DE102017125786A1 - Bistable linear magnet - Google Patents

Abstract

The invention relates to a bistable linear magnet (1) with a plunger core (3), which is arranged between two end positions movable back and forth in a housing (2). In order to reduce the outlay for the production and / or operation of bistable linear magnets, the housing (2) is subdivided into two electrically isolated housing bodies (11, 12) which contain electrically conductive stops (15, 16) for the immersion core (11). 3) in its two end positions.

Description

The invention relates to a bistable linear magnet with a plunger core, which is arranged between two end positions movable back and forth in a housing. The invention further relates to a parking lock with a parking lock wheel that can be locked with a holding actuator, in particular for an electric vehicle.

From the German patent application DE 102 07 828 A1 An electromagnetic solenoid with permanent magnet is known, comprising at least one stator and an excitation winding magnet system for generating a magnetic flux in the direction of movement of the magnet system opposite armature, which operates on a transmission element, wherein the armature has a polarized perpendicular to its direction of permanent magnet assembly. From the European patent application EP 2 587 496 A1 is a bistable solenoid having an excitation coil and a piston movable relative to the exciter coil by a switching current in the exciter coil into a first switching position and a second switching position, and having a piston position detector for detecting whether the piston is displaced to its first or second switching position; known. From the German patent application DE 10 2010 000 036 A1 A linear magnet is known, comprising: a cylindrical magnet housing made of a magnetic material; a cylindrical electromagnetic coil mounted in the magnet housing for generating a magnetic force when supplied with electric current; a plunger core, movably received in the coil in the axial direction, of a magnetic material undergoing biasing in a reverse direction by biasing means. From the German patent application DE 102 59 893 A1 For example, a method and a device for actuating a parking lock of an automatically operated transmission are known, with a selection device for controlling an actuator which activates the parking brake, wherein a spring device is provided against which the selection device for activating the parking brake is movable, by means of the detection the movement of the selector, the actuator is activated to activate the parking brake and the selector is locked after the activation of the parking brake. From the German patent application DE 10 2004 021 981 A1 is a parking brake for an automated motor vehicle transmission with at least one spring memory for engaging the parking lock, with a release device for opening the parking brake and with a spring force from at least one spring counteracting arranged holding device for holding the parking brake in the open state, wherein the release device by a gear actuator is operable.

The object of the invention is to reduce the expense for the production and / or operation of bistable linear magnets with a plunger that is arranged between two end positions movable back and forth in a housing, in particular for use in a parking brake.

The object is achieved in a bistable linear magnet with a plunger core, which is arranged between two end positions movable back and forth in a housing, achieved in that the housing is divided into two electrically electrically isolated housing body, the electrically conductive stops for the plunger in his have both end positions. This provides, inter alia, the advantage that piston position detectors, as for example from the European patent application EP 2 587 496 A1 are known, can be omitted. A measurement of the two possible end positions or end points of the plunger core can advantageously be done internally. The two housing body of the two-part housing act as electrically conductive stops to detect the two end positions of the plunger within the two-part housing.

A preferred embodiment of the bistable linear magnet is characterized in that the plunger is axially displaceable in the housing by a bearing device made of an electrically insulating material. As a result, unwanted electrical contact via the bearing device with the housing is reliably prevented. The bearing device made of the electrically insulating material essentially has the shape of a straight circular cylinder jacket.

A further preferred embodiment of the bistable linear magnet is characterized in that the housing is divided by a preferably centrally arranged insulator body. The insulator body advantageously has substantially the shape of a circular ring with a rectangular ring cross section. The two housing bodies advantageously have substantially the shape of circular cylindrical jacket bodies, which are designed essentially the same and are closed at their ends remote from one another. Then, the two housing body may also be referred to as housing halves. One of the housing body is advantageously equipped with a central through hole through which a plunger extension is led out of the housing. The Tauchkernverlängerung advantageously represents an actuator.

Another preferred embodiment of the bistable linear magnet is characterized characterized in that a permanent magnet is arranged between the housing bodies and the plunger so that the permanent magnet has magnetic contact with both housing bodies. As a result, the desired holding function and / or bistability is made possible in a simple manner. The bearing device made of the electrically insulating material is arranged in the radial direction between the permanent magnet and the plunger core.

In a method for operating a bistable linear magnet described above, the above object is alternatively or additionally achieved in that both housing body and the plunger are electrically contacted, wherein a contact between the plunger and one of the housing body is detected as soon as the plunger core one of his two Occupies final positions. If the plunger core reaches one of its two end positions or end positions, the plunger core is magnetically held in this position and an electrical contact is made from the plunger core to the corresponding housing body. This contact can be detected by continuity testing on corresponding lines. A contacting of the plunger can be done for example by means of sliding contact or elastic connection.

The invention further relates to a housing body, a plunger core, a bearing device, an insulator body and / or a permanent magnet for a previously described bistable linear magnet. The parts mentioned are separately tradable.

The invention further relates to a parking brake with a parking lock wheel that can be locked with a holding actuator, in particular for an electric vehicle, wherein the holding actuator comprises a bistable linear magnet described above. The bistable linear magnet provides the advantage that it can be determined without additional sensor device, whether the parking lock gear is blocked by the holding actuator, or not. As a result, for example, an electric machine of a vehicle equipped with the parking brake motor vehicle, in particular an electric vehicle, be relieved.

A preferred embodiment of the parking brake is characterized in that the plunger core has at one end a locking element, which is led out of the housing and engages for blocking the parking lock gear in a recess of the parking lock gear. The blocking element is, for example, a plunger extension projecting out of the housing through a central through hole of one of the housing bodies. As soon as the blocking element engages in the recess of the parking lock gear, this is blocked, that is, the parking lock is activated or locked.

A further preferred embodiment of the parking brake is characterized in that the recess of the parking lock wheel has the shape of a slot. The slot is advantageously curved substantially circular arc. Through the slot, the threading of the locking element is simplified in the recess of the Parksperrenrads.

Another preferred embodiment of the parking brake is characterized in that the parking lock wheel has a plurality of recesses which are distributed uniformly over a circumference of the parking lock gear. The recesses are advantageously arranged radially within a toothing of the parking lock gear. The parking lock gear may be a gear wheel of a transmission of a vehicle equipped with the parking brake motor vehicle, in particular electric vehicle.

If appropriate, the invention also relates to a method for actuating a parking lock described above.

• 1 eine schematische Darstellung eines bistabilen Linearmagneten mit einem Tauchkern, der zwischen zwei Endpositionen hin und her bewegbar in einem Gehäuse angeordnet ist;
• 2 ein Ersatzschaltbild zu dem bistabilen Linearmagneten aus 1; und
• 3 eine Parksperre mit einem Parksperrenrad, das mit einem Halteaktor blockiert werden kann, der einen bistabilen Linearmagneten, wie er in den 1 und 2 dargestellt ist, umfasst.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

• 1 a schematic representation of a bistable linear magnet with a plunger, which is arranged between two end positions movable back and forth in a housing;
• 2 an equivalent circuit to the bistable linear magnet 1 ; and
• 3 a parking brake with a parking lock wheel, which can be blocked with a holding actuator, which is a bistable linear magnet, as in the 1 and 2 is shown.

In the 1 and 2 is a bistable linear magnet 1 with a housing 2 shown. In the case 2 is a diving core 3 movable between two end positions, as in 1 by a double arrow 18 is indicated.

In the case 2 are a first coil 4 and a second coil 5 arranged. The diving core 3 is radially inside the two coils 4 . 5 with the help of a storage facility 6 moved back and forth. The storage facility 6 is formed of an electrically insulating material.

The bistable linear magnet 1 includes a permanent magnet 7 , which is designed as a ring magnet. The permanent magnet 7 has a north magnetic pole and a south magnetic pole. The subdivision of the permanent magnet 7 with the both magnetic poles is in 1 indicated by two rectangles. The north pole is arranged, for example, radially outward. In the axial direction is the permanent magnet 7 between the two coils 4 and 5 arranged.

Radially outside the permanent magnet 7 is an insulator body 10 arranged. The insulator body 10 is how the storage facility 6 formed of an electrically insulating material. The insulator body 10 has the shape of a circular ring with a rectangular ring cross-section. In the axial direction is the insulator body 10 between two housing bodies 11 . 12 arranged.

The housing body 11 . 12 essentially have the shape of circular cylinders, which are the two coils 4 and 5 and the permanent magnet 7 surround. The housing body 11 . 12 have at their opposite ends end portions 13 . 14 on. The end section 13 is closed and with a stop 15 for a in 1 left end of the diving core 3 fitted. The housing body 12 is in the same way through an end section 14 with a stop 16 for a in 1 right end of the diving core 3 fitted.

The end section 14 of the housing body 12 has a central through hole 20 on, through which a Tauchkernverlängerung 19 of the diving core 3 out of the case 2 extends out. In the 1 and 2 takes the plunger core 3 its right end position.

The housing 2 with the two housing bodies 11 . 12 is to illustrate the bistability of the linear magnet 1 made of a ferromagnetic material. Through the insulator body 10 is the case 2 divided into two electrically isolated areas. The one for the bistability of the linear magnet 1 integrated permanent magnet designed as a ring magnet 7 has magnetic contact with the two housing bodies 11 . 12 , so that the bistability of the linear magnet 1 through the insulator body 10 is not affected.

Through the storage facility 6 From the electrically insulating material or material ensures that the plunger 3 in an intermediate position between its two end positions neither to the housing body 11 still to the housing body 12 has electrical contact.

By lowercase letters b and c is in the 1 and 2 indicated that the two housing body 11 . 12 be contacted electrically. By a lowercase letter a is in the 1 and 2 indicated that also the diving core 3 is contacted electrically. Reached the diving core 3 one of its two end positions, then becomes the diving core 3 magnetically held in this position or end position and there is an electrical contact from the plunger 3 to the corresponding housing body 11 . 12 , This contact can be made by continuity test on the lines a and depending on the end position or end position b or c be detected.

The contact of the diving core 3 can be done for example by means of sliding contact or elastic connection. The sliding contact is preferably arranged centrally.

By integrating the Endlagendetektierung or Endpositionsdetektierung can advantageously a housing for an otherwise required sensor unit and the mounting and connection of the same to the bistable linear magnet 1 omitted. This also results in a greater robustness against external influences, such as vibration, temperature et cetera.

In principle, the configuration can also be designed for unidirectional, unstable, monostable linear magnets or only with an end position sensor or end position sensor.

In 3 is a parking lock 30 with a bistable linear magnet 1 shown in perspective. The bistable linear magnet 1 includes an electrical connection device 31 , The diving core extension 19 represents a blocking element 33 the parking lock 30 dar. The blocking element 33 the parking lock 30 acts with a parking lock gear 35 together. At the parking lock wheel 35 it is advantageous to a transmission gear with a toothing 36 ,

The parking lock wheel 35 has radially inside the toothing 36 recesses 37 . 38 . 39 on. The recesses 37 to 39 have the shape of oblong holes.

In 3 grips the blocking element 33 into the recess 39 the parking lock wheel 35 one, so the parking lock gear 35 is blocked. The bistable linear magnet 1 with the blocking element 33 thus advantageously provides a holding reactor 40 the parking lock 30 dar. With the bistable linear magnet 1 can during operation of the holding actuator 40 are advantageously detected when the plunger in the housing 2 takes one of its two final positions.

LIST OF REFERENCE NUMBERS

1

bistable linear magnet

2

casing

3

plunger

4

first coil

5

second coil

6

Storage facility

7

permanent magnet

10

insulator body

11

housing body

12

housing body

13

end

14

end

15

attack

16

attack

18

double arrow

19

Plunger extension

20

Through Hole

30

parking lock

31

electrical connection device

33

blocking element

35

parking gear

36

gearing

37

recess

38

recess

39

recess

40

Halteaktor

a

Tauchkernkontaktierung

b

Endlagenkontaktierung

c

Endlagenkontaktierung

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10207828 A1 [0002]
• EP 2587496 A1 [0002, 0004]
• DE 102010000036 A1 [0002]
• DE 10259893 A1 [0002]
• DE 102004021981 A1 [0002]

Claims (10)

Bistable linear magnet (1) with a plunger (3), which is arranged between two end positions movable back and forth in a housing (2), characterized in that the housing (2) line technology in two electrically isolated housing body (11,12) is divided, the electrically conductive stops (15,16) for the plunger core (3) in its two end positions. Bistable linear magnet according to Claim 1 , characterized in that the plunger core (3) in the housing (2) by a bearing device (6) made of an electrically insulating material is axially displaceable. Bistable linear magnet according to one of the preceding claims, characterized in that the housing (2) is divided by a preferably centrally arranged insulator body (10). Bistable linear magnet according to one of the preceding claims, characterized in that a permanent magnet (7) between the housing bodies (11,12) and the plunger core (3) is arranged, that the permanent magnet (7) to both housing bodies (11,12) magnetic Contact has. Method for actuating a bistable linear magnet (1) according to one of the preceding claims, characterized in that both housing bodies (11, 12) and the plunger core (3) are electrically contacted, wherein a contact between the plunger core (3) and one of the housing bodies ( 11, 12) is detected as soon as the plunger core (3) assumes one of its two end positions. Housing body (11,12), plunger (3), bearing means (6), insulator body (10) and / or permanent magnet (7) for a bistable linear magnet (1) according to one of Claims 1 to 4 , Parking lock (30) with a parking lock wheel (35) which can be blocked with a holding actuator (40), in particular for an electric vehicle, characterized in that the holding actuator (40) comprises a bistable linear magnet (1) according to any one of Claims 1 to 4 includes. Parking lock after Claim 7 , characterized in that the plunger core (3) has at one end a locking element (33) which is led out of the housing (2) and for blocking the parking lock wheel (35) engages in a recess (39) of the Parksperrenrads (35). Parking lock after Claim 8 , characterized in that the recess (39) of the parking lock wheel (35) has the shape of a slot. Parking lock according to one of the preceding claims, characterized in that the parking lock wheel (35) has a plurality of recesses (37-39) which are preferably evenly distributed over a circumference of the parking lock wheel (35).

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