JPH037198U - - Google Patents
Info
- Publication number
- JPH037198U JPH037198U JP6670989U JP6670989U JPH037198U JP H037198 U JPH037198 U JP H037198U JP 6670989 U JP6670989 U JP 6670989U JP 6670989 U JP6670989 U JP 6670989U JP H037198 U JPH037198 U JP H037198U
- Authority
- JP
- Japan
- Prior art keywords
- pump
- control lever
- lift
- oil
- pressure
- 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
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Description
第１図は本考案の実施例における油圧回路図、
第２図は同上のシステムブロツク図、第３図は同
上の制御フロー図、第４図は従来の油圧システム
を示す回路図である。
１……コントローラ、２……リフトシリンダ部
圧力センサ、３，４……レバー部マイクロスイツ
チ、６……タンデムポンプ、７……切換バルブ、
８……リフトシリンダ、１１……電磁バルブ。
Fig. 1 is a hydraulic circuit diagram in an embodiment of the present invention;
FIG. 2 is a system block diagram similar to the above, FIG. 3 is a control flow diagram similar to the above, and FIG. 4 is a circuit diagram showing a conventional hydraulic system. 1... Controller, 2... Lift cylinder pressure sensor, 3, 4... Lever micro switch, 6... Tandem pump, 7... Switching valve,
8...Lift cylinder, 11...Solenoid valve.
Claims (1)
ポンプの吐出油量を合流又は分流ドレンさせる切
換バルブと、該切換バルブを作動させる電磁バル
ブと、リフトコントロールレバー、チルトコント
ロールレバー及びアタツチメントコントロールレ
バーの動作位置の電気信号とリフトシリンダの保
持圧の電気信号とを受け該電磁バルブを制御する
コントローラとからなり、リフト回路の一定圧以
下で且つリフトコントロールレバー操作時に、該
第１ポンプ及び第２ポンプの吐出油を切換バルブ
で合流して全油量をリフトシリンダに送油し、リ
フト回路の一定圧以上、又は一定圧以下でもチル
トコントロールレバー又はアタツチメントコント
ロールレバーの操作時は、第２ポンプの吐出油量
を油タンクヘドレンさせるように構成したことを
特徴とするフオークリフトのリフト速度切換え装
置。 A first pump and a second pump constituting a tandem pump
A switching valve that merges or separates the amount of oil discharged from the pump, an electromagnetic valve that operates the switching valve, electrical signals for the operating positions of the lift control lever, tilt control lever, and attachment control lever, and the holding pressure of the lift cylinder. and a controller that receives an electric signal from the pump and controls the electromagnetic valve.When the lift circuit pressure is below a certain pressure and the lift control lever is operated, the discharge oil of the first pump and the second pump are combined at a switching valve to completely discharge the oil. The amount of oil is sent to the lift cylinder, and even if the pressure in the lift circuit is above a certain pressure or below a certain pressure, when operating the tilt control lever or attachment control lever, the amount of oil discharged from the second pump is drained to the oil tank. A forklift lift speed switching device characterized by the following configurations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6670989U JPH037198U (en) | 1989-06-09 | 1989-06-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6670989U JPH037198U (en) | 1989-06-09 | 1989-06-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH037198U true JPH037198U (en) | 1991-01-23 |
Family
ID=31599646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6670989U Pending JPH037198U (en) | 1989-06-09 | 1989-06-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH037198U (en) |
-
1989
- 1989-06-09 JP JP6670989U patent/JPH037198U/ja active Pending