JP2016001016A - Electrically-driven direct-acting actuator and electrically-driven brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembly and maintenance such as repair of an electrically-driven direct-acting actuator including a drive unit using an electric motor as a drive source, a gear reduction mechanism unit, and a direct-acting mechanism unit.SOLUTION: An electrically-driven direct-acting actuator comprises: a drive unit 30 using an electric motor 31 as a drive source; a gear reduction mechanism unit 40 reducing the rotation of a rotor shaft 34a of the electric motor 31 of the drive unit 30 and outputting the reduced rotation; and a direct-acting mechanism unit 70 transforming a rotating motion of a rotary shaft 72 rotating in response to an output from the gear reduction mechanism unit 40 to a linear motion of an outer ring member 73 supported to be slidable along an inside diameter surface of a housing 71, and linearly driving a driven member by the outer ring member 73, the electrically-driven direct-acting actuator being configured so that the gear reduction mechanism unit 40 is accommodated in a gear case 48 connectable to the housing 71 as a sub-unit and provided as a separate unit from the drive unit 30 and the direct-acting mechanism unit 70, and the respective units can be assembled in different processes, thereby facilitating assembly and maintenance.

Description

  The present invention relates to an electric linear actuator that linearly drives a driven member such as a brake pad, and an electric brake device using the electric linear actuator.

  As an electric linear actuator using an electric motor as a drive source, one described in Patent Document 1 has been conventionally known. In the electric linear actuator described in Patent Document 1, a drive unit using an electric motor as a drive source, a gear reduction mechanism unit that decelerates and outputs the rotation of the rotor shaft of the electric motor, and the gear reduction It has a rotating shaft that is rotated by the input from the output gear of the mechanism section, and the rotating motion of the rotating shaft is converted into a linear motion of an outer ring member that is slidably supported along the inner diameter surface of the housing. And a linear motion mechanism that moves the outer ring member in the axial direction, and a driven member such as a brake pad is linearly driven by the outer ring member in the linear motion mechanism.

  Here, the linear motion mechanism unit incorporates a carrier that rotatably supports a plurality of planetary rollers between an outer ring member that is slidably supported along the inner diameter surface of the housing and a rotating shaft that is driven by an electric motor. The rotation of the rotating shaft causes the planetary roller to revolve while rotating by contact friction with the rotating shaft, and is provided on the inner surface of the outer ring member and the spiral groove or circumferential groove formed on the outer surface of the planetary roller. The outer ring member is moved in the axial direction by meshing with the formed spiral protrusion.

JP 2012-87889 A

  By the way, in the electric linear motion actuator described in the above-mentioned Patent Document 1, there is a limitation in the assembly order, and it is necessary to assemble the gear reduction mechanism portion after the linear motion mechanism portion is assembled. It takes time, and there are still points to be improved in facilitating the assembly.

  In addition, if either the linear motion mechanism or the gear reduction mechanism is damaged, it is necessary to disassemble both the linear motion mechanism and the gear reduction mechanism. There are some points that need to be improved.

  An object of the present invention is to facilitate maintenance such as assembly and repair of the electric linear actuator.

  In order to solve the above-described problems, in the electric linear actuator according to the present invention, a drive unit that uses an electric motor as a drive source and a gear that decelerates and outputs the rotation of the rotor shaft of the electric motor of the drive unit It has a speed reducing mechanism and a rotating shaft that is rotated by the output from the gear speed reducing mechanism. The rotating motion of the rotating shaft is converted into the linear motion of the slide member, and the driven member is linearly driven by the slide member. In the electric linear actuator provided with the linear motion mechanism portion, the gear reduction mechanism portion is housed in a gear case connectable to the housing of the linear motion mechanism portion and is configured as a subunit. .

  In the electric brake device according to the present invention, the brake pad is linearly driven by the electric linear actuator, and the disc rotor is pressed by the brake pad to apply a braking force to the disc rotor. In the type brake device, the electric linear actuator is composed of the electric linear actuator according to the present invention, and the brake pad is linearly driven by the slide member in the electric linear actuator.

  Like the electric linear motion actuator according to the present invention, the gear speed reduction mechanism portion is made into a subunit and separated from the linear motion mechanism portion and the drive portion, so that the gear speed reduction mechanism portion, the linear motion mechanism portion, and the drive portion are separated. Each can be assembled in a separate process. And after assembling each part of the gear reduction mechanism part, the linear motion mechanism part and the drive part, it is possible to assemble the electric linear actuator by connecting the parts to each other, and easily assemble the electric linear actuator Can do.

  In addition, by substituting the gear reduction mechanism portion as a subunit, both the gear reduction mechanism portion and the linear motion mechanism portion are disassembled when repairing when either the gear reduction mechanism portion or the linear motion mechanism portion is damaged. There is no need, and maintenance such as repair can be easily performed.

  Here, by making the drive unit and the linear motion mechanism unit into subunits, the electric linear motion actuator can be assembled more easily.

  In the electric linear actuator according to the present invention, a gear case including a base plate that can be connected to the housing and a cover that is connected to the base plate by the connecting means and covers one side of the base plate can be adopted.

  As a connecting means in the gear case, a structure in which the peripheral wall end of the cover is press-fitted into a fitting recess formed on one side of the base plate, or a plurality of elastically deformable claws provided on the peripheral wall end of the cover are provided. The thing of the structure made to snap-fit to the engagement hole formed in the base board is employable.

  Here, if both the input gear and the output gear in the gear reduction mechanism unit are both-end supported to support both ends in the axial direction, a stable support state can be obtained as compared with the case where the cantilever is supported. The gear and the output gear can be rotated with high accuracy.

  Also, if at least one of the gear case in the gear reduction mechanism and the plurality of gears of the gear reducer incorporated in the gear case is made of a resin or sintered material having self-lubricating properties, a bearing is not required. It is possible to reduce costs and facilitate assembly.

  In the electric linear actuator according to the present invention, as described above, the gear reduction mechanism unit is formed as a subunit, so that the electric linear actuator is divided into a gear reduction mechanism unit, a linear movement mechanism unit, and a drive unit, respectively. The electric linear actuators can be assembled in separate processes. After the assembly, the electric linear actuators can be assembled easily by connecting the components to each other.

  In addition, since it is not necessary to disassemble both the gear reduction mechanism and the linear motion mechanism when repairing if either the gear reduction mechanism or the linear motion mechanism is damaged, maintenance such as repair is easily performed. be able to.

The longitudinal cross-sectional view which shows embodiment of the electric brake device which employ | adopted the electric linear motion actuator which concerns on this invention Sectional view along the line II-II in FIG. Sectional view along III-III in FIG. (A) is sectional drawing which expands and shows the gear reduction mechanism part shown in FIG. 3, (b) is a right view of (a). (A) is sectional drawing which shows the drive part of FIG. 3, (b) is the left view of (a). (A) is sectional drawing which shows the linear motion mechanism part of FIG. 3, (b) is a left view of (a). Sectional view along line VII-VII in FIG. Sectional drawing which shows the other example of the connection means which connects a base board and a cover. Sectional view along line IX-IX in FIG. Sectional view of various gears of the gear reduction mechanism supported in a freely rotating manner by slide bearings Sectional view of gear reduction mechanism that uses a gear made of self-lubricating resin

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the electric brake device is provided with a caliper 11 on the outer periphery of a disk rotor 10 that rotates integrally with a wheel (not shown), and an outer side surface of the disk rotor 10 at one end of the caliper 11. A claw portion 12 that is axially opposed to the outer peripheral portion is provided, and the outer brake pad 13 is supported by the claw portion 12.

  Further, an inner brake pad 14 is disposed opposite to the outer peripheral portion of the inner side surface of the disk rotor 10, and the inner brake pad 14 is attached to the disk rotor 10 by an electric linear actuator 20 provided on the other side of the caliper 11. I try to move it.

  A mount 17 is provided on the outer peripheral portion of the inner side surface of the disk rotor 10. The mount 17 is fixedly supported by a knuckle (not shown). As shown in FIG. 2, the ends of a pair of opposed pin support pieces 18 provided on both sides of the mount 17 are orthogonal to the disk rotor 10. Slide pins 19 extending in the direction are provided, and the caliper 11 is slidably supported by each of the slide pins 19.

  Although not shown in detail in the figure, the mount 17 is supported so as to be movable toward the disc rotor 10 in a state in which each of the outer brake pad 13 and the inner brake pad 14 is non-rotatable. doing.

  As shown in FIG. 3, the electric linear actuator 20 includes a drive unit 30, a gear reduction mechanism unit 40, and a linear mechanism unit 70. Here, FIGS. 4A and 4B show the gear reduction mechanism unit 40, and FIGS. 5A and 5B show the drive unit 30. Further, FIGS. 6A and 6B show the linear motion mechanism unit 70, and each part of the drive unit 30, the gear reduction mechanism unit 40, and the linear motion mechanism unit 70 is made into a single unit structure.

  As shown in FIGS. 3 and 5, the drive unit 30 uses an electric motor 31 as a drive source. The electric motor 31 includes a motor case 32, a fixedly arranged stator 33 incorporated in the motor case 32, and a rotatable rotor 34 incorporated in the stator 33. The rotor 34 is rotated by energization.

  Here, the rotor 34 has a rotor shaft 34a, and the rotor shaft 34a is rotatably supported on each of a pair of opposed end plates of the motor case 32 via bearings 35, and one shaft end of the rotor shaft 34a. The part penetrates the end plate of the motor case 32 and faces the outside. The drive unit 30 is thus formed as a subunit that is housed and sealed in the motor case 32.

As shown in FIGS. 3 and 4, the gear reduction mechanism 40, the rotation of the input gear 42 attached to a rotor shaft 34a of the electric motor 31 sequentially by the primary reduction gear train G ₁ and the secondary reduction gear train G ₂ deceleration to become the output gear 43 from the gear reducer 41 for decelerating rotation, primary reduction input side idle gear 45 of the gear train G ₁ of the output-side idle gear 44 and the secondary reduction gear train G ₂ is integrated, the input It is rotatably supported around a gear shaft 47 through a double row bearing 46 incorporated inside the side idle gear 45.

  As shown in FIG. 4, the gear reduction mechanism unit 40 is formed into a subunit by housing a gear reduction device 41 in a gear case 48. The gear case 48 includes a base plate 49 and a cover 50 that covers the entire surface of the base plate 49. The cover 50 has a peripheral wall 51 on the outer periphery, and a flange 52 is provided on the outer periphery of the opening end of the peripheral wall 51.

  The cover 50 is connected to the base plate 49 by the connecting means 53 so that the flange 52 abuts the base plate 49. Here, as the connecting means 53, a fitting recess 54 is provided on one surface of the base plate 49, and the end of the peripheral wall 51 provided on the outer periphery of the cover 50 is press-fitted and fixed to the fitting recess 54.

  As shown in FIGS. 3 and 4, when the gear reducer 41 is accommodated in the gear case 48, the input gear 42 has both end portions in the axial direction at the base plate 49 and the cover 50 via bearings 55. It is supported rotatably. The input gear 42 is detachably attached to the shaft end portion of the rotor shaft 34 a by fitting with the spline 56. The fitting method is not limited to this.

As for the idle gears 44 and 45 in the primary reduction gear train G ₁ and the secondary reduction gear train G ₂ , both ends of the gear shaft 47 that supports the idle gears 44 and 45 are respectively connected to the base plate 49 and the cover 50. I support it.

  Further, both ends of the output gear 43 in the axial direction are rotatably supported on the base plate 49 and the cover 50 via bearings 57, respectively. The output gear 43 is detachably connected to a shaft end portion of a rotating shaft 72 of a linear motion mechanism portion 70 described later by fitting with a spline 58. The fitting method is not limited to this.

  As shown in FIG. 3, the gear reduction mechanism unit 40 formed as a subunit is driven as a subunit by tightening a bolt 59 that passes through the flange 52 and the base plate 49 and is screwed into the motor case 32 of the electric motor 31. It is connected to the part 30. At the time of connection, a circular protrusion 60 is provided on the end plate of the motor case 32 of the electric motor 31 (see FIG. 5), and the protrusion 60 is fitted into a fitting hole 61 formed on the back surface of the base plate 49. Yes.

  The gear reduction mechanism 40 is connected to the linear motion mechanism 70 by tightening a bolt 62 that passes through the flange 52 and the base plate 49 and is screwed into a flange 71 a provided in the housing 71 of the linear motion mechanism 70. . At the time of the connection, the inner end of the housing 71 is fitted into a fitting hole 63 formed in the back surface of the base plate 49.

  As shown in FIGS. 3, 6, and 7, the linear motion mechanism unit 70 is rotated by the output from the output gear 43, with the output gear 43 of the gear reduction mechanism unit 40 being spline fitted to the shaft end. The rotary motion of the rotating shaft 72 is converted into a linear motion of the outer ring member 73 as a slide member that is slidably supported along the inner diameter surface of the housing 71 via the rotation / motion conversion mechanism 80. The inner brake pad 14 as a driving member is linearly driven (see FIG. 1).

  Here, the housing 71 is provided in the caliper 11, and a shaft support member 74 is incorporated therein. The shaft support member 74 has a disk shape, and a boss portion 74a is provided at the center thereof. The shaft support member 74 is prevented from slipping out of the inner side end portion of the housing 71 by an annular projecting portion 75 provided on the inner periphery of the inner side end portion of the housing 71.

  A pair of rolling bearings 76 is incorporated in the boss portion 74 a of the shaft support member 74 at an interval in the axial direction, and the rotating shaft 72 is rotatably supported by the rolling bearings 76. One shaft end of the rotating shaft 72 passes through the end plate of the housing 71 and faces the outside.

  A boot 100 is attached between the outer end of the housing 71 and the outer ring member 73, and the outer end of the housing 71 and the tip of the outer ring member 73 are sealed by the boot 100. As a result, the linear motion mechanism 70 is formed into a subunit housed in the housing 71 as shown in FIG. The rotating shaft 72 of the linear motion mechanism unit 70 formed as a subunit is fitted by the spline 58 to the output gear 43 of the gear reduction mechanism unit 40 formed as a subunit, and the inner side end of the housing 71 is the rear surface of the base plate 49. And is detachably connected to the linear motion mechanism portion 70 by tightening the bolts 62.

  The rotation / motion conversion mechanism 80 has the same spiral groove 83 that meshes with the spiral ridge 82 provided on the inner periphery of the outer ring member 73 on the outer periphery of the planetary roller 81 incorporated between the rotation shaft 72 and the outer ring member 73. The pitch is formed with different lead angles, and the rotation of the rotating shaft 72 causes the outer ring member 73 to move in the axial direction by revolving while rotating the planetary roller 81 by contact with the rotating shaft 72. Yes. Instead of the spiral groove 83, a plurality of circumferential grooves may be formed at equal intervals in the axial direction at the same pitch as the spiral ridge 82.

  Here, the planetary roller 81 is rotatably supported by a carrier 84 that is rotatably supported around the rotation shaft 72. The carrier 84 has a pair of discs 84a and 84b that are opposed in the axial direction, and a plurality of spacing adjusting members 84c are provided at intervals in the circumferential direction toward the other disc 84b on one side outer periphery of one disc 84a. The pair of disks 84a and 84b are connected to each other by tightening a screw 85 screwed into the end face of the distance adjusting member 84c.

  Each of the pair of disks 84 a and 84 b is rotatably supported by a slide bearing 86 incorporated between the rotary shaft 72 and the slide bearing 86 that rotatably supports the outer side disk 84 a. It is secured by a washer 87 fitted to the shaft end and a retaining ring 88 attached to the shaft end of the rotating shaft 72.

  Each of the pair of discs 84a and 84b is provided with a shaft insertion hole 89 formed of a pair of long holes facing each other in the axial direction at intervals in the circumferential direction. The planetary roller 81 is rotatably supported by each of a plurality of roller shafts 90 that are slidably supported.

  Both end portions of the plurality of roller shafts 90 pass through the disks 84a and 84b, and ring grooves 90a are formed on the outer circumferences of the ends located outside from the outer surfaces of the disks 84a and 84b. The grooves of the ring grooves 90a An elastic ring 91 is assembled so as to circumscribe the bottom surface.

  The elastic rings 91 provided at both ends are formed of a C-shaped ring having a cut end at a part in the circumferential direction, and the cross-sectional shape thereof is rectangular. The elastic ring 91 is incorporated in an expanded state and has a restoring elasticity in the direction of diameter reduction. The roller shaft 90 is urged inward by the elastic force, and the planetary roller 81 is connected to the rotating shaft 72. It is in pressure contact with the outer diameter surface. For this reason, when the rotating shaft 72 rotates, the planetary roller 81 rotates in contact with the outer surface of the rotating shaft 72 by frictional contact.

  As shown in FIGS. 1 and 3, a thrust bearing 92, a pressure plate 93, and a pressure receiving plate 94 are arranged between the inner side disk 84 b and the planetary roller 81 in the carrier 84 in the axial direction between the planetary roller 81 side. The pressure plate 93 and the pressure receiving plate 94 are in contact via a spherical seat 95. Further, a gap is provided between the fitting surfaces of the pressure receiving plate 94 and the roller shaft 90, and the roller shaft 90 and the pressure plate 93 are freely adjustable within the range of the gap.

  Further, a backup plate 96 and a thrust bearing 97 are incorporated between the inner side disk 84b of the carrier 84 and the above-mentioned shaft support member 74 that rotatably supports the rotary shaft 72, and from the outer ring member 73 via the planetary roller 81. The axial reaction force applied to the carrier 84 is supported by the thrust bearing 97.

  As shown in FIG. 1, a pressing member 98 is fitted in the outer side end portion of the outer ring member 73. An anti-rotation groove 99 is formed on the front end surface of the pressing member 98, and the outer ring member 73 is engaged with the inner-side brake by engagement of the anti-rotation groove 99 and the anti-rotation protrusion 16 provided on the pad holder 15 of the inner brake pad 14. It is prevented from rotating with respect to the pad 14.

  The electric brake device shown in the embodiment has the above-described configuration. FIG. 1 shows a state in which a braking force is released from the disc rotor 10, and the pair of brake pads 13 and 14 are separated from the disc rotor 10. .

  When the electric motor 31 shown in FIG. 3 is driven in the state where the braking force is released as described above, the rotation of the rotor shaft 34a of the electric motor 31 is decelerated by the gear reducer 41 in the gear reduction mechanism unit 40, and FIG. The rotating shaft 72 shown is rotated.

  Since the outer diameter surfaces of the plurality of planetary rollers 81 are in elastic contact with the outer diameter surface of the rotating shaft 72, the planetary roller 81 rotates due to contact friction with the rotating shaft 72 due to the rotation of the rotating shaft 72. While revolving.

  At this time, since the spiral groove 83 formed on the outer diameter surface of the planetary roller 81 is meshed with the spiral ridge 82 provided on the inner diameter surface of the outer ring member 73, the mesh of the spiral groove 83 and the spiral ridge 82 is engaged. As a result, the outer ring member 73 moves in the axial direction, the inner brake pad 14 in contact with the outer ring member 73 comes into contact with the disk rotor 10, and begins to press the disk rotor 10 in the axial direction. The caliper 11 moves toward the direction in which the outer brake pad 13 supported by the claw portion 12 approaches the disc rotor 10 by the reaction force of the pressing force, and the outer brake pad 13 contacts the disc rotor 10, The outer brake pad 13 strongly clamps the outer periphery of the disk rotor 10 from both sides in the axial direction with the inner brake pad 14, and a braking force is applied to the disk rotor 10.

  When the electric motor 31 is reversely rotated after the braking of the disc rotor 10, the outer ring member 73 moves backward to the position shown in FIG. 1, and the outer brake pad 13 and the inner brake pad 14 release the clamping of the disc rotor 10, The braking force is released.

  As shown in the embodiment, the gear reduction mechanism 41 in the gear reduction mechanism unit 40 is accommodated in the gear case 48 and the gear reduction mechanism unit 40 is formed as a subunit, so that the drive unit 30 and the gear reduction mechanism as separate parts are obtained. Each of the part 40 and the linear motion mechanism part 70 can be assembled in separate processes.

  After the gear reduction mechanism unit 40 and the linear motion mechanism unit 70 are assembled, the gear case 48 in the gear reduction mechanism unit 40 is connected to the linear motion mechanism unit 70 by tightening a bolt 62 screwed into the housing 71 of the linear motion mechanism unit 70. Furthermore, the electric linear actuator 20 can be assembled by connecting to the drive unit 30 by tightening the bolt 59 screwed into the motor case 32, and the electric linear actuator 20 can be easily assembled.

  Further, when any one of the drive unit 30, the gear reduction mechanism unit 40, and the linear motion mechanism unit 70 is damaged, the repair can be performed by disassembling the damaged mechanism unit. Therefore, it is not necessary to disassemble each of the drive unit 30, the gear reduction mechanism unit 40, and the linear motion mechanism unit 70, and maintenance such as repair can be easily performed.

  In the example shown in FIG. 4A, as the connecting means 53 for connecting the base plate 49 and the cover 50, the end of the peripheral wall 51 of the cover 50 is press-fitted into the fitting recess 54 formed in the base plate 49. However, the connecting means 53 is not limited to this.

  8 and 9 show another example of the connecting means 53. FIG. In this example, a plurality of elastically deformable claw portions 101 are provided on the abutting surface of the flange 52 with respect to the base plate 49 in the cover 50, and the claw portions 101 are snap-fitted into the engagement holes 102 formed in the base plate 49. I try to let them.

  As described above, the cover 50 can be easily connected to the base plate 49 by engaging the claw portion 101 with the engagement hole 102 by snap fitting.

  8 and 9, a plurality of elastically deformable claw portions 103 are provided on the back surface of the base plate 49, and the claw portions 103 are snapped into engagement holes 104 formed in the housing 71 and the motor case 32, respectively. The housing 71 and the motor case 32 are connected by fitting.

  In the example shown in FIG. 4A, a rolling bearing is used as the bearing 55 that rotatably supports the input gear 42, the bearing 57 that rotatably supports the output gear 43, and the bearing 46 that rotatably supports the idle gear 45. However, as shown in FIG. 10, each of the bearings 55, 57, and 46 may be a sliding bearing. The use of the plain bearing can reduce the cost.

  In FIG. 11, each of the input gear 42, the output gear 43, and the idle gears 44 and 45 is formed of a self-lubricating resin. By employing a gear made of such a self-lubricating resin, a bearing can be made unnecessary and cost can be reduced.

  Note that the gear may be formed of a self-lubricating sintered material instead of the self-lubricating resin. Further, instead of the input gear 42, the output gear 43, and the idle gears 44 and 45, the gear case 48 may be formed of a resin or a sintered material having self-lubricating properties.

DESCRIPTION OF SYMBOLS 10 Disc rotor 13 Brake pad 14 Brake pad 30 Drive part 31 Electric motor 34a Rotor shaft 40 Gear speed reduction mechanism part 41 Gear speed reducer 42 Input gear 43 Output gear 48 Gear case 49 Base plate 50 Cover 51 Perimeter wall 53 Connection means 70 Linear motion mechanism part 71 Housing 72 Rotating shaft 73 Outer ring member (slide member)

Claims (8)

A drive unit (30) using the electric motor (31) as a drive source, and a gear reduction mechanism unit (40) that decelerates and outputs the rotation of the rotor shaft (34a) of the electric motor (31) of the drive unit (30). ) And a rotating shaft (72) rotated by the output from the gear reduction mechanism (40), and the rotational motion of the rotating shaft (72) is converted into the linear motion of the slide member (73), In the electric linear actuator comprising the linear motion mechanism (70) that linearly drives the driven member by the slide member (73),
An electric linear motion actuator characterized in that the gear reduction mechanism portion (40) is accommodated in a gear case (48) connectable to a housing (71) of the linear motion mechanism portion (70) to form a subunit.   The electric linear actuator according to claim 1, wherein the drive unit (30) and the linear motion mechanism (70) are formed as subunits and are detachably attached to the gear reduction mechanism (40).   The gear case (48) is connected to the base plate (49) by the connecting means (53) by the base plate (49) connectable to the housing (71) and covers the one surface of the base plate (49) (50). The electric linear actuator according to claim 1 or 2, comprising:   The electric type according to claim 3, wherein the connecting means (53) is formed by press-fitting the end of the peripheral wall (51) of the cover (50) into a fitting recess (54) formed on one side of the base plate (49). Linear actuator.   The connecting means (53) is an engagement hole (formed in the base plate (49) of a plurality of elastically deformable claw portions (101) provided at the end of the peripheral wall (51) of the cover (50). 102. The electric linear actuator according to claim 3, wherein the snap fit is engaged with the motor 102).   The electric motor according to any one of claims 1 to 5, wherein each of the input gear (42) and the output gear (43) in the gear reduction mechanism (40) is a double-supported support that supports both ends in the axial direction. Direct acting actuator.   At least one of the gear case (48) and the plurality of gears (42, 43, 44, 45) incorporated in the gear case (48) in the gear reduction mechanism portion (40) is self-lubricating resin or sintered. The electric linear actuator according to any one of claims 1 to 6, wherein the electric linear actuator is made of a material. The brake pad (14) is linearly driven by the electric linear actuator (20), and the disc rotor (10) is pressed by the brake pad (14) to apply a braking force to the disc rotor (10). In the electric brake device
The electric linear actuator (20) comprises the electric linear actuator according to any one of claims 1 to 7, and a brake pad ( 14) connected to the electric brake device.

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