JP5010712B2 - Variable displacement exhaust turbocharger and variable nozzle mechanism component manufacturing method - Google Patents

Description

  The present invention relates to a structure of a drive ring and a lever plate in a variable displacement exhaust turbocharger that is used in an exhaust turbocharger of an internal combustion engine and includes a variable nozzle mechanism that changes a blade angle of a plurality of nozzle vanes, and The present invention relates to a method for assembling the variable nozzle mechanism.

  As one of the technologies related to the structure of the drive ring and the lever plate in the variable displacement exhaust turbocharger having a variable nozzle mechanism that changes the blade angle of a plurality of nozzle vanes, Patent Document 1 relating to the invention of the present applicant (specially No. 2002-285804) is provided.

  In such a technique, a plurality of nozzle vanes rotatably supported by a nozzle mount fixed to a turbine casing, an annular drive ring interlocked with an actuator, and the same number of nozzle vanes are disposed along the circumferential direction. The one end side is connected to the drive ring via a connecting pin portion and a groove portion into which the connecting pin portion is fitted, and the other end side is provided with a lever plate connected to the nozzle vane, Each lever plate is swung by rotation, and a variable nozzle mechanism for changing the blade angle of the plurality of nozzle vanes by swinging the lever plate is provided, and the connecting pin portion is connected to either the lever plate or the drive ring. One of them is integrally formed with the base material by integral molding such as extrusion molding or precision casting.

JP 2002-285804 A

  However, in the technique disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-285804), a connecting pin portion for connecting the drive ring and each lever plate is formed by extrusion molding one of each lever plate or drive ring. However, it is only formed integrally with the base material by integral molding such as precision casting, and it is not disclosed how to deal with wear of the connecting pin portion and the groove for engaging the connecting pin portion of the mating member.

  In this technique, the drive ring can be arranged between the side surface of the lever plate and the side surface of the nozzle mount in an axially arranged form with the lever plate and the nozzle mount. No means for preventing the ring from being mounted on the lever plate side from the nozzle mount is disclosed.

  In view of the problems of the prior art, the present invention further improves the technique of Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-285804), and a connection pin portion and a connection formed integrally with the base material of each lever plate or drive ring. Variable capacity with means to prevent wear of pin engaging groove and means to prevent drive ring nozzle mount from being pulled out to lever plate side and eliminate possibility of malfunction of variable nozzle mechanism An object is to provide a type exhaust turbocharger.

The present invention achieves such an object, and a plurality of nozzle vanes rotatably supported by a nozzle mount fixed to a case including a turbine casing, an annular drive ring interlocked with an actuator, and a circumferential direction. The same number of nozzle vanes are disposed along the lever plate, one end of which is connected to the drive ring via a connecting pin portion and a groove portion into which the connecting pin portion is fitted, and the other end is connected to the nozzle vane. The variable displacement exhaust turbocharger is provided with a variable nozzle mechanism that swings each lever plate by rotating the drive ring and changes the blade angle of the plurality of nozzle vanes by swinging the lever plate. In the machine
The drive ring is arranged between the lever plate side surface and the nozzle mount side surface in the form of an axial arrangement with the lever plate and nozzle mount, and can be brought into contact with the outer surface of the drive ring. A portion for preventing axial movement of the drive ring is provided on the side of the nozzle mount;
The portion that prevents the drive ring from moving in the axial direction is an annular groove formed in a circumferential direction on a side portion of the nozzle mount, and the drive ring is fitted into the groove so that the groove The side surface of the drive ring is configured to prevent the drive ring from moving in the axial direction, and an engagement recess formed in the inner peripheral surface of the drive ring along the circumferential direction is provided at a portion for blocking the axial movement. And an engaging convex portion formed along the circumferential direction on the outer peripheral surface of the nozzle mount, and the engaging concave portion and the engaging convex portion are engaged by the relative movement in the axial direction of the drive ring and the nozzle mount. In addition, an engagement portion is provided that is fitted so as to further rotate the drive ring by a predetermined amount in the circumferential direction to prevent the drive ring from being pulled out in the axial direction .

  According to this invention, the drive ring is fitted into an annular groove provided along the circumferential direction on the side of the nozzle mount, and the axial movement of the drive ring is prevented by the side surface of the groove. The drive ring can be reliably prevented from being pulled out in an axial direction by means that do not require extra members and do not increase the number of parts and increase the part cost. Occurrence of malfunction of the variable nozzle mechanism associated with extraction of the ring in the axial direction can be prevented.

The invention of the manufacturing method of the variable displacement exhaust turbocharger provided with the variable nozzle mechanism configured as described above,
The drive ring is disposed between the side surface of the lever plate and the side surface of the nozzle mount in which an annular groove is formed in a side portion, and is arranged in parallel with the lever plate and the nozzle mount in the axial direction. The drive recess and the nozzle mount are relatively moved in the axial direction between the engagement recess formed on the inner peripheral surface of the nozzle along the circumferential direction and the engagement protrusion formed on the outer peripheral surface of the nozzle mount along the circumferential direction. After engaging the drive ring with the groove of the nozzle mount, the drive ring is rotated by a predetermined amount in the circumferential direction to prevent the drive ring from being pulled out of the groove, A lever plate is assembled to a side portion of the drive ring, and the lever plate is fixed to the nozzle vane.

  According to this invention, the drive ring is fitted into the annular groove provided in the circumferential direction on the side portion of the nozzle mount, so that the number of parts and the cost of parts can be increased without adding a special member. By means that do not accompany it, it is possible to reliably avoid the drive ring from being pulled out in the axial direction, and to prevent the malfunction of the variable nozzle mechanism that accompanies the drive ring from being pulled out in the axial direction.

The present invention also provides a variable displacement exhaust turbocharger including the variable nozzle mechanism.
At least one contact portion of the connection pin portion and the groove portion into which the connection pin portion is fitted is coated with a PVD process (physical ion adsorption process) or a CVD process (chemical) It is preferable to form a film by a general ion adsorption treatment.
According to this invention, by forming a hard coating by PVD processing or a hard coating by CVD processing at the contact portion between the connecting pin portion and the groove portion, the effect of reducing the wear of the contact portion between the connecting pin portion and the groove portion is further improved. Can be improved.

The present invention also provides the variable displacement exhaust turbocharger,
The connection pin portion is formed integrally with a base material by integral molding such as extrusion molding, precision casting, or the like, and at least one of the connection pin portion and the groove portion. It is preferable to subject the contact portion to a surface hardening treatment including a diffusion penetration treatment.
In this invention, specifically, the drive ring is arranged between the side surface of the lever plate and the side surface of the nozzle mount in the form of being arranged in parallel with the lever plate and the nozzle mount, and each lever The connecting pin portion protrudes integrally with the base material from the side surface of either the plate or the drive ring member, and the connecting pin portion is engaged with the groove portion formed on the side portion of the other member. It is preferable to configure so as to match.

The invention of the manufacturing method of the variable displacement exhaust turbocharger provided with the variable nozzle mechanism configured as described above,
For either one of the lever plates or the drive ring, one side of the side is pressed and the opposite side is projected to extrude the connecting pin part, or the connecting pin part is formed on one side of the side by precision casting. By projecting, the connecting pin part is integrally formed with a base material, and then at least one contact part of the connecting pin part and the groove part is subjected to a surface hardening process including a diffusion permeation process. To do.

  According to this invention, since the connecting pin portion is integrally formed with the base material by integral molding such as extrusion molding, precision casting, etc., either one of each lever plate or drive ring, each lever plate or drive ring is made high. The connecting pin portion can be easily formed integrally with each lever plate or drive ring by being composed of a steel material that has toughness but is relatively soft and can be easily extruded, or a precision cast material, and at least a connecting pin portion and By subjecting the contact portion with the groove portion into which the connecting pin portion is fitted to the surface hardening treatment including diffusion penetration treatment, the hardness of the contact portion can be increased, and the wear of the contact portion between the connecting pin portion and the groove portion can be reduced. Can be reduced.

  Thereby, by increasing the hardness of the contact portion between the connecting pin portion and the groove portion into which the connecting pin portion is fitted, the wear of the contact portion is suppressed and high durability is maintained, and the connecting pin portion is It can be easily manufactured by integral molding with the lever plate or the drive ring by one-step extrusion molding or precision casting, compared with the case where the connecting pin part is manufactured separately and the lever plate and the drive ring are connected. The number of assembly steps and the assembly cost can be reduced, and the number of parts and the part cost can be reduced.

According to the present invention, the drive ring is fitted into the annular groove formed along the circumferential direction on the side portion of the nozzle mount, that is, formed along the circumferential direction on the inner peripheral surface of the drive ring. The engagement recess and the engagement protrusion formed on the outer peripheral surface of the nozzle mount along the circumferential direction are moved relative to each other in the axial direction, and further rotated by a predetermined amount in the circumferential direction. A simple structure in which an engagement portion for fitting the drive ring so as to prevent the drive ring from being pulled out is provided, and no extra member is added, so that the number of parts and the cost of parts are not increased. With this means, it is possible to reliably avoid the drive ring from being pulled out in the axial direction, and to prevent the malfunction of the variable nozzle mechanism that accompanies the drive ring from being pulled out in the axial direction.

According to the present invention, the hardness of the contact portion can be increased by subjecting the contact portion between the connecting pin portion and the groove portion into which the connecting pin portion is fitted to the surface hardening treatment including diffusion penetration treatment. , While maintaining high durability by suppressing wear of the contact portion, either lever plate or drive ring is integrally formed with the base material by integral molding such as extrusion molding, precision casting, etc. The pin part can be easily manufactured by integral molding with the lever plate or drive ring by one-step extrusion or precision casting, and the connecting pin part is manufactured separately to connect the lever plate and the drive ring. Compared to the number of assembly steps and the assembly cost, the number of components and the component cost can be reduced.
As for the surface hardening treatment, for example, when a combination of metals such as steel is used, there is a concern that large wear may occur due to wear (adhesion wear) caused by adhesion between the two materials. However, when one surface is treated, the surface is hardened by the formation of ceramics or the formation of an intermetallic compound, and adhesion wear can be reduced. Moreover, since the surface roughness accompanying sliding can be prevented when cured by the surface treatment, it is possible to reduce the occurrence of scratching abrasion (abrasive abrasion) due to the surface roughness even when the other surface is not subjected to surface treatment. For the reasons as described above, the effect of reducing wear can be expected only by applying a surface treatment on one side.

The variable nozzle mechanism concerning 1st Example of this invention is shown, (A) is the front view seen from the lever plate side, (B) is the sectional view on the AA line in (A). The variable nozzle mechanism which concerns on 2nd Example of this invention is shown, (A) is the front view seen from the lever plate side, (B) is the sectional view on the AA line in (A). The variable nozzle mechanism which concerns on the reference example 1 of this invention is shown, (A) is the front view seen from the lever plate side, (B) is CC sectional view taken on the line in (A), (C) shows a modification. It is the CC equivalent cross-sectional view. The variable nozzle mechanism which concerns on 3rd Example of this invention is shown, (A) is the front view seen from the lever plate side, (B) is the DD sectional view taken on the line in (A). It is a principal part longitudinal cross-sectional view of the variable displacement type | mold exhaust turbocharger provided with the variable nozzle mechanism which concerns on this invention.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 5 is a longitudinal sectional view of an essential part of a variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to the present invention.
In FIG. 5, 30 is a turbine casing, and 38 is a scroll formed in a spiral shape on the outer periphery of the turbine casing 30. 34 is a radial flow type turbine rotor, 35 is a compressor, 32 is a turbine shaft connecting the turbine rotor 34 and the compressor 35, 31 is a compressor housing, and 36 is a bearing housing.
A turbine shaft 32 that connects the turbine rotor 34 and the compressor 35 is rotatably supported by a bearing housing 36 via two bearings 37 and 37. 8 is an exhaust gas outlet, and 40 is a rotational axis of the exhaust turbocharger.

Reference numeral 2 denotes a nozzle vane. A plurality of nozzle vanes are arranged on the inner peripheral side of the scroll 38 at equal intervals in the circumferential direction of the turbine, and a nozzle shaft 2 a formed at the blade tip of the nozzle 38 is fixed to the turbine casing 30. The mount 5 is rotatably supported.
Reference numeral 41 denotes an actuator, 33 denotes an actuator rod, and 39 denotes a drive mechanism that connects the actuator rod 33 and the drive ring 3. The reciprocating motion of the actuator rod 33 is converted into rotational motion of the drive ring 3.
A variable nozzle mechanism 100 changes the blade angle of the nozzle vane 2.

  During operation of the variable displacement exhaust turbocharger with a variable nozzle mechanism configured as shown in FIG. 5, exhaust gas from an internal combustion engine (not shown) enters the scroll 38 and circulates along the spiral of the scroll 38. While flowing into the nozzle vane 2. Then, the exhaust gas flows between the blades of the nozzle vane 2 and flows into the turbine rotor 34 from the outer peripheral side, and flows radially toward the center side to perform expansion work on the turbine rotor 34. It flows out in the axial direction, is guided to the exhaust gas outlet 8, and is sent out of the machine.

In controlling the capacity of such a variable capacity turbine, the blade angle of the nozzle vane 2 is set so that the exhaust gas flowing through the nozzle vane 2 has a required flow rate with respect to the actuator 41. Blade angle control means (not shown) Set by. The reciprocating displacement of the actuator 41 corresponding to the blade angle is transmitted to the drive ring 3 via the drive mechanism 39, and the drive ring 3 is rotationally driven.
By rotation of the drive ring 3, the lever plate 1 is rotated around the nozzle shaft 2a via a connecting pin portion 10 (or 11) described later, and the nozzle vane 2 is rotated by rotation of the nozzle shaft 2a. Thus, the blade angle set by the actuator 41 is changed.
The present invention relates to an improvement of the variable nozzle mechanism 100 that controls the capacity of such a variable capacity turbine.

1A and 1B show a variable nozzle mechanism according to a first embodiment of the present invention, in which FIG. 1A is a front view seen from the lever plate side, and FIG. 1B is a cross-sectional view taken along line AA in FIG.
Reference numeral 100 denotes a variable nozzle mechanism 100 that changes the blade angle of the nozzle vane 2 and is configured as follows.
Reference numeral 3 denotes a disk-shaped drive ring that is rotatably supported by the nozzle mount 5 and has grooves 3y that are engaged with connecting pin portions 10 (to be described later) on the outer circumferential side at equal intervals in the circumferential direction. ing. Reference numeral 3z denotes a drive groove with which the link of the drive mechanism 39 is engaged.
Reference numeral 1 denotes a lever plate, which is installed at equal intervals in the circumferential direction in the same number as the grooves 3y of the drive ring 3. A connecting pin portion 10 is formed on the outer peripheral side of each lever plate 1, and the nozzle shaft 2 a of the nozzle vane 2 is fixed on the inner peripheral side.
Reference numeral 6 denotes an annular support plate, and reference numeral 7 denotes a plurality of nozzle supports that connect the support plate 6 and the nozzle mount 5.

In the variable nozzle mechanism 100, as shown in FIG. 1B, the lever plate 1 is arranged on the axially outer side (exhaust gas outlet 8 side in FIG. 5), and the side surface of the lever plate 1 and the nozzle mount 5 are arranged. Between the side surfaces, the drive ring 3 is arranged in parallel with the lever plate 1 and the nozzle mount 5 in the axial direction.
The connecting pin portion 10 is formed by extrusion by pressing one side surface of each lever plate 1 with a press to form a circular recess 10a on the one side surface and projecting the opposite side surface in a cylindrical shape. It is formed integrally with the base material.
Moreover, when each said lever plate 1 is comprised with a precision casting, the said connection pin part 10 is integrally molded with the lever plate 1 base material at the time of casting.
Then, one or both of the outer peripheral surface of the connecting pin portion 10 and the groove 3y of the drive ring 3 with which the connecting pin portion 10 is engaged are chromium diffusion penetration treatment, aluminum diffusion penetration treatment, vanadium diffusion penetration treatment, niobium diffusion. A surface hardening treatment such as a diffusion penetration treatment such as a penetration treatment, a boron diffusion penetration treatment, or a nitriding treatment, a combined treatment of the diffusion penetration treatment and a carburizing treatment, or the like is performed.

In manufacturing the variable nozzle mechanism 100 configured as described above, each lever plate 1 is pressed by pressing one side surface with a press to form a circular recess 10a on the one side surface. The connecting pin portion 10 is projected on the plate 1 integrally with the base material. On the other hand, the drive ring 3 is formed with a groove 3y by machining, or when the drive ring 3 is a precision casting, it is formed by precision casting.
Next, one or both of the outer peripheral surface of the connecting pin portion 10 and the groove 3y of the drive ring 3 with which the connecting pin portion 10 engages are subjected to the surface hardening treatment as described above.

2A and 2B show a variable nozzle mechanism according to a second embodiment of the present invention, in which FIG. 2A is a front view seen from the lever plate side, and FIG. 2B is a cross-sectional view taken along line AA in FIG.
In the second embodiment, one side surface of the drive ring 3 is pressed against the drive ring 3 side at equal intervals in the circumferential direction by a press, and the one side surface is similar to the first embodiment. The connecting pin portion 11 is formed integrally with the base material by extrusion molding in which the circular recess 3a is formed and the opposite side surface protrudes in a cylindrical shape. Further, the outer peripheral portion of each lever plate 1 is formed in a bifurcated shape, and a groove 1b is provided in which the connecting pin portion 11 is engaged.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

According to the first and second embodiments, the connecting pin portion 10 (11) for connecting the drive ring 3 and each lever plate 1 is formed by extruding one of the lever plate 1 or the drive ring 3 and precision. Since it is integrally formed with the base material by integral molding such as casting, each lever plate 1 or drive ring 3 is made of steel or precision cast material that has high toughness but is relatively soft and easy to extrude. Thus, the connecting pin portion 10 can be easily formed integrally with each lever plate 1 or drive ring 3.
At the same time, by subjecting one or both of the contact portions between the connecting pin portion 10 (or 11) and the groove 3y (or 1b) in which the connecting pin portion is fitted to the surface hardening treatment including diffusion penetration treatment, The hardness of the contact portion can be increased, or adhesion between materials can be prevented, and wear of the contact portion between the connecting pin portion (or 11) and the groove 3y (or 1b) can be reduced.

Thereby, by increasing the hardness of the contact portion between the connecting pin portion 10 (or 11) and the groove 3y (or 1b) into which the connecting pin portion is fitted, the wear of the contact portion is suppressed and high. While maintaining the durability, the connecting pin portion 10 (or 11) can be easily manufactured integrally with the lever plate 1 or the drive ring 3 by one-step extrusion molding or precision casting. Compared to a case where the lever plate 1 and the drive ring 3 are separately manufactured and connected, the number of assembling steps and the assembling cost can be reduced, and the number of parts and the cost of the parts can be reduced.
(Reference Example 1)

3A and 3B show a variable nozzle mechanism according to Reference Example 1 of the present invention, in which FIG. 3A is a front view seen from the lever plate side, and FIG. 3B is a cross-sectional view taken along line CC in FIG. (C) is a cross-sectional view corresponding to the CC line showing a modification. In addition, the AA line sectional view of FIG. 3 in this reference example 1 is the same as FIG.
In this reference example 1, as in the first and second embodiments, the drive ring 3 is placed between the lever plate 1 and the nozzle mount 5 between the side surface of the lever plate 1 and the side surface of the nozzle mount 5. Are arranged in parallel with each other in the axial direction, and a plurality of the drive rings 3 are prevented from moving in the axial direction, that is, being pulled out to the lever plate 1 side, so as to be able to contact the outer surface 3a of the drive ring 3 ( In this example, four flanges 12 at equal intervals in the circumferential direction are fixed to the side of the nozzle mount 5.

  Further, in Reference Example 1, as shown in FIG. 3C, a groove 13 is formed in the outer surface 3c of the drive ring 3 and the side surface 5c of the nozzle mount 5, and the head of the flange 12 is formed in the groove 13. A compact structure can be obtained by fitting the portion so that the flange 12 does not protrude to the lever plate 1 side.

According to the first reference example, the collar 12 is fixed to a plurality of circumferential positions (four positions in this example) on the side of the nozzle mount 5 with a very simple structure and low cost. Thus, it is possible to reliably avoid the drive ring 3 from being pulled out in the axial direction, and to prevent malfunction of the variable nozzle mechanism 100 associated with the drive ring 3 being pulled out in the axial direction.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

4A and 4B show a variable nozzle mechanism according to a third embodiment of the present invention, in which FIG. 4A is a front view seen from the lever plate side, and FIG. 4B is a sectional view taken along line DD in FIG. In addition, the AA sectional view of FIG. 4 in the third embodiment is the same as FIG.
In the third embodiment, like the first and second embodiments, the drive ring 3 is disposed between the lever plate 1 and the nozzle mount between the side surface of the lever plate 1 and the side surface of the nozzle mount 5. 5 is arranged in parallel with the axial direction, an annular groove 15 is provided along the circumferential direction on the side of the nozzle mount 5, the drive ring 3 is fitted in the groove 15, The side surface of the groove 15 prevents the drive ring 3 from being pulled out to the lever plate 1 side.
Then, as shown in FIG. 4A, the engagement recess 14a formed in the drive ring 3 and the engagement formed in the side 5z of the nozzle mount 5 are formed in the drive ring 3 and the side 5z of the nozzle mount 5. An engaging portion 14 that engages the convex portion 14b is provided.

Therefore, when assembling the variable nozzle mechanism 100 in the third embodiment, the drive ring 3 is placed between the side surface of the lever plate 1 and the side surface of the nozzle mount 5 provided with the annular groove 15 in the side portion. The lever plate 1 and the nozzle mount 5 are arranged in parallel with each other in the axial direction, and the drive ring 3 is moved in the axial direction toward the nozzle mount 5 so that the engagement recess 14a and the side 5z of the nozzle mount 5 The drive ring 3 is fitted into the groove 15 of the nozzle mount 5 by engaging with the engaging convex portion 14 b.
Next, the drive ring 3 is rotated by a predetermined amount in the circumferential direction, and the engagement concave portion 14a and the engagement convex portion 14b are shifted in the circumferential direction, so that the drive ring 3 is removed from the groove 15. Stop. Further, the lever plate 1 is assembled to the side of the drive ring 3, and the lever plate 1 is fixed to the nozzle vane 2.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

  According to the third embodiment, the number of components can be reduced without additionally installing a special member in which the drive ring 3 is fitted into the annular groove 15 provided in the circumferential direction on the side portion 5z of the nozzle mount 5. By means that do not accompany the increase and the cost of parts, the drive ring 3 can be reliably removed in the axial direction, and the variable nozzle mechanism 100 accompanying the axial removal of the drive ring 3 can be avoided. Can be prevented from occurring.

In the fourth embodiment of the present invention, in the variable displacement exhaust turbocharger including the variable nozzle mechanism 100 as shown in FIGS. 1 to 4, the connection pin portion 10 (or 11) and the connection pin PVD treatment (physical ion adsorption) is applied to one or both contact portions of the groove 3y (or 1b) in which the portion is fitted (or the whole connecting pin portion 10 (or 11) and groove 3y (or 1b)). Film) or CVD film (chemical ion adsorption process).
According to the fourth embodiment, a hard film is formed by PVD processing or a hard coating is formed by CVD processing at the contact portion between the connecting pin portion 10 (or 11) and the groove 3y (or 1b). The effect of reducing wear at the contact portion between the pin portion 10 (or 11) and the groove 3y (or 1b) can be further improved.

  According to the present invention, the connecting pin portion integrally formed with each lever plate or the base material of the drive ring, the means for preventing the wear of the connecting pin portion engaging groove, and the extraction of the drive ring from the nozzle mount to the lever plate side Therefore, it is possible to provide a variable displacement exhaust turbocharger having means for preventing the occurrence of malfunctions of the variable nozzle mechanism and eliminating the possibility of malfunction.

DESCRIPTION OF SYMBOLS 1 Lever plate 2 Nozzle vane 2a Nozzle shaft 3 Drive ring 3y, 1b Groove 5 Nozzle mount 10, 11 Connection pin part 14 Engagement part 15 Groove 30 Turbine casing 34 Turbine rotor 35 Compressor 41 Actuator 100 Variable nozzle mechanism

Claims (6)

A plurality of nozzle vanes rotatably supported by a nozzle mount fixed to a case including a turbine casing, an annular drive ring interlocked with an actuator, and the same number as the nozzle vanes are disposed along the circumferential direction. The drive ring is connected to the drive ring through a connecting pin portion and a groove portion into which the connecting pin portion is fitted, and the other end side is connected to the nozzle vane. In the variable displacement exhaust turbocharger provided with a variable nozzle mechanism that swings each lever plate and changes the blade angle of the plurality of nozzle vanes by swinging the lever plate,
The drive ring is arranged between the lever plate side surface and the nozzle mount side surface in the form of an axial arrangement with the lever plate and nozzle mount, and can be brought into contact with the outer surface of the drive ring. A portion for preventing axial movement of the drive ring is provided on the side of the nozzle mount;
The portion that prevents the drive ring from moving in the axial direction is an annular groove formed in a circumferential direction on a side portion of the nozzle mount, and the drive ring is fitted into the groove so that the groove The side of the drive ring is configured to prevent the axial movement of the drive ring, and the portion for blocking the axial movement includes
An engagement recess formed along the circumferential direction on the inner peripheral surface of the drive ring; and an engagement projection formed along the circumferential direction on the outer peripheral surface of the nozzle mount. A mating projection is engaged with the drive ring and the nozzle mount by relative movement in the axial direction, and is further rotated by a predetermined amount in the circumferential direction to engage the drive ring so as not to be pulled out in the axial direction. A variable displacement exhaust turbocharger equipped with a variable nozzle mechanism characterized in that a joint is provided . At least one contact portion of the connection pin portion and the groove portion into which the connection pin portion is fitted is coated with a PVD process (physical ion adsorption process) or a CVD process (chemical) 2. A variable capacity exhaust turbocharger equipped with a variable nozzle mechanism according to claim 1, wherein a film is formed by a general ion adsorption process . The connecting pin portion is formed integrally with the base material by extrusion molding or precision casting of either one of the lever plates or the drive ring, and at least on the contact portion of either the connecting pin portion or the groove portion, 2. A variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 1, wherein a surface hardening process including a diffusion permeation process is performed . Between the side surface of the lever plate and the side surface of the nozzle mount, the drive ring is arranged in an axially arranged form with the lever plate and the nozzle mount, and either one of the lever plate or the drive ring The connecting pin portion protrudes integrally with the base material from the side surface of the side member, and the connecting pin portion is engaged with the groove portion formed in the side portion of the other side member. A variable displacement exhaust turbocharger comprising the variable nozzle mechanism according to claim 1 . A manufacturing method for manufacturing a variable displacement exhaust turbocharger comprising the variable nozzle mechanism according to claim 1,
The drive ring is disposed between the side surface of the lever plate and the side surface of the nozzle mount in which an annular groove is formed in a side portion, and is arranged in parallel with the lever plate and the nozzle mount in the axial direction. The drive recess and the nozzle mount are relatively moved in the axial direction between the engagement recess formed on the inner peripheral surface of the nozzle along the circumferential direction and the engagement protrusion formed on the outer peripheral surface of the nozzle mount along the circumferential direction. After engaging the drive ring with the groove of the nozzle mount, the drive ring is rotated by a predetermined amount in the circumferential direction to prevent the drive ring from being pulled out of the groove, A variable displacement type exhaust ter equipped with a variable nozzle mechanism, wherein a lever plate is assembled to a side portion of the drive ring, and the lever plate is fixed to the nozzle vane. Manufacturing method of the supercharger. A manufacturing method for manufacturing a variable displacement exhaust turbocharger comprising the variable nozzle mechanism according to any one of claims 1 to 4,
For either one of the lever plates or the drive ring, one side of the side is pressed and the opposite side is projected to extrude the connecting pin part, or the connecting pin part is formed on one side of the side by precision casting. By projecting, the connecting pin part is integrally formed with a base material, and then at least one contact part of the connecting pin part and the groove part is subjected to a surface hardening process including a diffusion permeation process. Of manufacturing a variable displacement exhaust turbocharger including a variable nozzle mechanism.

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