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Vane-cell pump provided with a deep-drawn metal-sheet potRelated Patent Categories: Pumps, With Condition Responsive Pumped Fluid ControlVane-cell pump provided with a deep-drawn metal-sheet pot description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070148011, Vane-cell pump provided with a deep-drawn metal-sheet pot. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a pump, e.g., for conveying lubricating oil to an internal combustion engine, in particular a multi-stroke vane-cell pump in which a rotatable group includes a rotor having vanes that are movable at least in a radial direction, a stroke profile along which the vane heads slide tightly and two axial lateral lids in the form of lateral plates or casing walls. [0002] Such pumps are known. Their lateral plates have axial inlet openings and outlet openings which must be separated by sealing devices or the like according to their pressure areas, for example, and therefore result in a great overall axial length in such vane-cell pumps. The components of the known rotatable groups such as lateral plates made of sintered steel and contour profile rings of solid steel or sintered steel are also accordingly designed with thick walls and thus require a great radial space as well as a great axial space. [0003] The object of the present invention is thus to provide a pump which does not have these disadvantages. [0004] This object is achieved by a pump, e.g., for conveying lubricating oil to an internal combustion engine, in particular a multi-stroke vane-cell pump in which the rotatable group has a rotor having vanes that are movable at least in a radial direction, a stroke profile along which the vane heads slide tightly and two axial lateral lids such as lateral plates or casing walls, the stroke profile and a first axial lateral plate being formed by a sheet metal pot. The sheet metal pot is preferably manufacturable by deep drawing. In addition, a pump in which a second axial lateral plate is formed by a sheet metal lid is also preferred. A pump according to the present invention is characterized in that the sheet metal lid has an embossed shoulder having an outside profile in the shape of the stroke profile. This has the advantage that after insertion into the sheet metal pot, the sheet metal lid covers the rounded edges of the sheet metal pot formed by the deep-drawing operation and thus creates a narrow sealing gap within the rotatable group. According to the present invention, the sheet metal lid may be manufactured by precision blanking or fine-edge blanking. [0005] A pump according to the present invention is characterized in that the intake openings are formed by radial openings in the sheet metal pot. This has the advantage that the rotatable group has a narrow design because the suction channel may be situated around the sheet metal pot radially and need not be situated axially on the opposite side of the pressure channel. [0006] A pump in which the outlet openings are formed by axial openings (pressure pockets) and optionally the at least one radial opening in the sheet metal pot is preferred. According to the present invention, the radial outlet opening is closable by a temperature switching valve or a pressure switching valve and thus establishes a switchable delivery area. This has the advantage that the pump delivers pressurized oil to both delivery areas as a function of the temperature-dependent or pressure-dependent lubricating oil demand for the internal combustion engine, or it conveys pressurized oil to only one delivery area, the second delivery area also going along without a pressure buildup, possibly resulting in a substantial power-saving effect. [0007] A pump according to the present invention is characterized in that the temperature switching valve has an excess stroke spring. This has the advantage that after the radial outlet opening is sealed by the temperature switching valve and if there is no further expansion of a thermal expansion element due to an increase in temperature of the lubricating oil, the expansion element is able to execute an additional expansion movement against the excess stroke spring without any deformation or destruction. [0008] In a preferred pump, the sheet metal pot of the rotatable group and possibly the temperature switching valve or pressure switching valve are integrated into a plastic casing. The plastic casing is preferably finished by injection molding and therefore does not require any reworking. The advantage here is that a rotatable group encapsulated in sheet metal is integrated into a plastic casing, making it possible to utilize the advantages of the two types of materials. [0009] Another pump according to the present invention is characterized in that the axial outlet opening of the switchable conveyor area is closable by a reed nonreturn valve. The reed nonreturn valve has the same shape as the stroke profile curvature. The reed nonreturn valve is also mounted on a journal made of plastic in the plastic casing. The reed nonreturn valve is also protected from overstrain by a stroke stop in the plastic casing. This design of the reed nonreturn valve has the advantage of being very inexpensive while also being integrated into the pump in a neutral manner in terms of space. [0010] A pump according to the present invention is characterized in that the sheet metal not has a notched or impressed cold start ring, which guides the vanes outward according to the stroke profile beneath the vanes in a cold operating state and steers against the stroke profile. In addition, a pump in which the rotor has grooves or indentations to receive the cold start ring is also preferred. In another preferred pump, the sheet metal lid has a notched or impressed cold start ring. [0011] A pump according to the present invention is characterized in that the sheet metal lid has apparent pressure pockets impressed in it, i.e., pressure pockets without through-openings which produce only an axial pressure surface compensation for the rotor in the pressure area. [0012] In another preferred pump, the radial outlet opening(s) of the switchable delivery area open(s) into a channel opening directly by a short path into the intake area of the second nonswitchable delivery area. This has the advantage that low flow losses and a favorable channel guidance result in a low-energy pressureless circulation in the switchable delivery area. [0013] The present invention will now be described in greater detail on the basis of the figures. [0014] FIG. 1 shows a view of the open pump. [0015] FIG. 2 shows section B-B from FIG. 1. [0016] FIG. 3 shows a cross section of the sheet metal pot and the rotor. [0017] FIG. 4 shows a detail of the sheet metal pot and the sheet metal lid. [0018] FIG. 5 shows a cross section of the rotatable group and the temperature switching valve. [0019] FIG. 6 shows a cross section of the temperature switching valve in the open state. [0020] FIG. 7 shows the pump casing having the nonreturn valve. [0021] FIG. 8 shows section D-D from FIG. 7. [0022] FIG. 9 shows section C-C from FIG. 7. [0023] FIG. 10 shows a cross section of an embodiment of the cold start ring. [0024] FIG. 11 shows a cross section of another embodiment of the cold start ring. Continue reading about Vane-cell pump provided with a deep-drawn metal-sheet pot... Full patent description for Vane-cell pump provided with a deep-drawn metal-sheet pot Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Vane-cell pump provided with a deep-drawn metal-sheet pot 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. Start now! - Receive info on patent apps like Vane-cell pump provided with a deep-drawn metal-sheet pot or other areas of interest. ### Previous Patent Application: Peristaltic pump Next Patent Application: Multi-functional rotating means of electric fan Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Vane-cell pump provided with a deep-drawn metal-sheet pot patent info. 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