Variable-section engine body stitching bolt structure and assembling technology thereof

Abstract

The invention relates to a variable-section engine body stitching bolt structure. The variable-section engine body stitching bolt structure comprises a bolt locking sleeve, a variable-section screw, an upper crankcase and a lower crankcase. The bolt locking sleeve is provided with an inner hexagonal nut, a polished shaft assembled with the upper crankcase and a threaded blind hole. The variable-section screw is provided with an upper outer thread, a lower outer thread, a small-diameter polished rod, a large-diameter polished rod, clamping faces, transition arcs and transition fillets. A variable-section through hole is formed in the upper crankcase, and a threaded blind hole is formed in the lower crankcase. The variable-section screw is tightly screwed and assembled on the lower crankcase through a thread. The upper crankcase is installed on the lower crankcase so that the variable-section screw can be put in the through hole of the upper crankcase. The bolt locking sleeve is assembled in the through hole of the upper crankcase and is tightly screwed with the variable-section screw rod through a thread. By means of the variable-section engine body stitching bolt structure, reliability of an engine body can be obviously improved on the premise that structural arrangement of the engine body is met.

Description

technical field [0001] The invention belongs to the field of engine structure design, and in particular relates to a suture bolt structure of a variable-section engine body. Background technique [0002] The body is the skeleton of the diesel engine, and its main function is to support the moving parts of the engine, and form water channels and oil channels to ensure the cooling and lubrication of the engine. The body is also the main carrier for the installation of various accessories of the engine, and at the same time serves as a support for the engine to be installed on the car body. The diesel engine body is mainly composed of upper crankcase, lower crankcase, body suture bolts, main bearing bush, fuel injection pump drive bushing and other components. [0003] The body of a diesel engine is mainly connected to the upper crankcase and the lower crankcase through suture bolts, which are key parts of the engine. The reliability of the body suture bolts not only directly...

AI Technical Summary

Problems solved by technology

Although the body suture bolts have high tensile strength, due to the vibration load generated by the engine during operation, when the natural frequency of a certain order of vibration of the body suture bolts in the installed state is equal to or close to the vibration excitation frequency of the engine body suture parts, The body suture bolts will resonate, which will cause vibration fatigue fracture

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