JPH07158701A - Epicycle reduction gear - Google Patents

Abstract

PURPOSE:To provide an epicycle reduction gear, which has a compact form in the direction of a shaft, and which is free from backlash. CONSTITUTION:A first reduction mechanism on an input side and an epicycle reduction mechanism on an output side are arranged in the same box, and the first reduction mechanism is formed exchangeable on the input side of a box body 1. The epicycle reduction mechanism is divided into halves on a vertical plane with internal gears 11, 12 serving as axes and the divided internal gears 11, 12 are displaced from one another along the vertical plane, so as to eliminate any backlash between them and an epicyclic gear 9. A bearing is provided between the outer periphery of a carrier 10 for holding the epicyclic gear 9 and the inner surface of the box body 1, so as to shorten the entire length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer using a planetary gear.

[0002]

2. Description of the Related Art Heretofore, a planetary gear reducer has been generally used as a means for achieving a small size and a low reduction ratio to a high reduction ratio. This reduction gear generally drives a planetary gear mechanism via a coupling or a transmission means such as a belt or a chain between the reduction gear and a drive source such as an electric motor.

[0003]

However, there is a problem that the above-mentioned front stage speed reduction mechanism makes the axial length as a whole longer, which makes it difficult to use for small equipment and the like. or,
On the output side, two bearings are arranged on the output shaft that is connected to the carrier that holds the planetary gears, so even in this case, the overall length is lengthened.

Further, since no backlash removing method is generally taken, some backlash exists between the input shaft and the output shaft.

The present invention solves the above problems by providing a small size,
Another object of the present invention is to provide a planetary gear reducer in which backlash is removed.

[0006]

In order to solve the above-mentioned problems, an input side first reduction gear mechanism and an output side planetary reduction gear mechanism are arranged in the same casing, and the first reduction gear mechanism is the casing 1. It is exchangeably fixed to the coaxial type and the orthogonal axis type on the input side of.

The first reduction gear mechanism is a two-stage reduction spur gear, which is constructed so that the input shaft 2a and the output shaft 13 are positioned on a straight line, and the bevel gear, and the input shaft 2a and the output shaft 13 are Some are configured to be orthogonal.

The planetary reduction mechanism divides the outer circumference of the internal gear into two parts on a plane perpendicular to the axis, and shifts the divided two internal gears 11, 12 along the vertical surface to prevent backlash between the planetary gears 9. It is configured to be removed.

The carrier 10 for holding the planetary gears 9 has a bearing arranged between its outer circumference and the inner circumference of the housing and between the output shaft 13 and the housing 1 to shorten the whole in the axial direction. .

[0010]

Since the speed reduction mechanism at the preceding stage is incorporated in the housing 1, the drive source 2 which rotates at high speed can be directly connected.
Also, due to the backlash removal mechanism provided between the internal gears,
You can almost eliminate the total backlash.

[0011]

1 is a sectional view of a linear planetary gear reducer of the present invention. In this example, the housing 1 is the first housing 1a at the front stage.
And a second housing 1b and a lid portion 1c in the subsequent stage.
A drive source 2 such as an electric motor is fixed to the lid portion 1c, and a first gear 3 of the drive source 2 and a second gear 4 and a coaxial third gear 5 that mesh with the first gear 3 of the drive source 2 are provided in the first housing 1a. Both ends are fixed to a shaft whose both ends are supported by the casing 1a and the lid portion 1c.

Further, the drive shaft 2a of the drive source 2 and the second housing 1b
A fourth gear 7 meshing with the third gear 5 and a sun gear 8 in the second housing 1b are fixed to a central shaft 6 axially supported in the extension direction of the drive shaft 2a.

A planetary gear 9 is rotatably supported on the sun gear 8 at three to four positions of a carrier 10, and the planetary gear 9 is further sandwiched between a first casing 1a and a second casing 1b. It is configured to mesh with the internal gear 11 and the second internal gear 12 so that planetary movement is possible.

In this case, the first internal gear 11 is the first casing 1a.
The second internal gear 12 is fixed to the first internal gear 11 such that the second internal gear 12 can be slightly displaced in the rotational direction with respect to the first internal gear 11. FIG. 3 shows this state.

The planetary gear 9 is rotatably supported on the carrier 10. The carrier 10 is rotatably supported between the outer circumference of the carrier 10 and the second casing 1b and between the output shaft 13 and the second casing 1b. is there.

The operation of this planetary gear reducer is basically the same as that of the conventional planetary gear reducer, but the major difference is that the internal gear meshing with the planetary gear 9 is the first as shown in FIG. The first and second internal gears 11 and 12 are configured to be slightly displaced from each other so that the teeth of the planetary gear 9 are sandwiched by the internal gears. It is configured to remove rush.

In addition to the above, the planetary gear 9 has a plurality of three to four gears meshing with the sun gear 8, and between the first gear 3 and the second gear 4 and between the third gear 5 and the fourth gear 7. Since it is a helical gear, it is easy to make a precise rotation mechanism without backlash.

FIG. 2 is a sectional view of the L-shaped planetary gear reducer of the present invention. In this example, the planetary gear portion is the same as that of the linear type of FIG. 1, so description of this portion will be omitted, and only the portion on the drive source side will be described. A large-diameter second bevel gear 21 is fixed to the first casing side of the central shaft 6 that holds the sun gear 8, and the drive source 2 is fixed to the lateral surface of the second casing 1b. The first bevel gear 20 having a small diameter is fixed to the shaft 2a so that the first bevel gear 20 and the second bevel gear 21 mesh with each other.

[0019]

As described above, by changing the mounting direction of the drive source 2 to the first housing 1a, it is easy to change between the linear type and the L-shaped type, and it is easy to change depending on the place of use. Can be done. However, it is necessary to change the spur gear and the bevel gear for two-step reduction at the same time.

Although the shape of the first casing 1a is slightly different between the case of FIG. 1 and the case of FIG. 2, it is possible to convert them.

Since the speed reducing mechanism before the planetary speed reducing mechanism is housed inside the housing 1, the length in the central axis direction is shortened and it can be used for small equipment.

Since the output shaft 13 integrated with the carrier 10 is also provided with a bearing on the outer periphery of the carrier 10, the length in the central axis direction is shortened, and the output shaft 13 can be used for a more compact device.

The planetary gear 9 and the first and second internal gears 11, 1
Since a backlash removing mechanism is provided between the two, almost all the backlash can be removed.

[Brief description of drawings]

FIG. 1 is a sectional view of a linear planetary gear reducer according to the present invention.

FIG. 2 is a cross-sectional view of an L-shaped planetary gear reducer of the present invention.

FIG. 3 is an explanatory diagram of a backlash removing mechanism.

[Explanation of symbols]

 1 case 1a 1st case 1b 2nd case 2 drive source 2a drive shaft 3 first gear 4 second gear 5 third gear 6 center axis 7 fourth gear 8 sun gear 9 planetary gear 10 carrier 11 first inside Gear 12 Second internal gear 13 Output shaft 20 First bevel gear 21 Second bevel gear

Claims (5)

[Claims] 1. In a planetary gear reducer, an input-side first reduction gear mechanism and an output-side planetary reduction gear mechanism are arranged in the same housing, and the first reduction gear mechanism is replaceable on the input side of the housing. A planetary gear reducer characterized by being fixed to. 2. The first reduction mechanism is a two-stage reduction spur gear,
The planetary gear reducer according to claim 1, wherein the input shaft and the output shaft are arranged so as to be aligned with each other. 3. The planetary gear reducer according to claim 1, wherein the first reduction gear mechanism is a bevel gear, and the input shaft and the output shaft are orthogonal to each other. 4. The planetary reduction mechanism divides the outer periphery of the internal gear into two parts on a plane perpendicular to the axis, and shifts the divided two internal gears along the vertical surface to prevent backlash between the planetary gears. The planetary gear reducer according to claim 1, wherein the planetary gear reducer is configured to be removed. 5. A carrier for holding a planetary gear is configured such that bearings are arranged between the outer circumference of the carrier and the inner circumference of the housing and between the output shaft and the housing to shorten the whole in the axial direction. The planetary gear reducer according to claim 1.