Hydrostatic transmission
AssigneeParker-Hannifin Corporation
InventorsXingen Dong, Barun Acharya, Frank P. Holzschuh
Life of this patent
Estimating the term…
Abstract
A compact, integrated hydrostatic transmission without reduction gearing wherein the pump and motor are contained within a single housing, and an output shaft extends from the housing inline with a shaft of the motor. The output shaft is directly connectable to a wheel of a vehicle. The pump and motor share a common sump within the housing in which pump and/or motor leakage is collected.
Claims16
A hydrostatic transmission comprising a hydraulic pump, an input shaft for rotatably driving the hydraulic pump, an output shaft, a hydraulic motor for driving the output shaft, wherein the motor includes a driven shaft that has a portion forming the output shaft, and a housing enclosing at least a portion of the hydraulic pump and the entire hydraulic motor except for the portion of the driven shaft forming the output shaft, wherein the hydraulic pump and hydraulic motor share a common sump within the housing, wherein the output shaft extends through a wall of the housing in axial alignment with a rotational axis of the motor and has an axle portion to which a hub of a wheel of a vehicle can be mounted, and wherein the housing has a protruding tubular portion in which the output shaft is rotatably journalled, the protruding tubular portion being configured for extension through a frame of a vehicle for supporting the axle portion of the output shaft adjacent the hub when mounted thereto.
A hydrostatic transmission including a pump, a motor, and a housing containing at least one of the pump and the motor, the housing having first and second mating parts each including a fluid passageway for operatively fluidly connecting the pump and the motor, the fluid passageways of the first and second mating parts opening at respective counterbores to mating faces thereof, and a seal insert having at least one end portion extending into a corresponding one of the counterbores, the seal insert having an insert passageway that extends from an opening at one end of the insert to an opening at the other end of the insert for providing a flow passage therethrough, the ends of the insert passageway being in communication with the respective passageways of the first and second mating parts, wherein a sealing element is disposed at each end of the seal insert at a bottom of the respective counterbore for sealing the seal insert to the respective mating part, and wherein the mating faces of the first and second mating parts mate with each other.
A hydrostatic transmission comprising a pump, a motor having an output shaft, and a housing containing the pump and the entire motor except for the output shaft, the pump including an input shaft extending from a bottom side of the housing, the input shaft having a drive wheel fixed for rotation therewith and connectable to a prime mover, the output shaft extending through the housing at a right angle relative to the input shaft and in axial alignment with a rotational axis of the motor and having an axle portion to which a hub of a wheel of a vehicle can be mounted, whereby the prime mover, when coupled to the drive wheel, may have its center of gravity disposed lower than if the drive member was located on an input shaft extending from a top side of the housing, and wherein the housing has a protruding tubular portion in which the output shaft is rotatably journalled, the protruding tubular portion being configured for extension through a frame of a vehicle for supporting the axle portion of the output shaft adjacent the hub when mounted thereto.
Dependencies are inferred from the claim text.