Aggregate Bearing Plastic Core Metal Bolt Design
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Solution Overview
Problem
Classic engine mounts with metal bearing cores result in higher vehicle weights and costs due to metal usage, which conducts heat poorly, reducing rubber spring service life and increasing production costs, while existing assembly mounts suffer from low pull-out forces and ease of screw removal.
Innovation Solution
An assembly mount design featuring a plastic bearing core with a metal screw bolt anchored in a double screw configuration, where a second threaded bolt is mirror-symmetrically positioned to absorb preload forces and reinforced by encapsulation with plastic, enhancing pull-out resistance and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal bearing core is used, then the structural strength is improved, but the vehicle weight and production costs increase
Solution Approach 1:
The patent employs a composite structure combining plastic and metal materials. The bearing core is made of plastic material, while metal threaded bolts are integrated into it. This composite approach allows the plastic to provide the main structural form (reducing weight) while the metal bolts provide the necessary anchoring strength, thus resolving the contradiction between strength and weight.
2Strength
If a metal bearing core is used, then the structural integrity is improved, but the heat conduction to rubber springs increases, reducing service life
Solution Approach 1:
The plastic bearing core acts as a thermal barrier between the metal threaded bolts and the rubber springs. Plastic material has lower thermal conductivity compared to metal, thus reducing heat transfer from the metal components to the rubber springs. This preserves the structural integrity provided by metal while protecting the rubber springs from thermal degradation, extending their service life.
3Device complexity
If a single threaded bolt is used, then the device complexity is reduced, but the pull-out force and resistance to leveraging are insufficient
Solution Approach 1:
The single bolt connection is segmented into two separate threaded bolts positioned at different locations on the bearing core. This segmentation distributes the anchoring function across multiple points, increasing the total pull-out force and making it more difficult for the assembly to be levered apart. The segmentation approach maintains relatively simple device complexity while significantly improving the force resistance.
4Strength
If screws are cast into a core with high shank and sloping surface, then the anchoring is improved, but the screws can be easily levered out under transverse loads
Solution Approach 1:
The patent addresses the leveraging problem by adding a second threaded bolt at a different spatial position and orientation. This dimensional distribution of anchoring points creates a more stable geometric configuration that resists leveraging forces. The second bolt provides an additional anchoring dimension, making it much more difficult for the assembly to be pried apart under transverse or leveraging loads compared to a single bolt configuration.
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 reduces bearing core weight and costs, increases pull-out forces, and effectively transfers bending moments, providing improved durability and stability under transverse loads.
Implementation Method 1
the bearing core is made of plastic, which is injected around the second threaded bolt
Data Source
Figure 1
Figure 2
AI summary
The bearing has a bearing core (5) for connecting a rubber carrier body with an aggregate by an aggregate support arm. A screw bolt (6) is anchored in the bearing core and made of metal. The screw bolt is designed as a threaded bolt (6a) with a collar (6c), where the aggregate support arm is supported on the collar. Another threaded bolt (6b) is mirror-symmetrically formed at the collar with respect to an arrangement of the former threaded bolt at the collar and overmolded with plastic. The bearing core is made of plastic, and the threaded bolts exhibit same length and diameter.