Actuator assembly for electronic parking brake

Abstract

The present invention relates to an actuator assembly for an electronic parking brake having a multi-stage planetary gear mechanism. The present invention can provide an actuator assembly for an electronic parking brake. The multi-stage planetary gear mechanism comprises a center pin extending through through-holes of an entire planetary gear mechanism; a housing for supporting one end of the center pin; a plurality of a planetary gear carriers spaced apart from each other on the axial direction of the center pin and each including a through-hole; a plurality of planetary gears inserted into aplanetary gear shaft disposed radially around the through-hole on one side of the planetary gear carrier; and a sun gear of the planetary gear mechanism which is engaged with the planetary gear of the next stage on the opposite side of one surface of the planetary gear carrier on which the plurality of planetary gears are disposed so that the planetary gear carrier can rotate, wherein the diameter of the through-hole is larger than the diameter of the center pin.

Description

technical field [0001] The present disclosure relates to an actuator assembly for performing operation of an electric parking brake, and more particularly, to an actuator assembly for an electric parking brake, wherein the application for preventing loss of actuator output The planetary gear structure to achieve high-quality actuator components. [0002] More specifically, the present disclosure relates to an actuator assembly for an electric parking brake in which a king pin of a planetary gear mechanism is not integrally formed with a planet carrier to prevent an output of the planetary gear mechanism from being Deviate in the direction. Background technique [0003] The actuator of the electronic parking brake of a vehicle includes an electric motor and a power transmission device to operate a friction pad installed at a caliper of a disc brake when parking. [0004] For example, when the driver presses the parking brake switch, the rotational force of the motor of the ...

AI Technical Summary

Problems solved by technology

[0009] However, the first planetary gear unit 1002 has play in the circumferential direction, and when the center pin 1003 is fixed to the first planetary gear unit 1002 in a press-fit manner, the drive gear 1005 is in contact with the first planetary gear unit 1002 and the second planetary gear unit 1002. The overall alignment of the planetary gear unit 1012 in the circumferential direction of the first planetary gear unit 1002 is unstable, causing a deviation of the central axis of the first planetary gear unit 1002

[0010] In addition, since the sun gear of the drive gear 1005 for inputting power is engaged with the axis of the first planetary gear 1002, when the center axis of the first planetary gear unit 1002 deviates, the input power is not transmitted aligned with the center axis. , resulting in the loss of power finally transmitted to the output shaft of the second planetary gear unit 1012

[0011] Accordingly, conventional actuator structures have the risk of possible failure during operation due to deviation of the central axis, thus resulting in loss of overall power transmission and noise

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