JPH04303077A - Sound arrester for mobile farm machinery cabin - Google Patents

Abstract

PURPOSE:To prevent any offensive noise from reaching to ears of a driver in a way of interrupting a low-frequency noise passing through a glass surface among noises emitted out of an engine, by sticking a damping member to a front part of almost the same position as a projecting surface to the front of a meter panel. CONSTITUTION:A cabin 3 is attached onto the rear of a main frame 1 provided with an engine in the front via plural dampers 2, and a meter panel 5 is installed inward a windshield 4 installed in a front vertical wall of the cabin 3. In addition, a damper member 6 is stuck to the windshield 4 at almost the same position as a projecting surface to the front of the meter panel 5. With this constitution, since a low-frequency noise emitted out of the engine 7 is interruptible, any offensive noise will in no case reach to ears of a driver after being reverberated and amplified in an inner space of the meter panel 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor soundproofing system for a cabin in which a driver of a mobile agricultural machine sits.

0002

BACKGROUND OF THE INVENTION Conventional cabins do not have damping material attached to the windshield, but a name or mark is simply attached to cover a portion of the cabin interior.

0003

[Problems to be Solved by the Invention] Such prior art devices cannot block low-frequency noise that passes through the glass surface of the noise generated by the engine, and unpleasant noise reaches the driver's ears.

0004

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems of the conventional device, and takes the following technical measures. That is, the engine 7 is in the front.
A plurality of vibration isolators 2, 2. ．． At the driver's seat, a windshield 4 is provided on the front vertical wall of the cabin room 3, and a meter panel 5 is installed inside the windshield 4. The structure of the soundproofing device for a cabin room of a mobile agricultural machine is characterized in that a damping material 6 is attached to 4 parts of the windshield at approximately the same position as the forward projection surface of the panel 5.

[0005]

Effects of the Invention The present invention has the following technical effects due to the above-described configuration. That is, a part of the noise generated from the engine 7 reaches the windshield 4, and the damping material 6 blocks the low-frequency noise that attempts to pass through the glass surface, causing unpleasant noise to reverberate in the interior space of the meter panel 5. The signal will not be amplified and reach the driver's ears.

[0006]Furthermore, although vibrations are generated in the cabin 3 due to road irregularities during driving, the vibration damping material 6 suppresses the chattering noise of the windshield 4 itself, which also contributes to reducing the vibration noise of the vehicle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be explained in detail by way of example with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the component parts described in this example are not intended to limit the scope of this invention to only those, unless there is a specific description. , is merely an illustrative example.

The illustrated example shows a cabin 3 of an agricultural tractor 8.
This invention is incorporated into the above. The illustrated agricultural tractor 8 has an engine 7 disposed between left and right front wheels 9 in a forward position, and a clutch housing 10 protruding rearward. Inside this clutch housing 10,
Although not shown, a drive shaft equipped with a clutch device for turning on and off the driving force of the engine 7 is provided.

A transmission case 11 is attached to the rear of the clutch housing 10.
The left and right rear wheels 12, 12 are driven through the transmission transmission device inside the vehicle. These are the engine 7 and the clutch housing 1.
0 and the transmission case 11 are integrated through connectors such as bolts and nuts, and constitute the main frame 1.

A plurality of vibration isolators 2 are installed above the rear half of the main frame 1.
,2. ．． ．． A cabin room 3 is attached via the. The cabin room 3 has a ceiling wall 13 at the top, a floor plate consisting of a lower floor 14, an upper floor 15, and a connecting vertical wall 16 at the bottom, a rear window wall 17 at the rear, and a windshield 4 at the front.
It consists of a front vertical wall with a main body, and left and right opening/closing doors (not shown) are attached to the sides.

As shown in FIGS. 2 and 3, the front vertical wall portion includes a lower partition wall 18 that bulges out toward the inside of the cabin room 3 at the middle lower part in the left-right direction, and a lower front wall provided on the left and right outer sides of the lower partition wall 18. It consists of glasses 19, 20 and the aforementioned windshield 4 provided above the lower partition wall 18. 21, 22
are left and right column frames, which are supporting frames that hold the end surfaces of the windshield 4 and the lower windshields 19, 20.

A driver's seat 23 and a steering wheel 24 are also provided inside the cabin 3. handle 24
A meter panel 5 is provided nearby, and the driver can drive while checking the instruments (not shown) installed in the meter panel 5. Upper end 5a of meter panel 5
is located above the lower edge 4a of the windshield 4 with a certain gap 25 to the windshield 4, and the front of the meter panel 5 is open.

In FIG. 1, a damping material 6 is attached to the inner surface of the windshield 4, which is the gap 25, and this damping material 6 prevents the interior from being seen through the front opening of the meter panel. ing. The damping material 6 is a material that is applied to the surface of a member to suppress internal noise from dispersing to the outside or to suppress generation of vibration in the member to which it is applied, and is commercially available from paint manufacturers and the like.

On the other hand, the sides and top of the engine 7 are covered with a bonnet 26. As shown in FIG. 3, the upper edge of the bonnet 26 extends upward so as to hide the front opening of the meter panel 5. 4 and 5 show another embodiment in which a damping material 6 is attached to the front part of the meter panel 5 above the lower edge 4a of the windshield 4 outside the cabin room 3. .

FIG. 4 shows the damping material 6 attached directly to the glass surface, and FIG. 5 shows the damping material 6 attached via an elastic body 27 such as urethane rubber. It is efficient if the size of the vibration damping material 6 is slightly larger than the front projection surface of the meter panel 5, but even if it is small, a certain effect will be produced, and even if it is very large, there is no particular problem.

28 is a sealing body, and the bonnet 26
The rear edge and the windshield 4 and lower windshield 19
, 20.

[Brief explanation of drawings]

The figure shows an embodiment of the invention.

[Figure 1] Cross-sectional side view of main parts

[Figure 2] Perspective view of main parts

[Figure 3] Overall side view with partial section

[Fig. 4] Cross-sectional side view of main parts of the first alternative embodiment

[Fig. 5] Cross-sectional side view of main parts of the second alternative embodiment

[Explanation of symbols]

1 Main frame 2. Vibration isolators 3 Cabin room 4. Windshield 5 Meter panel 6 Damping material 7 Engine

Claims (1)

[Claims] Claim 1: A plurality of vibration isolators 2, 2 . ．． At the driver's seat, a windshield 4 is provided on the front vertical wall of the cabin room 3, and a meter panel 5 is installed inside the windshield 4. This soundproofing device for a cabin of a mobile agricultural machine is characterized in that a damping material 6 is attached to 4 parts of the windshield at approximately the same position as the forward projection surface of the panel 5.