A full-axis cylinder head bolt tightening method compatible with four and six cylinders

Abstract

The invention discloses a whole-shaft cylinder head bolt tightening method compatible with four cylinders and six cylinders. With the method, whole-shaft cylinder head bolts of a four-cylinder dieselengine and whole-shaft cylinder head bolts of a six-cylinder diesel engine are tightened respectively by the aid of a 18-shaft tightening machine; when the cylinder head bolts of the four-cylinder diesel engine are tightened, the cylinder head bolts of whole shafts of the four-cylinder diesel engine are tightened simultaneously by the aid of the 18-shaft tightening machine according to the cylinder head bolt tightening technology; and when the cylinder head bolts of the six-cylinder diesel engine are tightened, the cylinder head bolts of the six-cylinder diesel engine are divided into two parts including a tightening area I and a tightening area II according to the number of the bolts firstly, then redundant tightening shafts of the 18-shaft tightening machine are shielded according to thenumber of the bolts in the tightening area I and the number of the bolts in the tightening area II, and the cylinder head bolts in the two areas are tightened respectively according to the cylinder head bolt tightening technology. With the method, the whole-shaft cylinder head bolts of the four-cylinder diesel engine and the whole-shaft cylinder head bolts of the six-cylinder diesel engine can betightened by the aid of one 18-shaft tightening machine, so that the problems that large space is occupied by multiple tightening machines and the cost is high are solved.

Description

technical field [0001] The invention relates to the technical field of engine assembly, more specifically, it relates to a method for tightening all-axis cylinder head bolts compatible with four and six cylinders. Background technique [0002] The cylinder head is one of the parts with the most complex structure and the highest mechanical load and heat load among the many parts of the diesel engine. The cylinder head bolts are used to tighten the connection between them. If the torque is unstable, the torque of each bolt is uneven, and the process cannot be achieved, which will directly lead to air, water and oil leakage in the cylinder head gasket, thereby reducing the performance of the diesel engine. , in order to ensure that the cylinder head is evenly stressed during the process of assembling the cylinder head of the engine, the usual practice is to use all-axis tightening, for example: a four-cylinder engine has 18 bolts, that is, an 18-axis tightening machine is used ...

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Problems solved by technology

[0002] The cylinder head is one of the parts with the most complex structure and the highest mechanical load and heat load among the many parts of the diesel engine. The cylinder head bolts are used to tighten the connection between them. If the torque is unstable, the torque of each bolt is uneven, and the process cannot be achieved, which will directly lead to air, water and oil leakage in the cylinder head gasket, thereby reducing the performance of the diesel engine. , in order to ensure that the cylinder head is evenly stressed during the process of assembling the cylinder head of the engine, the usual practice is to use all-axis tightening, for example: a four-cylinder engine has 18 bolts, that is, an 18-axis tightening machine is used to tighten 18 bolts at the same time , the six-cylinder engine has 26 bolts, that is, a 26-axis tightening machine is used to tighten 26 bolts at the same time. This tightening method makes diesel engines with different numbers of cylinders have their own tightening machines. The investment is huge and the production cost is very high. High, and, on the mixed production line of four-cylinder and six-cylinder diesel engines, it is necessary to install an 18-axis screwing machine and a 26-axis screwing machine at the same time, which takes up a lot of space and hinders continuous and efficient production

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