JP2017223152A - Waist gate valve and turbocharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waist gate valve capable of suppressing the adhesion of a valve seat and a valve plate, and the deterioration of turbine efficiency.SOLUTION: A waist gate valve for opening/closing a bypass passage bypassing an exhaust turbine of a turbocharger, includes: a valve seat which has at least one through-hole; a valve plate which is disposed adjacent to the valve seat and has at least one through-hole; a first actuator; a drive transmission unit which is provided on the opposite side to the valve seat across the valve plate, and is configured to transmit the driving force of the first actuator to a first part of the valve plate to rotate the valve plate; and an energizing unit which is configured to energize a second part positioned at a different position from the first part in a rotating direction of the valve plate in the valve plate, to a valve seat side.SELECTED DRAWING: Figure 9

Description

  The present disclosure relates to waste gate valves and turbochargers.

  A turbocharger may be provided with a waste gate valve as means for suppressing an excessive increase in supercharging pressure. The waste gate valve adjusts the amount of exhaust gas flowing into the exhaust turbine by opening and closing a bypass passage that bypasses the exhaust turbine of the turbocharger. The exhaust gas that has passed through the waste gate valve flows into the catalyst on the downstream side of the exhaust turbine without contributing to the turbine drive, so the temperature of the catalyst can be raised to activate the catalyst, and the exhaust gas can be cleaned. Can be promoted.

  In the turbocharger described in Patent Document 1, a rotary slide valve is adopted as one form of a waste gate valve. The waste gate valve described in Patent Document 1 includes a valve seat having a plurality of through holes, a valve plate disposed adjacent to the valve seat and having a plurality of through holes, an actuator, and the valve plate. A drive transmission unit provided on the opposite side of the seat and configured to transmit the driving force of the actuator to the valve plate to rotate the valve plate;

  This type of waste gate valve is configured to adjust the valve opening by rotating the valve plate to change the area where the through hole of the valve plate and the through hole of the valve seat overlap.

US Patent Application Publication No. 2005/0004020

  In the waste gate valve described in Patent Document 1, only the upper portion of the valve plate is supported by the arm of the drive transmission unit, and is configured to slide left and right by a shaft connected to the arm. For this reason, when thermal expansion occurs on the shaft or when an axial load is applied from the compressor side, the valve plate is pushed toward the valve seat side and tilted, so that only the upper part of the valve plate supported by the arm is There is a possibility that the valve seat will come into contact with each other, causing abnormal wear and sticking.

  In order to prevent sticking, a large clearance may be provided between the valve seat and the valve plate. However, there is a concern that the turbine efficiency may be reduced due to a leakage flow from the clearance.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a waste gate valve capable of suppressing adhesion between a valve seat and a valve plate and a decrease in turbine efficiency, and the same. Is to provide a turbocharger comprising

  (1) A waste gate valve according to at least one embodiment of the present invention is a waste gate valve for opening and closing a bypass passage that bypasses an exhaust turbine of a turbocharger, and includes a valve seat having at least one through hole; A valve plate disposed adjacent to the valve seat and having at least one through hole, at least one actuator, and provided on the opposite side of the valve seat across the valve plate, A drive transmission unit configured to transmit to the first part of the valve plate to rotate the valve plate; and a position of the valve plate different from the first part in the rotational direction of the valve plate. The second part is urged toward the valve seat Comprising a biasing unit configured, the.

  In the waste gate valve described in (1) above, during operation of the turbocharger, the axial load that presses the valve plate against the valve seat due to the thermal expansion of the drive transmission unit causes the first load of the valve plate from the drive transmission unit. Acts on the site. Even in such a case, since the second part at a position different from the first part in the rotation direction of the valve plate is urged to the valve seat side by the urging unit, it is one point as in Patent Document 1. Compared with the structure that supports the valve plate, the valve plate can be pressed evenly (relatively uniformly) against the valve seat during operation of the turbocharger. Thereby, the inclination to the valve seat side of the valve plate resulting from the thermal expansion of the drive transmission unit can be suppressed.

  Therefore, since it is possible to suppress the contact of the valve plate with the valve seat during operation of the turbocharger without providing a large clearance between the valve seat and the valve plate, it is possible to prevent the valve seat and the valve plate from sticking and reduce the turbine efficiency. Can be suppressed.

  (2) In some embodiments, in the waste gate valve according to the above (1), the urging unit includes an elastic member, and the first portion of the valve plate in the rotation direction of the valve plate. The second portion at a position different from the above is configured to be biased toward the valve seat by the elastic force of the elastic member.

  In the waste gate valve described in (2) above, even if the axial load that presses the valve plate against the valve seat due to thermal expansion of the drive transmission unit acts on the valve plate from the drive transmission unit, Since the second part at a position different from the first part in the rotation direction of the plate is urged toward the valve seat by the elastic force of the elastic member, the valve seat side of the valve plate caused by the thermal expansion of the drive transmission unit The inclination to can be suppressed. Therefore, sticking of the valve seat and the valve plate and a decrease in turbine efficiency can be suppressed.

  (3) In some embodiments, in the waste gate valve according to the above (1) or (2), the drive transmission unit intersects the valve plate on the opposite side of the valve seat with the valve plate interposed therebetween. And a drive transmission shaft extending in a direction in which the drive force of the first actuator is transmitted to the valve plate via the drive transmission shaft.

  In the waste gate valve described in (3) above, even if the axial load that presses the valve plate against the valve seat due to the thermal expansion of the drive transmission shaft acts on the valve plate from the drive transmission unit, Since the second part at a position different from the first part in the rotation direction of the plate is urged to the valve seat side by the urging unit, the valve plate toward the valve seat side due to the thermal expansion of the drive transmission unit Tilt can be suppressed. Therefore, sticking of the valve seat and the valve plate and a decrease in turbine efficiency can be suppressed.

  (4) In some embodiments, in the waste gate valve according to any one of (1) to (3), the first portion and the second portion are rotation centers of the valve plate. Are provided at symmetrical positions.

  According to the waste gate valve described in (4) above, it is possible to enhance the effect of pressing the valve plate uniformly (relatively uniformly) against the valve seat during the operation of the turbocharger. Thereby, the adhering of the valve seat and the valve plate and the decrease in turbine efficiency can be effectively suppressed.

  (5) In some embodiments, in the waste gate valve according to any one of (1) to (4), a lubricant layer provided between the valve plate and the valve seat is further provided. Prepare.

  According to the waste gate valve described in (4) above, the amount of exhaust gas leaked from the gap can be reduced by filling the gap between the valve plate and the valve seat with the lubricant layer. Further, the adhesion between the valve plate and the valve seat can be suppressed by the lubricating action of the lubricant layer.

  (6) A waste gate valve according to at least one embodiment of the present invention is a waste gate valve for opening and closing a bypass passage that bypasses an exhaust turbine of a turbocharger, and includes a valve seat having at least one through hole; A valve plate disposed adjacent to the valve seat and having at least one through hole; a first actuator; and a driving force of the first actuator is transmitted to a first portion of the valve plate to move the valve plate. A drive transmission unit configured to rotate, and a second portion of the valve plate that is at a position different from the first portion in the rotation direction of the valve plate so as to allow the valve plate to rotate. And a supporting unit for supporting.

  In the waste gate valve described in (6) above, the axial load that presses the valve plate against the valve seat is generated from the drive transmission unit due to thermal expansion of the drive transmission unit or vibration of the engine during the operation of the turbocharger. Acts on the first part of the valve plate. Even in such a case, since the second part at a position different from the first part in the rotation direction of the valve plate is supported by the support unit, the inclination of the valve plate toward the valve seat can be suppressed. .

  Therefore, since it is possible to suppress the contact of the valve plate with the valve seat during operation of the turbocharger without providing a large clearance between the valve seat and the valve plate, it is possible to prevent the valve seat and the valve plate from sticking and reduce the turbine efficiency. Can be suppressed.

(7) In some embodiments, in the waste gate valve according to (6) above,
Each of the drive transmission unit and the support unit is provided on the opposite side of the valve seat across the valve plate.

  In the waste gate valve described in (7) above, during the operation of the turbocharger, due to the thermal expansion of the drive transmission unit, the axial load that presses the valve plate against the valve seat causes a load from the drive transmission unit to Acts on one site. Even in such a case, due to the thermal expansion of the support unit, an axial load that presses the valve plate against the valve seat acts on the second portion that is located at a position different from the first portion in the rotation direction of the valve plate. Therefore, compared with a configuration in which the valve plate is supported at one point as in Patent Document 1, the valve plate can be pressed against the valve seat uniformly (relatively uniformly) during the operation of the turbocharger. Thereby, the inclination to the valve seat side of the valve plate resulting from the thermal expansion of the drive transmission unit can be suppressed.

  Therefore, since it is possible to suppress the contact of the valve plate with the valve seat during operation of the turbocharger without providing a large clearance between the valve seat and the valve plate, it is possible to prevent the valve seat and the valve plate from sticking and reduce the turbine efficiency. Can be suppressed.

  (8) In some embodiments, in the waste gate valve according to (7), the drive transmission unit extends in a direction intersecting the valve plate on the opposite side of the valve seat with the valve plate interposed therebetween. An existing drive transmission shaft configured to transmit the driving force of the first actuator to the valve plate via the drive transmission shaft.

  In the waste gate valve described in (8) above, an axial load that presses the valve plate against the valve seat due to thermal expansion of the drive transmission shaft acts on the valve plate from the drive transmission unit. Even in such a case, due to the thermal expansion of the support unit, an axial load that presses the valve plate against the valve seat acts on the second portion that is located at a position different from the first portion in the rotation direction of the valve plate. Therefore, the inclination of the valve plate toward the valve seat due to the thermal expansion of the drive transmission shaft can be suppressed. Therefore, sticking of the valve seat and the valve plate and a decrease in turbine efficiency can be suppressed.

  (9) In some embodiments, in the waste gate valve according to (7) or (8), the support unit intersects the valve plate on the opposite side of the valve seat with the valve plate interposed therebetween. A rod member extending in the direction.

  According to the waste gate valve described in (9) above, during the operation of the turbocharger, the axial load that presses the valve plate against the valve seat due to the thermal expansion of the rod member causes the second load of the valve plate from the support unit. Acts on the site. Thereby, the inclination to the valve seat side of the valve plate resulting from the thermal expansion of the drive transmission unit can be suppressed. Therefore, sticking of the valve seat and the valve plate and a decrease in turbine efficiency can be suppressed.

  (10) In some embodiments, the turbine according to (9), further including a second actuator, wherein the support unit transmits the driving force of the second actuator via the rod member. The valve plate is configured to rotate together with the drive transmission unit.

  According to the waste gate valve described in (10) above, by synchronizing the output of the first actuator and the output of the second actuator, the valve plate can be smoothly rotated and more precise flow control is possible. It becomes.

  (11) In some embodiments, in the waste gate valve according to any one of the above (7) to (10), the drive transmission unit is located on a side opposite to the valve seat with the valve plate interposed therebetween. A drive transmission shaft extending in a direction intersecting the valve plate; a drive shaft extending in a direction intersecting the drive transmission shaft and driven by the first actuator; the drive shaft and the drive transmission shaft; A first link arm connecting the valve plate, the support unit extending in a direction intersecting the valve plate on the opposite side of the valve seat across the valve plate, the rod member, A second link arm connecting the drive shaft of the drive transmission unit, and the support unit DOO, the through rod member transmits a driving force of the first actuator to the second portion of the valve plate, configured to rotate the valve plate together with the drive transmission unit.

  According to the waste gate valve described in (11) above, since the number of actuators required for the operation of the waste gate valve can be reduced to one, the weight is reduced compared to the waste gate valve described in (10) above. And cost savings can be expected.

  (12) In some embodiments, in the waste gate valve according to any one of (6) to (11), the first portion and the second portion are rotation centers of the valve plate. Are provided at symmetrical positions.

  According to the waste gate valve described in the above (12), the drive transmission unit and the support unit support the first part and the second part provided at symmetrical positions with respect to the rotation center of the valve plate, respectively. Further, it is possible to effectively suppress the inclination of the valve plate toward the valve seat due to thermal expansion of the drive transmission unit, vibration of the engine, and the like. As a result, the contact of the valve plate with the valve seat can be suppressed, and the adhesion between the valve seat and the valve plate and the decrease in turbine efficiency can be suppressed.

  (13) In some embodiments, in the waste gate valve according to any one of (6) to (12), a lubricant layer provided between the valve plate and the valve seat is further provided. Prepare.

  According to the waste gate valve described in (13) above, the amount of exhaust gas leaking from the gap can be reduced by filling the gap between the valve plate and the valve seat with the lubricant layer. Further, the adhesion between the valve plate and the valve seat can be suppressed by the lubricating action of the lubricant layer.

  (14) In some embodiments, in the waste gate valve according to any one of the above (7) to (13), the support unit includes an elastic member, and the valve plate of the valve plate is included in the valve plate. The second part located at a position different from the first part in the rotation direction is configured to be urged toward the valve seat by the elastic force of the elastic member.

  In the waste gate valve described in (14) above, even if the axial load that presses the valve plate against the valve seat due to the thermal expansion of the drive transmission unit acts on the valve plate from the drive transmission unit, Since the second part at a position different from the first part in the rotation direction of the plate is urged toward the valve seat by the elastic force of the elastic member, the valve seat side of the valve plate caused by the thermal expansion of the drive transmission unit The inclination to can be suppressed. Therefore, sticking of the valve seat and the valve plate and a decrease in turbine efficiency can be suppressed.

  (15) A turbocharger according to at least one embodiment of the present invention includes an exhaust turbine configured to rotate by engine exhaust gas, a compressor driven by the exhaust turbine to compress intake air of the engine, and The wastegate valve according to any one of (1) to (14).

  According to the turbocharger described in (15) above, since the waste gate valve described in any one of (1) to (14) is provided, the valve seat and the valve plate are fixed to each other and the turbine efficiency is reduced. Can be suppressed. Thereby, it is possible to suppress the occurrence of a turbocharger failure and the performance degradation.

  According to at least one embodiment of the present invention, there is provided a wastegate valve capable of suppressing sticking between a valve plate and a valve seat and a decrease in turbine efficiency, and a turbocharger including the wastegate valve.

It is a block diagram showing typically the composition of turbocharger 100 concerning one embodiment. It is a schematic perspective view of the waste gate valve 8 (8A) which concerns on one Embodiment. FIG. 6 is a schematic axial view showing the waste gate valve 8 (8A) in a fully opened state. FIG. 6 is a schematic axial view showing the waste gate valve 8 (8A) in a half-open state. FIG. 6 is a schematic axial view showing the waste gate valve 8 (8A) in a fully closed state. It is a schematic perspective view of the waste gate valve 8 (8B) which concerns on one Embodiment. It is a schematic enlarged view which shows the structure of the X section in FIG. It is a figure which shows typically the structure of the waste gate valve 8 (8C) which concerns on one Embodiment. It is a figure which shows typically the structure of the waste gate valve 8 (8D) which concerns on one Embodiment. It is a figure which shows typically the structure of the waste gate valve 8 (8E) which concerns on one Embodiment. It is a figure which shows typically the structure of the waste gate valve 8 (8F) which concerns on one Embodiment. It is a figure which shows typically the structure of the waste gate valve 8 (8G) which concerns on one Embodiment. It is typical sectional drawing which shows the structural example of the waste gate valve 8 (8A-8G). It is a figure which shows the application | coating range of the lubricant layer 68 in a valve plate. It is a figure which shows the other structural example of the valve plate 12 typically.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

  FIG. 1 is a block diagram schematically illustrating a configuration of a turbocharger 100 according to an embodiment. As shown in FIG. 1, the turbocharger 100 includes an exhaust turbine 2 configured to rotate by an exhaust gas of an engine (not shown), a compressor 4 that is driven by the exhaust turbine 2 and compresses intake air of the engine, and an exhaust A waste gate valve 8 for opening and closing a bypass passage 6 that bypasses the turbine 2.

FIG. 2 is a schematic perspective view of the waste gate valve 8 (8A) according to the embodiment.
As shown in FIG. 2, the waste gate valve 8 (8A) includes a valve seat 10, a valve plate 12, a first actuator 14, a second actuator 16, a drive transmission unit 18, and a support unit 20.

  The valve seat 10 is an annular flat plate member, and the valve seat 10 is provided with a plurality of through holes 22 (exhaust gas ejection holes) at equal intervals along the rotation direction of the valve plate 12.

  The valve plate 12 is an annular flat plate member disposed adjacent to the valve seat 10. In the valve plate 12, a plurality of through holes 24 (exhaust gas ejection holes) are provided at intervals that coincide with the intervals of the through holes 22 along the rotation direction of the valve plate 12. A first pin 26 (first portion) and a second pin 28 (second portion) projecting to the opposite side of the valve seat 10 are provided on the surface of the valve plate 12 opposite to the valve seat 10. The first pin 26 and the second pin 28 are provided at symmetrical positions with respect to the rotation center of the valve plate 12.

  Each of the first actuator 14 and the second actuator 16 is configured by a motor, for example, and the output of the first actuator 14 and the output of the second actuator 16 are synchronized.

  The drive transmission unit 18 is provided on the opposite side of the valve seat 10 with the valve plate 12 in between, and transmits the driving force of the first actuator 14 to the first pin 26 of the valve plate 12 to rotate the valve plate 12. It is configured to let you. The drive transmission unit 18 includes a drive transmission shaft 30 (crankshaft) and an arm 32.

  The drive transmission shaft 30 extends in a direction orthogonal to the valve plate 12 (a direction intersecting the valve plate 12) on the opposite side of the valve seat 10 across the valve plate 12, and is driven by the first actuator 14. Is rotated (rotates). The arm 32 is fixed to the end of the drive transmission shaft 30 opposite to the first actuator 14 and has a slit-shaped groove 34 that supports the first pin 26 so as to be slidable. In this configuration, when the drive transmission shaft 30 is rotated about its axis by the first actuator 14, the arm 32 rotates integrally with the drive transmission shaft 30, and the valve is passed from the arm 32 through the first pin 26. The driving force is transmitted to the plate 12 and the valve plate 12 rotates.

  As described above, the drive transmission unit 18 is configured to transmit the driving force of the first actuator 14 to the valve plate 12 via the drive transmission shaft 30 and the arm 32 to rotate the valve plate 12.

  The support unit 20 is provided on the opposite side of the valve seat 10 with the valve plate 12 in between, and a second pin 28 at a position different from the first pin 26 in the rotation direction of the valve plate 12 in the valve plate 12 is provided. It supports so that rotation of the valve plate 12 is permitted. The support unit 20 includes a rod member 36 (crankshaft) and an arm 38.

  The rod member 36 extends in a direction orthogonal to the valve plate 12 (a direction intersecting the valve plate 12) on the opposite side of the valve seat 10 with the valve plate 12 interposed therebetween, and the axis line of the rod member 36 by the second actuator 16. It is turned around. The arm 38 is connected to the end of the rod member 36 opposite to the second actuator 16, and has a slit-like groove 40 that supports the second pin 28 so as to be slidable. In such a configuration, when the rod member 36 is rotated about its axis by the second actuator 16 synchronized with the first actuator 14, the arm 38 is rotated integrally with the rod member 36, and the second pin extends from the arm 38. The driving force is transmitted to the valve plate 12 via 28 and the valve plate 12 rotates.

  As described above, the support unit 20 transmits the driving force of the second actuator 16 to the second pin 28 of the valve plate 12 via the rod member 36 and the arm 38, and rotates the valve plate 12 together with the drive transmission unit 18. Configured as follows.

  FIG. 3 is a schematic axial view of the waste gate valve 8 (8A) in the fully opened state. FIG. 4 is a schematic axial view showing the waste gate valve 8 (8A) in a half-open state. FIG. 5 is a schematic axial view of the waste gate valve 8 (8A) in the fully closed state. 3-5, illustration of the 1st actuator 14 and the 2nd actuator 16 is abbreviate | omitted for convenience.

  The state shown in FIG. 3 is a state where the through hole 24 of the valve plate 12 and the through hole 22 of the valve seat 10 are completely overlapped, and the state shown in FIG. 4 is the state where the through hole 24 of the valve plate 12 and the valve seat 10 are overlapped. The through hole 22 of the valve plate 12 overlaps about half, and the state shown in FIG. 5 is a state where the through hole 24 of the valve plate 12 and the through hole 22 of the valve seat 10 do not overlap. As shown in FIGS. 3 to 5, the waste gate valve 8 changes the area where the through hole 24 of the valve plate 12 and the through hole 22 of the valve seat 10 overlap with the rotation of the valve plate 12. The valve opening is configured to be adjusted.

  According to the waste gate valve 8 (8A), the axial load that presses the valve plate 12 against the valve seat 10 is driven due to thermal expansion of the drive transmission unit 18 or vibration of the engine during the operation of the turbocharger 100. It acts on the valve plate 12 from the transmission unit 18. Even in such a case, since the second pin 28 at a position different from the first pin 26 in the rotation direction of the valve plate 12 is supported by the support unit 20, the inclination of the valve plate 12 can be suppressed. .

  Therefore, since it is possible to suppress contact of the valve plate 12 with respect to the valve seat 10 during operation of the turbocharger 100 without providing a large clearance between the valve seat 10 and the valve plate 12, Adherence and a decrease in turbine efficiency can be suppressed.

  Moreover, in the said form, since the drive transmission unit 18 and the support unit 20 are supporting the 1st pin 26 and the 2nd pin 28 which were provided in the symmetrical position with respect to the rotation center of the valve plate 12, respectively, drive transmission The inclination of the valve plate 12 toward the valve seat 10 due to the thermal elongation of the unit 18 or the vibration of the engine can be effectively suppressed. Thereby, the per contact of the valve plate 12 with respect to the valve seat 10 can be suppressed, and adhesion between the valve seat 10 and the valve plate 12 and a decrease in turbine efficiency can be suppressed.

  In the above embodiment, each of the drive transmission unit 18 and the support unit 20 is provided on the opposite side of the valve seat 10 with the valve plate 12 interposed therebetween.

  In such a configuration, during operation of the turbocharger 100, due to the thermal expansion of the drive transmission unit 18, an axial load that presses the valve plate 12 against the valve seat 10 acts on the valve plate 12 from the drive transmission unit 18. Even in such a case, due to the thermal expansion of the support unit 20, the axial load that presses the valve plate 12 against the valve seat 10 at a position different from the first pin 26 in the rotational direction of the valve plate 12 is the support unit. Therefore, when the turbocharger 100 is in operation, the valve plate 12 is made uniform (relatively uniform) when the turbocharger 100 is operated. ) Can be pressed. Thereby, the inclination of the valve plate 12 resulting from the thermal expansion of the drive transmission unit 18 can be suppressed. Therefore, the adhesion between the valve seat 10 and the valve plate 12 and a decrease in turbine efficiency can be suppressed.

  Moreover, in the said form, by synchronizing the output of the 1st actuator 14 and the output of the 2nd actuator 16, the smooth rotation of the valve plate 12 is attained, and more precise | minute flow control is attained.

  Next, another embodiment will be described. Note that, in the following embodiments, portions that are substantially common to the above-described embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 6 is a schematic perspective view of the waste gate valve 8 (8B) according to the embodiment. FIG. 7 is a schematic enlarged view showing the configuration of the portion X in FIG.
In one embodiment, as shown in FIGS. 6 and 7, the drive transmission unit 18 includes a drive shaft 42, a first link arm 44, a drive transmission shaft 30, and an arm 32. The drive shaft 42 extends in a direction perpendicular to the drive transmission shaft 30 (a direction intersecting the drive transmission shaft 30), and is driven in the axial direction by the first actuator 14. In this case, the first actuator 14 is a direct acting actuator such as a cylinder type. The first link arm 44 extends in a direction orthogonal to the drive transmission shaft 30 (a direction crossing the drive transmission shaft 30), and connects one end side of the drive shaft 42 and the drive transmission shaft 30.

  In the form shown in FIGS. 6 and 7, the support unit 20 includes a second link arm 46, a rod member 36, and an arm 38. The second link arm 46 extends in a direction orthogonal to the rod member 36 (a direction intersecting the rod member 36), and connects the other end side of the drive shaft 42 and the rod member 36.

  In this configuration, as shown in FIGS. 6 and 7, when the drive shaft 42 reciprocates in the axial direction by the first actuator 14, the first link arm 44 and the second link arm 46 connected to the drive shaft 42 are moved. The drive transmission shaft 30 and the rod member 36 are oscillated around the oscillation center. As the first link arm 44 swings, the drive transmission shaft 30 connected to the first link arm 44 rotates around its axis to drive the arm 32, and as the second link arm 46 swings, The rod member 36 connected to the second link arm 46 rotates about its axis to drive the arm 38. Thereby, the valve plate 12 supported by the arm 32 and the arm 38 rotates left and right, and the opening degree of the waste gate valve 8 (8B) is adjusted.

  6 and 7, the drive transmission unit 18 controls the drive force of the first actuator 14 via the drive shaft 42, the first link arm 44, the drive transmission shaft 30, and the arm 32. The valve plate 12 is configured to rotate by being transmitted to the first pin 26 of the plate 12. The support unit 20 transmits the driving force of the first actuator 14 to the second pin 28 of the valve plate 12 via the drive shaft 42, the second link arm 46, the rod member 36, and the arm 38, and the drive transmission unit 18. At the same time, the valve plate 12 is configured to rotate.

  In such a configuration, the number of actuators required for the operation of the waste gate valve 8 (8B) can be reduced to one, so that an effect of weight reduction and cost reduction can be expected as compared with the waste gate valve 8 (8A).

  FIG. 8 is a diagram schematically illustrating the configuration of the waste gate valve 8 (8C) according to the embodiment. FIG. 9 is a diagram schematically illustrating the configuration of the waste gate valve 8 (8D) according to the embodiment. FIG. 10 is a diagram schematically illustrating the configuration of the waste gate valve 8 (8E) according to the embodiment. FIG. 11 is a diagram schematically illustrating the configuration of the waste gate valve 8 (8F) according to the embodiment. FIG. 12 is a diagram schematically showing the configuration of the waste gate valve 8 (8G) according to one embodiment.

  In some embodiments, as shown in FIGS. 8 to 12, the waste gate valve 8 (8 </ b> C to 8 </ b> G) includes a first pin 26 (first portion) in the rotation direction of the valve plate 12 of the valve plate 12. A biasing unit 50 configured to bias the biased part 48 (second part) at a position different from the valve seat 10 side. 8 to 12, unlike the waste gate valve 8 (8 </ b> A, 8 </ b> B), the driving force for rotating the valve plate 12 is input only from the first pin 26 via the drive transmission unit 18. The 9 to 12, the urging unit 50 rotates the second pin 28 of the valve plate 12 at a position different from the first pin 26 in the rotation direction of the valve plate 12. It also functions as a support unit 20 that supports the movement.

  In the waste gate valve 8 (8C to 8G), during the operation of the turbocharger 100, the axial load that presses the valve plate 12 against the valve seat 10 due to the thermal expansion of the drive transmission unit 18 is caused from the drive transmission unit 18 to the valve. Acts on the plate 12. Even in such a case, the urged portion 48 at a position different from the first pin 26 in the rotational direction of the valve plate 12 is urged toward the valve seat 10 by the urging unit 50. Compared to the configuration in which the valve plate 12 is supported at one point as described above, the valve plate 12 can be pressed against the valve seat 10 uniformly (relatively uniformly) during the operation of the turbocharger 100. Thereby, the inclination to the valve seat 10 side of the valve plate 12 resulting from the thermal expansion of the drive transmission unit 18 can be suppressed.

  Therefore, since it is possible to suppress contact of the valve plate 12 with respect to the valve seat 10 during operation of the turbocharger 100 without providing a large clearance between the valve seat 10 and the valve plate 12, Adherence and a decrease in turbine efficiency can be suppressed.

  In some embodiments, as shown in FIGS. 8 to 12, the urging unit 50 includes an elastic member 52, and the urged portion 48 of the valve plate 12 is moved toward the valve seat 10 by the elastic force of the elastic member 52. Configured to be energized. The elastic member 52 may be, for example, a leaf spring (see FIG. 8), a coil spring (see FIGS. 9 to 12), a disc spring, rubber, or the like.

  According to such a configuration, even when the axial load that presses the valve plate 12 against the valve seat 10 due to the thermal expansion of the drive transmission unit 18 acts on the valve plate 12 from the drive transmission unit 18, the valve plate The biased portion 48 at a position different from the first pin 26 in the 12 rotation direction is biased to the valve seat 10 side by the elastic force of the elastic member 52, and thus is caused by the thermal expansion of the drive transmission unit 18. The inclination of the valve plate 12 toward the valve seat 10 can be suppressed.

  In one embodiment, as shown in FIG. 8, one end of a leaf spring as the elastic member 52 is fixed to the first housing 54 (for example, a turbine housing or a bearing housing) of the turbocharger 100, and the other end of the leaf spring. Is configured to slidably abut on a biased portion 48 of the valve plate 12 (a part of the surface of the valve plate 12 opposite to the valve seat 10). According to this configuration, the contact of the valve plate 12 with respect to the valve seat 10 can be suppressed with a simple configuration.

  In some embodiments, as shown in FIGS. 9-11, the biasing unit 50 includes a rod member 56, an elastic member 52, a rod member 58, and an arm 38 arranged in a straight line. One end of the rod member 56 is supported by the housing of the turbocharger 100, and the other end of the rod member 56 is fixed to one end of the elastic member 52. The other end of the elastic member 52 is fixed to one end of the rod member 58, and the other end of the rod member 58 is fixed to the arm 38. 9 and 10, one end of the rod member 58 is fixed to a second housing 60 (for example, a compressor housing) of the turbocharger 100. In the form shown in FIG. 12, the first housing of the turbocharger 100 is used. 54 (for example, a turbine housing or a bearing housing).

  9 to 11, the elastic force of the elastic member 52 is brought into contact with the biased portion 48 of the valve plate 12 (the arm 38 of the valve plate 12 through the rod member 58 and the arm 38). The portion to be urged 48 of the valve plate 12 is urged toward the valve seat 10 side. According to such a configuration, the valve plate 12 can be smoothly rotated as compared with the embodiment shown in FIG. 8, and more precise flow rate control is possible.

  In one embodiment, an arm 64 may be provided on the starting point side (rod member 56 side) of the urging unit 50 as shown in FIG. In the form shown in FIG. 12, the urging unit 50 includes a pin 62, an arm 64, a rod member 56, an elastic member 52, and a rod member 58. The pin extends in parallel to the rod member 56 while being inserted into the arm 64, and one end thereof is supported by the first housing 54. The arm 64 is configured to be rotatable around the pin 62 while supporting the rod member 56. The end of the rod member 56 opposite to the arm 64 is fixed to one end of the elastic member 52, and the other end of the elastic member 52 is fixed to one end of the rod member 58. The other end of the rod member 58 is fixed to the valve plate 12. In this configuration, the elastic force of the elastic member 52 is transmitted to the biased portion 48 of the valve plate 12 (the portion of the valve plate 12 where the other end of the rod member 58 is fixed) via the rod member 58. Thus, the biased portion 48 of the valve plate 12 is biased toward the valve seat 10 side. According to such a configuration, the valve plate 12 can be smoothly rotated as compared with the embodiment shown in FIG. 8, and more precise flow rate control is possible.

  In one embodiment, as shown in FIG. 10, the drive transmission unit 18 may include an elastic member 66 that applies an elastic force to the valve plate 12 in a direction of urging the valve plate 12 toward the valve seat 10. .

  In some embodiments, the above-described wastegate valve may further include a lubricant layer 68 applied between the valve plate 12 and the valve seat 10 as shown in FIGS. 13 and 14. As the lubricant layer 68, for example, an abradable seal or a solid lubricant can be suitably used.

  According to this configuration, the gap between the valve plate 12 and the valve seat 10 is filled with the lubricant layer 68, so that the amount of exhaust gas leakage from the gap can be reduced. Further, the adhesion between the valve plate 12 and the valve seat 10 can be suppressed by the lubricating action of the lubricant layer 68.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

  For example, in some embodiments described above, the valve plate 12 is supported at two locations, but the valve plate may be supported at a plurality of three or more locations. Even in this case, the valve plates are preferably supported at equal intervals. Moreover, in some embodiment mentioned above, although the form which drives a valve plate in two places was illustrated, the valve plate may be driven in two or more places.

  In the above-described embodiments, the valve plate 12 has the first pin 26 and the second pin 28. However, as shown in FIG. 15, the valve plate 12 and the arm 39 are integrally formed. It may be molded. In the form shown in FIG. 15, the two arms 39 are provided at symmetrical positions with respect to the rotation center of the valve plate 12. In this case, the above-described drive transmission unit 18 is engaged with one arm 39, and the support unit 20 or the urging unit 50 is configured to engage with the other arm 39.

2 Exhaust turbine 4 Compressor 6 Bypass passage 8 Waste gate valve 10 Valve seat 12 Valve plate 14 First actuator 16 Second actuator 18 Drive transmission unit 20 Support units 22, 24 Through hole 26 First pin 28 Second pin 30 Drive transmission Shaft 32, 38, 64, 69 Arm 34, 40 Groove 36, 56, 58 Rod member 42 Drive shaft 44 First link arm 46 Second link arm 48 Energized part 50 Energizing unit 52, 66 Elastic member 54 First Housing 60 Second housing 62 Pin 68 Lubricant layer 100 Turbocharger

Claims (15)

A waste gate valve for opening and closing a bypass passage that bypasses an exhaust turbine of a turbocharger,
A valve seat having at least one through hole;
A valve plate disposed adjacent to the valve seat and having at least one through hole;
A first actuator;
A drive transmission unit provided on the opposite side of the valve seat with the valve plate interposed therebetween, and configured to transmit the driving force of the first actuator to the first part of the valve plate to rotate the valve plate. When,
An urging unit configured to urge a second part of the valve plate at a position different from the first part in the rotation direction of the valve plate toward the valve seat;
Wastegate valve with   The urging unit includes an elastic member, and a second portion of the valve plate that is different from the first portion in the rotation direction of the valve plate is attached to the valve seat side by the elastic force of the elastic member. The wastegate valve of claim 1, wherein the wastegate valve is configured to force.   The drive transmission unit includes a drive transmission shaft that extends in a direction intersecting the valve plate on the opposite side of the valve seat with the valve plate in between, and the driving force of the first actuator via the drive transmission shaft The wastegate valve according to claim 1, wherein the wastegate valve is configured to transmit the pressure to the valve plate.   The waste gate valve according to any one of claims 1 to 3, wherein the first part and the second part are provided at symmetrical positions with respect to a rotation center of the valve plate.   The wastegate valve according to any one of claims 1 to 4, further comprising a lubricant layer provided between the valve plate and the valve seat. A waste gate valve for opening and closing a bypass passage that bypasses an exhaust turbine of a turbocharger,
A valve seat having at least one through hole;
A valve plate disposed adjacent to the valve seat and having at least one through hole;
A first actuator;
A drive transmission unit configured to transmit the driving force of the first actuator to the first portion of the valve plate to rotate the valve plate;
A support unit for supporting a second part of the valve plate at a position different from the first part in the rotation direction of the valve plate so as to allow the valve plate to rotate;
Wastegate valve with   The waste gate valve according to claim 6, wherein each of the drive transmission unit and the support unit is provided on the opposite side of the valve seat with the valve plate interposed therebetween.   The drive transmission unit includes a drive transmission shaft that extends in a direction intersecting the valve plate on the opposite side of the valve seat with the valve plate in between, and the driving force of the first actuator via the drive transmission shaft The wastegate valve of claim 7, wherein the wastegate valve is configured to transmit to the valve plate.   The wastegate valve according to claim 7 or 8, wherein the support unit includes a rod member that extends in a direction intersecting the valve plate on a side opposite to the valve seat across the valve plate. A second actuator;
The said support unit is comprised so that the driving force of the said 2nd actuator may be transmitted to the 2nd site | part of the said valve plate via the said rod member, and the said valve plate may be rotated with the said drive transmission unit. The wastegate valve according to 9. The drive transmission unit is
A drive transmission shaft extending in a direction intersecting the valve plate on the opposite side of the valve seat across the valve plate;
A drive shaft extending in a direction intersecting the drive transmission shaft and driven by the first actuator;
A first link arm connecting the drive shaft and the drive transmission shaft;
Including
The support unit is
A rod member extending in a direction crossing the valve plate on the opposite side of the valve seat across the valve plate;
A second link arm connecting the rod member and the drive shaft of the drive transmission unit;
Including
The said support unit is comprised so that the driving force of the said 1st actuator may be transmitted to the 2nd site | part of the said valve plate via the said rod member, and the said valve plate may be rotated with the said drive transmission unit. The wastegate valve according to any one of 7 to 10.   The wastegate valve according to any one of claims 6 to 11, wherein the first part and the second part are provided at symmetrical positions with respect to a rotation center of the valve plate.   The wastegate valve according to any one of claims 6 to 12, further comprising a lubricant layer applied between the valve plate and the valve seat.   The support unit includes an elastic member, and biases a second portion of the valve plate that is at a position different from the first portion in the rotation direction of the valve plate toward the valve seat by the elastic force of the elastic member. The wastegate valve according to any one of claims 7 to 13, wherein the wastegate valve is configured to.   An exhaust turbine configured to rotate by engine exhaust gas, a compressor driven by the exhaust turbine to compress intake air of the engine, and the waste gate valve according to any one of claims 1 to 14 Turbocharger with

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