Integrally Molded Engine Mount with Stopper
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine mounts with integrally disposed vibration damping bushings face challenges in achieving sufficient spring constant in the front-back and left-right directions, leading to inadequate durability and increased production costs due to separate vulcanization components and assembly steps.
Innovation Solution
An engine mount design where the rubber mount elements and vibration damping bushing are integrally vulcanization molded using the same rubber material, with stopper portions to limit displacement and enhance durability, reducing the number of components and assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rubber mount elements and vibration damping bushing are made as separate vulcanization components, then the spring constant in the vertical direction can be properly established, but the spring constant in the front-back and left-right directions becomes insufficient and production costs increase
Solution Approach 1:
The patent merges the vibration damping bushing and rubber mount elements into a single integrally vulcanized component. The bushing is positioned within a through-hole of the upper fitting, and both the bushing and rubber mount elements are vulcanized simultaneously as one piece, eliminating the need for separate assembly steps and reducing component count while maintaining proper spring constants in all directions
Solution Approach 2:
The integrally vulcanized component serves multiple functions simultaneously: the bushing provides vibration damping in the vertical direction, while the rubber mount elements provide elastic support in all directions including front-back and left-right directions. This multi-functional design eliminates the need for separate components for different directional support
2Strength
If the vibration damping bushing is integrally mounted to the mount body, then the spring ratio can be corrected, but the number of production steps and manufacturing cost increase
Solution Approach 1:
The vibration damping bushing is pre-positioned within the through-hole of the upper fitting before the vulcanization process. This preliminary positioning ensures correct placement and orientation, allowing the bushing to be integrally vulcanized with the rubber mount elements in a single operation, thereby correcting the spring ratio without adding production steps
3Reliability
If stopper portions are provided to limit displacement, then durability is improved, but device complexity increases
Solution Approach 1:
Stopper portions are provided only at specific locations where displacement limitation is required, rather than throughout the entire structure. The stopper portions are locally integrated into the bushing or mount body at strategic positions to prevent excessive displacement while maintaining simplicity in other areas of the component
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 limits displacement in both the front-back and left-right directions, improving durability and reducing production costs by eliminating the need for separate vulcanization components and assembly steps.
Implementation Method 1
a bushing rubber integrally vulcanization bonded with the inner tube fitting and the upper fitting, and connecting the inner tube fitting and the upper fitting in a diametrical direction
Implementation Method 2
the bushing rubber undergoes elastic deformation
Data Source
AI summary
An engine mount has: a mount body including an upper and lower fitting of plate shape, and a pair of rubber mount elements of block shape; and an inner tube fitting situated within a through-hole in the upper fitting, formed at a location between the pair of rubber mount elements, and a vibration damping bushing integrally vulcanization bonded with the inner tube fitting and the upper fitting, and connecting the inner and upper fittings in the diametrical direction. The pair of rubber mount elements and the bushing rubber are integrally vulcanization molded. A stopper fitting is affixed within the inner tube fitting, with a vehicle front-back direction fitting stopper portion and/or a left-right direction fitting stopper portion being disposed on the stopper fitting, and a corresponding rubber stopper portion is disposed on the upper fitting side, with the fitting stopper portion and the rubber stopper portion being placed abutting one another.