Engine valves

Inactive Publication Date: 2011-06-30
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]Preferably, the outer peripheral surface of the head portion has a curved configuration. Because a high heat insulation property is ensured, it may be possible that the outer peripheral surface is pointed. However, if the surface is curved, occurrence of the pre-ignition of the air-fuel mixture may be more effectively prevented compared to the pointed surface As a heat-resistant alloy, a heat-resistant steel may be used.

Problems solved by technology

However, the re-forming process is troublesome and leads to increase of the cost.
Therefore, there is a need in the art for an engine valve that is difficult to be heated due to a high heat insulation property of an oxidized layer formed on an outer peripheral surface of a head portion.

Method used

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Embodiment Construction

[0015]Each of the additional features and teachings disclosed above and below may be utilized separately or in conjunction with other features and teachings to provide improved engine valves. Representative examples of the present invention, which examples utilize many of these additional features and teachings both separately and in conjunction with one another, will now be described in detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Therefore, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe representative examples of the invention. Moreover, various featur...

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Abstract

An engine valve according to the present teaching has a hot-forged head portion having an oxidized surface layer at a radially outer peripheral surface. The oxidized surface layer is formed during hot-forging of the head portion.

Description

[0001]This application claims priority to Japanese patent application serial number 2009-292502, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present teaching relates to engine valves made of heat-resistant alloy and having a valve head portion that is hot-forged in continuity with one end of a shaft portion.[0004]2. Description of the Related Art[0005]A process of manufacturing this kind of poppet-type engine valve is hereinafter described. As shown in FIG. 3 (a), one end of a bar member is cold-forged to form a valve intermediate body 106 having a shaft portion 102 and a head portion primary body 105 having a block-like shape and formed in series at one end of the shaft portion 102. The valve intermediate body 106 is then inserted into a casting mold 110 and heat-forged in a manner that a punch 111 presses against the head portion primary body 105. In this way, the head portion primary body 105 is ca...

Claims

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Application Information

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IPC IPC(8): F01L3/02B21K1/22
CPCF01L3/02F01L3/04Y10T29/49298F01L2101/02F01L2103/00F01L2101/00F01L2301/02F01L2301/00F01L2303/00
InventorTOMINAGA, TADAYOSHIFUJINO, MINEOYAMADA, SHIGEKI
OwnerAISAN IND CO LTD