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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D13/00—Friction clutches
  • F16D13/22—Friction clutches with axially-movable clutching members
  • F16D13/38—Friction clutches with axially-movable clutching members with flat clutching surfaces, e.g. discs
  • F16D13/52—Clutches with multiple lamellae ; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member
• • 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
  • F16D13/00—Friction clutches
  • F16D13/58—Details
  • F16D13/60—Clutching elements
  • F16D13/64—Clutch-plates; Clutch-lamellae
  • F16D13/68—Attachments of plates or lamellae to their supports
  • F16D13/683—Attachments of plates or lamellae to their supports for clutches with multiple lamellae
• • 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
  • F16D13/00—Friction clutches
  • F16D13/58—Details
  • F16D13/72—Features relating to cooling
• • 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
  • F16D2300/00—Special features for couplings or clutches
  • F16D2300/02—Overheat protection, i.e. means for protection against overheating
  • F16D2300/021—Cooling features not provided for in group F16D13/72 or F16D25/123, e.g. heat transfer details
  • F16D2300/0214—Oil or fluid cooling
• • 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
  • F16D2300/00—Special features for couplings or clutches
  • F16D2300/06—Lubrication details not provided for in group F16D13/74

Definitions

• the invention relates to a coolant delivery device for a wet friction clutch, which is particularly suitable for use as a starting clutch in small vehicles.
• the present invention has the object, at least partially overcome the known from the prior art disadvantages.
• the object is solved by the features of the independent claims.
• Advantageous developments are the subject of the dependent claims.
• the invention relates to a coolant delivery device for a wet friction clutch, comprising at least one disc with at least one guide structure for conveying coolant in the axial direction and / or radial direction.
• the cooling liquid conveying device accomplishes a promotion of the cooling liquid in a wet space of a wet friction clutch, whereby the pump pressure to be applied for conveying the cooling liquid can be reduced.
• a cooling liquid is usually a mineral oil, silicone oil or another, in particular synthetic, liquid which does not have a corrosive effect on the materials used and has a suitable heat capacity and viscosity. By reducing the pressure, the internal friction in the coolant is also reduced, so that the coolant with a higher usable heat capacity can be introduced into the wet space.
• the coolant delivery device comprises a disc, which is preferably rotationally symmetrical. In particular, the disc limits a portion of the wet space volume in the wet friction clutch.
• the disk does not have to be flat, but can have projections and recesses, for example in the manner of a shaped sheet metal part.
• the disk comprises a guide structure which at least supports the conveying of a cooling liquid in the wet space of a friction clutch.
• the conveying direction can be in the axial direction, that is perpendicular to the disc, or in the radial direction Direction, that is along a radius of the disc supported.
• the cooling liquid does not have to follow exactly these directions, but only be conveyed over a period of time in said direction or have a motion vector component in this direction.
• the lead structures can be formed, inter alia, by a rough surface or by exposed pins or rivets on a surface of the disc.
• a rough surface can be achieved, for example, by a raw casting surface.
• a mold is designed explicitly rough, so that a significantly rougher surface is formed than is desirable for conventional applications.
• the roughness of the surface is adapted to the viscosity of the coolant used. The roughness should be as large as possible to ensure a maximum entrainment effect, that is, no limits are set to the top or extreme roughness is then again synonymous with blade effect or blade structures.
• the cooling liquid conveying device is passively operable; that is, at a relative speed between the cooling liquid and the cooling liquid conveying device, the cooling liquid is conveyed through the guide structure in the axial and / or radial direction.
• the cooling liquid conveying device can stand and rotate the cooling liquid in a ring, because it is carried along by the friction with one of the plate carrier.
• the cooling liquid encounters the guide structure at a relative speed and is deflected by the latter in one of the directions.
• At least one opening and at least one blade element are provided on at least one of the openings, wherein cooling liquid is conveyed by means of the at least one blade element in the axial direction and / or radial direction through the corresponding opening.
• the openings are arranged such that they are passable for the cooling liquid used.
• the size of the opening is set up such that the desired amount of sales of cooling liquid with the least possible resistance can pass through the at least one opening.
• a plurality of openings is provided on the surface of the disc.
• the disc forms a flange on the outer circumference, in which at least one opening, preferably a plurality of openings, is introduced.
• a blade element is provided at the at least one opening. For example circulating cooling liquid on such a blade element, the cooling liquid is conveyed by the relative movement between the blade element and the cooling liquid through the corresponding opening.
• the blades may be formed radially or tangentially, so that they convey in an existing direction of circulation of the cooling liquid these in the axial direction and / or in the radial direction through the opening.
• a coolant delivery device thus also has a passive pumping action.
• the guide structure is formed at least partially from a plurality of radially extending elevations in the cooling liquid conveying device.
• the radially extending elevations may be arranged in the form of webs or ribs on the disk.
• the elevations do not have to extend strictly radially; for example, they may also be curved or wavy from a central axis of the disk to the outer periphery of the disk.
• the guide structure thus preferably has a radial component. As a result, the cooling liquid is conveyed radially outward.
• the formation of such conductive structures is particularly easy to manufacture, for example, by prototyping or sheet metal forming a disc.
• the cooling liquid conveying device is rotatable and, during a rotation, stationary or slower rotating cooling liquid can be conveyed by means of the guide structure in the axial direction and / or radial direction.
• the cooling liquid delivery device preferably rotates about the axial direction. Cooling liquid having a relative velocity with respect to the cooling liquid conveying device, in particular with a rotational relative speed, is conveyed by the cooling liquid conveying device in the axial or radial direction.
• the cooling liquid conveying device is used as an active pump which assists, deflects or even carries out the conveying of the cooling liquid alone.
• the guide structure and / or the blade elements are aligned such that it is not directed against the circulation of the cooling liquid.
• a wet friction clutch is also described for releasably connecting a drive unit to a drive train, which has at least the following components:
• At least one lamella basket for receiving a disk pack in the wet space for releasably frictionally connecting an input shaft to an output shaft; wherein at least one cooling liquid conveying device is provided according to the above description, which is connected either to the input shaft or to the output shaft.
• the wet friction clutch is adapted to transmit a torque, the main transmission direction being directed from a drive unit to a drive train.
• a transmission of the torque from the drive train of the motor vehicle to the drive unit of the motor vehicle is possible.
• the friction clutch is thereby switchable during the application of a torque or a speed, so that, for example, in a subsequent manual transmission, the translation can be changed.
• the wet friction clutch is a starting clutch that transmits a speed and a torque to a connected stationary propulsion, for example the wheels of a motor vehicle.
• the wet friction clutch is smaller compared to a conventional dry friction clutch, because lower heat masses are needed to dissipate the heat generated by the friction; because the heat can be dissipated via a cooling liquid.
• the drive unit may be an internal combustion engine, an electric motor or the like.
• the drive train is often composed of a manual transmission and a shaft system for transmitting the torque of the drive unit to, for example, wheels of a motor vehicle.
• the wet friction clutch has a wet space, which can be filled with coolant.
• the cooling liquid is conveyed constantly or as required through the wet space, so that heat generated in the wet room can be dissipated.
• At least one lamellae basket is arranged, in which by means of a disk pack, an input shaft can be frictionally connected to an output shaft.
• the disk pack consists of a plurality of disks.
• the input shaft is in this case so called because it usually transmits a torque in the wet friction clutch and the output shaft is so designated because it usually transmits a torque from the wet friction clutch to connected components.
• this transmission direction can also be reversed, for example, in towing a drive unit.
• a coolant delivery device according to the above description is provided here.
• this coolant delivery device is connected either to the input shaft or to the output shaft.
• cooling liquid delivery device on the output shaft in order to passively use the cooling liquid delivery device, that is to say by slower movement of the cooling liquid delivery device than the circulation of the cooling liquid or, secondly, the cooling liquid delivery device only to be activated and after to deactivate the release.
• the cooling liquid delivery device In a pressed state, there is virtually no rotational relative movement, because the cooling liquid is rotated by the adjacent rotating parts. This means that the capacity of the friction clutch is precisely adapted to the conditions and then the promotion is supported when most of the heat has to be dissipated.
• the at least one coolant delivery device is formed by at least one lamellar basket.
• a lamella basket is often composed of a disk element and a receptacle for a disk pack.
• the cooling liquid delivery device according to the above description can be integrated on the disc element.
• the wet friction clutch further comprises a centrifugal oil hood and at least onedestattkeits junkein- direction is formed by the centrifugal oil hood.
• a centrifugal oil hood can be provided which prevents radially accelerated cooling fluid, at least for the most part, from reaching the centrifugal force beyond the centrifugal oil hood.
• a Fliehölhaube is usually disc-shaped and has a flange on the outer circumference.
• the Fliehölhaube can be attached to fixed or rotating components.
• the centrifugal oil hood can be used in particular for deflecting the inflowing cooling liquid in the axial direction and / or in the radial direction.
• coolant is conveyed by means of the cooling fluid conveying device via a disk pack arranged radially or externally to the coolant fluid conveying device.
• the main part of the heat is created in the disk pack. Due to the high shear forces, which are introduced here on the cooling liquid due to the relative movement between the friction surfaces of the slats, the cooling liquid is often transported around the disk pack around, so that the already warmed up coolant remains in the disk pack and the still cold cooling liquid passes unused to the disk pack , By a targeted guide structure, or opening and blade element, the promotion of the cooling liquid can be forced into the disk set. For this purpose, not the total pressure in the wet room must be raised, but only a local pressure increase, or even pressure reduction, be generated in the region of the disk pack. By means of this measure, the heat output can be better dissipated.
• cooling liquid can be supplied at a lower pressure by a pump arranged outside the friction clutch, so less Heat is produced when conveying the cooling liquid and thus an improved heat dissipation can take place.
• the wet friction clutch is a double clutch.
• a dual clutch is usually used with a double shift transmission, wherein an input shaft with two transmission shafts via two corresponding output shafts is connectable. Accordingly, such a double clutch on two disk packs, which can be arranged differently from each other.
• the disk packs can be arranged axially one behind the other.
• a central coolant delivery device for both disc packs is particularly useful.
• Such a coolant delivery device can be formed, for example, via the central web, which is rotationally fixed, for example, to the input shaft and forms a pressure plate for the two disk packs.
• double clutches are known in which the disk packs are arranged radially to each other.
• a cooling liquid conveying device can be formed.
• at least one coolant delivery device is connected to one of the output shafts, so that a coolant delivery device is activated accordingly only when the corresponding output shaft is in the switched state with the input shaft always rotating and promotes coolant for this disc assembly.
• the other disk pack is, for example, only passively cooled.
• a motor vehicle which has a drive unit with an output shaft, a drive train and a wet friction clutch according to the above description for releasably connecting the output shaft to the drive train, wherein the drive unit in the motor vehicle in front of a driver's cab and across a longitudinal axis of the motor vehicle is arranged.
• the drive unit for example an internal combustion engine or an electric motor
• the space is particularly low especially with such an arrangement and it is therefore particularly advantageous to use a small size coupling.
• the installation space situation for passenger cars of the small car class according to European classification is exacerbated.
• the units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller.
• the friction clutch described above has a small size and it can be used a less powerful pump, which in turn has a smaller space requirement.
• Passenger cars are classified according to vehicle class according to, for example, size, price, weight, power, but this definition is subject to constant change according to the needs of the market.
• vehicles of the class small cars and microcars are classified according to European classification of the class of subcompact car and in the British market they correspond to the class Supermini, for example, the class City Car.
• micro car class are a Volkswagen Fox or a Renault Twingo.
• Examples of the small car class are an Alfa Romeo Mito, Volkswagen Polo, Ford Fiesta or Renault Clio.
• FIGS. show particularly preferred embodiments, to which the invention is not limited.
• the figures and in particular the illustrated proportions are only schematic. Show it:
• FIG. 1 shows schematically a wet friction clutch with a cooling liquid conveying device
• FIG. 2 a coolant delivery device for conveying in the radial direction
• FIG. 3 shows a lamella basket with integrated coolant delivery device
• FIG. 4 shows a detail of a lamella basket with coolant delivery device
• FIG. 5 shows a guide structure for conveying in the axial direction
• FIG. 6 shows a motor vehicle with a wet friction clutch.
• a schematic of a wet friction clutch 2 is shown with a wet room 14, in which a lamellae basket 15 is arranged for receiving a disk pack 16 about a central axis 24.
• the cooling liquid conveying device 1 is in this case formed integrally by the centrifugal oil hood 19 and has a guide structure 4, which ensures that the cooling liquid 7 is conducted in accordance with the illustrated arrow through the lamella basket 15 or the disk pack 16.
• the guide structure 4 is in this case arranged on a disc 3 of the cooling liquid conveying device 1.
• the orientation of the axial direction 8 and the radial direction 9 is indicated.
• the cooling liquid 7 is conveyed mainly in the radial direction 9 to the fin basket 15 out.
• a cooling liquid conveying device 1 is shown in plan view, which is constructed from a rotationally symmetrical disc 3 and elevations 1 1, which form a guide structure 4 to promote cooling liquid 7 in the radial direction 9 away from the central axis 24.
• a fin basket 15 which integrally forms the cooling liquid conveying device 1, which can rotate about the central axis 24.
• the lamella basket 15 comprises a disk 3 on which first blade elements 5, each having associated openings 10, are formed in this example.
• FIG. 4 shows a section basket 15 in section, which forms the cooling liquid conveying device 1.
• two disks 3 are provided which have a first blade element 5 and a second blade element 6 at the opening 10, whereby the cooling liquid 7 is actively or passively conveyed in the axial direction 8 during a relative rotation between the cooling liquid conveying device 1 and the lamella basket 15.
• FIG. 5 shows a blade element 6 which conveys circulating coolant 7 through the opening 10 in the radial direction 9.
• a motor vehicle 20 is shown schematically, which has a drive unit 12, the output shaft 21 via a wet friction clutch 2 with a drive train thirteenth is connected, the latter being shown only schematically.
• the drive unit 12 is arranged in the motor vehicle 20 in front of the driver's cab 22.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mechanical Operated Clutches (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49080629

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (8)

Family Cites Families (1)

• 2013
  • 2013-07-30 WO PCT/DE2013/200079 patent/WO2014019581A1/fr not_active Ceased
  • 2013-07-30 EP EP13753558.9A patent/EP2880327A1/fr not_active Withdrawn
  • 2013-07-30 DE DE201311003783 patent/DE112013003783A5/de not_active Withdrawn
  • 2013-07-30 DE DE102013214820.8A patent/DE102013214820A1/de not_active Withdrawn

Patent Citations (8)

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