| 摘要 |
1,273,292. Shaft seals. FEDERAL-MOGUL CORP. 8 May, 1970 [30 July, 1969], No. 22433/70. Heading F2B. A seal for a rotary shaft subject to some reciprocation, as in the rear transmission in a motor vehicle comprises a metal casing 13 which supports an elastomeric shaft seal element 23 and, by means of concentric cylindrical walls 14, 20, frictionally-retains the end portion 30 of a sealing boot which is provided with an axially. collapsible sleeve portion 31 and an end portion 32 which lightly-engages the shaft. The casing is a press-fit in a housing 16 and the seal engages a shaft sleeve 47 which rotates with a splined drive shaft 48 and a universal joint member 50. The seal element 23 is moulded to the casing flange 22 and comprises a spring-pressed lip 24 and a dust-excluding lip 25. In the event of the universal joint member 50 moving closer to the housing 16, the wall 51 of the member engages the end face of the boot and pushes it towards the housing causing the sleeve portion 31 to fold adjacent a rib 42 as shown in Fig. 7. The end portion of the boot may have a separate ring of metal or plastics bonded into a recess.
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