JP5717605B2 - Electric parking brake device - Google Patents

Description

  The present invention relates to an electric parking brake device, and more particularly to an electric parking brake device in which a parking lever that frictionally engages a brake lining of a brake shoe with a brake drum is rotated by a motor.

  For example, Patent Document 1 describes the following electric parking brake device. In this electric parking brake device, a pressing device that presses the brake shoe to press the brake lining against the brake drum is provided in the vicinity of the anchor block that supports one end of the brake shoe. This pressing device includes a motor, a worm, a worm wheel, a screw member, and a shoe pressing rod. The motor is fixed such that the main body of the motor projects toward the vehicle with respect to the back plate (backing plate), and the output shaft of the motor projects through the through hole formed in the back plate to the brake drum side. The worm is inserted into the output shaft of the motor. A screw member is integrally held via a key on the inner peripheral side of the worm wheel.

  A female screw is formed on the inner peripheral side of the screw member, and a male screw that can be screwed into the female screw of the screw member is formed on the outer peripheral side of the shoe pressing rod. The shoe pressing rod is held so as to be movable relative to the screw member in the axial direction. The end of the shoe pressing rod is sandwiched between the brake shoes, and rotation around the axis of the shoe pressing rod is prevented. The screw member is held so as to be rotatable relative to the housing via a bearing. In this electric parking brake device, the rotational motion of the motor is converted into a linear motion, the shoe pressing rod moves in the axial direction, and the brake shoe is pressed to frictionally engage the brake lining with the brake drum.

  In the electric parking brake device described in Patent Document 1, the main body of the motor is fixed so as to protrude inward of the vehicle with respect to the back plate. Therefore, the motor is exposed to the outside of the brake drum, which is not preferable from the viewpoint of waterproofness and dustproofness. Therefore, for example, Patent Document 2 describes the following electric parking brake device. This electric parking brake device includes an expansion / contraction device that expands a brake shoe and presses a brake lining against a brake drum, a motor that drives the expansion / contraction device, and the like. The motor is fixed so as to protrude toward the inside of the vehicle with respect to the back plate, and is covered with a cover. Thereby, the waterproofness and dustproofness of a motor can be ensured.

JP 2009-92092 A (paragraph numbers 0008, 0009, FIGS. 3 and 4) Japanese Patent Laying-Open No. 2011-99458 (paragraph number 0038, FIGS. 1 and 2)

  In the electric parking brake devices described in Patent Documents 1 and 2, since the motor is protruded and fixed to the inside of the vehicle, it may interfere with the vehicle-side hub component. In order to improve this point, the motor may be housed inside the brake drum. However, since it is necessary to avoid interference between the motor and the anchor block or the vehicle-side hub component, the motor storage space inside the brake drum is limited. And since the motor which demonstrates the output according to a vehicle weight enlarges, it may be unable to be accommodated in a brake drum. If the size of the brake drum itself is increased, the motor can be accommodated inside the brake drum, but there is a problem that the types of vehicles to which the brake drum can be attached are limited.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric parking brake device excellent in mountability inside a brake drum of a drive unit such as a motor for rotating a parking lever. .

  In order to solve the above-described problem, the invention according to claim 1 is provided with a back plate whose outer surface is fixed to the mounting portion on the vehicle body side, and an inner surface of the back plate that is rotatable around the rotation axis. A pair of brake shoes each having a brake lining that can be frictionally engaged with a brake drum provided, and rotatably supported on the back plate; a fixed portion fixed to the back plate; and the pair of brakes An anchor block provided with an anchor portion for supporting one end portion of the shoe and one end of the brake shoe are rotatably supported, and a connecting member is interposed between the other brake shoe and By moving the pair of brake shoes, the pair of brake shoes are expanded to the brake drum side with one end portion supported by the anchor block as a fulcrum. A parking lever that frictionally engages the lining with the brake drum, and a rotating member and an axially moving member that are fitted to each other via a conversion mechanism that converts rotational motion into linear motion are supported by the case, and the axially moving member rotates. And a drive unit that is coupled to the other end of the parking lever and that rotates the rotating member by a motor to rotate the axially moving member to rotate the parking lever. In the brake device, the anchor block is formed of a plate-like member having both end portions projecting in opposite directions, and one end portion of the both end portions extends in a direction perpendicular to the rotation axis to form the fixing portion, The other end portion forms the anchor portion, and an intermediate portion connecting the both end portions is formed as a connecting portion to which the driving portion is attached.

  According to a second aspect of the present invention, in the first aspect, the anchor portion is provided with a notch portion that allows insertion of at least a part of the driving portion in order to attach and detach the driving portion to and from the coupling portion. It is that you are.

  According to a third aspect of the present invention, in the first or second aspect, the back plate is provided with a first concave portion that is recessed toward the outer surface side and a second concave portion that is shallower than the first concave portion and is recessed toward the outer surface side, That is, at least a part of the driving part mounted on the connecting part is accommodated in the first concave part, and the fixing part is fixed to the bottom part of the second concave part.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, an attachment portion for detachably attaching a case of the drive portion is provided protruding from the connection portion.

  According to a fifth aspect of the present invention, in any one of the first to third aspects, the anchor block is formed by press-molding the plate-like member.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the mounting portion for detachably mounting the case of the driving portion is integrally protruded from the connecting portion by press molding.

  According to the first aspect of the present invention, the anchor block is formed of a plate-like member having both end portions projecting in opposite directions, that is, a plate-like member having a substantially S-shaped side surface. One end portion of the anchor block is formed as a fixing portion fixed to the back plate, and the other end portion of the anchor block is formed as an anchor portion that supports one end portions of the pair of brake shoes. Since the side surface shape of the anchor block is formed in a substantially S shape, a space can be secured between the fixing portion and the anchor portion. Therefore, this space can be used as an installation space for the drive unit, and an intermediate part for connecting both end portions of the anchor block can be formed as a connection unit to which the drive unit is mounted. Thereby, an anchor block and a drive part are arranged so that it may overlap in the direction of the axis of rotation of a brake drum.

  Here, in the brake drum, the anchor block, the vehicle-side hub part, and the like are arranged in a direction perpendicular to the rotation axis direction of the brake drum, so the arrangement space in the rotation axis direction of the brake drum is the rotation axis line of the brake drum. There is a margin compared to the arrangement space in the direction perpendicular to the direction. Accordingly, the anchor block and the drive unit are arranged in the direction of the rotation axis of the brake drum so that the anchor block and the drive unit can be arranged inside the brake drum. Therefore, the drive part excellent in the mountability to the inside of a brake drum can be comprised.

  Further, by fixing the drive unit to the back plate via the anchor block, the drive unit is protected by the back plate. Therefore, the waterproofness and dustproofness of the drive unit can be improved. In addition, since the anchor block and the case of the drive unit can be configured by separate members, it is possible to select the necessary materials for each function of the anchor block and the case of the drive unit, thereby reducing weight and cost. Can be achieved.

  According to the invention which concerns on Claim 2, the notch part which accept | permits at least one part insertion of the drive part supported by the connection part is provided in the anchor part. Thereby, the operator can perform the operation | work which attaches / detaches a drive part with respect to a connection part through a notch part. Therefore, the drive part excellent in the assembly | attachment property to the inside of a brake drum can be comprised.

  According to the third aspect of the present invention, the first recess that accommodates at least a part of the drive unit is formed by denting the back plate toward the vehicle. Thereby, the arrangement space of a drive part can be expanded. Therefore, it is possible to mount various sizes of drive units that exhibit output in accordance with the vehicle weight inside the brake drum.

  Moreover, the 2nd recessed part which fixes the fixing | fixed part of an anchor block is formed by denting a backplate to the vehicle side with a dent shallower than a 1st recessed part. Thereby, compared with the case where a fixing | fixed part is fixed to a 1st recessed part, the distance of a fixed part and a drive part can be made small, and the moment of the force at the time of the drive of the drive part concerning a fixed part can be made small. Therefore, it is possible to improve the safety in terms of strength of the back plate due to the fixing portion of the anchor block being fixed.

  According to the invention which concerns on Claim 4, the mounting part which mounts | wears with the case of a drive part so that attachment or detachment is possible is protrudingly provided by the connection part. Thereby, a drive part can be easily mounted on a mounting part.

  According to the invention which concerns on Claim 5, the anchor block is formed by press-molding a plate-shaped member. Thereby, the manufacturing cost of an anchor block can be reduced.

  According to the invention which concerns on Claim 6, the mounting part which mounts | wears with the case of a drive part so that attachment or detachment is possible is integrally carried out by press molding by the connection part. Thereby, the manufacturing cost of the anchor block provided with the mounting part can be reduced.

It is the perspective view which looked at one embodiment of the electric parking brake device concerning the present invention from the brake drum side. It is the perspective view which looked at the electric parking brake device of FIG. 1 from the attachment part side of the vehicle body. It is the top view which looked at the electric parking brake apparatus of FIG. 1 from the rotating shaft direction of the brake drum. It is the sectional view on the AA line which looked at the electric parking brake device of Drawing 3 from the direction perpendicular to the axis of rotation of a brake drum. (A), (B) is the figure which looked at the connection state of the drive part of an electric parking brake device, and a parking lever from the rotation axis line direction of a brake drum, and the direction orthogonal to the rotation axis line. It is a BB sectional view showing the motor of the drive part of the electric parking brake device of Drawing 4, a rotation member, and an axial movement member. It is an expansion perspective view which shows the anchor block of an electric parking brake apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1-4, the electric parking brake apparatus 1 is comprised by the drum brake 10 provided with the parking brake mechanism, and the drive part 20 which drives a parking brake mechanism.

  As shown in FIGS. 1 and 3, the drum brake 10 includes a pair of brake shoes 11a and 11b, a pair of brake linings 12a and 12b, a parking lever 13, a connecting member 14, a back plate 15, and a brake drum. 16 (see FIG. 3) and an anchor block 17 schematically.

  The pair of brake shoes 11a and 11b are formed in an arc shape, and lining attaching portions 111a and 111b to which the pair of brake linings 12a and 12b are attached are respectively provided on the outer peripheral side. The pair of brake shoes 11a and 11b are arranged so that they can be expanded on both sides with respect to the center of the brake drum 16 and the pair of brake linings 12a and 12b can be contacted and separated from the inner periphery of the brake drum 16. While being rotatably supported on the inner surface 15 c of the plate 15, one end portions 112 a and 112 b are supported on an anchor block 17 fixed to the inner surface 15 c of the back plate 15.

  The parking lever 13 is disposed along one side of the brake shoe 11a such that one side (a left side in FIG. 1 in this example) of the parking lever 13 is rotatably supported by a rotational support part 13a. And the connecting member 14 is inserted between the parking lever 13 and the other brake shoe 11b.

  As shown in FIG. 5, a through hole 13 aa that allows the parking lever 13 to tilt is formed in the rotation support portion 13 a of the parking lever 13. The other end side of the parking lever 13 is bent in a substantially inverted J shape that is substantially symmetrical with respect to the lever axis L2 of the parking lever 13 that is orthogonal to the rotation axis L1 of the rotation support portion 13a on the one end side. On the inner peripheral side of the bent portion 13b of the parking lever 13, opposed surfaces 13c and 13c that are substantially parallel to the lever axis L2 are formed. One end portion (left end side in FIG. 3) of a screw shaft member 27 described later passes through between the opposing surfaces 13c and 13c of the bent portion 13b.

  As shown in FIGS. 1 and 3, the back plate 15 is formed in a disk shape, and the outer surface is fixed to a mounting portion on the vehicle body side. That is, the back plate 15 is not shown on the back side of the paper in FIGS. 1 and 3 from the back plate 15 by bolts (not shown) inserted through bolt holes 15b (four in this example) in the center of the back plate 15. It is fixed to a mounting part (non-rotating body) on the vehicle body side. The brake drum 16 is disposed on the inner surface 15 c side of the back plate 15 and is rotatable about the rotation axis R.

  Further, as shown in FIG. 2, the outer surface of the inner surface 15 c of the back plate 15 is arranged so that at least a part of a case 24 of the driving unit 20 described later can be accommodated in the portion where the driving unit 20 is disposed. A first recess 151a that is recessed toward the 15d side is provided. Further, in the portion of the inner surface 15c of the back plate 15 where the anchor block 17 is fixed, the fixing portion 17a of the anchor block 17 described later can be fixed, rather than the first recess 151a that is recessed toward the outer surface 15d. A shallow concave second recess 152a is provided. The 1st recessed part 151a and the 2nd recessed part 152a are provided continuously. The first concave portion 151a and the second concave portion 152a may be formed by deep drawing, for example, in which the outer surface 15d viewed from the mounting portion side of the vehicle body is convex, but is not limited thereto. For example, a case where only the inner surface 15c is recessed (the outer surface 15d does not become convex) is also included.

  As shown in FIGS. 1 and 3, the drive unit 20 is schematically configured by a motor 21, a rotation-linear motion conversion mechanism 22, a motion transmission member 23 (see FIG. 3), and a case 24.

  As shown in FIG. 6, the portion of the motor 21 on the rotating shaft 21 a side is accommodated and fixed in the case 24. The rotation / linear motion conversion mechanism 22 includes a pinion 25, a nut member 26 (corresponding to the “rotating member” of the present invention), and a screw shaft member 27 (corresponding to the “axial moving member” of the present invention). Has been. The rotation-linear motion conversion mechanism 22 is a mechanism that converts the rotational movement of the nut member 26 around the axis to the linear movement of the screw shaft member 27 in the axial direction.

  The pinion 25 is a spur gear or a helical gear, is fixed to the rotating shaft 21 a of the motor 21, and is rotatably accommodated in the case 24. The nut member 26 is provided with a helical 26a that can be engaged with the pinion 25 on the outer periphery, and a screw hole 26b that can be screwed with the thread 27a of the screw shaft member 27 on the inner periphery. The screw shaft member 27 is provided with a screw thread 27a that can be screwed into the screw hole 26b of the nut member 26 on the outer periphery. The screw shaft member 27 is rotatably supported in the case 24 via a bearing (not shown), and the nut member 26 is rotatably supported in the case 24 by being screwed to the screw shaft member 27. .

  Two end chamfers 27b and 27b (see FIG. 5) having a smaller width than the width between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13 are formed at one end portion (left end side in FIG. 6) of the screw shaft member 27. ing. The two chamfers 27b and 27b of the screw shaft member 27 are fitted between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13 in order to restrict the rotation of the screw shaft member 27 around the axis and allow the movement in the axial direction. It is.

  The motion transmission member 23 is formed in a substantially rectangular parallelepiped shape, that is, a so-called bowl shape, having one surface formed on a circumferential surface 23a having a convex shape. The movement transmitting member 23 is integrated with one end of the screw shaft member 27 so that the center axis L3 of the circumferential surface 23a is parallel to the rotation axis L1 of the rotation support portion 13a of the parking lever 13. Provided (see FIG. 5). The motion transmission member 23 is a member that transmits the motion transmission force due to the linear motion of the screw shaft member 27 in the axial direction to the parking lever 13, and the circumferential surface 23 a of the motion transmission member 23 is formed by the bent portion 13 b of the parking lever 13. It is in contact with the side surface 13d on the brake shoe 11a side.

  As shown in FIG. 1, FIG. 3, FIG. 4 and FIG. 7, the anchor block 17 has a shape in which both end portions protrude in opposite directions by press forming a rectangular plate-shaped member, that is, a substantially S-shaped side shape. (Refer to FIG. 4). One end portion of the anchor block 17 protruding is formed as a fixing portion 17 a that is fixed to the bottom portion 152 b of the second recess 152 a of the back plate 15 via the bolt 28. The other end portion of the anchor block 17 protruding is formed as an anchor portion 17b that supports one end portions 112a and 112b of the pair of brake shoes 11a and 11b. And the intermediate part which connects the both ends of the anchor block 17 is formed as the connection part 17c with which the case 24 of the drive part 20 is mounted | worn.

  The anchor portion 17b is provided with a notch portion 171b that allows the case 24 of the drive unit 20 attached to the connecting portion 17c to be inserted and allows the case 24 of the drive unit 20 to be attached or detached. The cutout portion 171b is formed so as to leave a rectangular shape between both side portions 172b and 173b while leaving both side portions 172b and 173b of the rectangular anchor portion 17b. One end portions 112a and 112b of the pair of brake shoes 11a and 11b are supported on both side portions 172b and 173b of the anchor portion 17b.

  A mounting portion 171c that detachably mounts the case 24 of the driving unit 20 with a bolt is provided on the coupling portion 17c. The mounting portion 171c is integrally bent when the anchor block 17 is press-molded. The mounting portion 171c may be manufactured separately from the anchor block 17, and may be welded or bolted to the connecting portion 17c.

  Next, the operation of the electric parking brake device 1 will be described. The electric parking brake device 1 is generally mounted on a rear wheel of a vehicle. The driver's seat of the vehicle is provided with a parking brake switch for operating both electric parking brake devices 1 and 1 respectively. When applying the parking brake, the passenger pushes the parking brake switch in the ON direction. Then, the motor 21 rotates, and this rotational motion is transmitted to the nut member 26 via the pinion 25. The transmitted rotational motion is converted by the screw shaft member 27 into a linear motion in the right direction in FIG. As a result, the parking lever 13 rotates counterclockwise in FIG.

  At this time, the fixing portion 17a of the anchor block 17 is fixed to the bottom portion 152b of the second concave portion 152a, which is a shallower recess than the first concave portion 151a, via the bolt 28. Therefore, compared with the case where the fixing portion 17a of the anchor block 17 is fixed to the bottom portion 151b of the first concave portion 151a via the bolt 28, the distance between the fixing portion 17a and the rotation-linear motion conversion mechanism 22 of the driving unit 20 is increased. It is possible to reduce the moment of force when driving the driving unit 20 applied to the fixing unit 17a. Therefore, it is possible to improve the safety in terms of the strength of the bottom 152b of the second recess 152a of the back plate 15 to which the fixing portion 17a of the anchor block 17 is fixed.

  The parking lever 13 pushes the brake shoe 11a toward the brake drum 16 with the one end 112a supported on the side portion 172b of the anchor portion 17b of the anchor block 17 as a fulcrum, and brakes via the connecting member 14 The shoe 11b is pushed toward the brake drum 16 with the one end 112b supported on the side portion 173b of the anchor portion 17b of the anchor block 17 as a fulcrum.

  Then, the brake linings 12 a and 12 b are frictionally engaged with the inner periphery of the brake drum 16. Thus, the parking brake is applied. At this time, the motor 21 is stopped when a certain current or more flows through the motor 21. Thereby, a constant parking brake force can always be obtained. On the other hand, when releasing the parking brake, the passenger pushes the parking brake switch in the off direction. Then, the motor 21 rotates in the direction opposite to the previous direction, and the parking brake is released. At this time, the motor 21 is turned off when no-load current is reached. Thereby, useless energy consumption can be suppressed.

  According to the electric parking brake device 1 configured as described above, the following operational effects can be obtained. The anchor block 17 is formed of a plate-like member having both end portions protruding in opposite directions, that is, a plate-like member having a substantially S-shaped side surface. Thereby, a space can be secured between both end portions. Therefore, this space can be used as an installation space for the drive unit 20. That is, the fixing portion 17a for fixing one end portion of the anchor block 17 to the back plate 15, the anchor portion 17b for supporting the brake shoes 11a and 11b at the other end portion, and the driving portion 20 at the intermediate portion for connecting both end portions are mounted. The connecting portion 17c can be formed. As a result, the anchor block 17 and the drive unit 20 are arranged so as to overlap with the rotation axis R direction of the brake drum 16 which has a margin compared to the arrangement space in the direction perpendicular to the rotation axis R direction of the brake drum 16. . Therefore, the drive part 20 excellent in the mountability in the brake drum 16 can be comprised.

  Further, by fixing the drive unit 20 to the back plate 15 via the anchor block 17, the drive unit 20 is protected by the back plate 15, and the waterproofness and dustproofness of the drive unit 20 can be improved. . In addition, since the anchor block 17 and the case 24 of the drive unit 20 can be configured by separate members, it is possible to select a necessary material for each function of the anchor block 17 and the case 24 of the drive unit 20, Weight reduction and cost reduction can be achieved.

  In addition, the anchor portion 17b is provided with a notch portion 171b that allows the case 24 of the driving portion 20 supported by the connecting portion 17c to be inserted. Thereby, the operator can perform the operation | work which attaches / detaches the drive part 20 with respect to the connection part 17c through the notch part 171b. Therefore, the drive part 20 excellent in the assembly | attachment property to the inside of the brake drum 16 can be comprised.

  Moreover, the 1st recessed part 151a which accommodates the case 24 etc. of the drive part 20 is formed by denting the backplate 15 to the vehicle side. Thereby, the arrangement space of the drive part 20 can be expanded, and it becomes possible to mount the drive part 20 of various magnitude | size which exhibits the output according to a vehicle weight inside the brake drum 16. FIG. Moreover, the 2nd recessed part 152a which fixes the fixing | fixed part 17a of the anchor block 17 is formed by denting the backplate 15 to the vehicle side by a dent shallower than the 1st recessed part 151a. Thereby, compared with the case where the fixing part 17a is fixed to the first recess 151a, the distance between the fixing part 17a and the driving part 20 is reduced, and the moment of the driving force of the driving part 20 applied to the fixing part 17a is reduced. Can be small. Therefore, the safety | security in the surface of the strength of the backplate 15 by fixing the fixing | fixed part 17c of the anchor block 17 can be improved.

  In addition, since the mounting portion 171c that detachably mounts the case 24 of the driving unit 20 protrudes from the connecting portion 17c, the driving unit 20 can be easily fixed to the mounting unit 171c. Moreover, since the anchor block 17 in which the mounting portions 171c are integrated is formed by press-molding the plate-like member, the manufacturing cost of the anchor block 17 can be reduced.

  Further, one surface of the motion transmitting member 23 that contacts the side surface 13d of the parking lever 13 on the brake shoe 11a side is formed on a circumferential surface 23a. Thereby, the shift | offset | difference of a movement when the parking lever 13 rotates centering on the rotation support part 13a by the linear motion of the screw shaft member 27 can be suppressed. Therefore, it is possible to prevent the motion transmission force by the motion transmission member 23 from becoming an unbalanced load, and the parking lever 13 can be smoothly rotated.

  Further, the screw shaft member 27 penetrates the other end of the parking lever 13 so as to be relatively movable in the axial direction with the relative rotation being restricted, and the motion transmission member 23 is integrally provided at the tip of the screw shaft member 27. It has been. That is, in the screw shaft member 27, the two chamfers 27b and 27b are fitted between the opposing surfaces 13c and 13c of the bent portion 13b of the parking lever 13, and the rotation of the screw shaft member 27 around the axis is restricted and the axial movement is prevented. Is allowed. The motion transmission member 23 is integrally provided at the tip of the screw shaft member 27. For this reason, the rotational motion of the nut member 26 can be reliably converted into the linear motion of the screw shaft member 27.

  In the above-described embodiment, the anchor block 17 is provided with the mounting portion 171c for detachably mounting the case 24 of the driving unit 20 with a bolt. However, the anchor block 17 is not provided with the mounting portion 171c. It is good also as a structure which attaches the case 24 of the drive part 20 so that attachment or detachment is possible with a volt | bolt.

  In addition, the convex circumferential surface 23a is formed on the contact surface of the motion transmission member 23 with the side surface 13d of the parking lever 13, but the convex surface of the contact surface of the side surface 13d of the parking lever 13 with the motion transmission member 23 is convex. Even if the circumferential surface is formed, the same effect can be obtained. Further, a convex circumferential surface is formed on one of the contact surfaces of the motion transmitting member 23 and the side surface 13d of the parking lever 13, and a concave shape having the same diameter or a large diameter as the diameter of the convex circumferential surface. Even if the circumferential surface is formed, the same effect can be obtained. Further, the present invention is not limited to the circumferential surface, and the same effect can be obtained by forming a curved surface such as a spherical surface.

  Further, the rotation-linear motion conversion mechanism 22 is a mechanism that converts the rotational motion of the nut member 26 around the axis line into the linear motion of the screw shaft member 27 in the axial direction. It is good also as a mechanism converted into the linear motion of the nut member 26 in the direction of an axis. In the case of this mechanism, for example, the motion transmission member 23 is integrally provided at the tip of a member formed to protrude from the nut member 26 in the axial direction. Further, a rack and pinion mechanism may be used as the rotation-linear motion conversion mechanism 22.

  DESCRIPTION OF SYMBOLS 1 ... Electric parking brake device, 10 ... Drum brake, 11a, 11b ... Brake shoe, 12a, 12b ... Brake lining, 13 ... Parking lever, 14 ... Connecting member, 15 * ..Back plate, 151a ... first recess, 152a ... second recess, 152b ... bottom of second recess, 16 ... brake drum, 17 ... anchor block, 17a ... fixed Part, 17b ... anchor part, 171b ... notch part, 17c ... connecting part, 171c ... mounting part, 20 ... drive part, 21 ... motor, 22 ... rotation- Linear motion conversion mechanism, 23 ... motion transmission member, 24 ... case, 26 ... nut member, 27 ... screw shaft member.

Claims (6)

A back plate (15) whose outer surface (15d) is fixed to the mounting portion on the vehicle body side;
Brake linings (12a, 12b) that can be frictionally engaged with a brake drum (16) that is disposed on the inner surface (15c) side of the back plate (15) and is rotatable about the rotation axis (R), respectively. A pair of brake shoes (11a, 11b) rotatably supported on the back plate (15);
An anchor block (17) provided with a fixing part (17a) fixed to the back plate (15) and an anchor part (17b) supporting one end of the pair of brake shoes (11a, 11b);
One of the brake shoes (11a) is rotatably supported at one end, and a connecting member (14) is inserted between the other brake shoe (11b), and the pair of brake shoes is rotated. (11a, 11b) is expanded toward the brake drum (16) with one end supported by the anchor block (17) as a fulcrum, and the pair of brake linings (12a, 12b) are expanded to the brake drum (16). A parking lever (13) for frictional engagement with
A rotating member (26) and an axially moving member (27) that are fitted to each other are supported by a case (24) via a conversion mechanism (22) that converts rotational motion into linear motion, and the axially moving member (27) is The rotation is restricted and connected to the other end of the parking lever (13), and the rotating member (26) is rotationally driven by the motor (21), whereby the axially moving member (27) is axially moved to move the parking lever. An electric parking brake device (1) having a drive unit (20) for rotating (13);
The anchor block (17) is formed of a plate-like member having both end portions projecting in opposite directions, and one end portion of the both end portions extends in a direction perpendicular to the rotation axis (R) and the fixing portion (17a). ), The other end portion forms the anchor portion (17b), and the intermediate portion connecting the both end portions is formed as a connecting portion (17c) to which the driving portion (20) is mounted. . In claim 1,
The anchor portion (17b) is provided with a notch portion (171b) that allows insertion of at least a part of the drive portion (20) in order to attach and detach the drive portion (20) to and from the coupling portion (17c). Electric parking brake device. In claim 1 or 2,
The back plate (15) is provided with a first recess (151a) that is recessed toward the outer surface (15d) and a second recess (152a) that is shallower than the first recess (151a) and is recessed toward the outer surface (15d). And
At least a part of the driving part (20) mounted on the connecting part (17c) is accommodated in the first recess (151a), and the fixing part (17a) is provided in the second recess (152a). Electric parking brake device fixed to the bottom (152b). In any one of Claims 1 thru | or 3,
An electric parking brake device in which a mounting portion (171c) for detachably mounting a case (24) of the driving portion (20) is provided protruding from the connecting portion (17c). In any one of Claims 1 thru | or 3,
The anchor block (17) is an electric parking brake device formed by press-molding the plate-like member. In claim 5,
An electric parking brake device in which a mounting portion (171c) for detachably mounting a case (24) of the drive portion (20) is integrally protruded from the connecting portion (17c) by press molding.

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