CN213298712U - Planetary gear reduction device, gear motor, and drive device - Google Patents
Planetary gear reduction device, gear motor, and drive device Download PDFInfo
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- CN213298712U CN213298712U CN202021598330.2U CN202021598330U CN213298712U CN 213298712 U CN213298712 U CN 213298712U CN 202021598330 U CN202021598330 U CN 202021598330U CN 213298712 U CN213298712 U CN 213298712U
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- 239000007787 solid Substances 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 description 9
- 230000002452 interceptive effect Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
Provided are a planetary gear reduction device, a gear motor, and a drive device, which can achieve the miniaturization of the entire device. The planetary gear reduction device (22) is provided with: a pinion (25) coupled to the motor shaft (24); a planetary gear (61) made of resin; a carrier (71) that is rotatable coaxially with the pinion gear; and an internal gear (232) that holds the planetary gear so as to be capable of revolving around the pinion gear. The planetary gear meshes with the pinion gear and rotates in accordance with the rotation of the pinion gear. The carrier (71) rotatably holds the planetary gear (61). The carrier (71) has a solid shaft portion (712) extending coaxially with the planetary gears (61). A bearing recess (612) for receiving a solid shaft (712) of the carrier (71) is formed on the upper side of the planetary gear (61). A gate portion (614) projecting downward is formed below the planetary gear (61).
Description
Technical Field
The present invention relates to a planetary gear reduction device, a gear motor, and a drive device, and particularly to a planetary gear reduction device having a resin-made planetary gear.
Background
In a gear motor incorporated in a small-sized drive device, a planetary gear reduction device may be used in order to obtain a large torque by reducing the rotation of the motor. In such a planetary gear reduction device, since it is necessary to reduce the size of the planetary gear incorporated therein, a resin-made planetary gear that is easily manufactured by injection molding or the like is often used (for example, see patent document 1).
In this injection molding, a resin material melted by heating is injected into a mold, and after the resin material is cooled and solidified, a molded article is taken out from the mold. At this time, a gate portion remains in the molded article due to an injection port (gate) through which the resin is injected into the molded article. In the planetary gear reduction device disclosed in patent document 1, the gate portion formed in the planetary gear is housed inside the recess portion formed in the shaft portion of the carrier, thereby shortening the axial length of the planetary gear reduction device and achieving miniaturization.
However, since the planetary gear reduction device disclosed in patent document 1 has a recess formed in the shaft portion of the carrier, the thickness of the shaft portion of the carrier in the radial direction is reduced. Therefore, in order to maintain the strength of the shaft portion of the carrier, the diameter of the shaft portion of the carrier must be increased to some extent, and there is a limit to reducing the size of the carrier. As a result, it is difficult to further reduce the size of the entire planetary gear reduction unit.
Patent document 1: japanese patent laid-open publication No. 2016-
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above problems of the prior art, and a first object of the present invention is to provide a planetary gear reduction gear capable of reducing the size of the entire device.
In addition, a second object of the present invention is to provide a small gear motor.
A third object of the present invention is to provide a small-sized driving device.
According to the utility model discloses an aspect 1 provides the planetary gear reduction unit that can realize the holistic miniaturization of device. The planetary gear reduction device is used for reducing the rotation of the input shaft and transmitting the rotation to the output shaft. The planetary gear reduction device includes: a 1 st sun gear coupled to the input shaft; a 1 st planetary gear made of resin; a 1 st carrier that is rotatable coaxially with the 1 st sun gear; and an internal gear that holds the 1 st planetary gear so as to be capable of revolving around the 1 st sun gear. The 1 st planetary gear meshes with the 1 st sun gear and rotates in accordance with the rotation of the 1 st sun gear. The 1 st carrier rotatably holds the 1 st planetary gear. The 1 st carrier has a 1 st solid shaft portion extending coaxially with the 1 st planetary gear. A 1 st bearing recess portion that receives the 1 st solid shaft portion of the 1 st carrier is formed on the output shaft side of the 1 st planetary gear. A 1 st gate portion protruding toward the input shaft is formed on the 1 st planetary gear on the input shaft side.
According to this configuration, since the 1 st gate portion of the 1 st planetary gear made of resin is formed on the input shaft side of the 1 st planetary gear, it is not necessary to form a recess portion in the shaft portion of the 1 st carrier, and the 1 st solid shaft portion of the 1 st carrier can be received in the 1 st bearing recess portion of the 1 st planetary gear. Therefore, even if the shaft portion of the 1 st carrier is thinned, the strength of the shaft portion of the 1 st carrier can be maintained. As a result, the size of the 1 st carrier can be reduced, and the entire planetary gear reduction device can be downsized.
Preferably, the 1 st gate of the 1 st planetary gear is located on a central axis of the 1 st planetary gear. In this case, the heat shrinkage at the time of molding the 1 st planetary gear can be made uniform over the entire 1 st planetary gear, and the dimensional accuracy of the 1 st planetary gear can be improved.
The planetary gear reduction device may further include a flange having an annular wall that abuts against a portion of the 1 st abutment surface of the 1 st planetary gear on the input shaft side. In this case, a 1 st gate moving space for moving the 1 st gate of the 1 st planetary gear between the 1 st planetary gear and the flange may be defined inside the annular wall of the flange in the radial direction.
According to this configuration, when the 1 st planetary gear rotates, the 1 st gate portion of the 1 st planetary gear can move in the 1 st gate portion movement space without interfering with the flange. Further, since only a part of the 1 st contact surface of the 1 st planetary gear is in sliding contact with the annular wall of the flange and the 1 st planetary gear rotates, the contact area between the 1 st planetary gear and the flange becomes small. Therefore, the frictional resistance generated when the 1 st planetary gear rotates can be reduced.
The 1 st carrier may have a 2 nd sun gear disposed coaxially with the 1 st sun gear. In this case, the planetary gear reduction device may further include: a 2 nd planetary gear made of resin; and a 2 nd carrier rotatable coaxially with the 2 nd sun gear. The 2 nd planetary gear may be engaged with the 2 nd sun gear and may rotate in accordance with the rotation of the 2 nd sun gear. The 2 nd carrier may rotatably hold the 2 nd planetary gear. The internal gear may hold the 2 nd planetary gear so as to be capable of revolving around the 2 nd sun gear. The 2 nd carrier may have a 2 nd solid shaft portion extending coaxially with the 2 nd planetary gear. A 2 nd bearing recess portion that receives the 2 nd solid shaft portion of the 2 nd carrier may be formed on the output shaft side of the 2 nd planetary gear. A 2 nd gate portion protruding toward the input shaft may be formed on the input shaft side of the 2 nd planetary gear.
According to this configuration, since the 2 nd gate portion of the 2 nd planetary gear made of resin is formed on the input shaft side of the 2 nd planetary gear, it is not necessary to form a recess portion in the shaft portion of the 2 nd carrier, and the 2 nd solid shaft portion of the 2 nd carrier can be received in the 2 nd bearing recess portion of the 2 nd planetary gear. Therefore, even if the shaft portion of the 2 nd carrier is thinned, the strength of the shaft portion of the 2 nd carrier can be maintained. As a result, the size of the 2 nd carrier can be reduced, and the entire planetary gear reduction device can be downsized.
Preferably, the 2 nd gate of the 2 nd planetary gear is located on a central axis of the 2 nd planetary gear. In this case, the heat shrinkage at the time of molding the 2 nd planetary gear can be made uniform over the entire 2 nd planetary gear, and the dimensional accuracy of the 2 nd planetary gear can be improved.
The 1 st carrier may have an abutting portion that abuts against a portion of a 2 nd abutting surface of the 2 nd planetary gear on the input shaft side. In this case, a 2 nd gate moving space for moving the 2 nd gate of the 2 nd planetary gear between the 2 nd planetary gear and the 1 st carrier may be defined outside the contact portion of the 1 st carrier in the radial direction.
According to such a configuration, when the 2 nd planetary gear rotates, the 2 nd gate portion of the 2 nd planetary gear can move in the 2 nd gate portion movement space without interfering with the 1 st carrier. Further, since only a part of the 2 nd contact surface of the 2 nd planetary gear is in sliding contact with the contact portion of the 1 st carrier and the 2 nd planetary gear rotates, the contact area between the 2 nd planetary gear and the 1 st carrier is reduced. Therefore, the frictional resistance generated when the 2 nd planetary gear rotates can be reduced.
According to the 2 nd aspect of the present invention, a small gear motor is provided. The gear motor has: the above-described planetary gear reduction unit; and a motor having a motor shaft coupled to the 1 st sun gear of the planetary gear reduction unit.
According to the 3 rd aspect of the present invention, a small-sized driving device is provided. The driving device is used for moving the driving object along the axial direction. The drive device includes: the above-mentioned gear motor; a frame to which the gear motor is attached; a screw rod extending in the axial direction and rotated by the gear motor; and a movable member having a nut portion screwed with the lead screw.
According to the present invention, since the 1 st gate portion of the 1 st planetary gear made of resin is formed on the input shaft side of the 1 st planetary gear, it is not necessary to form a recess portion in the shaft portion of the 1 st carrier, and the 1 st solid shaft portion of the 1 st carrier can be received in the 1 st bearing recess portion of the 1 st planetary gear. Therefore, even if the shaft portion of the 1 st carrier is thinned, the strength of the shaft portion of the 1 st carrier can be maintained. As a result, the size of the 1 st carrier can be reduced, and the entire planetary gear reduction device can be downsized.
Drawings
Fig. 1 is a perspective view showing a drive device according to an embodiment of the present invention.
Fig. 2 is an exploded perspective view of the gear motor in the drive device shown in fig. 1, as viewed from above.
Fig. 3 is an exploded perspective view of the gear motor shown in fig. 2 as viewed from below.
Fig. 4 is a partial sectional view of the gear motor shown in fig. 1 cut by a plane containing one central axis of the motor shaft and the planetary gear.
Description of the reference symbols
1: a drive device; 10: a frame; 11: an upper flange portion; 12: a lower flange portion; 13: a fixed part; 20: a gear motor; 21: a motor; 22: a planetary gear reduction; 23: a gear housing; 24: a motor shaft; 25: pinion (1 st sun gear); 30: a lead screw; 31: an upper side bearing; 32: a lower bearing; 40: a movable member; 41: a nut portion; 42: a sliding part; 50: a guide shaft; 61: a planetary gear (1 st planetary gear); 62: a planetary gear (2 nd planetary gear); 71: a carrier (1 st carrier); 72: a carrier (2 nd carrier); 80: a flange; 85: an annular wall; 231: a bearing holding portion; 232: an internal gear; 233: a cylindrical portion; 234: a rectangular plate-like portion; 612: a bearing recess (1 st bearing recess); 614: a gate portion (1 st gate portion); 615: a lower surface (1 st abutment surface); 622: a bearing recess (2 nd bearing recess); 624: a gate portion (2 nd gate portion); 625: a lower surface (2 nd abutment surface); 711: a planet carrier body; 712: a solid shaft portion (1 st solid shaft portion); 713: pinion (2 nd sun gear); 715: an abutting portion; 721: a planet carrier body; 722: a solid shaft portion (2 nd solid shaft portion); 723: a shaft coupling portion; s1: 1 st gate moving space; s2: the 2 nd gate part moving space.
Detailed Description
Hereinafter, an embodiment of a drive device including a planetary gear reduction device according to the present invention will be described in detail with reference to fig. 1 to 4. In fig. 1 to 4, the same or corresponding components are denoted by the same reference numerals, and redundant description thereof is omitted. In fig. 1 to 4, the scale and size of each component may be exaggerated, and some components may be omitted.
Fig. 1 is a perspective view showing a drive device 1 according to an embodiment of the present invention. The drive device 1 of the present embodiment moves a drive target object such as a lens or a camera in an electronic device such as a laser irradiation type disk device or a smartphone as necessary, but the application thereof is not limited to this. In the present embodiment, for convenience, the + Z direction in fig. 1 is referred to as "up" or "upper", and the-Z direction is referred to as "down" or "lower".
As shown in fig. 1, the drive device 1 includes: a frame 10 attached to an electronic device main body (not shown) such as a smartphone main body; a gear motor 20 attached to the frame 10; a lead screw 30 extending in the Z direction (axial direction); a movable member 40 engaged with the screw shaft 30; and a guide shaft 50 that guides the movement of the movable member 40 in the Z direction.
The frame 10 includes an upper flange 11, a lower flange 12, and a fixing portion 13 having screw holes 13A into which fixing screws are inserted. The frame 10 is fixed to the electronic apparatus main body by inserting screws (not shown) into screw holes 13A of the fixing portion 13 and screwing the screws into the electronic apparatus main body.
The screw shaft 30 is attached to the upper flange portion 11 and the lower flange portion 12 of the frame 10 via an upper bearing 31 and a lower bearing 32, respectively, and is supported rotatably with respect to the frame 10. The lead screw 30 is coupled to an output shaft of the gear motor 20 and is rotated by the operation of the gear motor 20. Further, the guide shaft 50 extends in the Z direction between the upper flange portion 11 and the lower flange portion 12 of the frame 10. That is, the guide shaft 50 and the lead screw 30 extend in parallel to each other.
The movable member 40 includes: a nut portion 41 having a thread groove formed therein for engaging with the lead screw 30; and a sliding part 42 formed with a shaft hole through which the guide shaft 50 is inserted. The slide portion 42 is guided by a guide shaft 50 inserted through the shaft hole and slides on the guide shaft 50 in the Z direction.
Fig. 2 is an exploded perspective view of the gear motor 20 as viewed from above, and fig. 3 is an exploded perspective view of the gear motor 20 shown in fig. 2 as viewed from below. As shown in fig. 2 and 3, the gear motor 20 includes a motor 21, which is, for example, a stepping motor, and a planetary gear reduction unit 22 disposed between the motor 21 and the lead screw 30. The motor 21 has a motor shaft 24 extending upward from the center of the upper surface thereof, and the planetary gear reduction unit 22 reduces the rotation of the motor shaft 24 as an input shaft and transmits the reduced rotation to a lead screw 30 as an output shaft.
The planetary gear reduction unit 22 has a gear case 23 disposed above the motor 21. The gear case 23 includes: a bearing holding portion 231 that holds the lower bearing 32; a cylindrical portion 233 having an internal gear 232 on an inner peripheral surface thereof; and a rectangular plate-like portion 234 located between the bearing holding portion 231 and the cylindrical portion 233. In the present embodiment, a planetary gear mechanism of two stages, up and down, is housed inside the gear case 23.
As shown in fig. 2 and 3, the planetary gear reduction unit 22 has a flange 80 attached to an end surface of the motor 21. A through hole 81 is formed in the center of the flange 80, and the motor shaft 24 of the motor 21 penetrates the center of the through hole 81. In addition, the planetary gear reduction device 22 includes: a pinion 25 (1 st sun gear) fixed to the motor shaft 24 and rotating together with the motor shaft 24; three planetary gears 61 (1 st planetary gear) disposed around the pinion 25 and meshing with the pinion 25; a carrier 71 (1 st carrier) that rotatably holds the planetary gears 61; three planetary gears 62 (2 nd planetary gear) disposed around the pinion 713 (2 nd sun gear) formed on the carrier 71 and meshing with the pinion 713; and a carrier 72 (2 nd carrier) that rotatably supports the planetary gears 62. Fig. 4 is a partial sectional view of the gear motor 20 cut by a plane including one central axis of the motor shaft 24 and the planetary gear 61.
The carrier 71 has: a carrier main body 711; and three solid shaft portions 712 (1 st solid shaft portion) extending downward from the carrier body 711. The pinion gear 713 is disposed on the upper surface of the carrier body 711 coaxially with the motor shaft 24. As shown in fig. 2, a bearing recess 612 (1 st bearing recess) that receives the solid shaft portion 712 of the carrier 71 is formed on the upper side of the planetary gear 61. By inserting the solid shaft portion 712 of the carrier 71 into the bearing recess portion 612, each of the three planetary gears 61 is supported rotatably with respect to the carrier 71.
The carrier 72 has: a carrier main body 721; three solid shaft portions 722 (2 nd solid shaft portion) extending downward from the carrier main body 721; and a shaft coupling portion 723 coupled to a lower end portion of the screw shaft 30 as an output shaft. As shown in fig. 2, a bearing recess 622 (the 2 nd bearing recess) that receives the solid shaft portion 722 of the carrier 72 is formed on the upper side of the planetary gear 62. By inserting the solid shaft portion 722 of the carrier 72 into the bearing recess 622, the three planetary gears 62 are held rotatably with respect to the carrier 72.
In such a configuration, the first-stage (lower-stage) planetary gear mechanism is composed of a pinion gear 25 coupled to the motor shaft 24, three planetary gears 61 arranged around the pinion gear 25, an internal gear 232 formed in a cylindrical portion 233 of the gear case 23, and a carrier 71 holding the planetary gears 61 rotatably. The second-stage (upper-stage) planetary gear mechanism is composed of pinion gears 713 formed on the carrier 71, three planetary gears 62 arranged around the pinion gears 713, an internal gear 232 formed on the cylindrical portion 233 of the gear case 23, and a carrier 72 that rotatably holds the planetary gears 62.
According to such a configuration, when the motor shaft 24 is rotated by driving the motor 21, the pinion gear 25 rotates, and therefore the three planetary gears 61 meshing with the pinion gear 25 rotate (rotate) around the solid shaft portion 712 of the carrier 71. In addition, since the planetary gears 61 are engaged with the internal gear 232 formed in the gear case 23 on the opposite side of the pinion gear 25, the planetary gears 61 revolve around the pinion gear 25 along the internal gear 232. The carrier 71 rotates around the central axis line in accordance with the revolution of the planetary gears 61.
When the carrier 71 rotates, the pinion gears 713 also rotate, and therefore the three planetary gears 62 meshing with the pinion gears 713 rotate (rotate) about the solid shaft portion 722 of the carrier 72. In addition, since the planetary gears 62 are engaged with the internal gear 232 formed in the gear case 23 on the opposite side of the pinion gear 713, the planetary gears 62 revolve around the pinion gear 713 along the internal gear 232. The carrier 72 rotates around the central axis in accordance with the revolution of the planetary gears 62. As a result, the lead screw 30 connected to the shaft connecting portion 723 of the carrier 72 rotates. As described above, since the planetary gear reduction device 22 of the present embodiment has a two-stage planetary gear mechanism, the rotation of the motor shaft 24 of the motor 21 is reduced at a large reduction ratio, and the torque of the lead screw 30 can be increased.
The planetary gears 61 and 62 of the present embodiment are made of resin, and are manufactured by injection molding, for example. As shown in fig. 3, a gate portion 614 (1 st gate portion) generated at the time of molding is formed to protrude downward from a lower surface 615 of the planetary gear 61 below the planetary gear 61. As described above, in the present embodiment, since the gate portion 614 of the planetary gear 61 made of resin is formed to protrude below the planetary gear 61, it is not necessary to form a recess portion in the shaft portion of the carrier 71 as in the conventional planetary gear reduction device, and the solid shaft portion 712 of the carrier 71 can be received in the bearing recess portion 612 of the planetary gear 61. Therefore, even if the shaft portion of the carrier 71 is made thin, the strength of the shaft portion of the carrier 71 can be maintained. As a result, the size of the carrier 71 can be reduced, and the entire planetary gear reduction unit 22 can be downsized. The gate portion 614 of the planetary gear 61 is preferably located on the central axis of the planetary gear 61. If the gate portion 614 is disposed on the central axis of the planetary gear 61, the heat shrinkage during molding can be made uniform over the entire planetary gear 61, and the dimensional accuracy of the planetary gear 61 can be improved.
Similarly, a gate portion 624 (2 nd gate portion) formed at the time of molding is formed to protrude downward from a lower surface 625 of the planetary gear 62 on the lower side of the planetary gear 62. As described above, in the present embodiment, since the gate portions 624 of the planetary gears 62 made of resin are formed so as to protrude below the planetary gears 62, it is not necessary to form a recess in the shaft portion of the carrier 72 as in the conventional planetary gear reduction device, and the solid shaft portion 722 of the carrier 72 can be received in the bearing recess 622 of the planetary gear 62. Therefore, even if the shaft portion of the carrier 72 is thinned, the strength of the shaft portion of the carrier 72 can be maintained. As a result, the size of the carrier 72 can be reduced, and the size of the entire planetary gear reduction unit 22 can be reduced. The gate portion 624 of the planetary gear 62 is preferably located on the central axis of the planetary gear 62. If the gate portion 624 is disposed on the central axis of the planetary gear 62, the heat shrinkage during molding can be made uniform over the entire planetary gear 62, and the dimensional accuracy of the planetary gear 62 can be improved.
As shown in fig. 2 and 3, an annular wall 85 projecting upward is formed near the outer edge of the flange 80. As shown in fig. 4, the annular wall 85 of the flange 80 abuts against a part of the lower surface 615 (the 1 st abutment surface) of each of the planetary gears 61, and when the planetary gears 61 rotate, a part of the lower surfaces 615 of the planetary gears 61 slide on the annular wall 85 of the flange 80. A space S1 is formed between the planetary gear 61 and the flange 80 radially inward of the annular wall 85 of the flange 80, and the gate portion 614 of the planetary gear 61 is accommodated in this space S1. Therefore, when the planetary gear 61 rotates, the gate portion 614 of the planetary gear 61 can move in the space S1 without interfering with the flange 80. That is, the space S1 radially inside the annular wall 85 of the flange 80 serves as the 1 st gate portion moving space for moving the gate portions 614 of the planetary gears 61 between the planetary gears 61 and the flange 80.
In this way, in the present embodiment, since the gate portion 614 of the planetary gear 61 is configured to move in the space S1 between the planetary gear 61 and the flange 80, the gate portion 614 of the planetary gear 61 can move in the space S1 without interfering with the flange 80 when the planetary gear 61 rotates. Further, when the planetary gear 61 rotates, only a part of the lower surface 615 of the planetary gear 61 comes into sliding contact with the annular wall 85 of the flange 80, and therefore the contact area between the planetary gear 61 and the flange 80 becomes small. Therefore, the frictional resistance generated when the planetary gear 61 rotates can be reduced.
Further, a disk-shaped contact portion 715 projecting upward is formed in the carrier body 711 of the carrier 71. As shown in fig. 4, the contact portion 715 of the carrier 71 contacts a portion of the lower surface 625 (the 2 nd contact surface) of each of the planetary gears 62, and when the planetary gears 62 rotate, a portion of the lower surface 625 of the planetary gear 62 slides on the contact portion 715 of the carrier 71. A space S2 is formed between the planetary gear 62 and the carrier 71 radially outward of the contact portion 715 of the carrier 71, and the gate portion 624 of the planetary gear 62 is accommodated in this space S2. Therefore, when the planetary gear 62 rotates, the gate portion 624 of the planetary gear 62 can move in the space S2 without interfering with the carrier 71. That is, the radially outer space S2 of the contact portion 715 of the carrier 71 serves as a 2 nd gate portion movement space for moving the gate portion 624 of the planetary gear 62 between the planetary gear 62 and the carrier 71.
In this way, in the present embodiment, the gate portion 624 of the planetary gear 62 is configured to move in the space S2 between the planetary gear 62 and the carrier 71, and therefore, when the planetary gear 62 rotates, the gate portion 624 of the planetary gear 62 can move in the space S2 without interfering with the carrier 71. When the planetary gears 62 rotate, only a part of the lower surfaces 625 of the planetary gears 62 slide in contact with the contact portions 715 of the carrier 71, and therefore the contact area between the planetary gears 62 and the carrier 71 is reduced. Therefore, the frictional resistance generated when the planetary gear 62 rotates can be reduced.
The planetary gear reduction unit 22 of the above embodiment includes a two-stage planetary gear mechanism, but the number of planetary gear mechanisms included in the planetary gear reduction unit 22 is not limited to this, and a single-stage planetary gear mechanism may be included, or three or more-stage planetary gear mechanisms may be included. The number of planetary gears included in each planetary gear mechanism is not limited to the number shown in the drawings.
The terms "upper", "lower" and other terms used in the present specification relate to the illustrated embodiments, and are changed depending on the relative positional relationship of the devices.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that the present invention can be implemented in various different forms within the scope of the technical idea thereof.
Claims (8)
1. A planetary gear reduction device which reduces the rotation of an input shaft and transmits the reduced rotation to an output shaft,
the planetary gear reduction device includes:
a 1 st sun gear coupled to the input shaft;
a 1 st planetary gear made of resin, meshed with the 1 st sun gear and rotating with the rotation of the 1 st sun gear;
a 1 st carrier that is rotatable coaxially with the 1 st sun gear and holds the 1 st planetary gear rotatably; and
an internal gear that holds the 1 st planetary gear so as to be capable of revolving around the 1 st sun gear,
the 1 st carrier has a 1 st solid shaft portion extending coaxially with the 1 st planetary gear,
a 1 st bearing recess portion that receives the 1 st solid shaft portion of the 1 st carrier is formed on the output shaft side of the 1 st planetary gear,
a 1 st gate portion protruding toward the input shaft is formed on the 1 st planetary gear on the input shaft side.
2. A planetary gear reduction unit according to claim 1,
the 1 st gate portion of the 1 st planetary gear is located on a central axis of the 1 st planetary gear.
3. A planetary gear reduction unit according to claim 1,
the planetary gear reduction device further includes a flange having an annular wall abutting against a part of a 1 st abutting surface on the input shaft side of the 1 st planetary gear,
a 1 st gate portion moving space for moving the 1 st gate portion of the 1 st planetary gear between the 1 st planetary gear and the flange is defined radially inside the annular wall of the flange.
4. A planetary gear reduction unit according to claim 1,
the 1 st carrier has a 2 nd sun gear disposed coaxially with the 1 st sun gear,
the planetary gear reduction device further has:
a 2 nd planetary gear made of resin, meshed with the 2 nd sun gear and rotating with the rotation of the 2 nd sun gear; and
a 2 nd carrier that is rotatable coaxially with the 2 nd sun gear and holds the 2 nd planetary gear rotatably,
the internal gear holds the 2 nd planetary gear so as to be capable of revolving around the 2 nd sun gear,
the 2 nd carrier has a 2 nd solid shaft portion extending coaxially with the 2 nd planetary gear,
a 2 nd bearing recess portion that receives the 2 nd solid shaft portion of the 2 nd carrier is formed on the output shaft side of the 2 nd planetary gear,
a 2 nd gate portion protruding toward the input shaft is formed on the input shaft side of the 2 nd planetary gear.
5. A planetary gear reduction unit according to claim 4,
the 2 nd gate portion of the 2 nd planetary gear is located on a central axis of the 2 nd planetary gear.
6. A planetary gear reduction unit according to claim 4,
the 1 st carrier has an abutting portion abutting against a part of a 2 nd abutting surface on the input shaft side of the 2 nd planetary gear,
a 2 nd gate moving space for moving the 2 nd gate of the 2 nd planetary gear between the 2 nd planetary gear and the 1 st carrier is defined outside in a radial direction of the abutting portion of the 1 st carrier.
7. A gear motor is characterized in that the gear motor is provided with a gear motor,
the gear motor has:
the planetary gear reduction unit of claim 1; and
a motor having a motor shaft coupled to the 1 st sun gear of the planetary gear reduction unit.
8. A driving device for moving an object to be driven in an axial direction,
the driving device comprises:
the gear motor of claim 7;
a frame to which the gear motor is mounted;
a lead screw extending in the axial direction and rotated by the gear motor; and
and a movable member having a nut portion screwed with the lead screw.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-144105 | 2019-08-06 | ||
| JP2019144105A JP7285726B2 (en) | 2019-08-06 | 2019-08-06 | planetary gear reducer, geared motor, and drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213298712U true CN213298712U (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021598330.2U Active CN213298712U (en) | 2019-08-06 | 2020-08-04 | Planetary gear reduction device, gear motor, and drive device |
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| Country | Link |
|---|---|
| JP (1) | JP7285726B2 (en) |
| CN (1) | CN213298712U (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2787741B2 (en) * | 1992-03-27 | 1998-08-20 | 狭山精密工業株式会社 | Planetary gear transmission |
| JP2922476B2 (en) * | 1997-02-17 | 1999-07-26 | 庄司 井学 | Planetary gear without sub-carrier panel |
| JP2000065165A (en) * | 1998-08-20 | 2000-03-03 | Namiki Precision Jewel Co Ltd | Planetary gear speed reducer and assembling method therefor |
| JP4311613B2 (en) * | 2002-12-18 | 2009-08-12 | 株式会社エンプラス | Planetary gear reducer |
| JP5272596B2 (en) | 2008-09-09 | 2013-08-28 | 日本電気株式会社 | Storage device and control method thereof |
| JP6010101B2 (en) * | 2014-12-25 | 2016-10-19 | 日本電産コパル株式会社 | Reducer, geared motor, and electronic device |
-
2019
- 2019-08-06 JP JP2019144105A patent/JP7285726B2/en active Active
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2020
- 2020-08-04 CN CN202021598330.2U patent/CN213298712U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021025590A (en) | 2021-02-22 |
| JP7285726B2 (en) | 2023-06-02 |
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