Patent ID: 8001884
Filing Date: 2011-08-23
Classification: F15B

Abstract:
1. A swivel motor, comprising: a cylinder with ribs extending axially at the inner diameter, the cylinder being closed at the ends by two covers; a motor shaft with vanes having the same axial extension as the ribs of the cylinder, wherein the vanes of the motor shaft and the ribs of the cylinder, together with the cylinder, covers, and motor shaft, form individual work chambers; a first pressure medium connection and a second pressure medium connection respectively connected to two of the work chambers separated by a rib; a joining system adapted to join pairs of the work chambers such that work chambers connected to the first pressure medium connection alternate with work chambers connected to the second pressure medium connection; a pressure compensation element defining a compensation space and connected to at least two work chambers associated with different ones of he first and second pressure medium connections, the pressure compensation element comprising: a movable dividing element adapted to divide the compensation space into first and second partial compensation spaces each of the first and second partial compensation spaces being coupled to at least one work chamber respectively of the first and second pressure medium connections; oppositely acting springs configured to hold the dividing element in an initial position by a spring force characteristic, the springs comprising at least one coil spring and at least one elastomer spring, wherein at least one volume compensation space is provided in the elastomer spring.