WO2018150575A1

WO2018150575A1 - Turbocharger actuator

Info

Publication number: WO2018150575A1
Application number: PCT/JP2017/006145
Authority: WO
Inventors: 孝典石原
Original assignee: 三菱電機株式会社
Priority date: 2017-02-20
Filing date: 2017-02-20
Publication date: 2018-08-23
Also published as: JPWO2018150575A1; JP6687292B2; CN210422762U

Abstract

An actuator (1) is provided with a motor housing (4) made of resin and a metal boss (21). A resin flange section (4a) of the motor housing (4) and a metal flange section (21a) of the metal boss (21) are both fastened to an attachment section (102) of a turbocharger (100).

Description

Turbocharger actuator

This invention relates to an actuator for a turbocharger.

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 in the housing, and the flange portion is fastened to the compressor housing of the turbocharger with a screw.

International Publication No. 2016/135825

Since the conventional actuator is configured as described above, the resin flange 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 high temperature due to the heat of the exhaust gas, the flange portion of the actuator becomes high temperature due to the heat of the turbocharger. As a result, resin-sensitive parts such as the housing of the actuator may be melted. Thus, the conventional actuator had the subject that heat resistance is low.

The present invention has been made to solve the above-described problems, and aims to improve the heat resistance of an actuator for a turbocharger.

The turbocharger actuator according to the present invention includes a motor covered with a resin housing that moves the shaft in the axial direction, a resin flange formed on the housing, and a shaft that passes through the shaft. A bush that moves in the axial direction, a metal boss that is located on the outer periphery of the bush and supports the bush, and a metal flange that is formed on the metal boss and is fastened together with the mounting portion of the turbocharger together with the resin flange portion. Part.

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

It is an external appearance perspective view which shows the structural example of the actuator which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structural example of the actuator which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the structural example of the actuator which concerns on 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 the turbocharger. FIG. 3 is a cross-sectional view of the actuator according to the first embodiment of the present invention cut along line AA in FIG. It is sectional drawing which shows the structural example of the metal boss | hub of the actuator which concerns on Embodiment 2 of this invention. It is a top view which shows the structural example of the motor housing and metal boss | hub in the actuator which concerns on Embodiment 2 of this invention.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
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 cross-sectional view showing a configuration example of the actuator 1 according to Embodiment 1 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 Embodiment 1 reciprocates the shaft 2 in the axial direction. Hereinafter, the actuator 1 is used for opening and closing a waste gate valve of a turbocharger. The actuator 1 is attached to a turbocharger attaching portion 102 by a screw 26.

The motor 3 generates a driving force for reciprocating the shaft 2 in the axial direction. The motor 3 is a motor with a brush including a commutator 7, a brush 8, a rotor 9, a coil 10, a magnet 11, and a yoke 12. Two bearing

portions

5a and 5b are installed inside the motor 3, and the bearing

portions

5a and 5b support the pipe 6 in a rotatable manner. 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 side of the rotor 9 and the coil 10. The motor 3 is not limited to a motor with a brush, and any motor 3 that generates a driving force for reciprocating the shaft 2 in the axial direction thereof may be used.

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

The bush 20 and the metal boss 21 are installed on the side of the motor housing 4 where the resin flange portion 4a is formed. The bush 20 and the metal boss 21 are passed through the shaft 2. A waste gate valve (not shown) is connected to the end of the shaft 2 that passes through 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 of the shaft 2 is formed on the opposite side. The flange portion 20a is fitted to the side of the motor housing 4 where 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. This 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 the shaving of the shaft 2 that contacts 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 of the shaft 2 is formed on the opposite side. The metal flange portion 21 a is fastened to the resin flange portion 4 a 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 mounting portion 102 together with the resin flange portion 4a by a 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 there is a dimensional variation in these parts. . Therefore, the resin flange portion 4a, the metal flange portion 21a, and the attachment 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 at two locations using two screws 25. However, the present invention is not limited to this and may be fastened at some locations. Similarly, in the illustrated example, the motor housing 4 and the metal boss 21 are fastened to the attachment portion 102 at two locations using two screws 26. It may be tightened together. For example, the motor housing 4 and the metal boss 21 are fastened at two locations using two screws 25, and the motor housing 4 and the metal boss 21 are fastened to the mounting portion 102 by four screws 26. You may make it the structure performed in four places using.

The metal boss 21 is made of aluminum or the like to radiate heat H1 generated by the motor 3 to the mounting portion 102 and to radiate heat H2 of 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. An air layer 22 exists between the cylindrical portion 20 b of the bush 20 and the cylindrical portion 21 b of the metal boss 21. This air layer 22 is a heat insulating layer utilizing the heat insulating function of air.

The shaft 2 is disposed in the pipe 6. A female screw-shaped 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 side of the shaft 2 passes through the motor housing 4, the bush 20 and the metal boss 21, and is connected to a waste gate valve (not shown). The other end side of the shaft 2 is in contact with 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 motion of the rotor 9 is converted into a linear motion by the coupling of 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 reverse direction, and the shaft 2 is drawn into the metal boss 21. As the shaft 2 reciprocates, a waste gate valve (not shown) opens and closes.

The sensor magnet 17 is fixed to the sensor shaft 18. When the sensor shaft 18 reciprocates as the shaft 2 reciprocates, the sensor magnet 17 also reciprocates. The magnetic sensor 16 detects a magnetic flux density that changes as the sensor magnet 17 reciprocates. A calculation 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 in which the actuator 1 according to Embodiment 1 of the present invention is attached to the turbocharger 100. The turbocharger 100 includes a compressor 100a and a turbine 100b. The compressor 100 a is installed in the compressor housing 101 a of the intake pipe 103. An attachment portion 102 for attaching the actuator 1 is formed in the compressor housing 101a. The turbine 100 b is installed in the turbine housing 101 b 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.

When the high-temperature exhaust gas emitted from the engine 105 flows through the exhaust pipe 104 and is discharged outside the vehicle, the turbine 100b is rotated. The amount of rotation of the turbine 100 b 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. 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.

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

The heat H2 of the exhaust gas in the turbine housing 101b is transmitted to the waste gate valve 110, the shaft 2, and the metal boss 21, and is radiated to the mounting portion 102 where the metal flange portion 21a contacts. Since the metal boss 21 is made of a metal material having a 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 heat H2 Is easily transmitted from the metal flange portion 21 a to the mounting portion 102. With these configurations, the temperature increase of the actuator 1 can be suppressed, and the resin motor housing 4 that is weak against heat can be protected.

Further, the air layer 22 provided between the metal boss 21 and the bush 20 suppresses transmission of heat H2 from the metal boss 21 to the bush 20. Thereby, the resin bush 20 and the cap 23 which are weak against heat can be protected.

Furthermore, the heat H1 generated by the coil 10 or the like when the motor 3 is driven is transmitted from the bearing portion 5b to the metal boss 21 or from the motor housing 4 to the resin flange portion 4a, and the attachment portion 102 in contact with the metal flange portion 21a. The heat is dissipated. Thereby, the temperature rise of the actuator 1 can be suppressed and the resin-made motor housing 4 weak to heat can be protected.

As described above, the actuator 1 according to the first embodiment includes the motor 3 covered with the resin motor housing 4 that moves the shaft 2 in the axial direction, and the resin flange portion 4a formed on the motor housing 4. A bush 20 that penetrates the shaft 2 and in which the shaft 2 moves in the axial direction, a metal boss 21 that is located on the outer periphery of the bush 20 and supports the bush 20, and a metal boss 21. The metal flange part 21a which is fastened together with the attachment part 102 of the turbocharger 100 together with the part 4a and contacts the attachment part 102 is provided. The metal flange portion 21a and the mounting portion 102 are brought into close contact with each other. Thereby, 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 an air layer 22 between the metal boss 21 and the bush 20. Utilizing the heat insulation function of air, the transmission of heat H2 from the metal boss 21 to the bush 20 or the like can be suppressed. Therefore, the temperature rise of the actuator 1 can be suppressed.

The actuator 1 may be configured such that at least a part of the metal boss 21 and the bush 20 are in contact with each other.
FIG. 5 is a cross-sectional view of the actuator 1 according to the first embodiment of the present invention cut along the line AA in FIG. The cylindrical portion 21b of the metal boss 21 is eccentric with respect to the center 2 of the shaft 2 and the cylindrical portion 20b. As a result, the metal boss 21 and the bush 20 abut at the abutting portion B. With this configuration, the heat H <b> 1 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 21 a to the mounting portion 102. Therefore, the temperature rise of the actuator 1 can be suppressed.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view showing a configuration example of the metal boss 21 in the actuator 1 according to Embodiment 2 of the present invention. The actuator 1 according to the second embodiment has a configuration in which a water drain hole 21e is added to the actuator 1 of the first embodiment shown in FIG. In FIG. 6, the same or corresponding parts as those in FIG.

The drain hole 21 e 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 matters 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 attachment portion 102, for example. The metal boss 21 has a through hole for allowing the shaft 2 to pass therethrough. However, since the gap between the shaft 2 and the through hole is very small, foreign matter tends to stay in the metal boss 21. For example, when water stops in the metal boss 21, the heat insulation function of the air layer 22 is lowered. Further, depending on the usage environment of the actuator 1, the water that has stopped may freeze and damage the actuator 1. Therefore, it is desirable to quickly drain the water that has entered the metal boss 21 out of the metal boss 21 through the drain hole 21e.

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

Depending on the mounting angle of the actuator 1, the drain hole 21e is not necessarily located at the lower part in the direction of gravity. Therefore, the actuator 1 may be configured such that the drain hole 21e of the metal boss 21 is located in the lower part in the direction of gravity regardless of the mounting 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 Embodiment 2 of the present invention. The metal flange portion 21a of the metal boss 21 has four holes 21d-1, 21d-2, 21d-3, and 21d-4 arranged at equal intervals around the cylindrical portion 21b. On the other hand, the resin flange portion 4a of the motor housing 4 has two holes 4c-1 and 4c-2. In FIG. 7, the hole 21c is not shown.

In FIG. 7, the upper side in the drawing is the upper part in the gravity direction G3, and the lower side in the drawing is the lower part in the gravity direction G3. Therefore, it is desirable that the drain hole 21e is disposed in the lower part in the gravity direction G3.
Here, it is assumed that the connector 15 of the motor 3 is arranged in the upper part in the gravity direction G3 due to the convenience of 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 convenience of 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. Thereby, the drain hole 21e of the metal boss 21 and the connector 15 of the motor 3 are disposed in the lower part in the gravity direction G3.

Thus, by changing the combination of the holes for fastening the metal flange portion 21a and the resin flange portion 4a together, the mounting angle in the circumferential direction around the shaft 2 of the metal flange portion 21a with respect to the resin flange portion 4a is changed. It can be rotated by 90 degrees. Thereby, the position of the drain hole 21e can be changed easily.
In the illustrated example, the motor housing 4 and the metal boss 21 are fastened to the attachment portion 102 at two locations using two screws 26. You can tighten it. For example, the number of holes 4c-1 and 4c-2 in the resin flange portion 4a is increased to four, and the motor housing 4 and the metal boss 21 are fastened to the mounting portion 102 at four locations using four screws 26. You may make it the structure to perform.

As described above, the metal boss 21 of the second embodiment has the drain hole 21e. Thereby, it is possible to prevent water, dust, and the like in the metal boss 21 from staying, and to suppress a decrease in the heat insulation function of the air layer 22.

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

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 any number. 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 increases, and the positions that the drain holes 21e can take increase.
In the illustrated example, the number of holes in the metal flange portion 21a is equal to or greater than the number of holes in the resin flange portion 4a. Conversely, the number of holes in the resin flange portion 4a is equal to the number of holes in the metal flange portion 21a. That's all. Also in the case of this configuration, by changing the combination of holes for fastening the metal flange portion 21a and the resin flange portion 4a together, the circumferential direction around the shaft 2 of the metal flange portion 21a with respect to the resin flange portion 4a is changed. The mounting angle can be changed.

In the present invention, within the scope of the invention, free combinations of the respective embodiments, modification of arbitrary components of the respective embodiments, or omission of arbitrary components of the respective embodiments are possible.

Since the turbocharger actuator according to the present invention is improved in heat resistance, it is suitable for use in an actuator for operating a waste gate valve and a variable geometry vane used at a high temperature.

1 actuator, 2 shaft, 3 motor, 4 motor housing, 4a resin flange part, 4b, 4c, 4c-1, 4c-2, 21c, 21d, 21d-1 to 21d-4 holes, 5a, 5b bearing part, 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 Comp Storage housing, 101b turbine housing, 102 mounting portion, 103 intake piping, 104 exhaust piping, 105 engine, 106 intercooler, 107 throttle valve, 108 air bypass valve, 109 air bypass piping, 110 waste gate valve, B contact portion, G1, G2, G3 Gravity direction, H1, H2 heat, O center.

Claims

A motor covered with a resin housing that moves the shaft in the axial direction;
A resin flange formed in the housing;
A bush that is penetrated by the shaft and in which the shaft moves in the axial direction;
A metal boss located on the outer periphery of the bush and supporting the bush;
A turbocharger actuator comprising: a metal flange portion that is formed on the metal boss, and is fastened together with a mounting portion of the turbocharger together with the resin flange portion to contact the mounting portion.
The turbocharger actuator according to claim 1, wherein there is an air layer between the metal boss and the bush.
2. 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.
2. The turbocharger actuator according to claim 1, wherein the metal boss has a drain hole.
One of the number of holes through which the screw passes through the metal flange portion and the number of holes through which the screw passes through the resin flange portion is equal to or greater than the other, and the metal flange portion and the resin flange portion are fastened together. 5. The turbocharger actuator 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. .