U.S. patent application number 12/642035 was filed with the patent office on 2010-07-01 for charging device.
Invention is credited to Jasmin Hausser, Timo Tries.
Application Number | 20100166541 12/642035 |
Document ID | / |
Family ID | 42060871 |
Filed Date | 2010-07-01 |
United States Patent
Application |
20100166541 |
Kind Code |
A1 |
Hausser; Jasmin ; et
al. |
July 1, 2010 |
CHARGING DEVICE
Abstract
The invention relates to a charging device (1), more preferably
an exhaust gas turbocharger for a motor vehicle, with a turbine
housing (3) adjoining a bearing housing (2), in which a variable
turbine geometry (4) is arranged. It is substantial for the
invention that a one-piece disc spring (5) of plate with a bent
over edge region is provided, wherein the bent over edge region
forms a spring leg (6), while a protective leg (7) is designed as
heat protection for the spring leg (6), that the spring leg (6) on
the one hand supports itself on the bearing housing (2) and on the
other hand on the variable turbine geometry (4), preloading the
latter against the turbine housing (3).
Inventors: |
Hausser; Jasmin; (Fellbach,
DE) ; Tries; Timo; (Schwieberdingen, DE) |
Correspondence
Address: |
RADER, FISHMAN & GRAUER PLLC
39533 WOODWARD AVENUE, SUITE 140
BLOOMFIELD HILLS
MI
48304-0610
US
|
Family ID: |
42060871 |
Appl. No.: |
12/642035 |
Filed: |
December 18, 2009 |
Current U.S.
Class: |
415/148 |
Current CPC
Class: |
F01D 17/165 20130101;
F05D 2220/40 20130101; F02C 6/12 20130101 |
Class at
Publication: |
415/148 |
International
Class: |
F04D 29/56 20060101
F04D029/56 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 20, 2008 |
DE |
10 2008 064 299.1 |
Claims
1. An exhaust gas turbocharger device comprising: a turbine housing
adjoining a bearing housing, in which a variable turbine geometry
is arranged, such that a one-piece disc spring includes at least
one bent over edge region, wherein the bent over edge region forms
a spring leg, and a protective leg as heat protection for the
spring leg, such that the spring leg supports itself on at least
one of the bearing housing and on the variable turbine geometry,
preloading the latter against at least one of the turbine housing,
a cover disc and a cage.
2. The exhaust gas turbocharger device according to claim 1,
wherein the bent over edge region is closed in a circumferential
direction.
3. The exhaust gas turbocharger device according to claim 1,
wherein the bent over edge region is interrupted and comprises a
plurality of straps in a circumferential direction.
4. The charging device according to claim 1, wherein the bent over
edge region is arranged in at least one of outside and inside.
5. The charging device according to claim 1, wherein the bent over
edge region is produced through at least one of flanging and
folding.
6. The charging device according to claim 1, wherein the variable
turbine geometry includes a blade bearing race including a contact
surface which the disc spring abuts.
7. The charging device according to claim 1, wherein at least one
of the spring leg and the protective leg supports itself on the
bearing housing of the charging device.
8. The charging device according to claim 1, wherein the disc
spring is a heat shield.
9. The charging device according to claim 2, wherein the bent over
edge region is arranged in at least one of outside and inside.
10. The charging device according to claim 2, wherein the bent over
edge region is produced through at least one of flanging and
folding.
11. The charging device according to claim 2, wherein the variable
turbine geometry includes a blade bearing race including a contact
surface, having a radial stage which the disc spring abuts.
12. The charging device according to claim 2, wherein at least one
of the spring leg and the protective leg supports itself on the
bearing housing of the charging device.
13. The charging device according to claim 2, wherein the disc
spring is a heat shield.
14. The charging device according to claim 3, wherein the bent over
edge region is arranged in at least one of outside and inside.
15. The charging device according to claim 3, wherein the bent over
edge region is produced through at least one of flanging and
folding.
16. The charging device according to claim 3, wherein the variable
turbine geometry includes a blade bearing race including a contact
surface, more preferably a radial stage which the disc spring
abuts.
17. The charging device according to claim 3, wherein at least one
of the spring leg and the protective leg supports itself on the
bearing housing of the charging device.
18. The charging device according to claim 3, wherein the disc
spring is a heat shield.
19. The charging device according to claim 4, wherein the bent over
edge region is produced through at least one of flanging and
folding.
20. The charging device according to claim 4, wherein the variable
turbine geometry includes a blade bearing race including a contact
surface, having a radial stage which the disc spring abuts.
Description
[0001] The present invention relates to a charging device, more
preferably an exhaust gas turbocharger for a motor vehicle,
according to the preamble of claim 1.
[0002] In modern motor vehicles, so-called exhaust gas
turbochargers with variable turbine geometries are increasingly
employed, wherein the power outputs and the response
characteristics can be adapted to different operating conditions of
the combustion engine. The variable turbine geometries employed
here mostly have rotatable guide blades and are usually preloaded
by means of a spring device, more preferably by means of a disc
spring, relative to a bearing and/or a turbine housing of the
charging device. Because of the high temperatures when operating
the charging device a decline of the spring force of the disc
spring can occur however, as a result of which the operation of the
charging device can be impaired.
[0003] From EP 1 672 177 A1 a generic exhaust gas turbocharger with
a cartridge for the variable turbine geometry arranged in a turbine
housing is known. Here, the variable turbine geometry is fixed by
means of a Woodruff key which is constructed of at least two
material layers. The one material layer is intended to generate the
axial preload force while the other material layer merely serves as
a heat shield for the resilient material layer. The manufacture of
such a disc spring however is involved and consequently
expensive.
[0004] The present invention deals with the problem of stating an
improved embodiment for a charging device of the generic type which
is more preferably producible more cost effectively. According to
the invention, this problem is solved through the subject of the
independent Claim 1. Advantageous embodiments are the subject of
the dependent claims.
[0005] The invention is based on the general idea of providing a
charging device with a variable turbine geometry with a one-piece
disc spring with a bent over edge region embodied of plate, wherein
the bent over edge region forms a spring leg, while the protective
leg of the disc spring which compared with the spring leg according
to FIG. 1 is radially orientated, is embodied as heat shield for
the spring leg. Here, the spring leg on the one hand supports
itself on a bearing housing of the charging device and on the other
hand on the variable turbine geometry, preloading the latter
against the turbine housing. It is obviously also conceivable that
the disc spring preloads the variable turbine geometry against a
guide blade cage or on a cover disc. Through the one-piece disc
spring embodied of plate, which by means of a later forming
operation receives its bent over edge region, a
temperature-insensitive, that is extremely resistant disc spring
can be created which maintains its spring force even under
extended, high thermal load. The term "bent over" is to be merely
understood purely exemplarily for different forming methods, so
that a flanged-over or offset edge region can also be included
under the invention. The disc spring produced in this manner is of
a simple construction and shaped by means of a simple forming
method and consequently producible extremely cost-effectively. In
addition, the protective leg of the disc spring brings about
protection against excessively high temperatures, as a result of
which the disc spring in turn can be improved with respect to its
performance and its lifespan. In contrast with the prior art, the
disc spring according to the invention is not produced of two
different materials, but merely of a single material.
[0006] With an advantageous further development of the solution
according to the invention the bent over edge region of the disc
spring is embodied interrupted in circumferential direction and
comprises a plurality of straps. The interruptions provided in
circumferential direction can be produced simply by means of a
suitable stamping method with disc spring initially still flat,
wherein the stamped-out straps can simply be bent over in a later
forming step. Obviously it is also conceivable as an alternative
that the bent over edge region is embodied closed in
circumferential direction, although this results in higher internal
stresses caused by the forming process, the spring force of the
disc spring according to the invention can however be increased on
the whole. Irrespective of whether the bent over edge region in
circumferential direction is embodied closed or interrupted, both
alternatives can however be produced simply and thus
cost-effectively from a production point of view.
[0007] Further important features and advantages of the invention
are obtained from the subclaims, from the drawings and from the
corresponding figure description by means of the drawings. It is to
be understood that the features mentioned above and still to be
explained in the following are not only usable in the respective
combinations stated but also in other combinations or by
themselves, without leaving the scope of the present invention.
[0008] Preferred exemplary embodiments of the invention are shown
in the drawings and are explained in more detail in the following
description, wherein identical reference characters refer to
identical or similar or functionally identical components.
[0009] Here it shows, in each case schematically,
[0010] FIG. 1 a sectional view through a charging device according
to the invention in the region of a variable turbine geometry,
[0011] FIGS. 2,3 differently configured disc springs,
[0012] FIG. 4 a sectional view through a disc spring according to
FIG. 2,
[0013] FIG. 5 a view as in FIG. 1, however with another
embodiment,
[0014] FIGS. 6,7 differently configured disc springs,
[0015] FIG. 8 a view as in FIG. 1, however with a further
embodiment,
[0016] FIGS. 9,10 differently configured disc springs.
[0017] According to FIG. 1, a charging device 1 according to the
invention, which more preferably can be designed as an exhaust gas
turbocharger for a motor vehicle, comprises a turbine housing 3
adjoining a bearing housing 2, in which a variable turbine geometry
4 is arranged. According to the invention, a one-piece disc spring
5, that is formed of a single continuous material, of plate with an
edge region bent over on the outside is provided, wherein the bent
over edge region forms a spring leg 6, while the compared with the
spring leg 6 radial protective leg 7 serves as heat shield for the
spring leg 6. Obviously the protective leg 7 can also be embodied
bent the other way round, that is inside. Here, the spring leg 6 on
the one hand supports itself on the bearing housing 2 and on the
other hand on the variable turbine geometry 4, preloading the
latter against the turbine housing 3.
[0018] In principle the disc spring 5 can have different
configurations as is for example shown according to FIGS. 2 and 3.
With the disc spring 5 according to FIG. 2 the bent over edge
region is closed in circumferential direction, while this bent over
edge region according to FIG. 3 is designed interrupted in
circumferential direction and comprises a plurality of straps 8.
The term "bent over" obviously is not only intended to mean a
bending method, so that the edge region for example can also be
offset or flanged or folded.
[0019] The straps 8 shown according to FIG. 3 are usually stamped
out when stamping out the basic shape of the disc spring 5 and
subsequently bent over. In contrast with this, with a disc spring 5
according to FIG. 2, the edge region is bent over completely, when
not inconsiderable stresses occur during the forming operation.
However, these stresses can subsequently contribute to an increase
in the strength of the disc spring 5.
[0020] Further considering FIG. 1 it is possible to see that both
the spring leg 6 as well as the protective leg 7 support themselves
on the bearing housing 2 of the charging device 1 while a blade
bearing race 9 of the variable turbine geometry 4 comprises a
suitable contact surface 10, more preferably a radial stage, which
the disc spring 5 abuts on the other end.
[0021] A particular advantage with the disc spring 5 according to
the invention is that on the one hand it can be produced simply and
cost-effectively and on the other hand its springy effect is
retained in the long term since the protective leg 7 acts as heat
shield for the spring leg 6. Because of this, the temperature in
the disc spring 5, more preferably at the contact point of the disc
spring 5 with the blade bearing race 9 can be lowered, which
increases both its spring force as well as its lifespan. Generally,
the disc spring 5 according to the invention can be employed for
both diesel and spark ignition engines.
[0022] As on the contact surface 10 of the blade bearing race 9,
contact surfaces 10' and 10'' can also be provided on the bearing
housing 2, on which the spring leg 6 and the protective leg 7 rest
respectively in order to achieve a certain sealing effect. Through
the preload force generated by means of the disc spring 5 the
variable turbine geometry 4 is pressed in the direction of the
turbine housing 3 and thus held in position. Obviously a disc
spring 5 of this type can generally be also employed for additional
fixing purposes with a charging device 1, more preferably for
example for fixing a bearing disc or a variable turbine
geometry.
[0023] According to FIGS. 5 and 8, the charging device 1 according
to the invention likewise comprises a turbine housing 3 adjoining
the bearing housing 2, in which the variable turbine geometry 4 is
arranged. According to the invention, a one-piece disc spring 5
that is formed of a single continuous material of plate with an
edge region (see FIG. 5) bent over on the inside is provided, which
bent over edge region the spring leg 6 adjoins, while the compared
with the spring leg 6 radial protective leg 7 serves as heat shield
for the spring leg 6. Here the spring leg 6 supports itself on the
bearing housing 2 on the one hand and on the variable turbine
geometry 4 on the other hand, preloading the latter against the
turbine housing 3.
[0024] In principle the disc spring 5 can have different
configurations as is shown for example in FIGS. 6 and 7. With the
disc spring 5 according to FIG. 6 the bent over edge region is
closed in circumferential direction, while this bent over edge
region according to FIG. 7 is designed interrupted in
circumferential direction and comprises a plurality of straps 8.
This applies in the same manner also to the disc springs 5 shown
according to FIGS. 9 and 10.
[0025] Further considering FIG. 5 one can see that both the spring
leg 6 as well as the protective leg 7 support themselves on the
blade bearing race 9 of the charging device 1, specifically in the
region of contact surfaces 10a and 10b, which more preferably are
embodied in the manner of a radial stage.
[0026] Here, the protective leg 7 of the disc spring 5 generally
contacts the bearing housing 2 if a sealing function is desired,
but need not necessarily so if for example no sealing is
required.
* * * * *