Patent ID: 8453438
Filing Date: 2013-06-04
Classification: F01L,F02D

Abstract:
1. An exhaust control device for a vehicle engine in which a combustion chamber faced by a top of a piston is slidably fitted into a cylinder bore included in a cylinder block and is connected to a crankshaft is defined between a cylinder block and a cylinder head joined to the cylinder block, comprising: an exhaust valve port facing the combustion chamber so as to be opened and closed by an exhaust valve and an exhaust port communicating with the exhaust valve port provided in the cylinder head; an exhaust pipe forming an exhaust passage along with the exhaust port is connected to the cylinder head via the exhaust port, said exhaust port including a bent portion with a bent-internal side partial passage sectional area; and a rotary valve capable of changing a cross-sectional opening area of the exhaust port is disposed at one side of the bent-internal side partial passage sectional area of the exhaust port where an exhaust flow rate is high; wherein a valve body of the rotary valve is disposed in a housing hole which is formed in the cylinder head and which cuts through the one side of the bent-internal side partial passage sectional area; wherein the valve body is formed as a single member having: wherein the rotary valve is only able to reduce the cross-sectional opening area of the exhaust port provided in the cylinder head from being completely opened to being partially opened, so that the cross-sectional opening area of the exhaust port cannot be completely closed by the rotary valve.