Speed-difference-dependent hydraulic coupling with control valves

A coupling comprising:

• a stationary housing (25) which forms a reservoir for operating fluid,
• a rotating gear housing (27) disposed in the stationary housing (25),
• a hydrostatic displacement machine (35) disposed in the gear housing (27),
• a drive shaft (30),
• a friction coupling (36) interconnecting the drive shaft (30) with the gear housing (27),
• a piston (5) to have an impact on the friction coupling (36) for creating pressure in a pressure chamber (4) when there is a differential speed between the gear housing (27) and the drive shaft (30),
• the hydrostatic displacement machine (35) is provided with a first opening (9) and a second opening (10) for the supply and discharge of operating fluid and a third opening (11) and fourth opening (12) for connection with the pressure chamber (4),
• the coupling being characterized by the first and second openings (9, 10), being connected by means of a first and second rotating insertion (13, 14), respectively, and a first and second control valve (15, 16), with rigid housings and are formed as regulating throttle valves, so that independent of the direction of the differential speed, coupling can be controlled on the respective supply side as well as on the discharge side of the displacement machine.