Tapered Roller Bearing Cage Pockets for Low-Force Assembly
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Solution Overview
Problem
The assembly of tapered roller bearings is challenging due to the need for tapered rollers to climb over a small flange portion, which requires excessive force and can lead to cage deformation or disintegration.
Innovation Solution
A tapered roller bearing design featuring a cage with pockets of varying angles, where the second pocket has a smaller angle than the first, allowing for increased radial displacement of tapered rollers, facilitating assembly while preventing the inner ring unit from coming apart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retaining portion size is increased to prevent the inner ring unit from coming apart, then reliability is improved, but the ease of assembly deteriorates
Solution Approach 1:
The cage is designed with two types of pockets: first pockets with a first angle having a first allowable displacement amount, and second pockets with a second angle having a second allowable displacement amount larger than the first. This local differentiation allows specific pockets to accommodate larger roller displacements during assembly while other pockets maintain stricter retention, resolving the contradiction between assembly ease and unit integrity.
Solution Approach 2:
The cage pockets are segmented into different types (first pockets and second pockets) with different geometric parameters. This segmentation allows the assembly process to utilize pockets with larger allowable displacement amounts, while other pockets maintain their retention function, thus enabling both easy assembly and reliable unit formation.
2Ease of manufacture
If excessive force is applied to allow tapered rollers to climb over the small flange portion, then assembly is achieved, but the cage may be whitened, plastically deformed, or cracked
Solution Approach 1:
The invention changes the geometric parameters of the cage pockets by providing different angles for first and second pockets. This parameter variation creates different allowable displacement amounts, allowing the assembly process to utilize pockets with larger displacement capacity, thereby reducing the excessive force needed and preventing cage damage during assembly.
3Ease of operation
If the retaining portion size is reduced to facilitate assembly, then ease of assembly is improved, but the tapered rollers may fall out of the pockets
Solution Approach 1:
Different pockets in the cage are designed with different retention characteristics through varying angles. First pockets have a first angle providing a first allowable displacement amount, while second pockets have a second angle providing a second allowable displacement amount. This local quality differentiation enables specific pockets to facilitate assembly with larger displacement while other pockets maintain strong retention.
Solution Approach 2:
The cage is segmented into multiple pocket types with different geometric properties. This segmentation allows the system to simultaneously achieve easy assembly (through pockets with larger allowable displacement) and reliable roller retention (through pockets with smaller allowable displacement), resolving the contradiction between these two requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design facilitates the assembly of tapered roller bearings by allowing tapered rollers to easily climb over the small flange portion with reduced force, while minimizing the risk of cage deformation and maintaining the integrity of the inner ring unit.
Implementation Method 1
the second pocket has a smaller angle than the first, allowing for increased radial displacement of tapered rollers
Data Source
AI summary
A tapered roller bearing includes: an inner ring; an outer ring; a plurality of tapered rollers in rolling contact with an inner and an outer ring raceway; and an annular cage that has a plurality of pockets for accommodating the tapered rollers. The cage has a plurality of first lateral faces respectively facing outer peripheral surfaces of the tapered rollers respectively accommodated in the plurality of pockets from a first side in a circumferential direction of the cage and a plurality of second lateral faces respectively facing the outer peripheral surfaces from a second side in the circumferential direction of the cage. The plurality of pockets includes a first pocket with a first angle as an angle formed by the first and second lateral faces, and a second pocket that has a second angle smaller than the first angle as the angle formed by the first and second lateral faces.