WO2017090395A1

WO2017090395A1 - Cooling device for vehicles

Info

Publication number: WO2017090395A1
Application number: PCT/JP2016/082538
Authority: WO
Inventors: 健治大隅; 聖統清松
Original assignee: いすゞ自動車株式会社
Priority date: 2015-11-27
Filing date: 2016-11-02
Publication date: 2017-06-01
Also published as: JP2017095049A

Abstract

The present invention relates to a cooling device (1) for vehicles, which is provided with: a heat exchanger (20) that cools a refrigerant by means of an airstream generated through motion; a fan (30) that is disposed in the rear of the heat exchanger (20); a fan cover (40); and a shroud (50) that guides, to the fan, the air (F) passing through a core (21) of the heat exchanger (20), wherein the front lower end of the fan cover (40) is disposed at a position above the lower end of a rear surface of the core (21), and the heat exchanger (20) is disposed at a slant so as to cause the lower end of the rear surface of the core (21) to be positioned in front of the upper end of the rear surface thereof by a prescribed distance, and a guide part (51) having a curved surface shape so as to allow the lower end portion of the rear surface of the core (21) to be connected smoothly with the front lower end portion of the fan cover (40) is provided to a lower end section (50a) of the shroud (50).

Description

Vehicle cooling system

The present disclosure relates to a vehicle cooling device including a heat exchanger.

Generally, a vehicular cooling device includes a radiator that cools engine cooling water with traveling wind, a fan that is provided behind the radiator, and a fan cover that surrounds an outer diameter portion of the fan. A shroud is provided between the radiator and the fan cover to define a ventilation space for guiding the air that has passed through the radiator core to the fan.

Japanese Unexamined Patent Publication No. 2014-9636

In the above configuration, when the front end and the lower end of the fan cover are located above the lower end of the rear surface of the core and the distance between the radiator and the fan is narrow, the air that has passed through the lower end of the core collides with the lower end of the shroud. In addition, smooth air flow is impeded. Therefore, there is a possibility that problems such as a decrease in the amount of passing air flowing from the core to the fan, a decrease in the cooling performance of the radiator, and a deterioration in the fuel consumption of the engine may occur.

The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a vehicular cooling device that can smoothly guide air that has passed through the lower end of a radiator core to a fan.

A vehicular cooling device according to the present disclosure includes a heat exchanger that cools a refrigerant by traveling wind, a fan provided behind the heat exchanger, a fan cover that surrounds an outer diameter portion of the fan, A shroud provided between the heat exchanger and the fan cover and defining a ventilation space for guiding the air that has passed through the core of the heat exchanger to the fan, and a front end and an upper end of the fan cover Is disposed at a height position equivalent to the upper end of the rear surface of the core, the front end and the lower end of the fan cover are disposed above the lower end of the rear surface of the core, and the lower end of the rear surface of the core is predetermined from the upper end of the rear surface. The heat exchanger is inclined so as to be positioned at a distance forward, and a curved guide portion that smoothly connects the lower end portion of the rear surface of the core and the lower end portion of the front end of the fan cover to the lower end portion of the shroud. The And wherein the digit.

The front end of the shroud is attached to the heat exchanger along the outer peripheral edge of the core, and the rear end of the shroud is connected to the front end of the fan cover.

Further, the vehicle cooling device is provided in a cab-over type vehicle, and an upper end portion of the heat exchanger is disposed immediately after a floor panel of the cab of the vehicle.

The fan cover has a first length in the front-rear direction, and the distance in the front-rear direction between the front end of the upper end portion of the shroud and the rear end of the upper end portion of the shroud is the first length. The distance in the front-rear direction between the front end of the lower end portion of the shroud and the rear end of the lower end portion of the shroud is longer than the first length.

The vehicle cooling device according to the present disclosure exhibits an excellent effect that the air that has passed through the lower end of the core of the radiator can be smoothly guided to the fan.

FIG. 1 is an overall configuration diagram of a vehicular cooling device according to an embodiment of the present disclosure. FIG. 2 is a side view of the vehicle cooling device of FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is an overall configuration diagram of a conventional vehicle cooling device. 5 is a cross-sectional view taken along the line VV of FIG. FIG. 6 is a side view of a vehicle cooling device according to another embodiment of the present disclosure.

Hereinafter, a vehicle cooling device according to an embodiment of the present disclosure will be described based on the accompanying drawings. Note that front, rear, left and right in the embodiments described later are based on the traveling direction of the vehicle. For example, the front is the front in the vehicle direction, and the rear is the rear in the vehicle direction. In the present embodiment, the vehicle (not shown) is a cab over type truck.

FIG. 1 shows the overall configuration of the vehicular cooling device 1 according to the present embodiment from an oblique front, and FIG. 2 shows the left side surface of the vehicular cooling device 1. FIG. 3 shows a III-III cross section of FIG.

1 and 2, reference numeral 10 indicates a pair of left and right side members extending in the vehicle front-rear direction, and reference numeral 11 indicates a cross member spanned in the vehicle width direction at the front ends of the left and right side members 10. . The left and right side members 10 are made of channel steel having a U-shaped cross section, and are arranged in parallel so that the grooves face each other. The cross member 11 is also made of channel steel having a U-shaped cross section, and a plurality of vent holes 12 are formed on the front surface portion.

Numeral E indicates an engine provided below the rear portion of the cab (not shown). Inside the engine E, an engine internal water channel (not shown) through which engine cooling water flows is provided.

The vehicle cooling device 1 is disposed between the left and right side members 10 and between the cross member 11 and the engine E.

The vehicular cooling device 1 surrounds a radiator (heat exchanger) 20 that cools engine coolant (refrigerant) with traveling wind, a fan 30 provided behind the radiator 20, and an outer diameter portion of the fan 30. And a fan cover 40. A shroud 50 is provided between the radiator 20 and the fan cover 40.

The radiator 20 includes a core 21, an inflow side tank 22 provided at the upper end portion of the core 21 in the vehicle width direction, and a discharge side provided at the lower end portion of the core 21 in the vehicle width direction. A tank 23. Plates 24 that extend in the vertical direction and connect the inflow side tank 22 and the discharge side tank 23 are respectively provided at the left and right ends of the core 21.

In the present embodiment, the radiator 20 is disposed so as to be inclined (rearly inclined) with respect to the vertical direction so that the lower end of the rear surface of the core 21 is positioned a predetermined distance ahead of the upper end of the rear surface. The predetermined distance here will be described later.

The core 21 is formed in the shape of a square plate as a whole, and a plurality of tubes (not shown) for circulating engine cooling water from the inflow side tank 22 to the discharge side tank 23 and a plurality of heat radiations provided between adjacent tubes. Fins (not shown).

The inflow side tank 22 and the engine E are connected by a first hose 25 that sends engine cooling water from the water passage in the engine to the radiator 20. Moreover, the discharge side tank 23 and the engine E are connected by the 2nd hose 26 which returns an engine cooling water from the radiator 20 to an engine internal water channel.

On the rear surface of the inflow side tank 22, an inlet 27 is provided that is connected to the first hose 25 and allows the engine coolant to flow into the inflow side tank 22. In addition, an outlet 28 for discharging the engine coolant from the discharge side tank 23 is provided on the rear surface of the discharge side tank 23, connected to the second hose 26.

The left and right plates 24 have a first bracket 24a provided on the outer side surface in the vehicle width direction and a second bracket 24b provided on the front surface of the lower end. The first bracket 24 a is connected to the upper end surface of the side member 10. Further, the second bracket 24 b is connected to a coupling mechanism 11 a extending rearward from the lower end surface of the cross member 11. These connecting portions are fixed to each other by a fastening member such as a bolt.

The fan 30 is an axial flow fan or a diagonal flow fan, and includes a rotary shaft 31 extending in the front-rear direction and a blade member 32 connected to the front end of the rotary shaft 31 as shown in FIG. The rotary shaft 31 is connected to, for example, a crankshaft (not shown) of the engine E, and is rotationally driven by the driving force of the engine E.

The fan cover 40 is a ring-shaped member that opens in the front-rear direction. In the fan cover 40 of the present embodiment, the front end and the upper end thereof are disposed at a height position equivalent to the upper end of the rear surface of the core 21 of the radiator 20, and the front end and the lower end are higher than the lower end of the rear surface of the core 21. Placed in position.

The shroud 50 is a member that partitions and forms a ventilation space for guiding the air that has passed through the core 21 of the radiator 20 to the fan 30. The front end of the shroud 50 is attached to the rear surface of the radiator 20 along the square outer peripheral edge 21 e of the core 21, and the rear end of the shroud 50 is connected to the circular front end of the fan cover 40.

In a state where the shroud 50 is connected to the rear surface of the radiator 20 and the front end of the fan cover 40, the lower end portion 50a of the shroud 50 is disposed at a position where the rear end is higher than the front end. Moreover, since the space | interval of the rear surface upper end of the core 21, and the front end of the fan cover 40 and an upper end is narrow, the length of the front-end direction of the upper end part 50b of the shroud 50 is formed very short.

Here, in the present embodiment, the radiator 20 is arranged to be inclined with respect to the vertical direction so that the lower end of the rear surface of the core 21 is positioned a predetermined distance ahead of the upper end of the rear surface. Therefore, the lower end portion 50a of the shroud 50 is formed longer in the front-rear direction by the predetermined distance.

Then, the lower end portion of the core 21 and the lower end portion of the front end of the fan cover 40 are smoothly connected to the lower end portion 50a so that the air that has passed through the lower end portion of the core 21 does not substantially collide with the lower end portion 50a. A curved guide 51 is provided.

That is, the predetermined distance referred to here is a distance at which the air that has passed through the lower end of the core 21 is smoothly guided by the guide 51 without substantially colliding with the lower end 50a of the shroud 50. means.

Although details will be described later, the term “substantial collision” as used herein means that the air that has passed through the lower end of the core 21 collides with the inner wall surface of the shroud 50 substantially perpendicularly or remarkably, so that the air smoothly It refers to the state where the slow flow is inhibited.

Next, the function and effect of the vehicle cooling device 1 of the present embodiment will be described with reference to FIGS. FIG. 4 is a diagram showing the entire configuration of the conventional vehicle cooling device 1 from an oblique front, and FIG. 5 is a cross-sectional view taken along line VV of FIG. Moreover, in FIG. 3 and FIG. 5, the arrow F shows the flow of the air which passed the lower end part of the core of a radiator. Moreover, the code | symbol P shows the floor panel arrange | positioned at the lower end of a cab, and the code | symbol Q shows the standing part formed in the intermediate part of the front-back direction of the floor panel P. As shown in FIG.

In the present embodiment, as shown in FIG. 3, the radiator 20 is inclined with respect to the vertical direction so that the lower end of the rear surface of the core 21 is positioned a predetermined distance ahead of the upper end of the rear surface. Therefore, in the shroud 50, the lower end portion 50a can be formed longer in the front-rear direction by the predetermined distance.

In the present embodiment, by forming the shroud 50 in this manner, the curved guide portion 51 that smoothly connects the lower end of the rear surface of the core 21 and the lower end of the front end of the fan cover 40 to the lower end 50a. Can be provided.

Here, the flow of air at the lower end 50a provided with the guide 51 will be considered in comparison with a conventional example that does not have the guide 51.

As shown in FIGS. 4 and 5, in the conventional vehicle cooling device 1 ′, the rear end of the lower end 50 a ′ of the shroud 50 ′ is higher than the front end, as in the present embodiment, The upper end portion 50b ′ of the shroud 50 ′ is formed short in the front-rear direction.

On the other hand, the radiator 20 ′ is slightly inclined to the rear with respect to the vertical direction, but is arranged so that the lower end of the rear surface of the core 21 ′ is positioned in front of the upper end of the rear surface by a predetermined distance in the above-described sense. Not. Therefore, unlike the present embodiment, the lower end 50a 'of the shroud 50' is formed to be short like the upper end 50b '. The curved guide portion 51 as in the present embodiment cannot be provided on the lower end portion 50a 'formed in such a short manner. Therefore, the shape of the lower end portion 50a 'is a shape (face-to-face shape) that rapidly bends upward as it goes rearward. Therefore, a facing portion 51 ′ that faces the core 21 ′ of the radiator 20 ′ is formed at the lower end portion 50 a ′, and a dead space is formed in front of the facing portion 51 ′.

Since the air F that has passed through the lower end of the core 21 ′ collides with the facing portion 51 ′ substantially vertically, the smooth flow of the air F is hindered. Further, the air after the collision tends to stay in the dead space. As a result, the amount of air passing through the core 21 'decreases, the amount of air passing through the core 21' from the fan 30 decreases, the cooling performance of the radiator 20 'decreases, and problems such as deterioration of the fuel consumption of the engine may occur. .

In contrast, in the present embodiment, by providing the curved guide 51, the air F that has passed through the lower end of the core 21 of the radiator 20 substantially collides with the lower end 50a of the shroud 50. It is possible to smoothly lead to the fan 30 without any problem.

This makes it possible to increase the amount of air passing through the core 21, thereby improving the cooling performance of the radiator 20 and improving the fuel efficiency of the engine E.

Incidentally, in this conventional example, if the entire radiator 20 ′ can be moved forward, a curved guide portion can be provided at the lower end portion 50 a ′ of the shroud 50 ′ as in the present embodiment. However, for example, as shown in FIG. 5, if the upper end portion of the radiator 20 ′ is disposed at a position immediately after the floor panel P (in this case, the rising portion Q), the radiator 20 ′ is restricted by the floor panel P. 'The whole thing cannot be moved forward.

Therefore, in the present embodiment, the position of the upper end of the radiator 20 is the same, and the length of the lower end 50a in the front-rear direction is increased by rotating at the upper end fulcrum so that only the lower end is moved forward, and The above-mentioned problem is solved by reducing the height difference at the lower end of the shroud.

Therefore, this embodiment is advantageous when the entire radiator cannot be moved forward.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention.

For example, in the present embodiment, only the radiator 20 is used as a heat exchanger, but as shown in FIG. 6, a configuration in which an intercooler 70 is disposed on the front surface of the radiator 20 may be used.

This application is based on a Japanese patent application (Japanese Patent Application No. 2015-231829) filed on November 27, 2015, the contents of which are incorporated herein by reference.

The present invention has an effect that air that has passed through the lower end of the core of the radiator can be smoothly guided to the fan, and is useful for a vehicle cooling device or the like.

1 Vehicle cooling device 20 Radiator (heat exchanger)
21 core 30 fan 40 fan cover 50 shroud 50a lower end 51 guide

Claims

A heat exchanger that cools the refrigerant by running wind;
A fan provided behind the heat exchanger;
A fan cover surrounding an outer diameter portion of the fan;
A shroud provided between the heat exchanger and the fan cover and defining a ventilation space for guiding the air that has passed through the core of the heat exchanger to the fan, and
The front end and upper end of the fan cover are arranged at a height position equivalent to the upper end of the rear surface of the core,
The front end and the lower end of the fan cover are arranged at a position above the lower end of the rear surface of the core,
The heat exchanger is inclined and arranged so that the lower end of the rear surface of the core is positioned a predetermined distance ahead of the upper end of the rear surface,
A vehicular cooling device, wherein a curved guide portion that smoothly connects a rear lower end portion of the core and a front end lower end portion of the fan cover is provided at a lower end portion of the shroud.
A front end of the shroud is attached to the heat exchanger along an outer peripheral edge of the core;
The vehicle cooling device according to claim 1, wherein a rear end of the shroud is connected to a front end of the fan cover.
The vehicle cooling device is provided in a cab-over type vehicle,
The vehicle cooling device according to claim 1, wherein an upper end portion of the heat exchanger is disposed at a position immediately after a floor panel of the cab of the vehicle.
The fan cover has a first length in the front-rear direction;
The distance in the front-rear direction between the front end of the upper end portion of the shroud and the rear end of the upper end portion of the shroud is shorter than the first length,
The distance in the front-rear direction between the front end of the lower end portion of the shroud and the rear end of the lower end portion of the shroud is longer than the first length.
The vehicle cooling device according to claim 1.