Engine variable valve lift mechanism

Abstract

The invention discloses a variable vehicle lift mechanism of an engine. An air intake / exhaust pier, an air intake / exhaust valve, a cam shaft base and a cam shaft are arranged on a cylinder head of the engine; a long air intake cam, a short air intake cam and an air exhaust cam are arranged on the cam shaft; an air intake valve rocker is provided with a high-opening degree rocker and a general-opening degree rocker; a roller of the high-opening degree rocker is contacted with the long air intake cam; a roller of the general-opening degree rocker is contacted with the short air intake cam; and a pressing part of the general-opening degree rocker is contacted with the air intake valve. The air intake / exhaust rocker is made from a light metal alloy materials, so that the rotation inert weight can be greatly reduced. A via hole of the high-opening degree rocker is communicated with a via hole of the general-opening degree rocker to form an oil hydraulic cylinder, so that the high-opening degree rocker and the general-opening degree rocker can be in respective swing or inter-moving state, the opening degree of the air intake valve is changed, and the engine can obtain the most proper power in both a low-speed operation state and a high-speed operation state.

Description

【Technical field】 [0001] The present invention relates to a variable valve lift mechanism of an engine, especially the variable valve lift mechanism of an engine that can make the engine obtain optimum power under low-speed running state and high-speed running state. 【Background technique】 [0002] For known configurations see figure 1 , the first and second rocker arms 21, 22 are set above the steam valve 2, wherein the second rocker arm 22 is a multi-link member, which can be pushed separately by the first and second rocker arms 21, 22 Steam valve 2, to make the lift of steam valve 2 change, that is, when the first rocker arm 21 is pushing the steam valve 2, the steam valve 2 is a small opening lift; when the second rocker arm 22 is pushing the steam valve 2 o'clock, this steam valve 2 is the lift of the maximum opening, thereby, to switch between the intake and exhaust valves of different steam valve 2 lifts when the high and low speeds of the engine 1 are running. [0...

AI Technical Summary

Problems solved by technology

Because the first and second rocker arms 21, 22 are made of heavy cast iron material, the moment of inertia is relatively large, so the force of the valve spring 23 also needs to be set stronger to overcome the moment of inertia. , which also makes the engine power loss larger; in addition, the second rocker arm 22 is a multi-link structure, because of its complex structure and a considerable operating space when it is actuated, the cylinder head 1a of the engine 1 Relatively large size is necessary to have enough space for the second rocker arm 22 to move; the large size of the cylinder head 1a of the engine 1 will undoubtedly increase the cost of the engine 1 and increase the difficulty of the engineering design of the engine 1. As far as the vehicle is concerned, the space for installing the engine 1 is already limited

Images