JPH051432A - Hydraulic circuit construction for backhoe - Google Patents
Hydraulic circuit construction for backhoeInfo
- Publication number
- JPH051432A JPH051432A JP15125891A JP15125891A JPH051432A JP H051432 A JPH051432 A JP H051432A JP 15125891 A JP15125891 A JP 15125891A JP 15125891 A JP15125891 A JP 15125891A JP H051432 A JPH051432 A JP H051432A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- pressure oil
- rotary joint
- swivel base
- 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.)
- Granted
Links
Landscapes
- Component Parts Of Construction Machinery (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、左右一対のクローラ走
行装置及び昇降用油圧シリンダの駆動により昇降自在な
ドーザ装置を備えた走行機台に全旋回自在に旋回台を搭
載するとともに、この旋回台にバックホー装置を連結
し、前記旋回台側に備えた油圧ポンプからの圧油を、各
油圧制御弁並びに旋回中心に配備したロータリージョイ
ントを介して、前記ドーザシリンダ、左右走行駆動用油
圧モータに圧油を供給するよう構成してあるバックホー
の油圧回路構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a swivel base on a traveling machine platform which is provided with a pair of left and right crawler traveling devices and a dozer device which can be raised and lowered by driving a hydraulic cylinder for raising and lowering the swivel platform. A backhoe device is connected to the base, and pressure oil from a hydraulic pump provided on the swivel base side is supplied to the dozer cylinder and the left and right traveling drive hydraulic motors via respective hydraulic control valves and a rotary joint provided at the center of the swivel. The present invention relates to a hydraulic circuit structure for a backhoe configured to supply pressure oil.
【０００２】[0002]
【従来の技術】上記バックホーの油圧回路構造におい
て、従来では、例えば実開平２−１８５５３号公報に示
されるように、前記ロータリージョイントは、単に、旋
回台側の制御弁と走行機台側の各油圧駆動装置との間の
油路を、縦軸芯周りでの相対回動を許容しながら接続す
る油路を形成するだけのもので構成されていた。従っ
て、例えば、左右走行用油圧モータに対して夫々一対の
油圧ポンプからの圧油を各別に供給する状態と、一対の
油圧ポンプからの圧油を合流して左右油圧モータに直列
に供給する直進高速走行状態とに切り換え自在な操作切
換弁、あるいは、ドーザシリンダに対する圧油路を、左
右クローラ走行装置の左右間隔を作業状況に応じて大小
２段階に変更させるクローラ幅伸縮用油圧シリンダに切
り換え供給させる操作切換弁等を設ける場合には、旋回
台側の他の場所に配置するようにしていた。2. Description of the Related Art In the hydraulic circuit structure of the backhoe described above, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 2-18553, the rotary joint simply includes a control valve on the swivel base side and a control valve on the traveling platform side. The oil passage between the hydraulic drive unit and the hydraulic drive unit is configured to simply form an oil passage that is connected while allowing relative rotation about the longitudinal axis. Therefore, for example, a state in which pressure oil from the pair of hydraulic pumps is separately supplied to the left and right traveling hydraulic motors, and a straight line in which the pressure oils from the pair of hydraulic pumps are combined and are supplied to the left and right hydraulic motors in series The operation switching valve that can be switched to the high-speed traveling state or the pressure oil passage for the dozer cylinder is switched and supplied to the hydraulic cylinder for crawler width expansion and contraction that changes the left and right spacing of the left and right crawler traveling devices in two stages, large and small, depending on the work situation. When providing an operation switching valve or the like, it is arranged at another place on the swivel base side.
【０００３】[0003]
【発明が解決しようとする課題】しかし、最近ではバッ
クホーの小型化が促進され、旋回台側に上記したような
切換操作弁を設けると、その切換操作弁自体の配置スペ
ースのみならず、それを操作するための操作連係機構の
ためのスペースが必要となって、旋回台の小型化に制約
を受け、スペースの有効利用が図れない弊害が生じてい
た。本発明は、合理的配置構造を採用することで、上記
不具合点を解消することを目的としている。Recently, however, the downsizing of the backhoe has been promoted, and when the above-mentioned switching operation valve is provided on the swivel side, not only the space for disposing the switching operation valve itself but A space is required for the operation linking mechanism for the operation, and the swivel base is limited in size, which causes a problem that the space cannot be effectively used. An object of the present invention is to eliminate the above-mentioned problems by adopting a rational arrangement structure.
【０００４】[0004]
【課題を解決するための手段】第１発明の特徴構成は、
冒頭に記載したバックホーの油圧回路構造において、前
記左右走行駆動用油圧モータに対する圧油供給路に、一
対の油圧ポンプからの圧油を各別に左右油圧モータに供
給する低速状態と、両油圧ポンプの圧油を合流して、直
列に両油圧モータに供給する高速状態とに切り換え自在
な速度切換弁を介装し、この速度切換弁を、前記ロータ
リージョイントの外周部に取付けるとともに、前記ロー
タリージョイントの軸芯方向に沿う縦方向操作の操作ス
プールを設けて構成してある点にある。第２発明の特徴
構成は、前記ドーザシリンダに対する圧油供給路に、圧
油をドーザシリンダに供給する状態と、左右クローラ走
行装置の機体幅方向の間隔を変更する伸縮用油圧シリン
ダに供給する状態とに切り換え自在な操作対象切換弁を
介装し、この操作対象切換弁を、前記ロータリージョイ
ントの外周部に取付けるとともに、前記ロータリージョ
イントの軸芯方向に沿う縦方向操作の操作スプールを設
けて構成してある点にある。第３発明の特徴構成は、前
記左右走行駆動用油圧モータに対する圧油供給路に、一
対の油圧ポンプからの圧油を各別に左右油圧モータに供
給する低速状態と、両油圧ポンプの圧油を合流して、直
列に両油圧モータに供給する高速状態とに切り換え自在
な速度切換弁を介装するとともに、前記ドーザシリンダ
に対する圧油供給路に、圧油をドーザシリンダに供給す
る状態と、左右クローラ走行装置の機体幅方向の間隔を
変更する伸縮用油圧シリンダに供給する状態とに切り換
え自在な操作対象切換弁を介装し、この操作対象切換弁
と前記速度切換弁とを、前記ロータリージョイントの外
周部に取付けるとともに、前記ロータリージョイントの
軸芯方向に沿う縦方向操作の操作スプールを設けて構成
してある点にある。The features of the first invention are as follows:
In the hydraulic circuit structure of the backhoe described at the beginning, a low-speed state in which pressure oil from a pair of hydraulic pumps is separately supplied to the left and right hydraulic motors in the pressure oil supply path for the left and right traveling drive hydraulic motors, and the hydraulic pumps of both hydraulic pumps. A speed switching valve that can switch between a high speed state in which pressure oil is merged and is supplied to both hydraulic motors in series is interposed, and this speed switching valve is attached to the outer peripheral portion of the rotary joint, and The point is that an operation spool for longitudinal operation along the axial direction is provided. The characteristic configuration of the second invention is that the pressure oil is supplied to the dozer cylinder through the pressure oil supply passage for the dozer cylinder, and is supplied to the expansion / contraction hydraulic cylinder that changes the space between the left and right crawler traveling devices in the machine width direction. And an operation target switching valve which is switchable to and from which the operation target switching valve is attached to the outer peripheral portion of the rotary joint, and an operation spool for longitudinal operation along the axial direction of the rotary joint is provided. There is a point. A characteristic configuration of the third invention is that a low speed state in which pressure oil from a pair of hydraulic pumps is separately supplied to the left and right hydraulic motors and a pressure oil of both hydraulic pumps are provided in a pressure oil supply path for the left and right traveling drive hydraulic motors. A speed switching valve that can be switched to a high-speed state in which the hydraulic motors are merged and supplied to both hydraulic motors in series is installed, and a state in which pressure oil is supplied to the dozer cylinder is provided in a pressure oil supply path for the dozer cylinder. An operation target switching valve that can be switched between a state in which it is supplied to a hydraulic cylinder for expansion and contraction that changes the interval of the crawler traveling device in the machine width direction is interposed, and the operation target switching valve and the speed switching valve are connected to the rotary joint. Is attached to the outer peripheral portion of the rotary joint and is provided with an operation spool for vertical operation along the axial direction of the rotary joint.
【０００５】[0005]
【作用】前記速度切換弁又は前記操作対象切換弁のいず
れか一方、あるいは、両切換弁の双方を、ロータリージ
ョイントの軸芯方向に沿う縦方向操作の操作スプールを
備えた状態で、ロータリージョイントの外周部に取付け
るので、これらの各切換弁とロータリージョイントとを
直接、接続することができ、配管が不要になるととも
に、旋回台側に余分な切換弁やその操作連係機構等を設
ける必要がない。又、ロータリージョイントの外周部
に、切換弁の外形寸法が大きくなる操作スプールの操作
方向とロータリージョイントの軸芯方向とを合わせて取
付ける構造であるから、その回転中心部の上部側に設け
る場合に比較して、上方側への突出を抑制して、旋回台
側の他の部材の配置に制約を与えるおそれが少ない。With either one of the speed switching valve and the operation target switching valve, or both of the switching valves provided with the operation spool for longitudinal operation along the axial direction of the rotary joint, Since it is mounted on the outer periphery, each of these switching valves can be directly connected to the rotary joint, piping is unnecessary, and there is no need to provide an extra switching valve or its operation linkage mechanism on the swivel side. . In addition, since the structure is such that the operation direction of the operation spool, which increases the outer dimensions of the switching valve, and the axial center direction of the rotary joint are attached to the outer periphery of the rotary joint, it is possible to install it on the upper side of the rotation center. In comparison, it is less likely that the protrusion to the upper side will be suppressed and the arrangement of other members on the swivel base side will be restricted.
【０００６】[0006]
【発明の効果】従って、合理的な配置構造によって、切
換弁をコンパクトに配置収納することができ、旋回台側
の小型化にも有効に寄与できるものとなった。しかも、
余計な配管が不要で圧力損失が少なく、油圧回路の構造
の簡素化を図ることができる利点もある。Therefore, the switching valve can be compactly arranged and housed by the rational arrangement structure, which can effectively contribute to the downsizing of the swivel side. Moreover,
There is also the advantage that unnecessary piping is unnecessary, pressure loss is small, and the structure of the hydraulic circuit can be simplified.
【０００７】[0007]
【実施例】以下、実施例を図面に基いて説明する。図５
にバックホーを示している。このバックホーは、左右一
対のクローラ走行装置１，１を備えた走行機台２の上部
に、縦軸芯Ｙ周りで全旋回自在に旋回台３を搭載し、こ
の旋回台３上に原動部４、操縦部５を配設するととも
に、スイングブラケット６を介してバックホー装置７を
連結してある。走行機台２の機体前部側には、ドーザシ
リンダ８により昇降自在にドーザ装置９を取付けるとと
もに、左右クローラ走行装置１，１の間に配備したクロ
ーラ伸縮用シリンダ１０により、左右クローラ走行装置
１，１の横幅間隔を大小２段階に切換え可能に構成して
ある。つまり、図４に示すように、各クローラ走行装置
１，１のトラックフレーム１１，１１を連結する横フレ
ーム１２を走行機台２に対して所定範囲で横スライド自
在に設けるとともに、内外端部で移動規制されるように
して、前記シリンダ１０を伸縮することで幅広状態と幅
狭状態とに切り換えられるよう構成してある。Embodiments will be described below with reference to the drawings. Figure 5
Shows the backhoe. In this backhoe, a swivel base 3 is mounted on an upper part of a traveling machine base 2 having a pair of left and right crawler traveling devices 1 and 1 so that the swivel base 3 can be freely swiveled around a vertical axis Y, and a driving unit 4 is mounted on the swivel base 3. The control unit 5 is provided, and the backhoe device 7 is connected via the swing bracket 6. A dozer device 8 is mounted on the front side of the machine body of the traveling machine base 2 so as to be able to move up and down, and a crawler expansion and contraction cylinder 10 provided between the left and right crawler traveling devices 1 and 1 allows the left and right crawler traveling devices 1 to be mounted. , 1 can be switched in two steps of large and small. That is, as shown in FIG. 4, a horizontal frame 12 for connecting the track frames 11, 11 of each crawler traveling device 1, 1 is provided slidably laterally with respect to the traveling machine base 2 within a predetermined range, and at the inner and outer ends thereof. As the movement is restricted, the cylinder 10 is expanded and contracted to switch between the wide state and the narrow state.
【０００８】旋回台３と走行機台２との間における旋回
中心位置には、これらの相対回動を許容しながら、旋回
台３側の原動部４のエンジン１３により駆動される油圧
ポンプＰ１，Ｐ２からの圧油を操縦部５に配設した各制
御弁Ｖ１，Ｖ２，Ｖ３を介して、左右の走行油圧モータ
Ｍ１，Ｍ２、ドーザシリンダ８及びクローラ伸縮用シリ
ンダ１０に供給するためのロータリージョイント１４を
配設してある。図１に示すように、第１油圧ポンプＰ１
からの圧油をロータリージョイント１４を介して一方の
油圧モータＭ１に供給するよう構成するとともに、第２
油圧ポンプＰ２からの圧油をロータリージョイント１４
を介して他方の油圧モータＭ２に供給するよう構成し、
第１油圧ポンプＰ１からの圧油をロータリージョイント
１４を介してドーザシリンダ９又は伸縮用シリンダ１０
に供給するよう油圧系を構成してある。At the turning center position between the swivel base 3 and the traveling platform 2, the hydraulic pumps P1, driven by the engine 13 of the driving unit 4 on the swivel base 3 side, while permitting relative rotation between them. A rotary joint for supplying the pressure oil from P2 to the left and right traveling hydraulic motors M1, M2, the dozer cylinder 8 and the crawler expansion / contraction cylinder 10 via the respective control valves V1, V2, V3 arranged in the control section 5. 14 are provided. As shown in FIG. 1, the first hydraulic pump P1
Pressure oil from the second hydraulic motor M1 is supplied to the one hydraulic motor M1 via the rotary joint 14, and
The rotary joint 14 applies pressure oil from the hydraulic pump P2.
To supply to the other hydraulic motor M2 via
The pressure oil from the first hydraulic pump P1 is passed through the rotary joint 14 to the dozer cylinder 9 or the expansion / contraction cylinder 10.
The hydraulic system is configured to supply to.
【０００９】そして、左右走行駆動用油圧モータＭ１，
Ｍ２に対する圧油供給路に、一対の油圧ポンプＰ１，Ｐ
２からの圧油を各別に左右油圧モータＭ１，Ｍ２に供給
する低速状態と、両油圧ポンプＰ１，Ｐ２の圧油を合流
して、直列に両油圧モータＭ１，Ｍ２に供給する高速状
態とに切り換え自在な速度切換弁Ｖ４を介装するととも
に、前記ドーザシリンダ９に対する圧油供給路に、圧油
をドーザシリンダ９に供給する状態と、左右クローラ走
行装置１，１の機体幅方向の間隔を変更する前記伸縮用
油圧シリンダ１０に供給する状態とに切り換え自在な操
作対象切換弁Ｖ５を介装し、この操作対象切換弁Ｖ５と
前記速度切換弁Ｖ４とを、前記ロータリージョイント１
４の外周部に取付けるとともに、前記ロータリージョイ
ント１４の軸芯方向に沿う縦方向操作の操作スプール１
５，１６を設けて構成してある。詳述すると、図２、図
３に示すように、ロータリージョイント１４は、走行機
台２側の外筒部材１４ａに旋回台３側の内軸部材１４ｂ
の小径部を縦軸芯Ｙ周りで相対回動自在に内嵌するとと
もに、前記小径部の内部に軸芯方向に沿って形成した各
油路Ｌと外周面に形成した複数のリング状溝Ｒとを夫々
連通させ、外筒部材１４ａの内面に夫々のリング状溝Ｒ
に対応する箇所に油圧取り出し部１７を形成してある。
又、内軸部材１４ｂの上部側大径部の対向する２箇所を
平面状に切欠いて弁取付け座１８，１９を形成し、各弁
取付け座１８，１９に操作対象切換弁Ｖ５と前記速度切
換弁Ｖ４とをネジ固定してある。上記各切換弁Ｖ４，Ｖ
５の上下方向に操作される操作スプール１５，１６は、
リンク機構２０，２１を介して操縦部５に配設した操作
具２２，２３により切り換え操作するよう構成し、各切
換弁Ｖ４，Ｖ５の圧油供給下手側油路は、直接、ロータ
リージョイント１４に形成した油路に接続してある。
又、旋回台３側からの圧油供給路は、総て両切換弁Ｖ
４，Ｖ５に接続してある。又、ドーザシリンダ８又はク
ローラ伸縮用シリンダ１０のいずれかに対する圧油供給
路の一方は、ロータリージョイント１４の下手側で分岐
させて夫々のシリンダ８，１０の片側の油室に接続する
ようにして、油路の簡素化を図っている。このようにす
ると、ドーザシリンダ８駆動時にクローラ伸縮用シリン
ダ１０にも圧油が供給されるが、クローラ伸縮用シリン
ダ１０の駆動負荷はドーザシリンダ８に較べ極めて大き
く、しかも、他方側の油室は閉じられるので、クローラ
走行装置１，１が移動することはない。The left and right traveling hydraulic motors M1,
A pair of hydraulic pumps P1, P are provided in the pressure oil supply passage for M2.
The low speed state in which the pressure oil from 2 is separately supplied to the left and right hydraulic motors M1 and M2, and the high speed state in which the pressure oils from both hydraulic pumps P1 and P2 are merged and supplied to both hydraulic motors M1 and M2 in series are provided. A speed switching valve V4 that can be switched is provided, and a state in which pressure oil is supplied to the dozer cylinder 9 in the pressure oil supply path for the dozer cylinder 9 and a space between the left and right crawler traveling devices 1 and 1 in the machine width direction are set. An operation target switching valve V5, which can be switched to a state in which it is supplied to the hydraulic cylinder 10 for expansion and contraction to be changed, is interposed, and the operation target switching valve V5 and the speed switching valve V4 are connected to the rotary joint 1
4 is mounted on the outer peripheral portion of the rotary joint 14 and is operated longitudinally along the axial direction of the rotary joint 14
5, 16 are provided. More specifically, as shown in FIGS. 2 and 3, the rotary joint 14 includes an outer cylinder member 14a on the traveling machine base 2 side and an inner shaft member 14b on the swivel base 3 side.
Of the small diameter portion is relatively rotatably fitted around the vertical axis Y, and each oil passage L formed along the axial direction inside the small diameter portion and a plurality of ring-shaped grooves R formed on the outer peripheral surface thereof. And the ring-shaped grooves R on the inner surface of the outer tubular member 14a.
The hydraulic pressure take-out portion 17 is formed at a location corresponding to.
Further, two valve-mounting seats 18 and 19 are formed by notching two opposing portions of the large-diameter portion on the upper side of the inner shaft member 14b in a flat shape, and the valve-mounting seats 18 and 19 are provided with the operation target switching valve V5 and the speed switching valve. The valve V4 is fixed with a screw. Each switching valve V4, V
The operation spools 15 and 16 operated in the vertical direction of 5 are
The operation tools 22 and 23 arranged in the control unit 5 are used to perform switching operations via the link mechanisms 20 and 21, and the oil passages on the lower side of the pressure oil supply of the respective switching valves V4 and V5 are directly connected to the rotary joint 14. It is connected to the formed oil passage.
Further, all the pressure oil supply passages from the swivel base 3 side are provided with both switching valves V.
4, connected to V5. Further, one of the pressure oil supply passages for either the dozer cylinder 8 or the crawler expansion / contraction cylinder 10 is branched on the lower side of the rotary joint 14 so as to be connected to the oil chamber on one side of each cylinder 8, 10. , The oil passage is being simplified. With this configuration, the pressure oil is supplied to the crawler expansion / contraction cylinder 10 when the dozer cylinder 8 is driven. Since it is closed, the crawler traveling devices 1, 1 do not move.
【００１０】尚、特許請求の範囲の項に図面との対照を
容易にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.
【図１】油圧回路図[Fig. 1] Hydraulic circuit diagram
【図２】ロータリージョイントの横断平面図FIG. 2 is a cross-sectional plan view of a rotary joint.
【図３】ロータリージョイントの縦断平面図FIG. 3 is a vertical plan view of a rotary joint.
【図４】クローラ走行装置の伸縮機構の平面図FIG. 4 is a plan view of a telescopic mechanism of the crawler traveling device.
【図５】バックホーの全体側面図[FIG. 5] Overall side view of the backhoe
１，１ クローラ走行装置 ２ 走行機台 ３ 旋回台 ７ バックホー装置 ８ ドーザシリンダ ９ ドーザ装置 １０ 伸縮用油圧シリンダ １４ ロータリージョイント １５，１６ 操作スプール Ｍ１，Ｍ２ 走行駆動用油圧モータ Ｐ１，Ｐ２ 油圧ポンプ Ｖ１，Ｖ２，Ｖ３ 油圧制御弁 Ｖ４ 操作対象切換弁 Ｖ５ 速度切換弁 1,1 crawler traveling device 2 traveling platform 3 swivel 7 Backhoe equipment 8 dozer cylinder 9 Dozer device 10 Telescopic hydraulic cylinder 14 Rotary joint 15, 16 operation spool M1, M2 hydraulic motor for traveling drive P1, P2 hydraulic pump V1, V2, V3 hydraulic control valve V4 operation target switching valve V5 speed switching valve
Claims (3)
（１）及び昇降用油圧シリンダ（８）の駆動により昇降
自在なドーザ装置（９）を備えた走行機台（２）に全旋
回自在に旋回台（３）を搭載するとともに、この旋回台
（３）にバックホー装置（７）を連結し、前記旋回台
（３）側に備えた油圧ポンプ（Ｐ１），（Ｐ２）からの
圧油を、各油圧制御弁（Ｖ１），（Ｖ２），（Ｖ３）並
びに旋回中心に配備したロータリージョイント（１４）
を介して、前記ドーザシリンダ（８）、左右走行駆動用
油圧モータ（Ｍ１），（Ｍ２）に圧油を供給するよう構
成してあるバックホーの油圧回路構造であって、前記左
右走行駆動用油圧モータ（Ｍ１），（Ｍ２）に対する圧
油供給路に、一対の油圧ポンプ（Ｐ１），（Ｐ２）から
の圧油を各別に左右油圧モータ（Ｍ１），（Ｍ２）に供
給する低速状態と、両油圧ポンプ（Ｐ１），（Ｐ２）の
圧油を合流して、直列に両油圧モータ（Ｍ１），（Ｍ
２）に供給する高速状態とに切り換え自在な速度切換弁
（Ｖ５）を介装し、この速度切換弁（Ｖ５）を、前記ロ
ータリージョイント（１４）の外周部に取付けるととも
に、前記ロータリージョイント（１４）の軸芯方向に沿
う縦方向操作の操作スプール（１６）を設けて構成して
あるバックホーの油圧回路構造。1. A pair of left and right crawler traveling devices (1),
(1) and a swivel base (2) equipped with a dozer device (9) that can be lifted and lowered by driving the lifting hydraulic cylinder (8), and a swivel base (3) is mounted so that the swivel base (3) can rotate freely. The backhoe device (7) is connected to 3), and the pressure oil from the hydraulic pumps (P1) and (P2) provided on the swivel base (3) side is supplied to the respective hydraulic control valves (V1), (V2), ( V3) and a rotary joint (14) located at the center of turning
A hydraulic circuit structure of a backhoe configured to supply pressure oil to the dozer cylinder (8) and the left and right traveling drive hydraulic motors (M1) and (M2) via the A low speed state in which pressure oil from the pair of hydraulic pumps (P1) and (P2) is separately supplied to the left and right hydraulic motors (M1) and (M2) to the pressure oil supply paths for the motors (M1) and (M2), respectively. The hydraulic oils of both hydraulic pumps (P1) and (P2) are merged, and both hydraulic motors (M1) and (M
2) is provided with a speed switching valve (V5) which can be switched between a high speed state and a high speed state, and the speed switching valve (V5) is attached to the outer peripheral portion of the rotary joint (14) and the rotary joint (14). ) The hydraulic circuit structure of the backhoe, which is configured by providing an operation spool (16) for longitudinal operation along the axial direction.
（１）及び昇降用油圧シリンダ（８）の駆動により昇降
自在なドーザ装置（９）を備えた走行機台（２）に全旋
回自在に旋回台（３）を搭載するとともに、この旋回台
（３）にバックホー装置（７）を連結し、前記旋回台
（３）側に備えた油圧ポンプ（Ｐ１），（Ｐ２）からの
圧油を、各油圧制御弁（Ｖ１），（Ｖ２），（Ｖ３）並
びに旋回中心に配備したロータリージョイント（１４）
を介して、前記ドーザシリンダ（８）、左右走行駆動用
油圧モータ（Ｍ１），（Ｍ２）に圧油を供給するよう構
成してあるバックホーの油圧回路構造であって、前記ド
ーザシリンダ（８）に対する圧油供給路に、圧油をドー
ザシリンダ（８）に供給する状態と、左右クローラ走行
装置（１），（１）の機体幅方向の間隔を変更する伸縮
用油圧シリンダ（１０）に供給する状態とに切り換え自
在な操作対象切換弁（Ｖ４）を介装し、この操作対象切
換弁（Ｖ４）を、前記ロータリージョイント（１４）の
外周部に取付けるとともに、前記ロータリージョイント
（１４）の軸芯方向に沿う縦方向操作の操作スプール
（１５）を設けて構成してあるバックホーの油圧回路構
造。2. A pair of left and right crawler traveling devices (1),
(1) and a swivel base (2) equipped with a dozer device (9) that can be lifted and lowered by driving the lifting hydraulic cylinder (8), and a swivel base (3) is mounted so that the swivel base (3) can rotate freely. The backhoe device (7) is connected to 3), and the pressure oil from the hydraulic pumps (P1) and (P2) provided on the swivel base (3) side is supplied to the respective hydraulic control valves (V1), (V2), ( V3) and a rotary joint (14) located at the center of turning
A hydraulic circuit structure of a backhoe configured to supply pressure oil to the dozer cylinder (8) and the left and right traveling drive hydraulic motors (M1) and (M2) via the dozer cylinder (8). In the state of supplying pressure oil to the dozer cylinder (8) in the pressure oil supply passage for the, and to the hydraulic cylinder for expansion and contraction (10) that changes the space between the left and right crawler traveling devices (1) and (1) in the machine width direction. The operation target switching valve (V4) which can be switched to the state where it is switched is interposed, and the operation target switching valve (V4) is attached to the outer peripheral portion of the rotary joint (14) and the shaft of the rotary joint (14). A backhoe hydraulic circuit structure configured by providing an operation spool (15) for longitudinal operation along the core direction.
（１）及び昇降用油圧シリンダ（８）の駆動により昇降
自在なドーザ装置（９）を備えた走行機台（２）に全旋
回自在に旋回台（３）を搭載するとともに、この旋回台
（３）にバックホー装置（７）を連結し、前記旋回台
（３）側に備えた油圧ポンプ（Ｐ１），（Ｐ２）からの
圧油を、各油圧制御弁（Ｖ１），（Ｖ２），（Ｖ３）並
びに旋回中心に配備したロータリージョイント（１４）
を介して、前記ドーザシリンダ（８）、左右走行駆動用
油圧モータ（Ｍ１），（Ｍ２）に圧油を供給するよう構
成してあるバックホーの油圧回路構造であって、前記左
右走行駆動用油圧モータ（Ｍ１），（Ｍ２）に対する圧
油供給路に、一対の油圧ポンプ（Ｐ１），（Ｐ２）から
の圧油を各別に左右油圧モータ（Ｍ１），（Ｍ２）に供
給する低速状態と、両油圧ポンプ（Ｐ１），（Ｐ２）の
圧油を合流して、直列に両油圧モータ（Ｍ１），（Ｍ
２）に供給する高速状態とに切り換え自在な速度切換弁
（Ｖ５）を介装するとともに、前記ドーザシリンダ
（８）に対する圧油供給路に、圧油をドーザシリンダ
（８）に供給する状態と、左右クローラ走行装置
（１），（１）の機体幅方向の間隔を変更する伸縮用油
圧シリンダ（１０）に供給する状態とに切り換え自在な
操作対象切換弁（Ｖ４）を介装し、この操作対象切換弁
（Ｖ４）と前記速度切換弁（Ｖ５）とを、前記ロータリ
ージョイント（１４）の外周部に取付けるとともに、前
記ロータリージョイント（１４）の軸芯方向に沿う縦方
向操作の操作スプール（１５），（１６）を設けて構成
してあるバックホーの油圧回路構造。3. A pair of left and right crawler traveling devices (1),
(1) and a swivel base (2) equipped with a dozer device (9) that can be lifted and lowered by driving the lifting hydraulic cylinder (8), and a swivel base (3) is mounted so that the swivel base (3) can rotate freely. The backhoe device (7) is connected to 3), and the pressure oil from the hydraulic pumps (P1) and (P2) provided on the swivel base (3) side is supplied to the respective hydraulic control valves (V1), (V2), ( V3) and a rotary joint (14) located at the center of turning
A hydraulic circuit structure of a backhoe configured to supply pressure oil to the dozer cylinder (8) and the left and right traveling drive hydraulic motors (M1) and (M2) via the A low speed state in which pressure oil from the pair of hydraulic pumps (P1) and (P2) is separately supplied to the left and right hydraulic motors (M1) and (M2) to the pressure oil supply paths for the motors (M1) and (M2), respectively. The hydraulic oils of both hydraulic pumps (P1) and (P2) are merged, and both hydraulic motors (M1) and (M
2) A high speed state in which it can be switched to a high speed state is interposed, and a pressure oil is supplied to the dozer cylinder (8) in the pressure oil supply passage for the dozer cylinder (8). , The left and right crawler traveling devices (1) and (1) are supplied to the expansion / contraction hydraulic cylinder (10) for changing the space in the machine width direction. The operation changeover valve (V4) and the speed changeover valve (V5) are attached to the outer peripheral portion of the rotary joint (14), and an operation spool for vertical operation along the axial direction of the rotary joint (14) ( The hydraulic circuit structure of the backhoe configured by providing (15) and (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15125891A JP2672206B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic circuit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15125891A JP2672206B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic circuit structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH051432A true JPH051432A (en) | 1993-01-08 |
| JP2672206B2 JP2672206B2 (en) | 1997-11-05 |
Family
ID=15514734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15125891A Expired - Lifetime JP2672206B2 (en) | 1991-06-24 | 1991-06-24 | Backhoe hydraulic circuit structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2672206B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995023260A1 (en) * | 1994-02-28 | 1995-08-31 | Komatsu Ltd. | Travelling hydraulic device |
-
1991
- 1991-06-24 JP JP15125891A patent/JP2672206B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995023260A1 (en) * | 1994-02-28 | 1995-08-31 | Komatsu Ltd. | Travelling hydraulic device |
| US5701796A (en) * | 1994-02-28 | 1997-12-30 | Komatsu Ltd. | Hydraulic apparatus for traveling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2672206B2 (en) | 1997-11-05 |
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