CN110901755B

CN110901755B - Steering control valve

Info

Publication number: CN110901755B
Application number: CN201911367114.9A
Authority: CN
Inventors: 李孙建; 谢丽华; 胡稔松
Original assignee: Taizhou Yas Steering Gear Co ltd
Current assignee: Taizhou Yas Steering Gear Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2024-05-28
Anticipated expiration: 2039-12-26
Also published as: CN110901755A

Abstract

The invention provides a steering control valve, and belongs to the technical field of automobile equipment. The steering control valve solves the problems that the existing steering control valve still causes a waggling feeling when an automobile runs at a high speed and the like. The steering control valve comprises a valve body, wherein a valve sleeve is arranged in the valve body, a valve core capable of rotating relatively is arranged in the valve sleeve, an oil control valve cavity is formed between the outer side surface of the valve core and the inner side surface of the valve sleeve, an oil inlet hole, an oil return hole, a left oil passing hole and a right oil passing hole are formed in the valve body, the valve sleeve comprises an adjusting part, an adjusting cavity is formed between the outer side surface of the adjusting part and the inner side surface of the valve body, a bypass channel for communicating the oil inlet hole and the adjusting cavity is formed in the valve body, a flow control valve is connected in the bypass channel, a plurality of through holes are uniformly formed in the adjusting part along the circumferential direction, the inner ends of the through holes are communicated with the oil return hole, movable steel balls are arranged in the through holes, and the inner side parts of the steel balls can be abutted against the outer side surfaces of the valve core. The steering control valve can more effectively prevent the problem of drifting when the automobile runs at a high speed and turns.

Description

Steering control valve

Technical Field

The invention belongs to the technical field of automobile equipment, and relates to a steering control valve.

Background

Steering systems refer to devices for changing or maintaining the direction of travel or reverse travel of a vehicle, and the function of the steering system is to control the direction of travel of the vehicle according to the wishes of the driver. The steering system comprises a mechanical steering system and a power steering system, wherein the mechanical steering system takes the physical strength of a driver as a steering energy source, and the power steering system takes the physical strength of the driver and the power of an engine as the steering energy source, so that the power steering system is commonly used on automobiles at present.

Hydraulic power steering systems are a common type of power steering system that includes a steering gear, a steering cylinder, a steering control valve, an oil storage tank, a steering pump, and the like. The steering gear is a gear shaft and rack type steering gear and comprises a gear shaft and a rack which are meshed with each other, the steering control valve comprises a valve body, a valve sleeve and a valve core, the valve sleeve and the valve sleeve can rotate relatively, an oil control valve cavity is arranged between the valve core and the valve sleeve, the upper end of the valve core is connected with a steering wheel, the lower end of the valve core is connected with the gear shaft, a piston rod of a steering power cylinder is connected with the rack, and the steering power cylinder, the steering control valve, the steering booster pump and the oil storage tank are communicated through an oil way. The engine is used as a power source, the engine drives the steering power pump to work, the steering power pump pumps hydraulic oil in an oil storage tank into the steering control valve, the steering wheel drives the valve core to rotate, on one hand, the gear shaft drives the rack to move, on the other hand, the valve core and the valve sleeve relatively rotate, the opening of the valve port of the oil control valve cavity changes, so that hydraulic oil enters the steering power cylinder after passing through the oil control valve cavity, the driving force applied to the piston of the steering power cylinder is caused, and the tire steering is driven by the movement of the piston of the steering power cylinder and the movement of the rack. In the steering process of the vehicle, steering action is still completed by a driver, hydraulic pressure of the power steering system only plays an auxiliary role in steering, driving force on a gear shaft is main driving force, and driving force in a steering power cylinder is auxiliary driving force. When the automobile runs at a low speed for steering or is in idle parking for steering, the steering power cylinder is required to provide a larger auxiliary driving force to enable the steering wheel to rotate lightly due to larger friction force between the wheels and the ground; when the automobile runs at a high speed and turns, the steering power cylinder is required to reduce auxiliary driving force, so that the steering wheel is prevented from rotating too lightly, and the problem of 'waggling' caused by the loss of road feel of the automobile is avoided.

The Chinese patent literature data discloses and proposes a dual-characteristic rotary valve of an automobile power steering gear, [ application number: CN00210849.6; bulletin number: CN 2406896Y is formed from torsion bar, valve core, valve sleeve, valve body and electromagnetic valve, etc., the valve grooves on the external surface of valve core and internal surface of valve sleeve are formed into high-speed valve port and low-speed valve port, between the high-speed valve port and low-speed valve port a bypass hole is set, the bypass holes on the left and right sides are connected together by means of bypass loop, on the bypass loop an electromagnetic valve is set, and the on-off of bypass loop is controlled by means of switch of electromagnetic valve. When the electromagnetic valve is closed in use, hydraulic oil can only flow back through the steering power cylinder, the pressure of the hydraulic oil is fully acted on the steering power cylinder, and the steering auxiliary driving force is large, so that the torque required by the rotation of the steering wheel is reduced; when the electromagnetic valve is opened, hydraulic oil can flow back through the bypass loop, only part of the hydraulic oil acts on the steering power cylinder, the steering auxiliary driving force is reduced, and therefore the torque required by rotation of the steering wheel is increased. However, when the oil pressure is increased by the same amount, the amount of torque increase required for steering wheel rotation is substantially unchanged when the solenoid valve is closed and opened, that is, the torque required for steering wheel rotation is often increased during high-speed running of the automobile, but the increased amount is still insufficient, and a waggling feeling is still caused.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides a steering control valve, and solves the technical problem that the existing steering control valve still causes a floating feel when an automobile runs at a high speed.

The aim of the invention can be achieved by the following technical scheme:

The utility model provides a steering control valve, includes the valve body, install the valve pocket in the inner chamber of valve body, be provided with the case of relative rotation in the valve pocket, be provided with the accuse oil valve pocket between the medial surface of case and valve pocket, be provided with the inlet port, the oil return hole, left oilhole and the right oilhole that all communicate with accuse oil valve pocket on the valve body, characterized in that, the valve pocket includes the regulating part, have the annular regulating cavity that is between the lateral surface of regulating part and the medial surface of valve body, be provided with the bypass passageway that communicates inlet port and regulating cavity on the valve body, bypass passageway internal connection has the flow control valve, evenly be provided with a plurality of through-holes along circumference on the regulating part, the inner and the oil return hole intercommunication of through-hole, install movable steel ball in the through-hole, the medial part of steel ball can support and lean on the lateral surface of case.

The steering control valve is arranged in the steering system, the upper end of the valve core is connected with the steering wheel, the lower end of the valve core is connected with the gear shaft of the steering gear, the oil inlet hole of the steering control valve is communicated with the steering power pump, the oil return hole of the steering control valve is communicated with the oil storage tank, the left oil passing hole is communicated with the left cavity of the steering power cylinder, and the right oil passing hole is communicated with the right cavity of the steering power cylinder. After the automobile is started, the steering booster pump is connected with the engine, and the engine rotates to drive the steering booster pump to rotate, so that hydraulic oil in the oil storage tank is pumped into the oil control valve cavity through the oil inlet hole. When not turning, the pumped hydraulic oil directly returns to the oil storage tank through the oil return hole. When the steering wheel rotates to steer, the valve core rotates, the valve core and the valve sleeve rotate relatively to change the valve port size in the oil control valve cavity, hydraulic oil enters the steering power cylinder through the left oil passing hole or the right oil passing hole, so that a piston rod of the steering power cylinder moves, the piston rod can assist in driving the rack to move, and meanwhile, a gear shaft of the steering gear drives the rack to move, so that steering of wheels is realized. The driving force on the gear shaft is the main driving force, and the driving force in the steering cylinder is the auxiliary driving force.

When the automobile is in low-speed running steering or idle-stop steering, the flow regulating valve in the bypass channel is opened at a small flow or is in a closed state, oil pressure generated by the steering booster pump basically acts on the steering booster cylinder, so that the auxiliary driving force generated by the steering booster cylinder reduces the force required by the steering gear shaft to drive the rack to move, namely the torsion force required by rotating the steering wheel is reduced, and the steering wheel is light to rotate when the automobile is in low-speed running steering or idle-stop steering.

When the automobile is driven and steered at a high speed, the opening of the flow regulating valve in the bypass channel is increased, part of hydraulic oil pumped into the steering control valve by the steering booster pump enters the oil control valve cavity and acts on the steering power cylinder, and the other part enters the regulating cavity through the bypass channel and acts on the steel ball and then returns to the oil storage tank from the oil return hole after passing through the through hole. On the one hand, because only part of hydraulic oil pumped by the steering power pump enters the oil control valve cavity to act on the steering power cylinder, the auxiliary driving force on the steering power cylinder is reduced compared with that when a bypass passage is not opened, and therefore the torsion force required by the rotation of the steering wheel is increased compared with that when the bypass passage is not opened. On the other hand, the other part of hydraulic oil pumped by the steering booster pump is introduced into the adjusting cavity and acts on the steel ball, the hydraulic oil enables the steel ball uniformly arranged on the periphery of the valve sleeve to hold the valve core tightly, the rotation resistance of the valve core is increased, the valve core is difficult to rotate relative to the valve sleeve, the opening degree of a valve port in the oil control valve cavity cannot be large, and therefore the oil pressure entering the steering booster pump can be further reduced, and the torsion force required by rotation of the steering wheel is further increased. Therefore, in the high-speed running process of the automobile, the auxiliary driving force on the steering power cylinder is reduced by increasing the bypass passage at the oil inlet to reduce the oil inlet flow, and meanwhile, the auxiliary driving force on the steering power cylinder is further reduced by reducing the flow flowing out of the left oil passing hole or the right oil passing hole by tightly holding the valve core by the steel ball, so that the torsion force required by the steering wheel is greatly increased, and the problem of floating when the automobile runs and turns at a high speed is more effectively prevented.

In the steering control valve, the outer side surface of the valve core is provided with the caulking grooves corresponding to the through holes one by one, the side wall surfaces on two sides of the caulking grooves are respectively provided with a contact surface which is obliquely arranged, and the inner side part of the steel ball can be embedded into the caulking grooves and is propped against at least one contact surface.

When the opening degree of the flow regulating valve is small or closed, the outer side part of the steel ball is subjected to small pressure or is not subjected to the action of oil pressure, and because the steel ball is spherical and can move in the through hole, namely, the steel ball can rotate and can move in the through hole, the contact surface of the caulking groove is obliquely arranged, so that the steel ball can freely enter and exit the caulking groove, the inner side part of the steel ball is embedded into the caulking groove, the rotation resistance of the valve core cannot be increased, and the setting of the caulking groove cannot increase the torsion force required by the steering wheel when the automobile runs at a low speed or is in idle stop steering, so that the steering is in a light state. When the flow regulating valve is opened and enlarged, the outer side part of the steel ball is acted by large oil pressure, the steel ball is stressed to approach the valve core and lean against the contact surface, and because the contact surface is inclined, the valve core rotates to overcome the friction resistance of the rotation of the steel ball and push the steel ball outwards, compared with the case that the steel ball directly leans against a cylindrical surface, the valve core rotates to overcome larger resistance, so that the valve core can turn to open a valve port in an oil control valve cavity relative to the valve sleeve to be more difficult, the flow flowing out of the left oil passing hole or the right oil passing hole is further reduced, the oil pressure entering the steering power pump is further reduced, the torsion force required by the rotation of the steering wheel can be further increased, and the problem of floating when the automobile is steered at high speed is more effectively prevented.

In the steering control valve, an annular fixing groove intersecting with the through hole is formed in the outer side face of the adjusting part, a clamping ring is fixed in the fixing groove, and a movable gap is formed between the clamping ring and the steel ball.

The arrangement of the clamping ring can prevent the steel ball from falling out of the through hole, a movable gap is formed between the clamping ring and the steel ball, the steel ball can be ensured to move in the caulking groove, the failure or unadjustable auxiliary driving force of the power steering cylinder, which is caused by incapability of relatively rotating the valve core and the valve sleeve due to the clamping of the steel ball in the caulking groove, is prevented, the use stability of the steering control valve is ensured, and the portability of low-speed driving steering and idle-speed parking steering is ensured.

In the steering control valve, an oil passing cavity is formed between the inner side surface of the adjusting part and the outer side surface of the valve core, the oil passing cavity is located above the oil control valve cavity, the oil passing cavity is separated from the oil control valve cavity through a sealing ring, an opening is formed in the upper end of the oil passing cavity, and the oil passing cavity is communicated with the oil return hole through the opening.

The oil passing cavity is separated from the oil control valve cavity through the sealing ring, so that hydraulic oil in the oil passing cavity is prevented from entering the oil control valve cavity, the flow control effect of the flow control valve is ensured, the use state of the steering control valve is stable, and the problem of floating during high-speed running is avoided. The oil passing cavity is positioned above the oil control valve cavity, and oil returns through an opening at the upper end of the oil passing cavity, so that the hydraulic oil flowing in from the bypass channel can be ensured to generate pressure on the steel ball, and the working effectiveness of the steering control valve is ensured.

In the steering control valve, a backflow cavity is arranged above the adjusting part in the valve body, and a backflow channel which is communicated with the backflow cavity and the oil return hole is arranged on the side wall of the valve body. The arrangement ensures that the hydraulic oil flowing out of the bypass channel can generate pressure on the steel ball, and the working effectiveness of the steering control valve is ensured.

In the steering control valve, the adjusting part is further provided with an additional hole for communicating the adjusting cavity and the oil passing cavity.

The hydraulic oil in the adjusting cavity can enter the oil passing cavity through the additional hole, the situation that the hydraulic oil caused when the through hole is blocked by the steel ball and cannot flow back is avoided, the hydraulic oil can flow back from the oil passing cavity, and the hydraulic oil at the oil inlet can be split, so that the hydraulic oil entering the oil control valve cavity from the oil inlet can be reduced, the auxiliary driving force in the steering power cylinder is reduced, the torsion force required by the rotation of the steering wheel is increased, and the problem that the automobile floats when running and steering at a high speed is effectively prevented.

In the steering control valve, an inner hole is formed in the valve core, the lower end of the inner hole is communicated with the oil return hole, and an auxiliary hole I communicated with the oil control valve cavity and the inner hole and an auxiliary hole II communicated with the oil passing cavity and the inner hole are formed in the side wall of the valve core.

The redundant hydraulic oil in the oil control valve cavity flows back as soon as possible through the auxiliary hole I and the inner hole, and the redundant hydraulic oil in the oil passing cavity flows back as soon as possible through the auxiliary hole II and the inner hole, so that the hydraulic pressure in the steering control valve is ensured to be in a safe range, overpressure is avoided, and the steering control valve is safe and stable to use.

Compared with the prior art, the invention has the following advantages:

The valve body is provided with the bypass channel which is communicated with the oil inlet hole and the adjusting cavity, the flow adjusting valve is arranged in the bypass channel, the valve sleeve is provided with the steel ball, and the steel ball can tightly hold the valve core under the action of oil pressure, so that the auxiliary driving force of the steering power cylinder can be greatly reduced, and the problem that the automobile drifts when running and steering at a high speed can be effectively prevented. The valve core is provided with the caulking groove, so that the steel ball is embedded into the caulking groove and is abutted against the inclined abutting surface, and the problem of floating when the automobile runs and turns at a high speed is further prevented. The additional hole is arranged to ensure the backflow, and the backflow cavity is arranged above the adjusting part to ensure that the steel ball holds the valve core tightly, so that the steering control valve works stably.

Drawings

FIG. 1 is a perspective view of the present steering control valve;

FIG. 2 is a split view of the present steering control valve;

FIG. 3 is a cross-sectional view of the present steering control valve;

FIG. 4 is a cross-sectional view of the present steering control valve at the oil control valve cavity;

FIG. 5 is a cross-sectional view of the present steering control valve at the steel ball;

FIG. 6 is a cross-sectional view of the junction of the spool and the gear shaft in the present steering control valve;

FIG. 7 is a schematic illustration of the present steering control valve installed in a steering system;

Fig. 8 is a schematic diagram of the operation principle of the present steering control valve.

In the figure, 1, a valve body; 1a, an oil inlet hole; 1b, oil return holes; 1c, a left oil passing hole; 1d, right oil passing hole; 1e, a reflux cavity; 1f, bypass channel; 1g, a return channel; 2. a valve sleeve; 2a, an oil control part; 2a1, left oil passing groove; 2a2, an oil inlet groove; 2a3, right oil passing groove; 2a4, an oil return groove; 2a5, left oil passing through holes; 2a6, an oil inlet through hole; 2a7, right oil passing through holes; 2a8, an oil return through hole; 2b, an adjusting part; 2b1, a regulating chamber; 2b2, through holes; 2b3, fixing groove; 2b4, snap ring; 2b5, a movable gap; 2c, auxiliary holes III; 2d, an additional hole; 3. a valve core; 3a, inner holes; 3b, a limiting part; 3b1, left steering limit surface; 3b2, right steering limit surface; 3b3, left turn clearance; 3b4, right turn movement gap; 3c, caulking grooves; 3c1, contact surface; 3d, auxiliary hole I; 3e, auxiliary holes II; 4. a torsion bar; 5. a gear shaft; 5a, flat square grooves; 5b, connecting holes; 6. a steel ball; 7. an oil control valve cavity; 7a, a right oil inlet valve port; 7b, a left oil inlet valve port; 7c, a right oil return valve port; 7d, a left oil return valve port; 8. passing through the oil cavity; 8a, openings; 9. a flow regulating valve; 10. an auxiliary chamber; 11. an upper bearing; 12. an oil seal; 13. a lower bearing; 14. a fixing pin; 15. a steering power cylinder; 16. rotating the booster pump; 17. an oil storage tank; 18. a steering wheel; 19. a rack; 20. and (3) sealing rings.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1-8, a steering control valve is installed in a steering system, and comprises a valve body 1 with an inner cavity, wherein a valve sleeve 2 is installed in the inner cavity of the valve body 1, a valve core 3 capable of rotating relatively is arranged in the valve sleeve 2, the valve core 3 is provided with an inner hole 3a, and a torsion bar 4 is arranged in the inner hole 3a in a penetrating manner. The upper end of the valve core 3 extends out of the valve body 1, and an upper bearing 11 and an oil seal 12 are arranged between the inner side surface of the upper end of the valve body 1 and the outer side surface of the valve core 3. The lower end of the valve sleeve 2 extends out of the valve body 1, and a lower bearing 13 is arranged between the inner side surface of the lower end of the valve body 1 and the outer side surface of the valve sleeve 2. The steering system comprises a steering gear, the steering gear comprises a rack 19 and a gear shaft 5 meshed with the rack 19, the upper end of the gear shaft 5 is inserted into the lower end of the valve sleeve 2, and an O-shaped ring is arranged between the outer side surface of the upper end of the gear shaft 5 and the inner side surface of the lower end of the valve sleeve 2. Flat square grooves 5a are formed in the upper end face of the gear shaft 5, connecting holes 5b are formed in the bottom face of the flat square grooves 5a, and the lower ends of the torsion bars 4 are inserted into the connecting holes 5 b. The lower end of the torsion bar 4 is penetrated with a fixed pin 14, and two ends of the fixed pin 14 also penetrate into the gear shaft 5 and the valve sleeve 2, so that the torsion bar 4, the gear shaft 5 and the valve sleeve 2 are fixedly connected. The lower extreme of case 3 is provided with the spacing portion 3b of inserting in flat square groove 5a, all is provided with left steering limit face 3b1 and right steering limit face 3b2 on the both sides that are opposite with the lateral wall face of flat square groove 5a on spacing portion 3b, has left turning clearance 3b3 between the lateral wall face that left steering limit face 3b1 and flat square groove 5a correspond, has right turning clearance 3b4 between the lateral wall face that right steering limit face 3b2 and flat square groove 5a correspond. When the valve core 3 rotates clockwise in the overlook direction, the right steering limiting surface 3b2 on the limiting part 3b can be abutted against the side wall surface corresponding to the flat square groove 5 a; when the valve core 3 rotates anticlockwise, the left steering limiting surface 3b1 on the limiting part 3b can be abutted against the side wall surface corresponding to the flat square groove 5 a. When the left steering limit surface 3b1 or the right steering limit surface 3b2 is abutted against the side wall surface corresponding to the flat square groove 5a, and the valve core 3 continues to rotate in the same direction, the limit part 3b pushes the gear shaft 5 to rotate in the same direction, so that the valve sleeve 2 and the torsion bar 4 are driven to rotate together; after the valve core 3 reversely rotates, the left steering limiting surface 3b1 or the right steering limiting surface 3b2 is separated from the side wall surface of the flat square groove 5a, so that the left steering movable gap 3b3 or the right steering movable gap 3b4 is left. The left turning movable gap 3b3 and the right turning movable gap 3b4 enable the valve core 3 and the valve sleeve 2 to rotate relatively, and the left turning limiting surface 3b1 and the right turning limiting surface 3b2 enable the valve core 3 to be connected with the gear shaft 5 and enable the gear shaft 5 to be driven to rotate.

The valve sleeve 2 comprises an oil control part 2a and an adjusting part 2b positioned above the oil control part 2a, a sealing ring I is fixed between the oil control part 2a and the adjusting part 2b on the valve sleeve 2, and the sealing ring I is abutted against the inner side surface of the valve body 1 to form a seal. An oil control valve cavity 7 is arranged between the inner side surface of the oil control part 2a of the valve sleeve 2 and the outer side surface of the valve core 3, and an oil inlet hole 1a, an oil return hole 1b, a left oil passing hole 1c and a right oil passing hole 1d which are all communicated with the oil control valve cavity 7 are arranged on the valve body 1. The left oil passing groove 2a1, the oil inlet groove 2a2, the right oil passing groove 2a3 and the oil return groove 2a4 are sequentially arranged on the outer side surface of the oil control part 2a from top to bottom, the left oil passing groove 2a1, the oil inlet groove 2a2, the right oil passing groove 2a3 and the oil return groove 2a4 are respectively separated by a sealing ring II, a sealing ring III and a sealing ring IV, and the sealing ring II, the sealing ring III and the sealing ring IV are all attached to the inner side surface of the valve body 1 and form sealing. The oil inlet hole 1a, the oil return hole 1b, the left oil passing hole 1c and the right oil passing hole 1d are respectively communicated with the oil inlet groove 2a2, the oil return groove 2a4, the left oil passing groove 2a1 and the right oil passing groove 2a 3. The side wall of the oil control part 2a is provided with a left oil passing through hole 2a5, an oil inlet through hole 2a6, a right oil passing through hole 2a7 and an oil return through hole 2a8, the left oil passing through hole 2a5 is communicated with the left oil passing groove 2a1 and the oil control valve cavity 7, the oil inlet through hole 2a6 is communicated with the oil inlet groove 2a2 and the oil control valve cavity 7, the right oil passing through hole 2a7 is communicated with the right oil passing groove 2a3 and the oil control valve cavity 7, and the oil return through hole 2a8 is communicated with the oil return groove 2a4 and the oil control valve cavity 7. The left oil passing through holes 2a5 are three and are uniformly arranged in sequence along the circumferential direction, the oil inlet through holes 2a6 are three and are uniformly arranged in sequence along the circumferential direction, the right oil passing through holes 2a7 are three and are uniformly arranged in sequence along the circumferential direction, and the oil return through holes 2a8 are three and are uniformly arranged in sequence along the circumferential direction. For convenience of description, the left oil passing through hole 2a5, the oil inlet through hole 2a6, the right oil passing through hole 2a7 and the oil return through hole 2a8 are respectively numbered in sequence in a clockwise direction in a plan view. Six outer oil control grooves which are uniformly distributed along the circumferential direction are formed in the inner side face of the oil control part 2a, six outer oil control blocks are formed among the six outer oil control grooves in the inner side face of the oil control part 2a, inner oil control grooves which are arranged in one-to-one correspondence with the six outer oil control blocks are formed in the outer side face of the valve core 3, and six inner oil control blocks are formed among the six inner oil control grooves in the outer side face of the valve core 3. The oil control valve chamber 7 includes an outer oil control groove and an inner oil control groove. For convenience of description, in the overlooking direction, the outer oil control grooves are numbered in sequence along the clockwise direction, and the outer oil control blocks, the inner oil control grooves and the inner oil control blocks are numbered correspondingly, and a first outer oil control block is arranged between the first outer oil control groove and the second outer oil control groove. The inner end of the first left oil passing through hole 2a5 penetrates through the bottom surface of the first outer oil control groove, the inner end of the first oil inlet through hole 2a6 penetrates through the inner side surface of the first outer oil control block, the inner end of the first right oil passing through hole 2a7 penetrates through the bottom surface of the second outer oil control groove, the inner end of the first oil return through hole 2a8 penetrates through the inner side surface of the second outer oil control block, and other left oil passing through holes 2a5, oil inlet through holes 2a6, right oil passing through holes 2a7 and oil return through holes 2a8 are sequentially arranged. The two sides of the outer oil control block provided with the oil inlet through hole 2a6 are respectively provided with a right oil inlet valve port 7a and a left oil inlet valve port 7b, the two sides of the outer oil control block provided with the oil return through hole 2a8 are respectively provided with a right oil return valve port 7c and a left oil return valve port 7d, the right oil inlet valve port 7a and the right oil return valve port 7c are close to the right oil passing through hole 2a7, and the left oil inlet valve port 7b and the left oil return valve port 7d are close to the left oil passing through hole 2a5.

An annular adjusting cavity 2b1 is arranged between the outer side surface of the adjusting part 2b and the inner side surface of the valve body 1, the inner cavity of the valve body 1 comprises a backflow cavity 1e positioned above the adjusting part 2b, and the adjusting cavity 2b1 is separated from the backflow cavity 1e by a sealing ring five fixed on the adjusting part 2 b. An oil passing cavity 8 is arranged between the inner side surface of the adjusting part 2b and the outer side surface of the valve core 3, the oil passing cavity 8 is positioned above the oil control valve cavity 7, and the oil passing cavity 8 is separated from the oil control valve cavity 7 through a sealing ring 20. The sealing ring 20 is fixed on the valve core 3, and the outer side surface of the sealing ring 20 is abutted against the inner side surface of the valve sleeve 2 to form a seal. The oil passing chamber 8 has an opening 8a at the upper end thereof, and the return chamber 1e communicates with the oil passing chamber 8 through the opening 8 a. The side wall of the valve body 1 is provided with a bypass channel 1f which is communicated with the oil inlet hole 1a and the adjusting cavity 2b1, and the side wall of the valve body 1 is also provided with a return channel 1g which is communicated with the return cavity 1e and the oil return hole 1b. The bypass channel 1f is internally connected with a flow regulating valve 9, the flow regulating valve 9 is an electromagnetic valve or an electric valve, the flow regulating valve 9 is electrically connected with a power steering control unit, and the opening degree of the flow regulating valve 9 is controlled by the power steering control unit, so that the flow of hydraulic oil in the bypass channel 1f is regulated. The adjusting part 2b is uniformly provided with a plurality of through holes 2b2 along the circumferential direction, a rotatable steel ball 6 is arranged in the through holes 2b2, the steel ball 6 can also move in the through holes 2b2, and the inner side part of the steel ball 6 can be abutted against the outer side surface of the valve core 3. The number of the through holes 2b2 is generally six, and may be increased or decreased as needed. The adjusting portion 2b is further provided with an additional hole 2d communicating the adjusting chamber 2b1 and the oil passing chamber 8, and the additional hole 2d is located at a position below the adjusting portion 2 b. The outer surface of the adjusting portion 2b is provided with a fixing groove 2b3 intersecting the through hole 2b2 and having a ring shape, and the fixing groove 2b3 is provided at an upper position. A clamping ring 2b4 is fixed in the fixing groove 2b3, and a movable gap 2b5 is arranged between the clamping ring 2b4 and the steel ball 6. The outer side surface of the valve core 3 is provided with caulking grooves 3c which are in one-to-one correspondence with the through holes 2b2, contact surfaces 3c1 which are obliquely arranged are arranged on the side wall surfaces of the two sides of the caulking grooves 3c, and the inner side part of the steel ball 6 can be embedded into the caulking grooves 3c and is abutted against at least one contact surface 3c 1. The side wall of the valve core 3 is provided with an auxiliary hole I3 d communicated with the oil control valve cavity 7 and the inner hole 3a and an auxiliary hole II 3e communicated with the oil cavity 8 and the inner hole 3a, and the lower end of the inner hole 3a of the valve core 3 is communicated with the oil return hole 1b. An annular gap is formed between the inner side surface of the valve core 3 and the outer side surface of the torsion bar 4, an auxiliary cavity 10 is formed between the inner side surface of the lower end of the valve sleeve 2 and the outer side surface of the lower end of the valve core 3, the auxiliary cavity 10 is communicated with the lower end of the inner hole 3a, and an auxiliary hole III 2c for communicating the auxiliary cavity 10 with the oil return groove 2a4 is formed in the side wall of the lower end of the valve sleeve 2.

The steering system further comprises a power steering control unit, a steering cylinder 15, a rotary booster pump 16, an oil reservoir 17 and a steering wheel 18. The piston rod of the steering cylinder 15 is connected to the rack 19 of the steering gear. The ECM on the automobile and the combination meter and the A/C ampere meter are electrically connected with the power steering control unit, the ECM sends an engine rotating speed signal to the power steering control unit, the combination meter and the A/C ampere meter send a vehicle speed signal to the power steering control unit, and the power steering control unit controls the current of the flow regulating valve 9 after receiving the engine rotating speed signal and the vehicle speed signal, so that the opening degree of the flow regulating valve 9 is controlled. When the steering control valve is installed in the steering system, the upper end of the valve core 3 is connected with the steering wheel 18, the lower end of the valve core 3 is connected with the flat square groove 5a through the limiting part 3b, the oil inlet hole 1a of the steering control valve is communicated with the steering booster pump, the oil return hole 1b of the steering control valve is communicated with the oil storage tank 17, the left oil passing hole 1c is communicated with the left cavity of the steering power cylinder 15, and the right oil passing hole 1d is communicated with the right cavity of the steering power cylinder 15.

After the automobile is started, as the steering booster pump is connected with the engine, the engine rotates to drive the steering booster pump to rotate, so that hydraulic oil in the oil storage tank 17 is pumped into the steering control valve through the oil inlet hole 1 a. When not turning, the hydraulic oil sequentially enters the oil control valve cavity 7 through the oil inlet hole 1a, the oil inlet groove 2a2 and the oil inlet through hole 2a6, and then sequentially returns to the oil storage tank 17 through the oil return through hole 2a8, the oil return groove 2a4 and the oil return hole 1 b. When the steering wheel 18 rotates to steer, the steering wheel 18 drives the valve core 3 to rotate, the valve core 3 and the valve sleeve 2 rotate relatively, and hydraulic oil enters the steering power cylinder 15 through the left oil passing hole 1c or the right oil passing hole 1 d. For example, when the valve core 3 rotates clockwise in the top view direction, the right oil inlet port 7a and the left oil return port 7d become larger, the left oil inlet port 7b and the right return port become smaller and even close, hydraulic oil flows out from the right oil control valve cavity 7 through the right oil inlet port 7a, the right oil passing through hole 2a7 and the right oil passing through hole 2a3 and enters the right chamber of the steering cylinder 15, so as to push the piston of the steering cylinder 15 to move leftwards, hydraulic oil in the left chamber of the steering cylinder 15 enters the oil control valve cavity 7 from the left oil return port 7d through the left oil passing through hole 1c, the left oil passing through hole 2a1 and the left oil passing through hole 2a5, and redundant hydraulic oil in the oil control valve cavity 7 returns to the oil storage tank 17 through the oil return hole 1 b. In the top view direction, when the valve core 3 rotates anticlockwise, the left oil inlet valve port 7b and the right oil return valve port 7c are enlarged, the right oil inlet valve port 7a and the left return valve port are reduced or even closed, hydraulic oil flows out from the left oil inlet valve port 7b, the left oil passing through hole 2a5 and the left oil passing through hole 2a1 in the oil control valve cavity 7 and enters the left cavity of the steering power cylinder 15, so that the piston of the steering power cylinder 15 is pushed to move rightwards, hydraulic oil in the right cavity of the steering power cylinder 15 enters the oil control valve cavity 7 from the right oil return valve port 7c through the right oil passing through hole 1d, the right oil passing through hole 2a3 and the right oil passing through hole 2a7, and redundant hydraulic oil in the oil control valve cavity 7 returns to the oil storage tank 17 through the oil return hole 1 b. The movement of the piston rod in the steering power cylinder 15 drives the rack 19 to move, and meanwhile, the gear shaft 5 of the steering gear drives the rack 19 to move, so that the steering of wheels is realized. The driving force on the gear shaft 5 is a main driving force, and the driving force in the steering cylinder 15 is an auxiliary driving force.

When the automobile is in low-speed running steering or idle-speed parking steering, the power steering control unit controls the flow regulating valve 9 in the bypass channel 1f to be in a small flow opening or closed state, the steel ball 6 is subjected to little or no oil pressure, the steel ball 6 cannot hold the valve core 3 tightly, the valve core 3 rotates until the left steering limiting surface 3b1 or the right steering limiting surface 3b2 of the limiting part 3b is abutted against the side wall surface corresponding to the flat square groove 5a, the relative rotation angle between the valve core 3 and the valve sleeve 2 is maximum after the valve core 3 rotates, the opening of the left oil inlet valve port 7b or the right oil inlet valve port 7a is maximum, oil pressure generated by the steering booster pump basically acts on the steering booster cylinder, and thus auxiliary driving force generated by the steering booster cylinder reduces the main driving force which is required by the steering gear shaft 5 to drive the rack 19 to move, namely the torsional force required by the steering wheel 18 is reduced, and the steering wheel 18 rotates lightly and parks at low-speed running or idle speed.

When the automobile is driven and steered at a high speed, the power steering control unit controls the opening of the flow regulating valve 9 in the bypass passage 1f to be increased, part of hydraulic oil pumped into the steering control valve by the steering booster pump enters the oil control valve cavity 7 and acts on the steering power cylinder 15, the other part enters the regulating cavity 2b1 through the bypass passage 1f and acts on the steel ball 6, and then returns to the oil storage tank 17 from the oil return hole 1b after passing through the through hole 2b2, the oil passing cavity 8, the oil return cavity and the oil return passage. On the one hand, due to the opening of the bypass passage 1f, only part of the hydraulic oil pumped by the steering assist pump enters the oil control valve chamber 7 to act on the steering cylinder 15, so that the auxiliary driving force on the steering cylinder 15 is reduced compared to that without the bypass passage 1f, and the torque force required for turning the steering wheel 18 is increased compared to that without the bypass passage 1 f. On the other hand, the other part of the hydraulic oil pumped by the steering assist pump is introduced into the adjustment chamber 2b1 and acts on the steel ball 6, the hydraulic oil holds the valve core 3 tightly by the steel ball 6 uniformly arranged in the circumferential direction of the valve housing 2, the rotational resistance of the valve core 3 is increased, the valve core 3 is made difficult to rotate relative to the valve housing 2, namely, the right oil inlet valve port 7a and the left oil inlet valve port 7b in the oil control valve chamber 7 are made difficult to open, so that the flow rate of the hydraulic oil entering the power steering pump from the right oil passing hole 1d or the left oil passing hole 1c is further reduced, the oil pressure entering the steering power pump is further reduced, and the torsion force required by the rotation of the steering wheel 18 is further increased. Therefore, in the high-speed running process of the automobile, the bypass passage 1f is added at the oil inlet hole 1a to reduce the oil inlet flow and the oil pressure so as to reduce the auxiliary driving force on the steering power cylinder 15, and the steel ball 6 is used for holding the valve core 3 tightly so as to reduce the flow and the oil pressure flowing out of the left oil passing hole 1c or the right oil passing hole 1d so as to further reduce the auxiliary driving force on the steering power cylinder 15, thereby greatly increasing the torsion force required by the steering wheel 18 and more effectively preventing the problem of floating when the automobile runs and turns at high speed.

In addition, during high-speed driving steering, the inner side part of the steel ball 6 is embedded into the caulking groove 3c under the action of oil pressure, when the oil pressure is large enough, the steel ball 6 is abutted against the two contact surfaces 3c1, so that the valve core 3 and the valve sleeve 2 are locked and cannot rotate relatively, hydraulic oil in the oil control valve cavity 7 cannot enter the steering power cylinder 15 at the moment, the auxiliary driving force is basically zero, and the main driving force required by the rotation of the steering wheel is maximum. When the oil pressure can not enable the steel ball 6 to simultaneously abut against the two contact surfaces 3c1, the valve core 3 and the valve sleeve 2 can relatively rotate, hydraulic oil in the oil control valve cavity 7 can enter the steering power cylinder 15, the magnitude of the auxiliary driving force is related to the magnitude of the oil pressure received by the steel ball 6, and therefore the magnitude of the auxiliary driving force can be adjusted by adjusting the opening degree of the flow rate adjusting valve 9, and the torsion force required by rotation of the steering wheel 18 is changed.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The steering control valve comprises a valve body (1), wherein a valve sleeve (2) is arranged in an inner cavity of the valve body (1), a valve core (3) capable of rotating relatively is arranged in the valve sleeve (2), an oil control valve cavity (7) is arranged between the outer side surface of the valve core (3) and the inner side surface of the valve sleeve (2), oil inlet holes (1 a), oil return holes (1 b), left oil passing holes (1 c) and right oil passing holes (1 d) which are communicated with the oil control valve cavity (7) are arranged on the valve body (1), the steering control valve is characterized in that the valve sleeve (2) comprises an adjusting part (2 b), an annular adjusting cavity (2 b 1) is arranged between the outer side surface of the adjusting part (2 b) and the inner side surface of the valve body (1), a bypass channel (1 f) communicated with the oil inlet holes (1 a) and the adjusting cavity (2 b 1) is arranged on the valve body (1), a plurality of through holes (2 b) are uniformly arranged on the adjusting part (2 b) along the circumferential direction, the inner side surfaces of the adjusting part (2 b) are abutted against the inner side surfaces of the steel balls (6) of the valve core (2 b) and the inner side surfaces (6) can be abutted against the steel balls (6), the oil return valve is characterized in that caulking grooves (3 c) corresponding to the through holes (2 b 2) one by one are formed in the outer side face of the valve core (3), contact faces (3 c 1) which are obliquely arranged are formed in the side wall faces of the two sides of the caulking grooves (3 c), the inner side portion of the steel ball (6) can be embedded into the caulking grooves (3 c) and is abutted to at least one contact face (3 c 1), an oil passing cavity (8) is formed between the inner side face of the adjusting portion (2 b) and the outer side face of the valve core (3), the oil passing cavity (8) is located above the oil control valve cavity (7), the oil passing cavity (8) is separated from the oil control valve cavity (7) through a sealing ring (20), an opening (8 a) is formed in the upper end of the oil passing cavity (8), the oil passing cavity (8) is communicated with the oil return hole (1 b) through the opening (8 a), a backflow cavity (1 e) is formed in the valve body (1) and is formed in the side wall of the valve body (1), and the oil return cavity (1 b) is communicated with the oil return cavity (1 d) through the adjusting cavity (1 b).

2. The steering control valve according to claim 1, characterized in that a ring-shaped fixing groove (2 b 3) intersecting with the through hole (2 b 2) is provided on the outer side surface of the adjusting portion (2 b), a snap ring (2 b 4) is fixed in the fixing groove (2 b 3), and a movable gap (2 b 5) is provided between the snap ring (2 b 4) and the steel ball (6).

3. The steering control valve according to claim 1 or 2, characterized in that an inner hole (3 a) is provided in the valve core (3), the lower end of the inner hole (3 a) is communicated with the oil return hole (1 b), and an auxiliary hole one (3 d) for communicating the oil control valve cavity (7) with the inner hole (3 a) and an auxiliary hole two (3 e) for communicating the oil cavity (8) with the inner hole (3 a) are provided on the side wall of the valve core (3).