Four-valve cylinder cover for lightweight engine

[0025] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying The description does not indicate or imply that the pointed device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0027] Such as image 3 with Figure 4 Shown is a four-valve cylinder head for a light engine provided by the present invention. The cylinder head is provided with a push rod hole 3 and a water jacket 4, and one side of the cylinder head is provided with an intake port 1 and the other side An exhaust passage 2 is provided. The intake passage 1 is used to establish a passage between the intake manifold and the combustion chamber of the cylinder to provide a certain flow rate and form a certain air flow pattern for combustion. The cylinder head is internally separated The water jacket is divided into an upper water jacket 41 and a lower water jacket 42. The upper water jacket 41 is arranged on the inner upper side of the cylinder head and is mainly used for cooling the cylinder head. The upper top plate, air passage, etc., the lower water jacket 42 is arranged on the lower inner side of the cylinder head, and is mainly used to cool the bottom plate, air passage, etc., on the lower side of the cylinder head. The upper water jacket 41 and the lower water jacket 42 are There is a channeling hole 5 connecting the two; the cylinder head cooling water first enters the lower water jacket 42 from the exhaust side, and preferentially cools the exhaust duct 2 and the exhaust nose area with a higher temperature, and then flows through each nose area and passes Controlling the flow cross-sectional area of ​​each water inlet can achieve the effect of controlling the flow of different flows of coolant in different areas, effectively improving the overall cooling efficiency of the cylinder head, and finally the cooling water flows between the upper water jacket 41 and the lower water jacket 42 on the intake side. The blow-by hole 5 enters the upper water jacket 41, and then flows out of the cylinder head; the adjacent cylinders share an intake port 1, and the structure of the cylinders to share the same intake port 1 is adopted to avoid the intake of the combined intake port 1. The airflow interferes with each other; the push rod hole 3 is arranged close to the air inlet 1, so that the lubricating oil does not pass through the high temperature area, effectively avoiding the problem of lubricating oil aging, and effectively improving the maintenance and oil change cycle.

[0028] Further, between the upper water jacket 41 and the lower water jacket 42, a horizontally arranged intermediate partition 6 is also provided. The intermediate partition 6 has a significant contribution to improving the overall strength and rigidity of the cylinder head. The hole 5 is vertically arranged on the intermediate partition 6.

[0029] Wherein, the upper water jacket 41 and the lower water jacket 42 are cast separately, and a complete intermediate partition 6 can be formed between the upper and lower water jackets 42, and the water channel 5 is also connected to the Upper water jacket 41 and lower water jacket 42.

[0030] The inner cylinder head is also provided with a fuel injector processing part, and the fuel injector processing part is processed with a vertical injector bottom hole 7 for installing the fuel injector; thus, it is more convenient to install the fuel injector. Avoid adding additional injector mounting parts to improve the overall strength and rigidity of the cylinder head.

[0031] In order to facilitate the manufacture, the processing part of the fuel injector and the upper water jacket 41 and the lower water jacket 42 are integrally cast.

[0032] Wherein, the upper water jacket 41 and the lower water jacket 42 are respectively arranged around the injector processing part, and a section of wall thickness is left between the bottom hole 7 of the injector and the upper water jacket 41 and the lower water jacket 42; Separate the fuel injector and cooling water.

[0033] Such as Image 6 As shown, each of the spacer cylinders is provided with a lower water jacket 42, and a reinforcing vertical plate 9 is provided at the connection of the adjacent spacer cylinders on the outer periphery of each of the lower water jacket 42; It refers to the cooling water flow direction 10; it is used to reduce the mutual influence of each cylinder while increasing the overall rigidity of the cylinder head; the intermediate partition 6, the reinforced vertical plate 9, and the directly cast injector bottom hole 7 can effectively improve the cylinder The strength and rigidity of the head can reduce the deformation of the cylinder head, and can increase the sealing performance of the cylinder gasket to meet the strength requirements of the high-strength light cylinder head.

[0034] Such as Figure 5 As shown, the intake port 8 is machined to form a smooth surface, which reduces the problem of air intake interception caused by casting tolerances and improves air intake efficiency.

[0035] For the arrangement of different valve angles, the technical solution that each cylinder share one intake port 1 is also applicable.

[0036] It can be seen from the above embodiments that the present invention can not only avoid the mutual interference of the intake air flow and improve the intake efficiency; it can also avoid the problem of lubricating oil aging, and can also improve the cooling efficiency.

[0037] The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.