JP2001165247A - Carrier structure of planetary ring body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the carrier structure of a planetary ring body such as a planetary gear, a planetary roller capable of reducing product costs by using a sheet metal carrier 1 and by eliminating the need for a planetary shaft 5 for supporting a planetary gear 4. SOLUTION: A projected part 1a formed on a sheet metal carrier 1 faces a projected part 2a formed on a carrier plate 2. A planetary gear 4 is rotatably externally fitted on the projected part 1a and the projected part 2a, respectively. The same may be applied to the planetary roller instead of the planetary gear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary wheel such as a planetary gear or a planetary roller used for a speed reducer or the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A planetary gear mechanism is sometimes used for a speed reducer, a speed increaser, and the like. In the planetary gear mechanism, internal gears are arranged at intervals on the coaxial outer periphery of the sun gear, and a plurality of planetary gears are inserted between the sun gear and the internal gear to mesh with each other. Each planetary gear is rotatably mounted at a position equidistant from the axis of the carrier. Therefore, in this planetary gear mechanism, when a rotational drive is applied to the sun gear, each planetary gear revolves around the sun gear while rotating, so that reduced rotation is transmitted to the internal gear or the carrier. Further, when a rotational drive is applied to the internal gear or the carrier, each planetary gear revolves around the inner circumference of the internal gear while rotating, whereby the increased rotation is transmitted to the sun gear.

An example of a conventional carrier structure to which the above-mentioned planetary gear is attached will be described with reference to FIGS. 2 and 3. FIG. The carrier includes a carrier body 8, a carrier plate 2, and a mounting shaft 3.
It is composed of The carrier body 8 is a disc made of aluminum. A recess for inserting a sun gear (not shown) is provided in the center from one end face of the disc, and planets are provided at three equal angular intervals around the recess. Gear 4
Are respectively provided. The carrier plate 2 is a disk made of sheet metal, and has a hole at the center portion for passing a sun gear.

The carrier plate 2 is in contact with one end face of the carrier body 8, and the pins 6 are press-fitted from the carrier plate 2 side into portions other than the recesses of the carrier body 8 by screwing small screws. Fixed. Further, through holes are respectively formed at the center of the three recesses around the carrier body 8 and at a position facing the carrier plate 2, and the planetary shaft 5 is press-fitted into each of these through holes. The planetary gears 4 are rotatably fitted on the three planetary shafts 5 via bushes 7 in advance. The mounting shaft 3 is formed by forming a screw on the other end of a round bar made of an iron material. One end of the mounting shaft 3 is press-fitted into a through hole formed at the center of a hollow at the center of the carrier body 8 and fixed.

Accordingly, a sun gear (not shown) is inserted from one end of the carrier structure into a hollow at the center of the carrier body 8 through a hole at the center of the carrier plate 2 and meshed with the three planetary gears 4 inside. At the same time, a planetary gear mechanism can be configured by covering an internal gear (not shown) from the other end side and meshing with the three planetary gears 4 on the outside.

[0006]

However, the carrier structure of the planetary gear having the above structure requires a planetary shaft 5 to make the planetary gear 4 rotatable, and the planetary shaft 5 is connected to the carrier body 8 and the carrier plate 2. Must be press-fitted. In addition, the carrier body 8 must be manufactured by cutting an aluminum disk, and it is necessary to press-fit the pins 6 and screw small screws to fix the carrier plate 2.

[0007] For this reason, the conventional carrier structure of the planetary gear has a problem that the number of parts is increased and the number of manufacturing steps is increased, so that the productivity is low and the product cost is high.

The present invention has been made in order to cope with such circumstances, and a planetary wheel such as a planetary gear or a planetary roller is externally fitted to a cylindrical projection formed on a sheet metal member to be rotatable. Accordingly, an object of the present invention is to provide a carrier structure of a planetary wheel body that can reduce the cost of a product.

[0009]

According to a first aspect of the present invention, there is provided a carrier structure of a planetary wheel body in which a plurality of planetary wheel bodies are rotatably mounted at the same distance from the axis of the carrier. A part of the two sheet metal members facing each other are fixed to each other and integrated as a carrier.
A planetary wheel is rotatably fitted to a plurality of cylindrical projections projecting from at least one of the sheet metal members toward the other.

According to the first aspect of the present invention, the planetary wheel body is fitted around the cylindrical convex portion of the sheet metal member and becomes rotatable.
There is no need to separately install a planetary shaft, and the number of parts and the number of manufacturing steps can be reduced.

According to a second aspect of the present invention, each of the planetary rings is rotatably fitted to a cylindrical projection of a sheet metal member via a bush.

According to the second aspect of the present invention, since the planetary wheel is externally fitted to the cylindrical projection via the bush, the planetary wheel can be smoothly rotated.

According to a third aspect of the present invention, the cylindrical convex portion is
It is characterized in that it protrudes from both opposing positions of the two sheet metal members so as to face each other.

According to the third aspect of the present invention, the length can be reduced to about half as compared with the case where the cylindrical convex portion is formed only on one sheet metal member, so that the sheet metal processing can be facilitated. .

According to a fourth aspect of the present invention, the two sheet metal members bend a plurality of peripheral portions of one of the sheet metal members to the other side, and insert the leading ends into holes formed in the other sheet metal member. It is characterized by being integrated by crimping.

According to the fourth aspect of the invention, since the two sheet metal members can be integrated by caulking, the number of parts and the number of manufacturing steps can be further reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of a carrier structure of a planetary gear in a planetary wheel body, and FIG. 2 is a side view of a carrier structure of a planetary gear. It is a front view. Components having the same functions as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals.

As shown in FIGS. 1 and 2, the carrier shown in this embodiment is a sheet metal carrier 1 and a carrier plate 2.
And the mounting shaft 3. The sheet metal carrier 1 is a substantially triangular sheet metal iron plate having vertexes in an arc shape, and circular boss-shaped protrusions 1 are respectively provided near three vertices.
a is formed. Each projection 1a is formed by projecting the plate surface of the sheet metal carrier 1 into a cylindrical shape on one side (the left side in FIG. 1) by press working. Since the cylindrical end has a circular bottom surface, a circular boss is formed. It is shaped like a protrusion. These three convex portions 1 a are equidistant from the axis of the sheet metal carrier 1 and are arranged at equal angular (120 °) intervals. Each of three sides of the triangular shape of the sheet metal carrier 1 is provided with a leg 1b projecting from the edge and bent to one side. These legs 1b
A protrusion is formed at the center of the tip. Further, a hole is formed in a central portion through which the axis of the sheet metal carrier 1 passes, and one end of the mounting shaft 3 is caulked here.

The carrier plate 2 is a disk made of sheet metal, and is provided with three circular boss-shaped protrusions at three positions at equal angular intervals away from the axis by the same distance as the respective protrusions 1a of the sheet metal carrier 1. 2a is formed. Each projection 2a is formed by pressing the plate surface of the carrier plate 2 on the other side (FIG. 1).
(Right side of the figure), and has a circular bottom surface at the tip of the cylinder, so that it is a circular boss-shaped projection. Therefore, the sheet metal carrier 1 and the carrier plate 2 can be aligned with the center of the axis so that the three convex portions 1a and the convex portions 2a can face each other accurately. In this carrier plate 2, caulking holes 2b are formed at positions where the protrusions at the tips of the three legs 1b of the sheet metal carrier 1 are fitted when the protruding portions 1a and the protruding portions 2a face each other. Have been. Further, a hole for passing the sun gear is formed in the center of the carrier plate 2.

The mounting shaft 3 is formed by forming a screw on the other end of a round bar made of an iron material. One end of the mounting shaft 3 is fixed by being caulked to the hole in the center of the sheet metal carrier 1 as described above.

In the sheet metal carrier 1, three projections 1a and two projections 2a are opposed to each other by aligning the axis with the carrier plate 2, and a planetary gear 4 is bushed to each of the projections 1a and the projections 2a. 7 is fitted outside. The bush 7 is made of resin or the like. Then, the protrusions at the tips of the legs 1 b of the sheet metal carrier 1 are inserted into the caulking holes 2 b of the carrier plate 2, and these protrusions are caulked from one side of the carrier plate 2. Then, the sheet metal carrier 1 and the carrier plate 2 are integrated, and the planetary gear 4 is fitted on the convex portion 1a and the convex portion 2a to be rotatable.

In the carrier having the above structure, a sun gear (not shown) is inserted from one side through a hole at the center of the carrier plate 2 to mesh with the three planetary gears 4 on the inside, and an inner gear (not shown) from the other side. A planetary gear mechanism can be configured by covering the gears and meshing with the three planetary gears 4 on the outside.

Accordingly, in the carrier structure of the present embodiment, the planetary gear 4 is supported by the sheet metal carrier 1 and the projections 1a and 2a of the carrier plate 2 for rotation, so that the conventional planetary shaft 5 is used. This is unnecessary, and the step of press-fitting the planet shaft 5 becomes unnecessary. In addition, since not only the carrier plate 2 but also the sheet metal carrier 1 is made of sheet metal, once a mold is formed, it can be mass-produced by a press step with high productivity. Further, since the sheet metal carrier 1 and the carrier plate 2 can be fixed simply by inserting the projection at the tip of the leg 1b into the caulking hole 2b and caulking, the pin 6 is press-fitted or a small screw is screwed as in the conventional case. You don't have to.

In the above embodiment, the planetary gear 4 is connected to the sheet metal carrier 1 and the carrier plate 2 via the bush 7.
However, if the planetary gear 4 can keep a smooth rotation, the bush 7 is not necessarily required. In addition, a metal bush may be used instead of the resin bush 7, or another bearing member may be used.

Further, in the above-described embodiment, the convex portions 1a and 2a of the sheet metal carrier 1 and the carrier plate 2 are formed in a circular boss shape having a circular bottom surface. For good reason, it is also possible to protrude into a cylindrical shape without a bottom. Further, in the above embodiment, the case where the convex portions 1a and the convex portions 2a are formed on both the sheet metal carrier 1 and the carrier plate 2 has been described, but at least one of the sheet metal carrier 1 and the carrier plate 2 has the convex portions 1a.
Alternatively, if the convex portion 2a is formed, the planetary gear 4 can be externally fitted. However, if the projections 1a and 2a are formed on both sides as in the above embodiment, these projections 1a
Since the length of the projections and the projections 2a can be reduced by almost half, it is possible to easily perform the press working for accurately projecting into a cylindrical shape.

Further, in the above embodiment, the case where the protrusion at the tip of the leg 1b of the sheet metal carrier 1 is inserted into the caulking hole 2b of the carrier plate 2 and swaged is shown. Any part can be fixed to each other and integrated as a carrier. For example, the bottoms of the convex portions 1a and 2a of the sheet metal carrier 1 and the carrier plate 2 are brought into contact with each other and welded, or the convex portions 1a or 2a formed on any of the sheet metal carrier 1 and the carrier plate 2. Can be welded by contacting the bottom surface of the carrier plate 2 with the plate surface of the carrier plate 2 or the sheet metal carrier 1. Further, the present invention is not limited to the above-described planetary gears, and can be applied to a carrier of a planetary wheel such as a planetary roller.

[0028]

As is clear from the above description, according to the carrier structure of the planetary wheel of the present invention, it is not necessary to use a planetary shaft to make the planetary wheel freely rotatable. It can reduce man-hours and product cost.

[Brief description of the drawings]

FIG. 1, showing one embodiment of the present invention, is a longitudinal sectional side view of a carrier structure of a planetary gear.

FIG. 2, showing an embodiment of the present invention, is a front view of a carrier structure of a planetary gear.

FIG. 3, which shows a conventional example, is a longitudinal sectional side view of a carrier structure of a planetary gear.

FIG. 4 shows a conventional example, and is a front view of a carrier structure of a planetary gear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet metal carrier 1a convex part 2 Carrier plate 2a convex part 3 Mounting shaft 4 Planetary gear

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J027 FA19 GE02 GE05 GE07 GE18 GE25 3J051 AA01 BA03 BB08 BE03 ED20 3J063 AB12 AC01 BA04 BB46 BB48 CB04 CB06 CD06 XA25

Claims (4)

[Claims] In a carrier structure of a planetary wheel body, in which a plurality of planetary wheel bodies are rotatably mounted at the same distance from the axis of the carrier, a part of two sheet metal members facing each other at an interval is formed. The planetary wheel is rotatably fitted to a plurality of cylindrical projections protruding from at least one of these two sheet metal members toward the other side while being fixed and integrated as a carrier. The carrier structure of the planetary wheel. 2. The carrier structure of a planetary wheel body according to claim 1, wherein each of the planetary wheel bodies is rotatably fitted to a cylindrical projection of a sheet metal member via a bush. 3. The planetary wheel body according to claim 1, wherein the cylindrical protrusions are provided so as to face each other from positions where the two sheet metal members face each other. Carrier structure. 4. The two sheet metal members are formed by bending a plurality of portions of a peripheral portion of one sheet metal member to the other side and inserting the leading ends thereof into holes formed in the other sheet metal member. The carrier structure for a planetary wheel according to any one of claims 1 to 3, wherein the carrier structure is formed.