192 clutches and power-stop control – Elements – Engaging surfaces
Patent
1998-05-28
2000-02-29
Marmor, Charles A.
192 clutches and power-stop control
Elements
Engaging surfaces
F16D 1100
Patent
active
060297913
ABSTRACT:
An advantage of the present invention is the provision of a friction material having a porous structure and a large static coefficient of friction, that is made to have a porous structure so as to improve heat resistance but which does not exhibit time-varying characteristics in friction at the beginning of engagement.
A friction material 120 is provided on the surface thereof with small holes 160 each of which is 0.02 mm.sup.2 to 0.2 mm.sup.2 in size and whose area ratio to the whole surface area of the friction material 120 is not less than 5% and whose ratio of depth to the thickness of the friction material 120 is not less than 20% and holds oil in the small holes 160.
Even if the friction material 120 is made to have a porous structure, an oil film is always formed on a friction sliding surface by the oil held in the small holes 160 to reduce a shearing force produced when an associated plate shears the oil film, thereby preventing an increase in the dynamic coefficient of friction, which can prevent a speed change shock.
REFERENCES:
patent: 3738901 (1973-06-01), Matsushima et al.
patent: 4951798 (1990-08-01), Knoess
patent: 5004089 (1991-04-01), Hara et al.
patent: 5093057 (1992-03-01), Hara et al.
Dynac Corporation
Marmor Charles A.
Waddell Tisha D.
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