JPH07119472B2 - Hydraulic circuit structure of backhoe device - Google Patents
Hydraulic circuit structure of backhoe deviceInfo
- Publication number
- JPH07119472B2 JPH07119472B2 JP1238573A JP23857389A JPH07119472B2 JP H07119472 B2 JPH07119472 B2 JP H07119472B2 JP 1238573 A JP1238573 A JP 1238573A JP 23857389 A JP23857389 A JP 23857389A JP H07119472 B2 JPH07119472 B2 JP H07119472B2
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- oil
- hydraulic
- descending
- 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 - Lifetime
Links
Landscapes
- Operation Control Of Excavators (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はクローラ走行装置付の旋回台やホイルローダの
後部に取り付けられるバックホウ装置において、ブーム
の上下駆動用の油圧回路に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit for vertically moving a boom in a backhoe device attached to the rear of a swivel with a crawler traveling device or a wheel loader.
バックホウ装置におけるブームの上下駆動用の油圧回路
としては、主副の2組のポンプからの油路を合流させ
て、ブーム上下駆動用の油圧シリンダにおける上昇側油
室にこの油路を接続すると共に、この合流点よりもポン
プ側にブーム上下操作用で3位置切換式の主・副制御弁
を各々設けているものがある。このように2組のポンプ
からの作動油を合流させて前記油圧シリンダに供給する
ことにより、ブーム上昇速度を大きくして作業能率を高
めることができるのである。As a hydraulic circuit for vertically moving the boom in the backhoe, the oil passages from the two sets of main and sub pumps are merged, and this oil passage is connected to the ascending oil chamber in the hydraulic cylinder for vertically driving the boom. In some cases, a three-position switchable main / sub control valve for boom up / down operation is provided on the pump side of this junction. By thus combining the hydraulic oils from the two sets of pumps and supplying the hydraulic oils to the hydraulic cylinder, the boom ascending speed can be increased and the work efficiency can be increased.
逆に、ブームの下降は通常低速で行うが、バックホウ装
置ではブームを高速で下降操作しブーム先端のバケット
を土中に突入させて掘削作業を行ったり、バケットの背
面を斜面等に叩き付けて土を押し固める作業を行う場合
がある。そこで、ブームの下降速度を高低2段に変速で
きるようにすることが提案されており、その構造が第5
図及び第6図に示されている。On the other hand, the boom is normally lowered at a low speed, but with the backhoe, the boom is lowered at a high speed to cause the bucket at the tip of the boom to enter the soil for excavation work, or the back surface of the bucket is struck on a slope or the like to remove soil. There is a case to work to press. Therefore, it has been proposed that the lowering speed of the boom can be changed to high and low two stages.
Shown in Figures and 6.
つまり、主制御弁(17)と副制御弁(38)とを、その両
スプール(17a),(38a)が略平行になるように並設
し、この両スプール(17a),(38a)に亘って天秤アー
ム(55)を架設すると共に、天秤アーム(55)の中間部
分と操作レバー(41)(人為操作具に相当)とをリンク
機構(56)を介して機械的に連動連結した構造である。
そして、天秤アーム(55)の副制御弁(38)側に上下ス
ライド操作自在にピン(57)を取り付けると共に、この
ピン(57)を下降側に付勢するスプリング(58)、及び
ピン(57)を持ち上げ操作するソレノイド(59)を設け
た構造である。That is, the main control valve (17) and the sub control valve (38) are arranged side by side so that their spools (17a), (38a) are substantially parallel to each other, and these spools (17a), (38a) A structure in which a balance arm (55) is laid across and a middle portion of the balance arm (55) and an operation lever (41) (corresponding to an artificial operation tool) are mechanically interlocked via a link mechanism (56). Is.
Then, a pin (57) is attached to the auxiliary control valve (38) side of the balance arm (55) so as to be vertically slidable, and a spring (58) and a pin (57) for urging the pin (57) downward. ) Is provided with a solenoid (59) for lifting.
以上の構造により、操作レバー(41)を下降位置(D)
に操作すると天秤アーム(55)全体が図上(イ)方向に
移動しようとするが、天秤アーム(55)のピン(57)の
下端が固定側の係合部(60)に係合して天秤アーム(5
5)の副制御弁(38)側が中立位置(N)で止められ
て、ピン(57)付近を支点として天秤アーム(55)は
(イ)方向に揺動して行く。これにより、主制御弁(1
7)のスプール(17a)のみが下降位置(D)に押し込ま
れることになり、ブームからの作動油が主制御弁(17)
のみを介して排油されることによって、ブームが低速で
下降して行くのである。With the above structure, move the operation lever (41) to the lowered position (D).
When operated, the entire balance arm (55) tries to move in the direction of (a) in the figure, but the lower end of the pin (57) of the balance arm (55) engages with the fixed side engagement part (60). Balance arm (5
The sub control valve (38) side of 5) is stopped at the neutral position (N), and the balance arm (55) swings in the (a) direction around the pin (57) as a fulcrum. This allows the main control valve (1
Only the spool (17a) of 7) will be pushed into the lowered position (D), and the hydraulic oil from the boom will be fed to the main control valve (17).
The boom is lowered at a low speed by draining oil through the chisel.
そして、ブームの下降速度を高速に切換える場合には、
操作レバー(41)のスイッチ(61)を押してソレノイド
(59)によりピン(57)を引き上げる。これにより、操
作レバー(41)を下降位置(D)に操作すると天秤アー
ム(55)全体が(イ)方向に移動し、主副制御弁(1
7),(38)の両スプール(17a),(38a)が下降位置
(D)に押し込まれることになる。従って、ブームから
の作動油が主副制御弁(17),(38)の両方から一気に
排油されることになって、ブームが高速で下降して行く
のである。And when changing the descending speed of the boom to high speed,
Push the switch (61) of the operating lever (41) and pull up the pin (57) by the solenoid (59). As a result, when the operation lever (41) is operated to the lowered position (D), the entire balance arm (55) moves in the (a) direction, and the main / sub control valve (1
Both spools (17a) and (38a) of 7) and (38) are pushed into the lowered position (D). Therefore, the hydraulic oil from the boom is drained from both the main and sub control valves (17) and (38) at once, and the boom descends at a high speed.
逆に、操作レバー(41)を上昇位置(U)に操作すると
天秤アーム(55)全体が紙面右方に移動して、両スプー
ル(17a),(38a)が上昇位置(U)に引き出される。
この状態で主副制御弁(17),(38)からブームに作動
油が供給されて、ブームが高速で上昇操作される。On the contrary, when the operation lever (41) is operated to the raised position (U), the entire balance arm (55) moves rightward on the paper surface, and the spools (17a) and (38a) are pulled out to the raised position (U). .
In this state, hydraulic oil is supplied to the boom from the main and sub control valves (17) and (38), and the boom is raised at high speed.
前述の構造ではブームの下降時にブーム用の油圧シリン
ダからの排油量を制御して、ブーム下降速度を高低2段
に変速操作している。従って、ブームの下降速度はブー
ムの自重により定まることになる。In the above-described structure, the amount of oil discharged from the hydraulic cylinder for the boom is controlled when the boom is lowered, and the boom lowering speed is changed into two stages, high and low. Therefore, the descending speed of the boom is determined by the weight of the boom.
このようにブームを自重で下降させる構造では、高速側
の下降速度に限界がある為に、硬い土質の作業地におい
て掘削作業を行う場合には十分な掘削が行えない場合が
生ずる。又、バケットによる土の押し固め作業が十分に
行えない場合も生ずる。In such a structure in which the boom is lowered by its own weight, there is a limit to the descending speed on the high speed side, and therefore, when excavation work is performed in a hard soil work site, sufficient excavation may not be performed. In addition, the case where the soil compaction work by the bucket cannot be performed sufficiently may occur.
本発明は、掘削作業及び土の押し固め作業が十分に行え
るように構成することを目的としている。An object of the present invention is to make it possible to sufficiently perform excavation work and soil compaction work.
本発明の特徴はバックホウ装置の油圧回路構造を次のよ
うに構成することにある。つまり、 ブーム上下駆動用の複動型の油圧シリンダと第1ポ
ンプとを、前記油圧シリンダの上昇側油室に作動油を供
給する上昇位置、中立位置、前記油圧シリンダの下降側
油室に作動油を供給する下降位置の3位置に切換可能な
主制御弁を介して接続し、前記第1ポンプから上昇側油
室への上昇側油路及び下降側油室への下降側油路と第2
ポンプとを、前記上昇側油路に作動油を供給する上昇位
置、中立位置、下降側油路に作動油を供給する下降位置
の3位置に切換可能な副制御弁を介して接続し、前記主
制御弁及び副制御弁を同方向に操作可能な人為操作具を
備えると共に、副制御弁から下降側油路への副下降側油
路に、人為操作可能な開閉弁を備えてあることにあり、
そして、 ブーム上下駆動用の複動型の油圧シリンダと第1ポ
ンプとを、前記油圧シリンダの上昇側油室に作動油を供
給する上昇位置、中立位置、前記油圧シリンダの下降側
油室に作動油を供給する下降位置の3位置に切換可能な
主制御弁を介して接続し、前記第1ポンプから上昇側油
室への上昇側油路及び下降側油室への下降側油路と第2
ポンプとを、前記上昇側油路に作動油を供給する上昇位
置、中立位置、下降側油路に作動油を供給する下降位置
の3位置に切換可能な副制御弁を介して接続すると共
に、主制御弁と副制御弁の両方を下降位置に操作可能な
状態と主制御弁のみを下降位置に操作可能な状態とに切
換え可能な切換機構、並びに、主制御弁及び副制御弁の
両方を上昇位置に操作可能な連係機構を介して、人為操
作具と主制御弁及び副制御弁を連動連結してあることに
あり、その作用及び効果は次の通りである。A feature of the present invention is that the hydraulic circuit structure of the backhoe device is configured as follows. That is, the double-acting hydraulic cylinder for vertically driving the boom and the first pump are operated in the rising position for supplying hydraulic oil to the rising oil chamber of the hydraulic cylinder, the neutral position, and the falling oil chamber of the hydraulic cylinder. It is connected via a main control valve that can be switched to three lower positions for supplying oil, and is connected to a rising oil passage from the first pump to the rising oil chamber and a falling oil passage to the falling oil chamber. Two
The pump is connected via a sub-control valve that can be switched to three positions of an ascending position for supplying hydraulic oil to the ascending oil passage, a neutral position, and a descending position for supplying hydraulic oil to the descending oil passage, The main control valve and the sub-control valve are equipped with an artificial operation tool that can be operated in the same direction, and the sub-downward oil passage from the sub-control valve to the descending oil passage is equipped with an on-off valve that can be manually operated. Yes,
Then, the double-acting hydraulic cylinder for vertically moving the boom and the first pump are operated in a rising position for supplying hydraulic oil to the rising side oil chamber of the hydraulic cylinder, a neutral position, and a falling side oil chamber of the hydraulic cylinder. It is connected via a main control valve that can be switched to three lower positions for supplying oil, and is connected to a rising oil passage from the first pump to the rising oil chamber and a falling oil passage to the falling oil chamber. Two
The pump is connected through a sub-control valve that can be switched to three positions of an ascending position for supplying hydraulic oil to the ascending oil passage, a neutral position, and a descending position for supplying hydraulic oil to the descending oil passage, A switching mechanism that can switch both the main control valve and the sub-control valve to the lowered position and the main control valve only to the lowered position, and both the main control valve and the sub-control valve. The main control valve and the sub control valve are interlockingly connected to the human-operated operation tool through the linkage mechanism that can be operated to the raised position, and the operation and effect are as follows.
前項のように構成すると、例えば第1図に示すよう
に、開閉弁(43)を閉側に操作した状態で人為操作具
(41)を下降側に操作すると、主制御弁(17)及び副制
御弁(38)の両者共に下降位置(17D),(38D)に操作
されるが、第2ポンプ(10)からの作動油が開閉弁(4
3)により遮断されて、第1ポンプ(9)からの作動油
のみが油圧シリンダ(16)の下降側油室(16b)に供給
される。これが、ブームが低速で下降する状態である。With the configuration as described in the preceding paragraph, for example, as shown in FIG. 1, when the manipulator (41) is operated downward while the on-off valve (43) is operated closed, the main control valve (17) and the auxiliary control valve (17) Both control valves (38) are operated to the lowered positions (17D) and (38D), but the hydraulic oil from the second pump (10) is used to open and close the open / close valve (4).
It is shut off by 3) and only the hydraulic oil from the first pump (9) is supplied to the descending oil chamber (16b) of the hydraulic cylinder (16). This is the state in which the boom descends at a low speed.
そして、前記開閉弁(43)を開側に操作して人為操作具
(41)を下降側に操作すると、第1ポンプ(9)及び第
2ポンプ(10)からの作動油が主制御弁(17)及び副制
御弁(38)を介して、油圧シリンダ(16)の下降側油室
(16b)に供給される。これにより、油圧シリンダ(1
6)が高速で作動してブームが高速で下降操作される。When the on-off valve (43) is operated to the open side and the manual operation tool (41) is operated to the down side, hydraulic oil from the first pump (9) and the second pump (10) is transferred to the main control valve ( It is supplied to the descending side oil chamber (16b) of the hydraulic cylinder (16) via the auxiliary control valve (38) and the sub control valve (38). This allows the hydraulic cylinder (1
6) operates at high speed, and the boom is moved down at high speed.
又、人為操作具(41)を上昇側に操作すると主制御弁
(17)及び副制御弁(38)の両者共に上昇位置(17
U),(38U)に操作される。これにより、第1ポンプ
(9)及び第2ポンプ(10)の両方からの作動油が油圧
シリンダ(16)の上昇側油室(16a)に供給されて、ブ
ームが高速で上昇操作されるのである。Further, when the manual operation tool (41) is operated to the ascending side, both the main control valve (17) and the sub control valve (38) are at the ascending position (17).
U), (38U). As a result, the hydraulic oil from both the first pump (9) and the second pump (10) is supplied to the ascending side oil chamber (16a) of the hydraulic cylinder (16), and the boom is operated at a high speed. is there.
又、前項のように構成すると、人為操作具を下降側に
操作した場合、主制御弁と副制御弁の両方が下降位置に
操作される状態と、主制御弁のみが下降位置に操作され
る状態が得られる。Further, when configured as in the preceding paragraph, when the human operation tool is operated to the descending side, both the main control valve and the sub control valve are operated to the descending position, and only the main control valve is operated to the descending position. The state is obtained.
従って、主制御弁と副制御弁の両方が下降位置になる
と、第1ポンプ及び第2ポンプからの両方の作動油が油
圧シリンダの下降側油室に供給されることになり、ブー
ムが高速で下降する。又、主制御弁のみが下降位置とな
ると、第1ポンプからの作動油のみが油圧シリンダの下
降側油室に供給されることになるので、ブームは低速で
下降して行く。Therefore, when both the main control valve and the sub control valve are in the lowered position, both operating oils from the first pump and the second pump are supplied to the descending side oil chamber of the hydraulic cylinder, and the boom moves at high speed. To descend. Further, when only the main control valve is in the lowered position, only the hydraulic oil from the first pump is supplied to the descending side oil chamber of the hydraulic cylinder, so that the boom descends at a low speed.
又、人為操作具を上昇側に操作すると主制御弁及び副制
御弁の両者共に上昇位置に操作される。これにより、第
1ポンプ及び第2ポンプの両方からの作動油が油圧シリ
ンダの上昇側油室に供給されて、ブームが高速で上昇操
作されるのである。Further, when the manual operation tool is operated to the up side, both the main control valve and the sub control valve are operated to the up position. As a result, hydraulic oil from both the first pump and the second pump is supplied to the ascending side oil chamber of the hydraulic cylinder, and the boom is operated to ascend at a high speed.
以上のようにブームの自重に加えて第1及び第2ポンプ
からの作動油により油圧シリンダを下降側に作動させる
ように構成することにより、ブームをより高速で強力に
下降させることができた。これによって、硬い土質であ
っても十分な掘削作業が行え、且つ、十分な土の押し固
め作業が行えて作業能率の向上を図ることができた。As described above, in addition to the boom's own weight, the hydraulic cylinders are actuated downward by the hydraulic oil from the first and second pumps, whereby the boom can be lowered at a high speed and strongly. As a result, sufficient excavation work can be performed even with hard soil, and sufficient soil compaction work can be performed to improve work efficiency.
又、ブームの低速での下降操作及び高速での上昇操作も
行えるので、本発明は従来構造の機能を損なうものでは
ない。Further, since the lowering operation of the boom at a low speed and the raising operation at a high speed can be performed, the present invention does not impair the function of the conventional structure.
以下、本発明の実施例をバックホウにより図面に基づい
て説明する。Embodiments of the present invention will be described below with reference to the drawings using a backhoe.
第2図に示すように左右一対のクローラ走行装置(1)
の上部に、バックホウ装置(2)を備えた旋回台(3)
を設け、前部にドーザ(7)を設けてバックホウを構成
している。このバックホウ装置(2)は、ブーム
(4)、アーム(5)、バケット(6)等で構成されて
おり、旋回台(3)前部の縦軸芯(P1)周りにバックホ
ウ装置(2)全体が左右に揺動可能に支持されている。As shown in FIG. 2, a pair of left and right crawler traveling devices (1)
A swivel base (3) with a backhoe device (2) on top of the
And a dozer (7) are provided in the front part to form a backhoe. The backhoe device (2) includes a boom (4), an arm (5), a bucket (6), and the like, and the backhoe device (2) is provided around the vertical axis (P 1 ) of the front part of the swivel base (3). ) The whole is supported so that it can swing to the left and right.
次に、このバックホウの油圧回路構成について詳述する
と第1図に示すように、エンジン(8)により3組の第
1、第2、第3ポンプ(9),(10),(11)が駆動さ
れている。そして、第1ポンプ(9)からの油路(22)
には右のクローラ走行装置(1)用の油圧モータ(14
R)に対する制御弁(23)、ブーム(4)上下駆動用の
油圧シリンダ(16)に対する主制御弁(17)、バケット
(6)揺動駆動用の油圧シリンダ(24)に対する制御弁
(25)が接続されており、制御弁(25)からの油路(2
6)が第2ポンプ(10)側の合流弁(13)に接続されて
いる。Next, the hydraulic circuit configuration of the backhoe will be described in detail. As shown in FIG. 1, three sets of first, second and third pumps (9), (10) and (11) are driven by the engine (8). Being driven. And the oil passage (22) from the first pump (9)
Includes a hydraulic motor (14) for the right crawler traveling device (1).
R) control valve (23), boom (4) vertical control hydraulic cylinder (16) main control valve (17), bucket (6) swing drive hydraulic cylinder (24) control valve (25) Is connected to the oil passage (2 from the control valve (25).
6) is connected to the merging valve (13) on the second pump (10) side.
第2ポンプ(10)からの油路(12)には合流弁(13)、
左のクローラ走行装置(1)用の油圧モータ(14L)に
対する制御弁(15)、バックホウ装置(2)におけるブ
ーム(4)上下駆動用の油圧シリンダ(16)に対する副
制御弁(38)、バックホウ装置(2)におけるアーム
(5)揺動駆動用の油圧シリンダ(18)に対する制御弁
(19)、予備油圧装置連結用の予備ポート(20)に対す
る制御弁(21)が接続されている。そして、ブーム
(4)用の主制御弁(17)から油圧シリンダ(16)の上
昇側油室(16a)に接続されている上昇側油路(36)、
及び下降側油室(16b)に接続されている下降側油路(3
9)に対して、副制御弁(38)からの副上昇側油路(3
7)及び副下降側油路(40)が接続されているのであ
る。In the oil passage (12) from the second pump (10), the merging valve (13),
Control valve (15) for the hydraulic motor (14L) for the left crawler traveling device (1), auxiliary control valve (38) for the hydraulic cylinder (16) for boom (4) vertical drive in the backhoe device (2), backhoe The control valve (19) for the hydraulic cylinder (18) for swinging the arm (5) in the device (2) and the control valve (21) for the auxiliary port (20) for connecting the auxiliary hydraulic device are connected. Then, an ascending oil passage (36) connected from the main control valve (17) for the boom (4) to the ascending oil chamber (16a) of the hydraulic cylinder (16),
And the lower oil passage (3b) connected to the lower oil chamber (16b).
9) to the auxiliary ascending oil passage (3
7) and the subordinate descending oil passage (40) are connected.
ただし、制御弁(19),(21)において副制御弁(38)
からの作動油は通過又は遮断されるだけで、油圧シリン
ダ(18)又は予備ポート(20)には供給されない。そし
て、合流弁(13)と制御弁(15)の間から油路(34)が
分岐すると共に、この油路(34)が制御弁(19),(2
1)に並列状に接続されており、この油路(34)からの
作動油が油圧シリンダ(18)及び予備ポート(20)に供
給されるのである。However, in the control valves (19) and (21), the sub control valve (38)
The hydraulic oil from the cylinder is only passed or blocked, and is not supplied to the hydraulic cylinder (18) or the backup port (20). Then, the oil passage (34) is branched from between the confluence valve (13) and the control valve (15), and the oil passage (34) is connected to the control valves (19), (2).
1) is connected in parallel, and the hydraulic oil from this oil passage (34) is supplied to the hydraulic cylinder (18) and the spare port (20).
第3ポンプ(11)からの油路(27)においては、旋回台
(3)旋回駆動用の油圧モータ(28)に対する制御弁
(29)、バックホウ装置(2)を縦軸芯(P1)周りに揺
動駆動する油圧シリンダ(30)に対する制御弁(31)、
ドーザ(7)揺動駆動用の油圧シリンダ(32)に対する
制御弁(33)が接続されている。そして、制御弁(33)
からの油路(35)が第2ポンプ(10)側における油路
(34)(制御弁(19)への分岐点よりも合流弁(13)側
の部分)に接続されているのであり、この油路(35)に
低圧リリーフ弁(47)が接続されているのである。In the oil passage (27) from the third pump (11), the control valve (29) for the hydraulic motor (28) for swivel base (3) and swivel drive, the backhoe device (2) are connected to the vertical axis (P 1 ). A control valve (31) for the hydraulic cylinder (30) that swings around,
A control valve (33) is connected to a hydraulic cylinder (32) for swinging the dozer (7). And control valve (33)
Is connected to the oil passage (34) on the second pump (10) side (the portion on the confluence valve (13) side from the branch point to the control valve (19)). The low pressure relief valve (47) is connected to the oil passage (35).
前記主副制御弁(17),(38)は上昇位置(17U),(3
8U)、中立位置(17N),(38N)、下降位置(17D),
(38D)の3位置切換式であり、両下降位置(17D),
(38D)において油圧シリンダ(16)の上昇側油室(16
a)からの排油に対して抵抗を与える絞り部(17b),
(38b)が設けられている。そして、1本の操作レバー
(41)(人為操作具に相当)と主副制御弁(17),(3
8)が連係機構(42)により連動連結されており、この
操作レバー(41)により主副制御弁(17),(38)を同
時に、且つ、同方向に操作可能となっている。The main and sub control valves (17), (38) are in the raised positions (17U), (3
8U), neutral position (17N), (38N), lowered position (17D),
(38D) 3 position switching type, both lower position (17D),
In (38D), the oil chamber (16
A throttle (17b) that gives resistance to oil discharged from a),
(38b) is provided. Then, one operation lever (41) (corresponding to an artificial operation tool) and the main / sub control valves (17), (3
8) is interlockingly connected by a linkage mechanism (42), and the operating lever (41) allows the main and sub control valves (17) and (38) to be operated simultaneously and in the same direction.
そして、副制御弁(38)からの副下降側油路(40)に
は、連通位置(43a)と排油位置(43b)の2位置に切換
可能な開閉弁(43)が設けられており、通常この開閉弁
(43)は排油位置(43b)となっている。An auxiliary opening / closing valve (43) that can be switched between a communication position (43a) and an oil discharge position (43b) is provided in the auxiliary descending oil passage (40) from the auxiliary control valve (38). Normally, the open / close valve (43) is at the oil drain position (43b).
以上の構造により、操作レバー(41)を上昇位置(U)
に操作すると主副制御弁(17),(38)が上昇位置(17
U),(38U)に操作される。これにより、第1及び第2
ポンプ(9),(10)からの作動油が主制御弁(17)お
よび副制御弁(38)を通り、上昇側油路(36)及び副上
昇側油路(37)を介して油圧シリンダ(16)の上昇側油
路(16a)に供給されて、ブーム(4)が高速で上昇操
作される。With the above structure, raise the operating lever (41) to the raised position (U).
When operated to, the main and sub control valves (17) and (38) move to the raised position (17
U), (38U). As a result, the first and second
Hydraulic oil from the pumps (9), (10) passes through the main control valve (17) and the sub control valve (38), and passes through the ascending side oil passage (36) and the sub ascending side oil passage (37) to the hydraulic cylinder. It is supplied to the ascending side oil passage (16a) of (16), and the boom (4) is operated to ascend at a high speed.
そして、操作レバー(41)を下降位置(D)に操作する
と主副制御弁(17),(38)が下降位置(17D),(38
D)に操作されるが、副制御弁(38)からの作動油は開
閉弁(43)から排油される為に、油圧シリンダ(16)の
下降側油室(16b)へは主制御弁(17)からの作動油し
か供給されない。さらに、油圧シリンダ(16)の上昇側
油室(16b)からの作動油は、主副制御弁(17),(3
8)の下降位置(17D),(38D)の絞り部(17b),(38
b)を介して排油されて行く。これにより、ブーム
(4)が低速で下降して行く。Then, when the operation lever (41) is operated to the lowered position (D), the main and sub control valves (17) and (38) are lowered to the lowered positions (17D) and (38).
However, the hydraulic oil from the sub control valve (38) is discharged from the on-off valve (43), so the main control valve to the lower oil chamber (16b) of the hydraulic cylinder (16). Only hydraulic oil from (17) is supplied. Further, the hydraulic oil from the ascending side oil chamber (16b) of the hydraulic cylinder (16) is transferred to the main and sub control valves (17), (3
8) Lower position (17D), (38D) diaphragm (17b), (38D)
The oil is drained through b). This causes the boom (4) to descend at a low speed.
そして、第1図に示すように、開閉弁(43)は操作ペダ
ル(44)と機械的に連動連結されており、この操作ペダ
ル(44)を踏み操作すると開閉弁(43)が連通位置(43
a)に切換操作される。この状態で操作レバー(41)を
下降位置(D)に操作すると、第1及び第2ポンプ
(9),(10)からの作動油が主制御弁(17)及び副制
御弁(38)を介して、油圧シリンダ(16)の下降側油室
(16b)に供給される。これにより、ブーム(4)が高
速で下降して行くのである。As shown in FIG. 1, the on-off valve (43) is mechanically linked to the operation pedal (44), and when the operation pedal (44) is depressed, the on-off valve (43) is in the communicating position ( 43
The operation is switched to a). When the operation lever (41) is operated to the lowered position (D) in this state, the hydraulic oil from the first and second pumps (9) and (10) operates the main control valve (17) and the sub control valve (38). It is supplied to the descending side oil chamber (16b) of the hydraulic cylinder (16). This causes the boom (4) to descend at high speed.
前述の実施例では操作ペダル(44)により開閉弁(43)
を操作したが、第3図に示すように開閉弁(43)を電磁
操作式とし、主副制御弁(17),(38)操作用の操作レ
バー(41)にスイッチ(45)を設けて、このスイッチ
(45)を押し操作すると開閉弁(43)が連通位置(43
a)に切換操作されるように構成してもよい。In the above embodiment, the opening / closing valve (43) is operated by the operation pedal (44).
As shown in Fig. 3, the on-off valve (43) is electromagnetically operated, and a switch (45) is provided on the operation lever (41) for operating the main and sub control valves (17) and (38). , When this switch (45) is pressed and operated, the on-off valve (43) moves to the communicating position (43
It may be configured to be switched to a).
又、第4図に示すように構成してもよい。つまり、副制
御弁(38)のスプール(38a)の先端に円筒部材(46)
を外嵌すると共に、スプール(38a)を円筒部材(46)
内に引き込む側に付勢するスプリング(48)を内嵌す
る。そして、スプール(38a)を円筒部材(46)から出
て行く方向に押し操作するソレノイド(52)(切換機構
に相当)を円筒部材(46)に固定している。さらに、円
筒部材(46)に固定されたロッド(49)と主制御弁(1
7)のスプール(17a)とに亘って天秤アーム(50)を架
設すると共に、操作レバー(41)と天秤アーム(50)の
中間部をリンク機構(51)を介して連動連結した構造で
ある。ただし、この構造においては第1図及び第3図に
示す開閉弁(43)は設けない。Further, it may be configured as shown in FIG. That is, the cylindrical member (46) is attached to the tip of the spool (38a) of the sub control valve (38).
And the spool (38a) to the cylindrical member (46).
A spring (48) that biases the side to be pulled in is fitted inside. Then, a solenoid (52) (corresponding to a switching mechanism) for pushing the spool (38a) in a direction to go out of the cylindrical member (46) is fixed to the cylindrical member (46). Further, the rod (49) fixed to the cylindrical member (46) and the main control valve (1
The balance arm (50) is installed over the spool (17a) of 7), and the operation lever (41) and the intermediate portion of the balance arm (50) are interlockingly connected via a link mechanism (51). . However, the on-off valve (43) shown in FIGS. 1 and 3 is not provided in this structure.
以上の構造によって、操作レバー(41)を下降位置
(D)に操作すると、リンク機構(51)の押し作用によ
り天秤アーム(50)が両スプール(17a),(38a)を下
降位置(D)に押し込もうとするが、固定ピン(53)に
天秤アーム(50)の副制御弁(38)側が接当して、天秤
アーム(50)がロッド(49)との連結点周りに紙面上方
に揺動して主制御弁(17)のスプール(17a)のみが下
降位置(D)に操作される。これにより、第1ポンプ
(9)からの作動油のみが油圧シリンダ(16)の下降側
油室(16b)に供給されて、ブーム(4)が低速で下降
していく。With the above structure, when the operation lever (41) is operated to the lowered position (D), the balance arm (50) pushes the spools (17a) and (38a) to the lowered position (D) by the pushing action of the link mechanism (51). , But the auxiliary pin (53) of the balance arm (50) abuts the fixing pin (53), and the balance arm (50) rises above the paper around the connection point with the rod (49). Only the spool (17a) of the main control valve (17) is swung to the down position (D). As a result, only the hydraulic oil from the first pump (9) is supplied to the descending side oil chamber (16b) of the hydraulic cylinder (16), and the boom (4) descends at a low speed.
そして、前記状態において操作レバー(41)のスイッチ
(54)を押し操作すると、ソレノイド(52)がスプリン
グ(48)の付勢力に抗して、副制御弁(38)のスプール
(38a)を下降位置(D)に押し込む。これにより、第
1及び第2ポンプ(9),(10)の両方からの作動油が
油圧シリンダ(16)の下降側油室(16b)に供給され
て、ブーム(4)が高速で下降して行く。又、この高速
下降中にスイッチ(54)を戻し操作すると、スプリング
(48)の付勢力で副制御弁(38)のスプール(38a)が
中立位置(N)に戻り、ブーム(4)が低速下降状態に
戻るのである。When the switch (54) of the operation lever (41) is pushed in the above state, the solenoid (52) moves down the spool (38a) of the sub control valve (38) against the biasing force of the spring (48). Push in position (D). As a result, hydraulic oil from both the first and second pumps (9) and (10) is supplied to the descending side oil chamber (16b) of the hydraulic cylinder (16), and the boom (4) descends at high speed. Go. Also, if the switch (54) is returned during this high speed descent, the spool (38a) of the sub control valve (38) returns to the neutral position (N) by the biasing force of the spring (48), and the boom (4) moves at a low speed. It returns to the descending state.
そして、操作レバー(41)を上昇位置(U)に操作する
と、リンク機構(51)の引き作用によって主副制御弁
(17),(38)の両スプール(17a),(38a)が上昇位
置(U)に操作される。これにより、第1図及び第2ポ
ンプ(17),(38)の両方からの作動油が油圧シリンダ
(16)の上昇側油室(16a)に供給されて、ブーム
(4)が高速で上昇操作されるのである。When the operating lever (41) is moved to the raised position (U), the pulling action of the link mechanism (51) causes the spools (17a) and (38a) of the main and sub control valves (17) and (38) to move to the raised position. Operated by (U). As a result, hydraulic oil from both the pumps (17) and (38) of FIG. 1 is supplied to the ascending side oil chamber (16a) of the hydraulic cylinder (16), and the boom (4) ascends at high speed. It is operated.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.
図面は本発明に係るバックホウ装置の油圧回路構造の実
施例を示し、第1図はバックホウにおける各部の油圧回
路図、第2図はバックホウの全体側面図、第3図は第1
別実施例における油圧シリンダと主副制御弁の油圧回路
図、第4図は第2別実施例における油圧シリンダと主副
制御弁の連係構造を示す図、第5図は従来構造における
主副制御弁と操作レバーとの連係構造を示す図、第6図
は第5図におけるピン付近の縦断正面図である。 (4)……ブーム、(9)……第1ポンプ、(10)……
第2ポンプ、(16)……油圧シリンダ、(16a)……油
圧シリンダの上昇側油室、(16b)……油圧シリンダの
下降側油室、(17)……主制御弁、(17U)……主制御
弁の上昇位置、(17N)……主制御弁の中立位置、(17
D)……主制御弁の下降位置、(36)……上昇側油路、
(38)……副制御弁、(38U)……副制御弁の上昇位
置、(38N)……副制御弁の中立位置、(38D)……副制
御弁の下降位置、(39)……下降側油路、(40)……副
下降側油路、(41)……人為操作具、(43)……開閉
弁、(52)……切換機構。The drawings show an embodiment of the hydraulic circuit structure of the backhoe according to the present invention. Fig. 1 is a hydraulic circuit diagram of each part of the backhoe, Fig. 2 is an overall side view of the backhoe, and Fig. 3 is a first diagram.
FIG. 4 is a hydraulic circuit diagram of a hydraulic cylinder and a main / sub control valve in another embodiment, FIG. 4 is a view showing a linkage structure of a hydraulic cylinder and a main / sub control valve in a second another embodiment, and FIG. 5 is a main / sub control in a conventional structure. FIG. 6 is a view showing a structure in which the valve and the operating lever are linked, and FIG. 6 is a vertical sectional front view of the vicinity of the pin in FIG. (4) …… Boom, (9) …… First pump, (10) ……
2nd pump, (16) ... hydraulic cylinder, (16a) ... oil chamber on the rising side of hydraulic cylinder, (16b) ... oil chamber on the falling side of hydraulic cylinder, (17) ... main control valve, (17U) ...... Main control valve raised position, (17N) …… Main control valve neutral position, (17N)
D) …… Main control valve down position, (36) …… Upward side oil passage,
(38) …… Sub control valve, (38U) …… Up position of sub control valve, (38N) …… Neutral position of sub control valve, (38D) …… Down position of sub control valve, (39) …… Downward-side oil passage, (40) ...... Sub-downward-side oil passage, (41) ...... Manual operation tool, (43) ...... Open / close valve, (52) ...... Switching mechanism.
Claims (2)
リンダ(16)と第1ポンプ(9)とを、前記油圧シリン
ダ(16)の上昇側油室(16a)に作動油を供給する上昇
位置(17U)、中立位置(17N)、前記油圧シリンダ(1
6)の下降側油室(16b)に作動油を供給する下降位置
(17D)の3位置に切換可能な主制御弁(17)を介して
接続し、前記第1ポンプ(9)から上昇側油室(16a)
への上昇側油路(36)及び下降側油室(16b)への下降
側油路(39)と第2ポンプ(10)とを、前記上昇側油路
(36)に作動油を供給する上昇位置(38U)、中立位置
(38N)、下降側油路(39)に作動油を供給する下降位
置(38D)の3位置に切換可能な副制御弁(38)を介し
て接続し、前記主制御弁(17)及び副制御弁(38)を同
方向に操作可能な人為操作具(41)を備えると共に、副
制御弁(38)から下降側油路(39)への副下降側油路
(40)に、人為操作可能な開閉弁(43)を備えてあるバ
ックホウ装置の油圧回路構造。A double-acting hydraulic cylinder (16) for vertically driving a boom (4) and a first pump (9) are provided with hydraulic oil in an ascending side oil chamber (16a) of the hydraulic cylinder (16). Supply up position (17U), neutral position (17N), the hydraulic cylinder (1
6) The lower side oil chamber (16b) is connected to the lower position (17D) for supplying hydraulic oil through the switchable main control valve (17), and the first pump (9) is connected to the upper side. Oil chamber (16a)
To the ascending oil passage (36), the descending oil passage (39) to the descending oil chamber (16b), and the second pump (10), and supplying hydraulic oil to the ascending oil passage (36). Connected via a sub-control valve (38) that can be switched to three positions, a rising position (38U), a neutral position (38N), and a descending position (38D) for supplying hydraulic oil to the descending side oil passage (39), The main control valve (17) and the sub control valve (38) are provided with an artificial operation tool (41) that can be operated in the same direction, and the sub-lowering side oil from the sub-control valve (38) to the lowering side oil passage (39). A hydraulic circuit structure of a backhoe device, in which an on-off valve (43) that can be manually operated is provided in a road (40).
リンダ(16)と第1ポンプ(9)とを、前記油圧シリン
ダ(16)の上昇側油室(16a)に作動油を供給する上昇
位置(17U)、中立位置(17N)、前記油圧シリンダ(1
6)の下降側油室(16b)に作動油を供給する下降位置
(17D)の3位置に切換可能な主制御弁(17)を介して
接続し、前記第1ポンプ(9)から上昇側油室(16a)
への上昇側油路(36)及び下降側油室(16b)への下降
側油路(39)と第2ポンプ(10)とを、前記上昇側油路
(36)に作動油を供給する上昇位置(38U)、中立位置
(38N)、下降側油路(39)に作動油を供給する下降位
置(38D)の3位置に切換可能な副制御弁(38)を介し
て接続すると共に、主制御弁(17)と副制御弁(38)の
両方を下降位置(17D),(38D)に操作可能な状態と主
制御弁(17)のみを下降位置(17D)に操作可能な状態
とに切換え可能な切換機構(52)、並びに、主制御弁
(17)及び副制御弁(38)の両方を上昇位置(17U),
(38U)に操作可能な連係機構を介して、人為操作具(4
1)と主制御弁(17)及び副制御弁(38)を連動連結し
てあるバックホウ装置の油圧回路構造。2. A double-acting hydraulic cylinder (16) for vertically driving the boom (4) and a first pump (9), and hydraulic oil is supplied to an ascending side oil chamber (16a) of the hydraulic cylinder (16). Supply up position (17U), neutral position (17N), the hydraulic cylinder (1
6) The lower side oil chamber (16b) is connected to the lower position (17D) for supplying hydraulic oil through the switchable main control valve (17), and the first pump (9) is connected to the upper side. Oil chamber (16a)
To the ascending oil passage (36), the descending oil passage (39) to the descending oil chamber (16b), and the second pump (10), and supplying hydraulic oil to the ascending oil passage (36). It is connected via a sub control valve (38) that can be switched to three positions: a rising position (38U), a neutral position (38N), and a descending position (38D) that supplies hydraulic oil to the descending side oil passage (39). Both the main control valve (17) and the sub control valve (38) can be operated to the lowered positions (17D) and (38D), and only the main control valve (17) can be operated to the lowered position (17D). A switching mechanism (52) capable of switching to, and both the main control valve (17) and the sub control valve (38) in the raised position (17U),
(38U) through a linkage mechanism that can be operated,
The hydraulic circuit structure of the backhoe device, in which 1), the main control valve (17) and the sub control valve (38) are linked together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238573A JPH07119472B2 (en) | 1989-09-14 | 1989-09-14 | Hydraulic circuit structure of backhoe device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238573A JPH07119472B2 (en) | 1989-09-14 | 1989-09-14 | Hydraulic circuit structure of backhoe device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03103539A JPH03103539A (en) | 1991-04-30 |
| JPH07119472B2 true JPH07119472B2 (en) | 1995-12-20 |
Family
ID=17032228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1238573A Expired - Lifetime JPH07119472B2 (en) | 1989-09-14 | 1989-09-14 | Hydraulic circuit structure of backhoe device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07119472B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2765688B2 (en) * | 1992-05-13 | 1998-06-18 | 株式会社クボタ | Backhoe hydraulic circuit structure |
| KR101088753B1 (en) * | 2008-07-02 | 2011-12-01 | 볼보 컨스트럭션 이큅먼트 에이비 | Hydraulic Drive System for Excavators |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5696175U (en) * | 1979-12-21 | 1981-07-30 |
-
1989
- 1989-09-14 JP JP1238573A patent/JPH07119472B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03103539A (en) | 1991-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4213473B2 (en) | Fluid pressure circuit | |
| EP2103747B1 (en) | Hydraulic drive device for hydraulic excavator | |
| JP3846775B2 (en) | Hydraulic control circuit of boom cylinder in work machine | |
| US3990583A (en) | Device for controlling the boom elevation of a side crane | |
| EP0034900A1 (en) | Civil engineering and construction machinery with hydraulic drive system | |
| CN115748855A (en) | Excavator movable arm floating hydraulic control system and control method | |
| JP3846776B2 (en) | Hydraulic control circuit of boom cylinder in work machine | |
| JP2514915B2 (en) | Floor circuit for construction machine boom | |
| US6877773B1 (en) | Pilot hydraulic control for a pair of stabilizer legs on a backhoe loader machine | |
| JPH07122275B2 (en) | Boom cylinder control circuit | |
| JPH0685449U (en) | Exhaust plate control device | |
| JPH07119472B2 (en) | Hydraulic circuit structure of backhoe device | |
| JPH09287176A (en) | Floating device of hydraulic cylinder | |
| JP3244257B2 (en) | Work machine control circuit of work machine | |
| JPS61294031A (en) | Oil-pressure circuit for excavator | |
| JP2002317471A (en) | Oil pressure control circuit for hydraulic shovel | |
| JP3115205B2 (en) | Hydraulic oil supply circuit to boom hydraulic cylinder in construction machinery | |
| JPH0860710A (en) | Hydraulic circuit of hydraulic construction equipment | |
| JP2002038534A (en) | Operation change-over control circuit for a plurality of actuators retrofitted in multi-functional excavator | |
| JPH11158942A (en) | Alarm device of working machine | |
| JP4367728B2 (en) | Boom cylinder control device for construction machinery | |
| JPH0730769Y2 (en) | Work machine | |
| JP2513411Y2 (en) | Hydraulic circuit for front loader to be mounted on agricultural tractor | |
| JPH0747602Y2 (en) | Directional switching valve drive hydraulic circuit | |
| JPS5940564Y2 (en) | Agricultural front loader |