| 摘要 |
A compressor for a vehicle air conditioning system comprises a casing (10) in which is mounted a swash or wobble plate arrangement operatively connected to a drive shaft and a plurality of pistons (14) each provided with a piston body (7, 18) at one end and a foot portion (20) at its other end. A cylinder block (25) is also provided defining a plurality of cylinder bores (19) equally distributed circumferentially around the drive shaft, in each of which bores (19) one of the piston bodies (17, 18) can be reciprocated by the swash or wobble plate as the drive shaft rotates. The invention is characterised in that the inner wall surface (13, 15) of the casing (10) defines a plurality of longitudinally extending recesses (13) in positions apposed to each piston (14). The piston body (17, 18) and the foot portion (20) of each piston (14) are connected by a bridge (16) that is bending resistant and that is enlarged to project outwardly into these apposed recesses (13). Also, at least one side of the piston (14) is provided with a projecting wing (22) that supports the piston (14) against the adjacent inner wall surface (15) of the casing (10) to one side of the recess (13). The casing (10) and the pistons (14) are thus designed for mutual interengagement. Also, in the piston (14) the requirement to provide a bending resistant portion has been divided away from the requirement to provide an anti-rotation locking arrangement. <IMAGE>
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