JP2575089Y2 - Forklift hydraulic circuit - Google Patents
Forklift hydraulic circuitInfo
- Publication number
- JP2575089Y2 JP2575089Y2 JP1993014283U JP1428393U JP2575089Y2 JP 2575089 Y2 JP2575089 Y2 JP 2575089Y2 JP 1993014283 U JP1993014283 U JP 1993014283U JP 1428393 U JP1428393 U JP 1428393U JP 2575089 Y2 JP2575089 Y2 JP 2575089Y2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic proportional
- pressure reducing
- reducing valve
- valve
- proportional 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.)
- Expired - Lifetime
Links
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、リフトシリンダの背圧
を利用して電磁比例減圧弁付電磁比例コントロール弁を
作動させるフォークリフトの油圧回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit of a forklift for operating an electromagnetic proportional control valve with an electromagnetic proportional pressure reducing valve by using the back pressure of a lift cylinder.
【０００２】[0002]
【従来の技術】従来のフォークリフトの油圧回路（以下
従来回路という。）は、図３に図示するように、リフト
シリンダ６のボトム室と電磁比例減圧弁付電磁比例コン
トロール弁１２とは管路１４で、該電磁比例減圧弁付電
磁比例コントロール弁１２とポンプ９とは管路１５で接
続され、該管路１５から分岐した管路１６は減圧弁１３
を介して上記電磁比例減圧弁付電磁比例コントロール弁
１２の電磁比例減圧弁部１２Ａ、１２Ｂに接続されて、
上記ポンプ９はモータ１０に直結され、該モータ１０を
回転駆動させることによってポンプ９を駆動する。なお
８はタンク、２５はシ−ケンス弁で、増圧用に使用され
るものである。2. Description of the Related Art As shown in FIG. 3, a hydraulic circuit of a conventional forklift (hereinafter referred to as a conventional circuit) is configured such that a bottom chamber of a lift cylinder 6 and an electromagnetic proportional control valve 12 with an electromagnetic proportional pressure reducing valve are connected to a line 14. The electromagnetic proportional control valve 12 with the electromagnetic proportional pressure reducing valve and the pump 9 are connected by a pipe 15, and a pipe 16 branched from the pipe 15 is a pressure reducing valve 13.
Is connected to the electromagnetic proportional pressure reducing valve portions 12A and 12B of the electromagnetic proportional pressure reducing valve 12 with the electromagnetic proportional pressure reducing valve,
The pump 9 is directly connected to a motor 10, and drives the pump 9 by rotating the motor 10. Reference numeral 8 denotes a tank, and 25 denotes a sequence valve, which is used for increasing pressure.
【０００３】[0003]
【考案が解決しようとする課題】従来技術は、上述のよ
うに、リフトシリンダ６が下降する際，該リフトシリン
ダ６のボトム室から電磁比例減圧弁付電磁比例コントロ
ール弁１２を経てタンク８へと圧油が排出される。この
際電磁比例減圧弁付電磁比例コントロール弁１２の電磁
比例減圧弁部側に圧油を供給し、電磁比例減圧弁付電磁
比例コントロール弁１２のポートを切り換える必要性か
ら、上記モータを回転してポンプ９を駆動しなければな
らず、バッテリの消費量が大となり、容量に限りあるバ
ッテリフォークでは荷役作業回数が低下するという課題
が生じていた。本考案は、上述の課題を解決するために
案出されたものである。According to the prior art, as described above, when the lift cylinder 6 descends, it is transferred from the bottom chamber of the lift cylinder 6 to the tank 8 via the electromagnetic proportional control valve 12 with an electromagnetic proportional pressure reducing valve. Pressure oil is discharged. At this time, it is necessary to supply pressure oil to the electromagnetic proportional pressure reducing valve side of the electromagnetic proportional pressure reducing valve with the electromagnetic proportional pressure reducing valve 12 and to switch the port of the electromagnetic proportional pressure reducing valve with the electromagnetic proportional pressure reducing valve 12, so that the motor is rotated. The pump 9 must be driven, which consumes a large amount of battery, and a battery fork having a limited capacity has a problem in that the number of cargo handling operations decreases. The present invention has been made to solve the above-mentioned problem.
【０００４】[0004]
【課題を解決するための手段】本考案は、電磁比例減圧
弁付電磁比例コントロール弁の作動によってリフトシリ
ンダに圧油を供給し、フォークを上昇させるフォークリ
フトの油圧回路において、上記電磁比例減圧弁付電磁比
例コントロール弁とリフトシリンダとを接続する管路か
ら分岐する管路に、フォーク下降を指示する信号にて作
動する電磁弁と互いに逆向きに接続したチエック弁を挿
入し、該チエック弁との間から分岐する管路を上記電磁
比例減圧弁付電磁比例コントロール弁に電磁比例減圧弁
部に接続して、リフトシリンダの下降時に排出される圧
油で上記電磁比例減圧弁付電磁比例コントロール弁を作
動させる構成とし、上述の課題を解決したものである。SUMMARY OF THE INVENTION The present invention relates to a hydraulic circuit of a forklift for supplying pressurized oil to a lift cylinder by operating an electromagnetic proportional control valve with an electromagnetic proportional pressure reducing valve, and for raising the fork. A check valve connected in the opposite direction to an electromagnetic valve operated by a signal instructing fork lowering is inserted into a pipe branching from a pipe connecting the electromagnetic proportional control valve and the lift cylinder, and the check valve is connected to the check valve. The pipe branching from between is connected to the electromagnetic proportional pressure reducing valve with the electromagnetic proportional pressure reducing valve with the electromagnetic proportional pressure reducing valve. It is configured to operate and solves the above-mentioned problem.
【０００５】[0005]
【実施例】本考案の１実施例をカウンタ式フォ−クリフ
トを例にとり図１、図２に基づき説明すると、図１は本
考案を具体化したフォークリフトの側面図で、カウンタ
式フォークリフト１、該カウンタ式フォークリフト１の
車体２、該車体２の前方に立設したマスト３、該マスト
３でガイドされつつ上昇・下降するリフトブラケット
４、該リフトブラケット４に係止されたフォーク５、前
記リフトブラケット４を上昇させるリフトシリンダ６
で、マスト３後部に配置固定され、上記カウンタ式フォ
ークリフト１の上部に、カウンタ式フォークリフト１が
前進・後進等各種の走行・荷役作業を指示するジョイス
テイック７に設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 and 2 taking a counter-type forklift as an example. FIG. 1 is a side view of a forklift embodying the present invention. A vehicle body 2 of a counter-type forklift 1; a mast 3 erected in front of the vehicle body 2; a lift bracket 4 that rises and falls while being guided by the mast 3; Lift cylinder 6 for raising 4
The counter type forklift 1 is provided on the joystick 7 for instructing various traveling and cargo handling operations such as forward and backward movements on the counter type forklift 1.
【０００６】車体２内には、油が蓄えられるタンク８が
形成されるとともに該タンク８から油を汲み上げるポン
プ９、該ポンプ９を駆動するモータ１０、増圧用に使用
されるシーケンス弁２５がそれぞれ配置されている。In the vehicle body 2, a tank 8 for storing oil is formed, and a pump 9 for pumping oil from the tank 8, a motor 10 for driving the pump 9, and a sequence valve 25 used for pressure increase are respectively provided. Are located.
【０００７】図２は本考案の油圧回路図で、リフトシリ
ンダ６のボトム室と電磁比例減圧弁付電磁比例コントロ
ール弁１２とは管路１４で、該電磁比例減圧弁付電磁比
例コントロール弁１２とポンプ９とは管路１５で接続さ
れ、該管路１５から分岐した管路２１は互いに逆向きに
配置したチエック弁１９、２０とフォーク下降を指示す
る信号にて作動する電磁切換弁１８を介して上記リフト
シリンダ６のボトム室に接続され、チエック弁１９、２
０の間から分岐した管路２２は減圧弁１３を介して上記
電磁比例減圧弁付電磁比例コントロール弁１２の電磁比
例減圧弁部１２Ａ、１２Ｂに接続されている。FIG. 2 is a hydraulic circuit diagram of the present invention. The bottom chamber of the lift cylinder 6 and the electromagnetic proportional control valve 12 with an electromagnetic proportional pressure reducing valve are connected to a line 14. The pipe 9 is connected to the pump 9 through a pipe 15, and a pipe 21 branched from the pipe 15 is provided via check valves 19 and 20 arranged in opposite directions to each other and an electromagnetic switching valve 18 operated by a signal for instructing fork lowering. Connected to the bottom chamber of the lift cylinder 6 and check valves 19, 2
The pipeline 22 branched from between 0 is connected to the electromagnetic proportional pressure reducing valve portions 12A and 12B of the electromagnetic proportional pressure reducing valve 12 with the electromagnetic proportional pressure reducing valve via the pressure reducing valve 13.
【０００８】[0008]
【作用】上記フォーク５を下降させるべく、ジョイステ
イック１２を操作すると、電磁切換弁１８のコイル（図
示せず）と電磁比例減圧弁付電磁比例コントロール弁１
２のコイル（図示せず）に電流が流れ、電磁切換弁１８
がａ側に切り換わり、リフトシリンダ６から排出される
圧油が電磁切換弁１８、チエック弁１９、減圧弁１３お
よび電磁比例減圧弁部１２Ｂ側に供給され、電磁比例減
圧弁付電磁比例コントロール弁１２のポートが（ｂ）側
に切り換わり、最終的にはリフトシリンダ６から排出さ
れる圧油は電磁比例減圧弁付電磁比例コントロール弁１
２を経てタンク８に戻る。When the joystick 12 is operated to lower the fork 5, the coil (not shown) of the electromagnetic switching valve 18 and the electromagnetic proportional control valve 1 with the electromagnetic proportional pressure reducing valve are operated.
Current flows through the second coil (not shown), and the electromagnetic switching valve 18
Is switched to the a side, and the pressure oil discharged from the lift cylinder 6 is supplied to the electromagnetic switching valve 18, the check valve 19, the pressure reducing valve 13, and the electromagnetic proportional pressure reducing valve portion 12B side, and the electromagnetic proportional control valve with the electromagnetic proportional pressure reducing valve is provided. The port 12 is switched to the (b) side, and the hydraulic oil finally discharged from the lift cylinder 6 is supplied to the electromagnetic proportional control valve 1 with the electromagnetic proportional pressure reducing valve.
After that, return to the tank 8.
【０００９】[0009]
【考案の効果】本考案は、上述のように、リフトシリン
ダ６から排出される圧油が電磁切換弁１８、チエック弁
１９、減圧弁１３および電磁比例減圧弁１２Ｂに供給さ
れ、電磁比例減圧弁付電磁比例コントロール弁１２のポ
ートがｂ側に切り換わる動作を、モータを駆動せずに行
なえるので、電力消費量が低減され、１日の荷役作業回
数も低減させることないバッテリフォークリフトを提供
できる。According to the present invention, as described above, the pressure oil discharged from the lift cylinder 6 is supplied to the electromagnetic switching valve 18, the check valve 19, the pressure reducing valve 13, and the electromagnetic proportional pressure reducing valve 12B, and the electromagnetic proportional pressure reducing valve is provided. Since the operation of switching the port of the attached electromagnetic proportional control valve 12 to the b-side can be performed without driving the motor, it is possible to provide a battery forklift that reduces power consumption and does not reduce the number of times of daily cargo handling. .
【図１】本考案のカウンタ式フォークリフトの側面図で
ある。FIG. 1 is a side view of the counter forklift of the present invention.
【図２】本考案の油圧回路図である。FIG. 2 is a hydraulic circuit diagram of the present invention.
【図３】従来の油圧回路図である。FIG. 3 is a conventional hydraulic circuit diagram.
１ カウンタ式フオークリフト ２ 車体 １２ 電磁比例減圧弁付電磁比例コントロール弁 １３ 減圧弁 １８ 電磁切換弁 １９ ２０ チエック弁 REFERENCE SIGNS LIST 1 counter type forklift 2 body 12 electromagnetic proportional control valve with electromagnetic proportional pressure reducing valve 13 pressure reducing valve 18 electromagnetic switching valve 19 20 check valve
Claims (1)
弁の作動によってリフトシリンダに圧油を供給し、フォ
ークを上昇させるフォークリフトの油圧回路において、
上記電磁比例減圧弁付電磁比例コントロール弁とリフト
シリンダとを接続する管路から分岐する管路に、フォー
ク下降を指示する信号にて作動する電磁弁と互いに逆向
きに接続したチエック弁を挿入し、該チエック弁との間
から分岐する管路を上記電磁比例減圧弁付電磁比例コン
トロール弁の電磁比例減圧弁部に接続して、リフトシリ
ンダの下降時に排出される圧油で上記電磁比例減圧弁付
電磁比例コントロール弁を作動させることを特徴とする
フォークリフトの油圧回路。In a hydraulic circuit of a forklift for supplying a pressurized oil to a lift cylinder by operating an electromagnetic proportional control valve with an electromagnetic proportional pressure reducing valve to raise a fork,
Insert a check valve connected in the opposite direction to the solenoid valve operated by a signal for instructing fork lowering, into a pipe branching from the pipe connecting the electromagnetic proportional control valve with the electromagnetic proportional pressure reducing valve and the lift cylinder. Connecting a pipe branching from the check valve to the electromagnetic proportional pressure reducing valve portion of the electromagnetic proportional pressure reducing valve with the electromagnetic proportional pressure reducing valve, and using the pressure oil discharged when the lift cylinder descends, the electromagnetic proportional pressure reducing valve A hydraulic circuit for a forklift, characterized by actuating an electromagnetic proportional control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993014283U JP2575089Y2 (en) | 1993-03-02 | 1993-03-02 | Forklift hydraulic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993014283U JP2575089Y2 (en) | 1993-03-02 | 1993-03-02 | Forklift hydraulic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0667496U JPH0667496U (en) | 1994-09-22 |
| JP2575089Y2 true JP2575089Y2 (en) | 1998-06-25 |
Family
ID=11856770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993014283U Expired - Lifetime JP2575089Y2 (en) | 1993-03-02 | 1993-03-02 | Forklift hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2575089Y2 (en) |
-
1993
- 1993-03-02 JP JP1993014283U patent/JP2575089Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0667496U (en) | 1994-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980303 |