KR20150072582A - Power transmitting device for electric parking brake system - Google Patents

Power transmitting device for electric parking brake system Download PDF

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Publication number
KR20150072582A
KR20150072582A KR1020130159871A KR20130159871A KR20150072582A KR 20150072582 A KR20150072582 A KR 20150072582A KR 1020130159871 A KR1020130159871 A KR 1020130159871A KR 20130159871 A KR20130159871 A KR 20130159871A KR 20150072582 A KR20150072582 A KR 20150072582A
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KR
South Korea
Prior art keywords
gear
worm
parking brake
electric motor
power
Prior art date
Application number
KR1020130159871A
Other languages
Korean (ko)
Inventor
손종구
유성욱
Original Assignee
주식회사 만도
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020130159871A priority Critical patent/KR20150072582A/en
Publication of KR20150072582A publication Critical patent/KR20150072582A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
    • F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

Disclosed is a power transmission device for an electric parking brake system to provide a parking function with the operation of an electric motor. According to the present invention, the power transmission device for an electric parking brake system comprises: the electric motor; and a reduction gear part to amplify power generated by the electric motor. The reduction gear part comprises: a worm gear to receive the power of the electric motor to rotate; a worm wheel gear provided to be engaged with the worm gear; a first gear coaxially provided with the worm wheel gear; a belt engaged with the first gear; a second gear engaged with the belt; and an output shaft coaxially provided with the second gear.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric parking brake,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power transmitting device for an electronic parking brake, and more particularly, to a power transmitting device for an electronic parking brake capable of implementing a parking function by the operation of an electric motor.

Generally, a brake device is provided on a wheel of an automobile, so that the braking force is obtained by operation of the brake pedal while the vehicle is running. When the vehicle is parked, a braking force is generated by the lever operation of the parking brake.

A power transmission apparatus for an electric brake using electric power as a power source for generating a braking force of a vehicle, comprising: a drive force generating means for generating a drive force by using an electromechanical actuator or an electric motor (hereinafter collectively referred to as an electric motor) To a power transmission device of an electronic parking brake.

Hereinafter, the operation of the power transmission device of the electric brake will be described in detail with a conventional disk type parking brake (or a caliper type parking brake). However, the present invention is not limited to this, and a drum brake or a disk brake Or a caliper brake) or the like.

A general disc type electric parking brake apparatus is provided with a pair of pad plates having friction pads on both sides of the disc so that the piston driven by the electric motor brakes the vehicle by strongly pressing the friction pad against the disc.

A piston power transmission unit for pressing the pad plate against the disk, an electric motor, and a reduction gear assembly connected to the electric motor. The reduction gear assembly is provided with a worm deceleration structure and comprises an output shaft of the electric motor, a worm shaft having a first worm gear and a second worm gear, and a rotation transmission gear. The first worm gear of the worm shaft is engaged with the output shaft of the electric motor. The second worm gear of the worm shaft engages with the rotation transmission gear. When the electric motor operates, power is transmitted through the worm shaft to rotate the rotation transmission gear.

A nut is assembled to the inside of the piston, and the inside of the piston is formed in a non-circular shape to prevent rotation of the nut assembled in the inside. The nut is coupled to the spindle in a male and female thread structure, and the spindle is connected to the rotation transmission gear of the reduction gear assembly for receiving power from the power transmission unit. A sliding or rolling bearing is used between the spindle and the caliper housing to reduce friction and wear.

The power is transmitted to the rotation transmission gear through the output shaft and the warm shaft by the operation of the electric motor to rotate the rotation transmission gear and the spindle connected to the rotation transmission gear also has the rotational force. When the spindle rotates, the nut coupled with the screw structure is pushed, and the piston presses the pad plate to implement the parking function.

When the power transmission device of the electric brake is constituted by a worm reducer, it is advantageous in that it has a simple structure and a small-sized deceleration structure, and can achieve a high reduction ratio and a small operating noise at the gear portion.

However, the worm reducer has poor durability and wear resistance due to the friction of the tooth surface, and the efficiency is reduced due to the back lash due to the connection between the worm gears.

Korean Patent Publication No. 10-2010-0090274 (published on August 13, 2010)

An embodiment of the present invention is to provide a power transmission device of an electronic brake that generates power of a vehicle by transmitting power of an electric motor through a two-stage gear structure using a worm gear and a belt gear.

In addition, the embodiment of the present invention is intended to provide an electronic brake power transmission apparatus which adjusts the number of teeth of gears to realize various reduction ratios with respect to the same power.

According to an aspect of the present invention, there is provided an electric motor, comprising: an electric motor; and a reduction gear unit for amplifying power generated by the electric motor, wherein the reduction gear unit includes: a worm gear which is rotated by receiving power of the electric motor; A first gear which is provided coaxially with the worm wheel gear, a belt which is engaged with one side of the first gear, a second gear which meshes with the other side of the belt, and a second gear which is coaxial with the second gear A power transmission device of an electronic parking brake including an output shaft provided can be provided.

Further, the worm gear and the worm wheel gear may be provided with a power transmission device of an electronic parking brake provided so as to be normal to each other.

The first gear and the second gear may be helical gears, and a helical gear may be provided on the inner surface of the belt to engage the first and second gears.

Further, the worm gear and the worm wheel gear may be provided with a helical gear and a power transmission device of an electronic parking brake.

In the power transmission apparatus for an electronic parking brake according to the embodiment of the present invention, the reduction gear unit is constituted by a two-stage gear using a worm gear and a belt, so that noise and vibration can be reduced during operation of the parking brake.

In addition, the power transmission device of the electronic parking brake according to the embodiment of the present invention controls the number of teeth of the worm gear and the worm wheel gear or the first gear, the second gear and the belt of the reduction gear unit so that the power of the electric motor realizes various reduction ratios .

Further, in the power transmission device for an electronic parking brake according to the embodiment of the present invention, the axes of the worm gear and the worm wheel gear are in a normal direction to each other, so that the degree of freedom in designing the motor and the reduction gear unit can be increased when the electronic parking brake is installed in the vehicle .

1 is a side sectional view showing an electronic parking brake according to an embodiment of the present invention.
2 is a plan sectional view showing an electronic parking brake according to an embodiment of the present invention.
3 is a perspective view of a power transmission device of an electronic parking brake according to an embodiment of the present invention.

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

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Hereinafter, the operation procedure will be described in detail by connecting the power transmitting device of the electronic parking brake to the caliper type parking brake so as to make it easier to understand. However, the present invention is not limited to this and may be applied to a drum brake or a disc brake using electricity as a power source It should be understood that there is.

FIG. 1 is a side sectional view showing an electronic parking brake according to an embodiment of the present invention, and FIG. 2 is a plan sectional view showing an electronic parking brake according to an embodiment of the present invention.

1 and 2, the electronic parking brake includes a disk D rotating together with a wheel (not shown) of the vehicle, a pair of pads arranged to press both side surfaces of the disk D to perform braking A carrier 37 provided with a plate 39 and a caliper housing 36 in which a piston 33 installed so as to be able to move forward and backward so as to push the pair of pad plates 39 forward and backward, 10 and a reduction gear unit 20 connected to the electric motor 10 and a pressure device for converting the rotational force of the power transmission device into a linear reciprocating motion to press the piston 33. [

In the carrier 37, a pair of pad plates 39 and a friction pad P, which friction with a disk D rotating together with a wheel (not shown) of the vehicle, are provided so as to be movable forward and backward.

The inner friction pad P moves forward and backward on the side of the caliper housing 36 in accordance with the hydraulic pressure and advances the inner friction pad P out of the pair of friction pads P toward the disk D side, The piston 33 is provided inside the cylindrical cylinder 34. The piston 33 is provided in the inside of the cylindrical cylinder 34. The other side of the caliper housing 36 is formed with a fingering 38 for advancing the outer friction pad P toward the disk D side so that the outer friction pad P rubs against the disk D.

The piston 33 is advanced to the disk D side by the force transmitted during braking and presses the inner friction pad P against the disk D so as to move between the piston 33 and the outer friction pad P The finger 38 of the caliper housing 36 presses the outer friction pad P against the disk D by the reaction force causing the caliper housing 36 to move in the direction opposite to the direction of movement of the piston 33 Braking is performed by the frictional force acting between the friction pad P and the disk D. [

The piston (33) is inserted into the cylinder (34) so as to be slidable in a cylindrical shape having a cup shape inside. The inside of the piston 33 is formed in a non-circular shape to prevent rotation of the nut 32 assembled in the inside. The spindle 31 and the nut 32 are formed of a female screw and a male thread, respectively, and are screwed together, and the spindle 31 is connected to the power transmitting device.

Further, the electronic parking brake of the present invention includes a power transmission device for operating the piston 33. [ The power transmission apparatus includes an electric motor 10 and a reduction gear unit 20. The reduction gear unit 20 includes a worm gear 21 and a worm wheel 22, first and second gears 23 and 25, A belt 24, and an output shaft 26.

The power generated by the electric motor 10 is transmitted to the spindle 31 through the reduction gear unit 20. When the spindle 31 rotates, the nut 32 screwed with the piston 33 is pushed together with the piston 33, The braking force is applied to the vehicle.

The operation of the power transmission apparatus of the electronic parking brake according to the embodiment of the present invention will now be described.

FIG. 3 is a perspective view schematically showing a power transmission device for an electronic parking brake according to an embodiment of the present invention. FIG.

3, the worm gear 21 that is rotated by receiving the power to the electric motor 10 is engaged with the worm wheel 22, and the first gear 23, which is coaxial with the worm wheel 22, (24). The belt 24 transmits the power transmitted from the first gear 23 to the second gear 25 and the second gear 25 transmits power to the output shaft 26 coaxially disposed with the second gear 25 .

The worm gear 21 and the worm wheel gear 22 are configured to have a normal direction with respect to each other. The worm gear 21 and the worm wheel gear 22 are arranged in a normal direction with respect to each other so that the freedom of design of the motor and the reduction gear unit 20 can be increased when the electronic parking brake is installed in the vehicle.

The first gear 23 and the second gear 25 are provided as helical gears. Therefore, the inner teeth of the belt 24 engaged with the first and second gears 23 and 25 are also provided as helical gears. By applying the belt 24 and the gear having the helical gear, noise and vibration during power transmission can be reduced.

Further, the worm gear 21 and the worm wheel gear 22 may be provided as helical gears. Since the worm gear 21 and the worm wheel gear 22 are provided as helical gears, noise and vibration during power transmission can be reduced.

The worm gear 21 that has received the power of the electric motor 10 is operated so that the worm wheel gear 22 engaged with the worm gear 21 transmits the power to the first gear 23. The first gear 23 that receives the operation is connected to the belt 24 to transmit the power to the belt 24 and the second gear 25 engaged with the belt 24 is operated, . The second gear 25 transmits power to the output shaft 26 provided coaxially with the second gear 25 and the output shaft 26 generates rotation of the spindle 31 to rotate the nut 32 screwed with the spindle 31 The brake piston 32 is pushed and the brake piston 33 is translated.

The brake piston 33 moved to the disk D side is brought into close contact with the friction pad P toward the disk D, thereby braking the wheel.

2, the reduction gear unit 20 has a two-stage structure including a worm gear 21 and a gear 24, so that noise and vibration during operation of the parking brake can be reduced. Further, by adjusting the number of teeth of each gear, the power of the same electric motor 10 can be a power transmission device of an electronic parking brake in which various reduction ratios are realized.

The worm wheel gear 22 and the first gear 23 may have a long shape to increase the contact between the second gear 25 and the output shaft 26. The teeth may have a straight line or a curved shape and may have a rectangular or trapezoidal shape And can be made to conform to the teeth of the worm gear 21 and the belt 24 which are in contact with each other.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

10: electric motor 20: reducer fisher
21: Worm gear 22: Worm wheel gear
23: first gear 24: belt
25: second gear 26: output shaft
30: caliper brake 31: spindle
32: Nut 33: Piston
34: cylinder 35: sealing member
36: caliper housing 37: carrier
38: Finger Rejection 39: Pad Plate
39a: Inner pad plate 39b: Outer pad plate
P: friction pad D: disk

Claims (4)

An electric motor,
And a reduction gear unit for amplifying the power generated by the electric motor,
The reduction gear unit includes:
A worm gear which is rotated to receive power of the electric motor, a worm wheel gear which is provided so as to be engaged with the worm gear, a first gear which is coaxial with the worm wheel gear, a belt which is engaged with the first gear, A second gear engaged with the other side of the belt, and an output shaft provided coaxially with the second gear. The method according to claim 1,
Wherein the worm gear and the worm wheel gear mesh with each other so that an axis of the worm gear and an axis of the worm wheel gear are perpendicular to each other. The method according to claim 1,
Wherein the first gear and the second gear are provided as helical gears,
And a helical gear is provided on an inner surface of the belt to mesh with the first and second gears. The method according to claim 1,
Wherein the worm gear and the worm wheel gear are provided as helical gears.
KR1020130159871A 2013-12-20 2013-12-20 Power transmitting device for electric parking brake system KR20150072582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130159871A KR20150072582A (en) 2013-12-20 2013-12-20 Power transmitting device for electric parking brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130159871A KR20150072582A (en) 2013-12-20 2013-12-20 Power transmitting device for electric parking brake system

Publications (1)

Publication Number Publication Date
KR20150072582A true KR20150072582A (en) 2015-06-30

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KR1020130159871A KR20150072582A (en) 2013-12-20 2013-12-20 Power transmitting device for electric parking brake system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170064429A (en) * 2015-12-01 2017-06-09 엘지이노텍 주식회사 Parking brake actuator
US10794442B2 (en) 2018-02-06 2020-10-06 Mando Corporation Electromechanical actuator package with multi-stage belt drive mechanism
US20220024426A1 (en) * 2020-07-21 2022-01-27 Mando Corporation Parking actuator and electromechanical brake including the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170064429A (en) * 2015-12-01 2017-06-09 엘지이노텍 주식회사 Parking brake actuator
US10794442B2 (en) 2018-02-06 2020-10-06 Mando Corporation Electromechanical actuator package with multi-stage belt drive mechanism
US20220024426A1 (en) * 2020-07-21 2022-01-27 Mando Corporation Parking actuator and electromechanical brake including the same
US11932214B2 (en) * 2020-07-21 2024-03-19 Hl Mando Corporation Parking actuator and electromechanical brake including the same

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