Recoil Starter Ratchet Guide With Springless Friction Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing recoil starters with ratchet mechanisms require multiple components and complex assembly steps due to the need for industrial fasteners and springs to apply frictional resistance, increasing the number of components and assembly complexity.
Innovation Solution
A recoil starter design that uses a ratchet guide with a locking portion and tubular structure, where the ratchet guide is rotatably attached to the reel support shaft with frictional resistance generated by the locking portion and tubular portion, eliminating the need for industrial fasteners and springs, and enhancing adhesion through divided slits and a retaining ring for increased frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If industrial fasteners and springs are used to attach the ratchet guide and apply frictional resistance, then the ratchet guide can be securely attached and frictional resistance can be applied, but the number of components increases and assembly steps become complicated
Solution Approach 1:
The locking portion and frictional resistance application are merged into a single integrated structure. The ratchet guide includes a locking portion that directly engages with the reel support shaft, eliminating the need for separate industrial fasteners. The frictional resistance is applied through the contact between the locking portion and the shaft, removing the need for separate springs.
Solution Approach 2:
The patent extracts and eliminates unnecessary components (industrial fasteners and springs) by redesigning the attachment mechanism. The locking portion directly engages with the reel support shaft through a simplified structure that combines both attachment and frictional resistance functions, taking out the redundant fastening elements.
2Reliability
If industrial fasteners are used to rotatably attach the ratchet guide, then secure attachment is achieved, but the number of components increases
Solution Approach 1:
The attachment function is merged into the locking portion structure itself. The locking portion integrates both the attachment mechanism and the frictional resistance application, eliminating the need for separate industrial fasteners and reducing the total component count.
Solution Approach 2:
The locking portion serves multiple functions: it attaches the ratchet guide to the reel support shaft, applies frictional resistance, and enables rotational movement. This multi-functional design replaces multiple specialized components with a single universal element.
3Force
If springs are used to apply frictional resistance to the ratchet guide, then the desired frictional resistance is achieved, but the number of components increases
Solution Approach 1:
The spring component is extracted and eliminated from the design. Instead of using a separate spring to apply frictional resistance, the patent uses the contact friction between the locking portion and the reel support shaft, which naturally provides the required frictional force without additional components.
Solution Approach 2:
The system uses itself to generate the required frictional resistance. The contact between the locking portion and the reel support shaft automatically provides the necessary frictional force through their interaction, without requiring external spring elements to apply the force.
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 design reduces the number of components and assembly steps by eliminating the need for industrial fasteners and springs, while improving the adhesion of the ratchet guide to the reel support shaft, thereby enhancing the stability and frictional resistance, preventing the ratchet guide from falling off and simplifying the assembly process.
Implementation Method 1
a friction generated between the locking portion and the reel support shaft may apply the frictional resistance to the ratchet guide
Data Source
AI summary
A recoil starter includes: a starter case provided with a reel support shaft; and a ratchet guide rotatably attached to the reel support shaft in a state in which a frictional resistance is applied. The ratchet guide includes: a through hole into which the reel support shaft is insertable; and a locking portion configured to be engaged with the reel support shaft on an inner periphery of the through hole. A movement of the ratchet guide in an axial direction of the reel support shaft is restricted in a state in which the locking portion is engaged with the reel support shaft.