JPH0461276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a heat exchanger for dissipating heat, such as a radiator or an oil cooler, which is disposed in the front part of a motorcycle engine.

BACKGROUND ART Recently, in motorcycles mainly used for on-road use, a heat exchanger A for cooling, such as a radiator or an oil cooler, is often located in front of the engine E, as shown in Fig. 5. installed in position. In general, such a heat exchanger A has corrugated fins for heat dissipation interposed between flat tubes arranged substantially in parallel.

Problems to be Solved by the Invention However, in the conventional heat exchanger as described above, the air heated by heat exchange with the heat exchanger medium in the tube passes through the core of the heat exchanger. This corresponds to the engine located directly behind it. This posed a problem in that the air cooling effect of the engine was reduced.

In addition, in order to solve these problems, we have recently developed a new engine as shown in Figure 6 (this figure shows the arrangement relationship between the heat exchanger and the engine as viewed from the front side of the vehicle).
As shown in , it is divided into two heat exchangers A ₁ and A ₂ ,
Attempts have been made to arrange these on the left and right sides of the engine E, avoiding the front position, so that the cold outside air directly hits the engine E without passing through the heat exchangers A ₁ and A ₂ .

However, with this split method, there are two independent heat exchangers, which not only increases the overall cost, but also creates new problems such as the complexity of the piping system. do.

Therefore, the present invention was made for the purpose of providing a heat exchanger that can directly apply cold air to the engine even though it is a single heat exchanger and is installed in front of the engine. be.

Means for Solving the Problems This invention corresponds to the embodiments and is shown in FIGS. 1 to 5.
As shown in the figure, this is a heat exchanger installed in the front part of the engine E of a motorcycle, in which a plurality of flat tubes 1 arranged in parallel form a tank part 2 provided at both ends. In a heat exchanger in which corrugated fins 3 for heat dissipation are interposed between adjacent tubes 1 and 1, and the tubes 1 and 1 are connected to each other through A finless region (a) in which no corrugated fins 3 are disposed between adjacent tubes is formed, and therefore two effective heat exchanger regions (b) and (b) having corrugated fins 3 only on both sides thereof are formed. In addition, in the finless region A, the adjacent tubes 1, 1
It is characterized in that one or more spacers 4 are partially provided between them.

Function The above heat exchanger is installed in the front part of the engine E of a motorcycle and used as a radiator or oil cooler, but in such an installed state, the heat exchange medium such as engine cooling water or oil is While flowing through the tube 1 from the tank section 2 at the other end to the tank section 2 at the other end, it is cooled by a heat exchanger with the cooling air flowing between the tubes 1 and 1. Moreover, this heat exchange action is carried out exclusively in the effective heat exchanger regions B and B at the ends of the region where the corrugated fins 3 are attached, and the temperature of the cooling air is hardly raised in the finless material stomach region A. pass. Therefore, the engine E located behind the finless region A is directly exposed to low-temperature cooling air, thereby enhancing the engine cooling effect.

Embodiment The embodiment shown in FIGS. 1 to 4 is a heat exchanger suitably used as a radiator or oil cooler for a motorcycle, and is constructed as a laminated type. That is, a plurality of flat tubes 1 each having a tank portion 2 formed in a bulging shape at both ends of the flat tube portion 5 are laminated in multiple stages as appropriate through corrugated fins 3 at desired locations between them, and are integrated. It is made into an integrated unit. As shown in FIG. 3, each of the tubes 1 is constructed by making two molded plates 1a, 1a face each other and joining their peripheral edges. The tank parts 2, 2 are connected to each other with their communication holes 6 aligned, so that they communicate with each other. At the upper ends of the tank portion 2 at both ends, inlets and outlets 7 and 8 for a heat exchange medium such as cooling water are provided, respectively, projecting upward.

In the heat exchanger having the basic configuration as described above, in the present invention, the corrugated fins 3 are not arranged between the adjacent tubes 1 over a predetermined length range of the intermediate portion in the length direction of the tube 1. A finless region portion A is formed. Therefore, the effective heat exchange areas (b) and (b) having the corrugated fins 3 are provided only at both ends of the heat exchanger core, that is, between the finless area (a) and the tank parts 2, 2 at both ends. What is done and what is done. In the finless region A, instead of the fin 3, the adjacent tubes 1 and 1
In between, one or more spacers 4 are provided in a partial arrangement that does not impede the free flow of cooling air as much as possible. This spacer 4 in the embodiment has convex portions 4a, 4a formed in advance in an outwardly bulging shape by press molding on molded plates 1a, 1a, which are the constituent materials of the tubes 1, on each of the adjacent tubes 1, 1. It is formed by facing each other with their butts and joining them in a butt-like manner. This spacer 4 is formed into a molded plate 1 by Boulaging when assembling the heat exchanger.
It functions effectively to ensure the mutual bonding of a and 1a by applying sufficient pressure even in the finless region A, and at the same time, it is useful for preventing deformation of the finless region A of the tube 1. be. Note that an inner fin (not shown) may be loaded into the tube 1 in the effective heat exchange area B, if necessary. In addition, 9 in the figure indicates a mounting stay.

The above-mentioned heat exchanger is installed as a radiator or oil cooler for a motorcycle, centered at the front position of the engine E, as shown in FIG. A heat exchange medium such as engine cooling water or oil that flows into the tube 1 through the tank parts 2 and 2 is cooled by heat exchange with external cooling air that flows between the tubes 1 and 1. . However, this heat exchange effect is mainly performed actively in the effective heat exchange areas (b) and (b) to which the corrugated fins 3 are attached, and no effective heat exchange is performed in the finless area (a). Therefore, the cooling air passing through the finless area A is not heated much, passes through the heat exchanger in a cold state, and directly hits the engine E located at the rear, achieving an efficient engine air cooling effect. . Fourth
In the figure, arrows X indicate the airflow that flows through the effective heat exchange areas B and B and is heated, and arrow Y indicates the airflow that flows through the finless section A and is blown onto the engine E with almost no temperature rise. It is.

Note that the present invention can be applied not only to the laminated heat exchanger as shown in the embodiments of the drawings, but also to those in which the tube 1 is formed by a roll bonding method or an extruded flat tube. It is something. In the case of these variants, spacer 4
may be prepared separately from the tube and interposed between adjacent tubes. Furthermore, in the same embodiment, the tube 1 is arranged horizontally,
Although shown as a horizontal type with tank parts 2, 2 provided on the left and right, it may be a vertical type with the tubes arranged vertically and tank parts provided above and below.

Effects of the Invention As explained above, the motorcycle heat exchanger according to the present invention has a finless region over a predetermined length range in the middle part in the length direction of the tube, and has corrugated fins for effective heat exchange. By taking technical measures to limit the heat exchanger area to both ends of the heat exchanger, the heat exchanger can be placed in the center behind the heat exchanger without impairing its necessary heat exchange function. The cold air passing through the finless region with almost no temperature increase can be directly blown onto the engine and other equipment requiring air cooling, thereby achieving an effective air cooling effect. Of course, since the heat exchanger of this invention is manufactured as a whole as a single structure, the two heat exchangers can be installed in front of the engine using the two-part method that has been tried in the past. Compared to the case where the device is installed at a different location, manufacturing costs can be significantly reduced, and the connection piping configuration can be made simpler.
Further, by partially interposing one or more spacers between adjacent tubes in the finless region,
When assembling and manufacturing the heat exchanger, there is no fear that the tubes will be deformed or the joints will become uncertain, and manufacturing is as easy as conventional products.
It has advantages such as not being particularly expensive compared to single-type conventional products.

[Brief explanation of the drawing]

FIG. 1 is a front view of a motorcycle heat exchanger showing a preferred embodiment of the present invention, and FIG.
FIG. 3 is a partial sectional view taken along the line shown in FIG. FIG. 5 is a schematic perspective view showing how a conventional heat exchanger is installed on a motorcycle, and FIG. 6 is a schematic front view showing how another modified conventional product is used. 1...Tube, 2...Tank part, 3...Corrugated fin, 5...Flat tube part, 6...Communication hole,
A...Finless area part, B...Effective heat exchange area part.

Claims (1)

[Scope of Claims] 1. A heat exchanger disposed in the front part of a motorcycle engine, in which a plurality of flat tubes arranged in parallel are connected via tank parts provided at both ends. In a heat exchanger in which adjacent tubes are connected to each other and corrugated fins for heat dissipation are interposed between adjacent tubes, there is a connection between adjacent tubes over a predetermined length range in a longitudinally intermediate portion of the tubes. A finless region without corrugated fins is formed, and two effective heat exchange regions having corrugated fins only on both sides are formed in a separated state, and in this finless region, there is no interference between adjacent tubes. A heat exchanger for a motorcycle, characterized in that one or more spacers are partially provided in the heat exchanger. 2. Each tube has two molded plates facing each other and their peripheral edges joined to form a tank portion at both ends of the flat tube portion, and
Claim 1, wherein the spacer in the finless region is formed by a pair of opposing convex portions bulging outward from the molded plate.
Heat exchanger for motorcycles as described in Section 1.