| 摘要 |
1,160,373. Fluid-pressure motors; cushioning. P.L. PANIGATI. Oct.26, 1966 [Nov. 2, 1965], No. 47944/66. Heading F1P. A fluid-pressure motor includes a cylinder 2 containing a piston 5 attached to a shaft 4 that extends through a cylinder-head 1, which together with the shaft defines an annular passage 7 communicating with a port 8 for working fluid, e.g. compressed air, cushioning for the piston being effected by working fluid trapped between an annular portion 5b of the piston and a flexible diaphragm 10 when the piston approaches the cylinder-head. The diaphragm is attached to a sleeve 9 on the cylinder-head and abuts a porous annular-member 11 that serves to restrict the rate of flow of working fluid through at least one small hole 10c in the diaphragm into the passage 7 by way of an annular passage 12 and a plurality of holes 13 while the piston is approaching the end of its stroke in close proximity with the cylinder-head. When the flow of working fluid in the passage 7 is reversed, the diaphragm is deflected away from the number 11, Fig. 3 (not shown), so as to permit a relatively large rate of flow of working fluid therethrough and augment the thrust on the piston at the commencement of its return stroke. The sleeve 9 is screwthreaded to allow axial adjustment of the position of the diaphragm and the porous member and thereby vary the cushioning effect. A plurality of grooves 9a are formed in the outermost surface of the sleeve 9 to facilitate rotation thereof by a suitable tool inserted therein through a slot 15 in the cylinder. Materials of which the diaphragm, the porous member and the portion 5b of the piston may be made are synthetic or natural rubber, sintered bronze and a natural or synthetic polymer, respectively. |
