CN1966998A - Continuously-variable electrohydraulic control valve for use in 4-4.5 ton forklift - Google Patents
Continuously-variable electrohydraulic control valve for use in 4-4.5 ton forklift Download PDFInfo
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- CN1966998A CN1966998A CN 200610096654 CN200610096654A CN1966998A CN 1966998 A CN1966998 A CN 1966998A CN 200610096654 CN200610096654 CN 200610096654 CN 200610096654 A CN200610096654 A CN 200610096654A CN 1966998 A CN1966998 A CN 1966998A
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Abstract
The progressive transmission electro hydraulic controller for 4-4.5T forklift comprises electromagnetic change over valve, shift changing valve and shift changing electromagnetic valve, with the major fuel duct accessing to the fuel duct input port of the shift changing valve, control fuel duct under the control of the shift changing electro magnetic valve connecting with the piston type control cavity of the shift changing valve. Based on the different switch status of the shift changing electro magnetic valve, fuel duct port of the shift changing valve selects connection with either the progress No.1 shift hydraulic clutch or input port of the progress No.2 shift hydraulic clutch, and the operation fuel duct of the back shift hydraulic clutch will be directly provided by electromagnetic change over valve. It can realize progressive transmission electro hydraulic control for local 4-4.5T forklift.
Description
Technical field:
The present invention relates to automobile-used continuously-variable electrohydraulic control valve, the 4-4.5 ton forklift continuously-variable electrohydraulic control valve of more specifically saying so.
Background technique:
4-4.5 ton forklift has three gears, two gears and a slow astern gear promptly advance.At present, the 4-4.5 ton forklift of domestic fork truck industry production all is to adopt the hydraulic machinery hand shifting.4-4.5 ton forklift on the international market all is the stepless change electrichydraulic control basically, but because the difference of the structural difference of gearbox itself, installation dimension, external like product can not supporting use on homemade fork truck.
Summary of the invention:
The present invention is for avoiding above-mentioned existing in prior technology deficiency, the matching used 4-4.5 ton forklift of a kind of and homemade 4-4.5 ton forklift continuously-variable electrohydraulic control valve being provided.
The technological scheme that technical solution problem of the present invention is adopted is:
The present invention is made of solenoid directional control valve, shift valve and gearshift solenoid valve.
Structural feature of the present invention is working connection inserts shift valve by solenoid directional control valve an oil circuit input port; Be communicated with the piston type control chamber of shift valve by the control oil channel of gear shift electromagnetic valve, corresponding to the different on off states of gear shift solenoid valve, the oil circuit input port of shift valve is selected to be communicated with between the input port of the one grade of hydraulic coupling and the second gear hydraulic coupling that advances that advances by shift valve; The working oil path of reverse gear hydraulic coupling is directly provided by solenoid directional control valve.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention directly controls working connection by solenoid directional control valve, compares with the international market like product, and is simple in structure, volume is little.
2, directly use under the situation that the present invention can not make any changes to the gearbox of homemade fork truck (as closing fork, Hangzhoupro fork), matching performance is good, has greatly reduced the technical innovation cost and the cost of production of main engine factory.
3, the present invention makes the 4-4.5 ton forklift realize the stepless change electrichydraulic control, i.e. speed change automation has greatly reduced vehicle drive personnel's technical requirements.
4, the present invention can be provided with the low speed locking switch by increasing in circuitry, so that limit car speed under specific circumstances, it is safer that vehicle is used.
5, the present invention has created condition for China's 4-4.5 ton forklift moves towards the international market.
Description of drawings:
Fig. 1 is a system architecture schematic representation of the present invention.
Fig. 2 one grade of oil circuit schematic representation that advances for the present invention is in.
Fig. 3 second gear oil circuit schematic representation that advances for the present invention is in.
Fig. 4 is in reverse gear oil circuit schematic representation for the present invention.
Number in the figure: 1 inching valve, 2 modulating valve, 3 accumulators, 4 solenoid directional control valves, 5 shift valves, 6 gear shift solenoid valves, 7 pressure fixing valves, 8 safety valves, 9 torque-converters, 10 radiators, 11 filters, 12 reverse gear hydraulic couplinges, 13 advance one grade of hydraulic coupling, 14 advance second gear clutch hydraulic coupling, 15 control oil channel, 16 working connections.
Below pass through embodiment, and in conjunction with the accompanying drawings the present invention be further described:
Embodiment:
Referring to Fig. 1, the present embodiment electro-hydraulic control valve is to be made of solenoid directional control valve 4, shift valve 5 and gearshift solenoid valve 6, and working connection 16 inserts the oil circuit input port of shift valve 5 by solenoid directional control valve 4; Be communicated with the piston type control chamber of shift valve 5 by the control oil channel 15 of gear shift solenoid valve 6 controls, corresponding to the different on off states of gear shift solenoid valve 6, the oil circuit input port of shift valve 5 is selected to be communicated with between the input port of the one grade of hydraulic coupling 13 and the second gear hydraulic coupling 14 that advances that advances by shift valve 5; The working oil path of reverse gear hydraulic coupling 12 is directly provided by solenoid directional control valve 4.
As shown in Figure 1, according to the routine setting, the system of present embodiment formation also comprises inching valve 1, modulating valve 2, accumulator 3, pressure fixing valve 7, safety valve 8, torque-converters 9, radiator 10 and filter 11.
State shown in Figure 2 is for advancing one grade: at this moment, vehicle is at lower-speed state, gear shift solenoid valve 6 pressure releases of oil pressure in the control oil channel 15 by often opening, oil pressure in the control oil channel 15 is zero, shift valve 5 will directly be linked in the one grade of hydraulic coupling 13 that advances from the pressure of the working connection 16 of solenoid directional control valve 4, and vehicle is in the one grade of state that advances.
State shown in Figure 3 is the second gear that advances: at this moment, car speed rises to setting value, the velocity transducer that is installed in gearbox output gear position is given central control circuit with the speed acquisition information conveyance, central control circuit is to gear shift solenoid valve 6 output voltage control signals, gear shift solenoid valve 6 is closure, pressure release passage is cut off, the oil pressure of control oil channel 15 raises, thereby the piston that promotes shift valve 5 moves to right, to switch to second gear hydraulic coupling 14 from the working connection pressure of working connection 16, car speed enters the second gear state.
When car speed drops to setting value, central control circuit disappears to the voltage control signal that gear shift solenoid valve 6 provides, gear shift solenoid valve 6 reverts to Chang Kai and pressure release, the piston of shift valve 5 is return left end because of the restoring force of spring, working connection pressure from working connection 16 switches to the one grade of hydraulic coupling 13 that advances again, and vehicle returns to one grade by second gear automatically.State shown in Figure 4 is a reverse gear: the operating oil pressure of reverse gear hydraulic coupling 12 is directly provided by solenoid directional control valve 4 without shift valve 5.Gear shift solenoid valve 6 no matter turn-off or closed state under, the reverse gear hydraulic coupling is not all exerted an influence.
Claims (1)
1,4-4.5 ton forklift continuously-variable electrohydraulic control valve is made of solenoid directional control valve, shift valve and gearshift solenoid valve, it is characterized in that working connection (16) inserts the oil circuit input port of shift valve (5) by solenoid directional control valve (4); Be communicated with the piston type control chamber of described shift valve (5) by the control oil channel (15) of gear shift solenoid valve (6) control, corresponding to the different on off states of gear shift solenoid valve (6), the oil circuit input port of shift valve (5) is selected to be communicated with between the input port of the one grade of hydraulic coupling (13) and second gear hydraulic coupling (14) of advancing that advances by shift valve (5); The working oil path of reverse gear hydraulic coupling (12) is directly provided by solenoid directional control valve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610096654 CN1966998A (en) | 2006-10-14 | 2006-10-14 | Continuously-variable electrohydraulic control valve for use in 4-4.5 ton forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610096654 CN1966998A (en) | 2006-10-14 | 2006-10-14 | Continuously-variable electrohydraulic control valve for use in 4-4.5 ton forklift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1966998A true CN1966998A (en) | 2007-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610096654 Pending CN1966998A (en) | 2006-10-14 | 2006-10-14 | Continuously-variable electrohydraulic control valve for use in 4-4.5 ton forklift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1966998A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527826A (en) * | 2013-10-29 | 2014-01-22 | 合肥今典机械科技有限公司 | Safety valve for hydraulic forklift speed changing box control valve |
| CN106438540A (en) * | 2016-10-09 | 2017-02-22 | 合肥协力液压科技有限公司 | Electromagnetic speed reduction manual control valve |
| CN112249981A (en) * | 2020-09-30 | 2021-01-22 | 安徽合力股份有限公司 | Forklift traveling system |
-
2006
- 2006-10-14 CN CN 200610096654 patent/CN1966998A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527826A (en) * | 2013-10-29 | 2014-01-22 | 合肥今典机械科技有限公司 | Safety valve for hydraulic forklift speed changing box control valve |
| CN106438540A (en) * | 2016-10-09 | 2017-02-22 | 合肥协力液压科技有限公司 | Electromagnetic speed reduction manual control valve |
| CN112249981A (en) * | 2020-09-30 | 2021-01-22 | 安徽合力股份有限公司 | Forklift traveling system |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |