SU71080A1 - Gearbox with variable gear ratio - Google Patents

Description

Gearbox with variable gearbox

Filed on July 19, 1947 to the USSR Ministry of Machine-Tool Engineering for jYs 534 (357И9)

Posted on August 31, 1948.

Gearbox designs with variable gear ratios that enclose a cam washer sitting on a drive shaft, interacting with two levers that transmit a swinging motion to a ratchet device located on the driven shaft, are known.

In contrast to the known structures, in the proposed gearbox, the driving and driven shafts are located coaxially, and both levers are located in the same plane with the cam washer and are interconnected by means of a spring.

Each of the levers transmitting the swinging motion is composed of two parallel parts seated on a common trunnion, with one part carrying a ratchet pawl connected to the second part interacting with the cam washer with the possibility of mutual angular shift. This makes it possible to change the gear ratio of the gearbox.

The drawing shows a General view of the proposed gearbox.

When the drive shaft 1 rotates, the cam washer 2 mounted on it drives an oscillating movement of two parts 3, 3 levers 3, 6 turning on axles 4. Both parts 3, 3 of the levers are located in the same plane with the cam washer 2 and by means of springs 5 zana between themselves.

The oscillatory movement of the parts 3, 3 of the levers is transmitted in parallel to the located parts 6, 6. The parts 6, 6 are connected with the parts 3, 3. of the levers by the protrusions 7 entering into the corresponding slots of the parts 3. The projections 7 are clamped by mounting bolts S with the possibility of angular the displacement of parts 3 and 6 relative to each other.

The ratchet pawls 9, mounted on the parts 6, during oscillatory motion of the latter, cause the rotation of the ratchet wheel JO, which sits on the key on the vedolum shaft 77, which is located coaxially with the drive shaft 7.

By installing parts 3 and 6 with an angular offset relative to each other, it is possible to change the gear ratio from the drive shaft to the driven shaft.

Subject invention

Claims (2)

1. A gearbox with a changeable gear ratio, comprising 393 a cam washer sitting on the drive shaft, interacting with two levers, transmitting a swinging motion to a ratchet device located on the driven shaft, characterized in that the drive and driven shafts are located coaxially, and both levers are located in one plane with the cam washer and interconnected by means of a spring. 2. The gearbox according to claim 1, characterized in that for possibility of change. the gear ratio each of the levers is made up of two parallel parts sitting on a common trunnion, with one part carrying a ratchet dog connected to the second part interacting with the cam washer with the possibility of mutual angular shift.