CN216666328U

CN216666328U - Improved magneto-rheological shock absorber

Info

Publication number: CN216666328U
Application number: CN202122567621.6U
Authority: CN
Inventors: 邹晓峰; 朱伦; 邢伟峰; 刘莉莎
Original assignee: Zhejiang Roadtamer Auto Parts Co ltd
Current assignee: Zhejiang Roadtamer Auto Parts Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-06-03
Anticipated expiration: 2031-10-25

Abstract

An improved magneto-rheological shock absorber comprises a working cylinder, a piston rod, a cover cap and an air bag, wherein the cover cap and the air bag jointly form a high-pressure gas accommodating cavity, and a magneto-rheological fluid accommodating cavity is formed among the air bag, the piston and the working cylinder; the cover is arranged in one end of the working cylinder in a sealing mode, the air bag comprises a fixing portion and an expandable portion, the fixing portion is fixed to the inner wall of the working cylinder through the cover, and the fixing portion is in sealing contact with the cover and the working cylinder. The air bag solves the problem of idle stroke, has no side effect of influencing normal use like the traditional mode, has good sealing performance, is safe and reliable, is convenient to assemble, has a simple structure, is convenient to use, and is worthy of popularization and use in the field.

Description

Improved magneto-rheological shock absorber

Technical Field

The utility model relates to the technical field of vehicle seats and suspension shock absorbers, in particular to an improved magneto-rheological shock absorber.

Background

In the magneto-rheological damper (damper), in order to compensate the "idle stroke" condition that piston rod compression and recovery stroke appear, traditional solution has (firstly) adopt floating piston, isolated magneto-rheological fluid and air chamber to play the volume when compensating the piston rod and stretching out/retracting, as the chinese utility model patent that application number is CN201220547285.7 discloses a prevent magneto-rheological fluid shock absorber that magneto-rheological fluid deposits for vehicle shock attenuation, including working cylinder and piston, be equipped with floating piston in the cavity between the lower extreme of piston and working cylinder, floating piston installs the motor that has the power under the surface, floating piston upper surface is equipped with the recess, be equipped with the helical blade who is connected with the motor rotating shaft in the recess, but this method has following shortcoming: although the problem of idle stroke is solved, the volume of the floating piston is relatively large, and the floating piston occupies a part of stroke space, so that the effective stroke of the piston rod is relatively small; secondly, a double-cylinder magnetorheological damper is adopted, for example, a double-cylinder magnetorheological damper disclosed in the Chinese utility model with the application number of CN202021352233.5, comprises a working cylinder, a working piston and a floating piston which are arranged in the working cylinder, the working cylinder is divided into a magnetorheological fluid area and a high-pressure air chamber area by the floating piston, the working piston is arranged in the magnetorheological fluid area, the working piston is provided with an electromagnetic coil and a damping hole, one end of the working piston, which is far away from the high-pressure air chamber area, is provided with a piston rod, the piston rod extends out of the working cylinder, one end of the working cylinder, which is located in the magnetorheological fluid area, is provided with a guide end cover, the piston rod penetrates through the guide end cover, the working cylinder comprises an outer cylinder and an inner cylinder, which is sleeved in the outer cylinder, the working piston and the floating piston are arranged in the inner cylinder, and the guide end cover is sequentially provided with a first sealing ring, a sliding bearing and a second sealing ring along the extension direction of the piston rod, the first sealing ring, the sliding bearing and the second sealing ring are sleeved on the piston rod, and the positioning ring and the sealing ring are arranged on the end face of the floating piston, which is in contact with the inner cylinder. Therefore, how to design a new damper structure, which minimizes the side effects while solving the "lost motion" problem, is a subject of considerable research.

Disclosure of Invention

The technical purpose of the present invention is to provide an improved magnetorheological damper which can eliminate the phenomenon of "idle stroke", and on the basis of the phenomenon, compared with the existing scheme for solving the "idle stroke" mentioned in the background art, the improved magnetorheological damper does not have other side effects which are generated in the existing scheme and affect the normal use.

The specific technical scheme of the utility model is as follows: an improved magneto-rheological shock absorber comprises a working cylinder, a piston rod, a cover cap and an air bag, wherein the cover cap is arranged in one end of the working cylinder in a sealing mode, a high-pressure gas accommodating cavity is formed between the cover cap and the air bag, and a magneto-rheological fluid accommodating cavity is formed between the air bag and the other end of the working cylinder; the airbag comprises a fixed part and an expandable and contractible part, the fixed part is fixed on the inner wall of the working cylinder by the cover cap, and the fixed part is in sealing contact with the cover cap and the working cylinder.

Preferably, the cover and the airbag are press-fitted into the cylinder, the side wall of the cover is in interference fit with the fixing portion of the airbag and the inner wall of the cylinder, and the fixing portion of the airbag is pressed against the inner wall of the cylinder by the cover.

Preferably, the side wall of the cover has a clamping portion for directly interference-fitting with the inner wall of the cylinder, and a pressing portion for pressing the fixing portion of the airbag against the inner wall of the cylinder.

Preferably, the pressing portion is provided with a pressing protrusion for fitting with an inner wall of the cylinder to press-fit on the fixing portion of the airbag.

Preferably, the fixing portion of the airbag is provided with a sealing protrusion, the sealing protrusion is pressed against the inner wall of the working cylinder to isolate two sides of the sealing protrusion, and the pressing protrusion is opposite to at least one sealing protrusion.

Preferably, the fixing portion of the air bag is provided with a sealing projection, and the sealing projection is pressed against the inner wall of the working cylinder to isolate two sides of the sealing projection.

Preferably, the sealing protrusion is provided with two rings.

Preferably, the cover cap is provided with an air port, and a detachable air nozzle is arranged in the air port.

Preferably, the bottom of the working cylinder is provided with a flanging part which is used for being pressed and attached to the bottom surface of the cover cap for packaging.

The magnetorheological damper has the technical advantages that the air bag is utilized to solve the problem of idle stroke, namely when the piston rod extends out, the air bag expands along with the piston rod to fill and compensate the volume of the working cylinder corresponding to the part of the piston rod extending out of the cylinder; when the piston rod retracts, the air bag is matched with the air bag to vacate the volume of the piston rod retracting part in the working cylinder along with the contraction; secondly, the air bag, the cover cap and the working cylinder keep good sealing performance, high-pressure gas and magnetorheological fluid cannot leak between the air bag and the cover cap or leak out of the working cylinder, and safety and reliability are realized; thirdly, the air bag is thin, occupies relatively small volume in the cylinder, has little influence on the effective stroke of the piston rod, and has no double-cylinder structure, so that the problem of the failure of the shock absorber caused by the blockage of a channel can be avoided; in addition, compared with the prior art, the utility model has the advantages of convenient assembly, simple structure, low cost and good use effect, and is worth popularizing and using in the field.

Drawings

FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a portion of an embodiment of the present invention;

the names of the parts corresponding to the numbers in the figure are respectively: 1-working cylinder, 11-flanging part, 2-piston, 3-piston rod, 4-cover, 41-clamping part, 42-pressing part, 421-pressing bulge, 5-air bag, 51-fixing part, 511-sealing bulge, 52-expandable and contractible part, 6-high-pressure gas containing cavity, 7-magnetorheological fluid containing cavity and 8-air nozzle.

Detailed Description

The utility model will be further illustrated by the following specific examples in conjunction with the drawings:

referring to fig. 1 and 2, an embodiment of an improved magnetorheological damper comprises a working cylinder 1, a piston 2, a piston rod 3, a cover 4 and an air bag 5, wherein the cover 4 is hermetically arranged inside the bottom end of the working cylinder 1, a high-pressure gas accommodating cavity 6 is formed between the cover 4 and the air bag 5, high-pressure nitrogen can be filled in the high-pressure gas accommodating cavity, a magnetorheological fluid accommodating cavity 7 is formed between the air bag 5 and the other end of the working cylinder 1, magnetorheological fluid is filled in the magnetorheological fluid accommodating cavity 7, and the piston 2 reciprocates in the magnetorheological fluid accommodating cavity 7. The cover cap 4 is provided with an air port, a detachable air nozzle 8 and a selectable one-way valve are arranged in the air port.

The side wall of the cover 4 has a clamping part 41 and a pressing part 42, the clamping part 41 is fixed with the inner wall of the working cylinder 1 by interference fit, the pressing part 42 presses a part of the side surface of the air bag 5 on the inner wall of the working cylinder 1, and the outer surface of the pressing part 42 is lower than the outer surface of the clamping part 41. The airbag 5 comprises a fixed part 51 and an expandable part 52, the fixed part 51 is pressed and fixed on the inner wall of the working cylinder 1 by the pressing part 42 of the cover 4, which is equivalent to the fact that the airbag 5 and the cover 4 are in interference fit with the inner wall of the working cylinder 1, and the fixed part 51 of the airbag 5 is in sealing contact with the cover 4 and the working cylinder 1. The interference fit fixing mode can be realized by press fitting, after the cover cap 4 and the air bag 5 are processed and molded, the cover cap 4 and the air bag 5 are assembled, then lubricating grease is coated on the outer side surface of the air bag 5, and then the cover cap 4 and the air bag 5 are pressed into the working cylinder 1 together. Before the press fitting operation, the bottom side wall of the working cylinder 1 is straight, the diameter of a bottom opening is slightly smaller than that of the cover cap 4, after the cover cap 4 and the air bag 5 are pressed in, the side wall of the bottom of the working cylinder 1 is bent to form a flanging part 11, the flanging part 11 is used for being pressed and attached to the bottom surface of the cover cap 4 for packaging, the bottom surface of the cover cap 4 cannot be completely covered by packaging, and an air nozzle 8 in the middle of the cover cap 4 can be left to be communicated with an area.

Furthermore, the pressing portion 42 is provided with a pressing protrusion 421, and the pressing protrusion 421 is used for being matched with the inner wall of the working cylinder 1 and being pressed and embedded on the fixing portion 51 of the air bag 5, so that after the pressing operation, the pressing portion 42 of the cover 4 can firmly fix the fixing portion 51 of the air bag 5, the air bag 5 cannot be separated from the cover 4 due to the pressure of the expansion of the internal gas, the sealing performance between the pressing portion 42 and the fixing portion 51 is relatively better, and the high-pressure gas is not easy to leak out.

Further, the fixing portion 51 of the air bag 5 is provided with a sealing protrusion 511, and the sealing protrusion 511 is used for being pressed to be attached to the inner wall of the working cylinder 1 to isolate two sides of the sealing protrusion, namely, the area of one side where the high-pressure gas is located and the area of one side where the magnetorheological fluid is located are sealed and isolated and cannot leak mutually. Because the sealing protrusion 511 is a part of the airbag 5 body, when the sealing protrusion is clamped by the inner wall of the working cylinder 1 and the pressing portion 42 of the cover 4, the sealing protrusion 511 will deform to a certain extent, which is equivalent to that a part of the sealing protrusion 511 is extruded to two sides of the original position, the position of the sealing protrusion 511 is basically attached to the inner wall of the working cylinder 1 together with the rest of the fixing portion 51 in a flat and tight manner, and the position of the sealing protrusion 511 ensures good sealing and fastening effects. In this embodiment, the sealing protrusion 511 has two turns, so that the sealing and fastening effects are better, and further, the pressing protrusion 421 has one turn and is opposite to the left sealing protrusion 511, so that a larger force is generated between the two, and the sealing and fastening effects are improved again.

The working principle of the scheme is as follows: when the piston 2 extends out along with the piston rod 3 (a recovery stroke), the high-pressure nitrogen gradually expands, the air bag 5 gradually expands, when the piston 2 is pushed to the right end oil seal structure in the working cylinder 1, part of the piston rod 3 extends out of the working cylinder 1, and the air bag 5 finally compensates the volume of the piston rod 3 which is lost in the working cylinder 1 and extends out of the outer part of the cylinder; when the piston 2 retracts along with the piston rod 3, the air bag 5 is extruded and shrunk finally, the high-pressure nitrogen is compressed, and the volume reduced by the air bag 5 or the high-pressure nitrogen, namely the volume of the piston rod 3 extending into the working cylinder 1 again, so that the problem of idle stroke is solved through the air bag 5. In addition, because the air bag 5 is used in the scheme to solve the problem of idle stroke, the working cylinder 1 is also a conventional single cylinder, and therefore, the problems that the effective stroke of the piston rod is insufficient (it can also be understood that if the effective stroke of the piston rod is relatively normal, the whole length of the working cylinder 1 needs to be longer) and the sediment of the magnetorheological fluid hydroxyl iron powder can block a double-cylinder structure channel to cause the shock absorber to fail and the like do not exist in the conventional mode mentioned in the background art. Get back to this technical scheme, the mode that shroud 4 and gasbag 5 pressed into working cylinder 1 jointly is comparatively convenient, overall structure is simple, high durability and convenient use, good sealed effect can be played in sealed protruding 511's existence, prevent revealing of high-pressure gas and magnetorheological suspensions, when compressing tightly protruding 421 existence and improving the fastening effect to gasbag 5, also improve its and gasbag 5 and the sealed effect between the working cylinder 1, shroud 4 itself also because high-pressure nitrogen gas and with the lateral wall of working cylinder 1 and turn over part 11 tightly, it is also better with the sealed effect of working cylinder 1, it is comprehensive to see, this scheme is worth using widely in this field.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are given by way of example only and are not limiting of the utility model. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles.

Claims

1. An improved magneto-rheological damper, which comprises a working cylinder (1), a piston (2) and a piston rod (3), and is characterized in that: the magnetorheological fluid generator is characterized by further comprising a cover cap (4) and an air bag (5), wherein the cover cap (4) is arranged inside one end of the working cylinder (1) in a sealing mode, a high-pressure gas accommodating cavity (6) is formed between the cover cap (4) and the air bag (5), and a magnetorheological fluid accommodating cavity (7) is formed between the air bag (5) and the other end of the working cylinder (1); the airbag (5) comprises a fixed part (51) and an expandable and contractible part (52), the fixed part (51) is fixed on the inner wall of the working cylinder (1) by the cover cap (4), and the fixed part (51) is in sealing contact with both the cover cap (4) and the working cylinder (1).

2. An improved magnetorheological damper as in claim 1 wherein: the cover cap (4) and the air bag (5) are pressed into the working cylinder (1), the side wall of the cover cap (4) is connected with the fixing part (51) of the air bag (5) and the inner wall of the working cylinder (1) in interference fit, and the fixing part (51) of the air bag (5) is pressed on the inner wall of the working cylinder (1) by the cover cap (4).

3. An improved magnetorheological damper, in accordance with claim 2, wherein: the side wall of the cover cap (4) is provided with a clamping part (41) and a pressing part (42), the clamping part (41) is used for being in interference fit with the inner wall of the working cylinder (1) directly, and the pressing part (42) is used for pressing the fixing part (51) of the air bag (5) on the inner wall of the working cylinder (1).

4. An improved magnetorheological damper as in claim 3 wherein: the pressing part (42) is provided with a pressing bulge (421), and the pressing bulge (421) is matched with the inner wall of the working cylinder (1) and is pressed on the fixing part (51) of the air bag (5).

5. An improved magnetorheological damper, in accordance with claim 4, wherein: the fixing part (51) of the air bag (5) is provided with a sealing bulge (511), the sealing bulge (511) is used for being pressed against the inner wall of the working cylinder (1) to isolate two sides of the sealing bulge, and the pressing bulge (421) is opposite to at least one sealing bulge (511).

6. An improved magnetorheological damper as in claim 1 wherein: the fixing part (51) of the air bag (5) is provided with a sealing bulge (511), and the sealing bulge (511) is pressed against the inner wall of the working cylinder (1).

7. An improved magnetorheological damper as in claim 5 or 6 wherein: the sealing bulge (511) is provided with two circles.

8. An improved magnetorheological damper as in claim 1 wherein: the cover cap (4) is provided with an air port, and a detachable air nozzle (8) is arranged in the air port.

9. An improved magnetorheological damper as in claim 1 wherein: the bottom of the working cylinder (1) is provided with a flanging part (11), and the flanging part (11) is used for being pressed and attached to the bottom surface of the cover cap (4) to be packaged.