Vehicle door driving mechanism

Abstract

The utility model relates to a vehicle door driving mechanism, which comprises a motor; a power output device; the power transmission device is connected with the power output device; the sliding block is connected with the power transmission device; one end of the vehicle door push rod is connected to the sliding block, and the other end of the vehicle door push rod is connected to a vehicle door; the sliding block comprises an upper sliding block body and a lower sliding block body, and the upper sliding block body and the lower sliding block body are provided with a first contact face and a second contact face which are matched with each other in the X direction parallel to the power transmission device, so that the upper sliding block body and the lower sliding block body can limit the upper sliding block body and the lower sliding block body from moving in the X direction. The upper slider and the lower slider are allowed to rotate relative to each other in a Y direction orthogonal to the X direction, and the Z direction is orthogonal to both the X direction and the Y direction and is substantially parallel to the rotation direction of the vehicle door. The sliding block is arranged to be of a split type structure, the upper sliding block and the lower sliding block are matched with each other, deformation generated between threaded connection of the sliding block and the lead screw is avoided, and stress, friction and abrasion are reduced.

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] The vehicle has multiple doors, such as the side doors for the driver or passengers to get on the vehicle and the tailgate for closing the trunk. Since it is inconvenient for the user to open the tailgate by hand when holding something, the electric tailgate was first developed and has been widely used in vehicles. With the further development of the intelligence of automobiles, the side doors of vehicles have also begun to be opened or closed gradually by electric means. One known solution is to use a motor to drive the screw to rotate, and set a nut that can be threadedly connected to the screw on the slider, so that the slider can be displaced relative to the screw, and then connect the slider to the door push rod, and then connect the push rod to the car body, so as to realize the electric opening and closing of the side door.

[0003] For example, Chinese patent application CN 114718410A discloses a novel electric side door driver for automobiles, which includes a housing, a screw rod, a slider, a push rod and a guide rod. The central axes of the screw rod, the push rod and the guide rod are parallel to each other and are in the same plane. The slider is not only threadedly connected to the screw rod, but also slidably sleeved on the guide rod and connected to one end of the push rod through a sleeve. Utility Model Content

[0004] The applicant found that, for the device in the prior art, in actual operation, since one end of the push rod moves with the door and the other end is connected to the fixed part, the push rod itself has a certain swing. When the push rod is subjected to force, it will transfer the force to the slider, so that the slider has a tendency to tilt relative to the lead screw. The tilting tendency of the slider will cause the threaded connection between the slider and the lead screw inside it to be subjected to an unexpected force, which may cause damage to the threaded connection and unstable operation.

[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 objectives, the utility model provides the following solutions.

[0007] A vehicle door driving mechanism, comprising:

[0008] Electric motor;

[0009] a power output device connected to the electric motor;

[0010] a power transmission device connected to the power output device;

[0011] a slider connected to the power transmission device;

[0012] A door push rod, one end of which is connected to the slider and the other end of which is connected to the door;

[0013] The slider includes an upper slider and a lower slider, and the upper slider and the lower slider have a first contact surface and a second contact surface that match each other in the X direction parallel to the power transmission device, so that the upper slider and the lower slider can limit the movement of the upper slider and the lower slider in the X direction, and allow the upper slider and the lower slider to rotate relative to each other in the Y direction orthogonal to the X direction, and the Z direction is orthogonal to both the X direction and the Y direction and is roughly parallel to the rotation direction of the vehicle door.

[0014] According to an improvement of the utility model, the power output device includes a worm connected to the motor and a helical gear meshing with the worm.

[0015] According to an improvement of the utility model, the power transmission device is a screw.

[0016] According to an improvement of the utility model, the upper slider has a structure that cooperates with the power transmission device, so as to convert the rotational motion of the power transmission device into the linear motion of the upper slider along the X direction.

[0017] According to an improvement of the utility model, the first contact surface is a curved surface, the second contact surface is a flat surface, the first contact surface is formed on the upper slider, the second contact surface is formed on the lower slider, and the first contact surface contacts with a second contact surface on both sides respectively.

[0018] According to an improvement of the utility model, the upper slider has two first side surfaces perpendicular to the X direction, and the first side surfaces respectively cooperate with corresponding side surfaces of the lower slider to limit the rotation angle between the upper slider and the lower slider.

[0019] According to an improvement of the utility model, the upper slider has a first cylindrical surface with the X direction as the axis, a second cylindrical surface with the Y direction as the axis and two second side surfaces perpendicular to the Y direction, and the cylinder forming the second cylindrical surface extends from both sides in the Y direction beyond the two second side surfaces to form at least a portion of the first contact surface.

[0020] According to an improvement of the utility model, it also includes a door push rod connecting device, which includes a pin shaft arranged along the Z direction, a rotating part provided with a hole for accommodating the pin shaft, and a door push rod connecting part cooperating with the rotating part, the door push rod connecting part is provided with a hole for accommodating the rotating part, and the door push rod connecting part is fixedly connected to one end of the door push rod.

[0021] According to an improvement of the present invention, the hole in the door push rod connecting portion enables the door push rod connecting portion to rotate relative to the pin shaft and the rotating portion around the Y direction without exceeding a preset angle.

[0022] According to an improvement of the utility model, the lower sliding block is provided with a guide hole, and the door driving mechanism further comprises a guide rod passing through the guide hole, and the guide rod is arranged parallel to the X direction.

[0023] From the above, it can be seen that the utility model proposes a vehicle door drive mechanism, which arranges the slider into a split structure. Through the mutual cooperation between the upper slider and the lower slider, it can not only synchronously move along the axial direction of the screw, thereby realizing the conversion of rotational motion and translational motion, but also can make the two sliders have a certain relative motion in the direction perpendicular to the screw through the rotation between the two sliders, so that the movement is smoother, avoiding deformation between the threaded connection with the screw, and reducing stress, friction and wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 A schematic diagram of a vehicle door driving mechanism according to the present utility model is shown.

[0026] Figure 2 Show Figure 1 A three-dimensional view of a slider of a door drive mechanism shown from one perspective.

[0027] Figure 3 Show Figure 1 A three-dimensional view of a slider of a door drive mechanism shown in another perspective.

[0028] Figure 4 Show Figure 1 An exploded view of the slider of the door drive mechanism is shown.

[0029] Figure 5 Show Figure 1 A three-dimensional view of an upper slider of a slider of a door drive mechanism is shown.

[0030] Figure 6 Show Figure 1 A three-dimensional view of a lower slider of a slider of a door drive mechanism is shown.

[0031] Figure 7 Show Figure 1 A sectional view of a lower slider of a slider of a door drive mechanism is shown. DETAILED DESCRIPTION

[0032] 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.

[0033] 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 various elements, and are not used to limit the nature, order or number of these elements. The terms "including" and "having" are used to express an open-ended inclusive meaning, and mean that there may be additional elements / components in addition to the listed elements / components.

[0034] The vehicle door driving mechanism of the utility model is particularly used for an electric side door. The electric side door is provided with a vehicle door driving mechanism so as to automatically open or close the vehicle door. The vehicle door is usually rotatably connected to the vehicle body through a hinge, for example, at the door frame, and is opened or closed by driving the vehicle door to change the opening angle through the vehicle door driving mechanism.

[0035] Figure 1 The schematic diagram of the door driving mechanism according to the utility model is shown. The door driving mechanism proposed by the utility model is suitable for opening and closing any electric side door. Figure 1 As shown, the door drive mechanism includes an electric motor 1, a power output device 2, a power transmission device 3, a slider 4, a door push rod 5 and a door connector 7. Specifically, the power of the electric motor 1 is output via the power output device 2, and the power output device 2 preferably adopts a combination of a worm and a helical gear pair. The helical gear is connected to the power transmission device 3, and the power transmission device 3 preferably adopts the form of a lead screw. Thus, the rotation of the electric motor 1 drives the worm to rotate, and the worm in turn drives the helical gear to rotate, and the helical gear drives the lead screw to rotate, and the lead screw drives the slider 4 connected thereto to move linearly. The interior of the slider 4 is provided with a thread that matches the thread of the lead screw. The slider 4 is connected to the door push rod 5, so that when the slider 4 moves linearly along the lead screw, the door push rod 5 also moves, thereby driving the door to move, so that the door is opened or closed. The power output device 2, the power transmission device 3, the slider 4, and the door push rod 5 can be partially accommodated in the housing. For clarity, the main part of the housing is Figure 1Not shown in the figure, only one end cover 8 of the housing is shown.

[0036] The utility model does not limit the specific structure of the driving assembly. In addition to the worm helical gear pair and the lead screw structure described above, a transmission mechanism such as a planetary gear transmission mechanism or a multi-stage fixed axis gear transmission mechanism can also be used to output the power of the motor.

[0037] like Figure 1 As shown, for the convenience of description, in the description of the utility model, the extension direction along the lead screw is defined as the "first direction", i.e., the "X direction" shown in the figure. Correspondingly, in the Cartesian coordinate system, the two directions perpendicular to the X direction are respectively referred to as the "second direction" and the "third direction", i.e., the "Y direction" perpendicular to the paper and the "Z direction" shown in the figure. When the door drive mechanism of the utility model is installed on the door, the "Z direction" is the direction perpendicular to the ground.

[0038] As an important improvement of the utility model, the slider 4 of the utility model is configured as two separate sliders, namely an upper slider 41 and a lower slider 42, and a gap is provided between the upper slider 41 and the lower slider 42. Specifically, the upper slider has an internal thread that meshes with the lead screw, and the lower slider is connected to the door push rod with a pin, and the two sliders have a tight fit interface in the X direction for transmitting driving force and preventing rotation; and the two sliders can have a certain degree of relative movement in the Y direction and the Z direction, which can effectively compensate for deformation and thermal expansion caused during the movement, thereby reducing stress, friction and wear.

[0039] The following combination Figures 2 to 7 The slider of the utility model is described in detail. Specifically, as an example, the upper slider 41 can be accommodated in the cavity formed by the lower slider 42. Figure 4 As shown, the upper slider 41 is provided with a threaded hole along the X direction so that the lead screw can pass through and be threadedly connected with the lead screw, thereby converting the rotational motion of the lead screw into the movement of the slider in the X direction. The lower slider 42 is provided with a hole for the door push rod 5 to pass through, and the lower slider 42 is also provided with a structure for installing the door push rod connecting device. Specifically, the door push rod connecting device includes three parts, one part is a pin 43 arranged along the Z direction, one part is a rotating part 45 matched with the pin 43, and the other part is a door push rod connecting part 44 matched with the rotating part 45. The pin 43 passes through the hole in the rotating part 45, and the rotating part 54 can be rotatably arranged in the hole of the door push rod connecting part 44 along the Y direction. The door push rod connecting part 44 is fixedly connected to one end of the door push rod 5. As a result, the upper slider 41 drives the lower slider 42 to move, and the lower slider 42 drives the door push rod 5 to move through the door push rod connecting device.

[0040] As a preferred embodiment of the present invention, Figure 4As shown, the hole in the door push rod connection part 44 enables the door push rod connection part 44 to rotate a certain angle relative to the pin shaft 43 and the rotating part 45. In actual movement, since the door push rod 5 has a certain length, deformation may occur during the process of transmitting power along its length direction. The arrangement of the hole enables the door push rod connection part 44 and the pin shaft 43 to rotate to a certain extent, which can compensate for the sinking of the door to a certain extent.

[0041] As a specific example, combining Figures 4 to 7 It can be seen that the upper slider 41 has four side surfaces, namely, two first side surfaces 41a perpendicular to the X direction and two second side surfaces 41b perpendicular to the Y direction. In addition, the upper slider 41 also has a bottom surface perpendicular to the Z direction. The first side surface, the second side surface and the bottom surface correspond to the corresponding side surfaces of the lower slider 42, respectively.

[0042] As a preferred embodiment, the upper slider 41 is also provided with two cylindrical surfaces perpendicular to each other at the bottom, namely a first cylindrical surface 41c along the X direction and a second cylindrical surface 41d along the Y direction, which cooperate with the corresponding structure on the lower slider 42 to be described below.

[0043] As an important improvement of the present invention, in order to solve the problem of the slider and the screw rod being inclined and generating undesirable forces in the prior art, the upper slider 41 and the lower slider 42 in the present invention can generate a rotational motion around the Y axis. Specifically, this is achieved through the first contact surface and the second contact surface. Figure 5 and Figure 6 The first contact surface and the second contact surface are described in detail.

[0044] See also Figure 5 , wherein the first contact surface 41e is shown, Figure 6 The second contact surface 42e that cooperates with the first contact surface 41e is shown in FIG. The second contact surface 42e is a plane, and the first contact surface 41e is a curved surface. In the X direction, the two first contact surfaces 41e located on both sides of the first contact surface 41e abut against the first contact surface 41e respectively, thereby limiting the movement of the first contact surface 41e along the X direction to ensure that the force in the X direction can be transmitted between the two sliders. At the same time, since the first contact surface 41e is a curved surface, the upper slider and the lower slider can rotate with each other. The first contact surface 41e can be partially formed by the cylindrical protrusion forming the second cylindrical surface 41d and the two second side surfaces 41b. The contour of the curved surface can be a complete cylindrical surface or a combination of curved surfaces with multiple curvatures, as long as it can ensure that the first contact surface can rotate relative to the second contact surface. In addition, the two first side surfaces 41a and the corresponding side surfaces of the lower slider can play a role in limiting the rotation angle.

[0045] In order to form the first contact surface 41 e , the second cylindrical surface 41 d extends beyond the two second side surfaces 41 b on both sides.

[0046] See also Figure 6 The bottom of the cavity of the lower slider is provided with two first arc surfaces 421 and second arc surfaces 422 for matching with the first cylindrical surface 41c. A hole for accommodating the pin 43 is provided between the first arc surface 421 and the second arc surface 422. Figure 7 This can be more clearly seen in the cross-sectional view shown. In actual use, the upper slider 41 is placed in the cavity of the lower slider 42. The first cylindrical surface 41c of the upper slider cooperates with the first arc surface 421 and the second arc surface 422 of the lower slider 42. Corresponding to the first contact surface 41e of the upper slider 41, two second contact surfaces 42e located on both sides of the first contact surface 41e are provided on the lower slider 42, and the first contact surface 41e with a curved outer contour contacts the second contact surface 42e, so that the lower slider 42 can generate a certain rotation around the Y direction during the movement.

[0047] Thus, during the operation of the entire mechanism, the lower slider 42 and the upper slider 41 can rotate relative to the Y axis, thereby avoiding the force problem between the upper slider 41 and the lead screw 3. Specifically, compared with the prior art in which a single slider is directly connected between the lead screw and the push rod, which may cause non-axial force between the lead screw and the slider, the utility model divides the slider into two parts and sets a gap between the two so that the two can rotate relative to each other, thereby absorbing the deflection of the push rod, thereby effectively avoiding damage to the threaded connection between the lead screw and the slider and the instability of power transmission. In addition, the gap can also effectively compensate for tolerances and thermal expansion effects.

[0048] As an improvement of the present invention, in order to make the movement more stable and smooth, the lower slider 42 is also provided with a guide hole of a certain length. Figure 2 Looking from above, it can be seen that the lower slider is provided with three holes, namely, a hole at the top for the lead screw to pass through, a hole at the middle for the door push rod to pass through, and a hole at the bottom for the guide rod 6 (see FIG. Figure 1 ) passes through the hole at the bottom. The door drive mechanism also includes a guide rod 6. The guide rod 6 is arranged substantially parallel to the lead screw, and after passing through the guide hole, its two ends are respectively mounted on the ends of the housing, so that the motion trajectory of the lower slider can be stabilized by the guide hole and the guide rod 6 to prevent the push rod from moving along its axial direction.

[0049] 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: Electric motor (1); A power output device (2), the power output device being connected to the electric motor; A power transmission device (3), the power transmission device being connected to the power output device; A slider (4), the slider being connected to the power transmission device (3); A door push rod (5), one end of which is connected to the slider and the other end of which is connected to the door; It is characterized in that The slider (4) comprises an upper slider (41) and a lower slider (42), wherein the upper slider (41) and the lower slider (42) have a first contact surface (41e) and a second contact surface (42e) that match each other in the X direction parallel to the power transmission device (3), so that the upper slider (41) and the lower slider (42) can limit the movement of the upper slider (41) and the lower slider (42) in the X direction, and allow the upper slider (41) and the lower slider (42) to rotate relative to each other in the Y direction orthogonal to the X direction, and the Z direction is orthogonal to both the X direction and the Y direction and is roughly parallel to the rotation direction of the vehicle door.

2. The door drive mechanism according to claim 1, characterized in that: The power output device (2) comprises a worm connected to the motor and a helical gear meshing with the worm.

3. The door drive mechanism according to claim 1, characterized in that: The power transmission device (3) is a lead screw.

4. The door drive mechanism according to any one of claims 1 to 3, characterized in that: The upper slider has a structure that cooperates with the power transmission device (3), so as to convert the rotational motion of the power transmission device into the linear motion of the upper slider along the X direction.

5. The vehicle door driving mechanism according to any one of claims 1 to 3, characterized in that: The first contact surface (41e) is a curved surface, the second contact surface (42e) is a flat surface, the first contact surface is formed on the upper slider (41), the second contact surface is formed on the lower slider (42), and the first contact surface (41e) contacts with a second contact surface on both sides respectively.

6. The door drive mechanism according to claim 5, characterized in that: The upper slider (41) has two first side surfaces (41a) perpendicular to the X direction, and the first side surfaces (41a) respectively cooperate with corresponding side surfaces of the lower slider (42) to limit the rotation angle between the upper slider and the lower slider.

7. The door drive mechanism according to claim 5, characterized in that: The upper slider (41) has a first cylindrical surface (41c) with the X direction as the axis, a second cylindrical surface (41d) with the Y direction as the axis, and two second side surfaces (41b) perpendicular to the Y direction. The cylinder forming the second cylindrical surface extends from both sides in the Y direction beyond the two second side surfaces (41b) to form at least a portion of the first contact surface.

8. The vehicle door driving mechanism according to any one of claims 1 to 3, characterized in that: It also includes a door push rod connection device, which includes a pin shaft (43) arranged along the Z direction, a rotating part (45) provided with a hole for accommodating the pin shaft, and a door push rod connection part (44) matched with the rotating part, the door push rod connection part (44) is provided with a hole for accommodating the rotating part, and the door push rod connection part is fixedly connected to one end of the door push rod.

9. The vehicle door driving mechanism according to claim 8, characterized in that: The hole in the door push rod connecting portion (44) enables the door push rod connecting portion to rotate relative to the pin shaft (43) and the rotating portion (45) around the Y direction within a preset angle.

10. The vehicle door driving mechanism according to any one of claims 1 to 3, characterized in that: The lower slider (42) is provided with a guide hole, and the door driving mechanism further comprises a guide rod (6) passing through the guide hole, and the guide rod (6) is arranged parallel to the X direction.

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