JPH0218678Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a flat type motor in which a stator with a winding on an iron core and a rotor with magnetic poles on a yoke are opposed in the axial direction. The present invention relates to a structure in which a speed reducer is provided without increasing the axial dimension.

[Prior Art] An axial air motor is characterized by a short axial dimension, but has the disadvantage that the axial dimension increases if a reduction gear is provided depending on the load. In addition, in a DC motor equipped with a rotor made up of printed wiring, there is a large space inside the rotor as shown in Publication No. 10419/1971, so a reduction gear can be built into this part, but the magnetic poles and A rotor with a yoke has a large bearing portion due to its large weight, and there is no space to incorporate a reduction gear, so a reduction gear is separately attached to the output shaft side.

[Problem to be solved by the present invention] For this reason, even if it is a flat type motor, the axial length increases by providing a reduction gear.
When the motor is used alone, the advantage of having a small axial dimension can be fully utilized, but when a reduction gear is required, this advantage is not utilized and the axial installation space becomes large.

[Means for solving the problem] For this reason, the present invention provides an elliptical rotating body on the outer periphery of the rotor, incorporates a harmonic reduction mechanism, and connects a fixed spline that meshes with a flexible spline driven by the elliptical rotating body to its outer diameter. is made larger than the outer diameter of the rotor and is supported by a mounting seat of the outer frame, and the movable spline is arranged close to the fixed spline inside the mounting seat.

[Function] Therefore, the space between the rotor and the reducer becomes smaller, and the fixed spline and movable spline of the reducer itself are brought closer to each other to reduce the axial dimension, making it easier to arrange the rotor in the space around the outer circumference of the rotor. It becomes possible.

[Example] This will be explained with reference to an embodiment shown in the drawings.

1 is an outer frame, 2 and 3 are brackets, 4 is a stator core fixed to bracket 2, 5 is a stator winding,
Reference numeral 6 denotes a rotary shaft supported by the bracket 2 via a bearing 7, 8 a rotor fixed to the rotary shaft 6, and 9 a magnetic pole attached to the rotor, which is connected to the stator core 4 through an axial space. They are facing each other. 10 is rotor 8
The elliptical rotating body is integrally fixed to the side surface of the elliptical rotating body, 11 is a flexible spline that is fitted and supported on the outer peripheral surface of the elliptical rotating body, and is held so as to be able to slide along the outer periphery of the elliptical rotating body via balls 12. There is. Reference numeral 13 denotes a circular fixed spline with internal teeth that mesh with the flexible spline 11, which has a large outer diameter and is attached to the mounting seat 14 of the outer frame 1 outside the rotor 8 with a ball 15. Reference numeral 16 denotes a circular movable spline with internal teeth that mesh with the flexible spline 11. The number of teeth is slightly different from that of the fixed spline 13, and the outer diameter is made smaller than the inner diameter of the mounting seat 14. It is attached to the output shaft 17 with a bolt 18 inside the output shaft 14. A bearing 19 supports the output shaft 17 on the bracket 3.

When the stator winding 5 is excited, the rotor 8 rotates at high speed, and the elliptical rotating body 10 rotates at the same speed. Therefore, the meshing position between the flexible spline 11, the fixed spline 13, and the movable spline 16 moves as the elliptical rotating body 10 rotates, and the movable spline 16 rotates according to the difference in the number of teeth with the fixed spline 13. The output shaft 17 is rotated at a low speed corresponding to the difference in the number of teeth.

Therefore, in this proposal, the outer diameter of the fixed spline 13 is increased, and the mounting seat 1 of the outer frame 1 is located near the outer periphery.
4, the attachment part with the bolt 15 is on the outside of the rotor 8, and the axial gap between the rotor 8 and the fixed spline 13 can be reduced, and the movable spline 16 has a smaller diameter than the fixed spline 13. and is fixed to the output shaft 17 with a mounting bolt 18, so that it is placed inside the mounting seat 14,
The flexible spline 11 can be provided close to the fixed spline 13 with a small distance therebetween, the width of the flexible spline 11 can also be reduced, and the axial dimension of the entire speed reducer can be configured to be small.

In Fig. 2, the rotor 8 has an elliptical outer diameter and an elliptical rotating body 10 is integrally constructed.A fixed spline 13 and a movable spline 16 are arranged on the outer periphery of the rotor 8, and the axial dimension of the rotor is This makes it possible to almost eliminate an increase in the axial dimension due to the reduction gear.

[Effects of the present invention] In this way, the present invention has a stator with windings on the iron core and a rotor with magnetic poles on the yoke, which are spaced in the axial direction.
In the flat type motor, which is opposed to each other at A harmonic reduction mechanism is constructed by arranging a fixed spline and a movable spline, the fixed spline has an outer diameter larger than that of the movable spline and is attached to the mounting seat on the inner surface of the outer frame, and the movable spline has a smaller diameter and is attached to the mounting seat. Since the movable spline is attached to the output shaft inside the rotor, the axial dimension of the reduction gear can be reduced by bringing the movable spline close to the fixed spline, and since it is attached to the outer periphery of the rotor, the axial dimension of the motor as a whole can be reduced. It is short and can provide large deceleration without sacrificing the features of a flat type motor.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a side sectional view of another embodiment. 1 is the outer frame, 4 is the stator core, 5 is the stator winding,
6 is a rotating shaft, 8 is a rotor, 9 is a magnetic pole, 10 is an elliptical rotating body, 11 is a flexible spline, 13 is a fixed spline, 14 is a mounting seat, 16 is a movable spline,
17 is an output shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A flat type motor in which a stator having a winding on an iron core and a rotor having magnetic poles on a yoke are opposed to each other with an axial space in the outer frame 1. , an elliptical rotating body coaxially provided integrally with the rotor, a flexible spline fitted and supported on the outer periphery of the elliptical rotating body via a ball, and a fixed member provided with internal teeth meshing with the flexible spline. A speed reducer is provided with a spline and a movable spline, and the number of teeth of the fixed spline and the movable spline are slightly different, and the outer diameter of the fixed spline of the speed reducer is larger than the outer diameter of the rotor so that the inner surface of the outer frame is 1. A flat type motor with a speed reducer, characterized in that the motor is supported by a mounting seat provided in the motor, and a movable spline is disposed close to a fixed spline and inside the mounting seat. 2. A flat type motor with a speed reducer according to claim 1, wherein the elliptical rotating body is constituted by the outer peripheral surface of a rotor.