Self-elastic pre-tightening turntable bearing structure

Abstract

The utility model belongs to the technical field of bearing production and processing, and particularly relates to an elastic pre-tightening turntable bearing structure which comprises an outer ring, an inner ring and a rolling body, the outer ring is sleeved outside the inner ring, and the rolling body is arranged between the inner ring and the outer ring; the inner ring comprises an upper half inner ring and a lower half inner ring which are correspondingly arranged up and down, and the center of each of the upper half inner ring and the lower half inner ring is of a through hole structure; the through hole of the upper half inner ring is of a counter bore structure; a reamed hole is formed in the lower part of the through hole of the lower half inner ring; and an elastic pre-tightening component is arranged in the through hole of the upper half inner ring. The utility model has the advantages of simple structure, low processing difficulty, low manufacturing cost and strong stability; the elastic pre-tightening component is arranged at the inner ring of the bearing, so that when the clearance of the bearing is reduced due to temperature rise, the elastic pre-tightening component ensures stable zero clearance and pre-tightening force, the phenomena of clamping stagnation and locking of the bearing are prevented, the stability of system rigidity is also ensured, the service life of the bearing is prolonged, and the production safety is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of bearing manufacturing and processing technology, specifically relating to a structure of a turntable bearing with built-in elastic preload. Background Technology

[0002] The structure of a commonly used four-point contact ball slewing bearing is shown in the attached diagram. Figure 3 As shown in the diagram, bearings typically have clearance. When a bearing is subjected to axial load, the load is transferred from the upper end of the outer ring through the outer ring raceway, rolling elements, inner ring raceway, and lower end of the inner ring to the bearing housing. At this time, the outer ring raceway, rolling elements, and inner ring raceway are in close contact. Due to the bearing clearance, the outer ring raceway, rolling elements, and inner ring raceway are not in contact. When the bearing is subjected to a large overturning moment in addition to a simple axial load, one side of the bearing will maintain the outer ring raceway, rolling elements, and inner ring raceway in close contact, while the other side will quickly switch from maintaining the outer ring raceway, rolling elements, and inner ring raceway in close contact to maintaining the outer ring raceway, rolling elements, and inner ring raceway in close contact. This causes the forces on the two sides of the bearing to be opposite to resist the external overturning moment load. This transition will cause the bearing's central axis to deflect at an angle when clearance exists. In some applications, it is necessary to minimize this deflection. Of course, this can be addressed by machining and assembling the bearing with negative clearance during production. However, since negative clearance is a fixed value at the factory, the load and operating temperature of the bearing change during operation. These changes will cause the negative clearance value to fluctuate, resulting in changes in the rigidity of the bearing system and changes in the operating friction torque. If not properly adjusted, it can cause jamming or even seizure, which not only affects the service life of the bearing, but also poses safety hazards to production if the equipment uses the bearing for a long time. Utility Model Content

[0003] The purpose of this invention is to overcome the problem that existing turntable bearings may jam or even seize when the clearance decreases due to temperature rise. This not only affects the service life of the bearing, but also poses a safety hazard to production if the equipment uses the bearing for a long time.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A self-elastic preloaded turntable bearing structure includes an outer ring, an inner ring, and rolling elements. The outer ring is sleeved outside the inner ring, and the rolling elements are disposed between the inner and outer rings. The inner ring includes an upper half and a lower half of the inner ring, which are arranged vertically and vertically, and the center of both the upper and lower half of the inner ring has a through hole structure. The through hole of the upper half of the inner ring is a countersunk hole structure. The lower part of the through hole of the lower half of the inner ring is a reamed hole. An elastic preload component is disposed in the through hole of the upper half of the inner ring.

[0006] The elastic preload component includes a hollow capped threaded sleeve, a bolt, a spring, and a washer; the hollow capped threaded sleeve passes through the central through hole of the upper and lower inner rings, and the spring is sleeved on the upper part of the hollow capped threaded sleeve, with the washer located at the end of the spring.

[0007] The thread of the lower half of the hollow capped threaded sleeve passes through the reamed hole of the lower half of the upper inner ring and is tightened and fixed to the lower inner ring, pressing the spring and washer into the countersunk hole of the upper inner ring.

[0008] The bolt passes through the hollow capped nut sleeve, and the hollow capped nut sleeve and the lower inner ring are pressed and fixed to the base set at the bottom by the bolt.

[0009] The upper edge of the hollow capped threaded sleeve is provided with a rubber seal.

[0010] The spring is a compression spring and has elasticity in both the stretching and compression directions.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the utility model has a simple structure, low processing difficulty, low manufacturing cost, and strong stability; by setting an elastic preload component at the inner ring of the bearing, when the bearing clearance decreases due to temperature rise, the elastic preload component ensures stable zero clearance and preload force, preventing the bearing from jamming and seizing, ensuring the stability of system rigidity, extending the bearing service life, and ensuring production safety. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is an isometric view of the hollow capped screw sleeve of this utility model;

[0014] Figure 3 This is a diagram illustrating existing technology.

[0015] In the diagram: 1. Outer ring, 2. Inner ring, 3. Upper half of the inner ring, 4. Lower half of the inner ring, 5. Hollow capped nut insert, 6. Bolt, 7. Spring, 8. Washer, 9. Rolling element, 10. Base, 11. Rubber seal. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] like Figures 1-2As shown, a self-elastic preloaded turntable bearing structure includes an outer ring 1, an inner ring 2, and rolling elements. The outer ring 1 is sleeved outside the inner ring 2, and the rolling elements are disposed between the inner ring 2 and the outer ring 1. The inner ring 2 includes an upper inner ring 3 and a lower inner ring 4 arranged vertically, and the center of both the upper inner ring 3 and the lower inner ring 4 is a through hole structure. The through hole of the upper inner ring 3 is a countersunk hole structure. The lower part of the through hole of the lower inner ring 4 is a reamed hole. An elastic preload component is disposed in the through hole of the upper inner ring 3.

[0018] The elastic preload component includes a hollow capped threaded sleeve 5, a bolt 6, a spring 7, and a washer 8. The hollow capped threaded sleeve 5 passes through the central through hole of the upper inner ring 3 and the lower inner ring 4, and the spring 7 is sleeved on the upper part of the hollow capped threaded sleeve 5. The washer 8 is located at the end of the spring 7. The spring 7 is a compression spring and has elasticity in both the tensile and compressive directions. Here, the upper inner ring 3 is a floating upper inner ring, which can float up and down along the outer diameter of the hollow capped threaded sleeve 5 through the reamed hole and the outer diameter of the hollow capped threaded sleeve 5, in order to stabilize zero clearance and preload force and prevent the bearing from jamming or seizing.

[0019] The thread of the lower half of the hollow capped threaded sleeve 5 passes through the reamed hole of the lower half of the upper inner ring 3 and is tightened and fixed to the lower inner ring 4, pressing the spring 7 and the washer 8 into the countersunk hole of the upper inner ring 3; the preload of the floating upper inner ring 3 is provided by the spring 7, and the washer 8 plays a role in fine-tuning the preload. Since the floating upper inner ring 3 will have a slight displacement in the vertical direction of the hollow capped threaded sleeve 5 during operation, it is used to stabilize zero clearance and preload; the bolt 6 passes through the hollow capped threaded sleeve 5 and presses and fixes the hollow capped threaded sleeve 5 and the lower inner ring 2 onto the base 10 set at the bottom through the bolt 6; a rubber seal 11 is provided on the upper edge of the hollow capped threaded sleeve 5, which can prevent foreign objects from entering the countersunk hole of the upper inner ring 3.

[0020] In practical use, this invention utilizes an elastic preload component located at the inner ring of the bearing. The thread of the lower half of the hollow capped sleeving 5 passes through the reamed hole in the lower half of the upper inner ring 3 and is tightened and fixed to the lower inner ring 4. The spring 7 and washer 8 are pressed into the countersunk hole of the upper inner ring 3. This allows the upper inner ring 3 to move up and down along the outer diameter of the hollow capped sleeving 5 through the reamed hole, stabilizing the zero clearance and preload, preventing bearing jamming and seizing. When the bearing clearance decreases due to temperature rise, the elastic preload component ensures stable zero clearance and preload, preventing bearing jamming and seizing, maintaining system rigidity, extending bearing life, and ensuring production safety. This structure can also be applied to four-point contact ball slewing bearings, crossed cylindrical slewing bearings, double-row unequal diameter ball slewing bearings, and three-row cylindrical slewing bearings to improve system rigidity.

[0021] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A self-elastic preloaded turntable bearing structure, comprising an outer ring (1), an inner ring (2), and rolling elements (9), wherein the outer ring (1) is sleeved outside the inner ring (2), and the rolling elements are disposed between the inner ring (2) and the outer ring (1); characterized in that: The inner ring (2) includes an upper half inner ring (3) and a lower half inner ring (4) arranged correspondingly above and below each other, and the center of the upper half inner ring (3) and the lower half inner ring (4) are both through holes; the through hole of the upper half inner ring (3) is set as a countersunk hole; the lower part of the through hole of the lower half inner ring (4) is set as a reamed hole; an elastic pre-tightening component is provided in the through hole of the upper half inner ring (3).

2. The self-elastic preloaded turntable bearing structure according to claim 1, characterized in that: The elastic preload component includes a hollow capped threaded sleeve (5), a bolt (6), a spring (7), and a washer (8); the hollow capped threaded sleeve (5) passes through the central through hole of the upper half inner ring (3) and the lower half inner ring (4), and the spring (7) is sleeved on the upper part of the hollow capped threaded sleeve (5), and the washer (8) is located at the end of the spring (7).

3. The self-elastic preloaded turntable bearing structure according to claim 2, characterized in that: The thread of the lower half of the hollow capped nut sleeve (5) passes through the reamed hole of the lower half of the upper inner ring (3) and is tightened and fixed in the lower inner ring (4), and the spring (7) and washer (8) are pressed into the countersunk hole of the upper inner ring (3).

4. The self-elastic preloaded turntable bearing structure according to claim 2, characterized in that: The bolt (6) is inserted into the hollow capped nut sleeve (5), and the hollow capped nut sleeve (5) and the lower inner ring (4) are pressed and fixed on the base (10) provided at the bottom by the bolt (6).

5. The self-elastic preloaded turntable bearing structure according to claim 2, characterized in that: The upper edge of the hollow capped threaded sleeve (5) is provided with a rubber seal (11).

6. The self-elastic preloaded turntable bearing structure according to claim 2, characterized in that: The spring (7) is a compression spring and has elasticity in both the stretching and compression directions.

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