| 摘要 |
PROBLEM TO BE SOLVED: To provide no accelerating clutch slip mechanism by providing an acceleration time slip means for slipping a hydraulic clutch in accelerating on a hydraulic circuit, and switching the action of an operating oil pressure control means to that of the accelerating time slipping means. SOLUTION: As an oil passage for reducing operating oil pressure for clutch slip, a pressure reducing oil passage R8 is branched from an oil passage R2 and joined to an oil passage R5. That is, operating oil allowed to flow in the pressure reducing oil passage R8 is replenished as lubricating oil for a clutch or drained. In pressure reducing oil passage R8, a pressure adjusting valve V8 is provided upstream and a sound reducing and acceleration switching valve V9 is interposed downstream. The pressure adjusting valve V8 is an opening and closing switching valve, and the valve opening is adjusted by the adjustment of an adjusting screw. When acting as an accelerating mechanism, the quantity of operating oil to pass the oil passage R2 is remarkably decreased by passage of operating oil in the accelerating oil pressure R8b having the low throttling degree, and the hydraulic clutch is made into a half-clutch slip state. |
