JP2013015102A - Waste gate valve and supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the sealing performance of a waste gate valve 39 while maintaining easiness in assembling the waste gate valve 39.SOLUTION: An annular step part 57 is formed at the edge on the support hole 41 side in a mounting base 47, and the outer peripheral surface of the step part 57 of the mounting base 47 is provided with a seal ring 59 in pressure contact by its resilience. The seal ring 59 is brought into pressure contact with the peripheral edge of the support hole 41 on the inner wall surface of a turbine housing 27 by the pressure of exhaust gas.

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. The general configuration of the waste gate valve is as follows.

  A stem is rotatably supported via a bush in a support hole formed through the turbine housing, and a base end portion of the stem projects to the outside of the turbine housing. An attachment member is integrally provided at the tip of the stem.

  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, in recent years, the pressure of the exhaust gas supplied into the turbine housing tends to increase, and accordingly, the exhaust gas tends to leak from the gap between the inner peripheral surface of the bush and the outer peripheral surface of the stem, and the waste gate. There is an urgent need to improve the sealing performance of valves.

  Accordingly, 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 used in a supercharger in which a bypass passage (bypass hole) for bypassing a gas flowing into the turbine housing to the outlet side of the turbine housing is formed. In the waste gate valve for opening and closing the opening, a stem (supported by a support hole formed through the bypass passage in the turbine housing so as to be rotatable and having a base end (one end) projecting outside the turbine housing ( A valve shaft), a mounting member provided integrally with the stem, a valve body provided integrally with the mounting member and capable of contacting and separating from a peripheral edge of the opening of the bypass passage, and a base of the stem A link member that is integrally provided at the end and swings in the forward / reverse direction around the axis of the stem by driving of the actuator. An annular step portion is formed at an edge of the member on the side of the support hole, and a seal ring is provided in pressure contact with an outer peripheral surface of the step portion of the mounting member by its elastic force (elastic force of the seal ring), The gist of the invention is that the seal ring presses the peripheral edge of the support hole in the inner wall surface of the turbine housing by gas pressure.

  Note that “supported rotatably in the support hole” means that the support hole is supported so as to be indirectly rotatable via a bush, in addition to being directly supported in the support hole. It is meant to include.

  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 seal ring is provided in pressure contact with the outer peripheral surface of the step portion of the mounting member by its elastic force, and the seal ring is formed in the support hole in the inner wall surface of the turbine housing by gas pressure. Since the peripheral edge of the turbine housing is press-contacted, a seal member (including a seal ring other than the seal ring) is not interposed between the inner peripheral surface of the support hole of the turbine housing and the outer peripheral surface of the stem. However, the seal ring can seal between the inner peripheral surface of the support hole of the turbine housing and the outer peripheral surface of the stem.

  Note that “between the inner peripheral surface of the support hole of the turbine housing and the outer peripheral surface of the stem” means that the stem is rotatably supported by the support hole of the turbine housing via a bush. In this case, it is intended to include the space between the inner peripheral surface of the bush and the outer peripheral surface of 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 seal member is not interposed between the inner peripheral surface of the support hole of the turbine housing and the outer peripheral surface of the stem, the inner periphery of the support hole of the turbine housing is formed by the seal ring. Since the gap between the surface and the outer peripheral surface of the stem can be sealed, the inner peripheral surface of the support hole of the turbine housing and the outer peripheral surface of the stem are maintained while maintaining the ease of assembly (assembly) of the waste gate valve. It is possible to sufficiently prevent gas from leaking to the outside of the turbine housing from the gap between the two and the sealing performance of the waste gate valve.

FIG. 1 is a cross-sectional view taken along line II in FIG. FIG. 2 is an enlarged view of the arrow II in FIG. FIG. 3 is a side view of the turbine in the vehicle supercharger according to the embodiment of the present invention. FIG. 4 is a side sectional view of the vehicle supercharger according to the embodiment of the present invention.

  An 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 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 a rotational force (rotational torque) using the pressure energy of the exhaust gas is disposed on the rear side of the bearing housing 3. The specific configuration of the turbine 25 is as follows. Become.

  A turbine housing 27 is provided on the rear 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).

  Inside the turbine housing 27, a bypass passage (bypass hole) 37 for bypassing the exhaust gas that has flowed into the outlet side of the turbine housing 27 is formed. A waste gate valve 39 for opening and closing the opening is provided. And the concrete structure of the waste gate valve 39 which is the principal part of embodiment of this invention is as follows.

  A stem (valve shaft) 43 is directly and rotatably supported in a support hole 41 formed through the turbine housing 27, and a base end portion of the stem 43 protrudes to the outside of the turbine housing 27. . Note that the stem 43 may be indirectly supported rotatably via a bush instead of being directly supported rotatably by the support hole 41 of the turbine housing 27.

  An attachment member 45 is integrally provided on the stem 43 by welding, and the attachment member 45 is located in a region facing the opening of the bypass passage 37. The attachment member 45 includes a cylindrical attachment base 47 that is integrally attached to the stem 43 and an attachment tongue 49 that is integrally provided on the attachment base 47.

  A valve body 51 is integrally provided by caulking on a mounting tongue 49 of the mounting member 45 (the front end portion of the mounting member 45). The valve body 51 is an opening of the bypass passage 37 on the inner wall surface of the turbine housing 27. It is possible to contact and separate from the peripheral edge of the part. Further, the valve body 51 is in contact with the peripheral edge 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) 53 is integrally provided at the base end portion of the stem 43 by welding, and the link plate 53 swings in the forward and reverse directions around the axis of the stem 43 by driving of the actuator 55. It comes to move. Here, the actuator 55 has a known configuration with a built-in diaphragm (not shown), as shown in, for example, Japanese Patent Application Laid-Open Nos. 10-103069, 2008-25442, and the like. When the pressure on the outlet side of the compressor reaches the set pressure, the link plate 53 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 53 is moved in the reverse direction (the other direction). ).

  An annular stepped portion 57 is formed at the edge of the mounting base 47 on the side of the support hole 41, and the seal ring 59 is provided with an elastic force (of the seal ring 59 on the outer peripheral surface of the mounting base 47 stepped portion 57. It is provided in pressure contact with the elastic force. The seal ring 59 is allowed to move in the axial direction (the axial direction of the stem 43) with respect to the stepped portion 57 of the mounting base 47, and the support hole 41 in the inner wall surface of the turbine housing 27 is caused by the pressure of the exhaust gas. The periphery is pressed.

  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.

  During operation of the vehicle supercharger 1, the valve plate 51 is moved in the forward direction by swinging the link plate 53 in the forward direction (one direction) by driving the actuator 55 and rotating the stem 43 in the forward direction. By swinging integrally with the mounting member 45, the mounting member 45 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.

  Further, after opening the opening of the bypass passage 37, the link plate 53 is swung in the reverse direction (the other direction) by driving the actuator 55, and the stem 43 is rotated in the reverse direction, so that the valve body 51 is reversed. It is made to swing integrally with the mounting member 45 in the direction and is brought into contact with the peripheral edge of the opening portion of the bypass passage 37. Thereby, the opening part of the bypass passage 37 can be closed and the waste gate valve 39 can be returned to the original state.

  In addition to the above-described operation, a seal ring 59 is provided in pressure contact with the outer peripheral surface of the stepped portion 57 of the mounting base 47 by its elastic force. Since the peripheral edge of 41 is pressed, a seal member (including a seal ring other than the seal ring 59) is interposed between the inner peripheral surface of the support hole 41 of the turbine housing 27 and the outer peripheral surface of the stem 43. Even if not, the seal ring 59 can seal between the inner peripheral surface of the support hole 41 of the turbine housing 27 and the outer peripheral surface of the stem 43.

  Further, even if the stem 43 is directly rotatably supported by the support hole 41 of the turbine housing 27, as described above, the seal ring 59 and the inner peripheral surface of the support hole 41 of the turbine housing 27 and the stem 43. Since the space between the outer peripheral surface and the outer peripheral surface can be sealed, the bush that rotatably supports the stem 43 can be omitted from the components of the waste gate valve 39.

  Therefore, according to the embodiment of the present invention, the seal ring 59 can support the turbine housing 27 without using a seal member between the inner peripheral surface of the support hole 41 of the turbine housing 27 and the outer peripheral surface of the stem 43. Since the gap between the inner peripheral surface of the hole 41 and the outer peripheral surface of the stem 43 can be sealed, the ease of assembling the waste gate valve 39 is maintained, and the inner peripheral surface of the support hole 41 of the turbine housing 27 is maintained. The exhaust gas can be sufficiently prevented from leaking to the outside of the turbine housing 27 from the gap between the outer surface of the stem 43 and the sealing performance of the waste gate valve 39 can be enhanced.

  Further, since the bush can be omitted from the components of the waste gate valve 39, the number of parts of the waste gate valve 39 can be reduced, and the configuration of the waste gate valve 39 can be simplified.

  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 flow path 35 Gas discharge port 37 Bypass passage 39 Waste gate valve 41 Support Hole 43 Stem 45 Mounting member 47 Mounting base 49 Mounting tongue 51 Valve body 53 Link plate 55 Actuator 57 Step 59 Seal ring

Claims (3)

In a waste gate valve used for a supercharger in which a bypass passage for bypassing the gas flowing into the turbine housing to the outlet side of the turbine housing is formed, and opening and closing the opening of the bypass passage,
A stem rotatably supported in a support hole formed through the turbine housing, and a base end portion protruding to the outside of the turbine housing;
An attachment member provided integrally with the stem;
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;
An annular step portion is formed at an edge of the mounting member on the support hole side, a seal ring is provided in pressure contact with an outer peripheral surface of the step portion of the mounting member by its elastic force, and the seal ring is a gas A wastegate valve, wherein the peripheral edge of the support hole in the inner wall surface of the turbine housing is pressed by pressure.   The wastegate valve according to claim 1, wherein the stem is directly supported rotatably in the support hole of the turbine housing. In the supercharger that supercharges the air supplied to the engine side using the energy of the gas from the engine,
A turbocharger comprising the wastegate valve according to claim 1.

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