| 摘要 |
PROBLEM TO BE SOLVED: To reduce further reduction of loss torque.SOLUTION: Each of segments becoming a low pressure region is prevented from being communicated to each other while polishing straps 71f are being communicated with an outer peripheral high pressure region. With such a configuration as above, since the polishing straps 71f are communicated with the outer peripheral high pressure region showing a discharging pressure, high pressure brake liquid is fed into the polishing straps 71f. Due to this fact, it is possible to get a pushing-back effect for pushing back a gear pump on the basis of high brake liquid pressure. In addition, since each of the segments becoming low pressure regions 71fa is not communicated to each other while the polishing straps 71 are being communicated with outer peripheral high pressure regions 71fb, it is possible to keep an inside segment of the polishing straps 71f under high pressure state, and it is also possible to restrict reduction of the pushing-back effect. Accordingly, it is possible to prevent an effect of reduction of loss torque from being reduced and it becomes possible further to reduce loss torque.SELECTED DRAWING: Figure 6 |
