Friction member, friction material composition, friction material, and vehicle
AssigneeHitachi Chemical Company, Ltd.
InventorAkira KUMAZAWA
Life of this patent
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Abstract
The present invention relates to a friction member comprising a friction material and a back metal, wherein the friction material comprises no copper, or has a copper content of less than 0.5% by mass in terms of a copper element even if the friction material comprises copper, the friction material comprises magnesium oxide and a carbon material comprising graphite and coke, the carbon material is obtained by blending in a combination of a coarse-grained material and a fine-grained material, an average particle diameter of the coarse-grained material is 100 to 600 μm, and an average particle diameter of the fine-grained material is less than 100 μm.
Claims21
A friction member comprising a friction material and a back metal, wherein
- the friction material comprises no copper, or has a copper content of less than 0.5% by mass in terms of a copper element even if the friction material comprises copper,
- the friction material comprises magnesium oxide and a carbon material comprising graphite and coke,
- the carbon material is obtained by blending in a combination of a coarse-grained material and a fine-grained material,
- an average particle diameter of the coarse-grained material is 100 to 600 μm, and
- an average particle diameter of the fine-grained material is less than 100 μm.
A friction material composition comprising no copper, or having a copper content of less than 0.5% by mass in terms of a copper element even if the friction material composition comprises copper, wherein
- the friction material composition comprises magnesium oxide and a carbon material comprising graphite and coke,
- the carbon material is obtained by blending in a combination of a coarse-grained material and a fine-grained material,
- an average particle diameter of the coarse-grained material is 100 to 600 μm, and
- an average particle diameter of the fine-grained material is less than 100 μm.
A method for producing a friction material composition comprising no copper, or having a copper content of less than 0.5% by mass in terms of a copper element even if the friction material composition comprises copper, wherein
- the friction material composition comprises magnesium oxide and a carbon material comprising graphite and coke,
- the carbon material is obtained by blending in a combination of a coarse-grained material and a fine-grained material,
- an average particle diameter of the coarse-grained material is 100 to 600 μm, and
- an average particle diameter of the fine-grained material is less than 100 μm,
- the method comprising a step of mixing the magnesium oxide, graphite, and coke.
A friction material composition comprising no copper, or having a copper content of less than 0.5% by mass in terms of a copper element even if the friction material composition comprises copper, wherein
- the friction material composition comprises magnesium oxide and a carbon material comprising graphite and coke,
- the carbon material has two or more peaks in a particle diameter distribution curve showing a volume-based frequency distribution, and
- the two or more peaks comprise a first peak having a maximum in the range of 100 to 600 μm, and a second peak having a maximum in the range of less than 100 μm.
Dependencies are inferred from the claim text.