Borgwarner Inc.

Raj Chandramohanan

Erwin Perry Ellwood, Iii

Kenneth Richard Bischof

Michael Bucking

Robert Thomas Race

Jonathan Reid Williams

A bearing assembly for supporting rotation of a shaft in a turbocharger includes an inner race extending along an axis. The inner race is configured to be coupled to the shaft. The bearing assembly also includes an outer race spaced radially from the inner race and a cage disposed radially between the inner race and the outer race. The bearing assembly further includes a rolling element disposed radially between the outer race and the inner race. The rolling element is disposed within the cage for supporting rotation of the shaft. The outer race defines a lubricant passageway configured to direct lubricant toward the cage.

Bearing assembly for supporting rotation of a shaft in a turbocharger

A turbocharger includes a shaft, a compressor wheel, a turbine wheel, and a bearing assembly including an inner race, a first outer race spaced from the inner race, a second outer race spaced from the inner race, a first rolling element disposed between the first outer race and the inner race, and a second rolling element disposed between the second outer race and the inner race. The bearing assembly includes a first biasing member configured to bias the first outer race toward the second outer race and against the first rolling element, and preload the first rolling element with a preloading force, and a second biasing member configured to bias the second outer race toward the first outer race and against the second rolling element, and preload the second rolling element with a second preloading force. The first preloading force is different than the second preloading force.

Turbocharger including bearing assembly

A turbocharger includes a shaft extending along an axis, a compressor wheel coupled to a first end of the shaft, a turbine wheel coupled to a second end of the shaft and having a first diameter; and a bearing housing extending about the shaft. The bearing housing is disposed between the compressor wheel and the turbine wheel. The bearing housing having a thermal dam having a volume extending circumferentially about the shaft and disposed proximate to the second end of the shaft between the compressor wheel and the turbine wheel. The thermal dam has a second diameter extending radially from the shaft. Moreover, the second diameter of the thermal dam is between 1.1 and 1.2 times greater than the first diameter of the turbine wheel.

Turbocharger having a thermal dam

A heat shield () and method for assembling such is disclosed. The heat shield () may comprise an outer wall () and an inner wall (). The outer wall () includes a first member (), a flange () extending outward from the first member () and a first inner edge (). The first member () extends from the flange () to the first inner edge (). The inner wall () includes a second member (), a rim () extending outward from the second member () and a second inner edge (). The second member () extends from the rim () to the second inner edge (). The inner wall () is spaced apart from the outer wall (), the first and second edges form an air gap () between them, and the inner wall () and the outer wall () form a cavity ().

Heat shield

A product for use with a turbocharger is disclosed. According to a number of variations, the product may include a bearing housing with a bearing assembly positioned in the bearing housing. A shaft may extend through the bearing assembly for rotation. A turbine wheel may be exposed to high temperature exhaust gases and may be connected to the shaft. The product may include a number of features to manage heat transfer and protect the bearing assembly from excessive temperatures that may otherwise result from exposure to the exhaust gases.

Growing community of inventors

Fletcher, NC, United States of America

Raj Chandramohanan