摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain an automatic parking brake condition by a simple structure involving no electric power consumption. <P>SOLUTION: The parking brake condition is obtained by advancing operation of a parking piston 33 in response to action of control hydraulic pressure for parking, and the advancing condition of the parking piston 33 is mechanically locked by a lock mechanism 43. In addition, a locking part 45 having an arcuate locking face 45a of which cross sectional shape parallel with a plane orthogonal to axis lines of the parking piston 33 and a lock piston 44 is swollen backwardly is provided in a stopper 36 connected with the parking piston 33. An arcuately recessed engagement face 46a abutting on and engaged with the locking face 45a from backward to mechanically lock the advancing operating position of the parking piston 33 is formed in a lock part 46 provided in the lock piston 44. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |