Centering device and centering method, method and apparatus for manufacturing insert molded products, method for manufacturing rolling bearings, method for manufacturing electrical equipment, and method for manufacturing vehicles

Abstract

A method for manufacturing an insert molded product includes positioning a workpiece (2) with respect to a reference axis (Lc) using a centering device (1), and supplying molding material to the molding space between the mold and the workpiece (2). The centering device (1) comprises a slide member (21), a plurality of centering members (20), and a conversion mechanism (70). The conversion mechanism (70) converts the axial force applied to the slide member (21) into a plurality of radial forces applied to each of the plurality of centering members (20).

Description

[Technical Field]

[0001] This disclosure relates to a centering device and centering method, a method and apparatus for manufacturing insert molded products, a method for manufacturing rolling bearings, a method for manufacturing electrical equipment, and a method for manufacturing vehicles. This application claims priority based on Japanese Patent Application No. 2025-064239, filed on April 9, 2025, and the contents of that application are incorporated herein by reference. [Background technology]

[0002] One type of damage to rolling bearings used in electrical equipment such as electric motors and generators is electrolytic corrosion. Electrolytic corrosion is damage resulting from electrical discharge between the outer ring and the rolling elements, between the inner ring and the rolling elements, or both, causing the discharged area to melt. When electrolytic corrosion occurs, the lifespan of the rolling bearing is significantly reduced.

[0003] For example, International Publication No. 2022 / 202651 discloses a rolling bearing for preventing electrolytic corrosion. The rolling bearing for preventing electrolytic corrosion comprises an outer ring having an outer ring raceway on its inner circumferential surface, an inner ring having an inner ring raceway on its outer circumferential surface, a plurality of rolling elements disposed between the outer ring raceway and the inner ring raceway, and an insulating layer made of synthetic resin that is insert-molded to cover the portion of the surface of at least one of the raceway rings that is outside the raceway. When assembled in a place of use, the rolling bearing for preventing electrolytic corrosion prevents the occurrence of discharge between the outer ring and the rolling elements, and between the inner ring and the rolling elements, by insulating the raceway rings from adjacent members such as the housing and rotating shaft with the insulating layer. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2022 / 202651 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the manufacture of an insulating raceway for a rolling bearing designed to prevent electrolytic corrosion, where an insulating layer is insert-molded onto the surface of the raceway, first, with the raceway set in the fixed mold of the insert molding apparatus, the movable mold is abutted against the fixed mold to perform mold closing (mold clamping), thereby creating a molding space between the fixed mold, the movable mold, and the raceway for insert-molding the insulating layer onto the raceway.

[0006] Next, molten synthetic resin is introduced into the molding space, and the resin is cooled and solidified inside the molding space to insert-molde an insulating layer onto the raceway. In other words, the insulating layer is molded and fixed to the raceway at the same time. After that, the mold is opened by retracting the movable mold relative to the fixed mold, and the raceway with the insulating layer is removed from the insert molding device.

[0007] In the insert-molded raceway with an insulating layer, ensuring that the insulating layer is insert-molded with a uniform thickness around its entire circumference is important for reducing the amount of material removed from the insulating layer in the subsequent finishing process and minimizing the amount of synthetic resin used. In particular, in order to insert-molde the insulating layer with a uniform radial thickness around its entire circumference, it is necessary to precisely align the central axis of the raceway with the central axis of the molding space by precisely centering the raceway.

[0008] This disclosure aims to provide a centering device and a centering method that can center a workpiece with high precision. Furthermore, this disclosure aims to provide a centering device and a centering method, a method and apparatus for manufacturing insert molded products, a method for manufacturing rolling bearings, a method for manufacturing electrical equipment, and a method for manufacturing vehicles that are advantageous for improving quality, high stability, extended lifespan, and / or reducing costs. [Means for solving the problem]

[0009] In one embodiment of the present disclosure, a method for manufacturing an insert molded article includes positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis using a centering device, and supplying a molding material to a molding space between a mold and the workpiece. The centering device comprises a slide member movable along an axial direction parallel to the reference axis, a plurality of centering members spaced apart from each other around the reference axis and each movable along the radial direction, and a conversion mechanism that converts an axial force applied to the slide member into a plurality of radial forces applied to each of the plurality of centering members.

[0010] In another embodiment of the present disclosure, an apparatus for manufacturing an insert molded article comprises a mold, a centering device for positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis, and a supply device for supplying molding material to the molding space between the mold and the workpiece. The centering device comprises a slide member movable along an axial direction parallel to the reference axis, a plurality of centering members spaced apart from each other around the reference axis and each movable along the radial direction, and a conversion mechanism that converts an axial force applied to the slide member into a plurality of radial forces applied to each of the plurality of centering members.

[0011] In another embodiment of the present disclosure, the centering device is configured to position a ring-shaped and / or cylindrical workpiece with respect to a reference axis. The centering device comprises a slide member movable along an axial direction parallel to the reference axis, a plurality of centering members spaced apart from each other around the reference axis and each movable along the radial direction, and a conversion mechanism that converts an axial force applied to the slide member into a plurality of radial forces applied to each of the plurality of centering members.

[0012] In another embodiment of the present disclosure, the centering method involves centering the workpiece using the above-described centering device.

[0013] In another embodiment of the present disclosure, a method for manufacturing an insert molded product comprises a base member and a resin member insert-molded onto the base member, wherein the base member, which will be the workpiece, is centered by the above-described centering method, and the resin member is insert-molded onto the base member.

[0014] For example, in a method for manufacturing insert molded products, the base member can be a raceway ring having a raceway on its inner or outer circumferential surface, which constitutes a rolling bearing, and the resin member can be an insulating layer that covers the portion of the raceway ring's surface that is outside the raceway.

[0015] In another embodiment of the present disclosure, a method for manufacturing a rolling bearing comprises the steps of manufacturing an insert molded product comprising the above-described method for manufacturing an insert molded product, for the purpose of manufacturing a rolling bearing comprising an outer ring having a raceway on its inner circumferential surface, an inner ring having a raceway on its outer circumferential surface, a plurality of rolling elements rotatably disposed between the raceway of the outer ring and the raceway of the inner ring, and an insulating layer covering the portion of the surface of at least one of the raceway rings of the outer ring and the inner ring that is outside the raceway.

[0016] In another embodiment of the present disclosure, a method for manufacturing an electrical device comprises a step of manufacturing a rolling bearing by the above-described method for manufacturing a rolling bearing, in order to manufacture an electrical device equipped with a rolling bearing.

[0017] In another embodiment of the present disclosure, a method for manufacturing a vehicle comprises the step of manufacturing a rolling bearing by the method for manufacturing a rolling bearing described above, in order to manufacture a vehicle equipped with a rolling bearing. [Effects of the Invention]

[0018] According to aspects of the present disclosure, centering of a workpiece can be performed with high accuracy. Further, according to aspects of the present disclosure, there are provided a centering apparatus and a centering method, a method and an apparatus for manufacturing an insert-molded article, a method for manufacturing a rolling bearing, a method for manufacturing an electrical device, and a method for manufacturing a vehicle, which are advantageous for quality improvement, high stability, long service life, and / or cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] [Figure 1] FIG. 1 is a cross-sectional view showing an example of an electrolytic corrosion-resistant rolling bearing provided with a bearing ring. [Figure 2] FIG. 2 is a cross-sectional view showing an example of an electrical device to which an electrolytic corrosion-resistant rolling bearing can be applied. [Figure 3] FIG. 3 is a view of the centering apparatus according to the first embodiment as viewed from the second member side in the axial direction. [Figure 4] FIG. 4 is a cross-sectional view taken along line X-X of FIG. 3, wherein part (A) shows a state before centering of the workpiece, and part (B) shows a state after centering of the workpiece. [Figure 5] FIG. 5 is a cross-sectional view showing an example of the shape of a pressing portion of a centering member. [Figure 6] FIG. 6 is a diagram schematically showing an insert molding apparatus (an apparatus for manufacturing an insert-molded article), and is a cross-sectional view of a centered workpiece and the periphery thereof when insert-molding a resin member onto the workpiece. [Figure 7] FIG. 7 is a diagram showing a centering apparatus according to a second embodiment. [Figure 8] Part (A) of FIG. 8 is a perspective view showing a part of a slide member and a centering member in the centering apparatus of FIG. 7, and part (B) is an exploded perspective view showing a part of the slide member and the centering member. [Figure 9] FIG. 9 is a diagram showing a centering apparatus according to a third embodiment. [Figure 10]Part (A) of Figure 10 is a perspective view showing a part of the first member, a part of the slide member, the centering member, and the radial return spring in the centering device of Figure 9; Part (B) is a cross-sectional view of the part shown in Part (A); and Part (C) is a YY cross-sectional view of Part (B). [Figure 11] Figure 11 shows a centering device according to the fourth embodiment. [Modes for carrying out the invention]

[0020] Embodiments of the present invention will be described with reference to Figures 1 to 11. The reference numerals in parentheses correspond to the reference numerals shown in the description of the embodiments below.

[0021] In one embodiment, a method for manufacturing an insert molded product includes positioning (centering) a workpiece (2, 2A) relative to a reference axis (Lc) using a centering device (1, 1a, 1b, 1A), and supplying molding material to a molding space (53) between a mold (51, 52) and a workpiece (2, 2A). For example, the reference axis (Lc) may include a reference axis (such as a central axis) set on the mold (51, 52), or a reference axis (such as a central axis) set on a predetermined structure on which the mold (51, 52) is set.

[0022] In one example, the workpiece (2, 2A) has a ring shape and / or a cylindrical shape. For example, the workpiece (2, 2A) has at least an inner circumferential surface. In other examples, the workpiece (2, 2A) may have a shape different from the above, such as a disc shape, a cylindrical shape, or a lens shape. For example, the workpiece (2, 2A) has at least one of a raceway surface (raceway), an inner circumferential surface, and an outer circumferential surface that extends in the circumferential direction around a central axis.

[0023] In one embodiment, the insert molded product manufacturing apparatus (80) comprises molds (51, 52), centering devices (1, 1a, 1b, 1A), and a supply device (82). The centering devices (1, 1a, 1b, 1A) are configured to position (center) the workpiece (2, 2A) with respect to a reference axis (Lc). The supply device (82) is configured to supply molding material to the molding space (53) between the molds (51, 52) and the workpiece (2, 2A).

[0024] In one embodiment, the centering device (1, 1a, 1b, 1A) comprises a sliding member (21, 21a, 21b, 21A), a plurality of centering members (20, 20a, 20b, 20A), and a conversion mechanism (70). The sliding member (21, 21a, 21b, 21A) is configured to be movable along an axial direction parallel to a reference axis (Lc). The plurality of centering members (20, 20a, 20b, 20A) are arranged circumferentially spaced apart from each other around the reference axis (Lc) and are configured to be movable along the radial direction. The conversion mechanism (70) is configured to mechanically convert the axial force applied to the sliding member (21, 21a, 21b, 21A) into a plurality of radial forces applied to each of the plurality of centering members (20, 20a, 20b, 20A).

[0025] In one example of the conversion mechanism (70), the axial movement of the slide members (21, 21a, 21b, 21A) is converted into the radial movement of the multiple centering members (20, 20a, 20b, 20A), and consequently, the axial force applied to the slide members (21, 21a, 21b, 21A) is converted into multiple radial forces applied to each of the multiple centering members (20, 20a, 20b, 20A). The radial forces from the multiple centering members (20, 20a, 20b, 20A) act directly or indirectly on the workpiece (2, 2A). For example, the third surface (31, 31a, 31A) of a centering member or the third surface (31, 31a, 31A) of another member connected to a centering member is pressed against the inner or outer circumferential surface of the workpiece (2, 2A). Multiple radial forces applied to the workpiece (2, 2A) can promote the centering of the workpiece (2, 2A) relative to the reference axis (center position). A mechanical centering device (1, 1a, 1b, 1A) utilizing this conversion action is advantageous for compactness and simplification of the mechanism. High-precision centering is advantageous for high-quality insert molding.

[0026] In some embodiments, the centering members (20, 20a, 20b, 20A) are configured to move in a common radially inward or radially outward direction, and the directions of movement of the centering members (20, 20a, 20b, 20A) are multiple radial directions that are different from each other around a central axis. For example, the centering members (20, 20a, 20b, 20A) can be driven in a radial pattern in synchronization with a single axial movement of a sliding member (21, 21a, 21b, 21A). Such mechanisms are advantageous for high synchronization, reduced structural complexity, and miniaturization. In one example, the centering device (1, 1a, 1b, 1A) is preferably applied to both relatively large workpieces (2, 2A) and relatively small workpieces (2, 2A). For example, the centering device (1, 1a, 1b, 1A) is also suitably applied to a technique that centers a workpiece (2, 2A) by applying force to its inner circumferential surface, taking advantage of its space-saving radial design.

[0027] In one example, the conversion mechanism (70) includes one or more first surfaces (32, 32A) provided on the slide members (21, 21a, 21b, 21A) and a plurality of second surfaces (30, 30a, 30A) provided on each of the plurality of centering members (20, 20a, 20b, 20A), wherein the one or more first surfaces (32, 32A) and the plurality of second surfaces (30, 30a, 30A) allow relative sliding and / or relative rolling.

[0028] For example, the conversion mechanism (70) defines a contact area (contact interface) between one or more first surfaces (32, 32A) and multiple second surfaces (30, 30a, 30A), and the contact area allows relative sliding and / or relative rolling (contact rolling). In centering operations, the contact area enables the transmission of force and / or displacement. The relative motion at the contact area prevents mechanical snagging and / or over-restraint, contributing to the smooth operation of the mechanism. In addition, the contact area can absorb at least a portion of tolerances and / or misalignment through relative movement. Furthermore, contact rolling results in relatively less friction and wear at the contact area compared to sliding contact.

[0029] In one example, the conversion mechanism (70) converts the axial force applied to the slide member (21, 21a, 21b, 21A) into multiple radial forces applied to the multiple centering members (20, 20a, 20b, 20A) by cam action and / or wedge action between one or more first surfaces (32, 32A) and multiple second surfaces (30, 30a, 30A).

[0030] In some embodiments, the conversion mechanism (70) can generate a cam action and / or wedge action through the cooperation of the first surfaces (32, 32A) of the slide members (21, 21a, 21b, 21A) and the second surfaces (30, 30a, 30A) of the centering members (20, 20a, 20b, 20A). When an axial force acts on the slide members (21, 21a, 21b, 21A), the first surfaces (32, 32A) generate a radial force component at the contact portion (contact interface), pushing the centering members (20, 20a, 20b, 20A) radially. The axial force acting on the slide members (21, 21a, 21b, 21A) is converted into a radial force acting on the centering members (20, 20a, 20b, 20A). In response to the axial movement of the sliding members (21, 21a, 21b, 21A), the centering members (20, 20a, 20b, 20A) are displaced radially. In the wedge action, the radial force can be amplified according to the axial input, based on the profile (inclined profile) of the first surface (32, 32A) with respect to the reference axis (Lc) and friction conditions.

[0031] In one example, one or more first surfaces (32, 32A) are formed continuously or intermittently on a single slide member (21, 21a, 21b, 21A). For example, the position and profile of one or more first surfaces (32, 32A) can be directly defined with respect to the central axis of the slide member (21, 21a, 21b, 21A). Such a configuration is advantageous for simplifying the structure, improving geometric accuracy, high durability, and high reliability. For example, in the machining of the slide member (21, 21a, 21b, 21A), the entirety of one or more first surfaces (32, 32A) can be formed with high precision with respect to a common machining reference. Furthermore, one or more first surfaces (32, 32A) formed on a single slide member (21, 21a, 21b, 21A) have high geometric accuracy at multiple contact points with multiple centering members (20, 20a, 20b, 20A), which is advantageous for centering accuracy and stability.

[0032] In one example, one or more first surfaces (32, 32A) may include a curved surface formed in the circumferential direction around a central axis, or a tangent plane to the circumference around the central axis. In a centering device, the central axis may coincide with a reference axis (Lc). In machining the slide members (21, 21a, 21b, 21A), the entirety of one or more first surfaces (32, 32A) can be formed with high precision with respect to the central axis, which is a common machining reference. Furthermore, multiple contact points that contact multiple centering members (20, 20a, 20b, 20A) can be formed with high coaxiality on one or more first surfaces (32, 32A). For example, a curved surface as a contact point on a slide member (21, 21a, 21b, 21A) is advantageous not only for suppressing friction and wear with the centering members (20, 20a, 20b, 20A), but also for achieving high centering accuracy. The curved surface extending along the circumference around the central axis can be formed with high roundness and coaxiality by rotational machining such as turning or grinding. Because the surface profile of the first surface (32, 32A) is substantially the same at any position in the circumferential direction, the variation in mechanical action is suppressed to a small extent regardless of the position at which the centering member (20, 20a, 20b, 20A) contacts the first surface (32, 32A). In the centering device (1, 1a, 1b, 1A), the tolerance for centering characteristics and / or conversion characteristics is high, and variations in operating characteristics are suppressed to a small extent.

[0033] In one example, each of the multiple second surfaces (30, 30a, 30A) may include a curved surface around a first axis parallel to the reference axis, a curved surface around a second axis perpendicular to the first axis, and / or a portion of a sphere. This structure reduces the contact pressure between the sliding members (21, 21a, 21b, 21A) and the centering members (20, 20a, 20b, 20A) based on the curvature of the second surfaces (30, 30a, 30A), thereby suppressing friction and wear. Furthermore, since both the first surfaces (32, 32A) of the sliding members (21, 21a, 21b, 21A) and the second surfaces (30, 30a, 30A) of the centering members (20, 20a, 20b, 20A) have curved surfaces, friction and wear at the contact points are further suppressed.

[0034] In one example, the multiple centering members (20, 20a, 20b, 20A) may include three centering members (20, 20a, 20b, 20A) arranged at equal intervals (120° intervals) in the circumferential direction. For example, the three centering members (20, 20a, 20b, 20A) may be in direct or indirect contact with the workpiece (2, 2A). When the workpiece (2, 2A) is radially offset from its center position, the contact loads on the centering members (20, 20a, 20b, 20A) become asymmetric, and the radial components of the reaction forces at the three contact points become unbalanced. This imbalance can generate a restoring force that biases the components toward the center position, thereby providing a self-centering effect. For example, if the workpiece (2, 2A) is displaced off-center, at least one centering member (20, 20a, 20b, 20A) is pressed more firmly against the workpiece (2, 2A), while another centering member (20, 20a, 20b, 20A) is relatively released. The resulting difference in reaction forces generates a radial restoring force that returns the workpiece (2, 2A) towards its centered position. In this way, the three-point contact defines a stable centered position relative to the circumferential surface of the workpiece (2, 2A). In other words, the three centering members (20, 20a, 20b, 20A) can work together to provide a self-centering effect.

[0035] In one example, each of the multiple centering members (20, 20A) may include a spherical body (ball). The spherical body as a centering member (20, 20A) contacts the first surface (32, 32A) of the slide member (21, 21A). When the slide member (21, 21A) is displaced axially, the spherical body is driven radially outward or inward to follow the first surface (32, 32A) of the slide member (21, 21A). The spherical body can rotate during relative motion, thereby reducing friction and wear at the contact surface (contact interface). The contact between the first surface (32, 32A) of the slide member (21, 21A) and the second surface (30, 30A) of the spherical body can be substantially a point contact. Compared to sliding contact between flat surfaces, friction loss and wear are reduced. Multiple spherical bodies, spaced apart in the circumferential direction, distribute the contact load with the sliding members (21, 21A), thereby reducing contact pressure and further suppressing friction and wear. The spherical bodies are also advantageous in reducing friction and wear with other members during radial movement.

[0036] In one example, during the conversion in the conversion mechanism (70), the radial displacement of each of the multiple centering members (20, 20a, 20b, 20A) can be made less than or equal to the axial displacement of the slide member (21, 21a, 21b, 21A). In other examples, displacement ratios other than those described above can be set. For example, the profiles of the first surface (32, 32A) of the slide member (21, 21a, 21b, 21A) and the second surface (30, 30a, 30A) of the centering members (20, 20a, 20b, 20A) are set so that a predetermined displacement ratio (and / or nonlinear displacement characteristic) is applied between the axial movement and the radial movement. In one example where the radial displacement is less than or equal to the axial displacement, the radial displacement / axial displacement ratio can be 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, or less. Additionally and / or alternatively, the inclination angle with respect to the axial direction at the first surface (32, 32A) of the sliding members (21, 21a, 21b, 21A) can be set to 45°, 40°, 35°, 30°, 25°, 20°, 15°, 10°, 5°, or less. The above values ​​are examples and are not limited to those values.

[0037] A mechanism in which the radial movement on the output side is relatively small compared to the axial movement on the input side improves radial positioning accuracy and contributes to improved accuracy and repeatability of position adjustment. Furthermore, such a mechanism suppresses the influence of axial variations and / or errors on the radial side, which is advantageous for improving the positioning accuracy and stability of the centering members (20, 20a, 20b, 20A). In addition, radial displacement is less likely to be excessive, and the change in the contact state with the workpiece (2, 2A) becomes relatively gradual, suppressing operational instability. By maintaining a balance between the actions of the multiple centering members (20, 20a, 20b, 20A), stable centering operation of the workpiece (2, 2A) can be achieved.

[0038] In one example, the centering device (1, 1a, 1b, 1A) may additionally include a first biasing means (first biasing body, first biasing mechanism) (22, 22A) for applying an axial biasing force to the slide members (21, 21a, 21b, 21A), and / or a second biasing means (second biasing body, second biasing mechanism) (43) for applying a radial biasing force to a plurality of centering members (20, 20a, 20b, 20A). In another example, the centering device may be configured without the first biasing means (22, 22A) and / or the second biasing means (43). The first biasing means (22, 22A) and the second biasing means (43) may contribute to the application of preload, stabilization of centering, and return operation.

[0039] For example, the biasing means (22, 22A, 43) can be implemented using various springs such as compression coil springs, tension coil springs, leaf springs, and disc springs. Other examples of biasing means include elastic members, gas springs (gas cylinders), hydraulic cylinders, and mechanisms utilizing magnetic force such as permanent magnets or electromagnets. One or more of these means can be used in combination.

[0040] In one example, a first biasing means (22, 22A) acts on the slide members (21, 21a, 21b, 21A) to apply an axial preload to them. The axial preload is transmitted through the contact portion and converted into a radial force acting on the multiple centering members (20, 20a, 20b, 20A). This biases the multiple centering members (20, 20a, 20b, 20A) radially outward or radially inward. In another example, the slide members (21, 21a, 21b, 21A) are axially biased by the first biasing means (22, 22A), and the multiple centering members (20, 20a, 20b, 20A) are radially biased by the second biasing means (43). For example, the second biasing means (43) may be used to adjust, distribute, or supplement radial forces. Placing at least a portion of the biasing means on the axial side of the mechanism may contribute to reducing the overall size of the mechanism in the radial direction. This is advantageous for making the overall structure more compact while maintaining a stable radial load for centering.

[0041] In one example, the centering device (1, 1a, 1b, 1A) can be configured to perform a centering operation in conjunction with the movement of the molding dies (51, 52). For example, the movable die (52) moves axially along the reference axis relative to the fixed die (51). As the movable die (52) approaches the fixed die (51), the sliding members (21, 21a, 21b, 21A) move axially relative to the centering members (20, 20a, 20b, 20A). In one example, the centering members (20, 20a, 20b, 20A) are supported by the fixed die (51) so that they can move radially. The movable die (52) is operatively connected to the sliding members (21, 21a, 21b, 21A) so that the movement of the movable die (52) is transmitted to the sliding members (21, 21a, 21b, 21A). In other examples, the relationship between the centering device (1, 1a, 1b, 1A) and the mold (51, 52) can be different from that described above. If necessary, support members can be provided to temporarily support the workpiece (2, 2A). The interlocking structure of the mold (51, 52) and the centering device (1, 1a, 1b, 1A) is advantageous for simplifying the work process and improving accuracy. In other examples, the mold (51, 52) and the centering device (1, 1a, 1b, 1A) can be configured not to be interlocked. In one example, a molding space (53) is formed between the workpiece (2, 2A) centered by the centering device (1, 1a, 1b, 1A) and the mold (51, 52), and the supply device (82) of the insert molding device (insert molded product manufacturing device) (80) supplies molding material to the molding space (53). In other examples, the centering devices (1, 1a, 1b, 1A) can be applied to uses other than molding.

[0042] In one embodiment, the centering device (1, 1a, 1b, 1A) comprises a first member (18, 18a, 18b, 18A) having a central axis (Lc), a second member (19, 19a, 19A) positioned to move axially relative to the first member in the direction of the central axis, a plurality of centering members (20, 20a, 20b, 20A), and a sliding member (21, 21a, 21b, 21A). The plurality of centering members are positioned at multiple locations in the circumferential direction of the first member with respect to the central axis, and are positioned to move radially relative to the first member with respect to the central axis. Each of the plurality of centering members has a guided portion (30, 30a, 30A) and a pressing portion (31, 31a, 31A) located on one side of the radial direction from the guided portion, for pressing against the other radial side surface of the workpiece. The slide member is positioned to be movable in the axial direction relative to each of the first and second members, and has a guide portion that can engage with the guided portion of each of the centering members, and converts the force applied from itself to each of the centering members in one axial direction into a force applied to one of the radial directions based on the engagement between the guided portion of each of the centering members and the guide portion, and has a centering function that centers the workpiece by pressing the pressing portion of each of the centering members against the other radial circumferential surface of the workpiece with this force.

[0043] In one example, the centering device may include a biasing spring (22, 22A) positioned between the second member and the slide member, which elastically biases the slide member toward one side in the axial direction relative to the second member.

[0044] In one example, the centering device may include a stopper mechanism (34, 34A) that restricts the amount of movement of the slide member to one side in the axial direction relative to the second member.

[0045] In one example, the centering device may include an axial return spring (39) positioned between the first member and the slide member, which elastically biases the slide member toward the other side in the axial direction relative to the first member.

[0046] In one example, the guide portion (32, 32A) can be made up of guide inclined surfaces that are inclined in a direction toward the other radial side as they move toward one side in the axial direction.

[0047] In one example, each of the multiple centering members (20, 20A) can be made up of a ball.

[0048] In one example, the guided portion (30a) can be composed of a guided inclined surface that is in surface contact with the guide inclined surface.

[0049] In one example, one of the centering member and the sliding member may have a guide groove (41) that extends in a direction toward the other radial side as it moves toward one axial side, and whose circumferential width dimension is wider at the bottom side in the depth direction than at the opening side, and the other of the centering member and the sliding member may have a guide projection (42) that engages with the guide groove in a manner that allows movement in the extension direction of the guide groove, but prevents it from coming out through the opening in the depth direction of the guide groove.

[0050] In one example, the centering device may include a radial return spring (43) positioned between the first member and each of the plurality of centering members, which elastically biases the centering member toward the other radial direction relative to the first member.

[0051] [First Embodiment] A first embodiment of this disclosure will be described with reference to Figures 1 to 6.

[0052] In this example, the centering device 1 centers the workpiece 2, that is, the central axis (reference axis, central axis) L of the first member 18 that constitutes the centering device 1. C It is used to align the central axis (central axis) of workpiece 2 with the other element.

[0053] The centering device 1 can be used for various purposes, such as inspecting the shape and dimensions of a centered workpiece 2, performing processing such as cutting and grinding, and assembling other components.

[0054] The constituent materials of the workpiece 2 are not particularly limited. For example, the workpiece 2 can be made of any material, such as a metallic material like a hard metal or a resin material.

[0055] The shape of the target workpiece 2 is not particularly limited, as long as it has a circumferential surface that is pressed by the pressing portion (third surface, third contact surface, pressing surface) 31 of each centering member 20 constituting the centering device 1. For example, the workpiece 2 can be made of a hollow member such as a ring-shaped member or a cylindrical member, or a solid member such as a columnar member, which has a circumferential surface having any cross-sectional shape such as a circle or polygon. The centering device 1 in this example is suitably applied to centering a cylindrical member which has a circumferential surface having a circular cross-sectional shape.

[0056] The centering device 1 in this example can be suitably used in the manufacturing process of an insert molded product comprising a base member that forms a ring-shaped workpiece 2 and a resin member that is insert-molded onto the base member, in order to ensure coaxiality between the mold (molding die) and the base member when insert-molding the resin member onto the outer or inner circumferential surface of the base member and the end faces on both sides in the axial direction.

[0057] The insert molded products that can be used include various types of gears with teeth on a resin component, various types of pulleys with belt-passing sections on a resin component, various types of rollers with rolling contact sections on a resin component, and insulating layered components that form an insulating layer using a resin component, insulating the base component from adjacent components.

[0058] In this example, the target insert molded product is an insulating layered raceway ring, which is a type of insulating layered member that constitutes a rolling bearing for preventing electrolytic corrosion.

[0059] <Rolling bearings for preventing electrolytic corrosion> An example of the structure of a rolling bearing for preventing electrolytic corrosion will be explained with reference to Figures 1(A) to 1(D). The rolling bearings 3a to 3d for preventing electrolytic corrosion include outer rings 4a to 4d having raceways (outer ring raceways) 5a and 5b on their inner circumferential surfaces, inner rings 6a to 6d having raceways (inner ring raceways) 7a and 7b on their outer circumferential surfaces, a plurality of rolling elements 8a and 8b arranged to roll freely between the raceways 5a and 5b of the outer rings 4a to 4d and the raceways 7a and 7b of the inner rings 6a to 6d, and insulating layers 9a and 9b that cover at least a portion of the surface of at least one of the raceway rings (outer rings 4a to 4d and inner rings 6a to 6d) that is outside the raceway.

[0060] Each of the raceways 5a, 5b, 7a, and 7b has a generatrix shape corresponding to the shape of the multiple rolling elements 8a, 8b. When the multiple rolling elements 8a, 8b are composed of balls or spherical rollers, each of the raceways 5a, 5b, 7a, and 7b has an arc-shaped generatrix. When the multiple rolling elements 8a, 8b are composed of cylindrical rollers (including needles), each of the raceways 5a, 5b, 7a, and 7b has a linear generatrix parallel to the central axis of the raceway. When the multiple rolling elements 8a, 8b are composed of conical rollers, each of the raceways 5a, 5b, 7a, and 7b has a linear generatrix inclined with respect to the central axis of the raceway.

[0061] In the rolling bearings 3a and 3b shown in Figures 1(A) and 1(B), since the multiple rolling elements 8a are composed of balls, the respective raceways 5a and 7a have an arc-shaped generatrix. In the rolling bearings 3c and 3d shown in Figures 1(C) and 1(D), since the multiple rolling elements 8b are composed of cylindrical rollers, the respective raceways 5b and 7b have a linear generatrix shape parallel to the central axis of the raceways 5b and 7b. In each of the rolling bearings 3a to 3d, the multiple rolling elements 8a and 8b can be held to roll freely by a cage (not shown).

[0062] In the rolling bearing 3c shown in Figure 1(C), the outer ring 4c has flanges 10 that project radially inward to the portions adjacent to the axial sides of the raceway 5b. In the rolling bearing 3d shown in Figure 1(D), the inner ring 6d has flanges 11 that project radially outward to the portions adjacent to the axial sides of the raceway 7b. Each flange 10 and 11 has the function of restricting the axial position of the multiple rolling elements 8b.

[0063] The rolling bearings 3a and 3c shown in Figures 1(A) and 1(C) are provided with only an insulating layer 9a that covers at least a portion of the surface of the outer rings 4a and 4c that is not adjacent to the raceways 5a and 5b. In the raceway rings 50A and 50C with insulating layers, which consist of the outer rings 4a and 4c and the insulating layer 9a, the insulating layer 9a can be formed to cover the portion of the surface of the outer rings 4a and 4b that is not adjacent to the raceways 5a and 5b and includes a portion where contact with adjacent members should be avoided. In the illustrated example, the insulating layer 9a covers the outer circumferential surface and the axial sides of the outer rings 4a and 4b.

[0064] The rolling bearings 3b and 3d shown in Figures 1(B) and 1(D) are provided with only an insulating layer 9b that covers at least a portion of the surface of the inner rings 6b and 6d that is not adjacent to the raceways 7a and 7b. In the raceway rings 50B and 50D with insulating layers, which consist of the inner rings 6b and 6d and the insulating layer 9b, the insulating layer 9b can be formed to cover the portion of the surface of the inner rings 6b and 6d that is not adjacent to the raceways 7a and 7b and includes a portion where contact with an adjacent member should be avoided. In the illustrated example, the insulating layer 9b covers the inner circumferential surface and the axial sides of the inner rings 6b and 6d.

[0065] In this example, we will describe an instance in which the centering device 1 is used to center the workpiece 2 in order to ensure coaxiality between the workpiece 2 and the mold (molding die) when insert molding an insulating layer 9a onto the outer circumferential surface and both axial sides of the workpiece 2, which is the outer ring 4a of a rolling bearing 3a using balls as rolling elements 8a.

[0066] <Devices to which rolling bearings can be applied for preventing electrolytic corrosion> Rolling bearings designed to prevent electrolytic corrosion can be applied to various devices such as electric motors, generators, other electrical equipment, machinery, and vehicles.

[0067] Figure 2 shows an example of an electrical device to which rolling bearings for preventing electrolytic corrosion can be applied. The electrical device 12 shown in Figure 2 is an electric motor and comprises a rotating shaft 13, a housing 14, a rotor 15, a stator 16, and two rolling bearings 17.

[0068] The housing 14 is configured in a cylindrical shape with openings on both axial sides closed. The housing 14 is constructed by combining multiple parts, and in the process of combining these multiple parts, the stator 16 and rotor 15 can be housed inside the housing 14, and the rotating shaft 13 can be assembled to be rotatably supported by two rolling bearings 17 relative to the housing 14.

[0069] The rotating shaft 13 is rotatably supported by two rolling bearings 17 located axially spaced apart inside the housing 14. In this configuration, one axial end of the rotating shaft 13 protrudes outside the housing 14.

[0070] The rotor 15 is externally fitted and fixed to the portion of the rotating shaft 13 located between the two rolling bearings 17 in the axial direction, so as to rotate integrally with the rotating shaft 13.

[0071] The stator 16 is positioned around the rotor 15 so as to be coaxial with and rotatable relative to the rotor 15, and is fitted and fixed to the inner circumferential surface of the housing 14.

[0072] Various anti-corrosion rolling bearings, including the anti-corrosion rolling bearings 3a to 3d shown in Figures 1(A) to 1(D), can be used as at least one of the two rolling bearings 17.

[0073] <Structure of the centering device> The centering device 1 comprises a first member 18, a second member 19, a plurality of centering members 20, a sliding member 21, and a biasing spring 22.

[0074] In the following description of the centering device 1, unless otherwise specified, the axial direction, radial direction, and circumferential direction refer to the axial direction (center axis L) of the first member 18. C (direction), radial direction (center axis L) C (radial direction centered on the central axis L) and circumferential direction (central axis L) C This refers to the circumferential direction centered on the first member 18. The axial, radial, and circumferential directions of the first member 18 coincide with the axial, radial, and circumferential directions of the second member 19, and also coincide with the axial, radial, and circumferential directions of the workpiece 2. One axial side refers to the lower side in Figures 4(A) and 4(B), and the other axial side refers to the upper side in Figures 4(A) and 4(B). One radial side refers to the side on which the multiple centering members 20 move radially when centering the workpiece 2, and in this example, it refers to the radially outer side.

[0075] The first member 18 has a central axis L C It holds.

[0076] The first member 18 is positioned to allow relative axial movement with respect to the second member 19. Specifically, the first member 18 can be positioned to be immobile or immobile in the axial direction. In this example, the first member 18 is positioned to be immobile in the axial direction. Also, the central axis L C It can be positioned in any direction, such as vertically or horizontally. In this example, the central axis L C They are arranged vertically.

[0077] The first member 18 can be constructed as a single unit, that is, as a single part, or by combining multiple parts. In this example, detailed illustrations are omitted, but the first member 18 is constructed by combining multiple parts.

[0078] In this example, the first member 18 is located along the central axis L C It has a disc-shaped or hollow circular plate-shaped substrate portion 23 centered on the base portion 23, and a cylindrical portion 24 extending from one radial end of the substrate portion 23 toward the other axial end.

[0079] In this example, the cylindrical portion 24 has guide holes 25 that penetrate radially at multiple locations in the circumferential direction. The guide holes 25 are elements that guide the radial movement of the centering member 20 when the centering member 20 is placed inside them. The number of guide holes 25 is determined according to the number of centering members 20. In this example, there are 3 centering members 20. Therefore, the number of guide holes 25 is 3, matching the number of centering members 20. The 3 guide holes 25 are arranged at equal intervals in the circumferential direction.

[0080] The guide hole 25 has an inner peripheral surface shape that conforms to the shape of the centering member 20, specifically, an inner peripheral surface shape capable of guiding the centering member 20 along the radial direction without rattling. In the present example, the centering member 20 is formed of a ball. Therefore, the guide hole 25 has a substantially cylindrical inner peripheral surface shape. Specifically, in the present example, the inner peripheral surface of the guide hole 25 is formed of a cylindrical surface slightly larger in diameter than the centering member 20, except for an end portion on one side in the radial direction. Of the inner peripheral surface of the guide hole 25, the end portion on one side in the radial direction is formed of a concave curved surface portion 26 inclined in a direction where the inner diameter decreases toward the one side in the radial direction. The radius of curvature of the concave curved surface portion 26 is substantially equal to the radius of curvature of the surface of the centering member 20. The inner diameter of the end portion on one side in the radial direction of the concave curved surface portion 26, that is, the inner diameter of the end portion on one side in the radial direction of the guide hole 25, is set smaller than the diameter of the centering member 20, thereby preventing the centering member 20 from falling off from the inside of the guide hole 25 to the one side in the radial direction.

[0081] The base plate portion 23 has, in a portion on the other side in the radial direction, a convex portion 27 protruding toward the other side in the axial direction. The convex portion 27 blocks further movement of the centering member 20 toward the other side in the radial direction by causing the centering member 20, which has moved to the other side in the radial direction inside the guide hole 25, to abut against the end portion on the one side in the radial direction of the convex portion 27. This prevents the centering member 20 from falling off from the inside of the guide hole 25 to the other side in the radial direction.

[0082] It should be noted that, in the present example, the first member 18 has an insertion passage (not shown) for inserting the centering member 20 into the inside of the guide hole 25. After the centering member 20 is inserted into the inside of the guide hole 25, the insertion passage is closed by a sealing member (not shown).

[0083] The second member 19 is arranged to allow relative axial movement with respect to the first member 18. Specifically, the second member 19 can be arranged such that movement in the axial direction is disabled or enabled. In the present example, the second member 19 is arranged relative to the first member 18 along the central axis L C so as to allow movement in the axial direction, which is the direction of

[0084] Specifically, the second member 19 is positioned on the other axial side of the first member 18 and is capable of axial movement by an electric or hydraulic actuator (not shown).

[0085] The second member 19 can be constructed as a single unit or by combining multiple parts. In this example, detailed illustrations are omitted, but the second member 19 is constructed by combining multiple parts.

[0086] In this example, the second member 19 is located along the central axis L. C It has a disc-shaped or hollow circular plate-shaped substrate portion 28 centered on the base portion 28, and a cylindrical portion 29 extending from one radial end of the substrate portion 28 toward one axial direction.

[0087] Multiple centering members 20 are located along the central axis L of the first member 18. C Multiple locations in the circumferential direction centered on the first member 18, along the central axis L C Each is positioned to allow radial movement around the center, and each has a guided portion 30 and a pressing portion 31 located radially to one side of the guided portion 30, for pressing against the other radial side surface of the workpiece 2.

[0088] The number of centering members 20 is three or more, but is not limited to this number; for example, it can be between three and nine. In this example, the number of centering members 20 is three. The three centering members 20 are arranged at equal intervals in the circumferential direction.

[0089] The guided portion 30 is an element that converts a force applied from the slide member 21 to the centering member 20 in one axial direction into a force applied in one radial direction, based on its engagement with the guide portion 32 of the slide member 21. The guided portion 30 is also the part of the slide member 21 that is guided by the guide portion 32. In other words, as the first member 18 and the second member 19 move closer to each other in the axial direction, the centering member 20 moves in one radial direction, based on the fact that the guided portion 30 is guided by the guide portion 32 of the slide member 21.

[0090] The pressing portion 31 is pressed against the circumferential surface of the workpiece 2 on the other radial side as the centering member 20 moves to one radial side. The centering device 1 centers the workpiece 2 by pressing each of the pressing portions 31 of the multiple centering members 20 against the circumferential surface of the workpiece 2 on the other radial side.

[0091] The pressing portion 31 can have any shape as long as it can be stably pressed against the circumferential surface on the other radial side of the workpiece 2.

[0092] For example, if the workpiece 2 is the outer ring 4a shown in Figure 1(A) (or the inner ring 6b shown in Figure 1(B)), the pressing portion 31 can be configured with a surface having an arc-shaped cross-section with a radius of curvature smaller than the radius of curvature of the raceway 5a (or 7a), as shown in Figure 5(A), and this surface can be pressed against the bottom of the groove of the raceway 5a (or 7a).

[0093] Alternatively, as shown in Figure 5(B), the pressing portion 31 can be configured with a surface having an arc-shaped cross-section with a radius of curvature larger than that of the track 5a (or 7a), and this surface can be pressed against the axial edges on both sides of the track 5a (or 7a).

[0094] Alternatively, as shown in Figure 5(C), the pressing portion 31 can be constructed as a composite surface comprising a portion p1 in the axial middle having an arc-shaped cross-section with a radius of curvature larger than that of the raceway 5a (or 7a), and portions p2 on both axial sides adjacent to portion p1 having a linear cross-section that extends in the axial direction. In this case, portion p1 can be pressed against the axial edges on both sides of the raceway 5a (or 7a), and each portion p2 can be pressed against the cylindrical shoulder portion of the inner circumferential surface of the outer ring 4a (or the outer circumferential surface of the inner ring 6b) that is adjacent to both sides of the axial direction of the raceway 5a (or 7a).

[0095] Alternatively, as shown in Figure 5(D), the pressing portion 31 can be configured with a surface having a linear cross-sectional shape extending in the axial direction, and this surface can be pressed against the cylindrical shoulder portion adjacent to both sides in the axial direction of the raceway 5a (or 7a) on the inner circumferential surface of the outer ring 4a (or the outer circumferential surface of the inner ring 6b).

[0096] Furthermore, if the workpiece 2 is the outer ring 4c shown in Figure 1(C) (or the inner ring 6d shown in Figure 1(D)), the pressing portion 31 can be configured with a surface having a linear cross-sectional shape extending in the axial direction, as shown in Figure 5(E), and this surface can be pressed against the raceway 5b (or 7b).

[0097] Furthermore, as shown in Figure 5(F), if the circumferential surface on the other radial side of the workpiece 2 (the left circumferential surface in Figure 5(F)) is composed of a cylindrical surface whose diameter does not change with respect to the axial direction, the pressing portion 31 can be composed of a surface having a linear cross-sectional shape that extends in the axial direction, and this surface can be pressed against the circumferential surface on the other radial side of the workpiece 2.

[0098] In this example, each centering member 20 is composed of a ball (spherical body).

[0099] In other words, in this example, the target insert molded product is an insulating raceway ring 50A having an outer ring 4a and an insulating layer 9a, as shown in Figure 1(A), and the workpiece 2 is the outer ring 4a. In this example, the radius of the balls constituting each centering member 20, that is, the radius of curvature of the cross-sectional shape of the surface of the balls, is made smaller than the radius of curvature of the cross-sectional shape of the raceway 5a of the outer ring 4a. As a result, similar to the example shown in Figure 5(A), the pressing portion 31, which is a part of the surface of the balls, is pressed against the bottom of the groove of the raceway 5a.

[0100] Each centering member 20 is positioned inside the guide hole 25 of the first member 18 so as to be movable in the radial direction. In this example, of the surface of each centering member 20, the end on the other radial side becomes the guided portion 30, and the end on the one radial side becomes the pressing portion 31. In this example, as shown in Figure 4(B), when each centering member 20 is moved to one radial side, the pressing portion 31 of each centering member 20 protrudes from the guide hole 25 to one radial side. In contrast, as shown in Figure 4(A), when each centering member 20 is moved to the other radial side, the pressing portion 31 of each centering member 20 retracts inside the guide hole 25.

[0101] The slide member 21 is positioned to be movable in the axial direction relative to the first member 18 and the second member 19, and has a guide portion 32 that can engage with the guided portion 30 of each centering member 20. Based on the engagement between the guided portion 30 of each centering member 20 and the guide portion 32, it converts the force applied from itself (the slide member 21) to each centering member 20 in one axial direction into a force directed in one radial direction.

[0102] The guide portion 32 is the part that guides the guided portion 30 of each centering member 20. That is, as the slide member 21 moves relative to the centering member 20 in one axial direction, the guide portion 32 guides the guided portion 30 of each centering member 20, causing the multiple centering members 20 to move radially in one direction.

[0103] As long as the slide member 21 has the above configuration, it can be composed of a single slide member 21, or it can be composed of multiple slide members 21, one for each centering member 20. When the slide member 21 is composed of multiple slide members 21, one guide portion 32 is provided for each slide member 21.

[0104] In this example, the slide member 21 is composed of one slide member 21. In this example, the slide member 21 is located along the central axis L C It has a roughly cylindrical shape centered on [a specific point]. Furthermore, the guide portion 32 is provided on the outer circumferential surface of one half of the slide member 21 on the axial side, at the same circumferential position as each centering member 20. However, the guide portion 32 can also be provided around the entire circumference of the outer circumferential surface of one half of the slide member 21 on the axial side.

[0105] The guide portion 32 can have any shape as long as it can perform the functions described above. In this example, the guide portion 32 is composed of guide inclined surfaces that are inclined in a direction toward the other radial direction as it moves toward one axial direction.

[0106] The guide inclined surface constituting the guide portion 32 can be made of a plane that is inclined in a direction that is inclined radially toward the other side as it is directed toward one side in the axial direction, a conical surface that is inclined radially toward the other side as it is directed toward one side in the axial direction, or a convex curved surface having a curved generatrix shape that is inclined radially toward the other side as it is directed toward one side in the axial direction. In this example, the guide inclined surface constituting the guide portion 32 is made of a plane that is inclined radially toward the other side as it is directed toward one side in the axial direction.

[0107] The sliding member 21 can be supported by the first member 18, the second member 19, or a separately provided guide member, allowing it to move in the axial direction.

[0108] In this example, the slide member 21 is supported to allow axial movement relative to the second member 19. Specifically, the slide member 21 is supported to allow axial movement relative to the second member 19 by fitting its other axial end into the cylindrical portion 29 of the second member 19 without radial play and allowing axial movement.

[0109] In this example, the sliding member 21 is prevented from rotating relative to the second member 19 by an anti-rotation mechanism (not shown). The anti-rotation mechanism can have any configuration, and can be configured, for example, by spline engagement, engagement between an axial guide groove and a guide projection, or engagement between an axial guide pin and a guide hole.

[0110] The biasing spring 22 is positioned between the second member 19 and the slide member 21, and elastically biases the slide member 21 axially toward one side relative to the second member 19.

[0111] The biasing spring 22 can be of any type, shape, and installation location as long as it can elastically bias the slide member 21 toward one axial direction relative to the second member 19, and can be composed of one biasing spring 22 or multiple biasing springs 22.

[0112] In this example, the biasing spring 22 is composed of multiple biasing springs 22 (three in this example), each of which is a coil spring. Each biasing spring 22 is positioned at the same circumferential position as the centering member 20. In this example, the slide member 21 has multiple holding holes 33, each positioned at the same circumferential position as the centering member 20 and opening only on the other axial side. Each biasing spring 22, while positioned inside the holding hole 33, is elastically compressed between the bottom surface of the holding hole 33 and the axial side surface of the base portion 28 of the second member 19, thereby elastically biasing the slide member 21 toward the axial side relative to the second member 19.

[0113] The centering device 1 has a centering function that, as the first member 18 and the second member 19 move closer to each other in the axial direction, converts the force applied from the slide member 21 to each centering member 20 by the biasing force of the biasing spring 22, based on the engagement between the guide portion 32 of the slide member 21 and the guided portion 30 of each centering member 20, into a force directed radially to the other side, and uses this force to press the pressing portion 31 of each centering member 20 against the circumferential surface on the other radial side of the workpiece 2, thereby centering the workpiece 2.

[0114] The centering device 1 in this example includes, as an optional component, a stopper mechanism 34 that restricts the amount of axial movement of the slide member 21 relative to the second member 19 to one side. Therefore, in this example, as the second member 19 is moved to the other side in the axial direction, the stopper mechanism 34 makes it possible to move the slide member 21 to the other side in the axial direction relative to each centering member 20.

[0115] The stopper mechanism 34 can be configured by a mechanism that restricts the amount of axial movement of the slide member 21 relative to the second member 19 in one direction by bringing a part of the second member 19 and a part of the slide member 21 into axial contact in the axial direction, or by a mechanism that restricts the amount of axial movement of the slide member 21 relative to the second member 19 in one direction by bringing a stopper member fixed to one of the second member 19 and the slide member 21 into axial contact with a part of the other of the second member 19 and the slide member 21.

[0116] In this example, the stopper mechanism 34 is configured to restrict the amount of axial movement of the slide member 21 relative to the second member 19 by bringing into contact the side surface on the other axial side of the second member side flange 35, which protrudes radially from one axial end of the cylindrical portion 29 of the second member 19, and the side surface on the one axial side of the slide member side flange 36, which protrudes radially from the other axial end of the slide member 21.

[0117] With one axial side of the slide member side flange 36 in contact with the other axial side of the second member side flange 35, an axial gap is created between the other axial side of the slide member 21 and one axial side of the base portion 28 of the second member 19. That is, the axial width of the slide member side flange 36 is smaller than the axial distance between one axial side of the base portion 28 of the second member 19 and the other axial side of the slide member side flange 35. The slide member 21 can move axially relative to the second member 19 between an axial position where one axial side of the slide member side flange 36 in contact with the other axial side of the second member side flange 35 and an axial position where the other axial side of the slide member 21 in contact with one axial side of the base portion 28 of the second member 19.

[0118] With the axial side surface of the slide member side flange 36 in contact with the axial side surface of the second member side flange 35, the biasing spring 22 is elastically compressed between the bottom surface of the holding hole 33 and the axial side surface of the base portion 28 of the second member 19. As shown in Figure 4(A), when the second member 19 is retracted to the axial side relative to the first member 18, the slide member 21 is elastically biased toward one axial side by the biasing spring 22, so that the axial side surface of the slide member side flange 36 is pressed against the axial side surface of the second member side flange 35.

[0119] When centering the workpiece 2, as shown in Figures 4(A) to 4(B), the axial distance between the bottom surface of the holding hole 33 and the axial side surface of the base portion 28 of the second member 19 decreases, thereby increasing the elastic compression amount of the biasing spring 22. In this example, as shown in Figure 4(B), even when the centering of the workpiece 2 is completed by pressing the pressing portion 31 of the centering member 20 against the track 5a of the workpiece 2, the axial distance between the axial side surface of the slide member 21 and the axial side surface of the base portion 28 of the second member 19 is adjusted so that the axial side surface of the slide member 21 on the other axial side does not come into contact with the axial side surface of the base portion 28 of the second member 19.

[0120] In this example, the slide member 21 is assembled to the radially inner side of the cylindrical portion 29 of the second member 19 as the second member 19 is assembled from multiple parts.

[0121] <Explanation of the operation of the centering device> The operation of the centering device 1 in this example will be explained below using Figures 4(A) and 4(B).

[0122] When centering the workpiece 2 using the centering device 1 in this example, first, as shown in Figure 4(A), the second member 19 and the slide member 21 are moved to the other axial side relative to the first member 18.

[0123] In this state, the workpiece 2 (outer ring 4a) is placed radially outward from the cylindrical portion 24 of the first member 18. Specifically, in this example, the workpiece 2 is placed on a support member (not shown) and then positioned radially on the other side of the cylindrical portion 24 of the first member 18.

[0124] Next, the first member 18, the second member 19, and the slide member 21 are moved relative to each other in the axial direction. In this example, the second member 19 and the slide member 21 are moved to one side in the axial direction. This causes the guide portion 32 of the slide member 21 to come into contact with the guided portions 30 of the multiple centering members 20.

[0125] From this state, as the second member 19 and the slide member 21 are moved further to one side in the axial direction, the guide portions 32 of the slide member 21 guide the guided portions 30 of the multiple centering members 20, causing the multiple centering members 20 to move radially to one side in synchronous motion. This causes the pressing portions 31 of the multiple centering members 20 to lightly contact the circumferential surface on the other radial side of the workpiece 2, specifically the bottom of the groove of the track 5a.

[0126] From this state, the second member 19 is moved further to one side in the axial direction, specifically, to a predetermined position in the axial direction, thereby further elastically compressing the biasing spring 22 between the second member 19 and the slide member 21, as shown in Figure 4(B). Then, based on the engagement between each guide portion 32 of the slide member 21 and the guided portion 30 of each centering member 20, the force applied from the slide member 21 to each centering member 20 by the biasing force of the biasing spring 22, which is directed in one side in the axial direction, is converted into a force directed in one side in the radial direction. Then, this force directed in one side in the radial direction presses the pressing portion 31 of each centering member 20 against the circumferential surface on the other side in the radial direction of the workpiece 2, specifically against the bottom of the groove of the track 5a, thereby centering the workpiece 2.

[0127] Furthermore, the movement of the second member 19 in one axial direction from the state shown in Figure 4(A) to the state shown in Figure 4(B) can be performed continuously.

[0128] After the predetermined processing of the centered workpiece 2 (in this example, insert molding of the insulating layer 9a) is completed, when removing the workpiece 2 from the centering device 1, the second member 19 and the slide member 21 are retracted to the other axial side relative to the first member 18, as shown from Figure 4(B) to Figure 4(A). Then, in this state, the workpiece 2 is pulled out axially from the radially outer side of the cylindrical portion 24 of the first member 18.

[0129] In other words, in this example, as shown in Figures 4(B) to 4(A), with the second member 19 and the slide member 21 retracted to the other axial side relative to the first member 18, the balls constituting each centering member 20 can be retracted inside the guide hole 25. Therefore, when the workpiece 2 is pulled out axially from the radially outer side of the cylindrical portion 24 of the first member 18, even if the radially outer end of the ball constituting the centering member 20 enters the track 5a of the workpiece 2, the ball is pushed by the track 5a and retracts inside the guide hole 25 as the workpiece 2 is pulled out axially, thus enabling the pulling operation to proceed smoothly.

[0130] Furthermore, when implementing a centering device according to one embodiment of this disclosure, with the second member 19 and the slide member 21 retracted to the other axial side relative to the first member 18, an inclined surface can be provided at one axial end (lower end) of the inner circumferential surface of the guide hole 25 to move the ball constituting the centering member 20 into the inside of the guide hole 25 by the action of gravity. Alternatively, such an inclined surface can be formed from a part of the concave curved surface portion 26.

[0131] According to the centering device 1 of this example, as the first member 18 and the second member 19 are brought closer to each other in the axial direction, the pressing portions 31 of the multiple centering members 20, which move synchronously to one side in the radial direction, are pressed against the circumferential surface of the workpiece 2 on the other side in the radial direction, thereby enabling high-precision centering of the workpiece 2.

[0132] In particular, in the centering device 1 of this example, the slide member 21 is composed of a single slide member 21. Therefore, even if there is variation in the elastic biasing force of each biasing spring 22, the axial movement of the slide member 21 at the circumferential position where each biasing spring 22 is located can be made equal to each other. Consequently, when centering the workpiece 2, it becomes easy to make the amount of radial movement of each centering member 20 equal to one side with high precision, and thus it becomes easy to center the workpiece 2 with high precision.

[0133] In the centering device 1 of this example, the workpiece 2 is centered by pressing the pressing portions 31 of multiple centering members 20 against the circumferential surface on the other radial side of the workpiece 2 based on the elastic biasing force of a biasing spring 22. Therefore, it is possible to effectively prevent indentations from the pressing portions 31 of the multiple centering members 20 from being left on the circumferential surface on the other radial side of the workpiece 2. Furthermore, even if the diameter of the circumferential surface on the other radial side of the target workpiece 2 is different, it is possible to press the pressing portions 31 of the multiple centering members 20 against the circumferential surface on the other radial side of the workpiece 2 based on the elastic biasing force of the biasing spring 22. Therefore, the centering device 1 of this example makes it possible to center multiple types of workpieces 2 with different diameters of the circumferential surface on the other radial side.

[0134] <Method for manufacturing insert molded products> The method for manufacturing an insert molded product involves centering the workpiece 2 using a centering device 1, and then insert molding the resin member into the workpiece 2, which comprises a base member (outer ring 4a in this example) that forms a workpiece 2, and a resin member (insulating layer 9a in this example) that is insert molded into the base member.

[0135] In carrying out this method of manufacturing insert molded products, in this example, in conjunction with the operation of centering the workpiece 2 using the centering device 1, a molding space 53 for insert molding the resin member is formed between the fixed mold 51, which consists of a plurality of parts including the first member 18, the movable mold 52, which consists of a plurality of parts including the second member 19, and the workpiece 2, as illustrated in Figure 6. At this time, the central axis of the fixed mold 51 and the central axis of the movable mold 52 are aligned with the central axis L of the first member 18, respectively. C By aligning them, the central axis of the centered workpiece 2 and the central axis of the molding space 53 are aligned.

[0136] In this example, detailed illustrations are omitted, but as mentioned above, the support member used when positioning the workpiece 2 radially outside the cylindrical portion 24 of the first member 18 is made up of some of the components that make up the fixed mold 51, and when the centering of the workpiece 2 is completed, the support member is retracted from the workpiece 2 so as not to interfere with the formation of the molding space 53. In other examples, the configuration can be made so as not to temporarily use the support member.

[0137] In this example, molten synthetic resin is fed into the molding space 53 through a runner and gate (not shown) provided in the movable mold 52, and then the synthetic resin is cooled and solidified inside the molding space 53 to insert mold the resin member into the workpiece 2. After that, the mold is opened by moving the movable mold 52 to the other axial side relative to the fixed mold 51, and the insert molded product (insulating layer raceway 50A) is removed.

[0138] In the manufacturing method of the insert molded product in this example, the centering device 1 can center the workpiece 2 with high precision, so the central axis of the workpiece 2 and the central axis (L) of the molding space 53 are aligned. C ) can be matched with high precision. As a result, the resin member (insulating layer 9a) can be insert-molded onto the surface of the workpiece 2 (outer ring 4a) with a uniform radial thickness over its entire circumference. Therefore, the amount of cutting of the resin member (insulating layer 9a) in the subsequent finishing process can be reduced or eliminated, that is, the amount of synthetic resin used to create the resin member (insulating layer 9a) can be sufficiently reduced, thereby achieving a lower cost for the insert-molded product (insulating layer raceway 50A). When implementing this disclosure, if a configuration is adopted in which the first member 18 is arranged to be movable in the axial direction and the second member 19 is arranged to be immovable in the axial direction, a fixed mold can be constructed using multiple parts including the second member 19, and a movable mold can be constructed using multiple parts including the first member 18.

[0139] [Second Example] A second embodiment of the embodiments of this disclosure will be described with reference to Figures 7(A) to 8(B).

[0140] In the centering device 1a of this example, the slide member 21a is supported so as to be able to move in the axial direction relative to the first member 18a. Specifically, in this example, the first member 18a has a slide guide portion 37 that extends from the radially opposite side of the base portion 23 toward the axially opposite side. The slide member 21a is positioned between the inner circumferential surface of the cylindrical portion 24 constituting the first member 18a and the outer circumferential surface of the slide guide portion 37. The slide member 21a is supported so as to be able to move in the axial direction relative to the first member 18a by being fitted onto the slide guide portion 37 so as to be able to move in the axial direction without radial play.

[0141] In this example, the sliding member 21a is prevented from rotating relative to the first member 18a by an anti-rotation mechanism (not shown). The anti-rotation mechanism can have any configuration, and can be configured, for example, by spline engagement, engagement between an axial guide groove and a guide projection, or engagement between an axial guide pin and a guide hole.

[0142] In this example, each centering member 20a has a rectangular contour shape when viewed from the radial direction. Each guide hole 25a provided in the cylindrical portion 24 of the first member 18a has a rectangular contour shape when viewed from the radial direction. Each centering member 20a is fitted inside the guide hole 25a without rattling, allowing movement only in the radial direction.

[0143] In this example, the guided portion 30a of each centering member 20a is composed of a guided inclined surface that is in surface contact with the guided inclined surface that constitutes the guide portion 32 of the slide member 21a. That is, in this example, the guided inclined surface that constitutes the guided portion 30a is composed of a plane that is inclined in a direction that moves radially toward the other side as it moves toward one side in the axial direction, similar to the guide portion 32 of the slide member 21a. In this example, the guided portion 30a is provided on the axial side portion of the axial side of the axial side of each centering member 20a.

[0144] In this example, the pressing portion 31a of each centering member 20a is composed of a surface having a linear cross-sectional shape that extends in the axial direction. Specifically, the pressing portion 31a is along the central axis L C It is composed of a partial cylindrical surface centered on the 5a, and the radius of curvature of this partial cylindrical surface is set to be less than or equal to the radius of curvature of the cylindrical surface portion adjacent to both sides of the axial direction of the raceway 5a on the inner circumferential surface of the workpiece 2 (outer ring 4a). In this example, when centering the workpiece 2, as in the example shown in Figure 5(D), the pressing portion 31a is pressed against the cylindrical shoulder portion adjacent to both sides of the axial direction of the raceway 5a on the inner circumferential surface of the workpiece 2, as shown in Figure 7(B).

[0145] In this example, the second member 19a is located along the central axis L C It has a hollow circular plate-shaped substrate portion 28 centered on the surface, but it does not have a cylindrical portion extending from one radial end of the substrate portion 28 toward the axial direction.

[0146] In this example, the biasing spring 22 is positioned between the bottom surface of the holding hole 33 of the slide member 21 and the side surface on one axial side of the pressing member 38, which is fitted into the opening end of the holding hole 33 so as to be movable in the axial direction. As shown in Figure 7(A), with the second member 19a retracted to the other axial side relative to the first member 18a, the other axial side portion of the pressing member 38 protrudes from the holding hole 33 to the other axial side. In this example, when centering the workpiece 2, as shown in Figures 7(A) to 7(B), the first member 18a and the second member 19a are brought closer to each other in the axial direction, so that one axial side of the base portion 28 of the second member 19a comes into contact with the other axial side of the pressing member 38, and the biasing spring 22 is elastically compressed between the bottom surface of the holding hole 33 and one axial side of the pressing member 38, thereby biasing the slide member 21a toward one axial direction relative to the second member 19a by the biasing spring 22.

[0147] The centering device 1a in this example does not have a stopper mechanism to restrict the amount of axial movement of the slide member 21a relative to the second member 19a in one direction. Therefore, it is not possible to move the slide member 21a in the other direction in the axial direction in synchronization with the second member 19a using such a stopper mechanism.

[0148] Instead, the centering device 1a in this example includes an axial return spring 39 positioned between the first member 18a and the slide member 21a, which elastically biases the slide member 21a toward the other axial direction relative to the first member 18a. In this example, as shown from Figure 7(B) to Figure 7(A), when the second member 19a is moved toward the other axial direction from the centered state of the workpiece 2, the biasing force of the axial return spring 39 causes the slide member 21a to move toward the other axial direction relative to the first member 18a.

[0149] Furthermore, when centering the workpiece 2, it is necessary to ensure that the biasing force of the biasing spring 22 allows the slide member 21a to move axially to one side relative to the first member 18a, against the biasing force of the axial return spring 39. For this reason, the spring constant of the axial return spring 39 is set to a value smaller than the spring constant of the biasing spring 22.

[0150] The axial return spring 39 can elastically bias the slide member 21 axially toward the other side relative to the first member 18a, and as long as it has a spring constant smaller than the spring constant of the biasing spring 22, its type, shape, and installation location are arbitrary, and it can be composed of one axial return spring 39 or multiple axial return springs 39.

[0151] In this example, the axial return spring 39 is composed of multiple axial return springs 39, each consisting of a coil spring (three in this example).

[0152] Each axial return spring 39 is positioned at the same circumferential position as the centering member 20a. In this example, the base portion 23 of the first member 18a has a plurality of retaining holes 40, each positioned at the same circumferential position as the centering member 20a and opening only on the other axial side. Each axial return spring 39 is held between the bottom surface of the retaining hole 40 and the side surface of the slide member 21a on one axial side, with one axial end positioned inside the retaining hole 40. As shown in Figure 7(B), each axial return spring 39 is elastically compressed between the bottom surface of the retaining hole 40 and the side surface of the slide member 21a on one axial side, thereby elastically biasing the slide member 21a toward the other axial side relative to the first member 18a.

[0153] The centering device 1a in this example includes a guide groove 41 and a guide projection 42. The guide groove 41 is provided on one of the centering members 20a and the slide member 21a, extends radially from one axial direction to the other, and its circumferential width is wider at the bottom side in the depth direction than at the opening side. The guide projection 42 is provided on the other of the centering members 20a and the slide member 21a, and engages with the guide groove 41 in a way that allows movement in the extension direction of the guide groove 41, but prevents it from coming out through the opening in the depth direction of the guide groove 41. In this example, as shown from Figure 7(B) to Figure 7(A), when the second member 19a is moved to the other axial direction from the centered state of the workpiece 2, the centering members 20a can be moved radially to the other side, i.e., retracted into the inside of the guide hole 25a, based on the engagement between the guide groove 41 and the guide projection 42.

[0154] In this example, the guide groove 41 is provided on the slide member 21a. Specifically, the guide groove 41 is formed in the circumferential center of the guide inclined surface that constitutes the guide portion 32 of the slide member 21a, extending along the inclination direction of the guide inclined surface. Furthermore, when the guide groove 41 is cut by a virtual plane perpendicular to its extension direction, it has a T-shaped cross-section in which the width dimension in the circumferential direction is wider at the bottom side in the depth direction than at the opening side.

[0155] In this example, the guide projection 42 is provided on each centering member 20a. Specifically, the guide projection 42 protrudes from the circumferential center of the guided inclined surface that constitutes the guided portion 30a of each centering member 20a, and is formed to extend along the inclination direction of the guided inclined surface. Furthermore, when the guide projection 42 is cut by a virtual plane perpendicular to its extension direction, it has a T-shaped cross-section in which the width dimension in the circumferential direction is wider at the tip end in its protruding direction than at the base end.

[0156] The other configurations and effects of the second embodiment are the same as those of the first embodiment.

[0157] [Third Embodiment] A third embodiment of the embodiments of this disclosure will be described with reference to Figures 9(A) to 10(C).

[0158] In the centering device 1b of this example, the slide member 21b does not have a guide groove, and each centering member 20b does not have a guide projection.

[0159] Instead, the centering device 1b in this example is equipped with a radial return spring 43 positioned between the first member 18b and each of the multiple centering members 20b, which elastically biases the centering members 20b toward the other radial direction relative to the first member 18b. In this example, as shown from Figure 9(B) to Figure 9(A), when the second member 19a is moved toward the other axial direction from the centered state of the workpiece 2, the biasing force of the radial return spring 43 causes each centering member 20b to move toward the other radial direction relative to the first member 18b, that is, to be retracted into the guide hole 25b.

[0160] Furthermore, when centering the workpiece 2, it is necessary to ensure that the centering member 20b can be moved radially to one side against the biasing force of the radial return spring 43 by a force that pushes the centering member 20b radially to one side, based on the difference between the biasing force of the biasing spring 22 and the biasing force of the axial return spring 39. For this reason, the spring constant of the radial return spring 43 is set to a value that enables such movement of the centering member 20b radially to one side.

[0161] The radial return spring 43 can elastically bias the centering member 20b radially toward the other side relative to the first member 18b, and as long as it has the spring constant described above, its type, shape, and installation location are arbitrary, and it can be composed of one radial return spring 43 or multiple radial return springs 43 for each centering member 20b.

[0162] In this example, the radial return spring 43 is composed of multiple radial return springs 43 (two in this example), each of which is a coil spring, for each centering member 20b.

[0163] In this example, the guide hole 25b of the first member 18b has a wide hole portion 44 that constitutes its radially inner portion and a narrow hole portion 45 that constitutes its radially outer portion and has a circumferential width smaller than the circumferential width of the wide hole portion 44. The circumferential sides of the inner surface of the wide hole portion 44 and the circumferential sides of the inner surface of the narrow hole portion 45 are connected by stepped surfaces 46 facing the other radial side.

[0164] In this example, each centering member 20b has a wide portion 47 that constitutes its radially inner portion and a narrow portion 48 that constitutes its radially outer portion and has a circumferential width smaller than the circumferential width of the wide portion 47. The circumferential sides of the wide portion 47 and the circumferential sides of the narrow portion 48 are connected by stepped surfaces 49 facing one radial side. The wide portion 47 is positioned inside the wide hole portion 44 of the guide hole 25b. The narrow portion 48 is inserted through the narrow hole portion 45 of the guide hole 25b.

[0165] In this example, each radial return spring 43 is positioned inside the wide hole portion 44 of the guide hole 25b and on both sides in the circumferential direction of the narrow portion 48 of the centering member 20b, and is sandwiched between the stepped surface 46 of the guide hole 25b and the stepped surface 49 of the centering member 20b. As shown in Figure 9(B), each radial return spring 43 is elastically compressed between the stepped surface 46 and the stepped surface 49, thereby elastically biasing the centering member 20b toward the other radial direction.

[0166] The other configurations and effects of the third embodiment are the same as those of the first and second embodiments.

[0167] [Fourth embodiment] A fourth embodiment of the embodiments of this disclosure will be described with reference to Figures 11(A) and 11(B).

[0168] This example is one instance of a centering device according to one aspect of the present disclosure, where one side in the radial direction is oriented radially inward.

[0169] Specifically, the centering device 1c in this example has a structure in which the internal and external configurations in the radial direction are reversed compared to the centering device 1 in the first example. In this example, the reference numerals for each component constituting the centering device 1c are the same as the reference numerals for the corresponding components in the centering device 1 in the first example, with the subscript "A" added.

[0170] In this example, the target insert molded product is an insulating layered raceway ring 50B having an inner ring 6b and an insulating layer 9b, as shown in Figure 1(B), and the target workpiece 2A is the inner ring 6b. In this example, the radius of the ball constituting each centering member 20A, that is, the radius of curvature of the cross-sectional shape of the surface of the ball, is made smaller than the radius of curvature of the cross-sectional shape of the raceway 7a of the inner ring 6b. In this example, as shown in Figure 11(B), the workpiece 2A is centered by pressing the pressing portion 31A of each centering member 20A against the bottom of the groove of the raceway 7a.

[0171] The other configurations and effects of the fourth embodiment are the same as those of the first embodiment.

[0172] Furthermore, when implementing a centering device according to one embodiment of this disclosure, it is also possible to adopt a structure in which the internal and external configurations in the radial direction are reversed compared with the centering devices 1a and 1b of the second and third embodiments.

[0173] The structures of the first to fourth embodiments of the embodiments of this disclosure described above, as well as structures in which the internal and external configurations in the radial direction are reversed compared to the second and third embodiments, can be implemented in appropriate combinations as long as no inconsistencies arise.

[0174] In mechanical devices and / or vehicles, bearings are used where relative rotation occurs between two members. In one example, a mechanical device comprises a device body having a frame member and / or a base member, and a rotating part provided on the device body. The rotating part comprises a support, a bearing supported by the support, and a rotating body (such as a shaft) rotatably supported by the support via the bearing. For example, the mechanical device may include a motor. In another example, a vehicle comprises a vehicle body having a frame member and / or a base member, and a rotating part provided on the vehicle body. The rotating part comprises a support, a bearing supported by the support, and a rotating body (such as a shaft) rotatably supported by the support via the bearing. For example, a vehicle may include a mechanical device having a motor and / or a rotating part.

[0175] The bearing element or bearing can be applied to the rotational support parts of machines with rotating parts, various manufacturing equipment, such as screw devices like ball screw devices, and linear motion devices such as actuators (combinations of linear guide bearings and ball screws, XY tables, etc.). Furthermore, the bearing element or bearing can be applied to steering devices such as wipers, power windows, electric doors, electric seats, steering columns (e.g., electric tilt-telescopic steering columns), universal joints, intermediate gears, rack and pinion systems, electric power steering devices, and worm gear reducers. In addition, the bearing element or bearing can be applied to various vehicles such as automobiles, motorcycles, and railways. This bearing configuration can be suitably applied to any point of relative rotation, leading to improved product quality and reduced costs.

[0176] The technical scope of the present invention is not limited to the scope described in the embodiments. Various modifications or improvements can be made to the embodiments. Such modified or improved forms may also be included within the technical scope of the present invention. Furthermore, the invention is not limited to the embodiments described, but may include any combination of these configurations. [Explanation of Symbols]

[0177] 1, 1a, 1b, 1A Centering device 2, 2A Workpiece 3a, 3b, 3c, 3d Rolling bearings 4a, 4b, 4c, 4d outer ring 5a, 5b orbit 6a, 6b, 6c, 6d inner ring 7a, 7b orbit 8a, 8b Rolling elements 9a, 9b Insulating layer 10 Guard section 11 Guard section 12 Electrical equipment 13 Rotation axis 14 Housing 15 rotors 16 staters 17 Rolling bearings 18, 18a, 18b, 18A First member 19, 19a, 19A Second member 20, 20a, 20b, 20A Centering members 21, 21a, 21b, 21A Slide members 22, 22A Biasing spring (first biasing means, first biasing body, first biasing mechanism) 23, 23A board part 24, 24A cylinder part Guide holes 25, 25a, 25b, 25A 26, 26A Concave curved part 27, 27A protrusion 28, 28A Circuit board section 29, 29A cylinder part 30, 30a, 30A Guided part (2nd surface, 2nd contact surface, guided surface, working surface) 31, 31a, 31A Pressing portion (third surface, third contact surface, pressing surface) 32, 32A Guide section (first surface, first contact surface, guide surface, driven surface) 33, 33A holding hole 34, 34A Stopper mechanism 35, 36A Second member side flange 36, 37A Side flange portion of slide member 37 Slide guide section 38 Pressing member 39 Axial return spring (first biasing means, first biasing body, first biasing mechanism) 40 Retaining hole 41 Guide groove 42 Guide protrusions 43 Radial return spring (second biasing means, second biasing body, second biasing mechanism) 44 Wide hole section 45 Narrow hole part 46 Step surface 47 Wide section 48 Narrow part 49 Step surface 50A, 50B, 50C, 50D Insulated Raceway Rings 51 Fixed type 52 Movable type 53 Molding space 70 Conversion mechanism 80. Insert molding machine (machine for manufacturing insert molded products) 82 Supply device

Claims

1. Positioning a ring-shaped and / or cylindrical workpiece relative to a reference axis using a centering device, Supplying molding material to the molding space between the mold and the workpiece, Includes, The aforementioned centering device is A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, Each of the plurality of centering members includes a spherical body, A method for manufacturing insert molded products.

2. Positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis using a centering device, Supplying molding material to the molding space between the mold and the workpiece, Includes, The aforementioned centering device is A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, The conversion mechanism includes one or more first surfaces provided on the slide member and a plurality of second surfaces provided on each of the plurality of centering members, The one or more first surfaces and the plurality of second surfaces allow relative sliding and / or relative rolling. Each of the plurality of second surfaces includes a curved surface about a first axis parallel to the reference axis, a curved surface about a second axis perpendicular to the first axis, and / or a part of a sphere. A method for manufacturing insert molded products.

3. Molding mold and, A centering device for positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis, A supply device for supplying molding material to the molding space between the mold and the workpiece, Equipped with, The aforementioned centering device is A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, Each of the plurality of centering members includes a spherical body, Manufacturing equipment for insert molded products.

4. A mold and A centering device for positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis, A supply device for supplying molding material to the molding space between the mold and the workpiece, Equipped with, The aforementioned centering device is A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, The conversion mechanism includes one or more first surfaces provided on the slide member and a plurality of second surfaces provided on each of the plurality of centering members, The one or more first surfaces and the plurality of second surfaces allow relative sliding and / or relative rolling. Each of the plurality of second surfaces includes a curved surface about a first axis parallel to the reference axis, a curved surface about a second axis perpendicular to the first axis, and / or a part of a sphere. Manufacturing equipment.

5. The conversion mechanism converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members by a cam action and / or wedge action between the one or more first surfaces and the multiple second surfaces. The manufacturing apparatus according to claim 4.

6. The one or more first surfaces are formed continuously or intermittently on the slide member as a single unit. The manufacturing apparatus according to claim 4.

7. The one or more first surfaces include a curved surface formed in the circumferential direction about the central axis, or include a tangent plane to the circumference about the central axis. A manufacturing apparatus according to any one of claims 4 to 6.

8. In the conversion described above, the radial displacement of each of the plurality of centering members is less than or equal to the axial displacement of the slide member. A manufacturing apparatus according to any one of claims 4 to 6.

9. A centering device for positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis, A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, Each of the plurality of centering members includes a spherical body, Centering device.

10. A centering device for positioning a ring-shaped and / or cylindrical workpiece with respect to a reference axis, A sliding member that can move along an axial direction parallel to the reference axis, A plurality of centering members are arranged spaced apart from each other around the reference axis and are each movable along the radial direction, A conversion mechanism that converts the axial force applied to the slide member into multiple radial forces applied to each of the multiple centering members, Equipped with, The conversion mechanism includes one or more first surfaces provided on the slide member and a plurality of second surfaces provided on each of the plurality of centering members, The one or more first surfaces and the plurality of second surfaces allow relative sliding and / or relative rolling. Each of the plurality of second surfaces includes a curved surface about a first axis parallel to the reference axis, a curved surface about a second axis perpendicular to the first axis, and / or a part of a sphere. Centering device.

11. A centering method for centering a workpiece using the centering device described in claim 9 or 10.

12. A method for manufacturing an insert molded product comprising a base member and a resin member that is insert-molded onto the base member, A method for manufacturing an insert molded product, comprising centering the base member which will become the workpiece using the centering method described in claim 11, and then insert molding the resin member into the base member.

13. The base member is a raceway ring that constitutes a rolling bearing and has a raceway on its inner or outer surface, The method for manufacturing an insert molded product according to claim 12, wherein the resin member is an insulating layer that covers the portion of the surface of the raceway ring that is outside the raceway.

14. A method for manufacturing a rolling bearing comprising: an outer ring having a raceway on its inner circumference; an inner ring having a raceway on its outer circumference; a plurality of rolling elements rotatably arranged between the raceway of the outer ring and the raceway of the inner ring; and an insulating layer covering the portion of the surface of at least one of the raceway rings, which is outside the raceway; A method for manufacturing a rolling bearing, comprising the step of manufacturing an insert molded product comprising the raceway ring and the insulating layer by the method for manufacturing an insert molded product according to claim 1 or 2.

15. A method for manufacturing electrical equipment equipped with rolling bearings, A method for manufacturing electrical equipment, comprising the step of manufacturing a rolling bearing by the method for manufacturing a rolling bearing described in claim 14.

16. A method for manufacturing a vehicle equipped with rolling bearings, A method for manufacturing a vehicle, comprising the step of manufacturing a rolling bearing by the method for manufacturing a rolling bearing described in claim 14.

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