CN220747984U - Electric opening and closing mechanism assembly for trunk door of car - Google Patents

Abstract

The utility model provides an electronic closing mechanism assembly of car luggage door, which comprises a motor, the screw rod, reducing gear, the reducing gear casing comprises left casing and right casing fixed connection, integrated into one piece has motor installation department on the left casing, motor installation department's axial is perpendicular with left casing axial, a motor sets up in motor installation department intracavity, left casing and right casing fold in opposite directions fixedly form reducing gear installation chamber, reducing gear is worm gear mechanism, worm and motor's axle fixed connection, worm and worm wheel meshing, worm wheel fixed connection is at the screw rod tail end, the reducing gear casing is extended to the screw rod other end, a telescopic link blank is on the screw rod, and through telescopic link hole fixed connection's nut and screw rod cooperation, a guide bar blank overlaps on the telescopic link, form sliding fit through the direction protruding muscle of guide spout and telescopic link, the first fixedly connected with guide ring of guide bar, guide ring and telescopic link sliding fit.

Description

Electric opening and closing mechanism assembly for trunk door of car

Technical Field

The utility model relates to the technical field of automobile parts, in particular to an electric opening and closing mechanism assembly for a trunk door of a car.

Background

The electric luggage compartment opening and closing mechanism of the automobile is divided into two parts, namely a motor and a transmission guide mechanism, the motor provides power for the guide mechanism, the guide mechanism is driven to stretch out and draw back through a planetary transmission structure, the automobile luggage compartment door is driven to open and close, most of the guide mechanisms of the luggage compartment opening and closing mechanism at present are matched with a screw rod and a telescopic rod, and an extension spring is arranged on the outer wall of the telescopic rod, so that the radial load capacity and the stabilizing force of the guide mechanism are insufficient, teeth are easy to damage when a user opens and closes the automobile door rapidly, radial and axial shaking are generated, abnormal noise is caused, and the use experience of the user is reduced.

In the connection mode of the motor and the transmission guide mechanism, most of electric trunk opening and closing mechanisms of automobiles are arranged in parallel shafts, namely, the motor is axially parallel to the supporting rod, but the arrangement mode has the defects that when the power of the motor is transmitted to the supporting rod part, the motor needs to be provided with two or more stages of planetary transmission structures for decelerating the power of the motor, and the motor can realize the deceleration function, but the multistage planetary transmission structures have a large number of parts and components, the structure is complex, the mechanism volume is increased, the probability of failure is high, the product assembly and maintenance difficulties are high, and the improvement of the mechanism quality is not facilitated; in addition, a part of motors of the opening and closing mechanism of the electric luggage compartment and the stay bars are coaxially arranged, but the arrangement makes the axial length of the whole mechanism overlong, and the mechanism is only suitable for large-sized cars and is not suitable for small-sized cars, so that the mechanism is not beneficial to popularization.

Disclosure of Invention

The utility model aims at solving the problems in the prior art and provides an electric opening and closing mechanism assembly of a car trunk door, which is characterized in that a guide rod is sleeved on the outer wall of a telescopic rod, and a guide chute on the inner wall of the guide rod is in circumferential limit sliding fit with a guide convex rib on the outer wall of the telescopic rod, so that a guide part of the electric opening and closing mechanism of the car trunk door comprises a screw rod, a telescopic rod and the guide rod, the guide rod shares radial loads of the screw rod and the telescopic rod, and the radial bending strength of the guide part of the electric opening and closing mechanism of the car trunk door is increased; and the tail end of the guide rod and the inner wall of the shell of the speed reducing mechanism are fixedly positioned by a shaft, and meanwhile, the inner wall of the shell of the speed reducing mechanism forms circumferential limit for the guide rod, so that the circumferential and radial movement of the guide rod is better prevented, and the stability and the compression resistance of the guide part are improved. Meanwhile, the motor installation part is axially and vertically arranged with the shell of the speed reducing mechanism, the speed reducing mechanism is a worm gear mechanism, motor power can be transmitted to the guide part only by one-stage speed reduction, vertical movement is changed into horizontal movement, the transmission structure is simplified, the number of parts is reduced, the volume of the electric opening and closing mechanism assembly of the trunk door of the car is reduced, and the electric opening and closing mechanism assembly is simultaneously suitable for large, medium and small cars and is convenient for installation and mechanism popularization.

The purpose of the utility model is realized in the following way:

the utility model provides an electronic closing mechanism assembly of car luggage compartment door, includes motor, screw rod, reduction gears casing, the reduction gears casing comprises left casing and right casing fixed connection, integrated into one piece has motor installation department on the left casing, the axial of motor installation department is perpendicular with left casing axial, and a motor setting is in motor installation department intracavity, left side casing and right casing fold in opposite directions fixedly and form reduction gears installation cavity, reduction gears is worm gear, worm and motor's axle fixed connection, worm and worm wheel meshing, worm wheel fixed connection is at the screw rod tail end, and the screw rod other end extends the reduction gears casing, and a telescopic link blank is on the screw rod, and forms circumference location sliding fit through the guide chute of guide bar inner wall and telescopic link, the tail end of guide bar is through the axial spacing groove axial spacing fixed connection of setting with reduction gears casing inner wall, be provided with axial protruding portion on the axial location flange, the axial spacing groove for supplying in the axial spacing groove to insert the axial spacing groove, the guide bar end and the fixed connection of guide bar, the end of telescopic link, the fixed connection end and the fixed connection of guide bar, the end of guide bar and telescopic link, free end and the fixed connection.

The head end of the telescopic rod is connected with the inner wall of the free end connector in a threaded manner.

The inner walls of the left shell and the right shell are respectively provided with a worm wheel mounting groove used for mounting a worm wheel, a mounting cavity used for mounting a worm is arranged in the worm wheel mounting groove of the right shell, the mounting cavity is communicated with an inner cavity of the motor mounting part, and one side of the worm is exposed out of the mounting cavity and meshed with the worm wheel.

The outer wall of the guide rod is sleeved with an extension spring, the head end of the extension spring is screwed into the spiral groove of the free end connector and is fixedly connected with the free end connector, and the tail end of the extension spring is screwed into the spiral groove of the head end of the speed reducing mechanism shell and locks and fixes the left shell and the right shell.

The tail end fixedly connected with stiff end of reducing mechanism casing, the inner wall of left casing, right casing sets up the mounting groove that is used for the axial spacing to stiff end joint respectively, the spacing flange and the mounting groove cooperation of stiff end joint form the axle location fixed to stiff end joint.

The extension end of motor installation department sets up the end cover, in the end cover inserts motor installation department, through the elasticity limit clip b that sets up on the end cover wall with the draw-in groove joint cooperation on the motor installation department wall.

The worm wheel is radially and fixedly connected with a spline shaft arranged on the screw rod through a spline hole arranged in the center, and a clamping ring is arranged on one side of the spline shaft and used for limiting the worm wheel axially.

The left shell and the right shell are fixedly connected through screws after being folded in opposite directions, and reinforcing ribs parallel to the shells are respectively arranged on the outer walls of the parts of the worm wheels arranged on the left shell and the right shell.

The speed reducing mechanism shell and the guide rod are made of resin materials.

The guide ring is made of polyformaldehyde or polyether-ether-ketone.

One end of the worm, which is connected with the motor, is supported in the motor installation part through a third bearing, the other end of the worm is supported in a bearing hole formed in the left shell through a second bearing, two bearings are installed on the screw, the two bearings are respectively positioned on two sides of the worm wheel, the first bearing is supported in a hole of the fixed end joint, and the fourth bearing is supported in bearing installation grooves formed in the left shell and the right shell.

The guide ring is inserted into the guide rod and is clamped and fixed with a guide ring positioning hole arranged on the wall of the guide rod through an elastic limiting clip a arranged on the guide ring.

The contact surfaces of the left shell and the right shell which are folded in opposite directions are parallel to the axis of the screw rod.

The number of the axial protruding parts on the shaft positioning flange is two, and the number of the anti-rotation limiting grooves is two.

The axial protruding parts are boss structures or tooth structures which are symmetrically arranged.

By adopting the scheme, the electric opening and closing mechanism assembly for the car trunk door comprises a motor, a screw rod, a speed reducing mechanism and a speed reducing mechanism shell, wherein the speed reducing mechanism shell is formed by fixedly connecting a left shell and a right shell, the left shell is provided with a motor installation part in an integrated manner, the axial direction of the motor installation part is perpendicular to the axial direction of the left shell, a motor is arranged in a cavity of the motor installation part, the left shell and the right shell are oppositely folded and fixed to form a speed reducing mechanism installation cavity, the speed reducing mechanism is a worm and gear mechanism, the worm is fixedly connected with a shaft of the motor, the worm is meshed with a worm wheel, the worm wheel is fixedly connected with the tail end of the screw rod, the other end of the screw rod extends out of the speed reducing mechanism shell, a telescopic rod is sleeved on the screw rod in an empty mode, a guide rod is sleeved on the telescopic rod, a guide chute arranged through the inner wall of the guide rod forms circumferential positioning sliding fit with the guide convex ribs arranged on the telescopic rod, the telescopic rod is prevented from generating circumferential rotation during working, and meanwhile, the guide rod can share the radial load of the telescopic rod, and stability is improved. The tail end of the guide rod is axially and fixedly connected with an axial limiting groove of the inner wall of the shell of the speed reducing mechanism through a shaft positioning flange, an axial protruding part is arranged on the shaft positioning flange, an anti-rotation limiting groove for the insertion of the axial protruding part is arranged in the axial limiting groove, and the axial protruding part and the anti-rotation limiting groove are matched to form circumferential limiting for preventing the guide rod from rotating and improving stability. The guiding ring is fixedly connected to the first end of the guiding rod and is in sliding fit with the telescopic rod, and the guiding ring enables the guiding rod to be more stable in fit with the telescopic rod and eliminates radial runout. The head end and the free end of telescopic link are fixed connection, the outer wall of free end joint, reduction gears casing outer wall are provided with spiral slot respectively for with extension spring fixed connection, a stiff end joint is connected to axial spacing on the reduction gears casing, the stiff end joint is used for connecting automobile body, or car luggage compartment door.

The electric opening and closing mechanism assembly of the trunk door of the car has the advantages of simple structure, convenient and quick assembly, strong radial and axial compressive resistance, high stability and small occupied volume, is suitable for large, medium and small cars, and is convenient to popularize.

The utility model is further described below with reference to the drawings and detailed description.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view in the A-A direction of fig. 1.

Fig. 3 is a schematic view of the B-B direction of fig. 1.

Fig. 4 is an exploded view of the present utility model.

Fig. 5 is a schematic perspective view of the right housing of the present utility model.

Fig. 6 is a schematic perspective view of the left housing and the motor mounting portion of the present utility model.

Fig. 7 is a schematic structural view of the guide mechanism of the present utility model.

Fig. 8 is a perspective view of a guide bar of the present utility model.

Fig. 9 is a perspective view of a guide bar of the present utility model.

Reference numerals illustrate: the motor comprises a motor 1, a motor mounting part 1-2, an end cover 1-3, a first bearing 1-4, a worm 1-5, a fourth bearing 1-6, a clamping groove 1-9, a left shell 2-1, a right shell 2-2, a screw 3, a telescopic rod 4, a guide rod 5, a second bearing 6, a worm wheel 7, a clamping ring 8, a third bearing 9, a fixed end joint 10, a free end joint 11, an extension spring 12, a guide ring positioning hole 13, a pin 14, a pin hole 15, a reinforcing rib 16, a flexible limiting clip a17, an external thread 18, a guide rib 19, a spiral groove 20, an anti-rotation limiting groove 21, an axial limiting groove 22, a worm wheel mounting groove 23, a mounting groove 24, a mounting cavity 25, a threaded blind hole 26, a threaded through hole 27, a flexible limiting clip b28, a guide ring 29, a nut 30, a guide chute 31, a limiting flange 32, a shaft positioning flange 33, an axial protruding part 34, a bearing mounting groove 35 and a spline shaft 36.

Detailed Description

Referring to fig. 1 to 9, an electric opening and closing mechanism assembly for a trunk door of a car comprises a motor 1, a screw 3, a speed reducing mechanism and a speed reducing mechanism shell, wherein the speed reducing mechanism shell is formed by fixedly connecting a left shell 2-1 and a right shell 2-2, a motor mounting part 1-2 is integrally formed on the left shell 2-1, the axial direction of the motor mounting part 1-2 is vertical to the axial direction of the left shell 2-1, a motor 1 is arranged in a cavity of the motor mounting part 1-2, the left shell 2-1 and the right shell 2-2 are oppositely folded and fixed to form a speed reducing mechanism mounting cavity, the speed reducing mechanism is a worm gear mechanism, the worm 1-5 is fixedly connected with a shaft of the motor 1, the worm 1-5 is meshed with the worm wheel 7, the worm wheel 7 is fixedly connected to the tail end of the screw rod 3, in the embodiment, the worm wheel 7 is radially and fixedly connected with a spline shaft 36 arranged on the screw rod 3 through a spline hole arranged in the center, a clamping ring 8 is arranged on one side of the spline shaft 36 and used for limiting the worm wheel 7 axially, the motor 1 is used for driving the screw rod 3 to rotate, the worm wheel and worm is simple in structure, power can be transmitted to the screw rod 3 only through a first-stage speed reducing mechanism, the motor 1 and the screw rod 3 are vertically staggered, the size of an electric opening and closing mechanism of a trunk door of a sedan is reduced, the electric opening and closing mechanism is suitable for large sedan and middle-sized sedan, and is convenient for popularization of the mechanism; the folding contact surface of the speed reducing mechanism shell is parallel to the guide mechanism where the screw 3 is positioned, and the axial bearing capacity of the mechanism is improved; the screw rod 3 is embedded in the center of the worm wheel 7, so that inclined load caused by inclined end surface in the operation of the worm wheel 7 is avoided, and tooth breakage caused when the door is opened and closed manually and rapidly is avoided, and abnormal noise and failure of the door opening and closing function are avoided.

In this embodiment, the inner walls of the left and right housings 2-1 and 2-2 are respectively provided with a worm wheel mounting groove 23 for mounting the worm wheel 7, the two worm wheel mounting grooves 23 are symmetrical, the two worm wheel mounting grooves 23 are folded in opposite directions to form a mounting cavity of the worm wheel 7 for limiting and fixing the worm wheel 7 axially, and the two worm wheel mounting grooves 23 are integrally formed in the inner walls of the two housings, so that the number of parts is reduced, and the economy and the assembly efficiency are improved. The worm wheel mounting groove 23 of the right shell 2-2 is internally provided with a mounting cavity 25 for mounting the worm 1-5, the mounting cavity 25 is communicated with the inner cavity of the motor mounting part 1-2, one side of the worm 1-5 is exposed out of the mounting cavity 25 and meshed with the worm wheel 7, in the embodiment, one end, connected with the motor, of the worm 1-5 is supported in the motor mounting part 1-2 through a third bearing 9, the other end of the worm 1-5 is supported in a bearing hole formed in the left shell 2-1 through a second bearing 6, the worm 1-5 is supported through two bearings, radial runout of the worm 1-5 is prevented, and running stability is improved.

The other end of the screw rod 3 extends out of a speed reducing mechanism shell, a telescopic rod 4 is sleeved on the screw rod 3 in an empty mode, a nut 30 fixedly connected with an inner hole of the telescopic rod 4 is matched with an external thread 18 of the screw rod 3, a guide rod 5 is sleeved on the telescopic rod 4 in an empty mode, a guide chute 31 on the inner wall of the guide rod 5 and a guide convex rib 19 arranged on the telescopic rod 4 form circumferential positioning sliding fit, circumferential rotation of the telescopic rod 4 during working is prevented, lateral displacement of the telescopic rod 4 after the guide mechanism is resisted to be pressed is improved, and stability and compression resistance of the guide mechanism are improved; the tail end of the guide rod 5 is in axial limiting fixed connection with an axial limiting groove 22 on the inner wall of a shell of the speed reducing mechanism through a shaft positioning flange 33, two axial convex axial protruding portions 34 are arranged on the shaft positioning flange 33, an anti-rotation limiting groove 21 for inserting the axial protruding portions 34 is arranged in the axial limiting groove 22, the axial protruding portions 34 and the anti-rotation limiting groove 21 are matched to form circumferential limiting for preventing the guide rod 5 from rotating, circumferential limiting of the guide rod 5 is achieved, circumferential rotation and radial movement of the guide rod 1 are prevented, and stability of the guide mechanism is improved. In this embodiment, the number of the axial protrusions 34 on the shaft positioning flange 33 is two, the number of the anti-rotation limiting grooves 21 is two, and the axial protrusions 34 are symmetrically arranged boss structures or tooth structures. The guiding ring 29 is fixedly connected to the first end of the guiding rod 5, the guiding ring 29 is in sliding fit with the telescopic rod 4, so that the sliding fit parts of the guiding rod 1 and the telescopic rod 2 are more stable, radial runout of the first end of the guiding rod 1 is eliminated, the stability of the guiding mechanism is improved, in the embodiment, the guiding ring 29 is inserted into the guiding rod 5, and the guiding ring positioning hole 13 arranged on the wall of the guiding rod 5 is fixedly clamped with the elastic limiting clip a17 arranged on the guiding ring 29. The head end of the telescopic rod 4 is fixedly connected with the free end joint 11, and in this embodiment, the head end of the telescopic rod 4 is in threaded connection with the inner wall of the free end joint 11. The outer wall of the free end joint 11 and the outer wall of the reducing mechanism shell are respectively provided with a spiral groove 20, the two spiral grooves 20 of the outer wall of the reducing mechanism shell are folded in opposite directions to form a complete spiral groove 20 which is used for being fixedly connected with the extension spring 12, in the embodiment, the outer wall of the guide rod 5 is sleeved with the extension spring 12, the spiral groove 20 of the head end of the extension spring 12 screwed into the free end joint 11 is fixedly connected with the free end joint 11, the tail end of the extension spring 12 is screwed into the spiral groove 20 of the head end of the reducing mechanism shell, the left shell 2-1 and the right shell 2-2 are locked and fixed, the connecting structure between the motor installation part 1-2 and the extension spring 12 is reduced, the number of parts is reduced, the economy and the assembly efficiency are improved, when the car trunk door is opened, the inner ring of the extension spring 12 locks the left shell 2-1 and the right shell 2-2, the fixing reliability is improved, the extension spring 12 provides tension for the trunk door, and the extension spring 12 serves as a buffer when the trunk door is closed. When the car trunk door is opened to any position, the pulling moment of the extension spring 12 and the movement resistance moment of each transmission piece in the mechanism can balance the weight moment of the trunk door, so that the trunk door can hover at any position, and convenience is provided for users.

In the embodiment, the tail end of the speed reducing mechanism shell is fixedly connected with a fixed end joint 10, the inner walls of the left shell 2-1 and the right shell 2-2 are respectively provided with a mounting groove 24 for axially limiting the fixed end joint 10, a limiting flange 32 of the fixed end joint 10 is matched with the mounting groove 24 to form shaft positioning fixation for the fixed end joint 10, two bearings are arranged on the screw 3 and are respectively positioned at two sides of the worm wheel 7, the first bearing 1-4 is supported in a hole of the fixed end joint 10, the fourth bearing 1-6 is supported in bearing mounting grooves 35 arranged on the left shell and the right shell to prevent radial runout of the screw, the running stability is improved, and the fixed end joint 10 is used for connecting a car body or a trunk door.

In this embodiment, the extending end of the motor mounting portion 1-2 is provided with an end cover 1-3, the end cover 1-3 is inserted into the motor mounting portion 1-2, and the elastic limit clip b28 provided on the wall of the end cover 1-3 is engaged with the clamping groove 1-9 provided on the wall of the motor mounting portion 1-2, so that after the motor 1 is mounted, the elastic limit clip b28 of the end cover 1-3 is clamped into the clamping groove 1-9 to compress the end surface of the motor 1, thereby fixing the motor 1 and preventing the motor 1 from moving.

In this embodiment, on the joint surface of the left casing 2-1 and the right casing 2-2, one casing is provided with a plurality of pins 14, the other casing is provided with a plurality of pin holes 15, the positions of the pins 14 and the pin holes 15 are symmetrical, the left casing 2-1 and the right casing 2-2 are fixedly connected through screws after being folded in opposite directions, a threaded blind hole 26 is formed in the left casing 2-1, a threaded through hole 27 is formed in the right casing 2-2, and the screws penetrate through the threaded through hole 27 and are connected with the threaded blind hole 26, so that the two casings are folded in opposite directions and fixed. The outer walls of the parts of the left shell 2-1 and the right shell 2-2, on which the worm wheel 7 is arranged, are respectively provided with reinforcing ribs 16 parallel to the shells, so that the axial load capacity of the mechanism is improved. The contact surfaces of the left shell 2-1 and the right shell 2-2 which are folded in opposite directions are parallel to the axis of the screw 3.

In this embodiment, the guide ring 29 is made of polyoxymethylene or polyetheretherketone, and the friction coefficient of the material is low, so that the telescopic rod 4 can move more smoothly.

In this embodiment, the speed reducing mechanism housing and the guide rod 5 are integrally formed by resin materials, so that the production efficiency is high, the product is light, the installation of parts such as the speed reducing mechanism is facilitated, the assembly man-hour is reduced, only one process is needed for installation and fixation, and the assembly efficiency is improved.

Claims (15)

1. The utility model provides an electronic closing mechanism assembly of car luggage compartment door, includes motor (1), screw rod (3), reduction gears casing, its characterized in that: the speed reducing mechanism shell is formed by fixedly connecting a left shell (2-1) and a right shell (2-2), a motor installation part (1-2) is integrally formed on the left shell (2-1), the axial direction of the motor installation part (1-2) is vertical to the axial direction of the left shell (2-1), a motor (1) is arranged in a cavity of the motor installation part (1-2), the left shell (2-1) and the right shell (2-2) are oppositely folded and fixed to form a speed reducing mechanism installation cavity, the speed reducing mechanism is a worm gear mechanism, the worm (1-5) is fixedly connected with a shaft of the motor (1), the worm (1-5) is meshed with a worm wheel (7), the worm wheel (7) is fixedly connected to the tail end of a screw (3), the other end of the screw (3) extends out of the speed reducing mechanism shell, a telescopic rod (4) is sleeved on the screw (3) in an empty mode, a nut (30) fixedly connected with the inner hole of the telescopic rod (4) is matched with the screw (3), a guide rod (5) is sleeved on the telescopic rod (4) in an empty mode, the guide rod (4) is matched with a guide bar (19) in a circumferential direction through a guide bar (31) of the guide rod (5), the tail end of the guide rod (5) is axially limited and fixedly connected with an axial limiting groove (22) on the inner wall of a shell of the speed reducing mechanism through an axial positioning flange (33), an axial protruding portion (34) is arranged on the axial positioning flange (33), an anti-rotation limiting groove (21) for inserting the axial protruding portion (34) is arranged in the axial limiting groove (22), the axial protruding portion (34) and the anti-rotation limiting groove (21) are matched to form circumferential limiting for preventing the guide rod (5) from rotating, the first end of the guide rod (5) is fixedly connected with a guide ring (29), the guide ring (29) is in sliding fit with a telescopic rod (4), the first end of the telescopic rod (4) is fixedly connected with a free end connector (11), spiral grooves (20) are respectively formed in the outer wall of the free end connector (11) and the outer wall of the shell of the speed reducing mechanism, and the fixed end connector (10) are fixedly connected with a tension spring (12) in a matched mode, and the first end connector (10) is axially limited and fixedly connected on the shell of the speed reducing mechanism.

2. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the head end of the telescopic rod (4) is in threaded connection with the inner wall of the free end joint (11).

3. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the inner walls of the left shell (2-1) and the right shell (2-2) are respectively provided with a worm wheel mounting groove (23) for mounting a worm wheel (7), a mounting cavity (25) for mounting a worm (1-5) is arranged in the worm wheel mounting groove (23) of the right shell (2-2), the mounting cavity (25) is communicated with the inner cavity of the motor mounting part (1-2), and one side of the worm (1-5) is exposed out of the mounting cavity (25) and meshed with the worm wheel (7).

4. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the outer wall of the guide rod (5) is sleeved with an extension spring (12), a spiral groove (20) of the head end of the extension spring (12) is screwed into the free end connector (11) and fixedly connected with the free end connector (11), and the tail end of the extension spring (12) is screwed into the spiral groove (20) of the head end of the speed reduction mechanism shell and locks and fixes the left shell (2-1) and the right shell (2-2).

5. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the tail end fixedly connected with stiff end joint (10) of reducing mechanism casing, the inner wall of left casing (2-1), right casing (2-2) sets up respectively and is used for spacing mounting groove (24) to stiff end joint (10) axial, spacing flange (32) and mounting groove (24) cooperation of stiff end joint (10) form the axle location fixed to stiff end joint (10).

6. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the extension end of the motor installation part (1-2) is provided with an end cover (1-3), the end cover (1-3) is inserted into the motor installation part (1-2), and the end cover is clamped and matched with a clamping groove (1-9) on the wall of the motor installation part (1-2) through an elastic limiting clamp b (28) arranged on the wall of the end cover (1-3).

7. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the worm wheel (7) is fixedly connected with a spline shaft (36) arranged on the screw (3) in the radial direction through a spline hole arranged in the center, and a clamping ring (8) is arranged on one side of the spline shaft (36) and used for limiting the worm wheel (7) in the axial direction.

8. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: on the faying surface of left casing (2-1), right casing (2-2), one of them casing is provided with a plurality of pins (14), and another casing is provided with a plurality of pinholes (15), the position symmetry of pin (14) and pinhole (15), left side casing (2-1), right casing (2-2) are foldingly in opposite directions back through screw fixed connection, install worm wheel (7) position outer wall on left side casing (2-1), right side casing (2-2) and set up respectively with casing parallel strengthening rib (16).

9. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the speed reducing mechanism shell and the guide rod (5) are made of resin materials.

10. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the guide ring (29) is made of polyformaldehyde or polyether-ether-ketone.

11. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: one end of the worm (1-5) connected with the motor is supported in the motor installation part (1-2) through a third bearing (9), the other end of the worm (1-5) is supported in a bearing hole formed in the left shell (2-1) through a second bearing (6), two bearings are mounted on the screw (3) and are respectively positioned on two sides of the worm wheel (7), the first bearing (1-4) is supported in a hole of the fixed end joint (10), and the fourth bearing (1-6) is supported in bearing installation grooves (35) formed in the left shell and the right shell.

12. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the guide ring (29) is inserted into the guide rod (5) and is clamped and fixed with a guide ring positioning hole (13) arranged on the wall of the guide rod (5) through an elastic limiting clip a (17) arranged on the guide ring (29).

13. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the contact surfaces of the left shell (2-1) and the right shell (2-2) which are folded in opposite directions are parallel to the axis of the screw (3).

14. The car trunk door electric opening and closing mechanism assembly according to claim 1, wherein: the number of the axial protruding parts (34) on the shaft positioning flange (33) is two, and the number of the anti-rotation limiting grooves (21) is two.

15. The car trunk door electric opening and closing mechanism assembly according to claim 1 or 14, wherein: the axial protruding parts (34) are symmetrically arranged boss structures or protruding tooth structures.