Heat exchanger for vehicle

Patent metadata

Field	Value
Publication number	US-10018102-B2
Application number	US-201615220025-A
Country	US
Kind code	B2
Filing date	Jul 26, 2016
Priority date	Jul 28, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A heat exchanger includes a plurality of plates that is stacked together to constitute first flow passages, second flow passage, third flow passage, fourth flow passage and fifth flow passage. An engine coolant flows through the first flow passages. An engine oil flows through the second flow passages and fourth flow passages. A transmission oil flows through the third flow passages and fifth flow passages. Triple-flow-passage arrangement layers in each of which each first, second, and third flow passages are disposed, and dual-flow-passage arrangement layers in each of which each fourth and fifth flow passages are disposed are alternately arranged such that flow passages of each same type are not overlaid with one another in a stacking direction of the plates.

First claim

What is claimed is:

1. A heat exchanger for a vehicle, the vehicle including an engine and a transmission, the heat exchanger comprising:
first flow passages configured to bring an engine coolant to flow through the first flow passages;
second flow passages configured to bring an engine oil to flow through the second flow passages;
third flow passages configured to bring a transmission oil to flow through the third flow passages;
fourth flow passages configured to bring the engine oil having flowed through the second flow passages to flow through the fourth flow passages;
fifth flow passages configured to bring the transmission oil having flowed through the third flow passages to flow through the fifth flow passages;
a plurality of plates configured to partition the first flow passages, the second flow passages, the third flow passages, the fourth flow passages, and the fifth flow passages;
a first communicating passage configured to communicate the second flow passages with the fourth flow passages; and
a second communicating passage configured to communicate the third flow passages with the fifth flow passages;
wherein
the first flow passages are configured to bring the engine coolant to be heat-exchanged with both the engine oil in the fourth flow passages and the transmission oil in the fifth flow passages via the plates,
the fourth flow passages are configured to bring the engine oil to be heat-exchanged with both the transmission oil in the third flow passages and the engine coolant in the first flow passages via the plates,
the fifth flow passages are configured to bring the transmission oil to be heat-exchanged with both the engine oil in the second flow passages and the engine coolant in the first flow passages via the plates,
triple-flow-passage arrangement layers in each of which each first flow passage, each second flow passage, and each third flow passage are disposed in the same layer, and dual-flow-passage arrangement layers in each of which each fourth flow passage and each fifth flow passage are disposed in the same layer are alternately arranged in a stacking direction of the plates in such a manner that flow passages of the same type are not overlaid with one another in the stacking direction of the plates,
each fifth flow passage is disposed upstream of a flow direction of the engine coolant in each first flow passage,
each fourth flow passage is disposed downstream of the flow direction of the engine coolant in each first flow passage,
each third flow passage is disposed upstream of a flow direction of the engine oil in each fourth flow passage,
each first flow passage is disposed downstream of the flow direction of the engine oil in each fourth flow passage,
each second flow passage is disposed upstream of a flow direction of the transmission oil in each fifth flow passage, and
each first flow passage is disposed downstream of the flow direction of the transmission oil in each fifth flow passage.

2. The heat exchanger according to claim 1 , wherein
an inflow port and an outflow port of the engine coolant in the first flow passage, and an inflow port and an outflow port of the engine oil in the fourth flow passage are arranged such that the flow direction of the engine coolant in each first flow passage and the flow direction of the engine oil in each fourth flow passage are in counter-flow relative to each other.

3. The heat exchanger according to claim 1 , wherein
an inflow port and an outflow port of the engine coolant in the first flow passage, and an inflow port and an outflow port of the transmission oil in the fifth flow passage are arranged such that the flow direction of the engine coolant in each first flow passage and the flow direction of the transmission oil in each fifth flow passage are in counter-flow relative to each other.

4. The heat exchanger according to claim 1 , wherein
an inflow port and an outflow port of the engine oil in the second flow passage, and an inflow port and an outflow port of the transmission oil in the fifth flow passage are arranged such that the flow direction of the engine oil in each second flow passage and the flow direction of the transmission oil in each fifth flow passage are in counter-flow relative to each other.

5. The heat exchanger according to claim 1 , wherein
an inflow port and an outflow port of the engine oil in the fourth flow passage, and an inflow port and an outflow port of the transmission oil in the third flow passage are arranged such that the flow direction of the engine oil in each fourth flow passage and the flow direction of the transmission oil in each third flow passage are in counter-flow relative to each other.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tokozakura Daisuke
• Arakawa Kazuya
• Shiina Takahiro

Classifications

• F28D2021/0089

  Oil coolers · CPC title

• F01P2060/04

  Lubricant cooler · CPC title

• F28D9/04

  the conduits being formed by spirally-wound plates or laminae · CPC title

• F01P2060/045

  for transmissions · CPC title

• F28D9/005

  the plates having openings therein for both heat-exchange media · CPC title