CN220430279U - Hydraulic system and engineering vehicle - Google Patents
Hydraulic system and engineering vehicle Download PDFInfo
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- CN220430279U CN220430279U CN202322034519.9U CN202322034519U CN220430279U CN 220430279 U CN220430279 U CN 220430279U CN 202322034519 U CN202322034519 U CN 202322034519U CN 220430279 U CN220430279 U CN 220430279U
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- 239000003921 oil Substances 0.000 claims description 167
- 239000010720 hydraulic oil Substances 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 description 16
- 230000008859 change Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of engineering vehicles, in particular to a hydraulic system and an engineering vehicle. The outlet pressure of the CF port of the priority valve of the hydraulic system is low, and the traveling power source assembly drives the traveling mechanism and the whole vehicle to travel, so that high-pressure oil of the traveling power source assembly can open the first one-way valve through the pressure reducing valve and then flow to the steering cylinder through the steering gear, and further steering is realized. Meanwhile, high-pressure oil acts on a first pilot end of the pressure reducing valve after passing through the first one-way valve, and steering load pressure acts on a second pilot end of the pressure reducing valve through a feedback oil port of the steering gear. The setting mode can be used for enabling steering load pressure to act on the second pilot end of the pressure reducing valve in real time, the balance between the steering load pressure and the pressure of the outlet of the pressure reducing valve is established under the combined action of the springs of the second pilot end, the outlet pressure of the pressure reducing valve is further adjusted in real time, the dynamic adjustment of the outlet pressure of the pressure reducing valve is realized, the steering problem caused by overlarge or undersize pressure of a steering system is avoided, and therefore the purpose of energy conservation is achieved.
Description
Technical Field
The utility model relates to the technical field of engineering vehicles, in particular to a hydraulic system and an engineering vehicle.
Background
The land leveler mainly realizes functions of steering, crab walking and the like of the land leveler through front wheel steering and hinged hydraulic steering, and mainly realizes front wheel steering of the land leveler through a front wheel hydraulic system in normal working and driving processes. However, when a special emergency situation is met, such as the situation that a steering working pump is damaged and fails, a priority valve fails and cannot work when the grader runs at a high speed or works, the emergency steering is difficult to realize only by manpower. Other work machines such as wheel loader steering systems are hydraulic power steering, the power of which is provided by a loader hydraulic steering pump; the steering system comprises a steering pump, a steering device, a steering oil cylinder and other hydraulic elements, wherein the power of the steering pump is provided by an engine, so that the normal operation of the whole steering system is ensured, and the steering assistance is maintained. When the engine suddenly stalls (loses power) and the steering system fails (fails in steering), the loader loses the steering assistance and then turns to be difficult; this can result in the loader not being able to start or the steering system failing to move; and the loader in high-speed driving can easily rush out a safety area within a braking distance range due to steering difficulty after losing steering assistance, so that safety accidents are caused.
In view of the above problems, an emergency steering system is disclosed in the prior art, which is applied to engineering machinery, and the emergency steering system comprises a main power source loop and an auxiliary power source loop, wherein a steering pump in the main power source loop controls a steering auxiliary device and a steering oil cylinder through a steering priority valve, and the auxiliary power source loop controls the steering auxiliary device and the steering oil cylinder through a hydraulic motor; the hydraulic motor is a power element of the engineering machinery driving gearbox. When the main power source loop cannot work normally, the engineering machinery with the emergency steering system can continue running by inertial energy, at the moment, the hydraulic motor in the gearbox continues to rotate, the hydraulic motor can serve as an auxiliary power source to supply oil for a steering auxiliary device, and the hydraulic oil enters the steering oil cylinder to realize emergency power steering.
Although the emergency steering system can realize the purpose that the hydraulic motor in the gearbox can provide hydraulic oil for the steering cylinder to realize steering, the pressure of the hydraulic motor in the gearbox is unstable after the hydraulic oil flows out of the gearbox, the steering cannot be realized when the pressure is smaller than the pressure required by the steering cylinder, and the pressure is larger than the pressure required by the steering cylinder, so that part of hydraulic oil is wasted.
Therefore, a hydraulic system is needed to solve the above technical problems.
Disclosure of Invention
The utility model aims to provide a hydraulic system and a construction vehicle, which can control the hydraulic pressure of hydraulic pressure flowing into a steering cylinder according to actual needs.
To achieve the purpose, the utility model adopts the following technical scheme:
the hydraulic system comprises a steering power source, a priority valve, a steering gear, a steering oil cylinder, a working multi-way valve and a hydraulic oil tank, wherein an oil inlet of the steering power source is communicated with the hydraulic oil tank, an oil outlet of the steering power source is communicated with an inlet of the priority valve, a CF port of the priority valve is communicated with a P port of the steering gear, a steering feedback oil port LS port of the priority valve is communicated with a feedback oil port of the steering gear, an EF port of the priority valve is communicated with the working multi-way valve, and two oil ports of the steering gear are respectively communicated with two oil ports of the steering oil cylinder, and the hydraulic system further comprises:
the oil outlet of the walking power source assembly is connected with the P port of the steering gear;
the hydraulic steering device comprises a pressure reducing valve and a first one-way valve, wherein an oil inlet of the pressure reducing valve is connected with an oil outlet of a walking power source, the oil outlet of the pressure reducing valve is connected with a P port of a steering gear, the first one-way valve is arranged between the pressure reducing valve and the steering gear and is configured to enable oil to flow into the P port of the steering gear from the oil outlet of the pressure reducing valve, the oil outlet of the first one-way valve is connected with a first pilot end of the pressure reducing valve, a second pilot end of the pressure reducing valve is connected with an LS port of the steering gear, and a spring is arranged at the second pilot end.
As a preferable technical scheme of the hydraulic system, a second one-way valve is arranged between the CF port of the priority valve and the P port of the steering gear, the second one-way valve is configured to enable oil to flow from the priority valve to the steering gear, and an oil outlet of the first one-way valve is communicated with an oil outlet of the second one-way valve.
As a preferable technical solution of the hydraulic system, a third one-way valve is disposed between the steering feedback port LS of the priority valve and the feedback port of the steering gear, and the third one-way valve is configured to enable the oil to flow from the steering feedback port LS of the priority valve to the feedback port of the steering gear.
As a preferable technical scheme of the hydraulic system, the walking power source assembly comprises a hydraulic pump and a hydraulic motor, wherein an oil outlet of the hydraulic pump is respectively communicated with an oil inlet of the pressure reducing valve and an oil inlet of the hydraulic motor.
As a preferable mode of the hydraulic system, the hydraulic system further includes a fourth check valve through which a connection oil passage between the hydraulic pump and the hydraulic motor is in unidirectional communication with the pressure reducing valve, and the fourth check valve is configured to allow oil to flow from the hydraulic pump to the pressure reducing valve.
As a preferable technical solution of the hydraulic system, the number of the fourth check valves is two, one oil port of the hydraulic pump is communicated with one oil port of the hydraulic motor through one connecting oil path, the other oil port of the hydraulic pump is communicated with the other oil port of the hydraulic motor through another connecting oil path, the two connecting oil paths can be respectively communicated with the inlet of the pressure reducing valve in a unidirectional manner through one fourth check valve, and the fourth check valve is configured to enable the oil to flow to the pressure reducing valve through the hydraulic pump or the hydraulic motor.
As a preferable technical scheme of the hydraulic system, the hydraulic pump is a variable pump.
As a preferable technical scheme of the hydraulic system, the walking power source assembly further comprises a proportional electromagnetic valve and a variable piston, wherein an oil outlet and an oil inlet of the proportional electromagnetic valve are respectively communicated with two chambers of the variable piston, and a piston of the variable piston is mechanically connected with a swash plate of the hydraulic pump.
As a preferable technical scheme of the hydraulic system, the steering power source comprises a steering pump and an oil suction filter element, and an oil inlet of the steering pump is communicated with the oil suction filter element.
The utility model also provides an engineering vehicle, which comprises the hydraulic system according to any one of the schemes.
The utility model has the beneficial effects that:
when the steering power source fails or other reasons cannot supply oil to the steering system, the outlet pressure of the CF port of the priority valve is low, and the traveling power source assembly drives the traveling mechanism and the whole vehicle to travel, so that the high-pressure oil of the traveling power source assembly can open the first one-way valve through the pressure reducing valve and then flow to the steering oil cylinder through the steering gear, and further steering is realized. Meanwhile, high-pressure oil acts on a first pilot end of the pressure reducing valve after passing through the first one-way valve, steering load pressure acts on a second pilot end of the pressure reducing valve after passing through a feedback oil port of the steering gear, and the second pilot end is provided with a spring which acts together. The setting mode can be used for enabling steering load pressure to act on the second pilot end of the pressure reducing valve in real time, the balance between the steering load pressure and the pressure of the outlet of the pressure reducing valve is established under the combined action of the spring of the second pilot end, and then the outlet pressure of the pressure reducing valve is adjusted in real time, namely, the pressure acting on a steering system is adjusted in real time, the dynamic adjustment of the outlet pressure of the pressure reducing valve is realized, the steering problem caused by overlarge or undersize pressure of the steering system is avoided, and the purpose of energy conservation is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic structural diagram of a hydraulic system according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a hydraulic system according to an embodiment of the present utility model.
In the figure:
1. a steering power source; 2. a priority valve; 3. a diverter; 4. a steering cylinder; 5. a hydraulic oil tank; 6. a pressure reducing valve; 61. a first pilot end; 62. a second pilot end; 7. a first one-way valve; 8. a second one-way valve; 9. a third one-way valve; 10. a hydraulic pump; 11. a hydraulic motor; 12. a fourth one-way valve; 13. a proportional solenoid valve; 14. a variable piston; 15. an oil absorption filter element; 16. a make-up pump; 17. an oil-compensating overflow valve; 18. a pressure cut-off valve; 19. an oil supplementing one-way valve.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features 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.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1 and 2, the present embodiment provides a hydraulic system capable of supplying the steering cylinder 4 with oil of constant pressure in the event of sudden engine stall or failure of the steering system.
Specifically, the hydraulic system includes steering power source, priority valve 2, steering gear 3, steering cylinder 4, work multiple unit valve and hydraulic tank 5, the oil inlet and the hydraulic tank 5 intercommunication of steering power source, the oil-out of steering power source and the import intercommunication of priority valve 2, priority valve 2 includes oil inlet P mouth, oil-out CF mouth, turn to feedback port LS and oil-out EF mouth, the CF mouth of priority valve 2 and the P mouth intercommunication of steering gear 3, the feedback port LS mouth of priority valve 2 and the feedback port intercommunication of steering gear 3, the EF mouth and the work multiple unit valve intercommunication of priority valve 2, two hydraulic fluid ports of steering gear 3 respectively with two hydraulic fluid ports intercommunication of steering cylinder 4 still include: the walking power source assembly, the pressure reducing valve 6 and the first one-way valve 7, wherein an oil outlet of the walking power source assembly is connected with a P port of the steering gear 3; an oil inlet of the pressure reducing valve 6 is connected with an oil outlet of the walking power source, an oil outlet of the pressure reducing valve 6 is connected with a P port of the steering gear 3, a first one-way valve 7 is arranged between the pressure reducing valve 6 and the steering gear 3, the first one-way valve 7 is configured to enable oil to flow into the P port of the steering gear 3 from the oil outlet of the pressure reducing valve 6, an oil outlet of the first one-way valve 7 is connected with a first pilot end 61 of the pressure reducing valve 6, a second pilot end 62 of the pressure reducing valve 6 is connected with an LS port of the steering gear 3, and the second pilot end 62 is provided with a spring.
When the steering power source fails or the oil cannot be supplied to the steering system due to other reasons, the outlet pressure of the CF port of the priority valve 2 is low, and the traveling power source assembly drives the traveling mechanism and the whole vehicle to travel, so that the high-pressure oil of the traveling power source assembly can open the first one-way valve 7 through the pressure reducing valve 6 and then flow to the steering cylinder 4 through the steering gear 3, and further steering is realized. Meanwhile, high-pressure oil acts on a first pilot end 61 of the pressure reducing valve 6 after passing through the first one-way valve 7, steering load pressure acts on a second pilot end 62 of the pressure reducing valve 6 after passing through a feedback oil port of the steering gear 3, and the second pilot end 62 is provided with a spring, and the second pilot end 62 and the spring act together. The arrangement mode can be used for enabling steering load pressure to act on the second pilot end 62 of the pressure reducing valve 6 in real time, and the steering load pressure and the spring of the second pilot end 62 jointly act on the pressure of the outlet of the first one-way valve 7 to establish balance, so that the outlet pressure of the pressure reducing valve 6 is regulated in real time, namely, the pressure acting on a steering system is regulated in real time, the dynamic regulation of the outlet pressure of the pressure reducing valve 6 is realized, the steering problem caused by overlarge or overlarge pressure of the steering system is avoided, and the purpose of energy conservation is realized.
In some embodiments, a second one-way valve 8 is disposed between the CF port of the priority valve 2 and the P port of the diverter 3, the second one-way valve 8 being configured to allow oil to flow from the priority valve 2 to the diverter 3, the oil outlet of the first one-way valve 7 being in oil communication with the oil outlet of the second one-way valve 8. This arrangement prevents oil passing through the first non-return valve 7 from flowing through the priority valve 2 to the working multiplex valve connected to the priority valve 2 or from leaking.
The steering feedback oil port LS of the priority valve 2 is communicated with the feedback oil port of the steering device 3, the steering feedback oil port LS of the priority valve 2 and the feedback oil port of the steering device 3 are provided with a third one-way valve 9, and the third one-way valve 9 is configured to enable oil to flow from the steering feedback oil port of the priority valve 2 to the feedback oil port of the steering device 3. When the steering power source operates the steering gear 3 in a normal working state, the steering power source absorbs oil from the hydraulic oil tank 5, and outputs pressure oil to the steering oil cylinder 4 through the CF port of the priority valve 2, the third one-way valve 9 and the steering gear 3 to realize a steering function, and redundant hydraulic oil flows to the working multi-way valve through the EF port of the priority valve 2; meanwhile, the output pressure oil of the steering power source flows to one end of the third one-way valve 9 through an external oil way, so that the third one-way valve 9 is opened, and the steering load pressure is transmitted to an LS port of the priority valve 2 through the third one-way valve 9 in the steering process, so that normal steering is realized.
In the embodiment, the walking power source assembly comprises a hydraulic pump 10 and a hydraulic motor 11, wherein the oil outlet of the hydraulic pump 10 is respectively communicated with the oil inlet of the pressure reducing valve 6 and the oil inlet of the hydraulic motor 11. The hydraulic pump 10 works to supply oil to the hydraulic motor 11 so as to drive the whole machine travelling mechanism to travel, and the structure and the working principle of the hydraulic pump 10 and the hydraulic motor 11 are the existing common structure, and the working principle of the hydraulic pump and the hydraulic motor 11 is not described in detail.
In some embodiments, the hydraulic system further includes a fourth check valve 12, and the connection path between the hydraulic pump 10 and the hydraulic motor 11 is capable of unidirectional communication with the pressure reducing valve 6 through the fourth check valve 12, and the fourth check valve 12 is configured to allow oil to flow from the hydraulic pump 10 to the pressure reducing valve 6. The fourth check valve 12 prevents the oil in the priority valve 2 from entering the hydraulic pump 10 from the relief valve 6.
Further, in the present embodiment, as shown in fig. 1, the number of the fourth check valves 12 is two, one port of the hydraulic pump 10 is communicated with one port of the hydraulic motor 11 through one connection oil path, the other port of the hydraulic pump 10 is communicated with the other port of the hydraulic motor 11 through the other connection oil path, the two connection oil paths can be respectively communicated with the inlet of the pressure reducing valve 6 in a unidirectional manner through one fourth check valve 12, and the fourth check valve 12 is configured to enable the oil to flow to the pressure reducing valve 6 through the hydraulic pump 10 or the hydraulic motor 11. Two fourth check valves 12 are arranged on the pipeline between the hydraulic pump 10 and the hydraulic motor 11, and the two fourth check valves 12 form a shuttle valve for acquiring high-pressure oil between the hydraulic pump 10 and the hydraulic motor 11.
When the steering gear 3 does not work, the hydraulic oil output by the steering power source passes through the EF port of the priority valve 2 to the working multi-way valve, and the first one-way valve 7 is used for preventing impact and oil return influence of the hydraulic oil used for steering during normal steering work on the pressure reducing valve 6 and the fourth one-way valve 12. Meanwhile, the hydraulic oil for steering acts on the outlet of the first one-way valve 7 to enable the first one-way valve 7 to be closed and not pass through the pressure reducing valve 6, so that high-pressure oil of the hydraulic system is not transmitted to the walking power source assembly through the fourth one-way valve 12.
In the present embodiment, the hydraulic pump 10 is a variable displacement pump. The variable displacement pump can change the flow rate as needed, so that the purpose of supplying oil to the hydraulic pump 10 for traveling and steering at the same time can be achieved.
The walking power source assembly further comprises an oil supplementing pump 16, an oil supplementing one-way valve, an oil supplementing overflow valve 17 and a pressure cut-off valve 18, wherein an oil inlet of the oil supplementing pump 16 is communicated with the hydraulic oil tank 5, an outlet of the oil supplementing pump 16 is connected with an oil supplementing one-way valve 19, the oil supplementing one-way valve 19 is connected with a connecting oil way of the hydraulic motor 11 and the hydraulic pump 10 through an oil supplementing oil way, the pressure cut-off valve 18 is arranged on the oil supplementing oil way, and an oil inlet of the pressure cut-off valve 18 is connected with the hydraulic oil tank 5 through the oil supplementing overflow valve 17; the pressure cut-off valve 18 is bypassed with an oil replenishment check valve 19, the oil replenishment check valve 19 being configured to cause oil to flow from an oil outlet of the pressure cut-off valve 18 to an oil inlet of the pressure cut-off valve 18. The oil supplementing pump 16 works to supplement oil into a connecting oil path of the hydraulic motor 11 and the hydraulic pump 10 through the oil supplementing one-way valve 19, and when the oil pressure in the connecting oil path of the hydraulic motor 11 and the hydraulic pump 10 is overlarge, the pressure cut-off valve 18 and the oil supplementing overflow valve 17 are opened to release pressure, and at the moment, the oil supplementing one-way valve 19 plays a role of protecting and preventing the oil from flowing backwards to the oil supplementing pump.
In some embodiments, the walking power source assembly further comprises a proportional solenoid valve 13 and a variable piston 14, wherein the working oil ports of the proportional solenoid valve 13 are respectively communicated with two chambers of the variable piston 14, and the piston of the variable piston 14 is mechanically connected with a swash plate of the hydraulic pump 10. The proportional solenoid valve 13 can change the piston position of the variable piston 14, and the change of the piston position can adjust the angle of the swash plate, thereby achieving the purpose of changing the flow rate of the hydraulic pump 10. The structures of the proportional solenoid valve 13 and the variable piston 14 are all prior art, and are not described in detail herein.
In some embodiments, in the present embodiment, the steering power source includes a steering pump 1 and an oil suction filter element 15, and an oil inlet of the steering pump 1 is in communication with the oil suction filter element 15. The oil suction filter element 15 can filter impurities in oil liquid and prevent the impurities from entering the steering pump 1.
The dynamic adjustment of the outlet pressure of the pressure reducing valve 6 can further avoid the situation that the pressure of the steering system is too high due to the fact that the setting of the outlet pressure of the pressure reducing valve 6 is too high, and the steering system is broken down during emergency steering; meanwhile, the pressure of the hydraulic motor 11 is higher than the output pressure of the steering pump 1, the outlet pressure of the pressure reducing valve 6 is too high, in the driving process, the pressure of the high-pressure oil of the hydraulic motor 11 after being reduced by the fourth one-way valve 12 and the pressure reducing valve 6 is higher than the output pressure of the steering pump 1, the high-pressure oil after being reduced acts on the output port of the second one-way valve 8, the output pressure of the steering pump 1 is communicated with the input port of the second one-way valve 8, and the input port pressure is lower than the output port pressure, so that the second one-way valve 8 is closed. Therefore, the steering pump 1 cannot normally supply oil to the steering gear, and the steering pressure of the entire steering gear 3, the steering cylinder 4, and the like is excessively high, resulting in failure. If the relief valve 6 sets the relief outlet pressure too low, the steering pump 1 cannot effectively supply pressurized oil to the steering system in the event of failure, and steering is achieved.
It should be noted that the structure of the priority valve 2, the structure of the steering device 3, and the structure of the steering cylinder 4 are all conventional techniques, and will not be described herein.
The embodiment also discloses an engineering vehicle, which comprises the hydraulic system in the embodiment.
Because of the hydraulic system, the engineering vehicle of the embodiment of the present utility model has all the advantages and beneficial effects of the above embodiment, and will not be described herein.
Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.
Claims (10)
1. The hydraulic system comprises a steering power source, a priority valve (2), a steering gear (3), a steering oil cylinder (4), a working multi-way valve and a hydraulic oil tank (5), wherein an oil inlet of the steering power source is communicated with the hydraulic oil tank (5), an oil outlet of the steering power source is communicated with an inlet of the priority valve (2), a CF port of the priority valve (2) is communicated with a P port of the steering gear (3), a steering feedback oil port LS port of the priority valve (2) is communicated with a feedback oil port of the steering gear (3), an EF port of the priority valve (2) is communicated with the working multi-way valve, and two oil ports of the steering gear (3) are respectively communicated with two oil ports of the steering oil cylinder (4), and the hydraulic system is characterized by further comprising:
the oil outlet of the walking power source assembly is connected with the P port of the steering gear (3);
the hydraulic steering device comprises a pressure reducing valve (6) and a first one-way valve (7), wherein an oil inlet of the pressure reducing valve (6) is connected with an oil outlet of a walking power source, an oil outlet of the pressure reducing valve (6) is connected with a P port of a steering gear (3), the first one-way valve (7) is arranged between the pressure reducing valve (6) and the steering gear (3), the first one-way valve (7) is configured to enable oil to flow into the P port of the steering gear (3) from the oil outlet of the pressure reducing valve (6), an oil outlet of the first one-way valve (7) is connected with a first pilot end (61) of the pressure reducing valve (6), a second pilot end (62) of the pressure reducing valve (6) is connected with an LS port of the steering gear (3), and a spring is arranged at the second pilot end (62).
2. Hydraulic system according to claim 1, characterized in that a second non-return valve (8) is arranged between the CF port of the priority valve (2) and the P port of the diverter (3), the second non-return valve (8) being configured to let oil flow from the priority valve (2) to the diverter (3), the oil outlet of the first non-return valve (7) being in communication with the oil outlet of the second non-return valve (8).
3. Hydraulic system according to claim 1, characterized in that a third non-return valve (9) is arranged between the steering feedback port LS of the priority valve (2) and the feedback port of the diverter (3), the third non-return valve (9) being configured to let the oil flow from the steering feedback port LS of the priority valve (2) to the feedback port of the diverter (3).
4. The hydraulic system according to claim 1, characterized in that the walking power source assembly comprises a hydraulic pump (10) and a hydraulic motor (11), the oil outlet of the hydraulic pump (10) being in communication with the oil inlet of the pressure reducing valve (6) and the oil inlet of the hydraulic motor (11), respectively.
5. The hydraulic system according to claim 4, further comprising a fourth one-way valve (12), through which fourth one-way valve (12) a connection oil path of the hydraulic pump (10) and the hydraulic motor (11) is connectable in one way with the pressure reducing valve (6), the fourth one-way valve (12) being configured to allow oil to flow from the hydraulic pump (10) to the pressure reducing valve (6).
6. The hydraulic system according to claim 5, characterized in that the number of the fourth check valves (12) is two, one port of the hydraulic pump (10) is communicated with one port of the hydraulic motor (11) through one connecting oil path, the other port of the hydraulic pump (10) is communicated with the other port of the hydraulic motor (11) through another connecting oil path, the two connecting oil paths can be respectively communicated with an inlet of the pressure reducing valve (6) through one fourth check valve (12), and the fourth check valve (12) is configured to enable the oil to flow to the pressure reducing valve (6) through the hydraulic pump (10) or the hydraulic motor (11).
7. The hydraulic system according to claim 4, characterized in that the hydraulic pump (10) is a variable displacement pump.
8. The hydraulic system of claim 7, wherein the walking power source assembly further comprises a proportional solenoid valve (13) and a variable piston (14), wherein an oil outlet and an oil inlet of the proportional solenoid valve (13) are respectively communicated with two chambers of the variable piston (14), and a piston of the variable piston (14) is mechanically connected with a swash plate of the hydraulic pump (10).
9. The hydraulic system according to any one of claims 1-8, characterized in that the steering power source comprises a steering pump (1) and an oil suction filter cartridge (15), the oil inlet of the steering pump (1) being in communication with the oil suction filter cartridge (15).
10. Engineering vehicle, characterized in that it comprises a hydraulic system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322034519.9U CN220430279U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system and engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322034519.9U CN220430279U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system and engineering vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220430279U true CN220430279U (en) | 2024-02-02 |
Family
ID=89703689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322034519.9U Active CN220430279U (en) | 2023-07-31 | 2023-07-31 | Hydraulic system and engineering vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220430279U (en) |
-
2023
- 2023-07-31 CN CN202322034519.9U patent/CN220430279U/en active Active
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