JP5292338B2 - Electric brake device for vehicle - Google Patents

Abstract

Disclosed is an electric brake device for a vehicle, wherein a motion conversion mechanism and a reducer comprised of first and second planetary gear mechanisms are provided between a disk brake and an electric motor. A speed reduction chamber (59) for containing a reducer (23A) is defined between a motor case (83) to which a caliper body (26) is attached and the caliper body (26). A ring gear (64) common to first and second planetary gear mechanisms (61, 62A) is inserted into the speed reduction chamber (59), and is prevented from moving in the axial direction by the motor case (83) and the caliper body (26). The end portion of the ring gear (64), which is opposite to an electric motor (22A), is engaged in the caliper body (26). Thus, the number of components for affixing the ring gear common to the first and second planetary gear mechanisms can be reduced to a great extent, and the ring gear can be easily assembled.

Description

  The present invention includes a disk brake having a friction pad opposed to a side surface of a disk rotor, an electric motor, and a rotation shaft, and a motion conversion for moving the friction pad forward and backward with respect to the disk rotor according to the rotation of the rotation shaft. The present invention relates to an electric brake device for a vehicle including a mechanism and a reduction gear provided between the electric motor and the rotating shaft, which includes a first and second planetary gear mechanisms.

  An electric disc brake for a vehicle in which a two-stage planetary gear type speed reducer is interposed between an electric motor and a screw mechanism connected to a brake piston is already known from Patent Document 1, A two-stage planetary gear type speed reducer housed in a gear case includes a first sun gear provided on a motor shaft, a ring gear rotatably supported on a housing, and a first planetary gear meshing with the ring gear and the first sun gear. A first planetary gear mechanism including a first carrier that is rotatably supported and fixed to the gear case, a second sun gear provided on the input shaft, and the ring gear that is common to the first planetary gear mechanism And a second planetary gear mechanism that rotatably supports a second planetary gear that meshes with the ring gear and the second sun gear. And coaxially to the screw axis of the screw mechanism so as to be relatively non-rotatably coupled.

JP 2006-183723 A

  By the way, in the two-stage planetary gear type speed reducer disclosed in Patent Document 1, a ring gear common to the first and second planetary gear mechanisms is rotatably supported by a gear case, and is compared between the ring gear and the gear case. A pair of ball bearings having a large diameter is interposed, which not only increases the number of parts, but also increases the size of the gear case.

  In order to solve such a problem, it is conceivable to fix a ring gear common to the first and second planetary gear mechanisms to the gear case. In this case, the number of parts for fixing the ring gear is reduced as much as possible. It is desirable to facilitate the assembly of the ring gear.

  The present invention has been made in view of such circumstances, and a vehicle in which the number of parts for fixing a ring gear provided in common to the first and second planetary gear mechanisms is reduced as much as possible and the assembly of the ring gear is facilitated. An object of the present invention is to provide an electric brake device for a vehicle.

In order to achieve the above object, the present invention has a disc brake having a friction pad opposed to a side surface of a disc rotor, an electric motor, a rotating shaft, and the friction pad is attached to the disc according to the rotation of the rotating shaft. In the electric brake device for a vehicle, comprising: a motion conversion mechanism for moving forward and backward with respect to the rotor; and a reduction gear provided between the electric motor and the rotation shaft, the first planetary gear mechanism including first and second planetary gear mechanisms. The gear mechanism includes a first sun gear provided on the motor shaft of the electric motor, a ring gear, and a first carrier that rotatably supports the first planetary gear meshing with the ring gear and the first sun gear, The planetary gear mechanism includes a second sun gear that rotates together with the first carrier, the ring gear that is common to the first planetary gear mechanism, and the ring gear. And a second carrier that rotatably supports the second planetary gear meshing with the second sun gear and that is coaxially connected to the rotating shaft and is relatively non-rotatable, and the motor case of the electric motor includes the speed reducer A deceleration chamber for housing the disc brake is formed between the caliper body and the caliper body of the disc brake, and the ring gear is prevented from axial movement by the motor case and the caliper body. wherein is inserted into the speed reduction chamber, a plurality of bottomed pin support hole being provided on at the caliper body of the partition walls constituting the inner wall of the speed reduction chamber, the end opposite to the electric motor of the ring gear, said plurality A plurality of engagement slits corresponding to the pin support holes are provided, and a plurality of engagement pins extending parallel to the axis of the ring gear are provided in the plurality of pin support holes. One end portion of the are respectively inserted, said the plurality of engaging slits other end portion of the plurality of engagement pins are inserted respectively, pivoting about the axis of the ring gear is restricted, the first and second In order to absorb the axial deviation of the planetary gear mechanism 2, the width of each engagement slit along the circumferential direction of the ring gear and the outer diameter of each engagement pin are within the plane perpendicular to the axis of the speed reducer. The first feature is that the ring gear is set to allow displacement within a limited range .

Furthermore, in addition to the configuration of the first feature, the present invention further includes an accommodation recess that is closed by the motor case in the caliper body so as to constitute a part of the deceleration chamber. A second feature is that an annular seal member having a larger diameter than the inner periphery of the accommodating recess is interposed between the caliper bodies.

  The screw mechanism 24 of the embodiment corresponds to the motion conversion mechanism of the present invention, and the screw shaft 45 of the embodiment corresponds to the rotating shaft of the present invention.

  According to the first aspect of the present invention, the ring gear common to the first and second planetary gear mechanisms is substantially fixed to the caliper body, so that the bearing member is interposed between the ring gear and the caliper body. Therefore, the number of parts and the size of the caliper body can be reduced accordingly.

Also, pin support hole of the plurality of bottom is provided in the partition wall of the caliper body which constitute the inner wall of the speed reduction chamber, a plurality of engagement corresponding to these pin support hole in the end portion opposite to the electric motor of the ring gear A mating slit is provided, and one end of each of the plurality of engaging pins extending in parallel with the axis of the ring gear is inserted into each pin support hole, and the other end of each engaging pin is inserted into each engaging slit. is rotated about the axis of the ring gear is restricted Te Runode, engaging only in the engagement slit ring gear to be able to reduce the number of parts for substantially fixing the caliper body, also inserts the ring gear to the speed reduction chamber Since the mating pin is inserted, the ring gear can be easily assembled. In addition, the ring gear can move in a plane perpendicular to the axis by the gap generated between the engagement slit and the engagement pin, and the axial deviation of the first and second planetary gear mechanisms can be absorbed. Smooth rotation power transmission in the machine becomes possible.

Further, according to the second feature of the present invention, the housing recess provided in the caliper body so that the annular seal member interposed between the motor case and the caliper body constitutes a part of the deceleration chamber. Since it has a larger diameter than the inner circumference of the motor, it is possible to prevent water and the like from entering the speed reduction chamber and the motor case with a minimum number of seal members.

It is a longitudinal cross-sectional view of the electric brake device for vehicles of Example 1. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 1. It is a disassembled perspective view of a reduction gear. FIG. 6 is an enlarged view of a portion indicated by an arrow 6 in FIG. 2. It is sectional drawing which shows the engagement state of the 12 angle | corner socket to an output member. It is the front view which looked at the brush holder from the motor chamber side. It is the rear view which looked at the brush holder from the reduction gear side. It is the front view which expanded the principal part of FIG. 8 in order to show a capacitor | condenser holding | maintenance part. It is a perspective view of a capacitor | condenser holding | maintenance part. It is a principal part enlarged view of FIG. It is sectional drawing corresponding to FIG. 12 in the coupler part vicinity. It is a longitudinal cross-sectional view of the electric brake device for vehicles of Example 2. It is a principal part side view of the electric brake device for vehicles. FIG. 15 is an enlarged view of a portion indicated by an arrow 16 in FIG. 14. It is a disassembled perspective view of a reduction gear. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. 15.

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

  A first embodiment of the present invention will be described with reference to FIG. 1 to FIG. 13. First, in FIG. A rotary electric motor 22A, a speed reducer 23A coupled to the electric motor 22A, a rotational piston output from the speed reducer 23A, and a brake piston 38 of the disc brake 21A and the like. And a screw mechanism 24 which is a motion conversion mechanism provided between the speed reducers 23A.

  The disc brake 21A is capable of obtaining a service brake state by hydraulic pressure, and can be operated by an electric motor 22A to obtain a parking brake state, and is a disc rotor that rotates together with a wheel of a wheel (not shown). 25A, a caliper body 26, and a pair of friction pads 27, 28 disposed opposite to both side surfaces of the disk rotor 25A and disposed between the disk rotor 25A and the caliper body 26.

  Referring also to FIG. 2, the caliper body 26 includes a housing portion 26a supported by a bracket 29 attached to the vehicle body side so as to be slidable in a direction along the axis of the disc rotor 25A, and a housing portion 26a. And an arm portion 26b extending to the opposite side across the disk rotor 25A.

  The friction pad 27 facing the one side surface of the disk rotor 25A on the housing portion 26a side of the caliper body 26 is formed by providing a lining 30 on the back metal 32 that can slide and come into contact with the disk rotor 25A. The friction pad 28 facing the other side surface of the disc rotor 25A on the arm portion 26b side of the body 26 is formed by providing a lining 31 on the back metal 33 that can slide and come into contact with the disc rotor 25A. , 28 can be moved in the direction along the axis of the disk rotor 25A and is held by the bracket 29.

  The caliper body 26 has a housing portion 26a having a cylinder hole 34 having an axis parallel to the axis of the disc rotor 25A and opening to the friction pad 27 side, and an accommodation recess opening to the opposite side of the friction pad 27. 35 and a partition wall 36 interposed between the cylinder hole 34 and the accommodating recess 35 is provided. The cylinder hole 34 and the accommodating recess 35 are formed so as to have a circular cross section on the same axis, and a through hole 37 that coaxially connects the cylinder hole 34 and the accommodating recess 35 is provided at the center of the partition wall 36. .

  A brake piston 38 that is formed in a cylindrical shape with a bottom closed at the front end and that forms a hydraulic pressure chamber 39 with the partition wall 36 is accommodated in the cylinder hole 34 so as to be axially slidable. The front end contacts the back metal 32 of the friction pad 27 and is engaged with the back metal 32 in order to prevent rotation in the cylinder hole 34.

  An annular piston seal 40 interposed between the caliper body 26 and the brake piston 38 is mounted on the inner surface of the cylinder hole 34, and an annular dust boot 41 is provided between the opening end of the cylinder hole 34 and the brake piston 38. The housing portion 26a is provided with a fluid pressure passage 42 for guiding fluid pressure to the fluid pressure chamber 39.

  The screw mechanism 24 includes a screw shaft 45 that is coaxial with the cylinder hole 34, and a nut 46 that is engaged with the brake piston 38 and cannot be rotated relative to the screw shaft 45. The caliper body 26 is accommodated in the housing portion 26a.

  At the rear end of the screw shaft 45 on the side opposite to the brake piston 38, a connecting shaft portion 45a that rotatably passes through the through hole 37 of the partition wall 36 is coaxially and integrally connected. A flange portion 45b projecting outward in the radial direction so as to face the partition wall 36 is integrally provided, and an O-ring 47 is interposed between the partition wall 36 and the connecting shaft portion 45a.

  Referring also to FIG. 3, the screw shaft 45 is screwed into a nut 46 surrounding the screw shaft 45 in the brake piston 38. The nut 46 includes a cylindrical portion 46a (see FIG. 1) that coaxially surrounds the screw shaft 45, an engaging portion 46b projecting radially outward from the front end of the cylindrical portion 46a, and the engaging portion 46b. An abutment protrusion 46c that protrudes forward from the center of the front end and abuts against the inner surface of the front end of the brake piston 38 is integrally formed, and a screw hole 48 for screwing the screw shaft 45 is an axial total length of the nut 46. Provided.

  The outer periphery of the engaging portion 46b is formed in a petal shape having protrusions 49, 49,... Arranged at a plurality of locations, for example, eight locations, equally spaced in the circumferential direction, and has a bottomed cylindrical shape. The cross-sectional shape of the inner periphery of the front part of the brake piston 38 is composed of four flat portions 50 corresponding to the two protrusions 49, 49, and four bent portions 51 connecting the flat portions 50. Are formed in a non-circular shape. As a result, the nut 46 is inserted into the brake piston 38 that is prevented from rotating in the cylinder hole 34 by engaging with the back metal 32, so that the engaging portion 46 b of the nut 46 is relative to the front portion of the brake piston 38. It will be engaged so that it cannot rotate.

  Between the protrusions 49 on the outer periphery of the engaging portion 46b of the nut 46 and between the front inner periphery of the brake piston 38, passages 52 that allow the brake fluid to flow are formed, respectively. Four passage grooves 53 are provided on the front end surface of the abutting protrusion 46c at the front end of the nut 46, extending radially outward from the screw hole 48 and arranged in a cross shape.

  Referring also to FIG. 4, between the flange portion 45b of the screw shaft 45 and the partition wall 36 of the caliper body 26, an O-ring interposed between the sliding bearing 54 and the partition wall 36 and the connecting shaft portion 45a. The washer 55 sandwiched between the sliding bearing 54 and the partition wall 36 is interposed while fulfilling the function as a pressing member that prevents the 47 from being separated, and the sliding bearing 54 and the washer 55 are formed in a flat ring shape.

  A ring-shaped fitting recess 56 is formed on the surface of the flange portion 45b facing the partition wall 36 so that the inner periphery is defined by the outer periphery of the base portion of the connecting shaft portion 45a. Is fitted into the fitting recess 56. Thus, the inner periphery of the fitting recess 56 is continuous with the outer periphery of the base of the connecting shaft 45a via the saddle curved surface 57, and the inner diameter of the sliding bearing 54 avoids contact with the saddle curved surface 57. Thus, it is set larger than the base outer diameter of the connecting shaft 45a.

  In such a screw mechanism 24, when the power from the electric motor 22A is decelerated by the speed reducer 23A and the power rotating in one direction is transmitted to the screw shaft 45, the rotation of the brake piston 38 and the nut 46 is prevented. In this state, the disc rotor 25A is clamped from both sides by the friction pads 27 and 28 due to the action and reaction caused by the brake piston 38 sliding forward in the axial direction, whereby a braking force is obtained. Further, when the screw shaft 45 is rotated in the other direction, the brake piston 38 slides rearward in the axial direction to release the braking state.

  Referring to FIG. 4, the motor case 83 of the electric motor 22 </ b> A is attached to the housing portion 26 a of the caliper body 26 so as to close the opening end of the housing recess 35. In the gear case 60 </ b> A configured by the caliper body 26, a reduction chamber 59 is formed, at least a part of which is formed by the storage recess 35, and the reduction gear 23 </ b> A is stored in the reduction chamber 59.

  In the reduction gear 23A, a first planetary gear mechanism 61 and a second planetary gear mechanism 62A are provided between the motor shaft 95 of the electric motor 22A and the connecting shaft portion 45a of the screw shaft 45 in the screw mechanism 24. It is made up of.

  Referring also to FIG. 5, the first planetary gear mechanism 61 includes a first sun gear 63 provided on the motor shaft 95, a ring gear 64 fixed to the gear case 60A, the ring gear 64 and the first gear. A first carrier 66 rotatably supporting a plurality of, for example, three first planetary gears 65 meshing with the sun gear 63, and the second planetary gear mechanism 62 </ b> A is provided on the inner periphery of the first carrier 66. The second sun gear 67 meshed with the outer periphery, the ring gear 64 common to the first planetary gear mechanism 61, and a plurality of, for example, three second planetary gears 68 meshed with the ring gear 64 and the second sun gear 67. A second carrier 69A that is rotatably supported and a flat ring-shaped output member 70 whose outer periphery is serrated and fitted to the inner periphery of the second carrier 69A.

The ring gear 64 common to the first and second planetary gear mechanisms 61 and 62A is formed in a cylindrical shape having an outer diameter slightly smaller than the inner diameter of the receiving recess 35 and is inserted into the reduction chamber 59. The end of the ring gear 64 opposite to the electric motor 22A is an inner end wall of the accommodating recess 35 in the caliper body 26 in order to restrict the rotation of the ring gear 64 around the axis. That is , the concave and convex engagement is made with the partition wall 36 constituting the inner wall of the deceleration chamber 59 . For this uneven engagement, before Symbol electric and motor 22A engaging slit 71 which is open on the partition wall 36 side in the circumferential direction a plurality of locations for example 3 part of the edge portion of the ring gear 64 opposite ... are respectively provided, A plurality of, for example, three engaging pins 72... Provided in the partition wall 36 and extending in parallel with the axis of the ring gear 64 are inserted into the engaging slits 71. Thus, each of the engagement pins 72 is provided in the partition wall 36 by inserting one end portion into a bottomed pin support hole 73 provided in the partition wall 36 and protrudes from the partition wall 36. The other ends of the pins 72 are inserted into the engagement slits 71.

  Moreover, as clearly shown in FIG. 6, the engagement pin 72 has a width d of the engagement slit 71 along the circumferential direction of the ring gear 64 so that a gap 74 is formed between the ring gear 64 and the engagement pin 72. The outer diameter D is set to be slightly larger than the outer diameter D of the ring gear 64, so that the ring gear 64 is within a limited range until the ring gear 64 comes into contact with the inner peripheral surface of the housing recess 35. The displacement of the ring gear 64 is allowed.

  The first carrier 66 is formed in a flat ring shape, and the outer periphery of the half of the second sun gear 67 on the electric motor 22 </ b> A side having the same cross-sectional shape over the entire axial length is Engaged with the inner periphery, the second sun gear 67 rotates together with the first carrier 66.

  In the first carrier 66, a plurality of, for example, three locations that are equidistant from each other in the circumferential direction on a virtual circle centered on the axis are provided with first support pins 75 that have axes parallel to the first carrier 66. One end is fixed by, for example, press-fitting, and the other end of each first support pin 75 is inserted into a first support hole 76 provided in the first planetary gear 65.

  Moreover, the first planetary gear 65 is opposed to the disk portion 88b of the lid member 88 of the motor case 83 constituting a part of the gear case 60A, but the disk portion 88b of the lid member 88 is opposed to the disk portion 88b. An annular recess 91 formed by bending so that a part thereof is recessed to the side opposite to the speed reducer 23A is formed so as to face the other end of each of the first support pins 75.

  The second planetary gears 68 mesh with the outer periphery of the half of the second sun gear 67 opposite to the electric motor 22A, and the like in the circumferential direction of the second carrier 69A formed in a flat ring shape. A second support hole 78 provided at the center of the second planetary gears 68 is provided at the other end of the second support pins 77 with one end fixed by press-fitting or the like at a plurality of spaced intervals, for example, three locations. Are inserted respectively.

  The end of the connecting shaft 45a that is coaxially and integrally connected to the screw shaft 45 in the screw mechanism 24 is inserted into the speed reducing chamber 59, and the end of the connecting shaft 45a is The output member 70 is directly press-fitted into a press-fitting hole 79 provided in the central portion. Thus, the second carrier 69A in the second planetary gear mechanism 62A is connected to the screw shaft 45 so as not to be relatively rotatable via the output member 70 whose outer periphery is serrated to the inner periphery.

  By the way, in a state where the electric motor 22A is removed from the caliper body 26 and the deceleration chamber 59 is opened, the accommodation recess 35 provided in the caliper body 26 so as to constitute a part of the deceleration chamber 59 is opened. In this state, the reduction gear 23 </ b> A can be disassembled leaving the output member 70 into which the connecting shaft portion 45 a integrally connected to the screw shaft 45 of the screw mechanism 24 is press-fitted in the housing recess 35. As shown in FIG. 7, the output member 70 is formed so as to be able to engage with a twelve-angle socket 80 which is a rotary operation tool. In other words, the outer periphery of the output member 70 is serrated and fitted to the inner periphery of the second carrier 69A so that it can be inserted and removed while being relatively unrotatable. Therefore, a plurality of tooth portions formed on the outer periphery of the output member 70 81, 81... Are engaged with the inner periphery of the twelve angle socket 80 so as not to be relatively rotatable.

  The motor case 83 of the electric motor 22A has a motor chamber 84 formed therein and is attached to the housing portion 26a of the caliper body 26, and a flange portion 86a projecting radially outward is integrally formed at the opening end portion. A metal yoke 86 having a cylindrical shape with a bottom, and a brush holder 87 made of a resin, for example, a synthetic resin, which closes the open end of the yoke 86 so that the outer peripheral portion is brought into contact with the flange portion 86a. And a metal lid member 88 that sandwiches the brush holder 87 with the yoke 86.

  Collars 89 formed in a cylindrical shape with metal are embedded at a plurality of, for example, three places spaced apart in the circumferential direction of the outer peripheral portion of the brush holder 87, and the flange portion 86 a and the brush holder 87 are embedded therein. Bolts 90 inserted through the collars 89 are screwed into the housing portion 26a of the caliper body 26. That is, the motor case 83 of the electric motor 22A is detachably fastened to the housing portion 26a of the caliper body 26 with bolts 90.

  The lid member 88 is formed by bending a metal plate, and includes a cylindrical bearing housing portion 88a, a disc portion 88b extending outward from the bearing housing portion 88a, and the disc portion 88b. A cylindrical portion 88c that is connected to the outer periphery at right angles and extends toward the speed reducer 23A is integrally formed, and a part of the cylindrical portion 88c is fitted to the brush holder 87 so as to protrude from the brush holder 87 toward the speed reducer 23A. The portion of the cylindrical portion 88 c that protrudes from the brush holder 87 is fitted into the housing portion 26 a of the caliper body 26.

Thus, in a state where the motor case 83 is attached to the housing portion 26 a of the caliper body 26, the opening end of the accommodation recess 35 in the caliper body 26 is closed by the lid member 88 constituting a part of the motor case 83. Therefore, the axial movement of the ring gear 64 in the speed reducer 23A is restricted by the partition wall 36 of the caliper body 26 and the disk portion 88b of the lid member 88, and the movement of the partition wall 36 of the caliper body 26 is controlled . Since the engagement pins 72 projecting from the pin support holes 73 are inserted into the engagement slits 71, the circumferential movement of the ring gear 64 is restricted. Therefore, the partition wall 36 and the disk portion 88b allow the axial movement. By being restricted, the ring gear 64 is substantially fixed to the gear case 60A.

  In addition, an annular seal member 92 having a larger diameter than the inner periphery of the housing recess 35 is interposed between the housing portion 26a of the caliper body 26 and the brush holder 87 outside the cylindrical portion 88c of the lid member 88. An annular seal member 93 is interposed between the flange portion 86 a of the yoke 86 and the brush holder 87 so as to be located inward of the place where the bolt 90 is disposed.

  The motor shaft 95 of the electric motor 22A is rotatably supported by the motor case 83, and one end of the motor shaft 95 is inserted through a ball bearing 96 into a bearing housing 86b provided at the central portion of the closed end of the yoke 86. The other end portion of the motor shaft 95 penetrates the brush holder 87 and the lid member 88 rotatably and enters the deceleration chamber 59, and the other end portion of the motor shaft 95 is inserted into the deceleration chamber 59. A first sun gear 63 is engraved on the outer periphery. A ball bearing 97 with a seal is interposed between the bearing housing portion 88 a of the lid member 88 and the motor shaft 95 in order to prevent inflow of grease from the deceleration chamber 59 to the motor chamber 84.

  In the motor chamber 84, the motor shaft 95 is provided with an armature 99 having a commutator 98, and a plurality of magnets 100, 100... Are fixed to the inner periphery of the yoke 86 at a portion corresponding to the armature 99.

  Referring to FIGS. 8 and 9 together, a central hole 101 into which a part of the commutator 98 is inserted is provided at the center of the brush holder 87 so as to penetrate the motor shaft 95. The brushes 102 and 102 that are in sliding contact with the commutator 98 are slidable along the radial direction of the commutator 98 at two positions around the center hole 101 on the surface facing the motor chamber 84. The fitting holding cylinders 103 are fitted integrally with the commutator 98 so as to extend long along the radial direction of the commutator 98, and each brush 102 is contracted between the fitting holding cylinders 103. It is urged | biased by the side which contacts the commutator 98 by the spring (not shown) which is carried out.

  Capacitor holding portions 105... Are provided at a plurality of, for example, three locations around the center hole 101 at equal intervals on the surface of the brush holder 87 facing the motor chamber 84. A capacitor 104 for reducing radio noise is held by the capacitor holding unit 105 selected from the holding units 105..., And in this embodiment, two capacitor holding units 105 adjacent to the brush holding unit 103. Is done.

  Referring to FIGS. 10 and 11 together, the capacitor holding portion 105 is formed along a plane orthogonal to the axis of the electric motor 22A and the surface of the capacitor 104 is brought into contact therewith. The electric motor 22A includes a support surface 106 formed on the brush holder 87, and a pair of hooks 107 and 108 that are formed integrally with the brush holder 87 and sandwich the capacitor 104 between the support surface 106 and the electric motor 22A. The capacitor 104 is configured to be restricted from moving in a plane perpendicular to the axis.

  The support surface 106 is formed as a bottom surface of a rectangular recess 109 provided on a surface of the brush holder 87 facing the motor chamber 84, and a substantially half portion on the one surface side of the capacitor 104 is formed on the support surface 106. It is inserted into the recess 109. By inserting approximately half of the capacitor 104 into the recess 109, the movement of the capacitor 104 in a plane perpendicular to the axis of the electric motor 22A is restricted.

  The hooks 107 and 108 are formed integrally with the brush holder 87 so as to rise from the opening end side edge of the recess 109 in order to prevent the capacitor 104 from being detached from the recess 109. The mold holders 110 and 111 for extracting the molds forming the hooks 107 and 108 are formed in the brush holder 87 so as to open to the bottom surface of the recess 109, that is, the support surface 106. Thus, one hook 107 is arranged so as to rise from the opening end side edge of the recess 109 on one side of the intermediate portion of the recess 109 along the insertion direction 119 of the capacitor 104 into the recess 109. 108 is arranged to rise from the opening end side edge of the recess 109 on the other side of the front end of the recess 109 along the insertion direction 119.

  The pair of terminals 104a and 104b extending from the capacitor 104 has a pair of grooves 112 and 112 formed in the brush holder 87 so that one end is connected to the recess 109 on the side opposite to the side where the hook 1108 is disposed. The wall 114 provided in the brush holder 87 so as to separate the grooves 112 and 113 is inclined so as to guide the capacitor 104 when the capacitor 104 is inserted into the recess 109. A guide surface 114a is formed.

  The other ends of the grooves 112 and 113 are continuous with the windows 115 and 116 provided on the brush holder 87 across both surfaces of the brush holder 87, and a part of the windows 115 and 116 faces the windows 115 and 116. The bus bars 117 and 118 are embedded in the brush holder 87, and the terminals 104a and 104b of the capacitor 104 are electrically connected to the bus bars 117 and 118 by soldering or the like at the portions facing the windows 115 and 116, respectively.

  By the way, as shown in FIG. 4, the heat insulation space 121 is arrange | positioned between the motor chamber 84 formed in the motor case 83 of the electric motor 22A, and the deceleration chamber 59 which accommodates the reduction gear 23A. Thus, the motor chamber of the brush holder 87 that constitutes a part of the motor case 83 and is interposed between the motor chamber 84 and the speed reduction chamber 59 so as to be fastened to the caliper body 26 around the opening end of the housing recess 35. A heat insulation space recess 122 is provided on the surface opposite to the surface 84, and the heat insulation space 121 is formed by the heat insulation space recess 122 and the lid member 88 sandwiching the brush holder 87 between the yoke 86. Is done.

  Referring to FIG. 12 and FIG. 13 together, a labyrinth-like communication path 123 that connects between the deceleration chamber 59 and the motor chamber 84 is formed in the outer peripheral portion of the motor case 83.

  The communication passages 123 are provided at a plurality of circumferential positions on the connecting portion of the disc portion 88 b and the cylindrical portion 88 c in the lid member 88 constituting a part of the motor case 83, and communicate with the speed reduction chamber 59. One communication hole 124, an annular passage 125 formed between the disk portion 88b of the lid member 88 and the brush holder 87 and communicating with the first communication hole 124, and one end of the annular passage 125. An annular space 127 formed between the opening end of the brush holder 87 and the yoke 86 so as to connect the second communication hole 126 provided in the brush holder 87, the second communication hole 126, and the motor chamber 84. It consists of.

  The brush holder 87 is integrally provided with a cylindrical portion 87a that is disposed on the outer side of the fitting holding cylinder 103 along the radial direction of the yoke 86 and that is close to the inner periphery of the opening end of the yoke 86. 86 is formed between the inner periphery of the open end of 86 and the outer periphery of the cylindrical portion 87a, and a plurality of, for example, two second communication holes 126... The brush holder 87 is provided so as to connect the annular passage 125 in a straight line.

  Further, the brush holder 87 is integrally provided with a coupler portion 87b for supplying power to the electric motor 22A so as to protrude outward, and the inside of the motor chamber 84 is passed through the coupler portion 87b. An external communication path 128 communicating with the outside is provided in the brush holder 87.

  The external communication path 128 includes a third communication hole 129 provided in the brush holder 87 so as to open at one end to the motor chamber 84 inside the cylindrical portion 87a at a portion corresponding to the coupler portion 87b. The fourth communication hole 130 extends linearly so as to connect the other end of the communication hole 129 and the coupler 87b.

  Next, the operation of the first embodiment will be described. The caliper body 26 of the disc brake 21A has a cylinder hole 34 into which the brake piston 38 is slidably fitted, and an accommodation recess 35 coaxial with the cylinder hole 34. Are provided so as to open to the opposite sides with the partition wall 36 interposed therebetween, and are connected to the output member 70 of the speed reducer 23A, part of which is accommodated in the accommodating recess 35, in a relatively non-rotatable manner and coaxially. A screw mechanism 24 having a screw shaft 45 that rotatably passes through the partition wall 36 is provided between the speed reducer 23A and the brake piston 38 so as to convert the rotation of the screw shaft 45 into an axial advance / retreat operation of the brake piston 38. An electric motor 22A for inputting rotational power to the speed reducer 23A is attached to the caliper body 26, and is integrated with the screw shaft 45 in the cylinder hole 34. A sliding bearing 54 formed in the shape of a flat plate is interposed between the flange portion 45b facing the partition wall 36 and the partition wall 36, but on the surface of the flange portion 45b facing the partition wall 36. A fitting recess 56 is formed, and the sliding bearing 54 is fitted into the fitting recess 56. Therefore, the sliding bearing 54 can be attached to the flange portion 45b to facilitate the assembly, and the distance between the flange portion 45b of the screw shaft 45 and the partition wall 36 of the caliper body 26 is set short. This can contribute to shortening the axial length of the electric brake device.

  The reduction gear 23 </ b> A includes an output member 70 that is coaxial with the screw shaft 45, and the end portion of the connecting shaft portion 45 a that the screw shaft 45 has integrally and coaxially is press-fitted coaxially and directly to the output member 70. Therefore, the axial displacement of the screw shaft 45 with respect to the output member 70 can be prevented, and it is not necessary to form the outer periphery of the end portion of the screw shaft 45, that is, the outer periphery of the connecting shaft portion 45a, thereby reducing the number of processing steps. be able to.

  Further, the speed reducer 23A includes an output member 70 and a second carrier 69A that coaxially surrounds the output member 70, and the outer periphery of the output member 70 is serrated to the inner periphery of the second carrier 69A. Even if the axis of the shaft 45 is slightly inclined with respect to the output member 70, the second carrier 69A can be automatically aligned, and the rotation of the components of the speed reducer 23A is stabilized.

  By the way, the reduction gear 23A is a two-stage planetary gear type reduction gear in which first and second planetary gear mechanisms 61 and 62A are provided between the motor shaft 95 of the electric motor 22A and the screw shaft 45 of the screw mechanism 24. The first planetary gear mechanism 61 includes a first sun gear 63 provided on the motor shaft 95, a ring gear 64 fixed to the gear case 60A, and the ring gear 64. And a first carrier 66 that rotatably supports a plurality of first planetary gears 65 meshing with the first sun gear 63, and the second planetary gear mechanism 62 </ b> A meshes with the inner periphery of the first carrier 66 on the outer periphery. Second sun gear 67, ring gear 64 common to first planetary gear mechanism 61, and a plurality of second planetary gears 68 meshing with ring gear 64 and second sun gear 67. A second carrier 69A that rotatably supports a is one and a said output member 70.

  According to such a reduction gear 23A, the ring gear 64 that is common to the first and second planetary gear mechanisms 61 and 62A is fixed to the gear case 60A, so that a bearing member is interposed between the ring gear 64 and the gear case 60A. There is no need, and accordingly, the number of parts can be reduced and the gear case 60A can be reduced in size. Moreover, since the inner periphery of the first carrier 66 of the first planetary gear mechanism 61 is meshed with the outer periphery of the second sun gear 67 in the second planetary gear mechanism 62A, the second sun gear 67 is press-fitted into the first carrier 66. It is not necessary to secure the press-fitting length required in this case, and it is possible not only to avoid the enlargement of the reduction gear 23A of the two-stage planetary gear type in the axial direction, but also to eliminate the press-fitting step. The assembling work is facilitated, and the rotation can be stabilized by the self-aligning action by the engagement of the second sun gear 67 and the first carrier 66. Further, the outer peripheral shape of the second sun gear 67 is the same in the meshing portion with the first carrier 66 and the meshing portion with the second planetary gears 68, so that the processing of the second sun gear 67 can be facilitated.

By the way, the motor case 83 of the electric motor 22A attached to the caliper body 26 so as to close the accommodating recess 35 provided in the caliper body 26 of the disc brake 21A, and the caliper body 26 constituting the gear case 60A together with the motor case 83, In the meantime, a reduction chamber 59 partially formed by the storage recess 35 is formed so as to receive the reduction gear 23A, and the ring gear 64 is a circle of the lid member 88 forming a part of the motor case 83. A plurality of bottomed pin support holes 73 are inserted into the partition wall 36 of the caliper body 26 that is inserted into the deceleration chamber 59 so as to be prevented from moving in the axial direction by the plate portion 88b and the caliper body 26 . And pin support holes 73 at the end of the ring gear 64 opposite to the electric motor 22A. A plurality of corresponding engagement slits 71 are provided, and one end portions of a plurality of engagement pins 72 extending in parallel with the axis of the ring gear 64 are fitted into the pin support holes 73, respectively. The other end of each engagement pin 72 is inserted, and the end of the ring gear 64 opposite to the electric motor 22A is uneven in the caliper body 26 so that the rotation of the ring gear 64 around the axis is restricted. Since they are engaged, the ring gear 64 common to the first and second planetary gear mechanisms 61 and 62A can be substantially fixed to the caliper body 26 constituting a part of the gear case 60A.

However also, it is possible to reduce the number of parts for substantially fixing the ring gear 64 to the caliper body 26, also only in engagement slit 71 ... the engaging pin 72 ... inserting the ring gear 64 in the speed reduction chamber 59 Since it is inserted, the assembly of the ring gear 64 is facilitated.

  Further, the width d of the engagement slits 71 along the circumferential direction of the ring gear 64 and the outer diameter D of the engagement pins 72 are within a range in which the ring gear 64 is limited within a plane orthogonal to the axis of the reduction gear 23A. Since the displacement is set to be allowed, the ring gear 64 can move in a plane orthogonal to the axis by the gap 74 formed between the engagement slits 71 and the engagement pins 72. The shaft misalignment of the first and second planetary gear mechanisms 61 and 62A can be absorbed, and smooth rotational power can be transmitted by the speed reducer 23A.

  Further, since an annular seal member 92 having a diameter larger than the inner periphery of the housing recess 35 is interposed between the brush holder 87 constituting a part of the motor case 83 and the caliper body 26, the minimum This sealing member 92 can prevent water or the like from entering the deceleration chamber 59 and the motor case 83.

  In the first planetary gear mechanism 61, one end portions of a plurality of first support pins 75 are fixed to the first carrier 66, and the first support holes 76 provided in the first planetary gears 65 are first in the first support holes 76. The other end portions of the support pins 75 are inserted, and the annular recess 91 facing the other end portion of each first support pin 75 is a wall surface facing the first planetary gear 65 of the gear case 60A. In the first embodiment, since it is formed on the flat plate portion 88b of the lid member 88 that is a part of the motor case 83 that constitutes the gear case 60A together with the caliper body 26, the first carrier 66 is axially relative to the first planetary gear 65. The length of the first support pins 75 is set long while preventing the other end of the first support pins 75 projecting from the first planetary gears 65 from contacting the inner surface of the gear case 60A. Can, thereby ensuring first first support pin 75 ... rotational stability takes allowance greatly to the first planetary gear 65 ... of the planetary gears 65 ....

  The accommodation recess 35 provided in the caliper body 26 is closed when the electric motor 22A is attached to the caliper body 26 to form a part of the deceleration chamber 59, and is opened when the electric motor 22A is detached from the caliper body 26. However, the speed reducer 23A has an output member 70 that can be engaged with the twelve-angle socket 80 and fixed to the screw shaft 45, and when the speed reduction chamber 59 is opened, the output member 70 is placed in the housing recess 35. Since the electric motor 22A is removed and most of the speed reducer 23A is removed, the twelve-angle socket 80 is engaged with the output member 70 and rotated. By operating the parking brake state, it is possible to release the reduction gear 2 on the screw shaft 45 of the screw mechanism 24. It is possible to exert a manual operating force not through the A, it is possible to release the parking brake state by a relatively small manual operation amount.

  The resin brush holder 87 provided in the electric motor 22A is provided with capacitor holding portions 105 for holding capacitors 104 for reducing radio noise. Accordingly, the capacitors 104 are held by the capacitor holding portions 105, so that the capacitors 104 are prevented from being shaken by vibration, and the electrical connection of the capacitors 104 is released, or the terminals 104a of the capacitors 104 ... ..., 104b ... can be prevented from breaking. Further, since the capacitors 104 can be held by the capacitor holding portions 105, it is not necessary to hold the capacitors 104 when the terminals 104a, 104b, etc. of the capacitors 104 are electrically connected, and the assembling workability can be improved. In addition, no adhesive or the like is required for holding the capacitors 104... On the brush holder 87, and the cost can be reduced.

  In addition, the capacitor holding portion 105 is formed along a plane perpendicular to the axis of the electric motor 22A, and a support surface 106 formed on the brush holder 87 so as to abut one surface of the capacitor 104, and the brush holder 87 and has hooks 107 and 108 sandwiching the capacitor 104 between the support surface 106 and the support surface 106, and restricts the movement of the capacitor 104 in a plane perpendicular to the axis of the electric motor 22A. The capacitors 104 can be held in the brush holder 87 with a simple structure.

  Further, a heat insulating space 121 is disposed between the motor chamber 84 formed in the motor case 83 of the electric motor 22A and the speed reduction chamber 59 that accommodates the speed reducer 23A so that at least a part of the caliper body 26 is formed. Therefore, heat transfer from the electric motor 22A to the speed reducer 23A can be suppressed, and even if the parts constituting the speed reducer 23A are made of synthetic resin, thermal deformation and strength reduction can be suppressed.

  Further, the heat insulation is provided on the brush holder 87 that constitutes a part of the motor case 83 and is interposed between the motor chamber 84 and the speed reduction chamber 59 so as to be fastened to the caliper body 26 around the open end of the housing recess 35. Since the heat insulation space recess 122 for forming the space 121 is provided, it is possible to reduce the weight of the brush holder 87 and thus the motor case 83 while forming the heat insulation space 121, and further reduce the cost by reducing the material. Can be achieved.

  In addition, a ball bearing with a seal for preventing the inflow of grease from the deceleration chamber 59 to the motor chamber 84 is provided between the cover member 88 constituting a part of the motor case 83 in the electric motor 22A and the motor shaft 95. 97 is interposed, but a communication path 123 connecting the speed reduction chamber 59 and the motor chamber 84 is formed in the outer peripheral portion of the motor case 83, so that a pressure difference is generated between the speed reduction chamber 59 and the motor chamber 84. There is no need to increase the sealing accuracy near the ball bearing 97 with seal interposed between the motor shaft 95 and the cover member 88, or to add another seal part. In addition, it is possible to prevent the grease from flowing into the motor chamber 84 with a simple structure that avoids an increase in cost by simply forming the communication passage 123 in the outer peripheral portion of the motor case 83. Can. Moreover, since the communication path 123 has a maze shape, it is possible to prevent grease from flowing into the motor chamber 84 via the communication path 123.

  Further, the brush holder 87 is provided with a fitting holding cylinder 103 slidably holding a brush 102 slidably contacting a commutator 98 provided on the motor shaft 95 so as to face the motor chamber 84, and a yoke in the motor case 83. A cylindrical portion 87a that is disposed outside the fitting holding cylinder 103 along the radial direction of the 86 and is opposed to the inner periphery of the open end of the yoke 86 is integrally provided. The inner periphery of the open end of the yoke 86 and the cylindrical portion 87a are integrally provided. Since an annular gap 127 constituting a part of the communication path 123 is formed between the outer circumferences of the two, the grease reaches the sliding contact portion of the brush 102 to the commutator 98 even if the grease should flow into the communication path 123. In other words, the sliding contact portion of the brush 102 with the commutator 98 is not affected by the grease.

  Further, the brush holder 87 is integrally provided with a coupler portion 87b for supplying power to the electric motor 22A so as to protrude outward, and the motor chamber 84 is communicated to the outside through the coupler portion 87b. Since the external communication path 128 is provided in the brush holder 87, the movement of the grease can be prevented by setting the motor chamber 84 and the deceleration chamber 59 to the same pressure as the external pressure. In addition, since an external connector is connected to the coupler portion 87b, water, dust and the like do not enter the motor chamber 84 from the external communication path 128.

  A second embodiment of the present invention will be described with reference to FIGS. 14 to 18, but the portions corresponding to the first embodiment are only given the same reference numerals and are not illustrated in detail.

  First, in FIG. 14 and FIG. 15, this electric brake device for a vehicle is connected to a disc brake 21B, an electric motor 22B that can be rotated in forward and reverse directions attached to a caliper body 26 of the disc brake 21B, and the electric motor 22B. A speed reducer 23B and a screw mechanism 24 provided between the brake piston 38 of the disc brake 21B and the speed reducer 23B so as to convert the rotational motion output from the speed reducer 23B into an axial forward / backward motion.

  The disc brake 21B includes a disc rotor 25B and a pair of friction pads 27 and 28 that are arranged opposite to both side surfaces of the disc rotor 25B and are arranged between the disc rotor 25B and the caliper body 26.

  A motor case 137 of the electric motor 22B is attached to the housing portion 26a of the caliper body 26 so as to close the open end of the accommodating recess 35, and a gear case constituted by the motor case 137 and the caliper body 26. A reduction chamber 133 formed at least in part by the accommodation recess 35 is formed in 60B, and the reduction gear 23B is accommodated in the reduction chamber 133.

  As in the first embodiment, the screw shaft 45 of the screw mechanism 24 is integrally provided with a flange portion 45b that faces the partition wall 36 of the caliper body 26, and a fitting ring 56 provided in the flange portion 45b has a flat ring shape. The sliding bearing 54 is fitted, and a washer 55 is interposed between the sliding bearing 54 and the partition wall 36.

  The speed reducer 23B is provided with a first planetary gear mechanism 61 and a second planetary gear mechanism 62B between the motor shaft 95 of the electric motor 22B and the connecting shaft portion 45a of the screw shaft 45 in the screw mechanism 24. It is made up of.

  Referring to FIGS. 16 and 17 in combination, the first planetary gear mechanism 61 includes a first sun gear 63 provided on the motor shaft 95, a ring gear 64 fixed to the gear case 60B, the ring gear 64 and A first carrier 66 that rotatably supports a plurality of, for example, three first planetary gears 65 meshed with the first sun gear 63, and the second planetary gear mechanism 62 </ b> B is disposed on the inner periphery of the first carrier 66. The second sun gear 67 meshed with the outer periphery, the ring gear 64 common to the first planetary gear mechanism 61, and a plurality of, for example, three second planetary gears 68 meshed with the ring gear 64 and the second sun gear 67. And a second carrier 69B that is rotatably supported.

The ring gear 64 common to the first and second planetary gear mechanisms 61 and 62B is fixed to the gear case 60B with the same structure as that of the first embodiment. That is, the ring gear 64 having a plurality of engagement slits 71 at the end opposite to the electric motor 22B includes a lid member 141 constituting a part of the motor case 137 of the electric motor 22B, and a partition wall of the caliper body 26. 36 is inserted into the deceleration chamber 133 so as to be restricted in axial movement, and the end of the ring gear 64 opposite to the electric motor 22B is engaged with the engagement pins 72. By being inserted into the slits 71...

  Thus, when the motor case 137 is attached to the housing portion 26 a of the caliper body 26, the opening end of the accommodating recess 35 in the caliper body 26 is closed by the lid member 141 constituting a part of the motor case 137. Accordingly, the ring gear 64 in the speed reducer 23B is restricted from moving in the circumferential direction by being engaged with the partition wall 36 of the caliper body 26, so that the axial movement is restricted by the partition wall 36 and the lid member 141. By doing so, it is substantially fixed to the gear case 60B.

  In the first planetary gear mechanism 61, the other ends of the first support pins 75, one end of which is fixed to the first carrier 66, are inserted into first support holes 76 provided in the first planetary gears 65, respectively. Is done. Moreover, the first planetary gear 65... Is opposed to a lid member 141 in the motor case 137 that constitutes a part of the gear case 60B. The lid member 141 is provided with an annular recess 134 for each first support. It is formed so as to face the other end of the pins 75.

  The second planetary gears 68 mesh with the outer periphery of the half of the second sun gear 67 on the side opposite to the electric motor 22B. The second planetary gears 68 are arranged in the circumferential direction of the second carrier 69B formed in a flat ring shape. A second support hole 78 provided at the center of the second planetary gears 68 is provided at the other end of the second support pins 77 with one end fixed by press-fitting or the like at a plurality of spaced intervals, for example, three locations. Are inserted respectively.

  The end of the connecting shaft 45a that is coaxially and integrally connected to the screw shaft 45 in the screw mechanism 24 is inserted into the reduction chamber 133, and the end of the connecting shaft 45a is The second carrier 69B is press-fitted directly and coaxially into a press-fit hole 135 provided in the central portion.

  By the way, in a state where the electric motor 22B is removed from the caliper body 26 and the deceleration chamber 133 is opened, the accommodation recess 35 provided in the caliper body 26 so as to constitute at least a part of the deceleration chamber 133 is opened. In this state, the speed reducer 23B can be disassembled leaving the second carrier 69B press-fitted with the connecting shaft portion 45a integrally connected to the screw shaft 45 of the screw mechanism 24 in the housing recess 35, and left behind. The second carrier 69B is provided with a plurality of engagement holes 136, which are formed in a non-circular cross section so that the tool for rotation operation can be engaged.

  The motor case 137 of the electric motor 22B has a motor chamber 138 formed therein and is attached to the housing portion 26a of the caliper body 26. A flange portion 139a projecting outward in the radial direction is integrated with the opening end portion. A metal yoke 139 having a bottomed cylindrical shape, a metal bearing holder 140 disposed at an opening end of the yoke 139, and an outer peripheral portion abutting against the flange portion 139a. A synthetic resin lid member 141 that closes the open end of the yoke 139 is formed.

  The bearing holder 140 is formed by bending a metal plate, and includes a cylindrical bearing housing portion 140a and a disc portion 140b extending outward from the bearing housing portion 140a. A plurality of locations on the outer peripheral portion of 140b are caulked and coupled to the inner peripheral portion of the open end of the yoke 139.

  Referring also to FIG. 18, the lid member 141 is formed in a disk shape so as to be able to close the accommodating recess 35 provided in the caliper body 26, and a plurality of lid members 141 are spaced apart in the circumferential direction of the outer periphery thereof. A lid member main portion 141a in which concave portions 142 are formed at locations, and a coupler portion 141b that protrudes outward from the lid member main portion 141a for feeding power to the electric motor 22B are integrally formed of a synthetic resin. A deceleration chamber 133 is formed between the caliper body 26 and sandwiched between the caliper body 26 and the flange portion 139a. The flange portion 139a and the flange portion 139a are fastened together by a plurality of bolts 143. A lid member 141 is fastened to the caliper body 26.

  Moreover, on the outer peripheral surface of the lid member main portion 141a, a cylindrical collar 144 through which the bolts 143 are inserted is disposed between a plurality of boss portions 141c, and the boss portions 141c. The concave portions 142 are formed, and the inner ends of the boss portions 141c along the radial direction of the lid member main portion 141a communicate with the concave portions 142 on both sides of the boss portions 141c. The lightening communication holes 145 are formed.

  In addition, a heat insulating space recess 147 is provided on one of the surface on the electric motor 22B side and the surface on the speed reducer 23B side of the lid member main portion 141a, in this embodiment, on the surface on the electric motor 22B side of the lid member main portion 141a. The motor case 137 is provided with a recessed portion 147 for the heat insulating space of the lid member main portion 141a and a metal bearing holder 140 disposed at the opening end of the yoke 139 so as to cover the recessed portion 147 for the heat insulating space. A heat insulating space 146 is formed between the motor chamber 138 and the deceleration chamber 133 formed therein.

  Further, on the outer periphery of the lid member main portion 141a, a plurality of ribs 148, which are arranged in the recesses 142, are integrally provided.

  The motor shaft 95 of the electric motor 22B is rotatably supported by the motor case 137, and one end of the motor shaft 95 is inserted into a bearing housing 139b provided at the central portion of the closed end of the yoke 139 via a ball bearing 96. The other end portion of the motor shaft 95 passes through the bearing holder 140 and the lid member 141 so as to be rotatable and enters the speed reduction chamber 133, and the other end portion of the motor shaft 95 is inserted into the speed reduction chamber 133. A first sun gear 63 is engraved on the outer periphery, and a ball bearing 97 with a seal is interposed between the bearing housing part 140 a of the bearing holder 140 and the motor shaft 95.

  In the motor chamber 138, the motor shaft 95 is provided with an armature 99 having a commutator 98, and a plurality of magnets 100, 100... Are fixed to the inner periphery of the yoke 139 at a portion corresponding to the armature 99.

  A brush holder 152 is fixedly supported on the inner surface side of the bearing holder 140, and a brush (not shown) slidably supported by the brush holder 152 is in sliding contact with the commutator 98.

  An annular seal member 92 having a larger diameter than the inner periphery of the housing recess 35 is interposed between the housing portion 26a of the caliper body 26 and the lid member 141, and the flange portion 139a and the lid member 141 of the yoke 139 are interposed. An annular seal member 93 located inside the bolts 143... Is disposed between them.

  According to the second embodiment, similarly to the first embodiment, the fitting recess 56 is formed on the surface of the flange 45b of the screw shaft 45 facing the partition wall 36, and the flat ring-shaped slide bearing 54 is fitted into the fitting recess 56. Therefore, the sliding bearing 54 can be attached to the flange portion 45b for easy assembly, and the space between the flange portion 45b of the screw shaft 45 and the partition wall 36 of the caliper body 26. The distance can be set short, which can contribute to shortening the axial length of the electric brake device.

  The speed reducer 23B includes a second carrier 69B that is coaxial with the screw shaft 45, and the end of the connecting shaft portion 45a that the screw shaft 45 is integral with and coaxial with the second carrier 69B is coaxially and directly press-fitted. Therefore, the axial displacement of the screw shaft 45 with respect to the second carrier 69B can be prevented, and it is not necessary to form the outer periphery of the end portion of the screw shaft 45, that is, the outer periphery of the connecting shaft portion 45a, so that the number of processing steps can be reduced. Can be reduced.

  The reduction device 23B is a two-stage planetary gear type reduction device in which first and second planetary gear mechanisms 61 and 62B are provided between the motor shaft 95 of the electric motor 22B and the screw shaft 45 of the screw mechanism 24. The first planetary gear mechanism 61 includes a first sun gear 63 provided on the motor shaft 95, a ring gear 64 fixed to the gear case 60B, the ring gear 64, and the like. A first carrier 66 rotatably supporting a plurality of first planetary gears 65 meshing with the first sun gear 63, and the second planetary gear mechanism 62B is meshed with the inner periphery of the first carrier 66. A second sun gear 67, a ring gear 64 common to the first planetary gear mechanism 61, and a plurality of second planetary gears 68 meshing with the ring gear 64 and the second sun gear 67. A second carrier 69B that supports the standing.

  According to the speed reducer 23B, the ring gear 64 that is common to the first and second planetary gear mechanisms 61 and 62B is fixed to the gear case 60B. Therefore, the bearing member is interposed between the ring gear 64 and the gear case 60B. There is no need, and accordingly, the number of parts can be reduced and the gear case 60B can be reduced in size. Moreover, since the inner periphery of the first carrier 66 of the first planetary gear mechanism 61 is meshed with the outer periphery of the second sun gear 67 in the second planetary gear mechanism 62B, the second sun gear 67 is press-fitted into the first carrier 66. It is not necessary to secure the press-fitting length necessary for the case, and it is possible not only to avoid the increase in the axial direction of the two-stage planetary gear type speed reducer 23B but also to eliminate the press-fitting process and to assemble it. The operation is facilitated, and the rotation can be stabilized by the self-aligning action by the engagement of the second sun gear 67 and the first carrier 66. Further, the outer peripheral shape of the second sun gear 67 is the same in the meshing portion with the first carrier 66 and the meshing portion with the second planetary gears 68, so that the processing of the second sun gear 67 can be facilitated.

A reduction chamber 133 for accommodating the reduction gear 23B is formed between the motor case 137 of the electric motor 22B attached to the caliper body 26 so as to close the accommodation recess 35 provided in the caliper body 26 and the caliper body 26. Then, the ring gear 64 is inserted into the deceleration chamber 133 so as to be prevented from moving in the axial direction by the lid member 141 and the caliper body 26 constituting a part of the motor case 137, and the caliper constituting the inner wall of the deceleration chamber 133 A plurality of bottomed pin support holes 73 are provided in the partition wall 36 of the body 26, and a plurality of engagement slits 71 corresponding to these pin support holes 73 are provided at the end of the ring gear 64 opposite to the electric motor 22B. Are provided, and one end of a plurality of engagement pins 72 extending in parallel with the axis of the ring gear 64 is provided in each pin support hole 73. Is inserted the other end portion of the engaging pin 72 in the engagement slit 71, respectively while being, respectively fitted, the end opposite to the electric motor 22B is about the axis of the ring gear 64 round the ring gear 64 Since the concave and convex engagement with the caliper body 26 is performed so as to restrict the movement, the ring gear 64 common to the first and second planetary gear mechanisms 61 and 62B can be substantially fixed to the caliper body 26.

However also, it is possible to reduce the number of parts for substantially fixing the ring gear 64 to the caliper body 26, also only in engagement slit 71 ... the engaging pin 72 ... inserting the ring gear 64 in the speed reduction chamber 59 Since it is inserted, the assembly of the ring gear 64 is facilitated.

  Further, an annular seal member 92 having a larger diameter than the inner periphery of the housing recess 35 is interposed between the lid member 141 constituting a part of the motor case 137 and the caliper body 26. This sealing member 92 can prevent water and the like from entering the deceleration chamber 133 and the motor case 137.

  In the first planetary gear mechanism 61, one end portions of a plurality of first support pins 75 are fixed to the first carrier 66, and the first support holes 76 provided in the first planetary gears 65 are first in the first support holes 76. The other end portions of the support pins 75 are inserted, and the annular recess 134 facing the other end portions of the first support pins 75 is formed on the wall surface facing the first planetary gear 65 of the gear case 60B. In the second embodiment, the lid member 141 that forms part of the motor case 137 that constitutes the gear case 60B together with the caliper body 26 is formed on the lid member 141, so that the first carrier 66 moves relative to the first planetary gears 65 in the axial direction. The length of the first support pins 75 can be set long while preventing the other end of the first support pins 75 protruding from the one planetary gear 65 from coming into contact with the inner surface of the gear case 60B. , Whereby it is possible to secure the first first support pin 75 ... take allowance significantly to the first planetary gear 65 ... rotational stability of the to the planetary gears 65 ....

  The accommodation recess 35 provided in the caliper body 26 is closed when the electric motor 22B is attached to the caliper body 26 to form a part of the deceleration chamber 133, and is opened when the electric motor 22B is detached from the caliper body 26. However, the speed reducer 23B includes a second carrier 69B that is fixed to the screw shaft 45 so as to be provided with a plurality of engagement holes 136 that can be engaged with the rotary operation tool. When opened, the second carrier 69B remains in the receiving recess 35 and can be disassembled so that the second carrier 69B is housed in the speed reduction chamber 133. Therefore, the second motor 69B is removed while the electric motor 22B is removed and most of the speed reducer 23B is removed. It is possible to release the parking brake state by engaging the rotation tool with the carrier 69B and rotating it. , And the it is possible to exert a manual operating force not through a reduction gear 23B to the screw shaft 45 of the screw mechanism 24, it can be released with a relatively small manual operation amount parking brake state.

  A heat insulating space 146 is provided between the motor chamber 138 formed in the motor case 137 of the electric motor 22B and the speed reduction chamber 133 that accommodates the speed reducer 23B so that at least a part of the caliper body 26 is formed. Since it is arranged, heat transfer from the electric motor 22B to the speed reducer 23B can be suppressed, and even if the parts constituting the speed reducer 23B are made of synthetic resin, the thermal deformation and strength reduction can be suppressed. it can.

  In addition, the heat insulation is formed on the lid member 141 that constitutes a part of the motor case 137 and is interposed between the motor chamber 138 and the speed reduction chamber 133 so as to be fastened to the caliper body 26 around the opening end of the housing recess 35. Since the heat insulation space recess 147 for forming the space 146 is provided, it is possible to reduce the weight of the lid member 141 and thus the motor case 137 while forming the heat insulation space 146, and further reduce the cost by reducing the material. Can be achieved.

  Further, the lid member 141 includes a lid member main portion 141a formed in a disc shape so as to close the accommodating recess 35 provided in the caliper body 26, and the lid member main portion 141a for supplying power to the electric motor 22B. Are integrally formed with a coupler portion 141b protruding outward from the outer periphery of the lid member main portion 141a, and a plurality of cylindrical collars 144 through which bolts 143 are inserted are embedded. Are formed between the boss portions 141c and the boss portions 141c, respectively. The inner ends of the boss portions 141c along the radial direction of the lid member main portion 141a are Are formed on the opposite sides of the boss portions 141c of the boss portions 141c of the boss portions 141c of the boss portions 141c of the boss portion 141c. It is possible to reduce the emissions. Moreover, even if water from the outside enters the recess 142, which is located at the upper position when the vehicle is mounted, the water can flow to the lower recess 142 side through the lightening communication hole 145, and water is accumulated in the recess 142. This can prevent the surrounding parts from being rusted and prevent the lid member 141 from being deteriorated in durability.

  Moreover, since a plurality of ribs 148 arranged in the recesses 142 are integrally provided on the outer periphery of the lid member main part 141a, it is possible to prevent the strength of the lid member 141 from being lowered due to the formation of the recesses 142. it can.

  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. Is possible.

21A, 21B ... disc brakes 22A, 22B ... electric motors 23A, 23B ... speed reducer 24 ... screw mechanism 25A, 25B ... disc rotor 26 ... caliper body 27 which is a motion conversion mechanism , 28 ... Friction pad 35 ... Housing recess
36... Partition 45... Screw shafts 59 and 133 that are rotating shafts. Reduction chamber 61... First planetary gear mechanisms 62 A and 62 B. 1 sun gear 64 ... ring gear 65 ... first planetary gear 66 ... first carrier 67 ... second sun gear 68 ... second planetary gears 69A, 69B ... second carrier 71 ... Engagement slit 72 ... engagement pin
73 ... Pin support holes 83, 137 ... Motor case 92 ... Seal member 95 ... Motor shaft

Claims (2)

The disc rotor (25A, 25B) has a disc brake (21A, 21B) in which the friction pads (27, 28) face each other, an electric motor (22A, 22B), and a rotary shaft (45). A motion converting mechanism (24) for moving the friction pads (27, 28) forward and backward with respect to the disk rotor (25A, 25B) according to the rotation of (45), and first and second planetary gear mechanisms (61, 62A; 61, 62B) and an electric brake device for a vehicle including a reduction gear (23A, 23B) provided between the electric motor (22A, 22B) and the rotating shaft (45),
A first planetary gear mechanism (61) includes a first sun gear (63) provided on the motor shaft (95) of the electric motor (22A, 22B), a ring gear (64), the ring gear (64) and the first gear A first carrier (66) rotatably supporting a first planetary gear (65) meshing with one sun gear (63);
The second planetary gear mechanism (62A, 62B) includes a second sun gear (67) rotating with the first carrier (66), the ring gear (64) common to the first planetary gear mechanism (61), A second carrier (69A) rotatably supports a second planetary gear (68) meshing with the ring gear (64) and the second sun gear (67), and is coaxially connected to the rotating shaft (45) and relatively non-rotatably. 69B),
The motor case (83, 137) of the electric motor (22A, 22B) moves the reduction chamber (59, 133) that houses the reduction gear (23A, 23B) into the caliper body (26 of the disc brake (21A, 21B). ) And is attached to the caliper body (26),
The ring gear (64) is inserted into the deceleration chamber (59, 133) so as to be prevented from axial movement by the motor case (83, 137) and the caliper body (26),
A plurality of bottomed pin support holes (73) are provided in the partition wall (36) of the caliper body (26) constituting the inner wall of the deceleration chamber (59, 133),
A plurality of engagement slits (71) corresponding to the plurality of pin support holes (73) are provided at the end of the ring gear (64) opposite to the electric motor (22A, 22B) ,
One end portions of a plurality of engagement pins (72) extending in parallel with the axis of the ring gear (64) are fitted in the plurality of pin support holes (73), respectively, and the plurality of engagement slits (71) The other end portions of the plurality of engagement pins (72) are respectively inserted, and the rotation of the ring gear (64) around the axis is restricted ,
The width of each engagement slit (71) and each engagement along the circumferential direction of the ring gear (64) so as to absorb the axial deviation of the first and second planetary gear mechanisms (61, 62A, 62B). The outer diameter of the pin (72) is set so as to allow the ring gear (64) to be displaced within a limited range within a plane orthogonal to the axis of the speed reducer (23A, 23B). An electric brake device for vehicles. The caliper body (26) is provided with an accommodation recess (35) that is closed by the motor case (83, 137) so as to constitute a part of the deceleration chamber (59, 133), and the motor case ( 83,137) and between said caliper body (26), according to claim 1 Symbol of annular sealing member a larger diameter than the inner periphery of the housing recess (35) (92) is characterized in that it is interposed The electric brake device for vehicles.

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