| 摘要 |
PURPOSE:To minimize stepped feeling at the time of sudden braking and to perform auxiliary valve operation at the time of sudden braking with small force. CONSTITUTION:A ventilation passage 29 communicated to a pressure change chamber 6 is provided on a small diametral cylinder part 9, a valve element 34 to normally close the ventilation passage 29 is provided to face on the opening part of one end side of the ventilation passage 29 and a power transmission mechanism 42 positioned on the side of an inner space of a valve body 10, interposed between the valve element 34 and an input rod 13 and to move the valve element 34 in the valve opening direction in accordance with forwarding movement of the input rod 13 is provided. As the power transmission mechanism 42 is arranged on the side of the inner space of the valve body 10 and it is possible to avoid a member for operation of the valve element 34 from sliding on a seal member 11, it is possible to reduce a set load of a spring 52 for a tubular member, and accordingly, it is possible to minimize stepped feeling by way of performing operation of the valve element 34 in the valve opening direction with comparatively small force. It is possible to carry out valve opening operation of an auxiliary valve mechanism 35 with comparatively small step-on force at the time of sudden braking. |
