Pulley axle
By setting a distributed buffer structure on the central shaft of the pulley, the vibration and impact problems caused by the rigid connection of the central shaft of the traditional pulley are solved, achieving more stable power transmission and equipment protection, and locally damaged parts can be replaced individually.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO EF TECH DEV CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-06-26
AI Technical Summary
Traditional belt pulley shafts experience vibration and impact during power transmission due to rigid connection. Existing damping structures are prone to damage under alternating loads and can only absorb vibration in one direction, resulting in limited compensation capabilities.
A pulley shaft is designed by evenly spaced first protrusions on the outer periphery of the rear end of the drive pulley shaft hole, which cooperate with the second protrusion on the inner wall of the coupling cavity of the driven pulley to fix a buffer block, forming a distributed buffer structure that absorbs radial and axial vibrations, reduces stress concentration, and allows for partial replacement of damaged parts.
It effectively reduces vibration and impact during power transmission, improves equipment operation stability, protects equipment and extends service life, and allows for individual replacement of locally damaged parts.
Smart Images
Figure CN224414291U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pulley shaft. Background Technology
[0002] Belt drives, as a traditional power transmission method, are widely used in vehicles such as bicycles and motorcycles. The core component, the pulley, achieves efficient power transmission through its cooperation with the belt. During operation, uneven belt tension, load fluctuations, or shaft misalignment can easily cause vibration and impact between the driving and driven pulleys, affecting the equipment's lifespan and operational stability. Traditional belt pulleys use a rigid connection between the driving and driven pulleys, which can lead to vibration transmission, causing belt jumping, slippage, or even breakage. Current shock absorption structures typically use a single cylindrical or ring-shaped structure, which is prone to tearing at the edges under alternating loads and can only absorb radial or axial vibrations, resulting in limited compensation capabilities. Utility Model Content
[0003] This utility model provides a pulley shaft.
[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:
[0005] The pulley shaft includes a driving pulley and a driven pulley that cooperate with each other. The front end of the driven pulley is provided with a coupling cavity, and the rear end of the driving pulley is fitted into the coupling cavity. The outer periphery of the rear end of the driving pulley shaft hole is provided with first protrusions at even intervals, and a buffer block is provided between adjacent first protrusions. The rear end of the buffer block is provided with a groove. The inner wall of the coupling cavity is provided with second protrusions at even intervals relative to the groove. After the driving pulley and the driven pulley are fixedly engaged, the first protrusions and the second protrusions cooperate to fix the buffer block.
[0006] Preferably, a pulley is fitted at the front end of the shaft hole of the driving wheel, and a gear is fixed on the outer side of the rear end of the driven wheel. The gear cooperates with the chain to move in conjunction with the wheel.
[0007] Preferably, a first bearing, a second bearing, and a third bearing are installed in the shaft holes of the driving wheel and the driven wheel, with the second bearing passing through the driving wheel and the driven wheel.
[0008] Preferably, a first bushing is provided between the first bearing and the second bearing, and a second bushing is provided between the second bearing and the third bearing.
[0009] Preferably, the first bearing is installed at the front end of the drive wheel shaft hole, and the third bearing is installed at the rear end of the driven wheel shaft hole.
[0010] Preferably, the buffer block body is fan-shaped.
[0011] Compared with the prior art, the pulley shaft of this utility model has a first protrusion evenly spaced on the outer periphery of the rear end of the drive pulley shaft hole, a buffer block between adjacent first protrusions, a groove at the rear end of the buffer block, and a second protrusion evenly spaced on the inner wall of the coupling cavity relative to the groove. The first and second protrusions cooperate to fix the buffer block in the coupling cavity. The distributed buffer block can improve the load-bearing capacity, reduce stress concentration, and can be replaced individually if locally damaged. At the same time, it can absorb radial and axial vibrations, reduce vibration and impact during power transmission, protect the equipment and improve the smoothness of operation. Attached Figure Description
[0012] Figure 1 This is an exploded view of the central shaft of the pulley of this utility model.
[0013] Figure 2 This is a three-dimensional schematic diagram of the central shaft of the pulley of this utility model.
[0014] Figure 3 This is a cross-sectional view of the central shaft of the pulley of this utility model. Detailed Implementation
[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0016] like Figures 1 to 3 As shown, the pulley shaft includes a driving pulley 1 and a driven pulley 6 that cooperate with each other. A pulley (not shown in the figure) is fitted at the front end of the shaft hole of the driving pulley 1. The motor drives the pulley through belt drive and drives the driving pulley 1 at the same time. A gear 62 is fixed on the outer side of the rear end of the driven pulley 6. The gear 62 cooperates with the chain to link with the wheel.
[0017] The driven wheel 6 has a coupling cavity 61 at its front end, and the rear end of the driving wheel 1 is fitted into the coupling cavity 61. A first bearing 3, a second bearing 5, and a third bearing 8 are installed in the shaft holes of the driving wheel 1 and the driven wheel 6. The second bearing 5 passes through the driving wheel 1 and the driven wheel 6. The first bearing 3 is installed at the front end of the shaft hole of the driving wheel 1, and the third bearing 8 is installed at the tail end of the shaft hole of the driven wheel 6. A first bushing 4 is provided between the first bearing 3 and the second bearing 5, and a second bushing 7 is provided between the second bearing 5 and the third bearing 8.
[0018] The outer periphery of the rear end of the shaft hole of the drive wheel 1 is provided with first protrusions 11 evenly spaced. A buffer block 2 is provided between adjacent first protrusions 11. The main body of the buffer block 2 is fan-shaped and made of rubber. The rear end of the buffer block 2 is provided with a groove 21. The inner wall of the coupling cavity 61 is provided with second protrusions 611 evenly spaced relative to the groove 21. After the drive wheel 1 and the driven wheel 6 are fixedly engaged, the first protrusions 11 and the second protrusions 611 cooperate to fix the buffer block 2. When the motor drives the drive wheel 1, the drive wheel 1 drives the driven wheel 6. The main functions of the buffer block 2 are: i. to alleviate the instantaneous torque fluctuation during start-up and stop; ii. to prevent the vibration of the motor or the drive wheel 1 from being transmitted to the driven wheel 6; iii. to compensate for deviations and allow for slight misalignment between the two shafts; iv. to reduce noise.
[0019] The pulley shaft of this utility model has first protrusions 11 evenly spaced on the outer periphery of the rear end of the shaft hole of the drive pulley 1. Buffer blocks 2 are arranged between adjacent first protrusions 11. The rear end of the buffer block 2 is provided with a groove 21. Second protrusions 611, which are opposite to the groove 21, are evenly spaced on the inner wall of the coupling cavity 61. The first protrusions 11 and the second protrusions 611 cooperate to fix the buffer blocks 2 in the coupling cavity 61. The distributed buffer blocks 2 can improve the load-bearing capacity, reduce stress concentration, and can be replaced individually if locally damaged. At the same time, they can absorb radial and axial vibrations, reduce vibration and impact during power transmission, protect the equipment, and ensure the smoothness of operation.
[0020] Finally, it should be noted that the above embodiments only illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A pulley shaft, comprising a driving pulley (1) and a driven pulley (6) that cooperate with each other; the front end of the driven pulley (6) is provided with a coupling cavity (61), and the rear end of the driving pulley (1) is sleeved in the coupling cavity (61), characterized in that, The drive wheel (1) has a first protrusion (11) evenly spaced on the outer periphery of the rear end of the shaft hole. A buffer block (2) is provided between adjacent first protrusions (11). The rear end of the buffer block (2) is provided with a groove (21). The inner wall of the coupling cavity (61) is evenly spaced with a second protrusion (611) relative to the groove (21). After the drive wheel (1) and the driven wheel (6) are fixedly engaged, the first protrusion (11) and the second protrusion (611) work together to fix the buffer block (2).
2. The belt pulley shaft according to claim 1, characterized in that, The drive wheel (1) has a pulley fitted at the front end of its shaft hole, and a gear (62) is fixed on the outer side of the rear end of the driven wheel (6). The gear (62) cooperates with the chain to link with the wheel.
3. The pulley shaft according to claim 1, characterized in that, The first bearing (3), the second bearing (5) and the third bearing (8) are installed in the shaft holes of the driving wheel (1) and the driven wheel (6), and the second bearing (5) passes through the driving wheel (1) and the driven wheel (6).
4. The pulley shaft according to claim 3, characterized in that, A first bushing (4) is provided between the first bearing (3) and the second bearing (5), and a second bushing (7) is provided between the second bearing (5) and the third bearing (8).
5. The pulley shaft according to claim 3, characterized in that, The first bearing (3) is installed at the front end of the shaft hole of the driving wheel (1), and the third bearing (8) is installed at the tail end of the shaft hole of the driven wheel (6).
6. The pulley shaft according to claim 1, characterized in that, The buffer block (2) is fan-shaped.