Mute flywheel for bicycle

Abstract

The mute flywheel for the bicycle 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 torsional 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 effect can be achieved, and the beneficial effects of being high in transmission reliability, high in structural stability, simple in structure and long in service life are achieved.

Description

Technical Field

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

[0002] Bicycle flywheels are important transmission components in the current self-propelled motion process, and existing bicycle flywheels all use ratchet and pawl methods during use, such as disclosed in the document with patent number "CN201320422170.X"; however, due to the transmission method between the ratchet and the pawl, a large transmission noise is generated during the transmission process, and the overall mute effect is poor; and because the ratchet and the pawl need to have a certain activity space during the transmission process, the sealing of the entire internal transmission structure is poor, and external dust, rainwater, etc. can easily enter the interior to cause the ratchet or the torsion spring connected to the ratchet to rust, which in turn causes the phenomenon of jamming during the transmission process, and the reliability of the overall transmission is reduced. Therefore, the existing bicycle flywheels that use ratchet and pawl for transmission have the problems of large noise during use and low transmission reliability during use. Summary of the invention

[0003] The object of the present invention is to provide a silent flywheel for a bicycle, which 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 for a bicycle, comprising a flywheel outer shell, a flywheel inner core and a wire stopper, wherein the flywheel inner core is arranged in the flywheel outer shell, and a torsion spring is connected between the flywheel outer shell and the flywheel inner core; a mounting groove for fixing one end of the torsion spring is arranged on the surface of the flywheel inner 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 inner core and the flywheel outer shell, compared with the ratchet transmission method in the past, not only the overall structure is simpler, but also the line contact between the ratchet and the flywheel outer shell is transformed 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 sound generated by the transmission can be well avoided, and the noise is reduced; the mounting groove is used to fix one end of the torsion spring, so as to ensure the stability of the position of the torsion spring and improve the stability of the structure.

[0005] In the aforementioned silent flywheel for bicycles, a plurality of annular evenly distributed support balls 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 core, but also reduce friction and extend the service life.

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

[0007] In the aforementioned silent flywheel for bicycles, inner ring grooves for installing support balls are provided at positions on the inner side wall of the flywheel housing corresponding to the positions on both sides of the torsion spring; the setting of the inner ring grooves can fix and limit the positions of the support balls, thereby ensuring the stability of the structure.

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

[0009] In the aforementioned silent flywheel for bicycle, a plurality of evenly distributed annular grooves are provided on the end surface of the flywheel inner core away from the flywheel outer shell.

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

[0011] In the aforementioned silent flywheel for bicycle, a plurality of evenly distributed teeth are arranged on the outer side surface of the flywheel outer casing.

[0012] In the aforementioned silent flywheel for bicycle, the wire stopper (3) is provided with two symmetrically distributed auxiliary grooves.

[0013] 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 by the same rotation direction and expanded by 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 also the previous line contact between the ratchet and the flywheel outer shell is transformed 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 sound generated by the transmission can be well avoided, 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 annular evenly distributed support balls on both sides of the torsion spring, and 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; an adjustment pad is provided between the flywheel inner core and the wire stopper, and the tightness of the connection between the wire stopper and the flywheel inner core can be increased by the adjustment pad, thereby preventing external dust, liquid, etc. from entering between the flywheel inner core and the flywheel shell, thereby further extending the service life; a plurality of annular evenly distributed card grooves are provided on the inner side wall end face of the flywheel inner core, thereby facilitating the connection with external transmission components; and the auxiliary groove can facilitate the installation of the wire stopper. Therefore, the present invention can not only achieve a mute effect, but also has the advantages of high transmission reliability, high structural stability, simple structure and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a front view of the present invention;

[0016] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0017] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0018] The markings in the attached figure 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-slot, 10-tooth. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0020] Embodiment. A silent flywheel for a bicycle, 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.

[0021] 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 casing 1 is provided with inner ring grooves 7 for installing the support balls 5 at the positions corresponding to the two sides of the torsion spring 4; the end surface of the wire stopper 3 close to the flywheel outer casing 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 casing 1 is provided with a plurality of annular evenly distributed grooves 9; the inner side wall of the flywheel outer casing 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 casing 1 is provided with a plurality of evenly distributed teeth 10; the wire stopper 3 is provided with two symmetrically distributed auxiliary grooves.

[0022] Working principle: During the transmission process, the flywheel core 2 is driven to rotate by an 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 driving and sliding of the flywheel; because the flywheel core 2 and the flywheel outer shell 1 are connected together by the torsion spring 4, a surface contact is formed between the flywheel core 2 and the flywheel outer shell 1, relative to the The line contact in the form of ratchet and pawl 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 sound is produced. 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 for a bicycle, comprising a flywheel outer shell (1), a flywheel inner core (2) and a wire stopper (3), characterized in that: The flywheel inner 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 inner core (2); a mounting groove for fixing one end of the torsion spring (4) is provided on the surface of the flywheel inner core (2).

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

3. A silent flywheel for bicycle 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 for bicycle 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. A silent flywheel for bicycle 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 housing (1).

6. A silent flywheel for bicycle 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. A silent flywheel for bicycle according to claim 1, characterized in that: The inner wall of the flywheel outer casing (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 matching the mounting groove.

8. A silent flywheel for a bicycle 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 surface of the flywheel housing (1).

9. The silent flywheel for bicycle according to claim 1, characterized in that: The wire stopper (3) is provided with two symmetrically distributed auxiliary grooves.

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