CN109017981B - Walking machine and hydraulic steering system thereof - Google Patents
Walking machine and hydraulic steering system thereof Download PDFInfo
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- CN109017981B CN109017981B CN201810812920.1A CN201810812920A CN109017981B CN 109017981 B CN109017981 B CN 109017981B CN 201810812920 A CN201810812920 A CN 201810812920A CN 109017981 B CN109017981 B CN 109017981B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
- B62D5/075—Supply of pressurised fluid for steering also supplying other consumers ; control thereof using priority valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic steering system of walking machinery, which comprises a hydraulic pump, a steering oil cylinder, a mode switching valve, a proportional multi-way valve for electrically controlling steering and a steering gear for manually controlling steering, wherein the mode switching valve is used for controlling the steering of the hydraulic pump; when the steering is controlled manually, the mode switching valve is in a first working position, so that the steering gear is communicated with the steering oil cylinder, and when the steering is controlled electrically, the mode switching valve is in a second working position, so that the proportional multi-way valve is communicated with the steering oil cylinder. Realize the electric control through the proportional multi-way valve and turn to, realize manual control through the steering gear and turn to realize the switching that the electric control turned to and manual control turned to through the mode diverter valve, simple structure, the commonality is strong, and system reliability is high, and the component is small in quantity, and is small, and then practices thrift installation space, and practices thrift the cost. The invention also discloses a walking machine comprising the hydraulic steering system.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a hydraulic steering system of walking machinery. Furthermore, the invention also relates to a walking machine comprising the hydraulic steering system.
Background
With the development of the explosion-shed type of the unmanned technology of the automobile, the unmanned technology is well developed in the aspects of the traveling machinery such as engineering machinery, agricultural and forestry machinery and special vehicles thereof nowadays, and as a development direction of the engineering machinery, the unmanned technology is widely applied, has very obvious effects on improving the personal safety of workers and the working efficiency of the whole engineering, and particularly has very wide application in landslide-prone areas, areas with strong radiation and explosion-prone areas, dangerous mine areas, deep sea operation areas, even space exploration areas and other dangerous operation areas.
The steering of the vehicle in the unmanned or remote control technology can adopt pure mechanical steering, hydraulic power steering, electric power steering, pneumatic power steering and full hydraulic steering. Unmanned or remotely controlled vehicles are generally applied as electric power steering and electro-hydraulic dual-control type hydraulic steering. Electric power steering is commonly used for cars and travelling machines such as small-tonnage engineering machinery, agricultural and forestry machinery and special vehicles thereof. However, two or more large-sized heavy duty vehicles, large-sized engineering machinery, agricultural and forestry machinery and special vehicles thereof are generally applied to electro-hydraulic double-control type hydraulic steering.
However, in the existing electro-hydraulic dual-control type hydraulic steering gear, an integrated valve block with corresponding functions can be realized by combining and integrating various cartridge valves, and then a steering system is formed by matching with a common hydraulic steering gear, but the integrated valve block needs nonstandard design and is still complex to process, and in addition, the large size of the valve block per se needs a host machine to plan the installation position of the integrated valve block.
Therefore, how to provide a hydraulic steering system with a simple structure is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a hydraulic steering system of a walking machine, which has the advantages of simple structure, strong universality, less component quantity, high system reliability and cost saving. Another object of the present invention is to provide a walking machine comprising the above hydraulic steering system.
In order to solve the technical problem, the invention provides a hydraulic steering system of a walking machine, which comprises a hydraulic pump, a steering oil cylinder, a mode switching valve, a proportional multi-way valve for electrically controlling steering and a steering gear for manually controlling steering, wherein the mode switching valve is used for switching between a mode switching mode and a mode switching mode;
an oil outlet of the hydraulic pump is simultaneously communicated with an oil inlet of the proportional multi-way valve and an oil inlet of the steering gear, the oil outlet of the proportional multi-way valve and the oil outlet of the steering gear are simultaneously communicated with an oil tank, a left output port and a right output port of the steering gear are respectively communicated with two oil inlets of the mode switching valve, a left output port and a right output port of the proportional multi-way valve are respectively communicated with the other two oil inlets of the mode switching valve, and two oil outlets of the mode switching valve are respectively communicated with two cavities of the steering oil cylinder;
when the steering is controlled manually, the mode switching valve is located at a first working position, so that the steering gear is communicated with the steering oil cylinder, and when the steering is controlled electrically, the mode switching valve is located at a second working position, so that the proportional multi-way valve is communicated with the steering oil cylinder.
Preferably, the mode switching valve is specifically a two-position six-way electromagnetic directional valve, and the two-position six-way electromagnetic directional valve comprises a first oil inlet, a second oil inlet, a third oil inlet, a fourth oil inlet, a first oil outlet and a second oil outlet;
the first oil inlet is communicated with a left output port of the steering gear, the second oil inlet is communicated with a right output port of the steering gear, the third oil inlet is communicated with a left output port of the proportional multi-way valve, the fourth oil inlet is communicated with a right output port of the proportional multi-way valve, the first oil outlet is communicated with a left cavity of the steering oil cylinder, and the second oil outlet is communicated with a right cavity of the steering oil cylinder;
when the two-position six-way electromagnetic reversing valve is located at a first working position, the first oil inlet is communicated with the first oil outlet, the second oil inlet is communicated with the second oil outlet, when the two-position six-way electromagnetic reversing valve is located at a second working position, the third oil inlet is communicated with the first oil outlet, and the fourth oil inlet is communicated with the second oil outlet.
Preferably, a filter and a plurality of overflow valves are arranged in the proportional multi-way valve.
Preferably, a plurality of check valves and a plurality of overflow valves are arranged in the diverter.
Preferably, the hydraulic control system further comprises a hydraulic control priority valve, wherein the hydraulic control priority valve comprises a priority oil inlet, a priority oil outlet, a priority pressure relief port and a priority hydraulic control port;
the priority oil inlet is communicated with an oil outlet of the hydraulic pump, the priority oil outlet is simultaneously communicated with an oil inlet of the proportional multi-way valve and an oil inlet of the steering gear, the priority pressure relief port is communicated with an oil tank, and a load pressure feedback port of the proportional multi-way valve and a load pressure feedback port of the steering gear are simultaneously communicated with the priority hydraulic control port;
when the pressure is normal, the hydraulic control priority valve is located at a first working position, the priority oil inlet is only communicated with the priority oil outlet, when the pressure is overlarge, the hydraulic control priority valve is located at a second working position, and the priority oil inlet is communicated with the priority oil outlet through damping and is simultaneously communicated with the priority pressure relief opening.
Preferably, the hydraulic pump is a load-sensitive hydraulic pump, and the load pressure feedback port of the proportional multi-way valve and the load pressure feedback port of the steering gear are simultaneously communicated with a hydraulic control port of the load-sensitive hydraulic pump.
Preferably, the hydraulic control system further comprises a shuttle valve, one oil inlet of the shuttle valve is simultaneously communicated with the load pressure feedback port of the proportional multi-way valve and the load pressure feedback port of the steering gear, the other oil inlet of the shuttle valve is communicated with the load pressure feedback port of the auxiliary system, and the oil outlet of the shuttle valve is communicated with the hydraulic control port of the load sensitive hydraulic pump.
The invention provides a walking machine, which comprises a hydraulic steering system and is characterized in that the hydraulic steering system is any one of the hydraulic steering systems.
Preferably, the traveling machine is a large-sized load-carrying vehicle, a large-sized engineering machine or an agricultural and forestry machine.
The invention provides a hydraulic steering system of walking machinery, which comprises a hydraulic pump, a steering oil cylinder, a mode switching valve, a proportional multi-way valve for electrically controlling steering and a steering gear for manually controlling steering, wherein the mode switching valve is used for controlling the steering of the hydraulic pump; an oil outlet of the hydraulic pump is simultaneously communicated with an oil inlet of the proportional multi-way valve and an oil inlet of the steering gear, the oil outlet of the proportional multi-way valve and the oil outlet of the steering gear are simultaneously communicated with an oil tank, a left output port and a right output port of the steering gear are respectively communicated with two oil inlets of the mode switching valve, a left output port and a right output port of the proportional multi-way valve are respectively communicated with the other two oil inlets of the mode switching valve, and the two oil outlets of the mode switching valve are respectively communicated with two; when the steering is controlled manually, the mode switching valve is in a first working position, so that the steering gear is communicated with the steering oil cylinder, and when the steering is controlled electrically, the mode switching valve is in a second working position, so that the proportional multi-way valve is communicated with the steering oil cylinder.
Realize the electric control through the proportional multi-way valve and turn to, realize manual control through the steering gear and turn to realize the switching that the electric control turned to and manual control turned to through the mode diverter valve, simple structure, the commonality is strong, and system reliability is high, and the component is small in quantity, and is small, and then practices thrift installation space, and practices thrift the cost.
The invention also provides a walking machine comprising the hydraulic steering system, and the walking machine has the technical effects due to the technical effects of the hydraulic steering system, and the walking machine is not described in detail herein.
Drawings
FIG. 1 is a hydraulic schematic diagram of one embodiment of a hydraulic steering system provided by the present invention.
Detailed Description
The core of the invention is to provide a hydraulic steering system of a walking machine, which has simple structure, strong universality, less components, high system reliability and cost saving. Another core of the present invention is to provide a walking machine including the above hydraulic steering system.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to the drawings, fig. 1 is a hydraulic schematic diagram of an embodiment of a hydraulic steering system according to the present invention.
The specific embodiment of the invention provides a hydraulic steering system of a walking machine, which comprises a hydraulic pump, a steering oil cylinder 6, a mode switching valve, a proportional multi-way valve 4 and a steering gear 5.
The proportional multi-way valve 4 is used for electric control steering, is internally provided with a multi-way electromagnetic directional valve, switches to different working positions through electric control, and then controls two cavities of a hydraulic oil inlet and outlet steering oil cylinder 6, realizes electric control steering of equipment, is also provided with a filter to filter oil, is simultaneously provided with a plurality of overflow valves with different opening pressure coefficients, and improves system safety and proportional control according to the flow direction of pressure control hydraulic oil.
The steering gear 5 is used for manual control to turn to, and its inside is provided with the hand-operated directional control valve and controls the part, controls the different work positions that the part switches the hand-operated directional control valve through manual operation, and then controls two chambeies of hydraulic oil business turn over steering cylinder 6, realizes that the manual control of equipment turns to, still is provided with a plurality of overflow valves and check valve simultaneously, through the connection of a plurality of valves, prevents the backward flow, guarantees equipment safe operation.
An oil outlet of the hydraulic pump is simultaneously communicated with an oil inlet P of the proportional multi-way valve 4 and an oil inlet P of the steering gear 5, an oil outlet T of the proportional multi-way valve 4 and an oil outlet T of the steering gear 5 are simultaneously communicated with an oil tank, a left output port L and a right output port R of the steering gear 5 are respectively communicated with two oil inlets of the mode switching valve, a left output port B and a right output port A of the proportional multi-way valve 4 are respectively communicated with the other two oil inlets of the mode switching valve, and the two oil outlets of the mode switching valve are respectively communicated with two cavities.
When the steering mode is manually controlled, the mode switching valve is located at a first working position, the first two oil inlets of the mode switching valve are communicated with the two oil outlets, the steering gear 5 is communicated with the steering oil cylinder 6, and the proportional multi-way valve 4 is isolated from the steering oil cylinder 6. When the steering is electrically controlled, the mode switching valve is in the second working position, the two rear oil inlets of the mode switching valve are communicated with the two oil outlets, the proportional multi-way valve 4 is communicated with the steering oil cylinder 6, and the steering gear 5 is isolated from the steering oil cylinder 6. Realize through proportional multi-way valve 4 that electric control turns to, realize manual control through steering gear 5 and turn to realize the switching that electric control turned to and manual control turned to through the mode switching valve, simple structure, the commonality is strong, and the system reliability is high, and the component is small in quantity, and is small, and then practices thrift installation space, and practices thrift the cost.
Specifically, the mode switching valve may be various types of reversing valves, and it is only necessary to ensure completion of the reversing operation, and the mode switching valve may be a two-position six-way electromagnetic reversing valve 3, where the two-position six-way electromagnetic reversing valve 3 includes a first oil inlet a, a second oil inlet B, a third oil inlet C, a fourth oil inlet D, a first oil outlet E, and a second oil outlet F;
the first oil inlet A is communicated with a left output port L of the steering gear 5, the second oil inlet B is communicated with a right output port R of the steering gear 5, the third oil inlet C is communicated with a left output port B of the proportional multi-way valve 4, the fourth oil inlet D is communicated with a right output port A of the proportional multi-way valve 4, the first oil outlet E is communicated with a left cavity of the steering oil cylinder 6, and the second oil outlet F is communicated with a right cavity of the steering oil cylinder 6.
In the working process, when the two-position six-way electromagnetic directional valve is in a manual control reversing mode, the two-position six-way electromagnetic directional valve 3 is not powered, when the two-position six-way electromagnetic directional valve 3 is in a first working position, namely, the left position in the drawing, the first oil inlet A of the two-position six-way electromagnetic directional valve 3 is communicated with the first oil outlet E, the second oil inlet B of the two-position six-way electromagnetic directional valve 3 is communicated with the second oil outlet F, hydraulic oil output by the hydraulic pump 1 sequentially enters the two-position six-way electromagnetic directional valve 3 and the steering gear 5, and the hydraulic oil is controlled to enter a left cavity and a right cavity of the steering oil cylinder from the left output port L and the right output port R of the steering gear 5 according to the state of an internal valve of the steering gear 5, so that the steering oil cylinder 6 is isolated from the proportional multi-way valve 4, and the proportional multi-way valve 4 cannot influence the steering of the equipment.
When the two-position six-way electromagnetic directional valve 3 is in an electric control reversing mode, when the two-position six-way electromagnetic directional valve 3 is in a second working position, namely the right position in the attached drawing, a third oil inlet C of the two-position six-way electromagnetic directional valve 3 is communicated with a first oil outlet E, a fourth oil inlet D is communicated with a second oil outlet F, hydraulic oil output by the hydraulic pump 1 sequentially enters the two-position six-way electromagnetic directional valve 3 and the proportional multi-way valve 4, and the hydraulic oil is controlled to enter a left cavity and a right cavity of the steering oil cylinder through a left output port B and a right output port A of the proportional multi-way valve 4 according to the state of an internal valve of the proportional multi-way valve 4, so that electric steering of equipment is realized, at the moment, the first oil inlet A and the second oil inlet B of the two-position six-way electromagnetic directional valve 3.
On the basis of the hydraulic steering system provided by each of the above specific embodiments, a hydraulic control priority valve 2 is further provided, which may be specifically a two-position three-way hydraulic control valve, and the hydraulic control priority valve 2 includes a priority oil inlet P, a priority oil outlet CF, a priority pressure relief port EF, and a priority hydraulic control port L S.
The priority oil inlet P is communicated with an oil outlet of a hydraulic pump, the priority oil outlet CF is simultaneously communicated with an oil inlet P of the proportional multi-way valve 4 and an oil inlet P of the steering gear 5, the priority pressure relief port EF is communicated with an oil tank, a load pressure feedback port L S of the proportional multi-way valve 4 and a load pressure feedback port L S of the steering gear 5 are simultaneously communicated with a priority hydraulic control port L S, the pressure of a load is output to the priority hydraulic control port L S through the two load pressure feedback ports L S in the working process, and hydraulic oil capable of reflecting the load pressure enters the priority hydraulic control port L S through the two load pressure feedback ports L S.
When the pressure is normal, the hydraulic oil at the priority hydraulic control port L S enables the hydraulic control priority valve 2 to be at the first working position, namely the right position in the drawing, under the action of a plurality of damping on the hydraulic control pipeline, the priority oil inlet P is only communicated with the priority oil outlet CF, and the hydraulic oil output by the hydraulic pump 1 normally enters the system.
When the pressure is too large, the hydraulic oil at the priority hydraulic control port L S enables the hydraulic control priority valve 2 to be at the second working position, namely the left position in the attached drawing, under the action of a plurality of dampings on a hydraulic control pipeline, the priority oil inlet P is communicated with the priority oil outlet CF through the damp, and is communicated with the priority pressure relief port EF simultaneously, the hydraulic oil output by the hydraulic pump 1 is divided into two parts, one part enters the system through the damp, the other part is discharged through the priority pressure relief port EF, the system pressure is reduced, and part of the hydraulic oil enters the system to work.
By the mode, the steering process provides the flow of the steering demand according to the feedback of the steering load, and the energy-saving effect of the system is achieved.
Further, the hydraulic pump can adopt a load-sensitive hydraulic pump 1, a load pressure feedback port of the proportional multi-way valve 4 and a load pressure feedback port of the steering gear 5 are simultaneously communicated with a hydraulic control port L S of the load-sensitive hydraulic pump 1, the pressure of the load is output to a hydraulic control port L S of the load-sensitive hydraulic pump 1 through two load pressure feedback ports L S in the working process, namely, the hydraulic oil capable of reflecting the load pressure enters a hydraulic control port L S of the load-sensitive hydraulic pump 1 through the two load pressure feedback ports L S, the rotating speed of the load-sensitive hydraulic pump 1 is controlled according to the load feedback pressure, flow control is further realized, and the effect of saving energy of the system is achieved.
In the hydraulic steering system provided by the specific embodiment of the invention, the hydraulic steering system is further provided with the shuttle valve 7, one oil inlet a of the shuttle valve 7 is simultaneously communicated with the load pressure feedback port L S of the proportional multi-way valve 4 and the load pressure feedback port L S of the steering gear 5, the other oil inlet B of the shuttle valve 7 is communicated with the load pressure feedback port of the auxiliary system, and the oil outlet C of the shuttle valve 7 is communicated with the hydraulic control port of the load sensitive hydraulic pump 1, so that the load pressure of other auxiliary systems can also enter the hydraulic control port L S of the load sensitive hydraulic pump 1, the flow rate is controlled according to the pressure condition, and meanwhile, the shuttle valve 7 can ensure the flow direction of the hydraulic oil and improve the reliability of the equipment.
In addition to the above hydraulic steering system, the specific embodiment of the present invention further provides a traveling machine including the above hydraulic steering system, and the structure of other parts of the traveling machine refers to the prior art and is not described herein again.
Specifically, the traveling machine may be a large-sized truck, a large-sized construction machine, or an agricultural and forestry machine.
The traveling machine and the hydraulic steering system thereof according to the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A hydraulic steering system of walking machinery comprises a hydraulic pump and a steering oil cylinder (6), and is characterized by also comprising a mode switching valve, a proportional multi-way valve (4) for electrically controlling steering and a steering gear (5) for manually controlling steering;
an oil outlet of the hydraulic pump is simultaneously communicated with an oil inlet of the proportional multi-way valve (4) and an oil inlet of the steering gear (5), an oil outlet of the proportional multi-way valve (4) and an oil outlet of the steering gear (5) are simultaneously communicated with an oil tank, a left output port and a right output port of the steering gear (5) are respectively communicated with two oil inlets of the mode switching valve, a left output port and a right output port of the proportional multi-way valve (4) are respectively communicated with the other two oil inlets of the mode switching valve, and the two oil outlets of the mode switching valve are respectively communicated with two cavities of the steering oil cylinder (6);
when the steering is controlled manually, the mode switching valve is in a first working position, so that the steering gear (5) is communicated with the steering oil cylinder (6), and when the steering is controlled electrically, the mode switching valve is in a second working position, so that the proportional multi-way valve (4) is communicated with the steering oil cylinder (6);
the mode switching valve is specifically a two-position six-way electromagnetic directional valve (3), and the two-position six-way electromagnetic directional valve (3) comprises a first oil inlet, a second oil inlet, a third oil inlet, a fourth oil inlet, a first oil outlet and a second oil outlet;
the first oil inlet is communicated with a left output port of the steering gear (5), the second oil inlet is communicated with a right output port of the steering gear (5), the third oil inlet is communicated with a left output port of the proportional multi-way valve (4), the fourth oil inlet is communicated with a right output port of the proportional multi-way valve (4), the first oil outlet is communicated with a left cavity of the steering oil cylinder (6), and the second oil outlet is communicated with a right cavity of the steering oil cylinder (6);
when the two-position six-way electromagnetic directional valve (3) is located at a first working position, the first oil inlet is communicated with the first oil outlet, the second oil inlet is communicated with the second oil outlet, when the two-position six-way electromagnetic directional valve (3) is located at a second working position, the third oil inlet is communicated with the first oil outlet, and the fourth oil inlet is communicated with the second oil outlet;
the hydraulic pump is specifically a load sensitive hydraulic pump (1), and a load pressure feedback port of the proportional multi-way valve (4) and a load pressure feedback port of the steering gear (5) are simultaneously communicated with a hydraulic control port of the load sensitive hydraulic pump (1);
the hydraulic control system is characterized by further comprising a shuttle valve (7), wherein one oil inlet of the shuttle valve (7) is simultaneously communicated with a load pressure feedback port of the proportional multi-way valve (4) and a load pressure feedback port of the steering gear (5), the other oil inlet of the shuttle valve (7) is communicated with a load pressure feedback port of an auxiliary system, and an oil outlet of the shuttle valve (7) is communicated with a hydraulic control port of the load sensitive hydraulic pump (1).
2. The hydraulic steering system according to claim 1, characterized in that a filter and a plurality of relief valves are arranged in the proportional multi-way valve (4).
3. The hydraulic steering system according to claim 2, characterized in that a plurality of non-return valves and a plurality of overflow valves are provided in the steering gear (5).
4. The hydraulic steering system according to any one of claims 1 to 3, characterized by further comprising a pilot-operated priority valve (2), the pilot-operated priority valve (2) comprising a priority oil inlet, a priority oil outlet, a priority pressure relief port, and a priority pilot-operated port;
the priority oil inlet is communicated with an oil outlet of the hydraulic pump, the priority oil outlet is simultaneously communicated with an oil inlet of the proportional multi-way valve (4) and an oil inlet of the steering gear (5), the priority pressure relief port is communicated with an oil tank, and a load pressure feedback port of the proportional multi-way valve (4) and a load pressure feedback port of the steering gear (5) are simultaneously communicated with the priority hydraulic control port;
when the pressure is normal, the hydraulic control priority valve (2) is located at a first working position, the priority oil inlet is only communicated with the priority oil outlet, when the pressure is overlarge, the hydraulic control priority valve (2) is located at a second working position, the priority oil inlet is communicated with the priority oil outlet through damping, and is simultaneously communicated with the priority pressure relief port.
5. A walking machine comprising a hydraulic steering system, characterized in that the hydraulic steering system is embodied as a hydraulic steering system according to any one of claims 1 to 4.
6. The running machine of claim 5, wherein the running machine is embodied as a large truck, a large construction machine or an agricultural or forestry machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810812920.1A CN109017981B (en) | 2018-07-23 | 2018-07-23 | Walking machine and hydraulic steering system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810812920.1A CN109017981B (en) | 2018-07-23 | 2018-07-23 | Walking machine and hydraulic steering system thereof |
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| Publication Number | Publication Date |
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| CN109017981A CN109017981A (en) | 2018-12-18 |
| CN109017981B true CN109017981B (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810812920.1A Active CN109017981B (en) | 2018-07-23 | 2018-07-23 | Walking machine and hydraulic steering system thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109649481B (en) * | 2019-01-03 | 2024-07-02 | 潍柴(扬州)特种车有限公司 | Energy-saving hydraulic steering auxiliary system for vehicle |
| CN110171474A (en) * | 2019-04-26 | 2019-08-27 | 中联重科股份有限公司 | Vehicle steering system and method and vehicle |
| CN113335002A (en) * | 2021-08-05 | 2021-09-03 | 山东威猛工程机械有限公司 | Steering hydraulic system of highway and railway dual-purpose engineering machinery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4255072B2 (en) * | 2004-03-08 | 2009-04-15 | 株式会社日立製作所 | Power steering device |
| CN104670306B (en) * | 2013-11-29 | 2017-07-04 | 比亚迪股份有限公司 | Unmanned steering system for vehicle and the vehicle with the unmanned steering system |
| CN204250153U (en) * | 2014-12-05 | 2015-04-08 | 衡阳合力工业车辆有限公司 | Tractor truck and hydrostatic steering system thereof |
| CN204527297U (en) * | 2015-03-31 | 2015-08-05 | 淮安信息职业技术学院 | A kind of for agricultural vehicle auto-manual dual rotation system |
| CN107351912B (en) * | 2017-07-12 | 2019-05-10 | 徐工集团工程机械股份有限公司 | A kind of electric hydraulic steering system and paver |
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