A rubber synchronous belt suitable for a small space and a large speed ratio of a bicycle motorcycle

Abstract

The utility model belongs to synchronous belt technical field discloses a rubber synchronous belt suitable for bicycle motorcycle small space big speed ratio, including synchronous belt body, belt tooth and reinforcing component, synchronous belt body is used for realizing the synchronous rotation between driving wheel and driven wheel in mechanical transmission, belt tooth is used for with the tooth groove on the pulley precision meshing, realizes the synchronous transmission of driving wheel and driven wheel, reinforcing component includes protruding, auxiliary band and limit slot, the protruding is located the inboard of synchronous belt body, and with the axle of synchronous belt body as the center of circle is ring equidistant arrangement, through setting reinforcing component, the ring arrangement of protruding enhances the tensile resistance of synchronous belt inboard, the tear resistance of outer ring is promoted cooperatively by auxiliary band and fixing piece, the tooth cover of nylon characteristic of belt tooth reduces the meshing wear, the double fixed structure of auxiliary band and fixing piece avoids the falling of auxiliary reinforcing component, and the overall durability of synchronous belt is improved significantly.

Description

Technical Field

[0001] This utility model belongs to the field of synchronous belt technology, and in particular relates to a rubber synchronous belt suitable for bicycles and motorcycles with small spaces and large speed ratios. Background Technology

[0002] Synchronous toothed belts, also known as timing belts, are similar to common belt drives such as V-belts and flat belts, and are a type of flexible transmission. Synchronous toothed belts use steel wire rope or fiberglass rope as the reinforcing layer, covered with polyurethane or neoprene rubber. The inner circumference of the belt is toothed to mesh with toothed pulleys. Because the reinforcing layer deforms little under load, it maintains a constant circumferential pitch, thus preventing relative slippage between the belt and pulleys and ensuring synchronous transmission with a constant transmission ratio.

[0003] Existing synchronous belts for bicycles and motorcycles typically have a tooth spacing of 8mm or 14mm in high-speed-ratio transmission scenarios within confined spaces. When the tooth spacing is 8mm, tooth skipping is likely to occur. When the spacing is 14mm, the bending radius of the synchronous belt is larger, resulting in a larger drive pulley and affecting the usable space. Furthermore, the stress area of ​​the synchronous belt is concentrated at the connection between the meshing teeth and the belt body, as well as in the local section in contact with the pulley. At this time, the tensile stress and bending stress on the belt material are much higher than in conventional transmission scenarios, which can easily lead to local material fatigue and, in severe cases, even transmission interruption. Utility Model Content

[0004] This invention addresses the problem in existing technologies where, in high-speed-ratio transmission scenarios within confined spaces, the stress on the synchronous belt is concentrated at the connection between the meshing teeth and the belt body, as well as in the localized sections in contact with the pulleys. In these situations, the tensile and bending stresses on the belt material are significantly higher than in conventional transmission scenarios, easily leading to localized material fatigue and, in severe cases, even transmission interruption. The following technical solution is proposed:

[0005] A rubber timing belt suitable for bicycles and motorcycles with limited space and high speed ratios, comprising:

[0006] Synchronous belt body, used in mechanical transmission to achieve synchronous rotation between driving and driven pulleys;

[0007] The toothed belt is used to precisely mesh with the toothed grooves on the pulley to achieve synchronous transmission between the driving pulley and the driven pulley. The distance between two adjacent teeth is 10mm to prevent tooth skipping and slippage.

[0008] The reinforcing component includes a protrusion, an auxiliary belt, and a limiting groove. The protrusion is located on the inner side of the synchronous belt body and is arranged in a ring at equal intervals with the axis of the synchronous belt body as the center. The auxiliary belt is embedded and installed on the outer ring of the synchronous belt body. The limiting groove is correspondingly opened on the auxiliary belt and is used to circumferentially limit the auxiliary belt.

[0009] As a preferred embodiment of the above technical solution, the synchronous belt body is shaped as an arc-tooth synchronous belt with a pitch length of 50-5000mm and a width of 5-50mm.

[0010] As a preferred embodiment of the above technical solution, the toothed outer ring is provided with a wear-resistant toothed sheath, which is specifically made of nylon wear-resistant material, and the synchronous belt body is made of polyurethane or rubber material.

[0011] As a preferred embodiment of the above technical solution, the top and bottom of the auxiliary belt are provided with adhesive layers, and the free sides of the adhesive layers are respectively bonded to the inner wall of the synchronous belt body to achieve a fixed connection between the auxiliary belt and the synchronous belt body.

[0012] As a preferred embodiment of the above technical solution, the outer ring of the synchronous belt body is further provided with a fixing member, the cross-section of the fixing member is U-shaped, and the inner wall of the notch of the fixing member is attached to the outer side of the auxiliary belt.

[0013] As a preferred embodiment of the above technical solution, the top and bottom of the fastener are respectively bonded to the top and bottom of the synchronous belt body.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention effectively prevents the belt from slipping or skipping teeth during use by setting the spacing between two adjacent teeth to 10mm. Furthermore, the reinforcing components with raised rings enhance the tensile strength of the inner side of the synchronous belt, while the auxiliary belt and fixing components work together to improve the tear resistance of the outer ring. The nylon toothed sheath reduces meshing wear, and the double fixing structure of the auxiliary belt and fixing components prevents the auxiliary reinforcing components from falling off, significantly improving the overall durability of the synchronous belt and reducing the maintenance frequency. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the overall structure of a rubber synchronous belt.

[0017] Figure 2 The diagram shown is a structural schematic of the rubber synchronous belt after the auxiliary belt and fasteners have been separated.

[0018] Figure 3 The diagram shown is a cross-sectional view of the internal structure of a rubber synchronous belt;

[0019] Figure 4 What is shown is Figure 3 A schematic diagram of the structure of region A in the middle.

[0020] In the diagram: 1. Synchronous belt body; 2. Belt teeth; 21. Wear-resistant toothed sheath; 3. Protrusion; 4. Auxiliary belt; 5. Limiting groove; 6. Adhesive layer; 7. Fastener. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0022] Example 1

[0023] This invention provides a rubber timing belt suitable for bicycles and motorcycles with small spaces and high speed ratios, such as... Figures 1 to 4 As shown, the rubber synchronous belt suitable for bicycles and motorcycles with small space and high speed ratio includes a synchronous belt body 1, belt teeth 2, and reinforcing components. The synchronous belt body 1 is used to realize the synchronous rotation between the driving wheel and the driven wheel in mechanical transmission. The belt teeth 2 are used to precisely mesh with the tooth grooves on the pulley to realize the synchronous transmission between the driving wheel and the driven wheel. The reinforcing components include protrusions 3, auxiliary belts 4, and limiting grooves 5. The protrusions 3 are integrally formed inside the synchronous belt body 1 and are arranged in a ring with equal spacing around the axis of the synchronous belt body 1. The auxiliary belt 4 is embedded and installed on the outer ring of the synchronous belt body 1. The limiting grooves 5 are correspondingly opened inside the auxiliary belt 4 and are used to cooperate with the protrusions 3 to form a circumferential limit on the auxiliary belt 4.

[0024] In this embodiment, adhesive layers 6 are bonded to both the top and bottom of the auxiliary belt 4, and the free side of the adhesive layer 6 is bonded to the inner wall of the synchronous belt body 1, thereby achieving a fixed connection between the auxiliary belt 4 and the synchronous belt body 1.

[0025] Among them, the outer ring of the synchronous belt body 1 is also provided with a fastener 7. The cross-section of the fastener 7 is U-shaped, and the inner wall of the recess of the fastener 7 is attached to the outer side of the auxiliary belt 4. The top and bottom of the fastener 7 are respectively bonded to the top and bottom of the synchronous belt body 1.

[0026] By embedding the auxiliary belt 4 into the outer ring of the synchronous belt body 1 and fixing and limiting the auxiliary belt 4 with the fastener 7, the tensile strength of the synchronous belt body 1 can be improved, fatigue wear can be reduced, and the maintenance frequency can be decreased.

[0027] In use, first, the auxiliary belt 4 is embedded into the preset groove on the outer ring of the synchronous belt body 1, so that the limiting groove 5 on the auxiliary belt 4 and the corresponding protrusion 3 on the outer ring of the synchronous belt body 1 mesh with each other. The limiting groove 5 achieves circumferential limiting of the auxiliary belt 4. Next, the top and bottom adhesive layers 6 of the auxiliary belt 4 are activated (e.g., cleaning the surface and applying glue). Then, the adhesive layers 6 are attached to the inner wall of the synchronous belt body 1 from the right side, and pressure is applied to wait for the adhesive layers 6 to cure, thus completing the fixation between the auxiliary belt 4 and the synchronous belt body 1. Then, the U-shaped fastener 7 is inserted from the outer ring of the synchronous belt body 1, so that the inner wall of the notch of the fastener 7 fits against the outer side of the auxiliary belt 4, ensuring that the auxiliary belt 4 is clamped between the synchronous belt body 1 and the fastener 7. Then, the top and bottom of the fastener 7 are bonded to ensure that the auxiliary belt 4 will not loosen under high load. The annular arrangement of the protrusions 3 can enhance the tensile strength of the inner side of the synchronous belt body 1, and together with the auxiliary belt 4 and the fastener 7, can reduce the fatigue loss of the synchronous belt body 1 in bending and stretching cycles.

[0028] In this embodiment, the outer ring of the belt tooth 2 is also provided with a wear-resistant tooth coat 21, which is specifically made of nylon wear-resistant material. The synchronous belt body 1 is made of polyurethane or rubber material. The nylon wear-resistant material itself has high hardness and friction resistance. It directly covers the meshing contact surface between the belt tooth 2 and the pulley tooth groove, which can greatly reduce the friction loss when the two mesh at high frequency. It can prevent the belt tooth 2 from collapsing due to long-term wear and cracking of the tooth root, effectively extending the service life of the belt tooth 2. At the same time, the polyurethane material has a certain elasticity and can absorb the impact load at the moment of meshing between the belt tooth 2 and the pulley. Especially under high load conditions such as bicycle climbing and motorcycle rapid acceleration, it can reduce the stress concentration caused by rigid contact and reduce the risk of belt tooth 2 breaking due to fatigue.

[0029] Specifically, the synchronous belt body 1 is shaped as a circular arc tooth synchronous belt with a pitch length of 50-5000mm and a tooth spacing of 10mm between the belt teeth 2. This effectively prevents the belt from skipping teeth and slipping during use. The HTD-type circular arc tooth structure has a rounded tooth shape, which reduces stress concentration during meshing compared to trapezoidal teeth. In the small space transmission of bicycles and motorcycles, it can reduce the impact noise between the belt teeth 2 and the pulley grooves. At the same time, the 10mm tooth spacing and the 50-5000mm pitch length can adapt to the center distance requirements of the driving pulley and driven pulley in a small space, avoiding installation jamming or transmission obstruction caused by size mismatch. This significantly improves the assembly compatibility with the vehicle transmission system and effectively prevents the belt from skipping teeth and slipping during use.

[0030] Working principle: In actual use, the auxiliary belt 4 is embedded into the preset groove on the outer ring of the synchronous belt body 1, so that the limiting groove 5 on the auxiliary belt 4 and the corresponding protrusion 3 on the outer ring of the synchronous belt body 1 mesh with each other, and the circumferential limiting of the auxiliary belt 4 is achieved through the limiting groove 5.

[0031] Then, the adhesive layer 6 is bonded to the synchronous belt body 1 and the auxiliary belt 4, and pressure is applied to wait for the adhesive layer 6 to cure, thus completing the fixation between the auxiliary belt 4 and the synchronous belt body 1. Then, the fastener 7 with a concave cross-section is inserted from the outer ring of the synchronous belt body 1 to ensure that the auxiliary belt 4 is clamped between the synchronous belt body 1 and the fastener 7. Next, the top and bottom of the fastener 7 are bonded to ensure that the auxiliary belt 4 will not loosen under high load.

[0032] The annular arrangement of protrusions 3 can enhance the tensile strength of the inner side of the synchronous belt body 1. Combined with the auxiliary belt 4 and the fastener 7, it can reduce the fatigue loss of the synchronous belt body 1 in bending and stretching cycles. The wear-resistant tooth coat 21 made of nylon wear-resistant material can directly cover the meshing contact surface of the belt teeth 2 and the pulley tooth groove, which can significantly reduce the friction loss when the two mesh at high frequency and effectively extend the service life of the belt teeth 2.

[0033] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A rubber timing belt suitable for bicycles and motorcycles with small spaces and high speed ratios, characterized in that, include: Synchronous belt body (1) is used to realize synchronous rotation between the driving pulley and the driven pulley in mechanical transmission; The toothed belt (2) is used to precisely mesh with the tooth groove on the pulley to realize the synchronous transmission between the driving pulley and the driven pulley. The distance between two adjacent teeth is 10mm to prevent tooth skipping and slippage. The reinforcing component includes a protrusion (3), an auxiliary belt (4), and a limiting groove (5). The protrusion (3) is located on the inner side of the synchronous belt body (1) and is arranged in a ring at equal intervals with the axis of the synchronous belt body (1) as the center. The auxiliary belt (4) is embedded and installed on the outer ring of the synchronous belt body (1). The limiting groove (5) is correspondingly opened on the auxiliary belt (4) and is used to form a circumferential limit on the auxiliary belt (4).

2. The rubber synchronous belt suitable for bicycles and motorcycles with small spaces and large speed ratios according to claim 1, characterized in that, The synchronous belt body (1) is shaped as an arc-tooth synchronous belt with a pitch length of 50-5000mm and a width of 5-50mm.

3. The rubber synchronous belt suitable for bicycles and motorcycles with small spaces and large speed ratios according to claim 1, characterized in that, The outer ring of the toothed belt (2) is provided with a wear-resistant toothed coat (21), which is specifically made of nylon wear-resistant material, and the synchronous belt body (1) is made of polyurethane material or rubber material.

4. The rubber timing belt suitable for bicycles and motorcycles with small spaces and large speed ratios according to claim 1, characterized in that, The auxiliary belt (4) is provided with adhesive layers (6) at both the top and bottom. The free side of the adhesive layer (6) is respectively bonded to the inner wall of the synchronous belt body (1) to achieve a fixed connection between the auxiliary belt (4) and the synchronous belt body (1).

5. The rubber timing belt suitable for bicycles and motorcycles with small spaces and large speed ratios according to claim 1, characterized in that, The outer ring of the synchronous belt body (1) is also provided with a fixing member (7), the cross-section of the fixing member (7) is U-shaped, and the inner wall of the notch of the fixing member (7) is attached to the outer side of the auxiliary belt (4).

6. The rubber synchronous belt suitable for bicycles and motorcycles with small spaces and large speed ratios according to claim 5, characterized in that, The top and bottom of the fastener (7) are respectively bonded to the top and bottom of the synchronous belt body (1).

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