Inner Member Has Five Or More Teeth Patents (Class 418/171)
  • Patent number: 11927188
    Abstract: A gerotor device for a pump apparatus is disclosed. The gerotor device includes at least two gerotor stages that respectively include an inner rotor rotating during operation about an inner axis with teeth projecting radially outside, and an outer rotor rotating during operation about an outer axis radially offset relative to the inner axis with radially inner open tooth gaps, in which the teeth of the inner rotor engage. A rotor body rotating during operation about a rotor axis includes radially open tooth gaps of a first gerotor stage of the at least two gerotor stages and teeth projecting radially outside of a second gerotor stage of the at least two gerotor stages. The tooth gaps of the at least two gerotor stages are fluidically sealed at least one of against one another and relative to a surrounding area.
    Type: Grant
    Filed: March 8, 2023
    Date of Patent: March 12, 2024
    Assignee: Mahle International GmbH
    Inventors: Holger Conrad, Torsten Klein
  • Patent number: 11319811
    Abstract: An internal gear pump includes an outer rotor having internal teeth, an inner rotor rotatably disposed inside the outer rotor and having external teeth engaging with the internal teeth, and a pump housing. The pump housing includes: a holding recess rotatably holding the outer rotor and having a wall on which an outer peripheral face of the outer rotor is to slide; an inlet to take in a fluid into pump chambers defined between the inner rotor and the outer rotor; an outlet to discharge the fluid from the pump chambers; a case groove provided on the wall and to hold the fluid; and a joint groove provided on an upper land face defined between a trailing end of the inlet and a leading end of the outlet and on which the internal teeth and the external teeth are to slide.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: May 3, 2022
    Assignee: SUBARU CORPORATION
    Inventors: Hiroaki Higashioka, Yoshiaki Yuzawa, Kazuhiro Toen, Yuichi Suzuki, Takahiro Yamamoto, Takato Ogasawara
  • Patent number: 11286927
    Abstract: The pump device includes a motor portion that includes a shaft rotating about a central axis and a pump portion that is driven by a motor portion via the shaft. The pump portion includes a pump rotor that rotates along with the shaft and a pump housing that includes an accommodation portion that accommodates the pump rotor. The pump housing includes a pump body that includes a first bearing portion that supports the shaft and a pump cover with an accommodation portion disposed between the pump cover and the pump body. The pump cover includes a flow path through which oil is discharged and suctioned, and includes a second bearing portion that rotatably supports the shaft and that communicates with the flow path. An end portion of the shaft on one side in the axial direction is disposed at the second bearing portion or inside the flow path.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: March 29, 2022
    Assignee: NIDEC TOSOK CORPORATION
    Inventors: Takamitsu Eto, Yoshiyuki Kobayashi, Koji Higuchi, Yutaka Hashimoto
  • Patent number: 11162493
    Abstract: One example of a gerotor pump includes an inner rotor comprising multiple teeth, the inner rotor configured to rotate about a first longitudinal gerotor pump axis. The gerotor pump also includes a hollow outer rotor including an outer surface and an inner surface having substantially identical contours, the inner surface configured to engage with the multiple teeth and to rotate about a second longitudinal gerotor pump axis. The pump includes a pump housing within which the inner rotor and the outer rotor are disposed, wherein the outer surface of the outer rotor defines gaps between the pump housing and the outer rotor.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: November 2, 2021
    Assignee: Saudi Arabian Oil Company
    Inventors: Rafael Adolfo Lastra Melo, Jinjiang Xiao
  • Patent number: 11022116
    Abstract: Disclosed is a trochoid lubricant supply device that is configured to connect to a rotational shaft. A connector of the lubricant supply device is configured to reduce an oil leakage amount of lubricant, and is configured to insert to a lower portion of a rotational shaft. The connector includes: a rotator mounting member inserted into and fixed to the rotator of the lubricant supply device; a penetrating member that penetrates a fixer of the lubricant supply device; an enlarged diameter extending radially outwards from the penetrating member outside the fixer; and a rotational shaft mounting member extending axially in the diameter enlarged member and is fastened to the rotational shaft. Further, the lubricant supply device of the present disclosure can supply the oil regardless of a rotation direction of the rotational shaft by supplying the oil by a space pivoting about the rotational center of the rotator.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: June 1, 2021
    Assignee: LG Electronics Inc.
    Inventors: Young Hwan Kim, Seungwook Kim
  • Patent number: 10947848
    Abstract: A commutator/manifold assembly controls a flow of hydraulic fluid in a hydraulic fluid system. The assembly includes a commutator having an offset design including an inner portion eccentrically encompassed within an outer portion, and offset commutator porting to control the hydraulic flow. A manifold includes manifold ports having a straight configuration by which walls defining the manifold ports run substantially along a longitudinal axis through an entirety of the manifold. The commutator is configured to rotate to sequentially align the commutator porting with differing portions of the manifold ports to control the flow. The commutator porting includes inner ports and outer ports that are isolated from each other by a commutator seal. A commutator ring has a guiding surface that guides rotation of the commutator. The rotation of the commutator provides a timed flow through the manifold ports straight through the manifold and without any directional flow restriction.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: March 16, 2021
    Assignee: Parker-Hannifin Corporation
    Inventors: Jason Richardson, Taylor Johnson
  • Patent number: 10767645
    Abstract: A fuel pump includes: an outer gear having a plurality of inner teeth; an inner gear having a plurality of outer teeth and eccentrically meshing with the outer gear; and a pump housing that defines a cylindrical gear housing chamber housing the outer gear and the inner gear to be rotatable. The outer gear and the inner gear rotate, while expanding and contracting a volume of a plurality of pump chambers formed between the outer gear and the inner gear, to sequentially draw fuel into and discharge from the pump chamber. An inner circumference part of the pump housing has a radially-inside corner part opposing a radially-outside corner part of an outer circumference part of the outer gear, and the pump housing has an annular groove formed in an annular shape all around the radially-inside corner part.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: September 8, 2020
    Assignee: DENSO CORPORATION
    Inventors: Hiromi Sakai, Daiji Furuhashi
  • Patent number: 10584702
    Abstract: One example of a gerotor pump includes an inner rotor comprising multiple teeth, the inner rotor configured to rotate about a first longitudinal gerotor pump axis. The gerotor pump also includes a hollow outer rotor including an outer surface and an inner surface having substantially identical contours, the inner surface configured to engage with the multiple teeth and to rotate about a second longitudinal gerotor pump axis. The pump includes a pump housing within which the inner rotor and the outer rotor are disposed, wherein the outer surface of the outer rotor defines gaps between the pump housing and the outer rotor.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: March 10, 2020
    Assignee: Saudi Arabian Oil Company
    Inventors: Rafael Adolfo Lastra Melo, Jinjiang Xiao
  • Patent number: 10480507
    Abstract: A gerotor assembly is provided which includes a crankshaft, an inner drive gear, an outer driven gear and a housing defining an oil groove. The inner drive gear defines a plurality of inner gear teeth. The outer driven gear defines a plurality of outer gear teeth operatively configured to engage with the inner gear teeth. The outer drive gear may define a plurality of passageways to form a hydrodynamic film between the outer driven gear and the housing. Alternatively, a high pressure oil pump may feed oil into the oil groove in order to distribute a hydrodynamic film.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: November 19, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Sean M McGowan, Joel H Pike, John B Davis, Bryan K Pryor, Mark R Claywell, Jeremy T Demarest
  • Patent number: 10400765
    Abstract: The disclosure provides a gear pump rotor assembly that includes a rotor body, a rotor head having a plurality of gear teeth and being connected to the rotor body, at least one connector extending between the rotor body and the rotor head, at least one radial deformation control member that extends into at least one gear tooth of the rotor head and reduces the radial deformation of the rotor head relative to the rotor body when a change in temperature causes radial deformation of the rotor body and rotor head.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: September 3, 2019
    Assignee: PeopleFlo Manufacturing, Inc.
    Inventors: William R. Blankemeier, Jorge G. Murphy, Clark J. Shafer, Michael P. Thompson, Daniel T. Turner
  • Patent number: 10393077
    Abstract: A fuel pump includes: an outer gear; an inner gear that is meshed with the outer gear and includes a receiving hole; a rotatable shaft; a contact portion that is formed to be contactable with the receiving hole; and a pump housing that rotatably receives the outer gear and the inner gear and includes a first housing component and a second housing component, between which the inner gear is held in the axial direction. At least one of the receiving hole and the contact portion includes a tilt surface, which is tilted relative to the axis direction. When the rotatable shaft is rotated to a drive rotation side, the receiving hole contacts the contact portion through the tilt surface, so that the receiving hole is urged in a circumferential direction and is also urged toward the first housing component in the axial direction.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: August 27, 2019
    Assignee: DENSO CORPORATION
    Inventors: Daiji Furuhashi, Hiromi Sakai
  • Patent number: 10337512
    Abstract: An internal gear pump (100) comprises: a rotor/torque ring comprising an internally lobed (140) rotor (130) and a torque ring (120) extending beyond at least a first end (134) of the rotor; an externally lobed (160) idler (150) encircled by the rotor; a hollow shaft (190) supporting the idler; a pressure relief element (200) positioned to shift between a first condition and a second condition; and a spring (210) biasing the pressure relief element toward the first condition from the second condition. The torque ring has at least one pressure relief port (240A, 240B) positioned so that: in the first condition, the pressure relief element blocks a path from an interior volume (235) of the pump to the pressure relief port; and in the second condition, relative to the first condition the pressure relief element does not block the path.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: July 2, 2019
    Assignee: Carrier Corporation
    Inventors: Russell G. Lewis, James S. Brissenden
  • Patent number: 10280920
    Abstract: The invention relates to a pump (2) intended to pump an additive in an SCR system for a vehicle. The pump is configured to rotate in a first direction of rotation in order to convey additive stored in a tank towards an injector via an injection channel. The pump includes a chamber (23) which houses a gear system (22). The chamber (23) is in fluid communication with the tank and the injection channel via an inlet channel (24) and an outlet channel (25) respectively. The pump is such that the inlet channel and the outlet channel are arranged so that after draining the injection channel, the chamber collects and retains the additive.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: May 7, 2019
    Assignee: Plastic Omnium Advanced Innovation and Research
    Inventor: Stephane Leonard
  • Patent number: 10221851
    Abstract: A transverse internal gear pump 1 having a trochoid 4, in which an inner rotor 3 having a plurality of outer teeth is rotatably accommodated within an outer rotor 2 having a plurality of inner teeth, the inner rotor being rotatably accommodated within the outer rotor in an eccentric state and with the outer teeth and the inner teeth meshing, and in which an intake-side volume chamber for taking in a liquid and an ejection-side volume chamber for ejecting liquid taken into the intake-side volume chamber are formed between the inner teeth and the outer teeth; a liquid intake nozzle 9 extending in a non-perpendicular direction with respect to the trochoid rotation surfaces and having a distal end immersed in a liquid reservoir 18; a pump casing 5 in which a recessed portion 5a for accommodating the trochoid is formed; and a pump cover 6.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: March 5, 2019
    Assignee: NTN CORPORATION
    Inventors: Takuya Ishii, Kei Hattori
  • Patent number: 10215173
    Abstract: The motor comprises an internal rotor having an external lob; an external rotor outside the internal rotor and having an internal lob engaging the external lob; and an inlet port and an outlet port. An inner diameter of the inlet port is less than a diameter of a dedendum circle of the internal rotor, and an outer diameter of the inlet port is greater than a diameter of a dedendum circle of the external rotor. An inner diameter of the outlet port equals the diameter of the dedendum circle of the internal rotor. An outer diameter of the outlet port equals the diameter of the dedendum circle of the external rotor. The inner diameter of the inlet port is less than the inner diameter of the outlet port. The outer diameter of the inlet port is greater than the outer diameter of the outlet port.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: February 26, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Ho Eop Yoon
  • Patent number: 10215026
    Abstract: A pump module may include a pump rotor coupled to a rotating shaft of a motor, and a pump housing configured to accommodate the pump rotor. The pump housing includes a rotor accommodating part having an insertion groove formed therein to accommodate the pump rotor, and a cover connected with the rotor accommodating part and having a fluid sucking hole and a fluid discharging hole.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: February 26, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Ho Eop Yoon
  • Patent number: 10184471
    Abstract: Disclosed is a trochoid pump for transferring high-viscosity liquids under high pressure. The trochoid pump includes an idler coupled to an inner through-hole inside a housing to be rotated, a rotor inserted into an inside of the idler, and a shaft configured to rotate the rotor, wherein the idler is provided with an inner toothed groove, into which the rotor is inserted and which has a plurality of projecting teeth, and recessed grooves, which are recessed with a predetermined depth along an outer circumferential surface thereof in a circumferential direction. Unlike an existing gear pump or trochoid pump, the trochoid pump for transferring high-viscosity liquids can reduce a viscous friction force, and can reduce the driving power.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: January 22, 2019
    Assignee: SHINHANG CO., LTD.
    Inventors: Hee Kyun Kim, Boon Do Eom
  • Patent number: 10174757
    Abstract: In an oil pump, an inner rotor and an outer rotor rotate to discharge the oil through a discharge port. The discharge port has an outer extension portion located on a radially inner side with respect to a root circle of the outer rotor and on a radially outer side of a tip circle of the outer rotor and an inner extension portion located on the radially inner side with respect to the tip circle of the outer rotor and on the radially outer side with respect to a root circle of the inner rotor. An inter-tooth chamber facing a partitioning portion that partitions the suction port from the discharge port comes into communication with the outer extension portion and the inner extension portion. Then, a tip seal portion defining the inter-tooth chamber intersects an outer edge of an opening of the discharge port.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Masaaki Oowaki
  • Patent number: 10167866
    Abstract: A control ring for controlling the flow of a pressure medium in a displacement pump is provided. The control extends along a first rotational axis, and includes a first and a second axial surface. The first axial surface has an interface section provided with at least a first and a second opening, which first and second openings are arc shaped and are separated by a first and a second land. The first land is provided with a first tapered groove extending from the first opening into the first land, and having its broader edge in a direction of the first opening and its tip in a direction of the second opening. The first tapered groove extends into the first land such that an angular distance between the first and second openings over the first land is different at different radial distances.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: January 1, 2019
    Assignee: VOLVO CAR CORPORATION
    Inventors: Jonas Forssell, Christer Odenmarck
  • Patent number: 10138885
    Abstract: A gerotor pump includes an inner rotor comprising multiple teeth, the inner rotor configured to rotate about a first longitudinal gerotor pump axis. The gerotor pump also includes a hollow outer rotor including an outer surface and an inner surface having substantially identical contours, the inner surface configured to engage with the multiple teeth and to rotate about a second longitudinal gerotor pump axis. The pump includes a pump housing within which the inner rotor and the outer rotor are disposed, wherein the outer surface of the outer rotor defines gaps between the pump housing and the outer rotor.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: November 27, 2018
    Assignee: Saudi Arabian Oil Company
    Inventors: Chidirim Enoch Ejim, Rafael Adolfo Lastra Melo, Jinjiang Xiao
  • Patent number: 10119539
    Abstract: An internal-gear pump has a housing which has a first fluid port and a second fluid port. An inner rotor is mounted in the housing so as to be rotatable about an inner rotor axis and has an external toothing. An outer rotor is rotatable in the housing about an outer rotor axis and has an internal toothing which, to generate a pump action, engages with the external toothing of the inner rotor. The internal-gear pump furthermore has a ring element which is mounted movably in the housing so as to be pivotable between a first position and a second position. At least a third fluid port is formed on the housing. The third fluid port is arranged relative to the ring element such that, in the first position of the ring element, the third fluid port is connected to the second fluid port. In the second position, said third fluid port is separated from the second fluid port.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: November 6, 2018
    Assignee: GETRAG Getriebe—und Zahnradfabrik Hermann Hagen
    Inventors: Mark Schweiher, Thomas Hoffmeister, Sven Schuster, Holger Berg
  • Patent number: 10066620
    Abstract: This internal gear pump accommodates: a ring-shaped internally toothed gear provided with internal teeth, and an externally toothed gear provided with external teeth which internally mesh with the internal teeth of the internally toothed gear, said externally toothed gear being eccentrically disposed inside the internally toothed gear. The number of internal teeth is one greater than the number of external teeth. In any one of the external teeth and the internal teeth, a tooth tip section and a meshing section are formed by a curve having one continuous curvature. The curve is formed by an equation with which the maximum curvature is at the apex of the tooth tip, and the curvature gradually reduces towards the tooth bottom section.
    Type: Grant
    Filed: October 9, 2014
    Date of Patent: September 4, 2018
    Assignee: TOYOOKI KOGYO CO., LTD.
    Inventor: Noritaka Watanabe
  • Patent number: 10060430
    Abstract: An internal gear pump integrally provided with a plain bearing requiring fewer machining steps, allowing inexpensive manufacture, and offering a highly stable seizing property. The internal gear pump has a trochoid (4), in which an inner rotor (3) having a plurality of outer teeth is eccentrically and rotatably accommodated in an outer rotor (2) having a plurality of inner teeth, the outer teeth meshing with the inner teeth, and in which a suction-side chamber for suctioning liquid and a discharge-side chamber for discharging the liquid that has been suctioned into the suction-side chamber are formed between the inner teeth and outer teeth; a drive shaft (9) fixed to the inner rotor (3); a casing (5) in which is formed a recess (5a) for accommodating the trochoid (4); and a cover (6) for closing off the recess (5a) of the casing (5).
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: August 28, 2018
    Assignee: NTN CORPORATION
    Inventors: Takuya Ishii, Hajime Asada
  • Patent number: 10006458
    Abstract: The electric pump of the present application includes a motor unit including a stator, a rotor core disposed inside the stator and a shaft coupled to the rotor core; a pump unit including an internal rotor coupled to the shaft and having an external lob formed thereon and an external rotor disposed outside the internal rotor and having an internal lob formed to be engaged with the external lob; a housing unit including a motor housing including the motor unit and a pump housing connected to the motor housing and having a pump accommodating part, in which the pump unit is inserted, formed therein; and a cover unit coupled to the housing unit to cover the pump accommodating part.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: June 26, 2018
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Ho Eop Yoon
  • Patent number: 9869313
    Abstract: An oil pump is provided. The oil pump comprises: a shell; a rotor mounting part on the shell and having a rotor supporting structure; and a rotor mechanism disposed on the rotor mounting part. The shell has an inlet and an outlet and defines a low-pressure oil chamber and a high-pressure oil chamber. A partition wall is disposed between the low-pressure oil chamber and the high-pressure oil chamber for separating the low-pressure oil chamber and the high-pressure oil chamber. An engine cover comprising the oil pump and an engine comprising the engine cover are also provided.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: January 16, 2018
    Assignees: SHENZHEN BYD AUTO R&D COMPANY LIMTIED, BYD COMPANY LIMITED
    Inventors: Jing Liu, Junli Zheng, Haibin Li, Jinchen Lin
  • Patent number: 9841019
    Abstract: An inner gear includes an insertion hole, which extends through the inner gear in an axial direction, and a first balance groove, which is axially recessed at an axial end portion of the inner gear and is communicated with the insertion hole. First and second chamfered portions are formed in an inner peripheral edge of the inner gear, which is adjacent to the insertion hole. A joint member has a leg inserted into the insertion hole. An inserting direction of the leg into the insertion hole is defined as a first direction, and a direction, which is opposite from the first direction, is defined as a second direction. In a view taken in a direction perpendicular to the axial direction, at least a part of a first direction side end portion of the leg is axially placed between a first chamfered end plane and a first groove end plane.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: December 12, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hiromi Sakai, Daiji Furuhashi
  • Patent number: 9772009
    Abstract: A tensioner system may be replaced by selecting replacement components. Components such as a housing, roller arm, pulley, and index plate locating pin may be selected from a group of housings, roller arms, pulleys, and index plate locating pins, respectively. The selection of the components allows a user to assemble multiple variations of tensioner that are commercially available. The location of the index plate locating pin on the index plate allows for proper orientation of the tensioner in the vehicle in order to apply the proper tension to a belt. The selection of the components may be based on current tensioner model, or based on dimensions measured from the current tensioner.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: September 26, 2017
    Assignee: Kit Masters
    Inventors: Craig Swanson, Dale Scherman, Daniel Huwe
  • Patent number: 9689390
    Abstract: In at least some implementations, a fluid pump includes a drive shaft including at least one drive surface and a pumping element. The pumping element includes an opening in which a portion of the drive shaft is received so that the pumping element is driven for rotation by the drive shaft, and the opening is larger than the drive shaft to provide a clearance between the pumping element and at least part of the drive shaft. The pumping element also includes at least one engagement surface arranged to be engaged by the drive surface of the drive shaft when the drive shaft is rotated where one or both of the drive surface and the engagement surface are angled to provide a surface area of engagement between the drive surface and engagement surface that is at least 1% of the surface area of the drive surface.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: June 27, 2017
    Assignee: TI Group Automotive Systems, L.L.C.
    Inventors: Glenn A. Moss, Edward J. Talaski
  • Patent number: 9617991
    Abstract: Provided is a hollow rotor and method for making a hollow rotor for a gerotor system, the gerotor system including inner and outer rotors having interengaging lobed profiles. At least one of the inner or outer rotors comprises the hollow rotor, the hollow rotor including radially inner and outer walls radially spaced-apart in relation to a rotational axis of the rotor and walls extending between the radially inner and outer walls for closing axial ends of the hollow rotor. The radially inner and outer walls define therebetween a cavity, thus providing for a hollow or empty interior of the hollow rotor. At least one of the radially inner or outer walls forms a plurality of lobes circumferentially spaced-apart around the cavity.
    Type: Grant
    Filed: January 21, 2013
    Date of Patent: April 11, 2017
    Assignee: Parker-Hannifin Corporation
    Inventor: Richard T. Friedman
  • Patent number: 9581156
    Abstract: In a gear pump, an outer inner wall surface of a suction port which is located on a downstream side in a rotor rotation direction, that is, a first inner wall surface, is located inward of a bottom land between internal teeth of an outer rotor, and the suction port has a shallow portion extended inward from the first inner wall surface on the downstream side in the rotor rotation direction, and a deep portion that is formed so as to be continuous with the shallow portion and that is deeper than the shallow portion. Communication between an inter-tooth chamber and the suction port is cut off with the inter-tooth chamber facing only the shallow portion.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: February 28, 2017
    Assignee: AISIN AW CO., LTD.
    Inventors: Takahiro Torii, Kengo Nomura, Minoru Todo, Mikio Iwase, Koji Ota, Mitsuhiro Takeda, Naoki Okoshi, Takumi Uchida
  • Patent number: 9506466
    Abstract: In a gear pump, an outer rotor and an inner rotor are disposed in a rotor installation chamber defined by a pump body and a pump cover. A suction port groove and a discharge port groove are formed in at least one of the pump body and the pump cover. A narrowing portion is formed at a portion of a radially outer side wall portion of the suction port groove, the portion being close to a terminal end wall portion of the suction port groove. The narrowing portion narrows the groove width in the radial direction. A pressurizing region that pressurizes oil in the gear chamber is formed between the narrowing portion and the terminal end wall portion.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: November 29, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Tsuyoshi Ebihara, Teppei Morita, Katsuhisa Udo
  • Patent number: 9415797
    Abstract: The invention discloses an automobile active steering system with a cycloidal-pin wheel mechanism, and aims at overcoming the contraction between light steering effort and flexibility. The automobile active steering system comprises a steering hand wheel (47), a steering shaft (52), a steering transmission shaft (48), a cycloidal-pin wheel type transmission mechanism (49), a rotary hydraulic valve (50), and a steering box (51). The steering hand wheel (47) is connected with an upper end of the steering shaft (52) by use of a spline pair, a lower end of the steering shaft (52) is connected with an upper end of the steering transmission shaft (48) by use of a universal joint, a lower end of the steering transmission shaft (48) is connected with a right end of an input shaft (21) of the cycloidal-pin wheel type transmission mechanism (49) by use of a universal joint.
    Type: Grant
    Filed: May 25, 2015
    Date of Patent: August 16, 2016
    Assignee: Jilin University
    Inventors: Junnian Wang, Yishan Pan, Qingnian Wang
  • Patent number: 9404492
    Abstract: The invention relates to a micro pump, comprising an inner rotor arranged on a shaft and an outer rotor, which form a rotor unit including a delivery chamber for fluid, wherein the pump comprises a multi-functional bearing member for the shaft with improved lubrication, to a bearing member for a micro pump and to an operating method.
    Type: Grant
    Filed: June 15, 2012
    Date of Patent: August 2, 2016
    Assignee: HNP MIKROSYSTEME GMBH
    Inventors: Sven Reimann, Gerald Voegele, Thomas Weisener
  • Patent number: 9291163
    Abstract: A pump includes a second housing member in which a suction-side groove and a discharge-side groove are formed at a predetermined interval in a circumferential direction of a bottom of a pump chamber so as to be recessed in the bottom of the pump chamber. Fitting portions that are fitted to bosses are formed on an outer surface of the second housing member. A protruding portion, which overlaps with the bosses in a thickness direction, is formed so as to protrude from a surface of the housing on which the fitting portions are formed. A relief valve is provided in the protruding portion, and the relief valve discharges fluid from the discharge-side groove when pressure in the discharge-side groove is equal to or higher than predetermined pressure.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: March 22, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Junichi Miyaki, Takatoshi Sakata
  • Patent number: 9273687
    Abstract: In producing tooth shapes of two toothed rings of an annular gear machine, a starting geometry of a first toothed ring, at least one quality criterion of the annular gear machine, and a desired eccentricity between rotational axes of the two toothed rings are defined. A motion is performed with the starting geometry that performs a rotational motion about its rotational axis and a revolving motion about the rotational axis of the second toothed ring. The rotational and revolving motions are coupled so the rotational angle of the eccentricity equals the product of the rotational angle and tooth count of the first toothed ring. A tooth shape contour of the second toothed ring is generated by recording the path described by the envelope of the starting geometry. If the defined quality criterion is not met, the previously used starting geometry and/or the defined eccentricity is changed and steps are repeated.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: March 1, 2016
    Assignee: NIDEC GPM GMBH
    Inventor: Andreas Blechschmidt
  • Patent number: 9068456
    Abstract: A trochoidal gear pump or engine uses a coaxial hub with an outer and/or inner rotor and an associated rolling element bearing assembly that uses pre-loaded bearings to precisely set the rotational axis and/or the axial position of the rotor with which it is associated. This allows the fixed-gap clearance between the rotor surfaces and the housing or other rotor surfaces to be set at a distance that minimizes operating fluid shear forces and/or by-pass leakage and eliminates gear tooth wear thus preserving effective chamber to chamber sealing. The device is useful in handling gaseous and two-phase fluids in expansion/contracting fluid engines/compressors and can incorporate an output shaft for an integrated condensate pump for use with Rankine cycles. A vent from the housing cavity to a lower pressure input or output port regulates built-up fluid pressure in the housing, thereby optimizing the efficiency of the device by controlling bypass leakage.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: June 30, 2015
    Assignee: ENER-G-ROTORS, INC.
    Inventor: George A. Yarr
  • Patent number: 9039397
    Abstract: A rotor for an oil pump according to the present invention is a rotor that includes an inner rotor configured by teeth, each of which has a plurality of ellipses or circles, and an outer rotor that is disposed on the outside of the inner rotor and has one tooth more than the inner rotor, wherein, in a tooth of the inner rotor, a tooth top and a tooth root of a drive-side half-tooth region extending from the tooth top to the tooth root and a tooth top and a tooth root of a non-drive-side half-tooth region extending from the tooth top to the tooth root are each configured by a different ellipse or a circle. A circumferential axis along a circumferential direction of the ellipse or circle configuring the tooth top is longer in the non-drive-side half-tooth region than in the drive-side half-tooth region.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: May 26, 2015
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Kenichi Fujiki, Masato Izutsu, Takatoshi Watanabe
  • Patent number: 9004891
    Abstract: A pair of Northey rotors for a vacuum pump, in which each rotor comprises two opposing, substantially parallel faces, and a peripheral surface located between the opposing faces. In order to reduce damage caused by pumping a gas stream containing liquid or solid particulates, a plurality of grooves is located on the peripheral surface for accommodating the particulates.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: April 14, 2015
    Assignee: Edwards Limited
    Inventors: Neil Turner, Malcolm William Gray, Jack Raymond Tattersall
  • Patent number: 9004889
    Abstract: An internal gear pump includes an inner rotor having n teeth and an outer rotor having (n+1) teeth. A tooth profile of the inner rotor is an envelope of a group of locus circles (13) each having a diameter C and having a center on a trochoidal curve (T), the trochoidal curve being drawn along a locus of a fixation point, which is located distant from a center of a rolling circle (12) by e, when the rolling circle (12) rolls along a base circle (11) without sliding. A tooth profile of the outer rotor is an envelope of a group of tooth-profile curves of a formation inner rotor, the envelope being obtained by first drawing the formation inner rotor in which a diameter of the locus circle (13) is equal to C? determined from expression (C?t), revolving a center (OI) of the formation inner rotor by one lap along a circle (S) having a diameter (2e) and centered on a center (OO) of the outer rotor, and rotating the formation inner rotor 1/n times during the revolution.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: April 14, 2015
    Assignee: Sumitomo Electric Sintered Alloy Ltd.
    Inventors: Masato Uozumi, Toshiyuki Kosuge
  • Patent number: 8998597
    Abstract: Described herein is a device comprising: a chamber wall comprising outer and inner surfaces, wherein the inner surface encloses a lobed chamber with a plurality of lobes and the inner surface comprises segments of arcuate surfaces, each of the segments of arcuate surfaces being tangent with its immediate neighboring segments, and wherein the chamber wall further comprises channels connecting the outer surface and the inner surface of the chamber wall and/or channels through an end surface of the chamber wall; a lobed piston configured to translate along a circular path relative to the chamber wall, the outer surface of the piston and the inner surface of the chamber wall engaged during translation and forming a fluid-tight seal between some portions of the outer surface of the piston and the inner surface of the chamber wall such that enclosed spaces are formed between the piston and the chamber wall.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: April 7, 2015
    Inventor: Yaode Yang
  • Patent number: 8974207
    Abstract: This invention relates to a gear pump (1) for delivering a fluid, comprising an externally toothed gearwheel (3) rotatably mounted on a journal (4), and an internally toothed annular gear (2), the gearwheel and gear meshing so as to produce a delivery action, and arranged together with an electrically commutatable stator (7) inside a housing (5). The stator (7) extends concentrically around the annular gear (2) and cooperates with a magnetic ring (6) in order to generate an electromotive force and the magnetic ring (6) together with the annular gear (2) rotate in order to produce the delivery action. The annular gear (2) is mounted by means of a sliding bearing (25).
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: March 10, 2015
    Assignee: Robert Bosch GmbH
    Inventor: Stanislaw Bodzak
  • Patent number: 8956133
    Abstract: An oil pump includes a first spill passage formed on a side surface (60) of a pump chamber (58) to communicate a hydraulic pressure chamber (54) with a first high pressure discharge passage (68) when the entire hydraulic pressure chamber (54) is positioned between the first high pressure discharge passage (68) and a first low pressure discharge passage (70). Therefore, when the hydraulic pressure chamber (54) passes between the first high pressure discharge passage (68) and the first low pressure discharge passage (70), the hydraulic pressure inside the predetermined hydraulic pressure chamber (54) escapes to the first high pressure discharge passage (68) through a first spill passage (76), so a hydraulic pressure value inside the hydraulic pressure chamber (54) is maintained at the pressure value inside the first high pressure discharge passage (68).
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: February 17, 2015
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin AW Co., Ltd., JTEKT Corporation, Toyooki Kogyo Co., Ltd.
    Inventors: Yusuke Ogata, Yoshihiro Mizuno, Masashi Hattori, Masahiro Ito, Naoki Okoshi, Kenichi Mori, Masahiko Suzuki, Fumitake Suzuki, Hidenobu Yamaguchi, Haruhiko Shibata
  • Patent number: 8920148
    Abstract: An oil pump having an inner rotor with of external teeth; an outer rotor that is eccentrically provided and has internal teeth that mesh with the inner rotor external teeth, and an oil pump body that accommodates the outer and inner rotors. By rotationally driving the inner rotor to increase and decrease a space between the internal and the external teeth, an intake stroke suctions hydraulic oil from the oil pump body and a discharge stroke discharges the suctioned hydraulic oil to a discharge port formed in the oil pump body. Between the intake and discharge strokes, a confinement stroke cuts off the suctioned hydraulic oil and confines the suctioned hydraulic oil in the space, and a compression stroke reduces the space and compresses the confined hydraulic oil. Further, an interval is set between a finish end portion of the intake port of the oil pump body and a start end portion of the discharge port such that a rotation angle of the inner rotor during the compression stroke is 21 to 27 degrees.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: December 30, 2014
    Assignees: Aisin AW Co., Ltd., Toyooki Kogyo Co., Ltd.
    Inventors: Masateru Nakagawa, Nobukazu Ike, Takuro Iwase, Tomohiro Umemura, Noriyasu Ariga, Katsunori Ishikawa, Masashi Narita
  • Patent number: 8905735
    Abstract: According to one embodiment of the invention, an engine system comprises a housing, an outer gerotor, an inner gerotor, a tip inlet port, a face inlet port, and a tip outlet port. The housing has a first sidewall, a second sidewall, a first endwall, and a second endwall. The outer gerotor is at least partially disposed in the housing and at least partially defines an outer gerotor chamber. The inner gerotor is at least partially disposed within the outer gerotor chamber. The tip inlet port is formed in the first sidewall and allows fluid to enter the outer gerotor chamber. The face inlet port is formed in the first endwall and allows fluid to enter the outer gerotor chamber. The tip outlet port is formed in the second sidewall and allows fluid to exit the outer gerotor chamber.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: December 9, 2014
    Assignees: The Texas A&M University System, StarRotor Corportion
    Inventors: Mark T. Holtzapple, Andrew Rabroker, Michael Kyle Ross, Steven D. Atmur, Gary P. Noyes
  • Patent number: 8876504
    Abstract: An object is to meet the demands for increasing the number of teeth of a rotor in an internal gear pump while maintaining a theoretical discharge amount by using an equivalent body configuration so as to enhance the pump performance relating to discharge pulsation due to the increased number of teeth. In a pump rotor 1 formed by combining of an inner rotor (2) having N teeth and an outer rotor (3) having (N+1) teeth and disposing the rotors eccentrically relative to each other, the relational expression ?Dmax<1.7e·sin(?/180)/sin {?/(180·N)} is satisfied, ?Dmax being a maximum value of a working pitch diameter of the inner rotor (2) and the outer rotor (3), and a working position (G) of the inner rotor (2) and the outer rotor (3) is always located rearward of an eccentric axis (CL) in a rotating direction of the rotor.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: November 4, 2014
    Assignee: Sumitomo Electric Sintered Alloy, Ltd.
    Inventors: Masato Uozumi, Harumitsu Sasaki, Kentaro Yoshida
  • Patent number: 8870556
    Abstract: An oil pump is increased to inhibit noise generation and durability is also improved. The oil pump includes a pump body, an inner rotor having outer teeth, and an outer rotor having inner teeth. A maximum partition portion is formed between a trailing end side of an intake port and a leading end side of a discharge port in a rotor chamber of the pump body. Among cells constituted by the outer teeth of the inner rotor and the inner teeth of the outer rotor, a central cell positioned in the location of the maximum partition portion and adjacent cells positioned before and after the central cell in the direction of rotation are sealed by mutual contact of the outer teeth and the inner teeth. The outer teeth and the inner teeth constituting cells other than the central cell and adjacent cells are not in contact with each other.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: October 28, 2014
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Kenichi Fujiki, Masato Izutsu
  • Patent number: 8840385
    Abstract: A fluid pump includes a motor, an inner gear rotor and an outer gear rotor. The inner gear rotor is driven for rotation about an axis by the motor and has a plurality of outwardly extending teeth. The outer gear rotor has a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates. At least one of the inner gear rotor and the outer gear rotor is formed from a plastic material.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: September 23, 2014
    Assignee: TI Group Automotive Systems, L.L.C.
    Inventors: Wayne T. Lipinski, Joseph M. Ross
  • Patent number: 8807972
    Abstract: Housingless positive displacement pump assembly comprises one or more vane or gerotor type housingless positive displacement pump units, each comprising pump unit components. One or more retaining rods extend through axially aligned holes in a mounting flange at one end of the pump assembly and the pump unit components to hold the pump unit components in stacked relation to one another and connect the pump assembly to the mounting flange.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: August 19, 2014
    Assignee: Hydro-Aire Inc.
    Inventors: Michael A. Reighard, Daniel T. DePauw, David A. Sedlak
  • Patent number: 8753099
    Abstract: According to one embodiment of the invention, a gerotor apparatus includes a first gerotor, a second gerotor, and a synchronizing system operable to synchronize a rotation of the first gerotor with a rotation of the second gerotor. The synchronizing system includes a earn plate coupled to the first gerotor, wherein the cam plate includes a plurality of cams, and an alignment plate coupled to the second gerotor. The alignment plate includes at least one alignment member, wherein the plurality of cams and the at least one alignment member interact to synchronize a rotation of the first gerotor with a rotation of the second gerotor.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: June 17, 2014
    Assignees: The Texas A&M University System, Starrotor Corporation
    Inventors: Mark T. Holtzapple, George A. Rabroker, Michael K. Ross
  • Patent number: 8734140
    Abstract: A reversible gerotor pump for a machine having a drive shaft is provided, the pump including a housing, an offset ring, and an inner and outer gear. The offset ring is disposed in the housing and includes a tab extending radially from an outer periphery. The outer periphery of the offset ring defines a first axis in common with the axis of a drive shaft. The inner periphery of the offset ring defines a second axis that is slightly offset from the second axis. The axis of the outer gear moves relative to the axis of the inner gear to allow pumping action in both rotational directions using the same suction and line cavities for both directions.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: May 27, 2014
    Assignee: GM Global Technology Operations, LLC
    Inventors: Daryl A. Wilton, James M. Hart, John C. Schultz, David R. Staley