Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Patent
1988-03-01
1989-05-09
Butler, Douglas C.
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
18832111, 18832217, 18832212, 18832219, 267 34, 2671661, 280668, 280701, B60G 1300, F16F 700, F16F 900
Patent
active
048282375
ABSTRACT:
A reduced length hydraulic shock absorber, preferably for use in a MacPherson strut, does not sacrifice structural rigidity under radial loads. A circumferential sleeve member is attached to the cylinder adjacent the end of the cylinder from which the piston rod extends. The piston rod extends through an opening in the sleeve end with a bearing therein. The sleeve telescopes axially on the cylinder. The sleeve is spring-biased axially outwardly of the cylinder, and is telescoped outwardly from the cylinder at all times except when the shock absorber is fully or mostly compressed. The sleeve, when telescoped outwardly, thus provides radial load bearing support for the piston rod at a point spaced apart from the cylinder end. This allows the shock absorber to be designed without any piston rod/cylinder overlap, and the piston rod may consequently be made shorter. The cylinder end bearing and the piston/cylinder wall bearing may also be reduced in thickness, since less radial force is transmitted by these bearings because the piston rod is shorter and provides a shorter moment arm and because the sleeve end bearing transmits some of the radial force which would otherwise be transmitted solely by these two bearings. Together, these length reductions allow a desired reduction in the maximum overall length of the shock absorber.
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Butler Douglas C.
TRW Inc.
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