JP2009132373A - Motor-driven actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven actuator that can prevent generation of hitting sound due to rattling of an output shaft of a motor. <P>SOLUTION: The motor-driven actuator is equipped with the motor 6 having the output shaft 68, a worm 69 attached to the output shaft 68, and a rotation member 5 having a worm wheel 62 engaging with the worm 69 inside a case 3, wherein a bearing member 71 having a regulating face 74 in contact with a distal end of the output shaft 68 and deflecting by a biasing force of a spring 75 in such a manner that the regulating face 74 pushes the distal end of the output shaft 68 into its thrust direction is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric actuator device used for a vehicle or the like.

  An electric actuator device is incorporated in an electric steering lock device that locks or unlocks a steering shaft of a vehicle by the power of a motor. A conventional electric steering lock device of this type is disclosed in Patent Document 1. As shown in FIGS. 10, 11, and 12, the electric steering lock device 100 includes a case 103 including a case main body 101 and a case cover 102 that covers a lower portion of the case main body 101. In the case 103, a motor 104, a worm 106 that transmits the rotation of the output shaft 105 of the motor 104, a worm wheel 107 that meshes with the worm 106, a cam mechanism that changes with the rotation of the worm wheel 107, A lock bolt 108 for locking that is linearly moved by the cam mechanism is housed.

  The worm wheel 107 has a substantially cylindrical shape, and is rotatably held by the case 103 by cylindrical portions 101 a and 102 a respectively provided on the case main body 101 and the case cover 102. Inside the worm wheel 107, a lock bolt 108 is disposed so as to be able to advance and retract along the rotation axis direction.

  In addition, the engagement protrusion 113 provided on the outer peripheral surface of the lock bolt 108 is slidably engaged with the case cover 102 in order to prevent the lock bolt 108 from being rotated together with the worm wheel 107. A mating groove 114 is provided.

  The cam mechanism is held by a cam groove 109 provided on the outer peripheral surface of the cylindrical portion 108 a of the lock bolt 108 so as to be inclined with respect to the circumferential direction, and a vertical groove 110 provided on the inner peripheral surface of the worm wheel 107. When the worm 106 and the worm wheel 107 are rotated by the rotation of the motor 104, the cam follower 111 moves in the cam groove 109, so that the lock bolt 108 moves forward and backward from the lock bolt insertion hole 112 of the case 103. In addition, it is configured to shift between a lock position where a steering shaft (not shown) is locked and a lock release position where the steering shaft is not locked.

JP 2006-015984 A

  In the electric steering lock device 100 of Patent Document 1, a thrust load is generated in the worm 106 attached to the output shaft 105 of the motor by meshing with the worm wheel 107. For example, in FIG. 10, when the output shaft 105 and the worm 106 are rotated forward so that the worm wheel 107 rotates counterclockwise, the thrust reaction force applied from the worm wheel 107 to the worm 106 causes the motor output shaft 105 to move to the motor. Acts in the thrust direction toward the projecting side. On the other hand, when the output shaft 105 and the worm 106 are reversely rotated so that the worm wheel 107 rotates clockwise, the thrust reaction force applied from the worm wheel 107 to the worm 106 is directed toward the motor in the thrust direction. Act on. Due to the reversing operation of the motor, the output shaft 105 of the motor is rattled in the thrust direction, which is one of the causes of the reduction of the motor life.

  In this electric steering lock device 100, the end portions 117 and 118 of the case 103 housing the motor are configured to abut on the front end and the rear end of the output shaft 105, so that the backlash in the thrust direction of the output shaft 105 of the motor is reduced. However, since the case 103 has dimensional variations during manufacture, there is some clearance between the motor output shaft 105 and the end portions 117 and 118 of the case 103 with some allowance. It is necessary to provide. For this reason, when the gap becomes large due to variation in dimensions, the structure of the electric steering lock device 100 disclosed in Patent Document 1 cannot prevent the play in the thrust direction due to the gap. In addition, there is a problem that it is impossible to prevent a collision sound (click sound) generated when the output shaft 105 collides with the case 103 when the motor is operated.

  In view of the circumstances described above, it is an object of the present invention to provide an electric actuator device that can prevent rattling of an output shaft of a motor and can prevent the occurrence of collision hitting sound by the output shaft during motor operation. .

  In order to solve the above-described problems, an electric actuator device according to the present invention includes a motor having an output shaft, a worm attached to the output shaft, and a rotating member having a worm wheel portion meshing with the worm. An electric actuator device comprising: a restricting surface that contacts the tip of the output shaft, wherein the restricting surface is displaced by a biasing force of a spring so as to push the tip of the output shaft in a thrust direction of the output shaft. The configuration is provided.

  According to this electric actuator device, the gap between the motor output shaft and the bearing member can be reduced by moving the bearing member by the biasing force of the spring. Thereby, the clearance of the output shaft of the motor can be reduced by the restriction surface of the bearing member, and the backlash in the thrust direction of the output shaft can be reliably prevented. As a result, it is possible to prevent the occurrence of collision hitting sound due to the output shaft during motor operation.

  In this electric actuator device, a motor cover that holds the motor at a predetermined position in the case is provided, and the motor cover may be provided with a fixing portion that prevents movement of the bearing member by being assembled to the case. Good.

  In this case, since the motor cover is prevented from moving by the fixing portion of the motor cover by assembling the motor cover to the case, the bearing member is in contact with the case main body in a state where the tip of the output shaft abuts. It is fixed and it can prevent that a bearing member shifts from a position where it was fixed during operation.

  In this electric actuator device, the case is provided with a storage portion for movably storing the bearing member, and the operating direction of the bearing member urged by the urging force of the spring in the storage portion is set to the output shaft of the motor. It may be set in a direction intersecting with the thrust direction.

  In this way, since the bearing member is arranged so as to be movable in the storage portion in a direction intersecting the thrust direction of the output shaft, the bearing member is directed toward the bearing member in the thrust direction with respect to the output shaft of the motor during operation. Even if a strong thrust load is applied, a part of the load related to the bearing member is received by the side surface of the storage portion, and the remaining load acts on the bearing member so as to resist the urging force of the spring. That is, the load acting in the direction in which the bearing member is moved against the urging force of the spring can be reduced, so that the displacement of the bearing member can be prevented. Moreover, the load to the fixed part of a fixing | fixed part and a bearing member is reduced, and it can prevent that the fixing state of the bearing member by a fixing | fixed part is cancelled | released.

  In this electric actuator device, the restriction surface of the bearing member is provided so as to face perpendicular to the thrust direction of the output shaft, and the operating direction of the bearing member is at a predetermined angle with respect to the restriction surface. It is good also as a structure made to incline.

  If it does in this way, the shaft center of an output shaft can be received from the front by a regulation surface, and the blur of the shaft center of an output shaft at the time of motor operation can be prevented. Thereby, the meshing defect etc. with a worm and a worm wheel can be prevented.

  In the electric actuator device of the present invention, it is possible to surely prevent the output shaft of the motor from rattling in the thrust direction, and as a result, it is possible to prevent the occurrence of collision hitting sound caused by the output shaft during motor operation.

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

  1 and 2 show an electric steering lock device (hereinafter abbreviated as “lock device”) that employs an electric actuator device according to an embodiment of the present invention. This locking device is disposed around a steering shaft that rotates in response to a steering operation (not shown), and operates in conjunction with a push switch or a card key for starting or stopping an engine or the like. It is. The steering shaft has an engagement recess formed at a predetermined position in the circumferential direction, as in the conventional case.

  The locking device according to the present embodiment includes a case 3 including a case body 1 and a case cover 2 that are open at one end, and a lock bolt 4, a rotating member 5, and a rotational motion of the rotating member 5 are locked inside the case 3. 4, a cam mechanism for converting into a forward and backward movement, a motor 6 as an actuator, a motor cover 7, and a control board 8 for controlling the operation of the motor 6 are disposed.

  As shown in FIG. 3, the case main body 1 is formed of a rectangular container having one end opened, and includes a motor disposition portion 11 for disposing a motor 6, a lock mechanism for disposing a lock bolt 4 and a rotating member 5. The mounting portion 12, the screw hole 13 for fixing the case cover 2 with screws, the board boss 14 for fixing the control board 8 with screws, and the motor cover 7 with screws fixed. A motor cover screw hole 15 is formed.

  The motor disposing portion 11 disposes the motor 6, and as shown in FIGS. 3 and 5 a, the motor housing recess 16 along the outer shape of the motor 6 is formed on the closing surface, and the motor housing recess 16 A worm storage recess 17 for storing the worm 69 attached to the output shaft 68 of the motor 6 in communication and a shaft holding portion 18 having a substantially U-shaped cross section for rotatably holding the tip portion of the output shaft 68 of the motor 6. Are formed in a straight line. On the front end side of the shaft holding portion 18 (on the side opposite to the motor housing concave portion 16), a first storage portion 19 (storage portion) that movably stores a first bearing member 71 described later communicates with the shaft holding portion 18. Is provided. The first storage part 19 is recessed in a substantially triangular prism shape, faces the end part side of the shaft holding part 18, the longitudinal direction of the worm storage recess 17, that is, the output shaft 68 of the motor 6 when the motor 6 is mounted. A first side surface 19a provided to be orthogonal to the thrust direction, a second side surface 19b provided to be inclined and opposed to the first side surface 19a at a predetermined angle with respect to the first side surface 19a, and the second side It has the 3rd side surface 19c provided substantially orthogonally to the side surface 19b. On the other hand, on the rear end side of the motor storage recess 16, a second storage portion 20 (formed by extending the motor placement portion 11 by a predetermined length at a position corresponding to the rear end of the output shaft 68 of the motor 6. As shown in FIG. 5a).

  The lock mechanism disposing portion 12 disposes the lock bolt 4 and the rotating member 5, and is provided with a lock bolt insertion hole 22 that penetrates along the attaching direction of the case cover 2. Further, around the lock bolt insertion hole 22, a rotation holding portion 23 that protrudes inward so as to form an annular shape around the lock bolt insertion hole 22 and rotatably supports the rotating member 5 is provided. ing. Two rotation prevention holes 24 (rotation prevention part and rotation prevention part 24) that hold the engagement part 50 of the lock bolt 4 (described later) so as to be able to move forward and backward are respectively provided at positions facing each other across the lock bolt insertion hole 22 in the rotation holding part 23. A lock bolt holding part) is provided. The rotation prevention hole 24 has a substantially square cross section and is formed in parallel to the penetration direction of the lock bolt insertion hole 22. The inner surface in the radial direction is formed so as to be inclined toward the opposite surface as it goes back, and the sectional shape of the opening is set to be the largest. Further, a step portion 25 with which the upper surface of the rotating member 5 abuts is provided on the outer peripheral portion outside the rotation holding portion 23. A restricting convex portion 26 for restricting the rotation range of the rotating member is provided at a predetermined position on the outer peripheral surface of the step portion 25 so as to protrude in the radial direction.

  The case cover 2 closes the opening of the case body 1 and is provided with a screw insertion hole 31 at a position corresponding to the screw hole 13 of the case body 1 as shown in FIG. The case cover 2 is provided with a cylindrical concave portion 32 that holds the lower end surface of the rotating member 5 at a position corresponding to the rotation holding portion 23 of the lock mechanism arrangement portion 12. At the center of the bottom surface of the cylindrical recess 32, a spring mounting shaft 33 for projecting and mounting a lock bolt spring 44 for biasing the lock bolt 4 in the advancing direction is provided. Further, the case cover 2 is provided with a notch 34 for exposing the connector 91 for electrical connection on a side wall orthogonal to the side wall located on the side opposite to the cylindrical recess 32.

  The lock bolt 4 is disposed inside the rotary member 5 so as to be able to advance and retreat in the direction of the rotation axis of the rotary member 5, and can be inserted into the lock bolt insertion hole 22 as shown in FIGS. The lock member 41 has a square prism shape, and a cam member 42 that drives the lock member 41 forward and backward.

  At the upper end of the lock member 41, an engagement convex portion 43 that is inserted and locked into the engagement concave portion of the steering shaft is provided. The lock member 41 is moved to the steering shaft side by the motor 6 via the rotating member 5 and the cam mechanism and is engaged with the engagement recess, and the lock member 41 is moved backward to release the engagement. It is moved so as to advance and retreat between the lock positions. Further, when the engagement convex portion 43 does not coincide with the engagement concave portion in the circumferential direction, it is urged in the advance direction by the lock bolt spring 44, and when it coincides, it is advanced and engaged with the urging force. . As shown in FIG. 2, the lock member 41 is provided with a mounting projection 45 projecting from the lower portion so as to be connected to the cam member 42. The mounting convex portion 45 has a rectangular cross section, and is provided with a connecting hole 46 over an opposing surface located in a direction orthogonal to the axial direction.

  The cam member 42 has a substantially cylindrical shape that is disposed inside a rotating member 5 described later. The cam member 42 is provided with a through hole 47 that passes through the upper and lower ends along the axis of the lock member 41. The through hole 47 has a rectangular shape with the upper portion coinciding with the mounting projection 45, and a connection hole 49 through which the connection pin 48 passes is provided at a position corresponding to the connection hole 46. Further, the lower portion of the through hole 47 has a conical shape into which an end of a lock bolt spring 44 as an urging member is inserted. The end of the lock bolt spring 44 is positioned by the end surface of the lock member 41 attached to the upper portion of the through hole 47. Further, on the upper surface of the cam member 42, the cam member 42 with respect to the case main body 1 is engaged with the rotation prevention hole 24 of the case main body 1 so as to be able to advance and retreat at a position opposed to the through hole 47 and engaged in the circumferential direction. Two engaging portions 50 that prevent the rotation of the projection are provided. The engaging portion 50 has a shape that is substantially the same as the shape of the rotation prevention hole 24 of the case body 1, and is slightly smaller than the rotation prevention hole 24. Specifically, the engaging portion 50 is provided so as to protrude in parallel with the advancing direction of the lock member 41 along a surface that substantially coincides with the outer peripheral surface of the cam member 42, and the radially inner surface is in the protruding direction. It is formed so as to be inclined and tapered toward the opposite surface as it goes. Further, the engaging portion 50 is formed longer than the length of the moving distance from the lock position of the lock bolt 4 to the unlock position, and even when the lock bolt 4 moves to the unlock position, the rotation prevention hole 24. And the engaging portion 50 are maintained in an engageable state. In addition, the cam member 42 is prevented from being inclined with respect to the operating shaft of the lock bolt 4 because the engaging portion 50 is held by the radially outer surface of the rotation prevention hole 24.

  A pair of cam grooves 51, 52 recessed in a substantially semicircular shape that swirls so as to form a spiral shape are provided on the outer peripheral portion of the cam member 42 so as to face each other in the radial direction, and the first cam groove 51 on one side is The second cam groove 52 is shifted from the second cam groove 52 by about the height of the second cam groove 52 and shifted toward the advancing direction side of the lock bolt 4 and is shifted by 180 ° in the circumferential direction. The cam grooves 51 and 52 convert the rotational power of the rotating member 5 into linear motion of the lock bolt 4 via the cam member 42.

  FIG. 8 is a development view of the outer peripheral surface of the cam member 42, in which the equally spaced vertical lines are angle lines every 10 degrees, the vertical direction in the figure indicates the height direction, and the upper side is the lock bolt. 4 corresponds to the front end side (namely, the steering shaft side), while the lower side in the figure corresponds to the rear end side of the lock bolt 4. The cam grooves 51 and 52 have a predetermined region at one end (lower end) set in advance as a lock region 53 (starting point) of the steering shaft by the lock bolt 4 and a predetermined region at the other end (upper end) of the steering shaft by the lock bolt 4. It is preset as an unlock area 54 (end point). The advance / retreat speed of the lock bolt 4 is set by the inclination angle of the inclined portion 55 between the lock area 53 and the unlock area 54. In the present embodiment, the first cam groove 51 is at least the height in the vertical direction from the lock region 53 to the unlock region 54 of the second cam groove 52 with respect to the second cam groove 52, and the advancing and retreating direction of the lock bolt 4. Since the first cam groove 51 and the second cam groove 52 are prevented from interfering with each other, the inclination angle and length of the inclined portion 55 of each cam groove 51, 52 can be freely set. It is possible to do. Therefore, the inclination angle of the inclined portion 55 is not required to be changed in the middle due to lack of space, and can be set to a constant angle. As described above, when the inclination angle of the inclined portion 55 is constant, the cam follower 67 does not collide with the stepped portion in the middle of the inclination, so that it is possible to eliminate the occurrence of collision hitting sound between the cam follower 67 and the stepped portion. it can.

  The rotating member 5 is a cylindrical member having an inner diameter slightly larger than that of the cam member 42 and can be rotated in the circumferential direction without being moved in the axial direction so as to be sandwiched between the case main body 1 and the case cover 2. It is what is supported. Specifically, as shown in FIGS. 2 and 4, the rotating member 5 is provided with an outer fitting portion 61 that fits to the outer peripheral portion of the rotation holding portion 23 of the case body 1 at one end (upper end) thereof. ing. In addition, a plurality of helical teeth (not shown) are formed on the upper portion of the rotating member 5 so as to protrude from the outer peripheral surface of the outer fitting portion 61 in a radial L-section and extend along the axial direction on the outer peripheral portion. A worm wheel portion 62 is provided. As shown in FIG. 5 a, the worm wheel portion 62 is engaged with the teeth of a worm 69 disposed so as to extend in the tangential direction in the attached state to the case body 1, thereby rotating the rotating member 5 around the axis. Rotate as Further, on the upper surface of the worm wheel portion 62, a restriction receiving portion 63 (shown in FIG. 4) is provided so as to engage with the restriction convex portion 26 of the case body 1 and restrict the rotation range of the rotating member 5. Yes. Furthermore, a pair of longitudinal grooves 64 and 65 recessed in a substantially semicircular shape extending upward along the axial direction from the lower end are provided on the inner peripheral surface of the rotating member 5 so as to face each other in the radial direction. As shown in FIG. 2, the vertical groove 64 on one side extends to a position corresponding to the second cam groove 52, and the vertical groove 65 on the other side extends to a position corresponding to the first cam groove 51. It extends longer than the longitudinal groove 64 and is provided.

  The cam follower 67 is formed of a spherical steel ball, and is disposed in each of the longitudinal grooves 64 and 65 of the rotating member 5, as shown in FIG. Then, when the rotating member 5 is rotated in a state where the protruding portions from the vertical grooves 64 and 65 are fitted in the cam grooves 51 and 52 of the cam member 42, the vertical grooves 64 and 65 are circumferentially moved. By being rotated, it slides along the cam grooves 51, 52 of the cam member 42 that is restricted so as not to rotate, and the lock bolt 4 is moved to the rotational axis of the rotating member 5 through the cam member 42. Move forward and backward.

  As described above, in the present embodiment, the lock bolt 4 is provided with a cam mechanism that transmits the rotational force of the rotating member 5 to the lock bolt 4 and moves the lock bolt 4 between the lock position and the unlock position. The cam grooves 51 and 52 and a cam follower 67 disposed between the rotating member 5 and the cam member 42 are configured.

  The motor 6 is a power source for moving the lock bolt 4, and is disposed in the motor housing recess 16 of the case body 1 via the motor cover 7. The motor 6 is capable of a forward rotation operation for moving the lock bolt 4 forward and a reverse rotation operation for moving the lock bolt 4 backward. As shown in FIG. A worm 69, which is a screw gear formed with spiral teeth (not shown) along, is disposed. The front end and the rear end of the output shaft 68 are in contact with a first bearing member 71 and a second bearing member 77, which will be described later, and the backlash in the thrust direction of the output shaft 68 is restricted.

  The first bearing member 71 is housed in the first housing portion 19 of the case body 1 and abuts against the tip of the output shaft 68 of the motor 6 to prevent the play of the output shaft 68 in the thrust direction. It is made of a resin material such as polyacetal. As shown in FIGS. 1 and 5a, the first bearing member 71 is a block body having a substantially wedge-shaped cross section, and a spring positioning portion 72 for positioning the spring 75 projects from the wide end surface side, and the other end It is formed so that the space | interval of both side surfaces becomes narrow as it goes to. The opposing angles of the both side surfaces are set in the same manner as the opposing angles of the first side surface 19 a and the second side surface 19 b of the first storage portion 19, and the side surface corresponding to the first side surface 19 a is the output of the motor 6. A regulating surface 74 is in contact with the tip of the shaft 68. That is, when the first bearing member 71 is disposed along the first side surface 19 a of the first storage portion 19, the regulation surface 74 always faces the orthogonal direction to the thrust direction of the output shaft 68 of the motor 6. It is configured. In addition, the first bearing member 71 is inclined toward the motor 6 as the second side surface 19b of the first storage portion 19 moves in the traveling direction, and the spring 75 is attached along the surface direction of the second side surface 19b. It is energized by power. Therefore, the first bearing member 71 is also changed in the direction in which the output shaft 68 of the motor 6 is pushed in the thrust direction by the urging force of the spring 75. Furthermore, on the surface (the lower surface side in FIG. 5) of the first bearing member 71 facing the motor cover 7, a plurality of rows of peaks extending in the thrust direction of the output shaft 68 of the motor 6 are arranged in a direction perpendicular to the thrust direction. The deformable deformable portion 76 is provided.

  The second bearing member 77 is housed in the second housing portion 20 of the case body 1 and is in contact with the rear end of the output shaft 68 of the motor 6 to prevent the output shaft 68 from generating backlash in the thrust direction. Yes, it is made of a resin material such as polyacetal. The second bearing member 77 has a substantially rectangular parallelepiped shape and is fitted and fixed in the second storage portion 20.

  The motor cover 7 is for housing the motor 6 in the motor disposition portion 11 of the case body 1 so as not to fall off. As shown in FIG. 6, the motor housing recess 81 along the outer shape of the motor 6, and the motor 6 is a rear end side of a motor presser 82 that contacts a part of the motor 6, a worm storage recess 83 that stores the worm 69, and a shaft presser 84 that prevents the output shaft 68 of the motor 6 from coming out of the shaft holder 18. From the front to the front end side. On the front side of the shaft pressing portion 84, there is provided a fixing portion 85 that protrudes in the direction of arrangement of the motor 6 with a rhombus-shaped outer shape portion, and has a tip portion formed at an acute angle. The fixing portion 85 is pressed against the deformation portion 76 of the first bearing member 71 when the motor cover 7 is assembled to the case body 1. Thereby, the deformation | transformation part 76 of the 1st bearing member 71 deform | transforms, the fixing | fixed part 85 bites into the deformation | transformation part 76, the 1st bearing member 71 is fixed to the position, and the 1st bearing member 71 is from the position where it was fixed. Misalignment is prevented. Further, in the motor housing recess 81, an electrode insertion hole 86 for inserting a motor electrode (not shown) extending from the control board 8 and connected to the plus terminal and the minus terminal of the motor 6 is provided. Further, on the rear side of the motor housing recess 81, a second bearing member holding portion 87 is provided so as to abut against the second bearing member 77 and prevent the second bearing member 77 from falling off. Further, an insertion hole 88 for penetrating the lock bolt 4 and the rotating member 5 is provided on the side of the worm storage recess 83. In addition, screw holes 89 are formed at positions corresponding to the motor cover screw holes 15 of the case body 1.

  The control board 8 includes a microcomputer (not shown) for controlling the operation of the motor 6, a micro switch (not shown) for detecting the advance position of the lock bolt 4 via the rotating member 5, and a main microcomputer mounted on the vehicle. A connector 91 for connection to (ECU) and a motor electrode (not shown) connected to an external battery by the connector 91 are mounted. Further, an insertion hole 92 through which the lock bolt 4 and the rotating member 5 are arranged is provided in the assembled state to the case body 1. Further, a screw hole 93 for screwing is formed at a position corresponding to the board boss 14 of the case body 1. In addition, since the detection method of the advance position of the lock bolt 4 by a micro switch is not directly related to the present invention, detailed description thereof is omitted.

  When assembling the lock device having the above-described configuration, first, the lock bolt 4 and the cam follower 67, in which the lock member 41 and the cam member 42 are integrally connected, are assembled to the rotating member 5. At this time, the lock bolt 4 is assembled by penetrating from the lower end opening of the rotating member 5 toward the upper opening, but the engaging portion 50 of the lock bolt 4 is provided so as to protrude toward the protruding direction of the lock member 41. The engaging portion 50 does not interfere with the rotating member 5 during assembly. Thereby, assembly | attachment property can be improved and it is not necessary to form the groove part etc. which prevent the interference with the engaging part 50 in the rotation member 5. FIG.

  Next, these are arranged in the lock mechanism arrangement part 12 of the case body 1 (see FIG. 5a). Subsequently, after the motor 6 is disposed on the case body 1, the second bearing member 77, the first bearing member 71, and the spring 75 are sequentially assembled, the motor cover 7 is disposed, and the motor cover 7 Is fixed to the case body 1 with screws. Thereafter, the control board 8 is disposed in the opening of the case body 1, and the control board 8 is fixed to the case body 1 by screws. Finally, the case cover 2 is attached to the case body 1 and fixed by screwing.

  In the lock device assembled in this way, the tip of the output shaft 68 of the motor 6 is held so as to contact the first bearing member 71, and the rear end of the output shaft 68 is also held so as to contact the second bearing member 77. Is done. Further, since the first bearing member 71 is configured to shift in a direction in which the output shaft 68 is pushed in the thrust direction by the urging force of the spring 75, a gap between the first bearing member 71 and the tip of the output shaft 68 is appropriately set. Can be determined. Thereafter, as shown in FIG. 7, the first bearing member 71 is fitted by deforming the deforming portion 76 of the first bearing member 71 with the fixing portion 85 of the motor cover 7 being pressed by the assembly of the motor cover 7. As a result, the first bearing member 71 is misaligned during operation because it is fixed to the case main body 1 in contact with the tip of the output shaft 68 so as to have a clearance that does not apply a load during rotation. It is prevented. As a result, it is possible to reliably prevent the output shaft 68 from rattling in the thrust direction.

  Furthermore, since the first bearing member 71 is disposed so as to be movable in the first storage portion 19 in a direction intersecting the thrust direction of the output shaft 68, it is assumed that the first bearing member 71 is thrust against the output shaft 68 of the motor 6 during operation. Even if a strong load acts in the direction toward the first bearing member 71, a part of the load related to the first bearing member 71 is received by the second side surface 19 b of the first storage portion 19, and the remaining load is received by the spring 75. It acts on the first bearing member 71 so as to resist the urging force. That is, the load acting in the direction in which the first bearing member 71 is moved against the urging force of the spring 75 can be reduced. Therefore, the load to the fitting part of the fixing | fixed part 85 and the deformation | transformation part 76 is reduced, and the further deformation | transformation of the deformation | transformation part 76 is prevented. Thereby, it becomes possible to maintain the fitting state of the fixing | fixed part 85 and the deformation | transformation part 76, and it becomes possible to maintain the fixing state of the 1st bearing member 71. FIG. Furthermore, since the tip of the output shaft 68 is received from the front by the restriction surface 74 that is orthogonal to the thrust direction, the tip of the output shaft 68 of the motor 6 can be received from the front. It is possible to prevent the shaft center of the output shaft 68 from shaking at the time. Thereby, the meshing defect etc. with the worm 69 and the worm wheel part 62 can be prevented.

The locking device of the present embodiment is assembled as described above, but the second bearing member 77 is configured as shown in FIG. 5b, so that the outputs of the first and second bearing members 71 and 77 and the motor 6 are obtained. An appropriate gap can be provided between the shaft 68.
That is, after the motor 6 is disposed with respect to the case body 1, the second bearing member 77, and the first bearing member 71 and the spring 75 are sequentially assembled. The portion is placed in the temporary storage state inserted into the second storage portion 20, and the rear end of the output shaft 68 is brought into contact with the position of the dotted line 68a shown in FIG. 5b.
The front end of the output shaft 68 is in contact with the first bearing member 71.

  When the motor cover 7 is disposed, the second bearing member 77 is pushed in by the second bearing holding portion 87 (upward in FIGS. 1 and 5b), and the second bearing member 77 is securely inserted into the second storage portion 20. To store. When assembled in this manner, the movement of the first bearing member 71 is fixed by the solid portion 85, and at the same time, the rear end of the output shaft 68 of the motor 6 is located at the position of the second bearing member 77 as shown in FIG. 5b. It becomes possible to contact the bottom surface of the recess 77a.

  Accordingly, an appropriate gap as a bearing can be provided between the first and second bearing members 71 and 77 and the output shaft 68 in accordance with the concave portion 77a of the second bearing member 77, for example, the first The distance between the bearing member 71 and the output shaft 18 can be set to an interval (about 0.2 mm) that does not apply a load when the output shaft 68 of the motor 6 is rotated.

  Next, the operation of the lock device having the above configuration will be described.

  As shown in FIG. 2, when the locking device is in the locked state, the worm 69 attached to the output shaft 68 is rotated in the clockwise direction as viewed from the motor 6 side when the motor 6 is driven to rotate in the forward direction. The rotating member 5 with which the part 62 engages with the worm 69 starts to rotate in the unlocking direction (clockwise direction in FIG. 5a). At this time, the thrust reaction force applied to the worm 69 from the worm wheel portion 62 acts in the thrust direction toward the output shaft 68 of the motor 6 toward the second bearing member 77, but the rear end of the output shaft 68 of the motor 6 is Since the second bearing member 77 contacts the second bearing member 77 without a gap, the output shaft 68 does not rattle.

  When the rotating member 5 starts to rotate in this way, the cam follower 67 located in the lock region 53 in FIG. 8 moves while sliding or rotating in the cam grooves 51 and 52, but the cam follower 67 moves in the longitudinal grooves 64 and 65. Since the lock bolt 4 is in an unrotatable state with the engaging portion 50 engaged with the rotation prevention hole 24, the rotation of the rotating member 5 is not possible. As a result, the lock bolt 4 starts to move downward. When the cam follower 67 moves along the inclined portion 55 of the cam grooves 51 and 52, the lock bolt 4 moves backward from the lock position.

  When the rotating member 5 rotates approximately 250 degrees, it is detected by a micro switch (not shown) that the rotating member 5 has rotated to the unlock position, and the forward drive of the motor 6 is stopped in response to this switch signal. 6 and the inertial rotation of the rotating member 5 causes the cam follower 67 to enter the unlock region 54 from the motor stop position B of the cam grooves 51 and 52 and stop. At this time, as shown in FIG. 9, the lock bolt 4 is retracted to the unlock position where the tip is retracted into the cover body 1.

  Thus, when the lock bolt 4 moves from the lock position to the unlock position, the engagement of the front end of the lock bolt 4 with respect to the engagement recess of the steering shaft is released, and the rotation restriction of the steering shaft is released. Steering is unlocked.

  On the other hand, the motor 6 is driven in reverse to bring the locking device into the locked state. As a result, the worm 69 attached to the output shaft 68 also rotates counterclockwise when viewed from the motor 6 side, and the rotating member 5 with which the worm wheel 62 engages the worm 69 is locked (counterclockwise in FIG. 5a). ) Begin to rotate. At this time, the thrust reaction force applied to the worm 69 from the worm wheel portion 62 acts in the thrust direction toward the output shaft 68 of the motor 6 toward the first bearing member 71, but the tip of the output shaft 68 of the motor 6 is Since the first bearing member 71 is in contact with no gap, the output shaft 68 does not rattle.

  When the rotating member 5 starts to rotate in this way, the cam follower 67 in the unlock region 54 in FIG. 8 moves while sliding or rotating in the cam grooves 51 and 52, and the rotation of the rotating member 5 and the lock bolt The lock bolt 4 starts to move upward by the urging force of the spring 44 for use. When the cam follower 67 moves along the inclined portion 55 of the cam grooves 51 and 52, the lock bolt 4 moves from the unlock position toward the lock position.

  When the rotating member 5 rotates approximately 250 degrees, it is detected by a micro switch (not shown) that the rotating member 5 has rotated to the locked position, and the reverse drive of the motor 6 is stopped in response to this switch signal. Due to the inertial rotation of the rotating member 5, the cam follower 67 slightly enters the lock region 53 from the motor stop position A of the cam grooves 51 and 52 and stops. As a result, the tip of the lock bolt 4 enters and engages in the engagement recess of the steering shaft, the steering shaft is restricted from rotating, and the steering is locked.

  Since the cam grooves 51 and 52 provided in the lock bolt 4 are provided so as to be inclined in the circumferential direction, when the cam follower 67 moves in the cam grooves 51 and 52 by the rotation of the rotating member 5, the lock bolt 4 Rotational force acts on the to rotate in the same direction as the rotating member 5. The rotation of the lock bolt 4 is prevented by the engagement between the engagement portion 50 of the lock bolt 4 and the rotation prevention hole 24. If there is a gap between the engagement portion 50 and the rotation prevention hole 24, The rotation range of the lock bolt 4 is increased, and the impact sound when the engaging portion 50 collides with the rotation prevention hole 24 is increased.

  On the other hand, in the locking device of the present embodiment, the rotating member 5 is externally fitted to the rotation holding portion 23 provided on the case body 1 side and is rotatably held, and the lock bolt 4 is attached to the rotating member 5. It is held by the inner peripheral surface. That is, the lock bolt 4 is in a state of being indirectly positioned by the case body 1 via the rotating member 5. Therefore, by providing the rotation prevention hole 24 on the case body 1 side, the positional deviation of the lock bolt 4 with respect to the rotation prevention hole 24 can be reduced. As a result, the gap between the engagement portion 50 of the lock bolt 4 and the rotation prevention hole 24 can be set small, and the collision between the engagement portion 50 of the lock bolt 4 and the rotation prevention hole 24 due to the rotation of the rotation member 5. It is possible to reduce the hitting sound.

  Further, in the locking device of the present embodiment, since the two cam grooves 51 and 52 are shifted in the operation axis direction of the lock bolt 4, the point of action receiving the force from the cam follower 67 is also in the operation axis direction of the lock bolt 4. It will shift. Since the cross-sectional shape of the cam grooves 51 and 52 is semicircular at this point of action, a force that moves the lock bolt 4 along the operating shaft and a force that pushes the lock bolt 4 inward in the radial direction act. . Therefore, a force acts on the lock bolt 4 so as to incline the operating shaft of the lock bolt 4, but the engagement portion 50 provided on the lock bolt 4 is in the radial direction of the rotation prevention hole 24 which is the lock bolt holding portion. Since the lock bolt 4 is held by the outer side surface, the tilt of the lock bolt 4 can be prevented, and malfunction caused by the lock member 41 and the lock bolt insertion hole 22 caused by the tilt of the lock bolt 4 can be prevented. Further, with respect to the gap between the engaging portion 50 and the radially outer surface of the rotation prevention hole 24, the lock bolt for the rotation prevention hole 24 is provided by providing the rotation prevention hole 24 on the case body 1 side as described above. 4 can be reduced, and as a result, the gap between the engaging portion 50 and the radially outer surface of the rotation prevention hole 24 can be reduced. Thereby, the inclination of the lock bolt 4 can be further prevented.

  The steering lock device of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

  For example, in the embodiment, the lock bolt 4 is configured by connecting the lock member 41 and the cam member 42, but the lock member 41 and the cam member 42 may be integrally formed.

  In the above-described embodiment, the cam mechanism is configured by the cam grooves 51 and 52 provided in the lock bolt 4 and the cam follower 67 disposed between the rotating member 5 and the cam member 42. However, the present invention is not limited thereto. For example, the cam mechanism may be configured such that the cam grooves 51 and 52 are provided on the inner peripheral surface of the rotating member 5 and the cam follower 67 is fixed to the lock bolt 4 side. Further, the cam follower 67 is not limited to a spherical steel ball, and for example, a pin or the like may be fixed to the rotating member 5 or the lock bolt 4.

  In the above-described embodiment, the first cam groove 51 is configured to be shifted from the second cam groove 52 by a height equal to or higher than the second cam groove 52 toward the advance direction of the lock bolt 4. However, the first cam groove 51 is slightly shifted from the second cam groove 52 (less than the height of the second cam groove 52) toward the advancing direction side of the lock bolt 4. It may be. Even with this configuration, a predetermined distance can be provided between the first cam groove 51 and the second cam groove 52, so that interference between the first cam groove 51 and the second cam groove 52 can be prevented. The degree of freedom of setting the inclination angle and length of each cam groove 51, 52 can be improved.

  In the embodiment, the engagement portion 50 of the lock bolt 4 is provided so as to protrude parallel to the advance direction of the lock member 41, and the rotation prevention portion on the case body 1 side is used as the rotation prevention hole 24 that receives the engagement portion 50. However, the present invention is not limited to this. For example, the engaging portion 50 may be a concave portion, and the rotation prevention portion may be a convex portion protruding toward the engaging portion 50.

  In the above embodiment, the biasing force of the spring 75 is applied to the first bearing member 71 itself, the output shaft 68 of the motor 6 is brought into contact with the regulating surface orthogonal to the output shaft 68, and the output shaft 68 is pushed in the thrust direction. However, the present invention is not limited to this. For example, the restricting surface of the first bearing member 71 has a predetermined angle with respect to the surface perpendicular to the thrust direction of the output shaft 68. You may provide so that it may incline.

  In the embodiment, the first bearing member 71 is provided with the deforming portion 76 and the motor cover 7 is provided with the fixing portion 85 so as to fix the first bearing member 71 at a predetermined position. For example, a rubber member or a double-sided tape is attached to the motor cover 7 or the first bearing member 71, and the other member is adhered or adhered to the first bearing member 71. May be fixed. In some cases, the motor may be held on the case body so as not to fall off by a case cover that closes the opening of the case body, and the fixing portion may be provided on the case cover.

  In the above embodiment, an example in which the electric actuator device of the present invention is employed in an electric steering lock device is shown, but the present invention is not limited to this, and the structure of the present invention can be used in all fields. Can be adopted.

It is a disassembled perspective view which shows the electric steering lock apparatus which employ | adopted the electric actuator apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the locked state of the electric steering lock apparatus of FIG. It is the perspective view seen from the opening side of the case main body. It is a disassembled perspective view of a cam mechanism and a case cover. It is the top view which looked at FIG. 2 from the bottom face side. It is a perspective view of the 2nd bearing member with which an above-mentioned electric steering lock device is provided. It is a perspective view of a motor cover. It is a top view which shows the state which attached the motor cover to FIG. It is an outer peripheral surface expanded view of the cam member of a lock bolt. It is sectional drawing which shows the unlocked state of the electric steering lock apparatus of FIG. It is a cross-sectional view of a conventional electric steering lock device. It is a longitudinal cross-sectional view of the electric steering lock device of a prior art example. It is an outer peripheral surface expanded view of the lock bolt of the electric steering lock apparatus of a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Case, 5 ... Rotating member, 6 ... Motor, 62 ... Worm wheel part, 68 ... Output shaft, 69 ... Worm, 71 ... 1st bearing member (bearing Member), 74 ... restriction surface, 75 ... spring.

Claims (4)

  An electric actuator device including a motor having an output shaft, a worm attached to the output shaft, and a rotating member having a worm wheel portion meshing with the worm in a case. An electric actuator device comprising: a regulating surface that contacts, and a bearing member that is displaced by a biasing force of a spring so that the regulating surface pushes the tip of the output shaft in a thrust direction of the output shaft.   The motor cover for holding the motor at a predetermined position in the case is provided, and the motor cover is provided with a fixing portion for preventing the movement of the bearing member by being assembled to the case. The electric actuator device according to 1.   A housing portion for movably housing the bearing member is provided in the case, and an operating direction of the bearing member biased by a biasing force of the spring in the housing portion intersects a thrust direction of the output shaft of the motor. The electric actuator device according to claim 1, wherein the electric actuator device is set in a direction.   The restriction surface of the bearing member is provided so as to face perpendicular to the thrust direction of the output shaft, and the operation direction of the bearing member is inclined at a predetermined angle with respect to the restriction surface. The electric actuator device according to claim 3.

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