Noise reduction worm gear and reduction motor

Abstract

The application discloses a noise reduction worm gear and a reduction motor. The noise reduction worm gear comprises a non-metal gear body and a metal insert, the non-metal gear body is used for meshing with a worm, and the metal insert is embedded in an inner circumferential surface of the non-metal gear body, wherein the non-metal gear body is formed on the metal insert through one-time injection molding. In this way, the noise reduction worm gear has the advantages of good strength, low transmission noise and low manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of geared motor technology, and in particular to a noise-reducing worm gear and a geared motor. Background Technology

[0002] Electric pedals typically use geared motors with a self-locking function. These motors achieve both speed reduction and self-locking through worm gear transmission. Due to strength requirements, worm gears are generally made of metal. However, metal worm gears and worm shafts generate more noise during transmission, and their manufacturing cost is also higher. Utility Model Content

[0003] The noise-reducing worm gear and geared motor provided in this application can solve the problems of high noise and high manufacturing cost generated by worm gears and worms during transmission in the prior art.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a noise-reducing worm gear for meshing with a worm, the noise-reducing worm gear comprising: a non-metallic gear body for meshing with the worm; and a metal insert embedded in the inner circumferential surface of the non-metallic gear body; wherein the non-metallic gear body is formed into the metal insert by one injection molding.

[0005] In some embodiments, the material of the non-metallic gear body includes at least one of nylon, carbon fiber, and polyetheretherketone.

[0006] In some embodiments, the thickness of the non-metallic gear body is greater than or equal to 4 mm and less than or equal to 9 mm.

[0007] In some embodiments, the thickness of the metal insert is greater than or equal to 4 mm and less than or equal to 9 mm.

[0008] In some embodiments, the ratio of the thickness of the non-metallic gear body to the thickness of the metallic insert ranges from 0.45:1 to 1:0.45.

[0009] In some embodiments, the ratio of the thickness of the non-metallic gear body to the thickness of the metal insert is 1:1.

[0010] In some embodiments, the non-metallic gear body has an internal spline on its inner circumferential surface and an external spline on its outer circumferential surface, the external spline meshing with the internal spline.

[0011] In some embodiments, the inner circumferential surface of the non-metallic gear body is further provided with a ring key, the metal insert is provided with a ring groove, and the ring key is bonded to the ring groove.

[0012] In some embodiments, the non-metallic gear body includes an external tooth portion, which is uniformly distributed along the outer circumferential surface of the non-metallic gear body. The external tooth portion is provided with a throat circle, the diameter of which is greater than or equal to 10 mm and less than or equal to 14 mm.

[0013] Another technical solution adopted in this application is: providing a geared motor, the geared motor comprising: a noise-reducing worm gear, including a non-metallic gear body and a metal insert embedded in the inner circumferential surface of the non-metallic gear body; a worm gear meshing with the non-metallic gear body; and an output shaft interference fit with the metal insert; wherein, the noise-reducing worm gear is any of the noise-reducing worm gears described above.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, the noise-reducing worm gear provided in this application is used to mesh with a worm. The noise-reducing worm gear includes: a non-metallic gear body for meshing with the worm; and a metal insert embedded in the inner circumferential surface of the non-metallic gear body; wherein the non-metallic gear body is injection molded onto the metal insert in a single process. In this technical solution, during the meshing and transmission process between the non-metallic gear body and the worm, the non-metallic gear body can absorb vibration, thereby reducing noise. The use of a non-metallic material for the gear body and its single injection molding onto the metal insert reduces the manufacturing cost of the noise-reducing worm gear. In this way, the noise-reducing worm gear possesses advantages such as good strength, low transmission noise, and low manufacturing cost. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 These are schematic diagrams of the geared motor provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of a noise-reducing worm gear provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a non-metallic gear body provided in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a metal insert provided in some embodiments of this application.

[0017] Explanation of reference numerals in the attached figures: 1000 - Gear motor, 100 - Noise-reducing worm gear, 110 - Non-metallic gear body, 111 - Internal spline, 112 - Ring key, 113 - External tooth, 1131 - Throat circle, 120 - Metal insert, 121 - External spline, 122 - Ring groove, 200 - Worm, 300 - Output shaft. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] The noise-reducing worm gear provided in this application is used to mesh with a worm. The noise-reducing worm gear includes: a non-metallic gear body for meshing with the worm; and a metal insert embedded in the inner circumferential surface of the non-metallic gear body; wherein the non-metallic gear body is injection molded onto the metal insert in a single process. In this technical solution, during the meshing transmission between the non-metallic gear body and the worm, the non-metallic gear body can absorb vibration, thereby reducing noise. The use of a non-metallic material for the gear body and its single injection molding onto the metal insert reduces the manufacturing cost of the noise-reducing worm gear. In this way, the noise-reducing worm gear possesses advantages such as good strength, low transmission noise, and low manufacturing cost.

[0022] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a geared motor provided in some embodiments of this application. The geared motor 1000 includes at least a noise-reducing worm gear 100, a worm 200, and an output shaft 300. The noise-reducing worm gear 100 includes a non-metallic gear body 110 and a metal insert 120 embedded in the inner circumferential surface of the non-metallic gear body 110. The worm 200 meshes with the non-metallic gear body 110 to absorb transmission vibration. The output shaft 300 is interference-fitted with the metal insert 120 to transmit output torque to the non-metallic gear body 110 via the metal insert 120. This achieves low-noise operation of the entire geared motor 1000.

[0023] Please refer to the following: Figure 2-4 . Figure 2 This is a schematic diagram of the structure of a noise-reducing worm gear provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a non-metallic gear body provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of a metal insert provided in some embodiments of this application. The noise-reducing worm gear 100 provided in this application is used to mesh with a worm 200. The noise-reducing worm gear 100 includes at least a non-metallic gear body 110 and a metal insert 120. The non-metallic gear body 110 meshes with the worm 200. The metal insert 120 is embedded in the inner circumferential surface of the non-metallic gear body 110. The non-metallic gear body 110 is injection molded into the metal insert 120 in a single process to simplify the machining process of the noise-reducing worm gear 100 and reduce manufacturing costs.

[0024] In this embodiment, the material of the non-metallic gear body 110 includes at least one of nylon, carbon fiber and polyetheretherketone.

[0025] Polyetheretherketone (PEEK) exhibits excellent wear resistance, high-temperature resistance, and chemical stability, enabling it to operate stably for extended periods in harsh environments. It also possesses a low coefficient of friction and good mechanical rigidity, allowing the non-metallic gear body 110 to withstand high-speed and high-load operating conditions.

[0026] In some embodiments, polyetheretherketone (PEEK) can be replaced by one or more combinations of high-density materials such as polyimide, polyetheramide, polyamide-imide, polyetherketoneketone, or polyphenylene sulfide. Carbon fiber can be replaced by one or more combinations of fibrous materials such as glass fiber, aramid fiber, wood fiber, flax fiber, or hemp fiber. Nylon can be at least one of materials such as PA66, PA6T, PA9T, and PA46. In this embodiment, the non-metallic gear body 110 is prepared using PA66, carbon fiber, and PEEK. Carbon fiber can reinforce PEEK and PA66 to improve the strength of the non-metallic gear body 110.

[0027] Furthermore, the thickness of the non-metallic gear body 110 is greater than or equal to 4 mm and less than or equal to 9 mm. This avoids the geared motor 1000 losing its low-noise effect due to the non-metallic gear body 110 being too thin. Specifically, the thickness of the non-metallic gear body 110 can be 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5.1 mm, 5.3 mm, 5.5 mm, 6.4 mm, 7.1 mm, 7.6 mm, 8.2 mm, 8.8 mm, or 9 mm, etc. In this embodiment, the thickness of the non-metallic gear body 110 is 7.44 mm.

[0028] Furthermore, the thickness of the metal insert 120 is greater than or equal to 4 mm and less than or equal to 9 mm. Specifically, the thickness of the metal insert 120 can be 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5.1 mm, 5.3 mm, 5.5 mm, 6.4 mm, 7.1 mm, 7.6 mm, 8.2 mm, 8.8 mm, or 9 mm, etc. In this embodiment, the thickness of the metal insert 120 is 8.51 mm.

[0029] Furthermore, the ratio of the thickness of the non-metallic gear body 110 to the thickness of the metal insert 120 ranges from 0.45:1 to 1:0.45. This avoids poor noise reduction performance due to either an excessively thick metal insert 120 or an excessively thin non-metallic gear body 110. Preferably, the ratio of the thickness of the non-metallic gear body 110 to the thickness of the metal insert 120 is 1:1, to simultaneously ensure the noise-reducing worm gear 100 has good strength, low transmission noise, reliable molding, and low cost. In this embodiment, the ratio of the thickness of the non-metallic gear body 110 to the thickness of the metal insert 120 is 0.87:1. It should be noted that the thickness of both the non-metallic gear body 110 and the metal insert 120 are their radial lengths.

[0030] In some embodiments, the inner circumferential surface of the non-metallic gear body 110 is provided with an internal spline 111. The outer circumferential surface of the metal insert 120 is provided with an external spline 121. The external spline 121 meshes with the internal spline 111. In this way, the contact area between the non-metallic gear body 110 and the metal insert 120 can be increased, stress can be dispersed, thereby enhancing the torsional strength of the non-metallic gear body 110 and the connection strength between the metal insert 120 and the non-metallic gear body 110.

[0031] In some embodiments, the inner circumferential surface of the non-metallic gear body 110 is also provided with a ring key 112. The metal insert 120 is provided with a ring groove 122, and the ring key 112 is bonded to the ring groove 122 to enhance the axial positioning and anti-dislodgement capability of the non-metallic gear body 110 and the metal insert 120. After the ring key 112 is embedded in the ring groove 122, it forms an axial limiting structure to prevent the non-metallic gear body 110 from slipping or falling off when subjected to vibration, impact or other forces, and at the same time to prevent the non-metallic gear body 110 from sliding axially after injection molding.

[0032] In some embodiments, the non-metallic gear body 110 includes external teeth 113. The external teeth 113 are uniformly distributed along the outer circumferential surface of the non-metallic gear body 110. The external teeth 113 are provided with a throat circle 1131 to increase the contact area between the non-metallic gear body 110 and the worm gear 200, thereby improving the load-bearing capacity of the external teeth 113 of the non-metallic gear body 110 and the pitting corrosion resistance of the non-metallic gear body 110 under high-load conditions. The diameter of the throat circle 1131 is greater than or equal to 10 mm and less than or equal to 14 mm. Specifically, the diameter of the throat circle 1131 can be 10 mm, 10.3 mm, 10.8 mm, 11.2 mm, 11.5 mm, 11.9 mm, 12.2 mm, 12.5 mm, 12.7 mm, 13 mm, 13.4 mm, 13.7 mm, or 14 mm, etc. Preferably, in this embodiment, the diameter of the throat circle 1131 is 12.44 mm.

[0033] The noise-reducing worm gear 100 provided in this application is used to mesh with a worm 200. The noise-reducing worm gear 100 includes: a non-metallic gear body 110 for meshing with the worm 200; and a metal insert 120 embedded in the inner circumferential surface of the non-metallic gear body 110. The non-metallic gear body 110 is integrally injection molded into the metal insert 120. In this technical solution, during the meshing and transmission process between the non-metallic gear body 110 and the worm 200, the non-metallic gear body 110 can absorb vibration, thereby reducing noise. The use of a non-metallic material for the gear body and the integral injection molding of the non-metallic gear body 110 into the metal insert 120 reduce the manufacturing cost of the noise-reducing worm gear 100. In this way, the noise-reducing worm gear 100 has the advantages of good strength, low transmission noise, and low manufacturing cost.

[0034] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A noise-reducing worm gear for meshing with a worm, characterized in that, include: A non-metallic gear body for meshing with the worm gear; as well as A metal insert is embedded in the inner circumferential surface of the non-metallic gear body; The non-metallic gear body is injection molded onto the metal insert in a single injection molding process.

2. The noise-reducing worm gear according to claim 1, characterized in that, The material of the non-metallic gear body includes at least one of nylon, carbon fiber, and polyetheretherketone.

3. The noise-reducing worm gear according to claim 1, characterized in that, The thickness of the non-metallic gear body is greater than or equal to 4 mm and less than or equal to 9 mm.

4. The noise-reducing worm gear according to claim 1, characterized in that, The thickness of the metal insert is greater than or equal to 4 mm and less than or equal to 9 mm.

5. The noise-reducing worm gear according to claim 1, characterized in that, The ratio of the thickness of the non-metallic gear body to the thickness of the metal insert is in the range of 0.45:1 to 1:0.

45.

6. The noise-reducing worm gear according to claim 5, characterized in that, The ratio of the thickness of the non-metallic gear body to the thickness of the metal insert is 1:

1.

7. The noise-reducing worm gear according to claim 1, characterized in that, The inner circumferential surface of the non-metallic gear body is provided with an internal spline, and the outer circumferential surface of the metal insert is provided with an external spline, the external spline meshing with the internal spline.

8. The noise-reducing worm gear according to claim 1, characterized in that, The inner circumferential surface of the non-metallic gear body is also provided with a ring key, and the metal insert is provided with a ring groove, wherein the ring key is bonded to the ring groove.

9. The noise-reducing worm gear according to claim 1, characterized in that, The non-metallic gear body includes an external tooth portion, which is evenly distributed along the outer circumferential surface of the non-metallic gear body. The external tooth portion is provided with a throat circle, the diameter of which is greater than or equal to 10 mm and less than or equal to 14 mm.

10. A geared motor, characterized in that, include: The noise-reducing worm gear includes a non-metallic gear body and a metal insert embedded in the inner circumferential surface of the non-metallic gear body. The worm gear meshes with the non-metallic gear body; and The output shaft is interference-fitted with the metal insert. Wherein, the noise-reducing worm gear is the noise-reducing worm gear as described in any one of claims 1-9.

Images