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Method for producing hallow engine valve

A technology of engine valve and manufacturing method, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., and can solve problems such as engine failures

Inactive Publication Date: 2012-07-18
MITSUBISHI HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the engine valve is manufactured in a hollow shape, the above-mentioned problem becomes remarkable, and there is a possibility that engine failure may be caused.
However, the above-mentioned conventional manufacturing method is not aimed at hollow engine valves that take countermeasures against the above-mentioned problems.

Method used

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  • Method for producing hallow engine valve
  • Method for producing hallow engine valve
  • Method for producing hallow engine valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] First, if image 3 As shown, the hollow engine valve 1 manufactured by the manufacturing method according to the present invention is a member used as an intake valve or an exhaust valve of an engine in a vehicle or the like, and includes a metal sodium N injected with coolant. The valve body 10 and the shaft end seal member 15 engaged with the shaft end of the valve body 10 .

[0027] The valve main body 10 is a member integrally formed with the valve head 11 and the hollow shaft 12 , and a hollow hole 13 is formed inside the valve head 11 across the hollow shaft 12 . In addition, the maximum wall thickness of the neck portion 14 , which is a connection portion between the valve head portion 11 and the hollow shaft portion 12 , is formed thicker than the wall thickness of the hollow shaft portion 12 . Then, the shaft end seal member 15 is joined to the base end (upper end) of the valve main body 10 in a state where metallic sodium N is injected.

[0028] That is, the...

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PUM

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Abstract

Provided is a method for producing a hallow engine valve which can easily produce a hallow engine valve in which strength is improved and weight is reduced. Specifically, provided is a method for producing a hallow engine valve which involves gradually reducing the size of the outer diameter and inner diameter of a hallow shaft of a semi-finished product (10a), sequentially inserting the hallow shaft into a plurality of molding holes (M1, M2', M(m-1), Mm, M(n-1), Mn) having different hole shapes so as to gradually extend the length of the hallow shaft, and forming the hallow shaft into a predetermined shape by sequentially performing said drawing process, wherein the semi-finished product (10a) is subjected to heat treatment such that the hardness thereof is equal to or less than a predetermined hardness, and the maximum thickness (t2'); between the hallow shaft and an umbrella portion connected to the bottom edge of the hallow shaft is formed to be thicker than the thickness (t2) of the hallow shaft by means of molding hole (M2') of a die (Di2') which is adjusted to have a specific length (L2') and maximum inner diameter (D2').

Description

technical field [0001] The present invention relates to a method of manufacturing a hollow engine valve that achieves increased strength and reduced weight. Background technique [0002] In recent years, in accordance with the high output and high performance of the engine, various proposals have been made to form a hollow inside the engine valve and seal metallic sodium for coolant in the hollow. As a result, compared with a solid engine valve, not only weight reduction is achieved, but also thermal conductivity is improved due to the enclosed metal sodium. Such a conventional method of manufacturing a hollow engine valve is disclosed in Patent Document 1, for example. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent No. 4390291 [0006] Here, when the engine valve is closed, the valve head is in strong contact with the valve seat, and especially in the engine valve for the exhaust valve, since it is continuously heated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L3/20F01L3/14F01L3/24
CPCB23P15/002F01L3/00B21C23/183B21K1/22F01L3/14Y10T29/49298Y10T29/49307Y10T29/49309Y10T29/49405
Inventor 森井宏和吉村豹治
Owner MITSUBISHI HEAVY IND LTD