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US 11,525,498 B2Granted
Screw device
AssigneeThk Co., Ltd.
InventorsKazuyoshi Mochizuki, Tetsuya Miura, Ryuji Muramatsu, Yusuke Todoroki
Life of this patent
Estimating the term…
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.
Claims8
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,
- wherein the sensor is sandwiched between a first holder and a second holder, the first holder being mounted on an inner surface of the nut and having a body portion that enters the groove of the nut, and the second holder being mounted on the inner surface of the nut and having a body portion that enters the groove of the shaft.
4 more elements
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,
- wherein the sensor is sandwiched between a first holder and a second holder, the first holder being mounted on an inner surface of the nut and having an extension portion that is in direct contact with a top of a ridge of the nut, and the second holder being mounted on the inner surface of the nut and having an extension portion that is in direct contact with a top of the ridge of the nut.
4 more elements
Dependencies are inferred from the claim text.