Axial damper and power tailgate mechanical strut

Abstract

The application relates to the technical field of automobile parts, and discloses an axial damper and an electric tail door mechanical supporting rod, the axial damper comprising a sleeve, a compression spring, a first limiting piece and a damping unit, the damping unit comprising an inner pressing piece and an outer pressing piece, the device is provided with a preset pressure of the compression spring, the inner periphery of the second extension part of the outer pressing piece is pressed against the outer periphery of the first extension part of the inner pressing piece, the first extension part of the inner pressing piece is further tightened inward, friction force is generated on the outer periphery of the piston rod, and the energy generated when the piston rod slides relative to the cylinder sleeve is consumed; the device can adjust the size of the preset damping by adjusting the preset pressure of the compression spring; and since the gap is arranged on the first extension part, when the first extension part and the piston rod are worn, the pressure generated by the compression spring can cause the inner pressing piece to further slide relative to the outer pressing piece, so that the worn part of the inner pressing piece is supplemented, and the stability of the damping effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to an axial damper and a mechanical strut for an electric tailgate. Background Technology

[0002] A damper is a device that provides resistance to motion and reduces the energy of motion. There are three main types: liquid dampers, gas dampers, and electromagnetic dampers.

[0003] The electric tailgate strut system for automobiles includes electric struts and mechanical struts. Generally, electric struts contain a motor, a gearbox, and a damping device to provide resistance and create a damping effect. Mechanical struts, on the other hand, do not contain a motor or gearbox. In practical applications, the damping of the mechanical strut needs to be matched with that of the electric strut to ensure that their movements are synchronized. This prevents tailgate deformation caused by asynchronous movement speeds and inconsistent stroke changes during opening and closing.

[0004] However, since the current electric tailgate support rods mainly use compressed gas as damping or use undamped structures to achieve synchronization, they are affected by different working conditions such as sealing degree, temperature, humidity, and air pressure, resulting in problems such as non-linear changes in the extension and retraction stroke of the mechanical rod, unstable damping effect, large damping attenuation, and difficulty in preset the damping force. Summary of the Invention

[0005] The purpose of this invention is to provide an axial damper and an electric tailgate mechanical strut, which not only facilitates the preset damping magnitude but also provides a stable damping effect, ensuring that the extension and retraction stroke of the mechanical strut changes linearly.

[0006] To achieve the above objectives, the present invention provides an axial damper, comprising: a sleeve and a compression spring, a first limiting member, and a damping unit disposed inside the sleeve;

[0007] The sleeve has a protruding edge extending inward along the inner circumferential surface of the sleeve.

[0008] The first limiting member is installed on the sleeve and is spaced apart from the protruding edge;

[0009] The compression spring is disposed between the protruding edge and the first limiting member;

[0010] The damping unit is disposed between the compression spring and the flange or between the compression spring and the first limiting member, and the damping unit includes an inner pressure member and an outer pressure member;

[0011] The inner pressure member includes a first abutting part and a first extension part. The first abutting part is cylindrical. The first extension part is located at one end of the first abutting part and extends inwardly along the outer peripheral surface of the first abutting part. A gap is provided on the first extension part. The gap passes through one end of the first extension part away from the first abutting part along the extension direction of the first extension part.

[0012] The external pressure member includes a second abutment portion and a second extension portion. The second abutment portion is cylindrical. The second extension portion is located at one end of the second abutment portion and extends outward at an incline along the inner circumferential surface of the second abutment portion. The second extension portion is sleeved on the first extension portion, and the second extension portion and the first extension portion can slide towards each other. One end of the compression spring abuts against the first abutment portion or the second abutment portion, and the other end abuts against the protrusion or the first limiting member.

[0013] Preferably, the first limiting member includes a bushing, the outer circumferential surface of the bushing is provided with an external thread, the inner circumferential surface of the sleeve is provided with an internal thread, the bushing is threadedly connected to the sleeve, and one end of the bushing opposite to the convex edge protrudes from the sleeve. By adjusting the threaded connection relationship between the bushing and the sleeve, the preset pressure of the compression spring can be adjusted, thereby adjusting the preset damping magnitude.

[0014] Preferably, the device includes multiple damping units, which are disposed between the compression spring and the flange and / or between the compression spring and the first limiting member. The damping magnitude can be adjusted by adjusting the number of damping units.

[0015] Preferably, it also includes a top sleeve, which is disposed inside the sleeve and located between the convex edge and the compression spring. By cutting the top sleeve to different lengths, the spatial difference of different numbers of damping units can be compensated, thereby ensuring that the total length of the axial damper remains unchanged, enhancing the universality of the sleeve of the axial damper, and eliminating the need to set different lengths of the sleeve for different specifications.

[0016] Preferably, the first extension includes a plurality of the slots, and the plurality of slots are spaced apart circumferentially along the first extension. By providing a plurality of slots, the contraction range of the first extension is enhanced, thereby matching different degrees of wear.

[0017] Preferably, the end of the first abutting portion opposite to the first extension portion is further provided with a boss extending outward along the outer periphery of the first abutting portion, so as to increase the contact area when the compression spring abuts with the first abutting portion and prevent the compression spring from falling off.

[0018] Preferably, the outer pressure member further includes a third extension portion, which is disposed on one end of the second extension portion away from the second abutment portion and extends along the outer periphery of the second extension portion towards the length direction of the sleeve. The third extension portion is fitted onto the first abutment portion, and the third extension portion and the first abutment portion can slide relative to each other to enhance the fit between the outer pressure member and the inner pressure member and to prevent the outer pressure member and the inner pressure member from separating from each other.

[0019] To achieve the same objective, the present invention also provides an electric tailgate mechanical strut, comprising: a cylinder liner, a piston rod, a second limiting member, and an axial damper as described above. The axial damper is installed at one end of the cylinder liner, and one end of the piston rod passes through the damping unit into the cylinder liner. The piston rod is slidably connected to the inner pressure member. The second limiting member is disposed on one end of the piston rod located in the cylinder liner to restrict the piston rod from sliding out of the cylinder liner.

[0020] Preferably, the cylinder liner and the sleeve are integrally formed to ensure the connection strength between the cylinder liner and the sleeve.

[0021] Compared with the prior art, the axial damper and electric tailgate mechanical strut of this invention have the following advantages: The device, through the preset pressure of the compression spring, causes a tendency for relative displacement between the inner and outer pressure components. The inner circumferential surface of the second extension of the outer pressure component presses against the outer circumferential surface of the first extension of the inner pressure component, causing the first extension of the inner pressure component to tighten inward, generating friction on the outer circumferential surface of the piston rod to dissipate the energy generated when the piston rod slides relative to the cylinder liner. The device can adjust the preset damping magnitude by adjusting the preset pressure of the compression spring. Furthermore, because a gap is provided on the first extension, when wear occurs between the first extension and the piston rod, the pressure generated by the compression spring causes the inner pressure component to slide further relative to the outer pressure component, compensating for the worn portion of the inner pressure component, thereby ensuring the stability of the damping effect and allowing the extension and retraction stroke of the mechanical strut to change linearly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of the axial damper according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure of the internal pressure component according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the external pressure component according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the electric tailgate mechanical support rod according to an embodiment of the present invention.

[0026] In the figure, 1 is the axial damper; 11 is the sleeve; 111 is the flange; 12 is the compression spring; 13 is the bushing; 14 is the damping unit; 141 is the inner pressure member; 1411 is the first abutment part; 14111 is the boss; 1412 is the first extension part; 14121 is the gap; 142 is the outer pressure member; 1421 is the second abutment part; 1422 is the second extension part; 1423 is the third extension part; 15 is the top cylinder; 2 is the cylinder liner; 3 is the piston rod; and 4 is the second limiting member. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0028] In this invention, the terms "inner" and "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] like Figure 1 - Figure 3 As shown, an axial damper 1 according to a preferred embodiment of the present invention includes: a sleeve 11 and a compression spring 12, a first limiting member (not shown in the figure), and a damping unit 14 disposed inside the sleeve 11;

[0031] The sleeve 11 has a protruding edge 111 extending inward along the inner circumferential surface of the sleeve 11;

[0032] The first limiting member is installed on the sleeve 11 and is spaced apart from the protruding edge 111;

[0033] The compression spring 12 is disposed between the protruding edge 111 and the first limiting member;

[0034] The damping unit 14 is disposed between the compression spring 12 and the protrusion 111 or between the compression spring 12 and the first limiting member. The damping unit 14 includes an inner pressure member 141 and an outer pressure member 142.

[0035] The inner pressure member 141 includes a first abutting part 1411 and a first extension part 1412. The first abutting part 1411 is cylindrical. The first extension part 1412 is disposed at one end of the first abutting part 1411 and extends inwardly at an angle along the outer peripheral surface of the first abutting part 1411. A gap 14121 is provided on the first extension part 1412. The gap 14121 passes through one end of the first extension part 1412 away from the first abutting part 1411 along the extension direction of the first extension part 1412.

[0036] The external pressure member 142 includes a second abutment portion 1421 and a second extension portion 1422. The second abutment portion 1421 is cylindrical. The second extension portion 1422 is disposed at one end of the second abutment portion 1421 and extends outward at an incline along the inner circumferential surface of the second abutment portion 1421. The second extension portion 1422 is sleeved on the first extension portion 1412, and the second extension portion 1422 and the first extension portion 1412 can slide towards each other. One end of the compression spring 12 abuts against the first abutment portion 1411 or the second abutment portion 1421, and the other end abuts against the protrusion 111 or the first limiting member.

[0037] Based on the above scheme, the device uses the preset pressure of the compression spring 12 to cause a relative displacement tendency between the inner pressure member 141 and the outer pressure member 142. The inner circumferential surface of the second extension 1422 of the outer pressure member 142 will press against the outer circumferential surface of the first extension 1412 of the inner pressure member 141, thereby causing the first extension 1412 of the inner pressure member 141 to tighten inward and generate friction on the outer circumferential surface of the piston rod 3 to consume the energy generated when the piston rod 3 slides relative to the cylinder liner 2. The device can adjust the preset damping magnitude by adjusting the preset pressure of the compression spring 12. Furthermore, since a gap is provided on the first extension 1412, when the first extension 1412 and the piston rod 3 are worn, the pressure generated by the compression spring 12 will cause the inner pressure member 141 to slide further relative to the outer pressure member 142 to compensate for the worn part of the inner pressure member 141, thereby ensuring the stability of the damping effect and enabling the extension stroke of the mechanical strut to change linearly.

[0038] like Figure 1 As shown, in order to facilitate the adjustment of the preset damping value, the first limiting member includes a bushing 13. The outer circumferential surface of the bushing 13 is provided with an external thread, and the inner circumferential surface of the sleeve 11 is provided with an internal thread. The bushing 13 is threadedly connected to the sleeve 11, and one end of the bushing 13 that is away from the convex edge 111 protrudes from the sleeve 11. By adjusting the threaded connection relationship between the bushing 13 and the sleeve 11, the preset pressure of the compression spring 12 can be adjusted, thereby adjusting the preset damping value.

[0039] like Figure 1As shown, in order to facilitate the adjustment of the preset damping size, two damping units 14 are included. The two damping units 14 are located between the compression spring 12 and the protrusion 111 and between the compression spring 12 and the first limiting member. The damping size can be adjusted by adjusting the number of damping units 14.

[0040] like Figure 1 As shown, in order to enhance the versatility of the axial damper 1, a top cylinder 15 is also included. The top cylinder 15 is located inside the sleeve 11 and between the convex edge 111 and the compression spring 12. By cutting the top cylinder 15 to different lengths, the spatial difference of different numbers of damping units 14 can be compensated, thereby ensuring that the total length of the axial damper 1 remains unchanged, enhancing the versatility of the sleeve 11 of the axial damper 1, and eliminating the need to set different lengths of sleeve 11 for different specifications.

[0041] Optionally, the material of the inner pressure member 141 can be carbon fiber, copper or plastic. By adjusting the material of the inner pressure member 141, the friction coefficient of the first extension 1412 can be adjusted, thereby adjusting the preset damping size and enhancing the applicability of the axial damper 1.

[0042] like Figure 2 As shown, in order to enhance the contraction range of the first extension 1412, the first extension 1412 includes multiple slits 14121, and the multiple slits 14121 are arranged at intervals along the circumference of the first extension 1412. By providing multiple slits 14121, the contraction range of the first extension 1412 is enhanced, thereby matching different degrees of wear.

[0043] like Figure 2 As shown, in order to make the fit between the compression spring 12 and the first abutment 1411 more stable, the end of the first abutment 1411 away from the first extension 1412 is also provided with a boss 14111 extending outward along the outer periphery of the first abutment 1411, so as to increase the contact area when the compression spring 12 abuts the first abutment 1411 and avoid the compression spring 12 from falling off.

[0044] like Figure 3 As shown, in order to make the fit between the outer pressure member 142 and the inner pressure member 141 more stable, the outer pressure member 142 also includes a third extension 1423. The third extension 1423 is disposed on the second extension 1422 at one end away from the second abutment 1421 and extends along the outer periphery of the second extension 1422 towards the length direction of the sleeve 11. The third extension 1423 is fitted onto the first abutment 1411, and the third extension 1423 and the first abutment 1411 can slide relative to each other to enhance the fit between the outer pressure member 142 and the inner pressure member 141 and to prevent the outer pressure member 142 and the inner pressure member 141 from separating from each other.

[0045] like Figure 4As shown, a preferred embodiment of the present invention provides an electric tailgate mechanical strut, comprising: a cylinder liner 2, a piston rod 3, a second limiting member 4, and an axial damper 1 as described above. The axial damper 1 is installed at one end of the cylinder liner 2, and one end of the piston rod 3 passes through the damping unit 14 into the cylinder liner 2. The piston rod 3 is slidably connected to the inner pressure member 141. The second limiting member 4 is provided on one end of the piston rod 3 located in the cylinder liner 2, for limiting the piston rod 3 from sliding out of the cylinder liner 2. The second limiting member 4 includes a gasket, and a groove extending circumferentially along the piston rod 3 is provided on the piston rod 3, with the gasket installed in the groove.

[0046] like Figure 4 As shown, in order to enhance the connection strength between cylinder liner 2 and sleeve 11, cylinder liner 2 and sleeve 11 are integrally formed to ensure the connection strength between cylinder liner 2 and sleeve 11.

[0047] In summary, this embodiment of the invention provides an axial damper 1 and an electric tailgate mechanical strut. Through the preset pressure of the compression spring 12, a relative displacement tendency is generated between the inner pressure member 141 and the outer pressure member 142. The inner circumferential surface of the second extension 1422 of the outer pressure member 142 presses against the outer circumferential surface of the first extension 1412 of the inner pressure member 141, causing the first extension 1412 of the inner pressure member 141 to tighten inward, generating friction on the outer circumferential surface of the piston rod 3 to dissipate the energy generated when the piston rod 3 slides relative to the cylinder liner 2. This device can adjust the preset damping magnitude by adjusting the preset pressure of the compression spring 12. Furthermore, because a gap is provided on the first extension 1412, when wear occurs between the first extension 1412 and the piston rod 3, the pressure generated by the compression spring 12 causes the inner pressure member 141 to slide further relative to the outer pressure member 142 to compensate for the worn portion of the inner pressure member 141, thereby ensuring the stability of the damping effect and allowing the extension and retraction stroke of the mechanical strut to change linearly.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An axial damper, characterized in that, include: The sleeve and a compression spring, a first limiting member, and a damping unit disposed inside the sleeve; The sleeve has a protruding edge extending inward along the inner circumferential surface of the sleeve. The first limiting member is installed on the sleeve and is spaced apart from the protruding edge; The compression spring is disposed between the protruding edge and the first limiting member; The damping unit is disposed between the compression spring and the flange or between the compression spring and the first limiting member, and the damping unit includes an inner pressure member and an outer pressure member; The inner pressure member includes a first abutting part and a first extension part. The first abutting part is cylindrical. The first extension part is located at one end of the first abutting part and extends inwardly along the outer peripheral surface of the first abutting part. A gap is provided on the first extension part. The gap passes through one end of the first extension part away from the first abutting part along the extension direction of the first extension part. The external pressure member includes a second abutment portion and a second extension portion. The second abutment portion is cylindrical. The second extension portion is located at one end of the second abutment portion and extends outward at an angle along the inner circumferential surface of the second abutment portion. The second extension portion is sleeved on the first extension portion, and the second extension portion and the first extension portion can slide towards each other. One end of the compression spring abuts against the first abutment portion or the second abutment portion, and the other end abuts against the protrusion or the first limiting member. The first limiting member includes a bushing, the outer circumferential surface of the bushing is provided with an external thread, the inner circumferential surface of the sleeve is provided with an internal thread, the bushing is threadedly connected to the sleeve, and one end of the bushing opposite to the convex edge protrudes from the sleeve.

2. The axial damper according to claim 1, characterized in that, It includes a plurality of damping units, which are disposed between the compression spring and the flange and / or between the compression spring and the first limiting member.

3. The axial damper according to claim 2, characterized in that, It also includes a top cylinder, which is disposed inside the sleeve and located between the convex edge and the damping unit.

4. The axial damper according to claim 1, characterized in that, The first extension includes a plurality of the slits, and the plurality of slits are spaced apart circumferentially along the first extension.

5. The axial damper according to claim 1, characterized in that, The end of the first abutting portion opposite to the first extension portion is also provided with a boss extending outward along the outer periphery of the first abutting portion.

6. The axial damper according to claim 1, characterized in that, The external pressure member further includes a third extension, which is disposed on one end of the second extension away from the second abutment and extends along the outer periphery of the second extension toward the length direction of the sleeve. The third extension is fitted onto the first abutment, and the third extension and the first abutment can slide relative to each other.

7. A mechanical strut for an electric tailgate, characterized in that, include: The cylinder liner, piston rod, second limiting member, and axial damper as described in any one of claims 1-6, wherein the axial damper is installed at one end of the cylinder liner, one end of the piston rod passes through the damping unit into the cylinder liner, the piston rod is slidably connected to the inner pressure member, and the second limiting member is provided on the piston rod at one end located in the cylinder liner to restrict the piston rod from sliding out of the cylinder liner.

8. The electric tailgate mechanical support rod according to claim 7, characterized in that, The cylinder liner and the sleeve are integrally formed.

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