KR101985878B1 - An actuator assembly for electromechanical parking brake having double gear - Google Patents

Abstract

The present invention relates to an electronic parking brake actuator having a double gear. The present invention relates to a motor assembly having a main housing having a motor mounting portion and a gear mounting portion and a motor assembly mounted on the motor mounting portion to provide a rotational force, And a gear assembly 50 that performs an acceleration function through a plurality of gears. The idle gear 51 connected to the motor assembly and the first gear 54 formed on the outer surface of the gear assembly 50 rotate in engagement with the idle gear 51 and a second gear 57 A ring gear 60 provided on the gear mounting portion 21 corresponding to the lower portion of the final gear 53 and having a coiler 63 on the inner surface thereof, The first stage planetary gears 71 and 73 which are composed of the gears 71 and 73 and the second stage planetary gears 75 and 76 are engaged with the second gears 57 of the final gear 53 And the second-stage planetary gears 75 and 76 which rotate and engage with the idler gear 63 of the ring gear 60 rotate. In the present invention, the entire two planetary gear sets 70 constituting the gear assembly 50 are not engaged with the ring gear 60, the first gear is meshed with the final gear 53, the second gear is meshed with the ring gear 60, Respectively. Thus, since the planetary gear set 70 as a whole is not constrained to the ring gear 60, it is possible to freely change the gear ratio within the same package size.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic parking brake actuator having a dual gear,

The present invention relates to an actuator for performing an electronic parking brake operation, and more particularly, to an actuator capable of generating various gear ratios through a dual tooth structure having different gears on the outer surface and inner surface of a final gear constituting a gear assembly The present invention relates to an electronic parking brake actuator.

An electronic parking brake actuator of a vehicle is for operating a friction pad installed in a caliper of a disk brake device when parking. Electronic Parking Brake It is operated automatically by switch operation of user. It consists of electronic parking brake motor and gear assembly (power transmission device) for transmitting power of motor.

When the driver depresses the parking brake switch, the rotational force of the motor of the actuator is transmitted to the input shaft of the caliper through the assembly (power transmission device) such as the decelerator. When the input shaft receiving the power is rotated, the pressurizing connecting sleeve advances, and by the advance of the connecting sleeve, the piston accommodating it and the caliper housing move toward each other. The two friction pads mounted on the piston and caliper housing press against both sides of the disk to restrain it from rotating and park.

The conventional electronic parking brake actuator has a very large variation width of the actuator according to a required performance standard. For example, if the gear ratio needs to be increased to satisfy the required performance, at least some of the built-in gears become larger in size, and thus the overall size of the actuator becomes larger. However, there is a problem that it is difficult to satisfy both the performance criterion and the size condition because the size of the actuator is less than a certain design condition.

Particularly, when the planetary gear set included in the gear portion is composed of two stages, the reduction ratio can be increased, but it is difficult to control the gear ratio of the planetary gear set because all the two-stage planetary gear sets are engaged with one ring gear that surrounds them. Changing the planetary gear set to adjust the gear ratio requires replacing the entire housing, including the ring gear.

In addition, if the planetary gear set is composed of two stages, the overall height of the actuator is increased, and as a result, the size of the entire actuator becomes large.

Korean Patent No. 10-1041553 Korean Patent Publication No. 10-2013-0071256

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional art, and it is an object of the present invention to allow any one of the two planetary gear sets to rotate in engagement with the inside of the final gear constituting the gear assembly.

Another object of the present invention is to allow the outer and inner surfaces of one final gear to rotate in engagement with the idle gear and the planetary gear set, respectively.

According to an aspect of the present invention, there is provided a motor assembly including a main housing having a motor mounting portion and a gear mounting portion, a motor assembly mounted on the motor mounting portion to provide a rotational force, The idle gear connected to the motor assembly and the first gear formed on the outer surface rotate in engagement with the idle gear, A ring gear having a revolution gear provided on the inner surface thereof, a first-stage planetary gear and a second-stage planetary gear, The first-stage planetary gear disposed at the upper portion is engaged with the second gear of the final gear and rotates, and the second single- The gear includes a planetary gear set to rotate in engagement with the ball electrical worth of the ring gear.

The final gear includes a gear body, a first gear formed on an outer circumferential surface of the gear body and meshed with the idle gear, and a second gear formed on an inner circumferential surface of the first rotation space recessed on the bottom surface of the gear body, And a second gear engaged with the first-stage planetary gear.

Wherein when the final gear and the ring gear are stacked, the first rotation space of the final gear and the second rotation space formed inside the ring gear are connected to each other to form one rotation space, and the rotation space includes the planetary gear set Respectively.

Wherein the first planetary gear and the second planetary gear of the planetary gear set are stacked on each other and rotated at the same rotational axis, the first planetary gear is rotated in the first rotational space of the final gear, And the planetary gear is rotated in the second rotation space of the ring gear.

Wherein the first planetary gear of the planetary gear set comprises a first carrier rotatable about a main gear shaft and having a sun gear at the center thereof, and a second planetary gear set, which is connected to a plurality of first planetary gear shafts provided on the first carrier, And a first planetary gear that is housed in a first rotation space of the gear and rotates in engagement with the second gear, the second planetary gear rotates about the main gear shaft, A plurality of second planetary gear shafts provided in the second carrier and rotatable by the sun gear, the sun gear being rotatable in the second rotation space, And a second planetary gear that rotates in engagement with the idler of the ring gear.

The main housing is provided with an installation frame, the idle gear and the final gear are installed on the upper part of the installation frame, and the ring gear is detachably assembled to the lower part of the installation frame. Respectively.

The first sun gear of the final gear is provided at the center of the first rotation space of the final gear, the first sun gear is made of water separate from the final gear, and is assembled or insert injected into the final gear, The gear cover rotatably supports the upper end of the first sun gear projected to the upper portion of the final gear.

The electronic parking brake actuator having the double gear according to the present invention as described above has the following effects.

In the present invention, the entire two planetary gear sets constituting the gear assembly are not engaged with the ring gear, the first gear is engaged with the final gear, and the second gear is engaged with the ring gear. Therefore, since the planetary gear set as a whole is not constrained to one ring gear, it is possible to freely change the gear ratio within the same package size, thereby increasing the degree of design freedom.

In the present invention, since the final gear performs one-stage deceleration and the planetary gear set performs the second-stage and third-stage deceleration, a total third deceleration is achieved, so that a gear ratio sufficiently large in a predetermined size can be produced, Thereby improving the performance of the apparatus.

Particularly, in the present invention, the planetary gear set has a form in which the final gear and the ring gear encircle and engage with each other in the rotation space, so that the overall package size and weight of the actuator can be further reduced.

Further, in the present invention, not only the final gear but also the ring gear can be easily separated from the mounting frame, so that the work for changing the gear ratio can be easily performed.

1 is a perspective view showing an embodiment of an electronic parking brake actuator having a double gear according to the present invention.
FIG. 2 is an exploded perspective view of the embodiment of FIG. 1; FIG.
FIG. 3 is a perspective view showing the internal structure of FIG. 1 by cutting a part of the main housing and the cover; FIG.
4 is a perspective view showing a configuration of a gear assembly constituting an embodiment of the present invention.
FIG. 5 is an exploded perspective view of the structure of FIG. 4; FIG.
6 is a cross-sectional view taken along line I-I 'of FIG. 4

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The electronic parking brake actuator (hereinafter, referred to as 'actuator') according to the present invention decelerates the driving of the motor 30 to generate a large rotational force and transmits it to the outside, thereby realizing an electronic parking brake function. For this purpose, a gear assembly 50 is installed in the actuator assembly of the present invention together with the motor 30. [ The gear assembly 50 described below refers to the entire structure composed of a plurality of gears.

First, referring to FIG. 1, the actuator connects the main housing 10 and the cover 18 to form an overall outer skeleton. When the main housing 10 and the cover 18 are coupled to each other, a shielded installation space 15 is formed inside the main housing 10 and a plurality of components are installed in the installation space 15 to operate the actuator. When the main housing 10 and the cover 18 are assembled, only a part of the final output shaft 80 protruded downward from the connector portion 13 is exposed and the rest is not exposed inside the installation space 15. [ A mating connector (not shown) is inserted into the engagement space of the connector portion 13. [

As shown in FIGS. 2 and 3, the main housing 10 has a motor mounting portion 11 and a gear mounting portion 21, respectively, inside the main housing 10. Here, the motor mounting portion 11 and the gear mounting portion 21 are spaced apart from each other and have a rotation axis in a side-by-side direction. The main housing 10 is constituted by one part, and in this embodiment, a synthetic resin material is injection-molded.

The main housing 10 can be largely divided into two parts, that is, the motor mounting portion 11 and the gear mounting portion 21. Referring to FIG. 2, a motor mounting portion 11 and a gear mounting portion 21 are respectively provided at both ends of the main housing 10 extending leftward and rightward. The connector portion 13 described above is on the side of the motor mounting portion 11 and the terminal T1 incorporated in the engaging space 13 'of the connector portion 13 is connected to the motor terminal of the brush card assembly 37 And can be electrically connected to each other in contact with the second transistor T2.

In the installation space 15 on the upper portion of the main housing 10, an installation frame 40 to be described below is coupled. The mounting frame 40 serves to fix the components constituting the gear assembly 50. For example, the idle gear 51 and the final gear 53 are installed, (40). The installation space 15 extends laterally from the top of the main housing 10 and is covered by a cover 18. [

The motor mounting portion 11 has a motor housing space 12 in which a motor 30 is housed. The motor rotation shaft 31 of the motor 30 is provided with a pinion gear 35. The pinion gear 35 protrudes upward. A brush card assembly 37 is coupled to the upper portion of the motor 30, and power is supplied through the brush card assembly 37. To this end, the brush card assembly 37 has a motor terminal T2 for receiving power from the outside, and the motor terminal T2 is connected to the terminal T1 of the connector 13 described above. The commutator (not shown) changes the direction of the current flowing through the coil. The armature core constituting the motor 30 has a plurality of core plates stacked to form a three-dimensional shape, and the armature core has a substantially cylindrical shape.

The gear housing 21 of the main housing 10 has a gear accommodating space 23. The gear accommodating space 23 is provided with a ring gear 60 to be described below, and the lower portion thereof is open so that the output shaft 80 can be exposed downward. The gear accommodating space 23 is connected to the mounting space 15 described above and has a shape corresponding to the ring gear 60. Reference numeral 22 denotes a mounting bracket, and reference numeral 22 'denotes a fastening hole into which a fastening hole is inserted.

An installation frame 40 is coupled to the main housing 10. The installation frame 40 is coupled to the installation space 15 of the main housing 10 to fix the components constituting the gear assembly 50. The mounting frame 40 may be fixed to the main housing 10 through a bolt B, A motor coupling portion 42 is provided on one side of the main body 41 forming the skeleton of the installation frame 40 and a pinion gear 35 of the motor 30 protrudes therefrom. A gear groove 43 is formed at a central portion adjacent to the motor coupling portion 42 to which an idle gear shaft 52 serving as a rotation center of the idle gear 51 is coupled.

A gear engaging portion 44 is provided at a position on the mounting frame 40 opposite to the motor engaging portion 42. The gear engagement portion 44 is substantially in the shape of a ring, to which the final gear 53 and the planetary gear set 70 are coupled. A coupling hook 45 protrudes below the gear coupling portion 44. The coupling hook 45 of the ring gear 60 is engaged with the coupling hook 45 of the ring gear 60 to be described below. The coupling hooks 45 may be provided around the gear coupling portion 44. It can be seen that the planetary gear set 70 is located in the center space 44 'corresponding to the center of the gear engagement portion 44. Reference numeral 46 denotes a fastening groove 46 into which the fastening protrusion 93 of the gear cover 90 to be described below is inserted.

Referring to the gear assembly 50 installed in the installation frame 40, the idle gear 51 is positioned at the center of the installation frame 40. The idle gear 51 is connected to the motor assembly and more precisely rotates in engagement with the pinion gear 35 rotated by the motor 30. The idle gear 51 is engaged with the pinion gear 35 to change the direction of rotation and to perform the primary deceleration. The pinion gear shaft 52 rotates in a state where the primary deceleration is made between the idle gear 51 and the pinion gear 35. [ The first deceleration rate is smaller than the second deceleration rate and the third deceleration rate, which will be described below. The final gear 53 of the gear assembly 50 is engaged with the idle gear 51 so that the pinion gear 35 and the final gear 53 are rotated in the same direction. That is, the idle gear 51 connects between the pinion gear 35 and the final gear 53.

The gear assembly 50 includes a final gear 53. The final gear 53 is located at the gear engaging portion 44 of the mounting frame 40. The final gear 53 meshes with the idle gear 51 and rotates to rotate the planetary gear set (70). The final gear 53 is formed of a double gear having a first gear 54 and a second gear 57 which are different from each other in general gear shape of a substantially cylindrical shape.

Referring to FIG. 5, the final gear 53 has a first gear 54 and a second gear 57 provided on a gear body, which is a basic skeleton. The gear body has a substantially cylindrical shape, and the first gear 54 is formed on the outer peripheral surface of the gear body. The first gear 54 meshes with the idle gear 51 so that the final gear 53 is rotated.

The second gear 57 is formed on the inner circumferential surface of the first rotation space 56 recessed in the bottom surface of the gear body. The bottom surface of the gear body toward the planetary gear set 70 is recessed inwardly, and a first rotation space 56 is formed therein. And a second gear 57 is provided along the inner circumferential surface of the first rotating space 56. The second gear 57 meshes with the first planetary gears 71 and 73 of the planetary gear set 70 and allows the first planetary gears 71 and 73 to revolve simultaneously with rotation. More precisely, the first rotation space 56 can be seen as a space between the second gear 57 and the first sun gear 58 to be described later.

The final gear 53 is provided with two gears so as to engage with the idle gear 51 and rotate the first stage planetary gears 71 and 73 of the planetary gear set 70 in a wrapping state have. Therefore, the entire planetary gear set 70 is not constrained to the ring gear 60, which will be described later, so that the change of the gear ratio can be made more freely within the same package size. The first stage planetary gears 71 and 73 of the planetary gear set 70 are rotated in the first rotation space 56 to further reduce the overall package size and weight of the actuator including the gear assembly 50 .

5 and 6, the final gear 53 is provided with a first sun gear 58. The first sun gear 58 is positioned at the center of the first rotation space 56 of the final gear 53 and is engaged with the first sun gear 58 of the first planetary gears 71 and 73 constituting the planetary gear set 70 1 planetary gears 73, respectively. The first sun gear 58 and the first planetary gears 73 rotate as the first planetary gears 73 are positioned around the first sun gear 58. [ Of course, as described above, since the first planetary gears 73 are engaged with the second gear 57 located outside the first rotating space 56, the first sun gear 58 is meshed with the first sun gear 58 And at the same time, the outer side is engaged with the second gear 57 and rotated. 6 shows the gear cover 90, which is omitted in FIG. 4, but the gear cover 90 is shown as the first sun gear 58 of the final gear 53, To the top of the frame. 3 and 6, the upper portion of the first sun gear 58 passes through the final gear 53 and is fixed to the gear cover 90. As shown in FIG. Therefore, the first sun gear 58 can maintain a fixed state without rotating together when the final gear 53 rotates. The first sun gear 58 may be made of a separate material from the final gear 53 and then assembled into the gear cover 90 in a keyway structure.

Below the gear assembly 50, there is a ring gear 60. The ring gear 60 is housed in the gear mounting portion 21 of the main housing 10 and is housed in the gear mounting portion 21 while being coupled to the mounting frame 40 described above. The ring gear 60 is substantially cylindrical in shape and has an annular gear 63 on the inner surface thereof. The coiler 63 rotates the second stage planetary gears 75 and 76 of the planetary gear set 70 described below. The ring gear 60 is made of water separate from the main housing 10 and the mounting frame 40, and thus can be separated.

On the outer peripheral surface of the ring gear 60, there is a coupling step 65. The coupling jaw 65 protrudes from the outer circumferential surface of the ring gear 60 and is a portion to which the coupling hook 45 of the installation frame 40 described above is caught. When the coupling hook 45 is engaged with the coupling step 65, the ring gear 60 can be fixed to the mounting frame 40. The planetary gear set 70 can be inserted upward and the output shaft 80 can be projected downward. The inside of the ring gear 60 becomes the second rotation space 64 and the second planetary gears 75 and 76 of the planetary gear set 70 can be rotated.

The gear assembly 50 includes a planetary gear set 70. The planetary gear set 70 includes a plurality of planetary gears to perform a deceleration function. In the present invention, the planetary gear set 70 has a two-stage deceleration function. The first planetary gears 71 and 73 and the second planetary gears 75 and 76 are stacked on the planetary gear set 70 to perform two-stage reduction and three-stage reduction. The planetary gear set 70 is installed on the gear mounting portion 21 of the main housing 10 and is rotated in a state surrounded by the final gear 53 and the ring gear 60 as described below .

The first and second rotation spaces 56 and 64 are provided with a first rotation space 56 and a second rotation space 64 respectively in the final gear 53 and the ring gear 60, Connected to create a single rotating space. The planetary gear set 70 is accommodated in the rotation space. More precisely, as shown in FIG. 6, the A zone formed by the first rotation space 56 and the B zone formed by the second rotation space 64 are connected to each other, and the planetary gear set 70 is accommodated therein , The first stage planetary gears 71 and 73 are located in the first rotating space 56 which is relatively upper and the second stage planetary gears 75 and 76 are located in the second rotating space 64 which is relatively lower do.

The planetary gear set 70 includes the first planetary gears 71 and 73 and the second planetary gears 75 and 76. The planetary gear set 70 includes the first planetary gear set 70, The gears 71 and 73 are rotated by engaging with the second gear 57 and the first sun gear 58 of the final gear 53 and the second stage planetary gears 75 and 76, (63) of the rotor (60). The first-stage planetary gears 71 and 73 and the second-stage planetary gears 75 and 76 are stacked on top of each other and rotate to perform a deceleration function.

The first planetary gears 71 and 73 of the planetary gear set 70 include a first carrier 71 rotated about the main gear shaft 55 and a plurality of A first planetary gear 73 connected to the axes of the first planetary gears 73 and housed in the first rotation space 56 of the final gear 53 to rotate in engagement with the first sun gear 58, . The first planetary gear 73 revolves around the first planetary gear shaft 74 and revolves with the first carrier 71 in the first rotation space 56. The first planetary gears 73 engaged with the second gear 57 of the final gear 53 and the first sun gear 58 revolve the first carrier 71, The second order deceleration is performed.

As shown in FIG. 5, the second sun gear 72 protrudes from the first carrier 71. The second sun gear 72 protrudes downward from the center of the first carrier 71 and rotates integrally with the first carrier 71. The second sun gear 72 serves to rotate a second planetary gear 76 to be described later and the second planetary gears 76 surround the second sun gear 72, When the gear 72 rotates, the second planetary gears 76 rotate.

The second planetary gears 75 and 76 have a structure similar to that of the first planetary gears 71 and 73. More specifically, the planetary gears 75 and 76 rotate about the main gear shaft 55, A second carrier 75 positioned in the second rotation space 64 of the ring gear 60 corresponding to a lower portion of the first planetary gear 71, and a second planetary gear 76. The second planetary gears 76 are connected to a second planetary gear shaft 77 provided on the second carrier 75, respectively. The second planetary gears 76 are disposed around the second planetary gear shaft 77 and are accommodated in the second rotation space 64 of the ring gear 60, And is engaged in the third gear 63 while being revolved. The third decelerated rotational motion is transmitted to the outside through the output shaft 80 connected to the main gear shaft 55.

Thus, the planetary gear set 70 of the present invention wraps and engages with each other in a narrow installation space formed by the first rotation space 56 of the final gear 53 and the second rotation space 64 of the ring gear 60 The entire package is reduced and only the second stage planetary gears 75 and 76 of the planetary gear set 70 are restrained to the ring gear 60 so that the change of the gear ratio can be made more freely within the same package size . For example, when the second gear 57 or the first sun gear 58 is replaced with a different final gear 53, and the first-stage planetary gears 71 and 73 corresponding thereto are used, the second- .

The gear assembly 50 is shielded by a gear cover 90. As shown in FIGS. 1 to 3, the gear cover 90 is assembled to the mounting frame 40 to shield the gear assembly 50. A fastening protrusion 93 protrudes from the bottom cover 18 and the fastening protrusion 93 is engaged with the fastening groove 46 of the mounting frame 40. The gear cover 90 can be assembled to the mounting frame 40 by the fastening protrusion 93 and the fastening groove 46.

Hereinafter, the operation of the electronic parking brake actuator having the double gear according to the present invention will be described.

First, when external power is supplied through the connector unit 13, the motor 30 operates. The operation of the motor 30 rotates the shaft of the motor 30, and the pinion gear 35 on the shaft of the motor 30 rotates. The pinion gear 35 rotates about the axis of the motor 30 as a rotation axis, and rotates the idle gear 51 engaged with the pinion gear 35 in the opposite direction. At this time, primary deceleration is performed between the idle gear 51 and the pinion gear 35. [

The pinion gear 35 rotates in the state where the primary deceleration and the rotation direction are switched and the final gear 53 rotates due to the first gear 54 of the final gear 53 engaged with the pinion gear 35. [ When the final gear 53 rotates, the first sun gear 58 at the center of the first rotation space 56 of the final gear 53 and the second gear 57 at the inner circumference rotate the planetary gear set 70 . More precisely, the second gear 57 and the first sun gear 58 operate the first stage planetary gears 71 and 73 of the planetary gear set 70, and a total of three first planetary gears 73 Rotates (rotates) about the axis of the first planetary gear 73 at the same time while rotating (revolving) by engaging with the second gear 57 and the first sun gear 58. The first carrier 71 rotates in the idle state of the first planetary gears 73. In this process, a second-order deceleration occurs.

On the other hand, when the first carrier 71 rotates, the second sun gear 72 in the first carrier 71 rotates the second planetary gears 75, 76. The second planetary gears 76 surrounding the second sun gear 72 rotate in engagement with the second sun gear 72 and the second planetary gears 76 rotate the second planetary gear shaft 77 And at the same time engaged with the idler gear 63 of the ring gear 60 to revolve. In this process, the second carrier 75 rotates. In this way, the third-order deceleration occurs in the course of the rotation of the second-stage planetary gears 75, 76.

As described above, in the present invention, the entire two planetary gear sets 70 constituting the gear assembly 50 are not engaged with the ring gear 60, and the first-stage planetary gears 71 and 73 are engaged with the final gear 53 And the second stage planetary gears 75 and 76 engage with the ring gear 60 and rotate. Therefore, since the planetary gear set 70 as a whole is not constrained to the ring gear 60, it is possible to freely change the gear ratio within the same package size, and thus the design freedom can be enhanced.

Finally, since the main rotating shaft 55 is fixed to the second carrier 75, the main rotating shaft 55 rotates together with the second carrier 75. [ At the lower end of the main rotation shaft 55, there is an output shaft 80, and the output shaft 80 finally provides a rotational force to the outside. That is, power is transmitted to the outside through the rotation of the final output shaft 80, and electronic parking is performed.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: main housing 11: motor mounting part
13: connector portion 21: gear mounting portion
30: motor 35: pinion gear
40: mounting frame 50: gear assembly
51: Idle gear 53: Final gear
54: first gear 58: first sun gear
60: Ring gear 63: Borehole pitch
70: planetary gear set 71: first carrier
72: second sun gear 73: first planetary gear
75: second carrier 76: second planetary gear
80: Output shaft

Claims (7)

A main housing having a motor mounting portion and a gear mounting portion,
A motor assembly installed in the motor mounting portion and providing a rotational force;
And a gear assembly that rotates by a rotational force of the motor assembly and performs an acceleration function through a plurality of gears,
The gear assembly
An idle gear connected to the motor assembly,
A first gear which is detachably installed on the gear mounting portion and is formed on an outer surface of the pinion gear, a final gear rotatably engaged with the idle gear,
A ring gear mounted on the gear mounting portion corresponding to a lower portion of the final gear and detachably fixed to a mounting frame provided on the main housing,
The first planetary gear disposed at the upper portion is rotated by engaging with the second gear of the final gear and the second planetary gear disposed at the lower portion is rotated by the planetary gear of the ring gear, And a planetary gear set rotating in engagement with the electric gear,
The final gear
A gear body,
A first gear formed on an outer peripheral surface of the gear body and engaged with the idle gear,
A second gear which is formed on an inner circumferential surface of a first rotation space and is engaged with a first planetary gear of the planetary gear set,
And a first sun gear projecting to a position corresponding to the center of the first rotating space.
2. The method of claim 1, wherein when the final gear and the ring gear are stacked, the first rotation space of the final gear and the second rotation space formed inside the ring gear are connected to each other to form one rotation space, Wherein the planetary gear set includes a double gear which accommodates the planetary gear set.
3. The planetary gear set according to claim 2, wherein the first planetary gear and the second planetary gear of the planetary gear set are stacked and rotated at the same rotational axis, And the second-stage planetary gear has a double gear rotated in a second rotation space of the ring gear.
4. The planetary gear set according to claim 3, wherein the first planetary gear of the planetary gear set
A first carrier rotated about a main gear shaft and having a second sun gear at its center,
And a first planetary gear connected to the plurality of first planetary gear shafts provided in the first carrier and accommodated in a first rotation space of the final gear and rotated in engagement with the second gear,
The second-stage planetary gear
A second carrier which rotates about the main gear shaft and is located in the ring gear second rotation space corresponding to a lower portion of the first carrier,
A plurality of second planetary gear shafts provided in the second carrier, each of the plurality of second planetary gear shafts being rotatable by the second sun gear, housed in a second rotation space of the ring gear, Electronic parking brake actuator with double gear including planetary gears.
The vehicle according to claim 1, wherein the main housing is provided with an installation frame, the idle gear and the final gear are installed on the installation frame, and the ring gear is detachably assembled to the lower part of the installation frame, An electronic parking brake actuator having a double gear housed in a gear mounting portion of a main housing.
[6] The apparatus of claim 5, wherein the first sun gear of the final gear is provided at the center of the first rotation space of the final gear, and the first sun gear is made of water separate from the final gear, And the gear cover covering the mounting frame has a double gear rotatably supporting an upper end of the first sun gear projected to an upper portion of the final gear.


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