JPS63185854U - - Google Patents
Info
- Publication number
- JPS63185854U JPS63185854U JP7745787U JP7745787U JPS63185854U JP S63185854 U JPS63185854 U JP S63185854U JP 7745787 U JP7745787 U JP 7745787U JP 7745787 U JP7745787 U JP 7745787U JP S63185854 U JPS63185854 U JP S63185854U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- operation valve
- center bypass
- passage
- traveling
- 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)
- Fluid-Pressure Circuits (AREA)
Description
図面は本考案に係る旋回式バツクホウ作業車の
油圧回路の実施例を示し、第１図は全体油圧回路
図、第２図は旋回式バツクホウ作業車の側面図、
第３図は従来の全体油圧回路図である。
１……走行装置、１１……第１センタバイパス
路、１２……合流用流路、１３……リターン路、
１４……パイロツト圧式切換弁、１５……第２セ
ンタバイパス路、Ｖ１……第１走行用操作弁、Ｖ
４……第２走行用操作弁、Ｖ６……アーム用操作
弁、Ｐ１……第１ポンプ、Ｐ２……第２ポンプ、
Ｔ……タンク。
The drawings show an embodiment of the hydraulic circuit of the swing-type backhoe work vehicle according to the present invention, and FIG. 1 is an overall hydraulic circuit diagram, and FIG. 2 is a side view of the swing-type backhoe work vehicle.
FIG. 3 is a conventional overall hydraulic circuit diagram. DESCRIPTION OF SYMBOLS 1... Travel device, 11... First center bypass path, 12... Merging channel, 13... Return path,
14...Pilot pressure type switching valve, 15...Second center bypass path, V1 ...First travel operation valve, V
4 ...Second traveling operation valve, V6 ...Arm operation valve, P1 ...First pump, P2 ...Second pump,
T...Tank.
Claims (1)
操作弁Ｖ１と、バケツト用・ブーム用・旋回台用
のうち少なくとも１個に対するバツクホウ用操作
弁とを第１ポンプＰ１に並列接続し、左右走行体
装置１，１の他方に対する第２走行用操作弁Ｖ４
とアーム用操作弁Ｖ６とを第２ポンプＰ２に並列
接続し、前記第１走行用操作弁Ｖ１とバツクホウ
用操作弁とを含む多連弁の第１センタバイパス路
１１を、前記第２走行用操作弁Ｖ４とアーム用操
作弁Ｖ６とを含む多連弁の第２センタバイパス路
１５に、前記アーム用操作弁Ｖ６の上手側で前記
第２走行用操作弁Ｖ４の下手側において合流用流
路１２で接続してある旋回式バツクホウ作業車の
油圧回路であつて、前記第１センタバイパス路１
１をタンクＴに接続するリターン路１３を設ける
とともに、前記第１センタバイパス路１１を前記
合流用流路１２と前記リターン路１３に択一接続
するパイロツト圧式切換弁１４を、前記アーム用
操作弁Ｖ６の開操作に伴う前記合流用流路１２で
の設定圧以上の油圧上昇時のみ前記第１センタバ
イパス路１１に前記合流用流路１２が接続される
ように形成して設けてある旋回式バツクホウ作業
車の油圧回路。 A first traveling operating valve V1 for one of the left and right traveling devices 1, 1 and a backhoe operating valve for at least one of the bucket, boom, and swivel base are connected in parallel to the first pump P1 , Second traveling operation valve V 4 for the other of the left and right traveling body devices 1, 1
and arm operation valve V6 are connected in parallel to the second pump P2 , and the first center bypass path 11 of the multiple valve including the first traveling operation valve V1 and the backhoe operation valve is connected to the second pump P2. In the second center bypass path 15 of the multiple valve including the two travel operation valves V4 and the arm operation valve V6 , the second travel operation valve V4 is connected to the upper side of the arm operation valve V6 . A hydraulic circuit for a swing-type backhoe work vehicle connected by a merging flow path 12 on the downstream side, the first center bypass path 1
1 to the tank T, and a pilot pressure switching valve 14 for selectively connecting the first center bypass passage 11 to the merging passage 12 and the return passage 13, as well as the arm operation valve. A swirl formed so that the merging passage 12 is connected to the first center bypass passage 11 only when the oil pressure in the merging passage 12 rises above the set pressure due to the opening operation of the V 6 . Hydraulic circuit of a backhoe work vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7745787U JPS63185854U (en) | 1987-05-23 | 1987-05-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7745787U JPS63185854U (en) | 1987-05-23 | 1987-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63185854U true JPS63185854U (en) | 1988-11-29 |
Family
ID=30925481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7745787U Pending JPS63185854U (en) | 1987-05-23 | 1987-05-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63185854U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04146336A (en) * | 1990-10-09 | 1992-05-20 | Toshiba Mach Co Ltd | Hydraulic circuit for hydraulic shovel |
-
1987
- 1987-05-23 JP JP7745787U patent/JPS63185854U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04146336A (en) * | 1990-10-09 | 1992-05-20 | Toshiba Mach Co Ltd | Hydraulic circuit for hydraulic shovel |
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