SU885581A1 - Piston for automatic changing of i.c. engine compression degree - Google Patents

Description

(54) PROMINARY FOR AUTOMATIC CHANGE OF DEGREE WITH} CATIA OF INTERNAL MOTOR

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The invention relates to engine construction and can be used in internal combustion piston engines.

Pistons are known for automatically varying the compression ratio of internal combustion engines, comprising a housing and a piston pin, connected with bolts, a piston head in the form of a moving cup, forming interchangeable volume chambers with the housing, and check and reduction valves associated with the Variable Chambers volume using channels, and the check valve is placed in the cavity of the piston pin 1 ..

The disadvantage of this piston is that with such a design, it is difficult to access the pressure reducing valve during adjustments during servicing, so COMBUSTION

as this requires disassembly of the piston.

The aim of the invention is ease of maintenance.

To achieve this goal, the reduction valve is also placed in the cavity of the finger, and the channel connecting the valves to variable volume chambers is made in one of the bolts.

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The drawing shows the proposed piston, a General view.

Chambers 1 and 2 of variable volume are formed by the housing 3 and the movable cup 4 and communicate with each other

15 by channel 5, in which a calibrated orifice 6 is made, housing 3 is connected by bolts 7 and 8 to a piston pin 9, having drilling 10 for supplying oil from the oil supply of the 20th main line 11 to the cavity 12 of the piston 9; valve 14 with npyxHHOii 1 5.

The cavity 12 is in communication with the camera 1 1 anal 16, made in the body of the bolt 8, and with the crankcase channel 17.

The piston works as follows. When the engine is running at low loads, the period of the final phase of the injection stroke and at the beginning of the intake stroke is influenced by the gas pressure forces in the engine cylinder, the oil pressure in cavities 1 and 2 and the inertia force of the movable cup 4 is vertically upwards the movable cup relative to the housing 3 is moving in the same direction. In this case, the volume of chamber 1 increases and the volume of chamber 2 decreases. The increasing volume of chamber 1 is filled with oil flowing from chamber 2 through channel 5 with a calibrated orifice 6, and oil coming from supply line 11 through drilling 10 in pin 9, non-return valve 13, cavity 12 and channel 16. When moving a glass 4 upward, the engine compression chamber volume decreases, the compression ratio increases. As the engine load increases, the value of the maximum combustion pressure in the engine cylinder increases, when it rises - the oil pressure in chamber 1 and when the critical pressure is reached, to which the spring 15 of the pressure reducing valve 14 is adjusted, the latter opens.

SLI5 oil from chamber 1 through channel 16, cavity 12 and channel 17 into the engine crankcase occurs.

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The volume of chamber 1 is reduced, and the volume of chamber 2 is increased. At the same time, part of the oil from chamber 1 flows into chamber 2 through channel 5 with a calibrated .5 hole 6. Glass 4 moves downwards relative to housing 3, the volume of the engine compression chamber increases, and the degree of compression decreases. Limits of Mac Max Adjustment. The minimum and minimum compression ratio is limited by the amount of movement of the cup 4 relative to the housing 3.

Claims (1)

1. Patent of England No. 762110, cl. 7 (2) B, pub. 1953.