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:
Mar. 05, 2019
Filed:
Jan. 10, 2013
Allison Transmission, Inc., Indianapolis, IN (US);
Andrew De Freitas, Wigan, GB;
Brian Dutson, Manchester, GB;
ALLISON TRANSMISSION, INC., Indianapolis, IN (US);
Abstract
In a toroidal variator a plurality of rolling elements () are in driving engagement with an input and output race () at respective contact regions. Each rolling element () is mounted on a carriage assembly () for rotation about a rolling axis, and is being free to pivot about a tilt axis, the tilt axis passing through the rolling element () perpendicular to the rolling axis, and intersecting the rolling axis at a roller center, whereby a change in the tilt axis causes a change in the variator ratio being the ratio of rotational speeds of the races. The tilt axis is arranged at an angle known as castor angle (see FIG.) to a plane (P) perpendicular to the variator axis (V). Each carriage assembly () can cause a movement of the rolling element () with a component of rotation about a pitch axis (A, B). The pitch axis is defined as passing through the roller center and through the contact regions. Pitching the roller elements () causes them to tilt, thereby changing the transmission ratio.