JPH025447U - - Google Patents
Info
- Publication number
- JPH025447U JPH025447U JP8216388U JP8216388U JPH025447U JP H025447 U JPH025447 U JP H025447U JP 8216388 U JP8216388 U JP 8216388U JP 8216388 U JP8216388 U JP 8216388U JP H025447 U JPH025447 U JP H025447U
- Authority
- JP
- Japan
- Prior art keywords
- switching valve
- stroke
- civil engineering
- construction machinery
- hydraulic
- 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 4
- 239000002131 composite material Substances 0.000 claims 2
- 230000007935 neutral effect Effects 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の油圧シヨベルの水平ならし作
業の模型図とブーム、アームなど各アクチユエー
タを制御する油圧回路図を示し、第２図はブーム
制御の従来の特性線図に本考案の特性を付加して
表わし、第３図は本考案の別の実施例の油圧回路
図を示す。
１１……アーム、１２……アーム用油圧シリン
ダ、１３……ブーム、１４……ブーム用油圧シリ
ンダ、１５，１８……ポンプ、１６……ブーム用
切換弁、１７……アーム合流用切換弁、１９……
アーム用切換弁、２０……バケツト、２１，２２
……パイロツトバルブ、２３，２３ａ……補助切
換弁。
Figure 1 shows a model diagram of leveling work for the hydraulic excavator of the present invention and a hydraulic circuit diagram for controlling each actuator such as the boom and arm. Figure 2 shows the conventional characteristic diagram for boom control and the characteristics of the present invention. FIG. 3 shows a hydraulic circuit diagram of another embodiment of the present invention. 11... Arm, 12... Hydraulic cylinder for arm, 13... Boom, 14... Hydraulic cylinder for boom, 15, 18... Pump, 16... Switching valve for boom, 17... Switching valve for arm merging, 19...
Switching valve for arm, 20... Bucket, 21, 22
...Pilot valve, 23, 23a...Auxiliary switching valve.
Claims (1)
つて駆動されるアクチユエータと、前記油圧ポン
プから前記アクチユエータへ供給される圧油の方
向および流量を制御する複合制御弁とから成り、
前記複合制御弁がタンデム回路で回路構成され、
前記複合制御弁がパイロツト圧力により操作され
る土木・建設機械用油圧回路において、上流側切
換弁の供給通路より下流側切換弁の供給通路に、
上流側切換弁と連動して操作される補助切換弁を
介して油通路を設けたことを特徴とする土木・建
設機械用油圧回路。 (2) 前記補助切換弁を中立時に閉、ストローク
途中は開、ストロークエンドで閉となるようにし
たことを特徴とする実用新案登録請求の範囲第１
項記載の土木・建設機械用油圧回路。 (3) 前記補助切換弁を中立時に絞り、ストロー
ク途中は開、ストロークエンドで絞りとなるよう
にしたことを特徴とする実用新案登録請求の範囲
第１項記載の土木・建設機械用油圧回路。[Claims for Utility Model Registration] (1) A hydraulic pump, an actuator driven by pressure oil from the hydraulic pump, and a combination that controls the direction and flow rate of the pressure oil supplied from the hydraulic pump to the actuator. Consists of a control valve,
The composite control valve is configured with a tandem circuit,
In a hydraulic circuit for civil engineering and construction machinery in which the composite control valve is operated by pilot pressure, the supply passage of the downstream switching valve is connected to the supply passage of the upstream switching valve,
A hydraulic circuit for civil engineering and construction machinery, characterized in that an oil passage is provided through an auxiliary switching valve operated in conjunction with an upstream switching valve. (2) Utility model registration claim 1, characterized in that the auxiliary switching valve is closed when in neutral, opened during the middle of the stroke, and closed at the end of the stroke.
Hydraulic circuits for civil engineering and construction machinery as described in section. (3) The hydraulic circuit for civil engineering and construction machinery according to claim 1, wherein the auxiliary switching valve is throttled in neutral, opened during the middle of the stroke, and throttled at the end of the stroke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988082163U JPH0730776Y2 (en) | 1988-06-21 | 1988-06-21 | Hydraulic circuits for civil engineering and construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988082163U JPH0730776Y2 (en) | 1988-06-21 | 1988-06-21 | Hydraulic circuits for civil engineering and construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH025447U true JPH025447U (en) | 1990-01-16 |
| JPH0730776Y2 JPH0730776Y2 (en) | 1995-07-19 |
Family
ID=31306927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988082163U Expired - Lifetime JPH0730776Y2 (en) | 1988-06-21 | 1988-06-21 | Hydraulic circuits for civil engineering and construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730776Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5070702U (en) * | 1973-10-29 | 1975-06-23 | ||
| JPS53141703U (en) * | 1977-04-12 | 1978-11-09 |
-
1988
- 1988-06-21 JP JP1988082163U patent/JPH0730776Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5070702U (en) * | 1973-10-29 | 1975-06-23 | ||
| JPS53141703U (en) * | 1977-04-12 | 1978-11-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0730776Y2 (en) | 1995-07-19 |
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