JPH0320373Y2 - - Google Patents
Info
- Publication number
- JPH0320373Y2 JPH0320373Y2 JP13528282U JP13528282U JPH0320373Y2 JP H0320373 Y2 JPH0320373 Y2 JP H0320373Y2 JP 13528282 U JP13528282 U JP 13528282U JP 13528282 U JP13528282 U JP 13528282U JP H0320373 Y2 JPH0320373 Y2 JP H0320373Y2
- Authority
- JP
- Japan
- Prior art keywords
- dump
- cylinder
- bucket
- relief
- valve
- 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
- 238000010276 construction Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
Description
【考案の詳細な説明】
この考案は作業機にバケツトを具えた建設機械
の作業機油圧回路に関する。[Detailed Description of the Invention] This invention relates to a working machine hydraulic circuit for a construction machine equipped with a bucket.
一般にドーザシヨベルのようなバケツトを具え
た建設機械では、ドージング及びバツクグレーデ
イングなどの整地作業が可能であり、これら作業
は整地面の凸凹に応じてバケツトを上下動させな
がら行う。また上記作業機の油圧回路としては、
従来では第１図に示す回路が採用されている。す
なわち油圧ポンプａより吐出された油圧をダンプ
操作弁ｂを介してダンプシリンダｃへ供給するこ
とにより、バケツトのダンプを、そしてリフト操
作弁ｄを介してリフトシリンダｅへ供給すること
によりバケツトの上下動を夫々行つており、ダン
プシリンダｃのヘッド側回路には例えば305Kg／
cm2でリリ−フするリリーフ弁ｆが、またボトム側
回路には250Kg／cm2でリリーフするリリーフ弁ｇ
が夫々接続されている。 In general, construction machines equipped with a bucket belt such as a dozer shovel are capable of leveling work such as dozing and back grading, and these operations are performed while moving the bucket up and down depending on the unevenness of the leveled surface. In addition, the hydraulic circuit of the above working machine is as follows:
Conventionally, a circuit shown in FIG. 1 has been adopted. That is, by supplying the hydraulic pressure discharged from the hydraulic pump a to the dump cylinder c via the dump operation valve b, the bucket can be dumped, and by supplying it to the lift cylinder e via the lift operation valve d, the bucket can be moved up and down. For example, the head side circuit of dump cylinder c is loaded with 305 kg/kg.
There is a relief valve f that provides relief at cm2 , and a relief valve g that provides relief at 250Kg/ cm2 in the bottom circuit.
are connected to each other.
すなわち作業機の構造上、バツクグレーデイン
グ作業時ダンプシリンダｃにより大きな力が作用
するため、ダンプシリンダｃのヘッド側回路のリ
リ−フ圧を高くしている。しかし上記油圧回路で
は、バケツトをダンプした状態で上昇させた場
合、バケツトの上昇途中でダンプストツパにチル
トレバが当接すると、ダンプシリンダｃの伸長方
向に力が作用し、ダンプシリンダｃのヘッド側が
高圧となるが、ヘッド側回路のリリ−フ圧回路の
リリ−フ圧は油圧ポンプａの吐出側に設けたリリ
−フ弁ｈのリリ−フ圧より高いため、リフトシリ
ンダｅ側が負けて、それ以上バケツトが上昇でき
ない不具合があつた。 That is, due to the structure of the working machine, a larger force acts on the dump cylinder c during back grading work, so the relief pressure in the head side circuit of the dump cylinder c is increased. However, in the above hydraulic circuit, when the bucket is raised in a dumped state, when the tilt lever comes into contact with the dump stopper during the ascent of the bucket, a force is applied in the direction of extension of the dump cylinder c, and the head side of the dump cylinder c becomes under high pressure. However, since the relief pressure in the relief pressure circuit of the head side circuit is higher than the relief pressure of the relief valve h provided on the discharge side of the hydraulic pump a, the lift cylinder e side loses, and no more There was a problem where the bucket could not rise.
この考案はかかる不具合を改善する目的でなさ
れたもので、ダンプシリンダのヘッド側回路に、
リリ−圧の異なる複数個のリリ−フ弁を設けて、
作業内容に応じてこれらリリ−フ弁を選択するよ
うにした建設機械の作業機油圧回路を提供して、
従来の不具合を解消しようとするものである。 This idea was made with the purpose of improving this problem, and the head side circuit of the dump cylinder is
By providing multiple relief valves with different relief pressures,
By providing a working machine hydraulic circuit for construction machinery in which these relief valves are selected according to the work content,
This is an attempt to solve the problems of the past.
以下この考案を第２図以下に示す一実施例を参
照して詳述する。第２図はドーザシヨベルなどの
建設機械を概略的に示したもので、１は履帯式足
まわり２により自走自在な車体で、この車体１の
前部に作業機３が装着されている。作業機３は基
端側が車体１の前部に枢着され、かつリフトシリ
ンダ４により上下動自在なリフトアーム５と、そ
のリフトアーム５の先端に枢着されたバケツト６
とを有し、リフトアーム５のほぼ中間部間を連結
する横杆５ａからは斜め前方にブラケツト５ｂが
突説され、これらブラケツト５ｂの先端部にチル
トレバ７の中間部が枢支されている。上記チルト
レバ７の一端側は上記バケツト６の後面にリンク
２０を介して接続されていると共に、チルトレバ
７の他端側は基端側が上記車体１に枢着されたダ
ンプシリンダ８のピストン杆８ａ先端に枢着され
ている。 This invention will be described in detail below with reference to an embodiment shown in FIG. 2 and subsequent figures. FIG. 2 schematically shows a construction machine such as a dozer shovel. Reference numeral 1 denotes a vehicle body that can move freely by a track-type suspension 2, and a work implement 3 is attached to the front part of the vehicle body 1. The work equipment 3 includes a lift arm 5 whose base end is pivotally attached to the front part of the vehicle body 1 and can be moved up and down by a lift cylinder 4, and a bucket 6 pivoted at the tip of the lift arm 5.
Brackets 5b project obliquely forward from a horizontal rod 5a that connects approximately the middle portions of the lift arm 5, and the middle portion of the tilt lever 7 is pivotally supported at the tips of these brackets 5b. One end of the tilt lever 7 is connected to the rear surface of the bucket 6 via a link 20, and the other end of the tilt lever 7 is connected to the tip of a piston rod 8a of a dump cylinder 8 whose base end is pivotally connected to the vehicle body 1. It is pivoted to.
そして上記リフトシリンダ４及びダンプシリン
ダ８に第３図に示す油圧配管がなされている。 The lift cylinder 4 and dump cylinder 8 are provided with hydraulic piping as shown in FIG.
すなわち１０は油圧ポンプで、この油圧ポンプ
１０より吐出された油圧はダンプ操作弁１１を介
してダンプシリンダ８へ供給され、また一部はリ
フト操作弁１２を介してリフトシリンダ４へ供給
されている。上記ダンプシリンダ８のボトム側回
路１３には例えば250Kg／cm2でリリ−フするリリ
−フ弁１４が接続されていると共に、ダンプシリ
ンダ８のヘッド側回路１５には電磁弁などの切換
え弁１６を介して、夫々セツト圧の異なる複数
個、例えば２個のリリ−フ弁１７，１８が接続さ
れている。上記切換弁１６はチルトレバ７に設け
たダンプストツパ７ａがリフトアーム５の横杆５
ａに当接したとき、チルトレバ７に設けた作動部
７ｂにより作動されるリミツトスイツチ１９によ
り切換えられるようになつており、これによつて
次のようにリリ−フ弁１７，１８が選択される。 That is, 10 is a hydraulic pump, and the hydraulic pressure discharged from this hydraulic pump 10 is supplied to the dump cylinder 8 via the dump operation valve 11, and a part is supplied to the lift cylinder 4 via the lift operation valve 12. . A relief valve 14 that provides relief at, for example, 250 kg/cm 2 is connected to the bottom side circuit 13 of the dump cylinder 8, and a switching valve 16 such as a solenoid valve is connected to the head side circuit 15 of the dump cylinder 8. A plurality of relief valves, for example two relief valves 17 and 18, each having a different set pressure, are connected through the valve. The above-mentioned switching valve 16 has a dump stopper 7a provided on the tilt lever 7 which is connected to the side rod 5 of the lift arm 5
When it comes into contact with the tilt lever 7, the limit switch 19 is operated by an operating portion 7b provided on the tilt lever 7, thereby selecting the relief valves 17 and 18 as follows.
しかしてバツクグレーデイングなどの均し作業
に際しては、バケツト６を第２図仮想線に示す位
置にダンプして車体１を後進させ、バケツト６の
先端で均し作業を行うが、このとき切換え弁１６
はポジシヨン１６1にあつて高圧側リリ−フ弁１
７を選択しており、従つて均し作業中ダンプシリ
ンダ８のヘッド側が高圧となつても、リリ−フ弁
１７はリリ−フせず、これによつてバツクグレー
デイング作業が可能となる。 However, when performing leveling work such as back grading, the bucket cart 6 is dumped to the position shown in the imaginary line in Figure 2, the vehicle body 1 is moved backwards, and the leveling work is performed using the tip of the bucket cart 6. At this time, the switching valve 16
is in position 16 1 , high pressure side relief valve 1
7 is selected, and therefore, even if the head side of the dump cylinder 8 becomes high pressure during leveling work, the relief valve 17 does not relieve, thereby making it possible to perform back grading work.
次にバケツト６をダンプした状態で上昇させた
場合、チルトレバ７のダンプストツパ７ａがリフ
トアーム５に当接する（第４図実線参照）と同時
に、リミツトスイツチ１９が作動して、切換え弁
１６をポジシヨン１６2へ切換え、低圧側リリ−
フ弁１８を選択する。これによつてダンプシリン
ダ８のヘッド側のリリ−フ圧は、リフトシリンダ
４のリリ−フ圧を決めるリリ−フ弁１９のセツト
圧より低くなり、これによつてリフトシリンダ４
が、ダンプシリンダ８に負けることがないので、
さらにバケツト６の上昇が可能となる。 Next, when the bucket 6 is raised in the dumped state, the dump stopper 7a of the tilt lever 7 comes into contact with the lift arm 5 (see the solid line in FIG. 4), and at the same time, the limit switch 19 is activated and the switching valve 16 is moved to the position 16 2 Switch to low pressure side release
Select the valve 18. As a result, the relief pressure on the head side of the dump cylinder 8 becomes lower than the set pressure of the relief valve 19 that determines the relief pressure of the lift cylinder 4.
However, since it does not lose to dump cylinder 8,
Furthermore, the bucket 6 can be raised.
なお上記実施例では、リリ−フ弁１７，１８を
選択する切換え弁１６をリミツトスイツチ１９で
切換えるようにしたが手動で切換えるようにして
も勿論よい。 In the above embodiment, the switching valve 16 for selecting the relief valves 17 and 18 is switched by the limit switch 19, but it may of course be switched manually.
この考案は以上詳述したようにダンプシリンダ
のヘッド側回路に複数個のリリ−フ弁を設けて、
作業内容に応じてこれらリリ−フ弁を選択するよ
うにしたことから、バツクグレーテイングのよう
な均し作業は高圧のセツト圧で能率よく行なえる
ようになる。またバケツトをダンプした状態で上
昇させる場合、低圧側リリ−フ弁が選択されるた
め、リフトシリンダがダンプシリンダに負けて、
バケツトの上昇が途中から困難になるなどの不具
合も解消することができる。 As described in detail above, this idea is based on providing a plurality of relief valves in the head side circuit of the dump cylinder.
Since these relief valves are selected depending on the content of the work, leveling work such as back grating can be performed efficiently with a high set pressure. In addition, when lifting a bucket after dumping, the low-pressure side relief valve is selected, so the lift cylinder loses control to the dump cylinder.
Problems such as difficulty in raising the bucket can also be resolved.
第１図は従来の油圧回路を示す回路図、第２図
はこの考案の一実施例になる建設機械の側面図、
第３図は同油圧回路図、第４図はリミツトスイツ
チ部分の拡大図である。
３は作業機、４はリフトシリンダ、６はバケツ
ト、８はダンプシリンダ、１０は油圧ポンプ、１
１はダンプ操作弁、１２はリフト操作弁、１５は
ヘッド側回路、１６は切換え弁、１７及び１８は
リリ−フ弁。
Figure 1 is a circuit diagram showing a conventional hydraulic circuit, Figure 2 is a side view of a construction machine that is an embodiment of this invention.
FIG. 3 is a hydraulic circuit diagram of the same, and FIG. 4 is an enlarged view of the limit switch portion. 3 is a working machine, 4 is a lift cylinder, 6 is a bucket, 8 is a dump cylinder, 10 is a hydraulic pump, 1
1 is a dump operation valve, 12 is a lift operation valve, 15 is a head side circuit, 16 is a switching valve, and 17 and 18 are relief valves.
Claims (1)
作弁１１を介してダンプシリンダ８へ、また一部
をリフト操作弁１２を介してリフトシリンダ４へ
供給することにより、作業機３のバケツト６をダ
ンプし、また上下動するものにおいて上記ダンプ
シリンダ８のヘッド側回路１５に、セツト圧の異
なる複数個のリリーフ弁１７，１８と、これらリ
リーフ弁１７，１８を選択する切換弁１６を接続
してなる建設機械の作業機油圧回路。 The bucket 6 of the working machine 3 is dumped by supplying the hydraulic pressure discharged from the hydraulic pump 10 to the dump cylinder 8 via the dump operation valve 11 and a part of it to the lift cylinder 4 via the lift operation valve 12. In addition, in a device that moves up and down, a construction in which a plurality of relief valves 17, 18 with different set pressures and a switching valve 16 for selecting these relief valves 17, 18 are connected to the head side circuit 15 of the dump cylinder 8. Machine work equipment hydraulic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13528282U JPS5943567U (en) | 1982-09-08 | 1982-09-08 | Construction machinery hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13528282U JPS5943567U (en) | 1982-09-08 | 1982-09-08 | Construction machinery hydraulic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5943567U JPS5943567U (en) | 1984-03-22 |
| JPH0320373Y2 true JPH0320373Y2 (en) | 1991-05-01 |
Family
ID=30304543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13528282U Granted JPS5943567U (en) | 1982-09-08 | 1982-09-08 | Construction machinery hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5943567U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294031A (en) * | 1985-06-19 | 1986-12-24 | Hitachi Constr Mach Co Ltd | Oil-pressure circuit for excavator |
| JP5277449B2 (en) * | 2009-03-26 | 2013-08-28 | 株式会社小松製作所 | Work vehicle, work vehicle control method and control device |
| JP5608252B2 (en) | 2013-02-26 | 2014-10-15 | カヤバ工業株式会社 | Actuator |
-
1982
- 1982-09-08 JP JP13528282U patent/JPS5943567U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5943567U (en) | 1984-03-22 |
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