CN110901755A

CN110901755A - Steering control valve

Info

Publication number: CN110901755A
Application number: CN201911367114.9A
Authority: CN
Inventors: 李孙建; 谢丽华; 胡稔松
Original assignee: TAIZHOU YONGAN REDIRECTOR CO Ltd
Current assignee: TAIZHOU YONGAN REDIRECTOR CO Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-03-24
Anticipated expiration: 2039-12-26
Also published as: CN110901755B

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 floating feeling when the automobile runs at high speed and the like. This steering control valve, which comprises a valve body, install the valve barrel in the valve body, be provided with the case of relative pivoted in the valve barrel, the accuse oil valve pocket has between the lateral surface of case and the medial surface of valve barrel, be provided with the inlet port on the valve body, the oil gallery, oil hole and right oil hole are crossed to the left side, the valve barrel includes the regulating part, the regulation chamber has between the lateral surface of regulating part and the medial surface of valve body, be provided with the bypass channel of intercommunication inlet port and regulation chamber on the valve body, bypass channel in-connection has flow control valve, evenly be provided with the several through-hole along circumference in the regulating part, the inner and the oil gallery intercommunication of through-hole, install mobilizable steel ball in the through-hole, the. The steering control valve can effectively prevent the problem of drifting when the automobile runs at high speed and steers.

Description

Steering control valve

Technical Field

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

Background

The steering system refers to a device for changing or maintaining the driving or reverse direction of a vehicle, and functions to control the driving direction of the vehicle according to the intention of a driver. The steering system comprises a mechanical steering system and a power steering system, the mechanical steering system takes the physical power of a driver as a steering energy source, the power steering system is used for taking the physical power of the driver and the engine power as the steering energy source, and the power steering system is generally adopted on an automobile at present.

The hydraulic power steering system is a common power steering system and comprises a steering gear, a steering power cylinder, a steering control valve, an oil storage tank, a steering power pump and the like. The steering gear is a gear shaft rack type steering gear and comprises a gear shaft and a rack which are meshed with each other, a steering control valve comprises a valve body, a valve sleeve and a valve core, the valve sleeve and the valve core can rotate relative to each other, 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 a gear shaft, a piston rod of a steering power cylinder is connected with the rack, and the steering power cylinder, the steering control valve, a steering power-assisted pump and. The engine is used as a power source, the engine drives the power steering pump to work, the power steering pump pumps hydraulic oil in the 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 rotate relatively, and the opening degree of a valve port of the oil control valve cavity changes, so that the 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, and the movement of the piston of the steering power cylinder and the movement of the rack drive the tire to steer. During the steering process of the vehicle, the steering action is still finished by a driver, the hydraulic pressure of the power steering system only plays an auxiliary role in steering, the driving force on the gear shaft is the main driving force, and the driving force in the steering power cylinder is the auxiliary driving force. When the automobile is driven to steer at low speed or is parked to steer at idle speed, the steering power cylinder is required to provide large auxiliary driving force to enable the steering wheel to rotate lightly due to large friction force between wheels and the ground; when the automobile is driven at high speed to steer, the steering power cylinder is needed to reduce the auxiliary driving force, so that the steering wheel is prevented from rotating lightly, and the problem of 'floating' caused by the loss of road feel of the automobile is avoided.

Chinese patent literature discloses a dual-purpose rotary valve of an automobile power steering gear, which is disclosed in the application number: CN 00210849.6; the notice number is: CN 2406896Y ], which is composed of a torsion bar, a valve core, a valve sleeve, a valve body and an electromagnetic valve, wherein, the valve groove on the outer surface of the valve core and the inner surface of the valve sleeve forms a high-speed valve port and a low-speed valve port, a bypass hole is arranged between the high-speed valve port and the low-speed valve port, the bypass holes on the left and right sides are connected together by a bypass loop, the electromagnetic valve is arranged on the bypass loop, and the on-off of the bypass loop is controlled by the switch. When the steering wheel is used, when the electromagnetic valve is closed, hydraulic oil can only flow back through the steering power cylinder, the pressure of the hydraulic oil is completely acted on the steering power cylinder, the steering auxiliary driving force is large, and therefore the torque required by the rotation of the steering wheel is reduced; when the electromagnetic valve is opened, hydraulic oil can also flow back through the bypass circuit, 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 the rotation of the steering wheel is increased. However, when the oil pressure is increased by the same amount, the torque increase amount required for turning the steering wheel when the electromagnetic valve is closed and opened is basically unchanged, that is, during the process of driving the automobile at a high speed, although the torque required for turning the steering wheel is increased, the increase amount is still insufficient, and the drifting feeling is still caused.

Disclosure of Invention

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

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a steering control valve, includes the valve body, install the valve barrel in the inner chamber of valve body, be provided with relative pivoted case in the valve barrel, the accuse oil valve pocket has between the lateral surface of case and the medial surface of valve barrel, be provided with all with the inlet port, oil gallery, left oilhole and the right oilhole of crossing of accuse oil valve pocket intercommunication on the valve body, its characterized in that, the valve barrel includes the regulating part, it is annular regulation chamber to have between the lateral surface of regulating part and the medial surface of valve body, be provided with the bypass passageway of intercommunication inlet port and regulation chamber on the valve body, bypass passageway in-connection has flow control valve, evenly be provided with the several through-hole along circumference in the regulating part, the inner and the oil gallery intercommunication of through-hole, install mobilizable steel ball in the through-hole, the medial part of steel ball can support and lean on the lateral.

The steering control valve is installed in a steering system, the upper end of the valve core is connected with a steering wheel, the lower end of the valve core is connected with a gear shaft of a steering gear, an oil inlet hole of the steering control valve is communicated with a steering power-assisted pump, an oil return hole of the steering control valve is communicated with an oil storage tank, a left oil passing hole is communicated with a left cavity of a steering power cylinder, and a right oil passing hole is communicated with a right cavity of the steering power cylinder. After the automobile is started, the power steering pump is connected with the engine, and the engine rotates to drive the power steering 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 the steering is not performed, 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 size of a valve port 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 to enable a piston rod of the steering power cylinder to move, the piston rod can assist in driving the rack to move when moving, and meanwhile, a gear shaft of the steering gear drives the rack to move, so that the steering of wheels is realized. The driving force on the gear shaft is the main driving force and the driving force in the steering power cylinder is the auxiliary driving force.

When the automobile is in low-speed running steering or idling stop steering, the flow regulating valve in the bypass passage is in a small flow opening degree or in a closed state, and the oil pressure generated by the power steering pump basically acts on the power steering cylinder, so that the auxiliary driving force generated on the power steering cylinder reduces the force required by the gear shaft of the steering gear to drive the rack to move, namely the torsion force required by the steering wheel to rotate, and the steering wheel is convenient to rotate during low-speed running steering or idling stop steering of the automobile.

When the automobile is driven to steer at a high speed, the opening degree of the flow regulating valve in the bypass channel is increased, one part of hydraulic oil pumped into the steering control valve by the power steering pump enters the oil control valve cavity and acts on the steering power cylinder, and the other part of the hydraulic oil 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 one hand, as only part of hydraulic oil pumped by the power steering pump enters the oil control valve cavity and acts on the steering power cylinder, the auxiliary driving force on the steering power cylinder is reduced compared with that when the bypass channel is not opened, and the torsional force required by the rotation of the steering wheel is increased compared with that when the bypass channel is not opened. On the other hand, the other part of the hydraulic oil pumped by the power steering pump is introduced into the adjusting cavity and acts on the steel ball, the steel ball uniformly arranged on the circumferential direction of the valve sleeve holds the valve core tightly by the hydraulic oil, 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, the oil pressure entering the power steering pump is further reduced, and the torsion force required by the rotation of the steering wheel is further increased. Therefore, in the process of high-speed running of the automobile, the bypass channel is additionally arranged at the oil inlet hole to reduce the oil inlet flow so as to reduce the auxiliary driving force on the steering power cylinder, and meanwhile, the steel ball clasps the valve core to reduce the flow flowing out of the left oil passing hole or the right oil passing hole so as to further reduce the auxiliary driving force on the steering power cylinder, so that the torsion force required by the steering wheel is greatly increased, and the problem of drifting during high-speed running and steering of the automobile is effectively solved.

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 at two sides of the caulking grooves are respectively provided with the contact surface which is obliquely arranged, and the inner side part of the steel ball can be embedded into the caulking groove and is abutted against at least one contact surface.

When flow control valve aperture is little or close, the outside portion of steel ball receives very little pressure or does not receive the effect of oil pressure, because the steel ball is spherical and can be in the through-hole internalization, the steel ball is rotatable and can move in the through-hole promptly, and the contact surface slope of caulking groove sets up, the steel ball just can freely pass in and out the caulking groove like this, the rotation resistance of case can not be increased in the caulking groove to the inside portion embedding of steel ball, consequently, the setting of caulking groove can not increase the required torsional force of steering wheel when the car is gone at low speed or idle parking turns to, make to turn to and be in light state. When the flow regulating valve opens the grow, the outside portion of steel ball receives the effect of very big oil pressure, the steel ball atress is close to and supports with the contact surface to the case, because the contact surface slope sets up, the case rotates and still need outwards push away the steel ball except that need overcome steel ball pivoted frictional resistance, compare in that the steel ball directly supports and leans on the face of cylinder, the case rotates and need overcome bigger resistance, it becomes more difficult to make the case rotate for the valve barrel and open the valve port in the accuse oil valve chamber, make the flow that flows from left oil passing hole or right oil passing hole further reduce, the oil pressure that enters into in the steering power pump like this will further reduce, thereby can further increase the required torsional force of steering wheel rotation, the more effectual problem that flies when preventing the car high speed and turning to.

In the steering control valve, an annular fixing groove intersected with the through hole is formed in the outer side surface of the adjusting portion, 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 from the through hole, a movable gap is formed between the clamping ring and the steel ball, the movement of the steel ball in the caulking groove can be guaranteed, the auxiliary driving force of the power steering cylinder is prevented from being invalid or unadjustable due to the fact that the valve core and the valve sleeve cannot rotate relatively because the steel ball is clamped in the caulking groove, and therefore the use stability of the steering control valve is guaranteed, and the portability of low-speed driving steering and idling parking steering is guaranteed.

In the steering control valve, an oil passing cavity is arranged between the inner side surface of the adjusting part and the outer side surface of the valve core, the oil passing cavity is positioned 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 and the oil control valve cavity are separated by 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 steering control valve is stable in use state, 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 is returned through the opening at the upper end of the oil passing cavity, so that pressure of hydraulic oil flowing from the bypass channel on the steel ball can be generated, 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 passage for communicating the backflow cavity with the oil return hole is arranged on the side wall of the valve body. The arrangement ensures that the hydraulic oil flows back above the adjusting part, ensures that the hydraulic oil flowing out of the bypass channel can generate pressure on the steel ball, and ensures the working effectiveness of the steering control valve.

In the steering control valve, the adjusting portion is further provided with an additional hole communicating the adjusting chamber and the oil passing chamber.

Can make the hydraulic oil in the regulation chamber enter into the oil cavity through the additional hole, avoid the through-hole to be plugged up by the steel ball and can not lead to when the oil can not be crossed the backward flow, guarantee that hydraulic oil can follow the backward flow of oil cavity, just can realize shunting the hydraulic oil of oil inlet department, thereby can reduce the hydraulic oil that enters into the accuse oil valve chamber from the oil inlet, reduce the auxiliary drive power among the power cylinder that turns to, can make the required torsional force of steering wheel rotation increase, the effectual problem that flies when preventing that the car from going to turn to at a high speed.

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 a first auxiliary hole for communicating the oil control valve cavity with the inner hole and a second auxiliary hole for communicating the oil cavity with the inner hole are formed in the side wall of the valve core.

Redundant hydraulic oil in the oil control valve cavity flows back as soon as possible through the auxiliary hole I and the inner hole, redundant hydraulic oil in the oil passing cavity flows back as soon as possible through the auxiliary hole II and the inner hole, and therefore the hydraulic pressure in the steering control valve is guaranteed to be within 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 bypass channel is arranged on the valve body and communicated with the oil inlet hole and the adjusting cavity, the flow adjusting valve is installed in the bypass channel, the valve sleeve is provided with the steel ball, and the valve core can be tightly held by the steel ball under the action of oil pressure, so that the auxiliary driving force of the steering power cylinder can be greatly reduced, and the problem of fluttering of an automobile during high-speed driving and steering is more 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 drifting when the automobile runs at high speed and turns 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 tightly holds the valve core, so that the steering control valve works stably.

Drawings

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

FIG. 2 is an exploded 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 steering control valve at the center control oil 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 connection of the spool and the pinion shaft of 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 view of the operation of the steering control valve.

In the figure, 1, a valve body; 1a, an oil inlet hole; 1b, an oil return hole; 1c, a left oil passing hole; 1d, a right oil passing hole; 1e, a reflux cavity; 1f, a bypass channel; 1g, a backflow channel; 2. a valve housing; 2a, an oil control part; 2a1, left oil sump; 2a2, oil inlet tank; 2a3, right oil passing groove; 2a4, oil return groove; 2a5, left oil through hole; 2a6, oil inlet through holes; 2a7, right oil through hole; 2a8, oil return through hole; 2b, an adjusting part; 2b1, adjustment chamber; 2b2, vias; 2b3, fixing groove; 2b4, snap ring; 2b5, active clearance; 2c, an auxiliary hole III; 2d, additional holes; 3. a valve core; 3a, an inner hole; 3b, a limiting part; 3b1, left steering limit surface; 3b2, right steering limit surface; 3b3, left turn play; 3b4, right turn play; 3c, caulking grooves; 3c1, contact surface; 3d, auxiliary holes I; 3e, a second auxiliary hole; 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. an oil passing cavity; 8a, an opening; 9. a flow regulating valve; 10. an auxiliary chamber; 11. an upper bearing; 12. oil sealing; 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 (5) sealing rings.

Detailed Description

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

Example one

As shown in fig. 1 to 8, a steering control valve, which is installed in a steering system, includes a valve body 1 having an inner cavity, a valve sleeve 2 is installed in the inner cavity of the valve body 1, a valve core 3 which can rotate relatively is installed in the valve sleeve 2, the valve core 3 is provided with an inner hole 3a, and a torsion bar 4 is inserted into the inner hole 3 a. 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 face of the upper end of the valve body 1 and the outer side face 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 face of the upper end of the gear shaft 5 and the inner side face of the lower end of the valve sleeve 2. The upper end surface of the gear shaft 5 is provided with a flat square groove 5a, the bottom surface of the flat square groove 5a is provided with a connecting hole 5b, and the lower end of the torsion bar 4 is inserted into the connecting hole 5 b. The lower end of the torsion bar 4 is provided with a fixing pin 14 in a penetrating way, and two ends of the fixing pin 14 are also inserted into the gear shaft 5 and the valve housing 2, so that the torsion bar 4, the gear shaft 5 and the valve housing 2 are fixedly connected. The lower end of the valve core 3 is provided with a limiting part 3b inserted into the flat square groove 5a, two sides of the limiting part 3b opposite to the side wall surface of the flat square groove 5a are provided with a left steering limiting surface 3b1 and a right steering limiting surface 3b2, a left turning movable gap 3b3 is arranged between the left steering limiting surface 3b1 and the side wall surface corresponding to the flat square groove 5a, and a right turning movable gap 3b4 is arranged between the right steering limiting surface 3b2 and the side wall surface corresponding to the flat square groove 5 a. When the valve core 3 rotates clockwise in the overlooking direction, the right steering limit surface 3b2 on the limit part 3b can abut against the corresponding side wall surface of the flat square groove 5 a; when the valve body 3 rotates counterclockwise, the left steering stopper surface 3b1 on the stopper portion 3b can abut against the side wall surface corresponding to the flat square groove 5 a. When the left steering limiting surface 3b1 or the right steering limiting surface 3b2 abuts 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 limiting 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 rotates reversely, the left steering stopper face 3b1 or the right steering stopper face 3b2 leaves the side wall face of the flat groove 5a again to leave the left-turn play gap 3b3 or the right-turn play gap 3b 4. The left-turn movable gap 3b3 and the right-turn movable gap 3b4 are arranged to enable the valve core 3 and the valve sleeve 2 to rotate relatively, and the left-turn limiting surface 3b1 and the right-turn limiting surface 3b2 are arranged to enable the valve core 3 and the gear shaft 5 to be connected and to drive the gear shaft 5 to rotate.

The valve sleeve 2 comprises an oil control part 2a and an adjusting part 2b located above the oil control part 2a, and a first sealing ring is fixed between the oil control part 2a and the adjusting part 2b on the valve sleeve 2 and is attached to the inner side surface of the valve body 1 to form sealing. 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 outer side surface of the oil control part 2a is sequentially provided with a left oil passing groove 2a1, an oil inlet groove 2a2, a right oil passing groove 2a3 and an oil return groove 2a4 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 separated by a second sealing ring, a third sealing ring and a fourth sealing ring, and the second sealing ring, the third sealing ring and the fourth sealing ring are 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 sequentially and uniformly arranged along the circumferential direction, the right oil passing through holes 2a6 are three and are sequentially and uniformly arranged along the circumferential direction, the right oil passing through holes 2a7 are three and are sequentially and uniformly arranged along the circumferential direction, and the oil return through holes 2a8 are three and are sequentially and uniformly arranged 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 numbered in the clockwise direction in plan view. Six outer side oil control grooves which are uniformly distributed along the circumferential direction are formed in the inner side face of the oil control portion 2a, six outer side oil control blocks are formed among the six outer side oil control grooves in the inner side face of the oil control portion 2a, inner side oil control grooves which are arranged in one-to-one correspondence with the six outer side oil control blocks are formed in the outer side face of the valve element 3, and six inner side oil control blocks are formed among the six inner side oil control grooves in the outer side face of the valve element 3. The oil control valve chamber 7 comprises 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, the outer oil control blocks, the inner oil control grooves and the inner oil control blocks are numbered correspondingly, and the 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. A right oil inlet valve port 7a and a left oil inlet valve port 7b are respectively arranged on two sides of the outer oil control block provided with the oil inlet through hole 2a6, a right oil return valve port 7c and a left oil return valve port 7d are respectively arranged on two sides of the outer oil control block provided with the oil return through hole 2a8, 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 2a 5.

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 through 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 and the oil control valve cavity 7 are separated by a sealing ring 20. A sealing ring 20 is fixed on the valve core 3, and the outer side of the sealing ring 20 abuts against the inner side of the valve housing 2 and forms a seal. The oil-passing chamber 8 has an opening 8a at its upper end, 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 for communicating the oil inlet 1a with the adjusting cavity 2b1, and the side wall of the valve body 1 is also provided with a return channel 1g for communicating the return cavity 1e with the oil return hole 1 b. The flow control valve 9 is connected in the bypass channel 1f, the flow control valve 9 is an electromagnetic valve or an electrically operated valve, the flow control valve 9 is electrically connected with the power steering control unit, and the opening degree of the flow control valve 9 is controlled by the power steering control unit, so that the flow of hydraulic oil in the bypass channel 1f is adjusted. A plurality of through holes 2b2 are uniformly arranged on the adjusting part 2b along the circumferential direction, a rotatable steel ball 6 is arranged in the through hole 2b2, the steel ball 6 can also move in the through hole 2b2, and the inner side part of the steel ball 6 can abut 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 necessary. 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 lower than the adjusting portion 2 b. The outer side surface of the adjusting part 2b is provided with a fixing groove 2b3 which is in a ring shape and intersects with the through hole 2b2, and the fixing groove 2b3 is arranged at an upper position. A snap ring 2b4 is fixed in the fixing groove 2b3, and a movable gap 2b5 is formed between the snap ring 2b4 and the steel ball 6. The outer side surface of the valve core 3 is provided with a caulking groove 3c corresponding to the through hole 2b2 one by one, the side wall surfaces at two sides of the caulking groove 3c are respectively provided with a contact surface 3c1 which is arranged obliquely, and the inner side part of the steel ball 6 can be embedded into the caulking groove 3c and is abutted against at least one contact surface 3c 1. The side wall of the valve core 3 is provided with a first auxiliary hole 3d for communicating the oil control valve cavity 7 with the inner hole 3a and a second auxiliary hole 3e for communicating the oil cavity 8 with 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 1 b. An annular gap is formed between the inner side face of the valve core 3 and the outer side face of the torsion bar 4, an auxiliary cavity 10 is formed between the inner side face of the lower end of the valve sleeve 2 and the outer side face 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.

The steering system also includes a power steering control unit, a steering power cylinder 15, a rotary booster pump 16, an oil reservoir 17 and a steering wheel 18. The piston rod of the steering power cylinder 15 is connected to the rack 19 of the steering gear. The ECM, the combination instrument and the A/C ammeter on the automobile 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 instrument and the A/C ammeter 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 as to control the opening degree of the flow regulating valve 9. When the steering control valve is installed in a steering system, the upper end of the valve core 3 is connected with a steering wheel 18, the lower end of the valve core 3 is connected with a gear shaft 5 of a steering gear through a limiting part 3b and a flat square groove 5a, an oil inlet hole 1a of the steering control valve is communicated with a steering power-assisted pump, an oil return hole 1b of the steering control valve is communicated with an oil storage tank 17, a left oil passing hole 1c is communicated with a left cavity of a steering power cylinder 15, and a right oil passing hole 1d is communicated with a right cavity of the steering power cylinder 15.

After the automobile is started, the power steering pump is connected with the engine, and the engine rotates to drive the power steering 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 the hydraulic oil is not turned, the hydraulic oil sequentially passes through the oil inlet hole 1a, the oil inlet groove 2a2 and the oil inlet through hole 2a6 to enter the oil control valve cavity 7, and then sequentially passes through the oil return through hole 2a8, the oil return groove 2a4 and the oil return hole 1b to return to the oil storage tank 17. 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 a top view, the right oil inlet valve port 7a and the left oil return valve port 7d become larger, the left oil inlet valve port 7b and the right oil return valve port become smaller and even close, hydraulic oil flows out from the right oil passing hole 1d and enters the right side chamber of the steering power cylinder 15 after passing through the right oil inlet valve port 7a, the right oil passing through hole 2a7 and the right oil passing groove 2a3 from the oil control valve chamber 7, so as to push the piston of the steering power cylinder 15 to move leftward, hydraulic oil in the left side chamber of the steering power cylinder 15 enters the oil control valve chamber 7 from the left oil return valve port 7d after passing through the left oil passing hole 1c, the left oil passing groove 2a1 and the left oil passing through hole 2a5, and redundant hydraulic oil in the oil control valve chamber 7 returns to the oil storage tank 17 through the oil return hole 1. When the valve core 3 rotates counterclockwise in a top view direction, the left oil inlet valve port 7b and the right oil return valve port 7c become larger, the right oil inlet valve port 7a and the left return valve port become smaller or even close, hydraulic oil flows out from the left oil passing hole 1c and enters the left chamber of the steering power cylinder 15 after passing through the left oil inlet valve port 7b, the left oil passing hole 2a5 and the left oil passing groove 2a1 from the oil control valve chamber 7, so as to push the piston of the steering power cylinder 15 to move rightward, hydraulic oil in the right chamber of the steering power cylinder 15 enters the oil control valve chamber 7 from the right oil return valve port 7c after passing through the right oil passing hole 1d, the right oil passing groove 2a3 and the right oil passing hole 2a7, and redundant hydraulic oil in the oil control valve chamber 7 returns to the oil storage tank 17 through the oil return hole 1 b. The rack 19 is driven to move by the movement of the piston rod in the steering power cylinder 15, and the rack 19 is driven to move by the gear shaft 5 of the steering gear, so that the steering of the wheels is realized. The driving force on the pinion shaft 5 is the main driving force and the driving force in the steering power cylinder 15 is the auxiliary driving force.

When the automobile is steered in a low-speed driving mode or in an idling stop mode, the power steering control unit controls the flow regulating valve 9 in the bypass channel 1f to be in a small flow opening degree or in a closed state, the steel ball 6 is subjected to little oil pressure action or no oil pressure action, 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 abuts 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 after the valve core 3 rotates is the largest, the opening degree of the left oil inlet valve port 7b or the right oil inlet valve port 7a is the largest, the oil pressure generated by the steering power pump basically acts on the steering power cylinder, so that the auxiliary driving force generated on the steering power cylinder enables the force, namely the main driving force required by the steering gear shaft 5 for driving the rack 19 to move to be reduced, and the torsion force required by the, so that the steering wheel 18 is easily rotated when the vehicle is driven at a low speed or stopped at an idle speed.

When the automobile is steered in a high-speed running mode, the power steering control unit controls the opening degree of the flow regulating valve 9 in the bypass channel 1f to be increased, one part of hydraulic oil pumped into the steering control valve by the power steering pump enters the oil control valve cavity 7 and acts on the steering power cylinder 15, the other part of the hydraulic oil enters the adjusting cavity 2b1 through the bypass channel 1f and acts on the steel ball 6, and then the hydraulic oil returns to the oil storage tank 17 from the oil return hole 1b through the through hole 2b2, the oil passing cavity 8, the oil return cavity and the oil return channel. On the one hand, due to the opening of the bypass passage 1f, only a part of the hydraulic oil pumped by the power steering pump enters the oil control valve chamber 7 and acts on the steering power cylinder 15, so that the auxiliary driving force on the steering power cylinder 15 is reduced compared with the situation that the bypass passage 1f is not opened, and the torsion force required by the rotation of the steering wheel 18 is increased compared with the situation that the bypass passage 1f is not opened. On the other hand, the other part of the hydraulic oil pumped by the power steering pump is introduced into the adjusting cavity 2b1 and acts on the steel ball 6, the steel ball 6 uniformly arranged on the circumference of the valve sleeve 2 is tightly held by the hydraulic oil to increase the rotation resistance of the valve core 3, so that the valve core 3 is difficult to rotate relative to the valve sleeve 2, namely, the right oil inlet valve port 7a and the left oil inlet valve port 7b in the oil control valve cavity 7 are difficult to open, the flow 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 power steering pump is further reduced, and the torsion force required by the rotation of the steering wheel 18 is further increased. Therefore, in the process of high-speed driving of the automobile, the bypass channel 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 tightly holds the valve core 3 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, so that the torsion force required by the steering wheel 18 is greatly increased, and the problem of fluttering when the automobile is driven and steered at high speed is effectively prevented.

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 abuts against the two contact surfaces 3c1, so that the valve core 3 and the valve sleeve 2 are locked and cannot rotate relatively, at the moment, hydraulic oil in the oil control valve cavity 7 cannot enter the steering power cylinder 15, the auxiliary driving force is basically zero, and the main driving force required by the rotation of the steering wheel is the largest. When the oil pressure can not make the steel ball 6 abut against the two contact surfaces 3c1 at the same time, the valve core 3 and the valve sleeve 2 can rotate relatively, the hydraulic oil in the oil control valve cavity 7 can enter the steering power cylinder 15, the auxiliary driving force is related to the oil pressure received by the steel ball 6, and therefore the auxiliary driving force can be adjusted by adjusting the opening of the flow adjusting valve 9, and the torsion force required by the rotation of the steering wheel 18 is changed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A steering control valve comprises a valve body (1), a valve sleeve (2) is installed 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 face of the valve core (3) and the inner side face of the valve sleeve (2), the valve body (1) is provided with 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 communicated with the oil control valve cavity (7), the steering control valve is characterized in that the valve sleeve (2) comprises an adjusting part (2b), an annular adjusting cavity (2b1) is arranged between the outer side face of the adjusting part (2b) and the inner side face of the valve body (1), a bypass channel (1f) communicated with the oil inlet hole (1a) and the adjusting cavity (2b1) is arranged on the valve body (1), and a flow adjusting valve (9) is connected, evenly be provided with several through-hole (2b2) along circumference on regulation portion (2b), the inner and oil gallery (1b) intercommunication of through-hole (2b2), install mobilizable steel ball (6) in through-hole (2b2), the inside portion of steel ball (6) can support and lean on the lateral surface of case (3).

2. The steering control valve according to claim 1, characterized in that the valve core (3) is provided on its outer side with a caulking groove (3c) corresponding to the through hole (2b2) one by one, the side wall surfaces on both sides of the caulking groove (3c) are provided with contact surfaces (3c1) arranged obliquely, and the inner side of the steel ball (6) can be inserted into the caulking groove (3c) and abut against at least one contact surface (3c 1).

3. The steering control valve according to claim 2, wherein an annular fixing groove (2b3) intersecting the through hole (2b2) is formed in an outer side surface of the adjusting portion (2b), a snap ring (2b4) is fixed in the fixing groove (2b3), and a movable gap (2b5) is formed between the snap ring (2b4) and the steel ball (6).

4. The steering control valve according to any one of claims 1 to 3, wherein an oil passing cavity (8) is arranged between the inner side surface of the adjusting portion (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), the oil passing cavity (8) is separated from the oil control valve cavity (7) through a sealing ring (20), an opening (8a) is formed in the upper end of the oil passing cavity (8), and the oil passing cavity (8) is communicated with the oil return hole (1b) through the opening (8 a).

5. The steering control valve according to claim 4, characterized in that a return chamber (1e) is provided in the valve body (1) above the regulating portion (2b), and a return passage (1g) communicating the return chamber (1e) with the oil return hole (1b) is provided in a side wall of the valve body (1).

6. The steering control valve according to claim 4, characterized in that the regulating portion (2b) is further provided with an additional hole (2d) communicating the regulating chamber (2b1) and the oil passage chamber (8).

7. The steering control valve according to claim 4, characterized in that an inner hole (3a) is formed in the valve core (3), the lower end of the inner hole (3a) is communicated with the oil return hole (1b), and an auxiliary hole I (3d) for communicating the oil control valve cavity (7) with the inner hole (3a) and an auxiliary hole II (3e) for communicating the oil cavity (8) with the inner hole (3a) are formed in the side wall of the valve core (3).