Title:
EXHAUST GAS REFLUX CONTROL VALVE
Document Type and Number:
Japanese Patent JP3940862
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent valve leakage by an assembling error and a thermal expansion difference, and reduce a driving load in a double seat valve system exhaust gas reflux control(EGR) valve.
SOLUTION: Two valve seats 22 and 23 are arranged in a valve housing 21 so as to be vertically opposed to each other, and a single valve shaft 32 is penetrated through the center of both valve seats 22 and 23, and two valve elements 36 and 37 are fixed to the valve shaft 32. The lower valve element 37 is thickly formed of heat resistant/abrasion resistant metal, but the upper valve element 36 is formed of a heat resistant/abrasion resistant elastic plate material such as a thin stainless steel plate so as to be elastically deformable. In this constitution, even if an interval between both valve elements 36 and 37 and an interval between both valve seats 22 and 23 do not accurately coincide with each other by an assembling error and a thermal expansion difference, its error can be absorbed by elastic deformation of the upper valve element 36, the two valve elements 36 and 37 can be reliably seated on the two valve seats 22 and 23, and valve leakage can be reliably prevented.
Inventors:
Ichiyoshi Watanabe
Tokuro Shibata
Tokuro Shibata
Application Number:
JP33134497A
Publication Date:
July 04, 2007
Filing Date:
December 02, 1997
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F02M25/07; F16K1/44; F16K31/06; (IPC1-7): F16K1/44; F02M25/07; F16K31/06
Domestic Patent References:
| JP9072250A | ||||
| JP52088820A | ||||
| JP49014533U | ||||
| JP58031471U |
Foreign References:
| EP0770775A1 | ||||
| DE3500802A1 |
Attorney, Agent or Firm:
Muneo Kako