Electric tailgate support rod structure for cars

Abstract

A car electric tailgate support rod mechanism comprises a driving assembly (1) and a housing assembly (2), characterized in that the driving assembly (1) further comprises a driving gear (13) directly bonded to a motor reducer assembly (11), a transmission gear (14) limited by a transmission shaft (141), and a driven gear (15) bonded to one end of a lead screw; a motor bushing (12) is sealed on the driving gear (13), and a lead screw bushing (164) is sealed on the driven gear (15). The invention has the advantages of being simple and reliable, having high production efficiency, low cost, and having a long service life.

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 particularly suitable for use as a small support rod mechanism with limited installation space, and is specifically a support rod structure for an electric tailgate of a car, which may involve the IPC classification number E05F15 / 622. Background Art

[0002] The electric tailgate strut of a car can realize the automatic opening and closing of the car 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 the automatic opening and closing of the tailgate. Due to the size limitation of the car luggage compartment, the traditional single-axis electric strut has insufficient space for arrangement and cannot be applied to the car luggage compartment. In order to solve the above problem, a short electric tailgate strut has been designed in the prior art.

[0003] An existing short electric tailgate support rod, such as IPC classification number E05F15 / 622 (2005.01), application publication number CN108825040A discloses an electric support rod for automatically opening and closing the tailgate of a three-compartment car. Its technical solution mainly includes a shell, the shell includes a first shell and a second shell that are hollow inside and connected to each other through a first cavity; a tension spring is arranged outside the second shell; a motor is coaxially installed in the first shell, and the motor drives the driving wheel located in the first shell to rotate; a driven wheel is installed in one end of the second shell; a driven wheel fixing shaft is sleeved inside the driven wheel, and one end of the driven wheel fixing shaft is connected to one end of the screw through a screw shaft sleeve; an end of the screw away from the nut is fixed to one end of the second shell adjacent to it, and the driving wheel drives the driven wheel to rotate through a bridge gear.

[0004] However, the above solution still has the following problems: the motor is directly engaged with the multiple protrusions of the upper shell through the grooves at the bottom, and the motor inevitably vibrates during operation. Due to the lack of effective vibration reduction or sound insulation measures, the motor operation noise is too loud.

[0005] One end of the screw rod is connected to one end of the fixed shaft through a screw rod sleeve, and the driven gear is arranged on the fixed shaft. Summary of the invention

[0006] The purpose of the present invention is to provide a car electric tailgate support rod structure, which fundamentally solves the above problems and has the advantages of simplicity, reliability, high production efficiency, low cost, long service life, etc.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the electric tailgate support rod structure of a car comprises a driving assembly (1) and a housing assembly (2); the housing assembly (2) comprises a main housing (29) and a lower housing (26) which are separately arranged, and a motor cover (21), a tension spring (27) with a spring end sleeve (271) at the end, and a ball sleeve assembly (28); the main housing (29) comprises a tension spring (27) connecting portion and a motor mounting portion (292) which are separately arranged on both sides; the driving assembly (1) comprises a motor reducer assembly (11) which is limited in the motor mounting portion (292), a screw assembly (16), a guide tube assembly (165), a bearing seat (166) which is limited in the main housing (29), and a limit The invention relates to a drive assembly (16) comprising a lead screw (161) and a lead screw nut (163) located in a guide tube (1651); a guide tube assembly (165) comprising a guide tube (1651) with a plastic coating (1651a) at one end thereof and limited in a main housing (29); the technical key points are as follows: the drive assembly (1) also comprises a driving gear (13) directly bonded to a motor reducer assembly (11), a transmission gear (14) limited by a transmission shaft (141), and a driven gear (15) bonded to one end of the lead screw; a motor bushing (12) is sealed on the driving gear (13), and a lead screw bushing (164) is sealed on the driven gear (15).

[0008] A front vibration-damping sleeve (24) matched with the driving gear (13) is provided at one end of the motor reducer assembly (11), and a rear vibration-damping sleeve (22) matched with the wiring assembly is provided at the other end. The rear vibration-damping sleeve comprises an annular portion matched with the outer edge of the motor, a main connecting rib (221) with a wiring port, and a plurality of side supporting ribs (222) arranged along the circumferential direction.

[0009] The front vibration damping sleeve (24) comprises an annular cover structure matched with the motor reducer assembly (11), a bottom of which is provided with an annular supporting lip (242), and an inner side of which is provided with a plurality of inner recesses (241) matched with the motor reducer assembly (11).

[0010] The motor bushing (12) and / or the lead screw bushing (164) are provided with a plurality of clamping ribs along the circumferential direction, and a groove (261) provided with a pointed protrusion and used for limiting the clamping ribs is provided in the lower housing (26).

[0011] The front vibration damping sleeve (24) or the rear vibration damping sleeve (22) is made of EPDM.

[0012] The ball sleeve assembly (28) includes an upper ball seat assembly (285) matched with the spring end sleeve (271) and a lower ball seat assembly (283) matched with the lower shell (26); the lower ball seat assembly (283) includes a ball head bracket (282) with a positioning column and a buffer pad (281) located in the ball head bracket (282).

[0013] Beneficial effects of the present invention: In terms of overall layout, the arrangement of the motor reducer assembly and the lead screw assembly adopts a parallel layout similar to the prior art, which effectively saves about 1 / 3 of the axial space compared to the coaxial arrangement of the motor reducer assembly and the lead screw assembly, so that it can be used in the luggage compartment of a car with limited axial space. The torque output by the motor reducer assembly is transmitted to the lead screw assembly through three gears. The split structure of the guide tube assembly and the main housing effectively solves the problem of complex overmolding molds and difficulty in positioning the guide tube caused by direct overmolding of the guide tube in the main housing.

[0014] The screw bushing and the motor bushing are limited in the lower shell by the raised structure set on the outer edge, so that they are limited in the circumferential direction. The inner circumference of the bushing fits tightly with the end of the driving gear or the driven gear to form a seal, which prevents rainwater or car wash water from entering the motor reducer assembly or the screw nut assembly, effectively ensuring the performance of the motor and the screw, thereby extending its service life. A number of snap-in ribs are provided on the outer edge of the bushing, and the bushing is firmly limited in the lower shell by the raised structure and the groove with a triangular raised protrusion on the lower shell, simplifying the assembly process. In addition, the screw bushing and the motor bushing are respectively slidably matched with the ends of the driving gear and the driven gear, serving as a damping structure to prevent the weight of the tailgate.

[0015] The present invention directly bonds the driven gear to the lead screw. Compared with the split structure in the prior art, the fixed shaft and the lead screw are integrated, and the coupling (the lead screw sleeve is used in the prior art) structure is omitted; by adopting a compact motor reducer assembly, the driving gear is directly limited in the reducer, and the driving gear and the driven gear are connected through the transmission gear bonded to the transmission shaft. Through the above structure, the number of parts is reduced as much as possible, the overall structural layout is optimized, and the structure is made simpler and more compact while ensuring the sealing performance.

[0016] Compared with the electric struts in the prior art that use anti-jam shock absorbers, due to the limitation of its working principle, the active wheel shaft connected to the shock absorber must adopt a split structure separated from the motor output shaft. Specifically, the anti-jam structure relies on the spring set in the shock absorber to drive the separated shaft to temporarily (slide) separate from the motor output shaft. In order to ensure the stability of the motor operation, the motor output shaft must adopt a fixed structure. Therefore, in order to achieve the purpose of anti-jam, a split structure must be adopted, that is, there is no technical inspiration for integrating the split structure.

[0017] In order to ensure the stability of the motor reducer assembly during operation and reduce its noise, front and rear damping sleeves are respectively set at the front and rear ends of the motor reducer assembly. Among them, the front damping sleeve is set between the bearing seat and the reducer of the motor reducer assembly, which effectively buffers the reaction force exerted on the reducer by the transmission mechanism and the bearing seat. The rear damping sleeve is a hollow structure, and a number of main connecting ribs are set on the side to connect the upper and lower annular parts. The contact position between the lower annular part and the main shell is provided with longitudinally distributed side support ribs, which improves the noise reduction function of the motor reducer assembly while ensuring the stability of the structure.

[0018] In summary, the electric tailgate support rod of the present invention adopts a more streamlined number of components and a more compact structural layout, which makes assembly simpler, has a higher productivity and a lower failure rate, and effectively reduces the difficulty of product promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the general assembly drawing of the present invention.

[0020] Figure 2 It is an exploded view of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0022] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure.

[0023] Figure 4a for Figure 4 Schematic diagram of the cross-sectional structure along line AA.

[0024] Figure 5 It is a schematic structural diagram of the housing assembly of the present invention.

[0025] Figure 5a for Figure 5 Schematic diagram of the structure of the middle spring end sleeve.

[0026] Figure 5b for Figure 5 Schematic diagram of the cross-sectional structure along line BB.

[0027] Figure 5c for Figure 5 Schematic diagram of the cross-sectional structure along line CC.

[0028] Figure 5d for Figure 5 Schematic diagram of the cross-sectional structure along line DD.

[0029] Figure 6 It is a schematic diagram of the assembly structure of the lower housing, the screw bushing and the motor bushing.

[0030] Figure 7It is an isometric structural schematic diagram of the motor mounting assembly of the present invention.

[0031] Figure 7a It is an isometric side structural schematic diagram of the rear vibration damping sleeve of the present invention.

[0032] Figure 7b It is an isometric side structural schematic diagram of the front vibration damping sleeve of the present invention.

[0033] Figure 8 It is a schematic diagram of the installation structure of the lower ball seat assembly and the lower shell of the present invention.

[0034] Figure 8a It is an isometric side view structural schematic diagram of the ball head bracket of the present invention. DETAILED DESCRIPTION

[0035] The following combination Figures 1 to 8 The specific contents of the present invention are described in detail through specific embodiments. The electric tailgate support rod structure of a car comprises a driving assembly (1) and a housing assembly 2. The housing assembly 2 comprises a main housing 29 and a lower housing 26 and a motor cover 21 which are separately arranged, a tension spring 27 with a spring end sleeve 271 at the end, and a ball sleeve assembly 28. The main housing 29 comprises a tension spring 27 connecting portion and a motor mounting portion 292 which are separately arranged on both sides. The lower housing 26 is fixed to the main housing 29 by housing screws 25, and the motor cover 21 is fixed to the main housing 29 by cover screws 23. Between the main housing 29 and the tension spring 27, the spring end sleeve 271 and the tension spring connecting portion 291 are provided with external threads, which are directly injection molded and connected with the tension spring thread. The threaded side opposite to the spring end sleeve 271 is an external hexagonal structure 2711, which serves as a process clamping structure for the spring end sleeve 271 to be screwed with the tension spring thread.

[0036] The drive assembly 1 includes a motor reducer assembly 11 limited in the motor mounting portion 292 (the motor reducer 11 assembly is purchased from a supplier, and the structure of this component is not elaborated in detail), a screw assembly 16, a guide tube assembly 165, a bearing seat 166 limited in the main housing 29, a bearing 167 limited in the bearing seat 166, and an O-ring 1631.

[0037] After riveting, the inner ring of the bearing 167 is fixed to the lead screw 161, and the outer ring of the bearing 167 is clamped between the bearing seat 166 and the guide tube 1651. The bearing 167 is fixed axially to achieve axial thrust of the lead screw 161. A lead screw ring 162 is provided between the driven gear 15 and the lead screw 161. After fixing, the smooth outer ring of the end of the driven gear 15 and the inner ring of the lead screw bushing 164 are slidably matched to achieve radial constraint of the lead screw 161. Therefore, the lead screw 161 can be limited in the axial and radial directions by only using a single bearing 167, and the structure is simple, compact and low in cost.

[0038] The lead screw assembly 16 includes a lead screw 161 and a lead screw nut 163 located in a guide tube 1651. The guide tube assembly 165 includes a guide tube 1651 with a plastic coating 1651a at one end thereof and limited in the main housing 29. A bushing 1652 for limiting the lead screw 161 is provided at one end of the guide tube 1651. The spline end of the lead screw 161 is sequentially inserted into the bearing 167, the bearing seat 166, the driven gear 15 and the lead screw gasket 1611, and the end of the lead screw 161 is riveted and fixed. The guide tube 1651 adopts an aluminum tube end plastic coating 1651a, and the guide tube plastic coating 1651a preferably adopts an outer pentagonal structure. The main housing 29 is provided with an inner pentagonal structure at the matching position. After the guide tube assembly is assembled with the main housing, the pentagonal interlocking is played to play a role of fixing and anti-rotation.

[0039] The driving assembly 1 also includes a driving gear 13 directly bonded to the motor reducer assembly 11, a transmission gear 14 limited by a transmission shaft 141, and a driven gear 15 bonded to one end of the lead screw; a motor bushing 12 is sealed on the driving gear 13, and a lead screw bushing 164 is sealed on the driven gear 15.

[0040] One end of the motor reducer assembly 11 is provided with a front vibration damping sleeve 24 that matches the driving gear 13, and the other end is provided with a rear vibration damping sleeve 22 that matches the wiring assembly. The rear vibration damping sleeve includes a hollow annular portion that matches the outer edge of the motor, a main connecting rib 221 with a wiring port, and a plurality of side support ribs 222 arranged along the circumferential direction (six ribs are used as an example in the embodiment). The front vibration damping sleeve 24 includes an annular cover structure that matches the motor reducer assembly 11, and a ring-shaped support lip 242 is provided at the bottom thereof, and a plurality of (four ribs are used as an example in the embodiment) inner recesses 241 that match the motor reducer assembly 11 are provided on the inner side thereof, which are used to support the motor reducer assembly 11 and the main housing 29. The front vibration damping sleeve 24 or the rear vibration damping sleeve 22 is made of EPDM. The vibration damping sleeve is matched with the front and rear end shapes of the motor reducer, and is lined between the motor and the main housing to isolate the vibration generated by the operation of the motor reducer assembly 11 from being transmitted to the main housing 29, thereby improving the overall operation sound quality.

[0041] like Figure 5c As shown, the motor bushing 12 and / or the lead screw bushing 164 are provided with a plurality of snap-fitting ribs (four in the embodiment) along the circumferential direction, and a groove 261 with pointed protrusions facing each other for limiting the snap-fitting ribs is provided in the lower housing 26. The square snap-fitting ribs of the lead screw bushing 164 and the motor bushing 12 are interference-fitted with the triangular snap-fitting ribs of the lower housing 26, thereby effectively fixing the lead screw bushing 164 and the motor bushing 12 in the axial and radial directions, and at the same time preventing the lead screw bushing 164 and the motor bushing 12 from rotating and moving in the lower housing 26.

[0042] The ball sleeve assembly 28 includes an upper ball seat assembly 285 matched with the spring end sleeve 271, and a lower ball seat assembly 283 matched with the lower shell 26. The lower ball seat assembly 283 includes a ball head bracket 282 with a positioning column and a buffer pad 281 located in the ball head bracket 282. The lower ball seat assembly 283 is fixed by a lower ball seat screw 284 limited in the lower shell 29.

[0043] The bend of the ball bracket 282 is provided with an outwardly convex positioning column 282a, and the lower shell 26 is provided with a left-right symmetrical slot 261, which cooperates with the positioning column 282a of the ball bracket 282 to meet the ball pin installation methods of different assembly directions. After the positioning column 282a is inserted into the slot 261, the ball bracket 282 can be prevented from rotating, thereby preventing the support rod from rotating around the axis after the ball head of the support rod is fixed to the ball pin of the vehicle body, thereby forming interference noise. A cushion pad 281 made of rubber is embedded in the ball pin on the ball bracket 282 to buffer, reduce vibration and silence, and prevent the installation of the ball pin and the ball bracket 282 from colliding and producing metal collision noise.

[0044] The number of components or structures mentioned in the text is only an example and is not intended to limit the actual protection scope of the present invention. Those skilled in the art should know that in actual production, the optimal number of components or structures should be selected by comprehensively considering the material composition of the selected parts, the process difficulty, and the processing cost.

[0045] The directional words mentioned in the text are based on the directions shown in the drawings and are not used to limit the actual product installation direction. For example, the front and rear vibration damping sleeves are based on the direction of the output shaft of the motor reducer assembly 11; the upper and lower ball seat components 283 and the lower shell 26 are based on the direction of the output shaft of the motor reducer assembly 11; Figure 2 The directions shown are for reference only.

[0046] Description of reference numerals:

[0047] 1. Drive components

[0048] 11 Motor reducer assembly

[0049] 12 Motor bushing

[0050] 13 Driving gear

[0051] 14 Transmission gear

[0052] 141 Drive shaft

[0053] 15 driven gear

[0054] 16 screw assembly

[0055] 161 Screw

[0056] 1611 screw gasket

[0057] 162 screw ring

[0058] 163 Screw nut

[0059] 1631O-type sealing ring

[0060] 164 Screw Bushing

[0061] 165 guide tube assembly

[0062] 1651 Guide tube

[0063] 1651a Guide tube plastic coating

[0064] 1652 Bushing

[0065] 166 bearing seat

[0066] 167 bearings

[0067] 2 Shell assembly

[0068] 21 Motor cover

[0069] 22 rear shock absorber

[0070] 221 main connecting bar

[0071] 222 side support ribs

[0072] 23 Cover screw

[0073] 24 front shock absorber

[0074] 241 concave part

[0075] 242 support lip

[0076] 25 Housing screw

[0077] 26 Lower shell

[0078] 261 card slot

[0079] 27 Extension spring

[0080] 271 spring end sleeve

[0081] 2711 external hexagonal structure

[0082] 28 ball sleeve assembly

[0083] 281 cushion

[0084] 282 ball head bracket

[0085] 282a Positioning column

[0086] 283 lower ball seat assembly

[0087] 284 lower ball seat screw

[0088] 285 upper ball seat assembly

[0089] 29 main shell

[0090] 291 tension spring connection

[0091] 292 Motor Installation

Claims

1. A car electric tailgate support rod mechanism, comprising a drive assembly (1) and a housing assembly (2), wherein the housing assembly (2) comprises a main housing (29) and a lower housing (26) which are separately arranged, and a motor cover (21), a tension spring (27) with a spring end sleeve (271) at the end, and a ball sleeve assembly (28), wherein the main housing (29) comprises a tension spring (27) connecting portion and a motor mounting portion (292) which are separately arranged on both sides; The drive assembly (1) comprises a motor reducer assembly (11) limited in a motor mounting portion (292), a lead screw assembly (16), a guide tube assembly (165), a bearing seat (166) limited in a main housing (29), and a bearing limited in the bearing seat (166); The lead screw assembly (16) comprises a lead screw (161) and a lead screw nut (163) located in a guide tube (1651), and the guide tube assembly (165) comprises a guide tube (1651) with a plastic coating (1651a) at one end thereof and limited in a main housing (29), characterized in that: The driving assembly (1) also includes a driving gear (13) directly bonded to the motor reducer assembly (11), a transmission gear (14) limited by a transmission shaft (141), and a driven gear (15) bonded to one end of a lead screw; a motor bushing (12) is sealed on the driving gear (13), and a lead screw bushing (164) is sealed on the driven gear (15); A front damping sleeve (24) matched with the driving gear (13) is provided at one end of the motor reducer assembly (11), and a rear damping sleeve (22) matched with the wiring assembly is provided at the other end, the rear damping sleeve comprising an annular portion matched with the outer edge of the motor, a main connecting rib (221) with a wiring port, and a plurality of side supporting ribs (222) arranged along the circumferential direction; The front vibration damping sleeve (24) comprises an annular cover structure matched with the motor reducer assembly (11), a bottom of which is provided with an annular supporting lip (242), and an inner side of which is provided with a plurality of inner recesses (241) matched with the motor reducer assembly (11); The motor bushing (12) and / or the lead screw bushing (164) are provided with a plurality of clamping ribs along the circumferential direction, and a clamping groove (261) provided with a pointed protrusion for limiting the clamping ribs is provided in the lower housing (26); The ball sleeve assembly (28) includes an upper ball seat assembly (285) matched with the spring end sleeve (271) and a lower ball seat assembly (283) matched with the lower shell (26); the lower ball seat assembly (283) includes a ball head bracket (282) with a positioning column and a buffer pad (281) located in the ball head bracket (282).

2. The electric tailgate support rod mechanism for a car according to claim 1, characterized in that: The front vibration damping sleeve (24) or the rear vibration damping sleeve (22) is made of EPDM.

Images