KR101391103B1 - Motor axial connecting typed electrical parking brake in vehicle - Google Patents

Abstract

The EPB (Electronic Parking Brake), which is an electronic parking brake device of the present invention, is provided with a nut screw shaft 8 to which an axially moving bolt screw shaft 9 is coupled so as to pull the parking cable 18 through the speed reducer 4 The space occupied by the motor 3, the speed reducer 4, the screw shafts 8 and 9 and the sensors 12 is largely reduced so that the entire EPB The bolt screw shaft 9 which is moved in the axial direction by being engaged with the nut screw shaft 8 so as to operate the parking cable 18 is capable of reducing the size of the plastic resin So that the manufacturing cost can be reduced and the occurrence of operating noise can be reduced.

Motor, direct connection, parking brake

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic parking brake, and more particularly to a direct parking type electronic parking brake.

Generally, when the driver parks a vehicle, the parking brake is operated to restrain the movement of the vehicle.

Such a parking brake normally distributes the force applied to the parking cable pulled by the parking brake lever equally to the brake mechanism mounted on the wheel through the equalizer so that the brake mechanism restrains the wheel to move the vehicle .

In this manner, in the case of braking the wheels by operating the parking brake lever, the driver must operate the parking brake lever manually every time for parking braking, which is very inconvenient, .

Accordingly, an electronic parking brake (EPB) is used to reliably maintain the braking state while easily performing the parking operation at the time of parking by using the driving force of the motor so as to solve the inconvenience of the manual type. When the motor is driven by pressing the operation switch, the parking brake device normally generates equal braking force to each wheel through an equalizer according to the rotation of the motor by pulling the parking cable.

EPB, which is an electronic parking brake device, is typically used to measure the axial load acting on a portion of an equalizer that pulls a parking cable from a power generating site to control the motor power required to pull the parking cable during operation. And the tensile force of the cable is controlled by the ECU.

Since the axial load acts as data for correcting the deviation of the force that can be generated between the two cables pulling at the time of operation of the EPB, the mounting position of the sensor is important so that the axial load measurement is accurately performed. The mounting position of such a sensor acts as a factor for increasing the size in the axial direction of the EPB.

It is preferable that the EPB has a compact size for ease of mounting the vehicle. However, since the EPB has a structure in which the screw rods are arranged in multiple layers along with the gears for converting the rotational force of the motor into the axial movement force , And this structure also has a disadvantage that it functions as a factor for further increasing the size of the EPB.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an electronic parking brake device, And the size of the entire EPB can be reduced more compactly by applying a structure in which the gears are arranged along the circumference of the screw rod to greatly reduce the occupied space between the motor and the gear and the screw rod.

In addition, in the EPB of the present invention, the number of motor revolutions measured for the motor control is mounted on the screw rod portion and is measured through the magnetic force in a state where the motor, the gear and the screw rod as drive sources are arranged on the same shaft, The size of the EPB axis direction can be further reduced compared with the case where the tension of the cable shaft is directly measured.

In addition, since the EPB of the present invention uses an injection screw, which is linearly moved in the axial direction through a motor and a gear as a driving source, the manufacturing cost is greatly reduced compared to the case where screws are directly formed on the surface, And to reduce the incidence of such incidents.

According to an aspect of the present invention, there is provided an electronic parking brake apparatus including an ECU which receives a control signal of an operation button and various information related to a parking operation and generates a control signal,

A motor for generating a driving force for the parking brake release and the parking brake release force under the control of the ECU,

A speed reducer fixed to the motor shaft and coupled in series with the axial direction of the motor,

An axially moving member arranged in series in the axial direction of the motor while being rotated through the speed reducer to generate an axial movement force for pulling the parking cable,

A position sensor for transmitting a change due to the rotation of the axially moving member rotated through the speed reducer to the ECU so as to adjust the motor supply current of the ECU to adjust the pulling force of the parking cable,

A wheel cylinder for maintaining the braking state of the wheel through the parking cable operating force;

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The speed reducer includes a sun gear fixed to the motor shaft of the motor, a plurality of satellite gears arranged along the circumference of the sun gear and circumscribed by the sun gear, and a carrier .

The axially moving member may include a nut screw shaft rotated through a speed reducer and a bolt screw shaft axially moved so as to pull or loosen the parking cable in accordance with rotation of the nut screw shaft, And an inner shaft having a parking cable secured to an end thereof while being fixedly inserted into a hollow coupling hole to enhance the rigidity of the outer diameter shaft of the bolt screw and a bolt screw outer shaft connected to the nut screw shaft.

The position sensor is composed of a magnet embedded in the outer circumferential surface of the nut screw shaft and a hall element positioned in the housing to generate a magnetic force signal corresponding to the rotation of the magnet and to transmit the magnetic force signal to the ECU.

According to the present invention, an electronic parking brake (EPB) measures an electric parking brake (EPB) at a screw rod portion via a motor rotating power magnetic field while directly connecting a motor to a screw rod arranged along a circumference, The space occupied by the gears, the screw rods, and the measurement sensors can be greatly reduced, thereby reducing the size of the entire EPB to a more compact size and improving the vehicle mountability.

In addition, since the EPB of the present invention uses an injection screw, which is linearly moved in the axial direction through a motor and a gear as a drive source, the manufacturing cost is significantly reduced compared to the case where screws are directly formed on the surface, It is possible to reduce the weight and cost of the EPB as well as the occurrence reduction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 is a block diagram of a direct parking type electronic parking brake according to the present invention. The EPB (Electronic Parking Brake), which is an electronic parking brake according to the present invention, (2) for providing a parking brake release and a parking brake releasing force in accordance with the control of the ECU (1), an actuator actuator An axially moving member for operating the parking cable 18 and feeding back driving information (motor rotation) of the actuator assy 2 to the ECU 1, And a brake assy that maintains the braking state of the wheel in accordance with the operation of the brake pedal (2).

Here, the brake assy is a general device, that is, a parking cable 18 receiving an axial movement force generated from an axially moving member through an actuator assembly 2, A wheel cylinder 19 for holding the wheel disk mounted on the wheel to maintain the braking force, and the like, which is a typical configuration.

The actuator assy 2 includes a motor 3 for generating a forward or reverse rotational force in accordance with the control of the ECU 1 and a motor 3 coupled to the motor shaft 3a of the motor 3, An axially moving member for generating an axial movement force for operating the parking cable 18 through the speed reducer 4 in conformity with the axial direction of the motor 3; And a position sensor 12 provided as an axially moving member so as to control the tensile force of the parking cable 18 by feeding back the number of revolutions of the motor 3 to the ECU 1. [

Here, the speed reducer 4 includes a sun gear 5 fixed to the motor shaft 3a of the motor 3 and rotated, and a sun gear 5 disposed around the sun gear 5 and circumscribed to the sun gear 5 And a carrier 7 in which a plurality of satellite gears 6 and the satellite gear 6 are inscribed and rotated through the satellite gear 6. [

At this time, the satellite gear 6 is arranged along the circumference of the sun gear 5 at an angle of about 120 degrees.

2, the axially moving member is provided with a nut screw shaft 8 rotated through a speed reducer 4, and the parking cable 18 is rotated in accordance with the rotation of the nut screw shaft 8, And a bolt screw shaft 9 which is axially moved so as to pull or loosen the bolt screw shaft 9.

Here, the bolt screw shaft 9 has a bolt screw outer diameter shaft 10 formed with an outer circumferential surface and screwed to the nut screw shaft 8 and a hollow coupling hole 10 for reinforcing the rigidity of the bolt screw outer diameter shaft 10. And an inner shaft 11 to which the parking cable 18 is fixed at the end while being fitted and fixed to the inner shaft 10a.

At this time, the outer diameter shaft 10 of the bolt screw is injected with plastic resin, while the inner shaft 11 is made of steel to enhance the rigidity of the outer diameter shaft 10 of the bolt screw, The shaft 11 has a generally hexagonal cross-sectional shape.

That is, the inner shaft 11 is made of a hexagonal standard rod which does not require any machining, and the bolt screw outer diameter shaft 10 is taken out with a screw only injection mold. Then, the outer diameter shaft 10 and the inner shaft 11 of the bolt screw Bonding or press-fitting.

The nut screw shaft 8 is supported in the housing via the bearing 16 as it is rotated through the carrier 7 constituting the speed reducer 4 and the bolt screw shaft 9 is moved in the axial direction And is supported in the housing via the guide block 17.

The position sensor 12 measures the number of rotations of the nut screw shaft 8 that receives the rotational force of the motor 3 to the decelerator 4 so that the ECU 1 performs feedback control. Sensor.

That is, the position sensor 12 includes a magnet 13 fitted to the outer circumferential surface of the nut screw shaft 8 and a housing 15 for generating a magnetic force signal corresponding to the rotation of the magnet 13 to be transmitted to the ECU 1 And a Hall element 14 positioned at the magnetic portion 13 in the magnetic layer 13.

Here, the housing 15 refers to a part where the components of the EPB are mounted inside to form an appearance.

At this time, the position sensor 12 provides information for controlling how the ECU 1 controls the motor 3 and pulls and releases the parking cable 18 when the EPB is operated or released. When the Hall element 14 counts N / S poles of the magnet 13 zero times when the Hall element 14 is initially released, the displacement occurs at the bolt screw shaft 9 when 100 Kg is pulled, and the nut screw shaft 8 Is counted by the N / S pole of the magnet 13 by an amount that the motor 13 rotates in place, the ECU 1 controls the motor 3 using the count value.

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

The EPB (Electronic Parking Brake), which is an electronic parking brake device of the present invention, is provided with a nut screw shaft 8 to which an axially moving bolt screw shaft 9 is coupled so as to pull the parking cable 18 through the speed reducer 4 The space occupied by the motor 3, the speed reducer 4, the screw shafts 8 and 9 and the sensors 12 is largely reduced so that the entire EPB The bolt screw shaft 9 which is moved in the axial direction by being engaged with the nut screw shaft 8 so as to operate the parking cable 18 is capable of reducing the size of the plastic resin So that the manufacturing cost can be reduced and the occurrence of operating noise can be reduced.

This feature is due to the fact that the EPB of the present invention is located on the same axis as the parking cable 18 and the actuator assy 2 controlled by the ECU 1 as shown in Fig. The rotation of the nut screw shaft 8 that axially moves the bolt screw shaft 9 that pulls the parking cable 18 while the vehicle 2 is rotating is transmitted to the ECU 1 using the Hall IC type position sensor 12 The mounting position of the position sensor 12 for controlling the feedback of the actuator 2 by the ECU 1 does not increase the axial length of the actuator assy 2.

To this end, the actuator assy 2 is configured such that the speed reducer 4 receiving the rotational force of the motor 3 controlled by the ECU 1 is of a planetary gear type, that is, the speed reducer 4, And a carrier 7 which is inscribed again with a plurality of satellite gears 6 circumscribed to the sun gear 5 fixed to the motor shaft 3a and rotated.

In addition, an axial moving member for pulling the parking cable 18 to the planetary gear type speed reducer 4 coupled in series to the motor 3 is also connected in series, that is, the speed reducer 4 is provided with a nut screw shaft 8 is coupled to be rotated through the carrier 7 which is the final output end of the speed reducer 4 and the bolt screw shaft 9 pulling the parking cable 18 is screwed to the nut screw shaft 8 do.

The nut screw shaft 8 and the bolt screw shaft 9 which are axially moved so as to pull the parking cable 18 and the speed reducer 4 that decelerates the motor rotation force are connected in series with each other The rotation of the motor 3 causes the nut screw shaft 8 to rotate through the speed reducer 4 when the EPB is operated so that the bolt screw shaft 9 is rotated along the rotation of the nut screw shaft 8, The wheel cylinder 19 is operated so as to pull the parking cable 18 to generate the parking braking force.

When the EPB is operated, the ECU 1 performs feed back control so as to accurately control the pulling force of the parking cable 18. To this end, the ECU 1 controls the speed reducer 4, Type position sensor 12 that senses a nut screw shaft 8 that serves as a sensor.

That is, the magnet 13 having the N and S poles of the position sensor 12 is fitted on the outer peripheral surface of the nut screw shaft 8, and the magnetic pole 13 of the magnetic pole 13 The Hall element 14 for measuring the change is positioned at the magnetic portion 13 and is configured to transmit a magnetic force signal to the ECU 1. [

When the nut screw shaft 8 is rotated together with the speed reducer 4 driven through the motor 3 during operation of the EPB, the magnet 13 is rotated together with the nut screw shaft 8, The Hall element 14 counts the N / S pole change amount of the magnet 13 and transmits it to the ECU 1. The ECU 1 receives the N / The pulling force is calculated.

The measured value of the position sensor 12 is the same as the measured value of the position sensor 12 when the nut screw shaft 8 is not rotated, that is, in the initial state in which the parking cable 18 is not pulled, The amount of change in the number of N / S pole counting times of the magnet 13 due to the rotation of the nut screw shaft 8 is larger than the amount of change in the number of N / S pole counting times of the magnetic screw 13, (14) and input to the ECU (1).

That is, after calculating the axial pulling force of the parking cable 18 according to the current operation with the N / S pole change count value of the magnet 13 inputted to the ECU 1, the axial pulling force And controls the number of revolutions of the motor 3 when the adjustment is necessary.

1 is a block diagram of a direct parking type electronic parking brake according to the present invention;

Fig. 2 is a block diagram of each component according to the present invention. Fig.

    Description of the Related Art

1: ECU 2: Actuator Assy

3: motor 3a: motor shaft

4: Reduction gear 5:

6: Satellite gear 7: Carrier

8: nut screw shaft 9: bolt screw shaft

10: Bolt screw External diameter shaft

10a: Coupling hole 11: Inner shaft

12: Position sensor 13: Magnetic

14: Hall element 15: Housing

16: bearing 17: guide block

18: Parking cable 19: Wheel cylinder

Claims (8)

An ECU (1) for receiving a control signal of the operation button and various information related to the parking operation and generating a control signal, A motor 3 for generating a driving force for a parking brake release and a parking brake release force under the control of the ECU 1, A speed reducer 4 fixed to the motor shaft 3a and coupled in series with the axial direction of the motor 3, The nut screw shaft 8 coupled to the bolt screw shaft 9 for generating the axial movement force for pulling the parking cable 18 is rotated through the speed reducer 4 to rotate in the axial direction of the motor 3 An axially moving member arranged in series, The change in the rotation of the axially moving member rotated through the speed reducer 4 is controlled by the ECU 1 so as to adjust the supply current of the motor 3 of the ECU 1 to adjust the pulling force of the parking cable 18 The transmitting position sensor 12 and / And a wheel cylinder (19) for maintaining the braking state of the wheel through the operation force of the parking cable (18) The bolt screw shaft 9 has a bolt screw outer diameter shaft 10 formed on the outer circumferential surface thereof and coupled to the nut screw shaft 8 and a hollow coupling hole 10a , And an inner shaft (11) having a parking cable (18) fixed to an end thereof while being fixed by being fitted to the inner shaft (11). The speed reducer according to claim 1, wherein the speed reducer (4) comprises a sun gear (5) fixed and rotated on a motor shaft (3a) of a motor (3) And a carrier (7) in which a plurality of satellite gears (6) circumscribed to the sun gear (6) and the satellite gear (6) are inserted and rotated through a satellite gear (6). The direct parking type electronic parking brake according to claim 1, wherein the bolt screw shaft (9) pulls or loosens the parking cable (18) in accordance with rotation of the nut screw shaft (8). 4. The electromagnetic parking brake according to claim 3, wherein the nut screw shaft (8) is rotated through a carrier (7) as a final output end of the speed reducer (4). delete The electromagnetic parking brake according to claim 1, wherein the bolt screw outer diameter shaft (10) is injected with a plastic resin material, and the inner shaft (11) is made of a steel material. 7. The electromagnetic parking brake according to claim 6, wherein the coupling hole (10a) of the outer diameter shaft (10) of the bolt screw and the inner shaft (11) have a hexagonal sectional shape. The position sensor according to claim 1, wherein the position sensor (12) comprises: a magnet (13) fitted to the outer circumferential surface of the nut screw shaft (8); and a magnetic sensor And a Hall element (14) located in the housing (15) at a location of the magnet (13).

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