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PumpRelated Patent Categories: Pumps, Motor Driven, Pump And Motor Interconnected By Endless Flexible Transmission ElementPump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070122294, Pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The invention relates to a pump, a tensioning element and an engine. [0002] An engine is typically equipped with a cooling system which comprises a coolant pump designed to convey coolant within the cooling system. The coolant pump is driven by a chain or belt of the engine for this purpose. [0003] The present invention provides a pump having the features of claim 1, a pump having the features of claim 9, a tensioning element having the features of claim 19 and an engine having the features of claim 21. [0004] The pump according to claim 1 of the present invention is designed for conveying coolant in an engine. Integrated in this pump is a tensioning element which is designed for tensioning a drive member of the engine. [0005] Thus, a pump is provided having an integrated function for conveying coolant in a cooling system of the engine or an internal combustion engine. The drive member which is looped around a number of shafts in the engine and is also designed to drive the pump may be tensioned by the tensioning element of the pump. The tensioning element can compensate changes in length which occur during the operation of the drive member. [0006] The tensioning element may be inserted in a pump housing of the pump. It is thus readily possible to equip a pump with the tensioning element as a later add-on. However, the tensioning element may also be constructed as an integral part of the pump, preferably of the pump housing. [0007] Incorporating the tensioning element in the pump may be carried out for example by means of a hydro-element. If the tensioning element has been inserted in the pump housing steps are taken to supply it with pressurised oil from a main oil channel of the engine. [0008] A shaft of the pump which is connected to a drive wheel, this drive wheel being rotated by the drive member, is mounted in a preferably hydrodynamic plain bearing. This plain bearing is lubricated through a first bore which is connected to the main oil channel. This first bore inside the pump housing connects the main oil channel of a cylinder crank case of the engine with a subsidiary oil channel of the pump. [0009] Depending on the coolant used the pump may be constructed as a coolant pump or as a water pump. The drive member is then constructed as a component of a primary control assembly of the engine. This drive member may take the form of a chain, belt, particularly a toothed belt, V-belt or flat belt. [0010] The pump preferably has a shaft mounted on the plain bearing. At one end of the shaft there is usually a drive wheel which cooperates with the drive member, so that the shaft is set in rotation by means of the drive wheel when the engine is running. [0011] A closed pump wheel may additionally be integrated in the pump with the integrated tensioning element. This closed pump wheel is preferably attached to another end of the shaft, rotates with the rotating shaft and thus provides a delivery of a volume flow of the coolant needed to cool the engine. [0012] The pump according to claim 9 of the invention is designed for conveying coolant in an engine. Integrated in this pump is a closed pump wheel. [0013] As the pump wheel is closed, an optimum gap situation is obtained within the pump. The closed pump wheel is easy to manufacture. [0014] The pump is preferably constructed as part of a cooling system of the engine. During operation of the cooling system with the pump, the coolant or a cooling liquid can flow axially over the rotating pump wheel. [0015] A washer may be provided on a rear side of the pump wheel. In addition, a face seal may press this washer against the pump wheel. Thanks to this washer, which may for example be constructed as a rotary washer, the pump wheel may be produced in its finished shape without the need for any further machining. [0016] Thanks to the preferred constructed of the pump wheel as a closed wheel the gap may be very easily and accurately formed by cylindrical machining in a cylinder crank case of the engine, thus obtaining a optimum gap situation in the pump. Owing to the fact that the washer on the back of the pump wheel is pressed against the pump wheel by the face seal, there is no need for a mechanical connection between the washer and the pump wheel. The use of the washer means that the closed pump wheel can easily be installed in the pump. [0017] According to a further feature the shaft is mounted radially on a preferably hydrodynamic plain bearing, this plain bearing being supplied with pressurised oil by a main oil channel from a cylinder crank case of the engine. Thus, an inexpensive mounting can be provided for the shaft of the pump. This arrangement improves the fit of the closed pump wheel into the pump housing. Usually, shafts are axially sealed in pumps of this kind, which may result in problematic axial play of the shaft. This is avoided in the present pump by a radial seal for sealing off the shaft radially. [0018] A drive wheel or a pump wheel of the pump can be driven by the drive member from the primary control assembly of the engine. The pump has a spiral geometry, for example, and is cast in a V-shaped space in a cylinder crank case of the engine. [0019] For manufacture or assembly the pump wheel and the drive wheel may be screwed onto the shaft by means of a thread counter to a direction of rotation of the shaft when the pump is operated, either clockwise or anticlockwise, as the case may be. [0020] According to a further feature an axial bearing of the shaft is provided by a flange on the plain bearing, arranged between the shaft and the drive wheel. In this case a relief bore simultaneously forms a lubricating pocket for this axial bearing on the pump wheel side. Moreover, the present pump may have a closure for a main oil bore. Furthermore, suitable distribution may be provided for a main oil current. [0021] The pump may also have a pump cover, this pump cover being designed to close off a pump chamber of the pump. [0022] According to one feature, the pump according to claim 9 additionally has a tensioning element integrated into it which is designed to tension the drive member of the motor. [0023] The present pump may thus have at least one component cooperating with the drive member of a control assembly of the engine. This minimum of one component is constructed either as the tensioning element provided for tensioning the drive member and/or as the pump wheel driven by the drive member. High integration of component functions can be achieved with the pump according to the invention. [0024] Regardless of which of these two above-mentioned components the pump comprises, it may have a leakage chamber which is separated from an oil chamber of the pump by a shaft seal. Continue reading about Pump... Full patent description for Pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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