Electromagnetic actuating device
AssigneeRobert Bosch GmbH
InventorsKlaus Schudt, Tilo Hofmann
Life of this patent
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Abstract
An electromagnetic actuating device includes a pole tube that is substantially cylindrical overall, an armature situated radially inside the pole tube, and an electromagnetic coil situated radially outside the pole tube, the pole tube having a first axial end and a second axial end. The pole tube is configured as a sleeve that is stamped and is brought into its shape by reshaping, the sleeve having, close to its first axial end, openings that extend in the circumferential direction.
Claims22
An electromagnetic actuating device, comprising:
- a pole tube, which is substantially cylindrical overall;
- an armature situated radially inside the pole tube so that the pole tube extends in a circumferential direction around the armature;
- and
- an electromagnetic coil situated radially outside the pole tube;
- wherein:
- the pole tube has a first axial end and a second axial end;
- the pole tube includes a sleeve that is stamped and is brought into its shape by reshaping;
- the sleeve includes plurality of openings;
- and
- at least one of the following two features (a)-(b):
- (a) for each respective one or more of the plurality of openings, a respective length of the respective opening extends in the circumferential direction closer to the first axial end of the pole tube than to the second axial end of the pole tube;
- and
- (b) at least some of the plurality of openings are arranged adjacent to each other in a single row, the single row extending in the circumferential direction.
An electromagnetic actuating device comprising:
- a pole tube, which is substantially cylindrical overall;
- an armature situated radially inside the pole tube;
- and
- an electromagnetic coil situated radially outside the pole tube;
- wherein:
- the pole tube:
- has a first axial end and a second axial end;
- and
- includes a sleeve that is stamped and is brought into its shape by reshaping;
- and
- the sleeve:
- includes openings that extend in a circumferential direction close to the first axial end;
- and
- has a fiberglass foil that is coated with PTFE on its inner circumference at least in some segments or completely, for the guiding of the armature.
An electromagnetic actuating device comprising:
- a pole tube, which is substantially cylindrical overall;
- an armature situated radially inside the pole tube;
- and
- an electromagnetic coil situated radially outside the pole tube;
- wherein:
- the pole tube:
- has a first axial end and a second axial end;
- and
- includes a sleeve that (a) is stamped, (b) is brought into its shape by reshaping, and (c) includes a plurality of openings close to the first axial end;
- and
- at least one of the following:
- (i) the openings are configured in a plurality of rows of openings, each of the rows extending in a circumferential direction of the pole tube;
- and
- (ii) for two immediately adjacent ones of the openings separated from each other by a web connection formed of a portion of the sleeve that separates the two immediately adjacent ones of the openings, respective lengths of each of the two immediately adjacent ones of the openings in the circumferential direction are at least 50 percent of a length of the web connection.
Dependencies are inferred from the claim text.