Vehicle door driving mechanism

Abstract

The utility model provides a car door driving mechanism which comprises a shell part, a driving assembly, a limiting part, a spherical nut and a lead screw, the driving assembly comprises a driving part, a worm part and a worm meshing part which are arranged in the shell part, the worm part is connected to an output shaft of the driving part and is in meshing transmission with the worm meshing part, and the limiting part is arranged on the shell part. A first cavity is defined by the worm meshing part; the spherical nut is provided with an internal thread; the lead screw is provided with an external thread connected with the internal thread, one end of the lead screw is connected to a vehicle door, and the lead screw can drive the spherical nut to swing while moving along the axis of the lead screw. According to the vehicle door driving mechanism, the direct-drive type driving mechanism is adopted, the number of needed parts is greatly reduced, the size of the driving mechanism is correspondingly reduced, and cost is reduced. In addition, the matching structure is directly formed on the corresponding part, so that the assembly is convenient, the operation is stable, and the noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a vehicle door driving mechanism. Background Art

[0002] With the continuous improvement of automobile intelligence and comfort, electric door opening solutions for automobile side doors have been proposed, so that users do not need to manually open or close the doors. In the existing solutions, a motor is used to drive a lead screw nut device, which in turn drives a push rod to move, so that the push rod pushes the door to open or pulls the door to close.

[0003] For example, Chinese patent application CN114458110A discloses an arm-type electric door limiter, comprising a shell, a screw rod and a driving motor arranged in the shell, one end of the shell is provided with a fixed bracket for installation on the vehicle door, and the shell is provided with an arm rod at one end corresponding to the screw rod, the screw rod is movably connected to the shell, the outer peripheral surface of the screw rod is sleeved with a sliding screw sleeve threadedly connected to the screw rod, one end of the arm rod is hinged to the sliding screw sleeve, and the other end extends out of the shell and the fixed bracket, and a mounting frame is provided at the end thereof, one end of the mounting frame is fixedly connected to the vehicle body, and the other end is hinged to the arm rod through a first pin shaft, and a swinging groove for allowing the arm rod to move at the fixed bracket is opened on the fixed bracket, and the driving motor drives the screw rod to rotate in the shell through a gear transmission structure, so that the sliding screw sleeve drives the arm rod to move axially in the shell, thereby adjusting the distance between the fixed bracket and the mounting frame to realize opening and closing of the vehicle door.

[0004] However, this solution sets a lead screw nut in addition to the original push rod of the vehicle, has many parts, a complex structure and occupies a large space. In addition, since one end of the push rod is connected to the nut, and the nut also runs on the lead screw at the same time, the noise generated during operation is large and the operation stability is also low. Utility Model Content

[0005] The purpose of the present invention is to solve at least one of the above problems and / or other problems existing in the prior art.

[0006] To achieve the above object, the utility model provides a vehicle door driving mechanism, comprising:

[0007] A housing portion, the housing portion being fixed to the vehicle body;

[0008] A driving assembly, the driving assembly comprising a driving part, a worm part and a worm meshing part, the worm part is connected to an output shaft of the driving part and meshes with the worm meshing part for transmission, the worm meshing part forms a first cavity with first openings at both ends;

[0009] a spherical nut having an internal thread;

[0010] A screw rod, the screw rod having an external thread connected to the internal thread, one end of the screw rod being connected to the vehicle door, and the screw rod being able to drive the spherical nut to swing while moving along its own axis in the following manner:

[0011] (a) a limiting portion is provided in the first cavity, the limiting portion forms a second cavity with second openings at both ends, one of the worm gear engaging portion and the limiting portion is provided with a first protrusion, and the other is provided with a first groove capable of accommodating the first protrusion;

[0012] The outer peripheral wall of the spherical nut is matched with the inner peripheral wall of the limiting portion, one of the outer peripheral wall of the spherical nut and the inner peripheral wall of the limiting portion is provided with a second protrusion extending along the axial direction of the worm meshing portion, and the other is provided with a second groove matched with the second protrusion, and the second protrusion can move in the second groove; or

[0013] (b) The spherical nut is accommodated in the first cavity and its outer surface cooperates with the inner surface of the first cavity, one of the worm gear engaging portion or the spherical nut has a third groove extending along the axial direction of the worm gear engaging portion, and the other has a third protrusion capable of moving in the third groove.

[0014] According to an improvement of the utility model, the first cavity includes a cylindrical cavity and a hemispherical cavity arranged along the axial direction of the worm meshing portion, and the limiting portion includes a first cylindrical limiting portion and a second hemispherical limiting portion, the first limiting portion is arranged in the cylindrical cavity, and at least a part of the second limiting portion is arranged in the hemispherical cavity, and the first limiting portion and the second limiting portion are jointly arranged to form the second cavity.

[0015] According to an improvement of the utility model, the first limiting portion includes a fixing cover and an end cover arranged along its axial direction, and an elastic member sandwiched between the fixing cover and the end cover.

[0016] According to an improvement of the utility model, the first protrusion includes a first section and a second section, the first section is extended along the axial direction of the first limiting portion and is arranged on the outer peripheral wall of the first limiting portion, and the second section is extended along the axial direction of the first limiting portion and is arranged on the outer peripheral wall of the second limiting portion.

[0017] According to an improvement of the utility model, viewed along the axial direction of the second limiting portion, the two second sections arranged on the outer periphery of the second limiting portion are arranged opposite to each other, the two second protrusions arranged on the inner periphery of the second limiting portion are arranged opposite to each other, and the second sections and the second protrusions are arranged alternately at equal intervals.

[0018] According to an improvement of the utility model, the second cavity includes a first conical cavity and a first arc-shaped cavity which are distributed and connected along the axial direction of the first limiting portion, the cross-section of the first conical cavity gradually increases as it moves away from the first arc-shaped cavity, and a second opening is opened at a position of the first limiting portion corresponding to the large head end of the first conical cavity.

[0019] According to an improvement of the utility model, the second cavity also includes a second arc-shaped cavity arranged on the inner side of the second limiting portion, and the first limiting portion and the second limiting portion are spaced apart so that the first arc-shaped cavity and the second arc-shaped cavity are respectively attached to at least a portion of the outer peripheral wall of the spherical nut, and another second opening is opened at a position of the second limiting portion corresponding to the middle part of the second arc-shaped cavity.

[0020] According to an improvement of the utility model, the first cavity also includes a second conical cavity arranged on a side of the hemispherical cavity away from the cylindrical cavity and connected to the hemispherical cavity, and the cross-section of the second conical cavity gradually increases as it moves away from the hemispherical cavity.

[0021] According to an improvement of the utility model, the worm gear engaging portion is integrally formed and has two third grooves, and the spherical nut is mounted with two third protrusions having columnar portions located in the third grooves.

[0022] According to an improvement of the utility model, the worm gearing portion is further provided with another groove in the axial section where the third groove is provided, so as to reduce the contact area between the outer surface of the spherical nut and the inner surface of the worm gearing portion.

[0023] According to an improvement of the utility model, the vehicle door drive mechanism also includes a fixing plate and a dust cover connected to one end of the shell part, a first through hole for the screw rod to pass through is provided in the middle part of the fixing plate, an end of the screw rod away from the vehicle door is arranged in the dust cover, and a limiting device with a buffering function for limiting the stroke of the screw rod is provided at the end or in the dust cover.

[0024] According to an improvement of the utility model, the vehicle door drive mechanism further comprises a fixing bracket connected to the other end of the housing portion, and a second through hole for the screw rod to pass through is formed in the middle of the fixing bracket.

[0025] As can be seen from the above, the utility model proposes a direct-drive door drive mechanism, which directly drives the door through a screw rod without the need to use a push rod to push the door, thereby greatly reducing the number of parts required, correspondingly reducing the volume of the drive mechanism and reducing costs. In addition, the door drive mechanism uses a spherical nut and respectively sets matching protrusions and grooves on the outer circumferential wall of the spherical nut and the inner circumferential wall of the limiter, and directly molds the matching structure on the corresponding parts, which is convenient for assembly. The protrusion can slide in the groove, and the shape of the outer circumferential wall of the spherical nut is matched with the shape of the inner circumferential wall of the limiter, so that the screw rod can follow the door to swing while moving along its own axis, and the operation is stable and the noise is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The features and advantages of the present invention will be clearly understood through the detailed description provided below with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present invention, wherein:

[0027] Figure 1 An exploded view of a vehicle door driving mechanism according to an exemplary embodiment of the present invention is shown.

[0028] Figure 2 Show Figure 1 The overall structural schematic diagram of the door drive mechanism is shown.

[0029] Figure 3 Show Figure 1 The internal schematic diagram of the door drive mechanism shown.

[0030] Figure 4 Show Figure 1 An exploded view of the worm engagement portion, stop portion, ball nut and lead screw of the vehicle door drive mechanism is shown.

[0031] Figure 5 A schematic diagram of a door drive mechanism according to another exemplary embodiment of the present utility model is shown without a lead screw and a ball nut.

[0032] Figure 6 Show Figure 5 Exploded view of the door drive mechanism shown.

[0033] Figure 7 Show Figure 5 Left side view of the door drive mechanism shown.

[0034] Figure 8 Show Figure 7 The door drive mechanism is shown in a cross-sectional view along line AA.

[0035] Fig. 9 Show Figure 7 The door drive mechanism is shown in a cross-sectional view along line BB.

[0036] Fig.10 Show Figure 7 The illustrated embodiment is an exploded cross-sectional view of the limiting portion of the door drive mechanism along line AA.

[0037] Fig.11 Show Figure 7 The illustrated embodiment is an exploded cross-sectional view of the limiting portion of the door drive mechanism along line BB.

[0038] Fig.12 An exploded schematic diagram of a worm gear engaging portion and a ball nut of a vehicle door drive mechanism according to yet another exemplary embodiment of the present utility model is shown.

[0039] Fig.13 Shows Fig.12 Overall schematic diagram of the worm gear meshing part and the ball nut. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless clearly stated in the claims.

[0041] In the following description, the descriptions about directions, such as "upper", "lower", "inner", "outer", "radial", "axial", etc., which may be used, are only for the convenience of description, unless otherwise specified, and are not intended to form any limitation on the technical solution of the utility model. In the following, terms such as "first", "second", etc. are used to describe the elements of the present application. These terms are only used to distinguish the elements, not to limit the nature, order or number of these elements. The terms "including" and "having" are used to express the meaning of open inclusion, and mean that there may be additional elements / components in addition to the listed elements / components.

[0042] The vehicle door driving mechanism of the utility model is used to drive the electric door to open or close, especially for the vehicle door located at the door frame on the side of the vehicle body. The vehicle door is usually connected to the vehicle body by a hinge, such as at the door frame, and the vehicle door is opened or closed by driving the vehicle door driving mechanism to change the opening angle.

[0043] Figures 1 to 4 An embodiment of the vehicle door driving mechanism of the utility model is shown. Figures 5 to 11 Another embodiment of the vehicle door drive mechanism of the utility model is shown. A major difference between the two embodiments is that the limiting portion arranged between the worm engagement portion and the ball nut is different. In the two embodiments, the same elements are described with the same reference numerals.

[0044] See for example Figures 2 to 5 In general, the door drive mechanism of the utility model includes a housing portion 10, a drive assembly 20, a limit portion, a ball nut 50 and a screw 70. The housing portion 10 is directly fixed to the vehicle body (for example, by bolts), or can be indirectly fixed to the vehicle body through a fixing bracket 100 (the fixing bracket 100 will be described in detail below). The drive assembly 20 includes a drive portion 21, a worm portion 22 and a worm meshing portion 23, which are respectively arranged in the housing. The worm portion 22 is connected to the output shaft of the drive portion 21 (for example, a drive motor) so that it can rotate synchronously under the drive of the output shaft. At the same time, the tooth portion of the worm portion 22 is meshed with the worm meshing portion 23 for transmission. Since the axial directions of the worm and the worm wheel are arranged perpendicular to each other, the power output direction of the drive motor can be changed. In the scheme of the utility model, the worm meshing portion 23 can be in the form of a worm wheel or a helical gear.

[0045] Figure 4 and Figure 6 shows a perspective view of the worm gearing 23, Fig.10 and Fig.11 The internal structure of the worm gearing part 23 is shown in a cross-sectional view. As can be seen from the figure, the worm gearing part 23 has a first cavity 231 in the middle, and the two ends of the first cavity 231 have first openings 2311 respectively. The limiting part is arranged in the first cavity 231, and the limiting part has an outer wall that matches the shape of the side wall of the worm gearing part 23 corresponding to the first cavity 231, and the shape can be any shape, such as a cylindrical body, a spherical body or a combination of any of the above shapes, so that the limiting part can be embedded in the first cavity 231 of the worm gearing part 23. The limiting part has a second cavity 31, and the two ends of the second cavity 31 have second openings 311 respectively. The spherical nut 50 is arranged in the second cavity 31, and its outer circumferential wall is compatible with the inner circumferential wall of the limiting portion. For example, the outer circumference of the spherical nut 50 is generally spherical or approximately spherical in shape, and the shape of the second cavity 31 formed by the limiting portion is also generally spherical or approximately spherical in shape, so that the spherical nut 50 can rotate in the cavity of the limiting portion.

[0046] See also Figure 4One end of the screw rod 70 is connected to a vehicle door (not shown), and a mounting bracket 72 for connecting to the vehicle door may be provided at one end of the screw rod 70, and the mounting bracket 72 is rotatably connected to the vehicle door, thereby indirectly connecting the vehicle door to one end of the screw rod 70. The screw rod 70 passes through the Fig.10 and Fig.11 The first opening 2311 and the second opening 311 on the left side are threadedly connected to the center of the ball nut 50, and then pass through the first opening 2311 and the second opening 311 on the right side. The installation relationship between the screw rod 70, the nut and the limiter can also be seen from Figure 3 The worm drives the worm meshing portion and thereby drives the ball nut 50 to rotate, so that the screw rod 70 can extend or retract relative to the left side of the ball nut 50, thereby realizing the opening or closing of the door.

[0047] See also Figure 4 and Figure 6 In order to effectively transmit the power of the driving part 21 to the spherical nut 50, a first protrusion 41 may be provided on one of the worm meshing part 23 and the limiting part, and a first groove 42 matched with the first protrusion 41 may be provided on the other. The first protrusion 41 and the first groove 42 may be configured to have functions similar to splines and keyways, so that the worm meshing part 23 and the limiting part can be in concave-convex contact at at least a portion of the position of both to transmit power. Similarly, a second protrusion 61 staggered in the circumferential direction from the first protrusion 41 and the first groove 42 along the screw 70 is provided on one of the outer circumferential wall of the spherical nut 50 and the inner circumferential wall of the limiting part, and a second groove 62 matched with the second protrusion 61 is correspondingly provided on the other. For example, in the case of Figure 1 and Figure 4 In the embodiment shown, the second groove 62 is provided on the inner peripheral wall of the second limiting portion 33, and the second protrusion 61 is provided on the outer surface of the spherical nut 50. Figure 6 and Fig.10 In the illustrated embodiment, the second groove 62 can be provided on the outer surface of the ball nut 50, and the second protrusion 61 can be provided on the inner peripheral wall of the second limiting portion 33. The second protrusion 61 and the second groove 62 enable the ball nut 50 and the limiting portion to be in concave-convex contact at least in part of the position of the two to transmit power. In combination with the above embodiment, the power can be conveniently and smoothly transmitted from the driving portion 21 to the ball nut 50 via the worm portion 22, the worm meshing portion 23 and the limiting portion in sequence to drive the ball nut 50 to rotate, and the screw can be swung relative to the axis of the worm meshing portion through the connection between the worm meshing portion, the limiting portion and the nut.

[0048] An important improvement of the utility model is that in the prior art, the automatic full opening and automatic closing of the car door are realized by swinging the ball head in the ball socket along the swing groove inserted in the ball head linkage shaft. Although the automatic full opening and automatic closing of the car door are realized, the number of components is large, the assembly is relatively complicated, and the ball head linkage shaft may fall off during the assembly process. Compared with the prior art, the matching structure of the utility model is directly formed on the corresponding component, and there is no need to assemble multiple components separately. Since the second protrusion 61 is arranged along the axial extension of the screw rod 70, and the shape of the outer peripheral wall of the ball nut is adapted to the shape of the inner peripheral wall of the limit portion, when the car door is opened or closed, the screw rod 70 drives the ball nut 50 to swing at a certain angle in the second cavity 31, and the inner peripheral wall of the ball nut 50 always fits the inner wall of the second cavity 31 to swing, thereby ensuring that the second protrusion 61 is always located in the second groove 62, and the two are not easy to slip off, and the matching of the protrusion and the groove makes the operation more stable.

[0049] The utility model does not limit the specific structure of the driving part 21. For example, the driving part 21 can be a driving motor, preferably a servo motor, a stepper motor, a torque motor, a switched reluctance motor and a brushless DC motor. Of course, other types of motors can also be selected as needed. The worm part 22 is directly connected to the output shaft of the driving motor to directly output the power of the motor. In addition, the driving part 21 can also use a transmission mechanism such as a planetary gear transmission mechanism or a multi-stage fixed axis gear transmission mechanism to output the power of the motor.

[0050] According to an exemplary embodiment of the first cavity 231 formed by the worm gear engaging portion 23, as shown in FIG. Fig.10 and Fig.11 As shown, the first cavity 231 includes a cylindrical cavity 2312 and a hemispherical cavity 2313 arranged along the axial direction of the worm gear engagement portion 23. The limiting portion includes a cylindrical first limiting portion 32 and a hemispherical second limiting portion 33, the first limiting portion 32 is arranged in the cylindrical cavity 2312, the second limiting portion 33 is arranged in the hemispherical cavity 2313, and the first limiting portion 32 and the second limiting portion 33 are jointly arranged to form the second cavity 31. Specifically, the first limiting portion 32 and the second limiting portion 33 can be arranged in abutment, and the second cavity 31 formed by the first limiting portion 32 and the second limiting portion 33 abutting each other is an open structure formed only at the two second openings 311. The first limiting portion 32 and the second limiting portion 33 can also be non-abutting, and at this time, the first limiting portion 32 and the second limiting portion 33 are respectively abutted with at least a portion of the spherical nut 50, which can adapt to spherical nuts 50 of more diameters or specifications and have better compatibility.

[0051] like Figure 1 and Figure 4As shown, in one embodiment, the first limiting portion 32 includes a fixed cover 321, an end cover 322, and an elastic member 323 sandwiched between the fixed cover 321 and the end cover 322, which are arranged along the axial direction thereof. The elastic member 323 enables the fixed cover 321 to move along the axial direction, thereby eliminating the gap between the fixed cover 321 and the spherical nut 50. The fixed cover 321 surrounds a part of the second cavity 31, so that the fixed cover 321 can fit with at least a part of the spherical nut 50. The end cover 322 is connected to the inner end of the left end of the worm gear engagement portion by bolts, closing the left end of the second cavity 31 and forming a second opening 311 through which the screw rod 70 passes. When the spherical nut 50 is clamped between the second limiting portion 33 and the fixing cover 321, the axial pre-tightening force of the end cover 322 on the elastic member 323 can ensure that the spherical nut 50 and the fixing cover 321 are in surface contact, which can withstand a larger load and reduce the axial movement of the spherical nut 50 relative to the fixing cover 321, thereby reducing the abnormal noise generated when the door swings. In this embodiment, the first protrusion 41 is respectively arranged on the outer surfaces of the fixing cover 321, the end cover 322 and the second limiting portion 33.

[0052] According to an exemplary embodiment of the first protrusion 41 of the present invention, Figure 6 , Fig.10 and Fig.11 As shown, the first protrusion 41 includes a first section 411 and a second section 412. The first section 411 is provided on the outer peripheral wall of the first limiting portion 32 along the axial direction of the first limiting portion 32, and the second section 412 is provided on the outer peripheral wall of the second limiting portion 33 along the extension direction of the first section 411. Correspondingly, the first groove 42 is provided on the inner peripheral wall of the worm gearing portion 23 along the axial direction of the worm gearing portion 23. In this way, when the limiting portion and the ball nut are installed to the inner side of the worm gearing portion, the second limiting portion 33 can be placed first, so that the second section 412 provided on the second limiting portion 33 slides to the hemispherical cavity 2313 through the second groove 62. Then, after the ball nut is placed, the first section 411 provided on the first limiting portion 32 slides through the second groove 62 until it abuts against the ball nut.

[0053] According to a preferred embodiment of the utility model, the first protrusion 41 and the second protrusion 61 are combined Figures 6 to 11 As shown, the number of the first protrusion 41 and the second protrusion 61 are both two, and viewed along the axial direction of the second position-limiting portion 33, the two second sections 412 disposed on the second position-limiting portion 33 are disposed opposite to each other (i.e., spaced 180° apart from each other) and extend outward from the outer circumferential surface of the second position-limiting portion 33, so that the second section 412 can be completely embedded in the first groove 42. The two second protrusions 61 disposed on the inner circumference of the second position-limiting portion 33 are disposed opposite to each other (i.e., spaced 180° apart from each other) and extend inward from the inner circumferential surface of the second position-limiting portion 33.

[0054] According to an exemplary embodiment of the second cavity 31 of the present invention, Fig.10 and Fig.11 As shown, the second cavity 31 includes a first conical cavity 312 and a first arc cavity 313 that are distributed and connected along the axial direction of the first limiting portion 32. The cross-section of the first conical cavity 312 gradually increases as it moves away from the first arc cavity 313, so that the screw rod 70 can be avoided when the screw rod 70 deflects. It is defined here that the end of the first conical cavity 312 close to the first arc cavity 313 is the first small head end, and the end away from the first arc cavity 313 is the first large head end. The first arc cavity 313 faces the side where the spherical nut 50 is located (such as Figure 3 The ball nut 50 shown is located on the left side or the left side of the first limiting portion 32. Fig. 9 The ball nut 50 shown is located at the lower side of the first limiting portion 32 and is configured to accommodate at least a portion of the ball nut 50 (such as Figure 3 The right part of the ball nut 50 shown or Fig. 9 The upper part of the spherical nut 50 shown in the figure) enables the spherical nut 50 to abut against the inner wall of the first limiting portion 32 corresponding to the first arc cavity 313. A second opening 311 is opened at the first large end of the first limiting portion 32 corresponding to the first cone cavity 312.

[0055] In a further embodiment, the second cavity 31 further includes a second arc cavity 314 disposed inside the second limiting portion 33, and the second arc cavity 314 faces the side where the spherical nut 50 is located (eg, Figure 3 The ball nut 50 shown is located on the right side of the second limiting portion 33 or Fig. 9 The spherical nut 50 is located on the upper side of the second limiting portion 33, so that when the first limiting portion 32 and the second limiting portion 33 are spaced apart, the first arc-shaped cavity 313 is respectively attached to at least a portion of the outer peripheral wall of the spherical nut 50 (such as Figure 3 The left or Fig. 9 Another second opening 311 is opened at a position of the second limiting portion 33 corresponding to the middle of the second arc cavity 314, so that the screw rod 70 can pass through the second opening 311 on the left, the spherical nut 50 and the second opening 311 on the right in sequence.

[0056] Furthermore, the first cavity 231 also includes a second cone cavity 2314 disposed on the side of the hemispherical cavity 2313 away from the cylindrical cavity 2312, and the cross section of the second cone cavity 2314 gradually increases as it moves away from the hemispherical cavity 2313, so the side of the second cone cavity 2314 close to the hemispherical cavity 2313 can be defined as the second small end, and the side away from the hemispherical cavity 2313 can be defined as the second large end. Through the provision of the second cone cavity 2314, a position for avoiding the screw 70 when the screw 70 has a deflection angle can be formed on the right side of the inner circumferential wall of the worm gear engagement portion 23. It can be understood that a first opening 2311 is disposed at one end of the first limiting portion 32 corresponding to the cylindrical cavity 2312 away from the hemispherical cavity 2313, and another first opening 2311 is disposed at one end of the second cone cavity 2314 away from the hemispherical cavity 2313, so that the inner circumference of the entire worm gear engagement portion 23 forms a nearly tubular structure.

[0057] Fig.12 An exploded schematic diagram of a worm gear engaging portion and a ball nut of a vehicle door drive mechanism according to yet another exemplary embodiment of the present utility model is shown. Fig.13 Shows Fig.12 The overall schematic diagram of the worm gear meshing part and the ball nut. Fig.12 and Fig.13 It can be seen that in this embodiment, there is no longer an intermediate limiting portion, but the outer surface of the ball nut 50 directly contacts the inner surface of the worm gear engaging portion 23. Specifically, the ball nut 50 is accommodated in the first cavity 231 and its outer surface cooperates with the inner surface of the first cavity 231. As an example, a third groove 43 extending along the axial direction of the worm gear engaging portion 23 is provided on the worm gear engaging portion 23, and a third protrusion 63 capable of moving in the third groove 43 is provided on the ball nut. Of course, the positions of the third groove 43 and the third protrusion 63 can be interchanged as long as the two can cooperate with each other.

[0058] As a preferred embodiment, the worm gearing portion 23 is integrally formed. Specifically, the worm gearing portion 23 is a plastic part, and the ball nut 50 is a metal part. The worm gearing portion 23 is formed as an integral part by insert injection molding, and an inner surface that matches the outer surface of the ball nut 50 is formed in the worm gearing portion 23, and the ball nut 50 is directly located in the worm gearing portion 23, eliminating the assembly process.

[0059] Preferably, the number of the third grooves 43 can be multiple, for example, two, and the two grooves are arranged 180° apart in the circumferential direction. Accordingly, the third protrusion 63 can be installed in the hole of the ball nut 50 in a structure similar to a pin.

[0060] Furthermore, it is also conceivable that another groove 44 is provided in the axial section of the worm gearing 23 where the third groove 43 is provided, so as to reduce the contact area between the outer surface of the ball nut 50 and the inner surface of the worm gearing 23, thereby reducing friction and making the operation smoother.

[0061] According to an exemplary embodiment of the housing portion 10, Figure 1 As shown, the openings at both ends of the housing 10 are relatively closed, and the stopper, ball nut 50 and other components cannot be directly installed inside the housing 10, so the housing 10 is divided into two to form a first housing 13 and a second housing 14 that are approximately symmetrical. Figure 5 In the illustrated embodiment, one end of the shell portion 10 has a relatively large opening, and components such as the limiting portion and the spherical nut 50 can be directly installed inside the shell portion 10. The shell portion 10 can also be an integral structure, and the relatively large opening of the shell portion 10 can be closed by some components (such as a fixing bracket 100).

[0062] According to a further embodiment of the door driving structure, Figure 1 and Figure 5 As shown, the door drive mechanism also includes a fixing plate 80 and a dust cover 90 connected to one end of the housing portion 10. A first through hole 81 for the screw rod 70 to pass through is provided in the middle of the fixing plate 80, and the end of the screw rod 70 away from the door passes through the first through hole 81 and is arranged in the dust cover 90. A retaining spring 71 is provided at the end of the screw rod 70 arranged in the dust cover 90, and the inner ring of the retaining spring 71 is elastically clamped at the end of the screw rod 70 to fix it with the screw rod 70, thereby providing a limit to the stroke of the screw rod. As another feasible alternative, a buffer and stop structure can also be provided to achieve the stroke limit of the screw rod. For example, a baffle and a buffer gasket can be provided at a predetermined position of the dust cover 90, so that when the end of the screw rod contacts the buffer gasket, it can be restricted without generating vibration and noise. Of course, the buffer gasket and / or the baffle can also be provided at the end of the screw rod.

[0063] Furthermore, the door driving mechanism further includes a fixing bracket 100 connected to the other end of the housing 10 (the end away from the fixing plate 80). A second through hole 101 is provided in the middle of the fixing bracket 100 for the screw rod 70 to pass through. After the screw rod 70 passes through the second through hole 101, Figure 3 The left side portion of the screw rod 70 is shown to be disposed in a bellows 110. The bellows 110 is disposed between the mounting bracket 72 and the fixing bracket 100. By providing the bellows 110, the impact of the vehicle on the screw rod 70 during driving is absorbed, and when the spacing between the mounting bracket 72 and the fixing bracket 100 changes, the bellows 110 will not be damaged due to stretching or compression, which is beneficial to protecting the screw rod 70 from the impact of the external environment (such as dust, water vapor).

[0064] like Figure 1 or Figure 6 As shown, the fixing bracket 100 is a generally square structure, and fixing ears 102 are respectively extended outward on two opposite sides thereof, and each fixing ear 102 is provided with a first mounting hole 103. Bolts pass through the first mounting holes 103 to connect the fixing bracket 100 and the shell part 10 to the vehicle body.

[0065] Regarding the fixing method of the dust cover 90, the fixing plate 80, the housing portion 10 and the fixing bracket 100, in order to reduce unnecessary manufacturing costs, the embodiment of the utility model connects the dust cover 90, the fixing plate 80, the housing portion 10 and the fixing bracket 100 at the same time by bolts, such as Figure 1 and Figure 6 As shown, from the circumference of the screw rod 70, the dust cover 90 is provided with four second mounting holes 91 at equal intervals in the circumference, the fixing plate 80 is provided with four third mounting holes 82 at equal intervals in the circumference, the housing portion 10 is provided with mounting columns 12 with fourth mounting holes 11 at equal intervals in the circumference, and the fixing bracket 100 is provided with four fifth mounting holes (not shown) at equal intervals in the circumference. After the bolt passes through the second mounting hole 91, the third mounting hole 82, the fourth mounting hole 11 and the fifth mounting hole (not shown), the dust cover 90, the fixing plate 80, the housing portion 10 and the fixing bracket 100 can be connected at the same time. Of course, the number of mounting holes on the same component can also be two, three or even more, depending on the installation strength of each component. In some other embodiments, the connection between the dust cover 90, the fixing plate 80, the fixing bracket 100 and the shell part 10 can also be a split connection, that is, the dust cover 90 and the fixing plate 80 are connected to the shell part 10 by bolts or other means, and the fixing bracket 100 is connected to the shell part 10 by bolts or other means.

[0066] The two ends of the worm gear engaging portion 23 are connected to the two ends of the inner wall of the housing portion 10 through a bearing 120, so that the worm gear engaging portion 23 is supported in the housing portion 10 through the bearing 120, thereby increasing the stability of the worm gear engaging portion 23 during the rotation process. Figure 3 , Fig.10 and Fig.11 The two ends of the worm gear meshing portion 23 close to the fixing bracket 100 and the fixing plate 80 are respectively provided with shaft shoulders 232, and the inner ring of each bearing 120 is respectively in contact with the shaft shoulders 232. After the fixing bracket 100 and the fixing plate 80 respectively seal the two ends of the housing portion 10, the outer rings of the two bearings 120 are respectively in contact with the fixing bracket 100 and the fixing plate 80, so that the two bearings 120 and the worm gear meshing portion 23 are respectively limited in the axial direction by the fixing bracket 100 and the fixing plate 80.

[0067] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from the practice of the utility model disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the utility model is specified by the appended claims and their equivalents.

Claims

1. A door driving mechanism, comprising: A housing portion (10), wherein the housing portion (10) is fixed to the vehicle body; A drive assembly (20), the drive assembly (20) comprising a drive portion (21), a worm portion (22) and a worm meshing portion (23), the worm portion (22) being connected to an output shaft of the drive portion (21) and meshingly transmitting with the worm meshing portion (23), the worm meshing portion (23) forming a first cavity (231) having first openings (2311) at both ends; A spherical nut (50), wherein the spherical nut (50) has an internal thread; A screw rod (70) having an external thread connected to the internal thread, one end of the screw rod being connected to the vehicle door, The invention is characterized in that the screw rod can drive the spherical nut (50) to swing while moving along its own axis in the following manner: (a) a limiting portion is provided in the first cavity (231), the limiting portion is formed with a second cavity (31) having second openings (311) at both ends, one of the worm gear engaging portion (23) and the limiting portion is provided with a first protrusion (41), and the other is provided with a first groove (42) adapted to the first protrusion (41); The outer peripheral wall of the spherical nut (50) is matched with the inner peripheral wall of the limiting portion, one of the outer peripheral wall of the spherical nut (50) and the inner peripheral wall of the limiting portion is provided with a second protrusion (61) extending along the axial direction of the worm gear engaging portion (23), and the other is provided with a second groove (62) capable of accommodating the second protrusion (61), and the second protrusion can move in the second groove; or (b) The spherical nut (50) is accommodated in the first cavity (231) and its outer surface cooperates with the inner surface of the first cavity (231), and one of the worm gear engaging portion (23) or the spherical nut (50) has a third groove (43) extending along the axial direction of the worm gear engaging portion (23), and the other has a third protrusion (63) capable of moving in the third groove (43).

2. The door drive mechanism according to claim 1, characterized in that: The first cavity (231) comprises a cylindrical cavity (2312) and a hemispherical cavity (2313) arranged along the axial direction of the worm gear meshing portion (23); the limiting portion comprises a first cylindrical limiting portion (32) and a second hemispherical limiting portion (33); the first limiting portion (32) is arranged in the cylindrical cavity (2312); at least a part of the second limiting portion (33) is arranged in the hemispherical cavity (2313); the first limiting portion (32) and the second limiting portion (33) are jointly arranged to form the second cavity (31).

3. The door drive mechanism according to claim 2, characterized in that: The first limiting portion (32) comprises a fixing cover (321) arranged along its axial direction, an end cover (322), and an elastic member (323) sandwiched between the fixing cover (321) and the end cover (322).

4. The door drive mechanism according to claim 2, characterized in that: The first protrusion (41) comprises a first section (411) and a second section (412), wherein the first section (411) is arranged on the outer peripheral wall of the first limiting section (32) along the axial extension of the first limiting section (32), and the second section (412) is arranged on the outer peripheral wall of the second limiting section (33) along the axial extension of the first limiting section (32).

5. The door drive mechanism according to claim 4, characterized in that: When viewed along the axial direction of the second limiting portion (33), the two second sections (412) arranged on the outer periphery of the second limiting portion (33) are arranged opposite to each other, and the two second protrusions (61) arranged on the inner periphery of the second limiting portion (33) are arranged opposite to each other, and the second sections (412) and the second protrusions (61) are arranged alternately at equal intervals.

6. The door drive mechanism according to claim 2, characterized in that: The second cavity (31) comprises a first conical cavity (312) and a first arc-shaped cavity (313) which are distributed and connected along the axial direction of the first limiting portion (32); the cross section of the first conical cavity (312) gradually increases as it moves away from the first arc-shaped cavity (313); and a second opening (311) is provided at a position of the first limiting portion (32) corresponding to the large end of the first conical cavity (312).

7. The door drive mechanism according to claim 6, characterized in that: The second cavity (31) also includes a second arc-shaped cavity (314) arranged on the inner side of the second limiting portion (33), and the first limiting portion (32) and the second limiting portion (33) are arranged at intervals so that the first arc-shaped cavity (313) and the second arc-shaped cavity (314) are respectively attached to at least a portion of the outer peripheral wall of the spherical nut (50), and another second opening (311) is opened at a position of the second limiting portion (33) corresponding to the middle of the second arc-shaped cavity (314).

8. The door driving mechanism according to claim 6, characterized in that: The first cavity (231) further comprises a second conical cavity (2314) which is arranged on a side of the hemispherical cavity (2313) away from the cylindrical cavity (2312) and is connected to the hemispherical cavity (2313), and the cross-section of the second conical cavity (2314) gradually increases as it moves away from the hemispherical cavity (2313).

9. The door driving mechanism according to claim 1, characterized in that: The worm gear engaging portion (23) is integrally formed and has two third grooves (43), and the spherical nut (50) is mounted with two third protrusions (63) having columnar portions located in the third grooves (43).

10. The door driving mechanism according to claim 9, characterized in that: The worm gearing portion (23) is further provided with another groove (44) in the axial section where the third groove (43) is provided, so as to reduce the contact area between the outer surface of the ball nut (50) and the inner surface of the worm gearing portion (23).

11. The vehicle door driving mechanism according to any one of claims 1 to 10, characterized in that: The vehicle door drive mechanism also includes a fixing plate (80) and a dust cover (90) connected to one end of the housing portion (10); a first through hole (81) for the screw rod (70) to pass through is provided in the middle of the fixing plate (80); an end of the screw rod (70) away from the vehicle door is arranged in the dust cover (90); and a limiting device with a buffering function for limiting the stroke of the screw rod (70) is provided in the end or in the dust cover (90).

12. The vehicle door driving mechanism according to claim 11, characterized in that: The door drive mechanism further comprises a fixing bracket (100) connected to the other end of the housing portion (10), and a second through hole (101) for the screw rod (70) to pass through is provided in the middle of the fixing bracket (100).

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