Double-surface quenched large tapered roller bearing with mounting matching surface and raceway surface

Abstract

The utility model relates to the field of bearings, in particular to a mounting matching surface and raceway surface double-surface quenched large tapered roller bearing, which comprises a conical raceway inner ring and a conical raceway outer ring, the conical raceway inner ring is provided with an inward concave channel, and the conical raceway inner ring comprises an inner ring steel core part; the conical raceway inner ring comprises an inner ring steel core part, the surface of the inner ring steel core part is wrapped with a first quenching layer, the conical raceway outer ring comprises an outer ring steel core part, the surface of the outer ring steel core part is wrapped with a second quenching layer, a plurality of conical rollers are arranged between the conical raceway inner ring and the conical raceway outer ring, and a retainer is arranged on the conical rollers. According to the conical roller bearing, the hardness, the wear resistance and the fatigue strength of the surfaces of the conical roller path inner ring and the conical roller path outer ring are greatly improved, meanwhile, the conical roller bearing still has high toughness, the conical roller bearing not only has the bearing capacity for bearing stable loads, but also has the bearing capacity for bearing impact loads, and in addition, the manufacturing cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a large tapered roller bearing with a mounting fitting surface and a raceway surface both surface-hardened. Background Art

[0002] Tapered roller bearings refer to radial thrust rolling bearings whose rolling elements are tapered rollers. They are mainly used to bear radial and axial combined loads. They are widely used in heavy-duty trucks, large wind turbines, rolling mills, mining, metallurgy and other industries. Traditional tapered roller bearing manufacturing is divided into two categories. One category is made of high-carbon chromium bearing steel and processed and manufactured after overall quenching. This type of bearing has the bearing capacity to carry steady loads, but the bearing capacity for impact loads is poor. The other category is made of low-carbon carburized bearing steel that is carburized and then processed and quenched as a whole. This type of bearing has both the bearing capacity to carry steady loads and the bearing capacity to carry impact loads, but the manufacturing cost of this type of bearing is very high. For example, the patent with application number CN202221884657.5 discloses a tapered roller bearing, which consists of an inner ring, an outer ring, a retainer and a tapered roller. The tapered roller bearing is integrally quenched and has the above-mentioned defects. Therefore, there is an urgent need for a tapered roller bearing with low manufacturing cost and high bearing capacity for stable loads and impact loads. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a large tapered roller bearing with double-surface quenching on the mounting mating surface and the raceway surface, which solves the problems existing in the prior art. The large tapered roller bearing can be manufactured at a low manufacturing cost with the same performance as a bearing manufactured at a high manufacturing cost using low-carbon carburized bearing steel that is carburized and then subjected to overall quenching and processing, thereby achieving a technical cost reduction effect of low manufacturing cost and high product performance.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large tapered roller bearing with double-surface quenching of the mounting mating surface and the raceway surface, comprising a tapered raceway inner ring and a tapered raceway outer ring, the tapered raceway inner ring is provided with an inwardly recessed groove, and the tapered raceway inner ring comprises an inner ring steel core portion, the surface of the inner ring steel core portion is coated with a first quenching layer, the tapered raceway outer ring comprises an outer ring steel core portion, the surface of the outer ring steel core portion is coated with a second quenching layer, a plurality of tapered rollers are arranged between the tapered raceway inner ring and the tapered raceway outer ring, and a retaining frame is arranged on the tapered rollers.

[0007] Preferably, the first quenching layer includes a channel quenching layer and an inner ring quenching layer connected to the channel quenching layer, the thickness of the channel quenching layer is 8mm-10mm, and the thickness of the inner ring quenching layer is 1mm-3mm.

[0008] Preferably, the second quenching layer includes an outer raceway surface quenching layer in contact with the tapered roller and an outer ring quenching layer connected to the outer raceway surface quenching layer. The thickness of the outer raceway surface quenching layer is 8mm-10mm, and the thickness of the outer ring quenching layer is 1mm-3mm.

[0009] Preferably, the channel includes an inner raceway portion matching the tapered roller, the left and right ends of the inner raceway portion are respectively connected with a first rib and a second rib, an angle α exists between the first rib and the left side of the tapered roller, and the second rib contacts the right side of the tapered roller.

[0010] Preferably, the angle α is 13°-15°.

[0011] Preferably, a first W-shaped rib is connected between the inner ring quenching layer and the inner ring steel core.

[0012] Preferably, half of the first W-shaped rib is fixed in the inner ring quenching layer, and the other half is fixed in the inner ring steel core.

[0013] Preferably, a second W-shaped rib is connected between the outer ring quenching layer and the outer ring steel core.

[0014] Preferably, half of the second W-shaped rib is fixed in the quenching layer of the outer ring, and the other half is fixed in the steel core of the outer ring.

[0015] (III) Beneficial effects

[0016] The utility model arranges the tapered raceway inner ring to be composed of an inner ring steel core and a first quenching layer, and arranges the tapered raceway outer ring to be composed of an outer ring steel core and a second quenching layer, thus greatly improving the hardness, wear resistance and fatigue strength of the surfaces of the tapered raceway inner ring and the tapered raceway outer ring, while ensuring that the cores of the tapered raceway inner ring and the tapered raceway outer ring remain unchanged, so that they still have high toughness. The tapered roller bearing not only has the carrying capacity of bearing a steady load, but also has the carrying capacity of bearing an impact load, and has the same performance as a bearing manufactured at a high manufacturing cost using low-carbon carburized bearing steel that is carburized and then subjected to overall quenching and processing. In addition, the bearing in the utility model only needs to be quenched on the surface of the tapered raceway inner ring and the tapered raceway outer ring, and does not require overall quenching or carburizing, thereby greatly reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the conical raceway inner ring of the utility model.

[0019] Figure 3 It is a schematic diagram of the tapered raceway outer ring of the utility model.

[0020] Figure 4 For this utility model Figure 2 Schematic diagram after adding the first W-shaped rib.

[0021] Figure 5 For this utility model Figure 3 Schematic diagram after adding the second W-shaped rib

[0022] Figure 6 It is an overall schematic diagram of the channel of the utility model.

[0023] Figure 7 It is a schematic diagram of the tapered raceway inner ring and tapered roller of the utility model.

[0024] In the figure: 1-conical raceway inner ring, 2-conical raceway outer ring, 3-groove, 4-inner ring steel core, 5-first quenching layer, 6-outer ring steel core, 7-second quenching layer, 8-tapered roller, 9-retaining frame, 10-groove quenching layer, 11-inner ring quenching layer, 12-outer raceway surface quenching layer, 13-outer ring quenching layer, 14-inner raceway, 15-first rib, 16-second rib, 17-first W-shaped rib, 18-second W-shaped rib. DETAILED DESCRIPTION

[0025] The following will be combined with the attached embodiment of the present utility model Figure 1-7 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The utility model provides a technical solution: a large tapered roller bearing with double-surface quenching of the mounting mating surface and the raceway surface, comprising a tapered raceway inner ring 1 and a tapered raceway outer ring 2, the tapered raceway inner ring 1 is provided with an inwardly recessed groove 3, and the tapered raceway inner ring 1 comprises an inner ring steel core portion 4, the surface of the inner ring steel core portion 4 is wrapped with a first quenching layer 5, the tapered raceway outer ring 2 comprises an outer ring steel core portion 6, the surface of the outer ring steel core portion 6 is wrapped with a second quenching layer 7, a plurality of tapered rollers 8 are arranged between the tapered raceway inner ring 1 and the tapered raceway outer ring 2, and a retaining frame 9 is arranged on the tapered roller 8. The utility model arranges the tapered raceway inner ring 1 to be composed of the inner ring steel core portion 4 and the first quenching layer 5, and arranges the tapered raceway outer ring 2 to be composed of the outer ring steel core portion 6 and the second quenching layer 7, which greatly improves the hardness, wear resistance and fatigue strength of the surface of the tapered raceway inner ring 1 and the tapered raceway outer ring 2, while ensuring that the core of the tapered raceway inner ring 1 and the tapered raceway outer ring 2 remains unchanged, so that it still has high toughness. The tapered roller bearing has not only the bearing capacity of carrying a steady load, but also the bearing capacity of carrying an impact load, and has the same performance as the high-cost bearing manufactured by using low-carbon carburized bearing steel after carburizing and then overall quenching and processing. In addition, the bearing in the utility model only needs to be quenched on the surface of the tapered raceway inner ring 1 and the tapered raceway outer ring 2, and does not need to be overall quenched, nor does it need to be carburized, etc., which greatly reduces the manufacturing cost. The method of surface quenching the tapered raceway inner ring 1 and the tapered raceway outer ring 2 can be electromagnetic induction heating surface quenching.

[0027] The first quenching layer 5 includes a channel quenching layer 10 and an inner ring quenching layer 11 connected to the channel quenching layer 10. The thickness of the channel quenching layer 10 is 8mm-10mm, and the thickness of the inner ring quenching layer 11 is 1mm-3mm. The channel quenching layer 10 is subject to the friction of the rotation of the tapered roller 8, so the thickness of the channel quenching layer 10 is set to be much thicker than the thickness of the inner ring quenching layer 11. The thickness of the inner ring quenching layer 11 outside the channel quenching layer 10 is relatively much smaller because the external force such as friction is applied. Therefore, the thickness of the inner ring quenching layer 11 does not need to be set to be the same as the thickness of the channel quenching layer 10. This can reduce the manufacturing cost to a certain extent. The thickness of the channel quenching layer 10 is set to 8mm-10mm, and the thickness of the inner ring quenching layer 11 is set to 1mm-3mm. This thickness optimizes the bearing capacity of stable loads and the bearing capacity of impact loads, while also minimizing the cost, thereby saving costs.

[0028] The second quenching layer 7 includes an outer raceway surface quenching layer 12 in contact with the tapered roller 8 and an outer ring quenching layer 13 connected to the outer raceway surface quenching layer 12, the thickness of the outer raceway surface quenching layer 12 is 8mm-10mm, and the thickness of the outer ring quenching layer 13 is 1mm-3mm, wherein the thickness of the outer raceway surface quenching layer 12 is set to be the same as the thickness of the channel quenching layer 10, because the position of the outer raceway surface quenching layer 12 is also subject to the friction of the rotation of the tapered roller 8 like the channel quenching layer 10, so it is set to be the same as the thickness of the channel quenching layer 10. The thickness of the outer raceway surface quenching layer 12 is set to be thicker than the thickness of the outer ring quenching layer 13. Because the thickness of the outer ring quenching layer 13 outside the outer raceway surface quenching layer 12 is relatively much smaller due to the external force such as friction, the thickness of the outer ring quenching layer 13 does not need to be set to be the same as the thickness of the outer raceway surface quenching layer 12. This can reduce the manufacturing cost to a certain extent and play a role in saving costs.

[0029] The channel 3 includes an inner raceway portion 14 matching the tapered roller 8, and the left and right ends of the inner raceway portion 14 are respectively connected with a first rib 15 and a second rib 16, and an angle α exists between the first rib 15 and the left side of the tapered roller 8, and the second rib 16 contacts the right side of the tapered roller 8, wherein the first rib 15 and the second rib 16 are arranged to well limit the tapered roller 8, wherein the length of the first rib 15 is less than the length of the second rib 16, and the angle α is arranged to well limit the tapered roller 8, so that when the tapered roller 8 rotates, its left side will not generate friction with the first rib 15, thereby greatly reducing the resistance to the rotation of the tapered roller 8, and in addition, since the tapered roller 8 is affected by factors such as rotation speed, centripetal force, and external force during rotation, the angle α is arranged to leave a certain variation space for the influence of the above factors, thereby ensuring the normal rotation of the tapered roller 8.

[0030] The angle α is 13°-15°. The angle α is 13°-15°. On the one hand, the setting of this angle accommodates related influencing factors to ensure that the tapered roller 8 can rotate normally. On the other hand, the angle is not too large to reduce the blocking and limiting effect.

[0031] A first W-shaped rib 17 is connected between the inner ring quenching layer 11 and the inner ring steel core portion 4, wherein the setting of the first W-shaped rib 17 makes the connection between the inner ring quenching layer 11 and the inner ring steel core portion 4 more firmly after quenching, wherein the first W-shaped rib 17 has a good grip on the inner ring quenching layer 11 and the inner ring steel core portion 4, and will not cause the inner ring quenching layer 11 and the inner ring steel core portion 4 to split due to delamination after quenching.

[0032] Half of the first W-shaped rib 17 is fixed in the inner ring quenching layer 11, and the other half is fixed in the inner ring steel core 4. This arrangement enables the first W-shaped rib 17 to have a stronger grip on both the inner ring quenching layer 11 and the inner ring steel core 4, thereby achieving a better fixing effect of the two after quenching.

[0033] A second W-shaped rib 18 is connected between the outer ring quenching layer 13 and the outer ring steel core portion 6, wherein the second W-shaped rib 18 makes the connection between the outer ring quenching layer 13 and the outer ring steel core portion 6 more secure after quenching, wherein the second W-shaped rib 18 has a good grip on the outer ring quenching layer 13 and the outer ring steel core portion 6, and will not cause the outer ring quenching layer 13 and the outer ring steel core portion 6 to split due to stratification after quenching.

[0034] Half of the second W-shaped rib 18 is fixed in the outer ring quenching layer 13, and the other half is fixed in the outer ring steel core 6. This arrangement enables the second W-shaped rib 18 to have a stronger grip on both the outer ring quenching layer 13 and the outer ring steel core 6, thereby achieving a better fixing effect of the two after quenching.

[0035] Working principle: The utility model arranges the tapered raceway inner ring 1 to be composed of an inner ring steel core 4 and a first quenching layer 5, and arranges the tapered raceway outer ring 2 to be composed of an outer ring steel core 6 and a second quenching layer 7, thereby greatly improving the hardness, wear resistance and fatigue strength of the surfaces of the tapered raceway inner ring 1 and the tapered raceway outer ring 2, while ensuring that the cores of the tapered raceway inner ring 1 and the tapered raceway outer ring 2 remain unchanged, so that they still have high toughness. The tapered roller bearing not only has the carrying capacity to bear a steady load, but also has the carrying capacity to bear an impact load, and has the same performance as a bearing manufactured at a high manufacturing cost using low-carbon carburized bearing steel that is carburized and then subjected to overall quenching and processing. In addition, the bearing in the utility model only needs to be quenched on the surface of the tapered raceway inner ring 1 and the tapered raceway outer ring 2, and does not require overall quenching or carburizing, thereby greatly reducing the manufacturing cost. The surface quenching of the tapered raceway inner ring 1 and the tapered raceway outer ring 2 may be performed by electromagnetic induction heating surface quenching or the like.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large tapered roller bearing with double-surface hardening on the mounting surface and the raceway surface, characterized in that: The invention comprises a conical raceway inner ring (1) and a conical raceway outer ring (2), wherein the conical raceway inner ring (1) is provided with an inwardly recessed groove (3), and the conical raceway inner ring (1) comprises an inner ring steel core portion (4), the surface of the inner ring steel core portion (4) is coated with a first quenching layer (5), and the conical raceway outer ring (2) comprises an outer ring steel core portion (6), the surface of the outer ring steel core portion (6) is coated with a second quenching layer (7), and a plurality of tapered rollers (8) are provided between the conical raceway inner ring (1) and the conical raceway outer ring (2), and a retaining frame (9) is provided on the tapered rollers (8).

2. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 1, characterized in that: The first quenching layer (5) comprises a channel quenching layer (10) and an inner ring quenching layer (11) connected to the channel quenching layer (10), the channel quenching layer (10) has a thickness of 8 mm to 10 mm, and the inner ring quenching layer (11) has a thickness of 1 mm to 3 mm.

3. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 1, characterized in that: The second quenching layer (7) comprises an outer raceway surface quenching layer (12) in contact with the tapered roller (8) and an outer ring quenching layer (13) connected to the outer raceway surface quenching layer (12), the thickness of the outer raceway surface quenching layer (12) is 8 mm-10 mm, and the thickness of the outer ring quenching layer (13) is 1 mm-3 mm.

4. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 1, characterized in that: The channel (3) comprises an inner raceway portion (14) matched with the tapered roller (8), the left and right ends of the inner raceway portion (14) are respectively connected with a first rib (15) and a second rib (16), an angle α exists between the first rib (15) and the left side edge of the tapered roller (8), and the second rib (16) is in contact with the right side edge of the tapered roller (8).

5. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 4, characterized in that: The angle α is 13°-15°.

6. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 2, characterized in that: A first W-shaped rib (17) is connected between the inner ring quenching layer (11) and the inner ring steel core portion (4).

7. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 6, characterized in that: Half of the first W-shaped rib (17) is fixed in the inner ring quenching layer (11), and the other half is fixed in the inner ring steel core (4).

8. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 3, characterized in that: A second W-shaped rib (18) is connected between the outer ring quenching layer (13) and the outer ring steel core (6).

9. A large tapered roller bearing with double-surface hardening of the mounting mating surface and the raceway surface according to claim 8, characterized in that: Half of the second W-shaped rib (18) is fixed in the outer ring quenching layer (13), and the other half is fixed in the outer ring steel core (6).

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