CN217294650U - Emergency compensation loop of vehicle hydraulic steering system - Google Patents
Emergency compensation loop of vehicle hydraulic steering system Download PDFInfo
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- CN217294650U CN217294650U CN202221344974.8U CN202221344974U CN217294650U CN 217294650 U CN217294650 U CN 217294650U CN 202221344974 U CN202221344974 U CN 202221344974U CN 217294650 U CN217294650 U CN 217294650U
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Abstract
The utility model discloses an emergency compensation loop of a vehicle hydraulic steering system, which is provided with an emergency steering pump and a two-position three-way hydraulic valve; the emergency steering pump output end is connected with a bypass pipeline, the bypass pipeline leads to the flow amplifier, the two-position three-way hydraulic valve is arranged on the bypass pipeline, the power end of the two-position three-way hydraulic valve is connected with the main pipeline of the main hydraulic loop of the vehicle hydraulic steering system, and a spring is arranged on one side opposite to the power end. The utility model discloses an emergency loop that sets up on main hydraulic circuit's next door. When the pressure of the main hydraulic circuit is insufficient, the auxiliary work is carried out, so that the emergency steering of the oil supply capacity of the system is ensured.
Description
Technical Field
The utility model relates to a vehicle steering system especially is about a large-scale haulage vehicle hydraulic steering system's emergent supplementary return circuit, realizes emergent function of turning to.
Background
Hydraulic steering systems and electric steering systems are common in vehicle steering systems. For hydraulic steering, an engine drives a steering pump, after a steering wheel steers, the steering pump is driven by the engine to pump oil to a steering oil cylinder by the engine according to the steering requirement, and the steering oil cylinder stretches and drives the steering mechanism to act to drive the left front wheel and the right front wheel to steer; the same principle applies to electric power steering.
However, no matter which steering system is equipped, only one conventional steering system is provided, and no standby system is provided, so that driving hazards can be caused in emergency situations. For a hydraulic steering system, once an engine idles or a steering pump is broken, steering cannot be realized; in the case of electric steering, if the electric power is insufficient or the steering pump is broken, the steering cannot be performed.
In addition, for large vehicles, the front axle load is large, and the steering power needs to be supplemented under the condition that the conventional steering system cannot meet the steering power.
SUMMERY OF THE UTILITY MODEL
To not enough among the prior art, the utility model provides a vehicle hydraulic steering system's emergent compensating circuit, this return circuit is used for emergent supply when main hydraulic circuit is not enough for the steering cylinder fuel feeding as main hydraulic circuit's compensation, has solved the problem of emergent turning to when conventional steering power is not enough (or became invalid), guarantees turning to safety of vehicle.
The technical scheme of the utility model as follows: an emergency compensation loop of a vehicle hydraulic steering system is provided with an emergency steering pump and a two-position three-way hydraulic valve;
the emergency steering pump is supplied with oil by an oil tank, the output end of the emergency steering pump is connected with a bypass pipeline, the bypass pipeline is communicated with a flow amplifier, the bypass pipeline is provided with the two-position three-way hydraulic valve, an oil inlet and a working oil port of the two-position three-way hydraulic valve are communicated with the bypass pipeline, and an oil return port is connected to the oil tank;
and the power end of the two-position three-way hydraulic valve is connected to a main pipeline of a main hydraulic loop of a vehicle hydraulic steering system, and a spring is arranged on one side, opposite to the power end, of the two-position three-way hydraulic valve.
Further, the emergency steering pump is a fixed displacement pump.
Furthermore, a first one-way valve is arranged on a bypass pipeline behind the two-position three-way hydraulic valve, and the first one-way valve is communicated in the direction from the emergency steering pump to the flow amplifier.
Furthermore, the main hydraulic circuit is provided with a main steering pump, the output end of the main steering pump is connected with a main pipeline, and a branch pipeline is branched from the main pipeline and is connected to the power end of the two-position three-way hydraulic valve.
Further, a second one-way valve is arranged on the main pipeline and communicated in the direction from the main steering pump to the flow amplifier.
Further, the main pipeline and the bypass pipeline are merged to a flow amplifier after the second one-way valve.
Compared with the prior art, the utility model discloses a to conventional a steering system's replenishment, add emergent compensating circuit on conventional hydraulic pressure turns to the return circuit basis, emergent compensating circuit sets up an emergent steering pump, a two-position three way hydraulic valve is connected to emergent steering pump's output, this valve is by the pressure control of main hydraulic circuit, when main hydraulic circuit oil pressure is not enough, two-position three way hydraulic valve is in the on-state, makes the oil in the oil tank go into flow amplifier through emergent steering pump, gives the steering cylinder and uses. The emergency compensation circuit is used for assisting, when the oil supply pressure of the main hydraulic circuit is insufficient, the emergency compensation circuit can participate in working to guarantee the oil supply capacity of the system, and by means of the design, the main pump can be protected, the normal work of the steering system can be guaranteed, and the conventional steering failure is prevented.
Drawings
Fig. 1 is a schematic diagram of the hydraulic steering system of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples, which together with the embodiments of the present invention are used to explain the technical solutions of the present invention, but those skilled in the art should understand that the examples are not the only limitations to the technical solutions of the present invention, and all equivalent changes or modifications made in the spirit of the technical solutions of the present invention should be considered as belonging to the protection scope of the present invention.
As shown in FIG. 1, the utility model provides an emergent compensating circuit of vehicle hydraulic steering system sets up the bypass at main hydraulic circuit. The compensation loop is mainly provided with an emergency steering pump 1, a two-position three-way hydraulic valve 2 and a first one-way valve 3.
The emergency steering pump 1 is selected as a fixed displacement pump, and further is a plunger type fixed displacement pump. The emergency steering pump 1 is directly supplied with oil by an oil tank, a bypass pipeline G is connected to the output end of the emergency steering pump 1, and the bypass pipeline G leads to the flow amplifier 6. A two-position three-way hydraulic valve 2 is arranged on the bypass pipeline G, the two-position three-way hydraulic valve 2 comprises an oil inlet and two oil outlets, and the oil inlet P is communicated with the output end of the emergency steering pump 1; the first oil outlet is a working oil port A and is connected to the flow amplifier 6; the second oil outlet is an oil return port B and is connected to an oil tank. When the oil inlet P is communicated with the working oil port A, the hydraulic valve works at an oil supply working position, and the emergency steering pump can supply oil to the flow amplifier 6; when the oil inlet P and the oil return port B are communicated, the hydraulic valve works at an oil return working position, oil pumped out by the emergency steering pump flows back to the oil tank, and the pump idles at the moment.
The emergency steering pump 1 can supply oil to the flow amplifier 6, and the flow amplifier 6 cannot return oil to the emergency steering pump 1 when the two-position three-way hydraulic valve 2 is in an oil supply working position.
The two conducting positions of the two-position three-way hydraulic valve 2 are switched under the pressure control of a main hydraulic circuit. The main hydraulic circuit is provided with a main steering pump 4, the output end of the main steering pump 4 is connected with a main pipeline G1, a branch pipeline G is branched from the main pipeline G1 and is connected to the power end of the two-position three-way hydraulic valve 2, and hydraulic oil pumped out by the main steering pump 4 exerts certain pressure on the power end of the hydraulic valve.
A spring is arranged on one side, opposite to the power end, of the two-position three-way hydraulic valve 2, when the pressure on the power end of the hydraulic valve is enough, the spring is pressed, so that an oil inlet P of the hydraulic valve is communicated with an oil return port B, oil pumped out by the emergency steering pump 1 flows back to an oil tank, and the emergency steering pump 1 does not work in an idle running mode; when the pressure on the power end of the hydraulic valve is not enough or is not enough, the spring returns, so that the oil inlet P of the valve is communicated with the working oil port A, the oil pumped out by the emergency steering pump flows to the flow amplifier 6, and the emergency steering pump 1 works. Therefore, the emergency compensation circuit works under the influence of the hydraulic pressure of the main hydraulic circuit in real time and works when the emergency compensation is needed.
Further, a second check valve 5 is provided in a main line G1 of the main steering pump 4, and the second check valve 5 is opened in the main hydraulic circuit oil supply direction to prevent the flow rate amplifier 6 from flowing back.
Furthermore, the two pipelines of the main pipeline G1 and the bypass pipeline G are merged to the flow amplifier 6, and the merged node is arranged on the pipeline at the output end of the first check valve 3 and the second check valve 5, so that the oil in the bypass pipeline G can enter the flow amplifier 6 without passing through the two check valves of the first check valve 3 and the second check valve 5.
Further, the main steering pump 4 is a variable displacement pump, and the displacement of the pump is adjusted by the command of the steering gear.
The flow amplifier 6 supplies oil to the steering oil cylinder 7 through the valve group step by step according to the flow amplification requirement of the steering gear, and the steering oil cylinder 7 is a double-linkage steering oil cylinder.
Therefore, to the utility model discloses, emergent compensating circuit is controlled by main hydraulic circuit, and when main steering pump 4 fuel feeding pressure was enough, emergent steering pump 1 can not participate in work, when main steering pump 4 fuel feeding pressure was not enough, emergent steering pump 1 just can participate in work to guarantee system's fuel feeding ability, when main steering pump 4 reached fuel feeding pressure once more, emergent steering pump 1 withdraws from work again. The utility model discloses a this kind of design both can protect main steering pump 4, can guarantee again that a steering system can normally work, and the priority of work lies in main steering pump 4, and emergent steering pump 1 just intervenes work when main steering pump 4 fuel feeding ability is not enough, and emergent steering pump 1 is waiting to be worked the state always, only just starts when needing, prevents that the vehicle from turning to inefficacy.
The emergency compensation loop has the advantages of simple structure and simple principle, is suitable for engineering machinery vehicles, can be a full-hydraulic steering rodless system, and the turning diameter of the vehicle is completely dependent on the corner of a front axle.
Claims (6)
1. An emergency compensation circuit of a hydraulic steering system of a vehicle, characterized in that: the emergency compensation loop is provided with an emergency steering pump (1) and a two-position three-way hydraulic valve (2);
the emergency steering pump (1) is supplied with oil by an oil tank, the output end of the emergency steering pump is connected with a bypass pipeline (G), the bypass pipeline (G) leads to a flow amplifier (6), the bypass pipeline (G) is provided with the two-position three-way hydraulic valve (2), an oil inlet (P) and a working oil port (A) of the two-position three-way hydraulic valve (2) penetrate through the bypass pipeline (G), and an oil return port (B) is connected to the oil tank;
the power end of the two-position three-way hydraulic valve (2) is connected to a main pipeline (G1) of a main hydraulic loop of the vehicle hydraulic steering system, and a spring is arranged on one side, opposite to the power end, of the two-position three-way hydraulic valve (2).
2. The emergency compensation circuit of a hydraulic steering system for a vehicle according to claim 1, wherein: the emergency steering pump (1) is a fixed displacement pump.
3. The emergency compensation circuit of a hydraulic steering system for a vehicle according to claim 1, wherein: and a first one-way valve (3) is arranged on a bypass pipe (G) behind the two-position three-way hydraulic valve (2), and the first one-way valve (3) is communicated in the direction from the emergency steering pump (1) to the flow amplifier (6).
4. The emergency compensation circuit of a hydraulic steering system for a vehicle according to claim 1, wherein: the hydraulic control system is characterized in that the main hydraulic loop is provided with a main steering pump (4), the output end of the main steering pump (4) is connected with a main pipeline (G1), and a branch pipeline (G) is branched from the main pipeline (G1) and is connected to the power end of the two-position three-way hydraulic valve (2).
5. The emergency compensation circuit of a hydraulic steering system for a vehicle according to claim 4, wherein: the main pipeline (G1) is provided with a second one-way valve (5), and the second one-way valve (5) is communicated in the direction from the main steering pump (4) to the flow amplifier (6).
6. The emergency compensation circuit of a hydraulic steering system for a vehicle according to claim 5, wherein: the main line (G1) and the bypass line (G) merge after the second non-return valve (5) to a flow amplifier (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221344974.8U CN217294650U (en) | 2022-05-30 | 2022-05-30 | Emergency compensation loop of vehicle hydraulic steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221344974.8U CN217294650U (en) | 2022-05-30 | 2022-05-30 | Emergency compensation loop of vehicle hydraulic steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217294650U true CN217294650U (en) | 2022-08-26 |
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ID=82918450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221344974.8U Active CN217294650U (en) | 2022-05-30 | 2022-05-30 | Emergency compensation loop of vehicle hydraulic steering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217294650U (en) |
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2022
- 2022-05-30 CN CN202221344974.8U patent/CN217294650U/en active Active
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