| 摘要 |
PURPOSE:To reduce the load of a solenoid-valve fixing means by reducing the pressure receiving area of the solenoid valve which receives the oil pressure in a high-pressure oil passage formed onto a supporting board, thus exceedingly reducing the thrust load of the solenoid valve due to the above-described oil pressure. CONSTITUTION:The lower edge of the valve cylinder 4 of each solenoid valve 2f, 2r is fitted in oil-tightly through a sealing ring 13 onto a supporting hole 12 on a supporting board 1. The projecting shaft 8 on the lower edge surface of the solenoid valve is fitted through a sealing ring 14 into a high-pressure oil passage Lh opened at the center part of the bottom surface of the supporting hole 12. An annular oil chamber 15 surrounding the projecting shaft 8 is formed in each supporting hole 12, and the outlet of an inlet valve communicates to the control oil passages Lrf and Lrr communicating to a decompression control chamber. The pressure receiving area A1 of the projecting shaft 8 close to the high-pressure oil passage is set smaller than the pressure receiving area A2 of the solenoid valve close to the annular oil passage 15. The flange 19 of the valve cylinder 4 is fitted into the cut part 17 on the supporting board 1, and pressed onto the supporting board 1 by a pressing plate 20 tightened by a bolt 24. |
