| 摘要 |
<p>PURPOSE:To improve operational responsibility by thrusting a free piston of an accumulator with a piston of a starting cylinder at the time of starting the operation to change from static friction to dynamical friction. CONSTITUTION:When a motor 20 is started to locate a valve 30 at a neutral position and a valve 31 is switched so that the pressure of a passage 46 is high and the pressure of a passage 45 is low, a piston 13 of a starting cylinder 12 moves downward to thrust a free piston of an accumulator 10. The pressure in an oil chamber 46 is sent to a cylinder 1. Before the cylinder 1 is extended to a neutral position, pressure oil stays in the accumulator, and the piston 11 causes a metal contact due to a break in an oil film, so that the piston 13 generates large static frictional force at the time of starting to move. In this case, the free piston 11 is pushed up with a little stroke by the thrust action of the piston 13 of the cylinder 12 at the initial stage of operation, so that the free piston 11 starts to move smoothly, and the piston 11 smoothly operates with good responsibility.</p> |
