Blower Motor Housing with Decoupling Units
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Solution Overview
Problem
Structure-borne noise and vibrations from blower motors in vehicle climatization devices are not effectively decoupled from neighboring components, leading to irritating noise transmission.
Innovation Solution
A housing arrangement for the blower motor featuring first and second decoupling units, made of elastic polymer or multi-layer materials, with substantially constant spring stiffness in axial, radial, or normal directions, positioned circumferentially between the motor and housing parts to mitigate noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid mounting is used to secure the blower motor to the housing, then mechanical stability is improved, but structure-borne noise and vibrations are transmitted to neighboring components
Solution Approach 1:
The patent introduces decoupling units as intermediary elements between the blower motor and the housing. These units comprise elastomeric material arranged in a circumferential ring, forming a mechanical interface that mediates between the rigid motor mounting requirements and the noise reduction goals. The elastomeric material acts as a mediator that absorbs vibrations while maintaining mechanical stability.
Solution Approach 2:
The decoupling units change the mechanical parameters of the mounting system by introducing elastomeric material with specific viscoelastic properties. This transforms the rigid mounting connection into a compliant interface that can dissipate vibrational energy, thereby reducing structure-borne noise while maintaining adequate mechanical stability.
2Object-affected harmful factors
If decoupling units with variable spring stiffness are used, then vibration isolation is improved, but manufacturing complexity increases due to tolerance compensation requirements
Solution Approach 1:
The patent applies local quality by creating circumferential zones of decoupling material around the motor mounting points. The elastomeric material is distributed in a circumferential ring pattern, providing localized vibration isolation at critical mounting locations while maintaining overall structural integrity. This localized approach achieves effective vibration isolation without requiring complex multi-point decoupling systems.
Solution Approach 2:
The decoupling units utilize composite material structures combining elastomeric material with rigid support elements. This composite approach provides both the compliance needed for vibration isolation and the structural rigidity required for stable mounting, achieving both vibration isolation and manufacturing simplicity through material composition rather than complex geometric designs.
3Object-generated harmful factors
If soft elastomeric material is used for decoupling, then vibration damping is improved, but mechanical strength for securing the motor is reduced
Solution Approach 1:
The decoupling units employ composite material construction combining elastomeric damping material with rigid support structures. The elastomeric layer provides vibration damping while the rigid framework maintains mechanical strength for secure motor mounting. This composite approach resolves the contradiction by distributing different material functions within a single integrated decoupling unit.
Solution Approach 2:
The patent optimizes the viscoelastic parameters of the elastomeric material to achieve maximum damping efficiency at the operating frequency range of the blower motor. By carefully selecting and tuning the material parameters, the system achieves effective vibration damping while maintaining adequate mechanical strength through the combined elastomeric-rigid structure.
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
Significantly reduces higher-order vibrations and noise, particularly the 12th, 24th, and 36th order frequencies, by providing uniform vibration isolation and compensating for manufacturing tolerances, while maintaining a soft suspension effect.
Implementation Method 1
a first decoupling unit arranged circumferentially between the underside of the blower motor and an inner bottom of the first housing part, and a second decoupling unit arranged circumferentially between the topside of the blower motor and an inner surface of the second housing part
Implementation Method 2
the spring stiffness of the first and the second decoupling units are substantially constant in an axial direction, a radial direction, or a normal direction
Data Source
AI summary
A housing arrangement has a blower motor including a rotation shaft that traverses through an underside and a topside of the blower motor, the rotation shaft being configured to mount a fan impeller thereupon, a first housing part that receives the blower motor, a second housing part that covers the blower motor received in the first housing part, a first decoupling unit arranged circumferentially between the underside of the blower motor and an inner bottom of the first housing part, and a second decoupling unit arranged circumferentially between the topside of the blower motor and an inner surface of the second housing part. Here, the spring stiffness of the first and the second decoupling units are substantially constant in an axial direction, a radial direction, or a normal direction.