Patent ID: 7665513
Filing Date: 2010-02-23
Classification: F01P,F16H,G05D,Y10S,Y10T

Abstract:
1. A heat exchanger structure of an automatic transmission, comprising: an automatic transmission; a first heat exchanger provided upstream from a second heat exchanger, relative to a flow direction of oil ejected from the automatic transmission, each capable of exchanging heat of oil ejected from said automatic transmission; a thermo valve case positioned between and contacting both of the automatic transmission and the first heat exchanger; and a thermo valve within the thermo valve case capable of supplying oil subject to heat exchange by at least one of said first heat exchanger and said second heat exchanger to said automatic transmission, the thermo valve having first and second thermo valve input ports, the first thermo valve input port receiving oil from the first heat exchanger and the second thermo valve input port receiving oil from the second heat exchanger, the thermo valve further having a thermo valve output port outputting oil to the automatic transmission, wherein the thermo valve is provided such that the oil passes from the automatic transmission through one or both heat exchangers without first passing through, or contacting, the thermo valve, any oil ejected from the thermo valve output port is not further cooled by either or both heat exchangers before passing through the automatic transmission, the heat exchanger has two systems for cooling oil, a first system including the thermo valve, the first thermo valve input port, and the first heat exchanger, and a second system including the thermo valve, the second thermo valve input port, and the second heat exchanger; when a temperature of the oil is at most a predetermined value, said thermo valve supplies oil passed through said first heat exchanger to said automatic transmission and shuts off a flow of said oil from said second heat exchanger to said automatic transmission; and when a temperature of the oil exceeds the predetermined value, said thermo valve supplies oil passed through said first heat exchanger and said second heat exchanger to said automatic transmission.