JPH0211272Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a motorcycle in which an engine is provided below the main frame, a carburetor is placed at the rear upper part of the engine, and a radiator (including an oil cooler) is placed in front of the engine. It is.

Prior Art In such a motorcycle, airflow (driving wind) generated opposite to the vehicle body while driving flows into the radiator and cools the cooling water in the radiator, and the engine is cooled by this cooling water. Ru.

The running wind also flows to the rear carburetor and serves to cool the carburetor, prevent the temperature of engine intake air from rising, and improve intake efficiency.

Problems that the invention aims to solve However, the flow of air toward the rear carburetor is easily obstructed by body frame members, the engine, and other body parts, especially in motorcycles with a radiator located in front of the engine. is significantly affected by the radiator. Furthermore, in order to improve the flow of air to the carburetor, it is necessary to provide space between each member, and it is not possible to make the entire vehicle body compact by arranging each member close to each other.

Therefore, the present invention provides a motorcycle that is capable of sending a sufficient amount of air to the rear carburetor without being obstructed by the front radiator, etc., and that also allows the entire body to be made compact by arranging each component of the vehicle body close to each other. This is what we are trying to provide.

Means and Effects for Solving the Problems Therefore, in the present invention, the front end is fixed to the head pipe and extends diagonally downward to the rear, and the width in the vertical direction of the vehicle body is longer than the width in the left and right direction of the vehicle body. A vehicle body frame is constituted by a pair of left and right main frames and a center pillar that is fixed to the rear end of the main frame and swingably supports a rear fork.An engine is provided below the main frame, and in front of the engine By arranging a radiator on the left and right main frames, and covering the upper part between the left and right main frames with other vehicle body parts such as a fuel tank, the upper part is covered with the body parts, both sides are covered with the left and right main frames, and the lower part is covered with the engine and radiator. An air passage is formed which opens toward the front and guides running wind into the vehicle body frame through the opening, and a carburetor provided at the rear upper part of the engine is disposed within the air passage.

According to the present invention, an air passage is formed in front of the carburetor, which is defined by vehicle body parts such as the fuel tank above, the vertically wide main frame on both sides, and the engine and radiator below. A part of the wind coming in from the front,
The air is guided by the air passage, passes above the radiator, and heads directly to the rear carburetor, effectively cooling the carburetor.

Since the above-mentioned air passage is formed, even if the carburetor, engine, radiator, main frame, other vehicle body parts, etc. are placed close to each other, a sufficient amount of air can be sent to the carburetor, and the main frame Coupled with the vehicle body frame structure in which a center pillar is fixed to the rear end and a rear fork is pivotally supported on the center pillar, the vehicle body parts can be concentrated in the center of the vehicle body and the entire vehicle body can be made compact.

Embodiment Hereinafter, the present invention will be described with reference to an illustrated embodiment. Fig. 1 is a side view of a motorcycle to which the present invention is applied.The body frame of this motorcycle includes a head pipe 1, and a pair of left and right main frames with a rectangular cross section whose front ends are fixed to the head pipe 1 and extend diagonally downward and rearward. 2 (see FIG. 2), a center pillar 3 fixed to the rear end of each main frame 2 and extending substantially vertically, and this center pillar 3.
A backstay is provided between a pair of left and right seat rails 4 which are fixed at the middle to the upper end and fixed at the front end to the middle of the main frame 2 and extend rearward, and a back stay provided between the center pillar 3 and the seat rail 4. 5
It is made up of. A front fork 6 is pivotally attached to the head pipe 1 via a steering mechanism, and a front wheel 7 is supported by the front fork 6. Also, the rear fork 8 is located at the bottom of the center pillar 3.
is pivotably attached to the rear fork 8, and a rear wheel 9 is supported by the rear fork 8. Reference numeral 10 denotes a rear suspension provided between the vehicle body frame and the rear fork 8.

An engine 11 is mounted below the main frame 2. The engine 11 has its rear lower part attached to the lower end of the center pillar 3, and its front upper part attached to the main frame 2 via an engine hanger 12. The engine 11 itself also serves as a strength member of the vehicle body frame.
The illustrated engine 11 is a V-type engine, and includes cylinders arranged substantially vertically and cylinders 13a arranged substantially longitudinally. A carburetor 14 is arranged at the rear upper part, and a radiator 15 is arranged at the front.

A fuel tank 16 is placed above the main frame 2 and the seat rail 4. This fuel tank 16 is spanned between each pair of left and right main frames 2 and seat rails 4, so that the upper part of the engine 11 is covered by the bottom surface of this fuel tank 16. Note that the middle portion of the bottom surface in the width direction protrudes between the left and right main frames 2 and the seat rails 4, as shown by 16a and 16b in the figure.

A baffle plate 17 is provided at the center above the radiator 15 so as to guide the wind from the front beyond the top of the radiator 15 to the rear thereof.The front end of the baffle plate 17 is connected to the head pipe The cowling 18 is supported by the rear end portion of the cowling 18 covering the front side of the cowling 1. This baffle plate 17 is shown in FIGS.
As shown in the figure, a groove is formed by a bottom plate 19 and side plates 20 erected along both side edges of the bottom plate 19, and the front part is made low and wide to absorb as much wind as possible when traveling. is arranged so that it smoothly passes over the radiator 15 and is guided to the rear. As shown in FIG. 3, the upper part of the baffle plate 17 is covered with the main frame 2 and the bottom surface of the fuel tank 16, thereby forming an air passage 21 that communicates the front and rear of the radiator 15. The main frame 2, which has a rectangular cross section, has a vertical width longer than a horizontal width, and this long vertical width effectively serves as a side wall of an air passage.

The bottom plate 19 extends further rearward from the radiator 15 almost along the upper surface of the engine 11, and serves as a partition wall 22 that partitions the engine portion from the upper part of the vehicle body. Both side edges and the rear edge of this partition wall 22 are surrounded by side plates 23 which are extensions of the side plates 20. Therefore, the partition wall 22 serves as a heat shield wall for the engine 11 and at the same time as a heat shield wall for the main engine 11. Fuel tank 16 on the inner side and upper side of the frame 2
Together with the lower surface, it constitutes an air passage that is continuous with the air passage 21.

A suitable hole is provided at the rear of the partition wall 22, and the carburetor 14 is inserted into the partition wall 22 through this hole.
protrudes above. That is, the carburetor 14
is exposed in the air passage continuous with the air passage 21. A recess 24 is formed on one side of the front part of the partition wall 22, and this is a position corresponding to the cylinder 13 arranged in the vertical direction. It is arranged to avoid

Since this embodiment is configured as described above,
A part of the running wind that flows into the front of the radiator 15 while driving is transferred to the air guide plate 1 in front of the radiator 15.
7, the air passes directly over the top of the radiator 15 and flows into the air passage 2, as shown by the arrows in FIGS. 1 and 2, without flowing into the radiator 15.
Proceed backwards along 1. Then, it is guided by the partition wall 22 and side plate 23 that are continuous with the baffle plate 17, and is guided to the carburetor 14 exposed on the partition wall 22, and after sufficiently cooling the carburetor 14, it is discharged to the rear of the vehicle body. Moreover, since the upper part of this air passage is covered by the vehicle body upper structure such as the fuel tank 16, and the side part is covered by the main frame 2, the air flowing through this passage does not escape upward or to the sides, and is ensured to the rear. Flows toward the carburetor 14. Due to the formation of such an air passage and the body frame structure in which the center pillar 3 is fixed to the rear end of the main frame 2 and the rear fork 8 is pivoted to the center pillar 3, the body parts are concentrated in the center of the vehicle body. The entire car body is compact. In addition,
In this specification, a radiator is not limited to one for cooling engine coolant, but also includes an oil cooler for cooling oil.

Effects of the Invention As described above, the present invention consists of a pair of left and right main frames, each having a cross-sectional shape whose front end is fixed to the head pipe and extends diagonally downward to the rear, and whose width in the vertical direction of the vehicle body is longer than the width in the left and right direction of the vehicle body. , a center pillar fixed to the rear end of the main frame and swingably supporting the rear fork constitutes a vehicle body frame, an engine is provided below the main frame, and a radiator is arranged in front of the engine, By covering the upper part between the left and right main frames with other vehicle body parts such as a fuel tank, the upper part is covered with the body part, both sides are covered with the left and right main frames, the lower part is covered with the engine and the radiator, and the lower part is covered with the engine and radiator. An air passage is formed that is opened and guides the running wind into the vehicle body frame through the opening, and a carburetor provided at the rear upper part of the engine is disposed within the air passage, so that a sufficient amount of running wind flows to the front. The fuel is sent to the rear carburetor without being obstructed by the radiator, allowing the carburetor to be effectively cooled. Furthermore, the members and attached parts constituting the vehicle body can be disposed close to each other in the center of the vehicle body, thereby making it possible to make the entire vehicle body compact.

[Brief explanation of the drawing]

FIG. 1 is a side view of a motorcycle to which the present invention is applied, FIG. 2 is a plan view of the air guide plate and a partition wall connected thereto, and FIG. 3 is a front view of the radiator and the air guide plate. 1... Head pipe, 2... Main frame,
3... Center pillar, 4... Seat rail, 5...
...Backstay, 6...Front fork, 7...
...Front wheel, 8...Rear fork, 9...Rear wheel, 10
...Reaction, 11...Engine, 12...
...Engine hanger, 13...Cylinder, 14...
... Carburetor, 15 ... Radiator, 16 ... Fuel tank, 17 ... Wind guide plate, 18 ... Cowling, 19 ... Bottom plate, 20 ... Side plate, 21 ... Air passage, 22 ... Partition wall, 23 ... ...Side plate, 24...
recess.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pair of left and right main frames that are fixed at their front ends to head pipes and extend obliquely downward to the rear, and have a cross-sectional shape in which the width in the vertical direction of the vehicle body is longer than the width in the left and right direction of the vehicle body; A center pillar is fixed to the rear end of the main frame and pivotally supports the rear fork to form a vehicle body frame, an engine is provided below the main frame, and a radiator is arranged in front of the engine. By covering the upper part between the left and right main frames with other vehicle body parts such as a fuel tank, the upper part is covered by the body part, the left and right main frames are covered on both sides, the engine and the radiator are lower part, and the opening is opened toward the front. A motorcycle characterized in that an air passage is formed through the opening to guide running wind into the body frame, and a carburetor provided at the rear upper part of the engine is disposed within the air passage. (2) The motorcycle according to item 1, further comprising a partition wall extending from the opening to at least the carburetor arrangement position above the radiator and the engine.