CN201068927Y - Ultra- light roller bearing - Google Patents

Abstract

The utility model relates to an ultra-light roller bearing, which comprises an inner ring, an outer ring, a retainer and a tapered roller. A, the ratio (D-d)/2D of the wall thickness and the outside diameter of the bearing is less than 0.1, the ratio I/D of the assembly height and the outside diameter is less than 0.1. B, the contact face of the inner ring and the outer ring and the tapered roller is a three-crowned design, the raceways of the inner ring and the outer ring are on the axis and are arched lines, and the two ends of the tapered roller is of a circular correction line. The ultra-light and ultra-thin design of the utility model can adapt to the use of non-standard design of the special engineering plant, the three-crowned design thereof can improve the stress situation of the contact area of the roller and a ferrule raceway, thereby enabling the stress distribute uniformly, effectively reducing the fringe effect, enabling the fatigue damage rate of the bearing reduce obviously and prolonging the service life of the product greatly. The utility model can be widely used in engineering plant, mining machine, petroleum machinery, metallurgical harbor transporting machinery, crane, motocrane, towering crane, etc. which relate to output terminal parts of a planetary reduction machine in hoisting and walking.

Description

The ultralight roller bearing

(1) technical field:

The utility model relates to the improvement of tapered roller bearing technology, particularly a kind of ultralight roller bearing.

(2) background technique:

At present NBS " tapered roller bearing boundary dimension global schema " (GB/T273.1-2003) in, the genus 32900 serial bearings that the lasso wall thickness is the thinnest, panel height is the narrowest, and in 32900 serial bearings, the ratio (D-d)/(2D)＞0.13 of its bearing wall thickness and external diameter, ratio T/D＞0.16 of the high and external diameter of bearing assembling.The bearing of this standard design, can not be suitable for some the particular design requirement in the engineering machinery, as the bearings mounted axle of the speed reducer in certain winch external diameter be: 196.85mm, width is 23mm, and thin, the narrowest the most approaching internal diameter of 32900 serial bearings is respectively among the like product GB GB/T273.1-2003 " tapered roller bearing boundary dimension global schema ": 190mm and 200mm, width is respectively: 45mm and 50mm can't supportingly with it install and use at all.On the other hand in existing tapered roller bearing, surface of contact between its inner ring, outer ring, the tapered roller three generally is designed to straight line in the axial direction, in the practice, owing to the machining accuracy reason, most can formation caved in, common tapered roller bearing extremely is easy to generate stress and concentrates in the work, causes decortication, pit, the working life of having reduced bearing.

(3) summary of the invention:

The purpose of this utility model is will solve existing GB bearing can't be suitable for some narrow problem in space, mechanical bearing installation position, and in order to improve the force-bearing situation of roller and lasso raceway contact area, make stress distribution even, reduce edge effect, improve working life, a kind of novel ultra-light roller bearing is provided.

Concrete scheme of the present utility model is: the ultralight roller bearing is made up of inner ring, outer ring, retainer and tapered roller, it is characterized in that: the ratio of its bearing wall thickness of a. and external diameter $\frac{D-d}{2D}<0.1,$ It assembles ratio high and external diameter $\frac{T}{D}<0.1;$ B. its inner ring, outer ring, tapered roller three's surface of contact is the designs of three convexitys, and promptly the roller surface of inside and outside circle is the arch camber line in the axial direction, and the tapered roller two ends are the circular arc modified line.

The utility model has solved the user and can't adopt the difficult problem of any a series of bearings in the GB because of the restriction in host design space under the prerequisite that guarantees the applied host machine performance, simultaneously, but the utility model economical with materials, reduces cost; In the utility model three is convexly equipped with the force-bearing situation that meter can improve roller and lasso raceway contact area, make stress distribution even, effectively reduce edge effect, make production reliability bring up to 99% by 59%, the bearing fatigue destructive rate obviously descends, and can increase substantially the working life of product.

(4) description of drawings:

Fig. 1 is a main sectional view of the present utility model;

Fig. 2 is a tapered roller plan view of the present utility model;

Fig. 3 is outer ring of the present utility model master's sectional view;

Fig. 4 is an inner ring master sectional view of the present utility model.

Among the figure: 1-outer ring, 2-tapered roller, 3-retainer, 4-inner ring, 5-outer ring raceway face, 6-inner ring raceway face.

(5) embodiment:

Example 1: a kind of ultralight roller bearing that is used for certain planetary speed reducer, the setting model is HS719, its structure is referring to Fig. 1, it is by outer ring 1, inner ring 4, retainer 3, and tapered roller 2 is formed, and its internal diameter is designed to 196.85mm, external diameter is 241.30mm, assembling highly is 23.812mm, and then this bearing wall thickness is 0.092 with the ratio of external diameter, and the high ratio with external diameter of assembling is 0.099.Particularly: in the present embodiment, inside and outside circle 4 and 1 roller surface 6 and 5 are designed to arch camber line (sagitta is 3-5 μ m) in the axial direction, referring to Fig. 4, Fig. 3; And circular arc modified line (convexity) is made at tapered roller 2 two ends, referring to Fig. 2, forms the design of three convexitys.

Example 2: setting model is HS720 ultralight roller bearing, and its structure is substantially with example 1, different designs be: its internal diameter is designed to 195mm, external diameter is 242mm, assembling highly is 23.7mm, and then this bearing wall thickness is 0.097 with the ratio of external diameter, and the high ratio with external diameter of assembling is 0.098.

Example 3: setting model is HS732 ultralight roller bearing, and its structure is substantially with example 1, different designs be: its internal diameter is designed to 177.8mm, external diameter is 215.9mm, assembling highly is 20.64mm, and then this bearing wall thickness is 0.088 with the ratio of external diameter, and the high ratio with external diameter of assembling is 0.096.

Claims (1)

1. ultralight roller bearing, it is made up of inner ring, outer ring, retainer and tapered roller, it is characterized in that: the ratio of its bearing wall thickness of a. and external diameter $\frac{D-d}{2D}<0.1,$ It assembles ratio high and external diameter $\frac{T}{D}<0.1;$ B. its inner ring, outer ring, tapered roller three's surface of contact is the designs of three convexitys, and promptly the roller surface of inside and outside circle is the arch camber line in the axial direction, and the tapered roller two ends are the circular arc modified line.

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