JPH0250578U

JPH0250578U -

Info

Publication number: JPH0250578U
Application number: JP13056988U
Authority: JP
Priority date: 1988-10-04
Filing date: 1988-10-04
Publication date: 1990-04-09
Anticipated expiration: 2003-10-04
Also published as: JPH0616166Y2

Description

[Brief explanation of drawings]

第１図は本考案バルブの第１実施例を示す中央
縦断面図、第１ａ図はその油圧回路記号図、第２
図は本考案バルブの第２実施例を示す中央縦断面
図、第３図は本考案バルブの第３実施例を示す中
央縦断面図、第４図は第３図のアンロード回路部
の横方向断面図、第５図は従来の一連用セレクタ
バルブの中央縦断面図、第５ａ図はその油圧回路
記号図である。１，１′……スプール挿通孔、２，２′……ハ
ウジング、３，４……油圧シリンダ、５，５′…
…スプール、８，９……連通路、１１，１２……
プラグ、１３……アンロード弁、１４……弁ばね
、１５……チヨーク孔、６ａ……連通路、６ｂ…
…迂回路、Ａ，Ａ′，Ｂ，Ｂ′，Ｃ，Ｃ′，Ｄ，
Ｄ′……シリンダポート、Ｐ，Ｐ′……ポンプポ
ート、Ｔ_１，Ｔ′_１，Ｔ_２，Ｔ′_２……タンクポ
ート、Ｔ_３，Ｔ′_３……バイパス回路、Ｕ_１，Ｕ
′_１……第１アンロードポート、Ｕ_２……第２ア
ンロードポート、Ｕ……アンロード室。 Fig. 1 is a central vertical sectional view showing the first embodiment of the valve of the present invention, Fig. 1a is a symbol diagram of its hydraulic circuit, and Fig. 2
The figure is a central longitudinal cross-sectional view showing the second embodiment of the valve of the present invention, Figure 3 is a central longitudinal cross-sectional view of the third embodiment of the valve of the present invention, and Figure 4 is a horizontal cross-sectional view of the unload circuit section of Figure 3. FIG. 5 is a central longitudinal sectional view of a conventional series selector valve, and FIG. 5a is a symbolic diagram of its hydraulic circuit. 1, 1'... Spool insertion hole, 2, 2'... Housing, 3, 4... Hydraulic cylinder, 5, 5'...
...Spool, 8, 9...Communication path, 11,12...
Plug, 13...Unload valve, 14...Valve spring, 15...Cyoke hole, 6a...Communication path, 6b...
...Detour, A, A', B, B', C, C', D,
D'...Cylinder port _, P, P'...Pump port, _T1 , T'1, _T2 , _T'2 ...Tank port, _T3 , _T'3 ...Bypass circuit, _U1 , U
' ₁ ...First unloading port, _U2 ...Second unloading port, U...Unloading chamber.

Claims

[Claims for Utility Model Registration] (1) A pump port P in the center of the spool insertion hole 1, two sets of cylinder ports D, A, C, B on both sides of the pump port P, and tank ports at both ends. A housing 2 of a series selector valve in which T ₁ and T ₂ are arranged at equal intervals, plugs 11 and 12 for closing the cylinder ports D and C of one set of the housing 2, and inside the housing 2. a first unload port _U1 formed on the outside of the tank port _T1 ; an unload chamber U formed so as to communicate between the pump port P in the housing ₂ and the first unload port U1; A second unloading port _U2 communicates with the unloading chamber U, and a valve spring 14 operates the pump when the pump is not operating and when the pump is operating and moves the spool to the right or left. When the second unload port _U2 is closed to the port P, and the pump is activated and the spool is neutral, the pump port P and the second unload port _U2 are communicated with each other, and the second unload port U2 is connected to the first unload port _U1 . In this case, a check valve type unload valve 13 installed in the unloading chamber U so as to communicate only through the yoke hole 15 at all times, and a check valve type unload valve 13 installed in the spool insertion hole 1 of the housing 2 in three positions: neutral, left, and right. is slidably inserted and switched to
One set of cylinder ports A on the non-occluded side at the neutral position
, B and pump port P and tank port T ₁ , T
₂ and at the same time, the first unload port U
₁ and one tank port _T2 , and the cylinder ports A and B are alternately connected to the pump port P and the tank port _T1 or _T2 at the left and right positions, and at the same time, the first unload port U1 is connected to the first unload port _U1 . and a spool 5 having a plurality of control parts for cutting off communication with tank ports _T1 and _T2 . (2) Pump port P in the center of spool insertion hole 1, two sets of cylinder ports D, A, C, B on both sides of pump port P, tank ports T ₁ and T ₂ at both ends, etc. 2 those placed at intervals
A housing 2' of a dual selector valve, in which the cylinder ports D and C of one set are connected to the tank port _T2 and pump port P of the other side through communication passages 8 and 9; Plugs 11 and 12 that close the other set of cylinder ports D and C, and a first unload port formed on the outside of one tank port T ₁ and T' ₁ of both spool insertion holes 1 and 1'. _U1 , _U'1 , an unloading chamber U formed so as to communicate between the pump port P in the housing ₂ ' and one first unloading port U1, and the other first unloading port U. ' ₁ to the unloading chamber U via the first unloading port _U1 , a second unloading port _U2 communicating with the unloading chamber U, and a pump. is not operating, and when the pump is operating and the spool is moved to either the right or left, the second unload port _U2 is closed to the pump port P by the valve spring 14, and the pump is operated; When the spool is neutral, the pump port P and the second unload port _U2 are communicated, and the first unload port _U1 , _U'1 is always connected to the yoke hole 1.
A check valve type unload valve 13 installed in the unloading chamber U so as to communicate only at the spool insertion holes 1 and 1' of the housing 2'.
The cylinder ports A, B, A', B' and pump ports P, P, and Cylinder ports A, B, A', B' for one set on the non-occluded side are inserted in the neutral position so as to be slidable in three positions: neutral, left, and right.
P' and tank ports T ₁ , T ₂ , T' ₁ , T'
₂ and at the same time, the first unload port U
₁ , U' ₁ and one tank port T ₂ , T' ₂ and communicate with the above cylinder port A at the left and right positions.
, B, A', B' are alternately communicated with pump ports P, P' and tank ports T ₁ , T' ₁ or T ₂ , T' ₂ , and at the same time, the first unload port U ₁ , U' ₁ and tank ports T ₁ , T' ₁ , T ₂ , T
A selector valve with a bypass circuit characterized in that the selector valve comprises a spool 5, 5' having a plurality of control parts for cutting off communication with the spool 5 _, 5'.