Steering column system
AssigneeFuji Kiko Co., Ltd.
InventorMitsuyoshi Matsuno
Life of this patent
Estimating the term…
Abstract
Provided is a steering column system capable of firmly holding a jacket during a normal condition and securing a larger movement stroke for the jacket when an excessive impact force is applied. To this end, when a clamp bolt (72) is fastened, sliding contact portions (70a) are pressed to abutment parts (43), respectively. Thus, a jacket (3) is firmly clamped to and held by a mount bracket (6). When a force in excess of a predetermined value is applied to the jacket (3) in its axial direction, shear portions (74b) break, and thereby a restraint imposed on a movement range by restraint portions (74a) is lifted. This contracts the jacket (3).
Claims5
A steering column system, comprising:
- a mount bracket including a fixed portion and a suspended portion, the fixed portion fixed to a vehicle body, the suspended portion united with the fixed portion;
- a steering shaft having a steering wheel fixed to an axially uppermost end thereof;
- a jacket configured to rotatably support the steering shaft;
- a jacket bracket which is integrally formed on an outer peripheral surface of the jacket and which includes a sliding contact portion and a slit, the sliding contact portion extending in an axial direction of the jacket, the slit formed so as to extend in the axial direction of the jacket and to be opened toward a rear of the vehicle body;
- a jacket guide placed between the mount bracket and the jacket, the jacket guide including an abutment part which is opposed to and abuts on the sliding contact portion;
- a clamp bolt which is supported by the mount bracket and which includes a shaft portion, the shaft portion penetrating the slit of the jacket bracket and the jacket guide;
- and
- a detachment member including a restraint portion and a shear portion, the restraint portion being placed in such a way as to lie across the slit to restrain a movement range of the clamp bolt in the slit, the shear portion configured to fix the restraint portion to the jacket bracket and to be released from their connection when a force in excess of a predetermined value is applied, wherein
- when the clamp bolt is fastened, the sliding contact portion is pressed to the abutment part, and the jacket is firmly clamped to and held by the mount bracket;
- and
- when the force in excess of the predetermined value is applied to the jacket in its axial direction while the clamp bolt is being fastened, the shear portion breaks, and thereby the restraint imposed on the movement range by the restraint portion is lifted, and the jacket moves.
Dependencies are inferred from the claim text.