JPH0731014B2 - Radiator structure for saddle type vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radiator structure for a saddle-ride type vehicle such as a motorcycle.

(Prior Art) A saddle-ride type vehicle is conventionally disclosed in Japanese Utility Model Laid-Open No. 62-29557.

According to this, the vehicle body frame of the vehicle has the steering shaft tube at the front end thereof, and the main frame extends rearward and downward from the steering shaft tube. An engine is supported on the vehicle body frame below the main frame, and a radiator is provided between the lower surface of the front portion of the main frame and the engine. The core of this radiator is composed of a large number of tubes through which cooling water flows, and fins mounted at a predetermined pitch between these tubes.

Then, while the vehicle is traveling, the traveling wind passes through the gap between the tube and the fins, heat is exchanged between the cooling water flowing in the tube and the traveling wind, and the cooling water is cooled. The engine is cooled by this cooling water.

(Problems to be Solved by the Invention) By the way, in the above-described conventional configuration, the upper portion of the radiator is close to the lower surface side of the main frame, and the lower portion of the radiator is close to the engine.

Therefore, the traveling wind coming from the front of the vehicle toward the radiator is affected by the front portion of the main frame and the engine, and is prevented from passing through the upper and lower portions of the radiator. Trying to pass more through the midway between the upper and lower parts.

If the traveling wind biases the radiator in such a manner, the efficiency of heat exchange by the radiator may decrease and cooling water may be insufficiently cooled.

Further, it is desired to reduce the weight of the radiator in order to reduce the weight of the vehicle while improving the efficiency of heat exchange of the radiator.

(Object of the Invention) The present invention has been made by paying attention to the above-mentioned circumstances, and prevents running wind from drifting to the radiator.
It is intended to improve the efficiency of heat exchange in a radiator and to reduce the weight of the radiator.

(Structure of the Invention) A feature of the present invention for achieving the above-mentioned object is to provide a main frame extending rearward and downward from a steering shaft tube provided at a front end of a vehicle body frame, and below the main frame. An engine is supported on the vehicle body frame, a radiator is provided between the front lower surface of the main frame and the engine, and a core of the radiator is provided with a large number of tubes for circulating cooling water and at a predetermined pitch between these tubes. In a radiator structure of a saddle-ride type vehicle that is configured with fins to be attached, and the same core is configured with a front core and a rear core, the vertical dimension of the rear core is smaller than the vertical dimension of the front core. Also, the rear core is integrally molded on the rear surface of the middle part between the upper and lower parts of the front core, and the fin pitches in the upper and lower parts of the front core are the same as those in the front part. (A) It is smaller than the fin pitches of the mid-section and the rear core, and the mid-section of the front core and the fin pitch of the rear core are different from each other.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a motorcycle, which is a saddle-ride type vehicle. A steering shaft tube 3 is provided at a front end of a vehicle body frame 2, and a front fork 4 is supported on the steering shaft tube 3. A front wheel 5 is supported on the lower end of the front fork 4, and a handle 7 is attached to the upper end thereof.

On the other hand, a rear arm 8 is pivotally supported on the rear portion of the vehicle body frame 2 so as to be vertically swingable, and a rear wheel 9 is supported on a swing end of the rear arm 8. Then, the rear wheel 9 is driven by the engine 10 supported by the vehicle body frame 2. 11 is a fuel tank and 12 is a seat.

The vehicle body frame 2 connects the steering shaft tube 3 and the pivotal support portion of the rear arm 8 to a rear-down shape main frame 14, and connects the midway portion of the main frame 14 and the rear end portion of the main frame 14 to the lower side. Consists of a down tube 15 that curves toward
The engine 10 has these main frames 14 and down tubes.
Supported between 15 and.

A carburetor 16 is connected to the intake port of the engine 10 in front of the engine 10, and a carburetor cover 17 that covers the upper portion of the carburetor 16 is provided.

The main frame is located in front of the engine 10 and the carburetor 16.
A radiator 18 is provided between the underside of the front part of 14 and the engine 10.
The radiator 18 is attached to the vehicle body frame 2. The radiator 18 circulates the cooling water C after the engine 10 is cooled, and during this circulation, it is cooled by traveling wind (reference numeral W in the drawing).

The radiator 18 will be described with reference to FIGS. 2 to 4.

The radiator 18 is a cross-flow type and has a right side tank 20 and a left side tank 21 which are arranged side by side in the vehicle width direction, and a core 22 is interposed between these two tanks. Above right tank
An inlet pipe 23 for introducing the cooling water C from the engine 10 is provided at 20, and a supply pipe 24 for supplying the cooling water C cooled by the core 22 to the engine 10 is provided at the left side tank 21. A supply pipe 25 for the cooling water C is provided at the upper end of the left side tank 21, and the supply pipe 25 is connected to a reservoir tank for the cooling water C (not shown).

The core 22 has a corrugated fin tube shape, and has tubes 27 for circulating the cooling water C from the right side tank 20 to the left side tank 21, and the tubes 27 are arranged in parallel in parallel with each other. Further, the core 22 has corrugated plate-like fins 28 welded at a predetermined pitch between the tubes 27, and the traveling wind W passes through the gaps formed by the tubes 27 and the fins 28. . Further, the core 22 has a distribution direction of the traveling wind W, that is, a direction in which the traveling wind W flows, so that the core 22 does not interfere with the main frame 14, the carburetor 16, and the carburetor cover 17.
The thickness dimension in the front-rear direction of the vehicle body is different, and the side surface cross-sectional shape is a convex shape in which the midway portion in the up-down direction projects rearward.

The core 22 will be described in more detail.
Is composed of a two-layer front core F shown in the range F in the figure and a two-layer rear core R shown in the range R in the figure. The rear core R is located in the vertical middle part of the rear surface of the front core F. It is integrally molded and thickened in the direction of traveling air flow.

The fin pitch of the rear core R shown in FIG.
The symbol Pr shown in the figure) is large, and is formed to Pr = 3.5 mm, for example. On the other hand, in the thin two-layer portion where the front core F and the rear core R do not overlap each other, the upper portion of the front core F shown in FIG.
The fin pitch in Fu (illustrated by reference numeral Pu in FIG. 3) is small, and is formed to Pu = 2.5 mm, for example. Further, the fin pitch (shown by reference symbol P1 in FIG. 3) in the lower portion F1 of the front core F shown in FIG. 3 is also small, for example, P1 = 2.5 mm. Further, in the thick four-layer portion where the front core F and the rear core R are overlapped with each other, the fin pitch (shown by Pm in FIG. 3) at the midway portion Fm in the vertical direction of the front core F shown in FIG. 3 is the rear portion. The core R is larger than the upper core Fu and the lower core F1 of the front core F, and is formed to have Pm = 4.0 mm, for example. That is, the fin pitches are represented by the relationship of Pu = P1 <Pr <Pm. In this way, fins 28 are attached to the front tube 27 forming the front core F and the rear tube 27 forming the rear core R, respectively, to increase the thickness in the flow direction of the running wind and increase the total heat dissipation area. At the same time, the fin pitch of the fin 28 is changed between the front side and the rear side.

The cooling water C that has cooled the engine 10 is the radiator 18
It flows through the inside through the introduction pipe 23 → the right side tank 20 → the core 22 → the left side tank 21, and is again made to flow from the supply pipe 24 toward the engine 10. At this time, in the core 22, the fins from the cooling water C
The heat is transferred to 28, and the heat is radiated from the fins 28 to the traveling wind W passing through the core 22 to cool the cooling water C.

In the above case, the dimension of the rear core R in the vertical direction is the front core F.
Since the rear core R is integrally molded on the rear surface of the front core F on the middle portion Fm between the upper and lower portions Fu, F1 of the front core F, the upper and lower portions of the core 22 are It consists of only core F, and this front core F and rear core R
The core 22 made of the above has a smaller thickness in the passing direction of the traveling wind W than the midway portion in the vertical direction, that is,
The upper and lower parts of the core 22 allow the traveling wind W to pass through more easily than the midway part of the core 22.

Therefore, the traveling wind W flowing from the front of the motorcycle 1 toward the radiator 18 is affected by the front portion of the main frame 14 and the engine 10, respectively.
However, although trying to prevent passing through the upper and lower parts,
With the above-described configuration, the traveling wind W sufficiently passes through the upper and lower portions of the core 22, and thus the traveling wind W is prevented from being lopsided in the radiator 18.

Further, since the fin pitches Pu, P1 in the upper part Fu and the lower part F1 of the front core F are smaller than the fin pitches Pm, Pr of the middle part Fm of the front core F and the rear core R, respectively. The cooling areas above and below the core 22 are to be increased.

Furthermore, since the fin pitches Pm and Pr of the middle portion Fm of the front core F and the rear core R are different from each other,
Since the fins 28 of the middle part Fm of the front core F and the rear core R are displaced from each other, when the traveling wind W passing through the front core F is directed to the rear core R, the traveling wind W is By touching the rear core R so as to collide with it, it is possible to prevent the local heat transfer efficiency from decreasing in the radiator 18 toward the downstream side.

On the other hand, even when dust or small stones on the road surface are scraped up by the front wheels 5 and collide with the radiator 18 and the front edge of the fin 28 of the front core F is bent, the front edge of the fin 28 is bent. The fin pitch Pm of the middle part Fm of the rear core F is the rear core R
Since the fin pitch is larger than the fin pitch Pr, it is suppressed that the bending of the fin 28 immediately causes clogging of the middle portion Fm of the front core F. Further, since the fin pitch Pr of the rear core R is smaller than the fin pitch Pm of the middle part Fm of the front core F, the cooling effect is reduced by increasing the fin pitch Pm of the middle part Fm. .

(Effect of the Invention) According to the present invention, of the front core and the rear core forming the radiator core, the vertical dimension of the rear core is made shorter than the vertical dimension of the front core. Since the rear core is integrally molded on the rear surface of the middle part between the upper and lower parts of the core, the upper and lower parts of the core are composed only of the front core, and the same structure is composed of the front core and the rear core. The thickness of the core in the passing direction of the traveling wind is smaller than that in the middle part of the core in the vertical direction, that is, the upper and lower parts of the core are more likely to pass the traveling wind than the middle part of the core.

Therefore, the traveling wind flowing from the front of the straddle-type vehicle toward the radiator will be affected by the front portion of the main frame and the engine, and will be prevented from passing through the upper and lower portions of the radiator. However, due to the above configuration, the traveling wind sufficiently passes through the upper and lower portions of the core, so that the traveling wind is prevented from being unevenly distributed in the radiator and the efficiency of heat exchange by the radiator is improved. Improve,
The cooling water will be sufficiently cooled.

However, as described above, when the efficiency of heat exchange by the radiator is improved, the vertical dimension of the rear core is made shorter than the vertical dimension of the front core.
The radiator is lighter, which is beneficial for reducing the weight of the saddle type vehicle.

Further, since each fin pitch in the upper part and the lower part of the front core is made smaller than the fin pitch in the middle part of the front core and the rear core, the cooling area in the upper part and the lower part of the core increases, Therefore, the cooling water is cooled more sufficiently.

Furthermore, the fin pitches of the middle part of the front core and the rear core are different from each other.

For this reason, since the fins of the middle part and the rear core of the front core are displaced from each other, when the traveling wind passing through the front core is directed to the rear core, the traveling wind collides with the rear core. Thus, the local heat transfer efficiency is prevented from decreasing as it goes downstream in the radiator.

Therefore, also in this respect, the efficiency of heat exchange by the radiator is improved, and the cooling water is further effectively cooled.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an overall side view of a motorcycle, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG. FIG. 4 shows IV-IV of FIG.
FIG. 1 …… Motorcycle (saddle-type vehicle) 2 …… Body frame 3 …… Steering shaft tube 10 …… Engine 14 …… Main frame 18 …… Radiator 22 …… Core 27 …… Tube 28 …… Fin F… Front core R Rear core Fu Fu Upper Fm Middle F1 Lower P1, Pm, Pr, Pu Fin fin pitch W Running wind C Cooling water

Claims (1)

[Claims] 1. A main frame extending rearward and downward from a steering shaft tube provided at a front end of a body frame, and an engine is supported on the body frame below the main frame,
A radiator is provided between the lower surface of the front portion of the main frame and the engine, and the core of the radiator is composed of a large number of tubes for circulating cooling water and fins attached at a predetermined pitch between the tubes, and , In the radiator structure of the saddle-ride type vehicle in which the core is composed of a front core and a rear core, the vertical dimension of the rear core is made shorter than the vertical dimension of the front core, The rear core is integrally molded on the rear surface of the middle part between the upper and lower parts, and the fin pitches in the upper part and the lower part of the front core are made smaller than the fin pitches of the middle part and the rear core of the same front core, A radiator structure for a saddle-ride type vehicle characterized in that the fin pitches of the front core and the rear core are different from each other.