Measuring Tool for Top Dead Center of Diesel Engine

Abstract

The invention discloses a measurement tool for a top dead center of a diesel engine. The measurement tool comprises a support and a positioning piece. The support comprises a crank small-head positioning portion and a top dead center pointer measurement portion. A cylinder positioning hole penetrating through the upper surface and the lower surface is formed in the middle of the crank small-head positioning portion. The cylinder positioning hole is in clearance fit with the outer circle of a crank small head so that the support can be positioned. A long-key groove axially extending is formed in the inner circumference face of the cylinder positioning hole; the top dead center pointer measurement portion extends vertically upwards from the outer side face of the crank small-head positioning portion along the long-key groove, and a top dead center pointer measurement groove with a certain width is formed in the top of the top dead center pointer measurement portion. The positioning piece comprises a hollow positioning block assembly or a solid positioning block, one side of the hollow positioning block assembly or one side of the solid positioning block is matched with the long-key groove and the other side of the hollow positioning block assembly or the other side of the solid positioning block is matched with a key groove of the crank small head so that the support can be positioned. Whether a piston of the diesel engine is located at the top dead center position or not can be accurately detected by the measurement tool, and therefore the assembly quality of a part of components is guaranteed.

Description

technical field [0001] The invention relates to the field of diesel engines, in particular to a measuring tool for the top dead center of a diesel engine. Background technique [0002] Parts of the diesel engine require the piston to be at the top dead center position during assembly. In the traditional assembly process, these parts are installed by visually checking the top dead center position of the piston before the cylinder head is assembled. [0003] In the existing assembly process, the assembly of this part of the parts is after the cylinder head is assembled. At this time, the specific position of the piston cannot be directly observed. It can only be observed from the outside to see if the keyway of the small head of the crankshaft is aligned with the top dead center finger above it. For positive, the top dead center pointer is threaded at one end of the gear chamber, and is connected to the gear chamber through the thread, and the position of the top dead center p...

AI Technical Summary

Problems solved by technology

[0004] Use your eyes to directly observe whether there is a large error in the alignment between the keyway of the small head of the crankshaft and the top dead center pointer above it. After analysis, when the keyway of the small head of the crankshaft is not aligned with the top dead center pointer above it, the piston will go up. Inaccurate stop points will affect the assembly quality of this part, resulting in increased oil consumption, leakage and increased fuel consumption, seriously affecting engine performance

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