Insulating spacer for ball bearing cartridge
First Claim
Patent Images
1. A turbocharger comprising:
- a rotating assembly comprising a shaft (50) and a turbine wheel (51) solidly affixed to one end of the shaft,a bearing housing (3) supporting a rolling element bearing comprising an inner race (65) and an outer race (64) which are each provided with a raceway, and a series of rolling elements which are in contact with the raceways of each race,a thermal barrier element (90) carried on said shaft between said turbine wheel and said inner race, anda piston ring boss (56) at the turbine end of the shaft, the piston ring boss (56) having a compressor-facing end (55),wherein said shaft (50) is supported for rotation by said rolling element bearing, and said thermal barrier element (90) is provided between said piston ring boss compressor-facing end (55) and said inner race (65).
1 Assignment
0 Petitions
Accused Products
Abstract
A turbocharger using a high speed rolling element bearing system is improved in desired speed and life by providing an insulating spacer, with a thermal conductivity lower than that of the material in the inner race of the REB, between the turbine-end of the inner race of the bearing system and the compressor-end face of the piston ring boss to impede the flow of heat from the turbine wheel to the inner race of the rolling element bearing.
22 Citations
11 Claims
-
1. A turbocharger comprising:
-
a rotating assembly comprising a shaft (50) and a turbine wheel (51) solidly affixed to one end of the shaft, a bearing housing (3) supporting a rolling element bearing comprising an inner race (65) and an outer race (64) which are each provided with a raceway, and a series of rolling elements which are in contact with the raceways of each race, a thermal barrier element (90) carried on said shaft between said turbine wheel and said inner race, and a piston ring boss (56) at the turbine end of the shaft, the piston ring boss (56) having a compressor-facing end (55), wherein said shaft (50) is supported for rotation by said rolling element bearing, and said thermal barrier element (90) is provided between said piston ring boss compressor-facing end (55) and said inner race (65). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A turbocharger comprising:
-
a rotating assembly comprising a shaft (52) and a turbine wheel (51) solidly affixed to one end of the shaft, and a piston ring boss (56) at the turbine end of the shaft, the piston ring boss (56) having a compressor-facing end face (55); and a rolling element bearing comprising an inner race and an outer race which are each provided with a raceway, and a series of rolling elements which are in contact with the raceways of each race, the inner race including a piston ring boss facing end face, wherein said shaft is supported for rotation by said rolling element bearing, wherein at least one of said piston ring boss (56) compressor-facing end face (55) and said inner race piston ring boss (56) facing end face are coated with a low thermal conductance coating.
-
Specification