• 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:
    A bearing (10) rotating about an axis of rotation (100) comprises an outer ring (12) having a height E measured axially and on which is formed a raceway (18) rotated radially inwards, a ring one-piece interior (14) having a height H measured axially, having an outer annular surface (26) facing radially outward on which a raceway (20) is formed, and rolling bodies (16). interposed between the raceway (18) of the outer race (12) and the raceway (20) of the inner race (14). The inner ring (14) has an inner annular face (30) facing radially inwards, having an annular recess (32) extending axially on either side of the raceway (18) of the inner ring ( 14) and two shrinking seats (34) located axially on either side of the annular recess (32). The height E of the outer ring (12) is less than the height H of the inner ring (14), and preferably less than three quarters of the height H of the inner ring (14) and preferably less than two thirds of the inner ring (14). the height H of the inner ring (14).
    公开号:FR3020420A1
    申请号:FR1453801
    申请日:2014-04-28
    公开日:2015-10-30
    发明作者:Marc Paquien；Martial Sorlut；Cyprien Teillou
    申请人:NTN SNR Roulements SA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD OF THE INVENTION [0001] The invention relates to a bearing, particularly adapted to an assembly on a hollow shaft by radial deformation of the shaft, to an assembly between such a bearing and a hollow shaft, and in particular a camshaft, and a method of manufacturing a camshaft taking advantage of such a bearing. STATE OF THE PRIOR ART [0002] According to a known method for producing an internal combustion engine camshaft, as disclosed in FR 2 593 228, cams and plain bearing rings are formed with a cylindrical recess having splines, then the cams and bearing rings are fitted on a cylindrical hollow shaft, before axially inserting into the shaft a tool having protuberances arranged in alignment with the splines. The insertion of the tool causes a discharge of the material of the tube radially outwardly in the grooves, and provides a positive fixation of the rings and cams on the tube. This manufacturing method imposes an angular indexing of the tool relative to the flutes. It induces on the cams and bearing rings significant stresses after deformation of the shaft, which result in deformations of the functional surfaces of the cams and rings. These deformations are not penalizing insofar as the cams and plain bearing rings are generally ground after the assembly phase on the shaft. But they become a problem if it is desired to replace the plain bearings by bearings, the finishing of the raceways is made prior to assembly on the shaft. Also known is a method of manufacturing a camshaft, disclosed in US 4,875,270, and wherein is inserted a hollow shaft previously cooled at low temperature in a housing in which are positioned hollow parts, such as the inner rings of rolling and cam rings, previously heated, then radial expansion of the walls of the hollow shaft by any appropriate means, for example by a tool or by pressurizing the cavity of the shaft , before allowing the temperature equilibrium to be established, which has the effect of increasing the stresses at the interface fretted between the shaft and the parts. According to this method, it is envisaged to provide special reliefs of the inner walls of the bearing rings to ensure their positioning after the deformation phase. In particular, it is proposed to provide on the bearing rings, a groove facing inwards and to the hollow shaft, and wherein the walls of the hollow shaft are housed during the expansion phase. But this method does not guarantee a high accuracy of the alignment of the parts relative to the axis of the shaft after expansion, and also does not allow to easily rework the shapes of the parts after assembly. In particular, it does not correct after assembly possible misalignment of the various parts on the shaft.
    [0002] SUMMARY OF THE INVENTION [0004] The aim of the invention is to remedy the drawbacks of the state of the art and to propose means making it possible under better conditions for the hoop to shrink completely on a hollow shaft by radial deformation of the tree. To do this is proposed, according to a first aspect of the invention a bearing rotating about an axis of rotation and comprising: an outer ring having a height E measured axially and on which is formed a raceway turned radially inwards, an inner ring made in one piece, having a height H measured axially such that E <H, and preferably E <3H / 4, and preferably E <2H / 3, and having an outer annular face radially outwardly and on which is formed a raceway, the inner ring having an inner annular face turned radially inwardly, having an annular recess extending axially on either side of the raceway the inner ring and two shrinking seats located axially on either side of the annular recess, and - rolling bodies interposed between the raceway of the outer ring and the raceway of the inner ring. With its recess, the inner ring of this bearing is particularly suitable for mounting on a machine member, and in particular on a hollow shaft, for example a camshaft, by a method including a radial expansion, in particular by plastic deformation, the shaft on which was previously put the ring. Following the expansion of the shaft, the hooping surfaces are hooped on the deformed shaft, while the expanding material of the shaft between the hooping surfaces can freely fit into the annular recess of the ring. . Thus the stresses generated in the material of the inner ring by the hooping are confined in the regions of the inner ring located at the height of the hooping surfaces and do not propagate to the raceway, because the latter is without axial overlap with hooping surfaces. The portion of the inner ring located radially between the annular recess and the raceway is not stressed and undergoes no significant deformation. Furthermore, at least a portion of the outer face of the inner ring is axially projecting with respect to the outer ring, and can therefore serve as a reference surface, after mounting the bearing on a shaft or more generally on a rotating machine member, for example for a finishing step of this machine member. This protruding part can also serve as a support for a protective cover of the raceways and rolling bodies. According to one embodiment, the rolling bodies have a diameter (I), and the height E of the outer ring measured axially is preferably close to this diameter, preferably such that E <3 (I) / 2, and preferably E <4 (I) / 3. For these rolling bodies constituted by balls, the height E will also be greater than the diameter (I), so that the balls do not protrude axially relative to the outer ring and are properly protected. According to one embodiment, the two radially inwardly facing fretted bearing surfaces have the same constant cross section, so that their hooping conditions are identical. Due to its greater height, the outer face of the inner ring has at least a first reference surface rotated radially outwardly and axially projecting relative to the outer ring. This first reference range can in particular be used to position the inner ring or tighten during hooping. According to one embodiment, this first reference surface is cylindrical, and preferably ground, to form a journal which makes it possible to guide the rotation of the shaft for finishing operations, for example of cam rectification, without soliciting or even without rotate the rolling bodies of the bearing. Preferably, the outer face of the inner ring has a second reference surface, cylindrical axially projecting with respect to the outer ring, the second reference range being preferably ground, the raceway of the inner ring being between the first reference range and the second reference range. The inner ring is preferably symmetrical with respect to a plane of symmetry perpendicular to the axis of rotation. The raceway of the inner ring is preferably radially recessed relative to reference ranges. According to one embodiment, the outer face of the inner ring comprises two annular sealing grooves located axially on either side of the raceway of the inner ring, and axially on either side of the outer ring. These grooves are separated by a distance J measured in the axial direction such that J is slightly greater than E. It is thus possible to seal a U-section annular cover preferably consists of at least two parts, the edges of which lateral are inserted into the annular grooves, the cover being intended to protect the path of the inner ring, the path of the outer ring and the rolling bodies against pollutants, especially during a finishing phase of a tree to cams to which the bearing has been previously associated. The seal thus produced is preferably static. Indeed the outer ring does not need to be free in rotation. The annular reference surfaces formed on the outer face of the inner ring preferably have a relatively high axially measured height, which allows their use as reference surface during certain stages of finishing of a camshaft to which the ring has been previously associated. Thus, according to one embodiment, the inner ring has a height H measured axially, and the raceway has a width L measured axially, such that L <H / 2, and preferably L <H / 3. In this case, the annular recess has a width D, measured axially, such that D> L, and preferably D> 3/2 L, and preferably D> 2L. To ensure a secure axial positioning of the inner ring on the shaft, it may be advantageous to promote the constitution, during the radial deformation of the shaft, axial contact surfaces between the ring and the shaft . For this purpose it is possible to provide a shoulder between each of the hooping surfaces and the annular recess. Preferably, the ring has two plane annular end faces, which are preferably each connected to one of the hooping surfaces by a chamfer, the angle of which is preferably greater than 45 °, and preferably greater than 45.degree. 60 °. According to another aspect of the invention, it relates to a subassembly comprising a bearing as described above, and a protective annular cover in which is completely housed the outer ring, the annular protective cover , preferably in at least two parts, coming radially bearing against the outer face of the inner race, axially on either side of the raceway of the inner race. If the inner ring is provided with sealing grooves as described above, the cover can advantageously fit into these grooves. This subassembly is particularly suitable for a mounting method which comprises a prior step of mounting the subassembly on a rotating machine member, for example a camshaft, including hollow camshaft, followed a finishing step of the machine member, which involves messy operations, for example a cam rectification in the case of a camshaft. The hood allows this finishing step without risk for the bearing. In addition, at least one of the radially outwardly facing lateral annular bearing surfaces may serve as a reference surface, for example to rotate the machine member, in this finishing step. According to another aspect of the invention, it relates to an assembly comprising a hollow shaft and at least one bearing as described above, the inner ring is hooped on the hollow shaft and assembled on the hollow shaft by radial expansion of the hollow shaft. The assembly preferably comprises an annular cover forming with the bearing a subset as described above. According to another aspect of the invention, it relates to a method of manufacturing a hollow camshaft, according to which is threaded on an undeformed shaft at least one cam and at least one bearing such that described above, then causes a plastic deformation of the shaft radially outwardly so as to secure the bearing with the shaft. The deformation of the shaft can be obtained in particular by pressurizing the hollow cavity of the shaft under hydraulic pressure, or by inserting force into the shaft of a tool performing the desired expansion. In order to limit the deformation of the reference annular bearing surfaces, it is advantageous to confine these surfaces by means of a tool during the swelling phase of the shaft. Following the joining of the inner ring of the bearing with the shaft, it can be provided to rectify the cam by rotating the shaft in rotation guiding the rotation of the shaft by sliding or rolling contact between a body of external guide and at least one reference annular bearing surface of the outer face of the inner race. It is also possible that at the time of grinding of the cam, the outer ring of the bearing is protected by a cover, as described above. BRIEF DESCRIPTION OF THE FIGURES [0026] Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate: FIG. 1, an axial sectional view of a bearing according to one embodiment of the invention; - Figure 2, an axial sectional view of a hollow camshaft equipped with the bearing of Figure 1; - Figure 3, a detail in the area III of Figure 2; - Figure 4, a subassembly comprising the bearing of Figure 1 and a protective cover; - Figure 5, bearing according to a second embodiment of the invention. For clarity, identical or similar elements are identified by identical reference signs throughout the figures. DETAILED DESCRIPTION OF EMBODIMENTS [0028] FIG. 1 illustrates a bearing 10 comprising an outer ring 12, an inner ring 14, and rolling bodies 16, here balls, rolling on tracks 18, 20 formed on the outer ring 12 and the inner ring 14. The bearing 10 may also comprise a retaining cage 22 of the rolling bodies 16, and possibly seals (not shown) extending radially between the rings, axially on the other hand. other tracks, to protect them. The raceways 18, 20 define an axis of rotation of the bearing 100, which, in this embodiment, is also an axis of symmetry of revolution for each of the rings 12, 14. The inner ring 14, in this embodiment , preferably has a transverse plane of symmetry 200 perpendicular to the axis of rotation 100 and passing through the race 20. [0029] Remarkably, the outer ring 12 has a height E, measured axially between its flat transverse faces end, which is significantly lower than the height of the inner ring H, also measured axially between its flat end faces 24. The height E is greater than the diameter (I) of the rolling body, but less than 3 (I). ) / 2, and in this case less than 4 (I) / 3. The inner ring 14 thus has an outer annular face 26, rotated radially outwards, on a central portion of which is formed the raceway 20, and which also has, axially on either side of the path 20 [0031] The inner ring 14 furthermore has an annular inner face 30, turned radially inwards, which has a central annular recess 32 and, in the case of a bearing 20, two cylindrical reference surfaces 28 which are not covered by the outer ring 12. axially on either side thereof, two annular bearing surfaces 34 identical, here cylindrical, projecting radially towards the axis 100 of revolution. The central recess 32 extends axially on either side of the race 20. Chamfers 36 provide the transition between the annular shrouds 34 and the end planar faces 24. [0032] The central recess 32 whose bottom is profiled in a circular arc of large radius, is of low depth, but large width D, in this case greater than the width L of the raceway, and even greater than twice the width L. Two shoulders or interior fillers 38 provide the transition between the central recess 32 and the shrinking seats 34. As illustrated in FIG. 2, the bearing 10, after assembly, can be mounted on a hollow shaft 40, for example a camshaft, without risk of deformation of the raceway 20. The procedure is as follows. In a first step, the pre-assembled bearing 10 is threaded onto the hollow shaft 40, the outside diameter of which is smaller than the inside diameter of the inner ring 14 at the hooping surfaces 34. Then, the shaft is deformed by any suitable means, for example by applying a high pressure in its hollow part or by inserting a tool, so as to cause a radial expansion of the wall 42 of the shaft 40, which is thus fretted by the hooping surfaces 34. The material of the shaft can freely fit at the recess 32, between the hooping surfaces 34, without creating stresses in the center of the inner ring 14. The stresses in the inner ring 14 are therefore located essentially at the ends. axial axis of the ring 14, away from the raceway 20. This is all the more true that the L / D ratio is low. If necessary, the radial deformation of the shaft may be accompanied by the formation of small beads of material which bear against the chamfers 36, 38, which further improves the securing of the axial positioning of the bearing 10 on the shaft 40. [0034] In the case of a camshaft, the cams (not shown) are shrunk on the hollow shaft at the same time as the bearing 10. The reference surfaces 28 of the inner ring 14 are then placed in a bezel or shoe 44 of a machine tool, forming momentarily a sliding bearing which makes it possible to rotate the shaft 40 around the axis of rotation 100 of the bearing 10 during a cam grinding operation. This avoids too much stress on the rolling bodies 16 and the raceways 18, 20 of the bearing 10 during grinding.
    [0003] During this grinding operation, the raceways 18, 20 and the rolling bodies 16 can be protected by means of a U-shaped annular cover 46 which covers the outer ring 12 by bearing on the reference spans 28. [ 0035] In Figure 4, there is shown the bearing 10 equipped with a protective annular cover having a U-shaped profile and consisting of at least two parts, whose branches are housed in two annular grooves 48 formed on the outer face 26 of the inner ring 14 and located on either side of the race 20 and axially projecting with respect to the outer ring 12. This ensures a perfect static seal and thus good protection during storage, transport, mounting and if necessary after mounting on the hollow shaft 40 for a finishing step.
    权利要求:
    Claims (4)
    [0001]
    REVENDICATIONS1. Bearing (10) rotating about an axis of rotation (100) and having an outer ring (12) having a height E measured axially and on which is formed a raceway (18) rotated radially inwards, a ring one-piece interior (14) having a height H measured axially, having an outer annular surface (26) facing radially outward on which a raceway (20) is formed, and rolling bodies (16). interposed between the race (18) of the outer race (12) and the race (20) of the inner race (14), the inner race (14) having an inner annular face (30) rotated radially towards the interior, having an annular recess (32) and two shrinking seats (34) located axially on either side of the annular recess (32), characterized in that the annular recess (32) extends axially on both sides of the road nt (18) of the inner ring (14) and the height E of the outer ring (12) is less than the height H of the inner ring (14), and preferably less than three quarters of the height H of the ring interior (14) and preferably less than two thirds of the height H of the inner ring (14).
    [0002]
    2. Bearing according to claim 1, characterized in that the rolling bodies have a rolling diameter (I), the height E being such that E <31) / 2, and preferably E <41) / 3.
    [0003]
    3. Bearing according to any one of the preceding claims, characterized in that the outer face (26) of the inner ring (14) comprises at least a first reference surface (28) cylindrical axially projecting with respect to the outer ring. (12), the first reference surface (28) being preferably ground.
    [0004]
    4. Bearing according to the preceding claim, characterized in that the outer face (26) of the inner ring (14) has a second reference surface (28) cylindrical axially projecting with respect to the ring 5. 6. 7. 8. 9. 10. The second reference surface (28) being preferably ground, the race (20) of the inner ring (14) being located between the first reference range (28) and the second reference range (28). Bearing according to the preceding claim, characterized in that the first reference surface (28) and the second reference surface (28) have heights measured axially, which are different from each other. Bearing according to any one of the preceding claims, characterized in that the outer face (26) of the inner ring (14) comprises two annular grooves (48) located axially on either side of the raceway ( 20) of the inner ring (14), and axially on either side of the outer ring (12). Bearing according to any one of the preceding claims, characterized in that the raceway (20) of the inner race (14) has an axially measured width L, such that L <H / 2, and preferably L <H / 3. Bearing according to the preceding claim, characterized in that the annular recess (32) has a width D, measured axially, such that D> L, and preferably D> 3/2 L, and preferably D> 2L. Bearing according to any one of the preceding claims, characterized in that between each of the hooping surfaces (34) and the annular recess (32) is formed a fillet or a shoulder (38). Bearing according to any one of the preceding claims, characterized in that the inner ring (14) has two plane annular end faces (24), each connected to one of the hooping surfaces (34) by a chamfer (36) presenting an angle greater than 45 °, preferably greater than 60 ° .11. Subassembly comprising a bearing (10) according to any one of the preceding claims, and an annular protective cover (46) in which the outer ring (12) is entirely housed, the annular protective cover (46) coming radially on bearing against the outer face (26) of the inner ring (14), axially on either side of the race (20) of the inner ring (14). Assembly comprising a hollow shaft (40) and at least one bearing (10) according to any one of claims 1 to 10, the assembly preferably comprising an annular cover (46) forming with the bearing (10) a subset according to claim 11. A method of manufacturing a hollow camshaft, characterized in that is threaded on an undeformed shaft (40) at least one cam and at least one bearing (10) according to any one of Claims 1 to 10, then causing a plastic deformation of the shaft (10) radially outwardly so as to secure the inner ring (14) of the bearing (10) with the shaft (40). Manufacturing method according to the preceding claim, characterized in that following the joining of the inner ring (14) of the bearing (10) with the shaft (40), the cam is rectified by rotating the shaft in rotation, guiding the rotation of the shaft by sliding or sliding contact between a shoe or a guide bezel (44) and at least one reference surface (28) of the outer annular face (26) of the inner race (14) of the bearing (10). Manufacturing method according to the preceding claim, characterized in that during the grinding of the cam, the bearing (10) is associated with a cover (46) to form a subassembly according to claim 11. 12. 13. 14. 25 15. 30
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3020420B1|2017-02-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3276828A|1965-11-17|1966-10-04|Adamson Stephens Mfg Co|Antifriction bearings including means for coupling them to shafts|
    FR2593228A1|1986-01-17|1987-07-24|Torrington Co|CAMSHAFT FOR ALTERNATIVE PISTON MOTORS AND METHOD FOR MANUFACTURING THE SAME|
    US6129456A|1998-07-31|2000-10-10|Ami Bearings, Inc.|Bearing assembly with locking collar|US20170138403A1|2015-11-16|2017-05-18|Jtekt Corporation|Rolling bearing|
    US9995343B2|2015-11-25|2018-06-12|Jtekt Corporation|Rolling bearing|
    US10047796B2|2016-04-04|2018-08-14|Jtekt Corporation|Rolling Bearing|
    JP6634785B2|2015-11-16|2020-01-22|株式会社ジェイテクト|Rolling bearing|
    法律状态:
    2015-04-21| PLFP| Fee payment|Year of fee payment: 2 |
    2015-10-30| PLSC| Search report ready|Effective date: 20151030 |
    2016-04-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-19| PLFP| Fee payment|Year of fee payment: 4 |
    2018-04-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-10| ST| Notification of lapse|Effective date: 20191206 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1453801A|FR3020420B1|2014-04-28|2014-04-28|BEARING, METHOD FOR ASSEMBLING SUCH A BEARING ON A HOLLOW SHAFT, AND METHOD FOR MANUFACTURING A CAM SHAFT EQUIPPED WITH SUCH BEARING|FR1453801A| FR3020420B1|2014-04-28|2014-04-28|BEARING, METHOD FOR ASSEMBLING SUCH A BEARING ON A HOLLOW SHAFT, AND METHOD FOR MANUFACTURING A CAM SHAFT EQUIPPED WITH SUCH BEARING|
    EP15153734.7A| EP2913549B1|2014-02-07|2015-02-04|Assembly of a rolling bearing on a hollow shaft and method for manufacturing a shaft provided with a bearing and a machine member|
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