FR2501316A1 - HYDRODYNAMIC BRAKE - Google Patents

HYDRODYNAMIC BRAKE Download PDF

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Publication number
FR2501316A1
FR2501316A1 FR8203508A FR8203508A FR2501316A1 FR 2501316 A1 FR2501316 A1 FR 2501316A1 FR 8203508 A FR8203508 A FR 8203508A FR 8203508 A FR8203508 A FR 8203508A FR 2501316 A1 FR2501316 A1 FR 2501316A1
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FR
France
Prior art keywords
piston
groove
braking torque
working chamber
orifice
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.)
Granted
Application number
FR8203508A
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French (fr)
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FR2501316B1 (en
Inventor
Jan Dostal
Karel Kollovsky
Josef Chrastil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PRAGA Z K GOTTWALDA NP
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PRAGA Z K GOTTWALDA NP
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Publication date
Application filed by PRAGA Z K GOTTWALDA NP filed Critical PRAGA Z K GOTTWALDA NP
Publication of FR2501316A1 publication Critical patent/FR2501316A1/en
Application granted granted Critical
Publication of FR2501316B1 publication Critical patent/FR2501316B1/en
Expired legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D57/00Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
    • F16D57/04Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders with blades causing a directed flow, e.g. Föttinger type

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a hydrodynamic brake which is intended to produce a reduced braking torque in the disengaged operating condition. For this purpose, a groove is formed in a fixed blade wheel, the said groove opening into the working space. Arranged in this groove is a coaxially displaceable orifice which is firmly connected to a piston which is supported in a cut-out in the fixed blade wheel and has an inner and an outer sealing ring. Supported against the end wall of the piston are springs which, in the disengaged condition, push the orifice into the working space and form an obstacle to the flow of the air and oil mist in order thereby the reduce the braking torque. In the engaged condition, the pressure fluid forces the orifice out of the working cavity into the groove such that it does not hinder the flow of the fluid in the working cavity.

Description

La présente invention concerne un frein hydrodynamique à couple de freinage réduit dans la condition de desserrage. Un tel frein est notamment utilisable dans des véhicules automobiles et des machines de construction. The present invention relates to a hydrodynamic brake with reduced braking torque in the release condition. Such a brake can be used in particular in motor vehicles and construction machines.

Les freins hydrodynamiques utilisés jusqu'à maintenant sont desserrés en reliant leur chambre de travail au conduit de décharge menant au réservoir, de telle sorte que le liquide de travail puisse être expulsé. Dans la chambre de travail du frein hydrodynamique, il subsiste cependant de l'air en même temps qu'un reste de liquide, ce qui provoque un certain couple de freinage. Ce couple de perte peut atteindre jusqu'à quelques dizaines de Nm et augmente la consommation en carburant. Les procédés connus pour diminuer ces pertes -par exemple en aspirant l'air de la chambre de travail à l'aide d'une pompe à vide particulière ou bien en séparant la roue à aubes immobile (stator) en deux parties, qui sont partiellement décalées angulairement l'une par rapport à l'autre- sont compliqués, motteux et ont une influence sur l'encombrement. The hydrodynamic brakes used until now are released by connecting their working chamber to the discharge conduit leading to the reservoir, so that the working liquid can be expelled. In the working chamber of the hydrodynamic brake, however, air remains at the same time as a liquid residue, which causes a certain braking torque. This loss torque can reach up to a few tens of Nm and increases fuel consumption. Known methods for reducing these losses - for example by sucking air from the working chamber using a special vacuum pump or by separating the stationary impeller (stator) into two parts, which are partially angularly offset from each other- are complicated, clumpy and have an influence on the size.

Les inconvénients précités sont éliminés avec le frein hydrodynamique selon l'invention, dont le couple de freinage est réduit dans la condition de desserrage, ce frein étant caractérisé en ce que, dans la roue à aubes immobile (stator) il est prévu une encoche ob creusure qui pénètre dans la chambre de travail. Dans cette encoche se trouve un diaphragme à débattement maximal, qui est relié à un piston déplaçable dans un evidement de la roue à aubes immobile. Le piston est pourvu d'une bague extérieure d'étanchéité et d'une bague intérieure d'étanchéité, des ressorts s'appuyant contre le cOté frontal du piston. The aforementioned drawbacks are eliminated with the hydrodynamic brake according to the invention, the braking torque of which is reduced in the release condition, this brake being characterized in that, in the stationary paddle wheel (stator), a notch is provided. recess that enters the working chamber. In this notch is a diaphragm with maximum clearance, which is connected to a piston displaceable in a recess of the stationary paddle wheel. The piston is provided with an outer sealing ring and an inner sealing ring, springs pressing against the front side of the piston.

Avec l'agencement du frein hydrodynamique selon l'invention, on obtient d'une manière simple et peu incombrante une diminution du couple de freinage dans la condition de desserrage jusqu'd une valeur négligeable, le fonctionnement du frein n'étant pratiquement pas modifié dans la condition de serrage. With the arrangement of the hydrodynamic brake according to the invention, a reduction is obtained in a simple and space-saving manner in the braking torque under the release condition up to a negligible value, the operation of the brake being practically unchanged in the tightening condition.

D'autres avantages et caractéristiques de l'invention seront mis en évidence dans la suite de la description, donnée à titre d'exemple non limitatif, en référence au dessin unique annexé qui est une coupe axiale du frein selon l'invention. Other advantages and characteristics of the invention will be highlighted in the following description, given by way of nonlimiting example, with reference to the single appended drawing which is an axial section of the brake according to the invention.

Le frein hydrodynamique à couple de freinage réduit dans la condition de desserrage est constitué d'une roue à aubes 1 tournante ou rotor et d'une roue à aubes 2 immobile ou stator; une chambre de travail 3 est formée entre ces roues. Dans la roue à aubes 2 immobile, il est prévu une encoche ou creusure 4 qui pénètre dans la chambre de travail 3. Dans cette encoche 4 est disposé un diaphragme 8 mobile axialement et relié rigidement à un piston 5 qui est monté dans un évidement 10 de la roue à aubes 2 immobile. Le piston 5 est pourvu d'une bague extérieure d'étanchéité 6 et d'une bague intérieure d'étanchéité 7. Sur le cOté frontal du piston 5 s'appuient des ressorts 9. La force exercée par la pression du liquide dans la chambre de travail 3 agit sur le piston 5 de l'autre cOté.  The hydrodynamic brake with reduced braking torque in the release condition consists of a rotating impeller 1 or rotor and a stationary impeller 2 or stator; a working chamber 3 is formed between these wheels. In the stationary paddle wheel 2, a notch or recess 4 is provided which penetrates into the working chamber 3. In this notch 4 is disposed a diaphragm 8 movable axially and rigidly connected to a piston 5 which is mounted in a recess 10 of the impeller 2 stationary. The piston 5 is provided with an outer sealing ring 6 and an inner sealing ring 7. On the front side of the piston 5 there are springs 9. The force exerted by the pressure of the liquid in the chamber working 3 acts on the piston 5 on the other side.

Dans-la condition de desserrage, le piston 5 pousse vers la chambre de travail 3, sous l'action des ressorts 9, le diaphragme 8 mobile axialement dans l'encoche 4. In the condition of loosening, the piston 5 pushes towards the working chamber 3, under the action of the springs 9, the diaphragm 8 movable axially in the notch 4.

Ce diaphragme mobile axialement constitue alors un obstacle s'opposant à un écoulement d'air ou de brouillard d'huile vers l'intérieur de la chambre de travail 3 et il diminue ainsi le couple de freinage. This axially movable diaphragm then constitutes an obstacle opposing an air or oil mist flow towards the interior of the working chamber 3 and it thus reduces the braking torque.

Dans la condition de serrage de frein, après le remplissage de la chambre de travail 3 avec du liquide sous pression, la force exercée par la pression du liquide sur le piston 5 contrebalance la force des ressorts 9 et le diaphragme 8 est déplacé dans l'encoche 4; le piston 5 sort alors de la chambre de travail 3, empêche la pénétration du liquide dans la chambre de travail 3 et permet ainsi la génération du couple maximal de freinage. La force des ressorts 9 peut être remplacée par la pression du liquide à une valeur appropriée et sélectionnée.  In the brake application condition, after filling the working chamber 3 with pressurized liquid, the force exerted by the pressure of the liquid on the piston 5 counterbalances the force of the springs 9 and the diaphragm 8 is moved in the notch 4; the piston 5 then leaves the working chamber 3, prevents the penetration of the liquid into the working chamber 3 and thus allows the generation of the maximum braking torque. The force of the springs 9 can be replaced by the pressure of the liquid at an appropriate and selected value.

Claims (1)

REVENDICATION CLAIM A. Frein hydrodynamique à couple de freinage réduit dans la condition de desserrage, utilisable pour les véhicules automobiles et des machines de construction et se composant d'une roue à aubes immobile ou stator et d'une roue à aubes tournante ou rotor, entre lesquelles est constituée une chambre de travail pour le liquide, caractérisé en ce que la roue à aubes immobile (2) comporte une rainure ou creusure (4) qui débouche dans la chambre de travail (3), et en ce qu'il est prévu dans cette encoche (4) un diaphragme (8) mobile axialement et relié rigidement à un piston (5), lequel est déplaçable dans un évidement (10) de la roue à aubes immobile (2) et est pourvu d'une bague extérieure d'étanchéité (6) et d'une bague intérieure d'étanchéité (7), des ressorts (9) s'appuyant sur la face frontale du piston (5).  A. Hydrodynamic brake with reduced braking torque in the release condition, usable for motor vehicles and construction machinery and consisting of a stationary impeller or stator and a rotating impeller or rotor, between which a working chamber for the liquid is formed, characterized in that the stationary impeller (2) has a groove or recess (4) which opens into the working chamber (3), and in that it is provided in this notch (4) a diaphragm (8) movable axially and rigidly connected to a piston (5), which is displaceable in a recess (10) of the stationary impeller (2) and is provided with an outer ring of sealing (6) and an inner sealing ring (7), springs (9) resting on the front face of the piston (5).
FR8203508A 1981-03-04 1982-03-03 HYDRODYNAMIC BRAKE Expired FR2501316B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS154681A CS221867B1 (en) 1981-03-04 1981-03-04 Hydrodynamical brake

Publications (2)

Publication Number Publication Date
FR2501316A1 true FR2501316A1 (en) 1982-09-10
FR2501316B1 FR2501316B1 (en) 1985-07-12

Family

ID=5350085

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8203508A Expired FR2501316B1 (en) 1981-03-04 1982-03-03 HYDRODYNAMIC BRAKE

Country Status (3)

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CS (1) CS221867B1 (en)
DE (1) DE3207634A1 (en)
FR (1) FR2501316B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002004835A1 (en) * 2000-07-07 2002-01-17 Scania Cv Ab Hydrodynamic brake
EP1972515A3 (en) * 2007-03-21 2011-01-26 ZF Friedrichshafen AG Sealing device for sealing a retarder

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0491817B1 (en) * 1989-09-08 1995-05-03 ZF FRIEDRICHSHAFEN Aktiengesellschaft Device for reducing the idling losses in hydrodynamic brakes
EP0958463B1 (en) * 1997-02-06 2003-12-10 Voith Turbo GmbH & Co. KG Hydrodynamic retarder with an axially displaceable stator
DE102007032935A1 (en) * 2007-07-14 2009-01-15 Zf Friedrichshafen Ag Aperture arrangement in particular for a hydrodynamic brake
DE102008000762A1 (en) * 2008-03-19 2009-09-24 Zf Friedrichshafen Ag Hydrodynamic retarder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE645207A (en) * 1963-03-14 1964-09-14
FR1499704A (en) * 1966-11-10 1967-10-27 Ass Elect Ind Hydraulic coupler
DE1675248A1 (en) * 1968-01-13 1970-12-23 Teves Gmbh Alfred Hydrodynamic brake
FR2188733A5 (en) * 1972-06-07 1974-01-18 Voith Turbo Kg
US4043434A (en) * 1974-08-29 1977-08-23 Parmac, Inc. Mechanically adjustable dual pocket hydromatic brake

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2127738A (en) * 1935-08-14 1938-08-23 Kugel Fritz Hydrodynamic fluid coupling
US3952508A (en) * 1975-03-31 1976-04-27 Eaton Corporation Control for fluid coupling
AU514850B2 (en) * 1976-04-13 1981-03-05 Paemac, Inc Hydromatic brake

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE645207A (en) * 1963-03-14 1964-09-14
FR1499704A (en) * 1966-11-10 1967-10-27 Ass Elect Ind Hydraulic coupler
DE1675248A1 (en) * 1968-01-13 1970-12-23 Teves Gmbh Alfred Hydrodynamic brake
FR2188733A5 (en) * 1972-06-07 1974-01-18 Voith Turbo Kg
US4043434A (en) * 1974-08-29 1977-08-23 Parmac, Inc. Mechanically adjustable dual pocket hydromatic brake

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002004835A1 (en) * 2000-07-07 2002-01-17 Scania Cv Ab Hydrodynamic brake
US6918471B2 (en) 2000-07-07 2005-07-19 Scania Cv Ab (Publ) Hydrodynamic brake
EP1972515A3 (en) * 2007-03-21 2011-01-26 ZF Friedrichshafen AG Sealing device for sealing a retarder

Also Published As

Publication number Publication date
CS221867B1 (en) 1983-04-29
DE3207634A1 (en) 1982-10-21
FR2501316B1 (en) 1985-07-12

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