Asymmetric damping magnetorheological damper piston

Abstract

The utility model discloses an asymmetric damping magneto-rheological shock absorber piston which comprises a piston rod, a first end cover, a sleeve, an electromagnet, a plug and a second end cover. The first end cover and the second end cover are provided with a plurality of through holes; the electromagnet is provided with a through hole and a counter bore; the first end cover and the second end cover are connected with the two ends of the sleeve respectively, a containing cavity is formed in the sleeve, and the electromagnet is arranged in the containing cavity and connected with the first end cover and the second end cover. The side cylindrical surface of the electromagnet and the inner wall of the sleeve form an annular gap which is communicated with the through holes of the first end cover and the second end cover. The through hole of the electromagnet is communicated with the through holes of the first end cover and the second end cover; the piston rod penetrates through the through hole of the first end cover, is inserted into the counter bore of the electromagnet and is connected with the electromagnet. And the plug is arranged in the through hole of the second end cover. And the plug is impacted by the magnetorheological fluid to close and open the through hole of the second end cover, so that the asymmetric characteristic of the damping force of the magnetorheological damper is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, and particularly relates to an asymmetric damping magnetorheological shock absorber piston. Background Technique

[0002] Magnetorheological shock absorbers are used in vehicle suspensions and other occasions. Currently, the pistons of mass-produced vehicle suspension magnetorheological shock absorbers are designed based on the symmetry of compression damping force and recovery damping force, which does not meet the characteristics of the majority of vehicle suspensions that require shock absorbers to have asymmetric damping forces. Content of the Utility Model

[0003] The purpose of the utility model is to provide an asymmetric damping magnetorheological shock absorber piston aiming at the defects and deficiencies of the prior art.

[0004] To achieve the above purpose, the technical scheme adopted by the utility model is: an asymmetric damping magnetorheological shock absorber piston, including a piston rod, a first end cover, a sleeve, an electromagnet, a plug and a second end cover. The innovation lies in that: a central through hole is respectively opened on the first end cover, a first through hole and a second through hole are opened at the edge, and the first through hole is located between the central through hole and the second through hole; a counterbore is opened at the center of the electromagnet, and a third through hole is opened at the edge; a fourth through hole with a large upper part and a small lower part is opened on the second end cover, and a fifth through hole is opened at the edge; the plug is located in the fourth through hole; the electromagnet is placed in the sleeve, and an annular gap is formed between the outer cylindrical surface of the electromagnet and the inner wall of the sleeve. The first end cover is arranged at the top of the sleeve, and the second end cover is arranged at the bottom of the sleeve. After the electromagnet, the sleeve, the first end cover and the second end cover are combined and installed, the central through hole is communicated with the counterbore, and the piston rod passes through the central through hole, inserts into the counterbore, and is connected with the electromagnet. The first through hole, the third through hole and the fourth through hole are communicated, and the second through hole, the annular gap and the fifth through hole are communicated.

[0005] Further, the plug is of a spherical structure, and the size of the plug is larger than the minimum opening size of the fourth through hole and smaller than the maximum opening size of the fourth through hole.

[0006] After adopting the above structure, the beneficial effect of the utility model is:

[0007] By setting the plug, and the plug is impacted by the magnetorheological fluid to realize the closing and opening of the through hole of the second end cover, thereby realizing the asymmetric characteristic of the damping force of the magnetorheological shock absorber, so as to meet the requirements of the vehicle suspension for the shock absorber. Description of the Drawings

[0008] Figure 1 It is a structural schematic diagram of the utility model;

[0009] Figure 2 It is one of the explosion schematic diagrams of the utility model;

[0010] Figure 3 This is the second explosion schematic diagram of the present utility model;

[0011] Figure 4 This is the cross-sectional view of the present utility model.

[0012] Explanation of reference numerals:

[0013] 1 piston rod, 2 first end cover, 21 central through hole, 22 first through hole, 23 second through hole, 3 sleeve, 4 electromagnet, 41 counterbore, 42 third through hole, 5 plug, 6 second end cover, 61 fourth through hole, 62 fifth through hole, 7 annular gap. Specific embodiments

[0014] The present utility model will be further described below with reference to the accompanying drawings.

[0015] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0016] Refer to Figures 1-4 , an asymmetric damping magnetorheological shock absorber piston, including a piston rod 1, a first end cover 2, a sleeve 3, an electromagnet 4, a plug 5 and a second end cover 6. A central through hole 21 is respectively opened on the first end cover 2, a first through hole 22 and a second through hole 23 are opened at the edge, and the first through hole 22 is located between the central through hole 21 and the second through hole 23; a counterbore 41 is opened in the center of the electromagnet 4, and a third through hole 42 is opened at the edge; a fourth through hole 61 that is larger at the top and smaller at the bottom is opened on the second end cover 6, and a fifth through hole 62 is opened at the edge; the plug 5 is located in the fourth through hole 61; the electromagnet 4 is placed in the sleeve 3, and an annular gap 7 is formed between the outer cylindrical surface of the electromagnet 4 and the inner wall of the sleeve. The first end cover 2 is arranged at the top of the sleeve 3, and the second end cover 6 is arranged at the bottom of the sleeve 3. After the electromagnet 4, the sleeve 3, the first end cover 2 and the second end cover 6 are assembled and installed, the central through hole 21 is communicated with the counterbore 41, and the piston rod 1 passes through the central through hole 21 and is inserted into the counterbore 41 and is connected to the electromagnet 4. The first through hole 21, the third through hole 42 and the fourth through hole 61 are communicated, and the second through hole 23, the annular gap 7 and the fifth through hole 62 are communicated.

[0017] Specifically, the first end cap 2 and the second end cap 6 are respectively connected to the openings at both ends of the sleeve 3 to form an accommodation cavity inside the sleeve 3; the electromagnet 4 is arranged in the accommodation cavity; one end of the electromagnet 4 with a counterbore 41 is connected to the first end cap 2, and the other end of the electromagnet 4 is connected to the second end cap 6. The counterbore 41 of the electromagnet 4 communicates with the central through hole 21 of the first end cap 2. One end opening of the third through hole 42 of the electromagnet 4 communicates with the first through hole 22 of the first end cap 2, and the other end opening of the third through hole 42 of the electromagnet 4 communicates with one end of the larger opening of the fourth through hole 61 of the second end cap 6; the piston rod 1 passes through the central through hole 21 of the through hole of the first end cap 2 and then inserts into the counterbore 41 of the electromagnet 4 to be connected to the electromagnet 4; the outer cylindrical surface of the electromagnet 4 and the inner wall of the sleeve 3 form an annular gap 7, and the two end openings of the annular gap 7 communicate with the second through hole 23 of the first end cap 2 and the fifth through hole 62 of the second end cap 6 respectively.

[0018] In this embodiment, the plug 5 has a spherical structure, and the size of the plug is larger than the minimum opening size of the fourth through hole 61 and smaller than the maximum opening size of the fourth through hole 61. The plug 5 is restricted to move within the fourth through hole 61.

[0019] The working principle of the present utility model:

[0020] When the piston moves axially towards the piston rod 1, the magnetorheological fluid flows into the piston from the first through hole 22 and the second through hole 23 of the first end cap 2. Among them, the magnetorheological fluid flowing in from the second through hole 23 of the first end cap 2 passes through the annular gap 7 between the electromagnet 4 and the sleeve 3 and then flows out from the fifth through hole 62 of the second end cap 6; at the same time, the magnetorheological fluid flowing in from the first through hole 22 of the through hole of the first end cap 2 flows through the third through hole 42 of the electromagnet 4 and then impacts the plug 5, thereby blocking the fourth through hole 61 of the second end cap 6. At this time, the damping force generated by the magnetorheological fluid flowing through the piston is relatively large.

[0021] When the piston moves axially towards the second end cap 6, the magnetorheological fluid flows into the piston from the fourth through hole 61 and the fifth through hole 62 of the second end cap 6. Among them, the magnetorheological fluid flowing in from the fifth through hole 62 of the second end cap 6 passes through the annular gap 7 between the electromagnet 4 and the sleeve 3 and then flows out from the second through hole 23 of the first end cap 2; at the same time, the magnetorheological fluid flowing in from the fourth through hole 61 of the second end cap 6 impacts the plug 5, thereby opening the fourth through hole 61 of the second end cap 6, then passing through the third through hole 42 of the electromagnet 4, and finally flowing out from the first through hole 22 of the first end cap 2. At this time, the damping force generated by the magnetorheological fluid flowing through the piston is relatively small.

[0022] In summary, the present utility model realizes the asymmetric damping force characteristic of the magnetorheological shock absorber.

[0023] The above is only used to illustrate the technical solution of the present utility model rather than to limit it. Any other modifications or equivalent substitutions made by those of ordinary skill in the art to the technical solution of the present utility model shall be covered within the scope of the claims of the present utility model as long as they do not depart from the spirit and scope of the technical solution of the present utility model.

Claims

1. An asymmetric damping magnetorheological shock absorber piston, comprising a piston rod, a first end cover, a sleeve, an electromagnet, a plug and a second end cover, characterized in that: A central through hole, a first through hole and a second through hole are respectively provided on the first end cover, and the first through hole is located between the central through hole and the second through hole; a countersunk hole is provided at the center of the electromagnet, and a third through hole is provided at the edge; a fourth through hole which is larger at the top and smaller at the bottom is provided on the second end cover, and a fifth through hole is provided at the edge; the plug is located in the fourth through hole; the electromagnet is placed in the sleeve, and the outer cylindrical surface of the electromagnet and the inner wall of the sleeve form an annular gap, the first end cover is arranged at the top of the sleeve, and the second end cover is arranged at the bottom of the sleeve, when the electromagnet, the sleeve, the first end cover and the second end cover are assembled and installed, the central through hole is connected with the countersunk hole, and the piston rod passes through the central through hole, is inserted into the countersunk hole, and is connected with the electromagnet, the first through hole, the third through hole and the fourth through hole are connected, and the second through hole, the annular gap and the fifth through hole are connected.

2. The asymmetric damping magnetorheological shock absorber piston according to claim 1, characterized in that: The plug is a spherical structure, and the size of the plug is larger than the minimum opening size of the fourth through hole, and smaller than the maximum opening size of the fourth through hole.

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