Cylindrical Vibration Isolator With Stopper-Limited Rubber Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cylindrical vibration isolation devices for vehicle auxiliary machines, such as electric compressors, face issues with excessive deformation and breakage due to low spring properties, leading to potential damage and environmental hazards from refrigerant leakage when subjected to large loads or collisions.
Innovation Solution
A cylindrical vibration isolation device with a novel structure featuring a stopper protrusion on the inner shaft member and opposing stopper parts on the outer bracket, limiting relative displacement and preventing excessive deformation and breakage by ensuring contact between these components, thereby maintaining the required low spring property while preventing contact with other members or the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring constant of the main-body rubber elastic body is reduced to achieve a soft spring property, then the vibration isolation performance is improved, but the deformation amount increases and breakage risk occurs under large loads
Solution Approach 1:
The patent applies beforehand cushioning by providing stopper protrusions and stopper parts that limit the deformation range of the rubber elastic body before excessive deformation or breakage can occur. The stopper mechanism acts as a preventive measure that restricts the maximum deformation amount under large loads or collision conditions, cushioning against potential breakage while maintaining the soft spring property for normal vibration isolation.
2Reliability
If the spring constant is reduced for soft spring property, then the vibration isolation performance is improved, but the deformation amount becomes excessively large under large loads
Solution Approach 1:
The stopper protrusions and stopper parts are positioned in advance to define a maximum deformation limit for the rubber elastic body. When the auxiliary machine undergoes large displacement due to collision or heavy load, the stopper mechanism engages beforehand to prevent excessive deformation, ensuring the deformation amount remains within safe limits while maintaining soft spring characteristics during normal operation.
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 device effectively limits excessive deformation and breakage of the rubber elastic body, preventing damage to the auxiliary machine and potential environmental pollution by ensuring stable support and reducing impact noise through integrated stopper mechanisms.
Implementation Method 1
a main-body rubber elastic body connecting the inner shaft member and the cylindrical part of the outer bracket
Implementation Method 2
the inner shaft member is provided with a stopper protrusion that protrudes toward the outer peripheral side at a position protruding in an axial direction from the main-body rubber elastic body, and the outer bracket is provided with a first stopper part having an axis-perpendicular contact surface opposing the stopper protrusion
Data Source
AI summary
Provided is a cylindrical vibration isolation device for vehicle auxiliary machine having a novel structure, in which a main-body rubber elastic body having a low spring property suitable for a vehicle auxiliary machine can be employed. A cylindrical vibration isolation device 10 for vehicle auxiliary machine is provided with an inner shaft member 16 and an outer bracket 14 attached to one of a vehicle auxiliary machine 32 and a vehicle-body-side support member 34. A cylindrical part 44 externally fitted over the inner shaft member 16 is provided to the outer bracket 14. The inner shaft member 16 and the cylindrical part 44 are connected by a main-body rubber elastic body 20. The inner shaft member 16 is provided with a stopper protrusion 24 that protrudes to the outer peripheral side at a position protruding in an axial direction from the main-body rubber elastic body 20. The outer bracket 14 is provided with a first stopper part 46 having an axis-perpendicular contact surface 48 opposing the stopper protrusion 24 in an axis-perpendicular direction, and a second stopper part 50 having an axial-direction contact surface 52 opposing the stopper protrusion 24 in the axial direction, at positions protruding in the axial direction from the main-body rubber elastic body 20.