CN219339552U - Hydraulic steering system and articulated dump truck - Google Patents
Hydraulic steering system and articulated dump truck Download PDFInfo
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- CN219339552U CN219339552U CN202223479486.0U CN202223479486U CN219339552U CN 219339552 U CN219339552 U CN 219339552U CN 202223479486 U CN202223479486 U CN 202223479486U CN 219339552 U CN219339552 U CN 219339552U
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Abstract
The utility model belongs to the technical field of hydraulic steering, and discloses a hydraulic steering system and an articulated dump truck. The hydraulic steering system comprises a pump, a flow amplifying valve, a first steering oil cylinder, a second steering oil cylinder, a first limiting valve, a second limiting valve, a steering control valve and a hydraulic oil tank. The oil outlet of the pump is communicated with the oil inlet of the flow amplifying valve, the first oil outlet of the flow amplifying valve is simultaneously communicated with the rodless cavity of the first steering cylinder and the rod cavity of the second steering cylinder, the second oil outlet of the flow amplifying valve is simultaneously communicated with the rodless cavity of the second steering cylinder and the rod cavity of the first steering cylinder, the first oil outlet of the steering control valve is communicated with the first pilot control cavity of the flow amplifying valve through the first limiting valve, the second oil outlet of the steering control valve is communicated with the second pilot control cavity of the flow amplifying valve through the second limiting valve, and the first limiting valve and the second limiting valve are in butt joint through a mechanical structure to realize reversing. The hydraulic steering system is simple in structure and low in cost.
Description
Technical Field
The utility model relates to the technical field of hydraulic steering, in particular to a hydraulic steering system and an articulated dump truck.
Background
The articulated dumper is an earthwork transport machine with strong universality, is particularly suitable for working environments of muddy and complex terrains, and therefore, steering capacity is an important index for measuring the performance of the articulated dumper.
In the prior art, patent document CN104029772B discloses a hydraulic steering system of engineering machinery, as shown in fig. 2, the hydraulic steering system comprises a control part and a driving part, the control part comprises a steering gear 5, the driving part comprises a first steering cylinder 1-1, a second steering cylinder 1-2 and a steering pump 3, the oil outlet of the steering pump 3 is communicated with the oil inlet of a flow amplifying valve 2 and the oil inlet of a pressure reducing valve 4, the first oil outlet of the flow amplifying valve 2 is communicated with the oil inlet of the second steering cylinder 1-2 and the oil outlet of the first steering cylinder 1-1, the second oil outlet of the flow amplifying valve 2 is communicated with the oil inlet of the first steering cylinder 1-1 and the oil outlet of the second steering cylinder 1-2, the oil outlet of the pressure reducing valve 4 is communicated with the third oil inlet of a motor steering valve 6 and the oil inlet of the steering gear 5, the first oil outlet of the steering gear 5 is communicated with the oil inlet of a second hydraulic steering valve 9, the first oil outlet of the second hydraulic steering valve 9 is communicated with the first hydraulic control port of a main valve 2, the second oil outlet of the steering valve 5 is communicated with the first oil outlet of the first hydraulic control valve 8 is communicated with the main valve 8; the hydraulic control port of the first hydraulic control reversing valve 8 is communicated with the second oil port of the motor-driven reversing valve 6, the hydraulic control port of the second hydraulic control reversing valve 9 is communicated with the first oil port of the motor-driven reversing valve 6, and the fourth oil port of the motor-driven reversing valve 6, the second oil outlet of the first hydraulic control reversing valve 8, the control port of the first hydraulic control reversing valve 8, the second oil outlet of the second hydraulic control reversing valve 9, the control port of the second hydraulic control reversing valve 9 and the third oil outlet of the steering gear 5 are respectively communicated with an oil tank; the motor-driven reversing valve 6 is arranged on a rear frame of the engineering machinery, limiting blocks 7 are arranged on the front frame and correspond to two sides of the motor-driven reversing valve 6, when the steering gear 5 rotates left or right, the motor-driven reversing valve 6 is abutted to the left or right limiting blocks 7, the motor-driven reversing valve 6 reverses to control the first hydraulic control reversing valve 8 or the second hydraulic control reversing valve 9 to reverse and cut off an oil way, hydraulic oil at the control end of a main valve core is unloaded, the main valve core of the flow amplifying valve 2 returns to the middle position, the steering oil cylinder stops moving, and limiting of a steering system is achieved. The structure realizes steering limit, but is complex in structure and unfavorable for reducing cost.
Disclosure of Invention
The utility model aims to provide a hydraulic steering system and an articulated dump truck, which have simple structure and lower cost.
To achieve the purpose, the utility model adopts the following technical scheme:
the hydraulic steering system comprises a pump, a flow amplifying valve, a first steering cylinder, a second steering cylinder, a first limiting valve, a second limiting valve, a steering control valve and a hydraulic oil tank, wherein an oil inlet of the pump is communicated with the hydraulic oil tank, an oil outlet of the pump is communicated with an oil inlet of the flow amplifying valve, a first oil outlet of the flow amplifying valve is simultaneously communicated with a rodless cavity of the first steering cylinder and a rod cavity of the second steering cylinder, a second oil outlet of the flow amplifying valve is simultaneously communicated with a rodless cavity of the second steering cylinder and a rod cavity of the first steering cylinder, an oil inlet of the steering control valve is communicated with an oil outlet of the pump, a first oil outlet of the steering control valve is communicated with a first pilot control cavity of the flow amplifying valve through the first limiting valve, a second oil outlet of the steering control valve is simultaneously communicated with a second control cavity of the flow amplifying valve through the second limiting valve, and the first limiting valve and the second limiting valve are mechanical stroke limiting valves.
As an alternative, the pump includes a main pump and a pilot pump, an oil outlet of the main pump is communicated with an oil inlet of the flow amplifying valve, and an oil outlet of the pilot pump is communicated with an oil inlet of the steering control valve through a pilot oil inlet path.
As an alternative, the pilot oil inlet is provided with a filter.
As an alternative, a first pilot oil return path is arranged between the pilot oil inlet path and the hydraulic oil tank, and a first overflow valve is arranged on the first pilot oil return path.
As an alternative, the pilot oil inlet is provided with an accumulator.
As an alternative, the pilot oil inlet passage is provided with a pressure reducing valve.
As an alternative scheme, the flow amplifying valve comprises a priority valve and a hydraulic control reversing valve, wherein an oil inlet of the priority valve is communicated with an oil outlet of the main pump, a first oil outlet of the priority valve is connected with other working mechanisms of the hinged dumper, a second oil outlet of the priority valve is communicated with an oil inlet of the hydraulic control reversing valve, a first oil outlet of the hydraulic control reversing valve is simultaneously communicated with a rodless cavity of the first steering cylinder and a rod cavity of the second steering cylinder, a second oil outlet of the hydraulic control reversing valve is simultaneously communicated with a rodless cavity of the second steering cylinder and a rod cavity of the first steering cylinder, a first oil outlet of the steering control valve is communicated with the first pilot control cavity of the hydraulic control reversing valve through the first limiting valve, and a second oil outlet of the steering control valve is communicated with the second pilot control cavity of the hydraulic control reversing valve through the second limiting valve.
As an alternative scheme, the flow amplifying valve further comprises a second overflow valve and a third overflow valve, wherein an oil inlet of the second overflow valve is simultaneously communicated with a rodless cavity of the first steering cylinder and a rod cavity of the second steering cylinder, an oil inlet of the third overflow valve is simultaneously communicated with the rodless cavity of the second steering cylinder and the rod cavity of the first steering cylinder, and an oil outlet of the second overflow valve and an oil outlet of the third overflow valve are both communicated with the hydraulic oil tank.
As an alternative, the flow amplifying valve further includes a first check valve and a second check valve, the first check valve is in unidirectional conduction in a direction from the hydraulic oil tank to the rodless cavity of the first steering cylinder and the rod-containing cavity of the second steering cylinder, and the second check valve is in unidirectional conduction in a direction from the hydraulic oil tank to the rodless cavity of the second steering cylinder and the rod-containing cavity of the first steering cylinder.
An articulated dump truck comprising a hydraulic steering system according to any one of the above aspects.
The utility model has the beneficial effects that:
the utility model provides a hydraulic steering system which comprises a pump, a flow amplifying valve, a first steering oil cylinder, a second steering oil cylinder, a first limiting valve, a second limiting valve, a steering control valve and a hydraulic oil tank. Wherein the oil inlet of the pump is communicated with the hydraulic oil tank, the oil outlet of the pump is communicated with the oil inlet of the flow amplifying valve, the first oil outlet of the flow amplifying valve is simultaneously communicated with the rodless cavity of the first steering oil cylinder and the rod cavity of the second steering oil cylinder, the second oil outlet of the flow amplifying valve is simultaneously communicated with the rodless cavity of the second steering oil cylinder and the rod cavity of the first steering oil cylinder, the oil inlet of the steering control valve is communicated with the oil outlet of the pump, the first oil outlet of the steering control valve is communicated with the first pilot control cavity of the flow amplifying valve through the first limiting valve, the second oil outlet of the steering control valve is communicated with the second pilot control cavity of the flow amplifying valve through the second limiting valve, the first limiting valve and the second limiting valve are mechanical travel limiting valves, when left steering is performed, hydraulic oil enters the first pilot control cavity of the flow amplifying valve through the first limiting valve, the flow amplifying valve is pushed to change direction, so that the pump can enable hydraulic oil to enter a rodless cavity of the first steering cylinder and a rod cavity of the second steering cylinder through a first oil outlet of the flow amplifying valve, an output rod of the first steering cylinder stretches out, an output rod of the second steering cylinder withdraws, wheels of the hinged dumper rotate left, when the wheels rotate to a set limit position, the valve rod of the first limiting valve is touched and pushed to act so as to cut off an oil path of the first limiting valve, the flow amplifying valve returns to a neutral position state under the acting force of a spring of the flow amplifying valve, the pump cannot enable hydraulic oil to enter the rodless cavity of the first steering cylinder and the rod cavity of the second steering cylinder through the flow amplifying valve, the first steering cylinder and the second steering cylinder stop acting, the wheels stop steering, and the right steering principle is the same as that of left steering. The hydraulic steering system is arranged as the mechanical travel limiting valve through the first limiting valve and the second limiting valve, and when steering, the valve rod of the first limiting valve or the second limiting valve is touched through a mechanical structure to realize steering, so that steering limiting is realized through the steering of the first hydraulic control steering valve or the second hydraulic control steering valve without a motor steering valve in the prior art, the structural design is simplified, and the cost is reduced.
Drawings
FIG. 1 is a schematic illustration of a hydraulic steering system provided by an embodiment of the present utility model;
fig. 2 is a diagram of a prior art hydraulic steering system.
In the figure:
10. a flow amplifying valve; 11. a priority valve; 12. a hydraulically controlled reversing valve; 13. a second overflow valve; 14. a third overflow valve; 15. a first one-way valve; 16. a second one-way valve; 20. a first steering cylinder; 30. a second steering cylinder; 40. a first limit valve; 50. a second limit valve; 60. a steering control valve; 70. a hydraulic oil tank; 81. a main pump; 82. a pilot pump; 821. a pilot oil inlet path; 8211. a filter; 8212. an accumulator; 8213. a pressure reducing valve; 8214. a third one-way valve; 822. a first pilot oil return path; 8221. a first overflow valve; 823. the second pilot oil return path;
1-1, a first steering cylinder; 1-2, a second steering cylinder; 2. a flow amplifying valve; 3. a steering pump; 4. a pressure reducing valve; 5. a diverter; 6. a motorized reversing valve; 7. a limiting block; 8. a first hydraulically controlled reversing valve; 9. and a second pilot operated directional valve.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be interpreted broadly, as for example, they may be fixedly connected, or may be detachably connected, or may be electrically connected, or may be directly connected, or may be indirectly connected through an intermediary, or may be in communication with one another in two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present utility model provides a hydraulic steering system including a pump, a flow amplifying valve 10, a first steering cylinder 20, a second steering cylinder 30, a first limit valve 40, a second limit valve 50, a steering control valve 60, and a hydraulic tank 70. The oil inlet of the pump is communicated with the hydraulic oil tank 70, the oil outlet of the pump is communicated with the oil inlet of the flow amplifying valve 10, the first oil outlet of the flow amplifying valve 10 is simultaneously communicated with the rodless cavity of the first steering oil cylinder 20 and the rod cavity of the second steering oil cylinder 30, the second oil outlet of the flow amplifying valve 10 is simultaneously communicated with the rodless cavity of the second steering oil cylinder 30 and the rod cavity of the first steering oil cylinder 20, the oil inlet of the steering control valve 60 is communicated with the oil outlet of the pump, the first oil outlet of the steering control valve 60 is communicated with the first pilot control cavity of the flow amplifying valve 10 through the first limiting valve 40, the second oil outlet of the steering control valve 60 is communicated with the second pilot control cavity of the flow amplifying valve 10 through the second limiting valve 50, and the third oil outlet of the steering control valve 60 is communicated with the hydraulic oil tank 70 through the second pilot oil return path 823. And the first limit valve 40 and the second limit valve 50 are mechanical travel limit valves. When the hinged dumper is in straight running and not in steering, the oil inlet of the steering control valve 60 is communicated with the third oil outlet of the steering control valve 60, and the first steering oil cylinder 20 and the second steering oil cylinder 30 are not in action; when the articulated dump truck turns left, the oil inlet of the steering control valve 60 is communicated with the first oil outlet of the steering control valve 60, the pump pumps hydraulic oil in the hydraulic oil tank 70 into the first pilot control cavity of the flow amplifying valve 10 through the steering control valve 60 and then through the first limiting valve 40, the flow amplifying valve 10 reverses to realize that the oil outlet of the pump is communicated with the B path, and the pump enters hydraulic oil into the rodless cavity of the first steering oil cylinder 20 and the rod-containing cavity of the second steering oil cylinder 30 through the B path so as to realize that the output rod of the first steering oil cylinder 20 extends out and the output rod of the second steering oil cylinder 30 retracts, and the wheels of the articulated dump truck turn left together through the extension of the output rod of the first steering oil cylinder 20 and the retraction of the output rod of the second steering oil cylinder 30; when the wheels rotate to the set limit position, the mechanical mechanism on the hinged dumper touches the valve rod of the first limit valve 40 and pushes the valve rod to act so as to realize the reversing of the first limit valve 40, so that an oil way is cut off, at the moment, the flow amplifying valve 10 returns to a neutral position state under the acting force of the self spring, the pump cannot stop acting of hydraulic oil in the hydraulic oil tank 70 through the flow amplifying valve 10, and the first steering oil cylinder 20 and the second steering oil cylinder 30 so as to realize the left-turn limit; similarly, when the articulated dump truck turns right, the action principle is the same as that of the left turning, and the description is omitted here.
According to the hydraulic steering system, the first limit valve 40 and the second limit valve 50 are arranged as mechanical travel limit valves, when steering is performed, the valve rod of the first limit valve 40 or the second limit valve 50 is touched through a mechanical structure to realize reversing, so that a driver can obviously feel a terminal point when the steering wheel reaches a limit position, the hydraulic steering system cannot continue to rotate in the same direction, the steering limit is realized without the need of realizing the reversing of the first hydraulic control reversing valve 8 or the second hydraulic control reversing valve 9 through the motor reversing valve 6 in the prior art, the structural design is simplified, and the cost is reduced.
The pump comprises a main pump 81 and a pilot pump 82, wherein an oil outlet of the main pump 81 is communicated with an oil inlet of the flow amplifying valve 10 and is used for providing power for the first steering cylinder 20 and the second steering cylinder 30; an oil outlet of the pilot pump 82 is communicated with an oil inlet of the steering control valve 60 through a pilot oil inlet passage 821 for supplying power to the control flow amplifying valve 10. In the structure, the pilot pump 82 is arranged, the working pressure is low, and the reliability and the service life of the steering gear can be improved by controlling the flow amplifying valve 10 through low pressure; and when no steering is performed and no other working mechanism is working, the main pump 81 can be unloaded, and the steering pump 3 needs to always maintain a certain working pressure when one steering pump 3 is not required as in the prior art.
In order to prevent impurities in the hydraulic oil tank 70 from entering the steering control valve 60, the pilot oil inlet passage 821 is provided with a filter 8211, and when the pilot pump 82 pumps the hydraulic oil in the hydraulic oil tank 70 into the steering control valve 60, the hydraulic oil needs to be filtered through the filter 8211 to ensure the cleanness of the hydraulic oil.
The pilot oil inlet passage 821 is further provided with a third check valve 8214, and the third check valve 8214 is disposed between the outlet end of the filter 8211 and the oil inlet of the steering control valve 60 for preventing the hydraulic oil from flowing back.
A first pilot oil return path 822 is arranged between the pilot oil inlet path 821 and the hydraulic oil tank 70, the first pilot oil return path 822 is provided with a first overflow valve 8221, and when the pilot oil inlet path 821 is blocked, the pilot pump 82 directly returns hydraulic oil to the hydraulic oil tank 70 through the first overflow valve 8221, so that the safety protection function is achieved.
The pilot oil inlet passage 821 is further provided with an accumulator 8212, and the accumulator 8212 can provide emergency power for the articulated dump truck after the articulated dump truck is stopped.
The pilot oil inlet passage 821 is further provided with a pressure reducing valve 8213, and the pilot pump 82 passes through the filter 8211 and the third check valve 8214 to allow the hydraulic oil in the hydraulic oil tank 70 to enter the steering control valve 60 through the pressure reducing valve 8213, whereby the pressure reducing valve 8213 can provide a stable control pressure.
With continued reference to fig. 1, the flow amplifying valve 10 includes a priority valve 11 and a pilot operated directional valve 12, where an oil inlet of the priority valve 11 is communicated with an oil outlet of the main pump 81, a first oil outlet of the priority valve 11 is connected with other working mechanisms, and when the articulated dump truck is not turning, the main pump 81 can output from the first oil outlet through the priority valve 11 to provide power for the other working mechanisms; the second oil outlet of the priority valve 11 is communicated with the oil inlet of the hydraulic control reversing valve 12, the first oil outlet of the hydraulic control reversing valve 12 is simultaneously communicated with the rodless cavity of the first steering cylinder 20 and the rod cavity of the second steering cylinder 30, the second oil outlet of the hydraulic control reversing valve 12 is simultaneously communicated with the rodless cavity of the second steering cylinder 30 and the rod cavity of the first steering cylinder 20, the first oil outlet of the steering control valve 60 is communicated with the first pilot control cavity of the hydraulic control reversing valve 12 through the first limiting valve 40, and the second oil outlet of the steering control valve 60 is communicated with the second pilot control cavity of the hydraulic control reversing valve 12 through the second limiting valve 50. The flow amplifying valve 10 can ensure that the main pump 81 makes the hydraulic oil in the hydraulic oil tank 70 pass through the priority valve 11 to reach the first steering cylinder 20 and the second steering cylinder 30 by the pilot operated directional valve 12 when the articulated dump truck turns.
The flow amplifying valve 10 further comprises a second relief valve 13 and a third relief valve 14. The oil inlet of the second overflow valve 13 is simultaneously communicated with the rodless cavity of the first steering cylinder 20 and the rod cavity of the second steering cylinder 30 (i.e. communicated with the path B), the oil outlet of the second overflow valve 13 is communicated with the hydraulic oil tank 70, and when the first steering cylinder 20 of the hinged dump truck is retracted inwards by an external force output rod, the hydraulic oil of the first steering cylinder 20 flows back to the hydraulic oil tank 70 through the second overflow valve 13; the oil inlet of the third relief valve 14 is simultaneously communicated with the rodless cavity of the second steering cylinder 30 and the rod cavity of the first steering cylinder 20 (i.e. communicated with the path a), the oil outlet of the third relief valve 14 is communicated with the hydraulic oil tank 70, and when the second steering cylinder 30 of the articulated dump truck is retracted inwards by the external force output rod, the hydraulic oil of the second steering cylinder 30 flows back to the hydraulic oil tank 70 through the third relief valve 14. The structure can limit the maximum pressure of the system and ensure the safety of the system.
The flow amplifying valve 10 further comprises a first check valve 15 and a second check valve 16. The first check valve 15 is connected between the path B and the hydraulic oil tank 70, the first check valve 15 is in unidirectional conduction in the direction from the hydraulic oil tank 70 to the path B, and when the output rod of the first steering cylinder 20 is extended outwards by external force, hydraulic oil in the hydraulic oil tank 70 can enter the rodless cavity of the first steering cylinder 20 through the first check valve 15; the second check valve 16 is connected between the path a and the hydraulic oil tank 70, the second check valve 16 is unidirectional in a direction from the hydraulic oil tank 70 to the path a, and when the output rod of the second steering cylinder 30 is extended outwards by an external force, hydraulic oil in the hydraulic oil tank 70 can enter the rodless cavity of the second steering cylinder 30 through the second check valve 16.
The embodiment of the utility model also provides the articulated dump truck, which comprises the hydraulic steering system and can provide larger steering force and faster steering speed for the articulated dump truck.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. The hydraulic steering system is characterized by comprising a pump, a flow amplifying valve (10), a first steering cylinder (20), a second steering cylinder (30), a first limiting valve (40), a second limiting valve (50), a steering control valve (60) and a hydraulic oil tank (70), wherein an oil inlet of the pump is communicated with the hydraulic oil tank (70), an oil outlet of the pump is communicated with an oil inlet of the flow amplifying valve (10), a first oil outlet of the flow amplifying valve (10) is simultaneously communicated with a rodless cavity of the first steering cylinder (20) and a rod-like cavity of the second steering cylinder (30), a second oil outlet of the flow amplifying valve (10) is simultaneously communicated with a rodless cavity of the second steering cylinder (30) and a rod-like cavity of the first steering cylinder (20), an oil inlet of the steering control valve (60) is communicated with an oil outlet of the pump, a first oil outlet of the steering control valve (60) is communicated with a first control cavity of the flow amplifying valve (10) through the first limiting valve (40), and when the first oil outlet of the steering control valve (60) is simultaneously communicated with a pilot valve (50) through the second limiting valve (50), the first limit valve (40) or the second limit valve (50) is touched, so that the first limit valve (40) or the second limit valve (50) can be reversed.
2. The hydraulic steering system according to claim 1, characterized in that the pump comprises a main pump (81) and a pilot pump (82), an oil outlet of the main pump (81) being in communication with an oil inlet of the flow amplifying valve (10), an oil outlet of the pilot pump (82) being in communication with an oil inlet of the steering control valve (60) via a pilot oil inlet line (821).
3. The hydraulic steering system according to claim 2, characterized in that the pilot oil inlet line (821) is provided with a filter (8211).
4. The hydraulic steering system according to claim 2, characterized in that a first pilot oil return (822) is provided between the pilot oil inlet (821) and the hydraulic tank (70), and a first relief valve (8221) is provided on the first pilot oil return (822).
5. The hydraulic steering system according to claim 2, characterized in that the pilot oil inlet line (821) is provided with an accumulator (8212).
6. The hydraulic steering system according to claim 2, characterized in that the pilot oil inlet line (821) is provided with a pressure reducing valve (8213).
7. The hydraulic steering system according to claim 2, characterized in that the flow amplifying valve (10) comprises a priority valve (11) and a hydraulic steering valve (12), an oil inlet of the priority valve (11) is communicated with an oil outlet of the main pump (81), a first oil outlet of the priority valve (11) is connected with an articulated dump truck, a second oil outlet of the priority valve (11) is communicated with an oil inlet of the hydraulic steering valve (12), a first oil outlet of the hydraulic steering valve (12) is simultaneously communicated with a rodless cavity of the first steering cylinder (20) and a rod-like cavity of the second steering cylinder (30), a second oil outlet of the hydraulic steering valve (12) is simultaneously communicated with a rodless cavity of the second steering cylinder (30) and a rod-like cavity of the first steering cylinder (20), a first oil outlet of the steering control valve (60) is communicated with the first pilot control cavity of the hydraulic steering valve (12) through the first limit valve (40), and a second oil outlet of the control valve (60) is simultaneously communicated with the second pilot cavity of the second steering valve (50).
8. The hydraulic steering system according to claim 2, wherein the flow amplifying valve (10) further comprises a second relief valve (13) and a third relief valve (14), an oil inlet of the second relief valve (13) communicates with a rodless chamber of the first steering cylinder (20) and a rod-containing chamber of the second steering cylinder (30) simultaneously, an oil inlet of the third relief valve (14) communicates with a rodless chamber of the second steering cylinder (30) and a rod-containing chamber of the first steering cylinder (20) simultaneously, and an oil outlet of the second relief valve (13) and an oil outlet of the third relief valve (14) communicate with the hydraulic tank (70) simultaneously.
9. The hydraulic steering system according to claim 2, wherein the flow amplifying valve (10) further comprises a first check valve (15) and a second check valve (16), the first check valve (15) being in unidirectional communication in a direction from the hydraulic tank (70) to the rodless cavity of the first steering cylinder (20) and the rod-containing cavity of the second steering cylinder (30), the second check valve (16) being in unidirectional communication in a direction from the hydraulic tank (70) to the rodless cavity of the second steering cylinder (30) and the rod-containing cavity of the first steering cylinder (20).
10. Articulated dump truck comprising a hydraulic steering system according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223479486.0U CN219339552U (en) | 2022-12-26 | 2022-12-26 | Hydraulic steering system and articulated dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223479486.0U CN219339552U (en) | 2022-12-26 | 2022-12-26 | Hydraulic steering system and articulated dump truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219339552U true CN219339552U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223479486.0U Active CN219339552U (en) | 2022-12-26 | 2022-12-26 | Hydraulic steering system and articulated dump truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219339552U (en) |
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2022
- 2022-12-26 CN CN202223479486.0U patent/CN219339552U/en active Active
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