Electromagnetic actuator as well as actuating system

Abstract

An electromagnetic positioning device (1), having a stationary spool unit (9), having a moveably guided anchor (2), which forms a positioning section (14) and which can be axially displaced along a displacement axis (V) in response to supplying the spool unit (9) with current, as well as having a one-part cup-shaped yoke-core element (3), which receives the anchor (2) and which includes a core section (5) as well as a yoke section (6) and which has a yoke-core bottom (4) extending perpendicular to the displacement axis (V) and a yoke-core sheath extending perpendicular to the yoke-core bottom (4) along the displacement axis (V), a longitudinally cut transition area (8) reduced in thickness and arranged between the core section (5) and the yoke section (6) being realized in the yoke-core sheath. It is intended that a guide pin (17) for the anchor (2) is fixed, preferably pressed in, in a, preferably centric, guide pin recess (18) in the yoke-core bottom (4) and protrudes axially into a, preferably centric, guide opening (13) of the anchor (2) and can be displaced relative to the anchor (2) during its displacement movement.

Claims

1. An electromagnetic positioning device (1), having a stationary spool unit (9), having a moveably guided anchor (2), which forms a positioning section (14) and which can be axially displaced along a displacement axis (V) in response to supplying the spool unit (9) with current, as well as having a one-part cup-shaped yoke-core element (3), which receives the anchor (2) and which comprises a core section (5) as well as a yoke section (6) and which has a yoke-core bottom (4) extending perpendicular to the displacement axis (V) and a yoke-core sheath extending perpendicular to the yoke-core bottom (4) along the displacement axis (V), a longitudinally cut transition area (8) reduced in thickness and arranged between the core section (5) and the yoke section (6) being realized in the yoke-core sheath, wherein a guide pin (17) for the anchor (2) is fixed in a guide pin recess (18) in the yoke-core bottom (4) and protrudes axially into a guide opening (13) of the anchor (2) and can be displaced relative to the anchor (2) during its displacement movement.

2. The electromagnetic positioning device (1) according to claim 1, wherein on the yoke-core element (3), a sliding bearing (21) is fixed for guiding the anchor (2) on its outer circumference.

3. The electromagnetic positioning device according to claim 1, wherein an anti-twist pin (16) extending parallel to the guide pin (17) is arranged adjacent to the guide pin (17) and is fixed in an anti-twist pin recess (19) in the yoke-core bottom (4).

4. The electromagnetic positioning device according to claim 1, wherein the yoke-core bottom (4) forms a direct or indirect axial terminal abutment for the anchor (2) or a support surface for an abutment attenuation element.

5. The electromagnetic positioning device according to claim 1, wherein the anchor (2) is axially arranged between the yoke-core bottom (4) and a washer element (25) penetrated by the anchor (2), said washer element (25) being fixed in an inner circumferential groove (26) of the yoke-core element (3).

6. The electromagnetic positioning device according to claim 5, wherein the washer element (25) is realized as a spring lock washer.

7. The electromagnetic positioning device (1) according to claim 1, wherein on the anchor (2), an abutment attenuation element is fixed via which the anchor (2) is supported in at least one terminal abutment position on an immobile component.

8. The electromagnetic positioning device according to claim 1, wherein in its positioning section (14), the anchor (2) carries a rolling bearing (15) realized as a ball bearing.

9. The electromagnetic positioning device according to claim 1, wherein the anchor (2) is made of multiple parts and comprises a guide section (12), which comprises the guide opening (13) and on which a push rod section, which comprises the positioning section (14) and which is made of one or multiple parts and has a smaller diameter than the guide section (12), is fixed.

10. The electromagnetic positioning device according to claim 1, wherein the spool unit (9) is supplied or can be supplied with current via a control in such a manner that the anchor (2) moves axially along the displacement axis towards the yoke-core bottom (4) upon supply with current.

11. The electromagnetic positioning device according to claim 1, wherein the yoke-core element (3) and the spool unit (9) are arranged in a current-conductive casing (10).

12. A positioning system, comprising an electromagnetic positioning device (1) according to claim 1, as well as a positioning partner, which is realized in the anchor (2) so as to introduce a torque around the displacement axis (V) via a rolling bearing (15) fixed on the anchor (2).

13. The electromagnetic positioning device according to claim 1, wherein an internal sliding bearing is arranged on the anchor (2) in order to axially guide the anchor (2) on the outer circumference of the guide pin (17).

14. The electromagnetic positioning device according to claim 2, wherein the sliding bearing (21) is fixed on the inner circumference of the yoke section (6).

15. The electromagnetic positioning device according to claim 6, wherein the spring lock washer is made of a material which does not conduct magnetic flow.

16. The electromagnetic positioning device according to claim 15, wherein the material is bronze.

17. The electromagnetic positioning device according to claim 9, wherein the guide opening (13) is a through opening.

18. The electromagnetic positioning device according to claim 9, wherein the push rod section is fixed in the guide opening (13).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following,

(2) FIG. 1 illustrates a perspective longitudinal cut of a preferred exemplary embodiment of an electromagnetic positioning device realized according to the invention,

(3) FIG. 2 illustrates an alternative preferred embodiment of a positioning device according to the invention having an axial abutment attenuation element fixed in a guide opening as well as having an internal sliding bearing, and

(4) FIG. 3 illustrates another alternative preferred embodiment having abutment attenuation elements provided on both axial sides of the anchor.

(5) In the figures, the same elements and elements having the same function are denoted with the same reference number.

DETAILED DESCRIPTION

(6) In FIG. 1, an electromagnetic positioning device 1 realized according to the invention is illustrated; said electromagnetic positioning device 1 comprises a two-part anchor 2, which is arranged so as to be axially displaceable along a displacement axis V within a one-part yoke-core element 3, which is preferably designed in general as a rotation-symmetric rotational part.

(7) The yoke-core element 3 comprises a core section 5, which comprises a yoke-core bottom 4, for coupling the magnetic flow in the anchor as well as an essentially sleeve-shaped yoke section 6, which extends parallel to the displacement axis V and which radially surrounds the anchor 2 from the outside on the outer circumference.

(8) Besides the yoke-core bottom 4, the core section 5 comprises a sleeve-shaped cone section 7, which forms an axial section of a longitudinally cut transition area 8 reduced in thickness and arranged between the core section 5 and the yoke section 6. It can be seen that a spool unit 9 extends radially outward around the transition area 8.

(9) In the specific exemplary embodiment, the positioning device 1 is designed as a pull device and the anchor 2 has the function of a pull anchor so that when the spool unit 9 is supplied with current, the anchor 2 is displaced along the displacement axis V towards the yoke-core bottom. The yoke-core bottom forms a direct axial terminal abutment for delimiting the axial displacement axis in this specific exemplary embodiment.

(10) Preferably, a return spring, which can be supported on the anchor 2 on the front side and which is not illustrated, is provided for displacing the anchor 2 in the opposite axial direction (positioning direction).

(11) The yoke-core element 3 is received in a flow conductive, preferably cup-shaped casing 10 in conjunction with the spool unit 9 and is axially secured therein via a yoke washer 11, which is closely fit to the yoke section 6 from radially outward while simultaneously axially securing said yoke section 6 and carrying it between the yoke section and the casing 10 for a magnetic flow conduction.

(12) As previously mentioned the anchor 2 is designed in two parts and comprises a sleeve-shaped guide section 12, which is larger in diameter and which comprises a guide opening 13 realized as a through opening, in which a positioning section 14, which is realized as a push rod section of the anchor 2, is pressed in on an end side. The positioning section 14 carries an only partially illustrated rolling bearing 15 in its axial end section, a positioning partner being able to roll off on said rolling bearing 15 in the circumferential direction around the displacement axis V. In order to prevent a drag torque caused thereby from rotating the anchor 2 around the displacement axis V in the circumferential direction, an anti-twist pin 16 is provided which will be described further on.

(13) On the side facing away from the positioning section 14, an axial guide pin 17 protrudes in the guide opening 13 and is fixed in a centric guide pin recess 18 in the yoke-core bottom 4, said guide pin opening 18 being realized as a through opening, and is centrically penetrated by the displacement axis V, just like the centric guide opening 13. The guide pin 17 is made of a magnetic nonconductive material and serves for guiding the anchor 2 on the inner circumference of the guide opening 13.

(14) The aforementioned anti-twist pin 16 is arranged having a radial distance to the guide pin 17 and is held in an eccentrically arranged anti-twist pin recess 19 in the yoke-core bottom 4 by being pressed in, said anti-twist pin recess 19 also being realized as a through opening. The anti-twist pin 16 engages in an anti-twist pin opening 20, which is also realized as a through opening and which extends parallel to the centric guide opening 13, in the guide section of the anchor 2 and thus prevents the anchor 2 from rotating in the circumferential direction.

(15) Parallel to the anti-twist pin opening, a compensation opening (through opening), which has the same size in this example, is provided in the guide section 12 of the anchor 2 in order to compensate pressure between the cylinder spaces within the yoke-core element 3 delimited by the front sides of the guide section 12 upon a displacement movement.

(16) In order to guide the anchor 2, more specifically the guide section 12 on its outer circumference, a sliding bearing 21 realized as a sliding bearing connection is provided which is arranged on the inner circumference of the yoke section 6 of the yoke-core element 3. The sliding bearing 21 is axially secured by a step 23, which is realized on the inner circumference of the yoke-core element 3 and which abuts against a circumferential support surface 24 for the sliding bearing 21.

(17) The guide section 12 of the anchor 2 is axially secured in the yoke-core element 3 by a magnetically nonconductive washer element 25 which radially outward engages resiliently in an inner circumferential groove 26 in the yoke section 6. A centric opening 26 in the washer element 25 is penetrated by the push-rod-shaped positioning section 14 of the anchor 2; the guide section 12 of the anchor 2 can axially abut against the washer element 25, which functions according to the principle of a spring lock washer, with its front side facing away from the yoke-core body 4.

(18) The yoke-core element 3 of the illustrated positioning device 1 represents the basis of a multifunctional assembly, which carries the guide pin 17 fixed in the yoke-core bottom 4 and the anti-twist pin 16 also fixed in the yoke-core bottom 4 as well as the sliding bearing 21 for guiding the anchor 2 on its outer circumference. Furthermore, the yoke-core element 3 serves for holding the washer in a clamping manner, said washer being penetrated by the anchor 2 and delimiting the axial movement of the anchor 2 on the axial side facing away from the yoke-core bottom 4.

(19) The very compact design according to the invention enables using the available assembly space for increasing the magnetic performance.

(20) In the following, alternative embodiments also realized according to the invention are described, with particular emphasis on the differences to the embodiments according to FIG. 1. In order to avoid repetitions, the description of figures above is referred to regarding any similaripulls.

(21) The anchor 2 of the electromagnetic positioning device 1 according to FIG. 2 can be realized as having one part, for example. In this instance, the guide opening 13 is designed as a blind bore for receiving the guide pin 17, preferably as illustrated. In this blind bore, an abutment attenuation element 29 is pressed in, via which the anchor 2 can be supported on the guide pin 17 on the front side in a terminal abutment position, which is lower according to the drawing plane. In contrast to the exemplary embodiment described above, the yoke-core element 4 does not form a terminal abutment in the illustrated embodiment. This function of the terminal abutment is directly adopted by the guide pin 17.

(22) Another difference of the exemplary embodiment according to FIG. 2 is in the provision of an internal sliding bearing 30 (which can also be provided in the embodiment according to FIG. 1) additionally to the (external) sliding bearing 21 in this instance. The internal sliding bearing 30 is pressed in the guide opening 13 realized as a blind bore opening in a merely exemplary manner and thus moves axially in conjunction with the anchor 2 and guides the anchor 2 on the outer circumference of the centrically arranged guide pin 17 during this axial movement.

(23) In the alternative embodiment according to FIG. 3, another abutment attenuation element 31, designed circular in this instance for example, is arranged on the axial side of the anchor 2 facing away from the guide opening 13 or, in other words, on an axial side of the anchor 2 facing away from the yoke-core bottom 4 in addition to the abutment attenuation element 29 arranged in the guide opening 13 also realized as a blind bore opening in an exemplary manner. The abutment attenuation element 31 is pressed in an opening, which is shaped like a circular groove for example, in a circular shoulder of the anchor 2 and serves for attenuating the anchor abutment in its abutment position, which is higher according to the drawing, said anchor 2 being axially supported on the washer element 25 via the circular-groove-shaped abutment attenuation element 31 in said abutment position. In this embodiment according to FIG. 3, the internal sliding bearing 30 is also provided in order to guide the anchor on the outer circumference of the guide pin 17.

(24) It is explicitly noted that the features and functions added in FIGS. 2 and 3 can be combined individually and in any other combination with features of the respective other exemplary embodiments.

(25) Hence, the embodiment according to FIG. 3 can also be carried out having an anti-twist pin, for example, in order to prevent a rotation of the anchor 2, in particular should a rolling bearing be arranged on the anchor.

LIST OF REFERENCES

(26) 1 electromagnetic positioning device 2 anchor 3 yoke-core element 4 yoke core bottom 5 core section 6 yoke section 7 cone section 8 transition area 9 spool unit 10 casing 11 yoke washer 12 guide section 13 guide opening 14 positioning section 15 rolling bearing 16 anti-twist pin 17 guide pin 18 guide pin recess 19 anti-twist pin recess 20 anti-twist pin opening 21 sliding bearing 23 step 24 support surface 25 washer element 26 inner circumferential groove 27 opening 28 compensation bore 29 abutment attenuation element 30 sliding bearing 31 circular abutment attenuation element V displacement axis