CN108980258B

CN108980258B - Magneto-rheological damping regulating valve

Info

Publication number: CN108980258B
Application number: CN201810743124.7A
Authority: CN
Inventors: 谢方伟; 曹金鑫; 孙俊雨; 柯俊; 赵呈向; 张兵
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2018-07-09
Filing date: 2018-07-09
Publication date: 2020-07-31
Anticipated expiration: 2038-07-09
Also published as: CN108980258A

Abstract

The invention discloses a magneto-rheological damping regulating valve which comprises a piston main body, a sealing ring, a piston base, a flow valve component, an extrusion valve component and the like. The circulation valve component comprises a nut, a limiting block, a circulation valve plate group and the like. The limiting block and the circulation valve plate group are fixed on the piston main body through nuts; the extrusion valve assembly comprises a throttling valve core, an extrusion valve body, a coil, magnetorheological fluid, a return spring and the like. The extrusion valve body, the throttling valve core, the coil and the reset spring are packaged in the extrusion valve body through the thread fit between the piston base and the extrusion valve, and the valve can be applied to single-cylinder and double-cylinder shock absorbers. The magnetorheological fluid damper has the advantages of less usage amount of the magnetorheological fluid, capability of active control, stepless adjustable damping, fast dynamic response and the like, can effectively improve the comfort and the safety of a vehicle, and simultaneously meets the individual requirements of driving.

Description

Magneto-rheological damping regulating valve

Technical Field

The invention relates to a damping regulating valve which can be used in the field of single-cylinder and double-cylinder shock absorbers, in particular to a magnetorheological damping regulating valve for a shock absorber, which enables the damping characteristic of the shock absorber to change along with the working condition.

Background

The driving comfort and the safety of the automobile are regarded as a pair of natural contradictions, the comfort requires the shock absorber to provide softer damping force, and the driving safety requires the shock absorber to provide larger damping force. When the up-and-down movement speed of the suspension is high and the acceleration is high, the damping is also high, and when the up-and-down movement speed of the suspension is low and the acceleration is low, the damping is low, so that the vehicle has good running smoothness and maneuverability. When the traditional passive shock absorber is faced with the contradiction, the traditional passive shock absorber usually only adopts a scheme of invariant strain, namely a 'compromise', and faces complicated road conditions and different driving habits with a fixed damping coefficient, so that the reduction of comfort and the reduction of maneuverability are often caused.

Therefore, the semi-active and active suspension technology popular in recent years can adjust the rigidity and the damping of the suspension in real time according to the road condition, so that the suspension is in the optimal vibration damping state, and the driving comfort and the safety of the automobile are improved. For example, the patent publication No. CN106015434A and the patent application No. CN201710499846.8 disclose a damping polar adjustable shock absorber, which can select several preset damping gears, but cannot achieve stepless damping adjustment; the patent with application number CN201710306815.6 and publication number CN204113993U discloses a magneto-rheological damper, which can adjust damping steplessly, but needs to be filled with magneto-rheological fluid in a working cylinder, and the magneto-rheological fluid is more in need and higher in cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the magnetorheological damping regulating valve for the vibration damper, which has the advantages of small usage amount of magnetorheological fluid, stepless and adjustable damping, quick dynamic response and capability of active control.

In order to realize the purpose, the invention adopts the technical scheme that: a magneto-rheological damping regulating valve comprises a cylinder body, wherein a piston main body and a piston base are arranged in the cylinder body, a rod cavity is arranged above the piston main body, a rodless cavity is arranged below the piston base, an oil passage H is arranged on the piston base, and the oil passage H is communicated with the rodless cavity; a first circulation channel A, a second circulation channel B and a third circulation channel C are formed in the piston main body, the upper side of the third circulation channel C is connected with a circulation valve assembly, the circulation valve assembly is located in the rod cavity, the first circulation channel A is communicated with the rod cavity, the second circulation channel B is communicated with the first circulation channel A, the lower side of the third circulation channel C is communicated with the oil channel H, a squeeze valve body is embedded between the piston main body and the piston base, a recovery channel D is formed between the outer wall surface of the squeeze valve body and the inner wall surface of the piston main body in a surrounding mode, and the recovery channel D is simultaneously communicated with the oil channel H and the second circulation channel B; the extrusion valve is characterized in that a coil is arranged in the extrusion valve body, magnetorheological fluid is arranged in a sealed cavity surrounded by the coil, a throttling valve core simultaneously penetrates through the recovery channel D, the extrusion valve body, the magnetorheological fluid and the piston base, the throttling valve core can freely slide in a valve core movable cavity K in the piston base, a reset spring is arranged in the valve core movable cavity K, and the valve core movable cavity K is communicated with the rodless cavity through a circulation hole G.

In the above-mentioned scheme, the outer diameter of the throttle valve core is larger than the bore diameter of the second flow channel B.

In the above scheme, the flow valve assembly includes a nut, a limiting block and a flow valve plate set, the flow valve plate set is attached to the end C of the third flow passage, and the flow valve plate set is fixed to the piston main body through the limiting block and the nut.

In the scheme, a magnetism isolating ring is arranged between the coil and the magnetorheological fluid.

In the above scheme, sealing rings are respectively installed between the piston main body and the cylinder body, between the throttling valve core and the extrusion valve body, and between the throttling valve core and the piston base.

Compared with the prior art, the shock absorber damping adjusting valve provided by the invention has the following beneficial effects that: (1) according to the magneto-rheological damping regulating valve, the main working oil is still the hydraulic oil of the common shock absorber, and only a small amount of magneto-rheological fluid is used as the control fluid of the damping regulating valve, so that the use amount of the magneto-rheological fluid is reduced, and the cost of the magneto-rheological shock absorber is reduced. (2) The magneto-rheological damping regulating valve provided by the invention can realize the effects of stepless adjustable damping and quick dynamic response by combining with an electric control system, realizes semi-active control on an automobile suspension, effectively improves the comfort and safety of a vehicle on the basis of the semi-active control, and simultaneously meets the individual requirements of driving.

Drawings

FIG. 1 is a schematic cross-sectional view of a magnetorheological damping damper valve of the present invention.

Fig. 2 is a cross-sectional view of the piston body of the present invention.

FIG. 3 is a schematic diagram of the magnetic field distribution of a magnetorheological damping regulating valve of the present invention.

FIG. 4 is an oil flow diagram of the magnetorheological damping control valve in the compression stroke of the invention.

FIG. 5 is an oil flow diagram of a recovery stroke of a magneto-rheological damping regulating valve.

Wherein: 1-a piston body; 2-a nut; 3, a limiting block; 4-a flow-through valve plate set; 5-sealing ring; 6-throttle valve core; 7-a return spring; 8-a piston base; (ii) a 10-extruding the valve body; 11-a coil; 12-a magnetic isolation ring; 13-magnetorheological fluid; a-a first flow-through channel; b-a second flow-through channel; c-a third flow-through channel; d-a restoration channel; e-a rod cavity; f-rodless chamber; g-flow-through holes; an H-oil passage; i-extruding a valve component mounting cavity; j-piston base mounting cavity; k-valve core movable cavity.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

As shown in fig. 1, the magnetorheological damping regulating valve of the present invention includes a piston body 1, a seal ring 5, a piston base 8, a flow valve assembly, and a squeeze valve assembly. The circulation valve component comprises a nut 2, a limiting block 3 and a circulation valve plate group 4. The limiting block 3 and the circulation valve plate group 4 are fixed on the piston main body 1 through a nut 2; the squeeze valve assembly comprises a throttle valve core 6, a squeeze valve body 10, a coil 11, a magnetic isolation ring 12, magnetorheological fluid 13, a return spring 7 and the like. The throttle valve core 6, the coil 12 and the return spring 7 are sequentially packaged in the extrusion valve body 10 through the thread fit between the piston base 8 and the piston main body 1. Internal threads and a movable cavity K of the throttling valve core 6 are processed on the periphery of the piston base 8, a connecting through hole G communicated with the rodless cavity F is formed in the movable cavity K of the valve core, and the connecting through hole G ensures that the throttling valve core 6 can move on the valve body 10 of the extrusion valve. The lower part of the throttle valve core 6 is provided with a return spring 7 for cutting off a return passage D during a compression stroke. An oil passage H is formed in the position of the third flow passage C and the position of the recovery passage D of the piston base 8 and is used for oil circulation when compression and recovery are carried out. Oil is isolated between the piston main body 1 and the working cylinder through a sealing ring 5, and the sealing ring 5 is arranged between the throttle valve core 6 and the extrusion valve body 10 and between the throttle valve core and the piston base 8, so that the oil is prevented from entering a magnetorheological fluid 13 cavity. A sealing ring 5 is arranged between the extrusion valve body 10 and the piston base 8 to prevent oil from entering the coil 11.

In the compression stroke, as shown in fig. 1 and 4, the piston body 1 moves downwards, the pressure of the rod chamber E is reduced, the pressure of the rodless chamber F is increased, oil in the rodless chamber F backs up the circulating valve disc group through the third circulating channel C, a damping force of the compression stroke is provided for an automobile, meanwhile, due to the action of the return spring 7, the throttle valve disc 6 is closed with the piston body 1, and the intercepted oil enters the rod chamber E from the rodless chamber F through the restoring channel D, the second circulating channel B and the first circulating channel a.

In the recovery stroke, as shown in fig. 1 and 5, the piston main body 1 moves upwards, the pressure of the rod chamber E is increased, the pressure of the rodless chamber F is reduced, the oil in the rod chamber E passes through the first flow passage a and the second flow passage B to jack the throttle valve core 6, passes through the U-shaped recovery passage D to enter the rodless chamber F, and the throttle valve core 6 moves in the magnetorheological fluid 13 at the moment and is subjected to the damping force of the magnetorheological fluid 13. By changing the current of the coil 11 and changing the viscosity of the magnetorheological fluid 13, the resistance of the throttle valve core 6 during movement is changed, and the opening degree of the valve is adjusted. The running state of the vehicle is judged according to data of sensors such as a vehicle body acceleration sensor, a wheel acceleration sensor, a speed sensor and a transverse acceleration sensor on the vehicle, the central control unit ECU performs calculation, and then the ECU sends corresponding instructions to a coil 11 on a shock absorber to control the opening of a valve so as to provide damping suitable for the current state.

The above-described embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims

1. The magneto-rheological damping regulating valve comprises a cylinder body and is characterized in that a piston main body (1) and a piston base (8) are arranged in the cylinder body, a rod cavity is arranged above the piston main body (1), a rodless cavity is arranged below the piston base (8), an oil liquid channel H is arranged on the piston base (8), and the oil liquid channel H is communicated with the rodless cavity; a first circulation channel A, a second circulation channel B and a third circulation channel C are formed in the piston main body (1), the upper portion of the third circulation channel C is connected with a circulation valve assembly, the circulation valve assembly is located in the rod cavity, the first circulation channel A is communicated with the rod cavity, the second circulation channel B is communicated with the first circulation channel A, the lower portion of the third circulation channel C is communicated with the oil channel H, a squeeze valve body (10) is embedded between the piston main body (1) and the piston base (8), a recovery channel D is formed between the outer wall surface of the squeeze valve body (10) and the inner wall surface of the piston main body (1) in a surrounding mode, and the recovery channel D is communicated with the oil channel H and the second circulation channel B at the same time; the extrusion valve is characterized in that a coil (11) is arranged in the extrusion valve body (10), magnetorheological fluid (13) is arranged in a sealed cavity surrounded by the coil (11), a throttling valve core (6) penetrates through the restoration channel D, the extrusion valve body (10), the magnetorheological fluid (13) and the piston base (8) at the same time, the throttling valve core (6) can freely slide in a valve core movable cavity K in the piston base (8), a reset spring (7) is arranged in the valve core movable cavity K, and the valve core movable cavity K is communicated with the rodless cavity through a circulation hole G.

2. The magneto-rheological damping control valve according to claim 1, characterized in that the outer diameter of the throttle valve core (6) is larger than the bore diameter of the second flow channel B.

3. The magneto-rheological damping regulating valve according to claim 1 or 2, characterized in that the flow-through valve assembly comprises a nut (2), a limiting block (3) and a flow-through valve set (4), the flow-through valve set (4) is attached to the end C of the third flow-through channel, and the flow-through valve set (4) is fixed on the piston main body (1) through the limiting block (3) and the nut (2).

4. A magneto-rheological damping regulating valve according to claim 1 or 2, characterized in that a magnetism isolating ring (12) is arranged between the coil (11) and the magneto-rheological fluid (13).

5. The magneto-rheological damping adjusting valve according to claim 1 or 2, characterized in that sealing rings (5) are respectively installed between the piston main body (1) and the cylinder body, between the throttling valve core (6) and the squeeze valve body (10), and between the throttling valve core (6) and the piston base (8).