Engine cylinder body top surface inclined hole drilling fixture

Abstract

The invention discloses an engine cylinder body top surface inclined hole drilling fixture. The engine cylinder body top surface inclined hole drilling fixture comprises a base; the upper end surface of the base is provided with a trapezoidal supporting body; a left supporting block and a right supporting block are symmetrically arranged on the two sides of an inclined surface at the front end of the supporting body; a first positioning pin and a second positioning pin are arranged in the positions, between the upper end of the left supporting block and the upper end of the right supporting block, of the inclined surface of the supporting body; a detachable installation seat is arranged in the middle of the inclined surface of the supporting body, and a connection rod penetrating through a cylinder sleeve hole of an engine cylinder body during working is installed on the detachable installation seat; the upper end of the connection rod is sleeved with a drill sleeve installation plate and a pressing plate in sequence, and a lock nut for locking the pressing plate is installed at the top of the connection rod in a screwing mode; and the drill sleeve installation plate is provided with a plurality of drill sleeves distributed at intervals. According to the structure of the engine cylinder body top surface inclined hole drilling fixture, the supporting body, the positioning pins, the detachable installation seat, the connection rod and other components are used in a matched mode, and positioning and clamping of the engine cylinder body can be conducted conveniently and quickly, so that the firmness and stability of drilling machining of inclined holes in the top surface of the clamped engine cylinder body are improved.

Description

Technical field: [0001] The invention relates to the field of engine manufacturing, in particular to a jig for drilling inclined holes on the top surface of an engine cylinder block. Background technique: [0002] The engine is composed of two parts, the cylinder block and the cylinder head, which are connected to each other by bolts. The cylinder body material should have sufficient strength, good castability and machinability, and the price should be low, so the commonly used cylinder body materials are cast iron and alloy cast iron. However, the use of aluminum alloy cylinder blocks is becoming more and more common, because aluminum alloy cylinder blocks are light in weight, have good thermal conductivity, and the capacity of coolant can be reduced. After starting, the cylinder body reaches the working temperature quickly, and the thermal expansion coefficient is exactly the same as that of the aluminum piston. After heating, the gap changes little, which can reduce impa...

AI Technical Summary

Problems solved by technology

[0003]The structure and shape of the engine cylinder block is relatively complicated, and there are many inclined holes on the top surface of the cylinder block. Before the inclined holes are processed, clamping is required to ensure the firmness of the clamping And the stability directly leads to the machining accuracy of the inclined hole. If the machining of the inclined hole fails to meet the quality requirements, the performance of the engine will be seriously affected.

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