Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
  • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
  • F01C21/10—Outer members for co-operation with rotary pistons; Casings
• • 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
  • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
  • F04C23/008—Hermetic 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
  • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
  • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
• • 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
  • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
  • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
  • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
  • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
  • F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
• • 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
  • F04C2240/50—Bearings

Definitions

• the invention relates to a vacuum pump for use in the automotive sector, with a rotatably mounted on a rotor rotor Rotorefement, which is arranged in a rotor housing, and with an indirectly or directly driving the rotor shaft electrical Aniriebsorgan which is arranged in a motor housing, wherein the rotor housing and the motor housing are connected to one another via a housing wall and form a housing arrangement, wherein the rotor shaft is mounted in the housing wall by means of a bearing device, and wherein the rotor housing has at least one inlet and one outlet.
• the vacuum required for this purpose is provided in conventional vehicles predominantly either by suction pipe connections to gasoline engines or mechanical vacuum pumps to diesel engines.
• electric vacuum pumps or electric vacuum pumps are used to ensure independent of the engine vacuum supply.
• the motor for electrically driving the vacuum pump and the rotor which generates the negative pressure in a housing assembly. If the space permits, the rotor housing in the longitudinal direction connects to the motor housing, which is the motor shaft provided with the rotor directly driven by the electric drive member.
• the motor housing and the rotor housing are connected to each other via a housing wall through which the motor shaft extends.
• the rotor axis is mounted in the housing by means of a bearing device. Due to the build-up of negative pressure in the rotor housing, the bearing device is exposed to an extremely high load, so that, for example, lubricants are sucked into the rotor space and a proper storage can no longer take place.
• a targeted leakage geometry is incorporated as a remedy, so that air is led from the outlet to the middle of the shaft in order to minimize the load on the bearing device due to a pressure difference in the motor and rotor housing. This approach is very important in the manufacture of the rotor housing and, in addition, the desired leakage reduces the efficiency of the vacuum pump.
• the object is to provide a vacuum pump for use in the automotive field, which avoids the above-mentioned disadvantages.
• This object is achieved by providing in the housing wall at least one passage opening which fluidly connects the rotor housing and the motor housing. In this simple and inexpensive manner, pressure equalization between the motor housing and the rotor housing is provided, which ensures safety and longevity for the life.
• the at least one passage opening is provided in the region of the storage device. The fact that the housing assembly is hermetically sealed, the volumetric efficiency of the vacuum pump is increased.
• the bearing device is suitable for a rolling bearing that is inexpensive to produce and easy to assemble, and because of the particular design of the housing wall with at least one passage opening, is no longer exposed to the high pressure difference that would lead to a grease loss of the rolling bearing.
• a start-up disk for the rotor member may be provided between the housing wall and a second cylinder wall piece.
• Figure 1 is a sectional view of a vacuum pump according to the invention.
• FIG. 2 shows a perspective view of a motor housing of the vacuum pump from FIG. 1.
• the housing arrangement 4 consists essentially of a motor housing 6 and a rotor housing 8.
• a per se known electric motor 10 is provided with a control electronics 12 shown schematically.
• the rotor shaft 14 is designed in several parts, or that a drive shaft of the motor 10 is connected via a coupling with a rotor shaft 14.
• the motor housing 6 has, at the end remote from the rotor housing 8, a cover element 16 on which the control unit 12 for the electronically commutated motor 10 is arranged and which has a first rolling bearing 18 for supporting the main shaft 14.
• the engine 10 may be implemented as a conventional mechanically commutated engine.
• a housing wall 20 is provided, which closes the motor housing 6 airtight together with the cover member 16 and a cylinder wall piece 22.
• the housing wall 20 has outwardly directed mounting flanges 24 for mounting the vacuum pump in the engine compartment.
• the housing wall 20 forms a part of the rotor housing 8, which adjoins the motor housing 6 in the longitudinal direction and is likewise hermetically sealed by this housing wall 20.
• the housing wall 20 is thus in the present embodiment, both a part of the motor housing 6 and a part of the rotor housing 8. Furthermore, the rotor housing 8, a second cover member 26 and a second cylinder wall piece 28, wherein between the housing wall 20 and the second cylinder wall piece 28th a thrust washer 21 made of stainless steel for a Rotor element 32 is arranged.
• the second cover element 26 is bolted to the housing wall 20 via through-bolts 30, which extend through the second cylinder wall piece 28.
• the rotor housing 8 is closed fluid-tight. Furthermore, the rotor housing 8 in a known manner to a Einiass and an outlet. which are not shown in this illustration.
• the rotor world 14 has the rotor element 32, which in the present case has a plurality of displaceably arranged wing elements and, accordingly, the vacuum pump is designed as a vane cell pump.
• the rotor element 32 interacts in a known manner with the second cylindrical housing part 28 and accordingly provides for the vacuum build-up.
• a second rolling bearing 34 is arranged, in which the rotor shaft 14 is likewise mounted and through which the rotor shaft 14 into the rotor housing 8 extends.
• the housing wall 20 has three passage openings 36, which are arranged directly in the region of the roller bearing 34. In this way, a fluidic connection between the rotor housing and the motor housing 6 is provided, so that in the area of the rolling bearing device 34 no harm to the rolling bearing 34 harmful pressure difference.
• FIG. 2 shows the motor housing 6 in a perspective view. Clearly visible is the housing wall 20 with the flange elements 24, via which the vacuum pump can be fastened in the engine compartment of the motor vehicle.
• the rotor shaft 14 is mounted in the rolling bearing 34 and extends through the housing 20 through into the rotor space of the rotor housing 8, not shown.
• the passage openings 36 which ensure the pressure equalization in the region of the rolling bearing 34.
• the invention is not limited to the embodiment of a multi-winged vane pump and is particularly applicable to, for example, a single vane vacuum pump.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Applications Or Details Of Rotary Compressors (AREA)
• Rotary Pumps (AREA)
• Compressor (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=44628252

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (4)

Citations (4)

Family Cites Families (10)

• 2011
  • 2011-07-08 JP JP2014519429A patent/JP6165139B2/ja active Active
  • 2011-07-08 CN CN201180072145.7A patent/CN103649464B/zh active Active
  • 2011-07-08 US US14/131,203 patent/US20140161647A1/en not_active Abandoned
  • 2011-07-08 EP EP11730666.2A patent/EP2729667B1/de active Active
  • 2011-07-08 WO PCT/EP2011/061628 patent/WO2013007278A1/de active Application Filing

Patent Citations (4)

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