US20140255236A1 - Internal gear pump - Google Patents
Internal gear pump Download PDFInfo
- Publication number
- US20140255236A1 US20140255236A1 US14/202,027 US201414202027A US2014255236A1 US 20140255236 A1 US20140255236 A1 US 20140255236A1 US 201414202027 A US201414202027 A US 201414202027A US 2014255236 A1 US2014255236 A1 US 2014255236A1
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- US
- United States
- Prior art keywords
- pinion
- bearing
- internal gear
- gear pump
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- 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
- F04C2/101—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 with a crescent-shaped filler element, located between the inner and outer intermeshing members
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- 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
- F01C21/02—Arrangements of bearings
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- 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
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
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- 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
- F04C2/084—Toothed wheels
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- 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
- F04C2240/56—Bearing bushings or details thereof
Definitions
- the description relates to an internal gear pump for a hydraulic vehicle brake system having the features described below.
- Internal gear pumps of this kind are used instead of conventionally used piston pumps in slip-controlled and/or power-operated vehicle brake systems and are often referred to, though not necessarily correctly, as return pumps.
- Internal gear pumps are known. They have an annulus and a pinion, which is arranged eccentrically in the annulus and meshes over a segment of the circumference with the annulus.
- the annuluses are internally toothed gear wheels, the pinions are externally toothed gearwheels, and the annulus and the pinion can also be regarded as gearwheels of the internal gear pumps.
- the terms “pinion” and “annulus” are used to distinguish between them. Opposite the segment of the circumference over which the gearwheels mesh there is a crescent-shaped free space between the annulus and the pinion, which is here referred to as a pump space.
- a dividing element Arranged in the pump space is a dividing element, on the outside and inside of which tooth tips of the two gearwheels rest and which divides the pump space into a suction space and a pressure space.
- the dividing element is often also referred to as a crescent or a crescent element.
- Another name for the dividing element is “filler piece”.
- the gearwheels When driven in rotation, the gearwheels pump fluid from the suction space into the pressure space.
- the prior art also includes internal gear pumps without a dividing element, and these can be referred to as gear ring pumps for the sake of distinguishing them.
- German Offenlegungsschrift DE 43 22 239 A1 discloses an internal gear pump, the pinion of which is arranged rigidly on a pump shaft, which is provided for the purpose of driving the pinion in rotation and, via the pinion, the annulus that meshes with the pinion.
- the pump shaft On both sides of the pinion, the pump shaft is rotatably mounted in sliding bearings, which are press-fitted into a pump housing.
- the internal gear pump having the features described below, has an annulus, a pinion meshing with the annulus, and a pump shaft for driving the pinion and the annulus in rotation.
- a bearing is arranged within the pinion to provide rotatable mounting of the pump shaft, i.e. the bearing is situated in one plane with the pinion and not to the side of the pinion, for instance.
- the bearing can be longer in the axial direction than the width of the pinion and can project from the pinion on one or both sides.
- the bearing passes through a central hole in the pinion, in particular the pinion is mounted rotatably in the bearing and/or the pump shaft is mounted rotatably on the bearing, which is embodied as a bearing bush, for example.
- Arranging the bearing within the pinion shortens an overall length of the internal gear pump.
- a further advantage is radial support for the pinion by the bearing in the plane of the pinion in which an inward-directed force acts on the pinion during the operation of the internal gear pump, said force being exerted on the pinion by fluid from the outside, which is pumped by the internal gear pump and is under pressure in the pressure space between the pinion and the annulus.
- the radial force acting on the pinion is supported without a moment about an axis transverse to the pump shaft by the bearing arranged within the pinion.
- This has the additional advantage that the pump shaft is not subjected to bending stress by the radial force acting on the pinion, and this improves pump running and reduces bearing wear.
- the pump shaft is not subjected to bending stress, there is no angular and radial misalignment of a driving wheel, generally a gearwheel, which is fitted for conjoint rotation on the pump shaft to drive the pump shaft in rotation. This improves truth of running of the internal gear pump and reduces wear, friction and noise generation at the driving wheel.
- the disclosure improves accuracy of position and truth of running of the pump shaft. The disclosure allows larger production tolerances.
- At least one embodiment of the disclosure includes a bearing which is integral with a housing of the internal gear pump, thereby eliminating a separate bearing and the assembly thereof.
- At least one embodiment of the disclosure relates to a catch, which connects the pinion to the pump shaft for conjoint rotation.
- This embodiment allows rotatable mounting of the pinion on the outside of the bearing and of the pump shaft in the bearing.
- the catch can be arranged laterally on the pinion and adjacent to the bearing.
- the pump shaft can pass through the catch or the catch can be arranged on one end of the pump shaft.
- the disclosure provides a housing made of cast iron, e.g. gray cast iron. This material is good for primary forming and machining and is a good bearing material. It can be provided with permanent lubrication in the region of the bearing.
- cast iron e.g. gray cast iron. This material is good for primary forming and machining and is a good bearing material. It can be provided with permanent lubrication in the region of the bearing.
- At least one embodiment of the disclosure provides for the pinion not to be arranged directly on the pump shaft but, as already described, for the pinion to be on the outside of the bearing and the pump shaft in the bearing, for example, the bearing thus being situated between the pinion and the pump shaft.
- the internal gear pump according to the disclosure is provided as a hydraulic pump for a hydraulic slip-controlled and/or power-operated vehicle brake system instead of a conventionally used piston pump.
- hydraulic pumps are also referred to as return pumps.
- a housing of the internal gear pump according to the disclosure is configured for installation, insertion or press-fitting in a receptacle provided for this purpose in a hydraulic block of a slip control system.
- the housing of the internal gear pump can also be regarded as a cartridge.
- FIGURE shows an internal gear pump according to the disclosure in a perspective section along the axis.
- the internal gear pump 1 has an internally toothed gearwheel, here referred to as annulus 2 , and an externally toothed gearwheel, here referred to as pinion 3 , which is arranged eccentrically in the annulus 2 in such a way that it meshes with the annulus 2 .
- the two gearwheels 2 , 3 have parallel axes, have the same width and are arranged in the same plane.
- the annulus 2 is press-fitted into a bearing ring 4 , which is rotatably mounted in a sliding manner in a housing 5 .
- the pinion 3 is rotatably mounted in a sliding manner on a bearing 6 , which, in the embodiment of the disclosure illustrated and described, is a hollow cylinder, i.e.
- the bearing 6 is an integral part of the housing 5 of the internal gear pump 1 . Because of its good machining properties and suitability as a bearing material, the housing 5 and hence also the bearing 6 integral with the housing 5 is composed of gray cast iron and is provided with permanent lubrication on the inside and the outside of the bearing 6 . Gray cast iron for the housing 5 of the internal gear pump 1 according to the disclosure is not essential;
- the housing 5 with the bearing 6 can also be composed of some other metallic or nonmetallic material.
- a segment of the circumference in which the gearwheels 2 , 3 mesh with one another has been cut away in the illustrated section along the axis and is therefore not visible.
- the figure shows a segment of the circumference of the gearwheels 2 , 3 in which the gearwheels 2 , 3 do not mesh with one another.
- this segment of the circumference there is a crescent-shaped gap between the annulus 2 and the pinion 3 , this being referred to here as the pump space 7 .
- a dividing element 8 Arranged in the pump space 7 is a dividing element 8 , which divides the pump space 7 into a suction space 9 and a pressure space 10 .
- the dividing element 8 is crescent-shaped and is therefore also referred to as a crescent or crescent element, another designation for the dividing element 8 being “filler piece”.
- the dividing element 8 is the same width as the gearwheels 2 , 3 and its outside and inside have a convex and concave cylindrical curvature, respectively, such that tooth tips of teeth of the gearwheels 2 , 3 rest on the outside and the inside of the dividing element 8 .
- the gearwheels 2 , 3 When the gearwheels 2 , 3 are driven in rotation, the tooth tips of the teeth of the gearwheels 2 , 3 slide along the outside and the inside of the dividing element 8 , and the gearwheels 2 , 3 pump fluid in the gaps between the teeth in a manner known per se on the outside and inside of the dividing element 8 from the suction space 9 to the pressure space 10 .
- the internal gear pump 1 When the internal gear pump 1 is used as a hydraulic pump of a hydraulic vehicle brake system, the fluid is a liquid, namely brake fluid.
- Axial disks 11 that are fixed against relative rotation and capable of axial movement are arranged on both sides of the gearwheels 2 , 3 and of the dividing element 8 , resting on side faces of the gearwheels 2 , 3 and of the dividing element 8 and covering the pump space 7 laterally, at least in the region of the pressure space 10 and of the dividing element 8 .
- the upper axial disk is not depicted because it would conceal the gearwheels 2 , 3 and the dividing element 8 of the internal gear pump 1 .
- Such axial disks 11 are known per se and are also referred to as control disks or pressure plates.
- the internal gear pump 1 has a pump shaft 12 , which is rotatably mounted in a sliding manner in the tubular bearing 6 .
- the pump shaft 12 is sealed off in the housing 5 by a shaft sealing ring 13 and, on the side of the shaft sealing ring 13 facing away from the pinion 3 , is rotatably mounted in the housing 5 by means of a further bearing 14 .
- the further bearing 14 is a ball bearing, but this is not essential for the disclosure.
- a gearwheel as a driving wheel 15 is press-fitted onto the end of the pump shaft 12 or secured for conjoint rotation in some other way on the pump shaft 12 at one end of the housing 5 .
- the bearing 6 is situated within the pinion 3 , passing through a central hole in the pinion 3 , which is referred to here as bearing hole 20 and by means of which the pinion 3 is rotatably mounted in a sliding manner on the bearing 6 , with sliding bearing being preferred but not essential for the disclosure.
- the internal gear pump 1 has a catch 16 , which connects the pinion 3 for conjoint rotation to the pump shaft 12 .
- the catch 16 is arranged on an end of the pump shaft 12 remote from the driving wheel 15 .
- the catch 16 is a stamped and bent sheet metal component or a deep drawn component which is triangular or has the shape of a three-pointed star, which has tabs 17 bent at right angles at its corners that engage in pockets in the bearing hole 20 of the pinion 3 , thereby ensuring that the catch 16 is secured to the pinion 3 for conjoint rotation.
- the pockets are shallow recesses in the bearing hole 16 of the pinion 3 .
- the catch 16 overlaps an annular end face of the bearing 6 and, in its center, has a shallow hoop 18 , which is approximately square when viewed in the axial direction, is formed by deep drawing and engages in a square countersunk hole 19 in the center of the end of the pump shaft 12 .
- the hoop 18 which is integral with the catch 16 , connects the catch 16 to the pump shaft 12 for conjoint rotation by positive engagement in the square countersunk hole 19 .
- the internal gear pump 1 is press-fitted by means of its cylindrical housing 5 , which can also be regarded as a cartridge, into a complementary cylindrical receptacle of a hydraulic block (not shown).
- Such hydraulic blocks are known per se from slip control systems of hydraulic vehicle brake systems. They are typically block-shaped parts made of aluminum having two receptacles for two internal gear pumps 1 and further receptacles for hydraulic components of the slip control system, such as solenoid valves and hydraulic accumulators. The receptacles or the hydraulic components inserted therein are hydraulically interconnected by means of bores in the hydraulic block.
Abstract
An internal gear pump for a hydraulic vehicle brake system includes a bearing formed for a pump shaft in a tubular form. The bearing is integrally formed with a housing of the internal gear pump. The bearing is configured to mount a pinion of the internal gear pump rotatably on the bearing. The internal gear pump also includes a catch configured to connect the pinion to the pump shaft for conjoint rotation.
Description
- This application claims priority under 35 U.S.C. §119 to patent application number DE 10 2013 204 071.7, filed on Mar. 11, 2013 in Germany, the disclosure of which is incorporated herein by reference in its entirety.
- The description relates to an internal gear pump for a hydraulic vehicle brake system having the features described below. Internal gear pumps of this kind are used instead of conventionally used piston pumps in slip-controlled and/or power-operated vehicle brake systems and are often referred to, though not necessarily correctly, as return pumps.
- Internal gear pumps are known. They have an annulus and a pinion, which is arranged eccentrically in the annulus and meshes over a segment of the circumference with the annulus. The annuluses are internally toothed gear wheels, the pinions are externally toothed gearwheels, and the annulus and the pinion can also be regarded as gearwheels of the internal gear pumps. The terms “pinion” and “annulus” are used to distinguish between them. Opposite the segment of the circumference over which the gearwheels mesh there is a crescent-shaped free space between the annulus and the pinion, which is here referred to as a pump space. Arranged in the pump space is a dividing element, on the outside and inside of which tooth tips of the two gearwheels rest and which divides the pump space into a suction space and a pressure space. Owing to its typical shape, the dividing element is often also referred to as a crescent or a crescent element. Another name for the dividing element is “filler piece”. When driven in rotation, the gearwheels pump fluid from the suction space into the pressure space. The prior art also includes internal gear pumps without a dividing element, and these can be referred to as gear ring pumps for the sake of distinguishing them.
- German Offenlegungsschrift DE 43 22 239 A1 discloses an internal gear pump, the pinion of which is arranged rigidly on a pump shaft, which is provided for the purpose of driving the pinion in rotation and, via the pinion, the annulus that meshes with the pinion. On both sides of the pinion, the pump shaft is rotatably mounted in sliding bearings, which are press-fitted into a pump housing.
- The internal gear pump according to the disclosure, having the features described below, has an annulus, a pinion meshing with the annulus, and a pump shaft for driving the pinion and the annulus in rotation. According to the disclosure, a bearing is arranged within the pinion to provide rotatable mounting of the pump shaft, i.e. the bearing is situated in one plane with the pinion and not to the side of the pinion, for instance. However, the bearing can be longer in the axial direction than the width of the pinion and can project from the pinion on one or both sides. For example, the bearing passes through a central hole in the pinion, in particular the pinion is mounted rotatably in the bearing and/or the pump shaft is mounted rotatably on the bearing, which is embodied as a bearing bush, for example. Arranging the bearing within the pinion shortens an overall length of the internal gear pump. A further advantage is radial support for the pinion by the bearing in the plane of the pinion in which an inward-directed force acts on the pinion during the operation of the internal gear pump, said force being exerted on the pinion by fluid from the outside, which is pumped by the internal gear pump and is under pressure in the pressure space between the pinion and the annulus. The radial force acting on the pinion is supported without a moment about an axis transverse to the pump shaft by the bearing arranged within the pinion. This has the additional advantage that the pump shaft is not subjected to bending stress by the radial force acting on the pinion, and this improves pump running and reduces bearing wear. Because the pump shaft is not subjected to bending stress, there is no angular and radial misalignment of a driving wheel, generally a gearwheel, which is fitted for conjoint rotation on the pump shaft to drive the pump shaft in rotation. This improves truth of running of the internal gear pump and reduces wear, friction and noise generation at the driving wheel. Overall, the disclosure improves accuracy of position and truth of running of the pump shaft. The disclosure allows larger production tolerances.
- The description below relates to advantageous embodiments and developments of the disclosure.
- At least one embodiment of the disclosure includes a bearing which is integral with a housing of the internal gear pump, thereby eliminating a separate bearing and the assembly thereof.
- At least one embodiment of the disclosure relates to a catch, which connects the pinion to the pump shaft for conjoint rotation. This embodiment allows rotatable mounting of the pinion on the outside of the bearing and of the pump shaft in the bearing. The catch can be arranged laterally on the pinion and adjacent to the bearing. The pump shaft can pass through the catch or the catch can be arranged on one end of the pump shaft.
- For the formation of the bearing integrally with the housing of the internal gear pump, the disclosure provides a housing made of cast iron, e.g. gray cast iron. This material is good for primary forming and machining and is a good bearing material. It can be provided with permanent lubrication in the region of the bearing.
- At least one embodiment of the disclosure provides for the pinion not to be arranged directly on the pump shaft but, as already described, for the pinion to be on the outside of the bearing and the pump shaft in the bearing, for example, the bearing thus being situated between the pinion and the pump shaft.
- In particular, the internal gear pump according to the disclosure is provided as a hydraulic pump for a hydraulic slip-controlled and/or power-operated vehicle brake system instead of a conventionally used piston pump. In slip-controlled vehicle brake systems, hydraulic pumps are also referred to as return pumps. In this case, a housing of the internal gear pump according to the disclosure is configured for installation, insertion or press-fitting in a receptacle provided for this purpose in a hydraulic block of a slip control system. In this case, the housing of the internal gear pump can also be regarded as a cartridge.
- The disclosure is explained in greater detail below by means of an embodiment illustrated in the drawing. The single FIGURE shows an internal gear pump according to the disclosure in a perspective section along the axis.
- The internal gear pump 1 according to the disclosure illustrated in the drawing has an internally toothed gearwheel, here referred to as
annulus 2, and an externally toothed gearwheel, here referred to as pinion 3, which is arranged eccentrically in theannulus 2 in such a way that it meshes with theannulus 2. The twogearwheels 2, 3 have parallel axes, have the same width and are arranged in the same plane. Theannulus 2 is press-fitted into a bearing ring 4, which is rotatably mounted in a sliding manner in a housing 5. The pinion 3 is rotatably mounted in a sliding manner on abearing 6, which, in the embodiment of the disclosure illustrated and described, is a hollow cylinder, i.e. is tubular, and can also be regarded as a bearing ring or a bearing bush. Thebearing 6 is an integral part of the housing 5 of the internal gear pump 1. Because of its good machining properties and suitability as a bearing material, the housing 5 and hence also the bearing 6 integral with the housing 5 is composed of gray cast iron and is provided with permanent lubrication on the inside and the outside of thebearing 6. Gray cast iron for the housing 5 of the internal gear pump 1 according to the disclosure is not essential; - the housing 5 with the
bearing 6 can also be composed of some other metallic or nonmetallic material. - A segment of the circumference in which the
gearwheels 2, 3 mesh with one another has been cut away in the illustrated section along the axis and is therefore not visible. The figure shows a segment of the circumference of thegearwheels 2, 3 in which thegearwheels 2, 3 do not mesh with one another. In this segment of the circumference there is a crescent-shaped gap between theannulus 2 and the pinion 3, this being referred to here as the pump space 7. Arranged in the pump space 7 is a dividingelement 8, which divides the pump space 7 into a suction space 9 and a pressure space 10. The dividingelement 8 is crescent-shaped and is therefore also referred to as a crescent or crescent element, another designation for the dividingelement 8 being “filler piece”. The dividingelement 8 is the same width as thegearwheels 2, 3 and its outside and inside have a convex and concave cylindrical curvature, respectively, such that tooth tips of teeth of thegearwheels 2, 3 rest on the outside and the inside of the dividingelement 8. When thegearwheels 2, 3 are driven in rotation, the tooth tips of the teeth of thegearwheels 2, 3 slide along the outside and the inside of the dividingelement 8, and thegearwheels 2, 3 pump fluid in the gaps between the teeth in a manner known per se on the outside and inside of the dividingelement 8 from the suction space 9 to the pressure space 10. When the internal gear pump 1 is used as a hydraulic pump of a hydraulic vehicle brake system, the fluid is a liquid, namely brake fluid. -
Axial disks 11 that are fixed against relative rotation and capable of axial movement are arranged on both sides of thegearwheels 2, 3 and of the dividingelement 8, resting on side faces of thegearwheels 2, 3 and of the dividingelement 8 and covering the pump space 7 laterally, at least in the region of the pressure space 10 and of the dividingelement 8. The upper axial disk is not depicted because it would conceal thegearwheels 2, 3 and the dividingelement 8 of the internal gear pump 1. Suchaxial disks 11 are known per se and are also referred to as control disks or pressure plates. - The internal gear pump 1 has a
pump shaft 12, which is rotatably mounted in a sliding manner in thetubular bearing 6. To the side of the pinion 3 and theaxial disk 11 depicted, thepump shaft 12 is sealed off in the housing 5 by ashaft sealing ring 13 and, on the side of theshaft sealing ring 13 facing away from the pinion 3, is rotatably mounted in the housing 5 by means of afurther bearing 14. In the illustrated embodiment of the disclosure, the further bearing 14 is a ball bearing, but this is not essential for the disclosure. To drive the internal gear pump 1, a gearwheel as adriving wheel 15 is press-fitted onto the end of thepump shaft 12 or secured for conjoint rotation in some other way on thepump shaft 12 at one end of the housing 5. - The
bearing 6 is situated within the pinion 3, passing through a central hole in the pinion 3, which is referred to here as bearinghole 20 and by means of which the pinion 3 is rotatably mounted in a sliding manner on thebearing 6, with sliding bearing being preferred but not essential for the disclosure. By means of the rotary bearing of the pinion 3 with thebearing 6 within the pinion 3, i.e. in one plane with the pinion 3, the pinion 3 is supported radially in the plane in which it is situated. - During the operation of the internal gear pump 1, there is a pressure in the pressure space 10 which pushes the pinion 3 radially inward. The pinion 3 is supported against the radial pressure by the
bearing 6 arranged within the pinion 3, the support being provided radially in the same plane in which it is subjected to pressure. The radial support for the pinion 3 is thus moment-free and, in particular, there is no tilting moment about an imaginary axis radial with respect to an axis of the pinion 3. Bending stress on thepump shaft 12 is likewise avoided. - In order to be able to drive the pinion 3 in rotation by means of the
pump shaft 12 to operate the internal gear pump 1, the internal gear pump 1 has acatch 16, which connects the pinion 3 for conjoint rotation to thepump shaft 12. In the embodiment of the disclosure illustrated and described, thecatch 16 is arranged on an end of thepump shaft 12 remote from thedriving wheel 15. In the embodiment of the disclosure illustrated and described, thecatch 16 is a stamped and bent sheet metal component or a deep drawn component which is triangular or has the shape of a three-pointed star, which hastabs 17 bent at right angles at its corners that engage in pockets in thebearing hole 20 of the pinion 3, thereby ensuring that thecatch 16 is secured to the pinion 3 for conjoint rotation. The pockets are shallow recesses in thebearing hole 16 of the pinion 3. Thecatch 16 overlaps an annular end face of thebearing 6 and, in its center, has ashallow hoop 18, which is approximately square when viewed in the axial direction, is formed by deep drawing and engages in a squarecountersunk hole 19 in the center of the end of thepump shaft 12. Thehoop 18, which is integral with thecatch 16, connects thecatch 16 to thepump shaft 12 for conjoint rotation by positive engagement in the squarecountersunk hole 19. - For use in a slip control system of a hydraulic vehicle brake system, the internal gear pump 1 is press-fitted by means of its cylindrical housing 5, which can also be regarded as a cartridge, into a complementary cylindrical receptacle of a hydraulic block (not shown). Such hydraulic blocks are known per se from slip control systems of hydraulic vehicle brake systems. They are typically block-shaped parts made of aluminum having two receptacles for two internal gear pumps 1 and further receptacles for hydraulic components of the slip control system, such as solenoid valves and hydraulic accumulators. The receptacles or the hydraulic components inserted therein are hydraulically interconnected by means of bores in the hydraulic block.
Claims (5)
1. An internal gear pump, comprising:
an annulus;
a pinion arranged eccentrically in the annulus and configured to mesh with the annulus;
a pump shaft configured to drive the pinion and the annulus in rotation; and
a bearing configured to rotatably mount at least one of the pump shaft and the pinion,
wherein the bearing is arranged within the pinion.
2. The internal gear pump according to claim 1 , wherein the bearing is integral with a housing of the internal gear pump.
3. The internal gear pump according to claim 1 , further comprising a catch configured to connect the pinion and the pump shaft for conjoint rotation.
4. The internal gear pump according to claim 2 , wherein the housing of the internal gear pump is cast iron.
5. The internal gear pump according to claim 1 , wherein the pinion is not arranged directly on the pump shaft.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013204071.7A DE102013204071A1 (en) | 2013-03-11 | 2013-03-11 | Internal gear pump |
DE102013204071.7 | 2013-03-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140255236A1 true US20140255236A1 (en) | 2014-09-11 |
Family
ID=51385588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/202,027 Abandoned US20140255236A1 (en) | 2013-03-11 | 2014-03-10 | Internal gear pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US20140255236A1 (en) |
JP (1) | JP6420050B2 (en) |
DE (1) | DE102013204071A1 (en) |
FR (1) | FR3002989A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180238325A1 (en) * | 2015-09-11 | 2018-08-23 | Aisin Seiki Kabushiki Kaisha | Electric pump and method for producing same |
US20190170140A1 (en) * | 2016-08-09 | 2019-06-06 | Nidec Corporation | Drive device |
KR20210145716A (en) | 2019-04-01 | 2021-12-02 | 니폰 덴키 가라스 가부시키가이샤 | Li2O-Al2O3-SiO2 based crystallized glass |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016214762A1 (en) * | 2016-08-09 | 2018-02-15 | Robert Bosch Gmbh | External gear unit |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US3152551A (en) * | 1963-01-25 | 1964-10-13 | Viking Pump Company | Pump |
US6179595B1 (en) * | 1998-05-27 | 2001-01-30 | Luk Getriebe-Systeme Gmbh | Hydraulic gear machine having a transmission shaft in a bearing tube |
US20010026767A1 (en) * | 2000-03-27 | 2001-10-04 | Masatoshi Takagi | Trochoid gear type fuel pump |
US6736609B2 (en) * | 2001-03-19 | 2004-05-18 | Fukui Prefecture | Support apparatus for movable member and pump apparatus |
US7641457B2 (en) * | 2006-03-28 | 2010-01-05 | Jtekt Corporation | Internal gear pump |
US20100130327A1 (en) * | 2008-11-25 | 2010-05-27 | Toyota Motor Engineering & Manufacturing North America, Inc. | Multi-Drive Fluid Pump |
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DE4322239C2 (en) | 1993-07-03 | 1997-04-24 | Eckerle Rexroth Gmbh Co Kg | Internal gear machine (pump or motor) |
JP2006161777A (en) * | 2004-12-10 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Refrigerant pump |
-
2013
- 2013-03-11 DE DE102013204071.7A patent/DE102013204071A1/en not_active Withdrawn
-
2014
- 2014-03-10 US US14/202,027 patent/US20140255236A1/en not_active Abandoned
- 2014-03-10 JP JP2014046858A patent/JP6420050B2/en active Active
- 2014-03-10 FR FR1451933A patent/FR3002989A1/en active Pending
Patent Citations (6)
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US3152551A (en) * | 1963-01-25 | 1964-10-13 | Viking Pump Company | Pump |
US6179595B1 (en) * | 1998-05-27 | 2001-01-30 | Luk Getriebe-Systeme Gmbh | Hydraulic gear machine having a transmission shaft in a bearing tube |
US20010026767A1 (en) * | 2000-03-27 | 2001-10-04 | Masatoshi Takagi | Trochoid gear type fuel pump |
US6736609B2 (en) * | 2001-03-19 | 2004-05-18 | Fukui Prefecture | Support apparatus for movable member and pump apparatus |
US7641457B2 (en) * | 2006-03-28 | 2010-01-05 | Jtekt Corporation | Internal gear pump |
US20100130327A1 (en) * | 2008-11-25 | 2010-05-27 | Toyota Motor Engineering & Manufacturing North America, Inc. | Multi-Drive Fluid Pump |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180238325A1 (en) * | 2015-09-11 | 2018-08-23 | Aisin Seiki Kabushiki Kaisha | Electric pump and method for producing same |
US20190170140A1 (en) * | 2016-08-09 | 2019-06-06 | Nidec Corporation | Drive device |
US10941768B2 (en) * | 2016-08-09 | 2021-03-09 | Nidec Corporation | Drive device |
KR20210145716A (en) | 2019-04-01 | 2021-12-02 | 니폰 덴키 가라스 가부시키가이샤 | Li2O-Al2O3-SiO2 based crystallized glass |
Also Published As
Publication number | Publication date |
---|---|
DE102013204071A1 (en) | 2014-09-11 |
JP6420050B2 (en) | 2018-11-07 |
FR3002989A1 (en) | 2014-09-12 |
JP2014173602A (en) | 2014-09-22 |
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AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AMBROSI, MASSIMILIANO;EISENLAUER, MICHAEL;SCHEPP, RENE;AND OTHERS;SIGNING DATES FROM 20140407 TO 20140409;REEL/FRAME:033212/0151 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |