JPH06185371A - Variable capacity supercharger - Google Patents

Abstract

PURPOSE:To prevent the wear of the connecting parts of a connecting plate for adjusting the throat between nozzle vanes and pins. CONSTITUTION:A plurality of nozzle vanes 12 are arranged on the outer circumference of a turbine disc. One end part of a link plate 14 is connected to each nozzle vane 12. The space between the other end parts of adjacent link plates 14 is connected by a connecting plate 15 by means of pins 16. It is so contrived that the throat S between the nozzle vanes 12 can be regulated by moving the connecting plates 15 in the circumferential direction. The connecting plate 15 is made up of ring-shaped parts 20 at both ends where the pin holes 22 are provided, and an arm part 21 arranged between both the ring-shaped parts 20. The arm part 21 is sloped with regard to the straight line connecting the centers of the pin holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacity supercharger capable of adjusting the flow rate of introduced gas.

[0002]

2. Description of the Related Art A variable capacity supercharger having a turbine casing, which has a plurality of nozzle vanes incorporated therein and adjusts a gas flow rate introduced into a turbine by changing a throat between the nozzle vanes, has been conventionally adopted. However, there is a configuration shown in FIGS. 6 and 7 as an example. That is, the turbine casing 1 and the blower casing 2 are integrated with each other through the bearing casing 3, and the turbine impeller 4 inside the turbine casing 1 and the blower fan 5 inside the blower casing 2 are
A turbine shaft 6 rotatably supported in a bearing casing 3 by a bearing 7 is connected, and a turbine impeller 4 is rotated by a gas flow to rotate a blower fan 5 to absorb and compress air. The gas for discharging and further for rotating the turbine impeller 4 is introduced from the gas inlet 8 and guided to the turbine impeller 4 through the scroll 10 provided on the outer circumference of the turbine shroud 9 so as to form a gas passage. In the configuration described above, a plurality of nozzle vanes 12 are arranged in the circumferential direction in the gas flow passage 11 portion between the scroll 10 portion and the outer peripheral portion of the turbine impeller 4, and each nozzle vane 12 is connected to the turbine shroud 9 Are fixed to the inner ends of the shafts 13 which are penetrated. On the other hand, at the outer end of each shaft 13,
One end of each of the link 14 plates is attached, and the other end of each of the adjacent link plates 14 is connected by a pin 16 in the circumferential direction by a connecting plate 15 such as a chain link arranged outside the turbine shroud 9, Connecting plate 15 via lever 19, shaft 17, and arm 18 by an actuator (not shown)
By moving the link in the circumferential direction, the link plate 14, the shaft 13
The opening / closing angle of each nozzle vane 12 can be changed by rotating the nozzle vane 12, and the opening / closing angle of each nozzle vane 12 is controlled to adjust the throat S between the nozzle vanes 12 to a wide range or a small flow rate. It is designed so that it can be changed.

[0003]

However, in the case of the conventional variable displacement supercharger described above, pulsating pressure is generated between the nozzle vanes 12 by the exhaust gas from the engine, and the pulsating pressure is generated from the nozzle vanes 12 to the link plate 14. Since it is transmitted to the connecting plate 15 via the pins 16, there is a problem that abnormal wear occurs between the connecting plate 15 and the pins 16. That is, the pulsating pressure transmitted to the connecting plate 15 acts so as to vibrate the connecting plate 15 in the circumferential direction, so that the pin hole of the connecting plate 15 and the pin 16 are repeatedly hit at one point to cause the fretting. Causes abnormal wear such as ting wear. Especially, since the link plate 14 and the connecting plate 15 are moved without lubrication at high temperature, the above problem is remarkable.

Therefore, according to the present invention, a single point local collision does not occur between the pin hole of the connecting plate and the pin so that abnormal wear does not occur at the connecting part between the connecting plate and the pin. Is what you are trying to do.

[0005]

In order to solve the above-mentioned problems, the present invention connects one end of a link plate to each of a plurality of nozzle vanes arranged on the outer periphery of a turbine impeller in a turbine casing, and The other ends of the adjacent link plates are pin-connected in the circumferential direction by a connecting plate, and the displacement in the circumferential direction of the connecting plate is transmitted to each nozzle vane via the link plate so that the throat between the nozzle vanes is adjusted. In the variable displacement supercharger, the connecting plate is composed of an annular part at both ends provided with pin holes and an arm part integrally connecting the annular parts, and a straight line connecting the centers of both pin holes. The arm part is appropriately inclined with respect to the above.

[0006]

[Operation] Since the connecting plate for connecting the link plates connected to the respective nozzle vanes has a shape in which the arm portion is inclined with respect to the straight line connecting the pin hole centers of the annular portion, pulsation generated between the nozzle vanes Even if the vibration is transmitted to the connecting plate in the circumferential direction, the collision force between the pin hole of the connecting plate and the pin is dispersed around the pin, and further, the connecting plate is elastically deformed. In addition, no one point local repeated collision force is applied, and abnormal wear is prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, and like the ones shown in FIGS. 6 and 7, a plurality of nozzle vanes arranged on the outer periphery of the turbine impeller 4 in the turbine casing 1. 12, one end of each link plate 14 is connected to each other, and the other ends of the adjacent link plates 14 are connected in the circumferential direction by the connecting plate 15 using the pin 16 to move the connecting plate 15 in the circumferential direction. Each nozzle vane 12 through the link plate 14
In the variable displacement supercharger in which the flow rate of the gas introduced from the engine is adjusted by adjusting the throat S between the nozzle vanes 12 to a wide range by transmitting the above to the connecting plate 15 shown in FIG. As shown in an enlarged manner, it is constituted by an annular portion 20 provided with pin holes 22 at both ends and an arm portion 21 integrally connecting the annular portions 20, and a straight line connecting the centers O of the both pin holes 22. The axial center line (longitudinal center line) B of the arm portion 21 relative to A is appropriately angled α
It is configured to be inclined.

The inclination angle α of the arm portion 21 is determined by the pin 16
When the clearance between the pin hole 22 and the pin hole 22 is a, and the perpendicular distance from the center O of the pin hole 22 to the longitudinal center line B of the arm portion 21 is b, the relation b> 2a is selected. .

When pulsation is generated between the nozzle vanes 12, and the pulsation is transmitted as vibration in the circumferential direction from the nozzle vanes 12 to the connecting plate 15 via the link plate 14 and the pin 16, conventionally, the connecting plate 15 and the pin 16 are separated from each other. Although a one-point local collision force acts on the connecting portion, in the present invention, the connecting plate 1
The shape of 5 is a straight line A connecting the pin hole centers O of the annular portion 20.
On the other hand, since the arm portion 21 is inclined, the one-point local collision force is buffered and relaxed.

That is, in the case of the present invention, the connecting plate 15 is
Since the longitudinal center line B of the arm portion 21 that integrally connects the annular portions 20 is inclined with respect to the straight line A that connects the pin hole centers O of the annular portion 20, vibration due to pulsation occurs. However, when the force is transmitted from one annular portion 20 to the other annular portion 20 via the arm portion 21, the transmission of the force such as twisting (rotating) the entire connecting plate 15 about the center of gravity G is performed. Will be carried out, which results in pin holes 22
The collision force between the pin 16 and the pin 16 is dispersed around the pin 16. Further, since the arm portion 21 is inclined, when the above-mentioned twisting force is generated, the connecting plate 15 is elastically deformed between the annular portions 20. Therefore, the connecting plate 1
A single point local repeated collision force does not act on the connecting portion between the pin 5 and the pin 16, and abnormal wear is prevented from occurring.

Incidentally, when the wear amounts of the pin connecting portions of the supercharger of the present invention and the conventional supercharger are compared with each other with time, as shown in FIG. The result is that the wear amount is about 1/3 of that of the curve B of the conventional example.

The present invention is not limited to the above embodiment, and the connecting plate 15 may be S-shaped as shown in FIG. 4, and other points of the present invention will be described. It goes without saying that various changes can be made without departing from the scope.

[0014]

As described above, according to the variable capacity supercharger of the present invention, the connecting plate for connecting the link plates connected to the nozzle vanes in the circumferential direction with the connecting plate is provided between the centers of the pin holes of the annular portion. Since the arm part is inclined with respect to the straight line connecting the connecting lines, even if the pulsation between the nozzle vanes is transmitted to the connecting plate as circumferential vibration, the collision force between the pin hole of the connecting plate and the pin is moved around the pin. In addition to being able to disperse, the connecting plate can be elastically deformed, whereby the collision force that is about to be locally applied to the connecting part between the connecting plate and the pin can be buffered and relaxed, and abnormal wear can be prevented. It has an excellent effect that it can be prevented from occurring.

[Brief description of drawings]

FIG. 1 is a partial schematic view showing an embodiment of a variable displacement supercharger of the present invention.

FIG. 2 is a plan view showing a part of FIG. 1 cut away.

FIG. 3 is an enlarged view of a connecting plate.

FIG. 4 is an enlarged view showing another example of the connecting plate.

FIG. 5 is a diagram showing an experimental result comparing the amount of wear of a pin connecting portion between the present invention and a conventional example.

FIG. 6 is a schematic diagram showing an example of a conventional variable displacement supercharger.

FIG. 7 is a view on arrow VII in FIG.

[Explanation of symbols]

 1 Turbine Cabin 4 Turbine Impeller 12 Nozzle Vane 14 Link Plate 15 Connecting Plate 16 Pin 20 Annular Part 21 Arm Part 22 Pin Hole S Throat O Center A Straight Line α Inclination Angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Mori, 1-1-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center

Claims (1)

[Claims] 1. A plurality of nozzle vanes arranged on the outer periphery of a turbine impeller in a turbine casing are connected to respective one ends of link plates, and the other end of each adjacent link plate is circumferentially connected by a connecting plate. In a variable displacement supercharger in which pins are connected and the displacement in the circumferential direction of the connecting plate is transmitted to each nozzle vane via a link plate, the throat between the nozzle vanes is adjusted. It is configured to include an annular portion at both ends provided with holes and an arm portion integrally connecting the annular portions, and the arm portion is appropriately inclined with respect to a straight line connecting the centers of both pin holes. A characteristic variable capacity supercharger.