Resin Dust Cover With Locking Protrusion For Rubber Insulator
Solution Overview
Problem
Conventional dust cover assemblies face challenges in preventing foreign matter intrusion and maintaining durability, particularly when the gap between the dust cover and cylinder is large, and when the dust cover is made of resin, it is difficult to achieve strong bonding with a rubber upper insulator, leading to issues with expansion and contraction.
Innovation Solution
A dust cover assembly with a resin-made dust cover and a rubber-made upper insulator, where the dust cover features a bellows tube portion with engaging grooves and a locking protrusion on the upper insulator, allowing secure attachment and preventing dislodgement, ensuring durability and effective prevention of foreign matter intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the dust cover is made of resin, then durability is improved, but bonding strength with rubber upper insulator deteriorates
Solution Approach 1:
The dust cover is divided into an upper portion (resin) and a lower portion (rubber), with each material used where it provides the most benefit. The upper resin portion provides durability, while the lower rubber portion provides bonding capability with the upper insulator.
Solution Approach 2:
The dust cover uses a composite structure combining resin and rubber materials. The upper portion is made of resin for durability, while the lower portion is made of rubber for bonding strength, creating a composite component that leverages the advantages of both materials.
2Adaptability or versatility
If the gap between dust cover and cylinder is large, then expansion and contraction is improved, but foreign matter intrusion risk increases
Solution Approach 1:
The lower portion of the dust cover is made of rubber, a flexible material that can expand and contract with the shock absorber while maintaining contact with the cylinder. This flexibility allows the dust cover to adapt to size changes without creating large gaps that would allow foreign matter intrusion.
3Object-affected harmful factors
If the dust cover is forced to undergo contraction deformation, then foreign matter prevention is improved, but tensile force on dust cover increases
Solution Approach 1:
The dust cover uses a composite structure where the upper resin portion provides tensile strength to resist contraction forces, while the lower rubber portion provides flexibility and bonding. This composite structure allows the dust cover to prevent foreign matter intrusion without exceeding the tensile strength limits of either material.
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 assembly achieves excellent durability and prevents foreign matter intrusion while allowing for expansion and contraction with the shock absorber, ensuring the dust cover remains securely attached to the upper insulator, enhancing its resistance to dislodgement and maintaining the assembly's integrity.
Implementation Method 1
at least one locking protrusion is formed on an inner peripheral face of the upper insulator having an annular shape and protrudes toward an inner peripheral side, while extending in the circumferential direction, and the engaging tube portion of the dust cover is inserted into the upper insulator, while the locking protrusion is inserted into the engaging groove and is locked therein in an axial direction
Implementation Method 2
an upper insulator made of rubber and configured to support a top end of a coil spring of the suspension mechanism
Data Source
AI summary
A dust cover assembly including: a dust cover made of resin and having a bellows tube portion; and an upper insulator made of rubber attached to a top end of the dust cover. An engaging tube portion is integrally formed with an upper part of the bellows tube portion of the dust cover. At least one engaging groove opens onto an outer peripheral face of the engaging tube portion and extends in a circumferential direction. At least one locking protrusion is formed on an inner peripheral face of the upper insulator having an annular shape and protrudes toward an inner peripheral side, while extending in the circumferential direction. The engaging tube portion of the dust cover is inserted into the upper insulator, while the locking protrusion is inserted into the engaging groove and is locked therein in an axial direction.