Impact Wrench Axial Switching Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing impact wrenches lack a simple and efficient mechanism to switch between percussion and non-percussion modes, limiting their versatility in screwdriving and drilling applications.
Innovation Solution
An impact wrench design featuring an actuating means with a V-groove hammer mechanism and an axially displaceable adjusting ring or pin that allows for easy switching between operational modes by controlling the engagement and disengagement of the hammer and drive shaft, enabling both rotational and axial movements to facilitate torque delivery with or without percussion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switching mechanism is added to enable both percussion and non-percussion modes, then the versatility and adaptability of the impact wrench are improved, but the device complexity increases
Solution Approach 1:
The actuating means combines multiple functions into a single component: it blocks the hammer's axial movement to disable percussion mode, and simultaneously blocks the relative rotational movement between hammer and drive shaft to enable non-percussion screwdriving mode. This merging of blocking functions into one actuating means reduces the number of separate components needed for mode switching.
Solution Approach 2:
The actuating means serves multiple purposes: it acts as both a percussion disablement mechanism and a rotational coupling mechanism. By designing the actuating means to perform both blocking functions, the patent achieves multi-functionality that reduces overall device complexity while maintaining versatility.
2Adaptability or versatility
If the hammer is constantly engaged with the anvil, then the impact function is blocked, but the rotary drive of the output shaft is also prevented
Solution Approach 1:
The patent separates the blocking of axial movement (for impact function) from the blocking of rotational movement (for rotary drive). The actuating means can block axial movement of the hammer independently while allowing rotational movement between the hammer and drive shaft, enabling selective disablement of percussion mode without preventing screwdriving operation.
Solution Approach 2:
The actuating means acts as an intermediary mechanism that selectively blocks only the axial movement of the hammer relative to the drive shaft, while permitting rotational movement. This selective blocking allows the hammer to remain engaged with the anvil for impact function while still enabling the drive shaft to rotate for screwdriving operations.
3Device complexity
If the actuating means blocks both axial and rotational movements, then the hammer is fixed, but the simplicity of the switching mechanism is reduced
Solution Approach 1:
The actuating means merges the blocking of axial movement and rotational movement into a single actuating component. This consolidation maintains simplicity in the switching mechanism while providing comprehensive control over both types of movement, avoiding the need for separate actuating components for each blocking function.
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
Enables seamless switching between percussion and non-percussion modes, enhancing the tool's versatility for screwdriving and drilling tasks while reducing vibrations and improving torque control.
Implementation Method 1
The system receives kinetic energy from the drive side in the form of torque and speed, which is temporarily stored in an assembly such as a spring or a rotating mass
Implementation Method 2
The system receives kinetic energy from the drive side in the form of torque and speed, which is temporarily stored in an assembly such as a spring or a rotating mass
Implementation Method 3
The control mechanism ensures that the energy is released to the anvil for a limited time so that the connection is released again when the stored energy has been released
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The wrench has an actuating unit (23) i.e. axially displaceable setting ring (22), for switching an impact mechanism between an operating mode in which the mechanism is switched on, and an operating mode in which the mechanism is switched off. The actuating unit is in rotationally fixed engagement with a drive shaft (30) or a hammer (20), or is not engaged with the hammer or the shaft, when the mechanism is switched on. The actuating unit is in rotationally fixed engagement with the hammer and the shaft, when the mechanism is switched off, and is axially movable to switch the mechanism.