EP3755931A1 - Linearaktuator für ein ventil eines kraftfahrzeugs - Google Patents
Linearaktuator für ein ventil eines kraftfahrzeugsInfo
- Publication number
- EP3755931A1 EP3755931A1 EP19701630.6A EP19701630A EP3755931A1 EP 3755931 A1 EP3755931 A1 EP 3755931A1 EP 19701630 A EP19701630 A EP 19701630A EP 3755931 A1 EP3755931 A1 EP 3755931A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- spindle
- gear
- linear actuator
- motor vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000008878 coupling Effects 0.000 claims abstract description 75
- 238000010168 coupling process Methods 0.000 claims abstract description 75
- 238000005859 coupling reaction Methods 0.000 claims abstract description 75
- 230000005540 biological transmission Effects 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
-
- 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
- F16H25/2018—Screw mechanisms with both screw and nut being driven, i.e. screw and nut are both rotating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
- F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
-
- 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
- F16H2025/204—Axial sliding means, i.e. for rotary support and axial guiding of nut or screw shaft
-
- 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
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2081—Parallel arrangement of drive motor to screw axis
-
- 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
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2087—Arrangements for driving the actuator using planetary gears
Definitions
- the invention relates to a linear actuator for a valve of a motor vehicle, comprising an electric motor, a planetary gear with a ring gear, a sun gear, and at least one planetary gear, a spindle drive with a spindle rod with an external thread, which is arranged coaxially with the ring gear and the sun gear, and a spindle nut with an internal thread, which meshes with the external thread of the spindle rod.
- Such linear actuators are used, for example, in exhaust gas recirculation valves of motor vehicles in order to lift a valve body from a valve seat. As a result, a defined amount of exhaust gas can be added to the fresh air supplied to the internal combustion engine in order to reduce the pollutant emissions.
- a large force may be necessary to open the valve, so that between the electric motor and the driven spindle nut usually a transmission is arranged, which underpins the rotation of the drive shaft for driving the spindle nut. As a result, a larger lifting force can be generated.
- a transmission for example, a planetary gear can be used.
- the planetary gear has a rotatable ring gear, a fixed sun gear and a revolving planet gear.
- the ring gear is driven by the electric motor and the planet gear is coupled to the spindle nut of the spindle drive such that rotation of the spindle nut is generated at the peripheral speed of the planetary gear.
- the planetary gear has a high gear ratio between the rotational speed of the ring gear and the rotational speed of the planetary gear to produce a high torque on the spindle nut.
- the rotationally fixed valve rod is formed in sections as a spindle, which meshes with the rotating spindle nut. As a result, the rotation of the spindle nut is converted into an axial movement of the valve stem.
- the planetary gear has a planetary gear driven by the electric motor with a stationary axis of rotation, the spindle nut rotatably connected to the sun gear, and the spindle rod has an axial bearing portion, via which the spindle rod is mounted axially displaceable and rotationally fixed to the ring gear in a coupling unit , is generated by the electric motor by means of the planetary gear simultaneously both a rotation of the spindle nut, as well as a rotation of the spindle rod with opposite direction of rotation.
- the linear actuator according to the invention thus enables a high actuating speed when using a transmission with a high transmission ratio. This allows a short positioning time of the linear actuator at the same time high power and low energy consumption of the electric motor.
- the spindle rod is guided in the circumferential direction positively and thus rotationally fixed in the coupling unit.
- This allows a simple and reliable rotationally fixed coupling of the spindle rod with the ring gear, which at the same time allows an axially displaceable mounting of the locking bar.
- the coupling unit has a recess, via which the coupling unit is connected in the circumferential direction positively with the bearing portion of the spindle rod.
- the recess has a substantially radially outwardly extending groove into which a torque-transmitting member protrudes, the inner radial end is non-rotatably mounted on the spindle rod.
- the torque transmission member may for example be a spring which projects with a radially inner side into a groove provided on the spindle rod. This allows a simple and reliable rotationally fixed coupling of the spindle rod with the ring gear.
- the form-fitting is formed in the circumferential direction by the torque-transmitting member and the groove, so that no special spindle rod cross-section is required for the rotationally fixed coupling of the spindle rod with the ring gear.
- the coupling unit has a coupling receptacle in which a coupling is arranged with two coupling elements, wherein a first coupling element is rotatably connected to the coupling unit, a second coupling element rotatably connected to the Spindestandange, and the coupling elements a positive connection Form in the circumferential direction. Since the positive connection is formed by the coupling, the cross sections of the coupling unit and the spindle rod need not be formed correspondingly. This allows, for example, the use of a universal coupling unit for various Spindle rod-guides.
- the coupling may for example have a simple tongue and groove connection, which forms a stable positive connection.
- the coupling unit has a plurality of spokes, preferably three spokes, via which the coupling unit is non-rotatably connected to the ring gear, wherein the spokes have a substantially radially extending first leg and a subsequent to the first leg and substantially axially extending second leg respectively.
- the coupling unit is positioned both axially and radially reliable with respect to the ring gear.
- the axial offset between the ring gear and the coupling unit is defined over the length of the axial legs.
- the axial bearing portion of the spindle rod has a quadrangular cross-section, whereby a reliable positive engagement in the circumferential direction is made possible with simple production.
- the spindle nut is formed integrally with the sun gear.
- the planetary gear has a total of three planet gears, which are preferably arranged distributed uniformly along the circumference of the ring gear. This allows a precise and stable radial positioning of the gear wheels to each other. By the plurality of planetary gears, the load of the individual gears of the transmission is reduced, thus improving the life of the transmission.
- the planetary gear has a reduction ratio with a gear ratio of the driven planetary gear to the sun gear in a range of eight to ten. This allows a high positioning speed of the linear actuator at the same time sufficiently high translational force.
- a thrust bearing is arranged at one axial end of the spindle rod, which connects the spindle rod with a rotationally fixed and axially displaceable Ventifstange.
- the rotational and translational movement of the spindle rod can be converted into a purely translatory movement of the valve rod.
- the electric motor has a drive shaft, which is arranged parallel to the spindle rod and to which the driven planet gear is mounted rotationally fixed. This allows a particularly compact and simple construction of the linear actuator,
- FIG. 1 shows a perspective view of a linear actuator according to the invention for a valve of a motor vehicle
- FIG. 2 shows a schematic side view of the linear actuator from FIG. 1, the spindle rod being coupled to a valve rod via a thrust bearing,
- FIG. 3 shows a schematic illustration of a planetary gear of the linear actuator of FIG. 1,
- Figure 4 shows a schematic representation of an alternative coupling unit of the linear actuator of Figure 1, wherein the coupling unit has a recess with a groove into which a rotatably connected to the spindle rod torque transmission member protrudes, and
- FIG 5 shows a schematic representation of another alternative coupling unit of the linear actuator of Figure 1, wherein in a central recess of the coupling unit, a clutch is arranged.
- the linear actuator comprises an electric motor 10, a planetary gear 12 and a spindle drive 14.
- the electric motor 10 has a drive shaft 16 which is driven by the electric motor 10, so that the drive shaft 16 rotates about a drive shaft rotation axis 18.
- the planetary gear 12 includes a ring gear 20, a sun gear 22 and three planet gears 24a-c.
- the Hohirad 20 and the sun gear 22 are rotatably disposed about a common transmission rotational axis 26, wherein the ring gear 20 radially surrounds the sun gear 22.
- the transmission rotational axis 26 extends parallel to the drive shaft rotational axis 18.
- the ring gear 20 has on the radial inner side a ring gear 28 on.
- the sun gear 22 has on the radial outer side of a sun gear 30 and has a central Spindelstangen shed evaluation 31.
- the three planet gears 24a-c are disposed radially between the sun gear 22 and the ring gear 20, with the planet gears 24a-c being distributed uniformly along the circumference of the sun gear 22.
- the planet gears 24a-c are each rotatably disposed about a fixed planetary rotation axis 32a-c which is parallel to the drive shaft rotation axis 18 and the transmission rotation axis 26.
- the planetary gears 24a-c have on the radially outer side each a Planetenradverzahnung 34 which both with the Hohlradverzahnung 28 as well as with the
- Sun gear 30 is engaged.
- the planetary gear 24 a is rotatably mounted on the drive shaft 16, so that the Planetenradwindachse 32 a of the drive shaft rotation axis 18 corresponds.
- the spindle drive 14 comprises a spindle rod 36 and a spindle nut 38.
- the spindle nut 38 is integrally formed with the sun gear 22 and has a central spindle nut bore 40 with an internal thread 42 which extends along the transmission rotational axis 26.
- the spindle rod 36 extends along the transmission rotational axis 26 through the Spindle passage 31 of the sun gear 22 therethrough.
- the spindle rod 36 has a threaded portion 44 and a bearing portion 48 in the axial direction.
- the threaded portion 44 is provided with a circular cross section and an external thread 46.
- the bearing portion 48 has a quadrangular cross section.
- the spindle rod 36 is arranged with the threaded portion 44 in the spindle nut 38, so that the external thread 46 of the spindle rod 36 meshes with the internal thread 42 of the spindle nut 38.
- the spindle rod 36 is mounted on the bearing portion 48 axially displaceable in a coupling unit 50.
- the coupling unit 50 has a central recess 52 with a quadrangular cross-section, which forms a forming foot 54 in the circumferential direction with the bearing portion 48 of the spindle rod 36.
- the coupling unit 50 has three spokes 56, via which the coupling unit 50 is connected in a rotationally fixed manner to the ring gear 20.
- the spokes 56 each have a first radially extending first leg 58 and a substantially axially extending second leg 60 so that the coupling unit 50 axially spaced and radially centered to the sun gear 22 is positioned.
- the planet gear 24a is driven by the electric motor 10, for example, as shown in FIG. 3, at a rotational speed U1 in a clockwise direction.
- a rotation of the ring gear 20 in a clockwise direction with a rotational speed U 2 and a rotation of the sun gear in the counterclockwise direction with a rotational speed U 3 are thereby produced.
- the spindle rod 36 is rotatably connected with the coupling unit 50 above the form-locking connection 54, and thus connected in a rotationally fixed manner to the ring gear 20. This results in operation in a rotation of the planetary gear 24a in a clockwise direction, a rotation of the spindle rod 36 in the clockwise direction with a rotational speed U2.
- the spindle nut 38 is integrally formed with the sun gear 22, so that the spindle nut 38 rotates counterclockwise at a rotational speed U3.
- the intermeshing threads 42,46 of the spindle rod 36 and the spindle nut 38 this results in an axial movement of the spindle rod 36 with respect to the axially fixed spindle nut 38.
- the spindle rod 36 can thus by driving the planet gear 24a via the electric motor 10 axially along the transmission axis of rotation 26 are moved.
- By driving the planetary gear 24a in a clockwise or counterclockwise direction a movement of the spindle rod 36 can be generated in both axial directions.
- a thrust bearing 64 may be arranged, which the spindle rod 36 with a rotationally fixed and axially displaceable Valve rod 66 connects. In this way, the rotational and translational movement of the spindle rod 36 can be converted into a purely translational movement of the valve rod 66.
- FIG. 4 shows an alternative coupling unit 50 'with a central recess 52', which has a first groove 68 extending substantially radially outwards.
- the spindle rod 36 'on the radial outer side has a substantially radially inward direction extending second groove 69, which faces the first groove 68.
- a spring 70 is arranged, which forms a positive fit 54 'with the grooves 68,69, so that the spindle rod 36' rotatably connected to the coupling unit 50 'is connected,
- FIG. 5 shows a further alternative coupling unit 50 ".
- the coupling unit 50" has a central coupling receptacle 74 with a circular cross section.
- a coupling 76 with a coupling ring 78 and a clutch spring 80 is arranged in the coupling receptacle 74.
- the coupling ring 78 is non-rotatably connected on the radial outer side to the coupling unit 50 "and has on the radially inner side a substantially radially outwardly extending coupling groove 82.
- the coupling spring 80 protrudes with the radially outer side into the coupling groove 82 of the coupling ring 78 and protrudes with the radially inner side into the groove 69 of the spindle rod 36 '.
- the clutch spring 80 forms in the circumferential direction a positive connection 54 "with the coupling groove 82 and with the groove 69, via which the spindle rod 36' rotatably connected to the ring gear 20 is. Due to the reduction of the driven planetary gear both to the ring gear and to the sun gear on the spindle rod and the spindle nut simultaneously high torques and thus a high translational force can be generated without the need for a particularly powerful electric motor is required.
- Coupler pocket 76 Coupling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Mechanically-Actuated Valves (AREA)
- Retarders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018103619.1A DE102018103619B3 (de) | 2018-02-19 | 2018-02-19 | Linearaktuator für ein Ventil eines Kraftfahrzeugs |
| PCT/EP2019/051638 WO2019158331A1 (de) | 2018-02-19 | 2019-01-23 | Linearaktuator für ein ventil eines kraftfahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3755931A1 true EP3755931A1 (de) | 2020-12-30 |
Family
ID=64952054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19701630.6A Withdrawn EP3755931A1 (de) | 2018-02-19 | 2019-01-23 | Linearaktuator für ein ventil eines kraftfahrzeugs |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3755931A1 (de) |
| DE (1) | DE102018103619B3 (de) |
| WO (1) | WO2019158331A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1245926A (en) * | 1967-09-29 | 1971-09-15 | Plessey Co Ltd | Improvements in or relating to low-speed linear actuators |
| CA1039985A (en) * | 1974-11-12 | 1978-10-10 | Ingersoll-Rand Company | Controlled torque air motor |
| DE4133962A1 (de) * | 1991-10-14 | 1993-04-15 | Fichtel & Sachs Ag | Verstellantrieb |
| DE10044898A1 (de) | 2000-09-12 | 2002-04-25 | Berger Lahr Gmbh & Co Kg | Ventil |
-
2018
- 2018-02-19 DE DE102018103619.1A patent/DE102018103619B3/de not_active Expired - Fee Related
-
2019
- 2019-01-23 EP EP19701630.6A patent/EP3755931A1/de not_active Withdrawn
- 2019-01-23 WO PCT/EP2019/051638 patent/WO2019158331A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019158331A1 (de) | 2019-08-22 |
| DE102018103619B3 (de) | 2019-01-24 |
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