CN104290809B - Hydraulic power steering gear assistance adjustment device - Google Patents

Abstract

The invention relates to a power assist adjustment device for a hydraulic power steering gear, comprising a valve core, an adjusting seat body, a valve sleeve, a steering gear end cover, a four-position four-way solenoid valve, and a steering pump; The body is installed in the valve sleeve and has an interference fit. The lug on the valve core is located in the fan-shaped groove cavity of the adjustment seat body; the two radial planes of the steering gear end cover are respectively provided with a second annular oil groove and an oil passage. , the four-position four-way solenoid valve is connected to the steering pump and the two oil passages respectively; the first annular oil groove and the oil hole communicating with it are respectively arranged in the two radial planes of the valve sleeve; the two diameters of the adjusting seat body Second through holes communicating with the fan-shaped grooves are respectively provided in the outward planes, and piston push rods are arranged in each of them, and the force directions of the piston push rods located in the two radial planes are opposite. The device of the invention is novel and compact, has simple processing and is easy to control, effectively reduces the "floating" phenomenon of the steering wheel when the vehicle runs at high speed, and improves the driving safety of the vehicle.

Description

A hydraulic power steering gear assist adjustment device

technical field

The invention belongs to the field of hydraulic power steering systems, in particular to a hydraulic power steering gear assist adjustment device.

Background technique

At present, the hydraulic power steering system is widely used in the power steering system of automobiles, but it cannot adjust the power assist as the vehicle speed changes. When the car is running at high speed, since the power assist of the steering gear does not decrease with the increase of the vehicle speed, the power assist on the steering wheel is close to the original position when steering at high speed, which makes the steering wheel too easy to operate and easily loses the road feeling, resulting in the problem of "floating" of the car, reducing the High-speed driving safety performance. Obviously, the traditional hydraulic power steering system cannot meet the current people's requirements for vehicle handling stability and safety.

In recent years, through technological innovation, some new devices have appeared to control the oil flow into the steering gear, so as to satisfy the lightness of steering at low speed and good road feeling at high speed. Chinese patent CN202624355U provides a speed-adjustable decompression power steering system, which adds an oil drain pump for intercepting part of the hydraulic oil delivered from the power booster pump to the steering gear on the basis of the existing hydraulic power steering system. And the power take-off port of the oil drain pump is connected to the transmission part of the vehicle, so that the flow rate of the oil drain pump increases or decreases with the vehicle speed; In this case, the steering wheel feels light; when the vehicle speed is high, the oil drain pump rotates at a high speed, the oil discharge capacity is large, the oil supplied to the steering gear and the steering cylinder is small, and the steering power is small, and the steering wheel feels stable in this case . However, it is difficult to conveniently and accurately select the position of the power take-off port of the oil drain pump in this scheme, and the installation is difficult at the same time. Chinese patent CN202294952U proposes to add a solenoid valve to the existing hydraulic power steering system. The ECU analyzes the vehicle speed signal and pressure signal to change the conduction and direction of the current in the coil winding of the solenoid valve, thereby controlling the piston inside the solenoid valve. , to push the piston away from the original position, forward or backward. When the piston is in the original position, the pressure of the oil in the system power cylinder is maintained, when the piston advances, it is pressurized, and when the piston retreats, it is decompressed, so as to realize the adjustable power assist. However, this scheme has higher requirements on the precision of the solenoid valve itself, and more stringent requirements on the controller.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a hydraulic power steering gear assist adjustment device, which has a compact structure and is easy to control, so as to eliminate the floating phenomenon of the steering wheel when the vehicle is running at high speed and improve the driving safety of the vehicle.

The present invention realizes the above-mentioned technical purpose through the following technical means.

A hydraulic power steering gear assist adjustment device, characterized in that it includes a valve core, an adjustment seat body, a valve sleeve, a steering gear end cover, a four-position four-way solenoid valve, and a steering pump;

The valve is set in the end cover of the steering gear, the adjusting seat is installed in the valve sleeve, and has an interference fit; the axis of the adjusting seat is provided with a first through hole, and the inner wall of the adjusting seat is provided with At least one fan-shaped groove cavity extending along the axis; the outer cylindrical surface of the valve core is provided with at least one lug extending along the axis; the valve core is installed in the first through hole of the adjustment seat, and the lug Located in the fan-shaped groove; the four-position four-way solenoid valve is connected with the steering pump;

Taking two radial planes, the two radial planes of the steering gear end cover are respectively provided with a second annular oil groove and an oil passage; the two oil passages located in the two radial planes are respectively connected to the four The four-way solenoid valve is connected; the two radial planes of the valve sleeve are respectively provided with a first annular oil groove and at least one oil hole communicating with the first annular oil groove; At least one second through hole communicating with the fan-shaped groove cavity is respectively provided, and the directions of the second through holes on the two radial planes are opposite; a piston push rod is arranged in the second through hole; the piston push rod The end is provided with at least one first ring groove, a piston gasket is embedded in the first ring groove, and the force directions of the piston push rods located in two radial planes are opposite.

Further, the number of lugs of the spool and the fan-shaped grooves on the inner wall of the adjustment seat are two and distributed symmetrically; the second through holes in the two radial planes of the adjustment seat are respectively The force application directions of the piston push rods arranged in the two second through holes located in the same radial plane are the same rotation direction.

Further, a limit snap ring is provided on the inner wall of the second through hole, and a spring is provided between the limit snap ring and the piston push rod.

Further, the end of the piston push rod and the end that can be in contact with the lug is hemispherical.

Further, the first annular oil groove is provided with four oil holes uniformly distributed along the circumferential direction.

Further, second annular grooves are formed on both sides of the second annular oil groove, and sealing rings are arranged in the second annular grooves.

Further, the width of the first annular oil groove is larger than the diameter of the second through hole. .

Beneficial effects of the present invention:

(1) By setting spool lugs, fan-shaped groove cavity, second through hole, piston push rod, first annular oil groove, second annular oil groove, oil hole, oil passage, etc., the hydraulic oil enters the second annular oil passage through the oil passage. The oil groove flows into the first annular oil groove from the oil hole, and then enters the second through hole to push the piston push rod to generate a force on the valve core lug, forming a resistance torque opposite to the actual steering wheel steering direction, and at the same time reducing the valve core and The relative rotation angle of the valve sleeve is used to reduce the power steering at medium and high speeds, and realize the adjustment of power assistance; the steering gear adjustment device is compact in structure and simple in process, which eliminates the phenomenon of steering wheel fluttering when the vehicle is running at high speed, and makes driving at medium and high speeds easier. The driver operates the steering wheel calmly, which improves the driving safety of the vehicle.

(2) A spring is provided in the second through hole to improve the followability of the movement of the piston push rod and the lug, and a limit snap ring is provided to limit the limit position of the backward movement of the piston push rod.

(3) By setting the first ring groove at the end of the piston push rod, inserting the piston gasket in it, sealing the pressure oil chamber of the piston push rod; setting the second ring groove on both sides of the second ring oil groove, placing the sealing ring, preventing oil fluid leaks. .

Description of drawings

Fig. 1 is an assembly drawing of a hydraulic power steering gear assembly equipped with the power assist adjustment device of the present invention.

Fig. 2 is an enlarged view of A in Fig. 1 .

Fig. 3 is a C-C sectional view in Fig. 2 of the present invention.

Fig. 4 is a D-D sectional view in Fig. 2 of the present invention.

Fig. 5 is a schematic diagram of the spool in the booster adjusting device of the present invention.

Fig. 6 is a cross-sectional view of the adjusting seat in the power assist adjusting device of the present invention.

Fig. 7 is a sectional view of F-F in Fig. 6 of the present invention.

Fig. 8 is a G-G sectional view in Fig. 7 of the present invention.

Fig. 9 is a cross-sectional view of the piston push rod in the power assist adjusting device of the present invention.

Fig. 10 is a working schematic diagram of the solenoid valve in the booster adjusting device of the present invention when the vehicle is running at a low speed.

Fig. 11 is a working schematic diagram of the solenoid valve in the booster adjusting device of the present invention when the vehicle is running straight at high speed.

Fig. 12 is a working schematic diagram of the solenoid valve in the booster adjusting device of the present invention when the vehicle turns right at high speed.

Fig. 13 is a working schematic diagram of the solenoid valve in the booster adjusting device of the present invention when the vehicle turns left at high speed.

The reference signs are explained as follows:

1-spool, 2-adjusting seat, 3-valve sleeve, 4-piston push rod, 5-steering gear end cover, 6-four-position four-way solenoid valve, 7-steering pump, 1a- lug, 2a- The first through hole, 2b-sector-shaped cavity, 2c-the second through hole, 2d-spring, 2e-limit snap ring, 3a-the first annular oil groove, 3b-oil hole, 4a-the first ring groove, 5a- The second annular oil groove, 5b1-the first oil passage, 5b2-the second oil passage.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

As shown in Figure 1, the hydraulic power steering gear assist adjustment device includes a valve core 1, an adjustment seat body 2, a valve sleeve 3, a steering gear end cover 5, a four-position four-way solenoid valve 6, and a steering pump 7; In the end cover 5 of the steering gear, the adjusting seat body 2 is installed in the valve sleeve 3 and has an interference fit, and the four-position four-way solenoid valve 6 is connected with the steering pump 7 .

As shown in Figure 2, the outer cylindrical surface of the valve core 1 is provided with a pair of plate-shaped lugs 1a extending symmetrically along the axis; The inner wall of the hole 2a is provided with a pair of fan-shaped grooves 2b extending symmetrically along the axis; the valve core 1 is installed in the first through hole 2a of the adjustment seat 2, and a pair of lugs 1a are located in the pair of grooves 2b , when the valve core 1 rotates relative to the valve sleeve 3, the lug 1a can move at a small angle in the fan-shaped groove cavity 2b.

Taking two radial planes, the two radial planes of the steering gear end cover 5 are respectively provided with a second annular oil groove 5a and an oil passage, and the two oil passages located in the two radial planes are connected with the four-position four-way solenoid valve respectively. 6 connection; a second annular groove 5c is respectively opened on both sides of the second annular oil groove 5a, and a sealing ring is arranged in it to prevent oil leakage. Two second through holes 2c communicating with the fan-shaped groove cavity 2b are respectively provided in the two radial planes of the adjusting seat 2, and the directions of the second through holes 2c on the above two radial planes are opposite; the second through holes 2c is provided with a piston push rod 4, which is hemispherical in shape with the end that can be in contact with the lug 1a, so that when the push rod pushes the lug to rotate around the center of the valve core, it can fit the lug better; The end of the piston push rod 4 is provided with a plurality of first ring grooves 4a, in which piston gaskets are embedded to seal the pressure oil chamber of the piston push rod 4; the second through hole 2c located in the same radial plane The force direction of the piston push rod 4 is the same direction of rotation, and the force direction of the piston push rod 4 located in two radial planes is opposite; the inner wall of the second through hole 2c is provided with a limit snap ring 2e, which is used to limit the piston push. The limit position of the backward movement of the rod; a spring 2d is provided between the limit snap ring 2e and the piston push rod 4, and the piston push rod is lightly pressed on the lug at all times to improve the followability of the movement of the push rod and the lug. The two radial planes of the valve sleeve 3 are respectively provided with a first annular oil groove 3a, on which are provided four oil holes 3b evenly distributed along the circumferential direction, the width of the first annular oil groove 3a is larger than that of the second through hole 2c diameter of.

Taking various driving conditions of automobiles as an example, the working process of the booster regulating device of the present invention is further described:

During the actual driving process, the controller controls the solenoid valve to open and close the oil passage according to the vehicle speed and rotation angle sensor, and performs oil passage switching and pressure adjustment;

When the vehicle is running at a low speed, the required steering power is relatively large. At this time, the controller closes the four-position, four-way solenoid valve 6 according to the control signal, and the power assist regulating device of the present invention does not work, as shown in FIG. 10 .

When the vehicle is running straight at medium speed, the controller controls the four-position four-way solenoid valve 6 to work in the two-way flow position, as shown in Figure 11. At this time, hydraulic oil is injected into the first oil passage 5b1 and the second oil passage 5b2. The hydraulic oil passes through the second annular oil groove 5a in the two radial planes, flows into the first annular groove 3a from the oil hole 3b, and then enters the second through hole 2c to push the piston push rod 4 to act on the spool lug 1a Force, forming a pair of equal and opposite moments, so that the driver can get a certain feel.

When the vehicle turns left at high speed, the controller controls the four-position four-way solenoid valve 6 to work in the position shown in Figure 12. At this time, the first oil passage 5b1 is the oil inlet passage, the second oil passage 5b2 is the oil return passage, and the hydraulic oil It enters the second annular oil groove 5a on the corresponding radial plane through the first oil passage 5b1, flows into the first annular annular groove 3a on the corresponding radial plane through the oil hole 3b, and then flows into the second through hole 2c to push the piston push rod 4 Generate a force on the lug 1a to form a rightward resistance moment to reduce the power steering, eliminate the phenomenon of steering wheel fluttering when the vehicle is running at high speed, and at the same time enable the driver to obtain a certain hand feeling when driving at high speed, improving the driving safety of the vehicle sex.

When the vehicle turns right at high speed, the controller controls the four-position four-way solenoid valve 6 to work in the position shown in Figure 13. At this time, the first oil passage 5b1 is the oil return passage, the second oil passage 5b2 is the oil inlet passage, and the hydraulic oil It enters the second annular oil groove 5a on the corresponding radial plane through the second oil passage 5b2, flows into the first annular annular groove 3a on the corresponding radial plane through the oil hole 3b, and then flows into the second through hole 2c to push the piston push rod 4 Generate a force on the lug 1a to form a leftward resistance moment to reduce the power steering, eliminate the phenomenon of steering wheel fluttering when the vehicle is running at high speed, and at the same time enable the driver to obtain a certain feel when driving at high speed, which improves the driving safety of the vehicle sex.

In addition, in the case of high-speed sharp steering, the controller can promptly and quickly close the valve port according to the vehicle speed signal and the signal of the steering angular velocity, so as to realize safety avoidance under emergency working conditions.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essence of the present invention, any obvious improvement, replacement or modification that those skilled in the art can make Modifications all belong to the protection scope of the present invention.

Claims (6)

1. a hydraulic power steering device assistance adjusting device, it is characterized in that, including spool (1), regulation pedestal (2), valve pocket (3), steering gear end cap (5), four position four-way solenoid valves (6), steering pump (7)；

In described valve pocket (3) is loaded on steering gear end cap (5), in described regulation pedestal (2) is loaded on valve pocket (3) and interference fit；Described regulation pedestal (2) axle center is provided with the first through hole (2a), and described regulation pedestal (2) inwall is provided with at least one fan-shaped vallecular cavity (2b) extended along axis；The outer cylinder surface of described spool (1) is provided with at least one journal stirrup (1a) extended along axis；Described spool (1) is arranged in first through hole (2a) of regulation pedestal (2), and described journal stirrup (1a) is positioned in fan-shaped vallecular cavity (2b)；Described journal stirrup (1a) and fan-shaped vallecular cavity (2b) are one-to-one relationship；Four position four-way solenoid valves (6) are connected with steering pump (7)；

Take two sagittal planes, in two sagittal planes of described steering gear end cap (5), be respectively equipped with the second annular oil groove (5a) and oil duct；Two oil ducts in said two sagittal plane are connected with four position four-way solenoid valves (6) respectively；First annular oil groove (3a) and at least one oilhole (3b) being connected with first annular oil groove (3a) it is respectively equipped with in two sagittal planes of described valve pocket (3)；Being respectively equipped with at least one second through hole (2c) communicated with fan-shaped vallecular cavity (2b) in two sagittal planes of described regulation pedestal (2), the second through hole (2c) on said two sagittal plane is in opposite direction；It is provided with piston push rod (4) in described second through hole (2c), described second through hole (2c) inwall is provided with limited location snap ring (2e), is provided with spring (2d) between described limited location snap ring (2e) and piston push rod (4)；Piston push rod (4) one end contacts with journal stirrup (1a)；Described piston push rod (4) end is provided with at least one first annular groove (4a), it is inlaid with piston pad in described first annular groove (4a), and the force direction being positioned at the piston push rod (4) of two sagittal planes is contrary.

Hydraulic power steering device assistance adjusting device the most according to claim 1, it is characterized in that, the quantity of the fan-shaped vallecular cavity (2b) on journal stirrup (1a) on described spool (1), regulation pedestal (2) inwall is two and symmetrical；The second through hole (2c) in two sagittal planes of described regulation pedestal (2) respectively two and the force direction being positioned in second through hole (2c) of same sagittal plane the piston push rod (4) arranged are same direction of rotation.

Hydraulic power steering device assistance adjusting device the most according to claim 1, it is characterised in that one end that described piston push rod (4) can contact with journal stirrup (1a) is hemispherical.

Hydraulic power steering device assistance adjusting device the most according to claim 1, it is characterised in that described first annular oil groove (3a) is provided with four oilholes (3b) being distributed uniformly and circumferentially.

Hydraulic power steering device assistance adjusting device the most according to claim 1, it is characterised in that described second annular oil groove (5a) both sides have the second annular groove (5c), are provided with sealing ring in described second annular groove (5c).

Hydraulic power steering device assistance adjusting device the most according to claim 1, it is characterised in that described first annular oil groove (3a) width is more than the diameter of the second through hole (2c).