DE8519005U1 - Water pump impeller - Google Patents

Description

lilasserpump impeller

The invention relates to a üJasaerpumpenlaufrad for rine Cooling water pump in internal combustion engines consisting of a hub with a disc armed on it. ', «Il, where between the. ^ abe and the disc part a circular or parabolic transition area is provided that in the disc part including the? .i transition area a metallic reinforcement disk is arranged encapsulated on both sides, üjobei the reinforcement disk on on «? drive shaft Has slip-on hub part which is extrusion-coated on the outside and that deflecting blades on the disk part are arranged.

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Impellers of this type are known and are used in pumps that are used to transport the cooling water for cooling the engine in motor vehicles. Because of the special temperature loads for this purpose, a temperature range of about -i »D ^D C to + 130 ° C is covered the materials as well as the structural design are subject to special conditions. In the case of the well-known water pumps, the water pump impeller made of gray cast iron or brass is used. The disadvantage of these impellers made of ferrous or non-ferrous materials is that they tend to cavitation, ie to destroy the impeller blades, which leads to failure of the pump. Furthermore, there is the disadvantage that the surface becomes rough, which increases the flow resistance. Known Bind continues to be such üJaaserpumpeni

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where the impeller is made of plastic. For Motor vehicles is this version, however, because of the high noise and cold exposure not suitable, as the wheels flex so that they touch the housing wall

start, especially, ωεηη them at high temperatures are loaded, because the strength νση plastic falls

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The invention is based on the object of an Idssserpumpenlaufrad of the type mentioned at the outset in such a way that the high-noise and KBlt loads are managed.

This object is achieved according to the invention by the fact that the reinforcement washer and the hub part consists of a one-piece deformed sheet steel and is calibrated to near the outer rim of the wheel, the strengthening disc is provided with holes that are interspersed with plastic.

1 It is also suggested that the

j reinforcement washer a hub ring is pressed on.

The invention has the advantage that such a meitestgehend made of plastic LJasserpumpenlaufrad '■ can be used for the first time in the automotive field. ■ Due to the high abrasion resistance, there is no risk of material erosion due to cavitation. The plastic material provides a hydraulically smooth surface, so that

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Frictional losses are reduced.

The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawings.

Fig. 1

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Fig. 2 Fig. 3

a first embodiment Bform of a Bolchen over the pump impeller in the Cut,

a side view of Fig. 1 and

another embodiment of a such run-of-the-mill average.

The first embodiment of the impeller shown in FIGS. 1 and 2 consists of a hub 1 with which the impeller is plugged onto a drive shaft. To the hub 1 then closes a circular or parabolic transition area 2 which is perpendicular to the axis Disc part 7 to which deflection blades 3 are attached.

The core of the impeller is a metallic reinforcing disc k, which is coated with plastic on both sides in the transition area 2 and in the area of the disc part 7, while the plastic is applied on one side to the outside in the adjacent hub part 5, so that the impeller with its metallic inner surface on a drive shaft can be attached. For anchoring the plastic with the reinforcement washer k

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CLrärflöche this disk U distributed holes 6 attached. These layers 6 can cover up to 7D% of the surface. Furthermore, the hub part 5 of the reinforcement disk h extends over at least UQ% of the hub length. Furthermore, the disk part 7 is about 2 to U mm smaller than the diameter D corresponding to the sweeter circumference θ of the wheel. The side of the impeller facing away from the UmlEnkanhaufein 3 forms a surface with the hub 1.

Several designs are possible for the formation of the hub 1. In the embodiments shown in FIG form, a reinforcement sleeve 9 is additionally pressed over the hub part 5, which protects the hub area 5 against cold flow supports. There is also the possibility of providing the hub part 5 and the disk area from two parts to be connected to one another. The hub part 5 can continue consist of a thick material, for example a tubular steel cylinder of If mm thickness and in the disk part 7 of thin material, for example 0.75 mm. It can also be provided that the material of the hub part 5 and of the disk part 7 have different strength properties. The hub part 5 and the disk part 7 can also be connected to one another by welding, shrinking or pressing. It is also possible to design the hub part 5 in such a way that it extends over the entire Length L of the hub 1 extends.

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Claims (2)

Protection claims The pump impeller for a cooling water pump in internal combustion engines, consisting of a hub with a tiaran molded disc part, with a circular or parabolic transition area being provided between the hub and the disc part, with a metallic reinforcement disc being encapsulated on both sides in the disc part including the transition area, the WerstMrkungs disc being arranged has a hub part that can be skated onto a drive shaft, which is extrusion-coated on the outside and that at d; x \ pulley part UmlenkBchauf a are arranged, characterized in that the reinforcement disc (* ») and the hub part (5) consist of an integrally deformed sheet steel and extends to near the outer impeller edge (θ), the reinforcement disc i4) with bores ( 6) is provided, which are interspersed with plastic. 2) impeller according to claim 1, characterized in that a hub ring (9) is pressed on over the hub part (5) of the reinforcement disk (U). IIII 4 I * I Il Ii I I I 1 Ii Ii ti Il It II!