Impact Tool Housing Support Portion Axial Dimension Reduction
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Solution Overview
Problem
Existing impact tools have a housing design that is not reasonably optimized, leading to complex installation, excessive axial dimension, and inconvenient operation for users.
Innovation Solution
The impact tool design includes a housing with a support portion that forms sliding friction with the main shaft, reducing the need for additional bearings and simplifying the structure, while a transmission assembly with a planetary gearset efficiently transmits power to the impact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional bearing structures are used to support the main shaft, then the main shaft can rotate smoothly, but the axial dimension of the housing increases and the structure becomes more complex
Solution Approach 1:
The support portion is integrated directly into the inner wall of the first housing, merging the bearing function with the housing structure itself. This eliminates the need for separate bearing components and reduces the axial dimension of the housing while maintaining smooth rotation of the main shaft.
Solution Approach 2:
The housing structure serves multiple functions: it provides structural support, contains the impact assembly, and simultaneously acts as the bearing support through the integrated support portion. This multi-functionality reduces the overall number of components and simplifies the structure.
2Reliability
If multiple separate components are used for housing and support structures, then each component can be optimized independently, but the installation becomes more complicated and the device complexity increases
Solution Approach 1:
The support portion is formed as an integral part of the first housing, either through direct forming or rigid connection. This merging of components simplifies the assembly process and reduces installation complexity while maintaining the reliability benefits of optimized structural design.
3Ease of operation
If a sliding bearing with lubricant is used, then the sliding friction with the main shaft is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The hardness of the support portion is specifically controlled to be greater than HRB40, creating a hard-to-soft friction pair with the main shaft. This parameter optimization reduces sliding friction and wear without requiring complex lubrication systems or specialized bearing components.
Solution Approach 2:
The support portion itself provides the friction-reducing function through its material properties and surface characteristics. The hard material surface naturally minimizes friction with the rotating main shaft, making the system self-sufficient without requiring external lubrication mechanisms.
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 overall axial dimension of the impact tool, making it more user-friendly and easier to operate, while maintaining efficient power transmission and impact force delivery.
Implementation Method 1
a support portion that forms sliding friction with the main shaft in the direction of rotation of the main shaft
Implementation Method 2
the sliding bearing is made of powdered metal or steel and impregnated with a lubricant. the sliding bearing gradually releases the lubricant over time during the normal operation of the impact tool
Data Source
AI summary
An impact tool includes a housing; an electric motor including a motor shaft rotating about a first axis; an output shaft used for outputting power and rotating about an output axis; and an impact assembly used for providing an impact force for the output shaft and including a main shaft, where the main shaft is driven by the motor shaft to rotate about an axis of the main shaft. The housing includes a first housing for accommodating at least part of the main shaft, and a support portion that forms sliding friction with the main shaft in the direction of rotation of the main shaft is formed on or connected to an inner wall of the first housing.