WO1986002132A1 - Embrayage visqueux, avec reglage du remplissage - Google Patents

Embrayage visqueux, avec reglage du remplissage Download PDF

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Publication number
WO1986002132A1
WO1986002132A1 PCT/EP1985/000508 EP8500508W WO8602132A1 WO 1986002132 A1 WO1986002132 A1 WO 1986002132A1 EP 8500508 W EP8500508 W EP 8500508W WO 8602132 A1 WO8602132 A1 WO 8602132A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
closing member
viscous coupling
intermediate wall
cantilever
Prior art date
Application number
PCT/EP1985/000508
Other languages
German (de)
English (en)
Inventor
Ünal GAZYAKAN
Friedrich Ehrlinger
Original Assignee
Zahnradfabrik Friedrichshafen Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zahnradfabrik Friedrichshafen Ag filed Critical Zahnradfabrik Friedrichshafen Ag
Publication of WO1986002132A1 publication Critical patent/WO1986002132A1/fr

Links

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
    • F16D35/00—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
    • F16D35/02—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part
    • F16D35/021—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves
    • F16D35/022—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves the valve being actuated by a bimetallic strip
    • 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
    • F16D35/00—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
    • F16D35/005—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with multiple lamellae

Definitions

  • the invention relates to a viscous coupling according to the preamble of the main claim.
  • a viscous clutch according to DE-PS 21 35 791 has a torque that increases with increasing relative speed.
  • a small viscous clutch of this type still allows almost free speed compensation when cornering on a rough road.
  • a large such viscous coupling generates a large locking torque when a wheel wants to spin due to insufficient frictional contact with the ground and thus secures the wheel or - in the case of more than two driven wheels - the wheels on grippy ground even in extreme cases the necessary drive torque.
  • a conventional medium-sized viscous coupling of this kind hinders the speed compensation when cornering and generates only a limited locking torque. This results in increased tire wear and increased steering forces, lost power and increased fuel consumption when cornering on a grippy road.
  • the drive torque on the still gripping wheel or - in the case of more than two driven wheels - on the still gripping wheels in extreme driving conditions is no longer sufficient to secure the drive of the vehicle.
  • the invention has for its object to provide a viscous coupling according to the preamble of the main claim, which both allows an almost free speed compensation when cornering on a grippy roadway and also generates a very large locking torque when a wheel wants to spin due to poor frictional contact with the ground .
  • This task is accomplished with the characterizing features of the main claim. While at low relative speeds, such as occur when cornering on a non-slip road, the working chamber of the viscous coupling contains only a small amount of liquid and therefore only a small locking torque is created, which hardly impedes the speed compensation, the pump effects at higher relative speeds, such as when spinning of a wheel arise that the working chamber is filled to overflow and the viscous coupling thus generates a very large locking torque.
  • Claim 2 specifies a particularly simple design of a pump.
  • a pump of this type is known per se (DE-PS 12 84 186, DE-PS 30 09 665), but not in connection with a viscose coupling according to the main claim.
  • Claim 3 adds the advantage that the amount of liquid in the working chamber and thus the torque of the viscous clutch are even more reliably low below a predetermined relative speed and very large above this relative speed.
  • Claim 4 adds features with which the relative speed shut-off valve according to claim 3 can be designed to save space with particularly simple components.
  • Claim 5 adds features with which overheating and thus damage to the viscous coupling is prevented.
  • Thermal shut-off valves for regulating the amount of liquid in a working Chamber and thus for regulating the torque of a viscous coupling are known per se (DE-PS 12 84 186), but not in connection with a viscous coupling according to the main claim.
  • Claim 6 adds features with which the thermal shut-off valve can be represented with only a few, simple, additional components.
  • Claim 7 adds a feature with which the bimetal cantilever is protected particularly reliably against permanent deformation.
  • Claim 8 has the advantage that an additional cantilever spring is omitted.
  • Claim 9 has the advantage that the function of the thermal shut-off valve is not influenced by liquid friction forces occurring at relative speed.
  • Claim 10 has the advantage that the function of the thermal shut-off valve is not disturbed by the pressure drop between the two chambers.
  • Fig. 1 shows a cross section
  • Fig. 2 shows a longitudinal section
  • Fig. 3 shows a longitudinal section.
  • a first assembly 1 and a second assembly 2 form a housing 1, 2 partially filled with a liquid.
  • An intermediate wall 3 is firmly connected to the first assembly 1 and divides the housing 1, 2 into a working chamber 4 and a storage chamber 5.
  • a pump rotor 6 is arranged in the storage chamber 5 and firmly connected to the second assembly 2. Close to her Ren edge carries the partition 3 bluff body 7, which protrude axially into the storage chamber 5. In the circumferential direction on both sides of the bluff body 7, the intermediate wall 3 has discharge openings 8. At a relative speed between the assembly 1 and the assembly 2, the pump rotor 6, the bluff bodies 7 and the discharge openings 8 act together as pumps 6, 7, 8 and convey liquid from the storage chamber 5 into the working chamber 4.
  • the inner wall of the intermediate wall 3 With the inner wall of the intermediate wall 3 carries a bearing ring 9 and on this bearing ring 9 a bearing washer 10, a corrugated ring spring 11 and a washer 12.
  • the corrugated ring spring 11 presses the washer 12 axially against the intermediate wall 3.
  • the washer 12 is to the intermediate wall 3 rotatable, delimited by a rivet pin 13 on the intermediate wall 3 in a window 14 of the disk 12.
  • a cover disk 22 is firmly connected to the disk 12 via support rivets 21.
  • a drag plate 23 is rotatably connected to the second assembly 2.
  • liquid generates a drag torque on the cover disk 22 in a narrow gap 24 between the drag disk 23 and the cover disk 22 and on the disk 12 via the support rivets 21 increasing relative speed greater than a holding torque by a biasing force of the return spring 15, the disc 12 rotates relative to the intermediate wall 3 into a second position, in which webs 37 between the slots 19 of the intermediate wall 3 Slots 20 of the 'disc 12 and webs 25 of the disk 12 of the partition wall 3 close between the slots 20, the slots 19 with flat sealing surfaces 26, a through the partition 3 and the disc 12 formed relative speed cutoff valve 3, 12 is thus closed and fluid only still flows back through an overflow opening 27 radially inside the bearing ring 9 from the working chamber 4 into the storage chamber 5.
  • cantilever springs 29 and bimetallic cantilever bars 30 are fastened to the disk 12 with rivets.
  • the cantilever springs 29 form with their free end 31 closing members 31 which, with a slight pretension of the cantilever springs 29, close second openings 32 in the disk 12 in a first position.
  • the free end 31 of the cantilever spring 29 carries a hook-shaped extension 33.
  • the free end 34 of the bimetallic cantilever rods 30 protrude into a space 35 between the extension 33 and the free end 31 of the cantilever spring 29.
  • the bimetallic cantilever 30 bends as a thermal expansion element 30, its free end 34 grips the extension 33, thus lifts the free end 31 of the cantilever spring 29 as a closing element 31 from the opening 32 in the disk 12 and forms the second Breakthroughs 32 in the Disc 12 together with second openings 36 in the intermediate wall 3 open return lines 32, 36 through which liquid flows back from the working chamber 4 into the storage chamber 5.
  • the bimetallic cantilever rod 30 extends again, its free end 34 releases the extension 33 again, the free end 31 of the cantilever spring 29 closes the opening 32 and thus the second return line 32, 36, the amount of liquid in the working chamber 4 and thus the torque of the viscous clutch rise again.
  • the free end 31 of the cantilever spring 29 and the disk 12 thus form a thermal shut-off valve 12, 31.
  • the amount of liquid increases only when both the relative speed blocking valve 3, 12 and the thermal blocking valve 12, 31 are closed, and only when a predetermined relative speed is exceeded and a predetermined temperature is undershot the working chamber 4 to overflow through the overflow opening 27, the viscous coupling generates a large locking torque. If even one of the two valves 3, 12 or 12, 31 is open, the amount of liquid in the working chamber 4 and thus the torque of the viscous coupling remains low.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

Un embrayage visqueux destiné à être utilisé comme embrayage d'enclenchement dans un système d'engrenages à différentiel pour véhicules, avec une chambre de travail (4) et une chambre de stockage (5). Une pompe (6, 7, 8) envoie du liquide de la chambre de stockage (5) vers la chambre de travail (4). En cas de dépassement d'une vitesse de rotation préréglée, une première valve (3, 12) ferme une première ligne de retour (19, 20); en cas de dépassement d'une température préréglée, une deuxième valve (12, 31) ouvre une deuxième ligne de retour (32, 36) de la chambre de travail (4) à la chambre de stockage (5). Le couple et la perte calorifique de l'embrayage visqueux sont faibles aux petites vitesses relatives de rotation et/ou à des températures élevées. Le couple est important seulement lorsque les valeurs dépassent simultanément une vitesse relative de rotation préréglée et tombent au-dessous d'une température préréglée.
PCT/EP1985/000508 1984-10-04 1985-10-01 Embrayage visqueux, avec reglage du remplissage WO1986002132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LUPCT/EP84/00303 1984-10-04
EP8400303 1984-10-04

Publications (1)

Publication Number Publication Date
WO1986002132A1 true WO1986002132A1 (fr) 1986-04-10

Family

ID=8164976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000508 WO1986002132A1 (fr) 1984-10-04 1985-10-01 Embrayage visqueux, avec reglage du remplissage

Country Status (3)

Country Link
EP (1) EP0229063A1 (fr)
DE (1) DE3534999A1 (fr)
WO (1) WO1986002132A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207492A (en) * 1987-07-29 1989-02-01 Viscodrive Gmbh Viscous shear coupling
EP0315444A1 (fr) * 1987-11-05 1989-05-10 LUCAS INDUSTRIES public limited company Freins à disque pour véhicules du type à refroidissement par liquide
GB2210144A (en) * 1987-09-22 1989-06-01 Usui Kokusai Sangyo Kk Viscous shear fan coupling
GB2190984B (en) * 1986-05-27 1990-07-25 Household Mfg Inc Fluid shear coupling apparatus
GB2229256A (en) * 1989-03-13 1990-09-19 Viscodrive Gmbh Fluid friction coupling with closing slide

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3611093A1 (de) * 1986-04-03 1987-10-08 Opel Adam Ag Kraftfahrzeug mit allradantrieb
US6725813B1 (en) * 2003-03-03 2004-04-27 Borgwarner, Inc. Temperature-controlled variable speed water pump

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245655B (de) * 1961-05-18 1967-07-27 Eaton Yale & Towne Fluessigkeitsreibungskupplung mit insbesondere temperaturabhaengig gesteuerter Fuellung
GB1128597A (en) * 1966-02-14 1968-09-25 Eaton Yale & Towne Fluid coupling
DE1425251A1 (de) * 1962-09-17 1968-11-28 Eaton Yale & Towne Kraftuebertragungskupplung
DE1284186B (de) * 1961-06-07 1968-11-28 Wallace Murray Corp Fluessigkeitsreibungskupplung
FR1551318A (fr) * 1966-12-24 1968-12-27
DE2135791B2 (de) * 1970-07-18 1976-04-01 Harry Ferguson Ltd., Evenlode Place, Gloucestershire (Großbritannien) Fluessigkeitsreibungskupplung
EP0089764A1 (fr) * 1982-03-19 1983-09-28 Eaton Corporation Accouplement à fluide avec soupape pour réduire l'hystérèse
DE3009665C2 (de) * 1980-03-13 1988-08-18 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Flüssigkeitsreibungskupplung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1245655B (de) * 1961-05-18 1967-07-27 Eaton Yale & Towne Fluessigkeitsreibungskupplung mit insbesondere temperaturabhaengig gesteuerter Fuellung
DE1284186B (de) * 1961-06-07 1968-11-28 Wallace Murray Corp Fluessigkeitsreibungskupplung
DE1425251A1 (de) * 1962-09-17 1968-11-28 Eaton Yale & Towne Kraftuebertragungskupplung
GB1128597A (en) * 1966-02-14 1968-09-25 Eaton Yale & Towne Fluid coupling
FR1551318A (fr) * 1966-12-24 1968-12-27
DE2135791B2 (de) * 1970-07-18 1976-04-01 Harry Ferguson Ltd., Evenlode Place, Gloucestershire (Großbritannien) Fluessigkeitsreibungskupplung
DE3009665C2 (de) * 1980-03-13 1988-08-18 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Flüssigkeitsreibungskupplung
EP0089764A1 (fr) * 1982-03-19 1983-09-28 Eaton Corporation Accouplement à fluide avec soupape pour réduire l'hystérèse

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190984B (en) * 1986-05-27 1990-07-25 Household Mfg Inc Fluid shear coupling apparatus
GB2207492A (en) * 1987-07-29 1989-02-01 Viscodrive Gmbh Viscous shear coupling
FR2618735A1 (fr) * 1987-07-29 1989-02-03 Viscodrive Gmbh Systeme d'entrainement et coupleur hydraulique pour vehicule a quatre roues motrices avec un accouplement pour faire participer a la propulsion des roues non entrainees constamment
US4874058A (en) * 1987-07-29 1989-10-17 Viscodrive Gmbh Viscous shear coupling
GB2207492B (en) * 1987-07-29 1991-03-13 Viscodrive Gmbh Viscous shear coupling
GB2210144A (en) * 1987-09-22 1989-06-01 Usui Kokusai Sangyo Kk Viscous shear fan coupling
GB2210144B (en) * 1987-09-22 1991-11-13 Usui Kokusai Sangyo Kk Temperature-sensitive fluid fan coupling
EP0315444A1 (fr) * 1987-11-05 1989-05-10 LUCAS INDUSTRIES public limited company Freins à disque pour véhicules du type à refroidissement par liquide
GB2229256A (en) * 1989-03-13 1990-09-19 Viscodrive Gmbh Fluid friction coupling with closing slide
FR2644534A1 (fr) * 1989-03-13 1990-09-21 Viscodrive Gmbh Coupleur hydraulique et a friction comportant une chambre supplementaire receptrice de fluide visqueux
GB2229256B (en) * 1989-03-13 1993-04-14 Viscodrive Gmbh Fluid friction coupling with closing slide

Also Published As

Publication number Publication date
DE3534999A1 (de) 1986-04-10
EP0229063A1 (fr) 1987-07-22

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