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
  • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
  • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
• • 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
• • 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
  • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
  • F04C2/086—Carter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
  • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

• Internal gear pump The invention relates to an internal gear pump having the features of the preamble of claim 1.
• the patent DE 196 13 833 B4 discloses an internal gear pump with an internally toothed ring gear and a pinion, which is arranged eccentrically in the ring gear and meshes with the ring gear in a circumferential section, so that the ring gear is also rotationally driven by a rotary drive of the pinion and the internal gear pump promotes hydraulic fluid in a manner known per se.
• the ring gear is rotatably mounted in a pump housing.
• the ring gear is an internally toothed gear and the pinion an externally toothed gear, which is referred to here as a pinion for language distinction from the ring gear.
• the ring gear and the pinion may also be referred to as gears of the internal gear pump. Outside the peripheral portion, in which the two gears of the internal gear pump mesh with each other, there is a crescent-shaped
• Gap between the ring gear and the pinion which is referred to here as the pump chamber.
• a separator is arranged, which is referred to as a sickle or sickle body due to its shape. Teeth of teeth of the ring gear are on the outside and tooth tips of teeth of the pinion inside of the separator, so that hydraulic fluid is trapped in tooth spaces of the gears and is promoted in a rotary drive of the gears of the internal gear pump from a suction to a pressure side.
• the separator divides the pump chamber into a suction area and into a pressure area, the suction area communicates with a pump inlet and the pressure area with a pump outlet. Disclosure of the invention
• the internal gear pump according to the invention with the features of claim 1 has a bearing ring which is rotatably disposed in a pump housing and in which the ring gear is rotatably mounted.
• the bearing ring allows a different material for the rotatable mounting of the ring gear as the material of the pump housing, such as a wear-resistant and / or low-friction material or, for example, the preparation of the pump housing of a cheaper material than that of the bearing ring.
• the bearing ring of the internal gear pump according to the invention has a pressurized pressure pocket in the region of the pressure region of the pump chamber, which is open to the inside of the ring gear.
• the pressure pocket is a cavity or a kind of depression, it does not have to be radially deep but can be flat.
• a resulting radial force by the pressurization from the inside is completely or at least partially compensated, possibly also overcompensated, so that the resulting, acting on the ring gear radial force is zero or at least small or at least reduced.
• the amount of compensation depends on the circumferential surface of the ring gear, which pressurizes the pressure pocket of the bearing ring, and the amount of pressurization in the pressure pocket in relation to the pressurization of the ring gear from the inside and the inside acted upon surface. Due to the pressure pocket in the bearing ring, the internal gear pump according to the invention has a complete or partial radial compensation of its ring gear.
• the invention is in itself intended for an internal gear pump having a separator in the pump room and which is often referred to as a sickle pump because of the usually crescent-shaped separator.
• the invention can also be used for so-called. Ring gear pumps, which have no separator in the pump chamber.
• Claim 2 provides that the pressure pocket communicates with the pressure region in the pump chamber and / or with the pump outlet, the pressure region communicating with the pump outlet, so that in both there is the same pressure, if one of a pressure loss by the flow of a hydraulic fluid through the internal gear pump apart.
• the embodiment of the invention has the advantage that the pressurization of the ring gear in the pressure pocket from the outside to the pressurization in the pressure range of the pump chamber adapts from the inside, whereby the radial compensation is largely independent of a changing pressure in the pressure region of the pump chamber and the pump outlet.
• An embodiment of the invention provides a bearing ring made of a plastic (claim 3), for example made of polytetrafluoroethylene (PTFE, claim 4).
• PTFE polytetrafluoroethylene
• Another advantage of plastic, and especially polytetrafluoroethylene, is an axial calibration of the bearing ring with a precise match to a width of the gears and, if present, a separator of the internal gear pump.
• a development of the invention provides a sealing lip at a circumferential end of the sealing pocket, which bears against the outside of the ring gear (claim 5).
• such sealing lips are provided at both circumferential ends of the sealing pocket.
• claim 6 provides that the sealing lip is acted upon on an outer side by the pressure prevailing in the pressure pocket. As a result, the sealing lip is pressed at higher pressure more strongly to the outside of the ring gear, whereby it seals as well at high pressures as at low pressures.
• Claim 7 provides for side open pouches.
• the pressure prevailing in the sealing pocket and acting on the seal presses the Gasket radially together, causing the seal to expand sideways.
• This means that the seal rests more strongly with increasing pressure on the end walls of the pump housing or the axial discs, so that the sealing effect is improved with increasing pressure. This achieves good sealing at low pressure as well as high pressure.
• Claim 8 provides that the seal of the sealing pocket is made of an elastomer, which appears due to its material properties as particularly suitable for the lateral sealing of the sealing pocket, especially at changing pressures.
• the internal gear pump according to the invention is provided as a hydraulic pump of a hydraulic vehicle brake system, for example as a so-called. Return pump a slip-controlled hydraulic vehicle brake system and / or for pressure generation of a hydraulic power-vehicle brake system.
• This is the subject of claim 9.
• brake fluid has worse lubricating properties than hydraulic fluid when using the internal gear pump according to the invention in hydraulic vehicle brake systems
• the rotary bearing of the ring gear in a separate bearing ring, rather than directly in a pump housing here is of particular advantage.
• the gears of the internal gear pump according to the invention have a width of about 2 to 3 mm - special requirements u.a. to the manufacturing accuracy, which can be solved better with the construction according to the invention than in a rotary bearing of the ring gear directly in a pump housing.
• the pump housing of the internal gear pump according to the invention may be a so-called hydraulic block or a region of such a hydraulic block of a hydraulic vehicle brake system (claim 8).
• Such hydraulic blocks are known from slip-controlled hydraulic vehicle brake systems.
• the internal gear pump or for each brake circuit such an internal gear pump, solenoid valves, hydraulic accumulator and other hydraulic components of the slip control installed and hydraulically interconnected.
• An electric motor as a pump motor for drive of the internal gear pumps is usually flanged to the hydraulic block.
• FIGURE shows a side view of an internal gear pump according to the invention.
• inventive internal gear pump 1 is provided as a hydraulic or so-called. Recirculation pump in a hydraulic, a slip control having vehicle brake system.
• the pinion 2 is arranged eccentrically in an internally toothed ring gear 4, which is rotatably received in a bearing ring 5.
• the ring gear 4 is rotationally driven with, so that the internal gear pump 1 in a conventional manner fluid, in the illustrated embodiment of the inventive internal gear pump 1 brake fluid , promotes.
• the pinion 2 and the ring gear 4 are also referred to as gears 2, 4 of the internal gear pump 1.
• the internal gear pump 1 Opposite the peripheral portion, in which the gears 2, 4 mesh with each other, the internal gear pump 1 has a crescent-shaped pump chamber 6 between the pinion 2 and the ring gear 4.
• One of the two holes forms a pump inlet 7, the other a pump outlet 8.
• the pump inlet 7 can also be considered as the suction side and the pump outlet 8 as the pressure side of the internal gear pump 1 become.
• a separator 9 is arranged in the pump chamber 6, which is often referred to as a sickle or sickle piece due to its shape.
• the separator 9 separates a suction and inlet side S of the pump chamber 6 from a pressure and outlet side P.
• An outer side of the separator 9 is located on tooth tips of teeth of the ring gear 4 and an inner side of the separator 9 abuts on tooth tips of teeth of the pinion 2.
• the separator 9 On the suction side S, the separator 9 is supported on a bolt which passes through the pump chamber 6 on the suction side S of the separator 9 parallel to the pump shaft 3 and forms an abutment 16 for the separator 9.
• the bearing ring 5 is rotatably disposed in a pump housing 10. It has a pinion 2, so an externally toothed gear wheel, which is rotatably mounted on a pump shaft 3. Housing covers are not drawn so that the inner parts of the internal gear pump 1 are visible. Laterally, the pump chamber 6 is bounded by axial plates 1 1, which rest on end faces of the gears 2, 4, the separator 9 and the bearing ring 5. The axial plates 1 1 are penetrated by the pump shaft 3 and the abutment 16 and are thereby held against rotation.
• the axial plates 1 1 are movable, they are applied on their the gears 2, 4 facing away from the outer side with a herrherr see in the pump outlet 8 see pressure and thereby pressed into sealing contact with the end faces of the gears 2, 4 and the separator 9.
• the axial plates 1 1 cover the pressure side P and the separator 9 and extend into a part of the suction side S, which is only partially covered by the axial plates 1 1.
• For the pump outlet, at least one of the two axial plates 1 1 1 has a hole congruent with the pump outlet 8.
• the pump inlet 7 is located outside of the axial plates 1 1.
• the bearing ring 5 In the region of the pressure side P of the pump chamber 6, the bearing ring 5 has a pressure pocket 12 which extends in the circumferential direction from a central region of the separator 9 to near the region in which the gears 2, 4 engage with each other.
• the pressure pocket 12 is an open on the inside of the bearing ring 5 recess. In the illustrated embodiment communicates the pressure pocket 12 in the bearing ring 5 by notches 13 in the gears 2, 4 facing inner sides of the axial plates 1 1 with the
• the notches 13 are T-shaped, their shank extends radially from the pressure side P outward to the pressure pocket 12, where a yoke of the notches 13 extends a distance in the circumferential direction.
• the shape of the notches 13 is not mandatory for the invention, it is essential that the pressure pocket 12 communicates with the pressure of the pressure side P or the pump outlet 8, which basically in addition also in other ways than with the notches 13 in the inner sides of the axial discs 1 1 can be accomplished.
• a pressure pocket 12 which compensates for the radial force, is desirable that the ring gear 4 is free of radial force, or a slight overcompensation, which presses the ring gear 4 with little force against the pressure pocket 12 opposite side of the bearing ring 5.
• the pressure pocket 12 is open.
• a seal to the axial plates 1 1 is made with a strip-shaped seal 14, which at a bottom, i. an outer side, the pressure pocket 12 is arranged.
• the seal 14 is acted upon by the pressure prevailing in the pressure pocket 12, ie with the outlet pressure of the internal gear pump 1.
• the pressurization presses the seal 14 radially together, causing it to expand sideways.
• the seal 14 is pressed to the side against the axial plates 1 1 with increasing outlet pressure more strongly, thereby sealing well even at high outlet pressure.
• the seal 14 is made of an elastomer, which appears due to its nature as well suited for the lateral sealing of the pressure pocket 12.
• the bearing ring 5 is made of a plastic, which allows the formation of sealing lips 15 at the circumferential ends of the pressure pocket 12 due to its elasticity.
• the sealing lips 15 abut the outside of the ring gear 4 and are acted upon on their outer sides by the pressure prevailing in the pressure pocket 12, that is to say by the outlet pressure of the internal gear pump 1.
• PTFE polytetrafluoroethylene
• the internal gear pump 1 is a hydraulic pump of a hydraulic vehicle brake system, not shown. It is provided as a so-called. Return pump for a slip control and / or pressure build-up in a hydraulic power vehicle brake system.
• the pump housing 10 is formed by a hydraulic block of the vehicle brake system, of which a fragment surrounding the internal gear pump is shown in the drawing. In the hydraulic block further hydraulic components such as solenoid valves, damper chambers, hydraulic accumulator and the like. Arranged and hydraulically interconnected. Such hydraulic blocks are known for slip-controlled hydraulic vehicle brake systems and will not be explained in detail here.

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• 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 (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=46640679

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Citations (1)

Family Cites Families (11)

• 2011
  • 2011-09-26 DE DE201110083425 patent/DE102011083425A1/de not_active Withdrawn
• 2012
  • 2012-08-07 CN CN201280046549.3A patent/CN103827494B/zh not_active Expired - Fee Related
  • 2012-08-07 WO PCT/EP2012/065382 patent/WO2013045152A2/de active Application Filing
  • 2012-08-07 JP JP2014531149A patent/JP5905106B2/ja active Active
  • 2012-08-07 EP EP12745683.8A patent/EP2761184A2/de not_active Withdrawn

Patent Citations (1)

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