JP2684634B2 - Vehicle radiator and oil tank arrangement structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to an arrangement structure of a radiator and an oil tank in a motorcycle, for example, and particularly to an arrangement structure capable of ensuring a sufficient oil tank capacity. [Prior Art] In a vehicle equipped with a separate refueling two-cycle engine,
It is equipped with an oil tank that contains the engine lubricating oil. As the arrangement structure of this oil tank, conventionally, the oil tank is arranged in a triangular area surrounded by a seat pillar extending downward from the rear end of the main pipe, a seat rail extending rearward, and a back stay connected to both. There is a structure (see, for example, JP-A-60-183229). [Problems to be Solved by the Invention] By the way, since the oil tank requires a relatively large capacity, it is important to secure a sufficient space for disposing the oil tank. However, since it is common to arrange an air cleaner, a shock absorber for the rear wheel suspension device, etc. in the triangular area, it is difficult to secure a sufficient space for disposing the oil tank, and the tank capacity Can't be too big. Particularly in recent years, it has become necessary to increase the capacity of the air cleaner in order to reduce intake noise, and it is becoming more and more difficult to expand the capacity of the oil tank. In view of the above-mentioned conventional situation, an object of the present invention is to provide a vehicle radiator and an oil tank arrangement structure capable of ensuring a sufficient tank capacity. [Means for Solving Problems] In the vehicle equipped with a water-cooled engine, the inventor may arrange the radiator only on one side in the vehicle width direction depending on the required capacity of the radiator. The other side part is generally a large space, and it is focused on the point that the capacity of the oil tank can be expanded by using this space. According to the present invention, a vehicle body frame includes an upper down tube extending downward from a steering shaft tube, a left extending downward from a lower end of the upper down tube, and a left extending rearward below an engine.
An exhaust pipe provided with a pair of lower down tubes on the right side, the exhaust pipe extending once between the left and right lower down tubes to one side in the vehicle width direction and bent downward on the one side, and the exhaust pipe. And a large-capacity exhaust chamber that extends to the other side in the vehicle width direction, bends upward on the other side, and extends backward to pass below the fuel tank. In a radiator and oil tank arrangement structure for a vehicle equipped with an engine, extending from the steering shaft cylinder connection portion of the upper down tube to the lower down tube connection portion on one side in the vehicle width direction and below the front portion of the fuel tank. A vertically long radiator is arranged vertically and its lower end is located in the vicinity of the bent portion of the exhaust pipe, and the radiator is provided on the other side in the vehicle width direction and below the front portion of the fuel tank. A vertically long oil tank having a length shorter than that of the radiator is oriented vertically, with its upper end located at substantially the same height as the upper end of the radiator and its lower end located near the rear bent portion of the exhaust chamber. And the outer side in the vehicle width direction of the radiator is covered with the cover member on one side, and the rear bent portion of the oil tank and the exhaust chamber has the same vertical dimension as the cover member on the other side. And the front side of the radiator and the oil tank are covered with a louver. [Operation] According to the radiator and the arrangement structure of the oil tank according to the present invention, the vertically long oil tank is arranged in the longitudinally wide space on the other side in the vehicle width direction between the exhaust pipe and the front portion of the fuel tank. Therefore, there is no problem of interference with other parts such as the above-mentioned triangular region, and the oil tank capacity can be greatly expanded. On the contrary, the air cleaner capacity can be increased by the amount that the oil tank is not arranged in the triangular region. And in this case, since the vertically long oil tank is arranged in the space that is long in the vertical direction, it is not necessary to dent the fuel tank in order to expand the oil tank capacity, and therefore sacrifice the fuel tank capacity. Nor. Further, in the above-mentioned vehicle in which the radiator is mounted only on one side in the vehicle width direction, since the other side has a space, when the vehicle is viewed from the front direction, there is no left and right symmetry, and there is an unbalanced appearance. Becomes Moreover, at the other side portion, the bottom surface of the fuel tank, the frame portion located below the fuel tank, and the like are exposed to the outside, which also tends to deteriorate the appearance. On the other hand, in the present invention, when viewed from the front of the vehicle, a radiator with a large vertical dimension and an exhaust pipe with a small vertical dimension are located on one side in the vehicle width direction and on the other side in the vehicle width direction. , An oil tank whose vertical dimension is smaller than the radiator and an exhaust chamber whose vertical dimension and diameter are larger than the radiator. Therefore, the traveling wind passes backward while cooling the exhaust pipe and the exhaust chamber, so that not only the radiator and the oil tank but also the exhaust system can be efficiently cooled. Moreover, since the side of the oil tank and the radiator are covered with the cover member and the louver is arranged in the front, the traveling wind and its wind pressure can be received in a balanced manner on the left and right sides of the vehicle, and the straightness of the vehicle is good. Become. In addition, the bottom surface of the fuel tank, the frame, etc. are hidden by the radiator and the oil tank, improving the appearance. Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are views for explaining a radiator and oil tank arrangement structure of a motorcycle according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes a motorcycle to which the structure of the embodiment is applied, and a body frame 2 of the motorcycle is a so-called semi-double cradle type steel pipe frame having the following configuration. That is, a main pipe 2b is connected to the steering shaft tube 2a, a pair of left and right seat pillars 2d extending downward, and a seat rail 2e extending rearward are connected to a rear end portion of the main pipe 2b. The seat rail 2e and the seat pillar 2d are connected by a back stay 2f. Further, an upper down tube 2c extending downward is connected to the steering shaft tube 2a, and a rear end of a pair of left and right lower down tubes 2g connected to a lower end of the steering down tube 2a is connected to a lower end of the seat pillar 2d. Has been done. A front fork 4 which pivotally supports the front wheel 3 at its lower end is pivotally supported to the left and right on the steering shaft cylinder 2a, and a rear arm 6 which pivotally supports a rear wheel 5 at its rear end at the lower end of the seat pillar 2d. Is pivotally supported up and down. In addition, a water-cooled two-cycle engine 10 is provided substantially in the center of the body frame 2, a fuel tank 7 and a seat 8 are provided at an upper portion thereof, and a rear fender 9 that covers an upper portion of the rear wheel 5 is provided at a rear end thereof. There is. The exhaust pipe 11 connected to the engine 10 once extends to the right (one side) in the vehicle width direction when seen from the front of the vehicle from between the left and right lower down tubes 2g, 2g, and is bent by the bent portion 11a at the one side. An exhaust pipe 11c bent downward, and a rising portion 11b extending to the other side in the vehicle width direction following the exhaust pipe 11c and on the other side.
And a large-capacity exhaust chamber 11d that bends upward and extends rearward so as to pass below the fuel tank. On the left and right sides of the upper down tube 2c, an oil tank support pipe 13 formed by bending a steel pipe in a U shape,
The radiator support pipe 12 is attached to the brackets 13a and 12a, respectively.
It is installed so as to spread in the vehicle width direction.
The support pipes 12 and 13 are located above the bent portion 11a and the rising portion 11b of the exhaust pipe 11 and below the front portion of the fuel tank 7, respectively. And each of the above support pipes
A radiator 14 and an oil tank 15 which are vertically long are arranged on the rear sides of the radiators 12 and 13, respectively.
In b, the oil tank 15 is bolted and fixed to a bracket 13b that is integral with the bracket 13a. The shapes of the support pipes 12 and 13 are substantially the same as the shapes of the outer peripheral edge portions of the radiator 14 and the oil tank 15, respectively, when viewed from the front. As a result, the radiator 14 is located on the right side in the vehicle width direction and below the front portion of the fuel tank 7, and the oil tank 15 is on the left side in the vehicle width direction and on the front portion of the fuel tank 7 and the rising portion 11b of the exhaust pipe 11. It is located between and. Further, louvers 16 and 17 for introducing traveling wind into the radiator 14 and the oil tank 15 are attached to the front sides of the support pipes 12 and 13, and further on the outer sides of the oil tank 15 and the radiator 14 in the vehicle width direction. Left, right side covers 19,1
8, the radiator 14 and the oil tank 15 are covered with louvers 16 and 17 on the front surfaces and side covers 18 and 19 with the side surfaces. Next, the operation and effect of this embodiment will be described. In a vehicle in which the radiator 14 is arranged only on one side in the vehicle width direction and the exhaust pipe 11 is arranged on the other side like the motorcycle 1 of the present embodiment, the exhaust pipe 11 and the front portion of the fuel tank 7 are separated from each other. In between
It is a long space in the vertical direction. In this embodiment, since the vertically long oil tank 15 is arranged in this space, the tank 15
The capacity can be greatly expanded as compared with, for example, the case of arranging in the above-mentioned triangular region. Since the vertically long oil tank is arranged in this vertically long space, the shape of the fuel tank 7 is not restricted, and therefore the fuel tank capacity is not sacrificed. Further, since the oil tank is removed from the triangular area, the capacity of the air cleaner can be sufficiently secured in the area, and the above-mentioned request for reducing intake noise can be met. Further, in the vehicle in which the radiator is arranged only on one side in the vehicle width direction, the other side is a space when viewed from the front, so that the left and right balance is poor, and the bottom surface of the tank is outside in this space part. Exposed to the outside and the appearance deteriorates. A louver is generally arranged on the front side of this space portion for left and right symmetry and for the inner cover, but even in this case, it is inevitable that the inner side can be seen from the outside. On the other hand, in this embodiment, since the vertically long oil tank 15 is arranged on the opposite side of the vertically long radiator 14, the left and right are well balanced and the inner part is hidden by this oil tank 15, so Can be improved. There is also an example in which other components such as a cooling water replenishment recovery tank are arranged in the vertically long space, but since this recovery tank has a capacity of about 1/3 that of an oil tank, There is not much advantage in arranging the recovery tank in a wide vertical space, and the effects of left and right balance and internal cover cannot be obtained. Further, in this embodiment, since the radiator 14 and the oil tank 15 are supported by the U-shaped support pipes 12 and 13, the support pipes 12 and 13 function as a protective member at the time of falling, for example, the radiator 14 and the oil tank. Can prevent 15 damage. Although the above example was applied to the motorcycle,
The scope of application of the present invention is not limited to motorcycles, but can be applied to any vehicle equipped with a separate refueling type two-cycle water-cooled engine. For example, a saddle riding type vehicle for traveling on rough terrain equipped with ultra-low pressure wide tires ( Of course, it can be applied to ATV). [Advantages of the Invention] According to the radiator and the oil tank arrangement structure of the vehicle according to the present invention as described above, since the vertically long oil tank is arranged in the vertically long space between the exhaust pipe and the front portion of the fuel tank, It has the effect of significantly expanding the oil tank capacity,
A radiator with a large vertical dimension and an exhaust pipe with a small vertical dimension are arranged on one side in the vehicle width direction, and an oil tank with a smaller vertical dimension and an exhaust chamber with a larger vertical dimension and diameter than the radiator are arranged on the other side in the vehicle width direction. As a result, not only the radiator and oil tank but also the exhaust system can be cooled efficiently. Moreover, the sides of the oil tank and the radiator are covered with a cover member, and the louver is arranged in the front, so the running wind and its wind pressure can be reduced. The left and right sides of the vehicle can be received in good balance, which has the effect of improving the straightness of the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 4 are views for explaining a radiator and oil tank arrangement structure of a motorcycle according to an embodiment of the present invention, and FIG. 1 is its front view and FIG. FIG. 3 is a side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a side view of a motorcycle to which the structure of the embodiment is applied. In the figure, 1 is a motorcycle, 7 is a fuel tank, 10 is an engine, 11 is an exhaust pipe, 14 is a radiator, 15 is an oil tank, and 18 and 19 are side covers (cover members).

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Claims (1)

(57) [Claims] The vehicle body frame includes one upper down tube extending downward from the steering shaft tube and a pair of left and right lower down tubes extending downward from the lower end of the upper down tube and extending rearward below the engine. An exhaust pipe extending from one of the left and right lower down tubes to one side in the vehicle width direction and bending downward at the one side; and an exhaust pipe extending to the other side in the vehicle width direction following the exhaust pipe. Arrangement of a radiator and an oil tank of a vehicle equipped with a separate refueling type two-cycle engine, provided with a large-capacity exhaust chamber that bends upward on the other side and extends backward so as to pass below the fuel tank. In the structure, on the one side in the vehicle width direction and below the front part of the fuel tank, a vertically long radial extending roughly from the steering shaft tube connecting portion of the upper down tube to the lower down tube connecting portion. The vertical direction and the lower end of the exhaust pipe is located in the vicinity of the bent portion of the exhaust pipe, and the length is longer than the radiator on the other side in the vehicle width direction and below the front portion of the fuel tank. Of the radiator is arranged vertically with its upper end located at substantially the same height as the upper end of the radiator and its lower end near the rear bend of the exhaust chamber. While covering the width direction outer side with one side cover member,
The rear bent portion of the oil tank and the exhaust chamber is covered with a cover member on the other side having the same vertical dimension as the cover member on the one side, and the radiator and the front side of the oil tank are covered with louvers. Vehicle radiator and oil tank arrangement structure.