Stamping type bearing inner ring, tapered roller bearing and mounting method

Abstract

The invention discloses a stamping type bearing inner ring, a tapered roller bearing and an installation method.The inner ring is of an integrated structure, a first inner wall extends in the axial direction, the first inner wall and the first end of a first outer wall are connected into a whole through a first transition section, and the second end of the first inner wall and the second end of the first outer wall are in a free overhanging state; the first inner wall, the first outer wall and the first transition section jointly define a first inner cavity. The first end of the first outer wall is turned outwards to form a first annular turned edge, the second end of the first outer wall is provided with a second annular turned edge capable of adjusting the outward turning angle, and an annular roller path used for limiting the tapered roller is formed between the first annular turned edge and the second annular turned edge. And the bottom surface of the annular raceway is gradually shrunk and extends from the first annular turnup to the second annular turnup to form a first conical working surface matched with the conical roller. The inner ring of the bearing can be mounted between the retainer and the roller without interference, so that plastic deformation, roller scratch and dimensional deviation caused by pre-expansion-secondary compression of the retainer are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of bearings, and particularly relates to a stamping-type bearing inner ring, a tapered roller bearing, and an installation method. Background Art

[0002] A tapered roller bearing is a conical rolling bearing with a large-diameter end and a small-diameter end, which can bear radial and axial loads and is suitable for high-speed operation. It mainly includes an outer bearing ring, an inner bearing ring, a cage, and a number of rollers. The rollers are conical, so that the load can be evenly distributed along the length direction of the rollers. The raceway between the inner and outer rings is also conical and matches the cone angle of the rollers to ensure that the rollers can roll smoothly.

[0003] The inner ring of the traditional tapered roller bearing is a solid forging or casting, which is formed by multiple turning and grinding processes. There are problems such as low material utilization rate, large weight, and high production cost. As shown in the cross-sectional view of the traditional tapered roller bearing in Figure 1 , it includes an inner bearing ring 100, an outer bearing ring 200, a cage 300, and rollers 400. An annular raceway for the rollers to roll is provided on the outer side of the inner bearing ring 100, and the annular raceway is surrounded by convex edges 101 at both axial ends of the inner bearing ring 100. During the assembly process of the tapered roller bearing, it is necessary to place the cage 300 flat on the table with the large-diameter end facing up. After installing the rollers 400 into the pocket holes of the cage 300 one by one, then install the inner bearing ring 100 into the cage 300 from top to bottom. However, since the convex edges 101 at both ends of the inner bearing ring 100 interfere with the rollers 400, it forms an installation obstacle for the inner bearing ring 100. If the inner bearing ring 100 is forced into the space between the cage 300 and the rollers 400 by hard extrusion, it is easy to cause scratches and irreversible deformation.

[0004] In response to the above problems, the current main solution is to radially expand the cage by a certain proportion on the basis of the standard size in advance, so that there is still a certain redundant space inside after installing the rollers to avoid the convex edges of the inner bearing ring. After installing the inner bearing ring, the cage is adjusted by secondary compression. This method greatly slows down the assembly rhythm of the tapered roller bearing, increases the manual or equipment cost, and is difficult to achieve automatic assembly. Moreover, the plastic deformation of the expansion and compression of the cage easily causes fatigue of the cage material and deviation of the pocket hole size, affecting the movement accuracy of the rollers and shortening the bearing life. Summary of the Invention

[0005] The present application provides a stamping-type bearing inner ring to solve the technical problems of slow assembly rhythm, affecting the movement accuracy of rollers, and shortening the life existing in the installation method of the existing tapered roller bearing that first expands and then contracts the cage.

[0006] The technical solution adopted by the present application is as follows:

[0007] A stamping type bearing inner ring is formed into an integral structure through a stamping and bending process, and includes a first inner wall and a first outer wall arranged coaxially. The first inner wall extends axially. The first end of the first inner wall and the first end of the first outer wall are integrally connected through a first transition section. The second end of the first inner wall and the second end of the first outer wall are in a free overhanging state. The first inner wall, the first outer wall, and the first transition section jointly enclose a first internal cavity that extends continuously in the circumferential direction. The first end of the first outer wall is turned outward to form a first annular flange. The second end of the first outer wall is provided with a second annular flange whose outward turning angle can be adjusted. An annular raceway for limiting tapered rollers is formed between the first annular flange and the second annular flange. The bottom surface of the annular raceway gradually tapers and extends from the first annular flange to the second annular flange to form a first tapered working surface that cooperates with the tapered rollers.

[0008] In this technical solution, the bearing inner ring is formed by a stamping and bending process. The second end of the first outer wall is in a free overhanging state, providing a structural basis for turning the flange. Through the design of adjusting the turning angle of the second annular flange, the problem of assembly interference caused by the fixed convex edge of the bearing inner ring during the assembly process of traditional tapered roller bearings is solved. Through the solution of this application, the second annular flange can be kept in an unturned or slightly turned state before assembly, avoiding the installation stop obstacle of the roller to the second annular flange, so that the bearing inner ring can be inserted into the cage and the rollers without interference, avoiding the plastic deformation, roller scratching, and dimensional deviation caused by the pre-expansion - secondary compression of the cage in the traditional process. After assembly, the turning angle of the second annular flange is accurately adjusted to form a complete annular raceway, ensuring that the roller limiting accuracy and preload are controllable, simplifying the assembly process and supporting automated production. At the same time, the stamping and bending integrally formed bearing inner ring realizes lightweight and material cost reduction through the internal cavity, and the adjustable second annular flange design enables the same inner ring to adapt to various limiting preload requirements of the rollers, forming a synergistic technical advantage of "efficient assembly - high precision - low cost".

[0009] At least three support ribs are evenly distributed along the circumferential direction in the first internal cavity. The two ends of the support ribs along the radial direction of the first internal cavity respectively support the first inner wall and the first outer wall.

[0010] In this technical solution, by adding support ribs in the internal cavity, the overall rigidity of the bearing inner ring can be enhanced, the elastic deformation caused by the hollow structure can be inhibited, the radial distribution of the support ribs evenly transmits the load, preventing the relative displacement of the first inner wall and the first outer wall under high pressure, and improving the bearing capacity of the bearing.

[0011] One end of the support rib is fixedly connected to the first inner wall, and the other end abuts against the first outer wall; or, both ends of the support rib are fixedly connected to the first inner wall and the first outer wall respectively.

[0012] In this technical solution, the support ribs adopt two modes: "fixed connection + abutment" or "double-end fixation". The former allows for thermal expansion buffering, and the latter provides higher connection strength. Users can select an appropriate solution according to the working conditions, taking into account both structural stability and process flexibility.

[0013] Along the direction from the first annular flange to the second annular flange, the thickness of the first conical working surface gradually increases.

[0014] In this technical solution, the design of the gradually increasing thickness of the first conical working surface (thin at the large-diameter end close to the bearing and thick at the small-diameter end close to the bearing) matches the contact stress distribution law of the tapered roller (the small-diameter end is subjected to greater force). By locally thickening to compensate for strength, premature fatigue failure at the small-diameter end is avoided.

[0015] A nitrided layer or a chromium-plated layer with a thickness of 0.05 - 0.2 mm is provided on the first conical working surface.

[0016] In this technical solution, the nitrided layer or the chromium-plated layer improves the hardness and wear resistance of the first conical working surface, reduces the friction loss of the roller, and the chromium-plated layer additionally provides anti-corrosion ability, extending the service life of the bearing in a humid or highly polluted environment.

[0017] The stamping and bending process specifically includes: blanking a circular ring-shaped blank, successively bending the circular ring-shaped blank to form a first inner wall, bending to form a first outer wall, folding to form a first annular flange, and folding to form a second annular flange. The folding angle of the second annular flange is α; the folding angle of the second annular flange after the assembly of the tapered roller bearing in the stamped bearing inner ring is β, and α < β.

[0018] In this technical solution, the direct stamping process of the circular ring-shaped blank ensures that there is no weld seam on the bearing inner ring, and the structural integrity is high; a second annular flange with a folding angle of α is preformed on the bearing inner ring through the stamping and bending process. Among them, the folding angle α not only satisfies that the bearing inner ring can be inserted into the cage and the rollers without interference, but also provides a crease basis after folding, facilitating the bearing inner ring to continue folding along the crease to the angle β after being inserted into the cage and the rollers.

[0019] The stamping and bending process specifically includes: stamping and bending a rectangular blank into a long strip with a C-shaped cross-section, curling the long strip into a circular ring shape by a ring rolling machine, connecting the end joints to form a closed annular structure, and successively shaping the closed annular structure into a first inner wall, a first outer wall, a first annular flange, and a second annular flange. The folding angle of the second annular flange is α; the folding angle of the second annular flange after the assembly of the tapered roller bearing in the stamped bearing inner ring is β, and α < β.

[0020] In this technical solution, the circular rolling and welding process of rectangular blanks reduces the complexity of the mold, adapts to small-batch production of multiple specifications, and the welded seam is hidden inside the structure after subsequent shaping processes, avoiding weakening of strength.

[0021] Another object of this application is to provide a tapered roller bearing, which includes an outer bearing ring, a cage, and a plurality of rollers, and further includes the stamping-type inner bearing ring as described above. The cage isolates the plurality of rollers between the stamping-type inner bearing ring and the outer bearing ring and guides the plurality of rollers to roll in the annular raceway.

[0022] In this technical solution, the overall weight of the tapered roller bearing with a stamping-type inner bearing ring is reduced. When assembling, the preload is optimized by adjusting the angle of the second annular flange. The cooperation between the cage and the tapered annular raceway reduces the skewing of the rollers, improving the rotational accuracy and dynamic stability of the bearing. In addition, the effects of the stamping-type inner bearing ring are all included in the tapered roller bearing and will not be elaborated here.

[0023] The outer bearing ring is formed into an integral structure by a stamping and bending process, including a second inner wall and a second outer wall arranged coaxially. The first end of the second inner wall and the first end of the second outer wall are connected into one body through a second transition section. The second end of the second inner wall and the second end of the second outer wall are in a free overhanging state. The second inner wall, the second outer wall, and the second transition section jointly enclose a second internal cavity that extends continuously in the circumferential direction. The second inner wall tapers and extends from the second end to the first end to form a second tapered working surface that cooperates with the tapered rollers.

[0024] In this technical solution, the outer bearing ring also adopts a stamping and bending process to form a stamping hollow structure, further reducing the weight of the tapered roller bearing assembly. The first tapered working surface and the second tapered working surface enclose a tapered space for the rollers to roll. The rollers roll reliably along the annular raceway and the second inner wall, forming a uniform load distribution.

[0025] Another object of this application is to provide an installation method for the above-mentioned tapered roller bearing, including: placing the cage flat on the table with the large-diameter end facing up, and installing the tapered rollers into the pockets of the cage one by one; inserting the stamping-type inner bearing ring with the folding angle of the second annular flange being α from top to bottom into the cage; continuing to fold the second annular flange to form a folding angle β, where α < β; and installing the combination of the cage, the tapered rollers, and the stamping-type inner bearing ring into the outer bearing ring.

[0026] In this technical solution, based on the advantage that the folding angle of the second annular flange of the stamping-type bearing inner ring can be adjusted, the installation method is to fold the second annular flange step by step (α→β), avoiding the raceway damage caused by traditional knocking installation. The bearing inner ring can be installed between the cage and the rollers without interference, avoiding the plastic deformation, roller scratching and dimensional deviation caused by the pre-expansion-secondary compression of the cage in the traditional process. The pre-tightening force is dynamically controlled during the assembly process, and the operation is simple and the precision is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0028] Figure 1 is a cross-sectional view of the traditional tapered roller bearing provided by the present application;

[0029] Figure 2 is a structural schematic diagram of the stamping-type bearing inner ring provided by the present application;

[0030] Figure 3 is a cross-section of the stamping-type bearing inner ring provided by the present application Figure 1 ;

[0031] Figure 4 is a cross-section of the stamping-type bearing inner ring provided by the present application Figure 2 ;

[0032] Figure 5 is an assembly drawing of the tapered roller bearing provided by the present application;

[0033] Figure 6 is a cross-sectional view of the tapered roller bearing provided by the present application;

[0034] Figure 7 is a structural schematic diagram of the bearing outer ring provided by the present application;

[0035] Figure 8 is a cross-sectional view of the bearing outer ring provided by the present application;

[0036] Figure 9 is a process flow chart of the installation of the bearing inner ring between the cage and the rollers provided by the present application;

[0037] Figure 10 is a cross-section of the assembly component formed by the bearing inner ring, the cage and the rollers provided by the present application Figure 1 ;

[0038] Figure 11 is Figure 10 the enlarged view at A in

[0039] Figure 12 Cross-section of the assembly component formed by the bearing inner ring, cage, and rollers provided in this application Figure 2 ;

[0040] Figure 13 is Figure 12 the enlarged view at position B in

[0041] List of components and reference numerals:

[0042] 1 Bearing inner ring, 11 First inner wall, 12 First outer wall, 13 First transition section, 14 First internal cavity, 15 First annular flange, 16 Second annular flange, 17 Annular raceway, 18 First conical working surface, 19 Support rib;

[0043] 2 Bearing outer ring, 21 Second inner wall, 22 Second outer wall, 23 Second transition section, 24 Second internal cavity, 25 Second conical working surface;

[0044] 3 Cage;

[0045] 4 Roller. Detailed implementation manners

[0046] In the following description, many specific details are set forth to facilitate a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited by the specific embodiments disclosed below.

[0047] In addition, in the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "transverse", "longitudinal", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0048] In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] In the embodiments of this application, a stamping type bearing inner ring and a tapered roller bearing are provided. For the convenience of description and understanding, the following content provided in this application is all elaborated based on the illustrated product structure. Of course, those skilled in the art can understand that the above structure is only a specific example and schematic description, and cannot constitute a specific limitation to the technical solutions provided in this application.

[0051] Figure 1 is a cross-sectional view of a traditional tapered roller bearing, and the bearing inner ring 100 is a solid structure. Refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the stamping type bearing inner ring 1 of this application is formed into an integral structure through a stamping and bending process, and includes a first inner wall 11 and a first outer wall 12 arranged coaxially. The first inner wall 11 extends axially. The first end of the first inner wall 11 and the first end of the first outer wall 12 are connected into one body through a first transition section 13. The second end of the first inner wall 11 and the second end of the first outer wall 12 are in a free overhanging state. The first inner wall 11, the first outer wall 12, and the first transition section 13 jointly enclose a first internal cavity 14 that extends continuously in the circumferential direction; the first end of the first outer wall 12 is turned outwards to form a first annular flange 15. The second end of the first outer wall 12 is provided with a second annular flange 16 whose outward turning angle can be adjusted. An annular raceway 17 for limiting the tapered roller 4 is formed between the first annular flange 15 and the second annular flange 16. The bottom surface of the annular raceway 17 gradually shrinks and extends from the first annular flange 15 to the second annular flange 16 to form a first tapered working surface 18 that cooperates with the tapered roller 4 (the first end of the first inner wall 11 and the first end of the first outer wall 12 correspond to the large diameter end of the tapered roller bearing, and the second end of the first inner wall 11 and the second end of the first outer wall 12 correspond to the small diameter end of the tapered roller bearing).

[0052] In the technical solution, the folding angle of the second annular flange 16 can be adjusted to solve the assembly interference problem of the bearing inner ring caused by the fixed convex edge during the assembly process of the traditional tapered roller bearing. Through the solution of the present application, the second annular flange 16 can be kept unfolded or folded at a small angle before assembly, avoiding the installation stop obstacle of the roller 4 to the second annular flange 16, so that the bearing inner ring 1 can be installed between the retainer 3 and the roller 4 without interference, avoiding the plastic deformation, roller scratches and dimensional deviation caused by the pre-expansion and secondary compression of the retainer in the traditional process. After assembly, the folding angle of the second annular flange 16 is continued to be accurately adjusted to form a complete annular raceway 17, ensuring that the limit accuracy and preload force of the roller 4 are controllable, simplifying the assembly process and supporting automated production; at the same time, the bearing inner ring 1 formed by stamping and bending is lightweight and material cost is reduced through the internal cavity, and the adjustable second annular flange 16 design enables the same inner ring to adapt to the various limit preload force requirements of the roller 4, forming a synergistic technical advantage of "efficient assembly-high precision-low cost".

[0053] In specific implementation, the existing multi-station stamping die can be used to perform the stamping and bending process. The stamping and bending process can be specifically implemented in the following two embodiments:

[0054] Embodiment 1: Punch out a circular annular sheet, bend the circular annular sheet in sequence to form a first inner wall 11, bend to form a first outer wall 12, fold to form a first annular flange 15, fold to form a second annular flange 16, and the folding angle of the second annular flange 16 is α. In the embodiment, the folding angle of the second annular flange 16 after the stamping type bearing inner ring 1 realizes the assembly of the tapered roller bearing is β, α<β. Take the circular annular sheet as cold-rolled stainless steel as an example, after punching out the circular annular sheet on the cold-rolled stainless steel substrate, bend the first inner wall 11 at the first station of the multi-station stamping die, then bend the first outer wall 12 at the second station, then fold the first annular flange 15 at the third station, and then fold the second annular flange 16 at the fourth station, and control the initial angle α within a reasonable range, for example, within 15°; after the bearing inner ring 1 is installed in the retainer 3, the second annular flange 16 can be folded to β, and β can be greater than 90°. In this embodiment, the direct stamping and forming process of the circular ring sheet ensures that the bearing inner ring 1 has no welds and high structural integrity; a second annular flange 16 with a folding angle α is preformed on the bearing inner ring 1 through a stamping and bending process, wherein the folding angle α not only satisfies that the bearing inner ring 1 can be installed between the retaining frame 3 and the roller 4 without interference, but also provides a basis for the folding mark after folding, so that the bearing inner ring 1 can continue to be folded along the fold to an angle β after being installed in the retaining frame 3 and the roller 4.

[0055] Embodiment 2: Different from the way of stamping and forming through the circular sheet in the previous Embodiment 1, in this embodiment, a rectangular sheet is stamped and bent into a strip with a C-shaped cross-section, and the strip is curled into a circular ring by a curling machine, and the end joint is connected to form a closed annular structure. The first inner wall 11, the first outer wall 12, the first annular flange 15 and the second annular flange 16 are successively formed on the closed annular structure by shaping. The folding angle of the second annular flange 16 is α; the folding angle of the second annular flange 16 after the assembly of the tapered roller bearing in the inner ring 1 of the stamping type bearing is β, and α < β. Still taking the rectangular sheet as cold-rolled stainless steel as an example, after punching out the rectangular sheet on the cold-rolled stainless steel substrate, curling is carried out at the curling machine, and then laser welding or resistance welding is used to form a closed annular structure. Finally, the first inner wall 11, the first outer wall 12, the first annular flange 15 and the second annular flange 16 are successively stamped and shaped through the first station, the second station, the third station and the fourth station of the multi-station stamping die, and the initial angle α is controlled within a reasonable range, for example, controlled within 15°; after the inner ring 1 of the bearing is installed in the cage 3, the second annular flange 16 can be folded to β, and β can be greater than 90°. In this embodiment, the curling and welding process of the rectangular sheet reduces the complexity of the die, adapts to the production of multiple specifications and small batches, and the welding joint is hidden inside the structure through subsequent shaping processes, avoiding weakening of strength.

[0056] As a preferred implementation manner of the present application, as Figure 4 shown, at least three support ribs 19 are evenly distributed along the circumference in the first internal cavity 14, and both ends of the support ribs 19 along the radial direction of the first internal cavity 14 respectively support the first inner wall 11 and the first outer wall 12. In this technical solution, by adding the support ribs 19 in the internal cavity, the overall rigidity of the inner ring 1 of the bearing can be enhanced, the elastic deformation caused by the hollow structure can be inhibited, the radial distribution of the support ribs 19 evenly transmits the load, and the relative displacement between the first inner wall 11 and the first outer wall 12 under high pressure can be prevented, improving the bearing capacity of the bearing.

[0057] Regarding the connection method of the support ribs 19, the following embodiments can be adopted:

[0058] Embodiment 3: One end of the support rib 19 is fixedly connected to the first inner wall 11, and the other end abuts against the first outer wall 12. Taking the way of stamping and forming through the circular sheet in the previous Embodiment 1 as an example, the support rib 19 can be welded in advance at the position corresponding to the first inner wall 11 of the circular sheet, and then stamping is carried out. After stamping, the support rib 19 abuts against the first outer wall 12, avoiding the difficulty in connecting the support rib 19 caused by the limitation of the first internal cavity 14 after stamping. In an alternative solution, the support rib 19 can also be welded to the first inner wall 11 through the gap between the second free ends of the first inner wall 11 and the first outer wall 12 after the inner ring 1 of the bearing is stamped and shaped.

[0059] Embodiment 4: Both ends of the support rib 19 are fixedly connected to the first inner wall 11 and the first outer wall 12 respectively. Taking the example of stamping and forming from a circular sheet in the aforementioned Embodiment 1, the support rib 19 can be pre-welded at the position corresponding to the first inner wall 11 of the circular sheet. After stamping and bending a rectangular sheet into a C-shaped cross-section strip, the support rib 19 is welded to the position corresponding to the first outer wall 12, and then stamping and shaping are carried out. In an alternative solution, it is also possible to weld the support rib 19 to the first inner wall 11 and the first outer wall 12 through the gap between the second ends freely extending from the first inner wall 11 and the first outer wall 12 after the stamping and shaping of the bearing inner ring 1 are completed.

[0060] In Embodiment 3 and Embodiment 4, the support rib 19 adopts two modes of "fixed connection + abutment" or "double-end fixation". The former allows for thermal expansion buffering, and the latter provides higher connection strength. Users can select an appropriate solution according to the working conditions, taking into account both structural stability and process flexibility.

[0061] As a preferred embodiment of the present application, along the direction from the first annular flange 15 to the second annular flange 16, the thickness of the first tapered working surface 18 gradually increases. In this technical solution, the design of the gradually increasing thickness of the first tapered working surface 18 (thin at the large-diameter end close to the bearing and thick at the small-diameter end close to the bearing) matches the contact stress distribution law of the tapered roller 4 (the small-diameter end is subjected to greater force). By locally thickening to compensate for strength, premature fatigue failure at the small-diameter end is avoided.

[0062] Furthermore, a nitrided layer or a chromium-plated layer with a thickness of 0.05 - 0.2 mm is provided on the first tapered working surface 18. The nitrided layer or the chromium-plated layer improves the hardness and wear resistance of the first tapered working surface 18, reduces the friction loss of the roller 4, and the chromium-plated layer additionally provides corrosion resistance, extending the service life of the bearing in a humid or highly polluted environment.

[0063] As shown in Figure 5 and Figure 6 A tapered roller bearing provided by the present application includes a bearing outer ring 2, a cage 3, and a plurality of rollers 4, and also includes the stamping-type bearing inner ring 1 as described above. The cage 3 isolates the plurality of rollers 4 between the stamping-type bearing inner ring 1 and the bearing outer ring 2 and guides the plurality of rollers 4 to roll in the annular raceway 17. In this technical solution, the overall weight of the tapered roller bearing using the stamping-type bearing inner ring 1 is reduced. During assembly, the preload is optimized by adjusting the angle of the second annular flange 16. The cooperation between the cage 3 and the tapered annular raceway 17 reduces the skew of the rollers 4, improving the rotational accuracy and dynamic stability of the bearing; in addition, the effects possessed by the stamping-type bearing inner ring 1 are all included in the tapered roller bearing, and will not be elaborated here.

[0064] In a preferred embodiment, as shown in Figure 6 , Figure 7 and Figure 8As shown, the outer ring 2 of the bearing is formed into an integral structure by stamping and bending processes, including a second inner wall 21 and a second outer wall 22 arranged coaxially. The first end of the second inner wall 21 and the first end of the second outer wall 22 are connected as a whole through a second transition section 23. The second end of the second inner wall 21 and the second end of the second outer wall 22 are in a free overhanging state. The second inner wall 21, the second outer wall 22 and the second transition section 23 jointly enclose a second internal cavity 24 that extends continuously in the circumferential direction. The second inner wall 21 tapers and extends from the second end to the first end to form a second tapered working surface 25 that cooperates with the tapered roller 4 (the first end of the second inner wall 21 and the first end of the second outer wall 22 correspond to the small-diameter end of the tapered roller bearing, and the second end of the second inner wall 21 and the second end of the second outer wall 22 correspond to the large-diameter end of the tapered roller bearing). In specific implementation, the outer ring 2 of the bearing can also use an existing multi-station stamping die to perform the stamping and bending process. Since the existing stamping and bending process is very mature, the specific process details are not elaborated here. In this technical solution, the outer ring 2 of the bearing also adopts a stamping and bending process to form a stamping hollow structure, further reducing the weight of the tapered roller bearing assembly. The first tapered working surface 18 and the second tapered working surface 25 enclose a tapered space for the roller 4 to roll. The roller 4 rolls reliably along the annular raceway 17 and the second inner wall 21, forming a uniform load distribution.

[0065] An installation method for the above-mentioned tapered roller bearing provided by this application includes:

[0066] Place the cage 3 flat on the table with the large-diameter end facing up, and install the tapered rollers 4 one by one into the pockets of the cage 3; as Figure 9 shown is the state when all the rollers 4 are installed in the cage 3;

[0067] Install the stamping-type bearing inner ring 1 with the folding angle α of the second annular flange 16 from top to bottom into the cage 3; as Figure 10 and Figure 11 shown is the state when the bearing inner ring is installed in the cage 3, and at this time the folding angle of the second annular flange 16 is α;

[0068] Continue to fold the second annular flange 16 to form a folding angle β, where α < β; as Figure 12 and Figure 13 shown is the state when the folding angle of the second annular flange 16 is β;

[0069] Install the combination of the cage 3, the tapered rollers 4 and the stamping-type bearing inner ring 1 into the outer ring 2 of the bearing.

[0070] In this method, based on the advantage that the folding angle of the second annular flange 16 of the stamping type bearing inner ring 1 can be adjusted, the installation method folds the second annular flange 16 step by step (α→β), avoiding the raceway damage caused by traditional knocking installation. The bearing inner ring 1 can be inserted between the cage 3 and the rollers 4 without interference, avoiding the plastic deformation, roller 4 scratching and dimensional deviation caused by the pre-expansion - secondary compression of the cage 3 in the traditional process. The pre-tightening force is dynamically controlled during the assembly process, and the operation is simple and the precision is controllable.

[0071] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0072] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A stamped bearing inner ring, characterized in that: An integrated structure is formed by a stamping and bending process, comprising a first inner wall and a first outer wall which are coaxially arranged, the first inner wall extending axially, the first end of the first inner wall being connected to the first end of the first outer wall through a first transition section, the second end of the first inner wall being in a freely cantilevered state with the second end of the first outer wall, the first inner wall, the first outer wall and the first transition section together enclose a first internal cavity extending continuously in a circumferential direction; the first end of the first outer wall is folded outward to form a first annular flange, the second end of the first outer wall is provided with a second annular flange with an adjustable outward folding angle, an annular raceway for limiting a tapered roller is formed between the first annular flange and the second annular flange, the bottom surface of the annular raceway gradually extends from the first annular flange to the second annular flange to form a first conical working surface matching the tapered roller.

2. The stamped bearing inner ring according to claim 1, characterized in that: At least three supporting ribs are evenly distributed in the first internal cavity along the circumferential direction, and the supporting ribs respectively support the first inner wall and the first outer wall at two ends of the first internal cavity along the radial direction.

3. The stamped bearing inner ring according to claim 2, characterized in that: One end of the support rib is fixedly connected to the first inner wall, and the other end thereof is abutted against the first outer wall; or, Two ends of the supporting rib are fixedly connected to the first inner wall and the first outer wall respectively.

4. The stamped bearing inner ring according to claim 1, characterized in that: Along the direction from the first annular flange to the second annular flange, the thickness of the first conical working surface gradually increases.

5. The stamped bearing inner ring according to claim 4, characterized in that: The first conical working surface is provided with a nitriding layer or a chrome plating layer with a thickness of 0.05-0.2 mm.

6. The stamped bearing inner ring according to claim 1, characterized in that: The stamping and bending process specifically includes: punching out a circular ring-shaped sheet, bending the circular ring-shaped sheet in sequence to form a first inner wall, bending to form a first outer wall, folding to form a first circular flange, folding to form a second circular flange, and the folding angle of the second circular flange is α; The folding angle of the second annular flange after the tapered roller bearing is assembled on the inner ring of the stamped bearing is β, α<β.

7. The stamped bearing inner ring according to claim 1, characterized in that: The stamping and bending process specifically includes: stamping and bending a rectangular sheet into a C-shaped cross-section strip, curling the strip into a circular ring by a rolling machine, connecting the end seams to form a closed ring structure, and shaping the closed ring structure into a first inner wall, a first outer wall, a first annular flange and a second annular flange in sequence, wherein the folding angle of the second annular flange is α; The folding angle of the second annular flange after the tapered roller bearing is assembled on the inner ring of the stamped bearing is β, α<β.

8. A tapered roller bearing, comprising a bearing outer ring, a retaining frame and a plurality of rollers, characterized in that: It also includes a stamped bearing inner ring as described in any one of claims 1 to 7, wherein the retaining frame isolates the multiple rollers between the stamped bearing inner ring and the bearing outer ring and guides the multiple rollers to roll in the annular raceway.

9. The tapered roller bearing according to claim 8, characterized in that: The outer ring of the bearing is formed into an integral structure by a stamping and bending process, and includes a coaxially arranged second inner wall and a second outer wall, the first end of the second inner wall and the first end of the second outer wall are connected as a whole through a second transition section, the second end of the second inner wall and the second end of the second outer wall are in a freely cantilevered state, the second inner wall, the second outer wall and the second transition section together enclose a second internal cavity extending continuously in the circumferential direction, and the second inner wall gradually extends from the second end to the first end to form a second conical working surface that matches the tapered roller.

10. A method for installing a tapered roller bearing according to claim 8 or 9, characterized in that: include: Place the cage flat on the table with the large diameter end facing upwards, and install the tapered rollers one by one into the pockets of the cage; Install the stamped bearing inner ring with the second annular flange having a folding angle of α into the retainer from top to bottom; The second annular flange is further folded to form a folding angle β, α<β; Install the assembly of the cage, tapered rollers and stamped bearing inner ring into the bearing outer ring.

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