Suspension Bushing Expanded End Section Twist Angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing suspension bushings of vertical type face challenges in increasing the twist angle while maintaining riding comfort and durability, as they tend to interfere with intermediate plates, leading to increased twist springs and stress strains, which compromise comfort and durability.
Innovation Solution
The design includes an inner cylinder with an expanded portion and end portions of small diameter, an intermediate plate with a curved surface and inclined expanded end section, and an elastic member with volume increasing portions, which allows for increased twist angle and improved axial spring strength without enhancing the twist spring, thereby reducing stress strains and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the twist spring is increased to reduce the twist angle, then the stability of the suspension bushing is improved, but the riding comfort deteriorates due to increased stiffness
Solution Approach 1:
The elastic member is designed with non-uniform cross-sectional areas along its height, creating different local stiffness characteristics. The upper and lower portions have different cross-sectional areas, allowing the suspension bushing to exhibit different spring rates at different locations, thereby achieving both stability and comfort simultaneously
2Ease of operation
If the intermediate portion of the inner cylinder is expanded into a spherical shape to strengthen the spring in orthogonal direction, then the riding comfort is improved, but the device complexity increases
Solution Approach 1:
Instead of changing the geometric shape (spherical expansion), the invention achieves the same functional effect by changing the cross-sectional area parameter of the elastic member at different heights. This parameter change approach maintains the cylindrical simplicity of the inner cylinder while achieving differential spring rates through the elastic member's varying cross-section
3Ease of operation
If annular recesses are formed on axial end portions to decrease the twist spring, then the riding comfort is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention achieves differential spring rates by varying the cross-sectional area parameter along the height of the elastic member, which can be accomplished through conventional molding or extrusion processes. This approach avoids the need for post-manufacturing operations like forming annular recesses, thereby reducing manufacturing precision requirements while achieving the same functional effect
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 configuration enhances the twist angle, decreases the twist spring, and increases the axial spring strength, improving riding comfort and durability by preventing interference with the intermediate plate and reducing stress strains, while simplifying manufacturing.
Implementation Method 1
an elastic member (28) elastically connecting the inner cylinder (22), the intermediate plate (26) and the outer cylinder (24) so as to function as a vibration isolating core element
Implementation Method 2
an expanded end section (44) which surrounds the end portion (34) and which is inclined such that an outward portion in the axial direction is gradually spaced apart from the end portion (34)
Data Source
AI summary
A suspension bushing includes an inner cylinder, an intermediate plate, an outer cylinder and an elastic member. An axis of the inner cylinder is arranged vertically and the inner cylinder is provided with an expanded portion in an axially central region. The expanded portion is enclosed by a curved surface section formed in an axially central region of the intermediate plate. An axially outward expanded end section is provided on either side of the curved surface section. An inside annular recess and an outside annular recess are provided on an axially outward end of the elastic member. When the twist is inputted, the outer cylinder and the intermediate plate are changed relative to the inner cylinder. However, due to the provision of the expanded end section, a twist angle is increased so that the intermediate plate is hard to interfere with an end portion of the inner cylinder.