Double-Row Cylindrical Roller Bearing With Easier Raceway Assembly
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Solution Overview
Problem
Double-row angular cylindrical roller bearings require high precision in processing and assembly due to the 45° inclination of raceway surfaces, leading to increased manufacturing costs and difficulties in assembly, with issues such as excessive force on raceway surfaces, increased friction torque, and variation in bearing performance.
Innovation Solution
Combining a cross roller bearing with a parallel cylindrical roller bearing, where the cross roller bearing has V-shaped raceway grooves and the parallel bearing has rectangular raceway grooves, allowing for non-restricted relative positions of cylindrical rollers, reducing the need for precise alignment and processing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If double-row angular cylindrical roller bearing with 45° inclined raceway surfaces is used, then high rigidity and load capacity are achieved, but manufacturing precision requirements increase and assembly becomes difficult
Solution Approach 1:
The invention divides the double-row bearing into two independent single-row bearing units, each with its own cage and roller set. This segmentation allows each unit to be manufactured and assembled independently with standard tolerances, eliminating the need for high-precision alignment between raceway surfaces while maintaining the load capacity benefits of a double-row configuration.
2Ease of manufacture
If smaller diameter cylindrical rollers are used to reduce precision requirements, then assembly becomes easier, but rated load decreases
Solution Approach 1:
The invention introduces degree of freedom in the axial direction by allowing the inner ring to move relative to the outer ring within tolerance ranges. This dynamic capability enables the use of standard-tolerance raceways while maintaining proper roller contact and load transmission, eliminating the need to reduce roller diameter for assembly ease.
3Reliability
If high precision processing of inner and outer races is performed, then bearing performance consistency improves, but manufacturing cost increases
Solution Approach 1:
By segmenting the bearing into two independent units with separate cages, the invention allows each unit to be manufactured using standard tolerance specifications. This eliminates the need for expensive high-precision processing while ensuring consistent bearing performance through standardized manufacturing processes and proper clearance design.
Data Source
AI summary
A double-row cylindrical roller bearing employs a cross roller bearing for one cylindrical roller bearing and a parallel cylindrical roller bearing for the other cylindrical roller bearing. The relative positions of a first cylindrical roller on the cross roller bearing part side and a second cylindrical roller on the parallel cylindrical roller bearing part side are not restricted in the direction of the bearing center axis lines thereof. As a result, a bearing having high rigidity and being easy to process and assemble can be achieved at low cost. Increase in friction torque in bearing sliding sections and fluctuation in bearing properties can also be suppressed.