Twist Lock Thrust Washer Friction-Fit Assembly
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Solution Overview
Problem
Existing thrust washers for torque converters require precise alignment of snap-fitting parts, which can be costly and inefficient.
Innovation Solution
A thrust washer assembly featuring a washer with radially varying circumferential ramps and a ring with axial protrusions that engage via a friction-fit connection, eliminating the need for snap-fitting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If snap-fitting parts with locking tabs are used to connect washer and ring, then connection strength is improved, but manufacturing precision requirements increase due to need for precise alignment of tabs and slots
Solution Approach 1:
The invention changes the connection mechanism from rigid snap-fitting tabs to a friction-fit system using inclined ramps. The ramps have specific angle parameters that allow progressive engagement, transforming the connection from requiring precise positional alignment to relying on controlled friction and mechanical interlocking through the ramp geometry
Solution Approach 2:
The invention uses inclined ramp surfaces with curved or angled geometries instead of flat tab-slot interfaces. The ramp structure creates a progressive engagement path that guides the protrusions onto the ramps, allowing self-alignment and reducing the need for precise pre-alignment during assembly
2Reliability
If snap-fitting parts are used for assembly, then connection reliability is improved, but device complexity increases due to multiple interlocking components
Solution Approach 1:
The invention merges the connection function into the basic structural elements of the washer and ring themselves. The ramps are formed as integral features of the washer, and the protrusions are integral to the ring, eliminating the need for separate locking tabs and slots as distinct components
3Strength
If precise alignment of snap-fitting parts is required, then connection strength is maintained, but productivity decreases due to slower assembly process
Solution Approach 1:
The ramp geometry is pre-configured with specific inclines and angles that automatically guide the protrusions during insertion. This preliminary structural preparation allows the components to self-align and engage correctly without requiring external alignment tools or procedures, speeding up assembly while maintaining connection strength
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 friction-fit connection provides a cost-effective and efficient assembly process with improved alignment and fit, reducing the complexity and cost associated with precise alignment of snap-fitting parts.
Implementation Method 1
engages a radially outer surface of the plurality of ramps to connect the washer and the ring by a friction-fit connection
Data Source
AI summary
A thrust washer assembly including a washer and a ring is provided. The washer includes a circumferential outer surface that varies radially from an axis of the washer to define a plurality of ramps. The ring includes a plurality of axial protrusions that each includes an inner radial surface that, via a relative rotation of the washer to the ring, engages a radially outer surface of the plurality of ramps to connect the washer and the ring by a friction-fit connection.