Electric linear locomotive

United States Patent ui] 3,548,751

<td> [72]</td><td> Inventors</td><td> Georgy Ignatievich Izhelya,</td>

<td> [21]</td><td> Appl. No.</td><td> Ulitsa Malopodvalnaya 14, kv. 13; Konstantin Alexeevich Bykov, Ulitsa Streletskaya 14, kv. 2; Boris Sokratovich Veneraki, Ulitsa Gorkogo 155, kv. 28; Alexandr Ivanovich Vishnikin, Ulitsa Belorusskaya 1, kv. 17; Vladimir Andreevich Mishakin, Ulitsa Selskokhozyaistvennaya 7/9, kv. 19; Sergei Alexeevich Rebrov, Ulitsa Nikolsko, Botanicheskaya 14, kv. 20; Itskhok Avrumovich Spektor, Ulitsa Muromskaya 3, kv. 15, and Alexandr Grigorievich Shapovalenko, Ulitsa Zatonskogo 15/41, kv. 25, all of Kiev, U.S.S.R. 710,221</td>

<td> [22]</td><td> Filed</td><td> Mar. 4,1968</td>

<td> [45]</td><td> Patented</td><td> Dec. 22,1970</td>

[50] Field of Search............................................ 104/118,

120. 138. 148LM. 119; 105/1,26,49,77, 1, 141,

145,215,30

[56] References Cited

UNITED STATES PATENTS 573,823 12/1896 Leffler.......................... 104/148

714,851 12/1902 Albertson..................... 105/77

3,198,139 8/1965 Dark............................ 104/120X

3,225,228 12/1965 Roshala........................ 104/148X

3,233,559 2/1966 Smith et al.................... 105/1

3,403,634 10/1968 Crouder....................... 104/138

Primary Examiner— Arthur L. La Point

Assistant Examiner—Howard Beltran

Attorney—Waters, Roditi, Schwartz &amp; Nissen

[54] ELECTRIC LINEAR LOCOMOTIVE

Claims, 4 Drawing Figs.

[52] U.S.C1........................................................ 104/148,

104/120; 105/49, 105/77, 105/145, 105/215

[51] InLCl.........................................................B60113/00;

B61c 3/00; H02k 41/02

ABSTRACT: The running gear of electric stock employed on electrified monorails, comprising line induction traction motors wherein the rotor is the tractive guide rail, while the split stators are arranged on both sides of said rail, said stators being mounted on a separate bogie connected to the running bogie of the electric stock by means of a rod which transmits only longitudinal, relative to the tractive rail, efforts.

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PATENTED DEC22I970

3,548,751

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PATENTED DEC221970

3^548^751

SHEET 2 OF 2

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3,548,751

ELECTRIC LINEAR LOCOMOTIVE

The invention relates to running gears of electric stock used on a monorail.

The running gear of electric stock employed up to the present time on monorail in Japan, the USA, German Federal Republic, Italy is made in the form of running bogies with driving wheels provided with DC tractive electric drives.

In this case traction effort is transmitted from an electric motor to the driving wheels through a reducing gear. Conversion of rotation produced by the tractive motor armature into forward motion of the running stock is performed by means of adhesion between the driving wheels and the bearing surface of the monorail trestle.

The designers of monorail stock electric drives that have no reducing gears, for instance in the UK, suggest that a railway ¹⁵tractive induction motor should be used, said motor having a split stator whose rotor is a tractive rail made from aluminum bus. In such a construction the split stators of the electric motor arranged on both sides of the tractive rail are rigidly attached to a running bogie of the stock. In this case tractive ef- 20 fort is generated owing to an electromagnetic interaction between the stators and the tractive rail and is transmitted directly to the running bogie making conversion from one kind of energy into another unnecessary .

The running gears of the electric stock for employment on monorails, both in use now and those still under design, have a number of serious disadvantages.

To utilize tractive effort through driving wheels when using a running gear of the stock in conjunction with a DC tractive motor calls not only for a reducing gear but also for a certain amount of adhesion weight which artificially increases the stock weight. What is more, utilization of adhesion force extends exacting requirements to the condition of the bearing surface of the monorail trestle. Besides, a DC electric drive requires converter substations for power supply which substantially detracts from power efficiency.

If the running gear is provided with railway induction motors, one of the major requirements to be met is that a certain minimum air clearance between the split stators and the tractive rail should be kept constant. Deviation of the air clearance from the rated value, especially a larger clearance, while the motor is running, results in unstable tractive performance.

When the split stators of the railway motor are rigidly at- 45 tached to the running bogie, the vibration of the rolling stock1 will influence the amount of air clearance between the stators1 and the tractive rail. Rigid attachment of stators to the running1 bogie causes special trouble on curvilinear sections of the monorail.

Apart from this, employment of a bus made from aluminum, which is nonmagnetic material, reduces the power efficiency of the electric motor because a considerable rise in magnetizing cunent.

The object of this invention is to provide for a constant minimum air clearance between the split stators and the tractive rail, for stable tractive performance of the running electric motor and for its higher power efficiency.

This object is achieved by arranging the split stators of each electric motor on an individual bogie which is connected with 60 means interconnecting said split stators to said second bogie the running gear of the stock by means of a tie that only trans- -- · ... - - mits efforts longitudinal with respect to the tractive rail. Said tie between the bogies may be made in the form of a rod fitted with hinges. For a free lateral movement of the stators inside the bogie, the body of the latter should be provided with 65 interconnecting said bogies includes a rod having a hinge at grooved bars fixed thereto, wherein the guides of split stators travel.

A compensation spring device can also be arranged on the bogie sidewalls, said device being connected by pins with the magnetic circuits of the split stators.

The invention will appreciated better from a description of its exemplary embodiment with the appended drawings, where:

FIG. 1 shows a side view of the running bogie and the bogie carrying the induction motors;

FIG. 2 is a plan view of the same;

FIG. 3 shows a side view of the electric motor bogie, with parts of the body cut out to make visible the grooved bars;

FIG. 4 shows a front view of the electric motor bogie with the clamp of the right stator removed and illustrating the rail 5 and the left clamp 14 in front of the roller 12 in section.

The running gear of the monorail electric stock comprises bogie 1 for the railway induction motor (FIGS. 1 and 2), running bogie 2 and a tie consisting of rod 3 with hinges 4 at its i ends, said rod transmitting the tractive effort from said bogie 1 to running bogie 2. Bogie 1 of the railway induction motor travels over tractive guide rail 5 serving as a rotor of the electric motor and made in the form of a rectangular-shaped steel strip. Employment of tractive rail 5 made from magnetic material allows the reduction of the magnetizing current of the electric motor as compared to that of the motor whose tractive rail is made from aluminum. In addition, a steel tractive rail contributes to be strength of the construction. Tractive rail 5 is rigidly attached on monorail beam 6 of the monorail road.

Bogie 1 of the electric motor comprises body 7 (FIGS. 3,4) ribbed for rigidity, said body serving at the same time as the housing of the electric motor. The bogie of the electric motor runs along tractive rail 5 in a strictly predetermined position with respect to said rail owing to bearing rollers 8 secured by means of levers 9 to axles 10 in body 7 of the bogie. Each electric motor has split stators 11 arranged inside body 7 of bogie 1 on both sides of tractive rail 5. The air clearance between stators 11 and tractive rail 5 is provided with spaced rollers 12 secured to axles 13 of the stator clamp 14. The specified air clearance is obtained by adjusting the position of axles 13 of the spaced rollers 12.

For a free lateral movement of split stators 11 inside bogie 1, body 7 of this bogie is fitted with grooved bars 15 forming transverse guiding slots wherein guides 16 of the stators travel.

Attached to the lateral walls in body 7 of bogie 1 are compensation spring devices 17 which are connected by pins 18 with clamps 14 of the magnetic circuit of stators 11. A compensation device is required because employment of a steel tractive rail results in the generation of magnetic attraction between the magnetic circuits of the motor stators and the tractive rail. This magnetic attraction force is transmitted to space rollers 12 which are unloaded by means of said compensation spring device 17.

The suggested invention can find application not only in monorail road but also in other hauling and hoisting devices, for instance in mining transport means operating on steep tracks, in driving lifts and elevators, in driving bogies and bridges of cranes, etc.