WO2017203944A1 - Actionneur électrique - Google Patents

Actionneur électrique Download PDF

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Publication number
WO2017203944A1
WO2017203944A1 PCT/JP2017/017157 JP2017017157W WO2017203944A1 WO 2017203944 A1 WO2017203944 A1 WO 2017203944A1 JP 2017017157 W JP2017017157 W JP 2017017157W WO 2017203944 A1 WO2017203944 A1 WO 2017203944A1
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WO
WIPO (PCT)
Prior art keywords
axial direction
electric actuator
output member
screw shaft
rotor
Prior art date
Application number
PCT/JP2017/017157
Other languages
English (en)
Japanese (ja)
Inventor
卓志 松任
池田　良則
悠紀 内藤
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017203944A1 publication Critical patent/WO2017203944A1/fr

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Classifications

    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • 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
    • 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
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • 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

Definitions

  • the present invention relates to an electric actuator.
  • the origin position of the output member is usually set in order to accurately manage and control the axial displacement amount of the screw shaft (output member).
  • the position where the output member and the bottom of the casing abut in the axial direction can be set as the origin of the output member. . That is, when a bottomed cylindrical casing is used, the bottom of the casing can be used as an origin positioning unit for determining the origin position of the output member.
  • FIG. 13 is a partial enlarged cross-sectional view showing a main part of a conventional electric actuator.
  • This electric actuator is arranged coaxially with the rotation center of a motor (not shown), has a hollow screw shaft 101 provided with a spiral groove 101a on the outer peripheral surface, and is arranged on the outer periphery of the screw shaft 101, and on the inner peripheral surface.
  • a ball screw device 104 including a nut member 102 provided with a spiral groove 102a and a plurality of balls 103 interposed between the spiral grooves 101a and 102a in a rollable manner constitutes a motion conversion mechanism.
  • the output member 100 is constituted by a screw shaft 101 and an inner member 105 which is fixed to the inner periphery of the screw shaft 101 and has an operation portion capable of operating an operation target in the axial direction.
  • the ball screw device 104 and a motor are provided with an opening 111 at one end in the axial direction (right side in the figure) and a disk-shaped bottom 112 at the other end in the axial direction (left side in the figure). It is accommodated in a provided bottomed cylindrical casing 110.
  • the output member 100 when some trouble occurs in the electric system of the electric actuator, the output member 100 overruns with the return of the origin of the output member 100, and the output member 100 and the bottom portion 112 of the housing 110 strongly collide with each other. In this case, the output member 100 is bent such that its axis X ′ is displaced from the rotation center X of the motor (see FIGS. 13 and 14B). In this case, since the ball 103 is in contact with the spiral groove 101a of the screw shaft 101 even at a contact point 101c other than the predetermined contact point 101b, the contact state between the screw shaft 101 and the nut member 102 and the ball 103 is a three-point contact.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide an electric actuator in which a ball screw device is adopted as a motion conversion mechanism, and the output member is operated as the output member returns to the origin.
  • a ball screw device is adopted as a motion conversion mechanism, and the output member is operated as the output member returns to the origin.
  • the present invention which has been devised to solve the above problems, includes a motor unit that is driven by receiving power supply, a motion conversion mechanism unit that converts the rotational motion of the motor unit into a linear motion, and outputs the motor unit, And a bottomed cylindrical housing having an opening at one end in the axial direction and a bottom at the other end in the axial direction.
  • a screw shaft that is arranged coaxially with the rotation center of the rotor of the part, and a nut member that is rotatably fitted to the outer periphery of the screw shaft via a plurality of balls and is provided so as to be able to transmit torque.
  • the opening end surface of the housing and the output member facing the same Between the end face on the other side in the axial direction Origin positioning annular member which determines the position of the origin of the output member is provided by engagement with both the axial direction, the raw point positioning member and having an elastic restoring force in the axial direction.
  • the “output member” in the present invention is an output member of an electric actuator.
  • the origin positioning member as described above is provided, the origin position of the output member can be set easily and accurately without using the bottom of the housing.
  • the origin positioning member has an elastic restoring force in the axial direction (elastic restoring force against the compressive load in the axial direction)
  • the origin return of the output member is performed.
  • the origin positioning member is sandwiched between the opening end surface of the housing and the end surface on the other side in the axial direction of the output member facing this.
  • the elastic restoring force in the axial direction is generated by crushing. Accordingly, it is possible to effectively reduce the possibility that the output member and the bottom portion of the housing will abut against each other, and in turn, the possibility that the ball constituting the ball screw device will fall into a locked state where it cannot roll.
  • the inner end surface of the bottom portion of the housing is opposed to the end surface of the output member via an axial gap. This is advantageous in reducing the possibility that the ball screw device falls into the locked state as the output member returns to the origin.
  • the origin positioning member is made of an elastic material such as a rubber material, a resin material, or a thermoplastic elastomer, the origin positioning member having a predetermined shape can be easily manufactured, so that an increase in cost due to the provision of the origin positioning member is suppressed. This is advantageous.
  • the rotor of the motor unit may have a hollow rotating shaft that is rotatably supported by rolling bearings that are arranged at two locations that are spaced apart in the axial direction, with a nut member arranged on the inner periphery.
  • the hollow rotary shaft may be provided with an inner raceway surface of one of the two rolling bearings. In this way, the hollow rotating shaft and thus the housing can be made compact in the axial direction. Thereby, it is possible to realize an electric actuator that is compact in the axial direction and excellent in mountability to a device used.
  • the electric actuator can be made more compact in the axial direction by arranging the inner raceway surface inside the axial width of the nut member.
  • the motion conversion mechanism may have a speed reducer that decelerates the rotation of the rotor and transmits it to the nut member.
  • a speed reducer that decelerates the rotation of the rotor and transmits it to the nut member.
  • a planetary gear speed reducer can be adopted as the speed reducer. If it is a planetary gear reducer, the reduction ratio can be easily adjusted by changing the gear specifications or changing the number of installation stages of the planetary gear, and even if the planetary gears are installed in multiple stages. There is an advantage that it is possible to avoid an increase in the size of the speed reducer and consequently the electric actuator.
  • the housing can be composed of a plurality of members coupled in the axial direction.
  • the terminal portion holding the electrical component is provided with a cylindrical portion sandwiched from both sides in the axial direction by the structural members of the housing.
  • the cylindrical portion can be provided with a radial through hole that allows the inside and outside of the housing to communicate with each other.
  • the “electrical component” here is a concept including, for example, a power supply circuit for supplying driving power to the motor unit, a rotation angle detection sensor for use in rotation control of the motor unit, and the like.
  • the motor unit only by assembling the casing by connecting the members constituting the casing in the axial direction.
  • the electrical wiring connected to the electrical component is connected to the outside in the radial direction of the housing through the through-hole. It can be pulled out.
  • the wiring work of the electric wiring can be completed in the state of the terminal unit alone, it is not necessary to carry out the complicated wiring work of the electric actuator at the assembly stage. Therefore, the assembling property and productivity of the electric actuator can be improved and the cost can be reduced.
  • At least a part of the stator of the motor part may be fitted into the cylindrical part of the terminal part.
  • the electric actuator in which the ball screw device is adopted as the motion conversion mechanism, there is an effect that a possibility that the output member becomes inoperable with the return of the origin of the output member may occur.
  • the electric actuator which is excellent in the operation accuracy of the output member and rich in reliability can be provided.
  • FIG. 1 is a longitudinal sectional view of an electric actuator according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line EE in FIG. 1. It is the longitudinal cross-sectional view which took out the rotor and motion conversion mechanism part of the motor, and was expanded.
  • FIG. 5 is a cross-sectional view taken along line FF in FIG. 1. It is a longitudinal cross-sectional view which shows the state which integrated the ring gear in the casing. It is the longitudinal cross-sectional view which took out the stator and terminal part of the motor, and was expanded.
  • FIG. 2 is a cross-sectional view taken along line GG in FIG. 1.
  • FIG. 2 is a cross-sectional view taken along line HH in FIG. 1.
  • FIG. 10 is a cross-sectional view taken along the line II in FIG. 9.
  • It is a schematic block diagram which shows the control system of the electric actuator of FIG.
  • It is a block diagram which shows the control system of the electric actuator which concerns on other embodiment.
  • It is a conceptual diagram for demonstrating the problem which may occur with the conventional electric actuator.
  • It is the Z section enlarged view of Drawing 13, and is a figure showing the state where there is no bending in the output member of the actuator containing a screw axis.
  • It is a Z section enlarged view of Drawing 13 and is a figure showing the state where bending has arisen in the output member of an actuator.
  • FIG. 1 is a longitudinal sectional view of an electric actuator according to an embodiment of the present invention
  • FIG. 2 is a sectional view taken along line EE in FIG. 1
  • FIG. The longitudinal cross-sectional view which took out and expanded the mechanism part is shown. 1 and 2 show a state where the output member 3 of the electric actuator is located at the origin.
  • “the state of being located at the origin” means that the head 90 of the actuator head 39 in which the end portions 90a, 90b on one side and the other side of the annular origin positioning member 90 face each other in the axial direction. This is a state in which the end face of the portion 39a and the opening end face 20a1 of the casing 20 are in a position to be engaged in the axial direction.
  • the electric actuator 1 includes a motor unit A that is driven by the supply of electric power, and a motion conversion mechanism unit B that converts the rotational motion of the motor unit A into a linear motion and outputs the linear motion. , An operation unit C for operating an operation target (not shown), and a terminal unit D, which are accommodated and held in the housing 2.
  • the housing 2 is composed of a plurality of members coupled in the axial direction in a coaxial arrangement, and has a bottomed cylindrical shape as a whole.
  • the casing 2 of this embodiment includes a cylindrical casing 20 having both ends opened in the axial direction, a cover 29 serving as a bottom portion that closes the end opening on the other axial side of the casing 20, and the casing 20 and the cover 29. It consists of the coupling
  • the cover 29 and the terminal main body 50 are fixedly attached to the casing 20 by assembly bolts 61 shown in FIGS.
  • the motor part A includes a stator 23 fitted and fixed to the inner peripheral surface of the casing 20 and the terminal main body 50 (the cylindrical part 50A thereof), and a rotor 24 disposed opposite to the inner periphery of the stator 23 via a radial gap. And a radial gap type motor 25 (specifically, a three-phase brushless motor having a U phase, a V phase, and a W phase).
  • the stator 23 includes an insulating bobbin 23b attached to the stator core 23a, and a coil 23c wound around the bobbin 23b.
  • the rotor 24 includes a rotor core 24a, a permanent magnet 24b as a rotor magnet attached to the outer periphery of the rotor core 24a, and a rotor inner 26 as a hollow rotating shaft that is formed in a hollow shape and has the rotor core 24a attached to the outer periphery.
  • the rotor core 24 a is fitted to the outer peripheral surface 26 b of the rotor inner 26 after setting the side plate 65 on the shoulder portion 26 a on one axial side of the rotor inner 26.
  • the permanent magnet 24b (see FIG. 2) is fitted to the outer periphery of the rotor core 24a, the side plate 65 attached to the axially outer side of the other end of the rotor core 24a in the axial direction of the rotor inner 26, and its It is positioned and fixed by a circlip 66 attached to the outside in the axial direction.
  • an inner raceway surface 27 a of the rolling bearing 27 is formed on the outer periphery of one end of the rotor inner 26 in the axial direction, and the outer ring 27 b of the rolling bearing 27 is fixed to the inner peripheral surface of the casing 20.
  • the bearing holder 28 is attached to the inner peripheral surface.
  • a rolling bearing 30 is mounted between the inner peripheral surface of the other end in the axial direction of the rotor inner 26 and the outer peripheral surface of the cylindrical portion 29 a of the cover 29.
  • the motion conversion mechanism unit B of the present embodiment includes a ball screw device 31 and a planetary gear speed reducer 10 as a speed reducer. Adjacent to one side in the axial direction.
  • the ball screw device 31 is rotatably fitted to the outer periphery of the screw shaft 33 via a plurality of balls 34 and a screw shaft 33 arranged coaxially with the rotation center of the rotor 24, so that torque can be transmitted to the rotor inner 26.
  • the nut member 32 arrange
  • a plurality of balls 34 are loaded between the spiral groove 32a formed on the inner peripheral surface of the nut member 32 and the spiral groove 33a formed on the outer peripheral surface of the screw shaft 33, and the top 35 is incorporated. .
  • the screw shaft 33 constitutes the output member 3 of the electric actuator 1 together with the inner member 36 and the actuator head 39 as the operation portion C.
  • the screw shaft 33 is formed in a hollow shape having a hole portion 33b extending in the axial direction (in this embodiment, through holes opened on both end surfaces in the axial direction) 33b, and the inner member 36 is accommodated in the hole portion 33b.
  • the inner member 36 is made of, for example, a resin material such as PPS, and has a circular solid portion 36a provided at an end portion on one side in the axial direction, a flange portion 36b provided at an end portion on the other side in the axial direction, It has integrally the cylinder part 36c which connects both parts 36a and 36b.
  • the inner member 36 accommodated in the hole 33b of the screw shaft 33 is connected and fixed to the screw shaft 33 by fitting a pin 37 so as to penetrate the circular solid portion 36a and the screw shaft 33 in the radial direction.
  • the Both end portions of the pin 37 protrude radially outward from the outer peripheral surface of the screw shaft 33, and a guide collar 38 is rotatably fitted on the protruding portion.
  • the guide collar 38 is formed of a resin material such as PPS, for example, and is fitted into an axial guide groove 20b (see also FIG. 5) provided on the inner periphery of the small diameter cylindrical portion 20a of the casing 20.
  • the screw shaft 33 (including the output member 3) linearly moves in the axial direction while being prevented from rotating. .
  • the screw shaft 33 linearly moves (forwards) from the other side in the axial direction toward one side in the axial direction or linearly moves (retreats) from one side in the axial direction toward the other side in the axial direction is basically determined. Specifically, although it is determined according to the rotation direction of the nut member 32, in this embodiment, the screw shaft 33 can be moved backward by the spring force of the compression coil spring 48 (details will be described later).
  • an actuator head 39 as an operation portion C is detachably attached to one end of the screw shaft 33 in the axial direction. Therefore, the output member 3 of the electric actuator 1 is composed of a combined body such as the screw shaft 33, the inner member 36, the pin 37, the guide collar 38, and the actuator head 39.
  • the actuator head 39 of the present embodiment is a so-called push type that pressurizes an operation target in the axial direction as the screw shaft 33 linearly moves (advances) in one axial direction, and has a convex curved tip surface.
  • the head portion 39a, a base portion 39b fixed to the screw shaft 33, and a stepped cylindrical intermediate portion 39c provided between the head portion 39a and the base portion 39b are integrally provided.
  • the actuator head 39 As the actuator head 39, a so-called push-pull type that can operate the operation target on both sides in the axial direction can be adopted.
  • the type and shape of the actuator head 39 to be used is determined in consideration of the equipment used (the shape and operation mode of the operation target) on which the electric actuator 1 is mounted.
  • An annular origin positioning member 90 is disposed between the head 39a of the actuator head 39 and the housing 2 (casing 20) in order to determine the origin position of the output member 3.
  • the origin positioning member 90 is engaged with the end surface of the output member 3 (the end surface on the other side in the axial direction of the head 39b of the actuator head 39) facing the end portion 90a on the one axial direction in the axial direction.
  • the actuator head 39 is fixed to the outer peripheral surface of the intermediate portion 39c. As shown in FIGS.
  • the origin position of the output member 3 is such that the end portion 90a on the one side in the axial direction of the origin positioning member 90 is in the axial direction with the end face on the other side in the axial direction of the head 39b of the actuator head 39. While being engaged, the end portion 90b on the other side in the axial direction of the origin positioning member 90 is set to a position where it is engaged with the opening end surface 20a1 of the casing 20 in the axial direction.
  • the inner end surface of the bottom portion (cover 29) of the housing 2 is the end surface on the other axial side of the flange portion 36 b of the inner member 36. And an axial gap 4.
  • the origin positioning member 90 has an elastic restoring force against an axial compressive load.
  • the origin positioning member 90 having the above configuration is formed of an elastic material, here a rubber material.
  • the origin positioning member 90 may be formed of an elastic material other than a rubber material, for example, a resin material or a thermoplastic elastomer.
  • the planetary gear reducer 10 is disposed between the ring gear 40 fixed to the casing 20, the sun gear 41 fixed to the rotor inner 26, and the ring gear 40 and the sun gear 41.
  • 40 (41 in this embodiment), a planetary gear carrier 43 and a planetary gear holder 44 that rotatably hold the planetary gear 42, and the planetary gear carrier 43 includes: The revolution movement of the planetary gear 42 is taken out and output.
  • the sun gear 41 is press-fitted into the inner circumferential surface 26c of the step portion of the rotor inner 26. If it does in this way, the connection workability at the time of an assembly will be favorable. Even if such a connection structure is adopted, the sun gear 41 only needs to be able to rotate integrally with the rotor inner 26 before being decelerated, so that the torque transmission performance required between them can be sufficiently secured. Further, since the rotor inner 26 and the sun gear 41 are connected at a position directly below the rolling bearing 27 that supports the rotor inner 26, the rotational accuracy of the sun gear 41 is also good.
  • the outer periphery of the ring gear 40 is provided with notches 40 a projecting radially outward at a plurality of locations (four locations in the illustrated example) spaced apart in the circumferential direction.
  • the grooves are fitted in axial grooves 20e (see also FIG. 5) provided at a plurality of locations (four locations in the illustrated example) separated in the circumferential direction of the surface 20c.
  • the planetary gear carrier 43 has a cylindrical portion 43a interposed between the inner peripheral surface of the rotor inner 26 and the outer peripheral surface 32b of the nut member 32.
  • the planetary gear carrier 43 is rotatable relative to the rotor inner 26, and is connected to the nut member 32 so as to transmit torque.
  • the outer peripheral surface of the cylindrical portion 43 a faces the inner peripheral surface 26 d of the rotor inner 26 (and the inner peripheral surface of the sun gear 41) via a radial gap, and the inner peripheral surface 43 b of the cylindrical portion 43 a is the nut member 32.
  • the outer peripheral surface 32b is press-fitted and fixed. If such a connection structure is adopted, in addition to good connection workability at the time of assembly, stable torque transmission is possible even for high torque after deceleration.
  • the rotation of the rotor 24 of the motor 25 is reduced and transmitted to the nut member 32 by the planetary gear speed reducer 10 having the above configuration. Thereby, since a rotational torque can be increased, the small motor 25 can be employ
  • a thrust washer 45 is disposed between the end face on one axial side of the nut member 32 and the casing 20, and the thrust attached to the outer periphery of the distal end portion of the cylindrical portion 29 a of the cover 29.
  • a needle roller bearing 47 as a thrust bearing is disposed between the receiving ring 46 and the end surface on the other axial side of the nut member 32.
  • the motion converting mechanism B is disposed on the radially outer side of the screw shaft 33 (between the inner peripheral surface 29 b of the cylindrical portion 29 a of the cover 29 and the outer peripheral surface of the screw shaft 33).
  • the compression coil spring 48 is provided. Ends on one side and the other side in the axial direction of the compression coil spring 48 are in contact with the needle roller bearing 47 and the flange portion 36b of the inner member 36 connected to the screw shaft 33, respectively.
  • the output member 3 including the screw shaft 33 is always urged toward the other side in the axial direction (origin side) by the spring force of the compression coil spring 48 provided in the above-described manner. In this way, for example, when the driving power is not properly supplied to the motor 25, the output member 3 is automatically returned to the origin, and the possibility of adversely affecting the operation of the operation target (not shown) is possible. Can be reduced. Further, if the compression coil spring 48 is provided in the above-described manner, an axial pressure can be applied to the nut member 32. Thereby, the response delay resulting from the operation gap provided between the nut member 32 and the screw shaft 33 can be eliminated, and the operability of the screw shaft 33 and thus the output member 3 can be improved.
  • FIG. 9 is a left side view of FIG. 1, and FIG. 10 is a cross-sectional view taken along the line II in FIG.
  • the cover 29 is formed of a metal material excellent in workability and thermal conductivity, for example, an aluminum alloy, a zinc alloy, or a magnesium alloy.
  • a cooling fin for increasing the cooling efficiency of the electric actuator 1 may be provided on the outer surface of the cover 29.
  • a bearing mounting surface 63 on which the rolling bearing 30 is mounted and a fitting surface 64 on which the thrust receiving ring 46 is fitted are provided on the outer peripheral surface of the cylindrical portion 29 a of the cover 29.
  • a through hole (not shown) through which the assembly bolt 61 of the electric actuator 1 is inserted and a mounting bolt for attaching the electric actuator 1 to a device to be used are inserted into the cover 29.
  • a through hole 62 is provided.
  • FIG. 1 is a cross-sectional view taken along line GG in FIG. 1
  • FIG. 8 is a cross-sectional view taken along line HH in FIG.
  • the terminal portion D has a cylindrical portion 50 ⁇ / b> A that constitutes a part of the housing 2, and a disk shape that extends radially inward from the other axial end of the cylindrical portion 50 ⁇ / b> A.
  • a resin-made terminal main body 50 integrally having a portion 50B, a bus bar 51 screwed to the terminal main body 50 (the disk-shaped portion 50B thereof), and a perforated disk-shaped printed circuit board 52 are provided.
  • the terminal main body 50 (the cylindrical portion 50A) is provided for attaching the through-hole 50C through which the assembly bolt 61 shown in FIGS. Through holes 50D through which the bolts are inserted, and are sandwiched between the casing 20 and the cover 29 by the assembly bolts 61 (see FIGS. 1 and 2).
  • the terminal part D (terminal body 50) collectively holds electrical components such as a power supply circuit for supplying driving power to the motor 25 and various sensors described later.
  • the power feeding circuit connects the coils 23c of the stator 23 to the terminals 51a of the bus bar 51 for each of the U phase, the V phase, and the W phase.
  • the terminal 51 b of 51 and the terminal block 50 a of the terminal body 50 are fastened with screws 70.
  • the terminal block 50a has a terminal 50b to which a lead wire (not shown) is connected.
  • the lead wire has a radial through hole 50c (see FIG. 1) provided in the cylindrical portion 50A of the terminal body 50.
  • a controller 81 see FIG. 11 or 12
  • the electric actuator 1 of this embodiment is equipped with two types of sensors, and these two types of sensors are held in the terminal portion D.
  • one of the two types of sensors is a rotation angle detection sensor 53 used for rotation control of the motor 25, and the other is an axial displacement of the screw shaft 33 (output member 3).
  • This is a stroke detection sensor 55 used for detecting the amount.
  • a Hall sensor which is a kind of magnetic sensor is used as the rotation angle detection sensor 53 and the stroke detection sensor 55.
  • the rotation angle detection sensor 53 is attached to a printed circuit board 52, and via a pulsar ring 54 attached to an end on the other axial side of the rotor inner 26 and an axial clearance. Opposed.
  • the rotation angle detection sensor 53 determines the timing for supplying current to each of the U phase, V phase, and W phase of the motor 25.
  • the stroke detection sensor 55 is attached to a belt-like printed board 56 that extends in the axial direction and has an end on the other side in the axial direction connected to the printed board 52. .
  • the printed circuit board 56 and the stroke detection sensor 55 are disposed on the inner periphery of the hole 33b of the screw shaft 33, more specifically, on the inner periphery of the cylindrical portion 36c of the inner member 36 accommodated in the hole 33b.
  • a permanent magnet 57 as a target is attached to the inner periphery of the cylindrical portion 36c of the inner member 36 so as to face the stroke detection sensor 55 via a radial gap.
  • the stroke detection sensor 55 detects the axial and radial magnetic fields formed around the permanent magnet 57, and calculates the axial displacement amount of the screw shaft 33 based on this.
  • the signal line of the rotation angle detection sensor 53 and the signal line of the stroke detection sensor 55 are both through holes 50c in the radial direction provided in the cylindrical portion 50A of the terminal body 50. It is pulled out to the outer diameter side of the housing 2 via (see FIG. 1) and connected to the control device 80 (see FIG. 11 or FIG. 12).
  • the ring gear 40 is assembled in the casing 20.
  • the rotor 24 of the motor 25 and the subassembly of the motion conversion mechanism B shown in FIG. 3 are inserted into the casing 20.
  • the planetary gear 42 and the ring gear 40 are engaged with each other, the guide collar 38 is fitted into the guide groove 20 b of the casing 20, and the bearing holder 28 is fitted into the inner peripheral surface 20 c of the casing 20.
  • the stator 23 is fitted to the inner periphery of the casing 20 in the subassembly of the stator 23 and the terminal portion D (terminal body 50) of the motor 25 shown in FIG. Are fastened by an assembly bolt 61 (see FIGS. 9 and 10). Thereby, the electric actuator 1 is completed.
  • the operation mode of the electric actuator 1 having the above configuration will be briefly described with reference to FIGS.
  • the ECU calculates a required position command value based on the operation amount.
  • the position command value is sent to the controller 81 of the control device 80, and the controller 81 calculates a motor rotation angle control signal necessary for the position command value and sends this control signal to the motor 25.
  • the output member 3 including the screw shaft 33 moves forward while being prevented from rotating.
  • the screw shaft 33 moves forward to a position based on the control signal of the controller 81, and the actuator head 39 mounted on one end of the screw shaft 33 in the axial direction operates (pressurizes) an operation target (not shown).
  • the axial position of the screw shaft 33 (the amount of displacement in the axial direction) is detected by the stroke detection sensor 55 as shown in FIG. 11, and the detection signal is sent to the comparison unit 82 of the control device 80. Then, the comparison unit 82 calculates the difference between the detection value detected by the stroke detection sensor 55 and the position command value, and the controller 81 is based on the calculated value and the signal sent from the rotation angle detection sensor 53. A control signal is sent to the motor 25. In this way, the position of the screw shaft 33 (output member 3) is feedback controlled. For this reason, when the electric actuator 1 of this embodiment is applied to, for example, shift-by-wire, the shift position can be reliably controlled.
  • the electric power for driving the motor 25, the sensors 53, 55, etc. is supplied from an external power source (not shown) such as a battery provided on the vehicle side to a power supply circuit held in the control device 80 and the terminal portion D. Via the motor 25 and the like.
  • An annular origin positioning member 90 that determines the origin position of the output member 3 by engaging the both end surfaces in the axial direction is provided. If such an origin positioning member 90 is provided, the origin position of the output member 3 can be set easily and accurately without using the bottom portion (cover 29) of the housing 2. In addition, since the origin positioning member 90 has an elastic restoring force in the axial direction, if the axial dimension of the origin positioning member 90 is set appropriately, the output member 3 and the housing are brought together with the return of the origin of the output member 3.
  • the origin positioning member 90 is in front of the opening end surface 20a1 of the housing 2 and the end surface on the other side in the axial direction of the output member 3 facing this (the head of the actuator head 39).
  • the elastic restoring force in the axial direction is generated by being sandwiched between the portion 39b and the other end surface of the portion 39b in the axial direction.
  • an annular protrusion having a substantially triangular cross-section projecting to the other side in the axial direction is provided integrally with the origin positioning member 90, thereby The other side can be preferentially compressed over one side in the axial direction.
  • the other side can be preferentially compressed over one side in the axial direction. This is because it is possible to easily position the origin of the output member 3 during normal operation by preferentially compressing the other side in the axial direction of the origin positioning member 90, and a large impact load such as an axial load. This is because when the compressive load acts on the output member 3, the impact load is efficiently reduced on one side in the axial direction of the origin positioning member 90.
  • the inner end surface of the cover 29 is connected to the end surface of the output member 3 via the axial gap 4 (the other axial direction of the flange portion 36b of the inner member 36). Therefore, the possibility that the output member 3 and the cover 29 abut against each other in the axial direction can be further effectively reduced as the output member 3 returns to the origin. Therefore, the possibility that the ball screw device 31 falls into the locked state can be further effectively reduced. Therefore, according to the present invention, the origin of the output member 3 can be easily reduced while effectively reducing the possibility of occurrence of a serious defect such that the output member 3 becomes inoperable when the output member 3 returns to the origin. Since it becomes possible to set, the electric actuator 1 which is excellent in the operation accuracy of the output member 3 and has high reliability can be realized.
  • the rotor inner 26 as a hollow rotating shaft is rotatably supported at one end in the axial direction by a rolling bearing 27 disposed in the vicinity of one end in the axial direction of the rotor core 24a, and the other in the axial direction of the rotor core 24a.
  • the other end portion in the axial direction is rotatably supported by a rolling bearing 30 disposed close to the end portion on the side.
  • the rolling bearings 27 and 30 that support the rotor inner 26 may support a radial load about the weight of the rotor 24.
  • the rotor inner 26 integrally including the inner raceway surface 27a of the rolling bearing 27 does not need to be formed of a high-strength material.
  • the rotor inner 26 may be formed of an inexpensive mild steel material in which heat treatment such as quenching and tempering is omitted. Necessary strength can be ensured.
  • the electric actuator 1 of the present embodiment since the rotational motion of the motor 25 is transmitted to the nut member 32 via the planetary gear speed reducer 10, no radial load is generated, and the linear motion of the screw shaft 33 is not caused.
  • the accompanying reaction force (thrust load) is directly supported by the needle roller bearing 47. Accordingly, since the rolling bearing 27 only needs to have a radial positioning function, the rotor inner 26 integrally including the inner raceway surface 27a of the rolling bearing 27 is sufficient for the material specifications as described above. Thereby, the cost of the electric actuator 1 can be reduced.
  • the nut member 32 can be mounted even when the nut member 32 is loaded with the thrust load. Since it is possible to rotate with low torque, it is possible to promote downsizing of the motor 25.
  • the needle roller bearing 47 is disposed within the axial range between the rolling bearings 27 and 30, the screw shaft 33 is moved along with the linear movement of the screw shaft 33 (output member 3). Accordingly, the operation accuracy and durability of the output member 3 can be improved, and a needle roller bearing 47 that is compact in the axial direction can be employed.
  • the needle roller bearing 47 is disposed near the center in the axial direction between the rolling bearings 27 and 30. In this case, it is more advantageous for the moment load. As a result, extremely small ones can be employed as the needle roller bearing 47, the thrust receiving ring 46, and the like. Therefore, the axial dimension L (see FIG. 1) of the electric actuator 1 (housing 2) by providing the needle roller bearing 47 and the thrust receiving ring 46 can be prevented as much as possible.
  • the motor part A (motor 25) realized by providing the planetary gear speed reducer 10 and the needle roller bearing 47 in the motion conversion mechanism part B, and the cylindrical part 43a of the rotor inner 26 and the planetary gear carrier 43 are realized.
  • the radial dimension M (see FIG. 1) of the housing 2 can be made as small as possible. Thereby, the electric actuator 1 can be made more compact, and the mountability with respect to the equipment used is improved.
  • the motor part A and the motion conversion mechanism part B A part can be shared.
  • the versatility is improved, and it becomes easy to realize a series of electric actuators 1 with a wide variety of deployments in which parts are shared.
  • the cylindrical portion 50A of the terminal body 50 has a through hole 50c that allows the inside and outside of the housing 2 to communicate with each other.
  • the lead wire connected to the power feeding circuit and the signal wire (electrical) connected to the sensors 53 and 55 described above. Wiring) is pulled out radially outward of the housing 2 through the through hole 50c.
  • the terminal body 50 alone, that is, the electrical system necessary for operating the electric actuator 1 appropriately and accurately is the housing 2 (electric actuator 1).
  • the coupling partner member here, In particular, the terminal body 50 can be shared as long as the shape of the coupled portion of the casing 20. As a result, it is possible to easily cope with the development of various types (series) of electric actuators 1 by sharing parts and members.
  • the two electric actuators 1 (units of the motor part A, the motion conversion mechanism part B and the terminal part D) are arranged continuously in the axial direction.
  • An electric actuator capable of individually operating two operation objects can also be realized.
  • Such an electric actuator can be preferably mounted on, for example, a DCT which is a kind of automatic transmission, and can contribute to the compactness of the entire DCT.
  • the electric actuator 1 of the present embodiment has the characteristic configuration as described above, the operation accuracy of the output member 3 is excellent and reliable, and it is lightweight, compact, and excellent in mountability to the used device. It is easy to assemble and can be manufactured at a low cost. Furthermore, it is easy to develop a wide variety of products (series) by sharing parts.
  • the origin positioning member 90 formed of an elastic material such as a rubber material is used.
  • an elastic body such as a compression coil spring or the elastic body is used. You may comprise with the member provided.
  • the origin positioning member 90 having a predetermined shape can be easily manufactured by using an elastic material, it is advantageous in suppressing an increase in cost due to the additional provision of the origin positioning member 90.
  • a rolling bearing other than the needle roller bearing 47 for example, a cylindrical roller bearing may be employed.
  • the needle roller bearing 47 is preferable in consideration of the load supporting ability and the axial dimension of the bearing.
  • the planetary gear speed reducer 10 is provided in the motion conversion mechanism B, but a speed reducer other than the planetary gear speed reducer 10 may be employed.
  • a speed reducer such as the planetary gear speed reducer 10
  • the rotor 24 (rotor inner 26) of the motor 25 and the nut member 32 of the ball screw device 31 may be connected so as to be able to transmit torque directly. Then, it is necessary to adopt a different shape for at least one of the rotor inner 26 and the nut member 32.
  • a cylindrical intermediate member is disposed between the inner peripheral surface 26d of the rotor inner 26 and the outer peripheral surface 32b of the nut member 32, and the outer peripheral surface of this intermediate member
  • Each of the inner peripheral surface is preferably coupled to the inner peripheral surface 26d of the rotor inner 26 and the outer peripheral surface 32b of the nut member 32 so as to be able to transmit torque (not shown).
  • the stroke detection sensor 55 is used. However, the stroke detection sensor 55 may be used as necessary, and depending on the device used, the stroke detection sensor 55 may be used. May be omitted.
  • FIG. 12 is an example of pressure control, and a pressure sensor 83 is provided on an operation target not shown.
  • the ECU calculates a required pressure command value.
  • the controller 81 calculates a motor rotation angle control signal necessary for the pressure command value and sends this control signal to the motor 25.
  • the screw shaft 33 moves forward to a position based on the control signal of the controller 81, and the actuator head 39 attached to one end of the screw shaft 33 in the axial direction is An operation target not shown is operated.
  • the operating pressure of the screw shaft 33 is detected by a pressure sensor 83 installed outside and feedback-controlled. For this reason, when the electric actuator 1 that does not use the stroke detection sensor 55 is applied to, for example, brake-by-wire, the brake hydraulic pressure can be reliably controlled.
  • the screw shaft 33 may be a solid one and the inner member 36 may be omitted.
  • the solid screw shaft 33 is used and the compression coil spring 48 is provided, a screw shaft 33 having a flange portion at the other end in the axial direction is employed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transmission Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

Actionneur électrique (1) qui est équipé d'un moteur (A), d'un mécanisme de conversion de mouvement (B) et d'un carter cylindrique à fond (2) logeant ceux-ci, le mécanisme de conversion de mouvement (B) comportant un arbre à vis (33) et un élément écrou (32) qui est fixé en rotation sur la périphérie de l'arbre à vis (33) par le biais de billes (34), un élément de sortie (3) comprenant l'arbre à vis (33) se déplaçant linéairement dans une direction axiale en association avec la rotation de l'élément écrou (32), un élément de positionnement d'origine annulaire (90) pour déterminer une position d'origine de l'élément de sortie (3) se trouvant entre une face d'extrémité d'ouverture (20a1) du carter (2) et une face d'extrémité de l'élément de sortie (3) opposée à celle-ci par entrée en prise de ceux dans une direction axiale, et l'élément de positionnement d'origine (90) fournissant une force de rappel élastique dans la direction axiale.
PCT/JP2017/017157 2016-05-23 2017-05-01 Actionneur électrique WO2017203944A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-102565 2016-05-23
JP2016102565A JP6736352B2 (ja) 2016-05-23 2016-05-23 電動アクチュエータ

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WO2017203944A1 true WO2017203944A1 (fr) 2017-11-30

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JP2022057147A (ja) * 2020-09-30 2022-04-11 株式会社ハイレックスコーポレーション 車両用ブレーキ装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003329070A (ja) * 2002-05-15 2003-11-19 Nissin Kogyo Co Ltd 電気式ディスクブレーキ
JP2005170064A (ja) * 2003-12-05 2005-06-30 Toyota Motor Corp 車輌用操舵装置
JP2009156354A (ja) * 2007-12-27 2009-07-16 Jtekt Corp ボールねじ装置
JP2013126315A (ja) * 2011-12-15 2013-06-24 Mitsubishi Material C.M.I. Corp モータ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003329070A (ja) * 2002-05-15 2003-11-19 Nissin Kogyo Co Ltd 電気式ディスクブレーキ
JP2005170064A (ja) * 2003-12-05 2005-06-30 Toyota Motor Corp 車輌用操舵装置
JP2009156354A (ja) * 2007-12-27 2009-07-16 Jtekt Corp ボールねじ装置
JP2013126315A (ja) * 2011-12-15 2013-06-24 Mitsubishi Material C.M.I. Corp モータ

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JP2017210976A (ja) 2017-11-30

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