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| Number | Title | Issue Date |
| 7631740 | Hydraulic control apparatus for an automatic dual-clutch transmission The invention relates to a hydraulic control device for an automatic dual-clutch transmission which has a first clutch and a second clutch, having a control valve unit which predefines at least one hydraulic parameter such as pressure and/or one volume flow. Regulat... | 12/15/2009 |
| 7430936 | Method for the control of operational sequencing in an automatic transmission of auxiliary construction A method for controlling operational sequencing of gears in an automatic transmission (102) which has been built in an auxiliary mode. In the case of such a shifting transmission it is possible that during the engagement of its transmission gear stage, impact... | 10/07/2008 |
| 7347117 | Hydraulic linear drive of a transmission actuator A hydraulic linear drive for a hydraulic vehicle transmission actuator has a piston/cylinder unit in which an adjusting piston is arranged so it is longitudinally displaceable in a cylinder housing and subdivides the cylinder space into at least two pressure spaces ... | 03/25/2008 |
| 7311187 | Dual clutch transmission clutch cooling circuit A hydraulic circuit for controlling the application of pressurized cooling fluid to the clutches of a dual clutch transmission including a cooling unit in fluid communication with a source of the pressurized cooling fluid and adapted to exchange heat from the coolin... | 12/25/2007 |
| 7270224 | Device for the optimization of hydraulically controlled engagement of clutches used in marine transmissions Optimization of hydraulically controlled engagement of clutches in marine transmissions by a device having two clutch control pistons, two solenoid valves arranged between the pumps, aid pistons, a bistable valve connected between the solenoid valves and pistons, a ... | 09/18/2007 |
| 6960069 | Arrangement structure of swash plate hydraulic pump hydraulic pump An arrangement structure of a swash plate hydraulic pump which can be used in a wide range of construction equipment and industrial vehicles and is small in size, simple in structure, and inexpensive is provided. For this purpose, an arrangement structure of a swash... | 11/01/2005 |
| 6206128 | Working vehicle In a working vehicle such as an agricultural tractor, a front wheel change speed device for transmitting drive to front wheels includes an equal speed clutch for driving the front wheels substantially at the same speed as rear wheels, and an accelerating ... | 03/27/2001 |
| 5350047 | Rotary valve for automatic transmission An oil passage is provided in an axially central portion of a spool which is received within a valve housing and rotatively driven by a pulse motor, and oil passages passed diametrically through the spool and connected to the oil passage, so that a hydrau... | 09/27/1994 |
| 5174422 | Transmission equipped with torque converter A transmission equipped with torque converter having a forward/backward change valve for supplying working oil selectively to any one of a forward clutch or a backward clutch. A shock diverter valve is installed between the forward/backward change valve a... | 12/29/1992 |
| 5090540 | Shift range device for automatic transmission A shift range device for an automatic transmission a shift lever shiftable to any one of a first neutral range, a reverse range, a second neutral range and one or more drive ranges which are arranged in the identified order. A neutral device includes a ma... | 02/25/1992 |
| 4936430 | Control hydraulic circuit for speed change clutch A working oil is supplied to a first set of clutch through a first control valve when the first control valve is functioning. The working oil is supplied to a second set of clutch through a second control valve, a third control valve and a fourth control ... | 06/26/1990 |
| 4920861 | Load piston reset control mechanism Fluid systems for controlling clutch engagement of a vehicle drive train normally have modulating pressure relief valves to aid in smooth clutch engagement. It is desired in such systems to ensure that the system pressure is reduced during a shift so that... | 05/01/1990 |
| 4895182 | Hydraulic control unit A hydraulic control unit, particularly for switching-over a boat reversing gear comprises a pump unit (2) fed by a tank (5), a switchable rotary slide valve combination (8) connecting two control junctions (A, B) either to the working pressure system or t... | 01/23/1990 |
| 4871048 | Control system for vehicle transmissions A transmission control system for actuating a hydraulically controlled vehicle transmission that includes a pair of shiftable valve members determining four range speed conditions and two shiftable valve members determining whether the vehicle is in forwa... | 10/03/1989 |
| 4860873 | Lubricating system for friction engaging means in transmission A lubricating system for friction engaging apparatus for supplying lubricant to at least one FORWARD friction engaging device and a REVERSE friction engaging device in a power shift transmission, which comprises: (a) a first lubricating subsystem for supplying... | 08/29/1989 |
| 4848530 | Transmission control providing sequentially engaged high and low speed clutches A clutch control for a multi-speed vehicle transmission having operator selected, hydraulically operatable clutches for the shifting of direction and speed includes a valve means which automatically engages a higher and a lower speed clutch in sequence wh... | 07/18/1989 |
| 4795017 | Hydraulic circuit for the control of forward and reverse shift clutches A hydraulic load power train control for reversible shifting with a pressure control device for the controlled build-up of a shift clutch pressure, a foot clutch valve for arbitrary control of the shift clutches, and a manually operable shift valve for sh... | 01/03/1989 |
| 4754666 | Power transmission control system A power transmission control system includes a single selector valve for setting three speed ratios and neutral position disposed between a fluid pressure source and three selectively engageable fluid pressure operated clutches for obtaining three speed r... | 07/05/1988 |
| 4735110 | Shifting arrangement for two clutches for the shifting between a single-axle standard drive and a two-axle all-wheel drive for a motor vehicle having two drivable vehicle axles A shifting arrangement for the shifting between a single-axle standard drive and an all-wheel drive, having a first clutch for the locking of a central differential gear and a second clutch for the connecting and disconnecting of one vehicle axle, actuate... | 04/05/1988 |
| 4683994 | Shifting apparatus for a drawworks transmission Drawworks transmission shifting apparatus is described that provides an arrangement of control valves, cylinders, clutches and brakes which permit the rig operator to shift the drawworks transmission into the desired setting and to lock the transmission i... | 08/04/1987 |
| 4676348 | Fluid pressure control system having a timed pressure cutback device A fluid pressure control system including a modulating pressure relief valve is normally needed in a power transmission having clutches that require smooth engagement. It is also desirable in many systems to maintain a difference in fluid pressure levels ... | 06/30/1987 |
| 4676349 | Fluid pressure control system having a pressure cutback device A fluid pressure control system including a modulating pressure relief valve is normally needed in a power transmission having clutches that require smooth engagement. It is also desirable in many systems to maintain a difference in fluid pressure levels ... | 06/30/1987 |
| 4648493 | Rotational control apparatus A rotational control apparatus is shown in its most preferred form according to the teachings of the present invention as a combination clutch/brake. The clutch/brake includes an interfacing member formed by first and second pressure plates rotatably moun... | 03/10/1987 |
| 4637504 | Combination range and master clutch assembly A combination range and master clutch assembly includes a separator plate, at least one clutch, a fluid actuated main piston for engaging each clutch, and at least one fluid actuated accelerator piston. The separator plate and main piston define first and... | 01/20/1987 |
| 4607736 | Multiple speed drive system An oil shear clutch-brake unit includes a housing rotatably supporting an input shaft and an output shaft in axial alignment, and the housing encloses a set of interfitting clutch plates and discs for coupling the input shaft to the output shaft and a set... | 08/26/1986 |
| 4598545 | Power transmission control apparatus There is disclosed a power transmission control apparatus having a clutching function and a modulating function and enabling a vehicle installed with this apparatus to make a sudden start after a clutch has been disengaged. The apparatus includes a main c... | 07/08/1986 |
| 4579200 | Inching control apparatus An inching control apparatus comprising a hydraulic pressure source, a plurality of clutches and, in a hydraulic circuit connecting the clutches to the hydraulic pressure source, a pressure regulating valve, an inching valve which receives output pressure... | 04/01/1986 |
| 4560045 | Transmission control system for a transmission having input shafts clutched to a power source An automatic transmission having two torque input shafts is connected selectively to an engine through hydraulically actuated clutches. Each input shaft is associated with one of the clutches and with a first or a second group of gear ratios. A driveable ... | 12/24/1985 |
| 4552255 | Multiple speed drive A multiple speed drive unit that has a first input shaft driven by a motor, a plurality of secondary input shafts driven by the first input shaft, an output shaft, an oil shear brake for the output shaft, an oil shear clutch for each of the secondary inpu... | 11/12/1985 |
| 4502577 | Control mechanism of a power shift transmission A control mechanism of a power shift transmission is disclosed and arranged in oil passages between the hydraulic pressure source and a hydraulic clutch, comprising an inching valve disposed in an upstream passage of said passages; a selector valve dispos... | 03/05/1985 |
| 4489623 | Axle shaft and pump drive mechanism An axle shaft and pump drive mechanism (12) for a vehicle (10) includes a continuously variable transmission unit (24), an axle shaft (20), a pump (22), and a coupling device (34,78) for connecting the transmission unit (24) to the axle shaft (20) or to t... | 12/25/1984 |
| 4465168 | Pressure control system for a transmission A pressure control system for a transmission having a series of fluid-operated clutches which are engaged and disengaged through a selector valve to change drive ratios, has a valve for modulating the fluid pressures applied to the clutches to effect smoo... | 08/14/1984 |
| 4452101 | Transmission for a working vehicle A power transmission has a valve means capable of applying hydraulic pressure to forward and reverse drive clutches and first and second speed clutches corresponding to the position of shift lever. The valve means has a plurality of ports respectively cor... | 06/05/1984 |
| 4440041 | Winch apparatus A winch apparatus (8) with a shift control mechanism (10) is disclosed for axially positioning a shaft (66) and effecting low and high speed raising of a load on a winch drum (24) and a centered neutral condition. The winch apparatus (8) advantageously in... | 04/03/1984 |
| 4312243 | Change-under-load transmission The invention relates to a change-under-load transmission having an input shaft (1) and an output shaft (6), each carrying a pair of gearwheels (2, 3; 4, 5). A composite layshaft comprises two pairs of coaxial shafts (7, 8; 9, 10) which are aligned axiall... | 01/26/1982 |
| 4301689 | Transmission control system In a transmission control system for a multiple speed ratio powershift transmission having a speed control valve and a plurality of fluid pressure operated clutches adapted to establish torque ratio changes, an electronic speed sensing system and downshif... | 11/24/1981 |
| 4253553 | Control apparatus for an oil pressure operated transmission in automotive vehicle The present invention discloses a control apparatus for an oil pressure operated transmission in an automotive vehicle. The apparatus comprises a transmission with at least two stages of low speed and high speed forward driving trains and it is so arrange... | 03/03/1981 |
| 4129148 | Clutch modulator Modulated hydraulic clutch pack engagement is provided in a single valve body which includes a drive direction selector spool, a dump valve, a pressure modulating spool, a downstream system pressure regulator and a provision for continuous flow to a downs... | 12/12/1978 |
| 4126059 | Pressure boost system for a powershift transmission A fixed displacement pump is connected to deliver operating fluid to a torque converter and to a transmission shift control valve that is operable for selectively coupling working fluid to one or more hydraulically operable shift elements of a transmissio... | 11/21/1978 |
| 4096882 | Control valve A control valve having a rotor for communicating outlet port or ports selectively to fluid drain port or to inlet port so as to change flow direction of fluid to be supplied to fluid operated apparatus. The control valve comprises first and second pistons... | 06/27/1978 |
