BOGIE FOR A RAIL VEHICLE AND RAIL VEHICLE CARRIAGE HAVING AT LEAST ONE BOGIE, RAIL VEHICLE HAVING A LEAST ONE RAIL VEHICLE CARRIAGE, AND METHOD FOR ADJUSTING THE HEIGHT OF A CARRIAGE BODY OF A RAIL VEHICLE CARRIAGE

Abstract

A chassis (100), in particular a low-floor chassis, for a rail vehicle, in particular for a tram-way. The chassis (100) comprises at least four wheels (4) each having a wheel bearing, at least two wheel axles for suspending the wheels (4), a chassis frame (1) and a primary suspension for suspending the wheels (4) relative to the chassis frame (1). The primary suspension has at least four torsion bars (20). Two torsion bars (20) each, in particular two torsion bars on one side of the chassis, are connected via a connecting element (21) in such a way that the torque of the torsion bars (20) oppose each other, in particular the torques essentially cancel each other out.

Claims

1-20. (canceled)

21. A chassis, for a rail vehicle, comprising: at least four wheels each comprising a wheel bearing, at least two wheel axles for suspending the wheels, a chassis frame, and a primary suspension for suspending the wheels relative to the chassis frame, and the primary suspension comprises at least four torsion bars each torsion bar being extended along a geometrical bar axis, wherein the chassis comprises at least two connecting elements, in each case two torsion bars are connected, via a connecting element, in such a way that torque from of the torsion bars are counter-rotational.

22. The chassis according to claim 21, wherein the chassis comprises four rockers, and each rocker is mounted on the chassis frame via a respective torsion bar.

23. The chassis according claims 21, wherein the torsion bars are movably mounted on the chassis frame,

24. The chassis according to claim 21, wherein the chassis comprises a chassis frame, at least one portal axles and at least one damping system for damping movements between the chassis frame and the wheel axle, the damping system comprises at least one damping element and at least one motion transmission element for transmitting a vertical deflection movement of the chassis frame, the motion transmission element is arranged with one end at a motion transmission point on the portal axle, and the damping element is arranged between the portal axle and the chassis frame and with one end on the portal axle at a damping connection point.

25. The chassis according to claim 21, wherein the chassis comprises at least two support elements for direct connection to a car body.

26. The chassis according to claim 21, wherein the chassis comprises at least two spring elements for roll stiffening.

27. A chassis for a rail vehicle comprising: a chassis frame, four wheels each with a wheel bearing, and four rockers, wherein at least one rocker connects a wheel axle to a drive axle, the wheels each comprise an inner and an outer side, the chassis comprises an inner region between the inner sides of the wheels and an outer region outside the inner side of the wheels, each of the rockers are arranged in the outer region of the chassis, each wheel is mounted, via a wheel axle, in at least one wheel bearing in each case, a wheel bearing is arranged in or on the respective rocker, and at least one wheel bearing is simultaneously the transmission bearing.

28. The chassis according to claim 27, wherein, in each case, the wheels are mounted exclusively via a rocker and a torsion bar.

29. The chassis according to claim 22, wherein the chassis comprises at least one stiffening element, for stiffening against a rotational movement of the rockers, each rocker comprises an extension element for extending the rocker, the extension elements of the rockers of one chassis side is connected or connectable, via a respective stiffening element, so that rotary movements of the rockers, about a geometric wheel axle, can be at least partially sprung, the connection between the stiffening element and the rockers comprising a distance in each case, so that the rotary movements of the rockers about the geometric wheel axles can be sprung by the stiffening element only from a predetermined load on the chassis.

30. The chassis according to claim 29, further comprising at least one transmission, and each transmission is arranged on a respective rocker.

31. The chassis according to claim 21, wherein the chassis comprises adjusting means for adjusting a distance between the wheel axle and the chassis frame.

32. The chassis according to claim 31, wherein the rockers are designed as two parts and a first part is variable in position relative to a second part, the first part comprises the bearing connected to the chassis frame and the second part comprises the bearing connected to the wheel.

33. The chassis according to claim 31, wherein the position of the torsion bars is adjustable by the adjusting means.

34. The chassis according to claim 21, wherein the chassis comprises at least one motor, and the at least one motor is arranged in the inner region.

35. The chassis according to claim 34, wherein the chassis comprises at least two motors and each of the at least two motors can be connected or are connected to a clutch.

36. The chassis for a rail vehicle, according to claim 22, wherein the chassis comprises at least one magnetic rail brake, and the at least one magnetic rail brake is attached to the rocker.

37. A rail vehicle car, wherein the rail vehicle car comprises a car body and at least one chassis according to claim 21.

38. A rail vehicle, wherein the rail vehicle comprises at least one rail vehicle car according to claim 37.

39. A method for height adjustment of a car body of a rail vehicle car wherein a position of rockers and/or parts of rockers, relative to a chassis frame, is changed by adjusting means so that a vertical distance, between wheel axles and the chassis frame, is changed.

40. A method for height adjustment of a car body of a rail vehicle car wherein a position of a primary suspension of the chassis is changed so that a vertical distance between the wheel axle and the chassis frame is altered.

Description

[0103] The invention is explained by way of example with reference to the following figures. It shows

[0104] FIG. 1: A chassis in perspective view

[0105] FIG. 2: A side view of the chassis from FIG. 1

[0106] FIG. 3: A top view of the chassis from FIG. 1

[0107] FIG. 4: Schematic view of a connecting element with an adjustment device

[0108] FIG. 5: Schematic side view of an alternative adjustment device

[0109] FIG. 6: Schematic side view of an attachment of a magnetic rail brake

[0110] FIGS. 7a and 7b: Schematic views of a roll stiffener of the chassis

[0111] FIG. 8: Top view of one side of the chassis

[0112] FIGS. 9a and 9b: Schematic view of a rail vehicle with chassis

[0113] FIGS. 10a and 10b: Part of a sectional view of a chassis with damping system and schematic view of a damping system

[0114] FIG. 11: Part of a sectional view through a stiffening element in longitudinal direction

[0115] FIGS. 12a and 12b: Section through a stiffening element in longitudinal direction

[0116] FIG. 1 shows a chassis 100 in perspective view. The chassis 100 comprises a chassis frame 1 on which four wheels 4 are mounted via a rocker 22 and a torsion bar 20 in each case. The torsion bars 20 thus form the primary suspension of the chassis 100. The wheel axles 25 are mounted on wheel bearings (indicated schematically by 24). The wheel bearings 24 are each arranged in a rocker 22. Two wheels are each connected by a portal axle 8. Also connected to the chassis frame 1 are secondary suspensions not shown, dampers not shown and two support elements 12 for mounting a car body 61 (see FIG. 7b). Furthermore, the chassis 100 comprises four brakes 42 (cf. FIG. 3). In addition, the chassis 100 may comprise magnetic rail brakes 40 (cf. FIG. 6). In the direction of travel, the chassis 100 comprises a left chassis side and a right chassis side. The chassis sides are substantially mirror images of each other.

[0117] The chassis frame 1 is substantially box-shaped and divided into three compartments. The chassis frame 1 may be made of mild steel or cast iron.

[0118] The wheels 4 comprise an inner side on the side of the inner wheel end face 5, and an outer side on the side of the outer wheel end face 6. Between the inner wheel end faces 5 of the wheels 4 lies the inner area of the chassis 100, and outside lies the outer area of the chassis 100. The rockers 22 are arranged in the outer area. One rocker 22 is arranged per wheel 4.

[0119] Two torsion bars 20 on each side of the chassis are connected to each other by a connecting element 21 so that the torques acting on the torsion bars 20 via the rockers 22 when the chassis 100 is loaded vertically are in opposite directions. As a result, the torques at least partially cancel each other out and the forces introduced into the chassis frame 1 are smaller than in conventional chassis. The rockers 22 and thus the wheels 4 are mounted only on the chassis frame 1; there is no further support, e.g. with coil springs, against the chassis frame 1 or a car body, as was previously the case.

[0120] FIG. 2 shows a side view of a chassis 100. The rockers 22 are mounted on the chassis frame 1 via the torsion bars 20. The wheel axles 25 are mounted on the rockers 22 via the wheel bearings 24 (see FIG. 1).

[0121] The rockers 22 are made in two parts. Each rocker 22 comprises a first part 22a and a second part 22b. The first part 22a comprises the frame-side rocker bearing and the second part 22b comprises the wheel-side rocker bearing.

[0122] FIG. 3 shows a top view of the chassis 100. FIG. 3 also shows a section through a torsion bar bearing 20 and through a portion of a rocker 22.

[0123] The four torsion bars 20 and the two connecting elements 21 as well as a bearing element 12 designed as a slewing ring segment can be seen. An alternative bearing element 12′ in the design as a single roller mounted in the chassis is shown dashed. Multiple rollers 12′ may also be provided on each side of the chassis. Of course, the analogous bearing element is also formed on the opposite side of the chassis, but it is not shown here.

[0124] Two torsion bars 20 are connected to each other via a connecting element 21 in such a way that the torques in the connecting element 21 are in opposite directions. Thus, mainly vertical, transverse and longitudinal forces act on the chassis frame 1. Moments that occur during deflection of the torsion bars 20 are not introduced into the chassis frame 1, or only to a small extent.

[0125] The torsion bars 20 and the connecting element 21 are part of the primary suspension. In a sectional view, the bearing of a torsion bar 20 can be seen. The torsion bar 20 is mounted in the chassis frame 1 via an elatic bearing 23. The elatic bearing 23 permits axial and radial displacement of the torsion bar 20 of +/−5 mm and also permits limited rotation of the torsion bar 20. The other torsion bars 20 are also mounted via such an elatic bearing 23 (not shown here).

[0126] Further shown in a partial section is a rocker 22 in which a transmission 30 is arranged. The output gear of the transmission 30 is mounted on the wheel axle 25. Each wheel bearing 24 is also a transmission bearing (not shown here). Thus, wheel axle 25 is also the transmission output shaft and is supported by wheel bearings 24.

[0127] Two brakes 42 are arranged on each wheel axle 25 and attached to the rocker 22 and act on the wheel axles 25.

[0128] The support element 12 is arranged on the chassis frame 1 between the running surfaces 7 of the wheels 4 lying one behind the other in the direction of travel and can be connected directly to the car body 61 of a rail vehicle car 62; 63 (cf. FIGS. 9a and 9b). A support element 12 comprises a part-circular guide segment bent in the direction of the outer area.

[0129] Further shown are four motors 10 connected to the chassis frame 1. The motors 10 are arranged on the inside of the chassis 100 and are attached to the outer surfaces 2 of the chassis frame 1 facing in and against the direction of travel. The geometric motor axes are thereby substantially parallel to the outer surfaces 2. The motors 10 with motor housing have a cross-sectional diameter of less than 200 mm and a power of 50 kW, 10-12 kU/min at 80 km/h. The gear ratio is approximately 14:1. The motors 10 each drive the wheels 4 of the chassis 100 via a transmission 30.

[0130] The connecting element 21 includes a bridge 30 and an adjusting device. A partial section of the chassis frame 1 and two torsion bars 20 connected via the bridge 30 are shown. The adjustment device is arranged on the torsion bars 20. The adjustment device comprises adjustment means, in this case eccentrics 32 and two levers 31. On the bridge 30, eccentrics 32 and one lever 31 each, which is connected to a torsion bar in a rotationally fixed manner, are arranged. The torsion bars 20 are rotatably mounted in the bridge 30. The adjustment device is ultimately used to change the height of the car body above the top of the rail: When eccentrics 32 are rotated, levers 31 are moved and the angular positions of torsion bars 20 are changed relative to each other and relative to the chassis frame 1. This changes the position of the rockers 22 (cf. FIG. 1) and thus the height of the body support above the top of the rail. The levers 31 are designed to absorb the moments generated during the transmission. In particular, the levers 31 are therefore of more solid construction than shown. FIG. 5 shows a schematic side view of an alternative adjustment device.

[0131] Here, the adjusting device comprises a rocker 22, adjusting elements 34 and latching elements 35. The rocker 22 is divided into a frame portion 22a on the chassis frame side and a wheel portion 22b on the wheel side. Adjusting elements 34 and latching elements 35 are arranged on the rocker 22. The positions of frame portion 22a and wheel portion 22b can be adjusted relative to one another and fixed in various positions by adjusting elements 34 and latching elements 35. The adjusting elements 34 here comprise elongated holes and screws. The latching elements 35 are in the form of a latching lug and a mating latching piece attached to the wheel portion 22b. The mating detent piece has a fixed detent position. The adjustment can be made either by loosening the adjusting elements 34 and moving the frame portion 22a and the wheel portion 22b towards each other and/or by inserting a mating latching piece with a different latching position or by changing the position of the mating latching piece.

[0132] FIG. 6 shows a schematic side view of a magnetic rail brake 40. With extended lines the position of wheel 4, rocker 22 and chassis frame 1 in a first loading condition is shown. The indicated dashed lines show the position of the components in a second loading condition, in which the chassis frame 1 is deflected by the vertical frame displacement z.

[0133] The magnetic rail brake 40 includes a brake shoe 43, a cable 41 and a pulley Ro. The cable 41 is attached at one end to the brake shoe 43 at brake attachment point B and at the other end to the chassis frame 1 at frame attachment point C. The geometric wheel axle H is arranged from the geometric swing arm axis A in a horizontal swing arm length a. The pulley Ro is arranged a horizontal swing arm length c away from the geometric swing arm axis A. In a first cable section, the cable 41 leads vertically from the brake attachment point B to a deflection pulley Ro attached to the rocker 22. In a second cable section, the cable 41 leads away from the deflection pulley Ro at an angle α from the first cable section to the frame attachment point C on the chassis frame 1. The second cable section has the initial length so in the unsprung position and the length s1 in the sprung position.

[0134] In the deflected state, the position of the geometric swingarm axis A shifts from the initial position Ao to the deflected position A1:

[0135] Under the vertical deflection of the chassis frame 1, the vertical frame displacement z, the rocker 22 rotates about the geometric rocker axis A in the initial position Ao to the deflected position A1. The deflection roller Ro moves to the position R1, resulting in the vertical roller displacement zR. A horizontal distance c between the deflection roller Ro and the geometric swing arm axis A of c=⅔ of the swing arm length a results in a vertical roller displacement zR≈⅓ z. The angle α of the second rope section is now selected in such a way that the change in length s=s1−so in the rope section between the deflection roller Ro and frame attachment point C caused by the vertical deflection is equal to the roller displacement zR. This means that the height of the brake shoe 43 (at brake attachment point B) remains constant relative to the upper edge of the rail even when the vehicle is deflected in or out. With the dimensions shown, this is achieved with an angular position of the rope section between the deflection pulley Ro and frame attachment point C of α≈60° to the vertical.

[0136] FIGS. 7a and 7b show schematic views of a roll stiffener of the chassis frame 100: FIG. 7a shows a sectional view through the chassis frame 1 in the direction of travel, FIG. 7b shows a sectional view through a rail vehicle car 62; 63 transverse to the direction of travel (cf. FIGS. 9a and 9b). The solid lines show the position of the wheels 4, rockers 22, torsion bars 20, the chassis frame 1 and the car body 61 in a first state. The dashed lines show the position of these elements in a tilted position of the car body 61.

[0137] FIG. 7a shows two torsion bars 20, a connecting element 21 and two spring elements 50. The torsion bars 20 are connected via a connecting element 21 and connected to the chassis frame 1 via elatic bearings 23 (see FIG. 3). The spring elements 50 are arranged between the chassis frame 1 and the connecting element 21. One spring element 50 each is arranged above and below the connecting element 21 in a driving position of the rail vehicle and is connected to the chassis frame 1.

[0138] FIG. 7b shows a car body 61, two wheels 4, the secondary suspension 3, two torsion bars 20 and four spring elements 50.

[0139] The car body 61 is connected to the chassis frame 1 via the secondary suspension 3. The wheels 4 are mounted on the chassis frame 1 via rockers 22 and torsion bars 20.

[0140] If the car body 61 tilts to the side, i.e. if the car body 61 sways, the tilting forces are transmitted to the chassis frame 1 via the secondary suspension 3, so that the chassis frame 1 is also tilted.

[0141] The tilting movement is transmitted from the chassis frame 1 to the fe-der elements 50, whereby they at least partially absorb the tilting movement. The chassis frame 1 is therefore partially supported on the connecting elements 21 by the spring elements 50.

[0142] The moment effective in the primary suspension as a result of centrifugal force leads to deflection of the rockers 22 on the side of the chassis outside the curve (here the right-hand side in the figure). On the side on the inside of the curve, there is a corresponding deflection. This inward and outward deflection of the rockers 22 leads to a corresponding rolling motion of the chassis frame 1, since the latter is mounted only at the rocker-side ends of the torsion bars 20. Since in each case one torsion bar 20 is firmly connected to the rocker 22 and the rocker 22 is mounted directly on the wheel axle 25, the torsion bars 20 and wheel axles 25 form a torsionally rigid unit as seen in the direction of travel (cf. FIG. 3). This means that the torsion bars 20 always remain parallel to the wheel axles 25, i.e. parallel to the rail plane, even when the primary suspension springs in and out (cf. FIG. 3). Left-hand and right-hand torsion bars 20 therefore remain parallel to one another and perform up and down movements within the chassis frame 1 under the influence of rolling (shown as dashed lines in the figure). This concept-related characteristic is used to stiffen the primary suspension during roll. In this case, the up and down movement is restricted, or made more difficult, by means of springs 50 between the torsion bar ends and the chassis frame 1. The spring elements 50 are arranged between the center of the connecting element 21 and the inner contour of the chassis frame 1. The spring elements 50 are made of rubber.

[0143] FIG. 8 shows a chassis side of a chassis 100 in a plan view and a section through a rocker 22. In a chassis 100, a mirror-inverted arrangement of the elements shown is provided.

[0144] On the right side, a wheel 4 is shown in solid lines in the normal track position. The wheel axles are interchangeable. As an alternative to a wheel axle with wheels in the normal gauge position, a wheel axle with a wheel 4′ is shown here in dashed lines in a narrow gauge position. For a standard gauge chassis, one motor 10 and one transmission 30 are provided for each wheel 4 in a chassis 100. The two motors 10 of a wheel axle, whose motor axes are aligned, are connected via a clutch 11. The clutch 11 opens depending on the speed and torque load: At low speeds, the clutch 11 is open. At high speeds, the clutch 11 is closed. At larger torque differences between the coupled parts, the clutch 11 can slip.

[0145] The torsion bars 20 are mounted in the chassis frame 1 via the elatic bearings 23 and are connected at their end located in the inner area of the chassis 100 by the connecting element 21. The connecting element 21 receives the torsion bars 20 in a rotationally fixed manner. At their other end, the torsion bars are connected in a rotationally fixed manner to the rockers 22.

[0146] For driven wheels 4, the rockers 22 each receive the transmission 30. The transmission 30 is connected to the motor 10 via the compensating clutch 31. The purpose of the clutch 31 is to compensate for the offset between the engine axis and the transmission input axis that occurs when the rockers 22 are deflected. The wheels 4 are arranged on the wheel axle 25, which is also the transmission output shaft. The rocker 22 also carries a brake 42. For a chassis 100, one brake 42 is usually arranged on each rocker 22 for each wheel 4 (see FIG. 3). The brake 42 is arranged on the rocker 22 and acts directly on the wheel axle 25. The wheel axle 25 is mounted directly in the rocker 22 by means of wheel bearings 24 and is not further supported relative to the chassis frame 1.

[0147] The secondary suspension 3 is also shown schematically in the figure. Seen in the direction of travel, the secondary suspension 3 is arranged in the center of the chassis 100. Two secondary suspension elements 3 are arranged on each side of the chassis.

[0148] FIGS. 9a and 9b each show a rail vehicle schematically with chassis 100.

[0149] FIG. 9a shows a rail vehicle 60 consisting of three rail vehicle cars 62, each with two bogies 100 and a car body 61. These bogies 100 are designed here as bogies.

[0150] FIG. 9b shows a rail vehicle 60 comprising three rail cars 63, each with one chassis 100 and one car body 61. The chassis 100 are not designed to rotate out. Car bodies 64 are arranged between each two rail vehicle cars 63 and are supported by the rail vehicle cars 63.

[0151] FIGS. 10a and 10b show a portion of a side view of a chassis with a damping system and schematic view of a damping system. Solid lines show the situation before spring deflection. The deflected position is shown in dashed lines.

[0152] FIG. 10a shows a portion of a sectional view through a chassis 100 in the direction of travel. A damping system is shown. The damping system comprises a damping element 13, a portal axle 9, a chassis frame 1 and a transmission element 14.

[0153] The portal axle 9 has a side part 15 at one end, which is rotatably mounted on the rocker 22 about the geometric wheel axis V. The portal axle 9 also includes a bridge girder 16 connected to the side part 15.

[0154] The damping element 13 is arranged between the chassis frame 1 and the bridge girder 16 and has a substantially horizontal damping direction in the direction of travel. The stroke of the damping element 13 can be varied by the position of the bridge girder 16.

[0155] One end of the transmission element 14 is rotatably connected to the chassis frame 1. The other end of the motion transmission element 14 is rotatably connected at the motion transmission point P to the side part 15. The motion transmission point P is arranged at a link distance L from the geometric wheel axle V. The damping connection point Q is arranged at a vertical distance m from the geometric wheel axle V.

[0156] When the primary suspension compresses, the chassis frame 1 moves by the vertical frame displacement z. The connection point of the motion transmission element 14 to the chassis frame 1 is displaced by this movement. The motion transmission element 14 in turn transmits this motion to the side part 15, so that the motion transmission point P and thus the side part 15 and the bridge girder 16 are pivoted about the geometric wheel axle V at an angle β. Here, tan β≈z/L applies. The deflection of the bridge girder 16 at the damping connection point Q is approximately u≈m/L*z for small z and thus small β. The deflection of the portal axle 9 is therefore greater than the deflection if the geometry is selected appropriately.

[0157] FIG. 10b shows a schematic representation of the pivoting of the portal axle 9 (cf. FIG. 10a).

[0158] FIG. 11 shows a schematic section through a part of a connection of a rocker 22 with a stiffening element 25 in a first loading condition.

[0159] The stiffening element 25 is designed here as a hollow beam. The rocker 22 includes an extension element 29 attached to the body of the rocker 22.

[0160] The extension element 29 includes a mounting body having a bearing point 29a, and a wedge body 27 having an upper contact point 27a. The attachment body and wedge body 27 are integrally formed. The wedge body 27 has a plan view which comprises a substantially buckled wedge shape.

[0161] The stiffening member 25 has a support member 26a and a support element 26b inside. The support member 26a is disposed on the upper side of the stiffening member 25 in the attached state, and the support member 26b is disposed on the lower side.

[0162] The support member 26a and the support element 26b each comprise a contact element made of polyurethane. The support member 26a has a thickness of substantially 2 mm, unlike that shown in the figure. The support element 26b, other than as shown in the figure, has a thickness that is substantially 7-9 mm.

[0163] In this first loading condition, the stiffening element 25 rests with the support members 26a on the extension element 29. There is a distance between the extension element 29 and the support element 26b.

[0164] When the primary suspension is compressed compared to the condition shown in the figure, the extension element 29 rotates about the geometric axis of the support 29a. The end of the wedge body 27 with the lower contact point 27b of the extension element 29 moves downward until it meets the support element 26b. Here, the support element 26b is designed as a polyurethane contact element for both rockers 22 of a chassis side together. If the extension element 29 and thus the rocker 22 rests on the support element 26b, the extension element 29 wedges itself in the stiffening element 25. Thus, stiffening of the primary suspension takes place.

[0165] FIGS. 12 each show a section through a stiffening element 25 shown in FIG. 11 in the longitudinal direction. The rockers 22 of one side of the chassis, which are connected via the stiffening element 25, are shown in a first and a second load state.

[0166] FIG. 12a shows the loading condition already described for FIG. 11.

[0167] FIG. 12b shows a second loading condition. The load in the second loading condition is greater than the first loading condition.

[0168] The rockers 22 are rotated about the geometric axis of the bearing point 29a corresponding to the load from the original position of FIG. 12a. The load shown corresponds to the load prevailing after breakage of a torsion bar of a primary suspension. The extension elements 29 are connected to the stiffening element 25 via the support members 26a and the support element 26b. The stiffening element 25 has been elastically and plastically deformed in accordance with the rotation of the rockers 22.