Tilt steering system
AssigneeNsk Ltd.
InventorHiroyuki Kii
Life of this patent
Estimating the term…
Abstract
A construction is realized in which a large difference in operation force to operate an adjustment lever 24a never occurs irrespective of a vertical position of a steering wheel and which is produced at low costs. In part of a supporting plate portion 15a of a pair of left and right supporting plate portions 15a which make up a supporting bracket 14a, a thickness of a peripheral portion 34 which surrounds a vertically elongated hole 17a is made small at an upper portion and large at a lower portion. Additionally, a change in operation force of the adjustment lever 24a based on the difference in thickness and a change in the operation force based on a difference in rigidity of the supporting plate portion 15a are offset by each other to thereby solve the problem.
Claims6
A tilt steering system comprising:
- a steering column that is swingably movable about a tilt shaft provided in a widthwise direction;
- a displacement bracket fixed to an axial intermediate portion of the steering column;
- a steering shaft supported rotatably on a bore diameter side of the steering column, the steering shaft fixing a steering wheel to a rear end portion of the steering column;
- a first supporting plate portion being suspended downwards from a mounting plate portion provided on a vehicle body;
- a second supporting plate portion being suspended downwards from the mounting plate portion and provided so as to be spaced apart from the first supporting plate portion in the widthwise direction;
- a supporting bracket supported on the vehicle body by the mounting plate portion in such a state that the displacement bracket is held from both sides of the displacement bracket in the widthwise direction by the first and second supporting plate portions;
- a first vertically elongated hole that is long in a vertical direction and is provided in the first supporting plate portion;
- a second vertically elongated hole is provided in a portion of the second supporting plate portion, the portion being aligned with the first vertically elongated hole;
- through holes that penetrate through portions of the displacement bracket, the portions being aligned with the first and second vertically elongated holes, a tilt rod member which is inserted through the through holes;
- an anchor portion provided on the tilt rod member so as to face oppositely a first location on an outer surface of the first supporting plate portion;
- a presser member that faces oppositely a second location on an outer surface of the second supporting plate portion so as to expand and contract a space defined between the anchor portion and the presser member based on oscillation of a tilt lever, wherein
- the mounting plate portion is provided at an upper end portion of the supporting bracket;
- a thickness of an upper portion of at least one of the first location and the second location is smaller than a thickness of a lower portion;
- and
- a space defined between the first location and the second location is smaller at a portion near the mounting plate portion than the space at a portion far away from the mounting plate portion.
Dependencies are inferred from the claim text.