JPS6138242A - Accelerating/decelerating device of planetary gear - Google Patents

Abstract

PURPOSE:To make a device small-sized and lightweight by double-supporting an input shaft and forming a drive in a cylindrical shape. CONSTITUTION:A recess 31 is provided on an output shaft 30, an inner spline hole 32 concentric with an input shaft 21 is provided on the recess 31, a cylindrical drive 35 having a through hole 36 inside it is floatingly supported between this inner spline hole 32 and an inner spline hole 29 provided on a carrier section 28 made in one body with an outer bearing 24, and the input shaft 21 is pivotally supported in the recess 31 of the output shaft 30 by piercing the through hole 36 of the drive 35. Accordingly, the input shaft can be double- supported, thereby bearings 37, 38 supporting the input shaft 21 can be made small-sized, and the input shaft 21 and an input shaft casing can be made small- sized and simplified. In addition, the drive 35 is cylindrical, thus it can be made lightweight.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement of a planetary gear device in which an internal gear is made of a pin or a combination of a pin and a roller, and an external gear is made of a trochoid tooth profile. relates to an improvement in a planetary gear train having a universal joint connection.

(Prior Art) A conventional planetary gear reducer will be described with reference to FIGS. 3 and 4.

In this known planetary gear reducer, rotation input from an input shaft 1 is reduced in speed and applied to an output shaft 2.

The mechanism for this deceleration is as follows.

An eccentric body 33.3□ is provided on the input shaft 1 with a predetermined phase difference (180° in this example). each eccentric body 3
8.32 is connected to the external gear 51.5 through the roller 4. It is in contact with A plurality of inner roller holes 6 are provided in the outer tooth lL5 52, into which the inner pin 7 and the inner roller 8 are fitted. External teeth 9 such as a trochoid or an arc are provided on the outer periphery of the external gear 51.5□, and the external pins 11 provided on the internal gear 10 mesh with the external teeth 9.

The inner bottle 7 is fixed or fitted into the 7-run section 12 of the output shaft 2.

In this known example, one revolution of the input shaft 1 corresponds to 38.32 degrees of the eccentric body.
However, the external gears 51 and 52 rotate through the inner roller hole 6.
Since the rotation is restrained by the inner pin 7 and the rotation is oscillated, if the difference between the number of teeth of the external gears 51 and 52 and the number of outer pins 11 (the number of teeth) is 1, the input shaft 1 One rotation causes the external teeth 9 of the external gears 51, 52 and the external pin 11, which is the internal tooth of the internal gear 10, to engage and displace (shift) by one tooth. Therefore, one rotation of the input shaft 1 is made by the external gear 53.52
The rotation is reduced to 1/the number of teeth, and the rotation is transmitted to the output shaft 2 via the inner pin 7.

(Problem that the invention attempts to solve) The planetary gear mechanism described above has the following problems.

A power transmission mechanism including the inner roller hole 6, the inner pin 7, and the inner port 28 applies a load to the output shaft 2 in the radial direction. For this reason, it is necessary to provide a sturdy seven-run section 12 to prevent deformation of the output shaft 2, and the vicinity of the output shaft 2 cannot be made compact in the radial direction. In addition, the power transmission mechanism using the inner roller hole 6, inner bottle 7, and inner roller 8 requires high-precision machining.
In addition, since even a slight deformation has an adverse effect, appropriate rigidity is also required.

The presence of the inner roller hole 6 occupies a large space in the external gear 51.5□, which becomes an obstacle to miniaturization of the external gear 51.52, and ultimately becomes a difficulty in miniaturizing the entire device.

On the other hand, there is also a known mechanism in which a carrier is attached to the internal gear and the carrier and the output shaft are connected by an intermediate drive gear so that no load is applied to the output shaft in the radial direction. Since it is in a cantilevered state, the load on the bearing that receives the load of the input shaft is large, and therefore the input side casing cannot be made compact.

The purpose of the present invention is to improve the above-mentioned drawbacks, to achieve simplification and miniaturization of the input shaft side with a simple mechanism, and to provide a planetary gear that is short in the axial direction and simplified and miniaturized of the output shaft side. It provides quick preparation.

(Means for Solving Problems) The present invention is characterized by an external gear mounted on an input shaft via an eccentric body, and an internal gear concentric with the output shaft that meshes with the external gear. a planetary gear device comprising: a recess provided in the output shaft; a spline hole or spline provided in the recess concentrically with the output shaft; a carrier provided in the external gear; A spline hole or spline is provided concentrically with the output shaft, and the spline hole or spline of the output shaft and the spline hole or spline of the external gear are connected by a drive having splines or spline holes at both ends, and the drive is connected to the spline hole or spline inside. It has a cylindrical shape with a through hole, and the input shaft is inserted through the through hole of the drive and is supported within the recess of the output shaft.

(Example) This will be explained in detail below with reference to the drawings.

FIG. 1.2 shows an embodiment of the present invention, in which an eccentric body 22 having an eccentricity C is formed on the input shaft 21, and an external gear 24 is connected to the eccentric body 22 via a bearing 23. It is installed. Therefore, the axis 02 of the external gear 24 is located at the input shaft 21 (
It is mounted eccentrically by e with respect to the axis 01 of the internal gear 26). The external teeth 25 of the external gear 24 have an appropriate tooth profile such as a trochoidal tooth profile or an arc tooth profile, and mesh with the internal teeth of the external pin 27 of the internal gear 26 . The external gear 24 is integrally provided with a carrier portion 28, and the carrier portion 28 is provided with an internal spline hole 29 concentric with the external gear 24.

On the other hand, the output shaft 30 is provided with a recess 31, and the recess 31 is provided with an inner spline hole 32 concentric with the input shaft 21, and between each of the inner spline holes 29 and 32. A drive 35 is provided having floatingly supported external splines 33,34.

The drive 35 has a cylindrical shape and has a through hole 36 inside. The input shaft 21 is inserted through the through hole 36 of the drive 35 and is supported by a bearing 37 within the recess 31 of the output shaft 30 .

Therefore, the input shaft 21 has bearings 37 on both sides of the external gear 24.
and are supported on both sides by bearings 38.

The internal gear 26 has an elongated cylindrical shape and is integrated with the output shaft casing, and is fixed to the input shaft casing 39 by a pin 40. The output shaft 30 is supported by a bearing 41 on the cylindrical length of the internal gear 26 .

The operation of the planetary gear-mounted speed generator of the present invention constructed as described above will be described.

The eccentric body 22 is rotated by the rotation of the input shaft 21, and the bearing 2
3 to the external gear 24. At this time, the axis O3 of the input shaft 21 and the rotation axis 02 of the external gear 24 are eccentric by e, and the external gear 24 is connected to the drive 35 which is floatingly supported via the carrier part 28. Therefore, the revolution movement of the input shaft 21 of the external gear 24 around the axis 01 is absorbed by the swinging movement of the drive 35, and only the rotation of the input shaft 21 is caused by the meshing of the external gear 24 and the external pin 27. The rotation of the external gear 24 is transmitted to the drive 35 via the carrier portion 28, and from the drive 25 to the output shaft 30.

The load acting on the input shaft 26 is applied to the input shaft 26 via the external gear 24, but there are bearings 37 and 38 on both sides of the input shaft 26.
are provided and are supported on both sides, so each bearing 3
The load acting on 7.38 becomes lighter, and the bearing 37.38 can be made smaller.

Although the above description has been made regarding a speed reducer, the present invention can also be applied to a speed increaser.

The effects of the present invention, which is constructed and operated as described above, are listed below.

Since the input shaft is supported on both sides, the bearing supporting the input shaft can be downsized, and the input shaft and input shaft casing can be downsized and simplified.

Since the drive is cylindrical, it can be lightweight.

Since the drive is floating relative to the carrier and output shaft, machining errors are absorbed and machining accuracy is not required as much.

Further, since no inner roller hole is required, the space in the radial direction of the external gear is saved, and the reduction gear can be made smaller.

Since only torque is transmitted to the output shaft and no radial load acts, angular backlash is reduced based on deformation.

If the external gear is made into a cylinder and is integrated with the output shaft casing, the output side can be downsized and simplified. 2. Since there is no bolt connection, large torque can be transmitted.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
3 is a sectional view showing an example of a conventional device, and FIG. 4 is a sectional view taken along A-A in FIG. 3. 21: Input shaft, 22: Eccentric body, 23: Bearing,
24: External gear, 26: Internal gear, 28: Carrier section, 30: Output shaft, 35 Nidrive,
36: Through hole 37. 38: Bearing sub-agent Patent attorney Sanbe Tsuji

Claims (1)

[Claims] In a planetary gear device having an external gear mounted on an input shaft via an eccentric, and an internal gear concentric with an output shaft that meshes with the external gear, a recess is provided in the output shaft, and the recess A spline hole or spline is provided in the output shaft concentrically with the output shaft, a carrier is provided in the external gear, a spline hole or spline is provided in the carrier concentrically with the external gear, and the spline hole or spline of the output shaft and the The spline holes or splines of the external gear are connected by a drive having splines or spline holes at both ends, and the drive has a cylindrical shape with a through hole inside, and the input shaft connects to the through hole of the drive. A planetary gear device, characterized in that the output shaft is supported in a recess through which the output shaft is inserted.