JP2019055645A - Steering lock structure - Google Patents

Abstract

To enable a column tube to be securely held by a steering lock body and eliminate decentering of an axis of a column shaft caused when the column tube is held by the steering lock body.SOLUTION: A column tube holding part 32 having two curve surfaces 32a, 32b having a curvature Rb larger than a curvature Ra of an outer peripheral surface of a column tube 1 is formed at a steering lock body 3. The outer peripheral surface of the column tube 1 is sandwiched between a bracket 4 forming an arc shape having a curvature larger than a curvature Ra of the outer peripheral surface of the column tube 1 and the steering lock body 3. At that time, contact portions between the outer peripheral surface of the column tube 1 and the two curve surfaces 32a, 32b of the column tube holding part 32 do not make line contact but make surface contact to increase holding power.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steering lock structure in which a steering angle sensor is integrated.

  Conventionally, in a vehicle such as an automobile, as described in Patent Document 1, in order to prevent theft of the vehicle, the column tube is held by a steering lock and locked to prevent the steering from rotating when the ignition switch is turned off. Is done. Further, a steering angle sensor for detecting the steering operation angle as described in Patent Document 2 is integrally incorporated in this type of steering lock.

JP 2012-96586 A (see paragraphs 0024 to 0030, FIG. 2) Japanese Patent Laying-Open No. 2015-108592 (see paragraphs 0018 to 0021, FIGS. 3 and 4)

  By the way, when a steering angle sensor is integrally incorporated in the above-described steering lock, as shown in FIGS. 4 and 5, the curvature of the outer peripheral surface of the column tube 50 is attached to the steering lock body 51 that holds the column tube 50 having a circular cross section. Forming a tube receiving surface 52 having a curved surface having a larger curvature, preparing a bracket 53 coupled to the steering lock body 51, and a curved surface having a curvature larger than the curvature of the outer peripheral surface of the column tube 50 of the bracket 53; In a state where the column tube 50 is sandwiched between the tube receiving surface 52 of the steering lock main body 51, both ends of the bracket 53 are fixed to the steering lock main body 51 with bolts 54.

  At this time, in order to suppress as much as possible the eccentricity with respect to the axis of the column tube 50 when the column tube 50 is held by the steering lock body 51, two protrusions having a substantially semicircular cross section parallel to the axial direction on the tube receiving surface 52 are provided. It is considered that the column tube 50 is held on the steering lock main body 51 by forming the stripe 55 and holding the two protrusions 55 and a part of the curved surface of the bracket 53 by so-called three-point holding. By holding three points in this way, the column tube has two points: one tube receiving surface having a curved surface larger than the curvature of the outer surface of the column tube 50 and the curved surface of the bracket larger than the curvature of the outer surface of the column tube 50. Eccentricity as in the case of holding 50 can be suppressed.

  However, in this case, the contact portion between the two protrusions 55 formed on the tube receiving surface 52 and the outer peripheral surface of the column tube 50 is a line parallel to the straight line in the axial direction of the column tube 50. 50 is held in a line contact state, and there is a problem that the contact area between the tube receiving surface 52 and the outer peripheral surface of the column tube 50 is small, and a sufficient holding force cannot be obtained.

  An object of the present invention is to make it possible to firmly hold a column tube by a steering lock body and to eliminate eccentricity with respect to a column shaft when the column tube is held by a steering lock body.

  In order to achieve the above object, a steering lock structure of the present invention includes a main gear that rotates in response to the rotation of a column shaft, and a rudder that includes a sub gear for detecting a rotation angle in conjunction with the rotation of the main gear. A steering lock structure in which an angle sensor is integrally incorporated, the steering lock main body holding a column tube having a circular cross section, and the column in a symmetrical position with respect to the axial center of the column shaft arranged in the column tube Two virtual axes set parallel to the axis of the shaft, and two curved surfaces formed on the steering lock main body and having a curvature larger than the curvature of the outer peripheral surface of the column tube centered on each of the virtual axes. A column tube holding portion having the column tube disposed opposite to the column tube holding portion; It is characterized in that it comprises a bracket to hold the outer circumferential surface between the steering lock body.

  According to the present invention, the column tube holding portion having two curved surfaces having a curvature larger than the curvature of the outer peripheral surface of the column tube is formed on the steering lock body, and the bracket and the steering lock body disposed opposite to the column tube holding portion, Between which the outer peripheral surface of the column tube is sandwiched. At this time, the contact portion between the outer peripheral surface of the column tube and each of the two curved surfaces of the column tube holding portion is not a line contact but a surface contact.

  Therefore, when the outer peripheral surface of the column tube is sandwiched between the two curved surfaces of the column tube holding portion of the steering lock body and the bracket, the outer peripheral surface of the column tube is brought into surface contact with the two curved surfaces of the column tube holding portion. Since it can be held, the holding force when holding the outer peripheral surface of the column tube by holding it with the column tube holding part and the bracket can be increased as compared with the case of holding in a line contact state as in the past, It becomes possible to hold the column tube firmly.

  Furthermore, since the column tube is held at three points by the two curved surfaces of the column tube holding portion and the bracket, the eccentricity when holding the column tube can be suppressed as much as possible.

It is a side view of one embodiment of the steering lock structure of the present invention. It is the front view which cut | disconnected a part of FIG. It is explanatory drawing of the column tube holding | maintenance part in FIG. It is the front view which cut | disconnected a part of conventional steering lock structure. It is a one part perspective view of FIG.

  An embodiment of a steering lock structure according to the present invention will be described in detail with reference to FIGS.

  The steering lock structure in which the rudder angle sensor in this embodiment is integrated is configured as shown in FIG. That is, a column tube 1 having a circular cross section is connected to a steering shaft of a vehicle (not shown), and a steering angle sensor 2 is attached to the column tube 1 with the column tube 1 fitted therein. The extended column tube 1 is sandwiched and held by the steering lock body 3 and the bracket 4. In FIG. 1, reference numeral 5 denotes a bolt for fixing the flange portions at both ends of the bracket to the steering lock body 3.

  The rudder angle sensor 2 includes a ring-shaped main gear that rotates in response to the rotation of the column tube disposed in the column tube 1 and two sub gears for detecting the rotation angle in conjunction with the rotation of the main gear. And a detection circuit for deriving the rotation angle of the steering by performing a signal processing length, and when the rotation of the column tube 1 (column shaft) is transmitted to the main gear, the first sub gear meshed with the main gear, A second sub gear meshed with one sub gear rotates, and a magnetic sensor and a detection circuit for deriving the rotation angle of the column tube 1, that is, the steering based on the rotation of the first and second sub gears are mounted on the printed circuit board. A printed circuit board and both sub-gears are built in the steering lock body 3.

  Here, the steering lock body 3 incorporates a lock mechanism including a motor for restricting the rotation of the column tube and locking the steering when the ignition switch is turned off, and a regulating body driven by the motor.

  As shown in FIGS. 2 and 3, the column tube having two curved surfaces 32 a and 32 b having a curvature Rb (> Ra) larger than the curvature Ra of the outer peripheral surface of the column tube 1 at the upper part of the steering lock body 3. A column is formed between the column tube holding unit 32 and the bracket 4 formed with a holding unit 32 and having an arc shape with a larger curvature than the curvature Ra of the outer peripheral surface of the column tube 1 and the column tube holding unit 32. The outer peripheral surface of the tube 1 is clamped, and the flanges at both ends of the bracket 4 are fastened and fixed by the bolts 5 in a state where the flanges are in contact with both sides of the column tube holding part 32 of the steering lock body 3. The column tube 1 is held by the main body 3.

  At this time, as shown in FIG. 3, two virtual axes P2, parallel to the axis of the column shaft, are arranged in a symmetrical position with respect to the axis center P1 of the column shaft (not shown) arranged in the column tube 1. P3 is set, and two curved surfaces 32a and 32b having a curvature Rb larger than the curvature Ra of the outer peripheral surface of the column tube 1 are formed around these virtual axes P2 and P3, respectively.

  In this way, the column tube holding portion 32 having the two curved surfaces 32a and 32b having the curvature Rb larger than the curvature Ra of the outer peripheral surface of the column tube 1 is formed in the steering lock body 3, and the curvature Ra of the outer peripheral surface of the column tube 1 is formed. By sandwiching the outer peripheral surface of the column tube 1 between the bracket 4 having an arc shape with a larger curvature and the steering lock main body 3, the outer peripheral surface of the column tube 1 and the two curved surfaces 32a of the column tube holding portion 32, The contact portion with each 32b is not a line contact but a surface contact.

  Therefore, according to the above-described embodiment, when the outer peripheral surface of the column tube 1 is sandwiched between the two curved surfaces 32 a and 32 b of the column tube holding part 32 of the steering lock body 3 and the bracket 4, the column tube holding part Since the outer peripheral surface of the column tube 1 can be held in a surface contact state by the two curved surfaces 32 a and 32 b, the outer peripheral surface of the column tube 1 is sandwiched and held by the column tube holding part 32 and the bracket 4. The holding force can be increased and the column tube 1 can be firmly held as compared with the case where the holding force is held in a line contact state as in the prior art.

  Further, two curved surfaces 32a and 32b of the column tube holding portion 32 having a curvature Rb larger than the curvature Ra of the outer peripheral surface of the column tube 1 and an arc shape having a curvature larger than the curvature Ra of the outer peripheral surface of the column tube 1 are formed. Since the column tube 1 is held at three points by the bracket 4, eccentricity when holding the column tube 1 can be suppressed as much as possible.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention. For example, the shape of the steering lock body 3 is not limited to the shape shown in FIG.

  In the above-described embodiment, the specific values of the curvature Ra of the outer peripheral surface of the column tube 1 and the curvature Rb of the two curved surfaces 32a and 32b of the column tube holding portion 32 are not particularly defined, but the curved surfaces 32a and 32b. It is desirable that the curvature Rb is set to an optimum value for obtaining a contact area corresponding to the holding force when holding the column tube 1.

  The present invention can be applied to various vehicles including a steering lock in which a steering angle sensor is integrated.

DESCRIPTION OF SYMBOLS 1 ... Column tube 2 ... Steering angle sensor 3 ... Steering lock main body 4 ... Bracket 32 ... Column tube holding part 32a, 32b ... Curved surface Ra, Rb ... Curvature

Claims (1)

A steering lock structure in which a steering gear sensor including a main gear that rotates in response to the rotation of the column shaft and a sub gear for detecting a rotation angle in conjunction with the rotation of the main gear is integrated,
A steering lock body holding a column tube having a circular cross section;
Two imaginary axes set in parallel to the column shaft axis at symmetrical positions with respect to the axis of the column shaft disposed in the column tube;
A column tube holding portion formed on the steering lock body and having two curved surfaces with a curvature larger than the curvature of the outer peripheral surface of the column tube, with each of the virtual axes as a center;
A steering lock structure comprising: a bracket that is disposed to face the column tube holding portion and clamps an outer peripheral surface of the column tube with the steering lock body.

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