JPH0674049B2 - Hydraulic circuit structure of work vehicle - Google Patents
Hydraulic circuit structure of work vehicleInfo
- Publication number
- JPH0674049B2 JPH0674049B2 JP61027212A JP2721286A JPH0674049B2 JP H0674049 B2 JPH0674049 B2 JP H0674049B2 JP 61027212 A JP61027212 A JP 61027212A JP 2721286 A JP2721286 A JP 2721286A JP H0674049 B2 JPH0674049 B2 JP H0674049B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- hydraulic
- filter
- circuit structure
- hydraulic circuit
- 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
- Arrangement And Driving Of Transmission Devices (AREA)
- Power Steering Mechanism (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ミツシヨンケースからのミツシヨンオイルを
フイルタを介して、エンジンに装着した作業装置昇降用
の第１油圧ポンプ及びパワーステアリング装置用の第２
油圧ポンプに並列供給するように構成してある作業車の
油圧回路構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a first hydraulic pump and a power steering device for raising and lowering a work device mounted on an engine with a mixture oil from a mixture case through a filter. Second
The present invention relates to a hydraulic circuit structure of a work vehicle configured to supply oil to a hydraulic pump in parallel.
前述のような油圧回路を持つ農用トラクタ等の作業車に
おいては、各油圧装置からの排油は全て油タンクである
ミツシヨンケースに戻すような油圧回路構造となつてい
た。In a work vehicle such as an agricultural tractor having a hydraulic circuit as described above, the hydraulic circuit structure is such that all the drained oil from each hydraulic device is returned to a mesh case which is an oil tank.
農用トラクタ等の作業車においてはパワーステアリング
用、作業装置昇降用、油圧操作式の前輪変速装置用等の
多くの油圧装置を備えているので、油タンクからフイル
タを介して多量の油が油圧ポンプに供給される。又、例
えば、前輪変速装置用の油圧ポンプがミツシヨンケース
内の分岐動力によつて駆動される場合など、主クラツチ
の入切操作に伴つてこの油圧ポンプも入切操作されるの
で、フイルタを通過する油量にも大きな変動が生ずる場
合がある。これによつて、フイルタに早期に目詰まりが
発生したり、フイルタから油路内に空気が吸い込まれた
りする場合があつた。Work vehicles such as agricultural tractors are equipped with many hydraulic devices such as power steering, lifting and lowering of working devices, and hydraulically operated front wheel transmissions.Therefore, a large amount of oil is pumped from the oil tank through a filter to a hydraulic pump. Is supplied to. Also, for example, when the hydraulic pump for the front wheel transmission is driven by the branch power in the transmission case, this hydraulic pump is also turned on and off with the operation of turning on and off the main clutch. There may be large fluctuations in the amount of oil passing through. As a result, the filter may be clogged early or air may be sucked into the oil passage from the filter.
ここで本発明の目的は前述のフイルタを通過する油量及
び油量の変動を抑えてフイルタの早期目詰まり及び空気
の吸い込み等を防止することにある。It is an object of the present invention to suppress the amount of oil passing through the filter and the fluctuation of the amount of oil to prevent early clogging of the filter and intake of air.
本発明の特徴は作業装置昇降用の第１油圧ポンプと、パ
ワーステアリング装置用の第２油圧ポンプとをエンジン
で駆動される状態で備え、ミッションケースからのミッ
ションオイルをフィルタを介して両油圧ポンプに並列供
給する第１供給路を備えてある作業車の油圧回路構造に
おいて、 フィルタ通過後のミッションオイルを変速操作用ポンプ
に供給する第２供給路を設け、さらに、パワーステアリ
ング装置の排油路と第２供給路とを連通接続してある点
にある。A feature of the present invention is that a first hydraulic pump for raising and lowering a working device and a second hydraulic pump for a power steering device are provided in a state of being driven by an engine, and transmission oil from a transmission case is transmitted through a filter to both hydraulic pumps. In a hydraulic circuit structure of a work vehicle that is provided with a first supply path that is supplied in parallel to the engine, a second supply path that supplies the transmission oil that has passed through the filter to the speed change operation pump is provided, and further, an oil discharge path of the power steering device. And the second supply path are connected for communication.
上記特徴構成によると、パワーステアリング装置の排油
が第２供給路を通って第１供給路に戻り可能になり、第
１及び第２油圧ポンプには、フィルタを介したミッショ
ンケースのオイルと、フィルタを通らないパワーステア
リング装置からの戻りオイルとの双方が供給される。According to the above characteristic configuration, the drain oil of the power steering device can be returned to the first supply path through the second supply path, and the first and second hydraulic pumps include the oil of the transmission case via the filter, Both return oil from the power steering device, which does not pass through the filter, is supplied.
従って、従来のように全てフィルタを通すようにする手
段に比べて、フィルタの通過油量を減少させることがで
き、早期目詰まりや油路への空気混入といった不都合を
なくすことが可能になる。Therefore, it is possible to reduce the amount of oil passing through the filter as compared with the conventional means that allows all the filters to pass, and it is possible to eliminate the inconveniences such as early clogging and air mixing in the oil passage.
そして、変速操作用ポンプにもパワーステアリング装置
の戻り油が供給されるから、その変速操作用ポンプを作
動させたときのフィルタ通過油量が抑えられる。Then, since the return oil of the power steering device is also supplied to the gear shift operation pump, the amount of oil passing through the filter when the gear shift operation pump is operated can be suppressed.
又、パワーステアリング装置の排油路と第２供給路とが
部分的に兼用化され、油路を一部省略できるようにもな
る。Further, the drainage passage and the second supply passage of the power steering device are partially shared, and the oil passage can be partially omitted.
つまり、パワーステアリング装置は比較的軽負荷に対す
る油圧装置であり、作業装置昇降等の重負荷用の油圧装
置に比べて作動油の劣化が少なく、排油の再供給が可能
であることを利用したものである。In other words, the power steering system is a hydraulic system for a relatively light load, and the deterioration of hydraulic oil is less than that of a hydraulic system for heavy loads such as lifting and lowering of working equipment, and it is possible to re-supply drained oil. It is a thing.
その結果、パワーステアリング装置での作動油劣化が少
ないことを利用しての油圧回路工夫により、各油圧ポン
プの作動に支障なくフィルタ通過油量を抑制でき、フィ
ルタの目詰まりや空気混入がなく、又油圧回路の簡素化
も図れるといった利点が得られた。As a result, the amount of oil that passes through the filter can be suppressed without hindering the operation of each hydraulic pump by using a hydraulic circuit device that takes advantage of the fact that hydraulic oil deterioration in the power steering device is small, and there is no filter clogging or air inclusion, Moreover, the advantage that the hydraulic circuit can be simplified is obtained.
以下、本発明の実施例である作業車を、その一例である
農用トラクタにより図面に基づいて説明する。Hereinafter, a working vehicle according to an embodiment of the present invention will be described with reference to the drawings using an agricultural tractor as an example thereof.
第２図に示すように、左右一対の操向型の前輪（１），
（１）及び後輪（２），（２）を各々駆動自在に支持し
た左右一対の機体フレーム（３）にエンジン（４）、主
クラツチ（５）、ミツシヨンケース（６）及び操縦部
（７）を搭載し、機体後部にロータリー耕耘装置等の各
種作業装置を昇降自在に連結するための上下に揺動駆動
自在なリフトアーム（８）及び作業装置に動力を伝達す
るPTO軸（９）を設けて四輪駆動型の農用トラクタを構
成している。As shown in FIG. 2, a pair of left and right steering type front wheels (1),
The engine (4), the main clutch (5), the mission case (6), and the control section (on the left and right body frames (3) that movably support the (1) and the rear wheels (2), (2) respectively. 7) is mounted, and a lift arm (8) vertically swingable for connecting various working devices such as a rotary tiller to the rear part of the machine body, and a PTO shaft (9) for transmitting power to the working device. Is provided to form a four-wheel drive agricultural tractor.
次に農用トラクタの動力伝達系統について詳述すると、
図に示すように、エンジン（４）からの動力は主クラツ
チ（５）、動力伝達軸（11）を介してミツシヨンケース
（６）内の主変速装置（図示せず）及び副変速装置（図
示せず）に伝達され、変速操作されて後輪（２），
（２）を駆動すると共に、副変速装置から分岐した動力
はミツシヨンケース（６）に取付けた前輪変速装置（2
0）に送られ変速操作されて、前輪出力軸（15）を介し
て前輪デフ機構（1a）に送られて、前輪（１），（１）
を駆動するように構成している。Next, in detail about the power transmission system of the agricultural tractor,
As shown in the figure, the power from the engine (4) is transmitted through a main clutch (5) and a power transmission shaft (11) to a main transmission device (not shown) and an auxiliary transmission device (not shown) in a transmission case (6). (Not shown), the gear is changed and the rear wheels (2),
The power diverged from the auxiliary transmission while driving (2) is attached to the front wheel transmission (2
To the front wheel output mechanism (1a) via the front wheel output shaft (15), and the front wheels (1), (1) are transmitted.
Is configured to drive.
次に本発明を適用している油圧回路について詳述する
と、第１図に示すように、ミツシヨンケース（６）内の
ミツシヨンオイルを１つのフイルタ（12）を介して作業
装置昇降用の第１油圧ポンプ（13）及び前装装置（21）
であるパワーステアリングユニツト用の第２油圧ポンプ
（14）に並列供給されている。この第１・第２油圧ポン
プ（13），（14）はエンジン（４）に設置されており、
エンジン（４）の分岐動力によつて駆動される。第１油
圧ポンプ（13）からの圧油は切換弁（16）を介して作業
装置を昇降操作する単動型シリンダ（17）に供給され、
第２油圧ポンプ（14）からの圧油は前輪操向用のパワー
ステアリングユニツト（21）に供給される。Next, the hydraulic circuit to which the present invention is applied will be described in detail. As shown in FIG. 1, the mesh oil in the mesh case (6) is passed through one filter (12) to lift the working device. First hydraulic pump (13) and front-mounted device (21)
Is supplied in parallel to the second hydraulic pump (14) for the power steering unit. The first and second hydraulic pumps (13) and (14) are installed in the engine (4),
It is driven by the branch power of the engine (4). The pressure oil from the first hydraulic pump (13) is supplied to the single-acting cylinder (17) that moves up and down the working device via the switching valve (16),
The pressure oil from the second hydraulic pump (14) is supplied to the power steering unit (21) for steering the front wheels.
そして図に示すように、パワーステアリングユニツト
（21）からの排油路（18）を前記第１・第２油圧ポンプ
（13），（14）とフイルタ（12）との間、及び、変速操
作用ポンプ（19）の吸入側に並列接続している。つま
り、ミッションオイルをフィルタ（12）を介して第１及
び第２油圧ポンプ（13），（14）に並列供給する第１供
給路（22）と、フィルタ（12）通過後のミッションオイ
ルを変速操作用ポンプ（19）に供給する第２供給路（2
3）を設け、さらに、パワーステアリング装置（21）の
排油路（18）と第２供給路（23）とを連通接続してあ
る。この変速操作用ポンプ（19）は前輪変速装置（20）
に変速用の圧油を供給するポンプであり、前輪変速装置
（20）はミツシヨンケース（６）内の副変速装置から分
岐した動力を後輪駆動速度に略等しい駆動速度で伝動す
る状態と、後輪駆動速度より大きい駆動速度で伝動する
状態とに変速操作して前輪（１），（１）伝達する油圧
クラツチ式の装置である。Then, as shown in the drawing, an oil discharge passage (18) from the power steering unit (21) is provided between the first and second hydraulic pumps (13) and (14) and the filter (12), and a shift operation is performed. It is connected in parallel to the suction side of the pump (19). That is, the first supply path (22) for supplying the transmission oil in parallel to the first and second hydraulic pumps (13), (14) via the filter (12) and the transmission oil after passing through the filter (12) are changed in speed. The second supply path (2 that supplies the operation pump (19)
3) is provided, and the oil discharge passage (18) of the power steering device (21) and the second supply passage (23) are connected for communication. This gear shifting pump (19) is a front wheel transmission (20).
A front wheel transmission (20) is a pump for supplying pressure oil for shifting to a state in which the power branched from the auxiliary transmission in the transmission case (6) is transmitted at a drive speed substantially equal to the rear wheel drive speed. , A hydraulic clutch type device that shifts to a state in which it is transmitted at a drive speed higher than the rear wheel drive speed and transmits the front wheels (1), (1).
尚、前記前装装置（21）としては、パワーステアリング
ユニツトの他に、フロントローダ装置、フロント３点リ
ンク機構、など種々の装置が対象となる。The front mounting device (21) is not limited to the power steering unit, but may be various devices such as a front loader device and a front three-point link mechanism.
図面は本発明に係る作業車の油圧回路構造の実施例を示
し、第１図は油圧回路図、第２図はトラクタの全体側面
図である。 （４）……エンジン、（６）……ミツシヨンケース、
（12）……フイルタ、（13）……第１油圧ポンプ、（1
4）……第２油圧ポンプ、（18）……排油路、（19）…
…変速操作用ポンプ、（21）……パワーステアリング装
置、（22）……第１供給路、（23）……第２供給路。The drawings show an embodiment of a hydraulic circuit structure of a work vehicle according to the present invention. FIG. 1 is a hydraulic circuit diagram and FIG. 2 is an overall side view of a tractor. (4) …… Engine, (6) …… Mission case,
(12) …… Filter, (13) …… First hydraulic pump, (1
4) …… Second hydraulic pump, (18) …… Oil drainage path, (19)…
... pump for gear shifting operation, (21) ... power steering device, (22) ... first supply path, (23) ... second supply path.
Claims (2)
と、パワーステアリング装置（21）用の第２油圧ポンプ
（14）とをエンジン（４）で駆動される状態で備え、ミ
ッションケース（６）のミッションオイルをフィルタ
（12）を介して前記両油圧ポンプ（13），（14）に並列
供給する第１供給路（22）を備えてある作業車の油圧回
路構造であって、 前記フィルタ（12）通過後のミッションオイルを変速操
作用ポンプ（19）に供給する第２供給路（23）を設け、
さらに、前記パワーステアリング装置（21）の排油路
（18）と前記第２供給路（23）とを連通接続してある作
業車の油圧回路構造。1. A first hydraulic pump (13) for raising and lowering a working device.
And a second hydraulic pump (14) for the power steering device (21) in a state of being driven by the engine (4), and the transmission oil of the transmission case (6) is passed through the filter (12) to both hydraulic pressures. A hydraulic circuit structure for a work vehicle, comprising a first supply path (22) for parallel supply to pumps (13), (14), wherein the transmission oil after passing through said filter (12) is a pump for speed change operation (19). ) Is provided with a second supply path (23),
Furthermore, the hydraulic circuit structure of the work vehicle in which the oil discharge passage (18) of the power steering device (21) and the second supply passage (23) are connected in communication.
変速装置（20）用のものである特許請求の範囲第1.項に
記載の作業車の油圧回路構造。2. The hydraulic circuit structure for a work vehicle according to claim 1, wherein the hydraulic pump (19) for gear shift operation is for a front wheel transmission (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027212A JPH0674049B2 (en) | 1986-02-10 | 1986-02-10 | Hydraulic circuit structure of work vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027212A JPH0674049B2 (en) | 1986-02-10 | 1986-02-10 | Hydraulic circuit structure of work vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62184929A JPS62184929A (en) | 1987-08-13 |
| JPH0674049B2 true JPH0674049B2 (en) | 1994-09-21 |
Family
ID=12214797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61027212A Expired - Lifetime JPH0674049B2 (en) | 1986-02-10 | 1986-02-10 | Hydraulic circuit structure of work vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0674049B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5654661U (en) * | 1979-10-04 | 1981-05-13 | ||
| JPS609519Y2 (en) * | 1980-05-02 | 1985-04-03 | ヤンマーディーゼル株式会社 | Oil filter mounting device for tractors |
| JPS57159406A (en) * | 1981-03-30 | 1982-10-01 | Iseki Agricult Mach | Oil pressure apparatus of combine |
-
1986
- 1986-02-10 JP JP61027212A patent/JPH0674049B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62184929A (en) | 1987-08-13 |
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