Auxiliary Handle Vibration Damping for Power Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power tools like angle grinders experience significant vibrations due to unbalanced grinding discs and motor-transmission assembly, causing user discomfort and instability during operation, despite the use of auxiliary handles for damping.
Innovation Solution
A vibration damping assembly is integrated into the auxiliary handle, comprising a mass member and elastic elements, with a specific arrangement of springs and slots to achieve a natural frequency ratio between 0.7 and 1.3, effectively reducing tool vibrations and user discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an auxiliary handle is added to the housing, then the user can hold the power tool with both hands to achieve relatively stable operation, but the vibration will be transmitted to the user through the auxiliary handle, which will easily cause the user's physical discomfort
Solution Approach 1:
The patent introduces a vibration damping assembly as an intermediary component between the auxiliary handle and the housing. This assembly includes elastic elements and a mass member that act as a mediator to absorb and dampen vibrations before they reach the user's hand, thus resolving the contradiction between maintaining operational stability and reducing vibration transmission.
Solution Approach 2:
The patent converts the harmful vibration energy into beneficial damping effects by using the vibration damping assembly. The elastic elements and mass member transform the vibration energy into elastic deformation and kinetic energy of the mass member, ultimately dissipating it as heat, thus turning the harmful vibration into a beneficial damping mechanism.
2Object-affected harmful factors
If a vibration damping assembly with mass member and elastic elements is integrated into the auxiliary handle, then the natural frequency of the damping assembly can be aligned with the rotational frequency of the output shaft to minimize vibration transfer, but the device complexity increases
Solution Approach 1:
The patent employs a nested structure where the vibration damping assembly is integrated within the auxiliary handle. The mass member is positioned within the auxiliary handle housing, and the elastic elements are arranged between the mass member and the housing, creating a compact nested arrangement that reduces overall device complexity while maintaining effective vibration damping functionality.
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 vibration damping assembly significantly reduces power tool vibrations, enhancing user comfort and operational stability by aligning the natural frequency of the damping assembly with the rotational frequency of the output shaft, thereby minimizing vibration transfer to the user.
Implementation Method 1
a plurality of elastic elements arranged between the at least one mass member and a cavity wall of the accommodating cavity
Implementation Method 2
The vibration damping assembly significantly reduces power tool vibrations, enhancing user comfort and operational stability by aligning the natural frequency of the damping assembly with the rotational frequency of the output shaft
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Disclosed is a power tool which includes a housing, a motor, an output shaft, a working head, a transmission assembly, an auxiliary handle, and a vibration damping assembly. The housing is formed with a main handle configured for being held by a user. The motor is arranged inside the housing and includes a driving shaft. The working head includes an output shaft and an abrasive disc connected to the output shaft, and the output shaft is driven by the motor. The auxiliary handle includes a front end mounted at a position of the housing adjacent to the working head, and further includes a gripping portion extending along a center line. The vibration damping assembly includes a mass member and an elastic element. The auxiliary handle further includes an end cap arranged at a rear end of the gripping portion where the rear end is far away from the housing relative to a front end of the gripping portion. An accommodating cavity for accommodating the vibration damping assembly is formed around the gripping portion when the end cap is combined with the gripping portion. The elastic element is arranged between the mass member and a cavity wall of the accommodating cavity, and a ratio of a natural frequency W1 of the vibration damping assembly to a rotation frequency W2 of the output shaft in rotation is greater than or equal to 0.7 and less than or equal to 1.3. The power tool achieves a desirable vibration damping effect.