SU889928A1 - Apparatus for unloading piston - Google Patents

Description

(54) DEVICE TO UNLOAD PISTON

one

The invention relates to mechanical engineering and can be used in crank mechanism used in volumetric displacement devices, for example in piston machines.

It is known a device for unloading a piston from a normal component, it, the resultant, it has piston forces, an axis for swiveling the piston rod with a connecting rod, two pairs of rolling elements, two parallel and opposite springs, pressing the rolling bodies to the guides. . The pairs of rolling bodies are mounted on carriages connected to the axis for the hinged connection of the piston rod with the connecting rod, the guides are made on the beam, which is rigidly fixed on the bed of the piston machine 1.

Since the beam is fixed on the frame, and the carriage must be able to move along the beam, the latter must have, at best, two supports located on either side of the carriage. Such a fastening of the beam is a disadvantage of the known device, since in order to prevent the beam from bending away from the normal component of the resulting shear force, this beam must be made of significant cross sections, the larger the longer the beam and the larger the normal component. For this reason, the overall dimensions of the device increase. In addition, the overall dimensions of the device are increased due to the fact that the rollers are located on different axes, which are spaced apart from each other, and encompass the beam from the outside along the guides.

ten

The purpose of the invention is to reduce the overall dimensions of the device for unloading the piston.

The goal is achieved by the fact that each pair of rolling bodies is placed on axis 5 on one side of the sides of the hinged connection of the piston rod and connecting rod, and all the rolling elements are mounted on the axis using eccentric bushings, while the guides are parallel to the axis on both sides of her and in every pair of bodies

The 20 rollers are pressed against guides located on opposite sides of the axis, and the eccentric bushings in each pair of bodies

The rollers are rotatably mounted relative to each other by means of the said springs.

FIG. 1 shows the proposed piston unloading device; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 shows a section B-B in FIG. 2

The device includes an axis 1, the shaft is an axis of the articulation of the rod 2 of the piston 3 with the connecting rod 4. On this axis, eccentric bushings 5 are installed symmetrically with the articulated joint, on which the rolling bodies are installed, made in the form of rollers 6 and 7 with bearings 8 Each roller with a bearing is mounted on its hub. Swing bodies form two pairs. In each pair, the bearings are pressed against one of the guides 9 or 10, which are parallel to each other. The clamping is carried out due to the fact that the cylindrical surface of each eccentric bushing on which the roller bearing is mounted is eccentric relative to the axis of the bearing of the articulated joint of the piston rod. The two eccentric sleeves, on which the rollers of different pairs are located, under the action of the spring 11 tend to rotate one relative to the other around the axis 1, thereby allowing the rollers to move in a direction perpendicular to the direction of the axis to the respective guides.

During the reciprocating movement of the piston 3 in the cylinder 12 of the piston machine, the axis 1 coupled with the rod 2 moves together with the pairs of rolling bodies. In this case, the rollers 6 roll, rotating along the guides 10, and the rollers 7 roll, rotating in the direction opposite to the rotation of the rollers 6, along the guide surfaces 9. Depending on the direction of the resultant piston force and the direction of displacement of the axis of the connecting rod relative to the axis of the cylinder, the normal component of the resultant

piston forces perceive either rollers 6 or rollers 7.

Reducing the overall dimensions of the proposed device allows its use in compact compressors,

in which the piston group and crank mechanism work without lubrication.

Claims (1)

1. Patent of Germany No. 904612, cl. 47 in 15/00, 1954 (prototype). one.  Y7 five, // Ayy Y ///// 7 / Fit.5