One-cylinder multiple-cam combined type cam shaft
A multi-cam, combined technology, applied in valve details, engine components, machine/engine, etc., can solve the problems of inability to optimize matching, process limitations of integral camshafts, and high processing costs of cams on integral camshafts. Cost reduction, high braking power, weight saving effect
Inactive Publication Date: 2014-08-06
CHINA FIRST AUTOMOBILE
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Problems solved by technology
[0004] In general, the camshafts on the existing diesel engines mainly have the following problems: 1. The cam on the integral camshaft can only use the same material as the shaft, and the material cannot be optimally matched according to the requirements; 2. The overall The cost of cam processing on the type camshaft is high, which is not conducive to the realization of flexible production; 3. The integral camshaft is limited by the process, and the cam spacing and position cannot be flexibly selected; 4. Brake or internal EGR lobe and exhaust lobe design On a cam, the profile is limited by the exhaust cam profile at design time, making it difficult to achieve optimum performance
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[0018] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0019] Such as figure 1 As shown, the combined camshaft 1 in the embodiment is a one-cylinder three-cam structure, which is mainly composed of a shaft 1, an intake cam 2, an independent cam 3 and an exhaust cam 4, and the independent cam 3 is used as a braking cam. The independent cam 3 is located between the exhaust cam 4 and the intake cam 2 .
[0020] In the above embodiment, the shaft 1, the intake cam 2, the exhaust cam 4 and the independent cam 3 are separately processed from the same or different materials, and then assembled and combined into a whole, the positional relationship, function, width, etc. of each cam All can be adjusted according to actual needs. As mentioned above, the profile of the brake cam is designed completely according to the engine braking requirements.
[0021] In the above embodiments, the independent cam 3 is used as a brake...
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The invention relates to a one-cylinder multiple-cam combined type cam shaft. The one-cylinder multiple-cam combined type cam shaft comprises a shaft, wherein a gas inlet cam and an exhaust cam are arranged on the shaft. The one-cylinder multiple-cam combined type cam shaft is characterized in that at least one independent cam is further arranged on the shaft. The one-cylinder multiple-cam combined type cam shaft is simple in structure, on the premise that reliability of the torsional strength of the cams and the cam shaft is ensured and the functions of conventional gas inlet cams and conventional exhaust cams are ensured, extended functions are added to the independent cam, and therefore optimal matching of material can be more conveniently conducted according to the requirements, machining cost is reduced, and cam profiles are optimized.
Description
technical field [0001] The invention relates to a camshaft applied to a diesel engine, in particular to a combined camshaft with one cylinder and multiple cams, and belongs to the technical field of diesel engine accessories. Background technique [0002] At present, for engines with engine braking, most of the integral camshafts are one-cylinder two-cam structure (only intake cam and exhaust cam), and the brake lobe and exhaust lobe are designed to one on cam. [0003] In the rapid development of diesel engine electronic control technology, in order to reduce pollutant emissions, EGR (exhaust gas recirculation) technology has developed rapidly. The built-in EGR technology is to change the exhaust lift of the camshaft. The cam lift of the camshaft is something that controls the time and displacement of the valve opening or closing. In a normal engine, after the intake valve opens, the exhaust valve will close quickly. Changing the exhaust valve camshaft profile will make th...
Claims
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IPC IPC(8): F01L1/047F01L1/08
Inventor 钱仕全王一江江伟陆金龙杨振国王颖张栋梁王建武刘振威
Owner CHINA FIRST AUTOMOBILE