Mute synchronous pulley

Abstract

The utility model discloses a silent synchronous pulley, which belongs to the technical field of mechanical transmission structures, and comprises a pulley main body, uniformly distributed gear teeth are arranged on the pulley main body, flange structures are arranged at two axial ends of the pulley main body, and a first bump is arranged on one side, facing the gear teeth, of each flange. According to the scheme, the flange structures are arranged at the two axial ends of the belt wheel body and used for directly abutting against the two side edges of the synchronous belt, the flanges are fixedly connected with the belt wheel body, the first protruding blocks face the middle position of the belt wheel body and make contact with the synchronous belt, and the protruding structures of the first protruding blocks enable the contact area of the first protruding blocks and the side edges of the synchronous belt to be reduced; in other words, the contact area of the synchronous belt and the flanges is reduced, so that when the synchronous belt and the belt wheel body rotate in a matched mode, the friction force between the synchronous belt and the flanges is reduced, and meanwhile the noise reduction effect is achieved; in addition, due to the fact that friction force is reduced, heat generated by the synchronous belt is reduced, and the service life of the synchronous belt is prolonged.

Description

Technical Field

[0001] The utility model relates to a pulley structure, more specifically, it relates to a silent synchronous pulley. Background Art

[0002] In traditional transmission fields such as machinery, automobiles, and motorcycles, when the synchronous belt and synchronous pulley run for a long time, the side ribs of the pulley and the high-speed friction between the two sides of the synchronous belt make a harsh "squeaking" sound. At the same time, long-term operation will generate high heat and wear, reducing the service life of the synchronous belt.

[0003] For example: Chinese patent announcement number CN207893090U, announcement date September 21, 2018, the name of the utility model is a synchronous pulley capable of reducing fan noise, the application discloses a synchronous pulley structure, including a synchronous pulley and an edge guard steel plate, mounting bosses are respectively provided on both sides of the synchronous pulley body, mounting holes are respectively opened in the middle of the two edge guard steel plates, the mounting holes of the two edge guard steel plates are respectively inserted into the corresponding mounting bosses of the synchronous pulley body, the two edge guard steel plates are respectively welded to the corresponding mounting bosses of the synchronous pulley body, this scheme can reduce the noise of the synchronous pulley during operation and increase the service life of the synchronous belt, but the reduction effect of this scheme is limited, the synchronous belt near the bottom of the synchronous pulley teeth will still produce large noise, and the noise cannot be eradicated. Utility Model Content

[0004] The utility model overcomes the problem of harsh noise generated by the existing synchronous belt pulley and provides a silent synchronous belt pulley. The solution reduces the contact area between the side of the synchronous belt and other structures to achieve the effect of reducing friction and reduce the sound generated when the synchronous belt is running.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a silent synchronous pulley, comprising a pulley body, the pulley body is provided with evenly distributed gear teeth, the pulley body is provided with a rib structure at both axial ends, and the rib is provided with a first protrusion on the side facing the gear teeth. The rib structure of this solution is arranged at both axial ends of the pulley body, and is used to directly abut against the two sides of the synchronous belt. The rib and the pulley body are fixedly connected, and the first protrusion faces the middle position of the pulley body and will contact the synchronous belt, and the convex structure of the first protrusion reduces the contact area between the first protrusion and the side of the synchronous belt, that is, the contact area between the synchronous belt and the rib is reduced, so that when the synchronous belt and the pulley body rotate in coordination, the friction between the synchronous belt and the rib is reduced, and the noise reduction effect is achieved at the same time; in addition, due to the reduction of friction, the heat generated by the synchronous belt is also reduced, and the service life of the synchronous belt is increased.

[0006] Preferably, the first projection includes a first annular surface and a second annular surface, a first transition section is provided between the first annular surface and the second annular surface, and the first transition section is arc-shaped. The first projection is in a convex state, and along the radial direction of the pulley body, from inside to outside, the first annular surface and the second annular surface are arranged in sequence, and the first transition section between the first annular surface and the second annular surface is arranged in an arc shape, which can protect the side of the synchronous belt from being damaged.

[0007] Preferably, a second projection is provided at the connecting end of the gear teeth and the flanges on both sides, and the second projection includes a first inclined surface and a second inclined surface, wherein the angle between the first inclined surface and the plane where the flange is located is an acute angle; the second inclined surface is arranged on the side of the first inclined surface away from the flange, and the first inclined surface and the second inclined surface are inclined in opposite directions. The first inclined surface on the second projection is in direct contact with the inner side of the flange of the synchronous belt pulley, and the first inclined surface and the flange of the synchronous belt pulley form an inner concave structure, so that the contact area between the gear teeth of the synchronous belt pulley and the synchronous belt on both sides is reduced. When the two ends of the synchronous belt are squeezed with the flange, the synchronous belt will have a deformation tendency toward the position where the first inclined surface is located, reducing the squeezing force between the synchronous belt and the flange, thereby reducing the strong friction between the synchronous belt and the synchronous belt pulley. The second inclined surface is located on the other side of the second projection relative to the first inclined surface, so that the inclined surfaces on both sides of the second projection will not directly contact the synchronous belt, thereby reducing the internal contact area between the pulley body and the synchronous belt, effectively reducing the temperature during operation, avoiding the hardening and coking of the synchronous belt, and increasing the service life of the synchronous belt.

[0008] Preferably, the angle between the first annular surface and the plane where the flange is located is 6° to 10°, and the angle between the second annular surface and the plane where the flange is located is 6° to 10°. The smaller the angle between the first inclined surface and the flange plane, the more the first annular surface and the gear surface of the synchronous belt pulley tend to be flush, which can avoid the synchronous belt pulley from deforming greatly toward the first annular surface and causing the synchronous belt to be eccentric; the angle design between the second annular surface and the flange has the same effect as the first annular surface design. In addition, the angle between the first annular surface and the second annular surface is set in this range, which is also conducive to the processing and forming of the first inclined surface and avoids the generation of sharp angles.

[0009] Preferably, an arc-shaped second transition section is provided between the first bevel and the second bevel, and the second transition section is flush with the gear teeth. The second transition section between the first bevel and the second bevel is set in an arc shape, which can avoid the generation of sharp angles between the first bevel and the second bevel, reduce stress concentration, and also protect the synchronous belt from damage when it cooperates with the synchronous belt. In order to ensure the contact area between the synchronous pulley and the synchronous belt, the height of the transition section and the gear teeth needs to be flush. When the synchronous belt contacts the synchronous pulley, the two sides of the synchronous belt contact the transition section, and the middle part of the synchronous belt contacts the gear teeth of the middle part of the synchronous pulley. On the one hand, it ensures a sufficiently large transmission power, and on the other hand, it can share the transmission power of the synchronous belt to the transition section, and protect the transition section (that is, the second protrusion).

[0010] Preferably, the size ratio of the first inclined surface to the second inclined surface along the axial direction of the pulley body is 1:3 to 1:2. The sizes of the first inclined surface and the second inclined surface need to be designed according to the specifications of the synchronous pulley, that is, the protrusion cannot occupy a large space in the synchronous pulley. At the same time, the sizes of the first inclined surface and the second inclined surface also need to be controlled so that the first inclined surface is smaller than the size of the second inclined surface. The size of the first inclined surface will affect the deformation of the synchronous belt, while the second inclined surface can be slightly larger to reduce heat generation.

[0011] Preferably, a lubricating coating is provided on the side of the rib close to the protrusion. The lubricating coating includes any one or more of Teflon coating, molybdenum disulfide coating and graphite coating. Teflon coating, molybdenum disulfide coating and graphite coating have good heat resistance and low friction, which can avoid large friction between the rib and the synchronous belt, and further reduce noise and temperature during operation.

[0012] Preferably, the second annular surface is arranged at the outer edge of the flange. The second annular surface can be used as a wedge-shaped surface, which can also facilitate the installation of the synchronous belt.

[0013] Preferably, the gear teeth on the pulley body are transitioned by arc surfaces. The arc surfaces are arranged between the gears on the pulley body to avoid right-angle grooves between the gear teeth, which can improve the performance of the pulley body.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) it can reduce the noise made by the synchronous belt during operation, and the operation can be basically silent; (2) it can effectively reduce the temperature during operation, avoid hardening and coking of the synchronous belt, and increase the service life of the synchronous belt; (3) it has a simple structure, reduced cost, and is easy to implement, and the product has higher cost performance and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the utility model.

[0016] Figure 2 It is a schematic diagram of the rib of the utility model.

[0017] Figure 3 This is a schematic diagram of the second protrusion structure of the utility model.

[0018] Figure 4 It is an axonometric drawing of the present utility model.

[0019] In the figure: 1. pulley body, 2. gear teeth, 3. rib, 31. first protrusion, 311. first annular surface, 312. second annular surface, 313. first transition section, 4. second protrusion, 41. first inclined surface, 42. second inclined surface, 43. second transition section, 6. arc surface, 7. lubricating coating. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Example 1: Figure 1 , Figure 2 and Figure 4 A silent synchronous pulley shown in the figure comprises a pulley body 1, a gear tooth 2 structure evenly distributed in the circumferential direction of the pulley body 1, and a rib 3 structure is arranged on both sides of the gear tooth 2, and the rib 3 and the end face of the pulley body 1 are flush, making the synchronous pulley more concise and beautiful as a whole. During the use of the synchronous pulley, the synchronous belt (not shown in the figure) needs to be placed between the ribs 3 on the two end faces of the synchronous pulley, and the two side edges of the synchronous belt in the width direction are in contact with the inner side of the rib 3 on the synchronous pulley.

[0022] Since the synchronous belt and the synchronous pulley will inevitably generate a lateral (axial) force during operation, the synchronous belt will generate an extrusion force with the rib 3 on one side of the synchronous pulley, causing the synchronous pulley to generate noise. It should be noted that the rib 3 structure in this solution can be fixed to the pulley body 1 by welding or detachable connection.

[0023] A first protrusion is arranged on the rib, and the first protrusion faces the axial middle position of the pulley body. A first annular surface 31 and a second annular surface 32 are arranged on the first protrusion. Along the radial direction of the pulley body 1, the first annular surface 311 and the second annular surface 312 are arranged from the inside to the outside. The rib 3 structure is a circular ring structure, and its inner ring is fixed with the pulley body 1 structure. The first annular surface 311 and the second annular surface 312 are smoothly connected by a circular arc-shaped first transition section 313 to form a raised structure. The raised structure reduces the contact area between the first protrusion 31 and the side of the synchronous belt, that is, the contact area between the synchronous belt and the rib 3 is reduced, so that when the synchronous belt and the pulley body 1 rotate in coordination, the friction between the synchronous belt and the rib 3 is reduced, and the noise reduction effect is achieved at the same time; in addition, since the friction is reduced, the heat generated by the synchronous belt is also reduced, thereby improving the service life of the synchronous belt.

[0024] When one side of the synchronous belt tends to displace toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first annular surface 311 and the second annular surface 312, the first annular surface 311 and the second annular surface 312 are in a non-contact state with the synchronous belt. Therefore, when the synchronous belt is extruded from the flange 3, the synchronous belt tends to deform toward the positions of the first annular surface 311 and the second annular surface 312, thereby reducing the overall extrusion pressure between the synchronous belt and the flange 3, thereby reducing the relatively strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0025] In this solution, the angle between the first annular surface 311 and the second annular surface 312 and the rib 3 is 8°, and the first annular surface 311 and the second annular surface 312 have the same inclination and opposite inclination directions; of course, the inclinations of the first annular surface 311 and the second annular surface 312 may be unequal. The inclinations of the first annular surface 311 and the second annular surface 312 are reasonably designed, which, on the one hand, facilitates the production and processing of the first annular surface 311 and the second annular surface 312, and on the other hand, avoids the generation of sharp angle structures.

[0026] Example 2: Figures 1 to 4 A silent synchronous pulley shown in the figure comprises a pulley body 1, a gear tooth 2 structure evenly distributed in the circumferential direction of the pulley body 1, and a rib 3 structure is arranged on both sides of the gear tooth 2, and the rib 3 and the end face of the pulley body 1 are flush, making the synchronous pulley more concise and beautiful as a whole. During the use of the synchronous pulley, the synchronous belt (not shown in the figure) needs to be placed between the ribs 3 on the two end faces of the synchronous pulley, and the two side edges of the synchronous belt in the width direction are in contact with the inner side of the rib 3 on the synchronous pulley.

[0027] Since the synchronous belt and the synchronous pulley will inevitably generate a lateral (axial) force during operation, the synchronous belt will generate an extrusion force with the rib 3 on one side of the synchronous pulley, causing the synchronous pulley to generate noise. It should be noted that the rib 3 structure in this solution can be fixed to the pulley body 1 by welding or detachable connection.

[0028] A first protrusion is arranged on the rib, and the first protrusion faces the axial middle position of the pulley body. A first annular surface 31 and a second annular surface 32 are arranged on the first protrusion. Along the radial direction of the pulley body 1, the first annular surface 311 and the second annular surface 312 are arranged from the inside to the outside. The rib 3 structure is a circular ring structure, and its inner ring is fixed with the pulley body 1 structure. The first annular surface 311 and the second annular surface 312 are smoothly connected by a circular arc-shaped first transition section 313 to form a raised structure. The raised structure reduces the contact area between the first protrusion 31 and the side of the synchronous belt, that is, the contact area between the synchronous belt and the rib 3 is reduced, so that when the synchronous belt and the pulley body 1 rotate in coordination, the friction between the synchronous belt and the rib 3 is reduced, and the noise reduction effect is achieved at the same time; in addition, since the friction is reduced, the heat generated by the synchronous belt is also reduced, thereby improving the service life of the synchronous belt.

[0029] When one side of the synchronous belt tends to displace toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first annular surface 311 and the second annular surface 312, the first annular surface 311 and the second annular surface 312 are in a non-contact state with the synchronous belt. Therefore, when the synchronous belt is extruded from the flange 3, the synchronous belt tends to deform toward the positions of the first annular surface 311 and the second annular surface 312, thereby reducing the overall extrusion pressure between the synchronous belt and the flange 3, thereby reducing the relatively strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0030] In this solution, the angle between the first annular surface 311 and the second annular surface 312 and the rib 3 is 8°, and the first annular surface 311 and the second annular surface 312 have the same inclination and opposite inclination directions; of course, the inclinations of the first annular surface 311 and the second annular surface 312 may be unequal. The inclinations of the first annular surface 311 and the second annular surface 312 are reasonably designed, which, on the one hand, facilitates the production and processing of the first annular surface 311 and the second annular surface 312, and on the other hand, avoids the generation of sharp angle structures.

[0031] A second protrusion 4 structure is provided at both ends of the gear tooth 2 on the pulley body 1, and the second protrusion 4 is in direct contact with the inner side of the flange 3. Specifically, the second protrusion 4 includes a first inclined surface 41 and a second inclined surface 42, the first inclined surface 41 is provided on the side close to the inner side of the flange 3 and is directly connected to the inner side of the flange 3, and the second inclined surface 42 is provided on the side away from the flange 3, so that a protruding structure is formed at both ends of the gear tooth 2, that is, a recessed area is formed between the protrusion and the inner side of the flange 3, and a recessed area is also formed between the protrusion and the main body of the gear tooth 2. Since the tooth top surface of the gear tooth 2 and the plane where the flange 3 is located are perpendicular to each other, the first inclined surface 41 recessed between the flange 3 and the protrusion 4 will form an acute angle structure with the flange 3.

[0032] When one side of the synchronous belt tends to be displaced toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first inclined surface 41, the first inclined surface 41 and the synchronous belt are in a non-contact state. Therefore, when the synchronous belt is squeezed against the flange 3, the synchronous belt will also tend to deform toward the position of the first inclined surface 41, further reducing the extrusion pressure between the synchronous belt and the flange 3, thereby reducing the strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0033] The inclination direction of the second bevel 42 is opposite to that of the first bevel 41, thereby forming a second protrusion 4 on the gear tooth 2; that is, after the synchronous belt and the synchronous pulley are matched, the synchronous belt will not contact the first bevel 41, nor will it contact the second bevel 42; the separation of the second bevel 42 and the synchronous belt can reduce the heat generated by both sides of the synchronous belt and the pulley body 1, effectively reduce the temperature during operation, avoid hardening and coking of the synchronous belt, and increase the service life of the synchronous belt.

[0034] In order to ensure that there is no sharp structure on the top of the second protrusion 4, an arc-shaped second transition section 43 is set between the first inclined surface 41 and the second inclined surface 42, which can increase the contact area between the synchronous belt and the second transition section 43 on the one hand, and prevent the synchronous belt from being damaged by the sharp structure on the other hand. In addition, the top of the second protrusion 4 contacts the synchronous belt, and the main part of the gear tooth 2 also needs to contact the synchronous belt. The main body of the gear tooth is located between the two second protrusions 4, so the second transition section 43 needs to be flush with the tooth top surface of the gear tooth 2, so that the synchronous belt contacts the second protrusion 4 and the main body of the gear tooth 2 at the same time, avoiding that only the second protrusion 4 contacts the synchronous belt, which causes the second protrusion 4 to be damaged due to a large force. In addition, the main body of the gear tooth 2 can also have a good lateral restraint effect on the synchronous belt, avoiding the synchronous belt from being offset.

[0035] In this solution, the angle between the first bevel 41 and the rib 3 is 82°, that is, the angle between the first bevel 41 and the tooth top surface of the gear tooth 2 is 8°, the inclination of the second bevel 42 is the same as the inclination of the first bevel 41, and the angle between the second bevel 42 and the tooth top surface of the gear tooth 2 is -8° ("-" represents the direction); of course, the inclinations of the first bevel 41 and the second bevel 42 may not be equal. The inclinations of the first bevel 41 and the second bevel 42 are reasonably designed, which, on the one hand, facilitates the production and processing of the first bevel 41 and the second bevel 42, and on the other hand, avoids the generation of sharp angle structures that cause internal stress in the synchronous pulley. The size ratio of the first bevel 41 and the second bevel 42 along the axial direction of the synchronous belt pulley is 1:3. The sizes of the first bevel 41 and the second bevel 42 need to be designed according to the specifications of the synchronous belt pulley, that is, the second protrusion 4 cannot occupy a large space in the synchronous belt pulley. At the same time, the sizes of the first bevel 41 and the second bevel 42 also need to be controlled so that the first bevel 41 is smaller than the second bevel 42. The size of the first bevel 41 will affect the deformation of the synchronous belt, while the second bevel 42 can be slightly larger to reduce heat generation.

[0036] In order to further reduce the friction between the synchronous belt and the rib 3, a coating layer is further provided on the inner side of the rib 3, that is, on the first protrusion 31. Specifically, the coating layer can be a lubricating coating 7. The lubricating coating includes any one or more of Teflon coating, molybdenum disulfide coating and graphite coating. Teflon coating, molybdenum disulfide coating and graphite coating have good heat resistance and low friction, can avoid large friction between the rib and the synchronous belt, and further reduce noise and temperature during operation.

[0037] Example 3: Figures 1 to 4 A silent synchronous pulley shown in the figure comprises a pulley body 1, a gear tooth 2 structure evenly distributed in the circumferential direction of the pulley body 1, and a rib 3 structure is arranged on both sides of the gear tooth 2, and the rib 3 and the end face of the pulley body 1 are flush, making the synchronous pulley more concise and beautiful as a whole. During the use of the synchronous pulley, the synchronous belt (not shown in the figure) needs to be placed between the ribs 3 on the two end faces of the synchronous pulley, and the two side edges of the synchronous belt in the width direction are in contact with the inner side of the rib 3 on the synchronous pulley.

[0038] Since the synchronous belt and the synchronous pulley will inevitably generate a lateral (axial) force during operation, the synchronous belt will generate an extrusion force with the rib 3 on one side of the synchronous pulley, causing the synchronous pulley to generate noise. It should be noted that the rib 3 structure in this solution can be fixed to the pulley body 1 by welding or detachable connection.

[0039] A first protrusion is arranged on the rib, and the first protrusion faces the axial middle position of the pulley body. A first annular surface 31 and a second annular surface 32 are arranged on the first protrusion. Along the radial direction of the pulley body 1, the first annular surface 311 and the second annular surface 312 are arranged from the inside to the outside. The rib 3 structure is a circular ring structure, and its inner ring is fixed with the pulley body 1 structure. The first annular surface 311 and the second annular surface 312 are smoothly connected by a circular arc-shaped first transition section 313 to form a raised structure. The raised structure reduces the contact area between the first protrusion 31 and the side of the synchronous belt, that is, the contact area between the synchronous belt and the rib 3 is reduced, so that when the synchronous belt and the pulley body 1 rotate in coordination, the friction between the synchronous belt and the rib 3 is reduced, and the noise reduction effect is achieved at the same time; in addition, since the friction is reduced, the heat generated by the synchronous belt is also reduced, thereby improving the service life of the synchronous belt.

[0040] When one side of the synchronous belt tends to displace toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first annular surface 311 and the second annular surface 312, the first annular surface 311 and the second annular surface 312 are in a non-contact state with the synchronous belt. Therefore, when the synchronous belt is extruded from the flange 3, the synchronous belt tends to deform toward the positions of the first annular surface 311 and the second annular surface 312, thereby reducing the overall extrusion pressure between the synchronous belt and the flange 3, thereby reducing the relatively strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0041] In this solution, the angle between the first annular surface 311 and the second annular surface 312 and the rib 3 is 8°, and the first annular surface 311 and the second annular surface 312 have the same inclination and opposite inclination directions; of course, the inclinations of the first annular surface 311 and the second annular surface 312 may be unequal. The inclinations of the first annular surface 311 and the second annular surface 312 are reasonably designed, which, on the one hand, facilitates the production and processing of the first annular surface 311 and the second annular surface 312, and on the other hand, avoids the generation of sharp angle structures.

[0042] A second protrusion 4 structure is provided at both ends of the gear tooth 2 on the pulley body 1, and the second protrusion 4 is in direct contact with the inner side of the flange 3. Specifically, the second protrusion 4 includes a first inclined surface 41 and a second inclined surface 42, the first inclined surface 41 is provided on the side close to the inner side of the flange 3 and is directly connected to the inner side of the flange 3, and the second inclined surface 42 is provided on the side away from the flange 3, so that a protruding structure is formed at both ends of the gear tooth 2, that is, a recessed area is formed between the protrusion and the inner side of the flange 3, and a recessed area is also formed between the protrusion and the main body of the gear tooth 2. Since the tooth top surface of the gear tooth 2 and the plane where the flange 3 is located are perpendicular to each other, the first inclined surface 41 recessed between the flange 3 and the protrusion 4 will form an acute angle structure with the flange 3.

[0043] When one side of the synchronous belt tends to be displaced toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first inclined surface 41, the first inclined surface 41 and the synchronous belt are in a non-contact state. Therefore, when the synchronous belt is squeezed against the flange 3, the synchronous belt will also tend to deform toward the position of the first inclined surface 41, further reducing the extrusion pressure between the synchronous belt and the flange 3, thereby reducing the strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0044] The inclination direction of the second bevel 42 is opposite to that of the first bevel 41, thereby forming a second protrusion 4 on the gear tooth 2; that is, after the synchronous belt and the synchronous pulley are matched, the synchronous belt will not contact the first bevel 41, nor will it contact the second bevel 42; the separation of the second bevel 42 and the synchronous belt can reduce the heat generated by both sides of the synchronous belt and the pulley body 1, effectively reduce the temperature during operation, avoid hardening and coking of the synchronous belt, and increase the service life of the synchronous belt.

[0045] In order to ensure that there is no sharp structure on the top of the second protrusion 4, an arc-shaped second transition section 43 is set between the first inclined surface 41 and the second inclined surface 42, which can increase the contact area between the synchronous belt and the second transition section 43 on the one hand, and prevent the synchronous belt from being damaged by the sharp structure on the other hand. In addition, the top of the second protrusion 4 contacts the synchronous belt, and the main part of the gear tooth 2 also needs to contact the synchronous belt. The main body of the gear tooth is located between the two second protrusions 4, so the second transition section 43 needs to be flush with the tooth top surface of the gear tooth 2, so that the synchronous belt contacts the second protrusion 4 and the main body of the gear tooth 2 at the same time, avoiding that only the second protrusion 4 contacts the synchronous belt, which causes the second protrusion 4 to be damaged due to a large force. In addition, the main body of the gear tooth 2 can also have a good lateral restraint effect on the synchronous belt, avoiding the synchronous belt from being offset.

[0046] In this solution, the angle between the first bevel 41 and the rib 3 is 82°, that is, the angle between the first bevel 41 and the tooth top surface of the gear tooth 2 is 8°, the inclination of the second bevel 42 is the same as the inclination of the first bevel 41, and the angle between the second bevel 42 and the tooth top surface of the gear tooth 2 is -8° ("-" represents the direction); of course, the inclinations of the first bevel 41 and the second bevel 42 may not be equal. The inclinations of the first bevel 41 and the second bevel 42 are reasonably designed, which, on the one hand, facilitates the production and processing of the first bevel 41 and the second bevel 42, and on the other hand, avoids the generation of sharp angle structures that cause internal stress in the synchronous pulley. The size ratio of the first bevel 41 and the second bevel 42 along the axial direction of the synchronous belt pulley is 1:3. The sizes of the first bevel 41 and the second bevel 42 need to be designed according to the specifications of the synchronous belt pulley, that is, the second protrusion 4 cannot occupy a large space in the synchronous belt pulley. At the same time, the sizes of the first bevel 41 and the second bevel 42 also need to be controlled so that the first bevel 41 is smaller than the second bevel 42. The size of the first bevel 41 will affect the deformation of the synchronous belt, while the second bevel 42 can be slightly larger to reduce heat generation.

[0047] On the inner side of the flange 3 and close to the outer edge of the flange 3 is the second annular surface 312, which is conducive to the installation of the synchronous belt. When the synchronous belt is matched with the synchronous pulley, the side position of the outer surface of the synchronous belt does not contact the second annular surface 312, thereby reducing the contact area between the side of the synchronous belt and the top of the flange 3 (that is, the second annular surface 312), thereby reducing the side friction of the synchronous belt, reducing noise and temperature.

[0048] Example 4: Figures 1 to 4 A silent synchronous pulley shown in the figure comprises a pulley body 1, a gear tooth 2 structure evenly distributed in the circumferential direction of the pulley body 1, and a rib 3 structure is arranged on both sides of the gear tooth 2, and the rib 3 and the end face of the pulley body 1 are flush, making the synchronous pulley more concise and beautiful as a whole. During the use of the synchronous pulley, the synchronous belt (not shown in the figure) needs to be placed between the ribs 3 on the two end faces of the synchronous pulley, and the two side edges of the synchronous belt in the width direction are in contact with the inner side of the rib 3 on the synchronous pulley.

[0049] Since the synchronous belt and the synchronous pulley will inevitably generate a lateral (axial) force during operation, the synchronous belt will generate an extrusion force with the rib 3 on one side of the synchronous pulley, causing the synchronous pulley to generate noise. It should be noted that the rib 3 structure in this solution can be fixed to the pulley body 1 by welding or detachable connection.

[0050] A first protrusion is arranged on the rib, and the first protrusion faces the axial middle position of the pulley body. A first annular surface 31 and a second annular surface 32 are arranged on the first protrusion. Along the radial direction of the pulley body 1, the first annular surface 311 and the second annular surface 312 are arranged from the inside to the outside. The rib 3 structure is a circular ring structure, and its inner ring is fixed with the pulley body 1 structure. The first annular surface 311 and the second annular surface 312 are smoothly connected by a circular arc-shaped first transition section 313 to form a raised structure. The raised structure reduces the contact area between the first protrusion 31 and the side of the synchronous belt, that is, the contact area between the synchronous belt and the rib 3 is reduced, so that when the synchronous belt and the pulley body 1 rotate in coordination, the friction between the synchronous belt and the rib 3 is reduced, and the noise reduction effect is achieved at the same time; in addition, since the friction is reduced, the heat generated by the synchronous belt is also reduced, thereby improving the service life of the synchronous belt.

[0051] When one side of the synchronous belt tends to displace toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first annular surface 311 and the second annular surface 312, the first annular surface 311 and the second annular surface 312 are in a non-contact state with the synchronous belt. Therefore, when the synchronous belt is extruded from the flange 3, the synchronous belt tends to deform toward the positions of the first annular surface 311 and the second annular surface 312, thereby reducing the overall extrusion pressure between the synchronous belt and the flange 3, thereby reducing the relatively strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0052] In this solution, the angle between the first annular surface 311 and the second annular surface 312 and the rib 3 is 8°, and the first annular surface 311 and the second annular surface 312 have the same inclination and opposite inclination directions; of course, the inclinations of the first annular surface 311 and the second annular surface 312 may be unequal. The inclinations of the first annular surface 311 and the second annular surface 312 are reasonably designed, which, on the one hand, facilitates the production and processing of the first annular surface 311 and the second annular surface 312, and on the other hand, avoids the generation of sharp angle structures.

[0053] A second protrusion 4 structure is provided at both ends of the gear tooth 2 on the pulley body 1, and the second protrusion 4 is in direct contact with the inner side of the flange 3. Specifically, the second protrusion 4 includes a first inclined surface 41 and a second inclined surface 42, the first inclined surface 41 is provided on the side close to the inner side of the flange 3 and is directly connected to the inner side of the flange 3, and the second inclined surface 42 is provided on the side away from the flange 3, so that a protruding structure is formed at both ends of the gear tooth 2, that is, a recessed area is formed between the protrusion and the inner side of the flange 3, and a recessed area is also formed between the protrusion and the main body of the gear tooth 2. Since the tooth top surface of the gear tooth 2 and the plane where the flange 3 is located are perpendicular to each other, the first inclined surface 41 recessed between the flange 3 and the protrusion 4 will form an acute angle structure with the flange 3.

[0054] When one side of the synchronous belt tends to be displaced toward the flange 3 of the pulley body 1, the extrusion pressure between the synchronous belt and the flange 3 increases. Due to the existence of the first inclined surface 41, the first inclined surface 41 and the synchronous belt are in a non-contact state. Therefore, when the synchronous belt is squeezed against the flange 3, the synchronous belt will also tend to deform toward the position of the first inclined surface 41, further reducing the extrusion pressure between the synchronous belt and the flange 3, thereby reducing the strong friction between the synchronous belt and the flange 3 of the pulley body 1. The reduced friction between the synchronous belt and the synchronous pulley also reduces the generation of noise.

[0055] The inclination direction of the second bevel 42 is opposite to that of the first bevel 41, thereby forming a second protrusion 4 on the gear tooth 2; that is, after the synchronous belt and the synchronous pulley are matched, the synchronous belt will not contact the first bevel 41, nor will it contact the second bevel 42; the separation of the second bevel 42 and the synchronous belt can reduce the heat generated by both sides of the synchronous belt and the pulley body 1, effectively reduce the temperature during operation, avoid hardening and coking of the synchronous belt, and increase the service life of the synchronous belt.

[0056] In order to ensure that there is no sharp structure on the top of the second protrusion 4, an arc-shaped second transition section 43 is set between the first inclined surface 41 and the second inclined surface 42, which can increase the contact area between the synchronous belt and the second transition section 43 on the one hand, and prevent the synchronous belt from being damaged by the sharp structure on the other hand. In addition, the top of the second protrusion 4 contacts the synchronous belt, and the main part of the gear tooth 2 also needs to contact the synchronous belt. The main body of the gear tooth is located between the two second protrusions 4, so the second transition section 43 needs to be flush with the tooth top surface of the gear tooth 2, so that the synchronous belt contacts the second protrusion 4 and the main body of the gear tooth 2 at the same time, avoiding that only the second protrusion 4 contacts the synchronous belt, which causes the second protrusion 4 to be damaged due to a large force. In addition, the main body of the gear tooth 2 can also have a good lateral restraint effect on the synchronous belt, avoiding the synchronous belt from being offset.

[0057] In this solution, the angle between the first bevel 41 and the rib 3 is 82°, that is, the angle between the first bevel 41 and the tooth top surface of the gear tooth 2 is 8°, the inclination of the second bevel 42 is the same as the inclination of the first bevel 41, and the angle between the second bevel 42 and the tooth top surface of the gear tooth 2 is -8° ("-" represents the direction); of course, the inclinations of the first bevel 41 and the second bevel 42 may not be equal. The inclinations of the first bevel 41 and the second bevel 42 are reasonably designed, which, on the one hand, facilitates the production and processing of the first bevel 41 and the second bevel 42, and on the other hand, avoids the generation of sharp angle structures that cause internal stress in the synchronous pulley. The size ratio of the first bevel 41 and the second bevel 42 along the axial direction of the synchronous belt pulley is 1:3. The sizes of the first bevel 41 and the second bevel 42 need to be designed according to the specifications of the synchronous belt pulley, that is, the second protrusion 4 cannot occupy a large space in the synchronous belt pulley. At the same time, the sizes of the first bevel 41 and the second bevel 42 also need to be controlled so that the first bevel 41 is smaller than the second bevel 42. The size of the first bevel 41 will affect the deformation of the synchronous belt, while the second bevel 42 can be slightly larger to reduce heat generation.

[0058] In this solution, arc surfaces 6 are provided between the gear teeth 2 on the pulley body 1, and the arc surfaces 6 can avoid the generation of right-angle grooves between the gear teeth 2, thereby improving the performance of the pulley cylinder 1. Similarly, in order to cooperate with the arc surfaces 6, a corresponding adaptive arc groove structure is also provided on the inner side of the synchronous belt, which can also avoid the generation of right-angle grooves on the synchronous belt and correspondingly improve the performance of the synchronous belt.

[0059] Embodiment 5: Any permutation and combination of the above-mentioned Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4 can form a new independent solution, which belongs to the protection scope of this application.

Claims

1. A silent synchronous pulley, comprising a pulley body, on which gear teeth are evenly distributed, characterized in that: The pulley body is provided with a rib structure at both axial ends, and the rib is provided with a first protrusion on the side facing the gear tooth; the first protrusion includes a first annular surface and a second annular surface, and a first transition section is provided between the first annular surface and the second annular surface; a second protrusion is provided at the connecting end between the gear tooth and the ribs on both sides, and the second protrusion includes a first inclined surface and a second inclined surface, and the angle between the first inclined surface and the plane where the rib is located is an acute angle.

2. A silent synchronous pulley according to claim 1, characterized in that: The first transition section is arc-shaped.

3. A silent synchronous pulley according to claim 1, characterized in that: The second inclined surface is arranged on a side of the first inclined surface away from the retaining edge, and the first inclined surface and the second inclined surface have opposite inclination directions.

4. A silent synchronous pulley according to claim 2, characterized in that: The included angle between the first annular surface and the plane where the retaining edge is located is 6° to 10°, and the included angle between the second annular surface and the plane where the retaining edge is located is 6° to 10°.

5. A silent synchronous pulley according to claim 3, characterized in that: An arc-shaped second transition section is provided between the first inclined surface and the second inclined surface, and the second transition section is flush with the gear teeth.

6. A silent synchronous pulley according to claim 3 or 5, characterized in that: A size ratio between the first inclined surface and the second inclined surface along the axial direction of the pulley body is 1:3 to 1:

2.

7. A silent synchronous pulley according to any one of claims 1 to 5, characterized in that: A lubricating coating is provided on the first protrusion.

8. A silent synchronous pulley according to any one of claims 2 to 5, characterized in that: The second annular surface is arranged on the outer edge of the rib.

9. A silent synchronous pulley according to any one of claims 1 to 5, characterized in that: The gear teeth on the pulley body are transitioned through arc surfaces.

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