KR101655205B1 - Actuator of Electronic Parking Brake - Google Patents

Actuator of Electronic Parking Brake Download PDF

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Publication number
KR101655205B1
KR101655205B1 KR1020150093511A KR20150093511A KR101655205B1 KR 101655205 B1 KR101655205 B1 KR 101655205B1 KR 1020150093511 A KR1020150093511 A KR 1020150093511A KR 20150093511 A KR20150093511 A KR 20150093511A KR 101655205 B1 KR101655205 B1 KR 101655205B1
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KR
South Korea
Prior art keywords
motor
housing
screw
nut screw
elastic body
Prior art date
Application number
KR1020150093511A
Other languages
Korean (ko)
Inventor
백상석
공정현
Original Assignee
주식회사 인팩
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Publication date
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Priority to KR1020150093511A priority Critical patent/KR101655205B1/en
Application granted granted Critical
Publication of KR101655205B1 publication Critical patent/KR101655205B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms

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

Abstract

The present invention relates to an electronic parking brake actuator which comprises: a nut screw rotationally driven by a worm wheel, and freely moved in a transverse direction; a bolt screw screwed to the nut screw; an elastic body capable of elastically supporting the nut screw and the bolt screw on a wall surface of an applying direction side of a housing. With one elastic body, in all applying and releasing operation, a housing can be protected, and further, time to stop a motor can be determined.

Description

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

The present invention relates to an electronic parking brake actuator, and more particularly, to an electronic parking brake actuator operated by an electronically controlled motor.

The parking brake is a device for stably maintaining the stopping state of the vehicle at the time of parking, and it is also used as an auxiliary brake in emergency in case of the main brake which is decelerating while driving.

The conventional parking brake is operated by pulling a wire connected to the parking brake mechanism of the rear wheel by operating a lever or a pedal provided near the driver's seat.

In recent years, EPB (Electronic Parking Brake), that is, electronic parking brake, in which an electronic control unit recognizing a switch operation of a driver operates a parking brake by operating an actuator driven by a motor and pulling a wire is widely used.

In electronic parking brakes, the actuators are mounted together on a back plate equipped with brake mechanisms. This type of actuator is referred to as a DIH (Drum in Hat) integrated actuator, and the present invention relates to such DIH integral actuator.

In general, as disclosed in Korean Patent Laid-Open Publication No. 10-2012-0088995, a DIH integral type actuator includes a gear (worm, worm wheel) driven by a motor and a bolt screw And a wire for operating a parking brake mechanism is connected to an end of the bolt screw.

Therefore, the bolt screw is moved forward / backward according to the operating direction of the motor, so that the wire is pulled (Apply operation) or restored to the original state (Release operation), so that the parking brake is released or the parking brake is released.

FIG. 1 is a partial schematic view of a conventional electronic parking brake actuator including a motor, a worm and a worm wheel, and FIG. 2 is a schematic view showing an opposite end portion of the conventional electronic parking brake actuator.

The conventional actuator shown in the figure has a structure in which a worm wheel 20 is rotatably installed inside a housing 10 and a bolt screw 40 is screwed to a tapped hole (= female screw hole) formed through the center of the worm wheel 20 . The worm wheel 20 is engaged with a worm (not shown), and the rotation shaft of the motor is connected to one end of the worm. The axial movement of the worm wheel 20 is suppressed by the guide plate 30 fixed to the housing 10 so that the worm wheel 20 can rotate but not move in the axial direction.

The rotation direction of the worm wheel 20 is changed according to the rotation direction of the motor and the bolt screw 40 is moved in the application direction ) Or a release direction (release; rightward direction in the drawing as the operation direction in which the parking brake is released).

Therefore, during the application operation, the wire connected to the parking brake mechanism is pulled to perform the parking braking operation, and at the time of release operation, the wire is returned to the home position and the parking brake is released.

2, a release spring 41 is provided between the bolt screw 40 and the wall surface 12 of the housing 10 in the release direction side portion.

Therefore, the release spring 41 is compressed at the end of the release operation. When the release spring 41 is compressed, the amount of current used by the motor rapidly increases. Therefore, the electronic control unit It senses this and decides the release point (the point at which the release operation is stopped) and stops the motor operation.

Such conventional actuators have the following problems.

If the actuator is operated in an unloaded state, which is not installed in the vehicle (mainly occurring during the operation test procedure), there is no configuration to hold the bolt screw 40 in the application direction, So that one end of the bolt screw (40) collides against the wall surface (11) of the housing (10). Therefore, there is a problem that the wall surface 11 of the housing 10 is damaged by the impact force generated at that time. Further, even if the wall surface 11 of the housing 10 is not broken, the screw between the bolt screw 40 and the tapped hole of the worm wheel 20 is locked, which further disables the operation.

Therefore, the application side wall surface 11 of the housing 10 is also provided with an elastic body corresponding to the release spring 41 so as to relieve the contact shock as in the release side wall surface 12 and allow the electronic control unit to determine the attachment point Was required to be installed.

However, when a separate elastic body is provided on the application side wall surface 11 of the housing 10, since the elastic body is provided on both sides of the housing 10, the number of parts is increased, The efficiency of the design is deteriorated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an airbag device capable of preventing damage to a housing and actuator locking due to excessive application operation in a state before an actuator is installed in a vehicle, It is an object of the present invention to provide an electronic parking brake actuator configured to be able to determine a stoppage time during fly and release operations.

According to another aspect of the present invention, there is provided a worm wheel including: a housing; a worm wheel rotatably installed in the housing; a worm wheel rotatably installed in the worm wheel, A bolt screw which is screwed with the nut screw and is connected to a wire for operating a parking brake mechanism at one end thereof and an elastic body which is installed on a sidewall of the housing in the operating direction of the housing and elastically supports a bolt screw and a nut screw, .

Wherein a guide member surrounding the elastic body is provided on a sidewall of the housing in an operation direction of the housing, and one end of the guide member is inserted into the guide member so that the support plate is movable in the lateral direction, .

The support plate includes a plate-shaped body and an insertion end protruding from one side of the body and inserted into the guide member.

At one side surface of the body of the support plate, a seating groove for receiving the end of the nut screw is formed when the nut screw is contacted.

The worm is connected to a motor, and the motor is operated and controlled by an electronic control unit. The electronic control unit always checks the power used by the motor, and the electronic control unit When the motor is applied, the bolt screw compresses the elastic body through the support plate, and stops the motor operation when the power consumption increases rapidly above the set value.

In addition, the electronic control unit compresses the elastic body through the support plate during the release operation of the motor, and stops the operation of the motor when the power consumption rapidly increases to a predetermined value or more.

According to the present invention as described above, the elastic body is provided on the side wall of the housing of the housing.

Therefore, when the actuator is operated in the state before the actuator is installed in the vehicle, the elastic body can support the bolt screw, thereby preventing the housing from being damaged by the bolt screw.

In addition, since the bolt screw is supported by the elastic body and the operation of the motor is not continued in the state where the bolt screw is completely stopped, it is possible to prevent the screwed portion of the bolt screw from being locked.

The breakage and the locking as described above do not occur, so that the failure of the actuator is prevented.

In addition, since the nut screw and the bolt screw are axially movable relative to each other, the elastic body is provided on one side of the housing as described above, and the nut screw is screwed to the bolt screw. In all cases of release operation, it can be used as a part to determine the point of time of shutdown.

Therefore, there is an advantage in that the number of components is reduced by eliminating the need to provide two elastic bodies for judging suspension of the operation of the actuator.

1 is a partial schematic view of a conventional electronic parking brake actuator;
Fig. 2 is a partial schematic view of the opposite end of Fig. 1; Fig.
FIG. 3 and FIG. 4 are partial schematic views of an electronic parking brake actuator according to the present invention corresponding to FIG. 1, and FIG. 3 is an operational state diagram of an application. Fig. 4 is an operational state diagram at the time of release; Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

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

3 and 4, the electronic parking brake actuator according to the present invention includes a housing 10, a worm wheel 20 rotatably installed in the housing 10, A nut screw 50 which is fixed to the worm wheel 20 in a rotating direction and is slidable in the axial direction (= transverse direction), a nut screw 50 is screwed to the worm wheel 20 and a parking brake mechanism A bolt screw 40 connected to a wire for operating the bolt screw 40 and an elastic body 70 installed on the side wall 11 of the housing 10 in the operating direction of the housing 10 to elastically support the bolt screw 40 and the nut screw 50 do.

The housing 10 provides a mounting location for the components and protects them by isolating the components from the external space.

A worm (not shown) is installed in the housing 10 in an upright state, and the worm wheel 20 is engaged with the worm. The rotation of the worm wheel 20 can be controlled by controlling the rotation direction of the worm wheel 20 in accordance with the rotation direction of the motor. It is possible to move the bolt screw 40 in the application direction (the direction in which the wire is pulled in the left direction in the figure) or the release direction (in the direction in which the wire is returned in the right direction in the drawing) by controlling the rotation direction.

The motor is operatively controlled by an electronic control unit which is a component of the parking brake system. In addition, the electronic control unit has motor control logic that always checks the power consumption of the motor and stops the motor operation when the power consumption suddenly increases above the set value during the application and release operations.

The worm wheel 20 is formed with a helical gear on the outer circumference thereof and meshing with the worm, and a hexagonal through hole is formed therein. The through holes formed in the worm wheel 20 have the same outer shape, shape and dimensions as those of the nut screws 50. The nut screw 50 is inserted into the through hole as a hexagonal columnar shape. Therefore, when the worm wheel 20 is rotated, the nut screw 50 can be rotated integrally with the worm wheel 20 and moved in the axial direction left and right.

The nut screw (50) is formed with a tapped hole having an internal thread on the inner peripheral surface and passing through the center in the axial direction.

The bolt screw 40 has a male screw corresponding to the female screw formed on the outer circumferential surface thereof and a bolt screw 40 is inserted into the screw hole of the nut screw 50 so that the female screw and the male screw are mutually engaged. A wire (not shown) for operating the parking brake mechanism is connected to one end of the bolt screw 40 (the release direction side end portion in the right direction in the drawing).

On the other hand, the elastic body 70 is mounted on the sidewall 11 of the housing 10 in the operation direction. A disk spring, a coil spring, or the like can be used as the elastic body 70, and one end portion is fixed to the wall surface 11. The elastic body 70 is installed at positions facing each other with the bolt screw 40 and the nut screw 50.

A cylindrical guide member 13 surrounding the elastic body 70 is provided around the elastic body 70 at a predetermined distance from the elastic body 70. The guide member 13 is preferably integrally formed on the wall surface 11 of the housing 10.

The guide member 13 is provided with a support plate 60 which is inserted into the guide member 13 at one end thereof and can move laterally along the inner surface of the guide member 13.

The support plate 60 includes a disc 61 having a larger diameter than the guide member 13 and an insertion end 62 projecting from one side of the body 61 and inserted into the inner diameter portion of the guide member 13 ). The insertion end 62 is inserted into the inner diameter portion of the guide member 13 to guide the left and right movement of the support plate 60 and the end of the insertion end 62 is brought into contact with the elastic body 70 as described above.

On the side surface of the body 61 of the support plate 60 is formed a seating groove 61a through which the end of the nut screw 50 can be inserted. The end portion of the nut screw 50 can be freely inserted and removed into the seating groove 61a and is not press-fitted into the seating groove 61a with a binding force.

The present invention now explains the operation and effects.

The rotation force of the motor rotates the worm wheel through the worm. The nut screw (50) is restrained in the rotation direction with respect to the worm wheel (20) and is integrally rotated, and is freely movable in the axial direction. Therefore, the electronic control unit can control the direction of rotation of the nut screw 50 by controlling the operating direction of the motor.

The bolt screw 40 is moved in a direction to be inserted into the nut screw 50 in accordance with the rotation direction of the nut screw 50 so that the operation of the actuator is performed by pulling the wire, So that the release operation of the actuator is performed by moving the wire in the direction protruding outward.

On the other hand, when the actuator is operated in an unloaded state in which the actuator is not installed in the vehicle, the bolt screw 40 is moved in the application direction (left side of the figure) by the screw action with the nut screw 50, 40 are not connected to the wire, so there is no part to hold it, so that it protrudes to the opposite side of the nut screw 50.

The end of the bolt screw 40 protruded toward the opposite side of the nut screw 50 pushes the support plate 60 and the insertion end 62 of the support plate 60 presses the elastic body 70.

The elastic body 70 absorbs the shock caused by the bolt screw 40 so that the wall surface 11 of the housing 10 can be prevented from being damaged by the direct impact of the bolt screw 40. [

The bolt screw 40 rotates at a high speed and then abruptly stops while colliding against the wall surface 11 of the housing 10 so that the bolt screw 40 is slowly decelerated while being buffered by the elastic body 70, So that locking does not occur between the screws 50.

Therefore, it is possible to prevent breakdown and locking failure of the actuator.

Now, the operation of the apply and release in the state that the actuator is mounted on the vehicle is explained.

The same operation as that of the above-described no-load application operation occurs even when the vehicle is in the mounted state. Therefore, damage to the wall surface 11 of the housing 10 of the bolt screw 40 and locking of the bolt screw 40 and the nut screw 50 are prevented.

Since the resilient body 70 is compressed by the bolt screw 40 and a repulsive force that pushes the bolt screw 40 in the opposite direction is generated, the repulsive force acts as a resistance to the motor that operates the bolt screw 40 in the application direction The power consumption of the motor is rapidly increased.

At this time, the electronic control unit senses the sudden increase of the power consumption of the motor and judges the application point as the application point (the point at which the application operation should be stopped) and stops the operation of the motor. Therefore, the excessive application operation is not performed, thereby more reliably preventing the housing wall surface 11 from being damaged by the bolt screw 40 and locking with the nut screw 50.

The nut screw 50 is also rotated in the opposite direction during the release operation in which the motor is operated in the reverse direction so that the bolt screw 40 protrudes from the nut screw 50 and moves in the release direction and the wire is loosened to release the runner braking state .

As shown in FIG. 4, the nut screw 50 moves in the opposite direction, that is, in the opposite direction, by the reaction force against the movement of the bolt screw 40 in the release direction.

Therefore, when the release operation continues, the nut screw 50 contacts the support plate 60 and presses the elastic body 70 through the support plate 60. [ At this time, the end of the nut screw (50) can push the support plate (60) more stably while being inserted into the seating groove (61a) of the support plate (60).

As described above, since the elastic body 70 is compressed, the repulsive force of the elastic body 70 acts on the nut screw 50, which acts as a resistance for suppressing the release operation of the motor.

As a result, the current of the motor is rapidly increased, and the electronic control unit senses it and determines that the release point (the point at which the release operation should be stopped) and stops the operation of the motor. Accordingly, it is possible to prevent the bolt screw (40) and the nut screw (50) from being excessively moved in mutually opposite directions and being separated from each other by an excessive release operation.

As described above, according to the present invention, one elastic body 70 can be used to determine an appropriate motor operation stopping point in both the application operation and the release operation.

Therefore, the number of the elastic bodies to be used is reduced, so that a more efficient actuator can be designed, the number of parts is reduced, and the structure of the actuator is simplified.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: housing 11, 12:
13: guide member 20: worm wheel
30: guide plate 40: bolt screw
50: nut screw 60: support plate
61: body 62: insertion end
61a: seating groove 70: elastic body

Claims (6)

A housing;
A worm wheel rotatably installed in the housing;
A nut screw installed to penetrate the center of the worm wheel and restrained in a rotating direction of the worm wheel and slidable in the axial direction;
A bolt screw threaded with the nut screw and connected to a wire for operating a parking brake mechanism at one end thereof,
And an elastic body provided on a sidewall of the housing in an operation direction of the housing and elastically supporting the bolt screw and the nut screw,
A guide member surrounding the elastic body is provided on a sidewall of the housing in the operation direction of the housing, and a support plate is installed so that one end of the guide member is inserted into the guide member to be laterally movable, Wherein the first and second parking brake actuators are in contact with each other. delete The method according to claim 1,
Wherein the support plate includes a plate-like body and an insertion end protruding from one side of the body and inserted into the guide member. The method of claim 3,
Wherein a seating groove for receiving an end portion of a nut screw is formed on one side surface of the body of the support plate when the nut screw is contacted. The method according to claim 1,
The worm is connected to a motor, and the motor is operated and controlled by an electronic control unit. The electronic control unit constantly checks the power used by the motor, and the electronic control unit Wherein when the motor is applied, the bolt screw compresses the elastic body via the support plate to stop the operation of the motor when the power consumption is rapidly increased to a predetermined value or more. The method according to claim 1,
The worm is connected to a motor, and the motor is operated and controlled by an electronic control unit. The electronic control unit constantly checks the power used by the motor, and the electronic control unit Wherein when the nut screw compresses the elastic body through the support plate during the release operation of the motor, the motor operation is stopped when the power consumption is rapidly increased to the set value or more.
KR1020150093511A 2015-06-30 2015-06-30 Actuator of Electronic Parking Brake KR101655205B1 (en)

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KR1020150093511A KR101655205B1 (en) 2015-06-30 2015-06-30 Actuator of Electronic Parking Brake

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020101445A1 (en) * 2018-11-15 2020-05-22 Mando Corporation Brake system having spindle/nut assembly providing soft stop
KR20220062706A (en) * 2020-11-09 2022-05-17 주식회사 인팩 Electronic parking brake actuator and electronic parking brake system using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130057881A (en) * 2011-11-24 2013-06-03 현대모비스 주식회사 Electrical parking brake device
KR20130123788A (en) * 2012-05-03 2013-11-13 현대모비스 주식회사 Electronic parking brake apparatus
KR20150046868A (en) * 2013-10-23 2015-05-04 현대모비스 주식회사 Electronic-parking-brake absorbing-impact from immoderate-operation of screw and manufacturing-method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130057881A (en) * 2011-11-24 2013-06-03 현대모비스 주식회사 Electrical parking brake device
KR20130123788A (en) * 2012-05-03 2013-11-13 현대모비스 주식회사 Electronic parking brake apparatus
KR20150046868A (en) * 2013-10-23 2015-05-04 현대모비스 주식회사 Electronic-parking-brake absorbing-impact from immoderate-operation of screw and manufacturing-method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020101445A1 (en) * 2018-11-15 2020-05-22 Mando Corporation Brake system having spindle/nut assembly providing soft stop
KR20220062706A (en) * 2020-11-09 2022-05-17 주식회사 인팩 Electronic parking brake actuator and electronic parking brake system using the same
KR102470762B1 (en) * 2020-11-09 2022-11-28 주식회사 인팩 Electronic parking brake actuator and electronic parking brake system using the same

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