Planetary Roller Speed Changer Pin Connection
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Solution Overview
Problem
The existing planetary roller speed changers face issues with complex assembly and high manufacturing costs due to the need for precise flattening of shaft ends and the use of balls to prevent direct contact between input and output shafts, leading to potential wear and irregular rotation.
Innovation Solution
A planetary roller speed changer design that incorporates a connection pin inserted into concentric holes in the output and input shafts, preventing direct contact and reducing friction, allowing for simpler assembly and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball is interposed between the input shaft and output shaft to prevent direct contact, then wear and irregular rotation are reduced, but the assembly complexity and manufacturing cost increase due to the need for precise flattening of shaft ends
Solution Approach 1:
A connection pin is introduced as an intermediary element between the input shaft and output shaft. The pin fits into concentric holes in both shafts and prevents direct contact between them, eliminating the need for ball intermediaries and complex surface flattening operations. This simplifies the device while maintaining the function of preventing irregular rotation and wear.
Solution Approach 2:
The ball intermediary and the requirement for flattened shaft surfaces are extracted/removed from the system. Instead, a simple connection pin inserted through concentric holes is used, which can be manufactured and assembled more easily without requiring precise surface flattening of the shaft ends.
2Object-generated harmful factors
If the shaft end surfaces are flattened to accommodate a ball, then the ball and shaft are in point contact reducing sliding friction, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The requirement for flattened shaft surfaces is extracted/removed from the manufacturing process. The connection pin design allows the use of simple cylindrical holes in the shafts without requiring any surface flattening operations, significantly simplifying manufacturing while still preventing sliding friction through the pin connection.
3Ease of manufacture
If the connection pin is inserted into concentric holes in both shafts, then assembly is simplified and manufacturing cost is reduced, but direct contact between shafts must be prevented to avoid wear
Solution Approach 1:
The connection pin serves as the intermediary element that simultaneously achieves both goals: it simplifies assembly by being inserted through pre-drilled concentric holes without requiring surface flattening, and it prevents direct contact between the input and output shafts, thereby eliminating wear and maintaining 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
The design enables axial placement of output and input shafts with reduced assembly time and manufacturing costs, while minimizing irregular rotation and wear by using a connection pin to manage skew and reduce friction.
Implementation Method 1
When the output shaft and the input shaft axially approach each other, the connection pin interposed between the output shaft and the input shaft allows the output shaft and the input shaft to avoid coming into contact with each other
Implementation Method 2
The planetary rollers 16 are in rolling contact with the stationary ring 12 and the input shaft 14
Implementation Method 3
the ball 72 and the output shaft 20 to be in point contact with each other, thus reducing sliding friction at the contact portion
Data Source
AI summary
An axial end of an output shaft facing toward an input shaft has a first hole that is concentric with the output shaft and that axially extends to a predetermined depth. An axial end of the input shaft facing toward the output shaft has a second hole that is concentric with the input shaft and that axially extends to a predetermined depth. A connection pin is inserted in the first hole and the second hole to connect the first hole and the second hole. When the output shaft and the input shaft axially approach each other, the connection pin interposed between the output shaft and the input shaft allows the output shaft and the input shaft to avoid coming into contact with each other.