WO2016079872A1 - 可変ノズル機構および可変容量型ターボチャージャ - Google Patents
可変ノズル機構および可変容量型ターボチャージャ Download PDFInfo
- Publication number
- WO2016079872A1 WO2016079872A1 PCT/JP2014/080944 JP2014080944W WO2016079872A1 WO 2016079872 A1 WO2016079872 A1 WO 2016079872A1 JP 2014080944 W JP2014080944 W JP 2014080944W WO 2016079872 A1 WO2016079872 A1 WO 2016079872A1
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- WO
- WIPO (PCT)
- Prior art keywords
- plate
- annular member
- nozzle mechanism
- exhaust gas
- variable nozzle
- Prior art date
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 230000008646 thermal stress Effects 0.000 description 13
- 230000014509 gene expression Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910001026 inconel Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
- F01D17/165—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/005—Selecting particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/026—Scrolls for radial machines or engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/04—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output
- F02C6/10—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output supplying working fluid to a user, e.g. a chemical process, which returns working fluid to a turbine of the plant
- F02C6/12—Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/40—Application in turbochargers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/51—Inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
- F05D2260/941—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] particularly aimed at mechanical or thermal stress reduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/171—Steel alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/502—Thermal properties
- F05D2300/5021—Expansivity
- F05D2300/50212—Expansivity dissimilar
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present disclosure relates to a variable nozzle mechanism and a variable displacement turbocharger.
- variable nozzle mechanism of the variable displacement turbocharger adjusts the exhaust gas passage area in the turbine housing to change the flow velocity and pressure of the exhaust gas to the turbine blade to enhance the supercharging effect.
- variable nozzle mechanism generally comprises a pair of annular plates 12, 14 disposed opposite each other to form an exhaust gas passage 24 and a pair of annular plates 12, 14.
- a plurality of rotatably supported nozzle vanes 16 are provided, and the passage area of the exhaust gas passage 24 is adjusted by changing the blade angles of the plurality of nozzle vanes 16.
- Patent No. 5010631 gazette
- the annular plates 12 and 14 in the variable nozzle mechanism shown in FIG. 5 are exposed to high temperature exhaust gas as the engine is operated, so the exhaust gas is generated by engine start / stop and other load fluctuations.
- the temperature or the flow rate of the annular plate 12 changes, the temperature distribution in the radial direction of the annular plates 12 and 14 tends to be transiently uneven.
- the inner peripheral edge of the annular plates 12 and 14 on the side of the exhaust gas passage 24 by the repeated action of the thermal stress (see FIG. 7) caused by such uneven temperature distribution. Fatigue damage is likely to occur in the vicinity.
- stress is likely to increase from the inner peripheral edge 12a1 of the annular plate 12 to the support hole 12h provided with the support holes 12h for rotatably supporting the nozzle vanes 16, and fatigue damage is caused. It was easy to occur (see Figure 8).
- Patent Document 1 does not disclose any configuration for suppressing the occurrence of fatigue damage in the vicinity of the inner peripheral edge of the annular plate on the exhaust gas passage side, and fatigue damage occurs in the vicinity of the inner peripheral edge Even the issue of not being disclosed.
- the present invention has been made in view of the above-described conventional problems, and an object thereof relates to an annular plate forming an exhaust gas passage in a variable nozzle mechanism, and an exhaust gas passage side of the annular plate It is an object of the present invention to provide a variable nozzle mechanism capable of suppressing the occurrence of fatigue damage near the inner peripheral edge of the
- a variable nozzle mechanism of a variable displacement turbocharger is disposed between an annular first plate and the first plate, and exhausts between the first plate and the first plate.
- An annular second plate forming a gas passage, a plurality of nozzle vanes rotatably supported between the first plate and the second plate, and an annular member inserted on the inner peripheral side of the first plate
- the first plate has a surface facing the exhaust gas passage, and a back surface opposite to the surface, and the annular member is a surface (a face facing the exhaust gas passage).
- a gap is provided which extends along the thickness direction of the.
- first plate and second plate in the present specification are one of “nozzle mount” and “nozzle plate” described in “embodiments for carrying out the invention”. And the other. Therefore, a form in which the "first plate” corresponds to the “nozzle mount” and the “second plate” corresponds to the nozzle plate, and the “first plate” corresponds to the "nozzle plate” and the “second plate” Both of the forms corresponding to “nozzle mount” are included in the variable nozzle mechanism described in the above (1). Also in the following, unless otherwise stated, the terms “first plate” and “second plate” are used to mean including the above two forms. Moreover, the wording "surface” shall mean “front surface” rather than “surface” unless otherwise stated.
- the temperature and the flow rate of the exhaust gas change due to start, stop, and other load fluctuations of the engine, and the temperature distribution in the radial direction in the first plate and the annular member transiently Even if it becomes uneven, the thermal stress can be effectively reduced because the first plate and the annular member thermally expand without being restrained on the surface side of both members until the gap is filled. This can suppress the occurrence of fatigue damage near the inner peripheral edge on the surface side of the first plate.
- the annular member is interference-fit to the first plate on the back surface side of the annular member rather than the gap. Have a tight fit.
- variable nozzle mechanism it is possible to prevent the annular member from falling off from the first plate with a simple configuration while securing the above-mentioned gap between the first plate and the annular member. .
- the annular member in the variable nozzle mechanism according to (2), is abutted against the inner peripheral surface of the first plate in the thickness direction of the first plate.
- the stepped portion is provided, and the tight fitting portion is tightly fitted to the first plate on the back surface side of the annular member with respect to the stepped portion.
- variable nozzle mechanism it is possible to more reliably prevent the dropout of the annular member from the first plate with a simple configuration.
- the annular member abuts against the inner circumferential surface of the first plate in the thickness direction of the first plate.
- the variable nozzle mechanism further includes a biasing member that biases the annular member toward the stepped portion.
- the annular member can be prevented from coming off from the first plate while securing the above-mentioned gap between the first plate and the annular member.
- variable nozzle mechanism in the variable nozzle mechanism according to (4), the inner peripheral edge of the back surface of the first plate and the annular member between the first plate and the annular member A second gap is provided extending from the outer peripheral edge of the back surface to the step along the thickness direction of the first plate.
- the fitting between the first plate and the annular member is fitting with a gap over the entire area in the thickness direction of the first plate. Thermal stress near the inner circumferential surface can be effectively reduced. Therefore, the occurrence of fatigue damage in the vicinity of the inner peripheral surface of the first plate can be effectively suppressed.
- the stepped portion is provided over the entire circumference of the inner peripheral surface of the first plate.
- the stepped portion is provided only on a part of the inner peripheral surface of the first plate by providing the stepped portion over the entire circumference of the inner peripheral surface of the first plate. Compared to the case, the thermal stress in the vicinity of the stepped portion is made uniform, and the occurrence of fatigue damage in the vicinity of the stepped portion of the first plate can be suppressed.
- the first plate and the annular member are formed of stainless steel.
- variable nozzle mechanism In the variable nozzle mechanism according to the above (1) to (6), the occurrence of fatigue damage in the vicinity of the inner peripheral edge on the surface side of the first plate can be suppressed. Therefore, as described in the above (7), even when the inexpensive stainless steel having a material strength lower than that of the nickel base alloy is used for the first plate and the annular member, near the inner peripheral edge on the surface side of the first plate The occurrence of fatigue damage can be suppressed. Therefore, it is possible to suppress the occurrence of fatigue damage in the vicinity of the inner peripheral edge on the surface side of the first plate, and to suppress the increase in the manufacturing cost of the variable nozzle mechanism.
- the first plate is a nozzle mount that constitutes a hub sidewall of the exhaust gas passage
- the second plate The plate is a nozzle plate constituting a shroud side wall of the exhaust gas passage
- the first plate is provided with a plurality of support holes for rotatably supporting the shaft portions of the plurality of nozzle vanes.
- the nozzle mount that constitutes the hub side wall of the exhaust gas passage is provided with a support hole for rotatably supporting the nozzle vane, and the inner peripheral edge of the nozzle mount to the support hole is as shown in FIG.
- the stress was likely to increase and fatigue damage was likely to occur.
- the variable nozzle mechanism described in (8) by providing the gap, the occurrence of fatigue damage can be effectively suppressed even in a nozzle mount in which such fatigue damage is likely to occur.
- the linear expansion coefficient of the material forming the annular member is smaller than the linear expansion coefficient of the material forming the first plate .
- variable nozzle mechanism described in the above (9), even if the temperature of the annular member becomes temporarily higher than the temperature of the nozzle mount with the operation of the engine, the thermal deformation of the annular member and the thermal deformation of the nozzle mount It is possible to suppress the increase in the amount difference and to suppress the increase in the thermal stress. Therefore, the occurrence of fatigue damage near the inner peripheral edge of the nozzle mount can be suppressed.
- the annular member is formed of a nickel base alloy, and the first plate is formed of stainless steel.
- the annular member in which the thermal stress is likely to be relatively high is formed of an expensive nickel-based alloy with high material strength, and the nozzle mount in which the thermal stress is unlikely to be relatively high
- the stainless steel having low strength and low cost, it is possible to efficiently suppress the occurrence of fatigue damage in the vicinity of the inner peripheral edge of the nozzle mount while suppressing an increase in the manufacturing cost of the variable nozzle mechanism.
- a variable nozzle mechanism of a variable displacement turbocharger is disposed between an annular first plate and the first plate, and exhausts between the first plate and the first plate.
- An annular second plate forming a gas passage, a plurality of nozzle vanes rotatably supported between the first plate and the second plate, and an annular member inserted on the inner peripheral side of the first plate
- the first plate is a nozzle mount constituting a hub side wall of the exhaust gas passage
- the second plate is a nozzle plate constituting a shroud side wall of the exhaust gas passage
- the first plate Are provided with a plurality of support holes for rotatably supporting the shaft portions of the plurality of nozzle vanes, respectively, and the linear expansion relationship of the material forming the annular member is provided. It is smaller than the linear expansion coefficient of the material forming the first plate.
- the annular member is formed along with the operation of the engine by forming the annular member with a material having a linear expansion coefficient smaller than the linear expansion coefficient of the material forming the nozzle mount Even if the temperature of the nozzle mount temporarily becomes higher than the temperature of the nozzle mount, it is possible to suppress the increase in the difference between the thermal deformation of the annular member and the thermal deformation of the nozzle mount and to suppress the increase in thermal stress. Therefore, the occurrence of fatigue damage near the inner peripheral edge of the nozzle mount can be suppressed.
- a variable displacement turbocharger includes a turbine rotor, and a turbine housing that accommodates the turbine rotor and forms a scroll flow passage into which exhaust gas from an engine flows.
- the variable nozzle mechanism according to any one of 1 to 11, wherein exhaust gas having passed through the scroll flow path is supplied to the turbine rotor via the variable nozzle mechanism.
- variable displacement turbocharger described in the above (12)
- the occurrence of fatigue damage in the vicinity of the inner peripheral edge on the surface side of the first plate is suppressed, so maintenance for repair or replacement of the first plate, etc.
- At least one embodiment of the present invention relates to an annular plate forming an exhaust gas passage in a variable nozzle mechanism, wherein the variable nozzle is capable of suppressing the occurrence of fatigue damage in the vicinity of the inner peripheral edge of the annular plate on the exhaust gas passage side.
- a mechanism is provided.
- expressions that indicate that things such as “identical”, “equal” and “homogeneous” are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
- expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
- the expressions “comprising”, “having”, “having”, “including” or “having” one component are not exclusive expressions excluding the presence of other components.
- FIG. 1 is a view schematically showing a partial cross section along a rotation axis of a variable displacement turbocharger 100 according to an embodiment of the present invention.
- the variable displacement turbocharger 100 includes a turbine rotor 2 provided coaxially with a compressor (not shown), a turbine casing 4 accommodating the turbine rotor 2, a bearing housing 6 rotatably supporting the turbine rotor 2, and a turbine casing
- the variable nozzle mechanism 8 is provided between the bearing 4 and the bearing housing 6.
- the scroll passage 10 is formed in the turbine casing 4, and exhaust gas from an engine (not shown) is supplied to the turbine rotor 2 through the variable nozzle mechanism 8 after passing through the scroll passage 10.
- the variable nozzle mechanism 8 includes a nozzle mount 12, a nozzle plate 14, a plurality of nozzle vanes 16, a plurality of lever plates 18, a drive ring 19, a plurality of nozzle supports 20, and an annular member 22.
- the nozzle mount 12 is an annular plate provided on the outer peripheral side of the turbine rotor 2 and configured to rotatably support a plurality of nozzle vanes 16.
- the nozzle mount 12 is provided with a plurality of support holes 12 h (through holes) for rotatably supporting the shaft portions 16 a of the plurality of nozzle vanes 16.
- the nozzle plate 14 is an annular plate disposed to face the nozzle mount 12 and is configured to form an exhaust gas passage 24 with the nozzle mount 12.
- the nozzle plate 14 is provided with a spring seal 25 between the nozzle mount 12 and the turbine housing on the opposite side.
- the nozzle mount 12 constitutes a hub sidewall 28 of the exhaust gas passage 24, and the nozzle plate 14 constitutes a shroud sidewall 30 of the exhaust gas passage 24.
- the nozzle mount 12 and the nozzle plate 14 are connected by a nozzle support 20.
- the plurality of nozzle vanes 16 are disposed between the nozzle mount 12 and the nozzle plate 14 and rotatably supported by the nozzle mount 12.
- the variable nozzle mechanism 8 is configured to adjust the passage area of the exhaust gas passage 24 by changing the blade angles of the plurality of nozzle vanes 16.
- the drive ring 19 is rotationally driven by a driving force transmitted from an actuator (not shown).
- the lever plate 18 engaged with the drive ring 19 rotates the shaft portion 16 a of the nozzle vane 16.
- the nozzle vane 16 rotates and the blade angle of the nozzle vane 16 changes.
- the annular member 22 is inserted on the inner peripheral side of the nozzle mount 12 so as to have a minute gap with the outer peripheral end of the turbine rotor 2.
- the hub side wall 28 of the exhaust gas passage 24 is configured together with the nozzle mount 12.
- FIG. 2 is a partially enlarged view showing one configuration example of the variable nozzle mechanism shown in FIG.
- FIG. 3 is a partially enlarged view showing another configuration example of the variable nozzle mechanism shown in FIG.
- the surface of the nozzle mount 12 facing the exhaust gas passage 24 (the surface facing the nozzle plate 14) is a surface 12 a (herein, Unless stated otherwise, the wording "surface” shall mean “front surface” rather than “surface”, and the surface opposite to the surface 12a shall be the back surface 12b.
- the nozzle mount 12 and the annular member 22 Between the inner peripheral edge 12a1 of the surface 12a of the nozzle mount 12 and the outer peripheral edge 22a1 of the surface 22a of the annular member 22, a gap extending along the thickness direction of the nozzle mount 12 26 is provided.
- variable nozzle mechanism 8 the temperature and flow rate of the exhaust gas change due to start and stop of the engine (not shown) and other load fluctuations, and the hub side wall of the exhaust gas passage 24 (nozzle mount 12 and Even if the temperature distribution in the radial direction in the annular member 22) 28 becomes transiently uneven, the nozzle mount 12 and the annular member 22 thermally expand without being restrained to each other until the gap 26 is filled, so thermal stress is effective.
- both the nozzle mount 12 and the annular member 22 may be formed of a nickel-based alloy, or the annular member 22 which is likely to have a relatively high thermal stress is formed of a nickel-based alloy
- the nozzle mount 12 whose thermal stress is less likely to be relatively high may be formed of stainless steel.
- the inner circumferential surface 12 c of the nozzle mount 12 is provided with a stepped portion 12 c 1 over the entire circumference, and on the surface 12 a side of the stepped portion 12 c 1
- the inner diameter of the nozzle mount 12 is smaller than the inner diameter of the nozzle mount 12 on the back surface 12b side than the stepped portion 12c1.
- a stepped portion 22c1 is provided over the entire circumference of the outer peripheral surface 22c of the annular member 22, and the outer diameter of the annular member 22 on the surface 22a side of the stepped portion 22c1 is on the back surface 22b side of the stepped portion 22c1. Smaller than the outer diameter of the annular member 22 in FIG.
- the stepped portion 22c1 of the annular member 22 abuts against the stepped portion 12c1 of the nozzle mount 12 in the thickness direction of the nozzle mount 12, whereby the annular member 22 is positioned in the thickness direction of the nozzle mount 12 and the exhaust gas passage Falling of the annular member 22 to the side 24 is prevented.
- the annular member 22 has an interference fit portion 32 which is interference-fit to the nozzle mount 12 on the back surface 22 b side of the annular member 22 rather than the gap 26. Thereby, the drop of the annular member 22 from the nozzle mount 12 can be prevented with a simple configuration while securing the gap 26 between the nozzle mount 12 and the annular member 22.
- the interference fit portion 32 is interference fit with the nozzle mount 12 on the back surface 22 b side of the annular member 22 more than the step 12 c 1. Thereby, drop-off
- variable nozzle mechanism 8 further includes a biasing member 34 that biases the annular member 22 toward the step 12 c 1.
- the annular member 22 can be prevented from coming off the nozzle mount 12 while securing the gap 26 between the nozzle mount 12 and the annular member 22.
- a step 22d1 is provided on the inner peripheral surface 22d of the annular member 22, and the inner diameter of the annular member 22 on the surface 22a side of the step 22d1 is a step The inner diameter of the annular member 22 on the back surface 22b side is smaller than 22d1.
- the biasing member 34 is configured such that one end is supported by the bearing housing 6 and the other end is in contact with the step 22 d 1 to bias the annular member 22.
- the annular member 22 can be stably held on the inner peripheral side of the nozzle mount 12.
- an annular spring plate may be used as the biasing member 34.
- the annular member 22 may be formed of a material having a linear expansion coefficient smaller than that of the material forming the nozzle mount 12. good.
- the nozzle mount 12 is formed of stainless steel and the annular member 22 is formed of a nickel-based alloy, the above-described magnitude relation of the linear expansion coefficient holds.
- the above-mentioned gap 26 shown in FIGS. 2 and 3 is not provided.
- the annular member 22 by forming the annular member 22 with a material having a linear expansion coefficient smaller than the linear expansion coefficient of the material forming the nozzle mount 12, fatigue near the inner peripheral edge 12a1 of the nozzle mount 12 The occurrence of damage can be suppressed.
- the linear expansion coefficient of the annular member 22 is made smaller than the linear expansion coefficient of the nozzle mount 12 In some cases, the occurrence of fatigue damage may not be sufficiently suppressed.
- the size (depth) of the gap 26 in the thickness direction of the nozzle mount 12 is, for example, at least 1/10 of the thickness of the nozzle mount 12 (or the size of the annular member 22 in the thickness direction of the nozzle mount). It may be less than one, preferably more than one half and less than three quarters. Further, the size of the gap 26 in the radial direction of the nozzle mount 12 may be, for example, 10 ⁇ m or more, and preferably 50 ⁇ m or more.
- the present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which these embodiments are appropriately combined.
- the nozzle mount 12 not only the nozzle mount 12 but also the nozzle plate 14 is exposed to high temperature exhaust gas with the operation of the engine (not shown), so if the temperature or flow rate of the exhaust gas changes due to engine start / stop or other load fluctuation, The temperature distribution in the radial direction of the nozzle plate 14 transiently becomes uneven.
- the form in which the annular member 22 is inserted on the inner peripheral side of the nozzle plate 14 can suppress the occurrence of fatigue damage in the vicinity of the inner peripheral edge of the nozzle plate 14.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Supercharger (AREA)
- Control Of Turbines (AREA)
Abstract
Description
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
例えば、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
一方、一の構成要素を「備える」、「具える」、「具備する」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。
例えば、ノズルマウント12に限らずノズルプレート14も、不図示のエンジンの運転に伴い高温の排気ガスに晒されるため、エンジンの起動、停止その他の負荷変動によって排気ガスの温度や流量が変化すると、ノズルプレート14の径方向の温度分布が過渡的に不均一になる。このため、ノズルマウント12の場合と同様に、ノズルプレート14の内周側に環状部材22が挿入された形態によって、ノズルプレート14の内周縁付近での疲労損傷の発生を抑制することができる。
4 タービンケーシング
6 軸受ハウジング
8 可変ノズル機構
10 スクロール流路
12 ノズルマウント(環状プレート)
12a 表面
12a1 内周縁
12b 裏面
12b1 内周縁
12c 内周面
12c1 段差部
12h 支持穴
14 ノズルプレート(環状プレート)
16 ノズルベーン
16a 軸部
18 レバープレート
19 ドライブリング
20 ノズルサポート
22 環状部材
22a 表面
22a1 外周縁
22b 裏面
22b1 外周縁
22c 外周面
22c1 段差部
22d 内周面
22d1 段差部
24 排気ガス通路
25 スプリングシール
26 隙間
28 ハブ側壁
30 シュラウド側壁
32 締嵌部
34 付勢部材
36 第2の隙間
100 可変容量型ターボチャージャ
Claims (12)
- 可変容量型ターボチャージャの可変ノズル機構であって、
環状の第1プレートと、
前記第1プレートと対向して配置され、前記第1プレートとの間に排気ガス通路を形成する環状の第2プレートと、
前記第1プレートおよび前記第2プレートの間に回動可能に支持された複数のノズルベーンと、
前記第1プレートの内周側に挿入された環状部材と、
を備え、
前記第1プレートは、前記排気ガス通路に面する表面と、前記表面と反対側の裏面と、を有し、
前記環状部材は、前記排気ガス通路に面する表面と、前記表面と反対側の裏面と、を有し、
前記第1プレートと前記環状部材との間には、前記第1プレートの表面の内周縁と、前記環状部材の表面の外周縁との間から、前記第1プレートの厚さ方向に沿って延在する隙間が設けられた可変ノズル機構。 - 前記環状部材は、前記隙間よりも前記環状部材の前記裏面側に、前記第1プレートに対して締まり嵌めされた締嵌部を有する請求項1に記載の可変ノズル機構。
- 前記第1プレートの内周面には、前記第1プレートの厚さ方向に前記環状部材が突き当たるように構成された段差部が設けられ、
前記締嵌部は、前記段差部よりも前記環状部材の前記裏面側にて前記第1プレートに対して締り嵌めされた請求項2に記載の可変ノズル機構。 - 前記第1プレートの内周面には、前記第1プレートの厚さ方向に前記環状部材が突き当たるように構成された段差部が設けられ、
前記可変ノズル機構は、前記環状部材を前記段差部に向けて付勢する付勢部材を更に有する請求項1に記載の可変ノズル機構。 - 前記第1プレートと前記環状部材との間には、前記第1プレートの裏面の内周縁と、前記環状部材の裏面の外周縁との間から、前記第1プレートの厚さ方向に沿って、前記段差部まで延在する第2の隙間が設けられた請求項4に記載の可変ノズル機構。
- 前記段差部は、前記第1プレートの内周面の全周に亘って設けられる請求項3乃至5の何れか1項に記載の可変ノズル機構。
- 前記第1プレート及び前記環状部材はステンレス鋼で形成された請求項1乃至6の何れか1項に記載の可変ノズル機構。
- 前記第1プレートは、前記排気ガス通路のハブ側壁を構成するノズルマウントであり、
前記第2プレートは、前記排気ガス通路のシュラウド側壁を構成するノズルプレートであり、
第1プレートには、前記複数のノズルベーンの軸部をそれぞれ回動可能に支持するための複数の支持穴が設けられている請求項1乃至7の何れか1項に記載の可変ノズル機構。 - 前記環状部材を形成する材料の線膨張係数は、前記第1プレートを形成する材料の線膨張係数よりも小さい請求項8に記載の可変ノズル機構。
- 前記環状部材はニッケル基合金で形成され、前記第1プレートはステンレス鋼で形成された請求項9に記載の可変ノズル機構。
- 可変容量型ターボチャージャの可変ノズル機構であって、
環状の第1プレートと、
前記第1プレートと対向して配置され、前記第1プレートとの間に排気ガス通路を形成する環状の第2プレートと、
前記第1プレートおよび前記第2プレートの間に回動可能に支持された複数のノズルベーンと、
前記第1プレートの内周側に挿入された環状部材と、
を備え、
前記第1プレートは、前記排気ガス通路のハブ側壁を構成するノズルマウントであり、
前記第2プレートは、前記排気ガス通路のシュラウド側壁を構成するノズルプレートであり、
第1プレートには、前記複数のノズルベーンの軸部をそれぞれ回転可能に支持するための複数の支持穴が設けられており、
前記環状部材を形成する材料の線膨張係数は、前記第1プレートを形成する材料の線膨張係数よりも小さい可変ノズル機構。 - タービンロータと、
前記タービンロータを収容し、エンジンからの排気ガスが流入するスクロール流路を形成するタービンハウジングと、
請求項1乃至11の何れか1項に記載の可変ノズル機構と、
を備え、
前記スクロール流路を通過した排気ガスが前記可変ノズル機構を介して前記タービンロータに供給されるよう構成された可変容量型ターボチャージャ。
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JP2016559773A JP6239787B2 (ja) | 2014-11-21 | 2014-11-21 | 可変ノズル機構および可変容量型ターボチャージャ |
CN201480081563.6A CN106605053B (zh) | 2014-11-21 | 2014-11-21 | 可变喷嘴机构及可变容量式涡轮增压器 |
EP14906614.4A EP3173599B1 (en) | 2014-11-21 | 2014-11-21 | Variable nozzle mechanism and variable displacement turbocharger |
US15/507,109 US20180230851A1 (en) | 2014-11-21 | 2014-11-21 | Variable nozzle mechanism and variable capacity turbocharger |
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US11162412B2 (en) * | 2017-03-24 | 2021-11-02 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Casing for exhaust turbocharger turbine, exhaust turbocharger turbine, and manufacturing method thereof |
US11326615B2 (en) * | 2017-03-17 | 2022-05-10 | Ihi Corporation | Seal structure of variable nozzle unit, and variable capacity type turbocharger |
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DE112019003480B4 (de) * | 2018-07-11 | 2024-01-18 | Ihi Corporation | Turbolader mit einem Mechanismus mit variablem Fassungsvermögen |
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JP6239787B2 (ja) | 2017-11-29 |
JPWO2016079872A1 (ja) | 2017-04-27 |
US20180230851A1 (en) | 2018-08-16 |
EP3173599B1 (en) | 2019-10-02 |
CN106605053B (zh) | 2019-06-04 |
EP3173599A1 (en) | 2017-05-31 |
EP3173599A4 (en) | 2017-08-02 |
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