JPH01156254U - - Google Patents
Info
- Publication number
- JPH01156254U JPH01156254U JP5139188U JP5139188U JPH01156254U JP H01156254 U JPH01156254 U JP H01156254U JP 5139188 U JP5139188 U JP 5139188U JP 5139188 U JP5139188 U JP 5139188U JP H01156254 U JPH01156254 U JP H01156254U
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- boom
- hydraulic oil
- oil passage
- head pressure
- 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
- 238000010276 construction Methods 0.000 claims 2
- 239000010720 hydraulic oil Substances 0.000 claims 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案にかかるシリンダ回路図、第
２図および第３図はこの考案の緩衝弁の構成を示
すシリンダ回路図、第４図は油圧シヨベルの斜視
図、第５図は従来技術シリンダ回路図、第６図は
従来技術シリンダ回路におけるブームシリンダの
シリンダヘツド圧、シリンダロツド圧の油圧波形
および上部旋回体の揺動角度変位を示すグラフで
ある。
４……ブーム、５……ブームシリンダ、６……
シリンダヘツド室、７……シリンダロツド室、１
９……緩衝弁、２０，２１……第１、第２プラン
ジヤ、２２……絞り部。
Fig. 1 is a cylinder circuit diagram according to this invention, Figs. 2 and 3 are cylinder circuit diagrams showing the structure of a buffer valve of this invention, Fig. 4 is a perspective view of a hydraulic shovel, and Fig. 5 is a cylinder circuit diagram of the prior art. The circuit diagram, FIG. 6, is a graph showing the hydraulic waveforms of the cylinder head pressure and cylinder rod pressure of the boom cylinder and the swing angle displacement of the upper revolving structure in the prior art cylinder circuit. 4...Boom, 5...Boom cylinder, 6...
Cylinder head chamber, 7... Cylinder rod chamber, 1
9... Buffer valve, 20, 21... First and second plungers, 22... Throttle portion.
Claims (1)
に作業アタツチメントを取付け、その作業アタツ
チメントのブームをブームシリンダにより上下方
向に回動可能とした建設機械において、ブームシ
リンダ駆動回路のそれぞれ作動油路を緩衝弁を介
して連結し、その緩衝弁内の第１および第２プラ
ンジヤにシリンダヘツド圧を作用可能とし、上記
シリンダヘツド圧が瞬時的に上昇したとき上記第
２プランジヤの作動を若干遅延可能とするととも
に、ブームシリンダ駆動回路のそれぞれ作動油路
を瞬時の間だけ連通可能に設定して構成したこと
を特徴とする建設機械のシリンダ回路。 In a construction machine in which a work attachment is attached to the front part of the above-mentioned revolving structure provided on the undercarriage, and the boom of the work attachment can be rotated in the vertical direction by a boom cylinder, each hydraulic oil passage of the boom cylinder drive circuit is The cylinder head pressure can be applied to the first and second plungers within the buffer valve, and the operation of the second plunger can be slightly delayed when the cylinder head pressure instantaneously increases. A cylinder circuit for construction machinery, characterized in that each hydraulic oil passage of the boom cylinder drive circuit is configured to be able to communicate only for an instant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5139188U JPH0643257Y2 (en) | 1988-04-15 | 1988-04-15 | Cylinder circuit of construction machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5139188U JPH0643257Y2 (en) | 1988-04-15 | 1988-04-15 | Cylinder circuit of construction machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156254U true JPH01156254U (en) | 1989-10-26 |
| JPH0643257Y2 JPH0643257Y2 (en) | 1994-11-09 |
Family
ID=31277417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5139188U Expired - Lifetime JPH0643257Y2 (en) | 1988-04-15 | 1988-04-15 | Cylinder circuit of construction machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643257Y2 (en) |
-
1988
- 1988-04-15 JP JP5139188U patent/JPH0643257Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0643257Y2 (en) | 1994-11-09 |
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