With Actuator Driven By Electrical Or Fluid Motor Patents (Class 474/18)
  • Patent number: 10359111
    Abstract: A device for controlling a gear ratio of a hydrostatic mechanical power-split transmission comprises an input switch (1) which, when rotated, produces a particular transmission characteristic and, at the same time, limits the maximum pressure. The selected position of the input switch (1) selects a particular maximum pressure curve from a large number of stored maximum pressure curves.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: July 23, 2019
    Assignee: ZF Friedrichshafen AG
    Inventors: Marcus Hiemer, Jürgen Legner
  • Patent number: 10267391
    Abstract: A continuously variable transmission (CVT comprises a shaft rotatable about an axis, and variator assembly, and an actuator mechanism. The variator assembly includes a pulley supported on the shaft and having a ramp surface, and an endless rotatable device frictionally engaged with the pulley. The ramp surface inclines in an axial direction along the axis toward the endless rotatable device. The CVT further comprises an actuator mechanism that includes a wedge component that has a wedge surface interfacing with the ramp surface, and a rotary piston operatively connected to the wedge component. The rotary piston defines a first fluid chamber pressurizable to apply a rotational force that provides relative motion between the ramp surface and the wedge surface resulting in a wedge force on the ramp surface and a clamping force of the endless rotatable device on the pulley.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: April 23, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Jian Yao, Chengwu Duan, Chunhao J. Lee, Derek F. Lahr
  • Patent number: 10175145
    Abstract: The invention relates to an online wheel run-out detecting device. The online wheel run-out detecting device includes a frame, a chassis, a lifting cylinder, supports, bearing bases, linear bearings, mounting plates, guide shafts, a lifting shaft, a servo motor, a synchronous pulley, a connecting plate, a synchronous belt, a synchronous pulley, a base, a connecting shaft, a servo motor, a shaft sleeve, a lower end cap, a connecting shaft, a shaft sleeve, and an oil cylinder. The online wheel run-out detecting device can meet requirements of online wheel run-out detection, meanwhile it has the characteristics of simple structure, convenience in manufacturing, stable performance and capability of meeting machining requirements on precision, and can meet requirements of automatic production.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: January 8, 2019
    Assignee: CITIC Dicastal CO., LTD
    Inventors: Weidong Liu, Jiandong Guo, Bowen Xue
  • Patent number: 10168237
    Abstract: A torque detector includes a torque cam, a pulse gear, a rotation pulse detection member, and a torque acquisition member. The torque cam is disposed on a rotating shaft and capable of moving in an axial direction of the rotating shaft according to torque input to the rotating shaft. The pulse gear includes a tooth formed on an outer circumferential surface of the torque cam. The rotation pulse detection member disposed so as to oppose the pulse gear is configured to detect the tooth of the pulse gear in rotation and to output a pulse train. The torque acquisition member is configured to acquire the torque from the pulse train. The tooth extends in the axial direction and a tooth thickness becomes continuously larger or smaller from a first side to a second side in the axial direction.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: January 1, 2019
    Assignee: SUBARU CORPORATION
    Inventor: Muneki Yoshikawa
  • Patent number: 10151390
    Abstract: A method and apparatus for controlling a continuously variable transmission (CVT) of a powertrain system includes determining a target clamping pressure and an actual clamping pressure, and determining a proportional correction term and an integral correction term based upon the target clamping pressure and the actual clamping pressure. An adapt correction term is determined based upon the target clamping pressure and a temperature of the CVT. A commanded clamping pressure for controlling the CVT is determined based upon the proportional correction term, the integral correction term and the adapt correction term. A pressure command is employed to drive an actuator of a moveable sheave of a pulley of a variator of the CVT based upon the commanded clamping pressure.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: December 11, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Joseph William Tatangelo, Paul G. Otanez, Zhen J. Zhang
  • Patent number: 10066728
    Abstract: A continuously variable transmission clutch sheave cover is a one-piece plastic member having a plurality of snap-fit fasteners located between an outer perimeter and a central opening. The snap-fit fasteners releasably engage features positioned on the face of an outer sheave of a driven clutch assembly.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: September 4, 2018
    Assignee: DEERE & COMPANY
    Inventor: Nathan Yolitz
  • Patent number: 10046750
    Abstract: A continuously variable transmission, a control system, and a method is provided for synchronizing a clutch application state change and a continuous upshift in a motor vehicle propulsion system having a continuously variable transmission (CVT). The control system and method are configured to determine whether a continuous upshift of the CVT is impending. The continuous upshift is defined as a pulley ratio change exceeding a predetermined threshold for a predetermined pulley ratio change period. If a continuous upshift is impending, the control system and method are configured to alter a clutch engagement state after a predetermined delay period to synchronize the change in clutch engagement state with an engine speed change.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: August 14, 2018
    Inventors: James L Abington, Christopher J Weingartz
  • Patent number: 10036312
    Abstract: An auxiliary machine-driving device has a first idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of a motor/generator roller and an engine roller, a second idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the engine roller and a rotating roller, and a third idler roller having an outer peripheral surface biased into contact with the outer peripheral surfaces of the rotating roller and the motor/generator roller. When the engine starts, the engine is started by transmitting the driving force of the motor/generator to the engine via the motor/generator roller, the first idler roller and the engine roller. After the engine starts, power is generated from the driving force of the engine being transmitted to the motor/generator via the engine roller, the second idler roller, the rotating roller, the third idler roller and the motor/generator roller.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: July 31, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shin Hashimoto, Takeshi Yamamoto, Kenshi Ushijima, Satoshi Nishii
  • Patent number: 9958062
    Abstract: A CVTECU includes a secondary-pressure control section and a line-pressure control section that performs a same-pressure control to equalize a line pressure and a secondary pressure with each other if a predetermined start condition is satisfied. The line-pressure control section realizes a same-pressure state between the line pressure and the secondary pressure by lowering the line pressure below a target secondary pressure, and then controls the line pressure such that an actual secondary pressure is brought to the target secondary pressure by hydraulic feedback control while maintaining the same-pressure state. The secondary-pressure control section includes a restriction section that restricts an accumulation of integral term of an integral action for a duration between a time point at which the actual secondary pressure starts to be pushed down and a time point at which the same-pressure state between the line pressure and the secondary pressure is realized.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: May 1, 2018
    Assignee: JATCO Ltd
    Inventors: Tomoaki Honma, Seiichiro Takahashi, Takahiro Kobayashi, Takashi Eguchi, Hisao Nobu, Kenji Sakakibara
  • Patent number: 9873423
    Abstract: In a hybrid vehicle including an engine, a motor driven by a battery output, and a continuously variable transmission, when acceleration is requested, an ECU executes feeling-of-acceleration producing control for gradually increasing an engine rotation speed from an initial value NEini lower than an optimum rotation speed. With the battery output, the ECU makes up for a shortfall of engine output caused by the feeling-of-acceleration producing control. When starting the feeling-of-acceleration producing control, the ECU calculates a basic initial value NEini_base lower than the optimum rotation speed, and calculates, based on an atmospheric pressure, a lower limit value NEmin that allows the battery output to be maintained to be equal to or lower than prescribed electric power. The ECU selects a larger one of basic initial value NEini_base and lower limit value NEmin as initial value NEini.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: January 23, 2018
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masayuki Baba, Yoshiaki Tsuruta
  • Patent number: 9777795
    Abstract: A transmission damper includes a first cover plate, a flange, a spring, and a shaft. The first cover plate includes a first spring window and is arranged for fixing to a sheave for a continuously variable transmission. The flange is rotatable relative to the first cover plate and includes a second spring window. The spring is disposed in the first and second spring windows. The shaft is fixed to an inner portion of the flange and arranged for connecting to an engine crankshaft. In an example embodiment, the shaft is fixed to the flange by welding. In an example embodiment, the sheave is rotatable relative to the shaft. In an example embodiment, the shaft includes an internal taper for connecting to the engine crankshaft. In an example embodiment, the flange includes a radially extending tab arranged for contacting a portion of the cover plate after a predetermined rotation.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: October 3, 2017
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Markus Steinberger, Eric Zaugg, Allen Pervo
  • Patent number: 9765884
    Abstract: A powertrain system including an internal combustion engine rotatably coupled to a variator of a continuously variable transmission (CVT) is described. A method for controlling the CVT includes determining an actual speed ratio, a desired speed ratio and a commanded speed ratio. A total speed ratio change rate is determined based upon the actual speed ratio, the desired speed ratio and the commanded speed ratio, and a commanded speed ratio trajectory is determined based upon the desired speed ratio and the commanded speed ratio. A ratio change coefficient and a force ratio factor are determined based upon the commanded speed ratio trajectory, and a shift force is determined based upon the total speed ratio change rate and the ratio change coefficient. A primary pulley force and a secondary pulley force for the CVT are controlled based upon the shift force and the force ratio factor.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: September 19, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Zhen J. Zhang, Paul G. Otanez, Shushan Bai
  • Patent number: 9739374
    Abstract: A hydraulic pressure supply apparatus for automatic transmission having a first and a second regulator valves 50, 52 that are installed in a first and a second oil passages 46, 48 that connect a hydraulic pump 44 for pumping and discharging hydraulic oil from a reservoir 42 and a plurality of hydraulic actuators and depressurize the hydraulic oil discharged from the pump to pressure required by the hydraulic actuators, a third and a fourth oil passages 56, 58 that convey discharged hydraulic oil to lubrication system 54 and an ejector 60 having a nozzle 60a connected to one of the third and fourth oil passages and an intake 60b connected to the reservoir 42 such that hydraulic oil merged at a diffuser 60c is conveyed to the lubrication system 54 through a fifth oil passage 62, hydraulic energy generated by the hydraulic pump can be effectively utilized in an automatic transmission having the hydraulic actuators and lubrication system.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: August 22, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Shigeru Kanehara, Atsushi Fujikawa
  • Patent number: 9689493
    Abstract: A hydraulic control system for a transmission is provided. The hydraulic control system provides a latching system to retain CVT clutch pressure and/or pulley pressure for one or more CVT torque transmitting mechanisms and/or CVT pulleys in a CVT transmission. Components of the hydraulic control system of the present disclosure may include blow off valves, such as ball check-valves, on the exhaust of the pulley control valves and the exhaust of the CVT clutch control valve(s), and a one-way valve, such as a supply ball check-valve, disposed adjacent to each of the fluid supply inlets of the pulley control valves and the fluid supply inlet of the CVT clutch control valve(s).
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: June 27, 2017
    Assignee: GM Global Technoloogy Operations LLC
    Inventor: Philip C. Lundberg
  • Patent number: 9651150
    Abstract: A continuously variable transmission control system for a vehicle has a continuously variable transmission device having a belt which is bridged over a driving pulley on a motive power source side and a driven pulley on a wheel side, and an electricity-driven actuator that moves a moveable sheave of at least one of the driving pulley and the driven pulley in the axial direction, to change a width between the moveable sheave and a fixed sheave, a control device that controls driving of the electricity-driven actuator, and an acceleration operation detection unit that detects an operation state of an acceleration operation unit. The control device moves the moveable sheave in the axial direction using the electricity-driven actuator so that a reduction ratio of the continuously variable transmission device is reduced as an amount of operation of the acceleration operation unit is increased at least in a predetermined operation amount range.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: May 16, 2017
    Assignee: KANZAKI KOKYUKOKI MFG. CO., LTD.
    Inventor: Hongkun Wang
  • Patent number: 9638318
    Abstract: There are provided a continuously variable transmission (CVT) in which a belt (7) is wound around a primary pulley (5) and a secondary pulley (6) to transmit power; a primary pulley rotational speed sensor (13) for detecting a rotational speed of the primary pulley (5); a vehicle stopped state determination means for determining whether a vehicle is in a stopped state; a belt slippage detection means for detecting belt slippage on the basis of a signal of the primary pulley rotational speed sensor (13); and a prohibition means for prohibiting detection of the belt slippage by the belt slippage detection means when a parking range or a neutral range is selected by a shift lever operation by a driver. In the vehicle stopped state during selection of the parking range or the neutral range, the rotational speed of the primary pulley (5) is not basically output, and the belt slippage does not occur.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: May 2, 2017
    Assignees: JATCO Ltd, NISSAN MOTOR CO., LTD.
    Inventors: Kiyofumi Sasaki, Youji Itou
  • Patent number: 9556953
    Abstract: A hydraulically actuated continuously variable transmission (1) with two pulleys (5, 6), a drive belt (4) in frictional contact with these pulleys (5, 6) and a control device that includes at least two pressure chambers (8, 9) that are both associated with one pulley (6) and that are arranged such that a clamping force (Fs) that is exerted on the drive belt (4) by that one pulley (6) during operation of the transmission 1 is determined by the difference between the two pressures (Pline, Pcomp) that are respectively exerted therein and that are respectively actively controlled by a respective pressure control valve (13; 40) of the control device.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: January 31, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventor: Francis Maria Antonius Van der Sluis
  • Patent number: 9534685
    Abstract: A control device includes: a clamping force determination unit that determines a clamping force Fs so that a transmission gear ratio R of a stepless transmission is a target transmission gear ratio; a correction unit that corrects the clamping force Fs determined by the clamping force determination unit, based on an oil temperature TO of a lubricant interposed between each of pulleys and a belt and the transmission gear ratio R; and a clamping force control unit that controls clamping of the pulleys and to be performed with the clamping force Fs corrected by the correction unit.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: January 3, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Toru Yagasaki, Ryohta Aoki, Ryo Katayama, Ukyo Ogata, Hideaki Aoyama, Yuichiro Takemori
  • Patent number: 9341255
    Abstract: Provided is a V-belt type continuously variable transmission constructed such as to accommodate in a transmission case a transmission mechanism including: a drive shaft connected to an engine flywheel and provided with a drive pulley; a driven shaft provided with a driven pulley; and a V-belt wound around between the drive pulley and the driven pulley, the V-belt type continuously variable transmission comprising: an air intake chamber for introducing cooling air to surroundings of the drive shaft; and a flywheel cover for covering at least a periphery of the flywheel located in the air intake chamber.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: May 17, 2016
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Seiji Itoo, Ayumi Hamada, Taisuke Morita, Jun Takagi
  • Patent number: 9222579
    Abstract: A belt-drive continuously variable transmission including a lock mechanism for locking a primary moveable sheave of a primary pulley in a highest transmission ratio position. The lock mechanism includes a fixed side axial groove extending on an outer circumferential surface of a primary fixed sheave shaft, a moveable side axial groove extending on an inner circumferential surface of a primary moveable sheave sleeve, an intervening member disposed between the axial grooves, an axial tapered groove formed as a part of at least one of the axial grooves which is disposed corresponding to a highest transmission ratio, and an intervening member displacement limiting member arranged to limit an amount of displacement of the intervening member relative to the primary fixed sheave shaft along the fixed side axial groove or the moveable side axial groove.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: December 29, 2015
    Assignees: JATCO LTD, NISSAN MOTOR CO., LTD.
    Inventor: Yoichi Tsuji
  • Patent number: 9199631
    Abstract: A coast stop vehicle for stopping a drive source during vehicle running includes a power transmission means arranged between the drive source and drive wheels, a coast stop control means for executing a coast stop control to stop the drive source when a coast stop condition for stopping the drive source holds during the vehicle running, an electrical oil pump for supplying oil to the power transmission means during the coast stop control, a slip detection means for detecting a slip in the power transmission means during the coast stop control, and an electrical oil pump control means for causing the electrical oil pump to discharge a second discharge pressure higher than a first discharge pressure set before the slip in the power transmission means occurs when the slip occurs in the power transmission means during the coast stop control.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: December 1, 2015
    Assignee: JATCO LTD
    Inventors: Keichi Tatewaki, Hideshi Wakayama, Naohiro Yamada
  • Patent number: 9033831
    Abstract: A belt-driven continuously variable transmission having a downsized torque cam assembly for creating forward thrust to push a movable sheave toward a fixed sheave. The belt-driven continuously variable transmission is adapted to output a torque while changing a speed ratio continuously by altering an effective diameter position of a driving belt.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 19, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takaho Kawakami, Tomoaki Yanagida, Shuji Moriyama, Takuro Morino
  • Patent number: 9010466
    Abstract: A continuously variable transmission for a vehicle comprises a primary pulley, a secondary pulley, and a belt entrained around both pulleys in an opposite manner between the fixed and movable sheaves thereof. One pulley carries a selectively deployable stop that may be placed into position to mechanically limit the range of motion between the fixed and movable sheaves. This establishes an actual maximum transmission ratio that is larger than the nominal minimum transmission ratio but smaller than the nominal maximum transmission ratio achievable by the transmission during normal operation thereof. When such a transmission is used on a utility vehicle attached to a substance dispensing applicator operatively driven by the vehicle's engine, the application rate stays substantially constant despite changes in engine speed when the user keeps the transmission upshifted to the actual maximum transmission ratio set by the position of the deployed stop.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: April 21, 2015
    Assignee: The Toro Company
    Inventors: Jamie R. Larson, Jeremy A. Fohrenkamm
  • Patent number: 8998755
    Abstract: A vehicle powertrain has an engine, a driving shaft having a passage defined therein, a driven shaft, a pump, a hydraulic fluid reservoir, and a CVT. A driving pulley of the CVT includes a fixed sheave and a movable sheave disposed on the driving shaft for rotation therewith, a spring biasing a movable sheave away from the fixed sheave, and a CVT chamber fluidly communicating with the passage of the driving shaft. The pump supplies hydraulic fluid from the reservoir to the passage in the driving shaft. The hydraulic fluid flows from the passage to the CVT chamber to create a hydraulic pressure in the CVT chamber. The hydraulic pressure in the CVT chamber biases the movable sheave toward the fixed sheave.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: April 7, 2015
    Assignee: Consortium de Recherche BRP—Universite de Sherbrooke S.E.N.C.
    Inventors: David Monfette, Eric Lafreniere, Roger Rioux, Daniel Duceppe
  • Patent number: 8894521
    Abstract: A power transmission device includes a belt-type continuously variable transmission; a first fluid pressure cylinder; a second fluid pressure cylinder; a pressure-adjustment and pressure-feed device; a fluid outflow/inflow device; and a control unit that controls the pressure-adjustment and pressure-feed device based on a fluid pressure that is obtained from a thrust that is required for the second pulley in accordance with a driving state and that, by controlling the pressure-adjustment and pressure-feed device in this manner, controls the fluid outflow/inflow device such that a gear ratio is varied within a permitted gear ratio range in accordance with the fluid pressure that is pressure-fed from the pressure-adjustment and pressure-feed device in conjunction with the pressure adjustment.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: November 25, 2014
    Assignees: Aisin AW Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazumichi Tsukuda, Syoichi Sayo, Ryoji Habuchi
  • Patent number: 8827850
    Abstract: When the vehicle is stationary, the gear ratio is shifted to a Low side by controlling the position of a shift actuator such that a shift control valve is controlled to a position in which a first oil pressure shifts toward a neutral position side by a predetermined amount from a maximum discharge side position and a controlling secondary pulley pressure control unit to increase a second oil pressure to a predetermined oil pressure.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: September 9, 2014
    Assignees: JATCO Ltd, Nissan Motor Co., Ltd.
    Inventors: Yoshihisa Kodama, Kazuya Okamoto, Hiroki Iwasa, Hiroyasu Tanaka
  • Patent number: 8798877
    Abstract: A control device of a continuously variable transmission for a vehicle has a pair of variable pulleys and a transmission belt, and the control device respectively controls input-side and output-side thrust forces of input-side and output-side variable pulleys to set an actual gear ratio to a target gear ratio, prevents a slip of the transmission belt, and determines a lowest-speed-side gear ratio. When it is determined that a detection value of a rotation speed for calculating the actual gear ratio does not reflect an actual rotation speed, target input-side and output-side thrust forces are set to be target thrust forces for maintaining the lowest-speed-side gear ratio and preventing the slip of the transmission belt, and based on whether the actual gear ratio is already the lowest-speed-side gear ratio, values of the input-side and output-side thrust forces are changed for obtaining the target thrust forces.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: August 5, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Atsushi Ayabe, Shinya Toyoda, Kunio Hattori
  • Patent number: 8753248
    Abstract: A vehicle and a method for controlling the vehicle are capable of preventing slip of a belt of a continuously variable transmission at an appropriate timing. A control unit included in the vehicle includes a state information obtaining unit that obtains information indicating a state of a torque damping mechanism provided on a torque transmission path between a second pulley of a continuously variable transmission and a drive wheel, and a clamping force changing processing unit that changes the clamping forces of the first pulley of the continuously variable transmission and the second pulley, based on the state of the torque damping mechanism.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: June 17, 2014
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Hideyuki Fujita
  • Patent number: 8738246
    Abstract: In an apparatus for controlling a CVT that transmits power of an engine to driven wheels with hydraulic clamping pressure supplied from a hydraulic mechanism to clamp the belt from laterally-sided pulleys, it is determined whether the ABS operation of the ABS mechanism (to reduce braking force to be applied to the driven wheels when the driven wheels are locked) is delayed, and set hydraulic clamping pressure is increased when the ABS operation is determined to be delayed, while the set clamping pressure is maintained as it is when the operation of the ABS mechanism is determined to be not delayed.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: May 27, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yuichiro Takemori, Yuzo Okubo, Masatoshi Noguchi
  • Patent number: 8600634
    Abstract: A method is provided for controlling a normal force in a frictional contact of a continuously variable transmission including an input pulley and an output pulley where between an endless transmission element is arranged that is held between and in frictional contact with two pulley discs of each respective pulley under the influence of a respective normal force, wherein, as part the control method, the normal force at one pulley is actively oscillated, wherein a resulting oscillation of one of, or a ratio or difference between both of, a rotational speed of the input pulley and a rotational speed of the output pulley is determined and wherein at least one normal force is controlled in dependency on a correlation between the active oscillation and the resulting oscillation. The method includes a calibration step wherein a phase difference between the active oscillation and the resulting oscillation is determined.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: December 3, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Francis Maria Antonius Van Der Sluid, Erik Van Der Noll, Antonius Adrianus Helena Maria Van Dongen, Robert Godefridus Matheus Verscheijden
  • Patent number: 8562463
    Abstract: A belt type continuously variable transmission that includes a primary pulley; a secondary pulley; a belt where the primary pulley and the secondary pulley are bound; a positioning hydraulic chamber that presses a primary movable sheave to a primary fixed sheave; a supply-side valve that permits working oil to be supplied from the outside to the positioning hydraulic chamber; and a discharge-side control valve that controls permission or prohibition of discharge of the working oil from the positioning hydraulic chamber to the outside. The discharge-side control valve prohibits discharge of the working oil from the positioning hydraulic chamber to the outside when a position of the primary movable sheave is kept constant in the axial direction with respect to the primary fixed sheave.
    Type: Grant
    Filed: April 17, 2006
    Date of Patent: October 22, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroyuki Shioiri, Hiroaki Kimura, Ryuji Ibaraki
  • Patent number: 8517871
    Abstract: In a vehicular belt-driven continuously variable transmission, belt squeezing force is inhibited from becoming excessive and a safety factor, with respect to belt slip, of belt squeezing force applied to a transmission belt (48) is reduced to a value that is less than or equal to 1.5 by reducing a pressure receiving area (SOUT) of an output side hydraulic cylinder (46c). As a result, a centrifugal hydraulic pressure canceller chamber on a secondary pulley side (46) can be eliminated thus simplifying the structure of the vehicular belt-driven continuously variable transmission, while belt squeezing force can be appropriately controlled.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: August 27, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yusuke Ogata, Yoshinobu Soga, Ryoji Habuchi, Hideki Yasue, Hirofumi Nakada
  • Patent number: 8460137
    Abstract: A belt-drive CVT includes a pair of pulleys, each of which has a stationary pulley and a movable pulley that moves toward or away from the stationary pulley in an axial direction of the pulley, a belt that is wound around the pair of pulleys and a rotation state detecting device for detecting rotation of the pulley. The rotation state detecting device has a tone wheel that rotates integrally with the pulley and a sensor that faces the tone wheel. The tone wheel has a cylinder portion that extends along a moving direction of the movable pulley. The cylinder portion is provided with a plurality of detection portions which are arranged at regular intervals in a circumferential direction throughout an entire circumference of the cylinder portion and which extend along the moving direction of the movable pulley.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: June 11, 2013
    Assignee: Jatco Ltd
    Inventors: Akira Kajigaya, Tomoo Kawagoshi, Takahiro Imai, Takuya Iwasawa, Daisuke Kawanishi
  • Patent number: 8414433
    Abstract: A continuously variable transmission is provided with i) a primary pulley that is formed by a driving-side fixed sheave that is fixed to a drive shaft, a driving-side movable sheave, and a driving-side cylinder member, and has a driving-side cylinder, ii) a secondary pulley that is formed by a driven-side fixed sheave that is fixed to a driven shaft, a driven-side movable sheave, and a driven-side cylinder member, and has a driven-side cylinder, and iii) a drive belt. The drive shaft has a drive shaft internal fluid passage for supplying hydraulic fluid to the driving-side cylinder. A driving-side communicating fluid passage that communicates the drive shaft internal fluid passage with the driving-side cylinder is formed between the driving-side cylinder member and the driving-side movable sheave.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: April 9, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masanori Kadokawa, Daisuke Kikukawa
  • Patent number: 8412636
    Abstract: A belt type continuously variable transmission includes a continuously variable shift mechanism having a primary pulley, a secondary pulley and a belt wound around the respective pulleys, a pulley thrust calculation unit that calculates a pulley thrust, which is used to bias the respective pulleys in a direction for reducing the pulley width, so as to include a predetermined margin, a hydraulic control unit that controls an oil pressure supplied to each of the pulleys on the basis of the calculated pulley thrust, and an upshift determination unit that determines whether or not an upshift, during which the speed ratio is reduced, is underway. The pulley thrust calculation unit sets the predetermined margin to be smaller when an upshift is determined to be underway than when an upshift is determined not to be underway.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: April 2, 2013
    Assignee: JATCO Ltd
    Inventor: Yoshiaki Katou
  • Patent number: 8403779
    Abstract: A belt type continuously variable transmission includes a primary shaft and a secondary shaft, wherein the primary shaft is supported on a case via a first rolling element bearing, and the secondary shaft is supported on the case via a second rolling element bearing, the case is formed with a bolt hole at each of an even number of locations in a region separate from a shaft center plane, which is a plane that passes through a shaft center of the primary shaft and a shaft center of the secondary shaft, and first and second stopper plates that each hold down outer races of the first and second rolling element bearings are fixed to the case by bolts mounted in the bolt holes.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: March 26, 2013
    Assignees: Aisin AW Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazumichi Tsukuda, Youichi Murata, Syoichi Sayo, Ryoji Habuchi
  • Patent number: 8360907
    Abstract: A hydraulic control system of continuously variable transmission includes: a first sheave pressure regulating valve (17) that regulates a line pressure (Pl), which is used for hydraulic control as a source pressure, to obtain a first sheave pressure (Pin); a fail-safe valve (19) that selects and outputs any one of the first sheave pressure (Pin) or a fail-safe hydraulic pressure (second sheave pressure Pout) that is applied to a drive pulley (21) at the time of a failure due to an excessive first sheave pressure (Pin) to the drive pulley (21); and an orifice (25) that is provided in an oil passage (24) between the fail-safe valve (19) and the drive pulley (21). Then, a hydraulic pressure in the oil passage (24) on the drive pulley (21) side of the orifice (25) is supplied to the first sheave pressure regulating valve (17) as a feedback pressure.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: January 29, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yusuke Ogata, Toshihiro Aoyama
  • Patent number: 8357063
    Abstract: A belt type continuously variable transmission for a vehicle such as a motorcycle includes a primary sheave and a secondary sheave each having a pair of flanges axially movable relative to each other. A belt is wound around the sheaves. An actuator controlled by a control device moves the flanges. The control device includes a determination section for determining whether the actual gear ratio of the belt type continuously variable transmission has become a predetermined gear ratio for TOP or LOW, and a first correction section for correcting an operation amount of the actuator based on the determination made by the determination section. Control accuracy in a region where the gear ratio is TOP or LOW is thereby improved.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: January 22, 2013
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Masaya Sakaue
  • Patent number: 8287409
    Abstract: A hydraulic control system of continuously variable transmission includes: a first sheave pressure regulating valve (17) that regulates a line pressure (Pl), which is used for hydraulic control as a source pressure, to obtain a first sheave pressure (Pin); a fail-safe valve (19) that selects and outputs any one of the first sheave pressure (Pin) or a fail-safe hydraulic pressure (second sheave pressure Pout) that is applied to a drive pulley (21) at the time of a failure due to an excessive first sheave pressure (Pin) to the drive pulley (21); and a first regulator valve (12) and a second regulator valve (13) that regulate the line pressure (Pl). An output pressure (Psf) of the fail-safe valve (19) is supplied to the first and second regulator valves (12 and 13) in a feedback manner as a drive pulley (21) side hydraulic pressure to thereby regulate the line pressure (Pl).
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: October 16, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yusuke Ogata, Toshihiro Aoyama
  • Publication number: 20120122628
    Abstract: Systems and methods for efficiently and effectively controlling the rate of change of ratio, not simply the ratio, in a CVT. By controlling the rate of change of ratio, the acceleration or deceleration of a vehicle can be controlled in an efficient manner. Furthermore, the rate of change of ratio can be controlled by controlling the clamping pressure of the pulleys and/or differential pressure between the pulleys with minimal slip by using a servo control mechanism adapted for control by a system controller based on equilibrium mapping and other control parameters.
    Type: Application
    Filed: November 15, 2011
    Publication date: May 17, 2012
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Andrew A. Frank, Thomas Dreumont
  • Patent number: 8165772
    Abstract: A method of managing slip in a transmission that is driven by a prime mover includes determining whether a slip condition of the transmission is present based on a slip value and reducing a torque output of the prime mover based on a torque reduction value when the slip condition is present. The method further includes storing the torque reduction value in an array if the slip condition is resolved as a result of the step of reducing and identifying a faulty component within the transmission based on the array.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: April 24, 2012
    Inventor: Todd J. Thor
  • Patent number: 8147363
    Abstract: A conical disk assembly including a shaft carrying an axially movable disk and having a fixed disk rigidly connected to the shaft. A support ring having first ramp surfaces facing the axially movable disk is carried on the shaft, and a rotatable sensing piston having second ramp surfaces that face the first ramp surfaces is axially movable along the shaft. Rolling elements are positioned between the ramp surfaces, and when the ramp surfaces are rotated relative to each other, the rolling elements move the sensing piston axially along the shaft. A guide ring is rigidly operatively connected to the axially movable disk and includes guide surfaces associated with the ramp surfaces for radially supporting the rolling elements. The guide ring and the support ring are connected with each other in a non-rotatable and axially movable manner to facilitate assembly of the conical disk assembly.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: April 3, 2012
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Bernhard Walter
  • Patent number: 8133141
    Abstract: The invention relates to a hydraulic system for actuating a continuously variable belt-driven conical-pulley transmission having two conical pulleys encircled by an endless torque-transmitting means, each of which comprises two conical disks, one of which is axially movable depending on the pressure in an associated pressing chamber, and having a torque sensor which includes a torque sensing chamber that is connected to a hydraulic energy source and is linked with the pressing chambers. The invention is distinguished by the fact that the pressing chambers are connected via a first hydraulic resistance element to the torque sensing chamber, and via a second hydraulic resistance element to an additional pressure chamber, in which a lower pressure prevails than in the pressing chambers and/or the torque sensing chamber.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: March 13, 2012
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Eugen Kremer, Eric Müller, Jochen Pfister, Reinhard Stehr, Ronald Glas
  • Patent number: 8133140
    Abstract: A control apparatus for an automatic transmission includes a control section having a target secondary pressure setting section configured to set a target secondary pressure within a strength limit of the belt, and an operation switching section configured to switch a shift operation from a normal speed to a high speed higher than the normal speed when a predetermined condition is satisfied. The control section is configured to control the secondary pressure regulating valve by a feedback control based on the target secondary pressure and the actual secondary pressure sensed by the hydraulic pressure sensor. The target secondary pressure setting section is configured to modify the target secondary pressure by adding a predetermined quantity when a correction initiation condition is satisfied, the condition initiation including a first condition that the shift operation is performed at a high speed by switching of the operation switching section.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: March 13, 2012
    Assignee: Jatco Ltd
    Inventors: Midori Yamaguchi, Yoshihisa Kodama, Toshiji Iida, Toshiyuki Shibuya, Tatsuya Ozone
  • Patent number: 8126621
    Abstract: In an engine load control device of a work vehicle, an output of an engine is transmitted to a hydraulic actuator via a variable displacement type hydraulic pump. A controller is configured to calculate, based on a target rotational speed of the engine detected by a target rotational speed detecting portion and an actual rotational speed of the engine detected by an actual rotational speed detecting portion, a variation rate per unit time of a difference between the detected results, and to adjust the maximum absorbing torque of the hydraulic pump according to the magnitude of the variation rate.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: February 28, 2012
    Assignee: Komatsu Ltd.
    Inventors: Shotaro Ishii, Akira Fukushima
  • Patent number: 8118697
    Abstract: A simplified continuously variable transmission system control provides a variable clamping force and a differential cylinder pressure manipulation to change sheave ratios. The system control uses two pumps. The first pump provides the variable clamping force. The second pump provides pressure changes to effect ratio changes. The clamping force can be varied based upon operator demand on an associated engine.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: February 21, 2012
    Inventor: Albert W. Brown
  • Patent number: 8109847
    Abstract: An automatic transmission in the form of a belt-driven conical-pulley transmission having conical disk sets on the power input and power output sides, and an endless torque-transmitting member interconnecting the input side and the output side disk sets for transmitting torque therebetween. At least one stop at at least one of the end positions of at least one axially displaceable disk is provided with a cushioned retarding component for minimizing disk impact loads.
    Type: Grant
    Filed: October 22, 2005
    Date of Patent: February 7, 2012
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Michael Reuschel
  • Patent number: 8105191
    Abstract: The line hydraulic pressure setting portion sets the line hydraulic pressure PL, which is the base pressure for the required shift control pressure Pin and the required belt clamping pressure Pd, based on the higher of the required pressures Pin and Pd. At this time, if the continuously variable transmission is to be shifted up, the required Pin calculating portion calculates the required shift control pressure Pin based on one of the target speed ratio ?* and the actual speed ratio ? with which the required shift pressure Pv is calculated to be higher than with the other. As such, the required shift control pressure Pin is set to the minimum necessary level for shifting up the continuously variable transmission and the line hydraulic pressure PL is appropriately set to a level for obtaining the required shift control pressure Pin.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: January 31, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinya Toyoda, Hiroji Taniguchi, Yoshinobu Soga
  • Patent number: 8100791
    Abstract: A continuously variable transmission in which a sliding member is prevented from inclining is provided. The continuously variable transmission has a first oil passage provided in a movable sheave, and a second oil passage provided in a primary shaft supporting the movable sheave and connected in series to the first oil passage. A working oil is discharged from a hydraulic chamber via the first and second oil passages. The working oil is more difficult to discharge from the second oil passage than the first oil passage.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: January 24, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenichi Yamaguchi, Hiroki Kondo
  • Patent number: 8096906
    Abstract: When a vehicle decelerates rapidly, a lower limit secondary pulley pressure (Plmt) is calculated on the basis of a primary pulley rotation speed (Npri) detected by a primary pulley rotation sensor. When a deceleration speed (Gdata) is greater than a predetermined deceleration speed (G1) and a secondary pulley pressure (Psec) detected by a secondary pulley pressure sensor is lower than the lower limit secondary pulley pressure (Plmt), it is determined that slippage is about to occur in a V-belt 4 on a primary pulley side in particular, and therefore speed ratio fixing control is performed.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: January 17, 2012
    Assignee: Jatco Ltd
    Inventors: Takuichiro Inoue, Hiroki Iwasa, Hiroyasu Tanaka, Yoshihisa Kodama