| 摘要 |
PROBLEM TO BE SOLVED: To secure the favorable sealing performance of a slide face between a chip seal and a base board part by stably securing a load in a radial direction, and accordingly stably securing a load in a tooth protrusion direction.SOLUTION: In a state that a seal low-pressure side external wall face 163 of a chip seal 16 is pressed against an accommodation groove low-pressure side internal wall face 114c of a seal accommodation groove 114, a low-pressure side clearance 53 into which the pressure Pof a low-pressure operation chamber 15b is introduced is formed between the seal low-pressure side external wall face 163 and the accommodation groove low-pressure side internal wall face 114c. By this constitution, the pressure Pof the low-pressure operation chamber 15b acts on the seal low-pressure side external wall face 163, the pressure Pof a high-pressure operation chamber 15a acts on a seal high-pressure side external wall face 162, and a force for pressing the seal low-pressure side external wall face 163 against the accommodation groove low-pressure side internal wall face 114c (that is, a load in a radial direction) can be stably secured. |
