Single-motor worm gear driving lifting mechanism and electronic gear shifter

Abstract

The utility model relates to the technical field of automobile gear shifting, and particularly discloses a single-motor worm gear driving lifting mechanism and an electronic gear shifter. The lifting mechanism comprises a driving motor, a worm, a worm gear composite part, a lead screw and a nut sleeve. An output shaft of the driving motor is fixedly connected with a worm; the worm gear composite part is meshed with the worm and drives the screw rod to rotate; circumferential rotation of the side wall of the nut sleeve is limited through a guide structure, and a handball is mounted at the top of the nut sleeve; according to the utility model, worm gear transmission is adopted to replace traditional synchronous belt transmission, and the self-locking performance of worm gear and worm meshing is utilized to improve the power-off position holding capability; the worm gear composite part and the transmission gear are in interference press fitting; the two ends of the lead screw are axially locked through the double clamp springs, transmission rigidity is ensured, and the production and assembly procedures are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic shifters, in particular to a single-motor worm gear driven lifting mechanism and an electronic shifter. Background Art

[0002] In the design of the lifting mechanism for electronic shifters, the synchronous belt drive, long the mainstream solution, suffers from inherent flaws. Insufficient transmission rigidity: elastic deformation of the synchronous belt leads to deviations in the repeatability of the lifting position, making it difficult to meet the positioning requirements of high-end vehicles. Weak vibration resistance: low-frequency vibrations generated by vehicle movement can easily cause transmission slippage, resulting in unexpected displacement of the handball. This issue necessitates optimization of the handball's lifting structure. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a single-motor worm gear driven lifting mechanism and an electronic shifter.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a single-motor worm gear driven lifting mechanism, comprising a driving motor, a worm gear complex, a worm, a lead screw and a nut sleeve; the output shaft of the driving motor is connected to the worm; the worm gear complex is meshed with the worm for transmission; the lead screw is driven to rotate by the worm gear complex; the nut sleeve is threadedly engaged with the lead screw, and a guide structure for limiting circumferential rotation is provided on one side of the nut sleeve; the nut sleeve is used to install a handball; and further comprises: a PCB board, provided on one side of the lead screw; two micro switches, respectively provided at both ends of the length direction of the PCB board, for detecting the lifting and lowering limit positions of the nut sleeve.

[0005] As a preferred technical solution of the present invention, the worm gear composite component includes a coaxially arranged worm wheel portion and a gear portion; the worm wheel portion is engaged with the worm; and the lower part of the screw rod is provided with a transmission gear engaged with the gear portion.

[0006] As a preferred technical solution of the present invention, the worm wheel portion and the gear portion are integrally formed, and the worm wheel portion is located above the gear portion.

[0007] As a preferred technical solution of the present invention, it also includes a mounting base, and the worm gear composite component and the screw are rotatably arranged on the mounting base.

[0008] As a preferred technical solution of the present invention, a through hole is provided at the center of the worm gear composite component, and a positioning shaft is provided on the mounting base that penetrates into the through hole.

[0009] As an optimal technical solution of the present invention, a connecting shaft is provided at the lower part of the screw rod, and a limiting step is provided on the outer wall of the connecting shaft, and the limiting step divides the connecting shaft into a mating shaft portion and an installation shaft portion; the transmission gear is sleeved on the installation shaft portion, and the lower end abuts the limiting step; the outer sleeve of the mating shaft portion is provided with a bearing and a first retaining spring for fixing the bearing on the mating shaft portion, and the installation base is provided with a positioning hole for embedding the bearing.

[0010] As an optimal technical solution of the present invention, a polished rod portion is provided on the upper part of the screw rod, and a step surface is formed at the connection between the polished rod portion and the screw threaded portion; the polished rod portion is sleeved with a retaining ring abutting the step surface; and a second retaining spring is provided at the end of the polished rod portion for axially constraining the retaining ring.

[0011] As an optimal technical solution of the present invention, it also includes: an outer shell, fixed to the mounting base; a guide plate, symmetrically fixed to the inner wall of the outer shell, and a longitudinally extending guide groove is provided on the inner side thereof; slide plates are provided on both sides of the nut sleeve, and the slide plates are slidably matched with the guide grooves.

[0012] An electronic shifter comprises the above-mentioned single-motor worm gear driven lifting mechanism.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application adopts a rigid meshing chain of worm-worm gear composite part-transmission gear to replace the traditional synchronous belt drive and eliminate elastic deformation; the self-locking characteristics of the worm gear meshing are utilized to automatically lock the screw position when the motor is powered off, completely eliminating the risk of accidental displacement of the handball; and the transmission gear and the screw connecting shaft are interference fit, the lower end abuts the limit step, interference press-fit, and zero looseness and stable assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is a schematic structural diagram of the utility model without the outer shell;

[0016] Figure 3 This is a top view of the utility model without the outer shell;

[0017] Figure 4 It is a cross-sectional view of AA of the present utility model;

[0018] Figure 5 It is a schematic diagram of the screw rod assembly structure in the utility model.

[0019] Figure numerals: 1. driving motor; 2. worm gear complex; 3. worm; 4. lead screw; 5. nut sleeve; 6. worm wheel part; 7. gear part; 8. transmission gear; 9. mounting base; 10. through hole; 11. positioning shaft; 12. connecting shaft; 13. limiting step; 14. matching shaft; 15. mounting shaft; 16. bearing; 17. first retaining spring; 18. positioning hole; 19. smooth rod part; 20. step surface; 21. retaining ring; 22. second retaining spring; 23. PCB board; 24. micro switch; 25. outer shell; 26. guide groove; 27. slide plate; 28. guide plate. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0021] The specific embodiments of the present utility model are described below with reference to the accompanying drawings.

[0022] like Figures 1 to 5 The single-motor worm gear drive lifting mechanism and electronic shifter shown in the figure include a drive motor 1, a worm gear complex 2, a worm 3, a screw 4 and a nut sleeve 5; the output shaft of the drive motor 1 is connected to the worm 3; the worm gear complex 2 and the worm 3 are meshed for transmission; the screw 4 is driven to rotate by the worm gear complex 2; the nut sleeve 5 is threadedly engaged with the screw 4, and a guide structure is provided on one side of the nut sleeve to limit circumferential rotation; the nut sleeve 5 is used to mount the handball.

[0023] This application adopts a rigid meshing chain of worm 3-worm gear composite 2-transmission gear 8 to replace the traditional synchronous belt drive and eliminate elastic deformation; utilizing the self-locking characteristics of the meshing of the worm gear 3, the position of the screw rod 4 is automatically locked when the motor is powered off, completely eliminating the risk of accidental displacement of the handball; and the transmission gear 8 and the screw rod 4 connecting shaft 12 have an interference fit, and the lower end abuts the limit step 13, and the interference fit is pressed, with zero looseness and stable assembly. The lifting structure of this application is specifically used in electronic shifters to realize the lifting and lowering of the handball (not shown in the figure).

[0024] The worm gear composite 2 includes a coaxially arranged worm wheel portion 6 and a gear portion 7; the worm wheel portion 6 is meshed with the worm 3; the lower portion of the screw 4 is provided with a transmission gear 8 that meshes with the gear portion 7. In this embodiment, the worm wheel portion 6 and the gear portion 7 are integrally formed, and the worm wheel portion 6 is located above the gear portion 7, but can also be assembled separately.

[0025] It also includes a mounting base 9 , on which the worm gear complex 2 and the screw 4 are rotatably mounted. A through hole 10 is provided at the center of the worm gear complex 2 , and the mounting base 9 is provided with a positioning shaft 11 that penetrates the through hole 10 .

[0026] A connecting shaft 12 is provided at the lower part of the screw rod 4, and a limiting step 13 is provided on the outer wall of the connecting shaft 12. The limiting step 13 divides the connecting shaft 12 into a mating shaft portion 14 and an installation shaft portion 15; the transmission gear 8 is sleeved on the installation shaft portion 15, and the lower end abuts the limiting step 13; the mating shaft portion 14 is outer-circuited with a bearing 16 and a first retaining spring 17 for fixing the bearing 16 on the mating shaft portion 14, and the mounting base 9 is provided with a positioning hole 18 for embedding the bearing 16, so that the parts can be assembled on the screw rod 4 and then installed into the outer shell 25, which simplifies the assembly process and improves assembly efficiency.

[0027] A polished rod portion 19 is provided on the upper part of the screw rod 4, and a step surface 20 is formed at the connection between the polished rod portion 19 and the threaded portion of the screw rod 4; the polished rod portion 19 is sleeved with a retaining ring 21 abutting the step surface 20; a second retaining spring 22 is provided at the end of the polished rod portion 19 for axially constraining the retaining ring 21.

[0028] It also includes: a PCB board 23, which is arranged on one side of the screw rod 4; two micro switches 24, which are arranged at both ends of the length direction of the PCB board 23, and are used to detect the lifting and lowering limit positions of the nut sleeve 5. The micro switch 24 directly detects the limit position of the nut sleeve 5, avoids the cumulative error of the encoder, and realizes precise control of the lifting position. In this embodiment, the micro switch 24 is commercially available and is not an improvement point of this application, so the working principle is not elaborated in detail.

[0029] It also includes: an outer shell 25, fixed to the mounting base 9; a guide plate 28, symmetrically fixed to the inner wall of the outer shell 25, and a longitudinally extending guide groove 26 is provided on the inner side thereof; slide plates 27 are provided on both sides of the nut sleeve 5, and the slide plates 27 slide in conjunction with the guide groove 26. The sliding cooperation structure of the guide plate 28 and the slide groove prevents the nut sleeve 5 from deflecting and realizes stable transmission.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A single motor worm gear driven lifting mechanism, characterized by: The invention comprises a driving motor (1), a worm gear composite component (2), a worm (3), a screw (4) and a nut sleeve (5); the output shaft of the driving motor (1) is connected to the worm (3); the worm gear composite component (2) and the worm (3) are meshed and driven; the screw (4) is driven to rotate by the worm gear composite component (2); the nut sleeve (5) is threadedly matched with the screw (4), and a guide structure for limiting circumferential rotation is provided on one side of the nut sleeve (5); the nut sleeve (5) is used for mounting a handball; and further comprises: a PCB board (23) provided on one side of the screw (4); and two micro switches (24) provided at both ends of the length direction of the PCB board (23) for detecting the lifting limit position of the nut sleeve (5).

2. The single motor worm gear driven lifting mechanism according to claim 1, characterized in that: The worm gear composite component (2) comprises a coaxially arranged worm wheel portion (6) and a gear portion (7); the worm wheel portion (6) meshes with the worm (3); and a transmission gear (8) meshing with the gear portion (7) is provided at the lower portion of the lead screw (4).

3. The single motor worm gear driven lifting mechanism according to claim 2, characterized in that: The worm wheel portion (6) and the gear portion (7) are integrally formed, and the worm wheel portion (6) is located above the gear portion (7).

4. The single-motor worm gear driven lifting mechanism according to claim 2, characterized in that: It also includes a mounting base (9), on which the worm gear complex (2) and the screw rod (4) are rotatably mounted.

5. The single-motor worm gear driven lifting mechanism according to claim 4, characterized in that: A through hole (10) is provided at the center of the worm gear composite component (2), and a positioning shaft (11) is provided on the mounting base (9) that penetrates into the through hole (10).

6. The single-motor worm gear driven lifting mechanism according to claim 4, characterized in that: A connecting shaft (12) is provided at the lower part of the screw rod (4), and a limiting step (13) is provided on the outer wall of the connecting shaft (12), and the limiting step (13) separates the connecting shaft (12) into a matching shaft portion (14) and a mounting shaft portion (15); the transmission gear (8) is sleeved on the mounting shaft portion (15), and the lower end abuts the limiting step (13); the outer sleeve of the matching shaft portion (14) is provided with a bearing (16) and a first retaining spring (17) for fixing the bearing (16) on the matching shaft portion (14), and the mounting base (9) is provided with a positioning hole (18) for embedding the bearing (16).

7. The single-motor worm gear driven lifting mechanism according to claim 4, characterized in that: A polished rod portion (19) is provided on the upper portion of the screw rod (4), and a step surface (20) is formed at the connection between the polished rod portion (19) and the threaded portion of the screw rod (4); a retaining ring (21) is sleeved on the polished rod portion (19) and abuts against the step surface (20); a second retaining spring (22) is provided at the end of the polished rod portion (19) for axially constraining the retaining ring (21).

8. The single-motor worm gear driven lifting mechanism according to claim 4, characterized in that: Also includes: An outer shell (25) is fixed to the mounting base (9); a guide plate (28) is symmetrically fixed to the inner wall of the outer shell (25), and a longitudinally extending guide groove (26) is provided on the inner side thereof; slide plates (27) are provided on both sides of the nut sleeve (5), and the slide plates (27) are slidably matched with the guide groove (26).

9. An electronic shifter, characterized in that: A single motor worm (3) gear-driven lifting mechanism comprising any one of claims 1-8.

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