Title:
MULTIPLE STAGE OPENING VALVE DEVICE
Document Type and Number:
Japanese Patent JP3368518
Kind Code:
B2
Abstract:
PURPOSE: To widely select the maximum, minimum or middle valve lift or opening suitable for an EGR control valve of a vehicular engine.
CONSTITUTION: An actuator 20 for controlling the lift or the opening of a valve member 16 into three stages is constituted of a first piston 26 slidably fitted in a first cylinder 24 in a housing 12, a second piston 30 slidably fitted into a second cylinder 28 integrated with it, and a third piston 46 for regulating the stroke of the first piston 26. The first piston 26 is displaced in the valve opening direction by the operating medium from a first supply and discharge port 36, and the second piston 30 is displaced in the valve opening direction by the operating medium from a second supply and discharge port 52. When the operating medium from the second supply and discharge port 52 acts on the third piston 46, the stroke of the first piston 26 is set smaller, and when the operating medium does not act on the third piston 46, the stroke of the first piston 26 is set larger. As an output member, the second piston 30 directly opens and closes the valve member 16 or opens and closes the valve member 16 through a link device.
Inventors:
Hiroshi Kamitaki
Kazutoshi Mori
Shin Koketsu
Yoshihisa Yamaki
Yasunori Daigo
Kazutoshi Mori
Shin Koketsu
Yoshihisa Yamaki
Yasunori Daigo
Application Number:
JP19892995A
Publication Date:
January 20, 2003
Filing Date:
June 30, 1995
Export Citation:
Assignee:
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
International Classes:
F01L9/10; F02M25/07; F15B15/24; F16K31/363; F02B3/06; (IPC1-7): F02M25/07; F15B15/24; F16K31/363
Domestic Patent References:
| JP6307292A | ||||
| JP5050553A | ||||
| JP547402U | ||||
| JP741008U |