JPS646421A - Oil-pressure circuit for working machine of construction machinery - Google Patents
Oil-pressure circuit for working machine of construction machineryInfo
- Publication number
- JPS646421A JPS646421A JP16094187A JP16094187A JPS646421A JP S646421 A JPS646421 A JP S646421A JP 16094187 A JP16094187 A JP 16094187A JP 16094187 A JP16094187 A JP 16094187A JP S646421 A JPS646421 A JP S646421A
- Authority
- JP
- Japan
- Prior art keywords
- cylinders
- cylinder
- lift
- blade
- bilateral
- 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
Abstract
PURPOSE:To control flow rates supplied to each cylinder with high accuracy by providing a valve by which each cylinder of bilateral lift angles and tilt pitches, at least one of which is made up of both rod cylinders, is switched to parallel or serial connection. CONSTITUTION:Bilateral lift angle cylinders 91 and 92 among the cylinders 91 and 92 and bilateral tilt pitch cylinders 191 and 192 which are provided for a bulldozer are made up of both rod cylinders. When a blade 12 is lifted for example, oil pressure goes through a lift position 292 into the left side lift angle cylinder 91 at first to short-circuit a piston lever 9d and at the same time goes through a lift position 292 from a pressure chamber 9g into the right side cylinder 92 to contract the piston lever 9d by the same amount as in the left side. The blade 12 is thereby raised. The 8-direction action of the blade can thus be performed smoothly and exactly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16094187A JPH086344B2 (en) | 1987-06-30 | 1987-06-30 | Working machine hydraulic circuit of construction machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16094187A JPH086344B2 (en) | 1987-06-30 | 1987-06-30 | Working machine hydraulic circuit of construction machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS646421A true JPS646421A (en) | 1989-01-11 |
JPH086344B2 JPH086344B2 (en) | 1996-01-24 |
Family
ID=15725534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16094187A Expired - Lifetime JPH086344B2 (en) | 1987-06-30 | 1987-06-30 | Working machine hydraulic circuit of construction machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH086344B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0383257U (en) * | 1989-12-07 | 1991-08-23 | ||
JP2014185443A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
JP2014185439A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
JP2014185442A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
-
1987
- 1987-06-30 JP JP16094187A patent/JPH086344B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0383257U (en) * | 1989-12-07 | 1991-08-23 | ||
JP2014185443A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
JP2014185439A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
JP2014185442A (en) * | 2013-03-22 | 2014-10-02 | Nippon Sharyo Seizo Kaisha Ltd | Tubing device |
Also Published As
Publication number | Publication date |
---|---|
JPH086344B2 (en) | 1996-01-24 |
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