JP2686939B2 - Motorcycle oil tank device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil tank device for a motorcycle in which a fuel tank is integrally provided with an oil tank. (Prior Art) For example, when a two-cycle internal combustion engine mounted on a motorcycle is a separate refueling type engine, a fuel tank and an oil tank are provided. Conventionally, the oil tank is formed separately from the fuel tank.For example, as shown in Japanese Utility Model Publication No. 59-31503, the oil tank is covered with a side cover below the seat at the rear position of the fuel tank. Some are arranged so that they can be seen. (Problems to be Solved by the Invention) When the oil tank is formed separately from the fuel tank as described above, there is an advantage that the arrangement position of the oil tank can be freely set. The number of points increases and the manufacturing cost increases. Further, it is necessary to provide a mounting mount for the oil tank separately from the mounting mount for the fuel tank, and it may be difficult to secure the capacity of the oil tank depending on the arrangement space. By the way, when the fuel tank straddles the vehicle body frame, the bottom portion of the fuel tank has a concave portion in which the inner bottom plate is bent inward and upward so as to straddle the vehicle body frame. If it can be integrally formed with the oil tank, the capacity of the oil tank can be increased and the number of parts forming the tank can be reduced, so that the manufacturing cost can be reduced. Also,
The fuel tank and the oil tank can be mounted in common, and it is possible to mount the oil tank and the fuel tank in common without special mounting mounts, and the tank mounting structure is simple. The present invention has been made in view of such circumstances, and in an oil tank device for a motorcycle, the oil tank is integrally formed by utilizing the recess of the fuel tank, thereby increasing the capacity of the oil tank and reducing the number of parts. The objective is to reduce the manufacturing cost and reduce the manufacturing cost, and to simplify the mounting structure by sharing the tank mounting. (Means for Solving the Problems) In order to solve the above problems, the present invention relates to an oil tank device for a motorcycle, in which a fuel tank has a recess formed by bending an inner bottom plate inward and upward so as to straddle left and right main frames. Is formed, the left and right bottom parts of the fuel tank are located on both sides of the main frame and are connected by communication pipes,
A switching cock for discharging fuel is provided on one bottom, and a tank member is joined and fixed to the upper and both side wall surfaces of the recess, and an oil tank is formed by the wall surface of the recess and the tank member, and at the front side of the fuel tank. A mounting bracket welded to the side wall of the inner bottom plate is attached to the main frame via the elastic body on the front side, and the rear end of the mounting bracket fixed to the rear part of the oil tank is a stay fixed between the left and right seat rails. In addition, the front elastic body and the rear elastic body are connected to each other through the rear elastic body at substantially the same height position, and the communication pipe is connected to the front elastic body and the rear elastic body. The structure is arranged approximately at the center of the space. (Operation) In the present invention, the recess that straddles the vehicle body frame of the fuel tank is used, and the oil tank is formed integrally with the fuel tank by the wall surface of the recess and the tank member. By using the concave portion of the fuel tank in this way, it is possible to reduce the number of parts forming the oil tank and increase the tank capacity. Furthermore, the mounting mount for the oil tank and the mounting mount for the fuel tank are common, and the tank mounting structure is simple. Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a vehicle body frame, and a two-cycle internal combustion engine 5 is mounted in a space surrounded by left and right main frames 3 extending rearward from head pipes 2 constituting the vehicle body frame 1 and left and right down tubes 4. Further, the fairing 6 covers from the front side of the vehicle body to above the two-cycle internal combustion engine 5. The two-cycle internal combustion engine 5 is of a separate refueling type and includes a fuel tank 7 and an oil tank 8,
The oil from the oil tank 8 is pressure-fed by an oil pump (not shown) and is supplied to the crank chamber of the two-cycle internal combustion engine 5 together with the fuel from the fuel tank 7 to lubricate each part of the internal combustion engine. The fuel tank 7 and the oil tank 8 are provided above the two-cycle internal combustion engine 5 so as to straddle the left and right main frames 3, and behind them are the front side portions of the coordinate seats 10 provided on the left and right seat rails 9. Is covered with. The oil tank 8 is integrally formed with the fuel tank 7 as shown in FIGS. 2 to 4, and is attached to the left and right main frames 3 and the seat rails 9 at substantially the same height position. The fuel tank 7 is formed by welding an outer plate 7a and an inner bottom plate 7b at the lower part and the front and rear, and the inner bottom plate 7b is bent inward and upward so as to have a U-shape when viewed from the front, and a concave portion 11 whose lower part is opened. Are formed. The fuel tank 7 has the recess 11 and the head pipe 2
The right and left bottom surfaces 12 of the fuel tank 7 are located on both sides of the left and right main frames 3, respectively. The bottom 12 is connected by a communication pipe 13 as shown in FIGS. 2 and 3, and one bottom
A switching cock 14 for discharging fuel is provided on the front side of 12 and communicates with a carburetor 17 via a fuel hose 15 and a negative pressure hose 16. The carburetor 17 is connected to the two-cycle internal combustion engine 5, and the carburetor 17 mixes the air from the air cleaner 18 with the fuel from the fuel tank 7 to mix it with the two-cycle internal combustion engine 5.
To be supplied to Behind the communication pipe 13 of the fuel tank 7, as shown in FIGS. 2 to 4, the tank member 19 is welded and fixed to the upper and both side wall surfaces of the inner bottom plate 7b forming the recess 11.
The oil tank 8 is formed by the upper and inner wall surfaces of the inner bottom plate 7b and the tank member 19. The tank member 19 is formed by bending a thin metal plate into a U-shape, and is open at the left and right and above. The tank member 19 is applied to the wall surface of the recess 11 formed in the fuel tank 7 in advance, Since the oil tank 8 is integrally formed with the fuel tank 7 by welding the joint portion between the both, the number of parts forming the oil tank 8 is reduced. Further, since the oil tank 8 is formed integrally with the fuel tank 7, the capacity of the oil tank 8 can be increased with a simple structure as compared with a case where the oil tank is formed separately from the fuel tank. Further, since the oil tank 8 is formed by welding the tank member 19 to the concave portion 11 of the fuel tank 7, the left and right bottom portions 12 located on both sides of the left and right main frames 3 are connected and supported to each other. As a result, it can suppress the vibration of the tank during traveling. As shown in FIGS. 2, 4, and 5, a pair of upper and lower mounting brackets 20 and 2 fixed to the rear portion of the oil tank 8.
The horizontal part of 1 is projected rearward, and this mounting bracket 20,21
The rib 22a of the spacer 22 fitted from below is inserted into the holes 20a, 21a formed at the rear end of the spacer. Holes 20a, 21a and ribs 22
A spacer 23 is applied to the upper part of the hole 20a and between the mounting bracket and the mounting bracket welded to the front side of the fuel tank 7 when the fuel tank 7 and the oil tank 8 are formed.
The fuel tank 7 and the oil tank 8 are welded by positioning with respect to 24. The fuel tank 7 and the oil tank 8 are mounted by mounting the mounting bracket 24 welded to the side wall of the inner bottom plate 7b at the front side of the fuel tank 7 to the cross member 25 welded between the main frames 3 (see cross section in FIG. 2). (As shown in FIG. 2), it is attached via a front damper (elastic body) 26 located at the center in the left-right direction. On the other hand, spacers 22 and 23 that are in contact with the upper and lower sides of the mounting brackets 20 and 21 fixed to the oil tank 8, respectively.
Is applied to the support tube 28 fixed between the left and right seat rails 9 and welded to the upper side of the stay 27 via rear dampers (elastic bodies) 29 located below and inside. Then, the damper 30 is brought into contact with the spacer 23, and the stay 27
A bolt 33, which is inserted into a support tube 28 via a washer 32, is screwed to a nut 31 fixed to the lower side, and the mounting brackets 20 and 21 are attached to the stay 27. As shown in FIG. 4, the mounting brackets 20 and 21 are mounted via dampers 29 and 30 at the center portion in the left-right direction. Further, the front side damper 26 and the rear side damper 29 are arranged at substantially the same height position, and the communication pipe 13 is arranged at a substantially central position between the front side damper 26 and the rear side damper 29. There is.
Since the oil tank 8 is formed integrally with the fuel tank 7 in this manner, the mounting structure for mounting the oil tank 8 and the fuel tank 7 on the vehicle body frame can be made common and the mounting structure is simplified. An injection pipe 34 for injecting oil is welded to the rear wall of the oil tank 8 as shown in FIG. 2, and the injection pipe 34 is normally closed by a cap 35. An oil level gauge 36 and an oil filter 37 are provided at the center of the bottom of the oil tank 8 in the left-right direction, and the oil level gauge 36 detects the remaining amount of oil in the oil tank 8. Further, an oil hose 38 is connected to the oil filter 37 as shown in FIGS. 2 and 4, and oil is supplied to an oil pump (not shown). The oil hose 38 has a large-diameter hose 38a on the oil tank side and a small-diameter hose 38b on the oil pump side. The oil surface fluctuates due to tilting of the vehicle body and the air bubbles from the oil tank 8 enter the large-diameter hose 38a. Even if something happens, it can be easily removed into the oil tank 8 and is prevented from being mixed into the small diameter hose 38b. An air vent pipe 39 is connected to the upper part of the oil tank 8 as shown in FIG.
a is an inner bottom plate 7 forming the fuel tank 7 and the oil tank 8.
Fixed to b. The middle portion of the air vent pipe 39 extends to a predetermined height in the fuel tank 7 and is bent downward, and the other end portion 39b is at a front position where the other end portion 39b is disengaged from the oil tank 8.
As shown in FIG. 6, it penetrates through the inner bottom plate 7b forming the recess 11 of the fuel tank 7 and projects to the outside (inside the recess 11).
Since the air vent pipe 39 extends high into the fuel tank 7 and the oil tank 8 communicates with the atmosphere at a high position, oil leakage does not occur even if the vehicle body tilts, and the air vent pipe 39 is exposed on the outer surface. The appearance is good because it is not done. As shown in FIG. 2, a fuel injection section 40 is provided on the upper part of the fuel tank 7, and a discharge pipe connected to the fuel injection section 40.
As shown in FIG. 6, 41 penetrates the inner bottom plate 7b forming the recess 11 of the fuel tank 7 and discharges the overflowing fuel to the outside. The fuel tank 7
A tachometer 42 is mounted on the front side of the. (Effects of the Invention) In the present invention, in the oil tank device for a motorcycle, the fuel tank is provided with a recessed portion formed by bending the inner bottom plate inward and upward so as to straddle the left and right main frames, and the wall surfaces of the upper portion and both side portions of the recessed portion By joining and fixing the tank member to the, and forming the oil tank with the wall surface of the recess and the tank member,
Since the oil tank is integrally formed by utilizing the recess of the fuel tank, it is possible to reduce the number of parts forming the oil tank and increase the tank capacity. Furthermore, the mounting mount for the oil tank and the mounting mount for the fuel tank can be made common, and the tank mounting structure is simple. In this invention, the left and right bottom portions of the fuel tank are located on both sides of the main frame and are communicated with each other by the communicating pipes.
A switching cock for fuel discharge is provided on one bottom, and a mounting bracket welded to the side wall of the inner bottom plate at the front side of the fuel tank is attached to the main frame via the elastic body on the front side and fixed to the rear part of the oil tank. The rear end of the attached mounting bracket is connected to the stay fixed between the left and right seat rails via the rear elastic body, and the front elastic body and the rear elastic body are at substantially the same height position. It is located in. The fuel tank and oil tank integrally formed in this way are
Since the front and rear sides are supported at approximately the same height through the elastic body, the weight of the fuel in the fuel tank and the oil in the oil tank act evenly on the front and rear elastic bodies, and the bending moment is not applied. Since the vibration of the vehicle body is not biased and transmitted, the life of the front and rear elastic bodies is extended. According to the present invention, since the communication pipe is further arranged at the substantially central position between the elastic body on the front side and the elastic body on the rear side, the amount of oil or fuel is reduced, and the weight balance between the front and rear is disturbed. Even if the amount of bending of the elastic body changes from front to back and the fuel tank tilts, the vertical position of the communication pipe does not change, the fuel moves smoothly between the left and right bottom portions, and the fuel can be used up to the end.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a motorcycle equipped with an oil tank device of the present invention, FIG. 2 is a sectional view of the oil tank device, and FIG. 3 is a sectional view taken along line III-III of FIG. , Fig. 4 is IV- in Fig. 2.
IV sectional view, FIG. 5 is a sectional view of the mounting portion of the oil tank, and FIG. 6 is a VI-VI sectional view of FIG. In the figure, reference numeral 3, main frame, 5 two-cycle internal combustion engine, 7 fuel tank, 7b inner bottom plate, 8 oil tank,
Reference numeral 11 is a concave portion, 12 is a bottom portion, 19 is a tank member, 26 is a front elastic body (damper), and 29 is a rear elastic body (damper).

Claims (1)

(57) [Claims] The fuel tank is formed with a recess formed by bending the inner bottom plate inward and upward so as to straddle the left and right main frames, and the left and right bottom parts of the fuel tank are located on both sides of the main frame and are connected by a communication pipe. A switching cock for discharging fuel is provided on the bottom, and a tank member is joined and fixed to the upper and side wall surfaces of the recess, and an oil tank is formed by the wall surface of the recess and the tank member, and an inner bottom plate is formed on the front side of the fuel tank. The mounting bracket welded to the side wall of the is attached to the main frame via the front elastic body, and the rear end of the mounting bracket fixed to the rear part of the oil tank is attached to the stay fixed between the left and right seat rails. The front elastic body and the rear elastic body are connected to each other through the rear elastic body, and the communication pipe is connected between the front elastic body and the rear elastic body. Approximately center It disposed a motorcycle oil tank device.