Heat exchanger structure of automatic transmission

• US 20060060346A1
• Filed: 07/22/2005
• Published: 03/23/2006
• Est. Priority Date: 08/30/2004
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sasaki, Kazumichi
• Granted Patent: US 7,665,513 B2
• Time in Patent Office: Days
• US Class Current: 165/297
• CPC Class Codes: F01P 11/08 Arrangements of lubricant coolers in lubrication apparatus F01M
• CPC Class Codes: F01P 2025/40 Oil temperature
• CPC Class Codes: F01P 2060/045 for transmissions
• CPC Class Codes: F01P 2060/08 Cabin heater
• CPC Class Codes: F01P 7/165 characterised by systems with two or more loops
• CPC Class Codes: F16H 57/0413 Controlled cooling or heating of lubricant; Temperature control therefor
• CPC Class Codes: F16H 57/0415 Air cooling or ventilation; Heat exchangers; Thermal insulations
• CPC Class Codes: G05D 23/1333 measuring the temperature of incoming fluid
• CPC Class Codes: Y10S 165/916 Oil cooler
• CPC Class Codes: Y10T 74/19991 Lubrication
• CPC Class Codes: Y10T 74/2189 Cooling

Abstract

A heat exchanger structure of an automatic transmission stabilizing a temperature of oil is provided. A heat exchanger structure of an automatic transmission includes an automatic transmission, a first heat exchanger provided on an upstream side and a second heat exchanger provided on a downstream side, each capable of cooling oil ejected from the automatic transmission, and a thermo valve capable of supplying oil subject to heat exchange by at least one of first and second heat exchangers to the automatic transmission. When a temperature of the oil is relatively low, the thermo valve supplies oil passed through the first heat exchanger to the automatic transmission and shuts off a flow of oil from the second heat exchanger to the automatic transmission. When a temperature of the oil is relatively high, the thermo valve supplies oil passed through first and second heat exchangers to the automatic transmission.

Claims

1. A heat exchanger structure of an automatic transmission, comprising:

an automatic transmission;

a first heat exchanger provided on an upstream side and a second heat exchanger provided on a downstream side, each capable of exchanging heat of oil ejected from said automatic transmission; and

a thermo valve 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;

wherein

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.

2. The heat exchanger structure of an automatic transmission according to claim 1, wherein

said thermo valve shuts off a flow of the oil from said second heat exchanger toward said thermo valve when a temperature of the oil is at most the predetermined value, and shuts off a flow of the oil from said first heat exchanger toward said thermo valve when a temperature of the oil exceeds the predetermined value.

3. A heat exchanger structure of an automatic transmission, comprising:

an automatic transmission;

a first heat exchanger and a second heat exchanger each capable of exchanging heat of oil ejected from said automatic transmission; and

a thermo valve 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;

wherein

the oil ejected from said thermo valve is supplied to said automatic transmission without being cooled with the heat exchanger.