| 摘要 |
<p>A rotary blower (26) of the type used for supercharging a vehicle internal combustion engine includes an inlet housing (48) defining an inlet port (30) and an outlet port (34). The blower housing defines a bypass passage (38), through which outlet port fluid is bypassed back to the inlet port (30) whenever supercharging of the engine is not needed. The blower housing also defines a bypass bore (52) open to the exterior of the housing and intersecting the bypass passage (38). A bypass module (54) is disposed within the bypass bore (52) and includes a housing assembly (55). Within the bypass module (54) is a bypass valve member (92) which, in the subject embodiment, includes a cam portion (96), whereby the bypass valve (92) may be actuated by axial movement of a diaphragm (64) and a lever (74). The bypass module (54) cooperates with the housing (48) to define a retention arrangement (100-106), whereby the module is merely inserted into the bore (52), rotated to its assembled position (FIG. 3), and then appropriate vacuum and pressure lines are connected to one or both of a vacuum port (60) and a pressure port (62). The bypass module (54) of the invention provides a simple, inexpensive bypass valve arrangement which substantially reduces the cost of machining of the inlet housing (48), while reducing the time and cost of assembly. <IMAGE></p> |
