Stepless, hydraulically adjustable belt drive with sliding cone discs - has pipes from control valve connected together by short-circuiting pipe opened only when pump is stopped

摘要

The pipes (16, 17) from the control valve (12) to the thruster units (9,10) are connected together by a short-circuiting pipe (43). This pipe is opened only when the pump (13) is stopped. The pipe contains a valve (44) shut by pressure from the pump when this is running, typically via a pressure detector in the pump pressure pipe (15). The valve (44) can be shut by a ram in opposition to a spring (46). ADVANTAGE - Prevents belt slippage when being towed.