Elastomeric Mounting Insert for Hydraulic Damping and Noise Control
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Solution Overview
Problem
Elastomeric bearings with hydraulic damping in vehicles face challenges in maintaining service life and preventing noise development due to excessive vibration forces, which cause increased spring deflection beyond the free travel, leading to bumping and noise issues.
Innovation Solution
The design incorporates an insert part with an outer and inner shell connected by elastomeric webs, allowing precise damping adjustment, with a semicircular outer shell and saddle-shaped inner shell, and inflatable walls to manage forces and reduce contact friction, ensuring a liquid-tight connection and minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the end stop is made very soft to avoid bumping and noise, then the driving comfort is improved, but the service life of the bearing is reduced
Solution Approach 1:
The end stop is segmented into a hard component (insert part with outer and inner shell) and a soft component (elastomeric material between the shells). This segmentation allows the hard parts to provide structural support and limit travel, while the soft elastomeric material provides cushioning to prevent bumping and noise, thus resolving the contradiction between durability and comfort.
Solution Approach 2:
The end stop uses composite construction combining rigid insert parts made of durable material with elastomeric material. This composite structure enables the end stop to be both hard enough to maintain service life and soft enough to prevent noise and bumping during operation.
2Manufacturing precision
If the insert part is made with complex shell and web structure, then the damping precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The insert part is divided into outer shell, inner shell, and webs, allowing each component to be optimized independently for its specific function while maintaining overall precision. The segmentation enables precise damping adjustment through material selection and geometric parameters without requiring excessively complex integrated structures.
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 extends the service life of the bearing while preventing noise by effectively managing large vibration amplitudes and maintaining low contact friction, ensuring high driving comfort through controlled end stop engagement.
Implementation Method 1
High-frequency vibrations, which can originate, for example, from the engine of a vehicle or are introduced into the chassis via the road, are dampened by the liquid contained in the working chambers as they flow through the flow channels.
Implementation Method 2
The main force is absorbed by the elastomer body arranged between the bearing core and the bearing sleeve.
Data Source
Figure 1
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AI summary
The bearing has a core (2), an outer bearing sleeve (3), and an elastomer body (4) that acts as a bearing-spring and is arranged between the core and the sleeve. Two working chambers (5, 6) are filled with fluid and are connected with each other by a flow channel (7), where free path of the bearing is limited through end stoppers by the chambers. An inserting part (10) is arranged in one of the chambers and is inserted between the sleeve and the body, where the core is radially and axially curved in a stopper area.