KR20230160636A - Actuator for vehicle - Google Patents

Abstract

The present invention relates to an actuator for a vehicle that can reduce the manufacturing cost and miniaturize the product by reducing the number of parts and improving assembly, comprising a housing equipped with a motor and a power transmission device that transmits the rotational power of the motor to an output unit. The power transmission unit includes a drive gear coupled to the rotation shaft of the motor to rotate, a transmission gear unit engaged with the drive gear, a sun gear unit engaged with the transmission gear unit, and externally meshed with the sun gear unit. It includes a plurality of planetary gears rotating around a planetary gear rotation axis provided in the output unit, and a ring gear meshed with the planetary gears so that they are internally contacted and integrally formed inside the housing. With this configuration, the number of parts can be reduced compared to before, improving assembly efficiency, reducing manufacturing costs, and miniaturizing the product.

Description

Actuator for vehicles {ACTUATOR FOR VEHICLE}

The present invention relates to an actuator for a vehicle, and more specifically, to an actuator for a vehicle that can reduce manufacturing costs and miniaturize the product by reducing the number of parts and improving assembling.

In general, an actuator is a driving device that moves a rotatably installed member or a sliding member, such as a driving device that opens and closes a door installed inside the duct of an air conditioner, and a parking brake device that restrains the wheels of a vehicle. It is a driving device that is widely used in devices for automatically applying driving force, such as a driving device for friction members and a driving device for raising and lowering a vehicle window.

In particular, the actuator installed in the electronic parking brake device must maintain a state in which the friction member restrains the rotation of the wheel, so the driving force must be transmitted to the output shaft of the actuator even after the brake device is activated.

In addition, since the vehicle must be prevented from moving due to slip of the friction member after the operation of the brake device starts, the driving force transmitted from the actuator to the friction member requires a high output driving force of more than a predetermined value.

In relation to this, Republic of Korea Patent Publication No. 2010-0043776 discloses a sun shade power transmission device for a vehicle that generates power through a combination of a drive motor and a plurality of gears.

Such a conventional electric transmission device is constructed by combining a plurality of gears between the drive motor and the output shaft to generate high output driving force, so there is a problem in that the structure is complicated and the volume of the transmission device is large.

Republic of Korea Patent Publication No. 2010-0043776 (2010.04.29.)

The present invention was created to solve the above problems, and its purpose is to provide an actuator for vehicles that can reduce the manufacturing cost and miniaturize the product by reducing the number of parts and improving assembling.

In order to achieve the above object, an actuator for a vehicle according to a preferred embodiment of the present invention includes a housing provided with a motor; and a power transmission unit provided in the housing and transmitting the rotational power of the motor to an output unit.

Here, the power transmission unit includes a drive gear coupled to the rotation shaft of the motor and rotating; a transmission gear unit engaged with the drive gear and provided to rotate in the housing; a sun gear unit engaged with the transmission gear unit and provided to rotate in the housing; a plurality of planetary gears externally engaged with the sun gear unit and rotating around a planetary gear rotation axis provided in the output unit; and a ring gear meshed with the planetary gear to be in internal contact and integrally formed on the inside of the housing.

And, the housing includes: a housing body in which the motor is accommodated, the output unit and the power transmission unit are rotatably fastened, and the ring gear is formed; and a housing cover coupled to the housing body to cover the power transmission unit so that it is not exposed to the outside, and to which the power transmission unit is rotatably fastened.

The transmission gear unit includes a transmission gear rotation shaft, one end of which is fastened to the housing main body, and the other end of which is fastened to the housing cover; A transmission gear input unit that is rotatably inserted into the transmission gear rotation shaft and meshes with the drive gear to receive rotational power; and a transmission gear output portion that protrudes in the axial direction from the transmission gear input portion, is formed with a smaller diameter than the transmission gear input portion, and engages the sun gear portion to transmit rotational power.

The sun gear unit includes a sun gear rotation shaft whose one end is fastened to the housing cover; a sun gear input unit that is rotatably inserted into the sun gear rotation shaft and meshes with the transmission gear unit to receive rotational power; and a sun gear output unit that protrudes in the axial direction from the sun gear input unit, is formed with a smaller diameter than the sun gear input unit, and transmits rotational power by engaging the planetary gear.

Here, the sun gear output portion may further include a sun gear fastening flange portion that extends in the radial direction from one end and is formed to have a polygonal plane.

In this case, the sun gear fastening flange part is formed integrally with the sun gear input part through insert injection, and relative rotation is restricted by the corner portion of the sun gear fastening flange part.

In addition, the output unit includes a base plate rotatably mounted on the housing body so as to be concentric with the ring gear; a planetary gear rotation shaft that protrudes in the axial direction from one surface of the base plate and into which the plurality of planetary gears are respectively inserted to rotate; and an output gear that protrudes in the axial direction from one surface of the base plate, has a diameter smaller than that of the base plate, and transmits rotational power to the outside.

Here, the output gear may further include an output gear fastening flange portion extending radially from one end and having a polygonal plane.

In this case, the output gear fastening flange portion may be formed integrally with the base plate through insert injection, and relative rotation may be restricted by the corner portion of the output gear fastening flange portion.

According to the vehicle actuator according to the present invention, the number of parts can be reduced compared to the prior art, resulting in improved assembly, reduced manufacturing costs, and miniaturization of the product.

1 is a perspective view schematically showing an actuator for a vehicle according to an embodiment of the present invention;
Figure 2 is an exploded perspective view schematically showing a vehicle actuator according to an embodiment of the present invention;
3 is an exploded plan view schematically showing a vehicle actuator according to an embodiment of the present invention;
4 is an exploded cross-sectional view schematically showing a vehicle actuator according to an embodiment of the present invention;
Figure 5 is a perspective view schematically showing a sun gear portion extracted from a vehicle actuator according to an embodiment of the present invention;
Figure 6 is a perspective view schematically showing the sun gear output part extracted from the vehicle actuator according to an embodiment of the present invention;
Figure 7 is a perspective view schematically showing an output portion extracted from a vehicle actuator according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted as including all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries can be interpreted as having meanings consistent with the meanings they have in the context of related technologies, and unless clearly defined in this application, are interpreted as having an ideal or excessively formal meaning. It may not work.

Hereinafter, specific embodiments of the present invention will be described with reference to the attached drawings.

1 and 2 are a perspective view and an exploded perspective view schematically showing an actuator for a vehicle according to an embodiment of the present invention, and FIGS. 3 and 4 are an exploded plan view and an exploded cross-sectional view schematically showing the actuator for a vehicle. 5 is a perspective view schematically showing the sun gear output section extracted from the vehicle actuator, Figure 6 is a perspective view schematically showing the sun gear output section extracted from the vehicle actuator, and Figure 7 is a schematic view showing the output section extracted from the vehicle actuator. This is a perspective view shown as .

1 to 7, a vehicle actuator 100 according to an embodiment of the present invention includes a housing 200 provided with a motor 110 that generates rotational power, and the housing 200 is provided and the motor It includes a power transmission unit 300 that transmits the rotational power of 110 to the output unit 400.

Here, the output unit 400 is connected to the object and transmits the rotational power received from the power transmission unit 300 to cause the object to operate.

The housing 200 includes a housing body 210 with one side open and a receiving portion formed therein to accommodate the motor 110, the power transmission unit 300, and the output unit 400; ) may include a housing cover 220 fastened to the open side.

The housing body 210 includes a motor accommodating part 211 in which the motor 110 is housed, and an output part formed adjacent to the motor accommodating part 211 and on which the output part 400 is rotated. It includes an accommodating part 212 and a power transmission part accommodating part 213 formed on the upper side of the output part accommodating part 212 and in which the power transmitting part 300 is rotatably accommodated.

The housing body 210 is formed so that the upper side of the power transmission unit accommodating part is open, and the output unit 400 and the power transmission unit 300 are installed in the housing main body 210 through the open side.

In addition, the housing body 210 is formed to be connected to the motor accommodating part 211, and a power terminal fastening part is provided so that a terminal that supplies power to the motor 110 disposed in the motor accommodating part 211 is inserted and fastened. (214) is provided.

Here, the power terminal fastening portion 214 is formed on the opposite side of the output portion accommodating portion 212 with the motor accommodating portion 211 as the center. Through this, the overall size of the housing 200 can be reduced.

The housing cover 220 is coupled to the open upper side of the housing body 210 and covers the power transmission unit 300 so that it is not exposed to the outside. In addition, the housing cover 220 can be fastened to the power transmission unit 300 so that it can rotate. That is, the rotation axis of the power transmission unit 300 can be supported to rotate by being fastened to at least one of the housing cover 220 and the housing main body 210.

The power transmission unit 300 receives the rotational power generated by the motor 110 and transmits it to the output unit 400. The power transmission unit 300 is composed of a plurality of gear combinations, and is configured to reduce the rotational speed of the motor 110 and amplify the torque to transmit greater power to the object.

More specifically, the power transmission unit 300 is coupled to the rotation shaft 111 of the motor 110 and rotates, and the drive gear 310 is meshed with the drive gear 310 and rotates in the housing 200. A transmission gear unit 320 provided with a transmission gear unit 320, a sun gear unit 330 engaged with the transmission gear unit 320 and provided to rotate in the housing 200, and externally engaged with the sun gear unit 330 and the A plurality of planetary gears 340 rotate around the planetary gear rotation shaft 420 provided in the output unit 400, and the planetary gears 340 are meshed so as to be inscribed and formed integrally inside the housing 200. It may include a ring gear 350.

That is, the power transmission unit 300 transmits the rotational power generated by the motor 110 to the transmission gear unit 320, the sun gear unit 330, and the planetary gear 340 through the driving gear 310. Through this, the torque can be amplified and transmitted to the output unit 400 while reducing the rotation speed.

Here, one end of the transmission gear unit 320 is fastened to the transmission gear rotation shaft fastening groove 215 formed in the housing main body 210, and the other end is fastened to the transmission gear rotation shaft fastening groove 221 formed in the housing cover 220. ) and a transmission gear rotation shaft 321 fastened to the transmission gear rotation shaft 321, which is rotatably inserted into the transmission gear rotation shaft 321 and has a diameter larger than the drive gear 310 and meshes with the drive gear 310 to transmit rotational power. A gear input unit 322, and a transmission gear output that protrudes in the axial direction from the transmission gear input part 322, is formed with a diameter smaller than the transmission gear input part 322, and meshes with the sun gear part 330 to transmit rotational power. It includes part 323.

In particular, the transmission gear rotation shaft 321 may be manufactured to be integrally fastened to either the housing body 210 or the housing cover 220 through insert injection. That is, when the transmission gear rotation shaft 321 is manufactured integrally with the housing body 210 through insert injection, the transmission gear rotation shaft 321 is fastened to the housing body 210 by fastening the housing cover 220 to the housing body 210. The other side end is inserted and fastened into the transmission gear rotation shaft fastening groove 221 formed on the housing cover 220.

With this configuration, the transmission gear input unit 322 is formed to have a larger diameter than the drive gear 310, so the rotational speed is reduced but the torque is increased compared to the drive gear 310.

In addition, the sun gear unit 330 is rotatably inserted into the sun gear rotation shaft 331, one end of which is fastened to the sun gear rotation shaft fastening groove 222 formed on the housing cover 220, and the sun gear rotation shaft 331, and the transmission A sun gear input unit 332 that is meshed with the gear unit 320 and receives rotational power, and which protrudes in the axial direction from the sun gear input unit 332 and is formed with a smaller diameter than the sun gear input unit 332, and the planetary gear 340 It may include a sun gear output unit 333 that is engaged and transmits rotational power.

In particular, the sun gear rotation shaft 331 may be manufactured to be integrally fastened to the housing cover 220 through insert injection molding. That is, when the sun gear rotation shaft 331 is manufactured integrally with the housing cover 220 through insert injection, the sun gear is connected to the sun gear rotation shaft 331 while fastening the housing cover 220 to the housing body 210. The input unit 332 and the sun gear output unit 333 are inserted.

Here, the sun gear input unit 332 is meshed with the transmission gear output unit 323 and is formed with a larger diameter than the transmission gear output unit 323, so the rotation speed is reduced compared to the transmission gear output unit 323. However, the torque increases.

In addition, the output unit 400 includes a base plate 410 rotatably mounted on the output unit receiving unit 212 formed in the housing body 210 so as to be concentric with the ring gear 350, and the base plate ( A planetary gear rotation shaft 420 that protrudes in the axial direction from one surface of the 410 and into which the plurality of planetary gears 340 are respectively inserted to rotate, and protrudes in the axial direction from one surface of the base plate 410 and the base plate ( It is formed with a diameter smaller than 410) and may include an output gear 430 that transmits rotational power to the outside.

Here, the planetary gear rotation shaft 420 is shown in FIG. 2 as having three planetary gears 340 engaged with the sun gear output unit 333. However, this is not limited to this, and two planetary gears 340 may be provided as needed. Or, it may be provided in four or more pieces.

With this configuration, when the sun gear output unit 333 rotates, the plurality of planet gears 340 rotate along the ring gear 350 to rotate the base plate 410, and finally, the output gear 430 ) rotates.

Among these power transmission units 300, the sun gear unit 330 may be manufactured integrally with the sun gear input unit 332 and the sun gear output unit 333 through insert injection.

To this end, the sun gear output portion 333 is formed with a sun gear fastening flange portion 334 that extends radially from one end and is located inside the sun gear input portion 332 and integrated therewith.

That is, after seating the sun gear fastening flange part 334 in a mold, the sun gear input part 332 can be injection molded so that the sun gear fastening flange part 334 is located inside the sun gear input part 332 and is manufactured as one piece. there is.

In addition, in a state where the sun gear fastening flange portion 334 is formed integrally with the sun gear input portion 332 through insert injection, the sun gear input portion 332 and the sun gear output portion 333 do not rotate and have no play due to rotational force. The plane is formed to form a polygon so that it can rotate together. That is, relative rotation is restricted by the corner portion of the sun gear fastening flange portion 334.

For example, as shown in FIG. 6, the sun gear fastening flange portion 334 may be formed in a hexagonal shape. Of course, it is not limited to this, and may be made of a polygon with edges such as a triangle or square.

If the sun gear fastening plan section is manufactured in a concavo-convex shape with protrusions and grooves, relative rotation can be restrained, but stress concentration occurs at the area where the protrusions and grooves meet, resulting in fatigue stress when used for a long period of time. This may cause the protrusions to be damaged, causing problems.

In comparison, the sun gear fastening flange portion 334 does not have protrusions or grooves, and receives and transmits the load in a plane, so there is no place where stress is concentrated, so there is no room for damage due to stress concentration.

This structure can also be applied to the output unit 400, as shown in FIG. 7. That is, the output gear 430 can be manufactured integrally with the base plate 410 through insert injection molding.

That is, the output gear fastening flange portion 440 may be formed on the output gear 430 to extend in the radial direction from one end and have a polygonal plane.

With this configuration, the output gear fastening flange portion 440 is formed integrally with the base plate 410 through insert injection, and relative rotation is restricted by the corner portion of the output gear fastening flange portion 440. You can.

Alternatively, although not shown in the drawings, the transmission gear unit 320 of the power transmission unit 300 may also be manufactured with this structure. That is, the transmission gear output portion 323 is manufactured integrally with the transmission gear input portion 322 through insert injection, and the transmission gear output portion 323 is inserted into the interior of the transmission gear input portion 322. The flange portion may have a polygonal shape.

Although the present invention has been described in detail through specific examples, this is for detailed explanation of the present invention, and the present invention is not limited thereto, and the present invention is intended to be understood by those skilled in the art within the technical spirit of the present invention. It is clear that modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

100: vehicle actuator 110: motor
200: Housing 210: Housing body
220: Housing cover 300: Power transmission unit
310: driving gear 320: transmission gear unit
321: Transmission gear rotation shaft 322: Transmission gear input unit
323: Transmission gear output unit 330: Sun gear unit
331: Sun gear rotation shaft 332: Sun gear input unit
333: Sun gear output unit 334: Sun gear fastening flange unit
340: planetary gear 350: ring gear
400: output unit 410: base plate
420: Planetary gear rotation shaft 430: Output gear
440: Output gear fastening flange part

Claims (7)

A housing equipped with a motor; and
It includes a power transmission unit provided in the housing and transmitting the rotational power of the motor to the output unit,
The power transmission unit,
A driving gear coupled to the rotating shaft of the motor and rotating;
a transmission gear unit engaged with the drive gear and provided to rotate in the housing;
a sun gear unit engaged with the transmission gear unit and provided to rotate in the housing;
a plurality of planetary gears externally engaged with the sun gear unit and rotating around a planetary gear rotation axis provided in the output unit; and
a ring gear meshed with the planetary gear to be in internal contact and integrally formed inside the housing;
A vehicle actuator including a.
According to paragraph 1,
The housing is,
a housing body in which the motor is accommodated, the output unit and the power transmission unit are rotatably coupled, and the ring gear is formed; and
A housing cover coupled to the housing body to cover the power transmission unit so that it is not exposed to the outside, and to which the power transmission unit is rotatably fastened;
A variable speed actuator comprising:
According to paragraph 2,
The transmission gear part,
A transmission gear rotation shaft having one end fastened to the housing main body and the other end fastened to the housing cover;
A transmission gear input unit that is rotatably inserted into the transmission gear rotation shaft and meshes with the drive gear to receive rotational power; and
a transmission gear output portion that protrudes in the axial direction from the transmission gear input portion, has a diameter smaller than that of the transmission gear input portion, and meshes with the sun gear portion to transmit rotational power;
An actuator for a vehicle comprising a.
According to paragraph 2,
The sun gear unit,
A sun gear rotation shaft whose one end is fastened to the housing cover;
a sun gear input unit that is rotatably inserted into the sun gear rotation shaft and meshes with the transmission gear unit to receive rotational power; and
a sun gear output unit that protrudes axially from the sun gear input unit, has a diameter smaller than that of the sun gear input unit, and transmits rotational power by engaging the planetary gear;
An actuator for a vehicle comprising a.
According to paragraph 4,
The sun gear output unit,
It further includes a sun gear fastening flange portion that extends in the radial direction from one end and is formed to have a polygonal plane,
An actuator for a vehicle, wherein the sun gear fastening flange portion is integrally formed with the sun gear input portion through insert injection, and relative rotation is restricted by a corner portion of the sun gear fastening flange portion.
According to paragraph 2,
The output unit,
a base plate rotatably mounted on the housing body so as to be concentric with the ring gear;
a planetary gear rotation shaft that protrudes in the axial direction from one surface of the base plate and into which the plurality of planetary gears are respectively inserted to rotate; and
an output gear that protrudes in the axial direction from one surface of the base plate, has a diameter smaller than that of the base plate, and transmits rotational power to the outside;
An actuator for a vehicle comprising a.
According to clause 6,
The output gear is,
It further includes an output gear fastening flange portion extending radially from one end and having a polygonal plane,
An actuator for a vehicle, wherein the output gear fastening flange portion is integrally formed with the base plate through insert injection, and relative rotation is restricted by a corner portion of the output gear fastening flange portion.