JPH0246367A - Shift hydraulic circuit for tractors, etc. - Google Patents
Shift hydraulic circuit for tractors, etc.Info
- Publication number
- JPH0246367A JPH0246367A JP63198608A JP19860888A JPH0246367A JP H0246367 A JPH0246367 A JP H0246367A JP 63198608 A JP63198608 A JP 63198608A JP 19860888 A JP19860888 A JP 19860888A JP H0246367 A JPH0246367 A JP H0246367A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic circuit
- transmission
- valve
- reverse
- clutch
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims description 30
- 230000007935 neutral effect Effects 0.000 description 8
- 239000003921 oil Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
Landscapes
- Gear-Shifting Mechanisms (AREA)
- Structure Of Transmissions (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、トラクタ等の変速油圧回路に関する。[Detailed description of the invention] Industrial applications The present invention relates to a transmission hydraulic circuit for a tractor or the like.
従来の技術、および発明が解決しようとする課廂
前後進切換クラッチ、及び変速クラッチを有するいわゆ
るパワーシフトトランスミッションにおいては、油圧ポ
ンプから圧力制御弁、前後進切換弁等を経て前後進切換
クラッチに至る前後進油圧回路において、該油圧ポンプ
と圧力制御弁との間から、変速切換弁を経て変速切換ク
ラッチへ至る変速油圧回路を単に分岐連通ずる構成とす
る。このため次のような問題点を生ずる。即ち、前後進
クラッチの油圧制御では、潤滑ボート及び圧力制御弁内
の圧損の影響を受は易く、又、前後進クラッチを切換え
ると、変速クラッチ内の油圧も下るため、変速クラッチ
の吸収エネルギーが大きくなる。Conventional technology and the problem to be solved by the invention In a so-called power shift transmission having a forward/reverse switching clutch and a speed change clutch, a hydraulic pump is connected to a forward/reverse switching clutch via a pressure control valve, a forward/reverse switching valve, etc. In the forward/reverse hydraulic circuit, a shift hydraulic circuit is simply branched and communicated from between the hydraulic pump and the pressure control valve to the shift switching clutch via the shift switching valve. This causes the following problems. In other words, the hydraulic control of the forward/reverse clutch is easily affected by the pressure loss in the lubricating boat and the pressure control valve, and when the forward/reverse clutch is switched, the hydraulic pressure in the speed change clutch also decreases, so the energy absorbed by the speed change clutch is reduced. growing.
課題を解決するための手段
この発明は、油圧ポンプ（１）から圧力制御弁（２）、
＠後進切換弁（３）等を経て前後進切換クラッチ（Ｆ）
（Ｒ）へ至る前後進油圧回路（４）の、該油圧ポンプ（
１）と圧力制御弁（２）との間には、変速切換弁（５）
（６）を経て変速切換クラッチ（Ｃ１）（Ｃ２）（Ｃ３
）（Ｃ４）へ至る変速油圧回路（７）を連通し、この変
速油圧回路（７）の連通部（８）と該圧力制御弁（２）
との間には、リリーフバルブ（９）を連通（ｌＯ）して
なるトラクタ等の変速油圧回路の構成とすへ発明の作用
、および効果
油圧ポンプ（１）の駆動によって、前後進油圧回路（４
）及び変速油圧回路（７）へ油圧を供給する０前後進切
換弁（３）、変速切換弁（５）（６）が中立位置にある
ときは、余りの油圧はリリーフバルブ（９）から逃げて
、油圧ポンプ（１）から該前後進油圧回路（４）の圧力
制御弁（２）までの回路や、変速油圧回路（７）の変速
切換弁（５）（６）までの回路の油圧を一定圧に維持し
ている。Means for Solving the Problems This invention provides a hydraulic pump (1) to a pressure control valve (2),
@ Forward/forward switching clutch (F) via reverse switching valve (3), etc.
(R) of the forward/reverse hydraulic circuit (4) leading to the hydraulic pump (
1) and the pressure control valve (2), there is a gear changeover valve (5).
(6) and the gear change clutch (C1) (C2) (C3).
) (C4), and the communication part (8) of this transmission hydraulic circuit (7) and the pressure control valve (2).
The construction of a transmission hydraulic circuit for a tractor, etc., in which the relief valve (9) is communicated (lO) between the 4
) and the transmission hydraulic circuit (7), when the forward/reverse switching valve (3) and the transmission switching valves (5) and (6) are in the neutral position, the excess hydraulic pressure escapes from the relief valve (9). The hydraulic pressure of the circuit from the hydraulic pump (1) to the pressure control valve (2) of the forward/reverse hydraulic circuit (4) and the circuit from the transmission switching valve (5) (6) of the transmission hydraulic circuit (7) is controlled. Maintains constant pressure.
前後進切換弁（３）が中立位置から前進位置又は後進位
置へ切換えられると、同時に圧力制御弁（２）が開かれ
て、前進クラッチ（Ｆ）、又は後進クラッチ（Ｒ）へ油
圧を供給して、前進又は後進伝動を行わせる。When the forward/reverse switching valve (3) is switched from the neutral position to the forward or reverse position, the pressure control valve (2) is simultaneously opened to supply hydraulic pressure to the forward clutch (F) or reverse clutch (R). to perform forward or reverse transmission.
又、変速切換弁（５）（６）が中立位置から第−速〜第
四速へ切換えられると、変速クラッチ（Ｃ１）、（Ｃ２
）、（Ｃ３）、又は（Ｃ４）が油圧作動されて変速伝動
が行われる。このように前後進切換弁（３）、又は変速
切換弁（５）（６）等が切換えられるときは、各油圧回
路（４） （７）の油圧は一旦低下するが、クラッチ
作動が完了すると、再び各油圧回路（４）（７）の油圧
か−・定に上昇して、リリーフバルブ（９）が余りの圧
力を逃す。Further, when the shift changeover valves (5) and (6) are switched from the neutral position to the -4th to fourth speeds, the shift clutches (C1) and (C2
), (C3), or (C4) is hydraulically operated to perform gear transmission. When the forward/reverse switching valve (3) or the speed change switching valve (5), (6), etc. are switched in this way, the oil pressure in each hydraulic circuit (4) (7) decreases once, but once the clutch operation is completed. The oil pressure of each hydraulic circuit (4) and (7) rises to a constant level again, and the relief valve (9) releases the excess pressure.
変速クラッチ（Ｃ１）、（Ｃ２）、（Ｃ３）、又は（Ｃ
４）を切換えるときは、前後進切換クラッチ（Ｆ）及び
（Ｒ）を切りにした後に行い、変速クラッチ（Ｃ１）〜
（Ｃ４）の切換えが完了した後で前後進切換クラッチ（
Ｆ）（Ｒ）を入りにすれば、動力の伝達が遮断されてい
る状態で、変速クラッチ（Ｃ１）〜（Ｃ４）の切換えが
完了できる。このとき、変速クラッチ（ＣＩ）〜（Ｃ４
）の作動油圧は、リリーフバルブ（９）によって設定さ
れているために１前後進クラッチ（Ｆ）（Ｒ）の作動圧
を高める前に、変速クラッチ（Ｃ１）〜（Ｃ４）の油圧
上昇は完了する。従って、変速クラッチ（Ｃ１）〜（Ｃ
４）の入すのときの吸収エネルギーは小さくなり、変速
クラッチの容量を小さくすることが可能となる。Shift clutch (C1), (C2), (C3), or (C
4), do so after disengaging the forward/reverse switching clutches (F) and (R), and then
After switching of (C4) is completed, forward/reverse switching clutch (
If F) (R) is turned on, switching of the speed change clutches (C1) to (C4) can be completed while power transmission is cut off. At this time, the speed change clutch (CI) ~ (C4
) is set by the relief valve (9), so the oil pressure of the transmission clutches (C1) to (C4) is completed before increasing the working pressure of the first forward/reverse clutches (F) and (R). do. Therefore, the speed change clutches (C1) to (C
The energy absorbed when 4) is engaged becomes smaller, making it possible to reduce the capacity of the speed change clutch.
実施例
なお、図例第１図において、油圧ポンプ（１）から分流
弁（１１）、連通部（８）、（１０）等を経て圧力制御
弁（２）を連通し、更に前後進切換弁（３）を経て前後
進切換クラッチ（Ｆ）（Ｒ）に連通ずる前後進油圧回路
（４）を構成し、頚部後進切換弁（３）をＭｌＥｊｉ操
作で作動切換えして、前進切換クラッチ（Ｆ）、又は後
進切換クラッチ（Ｒ）へ油圧を送り、これらクラッチＣ
Ｆ）又は（Ｒ）を中立位置から入りの位置にして、前進
走行伝動、又は後進走行伝動に切換わる。このとき、圧
力制御弁（２）が、制御装置のマイクロコンピュータか
らの制御信号によって、エンジンの回転走行変速位と、
及び走行伝動の負荷等に応じて適切な油圧量を制御し、
前後進切換クラ−、チ（Ｆ）（Ｒ）を円滑に切換える。Embodiment In Fig. 1, the hydraulic pump (1) communicates with the pressure control valve (2) via the flow dividing valve (11), the communication parts (8), (10), etc., and further connects the pressure control valve (2) with the forward/reverse switching valve. A forward/reverse hydraulic circuit (4) is configured which communicates with the forward/reverse switching clutches (F) and (R) via (3), and the neck reverse switching valve (3) is operated by the MlEji operation to operate the forward/reverse switching clutch (F). ), or to the reverse switching clutch (R), and these clutches C
F) or (R) is moved from the neutral position to the on position to switch to forward travel transmission or reverse travel transmission. At this time, the pressure control valve (2) adjusts the rotational speed of the engine according to the control signal from the microcomputer of the control device.
and controls the appropriate amount of hydraulic pressure according to the load of the traveling transmission, etc.
Smoothly switches forward/reverse switching between H (F) and (R).
又、この圧力制御弁（２）は、通常時は閉位置に設定す
るノーマルクローズ形態としている。Further, this pressure control valve (2) is in a normally closed configuration in which the pressure control valve (2) is normally set at the closed position.
該連通部（１０）に連通ずるリリーフバルブ（９）は、
この前後進油圧回路（４）及びこれに連通する変速油圧
回路（７）の−室以上の油圧を逃がして、該前後進油圧
回路（４）の潤滑油とする。The relief valve (9) communicating with the communication portion (10) is
Hydraulic pressure above the negative chamber of this forward/reverse hydraulic circuit (4) and a transmission hydraulic circuit (7) communicating therewith is released to serve as lubricating oil for the forward/reverse hydraulic circuit (4).
変速油圧回路（７）は、電磁弁形態の変速切換弁（５）
（６）を経て、変速切換クラッチ（ＣＩ） （Ｃ２）
（Ｃ３） （Ｃ４）に連通し、変速切換弁（５）
の電磁操作で変速切換クラッチ（Ｃ１）（Ｃ２）を作動
して、中立位置から第一速位置と第二速位置とに切換え
る。又、変速切換弁（６）の″Ｍ、磁操作で変速切換ク
ラッチ（Ｃ３） （Ｃ４）を作動して、第三速位置と
第四速位置とに切換える。The transmission hydraulic circuit (7) is a transmission switching valve (5) in the form of a solenoid valve.
(6), then the gear change clutch (CI) (C2)
(C3) Communicates with (C4), gear changeover valve (5)
The gear changeover clutches (C1) and (C2) are actuated by electromagnetic operation to switch from the neutral position to the first speed position and the second speed position. In addition, the speed change clutches (C3) and (C4) are operated by magnetic operation of "M" of the speed change changeover valve (6) to switch between the third speed position and the fourth speed position.
変速操作では、いずれかの変速位置の変速切換弁（５）
（６）を選択操作すると、制御装置を介して前後進切換
弁（３）が−旦中立位置に切換えられて、変速伝動装置
への伝動を断ち、続いて変速伝動中であった変速切換弁
（５）（６）が中立位置になって変速クラッチ（Ｃ１）
〜（Ｃ４）が−旦中立位置になる。続いて変速位置とし
て指定された変速切換弁（５）、（６）が切換えられて
、指定の変速クラッチ（ｃｉ）、（Ｃ２）、（Ｃ３）、
又は（Ｃ４）が入りになる。続いて前後進切換クラッチ
（Ｆ）、（Ｒ）が切換えられて、圧力制御弁（２）の制
御による油圧のもとに前後進切換クラッチ（Ｆ）、又は
（Ｒ）が入りになって、変速伝動される。During a gear change operation, the gear changeover valve (5) at either gear position
When (6) is selected, the forward/reverse switching valve (3) is first switched to the neutral position via the control device, cutting off transmission to the speed change transmission, and then the speed change change valve (3) which was in the middle of transmission. (5) (6) is in the neutral position and the transmission clutch (C1)
~(C4) is at the neutral position. Subsequently, the shift changeover valves (5) and (6) designated as the shift positions are switched, and the designated shift clutches (ci), (C2), (C3),
Or (C4) enters. Subsequently, the forward/reverse switching clutch (F) or (R) is switched, and the forward/reverse switching clutch (F) or (R) is engaged under the hydraulic pressure controlled by the pressure control valve (2). Transmitted variable speed.
（１２）はタンクボート、 （１３）は変速クラッチ
（Ｃ１）〜（Ｃ４）のギヤ伝動部に潤滑するための油圧
ポンプである。(12) is a tank boat, and (13) is a hydraulic pump for lubricating the gear transmission parts of the variable speed clutches (C1) to (C4).
第２図、第３図において、上側と異る点は、変速油圧回
路（７）の連通部（８）に切換弁（１４）を設け、変速
切換弁（５）（６）の切換えと連動して油圧をこれらの
変速油圧回路（７）側へ送るように切換える。又、この
変速油圧回路（７）の油圧が高圧になった場合は、この
背圧をリリーフバルブ（９）に働かせて、リリーフバル
ブ（９）の油圧を高めるようになる。 （１５）はリ
リーフバルブである。In Figures 2 and 3, the difference from the upper side is that a switching valve (14) is provided in the communication part (8) of the transmission hydraulic circuit (7), and it is linked with the switching of the transmission switching valves (5) and (6). Then, the hydraulic pressure is switched to be sent to these speed change hydraulic circuits (7). Furthermore, when the hydraulic pressure in the transmission hydraulic circuit (7) becomes high, this back pressure is applied to the relief valve (9) to increase the hydraulic pressure of the relief valve (9). (15) is a relief valve.
又、圧力制御弁（２）の特性曲線は第３図のように殆ん
ど零の位置から高圧に変化する。Further, the characteristic curve of the pressure control valve (2) changes from an almost zero position to a high pressure as shown in FIG.
図はこの発明の実施例を示すもので、第１図は油圧回路
図、第２図は別実施例の油圧回路図、第３図はその一部
の作用を示すグラフである。
図中、符号（１）は油圧ポンプ、（２）は圧力制御弁、
（３）は前後進切換弁、（４）は前後進油圧回路、（５
）（６）は変速切換弁、（７）は変速油圧回路、（８）
は連通部、（９）はリリーフバルブ、（１０）は連通部
、（ＣＩ）〜（Ｃ４）は変速切換クラッチ、（Ｆ）（Ｒ
）は前後進切換クラッチを示す。The drawings show an embodiment of the present invention; FIG. 1 is a hydraulic circuit diagram, FIG. 2 is a hydraulic circuit diagram of another embodiment, and FIG. 3 is a graph showing a part of the operation. In the figure, code (1) is a hydraulic pump, (2) is a pressure control valve,
(3) is a forward/reverse switching valve, (4) is a forward/reverse hydraulic circuit, (5)
) (6) is the speed change switching valve, (7) is the speed change hydraulic circuit, (8)
is a communication part, (9) is a relief valve, (10) is a communication part, (CI) to (C4) are gear changeover clutches, (F) (R
) indicates a forward/reverse switching clutch.
Claims (1)
（３）等を経て前後進切換クラッチ（Ｆ）（Ｒ）へ至る
前後進油圧回路（４）の、該油圧ポンプ（１）と圧力制
御弁（２）との間には、変速切換弁（５）（６）を経て
変速切換クラッチ（Ｃ１）（Ｃ２）（Ｃ３）（Ｃ４）へ
至る変速油圧回路（７）を連通し、この変速油圧回路（
７）の連通部（８）と該圧力制御弁（２）との間には、
リリーフバルブ（９）を連通（１０）してなるトラクタ
等の変速油圧回路。The hydraulic pump (1) of the forward/reverse hydraulic circuit (4) that runs from the hydraulic pump (1) through the pressure control valve (2), the forward/reverse switching valve (3), etc. to the forward/reverse switching clutch (F) (R). and the pressure control valve (2) are connected to a transmission hydraulic circuit (7) which leads to the transmission switching clutches (C1) (C2) (C3) (C4) via the transmission switching valves (5) and (6). , this transmission hydraulic circuit (
7) between the communication part (8) and the pressure control valve (2),
A speed change hydraulic circuit for a tractor, etc., in which a relief valve (9) is connected (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198608A JPH0246367A (en) | 1988-08-08 | 1988-08-08 | Shift hydraulic circuit for tractors, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198608A JPH0246367A (en) | 1988-08-08 | 1988-08-08 | Shift hydraulic circuit for tractors, etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0246367A true JPH0246367A (en) | 1990-02-15 |
Family
ID=16394024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63198608A Pending JPH0246367A (en) | 1988-08-08 | 1988-08-08 | Shift hydraulic circuit for tractors, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246367A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57140950A (en) * | 1981-02-20 | 1982-08-31 | Jidosha Buhin Kogyo Kk | Slip control method and device for reverse reduction gear |
| JPS6283227A (en) * | 1985-10-04 | 1987-04-16 | Kubota Ltd | Hydraulic clutch operating method of hydraulically operated gear transmission |
-
1988
- 1988-08-08 JP JP63198608A patent/JPH0246367A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57140950A (en) * | 1981-02-20 | 1982-08-31 | Jidosha Buhin Kogyo Kk | Slip control method and device for reverse reduction gear |
| JPS6283227A (en) * | 1985-10-04 | 1987-04-16 | Kubota Ltd | Hydraulic clutch operating method of hydraulically operated gear transmission |
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