A kind of automobile electric tailgate support rod damper

Abstract

The utility model relates to the technical field of automobile electric support rods, and in particular to an automobile electric tailgate support rod damper; it comprises a shell, an end cover detachably connected to the shell, at least two fixed friction plates and at least one dynamic friction plate, the dynamic friction plate is arranged between two adjacent fixed friction plates, the outer peripheral surface of the fixed friction plate is circumferentially fixed to the inner peripheral surface of the shell, a first transmission member is installed in the shell with clearance matching, one end of the first transmission member is circumferentially fixed to the dynamic friction plate, and the other end is connected to the second transmission member, the outer periphery of the second transmission member is sleeved with a torsion spring through interference matching, one end of the torsion spring is circumferentially fixed to the first transmission member, and the second transmission member is transmission-connected to the rotating shaft of the automobile electric tailgate support rod; after the utility model improves the prior art, when the automobile tailgate is opened, the damping force is small and the lifting is fast, when the automobile tailgate is closed, the damping force is large and the descending is slow, so the closing is safer and more stable, and different damping forces can be automatically adapted when the automobile tailgate is opened and closed.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electric struts, in particular to an automobile electric tailgate strut damper. Background Art

[0002] When using a vehicle, it is often necessary to open or close the tailgate. Therefore, the vehicle is often equipped with an electric tailgate pull rod to open or close the tailgate. Due to the huge size and weight of the tailgate, the pull rod is heavily loaded. During the opening and closing process, the center of gravity of the tailgate keeps changing, and the force on the pull rod is also constantly changing. The force on the pull rod is unbalanced, which not only makes the pull rod itself easily damaged, but also damages the tailgate, affecting the integrity of the vehicle. Therefore, a damper is installed in the tailgate pull rod to balance the load force between the door and the pull rod, also known as a brake.

[0003] For example, a Chinese patent document with the authorization number CN212429607U discloses a damper, including a hollow circular mounting body and a cover body, the cover body is provided with a through hole concentric with the mounting body, the mounting body is provided with an annular positioning boss, an elastic member and a damping assembly are provided between the cover body and the annular positioning boss, one end of the elastic member is in conflict with the cover body, the other end of the elastic member opposite to the end in conflict with the cover body is in conflict with the damping assembly, the damping assembly includes a plurality of annular damping plates and a plurality of annular gaskets, the plurality of gaskets and the plurality of damping plates are alternately arranged between the annular positioning boss and the elastic member, and an annular friction plate is provided between the damping plate and the gasket; the cover body in the mounting body applies pressure to the spring, and then the spring applies pressure to the gasket, friction plate and damping plate, and when the damping plate is connected to the spline portion of the rotating connecting rod, a damping effect is achieved. However, when the tailgate of the car is opened and closed, the damping force is the same, and different damping forces cannot be automatically adapted according to the opening or closing scene.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a car electric tailgate strut damper in view of the above-mentioned deficiencies in the prior art, so as to solve the problem in the prior art that the car tailgate cannot automatically adapt to different damping forces according to the opening or closing scene when opening and closing.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automobile electric tailgate strut damper, comprising a shell, an end cover detachably connected to the shell, at least two fixed friction plates and at least one dynamic friction plate, wherein the dynamic friction plate is arranged between two adjacent fixed friction plates, the outer circumferential surface of the fixed friction plate is circumferentially fixedly connected to the inner circumferential surface of the shell, a first transmission member is installed in the shell with a clearance fit, one end of the first transmission member is circumferentially fixedly connected to the dynamic friction plate, and the other end is connected to the second transmission member, a torsion spring is provided in an interference fit sleeve on the outer circumference of the second transmission member, one end of the torsion spring is circumferentially fixedly connected to the first transmission member, and the second transmission member is drivingly connected to the rotating shaft of the automobile electric tailgate strut.

[0007] By adopting the above technical scheme, when the tailgate of the automobile is opened, the rotating shaft of the electric tailgate support rod of the automobile drives the second transmission member and the torsion spring to rotate, and the torsion spring drives the first transmission member to rotate, and the first transmission member is linked to the dynamic friction plate to rotate and the friction between the first transmission member and the fixed friction plate generates a damping force on the rotation of the first transmission member, and the first transmission member generates a reaction force on the torsion spring, so that the torsion spring is twisted with an increased inner diameter, so that the torsion spring and the second transmission member are no longer interfered with and locked, and relative rotation occurs, thereby reducing the damping force on the rotating shaft of the electric tailgate support rod; on the contrary, when the tailgate of the automobile is closed, the torsion spring and the second transmission member are interfered with and locked again, and the damping force generated by the rotation of the dynamic friction plate and the friction between the fixed friction plate is converted back; therefore, when the tailgate of the automobile is opened, the damping force is smaller and rises faster, and when the tailgate of the automobile is closed, the damping force is larger and descends slower, so the closing is safer and smoother, thereby realizing that the tailgate of the automobile can automatically adapt to different damping forces when opening and closing.

[0008] The above technical solution is further configured as follows: a clamping foot extending toward the periphery is provided at one end of the torsion spring, and a clamping groove adapted to the clamping foot is provided on the side wall of the first transmission member.

[0009] By adopting the above technical solution, the circumferential fixation is achieved by inserting the clamping foot at one end of the torsion spring into the clamping groove. When the second transmission member drives the torsion spring to rotate, the first transmission member can also be driven to rotate, thereby achieving linkage.

[0010] The above technical solution is further configured as follows: an annular limiting groove is provided inside one end of the first transmission member away from the slot, one end of the second transmission member is installed in the annular limiting groove with clearance fit, and an internal spline is provided at the center of the second transmission member.

[0011] By adopting the above technical solution, the second transmission member is driven to rotate by the external spline on the rotating shaft of the automobile electric tailgate support rod and the internal spline of the second transmission member, and one end of the second transmission member is limited by the annular limiting groove on the first transmission member so that it can rotate stably along the axis.

[0012] The above technical solution is further configured as follows: an outer circumferential surface of the first transmission member away from the clamping groove is provided with an external spline, and an inner circumferential surface of the dynamic friction plate is provided with an internal spline that cooperates with the external spline of the first transmission member.

[0013] By adopting the above technical solution, the first transmission member is connected to the dynamic friction plate through a spline transmission. When the first transmission member rotates, it drives the dynamic friction plate to rotate and rubs against the fixed friction plate to generate friction damping force.

[0014] The above technical solution is further configured as follows: a plurality of protrusions are provided on the outer periphery of the fixed friction plate, a groove matching the protrusions is provided on the inner wall of the shell, and the first transmission member is located on the outer peripheral side surface of one side of the external spline and abuts against the adjacent fixed friction plate.

[0015] By adopting the above technical solution, the fixed friction plate can be circumferentially fixed by snapping the protrusion of the fixed friction plate into the groove on the inner wall of the shell, and the fixed friction plate and the dynamic friction plate are pressed together by the end cover and the first transmission member to achieve axial limitation.

[0016] The above technical solution is further configured as follows: an elastic member is installed inside the end cover, one end of the elastic member abuts against the end cover, and the other end abuts against the adjacent fixed friction plate.

[0017] By adopting the above technical solution, by arranging an elastic member between the end cover and the adjacent fixed friction plate, it can play the role of buffering and shock absorption, cooperate with the damper to work, and adjust and control the preload force.

[0018] The above technical solution is further configured as follows: the elastic member is a spring, and a limiting groove adapted to one end of the spring is provided on a side of the end cover close to the spring.

[0019] By adopting the above technical solution, one end of the spring is limited by the limiting groove to avoid the axis misalignment during extrusion, which leads to uneven force on the fixed friction plate end.

[0020] The above technical solution is further configured as follows: an outer circumference of the end cover is provided with an external thread, an inner wall of the shell is provided with an internal thread adapted to the external thread, and a multi-angle avoidance hole is provided in the center of the end cover.

[0021] By adopting the above technical solution, the end cover and the shell are detachably connected through a threaded connection, which is convenient for disassembly and maintenance; the multi-angle avoidance holes make it convenient to screw and disassemble the end cover with the help of tools.

[0022] The above technical solution is further configured as follows: a bearing is also installed inside the end of the shell away from the end cover, a retaining ring is provided on the side of the bearing away from the end cover for clamping with the shell, and a retaining spring is provided on the other side for clamping with the rotating shaft of the electric tailgate support rod of the automobile, a washer is provided on the side of the retaining spring close to the end cover for abutting against it, an installation groove for limiting the position of the washer is provided on the end of the first transmission member close to the washer, and a retaining ring is also provided on the inner wall of the shell for abutting against the side of the bearing away from the retaining ring.

[0023] By adopting the above technical solution, the rotating shaft of the electric tailgate support rod of the automobile is positioned by the bearing, which can reduce friction loss and reduce shock and noise; the gasket installed in the installation groove can simultaneously limit the axial position of the retaining spring and the second transmission member at both ends.

[0024] The beneficial effects achieved by the utility model are: when the tailgate of the car is opened, the damping force is small and the rise is fast; when the tailgate of the car is closed, the damping force is large and the descending is slow, so the closing is safer and smoother, thereby realizing that the tailgate of the car can automatically adapt to different damping forces when opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0028] Figure 4 yes Figure 3 Partial view at A in the middle;

[0029] Figure 5 It is a structural schematic diagram of the first transmission member in the embodiment of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the housing in the embodiment of the utility model;

[0031] Figure 7 It is a schematic diagram of the structure of the end cover in the embodiment of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-7 As shown in, a car electric tailgate strut damper comprises a shell 1, an end cover 2 detachably connected to the shell 1, at least two fixed friction plates 3 and at least one dynamic friction plate 4, preferably three fixed friction plates 3, preferably two dynamic friction plates 4, the dynamic friction plate 4 is arranged between two adjacent fixed friction plates 3, the outer circumferential surface of the fixed friction plate 3 is circumferentially fixedly connected to the inner circumferential surface of the shell 1, a first transmission member 5 is installed in the shell 1 with clearance fit, one end of the first transmission member 5 is circumferentially fixedly connected to the dynamic friction plate 4, and the other end is connected to the second transmission member 6, the outer circumference of the second transmission member 6 is provided with a torsion spring 7 by an interference fit sleeve, one end of the torsion spring 7 is circumferentially fixedly connected to the first transmission member 5, the second transmission member 6 is transmission-connected to the rotating shaft A1 of the car electric tailgate strut, and one end of the torsion spring 7 is provided with a circumferentially extending outward. The first transmission member 5 has a protruding card foot 71, and a card slot 50 matched with the card foot 71 is provided on the side wall of the first transmission member 5. An annular limiting groove 51 is provided inside the end of the first transmission member 5 away from the card slot 50. One end of the second transmission member 6 is installed in the annular limiting groove 51 with clearance fit. An internal spline is provided at the center of the second transmission member 6. The second transmission member 6 is transmission-matched with the external spline of the rotating shaft A1 of the electric tailgate support rod of the automobile through the internal spline. The outer peripheral surface of the end of the first transmission member 5 away from the card slot 50 is provided with an external spline, and the inner peripheral surface of the dynamic friction plate 4 is provided with an internal spline matched with the external spline of the first transmission member 5. A plurality of protrusions 31 are provided on the outer periphery of the fixed friction plate 3. A groove 10 matched with the protrusion 31 is provided on the inner wall of the shell 1. The first transmission member 5 is located on the outer peripheral side of the external spline and abuts against the adjacent fixed friction plate 3.

[0034] An elastic member is installed on the inner side of the end cover 2, one end of the elastic member is in contact with the end cover 2, and the other end is in contact with the nearby fixed friction plate 3. The elastic member is preferably a spring 8, and other types of elastic members can also be used. Here, only the spring 8 is taken as an example for explanation. A limiting groove 21 adapted to one end of the spring 8 is provided on the side of the end cover 2 close to the spring 8, and an external thread is provided on the outer periphery of the end cover 2, and an internal thread adapted to the external thread is provided on the inner wall of the shell 1. A hexagonal avoidance hole 20 is provided in the center of the end cover 2, and the end cover 2 and the shell 1 are connected by threads for easy disassembly and assembly.

[0035] A bearing 9 is also installed inside the end of the shell 1 away from the end cover 2. A snap ring 91 that is clamped to the shell 1 is provided on the side of the bearing 9 away from the end cover 2, and a snap spring 92 that is clamped to the rotating shaft A1 of the electric tailgate support rod of the automobile is provided on the other side. A washer 93 that abuts against the snap spring 92 is provided on the side close to the end cover 2. An installation groove 52 for limiting the washer 93 is provided on the end of the first transmission member 5 close to the washer 93. A retaining ring 11 that can abut against the side of the bearing 9 away from the snap ring 91 is also provided on the inner wall of the shell 1. The rotating shaft A1 of the electric tailgate support rod of the automobile is positioned by the bearing 9, which can reduce friction loss and reduce shock and noise.

[0036] In the technical scheme of the above embodiment, when the tailgate of the automobile is opened, the rotating shaft A1 of the electric tailgate support rod of the automobile drives the second transmission member 6 and the torsion spring 7 to rotate, and the torsion spring 7 drives the first transmission member 5 to rotate through the clamping foot 71. The first transmission member 5 is linked with the dynamic friction plate 4 to rotate and the friction between the first transmission member 5 and the fixed friction plate 3 generates a damping force on the rotation of the first transmission member 5. The first transmission member 5 generates a reaction force on the torsion spring 7, so that the torsion spring 7 is twisted with an increased inner diameter, so that the torsion spring 7 and the second transmission member 6 are no longer interfered with and locked, and relative rotation occurs, thereby reducing the damping force on the rotating shaft A1 of the electric tailgate support rod; on the contrary, when the tailgate of the automobile is closed, the torsion spring 7 and the second transmission member 6 are interfered with and locked again, and the damping force generated by the rotation of the dynamic friction plate 4 and the friction between the fixed friction plate 3 is converted back; therefore, when the tailgate of the automobile is opened, the damping force is small and rises faster, and when the tailgate of the automobile is closed, the damping force is large and descends slowly, so that the closing is safer and smoother, thereby realizing that the tailgate of the automobile can automatically adapt to different damping forces when opening and closing.

Claims

1. An automotive electric tailgate strut damper, comprising a housing, an end cover detachably connected to the housing, at least two fixed friction plates and at least one dynamic friction plate, wherein the dynamic friction plate is arranged between two adjacent fixed friction plates, and the outer peripheral surface of the fixed friction plate is circumferentially fixedly connected to the inner peripheral surface of the housing, characterized in that: A first transmission member is installed in the shell with a clearance fit, one end of the first transmission member is circumferentially fixedly connected to the dynamic friction plate, and the other end is connected to the second transmission member, a torsion spring is provided in an interference fit sleeve on the outer circumference of the second transmission member, one end of the torsion spring is circumferentially fixedly connected to the first transmission member, and the second transmission member is transmission connected to the rotating shaft of the automobile electric tailgate support rod.

2. The automotive electric tailgate strut damper according to claim 1, characterized in that: One end of the torsion spring is provided with a clamping foot extending toward the periphery, and the side wall of the first transmission member is provided with a clamping groove adapted to the clamping foot.

3. The automotive electric tailgate strut damper according to claim 2, characterized in that: An annular limiting groove is provided inside one end of the first transmission member away from the clamping groove, one end of the second transmission member is installed in the annular limiting groove with clearance fit, and an internal spline is provided at the center of the second transmission member.

4. The automotive electric tailgate strut damper according to claim 3, characterized in that: An outer circumferential surface of the first transmission member at one end away from the clamping groove is provided with an external spline, and an inner circumferential surface of the dynamic friction plate is provided with an internal spline that matches the external spline of the first transmission member.

5. The automotive electric tailgate strut damper according to claim 4, characterized in that: The outer periphery of the fixed friction plate is provided with a plurality of protrusions, the inner wall of the housing is provided with grooves adapted to the protrusions, and the first transmission member is located on the outer peripheral side surface of one side of the external spline and abuts against the adjacent fixed friction plate.

6. The automotive electric tailgate strut damper according to any one of claims 1 to 5, characterized in that: An elastic member is installed inside the end cover, one end of the elastic member abuts against the end cover, and the other end abuts against the adjacent fixed friction plate.

7. The automotive electric tailgate strut damper according to claim 6, characterized in that: The elastic member is a spring, and a limiting groove adapted to one end of the spring is provided on a side of the end cover close to the spring.

8. The automotive electric tailgate strut damper according to claim 7, characterized in that: The outer periphery of the end cover is provided with an external thread, the inner wall of the shell is provided with an internal thread adapted to the external thread, and the center of the end cover is provided with a multi-angle avoidance hole.

9. The automotive electric tailgate strut damper according to claim 8, characterized in that: A bearing is also installed inside the end of the shell away from the end cover, a retaining ring is provided on the side of the bearing away from the end cover for clamping with the shell, and a retaining spring is provided on the other side for clamping with the rotating shaft of the electric tailgate support rod of the automobile, a washer is provided on the side of the retaining spring close to the end cover for abutting against it, an installation groove for limiting the washer is provided on the end of the first transmission member close to the washer, and a retaining ring is also provided on the inner wall of the shell for abutting against the side of the bearing away from the retaining ring.

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