JP2000356261A - Oil cooler structure for automatic transmission - Google Patents

Abstract

(57) [Abstract] The present invention aims to reduce the burden on a radiator by arranging a water-cooled oil cooler and an air-cooled oil cooler in series in a working / lubricating oil cooling passage. For this reason, in the oil cooler structure of an automatic transmission, a water-cooled oil cooler for operating the automatic transmission and cooling the lubricating oil is provided separately in a cooling water passage connecting the engine and the radiator. An operating / lubricating oil cooling passage is provided to connect the transmission to the water-cooled oil cooler, and an air-cooled oil cooler is provided in the middle of the operating / lubricating oil cooling passage so as to be in series with the water-cooled oil cooler. ing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler structure for an automatic transmission, and in particular, a water-cooled oil cooler and an air-cooled oil cooler are arranged in a working / lubricating oil cooling passage in series to reduce the load on a radiator. The present invention relates to an oil cooler structure of an automatic transmission to be reduced.

[0002]

2. Description of the Related Art A vehicle is equipped with a manual transmission and an automatic transmission. And, for example, in an automatic transmission,
The working / lubricating oil (also referred to as “ATF” or “A / T oil”) that is pressure-fed by an oil pump in the torque converter is cooled by an oil cooler, and after cooling, is supplied to a lubricated portion in the automatic transmission. I have.

[0003] As an oil cooler structure of an automatic transmission,
There is one disclosed in JP-A-6-108845. The arrangement structure of the oil cooler disclosed in this publication is to cool the oil cooler of the automatic transmission connected to the horizontal engine from the radiator to the engine in the ventilation path from the radiator to the engine behind it. An automatic transmission is arranged in the middle of the cooling water outlet passage for returning water, and an automatic transmission is arranged behind the oil cooler, so that an oil cooler such as an automatic transmission can be used without increasing the size of the radiator and increasing ventilation resistance. It is arranged and the cooling performance is improved.

[0004] There is also one disclosed in Japanese Patent Application Laid-Open No. 6-193445. In the oil cooler arrangement structure disclosed in this publication, an engine having an oil pan at a lower portion is arranged behind a radiator in an engine room, and an under cover provided so as to cover a lower portion of the radiator from a front side thereof. In the vehicle equipped with, the under cover is provided with an opening for guiding the traveling wind to the rear of the radiator in the engine room, and the oil pan of the engine is located behind the opening, and the oil pan is provided with An inclined surface that is inclined downward as it goes is formed, and an oil cooler is arranged in a space between the opening and the inclined surface. By appropriately arranging the oil cooler, the cooling performance of the radiator and the oil cooler is improved. The height of the hood is effectively reduced while preventing damage at the time of a collision without impairing the hood.

[0005]

In the conventional oil cooler structure of an automatic transmission, an automatic transmission 104 is mounted on an engine 102 mounted on a vehicle (not shown) as shown in FIG.

A cooling water passage 1 for connecting the engine 102 with a radiator 106 disposed in front of the vehicle.
08, the operation / lubricating oil (“ATF” or “A /
Water-cooled oil cooler 1 for cooling T oil)
10 are provided.

At this time, an operation / lubricating oil cooling passage 112 for connecting the automatic transmission 104 and the water-cooled oil cooler 110 is provided.

However, as is apparent from FIG. 6, a water-cooled oil cooler 110 is provided in the cooling water passage 108 at the radiator 106 inflow side.

As a result, the burden on the radiator increases, and a sufficient cooling effect cannot be obtained, which is disadvantageous in practical use.

In order to improve the cooling performance of the radiator, measures to increase the size of the radiator and the size of the water-cooled oil cooler may be considered. Was in

[0011]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a water-cooled oil cooler for cooling an operation and lubricating oil of an automatic transmission in a cooling water passage connecting an engine and a radiator. In an oil cooler structure of an automatic transmission provided separately, an operation / lubricating oil cooling passage for connecting the automatic transmission and a water-cooled oil cooler is provided, and a water-cooled oil cooling passage is provided in the middle of the operating / lubricating oil cooling passage. An air-cooled oil cooler is provided so as to be in series with the oil cooler.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
When cooling the operation and lubrication oil flowing through the operation and lubrication oil cooling passage, the operation and lubrication oil is cooled at two places by a water-cooled oil cooler and an air-cooled oil cooler arranged in series, and the radiator is cooled. The burden of is reduced.

[0013]

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

1 to 8 show an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes an engine mounted on a vehicle (not shown).

The engine 2 is equipped with an automatic transmission 4 as shown in FIG.

A cooling water passage 8 is provided for communicating the engine 2 with a radiator 6 disposed in front of the vehicle.
In the course of the cooling water passage 8, the operation of the automatic transmission 4
Lubricating oil (also called "ATF" or "A / T oil")
A water-cooled oil cooler 10 for cooling the oil cooler is provided separately.

At this time, an operation / lubricating oil cooling passage 12 for connecting the automatic transmission 4 and the water-cooled oil cooler 10 is provided. The air-cooled oil cooler 14 is provided so as to be in series with the oil inflow side.

More specifically, as shown in FIG. 1, the automatic transmission 4 is provided with an oil outlet 4a and an oil inlet 4b, and an operating / lubricating oil for connecting the oil outlet 4a and the oil inlet 4b. A cooling passage 12 is provided, a water-cooled oil cooler 10 is provided in the middle of the operation / lubricating oil cooling passage 12, and an air-cooled oil cooler 14 is provided so as to be in series with the water-cooled oil cooler 10. Is what you do.

At this time, the air-cooled oil cooler 14 is connected to the water-cooled oil cooler 10 as shown in FIG.
, That is, in the middle of the working / lubricating oil cooling passage 12 upstream of the water-cooled oil cooler 10.

That is, the working / lubricating oil cooling passage 12
As shown in FIG. 1, an oil outlet 4a of the automatic transmission 4
First working / lubricating oil cooling passage 12-1 that connects the oil cooler 10 and the water-cooled oil cooler 10, and a second working / lubricating oil cooling passage that connects the water cooled oil cooler 10 and the oil inlet 4b of the automatic transmission 4 The air-cooled oil cooler 14 is provided in the middle of the first working / lubricating oil cooling passage 12-1.

As shown in FIGS. 2 to 4, the air-cooled oil cooler 14 is mounted on a steering rack 16 of a vehicle (not shown) on which the engine 2 is mounted by using a steering rack mounting bracket 18 in common.

That is, when the air-cooled oil cooler 14 is mounted on the steering rack 16, as shown in FIGS.
The bent portion 20 is bent at the tip of the air-cooled oil cooler 14 using the folded portion 20.

Further, as shown in FIGS. 2 to 4, a hose 22 for the working / lubricating oil cooling passage 12 is attached to an upper portion of the air-cooled oil cooler 14, and a lower portion of the air-cooled oil cooler 14 is It is mounted and supported on the steering rack mounting bracket 18.

At this time, the air-cooled oil cooler 14
As shown in FIG. 2 and FIG. 3 so as to be directed obliquely downward in front of the vehicle.

As shown in FIGS. 5 and 6, the steering rack mounting bracket 18 has a main body 18-1.
A folded portion 20 is formed at the tip of the curved recess 1 and engages with the steering rack 16.
8-2.

When the air-cooled oil cooler 14 is mounted on the steering rack mounting bracket 18, an oil cooler side bracket 24 is used. The oil cooler-side bracket 24 includes a frame-shaped main body 24-1, a net-shaped mounting portion 24-2 on which the air-cooled oil cooler 14 is mounted, and a folded portion 20 of the steering rack mounting bracket 18. It has a mounting hole 24-3 for mounting, and a fixing hole 24-4 for fixing the air-cooled oil cooler 14 to the mounting portion 24-2.

Next, the operation will be described.

The cooling water flowing through the cooling water passage 8 is shown in FIG.
Is cooled by the radiator 6 and then supplied to the engine 2 to cool the operation / lubricating oil of the automatic transmission 4 from the engine 2 as shown by a thick black arrow in FIG.
After passing through 0, it flows along the cooling water circulation path returning to the radiator 6.

The working / lubricating oil flowing through the working / lubricating oil cooling passage 12 exits from the oil outlet 4a of the automatic transmission 4 as shown by a white arrow in FIG. It reaches 14.

The working / lubricating oil cooled by the air-cooled oil cooler 14 is supplied to the water-cooled oil cooler 1.
After being cooled to 0 by the water-cooled oil cooler 10, it flows along an oil circulation path that is supplied to the oil inlet 4 b of the automatic transmission 4.

At this time, the working / lubricating oil cooling passage 12
The working / lubricating oil flowing through the oil cooler 14 is cooled at two locations: the air-cooled oil cooler 14 and the water-cooled oil cooler 10.

Thus, the working / lubricating oil cooling passage 1
The operation / lubricating oil can be cooled at two places of the water-cooled oil cooler 10 and the air-cooled oil cooler 14 by the water-cooled oil cooler 10 and the air-cooled oil cooler 14 arranged in series with each other. The burden on the radiator 6 can be reduced, which is practically advantageous.

The air-cooled oil cooler 14 is disposed on the inflow side of the water-cooled oil cooler 10, that is, in the middle of the operation / lubricating oil cooling passage 12 on the upstream side of the water-cooled oil cooler 10. After the operation / lubricating oil flowing through the lubricating oil cooling passage 12 is cooled by the air-cooled oil cooler 14, it is cooled by the water-cooled oil cooler 10, so that the burden on the radiator 6 can be reduced reliably and efficiently. Things.

Further, since the air-cooled oil cooler 14 is mounted on the steering rack 16 by using the steering rack mounting bracket 18 in common, there is no need to provide a dedicated bracket, and there is no risk of increasing the number of parts, thereby reducing costs. The air-cooled oil cooler 14 can be laid out without significant changes in the vehicle while being able to be maintained at low cost and economically advantageous. The model can be dealt with only by the presence or absence of the air-cooled oil cooler 14, and other parts can be shared.

Further, since the folded portion 20 formed at the distal end portion of the steering rack mounting bracket 18 can be used as the mounting portion of the air-cooled oil cooler 14, it is easy to manufacture and contributes to cost reduction. At the same time, mounting from the front of the vehicle becomes possible, and the mounting workability can be improved.

A hose 22 for the working / lubricating oil cooling passage 12 is attached to an upper portion of the air-cooled oil cooler 14, and a lower portion of the air-cooled oil cooler 14 is attached to the steering rack mounting bracket 18. With the support structure, the air-cooled oil cooler 14 can be supported from the lower part to form a rigid mounting structure, and the air-cooled oil cooler 14 can be reliably prevented from falling off, and a force can be applied from the front of the vehicle. When the air-cooled oil cooler 14 is actuated, the air-cooled oil cooler 14 can be rotated around the support portion below the air-cooled oil cooler 14, and the force can be dissipated.

Further, by supporting the air-cooled oil cooler 14 so as to be directed obliquely downward in front of the vehicle,
The traveling wind from the front of the vehicle can be captured by the inclined air-cooled oil cooler 14, and the flow of the traveling wind in the obliquely downward direction is ensured.
It is possible to more reliably prevent damage and dropping of the sheet.

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the air-cooled oil cooler 14 is arranged below the radiator 6, but the air-cooled oil cooler 14 is
It is also possible to have a special configuration located rearward.

That is, as shown in FIG.
A cooling fan 32 for taking in the traveling wind
The radiator 6 and the cooling fan 32
The air-cooled oil cooler 14 is provided between them.

Then, the temperature of the cooling water is relatively low between the cooling water and the working / lubricating oil, and the radiator 6 for cooling the relatively low-temperature cooling water is moved forward of the vehicle. And an air-cooled oil cooler 14 for cooling operation / lubricating oil having a relatively high temperature.
Since it is located on the rear side of the vehicle, an efficient cooling state can be secured, which is practically advantageous.

It is also possible to adopt a special configuration in which a traveling wind collecting means for collecting traveling wind and guiding it to the air-cooled oil cooler side is provided.

Then, a large amount of traveling air can be collected and guided by the air-cooled oil cooler, and the cooling efficiency of the air-cooled oil cooler can be improved.

[0044]

As described above in detail, according to the present invention, a water-cooled oil cooler for cooling the operation and lubricating oil of the automatic transmission is provided separately in the cooling water passage connecting the engine and the radiator. In the oil cooler structure of the automatic transmission, an operation / lubrication oil cooling passage is provided to connect the automatic transmission and the water-cooled oil cooler. An air-cooled oil cooler is provided so that the water-cooled oil cooler and the air-cooled oil cooler arranged in series with the working / lubricating oil cooling passage allow the working / lubricating oil to be cooled by a water-cooled oil cooler and air-cooled oil cooler. Cooling can be performed at two points with the oil cooler, and the burden on the radiator can be reduced, which is practically advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a cooling water passage and an operating / lubricating oil cooling passage of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a schematic configuration of an air-cooled oil cooler portion.

FIG. 3 is a front view showing a schematic configuration of a cooling water passage and an operation / lubricating oil cooling passage of the automatic transmission.

FIG. 4 is an enlarged plan view showing a schematic configuration of an air-cooled oil cooler portion.

FIG. 5 is a front view of a steering rack mounting bracket.

FIG. 6 is a plan view of a steering rack mounting bracket.

FIG. 7 is a front view of an oil cooler side bracket.

FIG. 8 is a right side view of the oil cooler side bracket.

FIG. 9 is a schematic layout diagram of an air-cooled oil cooler showing another embodiment of the present invention.

FIG. 10 is a schematic explanatory view of a cooling water passage and an operating / lubricating oil cooling passage of an automatic transmission according to the prior art of the present invention.

[Explanation of symbols]

 2 engine 4 automatic transmission 4a oil outlet 4b oil inlet 6 radiator 8 cooling water passage 10 water-cooled oil cooler 12 operation / lubricating oil cooling passage 12-1 first operation / lubricating oil cooling passage 12-2 second operation / Lubricating oil cooling passage 14 Air-cooled oil cooler 16 Steering rack 18 Steering rack mounting bracket 20 Folding part 22 Hose 24 Oil cooler side bracket

Claims (6)

[Claims] 1. An oil cooler structure for an automatic transmission, wherein a water-cooled oil cooler for operating an automatic transmission and cooling lubricating oil is separately provided in a cooling water passage communicating between an engine and a radiator. A lubricating oil cooling passage is provided to connect the machine and the water-cooled oil cooler.
An oil cooler structure for an automatic transmission, wherein an air-cooled oil cooler is provided in the lubricating oil cooling passage so as to be in series with the water-cooled oil cooler. 2. The oil cooler structure for an automatic transmission according to claim 1, wherein the air-cooled oil cooler is disposed in the middle of the working / lubricating oil cooling passage on the inflow side of the water-cooled oil cooler. 3. The oil cooler structure for an automatic transmission according to claim 1, wherein the air-cooled oil cooler is mounted on a steering rack of a vehicle equipped with an engine using a steering rack mounting bracket. 4. The oil cooler structure for an automatic transmission according to claim 3, wherein the air-cooled oil cooler attached to the steering rack is fastened to a folded portion formed at a tip portion of a steering rack attachment bracket. 5. The automatic transmission according to claim 3, wherein the air-cooled oil cooler has an operating / lubricating oil cooling passage hose attached to an upper portion thereof and a lower portion attached to and supported by a steering rack mounting bracket. Oil cooler structure. 6. The oil cooler structure for an automatic transmission according to claim 5, wherein the air-cooled oil cooler is supported so as to be directed obliquely downward in front of the vehicle.