Manufacturing method of hollow valve

Abstract

The present invention relates to a new method of manufacturing a hollow valve which is easy to manufacture and can improve operability and productivity. According to the method for manufacturing a hollow valve for an internal combustion engine of the present invention, the end face of the valve head (11) of the primary semi-finished product (30) is processed to form a secondary semi-finished product (40) having a space (13), the space (13) extending from the lower side of the valve head (11) to the middle part of the valve stem (12), and then sealing the space part (13) through welding steps and cutting steps, so that the shape of the space part (13) can be freely adjusted , and can produce hollow valves with accurate dimensions, and because the operation is very easy and the operation time is short, it can improve productivity.

Description

technical field [0001] The present invention relates to a new method of manufacturing a hollow valve which is easy to manufacture and can improve operability and productivity. Background technique [0002] Generally, an internal combustion engine includes a valve for opening and closing a combustion chamber. [0003] The valve is composed of a valve head and a valve stem extending upward from the rear side of the valve head, which is quickly raised and lowered by a cam provided in the internal combustion engine, so as to be able to open and close the intake port and the exhaust port formed in the combustion chamber. [0004] However, in this valve, the valve head is heated continuously due to the heat generated when the fuel burns in the combustion chamber of the internal combustion engine, and due to the thus heated valve, the fuel supplied to the interior of the combustion chamber burns earlier than the preset combustion time time, so knocking often occurs. [0005] In p...

AI Technical Summary

Problems solved by technology

[0013] However, since the method disclosed in Laid-Open Patent No. 10-1998-068150 utilizes a drilling machine to form the space portion 13, the volume of the space portion 13 formed inside the valve body 10, especially the space formed inside the valve head 11 The volume of the part 13 is very small, thus the heat applied to the valve head 11 cannot be effectively cooled

[0014] On the contrary, although the disclosed method of Authorized Patent No. 10-1247896 can expand the volume of the space 13 formed in the valve body 10, especially the volume of the space 13 formed in the valve head 11, it is difficult to manufacture into accurate dimensions, and the time required for manufacturing is long, resulting in reduced productivity

Images