DE102015224662A1 - Actuator with planetary roller screw drive (PWG) - Google Patents

Abstract

The invention relates to actuator with Planetenwälzgewindsspindeltrieb (PWG), in particular for the actuation of a clutch of a vehicle, wherein a plurality of planetary rollers are in engagement with a spindle, which mesh with a planetary roles surrounding ring gear, said planetary rollers having a first end in a first region and are mounted with a second end in a second region of a planetary roller carrier, wherein the sleeve and the planetary roller carrier axially fixed and rotatably connected to a rotor of a drive and driven about an axis of rotation, wherein the spindle is supported with respect to a stator of the drive and at Rotation of the rotor and supported in the sleeve planetary roller carrier performs an axial stroke, wherein the first region and / or the second region of the planetary roller carrier is at least partially formed integrally in a shell of the rotor / are.

Description

The invention relates to an actuator with Planetenwälzgewindespindeltrieb (PWG) and finds in particular for the operation of a clutch of a vehicle application.

Actuators can convert the rotational movement of a component into an axial movement of another component. The actuator itself can be any type of linear actuator, e.g. PWG actuator (PWG = planetary roller screw drive), hydraulic slave cylinder, etc.

Planetenwälzgewindetrieb (PWG) (also referred to as Planetenwälzgewindsspindeltriebe or as Planetenwälzgewindspindeln) are formed from a spindle, a spindle nut and arranged between them over the circumference, recorded in a planet carrier Planetenwälzkörpern. Here, the spindle, spindle nut and Planetenwälzkörper on profiling to transmit a rotational movement between the spindle and spindle nut, wherein one of the components - spindle or spindle nut - rotatably driven and the other component in a rotationally fixed arrangement along the longitudinal axis of the spindle by one of the set translation corresponding Axialweg is relocated. Here, the Planetenwälzkörper two different profile sections, which mesh on the one hand with the spindle and on the other hand with the spindle nut, the profile sections on the Planetenwälzkörper grooved and the other profile sections on the Planetenwälzkörper are generally grooved and depending on the embodiment, a complementary threaded portion on the spindle or the spindle nut and according to the groove portion is arranged on the other component.

Planetary roller screw drives (PWG) have been the state of the art for many years and are used, for example, in DD 0277308 A5 described. From the publication DE 10 2010 047 800 A1 For example, a Planetenwälzgewindetrieb is known, which is included in a Hydrostataktor in the form of a hydrostatic clutch actuator to convert a rotary motion generated by an electric motor into an axial movement. A Planetenwälzgewindetrieb, with a threaded spindle, and arranged with a threaded spindle on the nut, and with a plurality of circumferentially distributed between the threaded spindle and the nut arranged planetary, which are arranged abradably on the inner circumference of the nut and on the outer circumference of the threaded spindle, is pamphlet DE 10 2010 011 820 A1 known. In this solution, a biasing means for the planet is provided, wherein the nut has two mutually axially movable male parts, and wherein the biasing means comprises a sprung against the one female part spring element. The nut takes on two functions: on the one hand, it is gear part and on the other hand, it is part of the pretensioner. The DE 10 2014 202 118 A1 describes an actuator with Planetenwälzgewindetrieb, wherein the axial stroke of the spindle is induced by a rotatably connected to sleeve and planetary roller carriers in connection rotor.

All solutions known from the prior art have in common that the planetary rollers are mounted in two planetary roller carriers. Rotor assembly and PWG assembly are always separated. The rotor assembly is torque transmitting frictionally pressed onto the outer sleeve of the Planetenwälzgewindsspindeltriebes. The interference fit must be laid out in such a way that the engine torque is transmitted safely to the planetary roller screw drive. This requires good Maß-, form and position tolerances of the components involved and their surface quality. Furthermore, correspondingly high assembly forces are required for the joining of the two assemblies. This is reflected in correspondingly high costs.

The object of the invention is therefore to provide an actuator with Planetenwälzgewindespindeltrieb (PWG) available, in which the frictional interference fit between the rotor assembly and PWG assembly is not necessary.

This object is achieved with the characterizing features of the first claim.

Advantageous embodiments emerge from the subclaims.

The actuator has a planetary roller screw drive (PWG), and is used in particular for the actuation of a clutch of a vehicle, with a spindle of the PWG, several planetary rollers are engaged, which mesh with a ring gear surrounding the ring gear, the planetary rollers having a first end are mounted in a first region and with a second end in a second region of a planetary roller carrier, which is rotatably received in a ring surrounding the ring gear, wherein the sleeve and the planetary roller carrier axially fixed and rotatably connected to a rotor of a drive and driven about an axis of rotation are, wherein the spindle is supported with respect to a stator of the drive and performs an axial stroke upon rotation of the rotor and supported in the sleeve planetary roller carrier, wherein according to the invention, the first region and / or the second region of the planetary roller carrier at least partially e is integrally formed in a shell of the rotor.

As a result, at least one separately formed region or a separately formed component of the planetary roller carrier can be saved and thus the structural design of the actuator can be simplified.

The casing is preferably formed in the form of a rotor extrusion coating of the rotor, wherein a sensor magnet is accommodated in the rotor extrusion coating and wherein the sensor-side second end of the planetary rollers in the second region of the planetary roller carrier, in the rotor injection molding (US Pat. 6 ), is supported.

Furthermore, the planetary rollers are in a first length range with the spindle in engagement, which mesh in a second length range with a ring gear surrounding the ring gear, wherein the planetary rollers are positioned at the end closer to the first end portion in the first region of the planetary roller carrier, which rotatably in a ring surrounding the ring gear is supported and / or formed integrally with the sleeve, wherein the sleeve and the planetary roller carrier axially fixed and rotatably connected to a rotor of a drive and are driven about a rotational axis. The spindle is supported with respect to a housing and a stator of the drive, and performs an axial stroke on rotation of the rotor and the planetary roller carrier supported in the sleeve.

In particular, the first length range is different from the second length range, that is, the first and the second length range have different lengths.

The sensor-side end of the planetary rollers, which is mounted in the Rotorumspritzung, lies in the vicinity of the second length range, in which the contact of the planetary rollers to the ring gear takes place.

Particularly preferably, the rotor extrusion has on the inside a plurality of bearing points for positioning the planetary rollers in the circumferential direction about the spindle. These bearings are preferably indentations, in which the bearing pin of the planetary rollers can be accommodated.

Furthermore, the rotor extrusion, which forms the second region of the planetary roller carrier, have a plurality of bearing points for positioning the planetary rollers in the axial direction. In this case, the planetary rollers abut with their second ends on the end face on the second region of the second region of the planetary roller carrier formed in the rotor encapsulation.

Further preferably, the rotor extrusion is formed of plastic.

Advantageously, a component is saved by the inventive solution, which reduces production costs. Furthermore, can be omitted by the positive connection of the planet carrier shape of the torque transmitting interference fit of the rotor. Only a correspondingly good centering of the rotor on the SPWG must be ensured. As a result, the requirements for the dimensional tolerances and the surface finish are reduced.

The invention will be explained in more detail with reference to an embodiment and associated drawings, without being limited to these.

Showing:

1 a sectional view of an actuator according to the prior art;

2 a sectional view of an actuator according to the invention;

3 a sectional view of an actuator according to the invention;

4 a cross section of a Rotorumspritzung invention.

In an actuator according to the prior art, shown in 1 , are several planetary roles 1 in a first length range L ₁ with a spindle, not shown, in engagement. The spindle is supported with respect to a housing and a stator of a drive. In a second length range L ₂ comb the planetary rollers 1 with one the planetary roles 1 surrounding ring gear 2 , The planetary roles 1 are mounted at both ends in a planetary roller carrier, which in a first area 03.01 serves to receive an unspecified first end of the planetary rollers and in a second area 3.2 for receiving an unspecified second end of the planetary rollers 1 serves. The first area and the second area 03.01 . 3.2 the planetary roller carrier are formed as separate components. The planetary roller carrier is with its first area 03.01 and second area 3.2 rotatably in a ring gear 2 surrounding sleeve 4 supported. The sleeve 4 and the planetary roller carrier with its first and second areas 03.01 and 3.2 are axially fixed and rotatably connected to a rotor R of the drive and driven about a rotation axis A. The rotor R has a sensor magnet 5 on, which with a Rotorumspritzung 6 is overmoulded. The sleeve 6 and thus the rotor R are over a first bearing 7 rotatably mounted with respect to a stator, not shown here. The ring gear 2 relies on his bearing 7 opposite end to the sleeve 4 via a thrust bearing 8th from.

Upon rotation of the rotor R and in the sleeve 4 supported areas 03.01 . 3.2 of the planetary roller carrier 2 performs the spindle, not shown, an axial stroke. The rotor assembly is torque transmitting frictionally engaged on the sleeve 4 pressed, wherein the interference fit must be laid out so that the engine torque is transmitted securely to the Planetenwälzgewindsspindeltrieb.

The 2 and 3 each show a sectional view of an actuator according to the invention. Again, there are several planetary roles 1 in a first length range L ₁ with a spindle, not shown, in engagement. The spindle is supported with respect to a stator S (and a housing) of a drive. In a second length range L ₂ comb the planetary rollers 1 with the planetary roles 1 surrounding ring gear 2 , As in the prior art, the planetary rollers 1 with a first end at the end closer to the first length region L ₁ , ie, at the end which here towards the bearing 7 points, in a first area 03.01 the planetary roller carrier positioned. This in turn is rotationally fixed in a ring gear 2 surrounding sleeve 4 supported. The sleeve 4 and the first area 03.01 the planetary roller carrier are axially fixed and rotatably connected to a rotor R of the drive and driven about a rotation axis A. The rotor R has a sensor magnet 5 on, which with a Rotorumspritzung 6 is overmoulded. In contrast to the prior art, this is supported in the direction of the thrust bearing 8th and to the sensor magnet 5 pointing second end of the planetary rollers 1 in a second area 3.2 of the planetary roller carrier, which is not formed as a separate component but integrally in the Rotorumspritzung 6 is trained.

This is indicated by the rotor encapsulation 6 inside according to 2 several bearings for positioning the planetary rollers 1 in the circumferential direction around the spindle, which is the second area 3.2 form the planetary roller carrier.

In 3 the planetary rollers support themselves 1 at their on the side of the thrust bearing 8th arranged and towards the sensor magnet 5 pointing end axially frontally on the in the Rotorumspritzung 6 trained second area 3.2 of the planetary roller carrier.

4 shows a cross section of a Rotorumspritzung invention 6 according to 2 which is the first area in this area 03.01 the planetary roller carrier is formed and on the inside several bearings 9 has to position the planetary rollers, not shown here.

LIST OF REFERENCE NUMBERS

1

 planetary rollers

2

 ring gear

3.1

 first area of the planetary roller carrier

3.2

 second area of the planetary roller carrier

4

 shell

5

 sensor magnet

6

 Rotorumspritzung

7

 camp

7

 thrust

9

 bearings

A

 axis of rotation

L ₁

 first length range

L ₂

 second length range

R

 rotor

S

 stator

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

• DD 0277308 A5 [0004]
• DE 102010047800 A1 [0004]
• DE 102010011820 A1 [0004]
• DE 102014202118 A1 [0004]

Claims (9)

Actuator with Planetenwälzgewindespindeltrieb (PWG), in particular for the actuation of a clutch of a vehicle, wherein with a spindle a plurality of planetary rollers ( 1 ) engaged with one of the planetary rollers ( 1 ) surrounding ring gear ( 2 ), wherein the planetary rollers ( 1 ) with a first end in a first area ( 03.01 ) and with a second end in a second area ( 3.2 ) of a planetary roller carrier are mounted, which rotatably in a ring gear ( 2 ) surrounding sleeve ( 4 ), wherein the sleeve ( 4 ) and the planetary roller carrier axially fixed and rotatably connected to a rotor (R) of a drive and are driven about an axis of rotation (A), wherein the spindle is supported with respect to a stator (S) of the drive and upon rotation of the rotor (R) and in the sleeve ( 4 ) supported planetary roller carrier performs an axial stroke, characterized in that the first region ( 03.01 ) and / or the second area ( 3.2 ) of the planetary roller carrier is at least partially integrally formed in a sheath of the rotor (R) is / are. Actuator according to claim 1, characterized in that the casing in the form of a rotor encapsulation ( 6 ) of the rotor (R) is formed such that in the rotor encapsulation (R) a sensor magnet ( 5 ) and that the sensor-side second end of the planetary rollers ( 1 ) in the second area ( 3.2 ) of the planetary roller carrier, which is in the Rotorumspritzung ( 6 ), is supported. Actuator according to claim 1 or 2, characterized in that in a first longitudinal region (L ₁ ) with the spindle a plurality of planetary rollers ( 1 ) in a second length region (L ₂ ) with one of the planetary rollers ( 1 ) surrounding ring gear ( 2 ), wherein the planetary rollers ( 1 ) at the end closer to the first length region in a planetary roller carrier ( 03.01 ) are positioned, which rotatably in a ring gear ( 2 ) surrounding sleeve ( 4 ) is supported and / or in one piece with the sleeve ( 4 ) is trained. Actuator according to claim 3, characterized in that the first length range (L ₁ ) from the second length range (L ₂ ) is different. Actuator according to claim 1 or 2, characterized in that the sensor-side second end of the planetary rollers ( 1 ) is in the vicinity of the second length range (L ₂ ). Actuator according to one of claims 1 to 5, characterized in that the rotor encapsulation ( 6 ), which the second area ( 3.2 ) of the planetary roller carrier, several bearing points ( 7 ) for positioning the planetary rollers ( 1 ) in the circumferential direction. Actuator according to one of claims 1 to 5, characterized in that the rotor encapsulation ( 6 ), which the second area ( 3.2 ) of the planetary roller carrier, several bearing points ( 7 ) for positioning the planetary rollers ( 1 ) in the axial direction. Actuator according to Claim 7, characterized in that the planetary rollers ( 1 ) with its second ends at the end face on the second area ( 3.2 ) of the rotor formed in the second region ( 3.2 ) of the planetary roller carrier are supported. Actuator according to one of claims 1 to 8, characterized in that the rotor encapsulation ( 6 ) consists of plastic.

Images