JPH11257483A - Control unit mounting structure of automatic transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the increase of the temperature of a control unit base board arranged in the oil pan of an automatic transmission. SOLUTION: A recessed part 12 is formed in an upper surface of an upper body 5a contained in an oil pan, and by laminating a plate 10 in a manner to cover the recessed part 12, a volume chamber to contain oil is formed, and further, a control unit base board 11 is laminated on the plate 10. Oil (ATF), the heat of which is dissipated by an oil cooler, is fed to the recessed part 12 through a feed port 13 provided with a restrictor 15. Oil heat-exchanged with the base plate 11 is fed to a control valve through a discharge port 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control unit mounting structure for an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art Conventionally, an automatic transmission for a vehicle has been configured in which a hydraulic pressure applied to a control valve is controlled by energizing control of a solenoid, and hydraulic pressure is supplied to each friction engagement element (clutch, brake, etc.) via the control valve. Machines are known.

[0003]

In the automatic transmission for a vehicle, a control unit for controlling the energization of the solenoid is generally installed in a vehicle interior or an engine room. There was no need for measures against the rise. However, when the control unit is configured to be housed in the oil pan of the automatic transmission, the control unit is greatly affected by ATF (Automatic Transmission Fluid),
There is also a problem that there is a temperature rise due to self-heating, and there is a possibility that the element temperature of the control unit may rise beyond the allowable temperature.

The present invention has been made in view of the above problems, and has as its object to provide a cooling means capable of suppressing a rise in the temperature of a control unit within an allowable range when the control unit is housed in an oil pan. And

[0005]

According to the first aspect of the present invention, a concave portion is provided on an upper surface of a valve body housed in an oil pan so that oil is circulated through the valve body. On the other hand, a plate is laminated on the upper surface of the valve body so as to cover the recess, and so as to face the recess with the plate interposed therebetween.
The substrate of the control unit was laminated on the plate.

According to this structure, the recess is disposed below the board of the control unit with the plate interposed therebetween.
The oil circulated in the recess exchanges heat with the substrate, and when the substrate temperature is higher than the oil temperature, the oil is circulated by removing heat from the substrate. According to the second aspect of the present invention, a configuration is provided in which a throttle for adjusting the pressure in the concave portion is provided in a passage for supplying oil to the concave portion.

According to this configuration, the pressure in the concave portion is adjusted by the throttle, and in particular, an increase in the pressure in the concave portion at a low temperature when the viscosity of the oil increases is suppressed. According to the third aspect of the invention, the oil immediately after passing through the oil cooler is supplied to the recess. According to such a configuration, the oil that radiates heat in the oil cooler and has the lowest temperature is supplied to the recess, and exchanges heat with the substrate.

[0008]

According to the first aspect of the present invention, the substrate of the control unit is laminated on the upper surface of the valve body, and the control unit is accommodated in the oil pan, and is arranged opposite to the substrate via the plate. By circulating the oil through the concave portion and exchanging heat with the substrate, there is an effect that the temperature rise of the substrate can be suppressed by using oil (ATF) of the automatic transmission as a refrigerant.

According to the second aspect of the present invention, there is an effect that it is possible to prevent an excessive load from being applied to the substrate due to an increase in the pressure of the concave portion. According to the third aspect of the present invention, by supplying the oil whose temperature has been lowered by the oil cooler to the recessed portion, the temperature rise of the substrate of the control unit can be stably and efficiently suppressed.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing an automatic transmission for a vehicle according to the present embodiment. A torque converter 3 is interposed between an engine 1 and a transmission 2. The transmission 2
It is composed of various gears, clutches, brakes, etc.

An oil pan 4 of the transmission 2 accommodates a valve body 5 into which various control valves are inserted. The various control valves include a shift valve, an overrun clutch valve, a lockup control valve, a pressure regulator valve, and the like. The valve body 5
Is composed of an upper body 5a and a lower body 5b which are stacked via a separate plate (not shown). Various solenoids 6 for electronically controlling the hydraulic pressure supplied to the control valve are mounted on the upper body 5a. By controlling the energization of the solenoids 6, the shifting operation and the engagement of the lock-up clutch can be electronically controlled. It has become. The various solenoids 6 include a shift solenoid, a line pressure solenoid, an overrun clutch solenoid, a lock-up solenoid, and the like.

The control unit having a microcomputer for controlling the energization of the solenoid is mounted on the oil pan 4 by a mounting structure as shown in FIG.
Is located within. In FIG. 2, the upper body 5
a, a metal (for example, aluminum) plate 10 is laminated on the upper surface, and a control unit substrate is further placed thereon.
11 (for example, ceramic substrates) are stacked. On the upper surface of the upper body 5a where the substrate 11 is laminated, a concave portion 12 is formed to open upward, and the plate 10 covers the concave portion 12 so that oil (ATF) A possible volume chamber is formed.

In order to protect the electronic components mounted on the substrate 11, the substrate 11 is covered with a cover (not shown) so that the substrate 11 and the electronic components on the substrate 11 are not directly exposed to oil. It has become. A supply port 13 for supplying oil into the concave portion 12 and a discharge port 14 for discharging the oil in the concave portion 12 are opened in the bottom surface of the concave portion 12, and the upper body 5a Oil is circulated in the recess 12 through an oil passage (not shown) formed therein.

A throttle 15 is formed in the supply port 13, and oil (ATF) radiated by an oil cooler (not shown) is provided.
Is supplied into the recess 12 through the aperture 13 and the recess 12
The oil inside is supplied to the control valve through the outlet 14. According to such a configuration, oil that is stably controlled to a low temperature by heat radiation by the oil cooler is supplied into the recessed portion 12 and the adjacent substrate 11
And heat exchange between the oil in the recess 12 and the substrate 11
The temperature of the oil is prevented from rising significantly above the temperature of the oil.

Also, by reducing the pressure of the oil supplied from the oil cooler by the throttle 15,
At low temperatures when the viscosity of the oil increases, the pressure in the recess 12
The increase is suppressed so that an excessive load is applied to the substrate 11, and necessary cooling can be performed at a high temperature.

[Brief description of the drawings]

FIG. 1 is a diagram showing an automatic transmission for a vehicle according to an embodiment.

FIG. 2 is a diagram showing a mounting structure of a control unit board in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Transmission 3 Torque converter 4 Oil pan 5 Valve body 5a Upper body 5b Lower body 6 Solenoid 10 Plate 11 Substrate 12 Concave part 13 Supply port 14 Discharge port 15 Throttle

Claims (3)

[Claims] 1. A valve body accommodated in an oil pan, wherein a concave portion configured to circulate oil through the valve body is provided on an upper surface of the valve body, and the valve body is configured to cover the concave portion. Laminate plates on top of
And a control unit mounting structure for an automatic transmission for a vehicle, wherein a substrate of the control unit is laminated on the plate so as to face the concave portion with the plate interposed therebetween. 2. A control unit mounting structure for an automatic transmission for a vehicle according to claim 1, wherein a throttle for adjusting the pressure in said concave portion is provided in a passage for supplying oil to said concave portion. . 3. The apparatus according to claim 1, wherein the oil immediately after passing through the oil cooler is supplied to the recess.
Or a control unit mounting structure for a vehicle automatic transmission according to 2.