JPS63225758A - Oil cooler for automatic transmission - Google Patents

Abstract

PURPOSE:To reduce piping in an engine room and to improve the efficiency of an automatic transmission by providing an oil cooler for cooling oil circulating through the automatic transmission therein, and cooling the oil by means of water fed to the engine. CONSTITUTION:An oil cooler 11 is arranged in an automatic transmission 13. Oil cooling water is fed from a cooling water conduit 17b in an engine body 15 through a conduit 18a. Cooling water passed through the oil cooler 11 is returned through a conduit 18b into the main engine 15, or from the main engine 15 to a cooling water return conduit 17a for a radiator 12 through a conduit 18c or to a conduit 19 for a heater core 16 through a conduit 18d. When the oil cooler is arranged between a strainer and an oil pump, piping in an engine room is reduced and the efficiency of automatic transmission can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an oil cooler for automatic transmissions, and is used, for example, in automatic transmissions of automobiles.

(Problems to be Solved by the Invention) FIG. 6 is a diagram showing a conventional oil cooler system for an automatic transmission. In this Fig. 6, the conventional oil cooler 1
is built into the radiator 2, and is cooled by engine cooling water in a double pipe cooling section within the radiator 2.

That is, the oil in the automatic transmission (hereinafter referred to as ATM) 3 is discharged from the ATMa to the radiator 2 through the oil pipe 4a, and is circulated again into the ATM 3 through the rear pipe 4b, which is cooled by the oil cooler 1 in the radiator. It had become.

In Fig. 6, 5 is the engine body, 6 is the heater core, and 7a is the engine body.
and 7b are reciprocating pipes for cooling water.

(Problem to be Solved by the Invention) However, in the conventional oil cooler system as described above, since the oil cooler 1 is placed inside the radiator 2, the oil flow is once outside the ATMa and then re-introduced into the ATMa. It becomes necessary to install the oil pipes 4a and 4b in the narrow engine room for circulating the oil to the engine room.

Moreover, this piping lengthens the oil pipe line and increases piping resistance accordingly. This causes an increase in the power of the oil pump, causing problems such as a decrease in the overall efficiency of the ATM.

This invention was made in order to solve the problems with conventional automatic transmissions as described above, and is an automatic transmission that can reduce the number of pipes in the engine room and improve the overall efficiency of the ATM. The purpose is to provide machine oil coolers.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes an oil cooler that cools oil circulating within the automatic transmission, and an oil cooler that cools the oil circulating within the automatic transmission. This system is characterized by being supplied with oil for cooling.

In another embodiment, the oil cooler may be interposed between a strainer of a hydraulic control circuit of an automatic transmission and an oil pump.

(Function) The oil cooler for the automatic transmission described above performs cooling of oil, which was conventionally performed in the radiator, in the hydraulic control circuit of the automatic transmission, and receives cooling water from the cooling water pipe to the engine. Oil cooling is performed by heat exchange with this cooling water.

Therefore, there is no need for a reciprocating oil conduit between the automatic transmission and the radiator as in the prior art.

Moreover, if the oil cooler is interposed between the strainer of the hydraulic control circuit and the oil pump, the oil cooler will be placed in the oil circulation path within the circuit, further simplifying piping.

(Example) The present invention will be described in more detail below based on an example shown in one drawing.

FIG. 1 shows a system diagram of an oil cooler for an automatic transmission according to the present invention, and an oil cooler 11 is disposed within an ATM 13. The oil cooling water is supplied from the cooling water pipe 17b in the engine body 15 through the pipe 18a, and the cooling water that has passed through the oil cooler 11 is returned to the engine main body 15 through the pipe 18b. The engine main body 1 is
5 to the radiator 12 directly to the return pipe 17a, or through the pipe L8d to the heater core 16.
It is designed to be supplied to a conduit 19 to.

FIG. 2 shows a part of the hydraulic control circuit showing the arrangement of the oil cooler 11 in the automatic transmission, and the oil cooler 11 is interposed between the oil pump 21 and the strainer 22 in the oil pan 20. ing. Therefore, the oil in the oil pan 20 passes through the strainer 22, is cooled by the oil cooler 11, and is then circulated within the hydraulic control circuit by the oil pump 21. In FIG. 2, 23 is a torque converter, and 24 is a regulator valve.

FIG. 3 is an exploded view of the oil cooler 11 shown in FIGS. 1 and 2. The oil cooler 11 is a plate type oil cooler, and an oil cooler case portion 25a is formed in a part of the valve body 25. An oil cooler sub-assembly 27 is installed inside the oil cooler case portion 5a via a gasket 26 and fixed with screws 28.

As shown in the schematic cross-sectional view of FIG. 4, the oil cooler sub-assembly 27 has a double structure in which water channels 27a and oil channels 27b are arranged alternately. heat exchange takes place.

Cooling water is supplied to the water channel 27a of the oil cooler sub-assembly 27 from a cooling water intake port 25b formed on the side of the valve body 25, and the cooling water that has passed through the water channel 27a is discharged from a cooling water outlet 25c. It looks like this. This cooling water intake port 25b is connected to the engine body 15 as described above.
The cooling water outlet 25c is connected to the pipe to circulate the cooling water into the engine body 15, or is connected to the cooling water return pipe 17a to the radiator 12. , or connected to the conduit 19 to the heater core 16.

An oil suction port 27c is formed on one side of the lower surface of the oil cooler sub-assembly 27, and this oil suction port 27c
The oil sucked in from the assy passes through an oil passage 27b in the assy 27 and is discharged from an oil outlet 27d formed on the top surface of the assy.

A strainer 22 is attached to this oil suction port 27c, and an oil discharge port 27d is connected to a suction port 25d formed in the oil cooler case portion 25a.
As shown in the figure, the oil in the oil pan 20 is transferred to the strainer 2.
2 and is sucked into the oil cooler 11 from the oil suction port 27c, and while passing through the oil cooler 11, it is cooled by heat exchange with the cooling water, and then the oil discharge port 27
d is supplied to the oil pump 21.

FIG. 5 shows another embodiment of the oil cooler according to the present invention, and instead of providing an oil cooler case part in the valve body to house the oil cooler as in the embodiment of FIG. Connect the dedicated oil cooler 11° to the conventional valve body 25° via a 26° gasket and screw it to 28°.
It is fixed by

This oil cooler 11° has a sub-assembly similar to that of the above embodiment installed inside the case 31, and this sub-assembly has a double structure in which water channels and passages are arranged alternately. Heat exchange takes place through the separating wall.

The cooling water intake 31a and the cooling water outlet 31b are directly attached to the case 31, the cooling water intake 31a is connected to the cooling water pipe 17b inside the engine body 15, and the cooling water outlet 31b is connected to the cooling water pipe 17b inside the engine body 15. It is connected to a conduit for circulating cooling water to the radiator, to a return conduit 17a from the engine to the radiator, or to a conduit 19 to the heater core. Cooling water intake 31a
The cooling water supplied from the sub-assembly passes through the water channel and is discharged from the cooling water outlet 31b.

Further, an oil suction port 31c is formed on the bottom surface of one end of the case 31, and an oil discharge port 31d is formed on the top surface of the other end of the case 31.
is formed. A strainer 22'' is attached to the oil suction port 31c, and the oil sucked from the oil suction port 31c through the strainer 22° passes through the passage of the sub-assembly and is cooled by heat exchange with the cooling water in the water channel. After that, the oil is discharged from the oil discharge port 31d, passes through the passage 25°a of the valve body 25°, and is sucked into the oil pump.

In addition, in the embodiments of the oil cooler as described above, as for the oil cooler sub-assembly, sub-assemblies having various known structures can be used.

(Effects of the Invention) As described above, the present invention has an oil cooler placed inside an automatic transmission so that the oil is cooled by receiving the cooling water supplied to the engine. Compared to the case where an oil cooler is placed in the radiator, there is no need for a reciprocating oil conduit between the radiator and the automatic transmission.

Not only can the number of piping in a narrow engine room be reduced, but the efficiency of the automatic transmission can also be improved due to the reduction in piping resistance.

[Brief explanation of drawings]

Figure 1 is a system diagram of an oil cooler according to the present invention, Figure 2 is a system diagram of an oil cooler according to the present invention.
The diagram shows part of the hydraulic control circuit showing the arrangement of the oil cooler.
Figure 3 is an exploded view showing one embodiment of the same oil cooler;
5 is an exploded view showing another embodiment of the oil cooler according to the present invention, and FIG. 6 is a system diagram of a conventional oil cooler. 11, 11'...Oil cooler. 13... Automatic transmission, 15... Engine body. 17a, 17b... cooling water pipes. 18a, 18b, 18c, 18d--Pipe line. 21...Oil pump. 22, 22°...Strainer. 27...Oil cooler subassembly. 27a...waterway, 27b...oilway.

Claims (1)

[Claims] 1. An oil cooler that cools oil circulating within an automatic transmission, characterized in that it is disposed within the automatic transmission and cools the oil by receiving cooling water supplied to the engine. Oil cooler for automatic transmission. 2. The oil cooler for an automatic transmission according to claim 1, wherein the oil cooler is interposed between a strainer of a hydraulic control circuit of the automatic transmission and an oil pump.