CN106065927B - Actuator with planetary roller screw drive (PWG) - Google Patents
Actuator with planetary roller screw drive (PWG) Download PDFInfo
- Publication number
- CN106065927B CN106065927B CN201610261904.9A CN201610261904A CN106065927B CN 106065927 B CN106065927 B CN 106065927B CN 201610261904 A CN201610261904 A CN 201610261904A CN 106065927 B CN106065927 B CN 106065927B
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- CN
- China
- Prior art keywords
- planetary roller
- planetary
- roller carrier
- sleeve
- actuator according
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
- F16D2023/123—Clutch actuation by cams, ramps or ball-screw mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0497—Screw mechanisms
Abstract
According to the invention, an actuator with a planetary roller screw drive (PWG), in particular for operating a clutch of a vehicle, is proposed, wherein a plurality of planetary rollers engage with a contour of a threaded spindle, which planetary rollers engage with a ring gear surrounding the planetary rollers in a first length region, wherein the planetary rollers extend axially parallel to the threaded spindle and are mounted on both ends in a first and a second planetary roller carrier in a freely rotatable manner about their own longitudinal axis, and the planetary roller carriers are supported in a rotationally fixed manner in a sleeve surrounding the ring gear, and wherein a friction element is arranged between the ring gear and the sleeve. According to the invention, the second planetary roller carrier is operatively connected to the friction element via the friction surface in a second axially extending length range.
Description
Technical Field
The invention relates to an actuator having a planetary roller screw drive (PWG) and is used in particular for actuating a clutch of a vehicle.
Background
The actuator is capable of converting rotational movement of one member to axial movement of the other member. Here, the actuator itself may be any type of linear actuator, for example, a PWG actuator (a planetary roller screw transmission mechanism), a hydraulic slave cylinder, or the like.
A planetary roller screw drive (PWM) or planetary roller spindle drive is formed from a spindle, a spindle nut and planetary rollers arranged between them on the circumference and accommodated in a planet carrier. The spindle, the spindle nut and the planetary roller body have a contour in order to transmit a rotational movement between the spindle and the spindle nut, wherein one of the components (spindle or spindle nut) is driven in rotation and the other component, when arranged rotationally fixed, is displaced along the longitudinal axis of the spindle with an axial displacement corresponding to a set transmission ratio. In this case, the planet roller body has two different profile sections which mesh on the one hand with the spindle and on the other hand with the spindle nut, wherein one profile section on the planet roller body is groove-shaped and the other profile section on the planet roller body is usually groove-shaped, and according to an embodiment a complementary thread section is provided on the spindle or spindle nut and the respective groove section on the other component.
EP 320621 a1 discloses, for example, a PWG in which the spindle has a thread and the spindle nut has a groove on which the planetary roller bodies roll by means of respective complementarily formed profile sections. In this case, the spindle, which is mounted axially fixedly and is driven in rotation, for example, by an electric motor, is rotated relative to the spindle nut, which is arranged in a rotationally fixed manner, so that the spindle nut is moved axially by force and by the friction-fitting rolling of the planet bodies in the grooves of the spindle nut. In this case, a movement proportional to the rotational speed of the screw is obtained in the axial displacement of the screw nut.
In particular in actuators such as Hydrostatic Clutch Actuators (HCAs), which operate with respect to a load, for example a Clutch characteristic curve, for example, efficiency-optimized spindle drives (for example PWGs) driven by an electric motor have the problem that, when a holding position is required, a holding current and thus a holding torque in the electric motor are required, since the spindle drive (for example in PWGs) is not self-locking. In the case of a PWG with a rotationally fixed ring nut in the HCA, when the spindle is driven, an axial movement (relative to the spindle) is intercepted at the ring nut, and an additional reduction of the spindle pitch takes place in the desired rolling movement (e.g. in a meshed planetary transmission/without slip), which can be freely selected within limits by varying the spindle and/or planetary roller diameter. A decisive disadvantage of such actuators is that they require a permanent stopping of the current or are unable to maintain position in the event of a current failure/fault (e.g. cable breakage, plug detachment). Therefore, there is a great risk in clutches that are pressed open by the actuator, i.e. the clutch is undesirably closed.
Furthermore, it is known to apply wrap springs, for example, to clutches. In a further, yet undisclosed technical solution of the applicant, an assembly is proposed with a friction device having at least two components rotatable relative to each other, in particular for operating a clutch of a vehicle, wherein a helical spring is provided between the components rotatable relative to each other, which spring influences the efficiency/friction when the components rotate relative to each other. The helical spring forms a wrap spring at least in some regions, which can be a single wrap spring, a double wrap spring or a wrap spring. The double wrap spring described here has two active regions, which are arranged axially one behind the other.
The solutions known from the prior art have in common that the wrap spring is surrounded by the PWG sleeve and has friction surfaces with said sleeve and with the ring gear of the PWG, respectively. The ring gear and the sleeve are made of steel, depending on the function. Since the friction partners at the friction areas have a high friction torque, steel-steel, even in combination with lubricants, the "corrosion" (cold welding) and thus increased wear and tear is to be taken into account, which can lead to a loss of function of the component until failure.
Disclosure of Invention
The aim is to solve the described disadvantages by means of suitable friction partners and functional integration.
The object is achieved by means of an actuator having a planetary roller screw drive (PWG). Advantageous design solutions are derived from the following.
The invention relates to an actuator having a planetary roller screw drive (PWG), in particular for actuating a clutch of a vehicle, wherein a plurality of planetary rollers engage with a contour of a spindle, which planetary rollers mesh with a ring gear surrounding the planetary rollers in a first length region. The planetary rollers extend axially parallel to the threaded spindle and are mounted at both ends in a first and a second planetary roller carrier in such a way that they can rotate freely about their own longitudinal axis. The planetary roller carrier is supported in a sleeve surrounding the ring gear in a rotationally fixed manner relative to the sleeve, wherein a friction element is arranged between the ring gear and the sleeve. According to the invention, the second planetary roller carrier is operatively connected to the friction element via the friction surface in a second axially extending length range.
The second planetary roller carrier has an axially extending region which is at least partially surrounded by a sleeve in the region of the friction surface. The second planetary roller carrier preferably has a centering surface for the sleeve on its outer diameter, via which the second planetary roller carrier is at least partially operatively connected to the inner diameter of the sleeve. Thereby, the radial stiffness is advantageously increased.
Alternatively, the sleeve and the second planetary roller carrier are formed in one piece.
The friction element is in particular a wrap spring, preferably a double wrap spring. The wrap spring is used in particular to influence the efficiency as a function of the direction of rotation.
In a preferred embodiment, the second planetary roller carrier is made of a plain bearing material, preferably plastic. This advantageously maintains a low inertia of the rotating component.
In order to improve the wear behavior of the second planetary roller carrier and the locking spring and to avoid poor lubrication, the second planetary roller carrier has at least one solid lubricant. Advantageously, the wear characteristics of the planetary rollers are thereby also improved.
For axial support in the sleeve, the second planetary roller carrier has at least one stop. In addition, the second planetary roller carrier can be axially fixed on the end face to the axial fixed plate. Small or occasional axial forces in the direction opposite to the main force direction are introduced at the end face from the planetary roller carrier into the axial holding plate. The axial fixing plate is preferably metallic.
The second planetary roller carrier has bearing points for positioning the planetary rollers in the circumferential direction around the screw, which ensure the positioning of the planets in the circumferential direction around the screw.
Advantageously, in the system, the frictional contact is lubricated by means of grease or similar lubricant.
Drawings
The invention is explained in detail below on the basis of exemplary embodiments and corresponding figures, without being restricted thereto.
Shown here are:
fig. 1 shows a longitudinal section through a planetary roller screw drive according to the prior art;
fig. 2 shows a longitudinal section through a planetary roller screw drive according to the invention;
fig. 3 shows a planetary roller carrier according to the invention.
Detailed Description
Fig. 1 shows a planetary roller screw drive (PWG) according to the prior art and fig. 2 shows a PWG according to the invention in longitudinal section. In both variants, a plurality of planetary rollers 2, which extend axially parallel to the longitudinal axis a of the screw 1 and mesh with a ring gear 3 surrounding the planetary rollers 2, engage with the contour of the screw 1. The planetary rollers 2 are mounted at both ends in a first planetary roller carrier 4 and a second planetary roller carrier 5 in a freely rotatable manner about their own longitudinal axis. The planetary roller carriers 4 and 5 are supported in a rotationally fixed manner in a sleeve 6 which surrounds the ring gear 3. A friction element 7 is provided between the ring gear 3 and the sleeve 6.
In planetary roller screw drives according to the prior art, as shown in fig. 1, the friction element 7 is directly operatively connected to the inner diameter (not labeled) of the sleeve 6 via a friction surface 8.1.
Fig. 2, in contrast, shows a planetary roller screw drive according to the invention, which is characterized in that the second planetary roller carrier 5 is designed such that it has a second length region L extending in the axial direction2Is arranged between the friction element 7 and the sleeve 6 and is in turn connected to the friction element 7 via the friction surface 8.2, effectively on the inner diameter, in the embodiment shown, the ring gear 3 is only still in the first length region L1Is in mesh with the planetary roller 2, the second planetary roller carrier 5 is axially supported in the sleeve 6 via the stop 9, the additional axial support of the second planetary roller carrier 5 is effected via the axially fixed plate 11, the friction element 7 is formed in the form of a wrap spring which is located in the second length region L2Is operatively connected to the inner diameter of the second planetary roller carrier 5 and, in the region of its axial connection thereto, is operatively connected with its inner diameter to the outer diameter of the ring gear 3.
Fig. 3 shows a second planetary roller carrier 5 according to the invention. The planetary roller carrier has a friction surface 8.2 on its inner diameter, via which it is operatively connected to a friction element, not shown here, of the PWG. On its outer diameter, the second planetary roller carrier 5 has a centering surface via which it is at least partially operatively connected to the inner diameter of the sleeve. Radially outwardly pointing on its outer diameter, the second planetary roller carrier 5 has a plurality of elevations 12 with axial stops 9 for axial support in a sleeve and a rotational support 12 for preventing the second planetary roller carrier 5 from twisting in a sleeve not shown here. The planetary rollers are supported in the planetary roller carrier 5 via the bearing points 10.
Since the second planetary roller carrier 5 is preferably made of a plain bearing material, steel-steel contact on the outer radius of the friction element, as is known from the prior art, is advantageously avoided. Wear and tear are minimized and the efficiency and life of the assembly is significantly improved.
List of reference numerals
1 screw rod
2 planetary roller
3 Gear ring
4 first planetary roller support
5 second planetary roller carrier
6 sleeve
7 Friction element/wrap spring
8.1 Friction surface (prior art)
8.2 rubbing surface
9 axial stop
10 support part
11 axial fixing plate
12 bump/rotation support
13 centering surface
L1First length region
L2Second length region
Longitudinal axis A
Claims (8)
1. Actuator with a planetary roller screw drive (PWG) for operating a clutch of a vehicle, wherein a plurality of planetary rollers (2) engage with a contour of a spindle (1), which planetary rollers mesh with a ring gear (3) surrounding the planetary rollers (2) in a first length region (L1), wherein the planetary rollers (2) extend axially parallel to a longitudinal axis (a) of the spindle (1) and are mounted on both ends in a first and a second planetary roller carrier (4, 5) in a freely rotatable manner about their own longitudinal axis, and the planetary roller carriers (4, 5) are supported in a sleeve (6) surrounding the ring gear (3) in a rotationally fixed manner relative to the sleeve (6), and wherein a friction element (7) is provided between ring gear (3) and sleeve (6), characterized in that the second planetary roller carrier (5) is operatively connected to the friction element (7) via a friction surface (8.2) in an axially extending second length region (L2).
2. Actuator according to claim 1, wherein the second planetary roller carrier (5) has an axially extending region which is at least partially surrounded by the sleeve (6) in the region of the friction surface (8.2).
3. Actuator according to claim 1 or 2, wherein the friction element (7) is a double wrap spring.
4. Actuator according to claim 1 or 2, wherein the second planetary roller carrier (5) is made of plastic.
5. Actuator according to claim 1 or 2, wherein the second planetary roller carrier (5) is provided with at least one solid lubricant.
6. Actuator according to claim 1 or 2, wherein the second planetary roller carrier (5) has at least one stop (9) for axial support in the sleeve (6).
7. Actuator according to claim 1 or 2, wherein the second planetary roller carrier (5) has bearing points (10) for positioning the planetary rollers (2) in the circumferential direction around the screw (1).
8. Actuator according to claim 1 or 2, wherein the second planetary roller carrier (5) is axially fixed on the end side with an axial fixing plate (11).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015207391.2A DE102015207391B4 (en) | 2015-04-23 | 2015-04-23 | Actuator with a planetary roller screw drive (PWG) |
| DE102015207391.2 | 2015-04-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106065927A CN106065927A (en) | 2016-11-02 |
| CN106065927B true CN106065927B (en) | 2020-08-04 |
Family
ID=57110586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610261904.9A Active CN106065927B (en) | 2015-04-23 | 2016-04-25 | Actuator with planetary roller screw drive (PWG) |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN106065927B (en) |
| DE (1) | DE102015207391B4 (en) |
| FR (1) | FR3035465B1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015205717B4 (en) * | 2015-03-30 | 2016-11-10 | Schaeffler Technologies AG & Co. KG | Actuator with a planetary roller screw drive (PWG) |
| CN109210164A (en) * | 2017-07-03 | 2019-01-15 | 上海汽车集团股份有限公司 | Planet roller screw mechanism, automobile hydraulic separation system and automobile |
| DE102018104095A1 (en) | 2017-12-12 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Planetary roller screw, actuator and release system |
| CN108799435A (en) * | 2018-07-06 | 2018-11-13 | 杭州新剑机器人技术股份有限公司 | planetary roller screw |
| DE102019103383B4 (en) * | 2019-02-12 | 2023-08-10 | Schaeffler Technologies AG & Co. KG | Planetary screw drive and actuator for a rear axle steering of a motor vehicle with such a planetary screw drive |
| DE102021119258A1 (en) | 2021-07-26 | 2023-01-26 | Schaeffler Technologies AG & Co. KG | Linear actuator with force sensors |
| CN115139921A (en) * | 2022-06-17 | 2022-10-04 | 湖南信息学院 | Multi-sensor fusion device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3003362A (en) * | 1959-02-04 | 1961-10-10 | Anderson Co | Motion-transmitting device |
| US5836208A (en) * | 1995-10-31 | 1998-11-17 | Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.V. | Apparatus for converting a rotational movement into an axial movement |
| CN101194408A (en) * | 2005-07-27 | 2008-06-04 | Ntn株式会社 | Electric direct-acting actuator and electric brake device |
| CN102165220A (en) * | 2008-10-07 | 2011-08-24 | Ntn株式会社 | Electric linear actuator and electric brake device |
| CN103133619A (en) * | 2011-12-01 | 2013-06-05 | 谢夫勒科技股份两合公司 | Planetary rolled thread drive |
| WO2015048961A2 (en) * | 2013-10-01 | 2015-04-09 | Schaeffler Technologies AG & Co. KG | Assembly with friction arrangement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3739059A1 (en) * | 1987-11-17 | 1989-05-24 | Deutsche Forsch Luft Raumfahrt | DEVICE FOR CONVERTING A ROTATIONAL MOVEMENT INTO AN AXIAL MOVEMENT |
| CN108351004A (en) * | 2015-11-13 | 2018-07-31 | 舍弗勒技术股份两合公司 | Actuator |
-
2015
- 2015-04-23 DE DE102015207391.2A patent/DE102015207391B4/en active Active
-
2016
- 2016-04-21 FR FR1653535A patent/FR3035465B1/en active Active
- 2016-04-25 CN CN201610261904.9A patent/CN106065927B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3003362A (en) * | 1959-02-04 | 1961-10-10 | Anderson Co | Motion-transmitting device |
| US5836208A (en) * | 1995-10-31 | 1998-11-17 | Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.V. | Apparatus for converting a rotational movement into an axial movement |
| CN101194408A (en) * | 2005-07-27 | 2008-06-04 | Ntn株式会社 | Electric direct-acting actuator and electric brake device |
| CN102165220A (en) * | 2008-10-07 | 2011-08-24 | Ntn株式会社 | Electric linear actuator and electric brake device |
| CN103133619A (en) * | 2011-12-01 | 2013-06-05 | 谢夫勒科技股份两合公司 | Planetary rolled thread drive |
| WO2015048961A2 (en) * | 2013-10-01 | 2015-04-09 | Schaeffler Technologies AG & Co. KG | Assembly with friction arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015207391A1 (en) | 2016-10-27 |
| FR3035465B1 (en) | 2022-06-24 |
| FR3035465A1 (en) | 2016-10-28 |
| CN106065927A (en) | 2016-11-02 |
| DE102015207391B4 (en) | 2016-11-10 |
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