High-bearing-capacity slewing bearing with three rows of columns

Abstract

The utility model discloses a high-bearing three-row column slewing bearing which comprises an upper outer ring, a lower outer ring and an inner ring, an upper raceway is formed between the upper outer ring and the inner ring, a lower raceway is formed between the lower outer ring and the inner ring, and cylindrical rollers are mounted in the upper raceway and the lower raceway. An upper abutting surface and a lower abutting surface are respectively arranged on the abutting surface of the upper outer ring and the lower outer ring in the direction opposite to the inner ring, the upper abutting surface and the lower abutting surface form a first roller path, a second roller path is arranged at the position, opposite to the first roller path, of the inner ring, the first roller path and the second roller path form a middle roller path, and a rolling body is arranged in the middle roller path. The axial load and the radial load borne by the slewing bearing can be improved by arranging the crossed rollers in the middle roller path, the axial bearing capacity can be improved by arranging the steel balls, and the upper outer ring and the lower outer ring jointly bear the radial load through the upper abutting face and the lower abutting face.

Description

Technical Field

[0001] The utility model relates to a high-load-bearing three-row column slewing bearing. Background Art

[0002] Slewing bearing is a large combined bearing that needs to bear axial force, radial force and overturning moment at the same time. With the rapid development of the machinery industry, slewing bearings are widely used in many industries, such as wheeled cranes, metallurgical machinery, ship equipment, industrial machinery, etc. The existing three-row column slewing bearing generally includes an inner ring, an upper outer ring, and a lower outer ring. An upper raceway is formed between the upper outer ring and the inner ring, and a lower raceway is formed between the lower outer ring and the inner ring. Cylindrical rollers are installed in the upper raceway and the lower raceway. A middle raceway is formed between the relative abutment surfaces of the upper and lower outer rings, and cylindrical rollers are installed in the middle raceway. As the application field of slewing bearings becomes wider and wider, the required working conditions become more and more complex, especially under the working conditions of heavy axial loads. The existing three-row column structure cannot meet the requirements of specific working conditions. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-load-bearing three-row column slewing bearing to improve the performance of the slewing bearing in bearing axial loads and radial loads, thereby improving the overall load-bearing capacity.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-load-bearing three-row column slewing bearing, comprising an upper outer ring, a lower outer ring, and an inner ring, an upper raceway is formed between the upper outer ring and the inner ring, a lower raceway is formed between the lower outer ring and the inner ring, cylindrical rollers are installed in the upper raceway and the lower raceway, upper abutting surfaces and lower abutting surfaces are respectively provided in the direction relative to the inner ring where the upper outer ring and the lower outer ring abut against each other, the upper abutting surfaces and the lower abutting surfaces form a first raceway, the inner ring is provided with a second raceway at a position relative to the first raceway, the first raceway and the second raceway form a middle raceway, and rolling bodies are installed in the middle raceway.

[0005] As a further improvement of the utility model, cylindrical rollers are installed in the middle raceway, and the cylindrical rollers are arranged perpendicularly and crosswise to each other at 90 degrees.

[0006] As a further improvement of the present invention, steel balls are installed in the middle raceway, the steel balls are in four-point contact and are fully loaded in the middle raceway.

[0007] As a further improvement of the utility model, a sealing ring is provided between the upper outer ring and the lower outer ring relative to the inner ring, one side of the sealing ring is provided with an annular protrusion, and the other side thereof is provided with a first sealing lip, a second sealing lip, and a third sealing lip, and the two sides of the sealing ring are respectively abutted against the surfaces of the upper outer ring, the lower outer ring and the inner ring relative to each other.

[0008] As a further improvement of the utility model, the upper outer ring and the lower outer ring are provided with annular grooves for the annular protrusion to be inserted through interference, and the inner ring is provided with a groove for the first sealing lip and the second sealing lip to be in interference contact.

[0009] As a further improvement of the utility model, the upper outer ring is provided with a plurality of bolts arranged along its radial direction for fixing and connecting with the lower outer ring.

[0010] The beneficial effects of the utility model are as follows: arranging cross rollers in the middle raceway can improve the slewing bearing's ability to withstand axial and radial loads, arranging steel balls can improve the axial bearing capacity, and the upper abutment surface and the lower abutment surface enable the upper outer ring and the lower outer ring to jointly bear the radial load. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0012] Figure 2 This is a schematic diagram of the overall structure of another embodiment of the present utility model;

[0013] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0014] Figure 4 for Figure 1 Enlarged view of point B in the middle;

[0015] Figure 5 for Figure 2 Enlarged view of center C.

[0016] Figure numbers: 1, upper outer ring; 2, lower outer ring; 3, inner ring; 4, upper raceway; 5, lower raceway; 6, upper abutment surface; 7, lower abutment surface; 8, first raceway; 9, second raceway; 10, steel ball; 11, sealing ring; 12, annular protrusion; 13, first sealing lip; 14, second sealing lip; 15, third sealing lip; 16, annular groove; 17, groove. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0018] Reference Figure 1-5As shown, a high-load three-row column slewing bearing comprises an upper outer ring 1, a lower outer ring 2 and an inner ring 3, the inner ring is provided with a rack connected to the outside for transmission, an upper raceway 4 is formed between the upper outer ring 1 and the inner ring 3, a lower raceway 5 is formed between the lower outer ring 2 and the inner ring 3, cylindrical rollers are installed in the upper raceway 4 and the lower raceway 5, upper abutting surfaces 6 and lower abutting surfaces 7 are respectively provided in the direction relative to the inner ring 3 where the upper outer ring 1 and the lower outer ring 2 abut against each other, the upper abutting surfaces 6 and the lower abutting surfaces 7 form a first raceway 8, the inner ring 3 is provided with a second raceway 9 at a position relative to the first raceway 8, the first raceway 8 and the second raceway 9 form a middle raceway, rolling elements are installed in the middle raceway, and in actual applications, the middle raceway can be adjusted according to the load conditions. The contact surface of the upper abutment surface 6 or the lower abutment surface 7 is adjusted according to the situation, so that the upper abutment surface 6 or the lower abutment surface 7 increases or decreases the contact surface with the rolling body to carry out unbalanced load. In this embodiment, the upper abutment surface 6 and the lower abutment surface 7 of the upper outer ring 1 and the lower outer ring 2 are arranged in the same way so that the upper outer ring 1 and the lower outer ring 2 bear the same load force. Cylindrical rollers are installed in the middle raceway, and the cylindrical rollers are arranged perpendicularly to each other at 90°. This arrangement enables it to carry axial loads and radial loads at the same time, and improves the overall load-bearing capacity of the slewing bearing. In another embodiment, the rolling body is a steel ball 10, and the steel ball 10 is in four-point contact and the steel ball 10 is fully loaded in the middle raceway. The slewing bearing is arranged in this way to withstand higher axial loads.

[0019] A sealing ring 11 is provided between the upper outer ring 1 and the lower outer ring 2 relative to the inner ring 3. An annular protrusion 12 is provided on one side of the sealing ring 11, and a first sealing lip 13, a second sealing lip 14, and a third sealing lip 15 are provided on the other side. Both sides of the sealing ring 11 are respectively abutted against the surfaces of the upper outer ring 1, the lower outer ring 2 and the inner ring 3 relative to each other. An annular groove 16 for interference insertion of the annular protrusion 12 is provided on the upper outer ring 1 and the lower outer ring 2. The annular protrusion 12 forms a right angle with the sealing ring 11. The inner ring 3 is provided with a groove 17 for interference fit between the first sealing lip 13 and the second sealing lip 14. In this embodiment, the positions of the groove 16 of the lower outer ring 2 and the groove 17 of the inner ring 3 are interchanged, that is, the groove 17 is provided on the lower outer ring 2 and the groove 16 is provided on the inner ring 3. The upper outer ring 1 is provided with a plurality of bolts for fixing the lower outer ring 2 along its radial direction. The upper outer ring 1 and the lower outer ring 2 are fixedly connected by a plurality of bolts so that the overall connection is tight.

[0020] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-load three-row column slewing bearing, comprising an upper outer ring, a lower outer ring, and an inner ring, wherein an upper raceway is formed between the upper outer ring and the inner ring, and a lower raceway is formed between the lower outer ring and the inner ring, wherein cylindrical rollers are installed in both the upper raceway and the lower raceway, and characterized in that: An upper abutting surface and a lower abutting surface are respectively provided in the direction relative to the inner ring where the upper outer ring abuts against the lower outer ring. The upper abutting surface and the lower abutting surface form a first raceway. A second raceway is provided at a position of the inner ring relative to the first raceway. The first raceway and the second raceway form a middle raceway in which rolling bodies are installed.

2. The high-load-bearing three-row column slewing bearing according to claim 1, characterized in that: Cylindrical rollers are installed in the middle raceway, and the cylindrical rollers are arranged perpendicularly and crosswise to each other at 90 degrees.

3. The high-load-bearing three-row column slewing bearing according to claim 1, characterized in that: Steel balls are installed in the middle raceway, the steel balls are in four-point contact and the steel balls are fully installed in the middle raceway.

4. The high-load-bearing three-row column slewing bearing according to claim 2 or 3, characterized in that: A sealing ring is provided between the upper outer ring and the lower outer ring relative to the inner ring. An annular protrusion is provided on one side of the sealing ring, and a first sealing lip, a second sealing lip and a third sealing lip are provided on the other side. Both sides of the sealing ring are respectively in contact with the surfaces of the upper outer ring, the lower outer ring and the inner ring relative to each other.

5. The high-load-bearing three-row column slewing bearing according to claim 4, characterized in that: The upper outer ring and the lower outer ring are provided with annular grooves for the annular protrusion to be inserted through interference, and the inner ring is provided with a groove for the first sealing lip and the second sealing lip to be in interference contact.

6. The high-load-bearing three-row column slewing bearing according to claim 1, characterized in that: The upper outer ring is provided with a plurality of bolts arranged along its radial direction for fixing and connecting with the lower outer ring.

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