JP6642061B2 - Motor with reduction mechanism and power seat device - Google Patents

Description

  The present invention relates to a motor with a speed reduction mechanism and a power seat device.

  In a motor with a reduction mechanism having a motor section and a reduction mechanism for reducing the driving of the motor section, for example, in the motor disclosed in Patent Document 1, an output gear (part of the literature, an output wheel) constituting a part of the reduction mechanism is disclosed. A central output transmission portion coaxial with the output gear is formed at the center of the parent gear. The shaft hole of this output transmission portion is formed so as to be able to engage with the output shaft to be inserted in the circumferential direction, and the rotation of the output gear is transmitted from the shaft hole of the output transmission portion to the output shaft, and The system (in Patent Literature 1, an electric seat device for a vehicle) is operated.

JP 2013-29150 A

  By the way, in the motor with a speed reduction mechanism as described above, when the shaft hole of the output transmission unit is eccentric, the thickness of the output transmission unit around the shaft hole is uneven. Therefore, for example, when the output gear including the output transmission unit is formed of resin, the output transmission unit may be warped such that the axis is curved due to the uneven thickness of the output transmission unit. . If the output transmission portion is warped, the assemblability when inserting the output shaft into the output transmission portion shaft hole deteriorates. In the worst case, the output shaft cannot be inserted and the shaft hole is cut. Processing or the like is required.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor with a speed reduction mechanism that can easily insert an output shaft into a shaft hole formed eccentrically in an output transmission unit. And a power seat device.

A motor with a speed reduction mechanism that solves the above problem includes a motor section and a speed reduction mechanism that reduces the speed of driving of the motor section, and a shaft hole is formed at the center of an output gear that forms a part of the speed reduction mechanism. An eccentric cylindrical output transmission unit is formed, and a motor with a reduction mechanism capable of mounting an output shaft that engages in a circumferential direction in the shaft hole of the output transmission unit. A hollow portion is formed so as to average the amount of material in the circumferential direction of the output transmitting portion, and the hollow portion is formed so as to be integral with the shaft hole .

  According to this configuration, the amount of material in the circumferential direction of the output transmission unit is averaged by the cavity formed in the output transmission unit while the shaft hole of the output transmission unit is eccentric. Thereby, it is possible to suppress the occurrence of warpage in the output transmission portion in which the shaft hole is eccentric, and as a result, the output shaft can be easily inserted into the shaft hole formed eccentrically in the output transmission portion.

According to the configuration of this, since the hollow portion is formed so as to form an integral with the shaft bore, as compared with the case of forming another hole that is separated cavities from the shaft hole, the output transmitting section (output Gear) can be improved.

In the motor with a speed reduction mechanism, it is preferable that the shaft hole has a serrated shape having a concave portion on an inner peripheral surface, and the hollow portion is formed so as to be integral with the concave portion.
According to this configuration, since the hollow portion is formed integrally with the concave portion (serration) of the shaft hole, the shape of the output transmitting portion is simplified while suppressing the warpage of the output transmitting portion by the hollow portion. can do.

A motor with a speed reduction mechanism that solves the above problem includes a motor section and a speed reduction mechanism that reduces the speed of driving of the motor section, and a shaft hole is formed at the center of an output gear that forms a part of the speed reduction mechanism. An eccentric cylindrical output transmission unit is formed, and a motor with a reduction mechanism capable of mounting an output shaft that engages in a circumferential direction in the shaft hole of the output transmission unit. A hollow portion is formed to average the amount of material in the circumferential direction of the output transmission portion, and the output transmission portion has a shape protruding in a cylindrical shape on both axial sides of the output gear, The wall thickness of the peripheral wall of the cylindrical portion on at least one of both sides in the axial direction is formed so that the wall thickness becomes thinner toward the protruding tip side.
According to this configuration, the amount of material in the circumferential direction of the output transmission unit is averaged by the cavity formed in the output transmission unit while the shaft hole of the output transmission unit is eccentric. Thereby, it is possible to suppress the occurrence of warpage in the output transmission portion in which the shaft hole is eccentric, and as a result, the output shaft can be easily inserted into the shaft hole formed eccentrically in the output transmission portion.
According to this configuration, since the thickness of the peripheral wall of the cylindrical portion is made thinner toward the tip end side of the output transmission portion having the cylindrical projection shape, the output transmission portion generated when the output gear is formed is formed. Warpage is suppressed, and the output shaft can be easily inserted into the shaft hole. Further, assembling of the output gear to the gear housing becomes easy, and the clearance between the output gear and the gear housing is reduced, so that generation of abnormal noise and vibration can be suppressed.
In the motor with a speed reduction mechanism, it is preferable that the cavity is formed separately from the shaft hole.
According to this configuration, since the hollow portion is formed separately from the shaft hole, there is no need to change the shape of the shaft hole, and thereby a suitable shaft hole shape (for example, reducing the strength of the shaft hole). (Shape hole shape without any).
In the motor with a speed reduction mechanism, it is preferable that the hollow portion is formed at a portion on the thick side of the output transmission portion caused by the eccentricity of the shaft hole.
According to this configuration, since the hollow portion is formed at a portion on the thick side of the output transmission portion caused by the eccentricity of the shaft hole, the amount of material in the circumferential direction of the output transmission portion can be effectively averaged. it can.

  In the motor with a speed reduction mechanism, the output transmission unit may have a cross-sectional shape orthogonal to an axis of the output gear and a circular shape centered on the axis, and may be supported by a housing that houses the speed reduction mechanism. preferable.

  According to this configuration, since the output gear is configured to be supported by the housing at the output transmission section, the warp of the output transmission section is suppressed by the hollow section, so that the output gear such as a shaft shift can be formed. It is possible to suppress a problem in being supported.

In the motor with a speed reduction mechanism, it is preferable that the shaft hole is a hole that is formed to penetrate the output transmission portion so that the output shaft can be inserted therethrough.
According to this configuration, since the output shaft is inserted through the shaft hole of the output transmission unit, the warp of the output transmission unit (shaft hole) has a greater effect on the assemblability of the output shaft. For this reason, the effect of suppressing the generation of the warpage of the output transmission unit due to the above-described cavity can be more remarkably obtained.

  A power seat device that solves the above problem includes a motor with the speed reduction mechanism, and an output shaft that is inserted through the shaft hole and engages with the shaft hole in a circumferential direction, and a vehicle is provided based on rotation of the output shaft. It is a device that operates the seat.

  According to this configuration, by forming the hollow portion in the output transmission portion in which the shaft hole is eccentric, the output shaft can be easily inserted into the shaft hole, and as a result, the assembling property is excellent. A power seat device can be provided.

  According to the motor with a reduction mechanism and the power seat device of the present invention, the output shaft can be easily inserted into the shaft hole formed eccentrically in the output transmission unit.

It is a schematic structure figure of a power seat device of an embodiment. It is a front view of the motor of the same form. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 3 is an enlarged view of a region A shown in FIG. 2. It is an enlarged front view which shows the output transmission part of another example. FIG. 6 is a sectional view taken along line 6-6 in FIG. 5. It is an enlarged front view which shows the output transmission part of another example. (A) is sectional drawing of another example of a motor, (b) (c) is an enlarged view which shows an inclined part. It is a bottom view of another output wheel. It is a top view of the output wheel of the example. FIG. 11 is a sectional view taken along line 11-11 in FIGS. 9 and 10.

Hereinafter, an embodiment of a motor with a speed reduction mechanism and a power seat device will be described.
As shown in FIG. 1, a power seat device 10 of the present embodiment rotates a seat back 14 of a vehicle seat 13 by rotation of a seat side gear 12 based on a driving force of a motor 11.

As shown in FIG. 2, the motor 11 is a so-called geared motor including a motor unit 20 and a reduction unit 30 that reduces the rotational output of the motor unit 20 to output a high torque.
The motor section 20 includes a yoke housing 21 formed in a bottomed cylindrical shape, a magnet 22 fixed to the inner periphery of the yoke housing 21, and an armature 23 rotatably supported in the yoke housing 21. I have. The armature 23 has a rotating shaft 24 at the center thereof, and the base end (the upper end in FIG. 2) of the rotating shaft 24 is rotatably supported by a bearing (not shown) mounted at the center of the bottom of the yoke housing 21. Have been. A brush (both not shown) is configured to be in sliding contact with the commutator of the armature 23. Power is supplied to this brush from the outside via a connector (not shown), and the brush is Is supplied with power. The yoke housing 21 is formed with a radially extending flange portion 21a on the opening side thereof, and the flange portion 21a is fixed to a gear housing 31 described later with screws (not shown).

  The speed reducer 30 includes a gear housing 31 and a speed reduction mechanism 32 housed in the gear housing 31. The speed reduction mechanism 32 includes a worm shaft 33 that is driven and connected on the same axis L1 as the rotation shaft 24 extending from the motor unit 20, and an output wheel 34 (worm wheel) that meshes with the worm shaft 33.

  The gear housing 31 is made of resin, and includes a shaft housing 35 that houses the worm shaft 33 and a wheel housing 36 that houses the output wheel 34. The wheel housing 36 is formed to extend from the shaft housing 35 in a direction orthogonal to the axial direction of the worm shaft 33 (the direction of the axis L1 of the rotating shaft 24).

  As shown in FIG. 3, the wheel housing portion 36 is formed in a bottomed cylindrical shape having a bottom portion 36 a, and an opening 36 b on the side opposite to the bottom of the wheel housing portion 36 has a substantially disk-like shape constituting the gear housing 31. Is mounted. Through-holes 36 c and 37 a having a circular cross section for supporting the output wheel 34 are formed in the center of the wheel housing 36 and the center of the cover 37, respectively.

  As shown in FIGS. 2 and 3, the output wheel 34 is made of a resin material and is formed by injection molding. At the center of the output wheel 34, a cylindrical output transmission portion 41 is formed rotatably inserted into each of the shaft support holes 36c, 37a. The output transmission section 41 is formed to protrude on both sides of the output wheel 34 in the direction of the axis L2. Further, the output transmitting portion 41 has a cross-sectional shape orthogonal to the axis L2 of the output wheel 34 and has a circular shape centered on the axis L2, and the outer peripheral surface 41a of the output transmitting portion 41 is formed in each of the shaft support holes 36c and 37a. It is rotatable while sliding against the peripheral surface. In this manner, the output wheel 34 has the output transmitting portion 41 formed at the center thereof supported by the shaft supporting holes 36c and 37a. The output transmission portion 41 has a rotation engagement hole 42 (axial hole) penetrating in the direction of the axis L2 of the output wheel 34.

  As shown in FIG. 4, the rotation engagement hole 42 is a serration-shaped hole in which six concave portions 43 a to 43 f that are recessed radially outward from an inner circumferential surface having a circular cross section centered on the axis L <b> 3 are formed. . The axis L3 of the rotation engagement hole 42 is configured to be parallel to the axis of the output transmission portion 41 (coincident with the axis L2 of the output wheel 34) and not to coincide with the axis L2. That is, the rotation engagement hole 42 is an eccentric hole with respect to the axis L2 of the output wheel 34. Further, the rotation engagement hole 42 is formed so as to be symmetric with respect to a straight line L4 orthogonal to both the axis L2 and the axis L3 of the rotation engagement hole 42 when viewed from the direction of the axis L2 of the output wheel 34. ing. Further, the rotation engagement hole 42 is formed so that its cross-sectional shape is the same over the entirety in the direction of the axis L3.

  Here, the six concave portions of the rotation engagement hole 42 are sequentially denoted by reference numerals “43a” to “43f” in a clockwise direction, and the concave portions 43a and 43b, the concave portions 43c and 43f, and the concave portions 43d. The recesses 43e are symmetrical with respect to the straight line L4. That is, the concave portions 43a and 43b, the concave portions 43c and 43f, and the concave portions 43d and 43e are formed to have the same radial dimension.

  Of these six recesses 43a to 43f, the radial dimension D1 of the two recesses 43a and 43b on the eccentric direction side of the rotational engagement hole 42 (the thin side of the peripheral wall of the output transmission unit 41 and the upper side in FIG. 4). Is formed the shortest. On the other hand, the radial dimension D2 of the two concave portions 43d and 43e on the thick side (the lower side in FIG. 4) of the peripheral wall of the output transmitting portion 41 is formed to be the longest among the six concave portions 43a to 43f. The radial dimension D3 of the concave portions 43c and 43f intermediate the concave portions 43a and 43b and the concave portions 43d and 43e is longer than the radial dimension D1 of the concave portions 43a and 43b, and the radial direction of the concave portions 43d and 43e. It is set shorter than the dimension D2. In the present embodiment, the radial dimension D3 of the concave portions 43c and 43f is set to be approximately twice the radial dimension D1 of the concave portions 43a and 43b, and the radial dimension D2 of the concave portions 43d and 43e is set to the concave portions 43a and 43b. Is set to be approximately three times the radial dimension D1 of. With such a dimension setting, the thickness from each of the recesses 43a to 43f in the output transmission unit 41 to the outer peripheral surface 41a of the output transmission unit 41 is approximately equal to each other.

  An output shaft 51 connected to the seat-side gear 12 is inserted through the rotation engagement hole 42. The output shaft 51 is coaxial with the rotation engagement hole 42 and has a serration shape on its outer peripheral surface that meshes with the rotation engagement hole 42.

  More specifically, on the outer peripheral surface of the output shaft 51, there are formed six convex portions 52 that fit into the concave portions 43a to 43f of the rotation engagement hole 42, respectively. These six protrusions 52 have the same shape as each other. That is, the radial dimension (projection amount) of each projection 52 is equal to each other, and the radial dimension is set to be substantially the same as or slightly smaller than the radial dimension D1 of the recesses 43a and 43b of the rotation engagement hole 42. ing. Thus, between the concave portions 43c and 43f and the convex portions 52 fitted into them, and between the concave portions 43d and 43e and the convex portions 52 fitted into them, in the radial direction (radial direction around the axis L3). A gap S is formed. Note that, of course, the radial width of the gap S formed between the concave portions 43d and 43e and the convex portions 52 fitted therein is formed between the concave portions 43c and 43f and the convex portions 52 fitted therein. The gap S is longer than the radial width.

  As described above, the respective protrusions 52 of the output shaft 51 are fitted into the respective recesses 43a to 43f of the rotation engagement hole 42, so that the output shaft 51 can be circumferentially engaged with the rotation engagement hole 42. ing. The output shaft 51 extends from the rotation engagement hole 42 to both sides in the axial direction, and the seat-side gear 12 is connected to both ends of the output shaft 51.

Next, the operation of the present embodiment will be described.
The rotational drive of the rotating shaft 24 of the motor unit 20 is reduced by the worm shaft 33 and the output wheel 34 and transmitted to the output shaft 51. Here, the axis of the output shaft 51 inserted into the rotation engagement hole 42 of the output transmission unit 41 (the output wheel 34) coincides with the axis L3 of the rotation engagement hole 42 eccentric with respect to the axis L2 of the output wheel 34. I do. That is, when the output wheel 34 including the output transmission unit 41 rotates about the axis L2, the output shaft 51 circumferentially engaged with the rotation engagement hole 42 rotates eccentrically with respect to the axis L2 of the output wheel 34. Each of the seat gears 12 connected to both ends of the output shaft 51 also eccentrically rotates together with the output shaft 51, and the tilting movement of the seat back 14 is realized based on the eccentric rotation of each of the seat gears 12.

Next, the characteristic effects of the present embodiment will be described.
(1) In order to engage the rotation engagement hole 42 with the output shaft 51 in the circumferential direction, each of the recesses 43 a to 43 f on the inner peripheral surface of the rotation engagement hole 42 has a size corresponding to the projection 52 of the output shaft 51. This is sufficient (that is, if the concave portions 43a to 43f are unified with the radial dimension D1). However, in this case, since the amount of resin (material amount) in the circumferential direction of the output transmitting portion 41 is significantly unbalanced due to the eccentricity of the rotation engagement hole 42, the amount of resin contraction in the circumferential direction becomes unbalanced, and the output power is transmitted. Warpage occurs in which the portion 41 falls to the thick side. Therefore, in the present embodiment, in order to average the amount of resin in the circumferential direction of the output transmission portion 41, the concave portions 43c, 43d, 43c, 43d, formed in the thick portion of the output transmission portion 41 due to the eccentricity of the rotation engagement hole 42. The radial dimensions D2 and D3 of 43e and 43f are set to be longer than the radial dimensions D1 of the concave portions 43a and 43b on the thin side. In other words, the concave portions 43c, 43d, 43e, and 43f are configured to include a hollow portion for averaging the amount of resin in the circumferential direction of the output transmitting portion 41.

  According to this configuration, the amount of resin in the circumferential direction of the output transmission unit 41 is reduced by the recesses 43 c, 43 d, 43 e, and 43 f formed by extending the cavity while the rotation engagement hole 42 of the output transmission unit 41 is eccentric. Averaged. Thereby, since the shrinkage balance of the resin constituting the output transmission unit 41 is averaged in the circumferential direction, it is possible to suppress the occurrence of the warpage of the output transmission unit 41 that is curved with respect to the axis L2. As a result, the output shaft 51 can be easily inserted into the rotation engagement hole 42.

  (2) Since the rotation engagement hole 42 is configured to include the cavity (that is, the rotation engagement hole 42 and the cavity are integrated), the cavity is separated from the rotation engagement hole 42. This can contribute to improvement in the formability of the output transmission section 41 (output wheel 34) as compared with the case where the output transmission section 41 is formed.

  Further, in the present embodiment, since the hollow portion is formed integrally with the concave portions 43c, 43d, 43e, and 43f in the rotation engagement hole 42, the output is suppressed while suppressing the warpage of the output transmission portion 41. The shape of the transmission section 41 can be simplified.

  (3) The output transmission unit 41 has a cross-sectional shape perpendicular to the axis L2 of the output wheel 34, has a circular shape centered on the axis L2, and is supported by the gear housing 31 that houses the reduction mechanism 32. By suppressing the warpage of the portion 41, it is possible to suppress a problem such as a shaft shift when the output wheel 34 is axially supported.

  (4) The rotation engagement hole 42 is a hole formed through the output transmission portion 41 so that the output shaft 51 can be inserted therethrough. Since the output shaft 51 is inserted through the rotation engagement hole 42, the warp of the output transmission portion 41 (the rotation engagement hole 42) has a greater effect on the assemblability of the output shaft 51. Therefore, the effect of suppressing the warpage of the output transmission unit 41 as described above can be more remarkably obtained.

The above embodiment may be modified as follows.
In the above embodiment, a part of the concave portion (the concave portion 43c, 43d, 43e, 43f) of the rotation engagement hole 42 is formed to be long, that is, the hollow portion is formed so as to be integral with the concave portion 43c, 43d, 43e, 43f. did. However, the present invention is not particularly limited to this. For example, a cavity in which the projection 52 of the output shaft 51 is not fitted at a position different from the recesses 43c, 43d, 43e, and 43f on the inner peripheral surface of the rotation engagement hole 42. The portion may be recessed. By forming such a cavity, the amount of resin in the circumferential direction of the output transmitting section 41 can be averaged, and the occurrence of warpage of the output transmitting section 41 can be suppressed.

  In the above-described embodiment, the rotation engagement hole 42 is configured to include the hollow portion, that is, the rotation engagement hole 42 and the hollow portion are formed as an integral body. Instead, the cavity may be formed separately from the rotation engagement hole 42.

  For example, in the examples shown in FIGS. 5 and 6, the output transmission portion 41 is formed with a hollow portion 61 separated from the rotation engagement hole 42. In this example, the radial dimension of each of the recesses 43a to 43f (serration) formed on the inner peripheral surface of the rotation engagement hole 42 is unified with the radial dimension D1 of the recesses 43a and 43b in the above embodiment. I have. That is, unlike the above-described embodiment, the concave portions 43c, 43d, 43e, and 43f have no hollow portion.

  The hollow portion 61 is formed in a portion on the thick wall side (a portion on the anti-eccentric direction side of the rotation engagement hole 42) caused by the eccentricity of the rotation engagement hole 42 on the peripheral wall around the rotation engagement hole 42 of the output transmission portion 41. Is formed. In other words, the cavity 61 is formed on the opposite side of the axis L3 of the rotation engagement hole 42 with respect to the axis of the output transmission section 41 (coincident with the axis L2 of the output wheel 34). The hollow portion 61 is formed in a substantially crescent shape that is line-symmetric with respect to the straight line L4 (a straight line orthogonal to the axis lines L2 and L3) when viewed from the axial direction. That is, the hollow portion 61 is formed so that the center in the circumferential direction overlaps with the straight line L4 and the width in the radial direction decreases from the center to both ends in the circumferential direction. The hollow portion 61 is a concave portion formed along the axial direction from both end surfaces in the axial direction of the output transmission portion 41 and does not penetrate the output transmission portion 41 (see FIG. 6), but is not particularly limited to this. Instead, the hollow portion 61 may be formed to penetrate along the axial direction.

  Even with such a configuration, the amount of resin in the circumferential direction of the output transmission unit 41 can be averaged, and the occurrence of warpage of the output transmission unit 41 can be suppressed. Further, in the above configuration, since the hollow portion 61 is formed separately from the rotation engagement hole 42, the serration shape formed by the concave portions 43a to 43f of the rotation engagement hole 42 is changed to the serration shape of the output shaft 51 (the outer periphery). Although the shape is substantially the same as that of the convex portion 52 (that is, it is not necessary to change the shape of the rotation engagement hole 42), the generation of the warp of the output transmission portion 41 can be suppressed by the hollow portion 61. In the case where the radial dimension of the concave portions 43c, 43d, 43e, 43f is increased as in the above-described embodiment, there is a concern that the strength of the serration of the rotation engagement hole 42 may be reduced, but in the example shown in FIG. By making the serration shape of the hole 42 substantially the same as the serration shape of the output shaft 51, it is possible to suppress a decrease in the strength of the serration of the rotation engagement hole 42.

  Further, in the example shown in FIG. 5, only one hollow portion 61 is provided, but for example, as shown in FIG. 7, the hollow portion 61 may be divided into a plurality of portions. In the example shown in FIG. 7, the cavity 61 in the example shown in FIG. 5 is divided at positions corresponding to the recesses 43d and 43e (radially outside positions of the recesses 43d and 43e), and three cavity portions 61a, 61b and 61c are formed. Even with such a configuration, the amount of resin in the circumferential direction of the output transmission unit 41 can be averaged, and the occurrence of warpage of the output transmission unit 41 can be suppressed.

  In the examples shown in FIGS. 5 and 7, the hollow portions 61, 61 a, 61 b, and 61 c are holes formed along the axial direction from the shaft end face of the output transmission unit 41. A concave portion provided on the outer peripheral surface 41a of the transmitting portion 41 may be used as a hollow portion.

  In the above embodiment, the rotation engagement hole 42 is a hole formed to penetrate the output transmission portion 41 so that the output shaft 51 can be inserted therethrough. However, the present invention is not limited to this. The portion 41 may be a concave hole that does not penetrate, and the output shaft 51 inserted into the hole may extend only in one axial direction.

-The number of the concave portions 43a to 43f on the inner periphery of the rotary engagement hole 42 is not limited to six in the above embodiment, but may be changed as appropriate according to the configuration.
In the above-described embodiment, the output transmission unit 41 has a circular cross section having a cross section perpendicular to the axis L2 of the output wheel 34 and has a circular shape centered on the axis L2, and is supported by the gear housing 31 that houses the speed reduction mechanism 32. However, the present invention is not particularly limited to this, and if the supported portion that is supported by the gear housing 31 is provided on the output wheel 34 separately from the output transmission unit 41, the cross-sectional outer shape of the output transmission unit 41 is not circular. It is also possible to adopt a configuration in which the output wheel 34 is not pivotally supported by the output transmission unit 41 as a shape.

In the above-described embodiment, the outer peripheral surface 41a of the output transmission unit 41 has a linear shape with a constant diameter in the entire axial direction. However, as shown in FIG. Good.
As shown in FIG. 8A, the outer peripheral surface 41a of the output transmission section 41 includes a linear section 44 that is linear at the center in the axial direction, and an inclined section 45 that is tapered at both axial ends. The inclined portion 45 is continuous with the linear portion 44, and has a smaller diameter toward both ends in the axial direction. In other words, since the diameter of the rotation engagement hole 42 inside the output transmission portion 41 is constant in the entire axial direction, the provision of the inclined portion 45 makes the thickness of the peripheral wall of the cylindrical portion of the output transmission portion 41 thicker. Are made thinner toward the protruding tip side.

  With this configuration, first, the function of the linear portion 44 at the axial center of the output transmission portion 41 as a bearing surface for the bearing holes 36c and 37a is maintained. Further, the thickness of the peripheral wall of the cylindrical portion of the output transmission portion 41 is reduced by the inclined portion 45 provided on the end side with respect to the straight portion 44, so that the warpage of the output transmission portion 41 generated when the output wheel 34 is formed. (Deformation due to sink marks) is suppressed, and the output shaft 51 can be easily inserted into the rotation engagement hole 42. Further, assembling of the output wheel 34 to the gear housing 31 is facilitated and the clearance between the output wheel 34 and the gear housing 31 can be reduced, so that generation of abnormal noise and vibration can be suppressed.

  Incidentally, as shown in FIGS. 8B and 8C, the output transmitting portion 41 is configured such that the amount of protrusion in the axial direction is slightly larger on the bottom portion 36a side of the gear housing 31 than on the cover member 37 side. The angle .theta.1 between the inclined portion 45a on the bottom portion 36a side, which is the larger side, and the linear portion 44 is made larger than the angle .theta.2, and the linear portion 44 of the inclined portion 45b on the side of the lid member 37, which is the side with the smaller amount of protrusion. Is made smaller (than angle θ1). Note that the relationship between the angle θ1 and the angle θ2 is not limited to this, and the axial transmission amount of the output transmission unit 41, such as making the angle θ1 larger than the angle θ2, making the angles θ1 and θ2 the same angle, and the like. May be changed as appropriate. Further, the inclined portion 45 may be provided on only one side (the bottom portion 36a side or the lid member 37 side) of both ends in the axial direction of the output transmission portion 41.

The output wheel 34 may have a configuration as shown in FIGS. 9 to 11, for example.
As shown in FIGS. 9 and 10, the output wheel 34 includes an outer peripheral tooth portion 71 that forms an annular shape at the outer peripheral edge, and a connecting portion 72 that connects the outer peripheral tooth portion 71 and the output transmission portion 41 at the center. Have. Further, the connecting portion 72 includes an inner connecting portion 73 and an outer connecting portion 74.

  The inner peripheral connecting portion 73, which is a portion of the connecting portion 72 on the side of the output transmitting portion 41, has six concave portions 73a and 73b on both surfaces thereof at regular intervals in the circumferential direction. Each of the concave portions 73 a and 73 b has a groove shape extending from the outer edge of the output transmitting portion 41 to the inner edge of the outer peripheral connecting portion 74. As shown in FIG. 9, the concave portion 73 a on the bottom surface side (the bottom portion 36 a side) is formed at the same position as the concave portions 43 a to 43 f of the output transmission unit 41. On the other hand, the concave portion 73b on the upper surface side (the lid member 37 side) is formed between the concave portions 43a to 43f of the output transmission portion 41 as shown in FIG. That is, as shown in FIG. 11, the concave portions 73a on the bottom surface side and the concave portions 73b on the upper surface side are alternately arranged at equal intervals in the circumferential direction. Note that a thick portion 73c exists between the recesses 73a and 73b.

  With this configuration, the concave portions 73a and 73b provided on both surfaces of the inner peripheral connecting portion 73 prevent the thick portion of the inner peripheral connecting portion 73 from being formed in a shape that is continuous in the circumferential direction. Since the thick portions 73c have a shape scattered at equal intervals in the circumferential direction, it is possible to suppress deformation due to sink of the inner circumferential connecting portion 73 generated when the output wheel 34 is formed, and furthermore, displacement of the output transmitting portion 41 can be suppressed. Further, since the thick portion 73c is partially left in the inner connecting portion 73, the strength of the inner connecting portion 73 connected to the output transmitting portion 41 can be sufficiently ensured.

  Incidentally, also in the outer peripheral connecting portion 74 which is the portion of the connecting portion 72 on the outer peripheral tooth portion 71 side, the configuration is different between the bottom surface side and the upper surface side. A plurality of holes 74a are formed at equal intervals in the circumferential direction on the bottom surface side (the bottom portion 36a side) of the outer peripheral connection portion 74. On the other hand, on the upper surface side (the lid member 37 side) of the outer peripheral connecting portion 74, an inclined surface 74b is formed which becomes gradually taller toward the outer peripheral tooth portion 71 side. On the inclined surface 74b, holes 74c of the same number and the same shape as the holes 74a on the opposite side surface are provided at equal intervals in the circumferential direction. The holes 74a on the bottom surface and the holes 74c on the upper surface are also arranged alternately in the circumferential direction.

  In the above embodiment, the output wheel 34 is configured to mesh with the worm shaft 33. However, for example, one or more intermediate gears may be interposed between the worm shaft 33 and the output wheel 34. Is also good.

  In the above embodiment, the present invention is embodied in the power seat device 10 of the vehicle, but may be embodied in a device other than the power seat device 10.

  DESCRIPTION OF SYMBOLS 10 ... Power seat device, 11 ... Motor, 13 ... Vehicle seat, 20 ... Motor part, 31 ... Gear housing (housing), 32 ... Reduction mechanism, 34 ... Output wheel (output gear), 37 ... Gear housing Lid member, 41: output transmission portion, 42: rotation engagement hole (shaft hole), 43c, 43d, 43e, 43f: concave portion constituting hollow portion, 51: output shaft, 61, 61a, 61b, 61c: hollow portion .

Claims (8)

A motor unit, comprising a speed reduction mechanism for reducing the driving of the motor unit,
At the center of the output gear that constitutes a part of the speed reduction mechanism, a cylindrical output transmission unit having an eccentric shaft hole is formed,
A motor with a speed reduction mechanism capable of mounting an output shaft that engages in a circumferential direction within the shaft hole of the output transmission unit,
In the output transmission unit, a cavity is formed to average the amount of material in the circumferential direction of the output transmission unit ,
The motor with a speed reduction mechanism , wherein the hollow portion is formed so as to be integral with the shaft hole . The motor with a reduction mechanism according to claim 1 ,
The shaft hole has a serrated shape having a concave portion on the inner peripheral surface,
A motor with a speed reduction mechanism, wherein the cavity is formed so as to be integral with the recess. A motor unit, comprising a speed reduction mechanism for reducing the driving of the motor unit,
At the center of the output gear that constitutes a part of the speed reduction mechanism, a cylindrical output transmission unit having an eccentric shaft hole is formed,
A motor with a speed reduction mechanism capable of mounting an output shaft that engages in a circumferential direction within the shaft hole of the output transmission unit,
In the output transmission unit, a cavity is formed to average the amount of material in the circumferential direction of the output transmission unit,
The output transmitting portion is formed in a cylindrical shape protruding on both sides in the axial direction of the output gear, and the thickness of the peripheral wall of the cylindrical portion on at least one of both sides in the axial direction is thinner toward the protruding tip side. A motor with a speed reduction mechanism, characterized in that it is formed in the following manner. The motor with a reduction mechanism according to claim 3 ,
A motor with a speed reduction mechanism, wherein the hollow portion is formed separately from the shaft hole. The motor with a reduction mechanism according to any one of claims 1 to 4 ,
The motor with a speed reduction mechanism, wherein the hollow portion is formed in a portion on the thick side of the output transmission portion caused by the eccentricity of the shaft hole. The motor with a speed reduction mechanism according to any one of claims 1 to 5,
A motor with a speed reduction mechanism, wherein the output transmission portion has a cross-sectional shape perpendicular to the axis of the output gear, and has a circular shape centered on the axis, and is supported by a housing that houses the speed reduction mechanism. . The motor with a reduction mechanism according to any one of claims 1 to 6,
The motor with a speed reduction mechanism, wherein the shaft hole is a hole formed to penetrate the output transmission portion so that the output shaft can be inserted therethrough. A motor with a speed reduction mechanism according to claim 7 ,
A power seat device, comprising: an output shaft that is inserted through the shaft hole and engages with the shaft hole in a circumferential direction, and activates a vehicle seat based on rotation of the output shaft.

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