| 摘要 |
<p>PURPOSE:To obtain a servo device of low cost excellent in responsibility by providing two chambers for stroke and pressing use and drain holes for independently draining oil of the respective chambers. CONSTITUTION:Oil in the first chamber 57 is drained passing through an apply pressure oil hole 56a, and oil in the second chamber 59 is drained passing through an apply rod check valve 70 and drain holes 53d, 51a. Thus, both the chambers 57, 59, having the independent drain holes 56a, 53d, 51a, surely release a brake drum 5. In this way, by providing the two chambers 59, 57 for stroke and pressing use and the drain holes 56a, 53d, 51a for independently draining oil in the respective chambers 59, 57, quick engagement and release can be performed absorbing unevenness of an apply rod 53 in its stroke caused by wearing of a friction material and dispersion or the like in accuracy of parts.</p> |
