Hinge bushing and vehicle door hinge assembly

Abstract

The utility model provides a hinge bushing and a vehicle door hinge assembly. A hinge bushing is sleeved in a connecting hole of a connecting rod, the hinge bushing is used for sleeving a shaft pin used for connecting the connecting rod and an engine cover page of a vehicle door or a vehicle body page of a vehicle body, the hinge bushing comprises a base part and a conductive convex piece which are fixedly arranged, the base part is sleeved in the connecting hole, the outer wall of the base part is in contact with the connecting rod, and the conductive convex piece is arranged on the base part. The inner wall of the base part is in contact with the shaft pin, and the inner wall of the base part is used for being insulated and wear-resistant; wherein the conductive convex piece made of a conductive material radially penetrates through the base part from the outer wall of the base part; one end of the conductive convex piece is in contact with the shaft pin; and the other end of the connecting rod is directly contacted with the connecting rod, or the other end of the connecting rod is contacted with the connecting rod through the outer wall of the base part.

Description

Technical Field

[0001] The utility model belongs to the field of vehicle parts manufacturing, and in particular relates to a hinge bushing and a door hinge assembly. Background Art

[0002] In the hinge structure design of vehicle doors, the door and the body are generally connected by a pin shaft to achieve free rotation of the door part relative to the body part. At the same time, considering that the door and the body rotate many times during the life cycle of the vehicle, in order to avoid wear and abnormal noise between components, hinge bushings with better wear performance are generally added to the door hinges. They are generally made of insulating plastic. The hinge bushings are set between the axle pin and the door, or between the axle pin and the body, thereby reducing wear on the hinges.

[0003] At the same time, when manufacturing a vehicle, in order to increase the corrosion resistance of the vehicle body (ie, the "body in white"), the entire vehicle needs to be immersed in an electrophoretic tank for electrophoretic coating. At this time, the vehicle is mainly electrically connected between the body and the robotic arm, and the robotic arm controls the vehicle to be immersed in the electrophoretic tank to complete the electrophoretic coating. In order to also be able to perform the electrophoretic coating process on the doors, a good electrical connection is required between the body and the doors.

[0004] Among the existing mainstream solutions, the main choice is to make the main part of the hinge bushing from a conductive material, such as stainless steel or metal material, and then coat the side of the bushing close to the shaft pin with an insulating wear-resistant material, usually PTFE (polytetrafluoroethylene). However, due to the insulating properties of polytetrafluoroethylene, it is often necessary to add conductive material to PTFE to form a conductive PTFE composite material, which is then coated on the hinge bushing to make the hinge bushing conductive.

[0005] However, the problem is that during the painting process, the PTFE composite material layer coated on the hinge bushing will absorb the electrophoretic paint due to its own conductivity. Also, during the painting process, the vehicle door will be repeatedly opened and closed, which will cause the electrophoretic paint absorbed by the PTFE composite material layer on the hinge bushing to fall off during the repeated opening and closing process, generating dust, thereby reducing the spraying quality of the entire vehicle and affecting the manufacturing efficiency of the entire vehicle.

[0006] Therefore, the prior art needs to be improved urgently. Utility Model Content

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a hinge bushing and a door hinge assembly to solve the problem of dust generated by the existing hinge bushing falling off during repeated opening and closing.

[0008] In order to achieve the above-mentioned purpose, the first aspect of the present invention adopts the following technical solutions:

[0009] A hinge bushing is sleeved between an axle pin and a connecting hole of a connecting rod, wherein the axle pin is used to connect the connecting rod and a cover leaf of a door or a body leaf of a vehicle body, and the hinge bushing comprises a fixedly arranged base and a conductive protrusion.

[0010] The base is sleeved in the connecting hole, the outer wall of the base contacts the connecting rod, the inner wall contacts the shaft pin, and the inner wall of the base is configured to be insulating and wear-resistant; wherein,

[0011] The conductive protrusion made of conductive material radially penetrates the base from the outer wall of the base; one end of the conductive protrusion contacts the shaft pin;

[0012] The other end is in direct contact with the connecting rod, or the other end is in contact with the connecting rod through the outer wall of the base.

[0013] As an embodiment of the utility model, the base is made of a conductive material, and the inner wall of the base is coated with an insulating wear-resistant material;

[0014] Alternatively, the base is made of an insulating wear-resistant material, and the conductive protrusion is in direct contact with the connecting rod.

[0015] As an implementation manner of the utility model, it further comprises a folding portion, wherein the folding portion is circumferentially fixedly arranged on a side of the base away from the shaft pin.

[0016] As an implementation mode of the utility model, the conductive protrusions are provided in plurality, and the plurality of conductive protrusions are evenly arranged in the circumferential direction of the base.

[0017] As an implementation mode of the utility model, the base is provided with an axially penetrating through groove.

[0018] The second aspect of the utility model adopts the following technical solution: a vehicle door hinge assembly, comprising a cover page for fixing to a vehicle door, a vehicle body page for fixing to a vehicle body, a connecting rod for connecting the cover page and the vehicle body page, an axle pin and the hinge bushing of the first aspect above, wherein a connecting hole is provided on the connecting rod for accommodating the hinge bushing, the axle pin passes through the hinge bushing and is connected to the cover page or the vehicle body page, and one side of the hinge bushing is in contact with the axle pin, and the other side is in contact with the connecting rod.

[0019] As an embodiment of the utility model, the connecting rod includes a front connecting rod and a rear connecting rod that do not interfere with each other. The front connecting rod is arranged on the front side of the body page and is rotatably connected to the cover page through a pin shaft. The rear connecting rod is arranged on the rear side of the body page and is rotatably connected to the cover page through a pin shaft.

[0020] As an implementation mode of the present utility model, the vehicle body panel comprises a first portion and a second portion integrally arranged in the Y direction;

[0021] The first part is arranged at the front side of the second part, and the first part is connected to the front connecting rod through the shaft pin and the hinge bushing; the second part is connected to the rear connecting rod through the shaft pin and the hinge bushing.

[0022] As an embodiment of the utility model, the cover leaf includes a horizontal portion and a curved portion that are integrally arranged in the Y direction, the curved portion is arranged on the inner side of the horizontal portion, and the horizontal portion is used to be connected to the vehicle door; the curved portion is used to be connected to the front connecting rod and the rear connecting rod respectively, and the connection point between the curved portion and the rear connecting rod is arranged on the inner side of the connection point between the curved portion and the front connecting rod.

[0023] As an embodiment of the present utility model, the hinge bushing includes a fixedly arranged base, a conductive protrusion and a folding portion, wherein:

[0024] The base is accommodated in the connecting hole of the connecting rod;

[0025] The conductive protrusion radially penetrates the base from the outer wall of the base to directly or indirectly connect the connecting rod and the shaft pin;

[0026] The folded portion is fixed to the base and is circumferentially arranged outside the connecting hole and in contact with the connecting rod.

[0027] To sum up, compared with the prior art, the utility model includes at least one of the following beneficial technical effects: thus, by setting the base to be made of a conductive material, and coating the inner wall of the base with an insulating wear-resistant coating, and providing a plurality of conductive protrusions protruding toward the axis center on the base, so that one end of the conductive protrusion is in contact with the axle pin, and the other end passes through the inner wall of the base and contacts the outer wall of the base, the conductivity requirements of the hinge bushing can be well met, while avoiding the dust caused by the peeling of the electrophoretic paint due to the adsorption of insulating paint on the hinge bushing during the vehicle manufacturing process, thereby improving the spraying quality of the topcoat. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is an exploded view of a vehicle body door assembly provided by a specific embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of a vehicle body door assembly in an open state provided by a specific embodiment of the utility model;

[0031] Figure 3 It is a structural schematic diagram of a vehicle body door assembly in a closed state provided by a specific embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of a hinge bushing provided by a specific embodiment of the utility model;

[0033] Figure 5 It is a three-dimensional diagram of a vehicle body door assembly structure provided by a specific embodiment of the utility model;

[0034] Figure 6 It is a front view of a vehicle body door assembly structure provided by a specific embodiment of the utility model;

[0035] Figure 7 It is an AA cross-sectional view of a vehicle body door assembly provided by a specific embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 100, hinge bushing; 110, base; 111, insulating wear-resistant coating; 120, folding portion; 130, conductive protrusion; 140, through groove;

[0038] 200, body page; 210, first part; 220, second part; 230, stop bolt;

[0039] 300, cover leaf; 310, horizontal portion; 320, curved portion; 330, gas spring ball pin;

[0040] 401, connecting hole; 410, front connecting rod; 420, rear connecting rod;

[0041] 500, shaft pin;

[0042] 600, door; 700, body. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, in the absence of any contrary description, the terms "X direction", "front" and "rear" will be used with respect to the longitudinal direction of the vehicle body, the forward direction of the car is the front, and the backward direction is the rear; the terms "Y direction", "inside" and "outside" will be used with respect to the transverse direction of the vehicle body, close to the center of the car is the inside, and away from the center of the car is the outside; the terms "Z direction", "upper" and "lower" will be used with respect to the vertical direction of the vehicle body, the upper part of the car is the upper part, and the lower part of the car is the lower part.

[0044] It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present utility model. In addition, in the following embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

[0045] In order to ensure that the vehicle body and doors can be painted normally during vehicle manufacturing and painting, the hinge bushing is required to be conductive, so the PTFE layer of the bushing must also be conductive. Since PTFE itself is insulated, it is generally achieved by adding conductive materials to PTFE. However, due to the conductive properties of the PTFE layer, the paint (paint) during painting will also adhere to the surface of the conductive PTFE layer. And because the doors will be opened and closed repeatedly during the subsequent painting process, the paint attached to the PTFE surface will fall off and form dust.

[0046] To resolve this issue, refer to Figure 1-7 A specific embodiment of the utility model provides a hinge bushing and a vehicle door hinge assembly.

[0047] See also Figure 1-3, the figure shows an exploded view of a door hinge assembly, i.e., a structure for connecting a vehicle body and a door. It includes a vehicle body leaf 200, a cover leaf 300, a front link 410, a rear link 420, a plurality of axle pins 500, and a plurality of hinge bushings 100. The vehicle body leaf 200 is arranged roughly along the Y direction of the vehicle body, the front link 410 is arranged at the front side of the vehicle body leaf 200 (i.e., the vehicle forward direction), and the rear link 420 is arranged at the rear side of the vehicle body leaf 200 (i.e., the vehicle backward direction). One end of the front link 410 and the rear link 420 are respectively rotatably connected to the vehicle body leaf 200 of the vehicle body 700, and the other end is respectively rotatably connected to the cover leaf 300 of the door 600. The travel of the front link 410 and the rear link 420 do not interfere with each other.

[0048] The door 600 is fixedly connected to the cover page 300, the body 700 is fixedly connected to the body page 200, the body page 200 and the cover page 300 are connected by a connecting rod, and the connecting rod preferably includes a front connecting rod 410 and a rear connecting rod 420 to form a four-link connection with the body page 200 and the cover page 300. The connecting rod is connected to the body page 200 or the cover page 300 through an axle pin 500, and a connecting hole 401 is provided at the connection between the connecting rod and the body page 200 or the cover page 300, and the hinge bushing 100 is accommodated in the connecting hole 401 to reduce the loss of the axle pin 500 or the connecting rod. The hinge bushing 100 is arranged in a connecting hole 401 on the connecting rod connected to the body page 200 and / or the cover page 300, so that the axle pin 500 passes through the hinge bushing 100 to complete the connection between the connecting rod and the body page 200 or the cover page 300, thereby realizing that the cover page 300 can rotate relative to the body page 200.

[0049] Please continue reading Figure 1-3 The vehicle body sheet 200 includes a first portion 210 and a second portion 220 which are integrally arranged. The first portion 210 and the second portion 220 are not on the same horizontal plane, and the first portion 210 is arranged in front of the second portion 220 in the X direction. The connection point between the vehicle body sheet 200 and the front link 410 is arranged on the first portion 210, and the connection point between the vehicle body sheet 200 and the rear link 420 is arranged on the second portion 220.

[0050] The cover leaf 300 is arranged roughly along the Y direction of the vehicle, and includes an integrally arranged horizontal portion 310 and a curved portion 320. The horizontal portion 310 is arranged on the outside of the curved portion 320 (i.e., the side of the vehicle Y direction away from the center of the vehicle), and the curved portion 320 has a certain curvature, and the arc center is arranged below the horizontal portion 310. The connection points of the cover leaf 300 with the front link 410 and the rear link 420 are both arranged on the curved portion 320, and the connection point of the cover leaf 300 with the rear link 420 is arranged on the inner side of the connection point of the cover leaf 300 with the front link 410. The horizontal portion 310 is used to connect with the vehicle door 600.

[0051] A plurality of hinge bushings 100 are respectively arranged in the connection holes 401 corresponding to the connection between the connecting rod and the body page 200 or the hair cover page 300. The inner wall of the hinge bushing 100 is connected to the shaft pin 500, and the outer wall is in contact with the connecting rod. When it is necessary to connect the connecting rod and the body page 200 or the hair cover page 300, the hinge bushing 100 is arranged in the connection hole 401 of the connecting rod, and then the shaft pin 500 is passed through the hinge bushing 100 and the body page 200 or the hair cover page 300 to achieve the connection between the connecting rod and the body page 200 or the hair cover page 300.

[0052] See also Figure 4-7 The hinge bushing 100 includes a base 110, a folding portion 120 and a conductive protrusion 130. The base 110 is a ring-like structure, and the base 110 is provided with a hollow cavity for facilitating the passage of the shaft pin 500. The folding portion 120 is arranged on both sides of the base 110 and along the circumference of the base 110. The folding portion 120 is extended in a direction away from the axis of the base 110, that is, the folding portion 120 is arranged on the side of the base 110 away from the shaft pin 500. The base 110 can be accommodated in the connecting hole 401 on the connecting rod, and the folding portion 120 is used to contact with the surface of the connecting rod, so that the hinge bushing 100 can be well accommodated in the connecting hole 401 on the connecting rod. At the same time, due to the existence of the folding portion 120, the base 110 is prevented from falling off from the connecting hole 401, thereby realizing the limitation of the hinge bushing 100.

[0053] Of course, the folding portion 120 may be provided on only one side of the base 110 or not provided. The present invention does not impose any limitation on this, as long as the hinge bushing 100 can be accommodated in the connecting hole 401 on the connecting rod connected to the vehicle body page 200 or the cover page 300.

[0054] Please continue reading Figure 4 The base 110 is preferably made of a conductive material, such as a stainless steel material or a metal material. The inner wall of the base 110, that is, the side of the base 110 facing the shaft pin 500, is coated with an insulating wear-resistant coating 111, such as a PTFE coating made of PTFE (polytetrafluoroethylene). The PTFE coating does not contain any conductive material, so the PTFE coating is a wear-resistant insulating coating.

[0055] At the same time, the base 110 is provided with a conductive protrusion 130, which is integrally provided with the base 110 and protrudes from the outer wall of the base 110 to the inner wall, that is, the conductive protrusion 130 is provided along the radial direction of the base 110, that is, it is provided from the outer wall of the base 110 through the inner wall of the base 110 toward the axial direction of the base 110. There are multiple conductive protrusions 130, preferably three. Preferably, in Figure 4In the embodiment, three conductive protrusions 130 are arranged on the same radial plane and are evenly arranged on the circumference of the base. The conductive protrusions 130 are made of conductive material, preferably made of the same material as the base 110, such as stainless steel or metal. Of course, it can be understood that the multiple conductive protrusions 130 are not arranged on one plane of the base, and the utility model does not limit this.

[0056] The end of the conductive protrusion 130 away from the base 110 contacts the shaft pin 500, and the end of the conductive protrusion 130 in contact with the base 110 contacts the outer wall of the base 110. Since the base 110, the conductive protrusion 130 and the shaft pin 500 are all made of conductive materials, the conductive protrusion 130 contacts both the outer wall of the base 110 and the shaft pin 500, thereby completing the conductive connection between the base 110 and the shaft pin 500. Since the shaft pin 500 directly contacts one of the body page 200 or the cover page 300, and is indirectly connected to the connecting rod through the hinge bushing 100, specifically, the outer wall of the hinge bushing 100 contacts the connecting rod, and the conductive protrusion 130 of the hinge bushing 100 contacts the shaft pin 500, thereby completing the conductive connection between the connecting rod and the body page 200 or the cover page 300.

[0057] It can be understood that, unlike the prior art in which a conductive wear-resistant coating is coated on the base 110, the solution of the utility model only requires the insulating wear-resistant coating 111 to be coated on the inner wall of the base 110. The purpose of such a setting is that, on the one hand, the insulating wear-resistant coating 111 can make the contact surface of the hinge bushing 100 and the axle pin 500 have better wear resistance, thereby improving the service life of the axle pin 500; on the other hand, since the insulating wear-resistant coating 111 itself is an insulating material, during the preparation process of the vehicle, especially during the painting process of the vehicle, since the insulating wear-resistant coating 111 itself is non-conductive, it will naturally not absorb the electrophoretic paint, and there will be no problem of paint falling off during the subsequent use of the axle pin 500 and the hinge bushing 100.

[0058] Therefore, by setting the base 110 to be made of a conductive material, and coating the inner wall of the base 110 with an insulating wear-resistant coating 111, and providing a plurality of conductive protrusions 130 protruding toward the axis center on the base 110, so that one end of the conductive protrusion 130 contacts the axle pin 500, and the other end passes through the inner wall of the base 110 and contacts the outer wall of the base 110, the conductivity requirements of the hinge bushing 100 can be well met, while avoiding dust caused by the peeling of electrophoretic paint due to the adsorption of insulating paint on the hinge bushing 100 during the vehicle manufacturing process, thereby improving the spraying quality of the topcoat.

[0059] It can be understood that for the conductive protrusion 130, as long as one end thereof can be in electrical contact with the connecting rod corresponding to the outer wall of the vehicle body and the other end thereof can be in electrical contact with the axle pin 500, the present invention does not impose any limitation on its specific structure.

[0060] In a specific embodiment, the outer wall of the base 110 is made of a conductive material, and the conductive protrusion 130 is a solid conductive cone. In this case, a mounting hole is provided on the base 110 so that the conductive cone is embedded through the mounting hole from the outer wall of the base 110 toward the axis of the base 110, and the outer wall of the base 110 contacts the conductive cone to complete the conductive connection. It is naturally understood that in an alternative embodiment, the conductive protrusion 130 is a hollow cone.

[0061] In another alternative embodiment, the conductive protrusion 130 is a hollow annular cylindrical structure, one side of the conductive protrusion 130 contacts the outer wall of the base 110 to achieve conductive connection, and the other side contacts the shaft pin 500 to achieve conductive connection. The advantage of this arrangement is that the weight and material usage of the conductive protrusion 130 can be further reduced, thereby reducing costs.

[0062] In another alternative embodiment, the outer wall of the base 110 is non-conductive, that is, the entire base 110 is made of non-conductive material, or the base 110 is directly made of insulating wear-resistant material. The side of the conductive protrusion 130 close to the base 110 is fixed to the outer wall of the base 110, and is also in contact with the connecting rod in contact with the outer wall of the base 110 to achieve conductive connection, and the other side of the conductive protrusion 130 is in contact with the shaft pin 500 to achieve conductive connection.

[0063] It can also be understood that the present invention does not limit the manufacturing process of the conductive protrusion 130 and the base 110. In a specific embodiment, the conductive protrusion 130 and the base 110 are formed by welding. In another alternative embodiment, the conductive protrusion 130 and the base 110 are integrally formed, and the base 110 is preferably made of stainless steel. When manufacturing the conductive protrusion 130, PTFE is first coated on the inner wall of the base 110, and then an inward convex bump, i.e., the conductive protrusion 130, is formed on the base 110 by stamping or the like, and then the PTFE on the surface of the base 110 is scraped off to expose the metal layer, and the base 110 and the conductive protrusion are manufactured to ensure that the hinge is conductive after assembly.

[0064] It can also be understood that the vehicle door can be a vehicle door, such as a door located at the front passenger seat or the rear passengers that needs to be opened and closed when entering and exiting the vehicle, or it can be a tailgate of the vehicle, or it can be a front cover door of the vehicle, that is, in the scheme of the present invention, as long as there is a door that has a certain hinge with the vehicle body or is connected in a rotating manner, it can be considered as the "vehicle door" mentioned in the present invention.

[0065] Therefore, through the front connecting rod 410, the rear connecting rod 420, the body page 200 and the cover page 300, the body page 200 is fixedly connected to the body, and the cover page 300 is fixedly connected to the door, so that the door and the body form a four-link door closing structure, which can well realize the opening and closing of the door relative to the body.

[0066] Preferably, an axially arranged through groove 140 is provided on the base 110, so that the base 110 is not a complete closed-loop structure. The advantage of such a setting is that the base 110 can be adapted to different types of axle pins 500, thereby improving the adaptability of the product.

[0067] Preferably, a limiting hole is provided on the side of the second portion 220 of the vehicle body sheet 200 away from the first portion 210 for matching with the limiting bolt 230 to achieve installation positioning of the vehicle body sheet 200 and the vehicle body 700 and improve installation accuracy.

[0068] Preferably, a ball head hole is provided on a side of the horizontal portion 310 of the cover leaf 300 away from the curved portion 320 for matching with the gas spring ball head pin 330 to achieve better fixation with the vehicle door 600 .

[0069] The above is a detailed introduction to the scheme of the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

[0070] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0071] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0072] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

Claims

1. A hinge bushing, sleeved between an axle pin and a connecting hole of a connecting rod, wherein the axle pin is used to connect the connecting rod and a cover leaf of a door or a body leaf of a vehicle body, characterized in that: comprising a fixedly arranged base and a conductive protrusion, The base is sleeved in the connecting hole, the outer wall of the base contacts the connecting rod, the inner wall contacts the shaft pin, and the inner wall of the base is configured to be insulating and wear-resistant; in The conductive protrusion made of conductive material radially penetrates the base from the outer wall of the base; one end of the conductive protrusion contacts the shaft pin; The other end is in direct contact with the connecting rod, or the other end is in contact with the connecting rod through the outer wall of the base.

2. The hinge bushing according to claim 1, characterized in that: The base is made of a conductive material, and the inner wall of the base is coated with an insulating wear-resistant material; Alternatively, the base is made of an insulating wear-resistant material, and the conductive protrusion is in direct contact with the connecting rod.

3. The hinge bushing according to claim 1 or 2, characterized in that: It also includes a folding portion, which is circumferentially fixedly arranged on a side of the base away from the shaft pin.

4. The hinge bushing according to claim 1 or 2, characterized in that: There are a plurality of conductive protrusions, and the plurality of conductive protrusions are evenly arranged in the circumferential direction of the base.

5. The hinge bushing according to claim 1 or 2, characterized in that: The base is provided with a through groove which penetrates axially.

6. A vehicle door hinge assembly, characterized in that: It includes a cover page for fixing to a vehicle door, a vehicle body page for fixing to a vehicle body, a connecting rod for connecting the cover page and the vehicle body page, an axle pin and a hinge bushing as described in any one of claims 1 to 5, wherein a connecting hole is provided on the connecting rod for accommodating a hinge bushing, the axle pin passes through the hinge bushing to be connected to the cover page or the vehicle body page, and one side of the hinge bushing is in contact with the axle pin and the other side is in contact with the connecting rod.

7. A vehicle door hinge assembly according to claim 6, characterized in that: The connecting rod includes a front connecting rod and a rear connecting rod which do not interfere with each other. The front connecting rod is arranged at the front side of the vehicle body page and is rotatably connected to the hair cover page via a pin shaft. The rear connecting rod is arranged at the rear side of the vehicle body page and is rotatably connected to the hair cover page via a pin shaft.

8. A vehicle door hinge assembly according to claim 7, characterized in that: The vehicle body sheet comprises a first portion and a second portion which are integrally arranged in the Y direction; The first part is arranged at the front side of the second part, and the first part is connected to the front connecting rod through the shaft pin and the hinge bushing; the second part is connected to the rear connecting rod through the shaft pin and the hinge bushing.

9. The vehicle door hinge assembly according to claim 7, characterized in that: The cover leaf includes a horizontal portion and a curved portion which are integrally arranged in the Y direction, wherein the curved portion is arranged on the inner side of the horizontal portion, and the horizontal portion is used to be connected to the vehicle door; the curved portion is used to be connected to the front connecting rod and the rear connecting rod respectively, and the connection point between the curved portion and the rear connecting rod is arranged on the inner side of the connection point between the curved portion and the front connecting rod.

10. A vehicle door hinge assembly according to any one of claims 6 to 9, characterized in that: The hinge bushing comprises a fixed base, a conductive protrusion and a folding portion, wherein The base is accommodated in the connecting hole of the connecting rod; The conductive protrusion radially penetrates the base from the outer wall of the base to directly or indirectly connect the connecting rod and the shaft pin; The folded portion is fixed to the base and is circumferentially arranged outside the connecting hole and in contact with the connecting rod.

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