JP2008240874A - Disk brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost by shortening and miniaturizing the axial length of a reduction mechanism in a disk brake for a vehicle, in which the reduction mechanism to decelerate the rotation power of an electric motor has an elliptical cam connected to a motor shaft of the electric motor relatively non-rotatably. <P>SOLUTION: An end at the reduction mechanism 45 side of the motor shaft 60 is rotatably supported in a case 68 to store the reduction mechanism 45 via a ball bearing 64. A connecting hole 151 to fit and to be penetrated by the motor shaft 60 relatively non-rotatably is formed in the elliptical cam 141 having the other end brought in contact with the inner ring of the ball bearing 64. A stopper member 152 is attached to the motor shaft 60 engaged with the elliptical cam 141 from the opposite side to the ball bearing 64. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes an electric motor having a motor case attached to a caliper body, an elliptical cam that is non-rotatably connected to a motor shaft of the electric motor, and reduces the rotational power of the electric motor. The present invention relates to a vehicular disc brake including a speed reduction mechanism disposed coaxially with a motor, and a motion conversion mechanism that converts rotational power of the speed reduction mechanism into an axial advance / retreat operation force so that a friction pad can be pressed toward the disc rotor.

Such a vehicle disc brake is known from Patent Document 1, in which a motor shaft is fitted into an elliptical cam of a speed reduction mechanism, which is a wave gear mechanism, such that the motor shaft is not relatively rotatable. One end of the inner ring of the ball bearing interposed between the side rotating members is brought into contact with the elliptical cam, and the other end of the outer ring of the ball bearing is brought into contact with the output side rotating member, so that the motor shaft The axial relative movement of the elliptical cam is restricted.
JP 2007-40459 A

  However, as disclosed in Patent Document 1 described above, in order to restrict the axial relative movement of the elliptical cam with respect to the motor shaft and to support the output-side rotating member so as to be relatively rotatable with the motor shaft, In a structure in which a ball bearing is interposed between the motor shafts, it is necessary to secure a space for arranging the ball bearing in the axial direction, which not only increases the axial length of the speed reduction mechanism, but also increases the cost. Will also be connected.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicular disc brake that can be reduced in size while reducing the axial length of the speed reduction mechanism and reducing the cost. .

  In order to achieve the above object, an invention according to claim 1 includes an electric motor having a motor case attached to a caliper body, and an elliptical cam that is connected to a motor shaft of the electric motor so as not to be relatively rotatable. A reduction mechanism that is arranged coaxially with the electric motor so as to reduce the rotational power of the motor, and converts the rotational power of the reduction mechanism into an axial advance / retreat operating force so that the friction pad can be pressed toward the disk rotor. In the disc brake for a vehicle including a motion conversion mechanism, an end portion of the motor shaft on the speed reduction mechanism side is rotatably supported by a case accommodating the speed reduction mechanism via another ball bearing, and one end of the motor brake is supported on the other end. The elliptical cam that is brought into contact with the inner ring of the ball bearing is provided with a connecting hole for fitting and penetrating the motor shaft so as not to be relatively rotatable. Serial to other ball bearings, characterized in that the stop member which engages the opposite side of the elliptical cam is mounted on the motor shaft.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the speed reduction mechanism includes a wave generator in which a ball bearing is mounted on the outer periphery of the elliptical cam, and a plurality of teeth on the outer periphery. An elastic ring gear mounted on the outer ring of the ball bearing, a fixed-side ring gear having teeth on the inner periphery thereof meshing with one half of the teeth in the axial direction of the elastic ring gear, and the other axial direction of the elastic ring gear It is a wave gear mechanism having an output side ring gear having teeth on the inner periphery thereof meshing with the half teeth, and an output side rotating member coupled to the output side ring gear.

  In addition, the push nut 152 of an Example respond | corresponds to the stop member of this invention.

  According to the first or second aspect of the invention, the elliptical cam rotates together with the motor shaft by fitting the motor shaft to the elliptical cam so as not to rotate relative to the elliptical cam, and the elliptical cam with respect to the motor shaft. The relative movement in the axial direction is restricted by a case housing the speed reduction mechanism and a ball bearing interposed between the motor shafts and a stop member attached to the motor shaft. Since a stop member is used in place of the ball bearing interposed between the output side rotating member and the elliptical cam for the purpose of regulation, the cost can be reduced, and the axial length required for the stop member is short. Therefore, the axial length of the speed reduction mechanism can be shortened to reduce the size.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 18 show an embodiment of the present invention, FIG. 1 is a perspective view of a vehicle disc brake, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a sectional view taken along line 4-4 of FIG. 2, FIG. 5 is a sectional view taken along arrow 5 of FIG. 1, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. 6 is a perspective view of the motor cover, FIG. 9 is a perspective view of the 9-9 line of FIG. 6 with the caliper body omitted, and FIG. 10 is an arrow 10 of FIG. FIG. 11 is a view of the brush holder viewed from the same direction as FIG. 7 with the motor cover omitted, and FIG. 12 is a view of the brush holder viewed from the same direction as FIG. 11 with the brush and sensor cover omitted. FIG. 13 is a view seen from the same direction as FIG. 11 for showing the embedded state of the lead frame in the brush holder, and FIG. 14 is an electric motor. FIG. 15 is an enlarged sectional view taken along line 15-15 in FIG. 11, FIG. 16 is a sectional view taken along line 16-16 in FIG. 15, FIG. 17 is a perspective view of the sensor cover, and FIG. It is sectional drawing which expands and shows a deceleration mechanism.

  First, in FIGS. 1 to 3, this vehicle disc brake can obtain a service brake state by hydraulic pressure and can obtain a parking brake state by operation of the electric motor 25 (see FIG. 2). A pair of frictions disposed between the disk rotor 26 and the caliper body 27 so as to be opposed to both side surfaces of the disk rotor 26, the caliper body 27, and the disk rotor 26 rotating together with the wheel of the wheel (not shown). Pads 28 and 29 are provided.

  The caliper body 27 is supported by a bracket 30 attached to the vehicle body side so as to be slidable in a direction along the axis of the disc rotor 26, and extends from the housing portion 27a across the disc rotor 26 to the opposite side. The slide pins 31, 31 are provided on the bracket 30 so as to be slidable and extend parallel to the axis of the disk rotor 26, and are slidably supported on the bracket 30. Boots 32 are provided between the housing portion 27 a and the bracket 30.

  The friction pad 28 facing one side surface of the disk rotor 26 on the housing portion 27a side is formed by providing a lining 22 on the back metal 20 that can slide and come into contact with the disk rotor 26, and the disk rotor on the arm portion 27b side. A friction pad 29 facing the other side of the disk 26 is provided with a lining 23 on the back metal 21 that can be brought into sliding contact with the disk rotor 26 to exert a frictional force. Both the friction pads 28 and 29 are along the axis of the disk rotor 26. It can be moved in the direction and is held by the bracket 30.

  The housing portion 27a of the caliper body 27 includes a cylinder hole 33 having an axis parallel to the axis of the disk rotor 26 and opening to the friction pad 28 side, and an accommodation recess opening to the opposite side of the friction pad 28. 34 and a partition wall 35 interposed between the cylinder hole 33 and the accommodating recess 34 are provided. The cylinder hole 33 and the accommodating recess 34 are formed so as to have a circular cross section on the same axis, and a through hole 36 that coaxially connects the cylinder hole 33 and the accommodating recess 34 is provided at the center of the partition wall 35. .

  A hydraulic chamber 37 is formed in the cylinder hole 33 between the partition wall 35 and a bottomed cylindrical brake piston 38 whose front end is closed so that its front end abuts against the back metal 20 of the friction pad 28. The front end of the brake piston 38 is engaged with the back metal 20 in order to prevent rotation in the cylinder hole 33.

  An annular piston seal 40 interposed between the caliper body 27 and the brake piston 38 is attached to the inner surface of the cylinder hole 33, and an annular dust boot 41 is provided between the opening end of the cylinder hole 33 and the brake piston 38. The housing part 27a is provided with a hydraulic pressure path 42 for guiding the hydraulic pressure to the hydraulic pressure chamber 37.

  By the way, the brake piston 38 receives the output of the electric motor 25 that exerts the power to move the friction pads 28 and 29 forward and backward with respect to the disk rotor 26 via the speed reduction mechanism 45 and the motion conversion mechanism 46 that reduce the output. The motion conversion mechanism 46 is accommodated in the cylinder hole 33 of the caliper body 27 so as to be disposed behind the brake piston 38, and the speed reduction mechanism 45 is supported by the electric motor 25. Most of it is housed in the housing recess 34, and the electric motor 25 is attached to the housing portion 27 a of the caliper body 27 on the side opposite to the disk rotor 26.

  The motion conversion mechanism 46 is engaged with a rotary shaft 47 coaxial with the cylinder hole 33 and engaged with the brake piston 38 so that relative rotation is impossible, and is screwed with a male screw 48 engraved on the outer periphery of the front end side of the rotary shaft 47. Nut 49. One end portion of the rotating shaft 47 on the side opposite to the brake piston 38 rotatably passes through the through hole 36 of the partition wall 35 and has a radius so as to face the surface of the partition wall 35 facing the hydraulic chamber 37. A flange portion 47 a projecting outward in the direction is provided integrally with the rotating shaft 47. Thus, an O-ring 50 is interposed between the partition wall 35 and the rotating shaft 47 of the housing portion 27a, and a thrust bearing 51 and a washer 52 are provided between the surface of the partition wall 35 facing the hydraulic chamber 37 and the flange portion 47a. Is installed.

  The sliding surface of the thrust bearing 51 with respect to the washer 52 is coated with a resin, whereby a sealing effect is generated between the thrust bearing 51 and the washer 52, and the load pressure by the O-ring 50 can be reduced. . As a result, the durability (wear resistance) of the O-ring 50 can be improved.

  A retaining ring 53 is mounted on the outer periphery of the protruding portion of the rotating shaft 47 on the housing recess 34 side, and a disc spring 54 is interposed between the partition wall 35 and the retaining ring 53 of the caliper body 27. The rotating shaft 47 is urged toward the electric motor 25 by the elastic force exerted by the disc spring 54, and the elastic force exerted by the disc spring 54 is applied to the hydraulic pressure chamber 37. It is set to be equal to or greater than the thrust force acting on the rotating shaft 47 toward the opposite side of the electric motor 25 by rollback generated in the O-ring 50 when the hydraulic pressure is released after the pressure is applied.

  Referring also to FIG. 4, the rotating shaft 47 is screwed into a nut 49 that surrounds the rotating shaft 47 in the brake piston 38. The nut 49 has an engagement portion 49 a having a regular square outer periphery at the front end, and the front end surface of the engagement portion 49 a abuts on the front end inner surface of the brake piston 38.

  On the other hand, on the inner periphery of the brake piston 38 having a bottomed cylindrical shape, the engaging grooves 55... Are integral multiples (twice in this embodiment) of the number of the four corners of the engaging portion 49a. The corners are selectively engaged at a plurality of positions whose phases are shifted to each other, and are provided at equal intervals in the circumferential direction while extending in the axial direction. That is, the inner periphery of the brake piston 38 is formed to have a shape corresponding to the outer peripheral shape of the engaging portion 49a and a plurality of regular polygons whose phases are shifted from each other. In this embodiment, the phase is 45. It is formed in a star shape with two regular squares that are offset.

  In such a motion conversion mechanism 46, when the power from the electric motor 25 is decelerated by the speed reduction mechanism 45 and the power that rotates in one direction is transmitted to the rotation shaft 47, the rotation power of the rotation shaft 47 is converted to the brake piston 38. In the state where the rotation of the nut 49 is blocked, the brake piston 38 is converted into an axial forward / backward operating force, and the disc rotor 26 is moved from both sides by the friction pads 28 and 29 by the action and the reaction caused by the brake piston 38 sliding forward. Thus, the braking force is obtained. Further, when the rotary shaft 47 is rotated in the other direction, the brake piston 38 slides rearward in the axial direction to release the braking state.

  Referring to FIG. 5 and FIG. 6 together, the motor case 56 of the electric motor 25 has an end wall 57a at one end and a flange portion 57b projecting outward in the radial direction at the other end. Synthetic resin having a yoke 57 formed into a bottomed cylindrical shape (in this embodiment, a bottomed cylindrical shape) by a material having a center hole 77 so that the outer periphery is in contact with the flange portion 57b of the yoke 57 And a cover plate 59 that sandwiches the brush holder 58 between the other end of the yoke 57, that is, an opening end. The brush holder 58 includes an opening of the yoke 57. A short cylindrical portion 58b fitted to the end is integrally provided.

  A motor shaft 60 penetrating the center hole 77 of the brush holder 58 is rotatably supported by the motor case 56, and the motor shaft 60 is provided with an armature 62 having a commutator 61. Thus, one end of the motor shaft 60 passes through a cylindrical first bearing housing 65 provided on an end wall 57a of one end of the yoke 57 in the motor case 56 so as to be rotatable. A first ball bearing 63 is interposed between the shafts 60, and the other end side of the motor shaft 60 is rotatable about a cylindrical second bearing housing 66 provided at the center of the lid plate 59 in the motor case 56. A second ball bearing 64 with a seal is interposed between the second bearing housing 66 and the motor shaft 60. That is, one end of the motor shaft 60 is rotatably supported by one end of the yoke 57 via the first ball bearing 63, and the other end of the motor shaft 60 is rotatably supported by the lid plate 59 via the second ball bearing 64. Is done. A plurality of magnets 67 are fixed to the inner periphery of the yoke 57 at a portion corresponding to the armature 62.

  The speed reduction mechanism 45 is accommodated in a case 68, and the case 68 has a cover plate 59 constituting a part of the motor case 56 and an outer periphery of the cover plate 59 opposite to the electric motor 25. A case member 69 that has a flange portion 69a that abuts from the side at the opening end and is formed in a cup shape. The electric motor 25 has a plurality of locations at equal intervals in the circumferential direction of the motor case 56. In the embodiment, the three parts are attached to the caliper body 27 with bolts 70 that are fastened to the caliper body 27.

  Referring also to FIG. 7, there are insertion holes 71 through which the bolts 70 are inserted at a plurality of positions at equal intervals in the circumferential direction of the flange portion 57 b in the motor case 56, in this embodiment three positions. In the outer peripheral portion of the cover plate 59 and the flange portion 69a of the case member 69, insertion holes 72, 73,... Corresponding to the insertion holes 71, are provided. Further, cylindrical collars 74 made of metal for inserting the bolts 70 are attached to both ends of the yoke holders at portions corresponding to the insertion holes 71, 72, 73,. It is embedded so as to abut on the flange portion 57 b of 57 and the cover plate 59. Thus, the bolts 70 are arranged so that their enlarged diameter heads 70a abut against and engage with the flange portion 57b, the insertion holes 71, the collars 74, and the insertion holes 72, 73,. And is screwed into screw holes 75 provided in the housing portion 27a of the caliper body 27. In addition, engagement recesses 76 having a non-circular cross-sectional shape for engaging a tool (not shown) to rotate the bolts 70 are provided on the outer end surfaces of the bolts 70.

  Referring also to FIG. 8, at least a part of the motor case 56, in this embodiment, a part of the yoke 57 and the brush holder 58 is covered with a motor cover 80 made of synthetic resin. Reference numeral 80 denotes a bottomed cylindrical portion 80a that coaxially covers the yoke 57, and a flange portion 80b that projects outward from the opening end of the bottomed cylindrical portion 80a so as to closely overlap the flange portion 57b of the yoke 57. And a short cylindrical portion 80c that is connected to the outer peripheral edge of the flange portion 80b at a right angle and covers a part of the brush holder 58 coaxially.

  The flange portion 80b of the motor cover 80 is integrally provided with a base end portion of a plurality of, for example, three connecting leg portions 81 through the motor case 56 and the case 68. Moreover, in the case 68, the connecting leg portion 81 penetrating the flange portion 69a of the case member 69 is engaged and fixed to the flange portion 69a of the case member 69. In this embodiment, an eccentric small diameter is provided. A shaft portion 81a is integrally provided at the distal end of the connecting leg portion 81, and as shown in FIG. 9, push nuts 82 that contact and engage with the flange portion 69a are mounted on the small diameter shaft portion 81a. It should be noted that the distal ends of the connecting leg portions 81 may be engaged and fixed to the flange portion 69a of the case member 69 by heat caulking.

  The motor cover 80 has its flange portion 80b in close contact with the flange portion 57b of the yoke 57 in the motor case 56 on the entire circumference around the enlarged diameter head portion 70a of the bolt 70. The portion 80b is integrally provided with a cylindrical portion 83 that allows the bolts 70 to be inserted and surrounds the enlarged head portions 70a of the bolts 70, respectively.

  Moreover, caps 84 made of an elastic material such as rubber and liquid-tightly closing the tip portions of the tube portions 83 are detachably attached to the tip portions of the tube portions 83. It is fitted to the part. In addition, the cap 84 is integrally provided with a knob portion 84a located outside the cylindrical portion 83 in a state in which the cap 84 is fitted to the cylindrical portion 83. The knob portion 84a applies force. In a non-natural state, it is formed in a shape that sandwiches the distal end portion of the cylindrical portion 83 from the outside.

  In FIG. 10, a rectangular cross-sectional shape that is long in the direction along the axis of the electric motor 25 is formed between the opposed surfaces of the brush holder 58 constituting a part of the motor case 56 and the housing portion 27 a of the caliper body 27. The annular sealing member 86 having the annular sealing member 86 is interposed while being restricted from bending to either the inner side or the outer side. Thus, in this embodiment, the seal member 86 surrounds the outer periphery of the case 68 that houses the speed reduction mechanism 45, and the seal member 86 is bent inward by the outer periphery of the case 68. It is regulated.

  In addition, the opposing surfaces of the caliper body 27 and the brush holder 58 have annular surfaces having restricting surfaces 87a and 88a facing the seal member 86 from the inside and the outside, in this embodiment, from the outside. The restricting portions 87 and 88 are protruded so as to extend to the sides close to each other, and the restricting surfaces 87a and 88a are separated from the seal member 86 toward the front end side of the restricting portions 87 and 88. It is formed as a tapered surface inclined so as to be separated.

  In FIG. 11, a plurality of, for example, four brushes 90, 90... Slidably in contact with the commutator 61 included in the armature 62 are disposed in the brush holder 58 at positions at equal intervals in the circumferential direction of the commutator 61. The brushes 90, 90... Are urged by springs 91, 91... To the side in sliding contact with the commutator 61.

  A positive-side internal to which positive-side power supply lines 92 and 93 connected to two brushes 90 and 90 arranged at intervals of 90 degrees among the four brushes 90 and 90... Are connected to the brush holder 58. A feeding terminal 96 and a minus-side internal feeding terminal 97 for connecting minus-side feeding lines 94 and 95 connected to the remaining brushes 90 and 90, respectively, are arranged adjacent to each other. The brush holder 58 is provided with a rotation angle detection sensor 98 for detecting the rotation angle of the electric motor 25. The rotation angle detection sensor 98 is connected to the plus side and the minus side internal power supply with respect to the armature 62. The brush holder 58 is disposed on the opposite side to the terminals 96 and 97.

  12 and 13, the brush holder 58 is embedded so that the first to fifth lead frames 99, 100, 101, 102, 103 made of conductive metal are mold-coupled when the brush holder 58 is molded. Is done. Thus, the first and second lead frames 99 and 100 form the positive and negative external power supply terminals 104 and 105 at one end and the positive and negative internal power supply terminals 96 and 97 at the other end. It is embedded in the brush holder 58 as formed. The third and fourth lead frames 101 and 102 form sensor positive and negative external terminals 106 and 107 at one end, and sensor positive and negative internal terminals 108 and 109 at the other end. Thus, the rotation angle is applied to the sensor positive side and negative side internal terminals 108 and 109 facing the opening 110 provided in the brush holder 58 at a portion corresponding to the rotation angle detection sensor 98. A detection sensor 98 is connected.

  By the way, the brush holder 58 is integrally formed with a coupler portion 58a projecting to the side thereof, and the positive and negative external power supply terminals 104 and 105, and the sensor positive and negative external terminals 106. , 107 are arranged in the coupler part 58a. Thus, as shown in FIG. 14, the plus side external power supply line 111 and the minus side external power supply line 112 are connected to the plus side and minus side external power supply terminals 104 and 105 of the coupler unit 58a. A sensor positive side external conductor 113 and a sensor negative side external conductor 114 are connected to the sensor positive side and negative side external terminals 106 and 107 of 58a.

  A battery 116 is connected to the electronic control unit 115 that controls the operation of the electric motor 25, and the positive external power supply line 111, the negative external power supply line 112, the sensor positive external conductive line 113, and the sensor. The negative external conductor 114 is connected to the electronic control unit 115.

  Incidentally, the yoke 57 is electrically connected to the vehicle body B in the electric motor 25 separately from the positive and negative external power supply terminals 104 and 105 and the sensor positive and negative external terminals 106 and 107. The noise countermeasure terminal 117 is provided at one end of the fifth lead frame 103, and is connected to the positive external power supply terminal 104, the negative external power supply terminal 105, and the like. Along with the sensor positive external terminal 106 and the sensor negative external terminal 107, the sensor is disposed in the coupler portion 58 a.

  Referring to FIG. 6, the brush holder 58 is provided with a receiving hole 118 for allowing a part of the fifth lead frame 103 to face, and a coil spring 119 made of a conductive metal material has a fifth end at the fifth end. The lead frame 103 is abutted and the other end is accommodated in the accommodating hole 118 so as to abut on the flange portion 57 b of the yoke 57. That is, the noise countermeasure terminal 117 is electrically connected to the yoke 57 via the fifth lead frame 103 and the coil spring 119. In addition, as shown in FIG. 14, the ground wire 120 connected to the vehicle body B is connected to the noise countermeasure terminal 117.

  15 and 16, the rotation angle detection sensor 98 has a Hall IC 122 attached to one end of a pair of conductive plates 121 parallel to each other, and a capacitor 123 provided between intermediate portions of the conductive plates 121. A magnet 124 is attached to the brush holder 58 at a position close to the Hall IC 122, and a pulsar 125 (see FIGS. 2 and 6) to be detected by the rotation angle detection sensor 98 is located inside the Hall IC 122. The motor shaft 60 is provided in the motor case 56 so as to be positioned.

  A mounting recess 126 located between the center hole 77 and the opening 110 and closer to the center hole 77 in the brush holder 58 at a portion located on the outer side of the pulsar 125 provided on the motor shaft 60, The Hall IC 122 is accommodated in the mounting recess 126 so as to open to the opposite side of the cover plate 59. The conductive plates 121 are bent at substantially right angles so that the Hall IC 122 on one end side is accommodated in the mounting recess 126 and the other end is extended to the side opposite to the pulsar 125. In the opening 110 of the brush holder 58, the other ends of the conductive plates 121 are electrically connected to the sensor positive side and negative side internal terminals 108 and 109, respectively.

  The Hall IC 122 and the capacitor 123 accommodated in the mounting recess 126 outside the pulsar 125 are held by a brush holder 58 of the motor case 56 and a sensor cover 127 that is detachably attached to the brush holder 58. The

  In FIG. 17, the sensor cover 127 includes a first sandwiching plate portion 127 a and a first sandwiching plate portion that sandwich the conductive plates 121, in which the Hall IC 122 is accommodated in the mounting recess 126, between the brush holder 58. The first and second side plate portions 127b and 127c are connected to both sides of the 127 at a right angle, and the second holding plate portion 127e is connected to the first side plate portion 127b via a hinge portion 127d. An engaging claw 129 that can elastically engage with a locking recess 128 provided on the inner surface of the second side plate portion 127c protrudes from the tip of the second clamping plate portion 127e.

  The brush holder 58 is provided with insertion holes 130 and 130 having a rectangular shape on both sides of a portion where the conductive plates 121 are disposed between the mounting recess 126 and the opening 110. The first side plate portion 127b and the second sandwiching plate portion 127e that are not bent by the hinge portion 127d are inserted into the hole 130, and the second side plate portion 127c is inserted into the other insertion hole 130.

  The second sandwiching plate portion 127e that is inserted through the one insertion hole 130 and protrudes toward the lid plate 59 is bent at a right angle by the hinge portion 127d, and the second side plate portion 127c inserted through the other insertion hole 130 is locked. The engaging claw 129 is elastically engaged with the recess 128, whereby the sensor cover 127 is detachably attached to the brush holder 58 and the Hall IC 122 is held between the sensor cover 127 and the brush holder 58. Moreover, the concave portions 131 and 132 corresponding to each other are provided on the opposing surfaces of the second sandwiching plate portion 127e and the brush holder 58, and the magnet 124 is fitted to the concave portions 131 and 132 so that the magnet 124 is second. It is held between the sandwiching plate portion 127e and the brush holder 58.

  The first clamping plate portion 127a is formed so as to cover the opening 110 from the side opposite to the lid plate 59, and within the opening 110, the two conductive plates 121. Since the minus side internal terminals 108 and 109 are connected, the sensor cover 127 covers the connecting portion of the sensor plus side and the minus side internal terminals 108 and 109 to the Hall IC 122.

  As clearly shown in FIGS. 1, 5, 7, 9, and 11 to 13, the brush holder 58 includes a flange portion 57 b of the yoke 57 and an outer periphery of the housing portion 27 a in the caliper body 27. A pair of projecting portions 135, 135 projecting in the direction are integrally projected so that a finger can be put on when removing the electric motor 25 from the caliper body 27, and both projecting portions 135. The brush holder 58 is integrally provided so as to protrude outward on the opposite side to the protruding coupler portion 58a.

  By the way, cylindrical collars 74 made of metal for inserting bolts 70 for fastening the motor case 56 to the housing part 27a of the caliper body 27 are disposed at positions spaced at equal intervals in the circumferential direction of the brush holder 58. The protrusions 135, 135 are embedded in the brush holder 58 so as to sandwich one of the collars 74, in this embodiment, the collar 74 located on the opposite side of the coupler portion 58a from both sides in the circumferential direction. Is projected.

  In addition, concave portions 136 are formed at a plurality of locations (three locations) on the outer periphery of the brush holder 58 corresponding to the portions where the respective collars 74 are embedded, and a plurality of concave portions 136 are disposed in the concave portions 136. Ribs 137... Are integrally provided.

  The coupler portion 58a is formed integrally with the brush holder 58 so that a part thereof protrudes to the housing portion 27a side of the caliper body 27. The housing portion 27a of the caliper body 27 includes As will be clearly shown, when the motor case 56 is to be attached to the caliper body 27 in a state where the circumferential relative position of the motor case 56 to the caliper body 27 is shifted from the normal position, the motor case 56 interferes with the coupler portion 58a. Two pairs of protrusions 138, 138; 139, 139 are provided as a pair.

  That is, since the motor case 56 is fastened to the caliper body 27 by the bolts 70 at three positions equally spaced in the circumferential direction, the motor case 56 is rotated by 180 degrees with respect to the caliper body 27. The bolts 70 should be able to be attached to the caliper body 27. However, since the coupler portion 58a protrudes laterally from the brush holder 58, the position of the coupler portion 58a around the wheel axis is required to be constant, and the motor case 56 includes the coupler portion 58a. Is required to be attached to the caliper body 27 in a state where the circumferential relative position with respect to the caliper body 27 is in a normal position so that the wheel is at a correct position around the axis of the wheel.

  Moreover, the projections 138, 138 of one set are projected from the caliper body 27 so as to be paired at positions symmetrical with respect to the diameter line L of the cylinder hole 33 provided in the caliper body 27, and the other set. The projections 139 and 139 are paired at a position that is symmetric with respect to the diameter line of the cylinder hole 33, in this embodiment, at a position that is symmetric with respect to the diameter line L on the opposite side of the projection 138. The caliper body 27 is projected.

  Thus, assuming that the state in which the coupler portion 58a is disposed at the position indicated by the solid line in FIG. 5 is the state in which the circumferential relative position of the motor case 56 to the caliper body 27 is the normal position on one of the left and right wheels. When the circumferential relative position of the motor case 56 to the caliper body 27 is shifted from the normal position so that the coupler portion 58a is in the position indicated by the chain line, one of the projections 138. When one of the projections 139... Of the pair interferes with the coupler portion 58a, the motor case 56 cannot be fastened to the caliper body 27.

  In the other wheel on the left and right, when the circumferential relative position of the motor case 56 with respect to the caliper body 27 is shifted from the normal position, the other of the one set of protrusions 138. The other of 139... Interferes with the coupler portion 58a, so that the motor case 56 cannot be fastened to the caliper body 27.

  In FIG. 18, the speed reduction mechanism 45 includes a cover plate 59 that constitutes a part of the motor case 56, and a cup-shaped case member that abuts a flange portion 69 a on the outer periphery of the cover plate 59 from the side opposite to the electric motor 25. 69 is housed in a case 68, and an annular seal member 140 is interposed between the cover plate 59 and the case member 69.

  The speed reduction mechanism 45 is a wave gear mechanism, and includes a wave generator 143 in which a third ball bearing 142 is mounted on the outer periphery of an elliptical cam 141 connected to the motor shaft 60 of the electric motor 25 so as not to rotate relative thereto. Are provided on the outer ring of the third ball bearing 142, and are fixed to the case 68, and on one half of the teeth 145 in the axial direction of the elastic ring gear 144. A stationary ring gear 146 having teeth 147 to be meshed with each other on the inner periphery, an output side ring gear 148 having teeth 149 to be meshed with the other half teeth 145 of the elastic ring gear 144 on the inner periphery, and the output An output side rotation member 150 coupled to the side ring gear 148 is included in the case 68. Moreover, the number of teeth of the inner peripheral teeth 147 of the fixed side ring gear 146 is the same as the number of teeth of the outer peripheral teeth 145 of the elastic ring gear 144, and the number of teeth of the inner peripheral teeth 149 of the output side ring gear 148 is elastic. Two more than the number of teeth on the outer periphery of the ring gear 144 are set.

  By the way, the end of the motor shaft 60 on the speed reduction mechanism 45 side is inserted into the case 68 so as to be supported by the second bearing housing 66 of the cover plate 59 of the case 68 via the second ball bearing 64. The elliptical cam 141 having one end abutted against the inner ring of the second ball bearing 64 is provided with a connecting hole 151 for fitting the fitting shaft portion 60a provided at the end portion of the motor shaft 60. In order to prevent relative rotation of the elliptical cam 141 with respect to the motor shaft 60, the fitting shaft portion 60a and the connection hole 151 are formed to have a non-circular cross-sectional shape.

  The motor shaft 60 is coaxially provided with a small-diameter shaft portion 60b that protrudes from the elliptical cam 141 toward the output-side rotation member 150. The small-diameter shaft portion 60b includes the second ball bearing 64 and A push nut 152, which is a stop member that contacts and engages with the elliptical cam 141 from the opposite side, is mounted. That is, the axial movement of the elliptical cam 141 relative to the motor shaft 60 is restricted by the second ball bearing 64 and the push nut 152.

  The lid plate 59 is provided with a positioning portion for coaxially positioning at least one stationary member constituting a part of the speed reduction mechanism 45, in this embodiment, the stationary ring gear 146 with respect to the second ball bearing 64. In this embodiment, there is a fitting recess 153 as a positioning portion that is coaxial with the cylindrical second bearing housing 66 provided on the lid plate 59 so as to fit the outer ring of the second ball bearing 64. The fixed-side ring gear 146 is provided on the cover plate 59 so as to fit the outer periphery thereof, and the fixed-side ring gear 146 fitted in the fitting recess 153 is fixed to the cover plate 59 with a plurality of bolts 154. Is done.

  The output side ring gear 148 is fastened to the output side rotating member 150 by a plurality of bolts 155. The output-side rotating member 150 is rotatably supported by a cylindrical third bearing housing 156 provided at the center of the case member 69 in the case 68 via a fourth ball bearing 157. In this output side rotation member 150, a connection fitting portion 47a provided with a non-circular cross-sectional shape at the end of the rotation shaft 47 of the motion conversion mechanism 46 on the speed reduction mechanism 45 side is made relatively non-rotatable. A coupling recess 158 to be fitted is provided. Thus, the output side rotation member 150 is connected to the rotation shaft 47 so as not to be relatively rotatable, and the rotational power decelerated by the reduction mechanism 45 is transmitted to the rotation shaft 47.

  Next, the operation of this embodiment will be described. The caliper body 27 has a cylinder hole 33 in which the brake piston 38 is slidably fitted, and a partition wall 35 that forms a hydraulic chamber 37 between the brake piston 38. Are provided in the partition wall 35 so as to allow the rotation shaft 47 constituting a part of the motion conversion mechanism 46 to freely rotate, and the surface of the partition wall 35 facing the hydraulic chamber 37 and the rotation shaft 47. A thrust bearing 51 is interposed therebetween, and an O-ring 50 is interposed between the inner periphery of the through-hole 36 and the outer periphery of the rotary shaft 47, and at the time of releasing the hydraulic pressure after the hydraulic action to the hydraulic pressure chamber 37. A thrust force on the opposite side of the electric motor 25 acts on the rotary shaft 47 due to the rollback generated in the O-ring 50, but the disc spring 54 that exerts a resilient force greater than the thrust force is rotated. And the shaft 47 so as to bias the electric motor 25 side is interposed between the partition wall 35 and the rotary shaft 47 of the caliper body 27.

  Therefore, even if a rollback occurs in the O-ring 50 after the hydraulic pressure in the hydraulic pressure chamber 37 is released and a thrust force is applied to the rotary shaft 47 in the direction opposite to the electric motor 25, the rotary shaft 47 moves in the axial direction. Therefore, a gap is prevented from being generated on the sliding surface of the thrust bearing 51, and smooth rotation of the rotary shaft 47 is guaranteed.

  At least a part of the motor case 56 of the electric motor 25 is covered with a synthetic resin motor cover 80 having a flange portion 80b that contacts the motor case 56 from the side opposite to the case 68 that houses the speed reduction mechanism 45. The motor cover 80 is integrally provided with base ends of a plurality of connecting leg portions 81 penetrating the motor case 56 and the case 68, and the tip end portions of the connecting leg portions 81. The flange portion 69a is engaged and fixed.

  Accordingly, in a state where the speed reducing mechanism 45 is connected to the electric motor 25 and the motor case 56 is in contact with the case 68 of the speed reducing mechanism 45, a plurality of flanges 80 b of the motor cover 80 are in contact with the motor case 56. The connecting legs 81 pass through the motor case 56 and the case 68, and the tips of the connecting legs 81 are engaged with and fixed to the case 68, so that the motor cover 80, the electric motor 25, and the speed reduction mechanism 45 are engaged. The motor cover 80, the electric motor 25, and the speed reduction mechanism 45 can be assembled to the caliper body 27 by fastening the motor case 56 of the electric motor 25 to the caliper body 27. Compared to the case where the motor cover, electric motor, and speed reduction mechanism are individually assembled to the caliper body. As well as reduce the number of components, it is possible to enhance the resistance assembly with less assembly steps. Moreover, the motor case 56 and the case 68 of the speed reduction mechanism 45 are combed in the axial direction by the connecting leg portions 81, thereby facilitating coaxial management of the motor cover 80, the electric motor 25, and the speed reduction mechanism 45.

  A motor case is attached to the caliper body 27 by a plurality of bolts 70 having an enlarged head portion 70a that contacts and engages with the motor case 56, and covers at least a part of the motor case 56. The bolts 70 can be inserted into the motor cover 80 that is in close contact with the motor case 56 around the enlarged diameter heads 70a, and surround the enlarged diameter heads 70a of the bolts 70, respectively. Since the cylindrical portions 83 are provided and caps 84 made of an elastic material and liquid-tightly closing the distal ends of the cylindrical portions 83 are detachably fitted to the distal ends of the cylindrical portions 83. The enlarged diameter heads 70a of the bolts 70 are liquid-tightly covered with the motor cover 80 and the cap 84, so that the enlarged diameter heads 70a can be prevented from being rusted. Insertion holes 71 ... provided in Takesu 56, 72 ..., even if 73 ... and bolts 70 ... misalignment can be reliably sealing between the bolts 70 ... and the motor case 56.

  The caps 84 are integrally provided with knobs 84a positioned outside the cylinders 83 in a state where the caps 84 are fitted to the cylinders 83, so that the knobs 84a are pinched. The cap 84 can be easily detached from the cylindrical portion 83 by pulling with a, so that the maintenance work is facilitated.

  In addition, since the knob portion 84a is formed in such a shape that the tip portion of the cylinder portion 83 is sandwiched from the outside, the knob portion 84a can be easily grasped and the knob portion can be provided even when the cap 84 is fitted to the cylinder portion 83. The appearance of 84a can be improved.

  By the way, an annular sealing member 86 having a rectangular cross section that is long in the direction along the axis of the electric motor 25 is interposed between the opposing surfaces of the caliper body 27 and the motor case 56. The space between the caliper body 27 and the motor case 56 can be sealed so as to absorb the dimensional error and the assembling error of the distance between the 56 facing surfaces.

  In addition, the seal member 86 is interposed between the facing surfaces of the caliper body 27 and the motor case 56 while being restricted from bending inwardly, and the restricting surfaces 87a and 88a facing the seal member 86 from the outside are provided. The annular restricting portions 87 and 88 are provided so as to extend to the opposing surfaces of the caliper body 27 and the motor case 56 so as to extend toward the sides close to each other, and both restricting surfaces 87a and 88a are formed on the restricting portions 87 and 88a. Since it is formed as a tapered surface that is inclined so as to move away from the seal member 86 toward the tip end side of 88, when the seal member 86 is deformed to protrude outward, it is in contact with the restriction surfaces 87a, 88a. Therefore, it is possible to prevent deterioration of the sealing performance.

  The brush holder 58 provided in the electric motor 25 holds a plurality of brushes 90 slidably in contact with the commutator 61 included in the armature 62 provided on the motor shaft 60, and the plus side and the minus side connected to the brushes 90, respectively. The brush holder 58 includes positive and negative internal power supply terminals 96 and 97 that connect the side power supply lines 92 and 93; 94 and 95, and a rotation angle detection sensor 98 that detects the rotation angle of the electric motor 25. However, since the rotation angle detection sensor 98 is disposed on the brush holder 58 on the opposite side of the plus side and minus side internal power supply terminals 96 and 97 with respect to the armature 62, the plus side and minus side connected to each brush 90. The rotation angle detection sensor 98 does not interfere with the side power supply lines 92, 93; 94, 95. In this way, the positive and negative internal power supply terminals 96 and 97 can be easily connected, and the rotation angle detection sensor 98 can be placed in a wide space where the positive and negative internal power supply terminals 96 and 97 are not provided. It is possible to easily assemble, and it is easy to connect the plus side and minus side feed lines 92, 93; 94, 95 to the plus side and minus side internal feed terminals 96, 97, and the rotation angle detection sensor. Assembling property to 98 brush holders 58 can be improved.

  The electric motor 25 includes positive and negative external power supply terminals 104 and 105 connected to the brush 90..., And sensor positive and negative external terminals 106 and 105 connected to the rotation angle detection sensor 98. In addition to 107, a noise countermeasure terminal 117 is provided for electrically connecting a yoke 57 constituting a part of the motor case 56 to the vehicle body B. The yoke 57 of the motor case 56 is electrically connected to the vehicle body B. With a simple configuration that is simply connected and grounded, the yoke 57 exhibits a shielding effect, and generation of radio noise can be suppressed.

  In addition, a lead frame 103 that forms a noise countermeasure terminal 117 at one end is embedded in a brush holder 58 made of synthetic resin, and a part of the lead frame 103 faces to a receiving hole 118 provided in the brush holder 58. Since the coil spring 119 having conductivity is accommodated so that one end thereof is brought into contact with the lead frame 103 and the other end is brought into contact with the yoke 57, welding or the like is performed when the yoke 57 and the brush holder 58 are assembled. Thus, the electrical connection between the yoke 57 and the noise countermeasure terminal 117 can be ensured.

  Further, the brush holder 58 includes a coupler portion 58a in which the positive and negative external power supply terminals 104 and 105, the sensor positive and negative external terminals 106 and 107, and the noise countermeasure terminal 117 are arranged in common. Since they are provided integrally, the positive and negative external power supply terminals 104 and 105 are electrically connected to the positive and negative external power supply lines 111 and 112, and the sensor positive and negative external terminals 106 and 107 are connected to the sensor. The electrical connection of the positive and negative external conductors 112 and 113 and the electrical connection of the noise countermeasure terminal 117 to the vehicle body B can be performed simultaneously, facilitating electrical connection work.

  The Hall IC 122 provided in the rotation angle detection sensor 98 is disposed in the electric motor 25 so as to be located on the outer side of the pulsar 125 provided on the motor shaft 60, the motor case 56 of the electric motor 25, and the motor case 56. The sensor cover 127 is made of a synthetic resin that is detachably attached to the motor, and the Hall IC 122 is disposed in the electric motor 25, so that a special waterproof seal measure for the Hall IC 122 is not required. Since only the sensor cover 127 is necessary for attaching the IC 122 to the motor case 56, the number of parts can be reduced.

  In addition, the Hall IC 122 is held by the brush holder 58 and the sensor cover 127 that constitute a part of the motor case 56, and the connection part of the sensor positive side and negative side internal terminals 108 and 109 to the Hall IC 122 is the sensor cover 127. Since it is covered, the abrasion powder generated by the sliding contact of the brush 90... Held by the brush holder 58 with the commutator 61 is applied to the connecting portion of the sensor positive side and negative side internal terminals 108 and 109 to the Hall IC 122. It is possible to prevent an electrical short circuit from occurring due to an influence.

  In addition, since the magnet 124 arranged close to the Hall IC 122 is held between the brush holder 58 and the sensor cover 127, a dedicated component for arranging the magnet 124 on the brush holder 58 side is unnecessary, and the number of components is reduced. Can be reduced.

  By the way, a yoke 57 constituting a part of the motor case 56 is formed in a bottomed cylindrical shape having a flange portion 57b projecting outward in the radial direction at the opening end, and the flange portion 57b of the yoke 57 and the flange portion 57b and the outer peripheral portion of the brush holder 58 sandwiched between the caliper body 27 and the caliper body 27 are fastened to the caliper body 27 at a plurality of fastening points in the circumferential direction, for example, three places. Projections 135... Projecting outward from the outer periphery of the housing part 27 a in the caliper body 27 are integrally projected so that a finger can be applied when the electric motor 25 is removed from the caliper body 27. Therefore, when the electric motor 25 is removed from the caliper body 27, it is only necessary to apply a force toward the opposite side of the caliper body 27 by placing a finger on the protrusions 135 provided integrally with the brush holder 58. Since the brush holder 58 is sandwiched between the yoke 57 and the caliper body 27, the electric motor 25 can be detached from the caliper body 27 so that the brush holder 58 is not detached from the yoke 57.

  Further, since the protrusions 135 project outwardly on the side opposite to the coupler part 58a provided integrally with the brush holder 58, the coupler part 58a is used to put a finger on the protrusions 135. Thus, the electric motor 25 can be easily detached from the caliper body 27.

  Further, cylindrical collars 74 made of metal through which the bolts 70 are inserted are respectively embedded in the brush holder 58 at a plurality of fastening points by the bolts 70, and one of the collars 74 is sandwiched from both sides in the circumferential direction. Thus, since the pair of protrusions 135 are integrally projected on the brush holder 58, when the electric motor 25 is removed from the caliper body 27, the force applied to the brush holder 58 can be distributed to two locations. Moreover, since the metal collar 74 is embedded in the brush holder 58 at a position sandwiched between the two protrusions 135, the brush holder 58 can be reinforced with the collar 74 in response to the force applied to the protrusions 135. .

  In addition, a plurality of recesses 136 are formed at a plurality of locations including both the protrusions 135 on the outer periphery of the brush holder 58 corresponding to the portion where the collars 74 are embedded, and a plurality of recesses 136 are arranged in the recesses 136. Since the ribs 137 are integrally provided, it is possible to avoid the occurrence of shrinkage due to the presence of the collars 74 when the brush holder 58 is molded by embedding the collars 74. It is easy for a finger to enter the recess 136 between the two protrusions 135 when placing a finger on the protrusion 135, and there is a possibility that a force in the removal direction is applied only to the yoke 57 side by the finger entering the recess 136. However, since the plurality of ribs 137 are arranged in the recesses 136, it is possible to prevent the fingers from entering the recesses 136, and the fingers are applied only to the projections 135, so that the brush holder can be surely secured. It can be removed 8 each electric motor 25 from the caliper body 27.

  When the motor case 56 in which the circumferential relative position of the motor case 56 with respect to the caliper body 27 is shifted from the normal position is to be attached to the caliper body 27, the brush holder 58 is attached to the housing portion 27a of the caliper body 27. Projections 138... 139 interfering with the coupler portion 58a projecting outward from the outer side of the motor case 56. Therefore, when the circumferential relative position of the motor case 56 with respect to the caliper body 27 deviates from the normal position, Since the projections 138, 139, ... interfere with the coupler portion 58a projecting from the outer periphery, it is possible that an error occurs when the relative position of the coupler portion 58a with respect to the caliper body 27 is always set to the normal position. It can be surely prevented. That is, since the motor case 56 is fastened to the caliper body 27 at a plurality of fastening points set at equal intervals in the circumferential direction of the cylinder hole 33, the motor to the caliper body 27 is attached when the motor case 56 is attached to the caliper body 27. The mounting posture of the case 56 can be changed by the number of fastening points. However, when the circumferential relative position of the motor case 56 with respect to the caliper body 27 is deviated from the normal position, the protrusion 138 that interferes with the coupler portion 58a. , 139 can reliably prevent erroneous assembly.

  In addition, the projections 138..., 139... Project from the caliper body 27 so as to be paired at positions symmetrical with respect to the diameter line L of the cylinder hole 33, so that the caliper body 27 and the electric motor 25 are connected to the left and right wheels. It is not necessary to make a mold for molding the caliper body 27 separately for each of the left and right wheels, and the cost can be reduced.

  A speed reduction mechanism 45 arranged coaxially with the electric motor 25 so as to reduce the rotational power of the electric motor 25 is thirdly arranged on the outer periphery of an elliptical cam 141 connected to the motor shaft 60 of the electric motor 25 so as not to be relatively rotatable. A wave generator 143 having a ball bearing 142 mounted thereon, an elastic ring gear 144 having a plurality of teeth 145 provided on the outer periphery and mounted on the outer ring of the third ball bearing 142, and one axial direction of the elastic ring gear 144 The stationary ring gear 146 that has teeth 147 that mesh with the half teeth 145 on the inner periphery, and the output side that has teeth 149 that mesh with the other half teeth 145 of the elastic ring gear on the inner periphery. A wave gear mechanism having a ring gear 148 and an output side rotating member 150 coupled to the output side ring gear 148, and a speed reduction mechanism 45 of the motor shaft 60. The end of this is supported by a lid plate 59 of a case 68 that houses the speed reduction mechanism 45 via a second ball bearing 64 so as to be rotatable, and an end of an oval cam 141 that abuts the inner ring of the second ball bearing 64. Is provided with a connecting hole 151 through which the motor shaft 60 is fitted and penetrated in a relatively non-rotatable manner, and a push nut 152 that engages with the elliptical cam 141 from the side opposite to the second ball bearing 64 is attached to the motor shaft 60. Is done.

  Accordingly, the elliptical cam 141 rotates together with the motor shaft 60 when the motor shaft 60 is fitted so as not to be relatively rotatable, and the relative movement in the axial direction of the elliptical cam 141 with respect to the motor shaft 60 is reduced. The second ball bearing 64 interposed between the cover plate 59 of the case 68 and the motor shaft 60 and the push nut 152 attached to the motor shaft 60. Since the push nut 152 is used in place of the ball bearing interposed between the output side rotation member 150 and the elliptical cam 141 in order to restrict the axial movement, the cost can be reduced, and the push nut 152 is necessary. Therefore, the axial length of the speed reduction mechanism 45 can be shortened and the size can be reduced.

  By the way, the motor case 56 has an end wall 57a that rotatably supports one end of the motor shaft 60 via a first ball bearing 63 at one end, and a yoke 57 formed in a bottomed cylindrical shape, and a second ball. The motor shaft 60 is rotatably supported on the other end side of the motor shaft 60 via a bearing 64 and has a lid plate 59 attached to the other end side of the yoke 57. A fitting recess 153 for positioning the fixed ring gear 146 coaxially with respect to the second ball bearing 64 by fitting the stationary ring gear 146, which is one stationary member, is provided in the cover plate 59. Since the fixed ring gear 146 that has been positioned is fixed to the lid plate 59, the reduction mechanism 45 can be assembled to the electric motor 25 side while increasing the coaxiality. It is possible to easily manage the shaft and increase the degree of coaxiality to prevent the generation of operation noise. Further, since the cover plate 59 can be shared as a part of the case 68 of the speed reduction mechanism 45, the speed reduction mechanism 45 and the electric motor 25 are used. It is possible to reduce the size by reducing the axial length at the time of connection.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a perspective view of a disk brake for vehicles. It is sectional drawing which follows the 2-2 line of FIG. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 1. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6 with the motor cover omitted. It is a perspective view of a motor cover. It is a 9-9 line arrow directional view of Drawing 6 in the state where a caliper body was omitted. FIG. 10 is an enlarged view of a portion indicated by an arrow 10 in FIG. 2. It is the figure which looked at the brush holder from the same direction as Drawing 7 in the state where a motor cover was omitted. It is the figure which looked at the brush holder from the same direction as Drawing 11 in the state where a brush and a sensor cover were omitted. It is the figure seen from the same direction as FIG. 11 for showing the embedding state of the lead frame in a brush holder. It is a figure which shows the electrical connection state of an electric motor. It is a 15-15 line expanded sectional view of FIG. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 15. It is a perspective view of a sensor cover. It is sectional drawing which expands and shows the deceleration mechanism of FIG.

Explanation of symbols

25 ... Electric motor 26 ... Disc rotor 27 ... Caliper bodies 28, 29 ... Friction pad 45 ... Deceleration mechanism 46 ... Motion conversion mechanism 56 ... Motor case 60 ... Motor Shaft 64, 142 ... Ball bearing 68 ... Case 141 ... Elliptical cam 143 ... Wave generator 144 ... Elastic ring gears 145, 147, 149 ... Teeth 146 ... Fixed side ring gear 148... Output side ring gear 150... Output side rotating member 151... Connection hole 152.

Claims (2)

  The motor case (56) has an electric motor (25) attached to the caliper body (27), and an elliptical cam (141) connected to the motor shaft (60) of the electric motor (25) so as not to be relatively rotatable. The speed reduction mechanism (45) arranged coaxially with the electric motor (25) so as to reduce the rotational power of the electric motor (25), and the friction pads (28, 29) are pressed toward the disk rotor (26). In a vehicle disc brake comprising a motion conversion mechanism (46) for converting the rotational power of the speed reduction mechanism (45) into an axial advance / retreat operating force to enable the speed reduction mechanism (45) of the motor shaft (60). The end on the side is rotatably supported by a case (68) that accommodates the speed reduction mechanism (45) via another ball bearing (64), and one end of the other ball bearing. 64) is provided with a connecting hole (151) for fitting and penetrating the motor shaft (60) in a relatively non-rotatable manner. The other ball bearing (64) The vehicle disc brake is characterized in that a stop member (152) engaged with the elliptical cam (141) is mounted on the motor shaft (60) from the opposite side to the motor shaft (60).   The speed reduction mechanism (45) includes a wave generator (143) in which a ball bearing (142) is mounted on the outer periphery of the elliptical cam (141), and a plurality of teeth (145) on the outer periphery. An elastic ring gear (144) mounted on the outer ring of the bearing (142), and a fixed side ring gear having teeth (147) meshing with teeth (145) on one half of the axial direction of the elastic ring gear (144) on the inner circumference (146), an output side ring gear (148) having teeth (149) meshing with teeth (145) of the other half in the axial direction of the elastic ring gear (144), and the output side ring gear (148) The disc brake for a vehicle according to claim 1, wherein the disc brake is a wave gear mechanism having an output side rotating member (150) coupled to the vehicle.

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