Variable displacement mechanism and supercharger

Abstract

The variable capacity mechanism includes: a plurality of nozzle blades; a nozzle ring disposed separately from each other along the axis of the plurality of nozzle blades in a manner that clamps the plurality of nozzle blades; and a drive ring disposed on the nozzle ring support surface side of the nozzle ring opposite to the flow path forming surface of the nozzle ring facing the plurality of nozzle blades, and capable of rotating about the rotation axis of the turbine impeller while in contact with the nozzle ring. At least one of a first portion in the nozzle ring that contacts the drive ring and a second portion in the drive ring that contacts the nozzle ring is provided with a removal structure for removing deposits adhering to the first portion of the nozzle ring and / or the second portion of the drive ring.

Description

Technical Field

[0001] This disclosure relates to variable capacity mechanisms. Background Technology

[0002] To improve turbocharger efficiency, the flow rate and velocity of the gas supplied to the turbine impeller are sometimes adjusted. The mechanism used for such adjustments is called a variable capacity mechanism or a variable nozzle unit. For example, Patent Document 1 discloses a technology for a variable capacity turbocharger equipped with a variable nozzle mechanism.

[0003] Patent Document 1: Japanese Patent No. 5409741

[0004] A variable capacity mechanism changes the area of ​​the flow path for gas flow and alters the direction of gas flow. The gas flow path is formed by multiple nozzle blades arranged along an imaginary circle. By rotating the nozzle blades, the variable capacity mechanism changes the area of ​​the flow path formed between the nozzle blades and thus alters the direction of gas flow. In other words, the variable capacity mechanism includes a movable part whose relative position changes.

[0005] The gas supplied to the booster contains fine impurities such as dust. Since the variable capacity mechanism is exposed to the gas, dust gradually accumulates within it over time. This accumulated dust in the movable parts may obstruct the movement of opposing components. If the movement of these components is impaired, the variable capacity mechanism's ability to adjust the flow path area and flow direction is compromised. Summary of the Invention

[0006] This disclosure describes a variable capacity mechanism capable of maintaining and adjusting the flow path area and flow direction, as well as a booster equipped with the variable capacity mechanism.

[0007] One aspect of the variable capacity mechanism disclosed herein includes: a plurality of nozzle blades forming a plurality of flow paths guiding gas from a vortex flow path to a turbine impeller; a first plate member and a second plate member disposed separately from each other along the axes of the plurality of nozzle blades in a manner that clamps the plurality of nozzle blades; and a drive ring disposed on a support surface side of the second plate member opposite to the flow path forming surface of the second plate member facing the plurality of nozzle blades, and capable of rotating about the rotation axis of the turbine impeller while in contact with the second plate member. At least one of a first portion in the second plate member that contacts the drive ring and a second portion in the drive ring that contacts the second plate member is provided with a removal portion for removing deposits adhering to the first portion in the second plate member and / or the second portion in the drive ring.

[0008] The variable capacity mechanism has a removal portion disposed at least on one of a first portion in the second plate component that contacts the drive ring, and a second portion in the drive ring that contacts the second plate component. The removal portion can remove deposits adhering to the first portion in the second plate component and / or the second portion in the drive ring. As a result, the movement of the drive ring relative to the second plate component is not hindered by deposits, thus maintaining the function of adjusting the flow path area and flow direction.

[0009] In the aforementioned variable capacity mechanism, the first portion can be the support surface of the second plate component. The second portion can be the contact surface of the drive ring that contacts the support surface of the second plate component. According to this structure, it is possible to remove any deposits adhering to the support surface of the second plate component and the contact surface of the drive ring.

[0010] In the aforementioned variable capacity mechanism, the removal part may be a textured surface provided on at least one of the support surface and the contact surface. According to this structure, the attached material can be scraped off by the textured surface provided on at least one of the support surface and the contact surface.

[0011] In the aforementioned variable capacity mechanism, the second plate component may include a drive ring support portion protruding from the support surface. The drive ring support portion may include a support outer peripheral surface located inside the drive ring and in contact with the inner circumferential surface of the drive ring. A first portion may be the support outer peripheral surface of the second plate component. A second portion may be the inner circumferential surface of the drive ring. According to the above structure, adhering material between the support outer peripheral surface of the second plate component and the inner circumferential surface of the drive ring can be removed.

[0012] In the aforementioned variable capacity mechanism, the first portion may be a portion on the outer peripheral surface of the support that faces the inner peripheral surface of the ring in a manner that allows it to contact the inner peripheral surface of the ring. The second portion may be a portion on the inner peripheral surface of the ring that faces the outer peripheral surface of the support in a manner that allows it to contact the outer peripheral surface of the support. According to the above structure, deposits attached to both the portion on the outer peripheral surface of the support that can contact the inner peripheral surface of the ring and the portion on the inner peripheral surface of the ring that can contact the outer peripheral surface of the support can be removed.

[0013] In the aforementioned variable capacity mechanism, the removal section may be a textured surface with concave and convex surfaces provided at least on one of the portion facing the inner circumference of the ring and the portion facing the outer circumference of the support. According to this structure, the textured surface can scrape off adhering substances.

[0014] In the aforementioned variable capacity mechanism, the removal section can be a support notch located on the inner circumferential surface of the drive ring and not in contact with the outer circumferential surface of the support. Alternatively, the removal section can be a support notch located on the outer circumferential surface of the drive ring support and not in contact with the inner circumferential surface of the ring. According to this structure, adhering material can be discharged from the support notch.

[0015] In the aforementioned variable capacity mechanism, the inner circumferential surface of the drive ring may include: a contact inner circumferential surface that can contact the outer circumferential surface of the support, and a notched inner circumferential surface that cannot contact the outer circumferential surface of the support. The second portion may be a ridge portion connecting the contact inner circumferential surface and the notched inner circumferential surface. According to this structure, it is possible to scrape off adhering substances.

[0016] As another aspect of the present disclosure, the turbocharger includes: a turbine impeller; a housing including a flow path for receiving gas flow from an inlet; and a variable capacity mechanism disposed in the housing and receiving gas from the flow path and guiding it to the turbine impeller. The variable capacity mechanism includes: a plurality of nozzle blades forming a plurality of flow paths guiding gas from the vortex flow path to the turbine impeller; a first plate member and a second plate member disposed separately from each other along the axes of the plurality of nozzle blades, clamping the plurality of nozzle blades; and a drive ring disposed on a support surface side of the second plate member opposite to the flow path forming surface of the second plate member facing the plurality of nozzle blades, and capable of rotating about the rotation axis of the turbine impeller while in contact with the second plate member. At least one of a first portion in the second plate member in contact with the drive ring and a second portion in the drive ring in contact with the second plate member is provided with a removal portion for removing deposits adhering to the first portion of the second plate member and / or the second portion of the drive ring. This turbocharger includes the aforementioned variable capacity mechanism. As a result, the function of adjusting the flow path area and flow direction can be maintained, thereby maintaining the performance of the turbocharger.

[0017] The variable capacity mechanism disclosed herein, and the booster equipped with the variable capacity mechanism, are capable of maintaining the adjustment function of flow path area and flow direction. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a booster with a variable capacity mechanism having an implementation method.

[0019] Figure 2 It is a 3D diagram of a variable mechanism.

[0020] Figure 3 It is a three-dimensional view showing the nozzle ring and drive ring disassembled and viewed from the main face side of the drive ring.

[0021] Figure 4 (a) is a plan view showing the first removal section enlarged. Figure 4 (b) is a perspective view showing the first removal part magnified.

[0022] Figure 5 This is a three-dimensional view showing the second removal section magnified.

[0023] Figure 6 It is a three-dimensional view showing the nozzle ring and drive ring disassembled and viewed from the back side of the drive ring.

[0024] Figure 7 This is a three-dimensional view showing the third removal section magnified.

[0025] Figure 8 (a) Figure 8 (b) Figure 8 (c) Figure 8 (d) and Figure 8 (e) is a diagram showing a modified example of the first removal section.

[0026] Figure 9 (a) is a diagram showing the cross-sectional shape of the second removal section according to the embodiment. Figure 9 (b) and Figure 9 (c) is a diagram showing a modified example of the cross-sectional shape of the second removal section.

[0027] Figure 10 (a) Figure 10 (b) and Figure 10 (c) is a diagram showing a modified example of the second removal section. Detailed Implementation

[0028] Hereinafter, the manner in which a variable capacity mechanism, as an example of this disclosure, and a booster equipped with the variable capacity mechanism are described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are labeled with the same symbols, and repeated descriptions are omitted.

[0029] Hereinafter, with reference to the accompanying drawings, a variable capacity mechanism as an example of the present disclosure and an embodiment of a turbocharger having the variable capacity mechanism will be described in detail. Figure 1 This is a cross-sectional view of the rotation axis H including the variable capacity turbocharger 1. The turbocharger 1 is used, for example, in the internal combustion engine of a ship or vehicle.

[0030] like Figure 1 As shown, the turbocharger 1 includes a turbine 2 and a compressor 3. The turbine 2 includes a turbine housing 4 and a turbine impeller 2T housed within the turbine housing 4. The turbine housing 4 has a vortex flow path 16 extending circumferentially around the turbine impeller 2T. The compressor 3 includes a compressor housing 12 and a compressor impeller 3T housed within the compressor housing 12. The compressor housing 12 has a vortex flow path 17 extending circumferentially around the compressor impeller 3T.

[0031] The turbine impeller 2T is located at one end of the rotating shaft 14, and the compressor impeller 3T is located at the other end of the rotating shaft 14. A bearing housing 13 is provided between the turbine housing 4 and the compressor housing 12. The rotating shaft 14 is rotatably supported on the bearing housing 13 via bearings 15. The rotating shaft 14, the turbine impeller 2T, and the compressor impeller 3T rotate as a single rotating body around the rotation axis H.

[0032] The turbine housing 4 is provided with an exhaust gas inlet 10a and an exhaust gas outlet 10b. The exhaust gas discharged from the internal combustion engine flows into the turbine housing 4 through the exhaust gas inlet 10a, flows into the turbine impeller 2T through the vortex flow path 16, and causes the turbine impeller 2T to rotate. Afterwards, the exhaust gas flows out of the turbine housing 4 through the exhaust gas outlet 10b.

[0033] The compressor housing 12 is provided with an intake port 11a and an outlet port 11b. As described above, if the turbine impeller 2T rotates, the compressor impeller 3T will rotate via the rotating shaft 14. The rotating compressor impeller 3T draws in outside air through the intake port 11a. This air is compressed by the compressor impeller 3T and the vortex flow path 17, and discharged from the outlet port 11b. The compressed air discharged from the outlet port 11b is supplied to the aforementioned internal combustion engine.

[0034] The turbine 2 of the supercharger 1 will be further explained. In the following description, when referred to only as "axial," "radial," and "circumferential," they respectively refer to the direction of the rotation axis (rotation axis H direction), the radial direction, and the circumferential direction of the turbine impeller 2T. When referred to as "upstream," "downstream," etc., they refer to the upstream and downstream of the exhaust gas in the turbine 2. In the direction of the rotation axis H, sometimes the turbine 2 side of the supercharger 1 ( Figure 1 The left side of the compressor is referred to as the "turbine side". Figure 1 The right side (of the middle section) is referred to as the "compressor side".

[0035] A nozzle flow path 19 is provided on the turbine 2 of the turbocharger 1, which connects the vortex flow path 16 disposed around the turbine impeller 2T to the turbine impeller 2T. A plurality of movable nozzle blades 21 are provided on the nozzle flow path 19. The plurality of nozzle blades 21 are arranged at approximately equal intervals on a circumference centered on the axis of rotation H. Each nozzle blade 21 rotates synchronously about an axis NX parallel to the axis of rotation H. The plurality of nozzle blades 21 rotate as described above, thereby widening or narrowing the gap between adjacent nozzle blades 21, thereby adjusting the opening of the nozzle flow path 19.

[0036] To drive the nozzle blades 21 as described above, the turbine 2 includes a variable capacity mechanism 20. The variable capacity mechanism 20 is embedded inside the turbine housing 4. The variable capacity mechanism 20 includes: the aforementioned plurality of nozzle blades 21, and two nozzle rings 23 (second plate component) and 27 (first plate component) that axially clamp the nozzle blades 21. The two nozzle rings 23 and 27 are arranged axially, with the nozzle ring 23 positioned closer to the compressor side than the nozzle ring 27. The nozzle rings 23 and 27 are each annular with respect to the axis of rotation H. The nozzle rings 23 and 27 are configured to circumferentially surround the turbine impeller 2T. The area clamped axially by the two nozzle rings 23 and 27 constitutes the aforementioned nozzle flow path 19. The nozzle rings 23 and 27 are axially connected to each other via a plurality of connecting pins 29. The axial dimensional accuracy of the nozzle flow path 19 is ensured by manufacturing the dimensions of the connecting pins 29 with high precision.

[0037] The variable capacity mechanism 20 has a drive mechanism 25 for driving the nozzle blades 21. The drive mechanism 25 is housed in the space between the nozzle ring 23 and the bearing housing 13. The drive mechanism 25 transmits the driving force from an external actuator to the nozzle blades 21.

[0038] Side reference Figure 2 and Figure 3 The drive mechanism 25 of the variable capacity mechanism 20 will be described in more detail. A bearing hole 31 extending axially is provided in the nozzle ring 23. The rotation shaft 21a of each nozzle blade 21 is rotatably inserted into each bearing hole 31. Furthermore, in Figure 2 and Figure 3 In the example, the nozzle blades 21 are arranged at equal intervals on the circumference, but it is not necessary for the nozzle blades 21 to be arranged at equal intervals.

[0039] The drive mechanism 25 includes a drive ring 33, a nozzle chain link plate 35, and a drive chain link plate 37. The drive ring 33 is annular, extending circumferentially around the rotation axis H. The drive ring 33 is disposed along the compressor side surface of the nozzle ring 23. The drive ring 33 is rotatable relative to the nozzle ring 23 about the rotation axis H. Engaging portions 33a, which engage with each nozzle chain link plate 35, are provided on the drive ring 33 at predetermined intervals along the circumference.

[0040] Nozzle link plates 35 are arranged in the same number as nozzle blades 21. The nozzle link plates 35 are mounted at the ends of the rotation shafts 21a of the nozzle blades 21. The nozzle link plates 35 extend radially outward from the ends of the rotation shafts 21a. More specifically, each rotation shaft 21a of the nozzle blades 21 passes through a bearing hole 31. Each end of the rotation shaft 21a protrudes from the nozzle ring 23 toward the compressor side. The inner circumferential ends of each nozzle link plate 35 are mounted to the protruding ends of the rotation shafts 21a. The outer circumferential ends of each nozzle link plate 35 engage with the engaging portion 33a of the drive ring 33.

[0041] An input-side engaging portion 33b is provided in the drive ring 33. The input-side engaging portion 33b is located between a set of engaging portions 33a. The outer peripheral end of the drive link plate 37 engages with the input-side engaging portion 33b. The inner peripheral end of the drive link plate 37 is connected to the drive shaft of an external actuator.

[0042] If an external actuator rotates the drive link plate 37 about an axis parallel to the rotation axis H via a drive shaft, the outer peripheral end of the drive link plate 37 presses against the input-side engagement portion 33b in the circumferential direction. As a result, the drive ring 33 rotates about the rotation axis H. Consequently, each engagement portion 33a of the drive ring 33 presses against the outer peripheral end of each nozzle link plate 35 in the circumferential direction. Thus, each nozzle link plate 35 rotates about the axis NX, and consequently, each nozzle blade 21 fixed to each nozzle link plate 35 rotates about the axis NX.

[0043] The following is a reference. Figure 3 The method for removing deposits is described in detail below. The drive ring 33 rotates relative to the nozzle ring 23. That is, the drive ring 33 rotates while rubbing against the nozzle ring 23. If dust or other deposits adhere to the area where this friction occurs, it may restrict the rotation of the drive ring 33 relative to the nozzle ring 23. The method for removing deposits is to remove the deposits accumulated at the area where friction occurs.

[0044] Furthermore, the method of removing deposits does not require the complete removal of accumulated deposits. Here, "removal" refers to removing the deposits to the extent that the rotation of the drive ring 33 relative to the nozzle ring 23 is not restricted. That is, even if deposits are present on the drive ring 33 and nozzle ring 23, the deposits can be considered removed as long as the rotation of the drive ring 33 relative to the nozzle ring 23 is not restricted.

[0045] The parts where friction occurs due to the rotation of the drive ring 33 relative to the nozzle ring 23 will be described. The nozzle ring 23 has a flow path forming surface 23a and a nozzle ring support surface 23b. The flow path forming surface 23a is the surface facing the nozzle ring 27 and is provided with a plurality of nozzle blades 21. The nozzle ring support surface 23b is the surface opposite to the flow path forming surface 23a. The nozzle ring support surface 23b faces the bearing housing 13. The nozzle ring support surface 23b is an annular region provided on the outer periphery of the nozzle ring 23.

[0046] The nozzle ring 23 includes a drive ring support portion 231. The drive ring support portion 231 can be part of the nozzle ring 23 or a separate component from the nozzle ring 23. The drive ring support portion 231 is a cylindrical protrusion extending from the nozzle ring support surface 23b. The drive ring support portion 231 includes a supporting main surface 231p and a supporting outer peripheral surface 231s. Multiple bearing holes 31 are formed in the drive ring support portion 231. That is, multiple nozzle link plates 35 and a portion of a drive link plate 37 are disposed in the drive ring support portion 231.

[0047] A circular drive ring 33 is mounted on the nozzle ring support surface 23b. When viewed from above along the rotation axis H, the nozzle ring support surface 23b and the drive ring 33 may have approximately the same planar shape. For example, the outer diameter of the nozzle ring support surface 23b is the same as the outer diameter of the drive ring 33. The drive ring support portion 231 is located inside the drive ring 33. More specifically, the inner circumferential surface 33s of the drive ring is opposite to the outer circumferential surface 231s of the support. The inner diameter of the inner circumferential surface 33s of the drive ring is approximately the same as the outer diameter of the outer circumferential surface 231s of the support. The drive ring 33 is loosely fitted onto the drive ring support portion 231, thereby restricting the movement of the drive ring 33 to rotation about the rotation axis H.

[0048] Thus, during the rotation of the drive ring 33 relative to the nozzle ring 23, the friction occurs primarily between the nozzle ring support surface 23b and the drive ring back surface 33r, and secondarily between the support outer peripheral surface 231s and the drive ring inner peripheral surface 33s. If deposits accumulate between the nozzle ring support surface 23b and the drive ring back surface 33r, the rotation of the drive ring 33 relative to the nozzle ring 23 will be restricted. Similarly, even if deposits accumulate between the support outer peripheral surface 231s and the drive ring inner peripheral surface 33s, the rotation of the drive ring 33 relative to the nozzle ring 23 will still be restricted. Therefore, the variable capacity mechanism 20 in this embodiment is provided with a first removal section 5, a second removal section 6, and a third removal section 7. The first removal section 5, the second removal section 6, and the third removal section 7 are collectively referred to as the removal structure 90.

[0049] <First Removal Section>

[0050] Figure 4 (a) and Figure 4 (b) is a magnified view of the first removal portion 5. The first removal portion 5 is formed on the drive ring 33. In the example of this embodiment, three first removal portions 5 are provided on the drive ring 33. More specifically, the first removal portions 5 are provided on the inner circumferential surface 33s of the drive ring. The number of first removal portions 5 is not limited to three, as long as at least one is provided on the drive ring 33. The number of first removal portions 5 can also be three or more. The first removal portions 5 can be used to scrape off the deposits attached to the outer circumferential surface 231s of the support. Therefore, the position of the first removal portion 5 can be provided at a location on the outer circumferential surface 231s of the support where deposits easily accumulate.

[0051] The first removal portion 5 is a notch provided on the inner circumferential surface 33s of the drive ring. Here, the inner circumferential surface 33s of the drive ring includes a portion that can contact the outer circumferential surface 231s of the support (drive ring inner circumferential contact surface 33s1) and a portion that cannot contact the outer circumferential surface 231s of the support (drive ring removal portion inner circumferential surface 33s2). In the portion that can contact the outer circumferential surface 231s of the support, there is a small gap between it and the outer circumferential surface 231s, but its inner diameter is approximately the same as the outer diameter of the outer circumferential surface 231s of the support. Therefore, when the drive ring 33 rotates, the portion that can contact the outer circumferential surface 231s of the support will rub against the outer circumferential surface 231s of the support. In contrast, the notch, which is the portion that cannot contact the outer circumferential surface 231s of the support, will not contact the outer circumferential surface 231s of the support even when the drive ring 33 rotates. That is, the circumferential surface of the notch is far from the outer circumferential surface 231s of the support.

[0052] exist Figure 4 In the example shown in (a), the planar shape of the first removal portion 5, which serves as the notch, is semi-circular. A portion of the nozzle ring support surface 23b of the nozzle ring 23 protrudes from the first removal portion 5. A removal edge 51 is provided at the ridge (corner) where the inner circumferential contact surface 33s1 (contact inner circumferential surface) of the drive ring connects to the inner circumferential surface 33s2 (notch inner circumferential surface) of the drive ring removal portion. The removal edge 51 is the first removal portion 5 in a narrow sense.

[0053] The removal edge 51 is the ridge line connecting the inner circumferential contact surface 33s1 of the drive ring and the inner circumferential surface 33s2 of the drive ring removal section. Therefore, the radial position of the removal edge 51 is the same as the inner diameter of the inner circumferential contact surface 33s1 of the drive ring. As a result, when deposits adhere to the outer circumferential surface 231s of the support and extend beyond the height of the inner circumferential contact surface 33s1 of the drive ring, the deposits are scraped off by the removal edge 51. The height of the deposit scraped off by the removal edge 51 can vary depending on the position of the outer circumferential surface 231s of the support.

[0054] The shape of the removal edge 51 can be defined as the angle between the inner circumferential contact surface 33s1 of the drive ring and the inner circumferential surface 33s2 of the drive ring removal portion. More specifically, the angle between the inner circumferential contact surface 33s1 of the drive ring and the inner circumferential surface 33s2 of the drive ring removal portion is a so-called acute angle. If the removal edge 51 with this angle presses against the attached material due to the rotation of the drive ring 33, the direction of the force exerted on the attached material by the removal edge 51 is directed away from the supporting outer circumferential surface 231s. Therefore, the attached material can be effectively scraped off.

[0055] <Second Removal Section>

[0056] When the drive ring 33 rotates, the first removal unit 5 can remove the deposits accumulated on the outer peripheral surface 231s of the support within the range of movement of the removal edge 51. Thus, deposits accumulated on the outer peripheral surface 231s of the support outside the range of movement of the removal edge 51 cannot be removed by the first removal unit 5. Therefore, a second removal unit 6 is provided in the area where deposits cannot be removed by the first removal unit 5.

[0057] The second removal part 6 is also disposed on the inner circumferential surface 33s of the drive ring in the same manner as the first removal part 5. More specifically, the second removal part 6 is disposed on the inner circumferential contact surface 33s1 of the drive ring. That is, the second removal part 6 can also be said to be disposed between two adjacent first removal parts 5. The second removal part 6 can be disposed on the entire surface of the inner circumferential contact surface 33s1 of the drive ring. The second removal part 6 can also be disposed on a portion of the inner circumferential contact surface 33s1 of the drive ring. Figure 3 The example illustration shows a case where a second removal part 6 is provided on a portion of the inner circumferential contact surface 33s1 of the drive ring.

[0058] like Figure 5 As shown, the second removal portion 6 is a small uneven structure provided on the inner circumferential contact surface 33s1 of the drive ring. The second removal portion 6 can be defined as a protrusion protruding from the inner circumferential contact surface 33s1 of the drive ring. The second removal portion 6 can also be defined as a groove recessed from the inner circumferential contact surface 33s1 of the drive ring. Using such an uneven structure, it is possible to scrape away the deposits accumulated on the outer circumferential surface 231s of the support. As an example of an uneven structure, a structure with a triangular cross-sectional shape can be cited. The edge forming the vertex of the triangle extends from the main surface 33p of the drive ring toward the back surface 33r of the drive ring. That is, the edge forming the vertex of the triangle extends in the direction of the rotation axis H.

[0059] <Third Removal Section>

[0060] The first removal unit 5 and the second removal unit 6 described above remove the deposits accumulated on the outer peripheral surface 231s of the support. The third removal unit 7 removes the deposits accumulated on the nozzle ring support surface 23b. The third removal unit 7 is provided on the back surface 33r of the drive ring.

[0061] Figure 6 This is a perspective view showing the nozzle ring 23 and drive ring 33 disassembled and viewed from their rear side. Figure 3 Similarly, in Figure 6 The illustrations of other components constituting the variable capacity mechanism 20 are omitted. Figure 7 It is Figure 6 A magnified view of a portion of the 3D image.

[0062] The third removal part 7 is a small uneven structure provided on the back surface 33r of the drive ring, similar to the second removal part 6. The third removal part 7 can be defined as a protrusion protruding from the back surface 33r of the drive ring. It can also be considered as a groove recessed from the back surface 33r of the drive ring. Using this uneven structure, deposits accumulated on the nozzle ring support surface 23b can be scraped away. Like the second removal part 6, an example of the uneven structure is a structure with a triangular cross-sectional shape. The edges forming the vertices of the triangle extend radially. That is, each edge extends towards the rotation axis H.

[0063] <Exhaust Gap>

[0064] The scraped-off material is preferably discharged to the outside. Therefore, a discharge notch 8 can be provided for discharging the scraped-off material. The discharge notch 8 can be provided only on the inner circumferential surface 33s of the drive ring 33. The discharge notch 8 can also be provided only on the outer circumferential surface 231s of the support portion 231 of the drive ring support. The discharge notch 8 can also be provided on both the inner circumferential surface 33s and the outer circumferential surface 231s of the support portion. Figure 3 The example illustrates a structure where the discharge notch 8 is only located on the inner circumferential surface 33s of the drive ring 33.

[0065] The discharge notch 8 is an opening from the main surface 33p of the drive ring to the back surface 33r of the drive ring. Similar to the first removal section 5, the discharge notch 8 does not contact the outer peripheral surface 231s of the support. Therefore, the first removal section 5 also performs the same function as the discharge notch 8. Figure 3 In the example, two discharge notches 8 are provided in the drive ring 33. The number of discharge notches 8 is not limited to two. When discharge notches 8 are provided, there must be at least one discharge notch 8. Discharge notches 8 can also be omitted.

[0066] <Effects>

[0067] The variable capacity mechanism 20 includes: a plurality of nozzle blades 21 forming a plurality of flow paths guiding gas from a vortex flow path to a turbine impeller 2T; nozzle rings 23 and 27, which are separately arranged along the axis NX of the plurality of nozzle blades 21 in a manner that clamps the plurality of nozzle blades 21; and a drive ring 33, which is disposed on a nozzle ring support surface 23b side opposite to the flow path forming surface 23a of the nozzle ring 23 facing the plurality of nozzle blades 21, and is rotatable about the rotation axis H of the turbine impeller 2T while in contact with the nozzle ring 23. At least one of the first portion of the nozzle ring 23 in contact with the drive ring 33 and the second portion of the drive ring 33 in contact with the nozzle ring 23 is provided with a removal structure 90 for removing deposits adhering to the first portion of the nozzle ring 23 and / or the second portion of the drive ring 33.

[0068] The variable capacity mechanism 20 has a removal structure 90 located at least one of a first portion in the nozzle ring 23 that contacts the drive ring 33, and a second portion in the drive ring 33 that contacts the nozzle ring 23. The removal structure 90 can remove deposits adhering to the first portion in the nozzle ring 23 and / or the second portion in the drive ring 33. As a result, the movement of the drive ring 33 relative to the nozzle ring 23 is not hindered by deposits, thus maintaining the function of adjusting the flow path area and flow direction.

[0069] The first part is the support surface of the nozzle ring 23. The second part is the contact surface of the drive ring 33, which contacts the support surface of the nozzle ring 23. With this structure, deposits attached to the support surface of the nozzle ring 23 and the contact surface of the drive ring 33 can be removed.

[0070] The third removal part 7 is a machined surface with unevenness provided on at least one of the nozzle ring support surface 23b and the back surface 33r of the drive ring. According to this structure, the attached material can be scraped off by the machined surface with unevenness provided on at least one of the nozzle ring support surface 23b and the back surface 33r of the drive ring.

[0071] The nozzle ring 23 includes a drive ring support portion 231 protruding from the nozzle ring support surface 23b. The drive ring support portion 231 includes a support outer peripheral surface 231s located inside the drive ring 33 and in contact with the inner peripheral surface 33s of the drive ring 33. The first portion is the support outer peripheral surface 231s of the nozzle ring 23. The second portion is the inner peripheral surface of the drive ring 33. According to the above structure, it is possible to remove deposits attached between the support outer peripheral surface 231s of the nozzle ring 23 and the inner peripheral surface 33s of the drive ring 33.

[0072] The first part is the portion of the outer peripheral surface 231s of the support that faces the inner peripheral surface 33s of the drive ring in a manner that allows it to contact the inner peripheral surface 33s of the drive ring. The second part is the portion of the inner peripheral surface 33s of the drive ring that faces the outer peripheral surface 231s of the support in a manner that allows it to contact the outer peripheral surface 231s of the support. According to the above structure, it is possible to remove deposits from both the portion of the outer peripheral surface 231s of the support that contacts the inner peripheral surface 33s of the drive ring, and the portion of the inner peripheral surface 33s of the drive ring that contacts the outer peripheral surface 231s of the support.

[0073] The second removal section 6 is a textured surface provided at least on one of the portions opposite the inner circumferential surface 33s of the drive ring and the portion opposite the outer circumferential surface 231s of the support. According to this structure, adhering material can be scraped off through the textured surface.

[0074] The discharge notch 8 is a notch provided on the inner circumferential surface 33s of the drive ring 33 and does not contact the outer circumferential surface 231s of the support. With this structure, the attached material can be discharged from the discharge notch 8.

[0075] The inner circumferential surface 33s of the drive ring 33 includes: an inner circumferential contact surface 33s1 that can contact the outer circumferential surface 231s of the support, and an inner circumferential surface 33s2 of the drive ring removal portion that cannot contact the outer circumferential surface 231s of the support. The removal edge 51 of the first removal portion 5 is a ridge portion connecting the inner circumferential contact surface 33s1 and the inner circumferential surface 33s2 of the drive ring removal portion. According to this structure, the attached material can be scraped off.

[0076] <Variation Example>

[0077] The above description illustrates a variable capacity mechanism and a booster equipped with such a mechanism as examples of the present disclosure. However, the variable capacity mechanism and booster equipped with such a mechanism are not limited to the above embodiments, and modifications are permitted without altering the spirit of the claims. The structures of the various embodiments may also be appropriately combined.

[0078] In the example above, the first removal portion 5 is an edge extending along the thickness direction of the drive ring 33. For example, the first removal portion 5 may be a straight removal edge 51A that is inclined relative to the thickness direction of the drive ring 33 (see reference). Figure 8 (a) The edge forming the first removal section 5 is not limited to a straight line, but can also be an arc-shaped removal edge 51B, 51C (see reference). Figure 8 (b) and Figure 8 (c)).

[0079] like Figure 8 As illustrated in (d), the first removal section 5D may include a cut-off edge 52 in addition to the removal edge 51D. With such a first removal section 5D, the attached material can be removed by pushing it apart in the thickness direction of the drive ring 33.

[0080] In the example above, the first removal portion 5 is formed by three arcs when viewed from above. For example, as in Figure 8 As illustrated in (e), the first removal portion 5E can be formed by an arc.

[0081] In the example above, the cross-sectional shape of the second removal section 6 and the third removal section 7 is shown as a triangle (see reference). Figure 9 (a)). The cross-sectional shape of the second removal section 6 and the third removal section 7 may also be adopted. Figure 9 (b) and Figure 9 (c) such a shape. Figure 9 (a) is an example cross-sectional shape in the implementation method. For example... Figure 9 As shown in (b), the cross-sectional shape is roughly triangular, but its top 6t can be rounded. Figure 9As shown in (c), the cross-sectional shape is roughly triangular, but its top 6t can be flattened. According to Figure 9 (b) and Figure 9 The shape shown in (c) can reduce damage to the outer peripheral surface 231s of the support or the nozzle ring support surface 23b even when the second removal part 6 and the third removal part 7 directly rub against the outer peripheral surface 231s of the support or the nozzle ring support surface 23b.

[0082] In the example above, the direction of the second removal portion 6 is along the thickness direction of the drive ring 33. The second removal portion 6 with such a structure can also be described as a ruled pattern. For example, as... Figure 10 (a) and Figure 10 As shown in (b), the directions of the second removal portions 6A and 6B can be inclined relative to the thickness direction of the drive ring 33. By making the directions of the second removal portions 6A and 6B inclined, the direction of the force applied to the adhered material can be directed towards the back surface 33r side or the main surface 33p side of the drive ring by the rotation of the drive ring 33. Figure 10 As shown in (c), the second removal section 6C can be a so-called twill pattern. Such a twill pattern can be formed by a so-called knurling process. Figure 10 (a) Figure 10 (b) and Figure 10 The variation shown in (c) applies not only to the second removal section 6, but also to the third removal section 7.

[0083] In the example above, the deposits are described as accumulating on the outer peripheral surface 231s of the support and the nozzle ring support surface 23b. The deposits can also accumulate on the inner peripheral surface 33s of the drive ring and the back surface 33r of the drive ring. Therefore, the second removal part 6 can be provided on the inner peripheral surface 33s of the drive ring. The third removal part 7 can be provided on the back surface 33r of the drive ring.

[0084] The first removal section 5, the second removal section 6, and the third removal section 7 can be positioned opposite to areas where deposits tend to accumulate. For example, considering the outer peripheral surface 231s of the support and the inner peripheral surface 33s of the drive ring, the second removal section 6 can be provided on the outer peripheral surface 231s of the support at one location and on the inner peripheral surface 33s of the drive ring at other locations. The second removal section 6 can also be provided on both the outer peripheral surface 231s of the support and the inner peripheral surface 33s of the drive ring. Similarly, considering the nozzle ring support surface 23b and the back surface 33r of the drive ring, the third removal section 7 can be provided on the nozzle ring support surface 23b at one location and on the back surface 33r of the drive ring at other locations.

[0085] The variable capacity mechanism 20 does not need to include all of the first removal unit 5, the second removal unit 6, and the third removal unit 7; it only needs to include at least one of them. The variable capacity mechanism 20 may include only the first removal unit 5. The variable capacity mechanism 20 may include only the second removal unit 6. The variable capacity mechanism 20 may include only the third removal unit 7. The variable capacity mechanism 20 may include both the first removal unit 5 and the second removal unit 6. The variable capacity mechanism 20 may include both the first removal unit 5 and the third removal unit 7. The variable capacity mechanism 20 may include both the second removal unit 6 and the third removal unit 7.

[0086] Explanation of reference numerals in the attached figures

[0087] 1...Booster; 2...Turbine; 2T...Turbine impeller; 3...Compressor; 3T...Compressor impeller; 4...Turbine housing (casing); 5...First removal section; 6, 6A, 6B, 6C...Second removal section; 6t...Top; 7...Third removal section; 8...Discharge notch; 12...Compressor housing; 13...Bearing housing; 14...Rotating shaft; 15...Bearing; 16...Vortex flow path; 17...Vortex flow path; 19...Nozzle flow path; 20...Variable capacity mechanism; 21...Nozzle blade; 21a...Rotating shaft; 23...Nozzle ring (second plate component); 23a...Flow path forming surface; 23b...Nozzle ring support surface; 25...Driver Components; 27... Nozzle ring (first plate component); 29... Connecting pin; 31... Bearing hole; 33... Drive ring; 33a... Engaging part; 33b... Input side engaging part; 33p... Drive ring main surface; 33r... Drive ring back side; 33s... Drive ring inner circumferential surface; 33s1... Drive ring inner circumferential contact surface (contact inner circumferential surface); 33s2... Drive ring removal part inner circumferential surface (notch inner circumferential surface); 35... Nozzle link plate; 37... Drive link plate; 51, 51A, 51B, 51C... Removal edge; 52... Cut-off edge; 90... Removal structure; 231... Drive ring support part; 231s... Support outer circumferential surface; H... Rotation axis; NX... Axis.

Claims

1. A variable capacity mechanism, characterized in that, have: Multiple nozzle blades form multiple flow paths that guide the gas from the vortex flow path to the turbine impeller; The first plate component and the second plate component are arranged separately from each other along the axis of the plurality of nozzle blades in such a way that they clamp the plurality of nozzle blades; as well as A drive ring, disposed on the support surface side of the second plate member opposite to the flow path forming surface of the second plate member facing the plurality of nozzle blades, is capable of rotating about the rotation axis of the turbine impeller while in contact with the second plate member. At least one of the first portion of the second plate component that contacts the drive ring and the second portion of the drive ring that contacts the second plate component is provided with a removal part for removing the attachments adhering to the first portion of the second plate component and / or the second portion of the drive ring.

2. The variable capacity mechanism according to claim 1, characterized in that, The first part is the support surface of the second plate component. The second part is the contact surface of the drive ring that contacts the support surface of the second plate component.

3. The variable capacity mechanism according to claim 2, characterized in that, The removal portion is a textured surface that is provided on at least one of the support surface and the contact surface.

4. The variable capacity mechanism according to claim 1, characterized in that, The second plate component includes a drive ring support portion protruding from the support surface. The drive ring support includes a support outer peripheral surface located inside the drive ring and in contact with the inner circumferential surface of the drive ring. The first part is the supporting outer peripheral surface of the second plate component. The second part is the inner circumferential surface of the drive ring.

5. The variable capacity mechanism according to claim 4, characterized in that, The first portion is a part of the outer peripheral surface of the support that faces the inner peripheral surface of the ring in a manner that allows it to contact the inner peripheral surface of the ring. The second part is a portion of the inner circumferential surface of the ring that faces the outer circumferential surface of the support in a manner that allows it to contact the outer circumferential surface of the support.

6. The variable capacity mechanism according to claim 5, characterized in that, The removal portion is a textured surface with concave and convex surfaces provided at least on one of the portion facing the inner circumference of the ring and the portion facing the outer circumference of the support.

7. The variable capacity mechanism according to claim 5, characterized in that, The removal portion is a support notch provided on the inner circumferential surface of the drive ring and not in contact with the outer circumferential surface of the support.

8. The variable capacity mechanism according to claim 5, characterized in that, The removal portion is a support notch provided on the outer peripheral surface of the drive ring support portion and not in contact with the inner peripheral surface of the ring.

9. The variable capacity mechanism according to claim 5, characterized in that, The inner circumferential surface of the drive ring includes: a contact inner circumferential surface that can contact the outer circumferential surface of the support, and a notched inner circumferential surface that cannot contact the outer circumferential surface of the support. The second part is the ridge line where the inner contact surface and the inner notch surface connect.

10. A booster, characterized in that, have: Turbine impeller; A housing, comprising a flow path for gas flow received from an inlet; and A variable capacity mechanism, disposed within the housing, receives the gas from the flow path and guides it to the turbine impeller. The variable capacity mechanism has the following features: Multiple nozzle blades form multiple flow paths that guide the gas from the vortex flow path to the turbine impeller; The first plate component and the second plate component are arranged separately from each other along the axis of the plurality of nozzle blades in such a way that they clamp the plurality of nozzle blades; as well as A drive ring, disposed on the support surface side of the second plate member opposite to the flow path forming surface of the second plate member facing the plurality of nozzle blades, is capable of rotating about the rotation axis of the turbine impeller while in contact with the second plate member. At least one of the first portion of the second plate component that contacts the drive ring and the second portion of the drive ring that contacts the second plate component is provided with a removal part for removing the attachments adhering to the first portion of the second plate component and / or the second portion of the drive ring.

Images