Hydraulic apparatus with return to neutral mechanism

  • US 6,782,797 B1
  • Filed: 11/26/2002
  • Issued: 08/31/2004
  • Est. Priority Date: 02/20/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A hydraulic drive apparatus, comprisinga casing having a hydraulic pump mounted therein;

  • a moveable swash plate cooperable with the hydraulic pump for controlling the output thereof;

    a rotatable shaft coupled to the moveable swash plate and extending from the casing; and

    a speed adjusting mechanism mounted to the casing and drivingly coupled to the rotatable shaft, the speed adjusting mechanism comprising;

    a control arm engaged to the rotatable shaft to move the swash plate between forward and reverse positions; and

    a unidirectional return to neutral mechanism for biasing and returning the rotatable shaft to a neutral position when the shaft is in one of the reverse or forward positions but not from the other position.

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