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Change-speed control system for utility vehicle having stepless change-speed apparatus for speed-changing engine output and transmitting the speed-changed output to traveling unit

  • US 7,926,387 B2
  • Filed: 03/12/2008
  • Issued: 04/19/2011
  • Est. Priority Date: 02/24/2003
  • Status: Active Grant
First Claim
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1. A work vehicle comprising:

  • a pair of steerable front wheels and a pair of rear wheels;

    a frame supported by the front and rear wheels;

    an engine supported by the frame and generating power to drive at least the rear wheels, a forward end of the engine being located in a middle region between a first line that passes through each shaft of the pair of front wheels and a second line that passes through each shaft of the pair of rear wheels, when the front and rear wheels are oriented straight forward, or closer to the second line than to the first line, wherein a crank shaft of the engine extends in a longitudinal direction of the work vehicle;

    a gear transmission that defines a part of a drive train for transmitting power from the engine to at least the rear wheels;

    a transmission case that houses at least the gear transmission, the transmission case being connected to the engine such that the engine and the case foams an integral unit;

    a hydrostatic change speed apparatus that transmits power from the engine to the gear transmission; and

    a first housing for the hydrostatic change speed apparatus that houses at least a part of the hydrostatic change speed apparatus,wherein the hydrostatic change speed apparatus has a hydraulic pump, a fixed displacement hydraulic motor and a variable displacement hydraulic motor, wherein the first housing houses the hydraulic pump and the fixed displacement hydraulic motor.

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