Compressed Hub Damper Assembly and Maintenance
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Solution Overview
Problem
Existing torsional vibration dampers for internal combustion engines are labor-intensive to assemble and maintain, requiring special equipment to compress elastomeric components, which increases costs and complicates replacement of rubber components.
Innovation Solution
A torsional vibration damper design featuring separate front and rear hub members with an inertia mass held between them, using annular elastomeric rings for damping and allowing movement of the inertia mass relative to the hubs, enabling assembly without special equipment and easy replacement of elastomeric members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If an annular inertia member rests on an elastomeric ring compressed between the inertia ring and a hub, then vibration damping is provided, but the elastomeric component cannot be replaced without removing the entire damper from the crankshaft
Solution Approach 1:
The damper is divided into separable components: a hub assembly that remains on the crankshaft and an inertia member that can be independently removed. The elastomeric damping rings are positioned in a damping zone between the hub and inertia member, allowing the inertia member to be detached without removing the hub from the crankshaft. This segmentation enables replacement of elastomeric components while the damper remains partially installed.
2Ease of manufacture
If the elastomer is compressed during assembly of the damper, then the damping function is achieved, but special equipment is required which increases the cost of the damper
Solution Approach 1:
The assembly process utilizes dynamic compression where the inertia member is pressed against the elastomeric rings during installation. The elastomers are compressed between the hub and inertia member through the assembly force applied when installing the inertia member, eliminating the need for separate compression equipment. The design allows standard assembly tools to provide sufficient compressive force for the elastomeric damping rings to function.
3Quantity of substance
If a traditional damper design is used, then the structure is simple, but the inertia mass cannot be maximized within the available space
Solution Approach 1:
The inertia member is designed with a central opening that accommodates the hub assembly, allowing the hub to be nested within the inertia member's central space. The elastomeric damping rings are positioned in the damping zone between these nested components. This nesting arrangement maximizes the inertia mass within the available radial and axial space without increasing the overall damper footprint.
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 design maximizes inertia within minimal space, simplifies assembly and maintenance, reducing costs by eliminating the need for specialized tools and allowing elastomeric member replacement without removing the entire damper.
Implementation Method 1
torsional vibration dampers absorb vibration and, to a certain extent, reduce the amplitude of the vibrations by converting the vibrational energy to thermal energy as a result of the damping action
Implementation Method 2
Annular elastomeric rings are located between the hub members and the inertia mass to provide the vibration damping
Data Source
AI summary
A torsional vibration damper includes front and rear hub members with an inertia mass between the two hub members. Annular elastomeric rings are positioned between the front and rear hub members and the inertia mass holding the inertia mass. Fasteners extend through the front hub member, the inertia mass, and fixed to the rear hub member. A clearance between the fastener and the inertia mass allows relative motion to absorb torsional vibration.