JPS6149109A - Housing of turbo-charger - Google Patents

Abstract

PURPOSE:To protect a bearing section from a high temperature by forming the turbine housing of a turbo-charger, a heat insulator, and a center housing in one body and providing a space between the heat insulator and the center housing. CONSTITUTION:The turbine housing 5 of a turbo-charger, a center housing 3, and a heat insulator section 21 are continuously formed in one body. A space is provided between the center housing 3 and the heat insulator section 21, and heat is radiated to the outside from a connection section 22 between the turbine housing 5 and the center housing 3 continued via this space. Accordingly, the high temperature on the turbine side is not guided to a bearing section 4, and the bearing section 4 is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a housing for a turbocharger, and more particularly to a housing constructed by interposing a heat insulator between a center housing and a turbine housing in a turbocharger.

[Prior art]

Examples of conventional turbocharger housings of this type include those shown in FIGS. 6(A) and 6(B).

This example is an example of a variable capacity turbocharger in which a swingable tongue member is provided at the scroll inlet, and is disclosed in Japanese Patent Application No. 142,883/1983. Here, 1 is a turbine rotor, 2 is a rotor shaft thereof, and 3 is a center housing in which a bearing portion 4 is provided. Furthermore, 5 is a turbine housing, and in this example, the turbine housing 5 is formed with one side wall 6A of the scroll portion 6 and a peripheral wall 8B corresponding to the outer peripheral portion thereof, and a heat insulator plate 7 is provided between both housings 3 and 5. The retainer plate 8 and bolts 9 constitute an integral assembly.

Thus, the stepped fitting part 12 of the housing cover 11 is fitted into the fitting part 10 of the housing integrated in this way, and the housing cover 11 is fixed with bolts 13. A rotation shaft 15A of the tongue-shaped member 15 is pivotally supported on the side 11 via a bush 14. Furthermore, the housing cover 11 is formed with a facing wall 11A which is finished so as to maintain a predetermined gap between the housing cover 11 and the wing end surface 15B of the tongue member 15 having an airfoil shape in cross section. Furthermore, an inner circumferential wall 6C of the scroll portion 6, a shroud portion 6D, and a gas outlet 6E are formed. Note that here, a predetermined gap is also maintained between the blade end surface 15C on the tip side of the tongue-like member 15 and the opposing wall 5A on the housing 5 side facing thereto.

Reference numeral 16 denotes a backing interposed between the fitting part 10 of the turbine housing 5 and the fitting part 12 of the housing cover 11;
7 is a rotating arm that rotates the rotating shaft 15A, and the rotating arm 17 is operated by a drive device (not shown).
Thus, the tongue member 15 can be swung via the rotation shaft 15A.

However, in the turbocharger housing assembly configured in this way, the heat insulator plate 7, the turbine housing 5, and the center housing 3 are
are formed separately, and the insulator plate 7
flange part. Since the structure is such that the retainer plate 8 is sandwiched between the turbine housing 5 and the center housing 3, and the retainer plate 8 is applied from the outside and fastened with the bolts 9, the gathering portion 18 of these members, In particular, the threaded hole forming part 19 of the turbine housing 5 into which the holding bolt 9 is screwed is thick, and therefore, when there is insufficient cooling, such as when a carrot suddenly stops, the center High heat is conducted to the housing 3 side.

Therefore, since this heat is led to the bearing part 4 of the center housing 3, the metal contained in the bearing member may be precipitated, or carbonization products of lubricating oil that have been carbonized due to the high temperature may be transferred to the bearing part 4. There was a risk that the bearing would become jammed, impairing the bearing's function and significantly reducing its durability.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a turbocharger which has a structure in which the high temperature on the turbine side is not transmitted to the bearing part, so that the function of the bearing part is not impaired, and which can improve workability during assembly. The purpose is to provide housing.

〔composition〕

In order to achieve this object, the present invention adopts a structure in which the heat insulator section is integrally molded with the turbine housing and the center housing.

〔Example〕

EMBODIMENT OF THE INVENTION Below, the Example of this invention is demonstrated in detail based on drawings.

FIG. 1 shows a first embodiment of the invention. In this example, the side wall 6A of the scroll portion 6 and the tongue-like member 15 following the side wall 6A
The opposite wall 15A is extended to the back side of the turbine rotor l to form a heat insulator part 21,
Furthermore, the retainer plate 8 shown in FIG. 6(A) is eliminated, and instead, the turbine basting 5 is smoothly integrated with the center housing 3 near this part to form the connection part 22, and the turbine housing 5 and the insulator part are connected. 21 and the center housing 3 are integrally constructed.

Reference numeral 23 denotes a stepped thermal space formed between the heat insulator section 21 and the center housing 3. In the case of this example, such a stage heat space 23 is ensured, and FIG. 6 (
By eliminating the shaded areas corresponding to the component gathering part 18 and the screw hole forming part 18 of the housing 5 that existed in case A), the heat capacity of this part can be reduced, and the heat on the turbine side can be dissipated. Since the high heat is conducted to the center housing 3 side through the connection part 22 which is easily damaged, high heat is suppressed from flowing into the bearing part 4 even when the engine suddenly stops.

Furthermore, by eliminating the component gathering portion 18 and eliminating the need for the retainer plate 8 and bolts 9, not only is the weight significantly reduced, but the number of parts is also reduced, resulting in a cost reduction. can.

FIG. 2 shows a second embodiment of the invention, where 23A
is a stepped thermal space formed between the heat insulator section 21 and the center housing 3.

In this example, the stage heat space 23A and the connection part 22A are
Compared to the example shown in the figure, it is further enlarged toward the scroll portion 6 side.

With this configuration, not only is high heat from the turbine and scroll side isolated over a wide range from the center housing 3 side by the heat insulator section 21 and the space 23A formed on the back side thereof, but also the high heat from the connection section 2.
Since a sufficiently large heat radiation area of 2 A can be secured, heat transfer to the center housing 3 side can be further controlled.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, the housing cover 11 is formed integrally with the outer peripheral wall SS of the scroll section 6, and is integrated with the heat insulator section 21 via the connecting section 22A. The /X housing 3 and the housing cover 11 are fastened together by bolts 24, and 25 is a gasket interposed between the two.

In the housing configured in this way, by using a highly insulating gasket 25, heat conduction between the housing cover 11 side and one housing assembly is cut off. Heat generated on the housing cover 11 and the scroll outer peripheral wall 6S can be suppressed from being carried into the center housing 3, and the bearing 4
can be further protected from high heat.

Further, FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, a radial line is formed along a connecting part 22A of a housing in which a turbine housing 5, a center housing 3, and a heat insulator part 21 are integrated. By attaching such fins 26 as shown in FIG. 5, the heat radiation area in the connecting portion 22A can be increased and the heat radiation effect can be further enhanced.

Note that although this example shows the case where the fins 26 are attached to the example shown in FIG. 2, the fins 26 are not shown in the corresponding positions for the example shown in FIG. 1 or 3, either. Of course, it is possible to provide fins.

〔effect〕

As described above, according to the present invention, there is provided a turbine housing that houses a radial turbine rotor and in which at least a part of the turbine scroll is formed, and a center housing that is provided with a bearing portion for the rotating shaft of the turbine rotor. Since the heat insulator plate provided along the back surface of the turbine rotor disk is integrally formed with the heat insulating space and the connecting portion, the insulator plate, the turbine housing, and the center housing are joined to each other as in the conventional case. In the case of a housing assembly that is fastened with bolts, the heat capacity of the parts where these parts are joined to each other is large, and when the carrot suddenly stops, the bearing of the center housing can be heated through this part. It is possible to suppress the precipitation of metals contained in the bearing member and the carbonization of lubricating oil due to the high heat introduced into the bearing part, and it is possible to improve the durability of the bearing part. This eliminates the need for retainer plates, bolts, etc. used for fastening, reduces the number of parts, reduces costs, and improves workability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of the first embodiment of the housing of the turbocharger of the present invention, and FIGS. 2, 3, and 954 show the structures of the second, third, and fourth embodiments of the present invention. 5 is a side view of FIG. 4 viewed from the direction of arrow A, FIG. 6(A) is a sectional view showing an example of the configuration of a conventional turbocharger housing, and FIG. B) □ is a side view of the turbine housing viewed from the housing cover side. 1...Turbine rotor, 2...Rotor Tsukuda 1, 3
... Center housing, 4... Bearing section, 5... Turbine housing, 5A... Opposing wall, 6... Scroll section. 6A...Side wall, θB...Peripheral wall, 6C...
...Inner peripheral wall, 6D...Shroud part, 6E
...Gas outlet, 6S...Outer peripheral wall, 7.
...heat insulator plate, 8...retainer plate, 9...bolt. 10.12... Fitting part, IOA... Fitting hole,
11...To the housing, IIA...Opposing wall, 1
3... Bolt, 14... Bush, 1
5... Tongue-shaped member, 15A... Rotating shaft, 15
B, 150... Wing end surface, 16... Backing, 17... Arm, 18... Member gathering part, 13... Screw hole forming part. 21... Heat insulator part, 22.22A... Connection part, 23.23A...
・Insulation space, 24... Bolt, 25...
・Gasket, 26...Fin. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1) A turbine housing that accommodates a turbine rotor and in which at least a portion of a turbine scroll that guides gas to the turbine rotor is formed, a center housing that is provided with a bearing portion for a rotating shaft of the turbine rotor, and the turbine rotor. In the turbocharger housing, the turbocharger housing includes a heat insulator provided along a back surface of a disk, and a housing cover joined to the turbine housing, wherein the turbine housing, the heat insulator, and the center housing are continuous and integrated. a space is provided between at least the heat insulator and the center housing, and heat is radiated to the outside from a connection between the turbine housing and the center housing, which are connected to each other via the space. A turbocharger housing characterized by: