Deere + Company

Richard Marvin Sparks

Clayton George Janasek

Briton Todd Eastman

Craig R Eike

George W Detrick

Kendall D Tjepkes

Russell Dee Taylor

A drive assembly for a work vehicle includes an electric motor configured to rotate a driving shaft and a gear train configured to transmit torque between the driving shaft and a driven shaft. The drive assembly also includes a clutch member having an engaged position and a disengaged position. The clutch member is configured to allow torque transfer between the driving shaft and the driven shaft when in the engaged position. The clutch member is configured to prevent torque transfer between the driving shaft and the driven shaft when in the disengaged position. The clutch member is biased toward the disengaged position to prevent torque transfer in a direction from the driven shaft toward the driving shaft in an overspeed condition of the drive assembly.

Work vehicle drive assembly with electric motor overspeed protection

A clutch assembly configured to selectively engage and disengage a power source and a transmission includes an input member configured for coupling to the power source and an output member configured for coupling to the transmission. A clutch pack is engaged with the input member for co-rotation about an axis. A housing is engaged with the output member and with the clutch pack and is further configured to move in a first direction along the axis and in a second direction opposite to the first direction. The clutch assembly includes a cover and a ring member positioned along the axis from the cover such that the cover and the ring member define a movable chamber therebetween configured to receive a hydraulic fluid. The clutch pack is operable to decouple the input member from the output member in response to a pressure of the hydraulic fluid within the chamber.

Clutch release system

A work vehicle including an engine and a transmission. The transmission is driven by the engine. The transmission includes an input clutch, an output clutch, and a hydraulic pump/motor. The hydraulic pump/motor is operatively connected between the input clutch and the output clutch.

Hydraulic regenerating and low-speed operating power shift transmission

A method of controlling, in response to a shift command, a commanded shift of a powershift transmission of an engine-driven vehicle includes monitoring speeds transmission component selected according to the commanded shift and monitoring a speed ratio therefrom. If the input section will speed up during the commanded shift, the speed clutches are swapped, and then the output clutches are swapped when the monitored speed ratio matches a stored speed ratio. Also, the input speed of an input shaft of the transmission is monitored, and the pressure of the off-going output clutch is controlled to limit the deceleration of the input shaft speed to desired limits. If the input section will slow down during the commanded shift, the output clutches are swapped, and then the speed clutches are swapped when a monitored speed ratio matches a stored speed ratio. If a particular shift requires swapping of only speed clutches, then a speed ratio is monitored for the pair of the speed clutches to be swapped. If the input section will speed up or slow down during the commanded shift, the pair of speed clutches are swapped, and the monitored speed ratio is compared to a predetermined stored speed ratio value to determine when swapping of the speed clutches is completed, and after the speed clutches are swapped, one of the output clutches is fully pressurized to complete the shift.

Transmission shift control method

A powershift transmission of an engine-driven vehicle includes input and output shafts, a plurality of fluid pressure operated clutch for controlling flow of torque through the transmission and pressure control valves for controlling fluid pressure communicated to the clutches. A method of controlling an off-going clutch during a shift of the transmission includes detecting a load on the engine, as a function of the detected load, determining a slip pressure, which when applied to the clutch would cause the clutch to slip, and applying the slip pressure to the clutch. If the clutch is not slipping, the pressure applied to the clutch is reduced until relative rotation (slip) between the input and output elements of said clutch is detected. Then a pressure increase is determined, which when applied to the slipping clutch would allow the slipping clutch to continue to slip while transmitting the same torque it was transmitting before it began to slip. Finally, this pressure increase is applied to the slipping clutch.

Slip-based shift control system

An oil seal arrangement includes a non-rotating oil ring and a rotating guide ring. A flexible oil seal is bonded to the oil ring and sealingly engages the guide ring to retain lube oil in a bearing chamber. A flexible lip seal and a spacer member rotate with the guide ring and slidably engage portions of the oil ring which are exposed to lube oil and spaced apart from the oil seal.

Growing community of inventors

Bartlesville, OK, United States of America

Richard Marvin Sparks