Electromechanical actuator having design elements for improved oil guidance
AssigneeRobert Bosch GmbH
InventorsReiner Knoell, Marco Knoell, Michael Goldbach
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Abstract
A linear actuator includes a hermetically sealed housing, a cantilever that can be retracted into and extended out of the housing, and several components provided in the linear actuator. The components are configured so as to facilitate a flow of lubricating oil through the linear actuator, in particular when the cantilever is rapidly retracted and extended. This is achieved in that through-holes are provided in some components, through which lubricating oil and gas that has been filled into the housing can flow upon retraction and extension.
Claims12
A linear actuator, comprising:
- a housing;
- a cantilever, wherein the cantilever is borne along a longitudinal axis in a linearly movable manner in a first cavity of the housing and projects out of the housing, and wherein the cantilever comprises a second cavity and a threaded nut that engages in a screw-like manner with a threaded spindle, and wherein the threaded nut is configured to be borne in a torque-proof manner in the housing;
- a spindle pivot bearing in which the threaded spindle is borne in the housing at an end facing away from the cantilever;
- and
- a motor configured to rotate the threaded spindle,
- wherein the housing and the cantilever are configured to define a space that is hermetically sealed against the external atmosphere by way of seals and is filled with a fluid,
- wherein the fluid comprises compressible and incompressible constituents, and
- wherein two components are disposed in the space sealed against the external atmosphere, each component including at least one through-hole, respectively, which is open to the interior of the space for circulation of fluid therethrough upon a change of state of the linear actuator,
- wherein one of said two components is positioned between said threaded nut and said second cavity, and the other of said two components is positioned between said threaded nut and said end facing away from the cantilever.
A linear actuator, comprising:
- a housing;
- a cantilever, wherein the cantilever is borne along a longitudinal axis in a linearly movable manner in a first cavity of the housing and projects out of the housing, and wherein the cantilever comprises a second cavity and a threaded nut that engages in a screw-like manner with a threaded spindle, and wherein the threaded nut is configured to be borne in a torque-proof manner in the housing;
- a spindle pivot bearing in which the threaded spindle is borne in the housing at an end facing away from the cantilever;
- and
- a motor configured to rotate the threaded spindle,
- wherein the housing and the cantilever are configured to define a space that is hermetically sealed against the external atmosphere by way of seals and is filled with a fluid,
- wherein the fluid comprises compressible and incompressible constituents, and
- wherein one or more components are disposed in the space sealed against the external atmosphere, each including at least one through-hole, respectively, which is open to the interior of the space for circulation of fluid therethrough upon a change of state of the linear actuator,
- wherein said one or more components includes the threaded nut, in which the at least one through-hole includes at least one through-hole that extends parallel to the longitudinal axis of the linear actuator.
Dependencies are inferred from the claim text.