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
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
  • F04C15/0023—Axial sealings for working fluid
  • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
• • 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
  • F04C2230/00—Manufacture
  • F04C2230/90—Improving properties of machine parts
  • F04C2230/91—Coating
• • 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
  • F04C2270/00—Control; Monitoring or safety arrangements
  • F04C2270/12—Vibration

Definitions

• the invention relates to a gear pump, in particular for a power steering, with a housing in which a pump chamber is formed, and a pump chamber defining the pump cover.
• Such pumps are used as standard as part of a motor-pump set in the power steering systems of motor vehicles.
• gear pumps tend to cause noise due to pulsed fluid delivery.
• noise due to the desire for simple and cost-effective production of the pump, therefore, there is also a demand for a reduction of noise.
• the object of the invention is to provide a pump which is easy to manufacture and has a good noise attenuation.
• the pump cover is provided with a sound-absorbing coating.
• a coating has proven to be very effective to reduce the sound transmission out of the pump housing. Manufacturing technology, a coating is applied quickly and easily. Since separate sound-absorbing elements can be omitted and the sound absorption in the pump cover can be integrated, reduces the number of components required and thus the number of manufacturing steps, which makes the pump more cost-effective.
• the coating may be a suitable elastomer in a suitable thickness.
• the pump cover consists of a coated steel sheet. The combination of a steel sheet and a coating shows good sound decoupling properties.
• the outside coating in addition to its sound-absorbing properties, can serve as a seal between the pump and a motor housing connected to the pump at the pump cover.
• the inside coating may act as a seal, e.g. as a sole or additional seal of a bearing glasses, in which the shaft ends of the gears gear pump are mounted.
• the pump cover has a first attachment structure configured to engage a corresponding second attachment structure on the housing.
• the pump cover is fixed to the housing via fasteners inserted through aligned openings. This step is time consuming and therefore unfavorable.
• the fastening can be produced simply by engaging the fastening structures with one another, whereby additional fastening means can be dispensed with.
• the first attachment structure allows a latching connection with the second attachment structure, so that by simply attaching the pump cover to the housing, the fixation of the pump cover on the housing can be achieved without additional tools.
• the first attachment structure may be e.g. have two fastening tabs. These latch e.g. around protrusions of the second attachment structure.
• the first attachment structure is integrally formed with the pump cover to minimize the number of components required.
• the second attachment structure can be formed integrally with the housing.
• a sealing groove is formed in the pump chamber side in a cover section of the housing, which makes it possible to simplify the shape of the bearing glasses to be used in this area.
• FIG. 1 is a schematic perspective partial sectional view of a gear pump according to the invention according to a first embodiment
• FIG. 2 shows the pump in FIG. 1 in an exploded view
• FIG. 3 is a schematic perspective sectional view of a gear pump according to the invention according to a second embodiment
• FIG. 4 is a partial exploded view of the pump in FIG. 3;
• FIG. 5 is a schematic perspective sectional view of a gear pump according to the invention according to a third embodiment.
• FIG. 6 is an exploded view of the pump in FIG. 5.
• FIG. 1 shows a gear pump 10 for a power steering system of a vehicle.
• a pump chamber 18 is formed in a housing 12, which here consists of a cover portion 14 and a pump chamber section 16 connected thereto.
• the lid portion 14 and the pump chamber portion 16 are formed in this example by two separate components.
• two meshing gears 20 are arranged in the pump chamber 18.
• Their shaft ends 22 are accommodated in two bearing eyeglasses 24, one of the bearing eyeglasses 24 supporting the two upper shaft ends and the second bearing eyeglasses 24 supporting the two lower shaft ends 22.
• annular seals 26 are arranged, each lying in its own sealing groove 28 in the lid portion 14.
• the outer of the seals 26 seals off the transition from the cover section 14 to the pump chamber section 16, while the inner of the two seals 26 produces a seal between the upper bearing bracket 24 and the cover section 14.
• Pump chamber 18 bounded by a pump cover 30.
• This is a substantially flat plate having only the essential for the function of the gear pump 10 openings, which will be described in more detail below.
• the pump cover 30 consists of a steel sheet which is completely coated on the side facing the pumping chamber 18, here an elastomer, e.g. Rubber.
• the coating 32 has a sound-damping effect.
• the pump cover 30 forms a sound-damping element that receives the vibrations generated by the pulsed conveying movement of the gear pump and thus decouples the gear pump 10 with respect to sound from the environment.
• the coating 32 is chosen in thickness and property so that it also assumes a sealing function in the example shown and the pump cover 30 seals against the pump chamber section 16 and the lower bearing glasses 24 so that they usually arranged in this area
• the pump chamber section 16 facing away from the side of the pump cover 30 is also provided with an elastomer coating. This causes a seal of the gear pump 10 against a (not shown) there scheduled engine block.
• an opening 33 is formed, through which protrudes one of the shaft ends 22, so that the associated gear 20 can be driven by a (not shown) arranged in the engine block motor.
• an inlet port 34 is formed in the pump cover 30, which is in flow communication with the pump chamber 18 and passes through the hydraulic fluid into the pump chamber 18.
• an outlet opening 36 is provided, which is on the high pressure side of the gear pump 10 in flow communication with the pump chamber 18 and through which the pumped hydraulic fluid leaves the gear pump 10.
• Positioning pins 38 are formed, which are aligned in the assembled state with corresponding recesses 40 in the lid portion 14 and in the pump cover 30.
• the cover section 14, the pump chamber section 16 and the pump cover 30 are held together by fastening means 42, here screws, which protrude through corresponding aligned passage openings 44 in the cover section 14, in the pump chamber section 16 and in the pump cover 30.
• FIGS. 3 and 4 show a second embodiment of a gear pump 210.
• the unchanged components compared to the first embodiment retain their already introduced reference numerals.
• the lid portion 14 and the pump chamber portion 216 are integrally connected to a housing 212 of a gear pump 210.
• the bearing goggles 24 each have, in this example, a sealing groove 228 which serves to receive a W-shaped seal 226.
• the pump cover 230 is formed of an elastomer-coated steel sheet as in the first embodiment.
• the sound deadening coating 32 may be disposed on one or both sides of the pump cover 30.
• the pump cover 230 and the housing 212 are not about screws, but about intermeshing Attachment structures attached to each other.
• the pump cover 230 has a first attachment structure 250 that engages a corresponding second attachment structure 252 on the housing 212.
• the first fastening structure 250 has two tabs 254 which are opposite the circumference of the pump cover 230 and project approximately at right angles from the pump cover 230.
• the tabs 254 are here formed integrally with the pump cover 230.
• the corresponding second fastening structure 252 is designed in the form of two projections which are located opposite one another on the circumference of the pump chamber section 216 and which each have a contact surface 256 and a projection
• Bevel 258 have.
• the projections are here in one piece with the
• Outer wall of the pump chamber portion 216 is formed.
• the pump cover 30 can be pushed onto the housing 212 in the manner of a latching connection, wherein the run-on slope 258 first pushes the tabs 254 to the side until the tab opening has passed the run-on slope 258, whereupon the tabs 254 which are elastically formed in the radial direction snap back and engage behind the contact surface 256.
• first and second fastening structures 250, 252 could also be designed in a different manner ensuring a latching connection.
• Attach pump cover 30 by means of a snap or snap connection to the housing 212.
• the seals 226 are not formed in this example as ring seals, but in W-shape, with the open end opposite the inlet side of the pump chamber 18, which is connected to the inlet port 34 is located.
• the sealing groove 328 for the W-shaped seal 326 in the housing 312 is not formed in the bearing eyeglasses 324, but in the cover portion 314 of the housing 312.

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39595512

Family Applications (1)

Country Status (3)

Citations (4)

Family Cites Families (7)

• 2007
  • 2007-05-24 DE DE200710024190 patent/DE102007024190A1/de not_active Ceased
• 2008
  • 2008-04-23 WO PCT/EP2008/003271 patent/WO2008141714A1/de active Application Filing
  • 2008-04-23 CN CN2008800172405A patent/CN101688532B/zh active Active

Patent Citations (4)

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