| 摘要 |
<p>1,084,575. Telescopic shock absorbers. ARMSTRONG PATENTS CO. Ltd. Oct. 13, 1965 [Oct. 20, 1964], No. 42641/64. Heading F2S. A telescopic hydraulic shock-absorber comprising a piston 14 which works in a cylinder 10 coaxially enclosed within an outer cylinder 12 to define an annular reservoir space 28 and a valve system which ensures a unidirectional flow of hydraulic fluid during operation is characterized in that the cylinders 10, 12 are closed and joined at one end by a rod guide 18 through which a piston rod 16 passes and at the other end by a plug member 22, the piston 14, the rod guide 18, and the plug member 34 being ported and the flow of fluid being controlled in each instance by an annular disc valve 50, 40 or 34 at least one of which is pre-tensioned to determine the damping characteristic of the shock-absorber. The disc valve 40 is loaded by a spring 42 and controls ports 38 in the piston 14, and the valve 34 is loaded by a spring 36 and controls ports 30, 32 in the plug member 22, the valve 50 being in the form of a diaphragm which is clamped between the rod guide member 18 and the cylinder 10 and which overlies an annular groove 48 formed in the member 18. The groove 48 communicates with three, or more, equiangularly-spaced grooves 46 formed in a spigot portion 44 of the member 18. An anti-foam sleeve 52 co-operates with the cylinder 10 to define an annular space 54 for the reservoir air or gas and is formed with an inclined shoulder 56 which is secured to the cylinder 10 and which co-operates with the guide member 18 and the cylinder 12 to form a chamber 58 for receiving the fluid discharged from the valve 50. Fluid flows from the chamber 58 to the reservoir 28 through a narrow annular passage 60 between the sleeve 52 and the cylinder 12. A port 53 in the sleeve 60 limits the level of fluid within the space 54. The diaphragm valve (50) is pretensioned by offsetting the outer margin (19) of the groove (48), which is provided with a shallow bleed notch (19a), Fig. 3 (not shown), the end (11) of the cylinder (10) which abuts the diaphragm (50) being radially inwardly-chamfered at a small angle. The shoulder 56 on the sleeve 52 can be replaced by a stepped flange (62), Fig. 4 (not shown), or by a rounded rim (64), Fig. 5 (not shown).</p> |
