Multi-Row Bearing Raceway Geometry for Stable Axial Groove Measurement
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Solution Overview
Problem
Existing multi-row bearings face challenges in accurately and efficiently measuring the axial dimension between raceway grooves, leading to instability in machining precision and increased labor and cost due to frequent disassembly for measurement.
Innovation Solution
A multi-row bearing design with outer ring raceway grooves formed on both sides of the groove bottom, allowing for stable installation of a measuring tool that accurately measures the axial dimension between grooves, enabling high-precision machining without frequent disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer ring raceway groove is formed only from the groove bottom to the groove shoulder on one side, then the bearing structure is simpler, but the measuring tool cannot be stably installed and measurement becomes unstable
Solution Approach 1:
The patent applies asymmetry by forming the outer ring raceway groove only on one side of the groove bottom, creating an asymmetric structure where the groove is positioned asymmetrically relative to the groove bottom. This asymmetric configuration allows the measuring tool to be stably installed by engaging with the groove shoulders on both sides of the groove, thereby achieving stable measurement of the axial dimension between raceway grooves.
2Measurement precision
If measurement is performed by removing the workpiece from the processing machine, then measurement can be performed, but the processing method requires very cost and labor
Solution Approach 1:
The patent applies self-service by designing the raceway groove structure to enable the workpiece to serve its own measurement function. The groove is formed to allow measuring tools to be stably installed and perform measurements directly on the workpiece while it remains on the processing machine, eliminating the need for repeated removal and attachment operations.
Solution Approach 2:
The patent applies preliminary action by pre-forming the raceway groove with specific geometric characteristics that facilitate stable measurement. The groove is designed in advance to provide engagement surfaces for measuring tools, enabling measurements to be performed without removing the workpiece from the processing machine.
3Ease of operation
If the measuring tool is engaged with the raceway groove, then measurement can be performed, but the measurement value becomes unstable when the groove is formed only on one side
Solution Approach 1:
The patent applies asymmetry by forming the outer ring raceway groove only on one side of the groove bottom, creating an asymmetric structure where the groove is positioned asymmetrically relative to the groove bottom. This asymmetric configuration allows the measuring tool to be stably installed by engaging with the groove shoulders on both sides of the groove, thereby achieving stable measurement of the axial dimension between raceway grooves.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided are a multi-row bearing and a bearing unit including the multi-row bearing in which an axial dimension between raceway grooves can be accurately and easily measured at a short time, and the raceway grooves can be further machined with high dimensional accuracy. In a multi-row bearing (10), an inner ring raceway groove (31a) at one end portion in an axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an inner ring raceway groove (31b) at an intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom. In addition, an outer ring raceway groove (21a) at the other end portion in the axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an outer ring raceway groove (21b) at the intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom.