CN2573751Y

CN2573751Y - Three-point contacting ball bearing

Info

Publication number: CN2573751Y
Application number: CN 01250920
Authority: CN
Inventors: 姜三勇; 王志刚; 张守涛; 董晓飞
Original assignee: Heilongjiang Province Hit Science And Technology Cooperation Of China Russia Co ltd
Current assignee: Heilongjiang Province Hit Science And Technology Cooperation Of China Russia Co ltd
Priority date: 2001-09-30
Filing date: 2001-09-30
Publication date: 2003-09-17
Anticipated expiration: 2011-09-30

Abstract

The utility model discloses a three-point contacting ball bearing which relates to a rolling bearing. The utility model comprises a rotary ring, a fixed ring and ball bearings which are arranged between rolling tracks of the rotary ring and the fixed ring, wherein the spherical ball bearings are in contact with the center point of the cambered rolling track of the rotary ring and respectively form point contact with two convex ribs of the rolling track of the fixed ring; the two convex ribs on the fixed ring, the normal from the contact points of the ball beings to the centers of the ball bearings and the radial plane of the bearing form a pressure line angle beta with the same angle, and the angle of the pressure line angle beta is greater than or equal to 45 DEG and is smaller than or equal to 79 DEG. At least one through hole (4) is formed between the two convex ribs of the fixed ring (2), and the through hole (4) is used for supplying lubricating oil to a bearing cavity and discharging excess lubricating oil. The utility model overcomes the problem that the centrifugal force of a rolling body is too large when the rotating speed of the existing rolling bearing is too high. The utility model has the advantages of long service life and high reliable performance.

Description

Three-point contact ball bearing

Technical field: the utility model relates to a kind of rolling bearing.

Background technique: when existing rolling bearing rotated at high rotating speed, high centrifugal force acted on the rolling element.Work as d ₀N＞1.5 * 10 ⁶Mm rev/min (in the formula: d ₀Be the diameter of axle, n is a rotating speed) time, then centrifugal force formed stress on outer-race ball track can surpass the lip-deep maximum unit pressure of interior loop contacts.The centrifugal force of rolling element is relevant with the rotating speed of retainer, when interior ring rotates: n _Protect=(1-d/D ₀) n _In/ 2; When outer shroud rotates: n _Protect=(1+d/D ₀) n _Outward/ 2 (in the formula: d is the rolling element diameter, D ₀Be the circle diameter that move in the rolling element center of circle, n _{Inside and outside}Be the rotating speed of interior ring or outer shroud, n _ProtectRotating speed for retaining ring).Therefore when ultra high speed turned round, centrifugal force can surpass the bearing capacity of bearing, made the lost of life of bearing, and reliability reduces.

Summary of the invention: the utility model designs a kind of three-point contact ball bearing, and this bearing has overcome existing rolling bearing when rotating speed is too high, the problem that the centrifugal force of rolling element is excessive.Life-span, the reliability of this bearing are improved.The utility model comprises swivel becket, retaining ring, and be arranged on ball between the raceway of swivel becket and retaining ring, spherical ball contacts with the central point of the arcuate groove of swivel becket, ball and two fins on the retaining ring raceway form respectively and contact, two fins on the retaining ring and the point of contact of ball all form the pressure line angle β of same angle with the radial plane of bearing to the normal at ball center, the angle of pressure line angle β is: 45 °≤β≤79 °, be provided with one on the retaining ring between two fins at least in order to the through hole 4 to bearing bore supplying lubricating oil and the unnecessary lubricant oil of discharge.After adopting said structure, the rotating speed of retainer is: n _Protect=(1 ± d/D ₀) (cos β) n/2.When β=45 °, the rotational speed of retainer reduces to 80% of former speed; When β=79 °, the rotational speed of retainer reduces to 30% of former speed; The centrifugal force that can bear when bearing is fixedly the time, adopt said structure after, the rotating speed of retainer is reduced to 30%-80%, the limit speed of corresponding bearing has improved 1.2～3 times.High life, the unfailing performance of this bearing are strong.Structure of the present utility model is applicable to radial bearing, radial-thrust bearing and thrust-bearing.It can be widely used in the various mechanisms as the ultra high speed bearing, as centrifuge, gyroscope, motor, steam turbine, machine tool chief axis etc.

Description of drawings: Fig. 1 is the structural representation of embodiment one, and Fig. 2 is the structural representation of embodiment two, and Fig. 3 is the structural representation of embodiment three.

Embodiment one: the bearing of (consulting Fig. 1) present embodiment is a radial ball bearing.Ring 1, outer shroud 2 and ball 3 in it comprises, retaining ring is the outer shroud 2 of radial ball bearing, swivel becket is that spherical ball 3 is the central point A of the inner race 5 of arc with the cross section between the outer-race ball track 6 of ring 1 inner race 5 and outer shroud 2 in interior ring 1, the ball 3 of radial ball bearing is arranged on ₁Contact, the left side fin 9 on ball 3 and the outer-race ball track 6 forms point with right side fin 10 and contacts.The point of contact B of left side fin 9 and right side fin 10 and ball 3 ₁And C ₁All form the pressure line angle β of same angle with the radial plane of bearing to the normal at ball 3 centers, the angle of pressure line angle β is: 45 °≤β≤79 °.At least be provided with one on the outer shroud 2 between two fins in order to through hole 4 to bearing bore supplying lubricating oil and the unnecessary lubricant oil of discharge.

Embodiment two: what (consulting Fig. 2) present embodiment and embodiment one were different is that swivel becket is the outer shroud 2 of radial ball bearing, and retaining ring is the interior ring 1 of radial ball bearing, and the cross section of outer-race ball track 6 is an arc, the central point A of ball 3 and outer-race ball track 6 ₂Contact, left side fin 9, right side fin 10 and through hole 4 are arranged on inner race 5, left side fin 9 forms point with right side fin 10 and ball 3 and contacts, and other structural relation and technical parameter are identical with embodiment one.

Embodiment three: the bearing of (consulting Fig. 3) present embodiment is a thrust ball bearing.It comprises left side ring 11, right ring 12 and ball 3, retaining ring is the left side ring 11 of thrust ball bearing, swivel becket is the right side ring 12 of thrust ball bearing, and ball 3 is arranged on the left side of left side ring 11 and encircles between the right side ring raceway 7 of raceway 8 and right ring 12, the central point A of the right side ring raceway 7 that spherical ball 3 and cross section are arc ₃Contact, ball 3 contacts with outside fin 14 formation points with the inboard fin 13 that a left side is encircled on the raceway 8.The point of contact B of inboard fin 13 and outside fin 14 and ball 3 ₃And C ₃All form the pressure line angle β of identical degree angle with the radial plane of bearing to the normal at ball 3 centers, the angle of pressure line angle β is 45 °≤β≤79 °, is provided with one at least in order to the bearing bore supplying lubricating oil with discharge the through hole 4 of unnecessary lubricant oil between two fins of left side ring 11.

Claims

1, three-point contact ball bearing, it comprise swivel becket, retaining ring and be arranged on swivel becket and the raceway of retaining ring between ball, it is characterized in that spherical ball contacts with the central point of the arcuate groove of swivel becket, ball and two fins on the retaining ring raceway form respectively and contact, and two fins on the retaining ring and the point of contact of ball all form the pressure line angle β of same angle with the radial plane of bearing to the normal at ball center.

2, three-point contact ball bearing according to claim 1 is characterized in that the angle of pressure line angle β is: 45 °≤β≤79 °.

3, three-point contact ball bearing according to claim 1 is characterized in that being provided with one on the retaining ring between two fins at least in order to the through hole (4) to bearing bore supplying lubricating oil and the unnecessary lubricant oil of discharge.

4, according to claim 1,2,3 described three-point contact ball bearings, it is characterized in that swivel becket is the interior ring (1) of radial ball bearing, retaining ring is the outer shroud (2) of radial ball bearing.

5, according to claim 1,2,3 described three-point contact ball bearings, it is characterized in that swivel becket is the outer shroud (2) of radial ball bearing, retaining ring is the interior ring (1) of radial ball bearing.

6, according to claim 1,2,3 described three-point contact ball bearings, it is characterized in that retaining ring is the left side ring (11) of thrust ball bearing, swivel becket is the right side ring (12) of thrust ball bearing.