DE2909077A1 - IC engine with noise attenuating cladding - has manifolds supported from cylinder head via layers of dampening material - Google Patents

Abstract

The internal-combustion engine with noise-attenuating cladding has the manifolds e.g. for intake air (6), water outlet etc, supported from the cylinder head (1) via intermediate layers (7, 8) of noise-dampening material. Supporting bodies (4) with apertures can be screwed to the head at the manifold openings, (2), the manifolds being fitted to them via annular intermediate layers also acting as joints. Openings can be formed in the manifolds in line with the screws (5), and closed by plastic caps (11).

Description

Applicant:
Steyr-Daimler-Puch AG

Kärntnerring 7 A-10-10 Vienna

Representative:

Kohler-Schwindling-Späth Patent attorneys

Hohentwielstrasse 41 7000 Stuttgart 1

Stuttgart, 7-3.1979 P 3693 Hp

Internal combustion engine with sound-absorbing casing

Q30037 / 039S

Internal combustion engine with sound-absorbing casing

The invention "relates to an internal combustion engine with sound-absorbing casing.

So far are used to prevent the radiated Noise from internal combustion engines, so-called sound capsules are used, i.e. the entire internal combustion engine is used if possible boarded up, disadvantageous is the bad one Accessibility to the individual parts of the internal combustion engine and thus also the increased technical Aufxtfand for repairs or maintenance. Will the capsule through If oil is contaminated, the sound-absorbing lining is damaged and there is even a risk of fire. In addition, such casings inhibit the dissipation of heat.

Manifolds, such as the intake air line, cooling water drainage and the like, have so far been rigid with the cylinder head and connected to body-sound-conducting, although they are a relatively have a large surface and thus emit part of the structure-borne noise.

The invention is based on the object of creating an internal combustion engine in which the structure-borne sound is emitted is reduced, without a separate cladding that hinders accessibility for the collecting lines to have to provide.

The invention solves the problem posed by that the collecting lines, such as intake air line, cooling water drainage or the like., Via structure-borne sound-insulating intermediate layers are supported on the cylinder head.

The transmission of structure-borne noise from the cylinder head to the manifolds is through the insulating intermediate layers prevented so that the manifolds on the one hand

030037 / 039S

part of the otherwise radiating cylinder head wall cover, but on the other hand are themselves isolated and therefore do not emit any structure-borne noise. The manifolds be designed as before with unencapsulated internal combustion engines, so that they have access to the internal combustion engine do not hinder.

In order to achieve a perfect attachment of the collecting line to the cylinder head, perforated support bodies are screwed to the cylinder head in the area of the channel openings for guiding the medium, on which the collecting line is placed via ring-shaped intermediate layers that also serve as a seal. This also simple production possibilities arise for both versions of the annular spacers as well as these themselves, the perforations may be formed streamlined.

The end faces of the support bodies are covered by the wall of the collecting line, this wall being made of plastic caps or the like. closed openings in the area of the Has fastening screws. The support body area is also shielded from the outside against sound radiation. Nevertheless, the screws can be operated through the openings in the wall of the manifold » so that it is possible, the collecting line .samt the support bodies can be removed or re-attached without additional work steps compared to conventional assembly require.

In a further embodiment of the invention, the support bodies are of the same size on both sides of the openings annular intermediate layers arranged coaxially. This symmetrical structure ensures that none of the Reaction forces caused by the pressure of the medium occur which detach the manifold from the cylinder head could cause.

030037/0395

The ring-shaped intermediate layers are glued or vulcanized into their mounts to ensure tightness without pre-tensioning the intermediate layers and thereby in their ability to insulate against structure-borne sound transmission having to affect.

The manifold is for direct connection Formed from noise-reducing shuttering parts in order to prevent structure-borne sound radiation from neighboring zones. The adjacent formwork parts can also be a different collecting line, for example the Act cooling water discharge. It would also be possible to have two collecting lines, namely for the intake air on the one hand and for the cooling water, on the other hand, to unite in one piece.

In the drawing, the subject matter of the invention is shown in one embodiment, namely show lig.1 the cylinder head of an internal combustion engine with the Intake air line in partial section,

Fig. 2 is a section along the line H-II of Fig.i and 3fig.3 shows a section along the line IH-III of FIG.3.

On the cylinder head 1 of an internal combustion engine, 3 support bodies are in the area of the openings 2 of the air inlet ducts screwed on with the help of two screws 5 each Supporting bodies 4 is the intake air line 6 via, at the same time, serving as a seal, annular, body sound-insulating ends Intermediate layers 7 »8 put on. From 3? Ig.1 it can be seen that that the support body 4 for guiding the air to the duct inlet openings 2 are broken. The two arranged on both sides of the openings 9, ring-shaped Intermediate layers 7 »8 are roughly the same size and arranged coaxially, so that the internal forces cancel each other out. The support body 4 is frontally through the wall 10 of the Covered intake air line 6, this wall having openings 12 closed by plastic cover 11, in order to be able to operate the fastening screws 5. In fig. 2 is the connection of sound-insulating capsules for other parts of the internal combustion engine to the intake air line 6 indicated by dash-dotted lines.

030037/0395

Claims (6)

Claims 1. Internal combustion engine with sound-absorbing casing, ^ characterized in that the manifolds, such as Air intake line (6), cooling water discharge or the like,
over structure-borne sound-insulating intermediate layers (7 »8) am
Cylinder head (1) are supported. 2. Internal combustion engine according to claim 1, characterized in that the cylinder head (1) in the region of the channel openings (2) for mitigation of the medium is perforated
Support bodies (4) are screwed onto which the collecting line (6) is placed via annular intermediate layers (7 »8) which also serve as a seal. 3. Internal combustion engine according to claim 2, characterized in that the support body (4) on the end face, through the
Wall (10) of the manifold (6) are covered, with
this wall with plastic caps or the like. (11) closed openings (12) in the area of the fastening screws (5)
having. 4. Internal combustion engine according to claim 2, characterized in that on both sides of the openings (9) of the
Support body (4) ring-shaped intermediate layers of the same size
(7 »8) are arranged coaxially. 5- internal combustion engine according to claim 2, characterized in that the annular intermediate layers (7, 8) are glued or vulcanized into their mounts.
6. Internal combustion engine according to one of claims 1 to 5 »characterized in that the collecting line (6) for the direct connection of sound-absorbing formwork parts is formed. 037 / 039S