Hatchback tailgate electric support rod

Abstract

A hatchback tailgate electric strut comprises a housing assembly (1) and a drive assembly (2); the housing assembly (1) comprises an inner sleeve (11) and an outer sleeve (12) that cooperate with each other, a spring sleeve (13), a motor outer tube (14), a wiring harness assembly (15), a ball head seat assembly (18), and a spring (17); the drive assembly (2) comprises a motor reducer assembly (22), a coupling assembly (21), a lead screw assembly (23), and a ball head seat assembly (18); the lead screw assembly (23) comprises lead screws that cooperate with each other (231) and a lead screw nut (232), characterized in that: a damper assembly (16) is provided at one end of the lead screw (231), and the damper assembly (16) comprises a damper housing assembly, a pair of outer friction plates (162, 163) fixed in the housing assembly, a wave spring (166) limited between the first outer friction plate (162) and the inner wall of the housing, an inner friction plate (165) limited between the outer friction plates (162, 163), and a damper shaft (164) keyed to the inner friction plate (165). It has the advantages of simple and compact structure, convenient and quick use, easy processing, low cost, long service life, etc.

Description

Technical Field

[0001] The present invention relates to a power operating mechanism for swinging wing panels, which is driven by a rotating motor and adopts a lead screw and a lead screw nut, and is specifically an electric support rod for a hatchback tailgate, which may involve the IPC classification number E05F15 / 622. Background Art

[0002] The electric strut of the hatchback's tailgate can realize automatic opening and closing of the tailgate, that is, the weight of the tailgate is balanced by the spring, and the motor drives the strut to axially extend and retract to realize automatic opening and closing of the tailgate.

[0003] The existing tailgate electric strut, such as the invention patent application with IPC classification number E05F15 / 622 (2015.01) and application publication number CN107630622A, discloses an "improved electric strut", whose technical solution specifically includes an outer tube and an inner tube slidably matched with the outer tube, a bushing is provided between the inner tube and the outer tube, a transmission mechanism for driving the inner tube to slide along its axial direction is provided inside the outer tube, a motor, a gear box and an inner spline body are provided at the bottom of the outer tube, a gear ring is provided between the gear box and the outer tube, the output shaft of the motor is connected to the input shaft of the gear box, the inner spline body is arranged on the gear box through a gear box cover and connected to the output shaft of the gear box, the input end of the transmission mechanism is plugged into the inner spline body, a bearing seat is provided between the gear box cover and the bushing, a first ball head seat and a second ball head seat matched with a bracket ball head arranged on the tailgate of the automobile and the automobile body are provided at the front end of the inner tube and the bottom end of the outer tube respectively, and a spring is provided on the outer side of the transmission mechanism.

[0004] Although it can realize the basic functions of the electric strut, it still has the following defects: the axial connection strength is unreliable, which can easily lead to spring popping and mechanism failure, and poor safety; the lack of an effective waterproof sealing structure not only increases the equipment loss, but also affects the stability and service life of the equipment; the dynamic (sliding) sealing design between the shell components is unreasonable, and it is impossible to take into account both sealing and smooth operation; the damping force cannot be adjusted according to actual application conditions, which can easily lead to unstable operation; the assembly processability of parts and components is poor, and the dimensional accuracy requirements of parts and components are high, resulting in a low yield rate, which is not conducive to assembly and indirectly increases the manufacturing cost.

[0005] Due to the above defects, the tolerances between components and assembly tolerances are accumulated, which leads to coaxial deviation of stroke and vibration problems in operation, and finally affects its NVH comprehensive performance (i.e. comprehensive performance related to noise, vibration and harshness). Summary of the invention

[0006] The purpose of the present invention is to provide an electric support rod for the tailgate of a hatchback car, which fundamentally solves the above problems and has the advantages of simple and compact structure, convenient and quick use, easy processing, low cost and long service life.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: the electric support rod for a car tailgate comprises a housing assembly (1) and a driving assembly (2), wherein the housing assembly (1) comprises an inner sleeve (11) and an outer sleeve (12) which cooperate with each other, a spring sleeve (13), a motor outer tube (14), a wiring harness assembly (15), a ball head seat assembly (18), and a spring (17); the driving assembly (2) comprises a motor reducer assembly (22), a coupling assembly (21), a screw assembly (23), and a ball head seat assembly (18); the screw assembly (23) The invention comprises a lead screw (231) and a lead screw nut (232) which cooperate with each other. The technical key points are as follows: a damper assembly (16) is provided at one end of the lead screw (231), and the damper assembly (16) comprises a damper housing assembly, a pair of outer friction plates (162, 163) fixed in the housing assembly, a wave spring (166) limited between the first outer friction plate (162) and the inner wall of the housing, an inner friction plate (165) limited between the outer friction plates (162, 163), and a damper shaft (164) keyed to the inner friction plate (165).

[0008] Furthermore, in order to improve the circumferential toughness of the support rod, an elastic coupling assembly is used, and the coupling assembly (21) includes a screw seat (211) matched with the screw, a coupling seat (213) matched with the output shaft of the motor reducer assembly (22), and a plum blossom-shaped buffer block (212) limited between the screw seat (211) and the coupling seat (213).

[0009] A dynamic seal including a star-shaped sealing ring (132) is provided between the spring sleeve (13) and the lead screw nut (232).

[0010] Beneficial effects of the present invention: a dynamic sealing structure is arranged between the spring sleeve and the lead screw nut, specifically comprising a bushing, a washer, and a star-shaped sealing ring limited between the bushing and the washer. The star-shaped sealing ring is effectively limited by the bushing, thereby avoiding the blocking effect caused by the sealing ring while ensuring the sealing between the spring sleeve and the lead screw nut.

[0011] An elastic coupling assembly is arranged between the lead screw and the motor reducer assembly, specifically comprising a lead screw seat 211 and a coupling seat 213 that cooperate with each other, and a hexagonal plum blossom-shaped buffer block 212 limited therebetween. The lead screw seat 211 and the coupling seat 213 are respectively provided with three mutually cooperating fan-shaped protrusions evenly distributed along the circumference, and the hexagonal plum blossom-shaped buffer block 212 is embedded therein. Once the lead screw shaft and the motor output shaft are bent, through the coupling effect, when the bending degree is small, the axial error between the two end shafts can still be compensated by the buffer block 212, thereby improving the stability of operation.

[0012] By setting various parts of the damper assembly, the damping size can be adjusted quickly and conveniently. Specifically, the adjustment structure related to the damping torque of the damper assembly, such as the shell thickness, spring elastic force (spring compression distance, self-elasticity coefficient), and the sliding friction coefficient between the outer friction plate and the inner friction plate (related to material and surface roughness), can be used to quantitatively design and adjust the damping torque of the strut to meet the damping force requirements of different models, so as to achieve the comfort of opening and closing the tailgate and the safety of hovering at any angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the general assembly structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the explosion structure of the present invention.

[0015] Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0016] Figure 3a for Figure 3 Schematic diagram of the cross-sectional structure along line BB.

[0017] Figure 4 It is a schematic structural diagram of the coupling assembly of the present invention.

[0018] Figure 4a for Figure 4 Schematic diagram of the cross-sectional structure along line CC.

[0019] Figure 4b It is a schematic diagram of the exploded structure of the coupling assembly of the present invention.

[0020] Figure 5 It is a structural schematic diagram of the ball head seat of the present invention.

[0021] Figure 5a for Figure 5 Schematic diagram of the cross-sectional structure along line DD.

[0022] Figure 5b for Figure 5 Schematic diagram of the side structure.

[0023] Figure 6 It is a partial enlarged structural schematic diagram of the spring sleeve assembly of the present invention.

[0024] Figure 6a for Figure 6 Schematic diagram of the cross-sectional structure along line EE.

[0025] Figure 6b for Figure 6 Schematic diagram of the exploded structure of the spring sleeve end.

[0026] Figure 6c for Figure 6a Schematic diagram of the partially enlarged structure of the center star-shaped sealing ring.

[0027] Figure 7 It is a schematic structural diagram of the damper assembly of the present invention.

[0028] Figure 7a for Figure 7 Schematic diagram of the cross-sectional structure along line FF.

[0029] Figure 7b It is a schematic diagram of the explosion structure of the damper assembly of the present invention. DETAILED DESCRIPTION

[0030] The following combination Figures 1 to 7 The specific content of the present invention is described in detail through specific embodiments. The electric support rod for the hatchback tailgate includes a housing assembly 1 and a drive assembly 2. The housing assembly 1 includes an inner sleeve 11 and an outer sleeve 12 that cooperate with each other, a spring sleeve 13, a motor outer tube 14, a wiring harness assembly 15, a ball head seat assembly 18, and a spring 17.

[0031] like Figure 3a As shown, after a guide washer 2312 is sandwiched between two screw rings 2311 to form a sandwich structure, it is matched with the axial hole of the optical axis part at the end of the screw 231. After the screw 231 is screwed with the screw nut 232 through the thread, the spline end of the screw 231 is inserted into the bearing washer 233, the bearing 235, the bearing seat 234, the screw seat 211, the screw washer 236, and the middle seal ring 2313 in sequence. This structure assembles ten parts into an integral structure through a two-step riveting process, which is simple in process and reliable in connection; the riveting structure at both ends can withstand high-strength axial tension to prevent the spring from popping out and the mechanism from failing due to the axial pulling off of the support rod; the guide washer 2312 plays a guiding and centering role in the telescopic operation of the screw 231 and the screw nut 232, solving the problem of yaw caused by the screw 231 and the screw nut 232 running out of the same axis.

[0032] like Figure 6aAs shown, the dynamic sealing structure between the lead screw nut 232 and the spring sleeve 13 not only meets the sealing requirements of waterproof and dustproof, but also meets the dynamic sliding requirements between the lead screw nut 232 and the spring sleeve 13, avoiding the operation blockage problem caused by the seal. Specifically, the dynamic sealing structure is to sequentially install the gasket 133, the star-shaped sealing ring 132 and the bushing 131 in the spring sleeve 13, and perform circumferential riveting on the ring riveting positions of the bushing 131 and the spring sleeve 13. The star-shaped sealing ring 132 is axially fixed by the bushing 131 and the gasket 133, and the radial inner and outer sealing lips overlap the outer wall of the lead screw nut 232 and the inner wall of the spring sleeve 13 respectively. The cross section of the star-shaped sealing ring 132 is a four-petal star-shaped structure. The two petal sealing lips of the outer ring are in contact with the inner wall of the spring sleeve 13, and static sealing is achieved under the compression of the lead screw nut 232; the two petal sealing lips of the inner ring are in contact with the outer wall of the lead screw nut 232, and dynamic sealing is achieved under the compression of the spring sleeve 13. This dynamic sealing structure simultaneously realizes the static sealing of the sealing ring 132 and the inner wall of the spring sleeve 13, and the dynamic sealing of the sealing ring 132 and the outer wall of the lead screw nut 232. The star-shaped structure provides compression and deformation space for the four-petal sealing lips. While sealing, the sliding resistance of the sliding surface will not be increased, and the support rod is prevented from being stuck due to excessive resistance.

[0033] like Figure 5a As shown, after the wiring harness assembly 15 is installed into the motor ball head seat 184 through the mounting hole on the motor ball head seat 184, three screws 188 are used to press the fixing plate 187 against the sealing lip at the end of the wiring harness assembly 15, and then screwed into the motor ball head seat 184 for fixing. The interference fit generated by pressing the sealing lip at the end of the wiring harness assembly 15 with the fixing plate 187 is used to perform a waterproof seal. The three screws 188 distributed at 120° lock the fixing plate 187, the sealing lip of the wiring harness assembly 15 and the motor ball head seat 184. The sealing lip of the wiring harness assembly 15 is clamped between the fixing plate 187 and the motor ball head seat 184 to achieve a higher waterproof level and sealing reliability.

[0034] The drive assembly 2 includes a motor reducer assembly 22, a coupling assembly 21, a screw assembly 23, and a ball head seat assembly 18. Among them, a vibration damping pad 221 is set at one end of the motor reducer assembly 22, and a gear box seat 222 is set at the other end. The coupling assembly 21 is arranged between the screw 231 and the motor reducer assembly 22, which can buffer and reduce vibration for the torque transmission between the screw 231 and the motor reducer assembly 22, and the start and stop moments of the strut are smoother; in addition, the addition of the coupling assembly 21 can compensate for the coaxiality deviation of the strut caused by the tolerance of components and manufacturing tolerances, reduce the operating vibration caused by the coaxiality deviation, and improve the NVH performance. Figure 4a and 4bAs shown, the coupling assembly 21 specifically includes a screw seat 211 keyed to the screw 231, a coupling seat 213 keyed to the output shaft of the motor reducer assembly 22, and a hexagonal plum blossom 212 embedded and limited between the screw seat 211 and the coupling seat 213, thereby transmitting the torque between the motor reducer assembly 22 and the screw 231.

[0035] like Figure 7a , Figure 7b As shown, the lead screw assembly 23 includes a lead screw 231 and a lead screw nut 232 that cooperate with each other. A damper assembly 16 is provided at one end of the lead screw 231, and the damper assembly 16 includes a damper housing assembly (preferably a damper cover 161 and a damper housing 167 that are screwed together), a pair of outer friction plates (162, 163) fixed in the damper housing 167, a wave spring 166 limited between the first outer friction plate 162 and the inner wall of the housing, an inner friction plate 165 limited between the outer friction plates (162, 163), and a damper shaft 164 keyed to the inner friction plate 165. The inner ring of the outer friction plate is circular, and four boss structures are evenly distributed along the circumference of the outer ring, which are correspondingly engaged with the grooves on the inner wall of the damper housing 167 to limit the rotation of the outer friction plate; the outer ring of the inner friction plate 165 is circular, and its inner ring is spline-connected with the damper shaft 164. Inside the damper housing 167, the wave spring 166 applies force to support the first outer friction plate 162, the second outer friction plate 163 and the inner friction plate 165. The damper shaft 164 is connected to the screw 231 through a spline. Driven by the damper shaft 164, the inner friction plate 165 rotates inside the two outer friction plates. Under the force of the wave spring 166, the two outer friction plates apply pressure to the inner friction plate 165, thereby generating a damping torque. The damping torque can be quantitatively adjusted by adjusting the elastic force of the wave spring 166.

[0036] The ball head seat assembly 18 includes a ball head base 181, a ball head spring 183, a ball seat sealing ring 182, and a screw nut O-ring 185 located on the screw side; and a motor ball head seat 184, a ball head spring 183, a motor end sealing ring 186, a fixing plate 187, and a screw 188 located on the motor side.

[0037] The present invention can actually adopt a variety of implementations, such as the lead screw 231 directly cooperates with the damper assembly 15; the lead screw 231 directly cooperates with the coupling assembly 21; the lead screw 231 indirectly cooperates with the damper assembly 15 through the coupling assembly 21. Among them, the third embodiment is not shown in the drawings, but those skilled in the art should be able to directly obtain the technical solution under the overall inventive concept disclosed in the specification.

[0038] Description of reference numerals:

[0039] 1 Shell assembly

[0040] 11Inner casing

[0041] 12 Outer sleeve

[0042] 13 Spring sleeve

[0043] 131 Bushing

[0044] 132 star seal

[0045] 133 gasket

[0046] 14 Motor outer tube

[0047] 15 wiring harness assembly

[0048] 16 Damper assembly

[0049] 161 Damper Cover

[0050] 162 first outer friction plate

[0051] 163 Second outer friction plate

[0052] 164 damper shaft

[0053] 165 inner friction plate

[0054] 166 wave spring

[0055] 167 Damper Housing

[0056] 17 Spring

[0057] 18 ball head assembly

[0058] 181 ball head base

[0059] 182 ball seat seal

[0060] 183 ball head reed

[0061] 184 motor ball seat

[0062] 185 Screw nut O-ring

[0063] 186 motor end seal ring

[0064] 187 fixed plate

[0065] 188 screws

[0066] 2. Drive components

[0067] 21 coupling assembly

[0068] 211 screw seat

[0069] 212 buffer block

[0070] 213 coupling seat

[0071] 22 Motor reducer assembly

[0072] 221 vibration damping pad

[0073] 222 gear box seat

[0074] 23 Screw assembly

[0075] 231 screw

[0076] 2311 Screw Ring

[0077] 2312 guide gasket

[0078] 2313 middle sealing ring

[0079] 232 screw nut

[0080] 233 bearing washer

[0081] 234 bearing seat

[0082] 235 bearings

[0083] 236 screw washer.

Claims

1. An electric rear door support rod for a hatchback vehicle, comprising a housing assembly (1) and a drive assembly (2), wherein the housing assembly (1) comprises an inner sleeve (11) and an outer sleeve (12) that cooperate with each other, a spring sleeve (13), a motor outer tube (14), a wiring harness assembly (15), a ball head seat assembly (18), and a spring (17); The driving assembly (2) comprises a motor reducer assembly (22), a coupling assembly (21), a lead screw assembly (23), and a ball seat assembly (18); The screw assembly (23) comprises a screw (231) and a screw nut (232) which cooperate with each other, and is characterized in that: A damper assembly (16) is provided at one end of the lead screw (231), the damper assembly (16) comprising a damper housing assembly, a pair of outer friction plates (162, 163) fixed in the housing assembly, a wave spring (166) limited between the first outer friction plate (162) and the inner wall of the housing, an inner friction plate (165) limited between the outer friction plates (162, 163), and a damper shaft (164) keyed to the inner friction plate (165); The coupling assembly (21) comprises a screw seat (211) matched with the screw, a coupling seat (213) matched with the output shaft of the motor reducer assembly (22), and a plum blossom-shaped buffer block (212) limited between the screw seat (211) and the coupling seat (213); A dynamic seal including a star-shaped sealing ring (132) is provided between the spring sleeve (13) and the lead screw nut (232); The cross section of the star-shaped sealing ring (132) is a four-petal star-shaped structure, the two petal sealing lips of the outer ring are in contact with the inner wall surface of the spring sleeve (13), and static sealing is achieved under the compression of the screw nut (232); the two petal sealing lips of the inner ring are in contact with the outer wall surface of the screw nut (232), and dynamic sealing is achieved under the compression of the spring sleeve (13); Under the force of the wave spring (166), the two outer friction plates exert pressure on the inner friction plate (165), thereby generating a damping torque. The damping torque can be quantitatively adjusted by adjusting the elastic force of the wave spring (166).

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