JP2000052889A - Inner roof and roof structure of cabin for traveling power vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid booming noise of a cabin, particularly low frequency resonance by pressure-bonding fiber plates, particularly nonwoven fabric plates, as sound absorbing material to form an inner roof. SOLUTION: Storage space 14 for an air conditioner 15 or the like is formed by an inner roof 12 and an outer roof 13. The inner roof 12 is formed by pressure-bonding fiber plates. The fiber plates are formed of knitted riber material or nonwoven fabric with a resin, an adhesive or a binder applied or impregnated, pressure-bonded at the pressing temperature of about 200 deg.C and hardened to be integrated. In compression molding, the skin is of thin-walled structure large in compressibility, and the cabin outer face side is integrally formed as a soundproof layer. PE nonwoven fabric is used as the skin, and polyester fiber is used as the soundproof layer. Booming noise of a cabin is therefore damped to attain silent driving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner roof and a roof structure of a cabin for a driving motor vehicle, and more specifically, to a device capable of expecting noise reduction (sound absorbing effect) in the cabin. . Here, the traveling motor vehicle refers to a tractor, a backhoe, a front loader, and the like (the same applies hereinafter).

[0002]

2. Description of the Related Art A so-called tractor with a cabin, which has a cabin surrounding a driving section of a motive power vehicle, for example, a two-axis four-wheel tractor, is known. This cabin has a roof mounted on an upper portion of a cabin frame body, and vibration (noise) is generally attenuated by being elastically supported on a vehicle body by mount rubber or the like.

[0003]

The roof of the conventional cabin is made of plastic, especially an inner roof and an outer roof, and particularly made of reinforced plastic mixed with tempered glass. Vibration), especially low frequency resonance.

[0004] Noise (vibration) sources include engine combustion noise (usually 100 Hz) and running vibration. When this noise is trapped in the cabin, the operator's whole body vibration and local vibration (February 20, 1996, first edition, first edition) Printing issuance, Biological Production Machine Handbook, pages 304 to 306), which is a factor of operator fatigue.

Accordingly, the present inventors have avoided the 100 Hz vibration resonance by increasing the thickness of the lower left and right windshields in the cabin, reduced the noise by forming the floor mat, which is the floor slab of the cabin, with a sound absorbing material and a sound insulating sheet, and improved the engine performance. As a result of repeated experiments on the improvement of combustion and the improvement of dynamic fuel injection timing, it was found that it was effective in reducing cabin noise.

[0006] However, if the roof constituting the ceiling of the cabin (the inner hollow roof including the inner roof and the outer roof) is made of reinforced plastic or sheet metal, it is difficult to absorb or attenuate the booming noise in the cabin. I found that there was. The invention relates to a roof, in particular,
It is an object of the present invention to provide an inner roof capable of avoiding booming noise of a cabin, particularly low-frequency resonance by adopting a sound absorbing material as a constituent material of the inner roof, and a cabin roof using the same.

Further, the present invention provides a fiber board material as a sound absorbing material,
In particular, it is possible to provide an inner roof which is made of a non-woven cloth material by compression molding (compression molding) while ensuring sufficient strength while being lightweight, and capable of avoiding low-frequency resonance, and a cabin roof using the same. Is the purpose.

[0008]

The inner roof according to the present invention is characterized in that, in order to achieve the above-mentioned object, a fiberboard material is compression-molded. Since the inner roof thus configured has a sound absorbing function, the noise can be reduced by absorbing the muffled sound in the cabin and avoiding low-frequency resonance. By the connection, sufficient strength can be ensured while being lightweight (claim 1).

As the fiberboard material, a fiberboard material obtained by coating a knitted fabric with a binder or the like can be used, but it is advantageous to use a nonwoven fabric, and in particular, it is recommended to use a PE nonwoven fabric. (Claim 2). The fiberboard material (sheet) is formed by laminating at least two or more sheets and integrating them, and the fiberboard material (sheet) on the inner surface side of the cabin, which is the skin, is formed by pressure bonding to the fiberboard material (sheet) on the outer surface side of the cabin. It is recommended that the cabin be provided with a sound absorbing layer on the outer surface side of the cabin (claim 3).

By adopting such a configuration,
The skin of the inner roof on the inner surface side of the cabin is rigid and rich in smoothness, while the outer surface side is somewhat softer than the skin, improving the sound absorbing effect. Further, the inner roof is provided with openings for air-conditioner intake holes, blow-off holes, operation panel mounting, and the like on its plate surface. By forming the opening, the periphery of the opening becomes a hardened rib-shaped rim, and the mounting parts for the air conditioner blower, the room lamp, the spotlight, etc. can be made strong (claim 4).

In addition, the screw fastening portion of the inner roof and / or the screw fastening portion of the auxiliary device with respect to the inner roof are formed into a hardened portion having a thin-walled structure by press-molding the plate surface into unevenness, so that the thinned portion has unevenness. Depending on the hardened part of the structure, auxiliary equipment (air conditioner (refers to air conditioner, cooling,
This means that the positioning of the blowers, room lamps, spotlights, etc.) for heating, ventilation, etc.) is assured, and the fastening action by the screw fastening portion is less likely to be disturbed. Claim 5).

Furthermore, it is desirable that a duct for an air conditioner is adhered to the back surface of the inner roof (claim 6). The roof according to the present invention is the same as the inner roof according to any one of claims 1 to 6. On the other hand, the outer roof is mounted to form an accommodation space for air conditioners, etc., and the sound reflected by the outer roof after passing through the inner roof is attenuated by the back side of the inner roof. The roof constructed in this way can store the air conditioner such as an air conditioner and its auxiliary equipment in the accommodation space in a compact manner, but can reliably attenuate the sound reflected on the outer roof and reduce noise. Was able to be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cabin 2 surrounding a driving control unit 1 of a traveling motor vehicle exemplified by a tractor, and the cabin 2 is mounted on a vehicle body 3 via rubber elastic supports at four front, rear, left and right locations. Things.

The driving control section 1 includes a control handle 1A provided at the rear end of the engine bonnet 4 and a vehicle body 3 between right and left rear wheel fenders 5 erected inside the left and right rear wheels.
And a driver's seat 1B provided above. As shown in FIG. 3, the cabin 2 has a skeleton 6 framed in a rectangular parallelepiped (box shape), left and right doors 7 mounted on the skeleton 6, right and left side glasses 8, a rear window glass and a windshield, and a skeleton. It mainly comprises a roof 9 serving as a ceiling of the cabin mounted on the upper end frame 6A of the body 6.

The skeletal body 6 is mounted on the vehicle body 3 via an elastic support with a pair of left and right front columns 6B and a pair of right and left rear columns 6C standing upright on a machine frame extending in the front-rear direction. The struts 6D are erected from the left and right rear wheel fenders 5 and the upper ends of these struts are connected by a rectangular upper end frame 6A. The left and right doors 7 are screwed into the left and right intermediate struts 6D.
The opening and closing portion of the door 7 is substantially an entrance 11.

The roof 9 constituting the ceiling of the cabin 2 has
It is mainly composed of an inner roof 12 and an outer roof 13 having a substantially square shape in a plan view. As shown in FIGS. 2 and 5, the inner roof 12 and the outer roof 13 have an air conditioner (air) inside. An accommodation space 14 such as a harmony machine 15 is formed. As shown in FIGS. 2 and 3, the air conditioner device 15 includes an air conditioner body 16 connected to an unillustrated compressor or the like provided near the engine, and a branch-type air conditioner connected to a rear portion of the air conditioner body 16. The air introduction duct 17 and the air introduction duct 1
7, a blower duct unit 19 containing a blower 18 connected to the rear of the air conditioner 7, a side outlet duct 20 connected to the left and right sides of the air conditioner main body 16, and a front center of the air conditioner main body 16. The main part is composed of a front blow-off duct 21 and the like which are connected to the main body.

The air conditioner body 16 includes an evaporator, a temperature control damper, an air outlet switching damper, and the like.
An internal air filter 22, an external air filter 23, an internal / external air switching damper 24, and the like are provided. The inner roof 12
It is constituted by compressing (compressing) a fiberboard material (including a fiber sheet).

Here, the fiber board material (fiber sheet) is a knitted fabric or non-woven cloth of fibers, and the sheet (non-woven cloth) is coated or impregnated with a resin, an adhesive, a binder, or the like. It is cured and integrated by compression (compression) molding (press molding) at a pressure temperature of about 200 ° C. Here, in the compression molding, the skin (inner surface of the cabin) is a thin-walled structure with a high compression ratio, and the outer surface side of the cabin is integrally formed as a soundproof layer. Desirably, a PE non-woven fabric is used as the skin and the soundproof layer is Polyester fiber is used, and the total (total) thickness is about 10 m / m, of which the skin is 3 mm and the soundproof layer is about 7 mm.

That is, the fiberboard material (sheet) is formed by laminating at least two or more sheets and integrating them, and the fiberboard material (sheet) on the inner surface side of the cabin serving as the skin is compared with the fiberboard material (sheet) on the outer surface side of the cabin. It is formed into a thin structure (hard thin layer) by compression (compression) molding at a high height, and the cabin outer surface side is a sound absorbing layer. Specifically, the skin 12A is made of 200 mm of 3 mm thick polyester cotton.
g / m ² ± 20 g / m ² , acrylic fluorine 7 g / m ² was applied as a surface treatment agent, and the lining 12B was treated with an olefin hot melt treatment. On the other hand, for the intermediate layer (sound absorbing layer) 12C, 50% polyester cotton and 160 ° C.
A 50% polyester fused fiber having a thickness of 20 mm is heat treated to make the thickness 40 mm or more. The inner roof 12 has a basic thickness of 10 mm and a mark portion (such as a screw fastening portion) is 3 mm. Molded.

As shown in FIG. 4, the inner roof 12 has an intake hole (mounting hole for an internal filter) 25 formed at the center of the rear left and right sides thereof, and a spotlight is attached to one side of the intake hole 25. A hole 26 is formed, and a left and right outlet hole 27 is provided at a front-rear intermediate portion on the left and right sides at an interval in the front-rear direction.
R and 27L are formed respectively, and further, mounting holes 28R and 28L of the speaker are formed at the left and right ends of the front side portion, respectively, and the front blowing holes 29R and 28R are spaced apart from each other between the mounting holes 28R and 28L. 29L are respectively formed,
A room lamp mounting hole 30 is formed between the one speaker mounting hole 28R and the one left and right blow-out hole 27R, and an air conditioner, a radio-cassette, a wiper, etc. Operation panel (operation panel)
Are formed side by side in the left-right direction.

Intake hole 25, mounting holes 26, 27R, 27
L, 28R, 28L, 30 and 31 are all openings, which are formed on the plate surface of the inner roof 12 by press punching and the like, and as exemplified by mounting holes 25, 29R and 29L, The periphery of the opening (periphery) is formed with a rib-shaped rim 32 which is compression molded and hardened. The four sides on the front, rear, left and right sides of the inner roof 12 are also compression-molded as a thin hardened layer as the rib-shaped rims 32, and the four corners 33 on the front, rear, left and right are formed along the outer surface shape of the columns 6B, 6C in this embodiment. The inner roof 12 is formed together with the outer roof 13 on the front and rear edge portions 32 while being pressed into a step shape.
A screw fastening portion 34 for screw fastening or the like is formed into a hardened portion 35 having a thin-walled structure by compression-molding the plate surface of the inner roof 12 into irregularities, and this hardened portion 35 is attached to the speaker in FIGS. 6 and 7. As exemplified by the hole 28R, the screw fastening portion 34 of the auxiliary device (speaker) is also formed as a hardened portion 35.

By forming the hardened portion 35 as the thinnest portion in an uneven manner in this way, bolts, screws, and the like are screwed into the screw fastening portion 34, and auxiliary devices (speaker, inside air filter, spotlight, Sufficient strength is secured for mounting the blowing nozzle, etc.), and sufficient strength is secured for fastening the inner roof 12 and the outer roof 13 with screws.

Further, as shown in FIG.
An inner roof 12 formed by compression-molding three nonwoven fabrics has a skin 12A and a back skin 12B formed in a thinnest portion, and an intermediate portion is a sound absorbing layer 12C made of polyester fiber or the like. When the roof 9 is formed by forming the housing space 14 by the roof 12 and the outer roof 13 formed of a sheet metal press or a high-strength plastic press or the like, sound reflected by the outer roof 13 after passing through the inner roof 12 is transmitted to the inner roof 12. This is configured to be attenuated by the back skin 12B and the sound absorbing layer 12C.

Further, as shown in FIG. 3, left and right outlet ducts 36R, 36R are provided on the back skin 12B of the inner roof 12.
L is fixed by bonding or other means so as to cover the left and right outlet holes 27R and 27L. The front and left and right outlet holes 29R and 29R are provided on the back skin 12B of the inner roof 12.
The air outlet duct 37 is fixed by bonding or other means so as to cover L. The ducts 36R, 36R, 37
Are made of hard resin, and the air conditioner body 1
The ducts 20 and 21 of No. 6 are mounted in a communicating manner via a seal ring 38 as shown in FIG.

In the above configuration, when the air conditioner main body 16 is activated, the blower 18 operates to introduce air through the inside air filter 22 or the outside air filter 23, cool and heat the air in the air conditioner main body 16, and supply air to the outlets 27R, 27L. It circulates in the cabin 6 from the same. This air conditioner body 1
6 is attenuated by the sound absorbing layer 12C of the inner roof 12, and engine noise, the muffled sound in the cabin 2 due to running vibration, etc. are reduced by the sound absorbing layer 1 of the inner roof 12.
Damping at 2C guarantees operation under a quiet ring.

On the other hand, the inner roof 12 is made of a fiberboard material,
The fiber sheet is formed by compression (compression bonding), and while maintaining the strength as a roof while being lightweight, the rib rim and the screw fastening part are increased in pressure bonding rate and thinned to form a hardened part, so screw fastening Was sufficient, and the mounting strength of auxiliary devices etc. was secured.

[0027]

As described in detail above, according to the present invention, the muffled noise of the cabin can be attenuated and quiet operation is possible, and the weight can be reduced and the weight of the cabin can be reduced to improve the fuel efficiency. The required strength can be secured while it can be done.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor cabin.

FIG. 2 is a sectional view of a roof in a tractor cabin.

FIG. 3 is an exploded perspective view of a roof in the tractor cabin.

FIG. 4 is a perspective view of an inner roof in the tractor cabin.

FIG. 5 is a cross-sectional view of a roof in a tractor cabin.

FIG. 6 is a partially enlarged plan view of an inner roof in a tractor cabin.

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a partial sectional view of the inner roof.

[Explanation of symbols]

 2 Cabin 9 Roof 12 Inner Roof 13 Outer Roof

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yuichi Kitao 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Works (72) Inventor Tsuyoshi Imamura 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Takanori Sakai 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. Person Mitsuo Okamoto 64 Term, Ishizu-Kitacho, Sakai City, Osaka Prefecture F-term in Kubota Sakai Works Co., Ltd. (Reference)

Claims (7)

[Claims] 1. An inner roof of a cabin for a traveling power vehicle, wherein a fiberboard material (sheet) is formed by pressure bonding. 2. The inner roof of a cabin for a driving motor vehicle according to claim 1, wherein the skin of the fiberboard material (sheet) is made of PE non-woven fabric. 3. The fiberboard material (sheet) is formed by laminating at least two or more sheets, and is integrated with the fiberboard material (sheet) on the inner surface side of the cabin, which is the skin, with respect to the fiberboard material (sheet) on the outer surface side of the cabin. The inner roof of a cabin for a traveling motor vehicle according to claim 1 or 2, wherein the inner surface of the cabin is formed as a sound absorbing layer on the outer surface side of the cabin. 4. An opening for air-conditioner air intake and exhaust holes, an operation panel attachment, and the like is formed on the inner roof, and a rib hardened by pressure-forming around the opening. The inner roof of a cabin for a driving motor vehicle according to any one of claims 1 to 3, wherein the inner roof is formed in a rounded portion. 5. The thin-walled hardened portion of the inner roof screw-fastened portion and / or the screw-fastened portion of the auxiliary device with respect to the inner roof is formed by pressing a plate surface into unevenness. The inner roof of the cabin for a driving motor vehicle according to any one of claims 1 to 4. 6. An air conditioner duct is adhered to a back surface of the inner roof.
An inner roof of a cabin for a driving motor vehicle according to any one of the above. 7. The inner roof according to claim 1, further comprising an outer roof mounted therein to form an accommodating space for an air conditioner or the like, and a sound reflected by the outer roof after passing through the inner roof. A roof structure of a cabin for a traveling power vehicle, wherein the cabin is configured to be attenuated by a back surface side of the vehicle.