JPH0245646Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a heat exchanger located between the front wheel and the engine of a two-wheeled vehicle. It relates to a main corrugated fin that is thick and has no louver.

[Prior art and its problems]

Conventionally, as a heat exchanger for a passenger car, a main corrugated fin with a larger fin pitch is provided in a part of the heat exchanger core than in the other part, and the relatively low temperature air passing through the main corrugated fin is guided to the air side of the engine. ,
Proposals have been made to increase engine output by increasing the actual charge air compression ratio.

However, according to the inventor's experiments, if such a heat exchanger is manufactured using conventional fins with only different fin pitches, the heat exchanger may lack vibration resistance, especially for motorcycles. I understand. In other words, in order to improve heat transfer, the corrugated fins are press-fitted between the tubes and fixed by brazing, which creates a pressing force that causes the central portions of both sides of the heat exchanger to bulge out in the shape of a drum. receive. Conventionally, side members on both sides of the heat exchanger have prevented such deformation. However, if a special corrugated fin with a coarser fin pitch is provided in the center of the heat exchanger than in other parts, the fin in that part will have less supporting force to support the tube, and the pressing force of the fins in other parts will decrease. As a result, the central fin becomes deformed and the flat tube to which it is brazed is deformed. Therefore, if the tube is used as a heat exchanger for a motorcycle with initial strain generated in this way, the brazed portion at the base of the tube may crack, causing fluid leakage, or the brazed portion between the fin and tube may crack. Cracking can occur and the tubes may lack integrity, further reducing vibration resistance and the life of the heat exchanger.

[Summary of the idea]

Therefore, the purpose of this invention is to solve the problem of tactility as a heat exchanger for motorcycles, and to dispose corrugated fins with a coarse fin pitch in the center of the heat exchanger to blow away hot air from the engine. The main points are as follows.

That is, the pair of tube plates 1, 1 are arranged apart from each other. Then, both ends of a large number of parallel flat tubes 2 are fixed to each tube plate 1 by penetrating them. Furthermore, the main corrugated fin 3 is pressed into contact with most of the space between the flat tubes 2 and 2 and fixed by brazing. and,
A secondary corrugated fin 4 is press-fitted between the flat tubes 2 at least in the center of the heat exchanger and fixed by brazing. This subordinate corrugated fin 4
are formed into a corrugated shape with a pitch larger than that of the main corrugated fins 3, and are formed thicker than the plate thickness of the main corrugated fins 3. Further, a large number of louvers 5 are formed only on the main corrugated fins 3 so as to be perpendicular to the cooling air flow. These are located between the front wheels and the engine of the two-wheeled vehicle.

[Example of idea]

Next, each embodiment of the present invention will be described based on the drawings.

FIG. 1 is a partially enlarged view of FIG. 2 showing the main parts of the heat exchanger of the present invention. FIG. 2 shows an overall view of the heat exchanger of the present invention, and FIG. 3 is a sectional view taken along the - arrow in FIG. 1.

In this embodiment, as shown in FIG. 2, a large number of flat tubes 2 are arranged parallel to each other and spaced apart between a pair of tube plates 1, 1 which are spaced apart from each other vertically. They are fixed by brazing through each of them. A main corrugated fin 3 is provided in most of the space between the tubes 2, 2. This main corrugated fin is the first
As shown in Figures 2 and 3, a large number of louvers 5 are formed by making cuts in an extremely thin metal plate, and the openings of the louvers 5 are bent so as to face the air flow and are press-fitted between each tube 2. It is what was done. This is because the amplitude of the waves of the main corrugated fins 3 is slightly larger than the distance between the outer surfaces of the flat tubes 2. Therefore, the fins 3 are pushed between the tubes 2, 2. Next, in the center of the heat exchanger, there is disposed a sub-corrugated fin 4 which is thicker than the main corrugated fin described above, has a coarser fin pitch than the main corrugated fin, and has no louvers formed at all. The secondary corrugated fin 4 is bent into a trapezoidal shape as shown in FIGS. 1 and 2, and is pressed between the tubes 2 and fixed by brazing.

FIG. 4 shows the main parts of a second embodiment of the present invention, as seen from the same direction as FIG. 1. In this embodiment as well, the wavy shape of the secondary corrugated fin 4 is bent into a trapezoid, but the opening side thereof is formed narrowly.

Furthermore, FIGS. 5 and 6 are enlarged views of main parts showing the third embodiment of the present invention, and are views seen from the same direction as FIG. 1, and FIG. It is an arrow sectional view.

In this embodiment, as shown in FIG. 5, the waveform of the sub-corrugated fins 4 is rectangular, and the cross-sections parallel to the air flow are each inclined upward.

[Effect of invention]

Next, the operation of the present invention will be explained.

This heat exchanger is assembled as shown in FIG. 8 as an example, and each corrugated fin 3 and 4
is press-fitted and interposed between the respective flat tubes 2, 2, and they are integrally fixed by brazing.
Therefore, the pressing force of each corrugated fin is stacked, and both sides of the heat exchanger receive an external pressure that expands into a drum shape as shown by the chain lines in FIG. The central portion is then subjected to an external force that pushes and bends it into an X-leg shape as shown by the arrow in the figure. However, both sides are supported by side members 9, which are strength members, and the secondary corrugated fins 4 with a rough pitch in the center are thick and made of highly rigid fins without louvers. Balanced by the external force, each flat tube maintains a straight line. The thickness of the flat tube of the embodiment is, for example, about 0.1 to 0.3 mm, the thickness of the main corrugated fin 3 is 0.04 mm, and the thickness of the secondary corrugated fin 4 is 0.8 mm or more. There is.
Such a heat exchanger is disposed between the front wheel 8 of a two-wheeled vehicle and an engine (not shown), as shown in FIG. 7, for example.

In this embodiment, both sides of the engine and above the engine are covered with covers 7. Therefore, when the two-wheeled vehicle runs, the running wind passes through the main heat exchanger. Here, in the center of the heat exchanger, there is formed a part where the fin pitch is rough and there are no louvers, so there is relatively little air resistance and little heat transfer effect. The airflow passing through the area is maintained at a lower temperature than the airflow passing through other parts. Then, the hot air around the outer periphery of the engine and the hot air that rises therefrom and stays at the top of the cover 7 can be blown away. That is, since the air flow has a relatively high flow rate and low temperature, it is possible to prevent hot air from accumulating inside the cover 7. In addition, as shown in Fig. 6, the subordinate corrugated fin 4
If the cover 7 is tilted upward toward the downstream side of the air flow, the hot air above the cover 7 can be blown away more effectively.

[Effect of idea]

As is clear from the above description, the motorcycle heat exchanger of the present invention has the following configuration.

That is, the pair of tube plates 1, 1 are arranged apart from each other. Then, both ends of a large number of parallel flat tubes 2 are fixed to each tube plate 1 by penetrating them. Furthermore, the main corrugated fin 3 is pressed into contact with most of the space between the flat tubes 2 and 2 and fixed by brazing. and,
A secondary corrugated fin 4 is press-fitted between the flat tubes 2 at least in the center of the heat exchanger and fixed by brazing. This subordinate corrugated fin 4
The corrugated fins are formed into a corrugated shape with a pitch larger than that of the main corrugated fins 3, and are also formed thicker than the plate thickness of the main corrugated fins 3. moreover,
A large number of louvers 5 are formed only on the main corrugated fin 3 so as to be perpendicular to the cooling air flow. These are located between the front wheels and the engine of the two-wheeled vehicle.

The heat exchanger for a two-wheeled vehicle according to the present invention has the above structure and has the following effects.

(1) This heat exchanger is provided with secondary corrugated fins 4, which have a pitch larger than that of the main corrugated fins 3 and do not have louvers, at least in the center of the heat exchanger, so that the air flows through the center of the heat exchanger. This cooling airflow has the effect of blowing away the hot air from the engine downstream of the heat exchanger and the hot air rising from the engine. Particularly, in a two-wheeled vehicle having a structure in which the cover fits above the side of the engine as shown in FIG. 7, hot air that tends to accumulate above the cover can be blown away. This has the effect of preventing the aging of various parts that are made of synthetic resin and rubber that make up the motorcycle, as well as preventing the deterioration of oil. Furthermore, it has the effect of lowering the temperature of the air supplied to the carburetor, increasing air density, and increasing engine output.

(2) In this way, even though the pitch of the secondary corrugated fins 4 is made larger than that of the main corrugated fins 3, this part does not lose its vibration resistance. In other words, generally speaking, if the pitch of the corrugated fins is made rougher, the supporting force supporting the tubes to which they are brazed will be reduced, but in this heat exchanger, unlike the main corrugated fins, the secondary corrugated fins 4 are Since there is no louver 5 having a notch and the thickness of the secondary corrugated fin 4 is thicker than that of the main corrugated fin, its rigidity is increased and the tube supporting force is increased. Therefore, even if the pitch of the secondary corrugated fin 4 is rough, the tube supporting force in that area is not impaired.
It is possible to provide a heat exchanger that is vibration resistant and optimal for motorcycles as a whole.

[Brief explanation of the drawing]

FIG. 1 shows the main parts of the heat exchanger according to the first embodiment of the present invention, FIG. 2 is a partially enlarged view, FIG. 2 is an overall view of the heat exchanger, and FIG. 4 is an enlarged view of the main parts of the second embodiment of the present invention,
Fig. 5 is an enlarged view of the main part of the third embodiment, and Fig. 6 is an enlarged view of the main part of the third embodiment.
Fig. 7 is a schematic perspective view showing an example of the heat exchanger mounted on a two-wheeled vehicle, and Fig. 8 is an explanatory diagram of the force applied inside the heat exchanger. 1... Tube plate, 2... Flat tube, 3... Main corrugated fin, 4... Secondary corrugated fin, 5... Louver, 6... Heat exchanger,
7...Cover, 8...Front wheel, 9...Side member.

Claims (1)

[Scope of utility model registration request] A pair of tube plates 1, 1 spaced apart from each other, a number of flat tubes 2 positioned parallel to each other and having both ends fixed through the tube plate 1, and each of the flat tubes 2. , a main corrugated fin 3 which is press-fitted and fixed by brazing to most of the space between the two; A secondary corrugated fin 4 is press-fitted between the tubes 2 and 2 and fixed by brazing, and a louver 5 having a large number of cuts substantially perpendicular to the cooling air flow is attached to the main corrugated fin 3.
For a two-wheeled vehicle, the secondary corrugated fins 4 are formed thicker than the main corrugated fins 3, and these are located between a front wheel and an engine of the two-wheeled vehicle. Heat exchanger.