JP2015140748A - turbine housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing that can reduce heat stress due to a temperature difference between an inner housing and an outer housing in a turbine housing that includes the inner housing and the outer housing where a space is defined between the inner housing and the outer housing.SOLUTION: The turbine housing 1 includes the inner housing 3 and the outer housing 2 where the space 10 is defined between the inner housing 3 and the outer housing 2. In the turbine housing 1, the inner housing 3 is constituted of two inner shell members 3a, 3b and a partition member 3c provided between both inner shell members 3a, 3b, and a periphery 3d of the inner housing 3 is not coupled to the outer housing 2.

Description

  The present invention relates to a turbine housing such as a turbocharger.

  As a turbine housing for a turbocharger, a cast housing is generally used. However, since it is necessary to consider the hot water flow at the time of casting, the thickness cannot be reduced below a certain level, so there is a limit in terms of weight reduction and heat capacity.

  Therefore, in recent years, it has been proposed to manufacture a turbine housing using a press-formed product of a steel plate (see, for example, Patent Document 1).

Japanese Patent No. 4512058

  The turbine housing described in Patent Document 1 has an inner housing and an outer housing, a gap is formed between the inner housing and the outer housing, the inner housing has two inner shell members, and the outer housing has 2 The outer peripheral members of the two outer shell members are joined via the end portions of the connecting members, and the outer peripheral portions of the two outer shell members are joined via the connecting members. Are joined together. That is, the outer peripheral part of the inner housing and the outer housing is connected by the connecting member.

  Since the exhaust gas flows through the inner housing, the temperature becomes high. However, since the outer housing is disposed with a gap from the inner housing, a temperature difference is generated between the inner housing and the inner housing. There is a risk that the thermal stress due to the temperature difference acts on the connecting member and the durability is impaired.

  Accordingly, an object of the present invention is to provide a turbine housing that solves the above problems.

In order to solve the above-mentioned problem, the invention according to claim 1 is a turbine housing having an inner housing and an outer housing, and a space is provided between the inner housing and the outer housing.
The inner housing is composed of two inner shell members and one partition member provided between the inner shell members,
The outer peripheral portion of the inner housing and the outer housing are not connected.

  According to a second aspect of the present invention, in the first aspect of the present invention, the inner shell member has an inlet portion for introducing a fluid into the inner housing and an outlet portion for discharging the fluid. A tongue is formed by abutting a part of the partition and the partition member, and the tongue prevents the fluid swirling in the inner housing and the fluid in the vicinity of the inlet from being merged. It is what.

  According to the present invention, the inner housing is constituted by two inner shell members and one partition member provided between the inner shell members, a space is provided between the inner housing and the outer housing, and By not connecting the outer peripheral portion of the inner shell member and the outer housing, the thermal stress due to the temperature difference between the inner housing and the outer housing can be reduced, and the durability can be improved as compared with the conventional one.

The front view of the turbine housing used for the Example of this invention. The left view of FIG. The right view of FIG. The top view of FIG. The bottom view of FIG. FIG. 2 is a vertical end view of FIG. 1. FIG. 5 is a lateral end view of FIG. 4. The perspective view of the inner side housing used for the Example of this invention. The disassembled perspective view of the inner side housing used for the Example of this invention. The disassembled perspective view of the turbine housing of the Example of this invention.

A mode for carrying out the present invention will be described based on an embodiment shown in the drawings.
1 is a front view of the turbine housing 1 of the present embodiment, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a right side view of FIG. In some of the drawings, ridge lines are shown so that the curved surface shape can be seen.

  The turbine housing 1 is a turbine housing used in a turbocharger for a vehicle. Exhaust gas, which is a fluid flowing from an engine (not shown), is introduced into the turbine housing 1 from an inlet 11 and passes through the turbine housing 1. While being discharged from the outlet 12, a turbine wheel (not shown) in the through holes 20 and 21 provided in the central portion of the turbine housing 1 is rotationally driven by the flow of the exhaust gas. In addition, the compressor wheel is driven to rotate by the rotation of the turbine wheel, and air is supercharged to the engine.

  The turbine housing 1 includes an outer housing 2, an inner housing 3, an inlet member 4, and an outlet member 5.

  The outer housing 2 is composed of two members, a first outer shell member 2a and a second outer shell member 2b. The first outer shell member 2a and the second outer shell member 2b are produced by press-molding a metal plate material. As a board | plate material used, the thing excellent in corrosion resistance and heat resistance is preferable. A through hole 20 is formed at the center of the outer housing 2.

  The first outer shell member 2a and the second outer shell member 2b bulge outward, and the inner housing 3 can be disposed on the inner side. The first outer shell member 2 a and the second outer shell member 2 b are joined by welding or the like over the entire circumference except for the inlet 11 at the outer peripheral portion.

  An inner housing 3 is disposed in the outer housing 2, and a space 10 is formed between the outer housing 2 and the inner housing 3.

  The inner housing 3 is composed of three members: a first inner shell member 3a, a second inner shell member 3b, and a partition member 3c. The 1st inner shell member 3a, the 2nd inner shell member 3b, and the partition member 3c are produced by press-molding a metal plate material. As a board | plate material used, the thing excellent in corrosion resistance and heat resistance is preferable. The plate thickness of the partition member 3c is preferably equal to or thinner than the plate thickness of the inner shell members 3a and 3b.

  As shown in FIGS. 6 to 8, the partition member 3 c is sandwiched between the first inner shell member 3 a and the second inner shell member 3 b over the entire circumferential direction in the outer peripheral portion other than the inlet 11. In the clamping portion, the inner shell members 3a and 3b and the partition member 3c are joined by welding or the like.

  The outer peripheral portion 3d of the inner housing 3, that is, the outer peripheral portions 3d of the inner shell members 3a and 3b and the partition member 3c, and the outer housing 2 are not connected by bonding or the like, and the space 10 is interposed. A through hole 21 is formed in the central portion of the inner housing 3 so as to penetrate the front and back direction (left and right direction in FIG. 2).

  The first flow path 13 is formed by the inner peripheral surface of the first inner shell member 3a and one surface of the partition member 3c, and the second flow is formed by the inner peripheral surface of the second inner shell member 3b and the other surface of the partition member 3c. A path 14 is formed. The two flow paths 13, 14 are formed in a “-” shape, a part in the circumferential direction is opened and communicated with the inlet 11, and the through hole 21 side of the inner circumferential part is opened and communicated with the outlet 12. doing.

  The fluid that has flowed into the flow paths 13 and 14 from the inlet 11 is swung in the circumferential direction, and then discharged from the opening on the inner peripheral side to the outlet 12. Moreover, the two flow paths 13 and 14 are merged in the vicinity of the turbine wheel.

  The flow paths 13 and 14 are formed so that the cross-sectional area in the vicinity of the opening on the inner peripheral side, that is, in the vicinity of the turbine wheel is narrowed, and the flow velocity of the fluid is increased.

  On the inner peripheral side of the inlet 11 portion, a part of the inner peripheral surface of the first inner shell member 3a, a part of one surface of the partition member 3c, and a part of the inner peripheral surface of the second inner shell member 3b And part of the other surface of the partition member 3c are in contact with each other and joined by welding or the like to form the tongue portion 16. The tongue portion 16 prevents the fluid just flowing in from the inlet 11 and the fluid swirled in the flow paths 13 and 14 from joining together, so that the fluid is smoothly discharged from the outlet 12.

  An inlet member 4 formed in a flange shape is fixed to the opening portion on the inlet 11 side of the inner housing 3. As shown in FIG. 2, the inlet member 4 has two openings 4 a formed vertically, and the opening 4 a constitutes the inlet 11.

  The outlet member 5 includes an annular member 5a and an outlet flange 5b, and the annular member 5a is inserted into the opening of the through hole 20 at the center of the second outer shell member 2b. The annular member 5a is the second outer shell. It is joined to the member 2b by welding or the like. The inner end of the annular member 5a is slidably fitted to a convex portion 22 formed on the inner peripheral side of the second inner shell member 3b. An outlet flange 5b is fixed to the outer end of the annular member 5a to form an outlet 12.

  A mounting flange 25 is fixed in the through hole 21 of the first inner shell member 3a, and a turbine wheel or the like is accommodated in the mounting flange 25.

  As described above, the turbine housing 1 is a twin scroll type turbine housing in which the two flow paths 13 and 14 are formed.

  With the above configuration, the outer housing 2 protects the inner housing 3 and increases the rigidity of the turbine housing 1.

  By providing the space 10 formed between the outer housing 2 and the inner housing 3 and not connecting the outer peripheral portion of the inner housing 3 to the outer housing 2, the heat of the inner housing 3 is transmitted to the outer housing 2. It becomes difficult, has a heat insulation effect, can efficiently convert the energy of the exhaust gas into the rotational motion of the turbine wheel, and can increase the efficiency of the supercharger. Further, since the difference in expansion and thermal stress due to the temperature difference between the inner housing 3 and the outer housing 2 can be reduced as compared with the prior art, the durability of the turbine housing 1 can be made higher than that of the prior art.

  Further, the outer housing 2 is constituted by outer shell members 2a and 2b produced by press molding, and the inner housing 3 is constituted by inner shell members 3a and 3b and partition members 3c produced by press molding, whereby a turbine housing is obtained. 1 can be reduced, the temperature of the exhaust gas during the cold start can be increased, the exhaust gas purification performance can be improved, and the amount of the exhaust gas purification catalyst can be reduced.

  The outer housing 2 is constituted by outer shell members 2a and 2b produced by press molding, and the inner housing 3 is constituted by inner shell members 3a and 3b and a partition member 3c produced by press molding. If the space 10 is provided between the outer housing 3 and the outer peripheral portion 3d of the inner housing 2 and the outer housing 3 are not connected, the outer shell members 2a and 2b, the inner shell members 3a and 3b, and the partition member 3c are Any shape can be used without being limited to the shape shown in the figure.

DESCRIPTION OF SYMBOLS 1 Turbine housing 2 Outer housing 3 Inner housing 3a, 3b Inner shell member 3c Partition member 10 Space 16 Tongue

Claims (2)

In a turbine housing having an inner housing and an outer housing, and providing a space between the inner housing and the outer housing,
The inner housing is composed of two inner shell members and one partition member provided between the inner shell members,
A turbine housing characterized in that the outer peripheral portion of the inner housing is not connected to the outer housing. It has an inlet for introducing fluid into the inner housing and an outlet for discharging the fluid, and a tongue is formed by contacting a part of the inner peripheral surface of the inner shell member and a part of the partition member. The turbine housing according to claim 1, wherein the tongue portion prevents the fluid swirled in the inner housing from confluence with the fluid in the vicinity of the inlet portion.