RU1778400C - Drive with flexible tractive member - Google Patents

Description

1

(21) 4902202/28 (22) 12/04/90 (46) 11/30/92. Bull. N544 (75) VA

(56) Copyright certificate of the USSR No. 55036. class F 16 H 9/16. 1938.

(54) TRANSMISSION WITH FLEXIBLE TRACKS

(57) Usage: mechanical drives with variable gear ratio. The transmission comprises a driving and driven transmission elements, a tension roller and a flexible pull member connecting them. Each transmitting element consists of two axially movable conical disks with two grooves on the conical surface and two grooves mounted in the grooves with the possibility of moving carriages with teeth along them. As a flexible pull member, a sleeve-roller chain is used having rollers with a conical surface at the ends to interact with the disks. 2 ill.

FIELD OF THE INVENTION This invention relates to transmissions with a flexible pulling element and can be used in mechanical transmissions with a variable gear ratio.

A known device with flexible traction has a low load capacity.

The aim of the proposed transmission is to increase its load capacity.

In the proposed transmission, the sleeve-roller chain serves as a flexible pulling organ.

1 shows a transmission device; figure 2 - transmitting element.

The transmission consists of two identical elements (figure 1) - the leading 1 and the driven 2, the tension roller 3 and the sleeve-roller chain 4, placed in the housing 5 with a cover 6. Each transmission element (figure 2) is made of two conical disks with direct generatrices of the cones, of which the disk 7 is mounted on the splines of the shaft 9 by a screw 10, the disk 8 can be moved along the splines of the shaft with an adjusting nut 11. From the axial movement in the bushings 12 of the housing 5, the transmitting element is held by a split ring 13.

In the grooves 14 of the disks 7 and 8 there are two carriages 15 carrying the tooth 16. The working profile of the tooth is described by an arc from the center located on the pitch circle of the disks at a distance of half the chain pitch from the axis of symmetry of the tooth, with a radius smaller than the chain pitch by the size of the roller radius chains.

The slide 17 of the carriage 15 is in cross section in the shape of a dovetail, which holds the carriage in the groove when one of the teeth does not mesh with the chain 4 enclosing the transmitting element. The transmission elements 1 and 2 are located in the housing 5 by the ends 18 of the shafts 9 in opposite directions. Chain 4 differs from the standard sleeve-roller chain in that the ends of its rollers are made with conical heads 19c with the same cone angle as the discs 7 and 8.

Xi

fifteen

In order for the chain to be constantly engaged with the teeth 16, the angle of its coverage should be no less than 180 °, which is provided by the roller 3, the position of the axis 20 of which is regulated by the nut 21. The disks 7 of the transmission elements 1 and 2 are kept from rotation by the clamps during adjustment 22,

The operation and adjustment of the transmission is as follows.

The torque applied to the end 18 of the input shaft of the drive transmission element 1 is transmitted by teeth 16 to the drive branch of chain A (Fig. 1, lower) and the teeth of the driven drive element 2 to its output end of the shaft.

In order to change the gear ratio in a stopped and unloaded gear, the transmission element i is fixed so that one tooth is engaged with the chain. The nut 11 is turned off the shaft, reducing the long circumference of the transmitting element by exactly two steps, while the chain sags. The adjusting nut 11 of the driven transmission element 2 is screwed onto the shaft in the same way, while its pitch circle increases by two steps, and the chain is tensioned.

Since the generators of the cones of the transmitting elements are rectilinear, an excessive or weak chain tension is possible, which

Ј2.

this is eliminated by moving the tension roller by nut 21. When the chain in the side dishes and the tapered ends of its rollers wear, both nuts 11 of the transmission elements do not turn on the shafts, thereby shifting the tooth of the transmission elements and covering the chain to a pitch circle corresponding to the increasing chain pitch.

Claims (1)

SUMMARY OF THE INVENTION A gear with a flexible pulling body, comprising a driving and driven transmission elements consisting of two axially movable conical disks each having on the conical surface two diametrically opposite radial grooves located opposite the grooves of the corresponding conical disk and two carriages, installed in the grooves with the possibility of moving along them, covering the transmitting elements of a flexible pulling element, and at least one tension roller for interacting with the latter, In this case, in order to increase the load capacity, the flexible pulling organ is made in the form of a roller-roller chain having rollers with a conical surface at the ends for interacting with the conical disks, and at least one tooth is made on each carriage for interacting with chain. Riga. No.