JPH0230503U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図乃至第３図は本考案に係る選択バルブの
実施例を示す断面説明図で、第１図は中立位置を
示し、第２図は左位置を示し、第３図は右位置を
示す。第４図は油圧シリンダと油圧方向切換バル
ブとの間に本考案に係る選択バルブを配置した油
圧回路図である。第５図は作業機の概略側面図、
第６は油圧シリンダと油圧方向切換バルブとの間
に従来の選択バルブを配設した油圧回路図、第７
図および第８図は従来の選択バルブの断面説明図
である。 ８……油圧方向切換バルブ、１１……内周面、
１２〜１８……第１乃至第７の環状凹溝、１９…
…スプール挿通孔、４０……選択バルブ、４１…
…スプール、４２〜４６……ランド、４２ａ，４
３ａ……外周面、４７……バイパス通路、ａ，ｂ
，ｃ，ｄ，ｅ，ｆ……ポート。 1 to 3 are cross-sectional explanatory views showing an embodiment of the selection valve according to the present invention, in which FIG. 1 shows the neutral position, FIG. 2 shows the left position, and FIG. 3 shows the right position. . FIG. 4 is a hydraulic circuit diagram in which a selection valve according to the present invention is disposed between a hydraulic cylinder and a hydraulic directional valve. Figure 5 is a schematic side view of the work machine;
No. 6 is a hydraulic circuit diagram in which a conventional selection valve is arranged between a hydraulic cylinder and a hydraulic directional valve; No. 7
8 and 8 are cross-sectional explanatory views of a conventional selection valve. 8...Hydraulic directional valve, 11...Inner peripheral surface,
12-18...first to seventh annular grooves, 19...
...Spool insertion hole, 40...Selection valve, 41...
...Spool, 42-46...Land, 42a, 4
3a...Outer peripheral surface, 47...Bypass passage, a, b
, c, d, e, f... port.

補正 昭６３．１０．２６ 図面の簡単な説明を次のように補正する。 明細書中、第１５頁第２０行「第６は」を「第
６図は」と補正する。Amendment October 26, 1983 The brief description of the drawing is amended as follows. In the specification, on page 15, line 20, "6th wa" is amended to "Fig. 6 wa".

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 第１および第２の油圧シリンダと油圧方向切換
弁との間の油圧回路中に配設された選択バルブに
おいて、上記選択バルブは、内周面に第１乃至第
７の環状凹溝を並設形成したスプール挿通孔を有
すると共に、シリンダ側に第２、第３、第５及び
第６の環状凹溝に開口するポートを形成し、かつ
、ポンプ側に第４の環状凹溝に開口するポートお
よび第１と第７の環状凹溝に分岐開口するポート
を形成したスリーブと、上記スリーブのスプール
挿通孔に作動位置を３位置に変更可能に挿通し、
かつ、複数のランドを形成すると共に、第１と第
２のランド間に該ランドの外周面に開口するバイ
パス通路を形成したスプールとを具備し、中立位
置では、バイパス通路を閉鎖して第３と第４の環
状凹溝および第６と第７の環状凹溝が夫々連通し
、左右のいずれか一方の位置では、第３の環状凹
溝が第４の環状凹溝およびバイパス通路を介して
第１の環状凹溝に連通し、かつ、第６と第７の環
状溝が連通し、他方の位置では、第１と第２の環
状凹溝および第４と第５の環状凹溝が夫々連通す
るように構成したことを特徴とする選択バルブ。 In the selection valve disposed in the hydraulic circuit between the first and second hydraulic cylinders and the hydraulic directional control valve, the selection valve has first to seventh annular grooves arranged in parallel on its inner peripheral surface. a spool insertion hole formed therein, a port opening to the second, third, fifth, and sixth annular grooves on the cylinder side, and a port opening to the fourth annular groove on the pump side; and a sleeve formed with ports that branch into the first and seventh annular grooves, and inserted into the spool insertion hole of the sleeve so that the operating position can be changed to three positions,
and a spool that forms a plurality of lands and a bypass passage that opens on the outer peripheral surface of the land between the first and second lands, and in the neutral position, the bypass passage is closed and the third land is opened. and the fourth annular groove and the sixth and seventh annular grooves are in communication with each other, and at either the left or right position, the third annular groove is connected to the fourth annular groove and the bypass passage. The first annular groove communicates with the sixth and seventh annular grooves, and at the other position, the first and second annular grooves and the fourth and fifth annular grooves communicate with each other, respectively. A selection valve characterized by being configured to communicate with each other.