JPH0313355U

JPH0313355U -

Info

Publication number: JPH0313355U
Application number: JP7252189U
Authority: JP
Priority date: 1989-06-20
Filing date: 1989-06-20
Publication date: 1991-02-12

Description

[Brief explanation of drawings]

第１図はこの考案にかかる振動抑制回路図、第
２図はホイールローダの側面図、第３図は従来技
術の振動抑制回路図である。５……ブームシリンダ、１０……負荷、１４…
…アキユムレータ、１６……開閉弁、１７……電
磁弁、１９……スイツチ、２２……ヘツド側油室
、３３……切換弁。 FIG. 1 is a diagram of a vibration suppression circuit according to this invention, FIG. 2 is a side view of a wheel loader, and FIG. 3 is a diagram of a vibration suppression circuit of the prior art. 5...Boom cylinder, 10...Load, 14...
...Accumulator, 16...Opening/closing valve, 17...Solenoid valve, 19...Switch, 22...Head side oil chamber, 33...Switching valve.

Claims

[Scope of utility model registration request]

The boom is rotatably mounted on the front part of the vehicle body by a boom cylinder, and a slow return valve and an on-off valve are connected in series and interposed in the oil passage that communicates the accumulator with the head side oil chamber in the boom cylinder. In a work vehicle in which the above-mentioned accumulator and the head-side oil chamber in the boom cylinder are communicated with each other by a switch operation to suppress vibration, the hydraulic pressure connected to the head-side oil chamber in the boom cylinder and the switching operation side pressure oil of the above-mentioned on-off valve are used. A switching valve is interposed in the oil passage connecting the working port, and when the accumulator and the boom cylinder head side oil chamber are in communication, the pressure in the boom cylinder head side oil chamber is used to control the flow between the accumulator and the boom cylinder. A vibration suppression circuit for a work vehicle, characterized in that the head side oil chamber is configured to be cut off by the conversion valve.