Rack bar of power steering gearbox

Machine element or mechanism – Gearing – Follow-up mechanism

Reexamination Certificate

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Details

C074S422000, C180S441000, C091S399000, C091S401000

Reexamination Certificate

active

10330191

ABSTRACT:
Disclosed is an apparatus for protecting impact to a rack bar of a power steering gearbox comprising an oil pressure cylinder, to which oil which has passed through an oil pressure pump and a rotary valve is supplied through a left port or right port, a rack bar disposed in the oil pressure cylinder and horizontally reciprocating, a piston fixed at the middle of the rack bar, a first lack bush and a second lack bush disposed at both ends of the cylinder, in which the piston moves, to close the cylinder, and bypass holes with a downward convex shape disposed at both ends of the cylinder adjacent to the first and second rack bushes, in which a part of oil pressure is released immediately before a piston of the rack bar moving by the power of oil pressure reaches a rack bush, whereby impact to the cylinder or noise is not generated.

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English Language Abstract of DE 4221459.

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