JPH11287589A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost through decrease in number of parts and to enhance heat exchanging performance through blocking of introduced air flow by extending a member constituting a tank outward toward the upstream of air flow to form an air flow introducing section. SOLUTION: A radiator cooling a water-cooled internal combustion engine has cooling water tanks 11, 12 disposed on the left and right sides and comprises flat cooling water tubes 13 penetrating the opposite inner wall members of the tanks 11, 12, and corrugate heat radiation fins 14. They are made entirely of aluminum or aluminum alloy. The tanks 11, 12 have running air introducing plates 15, 15 formed integrally at the front edge while being bent forward of the chassis to spread to the left and right. Since the running air introducing plates 15, 15 are not required to be prepared independently, the number of parts and cost are prevented from increasing and the volume of running air to be collected is increased resulting in significant enhancement of cooling capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a simple structure capable of effectively guiding air to a heat radiating portion of a heat exchanger, particularly to a water-cooled internal combustion engine mounted on a small vehicle. Heat exchanger.

[0002]

2. Description of the Related Art In a heat exchanger generally called a radiator used in a water-cooled internal combustion engine mounted on a motorcycle, a conventional heat exchanger has been conventionally used to guide traveling wind to a radiator.
As described in JP-A-8-41621, a pair of side covers is disposed in front of a pair of left and right tanks of the radiator main body, and the side covers are respectively provided by metal fittings and bolts provided on the radiator main body. It is designed to be detachably attached to the radiator body.

[0003]

[PROBLEMS TO BE SOLVED]
In the radiator described in the publication, the side cover for introducing the traveling wind is separate from the radiator main body, and a fixing means for attaching the side cover to the radiator main body is required. Will be high.

[0004] The radiator body and the side cover are
Since it was separate, a gap was formed, and the introduced traveling wind leaked from this gap, making it difficult to obtain a sufficient cooling effect.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an improvement of a heat exchanger which overcomes such difficulties.
The invention according to claim 1 is a heat exchanger comprising a heat radiating portion and a pair of tanks provided at both ends of the heat radiating portion, wherein the members constituting the tank are outwardly directed toward the upstream of the airflow. And the extended portion serves as an air flow introduction portion.

According to the first aspect of the present invention, since the tank body and the introduction portion are integrated as described above, the number of parts is reduced, the cost can be reduced, and the durability is enhanced. Leakage of the airflow introduced from the section is prevented, and sufficiently high heat exchange performance is obtained.

Further, by configuring the invention as described in claim 2, it is possible to configure a tank provided with an introduction portion using only the members forming the tank, further reducing the number of parts and reducing the structure. By promoting simplification, a large cost reduction and weight reduction of the heat exchanger can be achieved.

Further, by configuring the present invention as described in claim 3, a heat exchanger having high watertightness and high durability can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 5 will be described below.

The equipment to be heat-exchanged is a four-stroke cycle (commonly called four-cycle) single-cylinder water-cooled internal combustion engine 1,
The water-cooled internal combustion engine 1 is integrated with a transmission as a power unit and is mounted on a vehicle body of a small motorcycle (not shown, but also a three-wheeled vehicle or a buggy four-wheeled vehicle).

The water-cooled internal combustion engine 1 comprises a left / right split crankcase 2, a cylinder block 3, a cylinder head 4, and a cylinder head cover 5, and a cylinder hole of the cylinder block 3 is provided at the front end of the crankcase 2. The cylinder block 3 is superimposed so that the center axis (not shown) is directed substantially horizontally forward, and the cylinder head 4 and the cylinder head cover 5 are sequentially superimposed in front of the cylinder block 3.
The cylinder block 3, the cylinder head 4, and the cylinder head cover 5 are integrally connected to each other.

Further, radiator support portions 6 and 7 (the left and right sides are inverted in FIG. 2) are integrally provided on the cylinder block 3 at a position close to the cylinder head 4 to the left and right sides. The cooling water passages 8, 9 are formed in the radiator support portions 6, 7, respectively.
Is connected to a cooling water jacket (not shown) formed in the cylinder block 3 and the cylinder head 4, and the other cooling water passage 8 is connected to a suction port of a cooling water pump (not shown). Have been.

Further, a radiator 10 as a heat exchanger for cooling the water-cooled internal combustion engine 1 is directed horizontally to the left and right cooling water tanks 11 and 12 at regular intervals in the vertical direction. Opposing inner wall members 11 of the cooling water tanks 11 and 12
a, a flat cooling water tube 13 penetrating through the cooling water tanks 11, 12 and penetrating the cooling water tanks 11, 12; and a corrugated radiating fin 14 integrally disposed between the upper and lower flat cooling water tubes 13. These are all made of aluminum or aluminum alloy, and both ends 13a of the flat cooling water tube 13 penetrating the opposed inner wall members 11a, 12a of the cooling water tanks 11, 12, as shown in FIG. It is folded back in the pipe expansion direction, and this joint portion and the joint portion between the flat cooling water tube 13 and the corrugated radiating fin 14 are brazed.

In addition, the cooling water tanks 11 and 12 on both the left and right sides
Is composed of opposed inner side walls 11a and 12a and outer side walls 11b and 12b, and a traveling wind introduction plate 15 curved in a direction expanding rightward and leftward toward the front of the vehicle body is integrated with a front edge of the opposed inner side walls 11a and 12a. The opposed inner side walls 11a, 12a are fitted outside the outer side walls 11b, 12b, and are integrally joined by brazing.

The bottom walls 11 of the left and right cooling water tanks 11, 12
The connection sleeves 16 and 17 respectively penetrate and are integrally fitted by brazing to the connection sleeves c and 12c.
The upper and lower halves 16a, 17a and the lower halves 16b, 17b are divided into two parts and are screwed together so as to be removably fitted to each other. As shown in FIG. The upper halves 16a and 17a of the connection sleeves 16 and 17 pass through the holes of
Upper half 16 of connecting sleeves 16 and 17 projecting downward from 18
The lower half portions 16b and 17b of the connection sleeves 16 and 17 are screwed and tightened to the connection sleeves 16 and 17 so that the distance between the left and right connection sleeves 16 and 17 is reduced by the cooling water passages 8 and 7 of the radiator support portions 6 and 7.
The interval is set to be the same as the interval of 9.

Further, lower half portions of the connection sleeves 16, 17
Bolts 19 b and 17 b are fitted to the cooling water passages 8 and 9 of the radiator supports 6 and 7, respectively, in a watertight manner, and penetrated through the mounting plate 18 and screwed to the radiator supports 6 and 7.
Accordingly, the left and right cooling water tanks 11 and 12 of the radiator 10 are firmly attached to the radiator support portions 6 and 7 of the water-cooled internal combustion engine 1.

Further, the right cooling water tank 12
Further, a cap mounting portion 20 is formed integrally, and a cap 21 is detachably fitted to the cap mounting portion 20.

The embodiment shown in FIGS. 1 to 5 is configured as described above, so that the water-cooled internal combustion engine 1 is started, and then the cooling water temperature in the cooling water jacket (not shown) is equal to or higher than a predetermined temperature. , The thermostat (not shown) is opened, and the cooling water in the cooling water system starts to circulate by the cooling water pump (not shown).

When a small motorcycle (not shown) starts traveling, traveling wind flies from the front of the radiator 10 toward the radiator 10 and passes through a heat radiating portion composed of a flat cooling water tube 13 and a corrugated heat radiating fin 14. The cooling water heated to a high temperature in the cooling water jacket of the water-cooled internal combustion engine 1 and flowing into the right cooling water tank 12 flows through the flat cooling water tube 13 to the left while The heat radiating section exchanges heat with the traveling wind and is cooled. The cooling water cooled in the flat cooling water tube 13 and flowing into the left cooling water tank 11 flows into a suction port of a cooling water pump (not shown), and after being pressurized by the cooling water pump, a water-cooled internal combustion engine is formed. 1
Return to the cooling water jacket (not shown).

Further, in the radiator 10, a pair of left and right traveling wind introduction plates 15 extending left and right are provided integrally with the left and right cooling water tanks 11 and 12 toward the front of the vehicle body. The collection amount of the traveling wind is increased by the front projection area of the traveling wind introduction plate 15, and the cooling capacity of the radiator 10 can be greatly improved.

Further, since the traveling wind introduction plate 15 is formed integrally with the opposed inner side walls 11a and 12a, there is no need to separately prepare the traveling wind introduction plate 15, and the number of parts and man-hours are reduced. An increase is avoided, and a cost increase is avoided.

Moreover, since the flat cooling water tube 13 is flat along the traveling direction, the traveling ventilation resistance passing through the radiator 10 is small, and the corrugated radiating fin 14
The heat exchange performance is extremely high because of its large surface area.

Further, since the radiator 10 is arranged adjacent to the cooling water jacket of the water-cooled internal combustion engine 1, the flow passage of the cooling water system is shortened, the cooling water system is simplified, and the load of the cooling water pump is reduced. This makes it possible to reduce the size and weight of the cooling water pump and to improve the fuel efficiency of the water-cooled internal combustion engine 1.

Further, since the bottom walls 11c, 12c of the pair of left and right cooling water tanks 11, 12 are integrally connected via the connection sleeves 15, 16, the strength and rigidity of the entire radiator 10 are increased. Also, the cooling water passages 8 of the radiator support parts 6, 7
The connection of the connection sleeves 15 and 16 to the
Eligibly secured by

Further, the cylinder block 3 of the water-cooled internal combustion engine 1 is made of die-casting having high rigidity, and the cooling water tanks 11 and 12 of the radiator 10 are provided above the cylinder block 3 with connection sleeves 15 and 16. Since the radiator 10 is firmly mounted by the mounting plate 17 and the bolts 18, the strength and rigidity of the entire radiator 10 are further increased.

The radiator 10 does not require a conventional mounting frame surrounding the outer periphery of the radiator 10. Therefore, the entire radiator 10 is reduced in size and weight, and the number of parts and the number of assembling steps are reduced. Cost reduction becomes possible.

Furthermore, since the cap mounting portion 20 is provided in the cooling water tank 12 on the right side, if the cap 21 is removed from the cap mounting portion 20, the radiator 10 can be easily filled or refilled with the cooling water. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a water-cooled internal combustion engine provided with a heat exchanger of the present invention.

FIG. 2 illustrates one embodiment of the heat exchanger illustrated in FIG.
FIG. 2 is a front view as viewed in the direction of the arrow II.

FIG. 3 is a plan view as viewed in the direction of the arrow III in FIG. 1;

FIG. 4 is a cross-sectional view cut along the line IV-IV of FIG. 2;

FIG. 5 is a perspective view of the embodiment shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water-cooled internal combustion engine, 2 ... Crank case, 3 ... Cylinder block, 4 ... Cylinder head, 5 ... Cylinder head cover, 6, 7 ... Radiator support part, 8, 9 ... Cooling water passage, 10 ... Radiator, 11, 12 ... cooling water tank, 13 ... flat cooling water tube, 14 ... corrugated radiator fins, 15 ... traveling wind introduction plate, 16, 17 ... connection sleeve, 18 ... mounting plate, 19 ...
Bolt, 20… Cap mounting part, 21… Cap.

Claims (3)

[Claims] 1. A heat exchanger comprising a heat radiating portion and a pair of tanks provided at both ends of the heat radiating portion, wherein a member constituting the tank extends outward toward an upstream of an air flow. A heat exchanger, wherein the extension portion serves as an air flow introduction portion. 2. The tank according to claim 1, wherein the tank includes an inner member to which the heat radiating portion is attached, and an outer member formed to face the inner member. The heat exchanger according to claim 1, wherein the heat exchanger is formed. 3. A member which is fitted outside of one of the two members constituting the tank and the other of which is brazed to the fitted portion, and which is the outer member. The heat exchanger according to claim 2, wherein the introduction portion is formed in the heat exchanger.