CN220434533U - Vehicle door driving mechanism - Google Patents

Abstract

The application relates to a door actuating mechanism, including drive unit, lead screw, screw nut, connecting piece, push rod and casing, the casing is installed in the door, drive unit connect in drive unit, drive unit connect in the lead screw, screw nut cover is located on the lead screw, the connecting piece includes fixed connection's first connecting portion and second connecting portion, the second connecting portion movably install in the screw nut, first connecting portion connect in the first end of push rod, the second end of push rod connect in the automobile body, be equipped with the slider on the screw nut, be equipped with the spout in the casing, the screw nut passes through the slider slidingly install in the spout. The push rod and the screw nut are connected by the connecting piece, so that the device is simple in structure, convenient to assemble and high in operation stability.

Description

Vehicle door driving mechanism

Technical Field

The utility model relates to a driving mechanism, in particular to a vehicle door driving mechanism.

Background

With the development of motorization and intellectualization of automobiles, door systems are also gradually developed from manual doors toward automated door systems.

The traditional automatic vehicle door driving mechanism adopts a four-bar structure, so that the structure is complex, the occupied space is large, the requirement on the installation of the vehicle door is high, and the further development of the automatic vehicle door is not facilitated. Therefore, a driving mechanism using the bevel gear and the bevel gear disk as a transmission unit appears, but at present, the driving mechanism has a complex structure, is difficult to assemble and has poor operation reliability in the use process.

Disclosure of Invention

In order to overcome the defects, the application provides a vehicle door driving mechanism, which utilizes a connecting piece to connect a push rod and a screw nut, so that the structure is simple, the assembly is convenient, and the operation stability is high.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a door actuating mechanism, includes drive unit, lead screw, screw nut, connecting piece, push rod and casing, the casing is installed in the door, drive unit connect in drive unit, drive unit connect in the lead screw, screw nut cover is located on the lead screw, the connecting piece includes fixed connection's first connecting portion and second connecting portion, the second connecting portion movably install in the screw nut, first connecting portion connect in the first end of push rod, the second end of push rod connect in the automobile body, be equipped with the slider on the screw nut, be equipped with the spout in the casing, screw nut passes through the slider slidingly install in the spout.

Optionally, a ball socket is arranged on the screw nut, the second connecting portion is installed in the ball socket, the second connecting portion is clamped in the ball socket through a cotter pin, and the first connecting portion and the push rod are riveted together.

Optionally, the both sides of screw-nut are equipped with the slider, be equipped with the accommodation chamber in the slider, the rubber column is installed to the accommodation intracavity, screw-connection portion is fixed to screw-nut's lower extreme, the upper surface and the lower surface of slider are the arc surface.

Optionally, the second connecting portion includes cone and bulb, cone's first end fixed connection in first connecting portion, cone's second end fixed connection in the bulb, cone's first end cross sectional area is greater than cone's second end cross sectional area, cotter pin card in cone with the junction of bulb, the connecting piece radially outwards extends and forms the round retaining ring, the retaining ring is located first connecting portion with the junction of second connecting portion.

Optionally, the first end of push rod is equipped with first connector, the second end of push rod is equipped with the second connector, first connector with all be equipped with the pinhole on the second connector, first connecting portion rivet in the pinhole of first connector, the second connector passes through pin joint in automobile body installing support.

Optionally, a door mounting bracket is further provided, the door mounting bracket is fixedly connected to the housing, a mounting hole is formed in the door mounting bracket, and the second end of the push rod is arranged in the mounting hole in a penetrating mode.

Optionally, the casing is the integrated into one piece that adopts aluminium alloy extrusion, the spout direct shaping in the inboard of casing, the first end of casing is sealed through the sealing head, the second end fixed mounting of casing in the door installing support, screw-nut is integrated into one piece, the slider direct shaping in screw-nut's both sides.

Optionally, the transmission unit includes intermeshing's awl tooth and awl tooth dish, drive unit connect in the awl tooth, the awl tooth dish cup joint in through the inner circle draw-in groove the outer lane draw-in groove of lead screw.

Optionally, the driving unit comprises a motor, an output shaft of the motor is fixedly connected with the bevel gear in the circumferential direction, a bevel gear disc is fixedly connected with the screw rod in the circumferential direction, an output shaft of the motor is vertically arranged with the screw rod, a plug is connected to the motor, and the plug is vertically arranged with the motor.

Optionally, the shell is established to the outside cover of motor, the motor with seal through the sealing member between the shell, the sealing member includes fixed connection's sealing cap and sealing disk, the edge of sealing disk is equipped with the sealing piece, the sealing piece follow the axial of sealing disk outstanding in the sealing disk.

The beneficial effects of this application are:

1) The automobile door driving device comprises a driving unit, a transmission unit, a screw rod nut and a push rod, wherein the driving unit drives the screw rod to rotate through the transmission unit, and the screw rod drives the screw rod nut and the push rod to conduct reciprocating linear motion along the screw rod, so that the push rod drives the automobile door to open and close relative to an automobile body; the transmission unit comprises the bevel gear and the bevel gear disk, so that the transmission unit is simple and compact in structure, small in occupied space and suitable for mounting requirements of doors of various specifications.

2) The screw rod nut is connected with the push rod through the connecting piece, and the connecting piece is movably connected with the push rod and the screw rod nut, so that when the push rod swings relative to the vehicle door, the operation of the screw rod nut cannot be influenced, the operation stability of the screw rod and the screw rod nut is improved, and meanwhile, the manufacturing and assembling difficulty of the screw rod nut and the push rod is reduced.

3) The shell and the screw nut are integrated into one piece, the spout is directly formed at the inside of the shell when the shell is formed, and the slide blocks are directly formed at the two sides of the screw nut when the screw nut is formed, so that other parts are not required to be added to arrange the spout and the slide blocks, and the shell is formed by extrusion of aluminum profiles, so that the manufacturing cost of the driving mechanism is reduced.

4) The inside and outside of lead screw nut all is equipped with the slider in this application, and the upper and lower surface laminating of slider is in the spout of casing, all designs into the arc with the upper surface and the lower surface of slider, reduces the area of contact of slider and casing to the frictional force that the slider operation process produced has been reduced, has reduced the wearing and tearing of slider, sets up the holding chamber in the slider, and installs the rubber post that has elasticity in the holding intracavity, makes slider flexible contact in the casing, has both guaranteed the stability of slider operation, makes the slider have certain deformation space again, satisfies user demand, and has improved the stability of lead screw nut operation.

5) The sealing element is arranged between the motor and the shell, the sealing element is made of flexible materials, the motor can be centered in the assembly process, a part of vibration can be absorbed to play a role in noise reduction during operation, meanwhile, the sealing effect is achieved, the sealing piece can seal the end faces of the motor and the shell, and the sealing effect of the sealing element is further improved.

6) The vehicle door mounting bracket and the shell form a sealing space, the transmission unit, the screw rod and the screw rod nut are all positioned in the sealing space, the push rod penetrates out of the sealing space through the mounting hole and is connected with the vehicle body, the elastic sleeve is arranged between the mounting hole and the push rod, external pollutants can be effectively prevented from entering the sealing space through the mounting hole, and the components in the sealing space are polluted, so that the service lives of the driving unit and the transmission unit are prolonged.

Drawings

FIG. 1 is a schematic diagram of a driving mechanism in the present application;

FIG. 2 is a second schematic structural view of the driving mechanism of the present application;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of FIG. 3 at D;

FIG. 5 is one of the structural schematic illustrations of the lead screw nut and the connector of the present application;

FIG. 6 is a second schematic illustration of the construction of the lead screw nut and the connector of the present application;

FIG. 7 is a schematic three-dimensional illustration of a lead screw nut and a connector of the present application;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 7;

FIG. 9 is one of the structural schematic illustrations of the push rod and the connecting member of the present application;

FIG. 10 is a schematic illustration of a second embodiment of the push rod and connector of the present application;

FIG. 11 is a schematic third view of the push rod and the connecting member of the present application;

FIG. 12 is one of the structural schematic illustrations of the housing in the present application;

FIG. 13 is a second schematic illustration of the structure of the housing of the present application;

FIG. 14 is one of the structural schematic illustrations of the seal in the present application;

FIG. 15 is a second schematic illustration of the seal configuration of the present application;

FIG. 16 is a schematic third view of the seal in the present application;

FIG. 17 is a cross-sectional view taken along G-G in FIG. 16;

FIG. 18 is a fourth schematic illustration of the structure of the seal of the present application;

FIG. 19 is a fifth schematic illustration of the structure of the seal of the present application;

in the figure: 10-driving unit, 11-motor, 12-shell, 13-plug, 20-driving unit, 21-bevel gear, 22-bevel gear disk, 30-lead screw, 40-lead screw nut, 41-slider, 42-accommodation cavity, 43-ball socket, 44-rubber column, 45-screw connection part, 46-cotter pin, 50-connecting piece, 51-first connecting part, 52-retainer ring, 53-second connecting part, 54-conical piece, 55-ball head, 60-push rod, 61-first connecting piece, 62-second connecting piece, 63-car body mounting bracket, 70-shell, 71-chute, 72-sealing head, 80-car door mounting bracket, 81-mounting hole, 90-sealing piece, 91-sealing cap, 92-sealing disc, 93-sealing piece.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Examples: as shown in fig. 1 to 19, a door driving mechanism comprises a driving unit 10, a transmission unit 20, a screw rod 30, a screw rod nut 40, a connecting piece 50, a push rod 60 and a shell 70, wherein the shell 70 is installed in a door, the driving unit 10 is connected with the transmission unit 20, the transmission unit 20 is connected with the screw rod 30, the screw rod nut 40 is sleeved on the screw rod 30, the connecting piece 50 comprises a first connecting part 51 and a second connecting part 53 which are fixedly connected, the second connecting part 53 is movably installed in the screw rod nut 40, the first connecting part 51 is connected with a first end of the push rod 60, a second end of the push rod 60 is connected with the body, a sliding block 41 is arranged on the screw rod nut 40, a sliding groove 71 is arranged in the shell 70, and the screw rod nut 40 is slidably installed in the sliding groove 71 through the sliding block 41. The driving unit 10 can drive the screw rod 30 to rotate through the transmission unit 20, the screw rod 30 drives the screw rod nut 40 and the push rod 60 to perform reciprocating linear motion along the screw rod 30, and the push rod 60 drives the vehicle door to open and close relative to the vehicle body. As shown in fig. 1 to 3, the housing 70, the driving unit 10 and the transmission unit 20 are fixedly installed in the vehicle door, the transmission unit 20, the screw rod 30, the screw rod nut 40 and the push rod 60 are installed in the housing 70, the screw rod 30 is rotatably installed in the housing 70, and the screw rod nut 40 is slidably installed on the sliding groove 71 of the housing through the sliding block 41.

Taking the driving mechanism installed on the car door as an example, the car door is connected with the side wall of the car body through a car door hinge, so that the car door can rotate relative to the car body, the screw rod 30 can rotate around the axis of the car body under the action of the driving unit 10, and the screw rod nut 40 and the screw rod form a screw rod nut pair through threaded fit. As shown in fig. 3, a first end of the push rod 60 is connected to the screw nut 40 through the connecting piece 50, the push rod 60 can swing relative to the screw nut 40, and a second end of the push rod 60 is hinged to the vehicle body, so that when the screw nut 40 drives the push rod 60 to operate, the push rod 60 can swing relative to the vehicle door to adjust the proper position thereof, thereby ensuring the normal operation of the whole mechanism, in fig. 3, the state that the screw nut 40 is located at two different positions is shown, instead of having two screw nuts 40, in this embodiment, one screw is screwed to one screw nut.

According to the utility model, the screw rod only rotates and does not perform linear motion, so that the axial position of the screw rod can be limited, the envelope area of the screw rod is reduced, and the installation of a driving mechanism is facilitated; the screw rod nut is limited in the sliding groove of the shell to slide back and forth, so that the running stability of the driving mechanism is improved; meanwhile, the push rod is fixedly connected with the connecting piece, the connecting piece is movably connected with the screw nut, the manufacturing and assembling difficulties of the screw nut and the push rod are reduced, and the operation stability of the driving mechanism is improved.

As shown in fig. 8, the ball socket 43 is provided on the screw nut 40, the second connecting portion 53 is mounted in the ball socket 43, the second connecting portion 53 is locked in the ball socket 43 through the cotter pin 46, and as shown in fig. 3, the first connecting portion 51 and the push rod 60 are riveted together.

As shown in fig. 5-7, the two sides of the screw nut 40 are provided with the sliding blocks 41, the sliding blocks 41 are provided with accommodating cavities 42, rubber columns 44 are installed in the accommodating cavities 42, the lower ends of the screw nuts 40 are fixedly provided with screw connection parts 45, and the upper surfaces and the lower surfaces of the sliding blocks 41 are arc-shaped surfaces. As shown in fig. 5, the inner and outer sides of the screw nut 40 are provided with a sliding block 41, the upper and lower surfaces of the sliding block 41 are attached to a sliding groove 71 of the housing 70, the upper and lower surfaces of the sliding block are designed to be arc-shaped, the contact area between the sliding block and the housing is reduced, thereby reducing the friction force generated in the sliding block operation process, reducing the abrasion of the sliding block, a containing cavity 42 is arranged in the sliding block 41, and an elastic rubber column 44 is arranged in the containing cavity 42, so that the sliding block is flexibly contacted with the housing, the operation stability of the sliding block is ensured, the sliding block has a certain deformation space, the use requirement is met, and the screw connection part 45 is used for being screwed with the screw 30.

As shown in fig. 8, the second connecting portion 53 includes a tapered member 54 and a ball head 55, a first end of the tapered member 54 is fixedly connected to the first connecting portion 51, a second end of the tapered member 54 is fixedly connected to the ball head 55, a cross-sectional area of the first end of the tapered member 54 is larger than a cross-sectional area of the second end of the tapered member 54, the cotter pin 46 is clamped at a connection portion between the tapered member 54 and the ball head 55, the connecting portion 50 extends radially outwards to form a circle of retainer ring 52, and the retainer ring 52 is disposed at a connection portion between the first connecting portion 51 and the second connecting portion 53. The connecting piece 50 is an integral forming piece, the first connecting part 51, the conical piece 54 and the ball head 55 are fixed together in the forming process, the first connecting part 51 of the connecting piece 50 is in a columnar structure, the first connecting part 51 is riveted on the push rod 60, so that the combination stability of the connecting piece and the push rod is high, and the assembly is simpler, alternatively, the first connecting part 51 is rotatably riveted on the push rod 60, the second connecting part 53 comprises the ball head and the conical piece, as shown in fig. 8, the ball head 55 is rotatably arranged in the ball socket 43, the ball head 55 is clamped in the ball socket 43 through the C-shaped cotter pin 46, namely, the ball head 55 can swing in the ball socket 43 in a small amplitude but cannot be separated from the ball socket 43, the push rod 60 can swing relative to a vehicle door to adjust the proper position of the push rod, and therefore the normal operation of the whole mechanism is ensured; the swing of the ball head 55 is mainly limited by the two cotter pins 46, and the retainer ring 52 has the function of increasing the supporting surface when the connecting piece 50 is riveted with the push rod 60, so that the riveting strength is improved; the screw rod nut is connected with the push rod through the connecting piece, and the connecting piece is movably connected with the push rod and the screw rod nut, so that when the push rod swings relative to the vehicle door, the operation of the screw rod nut cannot be influenced, and the operation stability of the screw rod and the screw rod nut is improved.

As shown in fig. 9-11, a first end of the push rod 60 is provided with a first connector 61, a second end of the push rod 60 is provided with a second connector 62, both the first connector 61 and the second connector 62 are provided with pin holes, the first connector 51 is riveted in the pin holes of the first connector 61, and the second connector 62 is connected to the vehicle body mounting bracket 63 through pins. The body mounting bracket 63 is fixedly arranged in the body, namely the second connector 62 is connected with the body through the body mounting bracket 63, the push rod 60 is an integrated part, the first end of the push rod 60 is connected with the screw nut 40 through the connecting piece 50, the second end of the push rod 60 is hinged with the body through a pin, and when the screw nut drives the push rod 60 to move, the push rod can swing relative to the vehicle door to perform self-adaptive adjustment; the specific shape of the push rod 60 may be set according to the movement track thereof, alternatively, the push rod 60 may be a curved push rod, the cross section of which may be a circular, square or other structure, and when the push rod is curved, other structures on the vehicle door may be avoided.

As shown in fig. 1, the housing 70 is further provided with a door mounting bracket 80, the door mounting bracket 80 is fixedly connected to the housing 70, the door mounting bracket 80 is provided with a mounting hole 81, and the second end of the push rod 60 is disposed through the mounting hole 81. The bent push rod is limited to run in the mounting hole, so that the swing of the push rod is limited, the enveloping area of the movement of the push rod is reduced, other parts of the vehicle door are effectively avoided by the bent push rod, and the mounting space in the vehicle door is reduced. The door mounting bracket 80 and the housing 70 form a sealed space, the transmission unit 20, the screw rod 30 and the screw rod nut 40 are all located in the sealed space, the door mounting bracket 80 is mounted on the housing 70 through a fixing block, the fixing block and the housing 70 are welded and fixed, the door mounting bracket 80 and the fixing block are fixed through a screw joint, optionally, the push rod 60 penetrates out of the sealed space through an elastic sleeve in the mounting hole 81 to be connected with the vehicle body, and the elastic sleeve is in interference fit with the mounting hole. An elastic sleeve is arranged between the mounting hole 81 and the push rod 60, so that external pollutants can be effectively prevented from entering the sealing space through the mounting hole 81, and the components in the sealing space are polluted, thereby prolonging the service lives of the driving unit and the transmission unit; and even the push rod swings up and down by a certain amplitude, the push rod can be always attached to the elastic sleeve.

As shown in fig. 12-13, the housing 70 is an integral piece formed by extrusion of an aluminum profile, the sliding groove 71 is directly formed on the inner side of the housing 70, a first end of the housing 70 is sealed by a sealing head 72, a second end of the housing 70 is fixedly mounted on the door mounting bracket 80, the screw nut 40 is an integral piece, and the sliding blocks 41 are directly formed on two sides of the screw nut 40. In the extrusion molding process of the shell 70, the sliding groove 71 is directly formed on the inner side of the shell, the sealing head 72 is in interference fit with the shell 70, and as shown in fig. 5, the sliding blocks 41 are directly formed on the two sides of the screw nut 40 during molding, so that other parts are not required to be added to arrange the sliding groove and the sliding blocks, and the manufacturing cost of the driving mechanism is reduced; the shell 70 is formed by extrusion of aluminum profiles, and is easy to form and high in precision.

As shown in fig. 4, the transmission unit 20 includes a bevel gear 21 and a bevel gear disk 22 that are engaged with each other, the driving unit 10 is connected to the bevel gear 21, and the bevel gear disk 22 is sleeved on an outer ring slot of the screw rod 30 through an inner ring slot. The transmission unit of the application adopts the bevel gear 21 and the bevel gear disk 22, so that the transmission unit is simple and compact in structure, small in occupied space and suitable for mounting requirements of doors of various specifications. The screw 30 is installed in the housing 70 and the door mounting bracket 80 through bearings, so that axial play of the screw can be limited, the screw is supported, and smooth rotation of the conical fluted disc and the screw is ensured.

As shown in fig. 3, the driving unit 10 includes a motor 11, an output shaft of the motor 11 is fixedly connected to the bevel gear 21 in a circumferential direction, the bevel gear disk 22 is fixedly connected to the screw rod 30 in a circumferential direction, the output shaft of the motor 11 is vertically arranged with the screw rod 30, a plug 13 is connected to the motor 11, and the plug 13 is vertically arranged with the motor 11. The output shaft of the motor 11 can be directly and fixedly connected with the bevel gear 21, the bevel gear disk and the screw rod. During operation, the motor 11 drives the bevel gear 21 to rotate, the bevel gear drives the bevel gear disc 22 to rotate, the bevel gear disc drives the screw rod 30 to rotate, the screw rod rotates to drive the screw rod nut 40 to perform linear motion along the screw rod, and as shown in fig. 1 and 3, the plug 13 is vertically arranged with the motor 11, so that the size of the motor 11 in the axial direction can be shortened, the driving mechanism is more compact, and the occupied space of the driving mechanism is reduced.

As shown in fig. 14-19, the outer side of the motor 11 is sleeved with a casing 12, the motor 11 and the casing 12 are sealed by a sealing element 90, the sealing element 90 comprises a sealing cap 91 and a sealing disc 92 which are fixedly connected, the edge of the sealing disc 92 is provided with a sealing sheet 93, and the sealing sheet 93 protrudes out of the sealing disc 92 along the axial direction of the sealing disc 92. The sealing element 90 is made of flexible materials, the sealing element 90 can ensure the centering of the motor in the assembly process, can absorb a part of vibration during operation to play a role in noise reduction, and simultaneously plays a role in sealing, and the sealing effect of the sealing element 90 is further improved due to the design of the sealing piece 93, so that the end faces of the motor and the shell can be sealed.

The working principle of the utility model is as follows: as shown in fig. 2, the motor 11 drives the bevel gear 21 to rotate, the bevel gear 21 drives the bevel gear disk 22 to rotate, the bevel gear disk 22 drives the screw rod 30 to rotate, the screw rod rotates to enable the screw rod nut 40 to reciprocate along the screw rod and generate axial force, the screw rod nut 40 applies the axial force to the push rod 60 through the connecting piece 50, the push rod 60 applies the axial force to the vehicle body, and the vehicle body generates reaction force to act on the vehicle door to drive the vehicle door to automatically open or close.

It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A door drive mechanism, characterized in that: including drive unit (10), drive unit (20), lead screw (30), lead screw nut (40), connecting piece (50), push rod (60) and casing (70), casing (70) install in the door, drive unit (10) connect in drive unit (20), drive unit (20) connect in lead screw (30), lead screw nut (40) cover is located on lead screw (30), connecting piece (50) include fixed connection's first connecting portion (51) and second connecting portion (53), second connecting portion (53) movably install in lead screw nut (40), first connecting portion (51) connect in the first end of push rod (60), the second end of push rod (60) is connected in the automobile body, be equipped with slider (41) on lead screw nut (40), be equipped with spout (71) in casing (70), lead screw nut (40) pass through slider (41) slidingly install in spout (71).

2. The door drive mechanism according to claim 1, wherein: the screw nut (40) is provided with a ball socket (43), the second connecting part (53) is installed in the ball socket (43), the second connecting part (53) is clamped in the ball socket (43) through a cotter pin (46), and the first connecting part (51) and the push rod (60) are riveted together.

3. The door drive mechanism according to claim 2, wherein: the screw nut is characterized in that the sliding blocks (41) are arranged on two sides of the screw nut (40), a containing cavity (42) is formed in the sliding blocks (41), a rubber column (44) is arranged in the containing cavity (42), a screw connection portion (45) is fixedly arranged at the lower end of the screw nut (40), and the upper surface and the lower surface of the sliding blocks (41) are arc-shaped surfaces.

4. A door drive mechanism as set forth in claim 3, wherein: the second connecting portion (53) comprises a conical member (54) and a ball head (55), a first end of the conical member (54) is fixedly connected to the first connecting portion (51), a second end of the conical member (54) is fixedly connected to the ball head (55), the cross-sectional area of the first end of the conical member (54) is larger than that of the second end of the conical member (54), the cotter pin (46) is clamped at the joint of the conical member (54) and the ball head (55), the connecting member (50) extends outwards in the radial direction to form a circle of check ring (52), and the check ring (52) is arranged at the joint of the first connecting portion (51) and the second connecting portion (53).

5. The door drive mechanism according to claim 4, wherein: the first end of push rod (60) is equipped with first connector (61), the second end of push rod (60) is equipped with second connector (62), first connector (61) with all be equipped with the pinhole on second connector (62), first connecting portion (51) rivet in the pinhole of first connector (61), second connector (62) are through pin connection in automobile body installing support (63).

6. The door drive mechanism according to claim 1, wherein: the novel automobile door is characterized by further comprising an automobile door mounting bracket (80), wherein the automobile door mounting bracket (80) is fixedly connected to the shell (70), a mounting hole (81) is formed in the automobile door mounting bracket (80), and the second end of the push rod (60) penetrates through the mounting hole (81).

7. The door drive mechanism according to claim 6, wherein: the shell (70) is an integral part formed by extrusion of aluminum profiles, the sliding groove (71) is directly formed in the inner side of the shell (70), the first end of the shell (70) is sealed through a sealing head (72), the second end of the shell (70) is fixedly mounted on the vehicle door mounting bracket (80), the screw nut (40) is an integral part, and the sliding blocks (41) are directly formed on two sides of the screw nut (40).

8. The door drive mechanism according to claim 1, wherein: the transmission unit (20) comprises bevel gears (21) and bevel gear discs (22) which are meshed with each other, the driving unit (10) is connected to the bevel gears (21), and the bevel gear discs (22) are sleeved with outer ring clamping grooves of the screw rod (30) through inner ring clamping grooves.

9. The door drive mechanism as set forth in claim 8, wherein: the driving unit (10) comprises a motor (11), an output shaft of the motor (11) is fixedly connected with the bevel gear (21) in the circumferential direction, a bevel gear disc (22) is fixedly connected with the screw rod (30) in the circumferential direction, an output shaft of the motor (11) is vertically arranged with the screw rod (30), a plug (13) is connected to the motor (11), and the plug (13) is vertically arranged with the motor (11).

10. The door drive mechanism according to claim 9, wherein: the motor is characterized in that the outer side of the motor (11) is sleeved with the shell (12), the motor (11) and the shell (12) are sealed through a sealing piece (90), the sealing piece (90) comprises a sealing cap (91) and a sealing disc (92) which are fixedly connected, a sealing sheet (93) is arranged at the edge of the sealing disc (92), and the sealing sheet (93) protrudes out of the sealing disc (92) along the axial direction of the sealing disc (92).