JPS6322474U

JPS6322474U -

Info

Publication number: JPS6322474U
Application number: JP11642986U
Authority: JP
Priority date: 1986-07-28
Filing date: 1986-07-28
Publication date: 1988-02-15

Description

[Brief explanation of drawings]

第１図は、この考案を実施した減圧弁の一実施
例を示す断面図、第２図は、この考案を適用した
舶用油圧式減速逆転機の油圧回路図、第３図は、
溝勾配の小さい方の逃がし溝を選択した場合の減
圧弁の横断面図、第４図は、制御ピストン体の一
端側の展開図、第５図は、第１図のＡ―Ａ線断面
図、第６図は、溝勾配の大きい方の逃がし溝を選
択した場合の減圧弁の横断面図、第７図は、この
実施例によつて得られる油圧特性を示すグラフ、
第８図は、従来例を示す断面図、第９図は、同じ
く制御ピストン体の一端側の展開図である。１…弁本体、２…制御レバー軸、３…制御ピス
トン体、８…減圧弁部材、１０…制御油圧ポート
、１２…調圧ばね、１３…制御油圧室、１６…ド
レンポート、２５，２６…逃がし溝。 Fig. 1 is a sectional view showing an embodiment of a pressure reducing valve implementing this invention, Fig. 2 is a hydraulic circuit diagram of a marine hydraulic reduction/reversing machine to which this invention is applied, and Fig. 3 is a
A cross-sectional view of the pressure reducing valve when a relief groove with a smaller groove slope is selected, FIG. 4 is a developed view of one end side of the control piston body, and FIG. 5 is a cross-sectional view taken along the line A--A in FIG. 1. , FIG. 6 is a cross-sectional view of the pressure reducing valve when the relief groove with the larger groove slope is selected, and FIG. 7 is a graph showing the hydraulic characteristics obtained by this embodiment.
FIG. 8 is a sectional view showing a conventional example, and FIG. 9 is a developed view of one end side of the control piston body. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Control lever shaft, 3... Control piston body, 8... Pressure reducing valve member, 10... Control hydraulic port, 12... Pressure regulating spring, 13... Control hydraulic chamber, 16... Drain port, 25, 26... escape groove.

Claims

[Scope of Claim for Utility Model Registration] A valve member that is slidably installed inside the valve body, and a control that is also slidably installed inside the valve body and is rotatably provided through the valve body inwardly and outwardly. A control piston body that is slidably attached to the lever shaft only in the axial direction, a control hydraulic chamber disposed on one axial side of the control piston body, and a control hydraulic chamber that faces the peripheral wall surface of the control piston body. A drain port provided in the valve body, a relief groove provided in the control piston body to allow hydraulic oil in the control hydraulic chamber to escape to the drain port, and an intermediary between the valve member and the control piston body. and a pressure regulating biasing means installed therein, by rotating the control lever shaft, the depth of the relief groove, which is in the same phase as the drain port of the valve body, is adjusted in the axial direction. By changing the pressure, the communication state between the relief groove and the drain port is changed to a position where the urging force of the pressure regulating urging means and the pressing force of the hydraulic oil pressure of the control hydraulic chamber are balanced. By moving the control piston body, the pressing force acting on the valve member through the pressure regulating biasing means is changed, thereby regulating the pressure of the hydraulic oil on the main passage side. In the control piston body, a plurality of relief grooves are formed on the peripheral wall surface of the control piston body, and the relief grooves have different ratios of change in depth with respect to a rotational change per unit in the circumferential direction of the control piston body, and are arranged at different phases in the circumferential direction. A hydraulic adjustment device characterized in that it is formed by: