JPS581069Y2 - Engine soundproof structure - Google Patents

Description

[Detailed description of the invention] This invention is designed to transmit information to the outside through a gap between a rotating body such as a pulley attached to the engine and the engine body adjacent to it, or a member attached to this and a wall surface adjacent to it. The present invention relates to a soundproof structure that reduces amplified noise.

Generally, various accessory devices and parts are often disposed close to the engine.

However, if there is a gap between this device or part and the wall of the engine body, noise may be transmitted to the outside through this gap, or the specific frequency may be amplified by this gap, resulting in loud noise. This increases the noise of the engine as a whole.

The same applies to the gap between the rotating body and the wall surface of the body to which it is attached, such as between the crank pulley and the engine body, or between the water pump pulley and the pump body.

For example, with regard to the gap between the crank pulley and the engine body, the vibration noise of the gear case cover, which is generally located at the front, the meshing sound of the timing gear, and other sounds transmitted along the crankshaft, are caused by the rear surface of the pulley and the vicinity. The noise of the entire engine is increased by standing waves that are transmitted to the outside through the gap between the gear case cover and the wall surface of the gear case cover, or are induced by this gap.

In view of the above points, the present invention aims to suppress the noise transmitted to the outside through the gap between the rotating body and the adjacent engine body or the wall surface of the member attached thereto, as well as the noise induced by this gap. It is.

The present invention will be explained below with reference to an embodiment shown in the drawings.

1 is the crank pulley, 2 is the torsional damper 13
4 is a cushioning material, and 4 is a timing gear case cover bar.

A pulley 1 as a rotating body equipped with a damper 2 is attached to the front part of the crankshaft 5, and then a gear case cover 4 as a member attached to the engine body covers timing gears 6 and 7 driven by the shaft 5. Cylinder body 8 as the engine body
installed on.

Then, between the pulley 1 and damper 2 and the gear case cover 4, apply adhesive or the like to the wall surface 4A of the gear case cover, which is close to the rotating body, within a range that does not interfere with the rotation of the rotating body. An attached cushioning material 3 having a soundproofing effect, such as rubber, is disposed in close proximity to the rear surface IA of the pulley and the rear surface 2A of the damper.

According to one embodiment of the present invention configured as described above, the noise caused by the meshing of the timing gears 6 and 7, or the noise generated inside the engine and transmitted along the crankshaft 5, is transmitted to the pulley 1 and the damper 2, which are rotating bodies. Since the buffer material 3 is placed very close to the rear surfaces IA and 2A of the pulley and damper so as to fill the gap with the wall surface 4A of the gear case cover, which is a wall surface adjacent to this, there is no possibility of leakage to the outside from this gap. Furthermore, the generation of standing waves induced in this gap is also suppressed.

As described above, according to the present invention, since the noise emitted to the outside through the gap and the standing waves induced in the gap are simultaneously suppressed, a large noise reduction effect can be obtained as an engine.

In this embodiment, the gear case cover 4 is provided with a cushioning material 3.
Although it is assumed to be attached to pulley 1 and damper 2, it is also possible to attach it to both pulley 1 and damper 2.
In short, it is sufficient to minimize the gap between the wall surface of the engine body or a member attached thereto and the rotating body adjacent thereto.

Although the present invention has been described with reference to the gap between the crank pulley 1, the damper 2, and the gear case cover 4, the present invention is not limited to this. It is applied.

[Brief explanation of the drawing]

The figure is an enlarged view of essential parts showing an embodiment of the present invention. 1...Crank pulley, 2...Torsional damper 3...Buffer material, 4...
Tie □ Case cover 5... Crankshaft.

Claims (1)

[Scope of utility model registration request] In an engine having a rotating body such as a pulley, a buffer material is attached to at least one of the wall surface of the engine body or a member attached to the engine body adjacent to the rotating body and the rotating body, and the buffer material is placed extremely close to the other. A soundproof structure for an engine characterized by being arranged in.