Steering lock unit

Abstract

The present invention provides a steering lock unit which is possible to place priority on the operating speed or the extracting force of the lock member according to the engagement state of the lock member to the movable member. In a steering lock unit 10 comprising a transmission mechanism which transmits a power of the electric motor 22 to the lock shaft 30 which holds and releases engagement with a steering shaft, the transmission mechanism comprises: a shaft portion 24 a which is adapted to rotate in response to the operation of the electric motor 22 ; and a winder 26 which engages with the shaft portion 24 a and transmits the operation of the electric motor 22 to the lock shaft 30 . When releasing the engagement of the lock shaft 30 with the steering shaft, the shaft portion 24 a and the winder 26 integrally rotate in a normal state, while the winder 26 moves in an axial direction with respect to the shaft portion 24 a in case that a pull-out force of the lock shaft 30 greater than a predetermined quantity is necessary.

Description

technical field [0001] The present invention relates to a steering lock device for locking a steering wheel of an automobile or the like. Background technique [0002] Conventionally, a steering lock device has been used to prevent a vehicle such as an automobile from being stolen by locking the steering wheel. Generally, a steering lock device is in a locked state by entering a lock shaft into a recess formed on an outer peripheral portion of a steering shaft connected to a steering wheel, and on the other hand, is in an unlocked state by disengaging the lock shaft from the recess. [0003] In the conventional electric steering lock device, since there is only one driving method of the lock shaft, it is difficult to balance the operation speed and pulling force of the lock shaft. For example, the steering lock device disclosed in Patent Document 1 described below adopts a method in which the lock shaft moves forward and backward relative to the steering shaft by moving the...

AI Technical Summary

Problems solved by technology

[0007] However, in the steering lock device of Patent Document 1, regardless of the state of engagement between the lock shaft and the steering shaft, the lock shaft always moves at a predetermined position, and the operating speed and pull of the lock shaft cannot be optimally adjusted according to the state of engagement. an action in pulling

[0008] In the steering lock device of said patent document 2, the correct position detection of the lock shaft in the middle area is performed by using a resistance change detector, but it is necessary to use a resistance change detector, and correspondingly on the outer peripheral surface of the lock shaft Set special codes for continuous or step-by-step changes in resistance values, so there are problems with complex structures and high costs

[0009] In addition, in the steering lock device of Patent Document 2, the lock state detection switch is operated by a protrusion protruding laterally from the side surface of the front end side of the lock shaft, and by protruding toward the rear side in the longitudinal direction (that is, the direction in which the lock shaft moves), The protrusion on the rear end surface of the lock shaft activates the unlocked state detection switch, so it must be at least the distance obtained from the position of the locked state detection switch to the length of the front end of the protrusion at the rear end of the lock shaft plus the stroke of the lock shaft. Setting the two detection switches in the same way will hinder the design of the steering lock device when it is miniaturized

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