| 摘要 |
<P>PROBLEM TO BE SOLVED: To smoothly protrude and retreat a piston in a lost motion. <P>SOLUTION: A cab tilting device is equipped with a cylinder device for tilting which is installed between a cab 1 and a frame to tilt the cab, a raising side oil path for supplying/discharging a hydraulic oil to a raising side hydraulic chamber 5a of a cylinder chamber 92, a lowering side oil path for supplying/discharging the hydraulic oil to a lowering side hydraulic chamber 5b, and communication piping for communicating the raising side hydraulic chamber 5a and the lowering side hydraulic chamber 5b with each other. A communication port 5c in the cylinder chamber 92 of the communication piping is composed of a plurality of small holes 101. The group of the small holes 101 is displaced on a cylinder body 91 at an interval in the peripheral direction, opened passing through in the radial direction, a collar 102 is fitted to an outer periphery of the cylinder body 91, an annular band grooves 103 are recessedly provided in the inner periphery of the collar 102 so as to surround the group of small holes 101, and the annular band grooves 103 are communicated to the communication piping. Pressure loss of the communication port can be reduced, and therefore the protrusion and retreat in the lost motion can be smoothly performed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
