CN2744899Y - Four-shift automatic shifting electro-hydraulic control valve for fork trucks - Google Patents
Four-shift automatic shifting electro-hydraulic control valve for fork trucks Download PDFInfo
- Publication number
- CN2744899Y CN2744899Y CN 200420108971 CN200420108971U CN2744899Y CN 2744899 Y CN2744899 Y CN 2744899Y CN 200420108971 CN200420108971 CN 200420108971 CN 200420108971 U CN200420108971 U CN 200420108971U CN 2744899 Y CN2744899 Y CN 2744899Y
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- Prior art keywords
- valve
- shift
- shifting
- gear
- oil passage
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- Gear-Shifting Mechanisms (AREA)
Abstract
The utility model relates to a four-shift automatic shifting electro-hydraulic control valve for fork trucks, which is characterized in that the utility model is composed of a reversing magnetic valve, a shifting valve, and a shifting magnetic valve. A main oil passage accesses a forward gear oil passage input port or a backward gear oil passage input port by the reversing magnetic valve; the control oil passage controlled by the shifting magnetic valve is communicated with the control cavity of the shifting valve; the control cavity of the shifting valve is a piston type cavity body corresponding to different on-off states of the shifting magnetic valve; the forward gear oil passage input port of the shifting valve is selectly communicated between a forward second gear oil passage and a forward first gear oil passage of a forward clutch by the shifting valve; the backward gear oil passage input port of the shifting valve is selectly communicated between a backward first gear oil passage and a backward second gear oil passage of a backward clutch by the shifting valve. The utility model gets an engineering truck produced by national techniques realize automatically shifting in a simpler structural form.
Description
Technical field:
The utility model relates to electro-hydraulic control valve, a kind of fork truck of more specifically saying so fourth gear position automaitc shfit electro-hydraulic control valve.
Background technique:
At present, home products comprises the various engineering vehicle of fork truck, remains the employing hydraulic transmission, the manually-operable gear shift, but this technology lags far behind the demand of international market.External like product not only complex structure, volume is big, cost is high, and is not inconsistent with the change-box interface of domestic vehicle, selects the import electro-hydraulic control valve for use, also needs to introduce matching used gearbox.
Summary of the invention:
The utility model is for avoiding above-mentioned existing in prior technology deficiency, a kind of have two forward gearss, two fork truck fourth gear position automaitc shfit electro-hydraulic control valves that retreat shelves are provided, under the condition that does not change gearbox, realize automaitc shfit with the engineering truck that comparatively simple structural type is produced domestic current techniques, improve the technology content of vehicle.
The technological scheme that the utility model technical solution problem is adopted is:
Structural feature of the present utility model is:
The utility model is made of reversing solenoid valve, shift valve and gear shift solenoid valve, and working connection inserts the forward gears oil circuit input port of shift valve or retreats a grade oil circuit input port through reversing solenoid valve; Be communicated with the control chamber of described shift valve by the control oil channel of gear shift electromagnetic valve, the control chamber of described shift valve is the piston type cavity, different on off states corresponding to the gear shift solenoid valve, the forward gears oil circuit input port of shift valve is selected to be communicated with between one grade of oil circuit with advancing at the second gear oil circuit that advances of forward clutch by shift valve, and grade oil circuit input port that retreats of shift valve is selected between the second gear oil circuit to be communicated with retreating at the slow astern shelves oil circuit of back clutch by shift valve.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
1, the utility model makes the engineering truck of domestic current production realize automaitc shfit with comparatively simple structural type, has greatly simplified the actual of engineering truck controlled, and improves the technology content of vehicle.
2, the utility model is simple and compact for structure, compares with external like product, and its volume is little, valve pocket is few, cost is low, for the production of domestic fork truck, can directly improve and does not need to introduce the import gearbox.
3, the utility model is widely used in 4.5 tons-10 tons various fork truck, is applicable to other engineering vehicle too.
Description of drawings:
Accompanying drawing is the utility model structural representation.
Number in the figure: 1 reversing solenoid valve, 2 shift valves, 3 gear shift solenoid valves, 4 working connections, 5 forward gears oil circuit input ports, 6 retreat a grade oil circuit input port, 7 control oil channel, 8 control chambers, 9 forward clutch, 10 advance one grade of oil circuit, 11 advance second gear oil circuit, 12 back clutch, 13 slow astern shelves oil circuits, the logical second gear oil circuits in 14 backs, 15 accumulators, 16 inching valves, 17 modulating valve, 18 total oil circuits, 19 safety valves, 20 pressure fixing valves.
Embodiment:
Referring to accompanying drawing, constitute by reversing solenoid valve 1, shift valve 2 and gear shift solenoid valve 3.In concrete the enforcement, reversing solenoid valve 1 is the 3-position 4-way reversing solenoid valve; Gear shift solenoid valve 3 is a bi-bit bi-pass gear shift solenoid valve.
Shown in the figure, working connection 4 inserts the forward gears oil circuit input port 5 of shift valve 2 or retreats a grade oil circuit input port 6 through reversing solenoid valve 1; Be communicated with the control chamber 8 of shift valve 2 by the control oil channel 7 of gear shift solenoid valve 3 controls, the control chamber 8 of shift valve 2 is the piston type cavity, different on off states corresponding to gear shift solenoid valve 3, the forward gears oil circuit input port 5 of shift valve 2 is selected to be communicated with between one grade of oil circuit 11 with advancing at the second gear oil circuit 10 that advances of forward clutch 9 by shift valve 2, and grade oil circuit input port 6 that retreats of shift valve 2 is selected between the second gear oil circuit 14 to be communicated with retreating at the slow astern shelves oil circuit 13 of back clutch 12 by shift valve 2.
As shown in FIG., according to the routine setting, present embodiment should be provided with accumulator 15, inching valve 16 and modulating valve 17 equally in working connection 4, in total oil circuit 18, safety valve 19 and pressure fixing valve 20 should be set.
Meanwhile, should include in the circuit velocity transducer, be the governor circuit of input signal with the velocity transducer testing signal.
The gearbox output gear is when the low speed attitude, and gear shift solenoid valve 3 is not worked, and the oil pressure of control oil channel 7 is zero, by the 3-position 4-way solenoid directional control valve pressure oil is passed to advance one grade or slow astern shelves.When the rotating speed of gearbox output gear increases, velocity transducer is passed to governor circuit to relevant information, offer gear shift electromagnetic valve voltage signal by governor circuit, the gear shift solenoid valve cuts out the oil circuit drain tap immediately, and the oil pressure of control oil channel 7 raises, and shift valve is under the oil pressure effect, change the oil circuit position high pressure oil pressure of working connection 4 is passed to the top gear hydraulic coupling, at this moment, advance one grade, just change to the second gear that advances automatically if car was in originally; If car was in the slow astern shelves originally, just automatically switches to and retreat second gear.When fork truck under fast state, as turning down because of throttle, or the increase of vehicle grade resistance, the rotating speed of the output gear of gearbox just begins to descend, and the electrical signal that the testing signal that velocity transducer is relevant makes main control circuit offer the gear shift solenoid valve disappears, the gear shift solenoid valve quits work, the piston of shift valve is returned to one grade, at this moment under the effect of spring force, if just switching at the second gear that advances, car marches forward one grade, if will switch on the slow astern shelves retreating second gear.Realize automaticallying switch.
Claims (2)
1, fork truck fourth gear position automaitc shfit electro-hydraulic control valve, its feature is made of reversing solenoid valve (1), shift valve (2) and gear shift solenoid valve (3), and working connection (4) inserts the forward gears oil circuit input port (5) of shift valve (2) or retreats a grade oil circuit input port (6) through reversing solenoid valve (1); Be communicated with the control chamber (8) of described shift valve (2) by the control oil channel (7) of gear shift solenoid valve (3) control, the control chamber (8) of described shift valve (2) is the piston type cavity, different on off states corresponding to gear shift solenoid valve (3), the forward gears oil circuit input port (5) of shift valve (2) is selected to be communicated with between one grade of oil circuit (11) with advancing at the second gear oil circuit (10) that advances of forward clutch (9) by shift valve (2), and grade oil circuit input port (6) that retreats of shift valve (2) is selected to be communicated with retreating between the second gear oil circuit (14) at the slow astern shelves oil circuit (13) of back clutch (12) by shift valve (2).
2, fork truck according to claim 1 is characterized in that with fourth gear position automaitc shfit electro-hydraulic control valve described reversing solenoid valve (1) is the 3-position 4-way reversing solenoid valve; Described gear shift solenoid valve (3) is a bi-bit bi-pass gear shift solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108971 CN2744899Y (en) | 2004-11-17 | 2004-11-17 | Four-shift automatic shifting electro-hydraulic control valve for fork trucks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420108971 CN2744899Y (en) | 2004-11-17 | 2004-11-17 | Four-shift automatic shifting electro-hydraulic control valve for fork trucks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2744899Y true CN2744899Y (en) | 2005-12-07 |
Family
ID=35579680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420108971 Expired - Fee Related CN2744899Y (en) | 2004-11-17 | 2004-11-17 | Four-shift automatic shifting electro-hydraulic control valve for fork trucks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2744899Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334977A (en) * | 2013-07-24 | 2013-10-02 | 合肥协力仪表控制技术股份有限公司 | Electro-hydraulic control valve for gearbox of tractor |
| CN104712752A (en) * | 2015-03-16 | 2015-06-17 | 林德（中国）叉车有限公司 | High-speed reversing protection device for gearbox |
| 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 |
| CN106499687A (en) * | 2016-10-09 | 2017-03-15 | 合肥协力液压科技有限公司 | A kind of fluid drive electric hydraulic control valve |
-
2004
- 2004-11-17 CN CN 200420108971 patent/CN2744899Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334977A (en) * | 2013-07-24 | 2013-10-02 | 合肥协力仪表控制技术股份有限公司 | Electro-hydraulic control valve for gearbox of tractor |
| CN104712752A (en) * | 2015-03-16 | 2015-06-17 | 林德（中国）叉车有限公司 | High-speed reversing protection device for gearbox |
| 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 |
| CN106499687A (en) * | 2016-10-09 | 2017-03-15 | 合肥协力液压科技有限公司 | A kind of fluid drive electric hydraulic control valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051207 Termination date: 20121117 |