Roller Lifter Radial Stopper Formation
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Solution Overview
Problem
The existing roller lifter manufacturing process is complicated and costly due to the axial insertion of a punch to form the rotation stopper, which increases manufacturing costs and reduces productivity.
Innovation Solution
A roller lifter design where the rotation stopper is formed by radially moving a punch member through an opening in the peripheral wall, eliminating the need for complex mold construction and allowing for efficient formation of the stopper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a punch is axially inserted inside the peripheral wall and turned to a radial direction to form the rotation stopper, then the rotation stopper can be formed, but the mold construction becomes complicated and manufacturing costs increase
Solution Approach 1:
Instead of inserting the punch axially from the end of the peripheral wall and turning it radially, the invention inverts the approach by inserting the punch radially from the outer periphery of the peripheral wall directly to the inner periphery. This inversion simplifies the mold construction by eliminating the need for complex axial insertion mechanisms and turning mechanisms, thereby reducing manufacturing costs while still achieving the desired rotation stopper formation.
2Productivity
If a punch is axially inserted and turned to form the rotation stopper, then the rotation stopper can be formed, but the manufacturing process becomes time-consuming and productivity decreases
Solution Approach 1:
The invention inverts the traditional forming approach by moving from axial insertion with radial turning to direct radial insertion. This inversion eliminates the time-consuming turning operation, allowing the rotation stopper to be formed in a single straightforward punching motion, thereby significantly improving manufacturing efficiency and productivity.
Solution Approach 2:
The invention extracts the unnecessary axial insertion and turning steps from the forming process, retaining only the essential radial punching action. By removing these redundant operations, the manufacturing process becomes more efficient and productive without compromising the quality of the rotation stopper formation.
3Ease of manufacture
If the rotation stopper is formed by axial insertion and turning, then the stopper can be created, but the process requires complicated mold construction increasing manufacturing costs
Solution Approach 1:
The invention applies inversion by completely reversing the traditional forming sequence. Instead of axial insertion followed by radial turning (complex), it uses direct radial insertion (simple). This fundamental inversion dramatically simplifies mold construction, reduces manufacturing costs, and maintains the functional integrity of the rotation stopper.
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 approach reduces manufacturing costs and improves productivity by simplifying the formation of the rotation stopper, ensuring smooth operation and reducing axial runout of the roller lifter.
Implementation Method 1
a rotation stopper forming punch member which is radially movable is moved inside the peripheral wall through the opening thereby to press a part of the peripheral wall outward
Data Source
AI summary
A roller lifter includes a lifter body having a cylindrical peripheral wall and a roller rotatably mounted on the lifter body via a shaft member and brought into contact with a cam. The peripheral wall has an outer periphery formed with a sliding surface which is slid on an inner wall of a cylinder. The lifter body has a rotation stopper formed by outwardly protruding a part of the peripheral wall, and an opening formed in another part of the peripheral wall which another part is radially opposed to the rotation stopper. The opening is open so that the rotation stopper oppositely faces the opening.