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    • 10. 发明专利
    • EXHAUST GAS RELIRCULATING DEVICE FOR INTERNAL COMBUSTION ENGINE
    • JPH03134257A
    • 1991-06-07
    • JP24765690
    • 1990-09-19
    • DAIMLER BENZ AG
    • FURANTSU BENDERU
    • F02B3/06F02M26/55F02M26/58F16K31/126F16K31/70
    • PURPOSE: To surely and easily close an exhaust gas recycling valve at a high diaphragm temperature by relating the force of a spring working on the diaphragm to temperature. CONSTITUTION: A partial flow of recycled exhaust gas flows through the exhaust gas recycling valve of a passage 1, and the flow cross section of the passage 1 can be varied by a valve rod 2. The valve rod 2 is fixedly coupled to a diaphragm 3, which is acted upon by opposite forces, i.e., the force of a spring 4 wound in the form of a coil and negative pressure 5 controlled in relation to the operation of an engine. In that case, the force of the spring 4 works in the direction to close the valve whereas the negative pressure works in the direction to open the valve. The spring 4 uses a storage material such that when a predetermined critical temperature is exceeded according to the material of the diaphragm 3, for example, the elongation of the spring wire wound and a resulting increase in spring force start. Since the elongation of the storage material does not start abruptly but over a specific temperature range when the temperature value is exceeded, the valve can be closed gradually.