Composite structural rotating body

Abstract

To provide a composite structure rotating body which can inhibit defective manufacture and secure sufficient vibration damping performance.SOLUTION: A composite structure gear 1 includes: an annular metallic bush 3; a resin annular member 5 which is provided around the metallic bush 3 and coaxially arranged with the metallic bush 3; and a metallic annular member 7 which is provided around the resin annular member 5 and arranged coaxially with the metallic bush 3. The resin annular member 5 has: multiple thin parts 55 provided along a circumferential direction and a radial direction; and multiple thick parts 57 each of which is provided between the pair of thin parts 55 and thicker than the thin part 55.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a composite structure rotating body. [Background technology]

[0002] Known technology relating to a composite structure rotating body is, for example, the gear described in Patent Document 1. The gear described in Patent Document 1 includes a metal ring-shaped body (metal ring-shaped member) with teeth formed on its outer periphery, an annular metal bushing, and a resin web (resin ring-shaped member) that connects the metal ring-shaped body and the metal bushing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-61059 Summary of the Invention [Problem to be solved by the invention]

[0004] In the composite structure rotating body component described above, it is conceivable to reduce the volume of the resin annular member in order to prevent manufacturing defects (molding defects) such as cracks from occurring in the resin annular member. However, the smaller the volume of the resin annular member, the lower the damping of vibrations propagating between the metal annular member and the metal bushing (hereinafter simply referred to as "vibrations").

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a composite structure rotating body that can suppress manufacturing defects and ensure sufficient vibration damping. [Means for solving the problem]

[0006] A composite structure rotating body according to one embodiment of the present invention comprises an annular metal bushing, a resin annular member arranged around the metal bushing and coaxial with the metal bushing, and a metal annular member arranged around the resin annular member and coaxial with the metal bushing, wherein the resin annular member has a plurality of first thick portions arranged along the circumferential and / or radial directions, and a second thick portion arranged between the pair of first thick portions and having an axial thickness thicker than that of the first thick portions.

[0007] In this composite structure rotating body, the multiple first thick portions that are thinner than the second thick portions effectively reduce the volume of the resin annular member, preventing manufacturing defects, and the second thick portions that are thicker than the first thick portions prevent excessive reduction in vibration damping. In other words, it is possible to prevent manufacturing defects and ensure sufficient vibration damping.

[0008] In a composite structure rotating body according to one aspect of the present invention, the second thick portion may include an annular thick portion that is provided so as to protrude in the axial direction more than the first thick portion and is coaxial with the metal bushing. In the composite structure rotating body according to one aspect of the present invention, the annular thick portion may extend in an annular shape between the metal bushing and the metal annular member when viewed in the axial direction. In this case, the annular thick portion can effectively increase vibration damping.

[0009] In a composite structure rotating body according to one aspect of the present invention, the second thick portion may be provided so as to protrude in the axial direction more than the first thick portion and may include radial thick portions extending radially. In a composite structure rotating body according to one aspect of the present invention, the radial thick portions may be provided in plurality so as to be arranged at equal intervals in the circumferential direction and extend along the radial direction. In this case, the radial thick portions can effectively increase the rigidity of the resin annular member.

[0010] In the composite structure rotating body according to one aspect of the present invention, the resin annular member may have an inner peripheral portion that engages with the metal bushing and an outer peripheral portion that engages with the metal annular member, in which case the resin annular member can be connected to the metal bushing by the inner peripheral portion and the resin annular member can be connected to the metal annular member by the outer peripheral portion.

[0011] In a composite structure rotating body according to one aspect of the present invention, the second thick portion may include a bent portion that bulges radially or circumferentially as viewed from the axial direction on either one side or the other side of the annular resin member. In this case, for example, when the annular resin member is obtained by resin molding, the space inside the bent portion can be used as a relief for an ejector pin that abuts during the molding. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a composite structure rotating body that can suppress manufacturing defects and ensure sufficient vibration damping properties. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a front view of a composite structure gear according to an embodiment. [Figure 2] FIG. 2 is a rear view of the composite structure gear of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 4 is a front view of a composite structure gear according to a first modified example. [Figure 5] FIG. 5 is a front view of a composite structure gear according to a second modified example. [Figure 6] FIG. 6 is a front view of a composite structure gear according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0015] FIG. 1 is a front view of the composite structure gear 1. FIG. 2 is a rear view of the composite structure gear 1. FIG. 3 is a cross-sectional view taken along line AA in FIG. 1. As shown in FIGS. 1, 2, and 3, the composite structure gear 1 is a so-called hybrid gear made of resin and metal, and is used, for example, as a gear for vehicles and industrial applications. The composite structure gear 1 includes a metal bushing 3, a resin annular member 5, and a metal annular member 7. The composite structure gear 1 is a spur gear.

[0016] The metal bushing 3 is a component that is attached to, for example, a rotating shaft (not shown). The metal bushing 3 is annular. The metal bushing 3 is formed of, for example, a metal such as carbon steel. A through hole 3h is provided in the metal bushing 3. The through hole 3h passes through the metal bushing 3 in the axial direction. A rotating shaft is inserted into the through hole 3h. A plurality of protrusions 31 are formed on the outer surface of the metal bushing 3 at predetermined intervals in the circumferential direction. The protrusions 31 are recessed into the resin annular member 5. The protrusions 31 have the function of preventing the resin annular member 5 from rotating and coming off relative to the metal bushing 3.

[0017] The resin annular member 5 is provided between the metal bushing 3 and the metal annular member 7. The resin annular member 5 is a member that damps vibrations propagating between, for example, the metal annular member 7 and the metal bushing 3. Vibrations include those caused by impacts generated when the composite structure gear 1 meshes with other gears. The resin annular member 5 absorbs and damps vibrations through its elastic deformation. The resin annular member 5 is annular and coaxial with the metal bushing 3. The resin annular member 5 is provided around the metal bushing 3. Here, the resin annular member 5 is provided so as to be in contact with the outer peripheral surface of the metal bushing 3. Note that being provided around the metal bushing 3 includes not only being provided so as to be in contact with the metal bushing 3, but also being provided around the metal bushing 3 via another member.

[0018] The resin annular member 5 is formed from a resin material. Examples of resin materials that can be used include thermosetting resins such as phenolic resin, polyaminoamide resin, epoxy resin, melamine resin, urea resin, and unsaturated polyester resin, and thermoplastic resins such as polyamide resin, polyacetal resin, polycarbonate resin, polyphenylene ether resin, polyethylene terephthalate resin, polybutylene terephthalate resin, cyclic polyolefin resin, polyphenylene sulfide resin, polytetrafluoroethylene resin, polysulfone resin, polyethersulfone resin, amorphous polyarylate resin, liquid crystal polymer resin, and polyetheretherketone resin. The resin annular member 5 can be manufactured using a resin molding method. The resin molding method is not particularly limited, and various known methods can be used. The end face of the resin annular member 5 is seamlessly connected to the end face of the metal bushing 3.

[0019] The metal annular member 7 is a member that meshes with other gears. The metal annular member 7 is annular and coaxial with the metal bushing 3. The metal annular member 7 is made of a metal such as carbon steel. The metal annular member 7 is provided around the metal bushing 3, and ultimately around the resin annular member 5. Here, the metal annular member 7 is provided so as to contact the outer circumferential surface of the resin annular member 5. Note that being provided around the resin annular member 5 does not only mean being provided so as to directly contact the periphery of the resin annular member 5, but also includes being provided around the resin annular member 5 via another member. A tooth profile 7a is formed on the outer periphery of the metal annular member 7. A plurality of tooth profiles 7a are formed at predetermined intervals in the circumferential direction of the metal annular member 7.

[0020] The metal annular member 7 has a larger axial thickness (dimension in the axial direction, hereinafter simply referred to as "thickness") than the metal bushing 3. A plurality of protrusions 71 are formed on the inner peripheral surface of the metal annular member 7 at predetermined intervals in the circumferential direction. The protrusions 71 are recessed into the resin annular member 5. The protrusions 71 function to prevent the resin annular member 5 from rotating and coming off relative to the metal annular member 7. The end face of the metal annular member 7 is connected to the end face of the resin annular member 5 without any steps.

[0021] In the composite structure gear 1 of this embodiment, the resin annular member 5 has an inner peripheral portion 51 that engages with the metal bush 3, an outer peripheral portion 53 that engages with the metal annular member 7, thin-walled portions 55 as first thick portions provided in multiple circumferential and radial directions, and thick-walled portions 57 as second thick portions that are thicker than the thin-walled portions 55.

[0022] The inner peripheral portion 51 is a cylindrical portion on the inner periphery of the resin annular member 5, and has the same thickness as the metal bushing 3. The inner peripheral portion 51 abuts against the outer periphery surface of the metal bushing 3. The protrusions 31 of the metal bushing 3 fit into the inner peripheral portion 51. The inner peripheral portion 51 is joined to the outer periphery surface of the metal bushing 3.

[0023] The outer peripheral portion 53 is a cylindrical portion on the outer peripheral side of the resin annular member 5, and has the same thickness as the metal annular member 7. The outer peripheral portion 53 abuts against the inner peripheral surface of the metal annular member 7. The protrusions 71 of the metal annular member 7 fit into the outer peripheral portion 53. The outer peripheral portion 53 is joined to the inner peripheral surface of the metal annular member 7.

[0024] The thin-walled portion 55 is provided between the inner peripheral portion 51 and the outer peripheral portion 53. The thin-walled portion 55 is a portion separated by adjacent thick-walled portions 57. When viewed from the axial direction, the thin-walled portions 55 are arranged at equal intervals in the circumferential direction, for example, eight thin-walled portions 55. When viewed from the axial direction, the thin-walled portions 55 are arranged at equal intervals in the radial direction, for example, two thin-walled portions 55. When viewed from the axial direction, the thin-walled portions 55 have an annular sector shape (arch shape). The thin-walled portions 55 have a thickness thinner than the minimum thickness of the thick-walled portions 57. The thin-walled portions 55 have a constant thickness.

[0025] The thick-walled portion 57 is provided between a pair of adjacent thin-walled portions 55. The thick-walled portion 57 is provided between the inner peripheral portion 51 and the outer peripheral portion 53 so as to protrude in the axial direction beyond the thin-walled portion 55. The thick-walled portion 57 includes an annular thick-walled portion 57a ​​coaxial with the metal bushing 3 and multiple radial thick-walled portions 57b extending radially. When viewed from the axial direction, the annular thick-walled portion 57a ​​extends in an annular shape at the center between the metal bushing 3 and the metal annular member 7. When viewed from the axial direction, the multiple radial thick-walled portions 57b extend radially and are provided so as to be evenly spaced circumferentially. The thick-walled portions 57 are provided so that their thickness decreases radially outward (see FIG. 3). The end faces of the thick-walled portions 57 are inclined surfaces that slope axially inward as they extend radially outward.

[0026] 1, on only one axial side of the annular resin member 5, the thick-walled portion 57 includes a bent portion 57c that bends so as to bulge radially outward as viewed in the axial direction. A plurality of bent portions 57c are provided in the annular thick-walled portion 57a, positioned centrally between the radially thick-walled portions 57b adjacent in the circumferential direction. As viewed in the axial direction, a contact surface 58 against which an ejector pin abuts during resin molding is formed in an area of ​​the end face of the thin-walled portion 55 defined radially inward of the bent portion 57c.

[0027] As described above, in the composite structure gear 1, the volume of the resin annular member 5 is effectively reduced by the multiple thin-walled portions 55 that are thinner than the thick-walled portions 57, and the occurrence of manufacturing defects is suppressed, while the thick-walled portions 57 that are thicker than the thin-walled portions 55 prevent the vibration damping performance from decreasing too much. In other words, it is possible to suppress manufacturing defects and ensure sufficient vibration damping performance.

[0028] In the composite structure gear 1, the thick-walled portion 57 includes an annular thick-walled portion 57a ​​that protrudes in the axial direction further than the thin-walled portion 55. When viewed in the axial direction, the annular thick-walled portion 57a ​​extends in an annular shape between the metal bushing 3 and the metal annular member 7. In this case, the annular thick-walled portion 57a ​​can effectively increase the vibration damping property.

[0029] In the composite structure gear 1, the thick-walled portion 57 includes radially thick-walled portions 57b that protrude in the axial direction beyond the thin-walled portion 55. The radially thick-walled portions 57b are arranged at equal intervals in the circumferential direction and extend radially. In this case, the radially thick-walled portions 57b can effectively increase the rigidity of the resin annular member 5.

[0030] In the composite structure gear 1, the resin annular member 5 has an inner peripheral portion 51 that engages with the metal bushing 3 and an outer peripheral portion 53 that engages with the metal annular member 7. In this case, the resin annular member 5 can be connected to the metal bushing 3 by the inner peripheral portion 51, and the resin annular member 5 can be connected to the metal annular member 7 by the outer peripheral portion 53.

[0031] In the composite structure gear 1, the thick-walled portion 57 includes a bent portion 57c (see FIG. 1) only on one end face side (one axial side) of the resin annular member 5. In this case, when the resin annular member 5 is molded by resin molding, the space inside the bent portion 57c can be used as a relief for an ejector pin that hits the molded product (resin annular member 5) to remove it from the mold during molding.

[0032] In the composite structure gear 1, the presence of the thin-walled portions 55 and the thick-walled portions 57 forms multiple irregularities on one end face side and the other end face side of the composite structure gear 1. These multiple irregularities also make it possible to absorb meshing noise generated when the composite structure gear 1 meshes with other gears.

[0033] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0034] FIG. 4 is a front view of a composite structure gear 101 according to a first modified example. As shown in FIG. 4, the composite structure gear 101 according to the first modified example differs from the composite structure gear 1 (see FIG. 1) in that it does not have radial thick portions 57b. In this case, the thin portions 55 have an annular shape and are provided in multiple locations in the radial direction. Even with this composite structure gear 101, it is possible to suppress manufacturing defects and ensure sufficient vibration damping.

[0035] Fig. 5 is a front view of a composite structure gear 201 according to a second modified example. As shown in Fig. 5, the composite structure gear 201 according to the second modified example differs from the composite structure gear 1 (see Fig. 1) in that it does not have an annular thick portion 57a. In this case, the thin portion 55 has an annular sector shape and is provided in multiple portions in the circumferential direction. Even with this composite structure gear 101, it is possible to suppress manufacturing defects and ensure sufficient vibration damping.

[0036] Fig. 6 is a front view of a composite structure gear 301 according to a third modified example. As shown in Fig. 6, the composite structure gear 301 according to the third modified example differs from the composite structure gear 1 (see Fig. 1) in that it has multiple rows of annular thick portions 57a. In this way, the number of annular thick portions 57a is not particularly limited, and the composite structure gear 301 can also suppress manufacturing defects and ensure sufficient vibration damping.

[0037] In the above embodiment and modified examples, the composite structure gear 1 is described as a spur gear as an example, but the composite structure gear 1 may be a helical gear, etc. In the above embodiment and modified examples, the composite structure gear 1 is described as a composite structure rotating body, but is not limited to a gear and may be, for example, a flywheel, etc. In the above embodiment and modified examples, the metal bushing 3, the resin annular member 5, and the metal annular member 7 are annular, but are not limited to annular, and may be any annular shape. In the above embodiment and modified examples, the resin annular member 5 may be composed of multiple members (rubber layers). In the above embodiment and modified examples, the number of radial thick portions 57b is not limited and may be one or multiple.

[0038] The respective components in the above-described embodiments and modifications are not limited to the materials and shapes described above, and various materials and shapes can be applied. Furthermore, the respective components in the above-described embodiments and modifications can be arbitrarily applied to the respective components in other embodiments or modifications. [Explanation of symbols]

[0039] 1,101,201,301...Composite structure gear (composite structure rotating body), 3...metal bushing, 5...resin annular member, 7...metal annular member, 51...inner peripheral portion, 53...outer peripheral portion, 55...thin-walled portion (first thick portion), 57...thick-walled portion (second thick portion), 57a...annular thick portion, 57b...radial thick portion, 57c...curved portion.

Claims

1. an annular metal bush; a resin annular member provided around the metal bush and coaxial with the metal bush; a metal annular member provided around the resin annular member and coaxial with the metal bushing, The resin annular member is a plurality of first thick portions provided along the circumferential direction and / or the radial direction; a second thick portion provided between the pair of first thick portions and having an axial thickness greater than that of the first thick portions, the second thick portion is provided so as to protrude in the axial direction more than the first thick portion and includes an annular thick portion coaxial with the metal bushing, the annular thick-walled portion extends annularly between the metal bushing and the metal annular member when viewed in the axial direction, the annular thick-walled portion includes, on one axial side of the resin annular member, a bent portion that extends in a circumferential direction while bending so as to bulge radially outward as viewed in the axial direction, The first thick portion has a constant thickness, The second thick portion including the bent portion is provided so that its thickness decreases radially outward.

2. the second thick portion includes a plurality of radial thick portions extending radially along a radial direction and arranged in a circumferential direction, The composite structure rotating body according to claim 1 , wherein the bent portion is provided so as to be positioned between a pair of the radially thick portions adjacent in the circumferential direction.

3. 3. The composite structure rotating body according to claim 1, wherein the resin annular member has an inner peripheral portion that engages with the metal bushing and an outer peripheral portion that engages with the metal annular member.

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