JP6577372B2 - Electric steering lock device - Google Patents

Description

  The present invention relates to a housing in which a cover that closes an open end of a body is fastened to a body that is fixed to a steering column that surrounds the steering shaft, an engagement position that engages with the steering shaft, and a mechanism that releases the engagement. A lock pin that is supported by the body to enable linear reciprocation between the mating release positions, and an electric motor that is housed and fixed in the housing to be able to exert power to drive the lock pin; The present invention relates to an electric steering lock device provided with a motion conversion means interposed between the electric motor and the lock pin in the housing so as to convert a rotational motion of the electric motor into a linear motion of the lock pin.

  A lock pin is supported on the body fixed to the steering column to enable linear reciprocation between an engagement position for engaging with the steering shaft and an engagement release position for releasing the engagement. An electric steering lock device in which a housing constituted by a cover fastened to the body accommodates an electric motor and motion conversion means for converting the rotational motion of the electric motor into linear motion of the lock pin is disclosed in Patent It is already known from literature 1, etc.

Japanese Patent No. 4838073

  In the device disclosed in Patent Document 1, when the cover is illegally removed from the body, the motion conversion means is exposed, and the lock pin is driven by the operation of the motion conversion means. There is a possibility that the state will be released illegally.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electric steering lock device that prevents an unauthorized attack to the motion conversion means even if the cover is illegally removed from the body. .

To achieve the above object, the present invention provides a housing in which a cover that closes an opening end of a body is fastened to a body that is fixed to a steering column that surrounds the steering shaft, and an engagement position that engages with the steering shaft. And a lock pin supported by the body that enables linear reciprocation between the disengagement positions for releasing the engagement, and a power that drives the lock pin can be exerted in the housing. An electric motor comprising: a fixed electric motor; and a motion converting means interposed between the electric motor and the lock pin in the housing so as to convert the rotary motion of the electric motor into a linear motion of the lock pin. In the steering lock device, a protective cover interposed between the cover and the motion conversion means, Serial and from the cover side so as to cover the motion converting means is unfastened incapable fastened to the body, the circuit board control unit for controlling the operation of said electric motor is mounted is fixed to the circuit case, The circuit case is accommodated in the body from the cover side at a position adjacent to the motion converting means so as not to expose the circuit board to the cover side, and the protect cover is attached to the circuit case on the cover. is abutting from the side to the first said Rukoto.

  The second protect cover 52 of the embodiment corresponds to the protect cover of the present invention.

  According to the first feature of the present invention, since the motion conversion means is covered from the cover side by the protective cover that is fastened to the body so as not to be released, even if the cover is removed illegally, It is possible to prevent an attack and prevent the steering lock state from being illegally released.

Also, the circuit case which is housed in the housing at a position adjacent to the motion conversion means, since protective cover abuts against the cover side, can not be removed immediately from the body of the circuit case in a state where a cover is removed, Accordingly, it is possible to prevent an unauthorized attack from the circuit case side to the motion conversion means, and to prevent the steering lock state from being illegally released.

It is a perspective view of an electric steering lock device. It is a disassembled perspective view of an electric steering lock device. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1 with a cover omitted. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 5 . It is the perspective view which looked at the cover from the body side. It is the front view which looked at the cover from the body side. FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; It is the 11-11 line sectional view of Drawing 4 in the state where a lock pin exists in an engagement position. It is sectional drawing which shows the operating state of a trigger pin and a lock holding member along the 12-12 line of FIG. With respect to the fastening part, the flow of force at the fastening part when an external force from the side opposite to the trigger pin fixing part acts on the cover is shown in FIG. It is a figure shown by (b). It is a figure which shows the flow of the force in a fastening part when external force acts on a cover from upper direction corresponding to FIG. It is a figure which shows the flow of the force in a fastening part when the external force from the trigger pin fixed part side acts on a cover regarding a fastening part corresponding to FIG. FIG. 10A is a diagram illustrating the flow of force at the fastening portion when an external force is applied to the cover from below, corresponding to FIG. 9A, and FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 to FIG. 16. First, in FIG. 1, this electric steering lock device carries a portable transmitter / receiver in a smart entry system, for example. The steering shaft is released so that the steering shaft 15 can be turned in response to the vehicle user getting into the vehicle, and the steering shaft is moved in response to the vehicle user carrying the portable transmitter / receiver leaving the vehicle. It operates so as to be in a steering lock state so as to prevent the rotation of 15.

  2 to 6, the electric steering lock device includes a housing 17 fixed to a cylindrical steering column 16 that surrounds the steering shaft 15 and an engagement that engages with the steering shaft 15. Enabling the linear reciprocation between the position and the disengagement position for releasing the engagement, enabling the lock pin 18 supported by the housing 17 and the power to drive the lock pin 18 to be exhibited. An electric motor 19 housed and fixed in the housing 17, and a rotation movement of the electric motor 19 is converted into a linear movement of the lock pin 18 so that the electric motor 19 and the lock pin 18 are disposed in the housing 17. And motion conversion means 20 interposed.

  The housing 17 includes a bottomed cylindrical body 21 whose side opposite to the steering column 16 is opened, and a cover 22 that is fastened to the body 21 so as to close an open end of the body 21. 21 and the cover 22 are cast and formed of a light alloy such as a magnesium alloy.

  A surface 21a of the body 21 facing the steering column 16 is formed to have a semicircular cross-sectional shape so as to fit a substantially half circumference of the steering column 16, and protrudes from the surface 21a. As shown in FIG. 5, the protrusion 21 b is integrally protruded from the body 21 so as to be fitted into a fitting hole 23 provided in the side wall of the steering column 16. The steering column 16 is sandwiched between the body 21 and an arcuate holder 24, and both ends of the holder 24 are fastened to the body 21 with screw members 25. A housing 17 is fixed to the steering column 16. In addition, the body 21 at a portion including the protrusion 21b is provided with a slide hole 26 into which the lock pin 18 is fitted to enable linear sliding between the engagement position and the engagement release position. A plurality of engaging recesses 27 that can engage the lock pin 18 are provided on the outer periphery of the steering shaft 15, and the lock pin 18 is engaged with one of the engaging recesses 27. The steering lock state can be obtained.

  The electric motor 19 is housed in a motor housing recess 28 formed in the body 21 on one side of the sliding hole 26 and opened on the cover 22 side, and an arc-shaped bracket covering a part of the electric motor 19 29 is fastened to the body 21 by being fastened to the body 21 and accommodated in the housing 17. One end of the bracket 29 is fastened to the body 21 by a one-way first bolt 30 that can be rotated only in the tightening direction, and the other end of the bracket 29 is rotated only in the tightening direction. It is fastened to the body 21 by a one-way second bolt 31 that enables this, and the bracket 29 is fastened to the body 21 so that fastening release is impossible. Moreover, the bracket 29 is formed of a high-strength nonmagnetic metal material such as stainless steel in order to prevent it from being broken by the action of an external force.

  The motion converting means 20 includes a worm gear 35 provided on the output shaft 34 of the electric motor 19, a worm wheel 36 that meshes with the worm gear 35, a screw shaft 37 that rotates together with the worm wheel 36, and rotation around an axis. A nut 38 that is restricted and is allowed to move in the axial direction and is screwed onto the screw shaft 37 is accommodated in the housing 17.

  The screw shaft 37 is disposed at a position adjacent to the lock pin 18 below and has an axis parallel to the moving direction of the lock pin 18. An intermediate portion along the axial direction of the screw shaft 37 is provided. A male screw 39 is engraved on the outer periphery. Further, the worm wheel 36 is fixed to the screw shaft 37 on the cover 22 side with respect to the male screw 39.

  The nut 38 having a screw hole 40 to be screwed into the male screw 39 is mold-bonded to a slider 41 made of synthetic resin. The slider 41 is linear in a direction parallel to the moving direction of the lock pin 18. The screw 21 is slidably fitted to the body 21 so as to be restricted from rotating around the axis of the screw hole 40, that is, the axis of the screw shaft 37.

  The nut 38 is integrally provided with a connecting arm portion 38 a that protrudes from the slider 41 toward the lock pin 18. On the other hand, the lock pin 18 is integrally provided with a pair of extending wall portions 18a extending in parallel so as to sandwich the connecting arm portion 38a from both sides, and is formed on the extending wall portions 18a. Both ends of the regulation pin 43 inserted through the connecting arm portion 38a are inserted into the long hole 42 extending long in the moving direction of the lock pin 18. Therefore, the lock pin 18 can move relative to the slider 41 and the nut 38 in the axial direction of the screw shaft 37 within a range in which the restriction pin 43 moves in the elongated hole 42. A first coil spring 44 that biases the lock pin 18 toward the engagement position is interposed between the connecting arm portion 38 a and the lock pin 18.

  According to such a connecting structure of the motion converting means 20 and the lock pin 18, the nut 38 is axially moved together with the slider 41 by the rotation of the electric motor 19 in a state where the lock pin 18 is in the disengagement position. The lock pin 18 is moved toward the engagement position by the spring force of the compressed first coil spring 44, and one of the plurality of engagement recesses 27 formed on the outer periphery of the steering shaft 15 is moved. Thus, the lock pin 18 is engaged. At this time, when the lock pin 18 comes into contact with the outer periphery of the steering shaft 15 between the plurality of engaging recesses 27, the first coil spring 44 absorbs the movement of the lock pin 18 blocked, The lock pin 18 can be engaged with the engagement recess 27 by slightly rotating the steering shaft 15. On the other hand, when the electric motor 19 rotates in the direction opposite to the above with the lock pin 18 in the engaged position, the elongated hole of the extension wall portion 18a of the lock pin 18 is moved by the axial movement of the nut 38. 42, the restriction pin 43 moves, and after the restriction pin 43 comes into contact with the end of the elongated hole 42 opposite to the steering shaft 15, the lock pin 18 moves together with the nut 38. The operation of the electric motor 19 is stopped at the disengagement position of the lock pin 18.

  Referring also to FIG. 7, the distance between the outer surface of the body 21 that is the closest to the lock pin 18 (the upper surface 21 c of the body 21 in this embodiment) and the lock pin 18. A flat plate-like first protect cover 45 interposed at least is fixedly disposed in the body 21 so as to cover the lock pin 18 from at least a part of the periphery thereof. The first protect cover 45 is formed of a high-strength metal material such as a cold-rolled steel plate.

In this embodiment, the body 21 is formed with a cover mounting hole 46 that extends in parallel with the sliding hole 26 above the sliding hole 26 and opens to the cover 22 side and the sliding hole 26 side. A flat plate-like first protect cover 45 interposed between the upper surface 21c of the body 21 and the lock pin 18 is inserted into the cover mounting hole 46 so as to cover the lock pin 18 from above. Is done. Moreover, one end portion of the cover mounting hole 46 opposite to the cover 22 is formed so as to press-fit the first protect cover 45, and the body portion is formed at the end portion of the cover mounting hole 46 on the cover 22 side. 21, in order to suppress the backlash in the vertical direction of the first protect cover 45 that is press-fitted and held in one end portion of the cover mounting hole 46, it is applied to one surface opposite to the lock pin 18. A pair of projecting portions 47 that are in contact with each other and press the other surface of the first protect cover 45 toward the body 21 are integrally projected. That is, the first protect cover 45 is press-fitted and fixed in the cover mounting hole 46.

  Incidentally, a leaf spring 49 is held on the first protect cover 45. A pair of holding holes 50, 51 spaced in the longitudinal direction of the first protect cover 45 are formed at the end portion of the first protect cover 45 on the cover 22 side. A substantially U-shaped held portion 49a inserted into the pair of holding holes 50 and 51 is integrally formed. That is, the leaf spring 49 is held at the end of the first protect cover 45 on the cover 22 side, and when the lock pin 18 is in the disengagement position, the leaf spring 49 is attached to the connecting arm portion 38a of the nut 38. Abuts resiliently. Thereby, the screwed state of the screw shaft 37 and the nut 38 when the lock pin 18 is in the disengagement position is maintained.

  A second protective cover 52 interposed between the cover 22 and the motion converting means 20 is fastened to the body 21 so as to cover the motion converting means 20 from the cover 22 side so as not to be released. The two protective covers 52 are formed of a high-strength metal material such as a cold-rolled steel plate.

  The second protect cover 52 includes a flat cover main portion 52a that covers the motion converting means 20 from the cover 22 side, and a first arm portion 52b that extends downward from a lower portion of the cover main portion 52a on the electric motor 19 side. A second arm portion 52c extending upward from the cover main portion 52a so as to cover the first protect cover 45 from the cover 22 side, and extending from the cover main portion 52a to the opposite side of the electric motor 19. The third arm portion 52d is integrally formed.

  The first arm portion 52 b is disposed so as to overlap the other end portion of the bracket 29. A semicircular recess 54 corresponding to the lower half of the insertion hole 53 formed in the other end portion of the bracket 29 so as to allow the second bolt 31 to be inserted is formed in the upper portion of the first arm portion 52b. Is done. That is, the first arm portion 52b is fastened to the body 21 together with the other end of the bracket 29, and the second bolt 31 is a one-way bolt that can be rotated only in the tightening direction. . The second arm portion 52c is fastened to the body 21 by a one-way third bolt 55 that can be rotated only in the tightening direction, and the third arm portion 52d is rotated only in the tightening direction. The second protect cover 52 is fastened to the body 21 in such a manner that the second protect cover 52 cannot be released.

  The second protect cover 52 is formed with a bottomed cylindrical bearing housing 57 that rotatably supports one end of the screw shaft 37, and the body 21 rotates the other end of the screw shaft 37. A freely supported bearing member 58 is fitted and mounted.

By the way, a circuit board 60 on which a control unit 59 for controlling the operation of the electric motor 19 is mounted is fixed in a circuit case 61, and the circuit case 61 is located at a position adjacent to the motion conversion means 20. The circuit board 60 is accommodated in the body 21 from the cover 22 side so that the circuit board 60 is not exposed to the cover 22 side . The circuit board 60 has a plurality of screw members 62 in a circuit case 61 made of synthetic resin. It is fixed with. In this embodiment, the circuit case 61 is disposed at a position adjacent to the electric motor 19 and the motion conversion means 20 from below, and the cover 22 is provided on a side surface of the circuit case 61 facing the cover 22. A pair of elastic contact portions 63 that elastically contact with each other are integrally formed. Further, the first arm portion 52b of the second protect cover 52 is integrally formed with a contact arm portion 52e that contacts the circuit case 61 from the cover 22 side. That is, when the cover 22 is fastened to the body 21 and the second protect cover 52 is fastened to the body 21, the circuit case 61 is fixed in the body 21.

  A pair of magnets 64 are fitted to the lower part of the slider 41, and a pair of magnet holders 65 for fixing the magnets 64 to the slider 41 are attached to the lower part of the slider 41. On the other hand, a sensor (not shown) for detecting the position of the slider 41 by detecting the magnet 64 moving with the slider 41 is disposed on the circuit board 60 disposed below the slider 41. The

  Referring to FIGS. 8 to 10 together, the inner surface of the cover 22 includes a single rib 68 for fastening the cover 22 to the body 21 so as not to be unfastened by the ribs 68 that intersect vertically and horizontally and the second bolts 31. The fastening portion 69 is formed. The fastening portion 69 protrudes from the inner surface of the cover 22 toward the body 21 so as to form a bolt receiving recess 70 that is open on the outer surface side of the cover 22 so as to be able to receive the enlarged head portion 31a of the second bolt 31. A large diameter cylindrical portion 69a, a small diameter cylindrical portion 69b coaxially connected to the large diameter cylindrical portion 69a so as to form an insertion hole 71 through which the second bolt 31 is inserted, and a large diameter cylindrical portion 69a and a small diameter cylindrical portion 69b. It is formed so as to integrally have an annular stepped portion 69c that connects them. The second bolt 31 is inserted into the fastening portion 69, the first arm portion 52 b of the second protect cover 52 and the other end portion of the bracket 29 and screwed into the body 21, and the cover 22. The first arm portion 52b of the second protect cover 52 and the bracket 29 are fastened to the body 21 together with the second bolt 31 so as not to be released.

  11 and 12, the body 21 has a lock holding release position that allows the lock pin 18 to move to the engagement release position side, as shown in FIG. As shown in b), a lock holding member 72 that can operate between the lock holding position for holding the lock pin 18 in the engaged position is supported, and this lock holding member 72 is supported. Is biased by the second coil spring 73 toward the lock holding position.

  The body 21 communicates with a guide hole 74 having one end facing the side surface of the slider 41 with the lock pin 18 in the engaged position, and one end communicates with the other end of the guide hole 74. In addition, a press-fit hole 75 having the other end opened on the side surface of the body 21 is provided so as to extend in a direction perpendicular to the moving direction of the slider 41, and the guide hole 74 has a rectangular cross-sectional shape. The press-fitting hole 75 is formed to have a dome-shaped cross-sectional shape including a rectangular part 75a corresponding to the guide hole 74 and a semicircular part 75b continuous with the upper part of the rectangular part 75a. .

  The lock holding member 72 is formed between the sliding portion 72a and a sliding portion 72a having a rectangular cross section slidably fitted in the rectangular portion 75a of the press-fitting hole 75 and the guide hole 74. A flat plate portion 72c connected to the sliding portion 72a so as to extend inside the guide hole 74 toward the motion converting means 20 while forming a regulation stepped portion 72b facing the press-fitting hole 75, and the slider 41 An engaging protrusion 72d connected to the tip of the flat plate portion 72c so that the locking pin 18 can be engaged with a locking recess 76 provided on the side surface of the flat plate portion 72c. It is formed so as to have a single body.

  A spring receiving member 77 is press-fitted into the press-fitting hole 75. The spring receiving member 77 is integrally connected to a flat plate portion 77a having a shape corresponding to the cross-sectional shape of the press-fitting hole 75 and a lower portion of the flat plate portion 77a so as to lock the rectangular portion 75a of the press-fitting hole 75 in the lock portion 75a. A pair of arm portions 77b extending to the holding member 72 side are integrally formed, and claw portions 77c respectively provided on the pair of arm portions 77b bite into the inner surface of the rectangular portion 75a in the press-fitting hole 75. Thus, the spring receiving member 77 is press-fitted into the press-fitting hole 75.

  In addition, the sliding portion 72 a of the lock holding member 72 is formed with a spring accommodating recess 85 that opens toward the spring receiving member 77, and a second portion that is partially accommodated in the spring accommodating recess 85. The coil spring 73 is contracted between the lock holding member 72 and the flat plate portion 77a of the spring receiving member 77, and the lock holding member 72 is caused by the spring force exerted by the second coil spring 73. The locking pin 18 is urged toward the side where the engaging protrusion 72d is engaged with the locking recess 76 of the slider 41 in the state where the lock pin 18 is in the engagement position, that is, the lock holding position.

  The cover 22 is fixedly provided with a trigger pin 78 that engages with the restriction step portion 72b of the lock holding member 72 at the lock holding release position. A trigger pin fixing portion 79, which is a fixed portion, is disposed on the inner surface of the cover 22 so as to be adjacent to the fastening portion 69 from one side.

  The trigger pin fixing portion 79 is disposed at a position where the boss 80 is sandwiched between the cylindrical boss 80, the first positioning pin 81 disposed above the boss 80, and the fastening portion 69. The boss 80, the first positioning pin 81, and the second positioning pin 82 are formed integrally with the cover 22.

On the other hand, the trigger pin 78 having a rectangular cross section has a base portion 78a that is screwed into the boss 80 with a screw member 83 and through which the first and second positioning pins 8 1 and 82 are inserted. The trigger pin 78 is fixed to the cover 22 by fixing the base portion 78 a to the trigger pin fixing portion 79. That is, in this embodiment, the trigger pin 78 which is a separate member from the cover 22 is fixed to the cover 22, but the trigger pin 78 is formed integrally with the cover 22. Also good.

  The trigger pin 78 fixed to the cover 22 is inserted into an insertion hole 84 having a rectangular cross section provided in the body 21. The insertion hole 84 intersects the lower portion of the guide hole 74 at a position where the trigger pin 78 is engaged with the restriction step portion 72b of the lock holding member 72 located at the lock holding release position. 21. Therefore, when the trigger pin 78 is detached from the body 21 together with the cover 22, the lock holding member 72 in the lock holding release position moves to the lock holding position side by the spring force of the second coil spring 73. The engagement protrusion 72d of the lock holding member 72 is engaged with the engagement recess 76 of the slider 41 in a state where the lock pin 18 is in the engagement position, and the steering lock state is maintained. become.

  Further, the cover 22 is formed with a fragile portion 86 that breaks in response to an external force acting on the cover 22. The fragile portion 86 breaks in response to the action of an external force on the cover 22 so that the portion of the cover 22 including at least the trigger pin fixing portion 79 is detached from the body 21, and the second bolt In this embodiment, the fragile portion 86 includes the large-diameter cylindrical portion 69a, the small-diameter cylindrical portion 69b, and the annular step portion 69c. 1st groove | channel 87 formed in the said annular step part 69c between the said small diameter cylindrical part 69b and the said trigger pin fixing | fixed part 79, and the said trigger pin fixing | fixed part 79 and the said opposite side with respect to the said small diameter cylindrical part 69b. A second groove 88 formed in the annular step portion 69 c and a part of the outer periphery of the small-diameter cylindrical portion 69 b on the side opposite to the trigger pin fixing portion 79 are notched and connected to the second groove 88. A first notch 89, a second notch 90 formed by notching the upper part of the large-diameter cylindrical part 69a in an inclined shape, and a third part formed by notching a part of the upper part of the small-diameter cylindrical part 69b. It is constituted by a notch 91.

  In such a weak portion 86, as shown in FIG. 13A, when the first external force F1 from the opposite side of the trigger pin fixing portion 79 with respect to the fastening portion 69 acts on the cover 22, the fastening portion A force flow as indicated by an arrow 92 is generated in the portion 69, whereby the fragile portion 86 is broken, so that the lower portion 22 a of the cover 22 is one of the fastening portions 69 as shown in FIG. The portion including the trigger pin fixing portion 79 of the cover 22 is detached from the body 21, while remaining attached to the body 21.

  As shown in FIG. 14, when a second external force F2 from above is applied to the cover 22, a force flow as indicated by an arrow 93 is generated in the fastening portion 69, whereby the fragile portion 86 is broken. 13B, the lower portion 22a of the cover 22 including the part of the fastening portion 69 remains while being fastened to the body 21 in the same manner as shown in FIG. The portion including the trigger pin fixing portion 79 is detached from the body 21.

  As shown in FIG. 15, when the third external force F3 from the trigger pin fixing portion 79 side acts on the cover 22 with respect to the fastening portion 69, the fastening portion 69 has a force as indicated by an arrow 94. As the flow is generated and the fragile portion 86 is broken, the lower portion 22a of the cover 22 is fastened to the body 21 including a part of the fastening portion 69 in the same manner as shown in FIG. Although left as it is, the portion of the cover 22 including the trigger pin fixing portion 79 is detached from the body 21.

  Further, as shown in FIG. 16A, when a fourth external force F4 from below acts on the cover 22, a force flow as indicated by an arrow 95 is generated in the fastening portion 69, thereby causing the weakened portion. By breaking 86, as shown in FIG. 16B, the upper portion 22b of the cover 22 includes a part of the fastening portion 69 and remains fastened to the body 21. The portion including the trigger pin fixing portion 79 is detached from the body 21.

  Next, the operation of this embodiment will be described. The position at which the steering shaft 15 is engaged with the cover 22 fastened to the body 21 so as to form the housing 17 together with the body 21 fixed to the steering column 16 and A lock pin 18 that enables linear reciprocation between the positions to release the engagement is supported, and the electric motor 19 is accommodated between the electric motor 19 accommodated and fixed in the housing 17 and the lock pin 18. The motion conversion means 20 for converting the rotational motion of the lock pin 18 into the linear motion of the lock pin 18 is interposed, and this motion conversion means 20 is also accommodated in the housing 17. The outer surface closest to the pin 18 (in this embodiment, the upper surface 21c of the body 21) and the lock pin The metal protection cover 22 interposed at least between the lock pin 18 and the lock pin 18 is fixedly disposed in the body 21 so as to cover the lock pin 18 from at least a part of the periphery thereof. Even if a part of 21 is destroyed, the lock pin 18 is covered with the first protect cover 45, and it becomes difficult to operate the lock pin 18 illegally.

  Further, a part of the motion converting means 20 rotates around the axis in accordance with the operation of the electric motor 19 and extends in the moving direction of the lock pin 18, and around the axis of the screw shaft 37. A nut 38 that is screwed into the screw shaft 37 and cannot be rotated and is linked to and connected to the lock pin 18, and on the side that holds the screwed state of the screw shaft 37 and the nut 38. Since the leaf spring 49 that exerts a spring force for urging the nut 38 is held by the first protect cover 45, the leaf spring 49 can be easily assembled.

  Further, since the second protect cover 52 interposed between the cover 22 and the motion converting means 20 is fastened to the body 21 so as not to be unfastened so as to cover the motion converting means 20 from the cover 22 side. Even if the cover 22 is illegally removed, it is possible to prevent an unauthorized attack to the motion conversion means 20 and to prevent the steering lock state from being illegally released.

  In addition, a circuit board 60 on which a control unit 59 for controlling the operation of the electric motor 19 is mounted in a circuit case 61 accommodated in the body 21 at a position adjacent to the motion conversion means 20. 61, the contact arm 52e of the second protect cover 52 is abutted against the circuit case 61 from the cover 22 side, so that the cover 22 is removed. In this state, the circuit case 61 cannot be immediately removed from the body 21. Therefore, an unauthorized attack from the circuit case 61 to the motion conversion means 20 can be prevented and the steering lock state can be prevented from being illegally released. Can do.

  Further, the body 21 includes a lock holding position for holding the lock pin 18 in the engagement position and a lock holding release position between which the lock pin 18 can move to the engagement release position side. A lock holding member 72 that is spring-biased toward the lock holding position side is supported while being able to operate at the position, and the cover 22 engages with the lock holding member 72 in the lock holding release position. Although the trigger pin 78 is fixed, the cover 22 is formed with a single fastening portion 69 that is fastened to the body 21 so as not to be fastened and the cover of the trigger pin 78. A trigger pin fixing portion 79 which is a fixing portion to the cover 22 is disposed, and a fragile portion 86 which breaks in response to the action of an external force on the cover 22 is broken when the cover 22 is broken. Among them, the portion including at least the trigger pin fixing portion 79 is formed on the fastening portion 69 so as to be detached from the body 21, so that the cover 22 is attached to the body 21 in response to an external force acting on the cover 22. Since the weakened portion 86 formed in the single fastening portion 69 for fastening so as to be unfastened is broken, a portion of the cover 22 including at least the trigger pin fixing portion 79 is detached from the body 21, so that the lock holding member When the engagement of the trigger pin 78 with respect to 72 is released and the lock holding member 72 biased toward the lock holding position moves from the lock holding release position to the lock holding position, the lock pin 18 moves to the engagement position. A certain state, that is, the steering lock state can be securely held, and the steering lock state can be prevented from being illegally released. That.

  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.

15 ... steering shaft 16 ... steering column 17 ... housing 18 ... lock pin 19 ... electric motor 20 ... motion conversion means 21 ... body 22 ... cover 52 ... Protect cover 59 ... Control unit 60 ... Circuit board 61 ... Circuit case

Claims (1)

A housing (17) formed by fastening a cover (22) for closing an open end of the body (21) to a body (21) fixed to a steering column (16) surrounding the steering shaft (15), and a steering shaft ( A lock pin (18) supported by the body (21) to enable linear reciprocation between an engagement position for engaging 15) and an engagement release position for releasing the engagement; and the lock pin An electric motor (19) housed and fixed in the housing (17) that can exert power for driving (18), and the rotational motion of the electric motor (19) is a straight line of the lock pin (18). Motion conversion means (20) interposed between the electric motor (19) and the lock pin (18) in the housing (17) so as to convert it into motion; The electric steering lock device comprising,
A protect cover (52) interposed between the cover (22) and the motion converting means (20) is fastened to the body (21) so as to cover the motion converting means (20) from the cover (22) side. It is concluded that it cannot be released ,
A circuit board (60) on which a control unit (59) for controlling the operation of the electric motor (19) is mounted is fixed in the circuit case (61), and the circuit case (61) The circuit board (60) is accommodated in the body (21) from the cover (22) side so as not to be exposed to the cover (22) side at a position adjacent to the means (20), and the protect cover ( 52), the electric steering lock device according to claim Rukoto be contact from the cover (22) side in the circuit case (61).

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