To reduce weight of a truck and simplify structure of the truck and facilitate maintenance, testing and also initial large braking force and cleaning of tread effectively while employing relatively small weight amount cylinder structure by using oil pressure.
A brake body A attached to a truck 1 side, a hydraulic piston 7 forming the brake body A for actuating so as to brake and cancel brake of a wheel by separating or contacting a lining to a brake disc of a wheel 6 are mounted and abrasive 15 of a tip on a wheel tread of a wheel 6 is separated or contacted to a hydraulic tread cylinder 14 attached to the brake body A to actuate so as to clean the tread and high pressure oil pressure is supplied to the hydraulic cylinder 7 and the hydraulic tread cylinder 14 from a hydraulic supply source 12 when braking is instructed.
SAWADA MASANORI
KUBOTA SUSUMU
ABE YUKIO
SUMITOMO METAL IND
KAYABA INDUSTRY CO LTD
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