JPH0426263U - - Google Patents
Info
- Publication number
- JPH0426263U JPH0426263U JP6535190U JP6535190U JPH0426263U JP H0426263 U JPH0426263 U JP H0426263U JP 6535190 U JP6535190 U JP 6535190U JP 6535190 U JP6535190 U JP 6535190U JP H0426263 U JPH0426263 U JP H0426263U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- arm
- bucket
- pressure
- hydraulic circuit
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 230000000630 rising effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
図面は本考案に係るパワーシヨベルのリリーフ
圧制御装置の実施例を構成を概念的に示す図であ
る。
1……可変容量型油圧ポンプ、2……作業機油
圧回路、3……ブーム用油圧シリンダ、4……可
変型リリーフ弁、5……パイロツト用通路、6…
…電磁切換弁、7……コントロールポンプ、8…
…ヘビーリフトスイツチ、9,10,11……圧
力スイツチ、12,13……バツテリ、14……
リレー。
The drawing is a diagram conceptually showing the configuration of an embodiment of a relief pressure control device for a power shovel according to the present invention. DESCRIPTION OF SYMBOLS 1... Variable capacity hydraulic pump, 2... Work equipment hydraulic circuit, 3... Hydraulic cylinder for boom, 4... Variable relief valve, 5... Pilot passage, 6...
...Solenoid switching valve, 7...Control pump, 8...
...Heavy lift switch, 9,10,11...Pressure switch, 12,13...Battery, 14...
relay.
Claims (1)
てブーム、アームおよびバケツトを駆動するアク
チユエータに供給して、これらブーム、アームお
よびバケツトを作動させるパワーシヨベルにおい
て、 前記作業機油圧回路内の圧力を高、低2段階に
可変設定する可変型リリーフ弁と、 前記ブーム、アームおよびバケツトの作動状態
をそれぞれ検出する検出手段と、 前記検出手段によつてアームおよびバケツトが
定位置に固定されるとともにブームが上昇してい
ることが検出された場合に、前記作業機油圧回路
内の圧力が高圧になるように前記可変型リリーフ
弁を可変する手段と を具えたことを特徴とするパワーシヨベルのリリ
ーフ圧制御装置。[Claim for Utility Model Registration] In a power shovel that operates a boom, arm, and bucket by supplying pressure oil discharged from a hydraulic pump to an actuator that drives the boom, arm, and bucket via a work equipment hydraulic circuit, A variable relief valve that variably sets the pressure in the machine hydraulic circuit in two stages, high and low; a detection means that detects the operating states of the boom, arm, and bucket; and a detection means that determines the position of the arm and bucket. It is characterized by comprising means for varying the variable relief valve so that the pressure in the working machine hydraulic circuit becomes high pressure when it is detected that the boom is fixed in position and is rising. Relief pressure control device for power shovels.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990065351U JP2511165Y2 (en) | 1990-06-20 | 1990-06-20 | Relief pressure control device for power shovel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990065351U JP2511165Y2 (en) | 1990-06-20 | 1990-06-20 | Relief pressure control device for power shovel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0426263U true JPH0426263U (en) | 1992-03-02 |
JP2511165Y2 JP2511165Y2 (en) | 1996-09-18 |
Family
ID=31597103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1990065351U Expired - Fee Related JP2511165Y2 (en) | 1990-06-20 | 1990-06-20 | Relief pressure control device for power shovel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2511165Y2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053337A1 (en) * | 2002-12-10 | 2004-06-24 | Shin Caterpillar Mitsubishi Ltd. | Automatic booster for working machines |
JP2010223390A (en) * | 2009-03-25 | 2010-10-07 | Kobelco Contstruction Machinery Ltd | Hydraulic pump control device for construction machine |
US10358798B2 (en) | 2016-02-08 | 2019-07-23 | Komatsu Ltd. | Work vehicle and method of controlling operation |
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 |
-
1990
- 1990-06-20 JP JP1990065351U patent/JP2511165Y2/en not_active Expired - Fee Related
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 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053337A1 (en) * | 2002-12-10 | 2004-06-24 | Shin Caterpillar Mitsubishi Ltd. | Automatic booster for working machines |
JP2010223390A (en) * | 2009-03-25 | 2010-10-07 | Kobelco Contstruction Machinery Ltd | Hydraulic pump control device for construction machine |
US10358798B2 (en) | 2016-02-08 | 2019-07-23 | Komatsu Ltd. | Work vehicle and method of controlling operation |
DE112016000048B4 (en) | 2016-02-08 | 2023-10-19 | Komatsu Ltd. | Work vehicle and method for controlling work processes |
Also Published As
Publication number | Publication date |
---|---|
JP2511165Y2 (en) | 1996-09-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |