JP2001263437A - Planetary gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planetary gear device which can absorb the shock between the input and the output, and withstand any large load. SOLUTION: This planetary gear device comprises a sun gear, internal gears disposed around the sun gear, a carrier rotatably provided coaxially with the sun gear, a support shaft 41b extended from the carrier 29 and disposed between the sun gear and the internal gear, and a planetary gear 30 rotatably supported by the support shaft 41b and engaged with the sun gear and the internal gear. The carrier 29 comprises a carrier body 41 provided with the support shaft 41b and integrally rotated with the support shaft 41b, an output portion 43 engageable with the carrier body 41 in the rotational direction thereof, and elastic members 42b, 42c provided between the carrier body 41 and the output portion 43. For the load within a predetermined range, the carrier body 41 and the output portion 43 transmit the power via the elastic members 42b, 42c, and for the load exceeding the predetermined range, the carrier body 41 is directly engaged with the output portion 43 to transmit the power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a planetary gear device.

[0001]

2. Description of the Related Art Conventionally, there is a speed reduction mechanism which can absorb a shock between input and output by using rubber or the like. As a planetary gear device which is a reduction mechanism capable of absorbing a shock, there is one disclosed in Japanese Utility Model Laid-Open No. 6-67949. This planetary gear device includes a sun gear, an internal gear, and a carrier provided coaxially, and a planet gear supported by a support shaft protruding from the carrier and meshed with the sun gear and the internal gear. An elastic bush is fitted between the support shaft and the inner periphery of the shaft hole of the planetary gear fitted to the support shaft. Thereby, the shock can be absorbed (mitigated) between the input and output from the sun gear to the carrier.

[0002]

However, in the planetary gear device disclosed in Japanese Utility Model Laid-Open Publication No. 6-67949, in which an elastic member such as rubber is simply interposed between input and output, a large load is applied. There is a problem that the rubber cannot be tolerated and is destroyed (plastically deformed).

[0003] An object of the present invention is to provide a planetary gear device that can absorb an impact between input and output and can withstand a large load.

[0004]

According to a first aspect of the present invention, there is provided a sun gear, an internal gear disposed around the sun gear, and a carrier rotatably provided on the same axis as the sun gear. A support shaft extending from the carrier and disposed between the sun gear and the internal gear, and a planetary gear rotatably supported by the support shaft and meshed with the sun gear and the internal gear. In the planetary gear device, the carrier includes a carrier body formed with the support shaft and integrally rotating with the support shaft, an output unit that can be engaged with the carrier body in a rotational direction, the carrier body and the carrier body. An elastic member provided between output portions, wherein the carrier body and the output portion transmit power via an elastic member to a load having a size in a predetermined range, and to a load larger than the predetermined range. Is Serial carrier body and the output unit is directly engaged with and summarized in that linked to transfer power.

According to a second aspect of the present invention, in the planetary gear device according to the first aspect, a main body side engaging surface extending in the radial direction is formed on the carrier main body, and the carrier extends in the output portion in the radial direction. An output portion side engagement surface that can be engaged in the rotation direction with the main body side engagement surface is formed, a receiving recess extending in the rotation direction from one of the engagement surfaces is recessed, and a part of the elastic member is formed. The gist of the present invention is that the elastic member is housed in the housing recess, another part of the elastic member is protruded from the housing recess, and the protruding end is brought into contact with the other engaging surface to be connected.

According to a third aspect of the present invention, in the planetary gear device according to the second aspect, the main body side engaging surfaces are formed as a pair so as to face in a rotational direction, and the housing recesses are formed in the respective recesses. A concave portion is provided from the main body side engaging surface, the elastic member is provided in each of the accommodating concave portions, and the output portion side engaging surface is formed on the output portion. The gist is that the engaging piece is disposed so as to be sandwiched between a pair of elastic members provided so as to face in the rotation direction.

[0007] The invention described in claim 4 is the invention according to claims 1 to 3.
In the planetary gear device according to any one of the above, the gist is that the carrier main body is connected so as to be movable in a radial direction with respect to the output portion.

According to a fifth aspect of the present invention, in the planetary gear device according to the third aspect, the carrier body is formed in a ring shape, and the output portion has a gap on an inner peripheral side of the carrier body. And the engaging piece formed radially outside of the disk portion, and the carrier body is connected to the output portion so as to be movable in the radial direction. That is the gist.

[0009] The invention according to claim 6 is the invention according to claims 1 to 5.
In the planetary gear device according to any one of the above, a plurality of the support shafts and the planetary gears are provided, and the elastic member is provided between the planetary gears.

(Operation) According to the first aspect of the present invention,
The carrier main body and the output unit transmit power via a resilient member to a load within a predetermined range. Therefore, the impact between the input and the output is reduced in this planetary gear device. In addition, for a load larger than the predetermined range, the carrier body and the output section are directly engaged to transmit power. Therefore, in this planetary gear device, the elastic member is not broken even if a load larger than a predetermined range is applied between input and output.

According to the second aspect of the present invention, the carrier body and the output portion are configured such that the elastic member is formed by the rotation-direction-side end of the housing recess and the engagement surface with respect to a load within a predetermined range. To transmit power. Therefore, the impact between the input and the output is reduced in this planetary gear device. In addition, for a load larger than the predetermined range, the carrier main body and the output section are directly engaged by the main body side engagement surface and the output section side engagement surface to transmit power.
At this time, the elastic member is housed in the housing recess, and does not receive any further stress. Therefore, in this planetary gear device, the elastic member is not broken even if a load larger than a predetermined range is applied between input and output.

According to the third aspect of the present invention, the carrier main body and the output unit are provided for a load in a predetermined range, regardless of whether the load is in one direction or in the reverse direction. The rotation side end of the housing recess and the engagement surface (engagement piece)
Thus, power is transmitted through the elastic member. Therefore, the impact between the input and the output is reduced in this planetary gear device. In addition, in both cases of the load in one direction and the load in the opposite direction, the carrier main body and the output portion are connected to the main body side engagement surface and the output portion side engagement surface (engagement) for a load larger than a predetermined range. Piece)
And engage directly to transmit power. At this time, the elastic member is housed in the housing recess, and does not receive any further stress.
Therefore, in this planetary gear device, the elastic member is not broken even if a load larger than a predetermined range is applied between input and output.

According to the fourth aspect of the present invention, for example, by fixing the output portion to an external load, even if the position is shifted from the same axis line of the sun gear and the internal gear, the carrier main body is output. The carrier body is automatically moved in the radial direction so that the meshing of the planetary gear, the sun gear and the internal gear does not become unbalanced because the part can be moved in the radial direction. Therefore, normal meshing between the planetary gears and each (sun and internal gear) gear is maintained.

According to the invention described in claim 5, according to claim 4,
The same effect as the effect of the invention described in (1) can be obtained.
Moreover, the carrier body is formed in a ring shape, and the output portion is formed by a disc portion provided with a gap on the inner peripheral side of the carrier body and an engagement piece formed radially outside the disc portion. Therefore, the carrier body and the output portion do not enlarge the planetary gear device in the axial direction.

According to the sixth aspect of the present invention, since the elastic member is provided between the plurality of planetary gears, the elastic member does not increase the size of the planetary gear device in the axial direction.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a motor for a wiper will be described below with reference to FIGS.

As shown in FIG. 1, the motor 1 includes a motor main body 2 and a speed reduction unit 3. The motor body 2 includes a substantially cylindrical yoke housing (hereinafter simply referred to as a yoke) 4 having one end open, a plurality of magnets 5 fixed to the inner peripheral surface of the yoke 4, and substantially housed in the yoke 4. (Rotor) 6.

The rotor 6 has an armature (armature) 8 fixed to a rotating shaft 7 and a commutator 9. A worm 11 is formed on the tip side of the rotating shaft 7. The rotating shaft 7 has a base end rotatably supported by a bearing 10 disposed at the bottom (left end in FIG. 1) of the yoke 4.

The reduction section 3 includes a gear housing 20, a cover 21 (see FIG. 2), and a reduction unit 22 as a reduction member. A side end of the gear housing 20 connected and fixed to the yoke 4 is formed in a substantially rectangular shape when viewed from the direction of the axis of the rotating shaft 7. 20a is recessed. The gear housing 20 has a brush housing recess 20.
A worm housing portion 20b is formed extending from the center of the bottom of a and housing the tip end (the worm 11) of the rotary shaft 7. In the gear housing 20, a direction perpendicular to the axis of the intermediate portion of the worm housing portion 20b (downward in FIG. 1).
Is formed with a wheel accommodating portion 20c communicating with the worm accommodating portion 20b. This wheel housing 20c
Is formed in a substantially circular shape when viewed from the direction orthogonal to the rotation axis 7 and, as shown in FIG. 2, one end (left side in the figure) is open. An output shaft hole 20d penetrating outside is formed in the center of the other end side of the wheel accommodating portion 20c.

A bearing 2 is provided in the opening of the worm housing 20b.
5, and an intermediate portion of the rotating shaft 7 is rotatably supported by the bearing 25. As shown in FIG. 2 (omitted in FIG. 1), an internal gear 26 is disposed on the inner periphery of the wheel accommodating portion 20c. The internal gear 26 is displaced from the worm 11 in the axial direction of the wheel accommodating portion 20c (the direction orthogonal to the plane of FIG. 1 and the left direction in FIG. 2).

The reduction gear unit 2 is provided in the wheel accommodating portion 20c.
2 are accommodated. As shown in FIG. 2, the reduction unit 22 includes a wheel 27, a sun gear 28, and a carrier 2.
9 and three (only one is shown in FIG. 2) planetary gears 30
And an output shaft 31. In the present embodiment, the internal gear 26, the sun gear 28, and the carrier 2
9 and three planetary gears 30 constitute a planetary gear device. The wheel 27 has teeth on the outer circumference and has the worm 11
A ring-shaped worm wheel portion 27a meshing with the worm wheel portion 27a, and an axial direction from the inner periphery of the worm wheel portion 27a (FIG. 2)
(In the middle and left directions) and a cylindrical portion 27 b disposed inside the internal gear 26. The sun gear 28 has a cylindrical portion 27b
It is externally fitted so as to be integrally rotatable.

The carrier 29 includes a carrier body 41 (FIG. 4).
), A rubber member 42, and an output section 43 (see FIG. 5). The carrier body 41 is shown in FIGS.
As shown in FIG. On the upper surface (the right side surface in FIG. 2) of the carrier body 41, three gear receiving recesses 41a extending downward and opening inward and outward in the radial direction are formed at equal angular intervals, and a support shaft 41b is provided at the bottom center of the recess 41a. Is erected. Each planetary gear 30 is rotatably supported by the support shaft 41b by being fitted around the support shaft 41b, and the planetary gear 30 is prevented from falling off by a washer 44. The depth of the gear housing recess 41a and the height of the planetary gear 30 are set to be substantially the same, and the planetary gear 30 is housed in the substantially recess 41a except that the teeth project from the radial opening of the recess 41a. .

On the lower surface of the carrier body 41 (the left side surface in FIG. 2, and the lower surface in FIG. 4B), three stepped portions 41c which are recessed upward are formed at equal angular intervals. FIG.
As shown in (c), a substantially U-shaped U-shaped step portion 41d having an opening on the clockwise direction side is formed at the clockwise end of the step portion 41c viewed from the lower surface. At a counterclockwise end of the step portion 41c viewed from the lower surface, a concave portion 41e which is further recessed upward is formed, and a pair of main bodies facing in the rotational direction with both end surfaces on the rotational direction extending in the radial direction. The side engagement surfaces 41f and 41g are configured. Also, the carrier body 4
On the lower surface of 1, three substantially fan-shaped rubber member accommodating recesses 41 h that are recessed upward are formed at equal angular intervals. More specifically, the rubber member housing recess 41h is formed in a fan shape having an outer diameter smaller than the outer diameter of the carrier body 41 and an inner diameter larger than the inner diameter of the carrier body 41.
The rubber member housing recess 41h is formed deeper than the recess 41e. The rubber member accommodating recess 41h includes a portion where the recess 41e is formed, and includes a main body side engaging surface 41h.
f, 41g so as to extend outward in the rotational direction. In this embodiment, the rubber member accommodating recess 41 is used.
h in the rotation direction from the main body side engagement surface 41f (FIG. 4 (c)).
The portion extending in the middle and clockwise directions constitutes a housing recess 41i, and is located outside the body side engagement surface 41g in the rotation direction (FIG. 4).
(C), the portion extending in the counterclockwise direction) constitutes the accommodation recess 41j. Also, the rubber member accommodating recess 41
h is formed between each gear accommodating recess 41a (each planetary gear 30) so as to avoid each gear accommodating recess 41a.

The rubber member accommodating recess 41h accommodates a rubber member 42 formed in a substantially fan shape. A fitting recess 42a that extends upward and opens in the radial direction is formed at an intermediate portion of the recess 41e of the rubber member 42. In the present embodiment, as shown in FIG. 4C, the first elastic portion 42b is formed on the clockwise side of the fitting recess 42a of the rubber member 42 when viewed from the lower surface, and the fitting recess 42a
The more counterclockwise direction side constitutes the second elastic portion 42c. The first and second elastic portions 42b and 42c constitute an elastic member. The first and second elastic portions 42b, 42
A part of c protrudes from the accommodation recesses 41i and 41j in the rotation direction and faces each other. Here, the first and second elastic portions 4
2b and 42c, the protruding ends of the receiving recesses 41i,
The recess 41 is urged toward the rotation-side end of the recess 41j.
It is set so that it is not destroyed even if it is reduced to the opening in the rotation direction of i, 41j.

On the lower end surface of the carrier body 41, a projection 41k projecting downward is formed in a portion of the step portion 41c surrounded by the U-shaped step portion 41d. The output unit 43
As shown in FIG. 5, the disk portion 45 and three extension portions 46 are provided.
And three engagement pieces 47. More specifically, the disk portion 45 is formed in an annular shape whose outer diameter is slightly smaller than the inner diameter of the carrier body 41 (see FIG. 6). Three extensions 46
Are formed on the outer edge of the disk portion 45 so as to extend radially outward at equal angular intervals. A substantially U-shaped U-shaped portion 46a having an opening on the counterclockwise direction is formed at a counterclockwise end of the extension 46 as viewed from above. The engagement piece 47 is formed to protrude upward from a clockwise side end of the extension part 46 as viewed from above. The engagement piece 47 extends in the radial direction. In the present embodiment, both end faces on the rotation direction side of the engagement piece 47 constitute output section side engagement faces 47a and 47b. The base end of the output shaft 31 is fitted in the disk part 45.

As shown in FIG. 6, the output portion 43 has a shape such that the disk portion 45 has a gap on the inner peripheral side of the carrier body 41, and the extension portion 46 fits into the step portion 41c. The engagement piece 47 is fitted into the fitting recess 42a (so as to be sandwiched between the first and second elastic portions 42b and 42c).
It is assembled to the carrier body 41. This output unit 4
3 is prevented from coming off in the axial direction by a washer 48 fitted to each projection 41k of the carrier main body 41.
In FIG. 6, one of the washers 48 is indicated by a two-dot chain line.

Carrier 29, planetary gear 30, and output shaft 3
1 is assembled so that the planetary gear 30 meshes with the internal gear 26 and the sun gear 28 and the intermediate portion of the output shaft 31 passes through the cylindrical portion 27b of the wheel 27 as shown in FIG. Have been.

That is, the speed reduction unit 22 is connected to the output shaft 31
Of the worm wheel portion 2 is supported through a pair of slide bearings 49 fixed to the output shaft hole 20d.
7a meshes with the worm 11, and each planetary gear 30
The wheel accommodating portion 20 c is engaged with the internal gear 26.
Housed within.

As shown in FIG. 2, a cover 21 is fixed to an opening of the wheel housing portion 20c of the gear housing 20. The output shaft 31 is connected to a wiper blade (not shown) via a link mechanism (load) (not shown) that converts one-way rotation into reciprocating motion.

In the motor 1 configured as described above, when the rotating shaft 7 (worm 11) is driven to rotate, the wheel 2
The sun gear 7 and the sun gear 28 rotate integrally. Based on the rotation, the planetary gear 30 revolves around the sun gear 28 while rotating, and the carrier main body 41 rotates with the revolution.

When the carrier body 41 rotates counterclockwise when viewed from below (see FIG. 6),
The output portion 43 and the output shaft 31 rotate in the same counterclockwise direction because the rotation direction side end of 1i pushes the output portion engagement surface 47a via the first elastic portion 42b. Then, the wiper blade reciprocates to perform the wiping operation.

That is, the reduction mechanism of the motor 1 reduces and outputs the rotation speed of the rotating shaft 7 (rotor 6) in two stages by the worm gear and the planetary gear device. Next, the characteristic operation and effect of the above embodiment will be described below.

(1) For example, when some resistance such as snow exists on the wiping surface of the vehicle windshield when the wiper is driven, a one-way load is applied to the output shaft 31 via the link mechanism, which is larger than that in the normal wiping. When the magnitude of the load is within a predetermined range (a range in which the first elastic portion 42b is contracted and its end is not moved to the position of the rotation direction side opening of the accommodation recess 41i), the rotation direction of the accommodation recess 41i is determined. Power is transmitted from the side end to the output section side engagement surface 47a via the first elastic section 42b. At this time, as the first elastic portion 42b contracts, the impact due to the load is absorbed (mitigated). Therefore, for example, a large impact is not applied between the worm 11 and the wheel 27, and the teeth of the motor 1 are damaged.
Is prevented.

(2) When the magnitude of the load in one direction is larger than the predetermined range, as shown in FIG. 7, the main unit side engaging surface 41f and the output unit side engaging surface 47a are directly engaged, and Is transmitted. At this time, the first elastic portion 42b is housed in the housing recess 41i, and receives no further stress. Therefore, even if a load larger than the predetermined range is applied, the first elastic portion 4
2b is not broken (plastically deformed).

(3) For example, when the wiper blade reaches the lowermost portion of the vehicle windshield and turns over, the inertia of the wiper blade causes the output shaft 31 to face in the opposite direction to that during normal wiping via a link mechanism. Load is added. When the magnitude of the load is within a predetermined range (a range in which the second elastic portion 42c is contracted and its end is not moved to the position of the rotation direction side opening of the accommodation recess 41j), the rotation direction of the accommodation recess 41j Power is transmitted from the side end portion to the output portion side engaging surface 47b via the second elastic portion 42c. At this time, as the second elastic portion 42c shrinks, the impact due to the load is absorbed (mitigated). Therefore, for example, the worm 11 and the wheel 2
Failures such as breakage of the teeth without a large impact between the seven are prevented.

(4) When the magnitude of the load in the opposite direction is larger than the predetermined range, as shown in FIG. 8, the main body side engaging surface 41g and the output section side engaging surface 47b are directly engaged, and Is transmitted. At this time, the second elastic portion 42c is housed in the housing recess 41j, and does not receive any further stress. Therefore, even if a load larger than the predetermined range is applied, the second elastic portion 4
2c is not broken (plastically deformed).

(5) Since the disk portion 45 of the output portion 43 is provided with a gap on the inner peripheral side of the carrier main body 41, the disk portion 45 comes into contact with the inner peripheral side of the carrier main body 41, or The carrier main body 41 can move in the radial direction with respect to the output unit 43 until the side engagement surfaces 41f and 41g and the output unit side engagement surfaces 47a and 47b are directly engaged. Therefore, even if the output portion 43 is fixed to the link mechanism, for example, and its position is shifted from the same axis line of the sun gear 28 and the internal gear 26, the meshing of the gears 26, 28, 30 (gear reaction force) The carrier body 41 automatically moves in the radial direction so that the unbalance of (1) does not occur. Therefore, the normal meshing between the planetary gear 30 and the (sun and internal gear) gears 26 and 28 is maintained. As a result, generation of vibration and abnormal noise is reduced.

(6) The carrier main body 41 is formed in a ring shape, and the output portion 43 is formed in a disk portion 45 disposed on the inner peripheral side of the carrier main body 41 and a step portion formed radially outside the disk portion 45. 41c, and the first and second
The carrier main body 41 and the output portion 43 do not increase the size of the planetary gear device in the axial direction because the engagement portion 47 is sandwiched between the elastic portions 42b and 42c.

(7) The rubber member accommodating recess 41h is formed between each gear accommodating recess 41a (each planetary gear 30) so as to avoid the gear accommodating recess 41a, and the rubber member 42 (first and second elastic portions 42b, 42c). ) Are provided in the rubber member accommodating recess 41h, so that the rubber member 42 (the first and second elastic portions 42) is provided.
b, 42c) do not enlarge the planetary gear set in the axial direction.

(8) The rubber member accommodating recess 41h (accommodating recesses 41i, 41j) is open at the lower side (the lower side in FIG. 4B), so that the rubber member 42 can be easily assembled. it can.

(9) First and second elastic portions 42 forming a pair
Since the members b and 42c are connected to one member (rubber member 42), the number of parts and the number of assembling steps are reduced. (10) Three support shafts 41b, three planetary gears 30 and three engaging pieces 47 are provided at equal angular intervals, and the main body side engaging faces 41f,
41g, accommodation recesses 41i and 41j, and first and second elastic portions 42b and 42c are provided in three pairs at equal angular intervals.
Therefore, each planetary gear 30 is composed of the sun gear 28 and the internal gear 2.
6 is well-meshed. Further, power is transmitted between the carrier main body 41 and the output section 43 in a well-balanced manner. Further, the weight balance of the entire carrier 29 including the carrier main body 41 and the output portion 43 is improved.

The above embodiment may be modified as follows.・ For a load within a predetermined range, the carrier body and the output section transmit power via an elastic member, and for a load larger than the predetermined range, the carrier body and the output section directly engage to generate power. If connected so as to be transmitted, another configuration may be used.

In the above-described embodiment, the carrier body 41 and the output unit 43 are connected to the first or the output unit 43 for a load in a predetermined range regardless of the load in one direction and the load in the reverse direction. Power is transmitted through the second elastic portions 42b and 42c, and the carrier body 4
Although the power is transmitted by directly engaging the output unit 1 with the output unit 43, the power may be transmitted as described above only for a load in one direction. For example, the second elastic portion 42c of the rubber member 42 is deleted so that the housing recess 41j is not formed. Even in this case, the effect (1) of the above embodiment,
The same effects as (2), (6) to (8), and (10) can be obtained.

In the above embodiment, the carrier body 41
Can be moved in the radial direction with respect to the output portion 43. For example, the disk portion 45 is provided so that there is no gap with the inner peripheral side of the carrier body 41, and the carrier body 41 is moved in the radial direction with respect to the output portion 43. You may make it impossible to move. Even in this case, the effects (1) to (4) of the above embodiment,
The same effects as (6) to (10) can be obtained.
Further, the carrier main body 41 may be changed to another configuration in which the carrier main body 41 can move in the radial direction with respect to the output section 43.

In the above embodiment, the first and second elastic portions 42b and 42c are provided between the gear receiving recesses 41a (the respective planetary gears 30) so as to avoid the gear receiving recesses 41a (each planetary gear 30). And the first and second elastic portions 42b,
42 c (rubber member 42) may be provided below the planetary gear 30. Even in this case, the effect (1) of the above embodiment is obtained.
To (5) and (8) to (10).

In the above embodiment, the lower side of the rubber member housing recess 41h (housing recesses 41i, 41j) (FIG. 4B)
Although the middle and lower sides are open, they do not have to be open. Even in this case, the effects (1) to (7) of the above embodiment,
The same effects as (9) and (10) can be obtained.

In the above embodiment, one member (rubber member 42) is used to connect the pair of first and second elastic portions 42b and 42c, but they may be separate members. Even in this case, the effects (1) to (8) of the above embodiment,
The same effect as (10) can be obtained.

In the above embodiment, three support shafts 41b, three planetary gears 30 and three engagement pieces 47 are provided at equal angular intervals, and the main body side engagement surfaces 41f and 41g, the accommodation recesses 41i,
Although three pairs of 41j and the first and second elastic portions 42b and 42c are provided at equal angular intervals, the numbers may be appropriately changed. Even in this case, the effects (1) to the effects of the above-described embodiment can be obtained.
The same effect as (9) can be obtained.

In the above embodiment, the present invention is embodied in the motor 1 for a wiper, but may be embodied in a motor used for other purposes. In the above-described embodiment, the motor 1 that is driven to rotate only in one direction is embodied. However, the motor that is driven to rotate in both forward and reverse directions may be embodied by including the planetary gear device. In this case, the carrier main body 41 and the output section 43 are connected to the first or second elastic sections 42b and 42 for a load within a predetermined range regardless of whether the rotation is in one direction or in the reverse direction.
The power is transmitted via the power transmission line c, and for a load larger than a predetermined range, the carrier main body 41 and the output portion 43 are directly engaged to transmit the power.

In the above embodiment, the planetary gear device is provided in the motor 1, but may be provided in another device.
The technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects.

(A) In the planetary gear device according to claim 2, the output-portion-side engaging surfaces are formed in pairs so as to face in the rotation direction, and the accommodating recesses are formed in the respective output-portion-side engagement portions. Recessed from the surface, the elastic member is provided in each of the accommodation recesses,
The main body side engaging surface is a rotation direction side end face of a radially extending engaging piece formed on the carrier main body, and is sandwiched between a pair of elastic members provided such that the engaging piece faces in the rotating direction. A planetary gear device, wherein the planetary gear device is arranged so as to be rotated. With this configuration, the same effect as the effect of the invention described in claim 3 can be obtained.

(B) The planetary gear device according to any one of claims 2 to 6 and (a), wherein one end of the housing recess in the axial direction is opened. With this configuration, the elastic member can be easily assembled.

(C) Claims 3 to 6 and (a),
(2) The planetary gear device according to any one of (1) to (4), wherein the pair of elastic members are connected to form a single member. In this way, the number of parts and the number of assembling steps can be reduced.

(D) In the planetary gear device according to claim 6 and any one of (a) to (c), the three support shafts and the three planetary gears are provided at equal angular intervals, respectively.
The planetary gear device, wherein the main body side engaging surface, the housing recess, and the elastic member are provided in three pairs at equal angular intervals, respectively, and the three engaging pieces are provided. This way,
Each planetary gear is meshed with the sun gear and the internal gear with good balance. Further, power is transmitted between the carrier body and the output portion in a well-balanced manner. Further, the weight balance of the entire carrier including the carrier body and the output section is improved.

(E) Claims 1 to 6 and (A) to (D)
(D) The planetary gear device according to any one of (1) and (2), wherein the elastic member is rubber.
In this case, even if a load larger than the predetermined range is applied between input and output, the rubber is not broken.

(F) Claims 1 to 6 and (a) to (b)
A motor comprising the planetary gear device according to any one of (e) and (e). In this way, in the planetary gear device, the shock between the input and the output is reduced, so that the failure of the motor is prevented. Moreover, the elastic member is not broken.

[0057]

As described in detail above, according to the present invention,
It is possible to provide a planetary gear device that can absorb a shock between input and output and can withstand a large load.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part for describing a motor according to an embodiment.

FIG. 2 is a sectional view taken substantially along the line AA of FIG. 1;

FIG. 3 is an essential part cross-sectional view for explaining the carrier of the present embodiment.

FIG. 4A is a plan view illustrating a carrier body according to the present embodiment. (B) A side view for explaining the carrier body. (C) A bottom view for explaining the same carrier body.

FIG. 5 is a perspective view illustrating an output unit according to the embodiment.

FIG. 6 is a bottom view of the carrier according to the present embodiment.

FIG. 7 is a bottom view for explaining the operation of the carrier according to the present embodiment.

FIG. 8 is a bottom view for explaining the operation of the carrier according to the present embodiment.

[Explanation of symbols]

26: internal gear, 28: sun gear, 29: carrier, 3
0: sun gear, 41: carrier body, 43: output unit, 4
5 ... disk part, 47 ... engagement piece, 41b ... support shaft, 41f,
41g: main body side engagement surface, 41i, 41j: accommodation recess, 4
2b, 42c... First and second elastic portions, 47a, 47b.
Output unit side engagement surface.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihiko Harada 390 Umeda, Kosai-shi, Shizuoka Asmo Co., Ltd. (72) Inventor Keiichi Uemura 390 Umeda, Kosai-shi, Shizuoka Asmo Co., Ltd. F-term (reference) 3J027 FA37 FB01 FB40 GA01 GB03 GC13 GC22 GD04 GD08 GD12 3J063 AB12 AC01 BA09 BA10 BB12 CA01 CB06 CB48 XB03 XC10

Claims (6)

[Claims] 1. A sun gear (28) and said sun gear (2).
8), an internal gear (26) disposed around the periphery of the sun gear (28), a carrier (29) rotatably provided on the same axis as the sun gear (28), and the sun gear extending from the carrier (29). (28)
And a support shaft (41) disposed between the internal gear (26) and the internal gear (26).
b), and a planetary gear (30) rotatably supported by the support shaft (41b) and meshed with the sun gear (28) and the internal gear (26). The carrier (29) includes a carrier body (41) formed with the support shaft (41b) and integrally rotating with the support shaft (41b), and an output unit (41) capable of engaging with the carrier body (41) in the rotational direction. 43) and an elastic member (42b, 42c) provided between the carrier body (41) and the output portion (43), and the carrier body (41) is provided with a load in a predetermined range. The output unit (4
3) transmits power via elastic members (42b, 42c), and for a load larger than the predetermined range, the carrier body (41) and the output portion (43) are directly engaged to transmit power. A planetary gear device, wherein the planetary gear device is connected to the planetary gear device. 2. The planetary gear set according to claim 1, wherein a body-side engaging surface (41f, 41g) extending in a radial direction is formed on the carrier body (41), and a radial direction is formed on the output portion (43). And an output portion side engaging surface (47a, 47b) that is rotatable with the main body side engaging surface (41f, 41g), and one of the engaging surfaces (41f, 41g) is formed. The housing recesses (41i, 41j) extending in the rotation direction are recessed, and a part of the elastic member (42b, 42c) is housed in the housing recess (41i, 41j), and the elastic member (42b, 42c) The other part is inserted into the housing recess (41
i, 41j), and the protruding end thereof is brought into contact with the other engagement surface (47a, 47b) to be connected. 3. The planetary gear device according to claim 2, wherein the main body side engaging surfaces (41f, 41g) are formed in pairs so as to face in the rotation direction, and the housing recesses (41i, 41j) are formed. The elastic member (42b, 42c) is provided in each of the housing concave portions (41i, 41j), and the output portion-side engaging surface (47a, 41j) is provided. 47b) is a pair of radially extending engagement pieces (47) formed on the output portion (43), which are both end faces on the rotation direction side, and provided such that the engagement pieces (47) face each other in the rotation direction. Elastic members (42b, 42
c) a planetary gear set arranged so as to be sandwiched by c). 4. The planetary gear device according to claim 1, wherein the carrier body (41) is connected to the output portion (43) so as to be movable in a radial direction. A planetary gear set characterized by the above. 5. The planetary gear device according to claim 3, wherein the carrier body (41) is formed in a ring shape, and the output portion (43) is provided with a gap on an inner peripheral side of the carrier body (41). A disk portion (45) provided with the above, and the engaging piece (47) formed radially outside of the disk portion (45). A planetary gear device, which is connected to the output portion (43) so as to be movable in a radial direction. 6. The planetary gear device according to claim 1, wherein a plurality of the support shafts (41b) and the planetary gears (30) are provided, and the elastic members (42b, 42c) are provided. Planetary gear (3
0) A planetary gear set provided between the two.