| 摘要 |
<p>A hydraulic control apparatus (10; 210) comprising a housing (70) including first sliding-related portions (100, 104); a piston assembly (72; 202) including second sliding-related portions (74, 140, 141; 200) which cooperate with the first sliding-related portions to provide pairs of first and second sliding-related portions; and elastically deformable sealing members (114, 92) each of which is supported by one of the first and second sliding-related portions of a corresponding one of the pairs, such that the each sealing member is slideable on the other of the first and second sliding-related portions. The pairs of first and second sliding-related portions and the sealing members cooperate with each other to separate an inner space of the housing into hydraulic chambers (150). When the piston assembly is moved in the housing in a movement direction, the each sealing member supported by the one of the first and second sliding-related portions is slid on the other of the first and second sliding-related portions, and a volume of each of the hydraulic chambers is changed. At least one pair of first and second sliding-related portions (104, 140, 141; 200) of the pairs of first and second sliding-related portions exhibits, when the piston assembly is positioned, in the movement direction, at different positions (140, 141; 200) relative to the housing, different resistances to the movement of the piston assembly relative to the housing. <IMAGE></p> |
