| 摘要 |
A rack and pinion steering gear assembly has a rack bar 5 displaceable through a cylindrical bush 7 secured by a pin 38 in a rack bar housing 11. A flexible concertina-type bellows 21 is provided between the housing 11 and a tie rod on the end of the rack bar. The bush 7 has an annular recess 42 which is in constant communication by way of longitudinal grooves 39 in the surface of the bush with the interior of the bellows 21. The recess 42 coincides with an aperture 43 in the housing wall 11 within which is snap fitted a tubular plug 44 through which the bellows 21 breathes by way of the recess 42 and grooves 39. The bellows 21 can breathe through the plug 44 to atmosphere (preferably by way of a filter) or by way of a pipe to the interior of bellows located at the opposite end of the rack bar. The bush 7 can partly define a pressure chamber 23 of a piston and cylinder unit for power assisted steering.
|
