Engine transmission device with variable compression ratio and engine

Abstract

The invention discloses an engine transmission device with a variable compression ratio and an engine. The transmission device comprises a combustion air cylinder, a combustion piston cooperating in the combustion air cylinder, a control air cylinder, a control piston cooperating in the control air cylinder, a crankshaft, an upper connecting rod, a middle connecting rod, a lower connecting rod and a control rod. The lower end of the lower connecting rod is hinged to the crankshaft, the upper end of the lower connecting rod is hinged to the middle of the middle connecting rod, one end of the middle connecting rod is hinged to the lower end of the upper connecting rod, the other end of the middle connecting rod is hinged to the lower end of the control rod, the upper end of the upper connecting rod is hinged to the combustion piston, the upper end of the control rod is connected with the control piston, and the control piston can move and be locked. The compression ratio of the engine can be changed and locked, and the material strength requirement and the driving force needing to be provided are reduced.

Description

technical field [0001] The invention belongs to the field of engines, and in particular relates to an engine transmission device and an engine with variable compression ratio. Background technique [0002] Chinese patent applications CN107438706A and CN107110015A both disclose transmissions for engines with variable compression ratios, in operation the translational movement of the combustion piston and of the transmission member integrated therewith is initiated and maintained by the combustion of the mixture in the combustion cylinder, this movement is determined by Guided by the existing connection between the combustion piston and the combustion cylinder and the connection device, this movement is transmitted to the assembly formed by the gear and the connecting rod to rotate the crankshaft, the control device adjusts the position of the control member in the main direction, the position of the control member The movement is guided in the main direction by the second con...

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Problems solved by technology

The above-mentioned prior art is equipped with a control cylinder and a combustion cylinder, and adopts rack and pinion to realize the transmission. There are 4 gear pairs in total, which require high manufacturing and assembly precision, large loads on the teeth, and high requirements for material strength. Moreover, the transmission The mechanism is complicated, and a horizontal pressing device is required in the horizontal direction to ensure that the variable compression ratio main device does not spread out during work.

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