Engine valve mechanism, engine and vehicle
A valve mechanism and engine technology, which is applied in engine control, engine components, machines/engines, etc., can solve the problems of early exhaust valve opening time, exhaust gas is not discharged in time, and achieve the effect of reducing the probability of NVH generation
Active Publication Date: 2020-11-20
WEICHAI POWER CO LTD
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Problems solved by technology
When the existing engine gas distribution mechanism realizes cold start, the opening time of the exhaust valve is earlier than usual, which will cause part of the exhaust gas to be discharged in time, and the exhaust gas not discharged in time will be directly discharged from the intake valve, causing NVH problems
Method used
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. 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 some structures related to the present invention are shown in the drawings but not all structures.
[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two ...
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The invention relates to an engine gas distribution mechanism, an engine and a vehicle. The engine gas distribution mechanism comprises a cam shaft and a rocker arm assembly. The rocker arm assembly comprises an exhaust rocker arm and a waste gas rocker arm. The cam shaft comprises an inner shaft and an outer shaft. A waste gas cam is fixed to the outer shaft. An exhaust cam is fixed to the innershaft. The inner shaft and the outer shaft can synchronously rotate. The inner shaft can rotate in the outer shaft by a preset angle so that the inner shaft can have a first position and a second position relative to the outer shaft. The exhaust opening angle generated when the inner shaft is located at the first position is ahead of the exhaust opening angle generated when the inner shaft is located at the second position. When the inner shaft is located at the first position, the waste gas rocker arm can interfere with the exhaust rocker arm so that the exhaust closing angle can be the sameas the exhaust closing angle generated when the inner shaft is located at the second position. When the inner shaft and the outer shaft are located at the first position, the waste gas rocker arm caninterfere with the exhaust rocker arm to hinder recovery of the exhaust rocker arm, and therefore an exhaust valve which is opened early can be normally closed through interference of the waste gas rocker arm and it can be ensured that waste gas is discharged from the exhaust valve.
Description
technical field [0001] The invention relates to the technical field of engines, in particular to an engine valve mechanism, an engine and a vehicle. Background technique [0002] The gas distribution mechanism is one of the two key mechanisms on the engine. The gas distribution mechanism is the control mechanism for intake and exhaust. The cylinder supplies combustible mixture (gasoline engine) or fresh air (diesel engine) and discharges exhaust gas in time to meet the intake and exhaust requirements of the engine. The performance requirements of the engine are met through reasonable intake and exhaust time design. The valve mechanism has many moving parts and is affected by many other factors. The stress of each part during the movement is relatively complicated, and the precision and strength of each part are required to be high. Reliability matters a lot. When the existing engine valve mechanism realizes cold start, the opening time of the exhaust valve is earlier than...
Claims
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IPC IPC(8): F01L13/00F01L1/047F01L1/18F02D13/02
CPCF01L1/047F01L1/181F01L13/00F01L2001/0473F02D13/0249F02D13/0253F02D13/0276
Inventor 李栋温鹏博杨燕楠王刚乔芳于健陈广茂
Owner WEICHAI POWER CO LTD