CN2046161U

CN2046161U - Dual point contact between ball and rolling track type rolling bearing

Info

Publication number: CN2046161U
Application number: CN 88220376
Authority: CN
Inventors: 赵硕颀
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-11-24
Filing date: 1988-11-24
Publication date: 1989-10-18

Abstract

In a ball bearing composed of a ball, an inner ring and an outer ring, the curve of the radial section of a rolling track is composed of two incontinuous curves, two contact points are formed between the rolling track and the ball, and thus the contact stress of the contact points is reduced for extending the service life of the ball bearing and enhancing the bearing capacity of the ball bearing.

Description

Dual point contact between ball and rolling track type rolling bearing

The utility model belongs to the mechanical basic part ball bearing.

In general ball bearing, the radial cross section curve of Internal and external cycle raceway is the garden arc that a radius is a bit larger tham radius of sphericity, and for any contacts, when bearing bore load, spheroid and raceway were at point of contact place generation contact stress between spheroid and the raceway.The bearing capacity of bearing with and working life, all the size with contact stress has substantial connection.If can on bearing structure, improve, make and bearing under the equally loaded situation, reduce the contact stress between spheroid and the raceway, the performance of ball bearing will improve a lot so.

The purpose of this utility model is to design a kind of radial cross section curve of new ball bearing Internal and external cycle raceway, makes the point of contact between raceway and the spheroid make 2 points into by a bit, thereby reduces the contact stress between spheroid and the raceway, improves the performance of ball bearing.

The purpose of this utility model is to realize like this.The rolling track and radial cross section curve of ball bearing Internal and external cycle was formed by changing into by two sections not consecutive curves by one section garden arc originally, spheroid and raceway have two point of contact, and generally these two sections curves are to be symmetrical in two sections not consecutive garden arcs that its radius of the centre of sphere is a bit larger tham radius of sphericity.Its principle is seen accompanying drawing: figure one is the hookup of spheroid and raceway in the at present common ball bearing.The rolling track and radial cross section curve is the radius garden arc big slightly than radius of sphericity, have only between spheroid and the raceway point of contact 0 ', load P is all by point of contact 0 ' transmission, spheroid and raceway 0 ' on the contact stress function relation that is directly proportional with load P.Figure two is the hookup of groove-section curve and spheroid and raceway in the ball bearing of the present utility model.The groove-section curve by two sections not consecutive curve formed, generally these two sections curves are to be symmetrical in two sections not consecutive garden arcs that the centre of sphere, its radius are a bit larger tham spheroid.From scheming as seen, the point of contact of spheroid and raceway was from being 0 ' a bit to make A, B 2 points into originally.Under the situation of bearing load P equally, as can be known from simple mechanics equilibrium of forces:

P＝P ₁cosθ ₁＋P ₂cosθ ₂

Work as θ ₁=θ ₂The time, P ₁=P ₂

P＝（P ₁＋P ₂）cosθ ₁＝2P ₁cosθ ₁

When θ=5 °, cos θ=0.996

During θ=10 °, cos θ=0.984

Meaning promptly when θ hour, the value of cos θ approaches 1, at this moment

P ≈ 2P ₁Or P ₁=P ₂≈ P/2

More than analyze explanation, in 2 rollings that contact of spheroid and raceway are paid, when two point of contact and ball centre angle hour, it was when a bit contacting half originally that load on two point of contact roughly only is equivalent to, therefore contact stress is corresponding reduces, the life-span that rolling is paid can increase, if it is constant to keep the level of contact stress, the bearing capacity of paying of then rolling just almost can significantly improve.

Advantage of the present utility model is that material, part number and the size of ball bearing is all constant, manufacturing process, man-hour and precision are also all constant, and the bearing capacity of bearing and working life can obviously improve, and its social economic benefit are conspicuous.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Figure three is depicted as the sectional view of the utility model ball bearing.Internal and external cycle rolling track and radial cross section curve system is symmetrical in the garden arc that the centre of sphere, radius be a bit larger tham radius of sphericity by two sections and is formed.For the ease of processing, clearance groov can be left in the centre.The point of contact of inside and outside raceway and spheroid respectively is AB and A ' B ' 2 points.When bearing load P, the load of being born on each point of contact is equivalent to about P/2 substantially, so contact stress reduces naturally.From the angle of processing and assembling, bearing enclose all is at 2 with spheroid and contacts, and when 4 contacts promptly will be arranged simultaneously, permissible accuracy improved possibly, makes relatively more difficultly, so also can be separately makes the raceway curve of inner ring or outer ring into two sections garden arcs.Because in general ball bearing, the contact stress of inner ring raceway is high than the contact stress of outer ring raceway, recited abovely form if separately inner ring raceway radial cross section curve is changed into by two sections garden arcs, the contact stress of inner ring raceway just can reduce so, and the bearing capacity of whole bearing just can improve.Simultaneously,, can also increase the stability of operation, reduce to shake when spheroid and Internal and external cycle form at 3 when contact.This is confirmed by the sample of trial-production.

According to same principle, obvious structure of the present utility model can also be applied to other machineries that adopt spheroids and rollings of raceway composition to pay and get on, for example steel ball piston type hydraulic pumps and oil hydraulic motor.

Claims

1, the ball bearing formed of a kind of spheroid and Internal and external cycle is characterized in that: the groove-section curve of Internal and external cycle by two sections not consecutive curve formed, two point of contact are arranged between spheroid and the raceway.

2,, it is characterized in that by the said ball bearing of claim 1: the groove-section curve of inner ring by two sections not consecutive curve formed, two point of contact are arranged between spheroid and the inner ring raceway.

3,, it is characterized in that by the said ball bearing of claim 1: the groove-section curve of outer ring by two sections not consecutive curve formed, two point of contact are arranged between spheroid and the outer ring raceway.

4,, it is characterized in that by the said ball bearing of claim 1: the groove-section curve be two sections be symmetrical in the centre of sphere, its radius is a bit larger tham the not consecutive circular arc of radius of sphericity.

5, by the said ball bearing of claim 1, it is characterized in that: leave clearance groov between two sections not consecutive curves of groove-section curve.