CN212868173U

CN212868173U - Four-point contact ball bearing for CT machine

Info

Publication number: CN212868173U
Application number: CN202021916282.7U
Authority: CN
Inventors: 刘许; 姚义峰; 林国福; 石永; 杨哲; 陈云
Original assignee: Luoyang Bearing Holding Co Ltd
Current assignee: Luoyang Bearing Holding Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-04-02
Anticipated expiration: 2030-09-04

Abstract

A four-point contact ball bearing for a CT machine comprises an outer ring, a retainer, balls and an inner ring, wherein the outer ring is arranged outside the inner ring, the retainer is arranged between the outer ring and the inner ring, and the balls are uniformly arranged in the retainer between the outer ring and the inner ring; the inner ring is composed of an inner ring half part A and an inner ring half part B which have the same inner and outer diameters, the inner ring half part A and the inner ring half part B are both of circular ring structures, the inner ring half part B is arranged at the lower part of the inner ring half part A, and the inner ring half part A and the inner ring half part B are coaxially arranged; the utility model adopts the above technical scheme, good effect has been gained: four-point contact ball bearing for CT machine has guaranteed the axiality and the precision of inner circle channel after half A of inner circle and half B of inner circle installation through set up taper pin and tang between half A of inner circle and half B of inner circle, has guaranteed the facility of installation simultaneously, the utility model discloses simple structure, low cost, the in-service use is respond well.

Description

Four-point contact ball bearing for CT machine

Technical Field

The utility model relates to a bearing technical field especially relates to a four-point contact ball bearing for CT machine.

Background

The main shaft bearing of the CT machine has the characteristics of high precision and high rotating speed, requires small starting friction torque, high rotating precision, low running noise and small vibration amplitude, and requires higher reliability and stability. Because of the assembly space limitation of a certain type of CT machine, the bearing structure is designed into a single-row four-point contact ball bearing, an inner ring adopts a split structure and is formed by connecting two half inner rings by bolts, and the concentricity of the two half inner rings after the roller paths are connected is ensured by a spigot structure; however, radial and axial deflection occurs when the two half-part inner rings are connected, the error of the concentricity of the raceways of the two half-part inner rings is large, the moment of the bearing is out of tolerance, the phenomena of clamping stagnation and stopping may occur during rotation, abnormal phenomena such as noise value and vibration value out of tolerance, abnormal sound and uneven stress of the motor even occur when the CT machine runs, and the shutdown event can occur in severe cases.

SUMMERY OF THE UTILITY MODEL

The utility model provides a four point contact ball bearing for CT machine for solve above-mentioned problem.

The purpose of the utility model is realized by adopting the following technical scheme:

a four-point contact ball bearing for a CT machine comprises an outer ring, a retainer, balls and an inner ring, wherein the outer ring is arranged outside the inner ring, the retainer is arranged between the outer ring and the inner ring, and the balls are uniformly arranged in the retainer between the outer ring and the inner ring; the inner ring is composed of an inner ring half part A and an inner ring half part B which have the same inner and outer diameters, the inner ring half part A and the inner ring half part B are both of circular ring structures, the inner ring half part B is arranged at the lower part of the inner ring half part A, the inner ring half part A and the inner ring half part B are coaxially arranged, an inwards concave rectangular groove A is arranged at the outer circle connecting part of the inner ring half part A and the inner ring half part B, and a semicircular inner ring channel is arranged in the middle of the groove; two conical through holes which vertically penetrate through the inner ring half part A and the inner ring half part B are symmetrically arranged on the upper surface of the inner ring half part A in a left-right mode, conical pins are arranged in the conical through holes, and the conical pins and the conical through holes are manufactured in a matched mode; the outer side of the conical through hole on the inner ring half part A is evenly provided with an installation counter bore with a vertical axis, a bolt is arranged in the installation counter bore, a threaded hole is arranged on the upper surface of the inner ring half part B and corresponds to the counter bore on the inner ring half part A, and the threaded hole is installed in a matched mode with the external thread on the lower portion of the bolt.

The inner side of the joint surface of the inner ring half part A and the inner ring half part B is provided with annular rabbets which are matched with each other.

The outer ring is a circular ring-shaped ferrule, a rectangular groove B is arranged in the middle of an inner hole of the outer ring, an inwards-concave semicircular outer ring channel is arranged at the bottom of the rectangular groove B, and a distance is kept between the inner hole of the outer ring and the outer circle of the inner ring.

The retainer is of an annular structure, pockets are uniformly arranged on the retainer, and gaps are kept between the retainer and the outer circles of the rectangular groove B of the outer ring and the rectangular groove A of the inner ring.

The ball is arranged in the pocket of the retainer, the inner side of the ball is in contact with the inner ring channel on the outer side of the inner ring, and the outer side of the ball is in contact with the outer ring channel on the inner side of the outer ring.

The utility model adopts the above technical scheme, good effect has been gained: four-point contact ball bearing for CT machine has guaranteed the axiality and the precision of inner circle channel after half A of inner circle and half B of inner circle installation through set up taper pin and tang between half A of inner circle and half B of inner circle, has guaranteed the facility of installation simultaneously, the utility model discloses simple structure, low cost, the in-service use is respond well.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of fig. 1.

In the figure: 1. the bearing comprises an outer ring, 2, a retainer, 3, balls, 4-1, inner ring half parts A, 4-2, inner ring half parts B, 4-3, a taper pin, 4-4, a bolt, 4-5 and a spigot.

Detailed Description

The present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 and 2, the four-point contact ball bearing for CT machine comprises an outer ring 1, a retainer 2, balls 3 and an inner ring; the inner ring is composed of an inner ring half part A4-1 and an inner ring half part B4-2 which have the same inner and outer diameters, the inner ring half part A4-1 and the inner ring half part B4-2 are both circular structures, the inner ring half part B4-2 is arranged at the lower part of the inner ring half part A4-1, the inner ring half part A4-1 and the inner ring half part B4-2 are coaxially arranged, an inwards concave rectangular groove A is arranged at the excircle connecting part of the inner ring half part A4-1 and the inner ring half part B4-2, and a semicircular inner ring channel is arranged in the middle of the bottom of the rectangular; two conical through holes which vertically penetrate through the inner ring half part A and the inner ring half part B are symmetrically arranged on the left and right of the upper surface of the inner ring half part A4-1, a conical pin 4-3 is arranged in each conical through hole, and the conical pin 4-3 is manufactured by matching with each conical through hole; mounting counter bores with vertical axes are uniformly arranged on the outer sides of the conical through holes on the inner ring half part A4-1, bolts 4-4 are arranged in the mounting counter bores, threaded holes are arranged on the inner ring half part B4-2 and at positions corresponding to the counter bores on the inner ring half part A4-1, and the threaded holes are matched with external threads on the lower part of the bolts 4-4 for mounting; the inner sides of the combining surfaces of the inner ring half part A4-1 and the inner ring half part B4-2 are provided with annular spigots 4-5 which are mutually matched and installed;

the outer ring 1 is arranged on the outer side of the inner ring, the outer ring 1 is a circular ring-shaped ferrule, a rectangular groove B is arranged in the middle of an inner hole of the outer ring 1, an inwards-concave semicircular outer ring channel is arranged at the bottom of the rectangular groove B, and a distance is kept between the inner hole of the outer ring 1 and the excircle of the inner ring; the retainer 2 is arranged between the outer ring 1 and the inner ring, the retainer 2 is of an annular structure, pockets are uniformly arranged on the retainer 2, and gaps are kept between the retainer 2 and the outer circles of the rectangular groove B of the outer ring 1 and the rectangular groove A of the inner ring; the balls 3 are uniformly arranged in the retainer 2 between the outer ring 1 and the inner ring, the balls 3 are arranged in a pocket of the retainer 2, the inner sides of the balls 3 are in contact with an inner ring channel on the outer side of the inner ring, and the outer sides of the balls 3 are in contact with an outer ring channel on the inner side of the outer ring 1.

When the four-point contact ball bearing for the CT machine is installed, firstly, bolts of an inner ring half part A4-1 and an inner ring half part B4-2 of an inner ring are taken off and disassembled, the inner ring half part A4-1 and the inner ring half part B4-2 are combined after the inner ring half part A4-1 and the inner ring half part B4-2 are adjusted in place on the CT machine, a taper pin 4-3 is installed in a taper through hole of the inner ring half part A4-1 and the inner ring half part B4-2, after the two half parts of the inner ring are accurately positioned, the inner ring half part A4-1 and the inner ring half part B4-2 are connected through the bolts 4-4, the bearing installation is completed.

The part of the utility model not detailed is prior art.

Claims

1. The utility model provides a four point contact ball bearing for CT machine, includes outer lane (1), keeps ware (2), ball (3) and inner circle, characterized by: the outer ring (1) is arranged on the outer side of the inner ring, the retainer (2) is arranged between the outer ring (1) and the inner ring, and the balls (3) are uniformly arranged in the retainer (2) between the outer ring (1) and the inner ring; the inner ring is composed of an inner ring half part A (4-1) and an inner ring half part B (4-2) which have the same inner and outer diameters, the inner ring half part A (4-1) and the inner ring half part B (4-2) are both of circular ring structures, the inner ring half part B (4-2) is arranged at the lower part of the inner ring half part A (4-1), the inner ring half part A (4-1) and the inner ring half part B (4-2) are coaxially arranged, an inwards concave rectangular groove A is arranged at the excircle joint of the inner ring half part A (4-1) and the inner ring half part B (4-2), and a semicircular inner ring channel is arranged in the middle of the bottom of the rectangular groove; two conical through holes which vertically penetrate through the inner ring half part A (4-1) and the inner ring half part B (4-2) are arranged on the upper surface of the inner ring half part A (4-1) in a bilateral symmetry manner, a conical pin (4-3) is arranged in each conical through hole, and the conical pin (4-3) and each conical through hole are manufactured in a matching manner; the outer side of the conical through hole on the inner ring half part A (4-1) is uniformly provided with mounting counter bores with vertical axes, bolts (4-4) are arranged in the mounting counter bores, threaded holes are arranged on the inner ring half part B (4-2) and correspond to the counter bores on the inner ring half part A (4-1), and the threaded holes are matched and mounted with external threads on the lower part of the bolts (4-4).

2. The four-point contact ball bearing for CT machine of claim 1, wherein: the inner side of the combining surface of the inner ring half part A (4-1) and the inner ring half part B (4-2) is provided with annular rabbets (4-5) which are mutually matched and installed.

3. The four-point contact ball bearing for CT machine of claim 1, wherein: the outer ring (1) is a circular ring-shaped ferrule, a rectangular groove B is formed in the middle of an inner hole of the outer ring (1), an inwards-concave semicircular outer ring (1) channel is formed in the bottom of the rectangular groove B, and a distance is kept between the inner hole of the outer ring (1) and the outer circle of the inner ring.

4. The four-point contact ball bearing for CT machine of claim 1, wherein: the retainer (2) is of an annular structure, pockets are uniformly arranged on the retainer (2), and gaps are kept between the retainer (2) and the outer circles of the rectangular groove B of the outer ring (1) and the rectangular groove A of the inner ring.

5. The four-point contact ball bearing for CT machine of claim 1, wherein: the balls (3) are arranged in the pockets of the retainer (2), the inner sides of the balls (3) are in contact with inner ring channels on the outer sides of the inner rings, and the outer sides of the balls (3) are in contact with outer ring (1) channels on the inner sides of the outer rings (1).