JPH0830453B2 - Air cleaner device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air cleaner device for cleaning intake air of an engine.

[Prior art]

Conventionally, in an air cleaner device for a motorcycle, a hollow cylindrical element is inserted into an opening provided in an air cleaner case, and an outside air inlet opening at the end face of this element is located inside the opening. In addition, the opening and the inlet are covered with a lid fitted in the air cleaner case, and a duct for sucking outside air is formed in the lid, and the downstream end opening of the duct is used as the inlet. A structure in which they are opposed to each other is known.

[Problems to be Solved by the Invention] However, in this conventional air cleaner device, since there is a step or space between the inlet of the element and the downstream end opening of the duct, the flow of the intake outside air However, there was a problem that the air intake resistance was increased because it was disturbed in the space and the step.

In order to eliminate such a problem, it is sufficient to provide a projection that closes the space on the inner surface of the lid and form a smooth flow path for the intake air, but then, the dimensions of the components that make up the air cleaner Due to tolerances and mounting errors,
When assembling this air cleaner, another problem arises in that the projection interferes with surrounding parts such as the lid.

Therefore, conventionally, it was very difficult to make the flow path of the intake air into a smooth shape due to the above-mentioned dimensional restrictions.

[Means for solving problems]

Therefore, in the present invention, between the end surface of the element and the lid, there is flexibility, and a ring-shaped packing having a communication hole connected to the introduction port of the element is interposed,
A guide surface that smoothly connects the inlet and the downstream end opening of the duct is formed on the inner peripheral surface of the opening of the communication hole of the packing.

[Action]

According to this structure, since the space between the element and the lid is filled with the separate packing having flexibility, the relative position between the lid and the element is changed due to the dimensional tolerance and the mounting error of the components of the air cleaner. Even if it changes, the packing itself is elastically deformed to automatically absorb the dimensional tolerance and the mounting error. For this reason, the components such as the lid body do not interfere with each other, so that the space or the step that disturbs the flow of the intake air can be accurately filled, and the downstream side opening of the duct part to the element. The flow path of the intake outside air can be made into a smooth shape.

Example of Invention

Hereinafter, an embodiment of the present invention will be described with reference to the drawings applied to a motorcycle.

A frame denoted by reference numeral 1 in FIG. 4 has a pair of left and right main frame members 3 extending rearward from the steering head pipe 2 and a down tube 4, and between the main frame member 3 and the down tube 4. The engine 5 is mounted on the. A cylinder 6 of the engine 5 is largely tilted forward, and a down-draft type carburetor 7 and an air cleaner 8 are arranged above the cylinder 6.

The details of the air cleaner 8 will be described with reference to FIGS. 1 to 3. The air cleaner 8 includes a substantially box-shaped air cleaner case 9. The air cleaner case 9 includes an upper case 10 and a lower case 11. It is divided in two. At the rear part of the bottom surface 11a of the lower case 11, there is provided a joint 12 penetrating to the intake passage of the carburetor 7,
This joint 12 is an internal space 13 of the air cleaner case 9.
It is open to.

A circular opening 14 that opens to the internal space 13 is formed in the front portion of the upper surface of the upper case 10, and a cylindrical element 15 is inserted inside the opening 14. The element 15 of the present embodiment includes a filter paper 16 that is folded in a radial shape, and has a ring-shaped bottom plate 17 adhered to the lower end surface of the filter paper 16.
However, it is airtightly in contact with the bottom surface 11a of the lower case 11 via the sealing material 18. A holding plate 19 is adhered to the upper end surface of the filter paper 16, and an outer peripheral edge portion of the holding plate 19 is airtightly hooked and held by the opening peripheral edge portion of the opening portion 14 via a sealing material 20. An inlet 21 for the intake outside air, which communicates with the space 28 surrounded by the filter paper 16, is opened in the center of the holding plate 19, and the inlet 21 is coaxially positioned inside the opening 14. ing.

Further, a lid 22 that covers the openings 14 and the upper end surfaces of the elements 15 is fitted to the front portion of the upper surface of the upper case 10. The lid 22 has a dish shape that opens downward and has an outer peripheral wall 23.
The lower surface of the upper case 10 and the upper surface of the outer peripheral portion of the holding plate 19 are overlapped, and the upper surface 24 of the lid 22 and the holding plate.
A space 25 corresponding to the rising height of the outer peripheral wall 23 exists between the space 19 and the space 19. A duct portion 26 extending rearward is integrally formed at the center of the upper surface of the lid body 22.
26 projects above the upper surface 24 of the lid 22. The rear end of the duct portion 26, that is, the intake upstream end forms an outside air intake 27 that opens rearward, and the downstream end opening 29 of the duct portion 26 faces above the introduction port 21 of the element 15. It is connected to the above space 25.

A screw 30 is inserted from above in the central portion of the upper surface of the lid body 22, and the screw 30 is inserted into the introduction port 21 and the space.
Nut 3 that penetrates 26 and is embedded in the bottom surface 11a of the lower case 11.
Screwed into 1. Therefore, when the screw 30 is tightened, the element 15 is sandwiched between the lid 22 and the lower case 11, and the lid 22 is tightened and fixed to the front portion of the upper surface of the upper case 10.

By the way, a ring-shaped packing 33 is interposed between the upper surface 24 of the lid 22 and the holding plate 19 of the element 15. The packing 33 of the present embodiment is made of a soft and flexible material such as rubber, and is composed of the lid 22 and the holding plate.
It is interposed in a compressed state between 19 and the space 25 between them.
Are buried. A communication hole 34 is formed at the center of the packing 33 so as to face the introduction port 21 of the element 15, and the inner peripheral surface of the opening of the communication hole 34 has an opening edge portion of the introduction port 21 and a downstream end opening portion. A guide surface 35 that connects the opening edges of the 29 with a smooth curve is formed.

According to such a configuration, the space 25 created between the lid 22 and the element 15 is covered with the flexible packing 33 which is a separate body.
Since it was filled with, the lid 22 and the element 15
Even if the relative position between the lid 22 and the element 15 and the size of the space 25 changes due to dimensional tolerances and mounting errors of the air cleaner components such as, the packing 33 itself deforms and the above dimensional tolerances and Installation error will be automatically absorbed.

Therefore, the lid 22 and the upper case 10 cannot be prevented from being aligned with each other, and the packing 33 and surrounding parts do not interfere with each other, so that the space 25 that disturbs the flow of the intake air can be accurately filled. .

At the same time, the packing 33 has a guide surface 35 that connects the introduction port 21 and the downstream end opening 29 of the duct portion 26 with a smooth curve.
The flow path of the intake outside air can be made into a smooth shape, and the flow resistance of the intake outside air is reduced together with the filling of the space 25, and efficient intake is possible.

In the above-described embodiment, the air cleaner case has a separate structure from the motorcycle frame, but in carrying out the present invention, the air cleaner case is also a hollow box-shaped frame made of pressed steel. You may let me.

Furthermore, the air cleaner device according to the present invention is not limited to a motorcycle, but can be similarly applied to other vehicles such as a motorcycle or a motorcycle.

〔The invention's effect〕

According to the invention described in detail above, it is possible to accurately fill a space or a step that disturbs the flow of the intake air without being influenced by the dimensional tolerance and installation error of the air cleaner. The flow path of the intake outside air can be made smooth. Therefore,
The flow resistance of the intake air is reduced, and efficient intake is possible.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a cross-sectional view of an air cleaner, FIG. 2 is a plan view with a lid removed, and FIG.
The drawing is a sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a side view of the motorcycle. 5: engine, 9: air cleaner case, 14: opening, 15: element, 21: inlet, 22: lid,
29 …… downstream end opening, 33 …… packing, 34 …… communication hole,
35 ... Information board.

Claims (1)

[Claims] 1. An air cleaner case having an opening communicating with an intake passage of an engine is provided with an opening, and an element having a hollow cylindrical shape is inserted into the opening to introduce an outside air inlet opening at an end face of the element. , Located inside the openings, and covering the openings and the end surfaces of the elements with a lid fitted to the air cleaner case, forming a duct for sucking outside air in the lid, An air cleaner device having a downstream end opening facing the inlet of the element, having flexibility between the end surface of the element and the lid,
In addition, a ring-shaped packing having a communication hole communicating with the introduction port of the element is interposed, and a smooth gap between the introduction port and the downstream end opening of the duct is provided on the inner peripheral surface of the opening of the communication hole of the packing. An air cleaner device, characterized in that a guide surface is formed to connect to.