Transmission Retention Ring Dual-Feature Design
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Solution Overview
Problem
In motor vehicle transmission assemblies, the use of multiple snap rings is often required to retain components axially and prevent centrifugal forces from dislodging external snap rings, increasing complexity and part count.
Innovation Solution
A retention ring with both outwardly and inwardly extending retention features that engages a backing plate or external gear and the external snap ring, respectively, allowing for the retention of components with only two snap rings, eliminating the need for a third snap ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple snap rings are used to retain components axially and prevent centrifugal forces from dislodging external snap rings, then component retention reliability is improved, but device complexity and part count increase
Solution Approach 1:
The retention ring combines multiple functions into a single component: it provides axial retention through outwardly extending retention features that engage the backing plate, and it prevents centrifugal dislodging of the external snap ring through inwardly extending retention features that engage the external snap ring. This merging of functions eliminates the need for separate snap rings, reducing part count from three to two while maintaining retention reliability.
Solution Approach 2:
The retention ring serves multiple purposes simultaneously: it acts as an axial retainer for the backing plate, a centrifugal force counteract for the external snap ring, and a structural support element. By designing a single component that performs all these functions, the patent achieves multi-functionality that resolves the contradiction between reliability and complexity.
2Reliability
If multiple snap rings are used to retain components axially and prevent centrifugal forces from dislodging external snap rings, then component retention reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The retention ring is manufactured as a single integrated component with both outwardly and inwardly extending retention features formed simultaneously. This eliminates the need to manufacture and assemble multiple separate snap rings, reducing manufacturing steps, tooling requirements, and quality control complexity while maintaining the reliability benefits of multiple retention mechanisms.
3Reliability
If multiple snap rings are used to retain components axially and prevent centrifugal forces from dislodging external snap rings, then component retention reliability is improved, but assembly time increases
Solution Approach 1:
The retention ring is installed as a single component that simultaneously provides both axial retention and centrifugal force resistance. This eliminates the need to install and position multiple separate snap rings, reducing assembly time and the risk of assembly errors while maintaining the dual retention functions that ensure reliability.
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 configuration reduces part count, simplifies assembly, and enhances system balance while maintaining component retention under high RPM conditions, without the need for additional axial load-bearing components.
Implementation Method 1
The members may be deflected or flexed to facilitate insertion into a mating groove. Snap rings are constructed to direct a retaining or clamping force along the circumference or periphery of the snap ring when properly inserted onto a component.
Data Source
AI summary
A retention ring is configured to retain components within a transmission assembly. The retention ring has an annular main body defining an opening through a center thereof. The annular main body defines an outer curved surface and an inner curved surface, the annular main body having a distal face disposed in a distal plane and a proximal face disposed in a proximal plane. A first set of retention features extend from the inner curved surface, and a second set of retention features from the outer curved surface. One of the sets of retention features is configured to engage a backing plate or an outer member, and at least one of the sets of retention features is entirely disposed between the proximal plane and the distal plane. A transmission assembly includes the retention ring and an adjacent external snap ring.