JPH09201004A - Method for coupling frictional speed change gear with motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably reduce the axial length of a device, simplify the coupling structure of a frictional speed change gear and a motor, and reduce the number of parts of the structure when the transmission and motor are coupled with each other. SOLUTION: At the time of coupling a motor 1 having a rotating shaft 5 which is also used for an input element 7 with a frictional change gear 3 in which a planetary transmission mechanism 21 is interposed between the input element 7 and an output element, the frame 2 of the motor 1 is united with the case 4 of the change gear 3 in one body and, at the same time, the rotating shaft 5 of the motor 1 is also used for the sun roller 22 of the change gear 3 and supported by the case 4 of the change gear 3 through a bearing mechanism composed of the plurality of planetary rollers 24, bearing rings 23, etc., of the transmission mechanism 21 on the front end side of the shaft 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction transmission and a method of connecting an electric motor for rotationally driving an input element thereof.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 51-137063 discloses
The input and output elements are mounted coaxially opposite each other in the case, and between them, the sun roller integrated with the input element, the orbit ring internally fixed to the case, and the equal angle around the sun roller. A plurality of planet rollers arranged at intervals, circumscribing the sun roller and inscribed in the orbit ring, a carrier that supports each planet roller via each planet shaft, and is integrated with an output element, and each planet. Disclosed is a friction type transmission in which a planetary transmission mechanism including a normal force generating means for applying a required normal force is interposed on each contact surface of a roller, a sun roller and an orbital ring. When connecting an electric motor having a rotary shaft which is also used as an input element to the friction type transmission, the frame of the electric motor is integrated with the case of the friction type transmission and the sun roller is connected to the rotating shaft of the electric motor. The method has been adopted conventionally.

However, in the above-described method of coupling the friction type transmission and the electric motor, the rotary shaft of the electric motor is supported by the frame of the electric motor through the respective bearings at both ends thereof, and the bearing of the case of the friction type transmission is further used as an input element. It is supported by the sun roller and the sun roller is connected to the rotating shaft of the electric motor through the connecting mechanism, etc., so that both machines can be installed in a narrow place. It was extremely difficult to significantly reduce the device length.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to greatly reduce the axial length of the device when the two machines are connected, and to simplify the connecting structure and reduce the number of parts. An object of the present invention is to provide a method for connecting a friction type transmission and an electric motor.

[0005]

According to a first aspect of the present invention, there is provided a method for coupling a friction type transmission and an electric motor, wherein an input element and an output element are coaxially supported by a case, and the case is provided between them. , A sun roller integrated with an input element, an orbital ring internally fixed to the case, a plurality of orbital rings arranged at equal angular intervals around the sun roller, circumscribing the sun roller and inscribed in the orbital ring. A method of applying a required normal force to each contact surface of a planetary roller, a carrier that supports each planetary roller via each planetary shaft and is integrated with an output element, and each planetary roller, a sun roller, and an orbital ring. When connecting a motor having a rotary shaft that is also used as an input element to a friction type transmission having a planetary transmission mechanism including a linear force generating means, the frame of the electric motor is used as a case of the friction type transmission. On earth It is characterized in that is supported on the case of the friction type transmission through a plurality of planetary rollers and the raceway ring at its front end with is, and also serves as a rotation shaft of the motor to the sun roller of the friction type transmission.

According to the combination of the two machines, the rotation of the electric motor is converted into rotation and revolution of each planetary roller through the rotation axis of the electric motor which is also used as the input element and the sun roller, and the revolution of each planetary roller is revolved. It is transmitted to the output element via the carrier. In that case, a required normal force is applied to each contact surface between each planet roller, the sun roller, and the orbital ring by the normal force generating means, whereby a tangential force that enables frictional transmission to each contact surface. Occurs.

In the structure of the friction type transmission having the planetary transmission mechanism, the orbit ring is internally fixed to the case of the friction type transmission, and the sun roller is formed by a plurality of planet rollers interposed between the orbit ring and the orbit ring. Since it is rotatably and stably positioned on the same central axis as the race ring,
The rotary shaft of the electric motor integrated with the sun roller is supported on the front end side of the friction transmission by a kind of bearing mechanism composed of a plurality of planet rollers and an orbital ring in the planetary transmission mechanism. It will be.

As described above, since the rotating shaft of the electric motor is supported by the bearing mechanism on the front end side thereof in the case of the friction type transmission, the rotating shaft of the electric motor is provided at two positions on both ends as in the prior art. It is not necessary to support the motor through the respective bearings, and in a normal case, the rotating shaft of the electric motor may be supported on the frame of the electric motor at the rear end side through the bearings. In this case, the rotating shaft of the electric motor is supported at its front end side by the bearing mechanism in the planetary transmission mechanism on the case of the friction transmission and at its rear end side by the bearing by the frame of the electric motor.

In the bearing mechanism of the planetary transmission mechanism, the outer peripheral surface of each planetary roller, the outer peripheral surface of the sun roller and the inner peripheral surface of the orbital ring frictionally engaged with the planetary roller are formed as cylindrical surfaces relatively long in the axial direction. As a result, the rotary shaft of the electric motor is stably positioned not only on the front end side but also on the same central axis as the race ring over the entire length.In this case, therefore, the rotary shaft of the electric motor is supported by the bearing in the case of the friction transmission. Only the support by the mechanism is sufficient, and the support by the bearing in the frame of the electric motor as described in claim 2 can be eliminated altogether.

According to the second aspect of the present invention, as described above, the rotating shaft of the electric motor is supported at the rear end side thereof on the frame of the electric motor through the bearing. In this case,
When the bearing interposed in the bearing of the rotating shaft of the electric motor is a rolling bearing and the outer peripheral surface of the sun roller is formed as a conical surface forming an acute angle in the direction of the output element as described in claim 3, each of them is transmitted during the transmission of the rotation of the electric motor. The pressure contact force from the planetary roller acts on the conical outer peripheral surface of the sun roller, and thereby the rotation shaft of the electric motor is biased in the direction opposite to the output element, and this biasing force acts on the rolling bearing as a preload. The rigidity of the rolling bearing against load fluctuation can be increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. [First embodiment]

FIG. 1 is a vertical sectional view of a friction type transmission and an electric motor according to a first embodiment of the present invention.
FIG. 2 is a transverse sectional view of the planetary transmission mechanism according to the first embodiment shown in FIG.

In the figure, the frame 2 of the electric motor 1 is integrated with the case 4 of the friction type transmission 3, and the rotary shaft 5 of the electric motor 1 has a seal 6 inside the case 4 of the friction type transmission 3 at its front end side. It is inserted through and serves as an input element 7 of the frictional transmission 3, and an output element 8 composed of a boss member is coaxial with the rotating shaft 5 of the electric motor 1 via a slide bearing 9 to form a case of the frictional transmission 3. 4 and a boss hole 10 for fitting and fixing an input rotary shaft (not shown) of the driven machine is coaxially formed with the output element 8 and is connected to the rotary shaft 5 of the electric motor 1 (input element 7). A planetary transmission mechanism 21 is interposed between the output element 8 and the output element 8.

The planetary transmission mechanism 21 includes a sun roller 22 formed on the front end side of the rotating shaft 5 of the electric motor 1 and an elastic orbit ring 23 internally fixed to the case 4 of the friction transmission 3.
And three planet rollers 24 (only one is shown in FIG. 1) arranged at equal angular intervals around the sun roller 22, circumscribing the sun roller 22 and inscribed in the orbit ring 23, Each planetary roller 24 is supported through a rolling bearing 25 and includes a planetary shaft 26 and a carrier 27 that supports each planetary shaft 26 and is integrated with the output element 8. Elastic deformation of the orbital ring 23 is adopted as a normal force generating means for applying a required normal force to each contact surface with 23.

In the structure of the first embodiment, the rotation input from the rotary shaft 5 of the electric motor 1 which also serves as the input element 7 is shifted through the planetary transmission mechanism 21 and is output to the output element 8. In that case, the rotating shaft 5 of the electric motor 1
Is the sun roller 22 on the front end side thereof, and is supported by the case 4 of the friction type transmission 3 by a kind of bearing mechanism including a plurality of planet rollers 24, orbital rings 23 and the like. Particularly in this embodiment, the planetary transmission mechanism 2 is used.
1, the outer peripheral surface of each planetary roller 24, the outer peripheral surface of the sun roller 22 and the inner peripheral surface of the orbital ring 23 that are frictionally engaged with the planetary roller 24 are formed in a cylindrical surface that is relatively long in the axial direction. Is extremely stably positioned on the same central axis as the race ring 23 in the case 4 of the friction transmission 3 via the bearing mechanism, so that the support by the frame 2 of the electric motor 1 is unnecessary.

[Second Embodiment] FIG. 3 is a vertical cross-sectional view of a friction type transmission and a motor according to a second embodiment of the present invention, illustrating a method of coupling the two.

The second embodiment shown in FIG. 1 is the first in the shape and structure of each planetary roller 24, orbital ring 23 and sun roller 22 of the planetary transmission mechanism 21, and the support structure of the rotary shaft 5 of the electric motor 1. It is slightly different from the embodiment.

In the planetary transmission mechanism 21 of the second embodiment, each planetary roller 24 has a flat cylindrical roller portion 24a having a large diameter which is circumscribed with the sun roller 22 and which is short in the axial direction, and is tapered outward on both sides thereof. And a raceway ring 23.
Is internally fixed to the case 4 of the friction transmission 3, and has a fixed ring portion 2 having a conical inner peripheral surface that is inscribed in the outer peripheral surface of one of the frustoconical roller portions 24b of each planetary roller 24.
3a and a movable member having a conical inner peripheral surface which is arranged so as to be displaceable in the axial direction so as to face the fixed ring portion 23a and is inscribed in the outer peripheral surface of the other truncated cone-shaped roller portion 24b of each planetary roller 24. The ring portion 23b and the movable ring portion 23b serve as the normal force generating means and the fixed ring portion 23a.
The compression coil spring 28 that presses in the direction is moved to the movable ring portion 23.
It is interposed between b and the case 4 of the friction transmission 3.

In the second embodiment, as described above, the sun roller 22 is circumscribed with the large-diameter flat cylindrical roller portion 24a having a short diameter in the axial direction of the planetary roller 24. The rotary shaft 5 of the electric motor 1, which also serves as the input element 7,
The front end side is not only supported by the case 4 of the friction type transmission 3 via the bearing mechanism in the planetary transmission mechanism 21 as in the first embodiment, but also the rear end side of the frame 2 of the electric motor 1. Is supported via a rolling bearing 29,
This stabilizes the bearing of the rotary shaft 5 of the electric motor 1.

Further, in the second embodiment, the sun roller 2
2 The outer peripheral surface is formed as a conical surface forming an acute angle in the direction of the output element 8, whereby the pressure contact force from each planetary roller 24 acts on the conical outer peripheral surface of the sun roller 22 and the rolling bearing 2
9 is provided with axial pressure.

The structure and operation and effect other than the above are the same as those of the first embodiment described above, and the description thereof will be omitted.

[0022]

Since the friction transmission and the electric motor coupling method according to the first aspect of the present invention is configured as described above,
The connection between the sun roller of the friction transmission and the rotating shaft of the electric motor is not necessary, and the bearing of the rotating shaft of the electric motor by the bearing in the frame of the electric motor can be partially or entirely omitted. At this time, the length of the device in the axial direction can be significantly reduced, the coupling structure can be simplified and the number of parts can be reduced, and the device can be downsized and the cost can be reduced.

Further, in the method of coupling the friction type transmission and the electric motor according to the second aspect of the present invention, the rotating shaft of the electric motor is supported at its front end side in the case of the friction type transmission by the bearing mechanism in the planetary transmission mechanism. Since the end side is supported by the frame of the electric motor by the bearing, when the rotational shaft of the electric motor is relatively long or when the bearing force of the electric motor rotating shaft by the bearing mechanism in the planetary transmission mechanism is small, the rotating shaft of the electric motor is It can be positioned extremely stably on the same central axis as the race ring.

Further, in the method of coupling the friction type transmission and the electric motor according to the third aspect of the present invention, since the rolling bearing associated with the bearing on the rear end side of the rotary shaft of the electric motor is axially pressurized, the rotary shaft of the electric motor is rotated. Can be rotated at high speed under low vibration and low noise.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a friction type transmission according to a first embodiment of the present invention and a motor exemplifying a coupling method for an electric motor.

FIG. 2 is a cross-sectional view of the planetary transmission mechanism according to the first embodiment shown in FIG.

FIG. 3 is a vertical cross-sectional view of a friction type transmission according to a second embodiment of the present invention and a motor exemplifying a coupling method for the electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Electric motor frame 3 Friction type transmission 4 Friction type transmission case 5 Rotating shaft 7 Input element 8 Output element 21 Planetary transmission mechanism 22 Sun roller 23 Orbital ring 24 Planetary roller

Claims (3)

[Claims] 1. An input element and an output element are supported by a case so as to be opposed to each other on a coaxial line, and a sun roller integrated with the input element, a track ring internally fixed to the case, and a sun roller are supported therebetween. A plurality of planet rollers arranged at equal angular intervals around the sun roller, circumscribing the sun roller and inscribing the orbit ring, and supporting each planet roller via each planet shaft and integrating with the output element. The friction transmission is provided with a planetary transmission mechanism including a carrier and a normal force generating means for applying a required normal force to each contact surface between each planet roller, the sun roller and the orbital ring. When connecting an electric motor having a rotating shaft that is also used as an element, the frame of the electric motor is integrated with the case of the friction type transmission,
In addition, the rotation shaft of the electric motor is also used as the sun roller of the friction type transmission, and the front end side of the electric motor is supported by the case of the friction type transmission through a plurality of planetary rollers and race rings. And how to connect the electric motor. 2. The method of coupling a friction type transmission and an electric motor according to claim 1, wherein the rotary shaft of the electric motor is supported on the frame of the electric motor at its rear end side through a bearing. 3. A friction type transmission and an electric motor according to claim 2, wherein the bearing interposed in the bearing of the rotating shaft of the electric motor is a rolling bearing, and the outer peripheral surface of the sun roller is a conical surface forming an acute angle in the direction of the output element. How to combine.