| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wheel cylinder structure of a drum brake in which the piston pressing force of a rear wheel cylinder is reduced to prevent a rear tire from being locked in an initial braking stage when a brake is suddenly applied. SOLUTION: In a wheel cylinder structure of a drum brake to control a brake shoe of a drum brake 1 by pressing the brake shoe against an inner surface of the drum by the action of the piston of a wheel cylinder 5, the piston in a pressure chamber to be operated with the pressure comprises a large diameter piston 8 and a small diameter piston 7, and the braking effect in the initial braking stage is reduced by providing the time difference between the operation of the large diameter piston 8 and the small diameter piston 7.</p> |
