The Yokohama Rubber Co., Ltd.

Jun Shimada

Hideyuki Oishi

Takashi Shirokawa

Shigeru Shinoda

Kazuhiro Yamada

Jun Arakawa

Disclosed is a track belt for a snowmobile, which comprises a track belt main body, a core body arranged along a longitudinal direction of the track belt main body, reinforcing woven cloths disposed respectively in the outside and inside of the core body, cover layers for covering these reinforcing woven cloths and a plurality of horizontal rigid members placed at specified intervals in the longitudinal direction of the track belt main body and in the cross direction of the same. Overlapping of the reinforcing woven cloth is disposed respectively in the outside and inside of the horizontal rigid members. Reinforcing woven cloth is made by spirally winding a belt-like woven cloth having a specified width on a circumference of the track belt main body at a specified angle to the longitudinal direction of the track belt main body. Reinforcing woven cloths are made of tire fabric cords. A cord orientation angle of each of the tire fabric cords is set to a specified bias angle to the longitudinal direction of the track belt main body. End of the reinforcing woven cloths are butt-joined at both ends so as to have substantially an endless structure. A horizontal rigid member is disposed between the core body and the inner reinforcing woven cloth. Alternatively, the inner reinforcing woven cloth of the core body is folded on the core body or the outer reinforcing woven cloth in the longitudinal direction of the track belt main body on the circumference of the same.

Track belt for snowmobile

This invention relates to a rubber composition for seismic isolation laminate which exhibits excellent damping capacity as well as sufficient hardening properties. Such rubber composition for a seismic isolation laminate comprises at least a diene rubber; and 40 to 160 parts by weight of carbon black having a CTAB specific surface area of 120 to 370 (m,/g) and a CTAB specific surface area (m,/g)/iodine adsorption (mg/g) of up to 1.0 per 100 parts by weight of the diene rubber.

Rubber composition for seismic isolation laminates

Rubber compositions of a selected base rubber and a specified paraffin was containing 50% or more of a normal paraffin and having a carbon area ratio of less than 4.0 as determined by gas chromatography within a carbon number range of from 23 to 42. The ratio is derived by counting a first paraffin content which is defined by the paraffin of maximum content in the wax and a second paraffin content which is defined by the paraffin of minimum content in the wax and thereafter dividing the first paraffin content by the second paraffin content. The composition is highly stable in initial tack with less dependence on temperature before curing.

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Hiratsuka, Japan

Jun Shimada