JPH057523U - Intake stack duct - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an intake stack duct having high rigidity, which can suppress an increase in intake resistance of an engine and can be manufactured at low cost. An intake stack duct 3 for introducing combustion air into an engine, the intake stack duct 3
And a reinforcing member 8 which is inscribed in and is fixed to the intake stack duct 3 by a rivet 9 or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake stack duct for introducing combustion air into an engine of a vehicle such as a truck.

[0002]

[Prior Art]

 The intake stack duct for introducing combustion air to the diesel engine of the truck is installed vertically along the back of the truck cabin, and its intake port is provided on the side surface of the upper part of the stack duct to prevent rainwater, dust, etc. It is prevented from being sucked into the stack duct. The intake stack duct is usually formed of a synthetic resin such as polypropylene resin into a hollow cylindrical shape, and its cross-section has various shapes such as a square, a triangle, and a circle.

[0003]

[Problems to be solved by the device]

 When the engine is in the intake stroke, the inside of the intake stack duct becomes negative pressure. Therefore, if the thickness of the intake stack duct is small, its rigidity will be insufficient and the duct will dent inside. Since the intake process of the engine is repeated at regular intervals, the stack duct with insufficient rigidity causes vibrations as the engine rotates, and this vibration penetrates into the inside of the truck cabin from the back of the truck cabin and becomes indoor noise.

In recent years, there has been an increasing demand for transportation vehicles such as trucks to improve riding comfort and reduce noise in the cabin. Therefore, in order to reduce the noise caused by the vibration of the intake stack duct, the thickness of the stack duct is increased and the cross-sectional area of the intake passage is reduced to improve its rigidity. However, if the wall thickness of the intake stack duct is increased or the cross-sectional area of the intake passage is decreased, the intake resistance of the engine increases. In addition, the increase in wall thickness of the intake stack duct also increases the manufacturing cost.

Therefore, an object of the present invention is to provide an intake stack duct having high rigidity that can suppress an increase in intake resistance of an engine and can be manufactured at low cost.

[0006]

[Means for achieving the object]

 In order to achieve the above object, the intake stack duct of the present invention is characterized by having a reinforcing member inscribed in the intake stack duct and fixed to the intake stack duct.

Since such a reinforcing member is made of a thin metal plate or the like, it does not increase the intake resistance of the intake stack duct. Further, since it is not necessary to attach this reinforcing member to the entire intake stack duct, it is sufficient to install it only in a location where rigidity is insufficient, so that an increase in manufacturing cost can be suppressed.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cabin 2 of a truck 1, and an intake stack duct 3 is installed vertically along a back surface 2 a of the cabin 2. The stack duct 3 is made of polypropylene resin so as to be hollow, and has an intake passage 3a therein. The intake passage 3a extends in the longitudinal direction of the stack duct 3.

A top surface 3b of the stack duct 3 is inclined downward toward the rear of the truck 1, and an intake port 3c opening toward the rear of the truck 1 is formed on the upper side surface of the stack duct 3. .. A louver 4 is installed at the intake port 3c to prevent rainwater from entering.

The lower end of the stack duct 3 is connected to an air cleaner 6 of the engine via a rubber boot 5, and the lower end of the stack duct 3 and the rubber boot 5 are fastened by a rubber boot clip band 7. The rubber boot 5 is formed into a flexible bellows shape so that the stack duct 3 can be tilted together with the cabin 2 when the cabin 2 is tilted in the direction A in FIG. 1 for maintenance and inspection of the engine.

As shown in FIG. 3, the stack duct 3 of this embodiment has a triangular shape as a whole, and the stack duct 3 has a particularly low rigidity, that is, in the vicinity of the connecting portion between the stack duct 3 and the rubber boot 5. A reinforcing member 8 is installed in the stack duct 3 so as to be in contact with the inner surface of the stack duct 3. The reinforcing member 8 is made of a thin metal plate and has a circular cross section as a whole. As shown in FIG. 3, the reinforcing member 8 is in contact with the inner surface of the stack duct 3 at three points, and the inscribed points are fixed by rivets 9, respectively.

Since the reinforcing member 8 firmly supports the inner surface of the stack duct 3, the stack duct 3 is prevented from being dented inward even if a negative pressure is generated in the intake passage 3a.

Although the stack duct 3 of the above embodiment has a triangular cross-sectional shape as a whole and the reinforcing member 8 has a circular cross-sectional shape as a whole, the stack duct 3 and the reinforcing member 8 have the same shape. It is not limited to such a shape.

[0015]

[Effect of the device]

 As described above, according to the intake stack duct of the present invention, since the reinforcing member that is inscribed in the intake stack duct and fixed to the intake stack duct is provided, it is possible to prevent the intake stack duct from vibrating during intake of the engine. Can be prevented. Therefore, it is possible to reduce the noise in the cabin.

Further, since the reinforcing member is formed of a thin metal plate or the like and is installed so as to be inscribed on the inner surface of the intake stack duct, it does not increase the intake resistance of the engine. Furthermore, since it is not necessary to attach this reinforcing member to the entire intake stack duct, it is sufficient to install it only in a location where rigidity is insufficient, so that an increase in manufacturing cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a side view of a truck cabin provided with an intake stack duct.

FIG. 2 is a perspective view of a connecting portion between an intake stack duct and a rubber boot.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a perspective view of an example of a reinforcing member.

[Explanation of symbols]

 1 truck 2 cabin 3 intake stack duct 3a intake passage 3c intake port 5 rubber boot 6 air cleaner 8 reinforcing member 9 rivet

Claims (1)

Claims for utility model registration: 1. An intake stack duct for introducing combustion air into an engine, having a reinforcing member inscribed in the intake stack duct and fixed to the intake stack duct. Intake stack duct.