Patent ID: 8641053

Claim:
An actuator assembly for use in an active suspension, comprising: i) a drive assembly having a first portion and a second portion configured to translate relative to each other, the first portion having a first mass and the second portion having a second mass, the first mass being greater than the second mass; the first portion comprising at least one motor assembly and configured to couple to a sprung mass; the second portion configured to couple to an unsprung mass; ii) a housing disposed about the at least one motor assembly; iii) an air spring assembly disposed about the housing, the air spring assembly having a first portion disposed in proximity to the sprung mass and a second portion disposed in proximity to the unsprung mass, the air spring assembly defining an air volume relative to the housing, the air volume pressurized at an air pressure greater than atmospheric pressure; and iv) a cooling assembly, comprising: a set of closed drive assembly channels disposed on a surface of or integrally formed with the housing and in thermal communication with the drive assembly, the set of drive assembly channels configured to maintain an entirely closed fluid flow path for a fluid within the pressurized air volume such that the fluid is not in contact with air in the pressurized air volume, and a pump disposed in fluid communication with the set of drive assembly channels, the pump configured to circulate a cooling fluid through the set of drive assembly channels.