Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/0404—Details or component parts
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/22—Arrangements for enabling ready assembly or disassembly

Definitions

• Radial piston pump with a prismatic body for a fuel injection system Radial piston pump with a prismatic body for a fuel injection system
• Radial piston pumps for fuel injection systems are known for example from DE 102 21 305 Al.
• the pump housing is very complicated shape.
• the low-pressure channels and the high-pressure channels and at least one bearing seat for the drive shaft are integrated into the pump housing. Therefore, the pump housing is very complicated in shape and very expensive and expensive to manufacture. Because of the complicated geometry, it can be produced economically only by casting.
• Each type of radial piston pump requires a separate mold and each type of pump housing must be machined and assembled after casting on a dedicated production line.
• the invention is based on the object to provide a radial piston pump, which is cheaper to manufacture and at the same time allows a great deal of flexibility in terms of the number of pump elements.
• This task is at a radial piston pump for high-pressure fuel supply at
• Fuel injection systems of internal combustion engines having at least one with respect to a stored in a pump housing drive shaft radially arranged pump element, wherein the one or more pump elements are actuated by the drive shaft and one suction side and one each Have high-pressure side, solved in that the pump housing is made of a prismatic body.
• a prismatic base body for example, has the shape of an annular cross-section, manufacturing technology very easy to implement and can be done fully automatically in a machining center.
• a further very advantageous embodiment of the basic body according to the invention provides that the outer contour of the main body has a cross section in the form of a regular polygon, in particular a triangle or a quadrangle.
• the outer contour of the base body has a cross section in the form of a regular polygon, in particular a triangle or a quadrangle.
• Pump elements or even more pump elements is identical.
• the essential difference between finished basic bodies of radial piston pumps according to the invention with one, two or more pump elements consists in the number of receiving bores in the main body, which must correspond to the number of pump elements.
• these variants can all be edited on the same machine tool without retrofitting. This results in considerable production engineering and economic advantages.
• a mounting flange is provided on a first end side of the base body.
• This mounting flange firstly serves to connect the main body or the pump housing to the internal combustion engine.
• the mounting flange can also have a bearing for the drive shaft.
• a bearing cap is provided on a second end face of the base body, which has a second bearing for the drive shaft.
• both bearings of the drive shaft are not arranged directly in the pump housing, but are arranged in the mounting flange or the bearing cap, the mounting of the bearing outside of the pump housing, which greatly simplifies the assembly.
• connecting means in particular a screw connection, are provided between the fastening flange and the bearing cover, which run outside the base body and parallel to a longitudinal axis of the base body and the fastening flange and the bearing cap Press in the axial direction against the body.
• the fastening flange and / or the bearing cap can be detachably connected, in particular by a screw connection or inseparably, in particular by welding, to the base body.
• the pump elements of the radial piston pump according to the invention comprise a piston, a cylinder and a cylinder head, wherein the piston oscillates in the cylinder and limits a delivery space.
• the cylinder and cylinder head of the pump elements are releasably connected, in particular by a screw connection or by welding, to the base body.
• the pump elements or the stationary parts of the pump elements are releasably connected, in particular by a screw connection or by welding, to the base body.
• the complexity of the pump housing according to the invention can be further reduced by providing low-pressure channels in the base body and / or the bearing cap, and by connecting the low-pressure channels with the suction side of the pump element (s). This makes it possible to produce the low-pressure channels outside of the pump housing, which usually brings a manufacturing simplification with it.
• the radial piston pump according to the invention it is also possible in the radial piston pump according to the invention to integrate in the bearing cap even more modules of the low-pressure region of the fuel injection system, such as a metering unit or a KÜV and other more. Because the bearing cap or the mounting flange is only subjected to the low pressure and is not exposed to the delivery pressure of the radial piston pump of over 2,000 bar, it is often sufficient to produce the mounting flange and / or the bearing cap made of aluminum or a high-strength plastic. As a result, manufacturing costs can be saved to a considerable extent and it can be used other and very economical production processes, such as plastic syringes. These manufacturing methods are not applicable to a conventional pump housing.
• the base body is produced by forming, in particular by hot rolling, cold rolling and / or extrusion. Forging is also an alternative. In any case, all forming processes have in common that the properties of the blank or semi-finished product produced in this way are very good by forming a structural improvement takes place. This also further increases the load capacity of the pump housing according to the invention.
• Figure 1 shows a partial longitudinal section through a first embodiment of a pump housing according to the invention without pump elements and without
• Figure 2 shows an embodiment of a radial piston pump according to the invention.
• FIG. 1 shows a partial longitudinal section through a pump housing according to the invention.
• the pump housing according to the invention essentially comprises a prismatic base body 1, which has a receiving bore 5.1.
• This receiving bore 5.1 is arranged radially and orthogonal to a longitudinal axis 3, as is apparent from the section along the line A-A in the right part of Figure 1.
• the receiving bore 5.1 serves to receive a pump element (not shown in FIG. 1).
• a flattening 7.1 is provided on the prismatic base body 1.
• This flattening 7.1 serves as a contact surface and / or sealing surface for the pump element, not shown.
• the flattening 7.1 can be made either already during the forming of the main body 1, for example by extrusion.
• a mounting flange 9 is provided at a first end face (without reference numeral) of the main body 1.
• the mounting flange 9 has a compatible with the inner diameter D 1 of the prismatic body 1 cylindrical projection 11.
• a bearing cap 17 is present, which likewise has a projection 11 and a bearing surface 13.
• the bearing cap 17 is closed in contrast to the mounting flange 9, and thus seals an interior of the prismatic body 1 from liquid-tight.
• the radial piston pump according to the invention should have only one pump element, only the receiving bore 5.1 and the flattening 7.1 is machined out of the blank of the base body 1.
• the radial piston pump is to have two pump elements, 180 ° to the receiving bore 5.1 and the flattening 7.1 offset a second receiving bore 5.2 and a second flattening 7.2 from the prismatic body 1 worked out.
• the radial piston pump according to the invention is used for high pressure supply of a very powerful engine, it may also be necessary to provide three pump elements. In this case, a total of three receiving bores 5.1, 5.3 and 5.4 and three flats 7.1, 7.3 and 7.4 worked out of the blank of the base body 1. In this case, it is recommended to arrange the three mounting holes 5.1, 5.3 and 5.4 as well as the flats 7.1, 7.3 and 7.4 offset by 120 ° to each other.
• the optional additional receiving bores 5.2, 5.3 and 5.4 are indicated by broken lines in section A-A. It should be emphasized that the main body 1 is made of the same blank regardless of the number of pump elements.
• FIG. 2 shows an embodiment of a radial piston pump according to the invention with two pump elements 29, which are arranged offset 180 ° to each other, shown in section.
• a drive shaft 23 is provided in the interior of the main body 1.
• the drive shaft 23 is rotatably mounted on the bearings 13 of the mounting flange 9 and the bearing cap 17.
• the illustrated in Figure 2 embodiment of a drive shaft 23 has an eccentric portion 25 on which a polygon ring, as is known from the prior art, is rotatably mounted.
• the invention is not limited to this type, but can be equipped with all types of eccentric shafts or camshafts.
• a pump element 29 comprising inter alia a piston 31, a cylinder 33 and a cylinder head 35, is used.
• the cylinder head 35 and the cylinder 33 are integrally formed.
• a high-pressure passage 43 extends from the delivery chamber 41 perpendicular to the plane of the drawing and provides the hydraulic connection between a pressure-side check valve (not shown) and the common rail (also not shown) of the fuel injection system.
• suction side of the pump elements 29 is shown.
• This suction side includes a check valve 45, low pressure channels 47.1, 47.2 and 47.3 and an annular groove 49th
• the annular groove 49 is arranged on the outer diameter of the projection 11 of the bearing cap 17 and is supplied via a fuel supply, not shown, by a prefeed pump with fuel from a fuel tank.
• the check valve 45 is fastened by a cover 51 in the cylinder head 35.
• the pump housing according to the invention which comprises a prismatic main body 1 and is supplemented by a mounting flange 9 and a bearing cap 17, firstly has a very simple structure, since the main body 1 has a prismatic shape. This makes it possible to produce this basic body 1 by forming or turning from the solid. At the same time, a large number of high-performance materials are available.
• the same prismatic body can be used for both radial piston pumps with one or more pumping elements.
• the bearings of the mounting flange 9, the drive shaft 23, the polygon ring 27, the bearing cap 17 are independent of the number of pump elements used 29.
• the base body 1 is adapted to the desired number of pump elements 29, that correspondingly many receiving holes 5 and 7 flats radially Distributed distributed over the circumference in the base body 1. This also makes it possible to produce radial piston pumps with different flow rates on a production line, so that they can be utilized very evenly and all radial piston pumps can use the same manufacturing technology.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Details Of Reciprocating Pumps (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=40514402

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (6)

• 2007
  • 2007-11-06 DE DE102007052748A patent/DE102007052748A1/de not_active Withdrawn
• 2008
  • 2008-09-19 DE DE502008002914T patent/DE502008002914D1/de active Active
  • 2008-09-19 WO PCT/EP2008/062518 patent/WO2009059835A2/fr not_active Ceased
  • 2008-09-19 AT AT08804452T patent/ATE502210T1/de active
  • 2008-09-19 EP EP08804452A patent/EP2207958B1/fr not_active Not-in-force

Non-Patent Citations (1)

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