초록 ▼

This power steering gear has steering travel limiter for controlling the input rotation so that the hydraulic valve of the gear cannot be moved to a closed position previously established by contact of the wheel stop or internal stop in the gear. The limiter in the preferred embodiment employs a ser

This power steering gear has steering travel limiter for controlling the input rotation so that the hydraulic valve of the gear cannot be moved to a closed position previously established by contact of the wheel stop or internal stop in the gear. The limiter in the preferred embodiment employs a series of rings which are engaged in series in response to handwheel input and which prevent rotation of the input beyond a certain point at or inboard of internal stops or the wheel stops so that the valving of the gear cannot close to a point requiring the power steering pump to operate in relief.

대표청구항 ▼

A power steering system for a vehicle having dirigible wheels comprising a manually rotatable steering shaft, a power steering gear, a housing for said power steering gear, rotatable input means extending into said housing and movable in clockwise or counterclockwise directions for right and left tu

A power steering system for a vehicle having dirigible wheels comprising a manually rotatable steering shaft, a power steering gear, a housing for said power steering gear, rotatable input means extending into said housing and movable in clockwise or counterclockwise directions for right and left turn steering, output means extending from said housing, linkage means drivingly connecting said output means to the dirigible wheels of the vehicle, a power steering pump having pressure relief valve means therein for supplying pressure fluid for said system, hydraulically operated piston means mounted in said housing and operatively connected to said output means for the hydraulic drive of said output means, hydraulic control valve means disposed within said housing hydraulically connected to said pump and said piston means, said valve means comprising valve spool means operatively connected to said input means and a valve body operatively connected to said connector means, said valve spool means being rotatably positioned relative to said valve body in response to manual rotation of said input means to partially close said valve means and condition said piston means for power assist drive of said output, and travel limiter means operatively connected to said input means of said power steering gear external of said housing to establish right and left turn stop positions of said input shaft to prevent said valve body and valve spool from being moved to a closed position and said pump from operating in pressure relief, said travel limiter means comprising: a drive tube drivingly interconnecting said steering shaft and said input means of said power steering gear, a plurality of concentric and sequentially engageable stop ring means mounted on and driven by said drive tube, and fixed stop means for engaging the outer most of said stop ring means for limiting clockwise and counterclockwise rotation of said drive tube and thereby corresponding rotation of said steering shaft and input means of said power steering gear.