One-Way Clutch Outer Member Axial Force Reception

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Solution Overview

Problem

Conventional one-way clutch units for fishing reels face difficulties in stably applying a braking force to the outer member due to the lack of effective friction contact areas.

Innovation Solution

The one-way clutch unit incorporates a first external force receiving portion, such as a convex portion, on the outer member to receive axial forces, allowing for stable braking by distributing forces through multiple holders and convex portions, ensuring consistent braking action.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a friction plate contacts the end face of the outer member, then the one-way clutch unit can be constructed simply, but the braking force cannot be stably applied

Engineering Contradiction:

Improvestability of braking forceVSAvoidstructure of outer member

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The outer member is equipped with dedicated external force receiving portions (convex portions) at specific locations to receive axial forces from friction plates. This local structural enhancement provides stable braking force application without complicating the entire outer member structure, resolving the contradiction between braking stability and structural simplicity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The solution transitions from contacting the end face surface (2D surface contact) to using convex portions that extend in the axial dimension (3D structural feature). This dimensional change allows the friction plates to apply axial forces more effectively to the outer member, improving braking stability while maintaining structural efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the friction plate contacts the end surface of the outer member, then the contact area is large, but the braking force application is unstable

Engineering Contradiction:

Improveconsistency of braking actionVSAvoidgeometry of contact surface

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

Instead of having the friction plate contact the flat end surface of the outer member, the design inverts the approach by providing convex portions on the outer member that protrude toward the friction plate. This inversion creates dedicated force reception points that ensure stable and consistent braking action, addressing the reliability issue while optimizing the contact geometry.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If multiple holders and convex portions are provided on the outer member, then the braking force is stably applied, but the manufacturing complexity increases

Engineering Contradiction:

Improvestability of braking forceVSAvoidmanufacturing of outer member

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The holders and convex portions are integrated into a single outer member component rather than being separate parts. This merging of functions into one piece reduces assembly steps and manufacturing complexity while still providing the multiple force reception points necessary for stable braking force application.

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration enables a stable and consistent braking force application to the outer member, enhancing the operational reliability of the fishing reel by ensuring effective rotation control.

Implementation Method 1

The rolling element contacts the shaft member in the radial direction away from an axle of the shaft member

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

the friction plate contacts the end face of the outer member of the one-way clutch unit... it is difficult to apply a stable braking force to the outer member

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11779000B2One-way clutch unit for fishing reel and fishing reel

Publication Date: 2023.10.10 SHIMANO INC

AI summary

A one-way clutch unit for a fishing reel is disclosed. The one-way clutch is configured to brake a rotation of a shaft member of the fishing reel. The one-way clutch includes a rolling element and an outer member. The rolling element contacts the shaft member in a radial direction away from an axle of the shaft member. The outer member is disposed outside the rolling element in the radial direction. The outer member is configured to rotate in only one direction along a circumferential direction around the axle. The outer member includes a first external force receiving portion that receives a first external force in an axial direction of the shaft member.