DE10360770A1 - muffler mounting - Google Patents

Abstract

A silencer (1) is rigidly fastened to the compressor housing (2) in a first connection region (12, 22) by means of a fastening element (3). In a second connection region (13, 23), the silencer rests with a bearing surface on a bearing surface on the compressor housing, wherein the silencer is biased by the support in the second connection region with respect to the rigid attachment in the first connection region. DOLLAR A The bias voltage raises the natural frequency of the silencer, which can prevent inadmissible vibration peaks of the silencer.

Description

technical area

The The invention relates to the field of exhaust gas turbochargers.

she relates to the attachment of a muffler to a compressor housing, according to the preamble of claim 1.

Exhaust gas turbochargers for supercharging internal combustion engines have in most cases at the compressor inlet on a filter silencer. These mufflers with attached filter are preferably rigidly connected by means of a mounting flange with the compressor housing. Such a connection is for example from the EP 1 186 781 A1 . 1 seen.

Of the Turbocharger is either directly or by means of a special Foot attached to the engine console. In most cases it is the axial distance between foot and muffler is very large. By engine vibrations can the muffler too inadmissible great vibrations are excited. This especially if the natural frequency of the muffler only insignificant over that of the turbocharger mounts. In this case occur at silencer unacceptable Vibration peaks on.

Short illustration the invention

Of the Invention is therefore the object of the attachment of the muffler on the compressor housing Take measures to prevent improper Vibration peaks of the silencer to prevent.

According to the invention this object with a fastening with the features of claim 1 solved.

Of the silencer is rigid in a first connection region by means of a fastening element on the compressor housing attached. In a second connection area of the muffler is located with a bearing surface on a support surface on the compressor housing on, with the muffler through the support in the second connection area opposite the rigid attachment in the first connection area with a bias is charged.

By the bias voltage is the natural frequency of the muffler massive raised.

Further Advantages result from the dependent claims.

Short description the drawings

in the The following are based on the figures, several embodiments of the inventive attachment shown schematically and closer explained. In all figures, the same effect elements with the same reference numerals Mistake. Show it:

1 a section through the muffler and the compressor housing of an exhaust gas turbocharger, which are interconnected according to the invention by means of fastening and support flange, and

2a) -K) enlarged views of the support flange 1 in different embodiments.

Way to execute the invention

1 shows a section through the air inlet side of an exhaust gas turbocharger with the compressor housing 2 and the muffler located at the air inlet of the compressor 1 , Not shown is the rotatable about an axis mounted compressor wheel and the entire turbine side of the exhaust gas turbocharger.

The muffler comprises a base body, the plurality of radially arranged sound insulation panels 11 wearing. The air to be compressed is according to the arrows in the radial direction via a filter arranged on the circumference of the muffler 15 and fed between the sound insulating panels through the air inlet of the compressor.

The silencer is by means of several distributed along the circumference screws 3 or other suitable fastener attached to the compressor housing. The screws fix the muffler in both the axial and radial directions with respect to the compressor housing.

For attachment by means of the screws, the silencer in the radially outer region of the compressor housing facing housing wall 14 a mounting flange 12 on. The compressor housing also has a corresponding mounting flange in the radially outer region 22 on.

In the radially inner region of said housing wall of the muffler is a support flange 13 arranged. About this support flange of the muffler on a corresponding support flange 23 axially supported on the compressor housing.

According to the invention, the support flange 13 of the muffler opposite the mounting flange 12 axially biased. When mounting the muffler on the compressor housing in the axial direction, it comes first in the area of the support flanges 13 and 23 to a contact between the muffler and the compressor housing. In the contact area of the mounting flanges 12 and 22 There is a gap in the axial direction, which only by the subsequent tightening of the screws 3 is closed. By closing the gap, the housing of the muffler between mounting and support flange according to the invention slightly warped and thereby applied to the muffler with the axial bias.

The support under bias has an influence on the natural frequency of the muffler. Corresponding a cantilevered cantilever whose natural frequency is elevated, if he is in addition supported will be raised the natural frequency of the present invention attached to the compressor housing Silencer. The natural frequency of the muffler can face this way conventional attached silencers be raised by 30 to 60%.

Moreover Prevents axial preload chafing of the muffler the compressor housing.

2a) to k) shows a selection of possible embodiments of the in 1 Dashed circled contact area between the support flange on the muffler 13 and the support flange on the compressor housing 23 ,

Compared to the in a plane perpendicular to the axis arranged bearing surfaces according to a) have the conically shaped bearing surfaces shown in b) and c) Advantage that they are in the assembly of the muffler the Centering of the muffler with respect to compressor housing facilitate. All of the first three embodiments are distinguished In addition, by a very simple manufacturability.

The embodiments d) to i) have a good sealing effect and a good joint damping. They are all different radially stepped embodiments with different consuming to produce Support surfaces.

Around to obtain even further improved sealing and damping property may instead of a step or groove / comb connection as shown in k) in corresponding grooves or half-round grooves an O-damping ring axially compressed from elastomer or other suitable material become.

To to the first, simplest embodiment have with the arranged perpendicular to the axis bearing surfaces all illustrated embodiments a positive connection in the radial direction, which is an additional Stabilization of silencers and compressor housing entails.

1

silencer

11

acoustic tiles

12

mounting flange

13

support flange with contact surface

14

Muffler housing wall

15

filter

2

compressor housing

22

mounting flange

23

support flange with contact surface

3

Fastener, screw

4

damping ring

Claims (6)

Mounting a silencer ( 1 ) on the compressor housing ( 2 ) of an exhaust gas turbocharger, wherein the silencer in a first connection region ( 12 . 22 ) by means of a fastening element ( 3 ) is rigidly attached to the compressor housing, characterized in that the muffler in a second connection region ( 13 . 23 ) rests with a bearing surface on a bearing surface on the compressor housing, and that the muffler is biased by the support in the second connection region relative to the rigid attachment in the first connection region. Fastening according to claim 1, characterized in that the muffler in the first connection region a mounting flange ( 12 ), with which the muffler by means of the fastening element ( 3 ) on the compressor housing ( 2 . 22 ), and in that the muffler in the second connection region has a supporting flange ( 13 ), with which the muffler on the compressor housing ( 2 . 23 ) is supported, and that the support flange against the mounting flange is subjected to an axial bias. Attachment according to one of claims 1 or 2, characterized that the muffler and the compressor housing have conical bearing surfaces in the second connection area. Attachment according to one of claims 1 to 3, characterized that the muffler and the compressor housing have radially stepped bearing surfaces in the second connection region. Attachment according to claim 4, characterized that the muffler and the compressor housing have in the second connection area interlocking groove / comb support surfaces. Attachment according to claim 4, characterized in that in the case of silencers and compressor housings, grooves are embedded in the bearing surfaces in the second connection region, and in that a damping ring ( 4 ) is arranged in the grooves.