Endless belt power transmission systems or components – Pulley having circumferentially spaced portions of drive...
Reexamination Certificate
2009-11-11
2011-11-29
Kim, Sang (Department: 3654)
Endless belt power transmission systems or components
Pulley having circumferentially spaced portions of drive...
C474S160000, C474S162000
Reexamination Certificate
active
08066601
ABSTRACT:
In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven sprocket so that the tooth pitch at the point at which the timing chain disengages from the driven sprocket is at a minimum when the rotational speed of the driving sprocket is maximum, moderating fluctuations in chain tension. A similar effect can be achieved in the case of a driving sprocket having a cyclically varying tooth pitch by arranging the driving sprocket so that its tooth pitch is maximum at the point at which it is engaged by the chain when its rotational speed is maximum.
REFERENCES:
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patent: 7691020 (2010-04-01), Sakura et al.
patent: 2007/0066430 (2007-03-01), Gajewski
patent: 2008/0009377 (2008-01-01), Sakura et al.
patent: 2008/0161144 (2008-07-01), Hirai et al.
patent: 2009/0170648 (2009-07-01), Nakano
patent: 2009/0209380 (2009-08-01), Hirai et al.
patent: 2003214504 (2003-07-01), None
Kunimatsu Kohei
Nakano Yoshikazu
Sakura Shunji
Howson & Howson LLP
Kim Sang
Tsubakimoto Chain Co.
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