US3805927A - Electromagnetic rail brake for railroad vehicles - Google Patents

Electromagnetic rail brake for railroad vehicles Download PDF

Info

Publication number
US3805927A
US3805927A US00295214A US29521472A US3805927A US 3805927 A US3805927 A US 3805927A US 00295214 A US00295214 A US 00295214A US 29521472 A US29521472 A US 29521472A US 3805927 A US3805927 A US 3805927A
Authority
US
United States
Prior art keywords
rod
rail brake
electromagnetic
sensors
magnet means
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.)
Expired - Lifetime
Application number
US00295214A
Other languages
English (en)
Inventor
G Tolksdorf
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 AG
Original Assignee
Knorr Bremse 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
Priority claimed from DE19712156657 external-priority patent/DE2156657C3/de
Application filed by Knorr Bremse GmbH filed Critical Knorr Bremse GmbH
Application granted granted Critical
Publication of US3805927A publication Critical patent/US3805927A/en
Assigned to KNORR-BREMSE AKTIENGESELLSCHAFT reassignment KNORR-BREMSE AKTIENGESELLSCHAFT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 08/30/1985 Assignors: KNORR-BREMSE GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
    • B61H7/00—Brakes with braking members co-operating with the track
    • B61H7/02—Scotch blocks, skids, or like track-engaging shoes
    • B61H7/04—Scotch blocks, skids, or like track-engaging shoes attached to railway vehicles
    • B61H7/06—Skids
    • B61H7/08—Skids electromagnetically operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles

Definitions

  • the present invention relates to an electromagnetic rail brake for railroad vehicles travelling on rails equipped with inductive signal control and having sensors located laterally and below the top surface of a rail, more particularly, to the elimination of interference between any stray magnetic fields emanating from the rail brake or the sensors.
  • an inductive signal control system which includes a number of sensors arranged laterally and below the top surface of a rail.
  • false control systems may be emitted in the event the sensors are actuated by a variation in their magnetic field during the passage of railroad vehicles.
  • Such a signal would indicate the passage of the railroad vehicle and possibly its direction of travel.
  • a sensor has released a signal indicating a false direction of travel of a passing railroad vehicle whose electromagnetic rail brake was switched on at that time.
  • Such erroneous indications are particularly frequent in those situations where the rail brake magnet of the electromagnetic rail brake consisted of an eddy-current brake magnet.
  • the use of shields for the sensors has not been particularly satisfactory since such a shielding arrangement becomes very costly when the number of sensors employed in a rail system are considered.
  • an electromagnetic rail brake for railroad vehicles travelling on rails equipped with inductive signal control and having sensors lo cated laterally and below thetop surface of a rail.
  • the rail brake has a magnetic means positioned immediately above the rail top surface.
  • a rod of ferromagnetic material is attached to the rail brake and extends the length of the magnet means. The rod is positioned laterally and downwardly from the magnetic means toward the sensors so that the rod is a conductor for any stray magnetic fields emanating from the rail brake or the sensors.
  • the rod is provided with a straight central portion along the length of the magnetic means and both ends of the rod are bent upwardly and obliquely to approximately the centers of the end surfaces of the magnet means.
  • the bent ends of the rod are rigidly attached to plates adjustably mounted on the ends of the magnet.
  • FIG. 1 is a side elevational view of an electromagnetic rail brake incorporating the present invention
  • FIG. 2 is a front and elevational view of the rail brake of FIG. 1;
  • FIG. 3 is a top plan view of the rail brake of F IG. 1.
  • FIG. 1 there is illustrated a rail brake magnet l of a known structure which is employed in an electromagnetic rail brake as known in the art.
  • the magnet 1 comprises a plurality of poles 2 which are shaped at their lower ends into pole pieces 3 which are positioned immediately above the top surface 4 of a rail indicated at 5 in FIG. 2.
  • the electromagnetic rail brake is actuated, the magnet 1 will be moved into contact with the surface 4 of the rail.
  • a sensor which is a component of the inductive signal control system is indicated at 6 in FIG. 2.
  • the sensor 6 is positioned laterally to and below the rail top surface 4 in such a manner that the flanges of the wheels of a passing railroad vehicle will influence or modify a magnetic field originating in the sensor 6.
  • the sensor 6 may actually comprise a plurality of separate components positioned closely one following the other parallel to the longitudinal axis of the rail so that the direction of travel of the railroad vehicle can be determined from the sequence of pulses of the signals released by these separate sensor components.
  • the rail brake magnet 1 has ends 7 with each end being provided with two bolts 8 whose axes are in parallel with the longitudinal direction of the brake magnet I.
  • a plate 9 having a pair of slots 10 therein is attached to each end 7 of the magnet by means of the bolts 8 being inserted in the slots 10.
  • the slots 10 permit a certain vertical adjustment of the end plates 9 with respect to the rail brake magnet 1. Thus, it is only necessary to loosen slightly the bolts 8 to enable a vertical adjustment of the end plates. 7
  • a rod 11 of a ferromagnetic material has a central portion 12 which extends along the entire length of the brake magnet l.
  • the ends of the rod are bent upwardly and obliquely at 13 and these bent ends are welded to the end plates 9.
  • the rod 11 has a rectangular crosssection and the central section 12 of the rod is positioned such that the shorter dimension edges are substantially horizontal as can be seen in FIG. 2.
  • the rod may also have a circular cross-section or a trapezoidal cross-section which is particularly suitable for attaining maximum effect with optimum utilization of material.
  • the central portion 12 of the rod is disposed laterally and downwardly with respect to the pole pieces 3 in the direction of the sensor 6 as also may be seen in FIG. 2.
  • the central section 12 of rod 11 will then be in a position beside the head of rail 5 wherein the rod can pass closely above the sensors 6 arranged beside the rail.
  • the central section 12 of the rod 11 becomes a very good conductor in comparison with the surrounding atmosphere for any stray magnetic field emanating laterally from the rail brake magnet 1.
  • the stray lines of flux from such a magnetic field will be contained for the most part within the section 12 of the rod.
  • the central section 12 of the rod is a good conductor for the magnetic field emanating from the sensors 6.
  • stray lines of flux from this field are largely concentrated in the rod section 12. Since the stray magnetic fields of both the rail brake magnet and the sensor are both largely concentrated in the rod section 12 these stray fields cannot exert a reciprocal effect between themselves such that false signals would be released from the sensor 6.
  • the sensor 6 When the sensor 6 is passed by a railroad vehicle whose electromagnetic brake is actuated, at the most, the sensor can be induced to release a signal indicating the passage of the railroad vehicle in the correct direction of travel.
  • the possibility of sensor 6 being induced by rail brake magnet l to release a signal corresponding to the false direction of travel is prevented even in those circumstances where the brake magnet consists of an eddy-current brake magnet comprising a pole sequence alternating in the longitudinal direction.
  • the sensor 6 be utilized for controlling a crossing gate along the rail line travelled by the railroad vehicle.
  • the present invention has disclosed an electromagnetic rail brake which effectively prevents the release of falsesignals from sensors of an inductive signal control system wherein the sensors are positioned adjacent the rails over which vehicles equipped with the electromagnetic brake are travelling.
  • An electromagnetic rail brake for railroad vehicles travelling on rails equipped with inductive signal control and having sensors'located laterally and below the top surface of a rail comprising magnet means positioned immediately above the rail top surface, a rod of ferromagnetic material attached to the rail brake and extending the length of the magnet means, said rod being positioned laterally and downwardly from said magnet means toward the sensors whereby the rod is a conductor for any stray magnetic fields emanating from the rail brake or the sensors.
  • An electromagnetic rail brake as claimed in claim 1 wherein said rod has a rectangular cross-section, the central portion of the rod being disposed such that the shorter dimension edges are horizontal.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
US00295214A 1971-11-15 1972-10-05 Electromagnetic rail brake for railroad vehicles Expired - Lifetime US3805927A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712156657 DE2156657C3 (de) 1971-11-15 Magnetschienenbremse für Schienenfahrzeuge

Publications (1)

Publication Number Publication Date
US3805927A true US3805927A (en) 1974-04-23

Family

ID=5825168

Family Applications (1)

Application Number Title Priority Date Filing Date
US00295214A Expired - Lifetime US3805927A (en) 1971-11-15 1972-10-05 Electromagnetic rail brake for railroad vehicles

Country Status (5)

Country Link
US (1) US3805927A (enrdf_load_stackoverflow)
AT (1) AT317290B (enrdf_load_stackoverflow)
ES (1) ES408000A1 (enrdf_load_stackoverflow)
FR (1) FR2160353B1 (enrdf_load_stackoverflow)
IT (1) IT965488B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5862891A (en) * 1994-10-28 1999-01-26 Knorr-Bremse Systeme Fur Scheinenfahrzeuge Gmbh Electromagnetic or permanent-magnetic rail brake
US6041897A (en) * 1996-05-10 2000-03-28 Knorr-Bremse System Fur Schienenfahrzeuge Gmbh Magnetic brake linear eddy current brake
US20040079597A1 (en) * 2000-02-28 2004-04-29 Lothar Schmied Suspension for a rail brake

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3743934A1 (de) * 1987-09-30 1989-04-13 Knorr Bremse Ag Wirbelstromschienenbremse fuer schienenfahrzeuge
DE3842882A1 (de) * 1988-12-20 1990-06-21 Knorr Bremse Ag Verfahren und anordnung zur unterdrueckung des stoereinflusses magnetischer bremsen auf magnetische achszaehler
DE102014113144A1 (de) * 2014-09-11 2016-03-17 Knorr-Bremse Gmbh Abschirmvorrichtung zum Leiten eines magnetischen Feldes für eine Schienenbremse, Magnetkörper für eine Schienenbremse, Schienenbremse für ein Schienenfahrzeug und Verfahren zum Betreiben einer Schienenbremse mit einer Abschirmvorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2207295A (en) * 1938-12-08 1940-07-09 J G Brill Co Rail brake for railway cars
US3067366A (en) * 1958-10-15 1962-12-04 Philips Corp Magnet system having little stray

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2207295A (en) * 1938-12-08 1940-07-09 J G Brill Co Rail brake for railway cars
US3067366A (en) * 1958-10-15 1962-12-04 Philips Corp Magnet system having little stray

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5862891A (en) * 1994-10-28 1999-01-26 Knorr-Bremse Systeme Fur Scheinenfahrzeuge Gmbh Electromagnetic or permanent-magnetic rail brake
US6041897A (en) * 1996-05-10 2000-03-28 Knorr-Bremse System Fur Schienenfahrzeuge Gmbh Magnetic brake linear eddy current brake
US20040079597A1 (en) * 2000-02-28 2004-04-29 Lothar Schmied Suspension for a rail brake
US6769517B2 (en) 2000-02-28 2004-08-03 Knorr-Bremse Systeme Fur Schienenfahrzeuge Gmbh Suspension for a rail brake

Also Published As

Publication number Publication date
DE2156657B2 (de) 1976-10-14
AT317290B (de) 1974-08-26
DE2156657A1 (de) 1973-05-24
FR2160353A1 (enrdf_load_stackoverflow) 1973-06-29
ES408000A1 (es) 1975-11-01
IT965488B (it) 1974-01-31
FR2160353B1 (enrdf_load_stackoverflow) 1976-06-11

Similar Documents

Publication Publication Date Title
US6533083B1 (en) Eddy current braking apparatus
US3805927A (en) Electromagnetic rail brake for railroad vehicles
GB1360834A (en) Propulsion systems
GB1341265A (en) Railway systems
EP0716970B1 (en) Magnetic rail brake device
GB1464655A (en) Railway systems
IT1008597B (it) Dispositivo di frenatura per veicoli ferroviari
US3840096A (en) Electromagnetic rail brake
US3941062A (en) Electromagnetic system for transversely aligning railway rolling stock on rails
EP0309651B1 (de) Wirbelstromschienenbremse für Schienenfahrzeuge
GB1350715A (en) Electromagnetic transport system
EP0530743B1 (de) Einrichtung zur Erfassung von Rädern schienengebundener Fahrzeuge
DE3162479D1 (en) Brake magnet for magnetic rail brakes of rail vehicles
DE1063199B (de) Anordnung bei induktiv beeinflussten Gleisgeraeten fuer das Eisenbahn-sicherungswesen
EP0098611A2 (en) Apparatus for transporting materials to be transferred and method of controlling exciting current therefor
SU456754A1 (ru) Электромагнитное транспортирующее устройство
US1859073A (en) Railway car retarder
RU177451U1 (ru) Замедлитель вагонный электромагнитный
US3699329A (en) Electro-magnetic railway track
GB572356A (en) Improvements relating to inductive pick-up devices for cab-signalling systems of thetrack circuit type for railways and the like
SU518405A1 (ru) Электромагнитный замедлитель вагонов
DE3164767D1 (en) An electromagnetic track brake for a railway vehicle
SU370100A1 (ru) Электромагнитный тормоз для рельсового подвижного состава
ATE297860T1 (de) Vorrichtung zur mechanischen kopplung einer schienenbremse an einem drehgestell eines schienenfahrzeuges (bremskraftmitnehmer)
DE1265772B (de) Einrichtung zur Fahrortbestimmung von Fahrzeugen, insbesondere Schienenfahrzeugen

Legal Events

Date Code Title Description
AS Assignment

Owner name: KNORR-BREMSE AKTIENGESELLSCHAFT

Free format text: CHANGE OF NAME;ASSIGNOR:KNORR-BREMSE GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG;REEL/FRAME:004495/0631

Effective date: 19851018