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. 16, 2021
Filed:
Mar. 01, 2018
GM Global Technology Operations Llc, Detroit, MI (US);
Kenneth C. Tesner, Farmington Hills, MI (US);
David J. Varda, West Bloomfield, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A transmission having a pressure controlled vent system, including a vent tube configured to engage a transmission such that a first opening of the vent tube is in fluid communication with an upper portion of a transmission cavity, a second end defining a second opening configured to be in fluid communication with an external atmosphere, and a bifurcated portion between the first end and the second end. The bifurcated portion includes a first tube segment and a second tube segment in parallel with the first tube segment. A pressure relief valve disposed in-line within the first tube segment and a vacuum relief valve disposed in-line within the second tube segment. The pressure relief valve cooperates with the vacuum relief valve to maintain a predetermined range of pressure differential between the first opening and the second opening. The vent tube may also include a moisture and/or a transmission fluid separator.