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US 2021/0277984 A1Published application
Screw device
AssigneeThk Co., Ltd.
InventorsKazuyoshi MOCHIZUKI, Tetsuya MIURA, Ryuji MURAMATSU, Yusuke TODOROKI
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Abstract
A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.
Claims12
A screw device comprising:
- a screw shaft including a groove;
- a nut including a groove facing the groove of the screw shaft;
- at least two circulation components mounted on the nut in such a manner as to form at least two circulation circuits;
- a plurality of rolling elements housed in the at least two circulation circuits;
- and
- a sensor provided to the nut, the sensor being configured to detect a displacement of the groove of the screw shaft between the adjacent circulation circuits.
3 more elements
Dependencies are inferred from the claim text.