Electric power steering device

Details Electric power steering device Electric power steering device

2004-04-16

2009-08-18

Morris, Lesley D (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C180S444000

Reexamination Certificate

active

07575090

ABSTRACT:
An electric power steering device provided with two belleville springs for suppressing the axial movement of a worm rotated by a steering-assisting electric motor and having shaft portions at its both end portions, and limiting members for limiting the deflection amounts of the two belleville springs. The limiting members are respectively disposed at portions along the outer circumferences of the shaft portions at both end portions of the worm, the respective inner circumferential portions of the two belleville springs are formed into flat portions, the outer circumferential portions thereof are respectively formed into tapered portions having a taper shape, and the limiting members are made contact with the flat portions, thereby limiting the deflection amounts of the tapered portions. Hence, the limiting members can be provided without increasing the size of the worm serving as a small gear.

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International Search Report for PCT/JP2004/005522 mailed on Aug. 17, 2004.
esp@cenet document view: Abstract for WO0125073 published on Apr. 12, 2001.
esp@cenet document view: Abstract for EP1222104 published on Jul. 17, 2002.

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