JPH0742946Y2 - Motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a motorcycle having an engine unit as a part of a frame.

(Prior Art) A motorcycle has a frame constructed by pipes,
It is common that an engine unit is mounted in the center of the structure. As a special one, there is one in which an engine unit is used as a part of a frame to simplify the frame structure (for example, Japanese Patent Publication No. 58-49435 and Japanese Patent Laid-Open No. 62-49435).
-103284).

On the other hand, various auxiliary devices are required for the engine, and examples of those having a large volume include a fuel tank and an air cleaner case. Although these are arranged by effectively utilizing the limited space, they are likely to be extremely cramped in order to secure a sufficient volume. The air cleaner case of the above-mentioned JP-A-62-103284 is one in which a box portion is formed in a part of a frame attached to an engine unit to support a steering post and an element is loaded therein.
In the case of a general frame structure, it is disclosed in JP-A-60-22988.
As shown in No. 2, there is a box-type strength member behind the head pipe that uses an air cleaner case.

All of these can use the dead space and are effective in the layout of the motorcycle. However, since the carburetor is far from the engine, the intake pipe becomes long, which is disadvantageous in terms of piping, intake resistance, and intake noise.

(Problems to be solved by the invention) As described above, in the conventional motorcycle in which the air cleaner case is arranged by effectively utilizing the dead space around the steering head, many problems remain in connection with the carburetor. In view of this, the present invention makes the engine unit and the air cleaner case part of the frame, absorbs the carburetor in the frame, and expands the effective use of the space.
Automatic 2 that suppresses inhalation noise and adjusts appearance
Aim to get a wheeled car.

Another object of the present invention is to improve disassembly and maintenance of the front fork.

[Constitution of device]

(Means for Solving the Problems) With the above object, the motorcycle of the present invention is a motorcycle in which an engine unit is part of a frame. The box type frame is covered with the head cover upper surface so that the open surface is closed, and fixed to the engine unit, whereby the inside of the box type frame is utilized as an air cleaner case containing the carburetor, and A steering head for supporting a front fork is fixed to the front part in a disassembleable manner.

(Operation) With this configuration, the box-shaped frame forms an airtight chamber on the upper surface of the head cover of the engine unit, which is utilized as an air cleaner case for accommodating the carburetor mounted on the upper surface of the head cover. That is, the dead space from the upper part of the engine unit to the steering head is fully utilized, and a large capacity air cleaner case can be obtained.

In this way, by housing the carburetor in the box-type frame, clean atmospheric air can be directly sucked in without piping, and the appearance can be simplified and a space can be obtained above and behind the engine unit. It can be extended to increase the dose.

On the other hand, the steering head that supports the front fork is fixed to the front part of the box-shaped frame so that it can be disassembled, so it fits well in the layout. The front fork can be removed from the car body without disassembling the car. For this reason,
The front fork, front wheel, handle, and other parts around the front fork can be dramatically disassembled and maintained.

(Embodiment) FIG. 1 is a side view of a motorcycle showing an embodiment of the present invention.
In this motorcycle, an engine unit 1 arranged at the center of the vehicle body forms the core of the frame, and front and rear wheels 2 and 3
Will be deployed.

The front end of the swing arm 4 that supports the rear wheel 3 is pivotally supported by the rear edge of the engine unit 1, and is suspended by a rear cushion unit 5 also mounted on the rear edge of the engine unit 1. Seat rail 7 on which the seat 6 is placed
And the seat pillar 8 supporting this is attached to the upper rear edge of the engine unit 1. A fuel tank 9 is arranged in front of the seat 6.

Next, the front fork 10 for suspending the front wheels 2 is a box-type frame 11 connected to the front upper part of the engine unit.
Steeringly supported on the front part of the vehicle via a steering head 12. 13 is the front cushion unit, and 14 is the handle.

As shown in FIGS. 2 and 3, the box type frame 11 is a box type having openings 15 and 16 on the upper surface and the lower surface, and the steering head 12 is fixed to the front surface by a fastening bolt 17 so as to be disassembled. It Further, attachment legs 18 are provided on both sides of the lower surface.

In the engine unit 1, the engine portion extends forward and upward,
The head cover 1b attached to the cylinder head 1a is provided with a rib 19 surrounding the upper surface peripheral portion. Further, as shown in FIG. 4, the intake passage 21 opening to the combustion chamber 20 of the cylinder head 1a extends right above along the axis of the cylinder 22, penetrates the head cover 1b, and opens on the upper surface thereof. Then, the carburetors 23 connected to the intake passage 21 are arranged on the upper surface of the head cover 1b.

The box-type frame 11 has the attachment legs 18 and the fastening bolts 24
The engine head 1 is connected to the engine unit 1 by being fastened to both side surfaces of the cylinder head 1a. At this time, the opening
The inner flange 25 of 16 parts and the above-mentioned rib 19 are joined via the sealing material 26, the opening 16 is closed by the head cover 1b, and the carburetor 23 is housed in the box-type frame 11.

An air cleaner element 27 is covered on the opening 15 on the upper surface of the box-type frame 11, and a cap 28 is further covered. An inlet 29 opens in the cap 28. The fuel tank 9 is continuously connected behind the cap 28.

In this way, the inside of the box type frame 11 together with the cap 28,
It is used as an air cleaner case containing the carburetor 23. The air sucked from the inlet 29 is purified through the air cleaner element 27, enters the box-shaped frame 11, and is sucked into the carburetor 23 from the air funnel 30 opening inside.

When the motorcycle is constructed in this way, the large dead space from above the engine unit 1 to the steering head 12 becomes a large capacity air cleaner case as it is, and the carburetor 23 is housed inside the box type frame 11 as this air cleaner case. As a result, the space above the rear of the engine unit 1 where the carburetor and the air cleaner are conventionally arranged is large. Therefore, for example, by extending the fuel tank 9 in this portion, the tank capacity can be increased and the space can be effectively used.

Moreover, since it is not necessary to connect the intake pipe between the air cleaner case and the carburetor as in the conventional case, the configuration around the carburetor 23 is greatly simplified and the appearance is simplified, and the intake resistance by the intake pipe is also reduced. There will be nothing. Further, due to the rigidity of the box-type frame 11 and the presence of the uneven surface due to the built-in carburetor 23, the suction noise of the carburetor 23 can be significantly suppressed.

On the other hand, since the steering head 12 is fixed to the front of the box-shaped frame 11 so that it can be disassembled, the layout fits well, and if the steering head 12 is separated from the box-shaped frame 11, the bearing portion of the front fork 10 is separated. The front fork 10 can be removed from the vehicle body without disassembling the car. Because of this, the front fork
Front fork such as 10, starting with 2, front wheel 2, handle 14, etc.
The dismantling and maintainability around 10 is dramatically improved.

[Effect of device]

As described above, the motorcycle according to the present invention is a motorcycle in which an engine unit is part of a frame, and in which the carburetor is mounted on the upper surface of the engine head cover and the box-shaped frame with the lower surface opened is used. It covers the upper surface of the head cover so that the open surface is closed, and is fixed to the engine unit, so that the inside of the box type frame is used as an air cleaner case containing the carburetor and the front part of the box type frame is used to support the front fork. The steering head is fixed so that it can be disassembled.

In this way, the entire dead space from the upper part of the engine unit to the steering head can be used very effectively as an air cleaner case, and the capacity of both the air cleaner case and the fuel tank can be increased.

Moreover, since it is not necessary to connect the carburetor and the air cleaner case with the intake pipe as in the past, there is no difficulty in the intake pipe piping, and the intake resistance can be reduced, and at the same time the appearance is simplified. it can. Further, since the carburetor is housed in the box type frame having high rigidity, the intake noise is greatly suppressed.

Furthermore, since the steering head that supports the front fork can be separated from the box-shaped frame, it is possible to remove the front fork from the vehicle body without disassembling the bearing part of the front fork. For example, the ease of disassembly and maintenance around the front fork is dramatically improved.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle showing an embodiment of the present invention,
2 is an enlarged sectional view of the steering head portion taken along the line AA in FIG. 1, FIG. 3 is an enlarged vertical side view of the box-type frame shown in FIG. 1, and FIG. 4 is shown in FIG. FIG. 7 is a further enlarged vertical side view of the engine unit cylinder head portion. 1 ... Engine unit, 1a ... Cylinder head, 1b ...
... head cover, 2 ... front wheel, 3 ... rear wheel, 6 ... seat, 9 ... fuel tank, 10 ... front fork, 11 ...
… Box type frame, 12… Steering head, 1
5,16 …… Opening, 21 …… Intake passage, 23 …… Carburettor, 27
…… Air cleaner element, 28 …… Cap, 29 ……
Inlet.

Claims (1)

[Scope of utility model registration request] 1. In a motorcycle having an engine unit as a part of a frame, a carburetor is mounted on an upper surface of an engine head cover, and a box type frame having an open lower surface is covered with a head cover so that the open surface is closed. By covering it on the upper surface and fixing it to the engine unit, the inside of the box type frame was used as an air cleaner case containing the carburetor, and the steering head for supporting the front fork was fixed to the front part of the box type frame in a disassembled manner. A motorcycle that is characterized by that.