EP1674668B1 - Variable geometry turbocharger - Google Patents
Variable geometry turbocharger Download PDFInfo
- Publication number
- EP1674668B1 EP1674668B1 EP05028189.8A EP05028189A EP1674668B1 EP 1674668 B1 EP1674668 B1 EP 1674668B1 EP 05028189 A EP05028189 A EP 05028189A EP 1674668 B1 EP1674668 B1 EP 1674668B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- turbine
- housing
- chamber
- link
- variable geometry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
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- 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
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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
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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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
- F05D2260/6022—Drainage of leakage having past a seal
Definitions
- the invention relates to a variable geometry turbocharger according to the preamble of claim 1 or claim 2, the features of which are known from documents WO 2004/063535 or WO 01/69045 .
- variable geometry turbochargers including a mechanism that can accurately control the amount of air supplied to an engine are mainly produced for diesel engines.
- variable geometry turbochargers variable nozzle turbochargers (VN turbochargers), which adjusts turbine speed by varying the orientation of the vanes, are known. Technologies related to such turbochargers are described in, for example, Japanese Patent Application Publication No. JP-A-11-229886 , Japanese Patent Application Publication No. JP-A-2004-169703 , and Japanese Utility Model Application Publication No. 07-25249 .
- JP-A-11-229886 describes providing a seal structure between the plate and the turbine housing in a diesel engine including a VN turbocharger.
- JP-A-2004-169703 describes the structure where exhaust gas flows through a cavity when a movable wall moves.
- Japanese Utility Model Application Publication No. 07-25249 describes the technology of providing a link chamber of a turbocharger with a variable nozzle, on the side opposite a bearing.
- variable geometry turbocharger according to claim 1 or claim 2.
- Advantageous embodiments are carried out according to the dependent claims.
- An aspect of the invention relates to a variable geometry turbocharger including a housing; and a link mechanism that drives the turbine vanes to control the flow of exhaust gas, and that is provided in the housing.
- the housing includes a turbine housing, a turbine-housing swirl chamber for supplying the exhaust gas to a turbine; and a link chamber that houses the link mechanism.
- a communication hole, which provides communication between the turbine-housing swirl chamber and the link chamber, is formed in a lower portion of the turbine housing.
- the presence of the communication hole reduces the difference in pressure between the turbine swirl chamber and the link chamber, and, therefore, the flow of fuel into the link chamber can be minimized. Also, because the high-temperature exhaust gas flows into the link chamber, any fuel present in the link chamber can be vaporized.
- the communication hole may open into the lower portion of the turbine-housing swirl chamber.
- the communication hole is positioned at the lowest portion of the variable geometry turbocharger when the variable geometry turbocharger is mounted in a vehicle.
- the communication hole can also serve as the discharge passage through which.any deposits accumulated in the link chamber are returned to the turbine-housing swirl chamber.
- an exhaust turbine chamber that houses the turbine is formed in the housing, a shroud that separates the exhaust turbine chamber from the link chamber is further provided, and scavenging holes, which provide communication between the exhaust turbine chamber and the link chamber, are formed in the shroud.
- FIGS. 1A and 1B illustrate the cross sectional views of a variable geometry turbocharger according to the first embodiment.
- FIG. 1A illustrates the entirety of the variable geometry turbocharger.
- FIG. 1B illustrates the cross sectional view of a scavenging hole.
- a variable geometry turbocharger 1 according to the first embodiment is a variable nozzle turbocharger, and includes a housing 201; a shaft 7 that is rotatably housed in the housing 201; a compressor wheel 34 and a turbine wheel assembly 22. The compressor wheel 34 and the turbine wheel assembly 22 are attached to the shaft 7.
- the housing 201 is divided into a compressor housing 2, a center housing 36, and a turbine housing 48.
- the compressor housing 2 is attached to one side of the center housing 36, and the turbine housing 48 is attached to the other side of the center housing 36.
- the compressor housing 2 is configured such that air can be taken into the center portion and then discharged to the outside of the compressor housing 2. More specifically, air is introduced into the center portion of the compressor housing 2, the air is made to flow at an increasing speed toward the outside to be compressed by the turning compressor wheel 34, and the compressed air is introduced into an intake manifold (not shown).
- the compressor wheel 34 is housed in the compressor housing 2.
- the compressor wheel 34 is fixed to the shaft 7 serving as a turbine shaft.
- the compressor wheel 34 turns along with the shaft 7.
- the compressor wheel 34 is fixed to the shaft 7 with a locknut 35.
- the compressor wheel 34 is provided with a plurality of vanes. When the compressor wheel 34 turns, the air is made to flow at an increasing speed, due to the centrifugal force, by the vanes and, the air is then compressed.
- a thrust spacer 25 is provided adjacent to the compressor wheel 34.
- the thrust spacer 25 surrounds the shaft 7.
- a back plate 32 is provided on the back-side of the compressor housing 2. The back plate 32 is attached to the compressor housing 2 with bolts 9.
- the thrust spacer 25 is fitted in the back plate 32.
- An 0-ring 8 is provided between the back plate 32 and the compressor housing 2 to form a stronger gas-tight seal therebetween.
- a piston ring 31 is fitted around the thrust spacer 25.
- the center housing 36 is provided at the center portion of the variable geometry turbocharger 1.
- the back plate 32 is fixed to the center housing 36 with a bolt 33.
- a seal ring 27 is provided between the back plate 32 and the center housing 36 to form a stronger gas-tight seal therebetween.
- a thrust bearing 26 contacts the center housing 36.
- the thrust bearing 26 receives the load of the shaft 7 that is applied in the thrust direction.
- the thrust bearing 26 is lubricated with, for example, oil.
- a thrust collar 28 is provided on the inner side of the thrust bearing 26. The thrust collar 28 contacts the thrust spacer 25. The thrust collar 28 also contacts the step portion of the shaft 7.
- a pin 49 is provided in the center housing 36.
- the center housing is provided with a bearing 24 that rotatably supports the shaft 7.
- the bearing 24 receives the load of the shaft that is applied in the radial direction.
- a retainer ring 30 is fitted to the bearing 24.
- the retainer ring 30 is also fitted to the center housing 36.
- the center housing 36 and the turbine housing 48 are provided with a link mechanism 202.
- the link mechanism 202 includes a unison ring 45 that is housed in a link chamber 6; a plurality of arms 44 that is provided on the inner side of the unison ring 45 and that contact the unison ring 45; a nozzle ring 43 that is provided adjacent to the turbine housing 48; and a main arm 37 that is connected to a pin 39 to drive the arms 44.
- the link mechanism 202 controls the orientation of a plurality of vanes 42.
- a pin 40 is turned by a predetermined angle, the turning movement is transmitted to the vanes 42, and the vanes 42 move and the orientation of the vanes 42 is changed.
- the pin 40 is connected to a external crank 41, and the external crank 41 can pivot about a pin 39.
- a bushing 38 is provided around the pin 39.
- the bushing 38 is provided between the pin 39 and the center housing 36.
- the pin 39 is connected to the main arm 37.
- the pin 39 turns, the turning movement is transmitted to the main arm 37.
- the end portion of the main arm 37 on the inner side is fixed to the pin 39.
- the end portion of the main arm 37 on the outer side is fitted to the unison ring 45. Therefore, when the main arm 37 pivots about the pin 39, the pivoting movement is transmitted to the unison ring 45.
- the arms 44 are fitted in the inner surface of the unison ring 45.
- the unison ring 45 turns, the turning movement is transmitted to the arms 44.
- the arms 44 can pivot about the respective pins 21.
- the pivoting movement of the arms 44 is transmitted to the pins 21. Because the pins 21 are connected to the respective vanes 42, the vanes 42 move along with the pins 21 and the arms 44.
- the nozzle ring 43 is fixed to the turbine housing 48 with cap screws 47. Vane spacers 46 are provided around the respective cap screws 47.
- the turbine wheel assembly 22 is attached to the end portion of the shaft 7. The turbine wheel assembly 22 is positioned in an exhaust turbine chamber 148.
- a disk shroud 23 is provided between the turbine wheel assembly 22 and the link chamber 6.
- the disk shroud 23 enhances a gas-tightness of the exhaust turbine chamber 148.
- a piston ring 29 is fitted around the shaft 7.
- a plurality of scavenging holes 4 is formed in the disk shroud 23. The scavenging holes 4 provide communication between the link chamber 6 and the exhaust turbine chamber 148.
- a turbine-housing swirl chamber 5 is provided in the turbine housing 48, and exhaust gas is supplied from the turbine-housing swirl chamber 5. The exhaust gas turns the turbine wheel assembly 22, and is then discharged from the exhaust turbine chamber 148.
- the turbine housing 48 is attached to the center housing 36 with a bolt 10.
- variable geometry turbocharger 1 includes the turbine housing 48 that is a part of the housing 201 for supplying exhaust gas to the turbine wheel assembly 22; and the link mechanism 202 that is provided in the turbine housing 48 and the center housing 36, and that drives the vanes 42 for controlling the flow of the exhaust gas.
- the turbine housing 48 and the center housing 36 have the turbine-housing swirl chamber 5 for supplying exhaust gas to the turbine wheel assembly 22; and the link chamber 6 that houses the link mechanism 202.
- the communication hole 3, which provides communication between the turbine-housing swirl chamber 5 and the link chamber 6, is formed in the turbine housing 48.
- the turbine housing 48 includes the exhaust turbine chamber 148 that houses the turbine wheel assembly 22.
- the exhaust turbine chamber 148 is separated from the link chamber 6 by the disk shroud 23.
- the scavenging holes 4, which provide communication between the exhaust turbine chamber 148 and the link chamber 6, are formed in the disk shroud 23.
- FIG. 2 illustrates the cross sectional view taken along line II-II in FIG. 1 .
- the circular disk-shaped nozzle ring 43 is fitted in the inner side of the ring-shaped unison ring 45.
- the nozzle ring 43 is fixed to the turbine housing 48 with the cap screws 47.
- the vane spacers 46 are provided around the respective cap screws 47.
- the unison ring 45 is slidable with respect to the nozzle ring 43.
- the main arm 37 and the arms 44 are fitted in the respective concave portions formed in the inner surface of the unison ring 45.
- the arms 44 are connected to the respective vanes 42, and the vanes 42 can move to the positions indicated by the dashed lines.
- the flow volume and flow speed of the exhaust gas flowing from the turbine swirl chamber 5 to the exhaust turbine chamber 148 can be controlled by changing the orientation of the vanes 42.
- FIG 3 illustrates the cross sectional view taken along line III-III in FIG. 1 .
- the main arm 37 and the arms 44 are fitted in the concave portions formed in the inner surface of the unison ring 45.
- the pin 39 passes through the nozzle ring 43, and is connected to the main arm 37.
- the unison ring 45 fitted to the main arm 37 turns.
- the arms 44 pivot about the respective pins 21.
- the pins 21 turn, and the turning movement of the pins 21 is transmitted to the vanes 42 in FIG. 2 , causing the vanes 42 to move.
- FIG. 4 illustrates the cross sectional view taken along line IV-IV in FIG. 3 .
- pins 52 are inserted in the nozzle ring 43, and rollers 51 are fitted to the upper portions of the respective pins 52.
- the rollers 51 guide the inner surface of the unison ring 45.
- the unison ring 45 can turn in the predetermined direction while being supported by the rollers 51.
- FIG. 5 illustrates the block diagram of the control system of the variable geometry turbocharger according to the first embodiment.
- the variable geometry turbocharger (variable nozzle turbocharger) 1 is controlled by a variable nozzle controller 200 and an engine control computer 300.
- the engine control computer 300 sets the opening amount of the variable nozzle based on the ON/OFF state of the ignition switch, the accelerator pedal operation amount, the engine speed, the ambient temperature, the ambient pressure, the supercharging pressure, the coolant temperature, and the like.
- the variable nozzle controller 200 receives the data concerning the set opening amount of the variable nozzle, and notifies the variable geometry turbocharger (variable nozzle turbocharger) 1 of the output of a DC motor for driving the nozzle based on the data. Then, the opening amount of the nozzle is set.
- variable nozzle controller 200 The information concerning the opening amount of the nozzle is fed back to the variable nozzle controller 200. Then, a motor status signal is transmitted from the variable nozzle controller 200 to the engine control computer 300.
- variable geometry turbocharger 1 the flow speed and pressure of the exhaust gas supplied to the turbocharger are controlled by adjusting the orientation of the vanes 42, serving as the variable nozzle provided around the turbine wheel assembly 22, by using the motor.
- the balance between the backpressure and the supercharging pressure can be optimally controlled in accordance with the engine speed and the engine load.
- the variable geometry turbocharger 1 includes the nozzle (vanes 42), the DC motor (not shown), the link mechanism 202 that connects the vanes 42 to the DC motor, and an opening amount sensor (not shown).
- the drive force generated by the DC motor is transmitted to the pin 40, the pin 39, the main arm 37, the unison ring 45, the arms 44 and the pins 21, in this order.
- the vanes 42 may be controlled in various methods. For example, when the engine is running at a low or medium speed, the increasing rate of the supercharging pressure and the supercharging pressure are increased by controlling the orientation of the vanes 42 such that the vanes 42 are closed to increase the flow speed of the exhaust gas. Accordingly, generation of soot can be suppressed, and the torque can be increased.
- the orientation of the vanes 42 is controlled such that the vanes 42 are opened to decrease the pressure of the exhaust gas. Accordingly, the fuel efficiency and the output can be increased, and overspeed of the turbine wheel assembly 22 can be prevented. Also, while the exhaust gas is re-circulated, the orientation of the vanes 42 is controlled to stabilize the EGR control.
- variable geometry turbocharger 1 the flow of fuel through the clearance formed between the turbine housing 48 and the nozzle ring 43 is minimized.
- the fuel is injected into the exhaust gas at a position upstream of the turbine-housing swirl chamber 5, and used to burn the particulate matter accumulated in a DPNR (Diesel Particulate and NOx Reduction System) provided downstream of the exhaust turbine chamber 148.
- DPNR Diesel Particulate and NOx Reduction System
- the communication hole 3 which provides communication between the turbine-housing swirl chamber 5 and the link chamber 6, is formed in the lower portion of the turbine housing 48, the difference in pressure between the turbine-housing swirl chamber 5 and the link chamber 6 is reduced. Any number of the communication holes 3 may be formed as appropriate.
- the position and size of the communication hole 3 are set based on the area of the clearance formed between the nozzle ring 43 and the turbine housing 48.
- the communication hole 3 is formed in the portion of the surface of the turbine-housing swirl chamber 5, where the least amount of fuel adheres.
- the scavenging holes 4 are formed in the disk shroud 23, and the gas is made to flow to the back-side of the turbine from the turbine-housing swirl chamber 5 toward the link chamber 6.
- the number of the scavenging holes 4 may be, for example, three, and the scavenging holes 4 may be formed at intervals of, for example, 120 degrees.
- the temperature in the link chamber 6 can be increased by the gas flowing through the scavenging holes 4.
- the deposit in the link chamber 6 can be burned or peeled off.
- the communication hole 3, which provides communication between the link chamber 6 and the turbine-housing swirl chamber 5, is formed. It is preferable to form two or more communication holes 3, because the exhaust gas flows more efficiently, and does not stagnate easily.
- the presence of the communication hole 3 and the scavenging holes 4 minimizes the difference in pressure between the turbine-housing swirl chamber 5 and the link chamber 6.
- the flow of fuel into the link chamber 6 is minimized.
- any fuel that flowed into the link chamber 6 would be vaporized by the high-temperature exhaust gas flowing into the link chamber 6 through the communication hole 3 and the scavenging holes 4.
- the scavenging holes 4 are not necessarily formed. Only the communication hole 3 may be formed without forming the scavenging holes 4.
- FIG. 6 illustrates the cross sectional view of a variable geometry turbocharger according to the second embodiment.
- the communication hole 3 opens into the lower portion of the turbine-housing swirl chamber 5. Namely, the communication hole 3 extends toward the lower portion of the turbine-housing swirl chamber 5.
- the communication hole 3 is positioned in the lowest portion, namely, the portion of the variable geometry turbocharger 1, which is closest to the ground surface.
- the fuel flowing into the link chamber 6 flows down to the turbine-housing swirl chamber 5 through the communication hole 3. Accordingly, the fuel does not accumulate in the link chamber 6, and formation of sludge in the link chamber 6 can be minimized. Also, because the communication hole 3 is positioned in the lowest portion when the variable geometry turbocharger 1 is mounted in the vehicle, the communication hole 3 also serves as the discharge passage through which any deposit peeled off from the link chamber 6 is returned to the turbine-housing swirl chamber 5.
- FIG. 7 illustrates the plan view of a variable geometry turbocharger according to the third embodiment.
- a discharge hole through which the accumulated fuel is discharged to the inlet of the turbine, is formed in the lower portion of the turbine-housing swirl chamber 5.
- the discharge hole 149 is formed at an angle at which the dynamic pressure of the gas flow at the inlet portion of the turbine is not applied to the discharge hole 149.
- variable geometry turbocharger 1 according to the invention is mainly mounted in a vehicle provided with a diesel engine.
- the variable geometry turbocharger 1 according to the invention may be mounted in a vehicle provided with a gasoline engine or a rotary engine.
- the invention may be applied to a hybrid vehicle using a diesel engine or a gasoline engine.
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Description
- The invention relates to a variable geometry turbocharger according to the preamble of
claim 1 orclaim 2, the features of which are known from documentsWO 2004/063535 orWO 01/69045 - Currently, variable geometry turbochargers (VG turbochargers) including a mechanism that can accurately control the amount of air supplied to an engine are mainly produced for diesel engines.
- One type of such variable geometry turbochargers, variable nozzle turbochargers (VN turbochargers), which adjusts turbine speed by varying the orientation of the vanes, are known. Technologies related to such turbochargers are described in, for example, Japanese Patent Application Publication No.
JP-A-11-229886 JP-A-2004-169703 07-25249 - Japanese Patent Application Publication No.
JP-A-11-229886 - Japanese Patent Application Publication No.
JP-A-2004-169703 - Japanese Utility Model Application Publication No.
07-25249 - In the above-mentioned technologies, however, fuel, gas, and the like flow into the link chamber through a clearance formed around a pin for operating the nozzle, due to a difference in pressure between the turbine swirl chamber and the link chamber. This may raise a problem that the accumulated fuel and gas inhibits sliding of a unison ring, resulting in reduction in controllability.
- It is an object of the invention to further develop a variable geometry turbocharger according to the preamble of
claim - The object of the invention is achieved by a variable geometry turbocharger according to
claim 1 orclaim 2. Advantageous embodiments are carried out according to the dependent claims. - An aspect of the invention relates to a variable geometry turbocharger including a housing; and a link mechanism that drives the turbine vanes to control the flow of exhaust gas, and that is provided in the housing. The housing includes a turbine housing, a turbine-housing swirl chamber for supplying the exhaust gas to a turbine; and a link chamber that houses the link mechanism. A communication hole, which provides communication between the turbine-housing swirl chamber and the link chamber, is formed in a lower portion of the turbine housing.
- In the thus configured variable geometry turbocharger, the presence of the communication hole reduces the difference in pressure between the turbine swirl chamber and the link chamber, and, therefore, the flow of fuel into the link chamber can be minimized. Also, because the high-temperature exhaust gas flows into the link chamber, any fuel present in the link chamber can be vaporized.
- In the above-mentioned aspect, the communication hole may open into the lower portion of the turbine-housing swirl chamber. With this configuration, fuel flowing into the link chamber flows down to the turbine-housing swirl chamber through the communication hole. Accordingly, the accumulation of fuel in the link chamber can be prevented, and, therefore, formation of sludge in the link chamber can be prevented.
- In the above-mentioned aspect, the communication hole is positioned at the lowest portion of the variable geometry turbocharger when the variable geometry turbocharger is mounted in a vehicle. With this configuration, the communication hole can also serve as the discharge passage through which.any deposits accumulated in the link chamber are returned to the turbine-housing swirl chamber.
- In the above-mentioned aspect, an exhaust turbine chamber that houses the turbine is formed in the housing, a shroud that separates the exhaust turbine chamber from the link chamber is further provided, and scavenging holes, which provide communication between the exhaust turbine chamber and the link chamber, are formed in the shroud. With this configuration, the high-temperature exhaust gas introduced through the communication hole can easily flow into the link chamber through the scavenging holes. Accordingly, the temperature in the link chamber can be increased, and, therefore, the deposit in the link chamber can be burned or peeled off.
- The foregoing and further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings, wherein the same or corresponding portions are denoted by the same reference numerals, and wherein:
-
FIG. 1A illustrates the cross sectional view of a variable geometry turbocharger in its entirety according to a first embodiment of the invention, andFIG. 1B illustrates the cross sectional view of a scavenging hole; -
FIG. 2 illustrates the cross sectional view taken along line II-II inFIG. 1 ; -
FIG. 3 illustrates the cross sectional view taken along line III-III inFIG 1 ; -
FIG. 4 illustrates the cross sectional view taken along line IV-IV inFIG. 3 ; -
FIG. 5 illustrates the block diagram of a control system of the variable geometry turbocharger according to the first embodiment of the invention; -
FIG 6 illustrates the cross sectional view of a variable geometry turbocharger according to a second embodiment of the invention; and -
FIG. 7 illustrates the plan view of a variable geometry turbocharger according to a third embodiment of the invention. - Hereafter, embodiments of the invention will be described in detail with reference to accompanying drawings. Note that, in the following embodiments, the same or corresponding portions will be denoted by the same reference numerals, and will be described only once.
- Hereafter, a first embodiment of the invention will be described in detail.
FIGS. 1A and 1B illustrate the cross sectional views of a variable geometry turbocharger according to the first embodiment.FIG. 1A illustrates the entirety of the variable geometry turbocharger.FIG. 1B illustrates the cross sectional view of a scavenging hole. As shown inFIG. 1 , avariable geometry turbocharger 1 according to the first embodiment is a variable nozzle turbocharger, and includes ahousing 201; ashaft 7 that is rotatably housed in thehousing 201; acompressor wheel 34 and aturbine wheel assembly 22. Thecompressor wheel 34 and theturbine wheel assembly 22 are attached to theshaft 7. - The
housing 201 is divided into acompressor housing 2, a center housing 36, and aturbine housing 48. Thecompressor housing 2 is attached to one side of the center housing 36, and theturbine housing 48 is attached to the other side of the center housing 36. Thecompressor housing 2 is configured such that air can be taken into the center portion and then discharged to the outside of thecompressor housing 2. More specifically, air is introduced into the center portion of thecompressor housing 2, the air is made to flow at an increasing speed toward the outside to be compressed by the turningcompressor wheel 34, and the compressed air is introduced into an intake manifold (not shown). - The
compressor wheel 34 is housed in thecompressor housing 2. Thecompressor wheel 34 is fixed to theshaft 7 serving as a turbine shaft. Thecompressor wheel 34 turns along with theshaft 7. Thecompressor wheel 34 is fixed to theshaft 7 with a locknut 35. Thecompressor wheel 34 is provided with a plurality of vanes. When thecompressor wheel 34 turns, the air is made to flow at an increasing speed, due to the centrifugal force, by the vanes and, the air is then compressed. - A
thrust spacer 25 is provided adjacent to thecompressor wheel 34. Thethrust spacer 25 surrounds theshaft 7. Aback plate 32 is provided on the back-side of thecompressor housing 2. Theback plate 32 is attached to thecompressor housing 2 withbolts 9. In addition, thethrust spacer 25 is fitted in theback plate 32. An 0-ring 8 is provided between theback plate 32 and thecompressor housing 2 to form a stronger gas-tight seal therebetween. Apiston ring 31 is fitted around thethrust spacer 25. - The center housing 36 is provided at the center portion of the
variable geometry turbocharger 1. Theback plate 32 is fixed to the center housing 36 with abolt 33. Aseal ring 27 is provided between theback plate 32 and the center housing 36 to form a stronger gas-tight seal therebetween. - A thrust bearing 26 contacts the center housing 36. The
thrust bearing 26 receives the load of theshaft 7 that is applied in the thrust direction. Thethrust bearing 26 is lubricated with, for example, oil. Athrust collar 28 is provided on the inner side of thethrust bearing 26. Thethrust collar 28 contacts thethrust spacer 25. Thethrust collar 28 also contacts the step portion of theshaft 7. - A
pin 49 is provided in the center housing 36. The center housing is provided with abearing 24 that rotatably supports theshaft 7. Thebearing 24 receives the load of the shaft that is applied in the radial direction. - A
retainer ring 30 is fitted to thebearing 24. Theretainer ring 30 is also fitted to the center housing 36. - The center housing 36 and the
turbine housing 48 are provided with alink mechanism 202. Thelink mechanism 202 includes aunison ring 45 that is housed in alink chamber 6; a plurality ofarms 44 that is provided on the inner side of theunison ring 45 and that contact theunison ring 45; anozzle ring 43 that is provided adjacent to theturbine housing 48; and amain arm 37 that is connected to apin 39 to drive thearms 44. - The
link mechanism 202 controls the orientation of a plurality ofvanes 42. When apin 40 is turned by a predetermined angle, the turning movement is transmitted to thevanes 42, and thevanes 42 move and the orientation of thevanes 42 is changed. More specifically, thepin 40 is connected to aexternal crank 41, and the external crank 41 can pivot about apin 39. A bushing 38 is provided around thepin 39. The bushing 38 is provided between thepin 39 and the center housing 36. - The
pin 39 is connected to themain arm 37. When thepin 39 turns, the turning movement is transmitted to themain arm 37. The end portion of themain arm 37 on the inner side is fixed to thepin 39. The end portion of themain arm 37 on the outer side is fitted to theunison ring 45. Therefore, when themain arm 37 pivots about thepin 39, the pivoting movement is transmitted to theunison ring 45. Thearms 44 are fitted in the inner surface of theunison ring 45. When theunison ring 45 turns, the turning movement is transmitted to thearms 44. Thearms 44 can pivot about the respective pins 21. The pivoting movement of thearms 44 is transmitted to thepins 21. Because thepins 21 are connected to therespective vanes 42, thevanes 42 move along with thepins 21 and thearms 44. - The
nozzle ring 43 is fixed to theturbine housing 48 with cap screws 47.Vane spacers 46 are provided around the respective cap screws 47. Theturbine wheel assembly 22 is attached to the end portion of theshaft 7. Theturbine wheel assembly 22 is positioned in anexhaust turbine chamber 148. - A
disk shroud 23 is provided between theturbine wheel assembly 22 and thelink chamber 6. Thedisk shroud 23 enhances a gas-tightness of theexhaust turbine chamber 148. To enhance the gas-tightness, apiston ring 29 is fitted around theshaft 7. A plurality of scavengingholes 4 is formed in thedisk shroud 23. The scavenging holes 4 provide communication between thelink chamber 6 and theexhaust turbine chamber 148. - A turbine-
housing swirl chamber 5 is provided in theturbine housing 48, and exhaust gas is supplied from the turbine-housing swirl chamber 5. The exhaust gas turns theturbine wheel assembly 22, and is then discharged from theexhaust turbine chamber 148. Acommunication hole 3, which provides communication between the turbine-housing swirl chamber 5 and thelink chamber 6, is formed in theturbine housing 48. Due to the presence of thecommunication hole 3, the pressure in the turbine-housing swirl chamber 5 becomes substantially equal to the pressure in thelink chamber 6. Theturbine housing 48 is attached to the center housing 36 with abolt 10. - As described so far, the
variable geometry turbocharger 1 includes theturbine housing 48 that is a part of thehousing 201 for supplying exhaust gas to theturbine wheel assembly 22; and thelink mechanism 202 that is provided in theturbine housing 48 and the center housing 36, and that drives thevanes 42 for controlling the flow of the exhaust gas. - The
turbine housing 48 and the center housing 36 have the turbine-housing swirl chamber 5 for supplying exhaust gas to theturbine wheel assembly 22; and thelink chamber 6 that houses thelink mechanism 202. Thecommunication hole 3, which provides communication between the turbine-housing swirl chamber 5 and thelink chamber 6, is formed in theturbine housing 48. Theturbine housing 48 includes theexhaust turbine chamber 148 that houses theturbine wheel assembly 22. Theexhaust turbine chamber 148 is separated from thelink chamber 6 by thedisk shroud 23. The scavenging holes 4, which provide communication between theexhaust turbine chamber 148 and thelink chamber 6, are formed in thedisk shroud 23. -
FIG. 2 illustrates the cross sectional view taken along line II-II inFIG. 1 . As shown inFIG. 2 , the circular disk-shapednozzle ring 43 is fitted in the inner side of the ring-shapedunison ring 45. Thenozzle ring 43 is fixed to theturbine housing 48 with the cap screws 47. The vane spacers 46 are provided around the respective cap screws 47. - The
unison ring 45 is slidable with respect to thenozzle ring 43. Themain arm 37 and thearms 44 are fitted in the respective concave portions formed in the inner surface of theunison ring 45. Thearms 44 are connected to therespective vanes 42, and thevanes 42 can move to the positions indicated by the dashed lines. The flow volume and flow speed of the exhaust gas flowing from theturbine swirl chamber 5 to theexhaust turbine chamber 148 can be controlled by changing the orientation of thevanes 42. -
FIG 3 illustrates the cross sectional view taken along line III-III inFIG. 1 . As shown inFIG. 3 , themain arm 37 and thearms 44 are fitted in the concave portions formed in the inner surface of theunison ring 45. Thepin 39 passes through thenozzle ring 43, and is connected to themain arm 37. When themain arm 37 pivots about thepin 39, theunison ring 45 fitted to themain arm 37 turns. As theunison ring 45 turns, thearms 44 pivot about the respective pins 21. Thepins 21 turn, and the turning movement of thepins 21 is transmitted to thevanes 42 inFIG. 2 , causing thevanes 42 to move. -
FIG. 4 illustrates the cross sectional view taken along line IV-IV inFIG. 3 . As shown inFIG. 4 , pins 52 are inserted in thenozzle ring 43, androllers 51 are fitted to the upper portions of the respective pins 52. Therollers 51 guide the inner surface of theunison ring 45. Thus, theunison ring 45 can turn in the predetermined direction while being supported by therollers 51. -
FIG. 5 illustrates the block diagram of the control system of the variable geometry turbocharger according to the first embodiment. As shown inFIG. 5 , the variable geometry turbocharger (variable nozzle turbocharger) 1 is controlled by avariable nozzle controller 200 and anengine control computer 300. - More specifically, the
engine control computer 300 sets the opening amount of the variable nozzle based on the ON/OFF state of the ignition switch, the accelerator pedal operation amount, the engine speed, the ambient temperature, the ambient pressure, the supercharging pressure, the coolant temperature, and the like. Thevariable nozzle controller 200 receives the data concerning the set opening amount of the variable nozzle, and notifies the variable geometry turbocharger (variable nozzle turbocharger) 1 of the output of a DC motor for driving the nozzle based on the data. Then, the opening amount of the nozzle is set. - The information concerning the opening amount of the nozzle is fed back to the
variable nozzle controller 200. Then, a motor status signal is transmitted from thevariable nozzle controller 200 to theengine control computer 300. - In the
variable geometry turbocharger 1, the flow speed and pressure of the exhaust gas supplied to the turbocharger are controlled by adjusting the orientation of thevanes 42, serving as the variable nozzle provided around theturbine wheel assembly 22, by using the motor. Thus, the balance between the backpressure and the supercharging pressure can be optimally controlled in accordance with the engine speed and the engine load. - The
variable geometry turbocharger 1 includes the nozzle (vanes 42), the DC motor (not shown), thelink mechanism 202 that connects thevanes 42 to the DC motor, and an opening amount sensor (not shown). The drive force generated by the DC motor is transmitted to thepin 40, thepin 39, themain arm 37, theunison ring 45, thearms 44 and thepins 21, in this order. Thevanes 42 may be controlled in various methods. For example, when the engine is running at a low or medium speed, the increasing rate of the supercharging pressure and the supercharging pressure are increased by controlling the orientation of thevanes 42 such that thevanes 42 are closed to increase the flow speed of the exhaust gas. Accordingly, generation of soot can be suppressed, and the torque can be increased. In contrast to this, when the engine is running at a high speed, the orientation of thevanes 42 is controlled such that thevanes 42 are opened to decrease the pressure of the exhaust gas. Accordingly, the fuel efficiency and the output can be increased, and overspeed of theturbine wheel assembly 22 can be prevented. Also, while the exhaust gas is re-circulated, the orientation of thevanes 42 is controlled to stabilize the EGR control. - In the
variable geometry turbocharger 1 according to the first embodiment, the flow of fuel through the clearance formed between theturbine housing 48 and thenozzle ring 43 is minimized. The fuel is injected into the exhaust gas at a position upstream of the turbine-housing swirl chamber 5, and used to burn the particulate matter accumulated in a DPNR (Diesel Particulate and NOx Reduction System) provided downstream of theexhaust turbine chamber 148. Because thecommunication hole 3, which provides communication between the turbine-housing swirl chamber 5 and thelink chamber 6, is formed in the lower portion of theturbine housing 48, the difference in pressure between the turbine-housing swirl chamber 5 and thelink chamber 6 is reduced. Any number of the communication holes 3 may be formed as appropriate. - The position and size of the
communication hole 3 are set based on the area of the clearance formed between thenozzle ring 43 and theturbine housing 48. Thecommunication hole 3 is formed in the portion of the surface of the turbine-housing swirl chamber 5, where the least amount of fuel adheres. The scavenging holes 4 are formed in thedisk shroud 23, and the gas is made to flow to the back-side of the turbine from the turbine-housing swirl chamber 5 toward thelink chamber 6. The number of the scavenging holes 4 may be, for example, three, and the scavenging holes 4 may be formed at intervals of, for example, 120 degrees. The temperature in thelink chamber 6 can be increased by the gas flowing through the scavenging holes 4. - In the first embodiment, the deposit in the
link chamber 6 can be burned or peeled off. To burn or peel off the deposit, thecommunication hole 3, which provides communication between thelink chamber 6 and the turbine-housing swirl chamber 5, is formed. It is preferable to form two ormore communication holes 3, because the exhaust gas flows more efficiently, and does not stagnate easily. As described so far, in thevariable geometry turbocharger 1 according to the first embodiment, the presence of thecommunication hole 3 and the scavenging holes 4 minimizes the difference in pressure between the turbine-housing swirl chamber 5 and thelink chamber 6. Thus, the flow of fuel into thelink chamber 6 is minimized. Furthermore, any fuel that flowed into thelink chamber 6 would be vaporized by the high-temperature exhaust gas flowing into thelink chamber 6 through thecommunication hole 3 and the scavenging holes 4. - The scavenging holes 4 are not necessarily formed. Only the
communication hole 3 may be formed without forming the scavenging holes 4. - Hereafter, a second embodiment of the invention will be described in detail.
FIG. 6 illustrates the cross sectional view of a variable geometry turbocharger according to the second embodiment. As shown inFIG. 6 , in avariable geometry turbocharger 1 according to the second embodiment, thecommunication hole 3 opens into the lower portion of the turbine-housing swirl chamber 5. Namely, thecommunication hole 3 extends toward the lower portion of the turbine-housing swirl chamber 5. When thevariable geometry turbocharger 1 is mounted in the vehicle, thecommunication hole 3 is positioned in the lowest portion, namely, the portion of thevariable geometry turbocharger 1, which is closest to the ground surface. - In the thus configured
variable geometry turbocharger 1 according to the second embodiment, the fuel flowing into thelink chamber 6 flows down to the turbine-housing swirl chamber 5 through thecommunication hole 3. Accordingly, the fuel does not accumulate in thelink chamber 6, and formation of sludge in thelink chamber 6 can be minimized. Also, because thecommunication hole 3 is positioned in the lowest portion when thevariable geometry turbocharger 1 is mounted in the vehicle, thecommunication hole 3 also serves as the discharge passage through which any deposit peeled off from thelink chamber 6 is returned to the turbine-housing swirl chamber 5. - Hereafter, a third embodiment of the invention will be described in detail.
FIG. 7 illustrates the plan view of a variable geometry turbocharger according to the third embodiment. As shown inFIG. 7 , in avariable geometry turbocharger 1 according to the third embodiment, a discharge hole, through which the accumulated fuel is discharged to the inlet of the turbine, is formed in the lower portion of the turbine-housing swirl chamber 5. Thus, the flow of fuel from the turbine-housing swirl chamber 5 to thelink chamber 6 is minimized. Thedischarge hole 149 is formed at an angle at which the dynamic pressure of the gas flow at the inlet portion of the turbine is not applied to thedischarge hole 149. - While the invention has been described in detail with reference to the preferred embodiments, the embodiments may be modified in various manners. First, the
variable geometry turbocharger 1 according to the invention is mainly mounted in a vehicle provided with a diesel engine. However, thevariable geometry turbocharger 1 according to the invention may be mounted in a vehicle provided with a gasoline engine or a rotary engine. Also, the invention may be applied to a hybrid vehicle using a diesel engine or a gasoline engine. - The embodiment of the invention that has been disclosed in the specification is to be considered in all respects as illustrative and not restrictive. The technical scope of the invention is defined by claims, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (3)
- A variable geometry turbocharger (1) including a housing (201), and a link mechanism (202), provided in the housing (201), which drives vanes (42) for controlling a flow of exhaust gas, the housing (201) including a turbine housing (48) and a turbine-housing swirl chamber (5) for supplying the exhaust gas to a turbine (22) and a link chamber (6) that houses the link mechanism (202),
characterized in that
a communication hole (3), which provides communication between the turbine-housing swirl chamber (5) and the link chamber (6), is formed in a lower portion of the turbine housing (48) and positioned at a lowest portion of the turbine-housing swirl chamber (5) when the variable geometry turbocharger (1) is mounted in a vehicle. - A variable geometry turbocharger (1) including a housing (201), and a link mechanism (202), provided in the housing (201), which drives vanes (42) for controlling a flow of exhaust gas, the housing (201) including a turbine housing (48) and a turbine-housing swirl chamber (5) for supplying the exhaust gas to a turbine (22) and a link chamber (6) that houses the link mechanism (202),
characterized in that
a communication hole (3), which provides communication between the turbine-housing swirl chamber (5) and the link chamber (6), is formed in a lower portion of the turbine housing (48) when the variable geometry turbocharger (1) is mounted in a vehicle, and
an exhaust turbine chamber (148) that houses the turbine (22) is formed in the housing (201), a shroud (23) that separates the exhaust turbine chamber (148) from the link chamber (6) is further provided, and scavenging holes (4), which provide communication between the exhaust turbine chamber (148) and the link chamber (6), are formed in the shroud (23). - The variable geometry turbocharger according to claim 1 or 2, wherein
the communication hole (3) is formed obliquely downward to open into a lower portion of the turbine-housing swirl chamber (5).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004373934A JP4483571B2 (en) | 2004-12-24 | 2004-12-24 | Variable capacity turbocharger |
Publications (3)
Publication Number | Publication Date |
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EP1674668A2 EP1674668A2 (en) | 2006-06-28 |
EP1674668A3 EP1674668A3 (en) | 2012-03-07 |
EP1674668B1 true EP1674668B1 (en) | 2015-10-14 |
Family
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EP05028189.8A Expired - Fee Related EP1674668B1 (en) | 2004-12-24 | 2005-12-22 | Variable geometry turbocharger |
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EP (1) | EP1674668B1 (en) |
JP (1) | JP4483571B2 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7908858B2 (en) | 2007-07-31 | 2011-03-22 | Caterpillar Inc. | System that limits turbo speed by controlling fueling |
JP5093758B2 (en) * | 2008-03-19 | 2012-12-12 | 株式会社Ihi | Variable capacity turbocharger |
JP5527306B2 (en) * | 2011-11-04 | 2014-06-18 | トヨタ自動車株式会社 | Variable capacity turbocharger |
JP5966786B2 (en) | 2012-09-10 | 2016-08-10 | 株式会社Ihi | Variable capacity turbocharger |
JP5967062B2 (en) * | 2013-12-09 | 2016-08-10 | トヨタ自動車株式会社 | Turbocharger |
WO2017175615A1 (en) * | 2016-04-04 | 2017-10-12 | 株式会社Ihi | Variable nozzle unit, supercharger, and method for manufacturing variable nozzle unit |
WO2020075370A1 (en) | 2018-10-09 | 2020-04-16 | 株式会社Ihi | Variable geometry mechanism and supercharger |
JP7074091B2 (en) * | 2019-01-31 | 2022-05-24 | 株式会社豊田自動織機 | Turbocharger |
JP7477048B2 (en) | 2021-04-20 | 2024-05-01 | 株式会社Ihi | Variable Geometry Turbocharger |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2001069045A1 (en) | 2000-03-13 | 2001-09-20 | Alliedsignal Inc. | Variable geometry turbocharger |
WO2004063535A1 (en) | 2003-01-10 | 2004-07-29 | Honeywell International Inc. | Sealing means for a lubrication system in a turbocharger |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0725249U (en) | 1993-10-20 | 1995-05-12 | 石川島播磨重工業株式会社 | Supercharger with variable capacity nozzle |
JPH11229886A (en) | 1998-02-13 | 1999-08-24 | Taiho Kogyo Co Ltd | Turbocharger sealing unit |
DE10014810A1 (en) * | 2000-03-27 | 2001-10-11 | Abb Turbo Systems Ag Baden | Exhaust gas turbocharger radial turbine for internal combustion engine; has turbine wheel and flow channel for working medium and has separating wall between turbine and bearing casings |
GB0226943D0 (en) | 2002-11-19 | 2002-12-24 | Holset Engineering Co | Variable geometry turbine |
WO2006015613A1 (en) * | 2004-08-12 | 2006-02-16 | Honeywell International Inc. | Turbocharger |
-
2004
- 2004-12-24 JP JP2004373934A patent/JP4483571B2/en not_active Expired - Fee Related
-
2005
- 2005-12-22 EP EP05028189.8A patent/EP1674668B1/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001069045A1 (en) | 2000-03-13 | 2001-09-20 | Alliedsignal Inc. | Variable geometry turbocharger |
WO2004063535A1 (en) | 2003-01-10 | 2004-07-29 | Honeywell International Inc. | Sealing means for a lubrication system in a turbocharger |
Non-Patent Citations (1)
Title |
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"Beweismaterial VTG Entwässerungsbohrung", BOSCH MAIN TURBO SYSTEMS, 1 July 2016 (2016-07-01), pages 1 - 14, XP055295558 |
Also Published As
Publication number | Publication date |
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JP4483571B2 (en) | 2010-06-16 |
JP2006177318A (en) | 2006-07-06 |
EP1674668A3 (en) | 2012-03-07 |
EP1674668A2 (en) | 2006-06-28 |
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