JPH0223051U - - Google Patents
Info
- Publication number
- JPH0223051U JPH0223051U JP1988099539U JP9953988U JPH0223051U JP H0223051 U JPH0223051 U JP H0223051U JP 1988099539 U JP1988099539 U JP 1988099539U JP 9953988 U JP9953988 U JP 9953988U JP H0223051 U JPH0223051 U JP H0223051U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- hydraulic pump
- oil passage
- relief
- pressure relief
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
Description
図面は本考案に係るバツクホウの油圧回路の実
施例を示し、第１図は油圧回路図、第２図は油路
形成用ブロツクの展開断面図、第３図は油路形成
用ブロツクの斜視図、第４図はドーザ付きバツク
ホウ全体の側面図、第５図及び第６図は別実施油
圧回路図である。
９……第１給油路、１２……第２給油路、１６
……高圧リリーフ弁、１７……低圧リリーフ弁、
１８……切換え弁、１９……リリーフ油路、Ｂ…
…油路形成用ブロツク、Ｐ１……第１油圧ポンプ
、Ｐ２……第２油圧ポンプ、Ｐ３……第３油圧ポ
ンプ、Ｅ……エンジン、Ｖ１……アーム操作弁、
Ｖ３，Ｖ５……走行操作弁、Ｖ６……ブーム操作
弁、Ｖ７……バケツト操作弁、Ｖ８……旋回操作
弁。
The drawings show an embodiment of the hydraulic circuit for a backhoe according to the present invention, in which Fig. 1 is a hydraulic circuit diagram, Fig. 2 is a developed sectional view of an oil passage forming block, and Fig. 3 is a perspective view of the oil passage forming block. , FIG. 4 is a side view of the entire backhoe with dozer, and FIGS. 5 and 6 are hydraulic circuit diagrams of other implementations. 9...First oil supply path, 12...Second oil supply path, 16
...High pressure relief valve, 17...Low pressure relief valve,
18...Switching valve, 19...Relief oil path, B...
...Oil passage forming block, P1 ...First hydraulic pump, P2 ...Second hydraulic pump, P3 ...Third hydraulic pump, E...Engine, V1 ...Arm operating valve,
V 3 , V 5 ... travel operation valve, V 6 ... boom operation valve, V 7 ... bucket operation valve, V 8 ... swing operation valve.
Claims (1)
第３油圧ポンプＰ３を同一のエンジンＥによつて
駆動される状態で設け、左右用走行操作弁Ｖ３，
Ｖ５のうちの一方の走行操作弁Ｖ３、及び、アー
ム操作弁Ｖ１を第１給油路９を介して前記第１油
圧ポンプＰ１に接続し、前記左右用走行操作弁Ｖ
３，Ｖ５のうちの他方の走行操作弁Ｖ５、ブーム
操作弁Ｖ６及びバケツト操作弁Ｖ７を第２給油路
１２を介して前記第２油圧ポンプＰ２に接続し、
旋回操作弁Ｖ８を前記第３油圧ポンプＰ３に接続
したバツクホウの油圧回路であつて、前記第１給
油路９及び前記第２給油路１２に同一のリリーフ
油路１９を接続すると共に、高圧リリーフ弁１６
、低圧リリーフ弁１７、及び前記高圧リリーフ弁
１６が現出する高圧と前記低圧リリーフ弁１７が
現出する低圧とに前記リリーフ油路１９のリリー
フ圧を変更する切換え弁１８を前記リリーフ油路
１９に備えさせ、前記リリーフ油路１９を油路形
成用ブロツクＢにより形成してあると共に、前記
高圧リリーフ弁１６、前記低圧リリーフ弁１７及
び前記切換え弁１８を前記油路形成用ブロツクＢ
に組付けてあるバツクホウの油圧回路。 A first hydraulic pump P 1 , a second hydraulic pump P 2 and a third hydraulic pump P 3 are provided to be driven by the same engine E, and left and right travel operation valves V 3 ,
One travel operation valve V 3 of V 5 and the arm operation valve V 1 are connected to the first hydraulic pump P 1 via a first oil supply path 9, and the left and right travel operation valve V
3 and V5 , the other traveling operation valve V5 , boom operation valve V6 , and bucket operation valve V7 are connected to the second hydraulic pump P2 via a second oil supply path 12,
A backhoe hydraulic circuit in which a swing operation valve V8 is connected to the third hydraulic pump P3 , the same relief oil passage 19 is connected to the first oil supply passage 9 and the second oil supply passage 12, and the same relief oil passage 19 is connected to the high pressure Relief valve 16
, a low pressure relief valve 17, and a switching valve 18 for changing the relief pressure of the relief oil passage 19 between the high pressure produced by the high pressure relief valve 16 and the low pressure produced by the low pressure relief valve 17. The relief oil passage 19 is formed by the oil passage forming block B, and the high pressure relief valve 16, the low pressure relief valve 17 and the switching valve 18 are formed by the oil passage forming block B.
The hydraulic circuit of the backhoe installed in the.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988099539U JPH0223051U (en) | 1988-07-27 | 1988-07-27 | |
| US07/347,730 US4986075A (en) | 1988-07-26 | 1989-05-05 | Hydraulic circuit for backhoe |
| DE3916992A DE3916992A1 (en) | 1988-07-26 | 1989-05-24 | HYDRAULIC CIRCUIT FOR A LOEFFEL EXCAVATOR |
| FR898907093A FR2634806B1 (en) | 1988-07-26 | 1989-05-30 | |
| GB8913458A GB2222809B (en) | 1988-07-26 | 1989-06-12 | Hydraulic circuit for backhoe |
| KR1019890008078A KR930002370B1 (en) | 1988-07-26 | 1989-06-12 | Hydraulic circuit for backhoe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988099539U JPH0223051U (en) | 1988-07-27 | 1988-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0223051U true JPH0223051U (en) | 1990-02-15 |
Family
ID=31326792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988099539U Pending JPH0223051U (en) | 1988-07-26 | 1988-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0223051U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63138026A (en) * | 1986-11-27 | 1988-06-10 | Yutani Heavy Ind Ltd | Oil-pressure circuit of oil-pressure shovel |
-
1988
- 1988-07-27 JP JP1988099539U patent/JPH0223051U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63138026A (en) * | 1986-11-27 | 1988-06-10 | Yutani Heavy Ind Ltd | Oil-pressure circuit of oil-pressure shovel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR920005500B1 (en) | Hydraulic circuit for backhoe | |
| JPH0223051U (en) | ||
| JPS6272356U (en) | ||
| JPS60126553U (en) | Hydraulic circuits for civil engineering and construction machinery | |
| JPS63185854U (en) | ||
| JPS60148366U (en) | Power shovel hydraulic circuit | |
| JPS5935662Y2 (en) | Backhoe fluid pressure supply device | |
| JPS60151957U (en) | Power shovel hydraulic circuit | |
| JPS59125563U (en) | Construction machinery hydraulic circuit | |
| JPH0415810Y2 (en) | ||
| JPS58164982U (en) | Crawler type traveling device | |
| JPH086122Y2 (en) | Hydraulic circuit of small excavator | |
| JPH0352267Y2 (en) | ||
| JPS6231167U (en) | ||
| JPH0340354U (en) | ||
| JPH01150653U (en) | ||
| JPS61155461U (en) | ||
| JPH0254861U (en) | ||
| JPS61198582U (en) | ||
| JPS635058U (en) | ||
| JPS6162965U (en) | ||
| JPH0242821U (en) | ||
| JPS6154062U (en) | ||
| JPS6164503U (en) | ||
| JPS6150155U (en) |