JPS594165Y2 - Construction machinery hydraulic circuit - Google Patents
Construction machinery hydraulic circuitInfo
- Publication number
- JPS594165Y2 JPS594165Y2 JP15413179U JP15413179U JPS594165Y2 JP S594165 Y2 JPS594165 Y2 JP S594165Y2 JP 15413179 U JP15413179 U JP 15413179U JP 15413179 U JP15413179 U JP 15413179U JP S594165 Y2 JPS594165 Y2 JP S594165Y2
- Authority
- JP
- Japan
- Prior art keywords
- side chamber
- cylinder
- bottom side
- piston
- hydraulic cylinder
- 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.)
- Expired
Links
Description
【考案の詳細な説明】
この考案は油圧シリンダと接続する閉回路に等価シリン
ダを設けて、受圧面積差による流量の差違を吸収するよ
うにした建設機械の油圧回路に関する。[Detailed Description of the Invention] This invention relates to a hydraulic circuit for construction machinery in which an equivalent cylinder is provided in a closed circuit connected to a hydraulic cylinder to absorb a difference in flow rate due to a difference in pressure receiving area.
一般に建設機械に用いられる油圧シリンダにおいては、
ロッド側とボトム側では受圧面積が異なる。In hydraulic cylinders generally used in construction machinery,
The pressure receiving area is different between the rod side and the bottom side.
このため油圧シリンダを閉回路に接続して、ロッド側ま
たはボトム側に等量の油圧を流した場合、ロッド側では
過剰となり、ボトム側では不足する。For this reason, when a hydraulic cylinder is connected to a closed circuit and an equal amount of hydraulic pressure flows to the rod side or the bottom side, there will be an excess on the rod side and an insufficient amount on the bottom side.
従って従来ではこれを補償する手段が種々提唱されてい
るが、何れも機構が複雑で、かつ同容量の油圧シリンダ
や油圧モータを必要とするため一般に高価となる欠点が
あった。Therefore, various means for compensating for this have been proposed in the past, but all of them have the disadvantage that they are complicated in mechanism and require hydraulic cylinders and hydraulic motors of the same capacity, making them generally expensive.
この考案はかかる欠点を除去する目的でなされたもので
、油圧シリンダのロッド側またはボトム側と接続する閉
回路に小ストロークの等価シリンダを設けて、受圧面積
差による流量の差異を吸収するようにした建設機械の油
圧回路を提供して、構造の簡素化とコストダウンを図ろ
うとするものである。This idea was made with the aim of eliminating such drawbacks, and by providing an equivalent cylinder with a small stroke in the closed circuit connected to the rod side or bottom side of the hydraulic cylinder, it absorbs the difference in flow rate due to the difference in pressure receiving area. The purpose of this project is to provide a hydraulic circuit for construction machinery that has been developed to simplify the structure and reduce costs.
以下この考案を図示の一実施例について詳述する。This invention will be described in detail below with reference to an illustrated embodiment.
図において１は可変容量ポンプ、２は油圧シノンダで、
これらの間は閉回路３及び４により接続されている。In the figure, 1 is a variable displacement pump, 2 is a hydraulic cylinder,
These are connected by closed circuits 3 and 4.
また閉回路３及び４の間にはリリーフ弁５、シャトル弁
６及び逆止弁７が設けられていて、リークなどにより不
足した油はチャージポンプ８より逆止弁７を介して各閉
回路３及び４へ補給されるようになっていると共に、閉
回路３，４の一方、例えば油圧シリンダ２のロッド側室
２、に接続された閉回路３の途中には、等価シリンダ９
が設けられている。Furthermore, a relief valve 5, a shuttle valve 6, and a check valve 7 are provided between the closed circuits 3 and 4, and the oil that is insufficient due to leakage is pumped from the charge pump 8 through the check valve 7 to each closed circuit 3. and 4, and there is an equivalent cylinder 9 in the middle of the closed circuit 3 connected to one of the closed circuits 3 and 4, for example, the rod side chamber 2 of the hydraulic cylinder 2.
is provided.
等価シリンダ９はシリンダ９ａと、このシリンダ９ａ内
に収容されたピストン９ｂ及びピストン９ｂの一端面側
より突設されたピストン杆９Ｃよりなり、シリンダ９ａ
のロッド側室９□と油圧シリンダ２のロッド側室２、が
接続されていると共に、ボトム側室９２は可変容量ポン
プ１側へ接続されている。The equivalent cylinder 9 consists of a cylinder 9a, a piston 9b housed in the cylinder 9a, and a piston rod 9C protruding from one end surface of the piston 9b.
The rod side chamber 9□ of the hydraulic cylinder 2 is connected to the rod side chamber 2 of the hydraulic cylinder 2, and the bottom side chamber 92 is connected to the variable displacement pump 1 side.
また油圧シリンダ２のロッド側室２□及びボトム側室２
°の受圧面積Ｓ１及びＳ２と等価シリンダ９のロッド側
室９□及びボトム側室９□の受圧面積Ｓ１′、Ｓ２′は
互に比例関係となるように設定されている。Also, the rod side chamber 2□ and bottom side chamber 2 of the hydraulic cylinder 2
The pressure receiving areas S1 and S2 of the cylinder 9 and the pressure receiving areas S1' and S2' of the rod side chamber 9□ and bottom side chamber 9□ of the equivalent cylinder 9 are set to be in a proportional relationship with each other.
となっている。It becomes.
なお１０は等価シリンダ９のピストン９ｂ内に組込まれ
たピストンバルブで、ピストン９ｂの移動時には閉鎖さ
れているが、ピストン９ｂがストロークエンドに達する
と、ピストン杆１０ ａがシリンダ端面に押されて開放
され、ロッド側室９□とボトム側室９□を連通して、油
圧シリンダ２と等価シリンダ９の各ストロークに差異が
生じた場合にこれを一致させるリセット機能を果してい
る。Note that 10 is a piston valve built into the piston 9b of the equivalent cylinder 9, which is closed when the piston 9b moves, but when the piston 9b reaches the stroke end, the piston rod 10a is pushed by the cylinder end face and opens. The rod side chamber 9 □ and the bottom side chamber 9 □ are communicated with each other to perform a reset function of making the strokes of the hydraulic cylinder 2 and the equivalent cylinder 9 match when a difference occurs.
しかしていま油圧シリンダ２を伸長すべく可変容量ポン
プ１より閉回路４にＱなる流量を吐出すると、
油圧シリンダ２のピストン２ａは
の速度１θ
流量の油が等価シリンダ９のロッド側室９、へ流入スる
。However, when the variable displacement pump 1 discharges a flow rate of Q into the closed circuit 4 in order to extend the hydraulic cylinder 2, the piston 2a of the hydraulic cylinder 2 has a speed of 1θ, and a flow rate of oil flows into the rod side chamber 9 of the equivalent cylinder 9. Suru.
こ扛によって等価シリンダ９のピストン９ｂは
の速度″″Ｃ″、事ト≠側室９□へ移動し、ボトム側室
９□′より
（なお式（１）より
の流量が４変容量ポンプ１へと流出
す−るよ−うになり、油圧シリンダ２のロッド側室２□
とボトム側室２２の受圧面積の差による流量の差異を上
記等価シリンダ９が吸収する。Due to this, the piston 9b of the equivalent cylinder 9 moves to the side chamber 9□ at a speed of ``''C'', and the flow rate from the bottom side chamber 9□' (from equation (1) is transferred to the 4-displacement pump 1. It starts to flow out, and the rod side chamber 2 of the hydraulic cylinder 2
The equivalent cylinder 9 absorbs the difference in flow rate due to the difference in pressure receiving area between the bottom side chamber 22 and the bottom side chamber 22.
また油圧シリンダ２が短縮する場合は上記と逆の流れと
なる。Further, when the hydraulic cylinder 2 is shortened, the flow is opposite to the above.
なお第３図に示すように等価シリンダ９を油圧シリンダ
２のボトム側室２□側に接続した閉回路４に設けてもよ
い。As shown in FIG. 3, the equivalent cylinder 9 may be provided in a closed circuit 4 connected to the bottom chamber 2□ side of the hydraulic cylinder 2.
この考案は以上詳述したように、油圧シリンダと接続す
る閉回路の途中に受圧面積が上記油圧シリンダと比例関
係にある等価シリンダを設けて、油圧シリンダのロッド
側室とボトム側室の受圧面積の差による流量の差異を上
記等価シリンダで吸収するようにしたことから、従来の
油圧シリンダと同容量の油圧シリンダを設けたり、油圧
ポンプを２連とするものに比べて小容量の等価シリンダ
を設けるだけでよく、これによって構造の簡素化とコス
トダウンが図れると共に、エンジンルームなどの少ない
スペースに容易に等価シリンダを設置することができる
ため、既存の建設機械を設計変更したり、また重量の増
大によるコストアップなどの不具合を生じない。As detailed above, this idea is based on the fact that an equivalent cylinder whose pressure receiving area is proportional to that of the hydraulic cylinder is provided in the middle of the closed circuit connected to the hydraulic cylinder, and the difference in the pressure receiving area between the rod side chamber and the bottom side chamber of the hydraulic cylinder is Since the difference in flow rate due to This not only simplifies the structure and reduces costs, but also makes it possible to easily install an equivalent cylinder in a small space such as an engine room, making it possible to change the design of existing construction machinery, or to reduce costs due to increased weight. No problems such as increased costs occur.
さらに閉回路中の容量も少なくてよいため、チャージポ
ンプやタンクの容量も小さくてよく経済的である。Furthermore, since the capacity in the closed circuit is small, the capacity of the charge pump and tank is also small, making it economical.
図面はこの考案の一実施例を示し、第１図は回路図、第
２図は等価シリンダの詳細図、第３図は他の実施例の説
明図である。
１は可変容量ポンプ、２は油圧シリンダ、２．はロッド
側室、２□はボトム側室、３及び４は閉回路、９は等価
シリンダ、９□はロッド側室、９□はボトム側室、１０
はピストンバルブ。The drawings show one embodiment of this invention, with FIG. 1 being a circuit diagram, FIG. 2 being a detailed view of an equivalent cylinder, and FIG. 3 being an explanatory diagram of another embodiment. 1 is a variable displacement pump, 2 is a hydraulic cylinder, 2. is the rod side chamber, 2□ is the bottom side chamber, 3 and 4 are closed circuits, 9 is the equivalent cylinder, 9□ is the rod side chamber, 9□ is the bottom side chamber, 10
is a piston valve.
Claims (2)
回路３，４で接続したものにおいて、上記閉回路３、ま
たは閉回路４の途中に、上記油圧シリンダ２とロッド側
室２□及びボトム側室２□の受圧面積が比例関係にある
等価シリンダ９を各シリンダ２，９のロッド側室２０，
９□またはボトム側室２□、９□同志が接続されるよう
に設けてなる建設機械の油圧回路。(1) In a system in which the variable displacement pump 1 and the hydraulic cylinder 2 are connected by closed circuits 3 and 4, the hydraulic cylinder 2 is connected to the rod side chamber 2□ and the bottom side chamber in the middle of the closed circuit 3 or the closed circuit 4. An equivalent cylinder 9 in which the pressure receiving area of 2□ is in a proportional relationship is connected to the rod side chamber 20 of each cylinder 2, 9,
9□ or bottom side chambers 2□ and 9□ are connected to each other in a hydraulic circuit for a construction machine.
ｂがストロークエンドに達したとき開放されてロッド側
室９□とボトム側室９２を連通ずるピストンバルブ１０
を設けてなる実用新案登録請求の範囲第（１）項記載の
建設機械の油圧回路。(2) In the piston 9b of the equivalent cylinder 9, the piston 9
A piston valve 10 opens when b reaches the stroke end to communicate the rod side chamber 9□ and the bottom side chamber 92.
A hydraulic circuit for a construction machine as set forth in claim (1) of the utility model registration, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15413179U JPS594165Y2 (en) | 1979-11-08 | 1979-11-08 | Construction machinery hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15413179U JPS594165Y2 (en) | 1979-11-08 | 1979-11-08 | Construction machinery hydraulic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5671503U JPS5671503U (en) | 1981-06-12 |
| JPS594165Y2 true JPS594165Y2 (en) | 1984-02-06 |
Family
ID=29384796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15413179U Expired JPS594165Y2 (en) | 1979-11-08 | 1979-11-08 | Construction machinery hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS594165Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2516043A (en) | 2013-07-09 | 2015-01-14 | Siemens Vai Metals Tech Gmbh | A rolling mill edger |
-
1979
- 1979-11-08 JP JP15413179U patent/JPS594165Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5671503U (en) | 1981-06-12 |
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