Spinning Reel Gear Disc Threaded Coupling Prevents Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spinning fishing reels face issues with gear disc deformation due to excessive compression, leading to jamming and difficulty in dismantling, and increasing manufacturing costs when using stronger materials like stainless steel to enhance structural strength.
Innovation Solution
A spinning fishing reel design featuring a gear disc with internal thread portions and a stop portion, coupled with a handle assembly that includes a drive shaft with external threads, preventing excessive compression and deformation, allowing for smooth operation and maintenance without the need for high-strength materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gear disc is made by zinc material, then the manufacturing cost is low, but the structural strength is insufficient causing the shaft tube end portion to be expanded and deformed
Solution Approach 1:
The patent uses a composite structure where a shaft sleeve made of high-strength material (such as stainless steel or aluminum alloy) is sleeved onto the drive shaft and pressed against the shaft tube end portion. This shaft sleeve reinforces the weak zinc gear disc, providing the necessary compressive strength to prevent deformation while keeping the main gear disc body made of cost-effective zinc material.
2Strength
If the handle is tightened up as much as possible to ensure firm coupling, then the coupling strength is improved, but the shaft tube end portion is excessively compressed causing expansion and deformation
Solution Approach 1:
The shaft sleeve acts as an intermediary element between the handle's drive shaft and the gear disc's shaft tube. It absorbs and distributes the compressive force from the shaft sleeve pressing against the shaft tube end portion, preventing excessive localized compression that would cause the shaft tube to expand and deform, while still providing firm coupling.
Solution Approach 2:
The shaft sleeve is designed with a pressing force that provides beforehand cushioning to the shaft tube end portion. By pre-compressing the shaft tube end portion within acceptable limits, it prevents further deformation when the handle is tightened, thus protecting the shaft tube from excessive compression and maintaining its shape.
3Strength
If the shaft tube end portion is compressed by the shaft sleeve, then the coupling firmness is improved, but the bearing becomes jammed and difficult to remove
Solution Approach 1:
The shaft sleeve applies localized compression only to the shaft tube end portion, leaving the rest of the shaft tube and bearing areas unaffected. This localized approach maintains coupling firmness at the connection point while preventing deformation that would affect the bearing's smooth operation and ease of removal.
4Strength
If the gear disc is made by stainless steel to enhance structural strength, then the strength is improved, but the manufacturing cost will substantially increase
Solution Approach 1:
Instead of making the entire gear disc from expensive stainless steel, the patent applies high-strength material only locally where needed - in the shaft sleeve that contacts the shaft tube end portion. The main gear disc body remains made of cost-effective zinc material, achieving the necessary strength at the critical connection point while minimizing overall manufacturing cost.
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 ensures a firm and secure coupling of the handle to the gear disc, preventing deformation and jamming, facilitating easy maintenance and smooth fishing line winding while reducing manufacturing costs by not requiring high-strength materials.
Implementation Method 1
The drive shaft is provided at an outer periphery thereof with an external thread portion screwingly threaded into the internal thread portion of the gear disc
Data Source
AI summary
A spinning fishing reel includes a housing, a line spool reciprocatingly moveable relative to the housing, a rotor rotatable relative to the line spool, a gear disc rotatably mounted inside the housing, and a handle assembly. The gear disc includes a shaft tube, and an internal thread portion and a stop portion both provided at an inner wall of the shaft tube. The handle assembly includes a handle and a drive shaft having a first end pivotally connected with the handle. The drive shaft has an external thread portion engaged with the internal thread portion of the gear disc in a way that the drive shaft is penetrated through an opening of the housing and inserted into the shaft tube of the gear disc, and a second end of the drive shaft is abutted against the stop portion of the gear disc.