CONTROL VALVE BODY FOR AUTOMATIC SPEED CHANGER AND METHOD OF PRODUCING THE SAME

Title:

CONTROL VALVE BODY FOR AUTOMATIC SPEED CHANGER AND METHOD OF PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2005/113177

Kind Code:

A1

Abstract:

A valve body where flow path grooves for hydraulic oil used for speed change operation of an automatic speed changer are formed between partition walls by forcing molten magnesium or magnesium alloy into a hollow section formed by a mold. In this process, the flow path grooves are formed by projections provided on the mold and projecting in the hollow section. Since the heat capacity of magnesium is small, the temperature variation width of the mold in a thermal cycle can be restricted to be small, and further, magnesium has no reactivity with the mold. As a consequence, the thickness of the projections on the mold can be reduced without causing degrading of the projections.

Inventors:

AOYAMA TOSHIHIRO (JP)
ITOU SHINICHI (JP)
MURAKAMI AKIRA (JP)
KITANO TOMOYASU (JP)

Application Number:

PCT/JP2005/009114

Publication Date:

December 01, 2005

Filing Date:

May 12, 2005

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
AOYAMA TOSHIHIRO (JP)
ITOU SHINICHI (JP)
MURAKAMI AKIRA (JP)
KITANO TOMOYASU (JP)

International Classes:

F16H61/00; B22D17/00; B22D17/22; B22D21/00; F16H61/02; F16H61/66; F16H61/68; (IPC1-7): B22D17/00; B22D17/22; F16H61/00

Foreign References:

JP2001280457A	2001-10-10
JPH10238628A	1998-09-08
JP3286224B2	2002-05-27
JPH11124692A	1999-05-11
JP2000320502A	2000-11-24
JP2001280457A	2001-10-10
EP1097768A1	2001-05-09

Other References: