Patent ID: 7077256
Filing Date: 2006-07-18
Classification: F16D,Y10T

Abstract:
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 ).