WO2019225456A1 - Actionneur pour frein de stationnement électrique - Google Patents

Actionneur pour frein de stationnement électrique Download PDF

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Publication number
WO2019225456A1
WO2019225456A1 PCT/JP2019/019444 JP2019019444W WO2019225456A1 WO 2019225456 A1 WO2019225456 A1 WO 2019225456A1 JP 2019019444 W JP2019019444 W JP 2019019444W WO 2019225456 A1 WO2019225456 A1 WO 2019225456A1
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WO
WIPO (PCT)
Prior art keywords
sprocket
motion
speed reduction
actuator
reduction mechanism
Prior art date
Application number
PCT/JP2019/019444
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English (en)
Japanese (ja)
Inventor
卓志 松任
川合　正浩
慎太朗 石川
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 WO2019225456A1 publication Critical patent/WO2019225456A1/fr

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Classifications

    • 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
    • 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
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/06—Gearings for conveying rotary motion by endless flexible members with chains

Definitions

  • the present invention relates to an actuator used for pressing a brake pad of an electric parking brake device against a brake disc.
  • small electric motors tend to be used in response to demands for space saving and weight reduction.
  • a reduction mechanism is used to decelerate and transmit the rotational motion of the electric motor so that a sufficient output can be obtained.
  • Patent Document 1 discloses a speed reduction mechanism using a plurality of spur gears as a speed reduction mechanism provided in an actuator for an electric parking brake.
  • the actuator when an actuator having a speed reduction mechanism is arranged in a wheel of a wheel, the actuator can be accommodated in a limited space while avoiding interference with peripheral members such as a knuckle, a damper and a steering tie rod that support the wheel. Therefore, further downsizing of the actuator is an important issue.
  • an object of the present invention is to provide an electric parking brake actuator that can obtain a high reduction ratio and can be downsized.
  • the present invention includes an electric motor, a speed reduction mechanism, and a linear motion mechanism, and converts the rotational motion of the electric motor decelerated by the speed reduction mechanism into linear motion by the linear motion mechanism.
  • An electric parking brake actuator that presses a brake pad against a brake disc to generate a braking force on a wheel.
  • the first sprocket is arranged coaxially with the electric motor, and is arranged in parallel to the axis of the first sprocket.
  • the second sprocket and a chain that transmits rotational motion between the first sprocket and the second sprocket, and the speed reduction mechanism has an eccentric portion that moves eccentrically by the rotational motion from the electric motor.
  • the present invention is characterized in that it is an eccentric type deceleration mechanism that decelerates and transmits the applied rotational motion.
  • the actuator can be miniaturized. That is, when power is transmitted between two shafts using only two gears meshing with each other, the gear diameter needs to be increased according to the distance between the two shafts, but in a configuration in which two sprockets are connected by a chain. Since the power can be transmitted using a small-diameter sprocket regardless of the distance between the two axes, the actuator can be miniaturized. Furthermore, by adopting an eccentric speed reduction mechanism as the speed reduction mechanism, it is possible to provide an electric parking brake actuator that is small and can secure a high speed reduction ratio and that is small and that can provide high output.
  • the deceleration mechanism is preferably arranged on the output side of the power transmission mechanism including the first sprocket, the second sprocket, and a chain (hereinafter sometimes abbreviated as “first sprocket etc.”).
  • each sprocket and chain can be made of a resin material.
  • a mechanism provided with a motion conversion mechanism that converts the rotational motion generated in the revolving member during the revolving motion into the rotational motion of the output shaft.
  • an input shaft having an eccentric portion, an external gear having a plurality of teeth provided on the outer peripheral surface as a revolving member, an internal gear having a plurality of teeth provided on the inner peripheral surface, and an output
  • the external gear engages with the internal gear while revolving around the rotation axis of the input shaft as the input shaft rotates, and is provided on the external gear.
  • an actuator for an electric parking brake that is small in size and can provide a high output, so that it is easy or possible to mount the actuator in the wheel of an existing vehicle.
  • FIG. 2 is a longitudinal sectional view taken along the line AA in FIG. It is a longitudinal cross-sectional view of the electric parking brake apparatus shown in FIG. It is a disassembled perspective view of the electric parking brake apparatus shown in FIG.
  • FIG. 1 is a view of a state in which the electric parking brake device is assembled to the vehicle body as viewed from the inner side in the width direction of the wheel
  • FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 3 is a longitudinal sectional view of the electric parking brake device shown in FIG. 1
  • FIG. 4 is an exploded perspective view of the electric parking brake device shown in FIG.
  • the inner side in the vehicle body width direction (left side in FIGS. 2 to 4) when the electric parking brake device is assembled to the vehicle body is referred to as the inner side
  • the outer side in the vehicle body width direction (FIGS. 2 to 5). 4) will be referred to as the outer side.
  • the electric parking brake device 1 includes a brake disc (disc rotor) 2 that rotates together with the wheels, and a pair of brake pads that are disposed on the inner side and the outer side with the brake disc 2 interposed therebetween. 3, 4, a mounting bracket 5 that supports the pair of brake pads 3, 4, a caliper housing 6 that is slidably supported with respect to the mounting bracket 5, a piston 7 that is accommodated in the caliper housing 6, and a piston
  • the actuator 20 for linearly moving the actuator 7 is mainly configured.
  • the mounting bracket 5 is fixed with a bolt to a knuckle 60 (see FIGS. 1 and 2) which is a non-rotating portion that supports the wheel. As shown in FIG. 4, the mounting bracket 5 is disposed on the outer side and an inner pad support portion 8 that supports the brake pad 3 disposed on the inner side so as to be movable toward and away from the brake disk 2. An outer pad support portion 9 that supports the brake pad 4 so as to be movable toward and away from the brake disc 2, and a connecting portion 10 that connects the inner pad support portion 8 and the outer pad support portion 9.
  • the connecting portion 10 is provided at two locations on the inlet side and the outlet side in the rotation direction of the brake disk with respect to the caliper housing 6.
  • Each connecting portion 10 has a pin hole 12 into which a pair of slide pins 11 fixed to the caliper housing 6 are slidably inserted. As each slide pin 11 slides within the pin hole 12, the caliper housing 6 is supported so as to be movable with respect to the mounting bracket 5 via these slide pins 11.
  • the piston 7 in the caliper housing 6 is accommodated so as to be movable in the direction in which the inner brake pad 3 is pressed against the brake disc 2 and in the opposite direction.
  • the piston 7 is advanced toward the brake disk 2 by the pressing of the actuator 20, the inner brake pad 3 is pressed against the brake disk 2 by the piston 7.
  • the caliper housing 6 is moved against the mounting bracket 5 by the reaction force (force in the direction away from the brake disc 2) that the piston 7 receives from the brake disc 2.
  • the caliper housing 6 pushes the outer brake pad 4 in a direction to approach the brake disc 2 so that the outer brake pad 4 is pressed against the brake disc 2.
  • the outer brake pad 4 and the inner brake pad 3 are pressed against the brake disc 2, whereby braking force is generated on the brake disc 2.
  • the actuator 20 includes an electric motor 21, a speed reduction mechanism 30 that reduces and transmits the rotational motion of the electric motor 21, a linear motion mechanism 40 that converts the rotational motion into a linear motion, Rotating between the first sprocket 22 arranged coaxially with the electric motor 21, the second sprocket 23 arranged parallel to the axis of the first sprocket 22, and the first sprocket 22 and the second sprocket 23 A chain 24 for transmitting motion, an actuator case 50 and the like are provided.
  • the actuator case 50 includes a first case 51 provided with an electric motor housing portion 51a in which the electric motor 21 is housed, a speed reduction mechanism housing portion 51b in which the speed reduction mechanism 30 is housed, the chain 24, and the sprockets 22, 23. And the like, and a lid member 53 attached to the electric motor accommodating portion 51a of the first case 51.
  • the electric motor accommodating portion 51 a is formed in a cylindrical shape, and an opening on the outer side is closed by a lid member 53.
  • the speed reduction mechanism housing 51b is formed in a thin cylindrical shape that is shorter in the axial direction than the electric motor housing 51a, and is formed integrally with the electric motor housing 51a.
  • the second case 52 is a lid-like case formed in the same thickness as the speed reduction mechanism accommodating portion 51b, and is fixed to the first case 51 with a bolt or the like so as to close the inner opening. Yes.
  • the actuator case 50 and the caliper housing 6 are fixed with bolts or the like so that the outer opening of the reduction mechanism housing 51b and the inner opening of the caliper housing 6 abut each other.
  • the first sprocket 22 is attached to the rotating shaft 21a of the electric motor 21 so as to rotate integrally.
  • the second sprocket 23 is attached so as to rotate integrally with the input shaft 31 of the speed reduction mechanism 30 disposed in parallel with the rotating shaft 21 a of the electric motor 21.
  • the chain 24 is stretched over the first sprocket 22 and the second sprocket 23, and when the rotating shaft 21 a of the electric motor 21 rotates, the rotational motion is transferred from the first sprocket 22 through the chain 24 to the second sprocket 23. Is transmitted to.
  • the number of teeth of the second sprocket 23 is formed to be larger than the number of teeth of the first sprocket 22, and is transmitted from the first sprocket 22 to the second sprocket 23 via the chain 24. Rotational motion is decelerated.
  • a cycloid speed reduction mechanism that is one of the eccentric speed reduction mechanisms that reduce and transmit the rotational motion applied to the eccentric portion is employed.
  • the speed reduction mechanism 30 is rotatably held on the outer periphery of the eccentric portion 32 via the input shaft 31 having the eccentric portion 32 on the outer periphery and the rolling bearing 36, and the rotation shaft is centered with the rotation of the input shaft 31.
  • An external gear 33 as a revolving member that performs a revolving motion
  • an internal gear 34 that is arranged so as not to rotate on the outer periphery of the external gear 33
  • an output shaft 35 are provided.
  • the input shaft 31 is rotatably supported by a rolling bearing 13 provided in the actuator case 50 (second case 52).
  • the eccentric portion 32 has an outer peripheral surface (eccentric surface) centered on an axis that is eccentric with respect to the rotation axis of the input shaft 31.
  • an annular external gear 33 having a plurality of teeth provided on the outer peripheral surface via a rolling bearing 36 is provided on the outer periphery of the eccentric portion 32.
  • An annular internal gear 34 having a plurality of teeth provided on the inner peripheral surface is disposed on the outer periphery of the external gear 33 so that the internal gear 34 does not rotate to the actuator case 50 (first case 51). It is fixed.
  • the internal gear 34 is arranged coaxially with the rotation shaft of the input shaft 31 and has a larger number of teeth than the external gear 33.
  • the output shaft 35 is supported by a rolling bearing 14 provided in the caliper housing 6 so as to be rotatable coaxially with the rotation shaft of the input shaft 31.
  • the output shaft 35 is provided with a plurality of pin holes 35a. A plurality of pins 33a protruding in the axial direction from the external gear 33 are inserted into each pin hole 35a.
  • the external gear 33 starts a revolving motion around the rotation shaft of the input shaft 31.
  • a part of the teeth of the external gear 33 are engaged with the teeth of the internal gear 34, so that the external gear 33 revolves while rotating.
  • the pin 33 a provided on the external gear 33 contacts the inner wall surface of the pin hole 35 a of the output shaft 35.
  • the revolution movement of the external gear 33 is not transmitted to the output shaft 35 via the pin 33a, and the external gear 33 Only the rotational motion of is transmitted to the output shaft 35 via the pin 33a.
  • the pin 33 a and the pin hole 35 a function as a motion conversion mechanism that converts the rotation motion generated in the external gear 33 (revolution member) during the rotation motion into the rotation motion of the output shaft 35.
  • the rotation of the external gear 33 occurs when the engagement position of the external gear 33 with respect to the internal gear 34 shifts by one tooth along with the revolution movement when the input shaft 31 rotates once. Therefore, if the number of teeth of the internal gear 34 is z, the external gear 33 only rotates 1 / z of one tooth every time the input shaft 31 rotates, and therefore the output shaft 35 is relative to the input shaft 31.
  • the motor is decelerated at the reduction ratio z and rotates.
  • the linear motion mechanism 40 is accommodated in the caliper housing 6.
  • the linear motion mechanism 40 includes a screw shaft 41 having a thread groove formed on the outer peripheral surface, and a cylindrical nut 42 having a screw groove screwed to the screw shaft 41 on the inner peripheral surface.
  • the slide screw mechanism is used. It is also possible to adopt a ball screw mechanism instead of the sliding screw mechanism.
  • the screw shaft 41 is arranged coaxially with respect to the output shaft 35 of the speed reduction mechanism 30 and is coupled to be rotatable integrally therewith. Accordingly, when the screw shaft 41 rotates with the rotation of the output shaft 35 of the speed reduction mechanism 30, the nut 42 moves forward or backward in the axial direction. When the nut 42 moves forward, the inner brake pad 3 is pressed against the brake disc 2 by pressing the piston 7 by the nut 42. At this time, the brake pad 4 on the outer side is also pressed against the brake disc 2 by the above-described action, so that a braking force is generated on the brake disc 2. On the contrary, when the nut 42 moves backward, the piston 7 moves away from the brake disc 2, so that the braking force by the inner brake pad 3 and the outer brake pad 4 on the brake disc 2 is released.
  • the configuration and operation of the actuator 20 according to the present embodiment are as described above.
  • components suitable for miniaturization while ensuring a high reduction ratio will be described.
  • the speed reduction mechanism 30 and the linear motion mechanism 40 are arranged in parallel to the electric motor 21, compared to a configuration in which these are arranged coaxially.
  • the size of the entire actuator 20 in the axial direction is reduced.
  • the protrusion amount of the actuator 20 from the wheel 61 to the inner side is suppressed, and space saving is achieved.
  • power transmission means between two parallel axes from the electric motor 21 to the speed reduction mechanism 30 is required.
  • the two sprockets 22 and 23 and the chain 24 are used as power transmission means, and the sprockets 22 and 23 are connected by the chain 24 so that the small-diameter sprockets 22 and 23 are connected. Even if it is used, power transmission between two parallel axes becomes possible. As a result, the actuator can be further reduced in size, and it becomes easier to mount the actuator in the wheel of an existing vehicle while avoiding interference with peripheral members arranged on the wheel inner side.
  • the two sprockets 22 and 23 and the chain 24 connecting them are used as power transmission means between two parallel shafts, so that the actuator can be downsized.
  • a cycloid reduction mechanism that can obtain a high reduction ratio is used as a separate reduction mechanism in order to compensate for a situation where it is difficult to ensure a high reduction ratio between the sprockets 22 and 23. .
  • the number corresponding to the number of teeth z of the internal gear 34 can be secured as the reduction ratio. For example, when the internal gear 34 having 60 teeth is employed, The reduction ratio is 60, and a high reduction ratio can be ensured while being small.
  • the actuator according to the present embodiment employs a mechanism composed of two sprockets and a chain as power transmission means between two parallel axes, and further adopts a cycloid reduction mechanism as a reduction mechanism.
  • the actuator can be downsized and high output can be secured. As a result, it is possible to provide an electric parking brake actuator that is small in size and can provide a high output, and it is easy or possible to mount the actuator in the wheel of an existing vehicle.
  • the actuator for an electric parking brake according to the present invention is not limited to the above-described embodiment, and can of course be implemented in various forms without departing from the gist of the present invention. .
  • a mechanism that rotates by the revolving external gear 33 engaging the internal gear 34 is employed as the eccentric reduction mechanism.
  • the external gear 33 it is also possible to employ a roller type eccentric speed reduction mechanism including a cage that holds a plurality of rollers provided at equal intervals in the circumferential direction.
  • the speed reduction mechanism 30 is disposed on the output side (downstream of the power transmission path) than the power transmission mechanism including the first sprocket 22, the second sprocket 23, and the chain 24.
  • the speed reduction mechanism 30 can be disposed on the input side (upstream side of the power transmission path) of the power transmission mechanism including the first sprocket 22 and the like.
  • the speed reduction mechanism 30 is disposed on the input side of the power transmission mechanism including the first sprocket 22 and the like, the high torque driving force decelerated by the speed reduction mechanism 30 is transmitted to the sprockets 22, 23 and the chain 24. Therefore, the load on these becomes large.
  • the speed reduction mechanism 30 can be disposed on the output side of the power transmission mechanism including the first sprocket 22 and the like as in the above-described embodiment. preferable. Also, with such an arrangement, the load on each of the sprockets 22, 23 and the chain 24 is reduced and the possibility of breakage is also reduced. Therefore, the sprockets 22, 23 and the chain 24 are made of resin material ⁇ eg, polyacetal ( POM), nylon (PA66, etc.), polybutylene terephthalate (PBT) ⁇ .
  • the actuator for an electric parking brake according to the present invention is not limited to an electric parking brake device mounted on a vehicle such as an automobile, but can also be applied to an electric parking brake device for a motorcycle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)
  • Braking Systems And Boosters (AREA)
  • Retarders (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un actionneur destiné à un frein de stationnement électrique, qui est pourvu d'un moteur électrique (21), d'un mécanisme de réduction de vitesse (30), et d'un mécanisme de mouvement rectiligne (40), et qui convertit, au moyen du mécanisme de mouvement rectiligne (40), le mouvement de rotation du moteur électrique (21), dont la vitesse a été réduite par le mécanisme de réduction de vitesse (30), en mouvement rectiligne, pressant ainsi les plaquettes de frein (3, 4) contre un disque de frein (2) pour générer une force de freinage sur une roue. L'actionneur est pourvu d'un premier pignon (22) qui est disposé de manière coaxiale avec le moteur électrique (21), d'un second pignon (23) qui est disposé parallèlement à l'axe du premier pignon (22), et d'une chaîne (24) qui transmet un mouvement de rotation entre le premier pignon (22) et le second pignon (23). Le mécanisme de réduction de vitesse (30) est formé en tant que mécanisme de réduction de vitesse de type excentrique lequel comporte une section excentrique (32) déplacée de façon excentrique par un mouvement de rotation transmis à partir du moteur électrique (21), le mécanisme de réduction de vitesse (30) réduisant la vitesse du mouvement de rotation appliqué à la section excentrique (32) et transmettant le mouvement de rotation.
PCT/JP2019/019444 2018-05-21 2019-05-16 Actionneur pour frein de stationnement électrique WO2019225456A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018097087A JP2019203518A (ja) 2018-05-21 2018-05-21 電動パーキングブレーキ用アクチュエータ
JP2018-097087 2018-05-21

Publications (1)

Publication Number Publication Date
WO2019225456A1 true WO2019225456A1 (fr) 2019-11-28

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ID=68616666

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Application Number Title Priority Date Filing Date
PCT/JP2019/019444 WO2019225456A1 (fr) 2018-05-21 2019-05-16 Actionneur pour frein de stationnement électrique

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JP (1) JP2019203518A (fr)
WO (1) WO2019225456A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089598A (ja) * 2000-09-12 2002-03-27 Asmo Co Ltd ディスクブレーキ装置
WO2011096449A1 (fr) * 2010-02-03 2011-08-11 曙ブレーキ工業株式会社 Dispositif de frein à disque équipé d'un mécanisme de stationnement électrique
JP2015068445A (ja) * 2013-09-30 2015-04-13 株式会社アドヴィックス 車両の電動制動装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002089598A (ja) * 2000-09-12 2002-03-27 Asmo Co Ltd ディスクブレーキ装置
WO2011096449A1 (fr) * 2010-02-03 2011-08-11 曙ブレーキ工業株式会社 Dispositif de frein à disque équipé d'un mécanisme de stationnement électrique
JP2015068445A (ja) * 2013-09-30 2015-04-13 株式会社アドヴィックス 車両の電動制動装置

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JP2019203518A (ja) 2019-11-28

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