Load lock for ball nut and screw mechanism
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United States of America Patent
Stats
-
Mar 22, 1994
Grant Date -
N/A
app pub date -
Sep 23, 1992
filing date -
Sep 23, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A ball screw and nut mechanism includes an elongated cylindrical screw having an outer helically threaded surface which extends through a cylindrical opening formed through a nut having a complementary helically threaded surface. A plurality of balls are disposed between the screw and the nut, each extending partially into both of the complementary threads to provide a rolling engagement between the screw and the nut. A load lock is provided to prevent the nut from moving axially relative to the screw when the balls are not present in the threads. The load lock includes a wire member which is generally helical in shape, having a pitch which is approximately equal to the pitch defined by the cooperating threads. The wire member is threaded partially through the threads, but does not normally inhibit rotation of the screw relative to the nut. The wire member is formed having a tang portion on one end thereof. The tang portion is adapted to be received within one of a plurality of recesses formed in an end face of the nut when the wire member is threaded therein. The cooperation of the tang portion with the recess functions to retain the wire member in position within the nut.
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