| 摘要 |
PURPOSE:To permit smooth interlock between the spool of a hydraulic control valve for a steering clutch apparatus and a piston of the equalizer of a traveling brake apparatus by arranging said both devices in series. CONSTITUTION:An actuator 23 pushes a clutch frictional plate apparatus 28 for close connection. Steering clutch operation is performed through feed of the compressed oil for connecting and disconnecting clutch through oil passages 47 and 46 into a hydraulic control valve fitted onto the upper surface of a transmission case 2. A piston is pushed towards a spool by a spring, but when the spool is pushed rightward as clutch cut-off operation proceeds, also the piston is pushed- into, and the pressure of the oil increases, after the oil passes through a working-oil feeding valve, and said pressure is transmitted to an oil passage 48. With the aid of said pressure, an actuator 36 allows a frictional plate apparatus 37 to be set into closely attached state to apply brake. |
