Modeling of a finger-follower CAM system with verification in contact forces

Wen-Syang Hsu*, Albert P. Pisano

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

A lumped/distributed-parameter, dynamic model is developed to investigate the dynamic responses of a finger follower valve train with the effects of an oscillating pivot, frictional forces between sliding surfaces, and a hydraulic lash adjuster. Based on the measured force data at low speed, an algorithm is derived to determine the dynamic Coulomb friction coefficients around maximum valve lift simultaneously at three contact points. A constraint equation is formulated to find the contact position between the cam and the follower kinematically. This makes it possible for the model to simulate the dynamic response of the cam system when the pivot is moving. A hydraulic lash adjuster acting as the pivot of the follower is also modeled with the effects of oil compressibility and oil-refill mechanism. The model is numerically integrated and shown to have good agreement between simulation results and experimental data of contact forces at three different speeds. The maximum operating speed is limited by valve toss, loss contact between components. The model predicts toss between the hydraulic lash adjuster and the follower at 2535 rpm, and experiment indicates toss starting at 2520 rpm of camshaft speed.

Original languageEnglish
Title of host publicationVibration and Dynamics of Robotic and Multibody Structures:
PublisherPubl by ASME
Pages29-38
Number of pages10
ISBN (Print)0791811743
StatePublished - 1 Dec 1993
EventProceedings of the 14th Biennial ASME Design Technical Conference on Mechanical Vibration and Noise - Albuquerque, NM, USA
Duration: 19 Sep 199322 Sep 1993

Publication series

NameAmerican Society of Mechanical Engineers, Design Engineering Division (Publication) DE
Volume57

Conference

ConferenceProceedings of the 14th Biennial ASME Design Technical Conference on Mechanical Vibration and Noise
CityAlbuquerque, NM, USA
Period19/09/9322/09/93

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