JPH0318666Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device for switching gas passages in a turbine housing in an exhaust supercharger installed in a diesel engine or the like.

Prior Art As shown in Japanese Unexamined Patent Publication No. 58-172427, a partition plate is provided in the turbine housing to form first, second, and third gas passages, and the first, second, and
The connection of the third passage to the first and second gas supply passages is controlled by the butterfly-type first and second switching valves, and engine exhaust gas is supplied to the first, second, and third gas passages when the engine rotates at high speed. However, a system in which engine exhaust gas is supplied to the first and second gas passages when the engine rotates at low speed is already known.

However, with this structure, in order to efficiently supply exhaust gas to the gas passage and prevent deterioration of turbine performance, it is necessary to minimize the gap between the switching valve and the inner wall of the turbine housing. The inner wall of the housing must be machined, which is very troublesome and increases the processing cost.

In addition, in order to improve the rigidity of the switching valve, it is necessary to make the plate-shaped switching valve and the shaft into an integrated structure.
Due to assembly and machining reasons, it is necessary to construct the switching valve mounting part of the turbine housing separately from other parts, which complicates the structure, impairs maintainability, and increases cost. It also becomes more expensive.

Furthermore, even with the above-mentioned configuration, the switching valve is plate-shaped, and therefore has low rigidity and poor durability.

Purpose of the invention The purpose is to provide a simple structure that is easy to assemble and maintain, allows exhaust gas to be efficiently supplied to the gas passage, and also reduces costs and improves durability.

Structure of the invention A rotary valve that connects multiple gas passages and a gas supply port is rotatably inserted into the turbine housing through a hole formed in the turbine housing.
The gas supply port and gas passage are disconnected by rotating a rotary valve.

Embodiment FIG. 1 is a sectional view of a turbine of an exhaust supercharger,
A blade wheel 2 faces inside the turbine housing 1, and first and second partition plates 3, 4 are integrally formed on the inner wall 1a of the turbine housing 1.
Second and third gas passages 5, 6, and 7 are formed, and engine exhaust gas is supplied to the first, second, and third gas passages 5, 6, and 7, and
A rotary valve 8 is provided on the inflow side of the turbine housing 1.

As shown in FIGS. 2 to 6, this rotary valve 8 has first and second partition walls 11 and 12 integrally formed between a pair of discs 9 and 10, and a rotating shaft 13 on one disc 9. A support shaft 14 is integrally formed on the other disc 10, a large diameter hole 15 is formed in one side wall 1b of the turbine housing 1, and a small diameter hole 16 and a circular recess 17 are formed in the other side wall 1c. is formed, the rotary valve 8 is inserted through the large diameter hole 15 so that the other disc 10 faces the concave portion 17, and the support shaft 14 is fitted into the small diameter hole 16, and one disc 9 is opened. A cover 18 is fitted and fixed to the large diameter hole 15 so as to face the large diameter hole 15, and the rotary shaft 13 projects outward from the hole 19.

A large diameter hole 20 into which the disks 9 and 10 are rotatably fitted is formed in the second partition plate 4, and a large diameter hole 20 is formed in the second partition plate 4.
The end surface 3a of the turbine housing 1 has an arcuate shape in contact with the disks 9 and 10, and the second partition plate 4 separates the first and second gas supply ports 21 and 22. An arcuate recess 23 is formed in which the discs 9 and 10 are rotatably in contact.

When the rotary valve 8 is placed in the position shown in FIG. The exhaust gas that flows into the gas passage 6 and flows through the first gas supply port 21 is blocked by the second partition wall 12 from flowing into the second gas passage 6 and flows into the first gas passage 5, so that the exhaust gas flows into the first gas passage 5. 1,
The gas is ejected from the second gas passages 5 and 6 to the blade wheel 2 of the turbine.

When the rotary valve 8 is rotated to the position shown in FIG. located between the first and second gas supply ports 21 and 22 and the first, second and third gas passages 5,
6 and 7 are in communication with each other, exhaust gas is ejected from the first, second, and third gas passages 5, 6, and 7 to the impeller 2.

Because of this, the rotary valve 8 can control the supply of exhaust gas to the first, second, and third gas passages 5, 6, and 7.

In addition, since the large diameter hole 15, recessed portion 17, small diameter hole 16, and large diameter hole 20 can be machined from the outside using a rotary tool in the turbine housing 1, machining can be performed easily and machining costs can be reduced. In addition, the outer peripheral surface of the rotary valve 8 and the turbine housing 1
Large diameter hole 15, recessed part 17, and small diameter hole 1 formed in
6. The gap with the hole 20 can be made small, and exhaust gas can be efficiently supplied to the gas passages 5, 6, and 7.

Furthermore, since it is only necessary to machine a part of the turbine housing 1 as described above, the turbine housing 1 can be integrated, and the rotary valve 8 can be inserted and extracted from the large diameter hole 15, making assembly easier. , helps improve maintainability.

Further, by using the rotary valve 8, the rigidity is increased and durability can be improved.

Effects of the invention Large diameter hole 15, circular recess 17, and small diameter hole 1 for inserting the rotary valve 8 into the turbine housing 1
6. Since it is sufficient to form the arc-shaped recess 23, its machining is simple, and the turbine housing 1 can be integrated, resulting in a simple structure and low cost.

By removing the cover 18, the rotary valve 8 can be inserted into or removed from the large diameter hole 15 of the turbine housing 1, improving ease of assembly and maintenance.

The rotary valve 8 has a plurality of partition walls 11 and 12 between a pair of discs 9 and 10, a rotation shaft 13 on one disc 9, and a support shaft 1 on the other disc 10.
4, the rigidity of the rotary valve 8 itself can be strengthened and durability can be improved.

One disc 9 is rotatably fitted into the large diameter hole 15, and the other disc 10 is rotatably fitted into the circular recess 17. Since it is flush with the inner surface, only the plurality of partition walls 11 and 12 of the rotary valve 8 are located in the turbine housing 1, and the rotary valve 8 can reduce the exhaust gas flow area and reduce the flow resistance. Moreover, since any one of the partition walls protrudes into the arc-shaped recess 23 formed in the one end wall 1d of the turbine housing 1 and is continuous with the one end wall 1d, a plurality of gas supply ports are provided. The exhaust gas that has flowed into 21 and 22 can be efficiently supplied to the plurality of gas passages 5, 6, and 7.

Since the support shaft 14 fits into the small diameter hole 14 and the rotating shaft 13 protrudes from the hole 19 of the cover 18, the rotary valve 8 is rotatably supported by the support shaft 14 and the rotating shaft 13, and the disc 9, 10 and the separations 11 and 12 can be prevented from contacting the turbine housing 1, so the rotary valve 8 can be rotated smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a sectional view of a turbine, FIG. 2 is a sectional view taken along the - line in FIG. 1,
Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 is a perspective view of the rotary valve, Figures 5 and 6 are sectional views taken along the - line and - line in Figure 3, and Figure 7 is an operation explanatory diagram. It is. 1 is a turbine housing, 3 and 4 are partition plates,
5, 6, 7 are gas passages, 8 is a rotary valve, 2
1 and 22 are gas supply ports.

Claims (1)

[Claims for Utility Model Registration] A plurality of partition plates 3, 4 are provided on the inner wall 1a of the turbine housing 1 to form a plurality of gas passages 5, 6, 7,
A plurality of gas supply ports 21 continuous with the gas passage,
22, and the plurality of gas supply ports 21, 22
In a turbine housing gas passage switching device for an exhaust supercharger, in which some of the plurality of gas passages 5, 6, and 7 are communicated and shut off by a rotary valve 8, the rotary valve 8 is connected to a pair of discs 9, 10.
A plurality of partition walls 11 and 12 are provided between them, a rotary shaft 13 is provided on one disk 9, and a support shaft 14 is provided on the other disk 10, and a rotary valve is provided on one side wall 1b of the turbine housing 1. A large diameter hole 15 is formed through which the pair of discs 9 and 10 of 8 are inserted, and a circular recess 17 into which the other disc 10 is fitted into the other side wall 1c and a small diameter hole into which the support shaft 14 is fitted. 16, and furthermore, the disk 9,
The rotary valve 8 is inserted into the turbine housing 1 through the large diameter hole 15, and the other disc 10 is fitted into the circular recess 17, and the support shaft 14 is inserted into the turbine housing 1. Small diameter hole 16
By fitting the discs 9, 10 to one side wall 1b,
It is rotatably disposed so as to be flush with the inner surface of the other side wall 1c, and a cover 18 for closing the large diameter hole 15 is attached to the one side wall 1b, and the rotating shaft 13 is made to protrude from the hole 19 of the cover 18. A turbine housing gas passage switching device for an exhaust supercharger, characterized in that: