JPH0413231Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an intake duct device for an internal combustion vehicle engine in an automobile.

[Conventional technology] In small truck engines, the suction port is placed under the floor of the cab where it is protected from raindrops, but in large trucks, the amount of air intake increases, so a suction port with a sufficient opening area is placed under the floor. It is difficult to do so, and even if it is installed under the floor, there is a risk that water will enter the suction port when washing the car or driving on rough roads, which will shorten the life of the air purifier element.

Therefore, in the air intake device disclosed in, for example, Japanese Utility Model Application Publication No. 52-39917, the suction port is provided at the upper end of a duct that stands up on the rear wall of the cab. In other words,
A plurality of guide walls with an inverted L-shaped cross section are arranged almost horizontally inside the hood, and air sucked in horizontally is applied to the guide walls to separate raindrops. Raindrops are drained outside from the drain groove. However, since the guide wall is arranged in the center of the air passage, even if raindrops that hit the guide wall are guided to the drain groove, there is a risk that they will be agitated by the air and overflow from the drain groove.

The intake duct device disclosed in Japanese Utility Model Application Publication No. 58-82929 has the lower end of a tubular intake nozzle curved in an inverted L shape narrowed and fitted onto the upper end of a duct rising along the rear wall of the cab. A protrusion is provided that does not touch the outer peripheral surface of the duct. The intake air drawn into the intake nozzle hits the inner peripheral wall of the intake nozzle at the curved part, and the raindrops in the intake air flow down along the inner peripheral wall, and flow into the duct from the gap between the outer peripheral wall of the duct and the protrusion of the intake nozzle. Flows down to the outside.

In the above-mentioned intake duct device, since the duct opens into the intake nozzle or the inner space of the hood, that is, the curved part of the passage, the opening area of the connection between the intake nozzle and the duct is very narrow. , there are problems such as large intake resistance and the risk of producing intake noise.

[Problems to be solved by the invention] The purpose of the invention is to effectively separate raindrops inside the hood by widening the opening area of the intake port of the hood and the passage area of the connecting part between the hood and the duct body. An object of the present invention is to obtain an intake duct device that allows air to flow out to the outside of a hood.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the present invention is such that a vertically elongated, almost rectangular shape is installed on the upper peripheral wall of the duct body, which is closed at the top and stands upright along the rear wall of the cab. An opening is provided, vertical drainage grooves are integrally formed on both side edges of the opening, the cross section of the passage is vertically elongated and approximately rectangular, and the internal passage has a suction port at the tip and is curved in the shape of a quarter-circular arc. The base end of the hood is connected to the opening of the duct body so as to cover the drain groove except for the lower end.

[Function] Since the internal passage connecting the suction port of the hood and the opening of the duct body is curved in a quarter-circle shape, raindrops in the intake air adhere to the wall of the hood and flow along the wall with the intake air. The raindrops are blown toward the drain grooves provided on both side edges of the opening of the duct body, flow out from the drain grooves to the outside, and are prevented from being sucked into the duct body.

[Embodiment of the invention] As shown in Fig. 1, the intake duct device of the engine is installed upright along the rear wall of the cab 2, and the air sucked in from the intake grille 3a that opens to the side of the vehicle body is The air flows downward along the duct body 4 and is introduced into the air cleaner 5. In the illustrated example, the upper end portion of the duct body 4 is curved slightly forward along the rear wall surface of the cab 2.

FIG. 2 is a rear view of the duct body 4. Three brackets 7 (see FIG. 3) formed on both sides of the upper and lower ends of the duct body 4 are fixed to the rear wall of the cab 2 with bolts. The lower end of the duct main body 4 has an oval cross section, while the upper half is integrally formed with a projecting wall 15 and a guide wall 16 that project toward the side of the vehicle body, and a flange 18 is formed at the intersection of the two. (See Figure 4).

As shown in FIG. 4, on the front wall of the duct body 4,
A vertically elongated and substantially oval opening 8 having a peripheral edge 8a projecting forward from the wall surface is provided. As shown in FIG. 2, the opening 8 is slightly inclined in the longitudinal direction of the duct body 4 and extends long.

As shown in FIG. 4, vertical drainage grooves 9 and 10 are formed integrally with the duct body 4 at both side edges of the opening 8. The lower ends of the drain grooves 10 and 9 are located at the second
As shown in the figure, they merge with each other and communicate with a water drain port 12 opened downwardly in the duct main body 4. A projecting wall 17 projecting forward from the side of the drain groove 9 is connected to the guide wall 16.

A hood 24 is coupled to the opening 8 of the duct body 4. The hood 24 has a substantially oval vertical cross section (passage cross section), and has a suction port 3 with a grille 3a at one end.
is formed, and cooperates with the guide wall 16 and the projecting wall 17 to form the 4
It has an internal passage that curves in a semi-circular arc.

The end of the hood 24 is overlapped and coupled to the flange 18 and the front wall of the duct body 4. That is,
One half of the edge of the suction port 3 that supports the grille 3a is overlapped and joined to the flange 18, and the opposite half has a guide wall 24a curved in a four-semi-circular shape from the suction port 3 toward the opening 8. An end of the guide wall 24 a is coupled to the front wall of the duct body 4 so as to cover the drain groove 10 . In this way, the opening 8 of the duct body 4 and the drain grooves 9, 10 are connected to the hood 24 and the projecting wall 17.
However, the lower ends of the drain grooves 9 and 10 are open to the outside of the duct body 4. Preferably, the drain groove 13 projects further forward than the guide wall 16 .
A baffle plate 25 having a baffle plate 25 is coupled to the projecting wall 17. The lower end of the drain groove 13 communicates with the drain port 12.

The duct main body 4 is integrally formed with an opening 8, a projecting wall 15, a guide wall 16, a projecting wall 17, and drainage grooves 9 and 10 by blow molding from a tube made of synthetic resin. The baffle plate 25 molded from synthetic resin is supported by the projecting wall 17 with adhesive, bolts, etc.
Further, the hood 24 molded from synthetic resin is bonded to the duct body 4 with adhesive or the like.

The direction of the suction port 3 is substantially perpendicular to the opening 8 of the duct body 4, and raindrops are removed from the air sucked through the suction port 3 before reaching the opening 8. That is, the air in the inner circumference hits the guide wall 16 and the baffle plate 25 to separate raindrops, and the raindrops adhering to the guide wall 16 flow down along the drainage groove 13 formed in the baffle plate 25. In addition, the air around the outside is removed from the guide wall 2.
4a, the raindrops adhering to the guide wall 24a are blown toward the drain groove 10 along the guide wall 24a by the air flow, and are removed from the drain port 12.
and is discharged to the outside of the duct body 4.

The baffle plate 25 is placed forward of the opening 8 and towards the suction port 3.
It protrudes almost to the center axis of the suction port 3.
The air containing raindrops is not directly guided to the opening 8, and the raindrops that are being taken in are not guided directly to the guide wall 16 and the baffle plate 2.
5. The air adheres to the guide wall 24a, flows down along the wall surface, is blown into the drain grooves 9 and 10, and is discharged to the outside from the drain groove opening 12, so that the raindrops are completely removed from the intake air and the air flows into the duct body. 4 will be introduced.

[Effects of the invention] As described above, the present invention provides a vertically elongated, approximately rectangular opening in the upper peripheral wall of the duct main body, which stands upright along the rear wall of the cab and is closed at the top, and extends from both side edges of the opening. A vertical drainage groove is integrally formed in the part,
The proximal end of the hood, which has a vertically elongated, almost rectangular passageway cross section and a suction port at the tip and an internal passageway curved into a quarter-circle arc, covers the opening of the duct body except for the lower end of the drain groove. Because they are connected in this way, the whole can be easily molded from synthetic resin, the number of parts is small, and assembly is easy.

Since the hood is provided over the vertical opening of the duct body, the area of the suction port of the hood and the passage area of the connecting part between the hood and the duct body can be widened, so that the intake resistance is small and there is no problem of intake noise.

Since the internal passage connecting the suction port of the hood and the opening of the duct body is curved in a four-semi-circular shape, raindrops in the intake air hit the inner circumferential wall of the hood and adhere to it, and are swept away by the intake air flow, causing damage to the hood and the duct body. The water flows down to the outside along the drainage groove at the edge of the opening that communicates with the water.

Since raindrops can be prevented from being sucked into the duct body, the service life of the air purifier can be extended and damage caused by engine water hammer can be prevented.

[Brief explanation of the drawing]

1 is a side view of a vehicle equipped with an intake duct device according to the present invention, FIG. 2 is a rear view of the same intake duct device, FIG. 3 is a plan view of the same, and FIG. 4 is a line taken along the line of FIG.
FIG. 5 is a perspective view of the same. 3... Suction port, 4... Duct body, 8... Opening, 9, 10, 13... Water drain groove, 12... Water drain port, 15, 16... Guide wall, 24... Hood,
24a...Guide wall, 25...Baffle board.

Claims (1)

[Scope of utility model registration request] A vertically elongated, approximately rectangular opening is provided in the upper peripheral wall of the duct body, which stands upright along the rear wall of the cab and has a closed top end, and vertical drainage grooves are integrally formed on both side edges of the opening. , the proximal end of the hood, which has a vertically elongated cross section and a nearly rectangular shape, has a suction port at the tip, and an internal passage curved into a four-semi-circular arc, and the opening of the duct body, excluding the lower end of the drain groove An intake duct device for a vehicle engine, characterized in that the air intake duct device is connected in a covering manner.