Hydraulic Gerotor pump for automatic transmission

US11614158B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Robert Parrish · White Lake, US
• Wenying Yang · Rochester Hills, US
• Zhe Li · Shanghai, CN
• Abir Das · Survanagiri, IN
• Chad M. Huls · Royal Oak, US
• Anil K. Sachdev · Rochester Hills, US

Key dates

• Filing date: Jul 13, 2020
• Grant date: Mar 28, 2023
• Expiry date: Apr 7, 2041

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2251/044
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A hydraulic gerotor pump for an automatic transmission may comprise a housing and a gear set rotatably disposed within the housing. The gear set may comprise an inner gear and an outer gear having radially opposed intermeshing teeth that together define a plurality of circumferentially disposed variable volume pumping chambers therebetween. The housing may be made of a first aluminum-based material, and the inner gear and the outer gear of the gear set may be made of a second aluminum-based material. The linear coefficient of thermal expansion of the first aluminum-based material may be substantially the same as that of the second aluminum-based material.