JPH0478680A - Motorcycle - Google Patents

Abstract

PURPOSE:To enlarge the purging capacity of an air cleaner so as to contribute to the performance improvement of an engine by forming an intake system of a carburetor disposed upward to the rear, and an air cleaner between a pair of center frames. CONSTITUTION:In this motorcycle, an intake system In connected to an intake port 19 is disposed behind a multiple cylinder engine E mounted horizontally to a body frame F, and the body frame F is formed of a main pipe 8 connected to a head pipe 1 and extended upward, and a pair of center frames 10 connected to the rear end of the main pipe and extended backward being branched later ally into the fork state. The intake system in is formed of a carburetor Ca connected to the intake port 19 and disposed upward to the rear, and an air cleaner Ac disposed above a transmission part 18. The upper part of the air cleaner Ac is disposed between a pair of center frames 10.

Description

DETAILED DESCRIPTION OF THE INVENTION A3 Object of the Invention (1) Field of Industrial Application The present invention relates to improvement of a motorcycle equipped with a multi-cylinder engine.

(2) Conventional technology Conventionally, a vehicle body frame with front and rear wheels suspended longitudinally, and a multi-cylinder engine mounted horizontally on this vehicle body frame (with its crankshaft perpendicular to the longitudinal direction of the vehicle body frame), A motorcycle comprising an intake system disposed behind the engine and connected to the intake boat is known (see Japanese Patent Laid-Open No. 58-47683).

(3) Problems to be Solved by the Invention In motorcycles, the multi-cylinder engine itself mounted on the body frame is large and occupies a large space, so there is space to accommodate the intake system connected to it. However, there are inherent limitations, and in particular, air cleaners with a relatively large capacity are forced to reduce their capacity.

The present invention was developed in view of the above circumstances, and it is possible to secure the space occupied by a large-capacity air cleaner, and also to shorten the length of the entire intake system, making it possible to improve the layout and installation of other equipment. The purpose of the present invention is to provide a new motorcycle that can increase the degree of freedom.

B0 Structure of the Invention (1) Means for Solving the Problems To achieve the above object, the present invention provides a vehicle body frame in which front and rear wheels are suspended longitudinally, a multi-cylinder engine mounted laterally on the vehicle body frame, In the motorcycle, the body frame includes a main pipe connected to the hend pipe and extending rearward, and a rear end of the main pipe. The intake system includes a pair of center frames that are connected to the intake boat of the multi-cylinder engine and are connected to the intake boat of the multi-cylinder engine and are arranged rearward and upward. , an air cleaner disposed above the transmission section of the multi-cylinder engine and communicated with the inlet of the carburetor, and an upper portion of the air cleaner disposed between the pair of center frames.

(2) Effects According to the above configuration, the air cleaner in the intake system of the engine can increase its purification capacity without increasing its longitudinal length, and can contribute to improving engine performance.

Further, the total length of the intake system in the front-rear direction can be shortened, and the degree of freedom in layout and mounting position arranged behind it can be increased.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially longitudinal side view of the motorcycle of the present invention, and FIG. 2 is a partial plan view taken along the line 11-U in FIG. A front fork 2, which suspends a front wheel Wf as usual, is supported on the front fork 1 so as to be steerable, and a rear fork 3 is pivotably supported on a center frame 10, which will be described later, on the body frame F. Support 3. A rear wheel Wr is mounted on this rear fork 3. Said rear fork 30
The lower end of the suspension 4 is connected 5 to the intermediate portion in the front-rear direction. This reaction 4 extends obliquely toward the front, and its upper end is connected 6 to a cross member 7 provided on a seat rail 11, which will be described later, of the vehicle body frame F.

The front ends of a main pipe 8 and a pair of down tubes 9 are joined to a hend pipe L at the front end of the vehicle body frame F. The main pipe 8 extends rearward while descending slightly. - As clearly shown in FIG. 2, the front ends of a pair of center frames 10 are joined to the rear end of the main pipe 8, which are branched into left and right sides. A space S having a substantially triangular planar shape is formed between the pair of center frames 10. The pair of center frames 10 extend downward via an upper curved portion 101, further extend forward via a lower curved portion 10□, and are integrally joined to the down tube 9. As shown in FIG. 1, the hend pipe 1, main pipe 8, center frame 10, and down tube 9 constitute a square closed frame when viewed from the side.

The front end of a seat rail 11 is joined to the upper rear surface of the center frame 10, and the seat rail 11 extends substantially horizontally from the rear. The portions 10□ and 10□ are joined using a knife 12.12.

A water-cooled in-line four-cylinder four-stroke engine E is supported by the down tube 9 and center frame 10 of the vehicle body frame F in a horizontal direction, that is, its crankshaft 13 is supported in a direction substantially perpendicular to the longitudinal direction of the vehicle body frame F.

Next, to explain the support structure, the down tube 9 has a front support bracket 14, and the cross pipe 2930 connecting the left and right center frames 10 has two rear support brackets spaced apart vertically. 15.16
These front and rear support brackets 14 and 15° 16 support the engine E via a rubber mount member. This engine E is seen from the side with down tube 9 and center frame 1.
It is placed in a closed space surrounded by 0.

The water-cooled in-line four-cylinder four-cycle engine E has a cylinder part 17 tilted forward with respect to the vehicle body frame F, and a transmission part 18 extending rearward from the lower part thereof, and is formed in an abbreviated shape when viewed from the side. An intake system In of the engine E is connected to the rear of the cylinder portion 17. Next, to explain the configuration of this intake system In, four intake boats 19 that communicate with each combustion chamber are opened at the back of the cylinder section 17 of the engine E, and a carburetor Ca is connected to each of these ports 19. Connected. A plurality of carburetors Ca are arranged with an inclination toward the rear, and the mission section 1 of the engine E is connected to the population 20 of the carburetors Ca.
The outlet of the air cleaner Ac disposed on the air cleaner 8 is communicated with the air cleaner Ac. This air cleaner AC is formed to have a large capacity and is supported by the vehicle body frame F in order to obtain sufficient purification ability.

The cleaner case 23 of the air cleaner Ac has its left and right sides connected to a pair of center frames 10 as shown in FIG.
The upper portion thereof is accommodated in the space S between the pair of center frames 10. An elbow-shaped air duct 22 is connected to the lower inlet of the air cleaner Ac, and the inlet of this air duct 22 is connected to the vehicle body frame F.
It opens on the side. Further, the outlet of the air cleaner Ac is opened at the front surface of the cleaner case 23, and is communicated with the inlets 20 of the plurality of carburetors Ca as described above. A cylindrical cleaner element 24 is inserted into and out of the upper surface of the opening of the cleaner case 23, and a lid body 25 that closes the upper surface of the opening is provided on the upper part of the cleaner element 24. The upper surface of the body 25 is formed into a cap shape to increase the capacity of the air cleaner Ac.

Main pipe 8 and center frame 10 of body frame F
A fuel tank T is disposed above, and the tank T is supported by the main pipe 8 via a bracket, and its rear end is mounted on a rubber mount 27 at the front of the seat rail 11. The bottom surface of the fuel tank T is brought into contact with the lid 25 via a rubber 28 provided thereon, and the cleaner case 23 can be supported via the lid 25, with supporting means provided outside. You don't need to add it.

Four exhaust pipes 31 are connected to the front of the in-line four-cylinder four-stroke engine E, and these exhaust pipes 31 extend rearward along the down tube 9 of the vehicle body frame F, and their rear ends is connected to the inlet of an exhaust chamber 32, and the outlet of the chamber 32 is connected to the inlet of a silencer 34 via a joint pipe 33.
The outlet of No. 4 is opened to the atmosphere.

The output shaft 35 of the engine E is interlocked with the rear wheel Wr via a horizontal chain transmission 36.

In the front part of the vehicle body frame F, that is, in the down tube 9,
A radiator 38 interposed in a water cooling circuit 37 of the water-cooled four-cylinder four-cycle engine E is supported, and an electric fan 39 is attached to the back of the radiator 38. radiator 3
8 is connected to the edge 28 via a radiator hose 40.
In the middle of the radiator hose 40, the radiator hose 40 is connected to the head.
A thermostat 41 is interposed. Further, the outlet of the radiator 38 is communicated via a suction hose 42 with the inlet of a water pump 43 that is linked to the engine, and the outlet of the water pump 43 is communicated with the cylinder section 17 of the engine E via a discharge pipe 44. Ru. Water pump 4 is operated by engine E.
3 is driven, the cooling water cooled by the radiator 38 is sucked into the water pump 43 through the suction hose 42, and the pressurized cooling water is pumped into the engine E through the discharge pipe 44. . The coolant whose temperature has been raised by cooling the engine E is sent to the radiator 38 through the radiator hose 40, where it radiates heat and is cooled.

Brackets 46.45 are integrally protruded from the lower part of the center frame 10 and the middle part of the rear stay 12, and a step holder 47 is attached to these brackets 45.46.
A front step 48 is supported at the front of the step holder 47, and a rear step 48 is supported at the rear of the step holder 47.
9 is foldably supported.

Se) is supported on the seat rail 11. That is, the bracket 50 protruding from the bottom rear part of the seat Se is coupled to the seat rail 11, and the bracket 50 is connected to the seat rail 11.
The insertion tongue piece 51 protruding from the front bottom of the seat rail 11
It is inserted and supported by a receiving member 52 fixed to the front part of. A cross member 53 is integrally installed horizontally on the rear portion of the seat rail 11, and the rear portion of the seat Se is supported on the cross member 53 via a rubber 54. Further, a rear fender 56 that covers the upper surface of the rear wheel Wr is supported on the cross member 53 using a plurality of mounting bolts 55. A battery housing box 57 is integrally formed at the front of the rear fender 56, and a battery 58 is housed within the box 57.

In addition, in the figure, 60, 61 and 62 are a meter, a headlight, and a horn supported by the front fork 2, and 63 is a rear cowl that covers the rear part of the vehicle body frame.

According to the operation of the engine E, outside air flows into the air cleaner Ac from the air duct 22 and is purified, then distributed and supplied to the four carburetors Ca, where it is mixed with fuel and then supplied to the four cylinders of the engine. Ru.

The upper part of the air cleaner Ac is housed in the space S between the pair of bifurcated center frames 10, and is formed long in the vertical direction to ensure a large purification capacity. Purified air? M number of vaporizer Ca
can be supplied to

In addition, by arranging the carburetor Ca toward the rear and upward, and by forming the air cleaner Ac to be long in the vertical direction as described above, the intake system In can be formed short, and as a result, the rear suspension 4 can be attached to the vehicle body frame F. It becomes possible to increase the degree of freedom in installing equipment.

In the above embodiments, the present invention is applied to a water-cooled two-four cylinder four-cycle internal combustion engine, but it goes without saying that the present invention can also be applied to other types of multi-cylinder internal combustion engines.

C3 Effects of the Invention As described above, according to the present invention, in a motorcycle, the body frame has a main pipe connected to the hend pipe and extending rearward, and a bifurcated shape connected to the rear end of the main pipe to the left and right. and a pair of center frames extending rearward, and the intake system includes a carburetor connected to the intake boat of the multi-cylinder engine and arranged upward toward the rear, and a carburetor arranged above the transmission section of the multi-cylinder engine. and an air cleaner that is connected to the inlet of the carburetor.
Since the upper part of the air cleaner is disposed between the pair of center frames, the air cleaner can be formed vertically long, and its purification capacity can be increased without depending on its longitudinal length, which improves engine performance. It can contribute to the improvement of

Furthermore, the total length of the intake system can be shortened, and the degree of freedom in the layout and mounting position of devices such as a reaction system disposed behind it can be increased.

[Brief explanation of the drawing]

The drawing shows one embodiment of the motorcycle of the present invention.
The figure is a side view thereof, and FIG. 2 is a partial plan view taken along the line ■■ in FIG. 1. Ac...air cleaner, Ca...carburizer, E...
Engine, F...body frame, In...intake system,
Wf...Front wheel, Wr...Rear wheel■...Head pipe, 8...Main pipe, 10.
...Center frame, 18...Mission section, 19.
...Intake pump Figure 2 Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] A body frame (F) on which front and rear wheels (Wf, Wr) are suspended front and rear, a multi-cylinder engine (E) mounted horizontally on this body frame (F), and a multi-cylinder engine (E) located behind the engine (E). In the motorcycle, the body frame (F) includes a main pipe (In) connected to the head pipe (1) and extending rearward. 8) and a pair of center frames (10) that are connected to the rear end of the main pipe (8) and branched left and right into a bifurcated shape and extend rearward, and the intake system (In) Multi-cylinder engine (E
), the carburetor (Ca) is connected to the intake port (19) of the multi-cylinder engine (E) and is arranged rearward and upward; and the carburetor (C
an air cleaner (Ac) communicating with the inlet (20) of a);
A motorcycle characterized in that the upper part of the air cleaner (Ac) is disposed between the pair of center frames (10).