Shear mode magneto-rheological damper of automotive suspension

Abstract

The shear mode magneto-rheological damper is characterized by comprising a cylindrical damper shell, a working cylinder is arranged at the lower end of the damper shell, a sleeve is further installed in the damper shell through a bearing piece, the upper end of the sleeve is open, a limiting structure is arranged in the sleeve, and the working cylinder is arranged in the working cylinder. The sleeve is correspondingly provided with a ball screw through an internal limiting structure, a lead screw nut is further arranged at the upper end of the shock absorber shell, the upper end of the ball screw penetrates through the lead screw nut and then extends out of the upper end of the shock absorber shell, and a connecting hanging ring and a nut which are used for being connected with external equipment are arranged at the rod end of the ball screw. According to the device, linear motion generated when the vehicle suspension vibrates is converted into rotary motion, the purpose of generating damping is achieved by shearing the magnet exciting coil through the working rotor, therefore, the purpose of vibration reduction is achieved, the structural design is ingenious and reasonable, and the vibration reduction effect is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers in the automobile field, in particular to a shear mode magnetorheological shock absorber for automobile suspension. Background Art

[0002] In the prior art, a certain vibration will be generated when the car is running, so it is necessary to set up a vibration reduction mechanism for the car suspension. For example, the technical solution of the publication (announcement) number: CN1435582A discloses "a gas vehicle suspension shock absorber". The technical solution includes a main airbag cylinder, an auxiliary airbag cylinder, and a shock-absorbing cylinder that work simultaneously under the connection of a fixed shaft through a slide groove. After the main airbag cylinder exceeds the specified gravity and impact force, it and the auxiliary airbag cylinder share the responsibility. The gas suspension has good elasticity, and the shock-absorbing cylinder uses the force generated by the vacuum to complete the instantaneous resistance required by the shock absorber, so the vibration reduction effect is better. At the same time, all vibration forces generated by the wheels of the vehicle during driving are isolated, and the comfort feeling is strong, the process is simple, the cost is low, the service life is long, and it is suitable for various vehicles.

[0003] The above technical solution mainly adopts the structure of auxiliary airbags to achieve vibration reduction. For example, the technical solution with publication (announcement) number: CN112283286A discloses "a vehicle suspension vibration reduction system". This technical solution mainly adopts signal collection in information technology and setting vibration reduction modules and other technical means to achieve vibration reduction, which has the characteristics of rapid response.

[0004] However, the above technical solution is not effective enough in reducing the vibration of the vehicle suspension. In particular, the vehicle suspension in the prior art is usually designed with a mechanical structure for vibration reduction. The vehicle suspension should be designed with vibration reduction from the perspective of mechanical design.

[0005] Therefore, in order to solve the above problems, it is necessary to develop a shear mode magnetorheological shock absorber for automobile suspension with a reasonable structure that can effectively improve the vibration reduction effect. Summary of the invention

[0006] The purpose of the utility model is to provide a shear mode magnetorheological shock absorber for automobile suspension in view of the shortcomings of the prior art; the technical solution is as follows:

[0007] A shear mode magnetorheological shock absorber for automobile suspension, characterized in that: it comprises a tubular shock absorber housing, a working cylinder is arranged at the lower end of the shock absorber housing, a sleeve is installed in the shock absorber housing through a bearing member, the upper end of the sleeve is open and a limiting structure is arranged inside, a ball screw is correspondingly installed in the sleeve through the internal limiting structure, and a screw nut is also arranged at the upper end of the shock absorber housing, the upper end of the ball screw passes through the screw nut and then extends from the upper end of the shock absorber housing, and a connecting ring and a nut for connecting with external equipment are arranged at the rod end;

[0008] The lower end of the sleeve is provided with an integral connecting rod, and the connecting rod extends downward into the working cylinder; the working cylinder comprises a cylindrical working cylinder outer cylinder, and a working cylinder sealing plate is provided at the upper end of the working cylinder outer cylinder, and the working cylinder is sealed by the cooperation of the working cylinder outer cylinder and the working cylinder sealing plate, and the working cylinder is also filled with magnetorheological fluid, and an iron core is also provided in the working cylinder outer cylinder, and an excitation coil is installed on the iron core;

[0009] The connecting rod of the sleeve extends downward into the working cylinder, and passes through the internal iron core and the outer cylinder of the working cylinder respectively, and is fixed to the lower end of the shock absorber housing through a bearing. A working rotor is also installed on the connecting rod. The working rotor is located in the working cylinder, has a cylindrical structure as a whole, and is located on the outside of the excitation coil to fit the excitation coil as a whole inside. The inner and outer walls of the working rotor are in contact with the magnetorheological fluid. When the connecting rod drives the working rotor to rotate, the working rotor correspondingly shears the excitation coil and correspondingly stirs the magnetorheological fluid.

[0010] Furthermore, the limiting structure includes a limiting groove arranged on the inner wall of the sleeve and a limiting block arranged on the ball screw, and the limiting block is correspondingly embedded in the limiting groove, so that the ball screw can move up and down in the sleeve and can drive the sleeve to rotate accordingly.

[0011] Furthermore, a buffer block is installed on the upper end of the ball screw, and the buffer block is located at the lower side end of the connecting ring.

[0012] Furthermore, a shock absorber bottom cover is also installed at the lower end of the shock absorber housing; and the shock absorber bottom cover is detachably installed by fasteners.

[0013] Furthermore, a power supply device is installed on the shock absorber housing. The power supply device is located at the sealing plate of the working cylinder and supplies power to the excitation coil in the iron core through a power line.

[0014] Furthermore, a magnetic isolation aluminum plate is also provided on the lower end surface of the working cylinder sealing plate.

[0015] Furthermore, the upper and lower shaft sides of the connecting rod corresponding to the working rotor are respectively provided with adjusting washers; and the connecting rod outer tube is provided with an adjusting washer at the joint installation position with the connecting rod.

[0016] Furthermore, a spring sealing ring is also provided at the working cylinder sealing plate of the working cylinder and the contact position between the working cylinder outer tube and the connecting rod.

[0017] Beneficial effects: The utility model has the following beneficial effects:

[0018] 1) This device converts the linear motion generated by the vibration of the vehicle suspension into rotational motion, and achieves the purpose of damping by shearing the excitation coil through the working rotor, thereby achieving the purpose of vibration reduction. The structural design is ingenious and reasonable, and effectively improves the vibration reduction effect;

[0019] 2) In this device, the process of converting the linear motion of the ball screw into the rotational motion of the sleeve and the connecting rod is realized through the combined structure of the ball screw, the screw nut and the sleeve, and the structural design is ingenious;

[0020] 3) In this device, the connecting rod can drive the working rotor to rotate accordingly, and a working cylinder is set accordingly to specifically install the iron core and the excitation coil on the iron core, and magnetorheological fluid is set in the working cylinder through the cooperation of various washers, so as to achieve cooperation with the working rotor, and the structural design is reasonable;

[0021] 4) The working rotor of this device is designed as a cylindrical structure with a thin wall thickness. The inner and outer walls of the cylinder are in contact with the magnetorheological fluid phase, which can make its shear area as large as possible; and the magnitude of the magnetic field strength is closely related to the magnitude of the excitation current, the magnetic conductivity of the material, the magnetic circuit design, the magnetic isolation design, etc. Therefore, the excitation current is increased, materials with good magnetic conductivity are selected, the magnetic circuit design is optimized, and the magnetic isolation effect is optimized to enhance the magnetic field strength as much as possible, thereby ensuring a stronger damping force output of the magnetorheological damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the structural diagram of the utility model;

[0023] Figure 2 This is a structural diagram of the working cylinder in the utility model;

[0024] Figure 3 It is a schematic diagram of the limiting structure in the utility model. DETAILED DESCRIPTION

[0025] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, a magnetorheological shock absorber for shear mode of automobile suspension is characterized in that: it includes a cylindrical shock absorber housing 101, a working cylinder 102 is arranged at the lower end of the shock absorber housing 101, and a sleeve 5 is installed in the shock absorber housing 101 through a bearing member 7, the upper end of the sleeve 5 is open and a limiting structure is arranged inside, the sleeve 5 is correspondingly installed with a ball screw 6 through the internal limiting structure, and a screw nut 4 is also arranged at the upper end of the shock absorber housing 101, the upper end of the ball screw 6 passes through the screw nut 4 and then extends from the upper end of the shock absorber housing 101, and the rod end is provided with a connecting ring 1 and a nut 2 for connecting with external equipment;

[0027] The lower end of the sleeve 5 is provided with an integral connecting rod 501, and the connecting rod 501 extends downward into the working cylinder 102; the working cylinder 102 includes a cylindrical working cylinder outer cylinder 11, and a working cylinder sealing plate 103 is provided at the upper end of the working cylinder outer cylinder 11. The working cylinder outer cylinder 11 and the working cylinder sealing plate 103 cooperate to make the inside of the working cylinder 102 sealed, and the working cylinder 102 is also filled with magnetorheological fluid, and the working cylinder outer cylinder 11 is also provided with an iron core 104, and an excitation coil 13 is installed on the iron core 104;

[0028] The connecting rod 501 of the sleeve 5 extends downward into the working cylinder 102, and passes through the internal iron core 104 and the working cylinder outer cylinder 11 respectively, and is fixed to the lower end of the shock absorber housing 101 through the bearing member 7. A working rotor 12 is also installed on the connecting rod 501. The working rotor 12 is located in the working cylinder 102, and has a cylindrical structure as a whole. It is located on the outside of the excitation coil 13 and the excitation coil 13 is integrally mounted inside. The inner and outer walls of the working rotor 12 are in contact with the magnetorheological fluid. When the connecting rod 501 drives the working rotor 12 to rotate, the working rotor 12 correspondingly shears the excitation coil 13 and correspondingly stirs the magnetorheological fluid.

[0029] The limiting structure includes a limiting groove 51 arranged on the inner wall of the sleeve 5 and a limiting block 61 arranged on the ball screw 6. The limiting block 61 is correspondingly embedded in the limiting groove 51, so that the ball screw 6 can move up and down in the sleeve 5 and can drive the sleeve 5 to rotate accordingly.

[0030] A buffer block 3 is also installed at the upper end of the ball screw 6, and the buffer block 3 is located at the lower side end of the connecting ring 1; a shock absorber bottom cover 16 is also installed at the lower end of the shock absorber housing 101; and the shock absorber bottom cover is detachably installed by fasteners.

[0031] A power supply device 9 is also installed on the shock absorber housing 101. The power supply device 9 is located at the position of the working cylinder sealing plate 103 and supplies electricity to the excitation coil 13 in the iron core 104 through a power line.

[0032] The lower end surface of the working cylinder sealing plate 103 is also provided with a magnetic isolation aluminum plate 10; the upper and lower axial sides of the connecting rod 501 corresponding to the working rotor 12 are respectively provided with adjustment washers 15; and the connecting rod 501 is provided with an adjustment washer 15 at the joint installation position of the working cylinder outer tube 11 and the connecting rod 501.

[0033] A spring sealing ring 8 is also provided at the contact position between the working cylinder sealing plate 103 of the working cylinder 102 and the working cylinder outer tube 11 and the connecting rod 501 .

[0034] The working principle of the device is as follows: The device converts the up and down linear motion between the inner and outer cylinders of the traditional shock absorber into the rotational motion of the working rotor in the working cylinder through a ball screw structure to achieve vibration reduction.

[0035] A connecting ring is installed at the upper end of the ball screw, which is connected to the vehicle body through the connecting ring. The ball screw is equipped with a ball nut in the shock absorber housing. The ball nut makes the position of the ball screw more stable. The ball screw is embedded in the sleeve, and the sleeve is fixed in the shock absorber housing through a bearing. The sleeve becomes a solid connecting rod at the lower end and penetrates into the working cylinder of the magnetorheological shock absorber, and is fixedly connected to the working rotor that shears the magnetorheological fluid.

[0036] The connecting rod extends out of the working cylinder and is fixed at the lower end of the shock absorber housing through a bearing. The working rotor is a cylindrical structure, and its inner and outer walls are in contact with the magnetorheological fluid. The magnetorheological fluid is sealed in the working cylinder through a spring sealing ring.

[0037] The specific shape and structure of the working cylinder includes a cylindrical working cylinder outer cylinder, the upper end of which is closed by a working cylinder sealing plate, an iron core is arranged inside and an excitation coil is installed through the iron core, and the working rotor cooperates with the magnetic coil accordingly.

[0038] When the vehicle encounters bumps during driving, the wheels and the body are displaced, and the ball screw connected to the body moves up and down in the outer cylinder of the shock absorber. Under the restriction of the ball nut, the up and down linear motion of the ball screw is converted into rotational motion. At the same time, the ball screw drives the sleeve to rotate under the action of the limiting structure in the sleeve, so that the sleeve drives the connecting rod at the lower end to rotate, and the corresponding connecting rod drives the working rotor to rotate in the working cylinder.

[0039] When the excitation coil located on the iron core in the working cylinder of the shock absorber is energized, the magnetorheological fluid exhibits Bingham fluid mechanics characteristics. At this time, the rotating working rotor shears the magnetorheological fluid to generate the damping force required by the shock absorber. The viscosity of the magnetorheological fluid increases with the increase of the magnetic induction intensity. By increasing the current in the excitation coil, the purpose of increasing the viscosity of the magnetorheological fluid when working can be achieved, that is, the shear yield stress of the magnetorheological fluid increases, and ultimately a larger damping force is obtained for the shock absorber output, thereby effectively achieving the purpose of vibration reduction.

[0040] The magnetorheological damper in this device is based on the shear mode, so the shear area and magnetic field strength of the magnetorheological fluid are important factors affecting the damping force; this device designs the working rotor as a cylindrical structure with a thin wall thickness, and the inner and outer walls of the cylinder are in contact with the magnetorheological fluid, so that the shear area can be as large as possible; and the magnitude of the magnetic field strength is closely related to the magnitude of the excitation current, the magnetic conductivity of the material, the magnetic circuit design, the magnetic isolation design, etc., so the excitation current is increased, the material with good magnetic conductivity is selected, the magnetic circuit design is optimized, and the magnetic isolation effect is optimized, so that the magnetic field strength is enhanced as much as possible, thereby ensuring a stronger damping force output of the magnetorheological damper.

[0041] The above-mentioned specific implementation mode is only a preferred embodiment of the present invention and is not intended to limit the implementation of the present invention and the scope of the claims. All equivalent changes and modifications made according to the content of the patent protection scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A shear mode magnetorheological damper for automobile suspension, characterized in that: The invention comprises a cylindrical shock absorber housing (101), a working cylinder (102) being arranged at the lower end of the shock absorber housing (101), a sleeve (5) being installed in the shock absorber housing (101) via a bearing member (7), the upper end of the sleeve (5) being open and having a limiting structure arranged therein, a ball screw (6) being correspondingly installed in the sleeve (5) via the limiting structure therein, and a screw nut (4) being arranged at the upper end of the shock absorber housing (101), the upper end of the ball screw (6) passing through the screw nut (4) and extending out from the upper end of the shock absorber housing (101), and a connecting ring (1) and a nut (2) being arranged at the rod end for connecting to an external device; The lower end of the sleeve (5) is provided with an integral connecting rod (501), and the connecting rod (501) extends downward into the working cylinder (102); the working cylinder (102) comprises a cylindrical working cylinder outer cylinder (11), and a working cylinder sealing plate (103) is provided at the upper end of the working cylinder outer cylinder (11); the working cylinder outer cylinder (11) and the working cylinder sealing plate (103) cooperate to make the interior of the working cylinder (102) sealed, and the working cylinder (102) is also filled with magnetorheological fluid; an iron core (104) is also provided in the working cylinder outer cylinder (11), and an excitation coil (13) is installed on the iron core (104); The connecting rod (501) of the sleeve (5) extends downward into the working cylinder (102), and passes through the internal iron core (104) and the working cylinder outer cylinder (11) respectively, and is fixed to the lower end of the shock absorber housing (101) through a bearing member (7), and a working rotor (12) is also installed on the connecting rod (501). The working rotor (12) is located in the working cylinder (102), has a cylindrical structure as a whole, and is located outside the excitation coil (13) to enclose the excitation coil (13) as a whole inside, and the inner and outer walls of the working rotor (12) are in contact with the magnetorheological fluid. When the connecting rod (501) drives the working rotor (12) to rotate, the working rotor (12) correspondingly shears the excitation coil (13) and correspondingly stirs the magnetorheological fluid.

2. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: The limiting structure comprises a limiting groove (51) arranged on the inner wall of the sleeve (5) and a limiting block (61) arranged on the ball screw (6); the limiting block (61) is correspondingly embedded in the limiting groove (51), so that the ball screw (6) can move up and down in the sleeve (5) and can drive the sleeve (5) to rotate accordingly.

3. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: A buffer block (3) is also installed at the upper end of the ball screw (6), and the buffer block (3) is located at the lower side end of the connecting ring (1).

4. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: A shock absorber bottom cover (16) is also installed at the lower end of the shock absorber housing (101); and the shock absorber bottom cover (16) is detachably installed via fasteners.

5. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: A power supply device (9) is also installed on the shock absorber housing (101). The power supply device (9) is located at the position of the working cylinder sealing plate (103) and supplies electricity to the excitation coil (13) in the iron core (104) through a power line.

6. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: A magnetic isolation aluminum plate (10) is also provided on the lower end surface of the working cylinder sealing plate (103).

7. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: Adjustment washers (15) are provided on the upper and lower shaft sides of the connecting rod (501) corresponding to the installation of the working rotor (12); and an adjustment washer (15) is provided at the joint installation position between the working cylinder outer tube (11) and the connecting rod (501).

8. The shear mode magnetorheological damper for automobile suspension according to claim 1, characterized in that: A spring sealing ring (8) is also provided at the contact position between the working cylinder sealing plate (103) of the working cylinder (102) and the working cylinder outer tube (11) and the connecting rod (501).

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