Method for producing cylinder head and cylinder head

• US 8,191,252 B2
• Filed: 03/13/2007
• Issued: 06/05/2012
• Est. Priority Date: 03/15/2006
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nagafuchi, Hiroki
• Primary Examiner(s): Taousakis, Alexander P
• Application Number:
  US12/282,946
• Publication Number:
  US 20090165298A1
• Time in Patent Office: 1,911 Days
• Field of Search: 298/880.6, 164/10, 164/30, 164/137, 123/193.5, 123/193.3
• US Class Current: 29/888.06
• CPC Class Codes: B22C 9/103 Multipart cores
• CPC Class Codes: Y10T 29/4927 Cylinder, cylinder head or engine valve sleeve making
• CPC Class Codes: Y10T 29/49988 Metal casting

Abstract

A core portion (47) that is used to hold an upper water jacket-forming core (45) and a lower water jacket-forming core (46) with a predetermined distance maintained therebetween includes holding core portions (48) and distance maintaining core portions (50). The upper water jacket-forming core (45) and the lower water jacket-forming core (46) are split from each other at the holding core portions (48). Communication passages that provide communication between an upper water jacket and a lower water jacket are formed by the distance maintaining core portions (50).

Claims

1. A method for producing a cylinder head, comprising:

providing a core which includes;

an upper water jacket-forming core which is used to form an upper water jacket within a cylinder head;

a lower water jacket-forming core which is used to form a lower water jacket within the cylinder head; and

a core portion including a holding core portion and a distance maintaining core portion which is used to hold the upper water jacket-forming core and the lower water jacket forming core with a predetermined distance maintained between the upper water jacket-forming core and the lower water jacket forming core, said core portion connects an end portion of the holding core portion to a side end portion of the upper water jacket-forming core and a side end portion of the lower water jacket-forming core, and the core portion being split into two portions at the holding core portion;

arranging an exhaust port-forming core between the upper water jacket-forming core and the lower water jacket-forming core using the core portion; and

molding the cylinder head by pouring molten material into a die used to form the cylinder head with two split portions of the holding core portion held adjacent to each other.

2. The method according to claim 1, wherein the holding core portion that is split into the two split portions is held by a side wall of the die used to form the cylinder head.