Method of manufacturing a clutch facing of the type used for automotive automatic transmissions
AssigneeAisin Chemical Company, Limited
InventorsYasunobu Yamamoto, Mitsumasa Matsuo, Atsushi Nakagawa
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Abstract
A paper based frictional material is formed by forming a paper material of a desired size from a mixture comprising wood pulp, a lubricant and an organic fiber; soaking said paper material in a binder agent, and then drying the soaked material; and heating said dried paper product to carbonize the same under conditions in which oxygen is substantially eliminated from contact with said paper material so that a material is obtained whose frictional characteristics are such that the material is useful as a clutch facing in automatic transmissions.
Claims36
A method of manufacturing a paper based frictional material, comprising:
- forming a paper material of a desired size from a mixture comprising at least wood pulp;
- soaking said paper material in a binder agent, and then drying the soaked material;
- and heating said dried paper product at 120.degree.-500.degree. C. for 0.5-20 hours to carbonize a portion of said wood pulp under conditions in which oxygen is substantially eliminated from contact with said paper material by removing air over said product by reducing the atmospheric pressure, by covering a material with a liquid or by maintaining said material under inert atmosphere, so that a material is obtained whose frictional characteristics are such that the material is useful as a clutch facing in automatic transmissions.
Dependencies are inferred from the claim text.