One-way damper, tail door electric supporting rod and vehicle

Abstract

The invention relates to a one-way damper, a tail door electric supporting rod and a vehicle. The one-way damper comprises a damper shell provided with a mounting cavity; a second fixing member; a one-way bearing; and a first fixing member. When the tail door electric supporting rod drives the one-way bearing to rotate reversely, the one-way bearing rotates relative to the first fixing piece and the second fixing piece and rubs against the first fixing piece and the second fixing piece to generate damping force so as to resist the gravity of the tail door electric supporting rod and the tail door. When the tail door electric supporting rod drives the one-way bearing to rotate forwards, the outer ring of the one-way bearing, the first fixing piece and the second fixing piece are relatively static. The tail door electric supporting rod comprises the one-way damper and the one-way damper, an execution mechanism; a transmission mechanism; the vehicle comprises the tail door electric supporting rod. Compared with the prior art, the tail door electric supporting rod has the advantages that large damping force can be provided, and the damping force of the tail door electric supporting rod can be adjusted.

Description

Technical Field

[0001] The present invention belongs to the technical field of dampers, and in particular relates to a one-way damper, a tailgate electric strut, and a vehicle. Background Art

[0002] In order to enable the tailgate of an existing vehicle to hover at various angles, a damper is generally added inside. Conventional dampers provide frictional forces with similar magnitudes and opposite directions during the opening and closing processes of the tailgate. With the development trend of the tailgate, the weight of the tailgate gradually increases and the center of gravity gradually moves backward. As a result, when the electric strut supports the tailgate, it is necessary to overcome both an increasingly large load resistance moment and the resistance generated by its own damper. Eventually, the tailgate cannot be supported, or the costs of the strut, tailgate, and vehicle body increase.

[0003] Most of the existing tailgate electric struts are non-detachable, and the products cannot be repaired and can only be replaced as a whole. Especially during the manufacturing process, if any component inside the electric strut has a problem, the entire product needs to be scrapped, which affects the product qualification rate and cost. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a one-way damper, a tailgate electric strut, and a vehicle.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The first aspect of the present invention provides a one-way damper installed on a tailgate electric strut, and the one-way damper includes:

[0007] A damper housing having an installation cavity;

[0008] A second fixing member fixedly installed in the installation cavity;

[0009] A one-way bearing, one end of which facing outward along the axial direction is in frictional contact with the second fixing member, and the inner ring of which is connected to the tailgate electric strut; and

[0010] A first fixing member located in the installation cavity and sleeved outside the one-way bearing;

[0011] Wherein, when the tailgate electric strut drives the one-way bearing to reverse, the one-way bearing rotates relative to the first fixing member and the second fixing member respectively and generates a damping force by friction to resist the gravity of the tailgate electric strut and the tailgate;

[0012] Wherein, when the tailgate electric strut drives the one-way bearing to rotate forward, the Outer ring of the one-way bearing is relatively stationary with respect to the first fixing member and the second fixing member.

[0013] Furthermore, it further includes:

[0014] A fastener that is screwed into the damper housing; and

[0015] An elastic member that is disposed between the first fixing member and the fastener;

[0016] Wherein, when the fastener is screwed into the damper housing, the elastic member is compressed to provide an axial thrust to the second fixing member and the first fixing member.

[0017] Furthermore, the first fixing member is provided with a plurality of first protrusions, and the installation cavity is provided with first recesses that cooperate with the first protrusions;

[0018] Wherein, when the inner and outer rings of the one-way bearing rotate simultaneously, the first protrusions and the first recesses form a first friction surface.

[0019] Furthermore, the outer surface of the first protrusion inclines circumferentially towards the first fixing member, and the first recess cooperates with the first protrusion.

[0020] Furthermore, the second fixing member is provided with second protrusions, and the installation cavity is provided with second recesses that cooperate with the second protrusions;

[0021] Wherein, when the inner and outer rings of the one-way bearing rotate simultaneously, the second protrusions and the second recesses form a second friction surface.

[0022] The second aspect of the present invention provides a tailgate electric strut, including:

[0023] A one-way damper as described in any one of claims 1 - 5;

[0024] An actuator mechanism, which includes an actuator sleeve and a reduction motor disposed inside the actuator sleeve;

[0025] A transmission mechanism, which has a transmission lead screw structure that is in transmission connection with the reduction motor and a moving sleeve that surrounds the transmission lead screw structure;

[0026] Wherein, the one-way damper is disposed inside the actuator mechanism, the transmission lead screw structure is connected to the inner ring of the one-way bearing, and the reduction motor drives the one-way bearing to rotate forward or outward through the transmission lead screw structure;

[0027] Wherein, the reduction motor drives the moving sleeve to stretch or expand axially through the transmission lead screw structure to meet the opening or closing of the tailgate.

[0028] Furthermore, the transmission mechanism further includes:

[0029] A fixed sleeve that abuts against the actuator sleeve, with a movable sleeve disposed inside the fixed sleeve and slidably connected to the fixed sleeve; and

[0030] A mechanical spring disposed inside the fixed sleeve, with one end of the mechanical spring fixedly connected to the fixed sleeve and the other end fixedly connected to the movable sleeve;

[0031] The transmission lead screw structure includes:

[0032] A transmission lead screw connected to the reduction motor; and

[0033] A transmission nut tube having a nut threadedly connected to the transmission lead screw, the transmission nut tube surrounding the transmission lead screw, with one end of the transmission nut tube abutting against the damper housing and the other end abutting against the movable sleeve;

[0034] Wherein, the reduction motor drives the transmission lead screw to rotate to drive the nut to move axially along the transmission nut tube and apply an axial thrust to the movable sleeve;

[0035] Wherein, the mechanical spring is in a compressed state.

[0036] Further, the actuator further includes:

[0037] An O-ring disposed at the connection between the one-way damper and the actuator sleeve;

[0038] A dynamic seal ring disposed between the installation cavity and the fixed sleeve;

[0039] A fixed-end ball socket assembly detachably and washably connected to the actuator sleeve; and

[0040] A static seal ring disposed between the fixed-end ball socket assembly and the reduction motor 3.

[0041] Further, the transmission mechanism further includes a movable-end ball socket assembly that abuts against the movable sleeve and is detachably connected to the transmission nut tube.

[0042] A third aspect of the present application provides a vehicle, including the above-mentioned tailgate electric strut.

[0043] The working principle of the present application is as follows:

[0044] In a first aspect, the one-way damper has two fixed members, namely a first fixed member and a second fixed member. Among them, the outer surface of the first fixed member is fixedly installed in the installation cavity to ensure that there is no relative rotation between the two, and the inner surface of the first fixed member is nested on the circumferential outer surface of the one-way bearing; one side surface of the second fixed member is installed in the installation cavity, and the other side surface abuts against the axial side surface of the outer ring of the one-way bearing. At this time, when the tailgate is closed, the drive screw rod of the drive mechanism drives the inner and outer rings of the one-way bearing to rotate simultaneously, and the one-way bearing rubs against the first fixed member and the second fixed member respectively, thereby providing a damping force to resist the gravity generated by the tailgate, that is, the tailgate electric strut, when the tailgate is closed. In addition, an elastic member is provided. The elastic member abuts against the second fixed member. When the elastic member is compressed, it will provide an axial thrust to the first fixed member and the second fixed member. Among them, the axial thrust provided to the second fixed member becomes the normal pressure required for the second fixed member to rub against the one-way bearing. In addition, when the first fixed member cooperates with the installation cavity, it has an inclined first protrusion. Thus, when the first fixed member axially moves or has a tendency to move, a typical inclined wedge force-increasing mechanism is formed. According to different materials and ramp angles, this mechanism can convert the aforementioned axial thrust into a radial pressure that is 2 to 6 times of it. This radial pressure becomes the normal pressure required for the first fixed member to rub against the one-way bearing, and makes the generated frictional force value larger, that is, the damping force is larger. And when the first fixed member and the second fixed member are slightly worn during long-term use, due to the existence of the elastic member, it can ensure that the normal pressure required for friction remains basically unchanged.

[0045] In addition, by the screwing amount of the fastener relative to the damper housing, the damping force generated by the one-way damper can be adjusted, thereby greatly improving the applicability of the tailgate electric strut.

[0046] In a second aspect, a conventional tailgate electric strut generally includes a guide tube, which can provide motion guidance for the mechanical spring and the drive nut tube during the telescopic process of the electric strut. The damper housing integrates this set of tubes and can be formed in one manufacturing process. While reducing the cost, the overlapping amount of the original guide tube and the actuator sleeve is increased by 1 to 2 times, thereby improving the overall bending stiffness of the electric strut.

[0047] Moreover, a transmission lead screw structure is provided in the present application, which includes a transmission lead screw connected to a reduction motor. At the same time, the transmission lead screw is also connected to the inner ring of a one-way bearing. Therefore, the reduction motor drives the transmission lead screw to rotate, causing the one-way bearing to rotate forward or backward. In addition, the transmission lead screw structure further includes a nut threadedly connected to the transmission lead screw. When the reduction motor drives the transmission lead screw to rotate, the nut moves axially along the transmission nut tube to apply an axial thrust to the moving sleeve. And at this time, a mechanical spring is provided between the fixed sleeve and the moving sleeve, and the mechanical spring is in a compressed state. At this time, the compression elastic force of the mechanical spring and the axial thrust applied by the transmission lead screw structure to the moving sleeve cause the tailgate to open. Correspondingly, when the transmission lead screw rotates in the opposite direction, the nut retracts and the tailgate closes.

[0048] Moreover, at the end of the actuator sleeve, a static seal ring is provided between the reduction motor and the fixed-end ball socket assembly to prevent water or dust from entering the interior of the actuator mechanism from here.

[0049] At the front end of the actuator sleeve, an O-ring is provided between the actuator sleeve and the one-way damper to prevent water or dust from entering the interior of the actuator mechanism from here.

[0050] A dynamic seal ring is provided inside the one-way damper, and its overhanging lip is in interference fit with the transmission lead screw. On the premise of not generating a large frictional resistance, it prevents water or dust from entering the interior of the actuator mechanism between the one-way damper and the transmission lead screw.

[0051] Finally, between the fixed-end ball socket assembly and the actuator sleeve, and between the moving-end ball socket assembly and the transmission nut tube, threaded connections are used. To ensure safety and prevent the threads from loosening after long-term use, anti-loosening glue is arranged on the threads. When the product needs to be disassembled, first unscrew the moving-end ball socket assembly, and then the moving sleeve, the mechanical spring, and the fixed sleeve can be successively disassembled. Then unscrew the fixed-end ball socket assembly, and then all other components can be disassembled, thus realizing maintainability.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) This one-way damper provides a large damping force during the closing process to achieve the hovering function and ensure a stable closing process, and only generates as small a damping force as possible during the opening process of the tailgate to ensure that the tailgate can be smoothly lifted by the electric strut.

[0054] (2) The damping force of this tailgate electric strut can be adjusted. By adjusting the screwing-in amount of the fastener relative to the damper housing, the damping force generated by the one-way damper can be adjusted, thus greatly improving the applicability of this tailgate electric strut, and having the advantages of better bending stiffness, better sealing performance, and better maintainability.

[0055] (3) The electric tailgate strut uses threaded connections between the fixed-end ball socket assembly and the actuator sleeve, as well as between the mobile-end ball socket assembly and the drive nut tube. To ensure safety and prevent the threads from loosening after long-term use, anti-loosening glue is applied to the threads. When the product needs to be disassembled, first remove the mobile-end ball socket assembly, and then the moving sleeve, mechanical spring, and fixed sleeve can be successively removed. Next, remove the fixed-end ball socket assembly, and then all other components can be removed, thus achieving maintainability. Description of the Drawings

[0056] Figure 1 Schematic diagram of the structures of the components of the one-way damper in Embodiment 1.

[0057] Figure 2 Radial sectional view of the position of the one-way damper in the electric tailgate strut in Embodiment 1.

[0058] Figure 3 Partial sectional view of the position of the one-way damper in the electric tailgate strut in Embodiment 1.

[0059] Figure 4 Overall sectional view of the electric tailgate strut in Embodiment 2.

[0060] Figure 5 Schematic diagram of the structures of the components involved in sealing inside the actuator of the electric tailgate strut in Embodiment 2.

[0061] Figure 6 Structural sectional view of the components involved in sealing inside the actuator of the electric tailgate strut in Embodiment 2.

[0062] Figure 7 Structural sectional view of the connection between the fixed-end ball socket assembly and the electric strut body in Embodiment 2.

[0063] Figure 8 Structural sectional view of the connection between the mobile-end ball socket assembly and the electric strut body in Embodiment 2.

[0064] Reference numerals in the figures:

[0065] 1 - Fixed-end ball socket assembly, 2 - Actuator sleeve, 3 - Reduction motor, 4 - One-way damper, 401 - Fastener, 402 - Elastic member, 403 - First fixing member, 404 - One-way bearing, 405 - Second fixing member, 406 - Second recess, 407 - Damper housing, 408 - Installation cavity, 409 - First protrusion, 410 - First recess, 411 - Second protrusion, 5 - Fixed sleeve, 6 - Drive nut tube, 7 - Moving sleeve, 8 - Mechanical spring, 9 - Drive lead screw, 10 - Mobile-end ball socket assembly, 11 - Snap ring, 12 - Static seal ring, 13 - Dynamic seal ring, 14 - O-ring, 15 - Actuator, 16 - Transmission mechanism, 17 - Drive lead screw structure. Detailed implementation mode

[0066] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0067] In the technical solution of the present invention, features such as component models, material names, connection structures, control methods, etc. that are not clearly described are regarded as common technical features disclosed in the prior art.

[0068] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0069] In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a bolt connection or a welded connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0070] In order to provide a large damping force and achieve adjustable damping force, the present invention provides a one-way damper, which is installed on the tailgate electric strut. For its structure, please refer to Figures 1 to 3 As shown, the one-way damper includes:

[0071] A damper housing 407, which has an installation cavity 408;

[0072] A second fixing member 405, which is fixedly installed in the installation cavity 408;

[0073] A one-way bearing 404, one end of which facing outward along the axis is in frictional contact with the second fixing member, and the inner ring is connected to the tailgate electric strut; and

[0074] A first fixing member 403 located in the installation cavity 408 and sleeved outside the one-way bearing 404;

[0075] Wherein, when the tailgate electric strut drives the one-way bearing 404 to reverse, the one-way bearing 404 rotates relative to the first fixing member 403 and the second fixing member 405 respectively and generates a damping force by friction to resist the gravity of the tailgate electric strut and the tailgate;

[0076] Wherein, when the tailgate electric strut drives the one-way bearing 404 to rotate forward, the Outer ring of the one-way bearing 404 is stationary relative to the first fixing member 403 and the second fixing member 405.

[0077] In some specific embodiments, please refer to Figure 1 and Figure 2 shown, further comprising:

[0078] A fastener 401 screwed into the damper housing 407; and

[0079] An elastic member 402 interposed between the first fixing member 403 and the fastener 401;

[0080] Wherein, when the fastener 401 is screwed into the damper housing 407, the elastic member 402 is compressed to provide an axial thrust to the second fixing member 405 and the first fixing member 403.

[0081] In some specific embodiments, please refer to Figure 1 and Figure 2 shown, the first fixing member 403 is provided with a plurality of first protrusions 409, and the installation cavity 408 has a first recess 410 adapted to the first protrusions 409;

[0082] Wherein, when the inner and outer rings of the one-way bearing 404 rotate simultaneously, the first protrusions 409 and the first recesses 410 form a first friction surface.

[0083] In a more specific embodiment, please refer to Figure 1 and Figure 2 shown, the outer surface of the first protrusion 409 is inclined circumferentially towards the first fixing member 403, and the first recess 410 cooperates with the first protrusion 409.

[0084] In some specific embodiments, please refer to Figure 1 and Figure 3 shown, the second fixing member 405 is provided with a second protrusion 411, and the installation cavity 408 has a second recess 406 adapted to the second protrusion 411;

[0085] Wherein, when the inner and outer rings of the one-way bearing 404 rotate simultaneously, the second protrusions 411 and the second recesses 406 form a second friction surface.

[0086] In order to realize the detachable use of each component, provide a larger damping force, and realize the adjustable damping force, the present invention provides a tailgate electric support rod, the structure of which can be seen in Figures 1 to 8 Shown, including:

[0087] A one-way damper as described above;

[0088] An actuator 15, comprising an actuator sleeve 2 and a reduction motor 3 disposed inside the actuator sleeve 2;

[0089] a transmission mechanism 16 comprising a transmission screw structure 17 transmission-connected to the reduction motor 3 and a movable sleeve 7 surrounding the transmission screw structure 17;

[0090] The one-way damper is arranged inside the actuator 15, the transmission screw structure 17 is connected to the inner ring of the one-way bearing 404, and the reduction motor 3 drives the one-way bearing 404 to rotate forward or outward through the transmission screw structure 17;

[0091] The reduction motor 3 drives the movable sleeve 7 to stretch or retract along the axial direction through the transmission screw structure 17 to meet the opening or closing of the tailgate.

[0092] In some specific embodiments, please refer to Figures 4 to 7 As shown, the transmission mechanism 16 further includes:

[0093] a fixed sleeve 5 abutting against the actuator sleeve 2 , the movable sleeve 7 being disposed inside the fixed sleeve 5 and slidably connected to the fixed sleeve 5 ; and

[0094] a mechanical spring 8 disposed inside the fixed sleeve 5 , wherein one end of the mechanical spring 8 is fixedly connected to the fixed sleeve 5 , and the other end is fixedly connected to the movable sleeve 7 ;

[0095] The transmission screw structure 17 includes:

[0096] a transmission screw 9 connected to the reduction motor 3; and

[0097] A transmission nut tube 6 having a nut threadedly connected to the transmission screw 9, the transmission nut tube 6 surrounds the transmission screw 9, one end of the transmission nut tube 6 abuts against the damper housing 407, and the other end abuts against the movable sleeve 7;

[0098] The reduction motor 3 drives the transmission screw 9 to rotate, thereby driving the nut to move axially along the transmission nut tube 6 and applying axial thrust to the movable sleeve 7;

[0099] Among them, the mechanical spring 8 is in a compressed state.

[0100] In some specific embodiments, please refer to Figures 4 to 8 as shown, the actuator 15 further includes:

[0101] An O-ring 14, which is provided at the connection between the one-way damper and the actuator sleeve 2;

[0102] A dynamic sealing ring 13, which is located between the installation cavity 408 and the fixed sleeve 5;

[0103] A fixed-end ball socket assembly 1, which is detachably connected to the actuator sleeve 2; and

[0104] A static sealing ring 12, which is located between the fixed-end ball socket assembly 1 and the reduction motor 3.

[0105] In some specific embodiments, please refer to Figures 4 to 8 as shown, the transmission mechanism 16 further includes a mobile-end ball socket assembly 10 that abuts against the moving sleeve 7 and is detachably connected to the transmission nut tube 6.

[0106] The present invention also provides a vehicle, including the above-mentioned tailgate electric strut.

[0107] The above embodiments can be implemented separately, or in any combination of two or more.

[0108] The following will further illustrate the above embodiments in conjunction with specific examples.

[0109] Example 1

[0110] In order to provide a large damping force and achieve adjustable damping force, this embodiment provides a one-way damper, which is installed on the tailgate electric strut. Its structure is shown in Figures 1 to 3 as shown, the one-way damper includes:

[0111] A damper housing 407, which has an installation cavity 408;

[0112] A second fixing member 405, which is fixedly installed in the installation cavity 408;

[0113] A one-way bearing 404, one end of which facing outward along the axis is in frictional contact with the second fixing member, and the inner ring is connected to the tailgate electric strut; and

[0114] A first fixing member 403 located in the installation cavity 408 and sleeved outside the one-way bearing 404;

[0115] Wherein, when the tailgate electric strut drives the one-way bearing 404 to reverse, the one-way bearing 404 rotates relative to the first fixing member 403 and the second fixing member 405 respectively and generates a damping force by friction to resist the gravity of the tailgate electric strut and the tailgate;

[0116] Wherein, when the tailgate electric strut drives the one-way bearing 404 to rotate forward, Outer ring of the one-way bearing 404 it is relatively stationary with respect to the first fixing member 403 and the second fixing member 405.

[0117] Please refer to again Figure 1 and Figure 2 as shown, it further includes:

[0118] A fastener 401, which is screwed into the damper housing 407; and

[0119] An elastic member 402, which is arranged between the first fixing member 403 and the fastener 401;

[0120] Wherein, when the fastener 401 is screwed into the damper housing 407, the elastic member 402 is compressed to provide an axial thrust to the second fixing member 405 and the first fixing member 403.

[0121] Please refer to again Figure 1 and Figure 2 as shown, the first fixing member 403 is provided with a plurality of first protrusions 409, and the installation cavity 408 has first depressions 410 that cooperate with the first protrusions 409;

[0122] Wherein, when the inner and outer rings of the one-way bearing 404 rotate simultaneously, the first protrusions 409 and the first depressions 410 form a first friction surface.

[0123] Please refer to again Figure 1 and Figure 2 as shown, the outer surface of the first protrusion 409 is inclined circumferentially towards the first fixing member 403, and the first depression 410 cooperates with the first protrusion 409.

[0124] Please refer to again Figure 1 and Figure 3 as shown, the second fixing member 405 is provided with second protrusions 411, and the installation cavity 408 has second depressions 406 that cooperate with the second protrusions 411;

[0125] Wherein, when the inner and outer rings of the one-way bearing 404 rotate simultaneously, the second protrusions 411 and the second depressions 406 form a second friction surface.

[0126] Embodiment 2

[0127] In order to enable each component to be detachably used, provide a large damping force, and enable the damping force to be adjustable, this embodiment provides a tailgate electric strut, the structure of which please refer to Figures 1 to 8As shown, it includes:

[0128] A one-way damper in Embodiment 1;

[0129] An actuator 15, which includes an actuator sleeve 2 and a reduction motor 3 disposed inside the actuator sleeve 2;

[0130] A transmission mechanism 16, which has a transmission lead screw structure 17 drivingly connected to the reduction motor 3 and a moving sleeve 7 disposed to surround the transmission lead screw structure 17;

[0131] Wherein, the one-way damper is disposed inside the actuator 15, the transmission lead screw structure 17 is connected to the inner ring of the one-way bearing 404, and the reduction motor 3 drives the one-way bearing 404 to rotate forward or externally through the transmission lead screw structure 17;

[0132] Wherein, the reduction motor 3 drives the moving sleeve 7 to axially stretch or expand through the transmission lead screw structure 17 to meet the opening or closing of the tailgate.

[0133] Please refer to Figures 4 to 7 As shown, the transmission mechanism 16 further includes:

[0134] A fixed sleeve 5, which abuts against the actuator sleeve 2, and the moving sleeve 7 is disposed inside the fixed sleeve 5 and is slidably connected to the fixed sleeve 5; and

[0135] A mechanical spring 8, which is disposed inside the fixed sleeve 5, one end of the mechanical spring 8 is fixedly connected to the fixed sleeve 5, and the other end is fixedly connected to the moving sleeve 7;

[0136] The transmission lead screw structure 17 includes:

[0137] A transmission lead screw 9, which is connected to the reduction motor 3; and

[0138] A transmission nut tube 6, which is provided with a nut threadedly connected to the transmission lead screw 9, the transmission nut tube 6 surrounds the transmission lead screw 9, one end of the transmission nut tube 6 abuts against the damper housing 407, and the other end abuts against the moving sleeve 7;

[0139] Wherein, the reduction motor 3 drives the transmission lead screw 9 to rotate to drive the nut to move axially along the transmission nut tube 6 and apply an axial thrust to the moving sleeve 7;

[0140] Wherein, the mechanical spring 8 is in a compressed state.

[0141] Please refer to Figures 4 to 8 As shown, the actuator 15 further includes:

[0142] An O-ring 14, which is disposed at the connection between the one-way damper and the actuator sleeve 2;

[0143] A dynamic sealing ring 13, which is located between the installation cavity 408 and the fixed sleeve 5;

[0144] A fixed-end ball socket assembly 1, which is detachably and washably connected to the actuator sleeve 2; and

[0145] A static sealing ring 12, which is located between the fixed-end ball socket assembly 1 and the reduction motor 3.

[0146] Please refer again to Figures 4 to 8 As shown, the transmission mechanism 16 further includes a mobile-end ball socket assembly 10 that abuts against the moving sleeve 7 and is detachably connected to the transmission nut tube 6.

[0147] Please refer again to Figures 4 to 8 As shown, the transmission lead screw 9 is connected to the inner ring of the one-way bearing 404 through a snap ring 11.

[0148] The working principles of Embodiment 1 and Embodiment 2 are as follows:

[0149] First, the one-way damper 4 has two fixing parts, namely a first fixing part 403 and a second fixing part 405. Among them, the outer surface of the first fixing part 403 is fixedly installed in the installation cavity 408 to ensure that there is no relative rotation between the two, and the inner surface of the first fixing part 403 is nested on the circumferential outer surface of the one-way bearing 404; one side of the second fixing part 405 is installed in the installation cavity 408, and the other side abuts against the axial side surface of the outer ring of the one-way bearing 404. At this time, when closing the tailgate, the transmission lead screw 9 of the transmission mechanism 16 drives the inner and outer rings of the one-way bearing 404 to rotate simultaneously, and the one-way bearing 404 frictions with the first fixing part 403 and the second fixing part 405 respectively, thereby providing a damping force to resist the gravity generated by the tailgate and the tailgate electric strut when closing the tailgate. In addition, an elastic member 402 is provided. The elastic member 402 abuts against the second fixing part 405. When the elastic member 402 is compressed, it will provide an axial thrust to the first fixing part 403 and the second fixing part 405. Among them, the axial thrust provided to the second fixing part 405 becomes the normal pressure required for the second fixing part 405 to friction with the one-way bearing 404. In addition, when the first fixing part 403 cooperates with the installation cavity 408, it has an inclined first convex part 409. Thus, when the first fixing part 403 axially moves or has a tendency to move, a typical wedge force-increasing mechanism is formed. According to the materials and the slope angle, this mechanism can convert the aforementioned axial thrust into a radial pressure that is 2 to 6 times of it. This radial pressure becomes the normal pressure required for the first fixing part 403 to friction with the one-way bearing 404, and makes the generated frictional force value larger, that is, the damping force is larger. And when the first fixing part 403 and the second fixing part 405 are slightly worn during long-term use, due to the existence of the elastic member 402, it can ensure that the normal pressure required for friction remains basically unchanged.

[0150] In addition, the damping force generated by the one-way damper 4 can be adjusted by the screwing amount of the fastener 401 relative to the damper housing 407, thereby greatly improving the applicability of the tailgate electric strut.

[0151] In the second aspect, an existing tailgate electric strut generally includes a guide tube, which can provide movement guidance for the mechanical spring and the transmission nut tube during the telescopic process of the electric strut. The damper housing 407 integrates this set of tubes and can be formed in one piece, reducing costs while increasing the overlap amount between the original guide tube and the actuator sleeve by 1 to 2 times, thereby improving the overall bending stiffness of the electric strut.

[0152] Moreover, a transmission lead screw structure 17 is provided in this application. It includes a transmission lead screw 9, which is connected to the reduction motor 3. At the same time, the transmission lead screw 9 is also connected to the inner ring of the one-way bearing 404. Therefore, when the reduction motor 3 drives the transmission lead screw 9 to rotate, the one-way bearing 404 rotates forward or backward. In addition, the transmission lead screw structure 17 further includes a nut threadedly connected to the transmission lead screw 9. When the reduction motor 3 drives the transmission lead screw 9 to rotate, the nut moves axially along the transmission nut tube 6 to apply an axial thrust to the moving sleeve 7. And at this time, a mechanical spring 8 is provided between the fixed sleeve 5 and the moving sleeve 7, and the mechanical spring 8 is in a compressed state. At this time, the compression elastic force of the mechanical spring 8 and the axial thrust applied by the transmission lead screw structure 17 to the moving sleeve 7 cause the tailgate to open. Correspondingly, when the transmission lead screw 9 rotates in the opposite direction and the nut retracts, the tailgate closes.

[0153] Moreover, at the end of the actuator sleeve 2, a static seal ring 12 is provided between the reduction motor 3 and the fixed-end ball socket assembly 1 to prevent water or dust from entering the interior of the actuator mechanism 16 from here;

[0154] At the front end of the actuator sleeve 2, an O-ring 14 is provided between the actuator sleeve 2 and the one-way damper 4 to prevent water or dust from entering the interior of the actuator mechanism 15 from here;

[0155] A dynamic seal ring 13 is provided inside the one-way damper 4. Its overhanging lip is in interference fit with the transmission lead screw 9. On the premise of not generating a large frictional resistance, it prevents water or dust from entering the interior of the actuator mechanism 15 between the one-way damper 4 and the transmission lead screw 9.

[0156] Finally, between the fixed-end ball socket assembly 1 and the actuator sleeve 2, and between the mobile-end ball socket assembly 10 and the transmission nut tube 6, threaded connections are used. To ensure safety and prevent the threads from loosening after long-term use, anti-loosening glue is arranged on the threads. When the product needs to be disassembled, first unscrew the mobile-end ball socket assembly 10, and then the moving sleeve 7, the mechanical spring 8, and the fixed sleeve 5 can be successively removed. Then unscrew the fixed-end ball socket assembly 1, and then all other components can be removed, thus realizing maintainability.

[0157] Embodiment 3

[0158] This embodiment also provides a vehicle, including a tailgate electric strut in Embodiment 2.

[0159] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A one-way damper is installed on the tailgate electric strut, and is characterized in that, The one-way damper includes: A damper housing (407) having an installation cavity (408); A second fixing member (405) fixedly installed in the installation cavity (408); A one-way bearing (404) whose one end facing outward along the axial direction is in frictional contact with the second fixing member, and the inner ring is connected to the tailgate electric strut; and A first fixing member (403) located in the installation cavity (408) and sleeved outside the one-way bearing (404); Wherein, when the tailgate electric strut drives the one-way bearing (404) to reverse, the one-way bearing (404) rotates relative to the first fixing member (403) and the second fixing member (405) respectively and generates a damping force by friction to resist the gravity of the tailgate electric strut and the tailgate; Wherein, when the tailgate electric strut drives the one-way bearing (404) to rotate forward, the outer ring of the one-way bearing (404) is relatively stationary with respect to the first fixing member (403) and the second fixing member (405).

2. The one-way damper according to claim 1, characterized in that, It further includes: A fastener (401) screwed into the damper housing (407); and An elastic member (402) interposed between the first fixing member (403) and the fastener (401); Wherein, when the fastener (401) is screwed into the damper housing (407), the elastic member (402) is compressed to provide an axial thrust to the second fixing member (405) and the first fixing member (403).

3. A one-way damper according to claim 1, characterized in that, The first fixing member (403) is provided with a plurality of first protrusions (409), and the installation cavity (408) has a first recess (410) cooperating with the first protrusions (409); Wherein, when the inner and outer rings of the one-way bearing (404) rotate simultaneously, the first protrusions (409) and the first recesses (410) form a first friction surface.

4. The one-way damper according to claim 3, wherein The outer surface of the first protrusion (409) is inclined circumferentially towards the first fixing member (403), and the first recess (410) cooperates with the first protrusion (409).

5. A one-way damper according to claim 1, characterized in that, The second fixing member (405) is provided with a second protrusion (411), and the installation cavity (408) has a second recess (406) cooperating with the second protrusion (411); Wherein, when the inner and outer rings of the one-way bearing (404) rotate simultaneously, the second protrusions (411) and the second recesses (406) form a second friction surface.

6. A tailgate electric strut, characterized in that, It includes: A one-way damper according to any one of claims 1-5; An actuator (15) including an actuator sleeve (2) and a reduction motor (3) disposed inside the actuator sleeve (2); A transmission mechanism (16) including a transmission lead screw structure (17) drivingly connected to the reduction motor (3) and a moving sleeve (7) disposed surrounding the transmission lead screw structure (17); Wherein, the one-way damper is disposed inside the actuator (15), the transmission lead screw structure (17) is connected to the inner ring of the one-way bearing (404), and the reduction motor (3) drives the one-way bearing (404) to rotate forward or outward through the transmission lead screw structure (17); Wherein, the reduction motor (3) drives the movable sleeve (7) to axially stretch or expand through the transmission lead screw structure (17) to meet the opening or closing of the tailgate.

7. The power tailgate strut according to claim 6, wherein, The transmission mechanism (16) further includes: A fixed sleeve (5) which abuts against the actuator sleeve (2), and the movable sleeve (7) is arranged inside the fixed sleeve (5) and is slidably connected to the fixed sleeve (5); and A mechanical spring (8) which is arranged inside the fixed sleeve (5), one end of the mechanical spring (8) is fixedly connected to the fixed sleeve (5), and the other end is fixedly connected to the movable sleeve (7); The transmission lead screw structure (17) includes: A transmission lead screw (9) which is connected to the reduction motor (3); and A transmission nut tube (6) which is provided with a nut threadedly connected to the transmission lead screw (9), the transmission nut tube (6) surrounds the transmission lead screw (9), one end of the transmission nut tube (6) abuts against the damper housing (407), and the other end abuts against the movable sleeve (7); Wherein, the reduction motor (3) drives the transmission lead screw (9) to rotate to drive the nut to move axially along the transmission nut tube (6) and apply an axial thrust to the movable sleeve (7); Wherein, the mechanical spring (8) is in a compressed state.

8. The electric tailgate strut according to claim 6, characterized in that, The actuator mechanism (15) further includes: An O-ring (14) which is arranged at the connection between the one-way damper and the actuator sleeve (2); A dynamic seal ring (13) which is between the installation cavity (408) and the fixed sleeve (5); A fixed-end ball socket assembly (1) which is detachably and washably connected to the actuator sleeve (2); and A static seal ring (12) which is between the fixed-end ball socket assembly (1) and the reduction motor 3.

9. The electric tailgate strut according to claim 6, characterized in that, The transmission mechanism (16) further includes a movable-end ball socket assembly (10) which abuts against the movable sleeve (7) and is detachably connected to the transmission nut tube (6).

10. A vehicle, characterized in that, It includes a tailgate electric strut according to any one of claims 6-9.

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