CN209242610U - Hydraulic steering system and fork truck - Google Patents
Hydraulic steering system and fork truck Download PDFInfo
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- CN209242610U CN209242610U CN201821779868.6U CN201821779868U CN209242610U CN 209242610 U CN209242610 U CN 209242610U CN 201821779868 U CN201821779868 U CN 201821779868U CN 209242610 U CN209242610 U CN 209242610U
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- oil
- control valve
- hydraulic
- hydraulic steering
- oil circuit
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Abstract
This disclosure relates to a kind of hydraulic steering system and fork truck, the system includes fuel tank, motor, oil pump, all-hydraulic steering gear, steering cylinder and accumulator, motor is for driving oil pump to run, the oil outlet of oil pump is connected by the first oil circuit with the oil inlet of all-hydraulic steering gear, accumulator is connected by the second oil circuit with the oil inlet of all-hydraulic steering gear, the first actuator port and the second actuator port of all-hydraulic steering gear are connected with steering cylinder, the oil return opening of all-hydraulic steering gear is connected with fuel tank, the first control valve is provided on second oil circuit, first control valve is configured to disconnect the second oil circuit when it is powered, the second oil circuit is connected when its power-off.By increasing accumulator and the first control valve in hydraulic steering system, when vehicle powers off suddenly or motor failure can not work, it can be by accumulator to all-hydraulic steering gear fuel feeding, to keep the turning function of vehicle in a short time, to improve drive safety.
Description
Technical field
This disclosure relates to a kind of hydraulic steering system and fork truck.
Background technique
Existing non-rice habitats wheeled vehicle (such as wheel excavator, loading machine, road roller, fork truck and combine harvester
Deng) steering system the characteristics of be motor driven oil pump directly to diverter fuel feeding, motor turns when steering wheel rotation is turned to
It is dynamic, and drive oil pump feed to diverter, realize the function of left and right turn.Because oil pump is to be directly connected to diverter, work as
When vehicle powers off suddenly or motor breaks down suddenly, turning function failure, steering wheel is beaten motionless completely.In practical operation
Certain danger can be brought when if encountering the emergency situations such as power-off.
Utility model content
Purpose of this disclosure is to provide a kind of hydraulic steering system, which can power off suddenly in vehicle or motor hair
The turning function of vehicle is kept in the case where raw failure.
To achieve the goals above, the disclosure provides a kind of hydraulic steering system, and the system comprises fuel tank, motor, oil
Pump, all-hydraulic steering gear, steering cylinder and accumulator, for driving the oil pump to run, the oil pump goes out the motor
Hydraulic fluid port is connected by the first oil circuit with the oil inlet of the all-hydraulic steering gear, the accumulator by the second oil circuit with it is described entirely
The oil inlet of hydraulic steering gear is connected, the first actuator port and the second actuator port of the all-hydraulic steering gear with described turn
It is connected to oil cylinder, the oil return opening of the all-hydraulic steering gear is connected with the fuel tank, is provided with the first control on second oil circuit
Valve processed, first control valve are configured to disconnect second oil circuit when it is powered, and second oil is connected when its power-off
Road.
Optionally, the oil outlet of the oil pump is connected by third oil circuit with the accumulator, is set on first oil circuit
It is equipped with the second control valve, second control valve is configured to disconnect institute when the oil pressure on the third oil circuit is less than oil pressure threshold value
The first oil circuit is stated, first oil circuit is connected when the oil pressure on the third oil circuit is not less than oil pressure threshold value.
Optionally, second control valve is two-position two-way hydraulic control reversal valve.
Optionally, second control valve have the first hydraulic control end and the second hydraulic control end, second control valve it is described
First hydraulic control end is connected with the third oil circuit, and the truck hydraulic steering system further includes third control valve, the third control
Valve processed is two-position three way pilot operated directional control valve, and the oil inlet of the third control valve is connected with the third oil circuit, the third control
The oil return opening of valve processed is connected with the fuel tank, second liquid of the oil outlet of the third control valve and second control valve
It controls end to be connected, the hydraulic control end of the third control valve is connected with the third oil circuit.
Optionally, the hydraulic control end of second control valve is connected with the third oil circuit.
Optionally, the first check valve is provided on the third oil circuit.
Optionally, second one-way valve is provided on first oil circuit.
Optionally, first control valve is two-position two-way electromagnetic directional valve.
Optionally, the oil return opening of the all-hydraulic steering gear is connected by return filter with the fuel tank.
The disclosure also provides a kind of fork truck, and the fork truck includes the hydraulic steering system.
The disclosure the utility model has the advantages that
By increasing accumulator and the first control valve in hydraulic steering system, is powered off suddenly in vehicle or motor occurs
It, can be by accumulator to all-hydraulic steering gear fuel feeding, to keep the steering function of vehicle in a short time when failure can not work
Can, to improve drive safety.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is the schematic diagram of the hydraulic steering system of an embodiment of the present disclosure.
Description of symbols
1 fuel tank, 2 motor
3 oil pump, 4 all-hydraulic steering gear
5 steering cylinder, 6 accumulator
11 first oil circuit, 12 second oil circuit
13 third oil circuit, 121 first control valve
111 second the first hydraulic control of control valve N ends
131 third control valve of the second hydraulic control of M end
132 first check valve, 110 second one-way valve
1000 the first actuator ports of return filter C
101 overflow valve of the second actuator port of D
The oil return opening of the oil inlet B all-hydraulic steering gear of A all-hydraulic steering gear
The oil return opening of the oil inlet F third control valve of E third control valve
The hydraulic control end of the oil outlet H third control valve of G third control valve
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
As shown in Figure 1, the disclosure provides a kind of hydraulic steering system, which includes fuel tank 1, motor 2, oil pump 3, full liquid
Diverter 4, steering cylinder 5 and accumulator 6 are pressed, motor 2 is for driving oil pump 3 to run, oil inlet and 1 phase of fuel tank of oil pump 3
Even, the oil outlet of oil pump 3 is connected by the first oil circuit 11 with the oil inlet A of all-hydraulic steering gear 4, and accumulator 6 passes through the second oil
Road 12 is connected with the oil inlet A of all-hydraulic steering gear 4, the first actuator port C and the second actuator port D of all-hydraulic steering gear 4
It is connected with steering cylinder 5, the oil return opening B of all-hydraulic steering gear 4 is connected with fuel tank 1, is provided with the first control on the second oil circuit 12
Valve 121 processed, the first control valve 121 are configured to disconnect the second oil circuit 12 when it is powered, and the second oil circuit 12 is connected when its power-off.
When vehicle is powered, the first control valve 121 is powered, and the first control valve 121 disconnects the second oil circuit 12, and accumulator 6 can not
To 4 fuel feeding of all-hydraulic steering gear, motor 2, which works, at this time simultaneously drives the oil suction out of fuel tank 1 of oil pump 3, by the first oil circuit 11 to complete
4 fuel feeding of hydraulic steering gear, and by the first actuator port C and the second actuator port D of all-hydraulic steering gear 4 to steering cylinder 5
Fuel feeding realizes the turning function of vehicle；When vehicle powers off suddenly or motor 2 breaks down, motor 2 can not drive oil pump 3
The oil suction and to 4 fuel feeding of all-hydraulic steering gear out of fuel tank 1, the first control valve 121 also powers off at this time, the conducting of the first control valve 121
Second oil circuit 12, accumulator 6 passes through the second oil circuit 12 to 4 fuel feeding of all-hydraulic steering gear, and passes through the first of all-hydraulic steering gear 4
Actuator port C and the second actuator port D fuel feeding into steering cylinder 5, to realize the turning function of short time.Can select compared with
In the case of large-scale accumulator is to realize system cut-off, the turning function of longer time.
Through the above technical solutions, solving, vehicle in the prior art powers off suddenly or vehicle can not carry out when electrical fault
The problem of steering, substantially increases drive safety.
As an alternative embodiment, the oil outlet of oil pump 3 is connected by third oil circuit 13 with accumulator 6, first
The second control valve 111 is provided on oil circuit 11, the second control valve 111 is configured to be less than oil pressure threshold when the oil pressure on third oil circuit 13
The first oil circuit 11 is disconnected when value, and the first oil circuit 11 is connected when the oil pressure on third oil circuit 13 is not less than oil pressure threshold value.
In this case, when vehicle be powered when, the first control valve 121 be powered, the first control valve 121 by accumulator 6 with
The oil inlet A of all-hydraulic steering gear 4 is disconnected, while motor 2 is powered and oil pump 3 is driven to work, at this time the oil pressure on third oil circuit 13
Oil pressure threshold value has not yet been reached, the second control valve 111 disconnects the first oil circuit 11, and oil pump 3 is not possible to through the first oil circuit 11 to complete
4 fuel feeding of hydraulic steering gear, oil pump 3 first passes through the oiling into accumulator 6 of third oil circuit 13, after accumulator 6 fills hydraulic oil,
The oil pressure of third oil circuit 13 can increase, and when increasing to above-mentioned oil pressure threshold value, the second control valve 111 becomes to be connected from off-state
State, oil pump 3 are realized and are turned to again by the first oil circuit 11 to 4 fuel feeding of all-hydraulic steering gear.In actual operation, accumulator 6
Oiling process only need can complete within several seconds, in vehicle launch and motor 2 rotate after several seconds can be by accumulation of energy
Device 6 fills oil, so can't clash with normal steering.Optionally, the second above-mentioned control valve 111 can be two
The pilot operated directional control valve of two-way.
Further, the second control valve 111 has the first hydraulic control end N and the second hydraulic control end M, and the of the second control valve 111
One hydraulic control end N is connected with third oil circuit 13, and truck hydraulic steering system further includes third control valve 131, and third control valve 131 is
The oil inlet E of two-position three way pilot operated directional control valve, third control valve 131 is connected with third oil circuit 13, the oil return of third control valve 131
Mouth F is connected with fuel tank 1, and the oil outlet G of third control valve 131 is connected with the second hydraulic control end M of the second control valve 111, third control
The hydraulic control end H of valve 131 processed is connected with third oil circuit 13.From the above, it can be seen that oil pump 3 first passes through third oil when vehicle is powered
The oiling into accumulator 6 of road 13, after accumulator 6 fills hydraulic oil, oil pump 3 continues to 6 oiling meeting of accumulator so that third is oily
Oil pressure in road 13 increases namely the hydraulic control end H pressure of third control valve 131 can increase, when pressure value is greater than third control valve
When the precompressed force value of the spring of 131 other sides, the state that third control valve 131 is connected from oil inlet E with oil outlet G is (right in figure
Position), become the state (left position in figure) that oil outlet G is connected with oil return opening F, the second hydraulic control end M is connected to fuel tank 1, the second hydraulic control
Pressure of the pressure less than the first hydraulic control end N for holding M, is deposited between the second hydraulic control end M of the second control valve 111 and the first hydraulic control end N
In pressure difference, and then spool moves, and the second control valve 111 is converted on state (figure from off-state (left position in figure)
Middle right position), the first oil circuit 11 forms access at this time, and the hydraulic oil that oil pump 3 exports is supplied to hydro-steering from the first oil circuit 11
Device 4, all-hydraulic steering gear 4 are realized by the first actuator port C and second actuator port D oiling into steering cylinder 5 and turn to function
Energy.
In a kind of optional embodiment, the second control valve 111 can also be with only one hydraulic control end, the hydraulic control end and the
Three oil circuits 13 are connected, without third control valve 131 is arranged.
In addition, being provided with the first check valve 132 on third oil circuit 13, it is provided with second one-way valve 110 on the first oil circuit 11,
To prevent the hydraulic oil in accumulator 6 to be back in oil pump 3.Optionally, the first hydraulic control end N and third of the second control valve 111
The tie point of oil circuit 13 is located at the upstream of the first check valve 132, the hydraulic control end H of third control valve 131 and the company of third oil circuit 13
Contact is located at the downstream of the first check valve 132.
Specifically, the first control valve 121 can be two-position two-way electromagnetic directional valve, when vehicle power-off, the first control valve
121 are in off-position, and the first control valve 121 is connected, and accumulator 6 is real to all-hydraulic steering gear 4 by 12 fuel feeding of the second oil circuit
Turn now to function, when vehicle be powered when, the first control valve 121 be in obtain electricity condition, the first control valve 121 disconnect, accumulator 6 with
Disconnect between all-hydraulic steering gear 4, turning function is realized to 4 fuel feeding of all-hydraulic steering gear by the first oil circuit 11 from oil pump 3.
As another optional embodiment, the oil return opening B of all-hydraulic steering gear 4 passes through return filter 1000 and oil
Case 1 is connected, and overflow valve 101 is provided in all-hydraulic steering gear 4, is prevented in the excessively high damage of hydraulic pressure value in all-hydraulic steering gear 4
Portion's structure, and return filter 1000 can filter out the various dirts such as generated abrasive grain during the work time of all kinds of Hydraulic Elements
Object avoids being back in fuel tank 1, pollutes entire hydraulic system.
The disclosure also provides a kind of fork truck, which includes above-mentioned hydraulic steering system, but above-mentioned fluid-link steering system
System is not limited in can be used for such as wheel excavator, loading machine, road roller, fork truck and combining for fork truck
The non-rice habitats wheeled vehicle such as machine.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (10)
1. a kind of hydraulic steering system, which is characterized in that the system comprises fuel tanks (1), motor (2), oil pump (3), all-hydraulic
Diverter (4), steering cylinder (5) and accumulator (6), the motor (2) is for driving the oil pump (3) to run, the oil
The oil outlet of pump (3) is connected by the first oil circuit (11) with the oil inlet (A) of the all-hydraulic steering gear (4), the accumulator
(6) it is connected by the second oil circuit (12) with the oil inlet (A) of the all-hydraulic steering gear (4), the all-hydraulic steering gear (4)
First actuator port (C) and the second actuator port (D) are connected with the steering cylinder (5), the all-hydraulic steering gear (4)
Oil return opening (B) is connected with the fuel tank (1), is provided with the first control valve (121) on second oil circuit (12), first control
Valve (121) processed is configured to disconnect second oil circuit (12) when it is powered, and second oil circuit (12) is connected when its power-off.
2. hydraulic steering system according to claim 1, which is characterized in that the oil outlet of the oil pump (3) passes through third
Oil circuit (13) is connected with the accumulator (6), is provided with the second control valve (111) on first oil circuit (11), described second
Control valve (111) is configured to disconnect first oil circuit when the oil pressure on the third oil circuit (13) is less than oil pressure threshold value
(11), first oil circuit (11) is connected when the oil pressure on the third oil circuit (13) is not less than oil pressure threshold value.
3. hydraulic steering system according to claim 2, which is characterized in that second control valve (111) is two two
Logical pilot operated directional control valve.
4. hydraulic steering system according to claim 3, which is characterized in that second control valve (111) has first
Hydraulic control end (N) and the second hydraulic control end (M), first hydraulic control end (N) of second control valve (111) and the third oil circuit
(13) it is connected, the hydraulic steering system further includes third control valve (131), and the third control valve (131) is two-position three way
Pilot operated directional control valve, the oil inlet (E) of the third control valve (131) are connected with the third oil circuit (13), the third control
The oil return opening (F) of valve (131) is connected with the fuel tank (1), the oil outlet (G) and described second of the third control valve (131)
Second hydraulic control end (M) of control valve (111) is connected, the hydraulic control end (H) of the third control valve (131) and third oil
Road (13) is connected.
5. hydraulic steering system according to claim 3, which is characterized in that the hydraulic control end of second control valve (111)
It is connected with the third oil circuit (13).
6. hydraulic steering system according to claim 2, which is characterized in that be provided with first on the third oil circuit (13)
Check valve (132).
7. hydraulic steering system according to claim 1, which is characterized in that be provided with second on first oil circuit (11)
Check valve (110).
8. hydraulic steering system according to claim 1, which is characterized in that first control valve (121) is two two
Electric change valve.
9. hydraulic steering system according to claim 1, which is characterized in that the oil return opening of the all-hydraulic steering gear (4)
(B) it is connected by return filter (1000) with the fuel tank (1).
10. a kind of fork truck, which is characterized in that the fork truck includes hydraulic rotation described in any one of the claims 1-9
To system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821779868.6U CN209242610U (en) | 2018-10-30 | 2018-10-30 | Hydraulic steering system and fork truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821779868.6U CN209242610U (en) | 2018-10-30 | 2018-10-30 | Hydraulic steering system and fork truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209242610U true CN209242610U (en) | 2019-08-13 |
Family
ID=67526514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821779868.6U Active CN209242610U (en) | 2018-10-30 | 2018-10-30 | Hydraulic steering system and fork truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209242610U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113942574A (en) * | 2021-11-04 | 2022-01-18 | 湖北三江航天万山特种车辆有限公司 | Centering system and vehicle |
-
2018
- 2018-10-30 CN CN201821779868.6U patent/CN209242610U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113942574A (en) * | 2021-11-04 | 2022-01-18 | 湖北三江航天万山特种车辆有限公司 | Centering system and vehicle |
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