Speed differential-dependent hydraulic clutch with a control valve

  • US 7,077,256 B2
  • Filed: 03/22/2002
  • Issued: 07/18/2006
  • Est. Priority Date: 04/02/2001
  • Status: Expired due to Fees
First Claim
Patent Images

1. A speed-difference-dependent hydraulic clutch, comprising a drive housing (11), which rotates in a housing (20) that is fixed in space and forms a reservoir for a working fluid, a first shaft (21) which can be selectively connected in a rotationally fixed manner to the drive housing, a second shaft (22) which is connected in a rotationally fixed manner to the drive housing, and furthermore a hydrostatic displacement machine (1), a friction clutch (12) for selectively connecting the first shaft (21) to the drive housing (11) and a piston (10) for acting on the friction clutch (12), which are accommodated in the drive housing, the drive housing (11) having a pressure space (9), and means for producing a pressure in the pressure space (9) when a difference occurs between the speed of the drive housing (11) and that of the first shaft (21), wherein the pressure in the pressure space gives rise to action upon the friction clutch (12), and a passage (13) leading from the pressure space to a control valve (14) which selectively communicates with a space of lower pressure in a controlled manner, wherein the control valve (14) is arranged in the drive housing (11) and/or, in the second shaft (22), which is connected in a rotationally fixed manner to the drive housing (11), and is arranged coaxially with said shaft, and has a control element (52) which can be displaced in the direction of the axis and is actuated by an actuator (59, 61, 62;

  • 74) which is fixed on the housing, wherein the actuator is arranged outside the second shaft, and is connected in a rotationally fixed manner to the drive housing, is mounted fixed on the housing and acts on the control element (52), wherein the control valve (14) comprises the control element (52) and a valve body (44) having a cylindrical surface (47) which is coaxial with the axis of rotation and is intended for the control element (52), the coaxial cylindrical surface (47) being open into the interior of the drive housing (11) and the passage (13) leading from the pressure space (9) into an inlet opening (46) on the cylindrical surface (47).

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