JPH0913980A - Variable displacement supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a trouble on the action of a link by maintaining the gap between the link and the rotation axis with high accuracy. SOLUTION: One end of a link 29 is rotatably supported on a ring member 28, and a vane 25 is rotated by the rotation of the ring member 28 against a vane support body 27 to change the inflow area of an exhaust gas inflow section 23, and this variable displacement supercharger is provided with a circular ring member 35 at the end section of the center pin 23 of the link 29. Even if a bulge is generated at the end section of the center pin 30 of the link 29, the circular ring member 35 is faced to it, no effect of the bulge of the end section is given to the link 29, and the gap between the link 29 and the center pin 30 is maintained with high accuracy so that no trouble occurs on the action of the link 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement supercharger having a large number of vanes at a fluid inflow section, and is suitably applied to an exhaust turbocharger of an internal combustion engine.

[0002]

2. Description of the Related Art The output of an internal combustion engine can be increased without increasing the cylinder volume or the engine speed by supercharging. In order to increase the output, an exhaust turbocharger that uses an exhaust gas energy to perform the driving work of the air compressor is used. The exhaust turbocharger is composed of a compressor and a turbine, and in order to make effective use of exhaust gas energy, the diffuser of the compressor or the vane of the exhaust gas inflow portion of the turbine is movable to make the flow path area variable. Capacity turbochargers are used.

A conventional variable displacement supercharger will be described with reference to FIG. FIG. 5 shows an exhaust gas inflow section of a conventional variable displacement supercharger. As shown in the figure, an exhaust gas passage 2 is formed in a casing 1, and a turbine wheel 4 is provided facing an exhaust gas inlet 3. A large number of vanes 5 are arranged in the exhaust gas inlet 3 in the circumferential direction, and a support shaft 6 of each vane 5 is rotatably supported by a vane support 7. By rotating the vane 5 via the support shaft 6, the flow passage area of the exhaust gas inlet 3 is made variable. Exhaust gas introduced via an exhaust pipe (not shown) passes through the exhaust gas passage 2 and is accelerated by the vanes 5 to drive the turbine wheel 4.

[0004] A ring member 8 is rotatably supported by the vane support 7, and one end of a link 9 is rotatably supported by the ring member 8 corresponding to the plurality of vanes 5. One end of a lever 11 is rotatably supported by the other end of each link 9 via a center pin 10, and the other end of the lever 11 is fixed to an end of a support shaft 6. The ring member 8 is provided with a plate 12, and the plate 12 has a crank 13
A cylinder (not shown) is connected via. When the cylinder is driven, the ring member 8 is rotated with respect to the vane support 7 via the plate 12, and the rotation of the ring member 8 causes the support shaft 6 to be rotated via the link 9 and the lever 11. Thereby, each vane 5 rotates and the flow passage area of the exhaust gas inlet 3 becomes variable.

The end portion 14 of the center pin 10 connecting the link 9 and the lever 11 is mechanically caulked to make the lever 11 end.
The link 9 is rotatably supported on the outer periphery of the center pin 10. The gap between the link 9 and the center pin 10 is maintained in a predetermined state, and is set to a dimension that smoothly rotates with each other and does not cause friction.

[0006]

In the conventional variable displacement turbocharger, if the gap between the link 9 and the center pin 10 is too large, wear tends to occur, while if too small, it causes seizure. Therefore, the link 9 and the center pin 10
Is maintained with high precision, and is managed so that durability is not adversely affected. However, since the end portion 14 of the center pin 10 is mechanically fixed to the lever 11 by caulking, as shown in FIG.
4 has some bulge. The bulge of the end portion 14 of the center pin 10 affects the gap between the center pin 10 and the link 9, and when the bulge increases, the link 9 and the center pin 1
The movement between 0 and 0 is adversely affected. But center pin 1
Since 0 is fixed to the lever 11 by caulking,
Since the bulge of the end portion 14 is not constant, it is difficult to manage the gap between the link 9 and the center pin 10.

The present invention has been made in view of the above circumstances, and provides a variable capacity supercharger which does not affect the gap between the link and the rotation center axis even if the rotation center axis of the link bulges. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the present invention has a large number of vanes rotatable about a support axis in the circumferential direction of an annular support body arranged in a fluid inflow portion. A lever is fixed to each of the support shafts of the vanes, and one end of a link is rotatably supported at the other end of each lever, and is rotatable relative to the support body. A ring member is provided on the support, one end of the link is rotatably supported by the ring member, and the vane is rotated by the rotation of the ring member with respect to the support to inflow the fluid inflow portion. In the variable capacity supercharger of which the area is changed, an annular member is provided at an end of the rotation center shaft of the link.

By rotating the ring member, each vane rotates via the link and the lever, and the inflow area of the fluid inflow portion changes. A lever is attached to the end of the rotation center axis of the link, but if the rotation center axis of the lever mounting part has a bulge, the ring member faces the bulge and the rotation center of the link The bulge of the shaft has no effect.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a main part of a variable capacity supercharger according to an embodiment of the present invention, and FIG. 2 is a line II-II in FIG.
3 is a view taken along the line III-III in FIG. 1, and FIG. 4 is a detailed view of an arrow IV in FIG.

As shown in the drawing, an exhaust gas passage 22 as a fluid inflow portion is formed in the casing 21, and a turbine impeller 24 is provided facing the exhaust gas inlet 23. A large number of vanes 25 are arranged in the exhaust gas inlet 23 in the circumferential direction, and a support shaft 26 of each vane 25 is rotatably supported by a vane support 27. By rotating the vane 25 via the support shaft 26, the flow passage area of the exhaust gas inlet 23 is made variable. The exhaust gas introduced through an exhaust pipe (not shown) is accelerated by the vanes 25 through the exhaust gas passage 22 and drives the turbine impeller 24.

A ring member 28 is rotatably supported by the vane support 27, and one end of a link 29 is rotatably supported by the ring member 28 corresponding to a number of vanes 25. One end of a lever 31 is rotatably supported on the other end of each link 29 via a center pin 30 as a rotation center shaft, and the other end of the lever 31 is fixed to an end of a support shaft 26. . A plate 32 is attached to the ring member 28.
Is provided, and a cylinder is connected to the plate 32 via a crank. The ring member 28 is rotated with respect to the vane support 27 via the plate 32 by driving the cylinder, and the link 29 is rotated by the rotation of the ring member 28.
Also, the respective support shafts 26 rotate via the levers 31. As a result, each vane 25 rotates and the flow passage area of the exhaust gas inlet 23 becomes variable.

The end 33 of the center pin 30 is fixed to the lever 31 by mechanical caulking, and the link 29 is rotatably supported on the outer periphery of the center pin 30. This allows
The other end of the link 29 is rotatably supported by one end of a lever 31 via a center pin 30. Since the end 33 of the center pin 30 is fixed to the lever 31 by caulking, the end 33 has a bulge. An annular member 35 is provided at a portion facing the end 33 of the center pin 30.
And the link 29 is not supported at the position of the end 33 of the center pin 30. For this reason, the link 29 is not affected by the bulge of the center pin 30, and is rotatably supported by the center pin 30 in a state where it is always controlled to have the same clearance.

In the variable capacity supercharger described above, the center pin 3
The bulge generated when the end portion 0 of 0 is fixed to the lever 31 by caulking is received by the annular member 35. Therefore, the bulge due to the uncontrollable caulking is link 2
No effect on the rotation of 9
It is possible to maintain the clearance between the center pin 30 and the center pin 30 with high accuracy. Since the variable displacement supercharger is provided with a large number of links 29, if a defect such as seizure occurs between the link 29 and the center pin 30, even if only one link 29 is used, the entire variable displacement supercharger will fail. In the variable displacement supercharger described above, the gap between the link 29 and the center pin 30 can be maintained with high accuracy, so that there is no problem in relative rotation between the link 29 and the lever 31, and the variable displacement supercharger The durability of the machine is significantly improved.

[0015]

According to the variable capacity supercharger of the present invention, one end of the link is rotatably supported by the ring member, and the vane is rotated by the rotation of the ring member with respect to the support body to inflow area of the fluid inflow portion. In the variable displacement supercharger that changes the, the ring member is provided at the end of the rotation center axis of the link, so even if the end of the rotation center axis of the link has a bulge, the ring member will swell. The bulge of the rotation center axis does not affect the links facing each other. As a result, it is possible to maintain the clearance between the link and the rotation center shaft with high accuracy, and it is possible to improve durability without causing a malfunction in the operation of the link.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a variable displacement supercharger according to an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view taken along the line III-III in FIG. 1;

FIG. 4 is a detailed view of an arrow IV portion in FIG.

FIG. 5 is a cross-sectional view of a main part of a conventional variable capacity supercharger.

FIG. 6 is a detailed view of a center pin end portion.

[Explanation of symbols]

 21 turbine casing 22 exhaust gas passage 23 exhaust gas inlet 24 turbine impeller 25 vane 26 support shaft 27 vane support 28 ring member 29 link 30 center pin 31 lever 32 plate 33 end 35 annular member

Claims (1)

[Claims] 1. A plurality of vanes rotatable about a support axis are provided in a circumferential direction of an annular support body arranged in a fluid inflow portion, and one end of a lever is fixed to each support shaft of the vane. Along with the other end of each lever, one end of the link is rotatably supported, and a ring member that is relatively rotatable with respect to the support is provided on the support.
A variable capacity supercharger in which one end of the link is rotatably supported by the ring member, and the vane is rotated by the rotation of the ring member with respect to the support body to change the inflow area of the fluid inflow portion. A variable capacity supercharger, characterized in that an annular member is provided at an end of a rotation center shaft of the link.