Impact Drill Movable Element Mode Switching
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Solution Overview
Problem
Existing impact drills have complex conversion structures that lead to oil leakage when switching between drilling and impact modes, due to multiple parts passing through the housing.
Innovation Solution
The impact drill design includes a movable element that moves between two positions to control the output shaft's axial movement, allowing for simple switching between modes without grease leakage, using a through hole in the housing and a spring for elastic force, and a stopping element to prevent backward movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conversion structure is used to switch between drilling and impact modes, then mode switching functionality is achieved, but the structure becomes complicated and oil leakage occurs
Solution Approach 1:
The patent extracts the mode switching function from a complex distributed conversion structure and concentrates it into a single movable element (such as a pin or collar) that axially moves between two positions. This simplified element controls the engagement between the output shaft and the impact mechanism, eliminating the need for complex conversion structures while maintaining full mode switching functionality.
Solution Approach 2:
The movable element serves multiple functions simultaneously: it acts as a mode switch, a positioning element, and a control mechanism for engaging/disengaging the impact function. By making this single element multi-functional, the patent eliminates the need for separate conversion structures, thereby simplifying the overall device while achieving the required adaptability.
2Adaptability or versatility
If multiple parts pass through the housing for mode conversion, then mode switching is enabled, but grease leakage occurs
Solution Approach 1:
The patent removes the need for multiple parts to pass through the housing by concentrating the mode switching function into a single movable element that operates entirely within the housing or through a minimal opening. This extraction eliminates the multiple grease leakage paths that would otherwise exist where parts penetrate the housing.
Solution Approach 2:
The patent merges the functions of multiple conversion parts into a single integrated movable element. This consolidation reduces the number of interfaces and penetration points through the housing, thereby minimizing grease leakage risks while maintaining full mode switching capability.
3Strength
If a simplified movable element design is used, then structural strength is enhanced and grease leakage is prevented, but mode switching mechanism becomes simpler
Solution Approach 1:
The patent merges the mode switching mechanism into a single movable element that integrates multiple functions (positioning, engagement control, mode selection). This merging simplifies the mechanism while simultaneously reducing the number of openings in the housing, thereby enhancing structural strength without sacrificing functionality.
Solution Approach 2:
The movable element is designed as a multi-functional component that performs mode switching, positioning, and engagement control simultaneously. This universal design reduces the overall complexity of the mechanism while maintaining full functionality, and allows the housing to have fewer openings, thus improving structural strength.
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 mode-switching mechanism, prevents grease leakage, and enhances the structural strength of the housing, leading to a longer service life and reliable operation.
Implementation Method 1
an elastic member configured to have an elastic force that makes the first impact block and the second impact block separate from each other
Data Source
AI summary
An impact drill includes an output shaft capable of rotating around a first axis and moving along the first axis, a housing, a first impact block fixedly connected to the output shaft, a second impact block, a stopping element for stopping the output shaft from moving backward, and a movable element mounted on the housing. The housing is formed with a through hole for accommodating the movable element. The through hole passes through the housing in a first line and the movable element is capable of moving to a first position and a second position along the first line. When the movable element moves to the first position, the movable element prevents the output shaft from moving backward. When the movable element moves to the second position, the movable element allows the output shaft to move backward.