CN101413534A

CN101413534A - Radial ball bearing design and structure with axial overload protection

Info

Publication number: CN101413534A
Application number: CN200810230624.7A
Authority: CN
Inventors: 葛世东; 臧稳通; 靳国栋; 孙北奇
Original assignee: Luoyang Bearing Science and Technology Co Ltd
Current assignee: Luoyang Bearing Science and Technology Co Ltd
Priority date: 2008-10-21
Filing date: 2008-10-21
Publication date: 2009-04-22

Abstract

The invention discloses a radial ball bearing design with axial overload protection and a structure thereof. In the design, design width of a bearing outer ring 1 is widen, a ring of rigid semi-enclosed retaining shoulder 1.1 with a central hole is arranged on one end of the width, and the gross section of the retaining shoulder takes a symmetrical L-shaped structure; a raceway is arranged on an inner ring of an outer ring, is provided with a plurality of rolling elements 4, and is limited by a retainer 3 and supported by an inner ring 2; the inner bore size of the inner ring is smaller than the central hole size of the retaining shoulder; an inner end face of the retaining shoulder and an inner end face of the inner ring form a maximum permissible axial clearance, the clearance can be obtained by precisely measuring the axial clearance of the bearing and the inner ring displacement of the bearing under the action of permissible axial load, and the thickness of the retaining shoulder can be adjusted by the axial impact load borne by the bearing; when the axial displacement of the inner ring exceeds the permissible axial clearance, the contact of the inner end face of the retaining shoulder arranged on the outer ring with the inner ring end face prevents the inner ring end face from the axial displacement, and bears partial axial impact force, thus protecting the surfaces of the rolling elements and the raceway from compression damage.

Description

Tape spool is to the radial ball bearing design and the structure of overload protection

Technical field

The invention belongs to technical field of bearings, especially a kind of tape spool is to the radial ball bearing design and the structure of overload protection.

Background technique

Radial ball bearing is to use a class rolling bearing the most widely, and it uses installation all very simple, and high speed performance is good, low price, thereby obtained using widely.But radial ball bearing also has a fatal weakness, is exactly that axial carrying capacity is not high.Since its radially bearing capacity be far longer than its axial carrying capacity, so, generally use angular contact ball bearing, and the radially bearing capacity of angular contact ball bearing is less than the radially carrying of radial bearing in the bigger occasion of thrust load.Under some Environmental Conditions, what bearing mainly bore in operation process is very big passive radial load, does not generally bear or bear very little static thrust load, can only adopt radial ball bearing.But state of rest in the bearing using process, bearing might be born very big axial impact vibration, for example the steer motor bearing under the environment such as cannon and rocket launching.At this moment bearing probably makes the point of contact generation permanent plastic deformation of raceway and rolling element under the axial impact vibration, bearing after being impacted like this, because raceway is out of shape, and running accuracy is destroyed, performance can't satisfy usage requirement when needing to turn round subsequently.

Summary of the invention

In order to address the above problem; the invention provides radial ball bearing design and the structure of a kind of tape spool to overload protection; by changing the structure of bearing outer ring; make bearing outer ring and inner ring end face form a very little gap; be equivalent to add an axially stop block for inner ring; make bearing do the time spent at big axial impact; pass through axially stop block; balance out most of impulsive load; prevent that rolling element and raceway from permanent plastic deformation can not occur; after assurance withstands shocks, being kept of the normal operation performance of radial bearing, thus effectively solved the problem that radial ball bearing bears axial impact loading.

For achieving the above object, the present invention adopts following technological scheme:

Described tape spool is the design width that has increased bearing outer ring to the radial ball bearing design of overload protection, end at this width is provided with the rigidity shoulder block that a circle is semi-enclosed, have center hole, shoulder block and outer ring form one, and its total section slightly is symmetrical L type structure; The interior ring of outer ring is provided with raceway, disposes several rolling elements on the raceway, and each rolling element is spacing and supported by inner ring by retainer; The interior hole dimension of inner ring is less than the shoulder block central hole size; Shoulder block interior edge face and inner ring interior edge face form a little gap, closely spaced size is the bearing inner race maximum allowable axial clearance of permission, this gap can obtain by accurately measuring bearing axial clearance and the bearing inner ring displacement amount under Axial Loads allowable, also can regulate the thickness of shoulder block to adapt to the impact resistance of outer ring according to the axial impact loading size that bearing bore; When bearing inner race axial displacement surpasses axial clearance allowable; the interior edge face of its outer ring shoulder block contacts with the inner ring end face; will stop inner ring end face continuation generation axial displacement and bear its most of axially impulse force, weigh wounded thereby protect rolling element and raceway face can not produce.

Described tape spool is to the radial ball bearing structure of overload protection; be that a end at the outer ring width is provided with the rigidity shoulder block that a circle is semi-enclosed, have center hole; this shoulder block and outer ring form integrative-structure; its total section slightly is symmetrical L type structure; in the raceway of outer ring, dispose several rolling elements, retainer and inner ring; the interior edge face of inner ring and shoulder block interior edge face form a maximum allowable axial clearance h, and the interior hole dimension of inner ring is less than the shoulder block central hole size.

Because adopt aforesaid technological scheme, the present invention has following superiority:

1, outer ring and the inner ring of the present invention with L type structure has axial limiting unloading effect, bearing roller only bears thrust load seldom under axial impact, bearing is not damaged, it is good that the bearing performance index keeps, and solved the problem of damaging under the big axially impulsive load of bearing smoothly.

2, increase of bearing outer ring width and the shoulder block that forms and inner ring interior edge face form a very little maximum allowable axial clearance h, and the size of this gap h equals the axial clearance of bearing and the inner ring displacement sum under the bearing Axial Loads allowable.

3, the controlled quentity controlled variable of gap h can be achieved by two interior edge face of bedding-in.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Among Fig. 1: 1-bearing outer ring; 1.1-shoulder block; 2-bearing inner race; 3-retainer; 4-rolling element.

Embodiment

Tape spool of the present invention is the design width that has increased bearing outer ring to the radial ball bearing design of overload protection, end at this width is provided with the rigidity shoulder block that a circle is semi-enclosed, have center hole, shoulder block and outer ring form one, and its total section slightly is symmetrical L type structure; The interior ring of outer ring is provided with raceway, disposes several rolling elements on the raceway, and each rolling element is spacing and supported by inner ring by retainer; The interior hole dimension of inner ring is less than the shoulder block central hole size; Shoulder block interior edge face and inner ring interior edge face form a little gap, closely spaced size is the bearing inner race maximum allowable axial clearance h of permission, this gap h can obtain by accurately measuring bearing axial clearance and the bearing inner ring displacement amount under Axial Loads allowable, also can regulate the thickness of shoulder block to adapt to the impact resistance of outer ring according to the axial impact loading size that bearing bore; When bearing inner race axial displacement surpasses axial clearance h allowable; the interior edge face of its outer ring shoulder block contacts with the inner ring end face; will stop inner ring end face continuation generation axial displacement and bear its most of axially impulse force, weigh wounded thereby protect rolling element and raceway face can not produce.

In conjunction with Fig. 1; tape spool of the present invention is to the radial ball bearing structure of overload protection; an end that is 1 width in the outer ring is provided with the rigidity shoulder block 1.1 that a circle is semi-enclosed, have center hole; this shoulder block 1.1 and outer ring 1 form integrative-structure; its total section slightly is symmetrical L type structure; in the raceway of outer ring 1, dispose several rolling elements 4, retainer 3 and inner ring 2; the interior edge face of inner ring 2 and shoulder block 1.1 interior edge faces form a maximum allowable axial clearance h, and the interior hole dimension of inner ring 2 is less than shoulder block 1.1 central hole size.

The present invention mainly is by changing the structural type of bearing outer ring, make shoulder block 1.1 interior edge faces and inner ring 2 interior edge faces on the bearing outer ring form a very little maximum allowable axial clearance h, be equivalent to add an axial limiting structure for inner ring 2, make bearing do the time spent at bigger axial impact, axial limiting by shoulder block 1.1, balance out most of impulsive load, prevent that permanent plastic deformation from appearring in rolling element 4 and raceway, the assurance normal operation performance of back radial bearing that withstands shocks is born big axially impulsive load and is caused the problem of damage of bearings in state of rest thereby effectively solve radial ball bearing.

Claims

1, a kind of tape spool is to the radial ball bearing design of overload protection, it is characterized in that: be the design width that has increased bearing outer ring, end at this width is provided with the rigidity shoulder block that a circle is semi-enclosed, have center hole, and shoulder block and outer ring form one, and its total section slightly is symmetrical L type structure; The interior ring of outer ring is provided with raceway, disposes several rolling elements on the raceway, and each rolling element is spacing and supported by inner ring by retainer; The interior hole dimension of inner ring is less than the shoulder block central hole size; Shoulder block interior edge face and inner ring interior edge face form a little gap, closely spaced size is the bearing inner race maximum allowable axial clearance h of permission, this gap h can obtain by accurately measuring bearing axial clearance and the bearing inner ring displacement amount under Axial Loads allowable, also can regulate the thickness of shoulder block to adapt to the impact resistance of outer ring according to the axial impact loading size that bearing bore; When bearing inner race axial displacement surpasses axial clearance h allowable; the interior edge face of its outer ring shoulder block contacts with the inner ring end face; will stop inner ring end face continuation generation axial displacement and bear its most of axially impulse force, weigh wounded thereby protect rolling element and raceway face can not produce.

2; a kind of tape spool is to the radial ball bearing structure of overload protection; it is characterized in that: it is semi-enclosed to be that the end of (1) width in the outer ring is provided with a circle; the rigidity shoulder block (1.1) that has center hole; this shoulder block (1.1) and outer ring (1) form integrative-structure; its total section slightly is symmetrical L type structure; in the raceway of outer ring (1), dispose several rolling elements (4); retainer (3) and inner ring (2); the interior edge face of inner ring (2) and shoulder block (1.1) interior edge face form a maximum allowable axial clearance h, and the interior hole dimension of inner ring (2) is less than shoulder block (1.1) central hole size.