Mute flywheel

Abstract

The utility model discloses a mute flywheel which comprises a flywheel outer sleeve (1), a flywheel inner core (2) and a screw baffle (3), the flywheel inner core (2) is arranged in the flywheel outer sleeve (1), and a torsion spring (4) is connected between the flywheel outer sleeve (1) and the flywheel inner core (2). And a mounting groove for fixing one end part of the torsion spring (4) is formed in the surface of the flywheel inner core (2). The silence device not only can play a silence effect, but also has the advantages of high transmission reliability, high structural stability, simple structure and long service life.

Description

Technical Field

[0001] The utility model relates to a flywheel for a bicycle, in particular to a silent flywheel. Background Art

[0002] Bicycle flywheels are important transmission components in modern self-propelled vehicles. Existing bicycle flywheels typically utilize a ratchet and pawl system, as disclosed in patent document CN201320422170.X. However, the transmission method between the ratchet and pawl produces a loud transmission noise during transmission, resulting in a poor overall quieting effect. Furthermore, because the ratchet and pawl require a certain amount of free space for the pawl to move, the sealing of the entire internal transmission structure is poor. External dust, rainwater, and the like can easily enter the interior, causing the pawl or the torsion spring connected to the pawl to rust, leading to jamming during transmission and reduced overall transmission reliability. Consequently, existing bicycle flywheels utilizing ratchet and pawl transmission suffer from loud noise and low transmission reliability. Summary of the Invention

[0003] The purpose of the utility model is to provide a silent flywheel. The utility model not only has a silent effect but also has the advantage of high transmission reliability.

[0004] The technical solution of the present invention is as follows: a silent flywheel, comprising a flywheel outer shell, a flywheel core and a wire stopper, the flywheel core being arranged in the flywheel outer shell, and a torsion spring being connected between the flywheel outer shell and the flywheel core; a mounting groove for fixing one end of the torsion spring is provided on the surface of the flywheel core; the torsion spring is tightened by being subjected to force in the same rotation direction and stretched by being subjected to force in the opposite rotation direction, so as to transmit the power between the flywheel core and the flywheel outer shell. Compared with the previous ratchet transmission method, not only is the overall structure simpler, but the line contact between the ratchet and the flywheel outer shell is converted into surface contact, the force is more uniform, and the stability and accessibility of the transmission are improved; at the same time, because the torsion spring is close to the flywheel outer shell, the transmission can be smoother, and compared with the previous ratchet transmission method, the noise generated by the transmission can be well avoided, thereby achieving a silent effect; the mounting groove is used to fix one end of the torsion spring, thereby ensuring the stability of the torsion spring position and further improving the stability of the structure.

[0005] In the aforementioned silent flywheel, a plurality of annular support balls evenly distributed are provided on both sides of the torsion spring; the rolling of the support balls can not only ensure the stability of the transmission between the flywheel shell and the flywheel inner core, but also reduce the friction generated by the transmission between the flywheel shell and the flywheel inner core, thereby extending the service life.

[0006] In the aforementioned silent flywheel, a connecting end that cooperates with the wire stopper is provided on the end of the flywheel core close to the wire stopper, and an adjustment pad is sleeved on the connecting end; the adjustment pad can increase the tightness of the connection between the wire stopper and the flywheel core, thereby preventing external dust, liquid, etc. from entering between the flywheel core and the flywheel shell, further extending the service life.

[0007] In the aforementioned silent flywheel, inner ring grooves for mounting supporting balls are provided on the inner side wall of the flywheel outer casing at positions corresponding to both sides of the torsion spring.

[0008] In the aforementioned silent flywheel, an outer ring groove for passing the supporting balls is provided on the end surface of the wire stop close to the flywheel outer shell.

[0009] In the aforementioned silent flywheel, a plurality of annular evenly distributed grooves are provided on the end face of the flywheel core away from the flywheel outer shell; by providing a plurality of annular evenly distributed grooves on the end face of the inner wall of the flywheel core, it is convenient to connect with external transmission components.

[0010] In the aforementioned silent flywheel, a mounting groove for fixing a torsion spring is also provided on the inner side wall of the flywheel outer shell; and both ends of the torsion spring are provided with fixing heads that match the mounting groove.

[0011] In the aforementioned silent flywheel, a plurality of evenly distributed teeth are provided on the outer surface of the flywheel housing.

[0012] Compared with the prior art, the present invention improves the existing bicycle flywheel by arranging a torsion spring between the flywheel outer shell and the flywheel inner core, and utilizing the principle that the torsion spring is tightened when subjected to force in the same rotation direction and is stretched when subjected to force in the opposite rotation direction, so as to transmit the power between the flywheel inner core and the flywheel outer shell. Compared with the previous ratchet transmission method, not only is the overall structure simpler, but the previous line contact between the ratchet and the flywheel outer shell is converted into surface contact, the force is more uniform, and the stability and accessibility of the transmission are improved; at the same time, because the torsion spring is in close contact with the flywheel outer shell, the transmission can be smoother, and compared with the previous ratchet transmission method, the noise generated by the transmission can be well avoided, thereby achieving a silent effect; by arranging an installation groove on the inner surface of the flywheel inner core and utilizing the installation groove to fix one end of the torsion spring, the stability of the position of the torsion spring is ensured, and the stability of the structure is further improved. In addition, the present invention also provides a plurality of evenly distributed annular support balls on both sides of the torsion spring. The rolling of the support balls not only ensures the stability of the transmission between the flywheel shell and the flywheel inner core, but also reduces the friction generated by the transmission between the flywheel shell and the flywheel inner core, thereby extending the service life. An adjustment pad is provided between the flywheel inner core and the wire stop. The adjustment pad can increase the tightness of the connection between the wire stop and the flywheel inner core, preventing external dust, liquid, etc. from entering between the flywheel inner core and the flywheel shell, further extending the service life. A plurality of evenly distributed annular slots are provided on the inner side wall end surface of the flywheel inner core to facilitate connection with external transmission components. Therefore, the present invention not only achieves a silent effect, but also has the advantages of high transmission reliability, high structural stability, simple structure and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is the main view of the utility model;

[0015] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0016] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0017] The marks in the accompanying drawings are: 1-flywheel outer shell, 2-flywheel inner core, 3-wire stopper, 4-torsion spring, 5-support ball, 6-adjustment pad, 7-inner ring groove, 8-outer ring groove, 9-clip groove, 10-tooth. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment. A silent flywheel, comprising: Figures 1 to 4 As shown, it includes a flywheel outer shell 1, a flywheel core 2 and a wire stopper 3, and is characterized in that: the flywheel core 2 is arranged in the flywheel outer shell 1, and a torsion spring 4 is connected between the flywheel outer shell 1 and the flywheel core 2; a mounting groove for fixing one end of the torsion spring 4 is provided on the surface of the flywheel core 2.

[0020] Both sides of the torsion spring 4 are provided with a plurality of annular evenly distributed support balls 5; the end of the flywheel core 2 close to the wire stopper 3 is provided with a connecting end that cooperates with the wire stopper 3, and an adjustment pad 6 is sleeved on the connecting end; the inner side wall of the flywheel outer shell 1 is provided with an inner ring groove 7 for installing the support balls 5 at the positions on both sides of the torsion spring 4; the end surface of the wire stopper 3 close to the flywheel outer shell 1 is provided with an outer ring groove 8 for passing the support balls 5; the end surface of the flywheel core 2 away from the flywheel outer shell 1 is provided with a plurality of annular evenly distributed card grooves 9; the inner side wall of the flywheel outer shell 1 is also provided with a mounting groove for fixing the torsion spring 4; both ends of the torsion spring 4 are provided with a fixing head that cooperates with the mounting groove; the outer side surface of the flywheel outer shell 1 is provided with a plurality of evenly distributed teeth 10.

[0021] Working principle: During the transmission process, the flywheel core 2 is driven to rotate by the external transmission member, and the flywheel core 2 is stably connected to the torsion spring 4 through the installation groove, so that the torsion spring 4 rotates synchronously. When the torsion spring 4 is subjected to force in the same direction of rotation, it will produce a tightening effect, and when it is subjected to force in the opposite direction of rotation, it will produce a stretching effect, so that the torsion spring 4 can drive the flywheel outer shell 1 to rotate, so as to realize the drive and sliding of the flywheel; because the flywheel core 2 and the flywheel outer shell 1 are connected together by the torsion spring 4, the flywheel core 2 and the flywheel outer shell 1 form a surface contact, relative to the The line contact using the ratchet and pawl method makes the force between the flywheel core 2 and the flywheel outer shell 1 more uniform and the transmission more reliable; and because the torsion spring 4 is tightly attached to the inner side of the flywheel outer shell 1, the transmission is smoother and no noise is generated. Compared with the previous method of filling with butter to block the propagation of sound, the generation of sound is avoided from the root, and true silence is achieved; at the same time, the overall internal structure is more convenient to produce than the ratchet and pawl mechanism, and does not require the use of corresponding molds, thereby reducing production costs.

Claims

1. A silent flywheel, comprising a flywheel outer shell (1), a flywheel inner core (2) and a wire stopper (3), characterized in that: The flywheel core (2) is arranged in the flywheel outer shell (1), and a torsion spring (4) is connected between the flywheel outer shell (1) and the flywheel core (2); a mounting groove for fixing one end of the torsion spring (4) is provided on the surface of the flywheel core (2).

2. A silent flywheel according to claim 1, characterized in that: A plurality of annular supporting balls (5) evenly distributed are provided on both sides of the torsion spring (4).

3. The silent flywheel according to claim 1, characterized in that: The end of the flywheel inner core (2) close to the wire stopper (3) is provided with a connecting end matched with the wire stopper (3), and an adjusting pad (6) is sleeved on the connecting end.

4. A silent flywheel according to claim 2, characterized in that: Inner ring grooves (7) for mounting supporting balls (5) are provided on the inner side wall of the flywheel outer casing (1) at positions corresponding to both sides of the torsion spring (4).

5. The silent flywheel according to claim 2, characterized in that: An outer ring groove (8) for passing the supporting ball (5) is provided on the end surface of the wire stopper (3) close to the flywheel outer shell (1).

6. The silent flywheel according to claim 1, characterized in that: A plurality of evenly distributed annular grooves (9) are provided on the end surface of the flywheel inner core (2) away from the flywheel outer shell (1).

7. The silent flywheel according to claim 1, characterized in that: The inner side wall of the flywheel outer shell (1) is also provided with a mounting groove for fixing the torsion spring (4); both ends of the torsion spring (4) are provided with fixing heads that match the mounting groove.

8. A silent flywheel according to any one of claims 1 to 7, characterized in that: A plurality of evenly distributed teeth (10) are provided on the outer side of the flywheel outer casing (1).

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