Wet-type friction plate having small holes on the surface
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 29, 2000
Grant Date -
N/A
app pub date -
May 28, 1998
filing date -
May 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully