Cam Follower Roller With Peripheral Openings for High Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mechanical cam follower roller devices fail to meet the increased demands of higher fuel pump pressure and oil-free operation requirements, leading to reduced service life due to high contact pressure and lack of lubrication.
Innovation Solution
The cam follower roller device features a casing with peripheral openings allowing a larger diameter and length roller, reducing contact pressure and enhancing service life, along with an antifriction and wear-resistant coating and a bushing for improved performance, while maintaining standard dimensions and potentially using lubricating oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the roller diameter and axial length are increased to reduce contact pressure, then the service life is improved, but the casing dimensions would need to be enlarged
Solution Approach 1:
The casing is divided into a body portion and a removable cover portion that can be separated. The cover is removed to insert a larger roller through openings in the casing body, then the cover is reattached. This segmentation allows roller replacement without enlarging the overall casing volume.
Solution Approach 2:
Openings are pre-formed in the casing body at strategic locations to accommodate the larger roller dimensions. These openings are prepared in advance during manufacturing, enabling the insertion of oversized rollers without requiring post-manufacturing modification or increasing the casing envelope.
2Area of moving object
If the roller diameter is increased to reduce contact pressure, then the contact surface area is improved, but the device complexity increases
Solution Approach 1:
The casing is segmented into a stationary body and a removable cover. This allows the roller to be accessed and replaced through simple opening/removal actions rather than requiring complex disassembly procedures, maintaining device simplicity despite accommodating larger rollers.
3Ease of operation
If openings are added to the casing to accommodate larger rollers, then the roller insertion is improved, but the casing structural integrity may be compromised
Solution Approach 1:
The casing is divided into a body and a cover that can be independently removed. The openings are formed only in the cover portion, which is then completely removed to provide unobstructed access for roller insertion. This maintains the structural integrity of the main casing body while enabling easy roller replacement.
Solution Approach 2:
The removable cover acts as an intermediary element that provides the opening pathway for roller insertion. The cover is specifically designed with openings and can be detached, serving as a mediator between the external environment and the internal roller, without compromising the main casing structure.
Data Source
AI summary
A cam follower roller device, notably for fuel injection pump of an internal combustion engine, the cam follower roller device comprising a casing, a shaft mounted on the casing and a roller rotatably mounted on the shaft. The casing comprises on its periphery at least four openings made through the thickness of the casing and located in such a way that two openings face one end of the outer cylindrical surface of the roller.