Electromagnetic actuating device and method for manufacturing an electromagnetic actuating device

1. A method for manufacturing an electromagnetic actuating device, the method comprising the following steps:

providing an electromagnetic coil including a central recess extending in an axial direction;

inserting a cylindrical pole tube provided with a magnetic separation point into the central recess;

manufacturing a sleeve-shaped bearing foil, the bearing foil being transferred from a flat starting shape into a sleeve shape with an outer side and an inner side used as a sliding surface;

inserting the sleeve-shaped bearing foil into the pole tube, the bearing foil facing toward the pole tube with the outer side; and

inserting an armature into the pole tube in such a way that the inner side of the bearing foil used as the sliding surface faces toward the armature;

wherein in the step of manufacturing, before the transformation into the sleeve shape, the bearing foil is coated on a side provided as the inner side of the later sleeve shape using a first layer made of a perfluoroalkoxy polymer,

wherein the sleeve-shaped bearing foil includes a glass fiber fabric saturated using PTFE as a carrier material, which is provided on the inner side and the outer side with a PTFE layer in each case, the first layer made of a perfluoroalkoxy polymer being applied at least to the PTFE layer on the inner side,

wherein the first layer made of perfluoroalkoxy polymer has a layer thickness of less than 5 μm.

2. The method as recited in claim 1 , wherein the bearing foil is additionally coated on a side provided as the outer side of the later sleeve shape using a second layer made of a perfluoroalkoxy polymer.

3. The method as recited in claim 1 , wherein the PTFE layer is coated on a side provided as the outer side of the later sleeve shape using a second layer made of a perfluoroalkoxy polymer.

4. An electromagnetic actuating device, comprising:

an electromagnetic coil including a central recess extending in an axial direction;

a cylindrical pole tube inserted into the central recess and provided with a magnetic separation point; and

an armature situated displaceably in the pole tube, the armature being movable by an actuation of the electromagnetic coil, the armature being mounted in the pole tube in a sleeve- shaped bearing foil inserted into the pole tube, the bearing foil including an inner side facing toward the armature and used as a sliding surface, and an outer side facing toward the cylindrical pole tube, wherein the bearing foil is coated at least on the inner side using a first layer made of perfluoroalkoxy polymer,

wherein the sleeve-shaped bearing foil includes a glass fiber fabric saturated using PTFE as a carrier material, which is provided on the inner side and the outer side with a PTFE layer in each case, the first layer made of a perfluoroalkoxy polymer being applied at least to the PTFE layer on the inner side,

wherein the first layer made of perfluoroalkoxy polymer has a layer thickness of less than 5 μm.

5. The electromagnetic actuating device as recited in claim 4 ,

wherein the sleeve-shaped bearing foil is additionally coated on the outer side using a second layer made of a perfluoroalkoxy polymer.

6. The electromagnetic actuating device as recited in claim 5 ,

wherein the second layer made of perfluoroalkoxy polymer has a layer thickness of less than 5 μm.

7. The electromagnetic actuating device as recited in claim 4 ,

wherein the pole tube is formed in one piece or multiple parts.

8. The electromagnetic actuating device as recited in claim 4 ,

wherein a total thickness of the bearing foil is between 25 μm and 75 μm.

9. The electromagnetic actuating device as recited claim 4 ,

wherein the electromagnetic actuating device includes a force transmission element displaceable in the axial direction, a force exerted by the armature being transmittable to the force transmission element.