CN219932816U - Automobile shock absorber - Google Patents
Automobile shock absorber Download PDFInfo
- Publication number
- CN219932816U CN219932816U CN202320402155.2U CN202320402155U CN219932816U CN 219932816 U CN219932816 U CN 219932816U CN 202320402155 U CN202320402155 U CN 202320402155U CN 219932816 U CN219932816 U CN 219932816U
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- Prior art keywords
- guide
- piston rod
- cylinder
- shock absorber
- hole
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- 230000035939 shock Effects 0.000 title claims abstract description 54
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 53
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000013016 damping Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The present utility model provides an automobile shock absorber, comprising: a cylinder body (10) filled with a working fluid, a piston rod (20) inserted into the cylinder body (10), one end of the piston rod being positioned inside the cylinder body (10), the other end of the piston rod being positioned outside the cylinder body (10), a piston valve (30) being mounted on one end of the piston rod (20), a rod guide (40) being fitted into an opening (110) of the cylinder body (10), a guide through hole (410) through which the piston rod (20) is inserted being formed in the rod guide (40), a damper spring (50) being fitted into a lower end (411) of the guide through hole (410) on the side of the piston valve (30) by interference fit, and being protruded from the guide through hole (410) in a state of natural extension; the piston rod (20) includes an expanded diameter portion (210), and the expanded diameter portion (210) abuts against a free end (510) of the damper spring (50) during the extension of the piston rod (20) from the cylinder (10) to limit the movement range of the piston rod (20).
Description
Technical Field
The utility model relates to an automobile shock absorber.
Background
Currently, conventional vehicles use various suspensions to improve the operability or riding comfort. In particular, a suspension (shock absorber) incorporating a spring is used between the wheel and the vehicle body in order to absorb vibration or impact force.
In general, a shock absorber includes a cylinder filled with a working fluid, a cap member covering one end of the cylinder, a piston fitted into the cylinder via the cap member, a piston rod fitted over the piston, a dust cover fitted over the outside of the cap member, and the like. The interior of the cylinder of the shock absorber is divided into an upper chamber and a lower chamber by a piston having a flow valve and a extension valve. A reserve tube is formed at the lower end of the cylinder body, and is connected with the lower chamber via a partition plate having a compression valve and a compensation valve.
The shock absorber achieves a shock absorbing effect in the following manner.
When the piston rod of the shock absorber is compressed, the piston descends, the volume of the upper cavity is increased, the volume of the lower cavity is reduced, the circulation valve is opened, and oil in the lower cavity enters the upper cavity through the circulation valve; and simultaneously, a part of oil liquid of the compression valve is opened to enter the oil storage cylinder. The throttling action of the two valves on the oil liquid causes the shock absorber to generate damping action when in compression motion.
In addition, when the piston rod of the shock absorber is stretched, the piston moves upwards, the volume of the upper cavity is reduced, the volume of the lower cavity is increased, the stretching valve is opened, and oil in the upper cavity enters the lower cavity through the stretching valve; and simultaneously, the compensation valve is opened, and a part of oil enters the lower cavity from the oil storage cylinder. The throttling action of the two valves on the oil liquid causes the shock absorber to generate damping action during the stretching movement.
In such a shock absorber, as shown in fig. 1, the cylinder portion 1 includes a rebound stopper 3 which limits the range of movement of the piston rod 2. Specifically, the rebound stopper 3 is constituted by a rebound base 31 and rebound rubber 32. Wherein the rebound mount 31 is a cylindrical member, a groove is formed on the piston rod 2, and the rebound mount 31 is fixed to the outer circumference of the piston rod 2 by caulking via a stopper ring fitted into the groove. The rebound rubber 32 is also a cylindrical member, and moves together with the piston rod 2 in the cylinder 1 in which oil is sealed. The rebound rubber 32 is arranged between the lever guide 4 and the rebound base 31 in the center line direction. The rebound rubber 32 is provided in contact with the rebound base 31. During the extension stroke of the suspension, the rebound stopper 3 limits the movement of the piston rod 2 toward the upper side in the axial direction to a prescribed range.
With the rebound stopper 3 thus mounted, since the rebound stopper 3 frequently collides with the lever guide 4, the rebound base 31 is easily deformed and falls off, rotation and noise are easily generated in the cylinder portion 1 filled with oil, and the assembly process of such a structure is complicated and the manufacturing cost is high.
Disclosure of Invention
The present utility model has been made in view of the above-described problems, and an object of the present utility model is to provide an automobile shock absorber having a rebound stopper structure which is simple in structure, easy to install, and not easy to fall off.
In order to achieve the above object, the present utility model provides an automobile shock absorber, comprising: a cylinder filled with a working fluid, a piston rod inserted into the cylinder, one end of the piston rod being located inside the cylinder, the other end of the piston rod being located outside the cylinder, a piston valve being mounted at one end of the piston rod, a rod guide being fitted into an opening of the cylinder, a guide through hole through which the piston rod is inserted being formed in the rod guide, a damper spring being fitted into a lower end of the piston valve side of the guide through hole by interference fit and protruding from the guide through hole in a naturally elongated state; the piston rod comprises an expanding part, and the expanding part is abutted with the free end of the damping spring in the process that the piston rod extends out of the cylinder body so as to limit the moving range of the piston rod.
The automobile shock absorber according to the present utility model has: a cylinder filled with a working fluid, a piston rod inserted into the cylinder, one end of the piston rod being located inside the cylinder, the other end of the piston rod being located outside the cylinder, a piston valve being mounted at one end of the piston rod, a rod guide being fitted into an opening of the cylinder, a guide through hole through which the piston rod is inserted being formed in the rod guide, a damper spring being fitted into a lower end of the piston valve side of the guide through hole by interference fit and protruding from the guide through hole in a naturally elongated state; the piston rod comprises an expanding part, and the expanding part is abutted with the free end of the damping spring in the process that the piston rod extends out of the cylinder body so as to limit the moving range of the piston rod. The damping spring is in contact with the enlarged diameter portion formed on the piston rod, so that the piston rod can be limited in movement range, and the piston valve can be prevented from being damaged by collision with the rod guide. In addition, the expanded diameter part of the piston rod is formed by machining of a machine tool, and the damping spring is embedded at the lower end of the guide through hole through interference fit, so that the manufacture and the installation are simple. The damping spring is embedded at the lower end of the guide through hole through interference fit, and is difficult to loosen and fall off easily even if repeatedly stressed during the extension stroke of the suspension, so that the rotation and noise caused by the falling off can be effectively prevented.
In the automobile shock absorber according to the present utility model, the inner peripheral surface of the lower end of the guide through hole includes an insertion portion that is interference-fitted with the damper spring and a stepped portion that is clearance-fitted with the damper spring.
In the automobile damper according to the present utility model, the stepped portion includes a first stepped portion connected to the fitted portion and formed as a tapered surface having a larger diameter toward the lower end of the guide through hole, and a second stepped portion connected to the first stepped portion via a stepped surface and formed as a cylindrical surface, and the second stepped portion has an inner diameter larger than that of the enlarged diameter portion.
In the automobile shock absorber according to the present utility model, when the expanded diameter portion abuts against the free end portion of the damper spring and the damper spring is compressed to the maximum extent, the expanded diameter portion does not contact the stepped surface.
In the automobile shock absorber according to the present utility model, a bush is provided between the piston rod and the guide through hole of the rod guide, and the lower end of the bush on the piston valve side abuts against the fitted end of the damper spring fitted into the guide through hole.
In the automobile shock absorber according to the present utility model, the flange protruding toward the center of the guide through hole is formed at the upper end of the guide through hole on the protruding side of the piston rod, and the flange abuts against the upper end of the bush on the protruding side of the piston rod.
In addition, the shock absorber for an automobile according to the present utility model further includes a seal for sealing the working fluid in the cylinder, and the seal is disposed on the protruding side of the piston rod of the rod guide.
In addition, in the automobile shock absorber of the present utility model, a cap member that covers the open end of the cylinder is further provided.
In addition, in the automobile shock absorber of the present utility model, the cylinder block includes the cylinder main body and the damping housing.
In summary, the automobile shock absorber according to the present utility model has: a cylinder filled with a working fluid, a piston rod inserted into the cylinder, one end of the piston rod being located inside the cylinder, the other end of the piston rod being located outside the cylinder, a piston valve being mounted at one end of the piston rod, a rod guide being fitted into an opening of the cylinder, a guide through hole through which the piston rod is inserted being formed in the rod guide, a damper spring being fitted into a lower end of the piston valve side of the guide through hole by interference fit and protruding from the guide through hole in a naturally elongated state; the piston rod comprises an expanding part, and the expanding part is abutted with the free end of the damping spring in the process that the piston rod extends out of the cylinder body so as to limit the moving range of the piston rod. The damping spring is in contact with the enlarged diameter portion formed on the piston rod, so that the piston rod can be limited in movement range, and the piston valve can be prevented from being damaged by collision with the rod guide. In addition, the expanded diameter part of the piston rod is formed by machining of a machine tool, and the damping spring is embedded at the lower end of the guide through hole through interference fit, so that the manufacture and the installation are simple. The damping spring is embedded at the lower end of the guide through hole through interference fit, and is difficult to loosen and fall off easily even if repeatedly stressed during the extension stroke of the suspension, so that the rotation and noise caused by the falling off can be effectively prevented.
Drawings
Fig. 1 is a schematic view of a conventional automobile shock absorber.
Fig. 2 is a schematic sectional view showing a state in which a damping spring of an automobile shock absorber of the present utility model is compressed.
Fig. 3 is a schematic sectional view showing a state in which a damper spring of an automobile shock absorber of the present utility model is not compressed.
Fig. 4 is an enlarged partial cross-sectional schematic view of the shock absorber for a vehicle of the present utility model.
Fig. 5 is an enlarged partial cross-sectional schematic view of the structure in the vicinity of the rod guide of the automobile shock absorber of the present utility model.
Fig. 6 is an enlarged partial sectional view of the damping spring of the automobile shock absorber of the present utility model when not compressed.
Detailed Description
Hereinafter, embodiments of the present utility model will be described with reference to the drawings. However, the cap member for an automobile shock absorber and the automobile shock absorber disclosed in the following embodiments are merely examples, and are not limited to the following embodiments as long as the effects of the present utility model can be achieved.
Fig. 2 is a schematic sectional view showing a state in which a damping spring of an automobile shock absorber of the present utility model is compressed. Fig. 3 is a schematic sectional view showing a state in which a damper spring of an automobile shock absorber of the present utility model is not compressed. Fig. 4 is an enlarged partial cross-sectional schematic view of the shock absorber for a vehicle of the present utility model. Fig. 5 is an enlarged partial cross-sectional schematic view of the structure in the vicinity of the rod guide of the automobile shock absorber of the present utility model.
Fig. 6 is an enlarged partial sectional view of the damping spring of the automobile shock absorber of the present utility model when not compressed.
As shown in fig. 2 and 3, the automobile damper according to the present embodiment includes: a cylinder 10 filled with a working fluid; a piston rod 20 inserted into the cylinder 10, one end of which is located inside the cylinder 10 and the other end of which is located outside the cylinder 10; a piston valve 30 mounted at one end of the piston rod 20; a rod guide 40 fitted into the opening 110 of the cylinder 10, and a guide through hole 410 through which the piston rod 20 is inserted is formed in the rod guide 40; the damper spring 50 is fitted into the lower end 411 of the pilot through hole 410 on the piston valve 30 side by interference fit, and protrudes from the pilot through hole 410 in a naturally extended state (see fig. 6).
Wherein the piston rod 20 includes an expanded diameter portion 210, and the expanded diameter portion 210 abuts against the free end 510 of the damping spring 50 to limit the movement range of the piston rod 20 during the process of the piston rod 20 being extended from the cylinder 10. The enlarged diameter portion 210 may be formed in various manners, may be formed as an enlarged diameter portion having a circular through surface, may be formed as an enlarged diameter portion having a tapered surface, and may have other shapes as long as the enlarged diameter portion 210 can be brought into contact with the free end 510 of the damper spring 50.
Specifically, the cylinder block 10 is constructed in a so-called double pipe structure including a cylinder body 11 and a damping housing 12. Of course, the cylinder block 10 may be formed in a so-called triple pipe structure including the cylinder body 11, the outer pipe body, and the damper housing 12, or other well-known cylinder block structure for an automobile shock absorber.
As shown in fig. 2, a bottom valve V is mounted at the lower end of the cylinder 10, and a bottom cover UC is covered outside the bottom valve V. A piston rod 20 is inserted into the main cylinder 11, a first end (one end) of the piston rod 20 is positioned inside the cylinder 10, a second end (the other end) is positioned outside the cylinder 10, a piston valve 30 is mounted to the first end of the piston rod 20, and the second end of the piston rod 20 is connected to a vehicle body. Specifically, the first end of the piston rod 20 is formed as a small diameter portion, an external thread is formed at an end of the small diameter portion so as to pass through the mounting through hole 310 on the axis of the piston valve 30, and then a nut is screwed on the small diameter portion to mount the piston valve 30 on the first end of the piston rod 20.
As shown in fig. 2 to 4, a rod guide 40 is fitted into the upper end of the cylinder 10, a guide through hole 410 is formed in the rod guide 40, and one end of the damper spring 50 is attached to the lower end of the guide through hole 410 by interference fit and protrudes from the guide through hole 410 in a naturally elongated state (fig. 3). An expanded diameter portion 210 is formed at a predetermined position of the piston rod 20, and the piston rod 20 passes through the guide through hole 410 and the coil spring as the damper spring 50 and protrudes to the outside of the cylinder 10. The diameter-enlarged portion 210 is formed at a predetermined position of the piston rod 20, and the shock absorber of different types may be designed according to the specifications of the shock absorber, with different restrictions on the distance of movement of the piston rod 20 toward the upper side in the axial direction.
During the extension stroke of the suspension, the piston rod 20 is extended outwardly, i.e., moved upwardly, and eventually, the enlarged diameter portion 210 of the piston rod 20 is brought into contact with the free end of the damper spring 50, compressing the damper spring 50, and buffering the extension of the piston rod 20 by the damper spring 50, limiting the transition of the extension of the piston rod 20 outwardly, and avoiding the collision of the piston valve 30 with the rod guide 40.
According to the automobile shock absorber of the present utility model, the damping spring is in contact with the enlarged diameter portion formed on the piston rod, so that the piston rod is restricted from moving, and the piston valve is prevented from being damaged by collision with the rod guide. In addition, the expanded diameter part of the piston rod is formed by machining of a machine tool, the damping spring is embedded at the lower end of the guide through hole through interference fit, and compared with the prior structure that a rebound base and rebound rubber are arranged on the piston rod, the structure is simple to manufacture and install. The damping spring is embedded at the lower end of the guide through hole through interference fit, and is difficult to loosen and fall off easily even if repeatedly stressed during the extension stroke of the suspension, so that the rotation and noise caused by the falling off can be effectively prevented.
As shown in fig. 5, an embedded portion 420 that is interference-fitted with the damper spring 50 and a stepped portion 430 that is clearance-fitted with the damper spring 50 are provided on the inner peripheral surface of the lower end 411 of the guide through hole 410. This reduces the contact area of the rod guide 40 with the damper spring 50, reducing interference of the rod guide 40 with the expansion and contraction of the damper spring 50.
In addition, as shown in fig. 5, the stepped portion 430 may include a first stepped portion 431 and a second stepped portion 432. The first step 431 is connected to the fitting portion 420, and is formed as a tapered surface having a diameter that increases toward the lower end 411 of the guide through hole 410. The second stepped portion 432 is connected to the first stepped portion 431 via a stepped surface 433, the second stepped portion 432 is formed as a cylindrical surface, and the inner diameter of the second stepped portion 432 is larger than the diameter of the expanded diameter portion 210. Of course, the first step 431 may be formed in a cylindrical shape without forming a tapered surface, as long as it can be formed by clearance fit. The second stepped portion 432 may be formed not as a cylindrical surface but as a tapered surface, as long as the minimum inner diameter thereof is larger than the maximum diameter of the enlarged diameter portion.
In this way, by forming the first stepped portion 431, the contact area of the lever guide 40 and the damper spring 50 can be reduced, and interference of the lever guide 40 to expansion and contraction of the damper spring 50 can be reduced. Further, by forming the second stepped portion 432, it is possible to avoid the collision between the expanded diameter portion 210 and the rod guide 40 when the expanded diameter portion 210 compresses the damper spring 50, and to avoid damage to the rod guide 40 and the piston rod 20. Of course, the stepped portion 430 may be formed of only one stepped portion, and the second stepped portion 432 may not be formed in the case where the damper spring 50 is sufficiently long.
As shown in fig. 2 and 5, when the diameter-enlarged portion 210 abuts against the free end portion of the damper spring 50 and the damper spring 50 is compressed to the maximum extent, the diameter-enlarged portion 210 does not abut against the stepped surface 433. That is, the depth of the first stepped portion 431 in the axial direction of the piston rod 20 is formed to be shorter than the length when the damper spring 50 is compressed to the maximum extent, so that the collision of the expanded diameter portion 210 with the rod guide 40 when the damper spring 50 is compressed by the expanded diameter portion 210 is further avoided, and damage to the rod guide 40 and the piston rod 20 is avoided.
As shown in fig. 5, a bush 60 is provided between the piston rod 20 and the guide through hole 410 of the rod guide 40, and a lower end 610 of the bush 60 on the piston valve 30 side abuts against an insertion end 520 of the damper spring 50 inserted into the guide through hole 410.
Through the abutting of the bushing 60 and the damping spring 50 and the interference fit of the damping spring 50 and the rod guide 40, the damping spring 50 can be more stably fixed on the rod guide 40, the damping spring 50 is further prevented from moving or falling off, and the service life of the shock absorber is prolonged.
As shown in fig. 5, a flange 412 protruding toward the center of the guide through hole 410 may be formed at the upper end of the guide through hole 410 on the protruding side of the piston rod 20, and the flange 412 may be in contact with the upper end 620 of the bush 60 on the protruding side of the piston rod 20.
The bushing 60 can be stably fixed by the abutting arrangement of the bushing 60 and the flange 412. The bush 60 is stopped by providing the flange 412 on the upper side in the direction (upper side) in which the force of the piston rod 20 applied to the damper spring 50 extends out of the piston rod 20, and the bush 60 can be stably fixed, and the bush 60 is prevented from being loosened by the force of the damper spring 50.
In addition, as shown in fig. 5, the automobile shock absorber further has a seal 70 for sealing the working fluid in the cylinder 10, the seal 70 being disposed on the protruding side of the piston rod 20 of the rod guide 40. Also, the automobile shock absorber further has a cap member 80 covering the open end of the cylinder 10. The leakage of the working fluid from the cylinder 10 can be prevented by the seal 70, and the entry of dust into the cylinder 10 can be prevented by the cap member 80
Finally, it should be noted that: the above embodiments are merely specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications and variations of the embodiments described herein will be apparent to those skilled in the art, and equivalents may be substituted for elements thereof without departing from the scope of the utility model. Such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (9)
1. A shock absorber for an automobile is characterized in that,
the device comprises:
a cylinder (10) filled with a working fluid,
a piston rod (20) inserted into the cylinder (10), one end of which is located inside the cylinder (10) and the other end of which is located outside the cylinder (10),
a piston valve (30) mounted to the one end of the piston rod (20),
a rod guide (40) fitted into the opening (110) of the cylinder (10), wherein a guide through hole (410) through which the piston rod (20) is inserted is formed in the rod guide (40),
a damper spring (50) which is fitted into the lower end (411) of the guide through hole (410) on the piston valve (30) side by interference fit, and which protrudes from the guide through hole (410) in a state of natural extension;
the piston rod (20) comprises an expanded diameter portion (210), and the expanded diameter portion (210) is abutted with the free end (510) of the damping spring (50) in the process of extending the piston rod (20) from the cylinder body (10) so as to limit the movement range of the piston rod (20).
2. The automobile shock absorber according to claim 1, wherein,
an inner peripheral surface of the lower end (411) of the guide through hole (410) includes an insertion portion (420) that is interference-fitted with the damper spring (50), and a stepped portion (430) that is clearance-fitted with the damper spring (50).
3. The automobile shock absorber according to claim 2, wherein,
the step (430) includes a first step (431) and a second step (432),
the first step part (431) is connected with the embedded part (420) and is formed into a conical surface with larger diameter towards the lower end (411) of the guide through hole (410),
the second stepped portion (432) is connected with the first stepped portion (431) via a stepped surface (433), the second stepped portion (432) is formed as a cylindrical surface, and the inner diameter of the second stepped portion (432) is larger than the diameter of the expanded diameter portion (210).
4. The automobile shock absorber according to claim 3, wherein,
when the diameter-expanding portion (210) is abutted against the free end portion of the damper spring (50) and the damper spring (50) is compressed to the maximum extent, the diameter-expanding portion (210) does not contact the step surface (433).
5. The automobile shock absorber according to any of claims 1 to 4, wherein,
a bushing (60) is provided between the piston rod (20) and the guide through hole (410) of the rod guide (40),
a lower end (610) of the bushing (60) on the piston valve (30) side is in contact with an insertion end (520) of the damper spring (50) that is inserted into the guide through hole (410).
6. The automobile shock absorber according to claim 5, wherein,
a flange (412) protruding toward the center of the guide through hole (410) is formed at the upper end of the guide through hole (410) on the protruding side of the piston rod (20),
the flange (412) is in contact with an upper end (620) of the bush (60) on the protruding side of the piston rod (20).
7. The automobile shock absorber according to claim 6, wherein,
there is also a seal (70) for sealing the working fluid in the cylinder (10), the seal (70) being arranged on the protruding side of the piston rod (20) of the rod guide (40).
8. The automobile shock absorber according to claim 7, further having a cap member (80) covering an open end of the cylinder (10).
9. The vehicle shock absorber according to any of claims 1-4, wherein the cylinder block (10) comprises a cylinder body (11) and a damping shell (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320402155.2U CN219932816U (en) | 2023-02-27 | 2023-02-27 | Automobile shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320402155.2U CN219932816U (en) | 2023-02-27 | 2023-02-27 | Automobile shock absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219932816U true CN219932816U (en) | 2023-10-31 |
Family
ID=88504025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320402155.2U Active CN219932816U (en) | 2023-02-27 | 2023-02-27 | Automobile shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219932816U (en) |
-
2023
- 2023-02-27 CN CN202320402155.2U patent/CN219932816U/en active Active
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