Compact Torque Limiter for Fishing Reels
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Solution Overview
Problem
The existing torque limiting devices for fishing reels are not compactly formed due to the radial size increase caused by the spring member used to limit torque between the inner and outer members of the driven gear, which affects the device's overall design and functionality.
Innovation Solution
A torque limiting device is designed with a pin member having a spherical tip that protrudes and retracts, an urging member to push the pin member, and a locking recess on the rotary member, allowing for compact formation by restricting torque transmission when excessive force is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring member is used to limit torque between inner and outer members of the driven gear, then torque limiting function is achieved, but the radial size of the rotary member increases
Solution Approach 1:
The spring member is extracted from the rotary member (driven gear) and relocated to the shaft member. Only a pin member with a spherical tip and a recess are retained on the rotary member, significantly reducing its radial size while maintaining the torque limiting function through the pin's engagement and disengagement mechanism
Solution Approach 2:
The pin member with spherical tip acts as an intermediary between the shaft member and rotary member. The spherical tip engages with the recess to transmit torque normally, and when excessive torque occurs, the pin deflects to disengage, providing torque limiting without requiring a spring member on the rotary member
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 effectively limits torque transmission, preventing damage to the gear mechanism while allowing normal rotation, thus enabling a more compact and efficient design of the rotary member.
Implementation Method 1
an urging member is disposed in the shaft member, where the urging member is configured to urge the first pin member towards the rotary member
Data Source
AI summary
A torque limiting device for a fishing reel is provided. The torque limiting device is configured to limit torque between a rotatable shaft member and a rotary member disposed on an outer peripheral side of the shaft member in the fishing reel. The torque limiting device includes a first pin member being disposed in the shaft member, where the first pin member is configured to protrude towards and retract from the rotary member and the first pin member has a first spherical tip, an urging member is disposed in the shaft member, where the urging member is configured to urge the first pin member towards the rotary member, and a first recess is disposed on the rotary member to allow the tip of the first pin member to be engaged therewith.