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Parking lock for automatic gearboxes of motor vehicles

  • US 4,722,427 A
  • Filed: 10/06/1986
  • Issued: 02/02/1988
  • Est. Priority Date: 10/18/1985
  • Status: Expired due to Fees
First Claim
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1. An automatic transmission parking brake comprising:

  • a parking gearwheel adapted to be fixed to a power output shaft of the transmission;

    an actuating rod, an actuator sleeve defining a cylinder located at one end of said actuating rod;

    a compression spring in said cylinder between said rod and said actuator sleeve adapted to resist relative movement between them;

    said one rod end defining a piston movable within said cylinder, and said sleeve further defining a tapered shoulder;

    a pawl mounted for oscillatory movement about a fixed pivot axis into and out of engagement with said gearwheel, said shoulder engaging said pawl to actuate the latter when said actuator rod is moved toward said gearwheel;

    said cylinder being formed with a pneumatic fluid flow orifice between the interior of said cylinder and the atmosphere whereby relative movement of said sleeve relative to said actuator rod is cushioned.

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