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:
Sep. 03, 2002
Filed:
Nov. 21, 2000
Kiyoji Minegishi, Aichi, JP;
Jun Tamenaga, Ohbu, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
A frictional transmission apparatus comprising a simple planetary roller mechanism and a brake mechanism, the simple planetary roller mechanism having friction rollers including a sun roller, a planetary roller, and a ring roller. Static friction torque Y obtainable from the brake mechanism is set to fall within the range of 0.1Xd<Y<0.7Xd, where Xd is the value of test torque at which any of the friction rollers starts to make sliding rotations when the test torque is input in gradually increasing values to the sun roller with a carrier and the ring roller fixed stationary. Besides, a squeezing force from the ring roller is set so that Xd, critical test torque, falls within the range of 1.4-10.0 times static friction torque Y of the brake mechanism. The static friction torque Y and the critical test torque Xd are otherwise set to satisfy Y<Xd, as well as dynamic friction torque Ys obtainable from the brake mechanism at a rated revolution speed and limit transmission toque Xs of the simple planetary roller mechanism with the sun roller rotating at the rated revolution speed are set to satisfy 0.65Ys<Xs <3.4Ys.