The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2005
Filed:
Mar. 19, 2003
Takahisa Yokoyama, Anjo, JP;
Takayuki Takeshita, Anjo, JP;
Haruo Arakawa, Toyota, JP;
Advics Co., Ltd., Aichi-ken, JP;
Abstract
A vehicular brake apparatus, which is provided at a shaft of a motor that revolves due to depression of a brake pedal, has a variable gear mechanism including a non-circular spur gear that changes a reduction ratio from a high gear ratio to a low gear ratio along with revolution. Revolution is converted to linear movement by roller bearings interposed between two ramp portions each having a straight inclined surface, and a friction member is pressed against a disk by a friction material holding portion being moved in a straight direction. Further, a braking force is generated on the disk by the friction member and another friction member provided on the opposite side of the caliper. As a result, it is possible to generate a highly responsive braking force by the high gear ratio when revolution of the motor initially increases, and possible to reduce electric power consumption using a highly efficient motor speed by changing from the high gear ratio to the low gear ratio in accordance with the motor revolution speed.