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AssigneeNippondenso Co., Ltd.
InventorsMasakazu Tanaka, Hiroyuki Usami, Mamoru Mabuchi, Tatsuo Sakai, Kinji Hodaira
Estimating the term…
In an automotive engine exhaust pipe having a main flow passage and a bypass flow passage, the exhaust gas flows through the bypass flow passage having an heater-provided catalyst when an engine starts. After a main catalyst reaches a catalytic activation temperature, a switching valve switches the exhaust gas to flow through the main flow passage. The main shaft is divided into a driven shaft inserted into a bearing hole and a driving shaft inserted into another bearing hole, and therefore, a total length thereof in an axial direction is shorter than a length of the main shaft without having segments. Therefore, even though the driven shaft and the driving shaft are deformed into the arch shape, a deformation amount thereof is reduced so that inner peripheries of the bearing holes are not rubbed against the shafts. Since the driving shaft is smaller in diameter than the driven shaft, even though a cross section of the driving shaft is elliptically strained, the inner periphery of the bearing hole is not rubbed against the driving shaft. As a result, since a clearance between the driving shaft and the bearing hole can be narrowed, the exhaust gas from the clearance can be prevented from leaking.
An exhaust pipe opening and closing apparatus provided in an exhaust pipe of an automotive engine having a main flow passage and a bypass flow passage, driven by an external driving equipment provided on an outside of said exhaust pipe and selectively opening and closing said main flow passage and said bypass flow passage, said exhaust pipe opening and closing apparatus comprising:
An exhaust pipe opening and closing apparatus provided in an exhaust pipe of an automotive engine having a main flow passage and a bypass flow passage, driven by an external driving equipment provided on an outside of said exhaust pipe and selectively opening and closing said main flow passage and said bypass flow passage, said main flow passage having a main catalyst therein, said bypass flow passage having a heater-provided catalyst, said exhaust pipe opening and closing apparatus comprising:
An exhaust pipe opening and closing apparatus provided in an exhaust pipe of an automotive engine having a main flow passage and a bypass flow passage, driven by an external driving equipment provided on an outside of said exhaust pipe and selectively opening and closing said main flow passage and said bypass flow passage, said main flow passage having a catalyst therein, said bypass flow passage having an adsorber for adsorbing toxic gas components in the exhaust gas, said exhaust pipe opening and closing apparatus comprising:
Dependencies are inferred from the claim text.