SU33782A1 - Transmission for speed change - Google Patents

Description

The gears for very | large gear ratios with relatively small transmitted forces, it is known to use as a leading body a disk provided on the surface with a spiral groove, in which the finger of the reciprocally moving rod enters. In the proposed mechanism, the rotation of the driven disc is transmitted from an additional finger fixed on the rod, which enters the radial curved grooves of the disc.

On the drawing flg. 1 shows a side view of the mechanism; FIG. 2 is a section along the line AB in FIG. 1, and FIG. 3 is a view along arrow C in FIG. one.

The transmission mechanism is based on the property of uniform motion along a straight line passing through the pole of the Archimedean spiral, the point of intersection of this line with the spiral, with a uniform rotation of the line around the pole.

On the drive shaft 3, the drive plate 2 is rigidly set with sliced on it. on both sides of the spiral grooves, and on one side cutting of the grooves of the right, and on the other side of the left. On the same shaft, there is a loose drive 1, on which, on both sides, slightly grooved curves, radially arranged, are cut, respectively

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with right and left inclination to the diameter, representing segments of the spirals. A rod 9 is mounted at a right angle to the shaft 3, freely moving in the guide. In the socket of the head of the rod, on rollers b, a triple plug 4 sits freely, covering both teeth 7 and 2 with its teeth. At the ends of the teeth there are two pairs of fingers, of which fingers 12 enter alternately into grooves // of the disk / one with one or the other the sides of the disk, and the fingers 5, respectively, into the grooves of disk 2. The distance between the fingers of each pair is such that, simultaneously, only one finger can enter the grooves of each disk. At the ends, the spiral grooves of the disk 2 have bevels and the depth of the grooves at the ends is gradual. These circular parts of the grooves on both sides of the disk must be made at the same radius and must be located opposite each other.

The mechanism operates as follows. When the drive disk 2 rotates, one of the fingers 5 alternately alternates on one or the other side of it, switching them, i.e., withdrawing one finger from the groove and simultaneously inserting

the other finger into the groove on the opposite side of the disk occurs when the fingers pass along transitional circular arcs at the ends of the spirals. At the same time, at the moments of switching, the plug 4, being protected from untimely movements by the spring (, alternately moves in one or the other direction parallel to the shaft 5 by an amount equal to the depth of the grooves, while moving on its rollers along the slot in the bar 9. Simultaneously with the fingers 5, the fingers 12 are also forcibly moved in the disc grooves I. During the intervals between switching points, the plug 4, guided by the fingers 5 sliding along the grooves of the disk 2, moves together with the rod 9 in the plane of the drawing at a right angle to the shaft, then When you switch them into the grooves of the disk 7 alternately at the ends of the grooves around the circumference of the disk, then at the ends facing the center of it, and, in the intervals between the moments of switching, the slippers they rotate the disk by an angle corresponding to the inclination of the grooves along the grooves.

and then back, reciprocating movement of the plug into the rotational movement of the disk /.

Transmission can only work in the direction of reducing the number of revolutions.

The subject matter of the invention.

Claims (3)

1. Transmission for changing the rotational speed using a disk with a spiral groove on its surface, in which the groove includes a finger of the rod reciprocating when the disk is rotated, characterized in that the rod 9 uses a finger / 2 to rotate the driven disk / equipped with for this purpose radial, slightly curved grooves //. 2. The form of transmission performance under item 1, characterized in that the disks 7 and 2, in order to obtain a continuous rotation of the disk 7 in one direction, are provided with grooves with a reciprocal direction on both sides. 3. The form of the transfer under item 1 and 2, characterized in that the grooves of the disk 2, into which the pins 72 of the rods fit, are provided at the beginning and at the end with bevels for inserting the pins 72 of the rods into the grooves 77 either from one or the other side of the disk 7 . Figz Fig2 h