JP3115976B2 - Steering lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved steering lock device for locking a steering shaft during parking to prevent theft.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are schematic views showing an example of a conventional steering lock device. Reference numeral 1 denotes a cylinder inner having a key hole, and reference numeral 2 denotes a cylinder outer that rotatably holds the cylinder inner 1. The cylinder inner 1 and the cylinder outer 2 constitute a well-known cylinder lock 3. Reference numeral 4 denotes a cam member connected to the cylinder inner 1. When a key (not shown) is inserted into the cylinder inner 1 and rotated, the cam member 4 rotates together, and the rotor of the ignition switch 5 provided coaxially is rotated. By rotating, a predetermined switch operation is performed.

[0003] 7 is a lock shaft, 7a is its operation piece,
8 is a lock spring for urging the lock shaft 7,
Reference numeral 8a denotes a lid used for attaching the spring 8, and 9 denotes a body for accommodating the above members. When the key is removed at the lock position, the lock shaft 7 is pushed by the spring 8 until the operation piece 7a comes into contact with the cam member 4,
It is configured to project in the direction of an upper steering shaft (not shown) to lock the steering shaft.

[0004] On the other hand, a groove 2a is formed in the cylinder outer 2 along the axial direction to accommodate a lock link 11, which is swingably supported by a support shaft 12 movable in the radial direction. The lock link 11 has a key sensing end 11a at one end in contact with a key sensing member 1a provided on the cylinder inner 1, and a locking end 11b at the other end capable of abutting on the lock shaft 7. When the key is inserted into the key 1, the key sensing end 11 a is opposed to the spring 13.
Is pressed, and the cam member 4 is operated by the operation piece 7a with the rotation of the key.
, The lock shaft 7 is immersed in the body 9, and the steering lock is released. Further, the locking end 11b engages with the locking groove 7b of the lock shaft 7, and the unlocked state of the steering is maintained.

In the above-described configuration, the locked state of the steering is maintained by the lock shaft 7 being pushed by the lock spring 8, and when the lid 8a is removed, the urging force of the spring 8 is lost and the lock state is maintained. The state is released. For this reason, in order to ensure the anti-theft function, it is necessary to make the lid 8a and its mounting structure strong so that the lid 8a is not easily broken or removed. Therefore, there is a limit to the prevention of theft, and this also contributes to an increase in cost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and has been made to provide a more reliable anti-theft function while avoiding an increase in cost.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is configured to lock a steering shaft by projecting a lock shaft toward a steering shaft in accordance with removal of a key at a lock position. In the steering lock device, the lock shaft is engaged with the lock shaft via an engagement portion forming a cam mechanism, and when the lock shaft is turned to the lock position by a key operation, the lock shaft projects in the steering shaft side. A cam member that is driven and driven in a direction of immersion into the body when rotating from the lock position to the on position direction, a biasing spring that biases the cam member in the lock position direction, and the cam when the key is inserted. A lock link that locks the cam member to the locked position by locking to the member. When the lock link is unlocked from the cam member when it is rotated to the lock position and pulled out, the cam member is rotated to the lock position by the urging force of the urging spring so that the lock shaft projects toward the steering shaft. Make up.

The engagement portion between the lock shaft and the cam member is constituted by, for example, a combination of a pin provided on the lock shaft and a groove provided on an end face of the cam member. It is formed in such a shape that the pin is moved in the outer peripheral direction at the time of turning to. It is desirable that the above-mentioned groove has a shape in which an outer peripheral end is formed in a circumferential direction.

[0009]

According to the present invention, the lock spring mounted in the body by the lid is not used, the lock shaft is directly driven by the cam member via the engaging portion, and the locked state of the steering is controlled by the cam member. It is maintained by a spring that urges the cylinder inner toward the lock position. Therefore, there is no lid or locking spring attached to the body by this lid, and the locked state cannot be released even if the part corresponding to the lid is destroyed, and only by slightly changing the shape and structure of the member The anti-theft function is improved without increasing the cost.

[0010]

Next, one embodiment shown in the drawings will be described. FIG.
2 is a schematic sectional view, FIG. 2 is an exploded perspective view of a main part, and FIG. 3 is an operation explanatory view. The same parts as those in FIGS. 4 and 5 are denoted by the same reference numerals.

In this embodiment, the cam members 4 are a cam inner 21 as a first cam and a cam outer 2 as a second cam.
2, each having a nested structure. As shown in FIG. 2, the cam inner 21 is a shaft having a connecting portion 21a with the cylinder inner 1, a connecting portion 21b with the ignition switch 5, a key member 21c, and the like. The cam outer 22 has a two-stage shape having a large-diameter portion 22a and a small-diameter portion 22b, and has an insertion hole 22c for the cam inner 21 at the center and a cutout 22d in a predetermined range on the outer periphery of the small-diameter portion 22b. The insertion hole 22c is provided with a fan-shaped key groove 22e.

Reference numeral 23 denotes a torsion spring provided to constantly urge the cam member 4 (the cam outer 22 in this embodiment) toward the lock position with respect to the cylinder inner.
The cam outer 22 is housed in a recess 22 f formed on the end face on the ignition switch 5 side, and one end 23 a is connected to the recess 2.
The other end 23b is locked to the key member 21c of the cam inner 21 by the locking portion 22g of 2f, respectively. Reference numeral 24 denotes an engagement portion between the lock shaft 7 and the cam member 4, a pin 25 protruding from the lower end of the lock shaft 7 toward the cam outer 22, and a corresponding ignition switch of the cam outer 22. Groove 26 formed on the end face on the 5th side
It is composed of

As shown in FIG. 2, the groove 26 of the engaging portion 24 is an inner end portion 26a formed in a small-diameter arc around the center axis of the cam outer 22, and a position rotated counterclockwise from the inner end portion 26a. Similarly, a large-diameter outer peripheral end portion 26b formed in an arc shape, that is, in a direction parallel to the circumference, and an inclined portion 26 for smoothly connecting between both end portions 26a, 26b.
c, and is formed outside the recess 22f over a rotation range of about 135 degrees. The engagement portion 24 converts the rotation of the cam outer 22 into a linear movement of the lock shaft 7. When the cam outer 22 is rotated, the pin 25 moves in the groove 26. Numeral 25 moves in the outer peripheral direction.

The shapes of the above members and the mutual positional relationship in the assembled state are selected so that the desired operation described below is performed without any trouble. The operation will be described. FIG. 3 shows the mutual relationship among the locking end 11b of the lock link 11, the cam inner 21, the cam outer 22, the spring 23, and the lock shaft 7, and the key insertion side, that is, FIG.
Is a view from the right side of FIG. 1, but all members are drawn by solid lines for convenience.

FIG. 3A shows a state where the key is removed from the cylinder inner 1 at the lock position and the steering shaft is locked, FIG. 3B shows a state where the key is inserted at this position, and FIG. ) Is the state when the key is turned from the state of (b) to the ACC position and the lock is released, and (d) is
The state where the key is turned again from the state of (c) to the lock position is shown.

In FIG. 1A, the cam outer 22 is rotated most counterclockwise, the pin 25 is located at the outer peripheral end 26b of the groove 26, and the lock shaft 7 is pushed upward, not shown. It protrudes in the direction of the steering shaft and locks the steering shaft. At this time, since the key is not pushed by the key, the key sensing end 11a of the lock link 11 is immersed in the cylinder inner 1, and the locking end 11b is not in contact with the small diameter portion 22b of the cam outer 22.

When a key is inserted in this state, the key sensing end 11a is pushed up, and as shown in FIG.
Is in contact with the outer peripheral portion of the small-diameter portion 22b, and when the key is turned in the ON position direction, that is, clockwise, the cam outer 22 also turns clockwise together with the cam inner 21 directly connected to the cylinder inner 1, (c) ACC as shown
At this position, the locking end 11b is inserted into the cutout portion 22d of the small diameter portion 22b. Also, since the cam outer 22 rotates, the pin 2
5 slides in the groove 26 and moves in a direction close to the axis along the groove 26. As a result, the lock shaft 7 is drawn into the body 9 and the steering lock is released.

The inner end 26a of the groove 26 is formed in an arc shape from the ACC position to a range corresponding to the starter position, and the pin 25 does not move even if the key is turned to the ON position or the starter position. Therefore, in this range, the steering is kept unlocked, and the vehicle can be operated without any trouble.

FIG. 4D shows a state in which the key is turned to the lock position after the operation is completed. Since the key is still inserted, the locking end 11b is inserted into the cutout portion 22d of the small diameter portion 22b. For this reason, the locking end 11b is locked to the end face of the notch 22d, and the rotation of the cam outer 22 in the lock position direction is prevented at this position, and the cam outer 22 is urged in the lock position direction by the torsion spring 23. It is in a state. Accordingly, the pin 25 is located at the inner end 26a of the groove 26, and the lock shaft 7 remains retracted into the body 9, and the steering is not locked unless the key is removed.

Next, when the key is removed in this state, the locking end 1
1b comes off the notch 22d, and the cam outer 22 can rotate in the counterclockwise direction, and is rotated to the position shown in FIG. As a result, the pin 25 moves to the outer peripheral end 26b of the groove 26, the lock shaft 7 is pushed upward, and the steering shaft is locked again.

As described above, this embodiment has a structure in which the lock shaft 7 is protruded and retracted from the body 9 by directly driving the lock shaft 7 with the cam outer 22 by engaging the pin 25 with the groove 26. Therefore, a key must be used to release the lock, and the lock of the steering shaft cannot be released unless the cam outer 22 is rotated by operating the cylinder lock 3 with the key. That is,
The conventional lock spring is not used,
Even if the lid or a portion corresponding to the lid of the body is destroyed, the lock cannot be released because the internal structure is different, and the anti-theft function is sufficiently exhibited.

In the embodiment, the outer peripheral end 26 of the groove 26 is formed.
b is formed in a direction parallel to the circumference, and the pin 25 is located at the outer peripheral end 26b in the locked state. For this reason, even if a force in the release direction is directly applied to the lock shaft 7 in any way in the locked state, the cam outer 22
No rotation force is generated, and the lock shaft 7 does not move, which also ensures theft prevention.

[0023]

As is apparent from the above description, the present invention drives the lock shaft in the direction protruding toward the steering shaft side when turning in the lock position direction due to the key operation, and simultaneously moves the lock shaft in the ON position direction. A cam member for driving the lock shaft in a direction of immersion into the body side during rotation is provided, and a biasing spring for biasing the cam member in the lock position direction and rotating to the lock position when the key is removed is provided. is there.

That is, since the lock shaft is directly driven by the cam member via the engaging portion and the lock spring mounted in the body using the lid is not used, a portion corresponding to the conventional lid is broken. Even if the locked state cannot be released, and the shape and structure of the internal members are slightly changed, the anti-theft function can be improved without significantly increasing the cost as compared with the conventional one. .

Further, when the engagement portion between the lock shaft and the cam member is constituted by a combination of a pin provided on the lock shaft and a groove provided on an end face of the cam member, the rotation of the cam member is controlled by the rotation of the lock shaft. The lock shaft can be driven by reliably converting to linear movement.

Further, when the outer peripheral end of the groove of the engaging portion is formed in a direction parallel to the circumference, the lock shaft does not move even if a force in the releasing direction is directly applied to the lock shaft in the locked state. This also improves the anti-theft effect.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is an operation explanatory diagram of the embodiment.

FIG. 4 is a schematic sectional view of a conventional example.

FIG. 5 is a schematic sectional view of the conventional example viewed from another angle.

[Explanation of symbols]

 Reference Signs List 1 cylinder inner 2 cylinder outer 4 cam member 7 lock shaft 21 cam inner 22 cam outer 23 torsion spring 24 engagement portion 25 pin 26 groove 26b outer peripheral end

Claims (3)

(57) [Claims] 1. A steering lock device configured to lock a steering shaft by projecting a lock shaft toward a steering shaft in response to removal of a key at a lock position, wherein the engagement portion forms a cam mechanism. The lock shaft is engaged with the lock shaft via a key. When the lock shaft is turned to the lock position in response to a key operation, the lock shaft is driven in a direction protruding toward the steering shaft, and is turned from the lock position to the ON position. A cam member that is sometimes driven in a direction of immersion into the body side,
A biasing spring for biasing the cam member toward the lock position, and a lock link for locking the cam member when the key is inserted to prevent the cam member from rotating to the lock position, and lock the key. When the lock link is unlocked from the cam member by rotating to the position, the lock member is released to the lock position by the urging force of the urging spring so that the lock shaft projects toward the steering shaft. A steering lock device comprising: 2. A cam mechanism in which an engagement portion between a lock shaft and a cam member is formed by a combination of a pin provided on the lock shaft and a groove provided on an end face of the cam member. The steering lock device according to claim 1, wherein the groove is formed in a shape for moving the pin in an outer circumferential direction when the pin is turned. 3. The steering lock device according to claim 2, wherein an outer peripheral end of the groove of the cam member is formed in a direction parallel to the circumference.