Single-cylinder magnetorheological damper

Abstract

The utility model discloses a single-barrel magneto-rheological shock absorber which comprises a cylinder barrel body, a piston assembly and a floating piston assembly which are arranged in the cylinder barrel body, and an outer sleeve air cylinder arranged outside the cylinder barrel body in a sleeved mode, at least one vent hole set is arranged at the bottom of the cylinder barrel body, and an annular air chamber is formed between the outer sleeve air cylinder and the cylinder barrel body. When the floating piston assembly moves in the cylinder barrel body in the axial direction, gas exchange between the annular gas chamber and the inner cavity of the cylinder barrel body is achieved through the vent hole set, and the volume of the gas chamber is remarkably enlarged through the annular gas chamber formed by the outer sleeve gas cylinder and the cylinder barrel body. The problem of insufficient air chamber volume caused by space limitation of a single-cylinder structure is solved; meanwhile, only the outer sleeve air cylinder is arranged outside the cylinder barrel body in a sleeving mode, excessive structures cannot be additionally arranged, the overall structure of the shock absorber is compact, and extra space is not occupied.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetorheological damper especially relates to a single cylinder magnetorheological damper. BACKGROUND

[0002] The general magnetorheological damper structure includes outer cylinder assembly, guider assembly, piston assembly, floating piston assembly and spring disc, bushing, dust cover and other accessories. The piston assembly moves along the axial direction of the outer cylinder during the damper operation, and the floating piston moves up and down within a certain range. High-pressure gas is injected into the air chamber between the floating piston and the bottom cover to provide counterforce for the damper. However, when the air chamber space in the cylinder of the single cylinder magnetorheological damper is insufficient, the normal operation requirements of the damper cannot be met. Moreover, if the design height, stroke length, cylinder height, piston rod and other requirements of the actual vehicle damper are met, the volume of the magnetorheological damper air chamber will be insufficient. SUMMARY

[0003] The utility model discloses a single cylinder magnetorheological damper with sufficient air chamber and compact structure.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a single cylinder magnetorheological damper, which comprises a cylinder body, a piston assembly and a floating piston assembly arranged in the cylinder body, and an outer sleeve cylinder arranged outside the cylinder body. The bottom of the cylinder body is provided with at least one air hole group. An annular air chamber is formed between the outer sleeve cylinder and the cylinder body. The air hole group communicates the inner cavity of the cylinder body with the annular air chamber. When the floating piston assembly moves axially in the cylinder body, the gas exchange between the annular air chamber and the inner cavity of the cylinder body is realized through the air hole group.

[0005] In one embodiment, the air hole group comprises a plurality of axial holes uniformly distributed along the circumference of the cylinder body.

[0006] In one embodiment, the air hole group is provided with six air holes, and the diameter of each air hole is 2.5mm-3.5mm.

[0007] In one embodiment, the distance between the air hole group and the bottom end of the cylinder body is 6mm-12mm.

[0008] In one embodiment, the inner diameter of the outer sleeve cylinder is greater than the outer diameter of the cylinder body, and the outer sleeve cylinder is axially fixed with the cylinder body through a positioning assembly.

[0009] In one embodiment, the positioning assembly comprises an upper gasket arranged at the top of the outer sleeve cylinder and a lower gasket arranged at the bottom of the outer sleeve cylinder. The upper gasket is in interference fit with the outer sleeve cylinder, and the lower gasket is welded and fixed with the cylinder body and the outer sleeve cylinder.

[0010] One of the embodiments, the top of the sleeve cylinder is provided with a sealing assembly, and the sealing is pressed by a nut cover.

[0011] One of the embodiments, the bottom of the cylinder body is provided with a cylinder bottom cover, and a gap is arranged between the floating piston assembly and the cylinder bottom cover, and the axial distance of the gap is 3mm-7mm.

[0012] One of the embodiments, the outer surface of the sleeve cylinder is provided with an anti-interference groove.

[0013] One of the embodiments, the axis of the vent hole group is arranged at an inclination of 15°-45° to the axial direction of the cylinder body, and the edge of the hole is provided with a rounded corner.

[0014] After the above technical scheme, the utility model has the following advantages:

[0015] 1、In the utility model, the annular air chamber formed by the sleeve cylinder and the cylinder body significantly expands the air chamber volume, solving the problem of insufficient air chamber volume caused by space limitation in the single cylinder structure; the gas exchange mechanism of the vent hole group ensures the dynamic balance of the air pressure of the shock absorber in the compression and recovery stroke, avoiding the floating piston from touching the bottom or the air chamber pressure from suddenly changing, and improving the damping stability and reliability; at the same time, only by sleeving an outer sleeve cylinder on the outside of the cylinder body, without additional excessive structure, the overall structure of the shock absorber is compact, without occupying additional space.

[0016] 2、By uniformly distributing the vent hole group along the circumference of the cylinder body, the gas flow path is symmetrical, the local air pressure concentration is reduced, the uniform exchange of gas between the annular air chamber and the cylinder body is ensured, thereby reducing the vibration noise of the shock absorber during operation, and improving the smoothness of the floating piston movement.

[0017] 3、By arranging six vent hole groups, not only the balance of the number and size of the openings is optimized under the premise of meeting the gas exchange efficiency, but also the structural strength is avoided to be reduced due to the excessively large aperture or the gas flow resistance is avoided to be increased due to the excessively small aperture; the design takes into account the processing feasibility and the air pressure adjustment accuracy, and adapts to the air chamber pressure demand under different working conditions.

[0018] 4、By arranging the vent hole group in a reasonable range of 6mm-12mm from the bottom end, the interference of the bottom welding or sealing structure on the gas flow channel is avoided, and the sufficient space for gas exchange of the floating piston at the limit stroke is ensured, preventing the damping failure caused by the out-of-control air chamber pressure.

[0019] 5、The annular space formed by the difference between the inner diameter and the outer diameter maximizes the air chamber volume, the positioning assembly ensures the coaxiality of the sleeve cylinder and the cylinder body, avoiding uneven distribution of the air chamber due to assembly deviation; the axial fixation design enhances the rigidity of the overall structure, reducing the influence of vibration transmission on the air chamber sealing performance.

[0020] 6、The interference fit of the upper gasket provides initial positioning and pre-tightening force to prevent the air cylinder from loosening in vibration; the welding of the lower gasket enhances the axial load capacity and ensures the air chamber sealing; the split positioning design simplifies the assembly process and reduces production cost.

[0021] 7、The nut cover compression sealing assembly forms a double sealing barrier to prevent high-pressure gas leakage; the detachable structure facilitates later maintenance or air chamber pressure adjustment, improving the maintainability and service life of the product.

[0022] 8、By reserving a gap of 3mm-7mm, the floating piston is prevented from directly contacting the bottom cover during the extreme compression stroke, preventing mechanical collision damage; this gap range has been optimized and verified to ensure the effective volume of the air chamber and avoid reduced gas exchange efficiency due to excessive gap.

[0023] 9、By setting an anti-interference groove, space is provided for other components of the suspension system, reducing the risk of friction or wear caused by structural interference after installation; the groove design also enhances the heat dissipation capacity of the air cylinder outer surface, avoiding the impact of high temperature on the performance of the magnetorheological fluid.

[0024] 10、By designing an inclined angle to guide gas flow along a spiral path, airflow impact noise is reduced and exchange efficiency is improved; the rounded corner structure eliminates stress concentration at the orifice, extending the service life of the vent hole and reducing the interference of machining burrs on airflow. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further described below in conjunction with the drawings:

[0026] Figure 1 The utility model discloses a single-cylinder magnetorheological shock absorber Figure One .

[0027] Figure 2 The utility model discloses a single-cylinder magnetorheological shock absorber Figure Two .

[0028] Figure 3 The utility model discloses a single-cylinder magnetorheological shock absorber

[0029] Figure 4 The utility model discloses a single-cylinder magnetorheological shock absorber

[0030] The names of the components marked in the drawings are as follows:

[0031] 1, cylinder body; 11, vent hole group; 12, inner cavity; 13, cylinder bottom cover; 2, piston assembly; 3, floating piston assembly; 4, sleeve cylinder; 41, anti-interference groove; 5, annular air chamber; 61, upper gasket; 62, lower gasket; 71, first sealing ring; 72, second sealing ring; 8, nut cover. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the overall concept of the utility model, the following will be combined with the description of the drawings in an exemplary manner to make a detailed description.

[0033] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from those described herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0034] In addition, in the description of the utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0035] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. However, it is pointed out that direct connection means that the connection between the two main bodies does not form a connection relationship through an excessive structure, but is connected only through a connection structure to form a whole. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly contacted through an intermediate medium. In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] As shown in Figures 1 to 4 The utility model provides a single cylinder magneto rheological damper, including cylinder body 1, be located in cylinder body 1's piston assembly 2 and floating piston assembly 3 and the sleeve gas cylinder 4 of setting in cylinder body 1 outside, the bottom of cylinder body 2 is equipped with at least one vent hole group 11, and the sleeve gas cylinder 4 forms annular air chamber 5 with cylinder body 1, and vent hole group 11 communicates the inner chamber 12 of cylinder body 1 with annular air chamber 5, when floating piston assembly 3 moves in cylinder body 1 along the axial direction, through vent hole group 11, the gas exchange of annular air chamber 5 and the inner chamber 12 of cylinder body 1 is realized, through the annular air chamber formed by the sleeve gas cylinder and cylinder body, the air chamber volume is significantly expanded, the problem that the air chamber volume is insufficient due to space limitation of single cylinder structure is solved, the gas exchange mechanism of vent hole group guarantees the dynamic balance of air pressure in compression and recovery stroke of damper, avoids floating piston to touch the bottom or air chamber pressure mutation, improves damping stability and reliability, simultaneously, only by setting a sleeve gas cylinder in the outside of cylinder body, does not increase too many structures additionally, makes the overall structure of damper compact, does not occupy extra space.

[0038] In some embodiments, vent hole group 11 can include a plurality of axial through holes uniformly distributed along the circumference of cylinder body 1, so that the gas flow path is symmetrical, reducing local air pressure concentration, ensuring uniform exchange of gas between the annular air chamber and the cylinder body, thereby reducing vibration noise during operation of the damper and improving the smoothness of the floating piston movement. Specifically, vent hole group 11 can be provided with six axial through holes, and the diameter d of each axial through hole is 3 mm. This design not only meets the gas exchange efficiency, but also optimizes the balance between the number and size of the openings, avoiding a decrease in structural strength due to excessively large hole diameters or an increase in air flow resistance due to excessively small hole diameters. This design takes into account the processing feasibility and air pressure adjustment accuracy, and is suitable for different air chamber pressure requirements under different working conditions. Of course, d can also be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0039] In some embodiments, the distance D between the vent hole group 11 and the bottom end of the cylinder body 1 can be set in the range of 6mm to 12mm, and the distance D can be specifically 9mm, so as to avoid the interference of the bottom end welding or sealing structure on the gas flow channel, and to ensure that the floating piston still has enough space for gas exchange when at the limit stroke, thereby preventing the failure of shock absorption caused by the out-of-control gas chamber pressure; of course, D can also be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, etc.

[0040] In some embodiments, the inner diameter of the sleeve cylinder 4 can be set to be greater than the outer diameter of the cylinder body 1, and the sleeve cylinder 4 is axially fixed with the cylinder body 1 through a positioning assembly, and the annular space formed by the difference between the inner diameter and the outer diameter maximizes the volume of the gas chamber, and the positioning assembly ensures the coaxiality of the sleeve cylinder and the cylinder body, thereby avoiding uneven distribution of the gas chamber due to assembly deviation; the axial fixing design enhances the overall structural rigidity and reduces the influence of vibration transmission on the sealing performance of the gas chamber.

[0041] In some embodiments, the positioning assembly includes an upper gasket 61 arranged at the top of the sleeve cylinder 4 and a lower gasket 62 arranged at the bottom of the sleeve cylinder 4, the upper gasket 61 is in interference fit with the sleeve cylinder 4, and the lower gasket 62 is welded and fixed with the cylinder body 1 and the sleeve cylinder 4, the interference fit of the upper gasket provides initial positioning and pre-tightening force, thereby preventing the cylinder from loosening in vibration; the welded and fixed lower gasket enhances the axial bearing capacity and ensures the sealing performance of the gas chamber; the split positioning design simplifies the assembly process and reduces production costs.

[0042] In some embodiments, a sealing assembly can be arranged at the top of the sleeve cylinder 4 and pressed by the nut cover 8, the sealing assembly includes a first sealing ring 71 and a second sealing ring 72, the first sealing ring 71 and the second sealing ring 72 are arranged in a spaced manner, the first sealing ring 71 is arranged between the cylinder body 1 and the sleeve cylinder 4, and the second sealing ring 72 is pressed by the nut cover 8 to the outer sidewall of the cylinder body 1, the sealing assembly is pressed by the nut cover to form a double sealing barrier, thereby preventing high-pressure gas leakage; the detachable structure facilitates later maintenance or adjustment of the gas chamber pressure, thereby improving the maintainability and service life of the product.

[0043] In some embodiments, the bottom of the cylinder body 1 is provided with a cylinder bottom cover 13, and a gap C is arranged between the floating piston assembly 3 and the cylinder bottom cover 13, the axial distance of the gap C is 3mm to 7mm, and specifically 5mm, so as to avoid direct contact between the floating piston and the bottom cover during the limit compression stroke, thereby preventing mechanical collision damage; the gap range is optimized and verified, which can ensure the effective volume of the gas chamber and avoid the reduction of gas exchange efficiency due to the too large gap; the axial distance of the gap C can also be 3mm, 3.5mm, 4mm, 4.5mm, 5.5mm, 6mm, 6.5mm, 7mm, etc.

[0044] In some embodiments, an anti-interference groove 41 can be arranged on the outer surface of the outer sleeve cylinder 4. By arranging the anti-interference groove, the other components of the suspension system can be provided with a space for avoiding interference, thereby reducing the risk of friction or wear caused by structural interference after installation. The groove design also enhances the heat dissipation capacity of the outer surface of the cylinder, thereby avoiding the influence of high temperature on the performance of the magnetorheological fluid.

[0045] In some embodiments, the axis of the vent hole group 11 is arranged to be inclined at an angle of 15°-45° to the axial direction of the cylinder body 1, and the edge of the hole is provided with a rounded corner. Specifically, the inclination angle is β, and β is 30°. By designing the inclination angle, the gas is guided to flow along a spiral path, thereby reducing the airflow impact noise and improving the exchange efficiency. The rounded corner structure eliminates the stress concentration of the hole, prolongs the service life of the vent hole, and reduces the interference of the machining burr on the airflow. Of course, β can also be 15°, 18°, 20°, 22°, 25°, 28°, 32°, 35°, 38°, 40°, 42°, 45°, etc.

[0046] In addition to the above preferred embodiments, the technical solutions of the utility model are not limited to the above embodiments. It should be noted that the combination of the technical solutions of any one embodiment and one or more other embodiments is within the protection scope of the utility model. Although the utility model has been described in detail above by general description and specific embodiments, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model are within the scope of the utility model.

Claims

1. A single tube magneto-rheological damper, characterized by, The application relates to a cylinder device, which comprises a cylinder body, a piston assembly and a floating piston assembly arranged in the cylinder body, and a sleeve cylinder arranged outside the cylinder body, at least one vent hole group is arranged at the bottom of the cylinder body, an annular air chamber is formed between the sleeve cylinder and the cylinder body, the vent hole group is connected with the inner cavity of the cylinder body and the annular air chamber, and the floating piston assembly realizes gas exchange between the annular air chamber and the inner cavity of the cylinder body through the vent hole group when moving axially in the cylinder body.

2. The single tube magneto-rheological damper according to claim 1, wherein, The vent hole group comprises a plurality of axial through holes which are uniformly distributed along the circumference of the cylinder body.

3. The single tube magneto-rheological damper according to claim 2, wherein, The vent hole group is provided with six vent holes, and the diameter of each vent hole is 2.5mm-3.5mm.

4. The single tube magneto-rheological damper of claim 1, wherein, The distance between the vent hole group and the bottom end of the cylinder body is 6mm-12mm.

5. The single tube magneto-rheological damper of claim 1, wherein, The inner diameter of the sleeve cylinder is larger than the outer diameter of the cylinder body, and the sleeve cylinder is axially fixed with the cylinder body through a positioning assembly.

6. The single tube magneto-rheological damper according to claim 5, wherein, The positioning assembly comprises an upper gasket arranged at the top of the sleeve cylinder and a lower gasket arranged at the bottom of the sleeve cylinder, the upper gasket is in interference fit with the sleeve cylinder, and the lower gasket is welded and fixed with the cylinder body and the sleeve cylinder.

7. The single tube magneto-rheological damper according to claim 6, wherein, The top of the sleeve cylinder is provided with a sealing assembly, and the sealing assembly is pressed and sealed by a nut cover.

8. The single tube magneto-rheological damper of claim 1, wherein, The bottom of the cylinder body is provided with a cylinder bottom cover, and a gap is arranged between the floating piston assembly and the cylinder bottom cover, the axial distance of the gap is 3mm-7mm.

9. The single tube magneto-rheological damper of claim 1, wherein, The outer surface of the sleeve cylinder is provided with an anti-interference groove.

10. The single tube magneto-rheological damper of claim 1, wherein, The axis of the vent hole group is arranged to be inclined to the axial direction of the cylinder body by 15-45 degrees, and the edge of the hole is provided with a rounded corner.

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