Ratchet Wrench Snap-Ring Assembly for Lower-Cost Machining
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Solution Overview
Problem
Conventional ratchet wrenches require expensive T-shaped cutters and complex machining processes, leading to increased costs, labor, and difficulty in assembling and maintaining the internal components.
Innovation Solution
A ratchet wrench design featuring a wrench body with receiving recesses, a ratchet wheel, a mounting member, a pawl member, an elastic member, and a snap ring, which allows for simplified assembly and secure mounting of components using a snap ring and rotation portion, reducing the need for precise machining and facilitating easy disassembly for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal crescent cavity with two closed ends is used in the wrench body, then the positioning mechanism can be mounted, but it requires expensive T-shaped cutters and increases working cost
Solution Approach 1:
The internal crescent cavity is divided into two separate through grooves (first groove and second groove) that extend from opposite outer peripheral faces of the wrench body to the bottom. This segmentation allows standard cutting tools to access and work both grooves independently, eliminating the need for expensive T-shaped cutters while maintaining the structural integrity needed for mounting the positioning mechanism.
2Ease of manufacture
If a T-shaped cutter is used to work the internal crescent cavity, then the cavity can be formed, but the cutter shank is limited by the inner peripheral face and is easily broken due to excessive force
Solution Approach 1:
The single internal crescent cavity is segmented into two separate through grooves accessible from opposite sides of the wrench body. This allows the use of standard cutting tools with smaller, stronger shanks that can be supported from both ends, eliminating the need for oversized T-shaped cutter shanks that are prone to breaking under excessive force.
3Reliability
If the first groove has a stepped shape with larger and smaller diameters, then the positioning mechanism can be mounted, but it requires considering drill travel and increases working time
Solution Approach 1:
The stepped single-groove design is segmented into two separate through grooves of uniform diameter, each accessible from opposite outer peripheral faces. This segmentation eliminates the need for complex stepped drilling operations and multi-stage machining, allowing both grooves to be worked efficiently in one pass from each side, significantly reducing working time while maintaining the structural requirements for positioning mechanism mounting.
4Volume of moving object
If the diameter of the first groove is less than 12 mm, then the wrench body is compact, but it is difficult to cut the second groove by turning and wastes manual labor
Solution Approach 1:
Instead of attempting to machine a second groove in the compact wrench body using traditional turning methods, the design segments the cavity into two through grooves that are directly accessible from opposite outer peripheral faces. This segmentation allows the use of simpler drilling or milling operations that are more suitable for small diameters less than 12 mm, eliminating the difficulty and manual labor associated with trying to cut grooves in compact dimensions through turning.
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 design enhances assembly efficiency, reduces manufacturing costs, and simplifies maintenance by allowing for easy component replacement and secure mounting without complex machining, thus improving overall production efficiency and reducing material waste.
Implementation Method 1
The elastic member is elastically biased between the mounting member and the pawl member
Data Source
AI summary
A ratchet wrench includes a wrench body, a ratchet wheel, a mounting member, a pawl member, an elastic member, and a first snap ring. The wrench body has a first resting face and a second resting face. The ratchet wheel has a ratchet portion, a first annular groove, and a rotation portion. The mounting member has a receiving portion, a first restriction section, and a second restriction section. The pawl member has an engaging portion. The elastic member is biased between the mounting member and the pawl member. The first snap ring is snapped into the first annular groove. The rotation portion rests on the first resting face, and the first snap ring rests on the second resting face, so that the ratchet wheel, the mounting member, and the pawl member are limited by the rotation portion and the first snap ring.