Engine cylinder head and processing method of main oil gallery tappet holes of engine cylinder head

Abstract

The invention relates to an engine cylinder head and a processing method of main oil gallery tappet holes of the engine cylinder head. The engine cylinder head comprises two main oil galleries, tappet holes and valve spring mounting holes, and is specialized in that the cross sections of the main oil galleries are long circle-shaped; the long axis direction of the long circles is in the width direction of the engine cylinder head; the short axis of the long circles is in the height direction of the engine cylinder head; and the main oil galleries are communicated with the tappet holes through cross structures. The method has the advantages as follows: 1. through the change of the sand mold structure, the main oil galleries and the tappet holes adopt cast formation, the processing technology is simplified, no deep hole processing equipment is needed, the processing time is reduced, and the manufacturing cost and the processing difficulty are reduced, 2.the opening directions and the sizes of oil draining holes at the bottom of the tappet holes are adjusted, the problem of aluminium skimming cleaning difficulty is solved, and the cost waste caused by cleaning the aluminium skimming is reduced, and 3. the addition of oil draining grooves in the valve spring mounting holes cannot increase the manufacturing cost, and can effectively reduce the oil mist problem produced due to the lubricating oil gathering in counter bores.

Description

technical field [0001] The invention relates to an automobile part, in particular to an engine cylinder head and a processing method for a main oil channel and a tappet hole of the cylinder head, and belongs to the technical field of automobiles. Background technique [0002] The engine cylinder head is an important structural component that constitutes the engine. Its purpose is mainly to close the upper part of the cylinder to form the combustion chamber. It is also used as the support of the camshaft, the rocker shaft and the intake and exhaust pipes, sucking air into the cylinder, and the mixed gas burns and explodes in the combustion chamber, driving the piston to do work. from the exhaust pipe. The cylinder heads of modern engines are equipped with main oil passages and oil pools. Lubricating oil lubricates camshafts, tappets, rocker arms and other parts through the main oil passages, and then collects lubricating oil through the oil pools and returns them to the oil ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are the following problems in the structural design and processing methods of the engine cylinder head: 1. The main oil passages of the cylinder head of the engine are formed by machining, and the main oil passages that run through the cylinder head are processed by deep hole processing technology

Because the main oil passage is thin and long, it is difficult to process the deep hole, and the process requirements are high, which is time-consuming and laborious; 2. The main oil passage and the tappet hole are connected by machining methods, and sharp edges and burrs are easily formed at the penetration position. In most cases These sharp edges and burrs need to be cleaned by special equipment, and they cannot be completely removed. During the use of the engine, these burrs are easy to fall off, and enter each movement pair with the lubricating oil. This will lead to abnormal wear of the kinematic pair until it is stuck, and the engine will stop suddenly, which will affect the service life of the engine

3. The opening direction of the oil drain groove at the bottom of the tappet hole in the cylinder head oil pool is facing forward and the gap with the cylinder head bolts is small. During the processing of the cylinder head, a large amount of aluminum chips are generated, and the aluminum chips will be stuck in the oil drain groove and cannot be cleaned cleanly. During the operation of the engine, the aluminum chips are washed out by the lubricating oil and enter the main oil passage with the lubricating oil, causing abnormal wear of the crankshaft, camshaft, piston and other moving parts; 4. In order to ensure the guidance of the valve spring, the valve spring installation hole is designed as a sink During the operation of the engine, part of the lubricating oil enters the valve spring mounting hole and cannot be discharged. Due to the up and down movement of the valve spring, the lubricating oil in the counterbore is splashed, resulting in a sharp increase in the oil mist content in the oil pool. Entering the oil and gas separator on the cylinder head cover, the work load of the oil and gas separator increases, resulting in unclear separation of oil and gas, oil mist enters the combustion chamber to participate in combustion, and the engine has the problem of burning oil

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