Double-cam-shaft switch supporting point type mode-switching valve driving system

Abstract

The invention discloses a double-cam-shaft switch supporting point type mode-switching valve driving system and belongs to the field of engine valve driving, cylinder deactivation and auxiliary braking. The system mainly comprises an intake valve assembly, an exhaust valve assembly, an exhaust braking cam, an exhaust driving cam, an intake driving cam, an intake braking cam, an exhaust braking rocker arm, an exhaust driving rocker arm, an intake driving rocker arm, an intake braking rocker arm, an exhaust braking supporting point assembly, an exhaust driving supporting point assembly, an intake driving supporting point assembly and an intake braking supporting point assembly. By controlling the states of all supporting points, various modes of four-stroke driving, two-stroke braking, cylinder deactivation and the like are achieved, and low-oil-consumption, low-emission and efficient braking is achieved. The double-cam-shaft switch supporting point type mode-switching valve driving system is oriented to actual application, the number of moving parts is small, the structure is simple and compact, the reliability is high, the cost is low, and the energy consumption is low.

Description

technical field [0001] The invention relates to a dual-camshaft switch fulcrum variable-mode valve drive system, which belongs to the fields of engine valve drive, cylinder deactivation and auxiliary braking. Background technique [0002] With the rapid increase of the number of engines, energy and environmental issues have become one of the major issues restricting my country's sustainable development. Because of its ability to effectively reduce engine fuel consumption and emissions, cylinder deactivation technology has attracted much attention. Studies have shown that when cylinders are deactivated, completely closing the intake and exhaust valves can effectively reduce pumping losses and improve the ability of cylinder deactivation technology to reduce fuel consumption and emissions. [0003] People pay more and more attention to vehicle safety, and more and more countries list the auxiliary braking system as one of the necessary accessories for vehicles. However, most...

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Problems solved by technology

According to the report of the company (SAE 2016-01-8061), the HPD mechanism has problems such as serious leakage

In addition, this mechanism also has problems such as a large number of moving parts and a large mass caused by both the drive and brake adjustment mechanisms being installed on the rocker arm, which is not conducive to the low energy consumption of the valve drive system; in addition, the motion inertia of the rocker arm is large. The contact parts of the system components are prone to damage

The driving oil of this mechanism is guided from the fixed fulcrum shaft of the rocker arm to the movable fulcrum of the rocker arm to adjust the driving and braking adjustment mechanism. The oil circuit is relatively complicated and difficult to process.

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