JP5842553B2 - Turbocharger - Google Patents

Description

  The present invention relates to a supercharger including an actuator that adjusts a flow rate for bypassing a fluid guided to a turbine impeller according to a pressure of a fluid compressed by a compressor housing.

  Conventionally, a supercharger is used for the purpose of increasing output by connecting to an engine or the like, for example. When the supercharging pressure of this supercharger increases, the flow rate and pressure of the exhaust gas thereafter increase, which increases the rotational power of the supercharger, further increases the supercharging pressure, and damages the engine and supercharger. There is a fear. Therefore, some turbochargers are equipped with an actuator that bypasses a part of the exhaust gas from the engine to the downstream of the turbine and suppresses the pressure of the exhaust gas flowing into the turbine housing.

  More specifically, the turbocharger is provided with a bypass passage that communicates the upstream and downstream of the turbine impeller, and a waste gate valve that opens and closes the bypass passage. An actuator is connected to the waste gate valve, and this actuator operates so that the diaphragm operates when the pressure in the compressor housing exceeds a predetermined pressure, and the waste gate valve opens as the diaphragm operates.

  The actuator, more specifically the diaphragm, is generally vulnerable to heat. For example, in the supercharger disclosed in Patent Document 1, an L-shaped heat insulating member is disposed in the vicinity of the actuator. By doing so, the actuator is prevented from being deteriorated by the radiant heat from the turbine housing that is heated by the exhaust gas of the engine.

JP 2011-127576 A

  However, even if the heat insulating member shown in Patent Document 1 is provided, radiation or convection may occur when radiant heat from a heat source such as a turbine housing or an engine is strong or when an actuator is disposed near the engine or turbine housing. Therefore, heat transfer to the actuator (diaphragm) may not be prevented, and further improvement of the heat insulating effect is desired.

  An object of the present invention is to provide a supercharger that can prevent deterioration of an actuator due to radiant heat from a heat source.

In order to solve the above-described problems, a supercharger according to the present invention is a supercharger connected to an engine, and includes a supercharger main body in which a turbine housing and a compressor housing are integrated, and the supercharger main body. A turbine impeller that is rotatably supported and accommodated in the turbine housing is provided at one end, and a compressor shaft that is accommodated in the compressor housing is provided at the other end, and compressed by the compressor housing An actuator having a diaphragm that operates according to the pressure of the fluid and a casing of the diaphragm, and an actuator that bypasses the fluid that is guided to the turbine impeller in accordance with the operation of the actuator, and the actuator a fixing member for mounting the supercharger main body, against the said engine In the state that the, the disposed between the actuating portion and the engine, and a heat shield which thermally isolates the heat transfer from the engine to the operating unit, the heat shield is along said casing extending Te, disposed opposite Rutotomoni to maintain a gap, a pair of heat insulating portion which is interposed between the fixing member and the casing, the gap of the pair of heat insulating portion, the pair It is characterized by being open to the outside of the heat shield part on the opposite side to the engine .

  Of the pair of heat shield parts, the heat shield part located on the operating part side extends longer in the direction around the axis around the operating direction of the actuating part than the heat shield part located on the engine side. It may be.

  The heat shield member may be located between the operating part and the turbine housing.

  ADVANTAGE OF THE INVENTION According to this invention, deterioration of an actuator by the radiant heat from a heat source can be prevented.

It is explanatory drawing for demonstrating the connection relationship of a supercharger and a supercharger, and an engine. It is an external appearance perspective view of a supercharger. It is an external appearance perspective view of an actuator. It is a front view of an actuator. It is A arrow line view of Fig.4 (a). It is a side view of a supercharger.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram for explaining a supercharger and a connection relationship between the supercharger and the engine, and FIG. 2 is an external perspective view of the supercharger C. Hereinafter, the direction of arrow F shown in FIG. 1 will be described as the front side of the supercharger C, and the direction of arrow R will be described as the rear side of the supercharger C. As shown in FIG. 1, the supercharger C includes a supercharger main body 1. The supercharger body 1 includes a bearing housing 2, a turbine housing 4 connected to the front side of the bearing housing 2 by a fastening bolt 3, a compressor housing 6 connected to the rear side of the bearing housing 2 by a fastening bolt 5, Are formed integrally.

  The bearing housing 2 is formed with a bearing hole 2a penetrating in the front-rear direction of the supercharger C, and the turbine shaft 7 is rotatably supported by the bearing hole 2a via a bearing. A turbine impeller 8 is integrally connected to a front end portion (one end) of the turbine shaft 7, and the turbine impeller 8 is rotatably accommodated in the turbine housing 4. A compressor impeller 9 is integrally connected to the rear end (other end) of the turbine shaft 7, and the compressor impeller 9 is rotatably accommodated in the compressor housing 6.

  The compressor housing 6 is formed with an air inlet 10 that opens to the rear side of the supercharger C and is connected to an air cleaner (not shown). Further, in a state where the bearing housing 2 and the compressor housing 6 are connected by the fastening bolt 5, a diffuser flow path 11 that compresses and pressurizes air is formed by the facing surfaces of both the housings 2 and 6. The diffuser passage 11 is formed in an annular shape from the radially inner side to the outer side of the turbine shaft 7 (compressor impeller 9), and communicates with the intake port 10 via the compressor impeller 9 on the radially inner side. ing.

  Further, the compressor housing 6 is provided with an annular compressor scroll passage 12 positioned on the radially outer side of the turbine shaft 7 (compressor impeller 9) with respect to the diffuser passage 11. The compressor scroll passage 12 communicates with the intake port 13 a of the engine 13 and also communicates with the diffuser passage 11. Therefore, when the compressor impeller 9 rotates, fluid is sucked into the compressor housing 6 from the intake port 10, and the sucked fluid is boosted in the diffuser flow path 11 and the compressor scroll flow path 12 to be sucked into the engine 13. It will be guided to the mouth 13a.

  In order to prevent the pressurized fluid from leaking, the contact surface between the bearing housing 2 and the compressor housing 6 has a recess in the axial direction of the turbine shaft 7 on the bearing housing 2 side, and an O-ring 2b is attached to this recess. ing.

  The turbine housing 4 is formed with a discharge port 14 that opens to the front side of the supercharger C and is connected to an exhaust gas purification device (not shown). Further, in a state where the bearing housing 2 and the turbine housing 4 are connected by the fastening bolt 3, a flow path 15 is formed between the opposing surfaces of both the housings 2 and 4. The flow path 15 is formed in an annular shape from the radially inner side to the outer side of the turbine shaft 7 (turbine impeller 8).

  Further, the turbine housing 4 is provided with an annular turbine scroll passage 16 that is located on the radially outer side of the turbine shaft 7 (turbine impeller 8) than the passage 15. The turbine scroll passage 16 communicates with a gas inlet 16a (shown in FIG. 2) through which exhaust gas discharged from the exhaust port 13b of the engine 13 is guided, and also communicates with the passage 15 described above. Therefore, the exhaust gas led from the gas inlet 16a to the turbine scroll passage 16 is led to the discharge port 14 via the passage 15 and the turbine impeller 8, and the turbine impeller 8 is rotated in the flow process. Become. Then, the rotational force of the turbine impeller 8 is transmitted to the compressor impeller 9 via the turbine shaft 7, and the fluid is boosted by the rotational force of the compressor impeller 9 as described above, so that the intake air of the engine 13 is sucked. It will be guided to the mouth 13a.

  The waste gate valve 17 is provided in a flow path 18 from the gas inlet 16 a to the turbine scroll flow path 16. The flow path 18 is provided with a bypass flow path 19 that bypasses the exhaust gas discharged from the exhaust port 13 b to the downstream side of the turbine impeller 8. When the waste gate valve 17 opens the bypass flow path 19. A part of the exhaust gas is bypassed to the downstream side of the turbine impeller 8 through the bypass passage 19.

  In order to open and close the waste gate valve 17, an actuator 20 is connected to the waste gate valve 17. A connection relationship between the waste gate valve 17 and the actuator 20 will be described.

  As shown in FIGS. 1 and 2, the pipe 21 connected to the compressor scroll flow path 12 in the compressor housing 6 is connected to the operating portion 22 of the actuator 20.

  The operating unit 22 operates according to the pressure of the fluid compressed in the compressor scroll flow path 12. Specifically, the operating part 22 has a cylindrical casing 22c, and an outer shape is formed by the casing 22c. A diaphragm 22a and a spring 22b are arranged inside the casing 22c (shown in FIG. 1), and the diaphragm 22a operates when the force due to the pressure received from the fluid exceeds the elastic force of the spring.

  One end of the rod 23 is connected to the operating portion 22 and the other end is connected to one end of the rotating shaft 25 via the interposition member 24. When the operating portion 22 is operated, the rod 23 moves in the direction of the arrow 22d. Rotate in the direction of arrow 25a. A waste gate valve 17 is connected to the other end of the rotating shaft 25 via an interposition member 26, and the waste gate valve 17 opens as the rotating shaft 25 rotates in the direction of the arrow 25a.

  The flow rate of the exhaust gas bypassed downstream of the turbine impeller 8 is adjusted by changing the opening of the waste gate valve 17 according to the pressure of the fluid compressed in the compressor scroll passage 12. It becomes.

  Thus, the actuator 20 adjusts the flow rate for bypassing the fluid (exhaust gas) guided to the turbine impeller 8 in accordance with the operation of the operation unit 22, and the pressure of the exhaust gas flowing into the turbine scroll passage 16 from the gas inlet 16 a. Is suppressed and the rotation output of the turbine impeller 8 is suppressed.

  FIG. 3 is an external perspective view of the actuator 20, and FIG. 4 is a front view and a partial cross-sectional view of the actuator 20. 4A shows a front view of the actuator 20, and FIG. 4B shows a cross-sectional view taken along line IV (b) -IV (b) of FIG. 4A. However, in FIG.4 (b), illustration is abbreviate | omitted about the internal structure of the action | operation part 22. FIG.

  As shown in FIG. 3, a pressure inlet 27 to which the above-described pipe 21 is connected is provided at one end of the operating portion 22 of the actuator 20, and the actuator 20 is connected to the supercharger main body at the other end of the operating portion 22. The fixing member 28 for installing in 1 is provided.

  As shown in FIG. 4B, the fixing member 28 is fixed to the operating portion 22 by fastening bolts 29 such as screws and nuts. Further, the fixing member 28 is provided with bolt holes 28a and 28b in two projecting portions (see FIG. 3), and is bolted to the supercharger main body 1 by bolts or the like (not shown) through the bolt holes 28a and 28b. The

  A heat shield member 30 is attached to the actuator 20 so as to cover a part of the casing 22c of the operating portion 22. The heat shield member 30 is disposed between the operating unit 22 and the engine 13 in a state where the supercharger C is connected to the engine 13, and shields heat transfer from the engine 13 to the operating unit 22.

  The heat shield member 30 extends along the casing 22 c of the operating unit 22. With this configuration, the heat shield member 30 can more reliably suppress heat transfer to the diaphragm 22a of the operating unit 22.

  Further, as shown in FIG. 4B, the heat shield member 30 includes a pair of heat shield portions 31 a and 31 b and is sandwiched between the other end of the operating portion 22 and the fixing member 28.

  FIG. 5 is a view taken in the direction of arrow A in FIG. As shown in the partially enlarged view of FIG. 5B, the heat shields 31a and 31b are arranged to face each other while maintaining the gap 30a.

  In the supercharger C of the present embodiment, the pair of heat shield portions 31 a and 31 b reduce the heat transfer of radiant heat from the engine 13 to the actuator 20. As described above, since the pair of heat shield portions 31a and 31b are arranged while maintaining the gap 30a, the heat shield member 30 has a heat insulating effect enhanced by the air in the gap 30a. Thus, deterioration of the actuator 20 due to heat can be reduced.

  The gap 30a between the pair of heat shields 31a and 31b is not a space sealed by the pair of heat shields 31a and 31b, but is configured to be open to the outside. With this configuration, an air flow is generated in the gap 30a between the pair of heat shields 31a and 31b. Therefore, the heat shields 31a and 31b can be cooled by the air, and the temperature rise of the heat shields 31a and 31b can be suppressed. . Therefore, heat transfer from the heat source to the actuator 20 can be further reduced.

  Moreover, as shown in FIG.5 (b), among the pair of heat shield parts 31a and 31b, the heat shield part 31a located on the working part 22 side is more active than the heat shield part 31b located on the engine 13 side. It extends long in the direction around the axis (indicated by a double-pointed arrow 33 in the figure) with the operation direction of 22 as an axis.

  Radiant heat from the engine 13 to the operating unit 22 is generated by electromagnetic waves emitted from the engine 13 to the operating unit 22. FIG. 5A schematically shows this electromagnetic wave with an arrow. When the operation part 22 has a curved surface as in the present embodiment, the center side (indicated by an elliptical line 35 in the figure) facing the engine 13 rather than the side surface side (indicated by a broken line circle 34 in the figure) of the action part 22. The higher the density of electromagnetic waves, the higher the temperature.

  Therefore, by making the heat shield portion 31a on the side of the operating portion 22 longer, it is possible to reduce the occupied volume of the heat shield member 30 by making the central side that becomes high temperature a double structure, while making the side surface side one. Become. Therefore, the supercharger C makes it difficult for the heat shield member 30 to interfere with other members of the supercharger C, and can reduce the weight. In this embodiment, in FIG. 5 (a), the heat shield 31a is longer than the heat shield 31b only on the left side of the actuating part 22, but the right side of the actuating part 22 is similarly the heat shield 31a. May be longer than the heat shield 31b.

  FIG. 6 is a side view of the supercharger C. FIG. In FIG. 6, the engine 13 is located on the lower side in the figure toward the gas inlet 16a. Here, in the opening portion of the gap 30a between the pair of heat shield portions 31a and 31b, which is indicated by a broken line circle 36 in FIG. 6, the opening direction is opposite to the direction toward the engine 13 (the direction of the arrow 37 in the figure). (Direction of arrow 38 in the figure).

  Here, the direction opposite to the direction toward the engine 13 does not necessarily have to be exactly opposite to the direction toward the engine 13, and may be a direction that forms an angle of less than 90 degrees with respect to the direction toward the engine 13. That's fine.

  The air on the engine 13 side as viewed from the operating portion 22 of the actuator 20 is heated by the engine 13 and has a high temperature. Therefore, by setting the opening direction of the gap 30a opposite to the engine 13, it is possible to take in low-temperature air into the gap 30a and increase the cooling efficiency of the heat shield portions 31a and 31b.

  In addition, the heat shield member 30 of the present embodiment is located between the operation unit 22 and the turbine housing 4. More specifically, the heat shield member 30 is located between the operating portion 22 and particularly the gas inlet 16 a of the turbine housing 4.

  The vicinity of the gas inlet 16 a of the turbine housing 4 is heated by the exhaust gas discharged from the engine 13 and is at a high temperature. Therefore, with the configuration in which the heat shield member 30 is located between the operating unit 22 and the turbine housing 4, the heat shield member 30 can prevent radiant heat from the turbine housing 4 in addition to radiant heat from the engine 13.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  INDUSTRIAL APPLICABILITY The present invention can be used for a supercharger that adjusts a flow rate that bypasses a fluid guided to a turbine impeller in accordance with a pressure of a fluid compressed by a compressor housing.

C: Supercharger 1 ... Supercharger body 4 ... Turbine housing 6 ... Compressor housing 7 ... Turbine shaft 8 ... Turbine impeller 9 ... Compressor impeller 20 ... Actuator 22 ... Actuator 22a ... Diaphragm 22c ... Casing 30 ... Heat shield member 30a ... Gap 31 ... Heat shield

Claims (3)

A turbocharger connected to the engine,
A turbocharger body in which a turbine housing and a compressor housing are integrated;
A turbine shaft that is rotatably supported by the turbocharger main body, a turbine impeller that is accommodated in the turbine housing is provided at one end, and a compressor impeller that is accommodated in the compressor housing is provided at the other end; ,
An actuator that has a diaphragm that operates in accordance with the pressure of the fluid compressed by the compressor housing and a casing of the diaphragm, and that bypasses the fluid that is guided to the turbine impeller when the actuator is operated When,
A fixing member for installing the actuator in the supercharger body;
A heat shield member disposed between the operating portion and the engine in a state of being connected to the engine, and configured to shield heat transfer from the engine to the operating portion;
The heat shield member is
Extending along said casing, is disposed opposite to maintain a gap Rutotomoni, a pair of heat insulating portion which is interposed between the fixing member and the casing,
The supercharger is characterized in that a gap between the pair of heat shields is opened to the outside of the pair of heat shields on the side opposite to the engine . Of the pair of heat shields, the heat shield located on the working part side extends longer than the heat shield located on the engine side in the direction around the axis with the working direction of the working part as an axis. The supercharger according to claim 1 . The heat shield is supercharger according to claim 1 or 2, characterized in that located between the turbine housing and the actuating portion.

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