公开(公告)号：US11614158B2

公开(公告)日：2023-03-28

申请号：US16927172

申请日：2020-07-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Robert Parrish ,  Wenying Yang ,  Zhe Li ,  Abir R. Das ,  Chad M. Huls ,  Anil K. Sachdev

IPC: F16H57/04 ,  F04C2/08 ,  F04C2/10 ,  F04C14/18

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.

公开(公告)号：US20220010874A1

公开(公告)日：2022-01-13

申请号：US16927172

申请日：2020-07-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Robert Parrish ,  Wenying Yang ,  Zhe Li ,  Abir R. Das ,  Chad M. Huls ,  Anil K. Sachdev

IPC: F16H57/04 ,  F04C14/18 ,  F04C2/10 ,  F04C2/08

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.