KR102528504B1 - Actuator assembly - Google Patents

Abstract

The actuator assembly of one embodiment of the present disclosure includes a housing forming an exterior, a motor fixed to the housing, a first worm rotating by receiving power from the motor, and disposed in a direction perpendicular to the axis of rotation of the first worm to rotate the first worm A second worm that rotates in conjunction with the second worm, a driven gear disposed in a direction orthogonal to the axis of rotation of the second worm and rotated in conjunction with the second worm, a reduction gear and a reduction gear that receive, reduce, and transmit power from the driven gear It includes an output shaft that receives power from and rotates, and the reduction gear includes a sun gear that is coupled to the driven gear and rotates together, a plurality of planetary gears that rotate in conjunction with the sun gear, and a ring in which the plurality of planetary gears mesh and revolve inside. The housing includes a ring gear mounting portion including a first concave-convex portion protruding toward the center of the ring gear and a second concave-convex portion protruding outwardly of the ring gear, in a space in which the ring gear is mounted, The ring gear includes a fixing protrusion formed on an outer circumferential surface and inserted into the second concave-convex portion, and is detachably fixed to the ring gear mounting portion.

Description

Actuator assembly {ACTUATOR ASSEMBLY}

The present disclosure relates to an actuator assembly, and more particularly, to an actuator assembly for an electronic parking brake.

An actuator assembly is a device or system that performs mechanical work by receiving power from a power source such as a motor or a hydraulic device, and is used in various industrial fields. For example, the actuator assembly may include a plurality of gears and may change the direction of power of the motor or increase or decrease the intensity of power and transmit the power to the outside according to the number of teeth, module, pitch, and arrangement structure of the gears.

In the conventional actuator assembly, the structure of the entire housing had to be changed according to the gear change in order to adjust the reduction ratio of the power of the motor, so there was a problem in that the housing had to be newly manufactured. In addition, as a plurality of gears are overlapped inside the housing to miniaturize the actuator assembly, it is difficult to replace internal parts, and there is a problem that noise is generated or power transmission efficiency is lowered due to coupling play between internal parts did

In order to solve the above-mentioned problems, the actuator assembly of the present disclosure aims to improve the component arrangement and coupling structure inside the housing, and to provide a structure in which separation and replacement of some components are easy.

The actuator assembly of one embodiment of the present disclosure includes a housing forming an exterior, a motor fixed to the housing, a first worm rotating by receiving power from the motor, and disposed in a direction perpendicular to the axis of rotation of the first worm A second worm that rotates in conjunction with the first worm, a driven gear disposed in a direction perpendicular to the axis of rotation of the second worm and rotated in conjunction with the second worm, and receiving power from the driven gear to increase or decrease It includes a reduction gear that transmits power and an output shaft that rotates by receiving power from the reduction gear, wherein the reduction gear includes a sun gear that is coupled to the driven gear and rotates together, a plurality of planetary gears that rotate in conjunction with the sun gear, and The plurality of planetary gears include a ring gear that engages and revolves therein, and the housing is a space in which the ring gear is mounted, and a first concave-convex portion protrudes toward the center of the ring gear and an outer direction of the ring gear. A ring gear mounting portion including a second concave-convex portion protruding into the ring gear mounting portion, wherein the ring gear includes a fixing protrusion formed on an outer circumferential surface and inserted into the second concave-convex portion to be detachably fixed to the ring gear mounting portion. there is.

In this case, it may include a sun gear pin provided on the rotation shaft of the driven gear and the sun gear, and coupled to the sun gear by a press-fitting method.

Meanwhile, the driven gear is made of a thermoplastic material, and the driven gear and the sun gear may be closely coupled by an insert injection method.

Meanwhile, the sun gear may be spaced apart from the ring gear and disposed above the ring gear.

On the other hand, it is coupled or separated from the housing and provided between the motor cover and the motor cover supporting the lower portion of the motor and the motor cover to distribute the pressure of the lower portion of the motor and to prevent separation of the motor cover may include a wave washer there is.

Meanwhile, a carrier may include a carrier to which the plurality of planetary gears are coupled and fixed to an upper surface and to which the output shaft is coupled to a lower surface to rotate together by revolution of the plurality of planetary gears.

In this case, the carrier may be integrally molded with the output shaft to form a single body.

On the other hand, the ring gear includes a first ring gear having a first gear number of teeth and a second ring gear having a second gear number different from the first gear number of teeth, and the first ring gear and the second ring gear A fixing protrusion having the same shape as each other may be formed.

Meanwhile, the driven gear includes a plurality of grooves formed on an upper surface, and the plurality of grooves have a structure recessed into the driven gear to reduce the self-weight of the driven gear.

Meanwhile, a cover may be detachably coupled to the upper surface of the housing and rotatably fixing the driven gear.

Meanwhile, the housing may form a second worm fixing part formed adjacent to the ring gear mounting part, and the ring gear mounting part and the second worm fixing part may be formed as one body.

1 is a perspective view of an actuator assembly according to an embodiment of the present disclosure.
2 is an exploded perspective view of an actuator assembly according to an embodiment of the present disclosure.
3 is a plan view of a housing according to an embodiment of the present disclosure.
4 is a perspective view of a ring gear according to an embodiment of the present disclosure.

Terms used in this specification will be briefly described, and the present disclosure will be described in detail.

The terms used in the embodiments of the present disclosure have been selected from general terms that are currently widely used as much as possible while considering the functions in the present disclosure, but they may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. . In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the disclosure. Therefore, terms used in the present disclosure should be defined based on the meaning of the term and the general content of the present disclosure, not simply the name of the term.

Embodiments of the present disclosure may apply various transformations and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the scope to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of technology disclosed. In describing the embodiments, if it is determined that a detailed description of a related known technology may obscure the subject matter, the detailed description will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, "comprising." or "made up." The terms such as are intended to specify that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features or numbers, steps, operations, components, parts, or It should be understood that it does not preclude the possibility of existence or addition of combinations thereof.

In an embodiment of the present disclosure, a 'unit' or 'unit' performs at least one function or operation, and may be implemented as hardware or software or a combination of hardware and software. In addition, a plurality of 'units' or a plurality of 'units' may be integrated into at least one unit and implemented by at least one processor, except for 'units' or 'units' that need to be implemented with specific hardware.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily carry out the present disclosure. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. And in order to clearly describe the present disclosure in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Hereinafter, the present disclosure will be described in more detail with reference to FIGS. 1 to 4 .

1 is a perspective view of an actuator assembly 100 according to one embodiment of the present disclosure.

Referring to FIG. 1 , an actuator assembly 100 according to an embodiment of the present disclosure may include a housing 101 and a cover 113 .

The actuator assembly 100 is a device or system that performs mechanical work using various power sources, for example, electricity, hydraulic pressure, etc., and may include a housing 101 forming an exterior and a plurality of parts disposed therein. can

The actuator assembly 100 of one embodiment may be a device that receives power from the motor 104, increases or decreases the power to the output shaft 130, and changes the direction of the power, and may be used as an electronic parking brake device of a vehicle.

The housing 101 forms the exterior of the actuator assembly 100, and a plurality of parts may be installed inside or outside the housing 101. The housing 101 prevents foreign substances from entering from the outside and can protect internal components.

The housing 101 may include a connector 140 having an opening 141 formed therein, and the motor 104 may receive electrical signals or power from the outside through the opening 141 of the connector 140 .

The actuator assembly 100 according to one embodiment of the present disclosure may be implemented as a coupling structure of the housing 101 and the cover 113. In this case, the actuator assembly 100 may protect and/or fix the motor 104 and internal components by installing the internal components including the motor 104 inside the housing 101 and then fastening the cover 113 thereto. there is.

Since the actuator assembly 100 includes the cover 113, the actuator assembly 100 can easily manage the internal parts by removing the cover 113, inspecting or replacing internal parts, and fastening the cover 113 again. can

2 is an exploded perspective view of the actuator assembly 100 according to an embodiment of the present disclosure.

Referring to FIG. 2 , the actuator assembly 100 of one embodiment of the present disclosure includes a motor 104, a first worm 106, a second worm 108, a driven gear 116 and a ring gear 109 can do.

The motor 104 is installed inside the housing 101 and receives power or electrical signals through the first terminal 102 and the second terminal 103 connected through the connector 140, and the first worm 106 can generate power to rotate. At the bottom of the motor 104, the motor cover 105 is coupled to or separated from the housing 101 and supports the lower part of the motor 104, and the pressure applied to the lower part when the motor 104 is driven is dispersed and the motor 104 A wave washer 119 preventing separation of the motor cover 113 due to vibration of the may be provided.

The housing 101 of the present disclosure has a structure in which the motor 104 is coupled or separated from the lower part of the housing through the motor cover 104, so that various gear structures disposed in the upper direction of the housing 101 are disposed in the arrangement structure flexibility can be obtained.

The first worm 106 is coupled to the rotation axis of the motor 104 and can rotate together with the rotation axis. The first worm 106 may receive power from the motor 104 and transmit it to the second worm 108 .

The second worm 108 is disposed in a direction orthogonal to the axis of rotation of the first worm 106, and receives power from the first worm 106 to rotate in a direction orthogonal to the axis of rotation of the first worm 106 It rotates as an axis and can change the power direction of the first worm 106. The second worm 108 may be rotatably coupled to the housing 101 through the first bush 110 and the bearing 112 .

The second worm 108 may include a worm wheel 107 that rotates in interlock with the first worm 106, and the second worm 108 controls the direction and strength of the power of the first worm 106. It can be increased or decreased and transmitted to the driven gear 116.

The driven gear 116 is disposed in a direction orthogonal to the axis of rotation of the second worm 108, and may engage and rotate with the second worm 108. The driven gear 116 receives power from the second worm 108 and rotates in a direction orthogonal to the rotation axis of the second worm 108 as a rotation axis, and can change the power direction of the second worm 108 there is. The driven gear 116 may be rotatably coupled to the cover 113 of the housing 101 through the second bush 114 .

The reduction gears 109, 115, and 117 may include a sun gear 117, a plurality of planetary gears 115, and a ring gear 109, and receives power from the driven gear 116 according to a predetermined reduction ratio. Power may be decelerated and transmitted to the output shaft 130 . In this case, the predetermined reduction ratio may be determined by the number of gear teeth, pitch, or layout of the sun gear 117, the plurality of planetary gears 115, and the ring gear 109.

The sun gear 117 is coupled to the lower part of the driven gear 116, rotates together with the driven gear 116, and engages with a plurality of planetary gears 115 (or 'planet gear') to form a plurality of planetary gears 115 can be rotated. The sun gear 117 may be spaced apart from the ring gear 109 and disposed above the ring gear 109 .

In one embodiment of the present disclosure, the driven gear 116 may be made of a thermoplastic material, for example, plastic resin, and the sun gear 117 is coupled to the driven gear 116 by an insert injection method to be tightly coupled integrally. can

A plurality of grooves may be formed on an upper surface of the driven gear 116, and the inside of the plurality of grooves may be formed as an empty space to reduce the self-weight of the driven gear 116. When the weight of the driven gear 116 is reduced, the inertia of the driven gear 116 can be reduced, and the weight reduction effect of the entire actuator assembly 100 can be expected.

A sun gear pin 118 is provided at the center of the sun gear 117, and the sun gear pin 118 may be a rotation shaft of the driven gear 116 and the sun gear 117. In one embodiment, the sun gear pin 118 and the sun gear 117 may be coupled by a press fit method. Through this, it is possible to minimize the clearance between the sun gear pin 118 and the sun gear 117, increase power transmission efficiency and reduce noise.

The plurality of planetary gears 115 may be disposed below the sun gear 117 in a structure surrounding the sun gear pin 118, and may rotate while being engaged with the sun gear 117, respectively. In addition, a ring gear 109 may be disposed outside the plurality of planetary gears 115, and the ring gear 109 may have a structure surrounding the plurality of planetary gears 115. In addition, the plurality of planetary gears 115 are rotated by meshing with the ring gear 109 internally, and may revolve inside the ring gear 109 .

Each of the plurality of planetary gears 115 may be coupled to and fixed to the upper surface of the carrier 111, and the carrier 111 may be rotated by revolution of the plurality of planetary gears 115. In addition, an output shaft 130 is formed below the carrier 111, and the output shaft 130 rotates to transmit power to the outside. The carrier 111 may be integrally molded together with the output shaft 130 to form a single body.

The actuator assembly 100 of one embodiment includes a second worm 108, a second worm wheel 116, a plurality of planetary gears 115 and a ring gear 109, depending on their shape and arrangement, the motor 104 The direction of power transmitted from ) can be changed and the magnitude of power can be increased or decreased, and the output shaft 130 is connected to a caliper brake for a vehicle, so that the actuator assembly 100 can be applied to a parking brake system.

3 is a plan view of a housing 101 according to an embodiment of the present disclosure.

Referring to FIG. 3 , a housing 101 according to an embodiment of the present disclosure may include a second worm fixing part 121 and a ring gear mounting part 122 .

The housing 101 may have an open top surface when the cover 113 is separated, and the first terminal 102 and the second terminal 103 are inserted into the housing 101 through the connector 140. ) may be electrically connected to the motor 104. The motor 104 may rotate the first worm 106 in a vertical direction in the plan view of FIG. 3 as a rotation axis.

The second worm fixing part 121 may fix the second worm 108 to rotate with the rotation axis in a direction orthogonal to the rotation axis of the first worm 106, that is, in a direction horizontal to the plan view of FIG. 3, The second worm 108 may be rotatably coupled to the housing 101 through the first bush 110 and the bearing 112 .

The ring gear 109 may be seated on the ring gear mounting portion 122, and the first concave-convex portion 122-1 protrudes toward the center of the ring gear 109 and the ring from the first concave-convex portion 122-1. A second concave-convex portion 122-2 protruding outward of the gear 109 may be included.

4 is a perspective view of a ring gear 109 according to one embodiment of the present disclosure.

Referring to FIG. 4 , a ring gear 109 according to an embodiment of the present disclosure may include an outer circumferential surface 123-2 and a fixing protrusion 123-1.

The outer circumferential surface 123-2 and the fixing protrusion 123-1 of the ring gear 109 have a concave-convex structure of the first concave-convex portion 122-1 and the second concave-convex portion 122-2 of the ring gear mounting portion 122. may have a structure corresponding to The fixing protrusion 123-1 is inserted into and fixed to the second uneven portion 122-2, so that the ring gear 109 can be coupled to the ring gear mounting portion 122 in a fixed state so as not to rotate.

The ring gear 109 is coupled to the ring gear mounting portion 122 of the housing 101 through the outer circumferential surface 123-2 and the fixing protrusion 123-1, so that the housing 101 has an outer diameter of the ring gear mounting portion 122. can be reduced, the coupling structure of the ring gear 109 can be simply improved, and the overall volume of the actuator assembly 100 can be reduced to realize miniaturization.

For example, the ring gear 109 may include a first ring gear having a first number of teeth and a second ring gear having a second number of teeth different from the number of teeth of the first gear, and the first ring gear and the second ring gear. The two ring gears may be selectively and interchangeably coupled to the ring gear mounting portion 122 by including the same outer circumferential surface 123-2 and fixing protrusion 123-1. Therefore, the actuator assembly 100 can easily replace the plurality of ring gears 109 and easily change the adjustment ratio of the output shaft.

The ring gear 109 of one embodiment of the present disclosure may have a separable structure that can be easily coupled to and separated from the ring gear mounting portion 122 of the housing 101 . The separable structure can solve the problem of dimensional defects of the ring gear 109 that may occur due to shrinkage and deformation when the housing 101 and the ring gear 109 are integrally formed.

The actuator assembly 100 includes gear parts of various structures described above, for example, the first worm 106 and the second worm ( 108), the driven gear 116, the sun gear 117, the plurality of planetary gears 115, and the ring gear 109 may be replaced by changing the number of teeth, module, pitch radius, etc. of at least one gear.

For example, in order to increase the reduction ratio of the motor, the number of teeth of at least one of the reduction gear sun gear 117, the plurality of planetary gears 115 and the ring gear 109 is increased or the pitch radius is increased. can make it

In the actuator assembly 100 of the present disclosure, the ring gear 109 can be fixed or separated from the ring gear mounting portion 122 of the housing 101 through the fixing protrusion 123-1, and as a result, it can be easily assembled even after assembly. The ring gear 109 can be separated from the housing 101 and replaced, and the number of teeth and layout of the sun gear 117, the plurality of planetary gears 115, and the ring gear 109 can be changed without replacing the entire housing 101. By adjusting, the output of the output shaft 130 can be adjusted.

In addition, although the preferred embodiments of the present disclosure have been shown and described above, the present disclosure is not limited to the specific embodiments described above, and the technical field to which the disclosure belongs without departing from the subject matter of the present disclosure claimed in the claims. Of course, various modifications are possible by those skilled in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present disclosure.

100: actuator assembly 101: housing
104: motor 106: first worm
108: second worm 109: ring gear
116: driven gear 130: output shaft

Claims (11)

a housing forming an exterior;
a motor fixed to the housing;
A first worm that rotates by receiving power from the motor;
a second worm arranged in a direction perpendicular to the axis of rotation of the first worm and rotating in conjunction with the first worm;
a driven gear arranged in a direction orthogonal to the axis of rotation of the second worm and rotating in conjunction with the second worm;
a reduction gear that receives, reduces, and transmits power from the driven gear; and
An output shaft that receives power from the reduction gear and rotates;
The reduction gear,
a sun gear coupled to the driven gear and rotating together;
a plurality of planetary gears rotating in conjunction with the sun gear; and
Including; a ring gear in which the plurality of planetary gears are engaged and revolving therein,
the housing,
A space in which the ring gear is mounted, including a ring gear mounting portion including a first concave-convex portion protruding toward the center of the ring gear and a second concave-convex portion protruding outwardly of the ring gear;
The ring gear,
A fixing protrusion formed on an outer circumferential surface and inserted into the second concave-convex portion is detachably fixed to the ring gear mounting portion;
The ring gear includes one selected from a first ring gear having a number of teeth of the first gear and a second ring gear having a number of teeth of a second gear different from the number of teeth of the first gear,
The first ring gear and the second ring gear are formed with fixed protrusions of the same shape and are coupled to the ring gear mounting portion to be replaced.
The actuator assembly of claim 1 , wherein the number of second protrusions formed on the ring gear mounting portion is greater than the number of fixing protrusions formed on the ring gear. According to claim 1,
A sun gear pin provided on the rotational shaft of the driven gear and the sun gear, and coupled to the sun gear by a press-fitting method; including, an actuator assembly. According to claim 1,
The driven gear is made of a thermoplastic material,
The actuator assembly, wherein the driven gear and the sun gear are closely coupled by an insert injection method. According to claim 1,
The actuator assembly of claim 1, wherein the sun gear is spaced apart from the ring gear and disposed on top of the ring gear. According to claim 1,
a motor cover coupled or separated from the housing and supporting a lower portion of the motor; and
A wave washer provided between the motor and the motor cover to distribute the lower pressure of the motor and prevent separation of the motor cover; including a, the actuator assembly. According to claim 1,
An actuator assembly comprising: a carrier to which the plurality of planetary gears are coupled and fixed to an upper surface, and to which the output shaft is coupled to a lower surface to rotate together by revolution of the plurality of planetary gears. According to claim 6,
The actuator assembly, wherein the carrier is integrally molded with the output shaft to form a single body. delete According to claim 1,
The driven gear includes a plurality of grooves formed on an upper surface,
The plurality of grooves have a structure hollowed into the driven gear to reduce the self-weight of the driven gear. According to claim 1,
An actuator assembly comprising a; cover detachably coupled to the upper surface of the housing and rotatably fixing the driven gear. According to claim 1,
the housing,
Forming a second worm fixing portion formed adjacent to the ring gear mounting portion;
The actuator assembly, wherein the ring gear mounting portion and the second worm fixing portion are formed as one body.

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