Variable valve lift driving device

Abstract

The invention discloses a variable valve lift driving device, and relates to an engine component which is used for prolonging the service lives of parts and reducing the machining cost and fuel consumption of an engine. The variable valve lift driving device comprises a first valve, a second valve, a first valve rocker, a second valve rocker, a camshaft, a first swing arm, a first swing arm adjusting frame, a second swing arm and a second swing arm adjusting frame, the camshaft drives the first swing arm to swing around a first rotating center when rotating, so that the first valve is opened or closed, the camshaft drives the second swing arm to swing around a third rotating center when rotating, so that the second valve is opened or closed, the first swing arm adjusting frame rotates around a first shaft of the first swing arm adjusting frame to drive a first driving portion to rotate around the first shaft and adjust the position of the first rotating center, and the second swing arm adjusting frame rotates around a second shaft of the second swing arm adjusting frame to drive a second driving portion to rotate around the second shaft and adjust the position of the third rotating center.

Description

technical field [0001] The invention relates to engine components, in particular to a variable valve lift driving device. Background technique [0002] The valve is an important part of the engine, which is used to input fuel into the engine and discharge the exhaust gas after combustion. In the field of engines, the valve lift refers to the height that the valve moves from just opening to fully opening, that is, the opening height of the valve. Different cam profiles of the camshafts used in the engine will result in different valve lifts. The valve lift of the traditional engine is fixed, that is, there is only one cam profile of the camshaft, and the lift design is a balance choice for the engine under all working conditions, so it is impossible for the lift to make the engine Both the high-speed and low-speed areas are well responded. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque, but only gets a relatively balance...

AI Technical Summary

Problems solved by technology

[0005] However, in the process of using the variable valve lift drive device to change the valve lift, the camshaft, valve connecting rod and other related components are subjected to different degrees of impact load, which reduces the service life of the components.

Moreover, the combined camshaft is more complex and heavy than the traditional camshaft, which increases the processing cost and fuel consumption of the engine.

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