JPH0448971Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a differential gear (hereinafter referred to as differential) cooling device for a vehicle.

[Conventional technology]

Conventional methods for cooling differentials installed in automobiles include providing cooling fins in the gear case that houses the differential to increase the heat dissipation area, providing cooling ducts in the differential, and adding differential oil to lubricate the differential. A structure in which an oil cooler for cooling is provided is known. Also known is a method of cooling the differential using air flowing around the differential.

In addition, a duct is provided that communicates the wheel house space separated from the engine room disclosed in Japanese Utility Model Application No. 59-129676 with the space between the floor panel and the undercover. 2. Description of the Related Art A vehicle with an undercover is known in which an opening is provided to allow a space between the undercover and a floor panel to communicate with the outside.

[Problem that the invention attempts to solve]

However, the conventional means of providing cooling fins, cooling ducts, and oil coolers has a complicated structure and does not have a sufficient cooling effect. Also, when air is sent around the differential, this air comes from the front of the vehicle through the radiator, engine room, and floor tunnel to the differential, and as it passes through, it is heated by the radiator, engine room, or exhaust pipe, etc. There was a problem in that the air sent to the differential became high temperature, reducing its cooling effect.

Furthermore, the purpose of the vehicle with the undercover is to lower the temperature of the fuel pipe and brake oil that are arranged in the space between the floor panel and the undercover, and no consideration has been given to cooling the differential.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a differential cooling device for a vehicle that can efficiently cool a differential with a simple structure.

[Means for solving problems]

In order to achieve the above object, the present invention provides an air passage connected to the engine room and leading to the differential gear through a floor tunnel formed between the floor panel of the vehicle body and the undercover. In the differential gear cooling system for a vehicle, the under cover is provided with a reflector and an exhaust port for discharging air flowing through the air passage connected to the engine room in the floor tunnel to the outside, An inlet and an inlet plate for introducing the air discharged to the outside behind the outlet into the air passage in the floor tunnel and guiding it to the differential gear provided in the air passage are installed in the underside. It is attached to the cover.

[Effect]

According to the above configuration, air taken in from the front of the vehicle is heated by cooling the radiator, engine room, exhaust pipe, etc., but this heated air hits the reflector and passes through the exhaust port through the floor tunnel. is discharged outside. Here, the cooled air mixed with outside air is guided from the inlet to the inlet plate and then introduced into the floor tunnel again, allowing the differential to be efficiently cooled.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a vehicle differential cooling device according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 3.
As shown in FIG. 2, an engine room 4 in which a radiator 2 and an engine 3 are housed is provided at the front of a vehicle body 1 of an automobile. A differential 5 is installed at the rear, and a cabin 6 is provided at the top. A floor tunnel 9 is formed between a floor panel 7 provided on the lower surface of the vehicle compartment 6 and an undercover 8 provided on the lower surface of the vehicle body 1. A drive shaft 10 connects the engine 3 and the differential 5 as shown in FIG.
and an exhaust pipe 11 that is discharged from the engine 3.

At an intermediate portion of the floor tunnel 9 between the engine 3 and the differential 5, a reflective plate 12 is provided on the engine 3 side, and an introduction plate 13 is provided on the differential 5 side with an inclination. Each floor tunnel 9 is blocked and sealed. The reflection plate 12 and introduction plate 13 have small holes 12 formed therein.
The drive shaft 10 and the exhaust pipe 1 via a, 13a
1 is passing through. Further, the engine 3 and the differential 5 are mounted on the undercover at the positions where the reflector plate 12 and the introduction plate 13 are attached, respectively.
A discharge port 14 and an inlet port 15 are formed on the side.

Next, the operation and effects of this embodiment configured as described above will be explained. Air taken in from the front of the vehicle body 1 passes through the radiator 2 and the engine room 4 and enters the floor tunnel 9. The air that enters the floor tunnel 9 cools the radiator 2, engine 3, and exhaust pipe 11. It can be warmed up. However, the warmed air hits the reflection plate 12 and is discharged to the outside from the discharge port 14 formed in the undercover 8.

And this discharged air is transferred to the under cover 8.
It mixes with the air below and the temperature drops. Since the inside of the floor tunnel 9 on the side where the differential 5 is provided has a negative pressure, this low-temperature air is guided into the floor tunnel 9 through the introduction port 15 formed in the undercover 8 to the introduction plate 13. will be reintroduced. This low-temperature air can cool the differential 5 and lower the differential oil temperature.

In this embodiment, the inlet 15 in the floor tunnel 9
Although the case has been described in which the plate-shaped introduction plate 13 is attached near the introduction plate 13, the shape of the introduction plate 13 may be an arc shape.

[Effect of idea]

As mentioned above, according to the present invention, the air that is guided through the differential through the floor tunnel of the vehicle is once discharged to the outside and cooled, and then introduced into the floor tunnel again to cool the differential. With a simple structure, the differential can be efficiently cooled and the differential oil temperature can be lowered.

Furthermore, since the reflector and the introduction plate are provided on the undercover, it is possible to completely block the air warmed in the engine room from flowing to the differential gear, so the warm air can be easily discharged by the reflector. The cooled air that has been discharged from the air passageway and mixed with outside air can be easily drawn back into the negative pressure air passage provided with the differential gear through the inlet.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of an embodiment of a vehicle differential cooling system according to the present invention, FIG. 2 is a longitudinal sectional view of a vehicle using this embodiment, and FIG. FIG. 1...Vehicle body, 4...Engine room, 5...Differential, 7...Floor panel, 8...Undercover, 9...Floor tunnel, 12...Reflector, 1
3...Introduction plate, 14...Exhaust port, 15...Introduction port.

Claims (1)

[Scope of utility model registration request] In a differential gear cooling system for a vehicle, the air passage is connected to the engine room and reaches the differential gear through a floor tunnel formed between a floor panel of the vehicle body and an undercover. A reflector plate and a discharge port are provided in the undercover for discharging the air flowing through the air passage connected to the engine room in the floor tunnel to the outside, and the air is discharged to the outside behind the discharge port. The vehicle is characterized in that the under cover is provided with an inlet and an inlet plate for introducing the air into the air passage in the floor tunnel again and guiding it to the differential gear provided in the air passage. Differential gear cooling system.