Orthogonal nut swing driving mechanism
By designing an orthogonal nut swing drive mechanism including motor, worm, helical gear, transmission nut and transmission bearing shell, the problems of uneven torque and stress concentration in the prior art are solved, and a more uniform stress and a more compact structure are achieved.
Patent Information
- Application Number
- CN202411866737.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-28
AI Technical Summary
The existing orthogonal nut swing drive mechanism has problems such as uneven torque, concentrated stress and poor structural compactness when transmitting the torque, which affects the stability and life of the drive mechanism.
A quadrature nut swing driving mechanism including motor, worm, helical gear, transmission nut and transmission bearing bushing is designed. The transmission points are distributed in the circumference between the helical gear and the transmission nut to achieve a relatively uniform transmission, and the limit rotation is achieved through a single transmission bearing bushing, simplifying the structure.
This design improves the wall thickness and strength of the transmission nut and helical gear, reduces structural complexity and production difficulty, and achieves a larger limit plane stress area and better swing adaptability.
Smart Images
Figure CN119711870A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of automobile automatic doors, and in particular relates to an orthogonal nut swing driving mechanism. Background Art
[0002] The orthogonal drive mechanism of automatic swing doors can be divided into an integral rotation type and a nut rotation type. The integral rotation type has a rotating bracket fixed to the door outside the drive mechanism. When the door is opened or closed, the screw is pushed out, and the drive mechanism and the rotating bracket are hinged and can rotate with each other. The installation space needs to consider avoiding most moving parts including the motor gearbox. The nut internal swing type orthogonal drive mechanism mass-produced on the market in the prior art has only two transmission pins, and the torque transmitted around the nut is uneven, which is prone to stress concentration. In addition, the small-sized gear of the nut internal swing type orthogonal drive mechanism also requires two independent bearings for easy assembly, which affects the wall thickness and strength of the nut and gear. The screw tail limit is directly subjected to force on the nut, which is easy to crush the nut, and the screw deflection makes it difficult for the tail limit plane to fit with the bearing plane when limiting. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide an orthogonal nut swing drive mechanism in view of the current status of the prior art, which can enable a large-sized limit plane to be pressed onto a bearing plane after swinging and tilting, with a larger force-bearing area and less prone to strain failure.
[0004] The technical solution adopted by the present invention to solve the above technical problems is: an orthogonal nut swing drive mechanism, including a motor, a worm, a helical gear and a screw assembly, the motor output is connected to the worm, the worm is meshed with the helical gear, and is characterized in that the drive mechanism also includes a transmission nut and a transmission bearing, the screw assembly passes through the transmission nut, and the transmission nut is respectively connected and matched with the helical gear and the transmission bearing, when the motor drives the worm to drive the helical gear to rotate, the transmission bearing enables the screw assembly and the transmission nut to achieve both telescopic and swinging movements in the door.
[0005] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the drive mechanism also includes a transmission bearing, the worm and the helical gear are orthogonally meshed and rotate at 90 degrees to each other, one end of the helical gear has a nesting portion, and the helical gear is nested into the inner ring of the transmission bearing through the nesting portion.
[0006] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the other end of the bevel gear is a half concave spherical surface and is provided with a plurality of circumferentially evenly distributed grooves, one end of the transmission bearing is provided with a plurality of circumferentially evenly distributed bosses and inserted into the grooves of the bevel gear, the middle of the transmission bearing has a half concave spherical surface with the same radius as the bevel gear, the outer surface of the transmission nut has a convex spherical surface and is wrapped and fitted by the combined concave spherical surface of the transmission bearing and the bevel gear.
[0007] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the boss of the transmission bearing is provided with a hemispherical limit portion, and the outer surface of the transmission nut is provided with arc grooves of the same number as the hemispherical limit portion, the hemispherical limit portion is engaged with the arc groove to transmit torque when the screw assembly rotates, and the screw assembly can be swung after the hemispherical limit portion is engaged with the arc groove.
[0008] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the drive mechanism also includes an end thrust bearing and a dust cover, the transmission bearing is nested and abuts against one end face of the end thrust bearing, and the other end face is tightened by the dust cover and the gear box through screws.
[0009] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the drive mechanism also includes a door mounting bracket and a gear box, the transmission bearing and the bevel gear are located in the gear box, and the outer ring of the transmission bearing is installed in the gear box and is clamped and limited by the door mounting bracket.
[0010] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, a coupling and a worm bearing are further arranged between the worm and the motor, the output shaft of the motor and the shaft of the worm are nested and connected through the coupling and can be axially moved and fine-tuned, the inner ring of the worm bearing is sleeved on the shaft of the worm, and the outer ring is fixed to the inside of the gear box and causes the worm to rotate.
[0011] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the screw assembly includes a screw and an arc-shaped guide block, a limit block, and a self-locking nut fixed at one end of the screw, the external thread of the screw is engaged with the internal thread of the transmission nut, the rear end face of the arc-shaped guide block is a convex arc and fits with the middle curved surface of the front end face of the limit block, the edge circle of the front end face is a plane, and the rear end face of the limit block is a convex arc and fits with the inner concave surface of the self-locking nut.
[0012] Here, one end of the limit at the tail of the screw rod is a concave spherical surface, which fits with the convex spherical joint bearing, and the other end is a convex spherical surface that fits with the end face of the concave spherical self-locking nut. When the limit block hits the end face of the bearing under force, the center can slide around the spherical surface to adapt to various swing angles of different car doors until the front end surface of the limit block plane fits the end face thrust bearing.
[0013] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, the other end of the screw rod is provided with a body bracket, a pin shaft and a joint bearing, the pin shaft is connected in series with the connecting hole of the body bracket and the joint bearing, and the joint bearing is installed in the ball hole of the screw rod head.
[0014] Preferably, in the above-mentioned orthogonal nut swing drive mechanism, a bellows is arranged outside the screw rod, and the bellows is sleeved on the front end of the screw rod and clamped between the door mounting bracket and the gear box.
[0015] Compared with the prior art, the advantages of the present invention are that the transmission points between the bevel gear and the transmission nut are evenly distributed on the circumference, the force is more uniform, and no two independent bearings and transmission pins are required between the bevel gear and the transmission nut, which is conducive to production and processing, and the structure is more compact. Only one transmission bearing is needed to realize transmission and limit the rotation of the nut at the same time, without affecting the wall thickness and strength of the transmission nut and the bevel gear. The tail limit of the screw rod has a movable joint, which can adapt to various swing angles of different car doors. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the overall structure of the orthogonal nut swing drive mechanism;
[0017] Figure 2 This is a schematic diagram of the internal structure of the orthogonal nut swing drive mechanism;
[0018] Figure 3 This is a schematic diagram of the exploded structure of the helical gear, transmission nut, etc. of the orthogonal nut swing drive mechanism;
[0019] Figure 4 It is a schematic diagram of the internal cross-sectional structure of the orthogonal nut swing drive mechanism. DETAILED DESCRIPTION
[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0021] In the figure, the motor 100; the worm 200; the bevel gear 300; the nesting part 301; the groove 302; the door mounting bracket 400; the gear box 500; the transmission bearing 600; the screw 700; the coupling 800; the worm bearing 900; the transmission nut 1000; the arc groove 1001; the transmission bearing 1001; the boss 10011; the hemispherical limit part 10012; the end thrust bearing 1002; the dust cover 1003; the arc guide block 1004; the limit block 1005; the self-locking nut 1006; the fuselage bracket 1007; the pin 1008; the spherical bearing 1009; and the bellows 1010.
[0022] like Figure 1 and Figure 2As shown, the orthogonal nut swing drive mechanism includes a motor 100, a worm 200, a bevel gear 300, a door mounting bracket 400, a gear box 500, a transmission bearing 600 and a screw assembly, the screw assembly includes a screw 700, a coupling 800 and a worm bearing 900 are also provided between the worm 200 and the motor 100, the output shaft of the motor 100 and the shaft of the worm 200 are nested and connected through the coupling 800 and can be axially moved and fine-tuned, and the inner ring of the worm bearing 900 On the shaft of the worm 200, the outer ring is fixed to the inside of the gear box 500 and causes the worm 200 to rotate, so that the axial movement can be fine-tuned. In addition, the worm 200 is meshed with the bevel gear 300. The worm 200 and the bevel gear 300 are orthogonally meshed and rotate at 90 degrees to each other. One end of the bevel gear 300 has a nesting portion 301, and the bevel gear 300 is nested in the inner ring of the transmission bearing 600 through the nesting portion 301, so that power can be transmitted from the worm 200 to the bevel gear 300.
[0023] like Figure 3 as well as Figure 4 As shown, the driving mechanism of the present patent also includes a transmission nut 1000 and a transmission bearing 1001. The screw assembly passes through the transmission nut 1000, and the transmission nut 1000 is respectively connected and cooperated with the bevel gear 300 and the transmission bearing 1001. When the motor 100 drives the worm 200 to drive the bevel gear 300 to rotate, the transmission bearing 1001 enables the screw assembly and the transmission nut 1000 to realize both telescopic and swinging movements in the door. The telescopic movement of the screw assembly can realize the opening of the door, and the swinging can realize a certain angle adjustment, thereby ensuring the reliability of the entire driving mechanism.
[0024] As a priority, the other end of the bevel gear 300 in this patent is a half concave spherical surface and is provided with a plurality of grooves 302 evenly distributed around the circumference. One end of the transmission bearing 1001 is provided with a plurality of bosses 10011 evenly distributed around the circumference and inserted into the groove 302 of the bevel gear 300. The middle of the transmission bearing 1001 has a half concave spherical surface with the same radius as the bevel gear 300. The outer surface of the transmission nut 1000 has a convex spherical surface and is wrapped and fitted by the combined concave spherical surface of the transmission bearing 1001 and the bevel gear 300. In addition, the boss 10011 of the transmission bearing 1001 has a semi-spherical limit portion 10012, and the outer surface of the transmission nut 1000 The surface is provided with the same number of arc grooves 1001 as the hemispherical limiting parts 10012. Here, the hemispherical limiting parts 10012 cooperate with the arc grooves 1001 to transmit torque through line contact. When the transmission nut 1000 rotates with the screw 700, the transmission bearing 1001 can be fixed, and the hemispherical limiting parts 10012 of the transmission bearing 1001 do not affect the flexible rotation of the arc groove 1001 of the transmission nut 1000 around its sphere center. In addition, the hemispherical limiting parts 10012 are inserted into the arc groove 1001 to transmit torque when the screw assembly rotates, and the swing of the screw assembly is realized after the hemispherical limiting parts 10012 are inserted into the arc groove 1001.
[0025] In order to protect the core components and prevent impurities from entering the interior, the drive mechanism also includes an end thrust bearing 1002 and a dust cover 1003. The transmission bearing 1001 is nested and against one end face of the end thrust bearing 1002, and the other end face is tightened by the dust cover 1003 and the gear box 500 through screws. The transmission bearing 600 and the bevel gear 300 are located in the gear box 500. The outer ring of the transmission bearing 600 is installed in the gear box 500 and is pressed and limited by the door mounting bracket 400. Here, the screw assembly also includes an arc-shaped guide block 1004, a limit block 1005, and a self-locking nut 1006 fixed to one end of the screw 700. The external thread of the screw 700 It is meshed with the internal thread of the transmission nut 1000, and the rear end face of the arc-shaped guide block 1004 is a convex arc and fits with the middle curved surface of the front end face of the limit block 1005, and the edge circle of the front end face is a plane. The rear end face of the limit block 1005 is a convex arc and fits with the inner concave surface of the self-locking nut 1006. Here, one end of the limit at the tail of the screw rod 700 is a concave spherical surface, which fits with the convex spherical joint bearing 1009, and the other end is a convex spherical surface that fits with the end face of the concave spherical self-locking nut 1006. When the limit block 1005 hits the end face of the bearing and is subjected to force, the center can slide around the spherical surface to adapt to various swing angles of different car doors until the front end face circle of the limit block 1005 plane fits with the end thrust bearing 1002.
[0026] The other end of the screw rod 700 is provided with a body bracket 1007, a pin shaft 1008 and a joint bearing 1009. The pin shaft 1008 is connected in series with the connecting hole of the body bracket 1007 and the joint bearing 1009. The joint bearing 1009 is installed in the ball hole of the head of the screw rod 700. A bellows 1010 is provided on the outside of the screw rod 700. The bellows 1010 is sleeved on the front end of the screw rod 700 and is stuck between the door mounting bracket 400 and the gear box 500. The bellows 1010 can be used to adjust the screw rod 70 0 for protection, the transmission points between the bevel gear 300 and the transmission nut 1000 are evenly distributed on the circumference, the force is relatively uniform, no two independent bearings and transmission pins are required between the bevel gear and the transmission nut 1000, which is conducive to production and processing, and the structure is more compact. Only one transmission bearing 1001 is needed to realize transmission and limit the rotation of the nut at the same time, without affecting the wall thickness and strength of the transmission nut 1000 and the bevel gear 300. The tail limit of the screw rod 700 has a movable joint, which can adapt to various swing angles of different doors.
[0027] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0028] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. An orthogonal nut swing drive mechanism, comprising a motor, a worm, a helical gear and a screw assembly, wherein the motor output is connected to the worm, and the worm is meshed with the helical gear, characterized in that: The driving mechanism also includes a transmission nut and a transmission bearing. The screw assembly passes through the transmission nut, and the transmission nut is respectively connected and cooperated with the bevel gear and the transmission bearing. When the motor drives the worm to drive the bevel gear to rotate, the screw assembly and the transmission nut rely on the action of the transmission bearing to achieve both telescopic and swinging movements in the door.
2. An orthogonal nut swing drive mechanism according to claim 1, characterized in that: The driving mechanism also includes a transmission bearing. The worm and the helical gear are orthogonally meshed and rotate at 90 degrees with each other. One end of the helical gear has a nesting portion, and the helical gear is nested in the inner ring of the transmission bearing through the nesting portion.
3. An orthogonal nut swing drive mechanism according to claim 1 or 2, characterized in that: The other end of the helical gear is a half concave spherical surface and is provided with a plurality of grooves evenly distributed around the circumference. One end of the transmission bearing is provided with a plurality of bosses evenly distributed around the circumference and inserted into the groove of the helical gear. The middle of the transmission bearing has a half concave spherical surface with the same radius as the helical gear. The outer surface of the transmission nut has a convex spherical surface and is wrapped and fitted by the combined concave spherical surface of the transmission bearing and the helical gear.
4. The orthogonal nut swing drive mechanism according to claim 1, characterized in that: The boss of the transmission bearing is provided with a hemispherical limit portion, and the outer surface of the transmission nut is provided with arc grooves of the same number as the hemispherical limit portion. The hemispherical limit portion is engaged with the arc groove to transmit torque when the screw assembly rotates, and the screw assembly can swing after the hemispherical limit portion is engaged with the arc groove.
5. The orthogonal nut swing drive mechanism according to claim 1, characterized in that: The driving mechanism also includes an end thrust bearing and a dust cover. The transmission bearing bush is nested and abuts against one end face of the end thrust bearing, and the other end face is tightened by the dust cover and the gear box through screws.
6. The orthogonal nut swing drive mechanism according to claim 1, characterized in that: The driving mechanism also includes a door mounting bracket and a gear box. The transmission bearing and the bevel gear are located in the gear box. The outer ring of the transmission bearing is installed in the gear box and is pressed and limited by the door mounting bracket.
7. The orthogonal nut swing drive mechanism according to claim 1, characterized in that: A coupling and a worm bearing are also provided between the worm and the motor. The output shaft of the motor and the shaft of the worm are nested and connected through the coupling and can be axially moved and fine-tuned. The inner ring of the worm bearing is sleeved on the shaft of the worm, and the outer ring is fixed to the inside of the gear box and enables the worm to rotate.
8. The orthogonal nut swing drive mechanism according to claim 1, characterized in that: The screw assembly includes a screw and an arc-shaped guide block, a limit block, and a self-locking nut fixed at one end of the screw. The external thread of the screw is meshed with the internal thread of the transmission nut. The rear end face of the arc-shaped guide block is a convex arc and fits with the middle curved surface of the front end face of the limit block. The edge circle of the front end face is a plane. The rear end face of the limit block is a convex arc and fits with the inner concave surface of the self-locking nut.
9. An orthogonal nut swing drive mechanism according to claim 8, characterized in that: The other end of the screw rod is provided with a body bracket, a pin shaft and a joint bearing. The pin shaft is connected in series with the connecting hole of the body bracket and the joint bearing, and the joint bearing is installed in the ball hole of the screw rod head.
10. The orthogonal nut swing drive mechanism according to claim 8, characterized in that: A bellows is arranged outside the screw rod, and the bellows is sleeved on the front end of the screw rod and is clamped between the door mounting bracket and the gear box.