L-shaped electric supporting rod for automobile back door and assembling method thereof

Abstract

The application discloses an L-shaped electric supporting rod for a back door of an automobile and an assembling method thereof, which comprises a screw rod assembly, one end of the screw rod assembly is provided with a power input assembly, the power input assembly comprises a screw rod and a movable pipe, the movable pipe is integrally arranged with a nut of the screw rod, so as to drive the movable pipe and an upper ball socket assembly to be telescopic, the power input assembly comprises a motor, a worm on a flexible transmission of the motor output end, and a worm wheel which is engaged on an input section of the screw rod, the input section is provided with a transmission part and an interference part, the worm wheel is in transmission connection with the screw rod through the transmission part, the worm wheel is provided with an interference butt joint part which is engaged with the interference part, the interference butt joint part and the interference part are close to an output section of the screw rod, the transmission part corresponds to the engagement position of the worm and the worm wheel, the whole electric supporting rod is in an L shape, and is suitable for installation on a shorter installation area of a door sheet metal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile electric supporting rod, in particular to an L-shaped electric supporting rod for automobile back door and an assembling method thereof. BACKGROUND

[0002] At present, the automobile tail door electric supporting rod is mainly used for opening and closing the automobile tail door, which generally comprises a screw rod and a motor for driving the screw rod to rotate, and has an inner sleeve pipe and an outer sleeve pipe, the motor and the screw rod are located in the outer sleeve pipe, the inner sleeve pipe is connected to the sliding block of the screw rod and can be extended and retracted relative to the outer sleeve pipe, so as to realize the opening and closing of the automobile tail door.

[0003] In the extension and retraction process of the outer sleeve pipe, the screw rod and the transmission gear sleeved on the screw rod rely on the output torque of the motor to drive the transmission gear, the transmission gear is assembled on the screw rod shaft and generally adopts spline joint to realize synchronous rotation, therefore, there is an assembly gap between the transmission gear and the screw rod shaft, which will cause the transmission gear to exist in the axial deflection and movement during the extension and retraction process, resulting in the clear and crisp click collision sound in the electric supporting rod, which is amplified through the metal sheet of the automobile back door, affecting the normal use, and in order to ensure the structural strength, the transmission gear and the screw rod shaft are made of metal material, if the transmission gear and the screw rod shaft are tightly matched, the torque between the metal parts is too large, which will easily cause the screw rod shaft to be bent, affecting the smoothness of the extension and retraction action and the normal use of the electric supporting rod.

[0004] In addition, the noise and vibration of the electric supporting rod also exist in the deflection of the motor output shaft, the deflection and vibration of the screw rod and the upper ball socket assembly, and the deflection and vibration of the screw rod nut, and at the same time, the electric supporting rod in the prior art needs to be pre-assembled with the spring, and the spring always applies a separating force, which is not convenient for assembly. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide an L-shaped electric supporting rod for automobile back door,

[0006] The above technical purpose of the present application is realized by the following technical scheme: an L-shaped electric supporting rod for automobile back door, comprising: a bearing seat, a guide pipe is fixedly arranged on the bearing seat, a screw rod assembly is arranged in the guide pipe, a power input assembly is connected to one end of the screw rod assembly, an upper ball socket assembly is connected to the other end of the screw rod assembly, and the guide pipe restricts the axial track of the screw rod assembly.

[0007] The screw rod assembly comprises a screw rod and a movable pipe, the movable pipe is integrally arranged with the nut of the screw rod to drive the movable pipe and the upper ball socket assembly to extend and retract.

[0008] A housing is fixedly connected with the bearing seat and contains the power input assembly, the axis of the power input assembly is perpendicular to the axis of the lead screw, the input section of the lead screw is arranged in the housing and is in transmission connection with the power input assembly,

[0009] A spring is arranged in the screw groove of the upper ball socket assembly.

[0010] The power input assembly comprises a motor, a worm arranged on the output end of the motor in a flexible transmission mode, and a worm wheel engaged with the input section of the lead screw, the input section is provided with a transmission part and an interference part, the worm wheel is in transmission connection with the lead screw through the transmission part, the worm wheel is provided with an interference butt joint part engaged with the interference part, the interference butt joint part and the interference part are close to the output section of the lead screw, and the transmission part corresponds to the engagement position of the worm and the worm wheel.

[0011] Further, the worm wheel comprises a sleeve and a connecting piece arranged on the input section of the lead screw, and a transmission wheel integrally formed on the connecting piece, the connecting piece is provided with an annular body corresponding to the spline part, the interference butt joint part is arranged on the connecting piece, and a plurality of through holes are arranged on the annular body in the circumferential direction.

[0012] Further, the interference part comprises an interference amount and a guide amount, the ratio of the interference amount to the guide amount is 2-2.5, and the ratio of the length of the interference part to the interference outer diameter is 2:1.5.

[0013] Further, the output end of the motor is provided with a first adapter, the worm is provided with a second adapter, the end of the worm is in plug-in transmission connection with the middle part of the second adapter, and the first adapter is in plug-in transmission connection with the second adapter in the circumferential direction.

[0014] Further, a transmission seat is arranged between the output end face of the motor and the housing, a first soft pad is in abutment between the transmission seat and the housing, a second soft pad is embedded in the tail end of the motor and is in abutment with the housing, the first soft pad has an axial and radial extension, the transmission seat receives a first bearing on the worm, and the first adapter and the second adapter are contained in the transmission seat.

[0015] Further, the spring is a tower spring, and the screw groove has an open end for placing the tower spring, and the open end is provided with a slope matched with the tower spring.

[0016] Further, a first limiting structure is arranged between the end of the movable pipe and the upper ball socket assembly, and the first limiting structure allows the movable pipe and the upper ball socket assembly to rotate relative to each other.

[0017] The second limiting structure is arranged between the bearing seat and the guide pipe, and limits the movable pipe from being separated from the upper ball socket assembly and prevents the guide pipe from moving axially and rotating;

[0018] The electric support rod has an assembled state through the first limiting structure and the second limiting structure, in which the bearing seat, the screw rod assembly and the upper ball socket assembly are prevented from being separated from each other, and the input section of the screw rod is extended out of the bearing seat and is allowed to be further extended out of the bearing seat by rotating.

[0019] Further, the upper ball socket assembly comprises a bearing seat, a receiving member arranged axially in the bearing seat, and a ball socket seat fixed to one end of the receiving member, the receiving member is connected to the movable pipe through the first limiting structure at one end, and the other end of the receiving member is extended out of the bearing seat and fixedly connected to the ball socket seat.

[0020] The first limiting structure comprises a rivet groove arranged at one end of the receiving member, and first and second limiting portions arranged at both sides of the end of the receiving member, the receiving member and the bearing seat are prevented from being separated from each other in the first direction through the first limiting portion, and the bearing seat and the ball socket seat are prevented from being separated from each other in the second direction through the second limiting portion.

[0021] Further, the second limiting structure comprises a limiting convex portion arranged on the inner wall of the bearing seat, a limiting hole arranged on the guide pipe, and a second bearing arranged in the bearing seat, the second bearing limits the limiting nut in the initial position, the limiting convex portions are arranged along the axial direction at intervals, and the limiting convex portions are arranged corresponding to the limiting holes.

[0022] Compared with the prior art, the present application has the following advantages and beneficial effects: 1. The screw rod and the motor are connected through the worm gear structure to realize transmission, the worm gear provides a reduction effect, thereby reducing the occupied space of the reduction box, the screw rod axis is perpendicular to the motor axis, the overall electric support rod is L-shaped, and is suitable for installation in a short installation area on a vehicle door panel;

[0023] 2. The axial position of the screw rod and the worm gear is limited through the interference portion, thereby avoiding the deflection and collision caused by the gap between the screw rod and the worm gear, and the spline is used as a transmission portion to realize synchronous rotation;

[0024] 3. The output end of the screw rod assembly and the upper ball socket assembly are prevented from being separated through the first limiting structure, the input end of the screw rod assembly is prevented from being separated on the bearing seat through the second limiting structure, the screw rod assembly, the upper ball socket assembly and the bearing seat form an independent module which is limited and prevented from being separated from each other, the input end of the screw rod is extended out of the bearing seat, the installation of the worm gear transmission system is simplified, the separation between the screw rod assembly and the upper ball socket assembly and the bearing seat is not considered during the assembly process, the screw rod is further extended by rotating the input end of the screw rod, and the worm gear is assembled on the interference portion of the input section of the screw rod.

[0025] The application also provides an assembly method of the L-shaped electric supporting rod for the automobile back door, comprising the following steps:

[0026] S1, pre-assemble the screw rod assembly, integrally form the screw rod nut on the movable pipe, and form the built-in nut body part and the external nut guide part at the end of the movable pipe, screw the screw rod into the nut and into the movable pipe;

[0027] S2, assemble the bearing seat, integrally form the guide pipe on the limiting convex part of the bearing seat, and set the first bearing at the initial end position of the screw rod nut on the bearing seat to limit the screw rod assembly from being translated out of the upper ball socket assembly, at this time, the input section of the screw rod is out of the bearing seat;

[0028] S3, assemble the upper ball socket assembly and the spring, push the screw rod and drive the other end of the movable pipe to extend out of the guide pipe, screw the receiving part of the upper ball socket assembly on the riveting end of the movable pipe, fit one end of the spring into the screw groove on the bearing seat, and fit the other end of the spring into the screw groove on the bearing seat, resist the spring and press the bearing seat to the first limiting part of the receiving part, engage the metal insert in the ball socket seat of the upper ball socket assembly with the screw rod on the receiving seat, and set the stop ring between the ball socket seat and the bearing seat as the second limiting part of the receiving part, at this time, the upper ball socket assembly is prevented from being separated from the movable pipe, and the spring is limited between the upper ball socket assembly and the bearing seat in the initial posture;

[0029] S4, assemble the front shell, embed the second bearing on the end face of the front shell, and position the front shell through the screw rod input section and the bearing seat, and clamp the limiting part on the screw rod input section to limit the front shell from being separated;

[0030] S5, assemble the power input assembly, sequentially connect the motor, the transmission seat on the output end thereof, the first adapter, the second adapter and the worm, and then set them in the inner cavity of the front shell, and cover the end cover on the tail of the front shell;

[0031] S6, assemble the worm wheel, rotate the screw rod, force the screw rod input section to further extend out of the bearing seat, and press fit the worm wheel to the interference part of the input section, at this time, the worm wheel is engaged with the transmission part on the screw rod input section, rotate the screw rod in the reverse direction, adjust the cooperation between the worm wheel and the worm, and the end of the guide pipe is adjacent to the first limiting part of the receiving part;

[0032] S7, assemble the rear shell, tightly fit the damper in the locked part, press fit the locked part to the front shell, engage the toothed positioning ring on the locked part and the front shell, and the input section of the screw rod is engaged into the damper, press fit the locked part to the front shell and the locked part, the locking inclined surface of the locked part and the locked part are abutted, pass the bolt through the front shell, the rear shell and the bearing seat, and lock by the nut. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A cross-sectional view of the screw rod and the worm gear of the present application;

[0034] Figure 2 A schematic view of the screw rod and the worm gear of the present application;

[0035] Figure 3 An exploded view of the connecting piece and the transmission wheel of the present application;

[0036] Figure 4 A cross-sectional view of the connecting piece of the present application;

[0037] Figure 5 A cross-sectional view of the worm gear and the worm inside the housing of the present application;

[0038] Figure 6 A cross-sectional view of the housing and the motor of the present application;

[0039] Figure 7 An exploded view of the worm and the first and second adapters of the present application;

[0040] Figure 8 A cross-sectional view of the support rod of the present application;

[0041] Figure 9 A schematic view of the upper ball socket assembly of the present application;

[0042] Figure 10 An exploded view of the screw rod assembly of the present application;

[0043] Figure 11 An exploded view of the housing and the bearing seat of the present application;

[0044] Figure 12 Another exploded view of the housing and the bearing seat of the present application;

[0045] Figure 13 A Figure 8 An enlarged view of A in the figure;

[0046] In the figure: 1, bearing seat; 1.1, limiting protrusion; 1.2, second bearing; 1.3, metal nut piece;

[0047] 2, guide pipe; 2.1, limiting hole site; 2.2, guide groove;

[0048] 3, screw rod assembly; 3.1, screw rod; 3.11, input section; 3.12, transmission site; 3.13, interference site; 3.131, guide vector; 3.132, interference amount; 3.14, limiting groove; 3.15, output section; 3.2, movable pipe; 3.3, nut; 3.31, guide protrusion;

[0049] 4, ball socket assembly; 4.1, socket; 4.2, socket connector; 4.21, spin rivet part; 4.22, screw; 4.23, through part; 4.24, spin rivet groove; 4.25, first limiting part; 4.26, second limiting part; 4.3, ball socket; 4.31, metal insert;

[0050] 5, power input assembly; 5.1, motor; 5.2, worm; 5.21, transmission convex part; 5.3, worm gear; 5.31, connecting piece; 5.311, annular body; 5.312, through hole; 5.313, interference butt joint part; 5.32, transmission wheel; 5.4, first adapter; 5.41, forked connecting part; 5.5, second adapter; 5.51, first plug-in groove; 5.51, second plug-in groove; 5.6, transmission seat; 5.7, first soft pad; 5.71, extension part; 5.8, second soft pad; 5.81, embedded part; 5.82, bulge part; 5.9, first bearing;

[0051] 6, housing; 6.1, front shell; 6.2, rear shell; 6.21, locking part; 6.22, locked part; 6.221, radial stop edge; 6.222, ring convex; 6.3, tooth positioning ring; 6.4, locking inclined surface; 6.5, stepped groove;

[0052] 7, spring; 7.1, helical groove; 7.2, open end; 7.3, inclined surface;

[0053] 8, limiting piece; 9, third bearing; 10, bolt; 11, end corner part; 12, damper; 13, lower ball socket assembly; DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0055] It should be understood that although the terms upper, middle, lower, top end, one end, etc. appear in the text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for the purpose of understanding, and are not used to define any direction or sequence limitation.

[0056] As Figures 1-13As shown, an L-shaped electric supporting rod for a car back door comprises a bearing seat 1, a guide pipe 2 fixedly arranged in the bearing seat 1, a screw rod assembly 3 arranged in the guide pipe 2, a power input assembly 5 connected to one end of the screw rod assembly 3, and an upper ball socket assembly 4 connected to the other end of the screw rod assembly 3; the guide pipe 2 restricts the axial trajectory of the screw rod assembly 3;

[0057] The screw rod assembly 3 comprises a screw rod 3.1 and a movable pipe 3.2, the movable pipe 3.2 is integrally arranged with a nut 3.3 of the screw rod 3.1 to drive the movable pipe 3.2 and the upper ball socket assembly 4 to extend and retract;

[0058] A shell 6 is fixedly connected with the bearing seat 1 and accommodates the power input assembly 5, an axis of the power input assembly 5 is arranged perpendicularly to an axis of the screw rod 3.1, an input section 3.11 of the screw rod 3.1 extends out of the bearing seat 1 and is arranged in the shell 6, so that the input section 3.11 of the screw rod 3.1 is in transmission connection with the power input assembly 5;

[0059] A spring 7 is arranged on the bearing seat 1 and the upper ball socket assembly 4, and a helical groove 7.1 matched with the spring 7 is arranged on the bearing seat 1 and the upper ball socket assembly 4, so that two ends of the spring 7 are respectively limited on the bearing seat 1 and the upper ball socket assembly 4;

[0060] The power input assembly 5 comprises a motor 5.1, a flexible transmission worm 5.2 arranged on an output end of the motor 5.1, and a worm wheel 5.3 engaged on the input section 3.11 of the screw rod 3.1, the motor 5.1, the worm 5.2 and the worm wheel 5.3 are arranged in the shell 6,

[0061] As shown in Figure 1 、 Figure 2 and Figure 4 , the input section 3.11 of the screw rod 3.1 is provided with a transmission part 3.12 and an interference part 3.13, the worm wheel 5.3 is in transmission connection with the screw rod 3.1 through the transmission part 3.12, and the transmission part 3.12 is a spline, the worm wheel 5.3 is provided with an interference butt joint part 5.313 engaged with the interference part 3.13, the interference butt joint part 5.313 and the interference part 3.13 are close to an output section 3.15 of the screw rod 3.1, and the transmission part 3.12 corresponds to the engagement position of the worm 5.2 and the worm wheel 5.3.

[0062] In the embodiment, the interference part 3.13 on the input section 3.11 of the screw rod 3.1 and the interference butt joint part 5.313 on the worm wheel 5.3 are tightly matched to limit the axial position and cancel the assembly gap of the worm wheel 5.3 on the input section 3.11 of the screw rod 3.1, so as to reduce or avoid the yaw and radial runout between the two.

[0063] Specifically, the worm gear 5.3 comprises a sleeve and a connecting piece 5.31 on the input section 3.11 of the lead screw 3.1, and a transmission wheel 5.32 integrally formed on the connecting piece 5.31, the connecting piece 5.31 is provided with an annular body 5.311 corresponding to the spline part, and an interference joint part 5.313 is formed on the connecting piece 5.31, a plurality of through holes 5.312 are provided on the annular body 5.311 about the circumference, and the transmission wheel 5.32 is tightly connected with the annular body 5.311 through the through holes 5.312.

[0064] As shown in Figure 3 , the transmission wheel 5.32 is integrally injection molded on the connecting piece 5.31, the connecting piece 5.31 and the lead screw 3.1 are metal parts to ensure the structural strength of the torque transmission part, the transmission gear is divided into the connecting piece 5.31 at the middle shaft position and the transmission wheel 5.32 formed on the connecting piece 5.31, the torque is input by the transmission wheel 5.32, and the power is output to the lead screw 3.1 through the connecting piece 5.31, thereby driving the lead screw 3.1 to rotate, the connecting piece 5.31 is made of metal and connected with the lead screw 3.1, and the transmission wheel 5.32 can be made of plastic to reduce the cost and realize the lightweight of the transmission part 3.12.

[0065] As a further embodiment of the connecting piece 5.31 and the transmission wheel 5.32, the connecting piece 5.31 is provided with an annular body 5.311 corresponding to the transmission connection part, the annular body 5.311 is away from the interference joint part, the transmission wheel 5.32 is integrally embedded in the annular body 5.311 and the connecting piece 5.31, and the annular body 5.311 provides a joint part for the transmission wheel 5.32 embedded in the connecting piece 5.31, thereby improving the integrity of the transmission wheel 5.32 and the connecting piece 5.31.

[0066] Specifically, a plurality of through holes 5.312 are provided on the annular body 5.311 about the circumference, and the transmission wheel 5.32 is tightly connected with the annular body 5.311 through the through holes 5.312.

[0067] Specifically, the transmission wheel 5.32 is extended on the front and rear end faces of the annular body 5.311, has an extension part 5.71 about the radial direction of the annular body 5.311, and the flow material can pass through the through holes 5.312 to the front and rear end faces of the annular body 5.311, so that the transmission wheel 5.32 is tightly connected with the connecting piece 5.31, and the worm gear 5.3 is formed as a whole.

[0068] It should be noted that the transmission wheel 5.32 is not limited to the worm gear 5.3, but can also be other transmission members capable of transmitting torque with the lead screw 3.1, such as a spur gear.

[0069] As preferred, the interference part 3.13 is arranged between the transmission part 3.12 and the output section 3.15 of the screw rod 3.1, so that the connecting piece 5.31 is in interference fit with the screw rod 3.1 in the assembly direction, and optionally, an external tool is used to apply a force of 1000N to the interference fit part 5.313, so that the screw rod 3.1 and the connecting piece 5.31 are in reliable and stable fit.

[0070] As can be seen from Figure 1 As can be seen from

[0071] Specifically, the input section 3.11 of the screw rod 3.1 is provided with a limiting groove 3.14, and the limiting piece 8 is clamped in the limiting groove 3.14 and abuts against the end of the connecting piece 5.31 in the axial first direction, wherein the limiting piece 8 can be a limiting ring, and another purpose of the limiting piece 8 is to limit the position of the screw rod 3.1 in the axial first direction, so as to prevent the screw rod 3.1 from being pulled out in the first direction.

[0072] As preferred, the axial length of the transmission part 3.12 on the input section 3.11 of the screw rod 3.1 is D1, and the axial length of the interference fit part 5.313 on the input section 3.11 of the screw rod 3.1 is D2, wherein the transmission part 3.12 covers the projection of the transmission wheel 5.32 in the radial direction, and the ratio of D1 to D2 satisfies 2-2.85.

[0073] It should be noted that the transmission part 3.12 is not limited to splines, but can also be a non-circular driving angle that can form transmission, such as a straight key or a polygonal key.

[0074] Specifically, the outer diameter of the transmission part 3.12 is smaller than the outer diameter of the interference part 3.13, the interference fit between the interference part 3.13 and the interference fit part 5.313 is set by the outer diameters therebetween, and the interference part 3.13 and the interference fit part 5.313 are oppositely provided with a guide bevel, and the interference part 3.13 includes an interference amount 3.132 and a guide amount 3.131 arranged in the axial direction, the interference part 3.13 is first inserted with the guide amount 3.131, and under the premise that the input section 3.11 of the screw rod 3.1 and the transmission part 3.12 of the worm wheel 5.3 are matched, the interference part 3.13 and the interference fit part 5.313 are further guided to ensure the concentricity between the worm wheel 5.3 and the input section 3.11 of the screw rod 3.1.

[0075] Optionally, the ratio of interference 3.132 to guide 3.131 is 2 to 2.5, and the ratio of the length of the interference part 3.13 to its interference outer diameter is 2:1.5. For example, the length of the interference part 3.13 is 4.5 mm and its outer diameter is 6 mm. The interference 3.132 and guide 3.131 are selected according to the outer diameters of the interference part 3.13 and the interference mating part 5.313.

[0076] Additionally, the end face of the limiting member 8 abuts against the connecting member 5.31 of the worm gear 5.3 to provide an interference fit. By setting the interference amount 3.132 and the guide amount 3.131 on the same interference part 3.13, the bearing pressure of the limiting member 8 is relatively reduced, effectively preventing damage to the limiting member 8 during the assembly process. At the same time, it also serves as a guide for the docking of the worm gear 5.3 with the input section 3.11 of the lead screw 3.1.

[0077] In this embodiment, the worm gear 5.3 is constrained to move within the housing 6. A gap is provided on any surface of the housing 6 corresponding to the worm gear 5.3 to avoid noise caused by vibration when the worm gear 5.3 contacts the inner wall of the housing 6.

[0078] (Motor 5.1 - Worm Gear 5.2 transmission)

[0079] like Figures 5 to 7 As shown, in some other embodiments, further improvements are made to the motor 5.1 to address the noise issue in the transmission system formed by the motor 5.1 and the worm gear 5.3. A first adapter 5.4 is provided on the output end of the motor 5.1, and a second adapter 5.5 is provided on the worm gear 5.2.

[0080] The worm 5.2 is inserted into the middle of the second adapter 5.5 for transmission. The first adapter 5.4 is inserted into the periphery of the second adapter 5.5 for transmission. The first adapter 5.4 is fixedly fitted to the output end of the motor 5.1 and has a fork-shaped connecting part. The second adapter 5.5 has a first insertion groove 5.51 corresponding to the fork-shaped connecting part 5.41, and a second insertion groove 5.51 arranged in the middle of the first insertion groove 5.51. The end of the worm 5.2 is provided with a straight transmission protrusion 5.21. 5.21 is inserted into the second insertion slot 5.51, and the first adapter 5.4, the second adapter 5.5 and the transmission protrusion 5.21 on the end of the worm 5.2 are all abutted and connected to each other, so as to realize the stable transmission of the transmission system between the motor 5.1 and the worm 5.2. Through the above improvements, the first adapter 5.4 and the second adapter 5.5 realize the flexible connection between the output end of the motor 5.1 and the worm 5.2, effectively eliminating the radial movement of the output shaft of the motor 5.1 and reducing the impact of concentricity.

[0081] Both the first adapter 5.4 and the second adapter 5.5 are flexible components.

[0082] (Motor 5.1 - Housing 6 installation)

[0083] With continued reference to Figures 5 to 7 In some other embodiments, further improvements are made to the motor 5.1 to address the noise of the motor 5.1 in the housing 6. Specifically, a transmission seat 5.6 is provided between the output end face of the motor 5.1 and the housing 6, a first soft pad 5.7 is provided between the transmission seat 5.6 and the housing 6, a second soft pad 5.8 is provided between the tail end of the motor 5.1 and the housing 6, the transmission seat 5.6 receives a first bearing 5.9 on the worm 5.2, and the first adapter 5.4 and the second adapter 5.5 are both accommodated in the transmission seat 5.6.

[0084] The first soft pad 5.7 has axial and radial extensions 5.71, and the cross section of the first soft pad 5.7 is L-shaped, so that the end face of the transmission seat 5.6 is limited in the axial and radial directions by the first soft pad 5.7. The first soft pad 5.7 and the second soft pad 5.8 eliminate the play between the motor 5.1 and the housing 6.

[0085] The second soft pad 5.8 has an embedded portion 5.81 embedded in the motor 5.1, and a ring portion surrounding the outer surface of the motor 5.1, the ring portion having a radially outwardly extending bulge 5.82, the ring portion and the bulge 5.82 of the second soft pad 5.8 abutting the inner surface of the housing 6, thereby eliminating the play of the tail of the motor 5.1 in the housing 6.

[0086] With the above improvements, the first soft pad 5.7 and the second soft pad 5.8 arranged in front and back provide a tight fit and limit for the motor 5.1 in the housing 6, to reduce and prevent the noise caused by the motor 5.1 shaking in the housing 6. In addition, by limiting the position of the motor 5.1, it is also beneficial to reduce the yaw between the output shaft of the motor 5.1 and the worm 5.2, and to achieve the quietness of the overall transmission system.

[0087] Due to the different directions of the force exerted by the worm gear 5.3 on the worm 5.2 when the movable tube 3.2 is extended and retracted, the yaw of the worm 5.2 at its two ends produces different periodic noises. Therefore, in this embodiment, the end of the worm 5.2 away from the motor 5.1 is interference connected with the housing 6 through the shaft sleeve, the control pressure is above 25N, and the other end of the worm 5.2 is engaged with the inner ring of the first bearing 5.9.

[0088] (Spring 7)

[0089] As a further embodiment of the spring 7, the spring 7 is a tower-shaped spring 7, and the spiral groove 7.1 has an open end 7.2 for the tower-shaped spring 7 to be inserted. The two open ends 7.2 are arranged opposite to each other. The open end 7.2 is provided with an inclined surface 7.3 that matches the tower-shaped spring 7. The inclined surface 7.3 further eliminates the interference between the tower-shaped spring 7 and the open end 7.2 of the spiral groove 7.1.

[0090] (First limiting structure and second limiting structure)

[0091] like Figures 8 to 10 As shown, in this embodiment, a first limiting structure is provided between the end of the movable tube 3.2 and the upper ball socket assembly 4. The first limiting structure prevents the end of the movable tube 3.2 from detaching from the upper ball socket assembly 4. The first limiting structure also allows the movable tube 3.2 and the upper ball socket assembly 4 to rotate relative to each other, so that when the movable tube 3.2 rotates during the assembly process, it rotates relative to the upper ball socket assembly 4 to avoid jamming.

[0092] A second limiting structure is provided between the bearing housing 1 and the guide tube 2, and the second limiting structure restricts the movable tube 3.2 from dislodging from the upper ball socket assembly 4 and prevents the guide tube 2 from moving and rotating axially;

[0093] The electric strut is in an assembled state via the first and second limiting structures. In the assembled state, the spring 7 is limited in the spiral groove 7.1 between the bearing seat 1 and the upper ball socket assembly 4. The bearing seat 1, the lead screw assembly 3, and the upper ball socket assembly 4 are mutually anti-detached, and the input section 3.11 of the lead screw 3.1 extends out of the bearing seat 1, and the lead screw 3.1 is allowed to continue to extend out of the bearing seat 1 by rotation.

[0094] (Upper ball socket assembly 4)

[0095] As a further embodiment of the upper ball socket assembly 4, the upper ball socket assembly 4 includes: a bearing 4.1, a receiving member 4.2 axially arranged within the bearing 4.1, and a ball socket seat 4.3 fixed to one end of the receiving member 4.2. The bearing 4.1 is provided with a spiral groove 7.1 for limiting the end of the spring 7. The receiving member 4.2 is generally cylindrical. One end of the receiving member 4.2 is engaged with the movable tube 3.2 through a first limiting structure, and the other end of the receiving member 4.2 extends out of the bearing 4.1 and is fixedly connected to the ball socket seat 4.3.

[0096] Specifically, one end of the adapter 4.2 extends into the movable tube 3.2 to form a spin rivet portion 4.21, the other end of the adapter 4.2 has a screw rod 4.22, and the middle part of the adapter 4.2 passes through the bearing 4.1 to form a passing portion 4.23; the ball socket 4.3 includes an integral embedded metal insert 4.31, the outer ball socket 4.3 body of the metal insert 4.31 is a plastic part, and the metal insert 4.31 is a nut 3.3 part used for threaded connection with the screw rod 4.22, so as to press in the first direction and limit the bearing 4.1 between the ball socket 4.3 and the adapter 4.2.

[0097] (Prevent the movable tube 3.2 from being separated from the adapter 4.2)

[0098] The first limiting structure includes a spin rivet groove 4.24 arranged on the spin rivet portion 4.21 at one end of the adapter 4.2, and the movable tube 3.2 is pressed into the spin rivet groove 4.24 by spin riveting, so as to prevent the upper ball socket assembly 4 from being separated from the adapter 4.2 and the movable tube 3.2.

[0099] The first limiting structure further includes a first limiting portion 4.25 and a second limiting portion 4.26 formed on both sides of the end of the adapter 4.2,

[0100] (Prevent the adapter 4.2 from being separated from the bearing 4.1)

[0101] The first limiting portion 4.25 is a shoulder arranged between the passing portion 4.23 and the spin rivet portion 4.21, and the shoulder is located between the bearing 4.1 and the movable tube 3.2, or between the bearing 4.1 and the guide tube 2, so as to limit the adapter 4.2 from being separated from the bearing 4.1 in the first direction, and the upper ball socket assembly 4 drives the bearing 4.1 to extend outwards through the first limiting portion 4.25.

[0102] (Prevent the ball socket 4.3 from being separated from the adapter 4.2)

[0103] The second limiting portion 4.26 is a retaining ring clamped on the adapter 4.2, and the retaining ring is abutted between the ball socket 4.3 and the bearing 4.1, so as to limit the bearing 4.1 from being separated from the ball socket 4.3 in the second direction, and the movable tube 3.2 is retracted by pulling the adapter 4.2 and the ball socket 4.3, and the ball socket 4.3 pulls the bearing 4.1 to retract by the retaining ring.

[0104] (Prevent the bearing seat 1 from being separated from the guide tube 2)

[0105] The second limiting structure includes a limiting protrusion 1.1 on the inner wall of the bearing housing 1 and a limiting hole 2.1 on the guide tube 2. The limiting protrusion 1.1 is arranged around the axis of the bearing housing 1, which means that the limiting protrusion 1.1 is spaced apart in both the axial and circumferential directions. The limiting protrusion 1.1 and the limiting hole 2.1 are arranged correspondingly to limit the end of the guide tube 2 away from the upper ball socket assembly 4 on the bearing housing 1, thereby preventing the guide tube 2 from detaching.

[0106] Among them, the guide tube 2 can be integrally formed on the bearing seat 1.

[0107] (Preventing the lead screw assembly 3 from detaching from the bearing housing 1)

[0108] The second limiting structure also includes a second bearing 1.2 disposed in the bearing housing 1. The second bearing 1.2 is adjacent to the limiting protrusion 1.1. The second bearing 1.2 limits the nut 3.3 to the initial position to prevent the lead screw 3.1 and its nut 3.3 from coming out of the bearing housing 1 away from the direction of the upper ball socket assembly 4.

[0109] The housing 6 is equipped with a third bearing 9 corresponding to the second bearing 1.2. One side of the third bearing 9 is limited by the end face of the bearing seat 1, and the other side of the third bearing 9 is limited by the end face of the housing 6. At the same time, the limiting member 8 is engaged and stopped at the inner ring of the third bearing 9. Thus, the limiting and anti-disengagement of the lead screw 3.1 in the direction toward the upper ball socket assembly 4 is completed.

[0110] (Shell 6)

[0111] like Figures 11 to 13 As shown, as a further embodiment of housing 6, housing 6 includes a front housing 6.1 closed on bearing housing 1 and a rear housing 6.2 closed on front housing 6.1. Bearing housing 1, front housing 6.1 and rear housing 6.2 are locked together by bolts 10. The joint end face of front housing 6.1 and bearing housing 1 is provided with a groove for accommodating third bearing 9. Limiting member 8 is arranged on one side adjacent to the groove, and the opening of the groove allows limiting member 8 to enter axially and engage with the input section 3.11 of lead screw 3.1 during assembly. The front housing 6.1 and rear housing 6.2 are closed to form a transmission cavity for accommodating power input assembly 5.

[0112] By separating the front housing 6.1 and the rear housing 6.2, after assembling the bearing housing 1, the lead screw assembly 3, and the upper ball socket assembly 4, the input section 3.11 of the lead screw 3.1 is in an assembly state that extends out of the bearing housing 1. At this time, the third bearing 9, the limiting member 8, and the front housing 6.1 can be placed directly on the bearing housing 1, and the mating opening of the front housing 6.1 facing the rear housing 6.2 allows the worm gear 5.3 to enter axially during assembly.

[0113] As a way of connecting the bearing seat 1 with the front shell 6.1, a metal nut 3.3 piece 1.3 is embedded in the bearing seat 1, and the bolt 10 enters from the rear shell 6.2 side and is further fixed and connected by the nut after being screwed through the metal nut 3.3 piece 1.3.

[0114] In some working conditions, the metal nut 3.3 piece 1.3 deforms due to high temperature creep, which is not conducive to the torque between the bolt 10 and the metal nut 3.3 piece 1.3, resulting in unstable locking between the shell 6 and the bearing seat 1. For this situation, the bearing seat 1 and the shell 6 extend out of the end corner part 11 on the outer contour side, and the metal nut 3.3 piece 1.3 is embedded in the end corner part 11, wherein the number of bolts 10 and end corner parts 11 is five, and they are arranged in the circumferential direction around the transmission cavity and contain the worm 5.2 in its axial projection.

[0115] As another improvement to the shell 6, the rear shell 6.2 includes a locking portion 6.21 and a locked portion 6.22;

[0116] The locking portion 6.21 has the end corner part 11 formed thereon and the bolt 10 passes through it;

[0117] The locked portion 6.22 has a lower ball socket assembly 13 formed thereon and a damper 12 fitted thereon, the damper 12 is coaxially arranged with the lead screw 3.1, and the input section 3.11 of the lead screw 3.1 passes through the damper 12 and is engaged with the damping assembly inside the damper 12, and the input section 3.11 of the lead screw 3.1 is rotatably engaged with the locked portion 6.22.

[0118] The locked portion 6.22 and the front shell 6.1 are provided with relatively arranged tooth positioning rings 6.3, and the two are axially positioned by the tooth positioning ring 6.3, and the locked portion 6.22 has a radial stop edge 6.221 extending into the inner wall of the front shell 6.1, so that the locked portion 6.22 is fixed in an axially and radially limited state after the locking portion 6.21 exerts a force on the locked portion 6.22, which is conducive to the concentricity between the damper 12 and the input section 3.11 of the lead screw 3.1 to exert a stable and reliable damping force on the lead screw 3.1.

[0119] To further improve the stability of the locked portion 6.22 in the assembled state, the locked portion 6.22 and the locking portion 6.21 have locking inclined surfaces 7.36.4 formed on the facing ends, which further increase the engagement area between the two, and as the bolt 10 is tightened, the two locking inclined surfaces 7.36.4 gradually fit closely.

[0120] Further, the locked portion 6.22 is provided with a ring protrusion 6.222 facing the front shell 6.1 and the locked portion 6.21 in a radial direction, and the locked portion 6.21 and the front shell 6.1 are provided with a stepped groove 6.5 matched with the ring protrusion 6.222, so that the integrity of the locked portion 6.22, the front shell 6.1 and the locked portion 6.21 is further improved.

[0121] During the assembly of the bearing seat 1 and the front shell 6.1, the bearing seat 1 is placed first, and then the worm wheel 5.3 is pressed and assembled, so that the bearing seat 1 and the front shell 6.1 are positioned in the form of rotation stopping, and for this purpose, a rotation stopping protrusion is arranged on an end surface of the front shell 6.1 facing the bearing seat 1, and a rotation stopping groove is arranged on an end surface of the bearing seat 1 facing the front shell 6.1, and meanwhile, a reinforcing rib is arranged on the rotation stopping protrusion, so as to ensure the rotation stopping strength between the bearing seat 1 and the front shell 6.1.

[0122] As an option, a non-circular outer shape can be adopted between the rotation stopping protrusion and the rotation stopping groove, and preferably, flat cutting surfaces are arranged on both sides of the rotation stopping protrusion, and the flat cutting surfaces extend in a vertical direction, so that the rotation stopping protrusion is close to a rectangle and has a circular arc segment.

[0123] The application further provides an assembly method of the L-shaped electric supporting rod for the back door of the automobile, which comprises the following steps:

[0124] S1, pre-assemble the screw rod assembly 3, integrally form the screw rod 3.1 nut 3.3 on the movable tube 3.2, and form an embedded nut 3.3 main body part and an external nut 3.3 guide part at the end of the movable tube 3.2, screw the screw rod 3.1 into the nut 3.3 and into the movable tube 3.2;

[0125] S2, assemble the bearing seat 1, integrally form the guide tube 2 on the limiting protrusion 1.1 of the bearing seat 1, and enter step S3.1 or step S3.2;

[0126] S3.1, assemble the upper ball socket assembly 4 and the spring 7, push the screw rod 3.1 and drive the other end of the movable tube 3.2 to extend out of the guide tube 2, screw the upper ball socket assembly 4 receiving piece 4.2 on the other end of the movable tube 3.2, put one end of the spring 7 into the screw groove 7.1 on the bearing seat 1, and put the other end of the spring 7 into the screw groove 7.1 on the bearing seat 4.1, resist the spring 7 and press the bearing seat 4.1 to the first limiting part 4.25 of the receiving piece 4.2, engage the metal insert 4.31 in the ball socket seat 4.3 of the upper ball socket assembly 4 with the screw 4.22 on the receiving seat, and set the stop ring between the ball socket seat 4.3 and the bearing seat 4.1 as the second limiting part 4.26 on the receiving piece 4.2, at this time, the upper ball socket assembly 4 is prevented from being detached from the movable tube 3.2, the spring 7 is limited between the upper ball socket assembly 4 and the bearing seat 1 in a posture close to the initial one, the screw rod is pulled back during the assembly of the upper ball socket assembly and extends out of the bearing seat, and then enters step S3.4;

[0127] S3.2, the upper ball socket assembly 4 is assembled with the spring 7, the adapter 4.2 of the upper ball socket assembly 4 is riveted on the other end of the movable pipe 3.2, one end of the spring 7 is matched into the screw groove 7.1 on the bearing seat 1, the other end of the spring 7 is matched into the screw groove 7.1 on the bearing seat 4.1, the spring 7 is resisted and the bearing seat 4.1 is pressed to the first limiting part 4.25 of the adapter 4.2, the metal insert 4.31 in the ball socket seat 4.3 of the upper ball socket assembly 4 is engaged with the screw 4.22 on the adapter 4.2, the retaining ring is clamped between the ball socket seat 4.3 and the bearing seat 4.1, and the second limiting part 4.26 on the adapter 4.2 is matched, the screw rod assembly provided with the upper ball socket assembly is placed into the guide pipe from top to bottom, at this time, the upper ball socket assembly 4 is prevented from being separated from the movable pipe 3.2, the spring 7 is limited between the upper ball socket assembly 4 and the bearing seat 1 in a posture close to the initial posture, the screw rod is extended from the bearing seat, and then step S3.4 is entered;

[0128] S3.4, the screw rod assembly is limited, the first bearing 5.9 is arranged on the bearing seat 1 corresponding to the initial end position of the screw nut 3.3 of the screw rod 3.1, so as to limit the screw rod assembly 3 from being separated from the upper ball socket assembly 4 in the transverse direction, at this time, the input section 3.11 of the screw rod 3.1 is extended from the bearing seat 1;

[0129] S4, the front shell 6.1 is assembled, the second bearing 1.2 is embedded on the end face of the front shell 6.1, the front shell 6.1 is positioned by the input section 3.11 of the screw rod 3.1 and the bearing seat 1, and the limiting part 8 is clamped on the input section 3.11 of the screw rod 3.1, so as to limit the front shell 6.1 and the screw rod from being separated;

[0130] S5, the power input assembly 5 is assembled, the motor 5.1, the transmission seat 5.6, the first adapter 5.4, the second adapter 5.5 and the worm 5.2 on the output end of the motor 5.1 are sequentially connected and then placed into the inner cavity of the front shell 6.1, and the end cover is arranged on the tail of the front shell 6.1;

[0131] S6, the worm gear 5.3 is assembled, the screw rod 3.1 is rotated, the input section 3.11 of the screw rod 3.1 is forced to be further extended from the bearing seat 1, the worm gear 5.3 is press-fitted to the interference position 3.13 of the input section 3.11, at this time, the worm gear 5.3 is engaged with the transmission position 3.12 on the input section 3.11 of the screw rod 3.1, the screw rod 3.1 is reversely rotated, the worm gear 5.3 is adjusted to cooperate with the worm 5.2, and the end of the guide pipe 2 is adjacent to the first limiting part 4.25 of the adapter 4.2;

[0132] S7, the rear shell 6.2 is assembled, the damper 12 is tightly fitted in the locked part 6.22, the locked part 6.22 is press-fitted to the front shell 6.1, the teeth of the locked part 6.22 and the front shell 6.1 are engaged with the positioning ring 6.3, the input section 3.11 of the screw rod 3.1 is engaged in the damper 12, the locked part 6.21 is press-fitted to the front shell 6.1 and the locked part 6.22, the bolt 10 is passed through the front shell 6.1, the rear shell 6.2 and the bearing seat 1, and is locked by the nut.

[0133] Between steps S3-S6, the ball socket 4.3 is further locked on the receiving part 4.2 until the first limiting part 4.25 abuts against the bearing 4.1 and the second limiting part 4.26 abuts between the bearing 4.1 and the ball socket 4.3, at this time, the spring 7 is limited in a compressed state.

[0134] After the completion of step S3.4, the screw rod assembly 3, the bearing seat 1, the upper ball socket assembly 4 and the spring 7 are limited to each other to form a module in the assembled state, the input section 3.11 of the screw rod 3.1 is extended out of the bearing seat 1, and the screw rod 3.1 can be further extended by rotation due to the spin riveting connection between the movable pipe 3.2 and the upper ball socket assembly 4, so as to facilitate the assembly of the shell 6 and the power input assembly 5.

[0135] In step S3, the assembly force of the spring and the movable pipe acts on the bearing seat with high structural strength, that is, the upper ball socket assembly is assembled towards the bearing seat, which effectively avoids the deformation and damage of the end of the guide pipe caused by the abutting pressure of the receiving part.

[0136] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An L-shaped electric support rod for a rear door of an automobile, characterized by comprising: The utility model relates to a bearing seat (1) is provided with the guide pipe (2) on it, the guide pipe (2) is equipped with the screw rod assembly (3) in, the screw rod assembly (3) one end bears the power input assembly (5), the screw rod assembly (3) other end is connected with the upper ball socket assembly (4), the guide pipe (2) restricts the axial locus of screw rod assembly (3); The screw rod assembly (3) includes a screw rod (3.1) and a movable tube (3.2), the movable tube (3.2) is integrally arranged with the nut (3.3) of the screw rod (3.1) to drive the movable tube (3.2) and the upper ball socket assembly (4) to stretch out and shrink back; The housing (6) is fixedly connected with the bearing seat (1) and contains the power input assembly (5), the axis of the power input assembly (5) is perpendicular to the axis of the screw rod (3.1), the input section (3.11) of the screw rod (3.1) is arranged in the housing (6) and is in transmission connection with the power input assembly (5), The bearing seat (1) and the upper ball socket assembly (4) are provided with a spiral groove (7.1) matched with the spring (7), The power input assembly (5) includes a motor (5.1), a flexible transmission worm (5.2) on the output end of the motor (5.1) and a worm wheel (5.3) engaged on the input section (3.11) of the screw rod (3.1), the input section (3.11) is provided with a transmission part (3.12) and an interference part (3.13), the worm wheel (5.3) is in transmission connection with the screw rod (3.1) through the transmission part (3.12), the worm wheel (5.3) is provided with an interference butt joint part (5.313) engaged with the interference part (3.13), the interference butt joint part (5.313) and the interference part (3.13) are close to the output section (3.15) of the screw rod (3.1), and the transmission part (3.12) corresponds to the engagement position of the worm (5.2) and the worm wheel (5.3). The worm wheel (5.3) includes a sleeve and a connecting piece (5.31) on the input section (3.11) of the screw rod (3.1), and a transmission wheel (5.32) integrally formed on the connecting piece (5.31), the connecting piece (5.31) is provided with an annular body (5.311) corresponding to the transmission part (3.12), the interference butt joint part (5.313) is formed on the connecting piece (5.31), and a plurality of through holes (5.312) are arranged on the annular body (5.311) in the circumferential direction, and the transmission wheel (5.32) is in close connection with the annular body (5.311) through the through holes (5.312).

2. The L-shaped electric supporting rod for a rear door of an automobile according to claim 1, characterized in that: The interference part (3.13) includes an interference amount (3.132) and a guide amount (3.131), the ratio of the interference amount (3.132) to the guide amount (3.131) is 2-2.5, and the ratio of the length of the interference part (3.13) to the interference outer diameter is 2:1.

5.

3. The L-shaped electric supporting rod for a rear door of an automobile according to claim 1, characterized in that: ​ 4. The L-shaped electric supporting rod for a rear door of an automobile according to claim 1, characterized in that: The motor (5.1) output end is provided with a first adapter (5.4), the worm (5.2) is provided with a second adapter (5.5), the worm (5.2) end is inserted with the middle part of the second adapter (5.5) and is driven, the first adapter (5.4) is inserted with the second adapter (5.5) and is driven.

5. A L-shaped electric supporting rod for a rear door of a vehicle according to claim 4, characterized in that: The motor (5.1) output end face is provided with a transmission seat (5.6) between the shell (6), the transmission seat (5.6) is abutted with the first soft pad (5.7) between the shell (6), the tail end of the motor (5.1) is embedded with the second soft pad (5.8) abutting with the shell (6), the first soft pad (5.7) has the extension (5.71) in the axial and radial directions, the transmission seat (5.6) supports the first bearing (5.9) on the worm (5.2), the first adapter (5.4) and the second adapter (5.5) are contained in the transmission seat (5.6), the first soft pad (5.7) and the second soft pad (5.8) cancel the movement gap between the motor (5.1) and the shell (6).

6. A L-shaped electric strut rod for a rear door of a vehicle according to claim 1, characterized in that: The spring (7) is a tower type spring (7), and the spiral groove (7.1) has an open end (7.2) for placing the tower type spring (7), and the open end (7.2) is provided with a slope (7.3) matched with the tower type spring (7).

7. The L-shaped electric supporting rod for a rear door of an automobile according to claim 1, characterized in that: The first limiting structure is arranged between the end of the movable pipe (3.2) and the upper ball socket assembly (4), and the first limiting structure allows the movable pipe (3.2) and the upper ball socket assembly (4) to rotate relative to each other. The second limiting structure is arranged between the bearing seat (1) and the guide pipe (2), and the second limiting structure limits the movable pipe (3.2) from being pulled out away from the upper ball socket assembly (4), and prevents the guide pipe (2) from moving axially and rotating. The electric support rod has an assembled state through the first limiting structure and the second limiting structure, in the assembled state, the bearing seat (1), the screw rod assembly (3) and the upper ball socket assembly (4) are prevented from being pulled out, and the input section (3.11) of the screw rod (3.1) is extended out of the bearing seat (1), and the screw rod (3.1) is allowed to continue to extend out of the bearing seat (1) by rotating.

8. The L-shaped electric support rod for the back door of the automobile according to claim 7, characterized in that: The upper ball socket assembly (4) comprises a bearing seat (4.1), a receiving member (4.2) arranged axially in the bearing seat (4.1), and a ball socket seat (4.3) fixed to one end of the receiving member (4.2), one end of the receiving member (4.2) is engaged with the movable pipe (3.2) through the first limiting structure, the other end of the receiving member (4.2) is extended out of the bearing seat (4.1) and fixedly connected with the ball socket seat (4.3). The first limiting structure includes a spin riveting groove (4.24) arranged at one end of the receiving member (4.2), and a first limiting part (4.25) and a second limiting part (4.26) formed at both sides of the end of the receiving member (4.2), the receiving member (4.2) and the bearing seat (4.1) are limited to be separated in the first direction by the first limiting part (4.25), and the bearing seat and the ball socket (4.3) are limited to be separated in the second direction by the second limiting part (4.26).

9. A L-shaped electric strut rod for a rear door of a vehicle according to claim 7, characterized in that: The second limiting structure includes a limiting convex part (1.1) arranged on the inner wall of the bearing seat (1), a limiting hole (2.1) arranged on the guide pipe (2), and a second bearing (1.2) arranged in the bearing seat (1), the second bearing (1.2) limits the position of the limiting nut (3.3), the limiting convex parts (1.1) are arranged along the axial direction and are spaced apart, and the limiting convex parts (1.1) are arranged corresponding to the limiting hole (2.1).

10. A method of assembling an L-shaped electric support rod for a rear door of an automobile, characterized by, The method comprises the following steps: S1, pre-assemble the screw rod assembly (3), integrally form the screw rod (3.1) and the nut (3.3) on the movable pipe (3.2), and form the built-in nut (3.3) main body part and the external nut (3.3) guide part at the end of the movable pipe (3.2), screw the screw rod (3.1) into the nut (3.3) and into the movable pipe (3.2); S2, assemble the bearing seat (1), integrally form the guide pipe (2) on the limiting convex part (1.1) of the bearing seat (1), and enter step S3.1 or step S3.2; S3.1, assemble the upper ball socket assembly (4) and the spring (7), push the screw rod (3.1) and drive the other end of the movable pipe (3.2) to extend out of the guide pipe (2), spin rivet the receiving member (4.2) of the upper ball socket assembly (4) at the other end of the movable pipe (3.2), arrange one end of the spring (7) into the spiral groove (7.1) on the bearing seat (1), and arrange the other end of the spring (7) into the spiral groove (7.1) on the bearing seat (4.1), resist the spring (7) and press the bearing seat (4.1) to the first limiting part (4.25) of the receiving member (4.2), engage the metal insert (4.31) in the ball socket (4.3) of the upper ball socket assembly (4) with the screw rod (4.22) on the receiving seat, and arrange the retaining ring between the ball socket (4.3) and the bearing seat (4.1) as the second limiting part (4.26) on the receiving member (4.2), at this time the upper ball socket assembly (4) is prevented from being separated from the movable pipe (3.2), the spring (7) is limited between the upper ball socket assembly (4) and the bearing seat (1) in a posture close to the initial position, the screw rod is extended out of the bearing seat, and enters step S3.4; S3.2, the upper ball socket assembly (4) is assembled with the spring (7), the adapter (4.2) of the upper ball socket assembly (4) is riveted on the other end of the movable pipe (3.2), one end of the spring (7) is matched into the screw groove (7.1) on the bearing seat (1), and the other end of the spring (7) is matched into the screw groove (7.1) on the bearing seat (4.1), the spring (7) is resisted and the bearing seat (4.1) is pressed to the first limiting portion (4.25) of the adapter (4.2), the metal insert (4.31) in the ball socket seat (4.3) of the upper ball socket assembly (4) is engaged with the screw (4.22) on the adapter seat, and the retaining ring is clamped between the ball socket seat (4.3) and the bearing seat (4.1), as the second limiting portion (4.26) on the adapter (4.2), the lead screw assembly provided with the upper ball socket assembly is placed into the guide pipe from top to bottom, at this time, the upper ball socket assembly (4) is prevented from being separated from the movable pipe (3.2), the spring (7) is limited between the upper ball socket assembly (4) and the bearing seat (1) in a posture close to the initial state, the lead screw is extended out of the bearing seat, and step S3.4 is entered; S3.4, the lead screw assembly is limited, the first bearing (5.9) is arranged at the initial end position of the nut (3.3) corresponding to the lead screw (3.1) of the bearing seat (1), so as to limit the lead screw assembly (3) from being translated and separated away from the upper ball socket assembly (4), at this time, the input section (3.11) of the lead screw (3.1) is extended out of the bearing seat (1); S4, the front shell (6.1) is assembled, the second bearing (1.2) is embedded on the end face of the front shell (6.1), the front shell (6.1) is positioned by the input section (3.11) of the lead screw (3.1) and the bearing seat (1) and is prevented from rotating, the limiting piece (8) is clamped on the input section (3.11) of the lead screw (3.1), so as to limit the front shell (6.1) and the lead screw from being separated; S5, the power input assembly (5) is assembled, the motor (5.1), the transmission seat (5.6), the first adapter (5.4), the second adapter (5.5) and the worm (5.2) on the output end of the motor (5.1) are sequentially connected and then placed into the inner cavity of the front shell (6.1), and the end cover is covered on the tail of the front shell (6.1); S6, the worm gear (5.3) is assembled, the lead screw (3.1) is rotated, the input section (3.11) of the lead screw (3.1) is forced to be further extended out of the bearing seat (1), the worm gear (5.3) is press-fitted to the interference position (3.13) of the input section (3.11) and is tightly matched, at this time, the worm gear (5.3) is engaged with the transmission position (3.12) on the input section (3.11) of the lead screw (3.1), the lead screw (3.1) is reversely rotated, the cooperation between the worm gear (5.3) and the worm (5.2) is adjusted, and the end of the guide pipe (2) is adjacent to the first limiting portion (4.25) of the adapter (4.2); S7, the rear shell (6.2) is assembled, the tight fit damper (12) is locked in the locked part (6.22), the locked part (6.22) is pressed to the front shell (6.1), the teeth on the locked part (6.22) and the front shell (6.1) are engaged with the positioning ring (6.3), the input section (3.11) of the screw rod (3.1) is engaged into the damper (12), the locking part (6.21) is pressed to the front shell (6.1) and the locked part (6.22), the locking part (6.21) is locked with the locking inclined surface (7.3) (6.4) of the locked part (6.22), the bolt (10) is inserted into the front shell (6.1), the rear shell (6.2) and the bearing seat (1), and locked by the nut.

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