Electric Hammer Clutch Assembly Mode Switching Mechanism
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Solution Overview
Problem
Existing electric hammers have complex switching assemblies that complicate the conversion between hammer drill and drill modes, leading to increased machine dimensions and user inconvenience.
Innovation Solution
An electric hammer design featuring a simple structure with a clutch assembly and switching assembly that allows seamless switching between drill and hammer drill modes through a rotating sleeve and reciprocating impact block, driven by an electric motor, with a switching element that facilitates mode change without excessive operational steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complicated switching assembly is used to convert between hammer drill mode and drill mode, then the electric hammer can implement function conversion, but the structure becomes complicated and the machine dimension increases
Solution Approach 1:
The patent combines the switching assembly with the clutch assembly into an integrated unit. The switching element is disposed within the clutch assembly structure, allowing the clutch to serve dual purposes: both clutching engagement and mode switching. This merging eliminates the need for separate switching mechanisms, thereby simplifying the overall structure while maintaining the ability to convert between hammer drill and drill modes.
Solution Approach 2:
The clutch assembly is designed to perform multiple functions: it serves as both the clutching mechanism for engagement/disengagement and as the switching mechanism for mode conversion. The switching element, when actuated, utilizes the existing clutch assembly components to achieve mode changes, making the clutch assembly a multi-functional component that reduces overall device complexity.
2Adaptability or versatility
If a complicated switching assembly is used to convert between hammer drill mode and drill mode, then the electric hammer can implement function conversion, but the machine dimension increases causing inconvenience to user operation
Solution Approach 1:
By merging the switching assembly with the clutch assembly, the patent eliminates redundant structural components. The switching element is integrated within the clutch assembly's spatial envelope, meaning that mode switching functionality is added without requiring additional space outside the existing clutch assembly boundaries. This integration prevents increase in machine dimension while maintaining function conversion capability.
Solution Approach 2:
The switching element is nested within the clutch assembly structure. The switching element utilizes the internal space and structural features of the clutch assembly, placing one functional element inside another. This nesting approach allows the switching mechanism to occupy minimal additional space, thereby avoiding increase in overall machine dimension while still providing complete mode conversion functionality.
3Adaptability or versatility
If a complicated switching assembly is used, then the electric hammer can convert between modes, but it causes inconvenience to user operation
Solution Approach 1:
The integration of switching and clutching functions into a single assembly simplifies the user interface. Instead of operating separate switching mechanisms, the user interacts with a unified clutch assembly that handles both engagement and mode selection. This merging reduces the number of operational steps and controls the user must manage, thereby improving ease of operation.
Solution Approach 2:
The clutch assembly is designed to automatically manage mode switching through its integrated switching element. When the clutch engages or disengages, the switching element automatically transitions between states, enabling mode conversion without requiring separate manual intervention for switching. This self-service mechanism reduces operational complexity and improves user convenience.
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 simplifies the switching process, reduces the machine's dimensions, and enhances user convenience by allowing easy conversion between modes, improving operational efficiency.
Implementation Method 1
The impact assembly includes a swash bearing and an impact block capable of being driven by the swash bearing to reciprocate in the sleeve
Implementation Method 2
The electric motor is at least partially disposed in the housing... the mounting shaft is capable of being driven by the electric motor to rotate about a second axis
Implementation Method 3
the impact block is capable of outputting an impact force forward when moving in the sleeve
Data Source
AI summary
An electric hammer includes a housing, an electric motor, an output assembly, an impact assembly, a mounting shaft, a clutch assembly, and a switching assembly. The mounting shaft is rotatable about a second axis. When the electric hammer is in the drill mode, a sleeve of the output assembly rotates. When the electric hammer is in the hammer drill mode, the sleeve rotates and an impact block of the impact assembly reciprocates in the sleeve. The switching assembly is configured to switch the clutch assembly between a first state and a second state and includes a switching element. The switching element includes a forced end and a drive end, the output assembly moving along a first axis drives the forced end to move, and the drive end is configured to drive the clutch assembly to be switched to the first state.