A balancing cam mechanism for minimizing the torque fluctuation of engine camshafts

Deng Ying Lin, Bo Jiun Hou, Chao-Chieh Lan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This paper presents the design and experiment of a balancing cam mechanism to minimize the torque fluctuation of engine camshafts. Torque fluctuation of rotary machines causes unwanted vibration that would impair their performance and reliability. The combination of inertia, driving, and resistive torque fluctuations on engine crankshafts and camshafts is the major source of vehicle vibration. For camshafts, the magnitude of resistive torque fluctuation is more substantial than that of inertia torque fluctuation at low to medium speeds. While previous methods focused on suppressing or isolating vibration motion from engine to chassis, the proposed method seeks to directly reduce the torque fluctuation on engine shafts. The balancing mechanism consists of a cam, rocker, and spring. Given a resistive torque curve of a camshaft, the cam profile can be synthesized such that the output balancing torque cancels with the original resistive camshaft torque. Thus the camshaft will statically generate zero output torque. Based on a derived camshaft torque model, a design process of the cam profile is presented. The effect of inertia torque at various speeds is compared with the balancing torque. Finally, a prototype and its associated experiments are presented to demonstrate the torque balancing performance.

Original languageEnglish
Pages (from-to)160-175
Number of pages16
JournalMechanism and Machine Theory
Volume108
DOIs
Publication statusPublished - 2017 Feb 1

Fingerprint

Camshafts
Cams
Torque
Engines
Crankshafts
Chassis

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications

Cite this

@article{bd705e778a4f4266b1950d0718c08236,
title = "A balancing cam mechanism for minimizing the torque fluctuation of engine camshafts",
abstract = "This paper presents the design and experiment of a balancing cam mechanism to minimize the torque fluctuation of engine camshafts. Torque fluctuation of rotary machines causes unwanted vibration that would impair their performance and reliability. The combination of inertia, driving, and resistive torque fluctuations on engine crankshafts and camshafts is the major source of vehicle vibration. For camshafts, the magnitude of resistive torque fluctuation is more substantial than that of inertia torque fluctuation at low to medium speeds. While previous methods focused on suppressing or isolating vibration motion from engine to chassis, the proposed method seeks to directly reduce the torque fluctuation on engine shafts. The balancing mechanism consists of a cam, rocker, and spring. Given a resistive torque curve of a camshaft, the cam profile can be synthesized such that the output balancing torque cancels with the original resistive camshaft torque. Thus the camshaft will statically generate zero output torque. Based on a derived camshaft torque model, a design process of the cam profile is presented. The effect of inertia torque at various speeds is compared with the balancing torque. Finally, a prototype and its associated experiments are presented to demonstrate the torque balancing performance.",
author = "Lin, {Deng Ying} and Hou, {Bo Jiun} and Chao-Chieh Lan",
year = "2017",
month = "2",
day = "1",
doi = "10.1016/j.mechmachtheory.2016.10.023",
language = "English",
volume = "108",
pages = "160--175",
journal = "Mechanism and Machine Theory",
issn = "0374-1052",
publisher = "Elsevier Limited",

}

A balancing cam mechanism for minimizing the torque fluctuation of engine camshafts. / Lin, Deng Ying; Hou, Bo Jiun; Lan, Chao-Chieh.

In: Mechanism and Machine Theory, Vol. 108, 01.02.2017, p. 160-175.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A balancing cam mechanism for minimizing the torque fluctuation of engine camshafts

AU - Lin, Deng Ying

AU - Hou, Bo Jiun

AU - Lan, Chao-Chieh

PY - 2017/2/1

Y1 - 2017/2/1

N2 - This paper presents the design and experiment of a balancing cam mechanism to minimize the torque fluctuation of engine camshafts. Torque fluctuation of rotary machines causes unwanted vibration that would impair their performance and reliability. The combination of inertia, driving, and resistive torque fluctuations on engine crankshafts and camshafts is the major source of vehicle vibration. For camshafts, the magnitude of resistive torque fluctuation is more substantial than that of inertia torque fluctuation at low to medium speeds. While previous methods focused on suppressing or isolating vibration motion from engine to chassis, the proposed method seeks to directly reduce the torque fluctuation on engine shafts. The balancing mechanism consists of a cam, rocker, and spring. Given a resistive torque curve of a camshaft, the cam profile can be synthesized such that the output balancing torque cancels with the original resistive camshaft torque. Thus the camshaft will statically generate zero output torque. Based on a derived camshaft torque model, a design process of the cam profile is presented. The effect of inertia torque at various speeds is compared with the balancing torque. Finally, a prototype and its associated experiments are presented to demonstrate the torque balancing performance.

AB - This paper presents the design and experiment of a balancing cam mechanism to minimize the torque fluctuation of engine camshafts. Torque fluctuation of rotary machines causes unwanted vibration that would impair their performance and reliability. The combination of inertia, driving, and resistive torque fluctuations on engine crankshafts and camshafts is the major source of vehicle vibration. For camshafts, the magnitude of resistive torque fluctuation is more substantial than that of inertia torque fluctuation at low to medium speeds. While previous methods focused on suppressing or isolating vibration motion from engine to chassis, the proposed method seeks to directly reduce the torque fluctuation on engine shafts. The balancing mechanism consists of a cam, rocker, and spring. Given a resistive torque curve of a camshaft, the cam profile can be synthesized such that the output balancing torque cancels with the original resistive camshaft torque. Thus the camshaft will statically generate zero output torque. Based on a derived camshaft torque model, a design process of the cam profile is presented. The effect of inertia torque at various speeds is compared with the balancing torque. Finally, a prototype and its associated experiments are presented to demonstrate the torque balancing performance.

UR - http://www.scopus.com/inward/record.url?scp=85006857947&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006857947&partnerID=8YFLogxK

U2 - 10.1016/j.mechmachtheory.2016.10.023

DO - 10.1016/j.mechmachtheory.2016.10.023

M3 - Article

AN - SCOPUS:85006857947

VL - 108

SP - 160

EP - 175

JO - Mechanism and Machine Theory

JF - Mechanism and Machine Theory

SN - 0374-1052

ER -