SE182041C1

SE182041C1 - Device for braking a vehicle

Info

Publication number: SE182041C1
Application number: SE987060A
Authority: SE
Inventors: Roger Fagel
Original assignee: Acec
Priority date: 1959-11-18
Filing date: 1960-10-14
Publication date: 1963-01-02
Also published as: BE597198A; CH365102A; DE1144755B; FR1254931A; AT225302B

Description

Uppfinnare: R Fagel Prioritet begard [rein den 18 november 1959 (Frankrike) Det är kant att f8rse fordon, som drivas av elektriska motorer, med en mekanisk bromsanordning, som manovreras exempel-vis medelst en hydraulisk eller pneumatisk anordning, varvid bromsmanoverkraften, t. ex. tryck eller undertryck i den hydrauliska eller pneumatiska anordningen, ãr progressivt variabel t. ex. i beroende av laget av en bromspedal. Vid sadana anordningar innefattar bromspedalens rorelse i allmanhet en kort dOdgang i borjan, innan de mekaniska bromsarna bliva verksamma. Inventor: R Fagel Priority requested [rein on 18 November 1959 (France) It is possible to equip vehicles powered by electric motors with a mechanical braking device, which is maneuvered for example by means of a hydraulic or pneumatic device, whereby the braking maneuvering force, t. ex. pressure or negative pressure in the hydraulic or pneumatic device, is progressively variable e.g. depending on the team of a brake pedal. In such devices, the movement of the brake pedal generally includes a short start in the beginning, before the mechanical brakes become effective.

Foreliggande uppfinning liar till andamal att utnyttja denna korta dodgang hos bromsmanOverelementet for paverkande av en elektrisk broms. I delta syfte innefattar bromsanordningen enligt uppfinningen en manoveranordning, som paverkas av manoverkraften Mr de mekaniska bromsarna, vilken manoveranordning astadkommer inforande av ett bromsmotstand i den krets, som forbinder de elektriska motorerna med generatorn, och en variation av magnetiseringsstrommen for de elektriska motorerna i beroende av manoverkraften fi5r de mekaniska bromsarna. It is an object of the present invention to utilize this short deadlift of the brake control element to actuate an electric brake. To this end, the braking device according to the invention comprises an actuating device which is actuated by the actuating force Mr the mechanical brakes, which actuating device causes the introduction of a braking resistor in the circuit connecting the electric motors to the generator, and a variation of the excitation current of the electric motors. the maneuvering force for the mechanical brakes.

Uppfinningen skall narmare forklaras med avseende pa ett utforingsexempel, for vilket ett kopplingsschema visas pa ritningen. The invention will be explained in more detail with reference to an exemplary embodiment, for which a wiring diagram is shown in the drawing.

Pa ritningen visas en generator 1, som ma-tar Lva elektriska motorer 2 och 3, forsedda lined inbordes oberoende magnetiseringslindningar 4 och 5. Dessa motorer paverka hjulen hos ett icke visat fordon. I den krets, som forbinder generatorn 1 med de elektriska motorerna 2 och 3, är insatt ett motstand 6, som under fordonets normala gang Or kortslutet medelst en kontaktanordning 7. The drawing shows a generator 1, which feeds Lva electric motors 2 and 3, provided with in-line independent magnetizing windings 4 and 5. These motors act on the wheels of a vehicle (not shown). In the circuit which connects the generator 1 with the electric motors 2 and 3, a resistor 6 is inserted, which during the normal running of the vehicle Or is short-circuited by means of a contact device 7.

For bromsning av fordonet är en bromspedal 8 fOrbunden dels med en tryckluftbehallare via en ledning 9 och dels med en meka nisk bromsanordning 10 samt en elektrisk bromsanordning. Den elektriska bromsanordningen innefattar dels en strombrytare 11, som mojliggor att genom paverkande av kontaktanordningen 7 infora motstandet 6 i den krets, som forbinder generatorn 1 med de elektriska motorerna 2 och 3. A andra sidan innefattar bromsanordningen en pneumatisk anordning 12, som verkar p0. ett variabelt mot-stand, t. ex. en kolstapel 13, som mojliggor variering av magneLiseringsstrommen i lindningarna 4 och 5 hos motorerna 2 och 3. For braking the vehicle, a brake pedal 8 is connected partly to a compressed air tank via a line 9 and partly to a mechanical braking device 10 and an electric braking device. The electric braking device comprises on the one hand a circuit breaker 11, which makes it possible to insert the resistor 6 into the circuit connecting the generator 1 to the electric motors 2 and 3 by actuating the contact device 7. On the other hand, the braking device comprises a pneumatic device 12, which acts on. a variable resistor, e.g. a carbon stack 13, which allows variation of the magnetizing current in the windings 4 and 5 of the motors 2 and 3.

Genom nedtryckning av bromspedalen 8 inkopplar strOmbrytaren 11 kontaktanordningen 7, som infogar bromsmotstandet 6 i str8mkretsen. Alltefter laget av pedalen 8 varierar trycket i den ledning, som gar till anordningarna 10 och 12. Under det att manOverkraften for pfiverkande av den mekaniska bromsanordningen skall overstiga ett visst krafttroskelvarde, är anordningen 12 sadan, att den verkar for manoverkrafter mindre an detta troskelvarde. Genom att sMunda Mit nedtrycka bromspedalen kommer blott den elektriska bromsningen att verka. Motstandet 13 varierar i beroende av trycket i den pneumatiska anordningen 12. Motstandet 13 är sh anordnat, att det minskas, ndr man nedtrycker pedalen prier och mer, sa att magnetiseringsstrommen i lindningarna 4 och 5 Ras. Eftersom i detta ogonblick den egentliga hastighetsregleringsanordningen icke paverkas och eftersom generatorn 1 foljaktligen praktiskt taget icke lamnar flagon spanning, kommer den av de som generatorer arbetande motorerna 2 och 3 avgivna effekten att upptagas av motstandet 6. Fran och med en viss bromsmanoverkraft Or magnetiserin.gsstrommen maximal; denna bromsmanoverkraft valjes ungefar lika med, och foretradesvis nagot 2— — mindre an namnda krafttroskelvarde, ovanfor vilket de mekaniska bromsarna paverkas och mojliggora fullstandigt stannande av fordonet. By depressing the brake pedal 8, the switch 11 engages the contact device 7, which inserts the brake resistor 6 into the circuit. Depending on the position of the pedal 8, the pressure varies in the line leading to the devices 10 and 12. While the operating force for actuating the mechanical braking device must exceed a certain force threshold value, the device 12 is such that it acts for operating forces less than this threshold value. By depressing My brake pedal, only the electric brake will work. The resistance 13 varies depending on the pressure in the pneumatic device 12. The resistance 13 is arranged so that it is reduced when the pedal is depressed more and more, so that the excitation current in the windings 4 and 5 is reduced. Since at this moment the actual speed control device is not affected and since the generator 1 consequently practically does not leave the flagon voltage, the power emitted by the motors 2 and 3 acting as generators will be absorbed by the resistor 6. From a certain braking maneuvering force. maximum; this braking maneuvering force is chosen approximately equal to, and preferably somewhat less than, the said force threshold value, above which the mechanical brakes are actuated and enable complete stopping of the vehicle.

Claims

1. Patent claim:

2. Device for braking a vehicle driven by electric motors, supplied by a unit consisting of a generator and an internal combustion engine, in which upon actuation of the brake actuator first an electric braking device is actuated and then a mechanical braking device, characterized in that it is arranged so that during braking first contacts of a contactor (7) are opened, arranged to introduce a braking resistor (6) into the main circuit of the wheels driving the motors, and that by increasing the braking maneuvering force during a spruce response a variable resistance (13) is overcome, which is arranged to reduce the excitation current for the motors (2,

3.), and that above the delta spruce value of the braking force a mechanical braking system (10) is affected. Request publications: Patents for Great Britain 474 028; Germany 959 881 Stockholm 1903. Kungl. Boktr. P. A. Norstedt & Soner. 380080