Dual-Bearing Reel Braking Layout for Direct Spool Control
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Solution Overview
Problem
Conventional dual-bearing reels face difficulty in efficiently braking the rotation of the spool due to the positioning of the braking unit indirectly through the rotation transmission mechanism, making it challenging to effectively control the spool's rotation.
Innovation Solution
The dual-bearing reel design positions the first braking unit in the first body portion to directly brake the spool via the first flange, with adjustable magnetic braking, and includes a second braking unit in the second body portion to provide additional friction-based braking, allowing for efficient and adjustable control of the spool's rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the braking unit is positioned in the second body portion to brake the rotation transmission mechanism, then the braking unit can be integrated with the existing structure, but the braking efficiency of the spool rotation is reduced due to indirect braking
Solution Approach 1:
The braking system is divided into two independent braking units: a first braking unit positioned in the first body portion that directly brakes the spool, and a second braking unit positioned in the second body portion that brakes the rotation transmission mechanism. This segmentation allows each braking unit to perform its function independently, achieving both direct braking efficiency and structural integration
Solution Approach 2:
The first flange of the spool serves as an intermediary element that enables the first braking unit to directly brake the spool rotation. The first braking unit applies braking force to the first flange, which then transmits this force to brake the spool's rotation efficiently
2Productivity
If the first braking unit directly brakes the spool via the first flange, then the braking efficiency is improved, but the device structure becomes more complex with additional body portions
Solution Approach 1:
The first body portion and second body portion are designed to serve multiple functions: they support the spool shaft, accommodate the respective braking units, and provide structural integrity to the reel. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while enabling direct braking
3Adaptability or versatility
If magnetic portions are added to the first flange and magnet portion to the first braking unit, then the braking force becomes adjustable, but the manufacturing complexity increases
Solution Approach 1:
The magnetic braking system replaces traditional mechanical contact braking. The magnet portion in the first braking unit and magnetic portions on the first flange create a non-contact braking force through magnetic attraction, eliminating the need for physical contact and wear-prone mechanical components, thereby simplifying manufacturing while providing adjustable braking force
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 efficient and easily adjustable braking of the spool rotation, enhancing the control over the spool's operation and improving the angler's experience.
Implementation Method 1
at least a part of the first flange includes a magnetic portion. The first braking unit has a magnet portion that is positioned facing the magnetic portion of the first flange
Implementation Method 2
The second braking unit is disposed in the second body portion and brakes the rotation of the spool by a friction force
Data Source
AI summary
A dual bearing reel includes a spool having a bobbin trunk and first and second flanges, a spool shaft including a first supported portion on a first flange side and a second supported portion on a second flange side, and the spool shaft configured to integrally rotate with the spool, a reel body including a first body portion rotatably supporting the first supported portion and a second body portion rotatably supporting the second supported portion; a level-wind mechanism to move a fishing line guide along an axial direction of the spool shaft in reciprocating fashion in conjunction with the rotation of the spool, a first braking unit disposed in the first body portion facing the first flange and configured to brake the rotation of the spool, and a rotation transmission mechanism in the second body portion and configured to transmit the rotation of the spool to the level-wind mechanism.