Cylindrical roller bearing

Abstract

The present disclosure relates to an invention for a cylindrical roller bearing to which under-race lubrication is applied by providing an inclined oil tab and an oil hole connected from the oil tab. One embodiment of the present disclosure discloses a cylindrical roller bearing comprising: an inner ring coupled to a shaft and having an inner ring raceway surface parallel to the circumferential direction of the shaft; an outer ring located outside the inner ring and having an outer ring raceway surface parallel to the inner ring raceway surface in the radially outward direction of the shaft; a plurality of rollers located between the inner ring raceway surface and the outer ring raceway surface; a cage located between the inner ring and the outer ring and maintaining the spacing between the plurality of rollers; a plurality of oil tabs located on the inner ring, inclined along the axial direction and longer than the length of the rollers; and an oil hole connecting the oil tabs and the inner ring raceway surface.

Description

Technology Field

[0001] The present disclosure relates to a cylindrical roller bearing. The present disclosure relates to a cylindrical roller bearing to which under-race lubrication is applied by providing an inclined oil tab and an oil hole connected from the oil tab. Background Technology

[0002] Lubrication is required during the operation of cylindrical roller bearings to reduce frictional wear and suppress temperature rise. Generally, lubrication is achieved by spraying lubricating oil toward the rollers of the cylindrical roller bearing. However, for cylindrical roller bearings used for high-speed rotation with a DmN value exceeding 2 million, this method may make smooth lubrication difficult as the lubricating oil is splashed away due to the high-speed rotation of the rollers. This prevents the formation of a lubricating film on the rollers, inner ring, and outer ring, which can lead to bearing overheating and premature delamination.

[0003] Meanwhile, there is a method of forming a lubricant supply path on the shaft to supply lubricant to the rollers, inner ring, and outer ring. However, this method cannot be used if machining the shaft is difficult.

[0004] The aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot be considered as publicly known technology disclosed to the general public prior to the filing of the present invention. The problem to be solved

[0005] The present disclosure aims to solve the aforementioned problems by providing a cylindrical roller bearing to which under-race lubrication is applied by providing an inclined oil tab and an oil hole connected from the oil tab.

[0006] However, these problems are exemplary, and the problems to be solved by the present invention are not limited thereto. Problems not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. means of solving the problem

[0007] One embodiment of the present disclosure discloses a cylindrical roller bearing comprising: an inner ring coupled to a shaft and having an inner ring raceway surface parallel to the circumferential direction of the shaft; an outer ring located outside the inner ring and having an outer ring raceway surface parallel to the inner ring raceway surface in the radially outward direction of the shaft; a plurality of rollers located between the inner ring raceway surface and the outer ring raceway surface; a cage located between the inner ring and the outer ring and maintaining the spacing between the plurality of rollers; a plurality of oil tabs located on the inner ring, inclined along the axial direction and longer than the length of the rollers; and an oil hole connecting the oil tabs and the inner ring raceway surface.

[0008] The oil tap includes an inlet of the oil tap that is open in the direction in which lubricating oil is sprayed and an end of the oil tap located inside the inner ring, and the distance between the inlet of the oil tap and the shaft may be closer than the distance between the end of the oil tap and the shaft.

[0009] The distance between the end of the oil tab and the shaft may be closer than the distance between the inner ring raceway surface and the shaft.

[0010] The above oil tab includes a first oil tab and a second oil tab adjacent to the first oil tab, and the first oil tab and the second oil tab are alternately spaced apart along the circumferential direction of the shaft, and the oil hole may include a first oil hole connecting the first oil tab and a first end of the inner ring raceway surface and a second oil hole connecting the second oil tab and a second end of the inner ring raceway surface.

[0011] The inner ring further includes a first wall surface connected perpendicularly to a first end of the inner ring raceway surface and a second wall surface connected perpendicularly to a second end of the inner ring raceway surface, and one end of a first oil hole connected to the first oil tap may be located between the first wall surface and the inlet of the first oil tap with respect to the axial direction, and one end of a second oil hole connected to the second oil tap may be located between the second wall surface and the end of the second oil tap with respect to the axial direction.

[0012] Other aspects, features, and advantages other than those described above will become clear from the following specific details, claims, and drawings for implementing the invention. Effects of the invention

[0013] A cylindrical roller bearing according to the embodiments of the present disclosure is provided with a plurality of oil taps and oil holes to apply under-race lubrication, thereby facilitating the machining of the shaft, reducing frictional wear of the bearing, and suppressing temperature rise.

[0014] A cylindrical roller bearing according to the embodiments of the present disclosure is provided with an inclined oil tab and an inclined oil hole, so that lubricating oil can move smoothly along the oil tab by centrifugal force.

[0015] In the cylindrical roller bearing according to the embodiments of the present disclosure, a first oil tab and a second oil tab are alternately arranged, and a first oil hole is connected to the first oil tab and a second oil hole is connected to the second oil tab, so that effective lubrication can be achieved at both the front and rear of the roller.

[0016] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from this specification and the accompanying drawings. Brief explanation of the drawing

[0017] FIG. 1 is a drawing showing a cylindrical roller bearing according to embodiments of the present disclosure. FIG. 2 is a cross-sectional view of a cylindrical roller bearing according to embodiments of the present disclosure, taken along the line I-I' of FIG. 1. FIG. 3 is a drawing showing a roller and a cage according to embodiments of the present disclosure. FIG. 4 is a cross-sectional view of a first oil tap and a first oil hole according to embodiments of the present disclosure, taken along the line II-II' of FIG. 1. FIG. 5 is a cross-sectional view of a second oil tap and a second oil hole according to embodiments of the present disclosure, taken along the line III-III' of FIG. 1. FIG. 6 is a cross-sectional view of a cylindrical roller bearing according to embodiments of the present disclosure, taken along the line IV-IV' of FIG. 1. Specific details for implementing the invention

[0018] Embodiments of the present disclosure may be understood by referring to the description of the invention and the drawings. The described embodiments may have various variations and may be implemented in other forms and are not limited to the embodiments described herein. Furthermore, the features of each of the various embodiments of the present disclosure may be combined with one another in whole or in part. Each embodiment may be implemented independently of one another or in relation to one another. The described embodiments are provided as examples to make the present disclosure complete and are intended to fully convey the spirit of the present disclosure to those skilled in the art to which the present disclosure pertains. The present disclosure is subject to all variations, equivalents, and substitutions within the spirit and technical scope of the present invention. Accordingly, processes, elements, and technologies that are not necessary to a person skilled in the art for a complete understanding of the embodiments of the present disclosure may not be described.

[0019] Throughout the attached drawings and specifications, unless otherwise noted, the same reference numerals, letters, or combinations thereof denote the same components, so redundant descriptions are omitted. Additionally, parts unrelated to the explanation have been omitted to clearly explain the present invention.

[0020] In the drawings, the relative sizes of elements, layers, and regions may be exaggerated for clarity. The use of hatching and / or shading in the attached drawings is generally provided to clarify the boundaries between adjacent elements. Therefore, the presence or absence of hatching or shading does not indicate the preferred form or requirements for specific materials, material properties, dimensions, proportions, commonalities between figure elements, and / or other characteristics, attributes, properties, etc., of the elements unless otherwise specified.

[0021] Various embodiments are described herein with reference to cross-sectional examples, which are schematic examples of embodiments and / or intermediate structures. Accordingly, the shapes in the drawings may vary, for example, as a result of manufacturing techniques and / or tolerances. Furthermore, specific structural or functional descriptions disclosed herein are merely examples to illustrate embodiments according to the concept of the invention. Accordingly, the embodiments disclosed herein should not be interpreted as being limited to the shapes of the illustrated areas and include, for example, variations in shape due to manufacturing.

[0022] The areas depicted in the drawings are by nature schematic and their shapes are not intended to exemplify or limit the actual shapes of the device areas. Furthermore, as recognized by a person skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure.

[0023] Numerous specific details are presented in the specification to provide a complete understanding of the various embodiments. However, the various embodiments may be implemented without these specific details or with one or more details. In other cases, well-known structures and devices are illustrated in block diagram form to avoid unnecessarily obscuring the various embodiments.

[0024] To facilitate explanation and to describe the relationship between one element or feature and another element or feature as illustrated in the drawings, spatially relative terms such as "below," "above," "lower," and "upper" may be used. Spatially relative terms are intended to include various directions of the device in use or operation in addition to the directions depicted in the drawings. For example, if the device in the drawings is inverted, another element or feature described as "below" or "lower" will face "above" the other element or feature. Thus, as exemplary terms, "below" and "lower" may include both upper and lower directions. The device may face other directions (e.g., rotated 90 degrees or in other directions), and spatially relative descriptions used herein should be interpreted accordingly. Likewise, if it is stated that the first part is positioned "above" the second part, this means that the first part is positioned on the upper or lower side of the second part.

[0025] Additionally, the expression “viewed in plan” means the case where the object is viewed from above, and the expression “in a schematic section” means the case where a schematic section is taken by cutting the object vertically. The term “viewed in side” means that the first object may be above, below, or to the side of the second object, and vice versa. Furthermore, the terms “overlap” or “superimposition” may include layer, stack, plane, extension, cover, or partial cover, or any other suitable term that a person skilled in the art understands and can understand. The expression “not overlapping” may include meanings such as “away from” or “separated from” and any other suitable equivalents recognized and understood by a person skilled in the art. The terms “plane” and “surface” may mean that the first object may face the second object directly or indirectly. Where a third object is present between the first object and the second object, the first object and the second object may be understood as facing each other but indirectly opposing each other.

[0026] When an element, layer, region, or component is referred to as being "formed," "connected," or "combined" to another element, layer, region, or component, it may be formed directly on the element, layer, region, or component, formed on the other element, layer, region, or component, or indirectly formed, connected, or combined to the other element, layer, region, or component. Additionally, "formed," "connected," or "combined" may collectively refer to direct or indirect combinations or connections of elements, layers, regions, or components, as well as integral or non-integral combinations or connections, so that one or more elements, layers, regions, or components may exist. For example, when an element, layer, region, or component is referred to as being "electrically connected" or "electrically combined" to another element, layer, region, or component, it may be directly electrically connected or combined to the other element, layer, region, or component, or the other element, layer, region, or component may exist. However, the terms "direct connection" or "direct coupling" mean that one component directly connects or combines with another component without an intermediate component, or is located on another component. Furthermore, in this specification, when a part of a layer, film, region, guide plate, etc. is formed on another part, the direction of formation is not limited to the upward direction, but includes cases where the part is formed on the side or bottom. Conversely, when a part of a layer, film, region, guide plate, etc. is formed "below" another part, it includes not only cases where the part is "immediately below" the other part, but also cases where there is another part between the part and the other part. Meanwhile, other expressions describing the relationship between components, such as "between," "immediately between," "adjacent to," and "immediately adjacent to," may be interpreted similarly.Also, when an element or layer is referred to as being "between" two elements or layers, it may be the only element between the two elements or layers, or there may be other elements in between.

[0027] For the purposes of this specification, expressions such as “at least one” or “any one” do not limit the order of individual elements. For example, “at least one of X, Y, and Z”, “at least one of X, Y, or Z”, and “at least one selected from the group consisting of X, Y, and Z” may include X alone, Y alone, Z alone, or any combination of two or more of X, Y, and Z. Similarly, expressions such as “at least one of A and B” and “at least one of A or B” may include A, B, or A and B. In this specification, the term “and / or” generally includes any combination of one or more related list items. For example, expressions such as “A and / or B” may include A, B, or A and B.

[0028] Terms such as "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers, and / or sections, but such elements, components, regions, layers, and / or sections are not limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Accordingly, the first element, component, region, layer, or section described below may be referred to as the second element, component, region, layer, or section without departing from the spirit and scope of the invention. Describing an element as the "first" element does not require or imply the existence of the second element or other elements. Terms such as "first," "second," etc. may also be used herein to distinguish different categories or sets of elements. For clarity, terms such as "first," "second," etc. may each denote "first category (or first set)," "second category (or second set)," etc.

[0029] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. As used herein, singular expressions are intended to include plural expressions, and plural expressions are intended to include the singular form unless the context clearly indicates otherwise. The terms “include,” “comprising,” and “have” mean to specify the presence of the features, integers, and steps specified herein. These expressions do not exclude the presence or addition of one or more other functions, steps, operations, components, and / or groups thereof.

[0030] Where one or more embodiments may be implemented differently, a specific process sequence may be performed differently from the described order. For example, two processes described consecutively may be performed substantially simultaneously or in the reverse order of the described order.

[0031] The terms “substantially,” “about,” “approximately,” and similar terms are used as terms of approximation rather than terms of degree, and mean satisfying the range of implied deviation of the measured or calculated value (e.g., the range of deviation due to the limitations of the measurement system). For example, “about” may mean within one or more standard deviations or within ±30%, 20%, 10%, or 5% of the specified value.

[0032] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with that meaning in the context of the relevant technology and / or this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0033] A cylindrical roller bearing (1) according to an embodiment of the present disclosure will be described below with reference to FIGS. 1 to 6.

[0034] FIG. 1 is a drawing showing a cylindrical roller bearing (1) according to embodiments of the present disclosure. FIG. 2 is a drawing showing a cross-section of a cylindrical roller bearing (1) according to embodiments of the present disclosure, cut along the line I-I' of FIG. 1.

[0035] The cylindrical roller bearing (1) may be subjected to under-race lubrication. The cylindrical roller bearing (1) may be used in a device that rotates at high speed, such as a gas turbine engine. Referring to FIGS. 1 and 2, the cylindrical roller bearing (1) may include an inner ring (100), an outer ring (200), a roller (300), a cage (400), an oil tap (500), and an oil hole (600).

[0036] The inner ring (100) can be coupled and fixed to the shaft (S). The inner ring (100) may be provided with an inner ring raceway surface (110). The inner ring raceway surface (110) may be parallel to the circumferential direction (C) of the shaft. The inner ring raceway surface (110) may come into contact with a roller (300) to be described later.

[0037] The outer ring (200) may be located on the outer side of the inner ring (100). The outer ring (200) may be coupled and fixed to another part on the outer side of the shaft (S). The outer ring (200) may have an outer ring raceway surface (210). The outer ring raceway surface (210) may be parallel to the inner ring raceway surface (110) in the radially outer direction of the shaft. The outer ring raceway surface (210) may come into contact with a roller (300) to be described later.

[0038] FIG. 3 is a drawing showing a roller (300) and a cage (400) according to embodiments of the present disclosure.

[0039] The roller (300) may be located between the inner ring raceway surface (110) and the outer ring raceway surface (210). The roller (300) may include a cylindrical shape extending parallel to the axial direction (A). There may be multiple rollers (300). Multiple rollers (300) may be spaced apart in the circumferential direction (C) of the axis.

[0040] The cage (400) may be located between the inner ring (100) and the outer ring (200). The cage (400) may maintain a gap between a plurality of rollers (300). Referring to FIG. 3, the cage (400) may include the shape of a ring. The cage (400) may have a pocket that penetrates in the radial direction of the axis. A roller (300) may be accommodated in the pocket.

[0041] FIG. 4 is a cross-sectional view of a first oil tap (510) and a first oil hole (610) according to embodiments of the present disclosure, taken along the line II-II' of FIG. 1. FIG. 5 is a cross-sectional view of a second oil tap (520) and a second oil hole (620) according to embodiments of the present disclosure, taken along the line III-III' of FIG. 1. FIG. 6 is a cross-sectional view of a cylindrical roller bearing (1) according to embodiments of the present disclosure, taken along the line IV-IV' of FIG. 1.

[0042] Referring to FIG. 4, the inner ring (100) may further include a first wall surface (120) and a second wall surface (130). The first wall surface (120) may be connected perpendicularly to the first end of the inner ring raceway surface (110). The first wall surface (120) may come into contact with the bottom surface of the roller (300). The second wall surface (130) may be connected perpendicularly to the second end of the inner ring raceway surface (110). The second wall surface (130) may come into contact with another bottom surface of the roller (300). That is, the inner ring raceway surface (110), the first wall surface (120), and the second wall surface (130) may come into contact with each side of the roller (300) while wrapping around the roller (300).

[0043] The oil tap (500) can serve as a passage for lubricating oil to flow into the inner ring raceway surface (110) where the inner ring (100) and the roller (300) come into contact. The oil tap (500) may be located on the inner ring (100).

[0044] The oil tap (500) may include an inlet (511, 521) of the oil tap and an end (513, 523) of the oil tap. The inlet (511, 521) of the oil tap may be open in the direction in which lubricating oil is sprayed. Referring to FIGS. 4 and 5, the lubricating oil may be sprayed from the right side of the inner ring (100). Lubricating oil sprayed from the outside through the inlet (511, 521) of the oil tap may flow into the interior of the inner ring (100). The end (513, 523) of the oil tap may be located inside the inner ring (100). The end (513, 523) of the oil tap may be closed.

[0045] The oil tap (500) may be inclined along the axial direction (A). Referring to FIG. 4, the distance (L1) between the inlet (511, 521) of the oil tap and the axis (S) may be closer than the distance (L2) between the end (513, 523) of the oil tap and the axis (S). Since the inner ring (100) rotates together with the axis (S), the lubricating oil introduced into the rotating inner ring (100) can move smoothly along the inclined oil tap (500) from the inlet (511, 521) of the oil tap to the end (513, 523) of the oil tap by centrifugal force.

[0046] The angle of inclination formed by the oil tap (500) and the shaft (S), the extended length of the oil tap (500), and the diameter of the oil tap (500) can be predetermined according to the size, rotational speed, etc. of the cylindrical roller bearing (1).

[0047] Meanwhile, the distance (L2) between the end (513, 523) of the oil tap and the shaft (S) may be closer than the distance (L3) between the inner ring raceway surface (110) and the shaft (S).

[0048] The oil tap (500) may be longer than the length of the roller (300). The length of the roller (300) refers to the extent to which the roller (300) extends in the axial direction (A). That is, referring to FIGS. 4 and 5, in the axial direction (A), the positions of the first wall surface (120) and the second wall surface (130) may be between the inlet (511, 521) of the oil tap and the end (513, 523) of the oil tap. In other words, the oil tap (500) may extend beyond the second wall surface (130) with respect to the axial direction (A). Accordingly, the lubricating oil can be effectively supplied not only to the first end of the inner ring raceway surface (110) connected to the first wall surface (120) but also to the second end of the inner ring raceway surface (110) connected to the second wall surface (130).

[0049] There may be multiple oil taps (500). The oil taps (500) may include a first oil tap (510) and a second oil tap (520). Referring to FIG. 1, the second oil tap (520) may be adjacent to the first oil tap (510). That is, the first oil tap (510) and the second oil tap (520) may be alternately spaced apart along the circumferential direction (C) of the axis. The first oil tap (510) is shown in FIG. 4, and the second oil tap (520) is shown in FIG. 5.

[0050] The oil hole (600) can serve as a passage for lubricating oil to flow into the inner ring raceway surface (110). The oil hole (600) can connect the oil tap (500) and the inner ring raceway surface (110). The oil hole (600) can be extended at a different angle from the oil tap (500) so that the lubricating oil flowing into the oil tap (500) is supplied to a specific part of the inner ring raceway surface (110).

[0051] The oil hole (600) may include a first oil hole (610) and a second oil hole (620). The first oil hole (610) may be connected to a first oil tap (510), and the second oil hole (620) may be connected to a second oil tap (520).

[0052] Referring to FIG. 4, the first oil hole (610) can connect the first oil tap (510) and the first end of the inner ring raceway surface (110). As previously described, the first end of the inner ring raceway surface (110) can be connected perpendicularly to the first wall surface (120). Accordingly, the lubricating oil supplied through the first oil hole (610) can be supplied not only to the inner ring raceway surface (110) but also to the first wall surface (120) that can come into contact with the roller (300).

[0053] One end (611) of the first oil hole connected to the first oil tap (510) may be located between the first wall surface (120) and the inlet (511) of the first oil tap (D1) with respect to the axial direction (A). The other end (613) of the first oil hole may be connected to the first end of the inner ring raceway surface (110). That is, when the lubricating oil moves from the first oil tap (510) to the first oil hole (610), the direction of flow of the lubricating oil may be changed at an acute angle. Accordingly, the kinetic energy of the lubricating oil at the beginning of the first oil tap (510) can be utilized to smoothly supply lubricating oil to the first end of the inner ring raceway surface (110).

[0054] Meanwhile, as described above, the distance (L2) between the end (513) of the first oil tap and the shaft (S) may be closer than the distance (L3) between the inner ring raceway surface (110) and the shaft (S). That is, as one end (611) of the first oil hole connected to the first oil tap (510) moves toward the other end (613) of the first oil hole connected to the first end of the inner ring raceway surface (110), it may move further away from the shaft (S). Accordingly, the lubricating oil can move smoothly from one end (611) of the first oil hole to the other end (613) of the first oil hole by the centrifugal force caused by the rotation of the shaft (S).

[0055] Referring to FIG. 5, the second oil hole (620) can connect the second oil tap (520) and the second end of the inner ring raceway surface (110). As previously described, the second end of the inner ring raceway surface (110) can be connected perpendicularly to the second wall surface (130). Accordingly, the lubricating oil supplied through the second oil hole (620) can be supplied not only to the inner ring raceway surface (110) but also to the second wall surface (130) that can come into contact with the roller (300).

[0056] One end (621) of the second oil hole connected to the second oil tap (520) may be located between the second wall surface (130) and the end (523) of the second oil tap (D2) with respect to the axial direction (A). The other end (623) of the second oil hole may be connected to the second end of the inner ring raceway surface (110). That is, when the lubricating oil moves from the second oil tap (520) to the second oil hole (620), the direction of flow of the lubricating oil may be changed at an obtuse angle. Accordingly, the lubricating oil may flow into the second oil hole (620) by the force of striking and bouncing off the end (523) of the second oil tap and be smoothly supplied to the second end of the inner ring raceway surface (110).

[0057] Meanwhile, as described above, the distance (L2) between the end (523) of the second oil tap and the shaft (S) may be closer than the distance (L3) between the inner ring raceway surface (110) and the shaft (S). That is, as one end (621) of the second oil hole connected to the second oil tap (520) moves toward the other end (623) of the second oil hole connected to the second end of the inner ring raceway surface (110), it may move further away from the shaft (S). Accordingly, the lubricating oil can move smoothly from one end (621) of the second oil hole to the other end (623) of the second oil hole by the centrifugal force caused by the rotation of the shaft (S).

[0058] The angle of inclination formed by the oil hole (600) and the shaft (S), the extension length of the oil hole (600), and the diameter of the oil hole (600) can be predetermined according to the size and rotational speed of the cylindrical roller bearing (1), the angle of inclination formed by the oil tap (500) and the shaft (S), the extension length of the oil tap (500), and the diameter of the oil tap (500).

[0059] Referring to FIGS. 1, 4 to 6, the first oil tap (510) and the second oil tap (520) may be alternately spaced apart, and the first oil hole (610) connected to the first oil tap (510) may supply lubricating oil to the first end of the inner ring raceway surface (110), and the second oil hole (620) connected to the second oil tap (520) may supply lubricating oil to the second end of the inner ring raceway surface (110). Accordingly, lubricating oil may be supplied alternately to the first end and the second end of the inner ring raceway surface (110). That is, effective lubrication may be achieved at both the front and rear of the roller (300).

[0060] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative. Those skilled in the art will fully understand that various modifications and equivalent alternative embodiments are possible from the embodiments. Accordingly, the true technical scope of protection of the present invention should be determined based on the appended claims.

[0061] The specific technical details described in the embodiments are merely examples and do not limit the technical scope of the embodiments. To make the description of the invention concise and clear, descriptions of general prior art and configurations may be omitted. Furthermore, the connections of lines or connecting members between components depicted in the drawings are illustrative of functional connections and / or physical or circuit connections, and may be replaced or represented by various additional functional, physical, or circuit connections in actual devices. Additionally, unless specifically stated with terms such as "essential" or "importantly," a component may not be strictly necessary for the application of the present invention.

[0062] The term "the above" or similar designations in the description of the invention and claims may refer to both singular and plural forms unless specifically limited otherwise. Furthermore, where a range is described in the embodiments, it is considered to include the invention with respect to individual values ​​within said range (unless otherwise stated), and is equivalent to describing each individual value constituting said range in the description of the invention. Additionally, regarding the steps constituting the method according to the embodiments, the steps may be performed in a suitable order unless explicitly stated or otherwise stated. The embodiments are not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms (e.g., etc.) in the embodiments is merely for the purpose of describing the embodiments in detail, and the scope of the embodiments is not limited by said examples or exemplary terms unless otherwise limited by the claims. Furthermore, a person skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and factors within the scope of the claims or equivalents to which they are added. Explanation of the symbols

[0063] 1: Cylindrical roller bearing 100: Inner ring 110: Inner ring raceway surface 120: First wall 130: Second wall 200: Outer ring 210: Outer ring track surface 300: Roller 400: Cage 500: Oil tap 510: 1st oil tap 520: 2nd oil tap 600: Oil hole 610: 1st oil hole 620: 2nd oil hole S: Axis A: Axial direction C: Circular direction

Claims

Claim 1 A cylindrical roller bearing comprising: an inner ring coupled to a shaft and having an inner ring raceway surface parallel to the circumferential direction of the shaft; an outer ring located on the outer side of the inner ring and having an outer ring raceway surface parallel to the inner ring raceway surface in the radially outward direction of the shaft; a plurality of rollers located between the inner ring raceway surface and the outer ring raceway surface; a cage located between the inner ring and the outer ring and maintaining the spacing between the plurality of rollers; a plurality of oil tabs formed on the inner ring at an angle along the axial direction; and an oil hole connecting the oil tabs and the inner ring raceway surface. Claim 2 A cylindrical roller bearing according to claim 1, wherein the oil tab comprises: an inlet of the oil tab open in the direction in which lubricating oil is sprayed; and an end of the oil tab located inside the inner ring; wherein the distance between the inlet of the oil tab and the shaft is closer than the distance between the end of the oil tab and the shaft. Claim 3 A cylindrical roller bearing according to claim 2, wherein the distance between the end of the oil tab and the shaft is closer than the distance between the inner ring raceway surface and the shaft. Claim 4 A cylindrical roller bearing according to claim 1, wherein the oil tab comprises a first oil tab; and a second oil tab adjacent to the first oil tab; wherein the first oil tab and the second oil tab are alternately spaced apart along the circumferential direction of the shaft, and the oil hole comprises a first oil hole connecting the first oil tab and a first end of the inner ring raceway surface; and a second oil hole connecting the second oil tab and a second end of the inner ring raceway surface. Claim 5 In claim 4, the inner ring further comprises: a first wall surface connected perpendicularly to a first end of the inner ring raceway surface; and a second wall surface connected perpendicularly to a second end of the inner ring raceway surface; wherein one end of a first oil hole connected to the first oil tap is located between the first wall surface and the inlet of the first oil tap with respect to the axial direction, and one end of a second oil hole connected to the second oil tap is located between the second wall surface and the end of the second oil tap with respect to the axial direction, a cylindrical roller bearing. Claim 6 In claim 5, the cylindrical roller bearing, wherein the position of the first wall surface and the second wall surface in the axial direction is between the inlet of the oil tap and the end of the oil tap.

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