Rebuildable Motor Mount Assembly for Vibration Isolation
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Solution Overview
Problem
Current vehicular motor mounts face challenges with vibration and torque transmission due to increased engine power, leading to wear and leakage issues, especially in luxury and performance cars, where they become consumable parts and pose risks of motor collision with other components.
Innovation Solution
A universally designed motor mount system featuring a polyurethane conical bushing with a hollowed-out lower region, a rebuildable design with integrated polymer bushings and a concave capture housing, and a two-assembly system with upper and lower bump stops to absorb vibrations and prevent direct connection between the engine and frame, allowing for easy replacement and adaptation to various vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water filled bladders are used to cushion motor movement, then vibration isolation is improved, but the bladders leak and wear out over time
Solution Approach 1:
The patent changes the material parameter from water-filled bladder to solid polyurethane foam with specific density (1.0 to 2.0 pounds per cubic foot) and durometer hardness (40 to 80 Shore A). This material transformation eliminates leakage while maintaining vibration isolation properties, resolving the contradiction between initial vibration cushioning and long-term durability.
Solution Approach 2:
The motor mount uses a composite structure combining polyurethane foam material with a fabric cover layer. This composite construction provides both the cushioning properties needed for vibration isolation and the structural integrity required for extended lifespan without leakage or degradation.
2Reliability
If larger water bag style motor mounts are used, then vibration cushioning is improved, but clearance between motor and frame is reduced
Solution Approach 1:
The patent employs a fabric cover as a flexible shell that encloses the polyurethane foam cushioning material. This flexible cover allows the motor mount to provide substantial cushioning while maintaining a compact profile that preserves clearance between the motor and frame, unlike rigid larger structures.
Solution Approach 2:
The motor mount is designed with a specific geometric configuration including a top surface, bottom surface, and side surfaces that optimize the distribution of cushioning force. This dimensional optimization allows effective vibration isolation without increasing the overall footprint or reducing critical clearances.
3Productivity
If motor mounts are positioned closer to exhaust manifold, then space utilization is improved, but heat exposure causes leakage
Solution Approach 1:
The patent selects polyurethane foam with specific thermal and mechanical properties including durometer hardness of 40 to 80 Shore A and density of 1.0 to 2.0 pounds per cubic foot. These parameter selections provide heat resistance that prevents degradation and leakage under exhaust manifold heat exposure while maintaining compact dimensions for efficient space utilization.
Solution Approach 2:
The combination of polyurethane foam core with fabric cover creates a composite structure with enhanced thermal stability. The fabric cover provides an additional layer of thermal protection, allowing the motor mount to withstand high temperature environments near exhaust manifolds without compromising integrity or cushioning performance.
4Strength
If stronger couplings are used to withstand greater torque loads, then motor stability is improved, but vibration transmission to frame increases
Solution Approach 1:
The patent optimizes the polyurethane foam density parameter to 1.0 to 2.0 pounds per cubic foot, which provides sufficient structural strength to withstand high torque loads from modern high-performance engines while simultaneously maintaining vibration isolation properties. This parameter optimization resolves the contradiction between strength and vibration transmission.
Solution Approach 2:
The composite construction of polyurethane foam enclosed in fabric cover creates a coupling that combines the strength needed for torque load capacity with the damping characteristics that reduce vibration transmission. The fabric cover adds structural integrity while the foam core provides vibration isolation, achieving both requirements simultaneously.
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 minimizes ride harshness across different frequency conditions, extends the motor mount's lifespan, and prevents motor collisions by providing a durable, cost-effective, and adaptable solution for various vehicle types.
Implementation Method 1
a vehicular motor mount with a motor attachment assembly and a frame attachment assembly coupled together but not directly connected
Implementation Method 2
replaceable polyurethane conical bushing with a hollowed out lower region
Implementation Method 3
a two assembly motor mount system for a plethora of vehicles that that utilizes a universal polymer bushing and universal concave capture housing
Implementation Method 4
upper and lower bump stops to absorb vibrations and prevent direct connection between the engine and frame
Implementation Method 5
a concave capture housing that is directly connected to the base plate that loosely constrains the polymer bushing and the proximal end of the post therein
Data Source
AI summary
A vehicular motor mount made of a motor mount assembly and a frame mount assembly made of four components: a base plate, a capture ring, a post and a bushing. The post mechanically connects directly to the engine mount bracket and the base plate directly connects to the subframe of the vehicle. The polymer bushing is bonded directly to the post. The concave capture ring is directly connected to the base plate forming a capture housing with a cavity wherein the post and bushing of the motor mount assembly are constrained but not directly connected to the base plate or capture ring of the frame mount assembly. With no direct connection between the two assemblies, the engine is not directly connected to the subframe. This improves vehicle's ride. The bushing and the capture ring are common to all vehicular motor mounts. The motor mount may be replaced in pieces rather than in its entirety.