JPH11132048A - Variable capacity type supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce resistance force acting on a rotational ring and to prevent abrasion and creep deformation of a contact surface between a link plate and a notch, by placing a rotational ring provided with a notch engaging with a link plate around its rotation shaft, and by providing three projections on the outer surface of the rotational ring. SOLUTION: A link plate 3 for giving torque is mounted to a rotation shaft 2 of a movable nozzle vane 1, a rotational ring 4 provided with a notch engaging with this link plate 3 is placed so as to cover the rotation shaft 2, and projections are formed at three positions on the outer peripheral surface of the rotational ring 4. When counterclockwise force orthogonal to the projections is acted on the rotational ring 4, the rotational ring 4 moves in the load direction, the projections collide against the inner peripheral surface 7 of the casing, moment in the load direction acts to the rotational ring 4. But, when angle of each projection is larger than 90 deg., only force formed by subtracting inertia force from frictional force on a contact surface acts to the ring. Thus, abrasion and creep deformation of a contact surface between the link plate 3 and the notch are restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a variable-capacity supercharger, and more particularly to a turbocharger suitable for an automobile.

[0002]

2. Description of the Related Art In a conventional structure, when a movable nozzle vane rotates, relative slip occurs due to a difference between a rotation radius r of a link plate and a rotation radius R of a rotary ring. If the relative slip is restricted, a required rotation angle of the movable nozzle vane cannot be obtained. Therefore, a certain amount of clearance, that is, a clearance is required in the notch portions of the link plate and the rotating ring. Also, clearance is required to insert the link plate into the notch of the rotating ring.
Further, the movable nozzle vane receives a temperature change from room temperature to about 800 ° C. (the maximum temperature varies depending on the type of automobile).

For this reason, the clearance changes with time due to the difference in thermal expansion between the link plate and the rotary ring. As a result, the presence of the clearance increases the impact force when the movable nozzle vane rotates. Accordingly, the force with which the rotating ring collides with the inner peripheral surface of the casing also increases. Therefore, the frictional force of the collision surface increases, and there is a problem in that the notch portions of the link plate and the rotating ring are worn and creep deformation is problematic.

[0004] To avoid this, i) the relative slip is suppressed by using a link mechanism. Alternatively, Japanese Utility Model Application 57-180117
Ii) reduce the impact force by using a low-rigidity link plate. And other measures have been taken.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the resistance force acting on a rotating ring with a simple structure and to suppress wear and creep deformation of a contact surface between a link plate and a notch of the rotating ring. It is an object of the present invention to provide a variable-capacity supercharger capable of performing the above-described operations.

[0006]

In order to achieve the above object, the present invention relates to a variable displacement supercharger in which a plurality of movable nozzle vanes are provided in a scroll flow path to improve turbine efficiency. A link plate for applying a rotational force is attached to the rotating shaft, and a rotating ring provided with a notch for engaging with each link plate is arranged so as to surround each rotating shaft, and three rotating rings are provided on the outer peripheral surface of the rotating ring. The present invention provides a variable-capacity supercharger characterized by having a projection.

According to the present invention, in a variable displacement supercharger in which a plurality of movable nozzle vanes are provided in a scroll flow path to improve the efficiency of a turbine, a link plate for applying a rotational force to a rotating shaft of the movable nozzle vane is attached. A rotary ring provided with a notch for engaging with each link plate is arranged so as to surround each of the rotary shafts, and one of the rotary shafts of the movable nozzle vane also serves as a drive shaft of the rotary ring. Is provided.

According to the present invention, in a variable displacement supercharger in which a plurality of movable nozzle vanes are provided in a scroll flow path to improve the efficiency of a turbine, a link plate for applying a rotational force to a rotating shaft of the movable nozzle vane is attached. A rotating ring provided with a notch engaged with each of the link plates is arranged so as to surround each of the rotating shafts, three projections are provided on an outer peripheral surface of the rotating ring, and a rotating shaft of the movable nozzle vane is provided. One also serves as a drive shaft of the rotating ring, an angle formed between the drive shaft and one of the protrusions on the outer surface of the rotating ring is ± 15 degrees or less, and the other two protrusions of the driving shaft and the outer surface of the rotating ring. And a variable-capacity supercharger characterized by an angle of 90 degrees or more.

That is, with the above structure, when the rotating ring collides with the inner peripheral surface of the casing, a couple moment in the rotating direction acts due to the difference between the collision position and the position of the center of gravity of the rotating ring. It is possible to reduce the resistance of the contact surface between the inner peripheral surfaces.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a variable displacement supercharger to which the present invention is applied. The turbine 9 is mounted on the turbine shaft 8. A plurality of movable nozzle vanes 1 are arranged on the turbine intake side so as to surround the turbine 9. A link plate 3 for applying a rotational force is attached to the rotating shaft 2 of the movable nozzle vane 1, and a rotating ring 4 that engages with the link plate 3 is arranged so as to surround the rotating shaft 2. The rotation ring 4 has three projections on the outer peripheral surface as described later. One of the rotating shafts 2 of the movable nozzle vane 1 is extended in the axial direction,
A movable link mechanism 11 is provided therein, and the movable link mechanism 11 is moved using an air cylinder, a hydraulic cylinder, or the like.

FIG. 2 shows a main part of the first embodiment of the present invention. A link plate 3 for applying a rotational force to the rotary shaft 2 is attached to the rotary shaft 2 of the movable nozzle vane 1, and a rotary ring 4 provided with a notch 5 engaged with the link plate 3 is attached to the rotary shaft 2. The rotary ring 4 was disposed so as to surround it, and protrusions 6 were provided at three places on the outer peripheral surface of the rotating ring 4 as described later.

FIG. 3 shows the motion characteristics of the rotating ring according to the first embodiment of the present invention. In this embodiment, the protrusions 6a, 6b, 6c are provided at three equally spaced positions on the outer peripheral surface of the rotary ring 4. Now, when a counterclockwise force F acts on the rotating ring 4 at right angles to the projection 6a, the rotating ring 4 is a hollow disk and has no center of rotation.
Moves in the load direction and the projection 6b collides with the casing inner peripheral surface 7. Due to the difference between the collision position and the position of the center of gravity of the rotating ring 4, a moment M =
Fy (y is the distance between the collision position and the center of gravity) acts.

Here, if the angle between the projections 6a and 6b is 90 degrees, y = 0 and no moment acts on the rotating ring 4 (in this case, the existence of the projections becomes meaningless). When the angle between the projections 6a and 6b is 90 degrees or less, a moment acts on the rotating ring 4 in the direction opposite to the load.

That is, when the angle between the projections 6a and 6b is 90 degrees or less, the rotating ring 4 has an inertia of the rotating ring 4 in addition to the frictional force of the contact surface between the rotating ring 4 and the inner peripheral surface 7 of the casing. Resistance by force acts. Conversely, if the angle is 90
In the case of a degree or more, only a force obtained by subtracting the inertial force from the frictional force of the contact surface acts.

As a result, the resistance acting on the rotating ring can be greatly reduced.

[0017]

According to the present invention, the resistance acting on the rotating ring during rotation of the movable nozzle vane can be greatly reduced, so that the abrasion and creep deformation of the contact surface between the link plate and the notch of the rotating ring are suppressed. There is an effect that can be.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view showing a main part of FIG. 1;

FIG. 3 is an enlarged side sectional view of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Movable nozzle vane, 2 ... Rotary axis, 3 ... Link plate, 4
... Rotating ring, 5 ... Notch, 6 ... Protrusion, 7 ... Casing inner peripheral surface, 8 ... Turbine shaft, 9 ... Turbine, 10 ... Casing, 11 ... Movable link mechanism.

Claims (1)

[Claims] 1. A variable displacement supercharger having a plurality of movable nozzle vanes provided in a scroll flow path to improve the efficiency of a turbine, wherein a link plate for applying a rotational force to a rotating shaft of the movable nozzle vanes is attached, and A variable-capacity supercharger, wherein a rotary ring having a notch for engaging with each link plate is arranged so as to surround each of the rotary shafts, and three projections are provided on an outer peripheral surface of the rotary ring. Machine.