| 摘要 |
<p>An automatic adjuster for an internal shoe drum brake includes a strut (30) comprising three coaxial members, a first end member (31) being interconnected with an intermediate member (29) by means of inter-engaging thread formations (33, 34) and a second end member (35) being slidingly interconnected to the intermediate member (29) and free to rotate relatively thereto; a sleeve member (40) is mounted for rotation on the intermediate member (29) and is located axially with respect thereto; a ratchet wheel (42) is provided on the intermediate member (29) for rotation therewith, between said second member (35) and sleeve member (40); a leaf spring (50) acts between said second end member (35) and sleeve member (40), the spring member (50) engaging at each end an undercut transverse face (47, 48) and axially extending faces of formations (45, 46) provided on the second end member (35) and sleeve (40), to provide axial and rotational location of the spring, said spring (50) having a pawl formation (55) which engages the ratchet wheel (42) and upon movement apart of the second end member (35) and intermediate member (29) will cause the ratchet wheel (42) to rotate.</p> |
