EP0163612B1 - Transmission system for motor-bogies of railway vehicles, and railway vehicles using this transmission system - Google Patents
Transmission system for motor-bogies of railway vehicles, and railway vehicles using this transmission system Download PDFInfo
- Publication number
- EP0163612B1 EP0163612B1 EP85830058A EP85830058A EP0163612B1 EP 0163612 B1 EP0163612 B1 EP 0163612B1 EP 85830058 A EP85830058 A EP 85830058A EP 85830058 A EP85830058 A EP 85830058A EP 0163612 B1 EP0163612 B1 EP 0163612B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output member
- coupling
- teeth
- drive motor
- guide element
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C9/00—Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars
- B61C9/38—Transmission systems in or for locomotives or motor railcars with electric motor propulsion
- B61C9/52—Transmission systems in or for locomotives or motor railcars with electric motor propulsion with transmission shafts at an angle to the driving axles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C9/00—Locomotives or motor railcars characterised by the type of transmission system used; Transmission systems specially adapted for locomotives or motor railcars
- B61C9/08—Transmission systems in or for locomotives or motor railcars with IC reciprocating piston engines
- B61C9/26—Transmission systems in or for locomotives or motor railcars with IC reciprocating piston engines with transmission shafts at an angle to the driving axles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F3/00—Types of bogies
- B61F3/02—Types of bogies with more than one axle
- B61F3/04—Types of bogies with more than one axle with driven axles or wheels
Definitions
- the present invention relates generally to railway vehicles with motor-bogies with a pair of spaced-apart driving axles rotated by at least one drive motor through transmission means between the drive motor and each driving axle, wherein said at least one motor is supported in such a way that it is not coupled to the bogie.
- a transmission system of the above-mentioned type is known generally from US-A-3408954.
- the invention concerns railway vehicles of the type defined above, in which the or each drive motor is supported by the body of the vehicle and is therefore independent of and not coupled to the respective bogie.
- the object of the present invention is precisely that of avoiding these disadvantages, by providing a transmission system for railway vehicles of the type defined initially, which is capable of ensuring a noticeably greater degree of relative movement between the motors and axles compared to conventional transmission means, ensuring at the same time a drastic reduction in the weight which affects the motion of the bogies and a significant facilitation of the installation of the motors and the changing of the gear ratios.
- this object is achieved by means of a transmission system for motor-bogies of railway vehicles such as defined in the characterizing portion of claim 1.
- the transmission system according to the invention is capable of allowing angles and relative movements of a significant degree between the axles and motor, and permits the following important advantages to be achieved compared with conventional solutions:
- the transmission system according to the invention gives the bogie in which it is used considerable stability, above all laterally, at the same time reducing the "rail aggressiveness" of the vehicle.
- the structure of the bogie 10 supports a pair of spaced-apart axles comprising respective driving axles 14, 16 driven by an electric drive motor 22 through two drive-shafts 18, 20.
- the motor 22 is supported by the body 12 and is therefore not coupled to the bogie 10, and drives the two drive-shafts 18, 20 by means of a transmission system, generally indicated 24 in Figure 1.
- the transmission system 24 comprises a coupling 26 contained in a lubricating casing 28 out of which the two drive-shafts 18, 20 project through seals, and driven in rotation by means of a gear wheel 30 forming part of a reduction gear incorporated in the casing 28 and driven by the shaft of the drive motor 22.
- the axis of rotation of the wheel 30 is parallel to the longitudinal axis L of the bogie 10.
- the coupling 26 includes an annular input member 32 supported rotatably by the casing 28 about an axis B parallel to the axis of rotation A of the toothed wheel 30 by means of rolling bearings 29.
- the input member 32 has an external ring gear 34 meshing with the gear wheel 30, and a pair of axially spaced internal gears 36, 38. Between each of the sets of teeth 36, 38 and the external body of the input member 32, is defined a lateral annular stop surface 40, 42 the function of which will be explained below.
- Two intermediate rotary members 44, 46 each comprise a disc-like part 47, 48 carrying an annular part 50, 52 concentric on 0,0 with a respective internal gear 36, 38 of the input member 32.
- Each annular part 50, 52 has an external ring gear 54, 56 with barrel-shaped teeth which mesh with the internal gears 36,38 of the input member 32 in such a way as to define a respective first coupling 58, 56 with barrel-shaped teeth.
- Each annular element 50, 52 also has an internal gear 62, 64 and is provided, on its end opposite the respective disc 47, 48, with an annular member 66, 68 forming respective stops 70, 72 for cooperating with the stop surfaces 40 and 42 in the manner explained in what follows.
- the disc parts 47 and 48 of the two rotary input members 44 and 46 have central coupling parts 74, 76 with spherical surfaces, which are articulated together by an articulated coupling of known type, for example an Oldham coupling 78, which will not be described in these details for the sake of brevity.
- Two rotary output members 80, 82 are coupled for rotation with the two drive-shafts 18, 20 respectively.
- Each output member 80, 82 comprises a disc-like part 84, 86 forming an internally threaded hub 88,90 and an externally splined hub with a conical surface 92, 94 facing the respective drive-shaft 18, 20.
- each rotary output member 80, 82 has an external ring gear 96, 98 with barrel-shaped teeth which meshes with the internal gear 62, 64 of the respective intermediate rotary member 44, 46 in such a way as to define a respective second coupling 100, 102 with barrel-shaped teeth.
- gears 36, 54, 62 and 96 on the one hand, and the gears 38, 56, 64 and 98 on the other hand, that is, the first and second couplings 58, 100 and 60, 102 with barrel-shaped teeth, are arranged concentrically on 0 and 0 respectively.
- each rotary output member 80, 82 is coupled axially to the corresponding intermediate rotary member 44, 46 by means of a respective ring centred on 0, 0 and formed by a respective series of angularly spaced-apart, elastically yielding restraining units 104, 106.
- the unit 104 illustrated in Figure 3 comprises a tubular guide element 108 inserted slidably in an axial hole 110 formed in the output member 80 between the external hub part 92 and the ring gear 96.
- the hole 110 has an intermediate part of larger diameter 112 with which an external annular rebate 114 of the guide element 108 corresponds.
- a helical compression spring 116 which coaxially surrounds the guide element 114 is inserted in the part 112 and its ends bear against washers 118, 120 the radially internal portions of which bear against the guide element 114 and the radially external portions of which bear against the ends of the widened part 112 of the hole 110 on the output member 80.
- the spring 116 biasses the tubular guide element 108 into a centered position relative to a diametral median plane of the hole 110.
- each push rod 112,124 is formed by telescopically-engaged external and internal parts, 126, 130 and 128, 132 respectively, having ends with spherical surfaces 134,136 and 138, 140 arranged in sliding contact with corresponding bearing members with spherical surfaces 142,144 and 146, 148 carried respectively by the intermediate rotary member 44 and the tubular guide element 108.
- the bearing elements 142 and 144 are carried respectively by the annular element 66 and by the disc-like part 47 of the intermediate rotary member 44, while the elements 146 and 148 are fitted in correspondence with the central part of the cavity in the guide element 108.
- the spherical bearing surfaces 134,138 and 136, 140 of the push rods 122 and 124 are concave, while the complementary spherical bearing surfaces of the elements 142, 144 and 146, 148 are convex.
- the correct contact pressure between these surfaces is ensured by means of compression springs 150, 152 interposed axially between the parts 126, 128 and 130, 132 of the two push rods 122 and 124.
- each of the drive shafts 18, 20 has, at its end 18a, 20a within the casing 28, a splined end part with a conical surface 154,156 engaged in the splined hub 92,94 of the respective output member 80, 82.
- the ends 18a, 20a are hollow and house respective axial screws 158, 160 which are screwed into the internal hubs 88, 90 and urge the ends 18a, 20a towards the disc-like parts 84, 86 of the output members 80, 82 through resilient members 162, 164.
- the opposite ends of the drive-shafts 18, 20 are connected to the driving axles 14, 16 through two conventional connections including toothed couplings, not illustrated.
- the couplings 58, 100 and 60, 102 with barrel-shaped teeth each constitute a double coupling with barrel-shaped teeth for the transmission of drive from the drive motor 22 to the respective driving axle 14, 16, thus allowing the necessary angular and axial movement between these axles and the motor supported by the body 12 of the vehicle.
- Figure 4 illustrates the system in static conditions, or in the configuration in which the axis H of the drive-shaft 18 or the output member 80 is aligned with the axis B of the input member 32.
- the contact points P 1 between the gears 36 and 54 of the first connection 58 and p 2 between the gears 62 and 96 of the second connection 100 are arranged on a common plane passing through the centre 0 and perpendicular to the axis B.
- the respective lateral stop surfaces 40 and 70 of the input member 32 and the intermediate member 44 are spaced from each other.
- FIG. 7 and 8 This configuration is illustrated in Figures 7 and 8, in which the respective drive motors are indicated 22, 23 and drive the shaft 18 and the shaft 20 respectively through a single central unit 25.
- the unit 25 is substantially similar to the unit 24 described above, and differs therefrom only in that the input member 32 is divided and is thus constituted by two separate internal ring gears each actuated by a respective motor 22, 23.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Gear Transmission (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
- The present invention relates generally to railway vehicles with motor-bogies with a pair of spaced-apart driving axles rotated by at least one drive motor through transmission means between the drive motor and each driving axle, wherein said at least one motor is supported in such a way that it is not coupled to the bogie.
- A transmission system of the above-mentioned type is known generally from US-A-3408954.
- In particular, the invention concerns railway vehicles of the type defined above, in which the or each drive motor is supported by the body of the vehicle and is therefore independent of and not coupled to the respective bogie.
- Similar vehicles, some of which are already in service, like the T.G.V. in France and the Pen- dolino in Italy, and some of which are still at the design stage, find application in high-speed railway transport systems. In fact, the removal of the weight of the drive motors from bogies, and thus the lightening effect thereof, allows particularly advantageous results to be achieved from the point of view of stability and safety in operation, as well as from that of low "rail aggressiveness".
- It is clear that these solutions necessitate the use of transmission members between the drive motors and the driving axles, which should be capable of ensuring the necessary relative movements between these elements, without of course involving any weight increase such as to adversely affect the motion of the bogies.
- Until now, the solutions proposed for these transmission members have shown themselves to be poorly functional from this point of view, involving certain limitations as regards the degree of relative movement between the motors and axles, as well as problems of lubricating and difficulties in servicing the transmissions and the motors.
- The object of the present invention is precisely that of avoiding these disadvantages, by providing a transmission system for railway vehicles of the type defined initially, which is capable of ensuring a noticeably greater degree of relative movement between the motors and axles compared to conventional transmission means, ensuring at the same time a drastic reduction in the weight which affects the motion of the bogies and a significant facilitation of the installation of the motors and the changing of the gear ratios.
- According to the invention, this object is achieved by means of a transmission system for motor-bogies of railway vehicles such as defined in the characterizing portion of claim 1.
- The transmission system according to the invention is capable of allowing angles and relative movements of a significant degree between the axles and motor, and permits the following important advantages to be achieved compared with conventional solutions:
- a drastic reduction in the weight which affects the motion of the bogie;
- an increase in the moment of inertia of the body of the vehicle and thus a reduction in the frequency of all motions thereof;
- ease of installation of motors with very varied characteristics (particularly fast and powerful motors);
- ease of lubrication;
- ease of changing of the gear ratio and therefore the type of service of the vehicle.
- Moreover, the parasitic motions characteristic of bogies (second vertical frequency, pitching, and transverse and longitudinal rolling) involve noticeably reduced masses and therefore lose importance to the effects of all the trouble and stresses that they cause. These parasitic motions do not, on the other hand, have any effect on the transmission system.
- In short, the transmission system according to the invention gives the bogie in which it is used considerable stability, above all laterally, at the same time reducing the "rail aggressiveness" of the vehicle.
- The invention will now be described in detail with reference to the appended drawings, provided purely by way of a non-limiting example, in which:
- Figure 1 is a schematic view of a motor-bogie of a railway vehicle, provided with a transmission system according to the invention,
- Figure 2 is a vertical sectional view of the transmission system according to the invention,
- Figure 3 shows a detail of Figure 2 in section and on an enlarged scale,
- Figure 4, 5 and 6 are three diagrams which illustrate schematically a part of the transmission system in three different operating conditions,
- Figure 7 illustrates a variant of Figure 1, and
- Figure 8 is a plan view of Figure 7 from above.
- Referring initially to Figure 1, by 10 is schematically indicated a motor-bogie of an electric locomotive, the body of which is partially indicated 12.
- In known manner, the structure of the
bogie 10 supports a pair of spaced-apart axles comprisingrespective driving axles electric drive motor 22 through two drive-shafts motor 22 is supported by thebody 12 and is therefore not coupled to thebogie 10, and drives the two drive-shafts - Referring now in greater detail to Figure 2, the
transmission system 24 comprises acoupling 26 contained in alubricating casing 28 out of which the two drive-shafts gear wheel 30 forming part of a reduction gear incorporated in thecasing 28 and driven by the shaft of thedrive motor 22. The axis of rotation of thewheel 30 is parallel to the longitudinal axis L of thebogie 10. - The
coupling 26 includes anannular input member 32 supported rotatably by thecasing 28 about an axis B parallel to the axis of rotation A of thetoothed wheel 30 by means ofrolling bearings 29. Theinput member 32 has anexternal ring gear 34 meshing with thegear wheel 30, and a pair of axially spacedinternal gears teeth input member 32, is defined a lateralannular stop surface - Two intermediate
rotary members 44, 46, each comprise a disc-like part 47, 48 carrying anannular part internal gear input member 32. - Each
annular part external ring gear internal gears input member 32 in such a way as to define a respectivefirst coupling - Each
annular element internal gear respective disc 47, 48, with anannular member respective stops stop surfaces - The
disc parts 47 and 48 of the tworotary input members 44 and 46 havecentral coupling parts 74, 76 with spherical surfaces, which are articulated together by an articulated coupling of known type, for example an Oldham coupling 78, which will not be described in these details for the sake of brevity. - Two
rotary output members 80, 82 are coupled for rotation with the two drive-shafts - Each
output member 80, 82 comprises a disc-like part 84, 86 forming an internally threadedhub conical surface shaft - In addition, each
rotary output member 80, 82 has anexternal ring gear 96, 98 with barrel-shaped teeth which meshes with theinternal gear rotary member 44, 46 in such a way as to define a respectivesecond coupling - It should be noted that the
gears gears second couplings - While, as stated above, the
rotary input member 32 and each intermediaterotary member 44, 46 are provided with respective lateral stop means 40, 70 and 42, 72, eachrotary output member 80, 82 is coupled axially to the corresponding intermediaterotary member 44, 46 by means of a respective ring centred on 0, 0 and formed by a respective series of angularly spaced-apart, elastically yieldingrestraining units - With reference to Figure 3, one of the
units 104 will now be described in detail, it being borne in mind that theother units 104 and theunits 106 are absolutely identical. - The
unit 104 illustrated in Figure 3 comprises atubular guide element 108 inserted slidably in anaxial hole 110 formed in theoutput member 80 between theexternal hub part 92 and thering gear 96. Thehole 110 has an intermediate part oflarger diameter 112 with which an external annular rebate 114 of theguide element 108 corresponds. Ahelical compression spring 116 which coaxially surrounds the guide element 114 is inserted in thepart 112 and its ends bear againstwashers part 112 of thehole 110 on theoutput member 80. Clearly, thespring 116 biasses thetubular guide element 108 into a centered position relative to a diametral median plane of thehole 110. - Two axially opposing push rods, indicated 122 and 124, bear in an articulated manner internally against the
guide element 108 and externally against the intermediaterotary member 44, in such a way as to permit relative sliding movements between the guide element 114 and theoutput member 80 against the action of thespring 116. In effect, each push rod 112,124 is formed by telescopically-engaged external and internal parts, 126, 130 and 128, 132 respectively, having ends with spherical surfaces 134,136 and 138, 140 arranged in sliding contact with corresponding bearing members with spherical surfaces 142,144 and 146, 148 carried respectively by the intermediaterotary member 44 and thetubular guide element 108. In effect, thebearing elements annular element 66 and by the disc-like part 47 of the intermediaterotary member 44, while theelements guide element 108. - As is evident from Figure 3, the spherical bearing surfaces 134,138 and 136, 140 of the
push rods elements compression springs 150, 152 interposed axially between theparts push rods - Returning now to Figure 2, each of the
drive shafts end 18a, 20a within thecasing 28, a splined end part with a conical surface 154,156 engaged in thesplined hub respective output member 80, 82. Theends 18a, 20a are hollow and house respectiveaxial screws internal hubs ends 18a, 20a towards the disc-like parts 84, 86 of theoutput members 80, 82 through resilient members 162, 164. - The opposite ends of the drive-
shafts driving axles - It will be evident from the foregoing that the
couplings drive motor 22 to the respective drivingaxle body 12 of the vehicle. - The functioning of the
transmission system 24 is illustrated in the diagrams of Figures 4 to 6, in which, for simplicity, only the double coupling with barrel-shaped teeth associated with drive-shaft 18 has been shown schematically. In effect, the functioning of the other coupling with barrel-shaped teeth associated with the drive-shaft 20 is exactly the same. - Figure 4 illustrates the system in static conditions, or in the configuration in which the axis H of the drive-
shaft 18 or theoutput member 80 is aligned with the axis B of theinput member 32. Under such conditions, the contact points P1 between thegears first connection 58 and p2 between thegears second connection 100 are arranged on a common plane passing through thecentre 0 and perpendicular to the axis B. In this position, the respectivelateral stop surfaces input member 32 and theintermediate member 44 are spaced from each other. - Small relative dynamic movements between the
driveshaft 18 or theoutput member 80 and theinput member 32 about the centre ofrotation 0 are allowed by thetoothed coupling 58 between therespective gears input member 32 and theintermediate member 44. In fact, during these small movements theoutput member 80 and theintermediate member 44 move together about the centre ofrotation 0, since thesprings 116 of therestraining members 104 stay in an undeformed condition. The plane passing through the contact points P1 between thegears gears connections respective surfaces intermediate member 44 and theinput member 32. - Further angular movements of the axis H relative to the axis B from this configuration are permitted by virtue of the relative movements between the
output member 80 and theintermediate member 44 rendered possible by therestraining members 104. In fact, when the angle of the axis H relative to the axis B tends to exceed the value of the angle X, theintermediate member 44 is maintained in the stop position of abutment between thesurface 70 and thesurface 40, while thesprings 116 of the restrainingmembers 104 are compressed in the manner illustrated in Figure 6, and consequently theoutput member 80 slides relative to theguide elements 108. As a result of this, while the plane passing through the contact points P1 between thegears connection 58 is kept inclined to the axis B at the angle X, the plane passing through the contact points P2 between thegears connection 100 can turn about the centre ofrotation 0 until it is disposed at an angle with a value Y noticeably greater than X. - It is clear that the value of the angle Y corresponds to the maximum angle in operation between the mechanical members connected by the transmission system.
- It should be noted that the invention could also be applied to the case of a twin-motor-bogie provided with an independent motor for each of the driving
axles - This configuration is illustrated in Figures 7 and 8, in which the respective drive motors are indicated 22, 23 and drive the
shaft 18 and theshaft 20 respectively through a singlecentral unit 25. In this case, theunit 25 is substantially similar to theunit 24 described above, and differs therefrom only in that theinput member 32 is divided and is thus constituted by two separate internal ring gears each actuated by arespective motor
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85830058T ATE53968T1 (en) | 1984-05-29 | 1985-03-06 | POWER TRANSMISSION SYSTEM FOR MOTOR BOGIES OF RAILWAY VEHICLES AND VEHICLES EQUIPPED WITH THEM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT6754684 | 1984-05-29 | ||
IT67546/84A IT1179695B (en) | 1984-05-29 | 1984-05-29 | TRANSMISSION DEVICE FOR ENGINE TROLLEYS OF RAILWAY VEHICLES AND RAILWAY VEHICLE USING SUCH TRANSMISSION DEVICE |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0163612A2 EP0163612A2 (en) | 1985-12-04 |
EP0163612A3 EP0163612A3 (en) | 1987-10-14 |
EP0163612B1 true EP0163612B1 (en) | 1990-06-20 |
Family
ID=11303331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85830058A Expired - Lifetime EP0163612B1 (en) | 1984-05-29 | 1985-03-06 | Transmission system for motor-bogies of railway vehicles, and railway vehicles using this transmission system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0163612B1 (en) |
AT (1) | ATE53968T1 (en) |
DE (1) | DE3578326D1 (en) |
IT (1) | IT1179695B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE227221T1 (en) | 1997-05-09 | 2002-11-15 | Siemens Ag | DRIVE UNIT FOR RAIL VEHICLES |
DE19719746C1 (en) * | 1997-05-09 | 1998-08-20 | Siemens Ag | Rail vehicle drive unit |
DE19739127A1 (en) * | 1997-09-06 | 1999-03-11 | Zahnradfabrik Friedrichshafen | Rail vehicle gear mechanism |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3408954A (en) * | 1965-02-16 | 1968-11-05 | Rheinstahl Henschel Ag | Driving mechanism for a railway truck |
US3673814A (en) * | 1970-11-16 | 1972-07-04 | Koppers Co Inc | Gear type coupling |
DE2936732C2 (en) * | 1979-09-07 | 1982-03-04 | Siemens AG, 1000 Berlin und 8000 München | Rail-bound electric locomotive |
-
1984
- 1984-05-29 IT IT67546/84A patent/IT1179695B/en active
-
1985
- 1985-03-06 AT AT85830058T patent/ATE53968T1/en not_active IP Right Cessation
- 1985-03-06 EP EP85830058A patent/EP0163612B1/en not_active Expired - Lifetime
- 1985-03-06 DE DE8585830058T patent/DE3578326D1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
IT8467546A1 (en) | 1985-11-29 |
DE3578326D1 (en) | 1990-07-26 |
EP0163612A2 (en) | 1985-12-04 |
ATE53968T1 (en) | 1990-07-15 |
EP0163612A3 (en) | 1987-10-14 |
IT8467546A0 (en) | 1984-05-29 |
IT1179695B (en) | 1987-09-16 |
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