| 摘要 |
An adjuster for a strut (60) located between a first web (13) on a first brake shoe (12) and a second web (15) on a second brake shoe (14) for a drum brake (10). The strut (60) has a shaft (64) that is free to rotate in a first end member (62) and is threaded into the second end member (66). A lever arm (54) pivots during a brake application and engages a ratchet wheel (70) on the shaft (64) to rotates the shaft (64) and expand the strut (60) to maintain a minimum running clearance (C) with respect to a rotatable member (46). A bi-metal coil strip (94) that is fixed to the first end member (62) has a free end (96) that is aligned with the lever arm (54). The coil strip (94) responds to a predetermined temperature by moving the lever arm (54) away from the ratchet wheel (70) such movement of the lever arm (54) does not rotate the ratchet wheel (70) and expand the strut (60). Thus, on termination of a brake application a current running clearance (C) is sustained without being affected by the predetermined temperature.
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