The application incorporates by references the subject matter of Application No. 2003-137616 filed in Japan on May 15, 2003, on which a priority claim is based on 35 U.S.C. ยง 119(a).
(1) Field of the Invention
The present invention relates to a steering column with a vehicle steering shaft disposed therein, and more particularly to a supporting apparatus for a tilt type steering column which is capable of absorbing impact applied in the event of head-on vehicle crash.
(2) Description of the Related Art
Conventionally, as a supporting structure for a tilt type steering column of a vehicle, supporting structures disclosed in Japanese Laid-Open Patent Publication No. 11-115770 and Japanese Utility Model Publication No. 62-23771 have been known.
The supporting structure disclosed in Japanese Laid-Open Patent Publication No. 11-115770 has the problem that once a steering column has been released from a vehicle body forward in the direction of the length of a vehicle, energy cannot be absorbed by the steering column.
Also, the supporting structure disclosed in Japanese Utility Model Publication No. 62-23771 has the problem that the position of a steering column held by support pins for tilting the steering column, i.e. the position of a steering wheel at the rear end of the steering column is unstable because the support pins shift while crushing edges of slotted holes and hence relatively small impact energy can be only absorbed. Therefore, for example, in the case where an air bag is mounted on the steering wheel, there is a possibility that the form of the airbag being inflated toward the driver is unstable.
The present invention provides a steering column supporting apparatus which includes a tilt bracket located fixed to a vehicle body; a support pin locked on one of the tilt bracket and the steering column, and passed through a hole formed in the other one of the tilt bracket and the steering column, such that the steering column tilts about the support pin; a slotted hole formed integrally with the other one of the tilt bracket and the steering column, and extended continuously from the hole toward a steering wheel in a direction substantially identical with an axial direction of the steering column; and a bulging part formed integrally with the steering column at a location closer to the steering wheel than the tilt bracket, and designed to be larger than a gap between the steering column and the tilt bracket.
The nature of this invention, as well as other objects and advantages thereof, will be explained in the following with reference to the accompanying drawings, in which like reference character designate the same or similar parts throughout figure and wherein:
The present invention will now be described in detail with reference to the accompanying drawings showing a preferred embodiment thereof.
As shown in
Further, as shown in
Further, a bulging part 20 formed of a relatively thick steel plate is welded to a lower surface of the steering column 2 in the tilt rear mechanism 16 and at a location closer to the steering wheel located in the rear in the direction of the length of the vehicle than the tilt bracket 14. The budging part 20 is substantially V-shaped in longitudinal cross-section as indicated by a dashed line in
Therefore, in the event of head-on vehicle crash, the column bracket 3 is released forward in the direction of the length of the vehicle (leftward as viewed in
On this occasion, the tilt pins 15 are relatively guided along the slotted holes 12 of the tilt plates 10 and rearward in the direction of the length of the vehicle, so that the steering column 2 is supported without being displaced. Therefore, the position of the steering wheel at the rear end of the steering column can be stable, and the inflation form of the airbag mounted on the steering wheel can be substantially constant, so that the air bag can absorb impact in a satisfactory manner.
Further, when the steering column 2 is displaced forward in the direction of the length of the vehicle, the tilt bracket 14 and the bulging part 20 of the steering column 2 come to abutment with each other. Since the tilt bracket 14 usually has a high stiffness, the bracket 14 continuously crushes the bulging part 20 from front to back in the length of the direction of the vehicle as shown in
It is to be understood that the present invention is not limited to the above described embodiment. For example, the same effects can be obtained as in the above described embodiment even if the holes 11 and the tilt pins 15 are provided in the tilt bracket 14 and the steering column 2, respectively, contrary to the above described embodiment.
Number | Date | Country | Kind |
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P2003-137616 | May 2003 | JP | national |