JP2013015103A - Waste gate valve and supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fully prevent the occurrence of malfunction of a waste gate valve 43 while fully restraining a leakage of exhaust gas from a clearance between the inner peripheral surface of a first support hole 59 of a storage wall 39 and the outer peripheral surface of a stem 45.SOLUTION: The base end side of the stem 45 is directly supported in a rotatable manner to the first support hole 59 formed penetrating the storage wall 39, and the tip part of the stem 45 is rotatably supported to a second support hole 61 formed in a part, facing the first support hole 59, in the inner wall surface of a turbine housing 27.

Description

  The present invention relates to a waste gate valve that opens and closes a bypass passage for bypassing gas flowing into a turbine housing in a supercharger such as a supercharger for a vehicle to the outlet side of the turbine housing.

  In order to suppress an excessive increase in air supercharging pressure (compressed air pressure) caused by a vehicle supercharger (an example of a supercharger), it normally flows into the turbine housing of the vehicle supercharger. A bypass passage (bypass hole) for bypassing the exhaust gas to the outlet side of the turbine housing is formed, and a waste gate valve for opening and closing the opening of the bypass passage is provided at an appropriate position of the turbine housing. Here, on the radially outer side of the gas discharge port in the turbine housing, a housing wall is formed to protrude outward, and this housing wall has a housing chamber that can communicate with the bypass passage inside. . The general configuration of the waste gate valve is as follows.

  A stem is rotatably supported through a bush in a support hole formed so as to penetrate the housing wall, and a proximal end portion of the stem projects to the outside of the turbine housing. Further, an attachment member is integrally provided at the distal end portion of the stem, and this attachment member is located in the storage chamber.

  A valve body that can be brought into contact with and separated from the periphery of the opening of the bypass passage is integrally provided at the distal end portion of the mounting member, and this valve body is provided with the pressure of the compressor (compressor impeller of the vehicle supercharger). Until the outlet pressure reaches the set pressure, it is in contact with the periphery of the opening of the bypass passage. Further, a link member is integrally provided at the proximal end portion of the stem, and this link member swings in the forward and reverse directions around the axis of the stem by driving of the actuator.

  Therefore, when the compressor pressure reaches the set pressure during operation of the vehicle supercharger, the actuator is driven to swing the link member in the forward direction (one direction) and rotate the stem in the forward direction. Then, the valve body is rocked integrally with the mounting member in the forward direction to be separated from the peripheral edge of the opening portion of the bypass passage. Thereby, the opening part of a bypass channel | path can be opened, and the exhaust gas which flowed in in the turbine housing can be bypassed via the bypass channel | path to the exit side of a turbine housing.

  Further, when the compressor pressure is less than the set pressure, the actuator is driven to swing the link member in the reverse direction (the other direction) and rotate the stem in the reverse direction to move the valve body in the reverse direction. It is swung integrally and brought into contact with the peripheral edge of the opening of the bypass passage. Thereby, the opening part of a bypass channel can be closed and a waste gate valve can be returned to the original state.

  In addition, there exist some which are shown to patent document 1 and patent document 2 as a prior art relevant to this invention.

JP 2009-236088 A JP 2008-101589 A

  By the way, during the operation of the vehicular supercharger, the frequency (number of times) of opening and closing the bypass passage is usually high, and when the accumulated use time of the vehicular supercharger becomes longer, the interval between the bush and the stem increases accordingly. There is a tendency for the wear of the sliding part to increase. For this reason, exhaust gas tends to leak to the outside of the turbine housing from the gap between the inner peripheral surface of the bush and the outer peripheral surface of the stem, and there is a risk of causing a malfunction of the waste gate valve.

  Therefore, an object of the present invention is to provide a waste gate valve having a novel configuration that can solve the above-described problems.

  A first feature of the present invention is that a bypass passage (bypass hole) for bypassing the gas flowing into the turbine housing to the outlet side of the turbine housing is formed, and the gas exhaust port in the turbine housing is radially outside. A waste gate valve for opening and closing the opening of the bypass passage, wherein the storage wall is formed to protrude outwardly, and the storage wall is used in a supercharger having a storage chamber capable of communicating with the bypass passage. The turbine housing is rotatably provided, a part (intermediate portion) is located in the storage chamber, and a base end portion (one end portion) projects outside the storage wall (outside the turbine housing). A stem (valve shaft), a mounting member provided integrally with a portion of the stem located in the storage chamber, and a single unit with the mounting member And a valve body that can be brought into contact with and separated from the periphery of the opening of the bypass passage, and a base end portion of the stem, and swings in the forward and reverse directions around the axis of the stem by driving an actuator. And a proximal end portion (near the proximal end portion) of the stem is rotatably supported by a first support hole formed through the housing wall, and a distal end portion of the stem. Is summarized in that it is rotatably supported by a second support hole formed at a location facing the first support hole in the inner wall surface of the turbine housing (including the inner wall surface of the housing wall).

  Note that “supported rotatably in the first support hole” means that the first support hole can be rotated indirectly via a bush in addition to being directly supported by the first support hole. It is meant to include being supported by. Similarly, “supported rotatably in the second support hole” means that the second support hole rotates indirectly via a bush, in addition to being directly supported by the second support hole. It is meant to include support as possible.

  According to the first feature of the present invention, the valve member is moved in the forward direction by swinging the link member in the forward direction (one direction) by driving the actuator and rotating the stem in the forward direction. It is made to swing integrally with the mounting member so as to be separated from the peripheral edge of the opening of the bypass passage. Thereby, the opening part of the said bypass channel can be opened, and the gas which flowed in in the said turbine housing can be bypassed via the said bypass channel to the exit side of the said turbine housing.

  Further, after opening the opening of the bypass passage, the valve member is reversed by swinging the link member in the reverse direction (the other direction) by driving the actuator and rotating the stem in the reverse direction. It is made to swing integrally with the mounting member in the direction and is brought into contact with the peripheral edge of the opening portion of the bypass passage. Thereby, the opening part of the bypass passage can be closed, and the waste gate valve can be returned to the original state.

  In addition to the above-described operation, the proximal end side of the stem is rotatably supported by the first support hole of the receiving wall, and the distal end portion of the stem is rotatably supported by the second support hole of the turbine housing. Therefore, the stem is supported at both ends with respect to the turbine housing, and the rotational operation of the stem can be stabilized. Thereby, even if the cumulative usage time of the supercharger becomes long, the wear of the sliding portion between the first support hole of the storage wall and the stem, and the second support hole of the turbine housing Wear of the sliding part between the stems can be reduced.

  The “sliding portion between the first support hole of the storage wall and the stem” means that the proximal end side of the stem rotates indirectly through the bush to the first support hole of the storage wall. When supported, it is intended to include a sliding portion between the bush and the stem. Similarly, “between the second support hole of the turbine housing and the stem” means that the tip end portion of the stem is rotatably supported by the second support hole of the turbine housing via a bush. If included, it is intended to include a sliding portion between the bush and the stem.

  According to a second aspect of the present invention, in the supercharger that supercharges the air supplied to the engine side using the energy of the exhaust gas from the engine, the wastegate valve according to the first feature is provided. This is the gist.

  According to the 2nd characteristic, there exists an effect | action similar to the effect | action by a 1st characteristic.

  According to the present invention, even if the cumulative usage time of the supercharger becomes long, the wear of the sliding portion between the first support hole of the receiving wall and the stem, and the second of the turbine housing Since the wear of the sliding portion between the support hole and the stem can be reduced, the clearance between the inner peripheral surface of the first support hole and the outer peripheral surface of the stem of the receiving wall is extended to the outside of the turbine housing. It is possible to sufficiently prevent the gas from leaking and to sufficiently prevent the malfunction of the waste gate valve.

  The “gap between the inner peripheral surface of the first support hole of the storage wall and the outer peripheral surface of the stem” means that the proximal end side of the stem is inserted into the first support hole of the storage wall via a bush. In this case, the clearance between the inner peripheral surface of the bush and the outer peripheral surface of the stem is included.

FIG. 1 is a cross-sectional view taken along line II in FIG. FIG. 2 is a side view of a turbine in the supercharger for a vehicle according to the embodiment of the present invention. FIG. 3 is a side sectional view of the vehicle supercharger according to the embodiment of the present invention. FIG. 4 is a view for explaining a waste gate valve according to another embodiment of the present invention, which corresponds to FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG.

(Embodiment)
An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the drawings, “F” indicates the forward direction, and “R” indicates the backward direction.

  As shown in FIG. 3, the vehicle supercharger 1 according to the embodiment of the present invention uses the energy of exhaust gas (an example of gas) from an engine (not shown) to supply air supplied to the engine. It is supercharged (compressed). And the specific structure of the supercharger 1 for vehicles is as follows.

  The vehicle supercharger 1 includes a bearing housing 3, and a pair of radial bearings 5 and a pair of thrust bearings 7 are provided in the bearing housing 3. Further, the plurality of bearings 5 and 7 are provided with a rotor shaft (turbine shaft) 9 extending in the front-rear direction so as to be rotatable. In other words, the rotor shaft 9 is provided in the bearing housing 3 with the plurality of bearings 5. , 7 are rotatably provided.

  A compressor 11 that compresses air using centrifugal force is disposed on the rear side of the bearing housing 3, and the specific configuration of the compressor 11 is as follows.

  A compressor housing 13 is provided on the rear side of the bearing housing 3. A compressor impeller 15 is rotatably provided in the compressor housing 13, and the compressor impeller 15 is concentrically and integrally connected to the rear end portion (one end portion) of the rotor shaft 9.

  An air intake port 17 for taking in air is formed on the inlet side of the compressor impeller 15 in the compressor housing 13 (the rear side of the compressor housing 13). The air intake port 17 is an air cleaner (not shown) for purifying air. (Omitted) can be connected. In addition, an annular diffuser passage 19 for increasing the pressure of the compressed air is formed on the outlet side of the compressor impeller 15 between the bearing housing 3 and the compressor housing 13. Further, a spiral compressor scroll passage 21 is formed inside the compressor housing 13 so as to surround the compressor impeller 15, and the compressor scroll passage 21 communicates with the diffuser passage 19. An air discharge port 23 for discharging compressed air is formed at an appropriate position on the outer wall of the compressor housing 13, and this air discharge port 23 communicates with the compressor scroll passage 21, and Can be connected to an air supply manifold (not shown).

  A turbine 25 that generates rotational force (rotational torque) using the pressure energy of the exhaust gas is disposed on the front side of the bearing housing 3, and the specific configuration of the turbine 25 is as follows. .

  A turbine housing 27 is provided on the front side of the bearing housing 3. A turbine impeller 29 is rotatably provided in the turbine housing 27, and the turbine impeller 29 is concentrically and integrally connected to the front end portion (the other end portion) of the rotor shaft 9.

  A gas intake 31 for taking in exhaust gas is formed at an appropriate position on the outer wall of the turbine housing 27, and this gas intake 31 can be connected to an exhaust manifold (not shown) of the engine. Further, a spiral turbine scroll passage 33 is formed on the inlet side of the turbine impeller 29 inside the turbine housing 27, and the turbine scroll passage 33 communicates with the gas inlet 31. Further, a gas discharge port 35 for discharging exhaust gas is formed on the outlet side of the turbine impeller 29 in the turbine housing 27 (the front side of the turbine housing 27). This gas discharge port 35 is formed in the turbine scroll flow path 33. It communicates and can be connected to an exhaust gas purification device (not shown) via a connecting pipe (not shown).

  As shown in FIGS. 1 and 2, a bypass passage (bypass hole) 37 for bypassing the inflowing exhaust gas to the outlet side of the turbine housing 27 is formed inside the turbine housing 27. A housing wall 39 is formed on the radially outer side of the gas discharge port 35 in the turbine housing 27 so as to protrude outward. The housing wall 39 can be communicated with the bypass passage 37 inside. have. A waste gate valve 43 that opens and closes the opening of the bypass passage 37 is provided at an appropriate position of the turbine housing 27. A specific configuration of the waste gate valve 43 that is a main part of the embodiment of the present invention is as follows. It becomes as follows.

  In the turbine housing 27, a stem (valve shaft) 45 is rotatably provided. A part (intermediate part) of the stem 45 is located in the accommodation chamber 41, and a base end part (one end part) of the stem 45 protrudes outside the accommodation wall 39 (outside the turbine housing 27). .

  A mounting member 47 is integrally provided by welding on a portion of the stem 45 positioned in the storage chamber 41 (an intermediate portion of the stem 45). The attachment member 47 includes a cylindrical attachment base portion 49 that is integrally attached to the stem 45, and an attachment tongue portion 51 that is provided integrally with the attachment base portion 49.

  A valve body 53 is integrally provided by caulking on the mounting tongue 51 of the mounting member 47 (the front end portion of the mounting member 47). The valve body 53 is connected to the bypass passage 37 on the inner wall surface of the turbine housing 27. It can be contacted and separated from the periphery of the opening. Further, the valve body 53 is in contact with the periphery of the opening of the bypass passage 37 until the pressure on the outlet side of the compressor impeller 15 reaches the set pressure.

  A link plate (link member) 55 is integrally provided at the base end portion of the stem 45 by welding, and the link plate 55 swings forward and backward around the axis of the stem 45 by driving of the actuator 57. It comes to move. Here, the actuator 57 has a known configuration with a built-in diaphragm (not shown), as shown in, for example, Japanese Patent Application Laid-Open Nos. 10-103069 and 2008-25442, and the compressor impeller 15. When the pressure on the outlet side of the compressor reaches the set pressure, the link plate 55 is swung in the forward direction (one direction), and when the pressure on the outlet side of the compressor impeller 15 becomes less than the set pressure, the link plate 55 is moved in the reverse direction (the other direction). ).

  The proximal end portion side (near the proximal end portion) of the stem 45 is directly supported rotatably in a first support hole 59 formed through the accommodation wall 39. Note that the base end side of the stem 45 may be indirectly supported rotatably via a bush, instead of being directly supported rotatably by the first support hole 59 of the accommodation wall 39.

  The distal end portion of the stem 45 is rotatably supported by a second support hole 61 formed at a location facing the first support hole 59 on the inner wall surface of the turbine housing 27. In addition, instead of being provided directly in the second support hole 61 of the turbine housing 27 so as to be rotatable, the tip portion of the stem 45 may be provided indirectly through a bush.

  Then, the effect | action and effect of embodiment of this invention are demonstrated.

  By causing the exhaust gas taken in from the gas intake port 31 to flow from the inlet side to the outlet side of the turbine impeller 29 via the turbine scroll flow path 33, the rotational energy (rotational torque) is generated using the pressure energy of the exhaust gas. Thus, the rotor shaft 9 and the compressor impeller 15 can be rotated integrally with the turbine impeller 29. Thereby, the air taken in from the air intake port 17 can be compressed and discharged from the air discharge port 23 via the diffuser flow path 19 and the compressor scroll flow path 21, and the air supplied to the engine is supercharged. can do.

  While the vehicle supercharger 1 is in operation, the valve plate 53 is moved in the forward direction by swinging the link plate 55 in the forward direction (one direction) by driving the actuator 57 and rotating the stem 45 in the forward direction. By swinging integrally with the mounting member 47, the mounting member 47 is separated from the periphery of the opening of the bypass passage 37. Thereby, the opening of the bypass passage 37 can be opened, and the exhaust gas flowing into the turbine housing 27 can be bypassed to the outlet side of the turbine housing 27 via the bypass passage 37.

  After opening the opening of the bypass passage 37, the valve plate 53 is reversed by rotating the stem 45 in the reverse direction by swinging the link plate 55 in the reverse direction (other direction) by driving the actuator 57. It is made to swing integrally with the mounting member 47 in the direction and is brought into contact with the peripheral edge of the opening of the bypass passage 37. Thereby, the opening part of the bypass passage 37 can be closed and the waste gate valve 43 can be returned to the original state.

  In addition to the above-described operation, the proximal end portion side of the stem 45 is rotatably supported by the first support hole 59 of the receiving wall 39, and the distal end portion of the stem 45 is rotatably supported by the second support hole 61 of the turbine housing 27. Therefore, the stem 45 is supported at both ends with respect to the turbine housing 27, and the rotation operation of the stem 45 can be stabilized. Thereby, even if the cumulative use time of the supercharger 1 for the vehicle becomes long, the wear of the sliding portion between the first support hole 59 of the accommodation wall 39 and the stem 45, and the second support hole of the turbine housing 27 The wear of the sliding portion between 61 and the stem 45 can be reduced.

  Further, the base end portion side of the stem 45 is supported so as to be directly rotatable in the first support hole 59 of the accommodation wall 39, and the distal end portion of the stem 45 is directly rotatable in the second support hole 61 of the turbine housing 27. Even if it is supported, the rotation operation of the stem 45 can be stabilized as described above. Therefore, the bush that rotatably supports the proximal end portion and the distal end portion of the stem 45 is formed from the components of the waste gate valve 43. Can be omitted.

  Therefore, according to the embodiment of the present invention, even if the cumulative usage time of the vehicle supercharger 1 is increased, the wear of the sliding portion between the first support hole 59 of the accommodation wall 39 and the stem 45, and Since the wear of the sliding portion between the second support hole 61 of the turbine housing 27 and the stem 45 can be reduced, the clearance between the inner peripheral surface of the first support hole 59 of the accommodation wall 39 and the outer peripheral surface of the stem 45 is reduced. It is possible to sufficiently suppress the exhaust gas from leaking out of the turbine housing 27 to the outside of the turbine housing 27 and to sufficiently prevent the malfunction of the waste gate valve 43.

  Further, since the bush can be omitted from the components of the waste gate valve 43, the number of parts of the waste gate valve 43 can be reduced, and the configuration of the waste gate valve 43 can be simplified.

(Another embodiment)
Another embodiment of the present invention will be described with reference to FIGS. In the drawings, “F” indicates the forward direction, and “R” indicates the backward direction.

  As shown in FIGS. 4 and 5, a waste gate valve 63 according to another embodiment of the present invention opens and closes the opening of the bypass passage 37, and the waste gate valve 43 according to the embodiment of the present invention. It has the same composition as. Hereinafter, only a portion of the configuration of the waste gate valve 63 that is different from the configuration of the waste gate valve 43 will be briefly described.

  The base end portion side of the stem 45 is rotatably supported by a first support hole 65 formed through the distal end side of the housing wall 39. Note that the proximal end side of the stem 45 may be indirectly supported rotatably via a bush instead of being directly supported rotatably by the first support hole 65 of the accommodation wall 39.

  The distal end portion of the stem 45 is rotatably supported by a second support hole 67 formed at a location facing the first support hole 65 on the inner wall surface on the distal end side of the accommodation wall 39. In addition, instead of being directly supported by the second support hole 67 of the turbine housing 27 so that the distal end portion of the stem 45 can be rotated, it may be supported indirectly via a bush.

  According to another embodiment of the present invention, the proximal end portion side of the stem 45 is directly rotatably supported by the first support hole 65 on the distal end side of the accommodation wall 39, and the distal end portion of the stem 45 is the accommodation wall. 39 is rotatably supported by the second support hole 67 on the distal end side of 39, so that the proximal end side and the distal end portion of the stem 45 are sufficiently separated from the gas discharge port 35, and the proximal end side of the stem 45 and High temperature at the tip can be suppressed. As a result, the adhesive wear of the sliding portion between the first support hole 65 on the distal end side of the accommodation wall 39 and the stem 45, and between the second support hole 61 on the distal end side of the accommodation wall 39 and the stem 45 are performed. Adhesive wear of the sliding portion can be sufficiently reduced, and the effect of the above-described embodiment of the present invention can be further enhanced.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect by making an appropriate change. Further, the scope of rights encompassed by the present invention is not limited to these embodiments.

DESCRIPTION OF SYMBOLS 1 Vehicle supercharger 3 Bearing housing 9 Rotor shaft 11 Compressor 13 Compressor housing 15 Compressor impeller 25 Turbine 27 Turbine housing 29 Turbine impeller 31 Gas inlet 33 Turbine scroll channel 35 Gas outlet 37 Bypass passage 39 Housing wall 41 Housing chamber 43 Wastegate valve 45 Stem 47 Mounting member 53 Valve body 55 Link plate 57 Actuator 59 First support hole 61 Second support hole 63 Wastegate valve 65 First support hole 67 Second support hole

Claims (4)

A bypass passage for bypassing the gas that has flowed into the turbine housing to the outlet side of the turbine housing is formed, and a housing wall is formed to protrude outward in the radial direction of the gas discharge port in the turbine housing, Used for a supercharger having a storage chamber in which a storage wall can communicate with the bypass passage.
In the waste gate valve that opens and closes the opening of the bypass passage,
A stem rotatably provided in the turbine housing, a part of which is located in the storage chamber, and a base end portion protruding to the outside of the storage wall;
A mounting member provided integrally with a portion of the stem located in the storage chamber;
A valve body provided integrally with the mounting member and capable of coming into contact with and separating from the periphery of the opening of the bypass passage;
A link member that is integrally provided at the proximal end of the stem and swings in the forward and reverse directions around the axis of the stem when driven by an actuator;
The base end portion side of the stem is rotatably supported by a first support hole formed through the housing wall, and the distal end portion of the stem faces the first support hole in the inner wall surface of the turbine housing. A wastegate valve, wherein the wastegate valve is rotatably supported by a second support hole formed at a location to be operated.   The proximal end portion side of the stem is rotatably supported by the first support hole formed so as to penetrate the distal end side of the housing wall, and the distal end portion of the stem is located on the inner wall surface on the distal end side of the housing wall. The wastegate valve according to claim 1, wherein the wastegate valve is rotatably supported by the second support hole formed at a position facing the first support hole.   The base end side of the stem is rotatably supported by the first support hole of the receiving wall, and the distal end of the stem is directly rotatable by the second support hole of the turbine housing. The wastegate valve according to claim 1 or 2, wherein the wastegate valve is supported by the valve. In the supercharger that supercharges the air supplied to the engine side using the energy of the gas from the engine,
A supercharger comprising the wastegate valve according to any one of claims 1 to 3.

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