Synchronous belt with good wear resistance

Abstract

This utility model discloses a timing belt with good wear resistance, comprising a toothed unit, a back unit, and a cord unit. The toothed unit includes a tooth body, a composite toothed cloth layer, and a single toothed cloth layer. The composite toothed cloth layer comprises a polytetrafluoroethylene (PTFE) layer and a nylon layer, with surface protrusions of the PTFE layer capable of filling the nylon layer. The single toothed layer is connected to both ends of the composite toothed cloth layer. The toothed unit includes a meshing portion and a gap portion. The perimeters of the meshing portion and the gap portion in the direction perpendicular to the width of the timing belt are L1 and L2, respectively, with the ratio of L1 to L2 between 0.95 and 1.05. The thickness of the toothed unit is D1, and the overall thickness of the timing belt is D2, with the ratio of D1 to D2 between 0.55 and 0.7. This utility model has at least the following advantages: by utilizing the embedded design of the toothed unit and the dimensional parameter design between the meshing portion and the gap portion, the timing belt can achieve good wear resistance.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a synchronous belt with good wear resistance. Background Technology

[0002] In recent years, due to the quietness, comfort, maintenance-free operation, attractive appearance, and long lifespan of belt-driven cruisers, the domestic market for these vehicles has developed rapidly, with a market penetration rate of 70% to 80% of the total cruiser market. However, unlike traditional automotive and indoor industrial applications, personal mobility timing belts (mainly used in cruisers) often encounter harsh outdoor conditions such as rain, mud, and gravel. Under these conditions, the lifespan of traditional timing belts drops sharply, reaching only about 15,000 kilometers, far below the demands of end consumers. Therefore, there is a need to develop a personal mobility timing belt with superior wear resistance. Given these shortcomings, improving the wear resistance and stability of timing belts is a pressing technical problem that needs to be solved. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a timing belt with good wear resistance. By utilizing the embedded design of the tooth unit and the dimensional parameter design between the meshing part and the gap part, the timing belt can achieve the advantage of good wear resistance.

[0004] This utility model is achieved through the following technical solution:

[0005] A timing belt with good wear resistance includes a toothed unit, a back unit, and a cord unit, wherein the cord unit is pressed into the back unit;

[0006] The tooth unit includes a tooth body, a composite tooth cloth layer disposed on the outside of the tooth body, and a single tooth cloth layer; the composite tooth cloth layer includes a polytetrafluoroethylene layer and a nylon layer bonded together by a penetration process, the surface protrusions of the polytetrafluoroethylene layer can fill into the nylon layer, and the two ends of the composite tooth cloth layer are connected to the single tooth layer.

[0007] The toothed unit includes a meshing part and a gap part. The meshing part includes a corresponding composite toothed cloth layer, and the gap part includes a corresponding single toothed layer.

[0008] The meshing part has a cross-sectional perimeter of L1 in the direction perpendicular to the width of the synchronous belt, and the gap part has a cross-sectional perimeter of L2 in the direction perpendicular to the width of the synchronous belt. The ratio between L1 and L2 is between 0.95 and 1.05.

[0009] The toothed unit has a thickness D1 in the direction perpendicular to the width of the synchronous belt, and the overall thickness of the synchronous belt is D2. The ratio between D1 and D2 is between 0.55 and 0.7.

[0010] Furthermore, the surface of the nylon layer is recessed to form multiple permeation grooves, and a portion of the structure of the polytetrafluoroethylene layer is capable of filling the permeation grooves.

[0011] Furthermore, the number of permeation cells is set to multiple, and the multiple permeation cells are distributed in a rectangular array.

[0012] Furthermore, the cross-section of the permeation groove in the direction of the protrusion filling perpendicular to the surface of the polytetrafluoroethylene layer is one or more of a circle or a rectangle.

[0013] Furthermore, the cord unit includes a plurality of carbon fiber tensile cords, each of which has a diameter between 0.8 and 2.0 mm and / or a twist between 30 tpm and 80 tpm.

[0014] Furthermore, the outer wall of the cord unit is covered with an adhesive unit.

[0015] Furthermore, the back unit also includes a back layer, which is attached to the outer end face.

[0016] Furthermore, the cord unit extends along the bandwidth direction of the synchronous belt, and the cord unit is disposed near the root of the tooth body.

[0017] Compared to existing technologies, the advantages of this invention are as follows: Utilizing a composite tooth layer embedded design, the PTFE layer possesses good wear resistance, while the nylon layer has sufficient strength. The combination of the infiltration process and the embedded structure ensures that the synchronous belt can effectively transmit power while also exhibiting good wear resistance, effectively extending its service life. Furthermore, by utilizing the design of the cross-sectional dimensions between the meshing tooth action part and the clearance part, wear on the root of the synchronous belt teeth during transmission can be effectively reduced, lowering the risk of failure and thus effectively extending its service life. Finally, by utilizing the ratio of the tooth unit thickness to the overall thickness of the synchronous belt, it can withstand greater loads during motion, ensuring its stability during movement. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a wear-resistant synchronous belt in an embodiment of this utility model;

[0019] Figure 2 This is a partial view of the toothed unit of the timing belt with good wear resistance in an embodiment of this utility model;

[0020] Figure 3This is a partial view of the permeation groove of the wear-resistant synchronous belt in an embodiment of this utility model.

[0021] Reference numerals: 1. Tooth unit; 2. Back unit; 3. Cord unit; 11. Tooth body; 12. Single tooth cloth layer; 13. Polytetrafluoroethylene layer; 14. Nylon layer; 15. Meshing part; 16. Gap part; 17. Permeation groove; 21. Back layer; 31. Rubber unit. Detailed Implementation

[0022] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] like Figures 1 to 3 As shown, this utility model discloses a timing belt with good wear resistance, including a toothed unit 1, a back unit 2, and a rope unit 3. The rope unit 3 is pressed into the back unit 2, and the resulting timing belt can be used in the meshing of the transmission structure of a cruiser.

[0024] In this embodiment, the tooth unit 1 includes a tooth body 11, a composite tooth cloth layer disposed on the outside of the tooth body 11, and a single tooth cloth layer 12. The two ends of the composite tooth cloth layer are connected to single tooth layers, and the continuous, intermittent connection forms a synchronous belt that meets the requirements. It is worth noting that the composite tooth cloth layer includes a polytetrafluoroethylene (PTFE) layer 13 and a nylon layer 14 bonded together using an infiltration process. The surface protrusions of the PTFE layer 13 can fill the nylon layer 14. In a preferred embodiment, the surface of the nylon layer 14 has recesses forming multiple infiltration grooves 17, and a portion of the PTFE layer 13, consisting of surface protrusions, can fill these grooves. This infiltration process bonding design, along with the embedded design of the composite tooth layer, ensures that the PTFE layer 13 has good wear resistance, while the nylon layer 14 has sufficient strength. The combination of the infiltration process and the embedded structure ensures that the synchronous belt can effectively transmit power while also possessing good wear resistance, effectively extending the service life of the synchronous belt.

[0025] In this embodiment, multiple permeation grooves 17 are provided, and the multiple permeation grooves 17 are distributed in a rectangular array. The purpose of this arrangement is to ensure that the wear resistance and strength of the composite toothed cloth layer are approximately the same throughout, thereby ensuring stable wear resistance and strength support during meshing transmission.

[0026] Furthermore, the cross-section of the permeation groove 17 in the direction of the protrusion filling perpendicular to the surface of the polytetrafluoroethylene layer 13 is one or more of a circle and a rectangle. In this embodiment, the cross-section of the permeation groove 17 is circular.

[0027] In this embodiment, the tooth unit 1 includes a meshing part 15 and a gap part 16. The meshing part 15 includes a corresponding composite tooth cloth layer, and the gap part 16 includes a corresponding single tooth layer. It is worth noting that the perimeter of the cross-section of the meshing part 15 in the direction perpendicular to the width of the synchronous belt is L1, and the perimeter of the cross-section of the gap part 16 in the direction perpendicular to the width of the synchronous belt is L2. The ratio between L1 and L2 is between 0.95 and 1.05. In harsh outdoor operating environments, mud, sand, and gravel can adhere to the synchronous belt, primarily damaging the tooth root, i.e., the location corresponding to the gap part 16. Therefore, this application incorporates the aforementioned gap part 16 to reduce wear and ensure the dimensions of the meshing part 15, preventing tooth skipping during meshing and ensuring the stability of the synchronous belt drive.

[0028] In this embodiment, the thickness of the toothed unit 1 in the direction perpendicular to the width of the synchronous belt is D1, and the overall thickness of the synchronous belt is D2. The ratio between D1 and D2 is between 0.55 and 0.7. By utilizing the ratio of the thickness of the toothed unit 1 to the overall thickness of the synchronous belt, the toothed unit 1 can resist forces more stably during motion and can withstand greater load forces, thereby ensuring its stability during motion.

[0029] In this embodiment, the cord unit 3 extends along the bandwidth of the synchronous belt and is positioned near the root of the tooth body 11. This arrangement is intended to ensure that the tooth unit 1 can withstand greater loads and maintain more stable resistance during motion.

[0030] It is also worth noting that the cord unit 3 comprises multiple carbon fiber tensile cords, each with a diameter between 0.8 and 2.0 mm and / or a twist between 30 tpm and 80 tpm. The outer wall of the cord unit 3 is covered with a rubber compound unit 31. The rubber compound unit 31 is composed of at least two rubber compounds selected from nitrile rubber, hydrogenated nitrile rubber, ethylene propylene rubber, chloroprene rubber, and natural rubber. The combination of the cord unit 3 and the rubber compound unit 31, through control of the wire diameter and twist, enables the synchronous belt to exhibit low elongation under high load.

[0031] In this embodiment, the back unit 2 further includes a back layer 21, which is fitted onto the outer end face. The back layer 21 may be made of nylon canvas and is intended to provide the necessary strength support for the timing belt.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A synchronous belt with good wear resistance, characterized in that, It includes a toothed unit, a back unit, and a cord unit, wherein the cord unit is pressed into the back unit; The tooth unit includes a tooth body, a composite tooth cloth layer disposed on the outside of the tooth body, and a single tooth cloth layer; the composite tooth cloth layer includes a polytetrafluoroethylene layer and a nylon layer bonded together by a penetration process, the surface protrusions of the polytetrafluoroethylene layer can fill into the nylon layer, and the two ends of the composite tooth cloth layer are connected to a single tooth layer. The toothed unit includes a meshing part and a gap part. The meshing part includes a corresponding composite toothed cloth layer, and the gap part includes a corresponding single toothed layer. The meshing part has a cross-sectional perimeter of L1 in the direction perpendicular to the width of the synchronous belt, and the gap part has a cross-sectional perimeter of L2 in the direction perpendicular to the width of the synchronous belt. The ratio between L1 and L2 is between 0.95 and 1.

05. The toothed unit has a thickness D1 in the direction perpendicular to the width of the synchronous belt, and the overall thickness of the synchronous belt is D2. The ratio between D1 and D2 is between 0.55 and 0.

7.

2. The wear-resistant synchronous belt according to claim 1, characterized in that, The surface of the nylon layer has recesses forming multiple permeation grooves, and a portion of the structure of the polytetrafluoroethylene layer can fill these permeation grooves.

3. The wear-resistant synchronous belt according to claim 2, characterized in that, The number of permeation cells is set to multiple, and the multiple permeation cells are distributed in a rectangular array.

4. The wear-resistant synchronous belt according to claim 3, characterized in that, The cross-section of the permeation groove in the direction of the protrusion filling perpendicular to the surface of the polytetrafluoroethylene layer is one or more of a circle or a rectangle.

5. The wear-resistant synchronous belt according to claim 1, characterized in that, The cord unit comprises multiple carbon fiber tensile cords, each of which has a diameter between 0.8 and 2.0 mm and / or a twist between 30 tpm and 80 tpm.

6. The wear-resistant synchronous belt according to claim 5, characterized in that, The outer wall of the cord unit is covered with a rubber unit.

7. The wear-resistant synchronous belt according to claim 1, characterized in that, The back unit also includes a back layer, which is attached to the outer end face.

8. The wear-resistant synchronous belt according to claim 1, characterized in that, The cord unit extends along the bandwidth direction of the synchronous belt and is disposed near the root of the tooth body.

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