JPS60107421A - Intake apparatus for riding-over type car - Google Patents

Abstract

PURPOSE:To suppress the height of a seat low by arranging a carburetor connected to the upstream edge of a suction pipe, in front of the front edge top surface of a cylinder head, thus securing the min. ground height of a 4-wheel motor-cycle. CONSTITUTION:The cylinder 17 of an engine 16 is tilted forward nearly to the horizontal state. Therefore, the upper surface of a crankcase 18, of course a cylinder head 19, can be set close to a frame member 3, and the whole installation position of the engine 16 can be raised, and the min. ground height can be secured sufficiently. Further, the necessity of arranging a carburetor 22 and an air cleaner box 26 under a seat 13 is avoided by leading-out forward an intake pipe 21 connected to a suction port 20. Further, the caburetor 22 is arranged in front of the engine 16. Therefore, the traveling wind can be received sufficiently, and the thermal influence due to the engine 16 can be reduced, and the freedom in installation position for the air cleaner box 26 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a riding type vehicle such as a tricycle or a four-wheeled motor vehicle that travels on rough terrain, and particularly to the layout of an intake system thereof.

[Technical background of the invention and its problems]

As this type of vehicle, a frame member extending rearward is connected to the steering head part that supports the front wheel steering mechanism, and the engine is placed below this frame member! At the same time,
It is known that a seat is installed above the rear of the engine. By the way, in order to keep the seat height low in such a configuration, it has been considered that the engine cylinder is tilted forward to almost horizontal position. In this case, if the carburetor is placed above or behind the cylinder, a space is required to accommodate the carburetor and air cleaner between the engine and the frame member, so the mounting position of the engine must be lowered by a certain degree. Problems such as lower minimum ground clearance arise. At the same time, the carburetor and air cleaner fit under the seat, so the seat must be installed at a higher position (or rather, the seat height becomes higher).

[Purpose of the invention]

The present invention was made based on these circumstances, and
The entire engine can be mounted close to the upper frame member, ensuring sufficient minimum ground clearance, and there is no need to place intake system parts such as a carburetor under the seat. The purpose of the present invention is to provide an intake device for a riding type vehicle that can keep the height low.

[Summary of the invention]

That is, in order to achieve the above object, the present invention rotates the cylinder of the engine forward and tilts it forward approximately horizontally, rotates the intake pipe connected to the intake port of the engine forward and leads it out, and also directs the intake air of the intake pipe. The vaporizer connected to the upstream end,
It is characterized by being placed forward of the front end corner face of the cylinder head.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on drawings in which the present invention is applied to a four-wheeled motor vehicle.

In the figure, reference numeral 1 denotes a frame, and a plate-shaped steering head portion 2 at the front end of the frame is connected to a frame member 3 having a square/branch shape extending rearward. Left and right support pipes 4, 4 that extend downward are connected to the joint between the steering head section 2 and the frame member 3, and the lower ends of these support pipes 4.4 expand in the left-right direction. The front axle 5 is inclined between these lower ends.
is suspended horizontally. Left and right front wheels 6.6 are connected to both ends of the front axle 5 through kingpins (not shown) so that they can be steered in the left-right direction. Further, a steering shaft 8 constituting a front wheel steering mechanism 7 is rotatably attached to the center of the front surface of the steering head section 2. The steering shaft 8 is rotated by a par handle 9,
Although not shown in detail, this rotational movement is converted into a rocking movement in the left-right direction by the tie rod and the front wheel shaft arm, and is transmitted to the front wheels 6.6, whereby the front ends 6, 6 are simultaneously steered.

On the other hand, the frame member 3 is bent downward from the middle, and the gear case of the rear axle 10 is connected to the rear end thereof, and left and right rear wheels 11 and 11 are connected to both ends of the rear axle 10. installed. Left and right seat rails 12' and I2, which extend rearward and approximately horizontally, are connected to the bent portion of the frame member 3, and the driver is seated in a straddling position on these seat rails 12.12. A seat 13 is installed. A fuel tank 14 is installed between the seat 13 and the par handle 9, and this fuel tank 14 is fixed on the front half of the frame member 3.

Further, from the front axle 5, left and right underpipes 15.15 are turned rearward and led out approximately horizontally, and these underpipes 15, 15 are raised just in front of the rear axle 10 and are extended to the seat rail 12.12. is connected to the rear of the

A four-stroke single-cylinder engine 16 is mounted below the frame member 3, that is, in a space surrounded by the frame member 3 and the engine and engine 15.15. Above the sheet 13
is located. The cylinder 17 of the engine 16 rotates forward with respect to the crankcase 18 and is tilted forward approximately horizontally. Therefore, the crankcase 18, the cylinder 17, and the cylinder head 19 connected to the front end of the cylinder 17 are approximately attached to the frame member 3. They are located close together. The intake pipe 2 connected to the intake port 20 on the upper surface of the cylinder head 19 is connected to the cylinder head 19 and the frame member 3.
The carburetor 22 connected to the upstream end of the intake air is located forward of the top surface 23 of the cylinder head 19, which points forward, and its float case 24 is connected to the top surface 23 of the cylinder head 19. It is closely opposed to the upper part of the surface 23. An air cleaner pipe 25 is connected to the intake upstream [] of the carburetor 22, and this air cleaner box 2
5 above-10,000 support iJ? Eve 4 and steering shaft 8
The air cleaner box 26 is connected to the air cleaner box 26 disposed in front of the steering head section 2. A suction port 27 is provided at the center of the rear surface of the air cleaner box 26, and the outside air sucked through the suction port 27 passes through an element 28 and then passes through the air cleaner box 26.
It is led to the vaporizer 22 through the ear 25.

In FIG. 1, the reference numeral 29 indicates a battery disposed under the seat 13, and the reference numeral 30 indicates a footrest.

According to such a configuration, the cylinder 17 of the engine 16
I tilted it forward to almost horizontal, so this shilling 17
By bringing the upper surface of the crankcase 18, as well as the cylinder head 19, closer to the frame member 3, the mounting position of the entire engine 16 is raised, so that a sufficient minimum ground clearance can be ensured.

Furthermore, by leading the intake pipe 21 connected to the intake port 20 forward, the carburetor 22 can be connected to the top surface of the cylinder head 19.
3. In other words, since they are located forward of the front end of the engine 16, there is no need to dispose the carburetor 22 and the air cleaner pix 26 under the seat 13. Therefore, there is no need to secure a large space under the seat 13, so even if the engine 16 is brought closer to the frame member 3, the mounting position of the seat 13 can be lowered, and the seat height can be kept low. In this case, since the space under the seat is not occupied by the carburetor 22 or the air cleaner box 26, it can be effectively used as a space for storing the battery 29, other accessories, and electrical components.

Furthermore, since the carburetor 22 is located in front of the engine 16, it is easily exposed to the wind while the car is running, which reduces the effect of heat from the engine 16.
6. The degree of freedom in the installation location increases. In other words, since this type of four-wheeled motor vehicle often travels through wetlands, it is necessary to take waterproof measures for the intake system, but as mentioned above, the carburetor 22
If it is placed in front of the engine 16, the outside air intake port 27
The air cleaner equipped with this allows the TUX 26 to be easily placed near the steering head section 2 which is higher than the seat 13.
There is no need for special waterproofing measures like in conventional snorkel structures.

In the above-mentioned embodiment, the intake port connected to the intake pipe is provided on the top surface of the cylinder head, but it is also possible to provide the intake port on the side surface. It's also beautiful.

Furthermore, the vehicle according to the present invention is not limited to a four-wheeled motor vehicle, but can be similarly applied to a three-wheeled motor vehicle having one front wheel.

〔Effect of the invention〕

The present invention (F twist) described in detail above allows the engine to be mounted closer to the upper frame member, so the engine can be mounted at a higher position, ensuring sufficient minimum ground clearance.Moreover, the intake system such as the carburetor can be Since there is no need to place the engine under the seat, the mounting position of the seat can be lowered even if the engine is moved closer to the frame member, which has the advantage of keeping the seat height low.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, with FIG. 1 being a partially sectional side view and FIG. 2 being a partially sectional front view. 2... Steering head portion, 3... Frame member, 7... Front wheel steering mechanism, 16... Engine, 17°
°° cylinder, 19°°° cylinder head, 20°...
Intake port, 22... Carburetor, 23... Top surface.

Claims (1)

[Claims] In a riding-type vehicle in which an engine is disposed below a frame member extending rearward from a steering head section that supports a front wheel steering mechanism, and a seat is disposed above the rear part of this engine, the cylinders of the engine are placed at the front as well. The engine is tilted forward approximately horizontally, and the intake pipe connected to the intake port of this engine is routed forward, and the carburetor connected to the upstream end of this intake pipe is placed forward of the top surface of the front end of the cylinder head. An intake system for a riding type vehicle, characterized by the following.