JP4873569B2 - Gear device - Google Patents

Description

  The present invention relates to a gear device used for power transmission devices and the like of various automobile parts, industrial machines, precision machines and the like.

  Conventionally, resin gears have been widely used in power transmission devices such as various parts of automobiles and industrial machines. The main reasons include advantages such as being lighter, self-lubricating and quieter in operation than metal gears.

  In a resin gear, when trying to obtain a high reduction ratio, a combination of a worm gear and a worm wheel is generally used like a metal gear. A combination of a face gear and a spur gear (or a helical gear) is used. By the way, although the resin gear has self-lubricating properties as described above, it is said that when the lubricant (for example, grease) is supplied externally, the service life can be further extended.

  However, when the lubricant is supplied to the resin gear, if the lubricant is simply applied to the tooth surface, the lubricant is moved in the same direction so as to be pushed out by the movement of the contact portion of the two tooth surfaces. Therefore, long-term effects cannot be expected. This also applies to metal gears.

In Patent Document 1, a plurality of steps are provided on the tooth face of a metal face gear, and a lubricant is held therein. As a result, the retention of the lubricant is increased, and the lubricant can be supplied over a long period of time.
JP 2002-233276 A

  However, according to the above-mentioned Patent Document 1, although the retaining force of the lubricant is improved by providing a step on the tooth surface of the face gear, the tooth surface of the counterpart gear is rubbed against the tooth surface on which the step is formed. For this reason, there is a problem that noise increases, wear of the tooth surface is promoted, and the service life is reduced. That is, the configuration itself for increasing the retention force of the lubricant, which can reduce the noise and suppress the wear and achieve a long life, generally increases the noise and promotes the wear of the tooth surface. It is the composition which lowers. As described above, Patent Document 1 is an invention related to a metal gear, but the problem of Patent Document 1 regarding a metal gear is a problem that also applies to a resin gear.

  Therefore, the present invention can achieve a long-term reduction in noise and suppression of wear caused by the lubricant by increasing the retention of the lubricant while having a configuration that does not cause an increase in noise or increase in wear. An object of the present invention is to provide a gear device.

The invention according to claim 1 relates to a gear device comprising a face gear and a mating gear meshing with the face gear . In this invention,
(1). The face gear includes a web, a back surface portion formed radially outside the web, a tooth tip surface, one tooth surface, and the other tooth surface, and a circumferential direction on one side surface of the back surface portion. A plurality of teeth formed along a radial outer side of the radially outer end face of the teeth, and
One virtual extension surface formed by extending one tooth surface of the tooth radially outward, and the other tooth
Is arranged in a region between the other virtual extension surface formed by extending one tooth surface radially outward
And a lubricant holding part .
(2). The lubricant holding part is a protruding part formed integrally with the back part,
At least the one virtual extension surface and the other virtual extension surface and the protruding portion
And a space for storing the lubricant.
(3). The mating gear has when engaged with the face gear, the one of both side surfaces in the axial direction of the mating gear, the outward radial direction side edge surface side of the side surface of the teeth of the face gear, the diameter at the tooth surface of the face gear look like located radially outward than the outward side edge
The

The invention according to claim 2 is a protruding shape of the lubricant retaining portion in the gear device according to claim 1.
It has characteristics in the part. That is, in the present invention , the protruding shape of the lubricant holding portion
The shape-shaped portion includes a lubricant retaining portion tip surface formed at the same height as a toothpick of the tooth tip surface of the tooth, one surface disposed to face the one virtual extension surface, and the other And the other surface disposed to face the virtual extension surface . And the thickness in the tooth thickness direction of the said lubricant holding part tooth tip surface is formed thinner than the thickness in the tooth thickness direction of the said tooth tip surface in the said radial direction outer side end surface of the said tooth | gear . The one surface and the other surface are the one virtual extension surface.
And formed at a position separated from the other virtual extension surface by a predetermined distance toward the inside in the tooth thickness direction.
The

The invention according to claim 3 is the protruding shape of the lubricant retaining portion in the gear device according to claim 1.
It has characteristics in the part. That is, in the present invention , the protruding shape of the lubricant holding portion
Jo portion thereof radially inward end surface is connected to the outward radial direction side edge surface of the tooth, lubricant height in the tooth depth direction than <br/> tooth crest of the teeth are formed lower Holding part tooth tip surface and said one
One surface arranged opposite the virtual extension surface and the other virtual extension surface arranged
And the other surface. And the thickness in the tooth thickness direction of the lubricant holding part tooth tip surface is
, Thinner than the thickness in the tooth thickness direction of the tooth tip surface at the radially outer end surface of the tooth
Is formed. Further, the one surface and the other surface is formed at a position separated by a predetermined distance in the tooth thickness direction in the side from the one of the virtual extension surface and the other of the virtual extension surface.

According to a fourth aspect of the present invention, there is provided a projection of the lubricant retaining portion in the gear device according to the first or second aspect.
It has a feature in the protruding shape portion. That is, in the present invention, the lubricant holding portion
Projecting shape portion that is formed so as to cross-sectional area of the cross section increases in the tooth depth direction as radially outward side.

The invention according to claim 5 is the lubricant in the gear device according to any one of claims 2 to 4.
The protruding portion of the holding portion is characterized. That is, in the present invention , the radially outer end surface of the protruding portion of the lubricant retaining portion is formed to have a greater thickness in the tooth thickness direction than the radially outer end surface of the protruding portion. A lubricant stop is formed
Yes.

The invention according to claim 6 is the protruding shape of the lubricant retaining portion in the gear device according to claim 1.
It has characteristics in the part. That is, in the present invention , the protruding shape of the lubricant holding portion
Radially inward end surface of Jo portion, Ru formed wall portion der to face the outward radial direction side edge surface of the tooth.

  The invention according to claim 7 is the gear device according to any one of claims 1 to 6, wherein the lubricant is formed on the radially inner end surface of the tooth in a ring shape that is higher than the tooth depth of the tooth. It features a spill prevention wall.

The invention according to claim 8 relates to a gear device comprising a face gear and a mating gear meshing with the face gear . In this invention,
(1). The face gear includes a web, a back surface portion formed radially outside the web, a tooth tip surface, one tooth surface, and the other tooth surface, and a circumferential direction on one side surface of the back surface portion. A plurality of teeth formed along the radial direction inner side end surface of the teeth in the radial direction, and
One virtual extension surface formed by extending one tooth surface of the tooth radially inward; and the other tooth
It is arranged in the area between the other virtual extension surface formed by extending one tooth surface radially inward
And a lubricant holding part.
(2). The lubricant holding part has a protruding shape part formed integrally with the back part, and at least
Both are formed between the one virtual extension surface and the other virtual extension surface and the protruding portion.
And a space for storing the lubricant.
(3). When the mating gear meshes with the face gear, the side surface of the face gear on the radially inner end surface side of the both sides in the axial direction of the mating gear has a diameter on the tooth surface of the face gear. look like located radially inwardly than the inwardly side edges
The

Invention, the protruding shape of the lubricant holding portion definitive the gear device according to claim 8 according to claim 9
It has characteristics in the part. That is, in the present invention , the protruding shape of the lubricant holding portion
The shaped portion includes a lubricant retaining portion tooth tip surface formed at a position on the tooth tip side of the tooth, one surface disposed to face the one virtual extension surface, and the other virtual extension surface. And the other surface disposed opposite to the surface . And the radial direction outer side end surface of the said protrusion-shaped part is connected to the said radial direction inner side end surface of the said tooth | gear . In addition, the lubricant holding portion tooth tip surface is formed to have a lower height in the toothpaste direction than the tooth tip surface . Further, the one surface and the other surface is formed at a position separated by a predetermined distance in the tooth thickness direction in the side from the one of the virtual extension surface and the other of the virtual extension surface.

The invention according to claim 10 is the gear device according to claim 8, wherein the lubricant holding portion protrudes.
A radially outer end surface of the shape portion is a wall surface portion formed so as to face the radially inner end surface of the tooth.

The invention according to claim 11 is the gear device according to any one of claims 1 to 10,
The face gear and the mating gear are formed by injection molding.

According to the first aspect of the present invention, the configuration is such that the counter gear is the drive gear and the face gear is the driven gear, and the contact portion of the tooth surfaces of both gears is the radial direction from the radially outer edge. Move towards the inner edge. In addition, the protruding portion of the lubricant retaining portion is formed integrally with the back surface portion, is radially outward from the radially outer end surface of the tooth, and is located between one and the other virtual extension surface. When the mating gear meshes with the face gear, the side surface on the radially outer end surface side of the tooth of the face gear is the diameter of the tooth surface of the face gear when both sides in the axial direction are engaged. When the lubricant is held by the space of the lubricant holding portion , the outer side edge of the direction is positioned on the outer side (the portion located on the outer side is appropriately referred to as the “extrusion portion”). The lubricant comes into contact with the protruding portion. The lubricant that has come into contact with the protruding portion moves at least part of the protruding portion from the radially outer side to the radially inner side beyond the radially outer edge of the tooth surface of the face gear. Accordingly, it is supplied between both tooth surfaces, and further moves from the radially outer edge toward the radially inner edge with the movement of the contact portion of the tooth surfaces of both gears. That is, on the upstream side (radially outward edge side) along the moving direction of the lubricant,
A lubricant holding portion is formed as a lubricant supply source, and the lubricant is supplied between the tooth surfaces sequentially from the supply source via the protruding portion. Can be maintained. That is, while maintaining a configuration that does not cause an increase in noise or increase in wear, it is possible to increase the retention of the lubricant and to realize a reduction in noise and suppression of wear over a long period of time. Further, the lubricant retaining portion is disposed in a region between the one and the other virtual extension surfaces, and there is no possibility that the protruding shape portion unnecessarily contacts the mating tooth surface of the mating gear. Note that the protruding portion includes not only a case where the value is positive but also a case where the value is zero.
In this case, the lubricant stored in the space of the lubricant holding portion seems to be pulled as the lubricant in the gap between both tooth surfaces moves from the radially outer side to the radially inner side. Thus, it is supplied between both tooth surfaces.

According to the invention of claim 2, the protruding portion of the lubricant holding portion has the lubricant holding tooth tip surface formed at the same height as the toothpaste of the tooth tip surface, and one surface and one side Between the virtual extension plane (space
) And between the other surface and the other virtual extension surface (space) .
For this reason, it is possible to efficiently supply a small amount of lubricant between the face gear and the counter gear without waste over a long period of time.

According to the invention of claim 3, the protruding portion of the lubricant holding portion is formed so as to protrude a part of the radially outer end face of the tooth toward the radially outer side. The surface is formed at a position spaced apart from the one and the other virtual extension surface by a predetermined distance, and the lubricant holding portion tooth tip surface is formed to have a height lower in the toothpaste direction than the tooth tip surface. The surface, the other surface, and the lubricant retaining tooth tip surface are formed in a step shape with respect to the radially outer end surface of the tooth. That is, when viewed from the radially outer side, the protruding portion of the lubricant retaining portion is formed smaller than the inner end of the radially outer end surface of the tooth. The lubricant can be held in the space of the lubricant holding portion . For this reason, it is possible to efficiently supply a small amount of lubricant between the face gear and the counter gear without waste over a long period of time.

According to the fourth aspect of the present invention, the protruding portion of the lubricant retaining portion is formed such that the cross-sectional area in the toothpaste direction increases toward the radially outer side. That is, at least one of the one surface, the lubricant holding tooth tip surface, and the other surface is formed so as to spread outward, so that the lubricant held by the lubricant holding portion is rotated by the rotation of the face gear. Even when a centrifugal force is applied, it is possible to generate a force that opposes the centrifugal force and to prevent the lubricant from moving radially outward.

  According to the fifth aspect of the present invention, the movement of the lubricant in the radially outward direction can be more reliably prevented by stopping the lubricant.

According to the invention of claim 6 can be retained between (space) between the radially inward end surface of the wall portion of the outward radial direction side edge surface of the teeth and the lubricant holding portion, a lubricant.

  According to the invention of claim 7, the lubricant that has moved from the radially outer edge to the radially inner edge moves further radially inward by the lubricant outflow prevention wall. Can be prevented.

According to the invention of claim 8, the configuration is such that the face gear is the drive gear and the counter gear is the driven gear, and the contact portion of the tooth surface of both gears is the radial direction from the radially inner edge. Move towards the outer edge. The protruding portion of the lubricant retaining portion is formed integrally with the back surface portion, is radially inward of the radially inner end surface of the tooth, and is between the one and the other virtual extension surface. When the mating gear meshes with the face gear, the radially inward edge is positioned on the inward side of the radially inward edge of the tooth surface of the face gear (this inward Since the portion located on the side is referred to as an “extruding portion” as appropriate), when the lubricant is held by the space of the lubricant holding portion, the lubricant comes into contact with the protruding portion. The lubricant that has come into contact with the protruding portion moves at least part of the protruding portion from the radially inner side to the radially outer side beyond the radially inner edge of the tooth surface of the face gear. Accordingly, it is supplied between both tooth surfaces, and further moves from the radially inward edge toward the radially outward edge as the contact portions of the tooth surfaces of both gears move. In other words, a lubricant holding portion serving as a lubricant supply source is formed on the upstream side (radially inward edge side) along the lubricant movement direction, and the lubricant protrudes sequentially from the supply source. Since it is supplied between both tooth surfaces via a part, it becomes possible to maintain the lubrication between both tooth surfaces over a long period of time. That is, while maintaining a configuration that does not cause an increase in noise or increase in wear, it is possible to increase the retention of the lubricant and to realize a reduction in noise and suppression of wear over a long period of time. Further, the lubricant retaining portion is disposed in a region between the one and the other virtual extension surfaces, and there is no possibility that the protruding shape portion unnecessarily contacts the mating tooth surface of the mating gear. Note that the protruding portion includes not only a case where the value is positive but also a case where the value is zero. In this case, the lubricant stored in the space of the lubricant holding portion is pulled as the lubricant in the gap between both tooth surfaces moves from the radially inward side to the radially outward side. Thus, it is supplied between both tooth surfaces.

According to the ninth aspect of the present invention, the protruding portion of the lubricant retaining portion is formed so as to project a part of the radially inner end face of the tooth toward the radially inward side, and The surface is formed at a position spaced apart from the one and the other virtual extension surface by a predetermined distance, and the lubricant holding portion tooth tip surface is formed to have a height lower in the toothpaste direction than the tooth tip surface. The surface, the other surface, and the lubricant holding tooth tip surface are formed in a step shape with respect to the radially inner end surface of the tooth. In other words, when viewed from the radially inner side, the protruding portion of the lubricant retaining portion is formed smaller than the inner radial end surface of the tooth. The lubricant can be held in the space of the lubricant holding portion . For this reason, it is possible to efficiently supply a small amount of lubricant between the face gear and the counter gear without waste over a long period of time.

  According to the invention of claim 10, the lubricant that has moved from the radially inner edge to the radially outer edge moves further radially outward by the lubricant outflow prevention wall. Can be prevented.

  According to the eleventh aspect of the present invention, the face gear having the effects according to the first to tenth aspects can be easily formed by injection molding.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
With reference to FIGS. 1-7, the gear apparatus 1 which concerns on this invention is demonstrated. Of these, Figure 1 (
a) is a front view of the face gear 10, and FIG. 1 (b) is a tooth 12 of the face gear 10 of FIG. 1 (a).
FIG. 1C is a cross-sectional view of the face gear 10 cut along the line AA in FIG. 1A. FIG. 2 is an enlarged view of the vicinity of the tooth 12 indicated by a two-dot chain line P in FIG. However, in the figure, a spur gear (counter gear) 26 that meshes with the face gear 10.
The motor 27 is also shown. That is, the meshing part of the gear device 1 is shown . FIG.
FIG. 3A is an enlarged perspective view of the teeth 12 taken out from the face gear 10 and shown in FIG.
b) is a view of the teeth 12 as seen from the front side (upper side in FIG. 3A). However, in the same figure, the state which removed the lubricant holding | maintenance part 13 (refer FIG. 4) is illustrated. FIG. 4A is a perspective view for explaining the lubricant holding portion 13, and FIG. 4B is a front view of the lubricant holding portion 13 (FIG. 4A).
It is the figure seen from the upper direction in). FIG. 5A is a perspective view for explaining the lubricant holding portion 30 (first modification), and FIG. 5B is a view showing the lubricant holding portion 30 from the front side (upper side in FIG. 5A). FIG. FIG. 6A is a perspective view for explaining the lubricant holding portion 32 (second modification), and FIG. 6B shows the lubricant holding portion 32 from the front side (above in FIG. 6A). FIG. FIG. 7A is a perspective view for explaining the lubricant holding portion 33 (third modification), and FIG. 7B shows the lubricant holding portion 33 from the front side (above in FIG. 7A). FIG.

  As shown in FIG. 2, the gear device 1 includes a face gear 10 and a mating gear 26 that meshes with the face gear 10.

  As shown in FIG. 1, the face gear 10 is formed by, for example, injection molding a resin material. Resin materials such as thermoplastic materials such as polyacetal, polyamide, polyphenylene sulfide, and polybutylene terephthalate can be used.

  As shown in FIG. 1, the face gear 10 includes a web 11, a back surface portion 17 formed on the outer side in the radial direction of the web 11, and a plurality of teeth formed along the circumferential direction on one side surface of the back surface portion 17. 12 and a lubricant retaining portion 13 formed on the radially outer side of the teeth 12.

  Of these, the web 11 is formed in a substantially disk shape, and a boss 14 concentric with the web 11 is disposed at the center. The boss 14 is formed in a cylindrical shape, and a shaft hole 16 into which the shaft 15 is fitted via a detent (not shown) is formed at the center.

  The teeth 12 are formed on the radially outer end side on one side surface of the web 11, that is, on one side surface (front side) of the back surface portion 17 formed radially outward of the web 11. Each tooth 12 is formed on the radially outer end side so as to extend from the radially inner side to the radially outer side, and a plurality of teeth 12 are formed at a predetermined pitch along the circumferential direction of the web 11. Yes. As shown in FIG. 3, each tooth 12 includes a tooth tip surface 20 and two tooth surfaces 21 (one tooth surface 21 and the other tooth extending obliquely downward from both edges in the circumferential direction of the tooth tip surface 20. Surface 21), a tooth bottom surface 22 continuous with the lower edge of these tooth surfaces 21, a radially outer end surface 23, and a radially inner end surface 24. The radially inner end face 24 is covered with a lubricant stopper (lubricant outflow prevention wall) 25 described later. Here, assuming that the radially outer edge of one tooth surface 21 and the other tooth surface 21 is a radially outer edge 21a and the inner edge is a radially inner edge 21b, A virtual surface obtained by extending the tooth surface 21 to the outside of the radial outer side edge 21a and the inner side of the radial inner side edge 21b is a virtual extended surface H (one virtual extended surface H and the other virtual extended surface H). Let it be a virtual extension plane H).

Here, in the following description, the above-mentioned “radial outer side end face 23” and “radial outer side end edge 21a” are intentionally distinguished and used. The “radially outward end surface 23” refers to a surface located outside rather than inside of two end surfaces intersecting (substantially orthogonal to) the tooth tip surface 20 and the two tooth surfaces 21 of the tooth 12. . On the other hand, “radially outward edge 2
“1a” refers to an edge located on the outer side, not on the inner side, of the two end edges at different positions in the radial direction on the tooth surface 21. The “radially outer end edge 21a” is also an intersection line between the “radially outer end face 23” and the “tooth surface 21”. Therefore, in the description of the supply (movement) of the lubricant, the “radially outer end edge 21a” is exclusively used. As will be described later, the lubricant stored in the lubricant holder 13 (see FIG. 4) moves from the radially outer side to the radially inner side beyond the “radially outer end edge 21a”, This is because it is supplied between the tooth surface 29a on the face gear 10 side and the tooth surface 29a on the spur gear 26 side.

  In the present embodiment, the tooth 12 of the face gear 10 has a generating tooth shape, and the counter gear that meshes with the tooth 12 is a spur gear 26 as shown in FIG. The teeth 12 of the face gear 10 and the teeth 29 of the spur gear 26 are meshed so that the tooth surface 21 of the tooth 12 and the tooth surface (counter tooth surface) 29a of the tooth 29 come into contact (contact). It has become. These tooth surfaces 21 and 29a are both formed in an involute tooth profile. In the present embodiment, the above-described spur gear 26 is fixed to the output shaft 28 of the motor 27 and serves as a driving gear, and thus the face gear 10 serves as a driven gear. That is, the driving force of the motor 27 is transmitted to the spur gear 26 via the output shaft 28, and is transmitted to the tooth surface 21 on the face gear 10 side via the tooth surface 29a on the spur gear 26 side. The face gear 10 is rotated (driven rotation). The spur gear 26 is formed of the same material as the face gear 10.

Here, in this embodiment, as shown in FIG. 2, the face gear 10 and the spur gear 26 have their respective teeth 12, 12 so that the protruding portion D is formed on the tooth surface 29 a of the tooth 29 of the spur gear 26. 2
6 is meshed. The protruding portion D may protrude outwardly in the radial direction from the radially outer side edge 21a of the tooth surface 21 when contacting the tooth surface 21 of the face gear 10 out of the tooth surface 29a of the spur gear 26. Refers to the part. For example, when the face gear 10 is rotated in one direction by the rotation of the spur gear 26, the contact between both the tooth surfaces 29 a and 12 is
Assuming that the measurement is performed in the range of 0 to θ degrees (θ> 0) along the rotation direction of the face gear 10, the radial width D1 of the protruding portion D defined above is theoretically Is almost the maximum when the rotation angle of the face gear 10 is 0 degree, and decreases as it approaches θ / 2 degrees. When it exceeds θ / 2 degrees, it increases as it moves away from θ / 2 degrees, and at θ degrees Almost at maximum. Considering this point, the “protruding portion D” that is a “protruding portion” is
It is considered that the protruding portion D is when the width D1 is maximum. It should be noted that it is sufficient that the protruding portion D is secured when the width D1 is maximized, and the protruding portion D may be removed as the face gear 10 rotates. As described above, if the protruding portion D is secured, at least when the width D1 of the protruding portion D is maximized, the protruding portion D is stored in the lubricant holding portion 13 (see FIG. 4) as described later. As the face gear 10 rotates, the protruding portion D exceeds the radially outer edge 21a of the tooth surface 21 of the face gear 10 and moves from the radially outer side to the inner side. When moving relatively, the lubricant is supplied between the tooth surfaces 29a and 21. In the first embodiment, the lubricant is supplied from the lubricant holding unit 13 mainly in the face gear 1 in the example in which the face gear 10 rotates by 0 to θ degrees.
Place in 0~θ / 2 times the range of the rotation angle of 0, in the range of theta / 2 through? Degree, it is hardly performed.

  In addition, in this invention, the case where the width | variety of the protrusion part D is 0 shall be included. That is, when the width D1 becomes 0 at the rotation angle of the face gear 10 (0 degrees (or θ degrees in the above example)) at which the width D1 of the protruding portion D is maximum, more specifically, the face gear 10 When the rotation angle is 0 degree, the radially outer edge 21a of the tooth surface 21 of the face gear 10 and the edge 29b of the tooth surface 29a of the spur gear 26 closer to the motor 27 in FIG. If they match, the lubricant does not come into contact with the protruding portion D because there is no protruding portion D. However, the lubricant comes into contact with the contact portion between the radially outer end edge 21a of the tooth surface 21 of the face gear 10 and the end edge 29b of the tooth surface 29a on the spur gear 26 side, which coincide with each other. For this reason, the lubricant in contact with the contact portion has both tooth surfaces 21 as the lubricant between both tooth surfaces 21 and 29a is moved from the radially outer edge to the radially inward side. , 29a to be supplied.

  To summarize the above description of the protruding portion D, it is sufficient that the protruding portion D is secured even when the radial width D1 is maximized. Further, the protrusion D may have a width D1 of 0 at the rotation angle of the face gear 10 when the radial width D1 is maximized. However, from the viewpoint of better lubrication, it is preferable that the width D1> 0.

  In the second embodiment to be described later, the rotational angle of the face gear 10 and the magnitude relationship between the radial width D1 of the protruding portion D are opposite to those in the first embodiment. That is, the width D1 of the protruding portion D is substantially minimum when the rotation angle of the face gear 10 is 0 degree, increases as it approaches θ / 2 degrees, becomes substantially maximum at θ / 2 degrees, and θ / 2 degrees. The distance increases as the distance from the center increases, and is substantially the maximum at θ degrees. Further, the supply of the lubricant from the lubricant holding unit 13 is also performed mainly between θ / 2 to θ degrees of the rotation angle of the face gear 10.

In the present embodiment, as shown in FIG. 4, the lubricant holding portions 13 are provided on the radially outer end surfaces 23 of the respective teeth 12. The lubricant holding portion 13 is configured integrally with the back surface portion 17 shown in FIGS. 1C, 2, and 4, and is disposed on the radially outer side than the radially outer end surface 23 of the tooth 12. Has been. The lubricant holding part 13 shown in FIG. 4 has a portion (protruding shape portion) 19a having a shape such that a part of the radially outer end face 23 of the tooth 12 protrudes radially outward. Yes .
In other words, the lubricant holding section 13 is a region between one of the virtual extended surface H and the other of the virtual extended surface H, is disposed in a region including the one virtual plane H and the other imaginary plane H Yes. In other words, the lubricant retaining portion 13 has two storage surfaces 13b (one surface 13b and the other surface) formed so that the tooth thickness is thinner than the one virtual extension surface H and the other virtual extension surface H. 13b)
This storage surface 13b and the storage surface 13 on the radially outer end surface 23 of the tooth 12 are provided.
A space 19b is formed by a portion located on the outer side in the tooth thickness direction than b. The two storage surfaces 13b described above are arranged so as to face one virtual extension surface H and the other virtual extension surface H, respectively.

Hereinafter, the lubricant holding unit 13 will be described in detail. The protruding portion 19a of the lubricant retaining portion 13 is a region between the two virtual extension surfaces H, that is, a center plane C passing through the center of the tooth thickness in the tooth thickness direction (arrow W direction) of the entire tooth 12 (however, FIG. In this case, a part of the radially outer end face 23 of the tooth 12 is formed so as to project in a region on the side of the single dotted line. Lubricant holding part 13
The protrusion-shaped portion 19 a has a side surface 13 a, two storage surfaces (inclined surfaces) 13 b, and a top surface (lubricant holding portion tooth tip surface) 13 c, and the radially outer end surface 23 of the tooth 12. And the storage surface 13b
A space 19b along the tooth surface 21 and the tooth tip surface 20 is formed between the tooth surface 21 and the top surface 13c. That is, the storage surface 13b of the protruding portion 19a in the lubricant retaining portion 13 is arranged at a position where the tooth thickness decreases toward the center side in the tooth thickness direction of the virtual extension surface H, and the top surface 13
c is arranged at a position where tooth depth becomes low with respect to a surface (not shown) obtained by extending the tooth tip surface 20 radially outward. In other words, the protruding portion 19 a of the lubricant retaining portion 13 has a radially inner end face connected to the radially outer end face 23 of the tooth 12 . Further , the top surface 13 c of the protruding portion 19 a in the lubricant holding portion 13 is formed to have a height in the toothpaste direction lower than the tooth tip surface 20 of the tooth 12 . Further, the protruding shape portion in the lubricant holding portion 13
One storage surface 13b and the other storage surface 13b of 19a are separated from the one virtual extension surface H and the other virtual extension surface H by a predetermined distance (in the present embodiment, a certain distance) in the tooth thickness direction. It is arranged at the position. The space 19b described above is configured to store the lubricant, and the
The protruding portion 19a and the space 19b constitute the lubricant holding portion 13 . Na us, the lower end of the two storage surface 13b would intersect the same plane as root surface 22.

When the tooth surface 29a on the spur gear 26 side contacts the tooth surface 21 on the face gear 10 side, the lubricant stored in the lubrication unit holding unit 13 contacts the protruding portion D of the tooth surface 29a. And
The lubricant adhering to the protruding portion D has a contact portion between the tooth surface 29a on the spur gear 26 side and the tooth surface 21 on the face gear 10 side, from the radially outer edge 21a to the radially inner edge 21b. As it moves toward, it moves in the same direction. Thus, the lubricant holding part 13 as a supply source
Since the lubricant stored in is supplied between the tooth surfaces 29a and 21 via the protruding portion D, the space between the tooth surfaces 29a and 21 can be lubricated over a long period of time. In the present embodiment, the lubricant outflow prevention wall 25 is formed so as to cover the radially inner end face 24 of the tooth 12. The lubricant outflow prevention wall 25 is erected in a wall shape on one side surface of the web 11, and is formed in an annular shape over the entire circumference of the web 11. The lubricant outflow prevention wall 25 is higher than the tooth depth of the tooth 12 and is formed in an annular shape with reference to the center of the boss 14 shown in FIG. The lubricant outflow prevention wall 25 is stored in the above-described lubricant holding portion 13 and is moved radially outward from the radially outer side edge 21a as the contact portions of both the tooth surfaces 29a and 21 are moved. This is to prevent the lubricant that has moved toward the side edge 21 b from flowing unnecessarily inside the web 11 rather than the teeth 12. In the example shown in FIG. 4, collision of the lubricant holding section 13
The top surface 13c of the protruding portion 19a is formed lower than the tooth tip surface 20, and this portion (space
Although the lubricant is in configuration as that accumulated to 19b a portion of), this part can be omitted. That is, the top surface 13 c of the protruding portion 19 a may be formed on the same plane as the tooth tip surface 20.

  According to the face gear 10 described above, the lubricant holding portion 13 serving as a supply source of the lubricant is arranged at a place other than the tooth surface 21 unlike the prior art, so that the contact between both tooth surfaces 29a and 21 ( There is no possibility of adversely affecting the meshing of the teeth 21 and 29. That is, there is no possibility that wear is promoted or noise increases. Further, even when the lubricant holding part 13 is arranged at a place other than the tooth surface 21, since the protruding part D is positively provided, the lubricant is sequentially passed through the protruding part D. It becomes possible to supply between both tooth surfaces 29a, 21. Furthermore, since the lubricant holding portion 13 is provided on the inner side (including the same surface as the virtual extension surface H) of the virtual extension surface H of the two tooth surfaces 21, 21, the lubricant holding portion 13 There is no possibility that the teeth 29 of the spur gear 26 interfere. In the above description, the storage surface 13b has been described as an example in which the cross-sectional shape in the tooth direction is the same as the cross-sectional shape in the tooth direction of the virtual extension surface H, but the storage surface 13b is limited to this. For example, the storage surface 13b that is gently curved may be formed with a plane that is approximated so as to be uneven.

  In the example shown in FIG. 4 in the present embodiment, the top surface 13c of the lubricant retaining portion 13 is formed so that the height in the toothpaste direction is lower than the tooth tip surface 20 of the tooth 12. The top surface 13c may be formed to have the same height as the tooth tip surface 13. In this case, the thickness of the top surface 13 in the tooth thickness direction (arrow W direction) is thinner than the thickness of the tooth tip surface 20 on the radially outer end surface of the tooth 21 in the tooth thickness direction.

With reference to FIG. 5, the lubricant holding | maintenance part 30 as a 1st modification is demonstrated. As shown in the figure, the protruding shape portion 39a of the lubricant holding section 30 is a portion of the outward radial direction side edge surface 23 of the teeth 12 are formed so as tooth depth direction section is substantially trapezoidal. And in the lubricant holding part 30
Definitive projected shape portion 39a is to increase the cross-sectional area of the tooth depth direction sectional etc. ho go radially outward, it is formed so as to project radially outward. Projection of the lubricant holding section 30
The shape portion 39a has an end surface 30a, a storage surface 30b, and a top surface 30c, and is formed so as to be disposed inside the virtual extension surface H of the two tooth surfaces 21 and 21. The first modification is different from the lubricant holder 13 shown in FIG. 4 described above in that the storage surface 30b
Is formed in a tapered shape. The storage surface 30b is formed so as to expand in the tooth thickness direction (arrow W direction) toward the radially outer side. That is, the storage surface 30b is formed such that the portion located on the radially outer side is further away from the center surface C of the tooth 12. In the first modification, a space 39b is formed by the radially outer end surface 23 and the storage surface 30b, and here (the space 39
The lubricant is stored in b) . Also in the lubricant holder 30 of the first modification,
Similar to the lubricant holding part 13 described above, the protruding part D of the counter spur gear 26 is connected to the lubricant holding part 3.
Since it contacts the lubricant stored at 0 , the lubricant can be sequentially supplied to the contact portion between the tooth surface 21 of the face gear 10 and the tooth surface 29a of the spur gear 26 via the protruding portion D. . Further, in the lubricant holding part 30 of the first modified example, since the storage surface 30b is formed in a radially outward tapered shape as described above, the face gear 10 rotates and lubricates. Even when a centrifugal force acts on the lubricant stored in the agent holding part 30, the lubricant can be made difficult to move radially outward by the storage surface 30b.
As compared with the above, it is possible to create a state in which the lubricant is likely to come into contact with the protruding portion D over a long period of time. Moreover, although the height of the tooth-pitch direction of the top surface 30c in the first modification example is lower than the tooth tip surface 20, it may be formed on the same plane as the tooth tip surface 20.

With reference to FIG. 6, the lubricant holding | maintenance part 32 as a 2nd modification is demonstrated. FIG lubricant holding section 32 shown in (Fig. 6), the protruding shape portion 19a and the impact of the same shape of the lubricant holding section 13 shown in FIG. 4
A lubricant stopper 31 is provided in a rim shape on the peripheral edge of the end face (radially outward end face) 13a of the protruding portion 19a . Lubricants stop 31, the thickness of the tooth thickness direction (arrow W direction), is formed thicker than the thickness of the tooth thickness direction of put that end surface 13a in the projecting shape portion 19a of the lubricant holding section 32. In other words, the projecting shape portion 19a which projects a portion of the outward radial direction side edge surface 23 of the teeth 12 substantially trapezoidal, the end face 13a side of that, the tooth depth direction and the tooth thickness than the projection-shaped portion 19a direction substantially trapezoidal large size sheet member 34 it as being formed integrally
And Tsu. Here, the height from the tooth bottom surface 22 to the tooth tip surface 20 is L1, the protruding shape portion 1
When the height to the top surface 13c of 9a is L2, and the height to the top portion 34c of the thin plate member 34 is L3, these heights L1, L2, and L3 are:
L1 ≧ L3 > L2
Is set to hold the relationship.

In the second modification, the radial outer side end surface 23 of the tooth 12 and the storage surface 1 of the protruding portion 19a.
A space 19b is formed between 3b and the lubricant stopper 31, and the lubricant is stored here (space 19b) . According to the lubricant retaining portion 32 of the second modification , the top surface 1 of the protruding portion 19a.
Since the thin plate member 34 is formed larger in both the toothing direction and the tooth width direction with respect to 3c and the storage surface 13b , that is, the lubricant stopper 31 is higher in the toothing direction than the protruding portion 19a . is formed so as to protrude Ho及 beauty tooth thickness outwardly, when the face gear 10 rotates, centrifugal force acts on the lubricant stored in the space 19b of the lubricant holding section 32, the diameter lubricants stop 31 the lubricant to be moved in the outward direction is reliably prevented, can be held with certainty or lubricants in the space 19b of the lubricant holding section 32. In addition, also in the lubricant holding part 32 according to the second modified example , the entirety thereof is disposed on the inner side (including the same surface as the virtual extension surface H) of the virtual extension surfaces H of the two tooth surfaces 21 and 21. Thus, the protruding portion 19a does not unnecessarily interfere with the counterpart spur gear 26. Incidentally, Oite to the second modification, the protruding shape
Portion 19a is the end surface 13a side in a trapezoidal shape of the thin plate member 34 of its shows an example formed by integrally formed, not limited to this, radially thin plate member 34 from the other portion of the projecting shape portion 19a Spaced apart
You may form so that it may do.

With reference to FIG. 7, the lubricant holding part 33 as a third modification will be described. As shown in FIG. (FIG. 7), protruding shape portion 49a of the lubricant holding section 33 is formed by a thin plate-like member of substantially trapezoidal shape formed integrally with the rear portion 17, the diameter Direction inner side end face (wall surface
) Is arranged so as to face the radially outer end face 23 of the tooth 12. In other words,
Projecting shape portion 49a of the lubricant holding section 33, collision of the lubricant holding section 32 shown in FIG. 6
It can be said that only the thin plate member 34 of the shaped portion 19a out in which are formed. The protruding portion 49a of the substantially trapezoidal lubricant holding portion 33 has two side portions 33b and 33b arranged inside the virtual extension surface H of the two tooth surfaces 21, and a top portion 33c of a tooth tip surface. It is arranged lower than 20. In the lubricant holding portion 33, the radially outer end face 23 of the tooth 12.
And the protruding portion 49a is a space 49b , and a surface corresponding to the tooth bottom surface 22 of the tooth 12 is a storage surface 33a. Also in the third modified example, the lubricant holding portion 33.
Is formed on the inside of the virtual extension surface H of the two tooth surfaces 21 and 21 (including the same plane as the virtual extension surface H), and the lubricant stored in the space 49b protrudes as described above. Via part D
Supplied between both tooth surfaces 29a, 21.

  In the above description, the lubricant holding portions 13, 30, 32, and 33 are all described with respect to the tooth 12 so as to correspond to both the tooth surfaces 21 and 21, but the present invention is not limited thereto. For example, the lubricant retaining portions 13, 30, and 32 may be formed so as to correspond to one tooth surface 21. In this case, it is formed so as to correspond to the tooth surface 21 on the side where the driving force is transmitted from the spur gear 26 as the driving gear. However, from the viewpoint of reducing noise and the like due to backlash, it is preferable to form the lubricant holding portions 13, 30, and 32 corresponding to both tooth surfaces 21.

<Embodiment 2>
In the first embodiment described above, the case where the spur gear 26 is a driving gear and the face gear 10 is a driven gear has been described as an example. However, the present invention is the opposite case, that is, the face gear 10 is a driving gear and the spur gear is a flat gear. The same applies to the case where the gear 26 is a driven gear. Here, the drive gear is not limited to a case where the gear is directly attached to a drive source such as a motor, and means a gear arranged upstream of the driven gear along the power transmission direction. It is used in.

  When the face gear 10 is a drive gear, the contact portion between the tooth surface 21 on the face gear 10 side and the tooth surface 29a on the spur gear 26 side is changed from the radially inner side to the diameter as the face gear 10 rotates. Move outward in the direction. Therefore, the lubricant between the tooth surfaces 21 and 29a also moves in the same direction.

  Therefore, when the face gear 10 is a drive gear, it is effective to provide the lubricant retaining portion on the radially inner end face 24 side (see FIG. 3) with respect to the teeth 12. In this case, the lubricant outflow prevention wall 25 shown in FIG. 3 is provided on the radially inner side with respect to the lubricant holding portion. Further, for example, a lubricant holding portion similar to the lubricant holding portions 13, 32, and 33 shown in FIGS. 4, 6, and 7 is disposed on the radially inner end face 24 side. Further, the tooth surface 29a on the spur gear 26 side is configured to form a protruding portion D (not shown) that protrudes inside the radial inner edge 21b of the tooth surface 21 on the face gear 10 side shown in FIG. To do. The lubricant held in the lubricant holding portion is sequentially supplied between the tooth surfaces 21 and 29a via the protruding portion D as the face gear 10 rotates, and the tooth surfaces 21 and 29a are lubricated over a long period of time. can do.

  In the first and second embodiments, the case where the counter gear for the face gear 10 is the spur gear 26 has been described as an example. However, the present invention is not limited to this, and the counter gear is, for example, a helical gear. It can also be applied to cases. However, in this case, the teeth of the face gear are assumed to be twisted so as to correspond to the other gear.

  In the above description, the case where the face gear 10 and the counter gear 26 are formed of a resin material by injection molding has been described as an example. However, the present invention is not limited to this, for example, other than injection molding. It may be made of a synthetic resin formed by a manufacturing method, and may be made of metal.

  The face gear of the present invention can be widely applied to, for example, automotive applications, OA equipment, etc., in a means or device for rotationally transmitting power.

1A is a front view of the face gear, FIG. 1B is a view of the face gear teeth 12 of FIG. 1A viewed from the B direction, and FIG. 1C is the view in FIG. It is sectional drawing of the face gear cut | disconnected and shown along the AA line. It is an enlarged view of the vicinity of the tooth | gear shown with the dashed-two dotted line P in FIG.1 (c). However, the figure also shows a spur gear (counter gear) and a motor that mesh with the face gear. FIG. 3A is an enlarged perspective view showing the teeth extracted from the face gear, and FIG. 4B is a view of the teeth viewed from the front side (upper side in FIG. 3A). However, in the same figure, the state which removed the lubricant holding | maintenance part is shown in figure. FIG. 4A is a perspective view illustrating the lubricant holding portion, and FIG. 4B is a view of the lubricant holding portion as viewed from the front side (upper side in FIG. 4A). FIG. 5A is a perspective view for explaining the lubricant holding portion (first modification), and FIG. 5B is a view of the lubricant holding portion as viewed from the front side (above in FIG. 5A). FIG. FIG. 6A is a perspective view for explaining the lubricant holding portion (second modified example), and FIG. 6B is a view of the lubricant holding portion as viewed from the front side (above in FIG. 6A). FIG. FIG. 7A is a perspective view for explaining the lubricant holding portion (third modified example), and FIG. 7B is a view of the lubricant holding portion viewed from the front side (above in FIG. 7A). FIG.

Explanation of symbols

10: Face gear, 11: Web, 12: Teeth, 13, 30, 32, 33 ... Lubricant holding part, 13a, 30a, 32a, 33a ... Reservoir surface, 17 ... Back part, 19a, 3
9a, 49a ... Projection-shaped part, 19b, 39b, 49b ... Space, 21 ... Tooth surface, 21
a …… radially outward edge, 21b …… radially inward edge, 22 …… tooth bottom, 23 …… radially outward edge, 24 …… radially inward edge, 25… ... Lubricant outflow prevention wall, 26 ... Spur gear (mating gear), 29 ... Teeth, 29a ... Tooth surface (mating tooth surface), 31 ... Lubricant stop, W ...
... Tooth thickness direction, D ... Projection part, H ... Virtual extension surface

Claims (11)

Face gear,
A gear device comprising a mating gear meshing with the face gear,
(1). The face gear is
The web,
A back portion formed on the radially outer side of the web;
A tooth tip surface, one tooth surface, and the other tooth surface, a plurality of teeth formed along the circumferential direction on one side surface of the back surface portion; and
The radially outer side end face of the tooth is radially outward and one tooth face of the tooth is radially outward.
One imaginary extension surface formed extending in the direction and the other tooth surface of the tooth extending radially outward.
A lubricant holding portion disposed in a region between the other virtual extension surface formed by
With
(2). The lubricant holding part is
A protrusion-shaped portion formed integrally with the back surface portion;
At least the one virtual extension surface and the other virtual extension surface and the protruding portion
And a space for storing the lubricant,
(3). The counter gear is
When meshing with the face gear, of the both side surfaces in the axial direction of the counterpart gear, the side surface on the radially outer end surface side of the tooth of the face gear is the radially outer end of the tooth surface of the face gear. Located radially outward from the edge,
A gear device characterized by that. The protruding portion of the lubricant holding part is
Lubricant holding part tooth tip surface formed at the same height as the tooth top of the tooth tip surface,
One surface disposed opposite the one virtual extension surface;
The other surface disposed opposite the other virtual extension surface,
The thickness in the tooth thickness direction of the lubricant retaining portion tooth tip surface is formed thinner than the thickness in the tooth thickness direction of the tooth tip surface at the radially outer end surface of the tooth ,
The one surface and the other surface are the one virtual extension surface and the other virtual extension surface.
It was formed at a position separated by a predetermined distance from the inside in the tooth thickness direction.
The gear device according to claim 1. The protruding portion of the lubricant holding part is
The radially inner end face is connected to the radially outer end face of the tooth,
Lubricant holding portion tooth tip surface formed with a lower height in the toothpaste direction than the tooth tip surface of the tooth,
One surface disposed opposite the one virtual extension surface;
The other surface disposed opposite the other virtual extension surface,
The thickness of the lubricant retaining portion tooth tip surface in the tooth thickness direction is the end surface on the radially outer side of the tooth.
It is formed thinner than the thickness of the tooth tip surface in the tooth thickness direction,
The one surface and the other surface is formed at a position spaced by a predetermined distance in the tooth thickness direction in the side from the one of the virtual extension surface and the other of the virtual extension surface,
The gear device according to claim 1 . The protruding shape portion of the lubricant retaining portion is formed such that the cross-sectional area of the cross section in the toothpaste direction increases toward the radially outer side,
The gear device according to claim 2 or 3, wherein In the outward radial direction side edge surface of the protrusion-shaped part of the lubricant holding portion, said projecting shape portion
The outward radial direction side edge lubricant retaining portion the thickness of the tooth thickness direction is formed thicker than the surface definitive formed,
The gear device according to any one of claims 2 to 4, wherein the gear device is provided. A radially inner end surface of the protruding portion of the lubricant retaining portion is a wall surface portion formed so as to face the radially outer end surface of the tooth.
The gear device according to claim 1. On the radially inner side end face of the tooth, a lubricant outflow prevention wall that is higher than the tooth depth of the tooth and formed in an annular shape is provided.
The gear device according to any one of claims 1 to 6, wherein the gear device is provided. Face gear,
A gear device comprising a mating gear meshing with the face gear,
(1). The face gear is
The web,
A back portion formed on the radially outer side of the web;
A tooth tip surface, one tooth surface, and the other tooth surface, a plurality of teeth formed along the circumferential direction on one side surface of the back surface portion; and
The radially inner side end face of the tooth in the radial direction, and one tooth surface of the tooth is radially inward
One imaginary extension surface formed extending in the direction and the other tooth surface of the tooth extending radially inward.
A lubricant holding portion disposed in a region between the other virtual extension surface formed by
With
(2). The lubricant holding part is
A protrusion-shaped portion formed integrally with the back surface portion;
At least the one virtual extension surface and the other virtual extension surface and the protruding portion
And a space for storing the lubricant,
(3). When the mating gear meshes with the face gear, the side surface of the face gear on the radially inner end surface side of the both sides in the axial direction of the mating gear has a diameter on the tooth surface of the face gear. Located on the radially inner side from the inner edge in the direction,
A gear device characterized by that. The protruding portion of the lubricant holding part is
Lubricant holding part tooth tip surface formed at a position on the tooth tip side of the tooth,
One surface disposed opposite the one virtual extension surface;
The other surface disposed opposite the other virtual extension surface,
The radially outer end surface of the protruding portion is connected to the radially inner end surface of the tooth,
The lubricant retaining portion tooth tip surface is formed with a lower height in the toothpaste direction than the tooth tip surface,
The one surface and the other surface is formed at a position spaced by a predetermined distance in the tooth thickness direction in the side from the one of the virtual extension surface and the other of the virtual extension surface,
The gear device according to claim 8. A radially outer side end surface of the protruding portion of the lubricant holding portion is a wall surface portion formed so as to face the radially inner side end surface of the tooth.
The gear device according to claim 8. The face gear and the mating gear are formed by injection molding,
The gear device according to any one of claims 1 to 10, wherein:

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