JPH1122789A - Epicyclic reduction gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the contact of a rolling stone or obstruction to prevent the damage of an epicyclic reduction gear by engaging a recessed part on the end surface of a casing with a protruding part on the side surface of a carrier to arrest the rotation of the carrier. SOLUTION: A key 29a (protruding part) provided on the side surface of a second-stage carrier 29B and a key groove 13a (recessed part) provided on the end surface of a casing 13B have increasable key widths and decreasable key heights on the respective side surface and end surface, respectively. Since the end surface of the case 13B is engaged with the side surface of the carrier 29B by key groove structure, and fastened by a bolt 38A, a retainer can be abolished, and the horizontal space can be minimized. Therefore, the lateral width of an epicyclic reduction gear 12 is minimized, while the distance S2 with the outer end of a crawler 16 is increased, so that contact of a rolling stone or obstruction can be prevented to prevent the damage of the epicyclic reduction gear 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear reducer applied to a traveling drive device of a construction machine such as a hydraulic shovel or the like, and more particularly, to a planetary gear in which a fixed portion between a final stage carrier and a casing is made compact. Related to reduction gears.

[0002]

2. Description of the Related Art A conventional planetary gear reducer of a traveling drive device for a construction machine such as a hydraulic excavator is shown in FIG.
A two-stage planetary gear reducer 12 is used. To the two-stage planetary gear reducer 12, a driving force is input to a sun gear shaft 19 directly connected to the hydraulic motor 11 built in the casing 13, and the gears of the two-stage planetary gear reducer 12, which will be described in detail later. The driving force is transmitted to the housing 14 by the above-described method. The sprocket 15 is integrally fastened to the housing 14 of the two-stage planetary gear reducer 12 via a support member 32. When the two-stage planetary gear reducer 12 is rotated, the teeth of the sprocket 15 are engaged with the crawler belt 16 and the crawler belt 16 is rotated to drive the vehicle. The two-stage planetary gear reducer 12 is attached to a track frame 17 by a casing 13 with bolts 17a.

The structure of a conventional two-stage planetary gear reducer 12 will be schematically described with reference to FIG. 10 and FIG. 11 which is an enlarged view of a main part of FIG. A sun gear shaft 19 is connected to a shaft 18 of the hydraulic motor 11 by a coupling 20.
A first-stage sun gear 21 is provided at an end of the shaft 9. 1
First stage planetary gear 22 meshing with the first stage sun gear 21
Are supported by the first-stage carrier 23 and are also meshed with the internal gear 24 of the cylindrical housing 14. The first stage carrier 23 is connected to a second stage sun gear 25 provided around the first stage sun gear shaft 19 by a spline 26. The second stage sun gear 25 is
Retainer 27 fixed to casing 13 with bolt 38
And a second-stage planetary gear 30 supported by a second-stage carrier 29 connected by a spline 28. The second-stage planetary gear 30 also meshes with the internal gear ring gear 24 to move the housing 14 as a rotating body into two.
It is designed to rotate stepwise.

The rotation of the housing 14 causes a support member 32 connected to the housing 14 by bolts 31 to rotate integrally. The support member 32 has an inner peripheral portion rotatably supported by the casing 13 by means of a bearing 33, and a sprocket 15 meshing with the crawler belt 16 and being driven to travel is attached to the outer peripheral portion by bolts. ing. Reference numeral 35 denotes a floating seal, and 36 denotes a cover attached to the outermost end of the housing 14 by the bolt 31.

In the second-stage planetary gear reducer 12 configured as described above, the second-stage carrier 29 is connected to the casing 13.
For example, as shown in FIG. 11, a retainer 27 having an outer periphery joined to a second-stage carrier 29 and a spline 28 is brought into contact with the end face of the casing 13 to thereby form a bolt 38
Is fastened. The bearing 33 has its axial dimension adjusted by a shim 37 and is held by the retainer 27. As another example, as shown in FIG. 12, a screw 42 is provided on an outer peripheral portion reduced in diameter from the bearing surface of the casing 13 </ b> A, and the bearing 33 is tightened and held in an axial direction by a nut 45. A spline 41 is provided on the outer peripheral portion having a smaller diameter, and the second-stage carrier 29A is connected to the spline 41. In this case, the spline 4
The lock 44 engaged with 1 is fixed to the nut 45 with a bolt 46 to prevent the nut 45 from loosening.

[0006]

However, FIG.
In the conventional example shown in (1), since the driving torque of the second-stage carrier 29 acts on the spline 28 of the retainer 27, it is necessary to secure a predetermined amount of the spline 28 width B from the viewpoint of strength. As a result, as shown in FIG. 10, the width of the planetary gear reducer 12 in the lateral direction is increased, the distance S1 to the outer end of the crawler belt is reduced, and a boulder or an obstacle contacts the planetary gear reducer. 12 is damaged. Also, 2
The stage carrier 29 is connected to the casing 1 via the retainer 27.
In order to fix it to 3, it is necessary to fasten using, for example, many 24 bolts for the above-mentioned strength reasons. For this reason, there are problems in that the number of bolts is large, so that the assemblability is poor and the production cost is high. Further, FIG.
In the conventional example shown in FIG. 11, since the nut 45 is provided for holding the bearing 33, the planetary gear reducer 12 has a further greater lateral width than the conventional example shown in FIG. However, there is a problem that the distance S1 from the outer end of the crawler belt becomes small.

In view of the above problems, the present invention has improved the method of fixing the second stage carrier and the casing, and has eliminated the retainer, thereby reducing the width of the planetary gear reducer in the lateral direction. By increasing the distance S2 from the end, it is possible to prevent rocks and obstacles from being damaged by contact with the planetary gear reducer, and to reduce the number of fastening bolts for the second stage carrier and the casing. It is an object of the present invention to provide a planetary gear reducer with improved assemblability and low manufacturing cost.

[0008]

In order to achieve the above object, a first planetary gear reducer according to the present invention is provided.
The invention relates to a planetary gear reducer in which a carrier of a planetary gear reducer connected to an output shaft of a hydraulic motor fitted inside a casing is mounted so as to prevent rotation with respect to the casing. 1
A concave portion is formed on one of the side surfaces of the carrier 29B facing the 3B, and a convex portion is formed on the other side, and the concave portion and the convex portion formed on the respective end surfaces and side surfaces are engaged to rotate the carrier 29B. This is a configuration that prevents it. According to the above configuration, the end face of the casing 13B and the side surface of the carrier 29B are engaged with the concave and convex portions to form the carrier 29B.
As shown in FIG. 10,
By eliminating the retainer 27 of the conventional planetary gear reducer and reducing the lateral space, the lateral width of the planetary gear reducer 12 shown in FIG. 1 is reduced, and the distance S2 from the outer end of the crawler belt is reduced. The planetary gear reducer 12 can be prevented from coming into contact with a boulder, an obstacle, or the like, and can be prevented from being damaged.
Therefore, the durability of the planetary gear reducer is improved because damage due to contact with boulders and obstacles is prevented, and the planetary gear reducer is made compact and the manufacturing cost is reduced by eliminating the conventional retainer. Become.

According to a second aspect of the present invention, in the configuration of the first aspect, the carrier thick rib portion 29b formed between the planetary gears 30 uniformly attached to the carrier 29B in the circumferential direction.
And the end face of the casing 13B are brought into contact with each other and fastened by bolts 38A to prevent the rotation of the carrier 29B. According to the above configuration, since the bolt 38A is disposed on the thick rib portion 29b where the rigidity of the carrier 29B is the largest, a sufficient fastening force can be obtained. As a result, the number of bolts can be greatly reduced as compared with the conventional planetary gear reducer shown in FIG. 10, and the carrier and the casing can be securely attached. Therefore, the number of bolts is small, so that the assemblability is improved and the cost is reduced.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the side surface of the shaft 30b supporting the planetary gears 30 uniformly attached to the carrier 29B in the circumferential direction is brought into contact with the end surface of the casing 13B. , Bolt 3
8B, the rotation of the carrier 29B is prevented. According to the above configuration, since the bolt 38B is provided on the shaft 30b that supports the planetary gear 30, a sufficient fastening force can be obtained. As a result, the number of bolts can be greatly reduced as compared with the conventional planetary gear reducer shown in FIG. 10, and the carrier and the casing can be securely attached. Therefore, the number of bolts is small, so that the assemblability is improved and the cost is reduced.

According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the end face of the casing 13B and the carrier 29 are provided.
The concave and convex portions that engage the side surfaces of B are bolts 38A, 3
It is configured to be disposed closer to the axis than 8B. According to the above configuration, since the transmission torque is large due to the concave portion and the convex portion that engage the end surface of the casing 13B and the side surface of the carrier 29B, the number of fastening bolts 38A and 38B can be reduced, and the casing 13B Between the end face of the carrier 29B and the side face of the carrier 29B.
Since the concave portion and the convex portion are not provided on the surface to be fastened by A and 38B, the bolts 38A and 38B can be securely fastened. Therefore, the bolt is not loosened and the durability is improved.

According to a fifth aspect of the present invention, in the configuration according to the first aspect or the fourth aspect, the carrier 29B is provided.
The concave portion and the convex portion formed on the side surface of the housing 13B and the end surface of the casing 13B are configured to be engaged with the key 29a by the key groove 13a or to be connected by radial splines 40a, 40b. According to the above configuration, the casing 13
B and the side surface of the carrier 29B are engaged with the key 29a and the key groove 13a, or the radial spline 40
Since the connection is made at the points a and 40b, the rotation of the carrier 29B can be surely prevented. Therefore, the durability of the planetary gear reducer is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a planetary gear reducer according to the present invention will be described below with reference to FIGS. FIG.
Those denoted by the same reference numerals are the same parts. First, a first embodiment of a planetary gear reducer will be described with reference to FIGS. FIG. 1 shows the entire planetary gear reducer. FIG. 2 is an enlarged view of a main part of the planetary gear reducer. FIG. 3 shows N in FIG.
It is a figure which shows the engagement state of a key and a keyway in -N sectional drawing.
FIG. 4 is a detailed explanatory view of the side surface of the second-stage carrier that contacts the casing. First, as shown in FIG. 1, a sun gear shaft 19 is connected to a shaft 18 of the hydraulic motor 11 by a coupling 20. At the shaft end of the sun gear shaft 19, a first-stage sun gear 21 is provided. The first-stage planetary gear 22 that meshes with the first-stage sun gear 21 is supported by the first-stage carrier 23 and also meshes with the internal gear 24 of the cylindrical housing 14. The first-stage carrier 23 is connected to a second-stage sun gear 25 provided around the first-stage sun gear shaft 19 by a spline 26. A key 29a is provided on a side surface of the second-stage carrier 29B shown in FIG. A keyway 13a is provided on an end face of the casing 13B. The side surface of the second-stage carrier 29B and the end surface of the casing 13B are engaged by a key 29a and a key groove 13a, and fastened by a bolt 38A. The shaft 30a is fitted to the rib 29d of the second-stage carrier 29B. This shaft 30
A second stage planetary gear 30 is rotatably attached to a. The second stage sun gear 25 is a second stage carrier 29B.
And the second-stage planetary gear 30 supported by the second gear. The second-stage planetary gear 30 meshes with the internal gear ring gear 24, and rotates the housing 14 as a rotating body at two-stage speed.

By the rotation of the housing 14, the support member 32A connected to the housing 14 by the bolt 31 is integrally rotated. The support member 32A has an inner peripheral portion rotatably supported by a casing 13B by a bearing 33, and a sprocket 15 meshing with the crawler belt 16 is attached to an outer peripheral portion by a bolt. Reference numeral 35 denotes a floating seal, and 36 denotes a cover attached to the outermost end of the housing 14 by the bolt 31.

Next, the casing 13 which is a main part of the present invention is described.
The structure in which the end face of the second carrier 29B is engaged with the side face of the second-stage carrier 29B is fixed to either the end face of the casing 13B or the side face of the second-stage carrier 29B facing the end face of the casing 13B. A concave portion is formed on one side, and a convex portion is formed on the other side, and the concave portion and the convex portion formed on the respective end faces and side surfaces are engaged with each other to prevent the rotation of the carrier 29B. The concave and convex portions for engaging the end surface of the casing 13B with the side surface of the second-stage carrier 29B are described in detail in FIGS. 2 to 4 of the first embodiment and FIGS. In FIG. 6, the recess is formed by the keyway 13a,
In addition, the description has been made with the projection as the key 29a. Also, in FIGS. 7 to 9 of the third embodiment, the concave portions are formed by the spline grooves 40.
b and the projection are described as spline peaks 40a. In addition, a concave portion and a convex portion for engaging the end surface of the casing 13B with the side surface of the second-stage carrier 29B may be formed of a serration. In the present invention, the embodiment in which the second-stage carrier is fixed to the casing to prevent the rotation of the second-stage carrier by using the two-stage planetary gear reducer has been described. It goes without saying that the present invention can be applied to a reduction gear. That is, a main object of the present invention is to fix the carrier on the fixed side and the casing (connected to the vehicle body) without taking up a large space, and to make the planetary gear reducer compact. Hereinafter, the planetary gear reducer of the present invention will be described.

A planetary gear reducer according to a first embodiment will be described with reference to FIG. 1 and FIGS. First, FIG.
As shown in the figure, the casing 13B and the second stage carrier 29
B is centered by the spigot P1 and abuts on the coupling surface Q to perform lateral positioning. A key 29a is provided on the second-stage carrier 29B so as to protrude laterally outward from the contact surface Q on the inner diameter side of the spigot P1. A bolt hole 29c is formed through the thick rib portion 29b of the second-stage carrier 29B in the drawing. In the second-stage carrier 29B, as shown in FIG. 4, six keys 29a and three bolt holes 29c are respectively provided at equal circumferential intervals. A casing 1 facing six keys 29a and three bolt holes 29c of the second stage carrier 29B shown in FIG.
3B is provided with six key grooves 13a and three screw holes 13b. As shown in FIG. 3, the casing 13B and the second-stage carrier 29B are fixedly mounted by engaging the key 29a with the key groove 13a and fastening them with bolts 38A. The axial dimension of the bearing 33 shown in FIG. 2 is adjusted by the shim 37, and is held by the second-stage carrier 29B.

According to the first embodiment of the planetary gear reducer according to the present invention, the key 2 provided on the side surface of the second-stage carrier 29B
As shown in FIG. 3, the key width 9a (the convex portion) and the key groove 13a (the concave portion) provided on the end face of the casing 13B have a large key width b and a high key height. H can be reduced. Further, the end face of the casing 13B and the side face of the carrier 29B are engaged in a key groove structure,
8A, the conventional retainer 27 shown in FIG. 10 is eliminated and the lateral space is reduced, so that the lateral width of the planetary gear reducer 12 shown in FIG. 1 is reduced. , The distance S2 from the outer edge of the track becomes larger,
It is possible to prevent contact with a boulder, an obstacle, and the like, and prevent damage to the planetary gear reducer 12. Further, the casing 13B
And the side surface of the carrier 29B can be securely fixed by being engaged with the side surface of the carrier 29B, and the transmission torque is large due to the key groove structure. Can be reduced. This allows
As damage by contact with boulders and obstacles is prevented,
The durability of the planetary gear reducer is improved, and the number of fastening bolts 38A is small, so that the assemblability is improved.
With the elimination of the conventional retainer, the planetary gear reducer becomes compact and the manufacturing cost is reduced. Furthermore, since the bolts are arranged at the places where the rigidity of the thick rib portions of the carrier is the highest, a sufficient fastening force can be obtained. Moreover, assembling becomes easy and the cost is reduced. Further, since the key groove 13a and the key 29a for engaging the casing 13B and the carrier 29B are arranged at a position closer to the axis than the bolt 38A, the casing 13B and the carrier 29B are connected by the bolt 38A. Since the key and the key groove are not provided on the surface to be fastened, the bolt can be securely fastened. As a result, the bolt is not loosened and the durability is improved.

Next, the second embodiment of the planetary gear reducer according to the present invention will be described.
An embodiment will be described with reference to FIGS. 1 to 4
The components denoted by the same reference numerals are the same components and have the same functions, and the description thereof is omitted here. FIG. 5 shows the entire planetary gear reducer of the second embodiment. FIG. 6 is a detailed explanatory view of the side surface of the second-stage carrier that contacts the casing. As shown in FIGS. 5 and 6, a shaft 30b is fitted to the rib 29d of the second-stage carrier 29B. 2
The stage carrier 29B is provided with six keys 29a. The casing 13B is provided with six key grooves 13a. Second-stage carrier 29B and casing 1
3B means a key (projection) 29a and a key groove (recess) 13a
And are engaged. Further, a bolt 38B is inserted into a bolt hole formed in a shaft 30b, which supports a planetary gear 30 uniformly attached to the carrier 29B in the circumferential direction, and fastened to a screw hole provided in the casing 13B. It has become. For this reason, the side surface of the carrier 29B is brought into contact with the end surface of the casing 13B, and the bolt 38
B makes it possible to securely prevent rotation of the carrier 29B. According to the second embodiment, since the bolt 38B is provided on the shaft 30b that supports the planetary gear 30, a sufficient fastening force can be obtained. As a result, the number of bolts can be greatly reduced as compared with the conventional planetary gear reducer shown in FIG. 10, and the carrier and the casing can be securely attached. Therefore, the number of bolts is small, so that the assemblability is improved and the cost is reduced. In the second embodiment, as in the first embodiment, the planetary gear reducer 1 shown in FIG.
2 becomes narrower in the horizontal direction, and the distance from the outer end of the crawler belt S2
To prevent contact with a boulder, an obstacle, or the like, and damage to the planetary gear reducer 12 can be prevented. The other effects are the same as those of the first embodiment, and are omitted here.

A third embodiment of the planetary gear reducer according to the present invention will be described with reference to FIG. 1 and FIGS. FIG.
FIG. 3 is an enlarged view of a main part of the planetary gear reducer. FIG. 8 is a diagram showing the engagement state of the spline in the MM sectional view of FIG.
FIG. 9 is a detailed explanatory view of the side surface of the second-stage carrier that contacts the casing. The structure of the planetary gear reducer shown in FIG. 7 other than the joint between the casing 13c and the second-stage carrier 29E is the same as that of FIG. 1 of the first embodiment, and the description is omitted here. As shown in FIG. 7, the casing 13c and the second-stage carrier 29E are aligned with each other using the inlay P2.
As shown in FIG.
a (the second stage carrier 29B side) and the spline groove 40b
(On the casing 13B side) to perform lateral positioning. As shown in FIG. 7, the second-stage carrier 29E
A radial spline 40 is provided on the end face of the outer side from the axis. The second carrier 29 is provided on the casing 13c.
A similar radial spline 40 is provided facing E. A bolt hole 29c is formed through the thick rib portion 29b of the second-stage carrier 29E. Case 1
3c is provided with a screw hole 13b facing the bolt hole 29c of the second stage carrier 29E. As shown in FIG. 8, the spline 40 is engaged between the second stage carrier 29E and the casing 13c, and the spline groove 40b of the casing 13c is brought into contact with the spline peak 40a of the spline 40 of the second stage carrier 29E. Then, the second-stage carrier 29E and the casing 13c are fixedly fastened by fastening with the bolt 38A. The axial dimension of the bearing 33 is adjusted by the shim 37A, and is held by the second-stage carrier 29E.

According to the third embodiment of the planetary gear reducer of the present invention, the end face of the casing 13B and the side face of the carrier 29B are connected to the radial splines 40a and 40b and fastened with the bolt 38A. By eliminating the conventional retainer 27 shown in FIG. 10 and reducing the space in the lateral direction, the lateral width of the planetary gear reducer 12 shown in FIG. 1 is reduced, and the distance S2 to the outer end of the crawler belt is increased. In this way, it is possible to prevent contact with a boulder, an obstacle, or the like, and prevent damage to the planetary gear reducer 12. Other effects are also first
This is the same as the embodiment, and the description is omitted here.

In the first embodiment of the planetary gear reducer of the present invention described above, the end face of the casing 13B and the side face of the carrier 29B are engaged with the key 29a and the key groove 13a. The thick rib portion 19b of 29B and the casing 13B are fastened by bolts 38A. In the case of the second embodiment, the end face of the casing 13B and the side face of the carrier 29B are connected to the key 29a and the key groove 13a.
And a carrier 2 supporting the planetary gear 30 uniformly attached in the circumferential direction of the carrier 29B.
A bolt 38B is inserted into a bolt hole formed in the shaft 30b fitted to the rib portion 29d of the 9B, and fastened to a screw hole provided in the casing 13B. In the case of the third embodiment, the end face of the casing 13B and the carrier 29
The side surfaces of B are connected by radial splines 40a and 40b, and the thick rib portion 19b of the carrier 29B and the casing 13B are fastened by bolts 38A. These configurations of the first to third embodiments can be appropriately combined and used. For example, the casing 13B
And the side surface of the carrier 29B are connected by radial splines 40a, 40b, and the carrier 29B
A bolt 38B is inserted into a bolt hole formed in a shaft 30b fitted to a rib 29d of a carrier 29B supporting a planetary gear 30 uniformly attached in the circumferential direction of the planetary gear 30. It may be fastened to the hole.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a planetary gear reducer according to the present invention.

FIG. 2 is an enlarged view of a main part of the planetary gear reducer.

FIG. 3 is a sectional view taken along the line NN in FIG. 2;

FIG. 4 is a detailed explanatory view of a side surface of a second-stage carrier abutting on the casing of the first embodiment.

FIG. 5 is an explanatory view of a second embodiment of the planetary gear reducer according to the present invention.

FIG. 6 is a detailed explanatory view of a side surface of a second-stage carrier abutting on a casing of the second embodiment.

FIG. 7 is an enlarged view of a main part of a third embodiment of the planetary gear reducer according to the present invention.

FIG. 8 is a sectional view taken along the line MM of FIG. 7;

FIG. 9 is a detailed explanatory view of a side surface of a second-stage carrier abutting on the casing of the third embodiment.

FIG. 10 is a diagram illustrating a conventional planetary gear reducer.

FIG. 11 is an enlarged view of a first example of a main part of the planetary gear reducer.

FIG. 12 is an enlarged view of a second example of the main part of the planetary gear reducer.

[Explanation of symbols]

11: hydraulic motor, 12: planetary gear reducer, 13, 13
A, 13B, 13c: casing, 13a: convex portion (key), 13b: screw hole, 14: housing, 15: sprocket, 16: crawler belt, 17: track frame, 21
... 1st stage sun gear, 22 ... 1st stage planetary gear, 23
... First stage carrier, 24 ... Inner ring gear, 25 ... Second stage sun gear, 27 ... Retainer, 28 ... Spline, 2
9, 29A, 29B, 29E: 2nd stage carrier, 29a
... recess (key groove), 29b ... thick rib, 29c ... bolt hole, 29d ... rib, 30 ... second stage planetary gear,
30a, 30b: shaft, 32, 32A: support member,
33: Bearing, 37, 37A: Shim, 38, 38A, 38
B: bolt, 40: spline, 40a: convex portion (spline peak), 40b: concave portion (spline groove).

Claims (5)

[Claims] 1. A planetary gear reducer in which a carrier of a planetary gear reducer connected to an output shaft of a hydraulic motor fitted in a casing is mounted so as to prevent rotation with respect to the casing. A concave portion is formed on one of the end surface and the side surface of the carrier (29B) facing the casing (13B), and a convex portion is formed on the other, and the concave portion and the convex portion formed on each end surface and side surface are related. A planetary gear reducer characterized by preventing rotation of the carrier (29B). 2. A side face of a thick rib portion (29b) of a carrier formed between planetary gears (30) uniformly provided in a circumferential direction on a carrier (29B) and an end face of a casing (13B). Abut, tighten with bolts (38A) and carrier (29B)
The planetary gear reducer according to claim 1, wherein rotation of the planetary gear is prevented. 3. A side surface of a shaft (30b) for supporting a planetary gear (30) uniformly attached to a carrier (29B) in the circumferential direction is brought into contact with an end surface of a casing (13B).
The planetary gear reducer according to claim 1 or 2, wherein the carrier (29B) is prevented from rotating by being fastened by (8B). 4. An end face of a casing (13B) and a carrier (29).
The concave and convex portions that engage the side surfaces of B) are bolts (38A, 38B)
The planetary gear reducer according to claim 2 or 3, wherein the planetary gear reducer is disposed at a position closer to the shaft center. 5. The planetary gear reducer according to claim 1, wherein a side surface of the carrier (29B) and a casing (13) are provided.
The concave and convex portions formed on the end face of (B) are engaged with the key (29a) and the key groove (13a), or the radial spline (4
0a, 40b).