Traverse Camshaft with Variable Width Groove for Fishing Reel Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional traverse camshafts for fishing reels suffer from unnecessary turning of the engaging member, leading to abnormal noise and degradation of the operating feel due to uneven contact with the cam groove, as the engaging member's middle portion is thicker and both ends are thinner, causing it to turn excessively and contact intersecting portions improperly.
Innovation Solution
A traverse camshaft with an endless spiral cam groove featuring first and second groove sections of different widths, where the engaging member engages with narrower first groove sections before the intersecting portion and wider second groove sections after, restricting unnecessary turning and reducing noise and operating feel degradation, with an isosceles trapezoidal cross-sectional shape allowing for continuous machining of varying widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engaging member has a middle portion that is thicker and both ends that are thinner, then the engaging member can engage with the cam groove, but the engaging member turns unnecessarily and contacts the intersecting portion, causing abnormal noise and degradation of operating feel
Solution Approach 1:
The cam groove is designed with different widths in different sections: a first groove section with a narrower width and a second groove section with a wider width. This local variation in geometry allows the engaging member to be constrained in the first groove section (preventing unnecessary turning) while providing sufficient space in the second groove section for proper engagement, thereby eliminating abnormal noise without compromising engagement stability
Solution Approach 2:
The cam groove is divided into multiple functional sections (first groove section and second groove section) with different width characteristics. The first groove section specifically addresses the problem of unnecessary turning by providing a narrower constraint, while the second groove section facilitates proper engagement. This segmentation allows each section to perform its specific function independently
2Adaptability or versatility
If the engaging member turns excessively with respect to the cam groove, then the contact state changes, but the rotational operating feel degrades due to change in resistance
Solution Approach 1:
The first groove section is designed with a narrower width to locally constrain the engaging member, preventing excessive turning that would otherwise change the contact state and degrade rotational operating feel. This localized geometric feature maintains consistent resistance characteristics during rotation
3Ease of manufacture
If the cam groove has a fixed width at all points, then the engaging member can engage easily, but the tip end of the engaging member can catch in the intersecting portion, causing abnormal noise and degraded operating feel
Solution Approach 1:
Instead of maintaining a uniform width throughout the cam groove, the invention introduces a first groove section with a narrower width at a specific location. This localized width variation prevents the tip end of the engaging member from catching in the intersecting portion, thereby eliminating abnormal noise while still allowing for practical manufacturing using standard techniques
Data Source
AI summary
In a spinning reel, a traverse camshaft 21 is arranged to engage with an engaging member used to cause a bail arm and a spool to undergo a relative reciprocal movement. The traverse camshaft 21 has a shaft body 37 and a cam groove 38. The shaft body 37 is arranged to rotate in coordination with rotation of a handle assembly in at least a line reel-in direction. The cam groove 38 is formed in an external circumferential surface of the shaft body 37 and configured to engage with the engaging member. The cam groove 38 is also configured to intersect itself. The cam groove 38 has a first groove section 38b and a second groove section 38c on opposite sides of an intersecting portion 38a. The first groove section 38b and the second groove section 38c have different widths at the intersecting portion 38a.