JP6687292B2 - Actuator for turbocharger - Google Patents

Description

  The present invention relates to a turbocharger actuator.

  In the actuator according to Patent Document 1, a motor that drives a shaft is covered with a resin housing. A flange portion is formed on this housing, and the flange portion is screwed to the compressor housing of the turbocharger.

International Publication No. 2016/135825

  Since the conventional actuator is configured as described above, the resin flange portion comes into contact with the compressor housing of the turbocharger. Since the actuator self-heats during driving, the temperature inside the actuator becomes high. Further, since the turbocharger becomes hot due to the heat of exhaust gas, the flange portion of the actuator receives the heat of the turbocharger and becomes hot. As a result, the components such as the actuator housing, which are made of a resin weak against heat, may be melted and damaged. As described above, the conventional actuator has a problem of low heat resistance.

  The present invention has been made to solve the above problems, and an object thereof is to improve the heat resistance of a turbocharger actuator.

  The turbocharger actuator according to the present invention includes a motor for moving the shaft in the axial direction thereof, the motor being covered with a resin housing, a resin flange portion formed on the housing, and a shaft penetrating the shaft, and the inside of the shaft is A bush that moves in the axial direction, a metal boss that is located on the outer circumference of the bush and that supports the bush, and a metal flange that is formed on the metal boss and that is fastened together with the resin flange portion to the mounting portion of the turbocharger and contacts the mounting portion. And a section.

  According to the present invention, the metal flange portion and the resin flange portion are fastened together with the mounting portion of the turbocharger so that the metal flange portion contacts the mounting portion. Therefore, heat generated by the motor and heat generated by the turbocharger are prevented. Heat can be dissipated from the metal flange to the mounting part. Therefore, the temperature rise of the actuator can be suppressed, and the heat resistance of the actuator is improved.

It is an appearance perspective view showing the example of composition of the actuator concerning Embodiment 1 of this invention. It is a sectional view showing an example of composition of an actuator concerning Embodiment 1 of this invention. It is an exploded perspective view showing an example of composition of an actuator concerning Embodiment 1 of this invention. It is a figure which illustrates the state which attached the actuator which concerns on Embodiment 1 of this invention to a turbocharger. It is sectional drawing which cut | disconnected the actuator which concerns on Embodiment 1 of this invention by the AA line of FIG. It is sectional drawing which shows the structural example of the metal boss in the actuator which concerns on Embodiment 2 of this invention. FIG. 6 is a plan view showing a configuration example of a motor housing and a metal boss in the actuator according to the second embodiment of the present invention.

Hereinafter, in order to describe the present invention in more detail, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1.
FIG. 1 is an external perspective view showing a configuration example of an actuator 1 according to Embodiment 1 of the present invention. FIG. 2 is a sectional view showing a configuration example of the actuator 1 according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view showing a configuration example of the actuator 1 according to the first embodiment of the present invention. The actuator 1 according to the first embodiment reciprocates the shaft 2 in its axial direction. In the following, the actuator 1 is used for opening and closing the wastegate valve of the turbocharger. The actuator 1 is attached to the attachment portion 102 of the turbocharger with the screw 26.

  The motor 3 generates a driving force that reciprocates the shaft 2 in its axial direction. The motor 3 is a brushed motor including a commutator 7, a brush 8, a rotor 9, a coil 10, a magnet 11 and a yoke 12. Two bearings 5a and 5b are installed inside the motor 3, and the bearings 5a and 5b rotatably support the pipe 6. A commutator 7, a rotor 9 and a coil 10 are fixed to the outer peripheral surface of the pipe 6. A brush 8 is installed on the outer peripheral side of the commutator 7. A magnet 11 and a yoke 12 are installed on the outer peripheral sides of the rotor 9 and the coil 10. The motor 3 is not limited to the brush motor, and may be any motor that generates a driving force that reciprocates the shaft 2 in the axial direction.

  The motor 3 is covered with a motor housing 4 made of resin. A connector 15 is integrally formed on one end side of the motor housing 4, and a resin flange portion 4a is integrally formed on the other end side thereof. Inside the motor housing 4, a magnetic sensor 16, a sensor magnet 17, and a sensor shaft 18 for detecting the position of the shaft 2 are installed.

  A bush 20 and a metal boss 21 are installed on the side of the motor housing 4 on which the resin flange portion 4a is formed. The bush 20 and the metal boss 21 penetrate the shaft 2. A wastegate valve (not shown) is connected to the end of the shaft 2 that penetrates the bush 20 and the metal boss 21.

  The bush 20 has a flange portion 20a and a cylindrical portion 20b. A flange portion 20a is formed on the motor 3 side of the cylindrical portion 20b, and a through hole for the shaft 2 is formed on the opposite side. The flange portion 20a is fitted to the side of the motor housing 4 on which the resin flange portion 4a is formed. The cylindrical portion 20b guides the movement of the shaft 2 in the axial direction. The seal member 24 closes the gap between the bush 20 and the shaft 2. The seal member 24 is, for example, an O-ring. The cap 23 is fitted to the through hole side of the bush 20 and supports the seal member 24. The bush 20 and the cap 23 are made of, for example, resin in order to suppress abrasion of the shaft 2 that comes into contact with the inner peripheral surface.

  A metal boss 21 that covers the bush 20 is provided on the outer periphery of the bush 20. The metal boss 21 has a metal flange portion 21a and a cylindrical portion 21b. A metal flange portion 21a is formed on the motor 3 side of the cylindrical portion 21b, and a through hole for the shaft 2 is formed on the opposite side. The metal flange portion 21a is fastened to the resin flange portion 4a of the motor housing 4 with a screw 25. The screw 25 is passed through the hole 4b of the resin flange portion 4a and the hole 21c of the metal flange portion 21a. Further, the metal flange portion 21a is fastened together with the resin flange portion 4a to the mounting portion 102 by the screw 26. The screw 26 is passed through the hole 4c of the resin flange portion 4a and the hole 21d of the metal flange portion 21a. Since the resin flange portion 4a and the metal flange portion 21a are fastened together with the mounting portion 102, the resin flange portion 4a is fastened while pressing the metal flange portion 21a even if these components have dimensional variations. . Therefore, the resin flange portion 4a, the metal flange portion 21a, and the mounting portion 102 are in close contact with each other, and there is no gap.

  In the illustrated example, the motor housing 4 and the metal boss 21 are fastened to each other at two locations by using the two screws 25, but the invention is not limited to this and may be fastened at any location. Similarly, in the illustrated example, the motor housing 4 and the metal boss 21 are co-tightened to the mounting portion 102 using two screws 26 at two locations, but the configuration is not limited to this, and it is not limited to this. May be tightened together. For example, the motor housing 4 and the metal boss 21 are fastened to each other at two locations by using the two screws 25, and the motor housing 4 and the metal boss 21 are fastened to the mounting portion 102 together with the four screws 26. Alternatively, the configuration may be performed in four places by using.

  The metal boss 21 is made of aluminum or the like for radiating the heat H1 generated by the motor 3 to the mounting portion 102 and for radiating the heat H2 of the exhaust gas transmitted from the turbine housing of the turbocharger to the mounting portion 102. It is composed of a metal material with high thermal conductivity. Further, there is an air layer 22 between the cylindrical portion 20b of the bush 20 and the cylindrical portion 21b of the metal boss 21. The air layer 22 is a heat insulating layer that utilizes the heat insulating function of air.

  The shaft 2 is arranged in the pipe 6. A female threaded screw mechanism 13 is formed on the inner peripheral surface of the pipe 6. On the other hand, a male screw-shaped screw mechanism 14 is formed on the outer peripheral surface of the shaft 2. The screw mechanism 14 is screwed into and coupled to the screw mechanism 13. One end of the shaft 2 penetrates the motor housing 4, the bush 20 and the metal boss 21 and is connected to a wastegate valve (not shown). The other end of the shaft 2 contacts the sensor shaft 18.

  When a voltage is applied to the terminal 15a of the connector 15, a current flows to the terminal 15a, the brush 8, the commutator 7 and the coil 10. When a current flows through the coil 10, the rotor 9 is magnetized and attracted to the magnet 11. As a result, the rotor 9 rotates, and the pipe 6 and the like integrated with the rotor 9 also rotate. The rotational movement of the rotor 9 is converted into a linear movement by the connection between the screw mechanism 13 of the pipe 6 and the screw mechanism 14 of the shaft 2, and the shaft 2 is pushed out of the metal boss 21. When the current flowing through the coil 10 is reversed, the rotor 9 rotates in the opposite direction and the shaft 2 is drawn into the metal boss 21. As the shaft 2 reciprocates, a wastegate valve (not shown) opens and closes.

  The sensor magnet 17 is fixed to the sensor shaft 18. When the sensor shaft 18 reciprocates along with the reciprocating movement of the shaft 2, the sensor magnet 17 also reciprocally moves in conjunction with each other. The magnetic sensor 16 detects a magnetic flux density that changes as the sensor magnet 17 reciprocates. An arithmetic device (not shown) calculates the position of the shaft 2 based on the magnetic flux density detected by the magnetic sensor 16.

  FIG. 4 is a diagram illustrating a state where the actuator 1 according to the first embodiment of the present invention is attached to the turbocharger 100. The turbocharger 100 includes a compressor 100a and a turbine 100b. The compressor 100a is installed in the compressor housing 101a of the intake pipe 103. A mounting portion 102 for mounting the actuator 1 is formed on the compressor housing 101a. The turbine 100b is installed in the turbine housing 101b of the exhaust pipe 104. The compressor housing 101a and the turbine housing 101b are made of cast iron or the like having excellent heat resistance.

  The high-temperature exhaust gas emitted from the engine 105 flows through the exhaust pipe 104 and rotates the turbine 100b when discharged to the outside of the vehicle. The rotation amount of the turbine 100b is adjusted by the opening degree of the waste gate valve 110. Since the turbine 100b is connected to the compressor 100a, when the turbine 100b rotates, the compressor 100a also rotates. When the compressor 100a rotates, the outside air taken into the intake pipe 103 is compressed and becomes supercharged air. The supercharged air flows to the engine 105 via the intercooler 106 and the throttle valve 107. When the throttle valve 107 is closed, the air bypass valve 108 is opened and the air bypass pipe 109 is opened, and the supercharged air on the upstream side of the compressor 100a flows through the air bypass pipe 109 and returns to the downstream side of the compressor 100a.

  In FIG. 4, the motor 3 side of the actuator 1 is arranged on the side of the compressor 100a having a relatively low temperature. On the other hand, the metal boss 21 side of the actuator 1 is arranged on the turbine 100b side having a relatively high temperature. Further, since the mounting portion 102 is connected to the compressor housing 101a having a relatively low temperature, the mounting portion 102 also has a relatively low temperature.

  The heat H2 of the exhaust gas of the turbine housing 101b propagates through the wastegate valve 110, the shaft 2, and the metal boss 21, and is radiated to the mounting portion 102 with which the metal flange portion 21a contacts. Since the metal boss 21 is made of a metal material having high thermal conductivity, the heat H2 can be efficiently radiated to the mounting portion 102. Further, since the resin flange portion 4a of the motor housing 4 and the metal flange portion 21a of the metal boss 21 are fastened together with the mounting portion 102 by the screw 26, the metal flange portion 21a and the mounting portion 102 are in close contact with each other, and the heat H2 Is easily transmitted from the metal flange portion 21a to the mounting portion 102. With these configurations, the temperature rise of the actuator 1 can be suppressed, and the motor housing 4 made of resin, which is weak against heat, can be protected.

  Further, the air layer 22 provided between the metal boss 21 and the bush 20 suppresses the transfer of the heat H2 from the metal boss 21 to the bush 20. This makes it possible to protect the resin bush 20 and the cap 23, which are weak against heat.

  Further, the heat H1 generated by the coil 10 or the like when the motor 3 is driven travels through the metal boss 21 from the bearing portion 5b or the resin flange portion 4a from the motor housing 4, and the mounting portion 102 with which the metal flange portion 21a comes into contact. Is radiated to. As a result, the temperature rise of the actuator 1 can be suppressed, and the motor housing 4 made of resin, which is weak against heat, can be protected.

  As described above, in the actuator 1 according to the first embodiment, the motor 3 that moves the shaft 2 in the axial direction is covered with the motor housing 4 made of resin, and the resin flange portion 4a formed in the motor housing 4. A bush 20 which penetrates the shaft 2 and in which the shaft 2 moves in the axial direction thereof; a metal boss 21 which is located on the outer periphery of the bush 20 and supports the bush 20; The metal flange portion 21a is fastened together with the mounting portion 102 of the turbocharger 100 together with the portion 4a and is in contact with the mounting portion 102. By joint tightening, the metal flange portion 21a and the mounting portion 102 are in close contact with each other. Accordingly, the heat H1 generated by the motor 3 and the heat H2 generated by the turbocharger 100 can be radiated from the metal flange portion 21a to the mounting portion 102, and the temperature rise of the actuator 1 can be suppressed. Therefore, the heat resistance of the actuator 1 is improved, and the actuator can be used for opening and closing the waste gate valve 110 of the turbocharger 100.

  Further, the actuator 1 according to the first embodiment has the air layer 22 between the metal boss 21 and the bush 20. The heat insulating function of air can be used to suppress the transfer of the heat H2 from the metal boss 21 to the bush 20 and the like. Therefore, the temperature rise of the actuator 1 can be suppressed.

The actuator 1 may have a configuration in which at least a part of the metal boss 21 and the bush 20 are in contact with each other.
FIG. 5 is a sectional view of the actuator 1 according to the first embodiment of the present invention taken along the line AA of FIG. The cylindrical portion 21b of the metal boss 21 is eccentric with respect to the center O of the shaft 2 and the cylindrical portion 20b. As a result, the metal boss 21 and the bush 20 contact at the contact portion B. With this configuration, the heat H1 generated by the motor 3 is transmitted through the motor housing 4, the bush 20, the contact portion B, and the metal boss 21, and is radiated from the metal flange portion 21a to the mounting portion 102. Therefore, the temperature rise of the actuator 1 can be suppressed.

Embodiment 2.
FIG. 6 is a sectional view showing a configuration example of the metal boss 21 of the actuator 1 according to the second embodiment of the present invention. The actuator 1 according to the second embodiment has a configuration in which a drain hole 21e is added to the actuator 1 of the first embodiment shown in FIG. 6, parts that are the same as or correspond to those in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted.

  The water drain hole 21e is a hole for discharging foreign matter such as water and dust that has entered the metal boss 21 to the outside of the metal boss 21. Foreign substances such as water and dust enter the metal boss 21 from between the resin flange portion 4a and the metal flange portion 21a and between the metal flange portion 21a and the mounting portion 102, for example. The metal boss 21 has a through hole for penetrating the shaft 2. However, since the gap between the shaft 2 and the through hole is small, foreign matter is likely to stay in the metal boss 21. For example, when water stays in the metal boss 21, the heat insulating function of the air layer 22 deteriorates. Further, depending on the usage environment of the actuator 1, the stayed water may freeze and damage the actuator 1. Therefore, it is desirable that the water that has entered the metal boss 21 be promptly discharged from the water drain hole 21e to the outside of the metal boss 21.

  In the example of FIG. 6, a drain hole 21e is formed in the lower portion of the cylindrical portion 21b in the direction of gravity so that foreign matter in the metal boss 21 can be easily discharged. In FIG. 6, when the upper side of the drawing is the upper side in the gravity direction G1 and the lower side of the drawing is the lower side in the gravity direction G1, water is likely to be drained from the drain hole 21e. Alternatively, depending on the mounting angle of the actuator 1, the right side of the drawing may be the upper part in the gravity direction G2 and the left side of the drawing may be the lower part in the gravity direction G2. Even in that case, water is likely to be discharged from the drain hole 21e.

  Depending on the mounting angle of the actuator 1, the drain hole 21e is not always located at the lower part in the direction of gravity. Therefore, the actuator 1 may be configured such that the water drain hole 21e of the metal boss 21 is located at the lower portion in the gravity direction regardless of the attachment angle of the actuator 1. A specific example is shown in FIG.

  FIG. 7 is a plan view showing a configuration example of the motor housing 4 and the metal boss 21 in the actuator 1 according to the second embodiment of the present invention. The metal flange portion 21a of the metal boss 21 has four holes 21d-1, 21d-2, 21d-3, 21d-4 arranged around the cylindrical portion 21b at equal intervals. On the other hand, the resin flange portion 4a of the motor housing 4 has two holes 4c-1 and 4c-2. It should be noted that the hole 21c is omitted in FIG.

In FIG. 7, the upper side of the drawing is the upper portion in the gravity direction G3, and the lower side of the drawing is the lower portion in the gravity direction G3. Therefore, it is desirable that the water drain hole 21e be arranged at the lower portion in the gravity direction G3.
Here, it is assumed that the connector 15 of the motor 3 is arranged on the upper side in the gravity direction G3 due to the wiring. In this case, the hole 21d-1 and the hole 4c-1 are fastened together with the mounting portion 102, and the hole 21d-3 and the hole 4c-2 are fastened together with the mounting portion 102.

  Alternatively, the connector 15 of the motor 3 may be arranged in the lower part in the gravity direction G3 due to the wiring. In this case, the hole 21d-1 and the hole 4c-2 are fastened together with the mounting portion 102, and the hole 21d-3 and the hole 4c-1 are fastened together with the mounting portion 102. As a result, the drain hole 21e of the metal boss 21 and the connector 15 of the motor 3 are arranged in the lower portion in the gravity direction G3.

In this way, by changing the combination of the holes for fastening the metal flange portion 21a and the resin flange portion 4a together, the mounting angle of the metal flange portion 21a with respect to the resin flange portion 4a in the circumferential direction about the shaft 2 can be set. It can be rotated by 90 degrees. Thereby, the position of the drain hole 21e can be easily changed.
In the illustrated example, the motor housing 4 and the metal boss 21 are fastened to the mounting portion 102 together by using the two screws 26 at two locations, but the present invention is not limited to this, and at any location. You may tighten it. For example, the number of holes 4c-1 and 4c-2 of the resin flange portion 4a is increased to four, and the motor housing 4 and the metal boss 21 are co-tightened to the mounting portion 102 by using four screws 26 at four locations. It may be configured to perform.

  As described above, the metal boss 21 according to the second embodiment has the drain hole 21e. As a result, it is possible to prevent water, dust, and the like from remaining in the metal boss 21, and to suppress deterioration of the heat insulating function of the air layer 22.

  Further, in the actuator 1 according to the second embodiment, the number of the holes 21d-1 to 21d-4 of the metal flange portion 21a is equal to or more than the number of the holes 4c-1 and 4c-2 of the resin flange portion 4a, and the metal flange portion By changing the combination of the holes for fastening 21a and the resin flange portion 4a together, the mounting angle of the metal flange portion 21a with respect to the resin flange portion 4a in the circumferential direction with the shaft 2 as the center can be changed. Thereby, the position of the drain hole 21e can be easily changed.

In the illustrated example, four holes 21d-1 to 21d-4 are provided in the metal flange portion 21a, but the number of holes may be arbitrary. As the number of holes increases, the number of combinations of holes for fastening the metal flange portion 21a and the resin flange portion 4a together increases, and the possible positions of the drain holes 21e increase.
Further, in the illustrated example, the number of holes of the metal flange portion 21a is equal to or larger than the number of holes of the resin flange portion 4a, but conversely, the number of holes of the resin flange portion 4a is the number of holes of the metal flange portion 21a. Or more. Also in the case of this configuration, by changing the combination of the holes for fastening the metal flange portion 21a and the resin flange portion 4a together, the metal flange portion 21a with respect to the resin flange portion 4a in the circumferential direction with the shaft 2 as the center. The mounting angle can be changed.

  It should be noted that, within the scope of the invention, the present invention can freely combine the respective embodiments, modify any constituent element of each embodiment, or omit any constituent element of each embodiment.

  Since the turbocharger actuator according to the present invention has improved heat resistance, it is suitable for use as an actuator that operates a wastegate valve, a variable geometry vane, or the like used at high temperatures.

  DESCRIPTION OF SYMBOLS 1 actuator, 2 shafts, 3 motors, 4 motor housings, 4a resin flange parts, 4b-1, 4c, 4c-1, 4c-2, 21c, 21d, 21d-1 to 21d-4 holes, 5a, 5b bearing parts, 6 Pipe, 7 commutator, 8 brush, 9 rotor, 10 coil, 11 magnet, 12 yoke, 13, 14 screw mechanism, 15 connector, 15a terminal, 16 magnetic sensor, 17 sensor magnet, 18 sensor shaft, 20 bush , 20a Flange part, 20b, 21b Cylindrical part, 21 Metal boss, 21a Metal flange part, 21e Drain hole, 22 Air layer, 23 Cap, 24 Seal member, 25, 26 Screw, 100 Turbocharger, 100a Compressor, 100b Turbine , 101a Compressor housing, 101 Turbine housing, 102 mounting part, 103 intake pipe, 104 exhaust pipe, 105 engine, 106 intercooler, 107 throttle valve, 108 air bypass valve, 109 air bypass pipe, 110 waste gate valve, B contact part, G1, G2, G3 Gravity direction, H1, H2 heat, O 2 center.

Claims (5)

A motor covered with a resin housing for moving the shaft in the axial direction,
A resin flange portion formed on the housing,
A bush penetrated by the shaft, in which the shaft moves in the axial direction thereof;
Located on the outer periphery of the bush, a metal boss that supports the bush,
An actuator for a turbocharger, comprising: a metal flange portion formed on the metal boss and fastened together with the resin flange portion to a mounting portion of the turbocharger and contacting the mounting portion.   The turbocharger actuator according to claim 1, wherein there is an air layer between the metal boss and the bush.   The turbocharger actuator according to claim 1, wherein at least a part of the metal boss and the bush are in contact with each other.   The turbocharger actuator according to claim 1, wherein the metal boss has a drain hole.   Either one of the number of holes for threading the metal flange portion and the number of holes for threading the resin flange portion is the other or more, and the metal flange portion and the resin flange portion are fastened together. The actuator for a turbocharger according to claim 4, wherein a mounting angle of the metal flange portion with respect to the resin flange portion in a circumferential direction around the shaft can be changed by changing a combination of holes. .

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