Hitachi, Ltd.

Ran Ito

Seikichi Tanno

Takao Uematsu

Tomio Yoshida

Jun Matsubayashi

Yoshiharu Honma

A friction material made of a molded cork, a friction surface of which is covered with a liquid or semi-solid lubricant layer including a solid lubricant layer comprising a solid lubricant having a larger particle size and a solid lubricant having a smaller particle size and filling vacant spaces between the larger-sized solid lubricant in dense form, affords a long service life when used in a power controlling apparatus which can transmit power and/or change rotation speed by applying friction and using a friction material.

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Hitachi, Japan

Ran Ito