Roller screw mechanism with integrated ring gears and associated manufacturing method
AssigneeAktiebolaget Skf
InventorsFolly ABEVI, Christian BOCH
Life of this patent
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Abstract
A roller screw mechanism comprising a screw having an outer thread, a nut disposed around and coaxially with the screw. The nut includes an inner thread. A plurality of rollers are disposed radially between the screw and the nut and are each provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth. The mechanism additionally comprises two synchronizing gear teeth that are formed on the nut and are each engaged with one of the gear teeth of the rollers. The root diameter of each gear teeth is less than the inside diameter of the inner thread of the nut.
Claims10
A roller screw mechanism comprising:
- a screw having:
- an outer thread,
- a nut disposed around and coaxially with the screw, the nut comprising an inner thread, and
- a plurality of rollers that are disposed radially between the screw and the nut and are each provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth;
- and
- two synchronizing gear teeth, wherein each of the two synchronizing gear teeth is each engaged with one of the gear teeth of the rollers,
- wherein the synchronizing gear teeth are formed on one of:
- (a) the nut, wherein a root diameter of each gear teeth is less than an inside diameter of the inner thread of the nut, or
- (b) the screw, wherein the root diameter of each gear teeth is greater than the outside diameter of the outer thread of the screw.
An actuating cylinder comprising a driving feature for driving in rotation and a roller screw mechanism, the roller screw mechanism comprising:
- a screw having:
- an outer thread,
- a nut disposed around and coaxially with the screw, the nut comprising an inner thread, and
- a plurality of rollers that are disposed radially between the screw and the nut and are each provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth;
- and
- two synchronizing gear teeth, wherein each of the two synchronizing gear teeth is each engaged with one of the gear teeth of the rollers,
- wherein the synchronizing gear teeth are formed on one of:
- (a) the nut, wherein a root diameter of each gear teeth is less than an inside diameter of the inner thread of the nut, or
- (b) the screw, wherein the root diameter of each gear teeth is greater than the outside diameter of the outer thread of the screw,
- the screw of the mechanism being coupled to the driving feature.
A method for manufacturing a nut or a screw of a roller screw mechanism comprising a thread and two gear teeth that are disposed axially on either side of the thread, the method comprising a step of:
- removing material by axial broaching in order to form the two gear teeth in a single axial pass such that each of the gear teeth is radially offset with respect to the thread.
Dependencies are inferred from the claim text.