Valve lift variable system and engine
A valve lift and variable technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of poor adjustment accuracy, difficult control of the adjustment process, complex structure of the driving device, etc., to achieve convenient operation and simple structure Effect
Active Publication Date: 2019-04-19
WEICHAI POWER CO LTD
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Problems solved by technology
[0006] The object of the present invention is to provide a variable valve lift system and engine, which can solve the problems of complex structure, difficult control of the adjustment process and poor adjustment accuracy in the driving device of the existing variable valve lift valve train
Method used
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[0033] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings but not all of them.
[0034] like figure 1 As shown, this embodiment provides a variable valve lift system, including a camshaft 11, a cam assembly, a shift fork shaft 21, a linear drive unit (not shown in the figure) and a shift fork assembly. Wherein the cam assembly includes two first stoppers 12 fixed on the camshaft 11, and two cams 13 slidingly sle...
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The invention relates to the field of engines, and discloses a valve lift variable system and an engine. The valve lift variable system comprises a cam shaft, at least one cam assembly and shifting fork assemblies, wherein the cam assembly comprises two first limiting pieces fixedly arranged on the cam shaft, and two cams which sleeve the cam shaft in a sliding mode and are located between the twofirst limiting pieces, the two cams correspond to different valve working modes and can synchronously rotate along with the cam shaft, each cam assembly is correspondingly provided with two shiftingfork assemblies, each shifting fork assembly can push the two cams to move towards the other shifting fork assembly, so that the two cams are clamped between the corresponding shifting fork assembly and the first limiting piece. According to the system, the shifting fork assemblies drive the cams to move in an axial direction, so that the two cams are clamped between the shifting fork assembly andthe first limiting piece to achieve switching of the cams used for working, furthermore, switching of a valve early closing mode and a valve normal closing mode is achieved, the structure is simple,and operation is convenient.
Description
technical field [0001] The invention relates to the field of engines, in particular to a variable valve lift system and an engine. Background technique [0002] Valve timing directly affects the intake and exhaust performance of the engine, and has an important impact on the quality of the combustion process. Its main function is to open and close the intake and exhaust valves of each cylinder at regular intervals according to the working sequence and working cycle requirements of the engine. , so that air enters the cylinder and exhaust gas is discharged from the cylinder. [0003] The gas distribution structure mainly includes two types: fixed gas distribution phase gas distribution mechanism and valve lift variable valve lift. The requirements of the speed and load rate on the valve lift limit the further improvement of the thermal efficiency of the diesel engine. [0004] The variable valve lift valve mechanism can provide variable valve opening and closing time or lif...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01L13/00
CPCF01L13/0047F01L2013/0052
Inventor 战强李志强韩峰王飞郭圣刚
Owner WEICHAI POWER CO LTD