Sunstar Engineering Pte. Ltd.

The Doshisha

Tsuyoshi Nakatsuji

Kiyotaka Obunai

Hoshiaki Terao

Yoshinori Shinagawa

Raita Wada

Toru Fujii

Kazuya Okubo

Yoshihisa Kubota

Hideaki Okada

Yoshio Hoshi

Tooru Fujii

Kazuya Ookubo

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 &#x3bc;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 dof b1 and an average particle size dof b2 satisfy d&#x3c;d. 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.

Sintered friction material for brake

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.

Brake disc

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 () comprising a hub disc () fixed to a wheel, a braking disc () coaxially disposed outside the hub disc (), and a connection pin () connecting the hub disc () and the braking disc () with each other in a floating state, in which a plurality of outer peripheral recesses () are formed in an outer periphery of the braking disc () 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 () from an outer peripheral circle (C) of the braking disc () are set shallow. The depth (d) of the outer peripheral recesses () is set to 7 mm or less.

Brake disc having corrugated outer periphery

Growing community of inventors

Takatsuki, Japan

Tsuyoshi Nakatsuji