FR3076792A1 - BOGIE FOR RAILWAY VEHICLE - Google Patents

Abstract

The bogie (14) for a railway vehicle comprises a chassis (16), a front axle (18a), a rear axle (18b) and, for each axle (18), at least one primary suspension device (22, 25) of the axle relative to the frame (16). The bogie (14) further comprises at least one transverse motor (24) and, for each axle (18), a respective gear (46) coupling the motor (24) to the axle (18) so that the motor ( 24) drives the axle (18) in rotation about its axis. The gear units (46) are arranged laterally on the same side of the bogie (14).

Description

The present invention relates to a bogie for a railway vehicle, of the type comprising a chassis, a front axle, a rear axle and, for each axle, at least one device for primary suspension of the axle relative to the chassis, the bogie comprising at least a transverse motor and, for each axle, a respective reduction gear coupling the motor to the axle so that the motor drives the axle in rotation about its axis.

Bogies of the aforementioned type are known. The motor reducers are each arranged on a respective side of the bogie. The torque generated by the motor is transferred to the reducers, which reduce the speed of rotation of the rotating components of the motor. The reducers then transfer the torque to the axle, thereby driving the wheels in rotation.

These bogies are not entirely satisfactory, however. They are in fact not suitable for asymmetrical compartment arrangements in which there are two seats on one side of the corridor and one seat on the other side of the corridor, as may be the case on board narrow trams or in other vehicles when the seats are wider than the usual width. The nesting of the body in the bogie, which has a symmetrical arrangement, then leads to not optimally using the space, or to providing layout quirks that can complicate the movement of people through the compartment.

An object of the invention is to obtain a better allocation of space for passengers.

To this end, the invention relates to a bogie for a rail vehicle of the aforementioned type, in which the reducers are arranged laterally on the same side of the bogie.

According to particular embodiments of the invention, the bogie also has one or more of the following characteristics, taken in isolation or according to any possible combination (s):

- each axle is rotatably mounted relative to the chassis by means of at least one axle box;

- for each axle, the respective reduction gear of said axle is integrated in an axle box of the axle;

- Each axle has two wheels, said wheels being placed transversely towards the outside of the axle with respect to the axle boxes of said axle;

- each of the primary suspension devices includes:

o an arm secured to an axle box, the arm being articulated to the chassis so as to be movable in rotation about a transverse axis of rotation relative to the chassis, and o an elastic member interposed between the arm and the chassis, away from the axis of rotation;

the bogie comprises, for each axle, a first primary suspension device disposed laterally on a first side of the chassis constituted by the side where the reducers are placed, and a second primary suspension device disposed laterally on the second side of the chassis, l 'elastic member of the first primary suspension device located above one of the reducers;

- The elastic member of the second primary suspension device is located substantially at the same height as the reducers;

- the chassis comprises at least two crosspieces;

- there are two transverse motors, a first of said transverse motors being coupled to the front axle and the second transverse motor being coupled to the rear axle;

- each transverse motor is integrated in a respective cross member among the cross members of the chassis;

- The chassis comprises two half-chassis each with at least one respective cross-member among the cross-members of the chassis, said half-chassis being articulated with respect to each other by an articulation system so as to be able to pivot one relative to each other around a substantially longitudinal axis of rotation;

- The articulation system comprises two longitudinal connecting rods, each one being articulated to each half-frame;

- each axle has two wheels, each primary suspension device being arranged transversely towards the inside of the bogie relative to the wheels of the axle that it suspends; and

- each axle has two wheels and the bogie comprises, for each axle, an axle braking member, said braking member being placed transversely towards the outside of the bogie relative to the wheels of the axle.

The invention also relates to a railway vehicle comprising at least one bogie as defined above.

Other characteristics and advantages of the invention will appear on reading the description which follows, given solely by way of example and made with reference to the appended drawings, in which:

- Figure 1 is a cross-sectional view of a rail vehicle according to the invention,

- Figure 2 is a perspective view of a bogie of the vehicle of Figure 1,

FIG. 3 is a top view of the bogie of FIG. 2,

- Figure 4 is a longitudinal sectional view of the rail vehicle of Figure

1, the view being taken along the section plane IV-IV in FIG. 1,

- Figure 5 is a bottom view of the bogie of Figure 2.

In the following description, the terms of orientation are to be understood with reference to the usual orientation mark of railway vehicles, shown in the Figures, and in which there are:

- a longitudinal axis X, oriented from rear to front,

- a transverse axis Y, oriented from right to left and defining with the longitudinal axis a horizontal plane, and

- a vertical axis Z, oriented from bottom to top.

The X, Y and Z axes together forming a direct orthogonal coordinate system, the front and rear being heard relative to the normal direction of movement of the rail vehicle.

The rail vehicle 10 shown in FIG. 1 comprises a car 12 and at least one bogie 14 mounted under the car 12.

The car 12 is elongated in a longitudinal main direction. It has an interior passenger reception area. In a variant, the car 12 has a space for containing goods.

Car 12 has an asymmetrical configuration in a plane transverse to the main direction. It has in particular two seats 15 on the first side of a corridor 17 and a single seat 15 on the other side of the corridor 17. The corridor 17 itself is offset towards the side which has fewer seats relative to the other side. In Figure 1, the corridor 17 is thus shifted to the left side.

The bogie 14 is able to support and guide the car 12 when the car 12 moves along a rail. To this end, the bogie 14 comprises, as visible in FIG. 2, a chassis 16, a front axle 18a, a rear axle 18b and, for each of the front axles 18a and rear 18b, at least one primary suspension device 22 of the axle 18a, 18b relative to the chassis 16. The bogie 14 further comprises at least one secondary suspension device 23 of said bogie 14 relative to the car 12.

The bogie 14 also comprises at least one transverse motor 24 and, for each axle 18a, 18b, two respective axle boxes 26. The bogie 14 also includes, for each axle 18a, 18b, a member 28 for braking the axle 18a, 18b.

The bogie 14 also includes two magnetic braking pads 30.

The chassis 16 comprises at least two transverse cross members 34 substantially parallel to one another.

In the example shown, the chassis 16 comprises two half-chassis 38a, 38b each comprising at least one respective cross member among the cross members 34 of the chassis 16. The two half-chassis 38a, 38b are arranged successively in the longitudinal direction X, of so that one distinguishes a front half-chassis 38a and a rear half-chassis 38b.

The half-frames 38a, 38b are articulated relative to each other by an articulation system 40 so as to be able to pivot relative to each other about an axis of rotation A - A ' substantially longitudinal.

The front axles 18a and rear 18b each extend transversely relative to the chassis 16. Advantageously, each of the front axles 18a and rear 18b is parallel to the cross members 34.

The front axles 18a and rear 18b each have two wheels, respectively 42a, 42b, spaced transversely from one another and a transverse shaft 44 connecting the two wheels 42a, 42b while being integral with said wheels 42a, 42b.

The front wheels 42a are coaxial. Likewise, the rear wheels 42b are coaxial. The front wheels 42a are spaced longitudinally from the rear wheels 42b.

The wheels 42a, 42b together define a plane P1 (FIG. 1) for the rolling of the bogie 14.

The shafts 44 are located substantially in a horizontal plane P2 (Figure 1) substantially parallel to the running plane P1. This plane is located between 200 mm and 400 mm above the running surface P1, preferably between 250 mm and 350 mm and typically worth 300 mm for wheels having their new diameters of 600 mm. The shafts 44 are advantageously parallel to the crosspieces 34.

In the example shown, the transverse motors 24a, 24b are two in number. A first of the transverse motors 24a is coupled to the front axle 18a, and the second transverse motor 24b is coupled to the rear axle 18b.

Each transverse motor 24a, 24b is rigidly fixed to the chassis 16 of the bogie 14. Advantageously, each transverse motor 24a, 24b is integrated in a respective cross-member 34 among the cross-members of the chassis 16. In particular, the first transverse motor 24a is integrated with a cross member 34 of the front half-frame 38a and the second transverse motor 24b is integrated into a cross member 34 of the rear half-frame 38b.

Each of the front 18a and rear 18b axles is rotatably mounted with respect to the chassis 16 by means of two axle boxes 26 each disposed between the wheels 42a, 42b of the axle 18a, 18b. In other words, the axle boxes 26 are placed transversely towards the inside of the axle 18a, 18b relative to the wheels 42a, 42b.

Each axle box 26 is in particular attached to a respective wheel 42a, 42b among the wheels 42a, 42b of the axle 18a, 18b, and extends only over a fraction of the transverse length of the axle shaft 44. The shaft 44 of each axle 18a, 18b thus passes through each of the axle boxes 26 and is guided in rotation inside these by bearings, for example ball bearings.

For each axle 18a, 18b, a respective reduction gear 46 couples the transverse motor 24 to the axle 18a, 18b so that the motor 24 drives the axle 18a, 18b in rotation about its axis. Advantageously, each reduction gear 46 incorporates one of the axle boxes 26 of the axle 18a, 18b.

The reduction gear 46 has an input linked in rotation to the motor shaft 24 by means of a coupling (not shown in the figures), and an output directly fixed to the axle 18a, 18b.

Each axle 18a, 18b is connected to the chassis 16 by means of at least one primary suspension device 22, 25. In the example shown, these primary suspension devices 22, 25 are two in number per axle 18a, 18b.

Advantageously, each primary suspension device 22, 25 is of the armbox type. It comprises an arm 48 secured to an axle box 26, and an elastic member 50 interposed between the arm 48 and the chassis 16.

The arm 48 is pivotally articulated to the chassis 16 around an axis of rotation B - B ’transverse relative to the chassis 16, axis materialized by two elastic joints 52.

The axis of rotation B - B 'is advantageously substantially parallel to the cross members 34, and is preferably substantially offset vertically from the plane P2.

The elastic member 50 is disposed at a distance from the axis of rotation B - B ’.

The elastic member 50 is for example a sandwich comprising a plurality of layers of elastic material and a plurality of metal plates interposed between the layers of elastic material and adhering to the elastic layers.

For each axle 18, a first primary suspension device 22 is arranged laterally on a first side of the chassis 16 consisting of the side where the reducers 46 are placed.

The elastic member 50 of the first primary suspension device 22 is disposed above the plane P2, at a distance from the plane P2 greater than 200 mm, above the reduction gear 46.

For each axle 18, a second primary suspension device 25 is arranged laterally on the second side of the chassis 16 opposite the first side of the chassis 16.

The elastic member 50 of the second primary suspension device 25 is crossed by the plane P2. In other words, it is about the same height as the axle shafts 44.

Each primary suspension device 22, 25 is arranged transversely towards the inside of the bogie 14 relative to the wheels 42 of the axle 18 which it suspends.

With reference to FIG. 4, the articulation system 40 comprises, on each side of the bogie 14, a longitudinal connecting rod 56, and in the central part an elastic articulation 58 which connects the two half chassis 38a and 38b.

Each connecting rod 56 is articulated at each of its longitudinal ends to a respective half-frame 38a, 38b. It is in particular pivotally mounted about a transverse axis (not shown) relative to each half-frame 38a, 38b.

Each connecting rod 56 is also interposed between a front wheel 42a and a rear wheel 42b while being substantially aligned longitudinally with said wheels 42a, 42b.

The elastic articulation 58 is itself formed by two arms 60 each protruding from the cross member 34 of a respective half-frame 38a, 38b, in the direction of the other half-frame 38a, 38b, and interlocking l 'in one another so as to form a pivot with a transverse axis, as visible in Figure 5.

Returning to FIGS. 2 and 3, the braking member 28 of each axle 18a, 18b is disposed on the side of the bogie 14 opposite the side where the reducers 46 are placed. It is in particular disposed towards the outside of the bogie 14 by relative to the wheels 42a, 42b of said axle 18a, 18b.

Each braking member 28 is typically constituted by a disc brake. Thus, it comprises a brake disc 64 integral in rotation with the axle 18a, 18b and at least one caliper 66 mounted on the chassis 16 suitable for pinching said disc 64.

The secondary suspension devices 23 are suitable for suspending the car 12 from the rail vehicle 10 from the bogie chassis 16. These devices 23 are, in the example shown, two in number.

Each secondary suspension device 23 is disposed longitudinally between the cross members 34 of the bogie 14, and transversely towards the inside of the bogie 14 relative to the wheels 42a, 42b of the axles 18a, 18b.

Each secondary suspension device 23 comprises two secondary elastic members 68, and a plate 70 disposed between the elastic members 68.

The secondary elastic members 68 are arranged in a chevron on either side of the plate 70. Each secondary elastic member 68 has a first end rigidly fixed to the plate 70, and a second end, opposite the first, fixed to one of the cross members 34 of chassis 16.

Each secondary elastic member 68 is typically formed by a sandwich comprising a plurality of layers of elastic material and a plurality of metal plates interposed between the layers of elastic material and adherent to the elastic layers, said layers and plates being stacked in a direction going from the first to the second end of the elastic member 68.

The plate 70 is substantially horizontal and comprises at its ends, near the elastic members 68, support zones 72 of the car 12 of the vehicle 10.

In the example shown, the secondary suspension devices 23 are arranged transversely on either side of the central plate 70 integral with said secondary suspension devices 23, said central plate 70 carrying a central pivot 74.

This central plate 70 transversely connects the two secondary suspension devices 23. It advantageously has a lower central region than the support zones 72.

The pivot 74 connects the central plate 70 to the car 12. It is fixed to the car 12 and to the central plate 70 and is adapted to allow a rotational movement of the car 12 relative to the plate 70 around a substantially vertical axis. .

The secondary suspension devices 23, in particular their secondary elastic members 68, are crossed by the plane P2. Furthermore, the distance from the top point of each support zone 72 to the plane P2 is less than the distance from the plane P2 from the top point of each first primary suspension device 22.

Finally, each magnetic brake shoe 30 is, as visible in FIG. 2, interposed between a front wheel 42a and a rear wheel 42b while being substantially aligned longitudinally with said wheels 42a, 42b. It is movable relative to the chassis 16 between a retracted position above the plane P1 and a deployed position in which it is flush or descends below the plane P1.

Each magnetic brake shoe 30 is in particular arranged below a respective connecting rod among the connecting rods 56 of the articulation system 40.

Each magnetic braking pad 30 is preferably elongated in the longitudinal direction L and is articulated by its longitudinal ends to each of the half-frames 38a, 38b, and in particular to the cross members 34.

Thanks to the invention described above, the bogie 14 is suitable for fitting asymmetrical compartments, with optimal occupancy of the space. In fact, having the reducers on the same side makes it possible to produce railway vehicles with an offset corridor without protrusions in the corridor. This allows disabled people in particular to move the wheelchairs without difficulty.

In addition, the transverse configuration of the motors 24 avoids having to have the 10 motors 24 outside the bogie 14 and therefore avoids exposing them to an unfavorable environment, for example in rain or snow.

Claims (15)

1. Bogie (14) for a rail vehicle (10), the bogie (14) comprising a chassis (16), a front axle (18a), a rear axle (18b) and, for each axle (18), at least one primary suspension device (22, 25) of the axle with respect to the chassis (16), the bogie (14) comprising at least one transverse motor (24) and, for each axle (18), a respective reduction gear (46) coupling the motor (24) to the axle (18) so that the motor (24) drives the axle (18) in rotation about its axis, characterized in that the reducers (46) are arranged laterally with a same side of the bogie (14). 2. Bogie (14) for a railway vehicle according to claim 1, in which each axle (18) is rotatably mounted relative to the chassis (16) by means of at least one axle box (26). 3. Bogie (14) for a rail vehicle according to claim 2, in which, for each axle (18), the respective reduction gear (46) of said axle (18) is integrated in an axle box (26) of the axle (18). 4. Bogie (14) for a rail vehicle according to claim 2 or 3, wherein each axle (18) comprises two wheels (42), said wheels (42) being placed transversely towards the outside of the axle (18) by relative to the axle boxes (26) of said axle (18). 5. Bogie (14) for a railway vehicle according to one of claims 2 to 4, in which each of the primary suspension devices (22, 25) comprises: o an arm (48) integral with an axle box (26), the arm (48) being articulated to the chassis (16) so as to be movable in rotation about a transverse axis of rotation relative to the chassis (16 ), and o an elastic member (50) interposed between the arm (48) and the frame (16), at a distance from the axis of rotation. 6. Bogie (14) for a rail vehicle according to claim 5 comprising, for each axle (18), a first primary suspension device (22) disposed laterally on a first side of the chassis (16) constituted by the side where are placed the reducers (46), and a second primary suspension device (25) disposed laterally on the second side of the chassis (16), the elastic member (50) of the first primary suspension device (22) being located above the 'one of the reducers (46). 7. Bogie (14) for a rail vehicle according to claim 6, in which the elastic member (50) of the second primary suspension device (25) is situated substantially at the same height as the reducers (46). 8. Bogie (14) for a railway vehicle according to any one of claims 1 to 7, in which the chassis (16) comprises at least two crosspieces (34). 9. Bogie (14) for a railway vehicle according to any one of claims 1 to 8, in which the transverse motors (24) are two in number, a first of said transverse motors (24) being coupled to the front axle ( 18a) and the second transverse motor (24) being coupled to the rear axle (18b). 10. Bogie (14) for a rail vehicle according to claims 8 and 9 taken together, wherein each transverse motor (24) is integrated in a cross member (34) respectively among the cross members (34) of the chassis (16). 11. Bogie (14) for a rail vehicle according to claim 8 or 10, in which the chassis (16) comprises two half-chassis (38) each with at least one cross member (34) respectively from among the cross members (34) of the chassis ( 16), said half-frames (34) being articulated relative to each other by an articulation system (40) so as to be able to pivot relative to each other about an axis of substantially longitudinal rotation. 12. Bogie (14) for a railway vehicle according to claim 11, in which the articulation system (40) comprises two longitudinal connecting rods (56), each being articulated to each half-frame (38). 13. Bogie (14) for a rail vehicle according to one of claims 1 to 12, wherein each axle (18) has two wheels (42), each primary suspension device (22, 25) being arranged transversely inwardly. bogie (14) relative to the wheels (42) of the axle (18) which it suspends. 14. Bogie (14) for a railway vehicle according to one of claims 1 to 13, in which each axle (18) comprises two wheels (42) and the bogie (14) comprises, for each axle (18), a member for braking (28) of the axle (18), said braking member (28) being placed transversely towards the outside of the bogie (14) relative to the wheels (42) of the axle (18). 15. Railway vehicle (10) comprising at least one bogie (14) according to any one of the preceding claims.