Load Responsive Tension Adjuster Or Shifter Patents (Class 474/109)
  • Patent number: 10690224
    Abstract: The tensioning pulley arrangement for a belt drive in an engine, is provided. In one example, the tensioning pulley arrangement includes a first tensioning pulley and a second tensioning pulley tensioning a belt with a spring force and a spring preload force generated by a first spring device coupled to the first and second tensioning pulleys. The tensioning pulley arrangement further includes an intensifying device that decreases belt tension during low belt load conditions and increases belt tension during high belt load conditions. In this way, friction losses during low belt loads may be reduced and belt slippage caused by high belt loads and/or dynamic shifts in belt loads may also be reduced.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: June 23, 2020
    Assignee: Ford Global Technologies, LLC
    Inventors: Joachim Hansen, Stefan Quiring, Moritz Klaus Springer
  • Patent number: 10683913
    Abstract: Provided is a tensioner which can ensure, with a simple structure, both the stability of the installation state of a check valve and the capacity of an oil storage chamber. A tensioner has a plunger, a housing, a check valve, and a coil spring. The plunger has a front-side plunger part having a pressing front end portion, and a rear-side plunger part disposed on the rear side of the front-side plunger part and having a valve movement restricting portion. The check valve is disposed on the rear side of the valve movement restricting portion. The coil spring is disposed so that one end thereof is in contact with a housing bottom portion and the other end thereof is in contact with the rear side of the check valve.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: June 16, 2020
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventors: Munehiro Maeda, Yuji Kurematsu, Osamu Yoshida, Yudai Takagi
  • Patent number: 10641364
    Abstract: A belt tensioner (1) for a belt drive for auxiliary units in an internal combustion engine, including a tensioner housing (2), a tensioner lever (3) and a plain bearing for radially mounting the tensioner lever (3) in the tensioner housing (2) in order to allow the tensioner lever (3) to pivot; a bearing partner associated with the tensioner lever (3) is in sliding contact with a second bearing partner associated with the tensioner housing (2). One of the two bearing partners is suspended in a radially elastic manner on the associated part that supports the bearing partner in a rotationally fixed manner.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: May 5, 2020
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Sascha Reuschel
  • Patent number: 10570996
    Abstract: To simplify a structure and reduce costs. A shoe for a chain guide or for a chain tensioner arm is constructed. Here, a shoe (3) has a chain sliding surface (30) on which a chain slides. A locking protrusion such as a clip, a tab or a hook for locking the shoe (3) to a tensioner arm main body (2) of a chain tensioner arm (1) is not provided on an end surface of the shoe (3) or on a surface on the rear side of the chain sliding surface (30). Furthermore, the shoe (3) has a uniform cross-sectional shape over the whole length and extends linearly in the longitudinal direction.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: February 25, 2020
    Assignee: BorgWarner Inc.
    Inventor: Hiroyuki Fukuyama
  • Patent number: 10508732
    Abstract: In a shift lever device, a first facing cavity and a second facing cavity of a lever, and a first facing hole and a second facing hole of a printed wiring board, respectively face each other when the lever is disposed in an “H” position. Thus, in a state in which the lever is disposed in the “H” position when the shift lever device is being assembled, the first facing cavity and the second facing cavity respectively face the first facing hole and the second facing hole, thereby enabling the accuracy of relative assembly positions of a magnet of the lever and detection elements of the printed wiring board to be increased, and enabling the detection accuracy of a shift position of the lever to be improved.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: December 17, 2019
    Assignee: KABUSHIKI KAISHA TOKAI-RIKA-DENKI-SEISAKUSHO
    Inventor: Kenji Nakanishi
  • Patent number: 10408312
    Abstract: The invention provides a simple-structured tensioner lever capable of suppressing deflection of a stopper member and allows smooth assembly of the tensioner lever into an engine. The tensioner lever includes a stopper member for locking a coil spring, this stopper member including: a stopper pin portion inserted into a pin hole; a stopper front side extension portion continuous with one end of the stopper pin portion and protruding toward a base front surface; a stopper rear side extension portion continuous with the other end of the stopper pin portion and protruding toward a base rear surface; a spring lock portion formed in the stopper rear side extension portion and making engagement with a spring support arm; and a stopper movement restricting portion making engagement with the spring support arm to restrict movement of the spring support arm in a direction away from the base rear surface.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: September 10, 2019
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventors: Kazushi Noro, Toyonaga Saitoh
  • Patent number: 10323730
    Abstract: Provided is a simple-structured tensioner that can reduce the processing and assembling workload. A tensioner 10 includes a plunger 20, a housing 30, a main spring 60, and a relief valve 40. The relief valve 40 includes a seat member 41, a valve member 42, and a relief spring 43. The plunger 20 includes an outward relief passage 23, and a bottom protrusion 22a protruding rearward integrally with and continuously from a plunger bottom 22. The relief spring 43 is disposed such that one end thereof is in contact with the valve member 42 while the other end is attached to the bottom protrusion 22a.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: June 18, 2019
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventors: Kohei Kunimatsu, Masanori Watanabe
  • Patent number: 10024401
    Abstract: An object of the present invention is to provide a chain tensioner that allows a necessary and sufficient amount of oil to be fed during restart following a long stoppage of oil feeding and that maintains a proper pressure, thus preventing possible noise and vibration. An oil storing chamber 123 is formed inside a plunger 120 and forward of a check valve 150 in a protruding direction of the plunger 120. A tensioner body 110 has an oil feeding hole 114 through which a cylindrical surface portion 113 of a plunger housing hole 111 communicates with an outside and a high-pressure discharge hole 115 through which a pressure oil chamber 101 in the plunger housing hole 111 communicates with the outside. A relief valve 160 that is opened under a high pressure is provided in the high-pressure discharge hole 115 and closer to the pressure oil chamber 101.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: July 17, 2018
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventor: Yuji Kurematsu
  • Patent number: 9885401
    Abstract: A chain guide includes a guide base pivotable about a fulcrum shaft. The fulcrum shaft is between a roller bearing located at an end portion of the guide base, which is closer to the fulcrum shaft, and the center of the guide base in the longitudinal direction of the guide base such that the roller bearing is outside of the fulcrum shaft.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: February 6, 2018
    Assignee: NTN CORPORATION
    Inventors: Akio Kato, Takahiro Yamashita, Hisataka Hasegawa
  • Patent number: 9879763
    Abstract: A chain guide includes a curved guide base extending along the direction in which a torque transmitting chain moves. The guide base includes, on its surface opposed to the chain, a rolling guide portion including a plurality of roller element bearings which are rotatable and configured to guide the chain while kept in rolling contact with the chain, and a sliding guide portion in the form of a curved surface. The rolling guide portion reduces a loss in torque transmission, while the sliding guide portion reduces flapping of the chain, thus reducing noise and vibrations of the chain.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: January 30, 2018
    Assignees: NTN CORPORATION, BORGWARNER MORSE SYSTEMS JAPAN K.K.
    Inventors: Akio Kato, Takahiro Yamashita, Hisataka Hasegawa, Shinji Tsuruta, Hiroyuki Fukuyama, Nobuhiro Mizuno
  • Patent number: 9850989
    Abstract: A compliant tensioner arm assembly including an arm, an elastically deformable body disposed on a surface of the arm, and a sliding surface disposed on the elastically deformable body is disclosed. The elastically deformable body allows the sliding surface to yield to a load condition of the sliding surface so that the sliding surface yields to the load condition.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: December 26, 2017
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Gregory Cowen, Ryan Duffy, Lucian Botez
  • Patent number: 9840881
    Abstract: An injector head used in coiled tubing systems including at least two opposed counter-rotating chain loops having a first end and a second end, the chain loops having a chain. The injector head further includes a fixed drive sprocket disposed at the first end of a chain loop and a floating sprocket disposed at the second end of the chain loop. In the injector head, there is a force applied to the floating bottom sprocket to maintain the chain loop at a desired chain tension. Additionally, the injector head includes a tension cylinder that automatically maintains the chain loop at the desired chain tension.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: December 12, 2017
    Assignee: STEWART & STEVENSON, LLC
    Inventor: Rodney Earl Lancaster
  • Patent number: 9790817
    Abstract: In an aspect, a tensioner for an endless drive member, comprising a shaft and base that are mountable to be stationary relative to an engine, a tensioner arm that is pivotable relative to the shaft about a tensioner arm axis, a pulley on the tensioner arm rotatable about a pulley axis that is offset from the tensioner arm axis, and that is engageable with an endless drive member, a tensioner spring that is positioned to urge the tensioner arm towards a free arm position, a damping element that engages the tensioner arm and that is engaged by a plurality of axially spaced segments of the tensioner spring.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: October 17, 2017
    Assignee: LITENS AUTOMOTIVE PARTNERSHIP
    Inventors: Marek Frankowski, Dino Farronato, Rares I. Comsa, Frank C. Schimpl
  • Patent number: 9788910
    Abstract: A tension mechanism for a robotically-controlled medical device measures the tension applied to an actuation tendon to provide feedback to a robotic controller. In one embodiment, the device comprises an elongated instrument, an elongated member, and a base. The elongated member is coupled to the distal end of the elongated instrument, configured to actuate the distal end of the elongated instrument in response to tension in the elongated member. The base is located at the proximal end of the elongated instrument, and comprises a first redirect surface that redirects the elongated member. The first redirect surface is coupled to a lever element that is configured to exert a reactive force on a sensor in response to tension in the elongated member.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: October 17, 2017
    Assignee: Auris Surgical Robotics, Inc.
    Inventor: Travis Schuh
  • Patent number: 9785151
    Abstract: A machine navigation system includes a monitoring mechanism for monitoring configuration of an implement movable between configurations relative to a frame such that a center of mass of the machine moves in response to the moving of the implement. A second monitoring mechanism monitors track speed in the machine. A location of an origin of the track speed varies based upon location of the center of mass. A control unit is coupled with the monitoring mechanisms and structured to determine a control term for compensating for movement of a reference location on the machine relative to the track speed origin. The control unit further calculates velocity based on the track speed and the compensatory control term.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: October 10, 2017
    Assignee: Caterpillar Inc.
    Inventors: Hong Chang, Nicholas Vogel
  • Patent number: 9777806
    Abstract: A tensioning system including a base and an arm pivotally coupled to the base, the arm having an engagement surface and being configured to pivot relative to the base about a pivot axis. The system further includes a biasing mechanism operatively coupled to the arm to bias the arm relative to the base, and a seal assembly sealingly positioned between the arm and the base. The seal assembly is coaxial with the pivot axis and configured to accommodate relative axial movement between the base and the arm and relative radial movement between the base and the arm while still maintaining a seal therebetween.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: October 3, 2017
    Assignee: Dayco IP Holdings, LLC
    Inventors: Kevin G. Dutil, Anthony E. Lannutti, James Kevin Lindstrom
  • Patent number: 9618096
    Abstract: A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: April 11, 2017
    Assignee: BorgWarner Inc.
    Inventors: George L. Markley, Simon Barrette, Dale N. Smith, Joseph P. Goodsell
  • Patent number: 9611920
    Abstract: A tensioner force assembly is provided for applying tension to an engine timing chain that changes the direction of the force acting on a chain tensioning arm such that the tensioner piston is oriented in parallel with the long axis of the crankshaft. The tensioner assembly includes a crankshaft sprocket attached to the crankshaft, a cam shaft sprocket attached to the cam shaft, and a timing chain engaging the sprockets. A timing chain tensioner is pivotally attached to the engine block. A chain tensioner mechanism is provided that takes up timing chain slack. The chain tensioner mechanism includes a pivotable force transfer mechanism, a cylinder body having a long axis parallel to the long axis of the crankshaft, and a reciprocating tensioner piston in the body and engaged with the transfer mechanism for moving the transfer mechanism to apply required tension to the timing chain through the timing chain tensioner.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: April 4, 2017
    Assignee: Ford Global Technologies, LLC
    Inventor: Thomas Suchecki
  • Patent number: 9554680
    Abstract: A cleaner head comprising a main body rotatably coupled to a neck, and a locking arrangement operable to permit rotation of the main body relative to the neck when the cleaner head is positioned on a surface and to prevent rotation of the body relative to the next when the cleaner head is lifted off a surface. The locking arrangement therefore stops the cleaner head from rotating undesirably when the cleaner head is lifted away from a cleaning surface.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: January 31, 2017
    Assignee: DYSON TECHNOLOGY LIMITED
    Inventors: India Shaw Elsdon, Simon Peter Cross, Timothy Nicholas Stickney
  • Patent number: 9453561
    Abstract: A spring, especially for use in a belt tensioning device, with a number of at least 1.25 and at a maximum 2.5 coils, which extend around a spring axis A8, wherein a first coil end 42 has an axial offset Va relative to a first coil region 48, arranged at an angle of 360° around the spring axis A8, and wherein a second coil end 49 has an radial offset Vr relative to a second coil region 50 arranged at an angle of 360° around the spring axis A8. A belt tensioning device and an assembly with such a belt tensioning device include such a spring.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: September 27, 2016
    Assignee: Muhr und Bender KG
    Inventors: Matthias Zacker, Joachim Jud, Simon Pfeifer, Manfred Jung
  • Patent number: 9447851
    Abstract: A power transmission system transmits power from an internal combustion engine to a first and a second auxiliary device through an endless transmitting member. Prior to issuing of an engine start request, the first auxiliary device is actuated to move a tensioner pulley to a given position to increase the degree of tension of the endless transmitting member. The actuation of the first auxiliary device as an engine starter upon the issuing of the engine start request, therefore, enables a drive shaft of the engine to be rotated immediately within a required time to crank the engine. This achieves a quick start of the engine and results in a decrease in amount of time between the issuing of the engine start request and the actual start of the engine.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: September 20, 2016
    Assignee: DENSO CORPORATION
    Inventors: Hitoshi Noguchi, Hiroshi Okada, Tomoaki Nakano, Yoshihiro Yamashita, Yousuke Yamamoto, Kazuhisa Hara, Toshihisa Nakajima, Kazuki Matsuo, Toshikazu Mori, Shuhei Oe, Hikaru Kokumai, Kiyoshi Iwade
  • Patent number: 9267579
    Abstract: A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: February 23, 2016
    Assignee: BorgWarner Inc.
    Inventors: George L. Markley, Simon Barrette, Dale N. Smith, Joseph P. Goodsell
  • Patent number: 9228642
    Abstract: To provide a chain tensioner that has a simple structure, is universally usable and capable of supplying sufficient and necessary oil when restarted after a long time after the stop of oil supply, and enables reduction of its length and size. Urging unit 140 provided in an oil pressure chamber 101 to be extendable and contractible urges a plunger 120 outward from a plunger bore 111 in a tensioner body 110 of the chain tensioner 100. A connection groove 122 is formed in the outer circumference of the plunger 120 to form a supply chamber 102. An oil reservoir chamber 123 is formed inside the plunger 120. A leak groove 125 is formed in the outer circumference of the plunger 120 on the side of the oil pressure chamber 101 such as to extend into the supply chamber 102.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: January 5, 2016
    Assignee: TSUBAKIMOTO CHAIN CO.
    Inventor: Yuji Kurematsu
  • Patent number: 9151366
    Abstract: In one aspect, the invention relates to a tensioner that is capable of precognitively anticipating when it is desirable to increase the tension in a belt or other endless drive element so as to prevent belt slip prior to events that would raise the risk of it.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: October 6, 2015
    Assignee: LITENS AUTOMOTIVE PARTNERSHIP
    Inventors: John R. Antchak, Gary J. Spicer, Warren Williams, Zbyslaw Staniewicz, Andrew M. Boyes, Gerald J. Hamers, Ron Farewell
  • Patent number: 9115788
    Abstract: In a ring-type tensioner, a resilient ring that cooperates with external grooves formed on a plunger to restrict retracting movement of the plunger in a tensioner housing, is formed with manipulation parts that extend through a cut-out portion in the housing and have bulged portions that are spaced by gaps from opposed walls of the cut-out portions. A rod-shaped tool inserted into one of the gaps cooperates with the bulged portion and the wall on opposite sides of the gap to expand the ring. The manipulation parts can be formed with tool-holding portions.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: August 25, 2015
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yuji Kurematsu, Osamu Yoshida
  • Patent number: 9080640
    Abstract: An apparatus (10) for imparting tension to multiple strands of an endless power transferring member loop (12) encircling a drive sprocket (14) and at least one driven sprocket (16a, 16b). Two tensioning arms (18a, 18b) are spaced apart and have guided movement relative to at least one fixed pin (26), and support inwardly facing shoes (20a, 20b) with power-transferring-member-sliding faces (22a, 22b). A link assembly (60) includes at least two link members (32a, 32b) pivotally connected to one another at respective first ends (40a, 40b). The connected first ends (40a, 40b) are constrained for limited movement along a fixed slot (36) extending generally along a centerline of the power transferring member loop (12) between the drive sprocket (14) and the driven sprockets (16a, 16b). The link members (32a, 32b) are pivotally connected individually to opposite ends of the two spaced apart tensioning arms (18a, 18b) at second locations (42a, 42b).
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: July 14, 2015
    Assignee: BorgWarner, Inc.
    Inventor: George L. Markley
  • Patent number: 9080641
    Abstract: In a tensioner having a housing and a plunger protruding in an advancing direction from a plunger-accommodating hole formed in the housing. The plunger has a cylindrical outer wall for sliding contact with the wall of the plunger-accommodating hole, and a tapered the rear end wall. A small clearance between the cylindrical outer wall of the plunger and the wall of the plunger-accommodating hole allows the plunger to become inclined by a small amount, which increases as the plunger advances. The angle of the taper at a boundary where the end wall meets the cylindrical outer wall is substantially equal to the maximum inclination of the plunger when the plunger is in its fully advanced condition.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: July 14, 2015
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yuji Kurematsu, Osamu Yoshida
  • Publication number: 20150126315
    Abstract: A tensioner for an engine accessory drive system includes a tensioner arm pivotally mounted for movement between a free arm position and a load stop position. The tensioner arm includes a pulley which engages a belt. A piston, disposed in a cylinder, is pivotally linked to the tensioner arm. A spring urges the tensioner arm towards the free arm position. A moveable load stop member, controlled by an actuator, projects into the cylinder. The load stop member abuts the piston to thereby arrest movement of the tensioner arm and define the load stop position. The actuator may drive the load stop member against the piston to move the tensioner arm towards the free arm position so as to increase belt tension.
    Type: Application
    Filed: March 15, 2013
    Publication date: May 7, 2015
    Inventors: Ron Farewell, Zbyslaw Staniewicz, Andrew M. Boyes
  • Patent number: 8968127
    Abstract: A tensioner having a simplified structure, using engaging teeth having increased strength and reduced backlash, constructed from a reduced number of parts, reduced in cost, and having increased design freedom. A tensioner comprises: a tubular member (1) having engaging teeth (1b) formed thereon; one or more engaging elements (2) having formed thereon engaging teeth (2a) engaging with the engaging teeth (1b); and a shaft member (3) provided inside the tubular member (1) and having an engaging-element receiving section (3c) or an engaging-element supporting section which receives the engaging elements (2) of the tubular member (1). Either the tubular member (1) or the shaft member (3) functions as an advancing member which is moved by urging force in an advancing and retracting manner.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: March 3, 2015
    Assignee: NHK Spring Co., Ltd.
    Inventors: Takao Kobayashi, Tanehira Amano, Ikuomi Takahashi, Takahiro Ito
  • Publication number: 20150057117
    Abstract: In one aspect the invention relates to a tensioner that is capable of precognitively anticipating when it is desirable to increase the tension in a belt or other endless drive element so as to prevent belt slip prior to events that would raise the risk of it.
    Type: Application
    Filed: May 14, 2012
    Publication date: February 26, 2015
    Applicant: LITENS AUTOMOTIVE PARTNERSHIP
    Inventors: John R. Antchak, Zbyslaw Stan Staniewicz, Andrew Malcolm Boyes
  • Patent number: 8899408
    Abstract: Aspects of the present invention generally provide tensioner for varying tension applied to a continuous drive member based on temperature changes. In one embodiment, a temperature compensating chain tensioner is provided. The temperature compensating chain tensioner includes a fixed support member, a first idler sprocket coupled to the fixed support member, a support arm having a proximal end pivotably coupled to the fixed support member, a second idler sprocket coupled to a distal end of the support arm, and a spring form coupled intermediate of the fixed support member and the support arm, wherein the spring form has a spring constant that increases with increasing temperature, which causes the distal end of the support arm to move relative to the fixed support member.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: December 2, 2014
    Assignee: Applied Materials, Inc.
    Inventor: Alexander S. Polyak
  • Patent number: 8888623
    Abstract: An auto-tensioner includes a plunger slidably inserted in a cylinder and having a closed front end protruding from the cylinder and an open rear end which is located in the cylinder. The plunger is formed with an internal thread on its inner periphery. A screw rod having an external thread formed on its outer periphery thereof and inserted in the plunger with its external thread in threaded engagement with the internal thread of the plunger. The screw rod has a rear end protruding from the open rear end of the plunger. A seat member is mounted in the cylinder and in abutment with the rear end of the screw rod. A return spring having one end thereof supported by the screw rod biases the plunger outwardly of the cylinder to press the closed front end of the plunger against a chain or a belt. An elastic member which is compressible in the axial direction of the cylinder supports the seat member.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: November 18, 2014
    Assignee: NTN Corporation
    Inventors: Seiji Sato, Satoshi Kitano
  • Patent number: 8777337
    Abstract: The present disclosure relates to a chain drive assembly for a work machine, in particular for a crawler-mounted crane or a crawler excavator, having a drive crawler track, at least one displaceably supported sprocket wheel, in particular a guide wheel or idler wheel, and at least one tensioning device to tension the crawler track, wherein at least one abutment is provided which bounds the displacement of the displaceably supported sprocket wheel. The present disclosure further relates to a work machine, in particular to a crawler-mounted crane or a crawler excavator, having such a chain drive assembly.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: July 15, 2014
    Assignee: Liebherr-Werk Nenzing GmbH
    Inventors: Peter Juen, Werner Haiden
  • Patent number: 8690717
    Abstract: A tensioning device for compensating for elongations of the traction mechanism, in particular a chain or a timing belt, of a power transmission drive, in particular on an internal combustion engine, having a tensioning mechanism, in particular a tensioning rail, a sliding shoe or tensioning arm having a tensioning roller. A tensioning element is disposed between a support surface on the tensioning mechanism and a support, in particular on the internal combustion engine, and the support surface on the tensioning mechanism is made of a material which has a high strength.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: April 8, 2014
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Rainer Fuhrmann, Thomas Ullein
  • Patent number: 8460140
    Abstract: A belt tensioner includes a support housing at least in part defining a spring cavity and an arm pivotally attached to the support housing. A spring is located in the spring cavity and is operatively connected to the arm and the support housing to bias the arm about a pivot axis toward an unloaded position relative to the support housing. A damping member includes a hub and deflectable, force-applying elements that are connected to and spaced apart about a periphery of the hub. The force-applying elements are biased toward a contact surface of the arm to apply a frictional force between the contact surface and the force-applying elements to impede rotation of the arm relative to the support housing.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: June 11, 2013
    Assignee: Dayco IP Holdings, LLC
    Inventors: Robert C. Joslyn, James G. Quintus, Randy C. Foster
  • Patent number: 8419575
    Abstract: A tensioner for a chain or similar power transmission medium comprises a spring-biased plunger having annular rack teeth with gradually sloping forward surfaces and steeper rearward surfaces. The teeth are engaged by radially movable balls received in inclined grooves in an axially movable annular ball seat disposed in an annular groove formed in the wall of a plunger-accommodating hole in a tensioner housing. The bottoms of the inclined grooves face a steep rearward surface of a rack tooth, and the annular ball seat is axially movable in the annular groove and biased in the plunger protruding direction by a spring that exerts a biasing force greater than the biasing force exerted on the plunger. The balls and the movable annular ball seat block retraction of the plunger on engine start-up, but permit retraction when excessive force is imparted to the plunger while the plunger is in a protruding condition.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: April 16, 2013
    Assignee: Tsubakimoto Chain Co.
    Inventors: Osamu Yoshida, Yuji Kurematsu, Atsushi Hayami
  • Patent number: 8413326
    Abstract: Disclosed is an assembling method for a timing system of an engine to wind a timing chain (30) around a sprocket (20) attached to a crankshaft (18) and a sprocket (24, 28) attached to a camshaft (22, 26).
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: April 9, 2013
    Assignee: Mazda Motor Corporation
    Inventors: Takeyoshi Iwagami, Akihiro Noda, Yuzou Uotani
  • Patent number: 8403783
    Abstract: A hydraulic tensioner includes an inlet portion which defines a pressurized fluid inlet. The hydraulic tensioner also includes a housing defining a chamber which is coupled to the inlet portion. A band check valve separates the pressurized fluid inlet from the chamber, and a piston slideably engages the housing. A method of manufacturing the hydraulic tensioner is also disclosed.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: March 26, 2013
    Assignee: BorgWarner Inc.
    Inventor: Mark M. Wigsten
  • Patent number: 8403782
    Abstract: A printing apparatus comprises a print head moving module comprising a mounting plate, a first wheel, a second wheel, an endless belt, a retaining member of the mounting plate to clamp with the second wheel; an adjusting device comprising a positioning member of the mounting plate, a driving member of the positioning member comprising an indicating block, a moveable member of the positioning member abutting the retaining member, the moveable member comprises a receiving portion having graduations; the indicating block is through the positioning member in the receiving portion; a resilient member in the receiving portion between the driving and the moveable members; wherein the driving member drives the moveable and the retaining members from a first to a second position, in the first position, the indicating block is away from a predetermined graduation; in the second position, resilient member deformed, the indicating block is at the predetermined graduation.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: March 26, 2013
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventor: Yu-Jen Tsao
  • Patent number: 8387244
    Abstract: The assembly method includes packaging of items for shipment and secures components of the assembly in a fashion and in the related position required for further assembly, as a unit, to an engine that is in the process of being assembled. The timed assembly arrives at the engine plant secured together such that it allows handling, at least in part, as a single component and with its parts arranged in the relative position required for proper timing and for securing to other components of the engine. The chain (44) is pinned between a tensioner pin (66) and the tensioner chain contacting surface (60) and between a guide pin (74) and the guide or snubber chain contacting surface (88). The tensioner is preferably pinned in a state of minimum extension.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: March 5, 2013
    Assignee: BorgWarner Inc.
    Inventor: George L. Markley
  • Patent number: 8376883
    Abstract: A power transmission device includes a tubular stabilizer which is arranged between a primary pulley and a secondary pulley, and through which a string portion of a power transmitting chain is passed so as to be movable relative to the stabilizer whereby movement of the power transmitting chain is restricted. The stabilizer is supported by the power transmitting chain and is moved in the traveling direction of the power transmitting chain as the power transmitting chain moves in the traveling direction, and a movement of the stabilizer of which the amount is larger than or equal to a predetermined amount is restricted by a restricting device.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: February 19, 2013
    Assignee: JTEKT Corporation
    Inventors: Yuya Inoue, Shinji Yamane, Yoshihisa Miura, Teruko Nagaoka
  • Patent number: 8371973
    Abstract: A chain tensioner includes a cylindrical cylinder having an open end and a bottom, a cylindrical plunger axially slidably inserted in the cylinder and having a bottom and an open end located in the cylinder, a screw rod mounted in the cylinder and having an external thread on an outer periphery thereof, wherein the plunger has a protrusion on an inner periphery thereof which is in threaded engagement with the external thread of the screw rod, and wherein the external thread has a pressure flank for receiving pressure when a force is applied that tends to push the plunger into the cylinder, and a clearance flank, the pressure flank having a larger flank angle than the clearance flank, whereby the external thread is serration-shaped, and a return spring mounted between the plunger and the screw rod and biasing the plunger in a direction to protrude from the cylinder, thereby pressing a chain with the plunger, wherein the protrusion extends only a limited arcuate range of the inner periphery of the plunger.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: February 12, 2013
    Assignee: NTN Corporation
    Inventors: Seiji Sato, Tasuku Furukawa
  • Patent number: 8337345
    Abstract: The high-performance sliding rack ratchet tensioner is inexpensively manufactured. A rack having rack teeth is slidingly received in a rack slot on the side of the piston. The rack slot is preferably open-ended on the end facing the tensioner arm. The rack and piston are both received in a piston bore in the tensioner body. The rack length is preferably shorter than the rack slot length to provide backlash. A pawl mounted in a pawl bore perpendicular to the rack bore engages the rack. The open-ended rack slot allows the rack to be inserted after the piston during assembly. The rack and pawl preferably have shark fin-shaped teeth. The pawl preferably has dummy teeth to ensure that the load is shared by the center teeth.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: December 25, 2012
    Assignee: BorgWarner Inc.
    Inventor: Anand Arun Barve
  • Patent number: 8337344
    Abstract: A tensioner for a belt drive, comprising: a base carrying a pin defining an axis; a tensioning arm, which can rotate about the pin and supports an idle pulley; and a damping element, which is constrained to a hinge point eccentric with respect to the axis and is carried by one between the base and the tensioning arm so as to co-operate with a friction surface carried by the other between the base and the tensioning arm. The belt tensioner further comprises a resilient element having a first end portion connected in a single point to the damping element and a second end portion connected to the other between the base and the tensioning arm to cause a rotation of the damping element about the hinge point against the friction surface.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: December 25, 2012
    Assignee: Dayco Europe S.R.L.
    Inventors: Maria Cesare Meano, Renzo Gozzano
  • Patent number: 8323135
    Abstract: The hollow plunger of a hydraulic tensioner for an engine timing chain protrudes from a tensioner housing in an oblique downward direction. An inner sleeve fixed to the housing slidably protrudes into the interior of the plunger, and has a ball check valve at its protruding end. Oil is supplied though the sleeve and the check valve to a high pressure oil chamber formed inside the plunger, and flows outward through a two-part leakage path formed by a gap between the sleeve and the interior of the plunger and a gap between the exterior of the plunger and an interior wall of a plunger-accommodating hole in the housing. Any air that enters the tensioner accumulates in a region surrounding the upper end of the sleeve, rather than in the high oil pressure chamber inside the plunger.
    Type: Grant
    Filed: January 2, 2008
    Date of Patent: December 4, 2012
    Assignee: Tsubakimoto Chain Co.
    Inventors: Tsutomu Namie, Hiroshi Hashimoto, Hiroyuki Miyake
  • Patent number: 8317643
    Abstract: A hydraulic tensioning system (1), which is used in traction mechanism drives, particularly chain drives of internal combustion engines, is provided. The tensioning system (1) includes a piston (3), which is designed in the shape of a crucible, subjected to a pressure by a pressure spring (8), guided in a linearly displaceable manner in a housing (2) and spring-loaded against a traction mechanism. Hydraulic fluid can flow out of a pressure chamber (5) depending on an actuating direction of the piston (3) via an overpressure valve (11) forming a damper and associated with the piston (3) or can enter via a one-way valve (7) of the housing (2) into the pressure chamber (5). The overpressure valve (11) encloses a valve plate (15) that is integrated in the piston (3), and a pressure spring (8) of the piston (3) surrounds an outside of the valve housing (12) of the overpressure valve (11).
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: November 27, 2012
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Dominik Hofmann, Roman Kern
  • Patent number: 8282520
    Abstract: In a chain tensioner, an expansible ring is disposed in an internal groove formed in the inner wall of a plunger-accommodating hole near an open end thereof. The ring cooperates with grooves formed on the plunger to exert a ratchet action. The relationship between the angles of the surfaces of the internal groove and the grooves on the plunger allows the plunger to protrude, restricts retraction of the plunger on start-up of a chain transmission, but allows retraction when chain tension becomes excessive. In one embodiment, in which the ring is a C-ring, the tensioner housing can be formed with external threads for mounting in a threaded hole on a timing chain cover or other engine part. In other embodiments, the ring can have externally protruding levers for manipulation of the ring.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: October 9, 2012
    Assignee: Tsubakimoto Chain Co.
    Inventors: Yuji Kurematsu, Atsushi Hayami
  • Patent number: 8277347
    Abstract: The present invention is directed to decrease the impact sound of the ratchet mechanism generated at the time of piston retraction. The tensioner includes a piston 3 slidable in the piston bore 2a of the housing 2 and an expandable circlip member 5 engageable with the engagement groove 3a of the piston 3. The piston bore 2a has a guide groove 20 formed therein that has front and rear stop surfaces 20a, 20b adapted to contact the circlip member 5. The engagement groove 3a is formed by a round seat portion S0 that the circlip member 5 is adapted to seat, a piston-retraction restricting portion S0S1 that is formed on the front side of the round scat portion S0 and a piston-advance permitting portion S0S2 that is formed on the front side of the round seat portion S0.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: October 2, 2012
    Assignee: BorgWarner Morse TEC Japan K.K.
    Inventors: Simon Barrette, Kazuyuki Miyake
  • Publication number: 20120244975
    Abstract: A ratchet mechanism of the ratchet tensioner comprises a toothed ratchet element slidable in a housing and movable in a sliding direction, a plunger movable in an advance/setback direction and having rack teeth engageable by the teeth of the ratchet element, and a ratchet-biasing spring for biasing the ratchet element so that its teeth engage the rack teeth. The rack teeth have stop surfaces facing in the setback direction and sliding surfaces facing the advancing direction. The sliding surfaces are curved surfaces bulging in the advancing direction and in the direction of disengagement of the ratchet element from the rack teeth, the bulge being in an area extending from an entry starting location to an entry ending location.
    Type: Application
    Filed: March 1, 2012
    Publication date: September 27, 2012
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Yuji Kurematsu, Kaori Mori, Munehiro Maeda, Osamu Yoshida
  • Patent number: 8267819
    Abstract: A tensioner having a backstop device which allows free rotation of the pivot arm in a first direction but controls rotation of the pivot arm in a second, opposite direction. The backstop device permits a predetermined, limited amount of free rotation in the second direction and thereafter, employs a braking device to prevent rotation in the second direction if the torque that acts on the pivot art is less than a predetermined threshold.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: September 18, 2012
    Assignee: Litens Automotive Partnership
    Inventors: Jorma J Lehtovaara, Jacek Stepniak, Marek Frankowski, Mats K Lipowski, Richard A Forrest