KR20100083601A - Electric disc brake - Google Patents

Electric disc brake Download PDF

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Publication number
KR20100083601A
KR20100083601A KR1020090003066A KR20090003066A KR20100083601A KR 20100083601 A KR20100083601 A KR 20100083601A KR 1020090003066 A KR1020090003066 A KR 1020090003066A KR 20090003066 A KR20090003066 A KR 20090003066A KR 20100083601 A KR20100083601 A KR 20100083601A
Authority
KR
South Korea
Prior art keywords
reducer
drive shaft
gear
pressing member
disc brake
Prior art date
Application number
KR1020090003066A
Other languages
Korean (ko)
Inventor
김명준
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 KR1020090003066A priority Critical patent/KR20100083601A/en
Publication of KR20100083601A publication Critical patent/KR20100083601A/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
    • 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
    • F16D2121/24—Electric or magnetic using motors
    • 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
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur gears
    • 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
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/50—Rotating members in mutual engagement with parallel non-stationary axes, e.g. planetary gearing
    • 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
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/52—Rotating members in mutual engagement with non-parallel stationary axes, e.g. worm or bevel gears

Abstract

The present invention relates to an electric disc brake which prevents the reaction force of the pressing member generated in braking direction from being transmitted to the reducer. The electric disc brake of the present invention supports friction pads for pressurizing the disc and the friction pads. And a caliper housing removably supported by the carrier for pressurizing the friction pads, and a pressing device for pressing the friction pad, wherein the pressing device presses the caliper housing to press one of the friction pads. A pressurizing member provided to be able to move forward and backward, a screw shaft coupled to the pressurizing member, a motor for generating rotational force in a forward direction and a reverse direction, and a speed reducer for amplifying and transmitting the rotational force generated from the motor, Reaction force generated in the advancing and retracting direction of the pressing member during braking operation It said speed reducer is arranged to be prevented from being transmitted.

Description

Electric Disc Brake {ELECTRIC DISC BRAKE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric disc brake, and more particularly, to an electric disc brake in which forward and backward reaction force of a pressing member generated during braking is prevented from being transmitted to a reducer.

Electric disc brakes, unlike the conventional hydraulic disc brakes, employ an electrically operated motor as a power source of the driving device for pressing the friction pad.

Korean Patent Laid-Open Publication No. 2000-0014476 discloses an example of such an electric disc brake. The disclosed electric disc brake includes a disc that rotates together with a wheel of a vehicle, first and second friction pads disposed on both sides of the disc to press the disk, and retractably installed to press the first and second friction pads. It includes a pressure member, a motor for generating a driving force, and a reducer for amplifying and transmitting the driving force generated from the motor to the pressure member.

However, in the conventional electric disc brake, there is a problem that the first and second friction pads are in close contact with both sides of the disc, that is, the reaction force of the pressing member generated in the braking process is transmitted to the reducer.

The present invention is to solve such a problem, it is an object of the present invention to provide an electric disc brake that is prevented from being transmitted to the speed reducer reaction force of the pressing member generated during braking.

An electric disc brake according to a preferred embodiment of the present invention for achieving the above object is capable of retracting the friction pads for pressurizing the disk, the carrier for supporting the friction pads, and the carrier for pressing the friction pads. A caliper housing supported and a pressurizing device for pressing the friction pad, wherein the pressurizing device includes a pressing member removably installed in the caliper housing to press one of the friction pads, and a screw shaft coupled to the pressing member. And a motor that generates rotational force in a forward and reverse direction, and a speed reducer that amplifies the rotational force generated from the motor and transmits the rotational force to the screw shaft. The reducer can be arranged to prevent transmission.

The reducer may be one of a planetary gear reducer, a harmonic reducer, and a worm gear reducer.

The gear reducer may include a sun gear installed on a shaft of the motor, a plurality of planetary gears disposed around the sun gear to mesh with the sun gear, and the planetary gears to be engaged with the planetary gears. It may include an internal gear fixed to the outside, and a carrier connecting the planetary gears.

In addition, the rotation center of the sun gear and the advancing direction of the pressing member may be perpendicular to each other.

The drive shaft may further include a drive shaft having a worm wheel coupled to the screw shaft and a worm gear disposed to intersect the screw shaft and coupled to the worm wheel, wherein the drive shaft may be connected to the carrier.

In addition, the rotation center of the sun gear and the advancing direction of the pressing member may be parallel to each other.

The drive shaft may further include a drive shaft coupled to a first spur gear coupled to the screw shaft and a second spur gear engaged with the first spur gear, wherein the drive shaft may be connected to the carrier.

In addition, further comprising a drive shaft connected to the output side of the reducer, the center of rotation of the drive shaft and the advancing direction of the pressing member may be perpendicular to each other.

In addition, further comprising a drive shaft connected to the output side of the reducer, the center of rotation of the drive shaft and the advancing direction of the pressing member may be parallel to each other.

In the electric disc brake according to the present invention, the forward and backward reaction force of the pressing member generated during braking is prevented from being transmitted to the speed reducer.

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

1 is a cross-sectional view of an electric disc brake according to a first embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line AA 'of FIG.

Disc brake according to the present invention, as shown in Figure 1, the disk 10 to rotate with the wheels of the vehicle, respectively, on both sides of the disk 10 to pressurize both sides of the disk 10 to perform braking Pressing installed in the caliper housing 20 for pressurizing the first and second friction pads 11 and 12, the first and second friction pads 11 and 12, and the braking operation 20 for braking operation. Apparatus 40 is provided.

The first and second friction pads 11 and 12 are supported by the carrier 30 fixed to the vehicle body so as to be able to move forward and backward toward both sides of the disk 10, and the caliper housing 20 is also supported by the first and second friction pads 11 and 12. FIG. The second friction pads 11 and 12 are supported by the carrier 30 so as to advance and retreat in the pressing direction.

The caliper housing 20 has a hollow body portion 21, an extension portion 22 extending from the body portion 21 toward the second friction pad 12, and a rear surface of the second friction pad 12 to support the caliper housing 20. And a finger portion 23 connected to the extension portion 22. And the pressing device 40 is mounted to the body portion 21 of the caliper housing 20 to press the first friction pad (11).

1 and 2, the pressurizing device 40 is a pressurizing member installed in the body portion 21 of the caliper housing 20 to be retractable for pressurizing and releasing the first friction pad (11). (41), the screw shaft 42 coupled to the pressing member 41, the worm wheel 43 coupled to the screw shaft 42, the worm gear is installed to intersect with the screw shaft 42 and coupled to the worm wheel 43 ( A drive shaft 44 with 45, and a motor 46 for rotating the drive shaft 44 in the forward and reverse directions. In addition, the pressurizing device 40 includes a motor shaft 46a and a reducer 60 provided on the drive shaft 44 so as to reduce and transmit the rotation of the motor shaft 46a to the drive shaft 44.

The pressing member 41 is installed in the body portion 21 so as to move back and forth in a restricted state, and has a female screw portion 41a coupled to the screw shaft 42. The structure for limiting the rotation of the pressing member 41 is the outer surface of the pressing member 41 and the inner surface of the body portion 21 coupled correspondingly is polygonal or the outer surface and the body portion 21 of the pressing member 41. It can be implemented by the manner in which the guide means (not shown) in the form of a key and a key groove on the inner surface. Reference numeral X denotes an advancing direction of the pressing member.

The screw shaft 42 has a male screw portion 42a on one side so as to be coupled to the female screw portion 41a of the pressing member 41. The screw shaft 42 is rotatably installed in the body portion 21 so as to be parallel to the direction X in which the pressing member 41 moves forward and backward. In order to support the screw shaft 42, the first bearing 47 and the second bearing 48 are installed at positions spaced apart from each other in the body portion 21. At this time, the second bearing 48 is a thrust bearing, which is generated in the advancing direction x of the pressing member 41 during the braking operation and receives the reaction force transmitted through the screw shaft 42.

The worm wheel 43 is coupled to the outer surface of the screw shaft 42 so as to rotate in the empty space 27 inside the body portion 21, the drive shaft 44 is a worm gear 45 provided on the outer surface to the worm wheel 43 It is arrange | positioned in the direction which intersects the screw shaft 42 so that it may engage. That is, in the electric disc brake of the present embodiment, the center of rotation 44a of the drive shaft 44 and the advancing direction X of the pressing member 41 are arranged to be perpendicular to each other. The drive shaft 44 is rotatably supported by the body portion 21 and is installed such that a portion in which the worm gear 45 is installed enters the body portion 21, and one end thereof penetrates the lower side of the body portion 21 to allow the body. It extends out of the part 21.

The motor 46 is fixed to the lower portion of the body portion 21 of the caliper housing 20 by fastening the fixing screw 49. And the shaft 46a of the motor 46 and the drive shaft 44 extending outward of the body portion 21 is connected to the power transmission by the reducer 60.

As shown in FIG. 2, the reduction gear 60 includes a sun gear 61 installed on the shaft 46a of the motor and a plurality of planetary gears disposed around the sun gear 61 so as to mesh with the sun gear 61. 62, the internal gear 63 fixed to the outer side of the planetary gears 62 to engage with the planetary gears 62, the shaft 64 of the planetary gears 62, and the drive shaft 44. It is a form including a carrier 65 for connecting. The speed reducer 60 is driven by the planetary gears 62 when the sun gear 61 is rotated by the operation of the motor 46, the revolution of the planetary gears 62 is driven by the drive shaft 44 through the carrier 65 By being transmitted to the deceleration rotation of the drive shaft 44 is made.

The following describes the operation of the electric disc brake.

When the driver brakes, the motor 46 rotates for braking. When the driver releases the braking, the motor 46 rotates in reverse to release the brake.

When the motor 46 rotates for braking, the rotational force of the motor 46 is transmitted to the drive shaft 44 via the reducer 60.

When the worm gear 45 rotates by the rotation of the drive shaft 44, the worm wheel 43 rotates, and the screw shaft 42 rotates by the rotation of the worm wheel 43. At this time, since the deceleration is secondarily caused by the large reduction ratio of the worm gear 45 and the worm wheel 43, the rotational force transmitted to the screw shaft 42 becomes larger as the rotation speed of the screw shaft 42 is lowered.

When the screw shaft 42 rotates, the pressing member 41 advances toward the first friction pad 11 to press the first friction pad 11, and the caliper housing 20 causes the pressing member 41 to react. The braking is performed by moving in the reverse direction of the finger 23 to press the second friction pad 12 toward the disk 10. At this time, a considerable magnitude of reaction force is generated in the advancing and retracting direction of the pressing member 41, and is transmitted to the second bearing 42 through the screw shaft 42.

When the motor 46 rotates in reverse to release the braking, the braking is released by the pressing member 41 moving in the direction of releasing the pressurization of the first friction pad 11.

As described above, in the electric disc brake of the present embodiment, the screw shaft 42 is not directly connected to the reducer 60, so that reaction force generated during the braking operation is prevented from being transmitted directly to the reducer 60. FIG. Instead, the reaction force generated during the braking operation is absorbed by the second bearing 48. Therefore, in the electric disc brake of the present embodiment, the life of the reducer 60 is extended. Of course, there is no need to use a specially designed reducer to increase durability, and a general reducer can be used.

3 is a cross-sectional view of the electric disc brake according to the second embodiment of the present invention. For reference, the same components as those described in the first embodiment are omitted, and the same reference numerals are used.

As shown in FIG. 3, the pressurizing device 140 of the present embodiment is a pressurizing member installed in the body portion 21 of the caliper housing 20 so as to be retracted and pressurized and released from the first friction pad 11. (41), the screw shaft 42 coupled to the pressing member 41, the first spur gear 143 coupled to the screw shaft 42, is installed in parallel with the screw shaft 42 and the first spur gear 143 ) And a drive shaft 144 to which the second spur gear 145 engaged with each other is coupled, and a motor 46 to rotate the drive shaft 144 in a forward direction and a reverse direction. In addition, the pressurizing device 140 includes a reducer 60 installed in the shaft 46a of the motor and the drive shaft 144 so as to reduce and transmit the rotation of the motor shaft 46a to the drive shaft 144. At this time, in the electric disc brake of the present embodiment, the rotation center 144a of the drive shaft 144 and the advancing direction x of the pressing member 41 are arranged to be parallel to each other.

Therefore, in the electric disc brake of the present embodiment, the reaction force generated in the advancing direction x of the pressing member 41 during the braking operation is prevented from being transmitted directly to the reducer 60.

In addition to this, the present invention may be variously modified. For example, the reducer described herein is a planetary gear reducer, but the reducer may be a harmonic reducer, a worm gear reducer, or the like.

1 is a cross-sectional view of an electric disc brake according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1.

3 is a cross-sectional view of the electric disc brake according to the second embodiment of the present invention.

Description of the Related Art [0002]

10: disc 11: first friction pad

12: second friction pad 20: caliper housing

30: carrier 40: pressurizing device

41: pressure member 42: screw shaft

43: worm wheel 44: drive shaft

45: worm gear 46: motor

60: reduction gear device

Claims (9)

An electric motor including friction pads for pressurizing the disk, a carrier for supporting the friction pads, a caliper housing removably supported on the carrier for pressurization of the friction pads, and a pressing device for pressing the friction pad. In disc brake, The pressurizing device includes a pressurizing member installed in the caliper housing so as to pressurize one of the friction pads, a screw shaft coupled to the pressurizing member, a motor for generating rotational force in a forward direction and a reverse direction, and generated from the motor. It is provided with a reducer that amplifies the rotational force and transmits to the screw shaft, And the speed reducer is disposed so that reaction force generated in the advancing and retracting direction of the pressing member is prevented from being transmitted to the speed reducer during the braking operation. The method of claim 1, The speed reducer is an electric disc brake, characterized in that one of the planetary gear reducer, harmonic reducer, worm gear reducer. The method of claim 1, The gear reducer may include a sun gear installed on a shaft of the motor, a plurality of planetary gears disposed around the sun gear to mesh with the sun gear, and an outer side of the planetary gears to be engaged with the planetary gears. An electric disc brake comprising a fixed internal gear and a carrier connecting the planetary gears. The method of claim 3, And the rotation center of the sun gear and the advancing direction of the pressing member are perpendicular to each other. The method of claim 4, wherein And a drive shaft having a worm wheel coupled to the screw shaft and a worm gear disposed to intersect the screw shaft and coupled to the worm wheel. And the drive shaft is connected to the carrier. The method of claim 3, And the rotation center of the sun gear and the advancing direction of the pressing member are parallel to each other. The method of claim 6, And a driving shaft coupled to the first spur gear coupled to the screw shaft and the second spur gear meshed with the first spur gear, And the drive shaft is connected to the carrier. The method of claim 1, Further comprising a drive shaft connected to the output side of the reducer, And the rotation center of the drive shaft and the advancing direction of the pressing member are perpendicular to each other. The method of claim 1, Further comprising a drive shaft connected to the output side of the reducer, And the rotation center of the drive shaft and the advancing direction of the pressing member are parallel to each other.
KR1020090003066A 2009-01-14 2009-01-14 Electric disc brake KR20100083601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090003066A KR20100083601A (en) 2009-01-14 2009-01-14 Electric disc brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090003066A KR20100083601A (en) 2009-01-14 2009-01-14 Electric disc brake

Publications (1)

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KR20100083601A true KR20100083601A (en) 2010-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090003066A KR20100083601A (en) 2009-01-14 2009-01-14 Electric disc brake

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107605999A (en) * 2017-09-27 2018-01-19 广州市新域动力技术有限公司 Electronics caliper brake device
KR20180134460A (en) * 2017-06-08 2018-12-19 주식회사 유니크 Actuator for electronic parking brake
KR20180134461A (en) * 2017-06-08 2018-12-19 주식회사 유니크 Actuator for electronic parking brake

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180134460A (en) * 2017-06-08 2018-12-19 주식회사 유니크 Actuator for electronic parking brake
KR20180134461A (en) * 2017-06-08 2018-12-19 주식회사 유니크 Actuator for electronic parking brake
CN107605999A (en) * 2017-09-27 2018-01-19 广州市新域动力技术有限公司 Electronics caliper brake device

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