| 摘要 |
The invention relates to an automatically adjustable spacer for a drum brake, comprising essentially a first part (10) bearing at one of its ends on a first shoe (3), a second part (16) bearing at the opposite end on the second shoe (2), the first and second parts (10, 16) being mounted slidably longitudinally relative to one another, a locking element (30), at least part of the periphery of which has a toothing, mounted movably on one of the first and second parts and capable of meshing with a corresponding toothing (28) provided opposite it on part of the periphery of the other of the first and second parts, so as to define a device for the automatic extension of the spacer as a function of the wear of the friction elements. The locking element (30) which is mounted movably in terms of rotation about a pin (32) and pin being mounted movably in terms of longitudinal translational motion in a slot provided in the part (10), is in form of a toothed cam the rotational movement of which results in an increase of the distance between the pin (32) and the meshing zone of the toothings, and a spring imparts a rotational movement to the locking element as soon as the toothing no longer mesh with one another.
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