JPS62216884A - Car body structure of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a body structure for a motorcycle that includes a main frame made of pressed sheet metal and extending rearward from a steering shaft tube.

In conventional technology motorcycles, the cross section is approximately channel-shaped,
A pair of left and right pressed sheet metal frames are half-dead! It is fixed to the main frame to form the main frame, and this main frame is equipped with the front rear wheels, engine, auxiliary equipment, and other parts that make up the L-car. The front parts of the frame half-rest are fixed to each other under -L, and the cross-sectional shape of the frame is configured to be a closed cross-section.This closed cross-section structure increases the rigidity of the main frame made of sheet metal press. I try to keep it.

Some motorcycles with this type of frame structure have a structure in which a fuel tank or oil tank is built into the inner space at the front of the main frame.

Problems to be Solved by the Invention When a fuel tank or an oil tank is incorporated into a main frame having a closed section structure as described above, the rear part of the main frame is made open, and the fuel tank or oil tank is inserted from this rear open part. The L method of inserting and installing is adopted.

However, according to this installation structure, the tank is inserted into the frame from a very narrow space surrounded by a half-closed part of the frame, and after being inserted to the designated position, the assembly work is carried out inside the completely closed inner space. If you have to, the work is extremely tedious and requires time and effort. Therefore, it may be possible to open the upper surface of the frame and insert the tank from the lower surface (Ill).In this case, the rigidity and strength of the frame becomes an issue.The present invention was created in view of the above points. The purpose is to simplify the installation of fuel tanks and oil tanks into the interior of the main frame made of sheet metal presses, and at the same time improve the rigidity of the frame.

Means for Solving the Problems To achieve this object, the present invention provides a motorcycle body structure in which a fuel tank and an oil tank are incorporated in the front interior of a main frame made of sheet metal press.
The front part of the main frame has a substantially channel-like open cross-sectional shape that opens downward.
- A structure is adopted in which both side edges are fixed to the open end edges of the frame.

According to the structure of the present invention, by fixing the right side edges of the opening of the main frame ll' 11 part (the tank is inserted from the bottom part) to the opening edge of the frame, respectively. , the tank is mounted inside the front part of the main frame. Therefore, the tank can be easily assembled into the interior of the main frame. Furthermore, when the tank is attached to the main frame +lif section having an open cross section, the front part of the main frame becomes a highly rigid closed cross section shape due to the bodies of the left and right frames 1 constituting the main frame and the bottom of the tank. Furthermore, the opening of the frame and the bottom side edges of the ri/ri [
-] The frame is reinforced by the connection with the edge 81. Therefore, the rigidity of the main frame having an open cross-sectional shape is maintained.

Embodiments Now, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a motorcycle with a foot pedal according to the present invention, FIG. 2 is a perspective view showing its body frame, FIG. FIG. 4 shows a sectional view taken along the line ■-n in FIG.

The body frame 11 of the motorcycle 10 with a foot pedal has a diamond frame structure in which a main frame 12, a moving crab knit 13, and a rear arm 14 are integrally bolted together.

The main frame 12 is formed by fixing a pair of left and right frame halves 121 and 122 made of sheet metal presses to each other, and a head pipe portion 15 is fixed to the tip thereof. The left and right frames 'l/ and bodies 121 and 122 are press-molded into a substantially channel shape with the upper and lower ends turned inward to face each other, and from the intermediate part in the longitudinal direction of the vehicle, The front upper part of the frame is fixed by spot welding at each folded end, and the top of the frame is closed. In this way, the main frame 12
) 1; For part 5, fold the left and right frames back to the 1-north of body 121.122! It is formed into a generally channel-like open cross-sectional shape that is fixedly closed and opened downward. Left and right fretboards that make up the main frame 12, body 1
21 and 122 are press-molded into an upwardly convex, generally arched shape extending diagonally downward and rearward from the head vibrator 15 at the front end, and the rear portions thereof are spaced apart from each other to form an A-shaped shape. End plates 16, 16 are fixed to the rear ends of the left and right frame top bodies 121, 122. A driver seat indicating metal fitting 17 is provided in the middle of the main frame 12 and is fixed to the left and right frame half-rests 121 and 122. A vertically long moving crab knit 13 is arranged below the center of the main frame 12. The part of the moving crab knit 13 is sandwiched between the left and right frames 121 and 122, and is located under the center of the main frame 12. ■It is bolted to ζ from both sides. Dokantsu of dynamic crab knit-13 and frame λ1 side body 12L End plate 1 fixed to the rear of L22
6.16, a pair of left and right rear frames i4. L4
or has been constructed. One end of the rear frame 14 is fixed to the second plate 16, and the other end is bolted to the upper part of the moving crab knit 13.

In this way, the vehicle body frame 11 is a power unit.

It has a diamond frame structure in which the main body case of 13 is part of the frame.

The members constituting the vehicle body frame 11 are connected by welding and bolting. Main frame 12
An opening 123 (b) is formed near the front end of the upper part thereof and opens on two sides. This opening [TIA(i 12
4 of the main frame 12 before and after the stay 1.
24.125 is installed. This stay 124
, 125 are used as aids for attaching and detaching the top cover 18, which is provided to cover the upper front part of the main frame 12. The top cover 18 is attached so as to be openable and closable about a hinge 18L 181 so as to cover the upper surface of the main frame 12 extending up to the head vibrator 15.The front end of the top cover 18 is 7-1 to stay 124 by t'F theory part 182
removable: kotorij) attached.

Main Flare L, 12 fire inside the front part) 1 night/hour 2Q
h) I□"It is inserted through the section 11 and installed.
It is formed of a box-shaped airtight container 201.

A single non-projecting nozzle 202 that projects rearward is provided below i2t on each end side 1. Bottom m of fuel tank 20
9203 has a flange portion 204 extending outwardly or a peripheral edge 1. ', is formed along I. Fuel reception L-1
A cap 21 is attached to the.

The fuel tank 20 is attached to the main frame 1 as follows.
It is attached to the front inner space of 2.

First, the fuel tank 20 is inserted and assembled from the upper opening of the main flares 1 and 12. At that time, align the intake port 201 of the fuel tank 20 with the opening DfflS123 at the end of the main frame 1. Fuel tank 20 bottoms 1 tank full /) Death 204
Overlap. During this overlapping, the lower edges 121 and 122 of the frames are toss-folded, the nuts 100 are fixed in advance to the inside of the mesh 1, and the mounting holes 205 formed in the flange portions 204, . Align. Then, from above the frame, bolt 101. ---
is tightened and the flange portion 204 is bolted to the lower edge of the frame, and the fuel tank 20 is attached to the interior of the +) ii portion of the main frame 12.

When the fuel tank 20 is attached to the inner space of the main frame 12 in the above manner, the bottom surface of the main frame 12 having an open cross section is closed with the bottom of the tank, and the front part of the frame is The side faces 121 and 122 and the bottom 81 and 203 of the fuel tank 20 form a closed cross-sectional shape in which both the two F faces are closed. The frame 12 is reinforced by bolt connections between the left and right lower edges and the flange portion 204 at the bottom of the tank. With this reinforcement and closed cross-sectional shape,
The rigidity of the frame 12 is increased.

The fuel tank 20 may be made of iron plate or resin. Alternatively, a configuration in which a resin container is bonded to a metal plate exclusively for iron materials may be used. If the entire circumference is made of iron plate and the fuel tank is shaped, it is possible to adopt a structure in which it is attached to the inside of the 1air section of the main frame 12 by melting instead of being connected by bolts.

Injection of fuel into the fuel tank 20 is performed by the main frame 12.
of. Open the top cover 18 provided with the -[-
This is done by removing the cap 21 of the receiving port 201 located at the 81ζ open L1 portion 123.

Next, the overall configuration of the motorcycle 10 with a foot pedal will be described.

A steering shaft 30 at the front end of the main frame 12 is rotatably rotated in the steering direction of the steering wheel. 31 is provided.1liT fork 31 is provided with tlii
The iii shaft 321 of the shaft 32 is supported. A front fender 33 is provided above the 1111 port 32 to cover the rear and upper side from one of the front wheels 32. 1. Sumikosuke 30
A bar hand 35 is supported at the end of the bar via a handle bracket 34. Handle bracket 34
1] An IR light 53 is attached to the.

On the other hand, the end plate 18 at the rear end of the main frame 12
．． 18 supports a rear wheel 36. The driver's seat support 3"↓17 provided in the middle part of the main frame 12 is supported so that it can be adjusted to a height of 7-) 37 or 1 degree. The left and right frames of this main frame 12 The middle part of the body 121.122 is the rear fender 3
The ~/end of 8 is fixed. The rear fender 38 extends rearward from the intermediate portion of the main frame above the rear wheel 36, and covers the rear wheel 36 in the t direction. rear fender 3
At the rear end of the 8 is a tail light 39. Temporary mudguard 40. direction indicator light 4
1. A license plate 42 is attached.

The movable crab knit 13 provided at the lower center of the main frame 12 is equipped with an air-cooled two-stroke engine 131 at the top and a foot pedal 132 at the bottom.

In the power unit 13, the output of the engine 131 is connected to a flywheel magneto 133, a centrifugal clutch 134.
The signal is transmitted to the crank gear 43 via the reduction gear 135.

Further, the rotational power generated by the foot operation of the foot pedal 132 is transmitted to the crank Yamanaka 4 via a one-way clutch (not shown).
3. A chain 46 is wound around a crank shaft 43, a +W iti 44 provided integrally with the rear wheel 36, and a derailleur 45. The engine output and the rotational output by the foot pedal 132 can be controlled by both together or independently by %1lk13.44. The signal is transmitted to the rear wheels 36 via the chain 46, and the rear wheels are driven. rear wheel 3
The southeast 44 installed in the
An external transmission is comprised of a companion ii iff 44 and a derailleur 45 consisting of a pair of small diameter gears.

The power sources 22 and 13 are covered substantially all around by an engine cover 47. An air purifier 48. Auxiliary equipment such as a carburetor 49 and an oil tank 50 are provided. A fuel supply pipe 206 extending from the nozzle 202 of the fuel tank 20 mounted inside the frame 12 as described above is connected to the carburetor 49. The carburetor 49 is connected to one intake port of the engine 131. An exhaust pipe 51 is connected to the 1/1 air [ ] of the engine 131 . The exhaust pipe S1 is connected to an exhaust muffler 52 installed inside the rear fender 38.

Automatic 2 Gifl with foot pedal configured in this way
At O, various operating levers are arranged around the handlebar for operating the slot of the engine 131, shifting the external transmission, braking the rear brake (not shown), etc. Wires pulled out from these operating levers.

Wire harnesses A, such as lead wires for electrical system connections, are guided from around the handle into the interior of the main frame through an insertion hole 126 formed near the front end of the side of the main frame.
The wires are routed along the inner wall to a predetermined position at the rear of the vehicle. A rubber bush 19 is attached to the insertion hole 126 to prevent damage to the lead wires among the wire harnesses A. The wire harness A to be passed through the insertion hole 126 is inserted into the frame 1 as shown in FIG.
It is routed rearward through the space formed between the four bodies 121, 122 and the fuel tank 20, or between the two sides of the main frame 12 and the cover 18, and along the inner wall of the frame. It is wired to a predetermined location where the external transmission, battery, etc. are located.

When the fuel tank 20 is attached to the main frame 12 by bolt connection, the wire harnesses A have an open cross-section structure that opens upward from the main frame 12. Can be wired and assembled at the same time. According to this, since the wire harnesses are wired in the frame at the same time as the fuel tank is attached to the frame, assembly to the frame can be performed more simply.

In the embodiment L, the case where the fuel tank 20 is installed inside the frame 12 has been described, but the present invention can also be used when the oil tank 50 is installed inside the frame with the same configuration as described above. Wear. In that case,
It is also possible to integrate the oil tank 50 with the fuel tank.

Furthermore, in the embodiments, the present invention has been described as being applied to a motorcycle with a foot pedal, but it can also be applied to other automatic knee and wheeled vehicles without pedals with the same configuration.

As described in detail, according to the present invention, the main frame 1.
The front part of the main frame has a cross-sectional shape that opens downward, and the tank is inserted through the lower opening of the main frame and assembled and installed, so the tank can be installed on the main frame on surface q1, and the installation is easy. Work can be facilitated and workability can be improved. When a tank is installed inside the main frame, the lower surface of the main frame, which has an open cross-section, is closed at the bottom of the tank, and in combination with the tank, the frame becomes a strong closed cross-section. Furthermore, the frame is reinforced by being connected to the tank. Therefore, the rigidity of the main frame having an open cross-sectional shape is increased, and a strong frame structure can be obtained.

tl, Explanation in f'ffl of the drawings 11th and 1 are O+lI diagrams showing a small automatic wheeled vehicle with a foot pedal according to the present invention, the front view is a perspective view showing the insect body frame, and Figure 3 is a The small body frame 11; 10...
Motorcycle i1L with foot pedal, 11-...11 (body frame, 12...φ main frame, 13 skewer/fisted crab knit, 14...rear frame, 18...top cover, 20-...fuel tank , 32...ilt wheel, 36...rear wheel, 43.44...
I tooth LIE, 46... Chain, A11 tatami - Wire harnesses.

Claims (2)

[Claims] (1) In a motorcycle body structure in which a fuel tank or an oil tank is built into the interior space of the front part of a main frame made of sheet metal press, the front part of the main frame has a substantially channel-like open cross-sectional shape that opens downward; A body structure for a motorcycle, characterized in that both side edges of the bottom of the tank inserted into the frame through the lower opening are fixed to the opening end edges of the frame, respectively. (2) The vehicle body structure of a motorcycle according to claim (1), wherein the fixing means is welded or bolted.