An oceangoing vessel exhaust pipe coupling used to temporarily couple to an oceangoing vessel exhaust pipe. Installation and removal of the coupling only requires a simple mechanism with three translational degrees of freedom and one rotational degree of freedom, thereby enabling remote coupling. The coupling adapts to a wide array of exhaust pipe shapes and sizes. This is accomplished by a unique shape that allows stable and balanced resting position on top of an exhaust pipe as well as a two-chamber configuration, wherein the two chambers are separated by a permeable partition. Furthermore, the unique shapes of the chambers deflect the exhaust gas stream towards the outlet of the coupling, regardless of exhaust pipe style, thereby increasing capture efficiency and extending the life of an attached fabric flexible hose.

An exhaust structure for a saddle riding vehicle includes: an exhaust pipe connected to an internal combustion engine; and a catalyst disposed in the exhaust pipe; the exhaust pipe including a catalyst case unit housing the catalyst and upstream side exhaust pipes disposed on an upstream side of the catalyst case unit; the catalyst case unit having a larger diameter than the upstream side exhaust pipes; the upstream side exhaust pipes being connected to the catalyst case unit in a connecting portion located on an upstream side of the catalyst in a flow of exhaust; in the connecting portion, axes of the upstream side exhaust pipes and an axis of the catalyst case unit being in substantially right-angled positional relation to each other.

The present disclosure is directed to a flexible pipe assembly that includes a pipe, a sleeve, a first connection assembly, and a second connection assembly. The pipe of the flexible pipe assembly includes a first end portion that is coupled to an external vertical exhaust pipe that allows exhaust to escape from a truck and a second end portion that is coupled to a pipe to an outlet of an exhaust aftertreatment system (EAS). The pipe also includes a third portion, which is a bellows, coupling the first end portion to the second end portion of the pipe of the flexible pipe assembly. The first and second connection assemblies couple the sleeve to the pipe of the flexible pipe assembly by passing through holes in the sleeve and the pipe of the flexible pipe assembly.

Method and system are provided for a retractile exhaust tail pipe for vehicles. The system comprises an exhaust tube mounted to an underbody of a vehicle, an exhaust tip slidably mounted to the exhaust tube, the exhaust tip having a plurality of extension shafts fixed on a second end, and an exhaust tip retract module positioned on the exhaust tube circumscribing an outer surface, the exhaust tip retract module having an actuator, a gear, and a plurality of bearings that mate with the plurality of extension shafts on the exhaust tip. In one example, the system reduces a probability of vehicle tail pipes contacting a ground surface in an off-road condition.

Method and system are provided for a retractile exhaust tail pipe for vehicles. The system comprises an exhaust tube mounted to an underbody of a vehicle, an exhaust tip slidably mounted to the exhaust tube, the exhaust tip having a plurality of extension shafts fixed on a second end, and an exhaust tip retract module positioned on the exhaust tube circumscribing an outer surface, the exhaust tip retract module having an actuator, a gear, and a plurality of bearings that mate with the plurality of extension shafts on the exhaust tip. In one example, the system reduces a probability of vehicle tail pipes contacting a ground surface in an off-road condition.

A support component that supports a shielding member, and a fixing component that fixes the shielding member to the structure via the support component. The support component has a cylindrical part, two flange parts and spring part. The spring parts have a first spring and a second spring with different load-deflection characteristics. The first spring and the second spring are interposed between each of the two flange parts and both sides of the shielding member. As a result, the invention provides a sufficient buffering effect.

An exhaust gas system for an internal combustion engine includes at least one component which delimits an exhaust gas flow volume via an outer wall and, on an inner side of the outer wall which faces the exhaust gas flow volume, supports at least one shielding element. An intermediate space is formed between the outer wall and the shielding element. At least one connecting molding on the shielding element is directed toward the outer wall and is connected fixedly to the outer wall.

A multi-pass catalytic converter can divide a catalyst block into several catalytic volumes and enable the exhaust gas to flow through each volume in two or more passes consecutively. As the exhaust gas in an early pass can emit sensible thermal energy and chemical reaction energy to preheat the remaining catalytic volumes via conductive heat transfer, it can shorten the catalyst light-off time for the later passes and the whole catalyst block. By recouping the previously lost dissipating heat from the early catalytic volume, the present disclosure can significantly reduce the catalyst light-off time and emission concentration. Furthermore, one or more mixing chambers can be utilized to thoroughly mix the exhaust gas.

A method of operation of exhaust valves of an adjustable exhaust port 2-stroke motorcycle engine with a two stage exhaust valve system includes: providing a control rod mechanically coupled to a governor, so that the governor causes a rotation of the control rod. A first stage exhaust valve, a second stage left exhaust valve, and a second stage right exhaust valve are also controllably linked to the control rod; and operating the second stage left exhaust valve and the second stage right exhaust valve by opening at least one of the second stage left exhaust valve and the second stage right exhaust valve before the first stage exhaust valve is completely open in an overlap operation. Related methods and structures for overlap, and/or stagger, and/or limiter operation of exhaust valves of an adjustable exhaust port 2-stroke motorcycle engine are also described.

An internal structure of a primary exhaust duct of a turbomachine, the internal structure comprising a primary wall comprising a surface of revolution about a longitudinal axis, allowing the air to pass through orifices and forming an internal surface of the primary exhaust duct, an interior skin comprising a surface of revolution about the longitudinal axis, arranged inside the primary wall, an upstream flange and a downstream flange which attach the interior skin to the interior of the primary wall, at least one separator which is attached to the interior skin and which extends from the interior skin towards the primary wall, the, or each, separator extends in a plane generally parallel to the longitudinal axis, between the two flanges, and the, or each, separator is not attached to the primary wall.