EP1532029A2 - Frein a friction mecanique et son procede de fonctionnement - Google Patents

Frein a friction mecanique et son procede de fonctionnement

Info

Publication number
EP1532029A2
EP1532029A2 EP03773611A EP03773611A EP1532029A2 EP 1532029 A2 EP1532029 A2 EP 1532029A2 EP 03773611 A EP03773611 A EP 03773611A EP 03773611 A EP03773611 A EP 03773611A EP 1532029 A2 EP1532029 A2 EP 1532029A2
Authority
EP
European Patent Office
Prior art keywords
brake
friction
braking
braking force
pulsation
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Withdrawn
Application number
EP03773611A
Other languages
German (de)
English (en)
Inventor
Uwe Kröger
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.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
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 Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH, Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Publication of EP1532029A2 publication Critical patent/EP1532029A2/fr
Withdrawn legal-status Critical Current

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
    • F16D65/00—Parts or details
    • F16D65/0006—Noise or vibration control
    • F16D65/0012—Active vibration dampers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
    • B61H1/00—Applications or arrangements of brakes with a braking member or members co-operating with the periphery of the wheel rim, a drum or the like

Definitions

  • the invention relates to a friction brake with which a vehicle can be braked or brought to a standstill.
  • a friction brake has a friction lining which is constructed from a friction material.
  • a braking force is applied to the friction lining so that the working surface of the friction lining is pressed against the friction surface of a wheel to be braked or a brake disc or a brake drum.
  • a brake cylinder, a lever transmission and an adjustment mechanism are generally assigned to the friction lining.
  • the invention is particularly applicable to disc brakes for motor vehicles as well as for railways. See for example DE 195 42 524.
  • the brake pads that have been made up to now are in one piece and represent the friction material block themselves.
  • Materials of the brake pads or friction material blocks are pearlitic gray cast iron with lamellar graphite, plastic or sintered material consisting of a mixture of different materials in synthetic resin or Buna bond, made of fine metal powder such as There is iron, copper, non-ferrous metal.
  • a brake pad which comprises a multiplicity of friction material blocks which are separated by an elastic layer.
  • the individual blocks of friction material are attached transversely to the longitudinal direction of the brake shoe.
  • DE 24 18 024 shows a carbon-containing aircraft brake disc consisting of a strong, durable center core and linings made of lightweight wear material attached to both sides.
  • the wear materials are connected to the center core by an adhesive layer.
  • DE 30 33 936 shows a brake shoe with several brake pads that are very easy to change.
  • brake pads With regard to the embodiments of brake pads, reference is further made, for example, to "Brakes for Rail Vehicles, Manual - Braking Terms and Values, Knorr-Bremse AG Kunststoff, 1990", pages 22 and 23.
  • the contact pattern is insufficient due to thermal expansion and axial displacements.
  • the poor contact pattern leads to the formation of corrugations or crumbling in the wheel tread and, as a result, to a high level of noise when braking.
  • the invention has for its object to provide a friction brake or a method for operating it, whereby the noise generated during braking can be reduced or canceled.
  • the inventor has therefore taken a different path than the prior art shows. He was not concerned with the design of the friction lining and its friction material. Rather, he recognized that the squeaking noise when braking is due to a vibration problem. Accordingly, he suggests influencing the vibrations that occur in a brake of the type mentioned or in its components, so that no squeaking noise can form.
  • the specific solution is to vary the frictional force exerted on the friction surface of a wheel by means of the friction lining. One could also say that the vibrations are impaired or disturbed according to the invention.
  • Friction brakes of the type mentioned generally work with brake cylinders, as mentioned above.
  • the pressure pulses can be rhythmic. They can be periodic or aperiodic. Pressure drops can be generated so that the pressure in the brake cylinder drops to a very small value or even to zero. The waste can be extremely sharp so that it takes place within a very short period of time.
  • the spring damping mass system is continuously changed, and with it the natural frequency of the system.
  • a great advantage of the invention is that it can be used regardless of the type of brake pad and the other structure of the brake. This applies in particular to modern brake pads for disc brakes in rail vehicles. Such brake pads exist for example! from sintered metal.
  • a particularly interesting way of implementing the invention is to control the pressure in the brake cylinder by means of a valve which works in the manner of an anti-skid valve.
  • anti-skid valves are used to prevent the wheels from slipping or sliding when braking (so-called anti-lock braking system). Exactly those anti-skid valves can be used that are used in such an anti-lock braking system.
  • a modified brake software controls the anti-skid valves according to the invention, for example in a rhythmic manner.
  • the pressure in the brake cylinder is increased in such a way that the pressure averaged over the braking time and the associated braking distance remain approximately unchanged as before. Only in the case of rapid braking can braking be carried out in the previous manner for safety reasons.
  • braking is intended to achieve a certain average coefficient of friction. This should also be maintained when applying the invention.
  • a higher pressure value in the brake cylinder is initially assumed so that the average friction path is maintained - despite the lowering according to the invention in the context of a pulsation.
  • the invention has proven to be extremely effective in the test.
  • the squeaking noise can be completely avoided. In practice, this means that any noise protection measures can be dispensed with and that there is no nuisance to people.
  • designing a brake in particular When selecting the friction material, there is no longer any need to consider reducing the noise, since this problem is solved by the invention.
  • the invention can be implemented relatively easily and with little construction effort. It is therefore also very inexpensive.
  • Figure 1 shows a perspective view of a disc brake.
  • Figure 2 shows a schematic representation of a block brake for a rail vehicle with a partially shown wheel of the vehicle.
  • the disc brake shown in FIG. 1 is used to brake a brake disc 1.
  • the disc brake has a brake caliper 3.
  • a piston 5 is arranged in a housing 4.
  • a friction ring 2, 2 is assigned to both the piston 5 and the fixed part of the brake. When braking, piston 5 is acted on such that the two friction rings 2, 2 are pressed against the brake disc 1.
  • the wreath 10 of a railway wheel can be seen in FIG.
  • a brake pad which represents the friction lining 20, is assigned to its tread.
  • the friction surface of the friction lining 20 works together with the tread of the wheel rim 10.

Landscapes

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

Abstract

L'invention se rapporte à un frein à friction mécanique, conçu en particulier pour un véhicule sur rails, ainsi qu'à un procédé de fonctionnement de ce frein à friction. Le frein à friction selon l'invention est caractérisé en ce qu'il comporte : une garniture de friction constituée d'un matériau de friction et destinée à appliquer une force frictionnelle de freinage sur une surface de friction d'un composant rotatif à ralentir ; ainsi qu'un système de serrage conçu pour appliquer une force de freinage sur cette garniture de friction. Selon l'invention, un dispositif de pulsation servant à générer une pulsation de la force de freinage est prévu.
EP03773611A 2002-08-21 2003-08-19 Frein a friction mecanique et son procede de fonctionnement Withdrawn EP1532029A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10238251 2002-08-21
DE2002138251 DE10238251A1 (de) 2002-08-21 2002-08-21 Mechanische Reibbremse sowie Verfahren zu deren Betreiben
PCT/EP2003/009148 WO2004018891A2 (fr) 2002-08-21 2003-08-19 Frein a friction mecanique et son procede de fonctionnement

Publications (1)

Publication Number Publication Date
EP1532029A2 true EP1532029A2 (fr) 2005-05-25

Family

ID=31197177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03773611A Withdrawn EP1532029A2 (fr) 2002-08-21 2003-08-19 Frein a friction mecanique et son procede de fonctionnement

Country Status (4)

Country Link
EP (1) EP1532029A2 (fr)
AU (1) AU2003282004A1 (fr)
DE (1) DE10238251A1 (fr)
WO (1) WO2004018891A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009054537A1 (de) * 2009-12-11 2011-06-16 Robert Bosch Gmbh Verfahren zur Vermeidung von Bremsenquietschen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262557A1 (de) * 1972-12-21 1974-06-27 Teldix Gmbh Anordnung zum vermeiden des quietschens beim bremsen von fahrzeugraedern
US5279401A (en) * 1988-11-08 1994-01-18 Uni-Cardan Ag Method for controlling friction clutches or brakes
DE3924445A1 (de) * 1989-07-24 1991-02-07 Knorr Bremse Ag Druckluftbremseinrichtung fuer schienenfahrzeuge
US5108159A (en) * 1990-10-26 1992-04-28 Allied-Signal Inc. Noise attenuated anti-lock brake system
DE19634330C2 (de) * 1996-08-24 1998-11-12 Sab Wabco Kp Gmbh Einrichtung zum Regeln des Bremszylinderdruckes an Rädern von Schienenfahrzeugen
DE19804676A1 (de) * 1998-02-06 1999-08-12 Audi Ag Verfahren zum Vermeiden von Quietschgeräuschen an Bremsanlagen
DE19931081A1 (de) * 1999-07-06 2001-01-11 Bosch Gmbh Robert Verfahren zur Variation der Bremskraft einer Fahrzeugbremse und Fahrzeugbremse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004018891A3 *

Also Published As

Publication number Publication date
WO2004018891A3 (fr) 2004-04-08
DE10238251A1 (de) 2004-03-04
AU2003282004A1 (en) 2004-03-11
WO2004018891A2 (fr) 2004-03-04
AU2003282004A8 (en) 2004-03-11

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