• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a box (1) for a railway vehicle bogie axle comprising a housing (2), a front cover (10) fixed to a front side of said housing (2), a rear cover (12) attached to a rear side of said housing (2), a cylindrical roller bearing unit (5), an end cap (7) and a bearing ring (8). A rear chamber (46) and a front chamber (39) on both axial sides of the sealed bearing unit (5) are in fluid connection through a bypass system.
    公开号:FR3060504A1
    申请号:FR1761783
    申请日:2017-12-07
    公开日:2018-06-22
    发明作者:Ludovic Fenayon；Thierry Le Moigne
    申请人:SKF AB；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION
    The present invention relates to an axle box of a bogie of a rail vehicle, in particular a 3-axle bogie model which imposes a special lateral movement of the median axle while traversing curved tracks. The invention also relates to a railway bogie equipped with such an axle box.
    BACKGROUND OF THE INVENTION
    Typically, models of railway bogies with 3 or more axles are provided with at least three pivoting axles, wheels being mounted on axial ends of said axles. Each axle end is guided in rotation by an associated axle box. Axle boxes are provided with suspension means for the bogie. At least one of said axles forms a central axle for this type of bogies.
    When a 3-axle railway bogie travels a curved track, the central axle imposes an axial displacement relative to the other two axles which are positioned in the same lateral plane in a curve. Such axial displacement is possible thanks to axle boxes supporting the central axle which are provided with a specific bearing system while being endowed with an axial floating capacity.
    It is known to equip the axle boxes supporting the central axle with cylindrical roller bearing units with an axial displacement capacity of the rollers. Such bearing units typically comprise a fixed outer ring fixed to an axle box casing, said casing being fixed to the bogie, a rotating inner ring fixed to the axle, and cylindrical rollers housed radially between said inner and outer rings. . A raceway for the rollers is defined in an annular groove made in the cylindrical bore of the outer ring, said rollers being locked axially inside the shoulders of said groove, without any possibility of axial movement. A raceway for the rollers is defined in an outer cylindrical surface of the inner ring between two shoulders but, unlike the outer ring, the axial length between said two shoulders is greater than the axial length of rollers so as to define a circulation gauge. The rollers can slide axially between the two shoulders of the rotating inner ring, which allows relative axial movement between the center axle and the axle box housing, therefore the bogie.
    Typically, the radial space between the inner and outer rings of cylindrical roller bearing units is closed by sealing means so as to define a bearing chamber for the rollers. Said sealing means may consist of flanges fixed to the fixed outer ring or to the casing and forming a labyrinth seal with the rotating inner ring. The sealing means may include seals made of polymeric material and provided with a sliding lip. The sealing means prevent entry of dust, metal particles and water into the bearing chamber. The bearing chamber of the cylindrical roller bearing units is provided with lubricant, in particular grease to ensure the lubrication of the rolling and sliding contact between the rollers and the raceways of the inner and outer rings. The sealing means also make it possible to keep said lubricant inside the bearing chamber.
    However, the relative axial movement between the fixed outer ring and the rotating inner ring induces a displacement of grease in the bearing chamber. More specifically, the axial movement of grease in a closed chamber generates a pumping effect and tends to expel the grease out of the bearing chamber. The sealing means only partially block the grease, but significant grease leaks out of the bearing unit are generated, degrading the performance of the bearing and reducing the life of the bearing.
    SUMMARY OF THE INVENTION
    The object of the invention is to overcome these drawbacks by proposing a new axle box with axial floating capacity which prevents grease leakage, ensures a longer service life with high performance, and is economical and easy to manufacture. .
    To this end, the invention relates to a bogie axle box of a railway vehicle comprising a casing, a front cover fixed to a front side of said casing, a rear cover fixed to a rear side of said casing, a roller bearing unit. cylindrical, an end cover and a support ring.
    Said cylindrical roller bearing unit comprises a fixed outer ring mounted in a bore of the axle box housing, a rotating inner ring intended to be fixed to an axial end of a pivoting bogie axle, an annular bearing chamber defined radially between the inner ring and the outer ring, said rolling chamber being closed axially by sealing means, and at least one row of cylindrical rollers mounted in said rolling chamber radially between the inner ring and the outer ring and axially between a front sealing means and a rear sealing means, the inner ring having two shoulders capable of axially locking the rollers, so that the axial length between said two shoulders is greater than the axial length of the rollers to allow relative axial displacement of the rollers relative to the inner ring erieure.
    Said end cover comprises a central part traversed by screw bores and intended to be fixed by screw bolts to a front surface of the axial end of the pivoting bogie axle, and a radial flange extending radially outwardly from said central portion and defined to come into axial contact with a front end of the inner ring of the bearing unit.
    Said support ring is annular and mounted axially between a shoulder of the bogie axle and a rear end of the inner ring of the bearing unit.
    Said front cover comprises a cover part provided with an annular axial flange defined to come into axial contact with a front end of the outer ring of the bearing unit, said axial flange being mounted in the bore of the casing.
    Said rear cover has an annular axial flange defined to enter axially into contact with a rear end of the outer ring of the bearing unit, said axial flange being mounted in the bore of the casing.
    An annular front chamber is defined between the rolling unit, and more particularly the front sealing means, a part of the radial flange of the end cover, and the axial flange of the front cover, said front chamber being able to receive a part of the bearing unit, and more particularly the front sealing means, in the event of relative axial displacement between the casing and the bogie axle in a first axial direction. An annular rear chamber is defined between the rolling unit, and more particularly the rear sealing means, a radial part of the support ring, and the axial flange of the rear cover, said rear chamber being able to receive part of the 'bearing unit, and more particularly the rear sealing means, in the event of relative axial displacement between the casing and the bogie axle in a second axial direction.
    According to the invention, the casing comprises at least one conduit opening with a first opening in the bore of the casing beyond a front end of the outer ring and a second opening in the bore of the casing beyond a rear end of the outer ring. The axial flange of the front cover has at least one radial through hole. The axial flange of the rear cover has at least one radial through hole. The rear chamber and the front chamber are in fluid connection via the radial through hole (s) of the rear cover, the casing duct (s), and the radial through hole (s) of the front cover.
    Thanks to the invention, the two chambers on both sides of the rolling unit are in fluid connection by a bypass arrangement formed by the radial holes of the covers and the conduit through the casing.
    A relative axial movement between the axle and the bogie generates an overpressure in one of said chambers, and a depression in the other chamber. The pressures are then balanced between the rear and front chambers so as to prevent the pumping effect. The grease in the closed bearing chamber of the bearing unit is not affected by any pumping effect and the leakage of grease from the bearing unit is prevented.
    The bypass system is placed outside the bearing unit, and inside the axle box. The cylindrical roller bearing unit is intrinsically sealed and does not require any modification with the present invention. A standard cylindrical roller bearing unit with axial floating capacity can be used. The axle box does not require any additional components but only specific design adaptations with easy to manufacture ducts.
    According to other aspects of the invention which are advantageous but not compulsory, such a mechanical system could incorporate one or more of the following characteristics:
    - The cylindrical roller bearing unit has two rows of rollers which are axially adjacent.
    - The rollers are spaced circumferentially equally by a cage.
    - The sealing means of the cylindrical roller bearing unit are screens fixed to the outer ring and forming a labyrinth seal with the inner ring.
    - The duct (s) through the axle box casing consist of at least one axial groove in the bore of said casing, which extends axially along the outer ring, beyond one end front of the outer ring and beyond a rear end of the outer ring.
    - The axial groove or grooves made in the casing extend over the entire axial length of the bore of said casing.
    - The axial groove (s) are made outside the loaded area on the bearing unit.
    - The axial flange of the front cover has an outer cylindrical surface provided with an annular groove, the radial through hole or holes opening onto said annular groove.
    - The axial flange of the rear cover has an outer cylindrical surface provided with an annular groove, the radial through hole or holes opening onto said annular groove.
    - The axial flange of the front cover has a plurality of radial through holes which are spaced circumferentially equally.
    - The axial flange of the rear cover has a plurality of radial through holes which are spaced circumferentially equally.
    - The front cover comprises a radial flange extending radially outward from the axial flange, traversed by screw bores and intended to be fixed by screw bolts to a front surface of the casing.
    - The rear cover has a radial flange extending radially outward from the axial flange, crossed by screw bores and intended to be fixed by screw bolts to a rear surface of the housing.
    - The support ring includes sealing means with the rear cover.
    Another object of the invention is a railway bogie comprising a bogie chassis, a mounted axle provided with pivoting bogie axles and at least one axle box as described above and guiding in rotation a axial end of at least one of the bogie axles, and at least one suspension mounted between each of the axle boxes with the bogie chassis.
    SHORT DESCRIPTION OF THE DRAWINGS
    The invention will now be explained in correspondence with the attached figures, as illustrative examples, without limiting the subject of the invention. In the attached figures:
    - Figure 1 is a front view of an axle box;
    - Figure 2 is a sectional view along line I-I of the axle box of Figure 1;
    - Figures 3a, 3b and 3c are detailed views of the axle box of the
    Figure 2 in three positions;
    - Figure 4 is a perspective view on a casing of the axle box of Figure 2;
    - Figure 5 is a perspective view on a front cover of the axle box of Figure 2; and
    - Figure 6 is a perspective view on a rear cover of the axle box of Figure 2.
    DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS
    Figures 1, 2 and 3a show an axle box 1 comprising a casing 2 with a central bore 3 defining an axial passage for an axle 4, a cylindrical roller bearing unit 5 inserted in the bore 3 and guiding in rotation an axial end 6 of said axle 4, an end plug 7 screwed onto said axial end 6 of the axle 4, a support ring 8 interposed axially between a shoulder 9 of the axle 4 and the bearing unit 5 , a front cover 10 screwed onto a front surface 11 of the casing 2, and a rear cover 12 screwed onto a rear surface 13 of the casing 2.
    In this and the following embodiments, we also define the terms front and rear in relation to the position of the axle box relative to the railway bogie, a front part being positioned on an axial end of the gear box. axle towards the outside of the railway bogie, and a rear part being positioned on an axial end of the axle box towards the inside of the railway bogie.
    The casing 2 further comprises supports 14, 15 of springs intended to receive suspension means, such as helical springs (not shown), to support a bogie frame not shown.
    The cylindrical roller bearing unit 5 is mounted in the central bore 3 of the casing 2. The bearing unit 5 comprises a fixed outer ring 16 forcibly mounted in the bore 3 of the casing 2, a rotating inner ring 17 forcibly mounted on an outer cylindrical surface of the axial end 6 of the axle 4, a rolling chamber 18 defined radially between an outer cylindrical surface of the inner ring 17 and an inner bore of the outer ring 16.
    The front sealing means 19 oriented outwards from the axle 4 and the rear sealing means 20 oriented towards the opposite end of the axle 4 are placed on the two axial sides of the rolling chamber 18 so as to close said chamber 18.
    The rolling unit 5 further comprises two rows of cylindrical rollers 21, 22 arranged in said rolling chamber 18, said rollers 21, 22 being spaced circumferentially equally by cages 23, 24, respectively. In an alternative embodiment, the cylindrical roller bearing unit 5 has only one row of cylindrical rollers.
    The outer cylindrical surface of the inner ring 17 has two radial shoulders 25, 26 forming axial locking means for the rollers 21, 22 respectively and defining two axial spacings of axial lengths dl and d2 to allow the relative axial displacements of the rollers 21, 22 relative to the inner ring 17. In the present embodiment, the inner ring consists of two separate ring elements which are axially adjacent.
    The inner bore of the outer ring 16 has two annular grooves 27, 28 for the rows of rollers 21, 22 respectively. The axial length of each groove 27, 28 is substantially equal to the axial lengths of the rollers 21, 22 respectively, so as to prevent any axial displacement between the rollers 21, 22 and the outer ring
    16. In the present embodiment, the outer ring is made in one piece. Alternatively, the inner ring is a single piece and the outer ring consists of a plurality of ring elements placed side by side.
    Thanks to such an arrangement of the cylindrical roller bearing unit 5, the axle 4, which is fixed to the inner ring 17, can have a relative axial displacement relative to the casing 2, which is fixed to the outer ring 16 and integral in axial displacement with the rollers 21, 22, in a first direction F1 as shown in Figure 3b or a second direction F2 as shown in Figure 3c.
    The outer ring 16 is axially shorter than the inner ring
    17. The front sealing means 19 is formed by a screen fixed to a front end 29 of the outer ring 16 and defines a labyrinth seal with the outer cylindrical surface of the inner ring 17. On the other side, the means d rear seal 20 is also formed by a screen fixed to a rear end 30 of the outer ring 16 and defines a labyrinth seal with the outer cylindrical surface of the inner ring 17. In a variant not shown, the sealing means may comprise seals made of polymer and comprising sealing lips in sliding contact with the inner ring 17.
    Advantageously, the bearing chamber 18 is provided with lubricant, for example grease, to increase the performance of the bearing and to increase the service life of the bearing.
    The end plug 7 comprises a central part 31 provided with bores into which are inserted screw bolts 32 screwed into a front surface of the axial end 6 of the axle 4. The end cover further comprises a annular radial flange 33 extending radially outward from said central portion 31. Said radial flange 33 bears axially against a front end 34 of the inner ring 17 so as to axially lock said inner ring in one direction. The radial flange 33 further comprises an annular cylindrical surface which is aligned radially with the external cylindrical surface of the inner ring 17.
    The front cover 10 comprises a cover portion 35 extended by an annular axial flange 36 mounted in the bore 3 of the casing 2 of the axle box. The axial flange 36 carries axially against the front end 29 of the outer ring 16 so as to axially lock said outer ring in one direction. The axial flange 36 is further extended radially outwards by a radial flange 37 provided with bores in which are inserted screw bolts 38 screwed into a front surface 11 of the casing 2.
    The axial flange 36 of the front cover 10, the radial flange 33 of the end plug 7 and the front sealing means 19 of the rolling unit 5 define a front chamber 39 capable of receiving said sealing means before 19 an axial displacement of the axle 4 relative to the casing 2 in a direction F1 as illustrated in FIG. 3b.
    The axle end 6 is of smaller diameter than the rest of the axle 4 so as to define the shoulder 9. The support ring 8 has an annular body 40 provided for the curved corner formed by said shoulder 9 of the axle 4 and in axial reach with a rear end 41 of the inner ring 17. The annular body 40 of the bearing ring 8 has an outer cylindrical surface ίο which is aligned with the outer cylindrical surface of the inner ring 17.
    The rear cover 12 comprises an annular axial flange 42 mounted in the bore 3 of the casing 2. The axial flange 42 carries axially against the rear end 30 of the outer ring 16 so as to axially lock said outer ring in one direction. The axial flange 42 is further extended radially outwards by a radial flange 43 provided with bores in which are inserted screw bolts 44 screwed into the rear surface 13 of the casing 2.
    The rear cover 12 and the support ring 8 are provided with sealing means 45. In the present embodiment, the rear cover 12 and the support ring 8 are provided with labyrinth shapes cooperating to form a labyrinth seal. , and fitted with a sliding sealing ring.
    The axial flange 42 of the rear cover 12, the body 40 of the support ring 8 and the rear sealing means 20 of the rolling unit 5 define a rear chamber 46 capable of receiving said rear sealing means 20 during an axial displacement of the axle 4 relative to the casing 2 in a direction F2 as illustrated in Figure 3c.
    According to the invention, the bore 3 of the axle box casing 2 is provided with two axial grooves 47a, 47b which extend axially along the outer ring 16 of the rolling unit 5.
    Said grooves 47a, 47b extend axially over the entire axial length of said bore 3. As a variant, grooves could extend only over a limited length of said bore, but being provided with ends situated axially beyond the 'front end 34 and rear end 41 of said outer ring.
    As a variant, the axle box casing 2 is provided with a through duct, said duct being provided with openings in the bore 3 of the axle box casing 2, said openings being made axially beyond the 'front end 34 and rear end 41 of said outer ring.
    The axial grooves 47a, 47b are produced outside the zone loaded on the bearing unit 5 so as to prevent any rupture of said casing 2.
    According to another aspect of the present invention, a plurality of radial through holes 48 is produced in the part of the axial flange 36 of the front cover 10 which is arranged in the bore 3 of the casing 2 of the axle box. Said holes 48 are arranged in the bore 3 of the casing 2 of the axle box.
    According to an advantageous aspect of the present invention, the outer cylindrical surface of said flange 36 of the front cover 10 is also provided with an annular groove 49, said radial through holes 48 opening outwards in said annular groove 49.
    The holes 48 open outwards in fluid connection with a front side of axial grooves 47a, 47b produced in the bore 3 of the axle box casing 2 by means of the annular groove 49. The relative positions of the grooves axial 47a, 47b of the casing 2 and radial through holes 48 of the front cover 10 can be defined independently. The annular groove 49 of said front cover 10 guarantees the fluid connection between said axial grooves 47a, 47b of the casing 2 and the radial through holes 48 of the front cover 10.
    The holes 48 open inwards in fluid connection with the front chamber 39 defined on a front side and out of the unit 5 of cylindrical roller bearing. The front chamber 39 and the axial grooves 47a, 47b of the casing 2 are in fluid connection through the annular groove 49 and the radial through holes 48 of the front cover 10.
    The radial through holes 48 are spaced circumferentially equally on the annular axial flange 36 so as to allow a homogeneous distribution of the pressure regulation.
    Similarly, a plurality of radial through holes 50 is made in the part of the axial flange 42 of the rear cover 12 which is arranged in the bore 3 of the axle box casing 2. Said holes 50 are arranged in the bore 3 of the casing 2 of the axle box.
    The outer cylindrical surface of said flange 42 of the rear cover 12 is also provided with an annular groove 51, said radial through holes 50 opening towards the outside in said annular groove 51.
    The holes 50 open outwards in fluid connection with a rear side of axial grooves 47a, 47b produced in the bore 3 of the axle box casing 2 by means of the annular groove 51. The relative positions of the grooves axial 47a, 47b of the casing 2 and radial through holes 50 of the rear cover 12 can be defined independently. The annular groove 51 of said rear cover 12 guarantees the fluid connection between said axial grooves 47a, 47b of the casing 2 and the radial through holes 50 of the front cover 12.
    The holes 50 open inwards in fluid connection with the rear chamber 46 defined on a rear side and out of the unit 5 for cylindrical roller bearings. The rear chamber 46 and the axial grooves 47a, 47b of the casing 2 are in fluid connection through the annular groove 51 and the radial through holes 50 of the rear cover 12.
    The radial through holes 50 are spaced circumferentially equally on the annular axial flange 42 so as to allow a homogeneous distribution of the pressure regulation.
    Thanks to such an arrangement, the rear chamber 46 and the front chamber 39 which are located on two axial sides of the sealed bearing unit 5 are in fluid connection by the radial through holes 50 of the rear cover 12, the annular groove 51 of the rear cover 12, the axial grooves 47a, 47b in the bore 3 of the casing 2 of the axle box, the annular groove 49 of the front cover 10 and the radial through holes 48 of the front cover 10. This defines a bypass system where pressures are balanced.
    The axle box 1 is intended to be mounted on a middle axle end of a railway bogie with 3 or more axles and operates as follows.
    When the railway bogie travels a straight track, the bogie axles are in the same plane without any axial displacement. The cylindrical roller bearing unit 5 is in a normal position as illustrated in Figure 3a.
    When the railway bogie travels a curve on the track, the central axle 4 is offset axially with respect to the other two axles.
    The housing 2 is fixed to the bogie chassis. The front cover 10, the rear cover 12, the outer ring 16 and the rollers 21, 22 of the cylindrical roller bearing unit 5 are fixed to the casing 2 and form an assembly which is axially stationary. The inner ring 17 of the cylindrical roller bearing unit 5, the end plug 7 and the support ring 8 are fixed to the axle 4 and form an assembly which is axially movable.
    If the central axle has a relative axial displacement in the direction F1 towards the rear side of the bogie, the cylindrical roller bearing unit 5 is in an offset position as illustrated in FIG. 3b.
    By comparing the offset position of Figure 3b with the normal position of Figure 3a, the assembly of the center axle 4, the support ring 8, the end cover 8 and the inner ring 17 of the the bearing unit 5 has an axial displacement F1 towards the rear side of the bogie relative to the assembly of the front cover 10, the rear cover 12, the outer ring 16 and the rollers 21, 22 of the bearing unit 5 with cylindrical rollers, and casing 2.
    More specifically, the rollers 21, 22 have slid axially on the outer cylindrical surface of the inner ring 17 to an axial reach of the front rollers 21 against the front shoulder 25. The axial spacing between the rear shoulder 26 and the rear rollers 22 is equal to dl + d2 at most. The support ring 8 has an axial movement towards the rear side relative to the rear cover 12. The end plug 7 has an axial movement towards the rear side relative to the front cover 10. The front sealing means 19 of the bearing unit 5 is adjusted in the front chamber 39 defined for this purpose.
    With this relative axial movement, the volume of the front chamber 39 is reduced. An overpressure is generated in said front chamber 39. On the contrary, the volume of the rear chamber 46 is increased. A vacuum is generated in said rear chamber 46.
    If the central axle has a relative axial displacement in the direction F2 towards the front side of the bogie, the cylindrical roller bearing unit 5 is in an offset position as illustrated in FIG. 3c.
    By comparing the offset position of Figure 3c with the normal position of Figure 3a, the assembly of the center axle 4, the support ring 8, the end cover 8 and the inner ring 17 of the the bearing unit 5 has an axial displacement F2 towards the front side of the bogie relative to the assembly of the front cover 10, the rear cover 12, the outer ring 16 and the rollers 21, 22 of the bearing unit 5 with cylindrical rollers, and casing 2.
    More specifically, the rollers 21, 22 have slid axially on the outer cylindrical surface of the inner ring 17 to an axial reach of the rear rollers 22 against the rear shoulder 26. The axial spacing between the front shoulder 25 and the front rollers 21 is equal to dl + d2 maximum. The support ring 8 has an axial movement towards the front side relative to the rear cover 12. The end plug 7 has an axial movement towards the front side relative to the front cover 10. The rear sealing means 20 of the bearing unit 5 is adjusted in the rear chamber 46 defined for this purpose.
    With this relative axial movement, the volume of the front chamber 39 is increased. A vacuum is generated in said front chamber 39. On the contrary, the volume of the rear chamber 46 is reduced. An overpressure is generated in said rear chamber 46.
    Thanks to the invention and in the two cases illustrated in Figures 3b and 3c, the rear and front chambers 46, 39 are in fluid connection by a bypass system comprising the radial through holes 50 of the rear cover 12, the annular groove 51 of the rear cover 12, the axial grooves 47a, 47b in the bore 3 of the casing 2 of the axle box, the annular groove 49 of the front cover 10 and the radial through holes 48 of the front cover
    10. The front chamber overpressure 39 is transmitted by the bypass system to the rear chamber 46 placed under vacuum. This allows the pressure in the two chambers 39, 46 and the bypass system to be balanced. The so-called pumping effect between the rear and front sides of the sealed bearing unit 5 is prevented. The movement of lubricant in the sealed bearing chamber 18 of the bearing unit 5 is not affected by any pumping effect, and therefore limits the leakage of lubricant from the rear and front sealing means 20, 19.
    The embodiments described in the description can be arranged or combined together and are always within the meaning of the present invention.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Railway vehicle bogie axle box (1) comprising:
    - a housing (2),
    - a unit (5) of cylindrical roller bearing comprising a fixed outer ring (16) mounted in a bore (3) of the housing (2), a rotating inner ring (17) intended to be fixed to an axial end (6) a pivoting bogie axle (4), an annular rolling chamber (18) radially defined between the inner ring (17) and the outer ring (16), said rolling chamber (18) being axially closed by means ( 19, 20) for sealing, and at least one row of cylindrical rollers (21, 22) mounted in said bearing chamber (18) radially between the inner ring (17) and the outer ring (16) and axially between a means front seal (19) and rear seal means (20), the inner ring (17) having two shoulders (25, 26) capable of axially locking the rollers (21, 22), so that the length axial (dl, d2) between said two shoulders (25, 26) is greater than the axial length of the rollers (21, 22) to allow relative axial displacement of the rollers (21, 22) relative to the inner ring (17),
    - an end plug (7) fixed to the pivoting bogie axle (4) and provided with a radial flange (33) defined to axially come into contact with a front end (34) of the inner ring (17) the bearing unit (5),
    - an annular support ring (8) mounted axially between a shoulder (9) of the bogie axle (4) and a rear end (42) of the inner ring (17) of the bearing unit (5) ,
    - a front cover (10) fixed to a front side of said casing (2) and comprising a cover part (35) provided with an annular axial flange (36) defined to axially come into contact with a front end (29) of the outer ring (16) of the bearing unit (5), said axial flange (36) being mounted in the bore (3) of the casing (2),
    - a rear cover (12) fixed to a rear side of said casing (2) and comprising an annular axial flange (42) defined to axially come into contact with a rear end (30) of the outer ring (16) of the unit (5) for rolling, said axial flange (42) being mounted in the bore (3) of the casing (2),
    an annular front chamber (39) defined between the rolling unit (5), and more particularly the front sealing means (19), part of the radial flange (33) of the end plug (7), and the axial flange (36) of the front cover (10), said front chamber (39) being able to receive part of the bearing unit (5), and more particularly the front sealing means (19), in the event of displacement relative axial between the bogie axle (4) and the casing (2) in a first axial direction (Fl), and
    - an annular rear chamber (46) defined between the rolling unit (5), and more particularly the rear sealing means (20), a radial part (40) of the bearing ring (8), and the axial flange (42) of the rear cover (12), said rear chamber (46) being able to receive part of the bearing unit (5), and more particularly the rear sealing means (20), in the event of axial displacement relative between the bogie axle (4) and the housing (2) in a second axial direction (F2), characterized in that:
    - the casing (2) comprises at least one through duct (47a, 47b) with a first opening in the bore (3) of the casing (2) beyond a front end (29) of the outer ring (16 ) and a second opening in the bore (3) of the casing (2) beyond a rear end (30) of the outer ring,
    the axial flange (36) of the front cover (10) has at least one radial through hole (48), and
    - the axial flange (42) of the rear cover (12) has at least one radial through hole (50), the rear chamber (46) and the front chamber (39) being in fluid connection through the radial through hole (s) ( 50) of the rear cover (12), the duct (s) (47a, 47b) of the casing (2), and the radial through hole (s) (48) of the front cover (10).
    [2" id="c-fr-0002]
    2. An axle box according to claim 1, the means (19, 20) for sealing the unit (5) of cylindrical roller bearing being screens fixed to the outer ring (16) and forming a labyrinth seal with the inner ring (17).
    [3" id="c-fr-0003]
    3. Axle box according to any one of the preceding claims, the conduit or conduits through the casing (2) of the axle box (1) consisting of at least one axial groove (47a, 47b) in the bore (3) of said casing (2) which extends axially along the outer ring (16), beyond a front end (29) of the outer ring (16) and beyond a rear end (30) of the outer ring (16).
    [4" id="c-fr-0004]
    4. Axle box according to claim 3, the axial groove or grooves (47a, 47b) extending over the entire axial length of the bore (3) of said housing (2).
    [5" id="c-fr-0005]
    5. An axle box according to claim 3 or 4, the axial groove or grooves (47a, 47b) being produced outside the area loaded on the bearing unit (5).
    [6" id="c-fr-0006]
    6. Axle box according to any one of the preceding claims, the axial flange (36) of the front cover (10) comprising an outer cylindrical surface provided with an annular groove (49), the radial through hole or holes (48 ) opening in said annular groove (49).
    [7" id="c-fr-0007]
    7. Axle box according to any one of the preceding claims, the axial flange (42) of the rear cover (12) comprising an outer cylindrical surface provided with an annular groove (51), the radial through hole or holes (50 ) opening in said annular groove (51).
    [8" id="c-fr-0008]
    8. An axle box according to any one of the preceding claims, the axial flange (36) of the front cover (10) comprising a plurality of radial through holes (48) which are spaced circumferentially equally.
    [9" id="c-fr-0009]
    9. An axle box according to any one of the preceding claims, the axial flange (42) of the rear cover (12) having a plurality of radial through holes (50) which are spaced circumferentially equally.
    [10" id="c-fr-0010]
    10. Railway bogie comprising a bogie chassis, a mounted axle 10 provided with pivoting bogie axles and at least one axle box (1) according to any one of the preceding claims and guiding in rotation an axial end at least one of the axles of the bogie, and at least one suspension mounted between each of the axle boxes with the bogie chassis.
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    FR2956708A1|2011-08-26|Roller bearing, has rolling bodies maintained in housings arranged on side faces of bridges and radial crown whose free edge is arranged in radial annular groove such that crown forms axial abutment for rolling bodies
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    同族专利:
    公开号 | 公开日
    US20180170409A1|2018-06-21|
    US10604167B2|2020-03-31|
    DE102017222523A1|2018-06-21|
    FR3060504B1|2022-01-07|
    CN108202751A|2018-06-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE9301501D0|1993-05-12|1993-05-03|CONNECTING RING|
    US5462367A|1994-08-18|1995-10-31|The Timken Company|Compact bearing and stiffened journal|
    SE506574C2|1996-05-06|1998-01-12|Volvo Lastvagnar Ab|Sealing device for bearing arrangement and arrangement for sealing of bearing device|
    US6786645B2|2001-11-21|2004-09-07|The Timken Company|Mounting for vehicular road wheel|
    US7121728B2|2004-08-04|2006-10-17|Gunite Corporation|Seal for a bearing assembly|
    EP2557324B1|2010-04-08|2018-07-25|NTN Corporation|Bearing device for axle of railway vehicle|
    JP2014070656A|2012-09-28|2014-04-21|Jtekt Corp|Railroad vehicular bearing device|
    WO2014154259A1|2013-03-27|2014-10-02|Aktiebolaget Skf|Hub unit|
    US9789887B2|2015-05-11|2017-10-17|Aktiebolaget Skf|Backing ring assembly for railcar axle bearings|
    DE102015212067B4|2015-06-29|2017-11-09|Schaeffler Technologies AG & Co. KG|rolling bearing unit|
    EP3168105B1|2015-11-13|2020-05-06|Aktiebolaget SKF|Railcar adapter for connecting a railcar body to a bearing|
    EP3199419B1|2016-01-28|2018-12-19|Aktiebolaget SKF|Railway axlebox bearing assembly with mounting surface|
    JP6786323B2|2016-09-20|2020-11-18|Ntn株式会社|Axle bearing device|
    FR3060504B1|2016-12-16|2022-01-07|Skf Ab|AXLE BOX FOR RAILWAY VEHICLE BOGIE AND RAILWAY BOGIE EQUIPPED WITH SUCH AN AXLE BOX|
    DE102017208701A1|2017-05-23|2018-11-29|Aktiebolaget Skf|Axle bearing for a rail vehicle|FR3060504B1|2016-12-16|2022-01-07|Skf Ab|AXLE BOX FOR RAILWAY VEHICLE BOGIE AND RAILWAY BOGIE EQUIPPED WITH SUCH AN AXLE BOX|
    DE102017208701A1|2017-05-23|2018-11-29|Aktiebolaget Skf|Axle bearing for a rail vehicle|
    DE102019131041A1|2019-11-18|2021-05-20|Schaeffler Technologies AG & Co. KG|Axle set bearing for a rail vehicle|
    法律状态:
    2019-12-26| PLFP| Fee payment|Year of fee payment: 3 |
    2020-12-29| PLFP| Fee payment|Year of fee payment: 4 |
    2021-06-04| PLSC| Publication of the preliminary search report|Effective date: 20210604 |
    2021-12-27| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016225215.1|2016-12-16|
    DE102016225215|2016-12-16|
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