Low vibration sliding bearing for large electric machines
By adopting an elliptical lower bearing arc and a four-lobe upper half-bearing structure in the sliding bearing of a large motor, the problem of insufficient oil film stiffness is solved, achieving high rotational accuracy and strong load-bearing capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENKE SLIDE BEARING
- Filing Date
- 2025-07-01
- Publication Date
- 2026-06-16
AI Technical Summary
The existing oil film of bearings used in large equipment has poor horizontal stiffness and limited load-bearing capacity, making it difficult to meet high-performance requirements.
A low-vibration sliding bearing for large motors is designed, which adopts an elliptical lower bearing arc and a four-oil-blade upper half-bearing structure. The combination of two oil wedges on the left and right and an oil reservoir improves the oil film stiffness and load-bearing capacity.
It achieves improved oil film stiffness, smooth shaft operation, low vibration, high rotational accuracy, and strong load-bearing capacity.
Smart Images
Figure CN224364248U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sliding bearing technology, and more specifically to a low-vibration sliding bearing for large motors. Background Technology
[0002] Sliding bearings are widely used in various industries and have the characteristics of high load-bearing capacity, good stability, and high rotational accuracy.
[0003] Hydrodynamic lubrication is one of the lubrication methods for sliding bearings. It utilizes a lubricating fluid film formed between the rotating body and the support to bear the load and avoid direct friction between the two solids. It is suitable for medium-to-high speed and unstable load conditions. The performance of hydrodynamic sliding bearings is greatly affected by the shape of the inner bore bearing. A reasonable bearing shape design can improve the bearing's performance and economy under specific operating conditions.
[0004] The existing bearings used in large equipment are generally four-leaf bearings, which have four axial lubrication grooves. These grooves are arranged in equal positions to form a wedge-shaped gap. However, the four wedge-shaped gaps limit their load-bearing capacity. Some bearings are elliptical, which have poorer horizontal stiffness of the oil film and higher load-bearing capacity. Utility Model Content
[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a low-vibration sliding bearing for large motors. Its two oil wedges make the lower bearing arc elliptical, forming the lower half of the bearing, while the upper left and upper right bearing arcs and the oil reservoir between them form the upper half of the four-leaf bearing, giving it sufficient oil film stiffness and load-bearing capacity.
[0006] The solution of this utility model to the aforementioned technical problem is:
[0007] A low-vibration sliding bearing for large motors comprises an upper left arc-shaped bearing block, an upper right arc-shaped bearing block, and a lower arc-shaped bearing block;
[0008] The bottom left end of the upper left arc-shaped bearing block presses against the top left end of the lower arc-shaped bearing block, and the bottom right end of the upper right arc-shaped bearing block presses against the top right end of the lower arc-shaped bearing block. The pivot is located between the inner walls of the upper left arc-shaped bearing block, the upper right arc-shaped bearing block, and the lower arc-shaped bearing block.
[0009] The lower arc-shaped bearing block has an outwardly extending wall surface at both the left and right ends of its arc-shaped inner sidewall, forming an oil wedge between it and the corresponding outer sidewall of the rotating shaft.
[0010] The right end face of the upper left arc-shaped bearing block presses against the left end face of the upper right arc-shaped bearing block;
[0011] An arc-shaped groove is formed at the lower right end face of the upper left arc-shaped bearing block, and an arc-shaped groove is formed at the lower left end face of the upper right arc-shaped bearing block. The two arc-shaped grooves form an oil storage tank.
[0012] The outstanding effect of this utility model is:
[0013] Its two oil wedges on the left and right make the lower bearing arc elliptical, forming the lower half of the bearing, while the upper left and upper right bearing arcs and the oil reservoir between them form the upper half of the four-oil-leaf bearing, giving it sufficient oil film stiffness and load-bearing capacity. Attached Figure Description
[0014] Figure 1 This is a partial structural schematic diagram of the present invention;
[0015] Figure 2 This is a partial schematic diagram of the rotating shaft of this utility model and its relationship with the upper left, upper right, and lower tile arcs. Detailed implementation method:
[0016] For example, see below. Figures 1 to 2 As shown, a low-vibration sliding bearing for a large motor comprises an upper left arc-shaped bearing block 10, an upper right arc-shaped bearing block 20, and a lower arc-shaped bearing block 30.
[0017] The bottom left end of the upper left arc-shaped bearing 10 presses against the top left end of the lower arc-shaped bearing 30, and the bottom right end of the upper right arc-shaped bearing 20 presses against the top right end of the lower arc-shaped bearing 30. The rotating shaft 100 is located between the inner walls of the upper left arc-shaped bearing 10, the upper right arc-shaped bearing 20, and the lower arc-shaped bearing 30.
[0018] The lower arc-shaped bearing block 30 has wall surfaces extending obliquely outward at both the left and right ends of its arc-shaped inner sidewall, forming an oil wedge 19 between it and the corresponding outer sidewall of the rotating shaft 100.
[0019] The right end face of the upper left arc-shaped bearing block 10 presses against the left end face of the upper right arc-shaped bearing block 20;
[0020] An arc-shaped groove 11 is formed at the lower part of the right end face of the upper left arc-shaped bearing block 10, and an arc-shaped groove 11 is formed at the lower part of the left end face of the upper right arc-shaped bearing block 20. The two arc-shaped grooves 11 form an oil storage tank.
[0021] Furthermore, the inner wall of the upper left arc-shaped bearing block 10 is the upper left arc 1, and the inner wall of the upper right arc-shaped bearing block 20 is the upper right arc 2. The upper left arc 1 and the upper right arc 2 are symmetrically distributed along the vertical center line. The center of the arc of the upper left arc 1 is in the fourth quadrant and the angle with the X-axis is 45°. The distance from the center of this arc to the theoretical center (the origin of the coordinate system) is δs, where δs > 0. The upper left arc 1 and the upper right arc 2 form the upper half of the four-leaf bearing. The center of the arc of the upper right arc 2 is in the third quadrant and the angle with the X-axis is also 45°.
[0022] The center of the arc of the lower arc 3 of the lower arc bearing block 30 is on the Y-axis, and the distance from the center of the arc to the theoretical center is δx, where δx > 0. The lower arc 3 forms the lower half of the elliptical bearing.
[0023] This results in an improved oil film stiffness compared to elliptical bearings. Compared to four-leaf bearings, the bearings of this embodiment have a higher load-bearing capacity while maintaining similar oil film stiffness.
[0024] In this embodiment, the rotating shaft 100 rotates within the inner hole formed by the upper left bearing arc 1, the upper right bearing arc 2, and the lower bearing arc 3. A dynamic pressure oil film can be formed in all three arcs, thereby suppressing the vibration of the rotating shaft 100 and ensuring smooth operation with minimal vibration. This novel sliding bearing features good high-speed stability, high rotational accuracy, and strong load-bearing capacity.
[0025] In this embodiment, the center of the arc of the upper left tile arc 1 does not coincide with the center of the arc of the upper right tile arc 2.
[0026] In the attached diagram, the radius of the upper left arc 1 is Rs, and the radius of the lower arc 3 is Rx.
[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A low-vibration sliding bearing for large motors, characterized in that: It consists of an upper left arc-shaped bearing block (10), an upper right arc-shaped bearing block (20), and a lower arc-shaped bearing block (30); The bottom left end of the upper left arc-shaped bearing (10) presses against the top left end of the lower arc-shaped bearing (30), and the bottom right end of the upper right arc-shaped bearing (20) presses against the top right end of the lower arc-shaped bearing (30). The pivot (100) is located between the inner walls of the upper left arc-shaped bearing (10), the upper right arc-shaped bearing (20), and the lower arc-shaped bearing (30). The lower arc-shaped bearing block (30) has an outwardly extending wall surface at both the left and right ends of its arc-shaped inner sidewall, forming an oil wedge (19) between it and the corresponding outer sidewall of the rotating shaft (100).
2. The low-vibration sliding bearing for a large motor according to claim 1, characterized in that: The right end face of the upper left arc-shaped bearing block (10) presses against the left end face of the upper right arc-shaped bearing block (20); An arc-shaped groove (11) is formed at the lower part of the right end face of the upper left arc-shaped bearing block (10), and an arc-shaped groove (11) is formed at the lower part of the left end face of the upper right arc-shaped bearing block (20). The two arc-shaped grooves (11) form an oil storage tank.
3. The low-vibration sliding bearing for a large motor according to claim 1, characterized in that: The inner wall of the upper left arc-shaped bearing block (10) is the upper left arc (1), and the inner wall of the upper right arc-shaped bearing block (20) is the upper right arc (2). The upper left arc (1) and the upper right arc (2) are symmetrically distributed along the vertical center line. The center of the arc of the upper left arc (1) is in the fourth quadrant and the angle between it and the X-axis is 45°.
4. The low-vibration sliding bearing for a large motor according to claim 1, characterized in that: The center of the arc of the lower arc (3) of the lower arc bearing block (30) is on the Y-axis.
5. A low-vibration sliding bearing for a large motor according to claim 3, characterized in that: The center of the arc of the upper left tile arc (1) does not coincide with the center of the arc of the upper right tile arc (2).