Non-Adhesive Engine Mount Rubber Elastic Body Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional four-point vibration damping support structures for transverse engine type power units face challenges in achieving both durability and low spring characteristics for engine mounts, particularly on the transmission side, due to limited mounting space and the resulting restrictions on the size of the rubber elastic body.
Innovation Solution
The engine mount design features a non-adhesive connection between the main rubber elastic body and the outer tube member, allowing for reduced constraining forces and stress concentration, enabling low spring characteristics and improved durability while maintaining compactness, and includes a fixed position adjustment mechanism to absorb dimensional errors and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the engine mount LhMt on the transmission side is made more compact to fit limited mounting space, then the mounting space requirement is reduced, but the volume of the rubber elastic body becomes smaller making it difficult to achieve both required durability and low spring characteristics
Solution Approach 1:
The patent divides the engine mount into separate functional components: the rubber elastic body for vibration damping and the metal fittings for structural support and mounting. This segmentation allows each component to be optimized independently - the rubber body can be sized for vibration damping performance while the metal fittings provide the necessary structural strength, achieving both compactness and reliability
Solution Approach 2:
The engine mount uses a composite structure combining rubber material for the elastic body with metal materials for the fittings and mounting components. This composite approach allows the rubber portion to provide low spring characteristics and vibration damping while the metal portions provide durability and structural integrity, resolving the contradiction between compact size and performance requirements
2Strength
If adhesive connection is used between the rubber elastic body and outer tube member, then connection strength is improved, but constraining forces and stress concentration increase reducing durability and preventing stick slip prevention
Solution Approach 1:
The patent extracts the adhesive connection method and replaces it with a mechanical interference fit system. The outer tube member is designed with dimensional tolerances that create a press-fit connection with the rubber elastic body, eliminating the need for adhesives while preventing stick slip through controlled mechanical engagement. This removes the harmful effect of adhesive-related stress concentration while maintaining connection strength
Solution Approach 2:
The patent changes the connection mechanism from chemical bonding (adhesive) to mechanical bonding (interference fit). By adjusting the dimensional parameters of the outer tube member and rubber elastic body interface, the design achieves both strong connection and stick slip prevention through controlled mechanical interference, improving durability without sacrificing connection strength
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
This design effectively prevents stick slip and noise transmission, ensures stable vibration damping performance, and allows for a more compact engine mount configuration without compromising durability or vibration damping effectiveness.
Implementation Method 1
a main rubber elastic body fixed to the inner shaft member while being attached to the outer tube member non-adhesively such that the inner shaft member and the outer tube member are elastically connected by the main rubber elastic body
Implementation Method 2
power unit vibration damping support structure which gives vibration damping support to a power unit on a vehicle body
Data Source
AI summary
An engine mount for use in a power unit vibration damping support structure configured to be mounted on a transmission side in a state without a distributed support load of a weight of the power unit being applied, the engine mount including: an inner shaft member; an outer tube member arranged separated to an outer circumference side of the inner shaft member; and a main rubber elastic body fixed to the inner shaft member while being attached to the outer tube member non-adhesively such that the inner shaft member and the outer tube member are elastically connected by the main rubber elastic body, wherein the outer tube member is configured to be attached to the power unit, and the inner shaft member is configured to be attached to a vehicle body.