Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
  • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
  • F04C15/0049—Equalization of pressure pulses
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/30—Casings or housings

Definitions

• the invention relates to a pump unit, in particular a
• Hydraulic pump unit for a power steering system, comprising a housing and a pump body accommodated therein, wherein the housing has a
• Sheath section has terminal end portions.
• Such a pump unit is known from DE 203 02 535 U1.
• the substantially cylindrical housing has an open end, which is closed by a lid. Between the lid and the housing, a sealing element is provided, which is inserted in a housing groove. At the other end, the housing merges into a housing section of the motor-pump unit, the component of which is the pump unit. Between this housing section and the pump body of the pump unit, a sealing element inserted in a housing groove is likewise arranged.
• US 4,525,126 shows an electro-hydraulic motor-pump unit with a gear pump and an electric motor. Again, the housing of the pump is closed at the end facing away from the electric motor by a cover. The end of the pump housing facing the electric motor merges integrally into side cheeks, against which the housing of the motor rests.
• the invention provides a simply constructed pump unit, which has a stable housing and can be installed as a preassembled unit in a motor-pump unit.
• the invention provides for this purpose a pump unit of the type mentioned above with a housing in which the first end portion is formed as a flange for coupling the pump unit to a housing portion of a motor-pump unit and the second end portion is integral with the shell portion and with this forms a bell-shaped housing part.
• the housing construction according to the invention has the advantage that due to the one-piece design of the housing cover and the jacket portion no ⁇
• the bell-shaped housing part can be manufactured as a low-cost die-cast without sealing grooves.
• the bell-shaped housing part is also more robust than a conventional housing construction with a separate cover, in which the strong axial forces acting on the lid, can lead to a bending of the lid.
• the bell-shaped housing part and the flange are clamped by screws against each other, which preferably extend in the axial direction completely through the shell portion of the housing.
• Such a connection ensures on the one hand for a correct positioning of the bell-shaped housing part relative to the flange and on the other for a favorable force distribution, so that the bell-shaped housing part and the flange remain fluid-tight pressed against each other even under heavy load and do not deform.
• Most favorable is a fastening in which the heads of the screws rest on the side facing away from the flange of the bell-shaped housing part.
• the pump unit is designed so that the bell-shaped housing part defines an annularly closed resonator.
• At least one seal is arranged between the bell-shaped housing part and the flange.
• the gasket replaces a conventional elastomeric sealing element that would require a groove in the bell-shaped housing part or in the flange.
• seals are produced.
• the seal provides for a vibration isolation of the pump unit from the housing portion of the
• suction connection and pressure connection of the pump unit can be provided in the same or in different end sections of the housing.
• a construction in which both a suction port and a pressure port are formed in the flange is advantageous.
• the bell-shaped housing part, in particular its end-side end portion have a particularly simple shape.
• Such an end section is also more stable than an end portion with a breakthrough for a suction or pressure port.
• FIG. 1 is a side perspective view of a pump unit according to the invention with partially cut housing and pump body;
• FIG. 2 is an exploded perspective view of the pump unit according to the invention.
• FIG. 3 is a perspective bottom view of the invention
• FIG. 4 is an exploded perspective view of a motor-pump unit with a pump unit according to the invention.
• the hydraulic pump unit 10 shown in Figures 1 and 2 comprises a housing 12 and a pump body 14, both of which are shown partially in section and transparent in Figure 1, respectively, to make the components therein visible.
• the housing 12 is composed of a substantially cylindrical shell portion 16 and two end-side, adjoining the shell portion 16 end portions 18, 20 together.
• the first end portion is a flange 18 for mounting the pump unit 10 to a motor or intermediate housing of a motor-pump assembly.
• the second end portion 20 in the form of an end wall is formed integrally with the shell portion 16 and forms with this a bell-shaped housing part 22 which extends in the axial direction substantially over the entire height of the pump body 14.
• the bell-shaped housing part 22 which can be produced in a die-casting process, and the flange 18 are clamped by screws 24 against each other.
• the screws 24 extend in the axial direction through the entire shell portion 16 of the housing 12, wherein the heads of the screws 24 rest on the side facing away from the flange 18 of the bell-shaped housing part 22.
• the housing 12 of the multipart pump body 14 which comprises at least a central part 13 and a cover 40.
• a gear set with two meshing gears 26, 28 is arranged in the middle part 13.
• the gears 26, 28 are each made in one piece with a shaft 30 and 32 (see Figure 3).
• the shafts 30, 32 are mounted in two opposite bearing glasses 34, 36, wherein one of the shafts, the drive shaft 30, extends through an opening in the flange 18 of the housing 12 out.
• both a suction port and a pressure port are formed in the flange 18.
• the clearance between the pump body 14 and the shell portion 16 of the housing 12 serves as a resonator chamber for damping preferably the pressure-side pulsations of the hydraulic fluid.
• the Ressonatorraum is filled with hydraulic fluid annulus which extends completely around the pump body 14 around and is connected to a Druckfluidauslenfin the pump body 14.
• 18 positioning pins may be provided on the pump body 14 and the bell-shaped housing part 22 or - alternatively - on the flange, which engage in corresponding recesses of the respective opposing component ,
• the spring element 38 is corrugated and received in a matching recess 42 of the lid 40 to prevent lateral slippage.
• the spring element 38 presses the pump body 14 against the flange 18 and thus ensures an axial tension of the pump body 14 in the housing 12.
• elastomeric sealing elements 44 are provided between the bell-shaped housing part 22 and the flange 18, which are inserted into corresponding grooves 46 in the flange 18 or in the bell-shaped housing part 16.
• the sealing elements 44 which are integrally formed in the illustrated embodiment, provide a seal of the Resonatorraums, the pump body 14 and the lower bearing glasses 34 against the flange 18.
• the seal between the pump body 14 and flange 18 can be simplified if an overflow is provided between the interior of the pump body 14 and the resonator chamber.
• the seals may also be in the form of at least one
• the flat gasket is preferably a plane coated with a suitable sealing material metal plate which is clamped between the bell-shaped housing part 22 and the flange 18 and
• Suction connection and possibly the pressure connection of the flange 18 correspond.
• the flange 18 facing faces of the bell-shaped housing part 22 and the pump body 14 and the opposite faces of these surfaces of the flange 18 are completely flat.
• FIG. 4 shows a complete electro-hydraulic motor-pump unit 48 which can be used in power steering systems for motor vehicles.
• the motor-pump unit 48 comprises, in addition to the pump unit 10 according to the invention, a motor unit 50 with an electric motor.
• the flange 18 constitutes the connecting link between the pump unit 10 and the motor unit 50.
• the drive of the pump unit 10 takes place via the motor shaft of the electric motor, which is coupled to the drive shaft 30 of the pump unit 10.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38024392

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Citations (5)

Family Cites Families (3)

• 2006
  • 2006-02-21 DE DE102006008029.7A patent/DE102006008029B4/de not_active Expired - Fee Related
• 2007
  • 2007-02-14 CN CNA2007800141559A patent/CN101427028A/zh active Pending
  • 2007-02-14 WO PCT/EP2007/001281 patent/WO2007096080A1/de active Application Filing

Patent Citations (5)

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