Transmission device and two-wheeled vehicle

Abstract

According to the transmission device and the two-wheeled vehicle, a first belt wheel is matched with a belt, during meshing transmission, the top face part of a belt tooth abuts against the bottom face of a first tooth groove, then the first belt wheel supports part of the belt tooth, and the abutting position is a supporting area and can resist tensile force and pre-tightening force; stress areas under the action of pulling force and pre-tightening force are formed on the two sides of the abutting position, and two-side torque with the supporting area as the center is formed; when the external interference force acts on the belt, the torque on one side of the external interference force breaks the torque balance, the position of the supporting area is moved, the width of the stress area on the side where the external interference force participates is increased, the width of the stress area on the other side is reduced, and the offset is continuously increased until the offset does not change any more to achieve the torque balance on the two sides under the participation of the external interference force; and when the external interference force is removed, the moment of the side where the external interference force participates originally is reduced, the moment balance on the two sides is broken again, the position of the supporting area returns to the original position, and then the self-centering effect of belt transmission is achieved.

Description

Technical Field

[0001] The present invention relates to the field of transmission technology, and more particularly to a transmission device and a two-wheeled vehicle. Background Art

[0002] Pulley and belt drive are common forms in mechanical transmission and are widely used in various industrial and civil equipment.

[0003] The meshing drive of a toothed belt transmits power through the meshing force between the belt and the pulley. Its transmission structure is relatively simple, mainly composed of a pulley and a transmission belt, which is convenient for installation and maintenance.

[0004] In the transmission system of a vehicle, belt drive can buffer load impact, run smoothly, and produce low noise, so it has gradually attracted attention. Especially, the transmission systems of high-end two-wheeled bicycles or motorcycles pursue more silent, maintenance-free, and durable performance.

[0005] However, belt deviation is a common problem in belt drive systems. During the movement of the transmission belt, due to various factors, it may deviate from the center position of the pulley, resulting in uneven contact between the belt and the pulley, aggravating local wear, and shortening the service life.

[0006] In related technologies, to solve the problem of belt deviation, baffles are often provided on both sides of the pulley to restrict the movement of the belt by blocking. This method causes the end of the belt to rub violently against the baffle, resulting in damage to the belt and the pulley.

[0007] Therefore, it is necessary to develop a new type of pulley and transmission device to improve some of the above problems existing in related technologies. Summary of the Invention

[0008] The purpose of the present invention is to provide a transmission device and a two-wheeled vehicle, which can keep the belt in the target position during transmission, and can automatically return to the original position even if briefly affected by an external lateral force.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A transmission device includes a first pulley and a second pulley connected by a toothed belt. The first pulley includes first wheel teeth, and the toothed belt includes belt teeth. The width of the bottom surface of the first tooth groove of the first wheel teeth is smaller than the width of the top surface of the belt teeth, so that the bottom surface of the first tooth groove of the first wheel teeth abuts against the middle part area of the top surface of the belt teeth. At the same time, the top surface of the first tooth of the first wheel teeth is in virtual contact with the bottom surface of the tooth groove of the belt teeth, or there is a gap between the two. During the transmission process, the top surface of the belt teeth forms a support area at the abutting position with the bottom surface of the tooth groove of the first wheel teeth, and force-receiving areas are formed on both sides of the abutting position.

[0011] Further, an abutting member is provided between the bottom surface of the first tooth groove and the middle part area of the tooth - belt top surface.

[0012] Further, both the first set of teeth and the tooth - belt teeth are teeth of equal width, and the tooth width of the tooth - belt teeth is greater than the tooth width of the first set of teeth.

[0013] Further, the width of the top surface of the first tooth is greater than the width of the bottom surface of the first tooth groove, and the two side edges of the first set of teeth are in a gradually changing transition shape that narrows from the tooth top to the tooth groove bottom.

[0014] Even further, the width of the top surface of the first tooth is greater than or equal to the width of the bottom surface of the tooth - belt groove.

[0015] Further, the second pulley includes a second set of teeth. Both the second set of teeth and the tooth - belt teeth are teeth of equal width, and the tooth width of the tooth - belt teeth is less than the tooth width of the second set of teeth.

[0016] Further, the second pulley includes a second set of teeth, and the second tooth top surface on the second set of teeth abuts against the bottom surface of the tooth - belt groove.

[0017] Further, the second pulley includes a second set of teeth; the width of the bottom surface of the second tooth groove of the second set of teeth is less than the width of the top surface of the tooth - belt teeth, so that the bottom surface of the second tooth groove abuts against the middle part area of the tooth - belt top surface; at the same time, the second tooth top surface is in virtual contact with the bottom surface of the tooth - belt groove or there is a gap between the two; during the transmission process, a support area is formed at the abutting position of the tooth - belt top surface and the bottom surface of the second tooth groove, and stress areas are formed on both sides of the abutting position.

[0018] Further, the diameter of the first pulley is less than that of the second pulley.

[0019] Further, a plurality of core ropes are included in the toothed belt. The plurality of core ropes are arranged with equal width in sequence in the width direction of the toothed belt, and the self - twisting directions of the core ropes are alternately opposite.

[0020] A two - wheel vehicle includes the transmission device as described in any one of the above.

[0021] The present invention also provides a two - wheel vehicle, and this two - wheel vehicle includes the above - mentioned transmission device.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the first pulley is engaged with the toothed belt. During meshing transmission, the top surface portion of the belt teeth abuts against the bottom surface of the first tooth groove, so that the first pulley forms a support for a part of the belt teeth. The abutting position is the support area, which can resist the tensile force and the pre-tightening force; force areas that are subjected to the tensile force and the pre-tightening force are formed on both sides of the abutting position, and two-side moments centered on the support area are formed; when the toothed belt and the first pulley move in cooperation, the two-side moments are kept in balance, and the toothed belt remains in the target position; when an external interference force acts on the belt, the external interference force participates in one of the two-side moments to break the moment balance, the position of the support area moves, the width of the force area on the side where the external interference force participates increases, the width of the force area on the other side decreases, and the offset continuously increases until the offset no longer changes and the two-side moments balance under the participation of the external interference force; when the external interference force is withdrawn, the moment on the side where the external interference force originally participated decreases, and the two-side moment balance is broken again. The position of the support area returns to its original position. By arranging the force area, the support area, and the force area in the tooth width direction, the balanced moments are located in the plane where the pulley axis is located, thereby realizing the self-centering effect in the tooth width direction. When it has offset a certain distance, if the external interference force continues to increase, it will continue to offset and form a new moment balance at a larger offset distance. At this time, both the moment that causes the toothed belt to offset and the moment that causes the toothed belt to return to its original position have larger values. If the external interference force is withdrawn, the toothed belt will have a greater restoration ability, that is, the greater the lateral deviation, the stronger the restoration ability.

[0024] 2. In the present invention, a abutting member is arranged between the middle part area of the bottom surface of the first tooth groove and the top surface of the belt teeth. The abutting member abuts against a part of the top surface of the belt teeth, thereby forming a partial support for the belt teeth to form the above-mentioned self-centering effect. The arrangement of the abutting member can facilitate the maintenance and transformation of existing gears.

[0025] 3. In the present invention, the two sides of the first tooth are in a gradually changing transition shape that becomes narrower from the tooth top to the tooth groove bottom. During meshing, the root of the belt tooth can contact and mesh with the top of the first tooth with a larger width. Under the condition of realizing self-centering, the load-bearing capacity is greatly improved and the stress is dispersed, which is also beneficial to improving the transmission accuracy and stability. When the width of the top surface of the first tooth is greater than or equal to the width of the bottom surface of the belt tooth groove, the width of the toothed belt can be fully utilized, and the stability is significantly improved.

[0026] 4. In the present invention, both the second tooth and the belt tooth are of equal width teeth, and the tooth width of the belt tooth is smaller than the tooth width of the second tooth, so that the meshing width during meshing is the tooth width of the belt tooth, thereby fully utilizing the width of the tooth shape to improve the load-bearing capacity of the transmission.

[0027] 5. In the present invention, there is a gap between the bottom surface of the second tooth groove of the second round of teeth and the top surface of the toothed belt. On the basis that the first pulley realizes belt self-centering, the toothed belt on the second pulley is prevented from being over-squeezed during deformation, and thermal expansion or errors are compensated, thereby increasing the overall running stability and reliability of the transmission mechanism.

[0028] 6. The present invention provides a first pulley and a second pulley. The bottom surface of the tooth groove of the first pulley abuts against the top surface of the toothed belt. On the basis that the first pulley realizes belt self-centering, the top surface of the tooth of the second pulley abuts against the bottom surface of the tooth groove of the toothed belt, making the cooperation between the second pulley and the belt closer, which is beneficial to improving the transmission efficiency and load-bearing capacity of the entire transmission device.

[0029] 7. The present invention provides a first pulley and a second pulley. By respectively abutting the bottom surface of the first tooth groove and the bottom surface of the second tooth groove against the middle part area of the top surface of the toothed belt, the toothed belt realizes the above self-centering effect on both the first pulley and the second pulley.

[0030] 8. The present invention provides a first pulley and a second pulley. Since the diameter of the first pulley is smaller than that of the second pulley, the top surface part of the toothed belt abuts against the smaller first pulley, realizing the self-centering effect on the pulley with a smaller wheel diameter. At the same time, because the pulley diameter for realizing self-centering is smaller, the wrap angle of the second pulley is larger, that is, the contact area is larger and the friction force is larger. On the basis of realizing self-centering through the first pulley, the load-bearing capacity of the transmission device is improved through the large wrap angle of the second pulley.

[0031] 9. In the present invention, the reinforcing layer of the belt includes a plurality of core ropes, and a plurality of core ropes with opposite helix directions are alternately arranged in the width direction of the belt, so that when the first pulley abuts against a part of the top surface of the toothed belt, the stress can be more evenly distributed inside the belt, which is beneficial to realizing the self-centering effect. Description of the Drawings

[0032] Figure 1 Schematic diagram of the transmission device for Embodiment 1;

[0033] Figure 2 Schematic diagram of the engagement between the first pulley and the toothed belt in Embodiment 1;

[0034] Figure 3 For Figure 2 Schematic diagram of the force on the cross-section in the A direction in;

[0035] Figure 4 Schematic diagram of the force on the toothed belt after offset under the action of an external interference force;

[0036] Figure 5 Schematic diagram of the engagement between the second pulley and the toothed belt in Embodiment 1;

[0037] Figure 6Schematic diagram of the internal structure of the toothed belt in Embodiment 1;

[0038] Figure 7 Schematic diagram of the structure of the abutting member in Embodiment 1;

[0039] Figure 8 Partial structure schematic diagram of the transmission device in Embodiment 1 from a radial perspective;

[0040] Figure 9 Schematic diagram of the structure of the first pulley in Embodiment 2;

[0041] Figure 10 Schematic diagram of the structure of the first set of teeth in Embodiment 2;

[0042] Figure 11 Schematic diagram of the transmission device in Embodiment 3;

[0043] Figure 12 Schematic diagram of the engagement between the second pulley and the toothed belt in Embodiment 4;

[0044] Reference numerals:

[0045] 1, first pulley; 11, first set of teeth; 111, bottom surface of the first tooth groove; 112, top surface of the first tooth;

[0046] 2, second pulley; 21, second set of teeth; 211, bottom surface of the second tooth groove; 212, top surface of the second tooth;

[0047] 3, toothed belt; 31, belt teeth; 311, bottom surface of the belt tooth groove; 312, top surface of the belt tooth; 32, core rope;

[0048] 41, support area; 42, stress area;

[0049] 5, abutting member. Detailed implementation manners

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0051] Embodiment 1

[0052] As Figure 1As shown in the figure, this embodiment provides a transmission device, which can be specifically applied to two-wheeled bicycles or two-wheeled motorized bicycles. The transmission device includes a first pulley 1, a second pulley 2 and a toothed belt 3 that cooperate with each other. The toothed belt 3 is tensioned between the first pulley 1 and the second pulley 2 to jointly form a belt drive. Among them, teeth 31 are distributed on the toothed belt 3, first-stage teeth 11 are distributed on the first pulley 1, and second-stage teeth 21 are distributed on the second pulley 2. It should be noted that both the first pulley 1 and the second pulley 2 can be used as the driving pulley, and their sizes can also be interchanged. In this embodiment, the first pulley 1 is the driving pulley, and the second pulley 2 is the driven pulley. The first pulley 1 is connected to the pedal or engine of the two-wheeler, and the second pulley 2 is connected to a wheel of the two-wheeler to form a drive for the two-wheeler. At the same time, the diameter of the first pulley 1 is smaller than that of the second pulley 2 to increase the wrap angle on the second pulley 2, thereby increasing the transmission torque, that is, the load-bearing capacity. In this embodiment, the first-stage teeth 11 and the second-stage teeth 21 on the first pulley 1 and the second pulley 2 are both teeth with equal width. In this embodiment, the width of the bottom surface and the top surface of the tooth groove is the length of the root surface of the tooth in the tooth width direction.

[0053] As Figure 2 shown, the first-stage teeth 11 include a first tooth groove bottom surface 111 and a first tooth top surface 112, and the teeth 31 include a tooth groove bottom surface 311 and a tooth top surface 312. The width of the first tooth groove bottom surface 111 of the first-stage teeth 11 is smaller than the width of the tooth top surface 312, that is, the tooth width of the first pulley 1 is smaller than the tooth width of the toothed belt 3, so that the middle part area between the first tooth groove bottom surface 111 and the tooth top surface 312 abuts. At the same time, there is a certain gap between the first tooth top surface 112 and the tooth groove bottom surface 311. The main engagement and transmission between the first pulley 1 and the toothed belt 3 are carried out through the abutting part. In another embodiment, the first tooth top surface 112 and the tooth groove bottom surface 311 can adopt a virtual contact form, where they are in contact but there is no force between them.

[0054] As Figure 3 and Figure 4As shown in the figure, when the first pulley 1 meshes with the toothed belt 3 for transmission, the toothed belt 3 is subjected to a pre-tightening force and a tensile force. Since a partial area of the bottom surface 111 of the first tooth groove abuts against the top surface 312 of the belt tooth, the pre-tightening force and the tensile force received at the abutting area, that is, the support area 41, are offset by the reaction force provided by the bottom surface 111 of the first tooth groove. The stress areas 42 on both sides of the abutting position are subjected to the pre-tightening force and the tensile force. During the meshing transmission, a part of the top surface 312 of the belt tooth abuts against the bottom surface 111 of the first tooth groove, so that the bottom surface 111 of the first tooth groove forms a support for a part of the belt tooth 31. The abutting position is the support area 41, which can resist the tensile force and the pre-tightening force; stress areas 42 that are subjected to the tensile force and the pre-tightening force are formed on both sides of the abutting position, forming two-side torques centered on the support area 41; when the toothed belt 3 moves in cooperation with the pulley, the two-side torques are balanced, and the belt is maintained at the target position. When an external interference force acts on the belt, the external interference force participates in one of the two-side torques to break the torque balance. The position of the support area 41 moves, the width of the stress area 42 on the side where the external interference force participates increases, and the width of the stress area 42 on the other side decreases. The offset amount continuously increases until the offset amount no longer changes to achieve the two-side torque balance under the participation of the external interference force; when the external interference force is withdrawn, the torque on the side where the external interference force originally participated decreases, and the two-side torque balance is broken again. The position of the support area 41 returns to its original position, thereby realizing the self-centering effect of the belt drive. It should be noted that when it has offset a certain distance, if the external interference force continues to increase, it will continue to offset and form a new torque balance at a larger offset distance. At this time, both the torque that offsets the toothed belt 3 and the torque that returns the toothed belt to its original position have larger values. If the external interference force is withdrawn, the toothed belt 3 will have a greater recovery ability, that is, the stronger the recovery ability when it is more laterally offset.

[0055] As Figure 5 shown, in this embodiment, the second tooth 21 of the second pulley 2 includes a second tooth groove bottom surface 211 and a second tooth top surface 212. The meshing method between the second pulley 2 and the toothed belt 3 is ordinary meshing. There is a certain gap between the second tooth groove bottom surface 211 and the belt tooth top surface 312, and there is a certain gap between the second tooth top surface 212 and the belt tooth groove bottom surface 311. In another embodiment, an unloaded virtual contact method can be adopted between the tooth top surface and the tooth groove bottom surface of the two. As Figure 1 shown, in this embodiment, the width of the second tooth 21 of the second pulley 2 is smaller than the width of the belt tooth 31 of the toothed belt 3.

[0056] In another embodiment, as Figure 8 shown, the width of the second tooth 21 of the second pulley 2 is greater than or equal to the width of the belt tooth 31 of the toothed belt 3, so that it has better load-bearing capacity. The tooth width of the first tooth 11 is smaller than the tooth width of the belt tooth 31, so that the maximum meshing width between the first pulley 1, the second pulley 2 and the toothed belt 3 is the tooth width of the belt tooth 31.

[0057] AsFigure 6 As shown, the interior of the toothed belt 3 further includes a plurality of core ropes 32. The core ropes 32 are metal core ropes formed by twisting metal wires into strands, which are used to strengthen the self-rigidity of the toothed belt 3 and are used for better force conduction. A number of core ropes 32 are arranged with equal widths in sequence in the width direction of the toothed belt 3, and the self-twisting directions of the core ropes 32 are alternately opposite. The number of core ropes 32 is preferably an even number. Since the self-twisting directions are opposite, it can effectively prevent the toothed belt 3 from running off by itself and better achieve the self-centering effect.

[0058] In another embodiment, the part of the first pulley 1 that abuts against the top surface 312 of the belt teeth includes increasing the tooth height of the belt teeth 31, reducing the tooth root height of the first set of teeth 11, or providing an abutting member 5 at the tooth root of the first set of teeth 11 to eliminate the gap, as Figure 7 shown. The abutting member 5 enables the first tooth top surface 112 to abut against a part of the bottom surface of the belt teeth 31. The abutting member 5 can be integrally formed with the same material and fixed in the tooth groove of the tooth or fixed on the top surface of the belt teeth 31. The fixing method can adopt splicing structures such as bonding and buckling, and is not specifically limited.

[0059] In this embodiment, the first set of teeth 11 and the wheel body of the first pulley 1 can be integrally formed, combined, detachable, inlaid or welded, and the present invention does not limit this.

[0060] Embodiment 2

[0061] As Figure 9 and Figure 10 shown, the basic structure in this embodiment is the same as that in Embodiment 1, and the difference is that the first set of teeth 11 with a variable design is adopted in the first pulley 1. Specifically: the tooth width of the first set of teeth 11 changes in the radial direction. As Figure 11 shown, the width of the first tooth top surface 112 of the first set of teeth 11 is greater than the width of the first tooth groove bottom surface 111, that is, the two sides of the first set of teeth 11 are in a gradually changing transition shape from wide at the tooth top to narrow at the tooth groove bottom. The tooth width of the first set of teeth 11 gradually becomes smaller on both sides in the width direction during the transition from the tooth top to the first tooth groove bottom surface 111, making the overall tooth width gradually become smaller symmetrically on both sides. Through this structure, it can simultaneously achieve local support of the belt teeth 31 by the first tooth groove bottom surface 111 to realize self-centering, and the root of the belt teeth 31 contacts and meshes with the top of the first set of teeth 11 with a larger width, improving the load-bearing capacity and dispersing stress, and also being beneficial to improving the transmission accuracy and stability. In this embodiment, the width of the first tooth top surface 112 is greater than or equal to the width of the belt tooth top surface 312, significantly improving the load-bearing capacity and dispersing stress.

[0062] In this embodiment, the second pulley 2 has equal-width teeth.

[0063] In this embodiment, the tooth profile shape of the first set of teeth 11 is not specifically limited, and is preferably arc-shaped or involute-shaped.

[0064] Example 3

[0065] As Figure 11 shown, this embodiment is an improvement based on Embodiment 2. The main difference is that the second pulley 2 adopts the same meshing method as the first pulley 1 and also has the effect of self-centering. Specifically, the transmission device includes a first pulley 1, a second pulley 2 and a toothed belt 3 that cooperate with each other. The toothed belt 3 is tensioned between the first pulley 1 and the second pulley 2 to jointly form a belt drive. A partial area of the top surface of the belt teeth 31 is abutted by the bottom surface 111 of the first tooth groove of the first pulley 1, and a partial area of the top surface of the belt teeth 31 is abutted by the bottom surface 211 of the second tooth groove of the second pulley 2. It should be noted that a partial area of the top surface of the belt teeth 31 is abutted by the bottom surface 211 of the second tooth groove of the second pulley 2, so that the toothed belt 3 forms a support area 41 and two side stress areas 42 on the second pulley 2, and further forms the principle of the self-centering effect of torque balance, which is the same as the principle of the self-centering effect of torque balance formed between the first pulley 1 and the toothed belt 3, so it will not be elaborated here.

[0066] Similarly, as Figure 11 shown, the second pulley 2 also adopts a gradient design like the first pulley 1. Specifically, the width of the top surface of the second tooth 21 is greater than the width of the bottom surface of the tooth groove of the second tooth 21, and the two sides of the second tooth 21 are in a gradient transition shape that gradually narrows from the tooth top to the tooth groove bottom. The specific shape of the tooth profile of the second tooth 12 is not limited, and is preferably arc-shaped or involute-shaped.

[0067] Example 4

[0068] As Figure 12 shown, the basic structure in this embodiment is the same as that in Embodiment 1. The difference is that the second top surface 212 of the second pulley 2 abuts against the bottom surface of the belt tooth groove 311, and there is a gap between the second bottom surface 211 of the tooth groove and the top surface 312 of the belt tooth. This structure is designed to increase the meshing angle, improve the contact stress distribution of the belt teeth 31, make the tooth surface contact more uniform, and cooperate with the self-centering structure of the first pulley 1 to improve the transmission performance.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0070] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0071] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0073] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0074] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. A transmission device, comprising a first pulley (1) and a second pulley (2) connected by a toothed belt (3), characterized in that: The first pulley (1) comprises first gear teeth (11), and the toothed belt (3) comprises belt teeth (31); The width of the first tooth groove bottom surface (111) of the first gear tooth (11) is smaller than the width of the belt tooth top surface (312) of the belt tooth (31), so that the first tooth groove bottom surface (111) of the first gear tooth (11) abuts against the middle part of the belt tooth top surface (312) of the belt tooth (31); at the same time, the first tooth top surface (112) of the first gear tooth (11) virtually contacts the belt tooth groove bottom surface (311) of the belt tooth (31), or a gap is left between the two; During the transmission process, the tooth top surface of the belt tooth (31) forms a support area (41) at the abutment point with the tooth groove bottom surface of the first gear tooth (11), and the two sides of the abutment point form a force-bearing area (42).

2. The transmission device according to claim 1, characterized in that: An abutment member (5) is provided between the middle area of ​​the first tooth groove bottom surface (111) and the toothed top surface (312).

3. The transmission device according to claim 1, characterized in that: The first gear teeth (11) and the belt teeth (31) are both teeth of equal width, and the tooth width of the belt teeth (31) is greater than the tooth width of the first gear teeth (11).

4. The transmission device according to claim 1, characterized in that: The width of the first tooth top surface (112) is greater than the width of the first tooth groove bottom surface (111), and the two side edges of the first gear tooth (11) are in a gradual transition shape from wide to narrow from the tooth top to the tooth groove bottom.

5. The transmission device according to claim 4, characterized in that: The width of the first tooth top surface (112) is greater than or equal to the width of the tooth groove bottom surface (311).

6. The transmission device according to claim 1, characterized in that: The second pulley (2) comprises second gear teeth (21), the second gear teeth (21) and the belt teeth (31) are both teeth of equal width, and the tooth width of the belt teeth (31) is smaller than the tooth width of the second gear teeth (21).

7. The transmission device according to claim 1, characterized in that: The second pulley (2) comprises a second gear tooth (21), and a second tooth top surface (312) on the second gear tooth (21) abuts against the belt tooth groove bottom surface (311).

8. The transmission device according to claim 1, characterized in that: The second pulley (2) comprises second gear teeth (21); The width of the second tooth groove bottom surface (211) of the second gear tooth (21) is smaller than the width of the belt tooth top surface (312), so that the second tooth groove bottom surface (211) abuts against the middle part of the belt tooth top surface (312); at the same time, the second tooth top surface (212) on the second gear tooth (21) virtually contacts the belt tooth groove bottom surface (311), or a gap is left between the two; During the transmission process, the toothed top surface (312) forms a support area (41) at the abutment point with the second tooth groove bottom surface (211), and both sides of the abutment point form force-bearing areas (42).

9. The transmission device according to claim 1, characterized in that: The diameter of the first pulley (1) is smaller than that of the second pulley (2).

10. The transmission device according to claim 1, characterized in that: The toothed belt (3) comprises a plurality of core ropes (32), the plurality of core ropes (32) being arranged in sequence with equal width in the width direction of the toothed belt (3), and the self-twisting directions of the core ropes (32) are alternately opposite.

11. A two-wheeled vehicle, characterized in that: Comprising a transmission device as claimed in any one of claims 1 to 9.

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