JPS63143320A - Movable vane driving mechanism of turbocharger - Google Patents

Abstract

PURPOSE:To forcedly return the whole movable vanes to a totally closed position by providing a link which is interlocked with an opening/closing link mechanism and rotatably installing said link and a movable member so as to rotate when a force more than a defined value is applied. CONSTITUTION:By reciprocating a movable member 47 by means of an actuator 45, plural movable vanes 37 are opened and closed via links 73, 79 and opening/ closing link mechanisms 51. In this case, the end part 47A of the movable member 47 is joined to the first link 73 in such a way that a nut 83 is welded to a screw 81 under a defined frictional force applied by the resilient force of a coned disk spring 85, and that the end part 47A of the movable member 47 and the first link 73 are rotated when a defined force is applied. Thereby, when necessary, the movable member 47 is advanced swinging the first link 73, to operate one opening/closing link mechanism 51 causing one movable vane 37 to be totally closed forcedly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a movable vane drive mechanism for a turbocharger.

(Problems to be Solved by the Prior Art and the Invention) A plurality of movable vanes of a variable capacity turbine that change the flow path area of an exhaust flow path in a turbine housing, and two movable vanes corresponding to the plurality of movable vanes. The movable vane drive of a turbocharger is provided with an opening/closing link mechanism that opens and closes the corresponding movable vane, and a movable member that is connected to an actuator and reciprocates to operate the two sets of opening/closing link mechanisms. Even if the vane drive mechanism is assembled correctly, when the exhaust temperature rises due to engine startup, the movable vane drive mechanism will be affected by the heat, and for example, the distance between the spindles that make up the opening/closing link mechanism will change. It is difficult for all the movable vanes to return to the fully closed position, and it is difficult to uniformly open and close all the movable vanes.

Therefore, a method such as inserting a compensating coil spring into the member connecting the arms of each opening/closing link mechanism may be considered.
With such a structure, spring adjustment is troublesome and cannot be easily assembled.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to be able to return all movable vanes to the fully closed position even if they are affected by heat; To provide a movable vane drive mechanism for a turbocharger that can be easily assembled.

(Means for Solving the Problems) In order to achieve the above object, the present invention extends in a direction intersecting the reciprocating direction of the movable member, and has both ends attached to arms constituting each of the two sets of opening/closing link mechanisms. A link is provided that connects the two sets of opening/closing link mechanisms to operate the two sets of opening/closing link mechanisms, and the intermediate portion of the link and the movable member are pivoted so as to be rotatable when a force of a predetermined value or more is applied.

(Function) The movable member (47) is activated by the actuator (45).
, link (73), opening/closing link mechanism (51), (5
1), a plurality of movable vanes (37), . . . are opened and closed regularly.

When the movable vanes (37), (37) that are operated to open and close by one of the two sets of opening/closing link mechanisms (51), (51) reach the fully closed position, and the other one opens/closes. When the movable vanes (37), (37) that are opened and closed by the link mechanism (51) have not reached the fully closed position, the link (73) and the movable member (47) move relative to each other at the joint, and the link (73) swings to operate the other opening/closing link mechanism (51), bringing the movable vanes (37), (37), which have not reached the closed position, to the fully closed position.

(Example) Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a longitudinal sectional view of the turbocharger, Fig. 2 is a sectional view taken along line 11-II in Fig. 1, Fig. 3 is a detailed view of the movable vane drive mechanism, Fig. 4 is a schematic side view of the opening/closing link mechanism, Fifth
The figure shows a sectional view taken along the line V-V in FIG. 4.

(1) is a turbocharger, (3) is a compressor housing, (5) is a turbine housing, and (7) is a center housing. The compressor housing (3) has an axial integral passageway (9) communicating with the carburetor side. , a scroll passage (11) communicating with the combustion chamber side of the engine is formed, and a compressor impeller (13) is disposed in a communicating portion between the axial passage (9) and the center of the scroll passage (11).

A scroll passage (15) connected to the combustion chamber side of the engine and an axial passage (17) on the exhaust discharge side are formed in the turbine housing (5), and the center of the scroll passage (15) and the axial passage (17) A turbine wheel (19) is disposed in the communicating portion.

Compressor impeller (13) and turbine wheel (1
The shaft (21) that connects the center housing (
7) is rotatably supported by the float bearings (23) and (23) inside the float bearings (23) and (23).
(23) is supplied with lubricating oil from the oil supply passage (25) to lubricate and cool the float bearings (23) and (23), and then drained through the oil drain passage (27).
) indicates a water jacket.

The tarping housing (5) has a top plate (
31) and a vane holding member (33) are incorporated, and a heat shield plate (35) is interposed at the joint portion between the tarping housing (5) and the center housing (7).

The top plate (31) includes a cylindrical portion (31A) and a disk portion (31B), and the vane holding member (33) expands in the axial direction from the disk portion (33A) and the outer periphery of the disk portion (33A). It is equipped with four fixed vanes (33B,) that extend out.

The cylindrical portion (31A) of the top plate (31) constitutes the base of the axial passage (17), and the disc portion (31B) of the top plate (31) and the vane holding member (3
3) constitutes the inner circumference portion of the scroll passage (work 5).

The fixed vane (33B) has a partially arcuate shape as shown in FIG.
9) and are arranged concentrically at equal intervals in the circumferential direction.

A movable vane (37) is provided between each of the four fixed vanes (33B).

The movable vane (37) has a partially arcuate shape, and as shown in FIG. 4, the movable vane (37) has a base ( 37A)
be fixed and placed. The movable vane (37) is attached to the support shaft (39
), the tapered tip (37B) of the movable vane (37) and the tapered base (33G) of the fixed vane (33B) corresponding to this tip (37B) are opened and closed by rotating the movable vane (37).
The flow rate of the exhaust gas hitting the compressor impeller (19) is adjusted by changing the flow path area of the exhaust flow path (41) defined by the compressor impeller (19).

The position of the movable vane (37) shown in FIG. 2 indicates the fully closed position where the area of the exhaust flow path (41) is the most narrowed, and the fully closed position of the movable vane (37) is the position of the movable vane (37) outside the movable vane (37). This is determined by the side surface coming into contact with the notch (43) on the outer periphery of the disc portion (33A) of the vane holding member (33).

As shown in FIG. 3, the movable vane (37) is opened and closed by an actuator (45) that operates according to the rotational speed of the engine, etc., and by the operation of the actuator (45) that is connected to the actuator (45). A movable member (47) that reciprocates approximately linearly, a first link (73) connected to the movable member (47), and a second link (79) connected to the first link (73); This is performed by an opening/closing link mechanism (51) connected to the first and second links (73) and (79), respectively, which opens and closes each movable vane (37).

The opening/closing link mechanism (51) has four movable vanes (37
), and each opening/closing link mechanism (51) opens and closes the two movable vanes (37), (37), and the opening/closing link mechanism (51), (51)
As shown in the figure, the heat shield plate (35) and center housing (7)
) and the left and right spatial parts (53) and (53)
be installed respectively.

The opening/closing link mechanism (51) includes movable vane support shafts (39) protruding from the bearing portion (35A) of the heat shield plate (35);
Arm (55) fixed to the end of (39>), (5
5), the intermediate part is fixed to the support shaft (61) which is rotatably supported by the bearing part (7A) of the center housing (7), the bearing (57), and the sealing material (59), and both ends are attached to each of the arms ( 55), long groove (63) and pin (65) in (55)
), and an arm (69) fixed to an end of the support shaft (61) protruding from the bearing portion (7A) of the center housing (7).
It consists of

The first link (73) has one end pivotally connected to the arm (69) on the side remote from the actuator (45) via a shaft (71), and the second link (79)
One end is pivotally connected to the arm (69) on the side closer to 5) via the shaft (45), and the first and second links (73), (79)
The other end is pivotally connected via a shaft (77) and is connected to the first link (
73) extends in a direction intersecting the reciprocating direction of the movable member (47).

The movable member (47) has its tip (47A) connected to the first link (
73).

As shown in FIG. 6, the first link (73) and the movable member tip (47A) are connected by a screw (81) inserted through the first link (73) and the movable member tip (47A). A nut (83) is screwed onto the nut (83), and a disc spring (85) interposed between the screw (81) head and the movable member tip (47A) is screwed onto the nut (83).
), and by applying a predetermined frictional force between the movable member tip (47A) and the first link (73) by the elastic force of the disc spring (85), the nut (83) is welded to the screw (81). Then, a predetermined force is applied to the movable member tip (47A) and the first link (
73), the movable member tip (47A) and the first link (73) are coupled so as to be rotatable about the screw (81).

Then, the movable member (
47) to open and close the four movable vanes (37) through the first link (73), second link (79), opening/closing link mechanism (51), (51), and exhaust air. By changing the flow path (41) area, the turbine impeller (19
), the first
A stopper (87) is provided on the shaft (71) side of the link (73) to limit the bending position of the arm (69) and the first link (73) to the side opposite to the actuator (48).

The predetermined frictional force applied to the joint between the first link (73) and the movable member tip (47A) refers to the predetermined frictional force that is applied to the joint between the first link (73) and the movable member tip (47A). ), (79), opening/closing link mechanism (
51).

It is a matter of theory that the strength is more than enough to uniformly open and close the four movable vanes (37), etc. via (51), and when the movable member (47) moves forward, either ζ One set of movable vanes (37), (37) are in the fully closed position, and the other set of movable vanes (37).

(37) has not reached the fully closed position, screw (8)
1), the movable member tip (47A) and the first link (
73) rotates, and the further forward movement of the movable member (47) causes the first link (73) to swing and activates the other opening/closing link mechanism (51). The movable vanes (37) and (37) are set to a strength that can bring them to the fully closed position.

Therefore, according to this embodiment, even if the distance between the respective support shafts configuring the opening/closing link mechanism (51) changes due to the thermal influence of exhaust gas, all movable vanes (37).

... can be returned to the fully closed position, and the movable vanes (37), ... can be opened and closed regularly.

In addition, since two links (73) and (79) are provided and one link (73) and the movable member tip (47A) are pivoted so that they can be rotated with a force greater than a predetermined value, The link (73) and the movable member tip (47A) can be easily connected using a disk spring (85) or the like as in the embodiment.
It becomes possible to assemble easily and quickly.

In addition, in the embodiment, the arms (69), (69)
The space is connected by two links, first and second links (73) and (79), and a movable member (
47) was explained about the case where the arm (
89) and (li9), the number of links connecting each arm (69) is arbitrary.

(69) It is a matter of opinion that the length etc. of (69) can be set appropriately so that there are three or more.In the case of one, both ends of the link can be connected to arms (69) and (69) respectively. They can be connected using pins and long grooves.

(Effects of the Invention) As is clear from the above invention, according to the present invention, all movable vanes can be returned to the fully closed position even when affected by the heat of exhaust gas, and can be easily assembled. A movable vane drive mechanism for a turbocharger can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the turbocharger, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a detailed view of the movable vane drive mechanism, and FIG. 4 is a schematic side view of the opening/closing link mechanism. Fifth
The figure is a sectional view taken along the line V-V in FIG. 4, and FIG. 6 is a sectional view of the connecting portion between the first link and the movable member. In the drawings, (1) is the turbocharger, (3) is the compressor housing, (5) is the turbine housing, and (7) is the turbocharger.
is the center housing, (13) is the compressor impeller, (19) is the turbine wheel, (33B) is the fixed vane, (37) is the movable vane, (47) is the movable member, (5
1) is the opening/closing link mechanism, (73) is the first link, (79
) is the second link. Figure 2 Figure 4■

Claims (1)

[Scope of Claims] A plurality of movable vanes of a variable capacity turbine that change the flow path area of an exhaust flow path in a turbine housing; and two sets of movable vanes are provided corresponding to the plurality of movable vanes, and the corresponding movable vanes are opened and closed. A movable vane drive mechanism for a turbocharger comprising an opening/closing link mechanism to be operated, and a movable member connected to an actuator to reciprocate and operate the two sets of opening/closing link mechanisms, the movable vane drive mechanism intersecting the reciprocating direction of the movable member. A link is provided which extends in the direction, and whose both ends are connected to the arms constituting the two sets of opening/closing link mechanisms to operate the two sets of opening/closing link mechanisms in conjunction with each other. A movable vane drive mechanism for a turbocharger, characterized in that the movable vane drive mechanism is pivoted so that it can rotate when a force exceeding a specified value is applied.