Vibration-Damping Device Bracket Press-Fitting and Stopper Elastic Body Deformation
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Solution Overview
Problem
Existing vibration-damping devices face challenges in manufacturing a narrow or absent clearance between the stopper elastic body and the stopper wall portion, requiring thickness reduction in the vulcanization molding die or plasticization of the second attachment member.
Innovation Solution
A vibration-damping device design featuring a tubular first attachment member with a stopper wall portion and outer stopper elastic bodies, where the stopper elastic bodies are elastically deformed to protrude through penetration holes and contact the stopper wall portion when the bracket is press-fitted, eliminating the need for thickness reduction or plasticization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the part forming the clearance is reduced in the vulcanization molding die or the second attachment member is plasticized to make the stopper wall portion approach the stopper elastic body, then the clearance between the stopper elastic body and stopper wall portion becomes narrow or absent, but it becomes difficult to manufacture the vibration-damping device
Solution Approach 1:
The stopper elastic body is pre-installed on the first attachment member before the bracket is press-fitted. This preliminary positioning allows the stopper elastic body to be compressed by the bracket during press-fitting, enabling it to protrude through the penetration hole and contact the stopper wall portion without requiring precise pre-adjustment of clearance dimensions in the molding die
Solution Approach 2:
The invention changes the state of the stopper elastic body from a static component to a dynamically compressible one. During bracket press-fitting, the stopper elastic body undergoes elastic deformation, changing its position and shape to protrude through the penetration hole. This parameter change (position and shape) allows the clearance to be effectively eliminated without manufacturing precision issues
2Manufacturing precision
If the clearance between the stopper elastic body and stopper wall portion is made narrow or absent, then the press-fitting of the bracket is sufficient, but it may cause durability issues in the molding die or damage to the second attachment member
Solution Approach 1:
The stopper elastic body serves as a cushioning element between the bracket and the stopper wall portion. During bracket press-fitting, the stopper elastic body compresses and absorbs excess press-fitting force, preventing direct transmission of high stresses to the molding die and second attachment member. This beforehand cushioning protects these components from damage while ensuring sufficient press-fitting of the bracket
Solution Approach 2:
The stopper elastic body undergoes elastic deformation during bracket press-fitting, changing its compression state to absorb energy. This parameter change (compression degree) allows it to function as a shock-absorbing element, protecting the molding die and second attachment member from durability issues while maintaining press-fitting precision
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
Enables easy and accurate formation of a vibration-damping device with a narrow or absent clearance, preventing durability issues in the molding die and damage to the second attachment member, while ensuring sufficient press-fitting of the bracket.
Implementation Method 1
stopper elastic bodies being elastically deformed by the bracket and protruding to the outer circumferential surface side of the first attachment member through the penetration hole
Data Source
Figure 1
AI summary
A vibration-damping device (1) of the present invention includes a tubular first attachment member (11), a second attachment member (12) that is attached to any one of a vibration generating portion and a vibration receiving portion, an elastic body (13) that connects the first attachment member and the second attachment member with each other, and a bracket (B) that is connected to the remaining one of the vibration generating portion and the vibration receiving portion and is press-fitted into the first attachment member. The second attachment member includes a stopper wall portion (14) which surrounds the first attachment member from radially outside. A penetration hole (11b) which is open toward the stopper wall portion is formed in the first attachment member, and a stopper elastic body (19) covering the penetration hole is installed on an inner circumferential surface of the first attachment member. The stopper elastic body is elastically deformed by the bracket and protrudes to an outer circumferential surface side of the first attachment member through the penetration hole.