Return flow scavenging type hydraulic free piston diesel engine

Abstract

The invention discloses a return flow scavenging type hydraulic free piston diesel engine, which comprises a single-cylinder two-stroke diesel engine without a crankshaft connecting rod and a valve distribution mechanism, and a hydraulic system provided with a linear hydraulic pump and a hydraulic motor, wherein a piston in the single-cylinder two-stroke diesel engine is connected with a plunger in the hydraulic system, and a space in the linear hydraulic pump in the hydraulic system is divided into a high-pressure cavity and a low-pressure cavity; the piston in the single-cylinder two-stroke diesel engine can drive the linear hydraulic pump to output high-pressure oil in an expansion travel, and the high-pressure oil is output to the hydraulic motor from a pipe joint C; the piston is pushed back to an upper dead center from a lower dead center by the low-pressure oil end, so that a compression travel of the piston is completed. According to the invention, a crankshaft in the conventional internal combustion engine is omitted, and a middle conversion step of power output is reduced, so that the heat efficiency is about 5% higher than that of the conventional internal combustion engine, the diesel engine can be operated at a variable compression ratio, the best heat efficiency of a full operation work condition is ensured, and the fuel economy is improved.

Description

technical field [0001] The invention belongs to a novel power device, and in particular relates to a return-scavenging hydraulic free-piston diesel engine applicable to internal combustion engine application fields such as vehicle power and engineering machinery power. Background technique [0002] The power device widely used in automobiles is a traditional reciprocating piston internal combustion engine. The heat energy generated by the fuel outputs torque through the piston, connecting rod and crankshaft mechanism, and the torque is then transmitted to the engine through the clutch, gearbox, drive shaft and reducer. wheel. This power transmission method has its inherent problems: the first is that there are many intermediate transmission links, the mechanism is complicated, and the mechanical efficiency is low. The second is that the arrangement of the transmission shaft and the gearbox limits the vehicle's passability and steering flexibility. [0003] The free piston ...

AI Technical Summary

Problems solved by technology

This power transmission method has its inherent problems: first, there are many intermediate transmission links, the mechanism is complicated, and the mechanical efficiency is low.

The second is that the arrangement of the drive shaft and the gearbox limits the vehicle's passability and steering flexibility

[0005] (2) The Chinese patent with the publication number CN102374021A: Free Piston Engine, discloses a complete machine with a double-piston double-combustion chamber structure, each combustion chamber is equipped with intake and exhaust valves, and the drive of the auxiliary mechanism is relatively complicated

This patent cannot prevent the rotation of the piston when it is working, nor does it provide a measurement method for the displacement of the piston, nor can it achieve a variable compression ratio

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