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:
Jul. 05, 2016
Filed:
Jun. 30, 2014
GM Global Technology Operations Llc, Detroit, MI (US);
Jason J. Nolte, Wixom, MI (US);
David P. Schankin, Harrison Township, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A helical LSD includes a case defining an inner cavity and a plurality of grooves disposed around the inner cavity. In addition to the case, the helical LSD includes a plurality of pinion gears. Each pinion gear is disposed in one of the grooves and includes a plurality of gear teeth. Each gear tooth has a top land. The helical LSD further includes at least one helical output gear disposed in the inner cavity of the case. The helical output gear meshes with the pinion gears, and the pinion gears are disposed around the helical output gear. The top land has a surface profile characterized by raised portions and indentations in order to minimize noise and vibration when the pinion gears rotate relative to the case. The surface profile can also be applied to contact surfaces of power transfer units and transfer cases.