JPS61114076U

JPS61114076U -

Info

Publication number: JPS61114076U
Application number: JP19681184U
Authority: JP
Priority date: 1984-12-28
Filing date: 1984-12-28
Publication date: 1986-07-18

Description

[Brief explanation of the drawing]

図面はこの考案の一実施例を示し、第１図は断
面図、第２図イ及びロ、第３図イ及びロは補助ス
プールの他の実施例を示す側面図及び端面図、第
４図は特性を示す線図、第５図及び第６図は従来
の斜板制御装置の説明図である。２はサーボピストン、４は中立ばね、７は支持
筒、７ｃは圧力室、８は補助スプール、８ａは通
路、１０はレバ、１２はピストン、１３は切換え
弁スプール。 The drawings show one embodiment of the invention, and FIG. 1 is a cross-sectional view, FIG. 2 A and B, FIG. 3 A and B are a side view and end view showing another embodiment of the auxiliary spool, and FIG. is a diagram showing characteristics, and FIGS. 5 and 6 are explanatory diagrams of a conventional swash plate control device. 2 is a servo piston, 4 is a neutral spring, 7 is a support cylinder, 7c is a pressure chamber, 8 is an auxiliary spool, 8a is a passage, 10 is a lever, 12 is a piston, and 13 is a switching valve spool.

Claims

[Scope of utility model registration request]

The swash plate angle of the hydraulic piston motor is controlled by a servo piston 2 operated by servo pressure via a lever 10 and a piston 12, and an end of the lever 10 opposite to the piston 12 is supplied to the piston 12. In the one in which the spool 13 of the switching valve for switching the hydraulic pressure is engaged, one end is in contact with the end surface of the servo piston 2, and the other end is in the vicinity of the neutral spring 4 that biases the servo piston 2 in the neutral direction. An auxiliary spool 8 facing the pressure chamber 7c into which neutral oil pressure is introduced when the servo piston 2 is neutral.
and the pressure chamber 7 of the auxiliary spool 8.
A swash plate control device for a hydraulic piston motor, which is provided with a passage 8a at the c-side end that opens when the servo piston 2 reaches the neutral position to release the neutral hydraulic pressure in the pressure chamber 7c.