Blower Motor Vibration Damping with Integrated Damper Brackets
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Solution Overview
Problem
Existing blower motors in air conditioning devices for vehicles generate significant noise and vibration due to their integral motor case design, which are not effectively mitigated by conventional vibration-absorbing structures, leading to amplified motor vibration at high speeds and weakened vibration reduction effects.
Innovation Solution
A blower motor design featuring upper and lower bearings, a rotor, stator, fan, and a housing with integrated fixing brackets and dampers that absorb vibrations, including a first and second damper installed on the fixing brackets and a bearing housing that stores the bearings, to reduce noise and vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an O-ring is inserted into top and bottom of the blower motor to prevent noise, then vibration prevention effect is provided, but hardness increases according to compression which weakens the vibration prevention effect
Solution Approach 1:
The material parameter (hardness) is controlled by limiting compression to no more than 10% of the original thickness. This parameter change maintains the elastomeric properties of the O-ring while providing sufficient vibration damping, preventing the hardness increase that would weaken vibration prevention effectiveness.
Solution Approach 2:
Instead of fully compressing the O-ring for maximum sealing, the design applies partial compression (≤10%) that is sufficient for vibration damping while preserving the material's elasticity and vibration absorption capabilities, avoiding excessive hardening.
2Object-affected harmful factors
If separate structures are used for vibration absorption and bearing support, then vibration damping is provided, but assembly complexity increases and installation is difficult
Solution Approach 1:
The bearing housing is merged with the motor housing into a single integrated structure. The bearing housing protrudes from the motor housing and contains bearing mounting cavities, combining vibration damping (through O-rings) and bearing support functions into one unified component, simplifying assembly and installation.
Solution Approach 2:
The bearing housing structure serves multiple functions simultaneously: it provides vibration damping through integrated O-rings, supports and positions bearings through built-in cavities, and acts as a structural connection element between the motor housing and external components, reducing the need for separate parts.
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 effectively minimizes vibration and noise transmission within the vehicle, simplifies the assembly process, and improves productivity by stabilizing the coupling of dampers and simplifying the bearing housing installation.
Implementation Method 1
a damper for buffering which is coupled to a fixing bracket of an insulator
Data Source
AI summary
A blower motor includes upper and lower bearings 21 and 22 which are respectively installed on a top and a bottom of a rotating shaft 10; a rotor 30 which is installed around the rotating shaft 10; a stator 40 which gives a magnetic field to the rotor 30 to help the rotor 30 rotate; a fan 50 which is inserted into the top of the rotating shaft 10 to rotate; and a lower housing 60 which supports the bottom of the rotating shaft 10.