JPS62122905U

JPS62122905U -

Info

Publication number: JPS62122905U
Application number: JP959586U
Authority: JP
Priority date: 1986-01-28
Filing date: 1986-01-28
Publication date: 1987-08-04
Also published as: JPH0349283Y2

Description

[Brief explanation of the drawing]

第１図ないし第３図は本考案の実施例を示す図
で、第１図はその第１の実施例の説明図、第２図
は切換弁の絞りの出力ポートをタンクに接続した
第２の実施例の説明図、第３図は切換弁を３位置
としＳＴＯＰ位置を設けた第３の実施例の説明図
である。第４図は従来の油圧駆動車両の走行油圧
回路例の説明図である。１……エンジン、２……油圧ポンプ、３……方
向制御弁、４……油圧モータ、５……カウンタバ
ランス弁、１０……タンク、１７，１８，１９…
…切換弁。 1 to 3 are diagrams showing embodiments of the present invention. FIG. 1 is an explanatory diagram of the first embodiment, and FIG. 2 is an explanatory diagram of the first embodiment, and FIG. FIG. 3 is an explanatory diagram of a third embodiment in which the switching valve is in three positions and a STOP position is provided. FIG. 4 is an explanatory diagram of an example of a travel hydraulic circuit for a conventional hydraulically driven vehicle. DESCRIPTION OF SYMBOLS 1... Engine, 2... Hydraulic pump, 3... Directional control valve, 4... Hydraulic motor, 5... Counter balance valve, 10... Tank, 17, 18, 19...
...Switching valve.

Claims

[Scope of Claim for Utility Model Registration] 1. A hydraulic pump driven by an engine, a direction control valve that controls the flow of pressure oil discharged from the hydraulic pump and determines the forward and backward direction of the vehicle, and a hydraulic motor driven by pressure oil;
In a traveling hydraulic circuit of an open-circuit hydraulically driven vehicle, which includes a counterbalance valve that is interposed between a hydraulic motor and the directional control valve and is switched by pressure oil sent from the directional control valve, the hydraulic motor is operated when the vehicle is running. A traveling hydraulic circuit for a hydraulically driven vehicle, characterized in that a switching valve provided with a restriction that limits the flow rate of discharged oil is interposed in a circuit between a hydraulic motor and a counterbalance valve. 2. A hydraulically driven vehicle according to claim 1, wherein the switching valve is provided with an OFF position that communicates with the hydraulic motor and the counterbalance valve, and an ON position that communicates with the hydraulic motor through a throttle. travel hydraulic circuit. 3. A request for registration of a utility model characterized in that the switching valve is provided with an OFF position that communicates with the hydraulic motor and the counterbalance valve, and an ON position that communicates with the hydraulic motor through a throttle, and that the ON position is connected to the tank. A travel hydraulic circuit for a hydraulically driven vehicle according to scope 1. 4. Registration of a utility model characterized in that the switching valve is provided with an OFF position where the hydraulic motor and the counterbalance valve communicate with each other, an ON position where the hydraulic motor and the counterbalance valve communicate with each other through a throttle, and a cutoff position where the entire flow is throttled and communication is cut off. A traveling hydraulic circuit for a hydraulically driven vehicle according to claim 1.