L-shaped tail door supporting rod

Abstract

An L-shaped tail door supporting rod comprises a driving assembly (1), a telescopic arm assembly (2) and a shell assembly (3), and is technically characterized in that the driving assembly (1) comprises a motor speed reducer assembly (11) and a worm (12) matched with the output end of the motor speed reducer assembly (11) through a worm coupler (111); the worm (12) is limited in the shell assembly (3) in a self-rotating mode through a pair of bearings (121 and 122). The telescopic arm assembly (2) comprises a guide pipe (21), a lead screw nut assembly (22) arranged in the guide pipe (21) in a matched mode, a lead screw seat (24) arranged at one end of the lead screw nut assembly (22) in a matched mode through a lead screw seat bearing (241), a worm wheel assembly (25) arranged on the lead screw seat (24) in a rotatable matched mode, a plum blossom pad (23) limited between the lead screw seat (24) and the worm wheel assembly (25) and a magnetic damper assembly (26) arranged at one end of the worm wheel assembly (25) in a matched mode. The problem that in the prior art, a straight rod type supporting rod cannot meet the requirements for the opening angle and spatial layout of a tail door in a large vehicle is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and specifically relates to an L-shaped tailgate strut. Background Art

[0002] With the rapid development of the automotive industry, the design of automotive tailgates has become increasingly diverse to meet the requirements of different vehicle models and usage scenarios. Existing automotive tailgate struts are mainly divided into three categories: gas spring struts, hydraulic struts, and electric struts. Among them, hydraulic struts achieve damping control through the mixture of hydraulic oil and gas, and have high stability, but they are relatively large in size and require a relatively large installation space. Electric struts achieve linear motion through a motor-driven lead screw or worm system, and usually integrate an intelligent control module to support the automatic opening and closing function of the tailgate. A typical electric strut structure includes components such as a motor, planetary gears, a lead screw, and a spring, and has a high level of intelligence and automation.

[0003] Traditional automotive tailgate struts are mostly of a straight rod design. Although the structure is simple, in some vehicle models, especially in large vehicles such as SUVs and MPVs, straight rod struts often cannot meet the requirements of the tailgate opening angle and space layout. In addition, during the installation and use of straight rod struts, they are easily restricted by the vehicle body structure, resulting in unsmooth tailgate opening or uneven force on the struts, thereby affecting their service life. Especially in vehicle models with complex body structures, the installation position and angle of straight rod struts are greatly restricted, easily leading to insufficient tailgate opening angle or uneven force on the struts, thus affecting the normal use of the tailgate and the durability of the struts.

[0004] To solve the problems of the above-mentioned straight rod electric struts, technicians in the field have improved and designed L-shaped electric struts. L-shaped electric struts are mainly divided into two types: single-rod L-shaped electric struts and double-rod L-shaped electric struts. Single-rod L-shaped electric struts are arranged on one side, with an internal motor worm / lead screw system, and the other side is a passive support rod. This design is mainly suitable for compact vehicle bodies and has advantages such as low cost and small space occupancy. However, due to single-side drive, single-rod L-shaped electric struts are prone to causing tailgate distortion and deformation, and may have problems such as incomplete closing after long-term use. In addition, the single rod bears all the loads, and its fatigue life is lower than that of double-rod struts, having disadvantages such as uneven force and poor durability.

[0005] The double-rod L-shaped electric strut is arranged symmetrically on both sides, with motors and synchronous control systems integrated on both sides. This design has the advantages of high synchronism, balanced force, and strong torsional resistance, effectively avoiding problems such as tailgate distortion and improper closing. However, due to the dual-drive mode, the assembly cost of the double-rod strut is relatively high, and precise synchronous algorithms and installation and debugging are required, which is rather difficult. Nevertheless, the double-rod L-shaped electric strut has broad application prospects in large vehicles, especially in models with high requirements for tailgate opening angle and support stability, showing significant advantages.

[0006] However, there are still some problems in the use of the L-shaped tailgate strut, such as insufficient supporting force and poor stability. These problems not only affect the use effect of the tailgate but also may pose a threat to the safety of users. Therefore, developing a new type of L-shaped tailgate strut to improve its supporting force and stability has important practical significance. Summary of the Invention

[0007] The object of the present invention is to provide an L-shaped tailgate strut, aiming to solve the problem that the straight-rod strut in the prior art cannot meet the requirements of tailgate opening angle and spatial layout in large vehicles such as SUVs and MPVs. Through the strut structure with an L-shaped design, it can better adapt to the tailgate opening angle and body structure, thus providing a smoother tailgate opening experience and a more uniform force distribution, and prolonging the service life of the strut. It provides a smoother and more stable tailgate opening experience and has broad application prospects. It effectively solves the problem that the straight-rod strut in the prior art is limited in application in large vehicles.

[0008] To achieve the above object, the present invention provides the following technical solutions: The L-shaped tailgate strut includes a drive assembly, a telescopic arm assembly, and a housing assembly. The output shaft of the drive assembly is perpendicular to the telescopic direction of the telescopic arm assembly. The technical key points are: The drive assembly includes a motor reducer assembly and a worm that is cooperated with the output end of the motor reducer assembly through a worm coupling; the worm is rotatably limited in the housing assembly through a pair of bearings; The telescopic arm assembly includes a guide tube, a lead screw nut assembly fitted in the guide tube, a lead screw seat cooperated with one end of the lead screw nut assembly through a lead screw seat bearing, a worm gear assembly rotatably fitted on the lead screw seat, a plum blossom pad limited between the lead screw seat and the worm gear assembly, and a magnetic damper assembly fitted at one end of the worm gear assembly; The lead screw nut assembly includes a lead screw and a lead screw nut that are screwed together, and a nut sleeve is fixed on the lead screw nut; The worm gear assembly includes a main body with a helical gear at one end, a bearing end coaxially arranged with the helical gear, a worm gear bearing fitted on the bearing end, and a damping end. The main body is rotatably limited in the housing assembly through the worm gear bearing, and the helical gear is engaged with the worm; The magnetic damper assembly includes a damper housing and a damper base that are screwed together, a pair of carbon fiber sheets limited therebetween, and a transmission sheet with straight teeth provided inside and squeezed between the carbon fiber sheets. The transmission sheet meshes with the damping end of the worm gear assembly through the straight teeth on its inner side.

[0009] Further, the lead screw includes a screw rod section as the main structure, a connecting rear end and a connecting front end with helical teeth provided at both ends of the screw rod section, and a mating rear end with straight teeth provided at the rear end of the connecting rear end. The mating rear end meshes with the internal teeth in the lead screw seat.

[0010] Further, the lead screw seat includes a lead screw seat main body with internal teeth in the lead screw seat provided through one end, and a number of supporting feet provided circumferentially at the other end of the main body. A number of gear mating portions equal to the number of supporting feet are provided circumferentially on the end face of the helical gear. The spoke-shaped plum blossom pad is provided with a number of convex claws circumferentially and is fitted in the gap between the supporting feet and the gear mating portions, and the number of convex claws is twice the number of supporting feet.

[0011] Further, the guide tube and the nut sleeve are of a hollow structure, and a number of assembly holes are provided at one end thereof circumferentially. The inner wall of the guide tube is provided with a guide groove with a spoke-shaped cross section along the length direction; the lead screw nut includes a through tube with internal threads provided on the inner wall, a number of guide ribs provided circumferentially and mating with the guide groove, and a lock provided between the guide ribs and the through tube and mating with the assembly holes.

[0012] Further, the guide tube is fitted in the spring seat at one end of the main housing through a clamping portion provided at one end thereof.

[0013] Further, the lead screw nut is fixed at the proximal end of the nut sleeve, and a ball head seat separator is fixed at the distal end of the nut sleeve. A guide gasket is provided at an interval between the ball head seat separator and the lead screw. The guide gasket is provided with a number of elastic grooves circumferentially.

[0014] Further, a number of carbon fiber sheet slots are distributed circumferentially and extend along the length direction on the inner wall of the damper base. A number of positioning protrusions mating with the carbon fiber sheet slots are provided circumferentially on the outer edge of the carbon fiber sheet.

[0015] Further, the housing assembly includes a main housing composed of an upper housing and a lower housing that cooperate with each other, a spring end sleeve that is elastically telescopic and fitted at the distal end of the main housing, a motor ball head seat embedded with a ball seat buffer pad at the proximal end of the main housing, a ball head base fixed on the spring end sleeve, and a telescopic spring fitted between the main housing and the spring end sleeve.

[0016] Furthermore, a spring seat for fixing the telescopic spring is provided at the first end of the upper housing and the lower housing, a convex end for fixing the motor ball head seat is provided opposite to the second end, and a motor cavity is provided at the third end; a lead screw bearing slot for limiting the lead screw seat bearing is provided inside the first end of the lower housing, a worm gear bearing slot for limiting the worm gear bearing and a damper slot for limiting the magnetic damper assembly are successively provided from the inside to the outside at the second end, a motor cavity is provided inside the third end, and a worm gear bearing slot for limiting the worm is provided in the middle of the lower housing; strip-shaped grooves for embedding the worm gear bearings are respectively provided at the upper and lower ends of the worm gear bearing slot, and positioning tongues inserted into the strip-shaped grooves are respectively provided at the upper and lower ends in the middle of the upper housing.

[0017] Advantages of the present invention: In terms of the overall technical solution, the L-shaped tailgate strut of the present invention adopts a unique L-shaped structural design. Through the coordinated operation of the drive assembly, the telescopic arm assembly and the housing assembly, the smooth opening and closing of the tailgate are realized. The motor reducer assembly in the drive assembly effectively transmits power, and the meshing of the worm and the worm gear assembly not only changes the direction of motion but also provides a speed reduction function. The telescopic arm assembly cooperates with the telescopic spring to achieve stable telescopic motion. The lead screw nut assembly in the telescopic arm assembly converts the rotational motion of the worm gear into a linear motion, realizing the telescopic function of the tailgate. The magnetic damper assembly at the end of the worm gear assembly provides an adjustable damping effect through the cooperation of the carbon fiber sheet and the transmission sheet, making the tailgate more stable during the opening and closing processes, avoiding impacts and noises. The use of the plum blossom pad and the bearing further optimizes the cooperation between components, reduces friction and wear, and improves the overall durability and reliability. In addition, this design adopts a modular structure, which is convenient for installation and maintenance, and at the same time, the protection of the housing assembly extends the service life of the internal components.

[0018] Through the structural design in which the drive assembly and the telescopic arm assembly are perpendicular to each other, the strut can better adapt to the motion trajectory of the tailgate when the tailgate is opened, and can evenly disperse stress when stressed, improving the overall mechanical properties of the strut, and avoiding problems such as local stress concentration of the traditional straight rod strut, uneven stress or spatial interference caused by too large an opening angle of the tailgate. It helps to extend the service life of the strut and reduce the occurrence of failures.

[0019] Through the coordinated action of each component, the smooth opening and closing of the tailgate are achieved. In the drive component, the motor reducer component transmits power to the worm through the worm coupling. The worm meshes with the worm gear component, not only changing the direction of motion but also providing a speed reduction function to ensure the stable movement of the telescopic arm component. In the telescopic arm component, the lead screw nut component converts the rotational motion of the worm gear into linear motion to achieve the telescopic function of the tailgate. The magnetic damper component provides an adjustable damping effect through the cooperation of the carbon fiber sheet and the drive sheet, making the tailgate more stable during the opening and closing processes, avoiding impacts and noises. The use of the plum blossom pad and the bearing further optimizes the cooperation between components, reducing friction and wear, and improving the overall durability and reliability. The housing component is composed of an upper housing and a lower housing. The cooperation of the telescopic spring and the spring end sleeve enables the support rod to have an elastic telescopic function, further enhancing the opening and closing experience of the tailgate. In terms of material selection, the present invention preferably uses high-strength lightweight materials to ensure that the support rod has high strength while being light in weight and corrosion-resistant, thereby extending its service life.

[0020] In summary, through innovative structural design and material selection, the L-shaped tailgate support rod of the present invention effectively solves the problem of limited application of traditional straight support rods in large vehicles, providing users with a smoother and more stable tailgate opening experience. At the same time, it also provides a more flexible and reliable solution for the automotive manufacturing industry. In addition, advanced damping technology is adopted, which can effectively reduce the vibration and impact during the opening and closing processes of the tailgate, improving the comfort and stability of the tailgate in use. Meanwhile, the support rod also has good waterproof and dustproof performance, capable of adapting to various harsh environmental conditions. Brief Description of the Drawings

[0021] Figure 1 It is an isometric view structural schematic diagram of the present invention.

[0022] Figure 1a It is Figure 1 The structural schematic diagram after removing the housing component.

[0023] Figure 2 It is the exploded structural schematic diagram of the present invention.

[0024] Figure 3 It is Structural Schematic Diagram I of the damper part of the present invention.

[0025] Figure 4 It is Figure 3 The structural schematic diagram after removing the damper housing.

[0026] Figure 5 It is Figure 3 The structural schematic diagram after removing the damper base.

[0027] Figure 6 It is Structural Schematic Diagram II of the damper part of the present invention.

[0028] Figure 7 This is a schematic exploded view of the worm gear assembly of the present invention.

[0029] Figure 8 This is a schematic exploded view of the damper assembly of the present invention.

[0030] Figure 9 This is a schematic exploded view of the lead screw nut assembly of the present invention.

[0031] Explanation of reference numerals in the drawings: 1 drive assembly, 11 motor reducer assembly, 111 worm coupling, 112 wire harness assembly, 12 worm, 121 upper bearing of the worm, 122 lower bearing of the worm; 2 telescopic arm assembly, 21 guide tube, 211 clamping portion, 212 guide groove, 22 lead screw nut assembly, 221 lead screw, 2211 connecting front end, 2212 connecting rear end, 2213 mating rear end, 2214 lead screw section, 222 lead screw nut, 2221 guide rib, 2222 lock, 2223 through tube, 2223a internal thread, 223 nut sleeve, 2231 assembly hole, 224 guide gasket, 2241 elastic groove, 225 ball head seat spacer, 23 plum blossom pad, 24 lead screw seat, 241 lead screw seat bearing, 242 internal teeth of the lead screw seat, 243 support leg, 25 worm gear assembly, 251 helical gear, 2511 gear mating portion, 252 worm gear bearing, 253 bearing end, 254 damping end, 26 magnetic damper assembly, 261 damper housing, 262 damper base, 2621 carbon fiber sheet slot, 263 drive sheet, 264 carbon fiber sheet, 2641 positioning protrusion; 3 housing assembly, 31 upper housing, 311 upper housing spring seat, 312 positioning tongue, 32 lower housing, 321 lower housing spring seat, 322 worm bearing slot, 323 motor cavity, 324 worm gear bearing slot, 325 damper slot, 326 lead screw bearing slot, 33 telescopic spring, 34 ball head base, 35 spring end sleeve, 36 motor ball head seat, 361 ball seat buffer pad. Detailed implementation manners

[0032] The following is combined with Figures 1 - 9, the specific content of the present invention will be described in detail through specific embodiments. The L-shaped tailgate strut includes a drive assembly 1, a telescopic arm assembly 2, and a housing assembly 3. The output shaft of the drive assembly 1 is perpendicular to the telescopic direction of the telescopic arm assembly 2. The drive assembly 1 includes a motor reducer assembly 11 and a worm 12 fitted to the output end of the motor reducer assembly 11 through a worm coupling 111; the worm 12 is rotatably limited within the housing assembly 3 by a pair of upper worm bearings 121 and lower worm bearings 122.

[0033] As Figure 2 , Figure 6 shown, the housing assembly 3 includes a main housing composed of a mutually cooperating upper housing 31 and a lower housing 32, a spring end sleeve 35 that is elastically telescopic and assembled at the distal end of the main housing, a motor ball head seat 36 with a ball seat cushion 361 embedded therein located at the proximal end of the main housing, a ball head base 34 fixed on the spring end sleeve 35, and a telescopic spring 33 fitted between the main housing and the spring end sleeve 35. The upper housing 31 and the lower housing 32 are fastened by 8 bolts and are articulated and cooperated with the ball head pins on the vehicle body and the tailgate through the ball head bases 34 and the motor ball head seats 36 at both ends. The ball seat cushion 361 is used to compensate for the machining error between the motor ball head seat 36 and the magnetic damper assembly 26, so that the magnetic damper assembly 26 is firmly limited within the housing assembly and prevented from disengaging from the damping end 254 of the worm gear assembly 25.

[0034] The first ends of the upper housing 31 and the lower housing 32 are provided with spring seats 311 and 321 for fixing the telescopic spring 33, the second ends are relatively provided with protruding ends for fixing the motor ball head seat 36, and the third ends are provided with a motor cavity 323; the inner side of the first end of the lower housing 32 is provided with a lead screw bearing slot 326 for limiting the lead screw seat bearing 241, the second end is successively provided with a worm gear bearing slot 324 for limiting the worm gear bearing 252 and a damper slot 325 for limiting the magnetic damper assembly 26 from the inside to the outside, the third end is internally provided with a motor cavity 323, and a worm bearing slot 322 for limiting the worm 12 is provided in the middle of the lower housing 32; strip-shaped grooves for embedding the worm bearings are respectively provided at the upper and lower ends of the worm bearing slot 322, and positioning tongues 312 inserted into the strip-shaped grooves are respectively provided at the upper and lower ends in the middle of the upper housing 31.

[0035] As Figure 1a , Figure 2 , Figure 3 shown, the telescopic arm assembly 2 includes a guide tube 21, a lead screw nut assembly 22 fitted within the guide tube 21, a lead screw seat 24 fitted to one end of the lead screw nut assembly 22 through a lead screw seat bearing 241, a worm gear assembly 25 rotatably fitted on the lead screw seat 24, a plum blossom pad 23 limited between the lead screw seat 24 and the worm gear assembly 25, and a magnetic damper assembly 26 fitted to one end of the worm gear assembly 25; As Figure 9As shown, the lead screw nut assembly 22 includes a lead screw 221 and a lead screw nut 222 that are screwed together, and a nut sleeve 223 is fixed on the lead screw nut 222. The lead screw 221 includes a screw rod section 2214 as the main structure, a connecting rear end 2212 and a connecting front end 2211 with helical teeth provided at both ends of the screw rod section 2214, and a mating rear end 2213 with straight teeth provided at the rear end of the connecting rear end 2212. The mating rear end 2213 meshes with the internal teeth 242 of the lead screw seat. Further, external threads are provided on the outer walls of the connecting front end 2211 and the connecting rear end 2212, and they have the same helix direction, pitch, diameter, and precision as the screw rod section 2214, and only a cliff structure is provided at the connection. The purpose of adopting this structural design is, on the one hand, that the threads with the same helix direction and pitch will not interfere with the normal screwing assembly of the lead screw nut 222 and the screw rod section 2214 during installation; on the other hand, the cliff structure prevents the lead screw nut 222 from rotating excessively and plays a role in preventing loosening. Even further, in order to prevent the excessive movement of the lead screw nut 222, a guiding gasket 224 with an expansion function is also provided at the end of the connecting front end 2211.

[0036] The lead screw nut 222 is fixed at the proximal end of the nut sleeve 223, and a ball head seat separator 225 is fixed at the distal end of the nut sleeve 223. A guiding gasket 224 is provided at an interval between the ball head seat separator 225 and the lead screw 221. The guiding gasket 224 is provided with a number of elastic grooves 2241 along the circumferential direction. As Figure 3 shown, the guiding tube 21 is fitted into a card slot (not marked in the figure) of a spring seat at one end of the main housing through a clamping portion 211 provided at one end thereof.

[0037] The guiding tube 21 and the nut sleeve 223 are of a hollow structure. A number of assembly holes 2231 are provided along the circumferential direction at one end thereof. A guiding groove 212 with a spoke-shaped cross-section is provided along the length direction of the inner wall of the guiding tube 21; the lead screw nut 222 includes a through tube 2223 with an internal thread 2223a provided on the inner wall, a number of guiding ribs 2221 provided along the circumferential direction and mating with the guiding groove 212, and a lock 2222 provided between the guiding rib 2221 and the through tube 2223 and mating with the assembly hole 2231. The distance between the guiding rib 2221 and the through tube 2223 is approximately the thickness of the lock 2222 or the wall thickness of the nut sleeve 223, so that when assembling, the nut sleeve 223 can just be embedded in this gap to achieve a perfect fit. Preferably, the locks 2222 are arranged in groups of two along the length direction of the guiding rib 2221 and are matched with the positions of the assembly holes 2231.

[0038] The lead screw seat 24 includes a lead screw seat 24 main body with a lead screw seat internal tooth 242 penetrating through one end, and a number of supporting feet 243 arranged circumferentially at the other end of the main body. A number of gear engaging portions 2511 equal in number to the supporting feet 243 are arranged circumferentially on the end face of the helical gear 251. The spoke-shaped plum blossom pad 23 is provided with a number of convex claws circumferentially, which are fitted into the gap between the supporting feet 243 and the gear engaging portions 2511, and the number of convex claws is twice the number of supporting feet 243.

[0039] The worm gear assembly 25 includes a main body with a helical gear 251 at one end, a bearing end 253 coaxially arranged with the helical gear 251, a worm gear bearing 252 fitted on the bearing end 253, and a damping end 254. The main body is spin-limited in the housing assembly 3 through the worm gear bearing 252, and the helical gear 251 is engaged with the worm 12; The magnetic damper assembly 26 includes a damper housing 261 and a damper base 262 that are screwed together, a pair of carbon fiber sheets 264 limited therebetween, and a drive sheet 263 with straight teeth provided inside and squeezed between the carbon fiber sheets 264. The drive sheet 263 is engaged with the damping end 254 of the worm gear assembly 25 through the straight teeth on its inner side. A number of carbon fiber sheet slots 2621 are distributed circumferentially and extend in the length direction on the inner wall of the damper base 262, and a number of positioning protrusions 2641 that cooperate with the carbon fiber sheet slots 2621 are provided circumferentially on the outer edge of the carbon fiber sheet 264.

[0040] In the prior art, the worm coupling 111 also functions as the magnetic damper assembly 26 at the same time. In the present invention, the worm gear assembly 25 is combined with the plum blossom pad 23 to limit the magnetic damper assembly 26. The damping end 254 of the worm gear assembly 25 is combined with the drive sheet 263 of the magnetic damper assembly 26 to apply the damping force, so that the performance of the product such as hovering and running smoothness meets the expected requirements. At the same time, the plum blossom pad 23 as the worm coupling is retained for possible modification and expansion of subsequent products.

[0041] Working principle: The motor reducer assembly 11 is powered on through the wire harness assembly 112 to output torque, which is transmitted to the worm 12 by the worm coupling 111. The worm 12 further transmits the torque to the helical gear 251 of the worm gear assembly 25, thereby achieving torque amplification and speed reduction. The limit worm gear bearing 252 is clamped on the bearing end 253 in the middle of the worm gear assembly 25, so that the worm gear assembly 25 can rotate relative to the housing assembly. The damping end 254 at the rear of the worm gear assembly 25 is in direct tooth engagement with the inner wall straight teeth of the transmission piece 263 in the magnetic damper assembly 26 through straight teeth. Thus, when the worm gear assembly 25 rotates, it drives the transmission piece 263 to rotate, and the transmission piece 263 rubs against the carbon fiber pieces 264 arranged on both sides to generate reverse damping. The gear mating portion 2511 provided on the helical gear 251 cooperates with the support leg 243 of the lead screw seat 24 to limit the plum blossom pad 23 (lead screw coupling) therebetween. When the helical gear 251 rotates, it synchronously drives the lead screw seat 24 to rotate. The lead screw seat 24 meshes with the mating rear end 2213 of the lead screw 221 through the internal teeth 242 in the lead screw seat. The rotation of the lead screw 221 drives the movement of the lead screw nut 222 that mates with it, realizing the final conversion of the torque of the motor reducer assembly 11 into the linear movement of the lead screw nut 222, and achieving the extension and contraction of the telescopic arm assembly 2, corresponding to the closing and opening of the car tailgate or trunk lid.

[0042] The telescopic spring 33, as one of the core components of the electric strut, is mainly responsible for providing support force and buffering. It is usually made of high-strength spring steel and undergoes special heat treatment processes to ensure its elasticity and durability. When the front end of the worm gear assembly 25 drives the lead screw 221 to rotate through the lead screw seat 24, the lead screw nut 222 makes a linear movement along the lead screw 221. Under the combined action of the guiding rib 2221 and the guiding groove 212 on the inner wall of the guiding tube 21, the lead screw nut 222 drives the nut sleeve 223 to move linearly along the guiding tube 21, further pushing the spring end sleeve 35 to move outward. At this time, the guiding tube 21 is stretched and stores energy; when the spring end sleeve 35 contracts inward, the guiding tube 21 releases energy to help the strut move smoothly. This energy conversion mechanism not only improves the response speed of the strut but also effectively reduces the impact and noise during the movement. In addition, the telescopic spring 33 also has good buffering performance, capable of absorbing external impact forces and protecting other components inside the strut from damage. Especially in applications such as car sunroofs and trunk lids, the stability and reliability of the telescopic spring 33 directly affect the overall user experience and service life.

Claims

1. An L-shaped tailgate strut, comprising a drive assembly (1), a telescopic arm assembly (2), and a housing assembly (3). The output shaft of the drive assembly (1) is perpendicular to the telescopic direction of the telescopic arm assembly (2), and is characterized in that: The drive assembly (1) includes a motor reducer assembly (11) and a worm (12) fitted to the output end of the motor reducer assembly (11) through a worm coupling (111); the worm (12) is rotatably limited within the housing assembly (3) by a pair of bearings (121, 122); The telescopic arm assembly (2) includes a guide tube (21), a lead screw nut assembly (22) fitted within the guide tube (21), a lead screw base (24) fitted to one end of the lead screw nut assembly (22) through a lead screw base bearing (241), a worm gear assembly (25) rotatably fitted on the lead screw base (24), a plum blossom pad (23) limited between the lead screw base (24) and the worm gear assembly (25), and a magnetic damper assembly (26) fitted to one end of the worm gear assembly (25); The lead screw nut assembly (22) includes a lead screw (221) and a lead screw nut (222) that are screwed together, and a nut sleeve (223) is fixed to the lead screw nut (222); The worm gear assembly (25) includes a main body with a helical gear (251) provided at one end, a bearing end (253) coaxially arranged with the helical gear (251), a worm gear bearing (252) fitted on the bearing end (253), and a damping end (254). The main body is rotatably limited within the housing assembly (3) by the worm gear bearing (252), and the helical gear (251) is engaged with the worm (12); The magnetic damper assembly (26) includes a damper housing (261) and a damper base (262) that are screwed together, a pair of carbon fiber sheets (264) limited therebetween, and a transmission sheet (263) with straight teeth provided inside and pressed between the carbon fiber sheets (264). The transmission sheet (263) is engaged with the damping end (254) of the worm gear assembly (25) through the straight teeth on its inner side.

2. The L-shaped tailgate strut according to claim 1, characterized in that: The lead screw (221) includes a lead screw section (2214) as the main structure, a connecting rear end (2212) and a connecting front end (2211) with helical teeth provided at both ends of the lead screw section (2214), and a mating rear end (2213) with straight teeth provided at the rear of the connecting rear end (2212). The mating rear end (2213) is engaged with the internal teeth (242) of the lead screw base.

3. The L-shaped tailgate strut according to claim 1, characterized in that: The lead screw base (24) includes a lead screw base main body with internal teeth (242) provided through one end, and a plurality of feet (243) arranged circumferentially at the other end of the main body. A plurality of gear mating portions (2511) with the same number as the feet (243) are arranged circumferentially on the end face of the helical gear (251). The spoke-shaped plum blossom pad (23) is provided with a plurality of convex claws circumferentially, and is fitted in the gap between the feet (243) and the gear mating portions (2511), and the number of convex claws is twice the number of feet (243).

4. The L-shaped tailgate strut according to claim 1, wherein: The guide tube (21) and the nut sleeve (223) are of hollow structure. A number of circumferentially arranged assembly holes (2231) are provided at one end thereof. A guide groove (212) with a spoke-shaped cross section is provided on the inner wall of the guide tube (21) along the length direction; the lead screw nut (222) includes a through tube (2223) with an internal thread (2223a) provided on the inner wall, a number of circumferentially arranged guide ribs (2221) that cooperate with the guide groove (212), and a latch (2222) that is arranged between the guide ribs (2221) and the through tube (2223) and cooperates with the assembly hole (2231).

5. The L-shaped tailgate strut according to claim 1, wherein: The guide tube (21) is fitted into the spring seat at one end of the main housing through a clamping portion (211) provided at one end thereof.

6. The L-shaped tailgate strut according to claim 1, wherein: The lead screw nut (222) is fixed to the proximal end of the nut sleeve (223). A ball head seat separator (225) is fixed to the distal end of the nut sleeve (223). A guide gasket (224) is provided at an interval between the ball head seat separator (225) and the lead screw (221). A number of elastic grooves (2241) are provided on the guide gasket (224) along the circumferential direction.

7. The L-shaped tailgate strut according to claim 1, wherein: A number of carbon fiber sheet slots (2621) that are circumferentially distributed and extend along the length direction are provided on the inner wall of the damper base (262). A number of positioning protrusions (2641) that cooperate with the carbon fiber sheet slots (2621) are provided on the outer edge of the carbon fiber sheet (264) along the circumferential direction.

8. The L-shaped tailgate strut according to claim 1, characterized in that: The housing assembly (3) includes a main housing composed of a upper housing (31) and a lower housing (32) that cooperate with each other, a spring end sleeve (35) that is elastically telescopic and assembled at the distal end of the main housing, a motor ball head seat (36) that is embedded with a ball seat buffer pad (361) at the proximal end of the main housing, a ball head base (34) that is fixed to the spring end sleeve (35), and a telescopic spring (33) that is fitted between the main housing and the spring end sleeve (35).

9. The L-shaped tailgate strut according to claim 8, wherein: Spring seats (311, 321) for fixing the telescopic spring (33) are provided at the first ends of the upper housing (31) and the lower housing (32). Convex ends for fixing the motor ball head seat (36) are provided opposite to each other at the second ends. A motor cavity (323) is provided at the third ends; a lead screw bearing slot (326) for limiting the lead screw seat bearing (241) is provided on the inner side of the first end of the lower housing (32). A worm gear bearing slot (324) for limiting the worm gear bearing (252) and a damper slot (325) for limiting the magnetic damper assembly (26) are provided in sequence from the inside to the outside at the second end. A motor cavity (323) is provided inside the third end. A worm gear bearing slot (322) for limiting the worm (12) is provided in the middle of the lower housing (32); strip-shaped slots for embedding the worm gear bearings are provided at the upper and lower ends of the worm gear bearing slot (322). Positioning tongues (312) that are inserted into the strip-shaped slots are provided at the upper and lower ends in the middle of the upper housing (31).

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