WO2019185189A1

WO2019185189A1 - Centrifugal compressor housing of an exhaust gas turbocharger and method for producing a centrifugal compressor housing of this type

Info

Publication number: WO2019185189A1
Application number: PCT/EP2019/000065
Authority: WO
Inventors: Dario LAMPERTI; Tomokaza MURAYAMA
Original assignee: Ihi Charging Systems International Spa; Ihi Corporation
Priority date: 2018-03-29
Filing date: 2019-03-05
Publication date: 2019-10-03
Also published as: DE102018107581A1

Abstract

The invention relates to a centrifugal compressor housing (2) of an exhaust gas turbocharger and to a method for producing a centrifugal compressor housing (2) of this type. The centrifugal compressor housing (2) of a turbocharger is designed in once piece, comprising a connector (4; 8) that has an outer surface (27; 30), an anti-rotation tooth (42; 44) that projects outwards from the outer surface (27; 30), and an insertion aid (22; 24) that extends around the central axis (14; 16) of the connector (4; 8) at an end region (26; 28) thereof and tapers at least in regions towards the end (32; 33) of the connector (4; 8) facing away from the centrifugal compressor housing (2). According to the invention, the insertion aid (22; 24) comprises a region (34) which projects radially outwards from the outer surface (27; 30).

Description

Radial compressor housing of an exhaust gas turbocharger and method for producing such a radial compressor housing

The invention relates to a radial compressor housing of an exhaust gas turbocharger in the

The preamble of claim 1 specified type. Furthermore, the invention according to claim 9 relates to a method for producing such a radial compressor housing.

In DE 10 2008 027 204 A1, the state of the art recognizes a radial compressor housing of an exhaust-gas turbocharger, which is integral with

a connecting piece, which has a lateral surface,

an anti-rotation tooth, which protrudes outwardly from the lateral surface and

a Aufsteckhilfe, which rotates at an end region of the connecting piece with respect to a central axis of the lateral surface and which tapers in regions towards the Aufsteckende of the connecting piece.

To attach a coupling element this is pushed over the Aufsteckhilfe on the connecting piece. The coupling element has a radially outward

Spring element, which engages in the installed state with the connecting piece in a radially circumferential groove of the connecting piece. By this engagement of the spring element in the groove thus an axial displacement of the coupling element with respect to the connecting piece is avoided. The connecting piece has an anti-rotation tooth arranged radially on the outside of the groove, as a result of which a rotation of the coupling element with respect to the connecting piece is reliably avoided. This arrangement corresponds to a fixed bearing, which does not allow relative movements.

From DE 10 2016 223 355 A1 another radial compressor housing is a

Exhaust gas turbocharger known. The centrifugal compressor housing is in one piece with

a connecting piece, which has a lateral surface and

three identically dimensioned locking projections, which are arranged in uniform pitch or alternatively in non-uniform pitch along a closed circumferential line on the outside of the connecting piece. The locking projections project radially outwardly from the lateral surface with respect to their central axis. The locking projections are in

Locking recesses of a hollow cylindrical part received, the one

Aufsteckhilfe has, which rotates at an end portion of the hollow cylindrical part. On the hollow cylindrical part, an end portion of a gas guide pipe is attached.

Furthermore, radial compressor housings are known in which instead of a

Verdrehsicherungszahnes or a locking projection a pin as

Anti-rotation is provided for a hose-like gas guide pipe. The pin is inserted into a bore of the connecting piece and perpendicular to the

Central axis aligned. Such a separate pen is expensive.

The object of the invention is to provide a radial compressor housing, which in

cost-effective manner can be connected to a gas guide pipe. It is another object of the invention to show a pertinent manufacturing method.

This object is achieved by a centrifugal compressor housing with the features of

Patent claim 1 solved. Furthermore, the object is achieved by a method for producing such a radial compressor housing with the features of claim 9. Advantageous embodiments with appropriate and non-trivial

Further developments of the invention are specified in the remaining claims.

An inventive radial compressor housing of an exhaust gas turbocharger is integral with a connecting piece, which has a lateral surface,

- An anti-rotation tooth projecting from the lateral surface to the outside and

a Aufsteckhilfe, which rotates at an end region of the connecting piece about the central axis and which tapers in the direction of the direction away from the radial compressor housing end of the connecting piece at least partially.

Characterized in that the Aufsteckhilfe has an area, starting from the

Projecting lateral surface radially outward, the gas guide pipe can be fixed axially on the connecting piece, without it being another

Component such as a sleeve needs. The anti-rotation tooth sets the Gas guide pipe in the circumferential direction fixed, so that the same can not be mounted twisted and remains fixed during ferry operation.

In a particularly assembly-friendly embodiment, it is provided that the connecting piece and the lateral surface are arranged coaxially to the central axis and that the anti-rotation tooth, starting from a Anlageflanschfläche a Anlageflansches for a gas guide pipe in the direction of the Aufsteckhilfe extends parallel to the central axis. In order to be able to inexpensively manufacture such an abutment flange surface, in particular with a shell end mill, provision can be made for the abutment flange surface to lie in a plane perpendicular to the central axis.

Further manufacturing advantages can be achieved by providing that the anti-rotation tooth has a tooth head surface which extends at a constant radial distance from the central axis over the entire length of the anti-rotation tooth in the direction of the abutment flange and merges into the outer surface thereof without offset. Namely, this outer surface and the Zahnkopffläche can be made both with the roll surface of the Shell end mill in a single operation or the outer surface and the Zahnkopffläche are already in the prototyping of

Radial compressor housing manufactured and not machined. On a machining of these two surfaces can be omitted in particular if they do not come to rest on the gas guide pipe, so that the surfaces do not form functional surfaces and coarse Gusstoleranzen are sufficiently accurate.

A production by means of a milling cutter or Walzenfrirners can be done inexpensively in one operation, if it is provided that the anti-rotation tooth from its Zahnkopffläche starting in both circumferential directions on machined concave surfaces in a likewise machined further surface of the lateral surface and that both the concave surfaces as well as the further surface the Anlageflanschfläche connected via a tool conditionally consistent radius.

In order to ensure a secure hold of the gas guide pipe at the connection piece, in spite of the relatively simple and cost-effective connection technology, for example, compared to DE 10 2008 027 204 A1 and DE 10, it can be provided that that the surface of the lateral surface between the anti-rotation tooth and the plug-on aid has a plurality of successive grooves, with which the maintenance of a plugged on the connecting piece gas guide pipe is improved. For additional security, the gas guide pipe may also have grooves on the inside thereof, which correspond to the grooves on the connecting piece, so that the

Wave troughs of the grooves of the gas guide pipe in the crests of the grooves of the connecting piece engage positively. This positive connection can be further improved by the gas guide tube is pressed by means of a clamp against the connecting piece, which is placed on the gas guide pipe and tensioned.

The Aufsteckhilfe can be positively connected to the gas guide pipe by the Radialverdichtergehäuse is provided that the Aufsteckhilfe tapers from an area with their maximum outer diameter in directions on the abutment flange. In this case, the gas-guiding pipeline can have a corresponding annular groove on the inner side of the tube, into which the plug-in aid engages.

Since the production of the grooves causes costs, can be at a cost

Radial compressor housing on the inlet side to be dispensed with grooves, since on the inlet side, the loads are less by the fresh gas flow than on the

Outlet. Accordingly, it can be provided that the connecting piece is a first connection piece, which is associated with the outlet side of the fresh gas stream, which is assigned to the inlet side, a further connecting piece, which is another

Investment flange and another Aufsteckhilfe has, wherein the surface of the lateral surface between the other Anlageflanschfläche and the other Aufsteckhilfe is substantially smooth.

According to claim 9, the invention relates to a cost effective method for

Production of a radial compressor housing. It is envisaged that a rotating shell end mill with an outer diameter which is greater than

Shank diameter, with constant radial distance to the central axis of the

Connecting stub is guided around the connecting piece, so that at the same time a Anlageflanschfläche to create a gas guide pipe and a lateral surface of the connecting piece are machined, and that a narrow To connect the area of the lateral surface two concave surfaces, also from the

Shell end mills are machined and form the lateral surfaces of the anti-rotation tooth.

A further shortening of the processing time can be achieved by providing that the shell end mill in a first method step for producing the first concave surface of the anti-rotation tooth in the direction of the

Connecting neck is guided and that the shell end mill is guided around the central axis in a second process step for producing the abutment flange and that the shell end mill is guided in a direction away from the connecting flange in a third method step for producing the second concave surface of the anti-rotation tooth.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features mentioned above in the description and

Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention. Identical or functionally identical elements are assigned identical reference numerals. For reasons of clarity, it is possible that the elements are not provided with reference numbers in all figures, but without losing their assignment. Showing:

1 is a perspective view of an inventive radial compressor housing with two connecting pieces,

Fig. 2 in a perspective view of a gas guide pipe, suitable for mounting on a connecting piece of the centrifugal compressor housing like. Fig. 1,

Fig. 3 in a half-section along a central axis a connecting piece of the centrifugal compressor housing like. Fig. 1 with a same processing

Shell end mills, Fig. 4 in a perspective view of the connecting piece and the

Shell end mills like. 3, with adjusted travel of the shell end mill,

Fig. 5 like in a detail view of the connecting piece. Fig. 1, Fig. 3 and Fig. 4, and

Fig. 6 is a plan view of an alternative embodiment of the gas guide duct.

Fig. 1 shows a perspective view of a radial compressor housing 2, within which a not-shown compressor wheel of an exhaust gas turbocharger is rotatably arranged. The turbocharger is for a example as

Hubkolbenmaschine trained internal combustion engine provided and includes in a conventional manner a turbine with a turbine wheel, which via a shaft with the

Compressor is connected such that the compressor rotates at the speed of the turbine wheel, the blades are arranged in the exhaust stream of the engine. Thus, a fresh gas can be compressed by the compressor wheel.

The centrifugal compressor housing 2 comprises a first connecting piece 4, which extends tangentially starting from a spiral housing part 6 from the same.

In addition, the radial compressor housing 2 comprises a further connecting piece 8, which opens centrally into the spiral housing part 6 and which is associated with an inlet side 10 of the radial compressor housing 2. From the inlet side 10, the fresh gas of a fresh gas flow is guided via a spiral channel within the spiral housing part 6 to the first connection port 4, which is thus associated with an outlet side 12. The two connecting pieces 4, 8 are arranged coaxially with each of a central axis 14 and 16 respectively. The following statements "axial" and "radial" refer to the respective associated central axis 14 and 16, respectively.

To the fresh gas from an air filter, not shown, to the other

To lead connecting piece 8 or from the first connecting piece 4 for

To lead mixture preparation of the internal combustion engine, each one shown in FIG. 2, substantially tubular gas guide pipe 18 is provided which has a connecting piece 20 which is pushed onto the respective connecting piece 4 and 8 respectively. The gas guide pipe 18 is clamped by a clamp radially against the connecting piece 4 and 8 and has on the inside a recess 19 for receiving a Verdrehsicherungszahns 42 and 44, which is apparent from Fig. 1.

To facilitate the sliding of the gas guide pipe 18, that is

Radial compressor housing 2 of the exhaust gas turbocharger in one piece with two Aufsteckhilfen 22, 24, which are arranged at the end portions 26, 28 of the connecting piece 4, 8,

educated.

In the following, the two connecting pieces 4, 8 are explained, which are in

Essentially differ only in that the first or outlet side

Connecting piece 4 a lateral surface 27 with several consecutive

arranged grooves 29, with which the stop of the plugged on the connecting piece 4 gas guide pipe 18 is improved, whereas the further or inlet-side connecting piece 8 is smooth on a corresponding lateral surface 30 which rotates about the central axis 14 of the associated connecting piece 8.

As can be seen from FIG. 1 and FIG. 3, the assembly or attaching of the gas guide pipe 18 to the connecting stub 4 or 8 is facilitated by the plug-in aid 22 or 24 being directed towards the end 32 and 33, respectively

Connecting stub 4 or 8 partially tapered so that the elastic

deformable gas guide pipe 18 and the connecting piece 20 can expand over this conical region. In order to improve the grip of the gas guide pipe 18 on the connecting piece 4 and 8, it is provided that the plug-in aid 22 or 24 has a region 34 (FIG. 3) which protrudes radially outward from the lateral surface 27 or 30 and which engages in a non-illustrated corresponding inner ring groove on the inside of the gas guide pipe 18.

The Aufsteckhilfe 22 and 24 tapers, starting from the area 34 maximum

Outside diameter D2 (Fig. 3) in both axial directions. Consequently, the plug-in aid 22 or 24 tapers from the region 34 also in the direction of the

Spiralgehäuseteil 6 or on a Anlageflanschfläche 36 or 37, wherein in particular the Anlageflanschfläche 36 of FIG. 3 can be seen and which lies in a plane perpendicular to the central axis 16 and 14 and a abutment flange 38 and 40 of the

Radial compressor housing 2 is associated. Starting from the abutment flange surface 36 for the gas guide pipe 18, the anti-rotation tooth 42 or 44 extends in the direction of the end 32 or 33 parallel to the central axis 14 and 16, respectively.

The respective anti-rotation tooth 42 and 44 is in one piece with the

Radial compressor housing 2 and projects from a portion of an annular circumferential narrow surface 60 and 62 outward, which is part of the lateral surface 30 and 27 respectively. In this case, the annular circumferential surface 60 and 62 is in lateral

Surface of the anti-rotation tooth 42 and 44, which are formed by concave surfaces 56 and 58, which are machined and in detail from Fig. 5 can be seen.

The concave surfaces 56 and 58 lead to a Zahnkopffläche 45 and 46, which extends at a constant radial distance from the central axis 14 and 16 over the entire length of the anti-rotation tooth 42 and 44 in the direction of the abutment flange 38 and 40 and without sales the outer surface 48 and 50 passes.

The tooth tip surface 46 of the anti-rotation tooth 44 on the outlet side

Connecting stubs 4 adjoin in both circumferential directions 51, 53 (FIG. 1) via edges the two concave surfaces 56 and 58, respectively, which merge into the machined annular peripheral surface 62 which is axially adjacent to the grooves 29.

The tooth tip surface 45 of the anti-rotation tooth 42 on the inlet side

Connecting stubs 8 close in both circumferential directions 51, 53 via edges also two concave surfaces 56 and 58, which merge into the machined annular peripheral surface 60. This also machined surface 60 is the lateral surface 30 associated and has at the border to the remaining surface of the lateral surface 30 a paragraph.

The two narrow surfaces 60, 62 and the concave surfaces 56, 58 of the

Anti-rotation teeth 42, 44 are produced in one operation with a shell end mill 52, which is described below in FIGS. 3 and 4 on the basis of the outlet side

Connecting stub 4 is representative of the two connecting pieces 4, 8 is shown. In this case, one of a spindle, not shown, a machine tool driven rotating Walzenfrom end mill 52 is guided at a constant radial distance from the central axis 16 of the connecting piece 4 to the connecting piece 4. Consequently, at the same time the abutment flange surface 36 of the radial compressor housing 2 and the narrow surface 60 of the lateral surface 27 of the connecting piece 4 are machined. In this case, the abutment flange surface 36 is machined by the front-end milling part 68 of the end mill cutter 52, whereas the annular peripheral surface 62 is machined by the peripheral milling part 70 of the end mill cutter 52.

In order for the cylindrical end mill 52 to be able to produce the narrow surfaces 60, 62 surrounding the central axis 14 and 16, each with a diameter D1 smaller than the maximum outer diameter D2 of the slip-on aids 22, 24, the cylindrical end mill 52 has an outer diameter D3 which is bigger than his

Shaft diameter D4.

The shell end mill 52 is guided in the direction of the connecting piece 4 in a first method step for producing the concave surface 58, which forms the first lateral surface of the anti-rotation tooth 44. In order to prevent the shell end mill 52 from colliding with the plug-in aid 22 on its travel path, the shell end mill 52 is guided radially from the outside in the direction of the central axis 16 until it has reached a starting position. Alternatively, it is also possible to

Shell end mill 52 to lead on an oblique travel from the outside to the starting position.

As soon as the shell end milling cutter 52 has reached the starting position, it is moved in a transverse direction in a second method step according to FIG. 4, which is defined by two dimensions transversely to the central axis 16.

In this case, the shell end milling cutter 52 is guided around the central axis 16 in order to produce the abutment flange surface 36. Subsequently, the shell end milling cutter 52 is used in a third method step for producing the second concave surface 56 of the

Anti-rotation tooth 44 in the radially from the central axis 16 of the

Connecting flange pioneered direction. The surface 60 as part of the lateral surface 30 and also the concave surfaces 56, 58 adjoins the Anlageflanschfläche 36 via a constant tool radius R.

Fig. 6 shows in a plan view an alternative embodiment of

Gas guide pipe. It is instead of the recess 19 for receiving the

Anti-rotation tooth 42 and 44 provided a slot, so that the correct engagement of the anti-rotation tooth 42 and 44 after assembly can still be controlled. Also in this alternative embodiment is analogous to that shown in FIG

Gas guide pipe provided a clamp with which the elastically deformable, tubular gas guide pipe is pressed radially against the connecting piece.

In an alternative embodiment, in which the lateral surface 30 of the

Joint is also smooth, can be dispensed with a paragraph to the annular circumferential narrow surface 60, so that the lateral surface 30 is uniform.

Claims

claims

1. Radial compressor housing (2) of an exhaust gas turbocharger, which is integral with

a connection piece (4; 8) having a jacket surface (27; 30),

an anti-rotation tooth (42; 44) projecting outwardly from the lateral surface (27; 30) and

- A Aufsteckhilfe (22, 24) at one end portion (26, 28) of the

Around the central axis (14; 16) and which tapers at least in regions in the direction of the end (32; 33) of the connection piece (4; 8) pointing away from the radial compressor housing (2),

characterized in that

the plug-in aid (22; 24) has a region (34) which, starting from the

Outer surface (27; 30) protrudes radially outward.

2. Radial compressor housing according to claim 1,

characterized in that

the connection stub (4; 8) and the lateral surface (30; 27) are arranged coaxially to the central axis (14; 16) and in that the anti - rotation tooth (42; 44) extends from a abutment flange surface (36; 37) of a abutment flange (38; ) for one

Gas guide pipe (18) in the direction of the Aufsteckhilfe (22, 24) parallel to

Central axis (14; 16) extends.

3. Radial compressor housing according to claim 2,

characterized in that

the abutment flange surface (36; 37) lies in a plane perpendicular to the central axis (14; 16).

4. Radial compressor housing according to one of the preceding claims, characterized in that the anti-rotation tooth (42; 44) has a tooth tip surface (45; 46) which extends at a constant radial distance from the central axis (14; 16) over the entire length of the anti-rotation tooth (42; 44) in the direction of the abutment flange (38 or 40). extends and lossatzlos in its outer surface (48; 50) passes.

5. Radial compressor housing according to one of the preceding claims, characterized in that

the anti-rotation tooth (42; 44) of the tooth head surface (45; 46) in both circumferential directions via machined concave surfaces (56, 58) in a machined further surface (60; 62) of the lateral surface (30; in that both the concave surfaces (56, 58) and the further surface (60, 62) are in contact with the abutment flange surface (36, 37) via a tool

constant radius (R) connects.

6. Radial compressor housing according to one of the preceding claims, characterized in that

the surface of the lateral surface (27) between the anti-rotation tooth (44) and the plug-in aid (24) has a plurality of successive grooves (29), with which the maintenance of a gas guide pipe (18) plugged onto the connecting piece (4) can be improved.

7. Radial compressor housing according to one of the preceding claims, characterized in that

the plug-in aid (22; 24) starting from an area with its maximum

Outer diameter (D2) tapers in directions on the abutment flange (38; 40).

8. radial compressor housing according to one of the claims 6 or 7,

characterized in that

the connecting piece is a first connecting piece (4), which is assigned to the outlet side (12) of the fresh gas stream, on the inlet side (10) another

Connection piece (8) is associated, which has a further Anlageflanschfläche (37) and another Aufsteckhilfe (24), wherein the surface of the lateral surface (27) between the further Anlageflanschfläche (37) and the other Aufsteckhilfe (24) in

Essentially smooth.

9. A method for producing a radial compressor housing according to one of

previous claims,

characterized in that

a rotating barrel end mill (52) having an outer diameter (D3) greater than its shank diameter (D4) is guided around the connecting sleeve (4; 8) at a constant radial distance from the central axis (14; 16) of the connecting sleeve (4; is, so at the same time a Anlageflanschfläche (36, 37) to invest a

Gas guide tube (18) and a lateral surface (30; 27) of the connecting piece (4; 8) are machined and that a narrow range of

Lateral surface (30; 27) connect two concave surfaces (56; 58), which are also machined by the shell end mill (52) and the side surfaces of the anti-rotation tooth (42; 44) form.

10. The method according to claim 9,

characterized in that

the shell end mill (52) in a first method step for producing the first concave surface (56) of the anti-rotation tooth (42; 44) in the direction of the

Connecting the neck (4; 8) is guided and that the shell end mill (52) in a second method step for producing the abutment flange surface (36; 37) to the

And that the shell end mill (52) in a third process step for producing the second concave surface (58) of the

Anti-rotation tooth (42; 44) is guided in the direction away from the connecting piece (4; 8) direction.