Torque Wrench Retaining Unit Assembly via Preliminary Fixation
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Solution Overview
Problem
Conventional torque wrenches face difficulties in assembly due to the long stroke required for inserting the retaining block and the lack of a positioning mechanism, leading to increased time and cost in production.
Innovation Solution
A torque wrench design where the retaining unit is fixed at the end opening of the tubular body, with a blind hole and a through hole of different diameters, allowing the push rod's extension portion to slide and adjust the elastic unit effectively, facilitating easy assembly and reducing production costs through welding or integral formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the retaining block is disposed in the middle section of the tubular body, then the push rod can be connected to the driving head, but the stroke from the right side to the predetermined position is extremely long and there is no positioning mechanism, making it difficult for the assembler to insert the retaining block into the predetermined position
Solution Approach 1:
The retaining unit is pre-fixed at the end opening of the tubular body before the push rod is assembled. This preliminary positioning action eliminates the need for the assembler to manually position the retaining block during assembly, directly resolving the contradiction by providing easy assembly without requiring long stroke adjustment.
Solution Approach 2:
The end opening of the tubular body serves as an intermediary location where the retaining unit is fixed in advance. This intermediary positioning mechanism allows the push rod to be easily assembled without requiring the assembler to navigate the entire long stroke to find the correct position, thus improving ease of assembly.
2Reliability
If the retaining block is fixed by a plurality of pins that are inserted in the tubular body, then the retaining block can be secured, but the pin holes of the tubular body need to be aligned with the pin holes of the retaining block, requiring the assembler to spend a lot of time adjusting the position
Solution Approach 1:
The retaining unit is pre-fixed to the end opening of the tubular body using welding or integral formation before the pin assembly step. This preliminary fixation eliminates the need for time-consuming hole alignment during assembly, while the pins still provide reliable mechanical securing, thus resolving the contradiction between reliability and assembly time.
Solution Approach 2:
The welding or integral formation method replaces the traditional mechanical pin-based fixation system. This substitution eliminates the alignment requirement for pin holes while maintaining secure fixation, directly resolving the contradiction by reducing assembly time without compromising fixing reliability.
3Ease of manufacture
If the retaining unit is fixed in the tubular body by welding means or integrally formed, then the assembly process is simplified and production cost is reduced, but the extension portion must have precise diameter matching the blind hole for stable sliding
Solution Approach 1:
The design specifies that the extension portion has a diameter equivalent to the blind hole diameter, creating a precise fit for stable sliding. This parameter specification ensures that while the manufacturing process is simplified through welding or integral formation, the critical dimensioning maintains the necessary precision for proper function, resolving the contradiction between manufacturing ease and precision requirements.
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 simplifies the assembly process, reduces production costs, and enhances the ability to bear large elastic forces, improving the overall manufacturing efficiency and ease of assembly compared to conventional designs.
Implementation Method 1
An elastic unit is received in the tubular body. The elastic unit is inserted into the tubular body from the second end portion. One end of the elastic unit is abutted against the retaining unit.
Data Source
AI summary
A torque wrench includes a tubular body. One end of the tubular body is connected to a driving head, and the other end has a grip. The tubular body includes a retaining unit, an elastic unit, a push rod, and an adjusting unit therein. One side of the retaining unit comprises a blind hole corresponding to the push rod for accommodation of an extension portion, and the other side is formed with a through hole for insertion of a thin rod portion, furthermore, the through hole has a diameter less than that of the blind hole, the retaining unit enables to bear the elastic unit. The retaining unit can be fixed at an end opening of the tubular body by a welding means or integrally formed with the tubular body, so as to achieve the effects of facilitating production assembly and reducing production cost.