JPH0254861U - - Google Patents
Info
- Publication number
- JPH0254861U JPH0254861U JP13088788U JP13088788U JPH0254861U JP H0254861 U JPH0254861 U JP H0254861U JP 13088788 U JP13088788 U JP 13088788U JP 13088788 U JP13088788 U JP 13088788U JP H0254861 U JPH0254861 U JP H0254861U
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- actuator
- pump
- travel
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011144 upstream manufacturing Methods 0.000 claims 2
Description
第１図は本考案の第一実施例油圧回路。第２図
はロジツク弁の別の例を示す。第３図は本考案の
第二実施例油圧回路を示す。第４図は公知油圧シ
ヨベルの油圧回路を示す。
図において；Ａ，Ｂ，Ｃ，Ｄ，Ｅ……油圧ポン
プ、１……左走行用コントロールバルブ、２……
ブーム一速用コントロールバルブ、３……バケツ
ト用コントロールバルブ、４……右走行用コント
ロールバルブ、５……ブーム二速用コントロール
バルブ、６……旋回用コントロールバルブ、７…
…アーム用コントロールバルブ、８，９……ロジ
ツク弁、１０，１１……信号用切換弁、１２……
吐出通路、１３……通路、１４……吐出通路、１
５……通路、１６……通路、１７……パラレル通
路、１８，１９……信号用通路、２０，２１……
信号用通路、２２，２３，２４……通路、２５…
…絞り。
FIG. 1 shows a hydraulic circuit according to a first embodiment of the present invention. FIG. 2 shows another example of a logic valve. FIG. 3 shows a second embodiment of the hydraulic circuit of the present invention. FIG. 4 shows a hydraulic circuit of a known hydraulic excavator. In the figure: A, B, C, D, E...Hydraulic pump, 1...Control valve for left travel, 2...
Control valve for boom 1st speed, 3... Control valve for bucket, 4... Control valve for right travel, 5... Control valve for boom 2nd speed, 6... Control valve for swing, 7...
...Arm control valve, 8,9...Logic valve, 10,11...Signal switching valve, 12...
Discharge passage, 13... Passage, 14... Discharge passage, 1
5... Passage, 16... Passage, 17... Parallel passage, 18, 19... Signal passage, 20, 21...
Signal passage, 22, 23, 24... passage, 25...
...Aperture.
Claims (1)
該走行モータ以外のアクチユエータへ供給する油
圧シヨベルの油圧回路において、一方のポンプグ
ループの最上流に走行モータを作動させる走行用
コントロールバルブを配設すると共に、該走行用
コントロールバルブを走行モータ以外のアクチユ
エータを作動させるコントロールバルブに対して
タンデムに接続し、他方のポンプグループの最上
流乃至走行モータ以外のアクチユエータを作動さ
せるコントロールバルブ間に他の走行用コントロ
ールバルブを配設すると共に、該他の走行用コン
トロールバルブ及び走行モータ以外のアクチユエ
ータを作動させるコントロールバルブをパラレル
に接続し、前記一方のポンプグループの走行用コ
ントロールバルブへ圧油を供給するポンプの吐出
通路を開閉動作するロジツク弁８を介して、他方
のポンプのパラレル通路と走行用コントロールバ
ルブの圧油通路との間に配設された開閉動作する
ロジツク弁９の下流へ接続し、走行モータ以外の
アクチユエータを動作させた時、ロジツク弁８を
開に、ロジツク弁９を閉にする様構成し、一方の
油圧ポンプの吐出油を左右走行用モータにパラレ
ルに、また他方の油圧ポンプの吐出油を走行モー
タ以外のアクチユエータに供給する様にしたこと
を特徴とする油圧シヨベルの油圧回路。 In the hydraulic circuit of the hydraulic excavator that supplies pressure oil from the left and right pumps to the left and right travel motors and actuators other than the travel motors, a travel control valve that operates the travel motors is provided at the most upstream side of one pump group. At the same time, the traveling control valve is connected in tandem to a control valve that operates an actuator other than the traveling motor, and the other traveling control valve is connected between the most upstream of the other pump group or the control valve that operates an actuator other than the traveling motor. A control valve is provided, and another control valve for driving and a control valve that operates an actuator other than the driving motor are connected in parallel, and a pump that supplies pressure oil to the driving control valve of the one pump group is connected in parallel. The discharge passage is connected via a logic valve 8 that opens and closes to the downstream side of a logic valve 9 that opens and closes and is disposed between the parallel passage of the other pump and the pressure oil passage of the travel control valve. When an actuator other than the above is operated, the logic valve 8 is opened and the logic valve 9 is closed, so that the oil discharged from one hydraulic pump is transferred in parallel to the left and right travel motors, and the oil discharged from the other hydraulic pump is A hydraulic circuit for a hydraulic excavator, characterized in that oil is supplied to an actuator other than a travel motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13088788U JPH0254861U (en) | 1988-10-07 | 1988-10-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13088788U JPH0254861U (en) | 1988-10-07 | 1988-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0254861U true JPH0254861U (en) | 1990-04-20 |
Family
ID=31386452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13088788U Pending JPH0254861U (en) | 1988-10-07 | 1988-10-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0254861U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993021395A1 (en) * | 1992-04-20 | 1993-10-28 | Hitachi Construction Machinery Co., Ltd. | Hydraulic circuit device for construction machines |
| JP2018071572A (en) * | 2016-10-25 | 2018-05-10 | 株式会社竹内製作所 | Hydraulic travel device |
-
1988
- 1988-10-07 JP JP13088788U patent/JPH0254861U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993021395A1 (en) * | 1992-04-20 | 1993-10-28 | Hitachi Construction Machinery Co., Ltd. | Hydraulic circuit device for construction machines |
| JP2018071572A (en) * | 2016-10-25 | 2018-05-10 | 株式会社竹内製作所 | Hydraulic travel device |
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