JP4283368B2 - Inscribed mesh planetary gear structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swinging intermeshing planetary gear structure provided with a so-called balance weight.
[0002]
[Prior art]
Conventionally, a first shaft, an eccentric body installed on the outer periphery of the first shaft, an eccentric body bearing rotatably supported by the eccentric body, and the first shaft incorporated in the outer periphery of the eccentric body bearing An external gear capable of rotating eccentrically with respect to the internal gear, an internal gear internally meshing with the external gear, and an external gear connected to the external gear so as to absorb the eccentric rocking component of the external gear. An intermeshing planetary gear structure having two shafts is known. In this type of structure, there is a structure as shown in FIG. 4 having a balance weight in order to balance the load due to the centrifugal force of the external gear.
[0003]
FIG. 4 shows the internal structure of the motor roller mr in which the motor m1 and the reduction gear r are housed in a pipe.
[0004]
The motor roller mr has a structure that decelerates the rotation of the motor m1 by the reduction gear r and transmits the reduced rotation output to the pipe 10 for output.
[0005]
The speed reducer r belongs to a so-called oscillating intermeshing planetary gear speed reducer, and is installed on the outer periphery of the motor shaft (first shaft) 2 that outputs the rotation of the motor m1. Eccentric body 4, eccentric body bearing 6 rotatably supported by the eccentric body 4, and external teeth incorporated on the outer periphery of the eccentric body bearing 6 and capable of eccentric oscillating rotation with respect to the first shaft 2 Via a gear 8, an internal gear 12 in mesh with the external gear 8, and a transmission shaft 14 (second shaft) that can absorb the eccentric oscillation component of the external gear 8 in the external gear 8. Connected blocks 24. A balance weight 16 is disposed at a position adjacent to the eccentric body bearing 6 in order to balance the load due to the centrifugal force of the external gear 8.
[0006]
The motor m1 is supplied with power from a lead wire 30 as a power line. The motor shaft 2 of the motor m1 is rotatably supported by a bearing 22.
[0007]
Further, the internal gear 12 is configured to output only the rotation component of the external gear to the output pipe 18 side by fixing the internal gear 12 itself to the stationary member (pipe) 10 so as not to be relatively rotatable. ing.
[0008]
The transmission shaft 14 (second shaft) has a structure that absorbs an eccentric oscillation component of the external gear, and is connected to the block 24 by a spline.
[0009]
The rotation decelerated by the reduction gear r is output from the output pipe 18 through a block 24 connected to the transmission shaft 14 by a spline.
[0010]
A groove 32 is formed in the output pipe 18 so that the transmission belt 20 can be hung on the groove 32.
[0011]
Here, the enlarged view of the V section of FIG. 4 is shown in FIG.
[0012]
As shown in FIG. 5, the balance weight 16 is vibrated in a direction opposite to the vibration of the external gear 8 in order to suppress vibration due to the centrifugal force of the external gear 8 (to balance the load). Is incorporated in the motor shaft 2 so as to cancel vibrations. The balance weight 16 needs to have a stepped shape so as to have an inner ring pressing function of the bearing (of the eccentric body bearing 6) (see FIG. 4). The step-shaped balance weight 16 can be easily manufactured by sintering, but is disadvantageous in terms of cost and strength. Therefore, the distance piece 26 acting as a spacer as shown in FIG. It is often arranged between the eccentric bearing 6 (see FIG. 5). Thus, by separating the balance weight body 16A and the distance piece 26 as separate members, the inner ring 6A of the bearing 6 is pressed, and at the same time, the balance weight body 16A and the outer ring 6B of the bearing 6 and the external gear 8 slide. Preventing contact.
[0013]
[Problems to be solved by the invention]
However, there are the following problems.
[0014]
In the method of making the balance weight 16 by sintering, a large-scale facility is required, and as described above, the cost of equipment investment is high. There is also a problem that the strength cannot be increased.
[0015]
On the other hand, manufacturing the balance weight 16 separately for the balance weight main body 16A and the distance piece 26 is advantageous in terms of cost and strength, but increases the number of parts.
[0016]
The present invention has been made in view of such conventional problems, and provides an intermeshing planetary gear structure incorporating a balance weight that has a bearing inner ring pressing function and a spacer function and can be manufactured at low cost. The task is to do.
[0017]
[Means for Solving the Problems]
The invention described in claim 1 includes a first shaft, an eccentric body installed on an outer periphery of the first shaft, an eccentric bearing supported rotatably on the eccentric body, and an outer periphery of the eccentric bearing. An external gear incorporated and capable of rotating eccentrically with respect to the first shaft, an internal gear internally engaged with the external gear, and an eccentric gear component of the external gear on the external gear. A second shaft coupled so as to be absorbable, and an inscribed portion having a balance weight at a position adjacent to the eccentric body bearing so as to cancel vibration due to centrifugal force of the external gear. In the mesh planetary gear structure, the balance weight is formed by a plurality of plates that are caulked in a stacked state, and a surface on which a convex portion formed as a result of caulking is present is formed with the eccentric bearing. toward joined side by Rukoto incorporated to the first axis, the convex portion Axial movement of the inner ring of the eccentric bearing by a structure to be regulated I, is obtained by solving the above problems.
[0018]
This makes it possible to reduce the number of parts, reduce man-hours, reduce costs, facilitate manufacturing, and improve the durability of parts while having the same functions as the conventional balance weight with steps. be able to.
[0019]
According to a second aspect of the present invention, the caulking position is set between an outer periphery of a portion where the balance weight of the first shaft is incorporated and a range smaller than an outermost peripheral diameter of the inner ring of the eccentric body bearing. Thus, the above-mentioned problem is solved in the same manner.
[0020]
Claim 2 specifically shows the caulking position in claim 1.
[0021]
By setting the caulking position in this way, the balance weight can be rotated integrally with the eccentric or the inner ring of the eccentric body bearing, and the balance weight and the outer ring or the external gear of the eccentric body bearing Can be prevented from sliding contact. Therefore, heat generation can be prevented and durability of each component can be improved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0023]
FIG. 2 is a cross-sectional view of an intermeshing planetary gear structure provided with a balance weight according to an embodiment of the present invention. FIG. 1 is a partially enlarged view of a portion I in FIG.
[0024]
Since the intermeshing planetary gear structure shown in FIG. 2 is basically the same as the intermeshing planetary gear structure of FIG. 4 described in “Prior Art”, the same or similar parts are denoted by reference numerals in the figure. The same number is assigned to the last two digits, and repeated explanation is omitted.
[0025]
As shown in FIG. 2, in this embodiment as well, in order to suppress the vibration due to the centrifugal force of the external gear 108 (to balance the load), the external gear 108 is vibrated in the opposite direction. Accordingly, a balance weight 116 that absorbs vibration is incorporated in the motor shaft 102.
[0026]
Since the present invention is characterized by the balance weight 116 itself and the manner of incorporation, the balance weight 116 will be mainly described.
[0027]
FIG. 3A is a front view of the balance weight 116 of the present embodiment, and FIG. 3B is a cross-sectional view taken along line BB in FIG.
[0028]
The balance plate 116 is formed by laminating a plurality of plates 124 by a plurality of press processes. Then, as indicated by the arrows shown in FIG. 3B, they are integrated by caulking from the same direction. As for the caulking means and method, a known method can be employed, and there is no particular limitation here.
[0029]
Thus, the convex part 130 is formed in the same direction by the result of caulking with the plurality of plates 124 being overlapped.
[0030]
In this embodiment, four caulking positions are caulked at equal intervals as shown in FIG. 3A. However, the caulking position and the number of caulking are not particularly limited in the present invention. In addition, the magnitude | size of the convex part formed may be equal. Alternatively, it may be formed (continuously) in all broken line portions H at a distance of R from the center O1 of the motor shaft 102.
[0031]
The radius R is limited to a range smaller than the diameter on the outer peripheral side of the inner ring 106A of the eccentric bearing 106. The balance weight 116 can be rotated integrally with the eccentric body 104 or the inner ring of the eccentric body bearing 106 by being within this range, and the outer weight 106B or the external gear of the balance weight 116 and the eccentric body bearing 106 can be rotated. This is because sliding contact with 108 can be prevented.
[0032]
In the present embodiment, the plurality of plates 124 are caulked in this manner, and the balance weight 116 on which the convex portions 130 are formed is formed as shown in FIG. The other surface P is incorporated into the motor shaft (first shaft) 102 with the side facing the eccentric body bearing 104 being joined.
[0033]
That is, the balance weight 116 having the convex portion is provided with a bearing inner ring pressing function.
[0034]
By doing in this way, it becomes unnecessary to install the distance piece 26 used conventionally, and a number of parts can be reduced.
[0035]
In addition, the formation of the convex portion 130 only requires laminating and pressing the pressed plates 124 (no need for manufacturing by sintering), eliminating the need for large-scale facilities, reducing man-hours, and capital investment. Reduction (cost reduction), facilitating manufacturing.
[0036]
Furthermore, since the protrusion 130 rotates in the same manner while being in contact with the inner ring 106A of the eccentric bearing 106, heat generated from rubbing against each other can be prevented. There is no particular problem in strength. On the other hand, the balance weight body that vibrates violently is a stack of press plates, so that sufficient strength can be secured in this respect.
[0037]
In the present embodiment, the motor roller MR in which the motor and the speed reducer are built in the pipe 110 has been mainly described, but the present invention is not particularly limited to this structure.
[0038]
【The invention's effect】
As described above, according to the present invention, caulking is performed in a state in which a plurality of plates are laminated, and as a result, a convex portion is formed, and the surface on which the convex portion is formed is on the joint side with the eccentric body bearing. seen embedded in the first axis towards, for which is adapted to restrict the axial movement of the inner ring of the eccentric bearing by convex portions, the number of parts can be reduced, reducing the man-hour, cost, ease in manufacturing, parts All improvements in durability can be realized.
[Brief description of the drawings]
FIG. 1 is a partially enlarged view of a portion I of FIG. 2 in an intermeshing planetary gear structure according to the present embodiment. FIG. 2 is a cross-sectional view showing the entire inner structure in the intermeshing planetary gear structure according to the present embodiment. FIG. 3 is a view showing a plate and a balance weight according to the present embodiment. FIG. 4 is a cross-sectional view showing the entire internal structure of an intermeshing planetary gear structure in the prior art. FIG. FIG. 6 is a partially enlarged view of a portion V in FIG. 4 in the planetary gear structure. FIG. 6 is a diagram showing a distance piece in the prior art.
102: Motor shaft (first shaft)
104 ... eccentric body 106 ... eccentric body bearing 110 ... pipe 116 ... balance weight 124 ... plate 130 ... convex part

Claims (2)

A first shaft, an eccentric body installed on the outer periphery of the first shaft, an eccentric body bearing rotatably supported by the eccentric body, and an outer periphery of the eccentric body bearing; An external gear capable of rotating eccentrically and rotating, an internal gear internally meshing with the external gear, and a second shaft connected to the external gear so as to absorb the eccentric rocking component of the external gear And an intermeshing planetary gear structure having a balance weight at a position adjacent to the eccentric body bearing so as to cancel vibration due to centrifugal force of the external gear,
The balance weight is
Formed by a plurality of plates crimped in a stacked state; and
The surface of the person who caulked results formed protrusions are present toward the junction side of said eccentric body bearings by Rukoto incorporated to the first axis, the convex portion of the inner ring of the eccentric bearing An intermeshing planetary gear structure characterized in that axial movement is restricted . In claim 1,
The caulking position is set between an outer periphery of a portion where the lance weight of the first shaft is incorporated and a range smaller than an outermost peripheral diameter of an inner ring of the eccentric body bearing. Engagement planetary gear structure.

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