SU1227867A1 - Friction frontal variable-speed drive - Google Patents

Description

The invention relates to mechanical engineering and can be used for infinitely variable speed adjustment at constant shaft power in machine tools and lifting equipment.

The purpose of the invention is to increase reliability by reducing the loads on the bearings, which is ensured by the implementation of a flexible disk of variable thickness.

The drawing shows a friction frontal variator.

The variator consists of a drive roller 1, an intermediate flexible disk 2 of variable thickness increasing from the periphery to the center, and a driven roller 3. To maintain the contact position of the disk 2 of rollers 1 and 3, the gland rollers 4 and 5 are pressed against the disk 2 by springs 6 and 7. All elements of the variator are located on bearings (not indicated) in the housing 8.

The variator works as follows.

When the driving roller 1 rotates due to the friction forces, the flexible disk 2 drives and carries the driven roller 3. The necessary pressing force is provided by the springs 6 and 7 through the pressing rollers 4 and 5. The rotational speed of the driven roller 3 is adjusted when the intermediate disk axis moves 2 up-down (by hell ,,).

With the arrangement of the axis of the disk 2 shown in the drawing, the rotational speed of the driven roller 3 is minimal.

In the case of moving the axis of the disk 2 upwards (by the drawing), the frequency of rotation of the driven roller 3 smoothly increases to the maximum value. Subject to the transfer of the variator constant ed. A. Dolinich Order 2277/38

Compiled by E. Baranovsky

Tehred I. Veres Proof-reader I. Muska

Circulation 880 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

278672

The power transmitted from the disk 2 to the roller 3 decreases in torque with increasing rotational speed. Since the magnitude of the torque is proportional to the pressing force that is generated by the spring 6 through the roller 4, as the rotational speed increases, it is advisable to reduce the pressing force. In the event that the disk 2 is yen thickening from the periphery to the center and the law of thickness variation is consistent with the characteristic of the spring 6, the pressing force (and accordingly the transmitted torque) can

15 is inversely proportional to the frequency of rotation of the roller 3.

Since the frequency of rotation of the roller 1 is constant, with a constant transmitted power, the torque transmitted from roller 1 to disk 2 is also constant. Since the magnitude of the rotating moment is proportional to the force

press, the latter is advisable to maintain constant. Consequently, the spring 7 must be sufficiently flat and ensure a constant pressing force, regardless of the thickness of the disk 2.

The load on the variator bearings does not depend on the size of the disk 2 and, therefore, allows to increase the range of adjustment. The disk 2 is made flat and thin, which is sharp

reduces the moment of inertia of the variator. Since the pressing force is closed in a short power circuit, the body of the variator can be made non-rigid. All this allows to reduce weight

variator. When the variator operates, the flexible disk is deformed at each moment, tracing the shape of the rollers and 1 and 3, which reduces the load on the bearings of the latter.

Claims (1)

FRICTIONAL FRONT VARIA- A TOP containing a housing, drive and driven rollers mounted on bearings, an intermediate flexible disk and compression rollers, characterized in that, in order to increase reliability by reducing bearing loads, the flexible disk is made of variable thickness, increasing from the periphery to the center . -1-227867 A1