Gear Device Pin Retention via Tapered Hole and Restriction Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gear devices face the challenge of preventing insertion pin slippage during rotation without complicating the assembly process, as they often require complex configurations such as tapered holes and bolts to secure the pin in place.
Innovation Solution
A gear device design featuring a carrier with a first and second member, where the insertion pin is housed in a first hole that extends through the first member and a second hole in the second member, with at least one of these holes having a shape that restricts movement in the rotation axis direction, and a restriction member mounted in the first member to prevent pin movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through hole and female screw portion are added to prevent insertion pin slippage, then the insertion pin can be securely restrained, but the assembly process becomes more complex
Solution Approach 1:
The invention extracts the pin retention function from a complex multi-component system (through hole, female screw, bolt) and implements it through a single integrated protrusion structure on the insertion pin itself. This protrusion directly engages with the tapered hole to prevent slippage, eliminating the need for separate retention components and simplifying the assembly process while maintaining reliability
Solution Approach 2:
The invention merges the positioning function and the retention function into a single integrated structure. The protrusion on the insertion pin simultaneously provides positioning within the tapered hole and prevents slippage during rotation, combining multiple functions that were previously separated into different components
2Manufacturing precision
If tapered holes are used for positioning, then the insertion pin can be positioned accurately, but the pin may slip out during rotation
Solution Approach 1:
The invention applies preliminary action by designing the protrusion to engage with the tapered hole in advance, creating a pre-established mechanical interlock before rotation occurs. This engagement prevents slippage during operation without requiring additional retention mechanisms
Solution Approach 2:
The invention utilizes the tapered (conical) geometry of the hole and corresponding protrusion to create a self-retaining mechanism. The curved/tapered surface provides both precise positioning and friction-based retention, preventing the pin from slipping out during rotation while maintaining manufacturing precision
Data Source
AI summary
A gear device is provided with a carrier having a first member and a second member opposed to the first member in a rotation axis direction, a crankshaft configured to cause the carrier to rotate relative to an outer cylinder about a rotation axis, an insertion pin inserted into the first member and the second member, and a restriction member configured to restrict movement of the insertion pin. The insertion pin is housed in such a manner as to extend from a first hole over to a second hole, the first hole formed in the first member so as to extend through the first member, the second hole formed in the second member so as to correspond to the first hole. At least one of the first hole and the second hole has such a shape as to restrict movement of the insertion pin toward the second hole in the rotation axis direction. The restriction member is mounted in the first member so as to restrict movement of the insertion pin toward the first hole in the rotation axis direction.