SU987142A1 - I.c.engine piston - Google Patents

Description

(54) PISTON FOR ENGINE INTERNAL

one

The invention relates to mechanical engineering, in particular to engine building, more specifically to pistons of an internal combustion engine.

A well-known piston for an internal combustion engine, comprising a housing provided with grooves with compression and oil wiper rings installed in them, with drainage holes in the oil-groove made to the inner surface of the piston 1.

However, during the engine start-up, the cylinder connected to it is insufficiently compacted due to leakage of the working fluid through the drain holes.

The aim of the invention is to improve the reliability of the piston.

The goal is achieved by the fact that on the inner surface of the piston in the zone of the drainage holes there is an annular groove and in the latter a spring-loaded split ring is installed with the possibility of movement along the axis of the piston, blocking the drainage holes. Combustion

FIG. 1 shows the proposed piston longitudinal section; in fig. 2 shows section A-A in FIG. one.

The piston contains the bottom I, the head 2, the skirt 3, the piston grooves 4 and 5 with a correspondingly compression 6 and oil scraper 7 rings, sealing the cylinder 8 associated with the piston. In the groove 5 there are drainage holes 9 for draining oil from it to the inner surface

, Q piston, on which in the area of the drainage holes 9 there is a ring groove 10. In the annular groove 10 there is a split ring 12 spring-loaded with springs 11.

When the engine is started, the piston is completely reciprocating at an average speed determined by the starting frequency of the engine shaft rinsing. The split spring-loaded ring 12 in this case is held in place by the frictional forces between it and the piston.

Claims (1)

20 The lubricant removed from the cylinder walls accumulates in the drainage orifices 9, which have sufficient volume for this purpose due to the short duration of engine start. After starting the engine, the crankshaft revolutions increase, and with them the inertial forces acting on the ring 12. This leads to the fact that ring 12, overcoming the frictional forces between it and the hole and the compression force of the spring 11 begins to oscillate around the drainage holes 9, namely, upward, in the direction of the bottom 1 under the action of inertial forces about half the stroke of the piston from the top dead center to the bottom dead center, and down in the direction from the bottom. upon further movement of the surface to the lower dead point, i.e., in accordance with the law of change of acceleration, At. moving the ring 12 relative to the drainage orifices 9, the latter open and communicate the subshift cavity with the groove 5 under the oil wiper ring 7, which ensures the removal of lubricating oil from the cylinder walls into the subshift cavity. The ring 12 has the highest speed of movement when it overlaps the drainage holes 9, i.e. in the middle position relative to the additional groove 10, which provides an almost constant communication of the piston cavity with the groove 5 iodine oil scraper ring 7 when the engine is running. Sealing the drainage orifices 9 during engine start with a ring 12, which is pressed against the force by elastic forces, allows the pressure seal to be sealed due to the oil scrub ring 7. Claims for the internal combustion engine, comprising a housing fitted with cannons with compression and oil scoopers installed in them rings, moreover, drainage holes are made in the groove of the oil scraper ring with outlet to the inner surface of the core, characterized in that, in order to increase reliability, the inner Over ited drainage hole in the piston zone and an annular groove in the latter is mounted for movement along the piston axis of the split ring spring-loaded, overlapping drainage holes. Sources of information taken into account in the examination of 1 USSR Author's Certificate No. 565109, cl. F 02 F 3/00, 1975. L. L J & ig. 3