Bearing unit and roller assembly including the same

Abstract

The present invention relates to a bearing unit and a roller assembly including the same, and more specifically, to a bearing unit and a roller assembly including the same capable of minimizing the axial clearance between the inner ring and the outer ring of a bearing that supports the rotational axis of a roller. A bearing unit according to one embodiment of the present invention comprises: a bearing portion including an inner ring coupled to a shaft and rotating together with the shaft, and an outer ring surrounding the inner ring so that the inner ring is positioned on the inner side; a moving portion positioned on one side of the bearing portion and moving the outer ring by applying an external force so that when the inner ring moves in a direction that separates from the inner side of the outer ring, the axial clearance between the inner ring and the outer ring is eliminated; and a supporting portion positioned on the other side of the bearing portion and fixed to the shaft, wherein when the moving portion applies the external force to one side of the outer ring, the supporting portion can support the other side of the outer ring.

Description

Technology Field

[0001] The present invention relates to a bearing unit and a roller assembly including the same, and more specifically, to a bearing unit and a roller assembly including the same capable of minimizing the axial clearance between the inner ring and the outer ring of a bearing that supports the rotational axis of a roller. Background Technology

[0003] Although secondary batteries have been applied in small-scale fields such as mobile devices and laptop computers, research directions have recently expanded to medium and large-scale fields, and they are widely used in fields requiring high voltage and large capacity, such as Energy Storage Systems (ESS) and Electric Vehicles (EV). Battery packs can be formed by packaging battery cells made of these secondary batteries.

[0004] In the manufacturing process of such secondary batteries, a roller assembly may be utilized, comprising rollers for rolling or conveying specific sheets, a shaft extending from the rollers, and a bearing supporting the shaft. For example, when manufacturing a dry electrode, powder fed between a pair of roller assemblies may be compressed and molded by the rollers to produce a sheet-shaped electrode. Alternatively, the sheet-shaped electrode fed between the pair of roller assemblies may be conveyed in the direction of rotation of the rollers.

[0005] Meanwhile, during the manufacturing process of secondary batteries, powders or electrodes are often heated to a predetermined temperature to be molded or transported. As a result, thermal deformation, particularly thermal expansion, may occur in the rollers in the axial direction due to heat. When thermal expansion occurs in the rollers, thermal stress may be applied to the bearings supporting the rollers, and such thermal stress can cause a decrease in bearing durability, increased fatigue, and a shortened lifespan.

[0006] In this case, if thermal expansion occurs in the roller, the components constituting the bearing may deviate from their rated positions, leading to a problem where the bearing clearance changes. Such changes in clearance can have a significant impact on electrodes with very small thicknesses.

[0007] In particular, there are cases where roller bearings must be used to support rollers, in which the internal rotating member has a cylindrical or truncated cone shape. However, when using bearings like roller bearings that cannot adequately support axial loads, the clearance between the inner and outer rings of the roller bearing increases or decreases beyond the set range due to the thermal expansion of the rollers. The clearance between the inner and outer rings of the roller bearing needs to be set within an appropriate range to distribute the load acting on the internal rotating member, optimize lubrication, and minimize noise and vibration. However, if this clearance increases beyond the set range, problems have arisen where excessive noise and vibration occur in the rollers, precision is reduced, and variations in electrode thickness occur. Alternatively, if this clearance decreases beyond the set range, excessive load is applied to the bearing, which can lead to reduced bearing durability and a shortened lifespan. The problem to be solved

[0009] The present invention has been devised to solve the above-mentioned problems, and the problem to be solved by the present invention relates to a bearing unit capable of minimizing the axial clearance between the inner ring and the outer ring of a bearing supporting the rotation axis of a roller, and a roller assembly including the same.

[0010] In addition, the present invention relates to a bearing unit capable of minimizing the axial clearance between the inner ring and the outer ring of a bearing without significantly altering the existing configuration, and a roller assembly including the same.

[0011] In addition, the present invention relates to a bearing unit capable of improving the durability or lifespan of a bearing supporting a roller, and a roller assembly including the same.

[0012] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below. means of solving the problem

[0014] To solve the above-mentioned problem, the bearing unit according to the present invention comprises: a bearing portion including an inner ring coupled to a shaft and rotating together with the shaft, and an outer ring surrounding the inner ring so that the inner ring is positioned on the inner side; a moving portion disposed on one side of the bearing portion and moving the outer ring by applying an external force so that when the inner ring moves in a direction that separates from the inner side of the outer ring, the axial clearance between the inner ring and the outer ring is eliminated; and a supporting portion disposed on the other side of the bearing portion and fixed to the shaft, wherein when the moving portion applies the external force to one side of the outer ring, the supporting portion can support the other side of the outer ring.

[0015] When the shaft undergoes thermal expansion, the inner ring may move in the axial direction of the shaft.

[0016] The bearing unit according to the present invention further includes a bearing housing that accommodates the bearing portion inside, and the outer surface of the outer ring can be inserted in close contact with the inner surface of the bearing housing.

[0017] The above external force may be greater than the frictional force between the outer ring and the bearing housing.

[0018] The moving part may include a fixed member that is fixed to the bearing housing and has threads formed on its inner surface, and a bolt member that is inserted into a hole surrounded by the threads and moves along the threads to apply the external force to the outer ring.

[0019] The above moving part may further include a motor that provides a driving force to rotate the bolt member.

[0020] The above moving part may further include an adapter, one side of which is fixed to the bolt member and the other side of which contacts the outer ring.

[0021] The above adapter may include a first adapter portion in contact with the outer ring and a second adapter portion extending from the first adapter portion toward the shaft and spaced apart from the inner ring.

[0022] The second adapter part can form a step difference with the first adapter part.

[0023] The distance between the first adapter part and the shaft may be greater than the distance between the second adapter part and the shaft.

[0024] The above-mentioned moving part can move along the axial direction of the shaft while being guided by the inner circumference of the bearing housing.

[0025] The above moving part includes a piston member that moves along the axial direction of the shaft and an adapter disposed at the end of the piston member facing the outer ring and moving together with the piston member, and when the piston member moves in a direction that approaches the outer ring, the adapter can come into contact with the outer ring.

[0026] The above piston member may have a ring shape through which the shaft passes.

[0027] The above bearing part may be a tapered roller bearing.

[0028] The bearing portion is composed of a pair, and the moving portion and the supporting portion may be arranged with the pair of bearing portions in between.

[0029] The moving part can apply an external force to one of the outer rings of the pair of bearing parts, and the supporting part can support the other outer ring of the pair of bearings.

[0030] The bearing unit according to the present invention may further include a distance adjusting member disposed between the pair of bearing parts and adjusting the distance between the pair of bearing parts.

[0031] The outer ring of each of the above pair of bearing parts can come into contact with each other.

[0032] To solve the above-mentioned problem, a roller assembly according to the present invention is a roller assembly for press-forming powder into a sheet-shaped electrode or for conveying a sheet-shaped electrode, comprising a roller, a shaft extending from the roller, and a bearing unit that rotatably supports the shaft, wherein the bearing unit comprises a bearing portion including an inner ring coupled to the shaft and rotating together with the shaft, and an outer ring surrounding the inner ring so that the inner ring is positioned on the inside, a moving portion disposed on one side of the bearing portion and which applies an external force to the outer ring to move it so that when the inner ring moves in a direction that separates from the inside of the outer ring, the axial clearance between the inner ring and the outer ring is eliminated, and a supporting portion disposed on the other side of the bearing portion and fixed to the shaft, wherein when the moving portion applies the external force to one side of the outer ring, the supporting portion can support the other side of the outer ring. Effects of the invention

[0034] The bearing unit according to the present invention and the roller assembly including the same have the effect of minimizing the axial clearance between the inner ring and the outer ring of a bearing that supports the rotation axis of a roller.

[0035] In addition, the present invention has the effect of minimizing the axial clearance between the inner ring and the outer ring of a bearing without significantly changing the existing configuration.

[0036] In addition, the present invention has the effect of improving the durability or lifespan of a bearing supporting a roller.

[0037] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings. Brief explanation of the drawing

[0039] FIG. 1 is a perspective view of a roller assembly according to the present invention. Figure 2 is a cross-sectional view according to 1-1 of Figure 1. FIG. 3 is a perspective view of a bearing part according to the present invention. Figure 4 is a magnified view of part A of Figure 2. Figure 5 is a magnified view of part B of Figure 4. Figure 6 is a diagram showing the state in which the inner ring has moved in Figure 5. FIG. 7 is a drawing showing the state in which the movable part in FIG. 6 applies an external force to the outer ring to eliminate the axial clearance between the inner ring and the outer ring. Specific details for implementing the invention

[0040] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0041] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0042] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0044] FIG. 1 is a perspective view of a roller assembly according to the present invention, and FIG. 2 is a cross-sectional view according to 1-1 of FIG. 1.

[0045] Referring to FIGS. 1 and 2, a roller assembly (10) according to the present invention can be used to manufacture an electrode for a secondary battery and may include a roller (100), a shaft (200), and a bearing unit (300).

[0046] Although not shown in the drawing, a pair of roller assemblies (10) may be provided and may be arranged side by side to press powder into a sheet-shaped electrode or to transport the sheet-shaped electrode.

[0047] At this time, a predetermined space (hereinafter referred to as a gap) may be formed between a pair of roller assemblies (10) arranged side by side. Additionally, the rollers (100) of the pair of roller assemblies (10) may rotate in opposite directions to each other.

[0048] Powder that serves as a raw material for the electrode may be introduced into the gap. The powder is compressed by a pair of roller assemblies (10), and a sheet-shaped electrode may be manufactured. Here, the powder may be a slurry mixed with an electrode active material, a binder, a conductive material, etc.

[0049] A sheet-shaped electrode, which is the object to be transported, may be inserted into the gap. At this time, when the roller (100) of the roller assembly (10) rotates, both sides of the sheet-shaped electrode are respectively in close contact with the outer surface of a pair of rollers (100), and can be transported in a specific direction by friction with the roller (100).

[0050] Hereinafter, a roller assembly (10) according to the present invention will be described in detail.

[0051] The roller assembly (10) according to the present invention may include a roller (100). The roller (100) may have a cylindrical shape that is elongated in the front-rear direction (X-axis direction). At this time, the direction in which the roller (100) is arranged is not particularly limited.

[0052] Referring to FIG. 1, in the present invention, the central axis passing through the center along the longitudinal direction (X-axis direction) of the roller (100) may coincide with the rotation axis (hereinafter referred to as 'axis (C)') which is the center of rotation of the roller (100). That is, the roller (100) may rotate around the central axis. However, it is not limited thereto, and the axis (C) of the roller (100) may shift parallel to the central axis, so that the roller (100) may rotate eccentrically. For convenience of explanation, the central axis of the roller (100) and the axis (C) are described as coinciding below.

[0053] Meanwhile, the roller assembly (10) may include a heating unit (110). The heating unit (110) can apply heat to the roller (100). By doing so, the heating unit (110) can heat the powder formed by compression by the roller (100) or the sheet-shaped electrode conveyed by the roller (100) to a predetermined temperature or maintain the temperature within a specific range.

[0054] At this time, the heating unit (110) may be a heating device provided inside the roller (100). Alternatively, the heating unit (110) may be a fluid path provided inside the roller (100). High-temperature fluid may flow in the fluid path. However, the structure or type of the heating unit (110) is not particularly limited as long as it can apply heat to the roller (100).

[0055] The roller assembly (10) may include a shaft (200). The shaft (200) may extend from the roller (100). The shaft (200) may extend in an axial direction (X-axis direction) (hereinafter referred to as the axis (C) direction of the shaft (200)). The shaft (200) may be configured as a pair and provided on each side of the roller (100) in the longitudinal direction (X-axis direction).

[0056] The shaft (200) can transmit driving force to the roller (100) to rotate the roller (100). To this end, one side of the shaft (200) may be operatively connected to an actuator (not shown). Meanwhile, the shaft (200) and the roller (100) may share the same central axis, and accordingly, the central axis of the shaft (200) coincides with the axis (C), so that the shaft (200) can also rotate around the central axis. Therefore, the roller (100) and the shaft (200) can rotate concentrically together.

[0057] The roller assembly (10) according to the present invention may include a bearing unit (300).

[0058] The bearing unit (300) can be coupled to the shaft (200). Specifically, the bearing unit (300) can indirectly support the roller (100) by rotatably supporting the shaft (200).

[0059] The bearing unit (300) may be configured as a pair in a single roller assembly (10). A pair of bearing units (300) may each support a pair of shafts (200). Hereinafter, for convenience of explanation, one bearing unit (300) will be described.

[0060] The bearing unit (300) according to the present invention may include a bearing housing (310).

[0061] The bearing housing (310) forms the overall exterior of the bearing unit (300) and can accommodate the remaining components of the bearing unit (300) excluding the bearing housing (310) inside.

[0062] The bearing housing (310) may include a housing portion (311), a sealing portion (312), and a sealing cover portion (313).

[0063] The housing portion (311) may be manufactured from a material having a certain rigidity, such as metal or plastic. The housing portion (311) may surround the shaft (200) in the circumferential direction of the axis (C). The housing portion (311) may have a certain length in the direction extending along the axis (C) (X-axis direction).

[0064] As a result, a predetermined internal space may be formed between the inner side of the housing portion (311) and the outer surface of the shaft (200), and the remaining components of the bearing unit (300), excluding the bearing housing (310), may be accommodated in the internal space. Through this, the housing portion (311) can protect the remaining components of the bearing unit (300), excluding the bearing housing (310), from external impact or contamination.

[0065] Meanwhile, a certain fluid may be contained in the internal space of the housing part (311). For example, a lubricating fluid for the smooth operation of the bearing part (320, 1320) may be contained in the internal space. Therefore, the internal space needs to be isolated from the outside so that the fluid does not leak.

[0066] The sealing portion (312) can isolate the internal space from the outside, thereby preventing the fluid in the internal space from leaking out. That is, the sealing portion (312) may be a sealing member for isolating the internal space from the outside. For example, the sealing portion (312) may be an O-ring made of rubber or plastic, or a gasket made of an elastic material such as rubber or silicone. However, as long as the fluid in the internal space is not leaked out, the shape or material of the sealing portion (312) is not particularly limited.

[0067] The sealing portion (312) may be composed of a pair. A pair of sealing portions (312) may each be provided on both sides in the longitudinal direction (X-axis direction) of the housing portion (311). The sealing portion (312) may be formed in close contact with the outer surface of the shaft (200) or the roller (100). The sealing portion (312) can prevent fluid in the internal space from leaking to both sides in the longitudinal direction (X-axis direction) of the housing portion (311).

[0068] The sealing cover portion (313) can fix the position of the sealing portion (312) and prevent the sealing portion (312) from deviating from its proper position. The sealing cover portion (313) may have a socket structure into which the sealing portion (312) can be mounted or installed. The sealing cover portion (313) may be composed of a pair. A pair of sealing cover portions (313) can each fix a pair of sealing portions (312). The structure of the sealing cover portion (313) is not particularly limited as long as it can fix the sealing portion (312).

[0069] FIG. 3 is a perspective view of a bearing portion according to the present invention, FIG. 4 is a magnified view of portion A of FIG. 2, FIG. 5 is a magnified view of portion B of FIG. 4, FIG. 6 is a drawing showing the state in which the inner ring is moved in FIG. 5, and FIG. 7 is a drawing showing the state in which the movable part in FIG. 6 applies an external force to the outer ring to eliminate the axial clearance between the inner ring and the outer ring.

[0070] Referring to FIGS. 3 to 7, the bearing unit (300) according to the present invention may further include a bearing part (320, 1320), a moving part (330), and a supporting part (340).

[0071] The bearing portion (320, 1320) is configured to rotatably support the shaft (200) and can be accommodated in the internal space of the housing portion (311) of the bearing housing (310). At this time, when the roller (100) of a pair of roller assemblies (10) rolls or conveys a specific sheet, the load acting in the radial direction becomes greater than the axial direction on the bearing portion (320, 1320). Therefore, the bearing portion (320, 1320) may be a bearing that sufficiently supports the radial load even if it does not sufficiently support the axial load acting on the shaft (200). For example, the bearing portion (320, 1320) may be a tapered roller bearing in which the inner ring (321, 1321) is inserted into the outer ring (322, 1322). At this time, if the bearing portion (320, 1320) does not sufficiently support the axial load acting on the shaft (200), an excessive axial (C) direction clearance may occur between the inner ring (321, 1321) and the outer ring (322, 1322). The axial (C) direction clearance can be minimized by the moving portion (330) described later.

[0072] Meanwhile, the bearing unit (300) according to the present invention may be composed of one bearing part (first bearing (320) or second bearing (1320)) and a moving part (330) and a supporting part (340) respectively disposed on both sides of the one bearing part (first bearing (320) or second bearing (1320)).

[0073] However, alternatively, the bearing unit (300) according to the present invention may be composed of a pair of bearing parts (320, 1320) and a moving part (330) and a supporting part (340) respectively disposed on both sides of the pair of bearing parts (320, 1320) (see FIGS. 4 to 7). That is, the bearing parts (320, 1320) may be composed of a first bearing (320) and a second bearing (1320) disposed adjacent to each other, and a moving part (330) and a supporting part (340) may be respectively disposed on the outer sides of the first bearing (320) and the second bearing (1320). Specifically, the moving part (330) may be positioned on one side in the direction of the axis (C) of the shaft (200) from the first bearing (320), and the supporting part (340) may be positioned on the other side in the direction of the axis (C) of the shaft (200) from the second bearing (1320).

[0074] At this time, a distance adjustment unit (350) may be disposed between the first bearing (320) and the second bearing (1320), but the first bearing (320) and the second bearing (1320) may come into contact with each other. When the first bearing (320) and the second bearing (1320) come into contact with each other, the outer ring (322) of the first bearing (320) and the outer ring (1322) of the second bearing (1320) may come into contact with each other. In this case, if an external force is applied to either the outer ring (322) of the first bearing (320) or the outer ring (1322) of the second bearing (1320), the external force may be transmitted to the other one.

[0075] Meanwhile, the bearing unit (300) according to the present invention has the effect of minimizing the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) of the bearing part (320, 1320) without significantly changing the existing configuration by adding only the moving part (330) and the supporting part (340) to the existing configuration.

[0076] Below, the bearing part (320, 1320), the moving part (330), and the support part (340) will be described respectively.

[0077] Referring to FIG. 3, the bearing portion (320, 1320) may include an inner ring (321, 1321), an outer ring (322, 1322), a rotating member (323, 1323), and a holder (324, 1324).

[0078] The inner ring (321, 1321) is coupled to the shaft (200) and can rotate together with the shaft (200). At this time, since the shaft (200) rotates around the axis (C), the inner ring (321, 1321) can also rotate around the axis (C) of the shaft (200).

[0079] The inner ring (321, 1321) is fixed to the shaft (200) and can rotate together with the rotation of the shaft (200). The inner ring (321, 1321) may be formed in a ring shape, and the shaft (200) may be fitted and fixed to the inner side (321c, 1321c) of the inner ring (321, 1321) surrounded by the inner circumferential surface (321a, 1321a) of the inner ring (321, 1321). The inner ring (321, 1321) may be directly fixed to the shaft (200) by means such as welding, but is not limited thereto and may be fixed through a separate member.

[0080] When the shaft (200) and / or roller (100) undergo thermal expansion (TE), the direction in which the thermal expansion (TE) occurs may be the axis (C) direction of the shaft (200). Accordingly, when the shaft (200) and / or roller (100) undergo thermal expansion (TE), the inner ring (321, 1321) may move together with the shaft (200) in the axis (C) direction of the shaft (200).

[0081] The outer ring (322, 1322) can wrap around the inner ring (321, 1321). Specifically, the inner surface (322a, 1322a) of the outer ring (322, 1322) can wrap around the outer surface (321b, 1321b) of the inner ring (321, 1321) in a spaced-away manner. To this end, the outer ring (322, 1322) can be formed in a ring shape, and the inner diameter of the outer ring (322, 1322) can be larger than the outer diameter of the inner ring (321, 1321).

[0082] An inner ring (321, 1321), a rotating member (323, 1323), and a holder (324, 1324) may be disposed on the inner side (322c, 1322c) of the outer ring (322, 1322). Specifically, a holder (324, 1324) may be disposed on the inner side (322c, 1322c) of the outer ring (322, 1322), and an inner ring (321, 1321) may be disposed on the inner side of the holder (324, 1324). At this time, the inner side (322c, 1322c) of the outer ring (322, 1322) may refer to a space enclosed by the inner circumferential surface (322a, 1322a) of the outer ring (322, 1322).

[0083] The outer ring (322, 1322) can be inserted in close contact with the housing portion (311) of the bearing housing (310). Here, being inserted in close contact means that the outer ring (322, 1322) is inserted when it is supported by the housing portion (311) to the extent that the outer surface (322b, 1322b) of the outer ring (322, 1322) comes into direct contact with the inner surface of the housing portion (311) and frictional force acts between them.

[0084] The outer ring (322, 1322) has its outer surface (322b, 1322b) supported by the housing portion (311) of the bearing housing (310) and may not be fixed to the inner ring (321, 1321). Therefore, even if the shaft (200) and the inner ring (321, 1321) rotate, the outer ring (322, 1322) may not rotate because it is supported by the housing portion (311).

[0085] As described above, when the shaft (200) and / or roller (100) undergo thermal expansion (TE), the inner ring (321, 1321) can move together with the shaft (200) in the direction of the shaft (200) axis (C). Here, since the outer ring (322, 1322) is fixed in a state of being tightly inserted into the bearing housing (310), when the shaft (200) and / or roller (100) undergo thermal expansion (TE) and the inner ring (321, 1321) moves, the inner ring (321, 1321) moves in a direction that separates from the inner side of the outer ring (322, 1322).

[0086] The rotating member (323, 1323) can support the inner ring (321, 1321) so as to be rotatable relative to the outer ring (322, 1322). The rotating member (323, 1323) is positioned between the inner ring (321, 1321) and the outer ring (322, 1322) and can indirectly connect the inner ring (321, 1321) and the outer ring (322, 1322). The rotating member (323, 1323) may have a cylindrical or truncated cone shape, but its shape is not particularly limited.

[0087] A holder (324, 1324) is positioned between an inner ring (321, 1321) and an outer ring (322, 1322) and can rotatably support a rotating member (323, 1323). A space for receiving the rotating member (323, 1323) may be provided in the holder (324, 1324), and the rotating member (323, 1323) received in the space may roll while in contact with the inner ring (321, 1321) and the outer ring (322, 1322), respectively.

[0088] As described above, the bearing portion (320, 1320) may have a rotating member (323, 1323) having a cylindrical or truncated cone shape, and an inner ring (321, 1321) may be inserted into an outer ring (322, 1322). Through this, the bearing portion (320, 1320) can sufficiently support the radial load acting on the shaft (200). However, it may not sufficiently support the axial load acting on the shaft (200). Therefore, if the shaft (200) moves in the axial (C) direction (X-axis direction) due to thermal expansion (TE) of the roller (100) and / or shaft (200), the inner ring (321, 1321) moves in a direction that deviates from the inner side of the outer ring (322, 1322), and the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) increases, or an excessive load is applied to the outer ring (322, 1322), which may cause problems.

[0089] Accordingly, the moving part (330) according to the present invention can appropriately adjust the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322).

[0090] The axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) may mean the degree to which the axial (C) direction separation between the inner ring (321, 1321) and the outer ring (322, 1322) deviates from a preset separation.

[0091] Specifically, FIG. 5 shows a state in which the axial (C) direction clearance is eliminated (a state in which the axial (C) direction clearance is zero) by having the inner ring (321, 1321), the rotating member (323, 1323), and the holder (324, 1324) coupled in a fixed position to the outer ring (322, 1322), FIG. 6 shows a state in which the shaft (200) and / or the roller (100) undergo thermal expansion (TE) and the inner ring (321, 1321) moves a predetermined distance in the axial (C) direction, thereby creating an axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322).

[0092] Referring to FIG. 5, the state in which the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is removed may mean a state in which the relative positional change between the inner ring (321, 1321) and the outer ring (322, 1322) is restricted.

[0093] As a specific example, the state in which the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is eliminated may mean that when the bearing part (320, 1320) is a tapered roller bearing, both the inner ring (321, 1321) and the outer ring (322, 1322) are in contact with the rotating member (323, 1323).

[0094] Alternatively, the state in which the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is removed may mean a state in which the inner ring (321, 1321) and the outer ring (322, 1322) are coupled to each other in the correct position. At this time, the state in which the inner ring (321, 1321) and the outer ring (322, 1322) are coupled to each other in the correct position may mean a state in which both ends of the inner ring (321, 1321) in the axial (C) direction are positioned on the inner side (322c, 1322c) of the outer ring (322, 1322).

[0095] Referring to FIG. 6, the state in which an axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322) may mean a state in which a relative position change between the inner ring (321, 1321) and the outer ring (322, 1322) is possible.

[0096] As a specific example, the state in which an axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322) may mean that, when the bearing portion (320, 1320) is a tapered roller bearing, at least one of the inner ring (321, 1321) and the outer ring (322, 1322) is not in contact with the rotating member (323, 1323).

[0097] Alternatively, the state in which an axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322) may be a state in which the inner ring (321, 1321) is separated from the outer ring (322, 1322) by a predetermined distance in the axial (C) direction from its original position. Here, the original position may mean a state in which the rotating member (323, 1323) is in contact with the inner ring (321, 1321) and the outer ring (322, 1322), as shown in FIG. 5.

[0098] Alternatively, a state in which an axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322) may mean a state in which at least a part of the inner ring (321, 1321) is detached from the inner side (322c, 1322c) of the outer ring (322, 1322).

[0099] Alternatively, the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 132) may mean an axial (C) direction separation between the inner ring (321, 1321) and the outer ring (322, 1322). Alternatively, the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) may mean an axial (C) direction gap or clearance between the inner ring (321, 1321) and the outer ring (322, 1322). Therefore, a state in which the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is eliminated may mean a state in which the axial (C) direction gap or play between the inner ring (321, 1321) and the outer ring (322, 1322) is eliminated. In other words, a state in which the clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is zero may mean a state in which the axial (C) direction gap or play between the inner ring (321, 1321) and the outer ring (322, 1322) is zero. Additionally, the state in which an axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322) may mean a state in which an axial (C) direction gap or play occurs between the inner ring (321, 1321) and the outer ring (322, 1322).

[0100] The moving part (330) according to the present invention can minimize the gap between the inner ring (321, 1321) and the outer ring (1322, 1322) that hinders the smooth operation of the bearing unit (300) by eliminating the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322).

[0101] Meanwhile, the moving part (330) according to the present invention is disposed on one side of the bearing part (320, 1320), and when the inner ring (321, 1321) moves in a direction that deviates from the inner side (322c, 1322c) of the outer ring (322, 1322), an external force can be applied to the outer ring (322, 1322) to move it so that the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) is eliminated.

[0102] Specifically, when the shaft (200) and / or roller (100) undergo thermal expansion (TE) and an axial (C) clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322), the moving part (330) can move the outer ring (322, 1322) by pushing it so that the axial (C) clearance is removed.

[0103] For example, when the shaft (200) and / or roller (100) undergo thermal expansion (TE) and the inner ring (321, 1321) and / or outer ring (322, 1322) become separated from the rotating member (323, 1323), the moving part (330) can move the outer ring (322, 1322) by pushing it so that the inner ring (321, 1321) and the outer ring (322, 1322) come into contact with the rotating member (323, 1322).

[0104] In another example, when the shaft (200) and / or roller (100) undergo thermal expansion (TE) and the inner ring (321, 1321) moves in a direction that deviates from the inner side (322c, 1322c) of the outer ring (322, 1322), the moving part (330) can move the outer ring (322, 1322) by pushing it so that both ends of the inner ring (321, 1321) in the direction of the axis (C) are positioned on the inner side (322c, 1322c) of the outer ring (322, 1322).

[0105] Meanwhile, the moving part (330) may include a fixed member (331) and a bolt member (332).

[0106] The fixed member (331) is fixed to the inside of the bearing housing (310), and screw threads may be formed on its inner surface. Additionally, a hole surrounded by screw threads may be formed in the fixed member (331). The hole may extend in the direction of the axis (C) of the shaft (200).

[0107] The bolt member (332) is inserted into the hole surrounded by the screw threads and can apply an external force to the outer ring (322, 1322) while moving along the screw threads.

[0108] The bolt member (332) may include a bolt head (332a) and a bolt shaft (332b).

[0109] The bolt head (332a) is located on the outside of the fixing member (331) and can be connected to a motor (not shown) that provides driving force. At this time, the diameter of the bolt head (332a) may be larger than the diameter of the hole in the fixing member (331). This is to prevent the bolt head (332a) from being inserted into the hole of the fixing member (331) when the bolt member (332) is fastened to the fixing member (331).

[0110] The bolt shaft (332b) extends from the bolt head (332a), and threads may be formed on the outer surface of the bolt shaft (332b). The bolt shaft (332b) can move along the threads formed on the inner surface of the fixing member (331) by being inserted into the hole of the fixing member (331) and rotating. At this time, the length of the bolt shaft (332b) may be greater than the depth of the hole of the fixing member (331).

[0111] Additionally, since the hole of the fixed member (331) extends along the axis (C) direction of the shaft (200), when the bolt shaft (332b) reciprocates along the threads of the fixed member (331), it can reciprocate in the axis (C) direction of the shaft (200). At this time, since an adapter (333) can be fixed to the end of the bolt shaft (332b) facing the outer ring (322, 1322), when the bolt shaft (332b) is inserted into the hole and moved toward the outer ring (322, 1322), the adapter (333) can push and move the outer ring (322, 1322).

[0112] According to the present invention, the bolt member (332) can rotate and reciprocate in a straight line along the depth direction (X-axis direction) of the hole of the fixed member (331). That is, since the rotational motion of the bolt member (332) is converted into linear motion, the amount of linear motion of the bolt member (332) can be controlled more finely by adjusting the amount of rotation of the motor.

[0113] The support member (340) is positioned on the other side of the bearing member (320, 1320) and can be fixed to the shaft (200). The support member (340) can be positioned on the opposite side of the moving member (330) relative to the bearing member (320, 1320).

[0114] One side (340a) of the support member (340) faces the outer ring (322, 1322), and the other side (340b) of the support member (340) can be joined to the shaft (200) through a shrink-fitting process. At this time, the surface of the one side (340a) of the support member (340) facing the outer ring (322, 1322) can be formed in a flat shape corresponding to the surface of the outer ring (322, 1322). Additionally, the surface area of ​​the one side (340a) of the support member (340) facing the outer ring (322, 1322) can be formed to be equal to or smaller than the surface area of ​​the outer ring (322, 1322).

[0115] Since the support member (340) is fixed to the shaft (200), it can move together with the shaft (200). That is, when the shaft (200) moves in the axial direction (C) due to thermal expansion (TE), the support member (340) can move in the axial direction (C) while remaining fixed to the shaft (200).

[0116] Meanwhile, when the moving part (330) applies an external force to one side of the outer ring (322, 1322), the supporting part (340) can support the other side of the outer ring (322, 1322).

[0117] Specifically, when thermal expansion (TE) of the shaft (200) and / or roller (100) occurs, causing an axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322), the support member (340) also moves along the shaft (200) in the axial (C) direction. At this time, since the support member (340) moves by the same distance as the inner ring (321, 1321) moved in the axial (C) direction, when the moving member (330) pushes one side of the outer ring (322, 1322) to remove the axial (C) direction clearance, the support member (340) supports the other side of the outer ring (322, 1322) on the opposite side of the moving member (330). That is, from the moment the clearance in the axis (C) direction is removed, the outer ring (322, 1322) is supported by the support member (340), so it no longer moves in the axis (C) direction of the shaft (200).

[0118] Accordingly, the support member (340) may be configured to support the outer ring (322, 1322) on the opposite side in response to the external force applied by the moving member (330), but at the same time, it may be configured so that the outer ring (322, 1322) is not continuously pushed in the axis (C) direction of the shaft (200) after the moving member (330) removes the clearance in the axis (C) direction.

[0119] At this time, when the shaft (200) rotates while one side (340a) of the support member (340) is in contact with the other side of the outer ring (322, 1322), a problem may occur where the one side (340a) of the support member (340) and the other side of the outer ring (322, 1322) are scratched or damaged by each other. Therefore, a coating layer that minimizes friction may be formed on the one side (340a) of the support member (340) and / or the other side of the outer ring (322, 1322). At this time, the coating layer may include a component that satisfies low friction. For example, the coating layer may include PTFE or DLC.

[0120] Therefore, even when the shaft (200) rotates due to the coating layer, the support member (340) can move smoothly across the surface of the outer ring (322, 1322), so that damage between them can be minimized.

[0121] Meanwhile, since the bearing portion (320, 1320) of the bearing unit (300) according to the present invention may be composed of one or a pair, the configuration in which the moving portion (330) and the supporting portion (340) come into contact may be different in each case.

[0122] For example, when the bearing portion (320, 1320) is composed of one bearing portion (first bearing (320) or second bearing (1320)), if the moving portion (330) applies an external force to one side of the outer ring (322) of the first bearing (320) (or the outer ring (1322) of the second bearing (1320)), the supporting portion (340) can support the other side of the outer ring (322) of the first bearing (320) (or the outer ring (1322) of the second bearing (1320)).

[0123] As another example, when the bearing portion (320, 1320) is composed of a first bearing (320) and a second bearing (1320), when the moving portion (330) applies an external force to one side of the outer ring (322) of the first bearing (320), the supporting portion (340) can support the other side of the outer ring (1322) of the second bearing (1320) (see FIG. 7). Specifically, when the moving part (330) applies an external force to one side of the outer ring (322) of the first bearing (320), the distance adjustment part (350), which contacts the first bearing (320) and the second bearing (1320) respectively, transmits the external force to the outer ring (1322) of the second bearing (1320), and the support part (340) can support the outer ring (1322) of the second bearing (1320) in response to the external force on the opposite side of the moving part (330). In contrast, when the distance adjustment part (350) is not provided and the outer ring (322) of the first bearing (320) and the outer ring (1322) of the second bearing (1320) come into contact with each other, when the moving part (330) applies an external force to one side of the outer ring (322) of the first bearing (320), the outer ring (322) of the first bearing (320) transmits the external force to the outer ring (1322) of the second bearing (1320), and the supporting part (340) can support the outer ring (1322) of the second bearing (1320) in response to the external force on the opposite side of the moving part (330).

[0124] The moving part (330) according to the present invention may further include an adapter (333).

[0125] One side of the adapter (333) is fixed to the bolt member (332), and the other side can come into contact with the outer ring (322, 1322).

[0126] Specifically, when the bolt member (332) moves in a direction that approaches the outer ring (322, 1322), the adapter (333) can apply an external force to the outer ring (322, 1322). At this time, the adapter (331b, 332b) may be formed in a ring shape through which the shaft (200) passes, but the specific shape is not particularly limited.

[0127] The adapter (333) may include a first adapter part (333a) and a second adapter part (333b).

[0128] The first adapter part (333a) can support the outer ring (322, 1322) by contacting the outer ring (322, 1322).

[0129] The first adapter part (333a) may have a ring shape through which the shaft (200) passes. The first adapter part (333a) may have a predetermined thickness in the axis (C) direction (X-axis direction) of the shaft (200).

[0130] A portion of the first adapter part (333a) that contacts the outer ring (322, 1322) may be formed as a flat surface to stably support the outer ring (322, 1322). At this time, the flat surface of the outer ring (322, 1322) may be in a direction perpendicular to the axis (C) direction (X-axis direction) of the shaft (200) (Y-axis and Z-axis direction).

[0131] The second adapter portion (333b) extends from the first adapter portion (333a) toward the shaft (200) and may be spaced apart from the inner ring (321, 1321). The second adapter portion (333b) may have a ring shape through which the shaft (200) passes. The second adapter portion (333b) may have a predetermined thickness in the axis (C) direction (X-axis direction) of the shaft (200).

[0132] At least a portion of the second adapter part (333b) may be positioned to face the inner ring (321, 1321). At this time, at least a portion of the second adapter part (333b) facing the outer ring (322, 1322) may be positioned spaced apart from the inner ring (321, 1321). This configuration is intended to prevent the inner ring (321, 1321) of the first bearing (320) and the second adapter part (333b) from interfering with each other during the process of adjusting the clearance value of the bearing unit (300).

[0133] The second adapter part (333b) may form a step with the first adapter part (333a). Of course, the second adapter part (333b) may also be formed at an angle with the first adapter part (333a).

[0134] The first adapter part (333a) and the second adapter part (333b) may be spaced apart from the shaft (200). This is to prevent the shaft (200) and the adapters (331b, 332b) from interfering with each other when the shaft (200) rotates around the axis (C). To this end, the adapters (331b, 332b) may be inserted in close contact with the housing part (311) of the bearing housing (310).

[0135] The distance between the first adapter part (333a) and the shaft (200) may be greater than the distance between the second adapter part (333b) and the shaft (200). Through this, the first adapter part (333a) does not come into contact with the inner ring (321, 1321), so the external force can be concentrated only on the outer ring (322, 1322).

[0136] Alternatively, the roller assembly (10) according to the present invention may be configured such that a portion of the bolt member (332) contacts the outer ring (322) of the first bearing (320), while the remaining portion does not contact the inner ring (321) of the first bearing (320). In this case, the bolt member (332) does not contact the inner ring (321), so it may not hinder the rotation of the inner ring (321). In this embodiment, even if the adapter (333) is not provided, the bolt member (332) can move the outer ring (322, 1322) by pushing it in the direction of the shaft axis (C) (X-axis direction).

[0137] Meanwhile, as another embodiment, the moving part (330) of the bearing part (320, 1320) according to the present invention can move along the axis (C) direction of the shaft (200) while being guided by the inner circumference of the bearing housing (310). In this case, the moving part (330) can move by pushing the outer ring (322, 1322) while moving in the axis (C) direction of the shaft (200) by receiving driving force from a motor and / or servo valve.

[0138] In another embodiment, the moving part (330) of the bearing part (320, 1320) according to the present invention may include a piston member (not shown) and an adapter (not shown). In this case, the piston member may have a ring shape through which the shaft (200) passes, and may move along the axis (C) direction of the shaft (200) by receiving driving force from the driving force of a motor or servo valve. Additionally, the adapter is positioned at the end of the piston member facing the outer ring (322, 1322) and may move together with the piston member. In this case, when the piston member moves in a direction that approaches the outer ring (322, 1322), the adapter may come into contact with the outer ring (322, 1322).

[0139] Meanwhile, referring to FIGS. 4 to 7, the bearing unit (300) according to the present invention may further include a distance adjustment unit (350).

[0140] The distance adjustment unit (350) may include a first distance adjustment member (351), a second distance adjustment member (352), and a third distance adjustment member (353).

[0141] The first distance adjustment member (351) is positioned between a pair of bearing parts (320, 1320) and can adjust the distance between adjacent pairs of bearing parts (320, 1320). Specifically, the first distance adjustment member (351) is positioned between a pair of outer rings (322, 1322) and can adjust the distance between adjacent pairs of outer rings (322, 1322).

[0142] The first distance adjustment member (351) may have a ring or cylinder shape through which the shaft (200) passes. The diameter of the first distance adjustment member (351) may correspond to the outer ring (322, 1322) of the bearing portion (320, 1320). Here, "corresponds" means that the outer diameter of the first distance adjustment member (351) is the same as the outer diameter of the outer ring (322, 1322), and the inner diameter of the first distance adjustment member (351) is larger than or equal to the inner diameter of the outer ring (322, 1322). Thus, the first distance adjustment member (351) may not interfere with the rotation of the inner ring (321, 1321).

[0143] At this time, the first distance adjustment member (351) may have a predetermined length in the axis (C) direction (X-axis direction). Both sides of the length direction (X-axis direction) of the first distance adjustment member (351) may each come into contact with a pair of outer rings (322, 1322). The length of the first distance adjustment member (351) may function as the rated distance between the pair of outer rings (322, 1322).

[0144] Meanwhile, since the first distance adjustment member (351) is fitted onto the outer ring (322) of the first bearing (320) and the outer ring (1322) of the second bearing (1320), it can serve to transmit the external force to the other one when an external force is applied to either of the pair of outer rings (322, 1322). That is, when the moving part (330) applies an external force to the outer ring (322) of the first bearing (320) and pushes it, the first distance adjustment member (351) can transmit the external force to the outer ring (1322) of the second bearing (1320).

[0145] The second distance adjustment member (352) is positioned between a pair of bearing parts (320, 1320) and can adjust the distance between adjacent pairs of bearing parts (320, 1320). Specifically, the second distance adjustment member (352) is positioned between a pair of inner rings (321, 1321) and can adjust the distance between adjacent pairs of inner rings (321, 1321).

[0146] The second distance adjustment member (352) may have a ring or cylinder shape through which the shaft (200) passes. The diameter of the second distance adjustment member (352) may correspond to the inner ring (321, 1321) of the bearing portion (320, 1320). Corresponding here means that the inner diameter of the second distance adjustment member (352) is the same as the inner diameter of the inner ring (321, 1321), and the outer diameter of the second distance adjustment member (352) is smaller than or equal to the outer diameter of the inner ring (321, 1321). Thus, the second distance adjustment member (352) can rotate together with the inner ring (321, 1321) when the inner ring rotates, without being obstructed by the outer ring (322, 1322).

[0147] At this time, the second distance adjustment member (352) may have a predetermined length in the axis (C) direction (X-axis direction). Both sides of the second distance adjustment member (352) in the length direction (X-axis direction) may each come into contact with a pair of inner rings (321, 1321). The length of the second distance adjustment member (352) may function as the rated distance between the pair of inner rings (321, 1321).

[0148] The third distance adjustment member (353) is positioned between the bearing portion (320, 1320) and the roller (100) to adjust the distance between the bearing portion (320, 1320) and the roller (100). Specifically, the third distance adjustment member (353) is positioned between the inner ring (321) of the first bearing (320) and the roller (100) to adjust the distance between the inner ring (321) and the roller (100).

[0149] The third distance adjustment member (353) may have a ring or cylinder shape through which the shaft (200) passes. At this time, the diameter of the third distance adjustment member (353) may correspond to the inner ring (321) of the first bearing (320).

[0150] Meanwhile, the roller (100) may have an outer diameter larger than that of the shaft (200), and a step may be provided between the roller (100) and the shaft (200). The diameter of the third distance adjustment member (353) may be smaller than the outer diameter of the roller (100). Through this, the third distance adjustment member (353) is configured to engage with the step, thereby restricting movement toward the roller (100) side (in the X-axis direction).

[0151] The third distance adjustment member (353) may have a predetermined length in the direction of the axis (C) (X-axis direction). Both sides of the third distance adjustment member (353) in the longitudinal direction (X-axis direction) may contact the inner ring (321) of the first bearing (320) and the step, respectively. Specifically, one side of the third distance adjustment member (353) may be fixed to the inner ring (321) of the first bearing (320) or the step. When the third distance adjustment member (353) is fixed to the inner ring (321) of the first bearing (320), the first distance adjustment member (343) may move together with the inner ring (321). The length of the third distance adjustment member (353) may function as the rated distance between the inner ring (321) of the first bearing (320) and the roller (100).

[0152] Meanwhile, the distance adjustment unit (350) may be composed of ring or cylinder-shaped members, but the shape or structure of the distance adjustment unit (350) is not particularly limited as long as it can set the distance between the two components.

[0153] Meanwhile, the roller assembly (10) according to the present invention may further include a control unit (not shown) to minimize the axial (C) direction clearance value between the inner ring (321, 1321) and the outer ring (322, 1322).

[0154] The control unit can control the driving of the moving unit (330). Specifically, the control unit can control the movement of the moving unit (330) as it reciprocates along the axis (C) direction of the shaft (200). More specifically, the control unit can control a driving unit (not shown) connected to the bolt member (332). At this time, the driving unit may be at least one motor (not shown) that provides driving force to enable the bolt member (332) to rotate.

[0155] In addition, the roller assembly (10) according to the present invention may further include a temperature sensor (not shown).

[0156] A temperature sensor may be placed on the shaft (200) and / or roller (100) and may measure the temperature of the shaft (200) and / or roller (100).

[0157] At this time, the control unit can determine whether there is thermal expansion (TE) of the shaft (200) and / or roller (100) based on the temperature measured by the temperature sensor.

[0158] For example, if the temperature measured by the temperature sensor is above a preset temperature, the control unit determines that thermal expansion (TE) of the shaft (200) and / or roller (100) has occurred and can drive the drive unit connected to the bolt member (332). At this time, the preset temperature may be the temperature of the shaft (200) and / or roller (100) when the thermal expansion (TE) of the shaft (200) and / or roller (100) is completed. Additionally, the exact temperature value of the preset temperature may be experimentally determined based on the length, material, thickness, etc. of the shaft (200) and / or roller (100).

[0159] When the above thermal expansion (TE) occurs, the control unit may determine that the inner ring (321, 1321) moves in a direction that separates from the inner side of the outer ring (322, 1322), thereby causing an axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322). Accordingly, the control unit may drive the driving unit to remove the axial (C) direction clearance so that the moving unit (330) pushes the outer ring (322, 1322) of the first bearing (320).

[0160] As another example, at least one temperature sensor may be provided to measure the temperature of different regions of the shaft (200). In this case, if the multiple temperature values ​​measured by the temperature sensor are within a preset temperature range, the control unit may determine that the inner ring (321, 1321) moves in a direction that deviates from the inner side (322c, 1322c) of the outer ring (322, 1322), thereby causing an axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322).

[0161] At this time, the preset temperature range may be within the approximate range of the temperature of the shaft (200) and / or roller (100) when the thermal expansion (TE) of the shaft (200) and / or roller (100) is completed. That is, if multiple temperatures measured in the different regions converge within the preset temperature range, it means that the overall temperature of the shaft (200) and / or roller (100) has risen to a similar temperature, which may mean that the thermal expansion (TE) due to heating of the shaft (200) and / or roller (100) is completed. At this time, the exact temperature range value of the preset temperature range may be experimentally determined according to the length, material, thickness, etc. of the shaft (200) and / or roller (100).

[0162] When the above thermal expansion (TE) occurs, the control unit may determine that the inner ring (321, 1321) moves in a direction that separates from the inner side of the outer ring (322, 1322), thereby causing an axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322). Accordingly, the control unit may drive the driving unit to push the outer ring (322, 1322) of the first bearing (320) to the moving unit (330) in order to remove the axial (C) direction clearance.

[0163] Meanwhile, below, with reference to FIGS. 5 to 7, the process of minimizing the clearance value of the bearing unit (300) according to the present invention will be specifically explained.

[0164] The moving part (330) according to the present invention can minimize the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) for smooth operation of the bearing unit (300). That is, since the axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322) caused by thermal expansion (TE) of the shaft (200) and / or roller (100) can cause problems in the normal operation of the bearing unit (300), it is necessary to minimize the axial (C) direction clearance.

[0165] Specifically, FIG. 5 illustrates a state in which there is no axial (C) direction clearance between the inner ring (321, 1321) and the outer ring (322, 1322). The state in which there is no axial (C) direction clearance may be an initial state in which no thermal expansion (TE) of the shaft (200) and / or roller (100) occurs.

[0166] FIG. 6 illustrates a state (hereinafter referred to as the "first state") in which the shaft (200) and / or roller (100) of FIG. 5 undergo thermal expansion (TE) and the inner ring (321, 1321) moves in the axial (C) direction (X-axis direction). At this time, an excessive axial (C) direction clearance occurs between the inner ring (321, 1321) and the outer ring (322, 1322), so it is necessary to remove the excessive axial (C) direction clearance.

[0167] Meanwhile, if the temperature of the shaft (200) and / or roller (100) measured by the temperature sensor is above a preset temperature, or if the temperature measured by a plurality of temperature sensors is within a preset temperature range, the control unit may determine that the bearing unit (300) is in the first state.

[0168] FIG. 7 illustrates a state (hereinafter referred to as the "second state") in which a bolt member (332) pushes and moves (M) the outer ring (322) of the first bearing (320) to remove the excessive axial (C) direction clearance. At this time, the control unit can rotate the bolt member (332) in a direction that moves closer to the outer ring (322) of the first bearing (320) by controlling the drive unit connected to the bolt member (332). Additionally, when the bolt member (332) pushes the outer ring (322) of the first bearing (320) in the axial (C) direction, the outer ring (322) of the first bearing (320) pushes the first distance adjustment member (351), and the first distance adjustment member (351) can push the outer ring (1322) of the second bearing (1320).

[0169] In the second state above, the support member (340) can support the outer ring (1322) of the second bearing (1320) on the opposite side of the moving member (330) relative to the bearing member (320, 1320). At this time, one side (340a) of the support member (340) can support the outer ring (1322) of the second bearing (1320).

[0170] Additionally, since a first distance adjustment member (351) is disposed between the outer ring (322) of the first bearing (320) and the outer ring (1322) of the second bearing (1320), when the bolt member (332) applies an external force to the outer ring (322) of the first bearing (320), the first distance adjustment member (351) can transmit the external force to the outer ring (1322) of the second bearing (1320). At this time, the external force may be greater than the frictional force acting between the outer ring (322) of the first bearing (320) and the housing part (311) and the frictional force acting between the outer ring (1322) of the second bearing (1320) and the housing part (311).

[0172] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0174] 10: Roller assembly 100: Roller 110: Heating unit 200: Shaft 300: Bearing unit 310: Bearing housing 320, 1320: Bearing section 330: Moving part 340: Support 350: Distance adjustment unit

Claims

Claim 1 A bearing unit comprising: a bearing portion including an inner ring coupled to a shaft and rotating together with the shaft, and an outer ring surrounding the inner ring so that the inner ring is positioned on the inner side; a moving portion disposed on one side of the bearing portion and moving the outer ring by applying an external force to the outer ring so that when the inner ring moves in a direction that separates from the inner side of the outer ring, the axial clearance between the inner ring and the outer ring is eliminated; and a supporting portion disposed on the other side of the bearing portion and fixed to the shaft, wherein when the moving portion applies the external force to one side of the outer ring, the supporting portion supports the other side of the outer ring. Claim 2 In claim 1, when the shaft undergoes thermal expansion, the inner ring is a bearing unit that moves in the axial direction of the shaft. Claim 3 A bearing unit according to claim 1, further comprising a bearing housing that accommodates the bearing portion therein, wherein the outer surface of the outer ring is inserted in close contact with the inner surface of the bearing housing. Claim 4 In paragraph 3, the above external force is greater than the frictional force between the outer ring and the bearing housing in the bearing unit. Claim 5 In paragraph 3, the movable part comprises: a fixed member fixed to the bearing housing and having threads formed on its inner surface; and a bolt member inserted into a hole surrounded by the threads and moving along the threads to apply the external force to the outer ring. Claim 6 In paragraph 5, the moving part further comprises a bearing unit including a motor that provides a driving force to rotate the bolt member. Claim 7 In claim 5, the above-mentioned moving part further comprises an adapter having one side fixed to the bolt member and the other side in contact with the outer ring, forming a bearing unit. Claim 8 In claim 7, the adapter comprises a first adapter portion in contact with the outer ring; and a second adapter portion extending from the first adapter portion toward the shaft and spaced apart from the inner ring, forming a bearing unit. Claim 9 In claim 8, the second adapter part is a bearing unit that forms a step with the first adapter part. Claim 10 In claim 8, the distance between the first adapter part and the shaft is greater than the distance between the second adapter part and the shaft, in the bearing unit. Claim 11 In paragraph 3, the moving part is a bearing unit that moves along the axial direction of the shaft while being guided by the inner circumference of the bearing housing. Claim 12 In claim 1, the moving part comprises: a piston member that moves along the axial direction of the shaft; and an adapter disposed at the end of the piston member facing the outer ring and moving together with the piston member, wherein when the piston member moves in a direction toward the outer ring, the adapter contacts the outer ring. Claim 13 In Clause 12, the piston member is a bearing unit having a ring shape through which the shaft passes. Claim 14 In claim 1, the bearing portion is a bearing unit that is a tapered roller bearing. Claim 15 In claim 1, the bearing portion is composed of a pair, and the moving portion and the supporting portion are arranged with the pair of bearing portions in between, forming a bearing unit. Claim 16 In claim 15, the moving part applies an external force to the outer ring of one of the pair of bearing parts, and the supporting part supports the outer ring of the other of the pair of bearings. Claim 17 A bearing unit according to claim 15, further comprising a distance adjusting member disposed between the pair of bearing members and adjusting the distance between the pair of bearing members. Claim 18 In item 15, the outer ring of each of the above pair of bearing parts is a bearing unit in contact with each other. Claim 19 A roller assembly for press-forming powder into a sheet-shaped electrode or for conveying a sheet-shaped electrode, comprising: a roller; a shaft extending from the roller; and a bearing unit rotatably supporting the shaft, wherein the bearing unit comprises: a bearing portion including an inner ring coupled to the shaft and rotating together with the shaft, and an outer ring surrounding the inner ring so that the inner ring is positioned on the inside; a moving portion disposed on one side of the bearing portion and moving the outer ring by applying an external force to the outer ring so that when the inner ring moves in a direction that separates from the inside of the outer ring, the axial clearance between the inner ring and the outer ring is eliminated; and a support portion disposed on the other side of the bearing portion and fixed to the shaft, wherein when the moving portion applies the external force to one side of the outer ring, the support portion supports the other side of the outer ring.

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