U.S. patent application number 13/489752 was filed with the patent office on 2013-05-02 for turbine housing of turbocharger for vehicle.
This patent application is currently assigned to Hyundai Motor Company. The applicant listed for this patent is DONG HO CHU, KIL MIN MOON, SANG JOON PARK, KYUNG SUB SUNG. Invention is credited to DONG HO CHU, KIL MIN MOON, SANG JOON PARK, KYUNG SUB SUNG.
Application Number | 20130108429 13/489752 |
Document ID | / |
Family ID | 48084470 |
Filed Date | 2013-05-02 |
United States Patent
Application |
20130108429 |
Kind Code |
A1 |
SUNG; KYUNG SUB ; et
al. |
May 2, 2013 |
TURBINE HOUSING OF TURBOCHARGER FOR VEHICLE
Abstract
A turbine housing of a turbocharger for a vehicle that may be
connected to an exhaust manifold and in which a turbine wheel may
be rotated using kinetic energy of exhaust gas therein, may include
a turbine wheel accepting portion having a circular hole shape so
as to receive the turbine wheel therein, a scroll portion
surrounding the turbine wheel accepting portion therein, wherein an
exhaust gas passage may be formed along a rotating direction of the
turbine wheel through the scroll portion, a partition dividing the
exhaust gas passage of the scroll portion into at least two
passages, and a slit formed at the partition in a radial direction
of the partition.
Inventors: |
SUNG; KYUNG SUB;
(Hwaseong-si, KR) ; MOON; KIL MIN; (Seongnam-si,
KR) ; CHU; DONG HO; (Ansan-si, KR) ; PARK;
SANG JOON; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SUNG; KYUNG SUB
MOON; KIL MIN
CHU; DONG HO
PARK; SANG JOON |
Hwaseong-si
Seongnam-si
Ansan-si
Seoul |
|
KR
KR
KR
KR |
|
|
Assignee: |
Hyundai Motor Company
Seoul
KR
|
Family ID: |
48084470 |
Appl. No.: |
13/489752 |
Filed: |
June 6, 2012 |
Current U.S.
Class: |
415/205 |
Current CPC
Class: |
F01D 9/026 20130101;
F05D 2220/40 20130101 |
Class at
Publication: |
415/205 |
International
Class: |
F01D 1/06 20060101
F01D001/06 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 31, 2011 |
KR |
10-2011-0112248 |
Claims
1. A turbine housing of a turbocharger for a vehicle that is
connected to an exhaust manifold and in which a turbine wheel is
rotated using kinetic energy of exhaust gas therein, the turbine
housing comprising: a turbine wheel accepting portion having a
circular hole shape so as to receive the turbine wheel therein; a
scroll portion surrounding the turbine wheel accepting portion
therein, wherein an exhaust gas passage is formed along a rotating
direction of the turbine wheel through the scroll portion; a
partition dividing the exhaust gas passage of the scroll portion
into at least two passages; and a slit formed at the partition in a
radial direction of the partition.
2. The turbine housing of claim 1, wherein the partition includes:
a scroll wall extending from an inner surface of the scroll portion
toward a center of the turbine housing; and a scroll tip formed at
an end portion of the scroll wall, wherein the scroll tip is
thinner than the scroll wall.
3. The turbine housing of claim 2, wherein the scroll portion
includes inner rims extending from an inner surface of the turbine
housing and the scroll tip is disposed between the rims to deliver
the exhaust gas to the turbine wheel through openings formed
between the rims and the scroll tip.
4. The turbine housing of claim 3, wherein a diameter of the rims
is shorter than that of the scroll tip.
5. The turbine housing of claim 1, wherein at least a portion of
the exhaust gas passage of the scroll portion is open toward the
turbine wheel so as to deliver the kinetic energy of the exhaust
gas to the turbine wheel.
6. The turbine housing of claim 1, wherein a width of the slit is
constant along the radial direction of the partition.
7. The turbine housing of claim 6, wherein the width of the slit is
between approximately 0.2 mm and approximately 0.4 mm.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to Korean Patent
Application No. 10-2011-0112248 filed in the Korean Intellectual
Property Office on Oct. 31, 2011, the entire contents of which is
incorporated herein for all purposes by this reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a turbine housing of a
turbocharger for a vehicle. More particularly, the present
invention relates to a turbine housing of a turbocharger for a
vehicle that improves durability.
[0004] 2. Description of Related Art
[0005] Generally, engine output per cycle can be increased when
pressure of intake air flowing into a cylinder of an engine is
increased to higher than atmospheric pressure and an air amount in
the cylinder is increased. This is called supercharging. Mechanical
supercharging deteriorates thermal efficiency even though
crankshaft power is increased since output of a crankshaft is used
for compressing the intake air.
[0006] In order to solve the problem, the turbocharger has been
developed. According to the turbocharger, a compressor fixedly
connected with an exhaust turbine feeds air into the cylinder when
the exhaust turbine is operated by energy from exhaust gas.
Therefore, engine output is improved. The turbocharger is widely
used with diesel engines where a knocking problem does not
generally occur as opposed to a gasoline engine where knocking
occurs if the pressure in the cylinder is excessively increased by
supercharging.
[0007] In detail, in the turbocharger, a turbine wheel that
recovers exhaust energy and a compressor wheel that delivers
compressed air to the cylinder are disposed on respective ends of
the same shaft, and a housing for leading flow of the exhaust gas
and the air covers each wheel. Particularly, the turbine housing is
divided into a single scroll type having one exhaust gas passage
and a twin scroll type having two exhaust gas passages divided by a
partition. The twin scroll type prevents exhaust interference of
the engine and efficiently uses a pulse effect of the exhaust, and
thus rotation efficiency of the turbine wheel can be improved.
[0008] However, a pressure difference between cylinders of the twin
scroll becomes larger in comparison with that of the single scroll,
and thus a side force due to exhaust pulsation is exerted on the
partition. Therefore, a crack in the partition often occurs. In
addition, durability of the partition may be weakened by repeated
expansion and compression due to an abnormal temperature inversion
phenomenon of inner and outer portions of the scroll.
[0009] The information disclosed in this Background of the
Invention section is only for enhancement of understanding of the
general background of the invention and should not be taken as an
acknowledgement or any form of suggestion that this information
forms the prior art already known to a person skilled in the
art.
BRIEF SUMMARY
[0010] Various aspects of the present invention are directed to
providing a turbine housing of a turbocharger for a vehicle having
advantages of improving durability of a partition of the turbine
housing as a twin scroll type.
[0011] In an aspect of the present invention, a turbine housing of
a turbocharger for a vehicle that is connected to an exhaust
manifold and in which a turbine wheel is rotated using kinetic
energy of exhaust gas therein, may include a turbine wheel
accepting portion having a circular hole shape so as to receive the
turbine wheel therein, a scroll portion surrounding the turbine
wheel accepting portion therein, wherein an exhaust gas passage is
formed along a rotating direction of the turbine wheel through the
scroll portion, a partition dividing the exhaust gas passage of the
scroll portion into at least two passages, and a slit formed at the
partition in a radial direction of the partition.
[0012] The partition may include a scroll wall extending from an
inner surface of the scroll portion toward a center of the turbine
housing, and a scroll tip formed at an end portion of the scroll
wall, wherein the scroll tip is thinner than the scroll wall.
[0013] The scroll portion may include inner rims extending from an
inner surface of the turbine housing and the scroll tip is disposed
between the rims to deliver the exhaust gas to the turbine wheel
through openings formed between the rims and the scroll tip.
[0014] A diameter of the rims is shorter than that of the scroll
tip.
[0015] At least a portion of the exhaust gas passage of the scroll
portion is open toward the turbine wheel so as to deliver the
kinetic energy of the exhaust gas to the turbine wheel.
[0016] A width of the slit is constant along the radial direction
of the partition.
[0017] The width of the slit is between approximately 0.2 mm and
approximately 0.4 mm.
[0018] The methods and apparatuses of the present invention may
have other features and advantages which will be apparent from or
are set forth in more detail in the accompanying drawings, which
are incorporated herein, and the following Detailed Description,
which together serve to explain certain principles of the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a perspective view of a turbine housing of a
turbocharger for a vehicle according to an exemplary embodiment of
the present invention.
[0020] FIG. 2 is a schematic diagram of a turbocharger according to
an exemplary embodiment of the present invention.
[0021] FIG. 3 is an enlarged cross-sectional view of a scroll
portion according to an exemplary embodiment of the present
invention.
[0022] FIG. 4 is a perspective view of a partition taken along a
line A-A in FIG. 2.
[0023] It should be understood that the appended drawings are not
necessarily to scale, presenting a somewhat simplified
representation of various features illustrative of the basic
principles of the invention. The specific design features of the
present invention as disclosed herein, including, for example,
specific dimensions, orientations, locations, and shapes will be
determined in part by the particular intended application and use
environment.
[0024] In the figures, reference numbers refer to the same or
equivalent parts of the present invention throughout the several
figures of the drawing.
DETAILED DESCRIPTION
[0025] Reference will now be made in detail to various embodiments
of the present invention(s), examples of which are illustrated in
the accompanying drawings and described below. While the
invention(s) will be described in conjunction with exemplary
embodiments, it will be understood that the present description is
not intended to limit the invention(s) to those exemplary
embodiments. On the contrary, the invention(s) is/are intended to
cover not only the exemplary embodiments, but also various
alternatives, modifications, equivalents and other embodiments,
which may be included within the spirit and scope of the invention
as defined by the appended claims.
[0026] FIG. 1 is a perspective view of a turbine housing of a
turbocharger for a vehicle according to an exemplary embodiment of
the present invention.
[0027] As shown in FIG. 1, a turbine housing 10 of a turbocharger
for a vehicle according to an exemplary embodiment of the present
invention is connected with an exhaust manifold 30, and includes a
scroll portion 11 and a turbine wheel accepting portion 15.
[0028] The turbine housing 10 is adapted to receive exhaust gas
from the exhaust manifold 30. In addition, the turbine housing 10
is adapted to operate a turbine by using kinetic energy of the
exhaust gas.
[0029] The turbine wheel accepting portion 15 is formed with a
circular hole shape penetrating the turbine housing 10.
[0030] The scroll portion 11 forms passages to flow the exhaust gas
along an exterior circumference of the turbine wheel accepting
portion 15.
[0031] FIG. 2 is a schematic diagram of a turbocharger according to
an exemplary embodiment of the present invention.
[0032] As shown in FIG. 2, the scroll portion 11 includes a power
delivery hole 17, a partition 14, and a twin scroll 12, and a
turbine wheel 16 is disposed at the turbine wheel accepting portion
15.
[0033] The power delivery hole 17 is formed along an interior
circumference of the scroll portion 11 such that an exhaust gas
passage of the scroll portion 11 is opened toward the turbine wheel
16 with a predetermined gap.
[0034] The partition 14 is formed to divide the exhaust gas passage
of the scroll portion 11 into two passages, and the two passages
divided by the partition 14 are called the twin scroll 12. In
addition, the partition 14 protrudes from an interior surface of a
radial outside portion of the scroll portion 11 to the proximity of
the power delivery hole 17, and thus the twin scroll 12 is
formed.
[0035] When the exhaust gas is delivered from the exhaust manifold
30 to the turbine housing 10, the exhaust gas rotates around the
turbine wheel 16 along the twin scroll 12. At this time, power of
the exhaust gas is delivered to the turbine wheel 16 through the
power delivery hole 17. Thus, the turbine wheel 16 is rotated.
Arrows in FIG. 2 represent the flow of the exhaust gas supplied
from the exhaust manifold 30.
[0036] The torque of the turbine wheel 16 rotated by the
above-mentioned operation is delivered to a compressor wheel 20,
and the compressed air generated by rotation of the compressor
wheel 20 is delivered to a cylinder. An operation of the
turbocharger that improves output of an engine by these processes
is well-known to a person of ordinary skill in the art such that a
detailed description thereof will be omitted.
[0037] FIG. 3 is an enlarged cross-sectional view of a scroll
portion according to an exemplary embodiment of the present
invention.
[0038] As shown in FIG. 3, the partition 14 dividing the exhaust
gas passage of the scroll portion 11 so as to form the twin scroll
12 includes a scroll wall 14a and a scroll tip 14b.
[0039] The scroll wall 14a refers to a part of the partition 14
protruded from the interior surface of the radial outside of the
scroll portion 11. In addition, the scroll tip 14b refers to
another part of the partition 14 close to the power delivery hole
17. In other words, the scroll tip 14b that is close to the turbine
wheel 16 is heated faster than the scroll wall 14a. Further, the
scroll tip 14b that is formed thinner than the scroll wall 14a
emits heat easily and is cooled quickly. Therefore, the compression
and the expansion of the scroll tip 14b can be excessively
generated in comparison with the scroll wall 14a.
[0040] In an exemplary embodiment of the present invention, the
scroll portion 11 includes inner rims 25 extending from an inner
surface of the turbine housing 10 and the scroll tip 14b is
disposed between the rims 25 to deliver exhaust gas to the turbine
wheel 16 through openings formed between the rims 25 and the scroll
tip 14b.
[0041] Diameter of the rims 25 may be shorter than that of the
scroll tip 14b.
[0042] FIG. 4 is a perspective view of a partition taken along a
line A-A in FIG. 2.
[0043] As shown in FIG. 4, the partition 14 viewed along the line
A-A in FIG. 2 may have an annular shape and includes a slit 18.
[0044] At least one of slits 18 is formed radially at the partition
14 of the annular shape. In addition, each slit 18 is a narrow gap
formed from the scroll tip 14b to the scroll wall 14a so as to cut
the partition 14. Further, the width of the slit 18 may be about
0.2-0.4 mm, and preferably about 0.3 mm.
[0045] Three straight slits 18 cutting the partition 14 are shown
in FIG. 4, but the number and shape of the slits 18 are not limited
to the exemplary embodiment shown in FIG. 4. The number and shape
of the slits 18 can be changed variously by a person of ordinary
skill in the art.
[0046] As described above, since the slits 18 are formed at the
partition 14, durability of the partition 14 that experiences
repeated expansion and compression can be improved. In other words,
since occurrence of a crack at the partition 14 is prevented,
deterioration of the turbocharger can be reduced.
[0047] While this invention has been described in connection with
what is presently considered to be practical exemplary embodiments,
it is to be understood that the invention is not limited to the
disclosed embodiments, but, on the contrary, is intended to cover
various modifications and equivalent arrangements included within
the spirit and scope of the appended claims.
[0048] For convenience in explanation and accurate definition in
the appended claims, the terms "upper", "lower", "inner" and
"outer" are used to describe features of the exemplary embodiments
with reference to the positions of such features as displayed in
the figures.
[0049] The foregoing descriptions of specific exemplary embodiments
of the present invention have been presented for purposes of
illustration and description. They are not intended to be
exhaustive or to limit the invention to the precise forms
disclosed, and obviously many modifications and variations are
possible in light of the above teachings. The exemplary embodiments
were chosen and described in order to explain certain principles of
the invention and their practical application, to thereby enable
others skilled in the art to make and utilize various exemplary
embodiments of the present invention, as well as various
alternatives and modifications thereof. It is intended that the
scope of the invention be defined by the Claims appended hereto and
their equivalents.
* * * * *