Automatic door opening and closing mechanism

Abstract

The present invention provides an automatic door opening and closing mechanism, comprising: a drive assembly, the drive assembly including a motor, a driving gear mounted on the output shaft of the motor; a transmission assembly, the transmission assembly including a driven gear, a mounting bracket, a ball bearing, a retaining bracket, a ball nut, a screw, and a bearing, the screw having a starting end hingedly connected to a body mounting bracket on the vehicle body, a ball nut threadedly connected to the screw, the ball nut having an inner raceway, the ball nut externally connected to a mounting bracket, the mounting bracket having an outer raceway, the ball bearing movably connected to a retaining bracket, the retaining bracket connected between the inner raceway and the outer raceway, the driven gear fixedly mounted on the mounting bracket, the driven gear meshing with the driving gear; a limit assembly fixedly connected to the end of the screw; and a mounting assembly for mounting the opening and closing mechanism in the vehicle door, the mounting assembly being connected to a sealing structure. The opening and closing mechanism is suitable for high-power transmission applications, requires a small Z-axis height difference between the vehicle door and the vehicle body, and is smoother when the vehicle door opens and closes.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and in particular to an automatic opening and closing mechanism for a vehicle door. Background Art

[0002] Car doors can be opened in a variety of ways. Depending on the source of the power, they can be categorized as manual or automatic. Automatic doors enhance entry and exit convenience and improve vehicle quality.

[0003] However, the existing automatic door opening and closing mechanism mainly relies on "ball joints", "rotating shafts", "connecting rods" and other mechanisms to achieve swinging, and there are still the following shortcomings in the application process: ① The ball joint is not suitable for high-power transmission, and the efficiency of automatic opening and closing of heavier doors is low, the door opening time is long, and the experience is poor; ② The automatic opening and closing mechanism of the rotating shaft and connecting rod requires that the Z-direction drop between the door and the body installation point be as small as possible, with high precision requirements and poor versatility. When the door sags, it will cause difficulty in opening and closing and abnormal noise. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides an automatic door opening and closing mechanism, which is suitable for high-power transmission applications, has low requirements for the Z-direction height difference between the door and the vehicle body, and is smoother when the door is opened and closed.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: an automatic door opening and closing mechanism, comprising:

[0006] A drive assembly, the drive assembly comprising a motor, an output shaft of the motor being provided with a driving gear;

[0007] A transmission assembly, which is in transmission connection with the driving assembly, and includes a first housing, a driven gear, a mounting frame, a retaining frame, a ball nut, a screw and a plurality of ball bearings. The starting end of the screw is hinged to the body mounting bracket on the vehicle body, the ball nut is threadedly connected to the screw, the ball nut has a plurality of inner raceways, a mounting frame is connected to the outside of the ball nut, the mounting frame has a plurality of outer raceways, and the plurality of ball bearings are respectively connected between the inner raceways of the ball nut and the outer raceways of the mounting frame, and the ball bearings are connected to each other via a retaining frame. The driven gear is fixedly mounted on the mounting frame, the driven gear is meshed with the driving gear, and the mounting frame is rotatably connected to the first housing via a bearing;

[0008] a limiting assembly, wherein the limiting assembly is fixedly connected to the end of the screw rod;

[0009] The invention also comprises a mounting assembly for mounting the opening and closing mechanism in a vehicle door, wherein the mounting assembly is connected with a sealing structure.

[0010] Furthermore, the first housing is fixedly connected to the second housing via a second mounting bolt, the second housing is fixedly connected to the vehicle door via a first mounting bolt, and the first housing is connected to the connecting bracket on the motor via a third mounting bolt.

[0011] Furthermore, the sealing structure includes a first sealing ring, a second sealing ring, a first dust cover and a second dust cover. The first sealing ring is arranged between the first shell and the second shell to achieve direct sealing between the first shell and the second shell. The second sealing ring is arranged between the first shell and the motor to achieve sealing between the first shell and the motor. The first dust cover is arranged on the first shell to achieve dust protection for the screw rod in the first shell. The second dust cover is arranged on the second shell.

[0012] Furthermore, the outer raceway of the mounting frame is not concentric with the inner raceway of the ball nut and is distributed on both sides of the ball center of the retaining frame.

[0013] Furthermore, the outer raceway on the mounting frame is distributed on the inner wall of the mounting frame, the inner raceway on the ball nut is distributed on the outer wall of the ball nut, and the balls are fixed in a plane by a retaining frame.

[0014] Furthermore, a ball head is fixed to the starting end of the screw rod, and the ball head is locked by a ball head locking nut. A screw rod rotating shaft passes through the body mounting bracket, the ball head and the ball head locking nut in sequence, and the screw rod rotating shaft is fixedly connected to the body mounting bracket.

[0015] Furthermore, the limit assembly consists of a limit stop, a mounting nut, and a limit nut. The limit stop is arranged at the end of the screw rod and is limited by the mounting nut and the limit nut. The left and right sides of the limit stop respectively have a first spherical surface and a second spherical surface, and are hinged to the spherical surface of the mounting nut through the first spherical surface, and the second spherical surface is hinged to the spherical surface of the limit nut.

[0016] Furthermore, the inner and outer sides of the ball head have limiting planes, the end of the screw rod is a connector with an inner hole, the inner and outer sides of the inner hole have matching planes that match the limiting planes, the spherical surface of the ball head and the spherical surface of the inner hole of the connector are spherically matched, and the ball head is also spherically matched with the ball head locking nut, and the limiting plane of the ball head and the matching plane of the inner hole of the connector are in contact and connected.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the opening and closing mechanism is suitable for high-power transmission occasions, and does not require a high Z-direction drop between the door and the body. The door is smoother when opening and closing, has good speed synchronization, high transmission efficiency, shortens the opening and closing time, and is suitable for heavier doors; it also has good sealing and sound insulation and noise reduction.

[0019] Second, the opening and closing mechanism is suitable for larger axis angles and has high versatility. It can be installed even if there is a large gap between the door and the body. The mechanism components are simple and compact. The limit components are reliable during automatic opening and closing.

[0020] Third, through the action of the limit assembly, the limit stop is spherically hinged with the mounting nut and the limit nut. The limit stop can rotate around the spherical surface to achieve surface-to-surface contact, play a limiting role, ensure the limit reliability, and prevent the car door from opening too much. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the automatic door opening and closing mechanism of the present invention.

[0022] Figure 2 Schematic diagram of the internal components of the automatic door opening and closing mechanism of the present invention.

[0023] Figure 3 for Figure 2 Schematic diagram of the ball joint synchronous universal structure of the automatic door opening and closing mechanism.

[0024] Figure 4 for Figure 3 Schematic diagram of the swing of the ball cage synchronous universal structure.

[0025] Figure 5 This is a cross-sectional view of the limiting component of the automatic door opening and closing mechanism of the present invention.

[0026] Figure 6 This is a schematic diagram of the connection between the automatic door opening and closing mechanism and the door body of the present invention.

[0027] Figure 7 for Figure 1 A longitudinal sectional view of the automatic door opening and closing mechanism shown.

[0028] Figure 8 for Figure 1 A cross-sectional view of the automatic door opening and closing mechanism shown.

[0029] Figure 9 This is a cross-sectional view showing the connection between the body mounting bracket and the screw rod in view A.

[0030] Figure 10 This is a longitudinal section view showing the connection between the body mounting bracket and the screw rod in view A.

[0031] Figure 11 This is a shaft view showing the connection between the body mounting bracket and the screw in view A.

[0032] Figure 12 This is a structural diagram of the present invention connected to the vehicle door and the vehicle body (the vehicle door is opened at a small angle);

[0033] Figure 13This is a structural diagram of the present invention connected to the vehicle door and the vehicle body (the vehicle door is opened at a large angle);

[0034] In the figure: 1. Motor; 2. Car body mounting bracket; 3. First dust cover; 4. First housing; 5. Second housing; 6. Second dust cover; 7. Control unit; 8. Output shaft; 9. Driving gear; 10. Driven gear; 11. Mounting bracket; 12. Screw; 13. Bearing; 14. Stopper; 15. Mounting nut; 16. Ball; 17. Retaining rack; 18. Ball nut; 19. Car body; 20. Door; 21. Second sealing ring; 22. First sealing ring; 23. First mounting bolt; 24. Second mounting bolt; 25. Third mounting bolt; 26. Door hinge axis; 27. Screw rotation axis; 28. Ball nut rotation axis; 29. ​​Stop nut; 30. Screw rotation axis; 31. Ball head; 32. Ball head locking nut; 33. Stop plane; 34. Matching plane; 35. Connector DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0036] like Figures 1-13 The automatic door opening and closing mechanism shown includes:

[0037] A drive assembly, comprising a motor 1, with a driving gear 9 mounted on an output shaft 8 of the motor 1;

[0038] A transmission assembly, which is in transmission connection with the drive assembly, comprises a first housing 4, a driven gear 10, a mounting frame 11, a retaining frame 17, a ball nut 18, a screw 12 and a plurality of balls 16. The starting end of the screw 12 is hinged to the body mounting bracket 2 on the body 19. The ball nut 18 is threadedly connected to the screw 12. The ball nut 18 has a plurality of inner raceways. A mounting frame 11 is connected to the outside of the ball nut 18. The mounting frame 11 has a plurality of outer raceways. A plurality of balls 16 are respectively connected between the inner raceways of the ball nut 18 and the outer raceways of the mounting frame 11. The balls 16 are connected by a retaining frame 17. The driven gear 10 is fixedly mounted on the mounting frame 11. The driven gear 10 is meshed with the driving gear 9. The mounting frame 11 is rotatably connected to the first housing 4 via a bearing 13.

[0039] a limiting assembly, the limiting assembly being fixedly connected to the end of the screw rod 12;

[0040] The vehicle door 20 further comprises a mounting assembly for mounting the opening and closing mechanism on the vehicle door 20 , wherein the mounting assembly is connected to a sealing structure.

[0041] The process of the present invention when in use is as follows: the automatic opening and closing mechanism of the vehicle door 20 is installed on the vehicle door 20 through the mounting assembly during installation, wherein the end of the screw rod 12 thereon is hinged to the body mounting bracket 2 on the vehicle body 19. When the vehicle door 20 needs to be opened, the driving assembly is directly started through the vehicle control unit 7, and the motor 1 of the driving assembly starts to rotate and drives the driving gear 9 thereon to rotate. Since the driving gear 9 and the driven gear 10 are engaged, the driven gear 10 can be driven to rotate, and the driven gear 10 will continue to drive the mounting frame 11 to rotate. When the mounting frame 11 rotates, the retaining frame 17 is driven to rotate through the ball bearings, and the balls 16 connected to the retaining frame 17 will drive the ball nut 18 rotates. Since the ball nut 18 and the screw rod 12 are threadedly connected, the axial rotation of the ball nut 18 can drive the axial telescopic movement of the screw rod 12, thereby converting the rotational force into a linear thrust. The axial telescopic movement of the screw rod 12 drives the car door 20 to realize the opening and closing functions of the car door 20. Since the starting end of the screw rod 12 is hinged to the mounting bracket 2 of the vehicle body 19, the starting end of the screw rod 12 will rotate relative to the mounting bracket 2 of the vehicle body 19 while the screw rod 12 is extending and retracting. In addition, since the ball nut 18 has an inner raceway and the mounting bracket 11 has an outer raceway, the ball 16 can roll between the inner raceway and the outer raceway, and the ball nut 18 can be rotated in the mounting bracket 11, thereby realizing the swing of the screw rod 12. Figure 10 and Figure 11 As shown, under the simultaneous action of the screw rod 12 swinging, the screw rod 12 extending and retracting, and the screw rod 12 rotating around the vehicle body 19 mounting bracket 2, the door 20 can be swung, thereby realizing the opening and closing of the door 20.

[0042] In the process of pushing the car door 20, the car door 20 rotates around the car door hinge axis 26, and the screw also rotates around the screw rotation axis 27. During the rotation of the screw 12, the shaft angle α with the mounting assembly changes, and the swing is achieved through the ball nut 18, the mounting bracket, the retaining frame 17 and the ball 16. Constant speed transmission can also be achieved when the shaft angle increases.

[0043] In addition, the driving gear 9 and the driven gear 10 of the transmission assembly can be matched with ordinary spur gears, bevel gears, worm helical gears, or worm and worm gears, and the above combinations can achieve the same effect.

[0044] Furthermore, the first housing 4 is fixedly connected to the second housing 5 via a second mounting bolt 24, the second housing 5 is fixedly connected to the vehicle door 20 via a first mounting bolt 23, and the first housing 4 is connected to a connecting bracket on the motor 1 via a third mounting bolt 25. Specifically, the mounting assembly of the present invention includes a first housing 4 having the second housing 5 fixedly mounted on its side. In addition, in order to secure the motor 1, the first housing 4 is secured to a connecting bracket on the motor 1 via a third mounting bolt 25.

[0045] Furthermore, the sealing structure includes a first sealing ring 22, a second sealing ring 21, a first dust cover 3, and a second dust cover 6. The first sealing ring 22 is disposed between the first housing 4 and the second housing 5 to achieve direct sealing between the first housing 4 and the second housing 5. The second sealing ring 21 is disposed between the first housing 4 and the motor 1 to achieve sealing between the first housing 4 and the motor 1. The first dust cover 3 is disposed on the first housing 4 to protect the screw rod 12 in the first housing 4 from dust. The second dust cover 6 is disposed on the second housing 5. Because the operating environment of the vehicle door 20 is complex, such as operating in a humid or dusty environment, or encountering water ingress into the vehicle door 20, in order to enhance the waterproof and dustproof properties of the opening and closing mechanism, a sealing structure is also included in the mounting assembly. The first sealing ring 22 directly seals the first housing 4 and the second housing 5, the second sealing ring 21 seals the first housing 4 and the motor 1, and the first dust cover 3 and the second dust cover 6 protect the screw rod 12 from dust.

[0046] Furthermore, the outer raceway of the mounting frame 11 is not concentric with the inner raceway of the ball nut 18, and the centers of the circles are symmetrically distributed on both sides of the center of the retaining frame 17. Figure 4 As shown, the starting end of the radius R3 is the center of the retaining frame, the starting end of the radius R1 is the center of the inner raceway of the ball nut, and the starting end of the radius R2 is the center of the outer raceway of the mounting frame. When the axial angle between the mounting frame 11 and the ball nut 18 in the present invention is 0°, the retaining frame 17 and the inner and outer raceways can fix the ball 16 in the correct position; when the axial angle is greater than 0°, the ball 16 can be fixed in the correct position only by the intersection of the raceways on the mounting frame 11 and the ball nut 18. Therefore, regardless of the rotation direction, multiple balls 16 can transmit torque, and constant speed transmission can be achieved.

[0047] Furthermore, the outer raceway of the mounting frame 11 is located on the inner wall of the mounting frame 11, and the inner raceway of the ball nut 18 is located on the outer wall of the ball nut 18. The balls 16 are secured in a plane by a retainer 17. Specifically, the multiple raceways distributed within the mounting frame 11 and ball nut 18, along with the multiple balls 16, ensure that the torque generated during rotation is more evenly distributed across the balls 16, thereby extending the life of the balls 16. Even better, the outer and inner raceways are evenly distributed across the mounting frame and ball nut.

[0048] Furthermore, a ball head is fixed to the starting end of the screw rod 12, and the ball head is locked by a ball head locking nut 32. The rotating shaft of the screw rod 12 passes through the mounting bracket 2 of the vehicle body 19, the ball head, and the ball head locking nut 32 in sequence, and the rotating shaft of the screw rod 12 is fixedly connected to the mounting bracket 2 of the vehicle body 19. Specifically, a ball head is fixed to the starting end of the screw rod 12, and the ball head is locked by a ball head locking nut. After locking, the ball head cooperates with the upper and lower spherical surfaces of the screw rod 12, and the ball head can rotate up and down. Under the action of gravity, the car door will sag to a certain extent. In this way, even if there is a height difference between the car door 20 and the vehicle body 19 in the Z direction, it can still rotate smoothly.

[0049] Furthermore, the limit assembly is composed of a limit stop 14, a mounting nut 15, and a limit nut 29. The limit stop 14 is provided at the end of the screw rod 12 and is limited by the mounting nut 15 and the limit nut 29. The left and right sides of the limit stop 14 respectively have a first spherical surface and a second spherical surface, and are spherically hinged to the mounting nut 15 through the first spherical surface, and spherically hinged to the limit nut 29 through the second spherical surface. Specifically, the limit stop 14 is spherically hinged to the mounting nut 15, and the limit stop 14 is spherically hinged to the limit nut 29, and the limit stop 14 can rotate around the spherical surface. Figure 5 As shown, when the automatic opening and closing mechanism of the car door 20 moves to the extreme end, the limit stop 14 is spherically hinged with the mounting nut 15 and the limit nut 29, and the right side plane of the limit stop 14 abuts against the first shell 4. The limit stop 14 is limited, and when the screw rod 12 swings, the mounting nut 15 rotates around the spherical surface of the limit stop 14 to achieve surface-to-surface contact. Since the two ends of the limit stop 14 have limit flanges, it can play a limiting role, ensure the reliability of the limit, and prevent the car door 20 from being over-opened.

[0050] Furthermore, the ball head has limiting planes 33 on its inner and outer sides. The end of the screw rod is a connector 35 having an inner hole. The inner and outer sides of the inner hole have matching planes 34 that match the limiting planes. The spherical surface of the ball head and the spherical surface of the inner hole of the connector 35 are spherically matched. The ball head 31 also spherically matches the ball head locking nut 32. The limiting plane 33 of the ball head is in contact with the matching plane 34 of the inner hole of the connector 35. With the above structure, since the matching plane 34 of the connector 35 is in contact with the limiting plane 33 on the ball head, the two cannot rotate relative to each other, thereby achieving lateral limitation of the ball head and the screw rod 12, so that it will not deviate in the lateral direction.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An automatic door opening and closing mechanism, characterized in that: include: A drive assembly, the drive assembly comprising a motor, an output shaft of the motor being provided with a driving gear; A transmission assembly, which is in transmission connection with the driving assembly, and includes a first housing, a driven gear, a mounting frame, a retaining frame, a ball nut, a screw and a plurality of ball bearings. The starting end of the screw is hinged to the body mounting bracket on the vehicle body, the ball nut is threadedly connected to the screw, the ball nut has a plurality of inner raceways, a mounting frame is connected to the outside of the ball nut, the mounting frame has a plurality of outer raceways, and the plurality of ball bearings are respectively connected between the inner raceways of the ball nut and the outer raceways of the mounting frame, and the ball bearings are connected to each other via a retaining frame. The driven gear is fixedly mounted on the mounting frame, the driven gear is meshed with the driving gear, and the mounting frame is rotatably connected to the first housing via a bearing; a limiting assembly, wherein the limiting assembly is fixedly connected to the end of the screw rod; Also included is a mounting assembly for mounting the opening and closing mechanism in a vehicle door, wherein the mounting assembly is connected to a sealing structure; The outer raceway of the mounting frame is not concentric with the inner raceway of the ball nut, and is distributed on both sides of the ball center of the retaining frame. The outer raceway on the mounting frame is distributed on the inner wall of the mounting frame, and the inner raceway on the ball nut is distributed on the outer wall of the ball nut. The ball is fixed to a plane through the retaining frame, and the outer raceway and inner raceway are evenly distributed on the mounting frame and the ball nut.

2. The automatic door opening and closing mechanism according to claim 1, characterized in that: The first housing is fixedly connected to the second housing via a second mounting bolt, the second housing is fixedly connected to the vehicle door via a first mounting bolt, and the first housing is connected to a connecting bracket on the motor via a third mounting bolt.

3. The automatic door opening and closing mechanism according to claim 2, characterized in that: The sealing structure includes a first sealing ring, a second sealing ring, a first dust cover and a second dust cover. The first sealing ring is arranged between the first shell and the second shell to achieve direct sealing between the first shell and the second shell. The second sealing ring is arranged between the first shell and the motor to achieve sealing between the first shell and the motor. The first dust cover is arranged on the first shell to achieve dust protection for the screw rod in the first shell. The second dust cover is arranged on the second shell.

4. The automatic door opening and closing mechanism according to claim 3, characterized in that: A ball head is fixed to the starting end of the screw rod, and the ball head is locked by a ball head locking nut. A screw rod rotating shaft passes through the vehicle body mounting bracket, the ball head and the ball head locking nut in sequence, and the screw rod rotating shaft is fixedly connected to the vehicle body mounting bracket.

5. The automatic door opening and closing mechanism according to claim 4, characterized in that: The limit assembly consists of a limit stop, a mounting nut, and a limit nut. The limit stop is arranged at the end of the screw rod and is limited by the mounting nut and the limit nut. The left and right sides of the limit stop have a first spherical surface and a second spherical surface, respectively, and are hinged to the spherical surface of the mounting nut through the first spherical surface, and the second spherical surface is hinged to the spherical surface of the limit nut.

6. The automatic door opening and closing mechanism according to claim 5, characterized in that: The inner and outer sides of the ball head have limiting planes, the end of the screw rod is a connector with an inner hole, the inner and outer sides of the inner hole have matching planes that match the limiting planes, the spherical surface of the ball head and the spherical surface of the inner hole of the connector are spherically matched, and the ball head is also spherically matched with the ball head locking nut, and the limiting plane of the ball head and the matching plane of the inner hole of the connector are in contact and connected.

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