Cooling systems for turbocharger mechanisms

Claim 1

A cooling system for engine turbocharger mechanisms comprising: a. a main engine driven pump, b. fluid supply means, c. main passage means from said supply means connecting said pump to said turbocharger mechanism for pressure supply of fluid to the latter; d. an auxiliary pump, e. an electric circuit, f. motor means in said electric circuit driving said auxiliary pump; g. passage means communicating with said fluid supply means and connecting the auxiliary pump and into the main passage means in by-passing relation to the main pump, h. pressure responsive means in the passage means of said main pump, i. temperature responsive means in said turbocharger mechanism, j. switch mEans in said circuit operable by said pressure responsive means, k. said switch means being arranged to open the circuit to the drive means for said auxiliary pump when said main pump is operating and to close the circuit to the drive means for said auxiliary pump when said main pump is not operating, l. said temperature responsive means being in said electric circuit in series with said switch means and arranged to close the circuit only at selected temperature levels wherein said auxiliary pump is placed in operation only when the main pump is not operating and the temperature of the turbocharger mechanism is at a selected level determined by the temperature responsive device.