JP5731889B2 - Steering lock device - Google Patents

Description

  The present invention relates to a steering lock device that locks rotation of a steering shaft of an automobile.

  As this type of conventional steering lock device, one disclosed in Patent Document 1 is known. FIG. 13 shows the configuration of the steering lock device described in Patent Document 1. The steering lock device 101 includes a lock member 106 for prohibiting rotation of a steering shaft (not shown), an electric motor 104 for operating the lock member 106, and a lock groove 194 for engaging with the lock member 106. A key lock collar 193 that rotates integrally with the steering shaft, a vibration sensor 111 that detects vibration applied to the steering shaft, and alarm means (not shown) that issues an alarm, and locks the key lock collar 193. The end of the lock member 106 that engages with the groove 194 and the lock groove 194 is tapered.

  The lock member 106 engages with the lock groove 194 to displace the electric motor 104 between a steering lock position that prohibits rotation of the steering shaft and an unlock position that is separated from the lock groove 194 and permits rotation of the steering shaft. Move by.

  When the lock member 106 detects the vibration applied to the steering shaft by the vibration sensor 111 in the locked state where the lock member 106 is located at the steering lock position, the electric motor 104 operates in a direction to press the lock member 106 against the key lock collar 193. In addition, the alarm means is configured to issue an alarm.

  In the above configuration, when a rotational force is applied to the steering shaft due to a reaction force from the tire in a locked state while the vehicle is parked, a gap between the side of the lock groove 194 and the side of the lock member 106 is provided. A large frictional force acts to make it difficult for the lock member 106 to come off, but by providing the taper 195 in the lock groove 194 of the key lock collar 193 that engages with the lock member 106 and the lock member 106, the key from the road surface via the tire is provided. When the steering lock is released in a state where a rotational force is applied to the lock collar 193, a component force is generated on the lock member 106 toward the unlock position, and the lock member 106 can be easily pulled out.

  When the vibration sensor 111 detects abnormal vibration in the locked state, the electric motor 104 operates in a direction to press the lock member 106 against the lock groove 194 of the key lock collar 193. Thereby, the component force to the unlocking position side generated by the taper 195 is canceled out, and the lock member 106 is prevented from coming off from the lock groove 194 of the key lock collar 193.

JP 2004-230973 A

  However, in the above-described conventional steering lock device 101, when the vehicle is parked with the steering wheel turned off, a reaction force from the tire applies a force in the rotational direction to the steering shaft while it is parked. A component force toward the unlocking position is generated in the lock member 106. For this reason, in order to cancel out the generated component force, the electric motor 104 has to be continuously operated, and there is a problem that the battery may run out.

  In view of the above circumstances, an object of the present invention is to provide a steering lock device capable of easily releasing the steering lock during the unlocking operation while maintaining the locked state without causing the battery to run out.

  The invention of claim 1, which achieves the above object, is arranged so as to be movable between a lock guide hole penetrating the front side and the back side of the frame, and a locking position and an unlocking position set in the lock guide hole. A lock main body having a tapered shape with a tapered tip, an engagement portion provided on the lock main body, and the lock guide hole closer to the unlocking position than the engagement portion located at the locking position. A hook portion projecting inward, and when the lock body falls in the rotation direction of the steering shaft in the lock guide hole in a state where the lock body is located at the locking position, the engagement portion is attached to the hook portion. The engagement is restricted, and the movement of the lock body toward the unlocking position is restricted.

  A second aspect of the present invention is the steering lock device according to the first aspect, wherein the hanger is linked to the lock main body and is movable with the lock main body between a locking position and an unlocking position. A biasing spring that is sandwiched between the hanger and the lock body and biases the lock body toward the locking position; the hanger has a substantially convex cross section in which a large rectangular portion and a small rectangular portion are combined. A link receiving portion having a shape, wherein the flange portion is set at a stepped portion between a large rectangular portion and a small rectangular portion of the link receiving portion, and a leading end portion is provided at the rear end portion of the lock body. It is characterized by having a linkage part having a hook shape that can be inserted into the box.

  A third aspect of the invention is the steering lock device according to the second aspect, further comprising cam means for pushing the hanger and moving the hanger from the unlocked position to the locked position while being held on the frame. It is characterized by.

  The invention according to claim 4 is the steering lock device according to claim 1 or 2, wherein the lock guide hole has a dimension in a direction along the rotation direction of the steering shaft of the front side opening portion on the back side. The enlarged part set larger than the dimension of the opening and the vicinity of the opening on the back side include a parallel part in which the dimension in the direction along the rotation direction of the steering shaft is set constant. .

  A fifth aspect of the present invention is the steering lock device according to the first or second aspect, wherein the small rectangular portion of the linkage receiving portion has a dimension in a direction along a rotation direction of the steering shaft. It is characterized by being set so as to gradually decrease toward the position side.

  According to the first aspect of the present invention, the distal end portion of the lock main body has a tapered shape, so that when the force in the rotational direction is applied to the steering shaft, the force applied to the lock member toward the unlocked position side Occurs and can be easily unlocked. In addition, when the rotational force is applied to the steering shaft all the time while the vehicle is parked and a component force is generated toward the unlocking position with respect to the lock member, the lock body is positioned at the locking position. However, when the steering shaft falls in the rotation direction of the steering shaft in the lock guide hole, the engaging portion engages with the flange portion, and movement of the lock body toward the unlocking position is restricted.

  Thus, the configuration without using the electric means can maintain the locked state without causing the battery to run out, and can easily unlock the steering lock during the unlocking operation.

  According to the invention of claim 2, since the hook is provided on the hanger, the hanger moves together with the lock main body to the unlocking position while the lock main body remains engaged with the hook. Sometimes it can be unlocked easily.

  According to the invention of claim 3, by providing the cam means for pushing the hanger and moving the hanger from the unlocked position to the locked position, when a force in the unlocking direction is applied to the lock body, the hanger is interposed. Since the cam means receives a force in the unlocking direction, it can receive the force in the unlocking direction without complicating the structure of the entire apparatus.

  According to the invention of claim 4, the lock guide hole has an enlarged portion in which the dimension of the front opening along the rotation direction of the steering shaft is set larger than the dimension of the rear opening. Thus, the lock main body easily falls in the locked state. Also, in the vicinity of the opening on the back side of the lock guide hole, a parallel part with a constant dimension along the rotation direction of the steering shaft is provided, so that it can be locked during the locking operation (transition from the unlocked state to the locked state). ) And during the unlocking operation (when shifting from the locked state to the unlocked state), the lock body can be moved vertically with respect to the steering shaft, and the steering lock can be surely performed.

  According to the invention of claim 5, for the small rectangular portion of the linkage receiving portion, the dimension in the direction along the rotation direction of the steering shaft is set so as to gradually decrease toward the unlocked position side. When the lock body rides on the shaft-side protruding part with the engagement part and the hook part disengaged, the rear end part of the lock body can easily enter a small rectangular part, improving operational reliability. To do.

1 is an exploded perspective view showing an electric steering lock device according to an embodiment of the present invention. It is a front view which shows one Embodiment of this invention and shows the state which removed the cover and the drive means. FIG. 3 is a schematic diagram showing a locked state according to an embodiment of the present invention, in a cross section taken along line III-III in FIG. 2. FIG. 3 is a schematic diagram showing a cross section taken along the line III-III in FIG. 2, showing a case where the lock main body falls down in the locked state of the embodiment of the present invention. It is the principal part enlarged view which showed the locking state of one Embodiment of this invention and expanded the VII part of FIG. FIG. 3 is a schematic diagram showing a state in the middle of the unlocking of the embodiment of the present invention, in a cross section taken along line III-III in FIG. 2. FIG. 3 is a schematic diagram showing the unlocked state of one embodiment of the present invention, in a cross section taken along line III-III in FIG. 2. FIG. 3 is a schematic diagram showing a state in the middle of locking according to an embodiment of the present invention, in a cross section taken along line III-III in FIG. 2. The unlocked state of one Embodiment of this invention is shown, (a) is sectional drawing along the IX-IX line of FIG. 2, (b) is the principal part enlarged view of (a). The unlocked state of one Embodiment of this invention is shown, (a) is sectional drawing along the XX line of FIG. 2, (b) is the principal part enlarged view of (a). The locked state of one Embodiment of this invention is shown, (a) is sectional drawing along the IX-IX line of FIG. 2, (b) is a principal part enlarged view of (a). The locked state of one Embodiment of this invention is shown, (a) is sectional drawing along the XX line of FIG. 2, (b) is a principal part enlarged view of (a). It is a schematic diagram which shows the electric steering lock device of a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The steering lock device of the present embodiment is attached to a steering column device 91 that houses a steering shaft 92 of an automobile as the electric steering lock device 1. As shown in FIGS. 1 to 12, the electric steering lock device 1 includes a frame 2 and a cover 3 that covers the front side of the frame 2, and the housing portion 21 of the frame 2 covered with the cover 3 includes The drive means 4, the worm wheel 5, and the lock member 6 are accommodated. In the locked state, the lock member 6 protrudes from the frame 2, and the distal end portion 62 a of the lock member 6 engages with a shaft side protrusion 93 provided on the steering shaft 92, thereby restricting the rotation of the steering shaft 92. Further, in the unlocked state, the lock member 6 is accommodated in the frame 2 and is separated from the steering shaft 92, so that the steering shaft 92 is allowed to rotate.

  The frame 2 includes an arc-shaped wheel receiving portion 22 in the accommodating portion 21, and the worm wheel 5 is rotatably disposed on an arc portion of the wheel receiving portion 22. Further, the wheel receiving portion 22 is provided with a wheel detachment preventing means 8. The frame 2 is formed with a lock guide hole 23 penetrating the housing portion 21 and the back surface side, and the lock member 6 is movably inserted into the lock guide hole 23. The lock guide hole 23 includes an enlarged portion 23c on the front side opening 23a side and a parallel portion 23d on the back side opening 23b side. The enlarged portion 23c is formed in a funnel shape in which the dimension of the front side opening 23a along the rotation direction of the steering shaft 92 is set larger than the dimension of the back side opening 23b, and the parallel part 23d In the vicinity of the side opening 23b, the dimension in the direction along the rotation direction of the steering shaft 92 (the interval between the opposing hole walls) is constant, and is inserted with a slight gap between the lock body 62 described later. It is set and the hole wall is parallel. Further, a bifurcated leg portion 24 projects from the back side of the frame 2 so as to straddle the steering column device.

  The cover 3 has a box shape with an opening on one side, and engages a locking portion 32 provided on the opening edge 31 with a locking receiving portion 26 provided on the periphery of the housing portion 21 of the frame 2. 3 is fixed to the frame 2.

  The drive unit 4 includes an electric motor 41 and a worm gear 43 assembled to the drive shaft 42 of the electric motor 41, and is disposed in the housing portion 21 of the frame 2 while being housed in the drive case 44. . Further, the drive case 44 is provided with a wheel accommodating portion 45, and the worm wheel 5 is accommodated therein.

  The worm wheel 5 has a substantially cylindrical shape, and is provided with a gear portion 51 that makes one round in the circumferential direction on the circumferential surface. The gear portion 51 is a gear that can mesh with the worm gear 43. On both sides of the gear portion 51, the cross-sectional shape is set to be circular, and the support portions 52 set to have a smaller diameter than the gear portion 51 are disposed adjacent to each other. The worm wheel 5 is assembled to the frame 2 together with the drive case 44 in a state where the gear portion 51 is engaged with the worm gear 43 and is accommodated in the wheel accommodating portion 45. In a state where the worm wheel 5 is assembled to the frame 2, the worm wheel 5 extends along the circumferential direction while being sandwiched between the arc-shaped support arc 46 provided in the wheel accommodating portion 45 and the arc portion of the wheel receiving portion 22. It is rotatably supported in the locking rotation direction R1 and the unlocking rotation direction R2 (the direction opposite to the locking rotation direction R1).

  Further, a cam projection 53 is integrally projected on one end face of the worm wheel 5 as cam means. The cam projection 53 includes an unlocking cam portion 54 and a locking cam portion 55, and is arranged in parallel so as to overlap the rotation surface of the worm wheel 5 in the order of the unlocking cam portion 54 and the locking cam portion 55 from the worm wheel 5 side. Is arranged.

  An unlocking cam surface 54a is provided on the circumferential surface of the unlocking cam portion 54 along the rotation direction of the worm wheel 5, and the locking cam portion 55 has a locking cam on the circumferential surface thereof along the rotation direction of the worm wheel 5. A surface 55a is provided.

  The cam profile of the unlocking cam surface 54a includes an unlocking holding portion 54b, a locking auxiliary portion 54d, and a gradual change portion 54c. The unlocking holding portion 54b is set to have a constant distance K from the rotation center O of the worm wheel 5 to the cam surface and to hold the lock member 6 moved to the unlocking position in the unlocking position. The locking assisting portion 54d is set to a dimension that makes the distance K constant and abuts an unlocking arm portion 61b described later so that the locking member 6 that has reached the locking position does not move further in the locking direction.

  The gradually changing portion 54c is set so that the distance K gradually changes as the worm wheel 5 rotates. In particular, the amount of change in the distance K with respect to the rotation of the worm wheel 5 is set to be small until the lock member 6 located at the locking position is separated from the shaft side protrusion 93 of the steering shaft 92. That is, the pulling torque is prioritized until the distal end 62a of the lock body 62, which will be described later, is separated from the shaft side protrusion 93, and the movement distance is prioritized after the distal end 62a is separated from the shaft side protrusion 93. It is set in the cam profile.

  The reason why the gradually changing portion 54c is set as described above is that the steering shaft 92 rotates during locking, and the distal end portion 62a of the lock main body 62 is engaged with the shaft side protruding portion 93 of the steering shaft 92. . In such a case, if the cam profile is set so that the amount of change in the distance K with respect to the rotation of the worm wheel 5 is constant, the lock main body 62 is pulled with the limited output of the electric motor 41 that is the drive source. There is a risk that it cannot be removed. Therefore, in order to reliably pull out the lock body 62 with the electric motor 41 having as small an output (size) as possible, the amount of change in the distance K with respect to the rotation of the worm wheel 5 is reduced to increase the pulling torque.

  The cam profile of the locking cam surface 55a includes a locking holding portion 55b, an unlocking assisting portion 55d, and a locking projection 55c. The lock holding part 55b is set to a dimension that holds the lock member 6 moved to the lock position at the lock position at a constant distance K. The unlocking assisting portion 55d is set to a dimension that makes the distance K constant and abuts the locking arm portion 61c so that the lock member 6 that has reached the unlocking position does not move further in the unlocking direction.

  The locking projection 55c is a corner set at the front end of the locking rotation direction R1 of the locking holding portion 55b. When the worm wheel 5 rotates in the locking rotation direction R1, the locking projection 55c slides the lock member 6 to the locking position while sliding on a locking arm portion 61c described later. After the locking member 6 reaches the locking position, the locking projection 55c is separated from the locking arm part 61c, the locking holding part 55b is positioned on the locking arm part 61c, and holds the locking member 6 in the locking position. .

  The lock member 6 includes a hanger 61, a lock main body 62, and a retracting spring 63. Further, the lock member 6 is disposed so as to be movable between a lock position and an unlock position set in the lock guide hole 23.

  The hanger 61 constitutes the rear end side of the lock member 6, and includes a base 61a formed along the direction along the lock guide hole 23 (slide direction S1), and a rear end side of the base 61a in the slide direction S1. An unlocking arm portion 61b extending in a slidable manner along the direction (orthogonal direction S2) perpendicular to the unlocking cam surface 54a, and along the orthogonal direction S2 on the distal end side of the base portion 61a And a locking arm portion 61c extending so as to be slidable on the locking cam surface 55a.

  The base 61a of the hanger 61 is provided with a linkage receiving portion 61d that is linked to a linkage portion 62b of the lock body 62 described later. The link receiving portion 61d is formed of a concave portion having a substantially convex cross section in which a large rectangular portion 61e located on the front end side and a small rectangular portion 61f located on the rear end side are combined. The dimension of the small rectangular portion 61f in the direction along the rotation direction of the steering shaft 92 is set so as to gradually decrease toward the unlocked position, and the linkage receiving portion 61d has a tapered convex shape. It has a recess. And the collar part 61g is set in the level | step-difference part of the large rectangular part 61e of the connection receiving part 61d, and the small rectangular part 61f. In addition, an inclined corner portion 61h that is set obliquely with respect to the sliding direction S1 is provided at the tip side corner portion of the large rectangular portion 61e.

  The unlocking arm portion 61b includes a contact point P1 between the unlocking arm portion 61b and the unlocking holding portion 54b of the unlocking cam surface 54a in the unlocked state in which the movement of the lock member 6 to the unlocking position is completed. A straight line L1 connecting the five rotation centers O is set to be parallel to the sliding direction S1. Further, with respect to the locking arm 61c, when the lock member 6 has been moved to the locking position, the contact P2 between the locking arm 61c and the locking holding portion 55b of the locking cam surface 55a, and the rotation of the worm wheel 5 A straight line L2 connecting the center O is set to be parallel to the slide direction S1.

  The lock main body 62 constitutes the front end side of the lock member 6, has a front end portion 62 a that engages with the shaft side protrusion 93 of the steering shaft 92 on the front end side, and a hook shape on the rear end side. A link part 62b that links with the part 61d is provided. The distal end portion 62a has a tapered shape, and the linkage portion 62b has a dimension that allows the large rectangular portion 61e and the small rectangular portion 61f constituting the linkage receiving portion 61d of the hanger 61 to move along the slide direction S1. Is set. Further, an engaging portion 62d that can engage with the flange portion 61g is provided at a corner portion at the rear end of the lock body 62 (corner portion on the rear end side of the linkage portion 62b). Furthermore, a return corner 62e set obliquely with respect to the sliding direction S1 is provided at the corner on the distal end side of the linkage portion 62b.

  The retraction spring 63 is compressed and sandwiched between the linkage receiving portion 61d of the hanger 61 and the linkage portion 62b of the lock body 62 inserted into the linkage receiving portion 61d, and the lock body 62 is attached to the distal end side by a compression reaction force. I hold the power. The lock main body 62 is biased and held toward the distal end side by the compression reaction force of the retraction spring 63, so that the flange portion 61 g of the hanger 61 is closer to the unlocking position than the engagement portion 62 d of the lock main body 62. To position.

  As shown in FIGS. 9 to 12, the wheel detachment preventing means 8 includes a detachment prevention projection 81 erected from the bottom surface of the housing portion 21 toward the center of rotation of the worm wheel 5 and having a tip bent in a hook shape. The wheel 5 is constituted by a disengagement prevention groove 82 formed along the rotation surface on the other end surface of the wheel 5. The detachment prevention groove 82 includes an attachment / detachment portion 82a that extends in the radial direction of the worm wheel 5, and an arc-shaped detachment prevention portion 82b that communicates with the attachment / detachment portion 82a and has a constant distance from the rotation center O. Each dimension is set so that the tip portion of the detachment prevention protrusion 81 moves in the grooves of the detachable portion 82a and the detachment prevention portion 82b. The detachable portion 82a is formed at a position facing the detachment preventing portion 82b when the worm wheel 5 is assembled from the front side of the accommodating portion 21 in the unlocked state.

  With such a configuration, in the unlocked state, the detachment prevention protrusion 81 can move in the attaching / detaching portion 82a, so that the worm wheel 5 can be attached to and detached from the wheel receiving portion 22, and in the locked state, the disengagement protrusion 82 can be detached. Since the prevention protrusion 81 is positioned in the disengagement prevention groove 82, the worm wheel 5 is prevented from being removed from the wheel receiving portion 22.

  Next, the assembly procedure of the electric steering lock device 1 will be described. First, the lock member 62 is assembled by assembling the lock body 62 to the hanger 61 while sandwiching the retracting spring 63. Next, the worm wheel 5 is housed in the wheel housing portion 45 in a state where the worm wheel 5 is disposed in the unlocked state while the drive means 4 is incorporated in the drive case 44. Then, the drive case 44 is installed in the housing portion 21 from the front side of the frame 2 while the lock member 6 assembled to the cam protrusion 53 of the worm wheel 5 housed in the wheel housing portion 45 is linked. Here, when installing the drive case 44, the tip end portion 81 a of the detachment prevention protrusion 81 is inserted into the attachment / detachment portion 82 a of the worm wheel 5. Then, the cover 3 is assembled to the frame 2 so as to cover the accommodating portion 21 from the front side of the frame 2.

  Next, the operation of the electric steering lock device 1 will be described. First, in the locked state, as shown in FIG. 3, the locking holding portion 55b of the locking cam surface 55a abuts on the locking arm portion 61c, while the locking auxiliary portion 54d of the unlocking cam surface 54a is on the unlocking arm portion 61b. Abut. In the locked state, a straight line L2 connecting the contact point P2 between the locking arm portion 61c and the locking holding portion 55b and the rotation center O of the worm wheel 5 is parallel to the sliding direction S1. In the locked state, the distal end portion 62a of the lock body 62 protrudes from between the leg portions 24 to the back side of the frame 2 and engages with the shaft side protrusion 93 of the steering shaft 92, thereby restricting the rotation of the steering shaft 92. To lock the steering wheel.

  Further, when a rotational force is applied to the steering shaft 92 in the locked state, the shaft-side protrusion 93 pushes the distal end portion 62a of the lock body 62 as shown in FIGS. The lock main body 62 falls down around 23d. Further, when the shaft-side protrusion 93 pushes the tapered tip 62a, a component force in the unlocking direction is applied to the lock main body 62, the lock main body 62 moves to the unlocking position side, and the engaging portion 62d. Engages with the flange 61g. When the engaging portion 62d is engaged with the flange portion 61g, the component force in the unlocking direction applied to the distal end portion 62a of the lock body 62 is applied to the worm wheel 5 via the hanger 61, and the worm wheel 5 is attached to the frame 2. Dispersed in the drive case 44 held on the wheel and the wheel detachment preventing means 8. With such a configuration, even when a rotational force is applied to the steering shaft 92 in the locked state, the movement of the lock body 62 toward the unlocked position is restricted.

  When shifting from the locked state to the unlocked state, the electric motor 41 causes the worm wheel 5 to rotate in the unlocking rotation direction R2, and the gradually changing portion 54c of the unlocking cam surface 54a slides on the unlocking arm portion 61b. The locking cam surface 55a is separated from the locking arm portion 61c while being in contact. When the worm wheel 5 further rotates in the unlocking rotation direction R2, as shown in FIG. 6, the distance K of the gradually changing portion 54c gradually increases, and the unlocking cam surface 54a slides the lock member 6 in the unlocking direction. , Transition to the unlocked state. At this time, the lock body 62 moves to the unlocking position together with the hanger 61 in a state where the lock body 62 is tilted, that is, the engagement portion 62d and the flange portion 61g are engaged. Since the lock body 62 that has fallen is caught by the parallel portion 23d of the lock guide hole 23, the engagement between the engagement portion 62d and the flange portion 61g is released, and the lock body 62 is in a state perpendicular to the steering shaft 92. Returned. Further, when the distal end portion 62 a of the lock body 62 is separated from the shaft-side protrusion 93 by the unlocking operation, there is no force to tilt the lock body 62 from the steering shaft 92, and the lock spring 62 is locked by the compression reaction force of the retraction spring 63. The main body 62 moves in the direction of the locking position. By this movement, the engagement between the engaging portion 62d and the flange portion 61g is released, and the return angle portion 62e of the linkage portion 62b moves on the slope of the inclined angle portion 61h of the linkage receiving portion 61d. The state is returned to the state perpendicular to the steering shaft 92.

  Even if the engagement between the engaging portion 62d and the flange portion 61g is not released during the unlocking operation, the lock main body 62 is released when the parallel portion 23d is inserted during the locking operation, and the lock main body 62 is moved to the steering shaft. It is returned to the state perpendicular to 92. In other words, the engagement margin between the flange portion 61g and the engaging portion 62d provides a sufficient resistance against the component force applied to the unlocking position on the lock body 62, and the lock member 6 slides along the slide direction S1. In this case, the engagement between the flange portion 61g and the engaging portion 62d is set to be released.

  In the unlocked state, as shown in FIG. 7, the unlocking holding portion 54b of the unlocking cam surface 54a abuts on the unlocking arm portion 61b, and the unlocking assisting portion 55d of the locking cam surface 55a is locked to the locking arm portion 61c. It is in contact with the top. In the unlocked state, a straight line L1 connecting the contact point P1 between the unlocking arm portion 61b and the unlocking holding portion 54b and the rotation center O of the worm wheel 5 is parallel to the slide direction S1. In the unlocked state, the lock member 6 is accommodated in the lock guide hole 23, and the distal end portion 62a is separated from the steering shaft 92. Therefore, the unlocked state in which the rotation of the steering shaft 92 is allowed.

  When shifting from the unlocked state to the locked state, the electric motor 41 causes the worm wheel 5 to rotate in the locking rotation direction R1, and the unlocking cam surface 54a is separated from the unlocking arm portion 61b. Further, when the worm wheel 5 rotates in the locking rotation direction R1, the locking member 55 slides on the locking arm portion 61c while the locking projection 55c of the locking cam surface 55a slides on the locking arm portion 61c. After the lock member 6 reaches the locking position, the locking projection 55c is separated from the locking arm 61c, and the unlocking cam surface 54a is unlocked while the locking holding portion 55b is positioned on the locking arm 61c. It is located on the arm part 61b and shifts to the locked state.

  Further, when the tip 62a of the lock body 62 gets on the shaft-side protrusion 93 of the steering shaft 92 during the movement from the unlocked position to the locked position, as shown in FIG. The retracting spring 63 is compressed while the 61 continues to move to the locking position side, and the rear end portion (linking portion 62b) of the lock body 62 moves from the large rectangular portion 61e of the linkage receiving portion 61d to the small rectangular portion 61f. The lock member 6 contracts. Then, when the steering shaft 92 rotates and the shaft side protrusion 93 moves, the retracting spring 63 expands and the lock body 62 moves to the locking position, and the tip end portion 62a engages with the shaft side protrusion 93. Then, the rotation of the steering shaft 92 is restricted (see FIG. 3).

  From the above, since the distal end portion of the lock main body 62 has a tapered shape, a component force toward the unlocking position is applied to the lock member 6 in a state where a rotational force is applied to the steering shaft 92. Generated and can be easily unlocked.

  Further, in a state where a force in the rotational direction is applied to the steering shaft 92 while the vehicle is parked and a component force is generated toward the unlocking position with respect to the lock member 6, the lock body 62 is locked. When the steering shaft 92 is tilted in the rotation direction of the steering shaft 92 in the lock guide hole 23 while being in the position, the engaging portion 62d is engaged with the flange portion 61g, and the movement of the lock body 62 toward the unlocking position is restricted. The

  With such a configuration that does not use electrical means, the locked state can be maintained without causing battery exhaustion, and can be easily unlocked during the unlocking operation.

  Since the hook 61g is provided on the hanger 61, the hanger 61 is moved to the unlocking position together with the lock body while the lock main body 62 is engaged with the hook 61g. Can be locked.

  Since the worm wheel 5 is provided with the locking cam portion 55 that pushes the hanger 61 to move the hanger 61 from the unlocked position to the locked position, when the force in the unlocking direction is applied to the lock body 62, Since the worm wheel 5 receives a force in the unlocking direction via the locking cam portion 55, the force in the unlocking direction can be received without complicating the structure of the entire apparatus.

  The lock guide hole 23 is provided with an enlarged portion 23c in which the dimension of the front side opening 23a along the rotation direction of the steering shaft 92 is set to be larger than the dimension of the back side opening 23b. As a result, the lock main body 62 easily falls. Further, in the vicinity of the opening 23b on the back surface side of the lock guide hole 23, a parallel part 23d having a constant dimension along the rotational direction of the steering shaft 92 is provided, so that the locking operation can be performed (from the unlocked state). The lock body 62 can be moved vertically with respect to the steering shaft 92 during the unlocking operation (when shifting to the locked state) and during the unlocking operation (when shifting from the locked state to the unlocked state), so that the steering lock can be reliably performed.

  The small rectangular portion 61f of the linkage receiving portion 61d is set so that the dimension in the direction along the rotation direction of the steering shaft 92 is gradually reduced toward the unlocking position side. When the lock main body 62 rides on the shaft side protrusion 93 in the state where the engagement with the portion 61g is released, the linkage portion 62b of the lock main body 62 can easily enter the small rectangular portion 61f, and the operation reliability is improved. To do.

  Further, since no parts such as a sensor are required, the movement of the lock body 62 toward the unlock position can be restricted without increasing the manufacturing cost.

  In the present embodiment, the parallel portion 23d is set in the vicinity of the rear surface side opening portion 23b, but the tilted lock main body 62 slides to be in a state perpendicular to the steering shaft 92 (in the sliding direction S1). If it is returned to the parallel state), the dimension of the parallel portion 23d along the slide direction S1 may be extremely short or may be a shape like a throttle portion. Moreover, you may comprise a parallel part by several protrusion arrange | positioned spaced apart in the sliding direction S1.

  Further, in the present embodiment, during the locking operation, the locking cam portion 55 pushes the locking arm portion 61c to move the lock member 6 to the locking position, and during the unlocking operation, the unlocking cam portion 54 is unlocked. The lock member 6 is moved to the unlocked position by pushing 61b. During the locking operation, the cam pushes the hanger to move the lock member to the locked position, and during the unlocking operation, the biasing means. A configuration in which the hanger is pressed against the cam by the urging force to move to the unlocking position may be used. Even in such a case, when a component force in the unlocking direction is applied to the lock body, the component force in the unlocking direction can be distributed to the frame via the cam.

  Further, the cam means may be not only the worm wheel 5 rotating as in the present embodiment but also linearly sliding, and even when the cam means is slid, the cam means is the hanger 61 during the locking operation. If it is the structure which pushes and moves to a locking position, the same effect is obtained.

  Furthermore, the hook 61g is provided not in the hanger 61 but in the lock guide hole 23 of the frame 2, and when the hanger 61 moves in the unlocking position direction, the engagement between the engaging part 62d and the hook 61g is released. However, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Electric steering lock device 2 ... Frame 4 ... Drive means 5 ... Worm wheel (cam means)
6 ... Lock member 23 ... Lock guide hole 23a ... Front side opening 23b ... Back side opening 23d ... Parallel part 61 ... Hanger 61d ... Linkage receiving part 61e ... Large rectangular part 61f ... Small rectangular part 61g ... Ridge part 62 ... Lock Main body 62b ... Linking part (rear end part)
62d ... engaging portion 92 ... steering shaft 93 ... shaft side protrusion

Claims (5)

A lock guide hole penetrating the front side and the back side of the frame;
A lock main body which is disposed so as to be movable between a lock position and an unlock position set in the lock guide hole, and has a tapered shape with a tapered tip portion;
An engaging portion provided in the lock body;
A hook portion projecting into the lock guide hole on the unlocking position side of the engagement portion located at the locking position;
When the lock body falls in the rotation direction of the steering shaft in the lock guide hole with the lock body positioned at the lock position, the engagement portion engages with the flange portion, and the lock body is unlocked to the unlock position side. Steering lock device characterized in that movement to is restricted. The steering lock device according to claim 1,
A hanger that is linked to the lock body and is arranged to be movable between the lock position and the unlock position together with the lock body;
A biasing spring sandwiched between the hanger and the lock body and biasing the lock body toward the locking position;
The hanger includes a link receiving portion having a substantially convex cross section in which a large rectangular portion and a small rectangular portion are combined,
The collar portion is set at a step portion between a large rectangular portion and a small rectangular portion of the linkage receiving portion,
A steering lock device comprising a linkage portion having a hook shape in which a front end portion can be inserted into the linkage receiving portion at a rear end portion of the lock body. The steering lock device according to claim 2,
A steering lock device comprising cam means for pushing the hanger while moving the hanger from the unlocked position to the locked position while being held on the frame. The steering lock device according to claim 1 or 2,
The lock guide hole is
An enlarged portion in which the dimension of the front side opening along the rotation direction of the steering shaft is set larger than the dimension of the back side opening,
A steering lock device including a parallel portion in which a dimension in a direction along a rotation direction of the steering shaft is set to be constant in the vicinity of the opening on the back side. The steering lock device according to claim 1 or 2,
The steering lock device according to claim 1, wherein the small rectangular portion of the linkage receiving portion is set such that a dimension in a direction along a rotation direction of the steering shaft is gradually reduced toward the unlocking position side.

Images