CN216306543U - Clutch master cylinder with displacement sensor, clutch device and vehicle - Google Patents
Clutch master cylinder with displacement sensor, clutch device and vehicle Download PDFInfo
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- CN216306543U CN216306543U CN202121617236.1U CN202121617236U CN216306543U CN 216306543 U CN216306543 U CN 216306543U CN 202121617236 U CN202121617236 U CN 202121617236U CN 216306543 U CN216306543 U CN 216306543U
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- master cylinder
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Abstract
The utility model relates to the field of clutch devices, in particular to a clutch master cylinder with a displacement sensor, a clutch device and a vehicle. The clutch master cylinder with the displacement sensor comprises a cylinder body, a piston, a magnetic ring, the displacement sensor, a cutting sleeve and a push rod assembly; the utility model provides a clutch master cylinder with a displacement sensor, which provides a specific structure of a cutting sleeve, on one hand, an inseparable connection state can be formed between a connecting end of a push rod assembly and a sleeve-shaped part of a cutting sleeve through a mounting groove on a piston, on the other hand, an inseparable connection state can be formed between the cutting sleeve and the piston through clamping a plurality of deformation parts of the cutting sleeve in the mounting groove respectively, so that a skilled person can clearly know that after the push rod assembly is connected to the piston through the cutting sleeve, the push rod assembly, the cutting sleeve and the piston are inseparable from each other.
Description
Technical Field
The utility model relates to the field of clutch devices, in particular to a clutch master cylinder with a displacement sensor, a clutch device and a vehicle.
Background
In the prior art, the name is provided: a plastic clutch master cylinder with a displacement switch, which is disclosed in patent application No. 201720688721.5. In the patent document, a specific technical scheme includes a hydraulic assembly and a displacement switch assembly, wherein the hydraulic assembly includes a pump body, a piston, a main leather collar, an auxiliary leather collar and a push rod assembly, the displacement switch assembly includes a displacement switch and a magnet, and a guide sleeve is arranged between the pump body and the piston; the cassette is detachably connected with the push rod assembly.
However, in the above patent document, a specific structure of the cartridge is not proposed, and thus, those skilled in the art cannot know from the patent document: how to connect the push rod component and the clamping seat and how to connect the clamping seat and the piston.
Therefore, in the prior art, how to connect the push rod assembly with the piston is a technical problem to be solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem of how to connect a push rod assembly with a piston in the prior art, the utility model provides a clutch master cylinder with a displacement sensor, a clutch device and a vehicle.
In order to achieve the purpose, the utility model adopts the technical scheme that:
according to one aspect of the utility model, a clutch master cylinder with a displacement sensor is provided, which comprises a cylinder body, a piston, a magnetic ring, the displacement sensor, a cutting sleeve and a push rod assembly;
the magnetic ring is arranged on the piston, the piston and the magnetic ring are respectively arranged in the cylinder body, and the displacement sensor is arranged on the cylinder body, wherein the displacement sensor can receive the magnetic force of the magnetic ring;
the push rod assembly is connected to the piston through the ferrule, wherein the piston driven only by the push rod assembly is capable of reciprocating relative to the cylinder;
the cutting ferrule has cover form portion and a plurality of deformation portion, wherein, be provided with the mounting groove on the piston, any deformation portion can block be in the mounting groove, one of them one end of push rod subassembly is the link, the link can by cover form portion cover is established, the link with cover form portion interference connects.
Further, one axial end of the piston is a driving end, the mounting groove and the surface of the driving end form a mounting opening, and the mounting groove extends towards the interior of the piston along the driving end;
the mounting opening is provided with an annular clamping part along the circumferential direction to the central direction of the piston, wherein when the clamping sleeve is arranged in the mounting groove, any deformation part is respectively in close contact with the clamping part.
Further, a gap is formed between every two adjacent deformation parts.
Further, the magnetic ring has a first position and a second position relative to the displacement sensor, and the piston is configured to drive the magnetic ring to move between the first position and the second position, wherein when the magnetic ring is in the first position, the magnetic field of the magnetic ring intersects with the displacement sensor, and when the magnetic ring is in the second position, the magnetic field of the magnetic ring is separated from the displacement sensor.
Further, the cylinder is provided with a first port;
the piston can penetrate through the first opening, and the piston and the cylinder body form a telescopic state.
Further, the cylinder is provided with a second port;
the elastic piece is arranged at the second mouth part and is limited in the outline of the second mouth part.
Further, a part of the cylinder body is extended to form a funnel-shaped modeling part;
the shaping part is provided with a flaring opening and a narrow opening, and the second opening part is positioned at the flaring opening.
Furthermore, a sealing ring, a positioning ring and a baffle are arranged at the flaring opening;
the positioning ring and the sealing ring are separated by the elastic sheet, wherein the sealing ring is arranged between the elastic sheet and the inner wall of the modeling part;
the positioning ring is arranged between the elastic sheet and the inner wall of the modeling part, and the positioning ring is detachably connected with the inner wall of the modeling part;
the baffle plate is used for covering the flaring, wherein the sealing ring, the positioning ring and the elastic sheet are limited in the outline of the combination of the baffle plate and the shaping part.
According to an aspect of the present invention, there is provided a clutch device including a clutch master cylinder having a displacement sensor as described above.
According to an aspect of the utility model, a vehicle is provided, comprising a clutch master cylinder as described above with a displacement sensor.
The technical scheme has the following advantages or beneficial effects:
the utility model provides a clutch master cylinder with a displacement sensor, which provides a specific structure of a cutting sleeve, on one hand, an inseparable connection state can be formed between a connecting end of a push rod assembly and a sleeve-shaped part of a cutting sleeve through a mounting groove on a piston, on the other hand, an inseparable connection state can be formed between the cutting sleeve and the piston through clamping a plurality of deformation parts of the cutting sleeve in the mounting groove respectively, so that a skilled person can clearly know that after the push rod assembly is connected to the piston through the cutting sleeve, the push rod assembly, the cutting sleeve and the piston are inseparable from each other.
Drawings
Fig. 1 is a schematic structural diagram of a clutch master pump with a displacement sensor according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a clutch master pump with a displacement sensor according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a piston provided in embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a cylinder provided in embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a part of the cylinder provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a ferrule provided in embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a ferrule provided in embodiment 1 of the present invention.
Detailed Description
Example 1:
in the present embodiment, referring to fig. 1 to 7, a clutch master cylinder with a displacement sensor is provided, which includes a cylinder 1, a piston 2, a magnetic ring 3, a displacement sensor 4, a ferrule 5 and a push rod assembly 6;
the magnetic ring 3 is arranged on the piston 2, the piston 2 and the magnetic ring 3 are respectively arranged in the cylinder body 1, and the displacement sensor 4 is arranged on the cylinder body 1, wherein the displacement sensor 4 can receive the magnetic force of the magnetic ring 3;
the push rod assembly 6 is connected to the piston 2 through a ferrule 5, wherein the piston 2 driven only by the push rod assembly 6 can reciprocate relative to the cylinder 1;
Referring to fig. 1, the magnetic ring 3 is sleeved on the piston 2, the magnetic ring 3 and the piston 2 are both arranged inside the cylinder 1, and when the piston 2 is driven by the push rod assembly 6 to reciprocate relative to the cylinder 1, the magnetic ring 3 reciprocates relative to the cylinder 1 along with the movement of the piston 2.
Referring to fig. 2, a displacement sensor 4 is disposed on the cylinder 1, wherein the displacement sensor 4 is configured to receive a magnetic force of the magnetic ring 3 and generate different electrical signals according to the presence or absence of the received magnetic force; for example: when the displacement sensor 4 receives the magnetic force of the magnetic ring 3, the displacement sensor 4 can send out an electric signal, and when the displacement sensor 4 does not receive the magnetic force of the magnetic ring 3, the displacement sensor 4 can interrupt the electric signal sent out. In other words, the position of the magnetic ring 3 relative to the displacement sensor 4 can be judged by control components such as a vehicle controller or an ECU of the vehicle according to the existence or nonexistence of the received electric signal sent by the displacement sensor 4; if the current control components such as the vehicle control unit or the ECU receive the electric signal sent by the displacement sensor 4, it can be known that the magnetic ring 3 is close to the displacement sensor 4, and then the current position of the piston 2 relative to the cylinder body 1 can be known, and if the current control components such as the vehicle control unit or the ECU do not receive the electric signal sent by the displacement sensor 4, it can be known that the magnetic ring 3 is far away from the displacement sensor 4, and then the current position of the piston 2 relative to the cylinder body 1 can be known.
Referring to fig. 1, 6 and 7, the piston 2 and the push rod assembly 6 are connected through the sleeve 5, wherein the sleeve 5 is provided with a sleeve-shaped portion 501, so that the sleeve 5 can be sleeved on the connecting end of the push rod assembly 6, and the sleeve-shaped portion 501 and the connecting end form an interference connection; meanwhile, the piston 2 is provided with a mounting groove 201, and the cutting sleeve 5 is provided with a plurality of deformation parts 502, so that when the cutting sleeve 5 is arranged in the mounting groove 201, the deformation parts 502 can be respectively clamped in the mounting groove 201, and the cutting sleeve 5 and the piston 2 can not be separated; after the push rod assembly 6 is connected to the piston 2 through the ferrule 5, the ferrule 5 is limited by the inner wall of the mounting groove 201, so that the ferrule 5 cannot deform in the radial direction, or the ferrule 5 has a smaller deformation in the radial direction, so that the connecting end of the push rod assembly 6 is limited inside the sleeve-shaped portion 501, and an inseparable state is formed between the connecting end of the push rod assembly 6 and the sleeve-shaped portion 501.
It will be appreciated that in the foregoing, the power source for the reciprocating motion of the piston 2 relative to the cylinder 1 is only the push rod assembly 6; in other words, under the condition that no spring is arranged between the piston 2 and the cylinder 1, only the push rod assembly 6 reciprocates relative to the cylinder 1, and then the push rod assembly 6 can push or pull the piston 2 to move relative to the cylinder 1, so that the piston 2 can reciprocate relative to the cylinder 1.
In the prior art (a plastic clutch master cylinder with a displacement switch, application No. 201720688721.5), although a technical scheme that a push rod assembly is connected to a piston through a clamping seat is provided, a specific structure of the clamping seat is not provided, so that a person skilled in the art cannot know how the push rod assembly is connected to the piston through the clamping seat, and further, the person skilled in the art cannot know whether a combination of the push rod assembly and the clamping seat can be separated from the piston.
In this embodiment, a specific structure of cutting ferrule 5 is proposed, on the one hand, mounting groove 201 on accessible piston 2 and the cover form portion 501 of cutting ferrule 5, realize forming inseparable connected state between the link of push rod subassembly 6 and the cover form portion 501, on the other hand, a plurality of deformation portion 502 of accessible cutting ferrule 5 block respectively in mounting groove 201, and realize forming inseparable connected state between cutting ferrule 5 and the piston 2, thereby, the acquaintance that can be clear to the skilled in the art, push rod subassembly 6 passes through cutting ferrule 5 and connects behind piston 2, push rod subassembly 6, mutual inseparable between cutting ferrule 5 and the piston 2.
Therefore, the clutch master cylinder with the displacement sensor provided by the embodiment solves the technical problem of how to connect the push rod assembly with the piston in the prior art.
Further, in the foregoing, how the ferrule 5 is specifically engaged in the mounting groove 201 is preferably implemented by the following technical scheme:
referring to fig. 3, one axial end of the piston 2 is a driving end, a mounting opening is formed by the mounting groove 201 and the surface of the driving end, and the mounting groove 201 extends towards the inside of the piston 2 along the driving end;
the mounting opening forms an annular engaging portion 202 along the circumferential to center direction of the piston 2, wherein when the ferrule 5 is disposed in the mounting groove 201, any one of the deformation portions 502 is in close contact with the engaging portion 202, respectively.
Before the cutting sleeve 5 is arranged in the mounting groove 201 of the piston 2, the cutting sleeve 5 should be firstly sleeved on the connecting end of the push rod component 6; during the process that the cutting sleeve 5 is arranged in the mounting groove 201 of the piston 2, the cutting sleeve 5 and the push rod assembly 6 move together, the sleeve-shaped part 501 of the cutting sleeve 5 should firstly pass through the annular clamping part 202, and then the deformation parts 502 of the cutting sleeve 5 pass through the annular clamping part 202; wherein, when the deformation portions 502 of the ferrule 5 do not penetrate between the engaging portions 202, the profile formed by the deformation portions 502 is relatively large, and thus, in the process that the ferrule 5 penetrates through the engaging portions 202, the deformation portions 502 can respectively contact the engaging portions 202, so that the deformation portions 502 are deformed by the acting force of the engaging portions 202, and the profile of the deformation portions 502 is reduced from large to small, so that the deformation portions 502 absorb energy due to deformation, until the ferrule 5 completely penetrates through the engaging portions 202, the deformation portions 502 release energy, and the profile of the deformation portions 502 is reduced from small to large, so that the deformation portions 502 can be in close contact with the engaging portions 202, and the ferrule 5 is engaged in the mounting groove 201.
Further, referring to fig. 6 or fig. 7, a gap 503 is provided between two adjacent deformation portions 502.
When a plurality of deformation portions 502 are deformed by the action of the engaging portion 202, the distance between any adjacent two adjacent deformation portions 502 is in a reduced state, in other words, the gap 503 between any two adjacent deformation portions 502 can make any one deformation portion 502 have a deformation space, so that when any two deformation portions 502 are deformed, the distance between the two adjacent deformation portions 502 can be reduced, and finally the outline of the plurality of deformation portions 502 can be reduced.
Further, the magnetic ring 3 has a first position and a second position relative to the displacement sensor 4, and the piston 2 is configured to drive the magnetic ring 3 to move between the first position and the second position, wherein when the magnetic ring 3 is in the first position, the magnetic field of the magnetic ring 3 intersects with the displacement sensor 4, and when the magnetic ring 3 is in the second position, the magnetic field of the magnetic ring 3 is separated from the displacement sensor 4.
When the magnetic ring 3 is in the first position, the magnetic field of the magnetic ring 3 intersects the displacement sensor 4, so that the displacement sensor 4 can receive the magnetic force of the magnetic ring 3; when the magnetic ring 3 moves from the first position to the second position, the displacement sensor 4 gradually changes from a state of receiving the magnetic force of the magnetic ring 3 to a state of losing the magnetic force of the magnetic ring 3; when the magnetic ring 3 is located at the second position, the displacement sensor 4 cannot receive the magnetic force of the magnetic ring 3.
Further, referring to fig. 4, the cylinder 1 is provided with a first port 101;
the piston 2 can penetrate the first port 101, and the piston 2 and the cylinder 1 are formed in a telescopic state.
Wherein a gap may be formed between the piston 2 and the first port 101, thereby facilitating the piston 2 to be disposed in the cylinder 1 through the first port 101.
It should be understood that, in order to avoid the negative effects of the eccentric wear of the main and auxiliary leather rings on the piston 2 caused by the offset of the axial line of the piston 2 from the axial line of the cylinder 1 during the reciprocating motion of the piston 2, it is preferable to provide a guide sleeve on the piston 2, such as: guide sleeves may be respectively provided between both ends of the piston 2 and outside the main and sub-rings. The guide sleeve is confined in the gap between the piston 2 and the cylinder 1, and the guide sleeve can contact the piston 2 and the cylinder 1, respectively. In actual installation, the main leather collar and the auxiliary leather collar should be firstly arranged in the cylinder body 1, then the guide sleeve is arranged on the piston 2, and then the piston 2 provided with the guide sleeve is arranged in the cylinder body 1 through the first opening 101, wherein one of the guide sleeve and the piston 2 can penetrate through the main leather collar and the auxiliary leather collar respectively.
In addition, since the aforementioned magnetic ring 3 is disposed on the piston 2, the magnetic ring 3 can penetrate the first port 101 together with the piston 2.
It should be understood that, in order to avoid the negative phenomenon that the piston 2 is separated from the cylinder 1 through the first port portion 101 after the piston 2 is disposed in the cylinder 1, the piston 2 should be confined in the cylinder 1; specifically, a clamping groove may be provided on the inner wall of the cylinder 1 at the first port 101, and the piston 2 may be confined in the cylinder 1 by a combination of the clamping groove and the cylinder 1 with a retainer ring disposed in the clamping groove. In the case where a retaining ring is provided, the combination of the connecting end of the push rod assembly 6 and the ferrule 5 should be able to penetrate the retaining ring so that the ferrule 5 can be disposed in the mounting groove 201 on the piston 2 located in the cylinder 1.
Further, referring to fig. 4 or 5, the cylinder 1 is provided with a second port portion 102;
an elastic piece 01 is arranged at the second mouth part 102, and the elastic piece 01 is limited in the outline of the second mouth part 102.
The elastic sheet 01 can deform under the condition of pressure, and the elastic sheet 01 can restore to the original shape under the condition of pressure loss; in the present embodiment, the cylinder 1 is filled with brake fluid, so that the brake fluid can generate a hydraulic pressure in the cylinder 1, and the hydraulic pressure can act on the elastic sheet 01 at the second port 102; when the piston 2 is driven by the push rod assembly 6, so that the hydraulic pressure of the brake fluid in the cylinder 1 is increased, the elastic sheet 01 is deformed under the action of the hydraulic pressure, and therefore, a part of hydraulic pressure is absorbed to store energy, on the contrary, when the piston 2 is driven by the push rod assembly 6, so that the hydraulic pressure of the brake fluid in the cylinder 1 is reduced, the elastic sheet 01 releases energy, so that in the process of recovering the elastic sheet 01, the elastic sheet 01 can supplement pressure to the brake fluid, and therefore, the pressure change amount of the brake fluid in the cylinder 1 is smooth.
Specifically, referring to fig. 4 or 5, a portion of the cylinder 1 is extended to form a funnel-shaped molding portion 11;
the shaping portion 11 has a flare and a narrow mouth, and the second mouth 102 is located at the flare.
A part of the cylinder body 11 is arranged to be the funnel-shaped modeling part 11, so that the structure inside the cylinder body 1 is not damaged, and meanwhile, a better installation position is provided for the elastic sheet 01, so that the elastic sheet 01 has enough deformation space, and the space occupied by the cylinder body 1 is reduced as much as possible.
Further, referring to fig. 5, a sealing ring 02, a positioning ring 03 and a blocking piece 04 are further arranged at the flaring;
the positioning ring 03 and the sealing ring 02 are separated by an elastic sheet 01, wherein the sealing ring 02 is arranged between the elastic sheet 01 and the inner wall of the modeling part 11;
the positioning ring 03 is arranged between the elastic sheet 01 and the inner wall of the modeling part 11, and the positioning ring 03 is detachably connected with the inner wall of the modeling part 11;
the flap 04 serves to cover the flare, wherein the sealing ring 02, the positioning ring 03 and the resilient tab 01 are confined within the contour of the combination of the flap 04 and the shaping 11.
The sealing ring 02 is arranged between the elastic sheet 01 and the cylinder body 1, and when the elastic sheet 01 is pressed on the cylinder body 1 by the positioning ring 03, the elastic sheet 01 is pressed by the positioning ring 03, so that the elastic sheet 01 is in an inseparable state relative to the cylinder body 1; the seal ring 02 seals a gap between the elastic piece 01 and the cylinder 1, and prevents brake fluid from flowing from the second port 102 to the outside of the cylinder 11. The positioning ring 03 is preferably a steel wire retainer ring.
The baffle plate 04 covers the second opening part 102, and the sealing ring 02, the positioning ring 03 and the elastic sheet 01 can be arranged in a space formed between the baffle plate 04 and the modeling part 11; the blocking sheet 04 is used for blocking the elastic sheet 01 and preventing an object outside the cylinder body 1 from contacting the elastic sheet 01.
Example 2:
in this embodiment, there is provided a clutch device including the clutch master cylinder having the displacement sensor as in embodiment 1 described above.
Example 3:
in this embodiment, a vehicle is provided that includes the master clutch pump having the displacement sensor as in embodiment 1 described above.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The clutch master cylinder with the displacement sensor is characterized by comprising a cylinder body, a piston, a magnetic ring, the displacement sensor, a clamping sleeve and a push rod assembly;
the magnetic ring is arranged on the piston, the piston and the magnetic ring are respectively arranged in the cylinder body, and the displacement sensor is arranged on the cylinder body, wherein the displacement sensor can receive the magnetic force of the magnetic ring;
the push rod assembly is connected to the piston through the ferrule, wherein the piston driven only by the push rod assembly is capable of reciprocating relative to the cylinder;
the cutting ferrule has cover form portion and a plurality of deformation portion, wherein, be provided with the mounting groove on the piston, any deformation portion can block be in the mounting groove, one of them one end of push rod subassembly is the link, the link can by cover form portion cover is established, the link with cover form portion interference connects.
2. The clutch master cylinder with the displacement sensor as claimed in claim 1, wherein one axial end of the piston is a driving end, the mounting groove forms a mounting opening with a surface of the driving end, and the mounting groove extends toward an inside of the piston along the driving end;
the mounting opening is provided with an annular clamping part along the circumferential direction to the central direction of the piston, wherein when the clamping sleeve is arranged in the mounting groove, any deformation part is respectively in close contact with the clamping part.
3. The clutch master cylinder with the displacement sensor as claimed in claim 1, wherein a gap is provided between adjacent two of the deformation portions.
4. The clutch master cylinder with displacement sensor of claim 1, wherein the magnetic ring has a first position and a second position relative to the displacement sensor, the piston for driving the magnetic ring between the first position and the second position, wherein the magnetic field of the magnetic ring intersects the displacement sensor when the magnetic ring is in the first position and the magnetic field of the magnetic ring is decoupled from the displacement sensor when the magnetic ring is in the second position.
5. The clutch master cylinder with a displacement sensor according to any one of claims 1 to 4, characterized in that the cylinder body is provided with a first port portion;
the piston can penetrate through the first opening, and the piston and the cylinder body form a telescopic state.
6. The clutch master cylinder with a displacement sensor according to any one of claims 1 to 4, characterized in that the cylinder body is provided with a second port portion;
an elastic sheet is arranged at the second mouth part and is limited in the outline of the second mouth part.
7. The clutch master cylinder with the displacement sensor as claimed in claim 6, wherein a portion of the cylinder is extended to be provided as a funnel-shaped molding;
the shaping part is provided with a flaring opening and a narrow opening, and the second opening part is positioned at the flaring opening.
8. The clutch master cylinder with the displacement sensor as claimed in claim 7, wherein a sealing ring, a positioning ring and a baffle plate are further arranged at the flaring opening;
the positioning ring and the sealing ring are separated by the elastic sheet, wherein the sealing ring is arranged between the elastic sheet and the inner wall of the modeling part;
the positioning ring is arranged between the elastic sheet and the inner wall of the modeling part, and the positioning ring is detachably connected with the inner wall of the modeling part;
the baffle plate is used for covering the flaring, wherein the sealing ring, the positioning ring and the elastic sheet are limited in the outline of the combination of the baffle plate and the shaping part.
9. Clutch device, characterized in that it comprises a clutch master cylinder with displacement sensor according to any of claims 1 to 8.
10. Vehicle, characterized in that it comprises a master clutch pump with displacement sensor according to any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121617236.1U CN216306543U (en) | 2021-07-16 | 2021-07-16 | Clutch master cylinder with displacement sensor, clutch device and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121617236.1U CN216306543U (en) | 2021-07-16 | 2021-07-16 | Clutch master cylinder with displacement sensor, clutch device and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216306543U true CN216306543U (en) | 2022-04-15 |
Family
ID=81087070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121617236.1U Active CN216306543U (en) | 2021-07-16 | 2021-07-16 | Clutch master cylinder with displacement sensor, clutch device and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216306543U (en) |
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2021
- 2021-07-16 CN CN202121617236.1U patent/CN216306543U/en active Active
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