JP2553398Y2 - Phase adjustment unit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase adjusting unit using a gear type harmonic reduction gear.

[0002]

2. Description of the Related Art As a phase adjusting mechanism using a gear type harmonic transmission, the one having the structure shown in FIG. 2 is manufactured by the present applicant. As shown in FIG.
Is composed of a wave generator 2 having an elliptical inner circumference in a cylindrical shape, a flexible internal gear 3 fitted in the inside thereof, and two rigid external gears 4 and 5 mounted in the inside thereof. Gear-type harmonic reduction mechanism. One rigid external gear 4 usually has two fewer teeth than the flexible internal gear 3, and the other rigid external gear 5 has the same number of teeth as the flexible internal gear 3. Rotating shafts 6 and 7 are connected to these rigid external gears 4 and 5, respectively. Normally, the wave generator 2 is tightened by fastening bolts (not shown).
The harmonic reduction mechanism does not work. Therefore, both axes 6,
7 only functions as a coupling. When adjusting the phase of both shafts 6 and 7, the fastening bolt is loosened, the harmonic reduction mechanism is switched to a drivable state, and the wave generator is manually operated with one rigid external gear fixed. turn.
By this operation, both shafts 6 and 7 rotate relatively. Tighten the fastening bolt again at the target rotation position.

[0003]

The problem to be solved by the present invention is to realize a phase adjusting unit having a new structure that can always maintain a gear type harmonic reduction mechanism in an operating state and can perform a phase adjustment when necessary. Is to do.

[0004]

In order to solve the above-mentioned problems, in the phase adjusting unit of the present invention, the first and second wave generators each having an elliptical inner periphery are coaxially adjacent to each other. The first and second flexible internal gears having the same number of teeth are fitted inside the first and second wave generators, respectively. Inside the internal gear, first and second cylindrical first and second internal gears are formed from the first flexible internal gear to the second flexible internal gear.
And a third rigid external gear.

Here, the first and third rigid external gears located on both sides have an even number of teeth smaller than that of the first and second flexible internal gears, and the second and third rigid external gears are sandwiched therebetween. The rigid external gear has the same number of teeth as the first and second flexible internal gears. Then, both the first and second flexible internal gears bent into an elliptical shape by the wave generator mesh with the second rigid external gear located at the center at the positions of both ends of the elliptical short axis. It is.

Further, one of the first and second wave generators is supported in a non-rotatable state, and the other side is supported so as to be switchable between a non-rotatable and rotatable state. In addition to this, a rotational force input mechanism is arranged in the wave generator that can be switched between non-rotatable and rotatable.

[0007]

In the present invention, the first and third rigid external gears rotate at a rotation ratio of 1: 1. Therefore, when the input shaft and the output shaft are coupled to the first and third rigid external gears, the input and output shafts rotate at a rotation ratio of 1: 1. When adjusting the phase of the input / output shaft, one of the wave generators is rotated by a required angle via a rotational force input mechanism arranged there. In this case, an angular deviation occurs between the first and third rigid external gears, and the phase between the input and output shafts connected to the first and third rigid external gears can be adjusted.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The hollow type phase adjusting unit 10 of the present embodiment includes first and second wave generators 11 and 12 and first and second flexible internal gears 21 and 2 fitted inside these.
2 and first, second and third rigid external gears 31, 32 and 33 mounted on the inside thereof.

The first and second wave generators 11 and 12 are cylindrical bodies having the same inner periphery and the same elliptical shape, and are arranged adjacent to each other in a coaxial state. These wave generators 11 and 12
Are rigid tubular members 11a, 12a having an elliptical inner periphery.
And a ball bearing 1 fitted on these inner peripheral surfaces.
1b and 12b. First wave generator 1
1 is fixed to the unit casing 14 side, and the second wave generator 12 is rotatably supported on the unit casing 14 side via a ball bearing 15.
A thrust bearing 16 is arranged between the first and second wave generators 11 and 12.

A first flexible internal gear 21 having a cylindrical shape is fitted inside the first wave generator 11, and is bent into an elliptical shape. Similarly, a cylindrical second flexible internal gear 22 is fitted inside the second wave generator 12, and is bent into an elliptical shape.

Next, the first to third rigid external gears 31, 32 and 33 mounted inside the first and second flexible internal gears 21 and 22 have a cylindrical shape. Yes,
In this order, they are arranged concentrically from the first flexible internal gear 21 side. The tooth width of the first rigid external gear 31 is substantially half the tooth width of the flexible internal gear 21, and the first rigid external gear 31 is disposed at a position facing the outer half of the flexible internal gear 21. Similarly, the tooth width of the third rigid external gear 33 is substantially half of that of the flexible internal gear 22, and is arranged at a position facing the outer half of the flexible internal gear 22. The second rigid external gear 32 disposed between them has a tooth width extending over both the first and second flexible internal gears 21 and 22, so that both flexible internal gears 21 and 22 are in a state of facing the inner half portion.

The input shaft 17 is coaxially connected to the outer annular end face 31a of the first rigid external gear 31. On the outer annular end face 33a of the third rigid external gear 33,
The output shaft 18 is coaxially connected. On the other hand, the outer peripheral surface of the rigid tubular member 12a of the second wave generator 12 is a perfect circle, on which the external teeth 12c are formed. The external teeth 12c are connected to a rotary drive source via a gear train (not shown).

The operation of the hollow type phase adjusting unit 10 having this configuration will be described. The second wave generator 12 in this unit 10 is normally kept in a non-rotatable state. When the input shaft 17 is rotated in this state, the first rigid external gear to which the input shaft 17 is connected rotates integrally. The input rotation is performed by the first flexible internal gear 21 and the second rigid external gear 32 and the second
Is extracted from the third rigid external gear 33 through the flexible internal gear 22 as an output rotation having a rotation ratio of 1: 1. Therefore, the output shaft 18 connected to the third rigid external gear 33 rotates with the input shaft 17 at a rotation ratio of 1: 1. That is, in this state, although each part of the unit 10 operates, it functions as a coupling between the input and output axes.

Next, the operation for adjusting the phase of the input / output shafts 17 and 18 will be described. In this case, the rotational force from a rotational drive source (not shown) is transmitted to the external teeth 12c of the second wave generator 12 via a gear train (not shown), so that the second wave generator 12 Rotate by the angle you want. In this way, the third rigid external gear 33 is angularly displaced by a fixed amount with respect to the first rigid external gear 31. Therefore, the second
By rotating the wave generator 12 by a required angle and returning the wave generator 12 to the fixed state again at the rotation position, the phases of the input / output shafts 17 and 18 can be adjusted.

In this embodiment, the phase of the input / output shaft is adjusted by rotating the side of the second wave generator 12, but the phase is adjusted by rotating the wave generator 11 of the first side. May be configured to be performed. Further, in order to rotate the wave generator, the external teeth 12c are formed on the outer periphery in this example, but it is needless to say that the wave generator may be rotated by adopting another configuration. It is. Further, in the present embodiment, the hollow portion is formed by using a cylindrical shape as the first to third rigid external gears. However, when the hollow portion is not required, a disk-shaped rigid external gear is used. Should be used.

[0017]

As described above, in the phase adjustment unit of the present invention, the gear type harmonic reduction mechanism incorporated therein is always in the operating state, and the phase adjustment unit rotates without switching the operation to the enabled or disabled state. Both force transmission and phase adjustment can be performed. Further, the phase adjustment can be easily performed by transmitting a rotational force from the outside of the unit to a rotation input section (the external teeth 12c in the above example) formed in the wave generator. Further, when a hollow portion is formed in the center of the unit, there is an advantage that this portion can be used as a wiring space or the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a hollow type phase adjustment unit according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional phase adjustment unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Hollow type phase adjustment unit 11 ... 1st wave generator 12 ... 2nd wave generator 12c ... External teeth 14 ... Unit casing 15, 16 ... Bearing 17 ... input shaft 18 ... output shaft 21 ... first flexible internal gear 22 ... second flexible internal gear 31 ... first rigid external gear 32 ... 2nd rigid external gear 33 ... 3rd rigid external gear

Claims (2)

(57) [Scope of request for utility model registration] 1. A first and a second cylinder having an inner periphery in an elliptical cylindrical shape.
Are arranged coaxially adjacent to each other, and inside the first and second wave generators, cylindrical first and second flexible internal gears having the same number of teeth are fitted, respectively. Inside these first and second flexible internal gears,
From the side of the first flexible internal gear to the side of the second flexible internal gear, first, second and third rigid external gears are mounted, and the first and third rigid external gears are mounted. The rigid external gear is the first external gear.
And the second rigid external gear has the same number of teeth as the first and second flexible internal gears, and the second rigid external gear has the same number of teeth as the first and second flexible internal gears. The first and second flexible internal gears, which are bent elliptically by the first and second wave generators, have an elliptical short axis with respect to the first and third rigid external gears, respectively. The first and second flexible internal gears are meshed at both ends of an elliptical short axis with respect to the second rigid external gear, and the first and second flexible internal gears are meshed at both ends. One side of the second wave generator is supported in a non-rotatable state, and the other side is switchably supported in a non-rotatable and rotatable state, and is switchable between the non-rotatable and rotatable state. A simple wave generator has a rotational force input mechanism to rotate it. Phase adjustment unit, wherein Rukoto. 2. The hollow phase adjustment unit according to claim 1, wherein the first to third rigid external gears are formed in a cylindrical shape, and a hollow portion penetrating the center of the unit is formed.