A device for mounting a motor assembly of an electric appliance
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Solution Overview
Problem
Existing mounting devices for motor assemblies in electric appliances, such as vacuum cleaners, face a trade-off between achieving robust mounting and effective sealing while minimizing vibration transmission, as high stiffness is required for mounting and sealing but low stiffness is needed to reduce vibration transmission and noise.
Innovation Solution
A resilient mounting body with a specific design featuring a first motor contacting portion of lower radial stiffness, a second motor contacting portion with axial support components, and a connection portion of higher stiffness, allowing for independent optimization of mounting and sealing functions while reducing vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mounting body is designed with simple geometry and uniform stiffness, then the mounting function is robust and sealing is effective, but vibration transmission to the housing is excessive
Solution Approach 1:
The mounting body is designed with non-uniform stiffness distribution, where the first contacting portion has lower radial stiffness to reduce vibration transmission, while the connection portion has higher radial stiffness to maintain mounting stability. This local differentiation of mechanical properties allows simultaneous achievement of vibration reduction and mounting reliability.
Solution Approach 2:
The mounting body is divided into functionally distinct segments: a first contacting portion for motor assembly contact with low radial stiffness, and a connection portion with high radial stiffness. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between vibration reduction and mounting stability.
2Strength
If the radial stiffness of the mounting body is increased for robust mounting, then the motor assembly is securely mounted, but the extent of vibration transmission to the housing increases
Solution Approach 1:
Different radial stiffness values are assigned to different portions of the mounting body. The first contacting portion has lower radial stiffness to minimize vibration transmission, while the connection portion has higher radial stiffness to ensure secure mounting. This local quality differentiation resolves the contradiction between mounting strength and vibration reduction.
3Object-affected harmful factors
If the radial stiffness of the mounting body is decreased to reduce vibration transmission, then noise is reduced, but the mounting function becomes less robust and sealing effectiveness deteriorates
Solution Approach 1:
The mounting body incorporates spatially varying radial stiffness: lower stiffness in the first contacting portion for vibration reduction, and higher stiffness in the connection portion for maintaining robust mounting and sealing. This local differentiation allows noise reduction without compromising mounting reliability.
Solution Approach 2:
The mounting body is segmented into portions with different stiffness characteristics, allowing the first contacting portion to reduce vibrations while the connection portion maintains mounting robustness and sealing effectiveness.
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 solution effectively reduces vibration transmission from the motor assembly to the housing, maintaining proper mounting and sealing functions, and allows for more design flexibility by decoupling the need for high stiffness in mounting from low stiffness in vibration reduction, thereby reducing noise levels in electric appliances.
Implementation Method 1
a resilient mounting body for arrangement between the motor assembly and the housing
Implementation Method 2
the suspension rubbers also serve for reducing the extent to which vibrations of the motor assembly are transmitted to the housing on the basis of the resilience of the rubber material
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A device (10) for mounting a motor assembly of an electric appliance such as a vacuum cleaner in a housing (2) of the appliance comprises a resilient mounting body (11) which is intended for arrangement between the motor assembly and the housing (2). An inner peripheral portion (12) of the mounting body (11) comprises a first motor contacting portion (13), a second motor contacting portion (14) being provided with axial motor support components (19), and a connection portion (15) interconnecting the motor contacting portions (13, 14). A radial stiffness of the first motor contacting portion (13) is lower than a radial stiffness of the connection portion (15), so that the extent to which vibrations of the motor assembly are coupled into the mounting body (11) at the position of contact to the first motor contacting portion (13) can be at a minimum.