SU44797A1 - Variable gear mechanism - Google Patents

Description

The invention relates to mechanisms for transmitting rotation, comprising drive and driven shafts located on the same geometrical axis, as well as a parallel or auxiliary roller coupled to them by means of adjustable gears along their axis. The task of the designer of such gears is to obtain the highest ratio of the number of their steps to the number of wheels. This ratio is usually less than one. In the proposed transmission mechanism, the ratio of the number of stages to the number of wheels is extremely high, since in this program the number of stages is equal to the number of wheels, and the ratio of these numbers is one. Such a high ratio is achieved by using three pairs of adjustable gears, of which each pair is located on a separate hub, freely rotating around the common geometrical axis of the drive and driven shafts, one sleeve can be coupled with the drive shaft, second with the drive and driven and third with driven shaft.

In FIG. 1 shows a diagram of the transmission mechanism; FIG. 2-section of the transmission mechanism; FIG. 3 is a section of the transmission mechanism along the line AB of FIG. 2; FIG. 4-turn drum surface for controlling levers for shifting gears.

On the drive shaft a and on the driven shaft g, located on the same geometrical axis with the shaft a, sleeves b, e, e are freely mounted with blocks of gear wheels that slide along their slits: -z, ik and lm, coupled respectively, with gears n-o, pr-and-t, rigidly mounted on the auxiliary roller b. Couplings y and f are mounted on the slits of the driving and driven shafts along their axis. get 12 combinations of gear positions and clutches, and with it 12 gears.

In order to control all the levers intended for the relocation of gears and clutches, a drum is applied to the I-V grooves, which rearrange the levers and provide for all 12 gear changes in one turn of the drum.

To rotate the drum, there is a worm wheel and a worm wheel connected to the drum, h, and in one turn the drum turns on VJ2

its circumference. On the axis of the drum from the outside of the box, in which the transmission mechanism is enclosed, a dial w is mounted, which provides easy orientation when choosing the required transmission level.

Subject invention

The variable gear mechanism, consists of an additional roller parallel to the coaxial drive and driven shafts and interfaced with these shafts by means of adjustable gear wheels along its axis, characterized in that the adjustable gear wheels are arranged in two on each separate bushings, of which can be coupled with the drive shaft, the second with the drive and driven and the third with the driven shaft.

fig1

h