JP2000018046A - Turbocharger with variable nozzle vane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate any increase in the rotational resistance of a unison ring by avoiding the occurrence of wrench force in a space between this unison ring and a mounting member which rotatably attached the unison ring to a turbine housing. SOLUTION: A variable nozzle vane is installed in an exhaust passage extending to the side of a turbine wheel from a scroll chamber of an exhaust turbine, while a unison ring 9 for rotating a turning shaft 6 after engaging with a turning shaft arm 8 attached to this turning shaft 6 of a variable nozzle vane, is rotatably attached to a turbine housing, and the unison ring 9 is rotated by a plurality of actuator arms 11. Then, all joining points 12 lying between these plural actuator arms 11 and the unison ring 9 are set up at almost equal intervals in the circumferential direction of the unison ring 9, or almost point symmetry with a central axis of the unison ring 9, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turbocharger with a variable nozzle vane.

[0002]

2. Description of the Related Art Conventionally, an exhaust gas passage extending from a scroll chamber of an exhaust turbine toward a turbine wheel is provided.
A variable nozzle vane for restricting exhaust gas passing through the turbine wheel is provided, and a rotating shaft of the variable nozzle vane is rotatably supported by the turbine housing, and is engaged with a rotating shaft arm attached to the rotating shaft to rotate the rotating shaft. A turbocharger with a variable nozzle vane is known in which a unison ring is rotatably mounted on a turbine housing and the unison ring is rotated by a plurality of actuator arms. An example of this type of turbocharger with a variable nozzle vane is described in, for example, Japanese Utility Model Laid-Open Publication No. 61-157134.

FIG. 7 is a partial cross-sectional side view of a conventional turbocharger with a variable nozzle vane, and FIG.
FIG. 9 is a schematic view showing the arrangement of the joining points in FIG. 8 and the direction of the force applied to the joining points. 7 to 9, 1
Reference numeral 01 denotes an exhaust turbine, 102 denotes a scroll chamber of the exhaust turbine 101, 103 denotes a turbine wheel, and 104 denotes an exhaust gas passage extending from the scroll chamber 102 to the turbine wheel 103 side. 105 is an exhaust gas passage 104 for restricting exhaust gas passing through the turbine wheel 103.
A variable nozzle vane 106 provided therein is a rotating shaft of the variable nozzle vane 105. 107 is a turbine housing, 108 is a rotating shaft 106 of the variable nozzle vane 105
Is a unison ring rotatably mounted on the turbine housing 107 for engaging with the rotary shaft arm 108 to rotate the rotary shaft 106. Reference numeral 111 denotes an actuator arm for rotating the unison ring 109, and reference numeral 112 denotes a junction between the unison ring 109 and the actuator arm 111.

As shown in FIGS. 7 to 9, when the actuator arm 111 is operated and the unison ring 109 is rotated counterclockwise in FIG.
8. The rotating shaft 106 and the nozzle vane 105 are rotated counterclockwise in FIG. As a result, the turbine wheel 1
The degree of restriction of the exhaust passing through 03 is changed.

[0005]

However, as shown in detail in FIGS. 8 and 9, although the conventional turbocharger with a variable nozzle vane has a plurality of actuator arms 111, the actuator arm 111 and the unison ring 109 are provided. All junctions 112 between
Are not arranged at substantially equal intervals in the circumferential direction of the unison ring 109. Also, all joints 112 between the actuator arm 111 and the unison ring 109 are:
They are not arranged point-symmetrically with respect to the central axis O of the unison ring. Therefore, the resultant force of the force F acting on each joint point 112 does not become a force for rotating the unison ring 109 about the central axis O, and therefore, the unison ring 109 is rotatably attached to the turbine housing 107. A twisting force is generated between the mounting member and the unison ring 109, and the rotational resistance of the unison ring 109 is increased.

In view of the above problems, the present invention avoids the generation of a twisting force between an unison ring and a mounting member in which the unison ring is rotatably mounted to a turbine housing. An object of the present invention is to provide a turbocharger with a variable nozzle vane that can prevent an increase in rotational resistance.

[0007]

According to the first aspect of the present invention, an exhaust gas passing through the turbine wheel is throttled into an exhaust gas passage extending from a scroll chamber of the exhaust turbine toward the turbine wheel. A variable nozzle vane is provided, a rotating shaft of the variable nozzle vane is rotatably supported with respect to the turbine housing, and a unison ring for rotating the rotating shaft by engaging with a rotating shaft arm attached to the rotating shaft is provided. A turbocharger with a variable nozzle vane rotatably mounted on the turbine housing and wherein the unison ring is rotated by a plurality of actuator arms, wherein all junctions between the plurality of actuator arms and the unison ring are Are arranged at substantially equal intervals in the circumferential direction of the unison ring. Variable nozzle vane turbocharger is provided, characterized in that the.

In the turbocharger with a variable nozzle vane according to the first aspect, all the joints between the plurality of actuator arms and the unison ring are arranged at substantially equal intervals in the circumferential direction of the unison ring, so that the action is applied to each joint. The resultant force constitutes only the force for rotating the unison ring about the central axis of the unison ring. Therefore, it is possible to prevent a twisting force from being generated between the unison ring and a mounting member in which the unison ring is rotatably mounted to the turbine housing, and it is possible to prevent an increase in rotational resistance of the unison ring.

According to the second aspect of the present invention, a variable nozzle vane for restricting exhaust gas passing through the turbine wheel is provided in an exhaust gas passage extending from the scroll chamber of the exhaust turbine toward the turbine wheel, A rotating shaft of the variable nozzle vane is rotatably supported with respect to the turbine housing, and a unison ring for rotating the rotating shaft by engaging with a rotating shaft arm attached to the rotating shaft is provided with respect to the turbine housing. In a turbocharger with a variable nozzle vane rotatably mounted and the unison ring being rotated by a plurality of actuator arms, all joints between the plurality of actuator arms and the unison ring are centered on the unison ring. That they are almost point-symmetrical about the axis. Variable nozzle vane turbocharger is provided to symptoms.

In the turbocharger with a variable nozzle vane according to the present invention, all the joints between the plurality of actuator arms and the unison ring are arranged substantially point-symmetric with respect to the central axis of the unison ring. Of the forces acting on the unison ring constitutes only a force for rotating the unison ring about the central axis of the unison ring, that is, only a couple. Therefore, it is possible to prevent a twisting force from being generated between the unison ring and a mounting member in which the unison ring is rotatably mounted to the turbine housing, and it is possible to prevent an increase in rotational resistance of the unison ring.

[0011]

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

FIG. 1 is a partial cross-sectional side view of a turbocharger with a variable nozzle vane according to a first embodiment of the present invention viewed from the axial direction of a turbine wheel. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 is a cross-sectional view taken along the line III-III, and FIG. 4 is a schematic configuration diagram showing the arrangement of the joint points in FIG. 1 to 4, reference numeral 1 denotes an exhaust turbine, 2 denotes a scroll chamber of the exhaust turbine 1, 3 denotes a turbine wheel, and 4 denotes an exhaust gas passage extending from the scroll chamber 2 to the turbine wheel 3 side. 5 is a variable nozzle vane provided in the exhaust gas passage 4 for restricting exhaust gas passing through the turbine wheel 3, and 6 is a variable nozzle vane supported by a turbine housing or a plate or the like (not shown) attached to the turbine housing. This is the rotation axis of the nozzle vane. 7 is a turbine housing, 8 is a rotating shaft arm attached to the rotating shaft 6 of the variable nozzle vane 5, 9
Is directly rotatable with respect to the turbine housing 7 to rotate the rotary shaft 6 by engaging with the rotary shaft arm 8 or indirectly to the turbine housing 7 via a plate or the like (not shown). It is a unison ring that is mounted on the ground. Reference numeral 11 denotes an actuator arm for rotating the unison ring 9, and reference numeral 12 denotes a junction between the unison ring 9 and the actuator arm 11.

As shown in FIGS. 1 to 4, when the actuator arm 11 is operated and the unison ring 9 is rotated counterclockwise in FIG. 1, the rotating shaft arm 8 and the rotating shaft 6 are rotated.
And the nozzle vane 5 is rotated counterclockwise in FIG. As a result, the degree of restriction of exhaust gas passing through the turbine wheel 3 is changed.

Further, as shown in detail in FIGS. 1, 2 and 4, the turbocharger with a variable nozzle vane according to the present embodiment has a plurality of actuator arms 11 and a space between the actuator arm 11 and the unison ring 9. Are arranged at regular intervals of about 120 ° in the circumferential direction of the unison ring 9. Therefore, unlike the conventional turbocharger with a variable nozzle vane, the force F acting on each joint 12 constitutes only the force for rotating the unison ring 9 about the central axis O of the unison ring. Therefore, it is possible to prevent a twisting force from being generated between the unison ring 9 and an attachment member such as the roller 10 that rotatably attaches the unison ring 9 to the turbine housing 7, and the rotation of the unison ring 9 can be prevented. An increase in resistance can be prevented.

FIG. 5 is a schematic structural view similar to FIG. 4 of a second embodiment of the turbocharger with a variable nozzle vane of the present invention. In FIG. 5, the same components or parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. This embodiment is different from the first embodiment only in the arrangement of the joining points and the direction of the force applied to the joining points, and the other parts (not shown) are the same as in the first embodiment.
As in the case of the first embodiment, when the actuator arm is operated to rotate the unison ring, the rotating shaft arm, the rotating shaft, and the nozzle vane are rotated in the same direction as the unison ring. As a result, the degree of restriction of exhaust gas passing through the turbine wheel is changed.

As shown in FIG. 5, in the turbocharger with a variable nozzle vane of the present embodiment, all the joint points 12 between the actuator arm and the unison ring 9 are
They are arranged almost point-symmetrically with respect to the central axis O of the unison ring. Therefore, unlike the conventional turbocharger with a variable nozzle vane, the force F acting on each joint 12 constitutes only a force for rotating the unison ring 9 about the central axis O of the unison ring, that is, only a couple. Therefore, a mounting member in which the unison ring 9 is rotatably mounted on the turbine housing, and the unison ring 9
The generation of a prying force between the unison ring 9 and the rotation resistance of the unison ring 9 can be prevented.

FIG. 6 is a schematic structural view similar to FIG. 4 of a third embodiment of the turbocharger with a variable nozzle vane of the present invention. 6, the same components or parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. This embodiment is different from the first embodiment only in the arrangement of the joining points and the direction of the force applied to the joining points, and the other parts (not shown) are the same as in the first embodiment.
As in the case of the first embodiment, when the actuator arm is operated to rotate the unison ring, the rotating shaft arm, the rotating shaft, and the nozzle vane are rotated in the same direction as the unison ring. As a result, the degree of restriction of exhaust gas passing through the turbine wheel is changed.

As shown in FIG. 6, in the turbocharger with a variable nozzle vane of the present embodiment, all the joint points 12 between the actuator arm and the unison ring 9 are
At the same time, they are arranged at equal intervals of approximately 45 ° in the circumferential direction of the unison ring 9 and at the same time, they are arranged almost point-symmetrically with respect to the central axis O of the unison ring. Therefore, unlike the conventional turbocharger with a variable nozzle vane, the force F acting on each joint 12 constitutes only a force for rotating the unison ring 9 about the central axis O of the unison ring, that is, only a couple. Therefore, Unison Ring 9
The generation of a twisting force between the unison ring 9 and a mounting member rotatably mounted on the turbine housing can be avoided, and an increase in rotational resistance of the unison ring 9 can be prevented.

In the above-described embodiment, three, four, or eight junctions are provided between the actuator arm and the unison ring. In other embodiments, a plurality of actuator arms and the unison ring are provided. If all the joint points between them are arranged at substantially equal intervals in the circumferential direction of the unison ring, or are arranged almost point-symmetric with respect to the central axis of the unison ring, It is possible to provide as many as.

[0020]

According to the present invention, it is possible to prevent a twisting force from being generated between the unison ring and a mounting member in which the unison ring is rotatably mounted to the turbine housing, so that the rotation resistance of the unison ring is reduced. Can be prevented from increasing.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a turbocharger with a variable nozzle vane according to a first embodiment of the present invention as viewed from an axial direction of a turbine wheel.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a schematic configuration diagram showing an arrangement of joint points in FIG. 1 and directions of forces applied to the joint points.

FIG. 5 is a schematic configuration diagram similar to FIG. 4 of a second embodiment of the turbocharger with a variable nozzle vane of the present invention.

FIG. 6 is a schematic configuration diagram similar to FIG. 4 of a third embodiment of the turbocharger with a variable nozzle vane of the present invention.

FIG. 7 is a partial cross-sectional side view of a conventional turbocharger with a variable nozzle vane.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a schematic diagram showing the arrangement of the joint points in FIG. 8 and the directions of forces applied to the joint points.

[Explanation of symbols]

 6: Rotating shaft of variable nozzle vane 8: Rotating shaft arm 9: Unison ring 11: Actuator arm 12: Joining point

Claims (2)

[Claims] 1. A variable nozzle vane for restricting exhaust gas passing through the turbine wheel is provided in an exhaust gas passage extending from a scroll chamber of the exhaust turbine to a turbine wheel side, and a rotary shaft of the variable nozzle vane has a turbine housing. A unison ring rotatably supported with respect to the rotating shaft and rotating the rotating shaft by engaging with a rotating shaft arm attached to the rotating shaft; rotatably mounted on the turbine housing; In a turbocharger with a variable nozzle vane in which the ring is rotated by a plurality of actuator arms,
A turbocharger with a variable nozzle vane, wherein all joining points between the plurality of actuator arms and the unison ring are arranged at substantially equal intervals in a circumferential direction of the unison ring. 2. A variable nozzle vane for restricting exhaust gas passing through the turbine wheel is provided in an exhaust gas passage extending from a scroll chamber of the exhaust turbine to a turbine wheel side, and a rotating shaft of the variable nozzle vane has a turbine housing. A unison ring rotatably supported with respect to the rotating shaft and rotating the rotating shaft by engaging with a rotating shaft arm attached to the rotating shaft; rotatably mounted on the turbine housing; In a turbocharger with a variable nozzle vane in which the ring is rotated by a plurality of actuator arms,
A turbocharger with a variable nozzle vane, wherein all joints between the plurality of actuator arms and the unison ring are arranged substantially point-symmetrically with respect to a central axis of the unison ring.