JPS586061B2 - Air cleaner for internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cleaner for an internal combustion engine that includes a cleaner cap and a cleaner case made of synthetic resin.

In conventional air cleaners, the cleaner case and cleaner cap are made of iron plates, but in order to reduce the weight of the vehicle and facilitate processing, it has been proposed to make the cleaner case and cleaner cap of synthetic resin.

However, cleaner cases and cleaner caps made of synthetic resin have the disadvantage of decreasing strength and creep deformation at high temperatures, which can cause air leakage from gaskets and loosening of wing nuts. This was the biggest hurdle in converting cleaner cases and cleaner caps to synthetic resins.

An object of the present invention is that both the cleaner case and the cleaner cap that is placed over the cleaner case are made of synthetic resin, and that the intake air travels radially inward through a space defined by the opposing inner surfaces of the cleaner case and the cleaner cap. In an air cleaner for an internal combustion engine that is guided from the center of the cleaner case to the carburetor, the purpose of the present invention is to prevent a decrease in strength and creep deformation of the cleaner case and the cleaner cap at high temperatures.

To achieve this object, according to the air cleaner for an internal combustion engine of the present invention, a carburetor is provided on the opposing inner surfaces of a cleaner case and a cleaner cap that face each other and define an intake passage space for intake air that advances radially inward. Ribs are provided that extend radially with respect to the central axis of the inlet end, and the ribs of the cleaner case and the ribs of the cleaner cap are spaced apart in the direction of the central axis.

A practical example of the present invention will be explained based on the drawings.8 A cleaner case 1 has an inlet 2 that guides intake air into the cleaner case 1.
, a baffle plate 3 that evenly distributes the intake air led from the inlet 2, a side plate portion 4, and a plurality of ribs 5,
And they are integrally molded.

An opening 6 is provided in the center of the cleaner case 1.
The cleaner case 1 is attached to the carburetor via a gasket 11 so that the air horn portion 7 of the carburetor is located downstream of the air cleaner.

Assuming that the central axis of the inlet end of the carburetor, that is, the air horn section 7, is 12, the side plate 4 is provided so as to form a circle centered on the axis 12, and is arranged a predetermined distance inward from the side plate 4. The filter elements 13 are arranged so as to form a circle, also centered on the axis 12.

The plurality of ribs 5 extend radially from the periphery of the opening 6 to the filter element 13 at equal angular intervals about the axis 12 .

The cleaner cap 14 has a hole 15 in the center, and includes a plurality of ribs 16 and is integrally formed.

The cleaner cap 14 has a hole 15 and a stud bolt 17.
A stud bolt 17 is passed through the cleaner case 1 by a wing nut 21 and is attached upwardly in FIG. 1 of the cleaner case 1. 1, the ribs 16 extend radially about the axis 12 and at equal angular intervals up to the filter element 13.

The ribs 5 and 16 are separated in the direction of the axis 12, that is, a gap is formed between the ribs 5 and 16 in the direction of the axis 12.

A gasket 22 is provided between the cleaner cap 14 and the filter element 13, and a gasket 22 is provided between the cleaner case 1 and the filter element 13.
A gasket 23 is provided between each of them to prevent air leakage.

The space partitioned by the filter element 13 and the side plate portion 4 constitutes a circular passage 24 .

As shown by the arrows in FIG. 2, the air drawn into the air cleaner from the inlet 2 collides with the baffle plate 3 and is divided into two directions and uniformly distributed within the passage 24.

The intake air in the channel 24 is cleaned by passing through the filter element 13 and flows radially to the opening 6 from which it is led to the carburetor.

Since the ribs 5 and 16 are provided radially around the axis 12, the ribs 5 and 16 do not obstruct the flow of intake air.

Thus, in the air cleaner of the present invention, the ribs 5 and 16 are made of synthetic resin in the cleaner case 1 and the cleaner cap 1.
4, the strength does not decrease or creep deformation occurs due to heat conducted from the internal combustion engine, and air leakage from the air cleaner is prevented.

Furthermore, the ribs 5 and 16 are provided radially around the central axis 12 of the air horn section 7, and do not interfere with the smooth flow of intake air, so that they are prevented from adversely affecting the operation of the internal combustion engine. .

If the ribs 5 and 16 contact or overlap in the direction of the axis 12, the intake passage in the air cleaner will be partitioned radially, causing an increase in intake resistance, but in the present invention, the ribs 5 and 16 are separated in the direction of the axis 12, a gap is formed between them in the direction of the axis 12, and the intake passage in the air cleaner is not partitioned radially, so that intake resistance can be reduced.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention in cross section;
The figure is a plan view of an embodiment of the present invention shown with the cleaner cap removed. DESCRIPTION OF SYMBOLS 1... Cleaner case, 5... Rib, 7... Air horn part, 12... Axis line, 14... Cleaner cap, 16...
…rib.

Claims (1)

[Claims] 1. Both the cleaner case and the cleaner cap that is placed over the cleaner case are made of synthetic resin, and the intake air travels inward in the radial direction through a space defined by the opposing inner surfaces of the cleaner case and the cleaner cap. In the air cleaner for an internal combustion engine that is guided from the center to the carburetor, the opposing inner surface of the cleaner case and the opposing inner surface of the cleaner cap each have ribs extending in a radial direction with respect to a central axis of an inlet end of the carburetor. An air cleaner for an internal combustion engine, wherein the rib of the cleaner case is separated from the rib of the cleaner case in the direction of the central axis.