JPS6242141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a proximity sound insulating plate installed in an automobile engine for the purpose of reducing radiated noise.

Generally speaking, in order to reduce the noise radiated from the outer surface of an automobile engine, as shown in FIG. It is installed, and this proximity sound insulation board 2
The peripheral edge 3 of the cylinder block 1 is bent inward to prevent noise leakage as much as possible, and to prevent the adjacent sound insulation plate 2 itself from becoming a secondary sound source due to vibration propagation from the cylinder block 1. It is elastically supported on the cylinder block 1. That is, as shown in FIG. 2, a cylindrical rubber mount 6 with metal threaded parts 4 and 5 at both ends is used, and the threaded part 4 at one end is connected to the cylinder at several appropriate locations on the proximity sound insulating plate 2. The proximity sound insulating plate 2 is fastened to the threaded portion 5 at the other end of the rubber mount 6 screwed into the block 1 with a nut 7.

However, in such a conventional configuration, when the surface shape of the engine is complex, it is difficult to secure the mounting seat surface of the rubber mount 6 at a suitable position, that is, a position where vibration input is small. Moreover, when fastening the proximal sound insulating plate 2 with the nuts 7, the screw portions 5 must be inserted into the through holes 8 of the proximal sound insulating plate 2 one by one, making the installation work extremely troublesome.

The present invention was made in view of these conventional problems, and it is an object of the present invention to provide a proximity sound insulating plate that can be easily and reliably installed regardless of the surface shape of the engine and has a good noise reduction effect. purpose.

That is, in the proximity sound insulation plate for an automobile engine according to the present invention, the proximity sound insulation plate is molded from a high damping material, and the outer edge portion and the pressed portion are provided with a convex portion for contacting the engine surface,
On the other hand, the proximal end of a bracket having spring properties is fixed to a part of the engine, and the distal end is brought into pressure contact with the pressed part, and the proximity sound insulating plate is pressed and fixed to the outer surface of the engine by this bracket. It is.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

3 and 4, 12 is the cylinder block of the engine 11, 13 is the oil pan, 1
4 has one end attached to the cylinder block 12 with bolt 1.
The engine mount bracket is shown fixed at 5 and 16. Further, reference numeral 17 denotes a proximal sound insulating plate attached to the side surface of the cylinder block 12, and 18 a bracket for press-fixing the proximal sound insulating plate 17. The proximal sound insulating plate 17 is made of a high damping material with excellent vibration damping properties. The cylinder block 12 is formed into a predetermined shape corresponding to the outer shape of the cylinder block 12. A rib 19 is provided on the outer edge portion 17a, and a pressed portion 17b is pressed against the bracket 18.
A boss portion 20 is formed as a convex portion to protrude toward the cylinder block 12, so that a predetermined gap 21 is maintained between the adjacent sound insulating plate 17 and the outer surface of the cylinder block 12. There is. In addition, the above-mentioned high damping material is made by blending organic fibers such as wool, nylon, Tetron, or acrylic, or inorganic fibers such as glass fibers with resins such as acrylic resins and phenol resins, and crosslinking agents (binder) such as formalin. Examples include those molded under heat and pressure, rubber such as NBR, and synthetic resins such as polyurethane foam, polyethylene, and polystyrene. In addition, the above bracket 1
8, as shown in detail in FIG. 6, is formed by connecting a disc-shaped base end 22 and distal ends 23, 23 with band-shaped arm parts 24, 24 having spring properties. The end portion 22 is fastened together with the bolt 15 of the engine mount bracket 14, and the claw portion 2
The tip portions 23, 23 having 3a abut against the pressed portion 17b of the proximity sound insulating plate 17, and press and fix this to the cylinder block 12. FIG. 5 is an enlarged view of the pressed portion 17b. The pressed portion 17b having the boss portion 20 has a relatively shallow large-diameter recess 25 and a relatively deep small-diameter recess 26 in the center. The bracket tip 23 fits into the recess 25, and the claw 23a further engages with the recess 26. That is, the tip portion 23 presses the proximal sound insulating plate 17 with a relatively wide area to prevent excessive surface pressure from being applied, and the engagement between the claw portion 23a and the recess 26 prevents the proximal sound insulating plate 17 from being applied. 17 is prevented from moving and can be securely fixed at a predetermined position.

Therefore, according to the above structure, even if the surface shape of the cylinder block 12 to which the proximity sound insulating plate 17 is mounted is complicated, it is not necessary to process the seat surface or the like here, so it can be easily attached. 18 and the engine mount bracket 14, there is no need to add any new machining to the engine cylinder block 12, etc. Furthermore, the pressed portion 17b, which serves as a vibration propagation path from the cylinder block 12, can be arbitrarily set at a portion of the cylinder block 12 where the vibration amplitude is small, and the proximity sound insulating plate 17 itself is made of a high damping material. , there is no fear of secondary vibration sound generation, and a good noise reduction effect can be obtained.

As is clear from the above description, the proximity sound insulating plate for an automobile engine according to the present invention is made of a damping material and is fixed to the outer surface of the engine by means of a bracket. There is no need to process the mounting seat surface of the mount, so it can be mounted even when the surface shape of the engine is complex, and the mounting work is extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of an automobile engine equipped with a conventional proximity sound insulating plate, FIG. 2 is a sectional view of its main parts, and FIG. 3 is a front view showing an embodiment of the proximity sound insulating plate according to the present invention. , FIG. 4 is an illustrative view, FIG. 5 is an enlarged view of the portion shown in FIG. 3, and FIG. 6 is an enlarged perspective view of the bracket. 11...Engine, 12...Cylinder block, 14...Engine mount bracket, 17
... Proximity sound insulation board, 18 ... Bracket, 19 ...
Rib, 20... Boss portion, 22... Base end portion, 23...
...Tip part, 24...Arm part.

Claims (1)

[Claims] 1. The proximity sound insulating plate is molded from a high damping material, and its outer edge and pressed part are provided with convex portions for contacting the engine surface, while the proximal end of the bracket having spring properties is attached to the engine surface. A close-in sound insulating plate for an automobile engine, wherein the proximal sound insulating plate is fixed to the outer surface of the engine, and the tip part is brought into pressure contact with the pressed part, and the above-mentioned close-in sound insulating plate is press-fixed to the outer surface of the engine by the bracket.