Belt pulley capable of preventing collision deformation

Abstract

The utility model relates to the technical field of bicycle accessories, in particular to an anti-collision deformation belt pulley which comprises a pulley body, a mounting hole and a plurality of belt teeth. Each belt tooth comprises a first axial part, a second axial part arranged in parallel with the first axial part, and a circumferential part connected with the ends, on the same side, of the first axial part and the second axial part. The first axial part, the circumferential part and the second axial part define a tooth groove with an opening in one side. The outer surfaces of the first axial part, the circumferential part and the second axial part are located on the same circumferential face with the axis of the wheel body as the center. According to the utility model, the convex edge design is abandoned, so that in the casting field, the mold construction cost caused by convex edges is reduced, and the risk of rejected products with small structures is reduced; during machining integral forming, under the same effective wheel track size, waste of machining materials can be reduced, and the overall structural strength of the product is improved; due to the high-flatness circumferential face, deformation of the protruding frame during collision is avoided, damage to the belt is reduced, and riding safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a belt pulley which is resistant to collision and deformation. Background Art

[0002] The pulley is the part of the bicycle that connects the axle to the crank. Pedaling drives the crank, which in turn drives the synchronous pulley, which ultimately drives the rear wheel through the chain and flywheel, providing power and completing the entire transmission chain of the bicycle.

[0003] At present, there are many types of non-integrated pulley related parts, the processing technology is complicated, the production cycle is long, the control is difficult, the efficiency is low, and the cost is high; and Figure 6 、 Figure 7 As shown, the ribs on the edges of the belt teeth of some pulleys are designed to be raised. When the bicycle falls, the raised portion will be deformed, causing the belt transmission to get stuck. The belt and pulley cannot engage normally, making the bicycle unusable and requiring repair or replacement of the pulley, which brings inconvenience to use and increases the cost of use. Utility Model Content

[0004] The purpose of the utility model is to provide a pulley with a simple structure, convenient processing and stable strength.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A belt pulley that prevents collision and deformation comprises a wheel body, a mounting hole is provided at the center of the wheel body, and a plurality of belt teeth are provided on the circumferential surface of the wheel body;

[0007] The belt teeth include a first axial portion, a second axial portion arranged in parallel with the first axial portion, and a circumferential portion connected to the ends of the first axial portion and the second axial portion on the same side; the first axial portion, the circumferential portion, and the second axial portion form a tooth groove with one side open; the outer surfaces of the first axial portion, the circumferential portion, and the second axial portion are located on the same circumferential surface centered on the axis of the wheel body;

[0008] Furthermore, the circumferential portion is an arc-shaped crossbeam, and a plurality of the arc-shaped crossbeams are provided. The plurality of arc-shaped crossbeams are staggered and distributed on both sides of the wheel body with the axis of the wheel body as the center, and the outer surfaces of the plurality of arc-shaped crossbeams are located on the same circumferential surface;

[0009] Furthermore, a circumferential oblique rib is provided on the inner side of the circumferential portion;

[0010] Furthermore, the first axial portion and the second axial portion are both straight beams; both ends of the first axial portion and both ends of the second axial portion are respectively connected to the ends of two arc-shaped cross beams located on both sides of the wheel body.

[0011] Furthermore, a plurality of the first axial portions and the second axial portions are distributed at equal intervals;

[0012] Furthermore, the inner sides of the first axial portion and the second axial portion are both provided with axial oblique ribs;

[0013] Furthermore, both sides of the first axial portion and the second axial portion are provided with guide arc edges at their roots; and there is a smooth transition between two adjacent guide arc edges;

[0014] Furthermore, the circumferential portion is provided with a first thickened root portion;

[0015] Furthermore, an ash discharge groove is provided in the tooth groove;

[0016] Furthermore, the wheel body is provided with a plurality of weight-reducing holes, which are distributed in a circle with the center of the wheel body as the center.

[0017] Furthermore, a protruding mounting platform is provided on one end surface of the mounting hole, and a second root portion is provided at the root of the protruding mounting platform;

[0018] Furthermore, hub mounting platforms are provided on both side end surfaces of the mounting hole, and the hub mounting platforms are provided with a third root portion;

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In actual use, the first axial portion, the circumferential portion and the second axial portion form a tooth groove with an open side, and the transmission teeth on the belt extend into the tooth groove to realize transmission between the wheels.

[0021] The outer extension of the tooth grooves is flat and located on the same circumferential surface, abandoning the convex edge design to improve the overall flatness of the wheel body, that is, it is flush on the circumferential surface centered on the axis of the wheel body. The force on the circumferential part is supported and borne by the first axial part and the second axial part, which is not easy to deform, avoiding damage to the belt caused by deformation of the wheel edge when the bicycle falls.

[0022] The utility model discloses a pulley which is resistant to collision and deformation, and abandons the convex edge design. In the casting field, it reduces the mold construction cost caused by the convex edge and reduces the risk of scrap of small structures. When the pulley is machined into one piece, it can reduce the waste of processing materials under the same effective wheelbase size and improve the overall structural strength of the product. The highly flat circumferential surface avoids the deformation of the raised frame during collision, reduces the damage to the belt, and improves riding safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a partial enlarged schematic diagram of point A of the present utility model;

[0025] Figure 3 It is an oblique side schematic diagram of the utility model;

[0026] Figure 4 It is a bottom view of the utility model;

[0027] Figure 5 This is a schematic structural diagram of a second embodiment of the present utility model;

[0028] Figure 6 A schematic diagram of a raised rib in the prior art;

[0029] Figure 7 Schematic diagram of the raised rib in the prior art. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Example 1.

[0032] refer to Figure 1-4 As shown, a belt pulley that prevents collision and deformation includes a wheel body 1, a mounting hole 3 is provided in the center of the wheel body 1, and a plurality of belt teeth 2 are provided on the circumferential surface of the wheel body 1;

[0033] The belt teeth 2 include a first axial portion 21, a second axial portion 22 arranged parallel to the first axial portion 21, and a circumferential portion 23 connected to the ends on the same side of the first axial portion 21 and the second axial portion 22; the first axial portion 21, the circumferential portion 23 and the second axial portion 22 form a tooth groove 24 with one side open; the outer surfaces of the first axial portion 21, the circumferential portion 23 and the second axial portion 22 are all on the same circumferential surface with the center of the wheel body 1 as the center of the circle.

[0034] In actual use of the present invention, the first axial portion 21, the circumferential portion 23 and the second axial portion 22 form a tooth groove 24 with one side open, and the transmission teeth on the belt extend into the tooth groove 24 to achieve transmission between the wheels.

[0035] In this example, the outer extension of the tooth grooves 24 is flat and located on the same circumferential surface, abandoning the convex edge design to improve the overall flatness of the wheel body 1, that is, it is flush on the circumferential surface centered on the axis of the wheel body 1. The force on the circumferential part 23 is supported and borne by the first axial part 21 and the second axial part 22, and it is not easy to deform, thereby avoiding damage to the belt caused by deformation of the edge of the wheel body 1 when the bicycle falls.

[0036] This anti-collision and deformation pulley abandons the convex edge design. In the casting field, it reduces the mold construction cost caused by the convex edge and reduces the risk of scrap of small structures. When machined into one piece, it can reduce processing material waste and improve the overall structural strength of the product under the same effective wheelbase size. The highly flat circumferential surface avoids the deformation of the raised frame during collision, reduces belt damage, and improves riding safety.

[0037] In this embodiment, the circumferential portion 23 is an arc-shaped beam, and there are multiple arc-shaped beams. The multiple arc-shaped beams are staggered and distributed on both sides of the wheel body 1 with the axis of the wheel body 1 as the center, and the outer surfaces of the multiple arc-shaped beams are located on the same circumferential surface.

[0038] In this embodiment, a circumferential oblique rib 28 is provided on the inner side of the circumferential portion 23 ; the circumferential oblique rib 28 is used to automatically correct the belt when the pulleys are not on a center line, so as to prevent the belt from slipping out.

[0039] In this embodiment, the first axial portion (21) and the second axial portion (22) are both straight beams, and both ends of the first axial portion 21 and the second axial portion 22 are respectively connected to the ends of two arc-shaped cross beams located on both sides of the wheel body 1; a plurality of the first axial portions 21 and the second axial portions 22 are distributed at equal intervals.

[0040] Furthermore, an axial oblique rib 29 is provided on the inner side of the first axial portion 21 and the second axial portion 22; the axial oblique rib 29 is used to fit tightly with the belt teeth to ensure that the belt can smoothly cut into the tooth groove 24, thereby improving the stability of the belt during transmission.

[0041] In this embodiment, the roots of both sides of the first axial portion 21 and the second axial portion 22 are provided with guide arc edges 26; there is a smooth transition between the two adjacent guide arc edges 26; the deformation of the first axial portion 21 and the second axial portion 22 caused by longitudinal collision can be avoided; the lateral structural strength of the tooth groove 24 is improved, and when a serious collision occurs, the single deformed first axial portion 21 or second axial portion can be directly and completely destroyed, or the function can be taken over by the first axial portion 21 or second axial portion adjacent to the destroyed portion.

[0042] In this embodiment, the circumferential portion 23 is provided with a first thickened root 25; the side view of the first thickened root 25 is triangular, and the triangular first thickened root 25 ensures the structural strength of the circumferential portion 23, avoids deformation caused by lateral collisions, and improves the strength of the lateral structure of the tooth groove 24. When a serious collision occurs, the single deformed circumferential portion 23 can be completely destroyed.

[0043] In this embodiment, a dust discharge groove 27 is also provided in the tooth groove 24, which can effectively discharge dust and gravel stuck on the belt or flying during riding; during the rotation of the wheel body 1, the dust and gravel can be quickly discharged through the dust discharge groove 27 to prevent the dust and gravel from wearing the belt and the tooth groove 24.

[0044] In this embodiment, the wheel body 1 is further provided with a plurality of weight-reducing holes 11, which are distributed in a circle with the center of the wheel body 1 as the center of the circle; the weight-reducing holes 11 are convenient for reducing the weight of the wheel body 1, reducing the burden of riding without affecting the structural strength.

[0045] In this embodiment, a protruding mounting platform 31 is provided on one end face of the mounting hole 3, and the protruding mounting platform 31 is provided with a second root portion 32; the single-sided protruding mounting platform 31, combined with the second root portion 32 with an inwardly concave rounded corner, facilitates the assembly of the wheel body 1 used for transmission, avoids wear caused by direct contact between the end face of the wheel body 1 and the mounting surface, and improves the overall service life and structural strength of the wheel body 1.

[0046] Example 2.

[0047] refer to Figure 5 The difference between this second embodiment and the first embodiment is:

[0048] The two side end surfaces of the mounting hole 3 are raised with a hub mounting platform 33, and the hub mounting platform 33 is provided with a third root portion 34; the hub mounting platforms 33 are raised on both sides, and combined with the third root portion 32 with an inwardly concave rounded corner, it is convenient to install the wheel body 1 serving as the rear flywheel in the bicycle hub, thereby improving the installation and assembly efficiency.

[0049] In this embodiment, the remaining technical features are consistent with those of the first embodiment.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the scope defined by the spirit of the present invention.

Claims

1. A pulley that prevents collision and deformation, characterized in that: It comprises a wheel body (1), a mounting hole (3) is provided at the center of the wheel body (1), and a plurality of belt teeth (2) are provided on the circumference of the wheel body (1); The belt teeth (2) include a first axial portion (21), a second axial portion (22) arranged in parallel with the first axial portion (21), and a circumferential portion (23) connected to the ends on the same side of the first axial portion (21) and the second axial portion (22); the first axial portion (21), the circumferential portion (23) and the second axial portion (22) form a tooth groove (24) with an open side; the outer surfaces of the first axial portion (21), the circumferential portion (23) and the second axial portion (22) are located on the same circumferential surface centered on the axis of the wheel body (1).

2. The anti-collision and deformation pulley according to claim 1, characterized in that: The circumferential portion (23) is an arc-shaped crossbeam, and a plurality of the arc-shaped crossbeams are provided. The plurality of arc-shaped crossbeams are staggered and distributed on both sides of the wheel body (1) with the axis of the wheel body (1) as the center, and the outer surfaces of the plurality of arc-shaped crossbeams are located on the same circumferential surface.

3. The anti-collision and deformation pulley according to claim 1, characterized in that: A circumferential oblique rib (28) is provided on the inner side of the circumferential portion (23). The circumferential oblique rib (28) is used to automatically correct the belt when the pulleys are not on a central line.

4. The anti-collision and deformation pulley according to claim 1, characterized in that: The first axial portion (21) and the second axial portion (22) are both straight beams. Both ends of the first axial portion (21) and the second axial portion (22) are respectively connected to the ends of two arc-shaped cross beams located on both sides of the wheel body (1); a plurality of the first axial portions (21) and the second axial portions (22) are distributed at equal intervals.

5. The anti-collision and deformation pulley according to claim 4, characterized in that: Axial oblique ribs (29) are provided on the inner sides of the first axial portion (21) and the second axial portion (22), and the axial oblique ribs (29) are used to fit tightly with the belt teeth.

6. The anti-collision and deformation pulley according to claim 1, characterized in that: The roots on both sides of the first axial portion (21) and the second axial portion (22) are both provided with guide arc edges (26); and there is a smooth transition between two adjacent guide arc edges (26).

7. The anti-collision and deformation pulley according to claim 1, characterized in that: The circumferential portion (23) is provided with a first thickened root portion (25).

8. The anti-collision and deformation pulley according to claim 1, characterized in that: The wheel body (1) is also provided with a plurality of weight-reducing holes (11).

9. The anti-collision and deformation pulley according to claim 1, characterized in that: One end surface of the mounting hole (3) is convexly provided with a relief mounting platform (31).

10. The anti-collision and deformation pulley according to claim 1, characterized in that: Hub mounting platforms (33) are provided on both side end surfaces of the mounting hole (3).

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