JPH0418772U

JPH0418772U -

Info

Publication number: JPH0418772U
Application number: JP6075390U
Authority: JP
Priority date: 1990-06-08
Filing date: 1990-06-08
Publication date: 1992-02-17
Anticipated expiration: 2005-06-08
Also published as: JP2516021Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の一部切断正面図、
第２図は第１図の−矢視図、第３図は第１図
の−矢視図、第４図は第１図の−矢視図
、第５図は第１図の−矢視図、第６図は第１
図の−矢視図、第７図は第１図の−矢視
図、第８図は回動スリーブ３４の展開図、第９図
イ，ロは本考案の一実施例の油圧回路図、第１０
図は本考案の一実施例を適用したバツクホーの油
圧系統図、第１１図イ，ロは操作レバー６の操作
パターンを説明するための平面図、第１２図は従
来のバツクホーの油圧系統図、第１３図は４方向
切換バルブ１の油圧回路図、第１４図はロータリ
切換弁２の一部切断正面図、第１５図は第１４図
の−矢視図、第１６図は第１４図の
−矢視図、第１７図はロータリ切換弁２の油
圧回路図である。図中１は４方向切換バルブ、５はバルブ本体、
６は操作レバー、７，８，９，１０は切換弁、３
０は固定ブロツク、３４は回動スリーブ、Ｒ１，
Ｒ２，Ｒ３，Ｒ４は選択ポート、Ｐはポンプポー
ト、Ｔはタンクポート、Ｕ１，Ｕ２，Ｕ３，Ｕ４
は切換ポート、Ｗｐは入側ポート、Ｗｔは出側ポ
ートを示す。 FIG. 1 is a partially cutaway front view of an embodiment of the present invention;
Figure 2 is a view in the - arrow direction of Figure 1, Figure 3 is a - arrow view in Figure 1, Figure 4 is a - arrow view in Figure 1, and Figure 5 is a - arrow view in Figure 1. Figure 6 is the first
FIG. 7 is a view in the direction of the − arrow in FIG. 1, FIG. 8 is a developed view of the rotating sleeve 34, and FIGS. 10th
The figure is a hydraulic system diagram of a backhoe to which an embodiment of the present invention is applied, FIGS. 11A and 11B are plan views for explaining the operation pattern of the operating lever 6, and FIG. 13 is a hydraulic circuit diagram of the four-way switching valve 1, FIG. 14 is a partially cutaway front view of the rotary switching valve 2, FIG. 15 is a view taken in the direction of the - arrow in FIG. 17 is a hydraulic circuit diagram of the rotary switching valve 2. In the figure, 1 is a 4-way switching valve, 5 is a valve body,
6 is an operating lever, 7, 8, 9, 10 are switching valves, 3
0 is a fixed block, 34 is a rotating sleeve, R1,
R2, R3, R4 are selection ports, P is pump port, T is tank port, U1, U2, U3, U4
indicates a switching port, Wp indicates an input port, and Wt indicates an output port.

Claims

[Scope of utility model registration request]

The valve body 5 is equipped with switching valves 7, 8, 9, and 10, and the lower surface of the valve body 5 is equipped with a pump port P, a tank port T, and a plurality of selection ports R1, R.
By opening 2, R3, and R4 and tilting the operating lever 6 provided at the upper end of the valve body 5 in the front-rear direction, the switching valves 7 and 8 open, and the selection ports R1 and R3 are connected to the pump port P. The selection ports R3 and R1 communicate with the tank port T, and by tilting the operating lever 6 in the left and right direction, the switching valves 9 and 10 open, and the selection ports R2 and R4 communicate with the pump port P. , in a four-way switching valve configured such that selection ports R4 and R2 communicate with tank port T, a fixed block 30 attached to the lower surface of valve body 5 can communicate with pump port P and tank port T,
The inlet port Wp and the outlet port Wt penetrating from the upper end surface to the lower end surface of the fixed block 30 can communicate with the selection ports R1, R2, R3, and R4,
In addition, upper ports G1, G2, G3, and G4 penetrate from the upper end surface of the fixed block 30 to the outer peripheral surface, and upper ports G1, G2, G3, and G4 are located below the upper ports G1, G2, G3, and G4, and extend from the outer peripheral surface of the fixed block 30 to the lower end surface. Lower ports H1, H2, H3, and H4 penetrating through the fixed block 30 are provided with lower ports H1, H2, H3, and H4.
4 is slidably fitted in the circumferential direction, and when the rotary sleeve 34 is rotated to a predetermined position, the lower ports H1, H2, H3, and the upper ports G1, G2, G3, and G4 are fitted. When H4 and the rotating sleeve 34 are rotated to a position different from the rotational position, the lower ports H1, H2, H3, and H4 are communicated with the upper ports G1, G2, G3, and G4. A four-way switching valve characterized in that switching channels M1, M2, M3, and M4 are formed on the inner circumferential surface of the rotary sleeve 34.