Fluid-press Operated Patents (Class 192/3.57)
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Patent number: 7073645Abstract: A control of a drive train for a wheel loader having one pressure-medium actuated brake and one transmission operated via a torque converter and at least one forward and/or reverse gear respectively actuated via a power shift clutch and one power take off wherein, when a predetermined value of the power delivered by the transmission to the power take off is exceeded, the pressure of the engaged power shift clutch for the forward or reverse gear is reduced to a residual level.Type: GrantFiled: January 15, 2003Date of Patent: July 11, 2006Assignee: ZF Friedrichshafen AGInventor: Hugo Burkhart
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Patent number: 7001299Abstract: According to an aspect of the present invention, an automatic transmission includes plural friction engaging elements configures plural shift ranges based on combinations of each friction engaging element being in engaging or disengaging condition, a controlling unit for controlling the friction engaging elements to be in engaging or disengaging condition by controlling a hydraulic pressure applied.Type: GrantFiled: March 25, 2004Date of Patent: February 21, 2006Assignee: Aisin Seiki Kabushiki KaishaInventors: Kiyoharu Takagi, Akira Aikawa
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Patent number: 6973850Abstract: The transmission gear shift lever device has a variable select lever ratio adapted to accommodate most of the operating mechanisms of the conventional transmission gear shift (TGS) lever device without major design changes. The select lever ratio is a ratio of rotating angle of a select lever relative to the rotating angle of the TGS lever and can be varied during the select manipulation of the TGS lever, such that all shift stages in a 6-speed transmission can be controlled while the rotating angle of the TGS lever during the select manipulation is maintained at the same size as that of a conventional TGS lever device.Type: GrantFiled: December 23, 2002Date of Patent: December 13, 2005Assignee: Hyundai Motor CompanyInventor: Yong-Dal Choi
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Patent number: 6905433Abstract: A device for control of a hydraulically actuatable shifting element of a motor vehicle transmission, having one clutch piston which defines, with a first surface, a hydraulically pressurizable piston space and, with a second surface of different size, a hydraulically pressurizable reset space and comprising a first clutch valve associated with the piston space, a second clutch valve associated with the reset space and a holding valve associated with the reset space. The valves can be moved according to a control pressure adjusted by a pressure adjuster, a change between a pressurization of the clutch piston on the piston space side and on the reset space, side being performed as a control function so that the clutch piston on its surface facing the reset space is pressurized in an unshifted state of the shifting element and is discharged in a shifted state of the shifting element.Type: GrantFiled: August 25, 2003Date of Patent: June 14, 2005Assignee: ZF Friedrichshafen AGInventors: Thilo Schmidt, Georg Gierer, Klaus Steinhauser
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Publication number: 20040231943Abstract: The invention relates to a drivetrain comprising an internal combustion engine, at least one friction clutch having at least one disengagement device with a pressure relief device and a transmission.Type: ApplicationFiled: March 2, 2004Publication date: November 25, 2004Applicant: LuK Lamellen und Kupplungsbau Beteiligungs KGInventors: Reinhard Berger, Burkhard Pollak
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Publication number: 20040182669Abstract: A shifter handle for a motorcycle or ATV which has an integral clutch release lever, operable by the fingers of the same hand used for shifting the gears. Being mounted in either the jockey position, adjacent to the seat, or the tank shift position which is mounted vertically from the shifter pedal shaft, the clutch controls are removed from the handlebars making said clutch release lever integral to the handle used for shifting the gears. Trends in the custom cruiser industry are to remove the visible controls from the handlebar area for aesthetic purposes. There are important applications such as the area of modification for the handicapped. Spinal cord injured persons with little or no use of the legs, or amputees where a foot shift device is impossible to use need no longer be prohibited from enjoying riding this type machine. The hand shift devices of the past are no longer precarious or dangerous with both operations in the same hand.Type: ApplicationFiled: March 19, 2003Publication date: September 23, 2004Inventor: David Paul Thompson
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Patent number: 6776275Abstract: Drive system for an all-wheel driven motor vehicle having a first and a second driven axle (3, 9), which drive system has a differential-speed-dependent clutch (6) for driving the second driven axle, and an at least partially lockable differential (8) between the wheels of the second driven axle (9). The differential-speed-dependent clutch (6) comprises a pump (10) which, when a differential speed occurs, produces a pressure which leads to the transmission of a torque to the second driven axle (9). In order to ensure that the differential lock responds in a manner coordinated neatly in terms of time and taking account of the driving state, a connecting line (18) leads from the delivery side (11 or 12) of the pump (10) to an actuating member (27) of the lockable differential (8), with the result that, when a differential speed occurs, the pressure produced by the pump (10; 67) makes it possible to at least partially lock the differential (8) by means of a positive locking clutch (26).Type: GrantFiled: March 26, 2003Date of Patent: August 17, 2004Assignee: Steyr Powertrain AG & Co. KGInventor: Franz Gratzer
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Patent number: 6658951Abstract: A hydraulic actuation system for an automated transmission system including an active clutch includes; a hydraulic clutch actuator controlling engagement of the clutch, the hydraulic control actuator being preloaded towards a disengaged position of the clutch, whereby pressure above a first predetermined value is required in order to move the clutch to a predetermined position; first and second gear engagement actuators for controlling the selection and engagement of a selected gear ratio; a source of hydraulic fluid under pressure, a hydraulic fluid reservoir; a clutch control valve for selectively connecting the clutch actuator to the source of hydraulic fluid under pressure or to the reservoir; a gear engagement control valve for selectively connecting each gear engagement actuator to the source of hydraulic fluid under pressure or to the reservoir; and a changeover valve situated between the gear engagement control valve and the first and second gear engagement actuators, said changeover valve in a firstType: GrantFiled: February 12, 2002Date of Patent: December 9, 2003Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KGInventor: David Anthony Harries
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Patent number: 6647332Abstract: The present invention provides a method and apparatus for controlling the pressure of an actuating fluid flowing through an inching clutch. The invention includes the steps of determining an actual pressure of the actuating fluid, establishing an inching pressure threshold, comparing the actual pressure with the threshold, and controlling the actual pressure in response to the comparison. In one embodiment, the pressure is controlled using a first control algorithm in response to the fluid pressure being less than an inching threshold, and using a second control algorithm in response to the pressure being greater than or equal to the inching threshold.Type: GrantFiled: December 21, 1998Date of Patent: November 11, 2003Assignee: Caterpillar IncInventors: James D. Esterby, Jeffrey T. Ryan, Douglas L. Sloan
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Publication number: 20030173179Abstract: Drive system for an all-wheel driven motor vehicle having a first and a second driven axle (3, 9), which drive system has a differential-speed-dependent clutch (6) for driving the second driven axle, and an at least partially lockable differential (8) between the wheels of the second driven axle (9). The differential-speed-dependent clutch (6) comprises a pump (10) which, when a differential speed occurs, produces a pressure which leads to the transmission of a torque to the second driven axle (9). In order to ensure that the differential lock responds in a manner coordinated neatly in terms of time and taking account of the driving state, a connecting line (18) leads from the delivery side (11 or 12) of the pump (10) to an actuating member (27) of the lockable differential (8), with the result that, when a differential speed occurs, the pressure produced by the pump (10; 67) makes it possible to at least partially lock the differential (8) by means of a positive locking clutch (26).Type: ApplicationFiled: March 26, 2003Publication date: September 18, 2003Inventor: Franz Gratzer
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Publication number: 20030168299Abstract: The invention relates to a starter unit (1), comprising the following: an input (E) which may be coupled to a drive input; an output (A) which may be coupled to a drive output; a starter element (1) in the form of a hydrodynamic coupling comprising a pump wheel (4) and a turbine wheel (5) which together form a toroidal working chamber (6) and a pump wheel shell (10) which is coupled to the pump wheel (4) in a rotationally fixed manner; and a converter lockup clutch (7) comprising at least two clutch disks which may be brought into frictional functional engagement with each other, directly or indirectly, by means of further transmission means—a first clutch disk (8) and a second clutch disk (9). The first clutch disk (8) is rotationally fixed to the pump wheel shell (10) and the second clutch disk (9) is rotationally fixed to the turbine wheel (5).Type: ApplicationFiled: April 11, 2003Publication date: September 11, 2003Inventors: Heinz Holler, Reinhard Kernchen, Achim Menne, Werner Klement
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Publication number: 20030150683Abstract: A control apparatus for a power train including a continuously variable transmission and a clutch arranged in series with the continuously variable transmission is provided in which an engaging pressure of the clutch is first reduced until a slip occurs, and is then increased after detection of the slip so as to re-engage the clutch, and an engaging pressure of the clutch to be established is calculated by giving an excess pressure to the engaging pressure at which the clutch is re-engaged, such that an excess amount of the transmitted torque of the clutch is set smaller than that of the continuously variable transmission. The control apparatus is adapted to determine a learned value as a correction value of the engaging pressure that is set in advance in accordance with an input torque applied to the clutch, based on the engaging pressure calculated by giving the excess pressure to the engaging pressure at which the clutch is re-engaged.Type: ApplicationFiled: February 3, 2003Publication date: August 14, 2003Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazumi Hoshiya, Yasunori Nakawaki, Kunihiro Iwatsuki, Yasuhiro Oshiumi
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Patent number: 6602161Abstract: The power train of a motor vehicle employs an electronic control unit which selects the extent of engagement of the friction clutch between the engine and the transmission by way of an electronic or fluid-operated actuator. The throttle valve for the engine is adjustable by the control unit and/or by the accelerator pedal to ensure predictable starting of the motor vehicle from standstill on a road surface having a pronounced slope and/or when the motor vehicle carries a heavy load.Type: GrantFiled: September 14, 2001Date of Patent: August 5, 2003Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KGInventors: Fred Roar Hemmingsen, Karl Frode Ring, Ole Jonny Waerp, Torgeir Sundet, Morten Berger Gunnerud
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Patent number: 6585002Abstract: The present invention relates to automatic transmissions of land motor vehicles. Specifically, the present invention relates to pressure regulation in the system of automatic transmissions of land motor vehicles. The present invention is a pressure regulator valve that limits TV pressure. This valve is meant to replace the original equipment valve in the same casing the said original valve sat. The pressure regulator valve is slightly oversized and the kit has an o-ring equipped end plug to more positively seal the valve bore and prevent pressure loss, known in the industry as EPC/TV pressure. Furthermore, the valve has annular grooves added to prevent side loading by properly centering the valve in a bore. The pressure regulator valve comprises a steel ball and a spring combination with a gel like substance being added to prevent high wear and tear of the entire valve.Type: GrantFiled: January 3, 2002Date of Patent: July 1, 2003Assignee: sonnax Industries, Inc.Inventor: Maura Jane Stafford
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Publication number: 20030075408Abstract: Hydraulic control system for a vehicle transmission connected to an output shaft from a hydraulic torque converter (1) with a hydraulically operated disc clutch for locking the torque converter and which has two hydraulically operated disc clutches for shifting. The control system has a low pressure circuit (30) with a low-pressure pump feeding fluid through the torque converter, and a high pressure circuit (34) with a high-pressure pump (35), which feeds fluid via valves (38) to the disc clutches. The high-pressure pump has variable displacement, which is regulated by the operating pressure of the disc clutch of the torque converter, so that the high-pressure pump is set to a lower displacement when this last-mentioned clutch is engaged than when it is disengaged.Type: ApplicationFiled: October 21, 2002Publication date: April 24, 2003Inventor: Sverker Alfredsson
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Publication number: 20030010590Abstract: A vehicle gearbox (2) comprises a centrally operating device (28) for releasing the clutch (6), which is provided between the clutch disc and the clutch bell housing of the gearbox (2). A transmission control unit (22) provided on or in the gearbox (2) is both electrically connected directly with the device (28) and the medium for actuating the clutch (6) is received directly from the transmission control unit (22).Type: ApplicationFiled: July 11, 2002Publication date: January 16, 2003Inventor: Wilhelm Hardtle
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Patent number: 6443277Abstract: A first clutch circuit for an automatic transmission in a hybrid drive vehicle comprises an apply line extending from a manual valve to a clutch, with a check ball disposed in the apply line operable to move out of the apply line upon upstream fluid pressure, and an exhaust line extending from the apply line, downstream of the check ball, to an exhaust valve. A driver-triggered valve actuating means operates to close the exhaust valve when the driver selects drive with a driver shift lever and to open the exhaust valve when the driver shifts out of drive thereby releasing the clutch.Type: GrantFiled: September 14, 2000Date of Patent: September 3, 2002Assignee: General Motors CorporationInventors: Joel A. Taylor, David Allen Blenc, Robert Charles Downs, James Kevin Mainquist, Goro Tamai, Kyle Kenneth Kinsey
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Patent number: 6289986Abstract: A pump rod drive and torque release mechanism for use in association with a downhole pump positioned within a well. The pump rod drive and torque release mechanism comprises a central housing having a generally hollow interior, a drive shaft received within the central housing, a drive rod received within the central housing, and a torque transfer mechanism positioned within the central housing. The drive shaft may be operatively connected to a pump rod rotator to impart rotational movement to the drive shaft. The drive rod may be operatively connected to a downhole pump so as to enable transference of rotational energy from the drive rod to the downhole pump. The torque transfer mechanism has an engaged position wherein it operatively connects the drive shaft to the drive rod such that rotation of the drive shaft causes rotation of the drive rod. The torque transfer mechanism also has a disengaged position wherein it operatively disconnects the drive shaft from the drive rod.Type: GrantFiled: February 25, 2000Date of Patent: September 18, 2001Assignee: Torque Control Systems Ltd.Inventors: Andrew J. Wright, Michael Wawrzynowski
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Patent number: 6196252Abstract: The present invention provides a shuttle valve for a multipath hydraulic circuit comprising a valve body having a main passage extending along an axis and having a uniform inner periphery. The shuttle valve further has a slider valve positioned within the main passage which has a first section adjacent and attached to a second section. The first section has a first outer periphery substantially similar to the inner periphery of the main passage such that the first section of the slider valve and the main passage substantially prevent fluid flow therebetween. The first outer periphery extends a predetermined length which is shorter than the intersection length. The second section has a second outer periphery with a recessed portion being recessed from the outer periphery of the main passage such that fluid is able to pass between the second section and the inner periphery of the main passage.Type: GrantFiled: September 30, 1999Date of Patent: March 6, 2001Assignee: DaimlerChrysler CorporationInventors: Berthold Martin, Valentin Botosan, Charles K. Streetman
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Patent number: 6167995Abstract: A release mechanism for a motor vehicle friction clutch for cooperation with a motor vehicle transmission having subdivided switching steps. The mechanism includes a release member displaceable by a compressed air for carrying out a clutch release process, a valve arrangement for selectively supplying the compressed air, and a measurement arrangement for detecting an actual release position of the release member. The valve arrangement carries out the application of pressure fluid to the release member in accordance with (1) a reference variable provided by an actuation arrangement and which represents a reference release position of the release member, and (2) the detected actual release position. The measurement arrangement is so constructed that when the detected actual release position exceeds a predetermined switching threshold release position, a shifting signal is provided for shifting the transmission in subdivided switching steps.Type: GrantFiled: May 5, 1999Date of Patent: January 2, 2001Assignee: Mannesmann Sachs AGInventor: Joachim Lindner