Flexible ribbed, no-backlash ball nut

Details Flexible ribbed, no-backlash ball nut Flexible ribbed, no-backlash ball nut

1991-03-29

1992-03-10

Wright, Dirk

Machine element or mechanism

Gearing

Teeth

74 8915, F16H 5522

Patent

active

050941194

ABSTRACT:
A ball screw assembly (10) includes a ball nut (12) and a lead screw (14). The ball nut (12) has a construction which provides both a flexiblility comparable to that achieved with a coil spring ball nut design and a stiffness of a solid ball nut body. The ball nut (12) consists of three sections: a head (16), a tail (18) and a connecting section (20). The connecting section (20) contains most of a ball circuit (22) in the form of a helical track (24), along which ball bearings (14) travel as the ball nut (12) and the lead screw (14) rotate with respect to each other. A plurality of separate slots (32) are provided, essentially along the helical track (24) of the ball circuit (22). The slots (32) are interrupted by a solid spine (34) along the length of the connecting section (20). Segments (36) of the connecting section (20) between the slots ( 32) form ribs connected to the backbone or spine (34). The spine (34) provides stiffness for the ball nut (12) and the rib segments (36) flex to compensate for variations in threads (38) of the lead screw (14).

REFERENCES:
patent: 3831460 (1974-08-01), Linley, Jr.
patent: 4660431 (1987-04-01), Heine
patent: 4896552 (1990-01-01), Virga

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