JPS58162729A - Noncontact sound insulation plate for automobile engine - Google Patents

Abstract

PURPOSE:To reduce noise effectively with a simple mounting of a noncontact sound insulation plate regardless of the shape of the surface of an engine by providing the plate made of a high damping material while it is pressed securely on the outer surface of the engine with a bracket. CONSTITUTION:A noncontact sound insulation plate 17 is made of a high damping material while a convex section 20 is provided on an outer rim 17a and a pressed section 17b so as to contact the surface of an engine 11. The base end of a bracket 14 with a spring property is fixed on the engine 11 with a bolt 15. A noncontact sound insulation plate 17 is pressed securely on the outer surface of the engine with the bracket 14 having the tip 23 thereof pressed against the pressed section 17b. Thus, the noncontact sound insulation plate 17 can be mounted simply and accurately regardless of the shape of the engine surface along with a better noise reduction effect.

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 radiation density.

Generally, in order to reduce the noise emitted from the outer surface of an automobile engine, as shown in Figure 1,
For example, on the side surface of the cylinder block 1 of the engine, a proximal sound insulating plate 2 made of a pressed copper plate or the like is separated by 11L, and the peripheral edge 3 of this proximate sound insulating plate 2 is bent inward 111 to minimize noise leakage. In addition, this proximity sound insulation @2 itself is elastically supported by the cylinder block 1 so that it does not become a secondary sound source due to the propagation of the vibration from the cylinder block 1. That is, as shown in Fig. 2, a cylindrical rubber mount 6 with metal screws s4.5 at both ends...
At several appropriate locations on the 1IA tone plate 2, the threaded portion 4 at one end is screwed into the cylinder block l, and the threaded portion 5 at the other end of the rubber mount 6 is connected to the nearby m1ll tone plate 2t-nut 7.
It has a structure that stops it.

However, in such conventional collection, when the surface shape of the engine is complex, it is difficult to secure the mounting surface of the rubber mount 6 at a suitable position, that is, at a position /J% below the vibration input. However, there was a drawback in that when fastening the near IjIII tone plate 2t with the nut 7, the screw portion 5 had to be inserted into the through hole 8 of the near IjIII tone plate 20 one by one, making the installation work extremely troublesome.

The present invention has been made in view of these conventional problems, and provides a close-in 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. The purpose is to

That is, the proximity sound insulation board for an automobile engine according to the present invention is formed by molding the proximity sound insulation board from a high damping material, and at the same time, the outer edge portion and the suppressed portion are provided with a convex portion for closely contacting the surface of the U engine, and the other side is The proximal end of the bracket, which has a spring property, is fixed to a part of the engine, and the distal end is brought into pressure contact with the suppressed part, and the bracket suppresses the nearby sound plate on the outer surface of the engine. It is fixed.

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

3 and 4, reference numeral 12 indicates a cylinder block of the engine 11, reference numeral 13 indicates an oil pan, and reference numeral 14 indicates an engine mount bracket whose one end is fixed to the cylinder block 12 with pins 15 and 16. Further, 17 is a proximal Ill plate attached to the cylinder block 1zllIIDK, 18h is a bracket for pressing and fixing this proximal sound insulating plate 17, and the sound plate 17 is made of a high damping material with excellent vibration damping characteristics. The cylinder block 12 is formed into a predetermined shape according to the outer shape of the cylinder block 12. At its outer edge @17a, a lip 19 is formed, and a ridge pressing portion 17klKij boss m which is pressed by the above-mentioned bragglet 18 is formed as a convex portion to protrude toward the cylinder block 12, thereby protruding toward the cylinder block 12. [21] is held between the tone plate 17 and the outer surface of the cylinder block 12 for a predetermined period. In addition, the above-mentioned high damping material includes, for example, non-woven materials such as wool, nylon, Tetron, or acrylic organic or glass fibers, mixed with a resin such as acrylic resin, phenolic resin, and a formalin-based crosslinking agent (binder). Examples include those molded under heat and pressure, rubber such as NBR, and synthetic resins such as polyurethane foam, polyethylene, and polystyrene. Further, as shown in detail in FIG. 6, the bracket 18 has a disc-shaped base end n and a distal end. 23 are connected by a band-shaped arm portion 24 having a spring property of 1,
Its base end η is tied to the bolt 15 of the engine mount bracket 14, and its tip portion 23 having a claw portion Z3a abuts against the pressed portion 17b of the near IIk tracer plate 17. , which is compressed and fixed to the cylinder block 12. Figure WJ5 is an enlarged view of the suppressed part 17t), which has a boss s20, a relatively shallow large diameter recess, and a relatively deep small diameter recess in the center. X is recessed in two stages, and the front end of the placket fits into the recess δ, and its claw Z31L further engages with the recess 26.

That is, the tip part n presses against the adjacent sound insulating plate 17 with its relatively wide inner pole to prevent excessive internal pressure from being applied, and the claw part 23+! The engagement of L and the four parts prevents the proximal sound insulating plate 17 from moving and allows it to be securely fixed at a predetermined position.

Therefore, the above aM is caused by
Since there is no need to process the seat surface, it can be easily installed, and by combining the bracket 18 with the engine mount bracket 14, a completely new process can be applied to 12% of the engine's cylinder block. There is no need to add In addition, the cylinder block 1 becomes the vibration propagation path from the cylinder block 12.
2, it can be set arbitrarily to the area where the vibration loss width is small, and since the proximal end sound plate 17 itself is made of a high damping material, there is no fear of secondary vibration sound generation, and the noise is suppressed well. This results in a reduction effect.

As is clear from the above description, 1. 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 using a bracket, so it is not necessary to use a rubber mount as in the conventional case. It is not necessary to process the mounting seat surface, so it can be mounted even when the surface shape of the engine is complicated, and the mounting work is extremely simple.
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[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 an example of a water-containing near & omnidirectional sound board according to the present invention. front view,
Figure 4 is a side view of the same, Figure 5 is an enlarged view of a portion of Figure 93, and Figure 6 is an enlarged perspective view of the bracket. 11...Engine y, '12...Cylinder block,
14...Engine mount bracket, 17...
Kinmei Zuonban, 18...Bracket, 19...Reply,
Add...Boss part, η...Base end, O...Tip part, Sae...Arm part.

Claims (1)

[Claims] (1) The proximity sound insulating plate is molded from a high damping material, and its outer edge and suppressed part are provided with protrusions for contacting the engine surface, and the proximal end of the bracket with spring properties is attached to the engine surface. A close-in sound insulating board for an automobile engine, which is fixed to a part of the above-mentioned near-board sound insulating plate, and has a tip end pressed against the suppressed part, and is fixed to the outer surface of the close-in sound board assembly by means of the bracket.