| 摘要 |
PCT No. PCT/JP95/02701 Sec. 371 Date Jun. 20, 1997 Sec. 102(e) Date Jun. 20, 1997 PCT Filed Dec. 26, 1995 PCT Pub. No. WO96/20355 PCT Pub. Date Jul. 4, 1996A braking apparatus for a hydraulic motor has a housing and a cylinder block. The apparatus includes fixed side frictional plates mounted to the housing and movable side frictional plates mounted to the cylinder block. In addition, a piston for pressing the fixed side frictional plates against the movable side frictional plates is also provided. A spring for thrusting the piston to move in a first direction thus tending to establish a first state in which the two sets of frictional plates are pressed together is also included. Furthermore, the apparatus includes a piston driving pressure receiving chamber disposed between the housing and the piston for thrusting the piston to move in a second direction under a pressure that is introduced into the piston driving pressure receiving chamber to establish a second state in which the two sets of frictional plates are separated from each other. The apparatus also includes a stopper for regulating a space between the fixed side frictional plates and the movable side frictional plates while the piston is moving in the second direction. In addition, the piston is movable in the second direction a distance that is greater than the size of the space.
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