JP2005180456A - Variable displacement turbocharger of automobile internal combustion engine with moving blade type turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic controlled actuator for controlling a turbocharger enabling an increase in durability of the actuator and also an increase in reliability of the actuator. <P>SOLUTION: A motor 130, a transmission mechanism 140, and a position sensor 150 are installed in a case having a body 110 and a cover 120. The drive force of the motor 130 is taken out from an output rotating shaft 145 to the outside through the transmission mechanism 140 to drivingly rotate the moving blade of the turbocharger. A first bearing 146 rotatably pivoting the output rotating shaft is installed in the cover 120, and a second bearing rotatably pivoting the output rotating shaft is installed in a body 110. The position sensor 150 is fitted to the output shaft of the motor 130. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic control actuator, and more particularly, to an electronic control actuator for turbocharger control suitable for use in position control of movable blades of a variable displacement turbocharger of an internal combustion engine for an automobile.

For example, as an electronic control actuator, for example, as described in European Patent Application No. 1009088 (1999), an actuator composed of a motor and a speed change mechanism is known. Here, in the product of the electronic control actuator to which the technology described in European Patent Application Publication No. 1009088 (1999) is applied, one end of the output shaft of the speed change mechanism is connected to the driven member, and the other end Is provided with a position sensor. The position sensor is used for detecting the current position of the actuator and performing feedback control of the position. The output shaft is rotatably supported by two bearings. Further, the motor and the speed change mechanism are held in the body and the cover.
European Patent Application No. 1009088 (1999)

  Here, in the conventional electronic control actuator, one end of the output shaft of the shift is used for output of the driving force to the outside, and the position sensor is provided at the other end, so that the output shaft can be rotated. The two bearings to be supported are both arranged in the body, and the distance between the two bearings is short. As a result, since the shaft inclination of the output rotation shaft increases, there is a problem that 1) a decrease in vibration resistance and 2) a position error detection due to an increase in the vibration of the sensor unit occurs.

  That is, when the shaft inclination increases, firstly, the vibration of the output shaft of the actuator in the direction perpendicular to the axis increases due to the vibration of the internal combustion engine. Will occur, shortening the life of the actuator.

  Second, when the driven member of the actuator is stopped, if the output shaft of the actuator swings, the output of the position sensor changes, so that the driven member is erroneously detected as moving. Although the driven member is stopped at this position, a control signal for driving the driven member is output, and the driven member malfunctions. That is, the reliability of the actuator is lowered.

  An object of the present invention is to provide an electronically controlled actuator for turbocharger control that can improve the durability of the actuator and improve the reliability of the actuator.

(1) In order to achieve the above object, according to the present invention, a motor, a transmission mechanism, and a position sensor are incorporated in a case constituted by a body and a cover, and the driving force of the motor is transmitted to the transmission mechanism. In the electronic control actuator that takes out from the output rotating shaft to drive the driven member to rotate, the electronic control actuator is provided on the cover, provided on the cover, and provided on the body. And a second bearing for rotating and supporting the output rotation shaft, and the position sensor is attached to the output shaft of the motor.
With this configuration, the position sensor is attached to the output shaft of the motor, detects the rotation angle of the motor output shaft, and controls the output rotation shaft of the actuator. Therefore, the deflection of the output shaft of the actuator is transmitted to the position sensor. Therefore, reliability can be improved. In addition, since the two bearings are structured to be attached to the body and the cover, the span of the two bearings can be the longest. Therefore, it is possible to minimize the runout of the output rotation shaft, to minimize fretting wear, and to improve reliability.

(2) Further, according to the present invention, a motor, a speed change mechanism, and a position sensor are incorporated in a case constituted by a body and a cover, and the driving force of the motor is transmitted from the output rotation shaft via the speed change mechanism. In the electronic control actuator that takes out to the outside and rotationally drives the driven member, the cover is formed with a power supply connector to the motor, and the cover is provided with a bearing that supports one end of the output rotation shaft. The driven member is a turbocharger.
With this configuration, a power supply connector to the motor is formed on the cover, and a bearing that supports one end of the output rotation shaft is provided on the cover, so that the cover can also serve as a connector and a bearing.

(3) Further, according to the present invention, a motor, a transmission mechanism, and a position sensor are incorporated in a case constituted by a body and a cover, and the driving force of the motor is transmitted from the output rotation shaft via the transmission mechanism. In the electronic control actuator that takes out to the outside and rotationally drives the driven member, the cover is formed with a connection terminal that is plugged into a power feeding terminal formed on the motor, and the cover is connected to the output rotating shaft. A bearing that supports one end is provided, and the driven member is a turbocharger.
With such a configuration, the cover is formed with a connection terminal that is plugged into and connected to the power supply terminal formed on the motor, so that the support of the output rotating shaft and the electrical connection to the motor are performed by the cover mounting operation. It can be achieved.

(4) Further, according to the present invention, a motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is transmitted from the output rotation shaft via the speed change mechanism. In the electronic control actuator that takes out to the outside and rotationally drives the driven member, the cover is provided with a control circuit for the motor, and the cover is provided with a bearing for supporting one end of the output rotation shaft. The cover is formed with a partition that separates the bearing and the control circuit, and the driven member is a turbocharger.
With this configuration, a motor control circuit is formed on the cover, a bearing that supports one end of the output rotation shaft is provided on the cover, and a partition that separates the bearing and the control circuit is formed on the cover. Thus, the control circuit attached to the cover can be protected from the contamination of the bearing portion of the output rotating shaft by the lubricant.

(5) Further, according to the present invention, a motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is transmitted from the output rotation shaft via the speed change mechanism. In the electronically controlled actuator that is taken out and rotationally drives the driven member, the position sensor is provided on the same axis as the output shaft of the motor, the driven member is a turbocharger, and the position sensor Based on the output, the angle of the movable blade of the turbocharger is controlled.
With this configuration, since the position sensor is provided coaxially with the output shaft of the motor, the rotational angle of the turbine is not easily affected by disturbance (temperature, vibration), and can be accurately detected. The angle can be accurately controlled.

(6) Further, according to the present invention, a motor, a transmission mechanism, and a position sensor are incorporated in a case constituted by a body and a cover, and the driving force of the motor is transmitted from the output rotation shaft via the transmission mechanism. An electronic control actuator that is externally taken out and rotationally drives the driven member includes first and second bearings that rotatably support the output rotation shaft at both ends, and the driven member is a turbocharger, and The angle of the movable blade of the turbocharger is controlled based on the output of the position sensor.
With this configuration, the output rotary shaft is provided with the first and second bearings that support the both ends of the rotary shaft so that the output rotary shaft can be minimized and the fretting wear can be minimized. Therefore, reliability can be improved.

(7) Further, according to the present invention, a motor, a transmission mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is transferred from the output rotation shaft to the outside via the transmission mechanism. An electronic control actuator-integrated turbocharger in which an electronic control actuator to be taken out and a turbocharger having movable blades are integrated. The electronic control includes the first and second bearings that rotatably support the output rotation shaft at both ends. The angle of the movable blades of the turbocharger is controlled based on the output of the position sensor of the actuator.
With this configuration, the output rotary shaft is provided with the first and second bearings that rotatably support both ends, and the angle of the movable blade of the turbocharger is controlled based on the output of the position sensor of the electronic control actuator. Thus, the reliability of the electronically controlled actuator integrated turbocharger can be improved.

(8) Further, according to the present invention, the rotation of the motor is transmitted to the output rotation shaft through the gear, and the output rotation shaft is rotationally driven, and a bearing for supporting one end of the output rotation shaft is formed. In the electric actuator that attaches the motor to the body and covers the other end of the motor, gear, and output shaft with a resin cover fixed to the body, a power supply connector to the motor is provided on the outer surface portion of the cover. Formed on the inner surface of the cover is electrically connected to the connector and electrically connected to the motor, and the inner ring is fixed to the other end of the output rotating shaft. The outer ring of the bearing is fixed.
With this configuration, the cover member can also serve as an electrical connector and a bearing bearing holding member.

(9) Further, in the present invention, the rotation of the motor is transmitted to the output rotation shaft via the gear, and the output rotation shaft is rotationally driven, and a bearing is formed which supports one end of the output rotation shaft. In the electric actuator that attaches the motor to the body and covers the other end of the motor, the gear, and the output shaft with a resin cover fixed to the body, the power supply terminal of the motor is inserted and connected to the resin cover. And a bearing holding portion for holding the outer ring of the bearing having the inner ring fixed to the other end of the output rotating shaft.
With this configuration, it is possible to achieve the support of the output rotating shaft and the electrical connection of the motor by the cover member attaching operation.

(10) Further, according to the present invention, the rotation of the motor is transmitted to the output rotation shaft via the gear, and the output rotation shaft is rotationally driven, and a bearing for supporting one end of the output rotation shaft is formed. In the electric actuator that attaches the motor to the body and covers the other end of the motor, gear, and output shaft with the resin cover fixed to the body, the motor control circuit is attached to the inner surface of the resin cover, The resin cover is electrically connected to a connector formed on the outer surface of the resin cover, and the resin cover holds an outer ring of a bearing having an inner ring fixed to the other end of the output rotation shaft, A partition for isolating the control circuit is attached to the cover.
With such a configuration, the control circuit attached to the cover member can be protected from contamination by the lubricant in the bearing portion of the output rotating shaft.

(11) Further, according to the present invention, in the movable blade type turbine in which the angle of the movable blade is controlled by an output rotation shaft that is rotationally driven by a motor, a magnetic encoder is provided on the output shaft of the motor, and the angle of the movable blade is The magnetic encoder is configured to be physically controlled as a function of the output pulse of the magnetic encoder.
With this configuration, the rotational angle of the movable blades of the turbine can be accurately controlled even under disturbance (temperature, vibration).

(12) Further, the present invention is a movable blade type turbine in which an angle of a movable blade is controlled by an output rotation shaft that is rotationally driven by a motor, and the rotation of the motor is transmitted to the output rotation shaft through a gear. The output rotating shaft is driven to rotate, and the motor is attached to a body on which a bearing for supporting one end of the output rotating shaft is formed, and the motor, gear, and output shaft are fixed by a resin cover fixed to the body. In the movable blade-type turbine covering the other end of the motor, a magnetic encoder is provided on the output shaft of the motor, a control circuit of the motor is attached to an inner surface of the resin cover facing the magnetic encoder, and the outer side of the resin cover It is electrically connected to a connector formed on the surface, and a magnetoelectric conversion element for detecting a change in magnetic flux of the magnetic encoder is attached to the control circuit.
With this configuration, it is possible to share part of the control circuit for the actuator motor of the movable blade turbine and the rotation sensor.

(13) In the above (12), preferably, a partition wall for partitioning the magnetoelectric transducer and the encoder is attached to the resin cover.
With such a configuration, it is possible to suppress adhesion of bearing grease and gear powder to the magnetoelectric conversion element.

(14) In the above (12), preferably, the inner surface portion of the resin cover is provided with a bearing mounting portion that supports the electric terminal of the motor and the other end of the output rotating shaft with the control circuit interposed therebetween. It is what.
With this configuration, the resin cover can hold the control circuit of the actuator motor of the movable blade type turbine, a part of the rotation sensor, and the bearing.

  According to the first aspect of the present invention, there is an effect that the durability of the actuator can be improved and the reliability of the actuator can be improved.

  According to the second aspect of the present invention, the cover is provided with a power feeding connector to the motor, and the cover is provided with a bearing for supporting one end of the output rotation shaft. There is an effect of being able to serve as both.

  Further, according to the invention described in claim 3, since the cover is formed with the connection terminal that is plugged into the power feeding terminal formed in the motor, the cover is attached to the output rotating shaft, There is an effect that an electrical connection to the motor can be achieved.

  According to a fourth aspect of the present invention, a motor control circuit is formed in the cover, a bearing for supporting one end of the output rotation shaft is provided on the cover, and the bearing and the control circuit are provided in the cover. Therefore, the control circuit attached to the cover can be protected from the contamination of the bearing portion of the output rotating shaft by the lubricant.

  According to the invention of claim 5, since the position sensor is provided coaxially with the output shaft of the motor, the rotation angle of the turbine is not easily affected by disturbance (temperature, vibration) and is accurately detected. It is possible to accurately control the angle of the movable blades of the turbocharger.

  According to the invention described in claim 6, since the output rotary shaft is provided with the first and second bearings that rotatably support both ends, it is possible to minimize the deflection of the output rotary shaft. It is possible to minimize fretting wear and improve the reliability.

  According to the seventh aspect of the present invention, the first and second bearings that rotatably support the output rotating shaft at both ends are provided, and the angle of the movable blade of the turbocharger is determined based on the output of the position sensor of the electronic control actuator. Therefore, the reliability of the electronically controlled actuator integrated turbocharger can be improved.

  Further, according to the invention described in claim 8, there is an effect that the cover member can serve as both the electrical connector and the bearing holding member.

  According to the ninth aspect of the present invention, there is an effect that the support of the output rotating shaft and the electrical connection of the motor can be achieved by the work of attaching the cover member.

  Further, according to the invention described in claim 10, there is an effect that the control circuit attached to the cover member can be protected from contamination by the lubricant in the bearing portion of the output rotating shaft.

  Further, according to the invention described in claim 11, there is an effect that the rotation angle of the movable blade of the turbine can be accurately controlled even under disturbance (temperature, vibration).

  According to the twelfth aspect of the present invention, there is an effect that a part of the rotation sensor and the control circuit for the actuator motor of the movable blade turbine can be shared.

  According to the thirteenth aspect of the present invention, there is an effect that it is possible to suppress bearing grease and gear powder from adhering to the magnetoelectric conversion element.

  According to the fourteenth aspect of the present invention, there is an effect that the control circuit of the actuator motor of the movable blade type turbine, a part of the rotation sensor, and the bearing can be held by the resin cover.

Hereinafter, the configuration of an electronic control actuator according to an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the electronic control actuator according to the present embodiment will be described with reference to FIGS.
FIG. 1 is a perspective view of a state in which a cover showing a configuration of an electronic control actuator according to an embodiment of the present invention is removed. FIG. 2 is an external perspective view showing a configuration of an electronic control actuator according to an embodiment of the present invention. FIG. 3 is a perspective view of the inside of the cover used in the electronic control actuator according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of an electronically controlled actuator according to an embodiment of the present invention. In addition, in each figure of FIGS. 1-4, the same code | symbol has shown the identical part.

  As shown in FIG. 1, the electronic control actuator 100 according to the present embodiment includes a body 110, a cover 120, a motor 130, a speed change mechanism 140, and a position sensor 150. The motor 130, the speed change mechanism 140, and the position sensor 150 are housed between the body 110 and the cover 120.

  A motor 130 is fixed to the body 110 by a band and a screw. A power supply connector 121 is integrally formed on the cover 120. The motor 130 is, for example, a brushed DC motor.

  The transmission mechanism 140 includes a pinion gear 141, a gear 142, a worm gear 143, a wheel gear 144, and an output rotation shaft 145. The pinion gear 141 is press-fitted into the output shaft of the motor 130. The pinion gear 141 is meshed with the gear 142. The gear 142 and the worm gear 143 are integrally formed of the same member on the same axis. Note that the gear 142 and the worm gear 143 may be formed of different members. In this case, it may be fixed with an adhesive or the like and integrated on the same axis.

  Further, a wheel gear 144 is engaged with the worm gear 143. Therefore, the rotational torque generated by the motor 130 is transmitted between the pinion gear 141 and the gear 142 after being decelerated or increased, and further transmitted between the worm gear 143 and the wheel gear 144 after being decelerated or increased, and is output from the actuator. It is transmitted to the rotating shaft 145. A first bearing 146 </ b> A is attached to the output rotation shaft 145. The second bearing 146B will be described later with reference to FIG.

  The electronic control actuator according to the present embodiment is used for position control of movable blades of a turbocharger that is a driven member. The position sensor 150 is provided for detecting the position of the movable blade. The position sensor 150 includes magnet plates (encoder disks) 151 and 152 and Hall ICs 153 and 154 which will be described later with reference to FIG. The magnet plates 151 and 152 are respectively fixed on the same axis as the output shaft of the motor 130. As shown in FIG. 3, the Hall ICs 153 and 154 are mounted on the control circuit 30 so as to face the outer circumferences of the magnet plates 151 and 152, respectively. When the magnet plates 151 and 152 are rotated, the outputs of the Hall ICs 153 and 154 can be changed to ON and OFF due to the change in magnetic flux. That is, the position sensor 150 uses a magnetic encoder composed of magnet plates 151 and 152 and Hall ICs 153 and 154.

  As the members of the magnet plates 151 and 152, for example, a resin material such as PPS is used, and an increase in the moment of inertia at the time of motor rotation is suppressed, and the start delay time until the motor starts moving from the stop state of the actuator is reduced. ing. The magnet plates 151 and 152 are fixed to the output shaft of the motor 130 or the pinion gear 141 with an adhesive. The magnet plates 151 and 152 may be formed integrally with the output shaft of the motor 130 or the pinion gear 141.

  Magnets 151 and 152 are embedded with magnets so that the outer peripheral portions have the same polarity at equal angular pitches. As the motor 130 rotates, the magnetic flux change detection portions of the Hall ICs 153 and 154 (inside the Hall IC are shown in the figure). (Omitted) alternately change the magnetic flux, and turn the Hall ICs 153 and 154 on and off. The change in the output of the Hall IC 153 is caused by the change in the magnetic flux of the magnet plate 151, and the change in the output of the Hall IC 154 is caused by the change in the magnetic flux of the magnet plate 152.

  Here, the output phases of the magnet plate 151 and the magnet plate 152 are shifted from each other by ¼ period, and the motor 130 is rotated forward or backward by detecting the overlapping state of the ON and OFF patterns. Judge whether it is.

As described above, the operating angle of the movable blade of the turbocharger can be physically controlled as a function of the output pulse of the magnetic encoder that is the position sensor 150. For example, if the operating angle of the movable blade is θv, the total reduction ratio of the transmission mechanism composed of the pinion gear 141 and the gear 142 and the worm gear 143 and the wheel gear 144 is n, and the angular pitch of the magnet plate 151 is θe, The relationship between the operating angle θv and the number P of output pulses for obtaining this is expressed by the following equation (1).

θv = P × (θe / n) (1)

Here, the number P of output pulses is an integer, and (θe / n) is the angular resolution of the actuator shown in this embodiment. Further, the value of the total reduction ratio n is smaller than 1 (increases) when it is desired to increase the rotational speed of the output rotary shaft 145 with respect to the rotational speed of the motor 130. However, in the case of this actuator, it is common to reduce the motor with a small torque at a high speed but with a small torque with a gear to obtain a desired torque and output shaft rotation speed. Is generally greater than 1. In the case of this example, the magnet plate 152 is used only for discriminating the rotational direction from the output phase difference. However, since the AND condition of the output of the Hall ICs 153 and 154 with respect to the magnet plate 151 and the magnet plate 152 can be obtained, a pulse signal divided by a quarter period can be obtained with respect to the case of only the Hall IC 153. Furthermore, the angular resolution may be increased.

  As described above, the present embodiment is characterized in that the magnet plates 151 and 152 constituting the position sensor 150 are attached to the output shaft of the motor 130. Conventionally, since the position sensor is attached to the output shaft of the speed change mechanism, if the output shaft of the speed change mechanism swings, the reliability is lowered. On the other hand, in this embodiment, a position sensor is attached to the output shaft of the motor, the rotation angle of the motor output shaft is detected, and the output rotation shaft of the actuator is controlled. Therefore, since the deflection of the output shaft of the actuator is not transmitted to the position sensor, the reliability can be improved. Note that the attachment positions of the magnet plates 151 and 152 are synonymous with the input shaft of the speed change mechanism 140.

  Further, when the speed change mechanism 150 is a speed reduction mechanism, the position sensor 150 is mounted on the power source (motor 130) side of the gear speed reduction portion (total speed reduction ratio n). It is sufficient that the sensor resolution is 1 / n times the angular resolution, and the sensitivity is low even with respect to erroneous detection due to vibration due to vibration, and erroneous detection is less likely to occur. Therefore, it is possible to avoid erroneous detection of the sensor position. In addition, when a magnet plate having the same sensor resolution as that of the prior art is used, the resolution of the entire sensor can be improved by a factor of n.

  Next, as shown in FIG. 2, a link 147 is fixed to the output rotation shaft 145. As described later with reference to FIG. 5, the arc movement of the link 147 operates the movable blade 230 of the turbocharger 200 via the link 292 to perform position control. A cover 148 is provided at the base of the link 147. The cover 148 is provided to prevent dust and the like from entering the actuator 100 from the outside.

  Next, the configuration of the cover 120 will be described with reference to FIG. As shown in FIG. 2, the cover 120 is fitted into the body 110 that holds and fixes the motor 130 and the speed change mechanism 140, so that the motor 130, the speed change mechanism 140, and the position sensor 150 can be connected to water, oil, dust, etc. Protect from. The cover 120 has the following functions.

  As shown in FIG. 1, the cover 120 is integrally formed with a power supply connector 121 to the motor 130 and the control circuit 160. Here, each terminal of the power supply connector 121 is connected to a terminal of the control circuit 160 by vibration welding (wire bonding) of the aluminum wire 122A. Accordingly, external power is supplied to the control circuit 160 via the power supply connector 121 and the aluminum wire 122A. Further, the terminal of the control circuit 160 and the motor terminals 123A and 123B are connected by an aluminum wire 122B that is wire-bonded.

  As shown in FIG. 1, the motor 130 is provided with a female power supply terminal 131B. Although there are two power supply terminals, only one power supply terminal is shown in FIG. The motor terminals 123A and 123B are formed integrally with the cover 120. The motor terminals 123A and 123B formed integrally with the cover 120 are simultaneously inserted and electrically coupled to the female-side power supply terminal 131B formed on the motor 130 side when the cover 120 is assembled. As a result, the power supplied from the power feeding connector 121A is supplied to the motor 130 via the control circuit 160 and the motor terminals 123A and 123B.

  A rectangular partition wall 124 is integrally formed on the cover 120, and the control circuit 160 is fixed to the internal space 125 by bonding or the like. The control circuit 160 is bonded to the flat portion of the space 125 with, for example, an epoxy adhesive. The space 125 is blocked by a bearing holding portion 126 and a partition wall 124 formed on the cover 120 side. The control circuit lid 127 is adhesively fixed to the end face of the partition wall 124 with an adhesive so that the control circuit 160 is not exposed to the space 125 on the bearing holding portion side. As a result, it is possible to prevent wear powder or grease scattered in the bearing portion due to the rotation of the output rotating shaft 145 from adhering to the control circuit 160 and causing a circuit failure due to a short circuit or the like.

  Next, the bearing structure of the output rotation shaft 145 of the actuator 100 will be described with reference to FIG. As shown, the output bearing. Two ball bearings 146A and 146B are used. The first ball bearing 146A supports the axial load in the axial direction and the radial direction by a bearing holding portion 126 whose outer race is integrally formed of the same material as the member of the cover 120. Here, the fit between the bearing holding portion 126 and the outer race of the ball bearing 146A is a loose fit. Further, an inner race of the ball bearing 146A is press-fitted into the output rotating shaft 145. The outer race of the second ball bearing 146B is fitted into the body 110 by press fitting, and the inner race is pressed into the output rotating shaft 145. In addition, a waterproof cover 148 is coupled to the output take-out portion of the output rotating shaft 145 together with the link 147 to prevent moisture from entering the inside when wet.

  In the present embodiment, as shown in FIG. 1, the position sensor 150 is attached to the output shaft of the motor 130, so that the two bearings (ball bearings 146 </ b> A and 146 </ b> A) are the body 110 and the cover 120, respectively. It can be set as the structure attached to. Therefore, the span of the two bearings can be made the longest. As a result, the swing of the output rotation shaft can be minimized with respect to the vibration input from the internal combustion engine. As a result, it is possible to minimize fretting wear occurring at the bearing portion and the gear meshing portion, and the durability of the actuator can be increased. Furthermore, by adopting a ball bearing as the shaft end bearing, it is possible to minimize an increase in sliding resistance in the bearing portion when the output rotating shaft 145 receives an offset load in the direction perpendicular to the shaft.

Next, the configuration of the variable capacity turbocharger to which the electronic control actuator according to the present embodiment is attached will be described with reference to FIGS.
FIG. 5 is a perspective view showing the overall configuration of a variable capacity turbocharger equipped with an electronic control actuator according to an embodiment of the present invention. FIG. 6 is an exploded front view showing the vane link arrangement in the turbine housing of the variable capacity turbocharger with the electronically controlled actuator according to one embodiment of the present invention. FIG. 7 is a layout diagram of movable blades in a variable capacity turbocharger equipped with an electronically controlled actuator according to an embodiment of the present invention. 8 is a cross-sectional view taken along the line XX in FIG. 5-8, the same code | symbol has shown the identical part.

  As shown in FIG. 5, the electronic control actuator 100 is fixed to a bracket 290 fixed to the variable capacity turbocharger 200 by screw fastening or the like. The variable capacity turbocharger 200 includes a turbine housing 210 and a compressor housing 220. The electronic control actuator 100 is coupled to a bracket 290 fixed to the compressor housing 220 by screw fastening or the like. The turbine housing 210 is heated by the passage of exhaust gas from the internal combustion engine, whereas the compressor housing 220 has a relatively small temperature rise, so that heat transfer from the turbine housing 210 to the electronic control actuator 100 is performed. Can be avoided. Here, the bracket 290 also has an action of blocking radiation heat from the turbine housing 210.

  The link 147 of the electronic control actuator 100 is connected to the rod 71 of the turbine housing 210 via the movable link 292. Therefore, the rotation operation of the electronic control actuator 100 is transmitted to the rod 294 via the movable link 292.

  A drive link 232 shown in FIG. 6 is coaxially coupled to the rod 294 shown in FIG. As shown in FIG. 6, the rotation operation of the drive link 232 is transmitted to the ring 234, and the ring 234 rotates. By rotating the ring 234, the plurality of vane links 236 arranged circumferentially inside the turbine housing 210 all rotate at equal angles.

  As shown in FIG. 7, a plurality of movable blades 230 are instructed to rotate in the turbine housing 210. As shown in FIG. 8, the movable vane 230 is coaxially coupled to the vane link 236, and the movable vane 230 rotates according to the rotation of the vane link 236. Therefore, the rotation operation of the electronic control actuator 100 can control the rotation of the movable blade 230, and as a result, the flow rate of the exhaust gas flowing in the turbine housing 210 can be controlled.

Next, the configuration of the control system of the variable capacity turbocharger to which the electronic control actuator according to the present embodiment is attached will be described with reference to FIG.
FIG. 9 is a system configuration diagram showing the configuration of a variable capacity turbocharger system equipped with an electronic control actuator according to an embodiment of the present invention. In addition, the same code | symbol as FIGS. 1-8 has shown the same part.

  In the turbine housing 210 of the variable capacity turbocharger 200, a plurality of movable blades 230 are arranged. The movable blade 230 is rotatably coupled to the movable link 292, and the movable link 292 is rotatably coupled to the rotation output shaft of the actuator 100.

  The movable blade 230 can adjust the turbine flow rate by changing the angle thereof, and as a result, the compression pressure of the compressor can be controlled to a desired value. The electronic control actuator 100 is controlled by a control circuit 160 that is fixed inside the actuator with, for example, an adhesive. The control circuit 160 compares the position detection result by the sensor in the actuator with the target opening degree information included in the communication signal from the control circuit (ECU) 300 of the internal combustion engine, and controls the actuator 100 according to the difference. To do.

  As described above, in this embodiment, the output rotary shaft is rotatably supported by the first bearing provided on the body, and the output rotary shaft is rotatably supported by the second bearing provided on the cover. The position sensor is attached to the output shaft of the motor. Therefore, since the position sensor is attached to the output shaft of the motor, the rotation angle of the motor output shaft is detected, and the output rotation shaft of the actuator is controlled, the vibration of the output shaft of the actuator is not transmitted to the position sensor. , Reliability can be improved. In addition, since the two bearings are structured to be attached to the body and the cover, the span of the two bearings can be the longest. Therefore, it is possible to minimize the runout of the output rotation shaft, to minimize fretting wear, and to improve reliability.

  In the present embodiment, the cover is provided with a power feeding connector to the motor, and the cover is provided with a bearing for supporting one end of the output rotation shaft. Therefore, the cover can serve as the connector and the bearing. .

Further, since the cover is formed with a connection terminal that is plugged and connected to a power supply terminal formed on the motor, the mounting of the cover achieves the support of the output rotating shaft and the electrical connection to the motor. be able to.
Further, a motor control circuit is formed on the cover, a bearing for supporting one end of the output rotating shaft is provided on the cover, and a partition for separating the bearing and the control circuit is formed on the cover. Thus, the control circuit attached to the cover can be protected from contamination by the lubricant in the bearing portion of the output rotating shaft.

  In addition, since the position sensor is provided coaxially with the output shaft of the motor, the rotation angle of the turbine is not easily affected by disturbance (temperature, vibration) and can be accurately detected, and the angle of the movable blade of the turbocharger can be detected. It can be controlled accurately.

  In addition, since the output rotating shaft is provided with the first and second bearings that rotatably support both ends, it is possible to minimize the deflection of the output rotating shaft and minimize fretting wear. It is possible to suppress the reliability and improve the reliability.

In addition, the first and second bearings for rotating and supporting the output rotation shaft at both ends are provided, and the angle of the movable blade of the turbocharger is controlled based on the output of the position sensor of the electronic control actuator. The reliability of the turbocharger integrated with the control actuator can be improved.

It is a perspective view of the state where the cover which shows the composition of the electronically controlled actuator by one embodiment of the present invention was removed. It is an external appearance perspective view which shows the structure of the electronically controlled actuator by one Embodiment of this invention. It is a perspective view inside a cover used for the electronically controlled actuator by one Embodiment of this invention. 1 is a cross-sectional view of an electronically controlled actuator according to an embodiment of the present invention. 1 is a perspective view showing an overall configuration of a variable capacity turbocharger equipped with an electronic control actuator according to an embodiment of the present invention. FIG. 3 is an exploded front view showing a vane link arrangement in a turbine housing of a variable capacity turbocharger to which an electronic control actuator according to an embodiment of the present invention is attached. FIG. 3 is a layout view of movable blades in a variable capacity turbocharger equipped with an electronic control actuator according to an embodiment of the present invention. It is XX sectional drawing of FIG. 1 is a system configuration diagram showing a configuration of a variable capacity turbocharger system equipped with an electronic control actuator according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Electronic control actuator 110 ... Body 120 ... Cover 126 ... Bearing holding part 130 ... Motor 140 ... Transmission mechanism 141 ... Pinion gear 142 ... Gear 143 ... Worm gear 145 ... Output shaft rotating shaft 146A, 146B ... Ball bearing 150 ... Position sensor 151 , 152 ... Magnet plate 153, 154 ... Hall IC
DESCRIPTION OF SYMBOLS 160 ... Control circuit 200 ... Variable capacity turbocharger 210 ... Turbine housing 220 ... Compressor housing 230 ... Movable blade 232 ... Drive link 234 ... Ring 236 ... Vane link 292 ... Movable link 294 ... Rod

Claims (14)

A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
A first bearing provided on the cover and rotatably supporting the output rotation shaft;
A second bearing provided on the body and rotatably supporting the output rotation shaft;
An electronic control actuator, wherein the position sensor is attached to an output shaft of the motor. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
The cover is formed with a power connector to the motor,
The cover is provided with a bearing for supporting one end of the output rotation shaft,
An electronically controlled actuator, wherein the driven member is a turbocharger. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
The cover is formed with a connection terminal that is plugged and connected to a power supply terminal formed on the motor,
The cover is provided with a bearing for supporting one end of the output rotation shaft,
An electronically controlled actuator, wherein the driven member is a turbocharger. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
A control circuit for the motor is formed on the cover,
The cover is provided with a bearing for supporting one end of the output rotation shaft,
The cover is formed with a partition that separates the bearing and the control circuit,
An electronically controlled actuator, wherein the driven member is a turbocharger. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
The position sensor is provided on the same axis as the output shaft of the motor,
An electronically controlled actuator, wherein the driven member is a turbocharger and controls an angle of a movable blade of the turbocharger based on an output of the position sensor. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and the driving force of the motor is taken out from the output rotation shaft via the speed change mechanism, and the driven member is In an electronically controlled actuator that rotates,
The output rotation shaft includes first and second bearings that rotatably support both ends,
An electronically controlled actuator, wherein the driven member is a turbocharger and controls an angle of a movable blade of the turbocharger based on an output of the position sensor. A motor, a speed change mechanism, and a position sensor are incorporated in a case composed of a body and a cover, and an electronic control actuator for taking out the driving force of the motor from the output rotating shaft through the speed change mechanism and a movable blade In an electronic control actuator integrated turbocharger integrated with a turbocharger having
The output rotation shaft includes first and second bearings that rotatably support both ends,
An electronically controlled actuator-integrated turbocharger that controls an angle of a movable blade of the turbocharger based on an output of the position sensor of the electronically controlled actuator. The rotation of the motor is transmitted to the output rotation shaft via a gear, and the output rotation shaft is driven to rotate. The motor is attached to a body on which a bearing for supporting one end of the output rotation shaft is formed, and the body In the electric actuator covering the motor, the gear and the other end of the output shaft with a resin cover fixed to
A power supply connector to the motor is formed on the outer surface portion of the cover, and an electric terminal that is electrically connected to the connector and electrically connected to the connector is formed on the inner surface of the cover. An electric actuator characterized in that an outer ring of a bearing having an inner ring fixed to the other end of the output rotating shaft is fixed. The rotation of the motor is transmitted to the output rotation shaft via a gear, and the output rotation shaft is driven to rotate. The motor is attached to a body on which a bearing for supporting one end of the output rotation shaft is formed, and the body In the electric actuator covering the motor, the gear and the other end of the output shaft with a resin cover fixed to
The resin cover is molded with an electric terminal into which the power feeding terminal of the motor is inserted and connected, and further provided with a bearing holding portion for holding an outer ring of a bearing having the inner ring fixed to the other end of the output rotation shaft. An electric actuator characterized by that. The rotation of the motor is transmitted to the output rotation shaft via a gear, and the output rotation shaft is driven to rotate. The motor is attached to a body on which a bearing for supporting one end of the output rotation shaft is formed, and the body In the electric actuator covering the motor, the gear and the other end of the output shaft with a resin cover fixed to
The motor control circuit is attached to the inner surface of the resin cover and electrically connected to a connector formed on the outer surface of the resin cover. Further, the resin cover has an inner ring at the other end of the output rotation shaft. An electric actuator characterized by holding an outer ring of a fixed bearing and attaching a partition for isolating the bearing portion and the control circuit to the cover. In the movable blade type turbine in which the angle of the movable blade is controlled by the output rotation shaft that is rotationally driven by the motor,
A movable blade type turbine characterized in that a magnetic encoder is provided on an output shaft of the motor, and an angle of the movable blade is physically controlled as a function of an output pulse of the magnetic encoder. A movable blade type turbine in which the angle of the movable blade is controlled by an output rotation shaft that is rotationally driven by a motor,
The rotation of the motor is transmitted to the output rotation shaft via a gear to rotate the output rotation shaft, and the motor is attached to a body on which a bearing for supporting one end of the output rotation shaft is formed, and the body In the movable blade type turbine covering the other end of the motor, gear and output shaft with a resin cover fixed to
A magnetic encoder is provided on the output shaft of the motor, the motor control circuit is attached to the inner surface of the resin cover facing the magnetic encoder, and electrically connected to a connector formed on the outer surface of the resin cover. A movable blade type turbine characterized in that a magnetoelectric conversion element for detecting a magnetic flux change of the magnetic encoder is attached to the control circuit. The movable blade turbine according to claim 12,
A movable blade type turbine characterized in that a partition wall for partitioning the magnetoelectric conversion element and the encoder is attached to the resin cover. The movable blade turbine according to claim 12,
A movable blade type turbine characterized in that a bearing mounting portion that pivotally supports an electric terminal of the motor and the other end of the output rotating shaft across the control circuit is provided on an inner surface portion of the resin cover.

Images