JPH01108441A - Differential gear mechanism - Google Patents

Abstract

PURPOSE:To enhance the rotational accuracy and to aim at enhancing the transmission torque by external teeth in a differential gear mechanism in which displacement is taken from internal tooth members, by dividingly forming external teeth formed in an external tooth member, for every inner tooth member. CONSTITUTION:A flexible external tooth gear 13 is fitted on the outer periphery of an eccentric member 11 through a bearing 12. External teeth formed in the outer periphery of the external gear 13 are divided axially into parts 13A1, 13A2, respectively for internal tooth gears 14, 15. The external tooth part 13A1 is meshed with internal teeth 14A formed in the inner periphery of the internal tooth gear 15 while the external tooth part 13A2 is meshed with internal teeth 15A formed in the inner periphery of the internal tooth gear 15. Since the external teeth of the external tooth gear 13 is divided, both external tooth parts 13A1, 13A2 are meshed with the internal tooth gears 4, 5 over the whole surface of each tooth. With this arrangement, it is possible to enhance the rotational accuracy and to aim at enhancing the transmission torque by the external teeth.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a differential tooth rrL used in a differential gear reducer, etc.
Regarding rock formations.

(Prior art) A so-called differential gear in which an elastically deformable external gear is meshed with an internal gear to obtain a relative displacement equal to the difference in the number of teeth between the inner and outer teeth, and this displacement is extracted as rotation. Gear reduction gearboxes are well known in the art, and there are various types of gear reduction gearboxes.

It consists of two internal teeth 111 with different numbers of teeth and a flexible external gear that meshes with the two internal gears, and one of the two external teeth Jμ is fixed. and the other is held rotatably, and the two internal gears are made rotatable by taking advantage of the fact that when the external gear meshes with the two internal gears, the two internal gears are out of phase with each other by the difference in the number of teeth. For example, the Harmoninck Drive Reducer (Reed) is known as a device that extracts the reduced rotation from the 1st edition of the original.

Hereinafter, the conventionally known harmonic drive reducer will be explained with reference to the drawings.

Referring to FIGS. 3 and 4, a ring-shaped flexible external gear 3 is fitted on the outer periphery of an eccentric body 1 rotated by a rotating shaft (not shown) via a bearing 2. There is. Internal gear 4 and internal teeth 1' that mesh with this external gear 3 ¥15
is provided on the outer periphery of the external tooth 113. Internal tooth I'1
14 is fixed, and the internal gear 5 is rotatably held. The number of teeth of the internal tooth I$t4 and the number of teeth of the internal gear 5 are different from each other. The external teeth 3A formed on the outer periphery of the external gear 3 extend linearly in the axial direction and are formed with only one peak, and the external teeth 3A are similar to the internal teeth 4A formed on the inner periphery of the internal gear 4. and internal teeth 5A formed on the inner periphery of the internal gear 5.

Its action is as follows.

When the eccentric body 1 rotates, the external gear 3 meshes with the internal gear 4 and the internal tooth r#5 without being deformed. During one rotation, the phase of the internal gear 5 is shifted by the difference in the number of teeth between the internal and external gears 4 and 5, so the rotation of the internal gear 5 by that phase difference is
taken from.

(The problem that Katsuaki tries to solve) In the meshing between the external gear 3 and the internal gear 4.5, as can be seen from FIG. 4, the external gear 11113 and the internal gear 4
The tangential force T of the meshing between the external gear 3 and the internal gear 5 and the tangential force T2 of the meshing between the external gear 3 and the internal gear 5 act on the external teeth 3A of the external gear 3 from mutually opposite directions.

In the conventionally known external gear 3, the external teeth 3A are formed as a single peak extending in the axial direction, so that the joint between the part that meshes with the internal gear 4 and the part that meshes with the internal gear 5 There was a risk that twisting would occur in K, resulting in poor tooth contact and a decrease in accuracy.

In addition, in the deformed state as shown in 2, only part 1 and 2 of the external tooth 3A come into contact with the internal teeth 4A and 5A of the internal gear 4.5, and a local force is applied to the external tooth 3A. This caused strength problems.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a differential gear mechanism that improves the above-mentioned drawbacks, improves rotational accuracy, and improves transmission torque through external teeth.

The feature of the present invention is that it consists of two internally toothed members having different numbers of teeth and a flexible externally toothed member that meshes with the two internally toothed members. One of the inner teeth is fixed, the other is held movable, and when the outer tooth member meshes with the two inner tooth members, the two inner tooth members are relatively out of phase by the difference in the number of teeth. In the differential gear mechanism in which displacement is taken out from an internally toothed member held so as to be displaceable, the external teeth formed on the externally toothed member are formed separately for each internally toothed member.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Referring to Figures M1 and F52, a ring-shaped flexible external gear 13 is fitted via a bearing 12 to the outer periphery of an eccentric body 11 that is rotated by a rotating shaft (not shown). . An internal gear 14 and an internal gear 15 that mesh with the external gear 13 are provided on the outer periphery of the external gear 13. The internal gear 14 is fixed, and the internal gear 15 is rotatably held. Number of teeth of internal tooth 11114 and internal tooth 4L
The number of teeth of the 15 teeth is different from each other. The external teeth formed on the outer periphery of the external gear 13 are divided in the axial direction into 3A and 3A2 for every internal gear 14.15, and both are formed to extend linearly in the axial direction. The external teeth 3A mesh with internal teeth 4A formed on the inner periphery of the internal gear 4, and the external teeth 3A2 mesh with internal teeth 5A formed on the inner periphery of the internal teeth lft5.

In the external gear 13 according to the present invention, the external teeth are divided, so as can be seen from FIG.
Both A2 mesh with the internal gear 4.5 on the entire surface of the teeth.

The above is one embodiment of the present invention, and the present invention is not limited to the above embodiment.

For example, in a differential gear mechanism, as shown in FIG.
4, one rack 23 is fixed, the other rack 24 is movable, and the rack 23.2.
It also includes a positioning control mechanism that extracts the relative displacement of the racks 23 and 24 due to the difference in the number of teeth of t.
The external toothed member of the present invention can also be applied to a toothed belt in the positioning process.

(Effects of the Invention) Since the present invention is configured as described above, it produces the following effects.

Since the external teeth and internal teeth are in contact with each other on the entire surface of the tooth, external teeth 1■ with high rotational accuracy and large load capacity can be obtained, and are compact and have a high load capacity for precision reduction (or precision positioning). The result is Isozuri.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a drawing of differential teeth *a showing an embodiment of the present invention, Fig. 2 is a front view showing the meshing of the external gear and internal gear in Fig. 1, and Fig. 3 is a conventional FIG. 4 is a sectional view showing the known Harmonic 1-Live Rock Groove, FIG. 4 is a front view showing the engagement between the external gear and the internal gear in FIG. 3, and FIG. 5 is an example of the positioning device to which the present invention is applied. It is a schematic front view shown. 11: Eccentric body 12: Bearing 13: For external teeth 13 Al
, 13 A2: External tooth 14: Internal gear 14A: Internal tooth 15: Internal tooth Jll 14Δ: Internal tooth Patent attorney Mibe Tsuji (1 person) Fig. 1 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] Consisting of two internally toothed members with different numbers of teeth and a flexible externally toothed member that meshes with the two internally toothed members, one of the two externally toothed members is fixed and the other is movable. and by utilizing the fact that when the external toothed member meshes with the two internal toothed members, the two internal toothed members are relatively out of phase by the difference in the number of teeth,
A differential gear mechanism configured to extract displacement from an internally toothed member that is held displaceably, characterized in that external teeth formed on the externally toothed member are formed separately for each internally toothed member. mechanism.