JPS6030863B2 - Friction continuously variable transmission - Google Patents

Description

[Detailed description of the invention] A transmission system from an input shaft to an output shaft includes a plurality of planetary trochanters that perform planetary motion, and one speed change ring that is commonly frictionally engaged with the conical surface of these planetary trochanters. Friction continuously variable transmissions, in which the speed is changed by moving the speed change ring in the direction of the center line, and the rotation of the speed change ring is transmitted to the output shaft, can perform speed changes easily and are useful for automatic transmission of various machines. It can be suitably used for controlled driving.

Automatic control devices using this device usually include a speed detection means such as a speed generator on the output shaft of the transmission or the shaft of the machine driven by the transmission, and the detected shaft If there is a deviation ΔN between the rotational speed N and the desired rotational speed No, the speed change operating means is automatically moved so as to set the deviation ΔN to 0. For program control or follow-up control. In the case of constant speed control, No is a changing value, but in the case of constant speed control, No is a constant value. The present invention improves spatial conditions by eliminating the need to attach the speed detection means to the output shaft or other machine shaft, and
The purpose of this invention is to improve responsiveness during automatic control, and the present invention will be described with reference to the drawings as follows.

In FIG. 1, 1 is an electric motor, 2 is its output shaft, and the output shaft 2 is directly connected to an input shaft 3 of a continuously variable transmission mechanism.

The transmission system from the input shaft 3 to the output shaft 4 includes a transmission wheel 5, a plurality of conical rotors 6 that perform planetary motion, an orbital ring 7, a speed change ring 8, and a cylindrical portion 9 integrated with the speed change ring 8. , a ball spline 10, a force generating device 11, a thrust bearing 12 for transmitting force after pressure, etc. are provided. The present invention provides an external gear 20 on the speed change ring 8 or a member integrated therein.
The main part of the present invention is shown in an enlarged scale in FIG. 2.

In FIGS. 1 and 2, 21 is a pulse motor;
2 is a shaft rotated by a pulse motor, 23 is this shaft 2
It is a cylindrical body that is iron-fitted to 2.

The cylinder body 23 includes an external gear 24 that meshes with the external gear 20 mentioned earlier, and a pair of collars 25 that sandwich this external gear 24.
, 26 are provided. The collars 25 and 26 act as forks for moving the rotating speed change ring 8 in the axial direction, and the external gear 24 between the collars 25 and 26 moves the speed change ring 8.
It acts as a gear for transmitting the rotation of the cylinder body 23 to the cylinder body 23.
To summarize, the shaft 22 is an element driven from the pulse motor 21 side, whereas the cylinder body 23 is an element driven from the speed change ring 8 side. In order to compare the rotational speed of the shaft 22 driven by the pulse motor 21' and the rotational speed of the cylinder body 23 rotated by the speed change ring 8,
A cam device including a cam groove 27 and a roller 28 coupled thereto is provided between the cam groove 27 and the cylindrical body 23.

In the illustrated case, a cam groove 27 is provided on the cylindrical body 23, and a roller 28 that engages with this cam groove 27 is provided on the shaft 22, but the installation relationship is reversed, and the cam groove 27 is provided on the shaft 22. On the other hand, the roller 28 can also be provided on the cylinder body 23. Further, the cam surface and roller in the cam device may be replaced with a threaded surface that acts equally with them. The pulse motor 21 or an alternative drive source is for inputting a signal, and the rotation of the shaft 22 driven by it is controlled by the speed change ring 8.
compared to the rotation of If there is a difference in rotational speed between the shaft 22 and the cylindrical body 23, the cam device acts to move the speed change ring 8 so as to eliminate this difference, so that the output shaft 4 reaches the rotational speed instructed by the pulse motor 21. It will now rotate at exactly the same rotation speed. Pulse motor output shaft 29
A cam groove 27 is present on the system leading to the output shaft 4 of the transmission section. Therefore, there is room for a phase difference to occur between the output shaft 29 of the pulse motor and the output shaft of the transmission section, but the phase difference is limited to the amount allowed by the cam device. Even if it were possible, it would be a negligible amount. The present invention focuses first on the following points regarding the speed change ring 8.

1 This is a member that extracts output, and rotates at a rotation speed equal to the rotation speed of the output shaft.

2 This is the largest diameter member within the casing.

3 This is a member whose inner peripheral surface is utilized.

4 This is a member that is moved in the axial direction of the input shaft and output shaft.

The present invention focuses on the above points, and makes it possible to extract the rotation of the speed change ring 8 by providing an external gear 20 on this member or a member that moves in the axial direction together with the gear ring 8, and at the rotation extraction site, the command rotation and the transmission. This system comprises a device for comparing the rotation of the speed change mechanism and a device for moving the speed change ring 8 in accordance with the comparison result, thereby integrating all of the parts for automatic control in the vicinity of the speed change mechanism.

The automatic control part shown in Fig. 2 can be housed in a single auxiliary casing with an open bottom.The auxiliary casing is attached to the main casing that houses the transmission mechanism, and the gears 20 and 24 are meshed during installation. It's okay.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of a continuously variable friction transmission according to the present invention, FIG. 2 is an enlarged view of the main parts of FIG. 1, and FIG.
FIG. 3 is a developed view of a cam groove on a cylinder body that is rotated in conjunction with a speed change ring in the one shown in the figure. 1... Electric motor, 2... Output shaft of the electric motor, 3... Input shaft of the continuously variable transmission mechanism section, 4... Output shaft of the continuously variable transmission mechanism section,
5... Transmission wheel, 6... Conical trochanter, 7... Raceway ring, 8... Speed change ring, 9... Cylindrical part, 10...
・Ball spline, 11... Shoki force generator, 12
... Thrust bearing, 20... External gear, 21... Pulse motor, 22... Shaft rotated by ~gus motor, 23
. . . Cylindrical body integrated with shaft 22, 24 . . . External gears that mesh with two external gears, 25, 26 . . . Collars, 27 . . . Cam grooves, 28 . Colorful drawings of hair illustrations 2

Claims (1)

[Claims] 1 On the transmission system from the input shaft 3 to the output shaft 4, there are a plurality of conical rotors 6 that perform planetary motion, and one speed change ring 8 that is commonly frictionally engaged with the conical surface of the conical rotor 6. is provided, the speed is changed by moving the speed change ring 8 in the direction of the center line, and the rotation of the speed change ring 8 is transmitted to the output shaft 4. A first element 23 rotated via an external gear 20 on a member that has been rotated and a second element 22 rotated by a drive source such as a pulse motor 21 are rotatably and slidably fitted, A cam device is interposed between the first and second elements 23 and 22 to move the first element 23 in the axial direction until there is no speed difference between the first and second elements 23 and 22. , friction continuously variable transmission.