JP2513803Y2 - Air cleaner for motorcycle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the structure of an air cleaner for a motorcycle engine.

[Conventional technology]

In a motorcycle, an air cleaner for cleaning the air supplied to the engine is used. The air cleaner generally divides the inside of the case into a dirty side and a clean side by a cleaner element,
Using the negative pressure of the engine, the air introduced from the suction port of the dirty side is cleaned by the element and then fed to the engine from the outlet of the clean side.

In this case, if water or dust enters from the intake port of the air cleaner, the cleaning performance of the cleaner emulation may deteriorate, or it may enter the inside of the engine and cause engine malfunction. Must be opened at a position inside the vehicle body where water and dust are relatively small, for example, under the fuel tank or under the seat.

By the way, in a motorcycle of a type in which a space is provided between a steering wheel and a seat, such as a moped type in which a passenger is seated, a fuel tank is usually fixed at a central portion of a vehicle body, and a seat is mounted on the fuel tank. A structure is adopted in which the frame between the handle portion and the fuel tank is lowered and the cover is mounted thereon while being attached.

 As a prior art, there is Sankaihei 1-127962.

[Technical issues to be solved by the invention]

Therefore, in the above-described moped type motorcycle, the air cleaner cannot be disposed under the fuel tank or the seat, and may be attached to the lower side (back side) of the cover between the handle and the seat. Has been done.

However, if the conventional air cleaner is installed in such a position that is susceptible to running wind, it becomes difficult to completely prevent intrusion of rainwater and dust, and it is easy to cause early deterioration of the cleaner element and engine malfunction. There were challenges.

The present invention has been made in view of such technical problems, and an object of the present invention is to efficiently separate water and dust from the air before the cleaner element even when the air contains water and dust. Therefore, the cleaning ability of the cleaner element can be maintained for a long period of time, engine malfunction due to water and dust can be prevented, and engine durability can be improved. It is to provide an air cleaner for the engine.

[Means for solving problems]

According to the present invention, the inside of a case having an inlet and an air outlet is divided into a dirty side and a clean side by a cleaner element, and the dirty side is divided into a first chamber on the inlet side and a second chamber on the cleaner element side. In an air cleaner for a motorcycle engine, which is divided into a chamber and which cleans air introduced from the suction port by the cleaner element and then feeds the air from the air outlet to the engine,
A direction in which the first chamber and the second chamber are communicated with each other by a duct projecting into at least the first chamber, and the shape of the tip of the duct projecting into the first chamber is lower on the side opposite to the suction port. And the air from the suction port is introduced toward the root of the duct protruding into the first chamber to enable gas-liquid separation of the suction air in the first chamber. The above object is achieved by forming a small hole for drainage in the bottom of the first chamber.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows an automatic 2 equipped with an air cleaner according to the present invention.
It is a side view which shows the principal part structure of a wheeled vehicle.

In FIG. 3, a steering head 2 having a bearing structure is fixed to a front end of a main frame 1, and a front fork 3 is rotatably supported by the steering head 2, and a lower end of the front fork 3 is supported. Front wheels (steering wheels) 4 are attached to the section, and a handle 5 is fixed to the upper end of the front fork 3.

A fuel tank 6 is fixed above the intermediate portion of the main frame 1 in the front-rear direction, and a seat 7 is attached on the fuel tank 6.

An engine 8 is mounted below the middle portion of the main frame 1 in the front-rear direction, and an intake system including an air cleaner 9 and a carburetor 10 is connected to the engine 8.

Further, the main frame 1 is provided with a front cover 11 for covering each component between the steering head 2 and the fuel tank 6.

That is, the main frame 1, the air cleaner 9, the engine 8 and the like are arranged inside (lower side) of the front cover 11.

Reference numeral 12 in FIG. 3 indicates the front fork 3
Shows the front fender (front wheel mudguard) attached to the.

FIG. 1 is a vertical sectional view showing a detailed structure of the air cleaner 9, and FIG. 2 is a partially cutaway lateral sectional view of the air cleaner 9 of FIG.

1 to 3, the case 21 of the air cleaner 9 is shown.
The inside of the is partitioned into a dirty side 23 and a clean side 24 by a cleaner element 22 made of an air filtering material such as paper or a porous material.

The dirty side 23 is further divided by a partition wall 25 into a first chamber 26 and a second chamber 27.

The case 21 is attached to the bracket 14 of the main frame 1 by fastening means 13 such as bolts and nuts.

A duct portion 28 is formed in the first chamber 26, and the duct portion 28
An air suction port 29 is formed by the tip opening portion of the.

The air intake port 29 opens in the space inside the reinforcing gusset 15 at the joint between the main frame 1 and the steering head 2, and passes through the inside of the main frame 1 formed of a pipe, through a hole (not shown) to the inside of the reinforcing gusset 15. Is arranged so as to inhale the air introduced into the space.

The partition wall 25 is provided with a duct 30 for communicating the first chamber 26 and the second chamber 27.

In this embodiment, the ducts 30 are provided at two places on the left and right.

The clean side 24 is provided with a duct-shaped air outlet 31, and the air outlet 31 is connected to the engine 8 via the carburetor 10 (FIG. 3).

In this way, the inside of the case 21 is dirty sided by the cleaner element (hereinafter, simply referred to as an element) 22.
23 (26, 27) and the clean side 24 are divided, and the air introduced from the suction port 29 of the dirty side 23 is cleaned by the element 22 and then fed from the outlet 31 of the clean side 24 to the engine. An air cleaner 9 for a motorcycle engine is configured.

The flow of intake air shown by the arrows in FIGS. 1 and 2 is generated by the intake negative pressure when the engine 8 rotates.

The element 22 has a second chamber 27 of the dirty side 23.
Between the clean side 24 and the clean side 24, so that on the dirty side 23 all the air passes through the first chamber 26 and then flows through the duct 30 into the second chamber 27. Has been done.

The case 21 is divided by the mating surface 41 into the first half 42 and the second half.
43 is assembled by fastening with a bolt or the like not shown, and the element 22 is positioned and held by the mating surface 41.

Further, in each of the ducts 30, the outer peripheral groove 44 is fitted into the notch 45 formed in the partition wall portion 25A on the case front half portion 42 side, and the partition wall portion 25B of the assembled case rear half portion 43 is connected to the partition wall portion 25A. It is positioned and held by abutting against.

Therefore, the duct 30 projects to the inside of the first chamber 26 on the upstream side by a predetermined height, and the tip end thereof is inclined in a direction in which the opposite side of the suction duct portion 28 is lowered.

That is, when the inhaled air contains water and dust, the water and dust are easily separated from the air in the first chamber 26.

In the illustrated example, the duct 30 includes the second chamber 27 on the downstream side.
Of the element 22.
The other side is inclined so that it becomes lower.

The duct 30 can be formed of plastic or the like, but in order to ensure hermeticity, it is preferably formed of, for example, a rubber-like elastic material.

Further, it is preferable that the duct 30 has a vertically symmetrical shape as shown in the drawing to improve workability in assembling.

A small discharge hole 32 for discharging the separated water and dust to the outside is formed at the bottom of the first chamber 26.

The discharge hole 32 is formed, for example, in a slit shape, and when the motorcycle is tilted to the left when the vehicle is parked with the side stand upright, the drain hole 32 is formed as close to the left side as possible to improve drainage performance. Is being pursued.

Due to the above, the dirty side 23 is placed in the first chamber on the suction port side.
26 and the second chamber 27 on the element side, and the first chamber 26
And a duct projecting the second chamber 27 into at least the first chamber
An air cleaner for a motorcycle engine configured to communicate with each other 30 and to form a small hole 32 for drainage in the bottom of the first chamber 26 to perform gas-liquid separation in the first chamber. 9 are offered.

In this embodiment, a discharge port 33 for discharging water and dust is also formed in the bottom of the second chamber 27, and the first chamber 26
It has a structure that can discharge water and dust that have not been separated by.

It is preferable that the discharge port 33 is also formed as close to the left side as possible for the reason described above.

Further, in the example shown in the drawing, fine through holes 34 are formed in the peripheral portion of the duct 30 so that when a large amount of water or dust invades at once at the time of car washing or the like, it is separated in the first chamber 26. The water and dust that cannot be formed can be discharged to the outside from the discharge hole 33 of the second chamber by dropping it into the second chamber 27.

According to the embodiment described above, the following effects were obtained.

i) The dirty side 23 is divided into a first chamber 26 on the upstream side and a second chamber 27 on the downstream side, and a duct 30 projecting into the first chamber 26 communicates between the two so that it is inhaled. Water and dust in the air can be separated in the second chamber 27, so that it is possible to prevent water and dust from invading the element 22 and the engine 8, and keep the elements and the engine in good condition for a long time. An air cleaner that can be maintained in good condition for the entire time is obtained.

ii) Since the discharge port 32 is provided at the bottom of the first chamber 26, the separated water and dust can be discharged successively, and thus an air cleaner capable of further realizing the above-mentioned effect can be obtained.

iii) Further, since the discharge hole 33 is provided at the bottom of the second chamber 27, water and dust that have not been discharged from the first chamber (separation chamber) 26 can also be discharged from the discharge hole 33. Therefore, the air cleaner which can further enhance the above-mentioned effect was obtained.

iv) Furthermore, since the shape of the tip of the duct 30 protruding into the first chamber 26 is formed so as to incline in the direction in which the duct portion 28 side having the suction port 29 becomes higher, the air before reaching the cleaner element is An air cleaner capable of separating water and dust more efficiently has been obtained.

[Effect of device]

As is clear from the above description, according to the present invention, the inside of the case having the suction port and the air outlet is divided into the dirty side and the clean side by the cleaner element, and the dirty side is divided into the first side on the suction port side. In an air cleaner for a motorcycle engine, which is divided into a chamber and a second chamber on the cleaner element side, and the air introduced from the suction port is cleaned by the cleaner element and then fed from the air outlet to the engine. , The first chamber and the second chamber are communicated by at least a duct projecting into the first chamber, and the shape of the tip of the duct projecting into the first chamber is lower on the side opposite to the suction port. Is sucked in the first chamber by introducing air from the suction port toward the root of the duct protruding into the first chamber. Since air-liquid separation is possible and a small hole for drainage is formed at the bottom of the first chamber, even if the air contains water or dust, these can be separated before the cleaner element. It can be efficiently separated from the air, which can maintain the cleaning ability of the cleaner element for a long time, prevent engine malfunction caused by water and dust, and improve the durability of the engine. An air cleaner for a motorcycle engine is provided.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of an air cleaner for a motorcycle engine according to the present invention, FIG. 2 is a partially cutaway plan view of the air cleaner of FIG. 1, and FIG. 3 is an air cleaner of FIG. FIG. 3 is a side view showing a configuration example of a main part of a motorcycle provided with. In the following, reference numerals indicating major components in the drawings are listed. 1 ... Main frame, 2 ... Steering head, 4
...... Front wheels, 5 ... Handle, 6 ... Fuel tank, 7 ...
... Seat, 8 ... Engine, 9 ... Air cleaner, 10 ...
… Carburettor, 11 …… Front cover, 15 …… Reinforcement gusset, 21 …… Case, 22 …… Cleaner element, 23 ……
Dirty side, 24 …… Clean side, 25 …… Bulkhead,
26 ... first chamber, 27 ... second chamber, 29 ... suction port, 30 ...
… Duct, 32 …… Discharge hole, 33 …… Discharge hole.

Claims (1)

(57) [Scope of utility model registration request] 1. A case having a suction port and an air outlet is divided into a dirty side and a clean side by a cleaner element, and the dirty side is divided into a first chamber on the suction port side and a second side on the cleaner element side. In the air cleaner of the motorcycle engine, the air is introduced into the engine through the suction port and is then cleaned by the cleaner element before being fed from the air outlet to the engine. The second chamber communicates with at least a duct projecting into the first chamber, and the shape of the tip of the duct projecting into the first chamber is inclined in a direction in which the side opposite to the suction port is lower than the suction port. By introducing the air from the mouth toward the root of the duct projecting into the first chamber, it is possible to separate the intake air from the liquid in the first chamber. An air cleaner for a motorcycle engine, characterized in that a small hole for drainage is formed in the bottom of the chamber.