JP7069690B2 - Resin gears - Google Patents

Description

The present invention relates to resin gears.

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

Japanese Unexamined Patent Publication No. 2017-151000

In the resin gear as described above, when an impact is generated by meshing with another gear, the impact is absorbed and damped by the elastic deformation of the elastic member, that is, the damping function of the elastic member acts. However, under oil lubrication lubricated by oil, oil infiltration occurs between the elastic member and the metal bush or between the elastic member and the resin member (hereinafter, also simply referred to as "oil infiltration"). there is a possibility. As the oil infiltration progresses, the elastic member deteriorates, and eventually the deterioration of the elastic member progresses to an adverse effect on the damping function, and it becomes difficult to maintain the damping function.

Therefore, an object of the present invention is to provide a resin gear capable of maintaining a 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 peripheral portion thereof, and the metal bush and the resin member. It is provided with an elastic member provided between them, and the elastic member is at least one of a first contact portion in contact with the axial end surface of the metal bush and a second contact portion in contact with the axial end surface of the resin member. Has.

In this resin gear, when the elastic member has the first contact portion, the oil infiltration path between the elastic member and the metal bush can be extended by the amount that the first contact portion contacts the metal bush. When the elastic member has the second contact portion, the oil infiltration path between the elastic member and the resin member can be extended by the amount that the second contact portion is in contact with the resin member. Therefore, even if the oil infiltration progresses, it becomes difficult for the deterioration of the elastic member to progress until it 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 infiltration 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 on the axial end surface of the resin member. According to this configuration, the extension of the oil infiltration 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 so as to be 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 peripheral surface of the resin member. At least one of the surfaces may be formed with at least one of a concave portion into which the elastic member enters and a convex portion in which the elastic member enters.

In this configuration, when at least one of the concave portion and the convex portion is formed on the outer peripheral surface of the metal bush, at least one of the concave portion and the convex portion provides an oil infiltration path between the elastic member and the metal bush. Can be stretched. When at least one of the concave portion and the convex portion is formed on the inner peripheral surface of the resin member, at least one of the concave portion and the convex portion can extend the oil infiltration path between the elastic member and the resin member. Therefore, even if the oil infiltration progresses, it becomes difficult for the deterioration of the elastic member to progress until it 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 concave portion and the convex portion formed on the outer peripheral surface of the metal bush may be located at the axial end portion on the outer peripheral surface. According to this configuration, it becomes difficult for oil intrusion between the elastic member and the metal bush to proceed to the central portion in the axial direction of the elastic member, and the central portion is less likely to deteriorate. Since the central portion constitutes a main portion that greatly contributes to the damping function, it is possible to effectively maintain the damping function.

In the resin gear according to one aspect of the present invention, at least one of the concave portion and the convex portion formed on the inner peripheral surface of the resin member may be located at the axial end portion on the inner peripheral surface. According to this configuration, it becomes difficult for oil infiltration between the elastic member and the resin member to proceed to the central portion in the axial direction of the elastic member, and the central portion is less likely to deteriorate. Since the central portion constitutes a main portion that greatly contributes to the damping function, it is possible to effectively maintain the damping function.

The 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 peripheral portion, and a metal bush and a resin member. The elastic member is provided so as to be 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 are provided. At least one of the inner peripheral surfaces is formed with at least one of a concave portion into which the elastic member enters and a convex portion in which the elastic member enters.

In this resin gear, when at least one of a concave portion and a convex portion is formed on the outer peripheral surface of the metal bush, at least one of the concave portion and the convex portion allows oil to enter between the elastic member and the metal bush. The route can be extended. When at least one of the concave portion and the convex portion is formed on the inner peripheral surface of the resin member, at least one of the concave portion and the convex portion can extend the oil infiltration path between the elastic member and the resin member. Therefore, even if the oil infiltration progresses, it becomes difficult for the deterioration of the elastic member to progress until it 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 concave portions and the convex portions formed on the outer peripheral surface of the metal bush may be located at the axial end portion on the outer peripheral surface. .. According to this configuration, as described above, the oil infiltration does not easily proceed to the central portion in the axial direction of the elastic member, and the central portion does not easily deteriorate, so that the damping function can be effectively maintained. ..

In the resin gear according to another aspect of the present invention, even if at least one of the concave portion and the convex portion formed on the inner peripheral surface of the resin member is located at the axial end portion on the inner peripheral surface. good. According to this configuration, as described above, the oil infiltration does not easily proceed to the central portion in the axial direction of the elastic member, and the central portion does not easily deteriorate, so that the damping function can be effectively maintained. ..

According to the present invention, it is possible to provide a resin gear capable of maintaining a damping function even under oil lubrication.

FIG. 1 is a front view of the resin gear according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is an enlarged view showing a part of the cross section of FIG. FIG. 4 is an enlarged view showing a part of the cross section corresponding to FIG. 2 in the resin gear according to the modified example of the first embodiment. FIG. 5 is an enlarged view showing 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 showing a part of the cross section corresponding to FIG. 2 in the resin gear according to the modified example 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 equivalent elements are designated by the same reference numerals, and duplicate description is 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 industrial use. For example, the resin gear 1 can be used for a balance shaft gear, a camshaft gear, or the like 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 made of a metal such as stainless steel. The metal bush 3 is provided with a through hole 3h. The through hole 3h penetrates the one end surface 3a and the other end surface 3b of the metal bush 3. A rotation shaft is inserted into the through hole 3h. The metal bush 3 has an inner peripheral surface 4a and an outer peripheral surface 4b. The inner peripheral surface 4a defines a through hole 3h. The outer peripheral surface 4b is a surface facing the elastic member 5.

The elastic member 5 is a member that attenuates the impact generated when the resin gear 1 meshes with another gear. The elastic member 5 absorbs and attenuates 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 so as to be in contact with the outer peripheral surface 4b of the metal bush 3. It should be noted that what is provided around the metal bush 3 is not only provided so as to be in direct contact with the circumference of the metal bush 3, but also provided around the metal bush 3 via another member. include.

The elastic member 5 is provided between the metal bush 3 and the resin member 7. The elastic member 5 is provided so as to be 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 made of rubber. The rubber is butadiene rubber, chloroprene rubber, butyl rubber, styrene butadiene rubber, nitrile rubber, ethylene propylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, silicone rubber and the like. The rubber is preferably fluororubber or silicone rubber from the viewpoint of durability and heat resistance.

The resin member 7 is a member that meshes with other gears. The resin member 7 is annular. The resin member 7 is made of resin. The resin to be used may be either a thermosetting resin or a thermoplastic resin, but a thermosetting resin is preferable from the viewpoint of improving the strength of the manufactured resin gear 1. More specifically, epoxy resin, polyaminoamide resin, phenol resin, unsaturated polyester resin, polyimide resin, polyether sulfone resin, polyether ether ketone resin, polyamideimide 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, the polyaminoamide resin is preferable from the viewpoint of the strength and heat resistance of the cured resin, and the mixture 100 of 2,2'-(1,3 phenylene) bis2-oxazoline and the amine curing agent having excellent heat resistance and strength is 100. With respect to parts by mass, it is preferable to use, for example, a resin having n-octylbromide of 5 parts by mass or less as a curing accelerator for the catalyst.

The resin member 7 is provided around the metal bush 3 and, by extension, around the elastic member 5. The resin member 7 here is provided so as to be in contact with the outer peripheral surface of the elastic member 5. A tooth profile 7x 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. It should be noted that the provision around the elastic member 5 includes not only the provision in direct contact with the circumference of the elastic member 5 but also the provision around the elastic member 5 via another member.

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 the resin. It protrudes to one side of the member 7. The other side of the elastic member 5 in the axial direction protrudes toward the other side of the metal bush 3 and the resin member 7. This protruding portion expands inward in the radial direction and contacts the metal bush 3, and also expands outward in the radial direction and contacts 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 in contact with one end surface 3a of the metal bush 3, and a second contact portion 52a which is an annular portion in contact with one end surface 7a of the resin member 7. It includes a connecting portion 53a that connects 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 in contact with the other end surface 3b of the metal bush 3, and a second contact portion 52b which is an annular portion in contact with the other end surface 7b of the resin member 7. It includes a connecting portion 53b that connects the first contact portion 51b and the second contact portion 52b to each other.

Each of the first contact portions 51a and 51b extends to a partial region (in the illustrated example, a region from the center to the outside in the radial direction) 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 by 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 51a and 51b, the elastic member is in contact with the one end surface 3a and the other end surface 3b of the metal bush 3. The oil infiltration path between the 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 are in contact with the one end surface 7a and the other end surface 7b of the resin member 7, so that the elastic member 5 and the resin member 7 are in contact with each other. The oil infiltration route can be extended.

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

"Oil infiltration" means that oil enters between the 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. "Oil infiltration" includes the infiltration of oil into the interface of the elastic member 5. The "oil infiltration route" is the route of oil infiltration.

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

In the elastic member 105, each of the first contact portions 51a and 51b extends to the entire region 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. This makes it possible to maximize the extension of the oil infiltration path by the first contact portions 51a and 51b. In the elastic member 105, each of the second contact portions 52a and 52b extends over the entire region 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. This makes it possible to maximize the extension of the oil infiltration path by the second contact portions 52a and 52b.

The resin gears 1, 101 include first contact portions 51a and 51b and second contact portions 52a and 52b, but may have at least one of these. The resin gear 101 has a feature that the first contact portion 51a extends over the entire region of the one end surface 3a, a feature that the first contact portion 51b extends over the entire region of the other end surface 3b, and a second contact portion 52a extends over the entire region of the one end surface 7a. The second contact portion 52b has a characteristic of expanding to the entire region of the other end surface 7b, and may have at least one of these characteristics.

[Second Embodiment]
Next, the 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 a contact portion 50a and a contact portion 50b (see FIG. 3) provided on one side and the other side in the axial direction, respectively.

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

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

As described above, in the resin gear 201, the oil infiltration 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 recess 71 formed in the inner peripheral surface 7y of the resin member 7 can extend the oil infiltration path between the elastic member 205 and the resin member 7. Therefore, even if the oil infiltration progresses, it becomes difficult for the deterioration of the elastic member 205 to progress until it 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 the axial end of the outer peripheral surface 4b. According to this configuration, the oil intrusion between the elastic member 205 and the metal bush 3 is less likely to proceed to the central portion in the axial direction of the elastic member 205, and the central portion is less likely to deteriorate. Since the central portion constitutes a main portion that greatly contributes to the damping function, it is possible to effectively maintain the damping function.

In the resin gear 201, the recess 71 formed in the inner peripheral surface 7y of the resin member 7 is located at the axial end of the inner peripheral surface 7y. According to this configuration, the oil intrusion between the elastic member 205 and the resin member 7 is less likely to proceed to the central portion in the axial direction of the elastic member 205, and the central portion is less likely to deteriorate. As described above, the central portion constitutes a main portion that greatly contributes to the damping function, so that the damping function can be effectively maintained.

FIG. 6 is a cross-sectional view of the resin gear 301 according to the modified example of the second embodiment. As shown in FIG. 6, the resin gear 101 may include the elastic member 305 instead 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 350a includes a first contact portion 351a which is an annular portion in contact with one end surface 3a of the metal bush 3, and a second contact portion 352a which is an annular portion in contact with one end surface 7a of the resin member 7. It includes a connecting portion 353a that connects 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 in contact with the other end surface 3b of the metal bush 3, and a second contact portion 352b which is an annular portion in contact with the other end surface 7b of the resin member 7. It includes a connecting portion 353b that connects the first contact portion 351b and the second contact portion 352b to each other. Each of the first contact portions 51a and 51b extends to a partial region 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 each of the one end surface 7a and the other end surface 7b.

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

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

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

In the above embodiment, the embodiment in which the resin gears 1, 101, 201, 301 are spur gears has been described as an example, but the resin gears 1, 101, 201, 301 may be helical gears or the like. .. In the present invention, each configuration of the above-described embodiment and the above-mentioned modification may be appropriately combined. The present invention can be modified in various ways without departing from the gist thereof.

1,101,201,301 ... Resin gears, 3 ... Metal bushes, 3a ... One end surface (end face), 3b ... End face (end face), 4b ... Outer peripheral surface, 5,105,205,305 ... Elastic members, 7 ... resin member, 7a ... one end surface (end surface), 7b ... other end surface (end surface), 7x ... tooth profile, 7y ... inner peripheral surface, 31, 71 ... recess, 51a, 51b, 351a, 351b ... first contact portion, 52a, 52b, 352a, 352b ... Second contact portion.

Claims (7)

An annular metal bush and
An annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an annular resin member.
An elastic member provided between the metal bush and the resin member is provided.
The elastic member has 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.
The elastic member is provided so as to be in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member.
A recess into which the elastic member enters is formed on the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member.
The recess formed on the outer peripheral surface of the metal bush is a groove that extends continuously in an annular shape along the outer peripheral surface, and is at least one of one end and the other end in the axial direction on the outer peripheral surface. Located in
The recess formed on the inner peripheral surface of the resin member is a groove that extends continuously in an annular shape along the inner peripheral surface, and is at least one end portion and the other end portion in the axial direction of the inner peripheral surface. Located in one of the
A resin gear in which the corners of the edges of the groove as the recess formed in the metal bush and the resin member are not rounded . The resin gear according to claim 1, wherein the first contact portion extends from an outer edge to an inner edge on an axial end surface of the metal bush. The resin gear according to claim 1 or 2, wherein the second contact portion extends from the inner edge to the outer edge on the axial end surface of the resin member. An annular metal bush and
An annular resin member provided around the metal bush and having a tooth profile formed on the outer peripheral portion, and an annular resin member.
An elastic member provided between the metal bush and the resin member is provided.
The elastic member is provided so as to be in contact with the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member.
A recess into which the elastic member enters is formed on the outer peripheral surface of the metal bush and the inner peripheral surface of the resin member.
The recess formed on the outer peripheral surface of the metal bush is a groove that extends continuously in an annular shape along the outer peripheral surface, and is at least one of one end and the other end in the axial direction on the outer peripheral surface. Located in
The recess formed on the inner peripheral surface of the resin member is a groove that extends continuously in an annular shape along the inner peripheral surface, and is at least one end portion and the other end portion in the axial direction of the inner peripheral surface. Located in one of the
A resin gear in which the corners of the edges of the groove as the recess formed in the metal bush and the resin member are not rounded . The resin gear according to any one of claims 1 to 4, wherein the recess has a V-shaped cross section. A groove that continuously extends in an annular shape along the outer peripheral surface is not formed in the central portion of the outer peripheral surface of the metal bush in the axial direction.
The invention according to any one of claims 1 to 5, wherein a groove continuously extending in an annular shape along the inner peripheral surface is not formed in the central portion of the inner peripheral surface of the resin member in the axial direction. Resin gears. The elastic member is
In contact with the corner portion formed by the outer peripheral surface and the end surface in the axial direction of the metal bush,
The resin gear according to any one of claims 1 to 6, which is in contact with a corner portion formed by an inner peripheral surface and an end surface in the axial direction of the resin member.

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