JP6565537B2 - Gear transmission - Google Patents

Description

  The present invention relates to a gear transmission configured by a first gear and a second gear, such as a face gear and a hypoid gear.

  As a gear transmission apparatus configured as described above, Patent Document 1 discloses a face gear having a plurality of teeth protruding from the outer periphery of a disk portion and an input gear having a twisted tooth portion. A technique for transmitting the rotational force of the input gear to the face gear by arranging them in a mutually different relationship is shown.

  Patent Document 2 discloses a technique for transmitting the rotational force of the pinion gear to the hypoid gear by disposing the hypoid gear and the pinion gear so that their axis centers are different from each other.

JP 2013-155801 A JP 2004-211763 A

  The gear transmission shown in Patent Document 1 or Patent Document 2 obtains a high reduction ratio. However, since both the face gear and the hypoid gear are formed with a plurality of tooth portions on the outer peripheral portion of one surface of the disc-shaped gear body, the tooth thickness of each tooth portion is closer to the rotational axis. Inevitably becomes smaller (thin), and the strength of this part is lowered.

  As an example of a face gear that rotates about an axis, as shown in the drawing of Patent Document 1, a tooth portion is located on the inner side (region close to the rotation axis) than an annular region where a plurality of tooth portions are formed. A concave space is formed which is recessed further in the direction along the rotation axis than the tooth bottom.

  By forming the concave space, a phenomenon in which a part of the tooth portion of the input gear meshing with the face gear (a portion protruding in a direction approaching the axis of the face gear) interferes with the gear body is avoided. . However, by forming this concave space, the plurality of tooth portions of the face gear are cut off at the ends toward the rotation axis in the tooth width direction, which causes a reduction in the strength of the tooth portions. . And when inviting a strength fall in this way, it leads also to a deformation | transformation of a tooth part and a damage of a tooth part.

  Considering the strength of the tooth part, it is possible to improve the strength of the tooth part by increasing the tooth width and reduce the pressure acting on the tooth part in the spur gear, but either the face gear or the hypoid gear However, it is not easy to increase the tooth width. For this reason, it is also conceivable to increase the offset amount between the face gear and the input gear meshing with the face gear, and to enlarge the area of the area where the face gear and the input gear mesh. However, when the offset amount is increased, the gear efficiency is reduced.

  For these reasons, in a gear transmission configured with a pinion gear and a face gear meshing with the pinion gear, it is required to improve the strength of the tooth portion of the face gear.

A feature of the present invention is provided with a pinion gear, and a face gear having a tooth portion protruding from an outer peripheral portion of a disk-shaped disk portion so as to mesh with the pinion gear,
A reinforcing portion is formed across the inner end surface formed at the inner diameter side end portion of both end portions in the tooth trace direction of each tooth portion of the face gear and the surface of the disk portion.

According to this, since the reinforcing portion is formed across the inner end surface which is the inner diameter side in the tooth trace direction among the plurality of tooth portions and the surface of the disk portion, a force is applied to the inner end of the face gear in the tooth trace direction. When this occurs, the force is received by the reinforcing portion, and the amount of deformation can be reduced.
Therefore, in the gear transmission constituted by the pinion gear and the face gear meshing with the pinion gear, the strength of the tooth portion of the face gear is improved, and the deformation and breakage of the tooth portion can be suppressed.

  In the present invention, the tooth portion may be formed in a shape along a predetermined tooth trace, and the reinforcing portion may be formed in a rib shape along the tooth trace.

  According to this, since the reinforcing part is formed in a rib shape in a shape along the tooth trace curve of the tooth part of the face gear, a part of the tooth part of the pinion gear that protrudes in the inner peripheral direction of the tooth part of the face gear is reinforced. Smooth transmission is realized by suppressing inconvenience of contact with the part.

  In the present invention, the reinforcing portion may be set in a rib shape such that the thickness thereof becomes thinner as the position is closer to the axis of the face gear.

  The tooth thickness of the plurality of tooth portions of the face gear is set smaller (thinner) as the position is closer to the axis. By reducing the thickness of the reinforcing portion closer to the axial center in accordance with the tendency of the tooth thickness to become thinner, the portion of the pinion gear tooth portion protruding in the inner circumferential direction of the tooth portion of the face gear has a rib-like reinforcement. Smooth transmission is realized by suppressing inconvenience of contact with the part.

In the present invention, a protruding portion that protrudes in a direction along the axis of the face gear with respect to the surface of the disk portion is formed on an outer peripheral portion of the disk portion, and a plurality of the tooth portions with respect to the protruding portion. And a thick part having an inclined surface inclined from the surface toward the protruding part is integrally formed across the disk part and the protruding part,
The reinforcing portion may be connected to the inner end surface, the inclined surface, and the surface.

  According to this, since the thick part is integrally formed on the inner peripheral part of the projecting part, it becomes possible not only to increase the strength of the boundary part between the projecting part and the disk part, but also the inclined surface of the thick part. In contrast, since the reinforcing portion is formed, the strength of the tooth portion of the face gear is also improved.

It is a top view of a gear transmission. It is a vertical side view of a gear transmission. It is sectional drawing of the tooth | gear part of a 1st gear, and a reinforcement part. It is the IV-IV sectional view taken on the line of FIG. It is a perspective view which shows the tooth | gear part and reinforcement part of a 1st gear. It is an enlarged plan view of a tooth part and a reinforcing part of the first gear. It is a top view of the gear transmission of another embodiment (a). It is a vertical side view of the gear transmission of another embodiment (a). It is sectional drawing of the tooth | gear part and reinforcement part of the 1st gear of another embodiment (a). FIG. 10 is a sectional view taken along line XX in FIG. 9. It is a perspective view which shows the tooth | gear part and reinforcement part of the 1st gear of another embodiment (a). It is sectional drawing of the tooth | gear part and reinforcement part of another embodiment (b) 1st gear. It is a plane enlarged view of the tooth | gear part and reinforcement part of another embodiment (b) 1st gear.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration of gear transmission]
As shown in FIGS. 1 to 6, a face gear G1 that is rotatable about the first axis X1 and a pinion gear G2 that is rotatable about the second axis X2 at a position different from the first axis are mutually connected. The gear transmission is configured by meshing.

  This gear transmission is provided in a transmission system for driving the face gear G1 at a reduced speed by driving and rotating the pinion gear G2 with an actuator such as an electric motor.

  The face gear G1 is connected to the drive hole 2 at the center of the disc-shaped disk portion 1 centered on the first axis X1 in an inserted state. The face gear G1 is supported so as to be rotatable about the first axis X1 via the output shaft. An annular tooth forming region A centering on the first axis X1 is formed on the outer periphery of the disk portion 1, and a plurality of tooth portions 5 are formed in the tooth forming region A.

  The face gear G1 is assumed to be manufactured by forging or pressing, but a plurality of tooth portions 5 are manufactured by cutting a material, or manufactured by resin molding using a mold. But it ’s okay.

  As shown in FIGS. 5 and 6, each of the plurality of tooth portions 5 of the face gear G1 is composed of a tooth tip 5a, a tooth surface 5b, and a tooth bottom 5c. Are formed along. Further, the plurality of tooth tips 5a are arranged on a virtual plane in a posture orthogonal to the first axis X1.

  The pinion gear G2 is configured as a helical gear integrally formed with two gear portions 11 (tooth portions of the pinion gear G2) that are screw-shaped with respect to the shaft 10, and is supported rotatably about the second axis X2.

(Reinforcement part)
In the face gear G1, the disk portion 1 on the inner diameter side (region close to the first shaft core X1) from the tooth portion forming region A where the plurality of tooth portions 5 are formed is connected to the tooth base 5c of the plurality of tooth portions of the first gear. Furthermore, a concave space S that is recessed in the direction along the first axis X1 is formed.

  By forming the concave space S, a portion of the gear portion 11 of the pinion gear G2 that protrudes inward (in the direction of the first axis X1) from the tooth portion formation region A of the face gear G1, and the face gear Interference with the constituent members of G1 (basically the disk portion 1) is suppressed. In addition, by forming the concave space S, for example, the arrangement of the bearings for supporting the protruding portion (inner end portion) in the direction of the first axis X1 in the gear portion 11 of the pinion gear G2 is facilitated. .

  The plurality of tooth portions 5 of the face gear G1 are set such that the portion closer to the first axis X1 has a smaller tooth thickness (thinner). Moreover, since the concave space S is formed, the inner end side in the tooth width direction of the plurality of tooth portions 5 is cut out in the concave space S, and deformation or breakage may be caused due to insufficient strength. In order to solve such a problem, the reinforcing portion 15 is provided between the inner end surface V which is the end portion on the inner diameter side of both end portions of the tooth portion 5 and the disk surface 1S of the disk portion 1 (the surface of the disk portion 1). Is formed.

  As a specific configuration, on the outer periphery of the disk portion 1, a protruding portion 3 that is thick in a state of rising from the disk surface 1 </ b> S in the direction along the first axis X <b> 1 at a position overlapping the tooth portion forming area A 1 is integrally formed. Although the disk portion 1, the protruding portion 3, and the tooth portion 5 are integrally formed, FIG. 3 shows the tooth portion 5, the protruding portion 3, and the disk portion 1 in order to clarify their positional relationship. It is clearly stated.

  The inner end surface V is originally the surface of the end portion on the inner diameter side of the tooth portion 5, but as shown in FIGS. 3 to 5, the end portion on the inner diameter side of the tooth portion 5 (the end portion on the boundary side with the concave space S) ) And the end portion on the inner diameter side of the protruding portion 3 (end portion on the boundary side with the concave space S) are described as the inner end face V.

  That is, the reinforcing portion 15 is formed in a rib shape that rises vertically from the disc surface 1S when the face gear G1 is manufactured by forging or pressing, and the inner end surface V of the tooth portion 5 and the disc of the disc portion 1 are formed. It is integrally formed so as to connect the surface 1S. Further, the reinforcing portion 15 has one side connected to a region from the position close to the tooth tip 5a of the tooth portion 5 to the disk surface 1S in the inner end surface V, and reinforces the disk surface 1S. The other side of the part 15 is connected. Further, the inner end surface V is formed in a region formed in a triangular shape by forming a protruding end line in a region connecting the disk surface 1S from a position close to the tooth tip 5a of the tooth portion 5. .

  The reinforcing portion 15 is formed in a region extending the tooth trace curve of the tooth portion 5 as viewed in the direction along the first axis X1, and has a curved shape with a thickness T with respect to the inner end face V. While connecting, it becomes a shape where thickness becomes thin, so that the position near the 1st axis X1.

  The thickness T of the reinforcing portion 15 may be a value that matches the tooth thickness of the tooth portion 5 on the inner end face V. The height rising from the disk surface 1S may be a value that matches the tooth tip 5a of the tooth portion 5.

[Operation / Effect of Embodiment]
In this way, by forming the reinforcing portion 15 on all of the plurality of tooth portions 5, the pressure is applied from the gear portion 11 of the pinion gear G2 to the inner end position in the tooth width direction among the plurality of tooth portions 5. In this case, the reinforcing portion 15 receives the pressure, and the stress concentration can be reduced. By relaxing the stress concentration in this way, the deformation of the tooth portion 5 is suppressed and the performance is not deteriorated, and the tooth portion 5 is not damaged.

  Moreover, since the reinforcement part 15 is formed in the area | region which follows a tooth trace curve, and the area | region close | similar to the 1st axial center X1 among the reinforcement parts 15, the thickness is made small, Therefore The gear part 11 of the pinion gear G2 is reinforced There is no inconvenience of contacting the portion 15.

  In addition, if the reinforcement part 15 expands the thickness T of the site | part connected with the inner end surface V of the tooth part 5, for example to the value which corresponds with a tooth thickness, very strong reinforcement is implement | achieved.

[Another embodiment]
In addition to the above-described embodiments, the present invention may be configured as follows (the components having the same functions as those of the embodiments are given the same numbers and symbols as those of the embodiments).

(A) As shown in FIGS. 7 to 11, the face gear G <b> 1 has a protruding portion 3 protruding in the direction along the first axis X <b> 1 on the outer periphery of the disk portion 1 with respect to the disk surface 1 </ b> S, and the disk surface 1 </ b> S. The thick portion 4 is provided in a region extending over and above. The thick portion 4 has an inclined surface 4S that is inclined from the disk surface 1S toward the protruding portion 3.

  Also in this configuration, a plurality of tooth portions 5 are formed with respect to the tooth portion forming region A of the protruding portion 3 as in the embodiment, and the reinforcing portion 15 includes the inner end surface V of the tooth portion 5, the inclined surface 4S, and the disk portion. 1 disk surface 1S (the surface of the disk portion 1) is connected to the disk surface 1S.

  Also in the configuration of this other embodiment, the reinforcing portion 15 is a rib-like shape that rises perpendicularly from the disk surface 1S, is formed along a tooth trace curve obtained by extending the tooth trace curve of the tooth portion 5, and is formed with respect to the inner end face V. The thickness T is connected to the first axial center X1 and the thickness is reduced.

  By forming the thick portion 4 in this way, the strength of the boundary portion between the disk portion 1 and the protruding portion 3 is increased, and at the same time, the reinforcing portion 15 improves the strength of the tooth portion 5.

(B) The shape of the reinforcing portion 15 is not limited to the triangle shown in the embodiment. For example, the reinforcing portion 15 is formed so as to extend in a gentle arc from a position connected to the tooth tip 5a as shown in FIG. Alternatively, the extending amount L in the radial direction of the disk portion 1 may be shorter than that of the embodiment. In this other embodiment, the extension amount L of the reinforcing portion 15 in the radial direction of the disk portion 1 is shortened, whereby the end portion in the extending direction of the reinforcing portion 15 (the direction extending in the direction of the first axis X1). And the contact between the pinion gear G2 and the gear portion 11 of the pinion gear G2.

(C) In the configuration in which the extending amount L in the radial direction of the disk portion 1 of the reinforcing portion 15 is shortened as in another embodiment (b), the entire thickness T of the reinforcing portion 15 is shown in FIG. May be configured to be constant. Even in this configuration, since the contact between the reinforcing portion 15 and the gear portion 11 of the pinion gear G2 is suppressed as described in another embodiment (b), the thickness T is kept constant and the strength reduction of the reinforcing portion 15 is suppressed. It is also possible.

  INDUSTRIAL APPLICABILITY The present invention can be used for a transmission device having a gear having a plurality of tooth portions protruding in the direction along the axis on the outer periphery of the disk portion.

1 disc part 1S surface (disc surface)
3 Protruding part 4 Thick part 4S Inclined surface 5 Tooth part 15 Reinforcing part G1 Face gear G2 Pinion gear X1 Shaft core V Inner end face

Claims (4)

With pinion gears,
A face gear having teeth formed on the outer periphery of the disk-shaped disk portion so as to mesh with the pinion gear;
A gear transmission in which a reinforcing portion is formed across an inner end surface formed at an inner diameter side end portion of both end portions in the tooth trace direction of each tooth portion of the face gear and a surface of the disk portion.   The gear transmission according to claim 1, wherein the tooth portion is formed in a shape along a predetermined tooth trace, and the reinforcing portion is formed in a rib shape along the tooth trace.   3. The gear transmission according to claim 1, wherein the reinforcing portion is set in a rib shape such that a thickness thereof becomes thinner as a position closer to an axis of the face gear. A protruding portion that protrudes in a direction along the axis of the face gear with respect to the surface of the disk portion is formed on the outer peripheral portion of the disk portion, and a plurality of tooth portions are formed with respect to the protruding portion. In addition, a thick part having an inclined surface inclined from the surface toward the protruding part is integrally formed across the disk part and the protruding part,
The gear transmission as described in any one of Claims 1-3 with which the said reinforcement part is connected with the said inner end surface, the said inclined surface, and the said surface.

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