Arc pocket retainer and cylindrical roller bearing with same

Abstract

The utility model belongs to the technical field of cylindrical roller bearings, and particularly relates to an arc pocket retainer and a cylindrical roller bearing with the same, the retainer comprises two side rings arranged in parallel at an interval and a plurality of cross beams connected between the two side rings, the plurality of cross beams are uniformly distributed in the circumferential directions of the two side rings in an annular array manner, and a pocket for placing a cylindrical roller is formed between every two adjacent cross beams; the pocket surface, used for forming the pocket, of the cross beam is an arc surface, the pocket surface is in curved surface contact with the circumferential surface of the cylindrical roller, the retainer is of a cylindrical roller guide structure, the outer diameter surface of the retainer and the outer ring are arranged at an interval, and the inner diameter surface of the retainer and the inner ring are arranged at an interval. The integral retainer can ensure the positioning and fixing of the bearing, is not easy to deform and damage, and has stability and safety. The inner surface of the retainer beam is an arc surface to facilitate roller guiding and lubrication, and the retainer adopts a rolling body guiding structure to facilitate bearing lubrication and increase the rotating speed of the bearing.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cylindrical roller bearing technical field, concretely relates to an arc shape pocket cage and cylindrical roller bearing with the cage. BACKGROUND

[0002] Traction motor bearing occupies an important position in the locomotive traction motor, is mainly used for supporting rotor shaft and connecting shaft, ensures the normal operation of motor, because the locomotive is influenced by bogie vibration in long-term frequent operation and cyclic operation, leads to the short service life of bearing. Traction motor bearing is divided into transmission end and non-transmission end bearing, and the non-transmission end bearing is a kind of mechanical component for connecting with non-shaft end as main body, and its main function is to support large balance load and transverse load under working condition, effectively protect mechanical equipment and prolong service life.

[0003] In prior art, the non-transmission end locomotive traction motor bearing adopts single-row cylindrical roller bearing, the cage of this bearing is two-piece cage formed by cage seat and cage cover, is connected by rivet, and the riveting quality influences the running stability of rolling element in raceway, the vibration of bearing is larger, and the rivet hole weakens the strength of cage, which influences the service life of bearing. This kind of cage is suitable for low-speed rotation of bearing, and there is no special requirement for the vibration speed of bearing, that is, the locomotive running speed is not more than 120km / h. SUMMARY

[0004] According to the defects in the above-mentioned prior art, the utility model aims at providing an arc shape pocket cage and cylindrical roller bearing with the cage, the vibration speed of bearing reaches V2 group, the calculated life is more than 300km, and it is suitable for locomotive running speed of 200km / h.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of an arc shape pocket cage, the cage includes two side rings arranged in parallel and spaced apart and a plurality of cross beams connected between the two side rings, the plurality of cross beams are evenly distributed in the circumferential direction of the two side rings in the form of annular array, and a pocket for placing a cylindrical roller is formed between adjacent two cross beams;The side surface of the cross beam for forming the pocket is a pocket surface, the pocket surface is a circular arc surface, the pocket surface is in surface contact with the circumferential surface of the cylindrical roller, the cage is a cylindrical roller guide structure, the outer diameter surface of the cage is spaced apart from the outer ring, and the inner diameter surface of the cage is spaced apart from the inner ring.

[0006] Further, the total thickness of the cage is 0.42 times the diameter of the cylindrical roller, the containing capacity of the cylindrical roller on the outer diameter side of the center line of the cage is 70% of the total thickness of the cage, the containing capacity of the cylindrical roller on the inner diameter side of the center line is 30% of the total thickness of the cage, and the containing part is spaced apart from the outer ring stop edge.

[0007] Further, the outer surface of the beam in the outer diameter direction protrudes from the outer diameter surface of the two side rings.

[0008] Further, the axial ends of the outer surface of the beam are connected to the two side rings through inclined transition surfaces.

[0009] Further, the cage is of an integral machining type.

[0010] Further, the four corners of the pocket are rounded.

[0011] A cylindrical roller bearing, comprising an inner ring, the above-mentioned arc-shaped pocket cage, and an outer ring arranged in sequence from inside to outside, wherein a cylindrical roller is arranged in the pocket of the arc-shaped pocket cage.

[0012] Further, the outer ring is of a double-rib structure, the inner ring is of a no-rib structure, the outer diameter surface of the cage is arranged at intervals with the rib of the outer ring, and the inner diameter surface of the cage is arranged at intervals with the outer diameter surface of the inner ring.

[0013] Further, the cylindrical roller bearing is assembled in a non-driving end locomotive traction motor.

[0014] The beneficial effects of the present application are as follows: the cage is of an integral machining type, the integral cage can ensure the positioning and fixing of the bearing, can ensure that the bearing has high strength and rigidity when subjected to load, is not easy to deform and damage, and can ensure the stability and safety of the bearing. The inner surface of the cage beam is a circular arc surface, which is convenient for roller guiding and lubrication, the cage adopts a rolling body guiding structure, which is conducive to improving bearing lubrication and improving bearing operating speed. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cylindrical roller bearing structure diagram in a non-driving end locomotive traction motor in the prior art;

[0016] Figure 2 is a cylindrical roller bearing structure diagram in a non-driving end locomotive traction motor of the present embodiment;

[0017] Figure 3 is Figure 2 a cage structure front view of a cylindrical roller bearing;

[0018] Figure 4 is Figure 2 a cage pocket structure enlarged view of a cylindrical roller bearing;

[0019] Figure 5 is Figure 2 a cage structure top view of a cylindrical roller bearing;

[0020] Figure 6Figure for keeping the cage pocket surface and roller contact diagram;

[0021] Figure: 01, cage seat, 02, outer ring, 03, roller, 04, inner ring, 05, cage cover;

[0022] 1, inner ring, 2, cage, 201, side ring, 202, beam, 2021 pocket surface, 2022 beam outer surface, 2023, inclined transition surface, 203, pocket, 2031, arc angle, 3, outer ring, 301, outer ring flange, 4, cylindrical roller;

[0023] S, the total thickness of the cage. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] Referring to the accompanying Figures 2-5 A cylindrical roller bearing assembled in a non-drive end locomotive traction motor, comprising an inner ring 1, a cage 2 and an outer ring 3 arranged from inside to outside in sequence, a cylindrical roller 4 is arranged in the pocket of the cage 2, the cage 2 comprises two side rings 201 arranged in parallel and spaced apart and a plurality of beams 202 connected between the two side rings 201, a plurality of beams 202 are evenly distributed in the circumferential direction of the two side rings 201 in the form of annular array, and the pocket 203 for placing the cylindrical roller 4 is formed between the adjacent two beams 202; the side surface of the beam 202 for forming the pocket 203 is the pocket surface 2021, the pocket surface 2021 is a circular arc surface, the pocket surface 2021 is in curved surface contact with the circumferential surface of the cylindrical roller, the outer ring 3 is a double flange 301 structure, the inner ring 1 is a flangeless structure, the cage 2 is a cylindrical roller guide structure, the outer diameter surface of the cage is arranged in spaced apart with the outer flange 301 of the outer ring, and the inner diameter surface of the cage is arranged in spaced apart with the outer diameter surface of the inner ring 1, the cage 2 is a whole machining type.

[0026] Based on the above technical solution, since the retainer 2 is an integral structure, the retainer is relatively strong and can confine the roller in the pocket. The retainer is combined with the double rib structure of the outer ring to effectively limit the axial displacement of the roller. There is no need for the inner ring rib to limit the roller. Therefore, in order to match the assembly of the integral retainer, the inner ring adopts a ribless structure. The pocket surface and the circumferential surface of the cylindrical roller are in different contact modes. Traditional bearings have line contact, while the arc surface of the pocket of this bearing and the contact surface of the roller are curved surface contact. This structure has a high degree of fit between the roller surface and the arc pocket surface, and the roller runs stably in the pocket, which increases the bearing speed and reduces vibration and noise, as shown below. Figure 6 shown.

[0027] Furthermore, the total thickness of the cage is 0.42 times the diameter of the cylindrical roller, the cylindrical roller enclosing capacity on the outer diameter side of the cage's rotation centerline is 70% of the total thickness of the cage, and the cylindrical roller enclosing capacity on the inner diameter side of the centerline is 30% of the total thickness of the cage, and the enclosing part is spaced apart from the outer ring rib 301.

[0028] Based on the above technical solution, the total thickness of the cage is the difference between the outer and inner diameters of the cage divided by 2. The thickness of the side ring and the crossbeam are not consistent. The commonly used one-piece cage structure adopts an external guide structure, that is, there is a small gap between the cage and the inner diameter of the outer ring. The cage relies on the outer ring rib to guide the rollers to rotate correctly. This structure is more suitable for medium-low speed and heavy load applications. The one-piece cage used in this bearing is a rolling element guided structure. The thickness is lighter than that of a two-piece cage (the thickness of the two-piece cage is 0.5 times the diameter of the cylindrical roller), making it suitable for high-speed bearing rotation. While maintaining the same number of rollers, this structure increases the cage beam width. The outer surface 2022 of the crossbeam protrudes from the outer diameter of the two side rings 201, enhancing crossbeam strength and improving bearing stability and service life. After the rollers are installed in the cage, a small gap exists on the outer diameter of the cage to accommodate the bearings. During bearing operation, the rolling elements guide the bearings. At high-speed rotation, the centrifugal force of the rollers causes their mass centers to move outward. This 70% outer envelope further enhances the stability of the rollers within the pockets. This guidance ensures smooth cage operation, reduces alternating stresses in the cage, and reduces the effects of various unbalanced forces. It is therefore particularly suitable for high-speed, light-load motors.

[0029] Furthermore, the crossbeam outer surface 2022 in the crossbeam outer diameter direction protrudes from the outer diameter surfaces of the two side rings 201, and the axial ends of the crossbeam outer surface 2022 are connected to the two side rings 201 via inclined transition surfaces 2023. The crossbeam thickness is widened, the crossbeam strength is enhanced, and it is suitable for the roller-guided cage of this embodiment.

[0030] Furthermore, the four corners of the pocket 203 are arc corners 2031, which increase the lubrication space and avoid interference.

[0031] The cage of the embodiment has the following features:

[0032] 1. High strength

[0033] The whole cage can ensure the positioning and fixing of the bearing, and can ensure that the bearing has high strength and rigidity and is not easy to deform and damage when subjected to load, thereby ensuring the stability and safety of the bearing.

[0034] 2. Special-shaped cage

[0035] The total thickness of the bearing cage before improvement is 0.5 times the diameter of the roller, and the total thickness of the cage after improvement is 0.42 times the diameter of the roller, and the total weight of the cage is reduced; the cage adopts a rolling body guiding structure, and the outer surface does not contact the outer ring rib, which is a non-outer guiding structure, the containment capacity of the roller on the center line is 70% of the total thickness, and the containment capacity of the roller below the center line is 30%, and the containment part avoids the outer ring rib; such structure is beneficial to improve the bearing lubrication and improve the bearing running speed.

[0036] 3. High speed

[0037] The inner surface of the cage beam is a circular arc surface, which is convenient for roller guiding and lubrication, the four corners of the pocket hole are circular arc corners, which can avoid interference between the pocket hole corner and the roller, minimize the stress concentration at the corner, facilitate lubrication, have small friction, relatively low noise, and realize high-speed rotation of the bearing.

[0038] 4. High bearing load

[0039] The whole cage structure can reduce the space of rivet riveting, and the design scheme increases one roller on the basis of the original scheme, improves the bearing load, meets the high bearing load demand, and improves the service life of the bearing.

[0040] 5. Small vibration

[0041] Because the whole cage structure is compact, light in weight, and has good fit between the circular arc pocket hole and the roller, the bearing has small vibration during work, the vibration speed reaches V2 group, the operation efficiency of the motor can be improved, and mechanical loss can be reduced.

[0042] It should be noted that the part not described in detail in the utility model is prior art.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms since such terms are only used to distinguish one element from another. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0048] The above embodiments are only the best mode of the present application. Obviously, the present application is not limited to the above embodiments, and can have many variations. All variations that can be directly derived or thought of by those skilled in the art from the content disclosed in the present application should be considered as falling within the protection scope of the present application.

Claims

1. An arc cage retainer characterized by: The cage comprises two side rings arranged in parallel and spaced apart, and a plurality of cross beams connected between the two side rings, the plurality of cross beams are evenly distributed in the circumferential direction of the two side rings in the form of an annular array, and a pocket hole for placing a cylindrical roller is formed between two adjacent cross beams; the side surface of the cross beam for forming the pocket hole is a pocket hole surface, which is a circular arc surface, the pocket hole surface is in curved surface contact with the circumferential surface of the cylindrical roller, the cage is a cylindrical roller guide structure, the outer diameter surface of the cage is spaced apart from the outer ring, and the inner diameter surface of the cage is spaced apart from the inner ring; the cage is of an integral machining type.

2. A pocketed raceway according to claim 1, wherein: The total thickness of the cage is 0.42 times the diameter of the cylindrical roller, the containment capacity of the cylindrical roller on the outer diameter side of the rotational center line of the cage is 70% of the total thickness of the cage, and the containment capacity of the cylindrical roller on the inner diameter side of the rotational center line of the cage is 30% of the total thickness of the cage, and the containment part is spaced apart from the outer ring.

3. A pocketed raceway according to claim 1, wherein: The outer surface of the cross beam in the outer diameter direction of the cross beam protrudes from the outer diameter surface of the two side rings.

4. A pocketed raceway according to claim 3, wherein: The axial ends of the outer surface of the cross beam are connected to the two side rings through inclined transition surfaces.

5. The arc cage cage of claim 1 wherein: The four corners of the pocket hole are circular arc corners.

6. A cylindrical roller bearing characterized by: The cage comprises an inner ring, the arc-shaped pocket hole cage of any one of claims 1-5, and an outer ring arranged in sequence from inside to outside, and a cylindrical roller is arranged in the pocket hole of the arc-shaped pocket hole cage.

7. A cylindrical roller bearing according to claim 6, characterized in that: The outer ring is a double-flange structure, the inner ring is a non-flange structure, the outer diameter surface of the cage is spaced apart from the flange of the outer ring, and the inner diameter surface of the cage is spaced apart from the outer diameter surface of the inner ring.

8. A cylindrical roller bearing according to claim 6, characterized in that: The cylindrical roller bearing is assembled in a non-drive end locomotive traction motor.

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