Cam Follower Roller Device Angular Misalignment
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Solution Overview
Problem
Cam follower roller devices in automotive and industrial applications experience edge stresses due to angular misalignment between the tappet body and housing axes, leading to increased pressure contact with the cam, which can cause wear and inefficiency.
Innovation Solution
Incorporating deformable rings between the pin ends and the tappet body, providing a flexible connection that allows the pin to tilt and accommodate angular misalignment, thereby reducing edge stresses on the roller and minimizing pressure contact with the cam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection is used between the pin and tappet body, then the structure is simple and strong, but edge stresses occur at the roller ends due to angular misalignment
Solution Approach 1:
The patent employs deformable rings as flexible elements positioned between the pin ends and the tappet body. These rings can deform elastically to accommodate angular misalignment between the tappet body axis and housing axis, preventing rigid stress concentration at the roller ends while maintaining structural integrity.
Solution Approach 2:
The patent changes the rigidity parameter of the connection between pin and tappet body by introducing deformable rings. This allows the connection to transition from rigid to flexible, enabling angular adjustment to eliminate edge stresses on the roller while maintaining sufficient structural strength.
2Ease of manufacture
If the pin is fixed rigidly to the tappet body, then manufacturing is simple, but angular misalignment increases pressure contact between roller and cam
Solution Approach 1:
The deformable rings serve as flexible intermediaries that allow angular adjustment of the pin relative to the tappet body. This flexibility accommodates misalignment without increasing manufacturing complexity significantly, as the rings can be installed in the existing hole structure.
Solution Approach 2:
The deformable rings act as intermediary elements between the pin and tappet body, providing a compliant connection that absorbs angular misalignment. This mediator allows the pin to tilt slightly, reducing pressure contact between the roller and cam while maintaining a relatively simple manufacturing process.
3Object-affected harmful factors
If deformable rings are introduced to allow pin tilting, then edge stresses are reduced, but device complexity increases
Solution Approach 1:
The deformable rings provide a relatively simple flexible connection solution. Each ring is a single component that can be pressed into place between the pin end and tappet body, adding minimal structural complexity while effectively reducing edge stresses through elastic deformation.
Solution Approach 2:
The introduction of deformable rings changes the mechanical parameter of the pin-tappet body connection from rigid to flexible. This parameter change enables angular adjustment to reduce edge stresses, while the simplicity of the ring geometry and installation process minimizes the increase in overall device complexity.
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 flexible connection between the pin and tappet body reduces edge stresses and pressure contact, enhancing the operational efficiency and longevity of the cam follower roller device by accommodating misalignment and distributing forces more evenly.
Implementation Method 1
one deformable ring disposed between each pin end of said pin and an inner wall of the associated hole of said tappet body
Implementation Method 2
The edge stresses that may occur at the ends of the roller with the contact against the associated cam is reduced
Data Source
Figure 1~2
AI summary
The cam follower roller device comprises a tappet body 12, a pin 14 and a roller 16 mounted on said pin, the tappet body comprising holes 12b, 12c for mounting pin ends 14b, 14c of said pin on said tappet body. The device further comprises one deformable ring 18, 20 disposed between each pin end 14b, 14c of said pin and an inner wall of the associated hole 12b, 12c of said tappet body.