| 摘要 |
A pivot bearing, e.g. for a vehicle trailing arm suspension, comprising a housing (4), a resilient bush (3), preferably compressed and bonded in the housing, and a rigid axial sleeve (2) in the bush, has voids, (9) formed in the bush to be above and below the sleeve when the pivot bearing is fitted for use, and there are stiffening elements (17) in the bush which extend between the voids (9) at opposite sides of the sleeve. When the pivot bearing is in use in a vehicle trailing arm suspension, the voids increase flexibility of the bush under generally vertical loading on the pivot bearing and the stiffening elements enhance the stiffness of the bush in generally horizontal direction for improved vehicle dynamics and reduced vibration. Preferably the siffening elements (17) are of plate or leaf form are bonded to the bush and extend arcuately about the sleeve, and the voids (9), which may extend partially through the axial thickness of the bush from opposite ends of the bush, extend generally accurately about the sleeve (2) and have enlarged opposite circumferential end portions (13). The end portions (13) extend circumferentially beyond diametrically opposite parts of the external circumference of the sleeve and are in-turned towards the sleeve. Edges (18) of the stiffening elements may extend into the opposite end portions (13) of the voids.
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