Piston Damper Elastic Piece Absorbs Fitting Looseness
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Solution Overview
Problem
Conventional piston dampers experience looseness in the fitting hole relative to the axis due to long-term usage and temperature changes, leading to wobbling and a reduction in braking force.
Innovation Solution
A piston damper design that incorporates an urging device with an elastic piece portion in the fitting hole, which absorbs looseness and maintains a secure fit between the attachment portions and the axis, preventing wobbling and ensuring consistent braking action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple fitting hole structure is used for attachment portions, then ease of manufacture and assembly are improved, but reliability deteriorates due to looseness and wobbling from long-term usage and temperature changes
Solution Approach 1:
The attachment portion is designed with a movable elastic piece that can dynamically adjust its position. The elastic piece moves radially outward to accommodate loosening from wear and thermal expansion, maintaining continuous contact with the axis to prevent wobbling while preserving the simple fitting hole structure.
Solution Approach 2:
The elastic piece changes its physical state from a compressed state during initial assembly to an expanded state as wear and thermal effects occur. This parameter change allows the attachment portion to adapt to dimensional changes in the axis and fitting hole over time, maintaining reliable connection without complex design.
2Adaptability or versatility
If the fitting hole is made loose to accommodate thermal expansion, then adaptability to temperature changes is improved, but manufacturing precision deteriorates due to wobbling and loss of braking force
Solution Approach 1:
The elastic piece performs self-adjustment within the fitting hole. As temperature changes cause expansion or contraction of the axis and fitting hole, the elastic piece automatically moves to maintain optimal contact, eliminating the need for pre-compensated clearance or complex temperature-compensating mechanisms.
Solution Approach 2:
The elastic piece is pre-compressed during assembly to create an initial interference fit. This beforehand cushioning provides immediate precision while allowing future expansion to accommodate thermal effects, preventing both initial wobbling and future loosening.
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 prevents wobbling and maintains excellent braking performance by absorbing looseness and heat deformation, ensuring reliable attachment and prolonged durability without the need for additional components or design changes.
Implementation Method 1
an urging device absorbing looseness of the fitting hole relative to the aforementioned axis... Each of the attachment portions... includes an urging device absorbing looseness... The elastic piece portion is deformed according to an arc-like slit
Implementation Method 2
the piston damper can easily be assembled... to damp a movement of the other member relative to one member among both the members... the piston reciprocatingly disposed inside the cylinder... the rod including an attachment portion moved synchronously with the piston
Data Source
AI summary
A piston damper has a cylinder including an attachment portion; a piston reciprocatingly disposed inside the cylinder; and a rod including an attachment portion that is moved synchronously with the piston. Each of the attachment portions of the cylinder and the rod is adapted to connect to different one of a first member and a second member to damp a movement of the other member relative to one member among both the members. At least one of the attachment portion of the cylinder and the attachment portion of the rod is formed with a fitting hole, and the attachment portion is axially supported in a fitted state between the fitting hole and an axis relative to at least one of the first member and the second member, and includes an urging device absorbing looseness of the fitting hole relative to the axis.