Influence of the structure of polysulphide additives on the shiftability of manual transmissions
作者:
Shinichi Shirahama,
Tetsuo Ohkawa,
期刊:
Lubrication Science
(WILEY Available online 2003)
卷期:
Volume 15,
issue 2
页码: 133-145
ISSN:0954-0075
年代: 2003
DOI:10.1002/ls.3010150204
出版商: John Wiley&Sons, Ltd
关键词: shiftability;polysulphide;manual transmission;additive
数据来源: WILEY
摘要:
AbstractThe shiftability of manual transmissions is known to be strongly affected by the nature of the transmission oil. When conventional sulphur—phosphorus (SP) additives are used in the oil, gear clashing, sticking, and other problems occur. As reported previously, these problems are caused mainly by the polysulphide used in the SP additives. This paper reports on a study of the effect of the structure of the polysulphide's hydrocarbon chain on the synchromesh characteristics. It is found that polysulphides with long hydrocarbon chains have high kinematic friction coefficients and low static friction coefficients. It is also shown that this phenomenon occurs because of the adsorption of the polysulphide on to the copper alloy of which the gear synchroniser ring is made. By using a polysulphide with a long hydrocarbon chain it is possible to develop transmission oils that have superior load‐carrying capacity and better shiftability even when compared with the latest transmission oils that contain metallic deterge
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