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: The present invention is to provide a brake disk capable of enhancing the turning performance of a motorcycle by reducing the inertia, and preventing deposition on a braking portion by reducing a temperature variation of the braking portion. A brake disk 1 is provided with a sliding disk 10, a hub disk 20, and a connection pin 31 for connecting the disks 10 and 20 to each other at plural positions in the circumferential direction of the brake disk 1. An engaging convex portion 12 projecting inwardly of the sliding disk 10 is formed on the sliding disk 10 at circumferential positions corresponding to the connection pins 31. An engaging concave portion 24 for receiving the engaging convex portion 12 is formed in the outer periphery of the hub disk 20. An insertion hole 12c for the connection pin 31 is formed in the engaging convex portion 12.

Abstract: The present invention is to provide a brake disk capable of enhancing the turning performance of a motorcycle by reducing the inertia, and preventing deposition on a braking portion by reducing a temperature variation of the braking portion. A brake disk 1 is provided with a sliding disk 10, a hub disk 20, and a connection pin 31 for connecting the disks 10 and 20 to each other at plural positions in the circumferential direction of the brake disk 1. An engaging convex portion 12 projecting inwardly of the sliding disk 10 is formed on the sliding disk 10 at circumferential positions corresponding to the connection pins 31. An engaging concave portion 24 for receiving the engaging convex portion 12 is formed in the outer periphery of the hub disk 20. An insertion hole 12c for the connection pin 31 is formed in the engaging convex portion 12.

Abstract: Provided is a brake disc capable of suppressing wear of a brake pad, improving braking performance, and preventing occurrence of heat shrinkage between weight reduction holes. In a brake disc 1 for a two-wheeled motor vehicle, the brake disc 1 including a plurality of weight reduction holes 12 for weight reduction formed in a slide section 11 making sliding contact with a brake pad 2, a plurality of grooves 13 is formed at predetermined intervals in a circumferential direction so as to pass through a plurality of adjacent ones of the weight reduction holes 12, the grooves being formed on at least one of slide surfaces 11a of the slide section 11. Each of the grooves 13 is formed into a linear or curved shape from an inner circumference through an outer circumference of the slide section 11.

Abstract: Provided is a brake disc capable of suppressing wear of a brake pad, improving braking performance, and preventing occurrence of heat shrinkage between weight reduction holes. In a brake disc 1 for a two-wheeled motor vehicle, the brake disc 1 including a plurality of weight reduction holes 12 for weight reduction formed in a slide section 11 making sliding contact with a brake pad 2, a plurality of grooves 13 is formed at predetermined intervals in a circumferential direction so as to pass through a plurality of adjacent ones of the weight reduction holes 12, the grooves being formed on at least one of slide surfaces 11a of the slide section 11. Each of the grooves 13 is formed into a linear or curved shape from an inner circumference through an outer circumference of the slide section 11.

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.