A silent wheel hub for an electric scooter

Abstract

This utility model relates to the technical field of electric scooter accessories, specifically a silent wheel hub for a motor-driven electric scooter. It includes a rim, with bead seats integrally formed at both ends. A hub core is located at the center of the bead seat on the front side, and a noise reduction mechanism one is located on the back of the hub core. A sound-absorbing mechanism is also arranged around the outer periphery of the bead seat. Several spokes are arranged with equal arcs between the bead seat and the hub core on the front side. The two ends of each spoke are integrally formed with the bead seat and the hub core, respectively. A noise reduction mechanism two is located on the front side of each spoke. This utility model utilizes a micro-perforated ceramic ring in the sound-absorbing mechanism in conjunction with the outer periphery of the rim to form a highly efficient micro-perforated plate sound-absorbing structure, solving the problem of aerodynamic noise radiating outwards from the tire cavity and specific frequency bands.

Description

Technical Field

[0001] This utility model relates to the technical field of electric scooter accessories, specifically a silent wheel hub for an electric motor scooter. Background Technology

[0002] Scooters are a simple means of transportation. The most common transmission methods are hub motors and belt drives. Their main power source is a lithium battery pack, and the scooter's wheel hub is one of its accessories.

[0003] For example, the hub structure of an electric scooter disclosed in authorization announcement number CN222591115U includes a cylindrical support member, the outer wall of which is embedded in the motor hub, and a motor coil assembly is assembled on the inner wall of the cylindrical support member. The beneficial effect of this utility model after adopting the above technical solution is that it can improve the support strength of the cylindrical support member for the motor hub.

[0004] Although the aforementioned patent improves the support strength of the cylindrical support for the motor hub, the electromagnetic vibration, gear meshing, and bearing operation inside the hub motor will generate noise when it is working. The vibration is transmitted and amplified outward through the hub, ultimately forming noise that can be perceived by the user. Utility Model Content

[0005] The purpose of this invention is to provide a silent wheel hub for an electric scooter with a motor, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A silent wheel hub for an electric scooter, including

[0008] The wheel rim has bead seats integrally formed at both ends. A hub core is provided at the center of the bead seat on the front side. A noise reduction mechanism is provided on the back side of the hub core. A sound absorption mechanism is also provided on the outer periphery of the bead seat.

[0009] A number of spokes are arranged with equal arc between the bead seat and the hub core on the front side. The two ends of the spokes are integrally formed with the bead seat and the hub core, respectively. A noise reduction mechanism II is provided on the front side of the spokes.

[0010] Preferably, the noise reduction mechanism includes an annular groove formed on the back of the hub core and a sound-absorbing cotton ring fixedly connected inside the annular groove, and a shaft hole is formed through the center of the hub core.

[0011] Preferably, the sound-absorbing mechanism includes an annular belt fixedly connected to the outer circumferential surface of the wheel rim, and the annular belt has a plurality of micro-holes evenly distributed on it;

[0012] Preferably, the ring is made of ceramic.

[0013] Preferably, the noise reduction mechanism 2 includes a strip groove on the front of the wheel spoke and a sound-absorbing cotton strip inside the strip groove. The wheel spoke has positioning grooves on both sides of the outer side of the strip groove. A strip cover plate is snapped onto the front of the strip groove. Positioning blocks that match the positioning groove are fixedly connected to both ends of the strip cover plate. The positioning blocks and the positioning groove are fixedly connected by bolts.

[0014] Preferably, bolt holes are also provided at the connection points between some of the spokes and the hub core.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The silent wheel hub of this electric scooter uses a ceramic ring with micropores in the sound absorption mechanism to cooperate with the outer circumference of the wheel rim to form a highly efficient micro-perforated plate sound absorption structure, which solves the problem of aerodynamic noise in specific frequency bands inside and outside the tire cavity radiating outward.

[0017] 2. The silent wheel hub of this electric scooter effectively absorbs and dissipates the mid-to-high frequency vibrations and noise directly transmitted from the motor to the wheel hub core through the cooperation of the sound-absorbing cotton ring in the noise reduction mechanism and the annular groove on the back of the wheel hub core. This solves the problem of source noise such as electromagnetic vibration being transmitted and amplified outward through the central structure of the wheel hub. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0019] Figure 2 This is a side view sectional view of the overall structure of this utility model;

[0020] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0022] In the diagram: 1. Rim; 2. Bead seat; 3. Hub core; 4. Spoke; 5. Annular groove; 6. Sound-absorbing cotton ring; 7. Shaft hole; 8. Ring belt; 9. Micro-hole; 10. Strip groove; 11. Sound-absorbing cotton strip; 12. Positioning groove; 13. Strip cover plate; 14. Positioning block; 15. Bolt hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1-4 As shown, this utility model provides a technical solution:

[0025] A silent wheel hub for an electric scooter includes a rim 1, with bead seats 2 integrally formed at both ends of the rim 1. A hub core 3 is located at the center of the bead seat 2 on the front side. A noise reduction mechanism is located on the back of the hub core 3. The noise reduction mechanism includes an annular groove 5 formed on the back of the hub core 3 and a sound-absorbing cotton ring 6 fixedly connected inside the annular groove 5. A shaft hole 7 is formed through the center of the hub core 3. A sound-absorbing mechanism is also provided on the outer periphery of the bead seat 2. The sound-absorbing mechanism includes a ring belt 8 fixedly connected to the outer periphery of the rim 1. The ring belt 8 is made of ceramic and has several spokes 4 arranged in an arc. Between the front bead seat 2 and the hub core 3, the two ends of the spoke 4 are integrally formed with the bead seat 2 and the hub core 3 respectively. The front of the spoke 4 is provided with a noise reduction mechanism 2. The noise reduction mechanism 2 includes a strip groove 10 opened on the front of the spoke 4 and a sound-absorbing cotton strip 11 set inside the strip groove 10. The spoke 4 is provided with positioning grooves 12 on both sides of the outer side of the strip groove 10. A strip cover plate 13 is snapped into the front of the strip groove 10. The two ends of the strip cover plate 13 are fixedly connected with positioning blocks 14 that match the positioning groove 12. The positioning blocks 14 and the positioning groove 12 are fixedly connected by bolts. Bolt holes 15 are also opened through the connection between several spokes 4 and hub core 3.

[0026] In this embodiment, by using the sound-absorbing cotton ring 6 in the noise reduction mechanism 1 in conjunction with the annular groove 5 on the back of the hub core 3, the mid-to-high frequency vibrations and noise directly transmitted from the motor to the hub core 3 are effectively absorbed and dissipated, thus solving the problem of source noise such as electromagnetic vibration being transmitted and amplified outward through the hub center structure.

[0027] By combining the ceramic ring belt 8 with micropores 9 in the sound absorption mechanism with the outer circumference of the rim 1, a highly efficient micro-perforated plate sound absorption structure is formed, which solves the problem of aerodynamic noise in specific frequency bands inside and outside the tire cavity radiating outward.

[0028] Working principle: When the electric scooter starts, the vibration and noise generated by the hub motor are first transmitted to the hub core 3. The sound-absorbing cotton ring 6 in the annular groove 5 on its back absorbs the mid-to-high frequency sound wave energy transmitted to it by converting it into heat energy through the porous structure. At the same time, the vibration is transmitted outward through the hub core 3 and the integrally formed spokes 4. The sound-absorbing cotton strips 11 set in the strip grooves 10 on the front of the spokes 4 further dampen and attenuate the broadband vibrations propagating along the spokes 4. The sound-absorbing cotton strips 11 are securely sealed by the bolt connection between the strip cover plate 13 and its positioning block 14 and the positioning groove 12. Meanwhile, the ceramic ring 8 fixedly connected to the outer circumference of the rim 1 uses the micropores 9 evenly distributed on its surface to form a micro-perforated plate sound-absorbing structure, forming a resonance cavity with the inner cavity of the tire, effectively eliminating specific mid-to-high frequency airflow noise that penetrates to the outside.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A silent wheel hub for an electric scooter, characterized in that: include The wheel rim (1) has a bead seat (2) integrally formed at both ends. A hub core (3) is provided at the center of the bead seat (2) on the front side. A noise reduction mechanism is provided on the back side of the hub core (3). A sound absorption mechanism is also provided on the outer periphery of the bead seat (2). A number of spokes (4) are arranged with equal arc between the bead seat (2) and the hub core (3) on the front side. The two ends of the spokes (4) are integrally formed with the bead seat (2) and the hub core (3) respectively. A noise reduction mechanism II is provided on the front side of the spokes (4).

2. The silent wheel hub of an electric scooter according to claim 1, characterized in that: The noise reduction mechanism includes an annular groove (5) on the back of the hub core (3) and a sound-absorbing cotton ring (6) fixedly connected inside the annular groove (5). The hub core (3) has a shaft hole (7) through it.

3. The silent wheel hub of an electric scooter according to claim 1, characterized in that: The sound-absorbing mechanism includes an annular belt (8) fixedly connected to the outer circumference of the rim (1), and the annular belt (8) has a number of micro-holes (9) evenly distributed on it.

4. The silent wheel hub of an electric scooter according to claim 3, characterized in that: The ring (8) is made of ceramic.

5. The silent wheel hub of an electric scooter according to claim 1, characterized in that: The noise reduction mechanism includes a strip groove (10) on the front of the spoke (4) and a sound-absorbing cotton strip (11) inside the strip groove (10). The spoke (4) is provided with positioning grooves (12) on both sides of the outer side of the strip groove (10). A strip cover plate (13) is snapped onto the front of the strip groove (10). Positioning blocks (14) matching the positioning groove (12) are fixedly connected to both ends of the strip cover plate (13). The positioning blocks (14) and the positioning groove (12) are fixedly connected by bolts.

6. The silent wheel hub of an electric scooter according to claim 1, characterized in that: A bolt hole (15) is also provided at the connection between several spokes (4) and hub core (3).

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