WO2004018891A2 - Mechanical friction brake and method for operating the latter - Google Patents
Mechanical friction brake and method for operating the latter Download PDFInfo
- Publication number
- WO2004018891A2 WO2004018891A2 PCT/EP2003/009148 EP0309148W WO2004018891A2 WO 2004018891 A2 WO2004018891 A2 WO 2004018891A2 EP 0309148 W EP0309148 W EP 0309148W WO 2004018891 A2 WO2004018891 A2 WO 2004018891A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brake
- friction
- braking
- braking force
- pulsation
- Prior art date
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.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003282004A AU2003282004A1 (en) | 2002-08-21 | 2003-08-19 | Mechanical friction brake and method for operating the latter |
EP03773611A EP1532029A2 (en) | 2002-08-21 | 2003-08-19 | Mechanical friction brake and method for operating the latter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10238251.4 | 2002-08-21 | ||
DE2002138251 DE10238251A1 (en) | 2002-08-21 | 2002-08-21 | Mechanical friction brake and method for operating it |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004018891A2 true WO2004018891A2 (en) | 2004-03-04 |
WO2004018891A3 WO2004018891A3 (en) | 2004-04-08 |
Family
ID=31197177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/009148 WO2004018891A2 (en) | 2002-08-21 | 2003-08-19 | Mechanical friction brake and method for operating the latter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1532029A2 (en) |
AU (1) | AU2003282004A1 (en) |
DE (1) | DE10238251A1 (en) |
WO (1) | WO2004018891A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009054537A1 (en) * | 2009-12-11 | 2011-06-16 | Robert Bosch Gmbh | Method for avoiding brake squeal |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3929380A (en) * | 1972-12-21 | 1975-12-30 | Teldix Gmbh | Method and arrangement for applying oscillating braking pressures to vehicle wheels |
EP0410145A2 (en) * | 1989-07-24 | 1991-01-30 | Knorr-Bremse Ag | Pneumatic brake device for railway vehicles |
US5108159A (en) * | 1990-10-26 | 1992-04-28 | Allied-Signal Inc. | Noise attenuated anti-lock brake system |
US5279401A (en) * | 1988-11-08 | 1994-01-18 | Uni-Cardan Ag | Method for controlling friction clutches or brakes |
DE19634330A1 (en) * | 1996-08-24 | 1998-02-26 | Sab Wabco Kp Gmbh | Brake cylinder pressure regulating device for rail vehicle |
DE19804676A1 (en) * | 1998-02-06 | 1999-08-12 | Audi Ag | Noise prevention method for automobile braking system |
DE19931081A1 (en) * | 1999-07-06 | 2001-01-11 | Bosch Gmbh Robert | Method for varying the braking force of a vehicle brake and vehicle brake |
-
2002
- 2002-08-21 DE DE2002138251 patent/DE10238251A1/en not_active Withdrawn
-
2003
- 2003-08-19 EP EP03773611A patent/EP1532029A2/en not_active Withdrawn
- 2003-08-19 WO PCT/EP2003/009148 patent/WO2004018891A2/en not_active Application Discontinuation
- 2003-08-19 AU AU2003282004A patent/AU2003282004A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3929380A (en) * | 1972-12-21 | 1975-12-30 | Teldix Gmbh | Method and arrangement for applying oscillating braking pressures to vehicle wheels |
US5279401A (en) * | 1988-11-08 | 1994-01-18 | Uni-Cardan Ag | Method for controlling friction clutches or brakes |
EP0410145A2 (en) * | 1989-07-24 | 1991-01-30 | Knorr-Bremse Ag | Pneumatic brake device for railway vehicles |
US5108159A (en) * | 1990-10-26 | 1992-04-28 | Allied-Signal Inc. | Noise attenuated anti-lock brake system |
DE19634330A1 (en) * | 1996-08-24 | 1998-02-26 | Sab Wabco Kp Gmbh | Brake cylinder pressure regulating device for rail vehicle |
DE19804676A1 (en) * | 1998-02-06 | 1999-08-12 | Audi Ag | Noise prevention method for automobile braking system |
DE19931081A1 (en) * | 1999-07-06 | 2001-01-11 | Bosch Gmbh Robert | Method for varying the braking force of a vehicle brake and vehicle brake |
Also Published As
Publication number | Publication date |
---|---|
AU2003282004A1 (en) | 2004-03-11 |
DE10238251A1 (en) | 2004-03-04 |
EP1532029A2 (en) | 2005-05-25 |
WO2004018891A3 (en) | 2004-04-08 |
AU2003282004A8 (en) | 2004-03-11 |
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