Pierburg Gmbh

Pierburg Ag

Hans-Jurgen Husges

Heat transmission units are known wherein ribs for improving the cooling efficiency extend along the whole length of the flow path of the radiator. According to the invention, it is proposed, while keeping the constructional space at the same size, to provide a larger cooling surface in a first portion, which has a higher temperature gradient, and which is accomplished by a large number of ribs arranged therein, and to omit such ribs or to reduce their number in a region that has a lower temperature gradient, i.e. in a second portion. In this manner, the overall efficiency of such a heat transmission unit is improved.

Heat transmission unit for an internal combustion engine

An exhaust-gas cooling device for an internal combustion engine includes a housing with an exhaust-gas inlet, an exhaust-gas outlet, a valve device, and a U-shaped heat exchange unit including an outbound flow path and a return flow path. The housing comprises, on the open side of the U-shaped heat exchange unit, a first, a second and a third chamber. The first chamber provides a fluid connection from the exhaust-gas inlet to the second chamber, and the third chamber provides a fluid connection from the second chamber to the exhaust-gas outlet. The valve device is arranged in the second chamber such that the second chamber can be divided into two partial chambers, a first one of the partial chambers is arranged in fluid connection with the outbound flow path, and the second one of the partial chambers is arranged in fluid connection with the return flow path.

Exhaust-gas cooling device for an internal combustion engine

Flap bearing mountings of the present invention are for mounting flap devices (), such as switch-over, tumble, or swirl flap devices, on a housing () of an air intake port system () of a combustion engine. Mounting of flap devices () is accomplished by thermoforming projections () that are formed on bearing elements () of the flap device () and that extend through corresponding apertures () formed in the housing () of the air intake port system () of a combustion engine. This structure makes it possible to cost-effectively and precisely mount one-piece flap shafts () in all air intake port systems (), without having to use additional mounting elements. Through the exact, precise fixing of the mounted position, deformation of the shaft (), having flap bodies () arranged thereon, is reliably prevented and the service life of the entire flap device () is prolonged.

Flap bearing mounting

An air-intake tube system for internal combustion engines with straight or V-type cylinder configuration having individual intake ducts providing adjustable length of air flow between and air-inlet chamber and the individual cylinders. A maximum duct length is obtained when a shortcut aperture in the intake duct is closed, whereas by opening the shortcut aperture the shortest length of air flow takes place between the inlet chamber and the cylinder. The inlet chamber is closed off by a unit having upper and lower flanges which can be selectively mounted on and demounted from a skirt-like wall of the air-intake ducts. The unit is provided with a self-contained closure-valve mechanism for the shortcut ducts. The lower flange of the unit forms a clearance space therebelow between the intake ducts, in which are disposed further structural elements, containing components which are connected to the cylinder heads of the internal combustion engine and are accessible for maintenance by removing the unit.

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Willich, Germany

Hans-Jurgen Husges