Semi-Cylindrical Cam Follower Assembly Without Caulking
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Solution Overview
Problem
The existing cam follower systems, particularly in injection pumps and valve actuators, require costly and time-consuming caulking operations for assembly, and involve complex machining processes, leading to high production costs.
Innovation Solution
A mechanical system comprising a support element with two semi-cylindrical parts and a holding system that allows for easy assembly of a pin and roller without caulking, using assembling pins and holding rings to maintain the parts together, eliminating the need for additional circlips and reducing machining requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tappet body is made as a single piece with flanges and holes for pin support, then the structural integrity is improved, but the manufacturing complexity and cost increase due to machining requirements
Solution Approach 1:
The tappet body is divided into two separate semi-cylindrical parts instead of being manufactured as a single piece. This segmentation allows each part to be manufactured more easily without complex machining operations, while the parts are subsequently assembled together to form the complete support structure, resolving the contradiction between structural integrity and manufacturing ease.
2Strength
If the pin ends are caulked to create a mechanical connection, then the connection strength is improved, but the assembly time and production cost increase
Solution Approach 1:
The two semi-cylindrical parts are designed with features that allow the pin to be retained through preliminary assembly actions rather than requiring time-consuming caulking operations. The parts are assembled around the pin in a predetermined sequence that secures the connection before final assembly, eliminating the need for costly and time-consuming caulking while maintaining connection strength.
3Reliability
If the tappet body is machined to form lubricating grooves, then the lubrication performance is improved, but the manufacturing time and cost increase
Solution Approach 1:
The lubricating grooves are formed on the external surfaces of the two separate semi-cylindrical parts during their individual manufacturing processes, rather than requiring complex machining of a single integrated body. This segmentation allows for simpler, faster manufacturing of each part while maintaining the necessary lubrication features, thereby improving productivity without sacrificing lubrication performance.
Data Source
AI summary
A mechanical system forms a cam follower or a rocker arm. The mechanical system comprises: a support element, a pin extending between two opposite ends along a first axis and supported by the support element, and a roller adapted to receive the pin. The roller being mounted on pin, movable in rotation relative to the pin around the first axis and adapted to roll on a cam. The support element comprises two separate parts, generally semi-cylindrical, each having a contact face, in contact with one other, and a holding feature for maintaining parts assembled together.