JPH0643487Y2 - Connection device for atmospheric intake pipe to air cleaner for internal combustion engine - Google Patents

Description

The present invention relates to a device for connecting an atmospheric air intake pipe to an air cleaner in an internal combustion engine when introducing atmospheric air into the air cleaner. .

[Conventional technology]

When connecting an air intake pipe to a side surface of an air cleaner in an internal combustion engine, forming a cross section at the connecting portion into an oval or elliptical shape having a horizontal direction of a long diameter and a vertical direction of a short diameter is a prior art. It is well known as described in Japanese Utility Model Publication No. 60-110667.

When the cross section of the connection portion of the air intake pipe to the side surface of the air cleaner is formed in an oval shape or an elliptical shape as described above, the height dimension of the air cleaner can be reduced, and the air cleaner can be reduced in size and weight. At the same time, there is an advantage that the flow resistance of the atmospheric air from the atmospheric intake pipe to the air cleaner can be reduced.

[Problems to be solved by the device]

However, on the other hand, if the cross section of the connection of the air intake pipe to the air cleaner is formed into an elliptical or elliptical shape with the horizontal direction being the major axis, the strength of the ceiling plate and bottom plate of the air intake pipe is significantly reduced, and the negative pressure is reduced. Is deformed inward by the air cleaner, and a gap is created between it and the socket for connection on the air cleaner side, so that atmospheric air is sucked in from this gap, which not only increases noise, but also the upper surface of the ceiling plate of the air intake pipe. By sucking the water accumulated in the air cleaner into the air cleaner through the gap together with the atmospheric air, the filter element in the air cleaner is damaged.

An object of the present invention is to solve the problem in the case where the connecting portion of the air intake pipe to the air cleaner has an oval shape or an elliptical shape.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides a connection portion of the air intake pipe to the side surface of the air cleaner to an elliptical or elliptical shape having a major axis in the lateral direction, while the air intake pipe is connected to a socket for connection in the air cleaner. A bottom plate of the atmosphere intake pipe is attached to the connection socket by at least one detachable rivet, while the bottom plate of the atmosphere intake pipe is attached to the upper surface of the ceiling plate of the atmosphere intake pipe. The projection extending in the lateral direction along the tip surface of the connection socket is integrally formed.

[Function and effect of device]

In this way, by fixing the bottom plate of the air intake pipe to the connection socket of the air cleaner with at least one removable rivet, the bottom plate of the air intake pipe is deformed inward by negative pressure. Since it can be adhered to the inner surface of the connection socket and the gap between the bottom plate and the connection socket in the air intake pipe can be closed, intake of atmospheric air from the gap can be reduced.

In addition, the ceiling plate in the air intake pipe is formed by integrally forming a protrusion extending laterally along the tip surface of the connection socket on the upper surface of the ceiling plate in the air intake pipe.
Reinforced by the protrusions, the inward deformation due to negative pressure is reduced, and it is possible to make close contact with the inner surface of the connection socket, and it is possible to reduce intake of atmospheric air from between the ceiling plate and the connection socket, and The protrusion serves as a so-called weir for water accumulated on the upper surface of the ceiling plate, and functions to prevent the water from being sucked into the air cleaner from between the ceiling plate and the connection socket.

Therefore, according to the present invention, when the connection portion of the air intake pipe to the side surface of the air cleaner is formed into an elliptical or elliptical shape having a long diameter in the lateral direction, an increase in noise due to intake of atmospheric air from the connection portion and the connection thereof. This has the effect of reliably reducing damage to the filter element due to suction of water from the portion.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a dust side case 2 at a lower portion and a clean side case 3 at an upper portion, which are detachably joined with a filter element 4 interposed therebetween. Reference numeral 5 denotes an air cleaner, and reference numeral 5 denotes an air intake pipe made of synthetic resin for introducing atmospheric air into the dust side case 2 of the air cleaner 1.

On the outer surface of the dust side case 2 of the air cleaner 1, a connecting socket 6 having an oval cross section with a horizontal direction of a long diameter D and a vertical direction of a short diameter d is integrally formed.

In addition, the cross section of the connecting end portion 7 of the air intake pipe 5 is also
Formed into an oval shape having the same size as the connection socket 6,
The connection end portion 7 is detachably inserted into the connection socket 6.

Then, the bottom plate 6a of the connection socket 6 and the bottom plate 7a of the connection end portion 7 of the atmosphere intake pipe 5 are attached by a single rivet 8 that is detachably attached, while the atmosphere intake pipe 5 is attached. On the upper surface of the ceiling plate 7b at the connection end portion 7, a projection 9 extending laterally along the tip surface 6c of the ceiling plate 6b of the connection socket 6 is integrally formed.

Thus, the bottom plate 7a at the connecting end 7 of the air intake pipe 5 is
Is the bottom plate 6a of the socket 6 for connection in the air cleaner 1.
The bottom plate 7a at the connection end 7 of the air intake pipe 5 can be brought into close contact with the inner surface of the connection socket 6 by engaging with the removable rivet 8.

In addition, the ceiling plate 7b at the connection end 7 of the atmosphere intake pipe 5
On the top surface of the ceiling socket 6b of the connection socket 6
By integrally forming the protrusion 9 extending along the 6c, the ceiling plate 7b at the connection end portion 7 of the air intake pipe 5 is reinforced by the protrusion 9 to prevent inward deformation due to negative pressure. At the same time, the projection 9 functions as a weir that prevents water accumulated on the upper surface of the ceiling plate 7b from flowing toward the connection socket 6 along the ceiling plate 7b.

The number of the rivets 8 is not limited to one as shown in the drawings of the embodiment, and a plurality of rivets 8 may be provided. Further, in the present invention, the cross section at the connection socket 6 and the connection end portion 7 is elliptical. It goes without saying that it can be applied to the case.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a vertical sectional front view, Fig. 2 is a sectional view taken along line II-II of Fig. 1, and Fig. 3 is III-I of Fig. 1.
It is a II sectional view. 1 ... Air cleaner, 2 ... Dust side case, 3 ...
… Clean side case, 4 …… Filter element,
5 ... Atmosphere intake pipe, 6 ... Connection socket, 7a ... Atmosphere intake pipe bottom plate, 7b ... Atmosphere intake pipe ceiling plate, 8 ... Rivet, 9 ... Protrusion.

Claims (1)

[Scope of utility model registration request] 1. A connection portion of an air intake pipe to a side surface of an air cleaner is formed into an oval shape or an ellipse shape having a major axis in a lateral direction, and the air intake pipe is inserted into a connection socket of the air cleaner. In the connection device, the bottom plate of the atmosphere intake pipe is attached to the connection socket with at least one removable rivet, while the connection socket is provided on the upper surface of the ceiling plate of the atmosphere intake pipe. A device for connecting an atmospheric air intake pipe to an air cleaner for an internal combustion engine, characterized in that a projection extending in a lateral direction along the tip surface of the is integrally molded.