Synchronous belt pulley shaft connecting bearing

Abstract

This utility model discloses a synchronous belt pulley shaft-connected bearing, including a synchronous shaft. The outer peripheral wall of the synchronous shaft has a gear groove for engaging with an external synchronous belt drive. The synchronous shaft has an axially extending shaft hole for engaging with an external shaft system. The inner peripheral wall of the shaft hole has an internal spline for engaging with a keyway on the external shaft system. Both ends of the synchronous shaft are equipped with angular contact bearings to bear part of the force applied to the synchronous shaft by the external shaft system during operation. Each angular contact bearing includes an outer ring and rolling elements. Raceways for the rolling elements are formed on the inner peripheral wall of the outer ring and the outer peripheral wall of the synchronous shaft. This utility model solves the problems of complex assembly processes for traditional synchronous belt pulley shaft systems and bearings, the need for precision machining of the shaft system to accommodate the bearings, and premature bearing failure due to misalignment or improper installation.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a synchronous belt pulley shaft connecting bearing. Background Technology

[0002] In fields such as automated equipment, machine tools, and conveying machinery that require synchronous transmission and shaft support, the structure combining synchronous belt drive and bearing support is a core functional component. Its transmission accuracy, assembly efficiency, and service life directly determine the overall performance of the equipment. Currently, the industry generally adopts a traditional separate design scheme, in which the synchronous belt pulley, shaft, and bearing are independently manufactured discrete components that require multiple assembly processes.

[0003] Specifically, in this traditional solution, the synchronous pulley needs to be fixed to the pre-installed section of the shaft by key connection or interference fit, and the bearing needs to be press-fitted to both ends of the shaft with special tools such as a press. In order to ensure the fit accuracy between the bearing inner hole and the shaft, the shaft bearing installation section needs to be precision machined, and the external diameter tolerance, roundness and coaxiality tolerances need to be strictly controlled. The processing procedure is complicated and the cost is high.

[0004] Meanwhile, the traditional solution has significant drawbacks: First, the assembly process requires additional adjustment of the bearing preload to obtain a suitable working clearance, and shims need to be selected to compensate for assembly errors. The steps are cumbersome and the bearing may be misaligned or not fully in place due to improper operation. Second, during long-term operation, the fit between the bearing inner hole and the shaft may become loose, or the connection between the synchronous pulley and the shaft may fail, resulting in decreased transmission accuracy, uneven bearing stress, and ultimately premature bearing failure. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a synchronous belt pulley shaft connecting bearing, which solves the problems of complex assembly processes of traditional synchronous belt pulley shaft systems and bearings, the need for precision machining of the shaft system to adapt to the bearing, and premature bearing failure due to misalignment or improper installation.

[0006] To achieve the above objectives, this utility model provides a synchronous belt pulley shaft bearing, including a synchronous shaft. The outer peripheral wall of the synchronous shaft is provided with a gear groove for engaging with an external synchronous belt drive. The synchronous shaft has an axially extending shaft hole for engaging with an external shaft system. The inner peripheral wall of the shaft hole is provided with an internal spline for engaging with a keyway on the external shaft system. Both ends of the synchronous shaft are provided with angular contact bearings for bearing part of the force applied to the synchronous shaft by the external shaft system during operation. The angular contact bearing includes an outer ring and rolling elements. The inner peripheral wall of the outer ring and the outer peripheral wall of the synchronous shaft are provided with raceways for the movement of the rolling elements.

[0007] The advantages of adopting the above technical solution are as follows: The synchronous shaft integrates gear grooves, shaft holes, internal splines, and angular contact bearing mounting structures, eliminating the need for additional assembly of synchronous pulleys and bearing inner rings, reducing the number of discrete components, and simplifying the overall structure; the gear grooves directly cooperate with external synchronous belt drives, avoiding transmission errors caused by the clearance between the synchronous pulley and the shaft, thus improving transmission accuracy; the shaft hole provides a stable assembly foundation for the external shaft system, and the internal splines cooperate with the keyways of the external shaft system, enhancing power transmission stability and preventing slippage during operation; the angular contact bearings at both ends of the synchronous shaft can effectively bear the forces applied by the external shaft system, especially suitable for axial force scenarios, improving the overall load-bearing capacity; the raceways of the inner circumferential wall of the outer ring and the outer circumferential wall of the synchronous shaft provide a smooth movement path for the rolling elements, reducing frictional losses during rolling element operation and lowering energy consumption; the integrated design of the bearing and synchronous shaft eliminates the fitting process between the bearing inner ring and the shaft, avoiding the problem of premature bearing failure caused by improper fitting in traditional assembly, improving structural reliability and service life, while simplifying the assembly process and improving production efficiency.

[0008] The present invention further comprises: a retaining edge is provided circumferentially on the outer peripheral wall of the synchronous shaft, the retaining edge being located between two outer rings, and stepped grooves connecting the inner walls on both sides of the retaining edge to the outer peripheral wall of the synchronous shaft, a retaining ring being provided on the stepped groove, the two retaining rings being arranged opposite each other and each retaining ring being located inside the adjacent rolling body, and the outer peripheral wall of the retaining ring being fitted with the inner peripheral wall of the adjacent outer ring with a clearance fit.

[0009] The advantages of adopting the above technical solution are: the retaining edge of the outer peripheral wall of the synchronous shaft can axially limit the outer rings of the two angular contact bearings, preventing the outer rings from moving during operation, ensuring accurate bearing installation position, and maintaining transmission stability; the stepped groove formed by the inner walls on both sides of the retaining edge and the outer peripheral wall of the synchronous shaft provides a clear installation reference for the retaining ring, ensuring accurate positioning of the retaining ring and avoiding retaining ring offset from affecting the protective effect; the retaining ring is located inside the adjacent rolling elements, which can not only limit the axial displacement of the rolling elements and prevent the rolling elements from leaving the raceway, ensuring normal bearing operation, but also block external impurities from approaching the rolling elements, reducing the wear of impurities on the raceway and rolling elements caused by impurities entering the bearing interior; the clearance fit between the outer peripheral wall of the retaining ring and the inner peripheral wall of the outer ring does not interfere with the relative operation of the outer ring and the synchronous shaft, and can form a preliminary dust barrier to further block impurities, eliminating the need for additional independent dustproof components, simplifying the structural layout, saving installation space, reducing component costs, and improving overall economy.

[0010] The present invention further includes: the inner peripheral wall of the retaining ring is bent with an elastic part, the elastic part is made of elastic material and is respectively fitted with the inner wall of the adjacent retaining edge and the inner wall of the stepped groove.

[0011] The advantages of adopting the above technical solution are as follows: The elastic part of the inner peripheral wall of the retaining ring is made of elastic material, which expands and tightens with the inner wall of the retaining edge and the inner wall of the stepped groove, enabling quick positioning and installation of the retaining ring without the need for additional fasteners such as bolts and clips, simplifying assembly operations and improving assembly efficiency; the expansion fit can tightly fill the gap between the retaining ring and the retaining edge and stepped groove, reducing the risk of external impurities entering the bearing through the fit gap and improving protective sealing; at the same time, the elastic part has a certain deformation capacity, which can absorb the slight vibration generated during the operation of the synchronous shaft, reduce the rigid collision between the retaining ring and the retaining edge and stepped groove, reduce operating noise, and avoid component wear caused by long-term collision. Moreover, the deformation characteristics of the elastic part can adaptively adjust the tightening force according to the slight thermal expansion and contraction of the synchronous shaft due to temperature changes, preventing the retaining ring from loosening or becoming too tight due to temperature fluctuations, ensuring that the retaining ring can stably perform its limiting and dustproof functions for a long time, improving the reliability of the retaining ring and indirectly extending the overall life of the bearing.

[0012] The present invention further includes a sealing ring, which is located outside the rolling element and is positioned opposite to an adjacent retaining ring. The outer peripheral wall of the sealing ring is connected to the inner peripheral wall of the outer ring, and the inner peripheral wall of the sealing ring has a sealing lip that is tightly fitted with the outer peripheral wall of the synchronous shaft.

[0013] The advantages of adopting the above technical solution are as follows: The sealing ring of the angular contact bearing is located on the outside of the rolling elements, with its outer peripheral wall connected to the inner peripheral wall of the outer ring. The sealing lip of the inner peripheral wall is tightly fitted with the outer peripheral wall of the synchronous shaft, forming a tight sealing barrier on the outside of the rolling elements. This effectively prevents external impurities and liquids from entering the bearing, avoiding wear between the rolling elements and raceways due to impurities. It also prevents leakage of lubricating grease inside the bearing, ensuring that the rolling elements are in a state of sufficient lubrication for a long time, reducing frictional loss, and maintaining bearing operating efficiency. The sealing ring and the adjacent retaining ring are arranged opposite each other, forming a double protection structure. This compensates for the inadequacy of a single retaining ring, further improving the dustproof and waterproof effect, and reducing the risk of bearing failure due to impurities or moisture. The tight fit design of the sealing lip ensures the sealing effect without hindering the normal rotation of the synchronous shaft. The sealing lip is also elastic, which can adapt to slight radial runout during synchronous shaft operation, always maintaining a stable sealing state, reducing the frequency of bearing maintenance, and extending the bearing maintenance cycle and overall service life.

[0014] The present invention further includes the following feature: water-retaining rings are provided on the outer peripheral walls at both ends of the synchronous shaft, and the water-retaining rings are positioned on the outer side of the adjacent rolling elements.

[0015] The advantages of adopting the above technical solution are as follows: In the above technology, the water-retaining rings on the outer peripheral walls of both ends of the synchronous shaft are located outside the adjacent rolling elements. They can directly prevent splashing water generated by the movement of the external shaft system from approaching the bearing interior, avoiding water intrusion into the bearing interior which could lead to corrosion of the rolling elements and raceways, or emulsification and failure of the internal lubricating grease. This effectively protects the core components of the bearing, extends the bearing service life, and the water-retaining rings are integrated at both ends of the synchronous shaft, fitting compactly with the bearing structure. This eliminates the need for additional installation space inside the equipment, simplifies the overall structural layout, and adapts to the miniaturization design requirements of the equipment. As the first protective barrier on the outside of the bearing, the water-retaining rings can intercept most of the splashing water in advance, reducing the frequency of contact between the subsequent sealing components such as the sealing rings and water. This reduces the risk of aging and sealing failure of the sealing components due to long-term contact with water, improves the reliability of the overall bearing protection system, and ensures stable operation of the bearing in humid or water-splashing conditions.

[0016] The present invention further comprises: a shoulder is provided circumferentially on the outer peripheral wall at both ends of the synchronous shaft; the outer wall of the shoulder and the outer peripheral wall of the synchronous shaft are combined to form a stepped surface; the inner peripheral wall of the water-blocking ring is tightly fitted with the stepped surface, and the inner wall of the water-blocking ring is tightly fitted with the outer wall of the shoulder.

[0017] The advantages of adopting the above technical solution are as follows: In the above technology, the shoulders of the outer peripheral walls at both ends of the synchronous shaft combine with the outer peripheral walls of the synchronous shaft to form a stepped surface, providing a clear and precise installation reference for the water-blocking ring, ensuring that the axial installation position of the water-blocking ring is uniform, avoiding insufficient water-blocking range or interference with other components due to installation offset, and ensuring stable water-blocking effect. The expansion fit between the inner peripheral wall of the water-blocking ring and the stepped surface, and the expansion fit between the inner wall of the water-blocking ring and the outer wall of the shoulder, can realize a firm connection between the water-blocking ring and the synchronous shaft, preventing the water-blocking ring from loosening or axial movement when the synchronous shaft is running at high speed, ensuring that the water-blocking ring is always in an effective water-blocking position and plays a stable protective role. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a cross-sectional view of the present invention. Detailed Implementation

[0019] This utility model provides a synchronous belt pulley shaft connecting bearing, including a synchronous shaft 1. The outer peripheral wall of the synchronous shaft 1 is provided with a gear groove 11 for engaging with an external synchronous belt drive. The synchronous shaft 1 has an axially extending shaft hole 12 for engaging with an external shaft system. The inner peripheral wall of the shaft hole 12 is circumferentially provided with an internal spline 13 for engaging with a keyway on the external shaft system. Both ends of the synchronous shaft 1 are provided with angular contact bearings 2 for bearing part of the force applied to the synchronous shaft 1 by the external shaft system during operation. The bearing 2 includes an outer ring 21 and rolling elements 22. Raceways 23 for the rolling elements 22 are formed on the inner peripheral wall of the outer ring 21 and the outer peripheral wall of the synchronous shaft 1. A retaining edge 14 is circumferentially arranged on the outer peripheral wall of the synchronous shaft 1, positioned between the two outer rings 21. Stepped grooves 141 connect the inner walls of both sides of the retaining edge 14 to the outer peripheral wall of the synchronous shaft 1. Retaining rings 3 are provided on the stepped grooves 141, with two retaining rings 3 positioned opposite each other and each retaining ring 3 located inside the adjacent rolling element 22. The outer peripheral wall of ring 3 is clearance-fitted with the inner peripheral wall of the adjacent outer ring 21. The inner peripheral wall of the retaining ring 3 is bent with an elastic part 31. The elastic part 31 is made of elastic material and is tightened with the inner wall of the adjacent retaining edge 14 and the inner wall of the stepped groove 141. The angular contact bearing 2 also includes a sealing ring 4. The sealing ring 4 is located outside the rolling element 22 and is opposite to the adjacent retaining ring 3. The outer peripheral wall of the sealing ring 4 is connected to the inner peripheral wall of the outer ring 21. The inner peripheral wall of the sealing ring 4 is shaped like a... The synchronous shaft 1 has a sealing lip 41 that is tightly fitted to the outer peripheral wall of the synchronous shaft 1. Water-blocking rings 15 are provided on the outer peripheral walls at both ends of the synchronous shaft 1. The water-blocking rings 15 are located on the outer side of the adjacent rolling elements 22. Shoulders 151 are circumferentially formed on the outer peripheral walls at both ends of the synchronous shaft 1. The outer wall of the shoulder 151 and the outer peripheral wall of the synchronous shaft 1 combine to form a stepped surface 152. The inner peripheral wall of the water-blocking ring 15 is tightly fitted to the stepped surface 152, and the inner wall of the water-blocking ring 15 is tightly fitted to the outer wall of the shoulder 151.

[0020] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A bearing for connecting a synchronous belt pulley shaft, characterized in that: The system includes a synchronous shaft. The outer peripheral wall of the synchronous shaft has a gear groove for engaging with an external synchronous belt drive. The synchronous shaft has an axially extending shaft hole for engaging with an external shaft system. The inner peripheral wall of the shaft hole has an internal spline for engaging with a keyway on the external shaft system. Both ends of the synchronous shaft are provided with angular contact bearings for bearing part of the force applied to the synchronous shaft by the external shaft system during operation. The angular contact bearing includes an outer ring and rolling elements. The inner peripheral wall of the outer ring and the outer peripheral wall of the synchronous shaft are provided with raceways for the rolling elements to move.

2. The synchronous belt pulley shaft connecting bearing according to claim 1, characterized in that: A retaining edge is circumferentially arranged on the outer peripheral wall of the synchronous shaft. The retaining edge is located between two outer rings. The inner walls on both sides of the retaining edge are connected to the outer peripheral wall of the synchronous shaft by stepped grooves. A retaining ring is arranged on the stepped groove. The two retaining rings are arranged opposite each other and each retaining ring is located inside the adjacent rolling body. The outer peripheral wall of the retaining ring is fitted with the inner peripheral wall of the adjacent outer ring with a clearance fit.

3. The synchronous belt pulley shaft connecting bearing according to claim 2, characterized in that: The inner peripheral wall of the retaining ring is bent with an elastic part, which is made of elastic material and is respectively fitted with the inner wall of the adjacent retaining edge and the inner wall of the stepped groove.

4. A synchronous belt pulley shaft connecting bearing according to claim 3, characterized in that: The angular contact bearing also includes a sealing ring, which is located outside the rolling element and is positioned opposite to an adjacent retaining ring. The outer peripheral wall of the sealing ring is connected to the inner peripheral wall of the outer ring, and the inner peripheral wall of the sealing ring has a sealing lip that is tightly fitted with the outer peripheral wall of the synchronous shaft.

5. A synchronous belt pulley shaft connecting bearing according to claim 1, characterized in that: Water-retaining rings are provided on the outer peripheral walls at both ends of the synchronous shaft, and the water-retaining rings are located on the outer side of the adjacent rolling elements.

6. A synchronous belt pulley shaft connecting bearing according to claim 5, characterized in that: Shoulders are circumferentially formed on the outer peripheral walls at both ends of the synchronous shaft. The outer wall of the shoulder and the outer peripheral wall of the synchronous shaft combine to form a stepped surface. The inner peripheral wall of the water-blocking ring is tightly fitted with the stepped surface, and the inner wall of the water-blocking ring is tightly fitted with the outer wall of the shoulder.

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