JPS6138346B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection structure between an air cleaner and a joint that guides air passed through the air cleaner to a carburetor.

In conventional air cleaners used in motorcycles and the like, a tightening band is used to connect the air that has passed through the air cleaner to a joint that guides the air to a carburetor. In other words, the case of the air cleaner is formed with a cylindrical outlet that protrudes to the outside, while an opening at one end of a joint made of an elastic material such as rubber is attached to the outer periphery of the outlet, and a metal They were connected by tightening with a tightening band. This not only requires a tightening band, but also requires time and effort to tighten the tightening band. There were also cases where the tightening band became loose and the airtightness was compromised.

The present invention has been made in view of these inconveniences, and an object of the present invention is to provide a joint connection structure for an air cleaner that is simple in structure, easy to assemble, and has excellent airtightness. In an air cleaner in which a cylindrical air cleaner element is held in a case by a bottom portion having a discharge port and a lid, a flange portion is integrally provided at one end of a joint inserted into the discharge port. The above object is achieved by sandwiching the flange between the bottom and the end face of the air cleaner element, and by engaging the small cylindrical part protruding from the end of the air cleaner element into the open end of the joint on the flange side. It is something to do. The present invention will be explained in detail below based on the drawings.

Fig. 1 is a plan view of a motorcycle to which an embodiment of the present invention is applied, Fig. 2 is a side view of the same, Fig. 3 is a side view of the same with a part of the air cleaner cut away, and Fig. 4 is the - line. A sectional view and FIG. 5 are exploded perspective views of the air cleaner element.
In FIGS. 1 and 2, reference numeral 1 indicates a cradle-type frame, and reference numeral 2 indicates a front fork rotatably held on a head pipe. 4 is the rear arm,
5 is a spring with a damper, and 6 and 7 are front and rear wheels, respectively. Further, 8 is a fuel tank, and 9 is a seat. Reference numeral 10 denotes an engine, which is mounted on the frame 1 in a forward leaning position. 11 is this engine 1
Exhaust pipe that guides exhaust gas from the front of the vehicle to the rear of the vehicle body, 1
2 is a vaporizer. This carburetor 12 is the engine 1
An air cleaner 13 is located behind the carburetor and below the seat 9.
is installed. The intake air passes through this air cleaner 13, passes through the carburetor 12, and is then sent to the engine 10.
is inhaled.

Next, this air cleaner 13 will be explained based on FIGS. 3, 4, and 5. A case 14 of this air cleaner 13 is provided with a partition wall 15 that forms a substantially spiral air passage therein, and is formed so as to be split into two from a bottom portion 14a and a lid portion 14b. A suction cylinder 16 is attached to the outer peripheral wall of the case 14. This suction cylinder 16 guides outside air sucked in from the suction port 16a into the case 14. A discharge port 17 consisting of an elongated oval opening is formed at the bottom of the bottom portion 14a of the case 14.

18 is an air cleaner element;
As is clear from the figure, it consists of a guide 19 and a overlay 20. The overfill material 20 is formed by covering the outer circumferential surface of a cylindrical foamed resin 20a such as Moltoprene with a flocked portion 20b, and a small amount of oil is impregnated into the entirety. The guide 19 is inserted into the overfill 20 and is formed into a substantially cage shape so as to prevent the overfill 20 from being deformed. That is, the discharge port 17 formed in the bottom 14a of the case 14
The guide 19, which is formed into a cylindrical shape with a slightly larger diameter, has windows formed in the cylindrical portion so as to leave four legs 19a. A small cylindrical portion 19c having a smaller diameter than the discharge port 17 and extending outward in the axial direction of the guide 19 is integrally formed on one open end surface 19b of the guide 19. The length of this small cylinder portion 19c is determined by the length of the element 18 as described later.
The tip of the small cylindrical portion 19c is set to fit into the open end of the joint 21 inserted into the discharge port 17 when the small cylinder portion 19c is installed in the case 14.

21 is a joint, which connects the discharge port 17 of the air cleaner 14 and the carburetor 12;
It is made of flexible material such as rubber. The outer circumferential shape of the open end of the main body 21a of the joint 21 on the air cleaner 14 side is the same as that of the discharge port 1.
The joint 21 has an elongated oval shape that is slightly smaller than the shape of the joint 21, and a flange 21b is integrally formed around the entire circumference of the opening edge of the joint 21. In addition,
In this embodiment, a locking flange 21c is attached to the outer periphery of the joint 21 so as to have a distance from the flange 21b corresponding to the thickness of the bottom 14a of the case 14.
is provided.

The joint 21 is deformed so as to crush the flange 21b and inserted into the discharge port 17, and the discharge port 17 is inserted between the flange 21b and the locking flange 21c.
The periphery of the is engaged. In this state joint 21
is temporarily locked to the bottom 14a of the case 14. Next, the element 18 consisting of the guide 19 and the overlay 20 is attached via an elongated oval seal 22 made of sponge or the like. At this time, the small cylindrical portion 19c of the guide 19 presses the joint body 21a outward. That is, the joint main body 21a has a discharge port side surface 17a between the flange 21b and the locking flange 21c.
and the small cylinder portion 19c. Next, an elongated oval seal 23 made of sponge or the like is placed on the other end surface of the element 18, and the lid 14b of the case 14 is placed over the seal 23 and fixed with screws 24. As a result, the element 13 is located at the bottom 14a of the case 14.
and the lid portion 14b. At this time, the open end surface 19b of the guide 19 of the element 18 presses the flange 21b of the joint 21 toward the bottom 14a via the seal 22. Therefore, the flange portion 21b is held between the opening end surface 19b of the element 18 and the inner surface 17b of the discharge port periphery of the case 14.
As is clear from FIG. 3, the partition wall 15 formed inside the case 14 is formed to guide the outside air sucked in from the suction tube 16 in a spiral shape along the outer periphery of the element 18. 18
It is sucked almost uniformly from the outer periphery.

In the air cleaner 13 configured as described above, when the engine 10 is started, outside air passes through the air cleaner 13 in the following manner. That is, due to the intake negative pressure of the engine 10,
Outside air enters the case 14 from the intake port 16a through the suction cylinder 16, is guided by the partition wall 15, travels inside the case 14, and reaches the outer peripheral surface of the element 18. First, relatively coarse particles are captured in the flocked portion 20b, and fine particles are further captured by the overfill material 20a and enter the inside of the element 18 through the window of the guide 19. The exhausted intake air passes through the small cylinder part 19c of the guide 19, enters the joint 21, and enters the carburetor 12.
to go into.

In the above embodiment, the element 18 is formed of the guide 19 and the overfill material 20, but the present invention is not limited to this, and a small cylindrical portion is formed that can be attached and removed when the overfill material is attached and removed. For example, a dry cylindrical element using radially folded paper and having a small cylindrical portion formed on the open end surface of one end may be used. In addition, in this embodiment, since the locking flange 21c is provided near the flange 21b, the joint 21 is secured even when replacing the element.
Since it is locked to the case 14 at a certain position, work efficiency is improved.

As explained above, according to the present invention, a flange is integrally provided at one end of the joint inserted into the discharge port of the case, and the flange is held between the bottom of the case and the end face of the air cleaner element. Since the small cylindrical part protruding from the end face of the joint is inserted into the open end face of the flange side of the joint, the structure is simple and the tightening band required for conventional products is not required, reducing the number of parts. At the same time, the number of assembly steps is reduced and assembly efficiency is improved. Furthermore, since the flange of the joint and the main body are held between the end face of the element and the peripheral inner surface of the discharge port, and between the small diameter portion and the side surface of the discharge port, airtightness is excellent.

Note that since the air cleaner element is formed with a small cylindrical portion, it is extremely convenient for positioning the element.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view of a motorcycle to which an embodiment of the present invention is applied, FIG. 3 is a partially cutaway side view of an air cleaner element, and FIG. 4 is a cross-sectional view taken along the line - FIG. 5 is also an exploded perspective view of the element. 12... Carburetor, 13... Air cleaner, 14
. . . Case, 17 . ...Joint body, 21a...flange.

Claims (1)

[Claims] 1 Air cleaner element 1 formed into a cylindrical shape
8, a bottom portion 14a having a discharge port 17, and a lid body 14b.
In the air cleaner sandwiched within the case 14, a flange 21b is integrally provided at one end of the joint 21 inserted into the discharge port 17, and the flange 21b is connected to the bottom 14a and the end surface 19b of the air cleaner element 18. A joint connection structure for an air cleaner characterized in that a small cylindrical portion 19c protruding from an end surface 19b of the air cleaner element is inserted into an open end on the flange side of the joint 21.