KR20100056134A - Electric disc brake - Google Patents

Electric disc brake Download PDF

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Publication number
KR20100056134A
KR20100056134A KR1020080115153A KR20080115153A KR20100056134A KR 20100056134 A KR20100056134 A KR 20100056134A KR 1020080115153 A KR1020080115153 A KR 1020080115153A KR 20080115153 A KR20080115153 A KR 20080115153A KR 20100056134 A KR20100056134 A KR 20100056134A
Authority
KR
South Korea
Prior art keywords
shaft
gear
motor
drive shaft
drive
Prior art date
Application number
KR1020080115153A
Other languages
Korean (ko)
Inventor
김주곤
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 KR1020080115153A priority Critical patent/KR20100056134A/en
Priority to US12/619,493 priority patent/US20100122877A1/en
Priority to DE102009053526A priority patent/DE102009053526B4/en
Priority to CN200910246864A priority patent/CN101782119A/en
Publication of KR20100056134A publication Critical patent/KR20100056134A/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
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • 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

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

Abstract

The present invention relates to an electric disc brake capable of exhibiting a large braking force. The electric disc brake according to the present invention includes friction pads for pressurizing the disk, a carrier for supporting the friction pads, a caliper housing supported on the carrier for pressurization of the friction pads, and a pressing device for pressing the friction pad. The pressing device includes a pressing member removably installed in the caliper housing to press one of the friction pads, a screw shaft coupled to the pressing member, a worm wheel coupled to the screw shaft, and disposed to intersect the screw shaft. It includes a drive shaft having a worm gear coupled to the, and a motor for rotating the drive shaft in the forward and reverse directions.

Description

Electric Disc Brake {ELECTRIC DISC BRAKE}

The present invention relates to an electric disc brake, and more particularly, to an electric disc brake capable of exhibiting a large braking force.

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 Laid-Open Patent Publication No. 2003-93691 discloses such an electric disc brake. The disc brake includes a motor for forward rotation and reverse rotation for braking and releasing braking, a screw gear portion coupled to the rotating shaft of the motor, and a piston for pressing the friction pad while retreating by rotation of the screw gear portion.

However, such an electric disc brake has a drawback in that it is difficult to exert a large braking force because the screw gear part for advancing the piston is directly connected to the rotating shaft of the motor.

It is an object of the present invention to provide an electric disc brake capable of exerting a great braking force.

The electric disc brake according to the present invention for achieving the above object is a caliper housing which is supported by the friction pads for pressurizing the disk, the carrier for supporting the friction pads, and the retractable support on the carrier for pressurizing the friction pads. And a pressurizing device for pressurizing the friction pad, wherein the pressurizing device includes a pressurizing member removably installed in the caliper housing to pressurize one of the friction pads, a screw shaft coupled to the pressurizing member, and the screw. And a drive shaft having a worm wheel coupled to the shaft, intersecting the screw shaft, and having a worm gear coupled to the worm wheel, and a motor for rotating the drive shaft in the forward and reverse directions.

The pressurization device further includes a reduction gear device provided on the shaft of the motor and the drive shaft to reduce and transfer the rotation of the motor to the drive shaft.

The reduction gear device may include a drive gear installed on the shaft of the motor and a driven gear installed on the drive shaft so as to mesh with the drive gear and having more teeth than the drive gear.

The reduction gear device includes a sun gear installed on the shaft of the motor, a plurality of planetary gears disposed around the sun gear to mesh with the sun gear, and internal gears fixed to the outer side of the planetary gears to mesh with the planetary gears. It may include a gear and a carrier connecting the shaft of the planetary gear and the drive shaft.

In the electric disc brake according to the present invention, since the rotation of the motor is first decelerated by the reduction gear device and the second deceleration is performed by the worm gear and the worm wheel, the pressing member can press the first friction pad with a large force to exert a large braking force. Can be.

In addition, the present invention, since the first and second deceleration is made in the process of the rotation of the motor is transmitted to the screw shaft, it is possible to obtain a sufficient braking force even if the motor having a smaller size and output than the conventional one can reduce the volume of the device by that much It has an effect.

In addition, the present invention can prevent the problem that the device is too long in the screw axis direction because the direction of the screw shaft and the motor axis can be different so that the motor can be mounted on the lower part of the caliper housing body.

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

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 Pressurization 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 the 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).

As shown in FIGS. 1 and 2, the pressurizing device 40 is a pressurizing member installed in the body 21 of the caliper housing 20 in order to pressurize and release 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 reduction gear device 50 provided on the shaft 46a of the motor and the driving shaft 44 so as to reduce and transmit the rotation of the motor shaft 46a to the driving 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.

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 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.

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. 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. In addition, the shaft 46a of the motor 46 and the drive shaft 44 extending outward of the body portion 21 are connected to the power transmission by the reduction gear device 50.

The reduction gear device 50 shown in FIG. 2 includes a drive gear 51 provided on the shaft 46a of the motor, and a driven gear 52 provided on the drive shaft 44 to engage with the drive gear 51. Form. The deceleration gear device 50 is configured such that the number of teeth of the driven gear 52 is larger than the number of teeth of the drive gear 51 to realize deceleration. The arrangement of the drive gear 51 and the driven gear 52 can be adjusted according to the mounting position of the motor 46, and their size can be changed for adjustment of the reduction ratio.

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 reduction gear device 50. At this time, since the first deceleration is performed by the reduction gear device 50, the rotational force transmitted to the drive shaft 44 is increased instead of the rotation speed of the drive shaft 44 is decreased.

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. 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.

The electric disc brake is transmitted to the screw shaft 42 by the reduction ratio since the rotation of the motor 46 is primarily decelerated by the reduction gear device 50 and the second reduction is performed by the worm gear 45 and the worm wheel 43. Rotational force increases. Therefore, the pressing member 41 can press the first friction pad 11 with a large force, thereby exhibiting a large braking force.

Therefore, the electric disc brake can reduce the volume of the device because a sufficient braking force can be obtained even if a motor having a smaller size than the conventional one is employed. In addition, since the direction of the screw shaft 42 and the direction of the shaft 46a of the motor 46 can be different, the device can be mounted on the lower portion of the caliper housing body 21 so that the device can be mounted on the screw shaft ( 42) The problem of being too long in the longitudinal direction can also be prevented. This reduces the footprint of the installation space when mounting the device to a vehicle, making it easier to mount.

Figure 3 shows another embodiment of the reduction gear device for connecting the shaft and the drive shaft of the motor. The reduction gear device 60 of FIG. 3 includes a sun gear 61 provided on the shaft 46a of the motor, and a plurality of planetary gears 62 disposed around the sun gear 61 so as to be engaged with the sun gear 61. , A carrier connecting the internal gear 63 fixed to the outer side of the planetary gears 62 so as to mesh with the planetary gears 62, and the shaft 64 of the planetary gears 62 and the drive shaft 44. 65). The reduction gear device 60 is 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 through the carrier 65 By being transmitted to the drive shaft 44, the deceleration rotation of the drive shaft 44 is made.

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

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

Figure 3 shows another embodiment of the electric disc brake reduction gear device according to the present invention.

* Description of the symbols for the main parts of the drawings *

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

50: reduction gear device 51: drive gear

52: driven gear

Claims (4)

Friction pads for pressurizing the disk, a carrier for supporting the friction pads, a caliper housing removably supported on the carrier for pressurizing the friction pads, and a pressing device for pressing the friction pad, The pressurizing device is arranged to intersect with the screw shaft, a pressing member removably installed in the caliper housing to press one of the friction pads, a screw shaft coupled to the pressing member, a worm wheel coupled to the screw shaft, And a drive shaft having a worm gear coupled to the worm wheel, and a motor for rotating the drive shaft in a forward direction and a reverse direction. The method of claim 1, The pressurization device further comprises a reduction gear device provided on the shaft and the drive shaft of the motor to reduce the transmission of the rotation of the motor to the drive shaft. The method of claim 2, The speed reduction gear device includes a drive gear installed on the shaft of the motor, and a drive gear installed on the drive shaft so as to mesh with the drive gear, and a driven gear having more teeth than the drive gear. The method of claim 2, The reduction gear device includes a sun gear installed on the shaft of the motor, a plurality of planetary gears disposed around the sun gear to mesh with the sun gear, and internal gears fixed to the outer side of the planetary gears to mesh with the planetary gears. An electric disc brake comprising a gear and a carrier connecting the shaft of the planetary gears and the drive shaft.
KR1020080115153A 2008-11-19 2008-11-19 Electric disc brake KR20100056134A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020080115153A KR20100056134A (en) 2008-11-19 2008-11-19 Electric disc brake
US12/619,493 US20100122877A1 (en) 2008-11-19 2009-11-16 Electric disc brake
DE102009053526A DE102009053526B4 (en) 2008-11-19 2009-11-16 Electric disc brake
CN200910246864A CN101782119A (en) 2008-11-19 2009-11-19 Electric disc brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080115153A KR20100056134A (en) 2008-11-19 2008-11-19 Electric disc brake

Publications (1)

Publication Number Publication Date
KR20100056134A true KR20100056134A (en) 2010-05-27

Family

ID=42280345

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080115153A KR20100056134A (en) 2008-11-19 2008-11-19 Electric disc brake

Country Status (1)

Country Link
KR (1) KR20100056134A (en)

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A201 Request for examination
E601 Decision to refuse application