CN108556910B - All-wheel steering system - Google Patents
All-wheel steering system Download PDFInfo
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- CN108556910B CN108556910B CN201810275983.8A CN201810275983A CN108556910B CN 108556910 B CN108556910 B CN 108556910B CN 201810275983 A CN201810275983 A CN 201810275983A CN 108556910 B CN108556910 B CN 108556910B
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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
- B62D5/061—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle provided with effort, steering lock, or end-of-stroke limiters
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Abstract
The invention discloses an all-wheel steering system which comprises a front steering system and a rear steering system, wherein the front steering system comprises a steering gear, a steering oil pump I, a front shaft steering power-assisted cylinder and an active power-assisted cylinder, and the rear steering system comprises a steering valve group, a reversing valve, a rear shaft steering power-assisted cylinder, a steering oil pump II, a follow-up power-assisted cylinder and a locking valve. The multi-axle vehicle steering system has a simple structure and obvious effect, the corner relation between the front steering system and the rear steering system is transmitted through the active power cylinder and the follow-up power cylinder, the angle control is accurate, the arrangement is convenient, the safety and the reliability are realized, various steering modes such as all-wheel steering, high-speed rear axle locking, crab running and the like are realized, and the low-speed driving flexibility and the high-speed driving stability of the multi-axle vehicle are greatly improved.
Description
Technical Field
The invention relates to a steering mechanism, belongs to the field of automobile devices, and particularly relates to an all-wheel steering system.
Background
With the development of automobile technology and road traffic systems and the continuous improvement of vehicle speed, modern transportation vehicles, engineering vehicles and military vehicles gradually develop towards large-scale and multi-axle vehicles in order to improve the transportation efficiency and meet the requirements of relevant laws and regulations on the axle load of the vehicles. Meanwhile, people have higher and higher requirements on the aspects of flexibility, portability, driving stability, working strength of drivers and the like of vehicles, and the traditional front wheel steering system cannot meet the requirements. As an effective means for improving the running performance, an all-wheel steering technique has been developed. At present, an all-wheel steering system of a vehicle mainly comprises a steering pull rod structure, electro-hydraulic proportional steering, rear axle mechanical locking and the like. Various system features are as follows: the steering pull rod structure: the occupied space is large, and the arrangement is difficult due to the space limitation; the steering mode is single, and the requirements of low speed flexibility and high speed stability cannot be met; after long-time use, the steering pull rod is easy to deform and wear to generate gaps, so that the wheel rotation angle error is increased, and the tire wear is aggravated; electro-hydraulic proportional steering: the steering in various modes is realized through electro-hydraulic proportion, but the system is complex, the cost of parts is high, and the low-temperature performance is poor; rear axle mechanical locking structure: the steering of the rear axle wheels needs to be operated manually; the noise is high when the mechanical mechanism locks and unlocks; because the rear steering system is completely independent, the driver cannot control the rotation angle of the wheels of the rear axle through the steering wheel in the all-wheel steering mode.
At present, a front shaft of an all-wheel steering system is steered through a pull rod, and a rear shaft is controlled through a mechanical locking mechanism. When the rear axle is required to be steered, the mechanical structure is pushed to unlock through pneumatic or hydraulic driving, then the power-assisted oil cylinder communicated with the rear axle pushes the wheels of the rear axle to steer, at the moment, the turning angle of the wheels of the rear axle cannot be controlled, and the wheels are steered to the maximum angle under the action of the power-assisted oil cylinder. When the rear axle is required to be locked, the rear axle wheels are rotated to the middle position, and the rear axle wheels are locked by a mechanical structure to be kept at the middle position. The main disadvantages of the rear axle mechanical locking structure are: the rear steering system is not controlled by a steering wheel, the wheels of the rear axle directly rotate to the maximum angle in an all-wheel steering mode, and the wheel turning angles of the front axle and the rear axle have no proportional relation; the unlocking success rate is low under the condition that the mechanical mechanism is stressed; the steering and locking of the rear axle needs to be carried out manually, and the automatic switching cannot be carried out.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an all-wheel steering system, a steering wheel can directly control the steering angle of a rear shaft, the steering wheel is automatically locked at a high speed, the operation is simple, and the practicability is high.
In order to achieve the purpose, the invention adopts the technical scheme that: an all-wheel steering system comprises a front steering system and a rear steering system, wherein the front steering system comprises a steering gear, a steering oil pump I, a front-shaft steering power-assisted oil cylinder and an active power-assisted cylinder; the working port A of the steering gear is connected to a steering power cylinder of a front shaft I and a front shaft II and a port L1 of an active power cylinder through pipelines, and the working port B of the steering gear is connected to the steering power cylinder of the front shaft I and the front shaft II and a port L4 of the active power cylinder through pipelines; the rear steering system comprises a steering valve group, a reversing valve, a rear axle steering power-assisted cylinder, a steering oil pump II, a follow-up power-assisted cylinder and a locking valve, wherein an a port and a B port of the reversing valve are respectively connected to an A port and a B port of a steering gear of the front steering system through pipelines, and the A port and the B port of the reversing valve are respectively connected to the steering oil cylinder of the rear axle I through pipelines; the port A and the port B of the steering valve group are respectively connected to a port L2 and a port L3 of an active power cylinder of a front steering system, an oil inlet of the steering valve group is connected to a hydraulic oil tank through a steering oil pump II, an oil outlet of the steering valve group is connected to an oil return filter, a port a and a port B of the steering valve group are respectively connected to a port A and a port B of a locking valve, a port c and a port d of the steering valve group are respectively connected to a port L8 and a port L7 of a follow-up power cylinder, and a port L6 and a port L5 of the follow-up power cylinder are respectively connected to a port a and a port B; the fixed end of the follow-up power cylinder is fixed to the rear shaft II, and the piston rod is connected to a steering knuckle arm II of the rear shaft II, so that wheels of the rear shaft II are pushed to steer; and a rear steering knuckle arm II of the rear shaft II is connected to a rear steering knuckle arm I of the rear shaft I through a steering pull rod, and the corner relation between the rear shaft and the rear shaft is transmitted through the pull rod.
Furthermore, the steering gear comprises an overflow valve, a one-way valve and a three-position four-way valve connected to the steering wheel, oil inlets of the overflow valve and the one-way valve are connected to an oil inlet of the steering gear, and oil outlets of the overflow valve and the one-way valve are connected to an oil outlet of the steering gear; and an A port of the three-position four-way valve is connected to an oil return port of the steering gear, a B port of the three-position four-way valve is connected to an oil inlet of the steering gear, a P port of the three-position four-way valve is connected to the A port of the steering gear, and a T port of the three-position four-way valve is connected to the B port.
The invention has the beneficial effects that: the corner relation between the front steering system and the rear steering system is transmitted through the active power cylinder and the follow-up power cylinder, so that the angle control is accurate, the arrangement is convenient, and the safety and the reliability are realized; by arranging the reversing valve and the locking valve, various steering modes such as all-wheel steering, high-speed rear axle locking, crab running and the like are realized, the low-speed running flexibility of the multi-axle vehicle is greatly improved, the high-speed stability is considered, meanwhile, the crab running mode is also increased, and the transverse passing capacity is improved; the mode is automatically switched between the low-speed driving mode and the high-speed driving mode without manual intervention, so that the operation intensity of a driver is reduced; the system pressure is automatically kept, the corner error is automatically compensated, and the debugging and the maintenance are convenient and quick.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is an enlarged schematic view of the front axle of the present invention;
FIG. 3 is an enlarged schematic view of the rear axle of the present invention;
FIG. 4 is a schematic view of a latch valve of the present invention;
FIG. 5 is a block diagram of the steering valve assembly of the present invention;
FIG. 6 is a block diagram of the master cylinder of the present invention;
FIG. 7 is a schematic view of a slave cylinder according to the present invention.
In the figure: 1. the steering gear comprises a steering gear, 101, an overflow valve, 102, a one-way valve, 103, a three-position four-way valve, 104, a steering wheel, 2, steering oil pumps I, 3, a hydraulic oil tank, 4, an oil return filter, 5, a front shaft I, 501, a right steering cylinder I, 502, a left steering cylinder I, 503, a front steering knuckle arm I, 6, a front shaft II, 601, a steering cylinder II, 602, a front steering knuckle arm II, 7, an active power cylinder, 8, a reversing valve, 9, a rear shaft I, 901, a left steering cylinder III, 902, a right steering cylinder III, 903, a rear steering knuckle arm I, 10, a rear shaft II, 11, a slave power cylinder, 12, a steering rod, 13, a locking valve, 1301, a two-position two-way electromagnetic reversing valve I, 1302, a manual reversing valve I, 1303, an overflow valve I, 14, a steering valve group, a 1401, an overflow valve II, an overflow valve III, 1402, 1403, V, 1404, a manual reversing valve, 1405, a manual reversing valve III, 1406, the hydraulic steering system comprises an overflow valve IV, 1407, a two-position two-way electromagnetic directional valve II, a two-position two-way electromagnetic directional valve 1408, a manual directional valve II, a manual directional valve 15, a rear steering knuckle arm II, a rear steering knuckle arm 16 and a steering oil pump II.
Detailed Description
The invention will be further explained in the following with reference to the attached drawings by means of a four-axle vehicle.
As shown in fig. 1, an all-wheel steering system comprises a front steering system and a rear steering system, wherein the front steering system comprises a steering gear 1, a steering oil pump i 2, a front-axle steering power cylinder and an active power cylinder 7, an oil inlet of the steering gear 1 is connected with a hydraulic oil tank 3 through the steering oil pump i 2, and an oil return port is also connected to the hydraulic oil tank 3 through an oil return filter 4; the working port A of the steering gear 1 is connected to the steering power cylinder of the front shaft I5 and the front shaft II 6 and the port L1 of the driving power cylinder 7 through pipelines, and the working port B of the steering gear 1 is connected to the steering power cylinder of the front shaft I5 and the front shaft II 6 and the port L4 of the driving power cylinder 7 through pipelines; the rear steering system comprises a steering valve group 14, a reversing valve 8, a rear axle steering power-assisted cylinder, a steering oil pump II 16, a follow-up power-assisted cylinder 11 and a locking valve 13, wherein an opening a and an opening B of the reversing valve 8 are respectively connected to an opening A and an opening B of a steering gear 1 of the front steering system through pipelines, and an opening A and an opening B of the reversing valve 8 are respectively connected to the steering cylinder of a rear axle I9 through pipelines; an A port and a B port of the steering valve group 14 are respectively connected to an L2 port and an L3 port of an active power cylinder 7 of a front steering system, an oil inlet of the steering valve group 14 is connected to a hydraulic oil tank 3 through a steering oil pump II 16, an oil outlet of the steering valve group 14 is connected to an oil return filter 4, an a port and a B port of the steering valve group 14 are respectively connected to an A port and a B port of a locking valve 13, a c port and a d port of the steering valve group 14 are respectively connected to an L8 port and an L7 port of a follow-up power cylinder 11, and an L6 port and an L5 port of the follow-up power cylinder 11 are respectively connected to an a port and a B port of the locking; the fixed end of the follow-up power cylinder 11 is fixed to the rear axle II 10, and the piston rod is connected to a steering knuckle arm II 15 of the rear axle II 10, so that the wheels of the rear axle II 10 are pushed to steer; the rear knuckle arm II 15 of the rear axle II 10 is connected to the rear knuckle arm I903 of the rear axle I9 through a steering pull rod 12, and the rotation angle relation between the rear axle 9 and the rear axle 10 is transmitted through the steering pull rod 12.
Further, the steering gear 1 comprises an overflow valve 101, a one-way valve 102 and a three-position four-way valve 103 connected to a steering wheel 104, oil inlets of the overflow valve 101 and the one-way valve 102 are both connected to an oil inlet of the steering gear 1, and oil outlets of the overflow valve 101 and the one-way valve 102 are both connected to an oil outlet of the steering gear 1; the three-position four-way valve 103 has an A port connected to an oil return port of the steering gear 1, a B port connected to an oil inlet of the steering gear 1, a P port connected to the A port of the steering gear 1, and a T port connected to the B port of the steering gear 1.
Further, as shown in fig. 2, the front axle i 5 includes a left-turning cylinder i 502 and a right-turning cylinder i 501, the bottoms of which are hinged to the front axle i 5, and the piston rods of which are respectively hinged to both ends of a front knuckle arm i 503, an opening a of the steering gear 1 is connected to a rodless cavity of the left-turning cylinder i 502 and a rod cavity of the right-turning cylinder i 501 through pipelines, and an opening B of the steering gear 1 is connected to a rod cavity of the left-turning cylinder i 502 and a rodless cavity of the right-turning cylinder i 501 through pipelines; the front axle II 6 comprises a steering oil cylinder II 601 with the bottom hinged to the front axle II 6 and the piston rod hinged to one end of a front steering knuckle arm II 602, an A port of the steering gear 1 is connected to a rodless cavity of the steering oil cylinder II 601 through a pipeline, and a B port of the steering gear 1 is connected to a rod cavity of the steering oil cylinder II 601 through a pipeline.
Further, as shown in fig. 3, the rear axle i 9 includes a left-turning cylinder iii 901 and a right-turning cylinder iii 902, the bottoms of which are hinged to the rear axle i 9, and the piston rods of which are hinged to both ends of the rear knuckle arm i 903, respectively, the port a of the reversing valve 8 is connected to the rod cavity of the left-turning cylinder iii 901 and the rod-free cavity of the right-turning cylinder iii 902 through a pipeline, and the port B of the reversing valve 8 is connected to the rod-free cavity of the left-turning cylinder iii 901 and the rod cavity of the right-turning cylinder iii 902 through a pipeline.
Further, the locking valve 13 comprises a two-position two-way electromagnetic directional valve I1301, wherein one end of the two-position two-way electromagnetic directional valve I1301 is connected to the port a, the other end of the two-way electromagnetic directional valve I1302 is connected to the port A of the manual directional valve I1302, the port T of the manual directional valve I1302 is connected to the port A of the locking valve, the port A of the locking valve is connected to the port B of the locking valve through an overflow valve I1303, and the port B of the locking valve is also connected to the port B and the port P of the manual directional valve I1302; the end a of the locking valve is also connected with the end b of the locking valve.
Further, the steering valve group 14 comprises a B end of a manual reversing valve II 1408 connected to the A port, the P port and the T port of the manual reversing valve II 1408 are respectively connected to a B port, a c port and a d port of the steering valve group, the A port of the steering valve group is connected to a T port of a manual reversing valve III 1404 through an overflow valve II 1401, the B port of the steering valve group is connected to the T port of the manual reversing valve III 1404 through an overflow valve III 1402, the A port of the manual reversing valve III 1404 is connected to a B port of a manual reversing valve IV 1405 and a port of the steering valve group, and the B port of the IV manual reversing valve III 1404 is connected to a B port of the steering valve group; the A end of the manual reversing valve IV 1405 is connected to the T port of the steering valve group, the P end of the manual reversing valve IV 1405 is connected to the T port of the steering valve group through an overflow valve IV 1406, and the T end of the manual reversing valve IV 1405 is connected to the d port of the steering valve group; the port P of the steering valve group is connected to the port T of the steering valve group through an overflow valve V1403, and the port P of the steering valve group is connected to the end P of a manual reversing valve III 1404; the port T of the steering valve group is also connected to the end T of a manual reversing valve III 1404; the port c of the steering valve group is also connected to the port d of the steering valve group through a two-position two-way electromagnetic directional valve 1407.
Preferably, the reversing valve 8 is a 3-to-4-way valve, and in the middle position, the ends a and b are not conducted, and the end A, B is conducted; when the device is at the upper position, the a-B end is conducted, and the B-A end is conducted; when the switch is at the lower position, the a-A end is conducted, and the B-B end is conducted.
Further, as shown in fig. 6 and 7, the specific structural details of the active power cylinder 7 and the slave power cylinder 11 are disclosed in patent No. 201110457820.X, which is named as a four-axle automobile chassis and an invention patent of an automobile crane with the chassis.
The working principle of the invention is as follows: the active power cylinder 7 is arranged in a front steering system, the stroke of the active power cylinder keeps a proportional relation with the rotating angle of a steering wheel 104, the follow-up power cylinder 11 is arranged in a rear steering system, and working cavities of the active power cylinder 7 and the follow-up power cylinder 11 are connected through a pipeline; the piston rod of the driving power cylinder 7 generates displacement along with the rotation of the steering wheel, and under the transmission action of incompressible hydraulic oil, the piston rod of the follow-up power cylinder 11 generates corresponding displacement in proportion, so that wheels of a rear axle II 10 are pushed to generate a corner; the rear steering knuckle arm I903 of the rear shaft I9 is connected with the rear steering knuckle arm II 15 of the rear shaft II 10 through the steering pull rod 12, and the rotating angle of the wheels of the rear shaft II 10 is transmitted to the wheels of the rear shaft I9 in a proportional relation.
When the engine is started, the locking valve 13 connected with the follow-up power cylinder 11 is electrified to release the locking of the rear axle. When the steering wheel 104 turns left, high-pressure oil enters an L4 port of the driving power-assisted cylinder 7 through a port B of the steering gear 1, a piston rod is pushed to move towards the direction of a front shaft I5 shown in the figure, hydraulic oil in a port L3 enters an L7 port of a follow-up power-assisted cylinder 11 through a steering valve group 14, the piston rod of the follow-up power-assisted cylinder 11 pushes a rear steering knuckle arm II 15 of a rear shaft II 10 towards the left side shown in the figure, and wheels of the rear shaft II 10 rotate towards the right side according to a certain angular relationship; similarly, when the steering wheel 104 turns right, oil liquid in an L2 port of the driving power cylinder 7 enters an L8 port of the follow-up power cylinder 11 to push wheels of a rear axle II 10 to turn left; the rear axle II 10 steers and meanwhile pushes the wheels of the rear axle I9 to steer through the steering pull rod 12.
When the vehicle runs until the speed of the vehicle is greater than a set value, the electromagnetic valve in the steering valve group 14 is electrified, so that ports L2 and L3 of the driving power cylinder 7 are mutually communicated, the relation transmission between the driving power cylinder 7 and the follow-up power cylinder 11 is disconnected, meanwhile, the locking valve 13 locks the rear axle through ports L5 and L6 of the follow-up power cylinder 11, wheels of the rear axle are kept in a middle straight-going position, and the high-speed rear axle locking function is realized.
When the running speed of the vehicle is reduced to be lower than a set value, the active power cylinder 7 is communicated with the follow-up power cylinder 11 through the steering valve group 14, and meanwhile, the locking of a rear shaft is released, so that the whole vehicle enters a low-speed all-wheel steering mode again.
When a crab switch is pressed, the communication relation between the driving power cylinder 7 and the follow-up power cylinder 11 is switched by the steering valve group 14, so that the port L2 is communicated with the port L7, and the port L3 is communicated with the port L8; at this time, the rear axle wheels and the front axle wheels keep rotating in the same direction, so that the crab walking mode is realized.
In conclusion, the steering angle control device is simple in structure and obvious in effect, the corner relation between the front steering system and the rear steering system is transmitted through the active power cylinder and the follow-up power cylinder, the angle control is accurate, the arrangement is convenient, and the steering angle control device is safe and reliable; by arranging the reversing valve and the locking valve, various steering modes such as all-wheel steering, high-speed rear axle locking, crab walking and the like are realized, the low-speed running passing performance of the multi-axle vehicle is greatly improved, the high-speed stability is considered, meanwhile, the crab walking mode is also increased, and the transverse passing capacity is improved; the mode is automatically switched between the low-speed driving mode and the high-speed driving mode without manual intervention, so that the operation intensity of a driver is reduced; the system pressure is automatically kept, the corner error is automatically compensated, and the debugging and the maintenance are convenient and quick.
Claims (6)
1. The all-wheel steering system is characterized by comprising a front steering system and a rear steering system, wherein the front steering system comprises a steering gear (1), a steering oil pump I (2), a front-axle steering power-assisted cylinder and an active power-assisted cylinder (7), an oil inlet of the steering gear (1) is connected with a hydraulic oil tank (3) through the steering oil pump I (2), and an oil return port is also connected to the hydraulic oil tank (3) through an oil return filter (4); the working port A of the steering gear (1) is connected to a steering power cylinder of a front shaft I (5) and a front shaft II (6) and a port L1 of an active power cylinder (7) through pipelines, and the working port B of the steering gear (1) is connected to the steering power cylinder of the front shaft I (5) and the front shaft II (6) and a port L4 of the active power cylinder (7) through pipelines; the rear steering system comprises a steering valve group (14), a reversing valve (8), a rear axle steering power cylinder, a steering oil pump II (16), a follow-up power cylinder (11) and a locking valve (13), wherein an a port and a B port of the reversing valve (8) are respectively connected to an A port and a B port of a steering gear (1) of the front steering system through pipelines, and the A port and the B port of the reversing valve (8) are respectively connected to the steering oil cylinder of the rear axle I (9) through pipelines; an A port and a B port of the steering valve group (14) are respectively connected to an L2 port and an L3 port of a front steering system driving power cylinder (7), an oil inlet of the steering valve group (14) is connected to a hydraulic oil tank (3) through a steering oil pump II (16), an oil outlet of the steering valve group (14) is connected to a return oil filter (4), an a port and a B port of the steering valve group (14) are respectively connected to an A port and a B port of a locking valve (13), a c port and a d port of the steering valve group (14) are respectively connected to an L8 port and an L7 port of a follow-up power cylinder (11), and an L6 port and an L5 port of the follow-up power cylinder (11) are respectively connected to the a port and the B port of the locking valve (13); the fixed end of the servo cylinder (11) is fixed to the rear axle II (10), and a piston rod is connected to a rear steering knuckle arm II (15) of the rear axle II (10); and a rear steering knuckle arm II (15) of the rear axle II (10) is connected to a rear steering knuckle arm I (903) of the rear axle I (9) through a steering pull rod (12).
2. An all-wheel steering system according to claim 1, wherein the steering gear (1) comprises an overflow valve (101), a one-way valve (102) and a three-position four-way valve (103) connected to a steering wheel (104), oil inlets of the overflow valve (101) and the one-way valve (102) are both connected to an oil inlet of the steering gear (1), and oil outlets of the overflow valve (101) and the one-way valve (102) are both connected to an oil outlet of the steering gear (1); and an A port of the three-position four-way valve (103) is connected to an oil return port of the steering gear (1), a B port of the three-position four-way valve is connected to an oil inlet of the steering gear (1), a P port of the three-position four-way valve is connected to the A port of the steering gear (1), and a T port of the three-position four-way valve is connected to the B port of the steering gear (1.
3. The all-wheel steering system according to claim 1, wherein the front axle I (5) comprises a left-turning cylinder I (502) and a right-turning cylinder I (501) which are hinged to the front axle I (5) at the bottom and are hinged to two ends of a front knuckle arm I (503) through piston rods, the port A of the steering gear (1) is connected to a rodless cavity of the left-turning cylinder I (502) and a rod cavity of the right-turning cylinder I (501) through pipelines, and the port B of the steering gear (1) is connected to a rod cavity of the left-turning cylinder I (502) and a rodless cavity of the right-turning cylinder I (501) through pipelines; the front axle II (6) comprises a steering oil cylinder II (601) with the bottom hinged to the front axle II (6) and the piston rod hinged to one end of a front steering knuckle arm II (602), wherein an A port of the steering gear (1) is connected to a rodless cavity of the steering oil cylinder II (601) through a pipeline, and a B port of the steering gear is connected to a rod cavity of the steering oil cylinder II (601) through a pipeline.
4. The all-wheel steering system according to claim 1, wherein the rear axle I (9) comprises a left-turning cylinder III (901) and a right-turning cylinder III (902) which are hinged to the rear axle I (9) at the bottom and hinged to two ends of a rear knuckle arm I (903) at the piston rod, respectively, an A port of the reversing valve (8) is connected to a rod cavity of the left-turning cylinder III (901) and a rodless cavity of the right-turning cylinder III (902) through pipelines, and a B port of the reversing valve (8) is connected to a rodless cavity of the left-turning cylinder III (901) and a rod cavity of the right-turning cylinder III (902) through pipelines.
5. The all-wheel steering system according to claim 1, wherein the locking valve (13) comprises a two-position two-way electromagnetic reversing valve I (1301) with one end connected to the port a and the other end connected to the port A of a manual reversing valve I (1302), the port T of the manual reversing valve I (1302) is connected to the port A of the locking valve, the port A of the locking valve is connected to the port B of the locking valve through an overflow valve I (1303), and the port B of the locking valve is further connected to the port B and the port P of the manual reversing valve I (1302); the end a of the locking valve is also connected with the end b of the locking valve.
6. The all-wheel steering system according to claim 1, wherein the steering valve group (14) comprises a port B of a manual reversing valve II (1408) connected to a port A, the port P and the port T of the manual reversing valve II (1408) are respectively connected to a port B, a port c and a port d of the steering valve group, the port A of the steering valve group is connected to the port T of a manual reversing valve III (1404) through a relief valve II (1401), the port B of the steering valve group is connected to the port T of a manual reversing valve III (1404) through a relief valve III (1402), the port A of the manual reversing valve III (1404) is connected to a port B of a manual reversing valve IV (1405) and a port a of the steering valve group, and the port B of the manual reversing valve III (1404) is connected to the port B of the steering valve group; the end A of the manual reversing valve IV (1405) is connected to a port T of the steering valve group, the end P of the manual reversing valve IV (1405) is connected to the port T of the steering valve group through an overflow valve IV (1406), and the end T of the manual reversing valve IV (1405) is connected to a port d of the steering valve group; the port P of the steering valve group is connected to the port T of the steering valve group through an overflow valve V (1403), and the port P of the steering valve group is connected to the end P of a manual reversing valve III (1404); the port T of the steering valve group is also connected to the end T of a manual reversing valve III (1404); and the port c of the steering valve group is also connected to the port d of the steering valve group through a two-position two-way electromagnetic directional valve II (1407).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810275983.8A CN108556910B (en) | 2018-03-30 | 2018-03-30 | All-wheel steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810275983.8A CN108556910B (en) | 2018-03-30 | 2018-03-30 | All-wheel steering system |
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| Publication Number | Publication Date |
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| CN108556910A CN108556910A (en) | 2018-09-21 |
| CN108556910B true CN108556910B (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810275983.8A Active CN108556910B (en) | 2018-03-30 | 2018-03-30 | All-wheel steering system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111845927B (en) * | 2019-04-22 | 2022-07-22 | 中国北方车辆研究所 | Rear axle steering pump assembly and steering system |
| CN111619648B (en) * | 2019-04-22 | 2021-07-06 | 中国北方车辆研究所 | Steering wheel, steering gear assembly and steering system |
| CN110466600A (en) * | 2019-08-22 | 2019-11-19 | 徐州重型机械有限公司 | A kind of control valve group, control valve, steering system and crane |
| CN112977600B (en) * | 2019-12-18 | 2022-05-24 | 北汽福田汽车股份有限公司 | Steering system and vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004005823A1 (en) * | 2003-02-17 | 2004-09-02 | Man Sonderfahrzeuge Ag | Multi-axle heavy goods vehicle has sender cylinder piston rod with larger diameter/cross-section between 2 pistons, smaller piston surfaces in sender pressure chambers than control pressure chambers |
| CN201907559U (en) * | 2010-12-06 | 2011-07-27 | 徐州重型机械有限公司 | Six-axle automobile chassis hoisting machine and steering control system thereof |
| CN102424001A (en) * | 2011-12-30 | 2012-04-25 | 徐州重型机械有限公司 | Four-axle automobile chassis and automobile crane with same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03292260A (en) * | 1990-04-10 | 1991-12-24 | Mitsubishi Automob Eng Co Ltd | Four-wheel steering device for automobile |
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2018
- 2018-03-30 CN CN201810275983.8A patent/CN108556910B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004005823A1 (en) * | 2003-02-17 | 2004-09-02 | Man Sonderfahrzeuge Ag | Multi-axle heavy goods vehicle has sender cylinder piston rod with larger diameter/cross-section between 2 pistons, smaller piston surfaces in sender pressure chambers than control pressure chambers |
| CN201907559U (en) * | 2010-12-06 | 2011-07-27 | 徐州重型机械有限公司 | Six-axle automobile chassis hoisting machine and steering control system thereof |
| CN102424001A (en) * | 2011-12-30 | 2012-04-25 | 徐州重型机械有限公司 | Four-axle automobile chassis and automobile crane with same |
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| CN108556910A (en) | 2018-09-21 |
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