JP4928085B2 - Electric brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven cable driving device which can make the configuration of the operating amount detector of a cable simple and accurate, and to provide a motor-driven braking device. <P>SOLUTION: The motor-driven cable driving device 10 includes the motor M, a reduction gear G connected to the output shaft 25 of the motor, a nut member 26 connected to the output side of the reduction gear, a rod 32 screwed with the nut member 26 and guided so as not to be rotated by the guide member 34, and a control cable 15 having an inner cable 45 connected to the rod and a conduit 49 for guiding the inner cable. The motor-driven braking device is obtained, by connecting the control cable of the cable driving device 10 to a braking mechanism. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

The present invention relates to Dobu rake device electrodeposition such as automobiles. Motor vehicles include motorbikes, tricycles, power-assisted bicycles, golf carts, forklifts, and the like.

JP-T-2001-513179 JP-A-8-295210 JP 2004-161063 A

  Patent Document 1 discloses a vehicle parking brake 100 as shown in FIG. The parking brake 100 includes a gear member 101 formed on the outer periphery, a spline hub formed on the inner periphery, a component member 102 that is rotatably supported so as not to move in the axial direction, and the component member A hollow spline 103 that meshes with an inner peripheral spline hub and is movable in the axial direction, and a male screw member (spindle) 104 that engages with a female screw formed on the inner periphery of the spline. A first brake cable 105 is locked to one end of the spline 103, and a second brake cable 106 is locked to one end of the male screw member 104. The gear 101 on the outer periphery of the component member 102 is driven by the motor M, and when the motor rotates in one direction, the female screw of the spline 103 and the male screw member 104 are relatively screwed and the left and right brake cables 105 and 106 are rotated. They attract each other. As a result, the left and right brakes are applied.

  On the other hand, when the motor M rotates in the reverse direction, the female screw of the spline 103 and the male screw member 104 rotate relatively in the reverse direction to weaken the tension that the left and right brake cables 105, 106 attract. As a result, the brake is released. Since the telescopic device including the spline 103 and the male screw member 104 is axially movable with respect to the component member 102, the same force is applied to the left and right brakes. Thus, the parking brake of patent document 1 can apply | hang | release a parking brake with a motor, can be cancelled | released, and can equalize the brake force of right and left.

  Patent Document 2 discloses a parking brake device for an automobile including a motor M and a shaft 111 that is rotationally driven via a gear 110 by the rotation of the motor, as shown in FIG. A right screw 112 and a left screw 113 are formed on the left and right sides of the shaft 111, and nut members 114 and 115 are screwed into these screws. One end of each of the brake cables 105 and 106 is locked to these nut members.

  In this case, when the motor M rotates in one direction, the left and right nut members 114 and 115 are moved to the center side, respectively, whereby the left and right brakes can be applied. When the motor M rotates in the reverse direction, the left and right nut members 114 and 115 move outward. Thereby, the brake can be released.

  In Patent Document 3, as shown in FIG. 12, a screw shaft 116 that is rotationally driven by a motor M, a nut 117 that is screwed to the screw shaft, an equalizer 118 that is swingably provided on the nut, An electric parking brake device 122 including a pair of pull cables 119 and 120 connected to an equalizer and a pulley 121 for converting the direction of one cable 119 by 180 degrees is disclosed.

  Since the parking brake 100 of Patent Document 1 has a configuration in which the left and right brake cables 105 and 106 are pulled together, the tension between them can be equalized, and the space can be reduced. However, since a spline hub and a spline are required, the mechanism is complicated and the assembly work is complicated. On the other hand, the brake device of Patent Document 2 has a relatively simple mechanism and can equalize the left and right operation amounts. However, it is difficult to equalize the left and right braking forces.

  Moreover, although the electric parking brake apparatus (refer FIG. 12) of patent document 3 can make the left-right brake force substantially equal by the equalizer 118, the space | interval of the right-and-left cables 119 and 120 expands. For this reason, the housing 123 becomes large and a large mounting space is required. Further, when a force is applied to the two cables 119 and 120, a large torque is applied to the housing 123. Therefore, it is necessary to increase the strength of the housing 123 and mounting screws.

The present invention is directed to an object to provide an electric brake apparatus that can be the operation of the cable with high precision. It is another object of the present invention to provide a parking brake device that has a simple mechanism, can substantially equalize the left and right braking forces, and does not generate a large torque in the housing even when force is applied to the left and right cables. It is said.

An electric brake device according to the present invention (Claim 1) includes a cable drive device, a brake lever of a parking brake to which a cable operated by the cable drive device is coupled, and a spring that biases the brake lever toward the brake release side. And a brake friction member connected to a brake lever, such as an automobile, wherein the cable driving device is connected to a motor capable of rotating in the forward and reverse directions and an output shaft of the motor. and that the reduction gear, and a male screw which is connected to the output side of the reduction gear, with screwed to the male screw, a nut member further linear motion in the rotation of the male screw, swingably to the nut member an equalizer provided, and a cable connected to the equalizer, and means for detecting an operation amount of the cable, the nut member is made of a synthetic resin A columnar main body and a nut that is fixed in the main body and into which the male screw is screwed, and the equalizer has a bottomed cylindrical portion, and the columnar main body of the nut member is provided in the bottomed cylindrical portion. The detection means comprises means for counting the output of the pulse generation means for generating a pulse in accordance with the rotation of the motor and converting it into the amount of operation of the cable. The parking brake is operated by rotating or stopping the motor forward or backward based on the converted cable operation amount.

In such an electric brake device, the means for converting the operation amount of the cable is a pulse generator.
Receives the pulse output from the raw means, counts the number of pulses, converts it to a signal indicating the cable position, and receives the obtained cable position signal to control forward, stop and reverse rotation of the motor And a microprocessor for generating a control signal for the number of revolutions (claim 2).

In the electric brake device of the present invention, when the motor rotates in one direction, for example, in the direction of pulling the cable, the rotating member rotates and drives the rectilinear member in the direction of pulling the cable by the conversion mechanism. Further, when the motor rotates in the other direction, the force for pushing or pulling the cable is weakened. Thereby, the reciprocating operation of the cable can be performed. Since the amount of operation of the cable at that time corresponds to the number of rotations (or rotation angle) of the motor, the pulse generating means generates a number of pulses corresponding to the amount of operation of the cable. As a result, the converting means counts the number of pulses and converts it to the amount of operation of the cable, so that it is possible to detect the amount of operation of the cable with high accuracy.
Further, since the rotation member of the conversion mechanism is a male screw and the rectilinear member is a nut member that is screwed with the male screw, when the motor rotates and the male screw rotates, the nut member screwed to the nut member Move in the axial direction. Thereby, the cable connected to the nut member is operated in the axial direction. And since rotation is converted into a linear motion by a screw mechanism, a large deceleration action (power-increasing action) can be obtained even at that portion. Also, the axial external force transmitted through the cable is not converted into the rotational force of the rotating member, and does not affect the speed reducer or the motor.
Further, since the equalizer is swingably provided on the nut member, the two cables can be synchronously pulled or loosened (pressed), and the difference in operating force between the two cables is as follows. Absorbed by the equalizer. Therefore, two operation objects can be operated in synchronism with equal force.

When the cable is a cable for operating a parking brake of a motor vehicle, by the operation amount of the accuracy of the cable is improved, thereby enabling fine adjustment of the braking force. Therefore, the brake operation can be performed with a more appropriate braking force as compared with the conventional electrically driven parking brake device. The configuration is simple and the control accuracy of the braking force is high.

Next, an embodiment of the electric brake device of the present invention will be described with reference to the drawings. 1 is a partially sectional plan view showing an example of a cable driving device outside the scope of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. 4 is a block diagram showing a motor control circuit in the cable drive device of FIG. 1, FIG. 5 is a schematic plan view showing an example of an electric brake device using the cable drive device of FIG. 1, and FIG. 6 is an electric brake of the present invention. schematic plan view showing an embodiment of a cable drive device used in the apparatus, FIG. 7 is sectional view taken along line VII-VII of Figure 6, Figure 8 is a fragmentary perspective view of the equalizer and nut member in Figure 6, Figures 9a and 9b These are the perspective view and sectional drawing which show other embodiment of a nut member, respectively.

  A cable driving device 10 shown in FIG. 1 includes a housing 13 including a main body 11 and a cover 12, a motor M attached to the housing, a speed reducer G that is housed in the housing 13 and decelerates rotation of the motor, A screw-nut mechanism (rotation / straight translation conversion mechanism) 14 connected to the output unit of the machine and a control cable 15 driven reciprocally by the screw-nut mechanism are provided. Reference numeral 16 denotes a base bracket for holding the housing 13.

  The main body 11 of the housing 13 is provided with a mounting seat 21 for mounting the motor M, and the motor M is fixed by screws (reference numeral 22 in FIG. 2). Between the main body 11 and the cover 12, a first shaft 23 and a second shaft 24 that support the gears of the speed reducer are arranged in parallel with the output shaft 25 of the motor M and fixed. Further, a nut member 26 of the screw-nut mechanism 14 is rotatably supported on the housing 13. The rotation center of the nut member 26 is parallel to the output shaft 25 of the motor M.

  The reduction gear G is rotatably supported by a pinion 27 fixed to the output shaft 25 of the motor M, a first shaft 23, and a first gear 28 that meshes with the pinion 27, and can be rotated by the second shaft 24. The second gear 29 is supported and meshed with the first gear 28, and the third gear 30 is fixed to the outer periphery of the nut member 26 and meshed with the second gear 29. As shown in FIG. 2, the first gear 28 includes a large-diameter gear 28a that meshes with the pinion 27, and a small-diameter gear 28b that rotates integrally with the large-diameter gear. The second gear 29 includes a large-diameter gear 29a that meshes with the small-diameter gear 28b of the first gear, and a small-diameter gear 29b that rotates integrally with the large-diameter gear and meshes with the third gear 30. In FIG. 2, in order to avoid complication, each gear indicates only an effective diameter with a one-dot chain line.

  In the reduction gear G, when the rotation of the motor M is transmitted from the pinion 27 to the large-diameter gear 28a of the first gear, and when it is transmitted from the small-diameter gear 28b of the first gear to the large-diameter gear 29a of the second gear. , And the second gear small-diameter gear 29b is transmitted to the third gear 30 to reduce the speed, and the overall effect of a three-stage reduction is achieved. If the gear ratios are 1/3, for example, the overall reduction ratio is 1/27.

  Returning to FIG. 1, the screw-nut mechanism 14 restricts the rotation of the rod member 26, the rod 32 screwed into the nut member 26, the square slider 33 fixed to the rod, and the rod. Therefore, a guide member 34 for slidably guiding the slider 33 is provided. The nut member 26 has a cylindrical shape and is rotatably supported by a cylindrical receiving portion 11a provided in the main body 11 of the housing. A female screw 35 is formed on the inner surface of the tip of the nut member 26. A flange 36 is formed on the outer periphery of the central portion in the longitudinal direction to support a thrust load during cable operation, particularly a reaction force when the cable is pulled. Reference numerals 37 and 38 denote C-rings that hold washers 39 and 40 that receive a thrust load, and are fitted into an annular groove formed on the outer periphery of the nut member 26.

  A rectangular through hole for preventing rotation is formed on the inner periphery of the third gear 30, and the flat surface of the nut member 26 that fits with the third gear 30 has four flat portions that fit into the through hole. A surface 41 is formed. Further, the base end of the nut member 26, that is, the end opposite to the side where the female screw 35 is formed protrudes from the cover 12, and the engaging member 42 for manually performing the brake release operation in the end. Is fixed with caulking. The engagement member 42 includes an engagement hole 42a having a hexagonal cross section for fitting with a so-called hexagon wrench. Further, a stopper 43 made of rubber or the like is attached to the inner surface of the engaging member 42.

  In the vicinity of one end of the rod 32, a male screw 44 that is screwed with the female screw 35 of the nut member 26 is formed. At the other end, a hole 46 is formed in which the end of the inner cable 45 of the control cable 15 is fitted and fixed by caulking or the like. The periphery of the hole is a thin cylindrical portion, which is formed into a square portion 47 during the caulking process. The slider 33 is fitted and fixed to the outer periphery of the square portion. As shown in FIG. 3, the outer periphery of the slider 33 has a substantially rectangular shape, and is fitted so as to be slidable in the axial direction so as not to rotate with the inner surface of the cylindrical guide member 34. The proximal end of the guide member 34 is fitted and fixed to the outer periphery of the receiving portion 11a provided on the main body 11 of the housing.

The control cable 15 is a well-known cable comprising a flexible conduit 49 and the aforementioned inner cable 45 slidably accommodated in the conduit. The conduit 49 is composed of an armor layer in which a metal wire having a square cross section is tightly wound in a spiral shape and a synthetic resin coating provided on the outer periphery thereof. A tube-shaped liner made of synthetic resin may be provided on the inner surface. The inner cable 45 is formed by twisting metal strands, and in this example , a synthetic resin coat is provided on the outer periphery thereof.

A cylindrical casing cap 50 is fixed to the end portion of the conduit 49 by caulking or the like, and a flange portion provided on the casing cap is fixed to a flange portion (reference numeral 34a in FIG. 3) of the free end of the guide member 34. Has been. A cylindrical cushion rubber 51 is provided at the inner end of the casing cap 50. The end portion of the inner cable 45 is fitted into the hole 46 of the rod 32 as described above, and is fixed by caulking or the like. In this example , the control cable 15 employs a pull control cable that transmits a pulling force. However, a push-pull control cable may be used depending on the application.

  In the screw-nut mechanism 14 and the control cable 15 configured as described above, when the third gear 30 rotates, the nut member 26 also rotates together. Since the rod 32 screwed into the nut member 26 is restricted in rotation by the guide member 34 and the slider 33, the rod 32 rotates relative to the nut member 26 and moves in the axial direction. Thereby, the inner cable 45 connected to the rod 32 is operated in the axial direction. In the screw-nut mechanism 14, the rod 32 moves by one pitch (one lead) of the screw when the nut member 26 makes one rotation.

  For example, a DC brushless motor having a three-phase coil phase is used as the motor M. In the circuit shown in FIG. 4, position detection sensors Se <b> 1 to Se <b> 3 are provided between the rotor of the motor M and a fixed element (for example, a motor housing) facing the rotor to reversely excite the magnetic poles of the coil phase. . As such a sensor, a combination of three detection magnets provided on the rotor and a Hall IC sensor (Hall effect element sensor) provided on the motor housing is suitable. Instead of the detection magnet, a drive magnet that acts on the coils Co1 to Co3 can be used. The configuration is simpler. In addition to the three Hall IC sensors, other sensors such as an optical sensor can also be used. The outputs of these sensors are sent to a motor driver 54 equipped with an amplifying circuit 52 such as a comparator, a commutation circuit 53 for inverting the magnetic pole of the coil, and the like.

In the cable driving device used in the present invention , the pulse output of the sensor is sent to the cable operation position detection circuit 55, the number of pulses is counted, and converted into a signal indicating the cable position. The obtained cable position signal is basically sent to the microprocessor 56 as a position signal to be operated by the cable, and the operation switch SW for ON / OFF operation of the brake and the motor based on various interlock signals. Control signals for forward, stop, and reverse rotation of M and a control signal for the rotational speed are generated, and the motor M is rotated / stopped via the motor driver 54. Changes in cable reference position due to compensation of permanent elongation of the inner cable, wear of brake friction members, etc. are calculated and stored every time or several times of brake operation, and should be used for appropriate brake operation. Can do.

  In the cable drive device 10 described above, when the motor M rotates once, the speed reduction gear G reduces the speed to 1/27, for example, and the nut member 26 rotates 1/27. Thereby, the inner cable 45 is operated by 1/27 of one pitch of the screw. If, for example, ten detection magnets are provided on the second gear 29 and a Hall IC element for detecting these magnets is provided on the cover 12 of the housing, 10/9 pulses are generated per one rotation of the motor. However, when the excitation sensor built in the motor M is counted, the resolution becomes 2.7 times as high as 3/10 × 9 even if the rotation of the motor M is 3 pulses.

Next, an example of an electric brake device including the cable driving device will be described with reference to FIG. The electric brake device 60 includes the cable drive device 10 described above, an equalizer 61 that is swingably connected to the other end of the control cable 15, and left and right second control cables 62 and 62 that are connected to the equalizer. And a brake mechanism 63 connected to the other end side of the second control cable 62. The brake mechanism 63 includes a brake drum 64, a brake shoe 65 attached to the brake drum 64, a return spring 66 that biases the brake drum 64 in the return direction (arrow R direction), and parking that is operated by the second control cable 62. It is a well-known thing provided with the lever 67. FIG.

  In the electric brake device 60, the brake drum 64 is rotated in the arrow R direction by the urging force of the return spring 66 in a normal state, and the brake is released. When the driver turns on the switch SW, the motor M of the cable driving device 10 rotates in one direction, the nut member 26 in FIG. 1 rotates, and the rod 32 is pulled into the nut member. Thereby, the inner cable 45 of the control cable 15 connected to the rod is pulled, and the inner cables of the two second control cables 62 are pulled through the equalizer 61 shown in FIG. As a result, the parking lever 67 rotates in the brake operating direction (arrow K) to apply the brake. At the time of this braking action, a stop signal is issued in comparison with the data stored in advance by the cable operation position detection circuit, and the motor stops.

  When the driver releases the brake, the motor M is rotated in the reverse direction by operating the switch (reference numeral SW in FIG. 4), and the rod 32 is sent out from the nut member 26. Thereby, the inner cord 45 is pulled back by the biasing force of the return spring 66 of the brake mechanism 63 via the inner cords of the two second control cables 62 and the equalizer 61 shown in FIG. At the timing of stopping the motor M, it is necessary that the brake is sufficiently applied and the inner cable 45 or the like is not slackened. As described above, since the control of the motor M of the cable driving device 10 is highly accurate, the brake operation is appropriately performed, the useless wear of the friction member is suppressed, and the inner cable 45 is loosened or excessively stretched. Wear is suppressed.

The electric brake device 60 as described above is normally used for operating a parking brake. However, it is preferable to be able to operate as an emergency brake to replace the service brake in an emergency. In the above example , a three-phase brushless motor is used as the motor M. However, a motor with a brush may be used, and an excitation type motor having three or more phases may be used.

  When using a motor that does not have pulse generation means such as a motor with a brush, it is possible to provide means for generating pulses by rotation of the output shaft of the motor, a gear of a reduction gear, a nut member, or the like. . As such a pulse generating means, a combination of a detection magnet provided on a rotating member such as a rotating shaft or a gear and a Hall IC sensor (Hall effect element sensor) provided on a fixed element such as a casing can be adopted. As a detection magnet, one multipolar magnet is basically used.

The cable operating device used in the present invention can be used not only for brake operation but also for various applications as a linear actuator that pushes and pulls various cables. When the cable is pushed and pulled, a push-pull cable is used.

  The cable driving device 70 shown in FIGS. 6 and 7 includes a screw-nut mechanism that pulls and returns the two control cables 15 and 15 in synchronization. Since the motor M and the speed reducer G are substantially the same as the cable drive device 10 of FIG. 1 and FIG. In this cable drive device 70, a male screw 44 is formed on a screw shaft 71 that supports the third gear 30, and a nut member 26 is screwed to the male screw, and both constitute a screw-nut mechanism. ing. As shown in FIGS. 7 and 8, the nut member 26 includes a cylindrical main body 26a made of synthetic resin and a metal prismatic nut 26b fixed in the main body by insert molding. As shown in FIG. 7, the nut member 26 is rotatably held by the bottomed cylindrical portion 61 a of the equalizer 61. As shown in FIG. 8, the equalizer 61 is a part formed by bending or drawing a metal plate. The center portion has two bottomed cylindrical portions 61a facing each other, and the upper end and the lower end are two metal plates. Are arranged in a face-to-face relationship. The top two metal plates are connected. The bottomed cylindrical portion 61a of the equalizer 61 is guided by the inner surface of a cylindrical guide member 72 so as to be slidable in the cable moving direction.

  The conduits of the two control cables 15 and 15 are fixed by casing caps 50 and 50 at the tip of the cylindrical guide member 72 fixed to the housing 11. One ends of the casing caps 50, 50 enter the inside of the guide member 72, and a support plate 73 is fixed to their tips. The support plate 73 rotatably supports the tip of the screw shaft 71. The ends of the inner cables 45, 45 of the two control cables 15, 15 are held in locking holes 75, 75 formed at the upper and lower ends of the equalizer 61 by cable ends 74, 74 fixed to the ends. ing.

  Since the cable driving device 70 can perform the pulling operation and the returning operation by synchronizing the inner cables 45 of the two control cables 15 and 15, the control cables 15 and 15 are connected to the second control cable shown in FIG. Like the cables 62, 62, it can be directly connected to the brake mechanism 63.

  9a and 9b show a case where a grease reservoir 76 is provided on the nut member 26. FIG. The grease reservoir 76 is open on the upper surface side, and a female screw 78 is formed in a protruding portion 77 protruding forward and backward. As shown in FIG. 9b, the nut member 26 is constrained from rotating by the guide member 72 via the equalizer 61, so that the grease does not flow even if the grease reservoir 76 opened on the upper surface side is provided. Furthermore, since the opening of the grease reservoir 76 is blocked by the equalizer 61, the grease is protected. In the cross-sectional view of FIG. 7, the left side of the drawing is usually the upper side. The same applies to FIG. However, other orientations are possible.

  The grease may be semi-solid or fluid. By providing the grease reservoir 76 as described above, the interval between grease supply can be greatly extended. Therefore, it is easy to supply grease to the nut member 26 surrounded by the guide member 72.

It is a partial cross section top view which shows an example of the cable drive device outside the scope of the present invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a block diagram which shows the control circuit of the motor in the cable drive device of FIG. It is a schematic plan view which shows an example of the electric brake device using the cable drive device of FIG. It is a schematic plan view which shows one Embodiment of the cable drive device used for the electric brake device of this invention . It is the VII-VII sectional view taken on the line of FIG. It is a principal part perspective view of the equalizer and nut member in FIG. 9a and 9b are a perspective view and a sectional view showing another embodiment of the nut member, respectively. It is a perspective view which shows an example of the conventional electric parking brake drive device. It is sectional drawing which shows the other example of the conventional electric parking brake drive device. It is a top view which shows the further another example of the conventional electric parking brake drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cable drive device 11 Main body 11a Receiving part 12 Cover 13 Housing 14 Screw-nut mechanism 15 Control cable 16 Base bracket 21 Mounting seat 22 Screw M Motor G Reduction gear 23 1st axis | shaft 24 2nd axis | shaft 25 Output shaft 26 Nut member 26a Main body 26b Nut 27 Pinion 28 First gear 28a Large diameter gear 28b Small diameter gear 29 Second gear 29a Large diameter gear 29b Small diameter gear 30 Third gear 32 Rod 33 Slider 34 Guide member 34a Flange portion 35 Female thread 36 Flange 37, 38 C ring 39, 40 Washer 41 Flat surface 42 Engagement member 42a Engagement hole 43 Stopper 44 Male screw 45 Inner cable 46 Hole 47 Square part 49 Conduit 50 Casing cap 51 Cushion rubber Se1-3 Sensor Co1-3 Coil 52 Amplifier circuit 53 Commutation Circuit 5 4 Motor driver 55 Cable operation position detection circuit 56 Microprocessor SW switch 60 Electric brake device 61 Equalizer 61a Bottomed cylindrical portion 62 Second control cable 63 Brake mechanism 64 Brake drum 65 Brake shoe 66 Return spring 67 Parking lever 70 Cable drive device 71 Screw shaft 72 Guide member 73 Support plate 74 Cable end 75 Locking hole 76 Grease reservoir 77 Protrusion 78 Female thread

Claims (2)

A cable drive device, a brake lever of a parking brake to which a cable operated by the cable drive device is connected, a spring for urging the brake lever toward the brake release side, and a brake friction member connected to the brake lever An electric brake device such as an automobile equipped with
The cable driving device is screwed into the male screw capable of rotating forward and reverse, a speed reducer coupled to the output shaft of the motor, a male screw coupled to the output side of the speed reducer , It includes a nut member to further linear motion in the rotation of the male screw, and the equalizer swingably mounted in the nut member, and a cable connected to the equalizer, and means for detecting an operation amount of the cable,
The nut member comprises a cylindrical body made of synthetic resin, and a nut that is fixed in the body and into which the male screw is screwed,
The equalizer has a bottomed cylindrical portion;
A cylindrical body of a nut member is rotatably held in the bottomed cylindrical portion,
The means for detecting comprises means for counting the output of the pulse generating means for generating a pulse in accordance with the rotation of the motor and converting it to an amount of operation of the cable;
An electric brake device that operates the parking brake by rotating or stopping the motor forward or backward based on the converted cable operation amount. Means for converting the operation amount of the cable,
A cable operation position detection circuit that receives a pulse output from the pulse generation means, counts the number of pulses, and converts it to a signal indicating a cable position;
The electric brake device according to claim 1, further comprising: a microprocessor that receives the obtained cable position signal and generates a control signal for normal rotation, stop, reverse rotation, and rotation speed of the motor.