A recirculation pipe and an engine system including the same are provided. A recirculation pipe of an EGR apparatus may include a pipe body, and a plurality of bellows tube assemblies formed in the pipe body and including a plurality of bellows tube. One bellows tube assembly among the plurality of bellows tube assemblies and another bellows tube assembly among the plurality of bellows tube assemblies have different shapes.

Methods and systems are provided for a coupling device. In one example, the coupling device may be formed of a composite material and positioned between an exhaust system and a vehicle chassis. The composite material may include aluminum particles dispersed in an elastomer matrix to reduce an overall thermal absorptivity of the composite material.

A system comprises a tube and a bender. The tube comprises a first cylindrical portion and a second cylindrical portion. An undulated portion is disposed between the first cylindrical portion and the second cylindrical portion. Alternatively, the tube can comprise a plurality of cylindrical portions and undulated portions. The bender comprises a plurality of L-shaped brackets and a plurality of U-shaped brackets, and further includes a driving rod subassembly.

A method for aligning different portions of a conduit includes adjustably holding a first portion of a conduit in a first position, adjustably holding a second portion of a conduit in a second position relative to the first position of the first portion of the conduit, and inserting a bellows installation tool between the first portion of the conduit and the second portion of the conduit.

The invention relates to a line element (100) having an inner element (IE), an outer element (AE) surrounding the inner element, and a sliding layer (131, 132) in the form of an anti-friction lacquer, which is arranged in the contact region on the inner element (1E) and/or on the outer element (AE).

A flexible conduit element with an end portion that is designed for attachment to a rigid conduit element. The flexible conduit includes a bellows member, an interlock member, an outer fixing member and a connection nozzle. An attachment portion of the connection nozzle extends beyond the outer fixing member and the interlock member and ends in a flared shape to form a gas-tight seal.

A method for aligning different portions of a conduit includes adjustably holding a first portion of a conduit in a first position, adjustably holding a second portion of a conduit in a second position relative to the first position of the first portion of the conduit, and inserting a bellows installation tool between the first portion of the conduit and the second portion of the conduit.

A method for aligning different portions of a conduit includes adjustably holding a first portion of a conduit in a first position, adjustably holding a second portion of a conduit in a second position relative to the first position of the first portion of the conduit, and inserting a bellows installation tool between the first portion of the conduit and the second portion of the conduit.

A flexible tube system having an end section formed from an inner rigid tube and an outer shell, and the end section is joined to a central flexible portion having an inner decoupler tube, and an outer shell bridge is joined to the outer shell and the flexible central portion to define an insulation space.

A multiple component hot gas flowing conduit has an elongated, convoluted bellows, an interlock liner, frequency dampers and elastic spacers engaging the dampers and biasing the dampers into respective bellows convolution with no contact of bellows and liner for all operating states of the conduit. Assembly pretension of the interlock liner preferably flattens out the elastic spacers permitting assembly of the liner into the bellows and upon relaxation of the liner, the spacers extend radially outwardly to engage and bias the dampers into the bellows. The bellows is convoluted throughout, or may have convoluted ends with an integral smooth-wall tube therebetween. Components are isolated from abrasion against one another.