Dry friction material and method for manufacturing the same

A dry friction material shaped into a flat ring containing glass fibers, a synthetic resin for glass fiber impregnation, and a compounded rubber,

• wherein the glass fibers are impregnated with the synthetic resin to form resin-impregnated glass fibers, and the compounded rubber adheres to the resin-impregnated glass fibers,
• wherein the dry friction material comprises a plurality of fixed parts at which the dry friction material is fixed to a core material, and a plurality of non-fixed parts disposed at an area which does not include the fixed part, the non-fixed part being a recessed part of the dry friction material that is formed between the fixed parts and that is not fixed to the core material when the dry friction material is fixed to the core material through the fixed parts,
• wherein the fixed part and the non-fixed part are disposed side by side in a circumferential direction of the dry friction material,
• wherein the fixed part has a content rate of the compounded rubber higher than the non-fixed part, while having a content rate of the glass fibers lower than the non-fixed part, and wherein the dry friction material has a friction surface at one side in a thickness direction thereof and a contact surface at another side in the thickness direction, the dry friction material has the contact surface disposed at the fixed part, while having the recessed part as the non-fixed part disposed on the contact surface so as to be opposite to the friction surface of the dry friction material so that the recessed part as the non-fixed part is disposed between the fixed parts at a side of the contact surface, and the contact surface contacts with the core material when the dry friction material is fixed to the core material through the fixed parts, while the recessed part as the non-fixed part forms a hollow space between the dry friction material and the core material when the dry friction material is fixed to the core material through the fixed parts.