JP2012061935A - Cooling structure of vehicular heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a vehicular heat exchanger which has high cooling efficiency.SOLUTION: An air intake port 44 provided in a bumper 16 and a weight-reducing hole 28 formed in a first cross member are matched to each other in a front view of a vehicle. Further, their respective positions are arranged so that air flows passing therethrough do not contact lateral edges 35 of the heat exchanger (intercooler 36).

Description

  The present invention relates to a cooling structure for a heat exchanger for a vehicle.

  In general, a large cargo vehicle is provided with a large bumper on the front surface of the vehicle, and a heat exchanger such as a radiator or an intercooler is provided behind the bumper. The heat exchanger is attached to the front surface of an internal combustion engine such as a diesel engine, and the cooling air that is drawn from outside the front surface of the heat exchanger by a fan provided between the heat exchanger and the internal combustion engine is passed through the heat exchanger. Is discharged to the rear of the vehicle through the lower side and side of the engine.

  However, conventional bumpers are appropriately provided with openings for use in terms of design and for footrests, etc., but these openings are formed particularly in association with a heat exchanger provided behind the bumper. It was not.

  The internal combustion engine and the heat exchanger are installed between frames (side frames) provided in the front-rear direction of the vehicle. The internal combustion engine is provided with devices such as a generator, a compressor, or an intake pipe and an exhaust pipe on the front and left and right sides, and the front and rear and the left and right are not equally configured. For this reason, the cooling air does not flow evenly through the upper, lower, left and right sides of the internal combustion engine and flows out to the rear of the vehicle.

  Furthermore, on either the left or right side of the internal combustion engine where the flow resistance is large, the cooling air that has passed through the heat exchanger returns to the front of the heat exchanger through the space between the engine and the side frame, and again passes through the heat exchanger. It has been confirmed. Thus, when the reverse flow of the cooling air occurs, the amount of air passing through the heat exchanger increases, but the temperature of the cooling air passing through increases, and the heat exchanger cannot be efficiently cooled. As a method for avoiding this, for example, the opening area of the front surface of the vehicle is increased, thereby efficiently taking in outside air, reducing the temperature of the cooling air to near the atmospheric temperature, and increasing the amount of air passing through the heat exchanger. It is known to effectively cool the heat exchanger.

JP-A-7-291062

  However, conventionally, the position of the opening provided in the bumper and the position of the hole for weight reduction formed in the cross member have not been provided correspondingly. For this reason, the outside air flowing in from the opening provided in the bumper hits the cross member and may not be smoothly introduced into the heat exchanger.

  In addition, when the outside air introduced from the opening of the bumper hits the left and right edge portions of the heat exchanger, an airflow that flows backward through the outside of the heat exchanger is formed. Then, the amount of air passing through the heat exchanger is reduced and the cooling air that has flowed back between the internal combustion engine and the side frame to the front surface of the heat exchanger and flows backward through the outside of the heat exchanger. There is a collision with the airflow. Then, both air currents were stagnated, resulting in a reduction in the amount of air passing through the heat exchanger, and efficient cooling could not be realized.

  An object of the present invention is to solve the above-mentioned problems and to provide a cooling structure for a vehicle heat exchanger in which a large amount of cooling air passes through the heat exchanger and high cooling efficiency is obtained.

In the present invention, the cooling structure of the vehicle heat exchanger is configured as follows.
The position of the opening provided in the bumper that functions as an air intake is matched with the position of the hole for weight reduction formed in the first cross member. Furthermore, the position of the opening as the air intake of the bumper and the position of the hole for reducing the weight of the first cross member are set so that the air passing through them does not hit the left and right edges of the heat exchanger.

  According to the cooling structure for a vehicle heat exchanger according to the present invention, the position of the opening as the air intake of the bumper and the position of the hole for reducing the weight of the first cross member are matched in front view. The airflow efficiently passes through the bumper and the first cross member, reaches the heat exchanger, and can effectively cool the heat exchanger.

  Further, since the airflow that has passed through both the bumper and the first cross member does not come into contact with the left and right edges of the heat exchanger, no airflow that flows backward through the outer edges of the heat exchanger is generated. Therefore, the airflow does not collide with the reverse flow that is reversed between the internal combustion engine and the side frame and flows forward, and the airflow does not stay. Moreover, after reaching the front surface of the heat exchanger, the backflow air passes through the heat exchanger together with the outside air that has passed through the bumper and the first cross member, and flows out to the rear of the vehicle. Therefore, the cooling air passes through the heat exchanger from the front of the vehicle, and the heat exchanger is efficiently cooled.

It is a front view which shows one Embodiment of the cooling structure of the heat exchanger for vehicles concerning this invention. It is a side view which shows one Embodiment of the cooling structure of the heat exchanger for vehicles shown in FIG. It is a top view which shows one Embodiment of the cooling structure of the heat exchanger for vehicles shown in FIG. It is a plane schematic diagram which shows the cooling effect | action of a heat exchanger. It is a plane schematic diagram showing a comparative example of the cooling action of the heat exchanger. It is a front view which shows a vehicle.

An embodiment of a cooling structure for a vehicle heat exchanger according to the present invention will be described.
FIG. 6 shows the front surface of the vehicle 10 for large cargo. On the front surface of the vehicle 10, a windshield 12, a front panel 14, a bumper 16 as a front bumper, and the like are provided. The bumper 16 is attached to a frame 20 (see FIG. 2) provided behind the bumper 16.

  The frame 20 is a so-called ladder type frame, and is passed in the vehicle width direction between two side frames 22 provided in parallel in the longitudinal direction of the vehicle 10 and the left and right side frames 22 as shown in FIG. It comprises a plurality of cross members (the first cross member 24 is shown in FIG. 3) and the like. The side frame 22 is generally U-shaped in cross section, and has a U-shaped opening surface facing each other, and a first cross member 24 is attached to the tip. Description of other cross members is omitted.

  As shown in FIG. 3, the first cross member 24 is attached to the front end of the side frame 22, and as shown in FIG. 1, holes 28 for weight reduction are formed on the front and left and right at predetermined intervals. One pair is formed. Note that the hole for weight reduction provided in the first cross member 24 may be appropriately provided in addition to the hole 28. The hole 28 is formed in consideration of the strength of the first cross member 24 and the like.

  FIG. 2 shows a front partial side surface inside the vehicle 10. The side frame 22 extends continuously from the rear of the vehicle 10 to the front end of the vehicle 10. A drive mechanism 30 is installed between the left and right side frames 22 as shown in FIGS. The drive mechanism 30 includes an internal combustion engine 32, a radiator 34 as a heat exchanger, an intercooler 36, and the like.

  The internal combustion engine 32 is, for example, a diesel turbocharged engine with an intercooler, and a drive shaft is connected to a rear wheel via a drive shaft (both not shown). The internal combustion engine 32 is not limited to a diesel turbocharged engine with an intercooler. The intercooler 36 and the radiator 34 are attached to the front of the internal combustion engine 32 with the intercooler 36 disposed in front of the radiator 34. The intercooler 36 is provided behind the first cross member 24.

  The radiator 34 passes the cooling water from the internal combustion engine 32, cools the cooling water with cooling air, returns the cooling water whose temperature has decreased to the internal combustion engine 32, and cools the internal combustion engine 32. The intercooler 36 passes hot intake air compressed and compressed by an exhaust supercharger (not shown), cools it with cooling air, lowers the temperature, and sends it out to the intake passage.

  A fan 40 is provided between the heat exchanger such as the intercooler 36 and the internal combustion engine 32. The fan 40 is connected to a drive shaft from the internal combustion engine 32. When operated via the drive shaft, the fan 40 draws outside air or the like from the front of the heat exchanger, and sends the drawn outside air or the like backward.

  As shown in FIG. 6, the bumper 16 is provided with an intake port 44 for taking in air at least at intervals of a license plate (not shown). The bumper 16 is attached to the first cross member 24 via a bracket or the like (not shown) so that the upper edge of the bumper 16 is located slightly below the center of the heat exchanger such as the intercooler 36. . When the fan 40 is operated by the internal combustion engine 32, outside air is introduced as cooling air into the bumper 16 through the intake port 44.

  The intake port 44 formed in the bumper 16 and the weight reduction hole 28 formed in the first cross member 24 are formed at least one place on the left and right with respect to the center of the vehicle 10 and are viewed from the front. Are substantially aligned with each other and are arranged in a line.

  Further, at least the portions of the intake port 44 and the hole 28 that coincide with each other when viewed from the front are provided at positions closer to the inside than the left and right end edges of the narrowest device of the heat exchanger as shown in FIG. ing. That is, the intake port 44 and the hole 28 are provided at positions where the airflow passing therethrough does not hit the left and right end edges 35 of the intercooler 36.

  The positions of the intake port 44 and the hole 28 in the vertical direction with respect to the heat exchanger are not particularly limited as long as an airflow passing through them is provided corresponding to the heat exchanger. Further, the heat exchanger is not limited to the intercooler 36 and the radiator 34. Either one or a combination with other devices may be used.

  Next, the effect | action of the cooling structure of the said heat exchanger is demonstrated.

  FIG. 4 shows a schematic configuration in front of the vehicle 10. Corresponding members are given the same reference numerals. When the internal combustion engine 32 is driven and the cooling water temperature in the internal combustion engine 32 reaches a predetermined value, the cooling water flows through the radiator 34, the fan clutch (not shown) is operated, and the fan 40 rotates. Start. Further, when the operating rotational speed of the internal combustion engine 32 increases, the exhaust supercharger generates a large amount of compressed air, and high-temperature air is sent to the intercooler 36.

  When the fan 40 operates, the fan 40 sucks air from the front surface of the fan 40 and discharges it to the rear. Accordingly, the cooling air passes through the intercooler 36 and the radiator 34 from the front to the rear. Further, it is assumed that the vehicle 10 has a large flow resistance of the airflow on the driver's seat side (upper side in FIGS. 4 and 5) due to the positional relationship between the structure of the drive mechanism 30 and the side frame 22. Then, the wind introduced by the fan 40 passes through the intercooler 36 and the like on the driver side, and then reverses between the side of the internal combustion engine 32 and the side frame 22 to form a forward flow. On the other hand, on the passenger seat side, the cooling air flows smoothly backward.

  Next, the flow of cooling air will be specifically described with reference to FIG. The intake port 44 provided in the bumper 16 and the weight reduction hole 28 provided in the first cross member 24 are located inside the left and right end edges 35 of the intercooler 36 as shown in FIG. . When outside air is drawn in by the fan 40, it passes through the intake 44, reaches the front surface of the intercooler 36 as an air current A and an air current D. Since the intake 44 and the hole 28 are located inside the intercooler 36 and the left and right edges of the radiator 34, the airflow A and the airflow D that have passed through the hole 28 reach the ventilation portion of the intercooler 36. .

  On the driver seat side on the left side when viewed from the front, the airflow A that flows rearward through the side of the internal combustion engine 32 flows to the rear of the vehicle 10 as an airflow F, while between the side frame 22 and the internal combustion engine 32. The airflow B is reversed and travels forward and flows around the front surface of the intercooler 36. As a result, the airflow B that has circulated forward and the airflow A that has passed through the intake port 44 and the hole 28 provided on the driver's vehicle side and reached the front surface of the intercooler 36 are smoothly merged to the rear of the vehicle 10. It becomes the airflow C heading. At that time, by taking in a large amount of airflow A, the pressure difference in the front-rear direction can be relaxed and the airflow B having a high air temperature can be suppressed.

  As a result, a large amount of cooling air at a low temperature passes through the heat exchanger including the radiator 34 and the intercooler 36, and the heat exchanger such as the radiator 34 is efficiently cooled.

  Note that the backflow airflow B is generated on both sides of the internal heat engine 32, but whether the backflow occurs more on the left or right side of the internal heat engine 32 is a matter determined by the structure and layout of the engine.

  FIG. 5 shows a comparative example. In this example, the intake port 44 and the hole 28 coincide with each other when viewed from the front. However, as shown in FIG. 5, they are provided at positions on the left and right end edges 35 of the intercooler 36. Then, the airflow A that has passed through the intake port 44 and the hole 28 hits the edge 35, partly passes through the intercooler 36, and partly flows around the edge 35 and tends to flow rearward of the vehicle 10.

  On the other hand, since a backflow airflow B is formed on the driver's seat side, a part of the airflow A that flows backward collides with the airflow B. Then, the flow of both airflow A and airflow B is hindered. Therefore, the amount of cooling air that passes through does not increase, and a high cooling effect cannot be obtained.

  The present invention is used in a cooling structure for a vehicle heat exchanger.

DESCRIPTION OF SYMBOLS 10 ... Vehicle 16 ... Bumper 20 ... Frame 22 ... Side frame 24 ... Cross member 28 ... Hole 30 ... Drive mechanism 32 ... Internal combustion engine 34 ... Radiator 35 ... Edge 36 ... Intercooler 40 ... Fan 44 ... Inlet

Claims (4)

A pair of left and right side frames provided along the longitudinal direction of the vehicle;
A first cross member attached to the front end of the side frame;
A front bumper provided in front of the first cross member;
An intake for air provided in the front bumper;
A hole for weight reduction provided in the first cross member;
A drive mechanism for the vehicle installed between the side frames and a heat exchanger for cooling the drive mechanism;
A cooling structure for a heat exchanger for a vehicle, wherein the intake port and the hole for weight reduction are provided at positions arranged linearly in a front view of the vehicle.   The intake port and the lightening hole are provided at a position where the airflow that has passed through the intake port and the lightening hole does not contact the left and right edges of the heat exchanger. The cooling structure for a vehicle heat exchanger according to claim 1.   3. The cooling structure for a vehicle heat exchanger according to claim 1, wherein a pair of the intake port and the lightening hole are provided at positions symmetrical with respect to a center of the vehicle. A pair of left and right side frames provided along the longitudinal direction of the vehicle;
A first cross member attached to the front end of the side frame;
A front bumper provided in front of the first cross member;
An intake provided in the front bumper;
A hole for weight reduction provided in the first cross member;
A drive mechanism for the vehicle installed between the side frames and a heat exchanger for cooling the drive mechanism;
The intake and the lightening hole are provided in a linearly continuous position in a front view of the vehicle, and the intake and the lightening hole are provided in the intake and the lightening. The airflow that has passed through the hole is provided at a position that does not contact the edge of the heat exchanger,
In either one of the left and right sides of the internal combustion engine, the cooling air that has passed through the heat exchanger is reversed between the side frame and the internal combustion engine, reaches the front surface of the heat exchanger, and A cooling structure for a vehicle heat exchanger, wherein an airflow that has passed through the intake port and the lightening hole merges with the inverted airflow and flows out to the rear of the internal combustion engine.

Images