RU1837131C - Friction variable speed drive - Google Patents

Description

The invention relates to mechanical engineering, in particular to transmissions with an continuously variable gear ratio, and can be used in machine drives and automotive machinery,

The purpose of the invention is to increase the reliability of the variator at different revolutions of the drive motor and to expand the range of the gear ratio.

In FIG. 1 shows a friction CVT in section; in FIG. 2 - one of the disks with p) eami; in FIG. 3 - cranks with plates and friction discs on the driven shaft.

I The variator contains a first stage 1, a second stage 2. a drive shaft 3 and a driven 4. Each stage contains three U-shaped cranks 5 on which friction plates are fixed 6. The cranks 5 are connected to the groove disk by means of rotational-translational pairs 7. The grooved disc unit 7 can be displaced in the transverse direction by a lead screw (not shown in the sketch) to change the gear ratio. On the cranks 5 there are spherical bearings 8, which interact with the inclined pressure rings 9. equipped with movable support joints 10. To change the inclination of the rings 9 (in the process of changing the gear ratio), the variator is equipped with power levers 11, On the case 1 and 2 of the variator stage diametrically opposite installed blocks of compression springs 12, which

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they press the rings 9 against the spherical bearings 8 and the force extends to the compression of the friction plates 6 with the disks 13. which fall into the working area. The cross sections of the plates and discs in Fig. 1 are shown conditionally and in accordance with the rules of the graphic.

Friction variator works as follows.

When the drive shaft 3 rotates, the cranks 5 of the first section transfer the load in turn, depending on the pressing of the next plates b to the disks 13 using an inclined pressure ring E. Next, the moment is transmitted by the cranks to the block of the groove disks 7. The moment is transferred to the second degree in a similar way, but in the reverse order, when the grooved disk unit 7 is mixed to its lowest position, the gear ratio of the variator is 3.85. At this moment, the ring 9 of the second stage has the largest angle of deviation from the plane perpendicular to the axis of the shaft 4.

With the opposite displacement of the block of the grooving disks 7 (up), the gear ratio of the variator is 1 / 3.85. Ring 9 is now the first stage has the greatest marked deviation. The overall gear ratio range of the described variator is 14.8. When the grooved disc unit 7 is aligned with the axis of the shafts 3 and 4, the variator operates in direct transmission mode. Thanks to the two main bearings in each crank, they are well stabilized against inertial vibrations around an axis perpendicular to the axis of the variator shafts. The wear of the peripheral guides of the crank is excluded, as is possible in the prototype. This improves reliability. Changing the angle of inclination of the pressure rings 9 makes it possible to keep the angle between the pressure plane of the ring and the axis of the spherical bearings 8 constant and optimal (about 1 °) regardless of the distance between adjacent cranks at the moment of blocking the transmitting force.

Claims (1)

CVT works in oil. SUMMARY OF THE INVENTION A friction variator comprising a housing, drive and driven shafts, a rocker a transforming mechanism, the link of which is made in the form of a disk with grooves, cranks, on which the rocker stones are pivotally mounted interacting with the corresponding grooves, a transmission device consisting of friction plates and interacting with them spherical bearings mounted on cranks, friction disks, periodically interacting with friction plates, and a pressure ring, periodically interacting with spherical thrust bearings, characterized in that. that, in order to increase the reliability of the variator at different revolutions of the drive motor and to expand the gear ratio range, the variator is equipped with additional rocker converting mechanism, cranks and motion transmission devices, similar to the main, two blocks of pressure elastic elements, each interacting with the corresponding pressure ring and installed diametrically opposite, and with two movable support joints, the cranks are made U-shaped with two main bearings each and pivotally mounted main - on the drive shaft, and additional - on the follower, discs the rocker mechanisms are rigidly interconnected and mounted with the possibility of lateral displacement, the grooves of the disks are located opposite each other, the main friction disks are mounted on the drive shaft, and the additional ones on the follower, and the pressure rings are mounted on movable support hinges and kinematically connected to the rocker disks mechanisms through power levers. go with i oo so -J . with ff b § FIG. 3