Planetary Gear Carrier Flange for Dropout Prevention
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Solution Overview
Problem
The existing power transmission devices with planetary gear sets face the issue of carrier falling due to lack of adequate support, leading to potential damage and assembly challenges.
Innovation Solution
A power transmission device design that includes a cylindrical member with a protruding flange portion on the carrier, positioned between the ring gear and the bottom wall of the clutch drum, prevents the carrier from falling by engaging with the ring gear, ensuring secure assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the carrier is designed without a protruding portion, then the structure is simpler, but the carrier may fall during assembly and operation
Solution Approach 1:
The carrier is extended in the radial direction by adding a protruding portion that reaches between the ring gear and the cylindrical member wall. This dimensional extension prevents the carrier from falling axially while maintaining structural simplicity, resolving the contradiction between device complexity and reliability.
2Reliability
If the carrier includes a protruding portion between the wall portion and ring gear, then the carrier falling is prevented, but the device complexity increases
Solution Approach 1:
The carrier is segmented into a main body and a protruding portion. This segmentation allows the protruding portion to serve as a dedicated retention feature without complicating the overall carrier design, as it is an integrated extension rather than a separate component.
Solution Approach 2:
The protruding portion extends the carrier radially outward to engage with the space between the ring gear and cylindrical member wall. This radial extension provides retention functionality with minimal structural modification, balancing reliability improvement with device simplicity.
3Ease of manufacture
If no retention structure is provided, then the assembly process is easier, but the carrier may drop during assembly
Solution Approach 1:
The carrier's own protruding portion serves as the retention mechanism, eliminating the need for separate retention components or complex assembly procedures. The carrier structure itself provides the retention function, simplifying both manufacturing and assembly while ensuring reliability.
Data Source
AI summary
A power transmission device includes: a cylindrical member including an opening formed at a first end in an axial direction, and a wall portion formed at a second end in the axial direction; and a planetary gear set received within the cylindrical member; a carrier of the planetary gear set which includes a protruding portion protruding toward an outer circumference side, and the protruding portion being positioned between the wall portion and a ring gear of the planetary gear set, wherein the carrier is integrally formed with a hub portion of a clutch; the hub portion is positioned on a wall portion side of the carrier; and an outermost circumference portion of the protruding portion is positioned radially outside of an outermost circumference portion of the hub portion.