An electric gas flow heater has a grid-like heating element through which exhaust gas can flow axially, and which forms an electrical resistance heating. The grid-like heating element includes radially successive layers of band-like material, wherein the layers, in an axial view of the heating element, are bent in an undulating manner and include valleys and peaks. The layers that are located between the radially outermost layer and the radially innermost layer are attached by their peaks and valleys to the respectively radially adjacent layer, so that flow-through openings are formed between the layers. The wavelengths of the layers are increasing radially outwards.

A heating device includes a PCB (10), at least one heating element (30, 31, 32), bus bars (60a, 60b, 60c) and a terminal pin (40) and a terminal plate (70). At least a portion of the PCB (10) extends out of a PCB housing (20). The terminal pin (40) is disposed in a connector housing (50) disposed at least partially outside the PCB housing (20). At least one of the connector housing (50) and the portion of the PCB (10) extending out of the PCB housing (20) includes at least one support element (52) to support the connector housing (50) in a pre-determined position with respect to the PCB (10).

The invention relates to an electronic interface housing (6) of an electrical heating device (1) for heating an airflow passing through, the electronic interface housing (6) being configured to house electronic components for controlling at least one heating element (4) fitted to the electrical heating device (1), including at least one printed circuit board (44), the electronic interface housing (6) comprising at least one rib (56, 58) in contact with the printed circuit board (44) in a contact zone (54), characterized in that the printed circuit board (44) comprises at least one water drainage opening (82) in the contact zone (54).

A retaining body for heating elements, in particular oval and round heating elements, having an outer part assembly and an inner part assembly which is arranged inside the outer part assembly and forms an elastic connection with the outer part assembly under mechanical tension, wherein the outer part assembly and/or the inner part assembly has/have a plurality of receptacles which are arranged distributed in the circumferential direction and in each of which a heating element is arranged, and the outer part assembly and the inner part assembly each comprise a polygon profile with polygon corners and polygon sides which connect the polygon corners. The invention is characterized in that the inner part assembly and the outer part assembly can be rotated relative to one another and are dimensioned in such a way that the polygon profiles are elastically deformed by a relative rotation between the inner part assembly and the outer part assembly in such a way that, in the mounted state, a press fit is formed in the region of the heating elements by the induced mechanical tension.

A heater element including a honeycomb structure and a functional material-containing layer, wherein the honeycomb structure has an outer peripheral wall and partition walls provided inside the outer peripheral wall, the partition walls partitioning a plurality of cells that form flow paths extending from an inlet end surface to an outlet end surface, and at least the partition walls are made of a material having PTC characteristics, and wherein the functional material-containing layer is provided on a surface of the partition walls, and a thickness of the functional material-containing layer increases from the inlet end surface toward the outlet end surface.

An electrical load resistance includes a housing having at least one U-shaped receiving pocket, in which at least one PTC heating element is accommodated. The PTC heating element includes at least one PTC element and at least one contact plate electrically conductively connected to the PTC element for energizing the PTC element. The contact plate has a terminal lug for plug contacting the PTC element, and the PTC heating element abuts at least on opposite main side surfaces of the receiving pocket in a heat-conducting manner and projects beyond the terminal lug of the receiving pocket. The housing of the electrical load resistance is closed, and thus has no inlet or outlet openings for a medium to be heated. Also provided is a device with an electrical load resistance for reducing the starting time of an internal combustion engine, a method for reducing the starting time of an internal combustion engine, and a use of a PTC heating device as an electrical load resistance for reducing the starting time of an internal combustion engine.

The invention, according to a first aspect, relates to a cover (4) of an electronic interface housing (300) of an electrical heating device for a motor vehicle, the cover (4) comprising at least one pressing member (44a, 44b) and at least one pressing element (45) which are configured to be in contact with a printed circuit board (5) when the cover (4) is fixed on the electronic interface housing (300), a free end of the at least one pressing member (44a, 44b) extending in a first transverse plane (451) and a free end (4501) of the at least one pressing element (45) extending in a second transverse plane (452), the at least one pressing member (44a, 44b) and the at least one pressing element (45) being arranged so that they project, in a direction perpendicular to a reference plane (400) of the cover (4), from an inner face of the cover (4) intended to face toward the inside of the electronic interface housing (300), characterized in that the first transverse plane (451) and the second transverse plane (452) are substantially parallel to one another and to the reference plane of the cover, strictly not coincident with one another or with the reference plane (400) of the cover (4), the second transverse plane (452) being, in a direction perpendicular thereto, closer to the reference plane (400) of the cover (4) than the first transverse plane (451).

This disclosure refers to a method for confectioning resistors that each comprise a PTC ceramic plate and metallic electrode layers covering opposite faces of the ceramic plate, said method comprising the following steps: measuring an electrical resistance of a resistor to be confectioned by applying an electrical potential to one of electrode layers such that an electric current flows from one of the electrode layers through the ceramic plate to the electrode layer on the opposite face of the ceramic plate, comparing the measured resistance to a target resistance, and removing, if the measured resistance is lower than the target resistance, a section of at least one of the electrode layers. This disclosure also refers to such a resistor and a heating device comprising such resistors.

The present invention relates to a PT heater and, more specifically, to a PTC heater which: mechanically fixes a heating element, a terminal, an insulating layer, and a heat-radiating unit, which constitute the PTC heater, by bending a fixing projection of a hook structure formed at a heat rod; and further has an auxiliary fixing protrusion capable of fixing the position of the heating element so as to increase the adhesiveness between the PTC element and the heat-radiating unit, thereby enabling performance to improve and facilitating assembly through the heat rod.

A heat-generating element for an electric heating device includes a heating element casing which comprises a casing element formed from a ceramic material and a casing mating element formed from a ceramic material. The two casing elements bear against each other in a sealing manner and enclose, in a sealing manner between each other, a PTC element and conductor tracks. The conductor tracks bear, in an electrically conductive manner, against the PTC element and are assigned different polarities for energizing the PTC element. The heating element casing carries contact strips connected in an electrically conductive manner to the associated conductor tracks. At least one of the conductor tracks is formed by an electrically conductive element which is provided with through holes and which, in a height direction of the conductor track, comprises discrete points of support that bear against the PTC element and one of casing element and casing mating element. The present invention further relates to an electric heating device with at least one heater casing with a heat-generating element of the type described here that is arranged in a circulation chamber with a heating element casing joining at least one PTC element and contact strips energizing the PTC element as a structural unit. The heat generating element has the contact strips electrically connected to the PTC element projecting over itself. A partition wall separates the circulation chamber from a connection chamber of the heater casing. The contact strips of the PTC heating element protrude through the partition wall and are exposed and electrically connected.