JPH05322006A - 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 are formed in the small diameter part of the torque converter cover 11 of an automatic transmission 1, and an outlet port 11B is formed in the big diameter part of the torque converter cover 11. The positions for forming the inlet ports 11A and the 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]

According to the power transmission device of the present invention, a rotating body is built in a housing, and the housing has a small diameter portion and a large diameter portion which are displaced from each other in the rotation axis direction of the rotating body. In a power transmission device having a diameter portion, an intake port for introducing cooling air outside the housing to the inside of the housing is provided in a small diameter part of the housing, and a predetermined direction is provided in the rotation direction of the rotating body from the intake port. An exhaust port for guiding the air inside the housing to the outside of the housing is provided in the large-diameter portion of the housing that is offset in angle.

[0007]

In the power transmission device of the present invention, an inlet for cooling air is provided in a small-diameter portion of a housing containing a rotating body, and an exhaust port is provided in a large-diameter portion of the housing. By displacing the mouth by a predetermined angle with respect to the rotation direction of the rotating body, the rotation of the rotating body is used to efficiently circulate the cooling air in the housing, thereby enabling sufficient cooling in the housing.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are views for explaining the first embodiment of the present invention.

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. 1) includes a torque converter section 10 and an automatic transmission section 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. 1) 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. 1, the cover 11 has a larger diameter in a portion closer to the engine 40 than in a portion closer to 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"). The intake ports 11A are formed in a portion on the vehicle front side in the small-diameter portion of the cover 11. In the case of this example, three intake ports 11A are formed in a horizontally long shape. On the other hand, the exhaust port 11B is a large-diameter portion of the cover 11 and is drawn from the intake port 11A by the arrow A.
It is formed at a portion deviated by a predetermined angle in the direction, and in the case of this example, one is formed in a square 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
Since air flows along the rotation direction of the vehicle, that is, 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 according to the flow, and FIG.
And the case 12 as shown by the two-dot chain line arrow in FIG.
After flowing along the rotation direction of A (see FIG. 1) (direction of arrow A), it is discharged through the exhaust port 11B in the direction of arrow C in FIG. 2, that is, 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, the air outside the vehicle can be efficiently transferred to the intake port 11A as the vehicle travels.
It will also be taken into A. As a result, the torque converter 12 is surely cooled.

Further, since the intake port 11A is formed in the small diameter portion of the cover 11 and the exhaust port 11B is formed in the large diameter portion thereof, the air can flow through the cover 11 more efficiently. .. That is, the air circulated in the direction of the arrow A in the cover 11 as the case 12A rotates rotates along the inner wall of the cover 11 due to its centrifugal force.
This is because the small-diameter portion, that is, the intake port 11A side, moves from the large-diameter portion, that is, the exhaust port 11B side.

FIG. 2 is a view for explaining the second embodiment of the present invention. In the case of this embodiment, the intake port 11A is formed in the lower portion of the small diameter portion of the cover 11, and the exhaust port 11 is formed.
B is formed above the large diameter portion of the cover 11. Therefore, the air on the lower side of the vehicle is indicated by the arrow B in FIG.
It is sucked into the cover 11 from the direction and discharged upward as indicated by an arrow C in the figure.

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.

[0017]

As described above, according to the power transmission device of the present invention, the inlet for cooling air is provided in the small diameter portion of the housing containing the rotating body, and the exhaust port is provided in the large diameter portion of the housing. Further, since the intake port and the exhaust port are displaced by a predetermined angle in the rotating direction of the rotating body,
By utilizing the rotation of the rotating body, the cooling air can be efficiently circulated in the housing to sufficiently cool the inside of the housing.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a main part showing a first 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.

FIG. 4 is a side view of an essential part showing a second embodiment of the present invention.

[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 rotating body is built in the housing,
In addition, in the power transmission device in which the housing has a small diameter portion and a large diameter portion that are displaced from each other in the rotation axis direction of the rotating body, cooling air outside the housing is provided to the small diameter portion of the housing. An intake port for guiding the inside of the housing is provided, and an exhaust port for guiding the air inside the housing to the outside of the housing is provided in a large-diameter portion of the housing that is deviated from the intake port in the rotation direction of the rotating body by a predetermined angle. A power transmission device characterized by being provided.