| 摘要 |
A brake lever for an automotive S-cam drum brake (1-3) has a worm wheel (12) for attachment to an S-cam shaft (5) and meshing with a worm screw (20) on a worm screw shaft (19), and a control arrangement (13, 14, 18, 25) including a control ring (25) rotatable on the worm screw shaft (19).
<??>In a force transmitting chain between the control ring and the worm screw shaft there is a clutch sleeve (26), a one-way clutch (28), a clutch ring (27) and a torque limiting clutch (32) biased into engagement by a strong spring (22) on the worm screw shaft, a control distance (A) in the form of a circumferential play being formed between the control ring and the clutch sleeve, which are biased towards a predetermined initial relative circumferential position by a spring (33). |
