Oil cooling circuit of an automatic transmission

Patent metadata

Field	Value
Publication number	US-12066094-B2
Application number	US-202117198465-A
Country	US
Kind code	B2
Filing date	Mar 11, 2021
Priority date	Sep 13, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An oil supply system for an automatic transmission or for an automated manual transmission in a drive train. The oil supply system includes an oil sump and a heat exchanger, wherein the oil supply is provided for at least the following operating states of the automatic transmission:
a converter mode; a drive mode in one of the mechanical gears; and a retarder mode.

To optimize cooling of the oil volume flows in the different operating states two heat exchangers are provided, through which an oil volume flow can be conducted depending on the operating state of the transmission.

First claim

What is claimed is:

1. An oil supply system for an automatic transmission or for an automated manual transmission in a drive train, the oil supply system comprising:
an oil sump providing an oil supply;
a plurality of heat exchangers including a first heat exchanger and a second heat exchanger, at least a portion of the oil supply flowing through the heat exchangers, the oil supply being used for at least the following operating states of the transmission:
a converter mode;
a drive mode in one of a plurality of mechanical gears; and
a retarder mode; and
wherein oil volume flows through the first and second heat exchangers is conducted depending on the operating state of the transmission; and

a single temperature sensor configured for measuring an oil circuit temperature of the oil volume flows in all operating states.

2. The oil supply system of claim 1 , further comprising
a measuring device having a sensor by which a temperature of the oil volume flows flowing into the first and/or the second heat exchanger is measured.

3. The oil supply system of claim 1 , wherein
the heat exchangers have different oil volume flows.

4. The oil supply system of claim 1 , wherein
the oil volume flow through the first heat exchanger and the oil volume flow through the second heat exchanger flow at a volume ratio of 1:2.

5. The oil supply system of claim 1 , further comprising
a plurality of valves controlling the oil volume flows through the first heat exchanger and through the second heat exchanger.

6. The oil supply system of claim 1 , further comprising
a pressure control valve for regulating of an oil volume flow through a converter, wherein the pressure control valve is provided between the converter and the first and second heat exchangers.

7. The oil supply system of claim 1 , further comprising:
a first switching valve; and
a second switching valve, the switching valves in a braking mode of the retarder directs an oil volume flow through the second heat exchanger to dissipate the brake energy.

8. The oil supply system of claim 7 , wherein
the first switching valve is switched in such a way that, when the transmission is in the drive mode, with a mechanical gear of the transmission engaged, an oil volume flow is directed from the oil sump by way of a bypass line through the second heat exchanger and/or through the first heat exchanger.

Assignees

• Voith Patent Gmbh

Inventors

• Fähnle Rainer

Classifications

• F16H2061/0037

  characterised by controlled fluid supply to lubrication circuits of the gearing · CPC title

• F16H61/0021

  Generation or control of line pressure · CPC title

• F16H57/0417

  Heat exchangers adapted or integrated in the gearing · CPC title

• F16D2065/782

  the brake-actuating fluid being used as a coolant · CPC title

• F16D65/78

  Features relating to cooling · CPC title