Adjustable hydraulic gear shaft transmission mechanism

Abstract

The invention discloses an adjustable hydraulic gear shaft transmission mechanism. A free end gear of a crankshaft is in transmission connection with a high-pressure oil pump shaft gear at the end part of a high-pressure oil pump shaft by an adjusting mechanism; a flywheel end gear is in transmission connection with a camshaft gear at the end part of a camshaft by an adjusting mechanism; the adjusting mechanism comprises an outer shaft, a mandrel, an adjusting structure with a T-shaped structure, an oil transmission valve and a cover plate; the adjusting shaft is sleeved on the mandrel; the outer shaft is assembled out of the adjusting shaft; a left oil cavity is formed between the left end of the adjusting shaft and the cover plate; a right oil cavity is formed between the adjusting shaft and the outer shaft; the oil transmission cavity is assembled out of the outer shaft; a left injection hole on the oil transmission valve communicates with the left oil cavity; a right injection hole on the oil transmission valve communicates with the right oil cavity; the adjusting shaft and the outer shaft are engaged by a spiral tooth groove; and the adjusting shaft and the mandrel are matched by a spline tooth groove. The adjustable hydraulic gear shaft transmission mechanism has the advantages of: reasonable structure, capability of increasing the adjusting torque, improving the adjusting precision and reducing the adjusting pressure, and change of the intake / exhaust valve timing and the oil injection timing.

Description

technical field [0001] The invention relates to the technical field of hydraulic transmission, in particular to an adjustable hydraulic gear shaft transmission mechanism, in particular to a gear shaft transmission mechanism for realizing variable fuel injection timing and variable valve timing of an engine. Background technique [0002] With the rapid development of internal combustion engine technology in the country, in the field of internal combustion engines for vehicles, in order to improve the fuel consumption and exhaust emissions of internal combustion engines, many technologies that adjust variable valve timing through hydraulic pressure have emerged. However, since this type of technology is mainly aimed at the field of internal combustion engines for vehicles, these technologies cannot be applied to the field of high-power marine medium-speed diesel engines at present. The main reasons mainly include: [0003] 1. The hydraulic adjustment mechanism is based on the...

AI Technical Summary

Problems solved by technology

[0003] 1. The hydraulic adjustment mechanism is based on the design principle, and the adjustment torque is too small due to insufficient strength;

[0004] 2. The hydraulic adjustment stroke is small, resulting in low adjustment accuracy and poor self-stabilization ability;

[0005] 3. High hydraulic adjustment pressure, resulting in increased sealing difficulty

[0006] In addition to the above reasons, part of the hydraulic adjustment scheme is installed on the camshaft, resulting in the disturbance of the transmission mechanism directly affecting the operation of the camshaft during the adjustment process.

Images