CN102562793A - Crossed roller and four-point sphere combined high-accuracy heavy-load slewing bearing - Google Patents

Abstract

A high-precision heavy-duty slewing bearing combined with crossed rollers and four-point balls. It is provided with an outer ring, an inner ring and a sealing ring. The raceway consists of the upper raceway Ⅰ and the lower raceway Ⅱ. There are steel balls in the raceway Ⅰ. The raceway Ⅰ is an arc-shaped raceway. The radius of curvature of the arc of the raceway Ⅰ is 0.55 times the diameter of the steel ball. , A spacer is set between every two steel balls in the raceway I, a crossed cylindrical roller is set in the raceway II, and a spacer is set between every two cylindrical rollers. The bearing has the advantages of compact structure, high rotation precision, high bearing capacity, long life, convenient installation, easy maintenance and saving installation space.

Description

A high-precision heavy-duty slewing bearing combined with crossed rollers and four-point balls

the

technical field

The invention relates to a turntable bearing, in particular to a high-precision heavy-duty turntable bearing combined with cross rollers and four-point balls.

Background technique

Because it can withstand large axial loads, radial loads and overturning moments at the same time, slewing bearings are widely used in rotary equipment such as construction machinery, solar power generation devices, excavator rotary bucket devices, and aerial work platform vehicle devices. Common slewing bearings are divided into internal gear type, external gear type and gearless type according to the driving form; according to the rolling element structure, they are divided into single and double row four-point contact ball slewing bearings, three-row roller slewing bearings, and ball/column combination slewing bearings.

Four-point contact ball slewing bearings can withstand high axial loads, radial loads and overturning moments, are easy to process to meet high-precision slewing requirements, and can better prepare negative clearances. The cylindrical rollers inside the single-row crossed roller bearing are vertically arranged on the 90° V-groove rolling surface through spacers. This design enables the crossed roller bearing to withstand large radial loads, Loads in all directions such as axial loads and moment loads. Due to the linear contact between the roller and the raceway, it can bear a relatively large load and meet the requirements of heavy load. In the current slewing bearings, three-row combined roller slewing bearings are often used for heavy loads, and the rotation accuracy is insufficient; for ball/column combination slewing bearings, one row of four-point contact balls is relied on to ensure its rotation accuracy, and the other row of cylindrical rollers is used to ensure the rotation accuracy. The sub-bearing bears its axial load, but the radial load is completely borne by the ball, and early fatigue failure between the steel ball and the raceway often occurs during use.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of the above technical problems, to provide a high-precision heavy-duty slewing bearing combined with crossed rollers and four-point balls, which has the advantages of compact structure, high rotation precision, high bearing capacity, long life, convenient installation, The advantages of easy maintenance and saving installation space.

In order to solve the deficiencies of the above-mentioned technical problems, the technical solution adopted by the present invention is: a high-precision heavy-duty slewing bearing combined with cross rollers and four-point balls, which is provided with an outer ring, an inner ring and a sealing ring. Two rows of parallel raceways are set between the outer diameter surface and the inner diameter surface of the outer ring. The upper raceway I and the lower raceway II are equipped with steel balls in the raceway I. The raceway I is an arc-shaped raceway. , the radius of curvature of the arc of the raceway I is 0.55 times the diameter of the steel balls, there are spacers between every two steel balls in the raceway I, and cross cylindrical rollers are set in the raceway II, every two There are spacers between the two cylindrical rollers.

The end faces of the outer ring and the inner ring are provided with threaded holes along the axial direction.

The beneficial effects of the present invention are:

In the present invention, two rows of parallel raceways are arranged between the inner and outer rings, and steel balls are arranged in the upper row of raceways. The upper row of raceways is an arc raceway, and the radius of curvature of the arc is 0.55 of the diameter of the steel ball. times, under this parameter, the bearing is guaranteed to have extremely high rotation accuracy, and the service life under heavy load is increased by more than 30%. And there are crossed cylindrical rollers in the lower row of raceways. The rollers are arranged vertically and crossed at 90°, which can bear large axial and radial loads at the same time. The spacer between the rollers prevents the rollers from tilting and The mutual friction between the rollers effectively prevents the increase of the turning moment, and avoids the phenomenon of contact or locking of one side of the rollers; the size of the inner and outer rings is minimized, especially the ultra-thin structure; especially the bearing capacity characteristics protrude. In addition, the processing accuracy of the double straight raceway is also good. Experiments have proved that the rigidity of this type of bearing is 3~4 times higher than that of the original structure of the slewing bearing, which greatly improves its carrying capacity.

The present invention is a specialized slewing bearing designed for heavy-duty high-precision slewing equipment. The pre-tightened four-point contact ball structure with negative clearance is used to ensure high-precision slewing, and the cross rollers are used to simultaneously bear radial and axial heavy loads. .

Description of drawings

Fig. 1 is a structural sectional view of the present invention;

Reference signs: 1, outer ring, 2, inner ring, 3, sealing ring, 4, raceway I, 5, raceway II, 6, steel ball, 7, crossed cylindrical roller. the

Detailed ways

As shown in the figure, a high-precision heavy-duty slewing bearing combined with crossed rollers and four-point balls is equipped with an outer ring 1, an inner ring 2 and a sealing ring 3, and the sealing ring 3 is set at the joint between the inner ring and the outer ring. At both ends, two rows of parallel raceways are set between the outer diameter surface of the inner ring 2 and the inner diameter surface of the outer ring 1, the upper raceway I4 and the lower raceway II5, the raceway I4 and the raceway II5 are in the bearing The axial direction is arranged at intervals, and steel balls 6 are arranged in the raceway I4. The raceway I4 is an arc-shaped raceway formed by two arc-shaped surfaces facing each other. The radius of curvature of the arc of the raceway I4 is 0.55 of the diameter of the steel ball. times, the contact angle is 45 degrees, this structure makes the bearing in a pre-tightened state after the steel balls are installed, and improves the rotation accuracy. There is an isolation block between every two steel balls in the raceway I, and the The isolation block has a ball-and-socket structure, and there are cross cylindrical rollers 7 in the raceway II5. The raceway II is a straight line raceway that intersects vertically. All are provided with isolation blocks, and cylindrical pocket structures are provided on the isolation blocks between the cross rollers.

The end faces of the inner ring and the outer ring are provided with threaded holes along the axial direction for easy installation. When the bearing is working, the teeth on the inner and outer rings are meshed with the gear or driven by the shaft to drive the inner ring or the outer ring to rotate; when the bearing rotates , the two rows of rolling elements rotate around their own axes respectively, and the rotation process realizes the revolution of the rolling elements around the center of the bearing; the rolling elements are separated by spacers to prevent mutual friction between the rolling elements and prevent the cylindrical rollers from Skewing occurs during operation.

According to different driving forms, the inner diameter of the inner ring and the outer diameter of the outer ring can be with or without teeth. There are also oil injection holes on the outer cylindrical surface of the bearing outer ring. The oil injection holes are arranged in two rows. It is connected with the raceway I, and the oil injection hole in the lower layer is connected with the raceway II. Each row of oil injection holes is arranged on the outer circumferential surface of the outer ring at an interval of 90 degrees, and the interval between the upper and lower rows of oil injection holes is 180 degrees.

Claims (2)

1. one kind intersects the high precision overloading turntable bearing of roller and four penalty kicks combination; It is characterized in that: be provided with outer ring (1), inner ring (2) and seal ring (3); The two rows raceway that is parallel to each other is set between the aperture surface of the outer diametric plane of inner ring (2) and outer ring (1); By the raceway I (4) on top and the raceway II (5) of bottom, in raceway I (4), be provided with steel ball (6), raceway I (4) is an arcuate groove; The radius of curvature of the circular arc of raceway I (4) is 0.55 times of steel ball (6) diameter; In raceway I (4), be equipped with spacing block between per two steel balls, in raceway II (5), be provided with crossing cylinder roller (7), be equipped with spacing block between per two cylindrical rollers.

2. a kind of high precision overloading turntable bearing that intersects the combination of roller and four penalty kicks according to claim 1, it is characterized in that: the end face of (1) and inner ring (2) is equipped with tapped hole vertically in the outer ring.

Images