WO2012147543A1

WO2012147543A1 - Steering lock device

Info

Publication number: WO2012147543A1
Application number: PCT/JP2012/060212
Authority: WO
Inventors: 浩一朗杉本
Original assignee: 株式会社アルファ
Priority date: 2011-04-26
Filing date: 2012-04-16
Publication date: 2012-11-01
Also published as: JP2012228940A; JP5731889B2

Abstract

A steering lock device (1) is provided with: a lock guide hole (23) penetrating through a frame (2); a lock body (62) having a tapered front end and provided so as to be movable between a locking position and an unlocking position which are set within the lock guide hole (23); and an eaves section (61g) protruding to the inside of the lock guide hole (23) and provided further toward the unlocking position side than the engagement section (62d) of the lock body (62) located at the locking position. When the lock body (62) falls within the lock guide hole (23) in the direction of rotation of the steering shaft while the lock body (62) is located at the locking position, the engagement section (62d) engages with the eaves section (61g) to prevent the lock body (62) from moving to the unlocking position side.

Description

Steering lock device

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

As such a related steering lock device, one disclosed in Patent Document 1 is known. FIG. 1 shows a configuration of a steering lock device 101 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. And 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. The lock groove 194 of the key lock collar 193 and the end of the lock member 106 engaged with the lock groove 194 are 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 vibration sensor 111 detects vibration applied to the steering shaft in the locked state where the lock member 106 is positioned 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. 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 and the lock member 106 is difficult to come off. However, by providing a 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, a rotational force is applied to the key lock collar 193 through the tire from the road surface. When releasing the steering lock, a component force is generated on the lock member 106 toward the unlock position, and the lock member 106 can be easily pulled out.

In the locked state, when the vibration sensor 111 detects abnormal vibration, 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 related steering lock device 101 described above, when the vehicle is parked with the steering wheel turned off, the force in the rotational direction is applied to the steering shaft by the reaction force from the tires while it is parked, and the lock member A component force to the unlocking position side is generated at 106. For this reason, in order to cancel out the generated component force, the electric motor 104 must be continuously operated, which may cause the battery to run out.

An object of the present invention is to provide a steering lock device that can easily release the steering lock during the unlocking operation while maintaining the locked state without causing the battery to run out.

The aspect of the present invention is provided with a lock guide hole penetrating the front side and the back side of the frame, movable between a lock position and an unlock position set in the lock guide hole, and a tip portion is provided. A lock body having a tapered shape, wherein the lock body has an engagement portion, and the lock guide is provided closer to the unlocking position than the engagement portion of the lock body located at the locking position. A hook part projecting into the hole, 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 part is the hook part. The gist of the present invention is a steering lock device that engages with a portion and is restricted from moving the lock body toward the unlocked position.

According to the above aspect, the distal end portion of the lock body has a tapered shape, so that when a force in the rotational direction is applied to the steering shaft, a component force is generated on the lock member toward the unlock position. And can be easily unlocked. In a state where a rotational force is applied to the steering shaft while the vehicle is parked and a component force is generated toward the unlocking position with respect to the locking member, the lock body is positioned at the locking position, By tilting in the rotation direction of the steering shaft within the lock guide hole, the engaging portion engages with the flange portion, and movement of the lock body toward the unlocked position is restricted.

Such a configuration that does not use electrical means can maintain the locked state without causing the battery to run out, and can easily unlock the steering lock during the unlocking operation.

Further, the steering lock device is linked to the lock body, and is arranged between the hanger and the lock body, and a hanger that is movable with the lock body between the lock position and the unlock position. A biasing spring that is sandwiched and biases the lock body toward the locking position may be provided. The hanger includes a linkage receiving portion having a convex cross section formed by combining a first rectangular portion and a second rectangular portion smaller than the first rectangular portion, and the flange portion is the linkage receiving portion. The lock main body has a linkage portion having a hook shape in which a front end portion can be inserted into the linkage receiving portion at a step portion between the first rectangular portion and the second rectangular portion. May be.

According to the above configuration, the buttock is provided on the hanger. As a result, the hanger moves to the unlocking position together with the lock main body while the lock main body remains engaged with the collar portion, so that it can be easily unlocked during the unlocking operation.

In addition, the steering lock device may include a cam portion that pushes the hanger and moves the hanger from the unlocked position to the locked position while being held on the frame.

According to the above configuration, the cam portion is provided to push the hanger and move the hanger from the unlocked position to the locked position. As a result, when a force in the unlocking direction is applied to the lock body, the cam part receives a force in the unlocking direction via the hanger, so that the structure of the entire device can be unlocked without complicating the structure. Can receive force in the direction.

In addition, the lock guide hole is provided in the vicinity of the opening on the back surface side, the parallel portion having a constant dimension in the direction along the rotation direction of the steering shaft, and the opening on the front side. You may have the expansion part by which the dimension of the direction along the rotation direction of a steering shaft was set larger than the dimension of the said opening part on the said back surface side.

According to the above configuration, the lock guide hole includes the enlarged portion in which the dimension of the opening on the front side along the rotation direction of the steering shaft is set larger than the dimension of the opening on the back side. As a result, the lock body easily falls in the locked state. In the vicinity of the opening on the back surface side of the lock guide hole, there is provided a parallel portion in which the dimension in the direction along the rotation direction of the steering shaft is set constant. This allows the lock body to move vertically with respect to the steering shaft during the locking operation (when shifting from the unlocked state to the locked state) and during the unlocking operation (when shifting from the locked state to the unlocked state) Steering lock can be ensured.

Further, the second rectangular portion of the linkage receiving portion may be set such that the dimension in the direction along the rotation direction of the steering shaft gradually decreases toward the unlocked position.

According to the above configuration, the dimension of the second rectangular portion of the linkage receiving portion in the direction along the rotation direction of the steering shaft is set so as to gradually decrease toward the unlocking position side. As a result, when the lock main body rides on the shaft side protrusion with the engagement portion and the hook portion disengaged, the rear end portion of the lock main body easily enters the second rectangular portion. Reliability is improved.

FIG. 1 is a schematic diagram showing a related electric steering lock device. FIG. 2 is an exploded perspective view showing an electric steering lock device according to an embodiment of the present invention. FIG. 3 is a front view showing an embodiment of the present invention and showing a state where a cover and a drive unit are removed. FIG. 4 is a schematic diagram showing a locked state according to an embodiment of the present invention and a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a schematic diagram showing a cross section taken along line IV-IV in FIG. 3, showing a case where the lock main body falls down in the locked state of the embodiment of the present invention. FIG. 6 is an enlarged view of a main part, showing the locked state of one embodiment of the present invention, in which the VI part of FIG. 5 is enlarged. FIG. 7 is a schematic diagram showing a cross-section taken along line IV-IV in FIG. FIG. 8 shows an unlocked state of one embodiment of the present invention, and is a schematic view in a section taken along line IV-IV in FIG. FIG. 9 is a schematic diagram showing a cross-section taken along line IV-IV in FIG. 10 shows an unlocked state of one embodiment of the present invention, FIG. 10 (a) is a cross-sectional view taken along line XX of FIG. 3, and FIG. 10 (b) is a main part of FIG. 10 (a). It is an enlarged view. 11 shows an unlocked state of one embodiment of the present invention, FIG. 11 (a) is a cross-sectional view taken along line XI-XI in FIG. 3, and FIG. 11 (b) is a main portion of FIG. 11 (a). It is an enlarged view. 12 shows a locked state of one embodiment of the present invention, FIG. 12 (a) is a cross-sectional view taken along line XX of FIG. 3, and FIG. 12 (b) is an enlarged view of the main part of FIG. 12 (a). FIG. 13 shows a locked state of one embodiment of the present invention, FIG. 13 (a) is a cross-sectional view taken along the line XI-XI in FIG. 3, and FIG. 13 (b) is an enlarged view of the main part of FIG. FIG.

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. 2 to 13, the electric steering lock device 1 includes a frame 2 and a cover 3 that covers the front side of the frame 2. The drive unit 4, the worm wheel 5, and the lock member 6 are stored in the storage unit 21 of the frame 2 covered with the cover 3. 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. 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. The worm wheel 5 is rotatably disposed on the arc portion of the wheel receiving portion 22. The wheel receiving portion 22 is provided with a wheel detachment preventing portion 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 opening 23a along the rotation direction of the steering shaft 92 is set larger than the dimension of the rear opening 23b. The parallel portion 23d has a constant dimension in the direction along the rotational direction of the steering shaft 92 (the interval between the opposed hole walls) in the vicinity of the back surface side opening portion 23b, and a slight gap between the parallel portion 23d and the lock body 62 described later. It is set to be inserted through and the hole walls are parallel. A bifurcated leg portion 24 projects from the back side of the frame 2 so as to straddle the steering column device 91.

The cover 3 has a box shape with one side opened, and a locking portion 32 is provided on the opening edge 31. The cover 3 is fixed to the frame 2 by engaging the engaging portion 32 of the cover 3 with the engaging receiving portion 26 provided on the periphery of the accommodating portion 21 of 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 unit 21 of the frame 2 while being housed in the drive case 44. . The drive case 44 is provided with a wheel accommodating portion 45 in which the worm wheel 5 is accommodated.

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).

As a cam portion, a cam protrusion 53 is integrally projected on one end face of the worm wheel 5. 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. Has been placed.

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 body 62, and a retracting spring 63. 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 is formed in a substantially U shape with a base 61a, an unlocking arm 61b, and a locking arm 61c. The base 61a constitutes the rear end side of the lock member 6 and is formed along a direction along the lock guide hole 23 (slide direction S1). The unlocking arm portion 61b is provided on the rear end side of the base portion 61a so as to be slidable on the unlocking cam surface 54a along a direction orthogonal to the sliding direction S1 (orthogonal direction S2). . The locking arm portion 61c extends on the distal end side of the base portion 61a so as to be slidable on the locking cam surface 55a along the orthogonal direction S2.

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 has a substantially convex cross section in which a large rectangular portion (first rectangular portion) 61e located on the front end side and a small rectangular portion (second rectangular portion) 61f located on the rear end side are combined. It is comprised by the recessed part. 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 unlocking position, and the linkage receiving portion 61d is a concave portion having a tapered convex shape. It has become. A flange portion 61g is set at a step portion between the large rectangular portion 61e and the small rectangular portion 61f of the linkage receiving portion 61d. An inclined corner portion 61h 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. As for the locking arm portion 61c, the contact P2 between the locking arm portion 61c and the locking holding portion 55b of the locking cam surface 55a and the rotation center O of the worm wheel 5 in the locked state in which the lock member 6 has been moved to the locking position. Is set to be parallel to the slide direction S1.

The lock main body 62 includes a tip end portion 62a and a linkage portion 62b. The distal end portion 62 a constitutes the distal end side of the lock member 6 and engages with the shaft side protrusion 93 of the steering shaft 92. The linkage part 62 b is formed in a hook shape on the rear end side of the lock member 6 and linked to the linkage receiving part 61 d of the hanger 61. The distal end portion 62a has a tapered shape. The linking part 62b is set to a dimension that allows the large rectangular part 61e and the small rectangular part 61f constituting the linking receiving part 61d of the hanger 61 to be moved along the sliding direction S1. 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). 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. Since the lock main body 62 is biased and held toward the distal end side by the compression reaction force of the retraction spring 63, the flange portion 61g of the hanger 61 is positioned closer to the unlocking position than the engaging portion 62d of the lock main body 62. .

As shown in FIGS. 10 to 13, the wheel detachment preventing portion 8 is erected from the bottom surface of the housing portion 21 toward the rotation center of the worm wheel 5, and the detachment preventing projection 81 whose tip is 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 accommodated in the wheel accommodating portion 45 in a state where the worm wheel 5 is disposed in the unlocked state while the drive portion 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. 4, the locking holding portion 55b of the locking cam surface 55a is in contact with 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 front end 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 to restrict the rotation of the steering shaft 92. Then, lock the steering.

When a rotational force is applied to the steering shaft 92 in the locked state, as shown in FIGS. 5 and 6, the shaft-side protrusion 93 pushes the tip 62 a of the lock body 62, thereby The lock body 62 falls over in the center. 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 upper side and the wheel detachment prevention unit 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. 7, 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 main body 62 moves to the unlocking position together with the hanger 61 while the lock main body 62 is tilted, that is, with the engaging portion 62d and the flange portion 61g being engaged. During this movement, the lock body 62 that has fallen down is caught by the parallel portion 23d of the lock guide hole 23, so that the engagement between the engagement portion 62d and the flange portion 61g is released, and the lock body 62 is moved to the steering shaft 92. It is returned to a state perpendicular to. 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 attached to the steering shaft 92. On the other hand, it is returned to the vertical state. 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. 8, the unlocking holding portion 54b of the unlocking cam surface 54a is in contact with 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, since the lock member 6 is accommodated in the lock guide hole 23 and the tip end portion 62a is separated from the steering shaft 92, 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.

FIG. 9 shows a case where the tip end portion 62a of the lock main body 62 rides on the shaft-side protrusion 93 of the steering shaft 92 while moving from the unlocking position to the locking position. In this case, the retracting spring 63 is compressed while the hanger 61 continues to move toward the locking position, and the rear end portion (linking portion 62b) of the lock body 62 is smaller than the large rectangular portion 61e of the linkage receiving portion 61d. It moves to the rectangular part 61f and 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. 4).

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.

In a state where a rotational force 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 positioned at the locking position. However, the steering shaft 92 falls in the rotation direction within the lock guide hole 23. Thereby, the engaging part 62d engages with the flange part 61g, and the movement of the lock main body 62 toward the unlocking position is restricted.

Such a configuration that does not use electrical means can maintain the locked state without causing the battery to run out 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.

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

The lock guide hole 23 includes 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 larger than the dimension of the back side opening 23b. As a result, the lock main body 62 easily falls down in the locked state. In the vicinity of the opening 23b on the back surface side of the lock guide hole 23, there is provided a parallel portion 23d in which the dimension in the direction along the rotation direction of the steering shaft 92 is set constant. As a result, the lock body 62 moves vertically with respect to the steering shaft 92 during the locking operation (when shifting from the unlocked state to the locked state) and during the unlocking operation (when shifting from the locked state to the unlocked state). The steering lock can be ensured.

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 gradually decreases toward the unlocked position. Thereby, when the lock main body 62 rides on the shaft side protrusion 93 in a state where the engagement between the engagement portion 62d and the flange portion 61g is released, the linkage portion 62b of the lock main body 62 is changed to a small rectangular portion 61f. It becomes easier to enter and the operational reliability is improved.

Since parts such as a sensor are not required, the movement of the lock body 62 toward the unlock position can be regulated without increasing the manufacturing cost.

In the present embodiment, a parallel portion 23d is set in the vicinity of the back surface side opening 23b. However, if the fallen lock body 62 slides and returns to a state perpendicular to the steering shaft 92 (a state parallel to the slide direction S1), the dimension of the parallel portion 23d along the slide direction S1 is It may be extremely short or may have a shape like a diaphragm. Moreover, you may comprise the parallel part 23d by the some protrusion arrange | positioned spaced apart in the slide direction S1.

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 moves the unlocking arm portion 61b. By pushing, the lock member 6 is moved to the unlocked position. However, at the time of locking operation, the cam pushes the hanger to move the lock member to the locking position, and at the time of unlocking operation, it is moved to the unlocking position by pressing the hanger against the cam by the biasing force of the biasing means. Also good. 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.

The cam portion may be not only the rotating worm wheel 5 as in the present embodiment but also a linear sliding member, and even if the cam portion slides, the cam portion pushes the hanger 61 during the locking operation. If it is the structure which moves to a locking position, the same effect is obtained.

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. The same effect can be obtained.

As mentioned above, although it demonstrated based on embodiment of this invention, this invention is not limited to this, The structure of each part can be substituted to the thing of the arbitrary structures which have the same function.

Claims

A lock guide hole penetrating the front side and the back side of the frame;
A lock body having a taper shape with a tapered tip provided in a movable manner between a locking position and an unlocking position set in the lock guide hole, and a lock body having an engagement portion;
A hook portion that is provided closer to the unlocking position than the engagement portion of the lock body located at the locking position, and protrudes into the lock guide hole,
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 engages with the flange portion, and the unlocking position of the lock body Steering lock device that is restricted from moving sideways.
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 that is sandwiched between the hanger and the lock body and biases the lock body toward the locking position;
The hanger has a link receiving portion having a convex cross section formed by combining a first rectangular portion and a second rectangular portion smaller than the first rectangular portion,
The collar portion is provided at a step portion between the first rectangular portion and the second rectangular portion of the linkage receiving portion,
2. The steering lock device according to claim 1, wherein the lock main body has a linkage portion having a hook shape in which a tip end portion can be inserted into the linkage receiving portion at a rear end portion.
3. The steering lock device according to claim 2, further comprising a cam portion that pushes the hanger and moves the hanger from the unlocked position to the locked position while being held on the frame.
The lock guide hole is
A parallel portion provided in the vicinity of the opening on the back side, the dimension of the direction along the rotation direction of the steering shaft being set constant;
The enlarged portion in which the dimension in the direction along the rotation direction of the steering shaft of the opening on the front side is set larger than the dimension of the opening on the back side. Steering lock device.
The steering lock according to claim 2, wherein the second 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. apparatus.