Mechatronic system with shock absorber
AssigneeSchaeffler Technologies AG & Co. KG
InventorJason HOOVER
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Abstract
A mechatronic device, such as a rod-style linear actuator, is disclosed having a shock absorber. In embodiments, the device includes a threaded screw that, when rotated, is also forced to move linearly. A drive nut assembly is disposed about the screw and includes a planetary roller assembly with planetary rollers with threading that engage the threaded screw. The shock absorber is disposed linearly adjacent to the planetary roller assembly and is configured to absorb and/or dissipate a static shock load transmitted through the device so as to protect the screw. The shock absorber may be a polymeric cylindrical member disposed about the screw and contacting the planetary roller assembly via springs.
Claims20
A planetary roller screw configured to convert rotary motion into linear motion or vice versa, the planetary roller screw comprising:
- an outer housing;
- a hollow push tube disposed within the outer housing and extending along a linear axis within the outer housing;
- a threaded spindle configured to move axially along the linear axis and rotate about the linear axis, the threaded spindle having external threading;
- and
- a drive nut assembly disposed radially between the threaded spindle and the push tube, the drive nut assembly including
- a plurality of planetary rollers arranged about the threaded spindle, each planetary roller having (i) internal threading engaged with the external threading of the threaded spindle, and (ii) external threading,
- an outer ring having (i) internal threading engaged with a portion of the external threading of the planetary rollers, and (ii) an outer surface engaged with an internal surface of the push tube, and
- a shock absorber mechanically coupled to the outer ring, disposed about the threaded spindle and configured to absorb a shock load provided to the threaded spindle.
A rod-style actuator comprising:
- a housing;
- a threaded rod configured to move linearly through the housing;
- and
- a drive nut assembly disposed radially between the threaded rod and the housing, the drive nut assembly having a threaded inner surface engaging the threaded rod and a non-threaded outer surface engaging the housing, the drive nut assembly further including a cylindrical polymeric shock absorber disposed about the threaded rod and configured to absorb a shock load provided to the threaded rod.
A mechatronic linear actuator comprising:
- a rod having external threading;
- one or more rollers disposed about the rod, each roller having (i) internal threading engaged with the external threading of the rod, and (ii) external threading;
- an outer ring having internal threading engaged with the external threading of each of the one or more rollers;
- and
- a shock absorber disposed about the rod and axially proximate to the outer ring, wherein the shock absorber is configured to axially compress when subjected to an axial shock load to inhibit the rod from being mechanically overloaded.
Dependencies are inferred from the claim text.