JPH05322007A - Power transmission - Google Patents

Abstract

PURPOSE:To cool the inside of a housing thoroughly, by providing a circulation of cooling air efficiently in the housing including a rotor. CONSTITUTION:Cooling air inlet ports 11A and an outlet port 11B are formed in the torque converter cover 11 of an automatic transmission 1, and the position for forming these inlet ports 11A and outlet port 11B are shifted in the direction of rotation of the case 12A of a torque converter 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device such as a vehicle transmission in which a rotating body is built in a housing, and more particularly to a power transmission device having a function of cooling the housing.

[0002]

2. Description of the Related Art Conventionally, as a device of this type, for example,
Japanese Utility Model Publication No. 56-15851 and Japanese Utility Model Publication No. 60-18
The one described in Japanese Patent No. 2558 is known.

In the former device, in order to cool the inside of the housing, an air-cooling ventilation pipe is attached to the outside of the housing, and air near the outer peripheral portion of the rotating body in the housing is passed through the ventilation pipe to rotate the air in the housing. It is configured to circulate by guiding it to a position closer to the center of.
On the other hand, the latter device uses the
A large number of cooling air inlets are provided along the circumference of the outer peripheral portion of the housing.

[0004]

However, the former one of the above-mentioned conventional devices has the trouble of providing the ventilation pipe, and the ventilation pipe restricts the circulation flow rate of the air in the housing. In the latter case, the flow of air in the housing is disturbed due to the large number of cooling air inlets, and the flow rate of air passing through the housing is reduced. In the end, in both cases, the flow rate of the air passing through the housing was small, and the inside of the housing could not be cooled sufficiently.

An object of the present invention is to provide a power transmission device capable of efficiently circulating cooling air in a housing containing a rotating body to sufficiently cool the inside of the housing.

[0006]

A power transmission device of the present invention is a power transmission device in which a rotating body is built in a housing, and cooling air outside the housing is introduced into the housing. An intake port is provided, and an exhaust port for guiding the air inside the housing to the outside of the housing is provided at a portion of the housing that is deviated from the intake port in the rotation direction of the rotating body by a predetermined angle.

[0007]

The power transmission device of the present invention utilizes the rotation of the rotating body by providing the housing for accommodating the rotating body with the intake port and the exhaust port for the cooling air which are displaced by a predetermined angle in the rotating direction of the rotating body. As a result, cooling air can be efficiently circulated in the housing to enable sufficient cooling in the housing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

This embodiment is an example of application to a torque converter section 10 incorporated in an automatic transmission (automatic transmission) 1 for a front-wheel drive vehicle with an engine placed horizontally. As is well known, this type of automatic transmission 1 (see FIG. 2) includes a torque converter unit 10 and an automatic transmission unit 20.
And the final drive unit 30, and the engine 4
The transmission torque between 0 and the left and right front wheels 50, 50 can be varied. Further, the torque converter unit 10
Has a configuration in which a torque converter 12 (see FIG. 2) is provided inside a torque converter cover (housing) 11. As is well known, the torque converter 12 includes a pump impeller (not shown) connected to the crankshaft 41 side of the engine 40 and a turbine runner (not shown) connected to the input shaft 21 side of the automatic transmission unit 20. The oil is interposed between the case 12A (rotating body) itself of the torque converter 12 in which the pump impeller is provided inside the cover 11 in order to smoothly transmit the former rotational torque to the latter. Rotates with the crankshaft in the direction of arrow A about the axis 0 thereof.

As shown in FIG. 2, the cover 11 has a larger diameter at a portion near the engine 40 than at a portion near the automatic transmission portion 20, and the former portion (hereinafter referred to as "small diameter portion"). ) Is formed with an intake port 11A penetrating the inside and outside thereof, and an exhaust port 11B penetrating the inside and outside thereof is formed in the latter part (hereinafter referred to as "large diameter part"). As shown in FIG. 1, the intake port 11A is formed at a portion of the cover 11 on the vehicle front side in the small diameter portion,
In the case of this example, three laterally elongated shapes are formed. On the other hand, as shown in FIG. 1, the exhaust port 11B is formed in a large-diameter portion of the cover 11 and at a portion deviated from the intake port 11A in the direction of arrow A by a predetermined angle. One is formed in the shape.

FIG. 3 shows a specific example of the structure of the cover 11. In this example, a part or the whole of the cover 22 of the automatic transmission unit 20 is integrally formed with the cover 11.

In the torque converter unit 10 thus constructed, the case 12A of the torque converter 12 rotates in the direction of arrow A inside the cover 11 so that the air on the front side of the vehicle is covered from the intake port 11A. It is sucked into the inside 11 and discharged to the outside through the exhaust port 11B. That is, in the cover 11, the case 12A
2 is generated in the direction of arrow A, the air on the front side of the vehicle is sucked into the intake port 11A from the direction of arrow B in accordance with the flow of the air, and FIG.
After flowing in the rotation direction (arrow A direction) of the case 12A as indicated by the two-dot chain line arrow in the inside, it is discharged through the exhaust port 11B in the direction of arrow C in FIG. 2, that is, the direction of the hood of the vehicle. In this way, the flow of air generated by the rotation of the case 12A is effectively used, and the air flows through the cover 11. Further, since the intake port 11A faces the front side of the vehicle, air outside the vehicle is efficiently taken into the intake port 11A as the vehicle travels. As a result, the torque converter 12 is surely cooled.

Further, in the case of this embodiment, the intake port 11A
Is formed in the small diameter portion of the cover 11, and the exhaust port 11B
Since it is formed in the large diameter part, more efficiently,
Air will circulate in the cover 11. That is,
The air circulated in the direction of the arrow A in the cover 11 as the case 12A rotates rotates due to the centrifugal force.
This is because along the inner wall of No. 1, the small-diameter portion, that is, the intake port 11A side, moves to the large-diameter portion, that is, the exhaust port 11B side.

The power transmission device of the present invention is, for example,
The present invention can be widely applied as various power transmission devices such as a torque converter unit incorporated in an automatic transmission for a rear-wheel drive vehicle.

[0015]

As described above, the power transmission device of the present invention has a structure in which the housing for accommodating the rotating body is provided with the intake port and the exhaust port for the cooling air which are offset from each other by a predetermined angle in the rotating direction of the rotating body. Therefore, it is possible to efficiently circulate the cooling air in the housing by utilizing the rotation of the rotating body and sufficiently cool the inside of the housing.

[Brief description of drawings]

FIG. 1 is a schematic side view of a main part showing an embodiment of the present invention.

FIG. 2 is a view on arrow II of FIG.

FIG. 3 is a front view showing a specific configuration example of the torque converter cover shown in FIG.

[Explanation of symbols]

 1 Automatic Transmission 10 Torque Converter Section 11 Torque Converter Cover (Housing) 11A Intake Port 11B Exhaust Port 12 Torque Converter 12A Case (Rotating Body)

Claims (1)

[Claims] 1. A power transmission device having a rotating body built in a housing, wherein the housing is provided with an intake port for introducing cooling air outside the housing to the inside of the housing. A power transmission device, wherein an exhaust port for introducing air inside the housing to the outside of the housing is provided at a portion of the housing that is deviated from the housing by a predetermined angle.