Spool Shaft Support Stability in Fishing Reels
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Solution Overview
Problem
Conventional fishing spinning reels experience nonsmooth handle operation due to increased slide resistance caused by contact pressure and frictional forces when handling high loads, as the spool shaft is either supported within the pinion gear's meshing region or near the rear end, leading to deformation and resistance during reciprocation.
Innovation Solution
The spool shaft is supported at its rear end by a slidable body, keeping it unsupported between the meshing region and the rear end, and is also supported on the inner surface of the pinion gear in front of the meshing region, eliminating contact with the pinion gear during downward loads and reducing slide resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the spool shaft is supported at two points within the pinion gear or at one point on the pinion gear and another point on the reel body near the rear end, then the spool shaft is adequately supported structurally, but the downward load applied to the pinion gear during handle rotation produces frictional slide resistance on the spool shaft outer circumferential surface, resulting in nonsmooth handle operation
Solution Approach 1:
The invention extracts the spool shaft support from the meshing region and rear end area by introducing a slidable body that supports the spool shaft rear end independently. This separation removes the source of frictional slide resistance while maintaining support stability through the slidable body's dedicated support function.
Solution Approach 2:
The slidable body acts as an intermediary component between the spool shaft and the reel body structure. It mediates the support function by providing a dedicated support point at the spool shaft rear end, isolating the spool shaft from direct contact with the pinion gear and reel body in critical regions, thereby eliminating frictional resistance.
2Device complexity
If the spool shaft is supported near the rear end of the pinion gear (close to the tooth portion), then the support structure is simplified, but when a downwardly urging load is applied to the pinion gear upon rotation of the handle, a force tends to bend the spool shaft via the supporting portion in front of the meshing region, radially deforming the bearing and producing frictional slide resistance
Solution Approach 1:
The invention extracts the spool shaft support from the problematic rear end region of the pinion gear by implementing support at the spool shaft rear end through the slidable body. This removes the bending force transmission path that causes bearing deformation and frictional slide resistance during handle rotation under load.
Solution Approach 2:
The slidable body serves as an intermediary support structure that decouples the spool shaft from direct mechanical interaction with the pinion gear rear end. This intermediary support prevents the transmission of bending forces from the pinion gear to the spool shaft and bearing, eliminating the root cause of frictional resistance while maintaining structural simplicity.
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 ensures smooth handle operation even under high load conditions by eliminating slide resistance and maintaining the spool shaft's stability, allowing for efficient and smooth winding without deformation-induced friction.
Implementation Method 1
the contact pressure between the inner surface of the pinion gear and the spool shaft is increased, resulting in increased slide resistance on the spool shaft
Implementation Method 2
the contact pressure between the inner surface of the pinion gear and the spool shaft is increased
Data Source
AI summary
A fishing spinning reel including: a pinion gear (8) having a rotor (2) fixed on an end of the pinion gear (8) and meshing with a drive gear (7) rotationally driven by rotational operation of a handle (5) rotatably supported on the reel body (1); a spool shaft (3a) inserted through the pinion gear (8) and having a spool (3) mounted on a front end thereof, the spool (3) holding a fishing line wound therearound; and an oscillation mechanism (12) configured to reciprocate the spool shaft (3a) back and forth in accordance with drive of the drive gear (7), wherein the spool shaft (3a) is not supported at a region from a meshing region (W) between the drive gear (7) and the pinion gear (8) to a rear end of the spool shaft (3a) where the spool shaft (3a) is supported by a slidable body (15) of the oscillation mechanism (12).