CN2385071Y

CN2385071Y - New type roller bit rolling bearing

Info

Publication number: CN2385071Y
Application number: CN 99230771
Authority: CN
Inventors: 张茂
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 1999-01-14
Filing date: 1999-01-14
Publication date: 2000-06-28
Anticipated expiration: 2009-01-14

Abstract

The utility model relates to a roller bit rolling bearing, which is such a roller bit for drilling in the earth crust, and the roller bit rolling bearing belongs to a drilling tool. The utility model is composed of an outer ring which is formed by the inner hole of the roller, an inner ring which is formed by a tooth claw shaft neck, a hollow rolling body, a locking steel ball, a thrust bearing, and a sealing ring. The utility model is characterized in that an inner hole is made along the axis of the along rolling body, the hollow rolling body is formed, and the bus bar of the inner hole hollow rolling body can be a straight line, or the composition of a straight line and a circular arc, or a hyperbolic line. After the rolling body is provided with the hole, and the maximum load of the rolling body can be reduced. The peak value of the contact stress at both ends of the rolling body is reduced, and the flexibility of the roller bit rolling bearing is increased. The dynamic load of the whole bit is effectively reduced, and the service life of the bit is lengthened.

Description

A kind of novel rock bit rolling bearing

The utility model relates to the rock bit rolling bearing that is used for drilling well on the earth's crust, belongs to the drilling well utensil.

Modern gear wheel roller bearing bit is made up of tooth pawl and gear wheel usually, has the inner ring that runway forms rolling bearing on the big axle journal of tooth pawl; Its gear wheel endoporus forms the outer ring of rolling bearing, between inner ring and outer ring rolling element is housed, thereby forms a rolling bearing.Do not have retainer in the rock bit rolling bearing, belong to and fill the roller-type rolling bearing.The work under bad environment of rock bit rolling bearing, lubricating grease can not be changed, radiating condition is poor, environment temperature height, the load of bearing be for impacting heavy duty, therefore make the life-span of rock bit rolling bearing very low.Owing to each rolling element unbalance stress, each rolling element end contact stress are unusual distribution, cause contact fatigue failure simultaneously, make its inefficacy, application life is short.

The purpose of this utility model is, a kind of hollow rolling element that utilizes is provided, and increases the bit bearing flexibility, improves the novel rock bit rolling bearing of drilling life of bit.

In order to achieve the above object, the utility model is by the following technical solutions: the outer ring 1 that a kind of novel rock bit rolling bearing is mainly formed by the gear wheel endoporus, the inner ring 2 that gear claw journal forms, hollow rolling element 3, locking steel ball 4, thrust bearing 5, sealing ring 6 are formed, it is characterized in that:, form hollow rolling element along having an endoporus on the axis direction of rolling element 3.So that evenly each rolling element is stressed, reduce the end stress peak value, increase the bit bearing flexibility.Hollow rolling element 3 endoporus buses can be straight line or Straight Line and Arc combination or hyperbola.

Major advantage of the present utility model is: (1) has reduced the rigidity of rolling element after the rolling element central punch, the load of maximum carrying rolling element is reduced, thereby reduce contact stress, the life-span of improving rolling bearing; (2) after curved slot is beaten at the rolling element center, rolling element rigidity is changed along axis, rigidity is reduced, end load is descended, thereby reach the purpose that reduces the end stress peak value; (3) the utility model is compared with the scheme of roller profile correction, has handling ease, advantage of low manufacturing cost.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the structural representation of the utility model rock bit rolling bearing.

Fig. 2 opens the schematic diagram in linear hole for hollow rolling element 3 centers.

Fig. 3 opens the schematic diagram in hyperbola hole for hollow rolling element 3 centers.

This rock bit rolling bearing, mainly the outer ring 1 that forms by the gear wheel endoporus, inner ring 2, hollow rolling element 3 that gear claw journal forms, lock steel ball 4, thrust bearing 5, sealing ring 6 and formed.A plurality of hollow rolling elements 3 are housed between outer ring 1 and inner ring 2, thereby form the warp-wise rolling bearing; The end face of outer ring 1 and inner ring 2 forms the thrust bearing pair; The effect of sealing ring 6 is to prevent that introduced contaminants from entering in the bearing; Locking steel ball 4 is put into after bearing assembles, and its objective is to prevent that gear wheel from coming off from the tooth pawl.

Claims

A kind of novel rock bit rolling bearing, mainly the outer ring (1) that is formed by the gear wheel endoporus, the inner ring (2) that gear claw journal forms, hollow rolling element (3), locking steel ball (4), thrust bearing (5), sealing ring (6) are formed, its characteristics are along having an endoporus on the axis direction of rolling element (3), form hollow rolling element, the bus of its endoporus can be straight line or Straight Line and Arc combination or hyperbola.