WO2021181810A1 - Electric parking brake device - Google Patents

Electric parking brake device Download PDF

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Publication number
WO2021181810A1
WO2021181810A1 PCT/JP2020/047374 JP2020047374W WO2021181810A1 WO 2021181810 A1 WO2021181810 A1 WO 2021181810A1 JP 2020047374 W JP2020047374 W JP 2020047374W WO 2021181810 A1 WO2021181810 A1 WO 2021181810A1
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WO
WIPO (PCT)
Prior art keywords
electric motor
parking brake
current
electric
reverse operation
Prior art date
Application number
PCT/JP2020/047374
Other languages
French (fr)
Japanese (ja)
Inventor
広地 碓井
宏夢 生川
サンディプ プラネ
真人 宇野
Original Assignee
日立Astemo株式会社
日信ブレーキシステムズ株式会社
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 日立Astemo株式会社, 日信ブレーキシステムズ株式会社 filed Critical 日立Astemo株式会社
Priority to JP2022505771A priority Critical patent/JPWO2021181810A1/ja
Publication of WO2021181810A1 publication Critical patent/WO2021181810A1/en

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Classifications

    • 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
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • 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
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter

Definitions

  • the present invention provides a parking brake lever that enables rotation between an operating position for obtaining a parking brake state and a non-operating position for releasing the parking brake state, and is elastically urged toward the non-operating position side.
  • An electric motor capable of switching between a normal rotation state that exerts power to move the parking brake lever from the non-operating position to the operating position and a reversing state when the parking brake lever is returned from the operating position to the non-operating position side.
  • An electric actuator that is connected to the parking brake lever and is capable of applying a load to the electric motor when the electric motor is reversed, and a current detecting means that detects an energizing current to the electric motor.
  • the present invention relates to an electric parking brake device including a unit.
  • the parking brake lever is moved to the operating position by the operation of the electric actuator to obtain the parking brake state, and the parking braking force is released according to the operation of the electric actuator so as to move the parking brake lever to the non-operating position.
  • An electric parking brake device for a vehicle is known in Patent Document 1.
  • the state of the braking gap automatic adjusting means that automatically adjusts the gap between the pair of brake shoes and the brake drum at the time of the previous parking brake, or while the electric actuator is operating to enter the parking brake state.
  • the load applied to the electric motor increases when the electric motor is in a no-load state under normal conditions and should be within the current stable period.
  • the stop timing of the electric motor is delayed.
  • the present invention has been made in view of such circumstances, and even if a load is applied to the electric motor within a period in which the electric motor should basically be in a no-load state when the parking brake state is released, the present invention is promptly made. It is an object of the present invention to provide an electric parking brake device capable of stopping the operation of an electric motor.
  • the present invention enables rotation between the operating position for obtaining the parking brake state and the non-operating position for releasing the parking brake state, and is repelled toward the non-operating position side.
  • the parking brake lever that is forced, the normal rotation state that exerts the power to move the parking brake lever from the non-operating position to the operating position, and the reverse rotation when the parking brake lever is returned from the operating position to the non-operating position side.
  • An electric actuator having an electric motor whose state can be switched and being connected to the parking brake lever and capable of applying a load to the electric motor when the electric motor is reversed, and energization of the electric motor.
  • the current detecting means for detecting the current and the reversing operation of the electric motor are stopped according to the inclination of the current value detected by the current detecting means when the reversing operation of the electric motor becomes a predetermined value or more.
  • the control unit has a set time in which a rush current is assumed to be generated during the reverse operation of the electric motor elapses from the start of the reverse operation of the electric motor.
  • the first feature is that the reverse operation stop of the electric motor is determined by the inclination of the current value based on the current value detected by the current detecting means.
  • the control unit when the control unit cannot determine the operation stop due to the inclination of the current value, the current value detected by the current detecting means reaches the reference value.
  • the second feature is that the reverse operation of the electric motor is sometimes stopped.
  • control unit in addition to the configuration of the first or second feature, has the electric motor according to the inclination of the current value to be greater than or equal to the second predetermined value larger than the predetermined value.
  • the third feature is to determine that is abnormal.
  • the slope of the current value becomes equal to or higher than a predetermined value within a period in which a stable current value should basically be obtained.
  • the reverse operation of the electric motor is stopped when the current value reaches the reference value, so that the voltage is extremely low.
  • the reverse operation of the electric motor can be stopped by the current value.
  • the reverse operation of the electric motor is performed. It can be determined that it is in an abnormal state as well as stopped.
  • FIG. 1 is a front view of the drum brake.
  • FIG. 2 is a rear view of the drum brake.
  • FIG. 3 is a vertical cross-sectional view of the electric actuator.
  • FIG. 4 is a block diagram showing a configuration for reverse operation stop control of the electric motor.
  • FIG. 5 is a diagram showing an example of changes in the current value (a) and the slope (b) of the current value during the reverse operation of the electric motor.
  • a drum brake B is provided on a wheel of a four-wheeled vehicle, for example, the left rear wheel, and the drum brake B is fixed with a through hole 12 in the center for penetrating the axle 11 of the left rear wheel.
  • the first and second brake shoes 15, 16 and the first and second brake shoes 15 and 16 arranged in the back plate 13 so as to be slidable with the back plate 13 and the inner circumference of the brake drum 14 rotating with the left rear wheel.
  • a braking gap automatic adjusting means (so-called auto adjuster) 18 for automatically adjusting the gap and a return spring 19 provided between the first and second brake shoes 15 and 16 are provided.
  • the first and second brake shoes 15 and 16 include the first and second webs 15a and 16a formed in a bow-shaped flat plate shape along the inner circumference of the brake drum 14, and their first and second brake shoes 15a and 16a.
  • the first and second rims 15b and 16b are connected so as to be orthogonal to the outer periphery of the second webs 15a and 16a, and the first and second rims 15b and 16b attached to the outer periphery of the first and second rims 15b and 16b. It consists of a second lining 15c and 16c.
  • an anchor plate 21 serving as a fulcrum during expansion and contraction of the first and second brake shoes 15 and 16 is provided at one end of the first and second webs 15a and 16a (this embodiment). Then, the lower end portion) is fixed so as to be rotatably supported. Further, the wheel cylinder 17 is operated by the output hydraulic pressure of a master cylinder (not shown) operated by a brake pedal to expand the first and second brake shoes 15 and 16 with the anchor plate 21 as a fulcrum. A pair of pistons 20 included in the wheel cylinder 17 are fixed to the back plate 13 between the other ends of the first and second brake shoes 15 and 16 so as to exert a driving force to the side. The outer end portion is arranged so as to face the other end portion (upper end portion in this embodiment) of the first and second webs 15a and 16a.
  • a coil spring 22 is provided between the one ends of the first and second webs 15a and 16a to urge the one ends of the first and second webs 15a and 16a toward the anchor plate 21.
  • a pair of return springs 19 for urging the first and second brake shoes 15 and 16 in the contraction direction are provided between the other ends of the first and second webs 15a and 16a.
  • the braking gap automatic adjusting means 18 is provided between the first and second webs 15a and 16a of the first and second brake shoes 15 and 16, and is a contraction position regulating that can be extended by rotation of the adjusting gear 23. It has a strut 24 and a feed claw 25a that engages with the adjust gear 23, and can rotate to the second web 16a of the second brake shoe 16 of the first and second brake shoes 15 and 16. It is composed of an adjusting lever 25 that is supported and an adjusting spring 26 that rotates and urges the adjusting lever 25 to the side that rotates the adjusting gear 23 in a direction that extends the contraction position regulating strut 24.
  • the contraction position regulating strut 24 regulates the contraction positions of the first and second brake shoes 15 and 16, and the first brake shoe 15 of the first and second brake shoes 15 and 16 is provided.
  • a first rod 27 having a first engaging connecting portion 27a that engages with the other end of the first web 15a and a second web 16a provided with the second brake shoe 16 near the other end.
  • a second rod 28 having a second engaging connecting portion 28a that engages with the first rod 27 and arranged coaxially with the first rod 27, and one end of the first rod 27 being inserted into the first rod 27 so as to be relatively movable in the axial direction.
  • the two rods 28 have an adjusting bolt 29 whose other end is coaxially screwed, and the adjusting gear 23 is arranged between the first and second rods 27 and 28 to provide an outer circumference of the adjusting bolt 29. Is formed in.
  • a first locking recess 30 for engaging the first engaging connecting portion 27a is provided on the side edge of the first web 15a near the other end and facing the axle 11 side, and the second web 16a is provided.
  • a second locking recess 31 for engaging the second engaging connecting portion 28a is provided on the side edge facing the axle 11 side near the other end of the above.
  • the adjusting lever 25 having a feed claw 25a that engages with the adjusting gear 23 is rotatably supported by the second web 16a via a support shaft 32, and is rotatably supported between the second web 16a and the adjusting lever 25. Is provided with the adjust spring 26. Moreover, the spring force of the adjust spring 26 is set to be smaller than the spring force of the return spring 19.
  • the first and second linings 15c and 16c are worn when the first and second brake shoes 15 and 16 are extended by the operation of the wheel cylinder 17.
  • the adjustment lever 25 is expanded by a certain value or more due to the above, the adjust lever 25 is rotated around the axis of the support shaft 32 by the spring force of the adjust spring 26, whereby the adjust gear 23 is rotated.
  • the effective length of the contraction position regulating strut 24 is increased and corrected accordingly.
  • the drum brake B includes a parking brake lever 34 capable of generating a parking brake force according to the operation, and the parking brake lever 34 is one of the first webs 15a of the first brake shoe 15.
  • the brake drum 14 is arranged so as to overlap with each other in a front view (direction shown in FIG. 1) in a direction along the rotation axis of the brake drum 14, and extends long along the longitudinal direction of the first web 15a.
  • An engaging piece 36 fixed to one end of the brake cable 37 is engaged with one end of the parking brake lever 34 (the lower end in this embodiment), and the other end of the parking brake lever 34 (this).
  • the upper end portion is connected to the other end portion of the first web 15a in the first brake shoe 15 via a pin 35.
  • the parking brake lever 34 When the parking brake of the vehicle is activated, the parking brake lever 34 is rotated and driven in the counterclockwise direction of FIG. 1 with the pin 35 as a fulcrum by the traction force input from the brake cable 37. Due to the rotation of the lever 34, a force in a direction in which the second lining 16c of the brake shoe 16 is pressed against the inner circumference of the brake drum 14 is applied to the second brake shoe 16 via the contraction position regulating strut 24. To work. Further, when the parking brake lever 34 is continuously rotated and driven in the counterclockwise direction of FIG. 1, the parking brake lever 34 engages with the first engaging connecting portion 27a of the contraction position regulating strut 24.
  • the parking brake lever 34 operates at an operating position where the first and second linings 15c and 16c of the first and second brake shoes 15 and 16 are in pressure contact with the inner circumference of the brake drum 14. , The parking brake state can be obtained in this state.
  • the first operation is performed by the spring force of the return spring 19 in a direction away from the inner circumference of the brake drum 14.
  • the parking brake lever 34 returns to the non-operating position together with the second brake shoes 15 and 16, and the parking brake lever 34 is urged toward the non-operating position side.
  • the brake cable 37 is towed by the power exerted by the electric actuator 38, and the electric actuator 38 has a screw shaft 39 connected to the brake cable 37 and the screw shaft 39.
  • An actuator case 40 that supports the screw shaft 39 so as to be able to reciprocate in the axial direction while blocking its rotation, an electric motor 41 that is housed and supported in the actuator case 40 with free forward and reverse rotation, and an electric motor 41 thereof.
  • a motion conversion mechanism 42 (FIG. 6), which is interposed between the electric motor 41 and the screw shaft 39 and is housed in the actuator case 40, while making it possible to convert the rotary motion generated in the screw shaft 39 into a linear motion of the screw shaft 39. 3) and.
  • the actuator case 40 of the electric actuator 38 is attached to the back plate 13 on the opposite side of the wheel cylinder 17 via the attachment member 43.
  • the mounting member 43 is fixed to the actuator case 40, and the mounting member 43 is fastened to the back plate 13 with a plurality of, for example, three bolts 44.
  • the brake cable 37 that is arranged outside the back plate 13 is covered with a tubular member, and in this embodiment, for example, a member formed by winding an iron wire rod into a coil shape.
  • the outer cable 45 covers at least a portion of the brake cable 37 that is arranged outside the back plate 13.
  • the tubular member may be a member that can receive a reaction force due to the output of the electric actuator 38, and a metal tubular member may be used instead of the outer cable 45.
  • the screw shaft 39 of the electric actuator 38 is connected to the brake cable 37 via a cable joint 51.
  • the connecting portion of the screw shaft 39 and the brake cable 37 is covered with a protective cylinder 50 coupled to the actuator case 40, and the end of the outer cable 45 on the electric actuator 38 side has a guide tube 52. It is attached to the protective cylinder 50 via.
  • a tubular portion 13a is integrally projected from the lower portion of the back plate 13 along the vehicle front-rear direction, and the brake cable 37 covered with the outer cable 45 is formed from the tubular portion 13a to the back plate.
  • the outer cable 45 is introduced into the cylinder portion 13, and the end portion of the outer cable 45 on the tubular portion 13a side is attached to the tubular portion 13a by a guide tube 53.
  • a holding plate 46 sandwiching the anchor plate 21 with the back plate 13 is formed by a pair of rivets 47 together with the anchor plate 21 to form the back plate.
  • a guide portion 46a which is attached to the lower part of the 13 and guides the brake cable 37 together with the outer cable 45, is integrally provided on the holding plate 46 so as to have a substantially U-shaped cross-sectional shape.
  • the actuator case 40 includes a case main body 57 integrally having first and second accommodating cylinders 55 and 56, a first cover member 58 coupled to an open end of the first accommodating cylinder 55, and a first cover member 58. It is composed of a cover member 58 of 1 and a second cover member 59 coupled to the case main body 57 from the opposite side.
  • the first accommodating cylinder portion 55 is formed in a bottomed cylindrical shape so that a first end wall portion 55a is provided at one end thereof, and is fitted to a central portion of the first end wall portion 55a.
  • the holes 60 are formed coaxially.
  • the second accommodating cylinder portion 56 is arranged on the side of the first accommodating cylinder portion 55, has one end opened, and is arranged in the intermediate portion in the longitudinal direction of the first accommodating cylinder portion 55. It is formed in a bottomed cylindrical shape so that the other end is closed by the end wall portion 56a, and a cylindrical tubular portion 56b surrounding the screw shaft 39 is integrated with the central portion of the second end wall portion 56a. It is thrust into. Further, a boot 80 is provided between the protruding end of the screw shaft 39 from the tubular portion 56b and the tubular portion 56b.
  • a cylindrical first bearing portion 63a that rotatably supports the motor shaft 64 is projected from one end portion of the motor case 63 of the electric motor 41 in the axial direction, and one end portion of the motor shaft 64 is the first bearing.
  • the bearing portion 63b is projected.
  • one end of the motor case 63 is brought into contact with the first end wall portion 55a while fitting the first bearing portion 63a into the fitting hole 60 of the case main body 57.
  • the electric motor 41 is accommodated in the first accommodating cylinder portion 55 in this way so that the other end of the motor case 63 on the side where the second bearing portion 63b is provided faces the outside. Is housed in the first storage tube portion 55.
  • the first cover member 58 covers the portion of the electric motor 41 housed in the first storage cylinder portion 55 that faces the outside from the first storage cylinder portion 55, and the first storage cylinder portion 55.
  • a lid portion 58a coupled to the opening end and a connector portion 58b (see FIG. 2) that projects laterally from the lid portion 58a and is arranged laterally of the first storage cylinder portion 55 are integrally provided.
  • a wave washer 66 is interposed between the second bearing portion 63b and the lid portion 58a of the electric motor 41.
  • the second cover member 59 is coupled to the case main body 57 so as to form a gear chamber 65 with the case main body 57, and the motion conversion mechanism 42 is housed in the gear chamber 65.
  • the motion conversion mechanism 42 includes a drive gear 67 provided on the motor shaft 64 of the electric motor 41, an intermediate large-diameter gear 68 that meshes with the drive gear 67, and an intermediate small-diameter gear that rotates together with the intermediate large-diameter gear 68. It has a 69, a driven gear 70 that meshes with the intermediate small-diameter gear 69, and a nut 71 that is integrally provided with the driven gear 70.
  • the intermediate large-diameter gear 68 and the intermediate small-diameter gear 69 are integrally formed, and are rotatably supported by a support shaft 72 parallel to the motor shaft 64 and the screw shaft 39. Both ends of the support shaft 72 are supported by the case main body 57 and the second cover member 59.
  • the nut 71 has a radius from a large-diameter cylindrical portion 71a rotatably housed in the second accommodating cylinder portion 56 and an end portion of the large-diameter cylindrical portion 71a opposite to the second cover member 59.
  • a small-diameter cylindrical portion 71c that extends inwardly extending in the direction and extends to the side opposite to the second cover member 59 and penetrates the screw shaft 39 so as to be connected to the inner peripheral edge of the inward flange 71b.
  • an outward flange portion 71d that projects outward in the radial direction from the end portion of the large-diameter cylindrical portion 71a on the side of the second cover member 59.
  • a female screw 73 screwed to the screw shaft 39 is engraved on the inner circumference of the small-diameter cylindrical portion 71c, and the driven gear 70 is formed on the outer circumference of the outward flange portion 71d.
  • a ball bearing 74 is interposed between the small-diameter cylindrical portion 71c and the end of the second accommodating cylinder portion 56 on the second end wall portion 56a side.
  • the nut 71 is formed so that the recess 75 defined by the large-diameter cylindrical portion 71a and the inward flange portion 71b of the nut 71 opens toward the protrusion 39a side.
  • the recess 75 accommodates a plurality of the disc springs 76 and a disk-shaped retainer 77 that sandwiches the disc springs 76 between the inward flange 71b of the nut 71.
  • the second cover member 59 of the actuator case 40 is integrally formed with a bottomed cylindrical guide cylinder portion 59a surrounding the screw shaft 39, and the inner surface of the guide cylinder portion 59a is described as described above.
  • a pair of locking grooves 78 that extend along the axis of the screw shaft 39 and engage the protrusion 39a in a slidable manner are formed.
  • a bearing member 79 that receives a thrust load from the nut 71 is interposed between the open end of the guide cylinder portion 59a and the nut 71, and the bearing member 79 is short that is inserted into the recess 75. It has a cylindrical portion 79a integrally.
  • the screw shaft 39 has its protrusion 39a due to the forward rotation operation of the electric motor 41. Moves in a direction away from the retainer 77, but the outer peripheral portion of the retainer 77 comes into contact with the short cylindrical portion 79a of the bearing member 79 to prevent the disc spring 76 from detaching from the recess 75. NS. Further, when the electric motor 41 is reversely operated so as to loosen the brake cable 37, the screw shaft 39 moves in a direction in which the protrusion 39a approaches the retainer 77, but the brake cable 37 is on the non-operating position side.
  • the electric motor 41 Since the spring is urged toward, the electric motor 41 is in a no-load state until the protrusion 39a abuts on the retainer 77, and after the protrusion 39a abuts on the retainer 77, the protrusion 39a.
  • the elastic force of the disc spring 76 acts on the portion 39a via the retainer 77, and a load is applied to the electric motor 41.
  • the electric power of the power supply 81 is supplied to the electric motor 41 in the electric actuator 38 via the drive circuit 82, and the operation of the electric motor 41, that is, the operation of the drive circuit 82 is a control unit. It is controlled by C.
  • the control unit C is provided with an instruction means 83 for detecting that the vehicle user has performed an operation for releasing the parking brake state and outputting a signal for releasing the parking brake state, and the electric motor 41.
  • the current detecting means 84 for detecting the energizing current and the notifying means 85 for notifying that an abnormality has occurred in the electric parking brake device including the electric actuator 38 are connected.
  • the control unit C starts the reverse operation of the electric motor 41 for a set time T (see FIG. 5) in which an inrush current is assumed to occur. After that, the inclination of the current value based on the current value detected by the current detecting means 84 is used to determine whether the reverse operation of the electric motor 41 is stopped, and the inclination of the current value is a predetermined value ⁇ 0 (see FIG. 5). ) The reverse operation of the electric motor 41 is stopped according to the above.
  • the slope of the current value is a value obtained by (the current current value detected by the current detecting means 84)-(for example, the previous current value detected by the current detecting means 84 40 ms ago) at a predetermined time. Obtained by removing.
  • the inrush current is generated immediately after the start of the reverse operation of the electric motor 41, so that the current becomes unstable temporarily. From time t1 elapsed from the start of the reverse operation of the electric motor 41, the determination of stopping the reverse operation of the electric motor 41 is started based on the inclination of the current value based on the current value detected by the current detecting means 84.
  • the electric motor 41 After the inrush current is generated, the electric motor 41 becomes a no-load state, so that the energizing current to the electric motor 41 becomes a stable state in a normal state, and the electric motor 41 starts from the time t2 when the stable state ends.
  • the current value detected by the current detecting means 84 increases, and as shown in FIG. 5B, the gradient of the current value also increases accordingly. Then, the reverse operation of the electric motor 41 is stopped at the time t3 when the slope of the current value becomes the predetermined value ⁇ 0 or more.
  • the state of the braking gap automatic adjusting means 18 at the time of the previous parking brake, or the parking brake state is released while the electric actuator 38 is operating to enter the parking brake state, and the reverse operation of the electric motor 41 is started.
  • the electric motor 41 is in a no-load state and should be within the current stable period under a normal state, that is, the electric motor 41 is engaged between the time t1 and the time t2 in FIG. 5 (a). It is conceivable that a state in which the load increases may occur, but since the control unit C starts the reverse operation stop determination of the electric motor 41 based on the inclination of the current value at the time t1, such a case can be dealt with. Is.
  • control unit C cannot determine the operation stop due to the inclination of the current value, for example, when it is in an extremely low voltage state, when it is restored after an abnormality occurs, or when another failure occurs.
  • the current value detected by the current detecting means 84 reaches the reference value, the reverse operation of the electric motor 41 is stopped.
  • control unit C determines that the electric motor 41 is abnormal in response to the inclination of the current value becoming greater than or equal to the second predetermined value larger than the predetermined value ⁇ 0, and the notification means to that effect. Notify at 85.
  • the current is generated after the set time T, which is assumed to generate an inrush current during the reverse operation of the electric motor 41, elapses from the start of the reverse operation of the electric motor 41.
  • the reverse operation stop of the electric motor 41 is determined by the inclination of the current value based on the current value detected by the detection means 84, and the reverse operation of the electric motor 41 is performed according to the inclination of the current value of ⁇ 0 or more. Therefore, basically, even if a load is applied to the electric motor 41 within a period in which the electric motor 41 should be in a no-load state, the reverse operation of the electric motor 41 can be stopped promptly.
  • control unit C stops the reverse operation of the electric motor 41 when the current value detected by the current detecting means 84 reaches the reference value when it is impossible to determine the operation stop due to the inclination of the current value. Therefore, in the case of an extremely low voltage state, a recovery operation after an abnormality occurs, or another failure, the reverse operation of the electric motor 41 can be stopped by the current value.
  • control unit C determines that the electric motor 41 is abnormal when the slope of the current value becomes greater than or equal to the second predetermined value larger than the predetermined value ⁇ 0, so that the slope of the current value becomes higher.
  • the value becomes a second predetermined value or more, which is larger than the predetermined value ⁇ that is the criterion for determining the reverse operation stop of the electric motor 41 the reverse operation of the electric motor 41 can be stopped and it can be determined that the state is abnormal.

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

Abstract

Provided is an electric parking brake device comprising: an electric actuator capable of, during reverse rotation of a forwardly/reversely rotatable electric motor, applying a load to the electric motor; a current detecting means that detects an energizing current to the electric motor; and a control unit that controls operation of the electric motor in such a way that reverse operation of the electric motor is stopped when the slope of the current value is greater than or equal to a predetermined value during reverse operation of the electric motor. Since the start of the reverse operation of the electric motor (41), after a lapse of a set period of time in which an inrush current is expected to occur during reverse operation of the electric motor (41), the control unit (C) stops reverse operation of the electric motor (41) on the basis of the slope of a current value based on the current value detected by the current detecting means (84). Thus, the operation of the electric motor can be stopped promptly even when a load is applied to the electric motor during a period in which the electric motor should be basically at no load upon release of a parking brake state.

Description

電動パーキングブレーキ装置Electric parking brake device
　本発明は、パーキングブレーキ状態を得る作動位置ならびにパーキングブレーキ状態を解除する非作動位置間での回動を可能とするとともに前記非作動位置側に向けて弾発付勢されるパーキングブレーキレバーと、当該パーキングブレーキレバーを前記非作動位置から前記作動位置に動かす動力を発揮する正転状態ならびに前記パーキングブレーキレバーを前記作動位置から前記非作動位置側に戻す際の逆転状態を切替え可能とした電動モータを有して前記パーキングブレーキレバーに連結されるとともに前記電動モータの逆転時に前記電動モータに負荷を与えることを可能とした電動アクチュエータと、前記電動モータへの通電電流を検出する電流検出手段と、前記電動モータの逆転作動時に前記電流検出手段で検出した電流値の傾きが所定値以上となるのに応じて前記電動モータの逆転作動を停止するようにして前記電動モータの作動を制御する制御ユニットとを備える電動パーキングブレーキ装置に関する。 The present invention provides a parking brake lever that enables rotation between an operating position for obtaining a parking brake state and a non-operating position for releasing the parking brake state, and is elastically urged toward the non-operating position side. An electric motor capable of switching between a normal rotation state that exerts power to move the parking brake lever from the non-operating position to the operating position and a reversing state when the parking brake lever is returned from the operating position to the non-operating position side. An electric actuator that is connected to the parking brake lever and is capable of applying a load to the electric motor when the electric motor is reversed, and a current detecting means that detects an energizing current to the electric motor. Control to control the operation of the electric motor by stopping the reverse operation of the electric motor in response to the inclination of the current value detected by the current detecting means becoming equal to or higher than a predetermined value during the reverse operation of the electric motor. The present invention relates to an electric parking brake device including a unit.
　電動アクチュエータの作動によってパーキングブレーキレバーを作動位置に動かしてパーキングブレーキ状態を得るとともに、パーキングブレーキレバーを非作動位置に動かすように電動アクチュエータが作動するのに応じてパーキングブレーキ力を解放するようにした車両用電動パーキングブレーキ装置が、特許文献１で知られている。 The parking brake lever is moved to the operating position by the operation of the electric actuator to obtain the parking brake state, and the parking braking force is released according to the operation of the electric actuator so as to move the parking brake lever to the non-operating position. An electric parking brake device for a vehicle is known in Patent Document 1.
日本特許第６１７６４５６号公報Japanese Patent No. 6176456
　ところで、車両用電動パーキングブレーキ装置においてパーキングブレーキ解除時には、電動アクチュエータの電動モータにかかる負荷が小さくなって無負荷電流が流れることになり、電動アクチュエータを構成する複数の部材で戻し過ぎが生じてロック状態に陥る可能性がある。このため上記特許文献１で開示されたものでは、電動モータの逆転作動時に電動アクチュエータの一部を構成する直動部材にばねによる負荷を与えるとともに、前記電動モータの逆転作動時に突入電流が生じた後で電流安定期に入ってから所定時間が経過するまでは電動アクチュエータ側で異常が生じているか否かを確認し、その後で、電動モータへの通電電流の増大側の傾きを検出し、その傾きが予め設定した所定値以上となるのに応じて電動モータの逆転作動を停止するようにしている。 By the way, in the electric parking brake device for vehicles, when the parking brake is released, the load applied to the electric motor of the electric actuator becomes small and a no-load current flows, and the plurality of members constituting the electric actuator are excessively returned and locked. You may fall into a state. Therefore, in the one disclosed in Patent Document 1, a load is applied by a spring to a linear motion member forming a part of the electric actuator when the electric motor is reversely operated, and an inrush current is generated when the electric motor is reversely operated. Later, after entering the current stabilization period until a predetermined time elapses, it is confirmed whether or not an abnormality has occurred on the electric actuator side, and then the inclination of the energizing current to the electric motor on the increasing side is detected, and the inclination is detected. The reverse operation of the electric motor is stopped when the inclination becomes equal to or higher than a preset predetermined value.
　ところが、たとえば一対のブレーキシューおよびブレーキドラム間の間隙を自動的に調整する制動間隙自動調整手段の前回のパーキングブレーキ時の状態や、電動アクチュエータがパーキングブレーキ状態に入るように作動している途中でパーキングブレーキ状態を解除して電動モータの逆転作動を開始したとき等には、通常の状態では電動モータが無負荷状態であって電流安定期間内であるべきときに、電動モータにかかる負荷が増大する状態が考えられ、そのような場合に、上記特許文献１で開示されたものでは、電動モータの停止タイミングが遅れてしまうことになる。 However, for example, the state of the braking gap automatic adjusting means that automatically adjusts the gap between the pair of brake shoes and the brake drum at the time of the previous parking brake, or while the electric actuator is operating to enter the parking brake state. When the parking brake state is released and the reverse operation of the electric motor is started, the load applied to the electric motor increases when the electric motor is in a no-load state under normal conditions and should be within the current stable period. In such a case, in the case disclosed in Patent Document 1, the stop timing of the electric motor is delayed.
　本発明は、かかる事情に鑑みてなされたものであり、パーキングブレーキ状態の解除時に基本的には電動モータが無負荷状態であるべき期間内に電動モータに負荷がかかるようになっても速やかに電動モータの作動を停止し得るようにした電動パーキングブレーキ装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and even if a load is applied to the electric motor within a period in which the electric motor should basically be in a no-load state when the parking brake state is released, the present invention is promptly made. It is an object of the present invention to provide an electric parking brake device capable of stopping the operation of an electric motor.
　上記目的を達成するために、本発明は、パーキングブレーキ状態を得る作動位置ならびにパーキングブレーキ状態を解除する非作動位置間での回動を可能とするとともに前記非作動位置側に向けて弾発付勢されるパーキングブレーキレバーと、当該パーキングブレーキレバーを前記非作動位置から前記作動位置に動かす動力を発揮する正転状態ならびに前記パーキングブレーキレバーを前記作動位置から前記非作動位置側に戻す際の逆転状態を切替え可能とした電動モータを有して前記パーキングブレーキレバーに連結されるとともに前記電動モータの逆転時に前記電動モータに負荷を与えることを可能とした電動アクチュエータと、前記電動モータへの通電電流を検出する電流検出手段と、前記電動モータの逆転作動時に前記電流検出手段で検出した電流値の傾きが所定値以上となるのに応じて前記電動モータの逆転作動を停止するようにして前記電動モータの作動を制御する制御ユニットとを備える電動パーキングブレーキ装置において、前記制御ユニットは、前記電動モータの逆転作動時に突入電流が生じると想定される設定時間が前記電動モータの逆転作動開始から経過した後に、前記電流検出手段で検出した電流値に基づく電流値の傾きで前記電動モータの逆転作動停止を判断することを第１の特徴とする。 In order to achieve the above object, the present invention enables rotation between the operating position for obtaining the parking brake state and the non-operating position for releasing the parking brake state, and is repelled toward the non-operating position side. The parking brake lever that is forced, the normal rotation state that exerts the power to move the parking brake lever from the non-operating position to the operating position, and the reverse rotation when the parking brake lever is returned from the operating position to the non-operating position side. An electric actuator having an electric motor whose state can be switched and being connected to the parking brake lever and capable of applying a load to the electric motor when the electric motor is reversed, and energization of the electric motor. The current detecting means for detecting the current and the reversing operation of the electric motor are stopped according to the inclination of the current value detected by the current detecting means when the reversing operation of the electric motor becomes a predetermined value or more. In an electric parking brake device including a control unit that controls the operation of the electric motor, the control unit has a set time in which a rush current is assumed to be generated during the reverse operation of the electric motor elapses from the start of the reverse operation of the electric motor. After that, the first feature is that the reverse operation stop of the electric motor is determined by the inclination of the current value based on the current value detected by the current detecting means.
　また本発明は、第１の特徴の構成に加えて、前記制御ユニットは、前記電流値の傾きによる作動停止判断が不能であるときには、前記電流検出手段で検出した電流値が基準値に達したときに、前記電動モータの逆転作動を停止することを第２の特徴とする。 Further, in the present invention, in addition to the configuration of the first feature, when the control unit cannot determine the operation stop due to the inclination of the current value, the current value detected by the current detecting means reaches the reference value. The second feature is that the reverse operation of the electric motor is sometimes stopped.
　さらに本発明は、第１または第２の特徴の構成に加えて、前記制御ユニットは、前記電流値の傾きが前記所定値よりも大きな第２の所定値以上となるのに応じて前記電動モータが異常であると判断することを第３の特徴とする。 Further, in the present invention, in addition to the configuration of the first or second feature, the control unit has the electric motor according to the inclination of the current value to be greater than or equal to the second predetermined value larger than the predetermined value. The third feature is to determine that is abnormal.
　本発明の第１の特徴によれば、電動モータの逆転作動時に突入電流が生じた後に、基本的には安定した電流値が得られるはずの期間内で電流値の傾きが所定値以上となるのに応じて電動モータの逆転作動を停止することで、基本的には電動モータが無負荷状態であるべき期間内に電動モータに負荷がかかるようになっても速やかに電動モータの逆転作動を停止することができる。 According to the first feature of the present invention, after an inrush current is generated during the reverse operation of the electric motor, the slope of the current value becomes equal to or higher than a predetermined value within a period in which a stable current value should basically be obtained. By stopping the reversing operation of the electric motor in response to the above, basically, even if the electric motor becomes loaded within the period when the electric motor should be in the no-load state, the reversing operation of the electric motor can be promptly performed. Can be stopped.
　また本発明の第２の特徴によれば、電流値の傾きによる作動停止判断が不能であるときには電流値が基準値に達したときに電動モータの逆転作動を停止することで、極端な低電圧状態にある場合、異常が生じた後の復帰作動の場合、その他の故障が生じた場合には、電流値で電動モータの逆転作動を停止することができる。 Further, according to the second feature of the present invention, when it is impossible to determine the operation stop due to the inclination of the current value, the reverse operation of the electric motor is stopped when the current value reaches the reference value, so that the voltage is extremely low. In the case of a state, a return operation after an abnormality occurs, or another failure occurs, the reverse operation of the electric motor can be stopped by the current value.
　さらに本発明の第３の特徴によれば、電流値の傾きが電動モータの逆転作動停止の判断基準となる所定値よりも大きな第２の所定値以上となったときには、電動モータの逆転作動を停止するとともに異常状態であると判断することができる。 Further, according to the third feature of the present invention, when the slope of the current value becomes equal to or more than a second predetermined value larger than a predetermined value which is a criterion for determining the reverse operation stop of the electric motor, the reverse operation of the electric motor is performed. It can be determined that it is in an abnormal state as well as stopped.
図１はドラムブレーキの正面図である。（第１の実施の形態）FIG. 1 is a front view of the drum brake. (First Embodiment) 図２はドラムブレーキの背面図である。（第１の実施の形態）FIG. 2 is a rear view of the drum brake. (First Embodiment) 図３は電動アクチュエータの縦断面図である。（第１の実施の形態）FIG. 3 is a vertical cross-sectional view of the electric actuator. (First Embodiment) 図４は電動モータの逆転作動停止制御用の構成を示すブロック図である。（第１の実施の形態）FIG. 4 is a block diagram showing a configuration for reverse operation stop control of the electric motor. (First Embodiment) 図５は電動モータの逆転作動時の電流値（ａ）および電流値の傾き（ｂ）の変化の一例を示す図である。（第１の実施の形態）FIG. 5 is a diagram showing an example of changes in the current value (a) and the slope (b) of the current value during the reverse operation of the electric motor. (First Embodiment)
３４・・・パーキングブレーキレバー
３８・・・電動アクチュエータ
４１・・・電動モータ
Ｃ・・・制御ユニット 34 ... Parking brake lever 38 ... Electric actuator 41 ... Electric motor C ... Control unit
　本発明の実施の形態について、添付の図面を参照しながら説明する。 An embodiment of the present invention will be described with reference to the accompanying drawings.
第１の実施の形態First Embodiment
　先ず図１において、四輪車両の車輪たとえば左後輪にドラムブレーキＢが設けられており、このドラムブレーキＢは、前記左後輪の車軸１１を貫通させる貫通孔１２を中央部に有する固定のバックプレート１３と、前記左後輪とともに回転するブレーキドラム１４の内周に摺接することを可能として前記バックプレート１３内に配置される第１および第２のブレーキシュー１５，１６と、第１および第２のブレーキシュー１５，１６が拡張作動する力を発揮するようにして前記バックプレート１３に固定されるホイールシリンダ１７と、第１および第２のブレーキシュー１５，１６および前記ブレーキドラム１４間の間隙を自動的に調整する制動間隙自動調整手段（所謂オートアジャスタ）１８と、第１および第２のブレーキシュー１５，１６間に設けられるリターンスプリング１９とを備える。 First, in FIG. 1, a drum brake B is provided on a wheel of a four-wheeled vehicle, for example, the left rear wheel, and the drum brake B is fixed with a through hole 12 in the center for penetrating the axle 11 of the left rear wheel. The first and second brake shoes 15, 16 and the first and second brake shoes 15 and 16 arranged in the back plate 13 so as to be slidable with the back plate 13 and the inner circumference of the brake drum 14 rotating with the left rear wheel. Between the wheel cylinder 17 fixed to the back plate 13 so that the second brake shoes 15 and 16 exert an extended operating force, and between the first and second brake shoes 15 and 16 and the brake drum 14. A braking gap automatic adjusting means (so-called auto adjuster) 18 for automatically adjusting the gap and a return spring 19 provided between the first and second brake shoes 15 and 16 are provided.
　第１および第２のブレーキシュー１５，１６は、前記ブレーキドラム１４の内周に沿うようにして弓形の平板状に形成される第１および第２のウエブ１５ａ，１６ａと、それらの第１および第２のウエブ１５ａ，１６ａの外周に直交するように連設される第１および第２のリム１５ｂ，１６ｂと、第１および第２のリム１５ｂ，１６ｂの外周に貼着される第１および第２のライニング１５ｃ，１６ｃとから成る。 The first and second brake shoes 15 and 16 include the first and second webs 15a and 16a formed in a bow-shaped flat plate shape along the inner circumference of the brake drum 14, and their first and second brake shoes 15a and 16a. The first and second rims 15b and 16b are connected so as to be orthogonal to the outer periphery of the second webs 15a and 16a, and the first and second rims 15b and 16b attached to the outer periphery of the first and second rims 15b and 16b. It consists of a second lining 15c and 16c.
　前記バックプレート１３には、第１および第２のブレーキシュー１５，１６の拡張、収縮時の支点となるアンカープレート２１が、第１および第２のウエブ１５ａ，１６ａの一端部（この実施の形態では下端部）を回動可能に支持するようにして固設される。また前記ホイールシリンダ１７は、ブレーキペダルで操作されるマスタシリンダ（図示せず）の出力液圧によって作動して、前記アンカープレート２１を支点として第１および第２のブレーキシュー１５，１６を拡張する側に駆動する力を発揮するようにして、第１および第２のブレーキシュー１５，１６の他端部間で前記バックプレート１３に固定されており、このホイールシリンダ１７が備える一対のピストン２０の外端部は、第１および第２のウエブ１５ａ，１６ａの他端部（この実施の形態では上端部）に対向するように配置される。 On the back plate 13, an anchor plate 21 serving as a fulcrum during expansion and contraction of the first and second brake shoes 15 and 16 is provided at one end of the first and second webs 15a and 16a (this embodiment). Then, the lower end portion) is fixed so as to be rotatably supported. Further, the wheel cylinder 17 is operated by the output hydraulic pressure of a master cylinder (not shown) operated by a brake pedal to expand the first and second brake shoes 15 and 16 with the anchor plate 21 as a fulcrum. A pair of pistons 20 included in the wheel cylinder 17 are fixed to the back plate 13 between the other ends of the first and second brake shoes 15 and 16 so as to exert a driving force to the side. The outer end portion is arranged so as to face the other end portion (upper end portion in this embodiment) of the first and second webs 15a and 16a.
　第１および第２のウエブ１５ａ，１６ａの前記一端部間には、それらの第１および第２のウエブ１５ａ，１６ａの前記一端部を前記アンカープレート２１側に付勢するコイルスプリング２２が設けられ、第１および第２のウエブ１５ａ，１６ａの他端部間には、第１および第２のブレーキシュー１５，１６を収縮方向に付勢する一対の前記リターンスプリング１９が設けられる。 A coil spring 22 is provided between the one ends of the first and second webs 15a and 16a to urge the one ends of the first and second webs 15a and 16a toward the anchor plate 21. A pair of return springs 19 for urging the first and second brake shoes 15 and 16 in the contraction direction are provided between the other ends of the first and second webs 15a and 16a.
　前記制動間隙自動調整手段１８は、第１および第２のブレーキシュー１５，１６が有する第１および第２のウエブ１５ａ，１６ａ間に設けられるとともにアジャストギヤ２３の回動によって伸長し得る収縮位置規制ストラット２４と、前記アジャストギヤ２３に係合する送り爪２５ａを有して第１および第２のブレーキシュー１５，１６のうち第２のブレーキシュー１６の前記第２のウエブ１６ａに回動可能に支持されるアジャストレバー２５と、前記収縮位置規制ストラット２４を伸長させる方向に前記アジャストギヤ２３を回動させる側に前記アジャストレバー２５を回動付勢するアジャストスプリング２６とで構成される。 The braking gap automatic adjusting means 18 is provided between the first and second webs 15a and 16a of the first and second brake shoes 15 and 16, and is a contraction position regulating that can be extended by rotation of the adjusting gear 23. It has a strut 24 and a feed claw 25a that engages with the adjust gear 23, and can rotate to the second web 16a of the second brake shoe 16 of the first and second brake shoes 15 and 16. It is composed of an adjusting lever 25 that is supported and an adjusting spring 26 that rotates and urges the adjusting lever 25 to the side that rotates the adjusting gear 23 in a direction that extends the contraction position regulating strut 24.
　前記収縮位置規制ストラット２４は、第１および第２のブレーキシュー１５，１６の収縮位置を規制するものであり、第１および第２のブレーキシュー１５，１６のうち第１のブレーキシュー１５が備える前記第１のウエブ１５ａの前記他端部寄りに係合する第１係合連結部２７ａを有する第１ロッド２７と、第２のブレーキシュー１６が備える第２のウエブ１６ａの前記他端部寄りに係合する第２係合連結部２８ａを有して第１ロッド２７と同軸に配置される第２ロッド２８と、第１ロッド２７に一端部が軸方向相対移動可能に挿入されるとともに第２ロッド２８に他端部が同軸に螺合されるアジャストボルト２９とを有しており、前記アジャストギヤ２３は、第１および第２ロッド２７，２８間に配置されて前記アジャストボルト２９の外周に形成される。 The contraction position regulating strut 24 regulates the contraction positions of the first and second brake shoes 15 and 16, and the first brake shoe 15 of the first and second brake shoes 15 and 16 is provided. A first rod 27 having a first engaging connecting portion 27a that engages with the other end of the first web 15a and a second web 16a provided with the second brake shoe 16 near the other end. A second rod 28 having a second engaging connecting portion 28a that engages with the first rod 27 and arranged coaxially with the first rod 27, and one end of the first rod 27 being inserted into the first rod 27 so as to be relatively movable in the axial direction. The two rods 28 have an adjusting bolt 29 whose other end is coaxially screwed, and the adjusting gear 23 is arranged between the first and second rods 27 and 28 to provide an outer circumference of the adjusting bolt 29. Is formed in.
　第１のウエブ１５ａの前記他端部寄りの前記車軸１１側に臨む側縁には、第１係合連結部２７ａを係合させる第１係止凹部３０が設けられ、また第２のウエブ１６ａの前記他端部寄りの前記車軸１１側に臨む側縁には、第２係合連結部２８ａを係合させる第２係止凹部３１が設けられる。 A first locking recess 30 for engaging the first engaging connecting portion 27a is provided on the side edge of the first web 15a near the other end and facing the axle 11 side, and the second web 16a is provided. A second locking recess 31 for engaging the second engaging connecting portion 28a is provided on the side edge facing the axle 11 side near the other end of the above.
　前記アジャストギヤ２３に係合する送り爪２５ａを有するアジャストレバー２５は、前記第２のウエブ１６ａに支軸３２を介して回動可能に支持され、前記第２のウエブ１６ａおよび前記アジャストレバー２５間に前記アジャストスプリング２６が設けられる。しかも前記アジャストスプリング２６のばね力は、前記リターンスプリング１９のばね力よりも小さく設定される。 The adjusting lever 25 having a feed claw 25a that engages with the adjusting gear 23 is rotatably supported by the second web 16a via a support shaft 32, and is rotatably supported between the second web 16a and the adjusting lever 25. Is provided with the adjust spring 26. Moreover, the spring force of the adjust spring 26 is set to be smaller than the spring force of the return spring 19.
　このような制動間隙自動調整手段１８によれば、第１および第２のブレーキシュー１５，１６が前記ホイールシリンダ１７の作動によって拡張作動する際に前記第１および第２のライニング１５ｃ，１６ｃの摩耗に起因して一定値以上拡張した場合には、前記アジャストスプリング２６のばね力によって前記アジャストレバー２５が前記支軸３２の軸線まわりに回動し、それによって前記アジャストギヤ２３が回動するのに応じて前記収縮位置規制ストラット２４の有効長さが増加補正される。 According to the braking gap automatic adjusting means 18, the first and second linings 15c and 16c are worn when the first and second brake shoes 15 and 16 are extended by the operation of the wheel cylinder 17. When the adjustment lever 25 is expanded by a certain value or more due to the above, the adjust lever 25 is rotated around the axis of the support shaft 32 by the spring force of the adjust spring 26, whereby the adjust gear 23 is rotated. The effective length of the contraction position regulating strut 24 is increased and corrected accordingly.
　ところで、このドラムブレーキＢは、作動に応じてパーキングブレーキ力を発生させ得るパーキングブレーキレバー３４を備えており、このパーキングブレーキレバー３４は、第１のブレーキシュー１５における前記第１のウエブ１５ａの一部に、前記ブレーキドラム１４の回転軸線に沿う方向での正面視（図１で示す方向）で重なるように配置され、前記第１のウエブ１５ａの長手方向に沿って長く延びる。 By the way, the drum brake B includes a parking brake lever 34 capable of generating a parking brake force according to the operation, and the parking brake lever 34 is one of the first webs 15a of the first brake shoe 15. The brake drum 14 is arranged so as to overlap with each other in a front view (direction shown in FIG. 1) in a direction along the rotation axis of the brake drum 14, and extends long along the longitudinal direction of the first web 15a.
　前記パーキングブレーキレバー３４の一端部（この実施の形態では下端部）には、ブレーキケーブル３７の一端部に固定された係合駒３６が係合され、前記パーキングブレーキレバー３４の他端部（この実施の形態では上端部）は、第１のブレーキシュー１５における前記第１のウエブ１５ａの他端部にピン３５を介して連結される。 An engaging piece 36 fixed to one end of the brake cable 37 is engaged with one end of the parking brake lever 34 (the lower end in this embodiment), and the other end of the parking brake lever 34 (this). In the embodiment, the upper end portion) is connected to the other end portion of the first web 15a in the first brake shoe 15 via a pin 35.
　車両のパーキングブレーキ作動時には、前記ブレーキケーブル３７から入力される牽引力により、前記パーキングブレーキレバー３４が前記ピン３５を支点として図１の反時計方向に回動、駆動されるものであり、このパーキングブレーキレバー３４の回動によって、第２のブレーキシュー１６に、当該ブレーキシュー１６が有する前記第２のライニング１６ｃを前記ブレーキドラム１４の内周に圧接させる方向の力が前記収縮位置規制ストラット２４を介して作用する。さらに前記パーキングブレーキレバー３４が図１の反時計方向に続けて回動、駆動されると、前記パーキングブレーキレバー３４が前記収縮位置規制ストラット２４の第１係合連結部２７ａとの係合部を支点として回動し、今度は、前記ピン３５を介して第１のブレーキシュー１５が拡張作動し、第１のブレーキシュー１５の前記第１のライニング１５ｃが前記ブレーキドラム１４の内周に圧接することになる。すなわち前記パーキングブレーキレバー３４は、第１および第２のブレーキシュー１５，１６の前記第１および第２のライニング１５ｃ，１６ｃが前記ブレーキドラム１４の内周に圧接するようにした作動位置に作動し、この状態でパーキングブレーキ状態が得られることになる。 When the parking brake of the vehicle is activated, the parking brake lever 34 is rotated and driven in the counterclockwise direction of FIG. 1 with the pin 35 as a fulcrum by the traction force input from the brake cable 37. Due to the rotation of the lever 34, a force in a direction in which the second lining 16c of the brake shoe 16 is pressed against the inner circumference of the brake drum 14 is applied to the second brake shoe 16 via the contraction position regulating strut 24. To work. Further, when the parking brake lever 34 is continuously rotated and driven in the counterclockwise direction of FIG. 1, the parking brake lever 34 engages with the first engaging connecting portion 27a of the contraction position regulating strut 24. It rotates as a fulcrum, and this time, the first brake shoe 15 expands and operates via the pin 35, and the first lining 15c of the first brake shoe 15 presses against the inner circumference of the brake drum 14. It will be. That is, the parking brake lever 34 operates at an operating position where the first and second linings 15c and 16c of the first and second brake shoes 15 and 16 are in pressure contact with the inner circumference of the brake drum 14. , The parking brake state can be obtained in this state.
　また前記ブレーキケーブル３７を緩めることで前記パーキングブレーキレバー３４に対する回動駆動力の付与を停止したときには、前記ブレーキドラム１４の内周から離反する方向に前記リターンスプリング１９のばね力によって作動する第１および第２のブレーキシュー１５，１６とともに前記パーキングブレーキレバー３４は非作動位置に戻ることになり、前記パーキングブレーキレバー３４は非作動位置側に向けて付勢されている。 Further, when the application of the rotational driving force to the parking brake lever 34 is stopped by loosening the brake cable 37, the first operation is performed by the spring force of the return spring 19 in a direction away from the inner circumference of the brake drum 14. The parking brake lever 34 returns to the non-operating position together with the second brake shoes 15 and 16, and the parking brake lever 34 is urged toward the non-operating position side.
　図２を併せて参照して、前記ブレーキケーブル３７は、電動アクチュエータ３８が発揮する動力で牽引されるものであり、この電動アクチュエータ３８は、前記ブレーキケーブル３７に連結されるねじ軸３９と、当該ねじ軸３９をその回転を阻止しつつ軸線方向の往復運動を可能として支持するアクチュエータケース４０と、正逆回転を自在として前記アクチュエータケース４０に収容、支持される電動モータ４１と、その電動モータ４１で発生する回転運動を前記ねじ軸３９の直線運動に変換することを可能としつつ前記電動モータ４１および前記ねじ軸３９間に介設されて前記アクチュエータケース４０に収容される運動変換機構４２（図３参照）とを備える。 With reference to FIG. 2, the brake cable 37 is towed by the power exerted by the electric actuator 38, and the electric actuator 38 has a screw shaft 39 connected to the brake cable 37 and the screw shaft 39. An actuator case 40 that supports the screw shaft 39 so as to be able to reciprocate in the axial direction while blocking its rotation, an electric motor 41 that is housed and supported in the actuator case 40 with free forward and reverse rotation, and an electric motor 41 thereof. A motion conversion mechanism 42 (FIG. 6), which is interposed between the electric motor 41 and the screw shaft 39 and is housed in the actuator case 40, while making it possible to convert the rotary motion generated in the screw shaft 39 into a linear motion of the screw shaft 39. 3) and.
　この電動アクチュエータ３８の前記アクチュエータケース４０は、前記ホイールシリンダ１７とは反対側で前記バックプレート１３に取付け部材４３を介して取付けられる。前記取付け部材４３は、前記アクチュエータケース４０に固着されており、この取付け部材４３が複数個たとえば３個のボルト４４で前記バックプレート１３に締結される。 The actuator case 40 of the electric actuator 38 is attached to the back plate 13 on the opposite side of the wheel cylinder 17 via the attachment member 43. The mounting member 43 is fixed to the actuator case 40, and the mounting member 43 is fastened to the back plate 13 with a plurality of, for example, three bolts 44.
　また前記ブレーキケーブル３７のうち少なくとも前記バックプレート１３の外部に配索される部分は筒状部材で覆われており、この実施の形態では、たとえば鉄製の線材をコイル状に巻回して成る状部材であるアウターケーブル４５で前記ブレーキケーブル３７のうち少なくとも前記バックプレート１３の外部に配索される部分が覆われる。また前記筒状部材は、前記電動アクチュエータ３８の出力による反力を受けられる部材であればよく、前記アウターケーブル４５に代えて、金属製の筒状部材を用いるようにしてもよい。 Further, at least a portion of the brake cable 37 that is arranged outside the back plate 13 is covered with a tubular member, and in this embodiment, for example, a member formed by winding an iron wire rod into a coil shape. The outer cable 45 covers at least a portion of the brake cable 37 that is arranged outside the back plate 13. Further, the tubular member may be a member that can receive a reaction force due to the output of the electric actuator 38, and a metal tubular member may be used instead of the outer cable 45.
　図３を併せて参照して、前記電動アクチュエータ３８の前記ねじ軸３９は、ケーブルジョイント５１を介して前記ブレーキケーブル３７に連結される。そのねじ軸３９および前記ブレーキケーブル３７の連結部は、前記アクチュエータケース４０に結合される保護筒５０で覆われており、前記アウターケーブル４５の前記電動アクチュエータ３８側の端部は、ガイドチューブ５２を介して前記保護筒５０に取付けられる。 With reference to FIG. 3, the screw shaft 39 of the electric actuator 38 is connected to the brake cable 37 via a cable joint 51. The connecting portion of the screw shaft 39 and the brake cable 37 is covered with a protective cylinder 50 coupled to the actuator case 40, and the end of the outer cable 45 on the electric actuator 38 side has a guide tube 52. It is attached to the protective cylinder 50 via.
　前記バックプレート１３の下部の車両前後方向に沿う前部には筒部１３ａが一体に突設されており、前記アウターケーブル４５で覆われた前記ブレーキケーブル３７は、前記筒部１３ａから前記バックプレート１３内に導入され、前記アウターケーブル４５の前記筒部１３ａ側の端部がガイドチューブ５３で当該筒部１３ａに取付けられる。 A tubular portion 13a is integrally projected from the lower portion of the back plate 13 along the vehicle front-rear direction, and the brake cable 37 covered with the outer cable 45 is formed from the tubular portion 13a to the back plate. The outer cable 45 is introduced into the cylinder portion 13, and the end portion of the outer cable 45 on the tubular portion 13a side is attached to the tubular portion 13a by a guide tube 53.
　また前記第１および第２のウエブ１５ａ，１６ａの一端部間で、前記アンカープレート２１を前記バックプレート１３との間に挟む押さえ板４６が、前記アンカープレート２１とともに一対のリベット４７によって前記バックプレート１３の下部に取付けられ、前記押さえ板４６に、前記アウターケーブル４５とともに前記ブレーキケーブル３７をガイドするガイド部４６ａが、略Ｕ字状の横断面形状を有するようにして一体に設けられる。 Further, between one ends of the first and second webs 15a and 16a, a holding plate 46 sandwiching the anchor plate 21 with the back plate 13 is formed by a pair of rivets 47 together with the anchor plate 21 to form the back plate. A guide portion 46a, which is attached to the lower part of the 13 and guides the brake cable 37 together with the outer cable 45, is integrally provided on the holding plate 46 so as to have a substantially U-shaped cross-sectional shape.
　前記アクチュエータケース４０は、第１および第２の収容筒部５５，５６を一体に有するケース主体５７と、第１の収容筒部５５の開口端に結合される第１のカバー部材５８と、第１のカバー部材５８と反対側から前記ケース主体５７に結合される第２のカバー部材５９とで構成される。 The actuator case 40 includes a case main body 57 integrally having first and second accommodating cylinders 55 and 56, a first cover member 58 coupled to an open end of the first accommodating cylinder 55, and a first cover member 58. It is composed of a cover member 58 of 1 and a second cover member 59 coupled to the case main body 57 from the opposite side.
　前記第１の収容筒部５５は、一端部に第１の端壁部５５ａが設けられるようにして有底円筒状に形成され、前記第１の端壁部５５ａの中央部には、嵌合孔６０が同軸に形成される。第２の収容筒部５６は、前記第１の収容筒部５５の側方に配置され、一端部を開放するとともに前記第１の収容筒部５５の長手方向中間部に配置される第２の端壁部５６ａで他端部が閉じられるようにして有底円筒状に形成され、第２の端壁部５６ａの中央部には、前記ねじ軸３９を囲繞する円筒状の筒部５６ｂが一体に突設される。また前記筒部５６ｂからの前記ねじ軸３９の突出端部および前記筒部５６ｂ間にはブーツ８０が設けられる。 The first accommodating cylinder portion 55 is formed in a bottomed cylindrical shape so that a first end wall portion 55a is provided at one end thereof, and is fitted to a central portion of the first end wall portion 55a. The holes 60 are formed coaxially. The second accommodating cylinder portion 56 is arranged on the side of the first accommodating cylinder portion 55, has one end opened, and is arranged in the intermediate portion in the longitudinal direction of the first accommodating cylinder portion 55. It is formed in a bottomed cylindrical shape so that the other end is closed by the end wall portion 56a, and a cylindrical tubular portion 56b surrounding the screw shaft 39 is integrated with the central portion of the second end wall portion 56a. It is thrust into. Further, a boot 80 is provided between the protruding end of the screw shaft 39 from the tubular portion 56b and the tubular portion 56b.
　前記電動モータ４１のモータケース６３の軸方向一端部には、モータ軸６４を回転自在に支持する円筒状の第１軸受部６３ａが突設され、前記モータ軸６４の一端部は前記第１軸受部６３ａを貫通して前記モータケース６３の一端部から突出され、前記モータケース６３の軸方向他端部には前記モータ軸６４の他端部を回転自在に支持する有底円筒状の第２軸受部６３ｂが突設される。 A cylindrical first bearing portion 63a that rotatably supports the motor shaft 64 is projected from one end portion of the motor case 63 of the electric motor 41 in the axial direction, and one end portion of the motor shaft 64 is the first bearing. A bottomed cylindrical second portion that penetrates the portion 63a and protrudes from one end of the motor case 63, and rotatably supports the other end of the motor shaft 64 at the other end in the axial direction of the motor case 63. The bearing portion 63b is projected.
　この電動モータ４１は、前記第１軸受部６３ａを前記ケース主体５７の前記嵌合孔６０に嵌合するようにしつつ前記モータケース６３の一端部を前記第１の端壁部５５ａに当接させるようにして第１の収容筒部５５に収容されるものであり、前記第２軸受部６３ｂが設けられる側の前記モータケース６３の他端部を外部に臨ませるようにして、前記電動モータ４１が第１の収容筒部５５に収容される。 In the electric motor 41, one end of the motor case 63 is brought into contact with the first end wall portion 55a while fitting the first bearing portion 63a into the fitting hole 60 of the case main body 57. The electric motor 41 is accommodated in the first accommodating cylinder portion 55 in this way so that the other end of the motor case 63 on the side where the second bearing portion 63b is provided faces the outside. Is housed in the first storage tube portion 55.
　前記第１のカバー部材５８は、前記第１の収容筒部５５に収容される前記電動モータ４１のうち第１の収容筒部５５から外部に臨む部分を覆って第１の収容筒部５５の開口端に結合される蓋部５８ａと、当該蓋部５８ａから側方に張り出すとともに前記第１の収容筒部５５の側方に配置されるコネクタ部５８ｂ（図２参照）とを一体に有し、前記電動モータ４１の前記第２軸受部６３ｂおよび前記蓋部５８ａ間にはウエーブワッシャ６６が介設される。第２のカバー部材５９は、前記ケース主体５７との間にギヤ室６５を形成するようにして前記ケース主体５７に結合され、このギヤ室６５に前記運動変換機構４２が収容される。 The first cover member 58 covers the portion of the electric motor 41 housed in the first storage cylinder portion 55 that faces the outside from the first storage cylinder portion 55, and the first storage cylinder portion 55. A lid portion 58a coupled to the opening end and a connector portion 58b (see FIG. 2) that projects laterally from the lid portion 58a and is arranged laterally of the first storage cylinder portion 55 are integrally provided. A wave washer 66 is interposed between the second bearing portion 63b and the lid portion 58a of the electric motor 41. The second cover member 59 is coupled to the case main body 57 so as to form a gear chamber 65 with the case main body 57, and the motion conversion mechanism 42 is housed in the gear chamber 65.
　前記運動変換機構４２は、前記電動モータ４１の前記モータ軸６４に設けられる駆動ギヤ６７と、その駆動ギヤ６７に噛合する中間大径ギヤ６８と、その中間大径ギヤ６８とともに回転する中間小径ギヤ６９と、当該中間小径ギヤ６９に噛合する被動ギヤ７０と、当該被動ギヤ７０に一体に設けられるナット７１とを有する。 The motion conversion mechanism 42 includes a drive gear 67 provided on the motor shaft 64 of the electric motor 41, an intermediate large-diameter gear 68 that meshes with the drive gear 67, and an intermediate small-diameter gear that rotates together with the intermediate large-diameter gear 68. It has a 69, a driven gear 70 that meshes with the intermediate small-diameter gear 69, and a nut 71 that is integrally provided with the driven gear 70.
　前記中間大径ギヤ６８および前記中間小径ギヤ６９は一体に形成されており、前記モータ軸６４および前記ねじ軸３９と平行な支軸７２で回転自在に支持される。また前記支軸７２の両端部は、前記ケース主体５７および前記第２のカバー部材５９で支持される。 The intermediate large-diameter gear 68 and the intermediate small-diameter gear 69 are integrally formed, and are rotatably supported by a support shaft 72 parallel to the motor shaft 64 and the screw shaft 39. Both ends of the support shaft 72 are supported by the case main body 57 and the second cover member 59.
　前記ナット７１は、前記第２の収容筒部５６内に回転自在に収容される大径円筒部７１ａと、大径円筒部７１ａの前記第２のカバー部材５９とは反対側の端部から半径方向内方に張り出す内向き鍔部７１ｂと、この内向き鍔部７１ｂの内周縁に連なって前記第２のカバー部材５９とは反対側に延びるとともに前記ねじ軸３９を貫通させる小径円筒部７１ｃと、前記大径円筒部７１ａの前記第２のカバー部材５９側の端部から半径方向外方に張り出す外向き鍔部７１ｄとを一体に有するように形成される。前記小径円筒部７１ｃの内周に前記ねじ軸３９に螺合する雌ねじ７３が刻設され、前記外向き鍔部７１ｄの外周に前記被動ギヤ７０が形成される。また前記小径円筒部７１ｃと、前記第２の収容筒部５６の前記第２の端壁部５６ａ側の端部との間にはボールベアリング７４が介装される。 The nut 71 has a radius from a large-diameter cylindrical portion 71a rotatably housed in the second accommodating cylinder portion 56 and an end portion of the large-diameter cylindrical portion 71a opposite to the second cover member 59. A small-diameter cylindrical portion 71c that extends inwardly extending in the direction and extends to the side opposite to the second cover member 59 and penetrates the screw shaft 39 so as to be connected to the inner peripheral edge of the inward flange 71b. And an outward flange portion 71d that projects outward in the radial direction from the end portion of the large-diameter cylindrical portion 71a on the side of the second cover member 59. A female screw 73 screwed to the screw shaft 39 is engraved on the inner circumference of the small-diameter cylindrical portion 71c, and the driven gear 70 is formed on the outer circumference of the outward flange portion 71d. A ball bearing 74 is interposed between the small-diameter cylindrical portion 71c and the end of the second accommodating cylinder portion 56 on the second end wall portion 56a side.
　前記ブレーキケーブル３７とは反対側で前記ねじ軸３９の端部には、当該ねじ軸３９の一直径線に沿う両側に向かって突出する突部３９ａが設けられる。一方、前記ナット７１には、当該ナット７１の前記大径円筒部７１ａおよび前記内向き鍔部７１ｂで規定される凹部７５が、前記突部３９ａ側に向かって開放するようにして形成される。 At the end of the screw shaft 39 on the side opposite to the brake cable 37, protrusions 39a protruding toward both sides along one diameter line of the screw shaft 39 are provided. On the other hand, the nut 71 is formed so that the recess 75 defined by the large-diameter cylindrical portion 71a and the inward flange portion 71b of the nut 71 opens toward the protrusion 39a side.
　ところで前記ねじ軸３９は、前記パーキングブレーキレバー３４を作動位置側に駆動すべく前記ブレーキケーブル３７を牽引する際には前記突部３９ａが前記ナット７１から離反する側に移動し、前記パーキングブレーキレバー３４を前記作動位置から前記非作動位置側に戻すべく前記ブレーキケーブル３７を緩める際には前記突部３９ａが前記ナット７１に近接する側に移動するものであり、前記ブレーキケーブル３７を緩める方向に前記ねじ軸３９が移動する際に前記突部３９ａおよび前記ナット７１間に介在して前記突部３９ａを前記ナット７１から離反させる側に付勢する弾発力を発揮する複数個の皿ばね７６が、前記凹部７５に収容される。 By the way, when the brake cable 37 is pulled to drive the parking brake lever 34 toward the operating position, the screw shaft 39 moves to the side where the protrusion 39a separates from the nut 71, and the parking brake lever When the brake cable 37 is loosened in order to return the 34 from the operating position to the non-operating position side, the protrusion 39a moves to the side closer to the nut 71, and the brake cable 37 is loosened. When the screw shaft 39 moves, a plurality of countersunk springs 76 that are interposed between the protrusion 39a and the nut 71 and exert an elastic force to urge the protrusion 39a to separate from the nut 71. Is housed in the recess 75.
　前記凹部７５には、複数個の前記皿ばね７６と、それらの皿ばね７６を前記ナット７１の前記内向き鍔部７１ｂとの間に挟む円板状のリテーナ７７とが収容される。 The recess 75 accommodates a plurality of the disc springs 76 and a disk-shaped retainer 77 that sandwiches the disc springs 76 between the inward flange 71b of the nut 71.
　前記アクチュエータケース４０の前記第２のカバー部材５９には、前記ねじ軸３９を囲繞する有底円筒状のガイド筒部５９ａが一体に形成されており、このガイド筒部５９ａの内面には、前記ねじ軸３９の軸線に沿う方向に延びて前記突部３９ａをスライド可能に係合させる一対の係止溝７８が形成される。 The second cover member 59 of the actuator case 40 is integrally formed with a bottomed cylindrical guide cylinder portion 59a surrounding the screw shaft 39, and the inner surface of the guide cylinder portion 59a is described as described above. A pair of locking grooves 78 that extend along the axis of the screw shaft 39 and engage the protrusion 39a in a slidable manner are formed.
　前記ガイド筒部５９ａの開口端部および前記ナット７１間には、ナット７１からのスラスト荷重を受ける軸受部材７９が介装されており、この軸受部材７９は、前記凹部７５内に突入される短円筒部７９ａを一体に有する。 A bearing member 79 that receives a thrust load from the nut 71 is interposed between the open end of the guide cylinder portion 59a and the nut 71, and the bearing member 79 is short that is inserted into the recess 75. It has a cylindrical portion 79a integrally.
　ここで前記パーキングブレーキレバー３４を前記非作動位置から前記作動位置側に駆動すべく前記ブレーキケーブル３７を牽引する際には、前記電動モータ４１の正転作動によって前記ねじ軸３９はその突部３９ａが前記リテーナ７７から離反する方向に移動するが、前記リテーナ７７の外周部が、前記軸受部材７９における前記短円筒部７９ａに接触することで前記皿ばね７６の前記凹部７５からの離脱が阻止される。また前記ブレーキケーブル３７を緩めるように前記電動モータ４１を逆転作動させたときには前記突部３９ａが前記リテーナ７７に近接する方向に前記ねじ軸３９が移動するが、前記ブレーキケーブル３７が非作動位置側に向けてばね付勢されているので、前記突部３９ａが前記リテーナ７７に当接するまでは前記電動モータ４１は無負荷状態となり、前記突部３９ａが前記リテーナ７７に当接した後には当該突部３９ａに前記リテーナ７７を介して前記皿ばね７６の弾性力が作用し、前記電動モータ４１に負荷がかかることになる。 Here, when the brake cable 37 is pulled to drive the parking brake lever 34 from the non-operating position to the operating position side, the screw shaft 39 has its protrusion 39a due to the forward rotation operation of the electric motor 41. Moves in a direction away from the retainer 77, but the outer peripheral portion of the retainer 77 comes into contact with the short cylindrical portion 79a of the bearing member 79 to prevent the disc spring 76 from detaching from the recess 75. NS. Further, when the electric motor 41 is reversely operated so as to loosen the brake cable 37, the screw shaft 39 moves in a direction in which the protrusion 39a approaches the retainer 77, but the brake cable 37 is on the non-operating position side. Since the spring is urged toward, the electric motor 41 is in a no-load state until the protrusion 39a abuts on the retainer 77, and after the protrusion 39a abuts on the retainer 77, the protrusion 39a. The elastic force of the disc spring 76 acts on the portion 39a via the retainer 77, and a load is applied to the electric motor 41.
　図４において、前記電動アクチュエータ３８における前記電動モータ４１には、電源８１の電力が駆動回路８２を介して供給されるものであり、前記電動モータ４１の作動すなわち前記駆動回路８２の作動は制御ユニットＣで制御される。この制御ユニットＣには、車両ユーザがパーキングブレーキ状態を解除するための操作を行なったことを検出してパーキングブレーキ状態を解除するための信号を出力する指示手段８３と、前記電動モータ４１への通電電流を検出する電流検出手段８４と、電動アクチュエータ３８を含む電動パーキングブレーキ装置で異常が生じたことを報知する報知手段８５とが接続される。 In FIG. 4, the electric power of the power supply 81 is supplied to the electric motor 41 in the electric actuator 38 via the drive circuit 82, and the operation of the electric motor 41, that is, the operation of the drive circuit 82 is a control unit. It is controlled by C. The control unit C is provided with an instruction means 83 for detecting that the vehicle user has performed an operation for releasing the parking brake state and outputting a signal for releasing the parking brake state, and the electric motor 41. The current detecting means 84 for detecting the energizing current and the notifying means 85 for notifying that an abnormality has occurred in the electric parking brake device including the electric actuator 38 are connected.
　前記制御ユニットＣは、そのパーキングブレーキ状態を解除するにあたって前記電動モータ４１を逆転作動させる際に、突入電流が生じると想定される設定時間Ｔ（図５参照）が前記電動モータ４１の逆転作動開始から経過した後に、前記電流検出手段８４で検出した電流値に基づく電流値の傾きで前記電動モータ４１の逆転作動停止を判断するものであり、前記電流値の傾きが所定値α０（図５参照）以上となるのに応じて前記電動モータ４１の逆転作動を停止する。 When the electric motor 41 is reverse-operated when the parking brake state is released, the control unit C starts the reverse operation of the electric motor 41 for a set time T (see FIG. 5) in which an inrush current is assumed to occur. After that, the inclination of the current value based on the current value detected by the current detecting means 84 is used to determine whether the reverse operation of the electric motor 41 is stopped, and the inclination of the current value is a predetermined value α0 (see FIG. 5). ) The reverse operation of the electric motor 41 is stopped according to the above.
　前記電流値の傾きは、（前記電流検出手段８４で検出した今回の電流値）－（たとえば４０ｍ秒前に前記電流検出手段８４で検出した前回の電流値）で得られた値を所定時間で除すことによって得られる。 The slope of the current value is a value obtained by (the current current value detected by the current detecting means 84)-(for example, the previous current value detected by the current detecting means 84 40 ms ago) at a predetermined time. Obtained by removing.
　ここでパーキングブレーキ状態を解除するための前記電動モータ４１の逆転作動時の電流値および電流値の傾きは、図５（ａ），（ｂ）で示すように変化するものであり、図５（ａ）で示すように、電動モータ４１の逆転作動開始直後に突入電流が生じることで一時的に電流が不安定となるが、その突入電流が生じると想定される設定時間Ｔが前記電動モータ４１の逆転作動開始から経過した時刻ｔ１から前記電流検出手段８４で検出した電流値に基づく電流値の傾きによる前記電動モータ４１の逆転作動停止判断が開始される。前記突入電流が生じたあとに、前記電動モータ４１が無負荷状態となることで前記電動モータ４１への通電電流は通常の状態では安定した状態となり、その安定状態が終了した時刻ｔ２から前記電動モータ４１に負荷がかかることによって前記電流検出手段８４で検出した電流値が増加することになり、それに応じて図５（ｂ）で示すように、電流値の傾きも大きくなってくる。そして前記電流値の傾きが前記所定値α０以上となった時刻ｔ３で前記電動モータ４１の逆転作動が停止されることになる。 Here, the current value and the inclination of the current value at the time of reverse operation of the electric motor 41 for releasing the parking brake state change as shown in FIGS. 5A and 5B, and FIG. As shown in a), the inrush current is generated immediately after the start of the reverse operation of the electric motor 41, so that the current becomes unstable temporarily. From time t1 elapsed from the start of the reverse operation of the electric motor 41, the determination of stopping the reverse operation of the electric motor 41 is started based on the inclination of the current value based on the current value detected by the current detecting means 84. After the inrush current is generated, the electric motor 41 becomes a no-load state, so that the energizing current to the electric motor 41 becomes a stable state in a normal state, and the electric motor 41 starts from the time t2 when the stable state ends. When the motor 41 is loaded, the current value detected by the current detecting means 84 increases, and as shown in FIG. 5B, the gradient of the current value also increases accordingly. Then, the reverse operation of the electric motor 41 is stopped at the time t3 when the slope of the current value becomes the predetermined value α0 or more.
　ところで、制動間隙自動調整手段１８の前回のパーキングブレーキ時の状態や、電動アクチュエータ３８がパーキングブレーキ状態に入るように作動している途中でパーキングブレーキ状態を解除して電動モータ４１の逆転作動を開始したとき等には、通常の状態では電動モータ４１が無負荷状態であって電流安定期間内であるべきとき、すなわち図５（ａ）の時刻ｔ１から時刻ｔ２までの間に電動モータ４１にかかる負荷が増大する状態が生じることが考えられるが、前記制御ユニットＣは、上記時刻ｔ１で電流値の傾きによる前記電動モータ４１の逆転作動停止判断を開始するので、そのような場合にも対処可能である。 By the way, the state of the braking gap automatic adjusting means 18 at the time of the previous parking brake, or the parking brake state is released while the electric actuator 38 is operating to enter the parking brake state, and the reverse operation of the electric motor 41 is started. When the electric motor 41 is in a no-load state and should be within the current stable period under a normal state, that is, the electric motor 41 is engaged between the time t1 and the time t2 in FIG. 5 (a). It is conceivable that a state in which the load increases may occur, but since the control unit C starts the reverse operation stop determination of the electric motor 41 based on the inclination of the current value at the time t1, such a case can be dealt with. Is.
　また前記制御ユニットＣは、前記電流値の傾きによる作動停止判断が不能であるとき，たとえば極端な低電圧状態にある場合、異常が生じた後の復帰作動の場合、その他の故障が生じた場合には、前記電流検出手段８４で検出した電流値が基準値に達したときに、前記電動モータ４１の逆転作動を停止する。 Further, when the control unit C cannot determine the operation stop due to the inclination of the current value, for example, when it is in an extremely low voltage state, when it is restored after an abnormality occurs, or when another failure occurs. When the current value detected by the current detecting means 84 reaches the reference value, the reverse operation of the electric motor 41 is stopped.
　さらに前記制御ユニットＣは、前記電流値の傾きが前記所定値α０よりも大きな第２の所定値以上となるのに応じて前記電動モータ４１が異常であると判断し、その旨を前記報知手段８５で報知する。 Further, the control unit C determines that the electric motor 41 is abnormal in response to the inclination of the current value becoming greater than or equal to the second predetermined value larger than the predetermined value α0, and the notification means to that effect. Notify at 85.
　次にこの実施の形態の作用について説明すると、制御ユニットＣは、電動モータ４１の逆転作動時に突入電流が生じると想定される設定時間Ｔが前記電動モータ４１の逆転作動開始から経過した後に、電流検出手段８４で検出した電流値に基づく電流値の傾きで前記電動モータ４１の逆転作動停止を判断し、前記電流値の傾きが所定値α０以上となるのに応じて前記電動モータ４１の逆転作動を停止するので、基本的には電動モータ４１が無負荷状態であるべき期間内に電動モータ４１に負荷がかかるようになっても速やかに電動モータ４１の逆転作動を停止することができる。 Next, the operation of this embodiment will be described. In the control unit C, the current is generated after the set time T, which is assumed to generate an inrush current during the reverse operation of the electric motor 41, elapses from the start of the reverse operation of the electric motor 41. The reverse operation stop of the electric motor 41 is determined by the inclination of the current value based on the current value detected by the detection means 84, and the reverse operation of the electric motor 41 is performed according to the inclination of the current value of α0 or more. Therefore, basically, even if a load is applied to the electric motor 41 within a period in which the electric motor 41 should be in a no-load state, the reverse operation of the electric motor 41 can be stopped promptly.
　また前記制御ユニットＣは、前記電流値の傾きによる作動停止判断が不能であるときには、前記電流検出手段８４で検出した電流値が基準値に達したときに、前記電動モータ４１の逆転作動を停止するので、極端な低電圧状態にある場合、異常が生じた後の復帰作動の場合、その他の故障が生じた場合には、電流値で電動モータ４１の逆転作動を停止することができる。 Further, the control unit C stops the reverse operation of the electric motor 41 when the current value detected by the current detecting means 84 reaches the reference value when it is impossible to determine the operation stop due to the inclination of the current value. Therefore, in the case of an extremely low voltage state, a recovery operation after an abnormality occurs, or another failure, the reverse operation of the electric motor 41 can be stopped by the current value.
　さらに前記制御ユニットＣは、前記電流値の傾きが前記所定値α０よりも大きな第２の所定値以上となるのに応じて前記電動モータ４１が異常であると判断するので、電流値の傾きが電動モータ４１の逆転作動停止の判断基準となる所定値αよりも大きな第２の所定値以上となったときには、電動モータ４１の逆転作動を停止するとともに異常状態であると判断することができる。 Further, the control unit C determines that the electric motor 41 is abnormal when the slope of the current value becomes greater than or equal to the second predetermined value larger than the predetermined value α0, so that the slope of the current value becomes higher. When the value becomes a second predetermined value or more, which is larger than the predetermined value α that is the criterion for determining the reverse operation stop of the electric motor 41, the reverse operation of the electric motor 41 can be stopped and it can be determined that the state is abnormal.
　以上、本発明の実施の形態について説明したが、本発明は上記実施の形態に限定されるものではなく、その要旨を逸脱することなく種々の設計変更を行うことが可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the gist thereof.

Claims (3)

  1. 　パーキングブレーキ状態を得る作動位置ならびにパーキングブレーキ状態を解除する非作動位置間での回動を可能とするとともに前記非作動位置側に向けて弾発付勢されるパーキングブレーキレバー（３４）と、当該パーキングブレーキレバー（３４）を前記非作動位置から前記作動位置に動かす動力を発揮する正転状態ならびに前記パーキングブレーキレバー（３４）を前記作動位置から前記非作動位置側に戻す際の逆転状態を切替え可能とした電動モータ（４１）を有して前記パーキングブレーキレバー（３４）に連結されるとともに前記電動モータ（４１）の逆転時に前記電動モータ（４１）に負荷を与えることを可能とした電動アクチュエータ（３８）と、前記電動モータ（４１）への通電電流を検出する電流検出手段（８４）と、前記電動モータ（４１）の逆転作動時に前記電流検出手段（８４）で検出した電流値の傾きが所定値以上となるのに応じて前記電動モータ（４１）の逆転作動を停止するようにして前記電動モータ（４１）の作動を制御する制御ユニット（Ｃ）とを備える電動パーキングブレーキ装置において、前記制御ユニット（Ｃ）は、前記電動モータ（４１）の逆転作動時に突入電流が生じると想定される設定時間が前記電動モータ（４１）の逆転作動開始から経過した後に、前記電流検出手段（８４）で検出した電流値に基づく電流値の傾きで前記電動モータ（４１）の逆転作動停止を判断することを特徴とする電動パーキングブレーキ装置。 The parking brake lever (34), which enables rotation between the operating position for obtaining the parking brake state and the non-operating position for releasing the parking brake state, and is elastically urged toward the non-operating position side, and the said Switching between the normal rotation state in which the parking brake lever (34) exerts the power to move the parking brake lever (34) from the non-operating position to the operating position and the reverse rotation state when the parking brake lever (34) is returned from the operating position to the non-operating position side. An electric actuator that has a enabled electric motor (41) and is connected to the parking brake lever (34) and can apply a load to the electric motor (41) when the electric motor (41) reverses. (38), the current detecting means (84) for detecting the energizing current to the electric motor (41), and the inclination of the current value detected by the current detecting means (84) during the reverse operation of the electric motor (41). In an electric parking brake device including a control unit (C) that controls the operation of the electric motor (41) by stopping the reverse operation of the electric motor (41) in response to a value equal to or higher than a predetermined value. The control unit (C) has the current detecting means (84) after a set time in which a rush current is assumed to occur during the reverse operation of the electric motor (41) has elapsed from the start of the reverse operation of the electric motor (41). The electric parking brake device, characterized in that the reverse operation stop of the electric motor (41) is determined by the inclination of the current value based on the current value detected in).
  2. 　前記制御ユニット（Ｃ）は、前記電流値の傾きによる作動停止判断が不能であるときには、前記電流検出手段（８４）で検出した電流値が基準値に達したときに、前記電動モータ（４１）の逆転作動を停止することを特徴とする請求項１に記載の電動パーキングブレーキ装置。 The control unit (C) has the electric motor (41) when the current value detected by the current detecting means (84) reaches a reference value when it is impossible to determine the operation stop due to the inclination of the current value. The electric parking brake device according to claim 1, wherein the reverse operation of the electric parking brake device is stopped.
  3. 　前記制御ユニット（Ｃ）は、前記電流値の傾きが前記所定値よりも大きな第２の所定値以上となるのに応じて前記電動モータ（４１）が異常であると判断することを特徴とする請求項１または２に記載の電動パーキングブレーキ装置。
          The control unit (C) is characterized in that the electric motor (41) is determined to be abnormal when the slope of the current value becomes greater than or equal to a second predetermined value larger than the predetermined value. The electric parking brake device according to claim 1 or 2.
PCT/JP2020/047374 2020-03-12 2020-12-18 Electric parking brake device WO2021181810A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008296849A (en) * 2007-06-04 2008-12-11 Hi-Lex Corporation Failure detection device of on-vehicle electronic control device
JP2009202618A (en) * 2008-02-26 2009-09-10 Hi-Lex Corporation Electric parking brake system of vehicle
JP2012127418A (en) * 2010-12-15 2012-07-05 Toyota Motor Corp Disc brake apparatus and control method thereof
JP2014019232A (en) * 2012-07-16 2014-02-03 Advics Co Ltd Brake device for vehicle
JP2016043798A (en) * 2014-08-22 2016-04-04 株式会社アドヴィックス Electric parking brake device
JP2019130938A (en) * 2018-01-29 2019-08-08 日立オートモティブシステムズ株式会社 Electric brake device and electric brake controller

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008296849A (en) * 2007-06-04 2008-12-11 Hi-Lex Corporation Failure detection device of on-vehicle electronic control device
JP2009202618A (en) * 2008-02-26 2009-09-10 Hi-Lex Corporation Electric parking brake system of vehicle
JP2012127418A (en) * 2010-12-15 2012-07-05 Toyota Motor Corp Disc brake apparatus and control method thereof
JP2014019232A (en) * 2012-07-16 2014-02-03 Advics Co Ltd Brake device for vehicle
JP2016043798A (en) * 2014-08-22 2016-04-04 株式会社アドヴィックス Electric parking brake device
JP2019130938A (en) * 2018-01-29 2019-08-08 日立オートモティブシステムズ株式会社 Electric brake device and electric brake controller

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