JPH0226656U - - Google Patents
Info
- Publication number
- JPH0226656U JPH0226656U JP10414388U JP10414388U JPH0226656U JP H0226656 U JPH0226656 U JP H0226656U JP 10414388 U JP10414388 U JP 10414388U JP 10414388 U JP10414388 U JP 10414388U JP H0226656 U JPH0226656 U JP H0226656U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- speed
- boom
- arm
- hydraulic
- 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.)
- Granted
Links
- 238000003491 array Methods 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
Description
第１図は本考案の油圧回路図、第２図は従来例
の油圧回路図である。
Ａ，Ｂ：油圧ポンプ、１：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：バケツト開閉用コントロールバルブ、４：走
行用コントロールバルブ、５：旋回用コントロー
ルバルブ、６：アーム一速用コントロールバルブ
、７：ブーム二速、アーム二速兼用コントロール
バルブ、８：タンク、イ〜ヲ：パイロツト信号圧
。
FIG. 1 is a hydraulic circuit diagram of the present invention, and FIG. 2 is a hydraulic circuit diagram of a conventional example. A, B: Hydraulic pump, 1: Travel control valve, 2: Boom 1st speed control valve,
3: Bucket opening/closing control valve, 4: Traveling control valve, 5: Swivel control valve, 6: Arm 1st speed control valve, 7: Boom 2nd speed, arm 2nd speed combined control valve, 8: Tank, I~ wo: Pilot signal pressure.
Claims (1)
ンプＡには走行用バルブ１、ブーム一速用バルブ
２およびバケツト用バルブ３をパラレルに接続し
、他方の油圧ポンプＢには走行用バルブ４、旋回
用バルブ５、アーム一速用バルブ６をパラレルに
接続した油圧シヨベルの油圧回路において、前記
バルブ列１，２，３及び４，５，６の下流にブー
ム二速、アーム二速兼用バルブ７を接続し、該ブ
ーム二速、アーム二速兼用バルブ７は、前記ブー
ム一速用バルブ２にブーム上方向のパイロツト圧
ハを作用させたときはブーム二速用バルブとして
作動し、前記アーム一速用バルブ６にパイロツト
圧（ル又はヲ）を作用させたときはアーム二速用
バルブとして作動し、前記パイロツト圧ハ及び（
ル又はヲ）が同時に作用したときは中立位置を保
持することを特徴とする油圧シヨベルの操作油圧
回路。 Equipped with two hydraulic pumps A and B, one hydraulic pump A is connected in parallel with a traveling valve 1, a boom first speed valve 2, and a bucket valve 3, and the other hydraulic pump B is connected with a traveling valve. 4. In a hydraulic circuit of a hydraulic excavator in which a swing valve 5 and an arm first speed valve 6 are connected in parallel, a boom second speed and arm second speed valve is provided downstream of the valve arrays 1, 2, 3 and 4, 5, 6. A valve 7 is connected, and the boom 2nd speed and arm 2nd speed valve 7 operates as a boom 2nd speed valve when pilot pressure in the upward direction of the boom is applied to the boom 1st speed valve 2. When the pilot pressure (R or W) is applied to the arm 1st speed valve 6, it operates as the arm 2nd speed valve, and the pilot pressure C and (
1. An operating hydraulic circuit for a hydraulic excavator, characterized in that a neutral position is maintained when two (1) and (2) act simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10414388U JPH0633009Y2 (en) | 1988-08-08 | 1988-08-08 | Hydraulic circuit of hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10414388U JPH0633009Y2 (en) | 1988-08-08 | 1988-08-08 | Hydraulic circuit of hydraulic excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0226656U true JPH0226656U (en) | 1990-02-21 |
| JPH0633009Y2 JPH0633009Y2 (en) | 1994-08-31 |
Family
ID=31335598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10414388U Expired - Lifetime JPH0633009Y2 (en) | 1988-08-08 | 1988-08-08 | Hydraulic circuit of hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633009Y2 (en) |
-
1988
- 1988-08-08 JP JP10414388U patent/JPH0633009Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0633009Y2 (en) | 1994-08-31 |
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