JPS636447Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drainage device for an air cleaner installed in an internal engine.

A case of an air cleaner installed in an internal engine is provided with a drainage device for draining water accumulated inside the case to the outside. Conventionally, such drainage devices have generally had a drain groove formed on the inner surface of the case, or have a drain pipe built inside the case, with one end of the drain pipe extending outside the case. . However, the former drainage device has a problem in that the water flowing along the drain is exposed to the intake airflow, and water mist is mixed into the intake airflow. Furthermore, in the case of the latter drainage device, a drain pipe must be provided separately, which increases the cost accordingly.

The present invention was devised to effectively solve these problems, and its purpose is to provide a drainage device for an air cleaner that has a simple structure and is free from the risk of water mist being mixed into the intake air flow. It's about doing.

The gist of the present invention is to provide a case for an air cleaner in which a pair of integrally molded members are fitted into each other and an intake pipe and a blow-by gas introduction pipe are connected to each other. By fitting the integrally molded members 3, 4 together, the grooves allow the integrally molded members 3, 4 to fit together.
(b) One end of the drainage passage 8 is connected to the interior of the case 2 consisting of the pair of integrally molded members 3 and 4 for air intake. (c) One end of the water separation passage 25 is opened to the part where water that has entered from the pipe 15 collects, and the other end is released to the outside of the case 2.
(d) A blow-by gas introduction pipe 32 is connected in the middle of the water separation passage 25.

The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a front view of an air cleaner 1 for a motorcycle. The case 2 of the air cleaner 1 is composed of a left half 3 and a right half 4, which are integrally molded from synthetic resin, and the case 2 is constructed by fitting the halves 3 and 4 together. As shown in FIGS. 2 to 4, a wire 5 is disposed on the mating surfaces of both the halves 3 and 4, and after the halves 3 and 4 are mated, the wire 5 is heated by high-frequency heating. By doing so, the fitting surfaces are welded together. In FIGS. 1 and 2, 15 is an intake pipe, 16 is a connecting pipe for supplying air to a carburetor (not shown), and 17 is a trap.

As shown in FIGS. 2 and 3, a pair of grooves 6 and 7 each having a U-shaped cross section are formed on the lower fitting surfaces of the left and right halves 3 and 4, respectively. When both halves 3 and 4 are fitted together, one drainage passage 8 is formed by the pair of grooves 6 and 7.
is beginning to form. Note that the groove portion 6,
7 does not necessarily need to be formed on both the left and right halves 3 and 4, and may be formed on either one of the halves.

The upper end 9 of the drainage passage 8 thus formed is connected to the bottom wall 1 in the case 2 through the communication hole 10.
It is open to 1. In addition, the lower end 1 of the drainage passage 8
2 is open to the outside of the case 2 via the communication hole 13. Note that a mouthpiece 14 for connecting a drainage tube 35 is integrally formed on the outside of the communication hole 13.

As shown in FIG. 2, a cylindrical air filter 18 is housed inside the case 2, and the air filter 18 is supported by a holder 19 inserted inside the case 2. The bottom surface 20 of this holder 19 is shaped like a funnel, and a drainage hole 21 is provided in the center of the bottom surface 20.
is provided. A drain pipe 22 attached to the drain hole 21 is inserted into the communication hole 10 of the drain passage 8. Therefore, water sucked into the case 2 from the intake pipe 15 flows into the drain passage 8 from the drain hole 21.

On the other hand, a pair of grooves 23 and 24 each having a U-shaped cross section are formed on the front fitting surfaces of both the left and right halves 3 and 4, as shown in FIGS. 2 and 4. When both halves 3 and 4 are fitted together, one water separation passage 25 is formed by the pair of grooves 23 and 24. Note that the grooves 23 and 24 do not necessarily need to be formed in both the left and right halves, and may be formed in either one of the halves.

The upper end 26 of the water separation passage 25 thus formed is open facing the upper wall 27 inside the case 2 in a slightly narrowed state. On the other hand, the lower end 28 of the water separation passage 25 is communicated with the lower end 12 of the drainage passage 8 via a communication hole 29. In addition, a case 2 is provided near the upper end 26 of the water separation passage 25.
A base portion 31 projecting outward is attached. One end of a blow-by gas introduction pipe 32 is connected to this mouthpiece 31 so that blow-by gas leaking into a crank chamber (not shown) is introduced into the vicinity of the upper end 26 of the water separation passage 25 through the introduction pipe 32. It's summery. In FIG. 2, 30 is a sponge drain filter, and 33 is a water drain hole.

The air cleaner 1 is configured as described above, and when water is sucked into the case 2 from the intake pipe 15, this water flows into the drain passage 8 through the drain hole 21, and is drained to the outside through the drain tube 35. be done. Therefore, water is not exposed to the intake air flow during this drainage process, and there is no possibility that water mist will be mixed into the intake air flow.

On the other hand, when the blow-by gas flows into the water separation passage 25 through the introduction pipe 32, a mist of water contained in the gas adheres to the inner wall of the water separation passage 25. Therefore, the gas component and the mist component of the blow-by gas are separated, and the gas component is returned into the case 2 from the upper end portion 26 of the water separation passage 25. Further, the mist becomes a liquid, flows down inside the water separation passage 25, and is discharged to the outside through the drainage tube 35.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways.

As described above, in the case of an air cleaner made up of a pair of integrally molded members that are fitted together, the present invention forms a drainage passage 8 along the fitting surface of the integrally molded members 3 and 4, and prevents water from entering the case 2. Since most of the water is drained to the outside through the drain passage 8, the water is not exposed to the intake flow during the drainage process, and water mist is prevented from being mixed into the intake flow as much as possible. It can be prevented. Furthermore, since the drainage passage 8 is formed on the fitting surface of the integrally molded members 3 and 4, there is no need for any drain pipes, etc. used in conventional drainage devices, resulting in a structurally simple and low-cost drainage system. A device is obtained.

Furthermore, since the drainage passage 8 and the water separation passage 25 are formed simply by fitting the pair of integrally molded members 3 and 4 together, the air cleaner can be assembled efficiently and new parts can be added. Therefore, the cost of the air cleaner can be reduced.

Further, a water separation passage 25 is formed along the fitting surface of the case 2 of the air cleaner, and this water separation passage 25
Since most of the moisture in the blow-by gas is separated within the engine and discharged to the outside, it is possible to prevent the moisture from being sucked into the engine as much as possible.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of an air cleaner, Fig. 2 is a cross-sectional view taken along line - in Fig. 1, Fig. 3 is a cross-sectional view taken along line - in Fig. 2, and Fig. 4 is a cross-sectional view taken along line - in Fig. 2. 1: Air cleaner, 2: Case, 3: Left half (integral member), 4: Right half (integral member), 5: Wire, 6, 7, 23, 24
......Groove portion, 15...intake pipe, 25...water separation passage, 32...blow-by gas introduction pipe, 35...drain tube.

Claims (1)

[Claims for Utility Model Registration] In the case of an air cleaner in which a pair of integrally molded members are fitted together and an intake pipe and a blow-by gas introduction pipe are connected, (a) at least one fitting surface has a groove portion; By mutually fitting the pair of integrally molded members 3 and 4 having the grooves, the integrally molded members 3,
(b) One end of the drainage passage 8 is connected to the interior of the case 2 consisting of the pair of integrally molded members 3 and 4 for air intake. (c) One end of the water separation passage 25 is opened to the part where water that has entered from the pipe 15 collects, and the other end is released to the outside of the case 2.
(d) A blow-by gas introduction pipe 32 is connected in the middle of the water separation passage 25.