CN219510051U - Automobile brake drum - Google Patents
Automobile brake drum Download PDFInfo
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- CN219510051U CN219510051U CN202320563916.2U CN202320563916U CN219510051U CN 219510051 U CN219510051 U CN 219510051U CN 202320563916 U CN202320563916 U CN 202320563916U CN 219510051 U CN219510051 U CN 219510051U
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- rim
- flange
- arc
- flange part
- brake drum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
The utility model discloses an automobile brake drum, which comprises a rim part, a flange part and an arc-shaped connecting part which is concave towards the central shaft of the rim part, wherein one end of the rim part is connected with the side surface of the flange part through the arc-shaped connecting part; the flange part is provided with a plurality of bolts and a plurality of bolt holes, one end of the flange part, which is close to the rim part, is provided with a thickening part, the thickening part is provided with a relief groove for placing nuts of the bolts, and a blocking piece for preventing the bolts from rotating is arranged in the bolt holes; the outer side of one end of the rim part is provided with a group of heat dissipation convex ring layers with wavy sections, the outer side of the other end of the rim part is provided with a convex table group, and the diameter of the convex table group is gradually decreased towards the direction away from the flange part; the utility model can avoid integral cracking caused by thermal collision or bolt rotation by reinforcing the structures of the flange part and the rim part for multiple times, and has the advantages of high structural strength, high braking performance and long service life.
Description
Technical Field
The utility model relates to the technical field of brake drums, in particular to an automobile brake drum.
Background
The brake drum is a brake tool of an automobile, braking force is generated by utilizing friction resistance between two brake shoes in the drum brake and the brake drum, and the brake drum is used as a key part for generating the braking force in the drum brake, and the structural performance of the brake drum seriously affects the running safety of the automobile; the existing brake drum consists of a rim part and a flange part, wherein the flange part is arranged at the narrow end of the rim part, the flange part is provided with a mounting hole and a mounting bolt, the mounting bolt is in interference fit with the mounting hole, however, after the mounting bolt is required to be replaced or the flange part expands with heat and contracts with cold, the problem that the flange is broken due to shaking caused by rotation of the mounting bolt is very easy to occur, and as the wall thickness of the rim part is generally 10-20mm, the thickness of the flange part is generally 14-16mm, the thickness is thinner, the strength is low, after an automobile is braked frequently or for a long time, the inner part of the brake drum body accumulates too high heat due to friction, so that the flange and the side wall of the brake drum generate thermal fatigue cracks, and the brake drum service life is shortened, and the driving safety is influenced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide the automobile brake drum which is used for preventing the whole automobile brake drum from cracking due to the collision caused by heating and has the advantages of high structural strength, long service life and high braking performance.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an automobile brake drum comprises a rim part, a flange part and an arc-shaped connecting part which is concave towards the central axis of the rim part, wherein one end of the rim part is connected with the side surface of the flange part through the arc-shaped connecting part; the flange part is provided with a plurality of bolts and a plurality of bolt holes, one end of the flange part, which is close to the rim part, is provided with a thickening part, the thickening part is provided with a yielding groove for placing nuts of the bolts, and a blocking piece for preventing the bolts from rotating is arranged in the bolt holes; the outer side of rim portion one end is provided with the heat dissipation bulge loop layer that a set of cross-section was the wave setting, the outer side of rim portion other end is provided with boss group, boss group is the diameter and is keeping away from the direction of flange portion reduces the setting.
Further set up: the flange part and the thickening part are integrally formed, and the thickness and the range between the flange part and the thickening part are [19,22] mm.
Further set up: the outer side of the heat dissipation convex ring layer is gradually expanded towards the direction away from the flange part.
Further set up: the blocking piece is an anti-skid groove, the anti-skid groove is positioned on the inner wall of one end of the bolt hole, which is close to the abdication groove, anti-skid lines are arranged at the bottom of the abdication groove, and the section of the anti-skid groove is in a zigzag structure, a trapezoid structure or a circular arc structure.
Further set up: the blocking piece is a blocking piece, the blocking piece is located on the inner side of one end, far away from the abdication groove, of the bolt hole, and a limit groove for the blocking piece to pass through is formed in one side of the tail end of the bolt.
Further set up: the one end that arc connecting portion is close to flange portion is connected with towards keeping away from the protruding arc of rim portion center pin evagination, protruding arc with be provided with between the flange portion towards being close to the concave arc of rim portion center pin indent, protruding arc with flange portion passes through concave arc transitional coupling.
Further set up: a group of reinforcing ribs arranged in a V shape are arranged on the outer side in the middle of the rim part, and the heat dissipation convex ring layer is connected with the boss group through the reinforcing ribs
Further set up: the novel wheel rim is characterized in that an annular abrasion marking plate is embedded in the other end of the wheel rim, the abrasion marking plate is an annular steel plate, a group of scale grooves for observing abrasion length are formed in the inner side of the other end of the wheel rim, and the scale grooves are arranged in a staggered mode along the circumferential direction of the wheel rim.
In summary, the utility model avoids the situation that the flange part is broken due to the thinner thickness of the flange part by the thickened part, and plays roles of improving the structural strength of the flange part and prolonging the service life of the flange part; the nut is abducted through the abdication groove, so that the mutual interference abrasion of the nut protuberance of the bolt and the brake shoe is avoided, and the functions of improving the braking performance and further improving the strength of the whole structure are achieved; the blocking piece prevents the flange from being broken due to shaking caused by rotation of the bolt, and plays a role in further improving the structural stability of the flange; the heat dissipation area of the side face of the rim part is increased through the heat dissipation convex ring layer which is arranged in a wave shape and the convex table group with the diameter decreasing towards the direction far away from the flange part, and meanwhile, the stress concentration at the two ends of the rim part is dispersed, so that the effects of improving the structural strength of one end of the rim part and prolonging the service life of the rim part are achieved; the arc-shaped connecting part plays a role in further improving the structural strength and the service life of the connecting part between the flange part and the rim part; the utility model avoids integral cracking caused by heated collision or bolt rotation, and has the advantages of high structural strength, long service life and high braking performance.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present utility model;
FIG. 2 is a cross-sectional view of a first embodiment of the utility model;
FIG. 3 is a cross-sectional view of three cleat according to a first embodiment of the present utility model;
FIG. 4 is a schematic view of a portion of a structure of a first embodiment of the present utility model;
FIG. 5 is a schematic diagram of a second embodiment of the present utility model;
fig. 6 is a cross-sectional view of a second embodiment of the present utility model.
In the figure: 1. a rim portion; 2. a flange portion; 3. an arc-shaped connecting part; 4. a bolt; 5. bolt holes; 6. a thickened portion; 7. a relief groove; 8. a blocking member; 9. a heat dissipation convex ring layer; 10. a boss set; 11. an anti-skid groove; 12. a blocking piece; 13. a limit groove; 14. convex arc; 15. a concave arc; 16. reinforcing ribs; 17. a wear indicator plate; 18. a scale groove; 19. anti-skid lines.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings. It should be noted that the words "upper" and "lower" used in the following description refer to directions in fig. 2, and the words "bottom" and "top" refer to directions toward the geometric center of a particular component in fig. 1.
The most critical concept of the utility model is as follows: through the thickened part 6, the structure strength and the service life of the flange part 2 are improved; the nut protuberance of the bolt 4 and the brake shoe are prevented from being interfered and worn by each other through the abdication groove 7, so that the braking performance and the integral structural strength are improved; the blocking piece 8 prevents the flange part 2 from being broken due to shaking caused by rotation of the bolt 4, and plays a role in further improving the structural strength and the service life of the flange part 2; the heat dissipation convex ring layer 9 and the boss group 10 play roles in improving the structural strength of the rim part 1 and prolonging the service life of the rim part 1; the arc-shaped connecting part 3 plays a role in improving the structural strength and the service life of the connecting part between the flange part 2 and the rim part 1;
the utility model can avoid the integral cracking caused by the collision of heated or the rotation of the bolt 4 by reinforcing the structures of the flange part 2 and the rim part 1 for a plurality of times, and has the advantages of high structural strength, long service life and high braking performance.
Referring to fig. 1 to 6, an automobile brake drum comprises a rim portion 1, a flange portion 2, and an arc-shaped connecting portion 3 recessed toward a central axis of the rim portion 1, wherein one end of the rim portion 1 is connected with a side surface of the flange portion 2 through the arc-shaped connecting portion 3; the flange part 2 is provided with a plurality of bolts 4 and a plurality of bolt holes 5, one end of the flange part 2, which is close to the rim part 1, is provided with a thickening part 6, the thickening part 6 is provided with a yielding groove 7 for placing nuts of the bolts 4, and a blocking piece 8 for preventing the bolts 4 from rotating is arranged in the bolt holes 5; the outside of rim portion 1 one end is provided with a set of cross-section and is the heat dissipation bulge loop layer 9 that the wave set up, and the outside of rim portion 1 other end is provided with boss group 10, and boss group 10 is the diameter and is the direction of keeping away from flange portion 2 and decrease the setting.
As can be seen from the above description, the thickened portion 6 is used to increase the thickness of the flange portion 2, so as to enhance the structural strength of the flange portion 2, avoid the situation that the flange portion 2 is broken due to the thinner thickness of the flange portion 2 in the process of connecting the flange portion 2 with other components and transmitting torque in that line, and achieve the effects of improving the overall structural strength and prolonging the service life of the flange portion 2; the nut of the bolt 4 is fully placed in the abdication groove 7 through the abdication groove 7, so that the problems that the braking performance and the structural stability of the flange part 2 are affected due to the mutual interference and abrasion of the nut protuberance of the bolt 4 and the brake shoe are avoided under the condition that the flange part 2 is thickened, and the functions of abdication of the nut of the bolt 4, improvement of the braking performance and further improvement of the integral structural strength are achieved; the blocking piece 8 prevents the bolt 4 from rotating in the bolt hole 5, so that the flange is prevented from being broken due to shaking caused by rotation of the bolt 4, and the structural stability of the flange part 2 is further improved;
the heat dissipation area of the side surface of the rim part 1 is increased through the wave-shaped heat dissipation convex ring layer 9, so that the situation that the side wall of one end of the rim part 1 generates thermal fatigue cracks due to the fact that excessive heat is accumulated in the drum body of the brake drum is avoided, and meanwhile, the stress concentration of one end of the rim part 1 is dispersed, and the effects of improving the structural strength of one end of the rim part 1 and prolonging the service life of the rim part 1 are achieved; the boss group 10 with the diameter gradually decreasing towards the direction far away from the flange part 2 is used for increasing the thickness and the heat dissipation area of the other end of the rim part 1, improving the deformation resistance of the other end of the rim part 1, being beneficial to ensuring the stability of the structure of the rim part 1, avoiding the cracking of the other end of the rim part 1 caused by thermal expansion, and playing a role in improving the structural strength and the rigidity of the other end of the rim part 1; through arc connecting portion 3, eliminate flange portion 2 and rim portion 1 and produce stress concentration in the in-process of heat treatment, can alleviate instantaneous impact, increase heat radiating area, play the effect that further improves holistic structural strength and life.
Further: the flange part 2 and the thickened part 6 are integrally formed, and the thickness and the range between the flange part 2 and the thickened part 6 are 19,22 mm.
As is apparent from the above description, by providing the flange portion 2 and the thickened portion 6 as an integral molding, functions to reduce the overall manufacturing cost, reduce the difficulty of the manufacturing process, and improve the structural connection strength between the flange portion 2 and the thickened portion 6; through setting the thickness between flange portion 2 and the thickening portion 6 with in [19,22] mm, when guaranteeing that flange portion 2 structural strength is high, avoid brake shoe and flange portion 2 mutual interference to influence flange portion 2's structural stability, play the effect of further improving holistic structural strength.
Further: the outer side of the heat radiation convex ring layer 9 is gradually widened in a direction away from the flange part 2.
As is clear from the above description, by setting the outer side of the heat radiation convex ring layer 9 to be gradually expanded in a direction away from the flange portion 2, an acute angle is formed between the heat radiation convex ring and the bolt 4, and the function of ensuring the stability of the installation of the bolt 4 is performed by utilizing the principle that the triangular stability is good.
Further: the blocking piece 8 is an anti-skid groove 11, the anti-skid groove 11 is positioned on the inner wall of one end of the bolt hole 5, which is close to the abdication groove 7, the groove bottom of the abdication groove 7 is provided with anti-skid patterns 19, and the section of the anti-skid groove 11 is in a zigzag structure, a trapezoid structure or a circular arc structure.
As can be seen from the above description, the anti-skid groove 11 is used for increasing the friction between the side surface of the bolt 4 and the bolt hole 5, so as to primarily prevent the bolt 4 from rotating in the bolt hole 5, and perform the primary limiting and blocking function on the bolt 4; the anti-skid threads 19 are used for increasing friction between the nuts of the bolts 4 and the yielding grooves 7, so that the effect of performing secondary limiting and blocking on the bolts 4 is achieved; the flange is prevented from being broken due to shaking caused by rotation of the bolts 4, and the structural stability of the flange part 2 is further improved.
Further: the blocking piece 8 is a blocking block 12, the blocking block 12 is positioned on the inner side of one end of the bolt hole 5 far away from the abdication groove 7, and a limit groove 13 for the blocking block 12 to pass through is formed on one side of the tail end of the bolt 4.
As can be seen from the above description, through the blocking piece 12 and the limiting groove 13, when the bolt 4 rotates, the blocking piece 12 is located in the limiting groove 13 to block the rotation of the bolt 4, so as to perform a limiting blocking function on the bolt 4; the flange is prevented from being broken due to shaking caused by rotation of the bolts 4, and the structural stability of the flange part 2 is further improved.
Further: one end of the arc-shaped connecting part 3, which is close to the flange part 2, is connected with a convex arc 14 protruding outwards towards the central shaft away from the rim part 1, a concave arc 15 recessed inwards towards the central shaft close to the rim part 1 is arranged between the convex arc 14 and the flange part 2, and the convex arc 14 is in transitional connection with the flange part 2 through the concave arc 15.
As is apparent from the above description, the concave arc 15 is used to eliminate stress concentration generated between the arc-shaped connecting portion 3 and the flange portion 2 during heat treatment, and plays a role in improving the overall service life; when the arc-shaped connecting part 3 and the flange part 2 are impacted, two opposite reaction forces are respectively generated through the convex arc 14 and the concave arc 15, so that the impact toughness of the arc-shaped connecting part 3 and the flange part 2 is greatly improved, and the connection strength and the integral structural strength of the arc-shaped connecting part 3 and the flange part 2 are further enhanced.
Further: a group of reinforcing ribs 16 which are arranged in a V shape are arranged on the outer side of the middle of the rim part 1, and the heat dissipation convex ring layer 9 is connected with the boss group 10 through the reinforcing ribs 16.
As is apparent from the above description, the reinforcing ribs 16 are used to enhance the strength of the outer side surface in the middle of the rim portion 1, reduce the occurrence frequency of cracking of the outer side surface in the middle of the rim portion 1 due to thermal expansion, and improve the connection stability between the heat dissipation convex ring layer 9 and the boss group 10, thereby further improving the overall structural strength of the rim portion 1; the reinforcing ribs 16 are arranged in a V shape, so that the reinforcing ribs 16, the heat dissipation convex ring layer 9 and the boss group 10 form a triangle, and the connection stability between the heat dissipation convex ring and the boss group 10 is further improved by utilizing the principle of good triangle stability.
Further: the other end of the rim part 1 is internally embedded with an annular abrasion marking plate 17, the abrasion marking plate 17 is an annular steel plate, a group of scale grooves 18 for observing abrasion length are arranged on the inner side of the other end of the rim part 1, and the scale grooves 18 are arranged in a staggered manner along the circumferential direction of the rim part 1.
As can be seen from the above description, the wear mark plate 17 and the set of scale grooves 18, which are staggered with each other, serve to facilitate the service personnel to quickly determine the wear condition of the rim portion 1; by providing the wear indicator plate 17 as an annular steel plate, the structural strength of the rim portion 1 is further enhanced; in addition, the scale groove 18 also plays a role in heat dissipation.
Referring to fig. 1 to 6, a first embodiment provided by the present utility model is:
an automobile brake drum, as shown in fig. 1 and 2, comprises a rim part 1, a flange part 2 and an arc-shaped connecting part 3 which is concave inwards towards the central axis of the rim part 1, wherein one end of the rim part 1 is connected with the side surface of the flange part 2 through the arc-shaped connecting part 3;
as shown in fig. 1 and 2, the flange 2 is provided with a plurality of bolts 4 and a plurality of bolt holes 5, one end of the flange 2 near the rim 1 is provided with a thickening part 6, the thickening part 6 is provided with a relief groove 7 for placing nuts of the bolts 4, and a blocking piece 8 for preventing the bolts 4 from rotating is arranged in the bolt holes 5; the flange part 2 and the thickened part 6 are integrally formed, and the thickness and the range between the flange part 2 and the thickened part 6 are 19,22 mm;
as shown in fig. 2 and 3, the blocking member 8 is an anti-slip groove 11, the anti-slip groove 11 is positioned on the inner wall of one end of the bolt hole 5, which is close to the abdication groove 7, the groove bottom of the abdication groove 7 is provided with anti-slip lines 19, and the section of the anti-slip groove 11 is in a zigzag structure, a trapezoid structure or a circular arc structure.
As shown in fig. 1 and 2, a group of heat dissipation convex ring layers 9 with wavy cross sections are arranged on the outer side of one end of the rim part 1, and the outer sides of the heat dissipation convex ring layers 9 are gradually widened towards the direction away from the flange part 2; the outer side of the other end of the rim part 1 is provided with a boss group 10, and the diameter of the boss group 10 is gradually decreased towards the direction away from the flange part 2; a group of reinforcing ribs 16 which are arranged in a V shape are arranged on the outer side of the middle of the rim part 1, and the heat dissipation convex ring layer 9 is connected with the boss group 10 through the reinforcing ribs 16.
As shown in fig. 2 and 3, one end of the arc-shaped connecting portion 3, which is close to the flange portion 2, is connected with a convex arc 14 protruding outwards towards the central axis far away from the rim portion 1, a concave arc 15 recessed inwards towards the central axis close to the rim portion 1 is arranged between the convex arc 14 and the flange portion 2, and the convex arc 14 and the flange portion 2 are in transitional connection through the concave arc 15.
As shown in fig. 2 and 4, the other end of the rim 1 is embedded with a wear-indicating plate 17 in a ring shape, the wear-indicating plate 17 is a ring-shaped steel plate, a group of scale grooves 18 for observing the wear length are arranged on the inner side of the other end of the rim 1, and the scale grooves 18 are arranged in a staggered manner along the circumferential direction of the rim 1.
Embodiment two: the difference from the first embodiment is that, as shown in fig. 5 and 6, the blocking member 8 is a blocking block 12, the blocking block 12 is located at the inner side of one end of the bolt hole 5 far away from the yielding groove 7, and a limit groove 13 through which the blocking block 12 passes is provided at one side of the tail end of the bolt 4.
In conclusion, compared with the prior art, the utility model has the advantages of high structural strength, long service life and high braking performance; the thickened part 6 prevents the flange part 2 from being broken due to the thinner thickness of the flange part 2, thereby improving the structural strength of the flange part 2 and prolonging the service life of the flange part 2; the nut is abducted through the abdication groove 7, so that the mutual interference abrasion of the nut protuberance of the bolt 4 and the brake shoe is avoided, and the functions of improving the braking performance and further improving the integral structural strength are achieved; the blocking piece 8 prevents the flange part 2 from being broken due to shaking caused by rotation of the bolt 4, and plays a role in further improving the structural stability of the flange part 2; the heat dissipation area of the side surface of the rim part 1 is increased through the heat dissipation convex ring layer 9 which is arranged in a wave shape and the boss group 10 with the diameter decreasing towards the direction far away from the flange part 2, and meanwhile, the stress concentration at the two ends of the rim part 1 is dispersed, so that the functions of improving the structural strength at one end of the rim part 1 and prolonging the service life of the rim part 1 are achieved; through arc connecting portion 3, play the effect of further improving structural strength and life of the junction between flange portion 2 and rim portion 1.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (8)
1. An automobile brake drum, characterized in that: the flange comprises a rim part, a flange part and an arc-shaped connecting part which is concave towards the central axis of the rim part, wherein one end of the rim part is connected with the side surface of the flange part through the arc-shaped connecting part; the flange part is provided with a plurality of bolts and a plurality of bolt holes, one end of the flange part, which is close to the rim part, is provided with a thickening part, the thickening part is provided with a yielding groove for placing nuts of the bolts, and a blocking piece for preventing the bolts from rotating is arranged in the bolt holes; the outer side of rim portion one end is provided with the heat dissipation bulge loop layer that a set of cross-section was the wave setting, the outer side of rim portion other end is provided with boss group, boss group is the diameter and is keeping away from the direction of flange portion reduces the setting.
2. An automotive brake drum as claimed in claim 1, wherein: the flange part and the thickening part are integrally formed, and the thickness and the range between the flange part and the thickening part are [19,22] mm.
3. An automotive brake drum as claimed in claim 1, wherein: the outer side of the heat dissipation convex ring layer is gradually expanded towards the direction away from the flange part.
4. An automotive brake drum as claimed in claim 1, wherein: the blocking piece is an anti-skid groove, the anti-skid groove is positioned on the inner wall of one end of the bolt hole, which is close to the abdication groove, anti-skid lines are arranged at the bottom of the abdication groove, and the section of the anti-skid groove is in a zigzag structure, a trapezoid structure or a circular arc structure.
5. An automotive brake drum as claimed in claim 1, wherein: the blocking piece is a blocking piece, the blocking piece is located on the inner side of one end, far away from the abdication groove, of the bolt hole, and a limit groove for the blocking piece to pass through is formed in one side of the tail end of the bolt.
6. An automotive brake drum as claimed in claim 1, wherein: the one end that arc connecting portion is close to flange portion is connected with towards keeping away from the protruding arc of rim portion center pin evagination, protruding arc with be provided with between the flange portion towards being close to the concave arc of rim portion center pin indent, protruding arc with flange portion passes through concave arc transitional coupling.
7. An automotive brake drum as claimed in claim 1, wherein: the outer side in the middle of the rim part is provided with a group of reinforcing ribs which are arranged in a V shape, and the heat dissipation convex ring layer is connected with the boss group through the reinforcing ribs.
8. An automotive brake drum as claimed in claim 1, wherein: the novel wheel rim is characterized in that an annular abrasion marking plate is embedded in the other end of the wheel rim, the abrasion marking plate is an annular steel plate, a group of scale grooves for observing abrasion length are formed in the inner side of the other end of the wheel rim, and the scale grooves are arranged in a staggered mode along the circumferential direction of the wheel rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320563916.2U CN219510051U (en) | 2023-03-21 | 2023-03-21 | Automobile brake drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320563916.2U CN219510051U (en) | 2023-03-21 | 2023-03-21 | Automobile brake drum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219510051U true CN219510051U (en) | 2023-08-11 |
Family
ID=87526021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320563916.2U Active CN219510051U (en) | 2023-03-21 | 2023-03-21 | Automobile brake drum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219510051U (en) |
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2023
- 2023-03-21 CN CN202320563916.2U patent/CN219510051U/en active Active
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