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US 2002/0157490 A1Published application
Rectilinear motion driving apparatus
AssigneePubot Giken Co., Ltd.
InventorsYasuo Higuchi, Tatsurou Hirayama
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AssigneePubot Giken Co., Ltd.
InventorsYasuo Higuchi, Tatsurou Hirayama
Estimating the term…
In a rectilinear motion driving apparatus, a shaft (6) is fitted into a cylindrical body (4) in a coaxial state, and a plurality of cylindrical coil rollers (3a) is interposed between the cylindrical body and the shaft by press fit so as to roll at a predetermined inclined angle to the axial direction. Further, these cylindrical coil rollers (3a) are contacted with an outer peripheral surface of the shaft and an inner peripheral surface of the cylindrical body with a pressure contact force, and the cylindrical body or the shaft is rotated so that the shaft or the cylindrical body makes a rectilinear motion toward an axial direction. A pressure contact force of both inner and outer surfaces of the cylindrical coil roller (3a) to the cylindrical body (4) and the shaft (6) is set higher than an intermediate portion of the cylindrical body (4) in the vicinity of the end portion thereof, or is set lower than the intermediate portion of the cylindrical body (4) in the vicinity of the end portion thereof. By doing so, when the cylindrical coil roller (3a) approaches both ends of the cylindrical body, a pressure contact force increases or decreases; therefore, a slip is prevented from being accumulated. In other words, in the case where the stop position of the cylindrical coil roller (3a) is too biased to one end side, it slips to a reverse direction, and thereby, the axial stop position of the cylindrical coil roller (3a) can be kept within an allowable range.
A rectilinear motion driving apparatus, comprising:
A rectilinear motion driving apparatus, comprising:
A rectilinear motion driving apparatus, comprising:
Dependencies are inferred from the claim text.