Abstract: A sintered friction material for brake having a high friction coefficient, with which reduction of the friction coefficient is prevented at high temperature and stable brake performance is maintained. It comprises: a metal matrix of Ni or Ni+Fe (small amount); a solid lubricant (a); and a friction adjusting material (b) including: metal or alloy particles (b1) having an average particle size of 50 ?m or more and containing at least one selected from W, Mo, Cr, and FeW; and inorganic particles (b2) containing at least one selected from oxides, nitrides, carbides, and intermetallic compounds. An average particle size db1 of b1 and an average particle size db2 of b2 satisfy db1<db2. Dispersing, in the metal matrix, b1 and b2 satisfying particular conditions as the friction adjusting material can produce a geometrical structure (particle structure with a high filling density) suitable for preventing plastic deformation of the sintered friction material.

Abstract: A sintered friction material for brake having a high friction coefficient, with which reduction of the friction coefficient is prevented at high temperature and stable brake performance is maintained. It comprises: a metal matrix of Ni or Ni+Fe (small amount); a solid lubricant (a); and a friction adjusting material (b) including: metal or alloy particles (b1) having an average particle size of 50 ?m or more and containing at least one selected from W, Mo, Cr, and FeW; and inorganic particles (b2) containing at least one selected from oxides, nitrides, carbides, and intermetallic compounds. An average particle size db1 of b1 and an average particle size db2 of b2 satisfy db1<db2. Dispersing, in the metal matrix, b1 and b2 satisfying particular conditions as the friction adjusting material can produce a geometrical structure (particle structure with a high filling density) suitable for preventing plastic deformation of the sintered friction material.

Abstract: To provide a metal plate molded article with high vibration damping functionality, a noise-reduction brake disc using the same, and a manufacturing method of a metal plate molded article. A brake disc 20 is composed of a metal plate molded article including an inner member 31 composed of a metal plate and an outer member 32 composed of a metal plate and fitted onto the inner member 31, wherein a friction damping surface 30 is formed in press-contact with fitted surfaces of the inner member 31 and the outer member 32. The brake disc 20 includes a hub part 22 with a plurality of attachment holes 29 into which attachment bolts to a wheel are inserted, and an annular sliding part 21 with a sliding surface 21a with which a brake pad BP is brought into press-contact. The friction damping surface 30 is provided to surround the attachment holes 29 individually or collectively. The inner member 31 and the outer member 32 are formed inside and outside the friction damping surface 30.

Abstract: A brake disc is provided capable of effectively reducing the generation of noise such as brake noise by making specifications relating to lightening holes different from each other between two brake disc plates. In the brake disc, two brake disc plates are laminated so as to slide on each other by vibration during braking, and specifications relating to one or more selected from lightening holes, plate thickness, diameter, and warpage are made different from each other between the brake disc plates. In addition, lightening holes are formed on at least one of the brake disc plates, and one or more specifications selected from the number of lightening holes, the shapes of the lightening holes, the sizes of the lightening holes, and the arrangement positions of the lightening holes are made different from each other between the brake disc plates.

Abstract: A brake disc is provided capable of effectively reducing the generation of noise such as brake noise by making specifications relating to lightening holes different from each other between two brake disc plates. In the brake disc, two brake disc plates are laminated so as to slide on each other by vibration during braking, and specifications relating to one or more selected from lightening holes, plate thickness, diameter, and warpage are made different from each other between the brake disc plates. In addition, lightening holes are formed on at least one of the brake disc plates, and one or more specifications selected from the number of lightening holes, the shapes of the lightening holes, the sizes of the lightening holes, and the arrangement positions of the lightening holes are made different from each other between the brake disc plates.

Abstract: The present invention provides a brake disc having a corrugated outer periphery capable of effectively preventing brake judder. A brake disc having a corrugated outer periphery (1) comprising a hub disc (4) fixed to a wheel, a braking disc (3) coaxially disposed outside the hub disc (4), and a connection pin (5) connecting the hub disc (4) and the braking disc (3) with each other in a floating state, in which a plurality of outer peripheral recesses (7) are formed in an outer periphery of the braking disc (3) at a distance from one another in a circumferential direction to form the outer periphery into a corrugated shape, wherein depths (d) of the outer peripheral recesses (7) from an outer peripheral circle (C) of the braking disc (3) are set shallow. The depth (d) of the outer peripheral recesses (7) is set to 7 mm or less.

Abstract: A brake disc having reduced noise, configured in such a manner that the generation of noise, such as brake noise, in braking operation is effectively prevented using a simple structure. A brake disc (20) for two-wheeled motor vehicle, provided with a mounting section (12) which is mounted to a wheel, a slide section (11) which slides against a brake pad, a connection section (13) which connects the mounting section (12) and the slide section (11), and weight reducing holes (16) for weight reduction. A slit (21) is formed in the slide section (11). The ratio (L/W) of the length (L) of the slit (21) in the radial direction to the width (W) of the slide section (11) is set in the range of 50-95%, and preferably in the range of 60-90%. The width of the slit (21) is set to 2 mm or less.

Abstract: The present invention provides a brake disc having a corrugated outer periphery capable of effectively preventing brake judder. A brake disc having a corrugated outer periphery 1 comprising a hub disc 4 fixed to a wheel, a braking disc 3 coaxially disposed outside the hub disc 4, and a connection pin 5 connecting the hub disc 4 and the braking disc 3 with each other in a floating state, in which a plurality of outer peripheral recesses 7 are formed in an outer periphery of the braking disc 3 at a distance from one another in a circumferential direction to form the outer periphery into a corrugated shape, wherein depths d of the outer peripheral recesses 7 from an outer peripheral circle C of the braking disc 3 are set shallow. The depth d of the outer peripheral recesses 7 is set to 7 mm or less.