JPH01119457U - - Google Patents
Info
- Publication number
- JPH01119457U JPH01119457U JP1104288U JP1104288U JPH01119457U JP H01119457 U JPH01119457 U JP H01119457U JP 1104288 U JP1104288 U JP 1104288U JP 1104288 U JP1104288 U JP 1104288U JP H01119457 U JPH01119457 U JP H01119457U
- Authority
- JP
- Japan
- Prior art keywords
- pump
- valves
- right travel
- hydraulic
- pressure oil
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案にかかる油圧回路図、第２図
は小形シヨベルの側面図、第３図は従来技術油圧
回路図である。
２，３……走行モータ、５……旋回モータ、１
１……ドーザシリンダ、１２……第１ポンプ、１
３……第２ポンプ、１４，１５……走行弁、１６
……旋回弁、１７……ドーザ弁、１８，１９，２
０……切換弁、３１……走行直進弁、３２……電
磁弁、３３……第３ポンプ、３９……コントロー
ラ。
FIG. 1 is a hydraulic circuit diagram according to this invention, FIG. 2 is a side view of a small shovel, and FIG. 3 is a conventional hydraulic circuit diagram. 2, 3...Traveling motor, 5...Swivel motor, 1
1... Dozer cylinder, 12... First pump, 1
3... Second pump, 14, 15... Travel valve, 16
... Swivel valve, 17 ... Dozer valve, 18, 19, 2
0...Switching valve, 31...Direct travel valve, 32...Solenoid valve, 33...Third pump, 39...Controller.
Claims (1)
アクチユエータを２個のグループＡ，Ｂに分け、
各々第１、第２ポンプ吐出圧油により作動するよ
うにし、左右走行弁をグループＡ，Ｂのそれぞれ
最前列に設け、これと他の油圧アクチユエータ用
切換弁をタンデムに連結した油圧回路において、
上記左右走行弁および他の切換弁と、第１、第２
ポンプとの連通油路に走行直進弁を介設し、かつ
その走行直進弁を左右走行弁同時操作時に上記走
行直進弁を切換えて第１ポンプからの吐出圧油を
左右走行モータにパラレルに供給可能に設定し、
一方、第１、第２ポンプ以外の油圧源として第３
ポンプを設け、また左右走行モータ以外の油圧ア
クチユエータのうち旋回モータとドーザシリンダ
とをグループＣとして分離するとともに、そのグ
ループＣに対して上記第３ポンプからの吐出圧油
を供給可能に構成したことを特徴とする小形シヨ
ベルの油圧回路。 The various hydraulic actuators of a small excavator equipped with a dozer device are divided into two groups A and B.
In a hydraulic circuit in which the left and right travel valves are provided in the front rows of groups A and B, respectively, and these and other hydraulic actuator switching valves are connected in tandem, the left and right travel valves are operated by pressure oil discharged from the first and second pumps, respectively,
The left and right travel valves and other switching valves, the first and second
A straight travel valve is interposed in the oil passage communicating with the pump, and when the left and right travel valves are operated simultaneously, the straight travel valve is switched to supply pressure oil discharged from the first pump to the left and right travel motors in parallel. set to possible,
On the other hand, a third pump is used as a hydraulic power source other than the first and second pumps.
A pump is provided, and among the hydraulic actuators other than the left and right travel motors, the swing motor and dozer cylinder are separated as a group C, and the pressure oil discharged from the third pump can be supplied to the group C. A hydraulic circuit for a small excavator featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988011042U JPH0643258Y2 (en) | 1988-01-28 | 1988-01-28 | Small excavator hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988011042U JPH0643258Y2 (en) | 1988-01-28 | 1988-01-28 | Small excavator hydraulic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01119457U true JPH01119457U (en) | 1989-08-14 |
| JPH0643258Y2 JPH0643258Y2 (en) | 1994-11-09 |
Family
ID=31219245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988011042U Expired - Lifetime JPH0643258Y2 (en) | 1988-01-28 | 1988-01-28 | Small excavator hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643258Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS637425A (en) * | 1986-06-26 | 1988-01-13 | Yutani Heavy Ind Ltd | Oil-pressure circuit for construction machine |
-
1988
- 1988-01-28 JP JP1988011042U patent/JPH0643258Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS637425A (en) * | 1986-06-26 | 1988-01-13 | Yutani Heavy Ind Ltd | Oil-pressure circuit for construction machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0643258Y2 (en) | 1994-11-09 |