KR20160082233A

KR20160082233A - Self-Locking Mechanism

Info

Publication number: KR20160082233A
Application number: KR1020150189560A
Authority: KR
Inventors: 유안 춘 장; 파 윤 퀴; 진 안 니에; 루이 펭 퀸
Original assignee: 존슨 일렉트릭 에스.에이.
Priority date: 2014-12-30
Filing date: 2015-12-30
Publication date: 2016-07-08
Also published as: DE102015122969A1; CN105805306A; DE102015122969A8; CN105805306B; BR102015032820A2; JP2016137888A

Abstract

The present invention provides a self-locking mechanism, especially, but not exclusively, suitable for use in an electric parking braking system and suitable for an electric parking braking system incorporating a self-locking mechanism. The self-locking mechanism has a driving member (52), a driven member (54), a stationary member (80), a lock holder (56) and multiple lock elements (564). The lock holder encircles the driving member and the driven member. The lock holder has a support base (562) and ribs (563) extending from the support base. A lock element (564) is coupled to the axial end portion of each of the ribs (563). The lock elements are radially positioned between the radial outer surface of the driven member (54) and the inner wall of the stationary member (80). A distance between the radial outer surface and the inner wall gradually decreases from a center toward opposite circumferential sides. The maximum distance between the radial outer surface and the inner wall is greater than the diameter of the lock element, and the minimum distance is smaller than the diameter of the lock element.

Description

{Self-Locking Mechanism}

The present invention relates to an electric parking brake system for a vehicle, and more particularly to a magnetic locking mechanism suitable for use in an electric parking brake system.

A parking brake system for a vehicle is designed to prevent movement of a parked vehicle. Traditional parking brake systems are operated manually. The driver needs to physically pull the lever in order to apply the parking brake. Electric parking brake (EPB) systems are replacing traditional parking brake systems. The EPB system includes a plurality of actuators, each driven by an electric motor, to actuate the brakes of the vehicle. The actuator may include a lead screw or a ball screw. The user activates the motor by pressing the button and rotates the lead screw or ball screw of the actuator to apply the brake.

However, an actuator using a lead screw has low efficiency. The use of a ball screw can improve the efficiency for the actuator, but the actuator is not self-locking. If the vehicle is located on a slope, the vehicle can be "relaxed" by the actuator and can begin to move after applying the brakes. Alternatively, the motor needs to maintain activation over the entire time the parking brake is active, which is not a desirable situation due to obvious safety issues.

There is therefore a need for a magnetic locking mechanism suitable for use with an electric parking brake system that is particularly suitable for use in an electric parking brake system, but non-exclusively, and that includes a magnetic locking mechanism.

Thus, in one aspect, the present invention provides a magnetic locking mechanism comprising: a driving member;

A driven member arranged to drive the driving member; A fixing member; A plurality of locking elements; And a lock holder surrounding the drive member and the driven member to hold the lock element, the lock holder comprising: a support base; and a plurality of support members arranged on the inner wall of the support base in a circumferential direction A plurality of ribs, an axial end portion of each rib extending to the fixing member, wherein the driving member, the driven member, the fixing member, and the lock holder are coaxial with respect to each other; Wherein each of the locking elements is coupled to an axial end portion of a respective rib and is positioned between a radially outer surface of the driven member and an inner wall of the holding member; The distance between the radially outer surface of the driven member and the inner wall of the fixing member gradually decreases from the center of the radially outer surface to the opposite side in the circumferential direction of the radially outer surface, Wherein the maximum distance between the inner walls is larger than the diameter of the locking element and the minimum distance between the radially outer surface of the driven member and the inner wall of the fixing member is smaller than the diameter of the locking element, When rotated, the lock holder is rotated by the drive member to hold each lock element substantially at the center of each radially outer surface; And when the driven member is rotated by an external force, the radially outer surface of the driven member rotates with respect to the locking element to lock the locking element between the fixing member and the radially outer surface of the driven member, Thereby preventing further rotation of the moving member.

Preferably, the fixing member is stacked on the axial end of the support base of the lock holder.

Preferably, at least one drive block is provided on the drive member, a plurality of stop blocks are provided on the driven member, the at least one drive block is disposed between the plurality of stop blocks, One drive block is configured to engage the plurality of stop blocks to rotate the driven member, and the outer surface of each of the plurality of stop blocks is at least a portion of the radially outer surface of the driven member.

Preferably, the driving member and the driven member are sleeved on a shaft in order in the axial direction, the driving member is fixedly coupled to the shaft to rotate together with the shaft, and the driven member is rotatably supported on the shaft And is rotationally coupled.

Preferably, the driving member further comprises a fixing portion, the fixing portion being fixedly coupled to the shaft, the at least one driving block extending radially outward from the fixing portion, the at least one driving block Wherein the axial height is higher than the axial height of the fixed portion and a portion of the at least one drive block extends axially from the fixed portion to define an installation space between the at least one drive block and the shaft, The driven member further includes a connecting portion extending into the installation space and rotationally sleeved on the shaft, and each of the plurality of stop blocks extends radially outward from the connecting portion.

Preferably, the at least one drive block includes a plurality of drive blocks uniformly distributed in the circumferential direction of the drive member on the drive member, wherein the plurality of stop blocks of the driven member and the plurality of drive blocks The plurality of ribs of the lock holder and the plurality of drive blocks are alternately positioned in the circumferential direction.

Preferably, the cross-section of each of the plurality of stop blocks is in the shape of an isosceles trapezoid, the outer surface of each of the plurality of stop blocks toward the plurality of ribs is substantially planar, And is positioned between each of the outer surfaces and the inner wall of the fixing member.

Preferably, the at least one driving block includes a first driving portion and a second driving portion extending radially outward from the first driving portion, and the first driving portion is configured to drive the plurality of stop blocks of the driven member And the second driving portion is configured to drive a plurality of ribs of the lock holder, wherein a width of each of the first driving portions in the circumferential direction is smaller than a width of each of the second driving portions, 1 drive.

Preferably, each of the locking elements is substantially cylindrical, and the axis of each of the locking elements is substantially parallel to the axis of the locking holder.

According to a second aspect, the present invention is an actuator of an electric parking brake system comprising a motor, an output member, and a transmission located between the motor and the output member, the transmission including the magnetic locking mechanism described above.

Preferably, the transmission further includes a transmission mechanism and a planetary gear mechanism, wherein the planetary gear mechanism includes a gear housing, a sun gear, a planetary carrier, and a plurality of planetary gears, A plurality of planetary gears are housed in the gear housing and protrude from the outer surface of the gear housing to limit rotation of the gear housing, ring gears are arranged on the inner surface of the gear housing, The gear is fixedly coupled to the output gear of the transmission mechanism, and a plurality of planetary gears are rotatably coupled to the planetary carrier, each of the plurality of planetary gears meshing with the sun gear and the ring gear, Carrier.

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, In the drawings, identical structures, elements or parts appearing in more than one drawing are denoted by the same reference numerals in the drawings in which they appear. The volume and features of the components shown in the figures are generally selected for clarity of presentation and need not necessarily be drawn to scale. The drawings are as follows.
1 shows an actuator of an electric parking brake system according to a preferred embodiment of the present invention.
2 is an isometric sectional view of the actuator of Fig.
3 is a front cross-sectional view of the actuator of Fig.
Figure 4 is an isometric view of the magnetic locking mechanism of the actuator of Figure 1;
5 is a cross-sectional view of the magnetic locking mechanism of Fig.
6 is an exploded isometric view of the magnetic locking mechanism of FIG.
Figure 7 is a view taken on another side similar to Figure 5;
8 is a schematic view of a first state of the magnetic locking mechanism at the time of braking.
9 is a schematic diagram of a second state of the magnetic locking mechanism after a brake.
10 is a schematic diagram of a third state of the magnetic locking mechanism after a brake.

Figures 1 to 3 illustrate an actuator of an electric parking brake (EPB) system according to a preferred embodiment of the present invention. The actuator includes a two-part casing 10, an electric motor 20 accommodated in the casing 10, and a transmission 30 coupled to the motor 20. [

The casing (10) includes a lower casing (12) and an upper casing (14) coupled to the lower casing (12). The lower casing 12 and the upper casing 14 together define a partition in which the motor 20 and the transmission 30 are accommodated. The motor 20 includes a rotor having a shaft 22, and the transmission 30 is coupled to the shaft 22. The shaft 22 rotates when the motor 20 is operated. The shaft 22 drives the transmission 30. The brake (not shown) of the EPB system is moved by the output member 79 to operate the brake. Transmission 30 is self-locking, meaning that the motor can drive the output member, but the external force applied to the output member can not drive the motor. Therefore, once the brake is applied, the motor can be deactivated and the brake will remain applied until the motor is operated to relax the brake. The motor 20 is operated in the opposite direction (counter-rotated) to drive the transmission 30 to relax the brake.

In at least one embodiment, at least one annular washer 16 is positioned between the motor 20 and the lower casing 12, and / or at least one annular washer 16 is positioned between the motor 20 and the lower casing 12, (30) and the upper casing (14). The washer 16 may be made of rubber and / or any other suitable material capable of absorbing or buffering the vibrations from the motor 20 and the transmission 30.

The transmission 30 includes a housing 40, a magnetic locking mechanism 50 accommodated in the housing 40, a transmission mechanism 60 coupled to the magnetic locking mechanism 50, and a planetary gear mechanism 60 coupled to the transmission mechanism 60. [ (70).

The housing 40 includes a base 42 and a cover 44 that is secured to the base 42. The base 42 includes a substrate 420, a sidewall 422 extending vertically from the edge of the substrate 420 toward the cover 44 and a sidewall 422 extending perpendicularly from the edge of the substrate 420 in a direction away from the cover 44 And a lower wall 424 extending therefrom. The cover 44 includes a top wall 440 and side walls 442 extending vertically from the edges of the top wall 440 toward the substrate 420. Preferably, the top plate 440 is substantially parallel to the substrate 420 and away from the substrate 420. Preferably, the size and shape of the top plate 440 and the substrate 420 are the same or substantially the same. The side wall 442 of the cover 44 contacts the side wall 422 of the base 42. Therefore, the housing 40 defines a receiving space between the base 42 and the cover 44. [ The magnetic locking mechanism 50 and the transmission mechanism 60 are received within the housing space of the housing and are aligned side by side. The magnetic lock mechanism 50 is located at the shaft end of the motor and the transmission mechanism 60 is located at the side of the motor 20. [

The lower wall 424 of the base 42 may form a hollow cylinder extending outwardly from the substrate 420 in a direction away from the transmission mechanism 60. The planetary gear mechanism 70 is received in a hollow cylinder formed by the lower wall 424. The rotation of the motor 20 is transmitted to the output member 79 via the magnetic lock mechanism 50, the transmission mechanism 60 and the planetary gear mechanism 70 to actuate the brakes to apply brakes or relax the brakes . The magnetic locking mechanism 50 can prevent the external force from reversing the motor to apply the brake or relax the more important brake. Therefore, once applied, the brake remains applied until the motor is operated to relax the brake.

4 to 7, the magnetic locking mechanism 50 includes a driving member 52, a driven shaft 54, a lock holder 56, and a fixing member 80. [ The driving member 52, the driven member 54, the lock holder 56, and the fixing member 80 are coaxial with each other. The driving member 52 and the driven member 54 are sequentially sleeved on the shaft 22. [ The lock holder 56 is sleeved on the outside of the driving member 52 and the driven member 54. The drive member 52 is fixedly coupled to the shaft 22 and rotates with the shaft. The driven member 54 is rotatably sleeved on the shaft 22 and is rotatable relative to the shaft 22. The driven member 52 is arranged to rotate the driven member 54 around the shaft.

An opening is defined in the substrate 420. The shaft 22 passes through the opening of the substrate 420. The fixed sheet 421 is arranged on the substrate 420. The fixed sheet 421 is a sidewall surrounding the opening and extends from the substrate 420 to the receiving space. The fixed sheet 421 may be coaxial with the opening, and the inner diameter of the fixed sheet 421 is slightly larger than the diameter of the opening. In at least one embodiment, the magnetic locking mechanism 50 is rotatably received in a fixed seat 421. The diameter of the opening of the substrate 420 is greater than the diameter of the shaft 22 and is preferably greater than or equal to the outer diameter of the driven member 54. [ The outer diameter of the lock holder 56 of the magnetic locking mechanism 50 is slightly smaller than the inner diameter of the fixed sheet 421. [

The lock holder 56 includes a support base 562 and a plurality of locking elements 564 arranged on the support base 562. The support base 562 is received in the fixed sheet 421 and mounted on the substrate 420. Preferably, the support base is in the form of a ring. In at least one embodiment, the inner diameter of the support base 562 is greater than the diameter of the opening of the substrate 420 to reduce the contact area. In another embodiment, the inner diameter of the support base 562 is designed to be equal to or slightly smaller than the diameter of the opening of the substrate 420. The fixing member 80 is stacked on the support base 562. [ The holding member 80 is generally in a hollow circular shape so that the shaft 22 can pass through the holding member 80. Each of the two lugs 82 extends from the fixing member 80 and the fixed sheet 421 further includes two lugs for fixing the fixing member 80 to the housing 40. The fixing member 80 can be fixed on the sheet 421 fixed by a screw or other connecting element that passes through the lug 82 of the fixing member 80 and the corresponding lug of the fixed sheet 421. [ Therefore, the lock holder 56 is sandwiched between the fixing member 80 and the substrate 420 to position the lock holder 56 in the axial direction.

A plurality of ribs 563 protrude from the inner wall of the support base 562 and are arranged. In at least one embodiment, the ribs 563 are uniformly arranged in the circumferential direction of the support base 562. Preferably, the interior surface of each rib 563 is generally arcuate and the arcuate interior surface of each rib 563 is located on a virtual cylindrical surface that is coaxial with the support base 562. The arcuate inner surface of each rib 563 can form a portion of the imaginary cylindrical surface. The diameter of the imaginary cylindrical surface is less than the inner diameter of the support base 562. The axial end portions of the ribs 563 extend from the support base 562 and reach the fixing member 80. The locking element 564 is rotatably supported by the axial end portions of the respective ribs 563. Grooves are defined in each rib 563 to accommodate corresponding locking elements 564. The grooves radially cross the ribs 563. The locking element 564 extends in the radial direction of the lock holder 56 beyond the inner and outer radial sides of the rib 563. The axis of the locking element 564 on each rib 563 is parallel or substantially parallel to the axis of the lock holder 56. In at least one embodiment, each locking element 564 is a cylindrical roller. The locking element 564 is symmetrically positioned about the axis of the lock holder 56.

The driving member 52 is disposed in the support base 562. The drive member 52 includes a fixed portion 522 fixedly coupled to the shaft 22 and a plurality of drive blocks 524 extending radially outwardly from the fixed portion 522. The outer diameter of the fixing portion 522 is smaller than the diameter of one of the engraved circles of the ribs 563. Therefore, there is no contact between the fixing portion 522 and the rib 563 of the lock holder 56 during the rotation of the fixing portion 522. [ In at least one embodiment, the drive blocks 524 are uniformly arranged in the circumferential direction of the fixed portion 522. The number of the drive blocks 524 may be the same as the number of the ribs 563 of the lock holder 56. [ When assembled, each drive block 524 is positioned between two adjacent ribs 563. The driving block 524 of the driving member 52 and the ribs 563 of the lock holder 56 are positioned alternately in the circumferential direction.

8, each drive block 524 includes a first drive portion 526 extending radially outwardly from the fixed portion 522 and a second drive portion 526 extending further outwardly from the radial end of the first drive portion 526. [ And a driving unit 528. The width of each of the first driving portions 526 in the circumferential direction is smaller than the width of each of the second driving portions 528. [ The opposite sides of each of the second driving portions 528 protrude above the corresponding first driving portion 526. The first drive 526 is configured to interact with the driven member 54. [ The second drive 528 is configured to interact with the rib 563 of the lock holder 56. The diameter of the end portion of the second drive portion 528 is greater than the diameter of the cylindrical surface described above but slightly less than the inner diameter of the support base 562 to avoid contact with the inner wall of the support base 562. In at least one embodiment, the axial length of the drive block 524 is greater than the axial length of the securing portion 522. The axial end or upper portion of the drive block 524 protrudes axially through the fixed portion 522 and surrounds the shaft 22. Therefore, a circular mounting space is defined between the drive block 524 and the shaft 22, and the driven member 54 is disposed.

The driven member 54 includes a connecting portion 542 which is rotatably sleeved on the shaft 22 and a plurality of stop blocks 544 which extend radially outward from the outer circumferential surface of the connecting portion 542. The stop block 544 is uniformly arranged in the circumferential direction of the driven member 54. [ Preferably, the number of stop blocks 544 is equal to the number of drive blocks 524 of the drive member 52. In at least one embodiment, the connecting portion 542 extends into a circular mounting space defined between the drive block 524 and the shaft 22. [ Each of the stop blocks 544 is positioned between two adjacent drive blocks 524. The drive block 524 of the drive member 52 and the stop block 544 of the driven member 54 are positioned alternately in the circumferential direction. Each stop block 544 corresponds to one rib 563 of the lock holder 56 in the radial direction.

In at least one embodiment, the cross section of each stop block 544 is an isosceles trapezoidal shape or a generally isosceles trapezoidal shape. Preferably, the outer surface 545 of each stop block 544 towards the ribs 563 is generally planar. The distance between the outer surface 545 and the axial or axial centerline of the drive member 54 gradually increases from the center of the outer surface 545 toward the circumferentially opposite sides of the outer surface 545. [ Therefore, the distance between the inner wall of the fixing member 80 and the outer surface 545 gradually decreases from the center of the outer surface 545 to the circumferential opposite side. The distance between the inner wall of the holding member 80 and the outer surface 545 is maximum at the circumferential center of the outer surface and this distance is slightly greater than the diameter of the locking element 564. The distance between the inner wall of the holding member 80 and the circumferential side of the outer surface 545 is less than the diameter of the locking element 564. [ The driven member 54 can be rotated relative to the fixed member 80 when the locking element 564 is located at a position corresponding to the center of the outer surface 545. [ Rotation of the driven member 54 relative to the lock holder 56 will cause the locking element to move to the side of the circumferential side of the outer surface 545 when the lock holder 56 does not move, (54), the driving member (54) prevents further rotation.

As shown in Figs. 2 and 3, the transmission mechanism 60 may be a multi-stage gear drive. The transmission mechanism 60 includes an input gear 62, a middle gear 64, and an output gear 66 which are sequentially engaged with each other. The input gear 62 is integrated with the driven member 54 and is sleeved on the shaft 22. The intermediate gear 64 is coupled between the top plate 440 of the housing 40 and the substrate 420 by an idler axle 65. The intermediate gear is driven by the input gear 62. The output gear 66 is connected to the housing 40 by an axle 67. The upper end of the axle 67 is fixedly connected to the upper plate 440 of the housing 40. The lower end of the axle 67 passes through the substrate 420 of the housing 40 and is connected to the planetary gear mechanism 70. The output gear 66 is driven by the intermediate gear 64. In at least one embodiment, the number of intermediate gears 64 may be one, two, two, or more, or may be omitted based on available mounting space and actual requirements.

The planetary gear mechanism 70 includes a gear housing 72, a planetary carrier 74 received in the gear housing 72, a sun gear 76 mounted on the planetary carrier, and a plurality of planetary gears 78.

The gear housing 72 is carried by the interior of the lower wall 424 of the housing 40 of the transmission 30. [ The fixed block 73 protrudes from the outer wall surface of the gear housing 72. The securing slot 425 is defined in the lower wall 424 corresponding to the securing block 73. The fixed block 73 is locked and engaged in the corresponding fixed slot 425 to prevent rotation of the gear housing 72. The ring gear is formed on or fixed to the inner wall surface of the gear housing 72 and meshes with the planetary gear 78. The planet carrier 74 is rotatably coupled to the bottom of the axle 67. The sun gear 76 is mounted on the planet carrier 74 and is further sleeved on the shaft 67. The sun gear 76 is fixedly coupled to the output gear 66 of the transmission mechanism 60 and rotates synchronously with the output gear 66. The planetary gear 78 is rotationally coupled to the planet carrier 74 via a respective stub axle (not shown). The planetary gear 78 surrounds the sun gear 76. Each of the planetary gears 78 is engaged with the sun gear 76 and the ring gear on the inner wall surface of the ring gear 72 simultaneously. The output member 79 is fixedly coupled to the planet carrier 74 and rotates with the planet carrier 74. The output member 79 preferably passes through the lower wall 424 of the base 42 of the transmission 30 and is accessible through the casing 10 or at least through the casing 10. [ Preferably, the output member 79 is integral with the carrier 74.

When the EPB system is activated, the motor 20 drives the shaft 22 to rotate the output member. 8, the rotation of the shaft 22 rotates the driving block 524 of the driving member 52 of the magnetic locking mechanism 50 in the clockwise direction. When the driving member 52 rotates, the first driving portion 526 of the driving block 524 contacts the stop block 544 of the driven member 54 and the second driving portion 528 of the driving block 524 Contacts the rib 563 of the lock holder 56 and drives the driven member 54 and the lock holder 56 to synchronously rotate together. The synchronous rotation of the drive 524, the driven member 54 and the lock holder 56 causes the locking element 564 on the lock holder 56 to move in a direction corresponding to the center of the stop block 544 of the driven member 54 Keep the position. This prevents the locking element 564 from moving to a position corresponding to the two circumferential sides of the outer surface 545 of the stop block 544 and prevents the locking element 564 from being tied to the inner wall of the holding member 80 prevent. The rotation of the driven member 54 by the driving member 52 is thus achieved smoothly.

The rotation of the driven member 54 rotates the input gear 62 of the transmission mechanism 60 and the rotation of the input gear 62 is transmitted to the output gear 66 via the intermediate gear 64. Thereby, the sun gear 76 coupled to the output gear 66 is rotated, and each of the planetary gears 78 engaged with the sun gear 76 rotates on its axis. The planetary gear 78 rotates around the sun gear 76 and on its own axis since the planetary gear 78 meshes with the ring gear of the non-rotatable gear housing 72. [ The rotational speed of the planetary carrier 74 is equal to the rotational speed of the planetary gear 78 around the sun gear 76. [ Therefore, the high-speed rotation of the motor 20 can be converted into the low-speed rotation of the planetary carrier 74. [ Therefore, the output member 79 coupled to the planet carrier 74 rotates at a lower rotational speed than the motor to apply the brake.

9, when the output member 79 performs the reverse rotation, the driven member 54 is rotated by the planetary gear mechanism 70 and the transmission mechanism 60, as shown in Fig. 9, when the EPB system performs the brake function And is rotated counterclockwise. The driving block 524 of the driving member 52 is difficult for the stop block 544 of the driven member 54 so that the rotation of the driven member 54 causes the driving member 52 To rotate in the counterclockwise direction. That is, the driven member 54 drives the driving member 52 so that the lock holder is not rotated by the stop block 544 of the driven member, so that the driven member 54 is rotated with respect to the lock holder 56. The distance between the outer surface 545 of the stop block 544 and the inner wall of the fastening member 80 gradually decreases from the center to the two circumferential sides of the outer surface 545 so that the locking elements 564 Is substantially tangential to the center of the outer surface 545. [ The rotation of the driven member 54 relative to the lock holder 56 causes the position of the contact between the locking element 564 and the outer surface 545 to move toward the side of the outer surface 545, The locking element 564 is engaged between the inner surface of the outer surface 545 and the inner surface of the outer surface 545. Therefore, the rotation of the driven member 54, which reacts on the output member 79 via the transmission mechanism 60 and the planetary gear mechanism 70, is prevented. The rotation of the output member 79 is stopped, so that the brake function is maintained. Therefore, the actuator of the electric parking brake system is able to withstand the reverse drive by the opposite rotation of the output member 79. [ After applying the brake, the magnetic lock function keeps the brake active until the motor is operated to relax the brake.

When the brakes of the vehicle are relaxed as shown in Fig. 10, the motor 20 rotates the shaft 22 in the counterclockwise direction. The opposite rotation of the shaft 22 rotates the driving member 52 of the magnetic locking mechanism 50 in the counterclockwise direction so that the stop block 544 of the driven member 54, which is in contact with the driving block 524, Separates the block 524 and further separates the drive block 524 from the rib 563 of the lock holder 56. Next, the driven member 54 and the lock holder 56 do not operate. The driving block 524 is brought into contact with another adjacent rib 563 of the lock holder 56 and the other adjacent stop block 544 of the driven member 54 ). The circumferential length of the second driving portion 528 of the driving block 524 is larger than the circumferential length of the first driving portion 526 of the driving block 524 so that the second driving portion 528 is larger than the first driving portion 526 It will contact the rib 563 of the lock holder 56 earlier. The second drive 528 drives the lock holder 56 to move the lock element 564 to the center of the outer surface 545 of the stop block 544 and release the lock element from coming into contact with the stationary member, And is rotated with respect to the driven member 54. Next, the first driving portion 526 makes contact with the stop block 544 of the driven member 54 and rotates the driven member 54. The drive member 52 is driven by the driven member 54 and the lock holder 70 so that the output member 79 performs an opposite rotation through the transmission mechanism 60 and the planetary gear mechanism 70 to relax the brake. 56 to rotate in the counterclockwise direction together.

The clockwise rotation of the motor 20 is illustrated to illustrate how the actuator of the electric parking brake system performs the brake function, the self-locking function after the brake, and the relaxation of the brake function. It should be appreciated that the motor 20, which rotates in a counterclockwise direction when the drive between the output member 79 and the brake makes a corresponding change, can also perform the functions described above. After the actuator of the EPB system performs the braking function, the system moves through the different contact positions between the stop block 544 of the driven member 54 and the locking element 564 of the lock holder 56, 54 and the friction between the locking element 564 and the inner wall of the fixing member 80 is utilized so that the reverse rotation of the output member 79 is transmitted to the planetary gear mechanism 70, It is avoided to be transmitted to the driving member through the mechanism and the driven member 54. After the operation of the motor, the self-locking function is automatically applied. Since the actuator can self-lock function after the brake itself, a drive mode with low friction and high efficiency between the actuator and the brake can be realized.

The term "coupled" is defined as being connected indirectly, either directly or through mediated components, and is not necessarily limited to physical connections. The connection may be such that the object is permanently connected or detachably connected. The term "substantially" is defined to essentially correspond to a particular dimension, shape, or other feature, so that the part need not be accurate. For example, "substantially cylindrical" means that the object resembles a cylinder, but may have more than one difference in a real cylinder.

In the detailed description and the claims of this application, the verbs "comprise", "include", "contain", and "have" And are not intended to identify the presence of the foregoing items, nor to exclude the presence of additional items or features.

It will be apparent that certain features of the invention, which are, for clarity, described in the context of the individual embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided individually or in any suitable sub-combination.

The foregoing embodiments are provided by way of example only and various modifications will be apparent to those skilled in the art without departing from the scope of the present invention as defined by the appended claims.

Claims

As a magnetic locking mechanism:
A driving member (52);
A driven member (54) arranged to drive the driving member;
A fixing member 80;
A plurality of locking elements (564); And
A lock holder (56) for holding said locking element,
, Wherein the lock holder (56) surrounds the drive member (52) and the driven member (54), the lock holder comprising:
Support base 562, and
A plurality of ribs 563 arranged on the inner wall of the support base in the circumferential direction of the support base, the axial end portions of the respective ribs extending to the fixing member 80,
Wherein the driving member (52), the driven member (54), the holding member (80), and the lock holder (56) are coaxial with respect to each other;
Each of the locking elements 564 is coupled to an axial end portion of a respective rib 563 and is positioned between the radially outer surface of the driven member 54 and the inner wall of the holding member 80; Also
Wherein the distance between the radially outer surface of the driven member and the inner wall of the fixing member gradually decreases from the center of the radially outer surface to the opposite side in the circumferential direction of the radially outer surface, Wherein the minimum distance between the radially outer surface of the driven member and the inner wall of the fixing member is less than the diameter of the locking element,
When the driving member 52 rotates the driven member 54, the locking holder 56 is rotated by the driving member so that each locking element 564 rotates substantially at the center of each radially outer surface Lt; RTI ID = 0.0 >
When the driven member 54 is rotated by an external force, the radially outer surface of the driven member rotates with respect to the locking element 564 so that the locking element can be moved to the fixed member 80 and the driven member 54) to prevent further rotation of said driven member (54).

The magnetic locking mechanism according to claim 1, wherein the fixing member (80) is laminated on the axial end of the support base (562) of the lock holder (56).

The method of claim 1, wherein at least one drive block (524) is provided on the drive member (52), a plurality of stop blocks (544) are provided on the driven member (54) Wherein the at least one drive block is configured to engage a plurality of stop blocks to rotate the driven member (54), wherein an outer surface of each of the plurality of stop blocks (544) Is at least part of the radially outer surface of the driven member (54).

The drive system of claim 3, wherein the drive member (52) and the driven member (54) are sleeved on a shaft (22) in an axial direction and the drive member (52) And the driven member (54) is rotatably coupled to the shaft.

The apparatus of claim 4, wherein the drive member (52) further comprises a fixed portion (522), the fixed portion is fixedly coupled to the shaft (22), and the at least one drive block Wherein the axial height of the at least one drive block is higher than the axial height of the fixed portion and a portion of the at least one drive block extends axially from the fixed portion, Wherein the driven member defines a mounting space between the block and the shaft and the driven member further includes a connecting portion extending into the mounting space and rotatably sleeved on the shaft, (544) each extend radially outwardly from the connecting portion (542).

4. The apparatus of claim 3, wherein the at least one drive block (524) includes a plurality of drive blocks uniformly distributed in a circumferential direction of the drive member on the drive member (52) The block 544 and the plurality of drive blocks 524 are alternately disposed in the circumferential direction and the plurality of ribs 563 and the plurality of drive blocks of the lock holder 56 are alternately located in the circumferential direction , Magnetic lock mechanism.

4. The apparatus of claim 3, wherein each of the plurality of stop blocks (544) has a cross section of an isosceles trapezoidal shape, each outer surface of the plurality of stop blocks facing the plurality of ribs (563) Element 564 is positioned between the outer surface of each of the plurality of stop blocks and the inner wall of the securing member 80.

4. The apparatus of claim 3, wherein the at least one drive block (524) includes a first driver (526) and a second driver (528) extending radially outward from the first driver, And the second drive part 528 is configured to drive the plurality of ribs 563 of the lock holder 56. The second drive part 528 is configured to drive the plurality of stop blocks 544 of the first drive part 54, Wherein the width of the first driving portion is smaller than the width of each of the second driving portions, and the two sides of each of the second driving portions protrude above the corresponding first driving portion.

7. The magnetic locking mechanism of claim 1, wherein each of the locking elements (564) is substantially cylindrical and the axis of each locking element is substantially parallel to the axis of the locking holder (56).

An actuator for an electric parking brake system, the actuator comprising a motor (20), an output member (79), and a transmission (30) located between the motor and the output member, the transmission comprising: An actuator comprising a magnetic locking mechanism (50) as claimed in any one of the preceding claims.

The transmission according to claim 10, wherein the transmission further comprises a transmission mechanism and a planetary gear mechanism, wherein the planetary gear mechanism comprises a gear housing, a sun gear, a planet carrier, And a plurality of planet gears (78), wherein the sun gear, the planet carrier, and the plurality of planet gears are housed within the gear housing, and are configured to receive rotation from an outer surface of the gear housing And a ring gear is arranged on the inner surface of the gear housing 72. The sun gear is fixedly coupled to an output gear 66 of the shift mechanism and a plurality of planetary gears 78 are rotatably coupled to the planet carrier 74 and each of the plurality of planet gears engages the sun gear and the ring gear and the output member 79 is coupled to the planetary carrier 74, Data.