Supercharger

Abstract

To achieve smooth operation with a link mechanism.SOLUTION: A supercharger 1-1 includes an actuator 4-1, a turbine housing 21 accommodating a turbine wheel 22, a movable member provided on the turbine housing 21, and a link mechanism 5-1. The link mechanism includes a plurality of links, a pin 53a that connects two of the plurality of links 52, 53 rotatably to each other, and a pin hole 52b into which the pin 53a is fitted, and connects the actuator 4-1 and the movable member, in which the positional relationship between the pin 53a and the pin hole 52b changes between a first positional relationship in which the central axes of the pin 53a and the pin hole 52b are not parallel to each other, and a second positional relationship in which the central axes of the pin 53a and the pin hole 52b become a state close to parallel as compared with the first positional relationship.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a turbocharger. [Background technology]

[0002] In a turbocharger, a movable member may be provided in a turbine housing that accommodates a turbine impeller. In this case, the operation of the movable member is controlled, for example, by using an actuator connected to the movable member via a link mechanism. For example, as disclosed in Patent Document 1, the operation of a wastegate valve provided as a movable member in the turbine housing is controlled by using an actuator connected to the wastegate valve via a link mechanism. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-008928 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the link mechanism, a pin provided on one of two links among a plurality of links is rotatably fitted into a pin hole provided on the other of the two links. This allows the two links to be rotatably connected to each other. If the central axis of the pin and the central axis of the pin hole are inclined relative to each other, this can hinder smooth operation of the link mechanism.

[0005] An object of the present disclosure is to provide a turbocharger capable of achieving smooth operation by a link mechanism. [Means for solving the problem]

[0006] In order to solve the above problems, the turbocharger disclosed herein includes an actuator, a turbine housing that accommodates a turbine impeller, a movable member provided in the turbine housing, a plurality of links, a pin that rotatably connects two of the plurality of links to each other, and a pin hole into which the pin fits, and the positional relationship between the pin and the pin hole transitions between a first positional relationship in which the central axis of the pin and the central axis of the pin hole are not parallel to each other and a second positional relationship in which the central axis of the pin and the central axis of the pin hole are closer to parallel than the first positional relationship, and includes a link mechanism that connects the actuator and the movable member.

[0007] The positional relationship between the pin and the pin hole may be a first positional relationship when the turbocharger is stopped, and a second positional relationship when the turbocharger is operating.

[0008] When the positional relationship between the pin and the pin hole transitions between the first positional relationship and the second positional relationship, the central axis of the pin and the central axis of the pin hole may rotate relatively on a plane intersecting the central axis of the turbine wheel.

[0009] The movable member may be a wastegate valve.

[0010] The multiple links may include a first link that is rotated by an actuator, a second link that is rotatably connected to the first link, and a third link that is rotatably connected to the second link and rotates integrally with the movable member.

[0011] The multiple links may include a first link that is axially expanded and contracted by an actuator, and a second link that is rotatably connected to the first link and rotates integrally with the movable member. Effect of the Invention

[0012] According to the present disclosure, smooth operation of the link mechanism can be achieved. [Brief description of the drawings]

[0013] [Figure 1]FIG. 1 is an external view of a turbocharger according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is an external view of the turbocharger according to the first embodiment of the present disclosure. [Diagram 3] FIG. 3 is a diagram showing a positional relationship between the second link and the third link when the turbocharger according to the first embodiment of the present disclosure is stopped. [Figure 4] FIG. 4 is a diagram showing a positional relationship between the second link and the third link during operation of the turbocharger according to the first embodiment of the present disclosure. [Diagram 5] FIG. 5 is an external view of a turbocharger according to the second embodiment of the present disclosure. [Figure 6] FIG. 6 is an external view of a turbocharger according to the second embodiment of the present disclosure. [Figure 7] FIG. 7 is a diagram showing the positional relationship between the first link and the second link when the turbocharger according to the second embodiment of the present disclosure is stopped. [Figure 8] FIG. 8 is a diagram showing the positional relationship between the first link and the second link during operation of the turbocharger according to the second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples for ease of understanding, and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present disclosure are not illustrated.

[0015] 1 and 2 are external views of a turbocharger 1-1 according to a first embodiment of the present disclosure. Fig. 1 is a view of the turbocharger 1-1 as viewed in a direction perpendicular to a central axis 22a of a turbine wheel 22, which will be described later. Fig. 1 is a view of the turbocharger 1-1 as viewed from the turbine 2 side in the direction of the central axis 22a of a turbine wheel 22, which will be described later. Specifically, Fig. 2 is a view of the turbocharger 1-1 as viewed in the direction of an arrow D1 in Fig. 1.

[0016] 1 and 2, the turbocharger 1-1 includes a turbine 2, a centrifugal compressor 3, an actuator 4-1, a link mechanism 5-1, and a wastegate valve 6. The wastegate valve 6 corresponds to an example of a movable member. The movable member refers to a member whose position and / or attitude can be changed by at least one of a rotational motion and a translational motion.

[0017] The turbine 2 includes a turbine housing 21. A turbine wheel 22 is rotatably housed in the turbine housing 21. The centrifugal compressor 3 includes a compressor housing 31. A compressor wheel (not shown) is rotatably housed in the compressor housing 31. The turbine wheel 22 and the compressor wheel are connected by a shaft that is rotatably supported by bearings. The turbine wheel 22, the compressor wheel, and the shaft rotate integrally.

[0018] The turbocharger 1-1 is connected to an engine (not shown). Exhaust gas discharged from the engine flows into a turbine housing 21 and rotates a turbine wheel 22. The exhaust gas then flows out of the turbine housing 21. The rotational force of the turbine wheel 22 is transmitted to a compressor wheel via a shaft. By the rotation of the compressor wheel, outside air is sucked into a compressor housing 31, compressed, and supplied to an intake port of the engine.

[0019] The actuator 4-1 and the link mechanism 5-1 are provided to operate the wastegate valve 6. The wastegate valve 6 is connected to the actuator 4-1 via the link mechanism 5-1. The actuator 4-1 is an electric motor capable of outputting rotational power. The actuator 4-1 is provided in the compressor housing 31. However, the actuator 4-1 may be directly attached to the compressor housing 31, or may be attached to the compressor housing 31 via another member. The power output from the actuator 4-1 is transmitted to the wastegate valve 6 via the link mechanism 5-1. The operation of the wastegate valve 6 is controlled using the actuator 4-1.

[0020] The wastegate valve 6 is provided in the turbine housing 21. Specifically, the wastegate valve 6 is provided in a bypass flow passage that connects the upstream side and downstream side of the turbine wheel 22 in the turbine housing 21 by bypassing the turbine wheel 22. The wastegate valve 6 can open and close the bypass flow passage by rotating. When the bypass flow passage is closed by the wastegate valve 6, all of the exhaust gas that flows from the engine into the turbine housing 21 passes through the turbine wheel 22. On the other hand, when the bypass flow passage is opened by the wastegate valve 6, a part of the exhaust gas that flows from the engine into the turbine housing 21 passes through the bypass flow passage and bypasses the turbine wheel 22. The operation of the wastegate valve 6 adjusts the supercharging pressure by the supercharger 1-1.

[0021] The link mechanism 5-1 includes three links: a first link 51, a second link 52, and a third link 53. Each of the first link 51, the second link 52, and the third link 53 has a thin plate shape extending in one direction. The first link 51, the second link 52, and the third link 53 are connected in this order. Power output from the actuator 4-1 is transmitted to the first link 51, the second link 52, and the third link 53 in this order, and then transmitted to the wastegate valve 6.

[0022] The first link 51 is connected to the actuator 4-1 and is rotated by the actuator 4-1. Specifically, a shaft hole 51a is provided on one end side of the first link 51. The shaft hole 51a penetrates the first link 51 in the thickness direction of the first link 51. The output shaft 41 of the actuator 4-1 is fitted into the shaft hole 51a. The output shaft 41 of the actuator 4-1 rotates integrally with the first link 51. A pin 51b is provided on the other end side of the first link 51. The pin 51b protrudes from the first link 51 in the thickness direction of the first link 51.

[0023] The second link 52 is rotatably connected to the first link 51. Specifically, a pin hole 52a is provided on one end side of the second link 52. The pin hole 52a penetrates the second link 52 in the thickness direction of the second link 52. A pin 51b of the first link 51 is rotatably fitted into the pin hole 52a. As a result, the first link 51 and the second link 52 are rotatably connected to each other. A pin hole 52b is provided on the other end side of the second link 52. The pin hole 52b penetrates the second link 52 in the thickness direction of the second link 52.

[0024] The third link 53 is rotatably connected to the second link 52. Specifically, a pin 53a is provided on one end side of the third link 53. The pin 53a protrudes from the third link 53 in the thickness direction of the third link 53. The pin 53a is rotatably fitted into a pin hole 52b of the second link 52. As a result, the second link 52 and the third link 53 are rotatably connected to each other.

[0025] The third link 53 rotates integrally with the wastegate valve 6. Specifically, a shaft 53b is provided on the other end side of the third link 53. The shaft 53b protrudes from the third link 53 in the thickness direction of the third link 53. The shaft 53b is connected to the wastegate valve 6. The shaft 53b rotates integrally with the wastegate valve 6.

[0026] As described above, in the link mechanism 5-1, a pin provided on one of two adjacent links is rotatably fitted into a pin hole provided on the other of the two links. Thus, the two adjacent links are rotatably connected to each other by the pin and the pin hole. If the central axis of the pin and the central axis of the pin hole are inclined relative to each other, this will hinder smooth operation of the link mechanism 5-1.

[0027] In the turbocharger 1-1, the compressor housing 31 is attached to the engine. The turbine housing 21 is also attached to the engine. Specifically, a flange 23 of the turbine housing 21 is attached to the engine. The flange 23 extends in the radial direction of the turbine wheel 22 and faces the circumferential direction of the turbine wheel 22. Exhaust gas discharged from the engine flows into the turbine housing 21 through an opening formed in the flange 23.

[0028] When the turbocharger 1-1 is stopped, the compressor housing 31 and the turbine housing 21 are both at room temperature, for example. On the other hand, when the turbocharger 1-1 is operating, the temperature of the turbine housing 21 is higher than the temperature of the compressor housing 31. Therefore, when the turbocharger 1-1 is operating, the deformation of the turbine housing 21 due to thermal expansion is larger than the deformation of the compressor housing 31 due to thermal expansion. When the turbocharger 1-1 is operating, the turbine housing 21 is deformed from the flange 23 due to thermal expansion. As a result, when the turbocharger 1-1 is operating, the turbine housing 21 is deformed due to thermal expansion so as to rotate in the circumferential direction of the turbine wheel 22 relative to the compressor housing 31.

[0029] In the link mechanism 5-1, the positional relationship between the pin 53a of the third link 53 and the pin hole 52b of the second link 52 has been devised to take into account the deformation due to thermal expansion described above so as to realize smooth operation of the link mechanism 5-1.

[0030] Fig. 3 is a diagram showing the positional relationship between the second link 52 and the third link 53 when the turbocharger 1-1 is stopped. Fig. 4 is a diagram showing the positional relationship between the second link 52 and the third link 53 when the turbocharger 1-1 is operating. Figs. 3 and 4 are views of the second link 52 and the third link 53 as viewed in the direction of arrow D1 in Fig. 1. Figs. 3 and 4 show only a part of the second link 52 and the third link 53 of the turbocharger 1-1, and illustration of other parts is omitted.

[0031] As shown in Fig. 3, when the turbocharger 1-1 is stopped, the central axis 53a1 of the pin 53a of the third link 53 and the central axis 52b1 of the pin hole 52b of the second link 52 are inclined relative to each other. Specifically, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are inclined relative to each other on a plane intersecting the central axis 22a of the turbine wheel 22 (for example, a plane perpendicular to the central axis 22a, or a plane slightly inclined relative to such a plane). The positional relationship in Fig. 3 corresponds to a first positional relationship in which the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are not parallel to each other.

[0032] As described above, when the turbocharger 1-1 is in operation, the turbine housing 21 is deformed by thermal expansion relative to the compressor housing 31 so as to rotate in the circumferential direction of the turbine wheel 22. As a result, the third link 53 rotates integrally with the turbine housing 21 in accordance with the thermal expansion of the turbine housing 21. On the other hand, the second link 52, which is not directly connected to the turbine housing 21, does not basically rotate in accordance with the thermal expansion of the turbine housing 21. Therefore, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22 (for example, a plane perpendicular to the central axis 22a, or a plane slightly inclined with respect to such a plane). In other words, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b rotate relatively around a rotation axis along the direction of the central axis 22a of the turbine wheel 22.

[0033] As shown in FIG. 4, when the turbocharger 1-1 is in operation, the central axis 53a1 of the pin 53a of the third link 53 and the central axis 52b1 of the pin hole 52b of the second link 52 are parallel to each other. For example, when the turbocharger 1-1 is in operation, the central axis 53a1 of the pin 53a of the third link 53 and the central axis 52b1 of the pin hole 52b of the second link 52 are coaxial. The positional relationship in FIG. 4 corresponds to a second positional relationship in which the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are closer to being parallel than the first positional relationship. When the turbocharger 1-1 is stopped, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22, and the positional relationship between the pin 53a and the pin hole 52b returns to the first positional relationship in FIG. 3.

[0034] In the above, an example has been described in which central axis 53a1 of pin 53a and central axis 52b1 of pin hole 52b are parallel to each other in the second positional relationship of Fig. 4. However, in the second positional relationship, central axis 53a1 of pin 53a and central axis 52b1 of pin hole 52b only need to be closer to parallel than in the first positional relationship, and do not have to be strictly parallel to each other.

[0035] As described above, in the turbocharger 1-1, the positional relationship between the pin 53a and the pin hole 52b in the link mechanism 5-1 transitions between a first positional relationship in which the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are not parallel to each other, and a second positional relationship in which the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are closer to parallel than the first positional relationship. By transitioning the positional relationship between the pin 53a and the pin hole 52b to the second positional relationship, it is possible to suppress the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b from being inclined relative to each other. Therefore, it is possible to realize a smooth operation by the link mechanism 5-1.

[0036] In particular, in the turbocharger 1-1, the positional relationship between the pin 53a and the pin hole 52b is a first positional relationship when the turbocharger 1-1 is stopped, and a second positional relationship when the turbocharger 1-1 is operating. This appropriately suppresses the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b from inclining relative to each other when the turbocharger 1-1 is operating, thereby enabling smooth operation by the link mechanism 5-1.

[0037] In particular, in the turbocharger 1-1, when the positional relationship between the pin 53a and the pin hole 52b transitions between the first positional relationship and the second positional relationship, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22. As a result, taking into consideration the direction of deformation due to thermal expansion of the turbine housing 21, it is appropriately realized that in the second positional relationship, the central axis 53a1 of the pin 53a and the central axis 52b1 of the pin hole 52b are closer to being parallel to each other than in the first positional relationship.

[0038] In particular, in the turbocharger 1-1, the multiple links of the link mechanism 5-1 include a first link 51 rotated by the actuator 4-1, a second link 52 rotatably connected to the first link 51, and a third link 53 rotatably connected to the second link 52 and rotates integrally with the movable member (the wastegate valve 6 in the above example). Therefore, a smooth operation can be realized by the link mechanism 5-1 including the first link 51, the second link 52, and the third link 53 as described above.

[0039] Fig. 5 and Fig. 6 are external views of a turbocharger 1-2 according to a second embodiment of the present disclosure. Fig. 5 is a view of the turbocharger 1-2 viewed in a direction perpendicular to the central axis 22a of the turbine wheel 22. Fig. 6 is a view of the turbocharger 1-2 viewed from the turbine 2 side in the direction of the central axis 22a of the turbine wheel 22. Specifically, Fig. 6 is a view of the turbocharger 1-2 viewed in the direction of the arrow D2 in Fig. 5.

[0040] 5 and 6, the turbocharger 1-2 includes a turbine 2, an actuator 4-2, a link mechanism 5-2, and a wastegate valve 6. Although not shown in Fig. 5 and 6, the turbocharger 1-2 also includes a centrifugal compressor 3 including a compressor housing 31, similar to the above-mentioned turbocharger 1-1.

[0041] The turbocharger 1-2 differs from the above-mentioned turbocharger 1-1 in that the actuator 4-1 and the link mechanism 5-1 are replaced with an actuator 4-2 and a link mechanism 5-2. In other respects, the turbocharger 1-2 is common to the above-mentioned turbocharger 1-1.

[0042] The actuator 4-2 and the link mechanism 5-2 are provided to operate the wastegate valve 6, similarly to the actuator 4-1 and the link mechanism 5-1 described above. The wastegate valve 6 is connected to the actuator 4-2 via the link mechanism 5-2. The actuator 4-2 is an electric cylinder capable of translating an output shaft. The actuator 4-2 is provided in the compressor housing 31. However, the actuator 4-2 may be directly attached to the compressor housing 31, or may be attached to the compressor housing 31 via another member. The power output from the actuator 4-2 is transmitted to the wastegate valve 6 via the link mechanism 5-2. The operation of the wastegate valve 6 is controlled using the actuator 4-2.

[0043] The link mechanism 5-2 includes two links, a first link 54 and a second link 55. Each of the first link 54 and the second link 55 has a thin plate shape extending in one direction. The first link 54 and the second link 55 are connected in this order. The power output from the actuator 4-2 is transmitted to the first link 54 and the second link 55 in this order, and then transmitted to the wastegate valve 6.

[0044] The first link 54 corresponds to the output shaft of the actuator 4-2. The first link 54 is expanded and contracted in the axial direction by the actuator 4-2. A pin 54a is provided on the tip side of the first link 54. The pin 54a protrudes from the first link 54 in the thickness direction of the first link 54.

[0045] The second link 55 is rotatably connected to the first link 54. Specifically, a pin hole 55a is provided on one end side of the second link 55. The pin hole 55a penetrates the second link 55 in the thickness direction of the second link 55. A pin 54a of the first link 54 is rotatably fitted into the pin hole 55a. Thus, the first link 54 and the second link 55 are rotatably connected to each other.

[0046] The second link 55 rotates integrally with the wastegate valve 6. Specifically, a shaft 55b is provided on the center side of the second link 55. The shaft 55b protrudes from the second link 55 in the thickness direction of the second link 55. The shaft 55b is connected to the wastegate valve 6. The shaft 55b rotates integrally with the wastegate valve 6.

[0047] During operation of the turbocharger 1-2, similarly to the above-described turbocharger 1-1, the turbine housing 21 is deformed by thermal expansion so as to rotate in the circumferential direction of the turbine wheel 22 relative to the compressor housing 31. In the link mechanism 5-2, the positional relationship between the pin 54a of the first link 54 and the pin hole 55a of the second link 55 is devised so as to realize smooth operation of the link mechanism 5-2, taking into account the deformation due to the above-described thermal expansion.

[0048] Fig. 7 is a diagram showing the positional relationship between the first link 54 and the second link 55 when the turbocharger 1-2 is stopped. Fig. 8 is a diagram showing the positional relationship between the first link 54 and the second link 55 when the turbocharger 1-2 is operating. Figs. 7 and 8 are views of the second link 52 and the third link 53 as viewed in the direction of arrow D2 in Fig. 5. Figs. 7 and 8 show only a part of the first link 54 and the second link 55 of the turbocharger 1-2, and illustration of other parts is omitted.

[0049] As shown in Fig. 7, when the turbocharger 1-2 is stopped, the central axis 54a1 of the pin 54a of the first link 54 and the central axis 55a1 of the pin hole 55a of the second link 55 are inclined relative to each other. Specifically, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are inclined relative to each other on a plane intersecting the central axis 22a of the turbine wheel 22 (for example, a plane perpendicular to the central axis 22a, or a plane slightly inclined relative to such a plane). The positional relationship in Fig. 7 corresponds to a first positional relationship in which the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are not parallel to each other.

[0050] As described above, when the turbocharger 1-2 is in operation, the turbine housing 21 is deformed by thermal expansion relative to the compressor housing 31 so as to rotate in the circumferential direction of the turbine wheel 22. As a result, the second link 55 rotates integrally with the turbine housing 21 in accordance with the thermal expansion of the turbine housing 21. On the other hand, the first link 54, which is not directly connected to the turbine housing 21, does not basically rotate in accordance with the thermal expansion of the turbine housing 21. Therefore, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22 (for example, a plane perpendicular to the central axis 22a, or a plane slightly inclined with respect to such a plane). In other words, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a rotate relatively around a rotation axis along the direction of the central axis 22a of the turbine wheel 22.

[0051] As shown in FIG. 8, when the turbocharger 1-2 is in operation, the central axis 54a1 of the pin 54a of the first link 54 and the central axis 55a1 of the pin hole 55a of the second link 55 are parallel to each other. For example, when the turbocharger 1-2 is in operation, the central axis 54a1 of the pin 54a of the first link 54 and the central axis 55a1 of the pin hole 55a of the second link 55 are coaxial. The positional relationship in FIG. 8 corresponds to a second positional relationship in which the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are closer to parallel than the first positional relationship. When the turbocharger 1-2 is stopped, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22, and the positional relationship between the pin 54a and the pin hole 55a returns to the first positional relationship in FIG. 7.

[0052] In the above, an example has been described in which central axis 54a1 of pin 54a and central axis 55a1 of pin hole 55a are parallel to each other in the second positional relationship of Fig. 8. However, in the second positional relationship, central axis 54a1 of pin 54a and central axis 55a1 of pin hole 55a only need to be closer to parallel than in the first positional relationship, and do not have to be strictly parallel to each other.

[0053] As described above, in the turbocharger 1-2, the positional relationship between the pin 54a and the pin hole 55a in the link mechanism 5-1 transitions between a first positional relationship in which the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are not parallel to each other, and a second positional relationship in which the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are closer to parallel than the first positional relationship. By transitioning the positional relationship between the pin 54a and the pin hole 55a to the second positional relationship, it is possible to suppress the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a from being inclined relative to each other. Therefore, similar to the turbocharger 1-1 described above, it is possible to realize smooth operation by the link mechanism 5-2.

[0054] In particular, in the turbocharger 1-2, the positional relationship between the pin 54a and the pin hole 55a is a first positional relationship when the turbocharger 1-2 is stopped, and a second positional relationship when the turbocharger 1-2 is operating. As a result, similar to the above-mentioned turbocharger 1-1, when the turbocharger 1-2 is operating, it is possible to appropriately suppress the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a from inclining relative to each other, and it is possible to realize smooth operation by the link mechanism 5-2.

[0055] In particular, in the turbocharger 1-2, when the positional relationship between the pin 54a and the pin hole 55a transitions between the first positional relationship and the second positional relationship, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a rotate relatively on a plane intersecting the central axis 22a of the turbine wheel 22. As a result, similarly to the above-mentioned turbocharger 1-1, taking into account the direction of deformation due to thermal expansion of the turbine housing 21, in the second positional relationship, the central axis 54a1 of the pin 54a and the central axis 55a1 of the pin hole 55a are appropriately brought into a state closer to parallel with each other than in the first positional relationship.

[0056] Particularly, in the turbocharger 1-2, the multiple links of the link mechanism 5-2 include a first link 54 that is axially expanded and contracted by the actuator 4-2, and a second link 55 that is rotatably connected to the first link 54 and rotates integrally with the movable member (the wastegate valve 6 in the above example). Therefore, smooth operation can be achieved by the link mechanism 5-2 including the first link 54 and the second link 55 as described above.

[0057] Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear that a person skilled in the art can think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure.

[0058] For example, in the above description, link mechanism 5-1 corresponds to an example in which the number of links is two, and link mechanism 5-2 corresponds to an example in which the number of links is three. However, the number of links in the link mechanism may be four or more.

[0059] For example, in the above description, an example has been described in which the wastegate valve 6 corresponds to the movable member. Therefore, in the above example, a smooth operation can be achieved by a link mechanism (e.g., link mechanisms 5-1 and 5-2) for operating the wastegate valve 6. However, the movable member may be a member other than the wastegate valve 6. For example, the movable member may be a nozzle vane that adjusts the flow path cross-sectional area in the turbine housing 21, or the like. [Explanation of symbols]

[0060] 1-1 Turbocharger 1-2 Turbocharger 4-1 Actuator 4-2 Actuator 5-1 Link mechanism 5-2 Link mechanism 6 Wastegate valve (movable part) 21 Turbine housing 22 Turbine wheel 22a Center axis 51 First link 52 Second Link 52b Pin hole 52b1 Center axis 53 Third Link 53a Pin 53a1 center axis 54 First Link 54a Pin 54a1 center axis 55 Second Link 55a Pinhole 55a1 center axis

Claims

1. An actuator; a turbine housing that houses a turbine wheel; A movable member provided in the turbine housing; a link mechanism including a plurality of links, a pin connecting two of the plurality of links to each other so as to be rotatable with respect to each other, and a pin hole into which the pin is fitted, the positional relationship between the pin and the pin hole transitioning between a first positional relationship in which a central axis of the pin and a central axis of the pin hole are not parallel to each other, and a second positional relationship in which the central axis of the pin and the central axis of the pin hole are closer to being parallel than the first positional relationship, and connecting the actuator and the movable member; Equipped with Supercharger.

2. A positional relationship between the pin and the pin hole is the first positional relationship when the turbocharger is stopped, and is the second positional relationship when the turbocharger is operating. The turbocharger according to claim 1 .

3. when a positional relationship between the pin and the pin hole transitions between the first positional relationship and the second positional relationship, a central axis of the pin and a central axis of the pin hole rotate relatively on a plane intersecting a central axis of the turbine wheel. The turbocharger according to claim 1 .

4. The movable member is a wastegate valve. The turbocharger according to claim 1 .

5. The plurality of links include: A first link that is rotated by the actuator; A second link rotatably connected to the first link; a third link rotatably connected to the second link and rotating integrally with the movable member; Including, The turbocharger according to any one of claims 1 to 4.

6. The plurality of links include: A first link that is expanded and contracted in an axial direction by the actuator; a second link rotatably connected to the first link and rotating integrally with the movable member; Including, The turbocharger according to any one of claims 1 to 4.

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