Planetary gear mechanism, geared motor and racing module

Abstract

To provide a planetary gear mechanism which can stabilize an arrangement of a planetary gear without receiving an influence of an external force, a geared motor and a racing module.SOLUTION: A planetary gear mechanism 1 has: a sun gear 2 attached to a motor rotation shaft Sm and rotating around a center axis C which extends up and down; a fixed inner tooth gear 3 located outside the sun gear 2 in a radial direction; a plurality of planetary gears 4 located outside the suggestion 2 in the radial direction, and inside the fixed inner tooth gear 3 in the radial direction, and engaged with the sun gear 2 and the fixed inner tooth gear 3; a movable inner tooth gear 5 located at an upper side of the fixed inner tooth gear 3, and outside the plurality of planetary gear 4 in the radial direction, engaged with the plurality of planetary gears 4, and rotating around the center axis; and a carrier part 6 for holding upper faces and lower faces of the plurality of planetary gears 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a planetary gear mechanism, a geared motor, and a racing module. [Background technology]

[0002] Conventionally, planetary gear mechanisms have been widely used to reduce the speed of a rotating shaft. For example, a planetary gear mechanism includes a sun gear, a plurality of planetary gears meshing with the sun gear, a carrier supporting the plurality of planetary gears arranged around the sun gear, and an output shaft fixed to the carrier (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-173708 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology, only one end side of the planetary gear in the rotational axis direction is supported by the carrier, which makes it susceptible to the effects of external forces and makes it difficult to stabilize the arrangement of the planetary gear.

[0005] In view of the above, an object of the present disclosure is to provide a planetary gear mechanism, a geared motor, and a racing module that are capable of stabilizing the arrangement of planetary gears without being affected by external forces. [Means for solving the problem]

[0006] An exemplary planetary gear mechanism of the present disclosure includes a sun gear, a fixed internal gear, a plurality of planetary gears, and A motor having a movable internal gear and a carrier portion, and rotating around a central axis extending in the vertical direction. The sun gear rotates the motor. The fixed internal gear is attached to a shaft and rotates about the central axis. The planetary gears are located radially outward of the sun gear and radially outward of the fixed gear. The movable gear is located radially inside the internal gear and meshes with the sun gear and the fixed internal gear. The movable internal gear is located above the fixed internal gear and radially outside the planetary gears. The carrier portion is engaged with the planetary gears and rotates about the central axis. The upper and lower surfaces of a plurality of planetary gears are held. The carrier portion has two carrier holding members of the same shape that individually hold the upper surfaces of the planetary gears and the lower surfaces of the planetary gears and face each other in the vertical direction. The carrier holding member has a flat plate portion that extends in the radial direction facing the upper or lower surfaces of the planetary gears, a central hole that is located at the radial center of the flat plate portion and penetrates the flat plate portion in the vertical direction, and is positioned radially outside the central hole on the flat plate portion and arranged at equal angles in the circumferential direction. A plurality of gear support portions that individually support the plurality of planetary gears, a connection piece that is located between the plurality of gear support portions in the circumferential direction of the flat plate portion and extends in the vertical direction, and a connection receiving portion is arranged adjacent to the connection piece in the circumferential direction and is connected to the connection piece of the other carrier holding member that faces in the vertical direction. The connection piece in the vertical direction is located adjacent to the flat plate portion in the circumferential direction and between the plurality of gear support portions.

[0007] An exemplary geared motor of the present disclosure has a planetary gear mechanism having the above-described configuration.

[0008] An exemplary racing module of the present disclosure is a geared motor having the above configuration. The geared motor rotates the spool in both forward and reverse directions to wind the string around the spool and unwind it from the spool. Effect of the Invention

[0009] According to the exemplary planetary gear mechanism, geared motor, and racing module of the present disclosure, it is possible to stabilize the arrangement of the planetary gears without being affected by external forces. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a vertical cross-sectional view of a planetary gear mechanism according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of the planetary gear mechanism of FIG. [Diagram 3] FIG. 3 is a perspective view of a carrier portion and a planetary gear of the planetary gear mechanism according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is an exploded perspective view of the carrier portion and the planetary gear of FIG. [Diagram 5] FIG. 5 is a vertical cross-sectional view of the carrier portion and the planetary gear of FIG. [Figure 6] FIG. 6 is a top view of the planetary gear of FIG. [Figure 7] FIG. 7 is a perspective view of a carrier portion and a planetary gear of a planetary gear mechanism according to the second embodiment of the present disclosure. [Figure 8] 8 is an exploded perspective view of the carrier portion and the planetary gear of FIG. [Figure 9] FIG. 9 is a vertical cross-sectional view of the carrier portion and planetary gear of FIG. [Figure 10] FIG. 10 is a vertical sectional view of a modified planetary gear. [Figure 11] FIG. 11 is a perspective view of a geared motor according to one embodiment of the present disclosure. [Figure 12] FIG. 12 is a perspective view of a racing module according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments, and can be modified as desired within the scope of the technical concept of the present disclosure.

[0012] In this document, the direction in which the central axis of the sun gear of the planetary gear mechanism extends is simply referred to as the "axial direction," the direction perpendicular to the central axis of the sun gear is simply referred to as the "radial direction," and the direction along the arc centered on the central axis of the sun gear is simply referred to as the "circumferential direction."

[0013] For convenience of explanation, the shape and positional relationship of each part will be explained assuming that the axial direction is the "vertical direction" and that the vertical direction in Fig. 1 is the vertical direction of the planetary gear mechanism. Note that this definition of the vertical direction does not limit the orientation and positional relationship of the planetary gear mechanism when in use. For example, as shown in Figs. 11 and 12, when the planetary gear mechanism is combined with other devices such as a geared motor or a racing module, the axial direction of the planetary gear mechanism may extend horizontally.

[0014] In this specification, a cross section parallel to the axial direction (up-down direction) is called a "longitudinal cross section." In addition, the terms "parallel" and "orthogonal" used in this specification do not mean parallel or orthogonal in the strict sense, but include approximately parallel and approximately orthogonal.

[0015] <1. Planetary gear mechanism> <1-1. Overall configuration of planetary gear mechanism> Fig. 1 is a vertical cross-sectional view of a planetary gear mechanism 1 according to an embodiment of the present disclosure. Fig. 2 is a perspective view of the planetary gear mechanism 1 of Fig. 1. The planetary gear mechanism 1 reduces the speed of rotation input from a motor rotating shaft Sm that rotates around a central axis C extending in the vertical direction, and outputs the reduced speed to the outside. The planetary gear mechanism 1 has a sun gear 2, a fixed internal gear 3, a plurality of planetary gears 4, a movable internal gear 5, and a carrier portion 6.

[0016] The sun gear 2 is located at the lower part of the planetary gear mechanism 1 and at the radial center of the planetary gear mechanism 1. The rotation axis of the sun gear 2 is disposed along the central axis C. The sun gear 2 has a cylindrical shape extending along the central axis C, and has a plurality of teeth 2t juxtaposed on its outer periphery. The sun gear 2 is attached to the motor rotating shaft Sm and rotates around the central axis C.

[0017] The fixed internal gear 3 is located radially outside the sun gear 2. The fixed internal gear 3 has a cylindrical shape extending along the central axis C, and has a plurality of teeth 3t juxtaposed on its inner circumference. The inner diameter of the fixed internal gear 3 is larger than the outer diameter of the sun gear 2. The fixed internal gear 3 is fixed to a case (not shown) or the like that is arranged on the outer circumference.

[0018] The multiple planetary gears 4 are located radially outward of the sun gear 2 and radially inward of the fixed internal gear 3. In this embodiment, the planetary gear mechanism 1 has three planetary gears 4. The three planetary gears 4 are disposed at equal angles of 120 degrees in the circumferential direction about the central axis C and are held by a carrier portion 6.

[0019] In this embodiment, the planetary gear 4 has an upper gear 411 and a lower gear 412. The upper gear 411 is located at the top of the planetary gear 4. The lower gear 412 is located below the upper gear 411. The upper gear 411 and the lower gear 412 are connected in the vertical direction and configured as one unit. The upper gear 411 and the lower gear 412 both extend in the vertical direction parallel to the central axis C, and a plurality of teeth 411t, 412t are arranged side by side on the outer periphery. The upper gear 411 and the lower gear 412 have different outer diameters and different numbers of teeth. The planetary gear 4 may be configured as one gear without being divided into the upper gear 411 and the lower gear 412.

[0020] The multiple planetary gears 4 mesh with the sun gear 2 and the fixed internal gear 3. In particular, the lower gears 412 of the three planetary gears 4 mesh with the sun gear 2 and the fixed internal gear 3. The upper gears 411 of the three planetary gears 4 mesh with the movable internal gear 5.

[0021] The movable internal gear 5 is located above the fixed internal gear 3 and radially outside the multiple planetary gears 4. The movable internal gear 5 has a cylindrical shape extending along the central axis C, and multiple teeth 5t are arranged in parallel on its inner circumference. The movable internal gear 5 meshes with the multiple planetary gears 4 and rotates around the central axis C. The movable internal gear 5 has a ceiling portion 51 and an output shaft 52. The ceiling portion 51 closes the upper end of the cylinder with the multiple teeth 5t arranged in parallel on its inner circumference. The output shaft 52 is located on the upper surface 51a of the ceiling portion 51 and extends upward along the central axis C.

[0022] The carrier portion 6 has two carrier holding members 61. The two carrier holding members 61 individually face the upper and lower surfaces of the three planetary gears 4. The two carrier holding members 61 hold the three planetary gears 4 between each other in the up-down direction. That is, the carrier portion 6 holds the upper and lower surfaces of the multiple planetary gears 4.

[0023] The upper and lower surfaces of the three planetary gears 4 are held by the carrier portion 6, thereby making it possible to strengthen the assembled state of the three planetary gears 4. This makes it possible to stabilize the arrangement of the planetary gears 4 without being affected by external forces.

[0024] <1-2. Carrier portion and planetary gear (first embodiment)> Fig. 3 is a perspective view of the carrier portion 6 and the planetary gears 4 of the planetary gear mechanism 1 according to the first embodiment of the present disclosure. Fig. 4 is an exploded perspective view of the carrier portion 6 and the planetary gears 4 of Fig. 3. Fig. 5 is a vertical sectional view of the carrier portion 6 and the planetary gears 4 of Fig. 3. Fig. 6 is a top view of the planetary gears 4 of Fig. 3.

[0025] The carrier portion 6 has two identically shaped carrier holding members 61. The two identically shaped carrier holding members 61 individually hold the upper surfaces of the multiple planetary gears 4 and the lower surfaces of the multiple planetary gears 4, and face each other in the vertical direction. The carrier holding member 61 is formed of, for example, sheet metal. The carrier holding member 61 has a flat plate portion 611, a central hole 612, multiple gear support portions 613, a connection piece 614, and a connection receiving portion 615.

[0026] The flat plate portion 611 faces the upper or lower surfaces of the multiple planetary gears 4. The flat plate portion 611 expands in the radial direction about the central axis C. The flat plate portion 611 is formed in a substantially circular or substantially hexagonal shape when viewed from the top-bottom direction.

[0027] The central hole 612 is located at the radial center of the flat plate portion 611. The central hole 612 passes through the flat plate portion 611 in the up-down direction. The central hole 612 is formed in a circular shape when viewed from the up-down direction.

[0028] The multiple gear support portions 613 are located on the flat plate portion 611 radially outside the central hole 612. The number of gear support portions 613 provided is the same as the number of planetary gears 4. That is, in this embodiment, the carrier holding member 61 has three gear support portions 613. The three gear support portions 613 are disposed at equal angles of 120 degrees in the circumferential direction. The three gear support portions 613 face the three planetary gears 4 in the up-down direction, respectively. The gear support portion 613 has a support hole 613a that penetrates in the up-down direction. The multiple gear support portions 613 individually support the multiple planetary gears 4.

[0029] The connection pieces 614 are located on the radially outer edge of the flat plate portion 611. The connection pieces 614 are located between the multiple gear support portions 613 of the flat plate portion 611 in the circumferential direction. In other words, the connection pieces 614 are disposed between the three planetary gears 4 in the circumferential direction. That is, in this embodiment, each carrier holding member 61 has three connection pieces 614. The connection pieces 614 are formed in an elongated flat plate shape. The connection pieces 614 extend in the up-down direction toward the opposing other carrier holding member 61. The connection pieces 614 have a recess 614a at their tip portions that is recessed in the up-down direction.

[0030] The connection receiving portion 615 is located at the radial outer edge of the flat plate portion 611. The connection receiving portion 615 is adjacent to the connection piece 614 in the circumferential direction. The connection receiving portion 615 is located between the multiple gear support portions 613 of the flat plate portion 611 in the circumferential direction. In other words, the connection receiving portion 615 is disposed between each of the three planetary gears 4 in the circumferential direction. That is, in this embodiment, each carrier holding member 61 has three connection receiving portions 615. The connection receiving portion 615 has a convex portion 615a that protrudes radially outward. The connection receiving portion 615 is connected to the connection piece 614 of the other carrier holding member 61 that faces the other carrier holding member 61 in the vertical direction. In detail, the convex portion 615a of the connection receiving portion 615 is inserted into the concave portion 614a of the connection piece 614 and connected.

[0031] According to the above configuration, the plurality of planetary gears 4 can be held by the carrier holding member 61, which is one type of part, in the carrier portion 6. This makes it possible to reduce the number of types of parts used in the planetary gear mechanism 1.

[0032] A convex portion may be formed on the connection piece 614, and a concave portion may be formed on the connection receiving portion 615. The concave portion 614a and the convex portion 615a are both, for example, rectangular when viewed from the top-bottom direction, but may be other shapes such as substantially circular. The connection piece 614 and the connection receiving portion 615 may be disposed radially inward from the radial outer edge portion of the flat plate portion 611.

[0033] The carrier part 6 has an upper convex part 616. The upper convex part 616 is disposed on an upper surface 6a of the carrier part 6. More specifically, the upper convex part 616 is disposed on an upper surface of the flat plate part 611 of the upper carrier holding member 61. The upper convex part 616 is disposed on the periphery of the central hole 612, and is formed in an annular shape. The upper convex part 616 is formed, for example, by burring a sheet metal member.

[0034] The ceiling portion 51 of the movable internal gear 5 is located above the carrier portion 6. That is, the upper surface 6a of the carrier portion 6 faces the ceiling portion 51 of the movable internal gear 5 in the vertical direction. The upper convex portion 616 faces a part of the lower surface 51b of the ceiling portion 51 of the movable internal gear 5 in the vertical direction, and protrudes upward toward the lower surface 51b of the ceiling portion 51.

[0035] According to the above configuration, it is possible to reduce the contact area between the carrier part 6 and the movable internal gear 5. This makes it possible to reduce sliding friction between the carrier part 6 and the movable internal gear 5, allowing them to rotate smoothly, and suppressing wear and generation of frictional heat.

[0036] The carrier portion 6 has an inner convex portion 617. The inner convex portion 617 is disposed on the lower surface of the flat plate portion 611 of the upper carrier holding member 61 and on the upper surface of the flat plate portion 611 of the lower carrier holding member 61. The inner convex portion 617 is disposed on the periphery of the support hole 613a of each of the three gear support portions 613 and is formed in an annular shape. The inner convex portion 617 is formed, for example, by burring a sheet metal member.

[0037] The upper inner convex portion 617 of the carrier portion 6 faces the upper surfaces of the multiple planetary gears 4 in the vertical direction, and protrudes downward toward the upper surfaces of the multiple planetary gears 4. The lower inner convex portion 617 of the carrier portion 6 faces the lower surfaces of the multiple planetary gears 4 in the vertical direction, and protrudes upward toward the lower surfaces of the multiple planetary gears 4. With this configuration, it is possible to reduce the contact area between the carrier portion 6 and the planetary gears 4. This makes it possible to reduce the sliding friction between the carrier portion 6 and the planetary gears 4, allowing them to rotate smoothly, and suppressing the generation of wear and frictional heat.

[0038] The planetary gear 4 has a gear portion 41 and a rotating shaft portion 42. The gear portion 41 extends in the vertical direction parallel to the central axis C, and is divided into an upper gear 411 and a lower gear 412 in the vertical direction. A plurality of teeth 411t, 412t are arranged in parallel on the outer periphery of the gear portion 41. The rotating shaft portion 42 is arranged along the central axis of the gear portion 41. The rotating shaft portion 42 protrudes in the vertical direction from the upper and lower surfaces of the gear portion 41. The rotating shaft portion 42 is inserted into a support hole 613a of a gear support portion 613 of the carrier holding member 61. By configuring the gear portion 41 and the rotating shaft portion 42 as an integral unit, it is possible to improve the positional accuracy of the rotating shaft portion 42 relative to the gear portion 41.

[0039] As shown in FIG. 6, the planetary gear 4 has an in-phase portion 43 and an index portion 431.

[0040] The in-phase portion 43 is a portion where the position of one tooth 411t of the upper gear 411 and the position of one tooth 412t of the lower gear 412 coincide in the circumferential direction. In this embodiment, the planetary gear 4 has three in-phase portions 43. The three in-phase portions 43 are disposed at equal angles of 120 degrees in the circumferential direction around the rotation shaft portion 42 of the planetary gear 4.

[0041] The indicator portion 431 is disposed on the upper and lower surfaces of the in-phase portion 43. The indicator portion 431 is a mark indicating that the position of the indicator portion 431 is the in-phase portion 43, and is formed as a recess in this embodiment. The indicator portion 431 may be a protrusion, an engraved mark, or the like.

[0042] This configuration makes it easy to align the planetary gear 4 with respect to the fixed internal gear 3 and the movable internal gear 5. Therefore, the workability of assembling the planetary gear mechanism 1 can be improved.

[0043] The gear portion 41 and the rotating shaft portion 42 are made of a metal or a metal alloy. This configuration makes it possible to increase the rigidity and life of the planetary gear 4.

[0044] The outer surface of the planetary gear 4 is fluorine-coated. With this configuration, it is possible to improve the wear resistance and low friction of the planetary gear 4.

[0045] Furthermore, lubricant is applied to the contact areas of the sun gear 2, the fixed internal gear 3, the planetary gear 4, the movable internal gear 5, and the carrier part 6. With this configuration, it is possible to improve the wear resistance and low friction of each gear.

[0046] <1-3. Carrier portion and planetary gear (second embodiment)> Fig. 7 is a perspective view of the carrier portion 6 and the planetary gears 4 of the planetary gear mechanism 1 according to the second embodiment of the present disclosure. Fig. 8 is an exploded perspective view of the carrier portion 6 and the planetary gears 4 of Fig. 7. Fig. 9 is a vertical cross-sectional view of the carrier portion 6 and the planetary gears 4 of Fig. 7.

[0047] The carrier unit 6 has a carrier lid member 62 and a carrier base member 63. The carrier lid member 62 holds one of the upper and lower surfaces of the multiple planetary gears 4. The carrier base member 63 faces the carrier lid member 62 in the vertical direction and holds the other of the upper and lower surfaces of the multiple planetary gears 4. In this embodiment, the carrier lid member 62 holds the upper surfaces of the multiple planetary gears 4. In this embodiment, the carrier base member 63 holds the lower surfaces of the multiple planetary gears 4. The carrier lid member 62 and the carrier base member 63 are formed, for example, from sheet metal.

[0048] The carrier lid member 62 has a lid flat plate portion 621, a lid central hole 622, a plurality of lid gear support portions 623, and a connection receiving portion 625.

[0049] The cover flat portion 621 faces the upper surfaces of the multiple planetary gears 4. The cover flat portion 621 expands in the radial direction about the central axis C. The cover flat portion 621 is formed in a circular shape when viewed from the top-bottom direction.

[0050] The lid central hole 622 is located at the radial center of the lid flat plate portion 621. The lid central hole 622 passes through the lid flat plate portion 621 in the up-down direction. The lid central hole 622 is formed in a circular shape when viewed from the up-down direction.

[0051] The multiple lid gear support parts 623 are located on the lid flat plate part 621 radially outside the lid central hole 622. The number of lid gear support parts 623 is the same as the number of planetary gears 4. That is, in this embodiment, the carrier lid member 62 has three lid gear support parts 623. The three lid gear support parts 623 are arranged at equal angles of 120 degrees in the circumferential direction. The three lid gear support parts 623 face the three planetary gears 4 in the up-down direction, respectively. The lid gear support part 623 has a support hole 623a that penetrates in the up-down direction. The three lid gear support parts 623 individually support the three planetary gears 4.

[0052] The connection receiving portions 625 are located radially outside the lid central hole 622 of the lid flat plate portion 621. The connection receiving portions 625 are located between the multiple lid gear support portions 623 of the lid flat plate portion 621 in the circumferential direction. In other words, the connection receiving portions 625 are disposed between the three planetary gears 4 in the circumferential direction. That is, in this embodiment, the carrier lid member 62 has three connection receiving portions 625. The connection receiving portions 625 have hole portions 625a that penetrate the lid flat plate portion 621 in the up-down direction. The connection receiving portions 625 are connected to the carrier base members 63 that face each other in the up-down direction.

[0053] The carrier base member 63 has a base flat plate portion 631 , a base central hole 632 , a plurality of base gear support portions 633 , and a connecting piece 634 .

[0054] The base flat plate portion 631 faces the lower surfaces of the multiple planetary gears 4. The base flat plate portion 631 extends in the radial direction with the central axis C as the center.

[0055] The base central hole 632 is located at the radial center of the base flat plate portion 631. The base central hole 632 passes through the base flat plate portion 631 in the up-down direction. The base central hole 632 is formed in a circular shape when viewed from the up-down direction.

[0056] The multiple base gear support portions 633 are located radially outside the base central hole 632 on the base flat plate portion 631. The number of base gear support portions 633 is the same as the number of planetary gears 4. That is, in this embodiment, the carrier base member 63 has three base gear support portions 633. The three base gear support portions 633 are arranged at equal angles of 120 degrees in the circumferential direction. The three base gear support portions 633 face the three planetary gears 4 in the up-down direction, respectively. The base gear support portion 633 has a support hole 633a that penetrates in the up-down direction. The three base gear support portions 633 support the three planetary gears 4 individually.

[0057] The connection piece 634 is located at the radial outer edge of the base plate portion 631. The connection piece 634 is located between the multiple base gear support parts 633 of the base plate portion 631 in the circumferential direction. In other words, the connection piece 634 is disposed between each of the three planetary gears 4 in the circumferential direction. That is, in this embodiment, the carrier base member 63 has three connection pieces 634. The connection piece 634 is formed in a long and thin plate shape. The connection piece 634 extends in the vertical direction toward the carrier lid member 62 facing in the vertical direction. The connection piece 634 has a protrusion 634a protruding upward at the tip. The connection piece 634 is connected to the connection receiving part 625 of the carrier lid member 62. In detail, the protrusion 634a of the connection piece 634 of the carrier base member 63 is inserted into the hole part 625a of the connection receiving part 625 of the carrier lid member 62 and connected.

[0058] According to the above-mentioned configuration, it is possible to reduce the number of connection points between the carrier lid member 62 and the carrier base member 63 that constitute the carrier part 6. This makes it possible to increase the strength of the carrier part 6.

[0059] A convex portion may be formed on the connection receiving portion 625, and a concave portion may be formed on the connection piece 634. The hole portion 625a and the convex portion 634a are both, for example, rectangular when viewed from the top-bottom direction, but may be other shapes such as circular. The connection receiving portion 625 may be formed on the radial outer edge portion of the cover flat plate portion 621, and the connection piece 634 may be disposed radially inward from the radial outer edge portion of the base flat plate portion 631.

[0060] The carrier part 6 has an upper convex part 626. The upper convex part 626 is disposed on the upper surface 6a of the carrier part 6. More specifically, the upper convex part 626 is disposed on the upper surface of the lid flat plate part 621 of the carrier lid member 62. The upper convex part 626 is disposed on the periphery of the lid central hole 622 and is formed in an annular shape. The upper convex part 626 is formed, for example, by burring a sheet metal member.

[0061] 9, an upper end of the connection piece 634 of the carrier platform member 63 protrudes upward from the upper surface 6a of the carrier part 6. In detail, an upper end of the convex part 634a of the connection piece 634 of the carrier platform member 63 protrudes upward from the upper surface of the lid flat plate part 621 of the carrier lid member 62. Note that the height H1 from the upper surface 6a of the carrier part 6 to the upper end of the connection piece 634 is lower than the height H2 from the upper surface 6a of the carrier part 6 to the upper end of the upper convex part 626.

[0062] According to the above configuration, it is possible to reduce the number of contact points between the carrier part 6 and the movable internal gear 5. This allows the carrier part 6 and the movable internal gear 5 to rotate smoothly, and makes it possible to suppress the generation of wear and frictional heat.

[0063] In the first embodiment, the upper end of the connection piece 614 extending upward from the lower carrier holding member 61 may protrude upward from the upper surface of the flat plate portion 611 of the upper carrier holding member 61. In this case as well, the height from the upper surface 6a of the carrier part 6 to the upper end of the connection piece 614 is lower than the height from the upper surface 6a of the carrier part 6 to the upper end of the upper convex part 616.

[0064] The carrier portion 6 has inner convex portions 627, 637. The inner convex portion 627 is disposed on the lower surface of the flat plate portion 621 of the carrier lid member 62. The inner convex portion 627 is disposed on the periphery of the support hole 623a of each of the three gear support portions 623, and is formed in an annular shape. The inner convex portion 637 is disposed on the upper surface of the flat plate portion 631 of the carrier base member 63. The inner convex portion 637 is disposed on the periphery of the support hole 633a of each of the three gear support portions 633, and is formed in an annular shape. The inner convex portions 627, 637 are formed, for example, by burring a sheet metal member.

[0065] The inner convex portion 627 faces the upper surfaces of the multiple planetary gears 4 in the vertical direction, and protrudes downward toward the upper surfaces of the multiple planetary gears 4. The inner convex portion 637 faces the lower surfaces of the multiple planetary gears 4 in the vertical direction, and protrudes upward toward the lower surfaces of the multiple planetary gears 4. With this configuration, it is possible to reduce the contact area between the carrier portion 6 and the planetary gears 4. This makes it possible to reduce the sliding friction between the carrier portion 6 and the planetary gears 4, allowing them to rotate smoothly, and suppressing the generation of wear and frictional heat.

[0066] <1-3.Modified Planetary Gear> 10 is a vertical cross-sectional view of a modified planetary gear 7. The modified planetary gear 7 has a gear portion 71 and a rotating shaft portion 72. The gear portion 71 is divided into an upper gear 711 and a lower gear 712 in the vertical direction. The rotating shaft portion 72 penetrates the gear portion 71 from the upper surface side to the lower surface side. The gear portion 71 and the rotating shaft portion 72 are formed as different members and are coupled together. The gear portion 71 and the rotating shaft portion 72 may be directly coupled together, for example, by press fitting, or indirectly coupled together, for example, by adhesion.

[0067] For example, the gear portion 71 and the rotating shaft portion 72 are made of different metals or metal alloys. With this configuration, the materials of the gear portion 71 and the rotating shaft portion 72 can be changed depending on the application of the planetary gear mechanism 1.

[0068] For example, the gear portion 71 is made of resin, and the rotating shaft portion 72 is made of metal or a metal alloy. With this configuration, it is possible to improve the wear resistance and low friction of the gear portion 71.

[0069] The rotating shaft portion 72 is in contact with the gear portion 71 between the upper and lower surfaces of the gear portion 71. The rotating shaft portion 72 protrudes from the gear portion 71 and exposes its circumferential surface above the upper surface and below the lower surface of the gear portion 71. The surface roughness of at least a part of a contact region 72c of the rotating shaft portion 72 with the gear portion 71 is greater than the surface roughness of an exposed region 72e of the rotating shaft portion 72 with respect to the gear portion 71. This configuration can increase the bonding strength between the gear portion 71 and the rotating shaft portion 72.

[0070] <2. Geared motor> Fig. 11 is a perspective view of a geared motor 100 according to an embodiment of the present disclosure. The geared motor 100 has the planetary gear mechanism 1 configured as described above. The geared motor 100 further has a motor 101 and a worm 102. The planetary gear mechanism 1 has a case 1a. The sun gear 2, the fixed internal gear 3, the multiple planetary gears 4, the movable internal gear 5, and the carrier portion 6 shown in Fig. 1 are housed in the case 1a.

[0071] The sun gear 2 (see FIG. 1) of the planetary gear mechanism 1 is attached to a rotating shaft (not shown) of a motor 101 extending toward the planetary gear mechanism 1. The output shaft 52 (see FIG. 1) of the movable internal gear 5 of the planetary gear mechanism 1 extends toward and is connected to the worm 102. The planetary gear mechanism 1 reduces the speed of rotation input from the rotating shaft of the motor 101 rotating about the central axis C1 and outputs the reduced speed to the worm 102. The geared motor 100 rotates the worm 102 about the central axis C1.

[0072] According to the above configuration, it is possible to stabilize the arrangement of the planetary gears 4 in the geared motor 100. Therefore, it is possible to improve the deceleration performance of the motor 101.

[0073] <3. Racing module> 12 is a perspective view of a racing module 200 according to an embodiment of the present disclosure. The racing module 200 has the geared motor 100 configured as described above. That is, the racing module 200 has the planetary gear mechanism 1 configured as described above. Furthermore, the racing module 200 includes a case 201, a bearing 202, a battery 203, a control unit 204, a worm wheel 205, and a spool 206.

[0074] The case 201 accommodates therein the geared motor 100, a bearing 202, a battery 203, a control unit 204, and a worm wheel 205. The geared motor 100 is supported by the case 201 and the bearing 202. The worm 102 is rotatably supported by the bearing 202.

[0075] The motor 101 is electrically connected to a battery 203 and a control unit 204. The motor 101 receives power from the battery 203 and rotates a rotating shaft (not shown). The motor 101 is also controlled by the control unit 204. The geared motor 100 rotates the worm 102 around a central axis C1 by the motor 101.

[0076] The worm wheel 205 is connected to the worm 102. The worm wheel 205 rotates around a central axis C2 perpendicular to the central axis C1 of the worm 102. The spool 206 is connected coaxially to the worm wheel 205. That is, the spool 206 is rotated around the central axis C2 together with the worm wheel 205 by the geared motor 100. The geared motor 100 rotates the spool 206 in both forward and reverse directions relative to the central axis C2. A string (not shown) is wound around the spool 206.

[0077] The racing module 200 can wind the string around the spool 206 and unwind it from the spool 206 by rotating the spool 206 in both forward and reverse directions using the geared motor 100.

[0078] According to the above configuration, in the racing module 200, the arrangement of the planetary gears 4 can be stabilized, and the deceleration performance of the motor 101 can be improved. Therefore, the operation of winding the string material onto the spool 206 and unwinding it from the spool 206 can be stabilized.

[0079] <4.Other> Although the embodiments of the present disclosure have been described above, the scope of the present disclosure is not limited thereto, and various modifications can be made without departing from the spirit of the invention. Furthermore, the above-described embodiments and their modifications can be combined in any suitable manner.

[0080] For example, the planetary gear mechanism 1 and the geared motor 100 are not limited to being mounted on a racing module, and may be mounted on various household electrical appliances, transportation equipment, medical equipment, office automation equipment, and the like. [Industrial Applicability]

[0081] The present disclosure can be used in, for example, an electric device having a motor connected to a reduction mechanism including a racing module. [Explanation of symbols]

[0082] 1 planetary gear mechanism, 1a case, 2 sun gear, 2t teeth, 3 fixed internal gear, 3t teeth, 4 planetary gear, 5 movable internal gear, 5t teeth, 6 carrier portion, 6a upper surface, 7 planetary gear, 41 gear portion, 42 rotating shaft portion, 43 same phase portion, 51 ceiling portion, 51a upper surface, 51b lower surface, 52 output shaft, 61 carrier holding member , 62 carrier cover member, 63 carrier base member, 71 gear portion, 72 rotating shaft portion, 72c contact area, 72e exposed area, 100 geared motor, 101 motor, 102 worm, 200 racing module, 201 case, 202 bearing, 203 battery, 204 control unit, 205 worm wheel, 206 spool, 4 11...upper gear, 411t...tooth, 412...lower gear, 412t...tooth, 431...index portion, 611...flat plate portion, 612...central hole, 613...gear support portion, 613a...support hole, 614...connection piece, 614a...recess, 615...connection receiving portion, 615a...convex portion, 616...upper convex portion, 617...inner convex portion, 621...lid flat plate portion, 622...lid central hole, 623...lid gear support portion, 623a...support hole, 625...connection receiving portion, 625a...hole portion, 626...upper convex portion, 627...inner convex portion, 631...base flat plate portion, 632...base central hole, 633...base gear support portion, 633a...support hole, 634...connection piece, 634a...convex portion, 637...inner convex portion, C...center axis, C1...center axis, C2...center axis, H1...height, H2...height, Sm...motor rotation shaft

Claims

1. A planetary gear mechanism that decelerates and outputs to the outside a rotation input from a motor shaft that rotates about a central axis extending in a vertical direction, A sun gear attached to the motor shaft and rotating around the central axis; a fixed internal gear located radially outside the sun gear; a plurality of planetary gears located radially outward of the sun gear and radially inward of the fixed internal gear, the planetary gears meshing with the sun gear and the fixed internal gear; a movable internal gear located above the fixed internal gear and radially outward of the planetary gears, meshing with the planetary gears and rotating around the central axis; a carrier portion that holds upper and lower surfaces of the plurality of planetary gears; having the carrier portion has two carrier holding members of the same shape that individually hold upper surfaces of the plurality of planetary gears and lower surfaces of the plurality of planetary gears and face each other in the vertical direction, The carrier holding member is a flat plate portion extending in a radial direction and facing an upper surface or a lower surface of the planetary gears; a central hole that is located at a radial center of the flat plate portion and penetrates the flat plate portion in a vertical direction; a plurality of gear support portions disposed on the flat plate portion radially outward from the central hole and spaced at equal angles in a circumferential direction, the gear support portions supporting the plurality of planetary gears individually; a connecting piece located between the plurality of gear support portions in the circumferential direction of the flat plate portion and extending in the up-down direction; A planetary gear mechanism in which the connection receiving portion is arranged adjacent to the connection piece in the circumferential direction and is connected to the connection piece of the other carrier holding member that faces it in the vertical direction, and the vertical connection piece is adjacent to the flat plate portion in the circumferential direction and positioned between the multiple gear support portions.

2. The movable internal gear has a ceiling portion located above the carrier portion, the carrier portion faces a part of a lower surface of the ceiling portion of the movable internal gear in the up-down direction, The planetary gear mechanism according to claim 1 , further comprising an upper convex portion that protrudes upward toward the lower surface of the ceiling portion.

3. The carrier portion is disposed on an upper surface of the carrier portion and has an upper convex portion extending upward, An upper end of the connection piece protrudes upward from an upper surface of the carrier part, The planetary gear mechanism according to claim 1 , wherein a height from the upper surface of the carrier portion to the upper end of the connecting piece is lower than a height from the upper surface of the carrier portion to the upper end of the upper convex portion.

4. A planetary gear mechanism as described in any of claims 1 to 3, wherein the carrier portion faces a portion of the upper and lower surfaces of the plurality of planetary gears in the vertical direction and has an inner convex portion protruding toward the upper and lower surfaces of the plurality of planetary gears.

5. The planetary gear is a gear portion having a plurality of teeth arranged in parallel on an outer periphery thereof; a rotation shaft portion disposed along a central axis of the gear portion and protruding in a vertical direction from an upper surface and a lower surface of the gear portion; 5. The planetary gear mechanism according to claim 1, further comprising:

6. A planetary gear mechanism as described in claim 5, wherein the gear portion and the rotating shaft portion are made of metal or metal alloy.

7. A planetary gear mechanism as described in claim 6, wherein the gear portion and the rotating shaft portion are made of different metals or metal alloys.

8. A planetary gear mechanism as described in claim 6 or claim 7, wherein the outer surface of the planetary gear is subjected to a fluorine coating treatment.

9. A planetary gear mechanism as described in claim 5, wherein the gear portion is made of resin, and the rotating shaft portion is made of metal or a metal alloy.

10. The rotating shaft portion penetrates from the upper surface side to the lower surface side of the gear portion, The planetary gear mechanism according to claim 9 , wherein a surface roughness of at least a part of a contact area of ​​the rotating shaft portion with the gear portion is greater than a surface roughness of a region of the rotating shaft portion exposed to the gear portion.

11. The planetary gear is an upper gear located above the planetary gear and having a plurality of teeth arranged in parallel on an outer periphery thereof; a lower gear located below the upper gear and having a plurality of teeth arranged in parallel on an outer periphery thereof; an in-phase portion in which a position of one of the teeth of the upper gear and a position of one of the teeth of the lower gear coincide with each other in a circumferential direction; an indicator portion disposed on an upper surface and a lower surface of the in-phase portion, the indicator portion indicating that the in-phase portion is the in-phase portion; The planetary gear mechanism according to any one of claims 1 to 10, further comprising:

12. A planetary gear mechanism as described in any one of claims 1 to 11, wherein lubricant is applied to each of the contact areas of the sun gear, the fixed internal gear, the planetary gear, the movable internal gear, and the carrier portion.

13. A geared motor having a planetary gear mechanism described in any one of claims 1 to 12.

14. A geared motor according to claim 13, A spool with string material is provided. The geared motor rotates the spool in both forward and reverse directions; A lacing module for winding and unwinding the lacing material onto and from the spool.

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