DE102014201857A1 - Electromechanical rotary actuator - Google Patents

Abstract

Electromechanical rotary actuator (1) comprising a stator (2), a rotor (3) and at least one electrical coil, the rotor (3) being rotatable in a limited manner relative to the stator (2) between a first end position and a second end position, the at least one electric coil (4) arranged statorfest and the rotor (3) in current-carrying / -durchflossenen coil / -n (4) by means of a magnetic field in the direction of rotation can be acted upon, the rotor (3) a radially inside the stator (2) arranged ring section (5) in order to structurally and / or functionally improve the rotary actuator (1).

Description

The invention relates to an electromechanical rotary actuator having a stator, a rotor and at least one electrical coil, the rotor relative to the stator between a first end position and a second end position limited rotatable, arranged at least one electric coil statorfest and the rotor at stromdurchflossener / - through-flow coil / n can be acted upon by means of a magnetic field in the direction of rotation.

From the DE 10 2006 036 685 A1 a magnetic actuator is known for the direct generation of a rotary actuator movement of a shaft with currentless Endlagenfixierung comprising at least one designed as a ring segment and rotatably connected to the shaft permanent magnetic armature and at least two solenoid systems, each having a wound around a ferromagnetic core coil, wherein the at least two electromagnetic systems and the at least one permanent magnet armature in a ring segment or as a ring formed, magnetically conductive pole tube or on a circular path are arranged coaxially to the shaft, wherein the at least one permanent magnetic armature between two electromagnetic systems is arranged and wherein the length of the circular segment between the solenoid systems is greater than the length of the arranged between the solenoid systems armature in the circumferential direction to a movement of the armature along a circular path segment between the Elektromagnetsyste men according to their energization to allow.

From the DE 10 2011 082 169 A1 a parking brake device of a motor vehicle transmission is known, comprising a gear housing with housing wall, a parking lock gear, a parking pawl, a parking lock bolt for supporting the parking pawl and a locking element, arranged at the side of the parking pawl connected to the transmission housing carrier plate and that the parking lock bolts on the one hand in the support plate and on the other hand supported in the transmission housing.

The invention has for its object to improve a rotational actuator mentioned above structurally and / or functionally. In particular, a rotary actuator is to be provided which can be used as a parking lock actuator. In particular, a rotary actuator is to be provided, which can be arranged concentrically with a parking lock wheel. In particular, an electrically operable rotary actuator is to be provided. In particular, a rotary actuator is to be provided which has a reduced number of parts. In particular, a rotary actuator is to be provided which has a reduced space requirement. In particular, a rotary actuator is to be provided, which can be used in systems without hydraulic supply.

The object is achieved with an electromechanical rotary actuator having a stator, a rotor and at least one electrical coil, wherein the rotor relative to the stator between a first end position and a second end position limited rotatable, arranged at least one electric coil statorfest and the rotor at current-carrying / -supplied coil / -n can be acted upon by means of a magnetic field in the direction of rotation, wherein the rotor has a radially disposed inside the stator ring portion.

The first end position and the second end position can define a rotation range of the rotary actuator. The rotary actuator may be rotatable over an angular range of about 5 ° to 25 °, in particular of about 10 ° to 20 °, in particular of about 15 °. The stator may have a ring-segment-like shape. The stator can cover an angular range of more than 180 °, in particular about 250 ° to about 290 °, in particular about 270 °. The stator can surround the rotor like a clip. The stator may comprise a high permeability material, especially iron. The stator may have at least one coil section. The at least one electrical coil may be arranged on the at least one coil section. The at least one electrical coil may surround the stator at the at least one coil section. The rotary actuator may have a plurality of coils, in particular two coils. The ring portion of the rotor may be closed annularly. The rotor may be rotatably mounted on the stator. The rotor may comprise a high permeability material, especially iron.

The stator may have at least one pole piece arranged radially on the inside and the rotor may have at least one pole shoe arranged radially on the outside. The pole shoes can serve to allow magnetic field lines to pass through and distribute in a defined form when current / current flows through the coil. The at least one stator-side pole piece may have a ramp-like shape. The stator may have several, in particular three, pole shoes. The pole pieces of the stator can be in the circumferential direction be evenly distributed, in particular 3 × 120 °. The pole shoes and the coil sections may be alternately arranged on the stator. The at least one rotor-side pole piece may have a hook-like shape. The rotor can have several, in particular three, pole shoes. The pole shoes of the rotor can be distributed uniformly in the circumferential direction, in particular 3 × 120 °. The at least one stator-side pole piece and the at least one rotor-side pole piece may have mutually facing planar surfaces in the direction of rotation. In the second end position, the flat surfaces of the at least one stator-side pole piece and the at least one rotor-side pole piece can rest against one another. The flat surfaces of the at least one stator-side pole piece and the at least one rotor-side pole piece can form at least one stop in the second end position.

The stator may have a dip level on the at least one pole piece. The dipping stage can have a decreasing material thickness starting from the at least one pole shoe. The immersion stage may be arranged on the at least one stator-side pole piece radially outside the at least one rotor-side pole piece. Alternatively or additionally, it is also possible for the immersion stage to be arranged on the at least one stator-side pole shoe radially on the inside of the at least one rotor-side pole shoe. Also alternatively or additionally, the immersion stage can also be arranged on the at least one stator-side pole piece axially on the outside of the at least one rotor-side pole piece. The immersion stage may extend over an angular range which corresponds at least approximately to a rotation range of the rotary actuator. The immersion stage may extend over an angular range of approximately 5 ° to 25 °, in particular of approximately 10 ° to 20 °, in particular of approximately 15 °. With the aid of the immersion stage, the rotary actuator can perform a large turning distance with high force at the same time.

The rotor may be spring-loaded in the direction of the first end position. For this purpose, the rotary actuator may have at least one spring. The at least one spring may be a coil spring. The at least one spring may be a compression spring. The at least one spring may be a coil spring. The at least one spring may be a leaf spring. Thus, the rotary actuator may have a preferred position in the case of a current that is not energized / de-energized. It is guaranteed failure safety.

The rotor may be permanentlymagnetkraftbeaufschlagt in the second end position. For this purpose, the rotary actuator may have at least one permanent magnet. The at least one permanent magnet may be arranged on the at least one pole piece of the stator and / or on the at least one pole piece of the rotor. The at least one permanent magnet may be arranged on the flat surfaces of the at least one stator-side pole piece and / or the at least one rotor-side pole piece. In the case of a through-current / through-flow coil / -n, a magnetic force directed counter to the at least one permanent magnet can be generated.

The ring portion of the rotor may have a locking cam radially inwardly. The locking cam can be asymmetric. The locking cam may have a leading edge and a trailing edge. The ring portion may be adapted to receive a parking lock gear and a parking pawl. The parking pawl can be displaced between a blocking position and a release position. In the locked position, the parking pawl lock a rotation of the parking lock gear. By means of the locking cam, a displaceability of the parking pawl can be blocked. By means of the locking cam, the parking pawl can be locked in its locked position. In the first end position of the rotor, a displaceability of the parking pawl can be released. In the second end position of the rotor, the parking pawl can be locked in its locked position.

In summary and in other words, the invention thus provides inter alia a parking brake actuator in the form of a rotating locking unit. The Parksperrenaktor may have a stator, a rotor, coils and optionally in addition a return spring, which holds the stator in the de-energized state in an open basic position. The stator can be designed with immersion stages, which enable the rotor to carry out a large rotational distance with simultaneous high force. If the coils are energized, the spring force can be overcome and the rotor can turn into a mechanical end stop. When the coil energization is removed, the prestressed spring accumulator can turn back the rotor to its basic position. In addition, a permanent magnet can be integrated in the actuator, which can hold the rotor in its mechanical end stop even with de-energized coils. To loosen the rotor again, a magnetic flux can be generated by the coils, which acts opposite to the magnetic flux of the permanent magnet. As a result, the resulting overall magnetic flux or holding force can be weakened such that the prestressed spring accumulator rotates the rotor back into its open basic position. The actuation of the parking lock can be done via a cam. By the rotation of the rotor, a position of the cam can be adjusted, whereby a locking mechanism is actuated, for example, a parking lock pawl locked with a parking lock gear form-fitting manner.

The rotary actuator according to the invention can be used as a parking lock actuator. Here he serves to actuate a vehicle parking lock. The rotary actuator is concentric with a Parking lock wheel can be arranged. The rotary actuator is electrically operable. The rotary actuator has a reduced number of parts. The rotary actuator has a reduced space requirement. The rotary actuator can be used in systems without hydraulic supply.

A parking lock is used in a motor vehicle, such as a passenger or commercial vehicle, to secure it against rolling. For this purpose, the parking brake in the drive train of the vehicle, such as in a multi-step transmission of the vehicle, be integrated. The parking lock locks, i. locks the drive train in the engaged state and releases it in the designed state, i. unlock him. The Parkperrenaktuator serves to actuate the parking brake, i. for insertion and / or laying out.

Hereinafter, an embodiment of the invention will be described with reference to figures. From this description, further features and advantages.

They show schematically and by way of example:

1 a parking lock actuator with a stator, a rotor and electric coils in the release position,

1a a section of an alternative parking lock actuator,

2 a parking lock actuator with a stator, a rotor and electric coils in blocking position,

3 a parking lock actuator with permanent magnets and

4 a Parksperrenaktuator with a stator, a rotor and electric coils in perspective view.

1 and 2 show a parking lock actuator 1 with a stator 2 a rotor 3 and electric coils 4 , The parking lock actuator 1 is used to actuate a parking lock, not shown here, of a motor vehicle (see also 4 ). The parking lock has a parking lock gear. The parking lock gear is non-rotatably connected to an output shaft of a transmission of the motor vehicle. The parking lock has a parking pawl. The parking lock gear and the parking pawl have corresponding engagement sections. The parking pawl is pivotally mounted between a locking position and a release position on a housing of the transmission. In the locked position engage the engaging portions of the parking lock pawl and the parking lock gear into each other, so that the transmission locked on the output side and rolling away of the motor vehicle is prevented. In the release position, the engagement portions of the parking pawl and the parking lock gear do not engage with each other, so that the transmission is released and the motor vehicle can roll.

The parking lock actuator 1 serves to lock the parking pawl in its locked position or release the parking pawl to pivot into its release position. 1 shows the parking lock actuator 1 in release position. 2 shows the parking lock actuator 1 in locked position. The parking lock actuator 1 is concentric with the parking lock wheel can be arranged. The parking lock actuator 1 is so arranged that the parking lock gear and the parking pawl radially within the rotor 3 are arranged.

The rotor 3 has a closed ring section 5 on. At the ring section 5 is radially inside a locking cam 6 arranged. The locking cam 6 may alternatively also axially on the outside of the ring section 5 be arranged. The locking cam 6 serves to lock the parking pawl in its locked position. The rotor 3 is relative to the stator 2 between a first end position, the release position of the parking lock actuator 1 corresponds, and a second end position, the blocking position of the Parksperrenaktuators 1 corresponds, rotatable. At the ring section 5 are arranged radially outside three hook-like extensions, the pole pieces 7 of the rotor 3 form. The pole shoes 7 each have one in the circumferential direction of the rotor 3 directed flat surface. The pole shoes 7 are arranged distributed uniformly in the circumferential direction. This results in relation to a rotational axis of the rotor 3 between the pole pieces 7 in each case an angle of about 120 °.

The stator 2 has a ring-segment-like shape. The stator 2 covers an angular range of about 270 ° in the present case. In the area of the pole shoes 7 is the stator 2 reset radially outward. These are receiving spaces for the pole pieces 7 educated. At the stator 2 are radially inwardly present three pole pieces 8th arranged with the pole pieces 7 correspond. The pole shoes 8th each have one in the circumferential direction of the rotor 3 directed flat surface, the surfaces of the pole pieces 7 directed against. In the present case, the stator has two coil sections 9 on. The coil sections 9 are each between the pole pieces 8th arranged. The spools 4 are stator fixed to the coil sections 9 arranged.

There may also be a larger or smaller number of pole shoes 7 . 8th be provided. The position of the pole pieces 7 . 8th in the circumferential direction on the stator 2 and rotor 3 can also be different, In particular, it can be adapted to the respective installation conditions of the parking lock actuator 1 be adjusted.

At the pole shoes 8th of the stator 2 are diving levels 10 arranged. The diving levels 10 are each axially outside the pole pieces 7 arranged, in particular on one or both axial outer sides of the pole pieces 7 (please refer 4 ). The diving levels 10 are each from the flat surfaces of the pole pieces 8th directed away. The diving levels 10 each have a decreasing material thickness starting from the at least one pole piece.

For current-carrying coils 4 a magnetic field is generated. At the pole shoes 7 . 8th this results in an increased field line density. The magnetic field causes the rotor to be acted upon 3 in the direction of the blocking position of the parking lock actuator 1 , In the locked position serve the flat surfaces of the pole pieces 7 . 8th as attacks. The diving levels 10 influence the magnetic field lines such that a large angle of rotation of about 15 ° is possible at the same time high power. The rotor 3 can by a spring force in the direction of the release position of the parking lock actuator 1 be charged. For turning the rotor 3 in the direction of the blocking position, the spring force is then overcome. Without exposure to the magnetic field, the rotor twists 3 then independently in the release position.

1a showed an opposite to the execution according to 1 and 2 slightly modified version of the parking lock actuator 1 , According to 1a are the diving levels 10 each radially outside of the pole pieces 7 arranged. Again, the diving levels 10 each from the flat surfaces of the pole pieces 8th directed away (here in the radial direction). The diving levels 10 each have a decreasing material thickness starting from the at least one pole piece. It can also be provided that a parking lock actuator 1 at least one axial immersion stages 10 according to 1 and at least one radial immersion stage 10 according to 1a , In addition, it may be provided that the immersion levels 10 radially inside of the pole pieces 7 is arranged (not shown). The parking lock actuator 1 can also at least one diving level 10 have, both axially on the outside of the pole pieces 7 is arranged, as well as radially on the outside and optionally also radially inside. Such a diving level 10 forms, for example, a combination of immersion levels 10 out 1 and 1a ,

3 shows a parking lock actuator 1 with permanent magnets 11 , The permanent magnets 11 are on the pole shoes 7 of the rotor 3 arranged. This turns the rotor 3 in the locked position of the parking lock actuator 1 kept de-energized. To solve the coils 4 energized so that the permanent magnet 11 opposite magnetic field results and the holding force of the permanent magnets 11 is overcome. Incidentally, in addition to particular 1 and 2 and the associated description.

4 shows a parking lock actuator 1 with a stator 2 a rotor 3 and electric coils 4 in perspective view. In the execution according to 4 are the diving levels 10 each axially laterally of the pole pieces 7 . 8th arranged. Again, permanent magnets 11 on the pole shoes 7 of the rotor 3 arranged. Analogous to 3 becomes through this the rotor 3 in the locked position of the parking lock actuator 1 kept de-energized.

A gear-shaped parking lock gear 12 is located radially inside the rotor 3 , The parking lock wheel 12 is rotatably connected to a vehicle drive train, not shown, for example, a transmission shaft. A swiveling parking pawl 13 serves to engage and disengage the parking brake. In the engaged state, ie in the locked position, is the parking pawl 13 in the direction of the parking lock wheel 12 pivoted and lies between tooth flanks of the parking lock gear 12 positively on this. This engage engaging portions of the parking pawl 13 and the parking lock wheel 12 into each other. This is the parking lock gear 12 and thus the vehicle drive train is blocked against rotation. In the laid out condition, ie in the release position, the parking pawl is 13 from the parking lock wheel 12 pivoted away. This is the parking lock gear 12 solved. Thus, a relative rotation between the parking lock gear 12 and the remaining parking lock actuator 1 respectively. Actuating the parking lock, ie pivoting the parking pawl 13 in the respective position by means of the parking lock actuator 1 , In detail, this is done by the locking cam 6 during a rotation of the rotor 3 on a radial outside of the parking pawl 13 slides. Depending on the direction of rotation of the rotor 3 this is then pivoted to the respective position. Incidentally, in addition to particular 1 and 2 and 3 and the associated description.

Basically, the in 1 to 4 shown actuator 1 be used for purposes other than to operate a parking brake.

LIST OF REFERENCE NUMBERS

1

Parksperrenaktuator

2

stator

3

rotor

4

Do the washing up

5

ring section

6

locking cam

7

pole

8th

pole

9

coil section

10

dive stage

11

permanent magnet

12

parking gear

13

Parking pawl

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 102006036685 A1 [0002]
• DE 102011082169 A1 [0003]

Claims (10)

Electromechanical Rotary Actuator ( 1 ) comprising a stator ( 2 ), a rotor ( 3 ) and at least one electrical coil, wherein the rotor ( 3 ) relative to the stator ( 2 ) rotatable limited between a first end position and a second end position, the at least one electrical coil ( 4 ) arranged stator fixed and the rotor ( 3 ) in the case of a current-carrying coil / -n ( 4 ) is acted upon by means of a magnetic field in the direction of rotation, characterized in that the rotor ( 3 ) one radially inside the stator ( 2 ) arranged ring section ( 5 ) having. Rotary actuator ( 1 ) according to claim 1, characterized in that the stator ( 2 ) at least one radially inwardly disposed pole piece ( 8th ) and the rotor ( 3 ) at least one radially outwardly disposed pole piece ( 7 ) having. Rotary actuator ( 1 ) according to claim 2, characterized in that the at least one stator-side pole piece ( 8th ) and the at least one rotor-side pole piece ( 7 ) have mutually facing in the direction of rotation flat surfaces. Rotary actuator ( 1 ) according to at least one of claims 2-3, characterized in that the stator ( 2 ) on the at least one pole piece ( 8th ) a diving level ( 10 ), which starting from the at least one pole piece ( 10 ) has a decreasing material thickness. Rotary actuator ( 1 ) according to claim 4, characterized in that the immersion stage ( 10 ) radially and / or axially on the outside and / or radially inside to the at least one pole piece ( 8th ) is arranged. Rotary actuator ( 1 ) according to at least one of the preceding claims, characterized in that the rotor ( 3 ) is spring-loaded in the direction of the first end position. Rotary actuator ( 1 ) according to at least one of the preceding claims, characterized in that the rotor ( 3 ) is in the second end position permanentmagnetkraftbeaufschlagt. Rotary actuator ( 1 ) according to at least one of the preceding claims, characterized in that the ring section ( 5 ) radially inside a locking cam ( 6 ) having. Rotary actuator ( 1 ) according to at least one of the preceding claims, characterized in that the ring section ( 5 ) for receiving a parking lock gear ( 13 ) and a parking pawl ( 12 ) suitable is. Parking lock actuator ( 1 ) for actuating a vehicle parking lock, carried out according to one of the preceding claims.

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