JPS61205828U

JPS61205828U -

Info

Publication number: JPS61205828U
Application number: JP1985090530U
Authority: JP
Priority date: 1985-06-14
Filing date: 1985-06-14
Publication date: 1986-12-25
Also published as: JPH0413241Y2

Description

[Brief explanation of the drawing]

図面は本考案の実施例を示す動力伝達及び油圧
操作系統を示す説明図である。１：エンジン、３：カウンタ、４：カウンタプ
ーリ、４ａ：可変プーリ、３１ａ，３１ｂ：前後
進クラツチ操作回路、３２：クラツチ軸、３３：
ブレーキ装置、３４，３４ａ，３４ｂ：ブレーキ
操作回路、３５：変速操作バルブ、３６：オイル
タンク、３７：主操作回路、３８：油圧ポンプ、
３９：ドレン管、４０：リリーフ弁、４１：開放
回路、４１ａ：ドレン管、４１ｂ：可変ドレン管
、４２：解除操作部、４３：解除バルブ、４４：
可変しぼり弁、４５：フイルタ、４６：連動手段
。 The drawing is an explanatory diagram showing a power transmission and hydraulic operation system according to an embodiment of the present invention. 1: Engine, 3: Counter, 4: Counter pulley, 4a: Variable pulley, 31a, 31b: Forward/reverse clutch operation circuit, 32: Clutch shaft, 33:
Brake device, 34, 34a, 34b: Brake operation circuit, 35: Speed change operation valve, 36: Oil tank, 37: Main operation circuit, 38: Hydraulic pump,
39: Drain pipe, 40: Relief valve, 41: Open circuit, 41a: Drain pipe, 41b: Variable drain pipe, 42: Release operation section, 43: Release valve, 44:
Variable throttle valve, 45: filter, 46: interlocking means.

Claims

[Scope of Claim for Utility Model Registration] 1. A shift operation valve for switching between forward/reverse and neutral is provided in the hydraulic operation circuit that controls the traveling shift, and when the shift operation valve is operated to the neutral position, the brake device is activated. In a work vehicle equipped with hydraulic piping for braking, the hydraulic operating circuit is provided with an open circuit, and the open circuit is provided with a release operating section for releasing the brake operating pressure of the hydraulic operating circuit. Brake control device in cars. 2. A brake control device for a working vehicle as set forth in claim 1 of the utility model registration claim, in which the release operation section has a variable throttle valve. 3. The brake control device for a working vehicle according to claim 1, wherein the release operation section is configured to include a solenoid valve, and the solenoid valve is configured to be linked with the operation to place the traveling section in a state where no braking is required. 4. Utility model registration claim Paragraph 1, in which the variable throttle valve is configured to reduce the throttle in a high speed state and increase the throttle in a low speed state by electrical or mechanical means depending on the speed control state of the traveling section. A brake control device for a work vehicle according to item 2 or 3.