Small Diameter Rolling Bearing Vibration Absorption
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Solution Overview
Problem
Fishing reels with small diameter rolling bearings face challenges in forming grooves for elastic elements, leading to inefficient vibration absorption and unstable press-fitting pressure, which compromises load bearing capacity and increases frictional resistance.
Innovation Solution
A fishing reel design with a rolling bearing having an outer diameter of 8 mm or less, featuring an outer ring with a holding groove on its outer peripheral surface and a minimum thickness of 10% or more of the outer diameter, allowing for effective vibration absorption while maintaining load bearing capacity and reducing frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the outer diameter of the rolling bearing is reduced to minimize frictional resistance, then the frictional resistance decreases, but the load bearing capacity deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges: outer diameter of 8 mm or less (to minimize friction), minimum outer ring thickness of 10% or more of the outer diameter (to maintain strength), and rolling element diameter of 3 mm or less. These parameter changes allow the bearing to operate with low friction while maintaining adequate load bearing capacity through optimized dimensional relationships.
2Loss of energy
If the outer ring thickness is reduced to accommodate small diameter bearing, then the frictional resistance decreases, but the ability to form holding groove deteriorates
Solution Approach 1:
The patent establishes a minimum outer ring thickness parameter of 10% or more of the outer diameter, which ensures sufficient material thickness to form the holding groove for the elastic element while maintaining the small overall bearing diameter (8 mm or less) required for low friction operation.
3Length of moving object
If the rolling element diameter is reduced to fit small diameter bearing, then the outer diameter can be reduced, but the load bearing capacity deteriorates
Solution Approach 1:
The patent specifies a rolling element diameter of 3 mm or less to enable small overall bearing dimensions, while compensating for the reduced load bearing capacity through optimized outer ring thickness (10% or more of outer diameter) and appropriate selection of bearing configuration to maintain adequate load support capability.
4Reliability
If the groove for holding elastic element is formed in the inner peripheral surface of mounting hole, then the elastic element can be held, but the inner diameter control becomes difficult and vibration absorption is inefficient
Solution Approach 1:
Instead of forming the holding groove in the mounting hole (inner peripheral surface), the patent inverts the approach by forming the holding groove directly on the outer peripheral surface of the outer ring of the bearing itself. This inversion simplifies manufacturing by eliminating the need for precise inner diameter control of the mounting hole while effectively retaining the elastic element for vibration absorption.
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 effectively reduces vibration and maintains load bearing capacity, while minimizing frictional resistance, by securing the thickness of the outer ring to form the holding groove and using an elastic element to absorb rotational vibrations.
Implementation Method 1
the elastic element is able to absorb the vibration caused by the rotation of the rotating shaft
Implementation Method 2
an annular elastic element is disposed between the outer peripheral surface of the rolling bearing and the inner peripheral surface of a mounting hole
Data Source
AI summary
A dual-bearing reel includes a reel body, a spool shaft, a rolling bearing, and an elastic element. The spool shaft is rotatable with respect to the reel body. The rolling bearing has an outer diameter of 8 mm or less and supports the spool shaft. The rolling bearing includes an outer ring having a holding groove in an outer peripheral surface thereof, an inner ring connected to the spool shaft so as to be integrally rotatable, and a rolling element disposed between the outer ring and the inner ring. The elastic element has an annular shape and is held in the holding groove. The holding groove is located in a position that does not overlap with the rolling element in a radial direction of the spool shaft. The outer ring has a minimum thickness that is 10% or more of the outer diameter of the rolling bearing.