| 摘要 |
A rocker arm (10) that reduces frictional forces between a cam (86) and the rocker arm (10) is disclosed. The rocker arm (10) includes a pair of spaced side members (20) having a valve portion (14), a middle portion (16), and a pivot portion (12). The side members (20) of rocker arm (10) each define a downwardly extending tappet hole (49) located generally centrally within the valve portion (14). The middle portion (16) of each side member (20) defines a bearing hole (68), and each of the pivot portions (12) defines a pivot hole (66). A web (70) extends between side members (20) at a valve portion (14) and at the pivot portion (12), defining a recess (85) therebetween at about the middle portion (16). A pin bearing is located within the bearing holes (68) and passes through the recess (85). An annular striking member (80) is located within the recess (85) and rotatably engages the pin bearing (69). During operation, a cam (86) is placed in operative contact with striking member (80). Rotation of cam (86) depresses striking member (80) and, in turn, rocker arm (10), while frictional forces from the cam cause the striking member (80) to rotate.
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