The Variable Rocker-Arm Mechanism

2005 ◽  
Author(s):  
Madhusudan Raghavan
Keyword(s):  
Dynamic Analysis ◽  
Rolling Contact ◽  
Valve Lift ◽  
Simple Construction ◽  
Low Friction ◽  
Frictional Losses ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve

We present an investigation of a novel variable valve-lift mechanism known as the Variable Rocker-Arm mechanism (VR-Arm, for short). This mechanism has simple construction, low friction due to rolling contact, and provides continuously variable lift. Dynamic analysis of the mechanism using ADAMS shows that frictional losses at the intake camshaft are of the order of 1 Newton-meter for a four-cylinder engine.

Variable Valve Actuation for Advanced Powertrains

2008 ◽  
Author(s):  
Burak Gecim ◽  
Madhusudan Raghavan
Keyword(s):  
Valve Lift ◽  
Test Results ◽  
Variable Valve Actuation ◽  
Lift Mechanism ◽  
Comprehensive Survey ◽  
Variable Valve Lift ◽  
Direct Acting ◽  
Variable Valve ◽  
Considerable Detail ◽  
Valve Actuation

We review variable valve actuation (VVA) concepts and also present the results of our work in the creative synthesis of these devices. We begin with a comprehensive survey of existing VVA devices. We then describe our work on four VVA concepts which we have explored in considerable detail. These include hydraulic lost-motion variable-lift systems, in both the direct acting and the roller-finger-follower configurations, several valve deactivation mechanisms with unique features, a variable valve-lift mechanism, and a variable-lift and duration concept. These devices differ in their complexity and versatility but offer a spectrum of design solutions applicable to a range of products. The strengths and weaknesses of these different approaches are discussed and analyzed, and some test results are presented.

Development of Continuously Variable Valve Lift Mechanism for Improved Fuel Economy

2012 ◽  
Author(s):  
Hermes Fernandez ◽  
Youssef Kazour ◽  
Michael Knauf ◽  
James Sinnamon ◽  
Edward Suh ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Valve Lift ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve

Variable Valve Actuation Mechanism Using Magnetorheological Fluid

2005 ◽  
Author(s):  
H. Hirani ◽  
S. Dani
Keyword(s):  
Valve Lift ◽  
Frictional Torque ◽  
Valve Mechanism ◽  
Actuation Mechanism ◽  
Variable Valve Actuation ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Direct Acting ◽  
Variable Valve ◽  
And Control

A magnetorheological (MR) fluid based variable valve lift mechanism is presented. A test setup is designed to measure the frictional-torque and valve-displacement of a direct acting valve mechanism under various speed conditions. Results of valve lifts at different speeds and control currents are presented.

Development of a Custom Integrated Circuit for Continuously Variable Valve Lift Mechanism System Control

2008 ◽  
Author(s):  
Kazuya Kinoshita ◽  
Kazuhiko Ueda ◽  
Fumihiko Ito ◽  
Yasushi Shinojima ◽  
Takashi Yanagizawa ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Valve Lift ◽  
System Control ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve

Design evaluation of a follower cam with variable valve lift mechanism

2013 ◽  
Vol 4 (1) ◽  
pp. 7-22 ◽  
Author(s):  
G. Dritsas ◽  
P.G. Nikolakopoulos ◽  
C.A. Papadopoulos
Keyword(s):  
Valve Lift ◽  
Design Evaluation ◽  
Lift Mechanism ◽  
Variable Valve Lift ◽  
Variable Valve
Sign in / Sign up

Export Citation Format

Share Document