Dry Clutch Friction Disk Assembly via Rivet Fastening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dry clutch friction discs face production inefficiencies due to the need for additional steps like gluing or pre-assembly with intermediate pieces, which increase costs and time, and suffer from reduced elasticity and progressiveness due to fin embedding in linings under tightening force.
Innovation Solution
A dry clutch friction disc is assembled directly by rivets alone, eliminating the need for gluing and pre-assembly, with a sheet metal spacer and crown-shaped veil featuring axially deformable fins, ensuring progressive torque transmission without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate piece (steel strip or foil) is glued to each lining between the lining and the veil, then resistance to fin embedding in linings is improved, but manufacturing complexity and production cost increase due to additional gluing steps
Solution Approach 1:
The patent extracts and eliminates the intermediate piece (steel strip or foil) from the assembly, removing the gluing step entirely. The lining is directly assembled to the veil using rivets, which prevents fin embedding while simplifying the manufacturing process. This extraction resolves the contradiction by achieving the protective function without the complex multi-step assembly process.
Solution Approach 2:
The rivet serves as a new intermediary element that replaces the glued intermediate piece. The rivet mechanically secures the lining to the veil and prevents fin embedding through its structural design, eliminating the need for adhesive bonding while maintaining the protective function. This mediator approach resolves the contradiction by providing a simpler mechanical solution.
2Reliability
If an intermediate piece is glued to each lining, then fin embedding is prevented, but production time and cost increase due to expensive adhesives and additional assembly steps
Solution Approach 1:
The patent removes the intermediate piece and gluing operation from the production process. The lining is directly riveted to the veil, eliminating the time-consuming adhesive application and curing steps. This extraction significantly improves productivity while maintaining the function of preventing fin embedding through the rivet structure.
Solution Approach 2:
The rivet provides a simple, inexpensive mechanical fastening solution that replaces expensive adhesives. The rivet is a one-time mechanical fastener that achieves the protective function without requiring costly chemical materials or complex application equipment, thereby improving production efficiency.
3Adaptability or versatility
If fins are made highly elastic with cutouts and openings, then progressive torque transmission is improved, but susceptibility to embedding in linings increases under tightening force
Solution Approach 1:
The rivet acts as a mediator that mechanically connects the elastic fins to the lining while preventing direct embedding. The rivet structure allows the fins to maintain their elasticity and progressive torque transmission capability while the rivet head or shaft prevents the fins from embedding into the lining material under tightening force.
Solution Approach 2:
The patent applies different properties to different parts of the fin structure. The fin body maintains high elasticity with cutouts and openings for progressive torque transmission, while the region interacting with the lining is controlled by the rivet to prevent embedding. This local differentiation resolves the contradiction between elasticity and embedding resistance.
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 approach results in a more economical production process while maintaining high elasticity and progressiveness, suitable for high-load applications like diesel engines, and meets centrifugation constraints effectively.
Implementation Method 1
These fins are alternately bent so as to include offset portions, on either side of a mean plane, capable of being elastically deformed under the effect of a clamping force. During tightening, the fins deform elastically, the offset portions coming to approach each other.
Implementation Method 2
the various components are joined by rivets alone. The term 'assemble by rivets alone' is understood to mean an assembly where the rivets alone are active in the transfer of forces between components of the assembly
Implementation Method 3
A crown-shaped friction lining is attached to each side of said support. During a clutch operation, said pressure plate clamps the friction disc against said reaction plate.
Data Source
Figure 1~3
AI summary
The invention relates to a dry-clutch friction disk comprising a web (2), at least one friction lining (3) and an intermediate part (6) between the web (2) and the fiction lining (3), wherein the web (2), the friction lining(s) (3) and the intermediate parts (6) are maintained together only using rivets (7) having one end bearing on counterbore faces (31) of the friction lining(s). The invention also relates to a method for making such a friction disk.