CN103195804A

CN103195804A - Planetary rolling bearing

Info

Publication number: CN103195804A
Application number: CN2012100078914A
Authority: CN
Inventors: 曹毅文
Original assignee: CHANGZHOU DONGFENG BEARING Co Ltd
Current assignee: CHANGZHOU DONGFENG BEARING Co Ltd
Priority date: 2012-01-09
Filing date: 2012-01-09
Publication date: 2013-07-10

Abstract

A planetary rolling bearing. A bearing main body comprises an inner ring, an outer ring, a ball track, main rollers and auxiliary rollers. The inner ring and the outer ring are sleeved together in a way of coincided central axes; the outer side of the inner ring and the inner side of the outer ring form the ball track; rollers in the ball track comprise a main roller group and an auxiliary roller group; the rollers are arranged in a planetary shape, namely axes of every three rollers form an isosceles triangle in the ball track; and each roller body is tangent to another along an axis direction, as well as tangent to the ball track wall. When the bearing works, only rolling friction exists between the main rollers and the auxiliary rollers, and between the main rollers, the auxiliary rollers and the outer ring and the inner ring; and original sliding friction and collision friction between the rollers and a holder do not exist. Compared with the prior art, the invention has beneficial effect that the holder is cancelled to reduce collision friction between the holder and the rollers, effectively reduce high temperature of the bearing and oil loss time, thereby prolonging the service life of the bearing.

Description

The planet rolling bearing

Technical field

The present invention is a kind of bearing, particularly a kind of planet rolling bearing that comes automatic spacing by the auxilliary roller mode of planetary layout.

Background technique

Rolling bearing has band and not with two kinds of structures of retainer.The general requirement of large size bearing born bigger load, often is not with retainer, and fills rolling element between inside and outside raceway, and this allows the contact that very easily produces each other between the rolling element rub, and the operating life that causes that has increased pivot friction high temperature greatly shortens.Most of middle-size and small-size rolling bearings all have retainer, the main effect one of retainer is that retainer is equally spaced with rolling element, be distributed on the circumference of raceway when preventing work and directly run foul of each other and rub between rolling element, in order to will rub and heating remains on floor level; The 2nd, guiding and drive rolling element normally roll at raceway, provide uniform load to distribute and operation quiet, constant speed; The 3rd, at zero load district's guiding rolling element, improve the rolling condition in the bearing, prevent from having destructive slip; The 4th, in the divergence type bearing, rolling element and a lasso are combined, come off to prevent rolling element.Therefore retainer is very important in rolling bearing, but retainer can be subjected to mechanical stress because of friction, strain and inertial force, and they also may be subjected to the chemical action of some oiling agent, lubricant additive or its aging product, organic solvent or freezing mixture and the impaired bearing that causes finishes its working life.

Rolling bearing is in real work because high quick-action changes, between all roll pieces and rolling element all produced sliding friction with retainer, outer ring, thereby it is oily to cause that high temperature loses, and causes the bearing bundle extremely to damage.

Summary of the invention

At above-mentioned the deficiencies in the prior art, the objective of the invention is to save retainer, utilize the planet arrangement self-align in raceway by roll piece, the motion friction of minimizing, thereby allow bearing main body remain under minimum friction and the heating level, realize prolonging the operating life target of bearing.

Middle (center) bearing main body of the present invention includes inner ring, outer ring, raceway, main roller, auxilliary roller.Technological scheme of the present invention is that inner ring and outer ring are nested together with the medial axis coincidence system, raceway is formed with the inboard of outer ring in the inner ring outside, rolling element in the raceway is that main and auxiliary two groups roller is formed and become planetary and is abound with, the mode that is an isosceles triangle of axle center formation of per three rollers is abound with in raceway, and the shaft of each roller is also tangent with the raceway wall respectively along the mutual tangent while of axial direction simultaneously.

When bearing working, all have only rolling friction between the major-minor roller and with outer ring, inner ring, there are not the sliding friction and the collision friction that exist between original rolling element and the retainer.

Major-minor roller in the raceway is with planetary tangent layout, and making has more space between the rolling element, more is conducive to absorption and stores more lubricating oil, is conducive to the lubricated of bearing.

The beneficial effect that the present invention compared with prior art has is the cancellation retainer, reduces rolling element and its collision friction, effectively reduces bearing high temperature and mistake oil time, thereby prolongs the working life of bearing.

Description of drawings

Fig. 1 is plan view of the present invention (B-B cut-away view), comprising outer ring 1, inner ring 2, raceway 3, main roller 4, auxilliary roller 5.

Fig. 2 is cut-away view of the present invention (A-A cut-away view), comprising outer ring 1, inner ring 2, raceway 3, main roller 4, auxilliary roller 5.

Embodiment

The present invention is further described below in conjunction with drawings and Examples.

As shown in Figure 1, bearing main body comprises outer ring 1, inner ring 2, raceway 3, main roller 4, auxilliary roller 5; Outer ring 1 is formed the bearing main body support with inner ring 2 with medial axis coincidence system fit; The longitudinal section of outer ring 1 is U-shaped, constitutes top up and down and the outer wall of raceway 3 by it, and the outside of inner ring 2 constitutes the inwall of raceway 3; The mode that forms an isosceles triangle with the axle center of each bar master roller 4 and two auxilliary rollers 5 is abound with raceway 3, shaft one side of main roller 4 and the outside of inner ring 2 are that the inwall of raceway 3 is tangent, the shaft of opposite side and two auxilliary rollers 5 is tangent, the shaft of two auxilliary rollers 5 is tangent with the outer wall of raceway 3 again, and main roller 4 is not tangent and possess certain distance with the outer wall of raceway 3.Main roller 4 and auxilliary roller 5 highly equate to share raceway 3, and the post two ends are spherical shape or coniform simultaneously, are to contact to guarantee roller two ends and the true mode of apical grafting up and down of raceway 3, reduce the friction of two ends generation.

The shaft of main roller 4 and auxilliary roller 5 and the inside and outside wall of raceway 3 are not simultaneously all tangent, only are tangential on respectively on inwall or the outer wall, so the shaft of main roller 4 and auxilliary roller 5 all is to have only three axial tangent lines mutually in total simultaneously.

The shaft diameter of main roller 4 and auxilliary roller 5 can transform mutually, and namely main roller 4 shaft diameters can be greater than the shaft diameter of auxilliary roller 5, also can be less than the shaft diameter of auxilliary roller 5.

When bearing working, when inner ring 2 rotates along with the mechanical rotating shaft of tight cover, do rotation on one side around the medial axis revolution of inner ring O2 around the medial axis of self on one side synchronously with the tangent main roller 4 of inner ring 2, do around self medial axis on one side with the tangent auxilliary roller 5 of main roller 4 and the equidirectional rotation of inner ring O2 on one side around the medial axis revolution of inner ring O2, like this, all has only rolling friction between all rolling element in the whole planet rolling bearing, do not have between the original rolling element or the sliding friction that exists between rolling element and the retainer and collision friction, thereby realization reduce the target that the friction of bearing inside does not allow the bearing temperature superelevation increase the service life.

Claims

1. planet rolling bearing, its bearing main body includes inner ring, outer ring, raceway, main roller, auxilliary roller, inner ring and outer ring are nested together with the medial axis coincidence system, raceway is formed with the inboard of outer ring in the inner ring outside, it is characterized in that rolling element in the raceway is that main and auxiliary two groups roller is formed and become planetary and is abound with, the mode that is an isosceles triangle of axle center formation of per three rollers is abound with in raceway, and the shaft of each roller is also tangent with the raceway wall respectively along the mutual tangent while of axial direction simultaneously.

2. planet rolling bearing as claimed in claim 1 is characterized in that main roller and auxilliary roller share a raceway.

3. planet rolling bearing as claimed in claim 1 is characterized in that the shaft diameter of main roller and auxilliary roller can transform mutually.

4. planet rolling bearing as claimed in claim 1 is characterized in that the shaft of main roller and auxilliary roller all is to have only three axial tangent lines mutually simultaneously in total.