Multi-element Piston Making Patents (Class 29/888.042)
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Patent number: 11492997Abstract: A piston for an internal combustion engine may include a ring belt, a groove, and an additional groove. The ring belt may extend along an axial direction. The groove may be arranged on the outer circumference of the ring belt and may be configured to receive an oil scraper ring. The additional groove may be arranged on the outer circumference spaced apart from the groove with respect to the axial direction. The additional groove may include a first groove side axially facing away from the groove and a second groove side axially facing the groove. The first groove side may include an axial step.Type: GrantFiled: July 16, 2021Date of Patent: November 8, 2022Inventors: Ulrich Bischofberger, Ralf Braig, Kai Schreer, Ioan Stefan
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Patent number: 11098800Abstract: A piston, in particular, a gallery-cooled piston for an internal combustion engine has a piston bottom part and a piston upper part which are connected in a joining process to produce the piston. The piston upper part has at least one ring zone and an inner wall. The piston bottom part has a radially circumferential oblique surface at the end which faces the piston upper part. The oblique surface, interacting with the inner wall of the piston upper part, brings about a centering action during the joining process of the piston parts. A joining method for manufacturing a piston is also disclosed.Type: GrantFiled: November 3, 2017Date of Patent: August 24, 2021Assignee: KS Kolbenschmidt GmbHInventors: Eberhard Weiss, Emmerich Ottliczky
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Patent number: 10527028Abstract: A piston is cylindrical and includes: a concave spherical portion formed at one of end portions of the piston and having a partially spherical shape; a cylindrical hollow portion formed at the other end portion of the piston; and an oil passage formed between the concave spherical portion and the hollow portion, the concave spherical portion and the hollow portion communicating with each other through the oil passage. The concave spherical portion includes a concave spherical surface formed by forging and having a partially spherical shape. A convex spherical portion of a shoe is supported by the concave spherical surface so as to be slidable and rotatable. An area of contact between the concave spherical surface and a predetermined master ball corresponding to the convex spherical portion is 40% or more of an entire area of the concave spherical surface.Type: GrantFiled: May 2, 2016Date of Patent: January 7, 2020Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Hideki Tamashima, Koji Matsuhisa, Kazuhiro Ishihara, Katsuyuki Kawashima
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Patent number: 10265811Abstract: A method for producing a piston for an internal combustion engine may include the steps of: producing a piston upper part from a first blank via a deformation process; producing a piston lower part from a second blank via at least one of a deformation process and a casting process; connecting the first blank of the piston upper part and the second blank of the piston lower part to form a piston body via a welding process; and performing at least one of a secondary machining process and a finish machining process of the piston body to produce the piston.Type: GrantFiled: March 18, 2014Date of Patent: April 23, 2019Assignee: Mahle International GmbHInventors: Gerhard Berr, Sascha-Oliver Boczek, Reiner Mueller, Rainer Scharp
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Patent number: 10208702Abstract: A method for producing a piston may include forming a piston blank in a first forming tool such that the piston blank surrounds a ring carrier configured to receive a piston ring via positive engagement after producing the ring carrier by a sintering process. The piston blank, at least in a circumferential region disposed at a piston head, may be composed of a light metal alloy suitable for forging. The method may also include removing the piston blank from the first forming tool and placing the piston blank in a second forming tool, and inserting a holding-down tool into the second forming tool to hold the ring carrier down. The method may further include pressing a final forming punch into the second forming tool to deform the piston blank and form a piston.Type: GrantFiled: August 15, 2016Date of Patent: February 19, 2019Assignee: Mahle International GmbHInventors: Udo Rotmann, Armin Wenzel, Juergen Friedrich
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Patent number: 9243709Abstract: A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface.Type: GrantFiled: March 14, 2013Date of Patent: January 26, 2016Assignee: Mahle International GmbHInventors: Michael T. Lapp, Alex Antoc, Luiz Perrone, Dietmar Spindler
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Publication number: 20150101191Abstract: A method for the production of a piston made of steel, for an internal combustion engine, in which the upper piston part is produced using the forging method, and the lower piston part is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.Type: ApplicationFiled: December 19, 2014Publication date: April 16, 2015Applicant: MAHLE INTERNATIONAL GMBHInventors: Rainer SCHARP, Gerhard BERR, Sascha-Oliver BOCZEK, Reiner MUELLER
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Patent number: 8991046Abstract: The present invention relates to a method for producing a multi-part piston (10, 110) for an internal combustion engine, comprising the following method steps: producing an upper piston part (11) and a lower piston part (12), each having an inner support element (22, 26; 122, 126) having joining surfaces (24, 28; 124, 128) and an outer support element (23, 27; 123, 127) having joining surfaces (25, 29; 125, 129), applying a high-temperature solder material in the area of at least one joining surface (24, 28 or 25, 29; 124, 128 or 125, 129), assembling the upper piston part (11) and the lower piston part (12) to form a piston body by establishing a contact between the joining surfaces (24, 28 or 25, 29; 124, 128 or 125, 129), placing the piston body in a vacuum furnace and evacuating the vacuum furnace; heating the piston body at a pressure of at most 10?2 mbar to a soldering temperature of at most 1300° C.Type: GrantFiled: June 29, 2010Date of Patent: March 31, 2015Assignee: MAHLE International GmbHInventors: Joachim Schulz, Jochen Kortas
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Publication number: 20150075368Abstract: A piston may be provided which includes a first piston body portion having an end wall extending radially about a central axis along which the piston reciprocates. The piston may also include a second piston body portion having an end wall extending radially about a central axis along which the piston reciprocates. The first piston body portion and the second piston body portion are axially opposed. The piston may further include a first piston rod bore disposed in the first piston body portion extending along the central axis and a second piston rod bore disposed in the second piston body portion extending along the central axis. The piston may also include a circumferential opening disposed between the mating of the first piston body portion with the second piston body portion.Type: ApplicationFiled: September 16, 2013Publication date: March 19, 2015Applicant: Ariel CorporationInventor: Evan William KOONTZ
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Publication number: 20150075370Abstract: Provided is a piston push rod assembly which can prevent discomfort from being imparted during the operation of a brake pedal by a driver. A piston push rod assembly, wherein: a second piston is provided with a piston slide section which is housed in a cylinder and which slides relative to the cylinder, and a connection tube section which is connected to a push rod; the piston slide section is covered by metal plating; the connection tube section has a non-plated section; and the second piston and the push rod are connected by the caulking of the connection tube section when the push rod has been inserted inside the connection tube section.Type: ApplicationFiled: March 29, 2013Publication date: March 19, 2015Inventors: Kazuaki Murayama, Jiro Suzuki, Takaaki Ohnishi, Motoyasu Nakamura, Yoshiyuki Takamatsu, Kazuhiro Tagata
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Patent number: 8973548Abstract: A liquid cooled piston of an internal combustion engine includes a piston lower part and piston upper part which has a combustion chamber recess. These piston components are supported via joining lands which are spaced apart radially and together form a dividing plane, and are joined together with a material-to-material fit. In order to receive piston rings, the piston upper part has a ring area and includes an annular cooling channel which extends into the piston lower part and is connected to an inner cooling space via connecting channels. The cooling channel is adjoined by recesses which are oriented in the direction of a piston head, are configured as a blind hole and widen conically starting from the cooling channel as far as a recess bottom. The recess bottom can be of a pronounced undulating enlarged surface or a finely undulating configuration.Type: GrantFiled: February 2, 2011Date of Patent: March 10, 2015Assignee: KS Kolbenschmidt GmbHInventor: Olma Andreas
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Patent number: 8943687Abstract: A method for the production of a piston made of steel, for an internal combustion engine, in which the upper piston part is produced using the forging method, and the lower piston part is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.Type: GrantFiled: April 18, 2011Date of Patent: February 3, 2015Assignee: MAHLE International GmbHInventors: Rainer Scharp, Gerhard Berr, Sascha-Oliver Boczek, Reiner Mueller
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Publication number: 20150000129Abstract: A method for manufacturing a piston can prevent casting defects such as oxide inclusions or shrinkage cavities on the surface of a combustion chamber over a piston head after casting. The method includes casting a head top having a bowl by pouring a first molten metallic material into a first mold with a bonding portion of the head top to be formed at an upper portion in the first mold and a first riser on the bonding portion of the head top, casting the body by pouring a second molten metallic material into a second mold, with a bonding portion of the body to be formed at an upper portion in the second mold and a second riser on the bonding portion of the body, removing the risers from the head top and the body, and integrally bonding the head top and the body to form the piston.Type: ApplicationFiled: December 2, 2013Publication date: January 1, 2015Applicants: Kia Motors Corporation, Hyundai Motor CompanyInventor: Pil Sung JANG
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Publication number: 20140345454Abstract: A piston assembly and method of making the same are disclosed. An exemplary piston assembly may include a multi-piece skirt secured to a piston crown having a ring belt portion defining a cooling gallery. The crown may include one or more a struts extending away from the ring belt portion to define a wrist pin bore(s). The piston skirt assembly may include two separate portions that each have at least one skirt support securing the respective skirt portion to the strut. A cover plate may be provided that is secured between a radially inner surface of the ring belt portion of the crown and a radially outer surface of the strut, such that the cover plate defines in part the cooling gallery.Type: ApplicationFiled: November 14, 2012Publication date: November 27, 2014Inventor: Montgomery L. Wilder
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Publication number: 20140305401Abstract: A method for producing a piston for an internal combustion engine, which piston has at least one cooling channel and is produced from at least one upper part and one lower part. The cooling channel of the piston is formed of the upper part and the lower part where the upper part and the lower part of the piston are each produced by means of a forging process At least one rib-like element, in particular, at least one rib, is additionally forged during the forging of the upper part an area of the cooling channel and/or at least one rib-like element, in particular, at least one rib, is additionally forged during the forging of the lower part in an area of the cooling channel. Two alternative production methods and to a piston for an internal combustion engine are disclosed.Type: ApplicationFiled: September 14, 2012Publication date: October 16, 2014Applicant: KS KOLBENSCHMIDT GMBHInventors: Emmerich Ottliczky, Franz Ratzky
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Publication number: 20140299091Abstract: A monobloc piston body for an internal combustion engine is provided. The piston body includes a first piece which includes a pair of skirt portions and a pair of pin bosses and a second piece which includes a crown portion with an upper combustion surface and an at least partially enclosed oil gallery. The first and second pieces are joined together at a joint that is located on a side of the oil gallery opposite of the upper combustion surface. The firs piece is made through casting or forging, and the second piece is made through an additive manufacturing process, such as direct metal laser sintering.Type: ApplicationFiled: April 4, 2014Publication date: October 9, 2014Applicant: Federal-Mogul CorporationInventors: Carmo Ribeiro, Owen Lu, Thomas Egerer
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Publication number: 20140261284Abstract: A piston and method of construction are provided. The piston has a piston body with an insert forming at least a portion of an upper combustion surface. The piston body is constructed from a first material having a first thermal conductivity and the insert is constructed from a second material having a second thermal conductivity. The first thermal conductivity is less than the second thermal conductivity. The piston body has an upper crown and a pair of pin bosses depending from the upper crown with the pin bosses presenting pin bores aligned with one another along a pin bore axis. The upper crown includes a recess in which the insert is fixed.Type: ApplicationFiled: March 13, 2014Publication date: September 18, 2014Applicant: Federal Mogul CorporationInventors: Mark McMurray, Marc Brandt
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Patent number: 8800144Abstract: A piston includes a crown portion generally defining an axis and having a skirt connecting portion. The skirt connecting portion is defined, at least in part, by a first crown mating portion, a second crown mating portion positioned radially from the first crown mating portion, and a crown chamber surface extending between the first crown mating portion and the second crown mating portion. The piston also includes a skirt having a crown connecting portion. The crown connecting portion is defined, at least in part, by a first skirt mating portion, a second skirt mating portion, and a skirt chamber surface extending between the first skirt mating portion and the second skirt mating portion. The first crown mating portion is selectively coupled to the first skirt mating portion. The second crown mating portion may be selectively coupled to the second skirt mating portion to define a piston chamber.Type: GrantFiled: April 9, 2012Date of Patent: August 12, 2014Assignee: Mahle International GmbHInventors: Steve Walker, Philip Vaden
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Publication number: 20140214000Abstract: A device for moving a piston inside a cartridge having a cartridge body and the piston displaceable along a longitudinal axis of the cartridge body is presented. The device comprises a first portion having first coupler for coupling the cartridge body to the first portion such that in both directions of the longitudinal axis, a connection exists between the cartridge body and the first portion; and a second portion having second coupler for coupling the piston to the second portion such that in both directions of the longitudinal axis, a connection exists between the piston and the second portion. The first and second portions move relative to each other to effect at least a forward displacement of the piston coupled to the second portion inside the cartridge body coupled to the first portion along the longitudinal axis. The second coupler establishes and releases the connection with the piston.Type: ApplicationFiled: October 9, 2013Publication date: July 31, 2014Applicant: ROCHE DIAGNOSTICS INTERNATIONAL AGInventors: Franco Moia, Marcel Mueller, Maurice Ducret
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Piston for internal combustion engines, produced by means of a multi-orbital friction welding method
Patent number: 8789273Abstract: A method for producing a piston of an internal combustion engine, designed as a one-piece cooling channel piston. The piston includes an upper part and a lower part supported by corresponding circumferential joining bosses together forming a joining zone. In order to produce a bonded joint of the upper part and the lower part, the joining bosses are connected by means of multiorbital friction welding in the region of a rotationally symmetrical or rotationally asymmetrical joining zone.Type: GrantFiled: January 30, 2009Date of Patent: July 29, 2014Assignee: KS Kolbenschmidt GmbHInventors: Michael Albert Janssen, Gerhard Luz, Volker Gniesmer, Steffen Stork, Martin Weissert -
Publication number: 20140202404Abstract: A monobloc piston assembly for an internal combustion engine is provided. The piston assembly includes a piston body which extends along an axis and is formed of at least two pieces of material which are joined together at least one friction weld joint which extends continuously through an annular shape around the axis. One of the pieces has an upper surface with a combustion bowl having a rotationally asymmetrical shape around the axis formed therein. Another of the pieces has a dome-shaped receiving surface which is rotationally symmetrical around the axis for slidingly receiving a portion of a connecting rod.Type: ApplicationFiled: January 21, 2014Publication date: July 24, 2014Applicant: Federal-Mogul CorporationInventors: Michael Weinenger, Florin Muscas
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Publication number: 20140109877Abstract: A piston coupled to a crankshaft via pullrods presents challenges for coupling the piston to the crankshaft because the connections are provided outside the piston. A bridge is coupled to a piston skirt at the end of the piston away from the piston crown. The bridge structure includes: a central support structure, a first projection extending outwardly from the central support structure in a first radial direction, and a second projection extending outwardly from the central support structure in a second radial direction. The central support structure is substantially hollow with a series of internal braces to yield a lightweight piston.Type: ApplicationFiled: October 21, 2013Publication date: April 24, 2014Applicant: EcoMotors, Inc.Inventors: Peter Hofbauer, Steven Spurr, John Michael LaFata, II
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Patent number: 8635982Abstract: A method for producing a piston for an internal combustion engine, composed of first and second piston components, has the following steps: (a) providing a blank of the first piston component composed of a tempered or precipitation-hardened steel, having at least one joining surface, (b) providing a blank of the second piston component composed of a tempered or precipitation-hardened steel, having at least one joining surface, (c) tempering or precipitation-hardening the blanks, (d) friction-welding the joining surfaces of the blanks to produce a piston blank, with the formation of at least one friction-welding seam and a heat influence zone in the region of the at least one friction-welding seam, (e) annealing or low-stress annealing of the piston blank, thereby obtaining the heat influence zone(s), (f) re-machining and/or finishing the piston blank to produce a piston. A piston so produced is also provided.Type: GrantFiled: April 18, 2011Date of Patent: January 28, 2014Assignee: MAHLE International GmbHInventors: Rainer Scharp, Klaus Keller
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Patent number: 8631574Abstract: A method is provided for forming intake manifolds for an internal combustion engine and for fastening such manifolds to the engines. The method includes: molding a plurality of identical ones of the intake manifolds, each one of the intake manifolds being molded with at least one hollow projection extending outwardly from an outer surface of the manifold, each one of the projections being molded with a cap at the distal end to seal the distal end of the hollow projection; removing the cap at a selected one or ones of the projections while leaving the cap on unselected one or ones of the projections; fastening each one of the intake manifolds to a corresponding one of a plurality of internal combustion engines; and for each one of the fastened intake manifolds, attaching a hose or hoses to the distal end or ends of the selected one or ones of the plurality of projections.Type: GrantFiled: June 10, 2009Date of Patent: January 21, 2014Assignee: Ford Global Technologies, LLCInventor: John Carl Lohr
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Patent number: 8616114Abstract: A piston has a piston body extending along a central axis. The piston body has an upper crown portion and a lower crown portion. The upper crown portion has an upper combustion wall and an at least one annular upper rib depending from the upper combustion wall to a free end. The lower crown portion has at least one annular lower rib extending to a free end that is fixed to the at least one upper rib and an inner gallery floor extending radially inwardly relative to the at least one lower rib. The upper crown portion has an upper post depending from the upper combustion wall along the central axis to a free end. The lower crown portion has a lower post extending upwardly from the inner gallery floor along the central axis to a free end. Together, the upper post and the lower post form a labyrinth passage.Type: GrantFiled: February 26, 2010Date of Patent: December 31, 2013Assignee: Federal-Mogul CorporationInventor: Carmo Ribeiro
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Patent number: 8613137Abstract: Exemplary connecting rods and methods of making a connecting rod are disclosed. A method of making a connecting rod may include the step of providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end. The method may further include forming a crankshaft pin recess in the crankshaft end of the connecting rod blank and a piston pin recess in the piston pin end, and forming at least one lubrication recess in the piston pin end of the connecting rod blank. The lubrication recess and the piston pin recess may both formed concurrently.Type: GrantFiled: December 10, 2012Date of Patent: December 24, 2013Assignee: Mahle International GmbHInventors: Michael T. Lapp, Dan Dinu, Roger A. Krause, Alan Stephen McEwan
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Patent number: 8601687Abstract: A multiplex fluid pump assembled from a plurality of pump bodies connected side by side between opposing end plates with a plurality of fasteners tightened to compress the pump bodies between the end plates. Raised surfaces on opposite exterior side surfaces of each pump body are engaged with an adjacent end plate or an adjacent pump body to apply a pre-compressive force at the raised surfaces and thereby inhibit the initiation of fatigue cracks.Type: GrantFiled: July 21, 2010Date of Patent: December 10, 2013Assignee: Schlumberger Technology CorporationInventors: Brian Ochoa, Philippe Gambier, Aude Faugere, Christopher Shen, Joe Hubenschmidt, Tze Wei Chua, Walter Taylor
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Publication number: 20130305919Abstract: The invention relates to a valve component, in particular for a piston or a valve, comprising at least one first disk-shaped joining part and at least one second disk-shaped joining part, wherein the first and second joining part each have at least one opening, and wherein once the joining parts have been joined, the opening in the joining parts interacts in such a way that a channel is formed and a fluid medium can flow through the channel. In first and second regions at the joining parts, an at least partially peripheral elevation and/or depression interact with one another in sealing fashion once joined.Type: ApplicationFiled: May 6, 2013Publication date: November 21, 2013Inventors: Sascha Frey, Rainer Gruber
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Patent number: 8528206Abstract: A method for the production of a piston (1) made of steel, for an internal combustion engine, in which the upper piston part (3) is produced using the forging method, and the lower piston part (4) is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of semi-hot forming, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.Type: GrantFiled: April 18, 2011Date of Patent: September 10, 2013Assignee: MAHLE International GmbHInventors: Rainer Scharp, Gerhard Berr, Sascha-Oliver Boczek, Reiner Mueller
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Patent number: 8522432Abstract: A method for manufacturing radial pistons for a hydraulic motor by machining cylindrical transverse holes at regular intervals in a bar, and, in order to form two adjacent pistons, cutting up the bar on a transverse cutting-up plane passing through one of said holes so that a first portion of said hole forms a cradle-shaped recess in the base of the first one of the two adjacent pistons and so that another portion of said hole forms a cradle-shaped recess in the top of the second one of the two adjacent pistons.Type: GrantFiled: December 8, 2011Date of Patent: September 3, 2013Assignee: Poclain Hydraulics IndustrieInventors: Gilles Lemaire, Alain Noel
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Patent number: 8327537Abstract: A method of friction welding a piston includes forming a piston body by friction welding an upper crown portion to a lower crown portion. At least one of the upper or lower crown portions is provided with a central support post extending along a central axis. The upper and lower crown portions have annular ribs radially outwardly from the central support post, with the ribs being aligned with one another. The method includes initiating a friction weld joint between a free end of the central support post and a corresponding surface opposite the free end of the central support post. Then, after initiating the weld joint between the central support post and the opposite surface, the method continues by then initiating a friction weld joint between aligned free ends of the ribs. Then, the friction weld joints are completed.Type: GrantFiled: December 23, 2009Date of Patent: December 11, 2012Assignee: Federal Mogul CorporationInventor: Carmo Ribeiro
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Publication number: 20120260882Abstract: A one-piece piston including a combustion bowl which is cast to its final form and includes at least one irregularity spaced from a central axis. The piston is initially fabricated of an upper crown member and a lower crown member, which are joined together. The piston is then chucked into a machine tool, such as a CNC lathe, which locates either the piston's top surface or a portion of the combustion bowl and establishes its location as a datum plane. It is this datum plane which serves as a reference location for subsequent machining operations of the piston.Type: ApplicationFiled: April 13, 2012Publication date: October 18, 2012Inventors: Airton Martins, Carmo Ribeiro
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Publication number: 20120258007Abstract: A piston includes a crown portion generally defining an axis and having a skirt connecting portion. The skirt connecting portion is defined, at least in part, by a first crown mating portion, a second crown mating portion positioned radially from the first crown mating portion, and a crown chamber surface extending between the first crown mating portion and the second crown mating portion. The piston also includes a skirt having a crown connecting portion. The crown connecting portion is defined, at least in part, by a first skirt mating portion, a second skirt mating portion, and a skirt chamber surface extending between the first skirt mating portion and the second skirt mating portion. The first crown mating portion is selectively coupled to the first skirt mating portion. The second crown mating portion may be selectively coupled to the second skirt mating portion to define a piston chamber.Type: ApplicationFiled: April 9, 2012Publication date: October 11, 2012Inventors: Steve Walker, Philip Vaden
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Publication number: 20120222304Abstract: What is proposed is a method for the production of a piston (1) made of steel, for an internal combustion engine, in which the upper piston part (3) is produced using the forging method, and the lower piston part (4) is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of semi-hot forming, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.Type: ApplicationFiled: April 18, 2011Publication date: September 6, 2012Applicant: MAHLE International GmbHInventors: Rainer Scharp, Gerhard Berr, Sascha-Oliver Boczek, Reiner Mueller
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Publication number: 20120222645Abstract: The present invention relates to a piston (10, 110, 210) for an internal combustion engine, having a piston base body (11, 111, 211) and a piston ring element (12, 112, 212), whereby the piston base body (11, 111, 211) has at least an inner region (14) of a piston crown (13) as well as a piston skirt (16), which is provided with pin bosses (18) having pin bores (17), whereby the piston ring element (12, 112, 212) has at least an outer region (21) of a piston crown (13) having a circumferential top land (22), and a circumferential ring belt (23) provided with ring grooves (24). According to the invention, it is provided that piston base body (11, 111, 211) and piston ring element (12, 112, 212) are joined together by way of corresponding, conical joining surfaces (32, 33, 27, 28; 135, 136; 232, 233, 227, 228) configured on them. The present invention furthermore relates to a method for the production of such a piston.Type: ApplicationFiled: April 18, 2011Publication date: September 6, 2012Applicant: MAHLE International GmbHInventors: Helmut Edel, Andreas Seeger-Van Nie, Volker Weisse
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Publication number: 20120222305Abstract: What is proposed is a method for the production of a piston (1) made of steel, for an internal combustion engine, in which the upper piston part (3) is produced using the forging method, and the lower piston part (4) is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.Type: ApplicationFiled: April 18, 2011Publication date: September 6, 2012Applicant: MAHLE International GmbHInventors: Rainer Scharp, Gerhard Berr, Sascha-Oliver Boczek, Reiner Mueller
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Publication number: 20120222644Abstract: A piston for an internal combustion engine has a piston head, a piston skirt, and a circumferential recess configured between the piston head and the piston skirt. The piston has a piston base body and a piston ring element. The piston base body has a crown region of a combustion bowl and the piston skirt. The piston ring element has a piston crown, a wall region of the combustion bowl, a circumferential top land, and a circumferential ring belt with ring grooves. The piston ring element has a circumferential cooling channel between the wall region of the combustion bowl and the ring belt, closed with a closure element. The piston base body and the piston ring element have a circumferential joining seam in the region of the combustion bowl, by way of which seam they are non-releasably connected with one another.Type: ApplicationFiled: April 18, 2011Publication date: September 6, 2012Applicant: MAHLE International GmbHInventors: Karlheinz Bing, Michael T. Lapp, Rainer Scharp, Michael Ullrich
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Patent number: 8240039Abstract: A method is provided for producing a piston for an internal-combustion engine of the structure in which a piston body which is composed of a crown having a groove for fitting a piston ring into an outer circumference surface and a skirt in connection with the bottom of the crown is provided with an annular cavity for flowing cooling liquid on an inside of the groove, the method comprising the steps of: forming the crown and the skirt individually; forming an annular groove for the annular cavity in the inner bottom of the crown and an annular rib in connection with the open edge of the annular groove before the crown and the skirt are joined together; bending the rib toward the opening of the annular groove by application of pressure to close the opening of the annular groove to thereby form the annular cavity; and joining the crown and the skirt together.Type: GrantFiled: September 11, 2008Date of Patent: August 14, 2012Assignees: Riken Forge Co., Ltd, Art Metal Mfg. Co., Ltd.Inventors: Atsushi Kondoh, Osamu Tanaka, Shoji Kanai, Takaaki Komatsu
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Publication number: 20120145112Abstract: The present invention relates to a method for the production of a piston (10, 110) for an internal combustion engine, having a circumferential cooling channel (24), whereby a blank (11?, 111?) of a lower piston part (11, 111) is forged, and a blank (12?) of an upper piston part (12) is produced, the blanks (11?, 111?, 12?) are pre-machined and joined together to form a piston blank (10?, 110?), which is finished to produce a piston (10, 110). According to the invention, it is provided that at least one depression (25) or at least one recess (135), respectively, is formed into the blank (11?, 111?) of the lower piston part (11, 111) during the forging process, whereby in the finished piston (10, 110), the at least one depression (25) forms an opening (33) for a coolant inflow and/or a coolant outflow, or the at least one recess (135) forms an excavation groove (136) for a pin securing ring, respectively.Type: ApplicationFiled: April 18, 2011Publication date: June 14, 2012Applicant: MAHLE International GmbHInventor: Rainer Scharp
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Publication number: 20120131795Abstract: A multi-part piston for an internal combustion engine has an upper piston part having a piston crown, and a lower piston part. The lower piston part has pin boss supports and pin bosses connected with them and the upper piston part and the lower piston part each have an inner and an outer support element, which elements delimit an outer circumferential cooling channel. The inner support elements delimit a cavity that is open toward the pin bosses. The cavity has a separate cooling oil collector that has at least one cooling oil opening. The piston is produced by manufacturing the upper piston part and lower piston part, inserting the cooling oil collector into the upper piston part or lower piston part, and joining the upper and lower piston parts together by friction welding.Type: ApplicationFiled: February 9, 2012Publication date: May 31, 2012Applicant: MAHLE INTERNATIONAL GMBHInventors: Rainer SCHARP, Klaus KELLER, Volker WEISSE
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Patent number: 8176629Abstract: A method for screwing together two metal parts that are spaced apart from one another close to a screw connection element and elastically deformable relative to one another, and for the remainder lie against one another. In order to obtain a firm and secure screw connection, with little expenditure of torque, one of the metal parts is deformed, before the metal parts are screwed together, in such a manner that regions close to the screw connection element come close to one another, and the metal parts are then screwed together. A region of the one metal parts remains deformed after they have been screwed together, as a result of the screw connection element.Type: GrantFiled: April 18, 2008Date of Patent: May 15, 2012Assignee: MAHLE International GmbHInventor: Wolfgang Issler
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Publication number: 20120103298Abstract: The invention relates to a method for producing a piston for an internal combustion engine, wherein a section which in the finished piston has a cooling duct (14) and a piston ring groove is recessed at first, the later cooling duct is then covered, and finally material for accommodating the piston ring is applied, and which is characterized in that the later cooling duct is covered by a wire material which is provided in a length, greater than necessary for one single piston. A device for producing a piston for an internal combustion engine with an at first recessed section that in the finished piston has a cooling duct (14) and a piston ring groove, has a device for attaching a cover on the cooling duct and a device for providing wire material having a length greater than necessary for one single piston.Type: ApplicationFiled: March 9, 2010Publication date: May 3, 2012Inventors: Peter Godel, Marc-Manuel Matz, Wolfram Cromme, Klaus Lades, Frank Dornenburg
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Publication number: 20120037111Abstract: A method for producing a piston for an internal combustion engine, composed of first and second piston components, has the following steps: (a) providing a blank of the first piston component composed of a tempered or precipitation-hardened steel, having at least one joining surface, (b) providing a blank of the second piston component composed of a tempered or precipitation-hardened steel, having at least one joining surface, (c) tempering or precipitation-hardening the blanks, (d) friction-welding the joining surfaces of the blanks to produce a piston blank, with the formation of at least one friction-welding seam and a heat influence zone in the region of the at least one friction-welding seam, (e) annealing or low-stress annealing of the piston blank, thereby obtaining the heat influence zone(s), (f) re-machining and/or finishing the piston blank to produce a piston. A piston so produced is also provided.Type: ApplicationFiled: April 18, 2011Publication date: February 16, 2012Applicant: MAHLE International GmbHInventors: Rainer Scharp, Klaus Keller
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Patent number: 8104447Abstract: A method for producing a piston for internal combustion engines includes the following steps: a first part is pre-fabricated by hot forging and a recess which has an undercut is formed in the first part during pre-fabrication by forming on the first part a projection, to which projection a lateral force is applied to form the undercut; a second part is pre-fabricated by hot forging and a projection is formed on this second part whose dimensions are matched to the dimensions of the recess; the two parts are joined together so that the projection on one part engages in the recess in the other part; and a compressive force is applied to the two parts which is sufficiently large and so aligned that the material of the projection on one part flows into the recess in the other part and completely fills it to connect the parts by positive fit.Type: GrantFiled: September 25, 2007Date of Patent: January 31, 2012Assignee: ThyssenKrupp Metalurgica Campo Limpo Ltda.Inventors: Joao Lester Garcia, Heraldo Carlos Furquim
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Patent number: 8061029Abstract: A method for manufacturing a piston device, comprises the following steps. Processing a first raw material to form a piston with a top surface and a bottom surface. Processing a second raw material to have the diameter of said second raw material slightly larger than the diameter of said piston. Cutting the second raw material into a plural cylinders. Mounting the annular component on the top surface or the bottom surface through the convex portion. The durability and the life cycle of the piston device can be extended by mounting the annular component onto the piston.Type: GrantFiled: May 8, 2008Date of Patent: November 22, 2011Assignee: Unipoint Electric Mfg. Co., Ltd.Inventor: Cheng Feng Lin
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Patent number: 8042512Abstract: Proposed is a piston (1) for an internal combustion engine having a closed annular duct (4) which is arranged close to the piston head (5) and radially at the outside, which annular duct (4) has, at the piston head side, an annular opening (21) which, in section, has the shape of a trapezium with limbs which taper conically in the direction away from the piston head, and which is closed off by an annular closure element (3) which, in section, has the same trapezium shape as the opening (21), with the closure element (3) being fastened in the opening (21) by means of friction welding.Type: GrantFiled: June 8, 2007Date of Patent: October 25, 2011Assignee: MAHLE International GmbHInventor: Rainer Scharp
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Patent number: 8011095Abstract: The invention relates to a method for producing a piston for a combustion engine comprising a combustion recess, during which an annular fiber preform for reinforcing the edge of the combustion recess is firstly fastened inside the casting mold. Afterwards, a low-silicon aluminum/copper melt is introduced into the casting mold by which the fiber preform is infiltrated and molded into the recess edge within the scope of the casting process. The piston blank produced in this manner is then subsequently compacted by a high-temperature isostatic pressing before the piston is completed by means of a machining completion process. The flanks and the base areas of the second and third annular groove are coated by means of anodic oxidation, and the hub boreholes are smoothed and hardened by roller-burnishing. This results in a very high-quality and heavy-duty piston.Type: GrantFiled: November 23, 2005Date of Patent: September 6, 2011Assignee: MAHLE GmbHInventor: Wilfried Sander
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Publication number: 20110180032Abstract: An insulative piston or piston cap creates a highly thermally resistive path in the axial direction of the piston or piston cap toward a crank case of an engine. An insulative cylinder is configured to be positioned around the insulative piston and adjacent an insulative cylinder head, and to provide thermal resistance in the cylinder's axial direction. The insulated cylinder head is configured to resist heat flow in the axial direction away from the crank case. High temperature insulation surrounding these structures is configured to resist heat flow out of a combustion chamber of the engine. These insulative components, together, form the fully insulated combustion chamber.Type: ApplicationFiled: January 20, 2011Publication date: July 28, 2011Applicant: Firestar Engineering, LLCInventors: Gregory S. Mungas, Gregory H. Peters, Kenneth Doyle, Larry R. Buchanan, Jose T. Banzon, JR.
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Publication number: 20110167632Abstract: A device for machining and assembling a piston, comprising, a piston upper part; and a piston lower part; an upper work spindle and a lower work spindle, wherein the upper and lower work spindles are arranged coaxially to one another and are at least one of -actuated independently of one another and actuated together, such that one work spindle supports the piston upper part and the other work spindle supports the piston lower part; and a first and second tool carriage, wherein the tool carriages are actuated independently of one another, such that one tool carriage supports a tool for machining the piston upper part and the other tool carriage supports a tool for machining the piston lower part, wherein the device is configured such that both of the piston upper and lower parts are machined independently of one another, aligned with regard to one another, and joined to one another such that the piston parts remain clamped to the tool carriages in the interim.Type: ApplicationFiled: June 13, 2008Publication date: July 14, 2011Inventors: Achim Fedyna, Gottfried Schnaitmann
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Patent number: 7971355Abstract: A method for attaching a ring element to a piston for an internal combustion engine, in which the ring element is screwed onto the piston body by a thread applied to the radially outer surface of a part of the piston crown, a circumferential groove that is open towards the top is formed into the piston crown in the region of the thread, the groove is filled with solder material, the piston is heated until the solder material liquefies and flows between the thread channels of the thread and subsequently, the piston is cooled. As a result, a secure screw connection between the basic piston body and the ring element is obtained. Furthermore, the cooling channel is sealed with regard to the combustion gases, which stand under high pressure and act on the piston crown.Type: GrantFiled: December 9, 2008Date of Patent: July 5, 2011Assignee: MAHLE International GmbHInventor: Rainer Scharp