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Speed control system for a working vehicle

  • US 4,977,760 A
  • Filed: 12/09/1988
  • Issued: 12/18/1990
  • Est. Priority Date: 12/15/1987
  • Status: Expired due to Fees
First Claim
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1. A speed control system for a working vehicle comprising:

  • a hydrostatic transmission (6) for propelling the vehicle, said hydrostatic transmission including a control shaft (9) for varying a swash angle,a control arm (10) extending from said control shaft and defining a fork portion in a free end thereof,manual control means (17) for manually controlling said hydrostatic transmission (6),a hydraulic cylinder (11) including a cylinder case (12) operatively connected to said control shaft (9) for varying the swash plate angle of said hydrostatic transmission (6),engaging means (12c) in an outer lateral wall of said cylinder case (12) for engaging said fork portion of the control arm and transmitting movement of the cylinder case to said control arm,a piston rod (14) fixed to a case (5) containing said hydrostatic transmission (6), anda control valve (15) fixed to said cylinder case (12) and including a spool (16) operatively connected to said manual control means (17), said cylinder case (12) being shiftable following a shift of said spool (16).

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