Motor Support and Battery Housing Structure for Impact Damping
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Solution Overview
Problem
Handheld work apparatuses, such as cut-off machines, are vulnerable to impact loads that can deform or damage the motor support unit, affecting the efficiency and function of the electric motor due to inertial forces from the battery pack.
Innovation Solution
The work apparatus features a motor support unit separate from the housing, with a receptacle housing for battery packs that can move relative to the motor support unit, decoupling inertial forces and using the housing as a damping means to prevent direct transmission to the motor support unit, and a compact design with symmetrical battery pack receptacles to optimize space and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the receptacle housing is rigidly fixed to the motor support unit, then structural stability is improved, but impact resistance deteriorates due to direct transmission of inertial forces
Solution Approach 1:
The housing serves as an intermediary element between the receptacle housing and the motor support unit. It decouples the direct connection, allowing the housing to absorb and dampen inertial forces from the battery pack while maintaining structural stability for motor mounting.
Solution Approach 2:
The mounting structure is segmented into three distinct components: the motor support unit, the housing, and the receptacle housing. This segmentation allows each component to have optimized functions - the motor support unit provides stable motor mounting, the housing provides damping, and the receptacle housing holds the battery pack.
2Manufacturing precision
If the motor support unit is made rigid to ensure precise motor positioning, then manufacturing precision is improved, but damage resistance to impact loads deteriorates
Solution Approach 1:
The housing acts as a protective intermediary that shields the rigid motor support unit from impact loads. The motor support unit maintains its rigidity for precise motor positioning, while the housing absorbs the shock of impacts, preventing force transmission to the motor support unit.
3Device complexity
If the battery pack receptacle is directly connected to the motor support unit, then device complexity is reduced, but reliability deteriorates due to vulnerability of critical components
Solution Approach 1:
The housing serves as a protective intermediary that shields the rigid motor support unit from impact loads. The motor support unit maintains its rigidity for precise motor positioning, while the housing absorbs the shock of impacts, preventing force transmission to the motor support unit.
4Object-affected harmful factors
If the receptacle housing is decoupled from the motor support unit, then impact resistance is improved, but structural stability deteriorates
Solution Approach 1:
The housing serves as an intermediary element between the receptacle housing and the motor support unit. It decouples the direct connection, allowing the housing to absorb and dampen inertial forces from the battery pack while maintaining structural stability for motor mounting.
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 enhances resistance to impact loads, prevents motor support unit damage, maintains operational precision, and provides a compact, easy-to-handle form factor for the apparatus.
Implementation Method 1
the housing can deform without corresponding forces and/or torques being transmitted directly from the receptacle housing to the motor support unit. Due to the deformation, preferably elastic deformation, of the housing, the inertial forces of the receptacle housing as well as of the at least one battery pack energy are absorbed
Implementation Method 2
the receptacle housing and the motor support unit are designed and arranged in relation to one another in such a way that the receptacle housing is able to move relative to the motor support unit in order to reduce, in particular to prevent direct transmission of inertial forces emanating from the receptacle housing to the motor support unit
Data Source
AI summary
A work apparatus includes: a housing; a motor support unit designed separately from the housing, the housing being fixed to the motor support unit. A drive motor is designed as an electric motor for driving a tool and is attached to the motor support unit. A receptacle housing designed separately from the motor support unit for receiving at least one battery pack for supplying the drive motor with electrical power is fixed to the housing. The receptacle housing and the motor support unit are designed and arranged relative to each other in such a way that the receptacle housing is able to move relative to the motor support unit in order to reduce, in particular to prevent, direct transmission of inertial forces emanating from the receptacle housing to the motor support unit in the event of an impact load on the work apparatus.