JPH0754606Y2 - Vehicle engine intake intake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intake device for an engine such as a truck.

(Prior Art) Generally, a truck, especially a dump truck, often travels in a dusty environment, so the intake air of the engine is sufficiently high from the surface of the earth, not the air near the surface of the dusty surface. It is desirable to take in a relatively clean portion of the air. Therefore, as shown in FIG. 1, a rear wall of the cab 10 of the truck, that is, a rear panel 12, to which an intake pipe 14 made of a hollow cylindrical body extending in the vertical direction is attached has already been put into practical use. There is. A cap member 16 is provided at the upper end opening of the intake intake pipe 14 in order to prevent rainwater and fallen leaves from being sucked in, and the lower end of the intake intake pipe 14 is
It is connected to the intake pipe of the engine via a connecting pipe, an air filter, etc.

Since the intake intake pipe 14 generally has a large cross-sectional area and a thin wall thickness, it is relatively low in rigidity and intake noise having a frequency proportional to the engine speed is likely to be generated, and this vibration is caused by the cab 10. There is a case where a muffled sound that is transmitted to the vehicle and impairs habitability is generated.

(Problems to be Solved by the Invention) The present invention was devised in view of the above circumstances. The side branch that improves the rigidity of the intake intake pipe and positively reduces intake noise is also included. An object of the present invention is to provide an engine intake air intake device for a vehicle, which is formed integrally with an inlet pipe to effectively prevent generation of intake noise and reduce muffled noise in the cab. Is.

(Means for Solving the Problems) In order to achieve the above object, the present invention is directed to an intake intake pipe formed of a hollow cylindrical body vertically arranged along a side wall of a cab, having an appropriate length from its upper end. An upper pipe member that extends downward and is composed of a plurality of divided pipes that are coupled to each other, and a lower pipe member that is a common pipe that communicates with the plurality of divided pipes. At least one
It is an object of the present invention to propose an engine intake air intake device for a vehicle, which is formed as a side branch whose upper end opening is closed to reduce intake noise.

(Operation) According to the present invention, the intake intake pipe has an upper pipe member formed of a plurality of divided pipes extending downwardly from the upper end thereof and a lower pipe formed of a common pipe communicating with the plurality of divided pipes. And a member. Since the plurality of divided pipes are coupled to each other, the rigidity is significantly increased as compared with a single hollow cylindrical body having a large cross-sectional area, and the vibration of the upper pipe member is effectively suppressed. Further, at least one of the above-mentioned split pipes is formed as a side branch by closing the upper end opening thereof, so that an effect of reducing intake noise is produced.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. (Note that duplicate description is omitted for items already described with reference to FIG. 1.) As shown in the detailed side view of FIG. 2 and the detailed front view of FIG.
14 is composed of from its upper end H ₁ and the upper tube member 14a extending over a length L to a lower position H _2, from the lower position between H ₂ below the lower tube member 14b.

The upper pipe member 14a is composed of a plurality (two in the illustrated case) of divided pipes 16 and 18, and the divided pipes 16 and 18 are integrally joined along a joining line 20 by welding, bonding or other appropriate means. There is. On the other hand, the lower pipe member 14b is composed of a single common pipe communicating with the split pipes 16 and 18, as clearly shown in the sectional view of FIG.

As shown in FIG. 4, the upper end opening of one of the divided pipes 18 is closed by an end member 22, and the upper end opening of the other divided pipe 16 is open to the atmosphere and serves as an intake port.

According to the above-mentioned configuration, the intake air of the engine (not shown) arranged above the cab 10 in FIG. 1 receives the split pipe 16 of the upper pipe member 14a from the gap between the cap member 16 and the intake intake pipe 14.
Then, it flows into the intake pipe of the engine from the lower pipe member 14b through a connecting pipe and an air filter (not shown). Since the upper pipe member 14a is composed of the plurality of divided pipes 16 and 18 integrally coupled to the joining line 20, the rigidity is higher than that of a single hollow cylindrical body or pipe, and vibration is effective. Suppressed.

One of the divided pipes, that is, the divided pipe 18 in the illustrated case, has an upper end opening closed by an end member 22, and thus can function as a side branch. The main component of the intake noise of the intake intake pipe 14 is the primary explosion component of the engine and is proportional to the engine speed, but the above-mentioned side is adjusted so as to match the noise frequency that is the main cause of the muffled noise of the cab 10. By setting the length L of the branch, it is possible to reduce the intake noise of the frequency and effectively reduce the muffled noise due to the intake noise of the cab 10.

Next, FIG. 7 shows an upper pipe member 14 showing a second embodiment of the present invention.
It is a transverse cross-sectional view of a and corresponds to FIG. 5 of the first embodiment. As shown in the figure, the upper pipe member 14a is provided with a partition wall 24 in a single tube to form the split tubes 16 and 18, and these split tubes 16 and 18 are naturally integrally connected by the partition wall 24. Has been done. One split pipe
18, the upper end is closed to form a side branch as schematically shown by hatching in the drawing, and the upper end opening of the other split pipe 16 is open to the atmosphere.

Also in this embodiment, the rigidity of the upper pipe member 14a is improved by integrally connecting the split pipes 16 and 18, and the length L of the split pipe 18 forming the side branch is appropriately set. Effectively reduces intake noise,
It is possible to obtain the same effect as that of the embodiment.

In the first and second embodiments, the upper pipe member
Each of the 14a is composed of two divided pipes, but it is of course possible to form three or more divided pipes.

(Effects of the Invention) As described above, in the engine intake intake device for a vehicle according to the present invention, the intake intake pipe formed of a hollow cylindrical body arranged vertically along the side wall of the cab is provided from the upper end of the intake pipe. The upper pipe member is formed of a plurality of divided pipes that extend downward by an appropriate length and are coupled to each other, and the lower pipe member is formed of a common pipe communicating with the plurality of divided pipes. Characterized by the fact that at least one of the split pipes is formed as a side branch whose upper end opening is closed to reduce intake noise. With a simple configuration, intake noise is reduced and cab muffled noise is effectively reduced. Therefore, it is practically useful.

[Brief description of drawings]

FIG. 1 is a schematic side view of a truck cab to which the present invention is applied, FIG. 2 is a side view of an intake intake pipe according to a first embodiment of the present invention, and FIG. 3 is an intake intake shown in FIG. Front view of immigration,
4 is a plan view seen from the direction of arrow IV in FIG. 3, FIG. 5 is a sectional view taken along line VV in FIG. 3, and FIG. 6 is VI- in FIG.
FIG. 7 is a sectional view taken along line VI, and FIG. 7 is a sectional view similar to FIG. 5 showing a second embodiment of the present invention. 10 …… Truck cab, 12 …… Cab rear wall, 14 ……
Intake pipe, 14a ... upper pipe member, 14b ... lower pipe member,
16 and 18 …… Split tubes.

Claims (1)

[Scope of utility model registration request] 1. An intake intake pipe made of a hollow cylindrical body arranged vertically along a side wall of a cab, and consisting of a plurality of divided pipes extending downwardly from an upper end of the intake pipe by a suitable length. And a lower pipe member composed of a common pipe communicating with the plurality of divided pipes, and at least one of the plurality of divided pipes has its upper end opening closed to reduce intake noise. A vehicle engine intake intake device, characterized in that it is formed as a side branch that reduces.