Belt pulley bearing mounting structure
By adopting an axial positioning structure in the pulley bearing mounting structure, the problem of bearing out-of-roundness caused by traditional interference fits is solved, achieving a stable connection between the bearing and the pulley, and ensuring the high precision and stable operation of the equipment.
Patent Information
- Application Number
- CN202520155695.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2035-01-22
AI Technical Summary
The interference fit between traditional pulleys and bearings can cause the bearings to become out of round, affecting the movement accuracy and stability of the equipment.
An axial positioning structure is adopted, which clamps the outer circle of the bearing through a stepped ring and positioning structure to avoid radial force and ensure a stable connection between the bearing and the pulley.
It effectively prevents bearings from going out of round, ensures smooth and stable bearing rotation, and improves the movement accuracy and stability of equipment.
Smart Images
Figure CN223511436U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pulley structure, and more specifically, to a pulley bearing mounting structure. Background Technology
[0002] In traditional pulley assembly methods, the pulley and bearing, and the bearing and shaft, are usually interference fits. However, this fit causes the bearing to be compressed radially by the pulley and shaft, easily leading to bearing out-of-roundness and problems such as uneven pulley rotation and vibration. In precision equipment, these problems with the pulley directly cause belt vibration and wobbling, directly affecting the movement accuracy of moving parts and greatly impacting the quality of the equipment. Utility Model Content
[0003] The purpose of this utility model is to address the shortcomings of the prior art by providing a pulley bearing mounting structure that is compact and uses axial positioning to avoid bearing out-of-roundness.
[0004] The technical solution of this utility model is implemented as follows: a pulley bearing mounting structure includes a pulley, at least one bearing is provided in the inner ring of the pulley, a stepped ring is provided on one side of the inner ring of the pulley to cooperate with the outer circle of the bearing, and a first positioning structure is provided on the other side of the inner ring of the pulley. The first positioning structure cooperates with the stepped ring to clamp and fix the outer circle of the bearing.
[0005] In the above-mentioned pulley bearing mounting structure, the first positioning structure includes a stamped step disposed near the end of the inner ring of the pulley, the horizontal plane of the stamped step being located above the upper end face of the outer circle of the bearing; and a plurality of stamped first positioning pressure points are distributed circumferentially on the stamped step.
[0006] In the above-mentioned pulley bearing mounting structure, the distance between the horizontal plane of the stamping step and the upper end face of the outer circle of the bearing is 0.2-4mm.
[0007] In the above-mentioned pulley bearing mounting structure, the bearing is provided with a pin shaft, and the pin shaft is provided with a stepped boss that mates with the inner circle of the bearing at one end of the stepped ring, and a second positioning structure that mates with the bearing is provided at the other end of the pin shaft.
[0008] In the above-mentioned pulley bearing mounting structure, the second positioning structure includes a stamping part disposed on the upper end of the pin shaft. The horizontal plane of the stamping part is located above the upper end face of the inner circle of the bearing, and a plurality of stamped second positioning pressure points are distributed circumferentially on the stamping part.
[0009] In the above-mentioned pulley bearing mounting structure, the distance between the horizontal plane of the stamping part and the upper end face of the inner circle of the bearing is 0.2-4mm.
[0010] In the above-mentioned pulley bearing mounting structure, at least two bearings are stacked inside the pulley, and a separation unit is provided between adjacent bearings.
[0011] In the above-described pulley bearing mounting structure, the separating unit is a shim disposed between two bearings.
[0012] With the above-mentioned structure, the outer diameter of the bearing is adapted to the inner diameter of the pulley. The bearing is clamped and limited in the axial direction by the stepped ring and the first positioning structure, so that the bearing and the pulley will not generate forces in the radial direction, which can avoid the bearing from going out of round and effectively ensure the smoothness and stability of the bearing rotation. Attached Figure Description
[0013] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a cross-sectional structural diagram of the present invention.
[0016] In the figure: 1. Pulley; 2. Bearing; 3. Step ring; 4. First positioning structure; 4a. Stamped step; 4b. First positioning pressure point; 5. Pin shaft; 6. Step boss; 7. Second positioning structure; 7a. Stamping part; 7b. Second positioning pressure point; 8. Separating unit. Detailed Implementation
[0017] See Figure 1-2 As shown, this utility model discloses a pulley bearing mounting structure, including a pulley 1. At least one bearing 2 is disposed within the inner ring of the pulley 1. A stepped ring 3, which mates with the outer diameter of the bearing 2, is provided on one side of the inner ring of the pulley 1. A first positioning structure 4 is provided on the other side of the inner ring of the pulley 1. The first positioning structure 4, in conjunction with the stepped ring 3, clamps and fixes the outer diameter of the bearing 2. The outer diameter of the bearing is adapted to the inner diameter of the pulley. The stepped ring and the first positioning structure clamp and limit the bearing axially, preventing radial force between the bearing and the pulley, thus avoiding bearing out-of-roundness and effectively ensuring rotational performance. With this structure, the bearing and pulley do not require interference fit during installation; their inner and outer diameters can be the same or within industry-permissible tolerances, making the assembly of the bearing and pulley very convenient.
[0018] In this embodiment, preferably, the first positioning structure 4 includes a stamped step 4a disposed near the end of the inner ring of the pulley 1, the horizontal plane of the stamped step 4a being located above the upper surface of the outer circle of the bearing 2; a plurality of stamped first positioning pressure points 4b are distributed circumferentially on the stamped step 4a. When the bearing is placed into the inner hole of the pulley, the stamped step at the first positioning pressure point is stamped into a sheet shape by the stamping equipment and closely adheres to the outer surface of the outer circle of the bearing, which can effectively ensure stable clamping and facilitate operation.
[0019] Furthermore, preferably, the distance between the horizontal plane of the stamping step 4a and the upper end face of the outer circle of the bearing 2 is 0.2-4mm. When the height of the stamping step is within this range, the pressure plate formed by the stamping of the first positioning pressure point can have sufficient contact restriction with the outer circle of the bearing without affecting the rotation of the bearing.
[0020] In this embodiment, preferably, the bearing 2 is provided with a pin shaft 5. At one end of the pin shaft 5, a stepped boss 6 that mates with the inner circle of the bearing 2 is located on the stepped ring 3. At the other end of the pin shaft 5, a second positioning structure 7 that mates with the bearing 2 is provided. The pin shaft is axially fixed by the second positioning structure, which is identical to the first positioning structure, further reducing the radial force on the bearing, ensuring that the bearing does not become out of round, and effectively guaranteeing the rotation effect.
[0021] Preferably, the second positioning structure 7 includes a stamping part 7a disposed on the upper end of the pin shaft 5. The horizontal plane of the stamping part 7a is located above the upper end face of the inner circle of the bearing 2. A plurality of stamped second positioning pressure points 7b are distributed circumferentially on the stamping part 7a. When the pin shaft is inserted into the inner hole of the bearing, the stamping step at the second positioning pressure point is stamped into a sheet shape by the stamping equipment and closely adheres to the outer surface of the inner circle of the bearing, which can effectively ensure stable clamping and facilitate operation.
[0022] In addition, the second positioning structure can also be fixed by setting a detachable pin and washer on the upper end of the pin shaft, which makes it easy to disassemble and assemble the pin shaft.
[0023] Furthermore, preferably, the distance between the horizontal plane of the stamping part 7a and the upper end face of the inner circle of the bearing 2 is 0.2-4mm. When the height of the stamping part above the upper end face of the inner circle of the bearing is within this range, the pressure plate formed by the first positioning pressure point stamping can have sufficient contact restriction with the outer circle of the bearing without affecting the rotation of the bearing.
[0024] In this embodiment, preferably, at least two bearings 2 are stacked inside the pulley 1, and a separator unit 8 is provided between adjacent bearings 2. The arrangement of at least two bearings on the pulley is primarily to accommodate variations in belt width, ensuring smooth belt operation.
[0025] In this embodiment, preferably, the separating unit 8 is a shim disposed between two bearings 2. Using a shim to separate two adjacent bearings results in a simple structure and convenient assembly.
[0026] During assembly, the bearing is placed inside the pulley, and then the pin shaft is fitted with the inner hole of the bearing. The pressure plates of the first and second positioning structures are pressed down by the stamping equipment to clamp the bearing, thus completing the assembly of the pulley, bearing and pin shaft.
[0027] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.
Claims
1. A pulley bearing mounting structure, comprising a pulley (1), characterized in that, The inner ring of the pulley (1) is provided with at least one bearing (2). A stepped ring (3) that mates with the outer circle of the bearing (2) is provided on one side of the inner ring of the pulley (1). A first positioning structure (4) is provided on the other side of the inner ring of the pulley (1). The first positioning structure (4) and the stepped ring (3) work together to clamp and fix the outer circle of the bearing (2).
2. The pulley bearing mounting structure according to claim 1, characterized in that, The first positioning structure (4) includes a stamping step (4a) located near the end of the inner ring of the pulley (1), the horizontal surface of the stamping step (4a) being located above the upper surface of the outer circle of the bearing (2); a plurality of stamped first positioning pressure points (4b) are distributed circumferentially on the stamping step (4a).
3. The pulley bearing mounting structure according to claim 2, characterized in that, The distance between the horizontal plane of the stamping step (4a) and the upper end face of the outer circle of the bearing (2) is 0.2-4mm.
4. The pulley bearing mounting structure according to claim 1, characterized in that, The bearing (2) is provided with a pin shaft (5). The pin shaft (5) is located at one end of the stepped ring (3) and has a stepped boss (6) that mates with the inner circle of the bearing (2). At the other end of the pin shaft (5), there is a second positioning structure (7) that mates with the bearing (2).
5. The pulley bearing mounting structure according to claim 4, characterized in that, The second positioning structure (7) includes a stamping part (7a) disposed on the upper end of the pin shaft (5). The horizontal plane of the stamping part (7a) is located above the upper end face of the inner circle of the bearing (2). Several stamped second positioning pressure points (7b) are distributed circumferentially on the stamping part (7a).
6. The pulley bearing mounting structure according to claim 5, characterized in that, The distance between the horizontal plane of the stamping part (7a) and the upper end face of the inner circle of the bearing (2) is 0.2-4mm.
7. The pulley bearing mounting structure according to claim 1, characterized in that, At least two bearings (2) are stacked inside the pulley (1), and a separation unit (8) is provided between two adjacent bearings (2).
8. The pulley bearing mounting structure according to claim 7, characterized in that, The separating unit (8) is a gasket placed between the two bearings (2).