KR20120060069A - Electronic parking brake system for vehicle - Google Patents

Electronic parking brake system for vehicle Download PDF

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Publication number
KR20120060069A
KR20120060069A KR1020100121634A KR20100121634A KR20120060069A KR 20120060069 A KR20120060069 A KR 20120060069A KR 1020100121634 A KR1020100121634 A KR 1020100121634A KR 20100121634 A KR20100121634 A KR 20100121634A KR 20120060069 A KR20120060069 A KR 20120060069A
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KR
South Korea
Prior art keywords
piston
parking brake
caliper housing
vehicle
spindle shaft
Prior art date
Application number
KR1020100121634A
Other languages
Korean (ko)
Inventor
유병수
Original Assignee
현대자동차주식회사
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 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020100121634A priority Critical patent/KR20120060069A/en
Publication of KR20120060069A publication Critical patent/KR20120060069A/en

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Classifications

    • 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
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper 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
    • 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
    • F16D65/183—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 with force-transmitting members arranged side by side acting on a spot type force-applying member
    • 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
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/20—Electric or magnetic using electromagnets
    • 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
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/06—Pistons

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

Abstract

An electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention includes a carrier fixed to a vehicle body, a caliper housing installed on the carrier so as to move forward and backward, and a disc that rotates together with a wheel of the vehicle. A pair of friction pads installed in the caliper housing, a piston mounted to the cylinder portion provided in the caliper housing, a piston for pressing one of the pair of friction pads with the disk, and rotatable in the cylinder portion. And a spindle screwed to the spindle shaft, the sleeve being pushed back and forth according to the rotation of the spindle shaft, and pressing and releasing the piston, and an actuator configured to rotate the spindle shaft. The caliper housing and the piston are mutually coupled as protrusions and grooves Characterized in that.

Description

Electric Parking Brake System for Vehicles {ELECTRONIC PARKING BRAKE SYSTEM FOR VEHICLE}

An exemplary embodiment of the present invention relates to an electric parking brake apparatus for a vehicle, and more particularly, to an electric parking brake apparatus for a vehicle that electronically controls the driving of the parking brake.

In general, a brake device includes a parking brake, usually referred to as a hand brake or a side brake, which keeps a vehicle stationary.

The parking brake is operated as the driver manipulates the parking lever provided at one side of the driver's seat inside the vehicle. Specifically, when the driver pulls the parking lever and pulls the cable connected thereto, the rear wheel brake assembly connected to the cable is operated to secure the braking force. On the contrary, the driver releases the parking lever to release the braking force when the cable is released.

However, since the operation of the parking brake according to the operation of the parking lever is operated only by the driver's will, if the vehicle is parked on a slope without the driver's carelessly pulling the parking lever, the vehicle will roll down causing an unexpected accident. You can. In addition, since the driver should operate the parking lever at the time of parking or when the vehicle is started, the use thereof is very troublesome, especially for women or the elderly who are weak in their use, which is more troublesome.

Therefore, recently, an electronic parking brake (EPB) system for electronically controlling the driving of the parking brake is used, which is mounted on a conventional disc brake to perform the function of the parking brake.

The electric parking brake system operates automatically to maintain the parking or stopping state of the car when the driver stops or the vehicle is pushed back when the hill leaves, even if the driver does not operate the parking brake manually. will be.

Here, the electronic parking brake system includes a cable puller type, a motor-on-caliper type (commonly referred to as "caliper integrated type" in the art), a hydraulic parking brake type, and the like. There is this.

3 is a diagram illustrating a motor on caliper type as an example of an electric parking brake system of a vehicle according to the prior art.

Referring to the drawings, the electric parking brake system of the vehicle according to the prior art is coupled to the vehicle body and a pair of friction pads 111 installed therein and spaced apart from each other at regular intervals, and moving forward and backward on the carrier 110 A caliper housing having a cylinder portion 120a in which the piston 121 is installed to be moved forward and backward so that the two friction pads 111 can be pressed by the disk D, and the finger portion 120b is provided on the other side. 120.

In addition, in the related art, the piston 121 is moved forward and backward by the rotation of the spindle shaft 131 and the spindle shaft 131 rotatably installed in the cylinder portion 120a of the caliper housing so as to perform the function of the parking brake. A sleeve 132 is provided inside the piston 121 to pressurize or depressurize, and an actuator 141 for rotating the spindle shaft 131.

Therefore, when the driver operates the operation switch (not shown) for parking, the spindle shaft 131 rotates and the axial movement of the sleeve 132 is performed, and the sleeve 132 moves forward and the piston 121 is moved. Braking is achieved by pressurizing.

However, in the related art, while the rotational force of the spindle shaft 131 acts on the piston 121, the piston 121 rotates on the contact surface of the base plate 115 of the friction pad 111, thereby preventing wear of the base plate 115. One-sided contact, uneven wear and abnormal noise of the friction pad 111 are generated, and the rubber boot 116 and the caliper housing 120 and the piston 121 connecting the caliper housing 120 and the piston 121 are sealed. There is a problem that leakage may occur due to distortion of the oil seal 117.

Exemplary embodiments of the present invention have been created to improve the above problems, and provide an electric parking brake apparatus for a vehicle which can prevent the piston from rotating by a rotational force of the spindle shaft as a simple structure.

To this end, an electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention includes a carrier fixed to a vehicle body, a caliper housing installed on the carrier so as to move forward and backward, and a disc that rotates together with a wheel of the vehicle. A pair of friction pads installed in the carrier so as to move forward and backward, a piston mounted to the cylinder portion provided in the caliper housing so as to move forward and backward, and pressurizing any one of the pair of friction pads with a disk; A spindle shaft rotatably installed, a sleeve screwed to the spindle shaft and moving back and forth according to the rotation of the spindle shaft, and for pressing and releasing the piston, and an actuator configured in the caliper housing and rotating the spindle shaft. The caliper housing and the piston are No. characterized in that the coupling.

In the vehicle electric parking brake apparatus, the protrusion and the groove may prevent the rotation of the piston and guide the linear movement of the piston.

In the vehicle electric parking brake apparatus, at least one coupling protrusion may be formed on an inner circumferential surface of the cylinder portion of the caliper housing.

In the vehicle electric parking brake apparatus, a defect groove to which the engaging projection may be coupled may be formed on the outer circumferential surface of the piston.

In the vehicle electric parking brake device, the engaging projection may be formed long in the longitudinal direction of the piston on the inner peripheral surface of the cylinder portion.

In the vehicle electric parking brake device, the coupling groove may be formed long in the longitudinal direction on the outer peripheral surface of the piston.

According to the electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention as described above, a plurality of engaging projections are formed on the inner peripheral surface of the cylinder portion of the caliper housing, the defect that can be coupled to the engaging projection of the cylinder portion on the outer peripheral surface of the piston Since the groove is formed, it is possible to prevent the piston from rotating and convert the rotary motion acting on the piston into linear motion with respect to the cylinder portion of the caliper housing.

Therefore, in this embodiment, the rotational motion acting on the piston can be converted into linear motion with respect to the cylinder portion of the caliper housing while preventing the rotation of the piston, thereby converting the rotational force acting on the piston into the braking torque for the friction pad. Can be.

As a result, in this embodiment, the braking torque (capacity) of the disk can be increased, and the rotation of the piston can be prevented, thereby preventing occurrence of one-sided contact of the friction pad, uneven wear, and abnormal noise due to wear of the base plate. It is possible to prevent the leakage of oil due to the twisting of the rubber boot and the oil seal.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a cross-sectional view showing an electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention.
2 is a cross-sectional view taken along line AA of FIG. 1 illustrating a coupling structure of a caliper housing and a piston applied to an electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention.
3 is a cross-sectional view showing an example of an electric parking brake system for a vehicle according to the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings, and is shown by enlarging the thickness in order to clearly express various parts and regions. It was.

1 is a cross-sectional view showing an electric parking brake apparatus for a vehicle according to an exemplary embodiment of the present invention.

Referring to the drawings, the vehicle electric parking brake apparatus 100 according to an exemplary embodiment of the present invention is also referred to as EPB (Electronic Parking Brake), for electronically controlling the driving of the parking brake.

Here, the electric parking brake device 100 is mounted to the disk brake and performs the function of the parking brake, in this embodiment may be configured as a motor-on-caliper (caliper integrated).

The vehicle electric parking brake apparatus 100 according to the present embodiment as described above basically includes a carrier 10 fixed to the vehicle body and a caliper housing 20 movably coupled to the carrier 10. .

In the carrier 10, a pair of friction pads 11 which friction with the disk D rotating together with the wheel of the vehicle is installed to move forward and backward, and the pair of friction pads 11 are spaced apart from each other. The disk D is arranged between them. Therefore, the friction pad 11 moves forward and backward toward the disk D and braking is performed.

One side of the caliper housing 20 moves forward and backward according to the transmitted hydraulic pressure and advances one friction pad 11 of the pair of friction pads 11 to the disk D side so that the friction pad 11 has a disk ( The piston 21 which makes friction with D) is provided.

On the other side of the caliper housing 20, a finger portion 20b for advancing the other friction pad 11 toward the disk D and causing the friction pad 11 to rub against the disk D is formed. .

Therefore, the piston 21 advances toward the disc D by the hydraulic pressure transmitted during braking and presses one side friction pad 11 to the disc D, and acts between the piston 21 and one side friction pad 11. Due to the reaction force, the caliper housing 20 moves in the direction opposite to the movement direction of the piston 21. Accordingly, the finger portion 20b provided on the other side of the caliper housing 20 causes the other friction pad 11 to be moved to the disk. Braking is achieved by the frictional force acting between the two friction pads 11 and the disk D by applying pressure to (D).

In the drawings, reference numeral 15, which is not described, denotes a base plate that supports the friction pad 11 and contacts the piston 21, and reference numeral 16 denotes a rubber boot connecting the caliper housing 20 and the piston 21. boot, and reference numeral 17 denotes an oil seal for sealing the caliper housing 20 and the piston 21.

Meanwhile, in the exemplary embodiment of the present invention, the spindle shaft 31 and the spindle shaft 31 rotatably installed in the cylinder portion 20a of the caliper housing 20 to perform the electric parking brake function. An actuator for rotating the spindle shaft 31 and a sleeve 32 installed inside the piston 21 to pressurize or depressurize the piston 21 and move in the direction, and to rotate the spindle shaft 31. It includes (41).

Here, the spindle shaft 31 has a thread is formed on the outer circumferential surface, the sleeve 32 is a nut form a thread on the inner circumferential surface bar, the spindle shaft 31 is screwed to the sleeve 32 male and female do. That is, the sleeve 32 converts the rotational movement of the spindle shaft 31 into linear movement and moves forward and backward in the piston 21.

In addition, the actuator 41 includes an electric motor (not shown) and a plurality of gears (not shown) that generate rotational force, and the power generated by the electric motor is transferred to the spindle shaft 31. The spindle shaft 31 is transmitted by reducing the rotation speed.

The electric parking brake device 100 configured as described above is rotated by the rotational force of the spindle shaft 31 acting on the piston 21, so that rotation occurs at the contact surface of the piston 21 and the base plate 15 mentioned above. One-sided contact, uneven wear, and abnormal noise of the friction pad 11 may occur due to abrasion of the base plate 15, and oil leakage may occur due to warpage of the rubber boot 16 and the oil seal 17.

Thus, the exemplary embodiment of the present invention provides an electric parking brake device 100 that can prevent the rotation of the piston 21 acting the rotational force of the spindle shaft 31.

The electric parking brake apparatus 100 according to the present exemplary embodiment has a structure capable of converting a rotary motion acting on the piston 21 into a linear motion with respect to the cylinder portion 20a of the caliper housing 20.

To this end, the electric parking brake device 100 according to the exemplary embodiment of the present invention may be coupled to the caliper housing 20 and the piston 21 as protrusions and grooves.

That is, the protrusions and grooves of the caliper housing 20 and the piston 21 prevent the rotation of the piston 21 and serve to guide the linear movement of the piston 21.

Specifically, as shown in FIG. 2, a plurality of coupling protrusions 61 are formed on the inner circumferential surface of the cylinder portion 20a of the caliper housing 20, and the coupling protrusion 61 of the cylinder portion 20a is formed on the outer circumferential surface of the piston 21. ) Is formed a defect groove 71 that can be coupled.

Here, the engaging projection 61 is formed in the inner circumferential surface of the cylinder portion 20a long along the longitudinal direction of the piston 21 as a predetermined length, the engaging groove 71 is along the longitudinal direction on the outer circumferential surface of the piston 21. It can be formed long as a certain length.

Therefore, according to the electric parking brake device 100 for a vehicle according to an exemplary embodiment of the present invention configured as described above, when the driver operates the operation switch (not shown) for parking, the actuator shaft 41 by the actuator 41 31 rotates, whereby the axial movement of the sleeve 32 takes place and the sleeve 32 brakes through the friction pad 11 by pressing the piston 21.

That is, the piston 21 is advanced to the disk (D) side and press one side friction pad 11 to the disk (D), the caliper housing by the reaction force acting between the piston 21 and one side friction pad (11) 20 moves in a direction opposite to the direction in which the piston 21 moves, whereby the finger portion 20b provided on the other side of the caliper housing 20 presses the other friction pad 11 onto the disk D. FIG. Braking is achieved by the frictional force acting between the two friction pads 11 and the disk D.

In this process, in the present embodiment, the rotational force of the spindle shaft 31 acts on the piston 21, so that the rotation of the piston 21 may occur at the contact surface of the piston 21 and the base plate 15 mentioned above.

However, in the present embodiment, a plurality of engaging projections 61 are formed on the inner circumferential surface of the cylinder portion 20a of the caliper housing 20, and the engaging projection 61 of the cylinder portion 20a is coupled to the outer circumferential surface of the piston 21. Since the defective groove 71 is formed, the piston 21 prevents the rotation of the piston 21 and the rotational motion acting on the piston 21 is linear with respect to the cylinder portion 20a of the caliper housing 20. Can be converted to

Therefore, in this embodiment, since the rotational motion which acts on the piston 21 can be converted into linear motion with respect to the cylinder part 20a of the caliper housing 20, preventing the rotation of the piston 21, the piston 21 The rotational force acting on) can be converted into braking torque for the friction pad 11.

As a result, in this embodiment, the braking torque for the disk D can be increased, and the rotation of the piston 21 can be prevented, so that the frictional contact 11 of the friction pad 11 due to abrasion of the base plate 15 is worn. It is possible to prevent the occurrence of abnormal noise, and the like, and it is possible to prevent the leakage of oil due to the twisting of the rubber boot 16 and the oil seal 17.

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 exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10 ... carrier 11 ... friction pad
20 ... caliper housing 21 ... piston
31 ... spindle axis 32 ... sleeve
41 ... actuator 61 ... engagement projection
71. Coupling groove

Claims (4)

A caliper housing fixed to the vehicle body, a caliper housing installed on the carrier so as to move forward and backward, a pair of friction pads installed on the carrier so as to move forward and backward in between the disk, and the caliper An electric parking brake apparatus for a vehicle, comprising a piston configured to move forward and backward in a cylinder unit provided in a housing and pressurizing any one of a pair of friction pads with a disk.
A spindle shaft rotatably installed in the cylinder portion, a sleeve screwed to the spindle shaft and moving forward and backward according to the rotation of the spindle shaft, and pressurizing and releasing the piston, and the caliper housing and rotating the spindle shaft. Include actuators to
And the caliper housing and the piston are mutually coupled as protrusions and grooves. The method according to claim 1,
And the projection and the groove prevent the rotation of the piston and guide the linear movement of the piston. The method according to claim 1 or 2,
At least one coupling protrusion is formed on an inner circumferential surface of the cylinder portion of the caliper housing,
Electric parking brake device for a vehicle, characterized in that the groove formed on the outer circumferential surface of the piston can be coupled to the coupling protrusion. The method of claim 3,
The engaging projection is formed long in the longitudinal direction of the piston on the inner peripheral surface of the cylinder portion,
The coupling groove is an electric parking brake apparatus for a vehicle, characterized in that formed in the longitudinal direction on the outer circumferential surface of the piston.
KR1020100121634A 2010-12-01 2010-12-01 Electronic parking brake system for vehicle KR20120060069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100121634A KR20120060069A (en) 2010-12-01 2010-12-01 Electronic parking brake system for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100121634A KR20120060069A (en) 2010-12-01 2010-12-01 Electronic parking brake system for vehicle

Publications (1)

Publication Number Publication Date
KR20120060069A true KR20120060069A (en) 2012-06-11

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Application Number Title Priority Date Filing Date
KR1020100121634A KR20120060069A (en) 2010-12-01 2010-12-01 Electronic parking brake system for vehicle

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101650443B1 (en) 2015-03-20 2016-08-23 이래오토모티브시스템 주식회사 Electric parking brake
KR20160113763A (en) 2015-03-23 2016-10-04 이래오토모티브시스템 주식회사 Electric parking brake
KR20160113786A (en) * 2015-03-23 2016-10-04 현대모비스 주식회사 Rotation prevention apparatus for moving nut of electro-mechanical brake
CN107345545A (en) * 2016-05-04 2017-11-14 现代自动车株式会社 Dynamo-electric brake for vehicle
CN111075860A (en) * 2019-12-17 2020-04-28 张和平 Floating caliper type electromagnetic brake for new energy automobile
EP3974265A1 (en) * 2020-09-29 2022-03-30 Kema Enterprise Co., Ltd. Motor transmission unit for electronic parking brake device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101650443B1 (en) 2015-03-20 2016-08-23 이래오토모티브시스템 주식회사 Electric parking brake
KR20160113763A (en) 2015-03-23 2016-10-04 이래오토모티브시스템 주식회사 Electric parking brake
KR20160113786A (en) * 2015-03-23 2016-10-04 현대모비스 주식회사 Rotation prevention apparatus for moving nut of electro-mechanical brake
CN107345545A (en) * 2016-05-04 2017-11-14 现代自动车株式会社 Dynamo-electric brake for vehicle
US10060488B2 (en) 2016-05-04 2018-08-28 Hyundai Motor Company Electromechanical brake for vehicle
CN107345545B (en) * 2016-05-04 2021-04-16 现代自动车株式会社 Electromechanical brake for vehicle
CN111075860A (en) * 2019-12-17 2020-04-28 张和平 Floating caliper type electromagnetic brake for new energy automobile
EP3974265A1 (en) * 2020-09-29 2022-03-30 Kema Enterprise Co., Ltd. Motor transmission unit for electronic parking brake device

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