CN210565622U - Eccentric error-proof bolt - Google Patents
Eccentric error-proof bolt Download PDFInfo
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- CN210565622U CN210565622U CN201921193046.4U CN201921193046U CN210565622U CN 210565622 U CN210565622 U CN 210565622U CN 201921193046 U CN201921193046 U CN 201921193046U CN 210565622 U CN210565622 U CN 210565622U
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Abstract
The utility model relates to the technical field of fasteners, in particular to an eccentric error-proofing bolt, which comprises a nut, a polished rod, a reducing rod, a threaded rod and an adjusting gasket; the nut, the polished rod, the reducing rod and the threaded rod are coaxial and are sequentially connected, and the nut, the polished rod, the reducing rod and the threaded rod are integrated; the adjusting gasket is eccentrically sleeved at one end of the polished rod close to the nut, and the adjusting gasket is in interference fit with the polished rod; the outer diameter of the polished rod is larger than that of the threaded rod, and the outer diameter of the threaded rod is larger than that of the reducing rod; the outer circumferential surface of the threaded rod is provided with a clamping groove which is radially sunken, the clamping groove is in a strip shape parallel to the axis of the threaded rod, and the reducing rod and the clamping groove are formed in one step through cold forging; the bolt is not easy to deform during manufacturing and has high qualification rate.
Description
Technical Field
The utility model relates to a fastener technical field, concretely relates to eccentric mistake proofing bolt.
Background
The eccentric screw is one kind of screw, and the bolt is one tool for fastening the parts of the equipment step by means of the physical and mathematical principles of the inclined circular rotation and friction of the object. Screws are a common term for fasteners.
With the development of science and technology, the technology is advanced, automobile products are changed day by day, the automobile products are necessary to be almost indispensable articles for daily life of people, and the positioning angle of a suspension system of a vehicle when the vehicle leaves a factory is preset according to design requirements. These positioning angles are used together to ensure safety and comfort of the vehicle. However, these positioning angles change due to wear of parts, rough road due to uneven road surface, replacement of chassis parts, replacement of tires, and the like after the vehicle has run for a certain period of time. Once the positioning angle changes for any reason, problems such as abnormal wear of the tire, accelerated wear of parts, drifting of the vehicle during running, increased fuel consumption, etc. may occur. When a common fastener is used in a suspension system, once the positioning angle deviation occurs, only the U-shaped inserting sheet is added, the shape of the original part is changed or the shape of the shock absorber is changed. The methods are time-consuming and labor-consuming, cannot ensure the running safety of the vehicle, and if the fundamental problem is solved, all parts of the chassis need to be replaced, so the method is high in cost.
The eccentric screw is mainly used for adjusting the inner and outer inclination angles and the heights of the left wheel and the right wheel, and is additionally installed when the phenomenon that the tires of the vehicle are eaten is found, so that the problem of abnormal abrasion of the tires of the vehicle is effectively solved.
Chinese patent CN208534945U discloses an eccentric bolt assembly and a vehicle having the same, wherein the eccentric bolt assembly includes: the adjusting device comprises a screw, an adjusting gasket and an eccentric gasket; the screw rod is provided with a head part and a rod part, the outer circumference surface of the first end of the rod part, which is close to the head part, is provided with a spline, and the adjusting gasket is sleeved on the periphery of the spline and is in interference fit with the spline; the eccentric gasket is sleeved at the second end of the rod part far away from the head part. The utility model provides an eccentric bolt subassembly can solve and be used for making the comparatively complicated problem of cold-heading technology of the screw rod of a body structure and the adoption of adjusting shim among the prior art.
The adjusting groove of the bolt disclosed in the patent is often thickened or even bent during the cold heading forming process.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an eccentric mistake proofing bolt, non-deformable when this bolt is made, the qualification rate is high.
To achieve the purpose, the utility model adopts the following technical proposal: the eccentric mistake-proofing bolt comprises a nut, a polished rod, a reducing rod, a threaded rod and an adjusting gasket;
the nut, the polished rod, the reducing rod and the threaded rod are coaxial and are sequentially connected, and the nut, the polished rod, the reducing rod and the threaded rod are integrated;
the adjusting gasket is eccentrically sleeved at one end of the polished rod close to the nut, and the adjusting gasket is in interference fit with the polished rod;
the outer diameter of the polished rod is larger than that of the threaded rod, and the outer diameter of the threaded rod is larger than that of the reducing rod;
the outer periphery of the threaded rod is provided with a first clamping groove which is radially sunken, the first clamping groove is in a strip shape parallel to the axis of the threaded rod, and the reducing rod and the first clamping groove are formed in one step through cold forging.
As a preferable scheme of the eccentric error-proofing bolt, the distance between the bottom end of the first clamping groove and the axis of the threaded rod is smaller than the distance between the bottom end of the thread of the threaded rod and the axis of the threaded rod.
As a preferred scheme of the eccentric error-proofing bolt, the projection of the first clamping groove along the axis direction of the threaded rod comprises a first bottom edge, a first oblique edge and a second oblique edge, the first oblique edge and the second oblique edge are respectively positioned at two sides of the first bottom edge and are respectively connected with two ends of the first bottom edge, and the first oblique edge, the first bottom edge and the second oblique edge are connected in a smooth transition manner; the first clamping groove is symmetrical relative to a radial plane of the threaded rod, the first bottom edge is parallel to a tangent line of a projection in the axial direction of the threaded rod, the distance between the first bottom edge and the axial line of the threaded rod is smaller than the distance between the bottom end of the thread of the threaded rod and the axial line of the threaded rod, and the included angle between the first oblique edge and the second oblique edge is 108-113 degrees.
As a preferred scheme of the eccentric error-proofing bolt, a second clamping groove is arranged at a position on the threaded rod, which is symmetrical to the first clamping groove relative to the axis of the threaded rod, the projection of the second clamping groove along the axis direction of the threaded rod comprises a second bottom edge, a third bevel edge and a fourth bevel edge, the third bevel edge and the fourth bevel edge are respectively positioned at two sides of the second bottom edge and are respectively connected with two ends of the second bottom edge, and the connection among the third bevel edge, the second bottom edge and the fourth bevel edge is in smooth transition; the second clamping groove is symmetrical relative to a radial plane of the threaded rod, the second bottom edge is parallel to a tangent of a projection in the axial direction of the threaded rod, the distance between the second bottom edge and the axial line of the threaded rod is equal to the distance between the first bottom edge and the axial line of the threaded rod, and an included angle between the third bevel edge and the fourth bevel edge is 85-90 degrees.
As a preferred scheme of an eccentric mistake proofing bolt, one end of the polished rod, which is close to the nut, is provided with a spline, the spline is in a gear ring shape, the adjusting gasket is in interference fit with the spline, and the axial length of the spline is equal to the thickness of the adjusting gasket.
As an optimal scheme of the eccentric mistake-proofing bolt, the adjusting shim is in a disc shape, a through hole which is parallel to the axis direction of the adjusting shim and penetrates through the adjusting shim is formed in the adjusting shim, the through hole is in interference fit with the spline, the through hole is eccentrically arranged relative to the adjusting shim, and the circumference of the through hole is intersected with the axis of the adjusting shim.
As a preferable scheme of the eccentric error-proof bolt, a dial is arranged on the disc surface of the adjusting shim, and the dial is arranged on the side far away from the through hole.
The utility model has the advantages that: the nut, the polished rod, the reducing rod and the threaded rod are combined into an outer hexagon bolt, the adjusting gasket is fixedly connected with the polished rod through a press riveting process, and a worker rotates the polished rod to enable the adjusting gasket to play a role of a cam, so that the inner and outer inclination angles are adjusted and the height of the left and right wheels is finely adjusted;
the threaded rod can be provided with a threaded end eccentric gasket, the threaded end eccentric gasket can be optionally arranged, whether the threaded end eccentric gasket needs to be arranged or not is determined according to actual conditions, and when the threaded end eccentric gasket needs to be arranged, the first clamping groove is used for clamping the threaded end eccentric gasket, so that the threaded rod is sleeved with the first clamping groove and cannot rotate;
the staff can directly read the rotation angle of the adjusting shim through the dial, so as to judge the adjusting degree of the wheel.
Reducing rod and first draw-in groove cold-heading one shot forming have improved the intensity of screw rod, and the screw rod appears warping, inflation etc. and warp when having avoided independent cold-heading first draw-in groove.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a radial view of a screw portion of an eccentric error-proofing bolt according to an embodiment of the present invention.
3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 the 3 line 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3
Fig. 3 is an axial view of an adjusting shim of an eccentric error-proofing bolt according to an embodiment of the present invention.
Fig. 4 is a radial view of an adjusting shim of an eccentric error-proofing bolt according to an embodiment of the present invention.
Fig. 5 is a radial view of an eccentric error proof bolt according to an embodiment of the present invention.
In the figure:
1. a nut;
2. a polish rod; 2a, a spline;
3. a reducing rod;
4. a threaded rod; 4a, a first card slot; 4a1, first base; 4a2, first beveled edge; 4a3, second beveled edge; 4b, a second card slot; 4b1, second base; 4b2, third beveled edge; 4b3, fourth beveled edge;
5. adjusting the gasket; 5a, a through hole; 5b, a dial.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, the eccentric error-proofing bolt comprises a nut 1, a polish rod 2, a reducing rod 3, a threaded rod 4 and an adjusting shim 5;
the nut 1, the polished rod 2, the reducing rod 3 and the threaded rod 4 are coaxial and are connected in sequence, and the nut 1, the polished rod 2, the reducing rod 3 and the threaded rod 4 are an integrated piece;
the adjusting gasket 5 is eccentrically sleeved at one end of the polished rod 2 close to the nut 1, and the adjusting gasket 5 is in interference fit with the polished rod 2;
the outer diameter of the polished rod 2 is larger than that of the threaded rod 4, and the outer diameter of the threaded rod 4 is larger than that of the reducing rod 3;
the outer periphery of threaded rod 4 is provided with radial sunken first draw-in groove 4a, and first draw-in groove 4a is the rectangular shape that is on a parallel with the threaded rod 4 axis, and reducing rod 3 and first draw-in groove 4a are cold forging one shot forming.
The nut 1 is used as a screw head, the polished rod 2, the reducing rod 3 and the threaded rod 4 are combined into a screw, and the adjusting gasket 5 is used for adjusting and adjusting the inner and outer inclination angles and the heights of the left wheel and the right wheel;
the threaded rod 4 can be provided with a threaded end eccentric gasket, the threaded end eccentric gasket can be optionally arranged, whether the threaded end eccentric gasket needs to be arranged or not is determined according to actual conditions, and when the threaded end eccentric gasket needs to be arranged, the first clamping groove 4a is used for clamping the threaded end eccentric gasket in a clamping mode, so that the threaded rod 4 is sleeved with the first clamping groove and cannot rotate;
the undergauge occupies apparent position in bolt cold-heading production, to reducing the deformation ratio of product, improves the stability of cold-heading, solves raw and other materials breach, improves bolt head pole bonding strength, prevents that the product from falling the head etc. and all playing an important role, and undergauge pole 3 and first draw-in groove 4a cold-heading one shot forming have improved the intensity of first draw-in groove 4a, and the screw rod appears warping, deformation such as inflation when having avoided independent cold-heading first draw-in groove 4 a.
The distance between the bottom end of the first clamping groove 4a and the axis of the threaded rod 4 is smaller than the distance between the bottom end of the thread of the threaded rod 4 and the axis of the threaded rod 4.
The hardness of the bottom end of the first clamping groove 4a after cold forging is larger than that of the circumferential surface of the threaded rod 4, the bottom end of the first clamping groove 4a is lower than threads of the threaded rod 4, so that the threaded rod 4 is not influenced by the first clamping groove 4a when the threads are machined, the machining process of the threads is an extrusion thread rolling process, and the threads can be completely stressed when the nut is installed.
The projection of the first clamping groove 4a along the axial direction of the threaded rod 4 comprises a first bottom edge 4a1, a first oblique edge 4a2 and a second oblique edge 4a3, the first oblique edge 4a2 and the second oblique edge 4a3 are respectively positioned at two sides of the first bottom edge 4a1, the first oblique edge 4a2 and the second oblique edge 4a3 are respectively connected with two ends of the first bottom edge 4a1, and the first oblique edge 4a2, the first bottom edge 4a1 and the second oblique edge 4a3 are connected in a smooth transition mode; the first clamping groove 4a is symmetrical relative to a radial plane of the threaded rod 4, the first bottom edge 4a1 is parallel to a tangent of a projection in the axial direction of the threaded rod 4, the distance between the first bottom edge 4a1 and the axis of the threaded rod 4 is smaller than that between the bottom end of the thread of the threaded rod 4 and the axis of the threaded rod, and the included angle between the first oblique edge 4a2 and the second oblique edge 4a3 is 108-113 degrees.
The first clamping groove 4a is in an isosceles trapezoid shape, the upper bottom of the isosceles trapezoid shape faces the axis of the threaded rod 4, the included angle between the waist of the isosceles trapezoid shape is 108-113 degrees, and the clamping groove in the isosceles trapezoid shape is easy to be formed in a cold forging mode at one time and does not generate redundant deformation.
A second clamping groove 4b is arranged on the threaded rod 4 at a position symmetrical to the first clamping groove 4a relative to the axis of the threaded rod 4, the projection of the second clamping groove 4b along the axial direction of the threaded rod 4 comprises a second bottom edge 4b1, a third oblique edge 4b2 and a fourth oblique edge 4b3, the third oblique edge 4b2 and the fourth oblique edge 4b3 are respectively positioned at two sides of the second bottom edge 4b1, the third oblique edge 4b2 and the fourth oblique edge 4b3 are respectively connected with two ends of the second bottom edge 4b1, and the third oblique edge 4b2, the second bottom edge 4b1 and the fourth oblique edge 4b3 are connected in a smooth transition manner; the second clamping groove 4b is symmetrical relative to the radial plane of the threaded rod 4, the second bottom edge 4b1 is parallel to the tangent of the projection in the axial direction of the threaded rod 4, the distance between the second bottom edge 4b1 and the axis of the threaded rod 4 is equal to the distance between the first bottom edge 4a1 and the axis of the threaded rod 4, and the included angle between the third oblique edge 4b2 and the fourth oblique edge 4b3 is 85-90 degrees.
The second clamping groove 4b is in an isosceles trapezoid shape, the upper bottom of the isosceles trapezoid shape faces the axis of the threaded rod 4, the included angle between the trapezoid waists is 85-90 degrees, and the clamping groove in the isosceles trapezoid shape is easy to be formed in a one-time cold forging mode and does not generate redundant deformation;
the first clamping groove 4a and the second clamping groove 4b work together to better clamp the threaded end eccentric gasket sleeved on the threaded rod 4, and slight differences exist between the specifications of the first clamping groove 4a and the second clamping groove 4b to effectively reduce stress concentration.
One end of the polished rod 2 close to the nut 1 is provided with a spline 2a, the spline 2a is in a gear ring shape, an adjusting gasket 5 is in interference fit with the spline 2a, and the axial length of the spline 2a is equal to the thickness of the adjusting gasket 5.
The adjusting shim 5 is in a disc shape, a through hole 5a which is parallel to the axis direction of the adjusting shim 5 and penetrates through the adjusting shim 5 is formed in the adjusting shim 5, the through hole 5a is in interference fit with the spline 2a, the through hole 5a is eccentrically arranged relative to the adjusting shim 5, and the circumference of the through hole 5a is intersected with the axis of the adjusting shim 5.
The adjusting shim 5 is fixedly connected with the polished rod 2 through the through hole 5a, and the through hole 5a is eccentrically arranged, so that the adjusting shim 5 plays a role of a cam in the rotating process of the bolt, and the inner and outer inclination angles and the height of the left and right wheels can be adjusted and adjusted.
The dial 5b is provided on the disc surface of the adjustment shim 5, and the dial 5b is provided on the side away from the through hole 5 a.
The dial 5b is composed of a plurality of strip-shaped grooves distributed at equal intervals around the axis of the adjusting shim 5, the strip-shaped grooves are combined into a sector, and a worker can directly read the rotating angle of the adjusting shim 5 through the dial 5b so as to judge the adjusting degree of the wheel.
The utility model discloses a theory of operation:
the nut 1, the polished rod 2, the reducing rod 3 and the threaded rod 4 are combined into an outer hexagon bolt, the adjusting gasket 5 is fixedly connected with the polished rod 2 through a press riveting process, and a worker rotates the polished rod 2 to enable the adjusting gasket 5 to play a role of a cam, so that the inner and outer inclination angles and the left and right wheel heights are adjusted and adjusted;
the threaded rod 4 can be provided with a threaded end eccentric gasket, the threaded end eccentric gasket can be optionally arranged, whether the threaded end eccentric gasket needs to be arranged or not is determined according to actual conditions, and when the threaded end eccentric gasket needs to be arranged, the first clamping groove 4a is used for clamping the threaded end eccentric gasket in a clamping mode, so that the threaded rod 4 is sleeved with the first clamping groove and cannot rotate;
the worker can directly read the rotation angle of the adjustment shim 5 through the dial 5b to judge the degree of adjustment of the wheel.
It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.
Claims (7)
1. An eccentric mistake-proofing bolt is characterized by comprising a nut (1), a polished rod (2), a reducing rod (3), a threaded rod (4) and an adjusting gasket (5);
the nut (1), the polished rod (2), the reducing rod (3) and the threaded rod (4) are coaxial and are sequentially connected, and the nut (1), the polished rod (2), the reducing rod (3) and the threaded rod (4) are an integrated piece;
the adjusting gasket (5) is eccentrically sleeved at one end of the polished rod (2) close to the nut (1), and the adjusting gasket (5) is in interference fit with the polished rod (2);
the outer diameter of the polished rod (2) is larger than that of the threaded rod (4), and the outer diameter of the threaded rod (4) is larger than that of the reducing rod (3);
the outer periphery of the threaded rod (4) is provided with a first clamping groove (4 a) which is radially sunken, the first clamping groove (4 a) is in a long strip shape which is parallel to the axis of the threaded rod (4), and the reducing rod (3) and the first clamping groove (4 a) are formed in one step through cold forging.
2. An eccentric error-proofing bolt according to claim 1, characterized in that the distance between the bottom end of the first locking groove (4 a) and the axis of the threaded rod (4) is smaller than the distance between the bottom end of the thread of the threaded rod (4) and the axis of the threaded rod (4).
3. An eccentric error-proofing bolt according to claim 2, characterized in that the projection of the first slot (4 a) along the axial direction of the threaded shaft (4) comprises a first bottom edge (4 a 1), a first oblique edge (4 a 2) and a second oblique edge (4 a 3), the first oblique edge (4 a 2) and the second oblique edge (4 a 3) are respectively located at two sides of the first bottom edge (4 a 1), the first oblique edge (4 a 2) and the second oblique edge (4 a 3) are respectively connected with two ends of the first bottom edge (4 a 1), and the connection between the first oblique edge (4 a 2), the first bottom edge (4 a 1) and the second oblique edge (4 a 3) is smooth; the first clamping groove (4 a) is symmetrical relative to a radial plane of the threaded rod (4), the first bottom edge (4 a 1) is parallel to a tangent of a projection in the axial direction of the threaded rod (4), the distance between the first bottom edge (4 a 1) and the axis of the threaded rod (4) is smaller than the distance between the bottom end of a thread of the threaded rod (4) and the axis of the threaded rod, and the included angle between the first oblique edge (4 a 2) and the second oblique edge (4 a 3) is 108-113 degrees.
4. An eccentric error-proofing bolt according to claim 3, characterized in that a second slot (4 b) is provided on the threaded rod (4) at a position symmetrical to the first slot (4 a) with respect to the axis of the threaded rod (4), the projection of the second slot (4 b) along the axial direction of the threaded rod (4) comprises a second bottom edge (4 b 1), a third oblique edge (4 b 2) and a fourth oblique edge (4 b 3), the third oblique edge (4 b 2) and the fourth oblique edge (4 b 3) are respectively located at two sides of the second bottom edge (4 b 1) and the third oblique edge (4 b 2) and the fourth oblique edge (4 b 3) are respectively connected with two ends of the second bottom edge (4 b 1), and the connection between the third oblique edge (4 b 2), the second bottom edge (4 b 1) and the fourth oblique edge (4 b 3) is smoothly transited; the second clamping groove (4 b) is symmetrical relative to a radial plane of the threaded rod (4), the second bottom edge (4 b 1) is parallel to a tangent of a projection in the axial direction of the threaded rod (4), the distance between the second bottom edge (4 b 1) and the axis of the threaded rod (4) is equal to the distance between the first bottom edge (4 a 1) and the axis of the threaded rod (4), and the included angle between the third oblique edge (4 b 2) and the fourth oblique edge (4 b 3) is 85-90 degrees.
5. An eccentric error-proofing bolt according to claim 1, characterized in that the end of the polish rod (2) close to the nut (1) is provided with a spline (2 a), the spline (2 a) is in the shape of a ring gear, the adjusting shim (5) and the spline (2 a) are in interference fit, and the axial length of the spline (2 a) is equal to the thickness of the adjusting shim (5).
6. The eccentric mistake proofing bolt of claim 5, wherein the adjusting shim (5) is in a disc shape, a through hole (5 a) which is parallel to the axial direction of the adjusting shim (5) and penetrates through the adjusting shim (5) is formed in the adjusting shim (5), the through hole (5 a) is in interference fit with the spline (2 a), the through hole (5 a) is eccentrically arranged relative to the adjusting shim (5), and the circumference of the through hole (5 a) is intersected with the axial line of the adjusting shim (5).
7. An eccentric error-proofing bolt according to claim 6, characterized in that the adjusting washer (5) is provided with a dial (5 b) on its disc surface, the dial (5 b) being arranged on the side remote from the through hole (5 a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921193046.4U CN210565622U (en) | 2019-07-26 | 2019-07-26 | Eccentric error-proof bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921193046.4U CN210565622U (en) | 2019-07-26 | 2019-07-26 | Eccentric error-proof bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210565622U true CN210565622U (en) | 2020-05-19 |
Family
ID=70636113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921193046.4U Active CN210565622U (en) | 2019-07-26 | 2019-07-26 | Eccentric error-proof bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210565622U (en) |
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2019
- 2019-07-26 CN CN201921193046.4U patent/CN210565622U/en active Active
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