Tapered roller bearing and rolling mill with tapered roller bearing

Abstract

The invention relates to a tapered roller bearing and a rolling mill having the same. The tapered roller bearing includes: a bearing outer ring; the bearing inner ring is at least partially surrounded by the bearing outer ring; the tapered rollers are positioned between the bearing inner ring and the bearing outer ring; and the retainer is positioned between the bearing inner ring and the bearing outer ring and is provided with a first annular base part, a second annular base part and a plurality of separation beams for connecting the first annular base part and the second annular base part, and a pocket for retaining one of the plurality of tapered rollers is limited between every two adjacent separation beams. Wherein in the cross section cut in the direction perpendicular to the length direction of the separation beam, the cross section area A of the separation beam meets the following relation: Dw is the diameter of the tapered roller, D is the outer diameter of the bearing outer ring, d is the inner diameter of the bearing inner ring, and Lw is the length of the tapered roller. The tapered roller bearing disclosed by the invention can solve the problems that the retainer is easy to break and the like in the prior art.

Description

Technical Field

[0001] This disclosure relates to tapered roller bearings and rolling mills having tapered roller bearings. Background Technology

[0002] Tapered roller bearings are widely used in various applications where radial and axial loads are required due to their unique design, and they perform particularly well when subjected to combined loads.

[0003] In some applications, specific operating conditions or processes can lead to damage to tapered roller bearings, particularly cage failure. For example, in the gearboxes of high-speed rolling mills, tapered roller bearings not only bear the high loads and impact loads from mill operation but also constantly endure rapid acceleration and deceleration. The cages of traditional tapered roller bearings currently used in rolling mills eventually suffer from insufficient strength, leading to pocket cracking or cage beam breakage. This results in shorter bearing life, impacting the normal operation and production efficiency of the rolling mill.

[0004] The purpose of this disclosure is to address the industry pain point of tapered roller bearings, such as those used in rolling mill gearboxes, failing or being damaged due to insufficient cage strength, through a simple and effective solution. Summary of the Invention

[0005] In response to the problems and needs mentioned above, this disclosure proposes a tapered roller bearing that solves the aforementioned problems and brings other technical benefits by adopting the following technical features.

[0006] On one hand, this disclosure proposes a tapered roller bearing, comprising: an outer ring; an inner ring, at least partially surrounded by the outer ring; a plurality of tapered rollers located between the inner and outer rings; and a cage located between the inner and outer rings, having a first annular base, a second annular base, and a plurality of spacers connecting the first and second annular bases, wherein a pocket for retaining one of the tapered rollers is defined between each pair of adjacent spacers. Wherein, in a cross-section taken perpendicular to the length of the spacers, the cross-sectional area A of the spacers satisfies the following relationship:

[0007]

[0008] Preferably, the cross-sectional area A of the partition beam satisfies the following relationship:

[0009]

[0010] More preferably, the cross-sectional area A of the partition beam satisfies the following relationship:

[0011]

[0012] Where Dw is the diameter of the tapered roller, D is the outer diameter of the outer ring of the bearing, d is the inner diameter of the inner ring of the bearing, and Lw is the length of the tapered roller.

[0013] According to the preferred scheme, the number of tapered rollers is 25 to 27.

[0014] According to a preferred embodiment, the ratio of the width to the thickness of the partition beam is between 1.75 and 2.25, preferably between 1.9 and 2.1.

[0015] According to a preferred embodiment, the cross-section has an outer edge away from the central axis of the tapered roller bearing and an inner edge close to the central axis of the tapered roller bearing, as well as two side edges connecting the inner edge and the outer edge, wherein each side edge has a truncated corner portion at the junction with the inner edge.

[0016] According to a preferred embodiment, the retainer has an outer diameter that tapers from the second annular base to the first annular base.

[0017] According to a preferred embodiment, the cage is made of a metal material with a yield strength of at least 300 N / mm². 2 Preferably, the yield strength of the metallic material is at least 325 N / mm². 2 More preferably, the yield strength of the metallic material is at least 350 N / mm². 2 .

[0018] According to a preferred embodiment, the retainer is made of a metal material with a tensile strength of at least 390 N / mm². 2 Preferably, the tensile strength of the metallic material is at least 405 N / mm². 2 More preferably, the tensile strength of the metallic material is at least 420 N / mm². 2 .

[0019] According to a preferred embodiment, the tapered roller bearing is a double-row tapered roller bearing.

[0020] According to a preferred embodiment, the cage has an integral structure.

[0021] According to a preferred embodiment, the first annular base has a flange extending radially inward.

[0022] This disclosure also proposes a rolling mill including a gearbox in which one or more tapered roller bearings as described in any of the preceding claims are disposed.

[0023] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0025] Figure 1 An overall view of the cage of a tapered roller bearing according to an exemplary embodiment is shown;

[0026] Figure 2 A partial cross-sectional view of the cage of a tapered roller bearing according to an exemplary embodiment is shown;

[0027] Figure 3 It shows Figure 2 Enlarged view of the circled part;

[0028] Figure 4 A partial cross-sectional view of the cage of a tapered roller bearing according to an exemplary embodiment is shown;

[0029] Figure 5 Another partial cross-sectional view of the cage of a tapered roller bearing according to an exemplary embodiment is shown.

[0030] List of reference numerals

[0031] 10. Cage

[0032] 11 First annular base

[0033] 12 Second ring base

[0034] 13. Dividing beam

[0035] 14 pockets

[0036] 15 Outer edge

[0037] 16 Inner Edges

[0038] 17 Side edges

[0039] 18. Chamfered section

[0040] 19. Edge banding

[0041] 20 tapered rollers Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0043] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0044] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0045] This disclosure relates to a tapered roller bearing and a rolling mill having a tapered roller bearing.

[0046] Tapered roller bearings are a type of separable rolling bearing. Their structural design allows them to withstand the combined action of radial and axial loads, making them widely used in industry.

[0047] Generally, a tapered roller bearing has an outer ring, an inner ring at least partially surrounded by the outer ring, a cage located between the inner and outer rings, and a plurality of tapered rollers as rolling elements. The outer ring is generally annular and is usually fixed to a bearing housing or machine housing, while the inner ring also has an overall annular shape and can rotate synchronously with the rotating shaft.

[0048] The inner ring of a tapered roller bearing may have a tapered inner surface. Correspondingly, the outer ring may also have a tapered outer surface, which mates with the tapered inner surface of the inner ring to support and guide the movement of the tapered rollers.

[0049] The tapered roller has a generally truncated cone shape with two circular end faces and a tapered sidewall extending between the two circular end faces.

[0050] The cage is used to hold and separate the plurality of tapered rollers, prevent adjacent tapered rollers from contacting each other, and guide the tapered rollers to roll correctly between the inner and outer rings of the bearing.

[0051] Optionally, tapered roller bearings may also include seals, lubrication grooves, and oil holes.

[0052] Optionally, the tapered roller bearing of this disclosure may have single-row, double-row, or four-row tapered rollers. Preferably, the tapered roller bearing of this disclosure is a double-row tapered roller bearing having two rows of tapered rollers arranged side by side, and having two side-by-side cages that respectively hold the two rows of tapered rollers. However, this disclosure is not limited thereto.

[0053] Figure 1 A schematic diagram of a cage 10 for a tapered roller bearing according to an exemplary embodiment of the present disclosure is shown. As shown, the cage 10 of the tapered roller bearing is generally annular in shape, and the outer diameter of the annular structure is not uniform along the axial direction, but rather generally tapers. The cage 10 includes two generally annular portions located at two ends, referred to as a first annular base 11 and a second annular base 12, respectively. The second annular base 12 has a larger diameter than the first annular portion. The cage 10 preferably has an outer diameter that tapers from the second annular base 12 to the first annular base 11. Figure 4 As shown, the first annular base 11 may have a radially inwardly extending flange 19. The flange not only provides necessary axial positioning but also allows it to withstand a certain axial load. For example, a single-row tapered roller bearing can typically withstand axial loads in one direction, while a double-row tapered roller bearing can withstand axial loads in both directions. Furthermore, the presence of the flange helps maintain the correct position of the rollers during bearing installation and operation. Although not shown, the second annular base 12 may also have a flange.

[0054] The retainer 10 further includes a plurality of partition beams 13 located between the first annular base 11 and the second annular base 12, connecting the first annular base 11 and the second annular base 12. The plurality of partition beams 13 are arranged spaced apart from each other. A pocket 14 for retaining the tapered roller 20 is defined between two adjacent partition beams 13. That is, each pocket 14 is defined by a portion of the first annular base 11, a portion of the second annular base 12, and two adjacent partition beams 13. Figure 1 The label shows two adjacent separator beams 13 and a pocket 14 defined by the two separator beams 13. Each pocket 14 of the retainer 10 defines a placement position for a tapered roller 20 to hold the corresponding tapered roller 20. The pocket 14 may be rectangular or trapezoidal in shape, and is preferably trapezoidal to better accommodate and receive the tapered roller 20. Figure 3 Show peace Figure 4 The tapered roller 20 is shown in the state of being held in the pocket 14 from different perspectives, where Figure 3 It is a section taken along the axis of the tapered roller bearing, and the cross-section passes through the axis of rotation of the tapered roller 20. Figure 4 The section is taken along a direction perpendicular to the axis of rotation of the tapered roller 20. In a tapered roller bearing, the axis of rotation of the tapered roller 20 is closer to the central axis of the bearing than the main body of the cage 10. In other words, a small portion of the tapered roller 20 protrudes from the radial outer surface of the cage 10, while the majority of the tapered roller 20 lies within the space enclosed by the cage 10.

[0055] Existing tapered roller bearings are prone to problems such as cracking near the cage pocket 14 or breakage of the cage 10 separator beam 13 due to impacts from the tapered rollers 20. Therefore, this disclosure redesigns the tapered roller bearing from multiple perspectives, including but not limited to: overall optimization of several key dimensions of the cage 10 and the dimensions of the tapered rollers 20 to structurally improve the strength of the cage 10; and changing the material of the cage 10 itself, using materials with higher tensile and yield strengths, etc. Details are described below.

[0056] First, this disclosure proposes that, in a cross-section taken perpendicular to the length direction of the partition beam 13, the cross-sectional area A of the partition beam 13 satisfies the following relationship:

[0057]

[0058] Preferably, the cross-sectional area A of the partition beam 13 satisfies the following relationship:

[0059]

[0060] More preferably, the cross-sectional area A of the partition beam 13 satisfies the following relationship:

[0061]

[0062] In the aforementioned formula, Dw is the diameter of the tapered roller 20, D is the outer diameter of the bearing outer ring, d is the inner diameter of the bearing inner ring, and Lw is the length of the tapered roller 20.

[0063] Figure 3 The cross-section of the partition beam 13 is shown and the cross-sectional area A is labeled.

[0064] In this disclosure, the diameter of the tapered roller 20 refers to the diameter at the midpoint of the tapered roller 20. The length of the tapered roller 20 refers to the distance between the two end faces of the tapered roller 20, measured along the axis of rotation of the tapered roller 20.

[0065] Without considering manufacturing errors, wear and tear, etc., the plurality of tapered rollers 20 have the same dimensions. Therefore, the "diameter of tapered roller 20" and "length of tapered roller 20" refer to the diameter and length that all tapered rollers 20 have.

[0066] Using the aforementioned formula, the parameters of the tapered roller bearing, such as the cross-sectional area A, the diameter of the tapered roller 20, the outer diameter of the outer ring of the bearing, the inner diameter of the inner ring of the bearing, and the length of the tapered roller 20, were optimized in an overall manner, thereby improving the overall strength of the cage 10 from a structural perspective.

[0067] The number of tapered rollers 20 can vary depending on the bearing size and load-carrying capacity requirements. Nevertheless, in this disclosure, the number of tapered rollers 20 in the tapered roller bearing is preferably set to 25-27. In particular, this disclosure preferably sets the number of tapered rollers 20 to 25-27 when the cage 10 of the tapered roller bearing satisfies Formula 1 above. Preferably, this disclosure preferably sets the number of tapered rollers 20 to 25-27 when the cage 10 of the tapered roller bearing satisfies Formula 2 above. This disclosure preferably sets the number of tapered rollers 20 to 25-27 when the cage 10 of the tapered roller bearing satisfies Formula 3 above. Experimental verification has shown that with this setting, the tapered roller bearing and its cage 10 have better structural strength.

[0068] To structurally improve the strength of the cage 10, this disclosure designs the width and thickness of the separator beam 13 of the cage 10 such that the ratio of the width to the thickness of the separator beam 13 is between 1.75 and 2.25. Preferably, the ratio is between 1.9 and 2.1, and more preferably, the ratio is approximately 2. Figure 3The width and thickness of the partition beam 13 are indicated by b and t, respectively. The thickness of the partition beam 13 is the distance between the two surfaces of the partition beam 13 facing the outer ring of the bearing and the inner ring of the bearing, respectively, and the width of the partition beam 13 is the maximum distance between the two surfaces of the partition beam 13 that define the edge of the pocket 14.

[0069] See also Figure 3 Preferably, the cross-section of the partition beam 13, taken perpendicular to its length, has a generally trapezoidal shape with chamfered corners. Specifically, the cross-section has an outer edge 15 away from the central axis of the tapered roller bearing and an inner edge 16 near the central axis of the tapered roller bearing. The outer edge 15 and the inner edge 16 may be arc-shaped or generally straight. The cross-section also has two side edges 17 connecting the inner edge 16 and the outer edge 15. Each side edge 17 has a chamfered corner portion 18 at the junction with the inner edge 16. It can be understood that... Figure 3 In the cross-section shown, the chamfered portion 18 appears as an inclined straight line; in an actual bearing, the chamfered portion 18 forms an inclined slope. This slope can be opposite to the surface of the tapered roller 20. By providing the chamfered portion 18, the arrangement space for the tapered roller 20 can be increased.

[0070] Preferably, the cage 10 of this disclosure has a one-piece structure. The one-piece cage 10 can be made of, for example, a sheet metal by a stamping process.

[0071] The retainer 10 of this disclosure can be made of a variety of conventional materials. However, it is preferred that the retainer 10 be made of a metallic material. In particular, according to a preferred embodiment of this disclosure, the retainer is made of a specific metallic material having a yield strength of at least 300 N / mm². 2 Preferably, the yield strength of the metallic material is at least 325 N / mm². 2 More preferably, the yield strength of the metallic material is at least 350 N / mm². 2 Furthermore, according to a preferred embodiment of this disclosure, the retainer is made of a metal material with a tensile strength of at least 390 N / mm². 2 Preferably, the tensile strength of the metallic material is at least 405 N / mm². 2 More preferably, the tensile strength of the metallic material is at least 420 N / mm². 2 It should be noted that, in the most preferred embodiment, the metal material forming the cage 10 simultaneously satisfies one of the aforementioned yield strengths and one of the aforementioned tensile strengths. Such material selection helps to improve the overall strength of the cage 10 and the operational stability of the bearing.

[0072] This disclosure also proposes a rolling mill including a gearbox, wherein one or more tapered roller bearings as described in any embodiment of this disclosure are disposed therein.

[0073] The exemplary embodiments of the proposed solution have been described in detail above with reference to preferred embodiments. By adopting the aforementioned features, optimizing the parameter design, structural design, and improving the material selection of tapered roller bearings, the problem of insufficient strength of the cage 10 in practical applications can be effectively solved, improving the overall durability of the bearing. In particular, it can solve the failure problem of insufficient strength of the cage 10 caused by rapid acceleration and deceleration of high-speed rolling mill gearboxes.

[0074] It will be understood by those skilled in the art that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, the protection scope of which is determined by the appended claims.

Claims

1. A tapered roller bearing, comprising: Bearing outer ring; The inner ring of the bearing is at least partially surrounded by the outer ring of the bearing; Multiple tapered rollers are located between the inner ring and the outer ring of the bearing; A cage, located between the inner ring and the outer ring of the bearing, has a first annular base, a second annular base, and a plurality of partition beams connecting the first annular base and the second annular base, with a pocket defined between each pair of adjacent partition beams for retaining one of the plurality of tapered rollers; In a cross-section taken perpendicular to the length of the partition beam, the cross-sectional area A of the partition beam satisfies the following relationship: Preferably, the cross-sectional area A of the partition beam satisfies the following relationship: More preferably, the cross-sectional area A of the partition beam satisfies the following relationship: Where Dw is the diameter of the tapered roller, D is the outer diameter of the bearing outer ring, d is the inner diameter of the bearing inner ring, and Lw is the length of the tapered roller.

2. The tapered roller bearing as described in claim 1, wherein, The number of tapered rollers is 25 to 27.

3. The tapered roller bearing as described in claim 1, wherein, The width-to-thickness ratio of the cage separator beam is between 1.75 and 2.25, preferably between 1.9 and 2.

1.

4. The tapered roller bearing as described in claim 1, wherein, The cross-section has an outer edge away from the central axis of the tapered roller bearing and an inner edge close to the central axis of the tapered roller bearing, as well as two side edges connecting the inner edge and the outer edge, wherein each side edge has a truncated corner portion at the junction with the inner edge.

5. The tapered roller bearing as described in claim 1, wherein, The cage has an outer diameter that tapers from the second annular base to the first annular base.

6. The tapered roller bearing as claimed in claim 1, wherein, The cage is made of a metallic material with a yield strength of at least 300 N / mm². 2 Preferably, the yield strength of the metallic material is at least 325 N / mm². 2 More preferably, the yield strength of the metallic material is at least 350 N / mm². 2 .

7. The tapered roller bearing as claimed in claim 1, wherein, The cage is made of a metal material with a tensile strength of at least 390 N / mm². 2 Preferably, the tensile strength of the metallic material is at least 405 N / mm². 2 More preferably, the tensile strength of the metallic material is at least 420 N / mm². 2 .

8. The tapered roller bearing as claimed in claim 1, wherein, The tapered roller bearing is a double-row tapered roller bearing.

9. The tapered roller bearing as claimed in claim 1, wherein, The cage has an integral structure.

10. A rolling mill comprising a gearbox, wherein one or more tapered roller bearings as described in any one of claims 1-9 are disposed therein.

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