JPS5823947Y2 - Engine surface shielding structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for reducing noise by covering the surface of an internal combustion engine for an automobile with a noise insulating plate.

As a conventional technique for covering the surface of an engine with a shielding plate for the purpose of reducing scratching noise, there is a technique shown in FIG. 1.

That is, the conventional structure is a structure in which steel plates or sand-inch steel plates 2, 2' formed to match the surface shape of the engine block 10 are fixed to the engine block with bolts via elastic supports (for example, in Japanese Utility Model Application No. 51-96146). (see publication).

In conventional structures like this, steel plates or steel plates are used. Lower steel plate 2
, 2' is not only lacking in versatility because it can be designed to match the surface of the cylinder block, but also the vibration input transmitted to the second part of the shielding steel plate is transmitted to the entire steel plate without attenuation, causing the shielding steel plate itself to generate sound. There is a flaw in that it sounds like a body, and since we have taken measures to shield a large area with a single steel plate, it is difficult to install a shielding steel plate in areas with complicated piping and wiring around the cylinder head. It is.

The present invention solves the drawbacks of the prior art as mentioned above.

The shield plate is designed to be versatile so that it can be applied to various types of engines without any design changes, and also to prevent the vibrations transmitted from the internal combustion engine to the shield plate via the support bolts from being transmitted to the entire shield plate. The embodiments shown in FIGS. 2 to 4 will be explained.

The basic structure of the engine surface shielding structure according to the present invention is a grid-shaped frame 4 made of an elastic material such as rubber, and a steel plate 2.
) or a combination of units in which the sound absorbing material 3 is attached to a steel plate in advance.

The lattice spacing and frame width of the lattice-like elastic frame 4 are statistically calculated by measuring the external dimensions of various engines, and by covering slight variations in frame width, the elastic frame 4 can accommodate the corners of the engine. Set accordingly.

The steel plate 2 is fitted into a groove 6 provided in a lattice-like elastic frame 4, and protrusions 5 are integrally provided at the lattice points of the elastic frame 4 to maintain a gap between the frame and the engine block.

The steel plate 2 can be easily removed if necessary when attaching the engine surface shielding structure to the engine, and the protrusion 5 can also be easily cut off. This makes it possible to secure the holes necessary for the insertion of engine accessories.

The elastic frame 4 is provided with a mechanism 6 for attaching the steel plate 2, and the steel plate 2 is supported from all four sides by being fitted into the groove 6.

□The protrusion 5 is formed into a conical or pyramidal shape whose cross-sectional area decreases in the engine direction, so that the surface in contact with the engine surface is reduced.

Figure 3 shows a section of the steel plate in which the engine surface shielding structure configured as described above can be used to shield a wide area of the surface of the fixed structure and reduce the noise level when attached to the engine. A hole 2a is provided in 2, and a bushing 7 is fitted into the hole 2a.

A metal pipe 9 is fitted into the center of the bush 7, and a bolt 8 is passed through the metal pipe 9 and fixed to the engine surface by the bolt 8.

The length of the metal pipe 9 is determined so that the protrusion 5 of the elastic frame 4 just contacts the engine surface.

The mounting locations and number of bolts 8 should be kept to the minimum necessary to prevent the engine surface shielding structure from shifting and to maintain an appropriate clearance between the shielding structure and the engine block surface when attached to the side of the engine block, etc. is preferable.

Further, the sound insulation performance is further improved if a uni-laminated shielding plate is provided with a sound absorbing material 3 attached to the inside of the steel plate 2 fitted to the elastic frame 4 as shown in FIG. 2C or FIG. 3.

The selection of the shielding plate is free. Figure 4 shows an embodiment of the engine surface shielding structure according to the present invention installed on an engine. You can also wrap it freely.

As described above, according to the present invention, by removing a portion of the steel plate or cutting out a portion of the elastic frame, it is possible to easily avoid the engine manifold and other auxiliary equipment, which are the main sources of noise, such as the skirt section and rocker. It is possible to cover the engine up to the cover, etc., and since the lattice-like elastic frame is flexible, it can flexibly follow twists or slight irregularities on the engine block surface, so it can be freely applied to Arayuru type engines as is. It is.

In addition, even if the vibration input from the engine surface to the bolt is transmitted to the steel plate in the section, it is not directly transmitted to other nearby steel plates due to the lattice-like rubber frame, and the shield plate itself becomes a sounding body. In addition, there is some flexibility in selecting the type and thickness of the shielding plate for each section of the lattice-like elastic frame, allowing for flexible countermeasures depending on the level of noise on the engine surface. , which has many advantages.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional engine surface shielding structure, and FIGS. 2 to 4 show embodiments of the present invention. Figures 2A and 2C are partial perspective views of the lattice-like elastic frame. FIG. 3A is a perspective view and a sectional view showing an example of the mounting structure of the engine surface shielding structure, and FIG. 4 is a perspective view of the engine surface shielding structure. It is a perspective view showing a state. 1...Engine block, 2...m plate, 3...Sound absorbing material, 4...Elastic frame, 5
...protrusion, 6...groove. 7... Bush 8... Bolt, 9.
...Metal Eve.

Claims (1)

[Scope of utility model registration request] In a noise shielding plate arranged with a clearance on the surface of an automobile internal combustion engine, the shielding plate is divided into a lattice shape, and each divided shielding plate is connected to a groove provided in a lattice-shaped elastic frame. An engine surface shielding structure characterized by being configured by being detachably attached to each.