Pendulum Damping Device Spacer Assembly Method
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Solution Overview
Problem
Conventional pendulum-type damping devices for motor vehicle transmissions require larger dimensions due to protruding rivet ends, which weakens the load-bearing section and complicates manufacturing with simpler spacer shapes.
Innovation Solution
A method for assembling a pendulum-type damping device where spacers are force-fitted into openings of the mass parts, with ends flush to the outer surfaces, and optionally welded, using guidance studs for precise positioning and deformation to reduce overall dimensions and enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rivets are used to fasten spacers to mass parts, then the spacers can be held in position, but the load-bearing section is weakened and the overall dimensions increase
Solution Approach 1:
The harmful elements (protruding rivet heads) are removed from the system. Instead of using rivets that extend beyond the mass parts, the patent uses interference-fit spacers that are flush with the outer surfaces, eliminating the volume occupied by rivet heads and restoring the load-bearing section.
Solution Approach 2:
The mechanical fastening system (rivets) is replaced with an interference-fit system. The spacers are force-fitted into the mass parts, creating a press-fit connection that eliminates the need for protruding fasteners while maintaining structural integrity.
2Reliability
If rivets are used to connect spacers to mass parts, then the connection is secure, but the manufacturing process becomes more complex
Solution Approach 1:
The complex riveting process is removed from the manufacturing sequence. The spacers are simply force-fitted into the mass parts in a single operation, eliminating the multiple steps required for rivet installation, positioning, and securing.
Solution Approach 2:
The spacers are designed with dimensions that enable direct force-fitting into the mass parts without requiring preliminary drilling, countersinking, or rivet preparation. The interference-fit geometry is pre-configured to achieve secure connection upon assembly.
3Ease of manufacture
If spacer ends protrude axially from mass parts, then the spacers can be fastened with rivets, but the surrounding parts must be dimensioned larger
Solution Approach 1:
The protruding spacer ends and rivet heads are removed from the system. The spacers are force-fitted to be flush with the outer surfaces of the mass parts, eliminating the need for enlarged surrounding parts and reducing the overall envelope dimensions.
Solution Approach 2:
Instead of designing spacers that protrude and require enlargement of surrounding parts, the patent inverts the approach by designing spacers that are contained within the mass part boundaries, allowing for more compact overall dimensions.
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 method allows for a compact design, reducing the need for oversized components, improving the structural integrity by ensuring proper fitting and deformation of parts, and simplifying the manufacturing process while maintaining effective vibration damping.
Implementation Method 1
a roller being disposed between the spacer and the edge of the opening of the support
Implementation Method 2
Force-fitting of each end of the spacer into an opening of one of the parts of the mass
Data Source
AI summary
A method for assembling a pendulum-type damping device (1) includes the steps of force-fitting a first end of the spacer (17) into an opening (26) of a first part (3a) of a pendulum mass (3). A support (2) is positioned so that the spacer (17) spans a corresponding opening of the support (2). A roller is positioned between the spacer (17) and the edge of the opening of the support (2). The second end (17b) of the spacer (17) is force fit into an opening (26) of a second part (3b) of the mass (3).