JPS6164560A - Key lock device for steering shaft - Google Patents

Abstract

PURPOSE:To enhance further the possibility of antitheft, by allowing rotation of a steering shaft, but causing click action to the rotation, and letting the shaft substantially unsteerable when an excessive torque is applied to the steering shaft. CONSTITUTION:A lock pin engage groove 3A is formed on a key lock collar 2. Also, a rotatioin moderating mechanism 5 is provided between the key lock collar 2 and a steering shaft 1. The rotation moderating mechanism 5 is constructed so that a key 6 is received in plural key receiving grooves 8 which are formed on a steering shaft 1, and the key 6 is enforced outward by springs to engage with a key engage groove 9 which is formed in the key lock collar 2. Therefore, when excessive torque is applied to the shaft 1 when it is locked, the key 6 is enforced to the grove 8 side and the shaft 1 can rotate, but since the key 6 engages with the next engage groove, large torque becomes necessary to rotate the shaft 1, thus the shaft becomes substantially unsteerable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a key lock device for a steering shaft of an automobile.

Conventional technology The steering shaft for automobiles is well known.

When the key plate inserted into the key plate insertion hole of the ignition key switch is rotated to the lock position and pulled out, it is locked and rotation is restricted. As shown in Figure 3.4, this is a key lock collar 2 with a lock bin retaining hole 3 formed in the steering shaft 1.
The lock pin 4 is advanced toward the center of the steering shaft 1 by fitting it onto the outside and fixing it with a pin or by welding, and locking the key plate (not shown in Figure 1). 3, the movement of the collar 2 in the rotational direction, that is, the rotation of the steering shaft 1, is restrained, thereby providing an anti-theft effect. This similar structure is %For example, in February 1980, Nissan Motor Co., Ltd.
Published "Volkswagen Santana Maintenance Manual G-8
Shown on page.

Problems to be Solved by the Invention Since the key lock collar 2 is bolted or welded to the steering wheel 7), the steering shaft 1
In the locked state, an excessive input is applied to the steering shaft 1 in the direction of rotation.

When the lock bin 4 is damaged or the joint between the key lock collar 2 and the steering shaft 1 is broken, the steering shaft 1 rotates, causing some problems in theft prevention.

Therefore, in the present invention, when the steering shaft is in a locked state and an excessive input is applied to the steering shaft in the rotational direction, the steering shaft is allowed to rotate above a certain rotational torque, but the rotation To provide a key lock device for a steering shaft, which substantially prevents steering operation due to a clicking action and can further improve theft prevention performance.

Means for Solving All Problems A key lock collar with a lock bin engaging groove formed around the circumferential fill is rotatably fitted onto the steering shaft, and a key lock collar and a steering wheel are connected between the key lock collar and the steering shaft. Connect with the shaft 1. A rotation moderation mechanism is provided that allows rotation of the steering shaft when a rotational torque of a predetermined value or more is applied to the steering shaft while the key lock collar is in the keylocked state, and that applies a click action to the rotation of the shaft.

Operation When the key lock collar is in the locked state, that is, the steering shaft is in the locked state, when a rotational torque of more than a predetermined value is applied to the steering shaft, the rotation moderation +jA mechanism allows the steering shaft to rotate, but this rotation is not affected by a click action. Accompanied.

Unless a rotational torque of a predetermined value or more is continuously applied, smooth rotation of the steering shaft is prevented and steering operation is made substantially impossible.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

In Fig. 1.2, a lock bin engaging groove 3A is formed on the circumferential side of the key lock collar 2, into which the lock bin 4 engages and disengages.
It is rotatably fitted onto the outside. A rotation moderation mechanism 5 is disposed between the key lock collar 2 and the steering shaft 1. The rotary moderation mechanism 5 includes a plurality of keys 6 which are disposed in a plurality of key accommodating grooves 8 formed on the circumferential surface of a steering shaft 1, and which are biased outwardly by a spring 7, and a key lock. It is comprised of a plurality of key retaining grooves 9 formed on the inner circumferential surface of the collar 2 and into which the key 6 engages and disengages. The tip of the key 6 is rounded to prevent it from getting caught when engaging and disengaging from the key engagement groove 9. Further, the rotation moderation mechanism 5 applies a rotational torque of a predetermined value or more to the steering shaft 1, for example, 20 kp-, when the key lock collar 2 is in the locked state, that is, the steering shaft 1 is in the locked state.
When a rotational torque of m or more is applied, the key 6 is activated by the spring 7.
The key 6 moves toward the accommodation groove 8 side against the force, disengages from the engagement groove 9, and allows the steering shaft 1 to rotate. The springs 7 are set to maintain the state of connection between the collar 2 and the collar 2.

According to the above implementation structure, the lock pin 4 is biased toward the center of the steering shaft 1 by the key plate operation (not shown), and the lock pin engagement groove 3A of the key lock collar 2 is
When K is depressed and the collar 2 is exposed, and therefore the rotation of the steering shaft 1 is locked, there is an excessive input to the steering shaft 1 in the rotational direction, for example 20 kg. When a rotational torque of tn or more is applied, the key 6 of the one-turn moderation mechanism 5 is activated by the spring 7.
It moves toward the housing groove 8 side against the force and leaves the key retaining groove 9 to allow rotation of the steering wheel 7)1. However, once the key 6 falls into the adjacent key engaging groove 9, the coupling state between the steering shaft 1 and the collar 2 will not be released unless a rotational torque of more than the predetermined value (20 kg-m) is applied again. Therefore.

Although rotation of the steering shaft 1 is allowed.

Theft prevention can be ensured by making steering operations virtually impossible.

Effects of the Invention As described above, according to the present invention, when an excessive input is applied to the steering shaft in the direction of rotation when the key is locked, the rotation moderation mechanism allows the steering shaft to rotate. There will be no breakage of the pin or damage to the joint between the key lock collar and the steering shaft.
Rotation of the steering shaft requires a rotational torque exceeding a predetermined value, and the rotation of the shaft produces a click action, making steering operations virtually impossible.

Therefore, it has a great practical effect of further improving theft prevention properties.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing the main parts of an embodiment of the present invention, and FIG.
The drawings are a sectional view taken along the line ntt in FIG. 1, FIG. 3 is a half sectional view showing a conventional structure, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 1... Steering shaft, 2... Key lock collar b3A... Lock pin retaining groove, 4... Long pin/. 5...Rotary moderation mechanism. Figure 11

Claims (1)

[Claims] (1) A key lock collar with a lock pin engagement groove formed on the circumferential side is rotatably fitted onto the steering shaft, and the key lock collar and the steering shaft are connected between the key lock collar and the steering shaft. However, when a rotational torque of a predetermined value or more is applied to the steering shaft while the key lock collar is locked, the steering shaft is allowed to rotate, and a rotation moderation mechanism is provided that applies a click action to the rotation of the shaft. Features a key lock device for the steering shaft.