A Newly Developed Variable Valving Mechanism with Low-Mechanical Friction

Paper #:
  • 920451

Published:
  • 1992-02-01
Citation:
Shibano, K., Kamimaru, S., Yamada, T., and Watanabe, K., "A Newly Developed Variable Valving Mechanism with Low-Mechanical Friction," SAE Technical Paper 920451, 1992, https://doi.org/10.4271/920451.
Pages:
9
Abstract:
Since the intake and exhaust valve timings that provide the best fuel economy, idle stability, or highest power change according to the engine operating zone, a variable valve timing system is very beneficial.Also, roller followers, which reduce mechanical friction loss of a valve train mainly at low engine speed, are commonly used to improve fuel economy in urban driving conditions. This paper presents a newly developed 4-valve variable-valve-timing mechanism with roller followers.Different intake- and exhaust-valve timings and lifts are selected independently, depending upon whether engine speed is low or high.Durability tests of running at maximum engine speed and switching between low- and high-speed cams were conducted and good test results were obtained.
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