JP4415693B2 - Turbocharger - Google Patents

Description

  The present invention relates to a supercharger, and more particularly to a turbocharger equipped with a waste gate valve.

  Conventionally, a technique using a waste gate valve is known to prevent surging of a compressor of a supercharger used in a piston engine or the like (see, for example, Patent Document 1).

  The waste gate valve is configured to provide a bypass path from the upstream side to the downstream side of the turbine that rotationally drives the compressor, and to provide a valve in the bypass path. When the air pressure becomes high, the fluid is directly released from the upstream side to the downstream side of the turbine, the rotation speed of the turbine and the compressor is prevented from increasing, and surging of the compressor is prevented.

  FIG. 13 is a diagram showing a schematic configuration of a wastegate valve 100 of a conventional supercharger.

  The waste gate valve 100 includes a valve body 102, and the valve body 102 is supported by a valve body support member 104.

  Further, when the valve body support member 104 rotates in the direction of the arrow AR51, a through hole (bypass path) 108 opened in the casing 106 of the supercharger is opened and closed.

  Then, the valve body 102 and the valve body support member 104 are present at the position PS51 indicated by a solid line in FIG. 13, or the valve body 102 and the valve body support member 104 are located at a position PS53 indicated by a two-dot chain line in FIG. In this state, the through hole 108 is not closed, and a part of the fluid such as exhaust gas flows directly from the upstream side to the downstream side of the turbine without passing through the turbine. Yes.

  On the other hand, the valve body 102 and the valve body support member 104 are moved further to the left side than the state where the valve body 102 and the valve body support member 104 are present at the position PS51 indicated by a solid line in FIG. When the valve seat portion 102A and the valve seat portion 108A provided around the through hole 108 come into contact with each other, the through hole 108 is closed and fluid such as exhaust gas flows from the upstream side to the downstream side of the turbine. It does not flow directly.

  In order to move the valve element 102 of the waste gate valve, the valve element support member 104 is rotated. The valve element support member 104 is rotated by, for example, a diaphragm cylinder. Yes.

The diaphragm cylinder is driven according to the fluid pressure on the downstream side of the compressor of the supercharger. When the fluid pressure on the downstream side of the compressor is below a predetermined pressure, the valve body 102 When the through hole 108 is kept closed and the fluid pressure on the downstream side of the compressor exceeds a predetermined pressure, the valve body support member 104 and the valve body 102 move away from the through hole 108. Further, in order to make the operation of the diaphragm cylinder smooth, a frequency of several tens of hertz is provided between the downstream side of the compressor and the diaphragm cylinder. A valve (DS for turning on and off the supply of fluid such as compressed air from the downstream side of the compressor to the diaphragm cylinder. (V valve) may be provided.
Japanese Patent Publication No. 2001-304441

  A slight gap is formed between the valve body 102 of the wastegate valve of the conventional supercharger and the valve body support member 104.

  If the shape of the engaging portion between the valve body 102 of the waste gate valve and the valve body support member 104 is formed in the shape of the surface of a cylinder, the gap is the gap GP51 in the radial direction as the gap. There are gaps with the gap GP53 in the thrust direction.

  The reason why each of the gaps GP51 and GP53 is provided is that the planar valve seat portion 102A of the valve body 102 and the planar valve seat portion 108A around the through hole 108 are in close contact with each other to penetrate the valve body 102A. This is to ensure that the hole 108 can be closed.

  That is, if the gaps GP51 and GP53 do not exist, the flat valve seat portion 102A of the valve body 102 is caused by a slight decrease in processing accuracy or assembly accuracy of the valve body 102 or the valve body support member 104. This is because the planar valve seat portion 108A around the through hole 108 may not come into contact with each other on the surface, and the through hole 108 may not be reliably closed.

  If the through-hole 108 cannot be closed reliably, even when the through-hole 108 needs to be closed, there is a slight leak from the upstream side to the downstream side of the turbine. The efficiency of the turbocharger will be reduced.

  Further, if the gaps GP51 and GP53 do not exist, when the through hole 108 is closed by the valve body 102 due to a slight decrease in processing accuracy or assembly accuracy of the valve body 102 or the valve body support member 104, the valve body 102 However, there is a risk that the flat valve seat portion 108A around the through hole 108 makes point contact or line contact, and the flat valve seat portion 108A around the through hole 108 or the through hole 108 may be abnormally worn. is there.

  By the way, due to the gaps GP51 and GP53, during operation of the supercharger, the valve body 102 repeatedly hits the valve body support member 104 and the housing 106 (a part around the through hole 108) and noise is generated. There is a problem that occurs.

  More specifically, the valve body 102 and the valve body support member 104 are moved further to the left side than the state where the valve body 102 and the valve body support member 104 are present at the position PS51 shown by a solid line in FIG. When the valve seat portion 102A of the body 102 and the valve seat portion 108A provided around the through hole 108 are in contact with each other and the through hole 108 is closed, the noise is not generated.

  However, in the state where the valve body 102 and the valve body support member 104 are present at the position of PS53 indicated by a two-dot chain line in FIG. 13, vibration due to operation of the supercharger, vibration due to operation of the engine, etc. The valve body 102 and the valve body support member 104 collide with each other to generate noise.

  Further, in the state where the valve body 102 and the valve body support member 104 exist at the position of PS 51 shown by a solid line in FIG. 13, in addition to the collision between the valve body 102 and the valve body support member 104, The valve body 102 and the casing 106 repeatedly collide with each other to generate noise.

  Further, when the DSV valve as described above is provided and this DSV valve is operated, the above problem becomes more remarkable. The reason for this is that the valve body 102 is opened and closed by the DSV valve at a frequency of a dozen hertz, and the valve body 102 and the valve body support member 104 are present at the position PS51 indicated by the solid line in FIG. This is because the state changes with a period corresponding to the frequency of ten and several hertz.

  The present invention has been made in view of the above problems, and in a supercharger equipped with a wastegate valve, the generation of noise from the wastegate valve when the supercharger is operating is suppressed as much as possible. An object is to provide a supercharger that can be used.

According to the first aspect of the present invention, there is provided a turbocharger including a waste gate valve, the waste gate valve penetrating through the waste gate valve provided in the casing and connecting the upstream fluid path and the downstream fluid path of the turbine to each other. A valve body for opening and closing the waste gate valve through-hole, and a casing having a cylindrical intermediate portion, and rotatably provided in the housing, one end side of which is the tip side of the piston rod of the diaphragm cylinder A rod member that is rotatably engaged via a link member, and is provided integrally on the other end side of the rod member, supports the valve body, and has a support through hole on the tip side. the waste gate and the valve body support member for moving the valve body a valve through-hole with respect to the waste gate valve through hole to open and close, the outer peripheral surface of the intermediate portion of the valve body and the valve Anda intermediate member cylindrical provided between the inner circumferential surface of the support through hole of the supporting member, so that it can consume the collision energy between the valve body and the valve body supporting member, the intermediate The member is elastically deformable, and is formed between the outer peripheral surface of the intermediate portion of the valve body and the inner peripheral surface of the intermediate member , and between the outer peripheral surface of the intermediate member and the support through hole of the valve body support member . wherein the gap is formed between the inner peripheral surface.

According to a second aspect of the present invention, in the supercharger according to the first aspect, the valve body support member swings with a predetermined center axis provided on the base end side as a swing center axis. The valve body support member supports the valve body on the distal end side, and has a central axis formed on a plane perpendicular to the pivot center axis of the valve body support member. as the pivot center axis, the valve body relative to said valve body supporting member is characterized by being configured to rotate.

The invention described in claim 3 is the supercharger according to claim 2, the periphery of the inlet of the support through hole, drilling direction perpendicular planar inlet portion of the support member through hole provided In the vicinity of the outlet of the support through hole, there are provided flat outlet portions perpendicular to the drilling direction of the support through hole, and at both ends of the support through hole in the drilling direction. A portion of the valve body that is chamfered and has a portion for closing the through-hole for the waste gate valve and that faces the valve body support member is connected to the inlet portion. A planar portion is provided, and is a portion on the other end portion side of the valve body provided on the opposite side to the portion on the one end portion side of the valve body with the valve body support member interposed therebetween. A planar part that engages with the outlet part is provided at a part that faces the valve body support member. And it is provided.

The invention according to claim 4, in the turbocharger according to claim 2, comprising: at least one end side of the both end portions of the intermediate member in the stretching direction of the rotational axis, the times between the valve body and the valve body supporting member in the stretching direction of the dynamic center axis, wherein the another intermediate member.

  According to the present invention, in a supercharger provided with a wastegate valve, it is possible to suppress the generation of noise from the wastegate valve when this supercharger is operating as much as possible.

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a supercharger 1 and an engine E1 in which the supercharger 1 is installed according to the first embodiment of the present invention.

  The supercharger 1 includes a housing 3, a rotating shaft member 7 that rotates with respect to the housing 3 via, for example, a fluid bearing 5 inside the housing 3, and the one end portion 7 </ b> A side of the rotating shaft member 7. A centrifugal compressor (centrifugal compressor) 9 provided on the rotary shaft member 7 and a centrifugal turbine 11 provided on the other end 7B side of the rotary shaft member 7 are provided.

  The supercharger 1 is used for a reciprocating engine or a rotary engine. For example, the turbine 11 is rotationally driven by high-temperature and high-pressure exhaust gas G3 emitted from a 4-cycle piston engine E1, and the compressor (compressor) is rotated by this rotation. 9 is driven to rotate, and compressed air G1 obtained by the rotation of the compressor 9 is supplied to the engine E1.

  The compressed air G1 is used for the combustion of fuel in the cylinder of the engine E1, and the combustion discharges the high-temperature and high-pressure exhaust gas (combustion gas for rotating the turbine 11) G3. is there.

  The supercharger 1 is provided with a waste gate valve 13 for preventing the compressor 9 from surging.

  Here, the configuration of the waste gate valve 13 will be described with an example.

  The waste gate valve 13 includes a diaphragm cylinder 15 that is operated by compressed air compressed by the compressor 9 (compressed air before being supplied to the engine E1). A valve body 19 is provided on the tip end 17 </ b> A side of the piston rod 17 of the diaphragm cylinder 15.

  The casing 3 is provided with a waste gate valve through-hole 25 that connects between the upstream fluid path 21 and the downstream fluid path 23 of the turbine 11 of the turbocharger 1. The piston rod 17 moves in the direction of the arrow AR1 so that the waste gate valve through hole 25 can be opened and closed by the valve body 19.

  When the pressure of the compressed air compressed by the compressor 9 does not exceed a predetermined pressure, the valve body 19 is forced through the through hole 25 by being urged by the compression spring 27 provided in the diaphragm cylinder 15. It is supposed to close.

  On the other hand, when the pressure of the compressed air compressed by the compressor 9 exceeds a predetermined pressure, the valve cylinder 19 is separated from the through hole 25 and the through hole 25 is opened by the diaphragm cylinder 15. The exhaust gas G3 is directly discharged from the upstream fluid path 21 to the downstream fluid path 23 of one turbine 11 without passing through the turbine 11.

  In this way, the exhaust gas G3 is directly discharged, so that the rotational speed of the turbine 11 can be reduced, the rotational speed of the compressor 9 is reduced, and excessive compressed air is prevented from being given to the engine E1. Can be done.

  Next, the installation state of the valve body 19 on the distal end portion 17A side of the piston rod 17 and the relationship between the valve body 19 and the through hole 25 will be described.

  FIG. 2 is a view for explaining the installation state of the valve body 19 on the tip end 17A side of the piston rod 17, the relationship between the valve body 19 and the through hole 25, and the like, and FIG. FIG. 4 is a diagram showing a cross section of IVA-IVB in FIG.

A cylindrical rod member 29 is rotatably provided in the housing 3, and one end of a rod-shaped link member 31 is disposed on one end portion (an outer end portion of the housing 3) side of the rod member 29. The part side is provided integrally, and the tip end part 17A side of the piston rod 17 is rotatably engaged with the other end part side of the rod-shaped link member 31. In other words, one end portion side of the rod member 29 is engaged with the distal end portion 17A side of the piston rod 17 via the link member 31 so as to be rotatable.

  In addition, a valve body support member 33 that supports the valve body 19 on one end side is integrally formed on the other end side of the rod member 29 on the other end (end inside the housing 3) side. Is provided.

  Then, when the piston rod 17 moves in the direction of the arrow AR1 shown in FIG. 2, the rod member 29 swings about the swing center axis CL1 and the valve body 19 penetrates by the swing. The hole 25 is opened and closed.

  Note that the movement amount of the piston rod 17 is small, and there is a slight gap in the engaging portion between the other end portion side of the rod-shaped link member 31 and the tip portion 17A side of the piston rod 17. Therefore, even if the main body 15A of the diaphragm cylinder 15 is integrally fixed to the housing 3, the rod member 29 can be swung.

  The other end side of the rod member 29, the valve body 19, and the valve body support member 33 are provided in the downstream fluid path 23 of the turbine 11 of the supercharger 1.

  As described above, the valve body support member 33 supports the valve body 19, and opens and closes the valve body 19 with respect to the waste gate valve through hole 25 to open and close the waste gate valve through hole 25. As shown in FIG. 4, an intermediate member 35 is provided between the valve body 19 and the valve body support member 33.

The intermediate member 35 is elastically deformable so that the collision energy between the valve body 19 and the valve body support member 33 can be consumed, and the outer peripheral surface of the intermediate portion 19F of the valve body 19 and the inner peripheral surface of the intermediate member 35 gap GP1 together with are formed, is formed a gap GP3 also between the inner circumferential surface of the support member through hole 33A of the outer peripheral surface and the valve body support member 33 of the intermediate member 35 is provided between the .

  Further, as described above, the valve body support member 33 swings with respect to the housing 3 with the predetermined swing center axis CL1 provided on the base end (other end) side as the swing center axis. Moreover, the said valve body support member 33 is supporting the said valve body 19 by the front-end | tip part (one end part) side.

  The intermediate member 35 is formed of a cylindrical member, and the valve body support member 33 has a central axis CL3 formed on a plane perpendicular to the swinging central axis CL1 as a rotation central axis. The valve body 19 is configured to rotate with respect to the body support member 33.

  Note that slight gaps GP5 and GP7 are also formed in the extending direction of the central axis CL3 (the thrust direction of the valve body 19).

  4 shows a state in which the through hole 25 is closed by the valve body 19, the valve body support member 33 and the valve body 19 are actually in contact with each other, but for convenience of explanation. The valve body support member 33 and the valve body 19 are shown separated from each other.

  Further, when the valve body support member 33 moves to the right from the state shown in FIG. 4, the valve body 19 is located at a position corresponding to the position PS51 or the position PS53 shown in FIG.

  The operation of the valve body 19 and the like in a state where the valve body 19 is located at a position corresponding to the position PS51 and the position PS53 shown in FIG.

  FIG. 5 is a view showing the valve body 19, the valve body support member 33, and the intermediate member 35 of the supercharger 1, and is a view showing a VA-VB cross section in FIG. 4.

  FIG. 6 is a view showing the valve body 102 and the valve body support member 104 of the conventional supercharger 100, and is a view showing a VIA-VIB cross section in FIG.

  First, consider the case where the valve body 19 moves in the direction of the arrow AR3 shown in FIG. The valve body 19 first collides with the intermediate member 35, and due to this collision, the intermediate member 35 moves in the direction of the arrow AR 5 and collides with the valve body support member 33. That is, the valve body 19 collides with the valve body support member 33 via the intermediate member 35.

  On the other hand, in the conventional turbocharger 100, considering the case where the valve body 19 moves in the direction of the arrow AR7 shown in FIG. 5 due to the vibration of the valve body 19, the valve body 19 directly collides with the valve body support member 33. .

  Therefore, in the supercharger 1, the collision energy is consumed to some extent due to the elastic deformation and damping of the intermediate member 35 at the time of collision through the intermediate member 35, and as a result, the valve body 102 as in the conventional supercharger 1. As compared with the case where the valve directly collides with the valve body support member 104, generation of noise due to chattering can be suppressed.

  Further, as shown in FIG. 4, the valve body support member 33 is provided with a support body through hole 33 </ b> A that is a cylindrical through hole that engages with the outer diameter of the intermediate member 35. Around the inlet 33B of the hole 33A, an annular and planar inlet portion 33C perpendicular to the drilling direction of the support through hole 33A (the thrust direction of the through hole 33A) is provided. Around the outlet 33D of 33A, an annular and planar outlet portion 33E perpendicular to the perforating direction of the support through hole 33A (thrust direction of the through hole) is provided. Both ends (inlet 33B, outlet 33D) in the drilling direction are chamfered.

  The part 19B on one end side of the valve body 19 provided with a part 19A for closing the through-hole 25 for the waste gate valve is in surface contact with the inlet part 33C on the part 19B facing the valve body support member. Thus, an annular and planar portion 19C that is engaged is provided.

  A portion on the other end side of the valve body 19 provided on the opposite side to the portion 19B on the one end portion side of the valve body 19 across the valve body support member 33, and is opposed to the valve body support member 33. The part 19D that is to be provided is provided with an annular and flat part 19E that engages in surface contact with the outlet part 33E.

  An intermediate portion 19F (intermediate portion existing between the one end portion portion 19B and the other end portion portion 19D) of the valve body 19 engages with the inner diameter of the intermediate member 35 and is formed in a cylindrical shape. Has been.

  Therefore, the engaging portion between the valve body support member 33 and the intermediate member 35 is formed in a cylindrical side surface shape, and the engaging portion between the intermediate member 35 and the valve body 19 is formed in a cylindrical side surface shape. Has been.

  The distance L1 between the inlet portion 33C and the outlet portion 33E of the through hole 33A is slightly shorter than the length L3 of the intermediate member 35, and the length L3 of the intermediate member 35 is It is slightly shorter than the distance L5 between the portions 19C and 19E.

  Next, the case where the valve body 19 moves from the state shown in FIG. 4 and collides with the valve body support member 33 via the intermediate member 35 will be described.

  When the valve body 19 collides with the valve body support member 33 via the intermediate member 35, the valve body 19 does not normally collide with the valve body support member 33 and the valve body 19 tilts obliquely. Move and collide.

  That is, for example, the part PT1 of the valve body 19 collides with the part (part of one end portion of the inner diameter) PT3 of the intermediate member 35, and the part PT5 of the outer diameter of the intermediate member 35 is chamfered by the valve body support member 33. Collides with PT7.

  Here, when the part PT5 collides with the part PT7, since the part PT7 is chamfered, that is, the part PT5 collides with the obtuse angle part PT7, the part PT5 collides with the part that is not chamfered. The collision energy is more dispersed than the case, that is, the collision energy can be distributed and received by the valve body support member 33, and therefore, the chattering sound when the intermediate member 35 and the valve body support member 33 collide with each other. Can be reduced.

  A chamfer similar to the chamfer provided on the valve body support member 33 may be provided on the intermediate member 35.

According to the wastegate valve 13 of the supercharger 1, the intermediate member 35 is provided between the valve body 19 and the valve body support member 33, and the outer peripheral surface of the intermediate portion 19 </ b> F of the valve body 19 and the intermediate member 35 . with a gap GP1 is formed between the peripheral surface, also the gap GP3 between the outer circumferential surface of the intermediate member 35 and the inner peripheral surface of the support member through hole 33A of the valve body supporting member 33 is formed Therefore, as described above, when the supercharger 1 is operating, the noise (chattering sound; impact generated by the waste gate valve 13 due to the valve body 19 and the valve body support member 33 repeatedly colliding with each other. Sound) and the degree of freedom of the position and posture of the valve body 19 relative to the valve body support member 33 can be maintained by the presence of the gaps GP1, GP3, etc. Closed Rukoto can, can be prevented per polarization of the valve body 19 and the casing 3, it is possible to prevent abnormal wear of the valve body 19 and the housing 3.

  Further, the collision energy between the valve body 19 and the valve body support member 33 is reduced, and similarly, the collision energy between the valve body 19 and the housing 3 is also reduced. Therefore, the valve body 19 and the valve body support member due to the repeated collisions described above. 33 and the wear of the housing 3 can be suppressed as much as possible.

  Further, according to the waste gate valve 13 of the supercharger 1, the valve body support member 33 swings and moves the valve body 19, so that the valve body support member 33 moves linearly, for example. The valve body 19 can be moved with a simpler configuration than the case.

  Further, since the intermediate member 35 is cylindrical, it can be easily manufactured, and any of the intermediate member 35 orthogonal to the rotation center axis CL3 of the valve body 19 and separated from the rotation center axis CL3 of the valve body 19 can be used. Also in the direction, it becomes easy to make the size of the gap between the valve body 19 and the valve body support member 33 almost constant, and the valve body regardless of the moving direction when the valve body 19 collides. 19 uniformly collides with the valve body support member 33, and noise can be suppressed.

  Further, according to the waste gate valve 13 of the supercharger 1, the engagement portion between the valve body 19 and the intermediate member 35 and between the intermediate member 35 and the valve body support member 33 is cylindrical. Since the engaging portions (engaging portions such as the portions 19C, 19E, 33C, and 33E) at the ends in the extending direction of the moving center axis CL3 are formed in a ring shape and a flat shape, the valve body 19 and the valve body support The manufacture of the member 33 and the intermediate member 35 is facilitated, and the collision between the valve body 19 and the valve body support member 33 in the extending direction of the support body through-hole 33A (the extending direction of the rotation center axis CL3 of the valve body 19). A part can be formed by a surface, and it becomes easy to absorb collision energy and can reduce noise.

[Second Embodiment]
FIG. 7 is a cross-sectional view showing a state of an engaging portion between the valve body 19 and the valve body support member 33 in the wastegate valve of the supercharger according to the second embodiment of the present invention, and corresponds to FIG. FIG.

  In the engaging portion between the valve body 19 and the valve body support member 33 according to the second embodiment, the intermediate member 37 is also formed in the extending direction of the support body through-hole 33A (the extending direction of the rotation center axis CL3 of the valve body 19). Is different from that according to the first embodiment, and the other points are configured in substantially the same manner as those according to the first embodiment.

  That is, according to the second embodiment, the valve body 19 is on one end side of the intermediate member 35 in the extending direction of the rotation center axis CL3 and in the extending direction of the rotation center axis CL3. For example, a ring-shaped intermediate member 37 is provided between the body 19 and the valve body support member 33.

  The intermediate member 37 may be formed integrally with the intermediate member 35 or may be constituted by a separate member.

  Further, as shown in FIG. 8 (a diagram showing a modification of the second embodiment), the other end side of the intermediate member 35 in the extending direction of the rotation center axis CL3 of the valve body 19 is the above-described rotation. For example, a ring-shaped intermediate member 39 may be provided between the valve body 19 and the valve body support member 33 in the extending direction of the moving center axis CL3.

  According to the wastegate valve of the supercharger according to the second embodiment, at least one end of the both ends of the intermediate member 35 in the extending direction of the rotation center axis CL3, the rotation Since the intermediate members 37 and 39 are provided between the valve body 19 and the valve body support member 33 in the extending direction of the central axis CL3, chattering noise is generated in the extending direction of the rotating central axis CL3. This can be suppressed similarly to the case shown in FIG.

[Third Embodiment]
FIG. 9 is a cross-sectional view showing a state of the engaging portion between the valve body 39 and the valve body support member 41 in the wastegate valve of the supercharger according to the third embodiment of the present invention, and corresponds to FIG. FIG.

  FIG. 10 is a diagram showing an X arrow view in FIG. 9.

  In the engaging portion between the valve body 39 and the valve body support member 41 according to the third embodiment, the amount of rotation of the valve body 39 around the rotation center axis CL3 of the valve body 39 is suppressed. Unlike the first embodiment and the second embodiment, the other points are substantially the same as those according to the first embodiment and the second embodiment.

  That is, according to the third embodiment, a slight gap is formed between the valve body 39 and the valve body support member 41 as described above, and the swing center of the valve body support member 41 is Even if the valve element 39 is rotated with respect to the valve element support member 41 with a central axis CL3 formed on a plane perpendicular to the axis CL1 as a rotation center axis, the waste gate is independent of the rotation angle. The valve element 39 is formed in a shape (for example, a circular shape) that can close the valve through hole 25, and the valve element support member 41 is centered on the rotation center axis CL3. The valve body 39 is configured not to rotate more than a predetermined slight angle.

  More specifically, the shape of the valve body support member 41 is non-circular (the shape of the support through-hole 41A formed by a plane perpendicular to the extending direction of the rotation center axis CL3 of the valve body 39 is, for example, two circles parallel to each other). An intermediate portion 39F of the valve body 39 that is formed in a straight line (a shape that can be formed in the center when cut by two straight lines symmetrical to each other with respect to the center of the circle) and that engages with the through hole 41A. In addition, since the valve body 39 is formed in a similar shape slightly smaller than the above shape, the valve body 39 is more than a predetermined slight angle with respect to the valve body support member 41 with the rotation center axis CL3 as the rotation center. It is designed not to rotate.

  Furthermore, according to the third embodiment, a slight gap is formed between the valve body 39 and the valve body support member 41, so that the valve body 39 is connected to the valve body support member 41. On the other hand, it is relatively slightly movable.

  Further, a planar portion 25A is provided around the waste gate valve through hole 25, and the valve body 39 engages with the planar portion 25A around the waste gate valve through hole 25. A circular and planar portion 39A is provided, and the waste gate valve through hole 25 is closed when the planar portions 25A and 39A come into surface contact with each other.

  Further, a central axis CL5 parallel to a straight line generated by intersecting a plane perpendicular to the swinging central axis CL3 of the valve body support member and a plane of the planar portion 39A of the valve body 39 is a first axis. And the central axis parallel to the swing central axis CL1 is the second central axis CL7, and the central axis perpendicular to the plane of the planar portion 39A of the valve body 39 (the first axis The first rotation center when CL3 is the third rotation center axis that is perpendicular to the first rotation center axis CL5 and perpendicular to the second rotation center axis CL7. The amount of rotation of the valve body 39 with respect to the valve body support member 41 with the center axis CL5 as the rotation center is the valve body with respect to the valve body support member 41 with the second rotation center axis CL7 as the rotation center. 39 is configured to be smaller than the rotation amount of 39, and during the third rotation It is made smaller than the amount of rotation of the valve body 39 in the axial CL3 against rotation center with the valve body supporting member 41.

  That is, for example, the valve body support member 41 is provided with a support body through hole 41A that is a cylindrical through hole that engages with the valve body 39, and the periphery of the inlet 41B of the support body through hole 41A. Is provided with a flat inlet portion 41C perpendicular to the drilling direction of the support through hole 41A (the thrust direction of the support through hole 41A), and around the outlet 41D of the support through hole 41A. A planar outlet portion 41E perpendicular to the perforating direction of the support through hole 41A (the thrust direction of the support through hole 41A) is provided.

  Further, a portion 39B on one end side of the valve body 39 provided with a portion 39A for closing the waste gate valve through hole 25 and facing the valve body support member 41 is an inlet portion 41C. Of the valve body 39 provided on the opposite side to the part 39B on one end side of the valve body 39 with the valve body support member 41 interposed therebetween. A portion 39E on the other end side, which is the portion 39E facing the valve body support member 41, is planar so as to be brought into surface contact with and engage with the outlet portion 41E.

  An intermediate portion 39F (intermediate portion existing between the one end portion 39B and the other end portion 39D) 39F engages with the inner diameter of the support through hole 41A and is formed in a columnar shape. A planar portion 39A of the valve body 39 that engages with the planar portion 25A around the through-hole 25 for the waste gate valve, a planar portion 39C that engages with the inlet portion 41C, and the outlet portion 41E. The planar portion 39E that engages with the inlet portion 41C and the outlet portion 41E are substantially parallel to each other.

  Further, at least one of the inlet portion 41C and the outlet portion 41E has a protrusion (the flat surface) arranged side by side in the extending direction of the second rotation center axis CL7 with the support through hole 41A interposed therebetween. (Protrusions in contact with the planar portion 39C and the planar portion 39E).

  In the third embodiment, an intermediate member 35, an intermediate member 37, and an intermediate member 39 may be provided as in the first embodiment and the second embodiment.

  According to the wastegate valve of the supercharger according to the third embodiment, a slight gap is formed between the valve body 39 and the valve body support member 41, and the valve body as the rotation center axis CL3. The valve element 39 is formed in such a shape that the waste gate valve through hole 25 can be closed regardless of the rotation angle even if the valve element 39 rotates with respect to the valve element support member 41. However, since the valve body 39 is configured not to rotate more than a predetermined slight angle with respect to the valve body support member 41 with the rotation center axis CL3 as the rotation center, that is, the valve body 39 is Although the function of closing the through-hole 25 for the waste gate valve is not impaired even if it rotates, the amount of rotation of the valve element 39 is suppressed.

  Therefore, generation of noise due to the valve body 39 rotating indefinitely with respect to the valve body support member 41 can be eliminated. That is, when the valve body 39 rotates infinitely, the rotation speed may gradually increase and noise may increase. However, since the rotation amount is suppressed, the rotation speed does not increase gradually and noise is generated. Can be suppressed.

  Further, according to the wastegate valve of the supercharger according to the third embodiment, the rotation amount of the valve body 39 relative to the valve body support member 41 with the first rotation center axis CL5 as the rotation center is set. The amount of rotation of the valve body 39 relative to the valve body support member 41 with the second rotation center axis CL7 as the rotation center, and the valve body support with the third rotation center axis CL3 as the rotation center Since the rotation amount of the valve body 39 with respect to the member 41 is smaller than the rotation amount of the valve body 39 with the first rotation center axis CL5 as the rotation center (amount of rattling), Noise generated from the valve body 39, the valve body support member 41, and the like can be suppressed.

  Even if the amount of rotation about the first rotation center axis CL5 is reduced, one end side of the valve body 39 in the extending direction of the swing center axis CL1 of the valve body support member 41 is provided. Unlike the case where the amount of rotation on the one end side and the other end side of the valve body 39 in the extending direction of the first rotation center axis CL5 is reduced. The function of the valve body 39 closing the waste gate valve through hole 25 is less likely to be hindered.

  Further, according to the wastegate valve of the supercharger according to the third embodiment, by providing the protrusion 43, the valve body support member 41 with the first rotation center axis CL5 as the rotation center is provided. Since the amount of rotation of the valve body 39 is reduced, the generation of noise can be prevented with a simple configuration.

  As shown in FIG. 10, the protrusion 43 has a shape formed continuously in the extending direction of the second rotation center axis CL7. Therefore, the protrusion 43 is machined (for example, end milled). ) And the surface pressure when the projection 43 and the valve body 39 come into contact with each other can be reduced.

  The protrusion 43 may be provided on the valve body 39 instead of the valve body support member 41.

  FIG. 11 is a cross-sectional view illustrating a modified example of the engagement portion between the valve body and the valve body support member in the wastegate valve of the supercharger according to the third embodiment, and corresponds to FIG. 4.

  FIG. 12 is a view showing the XII arrow in FIG.

  A columnar engagement portion 45A extending in the extending direction of the second rotation center axis CL7 is provided on one end side of the valve body 45 of the modified example. Is provided with a through hole in a cylindrical shape that engages with the engaging portion 45A.

  The engagement portion 45A is provided with a key 49, and the valve body support member 47 is engaged with the key 49, and an engagement portion 47A having a width wider than the width of the key 49 is provided. Yes. And the valve body 45 carries out the same behavior as the case shown in FIG.9 and FIG.10.

It is a figure which shows schematic structure of the supercharger which concerns on the 1st Embodiment of this invention, and the engine in which this supercharger is installed. It is a figure explaining the installation state of the valve body in the front-end | tip part side of a piston rod, the relationship between a valve body, and a through-hole. It is a figure which shows the III arrow in FIG. It is a figure which shows the IVA-IVB cross section in FIG. FIG. 5 is a view showing a valve body, a valve body support member, and an intermediate member of the supercharger, and is a view showing a VA-VB cross section in FIG. 4. It is a figure showing the valve body and valve body support member of the conventional supercharger, and is a figure showing a VIA-VIB section in FIG. It is sectional drawing which shows the state of the engaging part of the valve body and valve body support member in the wastegate valve | bulb of the supercharger which concerns on the 2nd Embodiment of this invention, and is a figure corresponding to FIG. It is a figure which shows the modification of 2nd Embodiment. It is sectional drawing which shows the state of the engaging part of the valve body and valve body support member in the wastegate valve of the supercharger which concerns on the 3rd Embodiment of this invention, and is a figure corresponding to FIG. It is a figure which shows the X arrow view in FIG. It is sectional drawing which shows the modification of the engaging part of the valve body and valve body support member in the wastegate valve of the supercharger which concerns on 3rd Embodiment, and is a figure corresponding to FIG. It is a figure which shows the XII arrow in FIG. It is a figure which shows schematic structure of the waste gate valve of the conventional supercharger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supercharger 3 Case 9 Compressor 11 Turbine 13 Waste gate valve 19 Valve body 25 Waste gate valve through-hole 33 Valve body support member 35 Intermediate member CL1 Oscillation center axis CL3, CL5, CL7 Rotation center axis GP1, GP3 , GP5, GP7 gap

Claims (4)

In a turbocharger equipped with a wastegate valve,
A waste gate valve through hole provided in the housing and connecting between the upstream fluid path and the downstream fluid path of the turbine ;
A valve body for opening and closing the through hole for the waste gate valve , comprising a cylindrical intermediate portion ;
A rod member which is rotatably provided in the housing, and whose one end side is rotatably engaged with a distal end side of a piston rod of the diaphragm cylinder via a link member;
The waste gate valve is provided integrally on the other end side of the rod member, supports the valve body, has a support through hole on the tip end side, and opens and closes the waste gate valve through hole. A valve body support member for moving the valve body with respect to the through hole for use ;
Anda intermediate member cylindrical provided between the inner circumferential surface of the support through hole of the outer peripheral surface and the valve body supporting member of the intermediate portion of said valve body,
The intermediate member is elastically deformable so that collision energy between the valve body and the valve body support member can be consumed, and an outer peripheral surface of the intermediate portion of the valve body and an inner peripheral surface of the intermediate member And a gap formed between the outer peripheral surface of the intermediate member and the inner peripheral surface of the support body through hole of the valve body support member. The turbocharger according to claim 1, wherein
The valve body support member is configured to swing with a predetermined central axis provided on the base end side as a swing center axis, and the valve body support member is configured to move the valve body on the distal end side. Supports the body,
The valve body is configured to rotate with respect to the valve body support member, with a center axis formed on a plane perpendicular to the pivot center axis of the valve body support member as a rotation center axis. A turbocharger characterized by The turbocharger according to claim 2,
Above around the inlet of the support through hole is drilled direction perpendicular planar inlet portion of the support member through hole is provided on the periphery of the outlet of the support through hole, the support through A planar exit portion perpendicular to the hole perforation direction is provided, and both ends of the support through hole in the perforation direction are chamfered,
A portion on one end side of the valve body having a portion for closing the through hole for the waste gate valve and facing the valve body support member is a flat portion engaged with the inlet portion. Provided on the other end side of the valve body provided on the opposite side of the valve body support member with the valve body support member sandwiched between the valve body support member and the valve body support member. the portion facing the supercharger, wherein the planar portion for engagement with the exit site is provided. The turbocharger according to claim 2,
And at least one end side of the both end portions of the intermediate member in the stretching direction of the rotational axis, between the valve body and the valve body supporting member in the stretching direction of the rotational axis Is a turbocharger characterized in that another intermediate member is provided.

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