JPH02117470U - - Google Patents
Info
- Publication number
- JPH02117470U JPH02117470U JP2740389U JP2740389U JPH02117470U JP H02117470 U JPH02117470 U JP H02117470U JP 2740389 U JP2740389 U JP 2740389U JP 2740389 U JP2740389 U JP 2740389U JP H02117470 U JPH02117470 U JP H02117470U
- Authority
- JP
- Japan
- Prior art keywords
- power shift
- shift transmission
- pump
- pressure
- electromagnetic proportional
- 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 7
- 238000010586 diagram Methods 0.000 description 2
Description
図面は本考案の実施例を示し、第１図は油圧制
御系統を示す回路図、第２図はトラクタミツシヨ
ンの概念図である。
７，９，１０……パワーシフト変速機、１５，
１６，１７，１８……操作手段、１９……コント
ロール用回路、２０……制御部、２４……ポンプ
側回路、２５……電磁比例弁、２７……圧力スイ
ツチ、２８……切換弁。
The drawings show an embodiment of the present invention, and FIG. 1 is a circuit diagram showing a hydraulic control system, and FIG. 2 is a conceptual diagram of a tractor transmission. 7,9,10...power shift transmission, 15,
16, 17, 18... operating means, 19... control circuit, 20... control section, 24... pump side circuit, 25... electromagnetic proportional valve, 27... pressure switch, 28... switching valve.
Claims (1)
９，１０を備え、該パワーシフト変速機７，９，
１０をオンオフする操作手段１５，１６，１７，
１８を備え、前記パワーシフト変速機７，９，１
０に油圧を送液するポンプ側回路２４に、電磁比
例弁２５を備えたものにおいて、 前記パワーシフト変速機７，９，１０をオフか
らオンに切換えたときのパイロツト圧で作動する
圧力スイツチ２７を、前記電磁比例弁２５の手前
におけるコントロール用回路１９に設け、前記電
磁比例弁２５の初期圧力を昇圧するための切換弁
２８を、ポンプ側回路２４に導通すべく圧力スイ
ツチ２７と連動させて設けたことを特徴とするト
ラクタのパワーシフト変速装置。[Scope of claim for utility model registration] A power shift transmission 7,
9, 10, the power shift transmission 7, 9,
Operating means 15, 16, 17, for turning on and off 10;
18, the power shift transmission 7, 9, 1
In the pump-side circuit 24 that sends hydraulic pressure to the pump, the pressure switch 27 is operated by the pilot pressure when the power shift transmissions 7, 9, and 10 are switched from off to on. is provided in the control circuit 19 in front of the electromagnetic proportional valve 25, and a switching valve 28 for increasing the initial pressure of the electromagnetic proportional valve 25 is linked with the pressure switch 27 to connect to the pump side circuit 24. A power shift transmission device for a tractor, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2740389U JPH02117470U (en) | 1989-03-10 | 1989-03-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2740389U JPH02117470U (en) | 1989-03-10 | 1989-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02117470U true JPH02117470U (en) | 1990-09-20 |
Family
ID=31249865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2740389U Pending JPH02117470U (en) | 1989-03-10 | 1989-03-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02117470U (en) |
-
1989
- 1989-03-10 JP JP2740389U patent/JPH02117470U/ja active Pending