Torque Limiting Device Inclined Biasing Fishing Reel
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Solution Overview
Problem
Conventional torque limiting devices for fishing reels face challenges in increasing limiting torque without enlarging the device, as increasing the shearing force on the engagement member leads to increased size when trying to raise the torque.
Innovation Solution
A torque limiting device with a biasing member that biases the engagement member in a direction inclined relative to the radial direction of the first rotating member, allowing for increased limiting torque without increasing the device's size, and incorporating a recess with a pressing and sliding surface for smoother rotation and enhanced torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the inclination of the recess is set to be perpendicular to increase the limiting torque, then the limiting torque is increased, but the shearing force on the engagement member increases
Solution Approach 1:
The patent changes the inclination angle parameter of the recess from perpendicular (conventional) to a specific angled configuration. This parameter change allows the limiting torque to be increased while the shearing force on the engagement member is reduced, as the angled recess distributes the force more favorably between normal and shear components.
Solution Approach 2:
The patent employs a composite structure where the recess is formed with specific geometric characteristics (angled configuration) that combine favorable stress distribution properties. This composite geometric design allows simultaneous achievement of high limiting torque and low shearing force on the engagement member.
2Strength
If the engagement member is made thicker to reduce shearing force, then the shearing force is reduced, but the size of the torque limiting device increases
Solution Approach 1:
Instead of changing the dimensional parameter (thickness) of the engagement member, the patent changes the geometric parameter (inclination angle) of the recess. This parameter substitution allows the engagement member to maintain its original thickness while still achieving reduced shearing force, thereby avoiding an increase in device size.
3Strength
If the diameter of the recess is increased to reduce shearing force, then the shearing force is reduced, but the size of the torque limiting device increases
Solution Approach 1:
The patent substitutes the geometric approach (changing recess diameter) with an angular approach (changing recess inclination). By optimizing the inclination angle, the patent achieves reduced shearing force on the engagement member without increasing the recess diameter, thus maintaining a compact device size.
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 solution effectively raises the limiting torque of the torque limiting device without enlarging it, providing improved protection against impact forces and allowing for smoother operation during fishing line winding, while suppressing excess torque transmission to prevent damage.
Implementation Method 1
the biasing member biases the engagement member from the first rotating member toward the second rotating member. Here, the biasing member biases the engagement member in a direction that is inclined relative to the radial direction of the first rotating member
Data Source
AI summary
A torque limiting device includes a first rotating member, a second rotating member, an engagement member, and a biasing member. The biasing member biases the engagement member from a first rotating member toward a second rotating member. The biasing member biases the engagement member in a direction inclined relative to a radial direction of the first rotating member.