JPH07315148A - Heat insulator attachment structure of bonnet - Google Patents

Abstract

PURPOSE:To enhance the appearance of a bonnet after the attachment of a heat insulator by fixing the front and rear end parts of a single or a plurality of molding members, respectively to the front and rear edge parts of the bonnet on the inner surface side, and by securing the heat insulator between the molding members and the inner surface of the bonnet. CONSTITUTION:Two molding plate members 13, 14 are laid along the inner surface of an engine bonnet 12 which is provided in the upper surface part of a vehicle body on which an engine is installed, in the longitudinal direction of the hood 12. Further, the front and rear end parts of the molding plate members 13, 14 are fixed respectively to the front and rear edge parts 18, 19 of the bonnet on the inner surface side thereof, and heat insulators 23, 24 are secured between the molding plate members 13, 14 and the inner surface of the bonnet 12. With this arrangement, the molding plate members 13, 14 can be reinforced, and further a laterally reinforcing members 15 is attached to the members 13, 14 spanning therebetween so as to form a frame-like shape. Thus, the rigidity of the frame can be further reinforced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulator mounting structure for an engine bonnet, which is mainly installed in construction machines such as hydraulic excavators and work vehicles.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional front view of a main part of a bonnet soundproofing device disclosed in Japanese Utility Model Publication No. 5-34454. In the soundproofing device shown in FIG. 5, the overlapping portion 4 of the pressing plate 3 is overlapped on the edge 2 of the bonnet 1, and the pressing portion 5 of the pressing plate 3 presses the end portion 7 of the sound absorbing material 6. . Thereby, the sound absorbing material 6 is attached to the bonnet 1 because the end portion 7 is pressed by the pressing portion 5 of the pressing plate 3 and is sandwiched between the sound absorbing material 6 and the bonnet 1.

FIG. 6 is a sectional view of an engine hood 8 showing another embodiment of the prior art. In the figure, 9 is a heat insulating material such as a glass wool material that can exhibit heat insulating and sound absorbing effects, 10 is a washer, and 11 is a so-called insul pin which is provided to lock the heat insulating material 9. In the bonnet 8 shown in FIG. 6, a large number of retaining pins 11 are welded to the inner surface of the hood 8 (the reference numeral a in FIG. 6 is a welded portion), and the retaining pins 11 are bent to attach the heat insulating material 9 to the bonnet. The inner surface of 8 is held.

[0004]

In the bonnet 1 shown in FIG. 5, since the end portion 7 of the sound absorbing material 6 is merely pressed by the holding portion 5 of the holding plate 3, the sound absorbing material 6 is caused by vibration of the vehicle or the like.
May be detached from the inner surface of the bonnet 1. Since the means for interposing an adhesive between the inner surface of the bonnet 1 and the sound absorbing material 6 is also taken into consideration, the above detachment can be prevented, but the holding plate 3 serves to improve the rigidity of the thin bonnet 1. Did not do at all. Further, in the bonnet 8 shown in FIG. 6, since a large number of retaining pins 11 are welded to the inner surface portion thereof, a lot of welding man-hours are required and welding distortion occurs, which adversely affects the surface finish. Not only is it difficult to attach the heat insulating material 9, but also the retaining pin 11
May have been broken or dropped. Moreover, the appearance after mounting the heat insulating material 9 was poor. An object of the present invention is to provide a bonnet heat insulating material mounting structure that can solve the above-mentioned problems.

[0005]

According to the present invention, an engine is mounted on a vehicle body, a bonnet is provided on at least an upper surface of an outer peripheral surface of the vehicle body, and a plate-shaped heat insulating material is attached to an inner surface of the bonnet. In the bonnet insulation mounting structure, a single or a plurality of shaped plate members are provided along the inner surface of the bonnet in the front-back direction of the inner surface of the bonnet, and the front end and the rear end of the shaped plate members are attached to the inner surface of the bonnet. The heat insulating material is fixed between the shaped plate member and the inner surface of the bonnet by being fixedly attached to the front side edge portion and the rear side edge portion, respectively. A small gap is provided between the inner surface of the bonnet and the upper edge of the shaped plate member. Further, a reinforcing shape plate member in the left-right direction is attached over the plurality of shape plate members fixedly attached in the front-rear direction. Further, a strip-shaped shaped plate member is fixedly provided in the front-rear direction on the lower side of the reinforcing shaped plate member, and the heat insulating material is pressed toward the inner surface of the bonnet.

[0006]

According to the present invention, the plate-shaped heat insulating material can be reliably and easily fixed between the inner surface of the bonnet and a single or a plurality of shaped plate members provided in the front-rear direction on the inner surface of the bonnet. Further, the front end and the rear end of the shaped plate member are fixedly attached to the front side edge and the rear side edge on the inner surface side of the bonnet, respectively, and a small amount is provided between the upper end edge of the shaped plate member and the inner surface portion of the bonnet. Since a small gap is provided, deformation such as welding marks on the inner surface side is not caused on the upper surface of the bonnet. Also, since the reinforcing shape plate members in the left-right direction are attached over the plurality of shape plate members fixedly attached in the front-rear direction, not only the plurality of shape plate members can be reinforced, but also the shape plate members are framed. The rigidity of the bonnet can be improved. Further, since a strip-shaped shaped plate member is fixedly provided in the front-rear direction on the lower side of the reinforcing shaped plate member so that the heat insulating material is pressed toward the inner surface of the bonnet, the heat insulating material is more surely attached to the inner surface portion of the bonnet. Can be fixed to.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view of a hood 12 having a heat insulating material mounting structure of the present invention. In the figure, 13,1
4 is a plurality of shaped plate members provided in the front-rear direction on the inner surface of the bonnet 12, 15 is a reinforcing shaped plate member, 16 is a belt-shaped shaped plate member, and 17 is the vehicle body (not shown).
The hinge member is attached to the front of the bonnet 12, the reference numeral F is the front side direction, and the reference numeral R is the rear side direction. FIG. 2 is a plan view of the bonnet 12 (the hinge member 17 is omitted) shown in FIG. FIG. 3 is a sectional view taken along line AA of FIG. In the figure, 18 and 19 are front and rear edge portions on the inner surface side of the bonnet 12, 20 and 21 are mounting seat fittings fixed to the front edge portion 18 and the rear edge portion 19, respectively, and 22 is a shaped plate member 13. Bolts that fasten the front and rear ends of the shaped plate member 14 to the mounting seat fittings 20 and 21, and 23 and 24 are heat insulating materials such as glass wool material that can exhibit heat insulating and sound absorbing effects. Is a reinforcing plate member having a T-shaped cross section (not shown, but may be L-shaped, etc.), 25 is a bolt for fastening the band-shaped plate member 16 to the plate member 15, and the dimension C is the inner surface of the bonnet 12. It is the size of the gap between the section and the upper edge of the shaped plate member 13. FIG. 4 is a sectional view taken along line BB of FIG. In the figure, 26 is a bolt that fastens the front end and the rear end of the strip-shaped plate member 16 to the front and rear edges of the bonnet 12, and 24 and 27 are heat insulating materials.

Next, the heat insulating material mounting structure of the present invention will be described with reference to FIGS. In the present invention, an engine (not shown) is mounted on a vehicle body, an engine bonnet is provided on an upper surface of the vehicle body, and a plate-shaped heat insulating material is attached to an inner surface of the bonnet. In the structure, two shaped plate members 13 and 14 are provided along the inner surface of the bonnet 12 in the front-back direction of the inner surface portion of the bonnet 12.
And the front end and the rear end of the shaped plate members 13 and 14 are fixed to the front edge 18 and the rear edge 19 on the inner surface side of the bonnet 12 (in this embodiment, bolts 22 are tightened. It may be fixed by welding) and attached, and the above-mentioned shaped plate member 1
A heat insulating material is fixed between the inner surface of the hood 12 and the inner surface of the hood 12. Further, a gap of several millimeters (gap dimension C shown in FIG. 3, but the actual suitable size is about 5 millimeters) is provided between the inner surface of the bonnet 12 and the upper edges of the shaped plate members 13 and 14. Further, a reinforcing shape plate member 15 in the left-right direction is attached across the two shape plate members 13 and 14. (In this embodiment, the reinforcing shaped plate member 15 is attached to the two shaped plate members 13 and 14 by welding, but may be attached by bolt tightening not shown). Further, a strip-shaped shaped plate member 16 is fastened to the lower side of the reinforcing shaped plate member 15 in the front-rear direction with bolts 25 so that the heat insulating material is pressed toward the inner surface of the bonnet 12.

Next, the operation of the heat insulating material mounting structure of the present invention will be described. According to the present invention, a plate-shaped heat insulating material can be securely and easily fixed between the inner surface of the bonnet 12 and the plurality of shaped plate members 13 and 14 provided in the front-rear direction on the inner surface of the bonnet 12. Further, the front end and the rear end of the shaped plate members 13 and 14 are fixedly attached to the front side edge portion 18 and the rear side edge portion 19 on the inner surface side of the bonnet 12, and the upper end edges of the shaped plate members 13 and 14 are attached. Since a small gap is provided between the inner surface of the bonnet 12 and the bonnet 12, the upper surface of the bonnet 12 is prevented from being deformed such as a weld mark on the inner surface. Moreover, since the reinforcing shape plate member 15 in the left-right direction is attached over the plurality of shape plate members 13 and 14, the plurality of shape plate members 1
3 and 14 can be reinforced, and the shape plate member 13,
The frames 14 and 15 have a frame shape, and the rigidity of the bonnet 12 can be improved. Further, since the strip-shaped shaped plate member 16 is tightened in the front-rear direction with the bolts 25 below the reinforcing shaped plate member 15 so that the heat insulating material is pressed toward the inner surface of the bonnet 12, the heat insulating material is more reliably bonnetted. It can be fixed to the inner surface portion of 12.

[0010]

According to one embodiment of the prior art, in the heat insulating material mounting structure, since a large number of retaining pins are welded to the inner surface of the bonnet, it takes a lot of man-hours for welding and the welding distortion causes surface finishing. Had a negative effect on. Moreover, not only is it difficult to attach the heat insulating material, but also the locking pin may be broken or fallen off. Moreover, the appearance after installing the heat insulating material was bad. However, in the present invention, the plate-shaped heat insulating material can be reliably and easily fixed between the bonnet inner surface and the singular or plural shaped plate members provided in the front-rear direction on the inner surface portion of the bonnet. Further, the front end and the rear end of the shaped plate member are fixedly attached to the front side edge and the rear side edge on the inner surface side of the bonnet, respectively, and a small portion is provided between the upper edge of the shaped plate member and the inner surface portion of the bonnet. Size (actual size is about 5 mm)
Since the gap is provided, the upper surface of the bonnet will not be deformed such as an inner side welding mark. Also, since the reinforcing shape plate members in the left-right direction are attached over the plurality of shape plate members fixedly attached in the front-rear direction, not only the plurality of shape plate members can be reinforced, but also the shape plate members are framed. The rigidity of the bonnet can be improved. Further, since a strip-shaped shaped plate member is fixedly provided in the front-rear direction on the lower side of the reinforcing shaped plate member so that the heat insulating material is pressed toward the inner surface of the bonnet, the heat insulating material is more surely attached to the inner surface portion of the bonnet. Can be fixed to. Therefore, according to the heat insulating material mounting structure of the present invention, the heat insulating material can be securely and easily mounted, and the rigidity of the bonnet and the appearance after mounting the heat insulating material can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a bonnet having a heat insulating material mounting structure of the present invention.

FIG. 2 is a plan view of the bonnet shown in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a vertical cross-sectional front view of essential parts of a conventional bonnet soundproofing device.

FIG. 6 is a cross-sectional view of an engine hood showing another embodiment of the prior art.

[Explanation of symbols]

 1,8,12 Bonnet 9,23,24,27 Heat insulating material 13,14,16 Shape plate member 15 Reinforcing shape plate member 18 Front side edge portion 19 Rear side edge portion 22,25,26 Bolt

Claims (4)

[Claims] 1. A bonnet heat insulating material mounting structure in which an engine is mounted on a vehicle body, a bonnet is provided on at least an upper surface portion of an outer peripheral surface portion of the vehicle body, and a plate-shaped heat insulating material is attached to an inner surface portion of the bonnet. In the front-back direction of the inner surface of the bonnet, a single or a plurality of shaped plate members are provided along the inner surface of the bonnet, and the front end portion and the rear end portion of the shaped plate members are the front side edge and the rear side of the inner surface of the bonnet. A bonnet heat insulating material mounting structure characterized in that a heat insulating material is fixed between the shaped plate member and the inner surface of the bonnet, respectively, and fixed to each side edge portion. 2. The bonnet heat insulating material mounting structure according to claim 1, further comprising: an inner surface portion of the bonnet;
A heat insulating material mounting structure for a bonnet, characterized in that a small gap is provided between the upper edge of the shaped plate member. 3. The bonnet heat insulating material mounting structure according to claim 1, wherein a lateral reinforcing shape plate member is attached over a plurality of shape plate members fixedly mounted in the front-rear direction. The bonnet insulation material mounting structure featuring 4. The bonnet heat insulating material mounting structure according to claim 1, wherein a strip-shaped shaped plate member is fixed to the lower side of the reinforcing shaped plate member in the front-rear direction, and the heat insulating material is attached to the bonnet. The bonnet insulation mounting structure is characterized in that it is pressed against the inner surface.