Gear, speed reducer and driving assembly

Abstract

The utility model discloses a gear, a speed reducer and a driving assembly, and relates to the technical field of mechanical transmission, the gear comprises an outer circular ring, an inner circular ring and a spoke; gear teeth are arranged on the outer surface of the outer circular ring; the inner ring is located on the inner side of the outer ring and is coaxial with the outer ring, and a spline is arranged on the inner surface of the inner ring; the spoke is connected between the inner surface of the outer circular ring and the outer surface of the inner circular ring, a plurality of grooves and a plurality of protrusions are arranged on the surface of the spoke, the grooves and the protrusions are distributed in a staggered mode in the circumferential direction of the outer circular ring, and supporting parts are arranged on the side walls, close to the inner circular ring, of the grooves. According to the technical scheme, the NVH level of the gear can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a gear, a reducer and a drive assembly. Background Art

[0002] The noise, vibration, harshness (NVH) performance of the gears of new energy reducers is their main competitive advantage.

[0003] In the related art, the spokes of the gear mainly include conventional I-shaped spokes and irregular shaped spokes. These two spoke structures have low supporting stiffness and obvious spoke runout modes, resulting in a low NVH level of the gear. Utility Model Content

[0004] The main purpose of the utility model is to provide a gear, a reducer and a drive assembly, aiming at improving the NVH level of the gear.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a gear, comprising:

[0006] An outer ring, wherein the outer surface of the outer ring is provided with gear teeth;

[0007] An inner ring, the inner ring is located inside the outer ring and is coaxially arranged with the outer ring, and the inner surface of the inner ring is provided with splines;

[0008] Spokes are connected between the inner surface of the outer ring and the outer surface of the inner ring. The surface of the spokes is provided with a plurality of grooves and a plurality of protrusions. The plurality of grooves and the plurality of protrusions are staggeredly distributed along the circumference of the outer ring. The grooves are provided with support portions near the side walls of the inner ring.

[0009] In one embodiment, the support portion is an inclined support portion, and the thickness of the inclined support portion in the radial direction of the inner ring gradually decreases from the groove bottom to the groove opening of the groove.

[0010] In one embodiment, the length of the spline in the axial direction of the inner ring is greater than 45 mm.

[0011] In one embodiment, the module of the spline is less than or equal to 0.8 mm.

[0012] In one embodiment, the depth of the groove is greater than 20 mm;

[0013] And / or, the cross-sectional shape of the outer contour of the groove is fan-shaped.

[0014] In one embodiment, the two opposite surfaces of the spoke are provided with a plurality of the grooves and a plurality of the protrusions, and on the same surface of the spoke, the plurality of the grooves and the plurality of the protrusions are staggeredly distributed along the circumference of the outer ring.

[0015] In one embodiment, the grooves on one surface of the spoke are arranged corresponding to the protrusions on the other surface of the spoke.

[0016] In one embodiment, the number of the grooves and the number of the protrusions on each surface of the spoke are both prime numbers.

[0017] The utility model further provides a reducer, comprising a first gear and a second gear, wherein the first gear is meshed with the second gear, and the first gear and / or the second gear are gears, and the gears include:

[0018] An outer ring, wherein the outer surface of the outer ring is provided with gear teeth;

[0019] An inner ring, the inner ring is located inside the outer ring and is coaxially arranged with the outer ring, and the inner surface of the inner ring is provided with splines;

[0020] Spokes are connected between the inner surface of the outer ring and the outer surface of the inner ring. The surface of the spokes is provided with a plurality of grooves and a plurality of protrusions. The plurality of grooves and the plurality of protrusions are staggeredly distributed along the circumference of the outer ring. The grooves are provided with support portions near the side walls of the inner ring.

[0021] The utility model also provides a driving assembly, comprising the reducer as described above.

[0022] The technical solution of the utility model is to provide a plurality of grooves and a plurality of protrusions on the surface of the spoke, and the plurality of grooves and the plurality of protrusions are staggered along the circumference of the outer ring, and a support portion is provided on the side wall of the groove close to the inner ring. When the gear runs at a high frequency, the design of the support portion can improve the support stiffness of the spoke to suppress the occurrence of the spoke runout mode, thereby effectively improving the NVH level of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a structural schematic diagram of a gear embodiment provided by the utility model.

[0025] Description of Figure Numbers:

[0026] 100, gear; 10, outer ring; 11, gear teeth; 20, inner ring; 21, spline; 30, spoke; 31, groove; 311, support portion; 32, protrusion.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0031] The utility model provides a gear 100 , aiming to improve the NVH level of the gear 100 .

[0032] See also Figure 1In one embodiment of the utility model, the gear 100 includes an outer ring 10, an inner ring 20 and a spoke 30; the outer surface of the outer ring 10 is provided with gear teeth 11; the inner ring 20 is located on the inner side of the outer ring 10 and is coaxially arranged with the outer ring 10, and the inner surface of the inner ring 20 is provided with a spline 21; the spoke 30 is connected between the inner surface of the outer ring 10 and the outer surface of the inner ring 20, and the surface of the spoke 30 is provided with a plurality of grooves 31 and a plurality of protrusions 32, and the plurality of grooves 31 and the plurality of protrusions 32 are staggered along the circumference of the outer ring 10, and a support portion 311 is provided on the side wall of the groove 31 close to the inner ring 20.

[0033] The technical solution of the utility model is to provide a plurality of grooves 31 and a plurality of protrusions 32 on the surface of the spoke 30, and the plurality of grooves 31 and the plurality of protrusions 32 are staggered along the circumference of the outer ring 10, and a support portion 311 is provided on the side wall of the groove 31 close to the inner ring 20. When the gear 100 is operated at a high frequency, the design of the support portion 311 can improve the support stiffness of the spoke 30 to suppress the occurrence of the yaw mode of the spoke 30, thereby effectively improving the NVH level of the gear 100.

[0034] In this embodiment, the gear teeth 11 on the outer surface of the outer ring 10 are used to mesh with other matching gears. In actual application, the gear teeth 11 on the outer surface of the outer ring 10 can be helical teeth, straight teeth, or bevel teeth.

[0035] In this embodiment, the splines 21 on the inner surface of the inner ring 20 are used to cooperate with the external splines on the mating shaft.

[0036] In actual application, the number of grooves 31 and protrusions 32 can be a prime number or a composite number, as long as the number of grooves 31 and protrusions 32 is the same. The same number of grooves 31 and protrusions 32 can promote the dynamic balance of the gear 100, reduce the degree of distortion, and thus improve the yaw mode of the gear 100; specifically, the number of grooves 31 and protrusions 32 can be 3, 4, 5, 6, 7, etc. Moreover, the shapes of the multiple grooves 31 can be the same or different; similarly, the shapes of the multiple protrusions 32 can be the same or different.

[0037] In actual application, the support portion 311 can be integrally formed on the side wall of the groove 31 close to the inner ring 20, or can be fixedly connected to the side wall of the groove 31 close to the inner ring 20 by bonding, screw connection, etc.

[0038] In actual application, the support portion 311 can be an inclined support portion, a straight support portion 311, a curved support portion 311, etc., as long as it can improve the support stiffness of the spoke 30 to suppress the problem of the swing mode of the spoke 30.

[0039] See also Figure 1 In one embodiment of the present invention, the support portion 311 is an inclined support portion, and the thickness of the inclined support portion in the radial direction of the inner ring 20 gradually decreases from the bottom of the groove 31 to the groove opening.

[0040] With such arrangement, the support surface of the inclined support portion can be inclined toward the notch direction of the groove 31, so that the inclined support portion can provide a supporting force toward the notch direction of the groove 31, which can better improve the support stiffness of the spoke 30 and more effectively suppress the occurrence of the yaw mode of the spoke 30.

[0041] See also Figure 1 In one embodiment of the present invention, the length of the spline 21 in the axial direction of the inner ring 20 is greater than 45 mm. Specifically, the length of the spline 21 in the axial direction of the inner ring 20 can be 46 mm, 47 mm, 50 mm, 52 mm, 55 mm, 60 mm, etc.

[0042] With such a configuration, the spline 21 can be designed into a longer spline 21 structure. In this way, when the spline 21 is matched with the external spline of the mating shaft, the matching length between the spline 21 and the external spline can be increased, which is beneficial to improve the stiffness of the connection between the gear 100 and the mating shaft, making the gear 100 more stable during operation, and can further effectively improve the problem of the yaw mode of the spoke 30.

[0043] See also Figure 1 In one embodiment of the present invention, the modulus of the spline 21 is less than or equal to 0.8 mm. Specifically, the modulus of the spline 21 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc.

[0044] In this way, when the number of teeth of the spline 21 is constant, the smaller the module of the spline 21, the smaller the diameter of the spline 21. Therefore, by designing the spline 21 as a small-module spline 21, it is also beneficial to improve the stiffness of the connection between the gear 100 and the mating shaft, making the gear 100 more stable during operation, and can further effectively improve the problem of the yaw mode of the spoke 30.

[0045] See also Figure 1 In one embodiment of the present invention, the depth of the groove 31 is greater than 20 mm. Specifically, the depth of the groove 31 can be 21 mm, 25 mm, 28 mm, 30 mm, 32 mm, etc.

[0046] In this way, by designing the groove 31 to be a groove 31 with a greater depth, the overall weight of the gear 100 can be reduced, and the problem of the yaw mode of the spoke 30 can also be improved.

[0047] See also Figure 1In one embodiment of the present invention, the cross-sectional shape of the outer contour of the groove 31 is fan-shaped.

[0048] With such an arrangement, while ensuring the rigidity of the gear 100 , the groove 31 can be opened as large as possible to reduce the overall weight of the gear 100 , thereby achieving a lightweight design of the gear 100 .

[0049] In actual application, the cross-sectional shape of the outer contour of the groove 31 may be a sector with an angle or a sector without an angle. In some embodiments, the cross-sectional shape of the outer contour may be a sector with a chamfer.

[0050] See also Figure 1 In one embodiment of the utility model, the two opposite side surfaces of the spoke 30 are provided with a plurality of grooves 31 and a plurality of protrusions 32. On the same surface of the spoke 30, the plurality of grooves 31 and the plurality of protrusions 32 are staggeredly distributed along the circumference of the outer ring 10.

[0051] In this way, by providing a plurality of grooves 31 and a plurality of protrusions 32 on the opposite side surfaces of the spoke 30, and providing a support portion 311 on the side wall of each groove 31 close to the inner ring 20, the support stiffness of the spoke 30 can be further improved, so as to effectively suppress the occurrence of the yaw mode of the spoke 30, thereby further improving the NVH level of the gear 100.

[0052] See also Figure 1 In one embodiment of the present invention, the grooves 31 on one surface of the spoke 30 are correspondingly arranged with the protrusions 32 on the other surface of the spoke 30 .

[0053] Such a configuration can prevent the groove 31 from completely penetrating the two opposite surfaces of the spoke 30 , while taking into account the dynamic balance of the gear 100 , reducing the degree of distortion, and further improving the yaw mode of the gear 100 .

[0054] See also Figure 1 In one embodiment of the present invention, the number of the grooves 31 and the number of the protrusions 32 on each surface of the spoke 30 are both prime numbers.

[0055] Such a configuration can avoid an axisymmetric layout of the gear 100 , so that the gear 100 can effectively reduce the harmonic amplitude and improve the NVH level of the gear 100 .

[0056] The utility model also proposes a reducer, which includes a first gear and a second gear, the first gear is meshed with the second gear, and the first gear and / or the second gear is the gear 100 as described above. The specific structure of the gear 100 refers to the above embodiment. Since the reducer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0057] The utility model also proposes a drive assembly, which includes the reducer. The specific structure of the reducer refers to the above embodiment. Since the drive assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the drive assembly can also include a drive source, a controller for controlling the drive source and the reducer, and the drive source is used to drive the reducer to move.

[0058] Specifically, the drive assembly can be an electric car, a sweeping robot, an electric ship, an electric motorcycle, a drone, or other equipment.

[0059] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gear, characterized in that: include: An outer ring, wherein the outer surface of the outer ring is provided with gear teeth; An inner ring, the inner ring is located inside the outer ring and is coaxially arranged with the outer ring, and the inner surface of the inner ring is provided with splines; Spokes are connected between the inner surface of the outer ring and the outer surface of the inner ring. The surface of the spokes is provided with a plurality of grooves and a plurality of protrusions. The plurality of grooves and the plurality of protrusions are staggeredly distributed along the circumference of the outer ring. The grooves are provided with support portions near the side walls of the inner ring.

2. The gear according to claim 1, characterized in that The support portion is an inclined support portion, and the thickness of the inclined support portion in the radial direction of the inner ring gradually decreases from the groove bottom to the groove opening.

3. The gear according to claim 1, characterized in that The length of the spline in the axial direction of the inner ring is greater than 45 mm.

4. The gear according to claim 1, characterized in that The module of the spline is less than or equal to 0.8 mm.

5. The gear according to any one of claims 1 to 4, characterized in that The depth of the groove is greater than 20 mm; And / or, the cross-sectional shape of the outer contour of the groove is fan-shaped.

6. The gear according to any one of claims 1 to 4, characterized in that The surfaces on both sides opposite to each other of the wheel spoke are provided with a plurality of the grooves and a plurality of the protrusions. On the same surface of the wheel spoke, the plurality of the grooves and the plurality of the protrusions are staggeredly distributed along the circumference of the outer ring.

7. The gear according to claim 6, characterized in that The grooves on one surface of the spoke are arranged correspondingly to the protrusions on the other surface of the spoke.

8. The gear according to claim 6, characterized in that The number of the grooves and the number of the protrusions on each surface of the spoke are both prime numbers.

9. A reducer, characterized in that: The invention comprises a first gear and a second gear, wherein the first gear is meshed with the second gear, and the first gear and / or the second gear is the gear according to any one of claims 1 to 8.

10. A drive assembly, characterized in that: Comprising the reducer as claimed in claim 9.

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