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research-article

INFLUENCE OF THE POSITION OF OIL DRAIN HOLES OF A PISTON ON LUBRICATING OIL CONSUMPTION

[+] Author and Article Information
Hiroki Hasegawa

Department of Mechanical Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan
hhasegawa0928@icloud.com

Koji Kikuhara

Graduate School of Environment and Engineering, Waseda University, 1011 Nishitomita, Honjyo-shi, Saitama 367-0035
kj.kikuhara@gmail.com

Akemi Ito

Department of Mechanical Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan
aito@tcu.ac.jp

Shunsuke Nishijima

Department of Mechanical Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan
shun666shun@gmail.com

Masatsugu Inui

Nissan Motor Co., Ltd., 560-2 okatsukoku, atsugi-shi, kanagawa 243-0192
i-masa@mail.nissan.co.jp

Hirotaka Akamatsu

Nissan Motor Co., Ltd., 560-2 okatsukoku, atsugi-shi, kanagawa 243-0192
hirotaka-akamatsu@mail.nissan.co.jp

1Corresponding author.

ASME doi:10.1115/1.4040746 History: Received February 26, 2018; Revised March 01, 2018

Abstract

An increase in lubricating oil consumption in a gasoline engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst of after treatment devices, abnormal combustion in a turbo-changed gasoline engine and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore reducing oil consumption is required strongly. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes hence the oil pressure were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front / rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front / rear end of the piston skirt were effective for reducing oil consumption.

Copyright (c) 2018 by ASME
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