JPS624079Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a structure for attaching a fuel tank to the body frame of a motorcycle.

The present applicant previously provided an injection pipe projecting upward on the upper surface of a hollow upper pipe that is connected to a head pipe and forms a vehicle body frame, thereby making the interior of the upper pipe an oil tank, and We proposed a structure in which a fuel tank made of synthetic resin is placed above the pipe.

In this case, the fuel tank mounting structure is such that a protruding piece with a hole is attached to the center of the front part of the fuel tank in the width direction, and the hole of this protruding piece is fitted into the injection pipe via a cylindrical rubber bushing. The rear part of the fuel tank is attached to the vehicle frame with screws.
However, although this mounting structure allows for reliable positioning in the longitudinal and lateral directions, the vertical positioning of the front portion of the fuel tank is not always reliable. There are also models in which the front part of the fuel tank is attached to the vehicle body frame with screws, but in this case the number of parts increases and assembly becomes complicated.

This invention was proposed in view of the above-mentioned circumstances, and aims to provide a fuel tank mounting structure that is simple in construction and can be reliably mounted to a vehicle body frame.

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 6.

FIG. 1 shows the main parts of a motorcycle to which the present invention is applied, seen from the side. 1 is a body frame, 2 is a fuel tank, 3 is an engine, 4 is a seat, and 5 is a carburetor.

The vehicle body frame 1 includes a head pipe 1 that rotatably supports a steering stem (not shown).
Reinforcement plates (gussets) 1c are welded to both sides of the joint between the head pipe 1a and the upper pipe 1b extending from the upper part of the head pipe 1a toward the seat 4 side. A threaded portion that fixes the protruding portion 1d that restricts downward movement and the lower pipe 1e that supports the engine 3, and fixes the rear part of the fuel tank 2 to the joint between the rear end of the upper pipe 1b and the seat pipe 1f. 1
g. The upper pipe 1b is liquid-tightly closed at both ends by plugs 1h, and
An injection pipe 1i that stands approximately upright and communicates with the inside of the upper pipe 1b is welded to the upper part near the head pipe 1a, and a discharge port 1j is formed at a position near the seat 4 to serve as an oil tank. As shown in FIGS. 2 and 3, a collar-shaped bracket 1k for restraining upward movement of the fuel tank 2 is provided at the middle of the injection pipe 1i.

The fuel tank 2 is integrally molded using a blow molding method using a synthetic resin material, and as shown in FIGS. 1 and 2, the upper pipe 1b is inserted into the bottom of the tank body 2a, which serves as a container. A groove 2b extends along the longitudinal direction of the vehicle body, and a groove 2c for inserting the injection pipe 1i of the vehicle body frame 1 is provided in the front part of the tank body 2a.
i, and as shown in FIGS. 1, 5, and 6, a tongue-shaped tongue having a through hole 2d corresponding to the threaded portion 1g of the vehicle body frame 1 is provided at the rear of the tank body 2a. A rear mounting portion 2e is provided.

The groove portion 2b and the groove portion 2c described above communicate with each other at the lower front end of the tank body 2a, and the inner wall portion 2 of the groove portion 2b faces each other with the upper pipe 1b sandwiched therebetween.
A first engaging portion 2g that engages with the protruding portion 1d of the vehicle body frame 1 to prevent downward movement of the tank body 2a is provided at f, and also faces oppositely with the injection pipe 1i of the groove portion 2c sandwiched therebetween. On the inner wall portion 2h, there is a second engaging portion 2i that engages with the bracket 1k of the injection pipe 1i to prevent upward movement of the tank body 2a.
is provided.

As shown in FIG. 2, the first engaging portion 2g is formed by recessing an inner wall surface 2f located downward from the vicinity of the upper end of the protruding portion 1d when viewed from the front of the vehicle body in the width direction of the vehicle body. A locking surface 2j that protrudes in the width direction of the vehicle body is formed above the locking surface 2j.
is brought into contact with the upper end of the protruding part 1d via the bush 6 fitted into the protruding part 1d, thereby restraining the downward movement of the front part of the tank body 2a. The bush 6 is made of an elastic material such as synthetic rubber and is shaped like a cylinder with a head, and is connected to the vehicle body frame 1 and the fuel tank 2.
Absorbs impact forces and dimensional errors that occur during the process.

As shown in FIG. 4, the second engaging portion 2i is a projecting piece 2k that protrudes from the inner wall of the groove portion 2c and extends parallel to the lower side of the bracket 1k of the injection tube 1i.
U that opens at the front and inserts the injection tube 1i from the front.
A letter-shaped cutout 2l is formed, and the cutout 2l
It comes into contact with the lower surface of the bracket 1k via a substantially U-shaped rubber bush 7 attached to the edge of the tank body 2a, thereby restraining the upward movement of the tank body 2a.

The through hole 2d is elongated in the longitudinal direction of the vehicle body. The rear mounting portion 2e is made of an elastic material such as rubber, and is brought into contact with the vehicle body frame 1 via a grommet 8 fitted into the through hole 2d, and is fixed to the vehicle body frame 1 with bolts 9 so as to be attached to the tank body. The vertical and horizontal movements of 2a are restrained.

In the above embodiment, the protruding portion 1d of the vehicle body frame 1 and the first engaging portion 2 of the fuel tank 2
g is engaged through the bush 6,
It is also conceivable to directly fit the two together without using the bush 6. Further, as shown in FIGS. 7 and 8, the first engaging portion 2g has a U-shape that opens a part of the inner wall portion 2f toward the front end when viewed from the side of the tank body 2a. It may be formed into a concave shape, and the concave portion may be fitted into the protruding portion 1d of the vehicle body frame 1 from the rear of the vehicle body.

Furthermore, the mounting structure of the rear part of the fuel tank 2 is not limited to the above-mentioned embodiment, and as shown in FIG. B and rubber band C
Any structure may be used as long as it can prevent the fuel tank 2 from moving upward and rearward.

As explained above, the fuel tank mounting structure of the present invention has an injection pipe projecting upward from the upper surface of the hollow upper pipe connected to the head pipe, so that the inside of the upper pipe serves as a liquid storage section, and In a motorcycle in which a fuel tank made of synthetic resin is arranged at the upper part of an upper pipe behind the injection pipe, a bracket is attached to the injection pipe, and protrusions that protrude to the left and right sides of the upper pipe are provided near the injection pipe. On the other hand, the fuel tank includes a tank body serving as a container, and a first engaging portion located at the front lower part of the tank body and engaging with the protrusion to restrain downward movement. A second tube located at the center of the front part of the tank body in the width direction and engaged with the bracket of the injection pipe to restrict upward movement.
The first engaging part and the second engaging part are respectively engaged with the bracket and the protruding part of the vehicle body frame to attach the fuel tank to the vehicle body frame. The vertical positioning of the front part of the front part can be reliably and firmly established. Furthermore, since the fuel tank is integrally molded from synthetic resin, there is no need to separately form a member for engagement with the vehicle body, which reduces the number of components and facilitates assembly.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the present invention, in which Figure 1 is a side view of a motorcycle to which the present invention is applied, Figure 2 is a sectional view taken along the - line in Figure 1, 3 is a sectional view taken along the - line in FIG. 1, FIG. 4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is a sectional view taken along the - line in FIG. Figure 1 -
7 is a side view of essential parts of another embodiment of the present invention, FIG. 8 is a sectional view taken along the - line of FIG. 7, and FIG. 9 is a view of still another embodiment of the present invention. FIG. 2 is a partially omitted side view of the embodiment. DESCRIPTION OF SYMBOLS 1...Vehicle frame, 2...Fuel tank, 6...Bushion, 1b...Upper pipe, 1c...Reinforcement plate (gusset), 1d...Protrusion part, 1g...Thread part, 2a...Tank body, 2b, 2c...Groove part, 2e... rear mounting part,
1i... Injection tube, 1k... Bracket, 2g... First engaging part, 2i... Second engaging part, 2j... Locking surface, 2
k... protrusion, 2l... notch.

Claims (1)

[Scope of utility model registration request] In a motorcycle having a filler tube protruding upward from the top surface of a hollow upper pipe connected to a head pipe, the interior of the upper pipe serving as a liquid storage section, and a fuel tank made of synthetic resin disposed on the upper part of the upper pipe behind the filler tube, a bracket is attached to the filler tube, and protruding portions protruding to the left and right sides are attached to the upper pipe near the filler tube, while the fuel tank is
a fuel tank mounting structure for a motorcycle, characterized in that a tank body serving as a container, a first engagement portion located at the front lower part of the tank body and engaging with the protrusion to restrain downward movement, and a second engagement portion located at the center of the width of the front part of the tank body and engaging with a bracket of the filling pipe to restrain upward movement, are integrally formed.