| 摘要 |
This invention relates to a hydraulic system for machine tool operation which limits deflection of a stop at the end of machine tool travel. The hydraulic system includes a cylinder, a piston, a fluid line connected to one end of the cylinder, with the fluid lines being alternately pressure and exhaust lines. Fluid under pressure is introduced alternately in one of the fluid lines for moving either a piston or a cylinder housing relative to the piston and a means for reversing fluid flow in the lines acts to move either the piston or cylinder housing back and forth. Maximum flow pressure is maintained in one of the fluid lines when used as a pressure line, and a minimum fluid pressure is maintained in one of the fluid lines when used as an exhaust line. The cylinder housing includes a stop whereby said minimum fluid pressure on one side of the piston acts against the maximum fluid pressure on the other side of the piston for limiting deflection of the stop.
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