Cylinder block of engine

Abstract

The invention discloses a cylinder block of an engine. The cylinder block is connected with a cylinder head through studs in a fastening manner; threaded parts of screw holes, corresponding to the studs, in the cylinder block are located below a cylinder liner side within the travel range of a piston; after the fastening connection of the studs, a lower supporting cylinder head stud-screw hole structure is formed; a stress generated by a tightening torque for mounting the cylinder head is shifted down and dispersed to lower supporting parts of a cylinder liner by virtue of lower supporting cylinder cover studs; a plurality of transverse flow cooling waterways for cooling the wall between two adjacent cylinders are arranged in the wall between the two adjacent cylinders of cylinder block of the engine; and the cylinder liner adopts a sliding-matched thin-walled cylinder liner. According to the cylinder block of the engine, lower supporting screw holes are adopted to mount the cylinder head studs in the cylinder block, the stress deformation of the cylinder liner caused after the studs are screwed can be effectively avoided, and thus the cylinder bore is effectively enlarged to increase the displacement of the engine.

Description

technical field [0001] The invention relates to the technical field of engine machinery, in particular to a corresponding structure of a cylinder bore of an engine cylinder block. Background technique [0002] At present, the connection between the traditional engine cylinder block and the cylinder head adopts a bolt installation structure, that is, the top surface of the cylinder block is fastened to the cylinder head through bolts. This connection method is simple in structure and good in manufacturability, and is widely used. However, this structure also has disadvantages. Since the thread of the bolt is located on the upper side of the cylinder liner within the piston stroke range after the fastening connection, the bolt stress will be concentrated on the upper part after the bolt is tightened, so the cylinder liner within the piston stroke range is easy to cause The application of deformation makes the diameter of the cylinder bore unfavorable, so that the displacement ...

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Problems solved by technology

However, this structure also has disadvantages. Since the thread of the bolt is located on the upper side of the cylinder liner within the piston stroke range after the fastening connection, the bolt stress will be concentrated on the upper part after the bolt is tightened, so the cylinder liner within the piston stroke range is easy to cause The application of deformation makes the diameter of the cylinder bore unfavorable, so that the displacement of the engine cannot be effectively increased by increasing the diameter of the cylinder bore. At the same time, the ratio of the diameter of the cylinder bore to the center distance of the cylinder bore is small, which will lead to poor compactness of the engine block layout.

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