| 摘要 |
A suspension strut assembly has an upper mount and jounce bumper assembly (32) which incorporates an elastomer bushing (60) operatively connecting the piston rod (28) of the suspension strut (10) to support structure (31), and works in shear during initial jounce travel but is subject to compression load build-up towards the limit of mount travel. The upper mount and jounce bumper assembly (32) is a unitized multi-element construction having a jounce bumper (40) to provide a load path for suspension spring assist and a load-deflection curve effective to improve suspension characteristics. Load build-up is achieved in jounce and rebound with the use of a rate washer (56) which is moved upwardly by the strut piston rod in jounce movement. Initial travel works the elastomer bushing (60) in shear, but the elastomer subsequently becomes compressed between the rate washer and an outside metal wall (67) to provide an increasing spring rate. When the piston rod moves vertically downwardly in rebound, the rate washer controls the load build-up and compresses the upper portion (50) of the jounce bumper for soft entry into rebound. |
