JP2019108947A - Resin gear - Google Patents

Abstract

To provide a resin gear capable of maintaining an attenuation function even under oil lubrication.SOLUTION: A resin gear 1 comprises: an annular metal bush 3; an annular resin member 7 provided around the metal bush 3, and formed with a tooth form 7x; and an elastic member 5 provided between the metal bush 3 and the resin member 7. The elastic member 5 has first contact parts 51a, 51b contracting with one end surface 3a and the other end surface 3b of the metal bush 3, and second contact parts 52a, 52b contacting with one end surface 7a and the other end surface 7b of the resin member 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a resin gear.

  A resin gear is lightweight and excellent in quietness, and is widely used as, for example, a gear for vehicles or for industry. As a resin gear, an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on an outer peripheral portion, an elastic member provided between the metal bush and the resin member And resin gears are known (see, for example, Patent Document 1).

Unexamined-Japanese-Patent No. 2017-151000

  In the resin gear as described above, when an impact occurs due to meshing with another gear, the elastic deformation of the elastic member absorbs and attenuates the impact, that is, the damping function of the elastic member acts. However, under oil lubrication lubricated by oil, oil intrusion (hereinafter, also simply referred to as "oil intrusion") occurs between the elastic member and the metal bush or between the elastic member and the resin member. there is a possibility. As the oil penetration progresses, the elastic member is deteriorated, and in turn, the deterioration of the elastic member progresses until it adversely affects the damping function, making it difficult to maintain the damping function.

  Therefore, an object of the present invention is to provide a resin gear which can maintain the damping function even under oil lubrication.

  The resin gear according to one aspect of the present invention includes an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on the outer periphery, a metal bush and a resin member An elastic member provided between the elastic member, the elastic member being at least one of a first contact portion in contact with the axial end face of the metal bush and a second contact portion in contact with the axial end face of the resin member Have.

  In this resin gear, when the elastic member has the first contact portion, the oil intrusion path between the elastic member and the metal bush can be extended because the first contact portion is in contact with the metal bush. When the elastic member has the second contact portion, the oil intrusion path between the elastic member and the resin member can be extended because the second contact portion is in contact with the resin member. Therefore, even if oil infiltration progresses, it becomes difficult to progress until deterioration of the elastic member adversely affects the damping function, and the damping function can be maintained. That is, it is possible to maintain the damping function even under oil lubrication.

  In the resin gear according to one aspect of the present invention, the first contact portion may extend from the outer edge to the inner edge at the axial end face of the metal bush. According to this configuration, the extension of the oil permeation path by the first contact portion can be maximized.

  In the resin gear according to one aspect of the present invention, the second contact portion may extend from the inner edge to the outer edge at the axial end face of the resin member. According to this configuration, the extension of the oil penetration path by the second contact portion can be maximized.

  In the resin gear according to one aspect of the present invention, the elastic member is provided in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member, and the outer peripheral surface of the metal bush and the inner periphery of the resin member At least one of the surface may be formed with at least one of a recess into which the elastic member is inserted and a projection into which the elastic member is inserted.

  In this configuration, when at least one of the recess and the protrusion is formed on the outer peripheral surface of the metal bush, the oil permeation path between the elastic member and the metal bushing is formed by the at least one of the recess and the protrusion. It can be stretched. When at least one of the recess and the protrusion is formed on the inner peripheral surface of the resin member, the oil permeation path between the elastic member and the resin member can be extended by at least one of the recess and the protrusion. Therefore, even if oil infiltration progresses, it becomes difficult to progress until deterioration of the elastic member adversely affects the damping function, and the damping function can be maintained.

  In the resin gear according to one aspect of the present invention, at least one of the recess and the protrusion formed on the outer peripheral surface of the metal bush may be located at an axial end of the outer peripheral surface. According to this configuration, it is difficult for oil to enter between the elastic member and the metal bush to the central portion in the axial direction of the elastic member, and the central portion is not easily deteriorated. Since the central portion constitutes a main portion that greatly contributes to the damping function, the damping function can be effectively maintained.

  In the resin gear according to one aspect of the present invention, at least one of the recess and the protrusion formed on the inner circumferential surface of the resin member may be located at an axial end of the inner circumferential surface. According to this configuration, it is difficult for oil intrusion between the elastic member and the resin member to advance to the central portion in the axial direction of the elastic member, and the central portion is hardly deteriorated. Since the central portion constitutes a main portion that greatly contributes to the damping function, the damping function can be effectively maintained.

  A resin gear according to another aspect of the present invention includes an annular metal bush, an annular resin member provided around the metal bush and having a tooth profile formed on the outer periphery, the metal bush and the resin member And the elastic member is provided in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member, and the outer peripheral surface of the metal bush and the resin member At least one of the inner peripheral surface is formed with at least one of a recess into which the elastic member is inserted and a projection into which the elastic member is inserted.

  In this resin gear, when at least one of the recess and the protrusion is formed on the outer peripheral surface of the metal bush, the oil intrudes between the elastic member and the metal bushing by at least one of the recess and the protrusion. You can extend the path. When at least one of the recess and the protrusion is formed on the inner peripheral surface of the resin member, the oil permeation path between the elastic member and the resin member can be extended by at least one of the recess and the protrusion. Therefore, even if oil penetration progresses, it is difficult to progress until deterioration of the elastic member adversely affects the damping function, and the damping function can be maintained. That is, it is possible to maintain the damping function even under oil lubrication.

  In the resin gear according to another aspect of the present invention, at least one of the recess and the protrusion formed on the outer peripheral surface of the metal bush may be located at an axial end of the outer peripheral surface. . According to this configuration, as described above, it is difficult for oil penetration to advance to the axial central portion of the elastic member, and the central portion is less likely to deteriorate, so that the damping function can be effectively maintained. .

  In the resin gear according to another aspect of the present invention, at least one of the recess and the protrusion formed on the inner circumferential surface of the resin member may be located at an axial end of the inner circumferential surface. Good. According to this configuration, as described above, it is difficult for oil penetration to advance to the axial central portion of the elastic member, and the central portion is less likely to deteriorate, so that the damping function can be effectively maintained. .

  According to the present invention, it is possible to provide a resin gear which can maintain the damping function even under oil lubrication.

FIG. 1 is a front view of a resin gear according to a first embodiment. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is an enlarged view of a part of the cross section of FIG. FIG. 4 is an enlarged view of a part of a cross section corresponding to FIG. 2 in a resin gear according to a modification of the first embodiment. FIG. 5 is an enlarged view of a part of a cross section corresponding to FIG. 2 in the resin gear according to the second embodiment. FIG. 6 is an enlarged view of a part of a cross section corresponding to FIG. 2 in a resin gear according to a modification of the second embodiment.

  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 denoted by the same reference numerals, and overlapping descriptions will be omitted.

Second Embodiment
As shown in FIGS. 1 and 2, the resin gear 1 according to the first embodiment is a so-called high-strength resin gear, and is used as a gear for a vehicle or an industry. For example, the resin gear 1 can be used as a balance shaft gear and a camshaft gear in an engine. The resin gear 1 includes a metal bush 3, an elastic member 5, and a resin member 7. The resin gear 1 is a spur gear.

  The metal bush 3 is, for example, a member attached to a rotating shaft (not shown). The metal bush 3 is annular. The metal bush 3 is formed of, for example, a metal such as stainless steel. The metal bush 3 is provided with a through hole 3 h. The through hole 3 h penetrates one end surface 3 a and the other end surface 3 b of the metal bush 3. The rotation shaft is inserted into the through hole 3 h. The metal bush 3 has an inner circumferential surface 4 a and an outer circumferential surface 4 b. The inner circumferential surface 4a defines a through hole 3h. The outer peripheral surface 4 b is a surface facing the elastic member 5.

  The elastic member 5 is a member that attenuates an impact generated when the resin gear 1 meshes with another gear. The elastic member 5 absorbs and damps the impact due to its elastic deformation. The elastic member 5 is annular. The elastic member 5 is provided around the metal bush 3. The elastic member 5 here is provided in contact with the outer circumferential surface 4 b of the metal bush 3. In addition to being provided so as to be in direct contact with the periphery of the metal bush 3, the provision of being provided around the metal bush 3 means that it is provided via another member around the metal bush 3 Including.

  The elastic member 5 is provided between the metal bush 3 and the resin member 7. The elastic member 5 is provided in contact with the inner peripheral surface of the resin member 7. The elastic member 5 may be configured by laminating a plurality of members (rubber layers). The thickness of the elastic member 5 is appropriately set. The elastic member 5 is formed of rubber. The rubber is butadiene rubber, chloroprene rubber, butyl rubber, styrene butadiene rubber, nitrile rubber, ethylene propylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber or silicone rubber. The rubber is preferably a fluororubber or a silicone rubber from the viewpoint of durability and heat resistance.

  The resin member 7 is a member that meshes with another gear. The resin member 7 is annular. The resin member 7 is formed of resin. The resin to be used may be either a thermosetting resin or a thermoplastic resin, but from the viewpoint of improving the strength of the resin gear 1 manufactured, the thermosetting resin is preferable. More specifically, epoxy resin, polyaminoamide resin, phenol resin, unsaturated polyester resin, polyimide resin, polyether sulfone resin, polyether ether ketone resin, polyamide imide resin, polyamide resin, polyester resin, polyphenylene sulfide resin, A combination of one or more resins selected from polyethylene resin, polypropylene resin and the like and a curing agent according to the type of the selected resin can be used. Among these, polyaminoamide resin is preferable from the viewpoint of strength, heat resistance, etc. of the cured resin, and a mixture 100 of 2,2 '-(1,3 phenylene) bis 2-oxazoline and amine curing agent which is excellent in heat resistance and strength. It is preferable to use, for example, a resin having 5 parts by mass or less of n-octyl bromide as a curing accelerator for the catalyst with respect to the parts by mass.

  The resin member 7 is provided around the metal bush 3 and hence around the elastic member 5. The resin member 7 here is provided in contact with the outer peripheral surface of the elastic member 5. A tooth profile 7 x is formed on the outer peripheral portion of the resin member 7. A plurality of tooth profiles 7x are formed at predetermined intervals in the circumferential direction of the resin member 7. Note that being provided around the elastic member 5 includes not only being provided to be in direct contact with the periphery of the elastic member 5 but also being provided via another member around the elastic member 5.

  In the resin gear 1 of the present embodiment, as shown in FIG. 3, one side of the metal bush 3 in the elastic member 5 in the axial direction (hereinafter simply referred to as “axial direction”) is the metal bush 3 and resin It protrudes more than the member 7 to the one side. The other axial side of the elastic member 5 protrudes to the other side than the metal bush 3 and the resin member 7. The projecting portion is expanded radially inward and in contact with the metal bush 3, and is expanded radially outward and is in contact with the resin member 7. Specifically, the elastic member 5 is configured as follows.

  The elastic member 5 has a contact portion 50a and a contact portion 50b provided in a flange shape on one side and the other side in the axial direction, respectively. The contact portion 50a includes a first contact portion 51a which is an annular portion contacting the one end surface 3a of the metal bush 3 and a second contact portion 52a which is an annular portion contacting the one end surface 7a of the resin member 7; And a connecting portion 53a connecting the first contact portion 51a and the second contact portion 52a to each other. The contact portion 50b includes a first contact portion 51b which is an annular portion contacting the other end surface 3b of the metal bush 3 and a second contact portion 52b which is an annular portion contacting the other end surface 7b of the resin member 7; And a connecting portion 53b connecting the first contact portion 51b and the second contact portion 52b to each other.

  Each of the first contact portions 51a and 51b extends in a partial region (a region from the center in the radial direction to the outer side in the illustrated example) in each of the one end surface 3a and the other end surface 3b. Each of the second contact portions 52a and 52b extends to a partial region (in the illustrated example, an inner region in the radial direction) in each of the one end surface 7a and the other end surface 7b.

  The resin gear 1 configured as described above can be manufactured using various known methods. An adhesive may be applied between the metal bush 3 and the elastic member 5.

  As described above, in the resin gear 1, since the elastic member 5 has the first contact portions 51 a and 51 b, the elastic member 5 contacts the one end surface 3 a and the other end surface 3 b of the metal bush 3. The oil penetration path between 5 and the metal bush 3 can be extended (stretched). Since the elastic member 5 has the second contact portions 52a and 52b, the second contact portions 52a and 52b contact the one end surface 7a and the other end surface 7b of the resin member 7, so that the space between the elastic member 5 and the resin member 7 The oil penetration path can be extended.

  As a result, even if oil infiltration progresses, it becomes difficult to progress until deterioration of the elastic member 5 adversely affects the damping function, and the damping function can be maintained. In particular, it is difficult for oil to penetrate to the main part (central part in the axial direction) which largely contributes to the damping function in the elastic member 5, and the deterioration of the main part can be suppressed. Therefore, according to the resin gear 1, the damping function can be maintained even under oil lubrication.

  "Oil intrusion" is the penetration of oil between target members. The “oil infiltration” includes the infiltration of oil between the elastic member 5 and the metal bush 3 and the infiltration of oil between the elastic member 5 and the resin member 7. The “oil infiltration” includes the infiltration of oil into the interface of the elastic member 5. The "oil penetration path" is the path of oil penetration.

  FIG. 4 is a cross-sectional view of a resin gear 101 according to a modification of the first embodiment. As shown in FIG. 4, the resin gear 101 may be provided with an elastic member 105 instead of the elastic member 5.

  In the elastic member 105, each of the first contact portions 51a and 51b is spread over the entire area of each of the one end surface 3a and the other end surface 3b. That is, each of the first contact portions 51a and 51b extends from the outer edge to the inner edge at each of the one end surface 3a and the other end surface 3b of the metal bush 3. Thereby, the extension of the oil penetration path by the first contact portions 51a and 51b can be maximized. In the elastic member 105, each of the second contact portions 52a and 52b extends over the entire area of each of the one end surface 7a and the other end surface 7b. That is, each of the second contact portions 52a and 52b extends from the inner edge to the outer edge at each of the one end surface 7a and the other end surface 7b of the resin member 7. Thereby, the extension of the oil penetration path by the second contact portions 52a and 52b can be maximized.

  The resin gear 1, 101 includes the first contact portions 51a, 51b and the second contact portions 52a, 52b, but may have at least one of them. The resin gear 101 is characterized in that the first contact portion 51a extends over the entire area of the end surface 3a, the first contact portion 51b extends over the entire area of the other end surface 3b, and the second contact portion 52a is over the entire area of the one end surface 7a. And the second contact portion 52b may extend over the entire area of the other end surface 7b, as long as the second contact portion 52b has at least one of these characteristics.

Second Embodiment
Next, a second embodiment will be described. Hereinafter, the description overlapping with the first embodiment will be omitted.

  As shown in FIG. 5, the resin gear 201 according to the second embodiment includes an elastic member 205. The elastic member 205 does not have the contact portion 50a and the contact portion 50b (see FIG. 3) provided on one side and the other side in the axial direction.

  In the outer peripheral surface 4 b of the metal bush 3, a recess 31 into which the elastic member 205 is inserted is formed. The recess 31 is a groove continuously extending along the outer circumferential surface 4 b in an annular shape. The recess 31 has a V-shaped cross section. The concave portion 31 is formed in a pair on the outer peripheral surface 4 b. The pair of recesses 31 are respectively located at one end and the other end in the axial direction on the outer peripheral surface 4 b.

  In the inner circumferential surface 7y of the resin member 7, a recess 71 into which the elastic member 205 is inserted is formed. The recess 71 is a groove continuously extending along the inner circumferential surface 7y in an annular shape. The recess 71 has a V-shaped cross section. The recess 71 is formed in a pair on the inner circumferential surface 7y. The pair of recesses 71 are located at one axial end and the other axial end of the inner circumferential surface 7y.

  As described above, in the resin gear 201, the oil permeation path between the elastic member 205 and the metal bush 3 can be extended by the recess 31 formed in the outer peripheral surface 4b of the metal bush 3. The oil penetration path between the elastic member 205 and the resin member 7 can be extended by the recess 71 formed on the inner peripheral surface 7 y of the resin member 7. Therefore, even if oil infiltration progresses, it becomes difficult to progress until deterioration of the elastic member 205 adversely affects the damping function, and the damping function can be maintained.

  In the resin gear 201, the recess 31 formed on the outer peripheral surface 4b of the metal bush 3 is located at an axial end of the outer peripheral surface 4b. According to this configuration, it is difficult for oil intrusion between the elastic member 205 and the metal bush 3 to advance to the axial center of the elastic member 205, and the center does not easily deteriorate. Since the central portion constitutes a main portion that greatly contributes to the damping function, the damping function can be effectively maintained.

  In the resin gear 201, the recess 71 formed on the inner peripheral surface 7y of the resin member 7 is located at an axial end of the inner peripheral surface 7y. According to this configuration, it is difficult for oil intrusion between the elastic member 205 and the resin member 7 to advance to the central portion in the axial direction of the elastic member 205, and the central portion is hardly deteriorated. As described above, since the central portion constitutes the main portion that greatly contributes to the damping function, it is possible to effectively maintain the damping function.

  FIG. 6 is a cross-sectional view of a resin gear 301 according to a modification of the second embodiment. As shown in FIG. 6, the resin gear 101 may include an elastic member 305 in place of the elastic member 205.

  The elastic member 305 has a contact portion 350a and a contact portion 350b provided in a flange shape on one side and the other side in the axial direction, respectively. The contact portion 350 a includes a first contact portion 351 a which is an annular portion contacting the one end surface 3 a of the metal bush 3 and a second contact portion 352 a which is an annular portion contacting the one end surface 7 a of the resin member 7. And a connecting portion 353a connecting the first contact portion 351a and the second contact portion 352a to each other. The contact portion 350b includes a first contact portion 351b which is an annular portion contacting the other end surface 3b of the metal bush 3 and a second contact portion 352b which is an annular portion contacting the other end surface 7b of the resin member 7; And a connecting portion 353 b connecting the first contact portion 351 b and the second contact portion 352 b to each other. Each of the first contact portions 51a and 51b extends in a partial region of each of the one end surface 3a and the other end surface 3b. Each of the second contact portions 52a and 52b extends in a partial region of each of the one end surface 7a and the other end surface 7b.

  According to such a resin gear 301, an oil intrusion path between the elastic member 305 and the metal bush 3 because the first contact portions 351a and 351b contact the one end face 3a and the other end face 3b of the metal bush 3 Can be further extended. Since the second contact portions 352 a and 352 b are in contact with the one end surface 7 a and the other end surface 7 b of the resin member 7, the oil permeation path between the elastic member 305 and the resin member 7 can be further extended. As a result, even if oil infiltration progresses, it becomes more difficult to progress until deterioration of the elastic member 305 adversely affects the damping function, and the damping function can be maintained. It is possible to maintain the damping function even under oil lubrication.

  In the resin gears 201 and 301, the pair of recesses 31 is formed on the outer peripheral surface 4b of the metal bush 3, but one or three or more recesses 31 may be formed. Although a pair of recessed parts 71 are formed in inner skin 7y of resin member 7, one or three or more recessed parts 71 may be formed. The shape of the concave portions 31 and 71 is not particularly limited, and may be one or a plurality of holes, not a groove continuously extending in an annular shape. Only one of the recesses 31 and 71 may be formed. Instead of or in addition to the recess 31, a protrusion which enters the elastic member 205 may be formed on the outer peripheral surface 4 b. Instead of or in addition to the recess 71, a protrusion which enters the elastic member 205 may be formed on the inner circumferential surface 7y. The shape of the convex portion which enters the elastic member 205 is not particularly limited, and may be various shapes. The resin gear 201 includes the first contact portions 351a and 351b and the second contact portions 352a and 352b, but may have at least one of them.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment.

  Although the resin gear 1,101,201,301 demonstrated the form which is a spur gear in the said embodiment as an example, resin gear 1,101,201,301 may be a helical gear etc. . In the present invention, the configurations of the embodiment and the modification may be combined as appropriate. The present invention can be variously modified without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 1, 101, 201, 301 ... Resin gear, 3 ... Metal bush, 3a ... One end surface (end surface), 3b ... Other end surface (end surface), 4b ... Outer peripheral surface, 5, 105, 205, 305 ... Elastic member, 7 resin member 7a end face (end face) 7b other end face (end face) 7x tooth shape 7y inner circumferential face 31, 71 recess 51a 51b 351a 351b first contact portion 52a, 52b, 352a, 352b ... second contact portion.

Claims (9)

An annular metal bush,
An annular resin member provided around the metal bush and having a tooth profile formed on an outer peripheral portion thereof;
An elastic member provided between the metal bush and the resin member;
The resin gear, wherein the elastic member has at least one of a first contact portion in contact with an axial end surface of the metal bush and a second contact portion in contact with an axial end surface of the resin member.   The resin gear according to claim 1, wherein the first contact portion extends from an outer edge to an inner edge at an axial end surface of the metal bush.   The resin gear according to claim 1, wherein the second contact portion extends from an inner edge to an outer edge at an axial end surface of the resin member. The elastic member is provided in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member,
The concave portion into which the elastic member is inserted and / or the convex portion into which the elastic member is inserted is formed on at least one of the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member. The resin gear according to any one of 3.   The resin gear according to claim 4, wherein at least one of the concave portion and the convex portion formed on the outer peripheral surface of the metal bush is located at an axial end of the outer peripheral surface.   The resin gear according to claim 4 or 5, wherein at least one of the concave portion and the convex portion formed on the inner peripheral surface of the resin member is located at an axial end of the inner peripheral surface. An annular metal bush,
An annular resin member provided around the metal bush and having a tooth profile formed on an outer peripheral portion thereof;
An elastic member provided between the metal bush and the resin member;
The elastic member is provided in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member,
A resin gear, wherein at least one of an outer peripheral surface of the metal bush and an inner peripheral surface of the resin member is formed with at least one of a concave portion into which the elastic member is inserted and a convex portion which is inserted into the elastic member.   The resin gear according to claim 7, wherein at least one of the recess and the protrusion formed on the outer peripheral surface of the metal bush is located at an axial end of the outer peripheral surface.   The resin gear according to claim 7, wherein at least one of the concave portion and the convex portion formed on the inner peripheral surface of the resin member is located at an axial end of the inner peripheral surface.

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