WO2018181119A1 - Actionneur électrique et procédé de fabrication d'actionneur électrique - Google Patents

Actionneur électrique et procédé de fabrication d'actionneur électrique Download PDF

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Publication number
WO2018181119A1
WO2018181119A1 PCT/JP2018/012019 JP2018012019W WO2018181119A1 WO 2018181119 A1 WO2018181119 A1 WO 2018181119A1 JP 2018012019 W JP2018012019 W JP 2018012019W WO 2018181119 A1 WO2018181119 A1 WO 2018181119A1
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WO
WIPO (PCT)
Prior art keywords
case
motor
electric actuator
motor terminal
insertion portion
Prior art date
Application number
PCT/JP2018/012019
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English (en)
Japanese (ja)
Inventor
辰徳 清水
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Ntn株式会社
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Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2018181119A1 publication Critical patent/WO2018181119A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive

Definitions

  • the present invention relates to an electric actuator and a method for manufacturing the electric actuator.
  • Patent Document 1 in a linear motion type electric actuator that employs a ball screw as a motion conversion mechanism, there is a configuration in which an opening through which the wiring is passed is provided in the housing in order to connect the wiring of the motor to the drive circuit. It is disclosed.
  • Patent Document 1 has a problem that the number of assembling steps increases because it is necessary to take out the wiring through the opening of the housing in the assembly process of the electric actuator.
  • foreign matter such as dust and water may enter the housing from the gap between the opening and the wiring, and in order to prevent this, a process for sealing the gap between the opening and the wiring is required.
  • the cost increased.
  • an object of the present invention is to provide an electric actuator that can easily connect the conductive member to the electric motor and that does not require a sealing process between the conductive member and the case.
  • the present invention includes a drive unit having an electric motor and a motion conversion mechanism unit that converts the rotational motion of the drive unit into linear motion, and the motion conversion mechanism unit is driven.
  • a motor-driven actuator having a nut that rotates in response to the rotational movement of a portion, and a screw shaft that is arranged on the inner periphery of the nut and moves linearly as the nut rotates
  • a conductive member formed integrally with the case The conductive member has an insertion portion, and the motor terminal of the electric motor is inserted into the insertion portion and connected to be conductive.
  • the motor terminals can be connected to each other only by inserting the motor terminals into the insertion portion, the connection work between the conductive member and the motor terminals can be easily performed. Further, since the conductive member is formed integrally with the case, it is not necessary to separately perform a work of attaching the conductive member to the case, and the number of assembling steps can be reduced. In addition, by forming the conductive member integrally with the case, it is possible to prevent the occurrence of a gap between the conductive member and the case, as in the case where they are formed separately, so a sealing process for closing the gap is performed separately. Even without it, it is possible to prevent foreign matter from entering the case.
  • the insertion portion has a bottom portion that contacts the first surface of the motor terminal, and a pair of pressing portions that rise from the bottom portion in a direction crossing the bottom portion and that contact the second surface opposite to the first surface of the motor terminal. Therefore, the motor terminal can be held between the bottom portion and the pressing portion.
  • the fitting direction of the electric motor with respect to a motor fitting part and the insertion direction of the motor terminal with respect to an insertion part are made into the same direction.
  • the fitting operation and the inserting operation can be performed by a series of operations, and workability is improved.
  • the present invention includes a drive unit having an electric motor, and a motion conversion mechanism unit that converts the rotational motion of the drive unit into a linear motion, and the motion conversion mechanism unit rotates the drive unit.
  • a conductive member having an insertion portion is formed integrally with the case. The motor terminal of the electric motor is inserted into the insertion portion and connected to be conductive.
  • the motor terminals can be connected so as to be conductive only by inserting the motor terminals into the insertion portion, the connection work between the conductive member and the motor terminals becomes easy.
  • the conductive member is formed integrally with the case, the mounting work of the conductive member becomes unnecessary, the number of assembling steps can be reduced, and the occurrence of a gap between the conductive member and the case can be prevented. Intrusion of foreign matter into the case can be prevented without performing a sealing process to close the gap.
  • the motor terminal when inserting the motor terminal into the insertion part, by plastically deforming the insertion part, the motor terminal can be soldered to the conductive member, or the conductive member can be crimped to the motor terminal without being crimped. An insertion part and a motor terminal can be stuck. Thereby, the motor terminal and the conductive member are more firmly connected, and the connection strength against vibration and the like is improved.
  • the conductive member and the case can be integrally formed by insert-molding the conductive member into the case.
  • the present invention it is possible to easily connect the conductive member to the electric motor.
  • the manufacturing cost can be reduced.
  • FIG. 2 is a partially exploded perspective view of the electric actuator shown in FIG. 1.
  • FIG. 2 is a partially exploded perspective view of the electric actuator shown in FIG. 1.
  • FIG. 2 is a partially exploded perspective view of the electric actuator shown in FIG. 1.
  • It is a disassembled perspective view of the screw shaft in the state where the permanent magnet was attached.
  • It is a perspective view of the 2nd case and a bus bar.
  • It is sectional drawing of the insertion part before a motor terminal is inserted.
  • It is an enlarged view of a motor terminal.
  • It is an enlarged view of a motor terminal.
  • It is a figure which shows the state by which the bus-bar and the motor terminal were connected.
  • It is CC sectional view taken on the line of FIG.
  • FIG. 11 is a cross-sectional view taken along line DD in FIG. 10.
  • FIG. 1 is a longitudinal sectional view of an electric actuator according to a first embodiment of the present invention
  • FIG. 2 is an exploded perspective view of the electric actuator according to the first embodiment.
  • the electric actuator 1 includes a drive unit 2, a motion conversion mechanism unit 3 that converts a rotational motion of the drive unit 2 into a linear motion, and a linear motion of the motion conversion mechanism unit 3. And an operation unit 6 for operating an operation target not shown.
  • the drive unit 2 of the present embodiment has an electric motor 7.
  • the “axial direction” referred to below is a direction along the rotation center X of the electric motor 7 shown in FIG.
  • the side on which the drive unit 2 is disposed (the right side in FIG. 1) and the side on which the operation unit 6 is disposed (the left side in FIG. 1).
  • the side on which the drive unit 2 is disposed the right side in FIG. 1
  • the side on which the operation unit 6 is disposed (the left side in FIG. 1).
  • each of the drive unit 2 and the motion conversion mechanism unit 3 has a member constituting a housing 1 ⁇ / b> A of the electric actuator 1.
  • the drive unit 2 is provided with a first case 9 that houses the electric motor 7 and a pair of bus bars 19 as conductive members that electrically connect a power source (not shown) and the electric motor 7.
  • the motion conversion mechanism unit 3 includes a second case 10 and a third case 11 that houses a ball screw 12 as a motion conversion mechanism.
  • the housing 1A is completed by connecting and integrating the cases 9 to 11 arranged in a row in the axial direction using the bolt members 27 shown in FIG.
  • the flange portion 16 of the first case 9 and the flange portion 25 of the second case 10 and the flange portion 25 of the second case 10 and the flange portion 26 of the third case 11 are used. O-rings 28 and 29 are interposed between the two.
  • the driving unit 2 includes an electric motor 7 that generates a driving force (rotational driving force), a first case 9 that houses the electric motor 7, a bus bar 19, and a second case 10 in which the bus bar 19 is provided.
  • the first case 9 integrally includes a bottomed cylindrical case main body 15 and a flange portion 16 provided with an insertion hole for the bolt member 27 shown in FIG.
  • the inner peripheral surface 15a of the case body 15 is gradually reduced in diameter from the other side in the axial direction (opening side of the case body 15) toward one side in the axial direction (bottom side of the case body 15).
  • the outer periphery of the end on one side in the direction is in contact with the end on the one side in the axial direction of the inner peripheral surface 15a of the case main body 15 in a state avoiding contact with the surface.
  • the electric motor 7 has the protrusion part 7a fitted to the inner periphery of the motor fitting part 17 of the 2nd case 10 mentioned later. Therefore, the electric motor 7 is supported by the case main body 15 of the first case 9 and the motor fitting portion 17 of the second case 10.
  • An O-ring 18 is interposed between the electric motor 7 and the inner bottom surface 15b of the case body 15 to prevent the electric motor 7 from rattling in the axial direction and external leakage of lubricant such as grease. .
  • the second case 10 has a cylindrical case body 23, a cylindrical fitting portion 24 fitted to the inner periphery of the third case 11, and a protrusion 7a of the electric motor 7 fitted to the inner periphery.
  • An annular motor fitting portion 17 and a flange portion 25 provided with an insertion hole for the bolt member 27 shown in FIG. 2 are integrally provided. Since the second case 10 integrally includes the fitting portion 24 and the motor fitting portion 17, the centering between the first case 9 and the third case 11 can be easily performed.
  • the rotation center X and the rotation center of the nut 30 of the ball screw 12 described later can be easily matched.
  • a pair of bus bars 19 is provided on the case body 23 of the second case 10.
  • One end 19a of each bus bar 19 protrudes in the axial direction from the case body 23 and is exposed to the outside, and the other end 19b protrudes in the radial direction from the case body 23 and is exposed to the outside.
  • One end portion 19a protruding in the axial direction of each bus bar 19 is formed in a substantially cylindrical shape, and a pair of motor terminals 7c provided on the electric motor 7 is a shaft with respect to the one end portion 19a formed in the substantially cylindrical shape.
  • the motor terminal 7c and each bus bar 19 are connected to each other by being inserted in the direction. Further, the other end 19b protruding in the radial direction of each bus bar 19 is connected to a power source (not shown).
  • the motion conversion mechanism unit 3 includes a ball screw 12 and a third case 11 in which the ball screw 12 is accommodated.
  • the ball screw 12 includes a screw shaft 31 disposed coaxially (in series) with the output shaft 7 b of the electric motor 7, a nut 30 rotatably fitted to the outer periphery of the screw shaft 31 via a large number of balls 32, A top 33 as a circulation member is provided.
  • a large number of balls 32 are filled between a spiral groove 30 a formed on the inner peripheral surface of the nut 30 and a spiral groove 31 a formed on the outer peripheral surface of the screw shaft 31, and a top 33 is incorporated.
  • the output shaft 7 b of the electric motor 7 is provided with a coupling 62 so as to be rotatable integrally with the output shaft 7 b, and the electric motor 7 and the nut 30 of the ball screw 12 are connected via the coupling 62.
  • the coupling 62 has a flat surface 62a on the outer periphery, and is fitted and fixed to the inner peripheral surface 30b (see FIG. 1) on the other axial end side of the nut 30 by fitting or the like. .
  • the rotational driving force of the electric motor 7 is transmitted to the nut 30 via the coupling 62, and the nut 30 rotates in either the forward or reverse direction.
  • the rotation of the screw shaft 31 is restricted by a detent described later.
  • the screw shaft 31 moves forward and backward in the axial direction according to the rotational direction of the nut 30.
  • the end of the screw shaft 31 on the other side in the axial direction functions as an operation unit (actuator head) 6 that operates an operation target (not shown). Therefore, the operation target is operated in the axial direction as the screw shaft 31 moves back and forth in the axial direction.
  • the third case 11 includes a large diameter cylindrical portion 35, a small diameter cylindrical portion 36 located on the other axial side of the large diameter cylindrical portion 35, and an annular flange portion provided with an insertion hole for the bolt member 27 shown in FIG. 26 integrally.
  • An inner peripheral surface 37 of the large-diameter cylindrical portion 35 is formed in a cylindrical surface having a constant diameter, and the nut 30 is rotatably supported on the inner peripheral surface 37 with respect to the housing 1A (third case 11).
  • Bearings (ball bearings) 13 and 14 are attached and fixed apart in the axial direction.
  • the third case 11 has a metallic cylindrical member 38 disposed on the inner periphery of the large-diameter cylindrical portion 35, and the inner peripheral surface 37 to which the bearings 13 and 14 (outer rings) are attached and fixed is as follows. It is comprised by the internal peripheral surface of the cylindrical member 38. FIG. An annular portion 39 extending inward in the radial direction is integrally provided at the other axial end of the tubular member 38, and the annular portion 39 and the bearing 13 are opposed to each other in the axial direction. A wave washer 42, which is an annular elastic member that has been compressed and deformed, and an annular spacer washer 43 are interposed. Further, the bearing 14 positioned on one side in the axial direction is urged toward the other side in the axial direction by the fitting portion 24 of the second case 10. With the above configuration, axial preload is applied to the bearings 13 and 14 formed of rolling bearings.
  • a cylindrical slide bearing 40 formed of sintered metal and having a screw shaft 31 inserted in the inner periphery is provided on the inner periphery of the small-diameter cylindrical portion 36 constituting the third case 11. ing.
  • a sliding surface 34 on which the screw shaft 31 can slide is provided on the inner peripheral surface of the slide bearing 40.
  • the internal pores of the sliding bearing 40 made of a sintered metal porous body are preferably impregnated with a lubricant such as grease or lubricating oil. In this way, an oil film can be formed between the inner peripheral surface (sliding surface 34) of the slide bearing 40 and the outer peripheral surface of the screw shaft 31, so that the screw shaft 31 can be smoothly linearly moved. it can.
  • a retaining ring 41 for positioning the slide bearing 40 in the axial direction is fixed at a predetermined position in the axial direction of the screw shaft 31.
  • the inner peripheral surface (sliding surface 34) of the slide bearing 40 is provided with a function to prevent the screw shaft 31 from rotating. More specifically, as shown in FIG. 4, the sliding surface 34 includes one flat surface 34 a provided in a partial region in the circumferential direction and an arc surface (partial cylindrical surface) 34 b. On the other hand, in the sliding region 31b that slides with the sliding surface 34 of the outer peripheral surface of the screw shaft 31, a flat surface portion 31b1 that faces the flat surface 34a of the sliding surface 34 and a partial cylinder that faces the partial cylindrical surface 34b. A surface portion 31b2 is provided.
  • the third case 11 of the present embodiment having the above-described configuration is a resin injection molded product using the cylindrical member 38 and the slide bearing 40 as insert parts.
  • the third case 11 is provided with a hole 11a so as to follow the outer peripheral surface of the positioning pin in which the cylindrical member 38 is positioned in the mold in the axial direction.
  • the metal cylindrical member 38, and the sintered metal slide bearing 40 may be fixed by appropriate means.
  • a boot 44 is installed between the small diameter cylindrical portion 36 of the third case 11 and the screw shaft 31 to prevent foreign matter from entering the third case 11.
  • the boot 44 is made of resin or rubber, and integrally includes a large-diameter cylindrical portion 44a and a small-diameter cylindrical portion 44b, and a bellows portion 44c interposed between the cylindrical portions 44a and 44b.
  • the large-diameter cylindrical portion 44a and the small-diameter cylindrical portion 44b of the boot 44 are fastened and fixed to the outer peripheral surface of the small-diameter cylindrical portion 36 of the third case 11 and the outer peripheral surface of the screw shaft 31 by using boot bands 45 and 46, respectively.
  • a boot cover 47 covering the boot 44 is disposed on the outer periphery of the boot 44, and the boot cover 47 is attached to, for example, the third case 11 adjacent in the axial direction.
  • the electric actuator 1 is provided with a position detection device for detecting the axial position (the amount of movement in the axial direction) of the screw shaft 31.
  • the position detection device includes a permanent magnet 53 as a sensor target provided on the screw shaft 31 and a magnetic sensor 54 as a position detection sensor provided on the boot cover 47.
  • the magnetic sensor 54 any type can be used, and among them, a type capable of detecting the direction and magnitude of the magnetic field using the Hall effect, such as Hall IC and linear Hall IC, can be preferably used.
  • the magnetic sensor 54 is formed integrally with a sensor substrate 55, and the sensor substrate 55 is fixed to a sensor case 57 by a connecting member 56. Then, by attaching a sensor assembly 58 in which the sensor substrate 55 is attached to the sensor case 57 to a sensor attachment portion 47 a provided at a predetermined position in the circumferential direction of the boot cover 47, the magnetic sensor 54 is arranged in the circumferential direction of the boot cover 47. While being installed at a predetermined position, it is in a state of facing the permanent magnet 53 through the boot 44 and the boot cover 47. In this case, the magnetic sensor 54 is covered with the boot cover 47 and the sensor case 57 as shown in FIG.
  • the sensor case 57 and the boot cover 47 that cover the periphery of the magnetic sensor 54 are both formed of a nonmagnetic material such as a resin material.
  • FIG. 5 shows an exploded perspective view of the sensor target unit 59 including the permanent magnet 53 and the screw shaft 31. As shown in FIG. 5, a notch 31c is formed at a predetermined position in the axial direction of the screw shaft 31, and a sensor target unit 59 is attached to the notch 31c.
  • the sensor target unit 59 includes a permanent magnet 53 and first and second magnet holders 60 and 61 that hold the permanent magnet 53.
  • the first magnet holder 60 is formed in a substantially arc shape as a whole, and has a fitting claw 60 a fitted in the notch 31 c of the screw shaft 31 and a housing portion 60 b that can house the permanent magnet 53.
  • the housing part 60 b has an end on the other axial side opening in the end face on the other axial side of the first magnet holder 60. Then, the permanent magnet 53 is inserted into the accommodating portion 60b of the magnet holder 60 from the opening side, and then the second magnet holder 61 formed in an arc shape so as to close the opening is attached to the screw shaft 31. It is positioned in the axial direction by fitting into the notch 31c.
  • the material of the first and second magnet holders 60 and 61 is basically arbitrary.
  • each of the magnet holders 60 and 61 is preferably made of a non-magnetic material, and the attachment property (fit) of the magnet holders 60 and 61 to the screw shaft 31 is good.
  • resin In consideration of the elastic deformability of the joint claw 60a, it is preferable to use resin.
  • the position detection device is configured as described above, when the screw shaft 31 moves back and forth in the axial direction, the relative position of the permanent magnet 53 in the axial direction with respect to the magnetic sensor 54 changes.
  • the magnetic field at the location also changes.
  • the magnetic sensor 54 detects a change in the magnetic field (for example, the direction and strength of the magnetic flux density), and acquires the axial position of the permanent magnet 53 and, in turn, the axial position of the screw shaft 31 (operation unit 6).
  • the pair of bus bars 19 is configured by bending a band-shaped member made of a metal material such as brass or copper into a predetermined shape, which is formed with respect to the second case 10 made of resin. It is integrally formed with the second case 10 by insert molding.
  • Each bus bar 19 is embedded in the case main body 23 of the second case 10, and extends in the radial direction of the case main body 23 from a circumferential extending portion 191 that extends in the circumferential direction of the case main body 23 and one end portion of the circumferential extending portion 191.
  • a portion on the front end side of the radially extending portion 192 (a portion exposed outside the case main body 23) is a portion connected to a power source (not shown).
  • the portion on the tip side of the axially extending portion 193 (the portion exposed to the outside of the case body 23) is a portion connected to the motor terminal, and here, a substantially cylindrical shape into which the motor terminal is inserted.
  • An insertion portion 194 is provided.
  • the insertion part 194 includes a bottom part 194a and a pair of pressing parts 194b that rise from the bottom part 194a in a direction crossing the bottom part 194a.
  • the pair of pressing portions 194b are provided with a gap G (see FIG. 7) therebetween in the width direction of the bottom portion 194a.
  • the front end side of each pressing portion 194b is bent in an arc shape or a curved shape so as to approach each other, and these front end portions are spaced H in the height direction with respect to the bottom portion 194a (see FIG. 7). It is arranged so as to face each other with a gap.
  • the pair of pressing portions 194b are provided with a gap G in the width direction, and the tip portions of the pressing portions 194b are arranged with a gap H in the height direction with respect to the bottom portion 194a.
  • an insertion space J into which the motor terminal is inserted is formed inside the insertion portion 194.
  • the gap G in the width direction and the gap H in the height direction of the insertion space J are set as follows with respect to the width dimension and thickness dimension of the motor terminal.
  • the gap G in the width direction of the insertion space J is set larger than the width dimension W of the motor terminal 7c shown in FIG.
  • the interval H in the height direction of the insertion space J is formed smaller than the thickness dimension T1 of the motor terminal 7c shown in FIG.
  • the motor terminal 7c is provided with a convex portion 7e protruding in the thickness direction, and the thickness of the insertion portion J is larger than the thickness T2 of the portion where the convex portion 7e is provided.
  • the interval H in the height direction is set small.
  • the interval H in the height direction of the insertion space J is set to be smaller than the thickness dimensions T1 and T2 of each part of the motor terminal 7c.
  • FIG. 11 is a cross-sectional view taken along the line CC of FIG. 10 where the insertion portion 194 is cut at a location where the convex portion 7e of the motor terminal 7c is not provided.
  • the insertion portion 194 is expanded in the thickness direction at the portion where the convex portion 7e of the motor terminal 7c is provided.
  • the convex portion 7e bites into the bottom portion 194a of the insertion portion 194
  • the bottom portion 194a is plastically deformed, and a concave portion 194c is formed in the bottom portion 194a.
  • the insertion portion 194 of the bus bar 19 is plastically deformed by the insertion of the motor terminal 7c, whereby the insertion portion 194 and the motor terminal 7c can be brought into close contact with each other. 19 and the electric motor 7 can be reliably connected so as to be conductive.
  • the motor terminal 7c is held by being inserted by the insertion portion 194. That is, in the connected state, the bottom portion 194a of the insertion portion 194 is in contact with one surface (first surface) in the thickness direction of the motor terminal 7c, and a pair with respect to the opposite surface (second surface). Therefore, the motor terminal 7c is held between the bottom portion 194a and the pressing portion 194b. Thereby, the motor terminal 7c and the bus bar 19 are firmly connected, and the connection strength against vibration and the like is improved.
  • the convex portion 7e of the motor terminal 7c bites into the bottom portion 194a of the insertion portion 194, whereby the adhesion between the motor terminal 7c and the bus bar 19 is further improved.
  • the convex portion 7e of the motor terminal 7c and the concave portion 194c provided on the bottom portion 194a are engaged, it is possible to suppress a deviation between the motor terminal 7c and the insertion portion 194 due to vibration and the like. A stable connection state can be maintained over a long period of time.
  • the bus bar 19 is formed integrally with the second case 10, so that the mounting work of the bus bar 19 with respect to the second case 10 does not have to be performed separately, and the assembly man-hour is reduced. Can be reduced. Further, since the bus bar 19 is formed integrally with the second case 10, it is possible to prevent the occurrence of a gap between the bus bar and the case as in the case where they are formed separately. Accordingly, it is possible to prevent foreign matter from entering the case without separately performing a sealing process for closing the gap, so that the manufacturing cost can be reduced.
  • the fitting direction of the electric motor 7 with respect to the motor fitting portion 17 of the second case 10 and the insertion direction of the motor terminal 7c with respect to the insertion portion 194 are the same direction (axial direction). It is configured. Therefore, when the electric motor 7 is fitted to the motor fitting portion 17, the motor terminal 7c can be inserted into the insertion portion 194, and the fitting operation and the insertion operation can be performed by a series of operations. , Workability is improved.
  • the electric actuator according to the present invention is not limited to the above-described embodiment.
  • the insertion portion is not limited to plastic deformation due to insertion of a motor terminal, and may be elastically deformed. Also in this case, the elastically deformed insertion portion is brought into close contact with the motor terminal, so that they can be connected in a conductive manner.
  • connection structure and the connection method of the conductive member for power supply have been described.
  • connection structure and the connection method are not limited to the conductive member for power supply,
  • the present invention can also be applied to a control signal conductive member used to send a signal to and from an electric motor.
  • the electric actuator according to the present invention may include a speed reducer that decelerates and transmits a driving force (rotation) from the electric motor to the ball screw.
  • a speed reducer for example, a planetary gear speed reducer, a traction drive type planetary speed reducer (planet roller speed reducer), or other various speed reducers can be employed.
  • the ball screw 12 is employed as the motion conversion mechanism unit 3, but instead of the ball screw 12, a so-called slide screw in which a nut is assembled to the screw shaft without using a ball is used. It may be adopted.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Transmission Devices (AREA)
  • Motor Or Generator Frames (AREA)
  • Braking Systems And Boosters (AREA)
  • Power Steering Mechanism (AREA)
  • Braking Arrangements (AREA)

Abstract

La présente invention concerne un actionneur électrique pourvu d'une unité d'entraînement ayant un moteur électrique 7 et une unité de mécanisme de conversion de mouvement pour convertir le mouvement de rotation de l'unité d'entraînement en un mouvement linéaire, ladite unité de mécanisme de conversion de mouvement ayant : un écrou tournant en réponse au mouvement de rotation de l'unité d'entraînement ; et un arbre à vis disposé dans la circonférence interne de l'écrou et effectuant un mouvement linéaire en association avec la rotation de l'écrou. L'actionneur électrique est pourvu d'un boîtier 10 et d'un élément conducteur 19 formé d'un seul tenant avec le boîtier 10, ledit élément conducteur 19 ayant une partie d'insertion 194 ; et une borne de moteur 7c du moteur électrique 7 est insérée dans la partie d'insertion 194 et reliée à celle-ci de manière conductrice.
PCT/JP2018/012019 2017-03-29 2018-03-26 Actionneur électrique et procédé de fabrication d'actionneur électrique WO2018181119A1 (fr)

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US11804751B2 (en) * 2018-06-29 2023-10-31 Ntn Corporation Electric actuator including a holder that holds a conductive member and an elastic member that is interposed and held between the holder and a case
CN114483836A (zh) * 2021-12-28 2022-05-13 中国航天空气动力技术研究院 一种电动刹车装置双余度作动器布局

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