A hydraulically driven variable valve mechanism

Abstract

The invention discloses a variable valve mechanism driven by hydraulic pressure, and its technical solution is to include a control circuit, the control circuit includes a hydraulic cylinder for pushing a connecting rod, a swing hydraulic cylinder for rotating a camshaft, an oil pump, an oil tank, The first reversing valve, the second reversing valve, connecting pipes and several oil pipes, the connecting rod can slide relative to the end face of the hydraulic cylinder, and the hydraulic cylinder and the swing hydraulic cylinder are respectively connected to the first reversing valve and the second reversing valve through the oil pipes. Directional valve, the first reversing valve and the second reversing valve are connected to the oil tank and the connecting pipe through the oil pipe, the connecting pipe is connected to the output end of the oil pump through the oil pipe, and the input end of the oil pump is connected to the oil tank, which solves the problem of transmission efficiency under the drive of the motor It is not high and the motor shaft will not stop in time due to inertia, which will cause errors.

Description

technical field [0001] The invention relates to the field of engines, and more specifically relates to a hydraulically driven variable valve mechanism. Background technique [0002] The gas distribution mechanism is one of the important components of the internal combustion engine, and it is the basis for realizing the engine ventilation process and ensuring that the working cycle of the internal combustion engine's heat-power conversion can be repeated continuously. And existing all kinds of variable valve mechanism, have a kind of all hinged main rocker arm and from rocker arm on the fixed bar, on a camshaft, set common cam and high-angle cam simultaneously, one end of main rocker arm and One end of the slave rocker arm is in conflict with the ordinary cam and the high-angle cam respectively, and the other end of the slave rocker arm is connected with a valve shaft that drives the valve movement. It is controlled by a connecting rod whether the master rocker arm and the sl...

AI Technical Summary

Problems solved by technology

And existing all kinds of variable valve mechanism, have a class that main rocker arm and slave rocker arm are all hinged on the fixed rod, on a camshaft, set common cam and high-angle cam simultaneously, one end of main rocker arm and One end of the slave rocker arm is in conflict with the ordinary cam and the high-angle cam respectively, and the other end of the slave rocker arm is connected with a valve shaft that drives the valve movement. It is controlled by a connecting rod whether the master rocker arm and the slave rocker arm are connected together. Whether the valve moves with the movement of the main rocker arm or the movement of the slave rocker arm, so as to realize the variable movement range of the valve. When the valve is closed, the connecting rod can pass through the main rocker arm and the slave rocker arm so that The main rocker arm and the slave rocker arm move together. The shortcoming of this type of variable valve mechanism is that a camshaft is driven to rotate, and the shaft of the motor will have inertia from rotation to stop, which will cause ordinary cams and high-angle cams to be stationary. When the state is not in place, the connecting holes on the main rocker arm and the slave rocker arm are misaligned so that the connecting rod cannot pass through the connecting holes of the two at the same time, and the hydraulic drive stops immediately, avoiding the influence of inertia; The other is responsible for controlling whether the connecting rod connects the main rocker arm and the slave rocker arm together. The transmission efficiency of the motor is lower than that of the hydraulic drive, and the transmission efficiency of the hydraulic drive is high, that is, the force of the motor to push the connecting rod is not as large as that under the hydraulic drive. , now design a hydraulically driven variable valve mechanism

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