JP3520475B2 - Motorcycle intake system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a motorcycle having an intake system with an air cleaner.

[0002]

2. Description of the Related Art In some motorcycles, for example, an intake system is provided with an air cleaner, and an element is arranged in the air cleaner. This element allows air to pass through to remove dust and send it to the engine side, but since the element becomes dirty, it must be removed and washed or replaced with a new element.

[0003]

As described above, the element is arranged in the air cleaner, but the structure of the air cleaner and the arrangement of the element are such that the element can be easily removed from the air cleaner for cleaning or replacement of the element. Required to do so.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an intake device for a motorcycle which has a simple air cleaner structure, can be manufactured at a low cost, and can be easily attached and detached with an element. .

[0005]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 provides an intake system with an air cleaner and an intake air from this air cleaner.
In an intake device for a motorcycle, which has an intake pipe leading to the engine side, and in which an element is arranged in the air cleaner, the air cleaner is composed of a lower case and an upper case, and a split surface between the lower case and the upper case. The plate-like element is arranged vertically with respect to and is integrated with the upper case.
The downstream opening of the intake duct is located below the upper case.
To direct the intake air to the plate-shaped element
Open toward the plate-like elements, the plate-like Ereme
The inlet is located at the downstream opening of the intake duct and the intake pipe.
Located between the upstream opening of the
It is divided into two parts in the front-back direction, and the plate-shaped element is
The mounting ribs that are formed in the upper case and the lower case
It is characterized in that it is held by being engaged with an engaging recess formed in the side wall .

According to a second aspect of the present invention, there is provided an intake device for a motorcycle, wherein the upper case is provided with an insertion opening into which the plate-shaped element can be inserted.

According to a third aspect of the present invention, there is provided an intake system for a motorcycle, wherein the upper case is provided with an insertion opening into which the plate element can be inserted and a duct mounting opening into which the intake duct is inserted. The intake duct and the cap integrally formed with the intake duct are provided in the duct attachment opening and the insertion opening.

[0008]

According to the first aspect of the present invention, the plate-like element is attached to the lower case and the upper case by arranging the plate-like element in a direction perpendicular to the split surfaces of the lower case and the upper case which form the air cleaner. The parts are formed at the same time when the lower case and the upper case are molded by mold splitting.

According to the second aspect of the invention, the plate-shaped element can be inserted from the insertion opening of the upper case, and the plate-shaped element can be easily attached and detached from the outside.

According to the third aspect of the present invention, the upper case is provided with the insertion opening and the duct attachment opening, and the cap integrally formed with the intake duct can be easily attached together.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An intake device for a motorcycle according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of a motorcycle, FIG. 2 is a side view of an upper portion of an engine of the motorcycle, FIG. 3 is a plan view of an upper portion of an engine of the motorcycle, and FIG. 4 is a cross section showing an intake device of the motorcycle. 5, FIG. 5 is a plan view showing the intake device of the motorcycle, FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, and FIG. 7 is V of FIG.
FIG. 7 is a sectional view taken along line II-VII.

A vehicle body frame 1 of a motorcycle has a truss main frame 2 assembled with a number of frames 2a, and a head pipe 3 is provided on the front side of the truss main frame 2. A front fork 4 is provided on the head pipe 3, a front wheel 5 is supported on a lower portion of the front fork 4, and a handle 6 is attached on an upper portion thereof.

The rear portion of the truss main frame 2 is
It is composed of a seat rail 8 and a back stay 9 that supports the seat rail 8 from below. Also, at the lower center of the truss main frame 2, the rear arm bracket 7
Are connected. A fuel tank 10 is arranged on the front side of the truss main frame 2, and a tandem seat 11 is arranged behind the fuel tank 10 as a seat. The tandem seat 11 is composed of a tandem front seat 11a and a tandem rear seat 11b. .

The rear cowl 12 covers the lower part of the tandem seat 11 from the both sides of the tandem seat 11. A front cowl 13 covers the periphery of the head pipe 3 from the front side of the truss main frame 2.

A rear arm bracket 7 provided below the truss main frame 2 supports a rear arm 15 so as to be vertically swingable via a pivot shaft 14, and a rear wheel 16 is provided on the rear arm 15. .

An engine 17 is supported on the truss main frame 2 and the rear arm bracket 7, and the engine 17 has two parallel cylinders. The cylinder 18 of the engine 17 is arranged so as to be tilted to the front side, and the cylinder 18 is attached to and supported by the truss main frame 2, and the crankcase 19 of the engine 17 is attached via the mounting brackets 20 and 21 to the truss main frame 2 and the rear arm bracket. It is supported by 7.

At the rear side of each cylinder 18, the intake pipe 2
2 is connected to the intake pipe 22 and a carburetor 23 is connected to the intake pipe 22.
It is located between The carburetor 23 has an air cleaner 24.
The air cleaner 24 is arranged at a lower front position of the fuel tank 10 so as to be covered by a recess 10a provided on the bottom surface of the front part of the fuel tank 10. Cylinder 1
Exhaust pipes 25 are connected to the front sides of the exhaust pipes 8. The exhaust pipes 25 extend rearward through the lower part of the engine 17, and a muffler 26 is connected to the rear end of the muffler 26. It is located on both the left and right sides of.

A radiator 30 is disposed above the front side of the cylinder 18 of the engine 17, and the radiator 30 is attached to the truss main frame 2. Cylinder 18
A water pipe 31 extending upward is connected to the cylinder head 18a of the above, a thermostat 33 is connected to the water pipe 31 via a water hose 32, and the thermostat 33 is attached to the truss main frame 2 via a bracket 34. There is. A water hose 35 is connected to the thermostat 33, and a water hose 37 is connected to the water hose 35 via a connecting pipe 36. The water hose 37 is connected to the radiator 30.
Connected to the upper left side of. A water hose 38 is connected to the lower left portion of the radiator 30, and the water hose 38 is connected to a water pump (not shown) of the engine 17.

A small-diameter bypass hose 39 is connected between the water pipe 31 and the carburetor 23 on the right side, and the carburetors 23 on the left and right sides are connected.
Similarly, they are connected by a small-diameter bypass pipe 40, a small-diameter bypass hose 41 is connected between the left vaporizer 23 and the connection pipe 36, and a bypass path A that bypasses the thermostat 33 is formed.

When the temperature of the water is low and the thermostat 33 is closed when the engine 17 is started, the water flows from the water pipe 31 to the bypass hose 3 by the operation of a water pump (not shown).
9 is led to the carburetor 23 on the right side, and further, by the bypass pipe 40, flows from the bypass hose 41 to the connection pipe 36 via the carburetor 23 on the left side, bypasses the thermostat 33 and is sent from the water hose 37 to the radiator 30. To be In this way, when the engine 17 is started, by bypassing the thermostat 33 and sending the hot water after engine cooling to the left and right carburetors 23, the carburetor 23 can be prevented from freezing.

Further, since the temperature of water is high, the thermostat 3
When 3 is open, water flows from the water pipe 31 to the thermostat 3 via the water hose 32 by the operation of a water pump (not shown).
3 through, water hose 35, connecting pipe 36 and water hose 37
Sent to the radiator 30. Water from the radiator 30 is returned to a water pump (not shown) of the engine 17 via a water hose 38 to cool the engine 17. When the thermostat 33 is open, the bypass hose 39,
Carburetor 23 on the right side, bypass pipe 40, carburetor 2 on the left side
By the bypass path A composed of 3, the bypass hose 41, and the connecting pipe 36, the amount of water flowing around the thermostat 33 is small, and the carburetor 23 is prevented from being excessively warmed.

The air cleaner 24 is a lower case 5 which is divided into upper and lower parts.
0 and the upper case 51, and the lower case 50 and the upper case 51 are molded by resin molding in the opening direction. A pair of left and right openings 5 is provided on the rear side of the bottom of the lower case 50.
0a is formed, and the left and right carburetors 2 are provided in the pair of openings 50a.
The intake pipe 52 connected to No. 3 is inserted. Intake pipe 5
The second upstream opening 52a opens toward the front upper side. On the front side of the bottom of the lower case 50, an escape recess 50b is formed which straddles the frame 2a of the truss main frame 2 arranged in the vehicle width direction. A mounting boss 50c is formed on a front outer side portion of the lower case 50, and the mounting boss 50c is inserted into and attached to a grommet 54 of a bracket 53 fixed to the truss main frame 2. A breather portion 50d is formed on the inner rear side of the lower case 50, and is connected to the cylinder 18 of the engine 17 via a breather hose 55. Further, at the bottom of the lower case 50, a drain discharge part 50e for discharging the drain accumulated in the case is formed.

An engaging rib 50f is formed on the joint surface of the lower case 50.
Is formed on the joint surface of the upper case 51.
Is formed, the engaging ribs 50f on the joining surface of the lower case 50 are engaged with the engaging recesses 51a on the joining surface of the upper case 51 to be sealed, and are fixed by screws 56.

A plate-shaped element 60 is arranged in a direction perpendicular to the split surface L of the lower case 50 and the upper case 51, and the plate-shaped element 60 is located between the relief recess 50b and the upstream opening 52a of the intake pipe 52. However, the inside of the air cleaner 24 is divided into two in the front-rear direction.

An insertion opening 51b into which the plate element 60 can be inserted is formed in the center of the upper case 51.
On the front side, the duct mounting opening 5 for inserting the intake duct 61
1c is formed. The plate element 60 is inserted through the insertion opening 51b, and the mounting ribs 60a formed around the front side of the plate element 60 are engaged with the engaging recesses 51d and 50g formed on the inner walls of the upper case 51 and the lower case 50. They are held together. The plate-shaped element 60 can be inserted from the insertion opening 51b of the upper case 51, and the plate-shaped element 60 can be easily attached and detached from the outside.

The intake duct 61 and the cap 62 are integrally formed, the intake duct 61 is inserted through the duct mounting opening 51c, and the cap 62 is mounted so as to cover the insertion opening 51b. Attachment part 61 of intake duct 61
A concave portion 61b is formed in a, and the concave portion 61b is engaged with a mounting rib 51e formed around the opening of the duct mounting opening through an O ring (not shown) to be sealed.
It is fixed by tightening at 3. The intake duct 61 is the upper case 5
1 extends rearward along the recessed portion 51f, and the upstream side opening 61
c is opened rearward above the cap 62, the downstream side opening 61d is located above the escape recess 50b in the front side and opened toward the plate element 60, and the intake duct 61 has a predetermined length. In addition, it is integrated with the upper case 51, and the intake air is smoothly guided to the plate-shaped element 60.

Further, in the center of the upper portion of the upper case 51, a recess 51k in the front-rear direction and in the front-rear direction is formed at a position facing the upstream side opening 61c of the intake duct 61, and air is supplied from the rear of the air cleaner 24 to the fuel tank. 10 recesses 10a
And the air passage B formed by the recess 51k of the upper case 51.
Flows in the direction of the arrow.

A recess 62b is formed in the mounting portion 62a of the cap 62 formed integrally with the intake duct 61, and the recess 62b is attached to a mounting rib 51g formed around the opening of the insertion opening 51b and an O-ring (not shown) is formed. Are engaged with each other to be sealed and fastened by screws 64. Positioning ribs 62c are formed at three locations inside the cap 62, and a tip portion 62d of the positioning ribs 62c is formed.
Are formed on the slope, and the mounting ribs 60 of the plate-like element 60 are
The mounting rib 60a is engaged with the engaging recesses 51d,
It is designed to be held in pressure contact with the side surface of 0 g. Since the cap 62 integrally formed with the intake duct 61 is integrally formed, the cap 62 can be easily attached together and the number of parts can be reduced.

As described above, since the plate-like element 60 is arranged in the direction perpendicular to the split surface of the lower case 50 and the upper case 51 which constitute the air cleaner 24, the lower case 50 and the upper case to which the plate-like element 60 is attached are arranged. The engaging recesses 51d and 50g forming the mounting portion of the case 51 can be formed at the same time when the lower case 50 and the upper case 51 are molded by mold splitting.

[0031]

As described above, the invention according to claim 1 is
Since the plate-like elements are arranged in the direction perpendicular to the split surfaces of the lower case and the upper case that compose the air cleaner, the lower case and the upper case are attached by attaching the plate-like elements to the lower and upper case mounting parts. The air cleaner can be formed at the same time as molding, and the air cleaner can be manufactured at a low cost with a simple structure.

According to the second aspect of the invention, since the upper case is provided with the insertion opening into which the plate-shaped element can be inserted, the plate-shaped element can be inserted from the insertion opening and the plate-shaped element can be easily inserted from the outside. Can be attached and detached.

According to the third aspect of the present invention, since the intake duct and the cap integrally formed with the intake duct can be attached to the duct mounting opening and the insertion opening, it is formed integrally with the intake duct. The caps can be easily attached together and the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a side view of an upper portion of an engine of a motorcycle.

FIG. 3 is a plan view of an upper portion of an engine of a motorcycle.

FIG. 4 is a cross-sectional view showing an intake device of a motorcycle.

FIG. 5 is a plan view showing an intake device of a motorcycle.

6 is a cross-sectional view taken along the line VI-VI of FIG.

7 is a sectional view taken along the line VII-VII of FIG.

[Explanation of symbols]

24 air cleaner 50 lower case 51 upper case 60 elements

─────────────────────────────────────────────────── ─── Continued Front Page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62J 39/00 B62M 7/02 F02M 35/024 511 F02M 35/16

Claims (3)

(57) [Claims] 1. An air cleaner and an air cleaner for the intake system.
In an intake device for a motorcycle, which includes an intake pipe for guiding intake air from an engineer to an engine side, and in which an element is arranged in the air cleaner, the air cleaner is composed of a lower case and an upper case, and a lower case And a plate-shaped element arranged in a direction perpendicular to the split surface of the upper case, and the downstream side opening of the intake duct integrated with the upper case
Hangs downward from the upper case to draw the intake air into the plate.
Toward the plate-shaped element so as to guide the plate-shaped element
And the plate-shaped element is a downstream opening of the intake duct.
And an upstream opening of the intake pipe,
The inside of the cleaner is divided into two parts in the front-back direction, and the plate-shaped element has mounting ribs formed on the periphery thereof,
Engagement formed on the inner wall of the upper case and the lower case
An intake device for a motorcycle, characterized in that the intake device is held in engagement with a recess . 2. The intake system for a motorcycle according to claim 1, wherein the upper case is provided with an insertion opening into which the plate element can be inserted. 3. The upper case is provided with an insertion opening into which the plate-shaped element can be inserted and a duct mounting opening into which an intake duct is inserted, and the duct mounting opening and the insertion opening. The intake device for a motorcycle according to claim 1, wherein the intake duct and a cap formed integrally with the intake duct are attachable to the intake duct.