JPS60183230A - Suction device of engine for cab-over type vehicle - Google Patents

Abstract

PURPOSE:To enable prevention and control of the generation of filling noise in a cab, by a method wherein the opening of a dust cover, attached to the upper part of a suction pipe located upright between a cab and a load-carrying platform, is disposed so that it points to the outside in the lateral direction of a vehicle. CONSTITUTION:A suction device 3 is positioned between a cab 1 and a load-carrying platform 2 situated therebehind, and is provided with a suction pipe 4, installed upright, and a dust cover 5 situated to the upper part thereof. In which case, the dust cover 5 has an opening 8 pointing to the ouside in the lateral direction of a vehicle. A suction pipe 4 is secured to a bottom wall 5a of the dust cover 5, and a suction port 6 is formed in the upper part of the suction pipe 4 in a direction extending opposite to that of the opening 8. This causes pulsating noise to be dispersed toward the outside in the lateral direction of the vehicle, resulting in the possibility to prevent enterance of the pulsating noise into a gap between the cab 1 and the load-carrying platform 2. This enables prevention of the occurrence of a resonance phenomenon between the cab 1 and the load- carrying platform 2 and the generation of filling noise in the cab 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system "L" for an engine in a cab-over type vehicle.

The intake device that supplies air into the combustion chamber of the engine can be placed in several locations depending on the vehicle model, but in cab-over type vehicles, it is usually located between the cab 1 and the loading platform 2, as shown in Figure 1. This intake 'JA station 3 is provided in the space. In this case, the intake pipe 4 of the intake device 3 is erected in a chimney-like manner in the space for the cab/cargo platform, and a guest cover 5 is placed above the intake pipe 4. As is clear from FIG. 2, the dust cover 5 covers the upper part of the suction port 6 opened at the upper end of the intake pipe 4, and prevents rainwater, dirt, dust, etc. from entering from the suction port 6. . guest cover 5
is supported by the intake pipe 4 by the stay 7, outside air is taken in through the opening 8 on the lower side of the cover 5, and the air that has flowed into the dust cover 5 flows into the pipe from the suction port 6 of the intake pipe 4 (the air The direction of flow is opposite to the direction of the arrows shown in Figures 1 and 2).

According to the above-mentioned intake device 3, it is possible to suppress the inconvenience of rainwater, dirt, dust, etc. being sucked in, and also to suppress the sucking of hot air emanating from the engine, thereby reducing the intake air filling density into the combustion chamber (not shown) of the engine. can be prevented. However, as a result of recent studies, it has become clear that the conventional intake system of this type causes a so-called muffled noise of 2 m inside the cab 1. The causes are generally considered to be as follows.

The flow rate of air flowing in from the intake section, that is, the opening 8 and the suction port 6, is not always constant, but usually fluctuates at a predetermined period corresponding to the operation of the engine piston (not shown). . For this reason, a slight pulsating sound is generated in the intake section during intake. This sound emanates downward through the suction port 6 and the opening 8 as indicated by the arrows in FIGS. 1 and 2. However, the intake device 3 is connected to the gear l rear wall (back panel or rear glass) la and the loading platform 2.
Since the cab 1 is sandwiched between the front end wall 2a of the cab 1 and the front end wall 2a of the cab 1, a cavity resonance phenomenon occurs due to the pulsating sound emitted as described above, and this is cursed as a loud muffled sound inside the cab 1.

The present invention has been made based on the above-mentioned novel recognition, and its purpose is to provide an air intake device that can suppress the generation of muffled noise more than ever before.

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

The intake device 3 according to the present invention shown in FIG. It has a dust cover 5 provided. This dust cover 5 is
As shown in the figure, it has an opening 8 facing outward in the lateral direction of the vehicle, and all parts other than this opening 8 are closed, and the intake pipe 4 is fixed to the bottom wall 5a. Further, in this example, the suction port 6 located at the upper part of the intake pipe 4 opens in the opposite direction to the opening 8.

The outside air is taken in through the opening 8 of the guest cover 5 and the suction port 6 of the intake pipe 4, which itself is no different from a conventional intake device. However, in the configuration according to the present invention, since the opening 1'' 8 of the guest cover 5 faces outward in the lateral direction of the vehicle, the pulsating noise generated during intake is caused by the pulsation noise occurring in the vehicle as shown by the arrows in FIGS. 3 and 4. This is prevented or suppressed from spreading outward in the lateral direction and entering the gap between the cab 1 and the loading platform 2. For this reason, the cab
The resonance phenomenon between the loading platforms is suppressed, and the inconvenience of muffled noise inside the cab 1 is reduced.

Furthermore, in this example, since the suction port 6 of the intake pipe 4 is directed to the opposite side to the direction in which the opening 8 opens, an advantage can be obtained that the pulsation generated at the suction port 6 can be suppressed from emanating from the opening 8.
It is also possible to prevent rainwater, dirt, dust, etc. from entering through the opening 8 from directly entering the suction port 6.

According to the present invention, a simple configuration in which the opening of the dust cover is directed outward in the lateral direction of the vehicle is adopted.

It is possible to suppress the generation of muffled noise inside the cab.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a cab-over type vehicle having a conventional intake device, FIG. 2 is a perspective view showing details of the intake device shown in FIG. 1, and FIG. 3 has an intake installation according to the present invention. FIG. 4 is a partial perspective view of the cab-over type vehicle, and is a perspective view showing details of the intake device shown in FIG. 3. . 1... Cab 2... Loading platform 3... Intake device 4... Intake pipe 5... Dust cover 6... Suction port 8... Opening Applicant Hino Motors Co., Ltd. Figure 1 ζi+ 2 Figure No. 31 No. 4 1J

Claims (1)

[Claims] It has an intake pipe installed in the shape of a chimney between the cab and the loading platform, and a dust cover provided on two parts of the intake pipe. 43. An intake system for an engine in a cab-over type vehicle which takes in air through the engine, characterized in that the opening l'' of the guest cover is disposed toward the outside in the lateral direction of the vehicle.