Full helical tooth transmission structure of shaver

Abstract

The utility model relates to a full helical tooth transmission structure of a shaver, which comprises a motor, a motor helical gear, a motor frame, a helical tooth inner gear ring, a transmission shaft, a tool bit bottom shell, a partition plate, a driving gear, a driven gear and an output rotor, the motor is fixedly mounted in the motor frame, and an output shaft of the motor is fixedly connected with the motor helical gear. The transmission shaft is rotationally connected to the upper side of the motor frame, the helical tooth inner gear ring is fixed to the transmission shaft, the motor helical gear is arranged on the inner side of the helical tooth inner gear ring in a meshed mode, and the upper end of the transmission shaft is connected with the connecting rotor assembly. The driving gear is rotationally matched on the partition plate and connected with the connecting rotor assembly, the three driven gears are rotationally matched on the tool bit bottom shell and meshed with the driving gear, and each driven gear is connected with an output rotor penetrating out of the upper side of the partition plate.

Description

Technical Field

[0001] The utility model relates to the technical field of shavers, in particular to a full-bevel gear transmission structure of a shaver. Background Art

[0002] As a frequently used personal care appliance, electric shavers' noise levels and vibration stability during operation directly impact the user experience. As consumers' demands for quietness, comfort, and durability continue to rise, optimizing the shaver's internal drive system has become a key step in improving overall performance.

[0003] Currently, most electric shavers use a transmission structure consisting of multiple spur gears to reduce and output motor power. While this structure is simple to manufacture and low-cost, it suffers from significant technical drawbacks in practical applications. Spur gears mesh with line contact, resulting in low overlap and prone to periodic impacts at high speeds, leading to unstable transmission, high vibration, and noise. Furthermore, due to the lack of continuity in the meshing process, frequent impact contact between gears accelerates wear, impacting the lifespan and reliability of the transmission system.

[0004] Therefore, it is necessary to make improvements to the above technical problems in order to reduce the noise of the shaver transmission structure and improve its vibration stability. Utility Model Content

[0005] The utility model provides a low-noise, highly stable full-bevel gear transmission structure for a shaver, which solves the above-mentioned problems existing in the use process of the prior art.

[0006] The technical solution of the present utility model is achieved as follows: a full helical gear transmission structure of a shaver includes a motor, a motor helical gear, a motor frame, a helical gear internal gear ring, a transmission shaft, a cutter head bottom shell, a partition, a driving gear, a driven gear and an output rotor, wherein the motor is fixedly installed in the motor frame, the output shaft of the motor is exposed from the upper side of the motor frame and is fixedly connected to the motor helical gear, the transmission shaft is rotatably connected to the upper side of the motor frame, the helical gear internal gear ring is fixed on the transmission shaft, the motor helical gear is meshed with the inner side of the helical gear internal gear ring, and the motor helical gear and the helical gear internal gear ring are engaged with each other. The rings all adopt a helical tooth structure, the upper end of the transmission shaft is connected to the connecting rotor assembly, the cutter head bottom shell is located on the upper side of the helical gear inner ring, the partition is fixed on the cutter head bottom shell, and a transmission space is formed between the partition and the cutter head bottom shell, the driving gear rotatably fits on the side of the partition facing the transmission space and is connected to the connecting rotor assembly, three driven gears are provided and are evenly distributed circumferentially in the transmission space, each of the driven gears rotatably fits on the cutter head bottom shell and meshes with the driving gear, and each of the driven gears is connected to an output rotor that passes through the upper side of the partition.

[0007] Preferably, the driving gear and the driven gear both adopt a helical gear meshing structure.

[0008] Preferably, an upwardly protruding sleeve is fixedly connected to the upper side of the motor frame, the lower end of the transmission shaft is rotatably connected in the sleeve, and a supporting convex ring located at the upper end of the sleeve is provided on the lower side of the helical inner gear ring.

[0009] Preferably, a self-lubricating wear-resistant sleeve is provided in the fixed sleeve of the sleeve, and the self-lubricating wear-resistant sleeve includes an annular convex edge that abuts against the upper end of the sleeve. The lower end of the transmission shaft is rotatably connected in the self-lubricating wear-resistant sleeve, and the abutting convex ring abuts against the annular convex edge.

[0010] Preferably, a fixed shaft is fixedly connected to the middle of the partition, the driving gear is rotatably connected to the fixed shaft, the cutter head bottom shell is integrally formed with a connecting cam corresponding to each of the driven gears, and the driven gear is rotatably fitted on the connecting cam.

[0011] Preferably, the connecting rotor assembly includes an inner rotor and an outer rotor, the inner rotor is fixed to the upper end of the transmission shaft, the upper end of the outer rotor is integrally formed with a plurality of clips, the lower side of the driving gear is integrally formed with a clip groove seat for the clips to be snapped into, the upper side of the inner rotor is provided with a socket, the lower end of the outer rotor is inserted into the socket, the outer rotor is provided with a spring opening on the opening field, and the spring opening is provided with a spring that is supported between the outer rotor and the driving gear.

[0012] Preferably, a plurality of second buckles are integrally formed on the lower end of the output rotor, a second buckle slot for the second buckles to be snapped into is integrally formed on the upper side of the driven gear, and a second spring is provided between the output rotor and the driven gear.

[0013] Preferably, the partition is provided with a dust cover wrapped around the output rotor.

[0014] In summary, the beneficial effects of the present invention are:

[0015] 1. This application utilizes a reduction transmission system that uses a motor helical gear and a helical internal gear ring. Through a fully helical transmission structure, the motor helical gear and the helical internal gear ring are configured for helical meshing, and both the driving and driven gears are configured for helical meshing. This significantly increases the overlap of the gear meshing, achieving continuous and progressive meshing of multiple pairs of teeth, effectively distributing loads and reducing impact vibration, thereby significantly reducing operating noise and improving transmission smoothness. Furthermore, the helical gear structure offers higher tooth surface strength and fatigue resistance, extending the service life of the transmission system.

[0016] 2. An upwardly projecting sleeve is installed on the motor frame, and the lower end of the drive shaft is rotatably connected to the sleeve, forming a radial support structure for the drive shaft, effectively limiting its radial runout and improving rotational coaxiality. At the same time, a supporting ring, located on the lower side of the helical inner gear ring and at the upper end of the sleeve, constitutes an axial limiter. This prevents the helical inner gear ring and drive shaft from moving upward or axially under the axial force of the helical gears, ensuring the stable meshing position of the gears and avoiding increased noise or wear caused by meshing offset, further enhancing the structural stability and operational reliability of the transmission system.

[0017] 3. By fixing a self-lubricating wear-resistant sleeve within the shaft sleeve and allowing the lower end of the drive shaft to rotate within it, a low-friction, maintenance-free sliding bearing-type support is achieved. The self-lubricating wear-resistant sleeve provides continuous lubrication without the need for external grease, preventing wear and noise caused by dry friction. Simultaneously, its annular ridge abuts against the upper end of the shaft sleeve, forming a stable load-bearing surface. The supporting ridge of the helical inner gear ring presses against this ridge, effectively transmitting and carrying axial force. This structure improves the wear resistance and life of the support part.

[0018] 4. A fixed shaft is located in the center of the partition to support the driving gear. Its simple structure and precise positioning ensure the stability of the driving gear's rotational center, which helps maintain a constant meshing clearance with the driven gear. Furthermore, the cutter head base housing has integrally formed connecting cams corresponding to each driven gear, allowing the driven gear to rotate directly onto these cams, eliminating the need for additional fasteners or bearings, simplifying the assembly process and reducing costs. This integrated structure enhances local rigidity, reduces gear vibration and noise caused by loose supports, and improves transmission accuracy and long-term operational stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 This is a structural diagram of the utility model without the motor frame;

[0023] Figure 4 This is a structural diagram of the cutter head bottom shell, driving gear and driven gear in the utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of structural explosion;

[0025] Figure 6 This is a schematic structural diagram of the driving gear and the driven gear in the present utility model;

[0026] Figure 7 It is a structural schematic diagram of the driving gear, the inner rotor and the outer rotor in the utility model.

[0027] In the figure: 11, motor; 12, motor helical gear; 13, motor frame; 131, bushing; 14, self-lubricating wear-resistant sleeve; 141, annular convex edge; 21, helical inner gear ring; 211, supporting convex ring; 22, transmission shaft; 31, cutter head bottom shell; 311, connecting convex shaft; 32, partition; 33, fixed shaft; 34, transmission space; 40, driving gear; 401, buckle slot seat; 41, driven gear; 411, second buckle slot seat; 51, internal rotor; 511, socket; 52, external rotor; 521, buckle; 522, spring mouth; 53, spring; 61, output rotor; 611, second buckle; 62, second spring; 70, dust cover; 80, seal. DETAILED DESCRIPTION

[0028] The following is a combination of the appended examples of the present invention Figure 1-7 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example:

[0030] like Figures 1 to 7As shown, the utility model discloses a full helical gear transmission structure of a shaver, including a motor 11, a motor helical gear 12, a motor frame 13, a helical gear inner ring 21, a transmission shaft 22, a cutter head bottom shell 31, a partition 32, a driving gear 40, a driven gear 41 and an output rotor 61, wherein the motor 11 is fixedly mounted in the motor frame 13. It should be noted that the motor frame 13 is fixed inside the shaver housing, and the motor 11, the motor helical gear 12 and the helical gear inner ring 21 are all located inside the shaver housing. The upper end of the shaver housing is connected and fixed to the cutter head bottom shell 31, and a seal 80 is provided between the shaver housing and the transmission shaft 22. The setting of the shaver housing is common knowledge to those skilled in the art, and it is not the content to be protected by this application, so it will not be described in detail. In the present invention, the output shaft of the motor 11 is exposed from the upper side of the motor frame 13 and is fixedly connected to the motor helical gear 12. The lower end of the transmission shaft 22 is rotatably connected to the upper side of the motor frame 13. The helical inner gear ring 21 is fixed on the transmission shaft 22. The motor helical gear 12 is meshed and arranged on the inner side of the helical inner gear ring 21. The motor helical gear 12 and the helical inner gear ring 21 both adopt a helical tooth structure, with the same tooth surface inclination angle and matching rotation direction, ensuring that the contact line gradually migrates during the meshing process, achieving continuous meshing with high overlap, and effectively reducing meshing impact and operating noise. A connecting rotor assembly is connected to the upper end of the transmission shaft 22, wherein the cutter head bottom shell 31 is located on the helical inner gear ring 21. On the upper side, the partition 32 is fixed to the cutter head bottom shell 31 by screws, and a transmission space 34 is formed between the partition 32 and the cutter head bottom shell 31. The driving gear 40 is rotatably fitted on the side of the partition 32 facing the transmission space 34 and is connected to the connecting rotor assembly. In addition, three driven gears 41 are provided and are evenly distributed circumferentially in the transmission space 34. Each driven gear 41 is rotatably fitted on the cutter head bottom shell 31 and meshes with the driving gear 40. The driving gear 40 and the driven gear 41 both adopt a helical tooth meshing structure. Each driven gear 41 is connected to an output rotor 61 that passes through the upper side of the partition 32. The output rotor 61 is used to drive the shaver head to rotate.

[0031] Furthermore, a shaft sleeve 131 protruding upward is fixedly connected to the upper side of the motor frame 13, the lower end of the transmission shaft 22 is rotatably connected in the shaft sleeve 131, and a supporting convex ring 211 located at the upper end of the shaft sleeve 131 is provided on the lower side of the helical inner gear ring 21. Furthermore, a self-lubricating wear-resistant sleeve 14 is provided in the shaft sleeve 131 through an interference fit or adhesive fixing sleeve. The self-lubricating wear-resistant sleeve 14 can be made of a copper-based oil-containing material or a PTFE composite material, and has good self-lubricating and wear-resistant properties. The lower end of the transmission shaft 22 rotates in the self-lubricating wear-resistant sleeve 14, with low friction resistance and long-term stable operation. The self-lubricating wear-resistant sleeve 14 also includes an annular ridge 141 that abuts against the upper end of the sleeve 131. The lower end of the transmission shaft 22 is rotatably connected to the self-lubricating wear-resistant sleeve 14, and the abutting convex ring 211 abuts against the annular ridge 141, forming a reliable axial load-bearing interface, and transmitting the generated axial force to the motor frame 13 through the wear-resistant sleeve, avoiding axial movement of the transmission shaft 22, thereby ensuring the constant gear meshing position and improving transmission accuracy and durability.

[0032] In the present invention, a fixed shaft 33 is fixedly connected to the middle of the partition 32, and the driving gear 40 is rotatably connected to the fixed shaft 33. The cutter head bottom shell 31 is integrally formed with a connecting cam 311 corresponding to each driven gear 41, and the driven gear 41 is rotatably fitted on the connecting cam 311.

[0033] In the present invention, the connecting rotor assembly includes an inner rotor 51 and an outer rotor 52. The inner rotor 51 is fixed to the upper end of the transmission shaft 22. A plurality of clips 521 are integrally formed on the upper end of the outer rotor 52. A clip groove seat 401 for the clips 521 to be snapped into is integrally formed on the lower side of the driving gear 40. A socket 511 is provided on the upper side of the inner rotor 51. The lower end of the outer rotor 52 is inserted into the socket 511. The clips 521 of the outer rotor 52 are snapped into the clip groove seat 401 of the driving gear 40 to achieve circumferential fixation, thereby transmitting the rotational torque of the inner rotor 51 to the driving gear 40. A spring opening 522 with an opening field is provided in the outer rotor 52. A spring 53 is provided in the spring opening 522 to abut between the outer rotor 52 and the driving gear 40, forming an elastic pre-tightening structure to prevent the clips 521 from loosening, thereby improving the reliability of the connection and the smooth operation.

[0034] In addition, the lower end of the output rotor 61 is integrally formed with several second clips 611, and the upper side of the driven gear 41 is integrally formed with a second clip groove seat 411 for the second clip 611 to be snapped into, thereby achieving quick connection and torque transmission. A second spring 62 is provided between the output rotor 61 and the driven gear 41 to allow the output rotor 61 to have a certain floating effect.

[0035] In order to prevent external impurities from entering the transmission area and affecting the operating performance, a dust cover 70 is provided on the partition 32 and wrapped around the output rotor 61.

[0036] During operation, the motor 11 is energized to drive its output shaft to rotate, thereby driving the motor helical gear 12 to rotate. The motor helical gear 12 meshes with the helical inner ring gear 21, driving the helical inner ring gear 21 and the transmission shaft 22 to which it is fixed to rotate at a reduced speed. The transmission shaft 22 drives the internal rotor 51 and the external rotor 52 to rotate synchronously, and the external rotor 52 drives the driving gear 40 to rotate through the buckle 521 structure. The driving gear 40 drives the three driven gears 41 to rotate around their respective axes, and each driven gear 41 drives the output rotor 61 to rotate through the second buckle 611, and finally transmits power to the shaver head to complete the shaving action. During the entire transmission process, all gears are helical gear structures with high meshing overlap, continuous and smooth transmission, and significantly reduced mechanical noise and vibration. At the same time, through the synergistic effect of the shaft sleeve 131, the self-lubricating wear-resistant sleeve 14, the supporting convex ring 211 and the annular convex edge 141, the stability problem caused by the axial force of the helical gear is effectively solved, ensuring the structural reliability under high-speed operation.

[0037] It should also be pointed out that the terms indicated in the present invention, such as: "front", "rear", "vertical", "horizontal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shaver full bevel gear transmission structure, characterized by: The invention comprises a motor, a motor helical gear, a motor frame, a helical internal gear ring, a transmission shaft, a cutter head bottom shell, a partition, a driving gear, a driven gear and an output rotor. The motor is fixedly mounted in the motor frame, the output shaft of the motor is exposed from the upper side of the motor frame and is fixedly connected to the motor helical gear, the transmission shaft is rotatably connected to the upper side of the motor frame, the helical internal gear ring is fixed on the transmission shaft, the motor helical gear is meshed with the inner side of the helical internal gear ring, the motor helical gear and the helical internal gear ring both adopt a helical gear structure, the upper end of the transmission shaft is connected to a connecting rotor assembly, the cutter head bottom shell is located on the upper side of the helical internal gear ring, the partition is fixed on the cutter head bottom shell, a transmission space is formed between the partition and the cutter head bottom shell, the driving gear is rotatably fitted on the side of the partition facing the transmission space and is connected to the connecting rotor assembly, three driven gears are provided and are evenly distributed circumferentially in the transmission space, each of the driven gears is rotatably fitted on the cutter head bottom shell and meshes with the driving gear, and each of the driven gears is connected to an output rotor that passes through the upper side of the partition.

2. The full-bevel gear transmission structure of a shaver according to claim 1, characterized in that: The driving gear and the driven gear both adopt a helical gear meshing structure.

3. The full-bevel gear transmission structure of a shaver according to claim 1, characterized in that: An upwardly protruding shaft sleeve is fixedly connected to the upper side of the motor frame, the lower end of the transmission shaft is rotatably connected in the shaft sleeve, and a supporting convex ring located at the upper end of the shaft sleeve is provided on the lower side of the helical inner gear ring.

4. The full-bevel gear transmission structure of a shaver according to claim 3, characterized in that: The fixed sleeve in the sleeve is provided with a self-lubricating wear-resistant sleeve, which includes an annular convex edge that abuts against the upper end of the sleeve. The lower end of the transmission shaft is rotatably connected in the self-lubricating wear-resistant sleeve, and the abutting convex ring abuts against the annular convex edge.

5. The full-bevel gear transmission structure for a shaver according to claim 1, characterized in that: A fixed shaft is fixedly connected to the middle of the partition, the driving gear is rotatably connected to the fixed shaft, and the cutter head bottom shell is integrally formed with a connecting convex shaft corresponding to each of the driven gears, and the driven gear is rotatably fitted on the connecting convex shaft.

6. A full-bevel gear transmission structure for a shaver according to any one of claims 1 to 5, characterized in that: The connecting rotor assembly includes an inner rotor and an outer rotor. The inner rotor is fixed to the upper end of the transmission shaft. The upper end of the outer rotor is integrally formed with a plurality of clips. The lower side of the driving gear is integrally formed with a clip groove seat for the clips to be inserted into. The upper side of the inner rotor is provided with a socket, and the lower end of the outer rotor is inserted into the socket. The outer rotor is provided with a spring opening on an opening field, and the spring opening is provided with a spring that is supported between the outer rotor and the driving gear.

7. The full-bevel gear transmission structure for a shaver according to claim 4, characterized in that: The lower end of the output rotor is integrally formed with a plurality of second buckles, the upper side of the driven gear is integrally formed with a second buckle slot for the second buckles to be snapped into, and a second spring is provided between the output rotor and the driven gear.

8. The full-bevel gear transmission structure for a shaver according to claim 1, characterized in that: The partition is provided with a dust cover wrapped around the output rotor.

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