JPH06108845A - Structure of arrangement of oil cooler - Google Patents

Abstract

PURPOSE:To provide an oil cooler for an automatic transmission and the like without increasing the size of a radiator as well as ventilating resistance, and to improve its cooling performance. CONSTITUTION:An oil cooler 34 of an automatic transmission 21 connected to a transverse engine 20, is provided at a point which is in a ventilation path leading from a radiator 10 to the engine 20 in the rear, and which is in the middle of a cooling water outlet route 24 for returning cooling water from the radiator 10 to the engine 20. An automatic transmission is provided in the rear of the oil cooler 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for arranging an oil cooler for cooling hydraulic oil of an automatic transmission of a vehicle.

[0002]

2. Description of the Related Art Conventionally, the oil cooler as described above is
It is provided in a radiator tank (for example, a lower tank) arranged in front of the engine, and is configured to cool the oil by heat exchange with engine cooling water flowing in the radiator (JP-A-56-121817). reference).

However, if the oil cooler is provided in the radiator tank in this way, the tank must be increased in size, which increases the ventilation resistance of the radiator and reduces the size and weight of the radiator. It becomes an obstacle. In addition, the arrangement of piping for connecting the oil cooler to the automatic transmission and the like becomes complicated, and the length of the piping itself increases.

Therefore, in recent years, various types of the oil cooler provided outside the radiator have been known. For example, Japanese Utility Model Laid-Open No. 1-162031 discloses that the oil cooler is arranged on one side of an engine and at an outlet of engine cooling water from the engine.

[0005]

Even when the oil cooler is arranged outside the radiator as described above, the cooling performance of the oil cooler which is equal to or higher than that when the oil cooler is provided in the radiator tank is ensured. Is desired. However, the above-mentioned Jitsukai Sho 1-162031
In the structure disclosed in the publication, an oil cooler is provided on the side surface of the engine in a relatively high temperature state, and little consideration is given to the improvement of its cooling performance.

In view of such circumstances, it is an object of the present invention to provide an arrangement structure of an oil cooler capable of improving the cooling performance of the oil cooler while preventing the radiator from becoming large and the ventilation resistance from increasing. To do.

[0007]

According to the present invention, in a vehicle in which a radiator is provided in front of an engine, ventilation from the radiator to the engine is provided in the middle of a cooling water outlet passage for returning cooling water from the radiator to the engine. An oil cooler is arranged in the road (Claim 1).

Here, when the oil cooler is used to cool the hydraulic oil of the automatic transmission connected to the horizontally placed engine, the automatic transmission may be arranged behind the oil cooler (claim) Item 2).

[0009]

According to the above construction, the oil cooler is disposed outside the radiator, and the oil cooler cools the cooling water outlet passage for returning the cooling water from the radiator to the engine, that is, in the cooling water circulation path. Since the water is arranged in the lowest temperature part and is in the ventilation passage from the radiator to the engine, the cooling performance of the oil cooler is improved by this ventilation and heat exchange with the cooling water.

Further, in the structure according to the second aspect, the automatic transmission to which the oil cooler is connected is arranged at the rear of the oil cooler, and the piping connecting the oil cooler and the automatic transmission is short and simple. Become. Further, since the automatic transmission is generally smaller than the engine, more cooling air to the oil cooler can be secured as compared with the case where the engine is arranged behind the oil cooler.

[0011]

EXAMPLE An example of the present invention will be described with reference to FIGS.

In these figures, 10 is a radiator, and this radiator 10 is provided on the left and right sides of the cooling water inlet tank 1.
2 and cooling water outlet tank 14, both tanks 12, 1
The core 16 is provided between the four. A fan shroud 18 is provided immediately behind it, and an electric fan 19 for blowing air backward from the radiator 10 is provided inside the fan shroud 18.

A horizontal engine 20 is disposed behind the radiator 10, and automatic transmission is performed to the side thereof, more specifically to the left of the engine 20 (right in FIG. 3) when viewed from the passenger compartment. The machine 21 is arranged. The engine 20 is
It is connected to the cooling water inlet tank 12 of the radiator 18 via the cooling water inlet passage 22 and is connected to the cooling water outlet tank 14 via the cooling water outlet passage 24, the thermostat 26, etc., and is led from the engine 20. The high-temperature cooling water thus introduced is introduced into the cooling-water inlet tank 12 through the cooling-water inlet passage 22 and cooled by the core 16, and then in a relatively low-temperature state from the cooling-water outlet tank 14 through the cooling-water outlet passage 24 to the engine 20. Will be returned to.

In FIG. 1, 28 is a throttle body of the engine 20, 30 is a surge tank, and 32 is an intake manifold connected to each cylinder.

Further, as a feature of this structure, an oil cooler 34 for cooling the working oil of the automatic transmission 21 is provided in the middle of the cooling water outlet passage 24. The oil cooler 34 is connected to the automatic transmission 21 through an oil introduction pipe 36 and an oil discharge pipe 38, and the working oil introduced from the automatic transmission 21 through the oil introduction pipe 36 is used as the cooling water outlet. It flows to the outside of the passage 24, and through the oil outlet pipe 38, the automatic transmission 2
It is configured to return to 1.

Incidentally, for the sake of convenience, in FIG.
6 and the oil outlet pipe 38 are not shown.

According to the above structure, since the oil cooler 34 is provided outside both tanks 12 and 14, it is not necessary to upsize these tanks 12 and 14, and the ventilation resistance associated therewith is not required. Does not occur. Moreover, the oil cooler 34 is provided in the middle of the cooling water outlet passage 24 having the lowest cooling water temperature in the cooling water circulation path, and is provided immediately behind the electric fan 19. By exchanging heat with the cooling water flowing through the cooling water outlet passage 24, the cooling performance of the oil cooler 34 can be improved.

Further, in this embodiment, since the oil cooler 34 is arranged behind the cooling water outlet side region (the right side region in FIG. 3) of the radiator 10, this oil cooler 3 is arranged.
As compared with the case where 4 is arranged in the rear of the cooling water inlet side area (left side area in FIG. 3) of the radiator 10, the temperature of the ventilation flowing backward from the radiator 10 is lower, which further improves the cooling performance of the oil cooler 34. ing.

Further, by disposing the automatic transmission 21 behind the oil cooler 34, the oil cooler 3 can be provided as compared with the case where the oil cooler 34 is provided in the cooling water inlet tank 12 or the cooling water outlet tank 14.
4 and the automatic transmission 21 can be greatly shortened, and as a result, the oil introduction pipe 36 and the oil discharge pipe 38 can be reduced.
Can be shortened and the piping work can be facilitated.

In the above embodiment, the oil cooler 34 is provided at the position on the left side (right side in FIG. 3) when viewed from the vehicle compartment. However, due to the cooling water piping, the oil cooler 34 is removed from the vehicle compartment. Even when it is provided on the right side as viewed, by arranging the automatic transmission 21 behind it, the piping of the oil introduction pipe 36 and the oil discharge pipe 38 can be shortened and simplified. However, the oil cooler according to the first aspect of the present invention is not limited to the one for the automatic transmission as described above, but may be applied to an oil cooler for cooling the engine lubricating oil or the like.

[0021]

As described above, according to the present invention, the oil cooler is disposed outside the radiator, and the cooling water outlet passage for returning the cooling water from the radiator to the engine, that is, in the cooling water circulation passage is provided. Since an oil cooler is installed in the part where the cooling water temperature is the lowest and in the ventilation path from the radiator to the engine above, the size of the radiator and ventilation resistance are increased as in the case where an oil cooler is installed in the radiator tank. Without causing an increase in
Moreover, there is an effect that the cooling performance of the oil cooler can be improved by heat exchange with the cooling water and air blowing.

Further, in the structure according to the second aspect, the oil transmission is arranged behind the oil cooler for cooling the working oil of the automatic transmission connected horizontally to the engine. Since it was done,
Compared with the conventional case where an oil cooler is provided in the radiator tank, the piping of the oil cooler can be shortened and simplified, and the piping work can be facilitated. Further, since the automatic transmission is generally smaller than the engine, more cooling air can be secured to the oil cooler and the cooling performance of the oil cooler can be further enhanced, compared to the case where the engine is arranged behind the oil cooler. .

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement structure of an oil cooler according to an embodiment of the present invention.

FIG. 2 is a side view showing the arrangement structure.

FIG. 3 is a front view showing the arrangement structure.

[Explanation of symbols]

 10 radiator 20 engine 21 automatic transmission 24 cooling water outlet passage 34 oil cooler

Claims (2)

[Claims] 1. In a vehicle having a radiator provided in front of an engine, an oil cooler is provided in a ventilation passage from the radiator to the engine in the cooling water outlet passage for returning the cooling water from the radiator to the engine. The arrangement structure of the oil cooler characterized by the above. 2. The oil cooler arrangement structure according to claim 1, wherein the oil cooler is for cooling the hydraulic fluid of an automatic transmission connected to a horizontally installed engine. An arrangement structure of an oil cooler, which is arranged behind the oil cooler.