Bearing structure and bearing mounting method

Abstract

The present disclosure aims to provide a bearing structure and a bearing mounting method that can obtain the necessary adhesive strength using a sufficient amount of adhesive and prevent the adhesive from adhering to undesirable locations. [Solution] The bearing structure 1 according to this disclosure comprises a shaft body 10, a bearing 100, and an adhesive 50. The bearing 100 is positioned on the shaft body 10, covering each fixing groove 20 and each storage groove 30, which are filled with adhesive 50. At least a portion of the space surrounded by the inner circumferential surface 100a of the bearing 100 and each storage groove 30 is hollow.

Description

Technical Field

[0001] The present disclosure relates to a bearing structure and a method for attaching a bearing.

Background Art

[0002] Conventionally, in order to sufficiently ensure the adhesive strength between a bearing and a rotating shaft, a plurality of holding grooves extending in the axial direction are formed on the circumferential surface of the rotating shaft, an adhesive is held in the plurality of holding grooves, and a bearing structure that fixes the rotating shaft and the bearing to each other with this adhesive is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional bearing structure, in order to obtain the required adhesive strength, it was necessary to hold a sufficient amount of adhesive in each holding groove. However, in such a case, the adhesive held in each holding groove might be pushed out to the outside by the bearing from the adhesive surface between the rotating shaft and the bearing and overflow. Thus, problems such as the pushed-out adhesive adhering to unwanted locations and affecting other members have occurred.

[0005] An object of the present disclosure is to provide a bearing structure and a method for attaching a bearing that can obtain the required adhesive strength using a necessary and sufficient amount of adhesive and prevent the adhesive from adhering to unwanted locations.

Means for Solving the Problems

[0006] The bearing structure according to this disclosure comprises a shaft body, a bearing disposed on the shaft body, and an adhesive for fixing the shaft body and the bearing to each other. The shaft body has one or more fixing grooves formed in a direction along the outer circumference of the shaft body, and a storage groove corresponding to each fixing groove. The bearing is disposed on the shaft body, covering each fixing groove and each storage groove, which are filled with adhesive. At least a portion of the space enclosed by the inner circumferential surface of the bearing and each storage groove is hollow.

[0007] The bearing mounting method according to this disclosure comprises a preparation step of preparing a shaft body, a bearing, and an adhesive for fixing the shaft body and the bearing; a filling step of filling the shaft body prepared in the preparation step with the adhesive; a press-fitting step of press-fitting the shaft body into the inner circumference of the bearing after the filling step; and a curing step of curing the adhesive after the press-fitting step so that the shaft body and the bearing are fixed and positioned relative to each other. The shaft body prepared in the preparation step has one or more fixing grooves and corresponding storage grooves formed in the direction along the outer circumference of the shaft body; in the filling step, the adhesive is filled into each fixing groove; in the press-fitting step, the shaft body is press-fitted into the bearing until each fixing groove and each storage groove are covered by the bearing; and in the curing step, when the adhesive has cured, at least a portion of the space determined by the inner circumferential surface of the bearing and the storage grooves is void. [Effects of the Invention]

[0008] According to the bearing structure and bearing mounting method of this disclosure, the necessary adhesive strength can be obtained using a sufficient amount of adhesive, and the adhesive can be prevented from adhering to undesirable locations. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the bearing structure according to Embodiment 1. [Figure 2] This is a flowchart showing the method for attaching the bearing to the shaft body in Embodiment 1. [Figure 3] This is a schematic diagram showing the shapes of the fixing groove and the storage groove in Embodiment 2. [Figure 4] Figure 3 is a schematic diagram showing different shapes for the fixed groove and the storage groove. [Figure 5] Figure 3 is a schematic diagram showing different shapes for the fixed groove and the storage groove. [Figure 6] Figure 5 is a schematic diagram showing different shapes for the fixed groove and the storage groove. [Modes for carrying out the invention]

[0010] Embodiments of this disclosure will be described below with reference to the drawings. Embodiment 1. Figure 1 is a schematic diagram showing a bearing structure 1 according to Embodiment 1. The bearing structure 1 comprises a shaft body 10 which is a long rod-shaped member, a bearing 100 which is placed on the shaft body 10, and an adhesive 50 which fixes the shaft body 10 and the bearing 100 to each other.

[0011] The shaft body 10 is a hollow shaft made of metal. The shaft body 10 has a central axis L along its longitudinal direction. The shaft body 10 has a flange portion 11 that protrudes in the direction along the outer circumference of the shaft body 10.

[0012] The flange portion 11 is formed along a plane perpendicular to the central axis L. In this embodiment 1, the flange portion 11 is formed around the entire circumference of the outer circumference of the shaft body 10. However, the flange portion 11 does not have to be formed around the entire circumference of the outer circumference of the shaft body 10.

[0013] The shaft body 10 has a fixing groove 20 and a storage groove 30 formed along a plane perpendicular to the central axis L, in a direction along the outer circumference of the shaft body 10. The shaft body 10 has a flange portion 11, a storage groove 30, and a fixing groove 20 formed in the order of flange portion 11, storage groove 30, and fixing groove 20 in the direction along the central axis L.

[0014] The shapes of the fixing groove 20 and the storage groove 30 are not particularly limited. In the first embodiment, it is composed of a bottom surface and a pair of side walls rising from the sides facing the bottom surface. The fixing groove 20 and the storage groove 30 composed of the bottom surface and the pair of side walls can be easily formed on the outer periphery of the shaft body 10 by machining such as a lathe.

[0015] Each of the fixing groove 20 and the storage groove 30 is formed over the entire outer periphery of the shaft body 10. The space defined by the fixing groove 20, that is, the space surrounded by the fixing groove 20 is defined as the fixing space 20a. The space defined by the storage groove 30, that is, the space surrounded by the storage groove 30 is defined as the storage space 30a.

[0016] The direction along the central axis L of each of the fixing groove 20 and the storage groove 30 is defined as the width direction. The fixing groove 20 has a constant width throughout. The storage groove 30 has a constant width throughout. The width of the fixing groove 20 and the width of the storage groove 30 are equal to each other.

[0017] The fixing groove 20 and the storage groove 30 have a constant depth throughout. The depth of the fixing groove 20 and the depth of the storage groove 30 are equal to each other. The depth of the fixing groove 20 and the depth of the storage groove 30 are preferably 0.05 mm or more and 0.4 mm or less, and more preferably 0.1 mm or more and 0.3 mm or less.

[0018] Well-known bearings can be applied to the bearing 100. The bearing 100 has an inner peripheral surface 100a.

[0019] The adhesive 50 is an anaerobic adhesive. The anaerobic adhesive 50 has the property of curing by blocking oxygen or air, that is, by bringing the adhesive 50 into direct contact with the metal.

[0020] The bearing 100 is abutted against the flange portion 11 and is disposed on the shaft body 10 by covering the fixing groove 20 and the storage groove 30 with the inner peripheral surface 100a of the bearing 100. The adhesive 50 is filled in the fixing groove 20 and is cured in a state of being accumulated in a part of the storage groove 30.

[0021] As the adhesive 50 hardens, the shaft body 10 and the bearing 100 are fixed to each other. At least a portion of the space enclosed by the storage groove 30 and the inner circumferential surface 100a is hollow and filled with air or gas released from the adhesive 50.

[0022] Next, the manufacturing method of the bearing structure 1 in Embodiment 1, that is, the method of attaching the bearing 100 to the shaft body 10, will be described. Figure 2 is a flowchart showing the method of attaching the bearing 100 to the shaft body 10 in Embodiment 1.

[0023] <Preparation process> First, in step S01, a preparation process is carried out. The preparation process involves preparing the components that make up the bearing structure 1.

[0024] The worker prepares the shaft body 10, the bearing 100, and the adhesive 50 for fixing the shaft body 10 and the bearing 100 for the manufacture of the bearing structure 1. The shaft body 10 prepared in the preparation step is machined into the desired shape. That is, the shaft body 10 has already been machined and formed with the flange portion 11, the fixing groove 20, and the storage groove 30.

[0025] The prepared bearing 100 has been processed and assembled, and is complete as a single bearing unit.

[0026] The adhesive 50 is prepared in a state before curing. An anaerobic adhesive 50 is used. However, an adhesive 50 that cures when an additive is added may also be used. In that case, at least the additive is also prepared in the preparation step.

[0027] Furthermore, the adhesive 50 with the additive added may be prepared in the preparation step. If the adhesive 50 with the additive added is prepared in the preparation step, it is necessary to prepare the adhesive 50 in a state where it has sufficient fluidity so that the following filling, press-fitting, and curing steps can be carried out. This completes the preparation step. The process then proceeds to the next step.

[0028] <Filling process> In step S02, a filling process is carried out. The filling process is the process of filling the fixed space 20a defined by the fixed groove 20 with adhesive 50.

[0029] The worker fills the entire fixing groove 20 with adhesive 50. The adhesive 50 has a certain viscosity, and the worker can fill the fixing groove 20 by applying the adhesive 50.

[0030] The adhesive 50 filled into the fixing groove 20 hardens to obtain the necessary strength to fix the bearing 100 and the shaft body 10. Therefore, in the filling process, it is necessary to fill the fixing groove 20 with a sufficient amount of adhesive 50.

[0031] The amount of adhesive 50 to be filled into the fixing groove 20, i.e., the volume of adhesive 50, should preferably be greater than or equal to the volume of the space enclosed by the inner circumferential surface 100a and the fixing groove 20, i.e., the volume of the fixing space 20a. Once a sufficient amount of adhesive 50 has been filled into the fixing groove 20 by the worker, the preparation process is complete. The process then proceeds to the next step. The upper limit of the volume of adhesive 50 to be filled into the fixing groove 20 will be explained later.

[0032] Furthermore, if an adhesive 50 that hardens upon the addition of an additive is used, the additive must be added to the adhesive 50 in the stage prior to the filling process.

[0033] <Press-fitting process> In step S03, a press-fitting process is performed. The press-fitting process involves press-fitting the shaft body 10, which has undergone the filling process, into the bearing 100.

[0034] Since the shaft body 10 is press-fitted onto the inner circumference of the bearing 100, the outer dimensions of the shaft body 10 and the inner diameter of the bearing 100 are molded to appropriate dimensions. The worker aligns the inner circumference of the bearing 100 with the shaft body 10 and press-fits the shaft body 10 into the bearing 100. At this time, the bearing 100 moves along the central axis L.

[0035] The worker presses the shaft body 10 onto the inner circumference of the bearing 100 until the bearing 100 abuts against the flange portion 11. At this time, the inner circumferential surface 100a of the bearing 100 first covers the fixing groove 20, and finally covers both the fixing groove 20 and the storage groove 30.

[0036] At this time, any adhesive 50 that does not fit into the fixed space 20a is pushed out by the bearing 100 and accumulates in the storage groove 30. Therefore, the bearing 100 needs to move relative to the shaft body 10 so as to first cover the fixed groove 20 and then cover the storage groove 30.

[0037] The bonding strength between the bearing 100 and the shaft body 10 is determined by the fixing strength resulting from friction when the bearing 100 and the shaft body 10 are press-fitted together, and the adhesive strength obtained when the adhesive 50 fills the space surrounded by the inner circumferential surface 100a of the bearing 100 and the fixing groove 20 and hardens.

[0038] In other words, the adhesive strength between the shaft body 10 and the bearing 100 is set to be sufficiently obtained by the hardening of the adhesive 50 filled in the fixing groove 20. The adhesive strength between the shaft body 10 and the bearing 100 resulting from the hardening of the adhesive 50 extruded from the fixing groove 20 into the storage groove 30 is not particularly considered as part of the fixing strength between the bearing 100 and the shaft body 10.

[0039] Therefore, it is desirable that the amount of adhesive 50 filled into the fixing groove 20, i.e., the volume of adhesive 50, be smaller than the sum of the volume of the fixing space 20a and the volume of the storage space 30a. In other words, it is not necessary to fill the storage groove 30 with adhesive 50, and it is desirable that at least a part of the storage space 30a, which is the space enclosed by the inner circumferential surface 100a and the storage groove 30, be void. This void may be filled with air or gas generated from the adhesive 50.

[0040] This completes the press-fitting process. The process then proceeds to the next step.

[0041] <Curing process> In step S04, a curing process is carried out. The curing process is a process of thoroughly curing the adhesive 50.

[0042] The worker leaves the bearing 100 and shaft body 10, which have undergone the press-fitting process, to allow the adhesive 50 to fully cure. The bearing 100 and shaft body 10 may also be left in an environment that promotes the curing of the adhesive 50, for example, in a high-temperature environment. Once the adhesive 50 has fully cured, the shaft body 10 and the bearing 100 are fixed and positioned relative to each other.

[0043] Once the adhesive 50 has fully cured, the method for attaching the bearing 100 to the shaft body 10, i.e., the method for manufacturing the bearing structure 1, is complete.

[0044] In Embodiment 1, the shaft body 10 is hollow. However, it is not limited to this. For example, the configuration of this disclosure may be applied to a solid shaft body 10.

[0045] Furthermore, the shaft body 10 in Embodiment 1 is made of metal. However, it is not limited to this. For example, the configuration of this disclosure may be applied to the shaft body 10 made of a hard resin or the like.

[0046] Furthermore, in Embodiment 1, the depth of the fixing groove 20 and the depth of the storage groove 30 are equal to each other. However, this is not the only option. The depth of the fixing groove 20 and the depth of the storage groove 30 may each be set within an acceptable range.

[0047] Furthermore, in Embodiment 1, the width of the fixing groove 20 and the width of the storage groove 30 are equal. However, this is not the only option. That is, the width of the fixing groove 20 and the width of the storage groove 30 may be different. In that case, the width of the storage groove 30 is preferably 0.2 times or more and 2 times or less the width of the fixing groove 20, and more preferably 0.5 times or more and 1.2 times or less the width of the fixing groove 20.

[0048] Furthermore, the adhesive 50 in Embodiment 1 is anaerobic. However, it is not limited to this. Adhesives other than anaerobic adhesives may also be used.

[0049] Furthermore, in Embodiment 1, only one fixing groove 20 is formed. However, this is not the only option. For example, two or more fixing grooves 20 may be formed. By forming two or more fixing grooves 20, the fixing grooves 20 are dispersed along the central axis L, and a more uniform fixing strength can be obtained along the central axis L.

[0050] Furthermore, in Embodiment 1, only one storage groove 30 is formed. However, this is not the only option. In order to form one storage groove 30 for each of the two or more fixed grooves 20, two or more storage grooves 30 may be formed corresponding to each of the two or more fixed grooves 20. This ensures that the adhesive 50 extruded from the corresponding fixed groove 20 is reliably received by the storage groove 30, preventing the diffusion of the adhesive 50 extruded from the fixed groove 20 and the resulting contamination.

[0051] Furthermore, in Embodiment 1, the shaft body 10 has one storage groove 30 corresponding to one fixing groove 20. However, it is not limited to this. One storage groove 30 may be formed for two or more fixing grooves 20. By forming two or more fixing grooves 20, the fixing grooves 20 are dispersed along the central axis L, and a more uniform fixing strength can be obtained along the central axis L. Also, it is sufficient to form only one storage groove 30 for two or more corresponding fixing grooves 20, which can reduce the manufacturing cost of the shaft body 10. Even in this case, the volume of adhesive 50 to be filled into one fixing groove 20 is equal to or greater than the volume of the corresponding fixing space 20a in order to obtain the required adhesive strength. Furthermore, when one storage groove 30 and one or more fixing grooves 20 that one storage groove 30 corresponds to are considered as one set, in the filling process S02, the total volume of adhesive 50 to be filled into each fixing groove 20 constituting one set is smaller than the sum of the volumes of the corresponding fixing spaces 20a and the volume of the corresponding storage space 30a. This allows the adhesive 50 filled in one set to be stored in the corresponding storage groove 30 even if it is pushed out from each fixing groove 20.

[0052] Furthermore, in Embodiment 1, the shaft body 10 is press-fitted into the bearing 100 after the filling process. However, this is not the only method. For example, the shaft body 10 may be press-fitted into the bearing 100 until just before the bearing 100 covers the fixing groove 20, and then the filling process may be performed. Moreover, after the filling process has been performed, the shaft body 10 may be press-fitted into the bearing 100 as a press-fitting process so as to cover the fixing groove 20 and the storage groove 30.

[0053] The bearing structure 1 in Embodiment 1 comprises a shaft body 10, a bearing 100 disposed on the shaft body 10, and an adhesive 50 for fixing the shaft body 10 and the bearing 100 to each other. The shaft body 10 has one or more fixing grooves 20 formed in the direction along the outer circumference of the shaft body 10, and storage grooves 30 corresponding to each fixing groove 20. The bearing 100 is disposed on the shaft body 10, covering each fixing groove 20 and each storage groove 30, which are filled with adhesive 50. At least a portion of the space surrounded by the inner circumferential surface 100a of the bearing 100 and each storage groove 30 is hollow. As a result, the adhesive 50 filled in each fixing groove 20 hardens to obtain the required adhesive strength, and the adhesive 50 extruded from each fixing groove 20 accumulates and hardens in the corresponding storage groove 30. Therefore, in the bearing structure 1, the required adhesive strength can be obtained using a sufficient amount of adhesive 50, and the adhesive 50 can be prevented from adhering to undesirable locations. Furthermore, as a result, even when adhesive 50 extruded from each fixing groove 20 accumulates in the storage groove 30, a cavity is formed in some parts. Therefore, the adhesive 50 extruded from each fixing groove 20 accumulates in the storage groove 30, which has spatial leeway. Thus, the bearing structure 1 can better prevent the adhesive 50 from adhering to undesirable locations.

[0054] In the bearing structure 1 of Embodiment 1, the shaft body 10 is hollow and made of metal. As a result, even if the hollow shaft body 10, which is press-fitted into the bearing 100, deforms inward due to the tightening load during press-fitting, sufficient adhesive strength can be obtained by the adhesive 50 filled in the fixing groove 20. Therefore, a hollow shaft body 10 can be used depending on weight reduction or design requirements. Thus, the restrictions on the installation of the bearing 100 are relaxed, and the degree of design freedom in the bearing structure 1 can be increased.

[0055] In the bearing structure 1 of Embodiment 1, the adhesive 50 is an anaerobic adhesive. This allows the anaerobic adhesive 50 extruded from each fixing groove 20 to be held in the storage groove 30 and covered by the inner circumferential surface 100a of the bearing 100. Since the anaerobic adhesive 50 hardens when it is blocked from the outside air, when using the anaerobic adhesive 50 to fix parts, it is difficult to predict where the anaerobic adhesive 50 will flow and harden if it flows out from the desired location, and countermeasures and responses to this require a lot of cost. However, in the bearing structure 1 of Embodiment 1, since the adhesive 50 accumulates in the storage groove 30, it does not flow out of the storage groove 30, and adhesion of the adhesive 50 to undesirable locations can be further prevented. Therefore, the cost of manufacturing the bearing structure 1 can be reduced.

[0056] In the bearing structure 1 of Embodiment 1, the depth of each fixing groove 20 and the depth of each storage groove 30 are equal. This allows each fixing groove 20 and each storage groove 30 to be designed and manufactured as grooves of similar depth. Therefore, the design and manufacturing costs of the bearing structure 1 can be reduced. Furthermore, this ensures that the anaerobic adhesive 50 is cured reliably. That is, the depth of the fixing groove 20 is a depth that ensures the anaerobic adhesive 50 is cured reliably. By applying this depth to the depth of the storage groove 30, even if there is a void in part of the storage groove 30, outside air reaching the adhesive 50 can be effectively blocked. Therefore, not only the adhesive 50 filled in the fixing groove 20, but also the adhesive 50 accumulated in the storage groove 30 can be reliably cured. Thus, in the bearing structure 1, the necessary adhesive strength can be obtained using a sufficient amount of adhesive 50, and adhesion of the adhesive 50 to undesirable locations can be further prevented.

[0057] In the bearing structure 1 of Embodiment 1, each fixing groove 20 and each storage groove 30 are formed around the entire circumference of the outer circumference of the shaft body 10. This allows each fixing groove 20 and each storage groove 30 to be easily formed by turning. Therefore, the design and manufacturing costs of the bearing structure 1 can be reduced.

[0058] In the bearing structure 1 of Embodiment 1, the depth of each fixing groove 20 and each storage groove 30 is 0.05 mm to 0.4 mm. This provides an environment in which the anaerobic adhesive 50 filled in each fixing groove 20 and the anaerobic adhesive 50 accumulated in each storage groove 30 can be sufficiently sealed off from the outside air. Therefore, the anaerobic adhesive 50 can be sufficiently cured. Thus, the required adhesive strength can be more reliably obtained using a sufficient amount of adhesive 50, and adhesion of the adhesive 50 to undesirable locations can be better prevented.

[0059] In the bearing structure 1 of Embodiment 1, the width of each storage groove 30 along the longitudinal direction of the shaft body 10 is 0.2 times or more and 2 times or less the width of the corresponding fixing groove 20 along the longitudinal direction of the shaft body 10. This ensures that the adhesive 50 overflowing from each fixing groove 20 is reliably collected in each storage groove 30. Therefore, adhesion of the adhesive 50 to undesirable locations can be more effectively prevented.

[0060] The method for mounting the bearing 100 in Embodiment 1 includes a preparation step S01 in which a shaft body 10, a bearing 100, and an adhesive 50 for fixing the shaft body 10 and the bearing 100 are prepared. The method for mounting the bearing 100 further includes a filling step S02 in which the adhesive 50 is filled into the shaft body 10 prepared in preparation step S01. The method for mounting the bearing 100 further includes a press-fitting step S03 after the filling step S02 in which the shaft body 10 is press-fitted into the inner circumference of the bearing 100. The method for mounting the bearing 100 further includes a curing step S04 after the press-fitting step S03 in which the adhesive 50 is cured, and the shaft body 10 and the bearing 100 are fixed and positioned relative to each other. The shaft body 10 prepared in preparation step S01 has one or more fixing grooves 20 formed in the direction along the outer circumference of the shaft body 10, and storage grooves 30 corresponding to each fixing groove 20. Furthermore, in the filling step S02, adhesive 50 is filled into each fixing groove 20, and in the press-fitting step S03, the shaft body 10 is press-fitted into the bearing 100 until each fixing groove 20 and each storage groove 30 are covered by the bearing 100. In the curing step S04, once the adhesive 50 has cured, at least a portion of the space defined by the inner circumferential surface 100a of the bearing 100 and the storage groove 30 is void. As a result, the adhesive 50 filled into each fixing groove 20 hardens to obtain the required adhesive strength, and the adhesive 50 extruded from each fixing groove 20 accumulates and hardens in the corresponding storage groove 30. Therefore, in the bearing 100 mounting method, the required adhesive strength can be obtained using a sufficient amount of adhesive 50, and the adhesive 50 can be prevented from adhering to undesirable locations. Furthermore, as a result, even when the adhesive 50 extruded from each fixing groove 20 has accumulated in the storage groove 30, a void is formed in a portion of it. Therefore, the adhesive 50 extruded from each fixing groove 20 accumulates in the storage groove 30, which has ample space. Thus, in the method of installing the bearing 100, it is possible to better prevent the adhesive 50 from adhering to undesirable locations.

[0061] In the bearing mounting method of Embodiment 1, the space defined by each fixing groove 20 and the inner circumferential surface 100a is defined as the fixing space 20a, and the space defined by each storage groove 30 and the inner circumferential surface 100a is defined as the storage space 30a. Furthermore, in the filling step S02, the volume of adhesive 50 filled into each fixing groove 20 is equal to or greater than the volume of the corresponding fixing space 20a. Also, when one storage groove 30 and one or more fixing grooves 20 corresponding to one storage groove 30 are considered as one set, in the filling step S02, the total volume of adhesive 50 filled into each fixing groove 20 constituting the set is less than the sum of the volumes of the corresponding fixing spaces 20a and the volumes of the corresponding storage spaces 30a. This allows each fixing groove 20 to be filled with a sufficient amount of adhesive 50 to obtain the required adhesive hardness, while the adhesive 50 extruded from each fixing groove 20 is collected in the corresponding storage groove 30 without overflowing. Therefore, in the bearing mounting method, the required adhesive strength can be more reliably obtained using a sufficient amount of adhesive 50, and the adhesion of the adhesive 50 to undesirable locations can be better prevented.

[0062] In the bearing 100 mounting method of Embodiment 1, the shaft body 10 is hollow and made of metal. As a result, even if the hollow shaft body 10 is deformed during press-fitting into the bearing 100, sufficient adhesive strength can be obtained by the adhesive 50 filled in the fixing groove 20. Therefore, a hollow shaft body 10 can be used depending on weight reduction or design requirements. Thus, in the bearing 100 mounting method, the restrictions on the installation of the bearing 100 are relaxed, and the degree of design freedom in the bearing structure 1 can be increased.

[0063] In the bearing mounting method of Embodiment 1, the adhesive 50 is an anaerobic adhesive. This allows the anaerobic adhesive 50 extruded from each fixing groove 20 to be held in the storage groove 30 and covered by the inner circumferential surface 100a of the bearing 100. Since the anaerobic adhesive 50 hardens when it is blocked from the outside air, when using the anaerobic adhesive 50 to fix parts, it is difficult to predict where the anaerobic adhesive 50 will flow and harden if it flows out from the desired location, and countermeasures and responses required a lot of cost. However, in the bearing mounting method of Embodiment 1, since the adhesive 50 accumulates in the storage groove 30, it does not flow out of the storage groove 30, and adhesion of the adhesive 50 to undesirable locations can be further prevented. Therefore, costs can be reduced in the bearing mounting method.

[0064] In the bearing mounting method of Embodiment 1, the depth of each fixing groove 20 and the depth of each storage groove 30 are equal. This allows the shaft body 10 prepared in preparation step S01 to be designed and manufactured with each fixing groove 20 and each storage groove 30 having similar depths. Therefore, the design and manufacturing costs of the shaft body 10 can be reduced. Furthermore, this ensures that the anaerobic adhesive 50 is cured reliably. That is, the depth of the fixing groove 20 is a depth that ensures the anaerobic adhesive 50 is cured reliably. By applying this depth to the depth of the storage groove 30, even if there is a void in part of the storage groove 30, outside air reaching the adhesive 50 can be effectively blocked. Therefore, not only the adhesive 50 filled in the fixing groove 20, but also the adhesive 50 accumulated in the storage groove 30 can be reliably cured. Thus, the necessary adhesive strength can be obtained using a sufficient amount of adhesive 50, and adhesion of the adhesive 50 to undesirable locations can be further prevented.

[0065] In the bearing mounting method of Embodiment 1, the depth of each fixing groove 20 and each storage groove 30 is 0.05 mm to 0.4 mm. This provides an environment in which the anaerobic adhesive 50 filled in each fixing groove 20 and the anaerobic adhesive 50 accumulated in each storage groove 30 can be sufficiently sealed off from the outside air. Therefore, the anaerobic adhesive 50 can be sufficiently cured. Thus, the required adhesive strength can be more reliably obtained using a sufficient amount of adhesive 50, and adhesion of the adhesive 50 to undesirable locations can be better prevented.

[0066] Embodiment 2. In Embodiment 2, the shapes of the fixing groove 20 and the storage groove 30 differ from those of the fixing groove 20 and the storage groove 30 in Embodiment 1. Figure 3 is a schematic diagram showing the shapes of the fixing groove 20 and the storage groove 30 in Embodiment 2. Figure 3 shows the outer circumference of the shaft body 10 as it is laid out on the paper.

[0067] Each of the fixing groove 20 and the storage groove 30 has an annular, or C-shaped, form when viewed along the central axis L. Neither the fixing groove 20 nor the storage groove 30 is formed around the entire circumference of the shaft body 10; there are areas on the outer circumference of the shaft body 10 where neither the fixing groove 20 nor the storage groove 30 is formed.

[0068] When viewed along the central axis L, the fixing groove 20 and the storage groove 30 overlap completely. That is, the C-shaped fixing groove 20 and the storage groove 30 are formed facing each other. The other components of the bearing structure 1 are the same as those of the bearing structure 1 in Embodiment 1, so their description is omitted. Also, the method of mounting the bearing 100 is the same as the method of mounting the bearing 100 in Embodiment 1, so their description is omitted.

[0069] In Embodiment 2, the fixing groove 20 and the storage groove 30 overlap completely when viewed along the central axis L. However, this is not the only configuration. Figure 4 is a schematic diagram showing different shapes for the fixing groove 20 and the storage groove 30 in Figure 3. In Figure 4, the outer circumference of the shaft body 10 unfolded on the paper is shown, similar to Figure 3. As shown in Figure 4, the entire fixing groove 20 may overlap a part of the storage groove 30.

[0070] Furthermore, in Embodiment 2, the fixing groove 20 and the storage groove 30 are C-shaped when viewed along the central axis L. However, this is not the only possible configuration. Figure 5 is a schematic diagram showing different shapes for the fixing groove 20 and the storage groove 30 in Figure 3. In Figure 5, the outer circumference of the shaft body 10 unfolded on the paper is shown, similar to Figure 3. As shown in Figure 5, the fixing groove 20 and the storage groove 30 are each composed of two grooves. Even in this case, the fixing groove 20 and the storage groove 30 overlap completely when viewed along the central axis L. Note that the fixing groove 20 and the storage groove 30 may be composed of not just two, but three or more grooves.

[0071] Furthermore, in Embodiment 2, the fixing groove 20 and the storage groove 30 are C-shaped when viewed along the central axis L, and their entirety overlaps when viewed along the central axis L. However, this is not the only configuration. Figure 6 is a schematic diagram showing different shapes for the fixing groove 20 and the storage groove 30 in Figure 5. In Figure 6, the outer circumference of the shaft body 10 unfolded on the paper is shown, similar to Figure 3. As shown in Figure 6, the entirety of the fixing groove 20, which is divided into two grooves, may overlap a part of the corresponding storage groove 30, which is also divided into two grooves. Note that the fixing groove 20 and the storage groove 30 may each be divided into not just two, but three or more grooves.

[0072] In the bearing structure 1 of Embodiment 2, when viewed along the longitudinal axis of the shaft body 10, the entirety of each fixing groove 20 overlaps with the corresponding storage groove 30 in the direction along the outer circumference of the shaft body 10. As a result, when the shaft body 10 and the bearing 100 are pressed together by relative movement along the central axis L, the adhesive 50 extruded from each fixing groove 20 moves toward the storage groove 30 which overlaps with the entirety of the fixing groove 20. Therefore, the adhesive 50 extruded from each fixing groove 20 is reliably accumulated in the storage groove 30. Thus, adhesion of the adhesive 50 to undesirable locations can be further prevented.

[0073] In the bearing structure 1 of Embodiment 2, when viewed along the longitudinal axis of the shaft body 10, the entirety of each fixing groove 20 coincides with and overlaps with the entirety of the corresponding storage groove 30 in the direction along the outer circumference of the shaft body 10. As a result, each fixing groove 20 and each storage groove 30 can be designed and manufactured as grooves with similar circumferential length and position. Therefore, the design and manufacturing costs of the bearing structure 1 can be reduced.

[0074] In the bearing 100 mounting method of Embodiment 2, when viewed along the longitudinal axis of the shaft body 10, the entirety of each fixing groove 20 overlaps with the corresponding storage groove 30 in the direction along the outer circumference of the shaft body 10. As a result, when the shaft body 10 and the bearing 100 are pressed into place by relative movement along the central axis L, the adhesive 50 pushed out from each fixing groove 20 moves toward the storage groove 30 which overlaps with the entirety of the fixing groove 20. Therefore, the adhesive 50 pushed out from each fixing groove 20 is reliably accumulated in the storage groove 30. Thus, adhesion of the adhesive 50 to undesirable locations can be further prevented. [Explanation of Symbols]

[0075] 1 Bearing structure, 10 Shaft body, 11 Flange section, 20 Fixing groove, 20a Fixing space, 30 Storage groove, 30a Storage space, 50 Adhesive, 100 Bearing, 100a Inner circumferential surface, L Central axis.

Claims

1. The shaft body (10) and A bearing (100) is arranged on the shaft body (10), An adhesive (50) for fixing the shaft body (10) and the bearing (100) to each other, Equipped with, The shaft body (10) has one or more fixing grooves (20) formed in a direction along the outer circumference of the shaft body (10), and a storage groove (30) corresponding to each of the fixing grooves (20). The bearing (100) is positioned on the shaft body (10) so as to cover each of the fixing grooves (20) and each of the storage grooves (30) which are filled with the adhesive (50). At least a portion of the space enclosed by the inner circumferential surface (100a) of the bearing (100) and each of the storage grooves (30) is hollow. Bearing structure (1).

2. The shaft body (10) is hollow and made of metal. The bearing structure (1) according to claim 1.

3. The adhesive (50) is an anaerobic adhesive. The bearing structure (1) according to claim 2.

4. The depth of each of the aforementioned fixing grooves (20) and the depth of each of the aforementioned storage grooves (30) are equal to each other. The bearing structure (1) according to claim 3.

5. When viewed along the longitudinal axis of the shaft body (10), the entirety of each fixing groove (20) overlaps with the corresponding storage groove (30) in the direction along the outer circumference of the shaft body (10). The bearing structure (1) according to claim 4.

6. When viewed along the longitudinal axis of the shaft body (10), the entirety of each fixing groove (20) coincides with and overlaps with the entirety of the corresponding storage groove (30) in the direction along the outer circumference of the shaft body (10). The bearing structure (1) according to claim 5.

7. Each of the aforementioned fixing grooves (20) and each of the aforementioned storage grooves (30) is formed around the entire circumference of the outer circumference of the shaft body (10). The bearing structure (1) according to claim 6.

8. The depth of each of the aforementioned fixing grooves (20) and each of the aforementioned storage grooves (30) is 0.05 mm to 0.4 mm. The bearing structure (1) according to any one of claims 1 to 7.

9. The width of each of the storage grooves (30) along the longitudinal direction of the shaft body (10) is 0.2 times or more and 2 times or less the width of the corresponding fixing groove (20) along the longitudinal direction of the shaft body (10). The bearing structure (1) according to any one of claims 1 to 7.

10. The width of each of the storage grooves (30) along the longitudinal direction of the shaft body (10) is 0.2 times or more and 2 times or less the width of the corresponding fixing groove (20) along the longitudinal direction of the shaft body (10). The bearing structure (1) according to claim 8.

11. Preparation step (S01) involves preparing a shaft body (10), a bearing (100), and an adhesive (50) for fixing the shaft body (10) and the bearing (100). A filling step (S02) is performed in which the adhesive (50) is filled into the shaft body (10) prepared in the preparation step (S01), Following the filling step (S02), a press-fitting step (S03) is performed in which the shaft body (10) is press-fitted into the inner circumference of the bearing (100), Following the press-fitting step (S03), a hardening step (S04) is performed in which the adhesive (50) hardens, and the shaft body (10) and the bearing (100) are fixed and positioned relative to each other. Equipped with, The shaft body (10) prepared in the preparation step (S01) has one or more fixing grooves (20) formed in a direction along the outer circumference of the shaft body (10), and a storage groove (30) corresponding to each of the fixing grooves (20). In the filling step (S02), the adhesive (50) is filled into each of the fixing grooves (20). In the press-fitting step (S03), the shaft body (10) is press-fitted into the bearing (100) until each of the fixing grooves (20) and each of the storage grooves (30) is covered by the bearing (100). In the curing step (S04), once the adhesive (50) has hardened, at least a portion of the space defined by the inner circumferential surface (100a) of the bearing (100) and the storage groove (30) is void. How to install bearing (100).

12. Each of the spaces defined by the fixing groove (20) and the inner circumferential surface (100a) shall be designated as the fixing space (20a), and each of the spaces defined by the storage groove (30) and the inner circumferential surface (100a) shall be designated as the storage space (30a), In the filling step (S02), the volume of the adhesive (50) filled into each of the fixing grooves (20) is equal to or greater than the volume of the corresponding fixing space (20a), When one of the storage grooves (30) and one or more of the fixing grooves (20) that correspond to the one storage groove (30) are considered as a set, In the filling step (S02), the total volume of the adhesive (50) filled into each of the fixing grooves (20) constituting the set is less than the sum of the volumes of the corresponding fixing spaces (20a) and the corresponding storage spaces (30a). A method for mounting a bearing (100) according to claim 11.

13. The shaft body (10) is hollow and made of metal. A method for mounting a bearing (100) according to claim 12.

14. The adhesive (50) is an anaerobic adhesive. A method for mounting a bearing (100) according to claim 13.

15. The depths of each of the aforementioned fixing grooves (20) and each of the aforementioned storage grooves (30) are equal. A method for mounting a bearing (100) according to claim 14.

16. When viewed along the longitudinal axis of the shaft body (10), the entirety of each fixing groove (20) overlaps with the corresponding storage groove (30) in the direction along the outer circumference of the shaft body (10). A method for mounting a bearing (100) according to claim 15.

17. The depth of each of the aforementioned fixing grooves (20) and each of the aforementioned storage grooves (30) is 0.05 mm to 0.4 mm. A method for mounting a bearing (100) according to any one of claims 11 to 16.

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