SU619701A1 - Device for changing radius of rotating crank - Google Patents

Description

Izbretspie refers to c) b, 1 part of mechanical engineering, namely, devices for converting rotational motion in the return-post posture.

A crank with a variable radius is known by mounting a rotatable disk on the shaft with an eccentrically placed crankshaft finger 1.

The disadvantage of a crankshaft is the inability to adjust its radius during operation.

A device for changing the length of rotating cranks under load is known, comprising a crank shaft with external and internal eccentrics forming a crank, having relative adjustment between them, and helical gears, one of which is fixed, and the rest, having freedom of rotation, are associated with external eccentrics, and an additional shaft with helical gears engaging with the crank gear gears, having axial movement by means of a screw bunk 2.

Such a device has insufficient operational reliability due to the complexity of the design.

The aim of the invention is to improve the operational reliability of the device by means of simplifying its design.

The goal is achieved by the fact that, in the proposed device, two coupling halves are installed on the shaft, which are in contact with the inclined faces of the working cams, one of the coupling halves is connected to the external eccentric via an auxiliary disk ythy, and the other on the shaft and mounted relative to the latter with the possibility of translational movement from the screw pusher.

FIG. 1 shows a device; in fig. 2 - handle for adjustment.

The device for changing the length of the crankshaft contains a shaft 1 with an internal eccentric 2, an external eccentric 3, a connecting rod 4 attached to an actuator (not shown). An external eccentric device with a disk coupling 1, 5, 5 is connected with a coupling half 6 which is freely rotating onto n ... iy, and I have working cams 7 with oblique faces, articulated with cams of coupling 8, which has axial rendition novac 1, provided by LHHOIIOM or spline connection 9. With luwiyufuta 8 contacts the screw-pusher 10, having a handle 11 of the adjustment.

When the handle 11 is rotated, the screw 10, moving along the thread, moves the coupling half 8 along the shaft I. Lastly, interacting with the coupling half 6 through the cams 7 with oblique working faces, rotates the coupling half 6 on the shaft 1.

At the same time, the eccentric 3 coupled to the half coupling 6 is rotated relative to the eccentric 2, changing the crank size.

When rotating the handle 11 in the opposite direction, the screw 10 moves away from the half-coupling 8, releasing the latter. The coupling half 6 under the influence of external loads on the crankshaft, interacting with the coupling half 8 through the inclined faces of the cams 7, moves the latter after the screw 10 and turns on the shaft 1, simultaneously turning the external eccentric 3 relative to the eccentric 2 and changing the length of the crank. The position of coupling halves 6 and 8, respectively, of eccentrics 2 and 3 is evaluated on a scale of 12.

The proposed design increases the efficiency of the device, reduces the labor intensity and metal consumption of manufacture. The capacity of an operating mechanism driven by a device, such as a dosing pump, varies when it is adjusted from zero to maximum while maintaining a predetermined pressure level of the working medium in the line.

Claims (2)

1. Authors certificate of the USSR L1 228405, cl. F 16 C 3/28, 1966. 2. USSR author's certificate number 242624, cl. F 16 C 3/28, 1967. eleven lil