Roller screw
AssigneeAktiebolaget Skf
InventorsGerard Buvril, Philipp Krebs, Jean-Paul Giraudeau, Sebastien Lecluse
Life of this patent
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Abstract
The roller screw mechanism is provided with a screw comprising an external thread, with a nut arranged around and coaxial with the said screw, the nut comprising an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks interacting with the said threads. The value of the opening angle α of the flanks of the external thread of the screw is greater than the value of the opening angle of the flanks of the rollers.
Claims16
A roller screw mechanism providing a screw, the mechanism comprising:
- an external thread, with a nut arranged around and coaxial with the screw, the nut having an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks of the rollers interacting with the external and internal threads of the screw and the nut, and wherein
- the value of an opening angle (α, β) of flanks of at least one of the external and internal threads is greater than the value of the opening angle (μ) of the flanks of the rollers,
- wherein the value of the opening angle (α) of the flanks of the external thread of the screw is greater than the value of the opening angle (β) of the flanks of the internal thread of the nut.
An actuating cylinder comprising:
- a rotational drive means, and
- a roller screw mechanism, the roller screw mechanism having:
- an external thread, with a nut arranged around and coaxial with the screw, the nut having an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks of the rollers interacting with the external and internal threads of the screw and the nut, and wherein
- the value of an opening angle (α, β) of flanks of at least one of the external and internal threads is greater than the value of the opening angle (μ) of the flanks of the rollers, and wherein
- wherein the value of the opening angle (α) of the flanks of the external thread of the screw is greater than the value of the opening angle (β) of the flanks of the internal thread of the nut, and wherein
- the screw of the mechanism is coupled to the drive means.
A roller screw mechanism providing a screw, the mechanism comprising:
- an external thread, with a nut arranged around and coaxial with the screw, the nut having an internal thread, and with a plurality of rollers interposed between the screw and the nut and comprising flanks of the rollers interacting with the external and internal threads of the screw and the nut, and wherein
- the value of an opening angle (α, β) of flanks of at least one of the external and internal threads is greater than the value of the opening angle (μ) of the flanks of the rollers,
- wherein only the value of the opening angle (α) of the flanks of the external thread of the screw is greater than the value of the opening angle (μ) of the flanks of the rollers, and wherein
- the value of the opening angle (β) of the flanks of the internal thread of the nut being equal to the value of the opening angle (μ) of the flanks of the rollers.
Dependencies are inferred from the claim text.