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Roller screw mechanism

A roller screw, roller screw technology, applied in mechanical equipment, belts/chains/gears, transmissions, etc., can solve the problem of limiting the load capacity of the roller screw mechanism

Inactive Publication Date: 2014-10-22
AB SKF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This limits the load capacity of the roller screw mechanism for a given axial dimension of the nut

Method used

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  • Roller screw mechanism
  • Roller screw mechanism
  • Roller screw mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] exist figure 1 Among them, the planetary roller screw mechanism 10 includes: a lead screw 2 with an axis 12 and an external thread 14; a nut 16 coaxially installed around the lead screw 12 and having an internal thread 18, and the inner diameter of the internal thread 18 is larger than the external thread 14; and, a plurality of longitudinal rollers 20 disposed radially between the screw 12 and the nut 16. The lead screw 12 extends longitudinally through a cylindrical bore of a nut 16 having internal threads 18 formed therein.

[0025] The rollers 20 are identical to each other and are regularly distributed around the screw 12 . Each roller 20 extends along an axis 20a coaxial with the screw axis 12a and comprises an external thread 22 which engages the thread 14 of the screw and the thread 18 of the nut.

[0026] Such as figure 2 As more clearly shown, each roller 20 also includes external gear teeth 24, 26 at each axial end, which are radially aligned by means of ...

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PUM

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Abstract

The roller screw mechanism comprises a screw 12 provided with an outer thread 14, a nut 16 surrounding and coaxial with said screw, said nut being provided with an inner thread 18, a plurality of rollers 20 radially disposed between the screw and the nut and each provided with an outer thread 22 and with two outer gear teeth 24, 26, two gear wheels 36, 38 each provided with gear teeth 40, 42 meshing with said gear teeth of the rollers, and two spacer rings 44, 46 for maintaining the rollers circumferentially spaced apart. The spacer rings 44, 46 are axially offset towards the inside relative to the gear teeth 40, 42 of the gear wheels.

Description

technical field [0001] The invention relates to the field of roller screw mechanisms for converting rotary motion into linear translational motion and vice versa. Background technique [0002] Such a mechanism is provided with: a lead screw having an external thread; a nut disposed about the lead screw and having an internal thread; and a plurality of longitudinal rollers having external threads engaging the external thread of the lead screw and the internal thread of the nut. The external thread of each roller extends axially at each end by means of a gear tooth which itself extends axially by means of a cylindrical stud or an outwardly extending pivot. [0003] In the first type of roller screw mechanism, the thread of the roller and the thread of the nut have the same helix angle as each other, and this thread angle is different from the helix angle of the thread of the screw, so that when the screw is relative to the nut As it rotates, the rollers spin on themselves and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22
CPCF16H25/2252F16H25/24
Inventor F·阿贝维E·阿勒格里
Owner AB SKF