EP4377567A1 - Kraftstoff-hochdruckpumpe - Google Patents
Kraftstoff-hochdruckpumpeInfo
- Publication number
- EP4377567A1 EP4377567A1 EP22732208.8A EP22732208A EP4377567A1 EP 4377567 A1 EP4377567 A1 EP 4377567A1 EP 22732208 A EP22732208 A EP 22732208A EP 4377567 A1 EP4377567 A1 EP 4377567A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- bore
- outlet
- pump
- low
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/025—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by a single piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/005—Pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
- F04B19/04—Pumps for special use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
Definitions
- an outlet of the pressure-limiting valve is connected to a receiving chamber of a pressure damper of the high-pressure fuel pump, which chamber belongs to the low-pressure region.
- the invention is based on the inventors' observation that the solution known from the prior art leads to a potentially excessive mechanical load on the pressure damper. Because pressure pulsations from the high-pressure area pass through the pressure-limiting valve into the receiving area and there act on the pressure damper, which is actually only designed for low pressure, wear and tear and unwanted noise occur on this damper. In addition, the actual function of the pressure damper to dampen pressure pulsations, the source of which is in the low-pressure area of the high-pressure fuel pump, is impaired.
- the invention therefore provides that the pressure-limiting valve fluidically connects the high-pressure area with the inlet connection space of the low-pressure area and opens towards the inlet connection space, so that fuel flows out of the High-pressure area flows out into the inlet connector space when the pressure difference between fuel in the high-pressure area and fuel in the low-pressure area exceeds an opening pressure.
- the inlet connector space can consist of or comprise the part of the interior of the connector pointing towards the pump housing.
- the inlet connector space can consist of or comprise a recess in the pump body that is covered by the inlet connector.
- the inlet connector space it is possible for the inlet connector space to consist of or include these two partial spaces.
- Pressure relief valve bore and the outlet valve bore are oriented geometrically parallel to one another.
- this facilitates machining, for example machining, of the pump housing to produce the pressure-limiting valve bore and the outlet valve bore, since this machining can take place geometrically parallel to one another and thus, for example, even with the same tool and/or, for example, simultaneously.
- the outlet is designed as an outlet connector fixed to the pump housing.
- the outlet connection has a tubular basic shape and can be welded or screwed to the pump housing, for example.
- the outlet socket space can consist of or comprise the part of the interior space of the socket pointing towards the pump housing.
- the outlet connector space can also include a recess in the pump body that is covered by the outlet connector, and in particular can consist of these two partial spaces.
- the outlet socket space can consist of the recess in the pump body covered by the outlet socket.
- outlet valve bore and the pressure-limiting valve bore both start from the outlet connector space. This reduces the number of parts from which the high-pressure fuel pump is composed and the number of sealing points required in the high-pressure fuel pump.
- pressure-limiting valve bore to be connected to the inlet connector space by a low-pressure connecting bore located in the low-pressure region. In this way, the space available for the fluidic connection, along which the pressure is limited, can be used more optimally.
- the pressure-limiting valve bore and the low-pressure connection bore can, for example, lie together in one plane, in particular perpendicular to the longitudinal direction. It is hereby processed, for example Machining of the pump housing for producing the pressure-limiting valve bore and the low-pressure connection bore is made easier, since this machining can take place in the same plane, and thus, for example, even with the same tool and/or, for example, at the same time.
- the pump housing comprises a pump body and a pump cover, which are connected to one another, with a damping area belonging to the low-pressure area being delimited by the pump body and the pump cover, in which at least one diaphragm damper is arranged, and with a Filter bore is provided, which connects the inlet connection space with the damping space and in which a filter element is arranged, through which the fuel flowing from the inlet connection space to the damping space flows, wherein the low-pressure connection bore and the filter bore intersect.
- the filter bore can fulfill the additional function of conducting the fuel quantity diverted by the pressure-limiting valve to the inlet connection area. There is a dual function of the filter bore, so to speak.
- the pressure-limiting valve bore is closed on the side of its outlet with a ball or a plug, the outlet valve bore being connected to the pressure-limiting valve bore by a high-pressure connection bore located in the high-pressure region.
- the fluidic communication between the outlet and the pressure-limiting valve then takes place through the high-pressure connection hole only inside the pump housing.
- a simple and reliable sealing point is realized by closing the pressure relief valve bore with a ball or a plug.
- the pump housing comprises a pump body and a pump cover, which are connected to one another, with a damping area belonging to the low-pressure area being delimited by the pump body and the pump cover, in which at least one diaphragm damper is arranged, and that the high-pressure communication bore extends from the cushioning section and is closed with a ball or a plug on its outlet side.
- the pressure-limiting valve bore is connected to the inlet connector space by a low-pressure connecting bore located in the low-pressure region, whereby the space available for the fluidic connection, along which the pressure limitation takes place, can also be used more optimally in this case.
- the pressure-limiting valve bore and the low-pressure connection bore lie together in one plane and perpendicular to the longitudinal direction, the advantage results that machining, For example, machining of the pump housing for producing the pressure-limiting valve bore and the low-pressure connection bore is facilitated, since this machining can take place in the same plane and thus, for example, even with the same tool and/or, for example, simultaneously.
- a filter bore is provided in the pump body, which connects the inlet connection space with the damping space and in which a filter element is arranged through which the fuel flowing from the inlet connection space to the damping space flows, with the low-pressure connection bore and cut the filter hole.
- outlet valve bore and the pressure-limiting valve bore are oriented to one another at an angle that differs from 0°, in particular at right angles. This has the advantage that the available installation space can be better utilized.
- the pump housing comprises a pump body and a pump cover, which are connected to one another, with a damping area belonging to the low-pressure area being delimited by the pump body and the pump cover, in which at least one diaphragm damper is arranged, the pressure-limiting valve bore having a is a blind hole starting from the damping area, from which a low-pressure connecting bore branches off, which is in the low-pressure area and which opens into the inlet connector space, and from which a high-pressure connecting bore, which lies in the high-pressure area and opens into the outlet connector space, branches off, with the pressure-limiting valve hole opening its outlet side is closed with a ball or a plug.
- the low-pressure connection hole and the high-pressure connection hole can be oriented parallel to one another. This has the advantage that these bores can be made easily and efficiently, for example by machining the pump housing. for example with the same tool and/or for example at the same time.
- the low-pressure connection bore and the high-pressure connection bore are oriented at an angle other than 0°, in particular at right angles to one another.
- the available installation space can then be used in an optimized manner.
- a bore in particular outlet valve bore, pressure-limiting valve bore, low-pressure connection bore, high-pressure connection bore, etc.
- the bore has an axial symmetry whose axis of symmetry corresponds to the axis of rotation of the twist drill. This axis of symmetry then indicates the direction in which the hole is oriented.
- the bore can basically be a through bore through the pump housing or the pump body or a blind bore which ends at a bore bottom arranged in the pump housing or in the pump body.
- the exit of a bore is the side of the bore that is first produced by machining when the drill penetrates into the pump housing or the pump body. In the case of blind holes, this is always the side opposite the bottom of the hole.
- the mouth of a bore is therefore the side of the bore opposite the outlet of a bore if the bore meets another inner contour of the pump housing or pump body there or emerges from the pump housing or pump body.
- the bores of the present invention are free of undercuts, particularly when viewed from their exit.
- the bore wall in a through bore is the inner contour represented by the through bore;
- the wall of the hole is that part of the inner contour represented by the through hole that is not the bottom of the hole.
- the high-pressure area is understood as meaning the entire space that communicates with the outlet readily, in particular without further interposed valves, so that in A uniform pressure is set in the high-pressure area, for example 500 bar when the pump is in operation.
- the low-pressure area is understood to mean the entire space that communicates with the inlet without further ado, in particular without further interposed valves, so that a uniform pressure is established in the low-pressure area during operation of the pump and when the pump is connected to the inlet Low pressure pump for example 5 bar.
- the inner contours of the high-pressure fuel pump through which fuel flows finally consist of the low-pressure area, the pumping chamber and the high-pressure area. These areas are separated from each other by the inlet valve, the outlet valve and the pressure relief valve.
- the fuel can be, for example, a fuel such as gasoline.
- an angle different from 0° can be an angle that differs significantly from 0°, that is, for example, is at least 2° or at least 5°.
- it can be an angle between 2° and 90°.
- FIG. 1 shows a simplified schematic representation of a fuel system for an internal combustion engine.
- FIG. 2 shows a first exemplary embodiment of the invention.
- FIG. 3 shows a detailed example of a pressure-limiting valve, as can be used in the embodiments.
- FIG. 4 shows a second exemplary embodiment of the invention.
- FIG. 5 shows a third exemplary embodiment of the invention.
- FIG. 6 shows a fourth exemplary embodiment of the invention.
- FIG. 7 shows a fifth exemplary embodiment of the invention.
- FIG. 8 shows a sixth exemplary embodiment of the invention.
- FIG. 1 shows a fuel system 1 for an internal combustion engine (not shown further) in a simplified schematic representation.
- fuel is produced from a fuel tank 2 via a Suction line 4 is fed by means of a pre-supply pump 6 and a low-pressure line 8 via an inlet connection 20 to a high-pressure fuel pump 10 designed as a piston pump.
- An inlet valve 14 is arranged fluidically downstream of the inlet connection piece 20 .
- a low-pressure region 28 of the high-pressure fuel pump 10 is located fluidically between the inlet connection 20 and the inlet valve 14.
- a delivery chamber 16 of the high-pressure fuel pump 10 is located downstream of the inlet valve 14. Pressure pulsations in the low-pressure region 28 can be damped by means of a pressure damper device.
- the inlet valve 14 can be forcibly opened via an actuating device designed here as an electromagnetic actuator 30 .
- the actuating device and thus the intake valve 14 can be controlled via a control unit 32 .
- a pump piston 18 of the high-pressure fuel pump 10 can be moved up and down along a longitudinal axis running in the longitudinal direction LA, to which the pump piston 18 is axially symmetrical, by means of a drive 36 embodied here as a cam disk, which is illustrated in Figure 1 by a double arrow 40 is.
- An outlet valve 37 is arranged fluidically between the pumping chamber 16 and an outlet connection 35 of the high-pressure fuel pump 10 and can open towards the outlet connection 35 and a high-pressure accumulator 45 (“rail”) located further downstream.
- a high-pressure region 29 of the high-pressure fuel pump 10 extends fluidically between the outlet valve 37 and the outlet connection piece 35 .
- the high-pressure area 29 and the low-pressure area 28 are directly connected to one another via a pressure-limiting valve 22, which opens when a limit pressure is exceeded in the high-pressure area 29 of the high-pressure fuel pump 10 or in the high-pressure accumulator 45 communicating with it.
- the pressure-limiting valve 22 is designed as a spring-loaded check valve and can open toward the low-pressure area 28 of the high-pressure fuel pump 10 . In this way, the pressure that can be generated by the high-pressure fuel pump 10 in the high-pressure accumulator 45 is limited.
- Figure 2 shows, as a first exemplary embodiment of the invention, a high-pressure fuel pump 10 in part a) in a sectional view along the plane that appears as line a - a in part b) and in part b) in a sectional view along the plane that appears in Part a) appears as line b - b.
- the high-pressure fuel pump 10 has an inlet 11 designed as an inlet connection piece 20 .
- the inlet 11 communicates with the entire low-pressure area 28 of the high-pressure fuel pump 10 without the interposition of valves.
- the high-pressure fuel pump 10 has an outlet 34 designed as an outlet connector 35 .
- the outlet 34 communicates with the entire high-pressure area 29 of the high-pressure fuel pump 10 without the interposition of valves.
- the outlet connector 35 and the inlet connector 20 are fixed to a pump housing 12 in which a pumping chamber 16 is also arranged, which is delimited by a pump piston 18 that can be displaced along a longitudinal direction LA.
- the low-pressure area 28 includes a damper chamber 28a, which is connected to the inlet 11 via a fluidic connection and which is formed between a pump body 12a of the pump housing 12 and a pump cover 12b of the pump housing 12 .
- a membrane damper 55 is arranged in the damping space 28a, which can have the shape of a flat and compressible box formed by two metal membranes.
- the fluidic connection between the inlet 11 and the damper chamber 28a can, for example, comprise a filter bore, in which a filter element is arranged, which frees a fuel flowing through the filter bore from entrained solid particles above a minimum size.
- a seal carrier 60 is fastened to the lower section of the pump body 12a in FIG. 2a, and a stepped space 28d is formed between the pump body 12a and the seal carrier 60.
- the step chamber 28d communicates with the damping chamber 28a via a step chamber bore 28g visible in Figure 2b through the pump body 12a and is thus part of the low-pressure region 28.
- the conveying chamber 16 is delimited towards the low-pressure region 28 by an inlet valve 14 that opens toward the conveying chamber 16 when there is a corresponding pressure difference.
- the inlet valve 14 can be forced open by a tappet 31 driven by the actuator 30 .
- the actuator 30 has an actuator housing 30a which is fixed to the pump housing 12 and in which an electromagnetic coil 30b is arranged, which can be energized via an externally accessible electrical connection 30c of the high-pressure fuel pump 10 .
- An inlet valve region 28c of the low-pressure region 28 is formed in the pump housing 12 geometrically between the inlet valve 14 and the actuator 30 . It communicates with the damping area 28a via the bore 28f.
- the delivery chamber 16 is delimited towards the high-pressure region 29 by an outlet valve 37 which opens away from the delivery chamber 16 when there is a corresponding pressure difference.
- it is arranged in an outlet valve bore 37a of the pump housing 12 or of the pump body 12a. It has a movable valve element 37.1, which interacts with a sealing seat 37.4, which is formed on a sealing seat part 37.2 arranged on the pump upstream of the valve element 37.1.
- the mobility of the valve element 37.1 in the downstream direction is limited by a counterplate 37.5 fixed to the pump.
- the outlet valve bore 37a starts from an outlet connection space 35a located between the outlet connection 35 and the pump housing 12 or the pump body 12a.
- the pump piston 18 is designed as a stepped piston. Has a first section 18.1 with a larger diameter, pointing towards the conveying chamber 16, and a second section 18.2, pointing away from the conveying chamber, with a smaller diameter (relative to the diameter of the first section 18.1). An annular step 18.3 pointing vertically downwards in FIG. 2a is formed between the first and the second section 18.1, 18.2.
- a high-pressure seal 80 in which the pump piston 18 can be displaced, is arranged between the first section 18.1 and the pump housing 12.
- the high-pressure seal 80 separates the pumping chamber 16 from the low-pressure area 28 in a sealing manner.
- the high-pressure seal 80 can, for example, be a separate sealing ring made of metal or plastic, for example, as explained in more detail in the applicant's WO 19015862 A1.
- the high-pressure seal 80 can also be a narrow gap extending over a certain length between the pump piston 18 and a bushing or between the pump piston 18 and the pump housing 12, for example as explained in more detail in the applicant's WO 06069819 A1.
- a low-pressure seal 78 is arranged between the second section 18.2 and the seal carrier 60 already mentioned above, which seal separates the stepped space 28d of the low-pressure region 28 from the space 100 that is located outside of the high-pressure fuel pump 10.
- the pump piston 18 can be displaced in the low-pressure seal 78 .
- the pump piston 18 is prestressed in the longitudinal direction LA pointing downwards in FIG.
- the high-pressure fuel pump 10 has a pressure-limiting valve 22, which fluidly connects the high-pressure area 29 to the low-pressure area 28 and opens towards the low-pressure area 28, so that fuel flows out of the high-pressure area 29 into the low-pressure area 28 when the pressure difference between fuel in the high-pressure area 29 and fuel in the low pressure region 28 exceeds a cracking pressure.
- the arrangement of the pressure-limiting valve 22 in the high-pressure fuel pump 10 according to the invention will now be discussed further by way of example.
- the pressure-limiting valve 22 is arranged in a pressure-limiting valve bore 22a in the pump housing 12 and for the inlet 11 to be in the form of an inlet connection piece 20 fixed to the pump housing 12, and for an inlet connection piece space 28e of the low-pressure region 28 to be formed between the pump housing 12 and the inlet connection piece 20 ,
- the pressure-limiting valve 22 fluidly connects the high-pressure area 29 to the inlet connection space 28e of the low-pressure area 28 and opens to the inlet connection space 28e, so that fuel from the High-pressure area 29 flows into the inlet connector space 28e when the pressure difference between fuel in the high-pressure area 29 and fuel in the low-pressure area 28 exceeds an opening pressure.
- the pressure-limiting valve bore 22a is connected to the inlet connector space 28e by a low-pressure connecting bore 28b located in the low-pressure region 28 .
- the outlet valve bore 37a and the pressure-limiting valve bore 22a are oriented geometrically parallel to one another.
- the outlet valve bore 37a and the pressure-limiting valve bore 22a are arranged in the plane of the drawing, specifically the outlet valve bore 37a is arranged on the side of the pressure-limiting valve bore 22a remote from the damping area 28a.
- pressure-limiting valve bore 22a also extends from outlet connector space 35a, and that pressure-limiting valve bore 22a is connected to inlet connector space 28e by a low-pressure connecting bore 28b located in low-pressure region 28 and oriented perpendicularly to longitudinal direction LA.
- the low-pressure connection bore 28b can, for example, be perpendicular to a longitudinal axis of the high-pressure fuel pump 10 and/or perpendicular to an axis of symmetry of the pump piston 18 and/or of the diaphragm damper 55 .
- the outlet connector 35 extends in particular transversely to the direction of flow over the outlet of the pressure relief valve bore 22a and over the outlet of the outlet valve bore 37a, so that the
- Pressure-limiting valve bore 22a and the outlet valve bore 37a communicate with one another via the outlet connection space 35a arranged between the pump housing 12 and the outlet connection 35 .
- An (external) diameter with which the outlet connector 35 is fixed to the pump housing in this arrangement is relatively large, for example at least as large as the sum of the diameter of the pressure relief valve bore 22a and the diameter of the Outlet valve bore 37a, in particular even at least as large as 1.2 times this sum.
- the cross section of the pressure relief valve bore 22a can be smaller than the cross section of the outlet valve bore 37a.
- the cross section of the low pressure connection bore 28b can be smaller than the cross section of the pressure relief valve bore 22a, for example by 5% to 35%.
- the pressure-limiting valve bore 22a can be embodied as a blind hole into which the low-pressure connecting bore 28b opens, preferably into the bore wall at a point spaced from the bottom of the pressure-limiting valve bore 22a.
- an axis of the pressure relief valve bore 22a intersects an axis of the low-pressure connection bore 28b at a point of intersection, in particular at right angles, which is spaced from the bore bottom of the pressure relief valve bore 22a by at least 0.6 times of the diameter of the low-pressure connection hole 28b is given, in particular by 1.5 times the diameter of the low-pressure connection hole 28b.
- a spiral spring 52 of the pressure-limiting valve 22 can then lie against the bottom of the pressure-limiting valve bore 22a without overlapping the mouth of the low-pressure connection bore 28b.
- the pressure-limiting valve bore 22a and the low-pressure connection bore 28b can lie together in one plane and perpendicular to the longitudinal direction LA, for example in the drawing plane of part a) of Figure 2.
- the pressure-limiting valve 22 from FIG. 2 (it can also be the pressure-limiting valve 22 shown in FIGS. 4 to 8) is enlarged in FIG. 3 and shown as an example. It has a valve seat body 38 which is pressed into the pressure relief valve bore 22a or into a housing of the pressure relief valve 22 and on which a conical valve seat 42 is formed.
- the pressure relief valve 22 has furthermore, a valve element 44 which has the shape of a sphere and which comes to the valve seat 42 for sealing abutment.
- the valve element 44 is pressed in the closing direction by a holding element 46 and the holding element 46 is pressed in the closing direction by a coil spring 52 .
- the spiral spring 52 is supported on a housing of the pressure relief valve 22 or directly on the pump housing 12 .
- the spiral spring 52 is in contact with a radially outer area 464 of the holding element 46 .
- a radially inner area 465 of the holding element 46 is received by the spiral spring 52 .
- the opening pressure of the pressure limiting valve 22 is defined by the rigidity of the coil spring 52 and by the area effective on the pressure limiting valve 22, and thus at the same time the maximum pressure difference that the high-pressure fuel pump 10 is able to generate between its inlet 11 and its outlet 34.
- FIG. 4 shows a section of a second exemplary embodiment of the invention. It differs from the first exemplary embodiment in that only the outlet valve bore 37a, but not the pressure-limiting valve bore 22a, emanates from the outlet connector space 35a. Instead, it is provided in this exemplary embodiment that the pressure relief valve bore 22a is closed on the side of its outlet 22aa with a ball 56 pressed particularly into the pressure relief valve bore 22a or a plug 57 pressed particularly into the pressure relief valve bore 22a, with the outlet valve bore 37a being connected to the pressure relief valve bore 22a by a in the high-pressure area 29 lying high-pressure connection bore 29a is connected.
- the high-pressure connection bore 29a starts from the damping area 28a and is closed on its outlet side 29aa with a ball 56 pressed into it or a plug 58 pressed into it.
- the outlet port can be made smaller than in the first exemplary embodiment, for example, an (outer) diameter with which the outlet port 35 is fixed to the pump housing 12 in this arrangement can be smaller than the sum of the diameter of the pressure-limiting valve bore 22a and the diameter of the Outlet valve bore 37a, in particular even smaller than 0.9 times this sum.
- the robustness of the connection of the outlet port 35 to the pump housing 12 is increased in this way, because while on the Hydraulic forces acting on the outlet connector 35 are proportional to the cross-sectional area it covers, the connection length with which the outlet connector 35 is fixed to the pump housing 12 is only proportional to the circumference of the cross-sectional area it covers, i.e. proportional to the square root of the cross-sectional area it covers .
- the high-pressure connection bore 29a can have a cross section that is smaller than the respective cross sections of the pressure-limiting valve bore 22a, the outlet valve bore 37a and the low-pressure connection bore 28b, for example each at most half as large.
- An axis of the high-pressure connection bore 29a and an axis of the pressure-limiting valve bore 22a can intersect, in particular intersect at right angles, with an intersection of these axes preferably being at least half a diameter, in particular a full diameter, of the pressure-limiting valve bore 22a away from the outlet of the pressure-limiting valve bore 22a and/or where an intersection of these axes is preferably at least half a diameter, in particular a whole diameter, of the high-pressure connection bore 29b away from the outlet of the high-pressure connection bore 29b.
- the pressure-limiting valve bore 22a and/or the high-pressure connection bore 29b can be closed particularly easily on its outlet side 29aa with a ball 56 pressed into it or a plug 58 pressed into it.
- FIG. 5 shows a third exemplary embodiment of the invention in part a) based on a first sectional illustration along the axis of the pressure-limiting valve bore 22a, which is parallel to the longitudinal direction LA; in part b) based on a second sectional view along the axis of the pressure relief valve bore 22a, compared to part a) rotated about the axis of the pressure relief valve bore 22a; and in part c) based on a top view of the pump body 12a, which is shown partially transparent.
- the outlet valve bore 37a and the pressure-limiting valve bore 22a are oriented at an angle other than 0°, in particular at right angles.
- the outlet 34 is in the form of an outlet connection piece 35 fixed to the pump housing 12 and for an outlet connection piece space 35a to be formed between the pump housing 12 and the outlet connection piece 35, with the pump housing 12 comprising a pump body 12a and a pump cover 12b which are connected to one another, pump body 12a and pump cover 12b delimiting a damping area 28a belonging to low-pressure area 28, in which at least one diaphragm damper 55 is arranged, pressure-limiting valve bore 22a being a blind hole starting from damping area 28a, of which a low-pressure - Connection bore 28b branches off, which is located in the low-pressure area 28 and which opens into the inlet connection space 28e, and from which a high-pressure connection bore 29a branches off, which is located in the high-pressure area 29 and which opens out into the outlet connection space 35a, the
- Pressure relief valve bore 22a is closed on its output side 22aa with a ball 56 or a plug 57.
- the low-pressure connection bore 28b and the high-pressure connection bore 29a are oriented at an angle other than 0°, for example at least 20° or at right angles to one another, see part c) of FIG. 5.
- the low-pressure Connection hole 28b and the high-pressure connection hole 29a be oriented geometrically parallel to one another (not shown).
- a fourth exemplary embodiment of the invention is shown in Figure 6 in part a) in a first partial sectional view which is parallel to the longitudinal axis, in part b) in a second partial sectional view which is rotated about the longitudinal axis compared to the first sectional view, and shown in part c) in a partial sectional view, which is perpendicular to the longitudinal direction LA.
- a filter bore 54a is provided in the pump body 12a, which connects the inlet connection space 28e to the damping space 28a and in which a filter element 54 is arranged, which has the Filters inlet port space 28e to the damping space 28a flowing fuel, wherein the low-pressure connection bore 28b and the filter bore 54a intersect.
- the filter bore 54a on the side of the inlet connector space 28e is closed by a plug 57 or by a ball 56.
- the fluidic communication between the filter bore 54a and the inlet connector space 28e takes place via an additional bore 54b, the opening of which is near the bottom of the filter bore 54a.
- the filter bore 54a can be formed in an unclosed manner between the inlet connector space 28e and the pressure-limiting valve bore 22a, see sixth exemplary embodiment for which FIG. 8 shows the view corresponding to part b) of FIG.
- the additional bore 54b proposed in connection with the fourth exemplary embodiment can easily be dispensed with in the sixth exemplary embodiment.
- a fifth exemplary embodiment of the invention is shown in Figure 7 in part a) in a first partial sectional view which is parallel to its longitudinal axis, in part b) in a second partial sectional view which is rotated about the longitudinal axis in comparison to the first sectional view, and shown in part c) in a partial sectional view, which is perpendicular to the longitudinal direction LA.
- a filter element 54 is arranged, which filters the fuel flowing from the inlet connection space 54a to the damping space 28a, wherein the low-pressure connection bore 28b and the filter bore 54a intersect.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021208119.3A DE102021208119A1 (de) | 2021-07-28 | 2021-07-28 | Kraftstoff-Hochdruckpumpe |
| PCT/EP2022/065635 WO2023006289A1 (de) | 2021-07-28 | 2022-06-09 | Kraftstoff-hochdruckpumpe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4377567A1 true EP4377567A1 (de) | 2024-06-05 |
Family
ID=82117521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22732208.8A Pending EP4377567A1 (de) | 2021-07-28 | 2022-06-09 | Kraftstoff-hochdruckpumpe |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20240360807A1 (de) |
| EP (1) | EP4377567A1 (de) |
| JP (1) | JP7656774B2 (de) |
| KR (1) | KR20240031428A (de) |
| CN (1) | CN118076804A (de) |
| DE (1) | DE102021208119A1 (de) |
| WO (1) | WO2023006289A1 (de) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11200990A (ja) * | 1998-01-07 | 1999-07-27 | Unisia Jecs Corp | 燃料噴射制御装置 |
| DE102004063074B4 (de) | 2004-12-28 | 2013-03-07 | Robert Bosch Gmbh | Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine |
| JP4453028B2 (ja) * | 2005-03-30 | 2010-04-21 | 株式会社デンソー | 高圧燃料ポンプ |
| JP4585977B2 (ja) | 2006-02-20 | 2010-11-24 | 日立オートモティブシステムズ株式会社 | 高圧燃料供給ポンプ及びその組立方法 |
| DE102007016134A1 (de) * | 2006-04-25 | 2007-11-08 | Robert Bosch Gmbh | Kraftstoff-Hochdruckpumpe |
| JP4437552B2 (ja) * | 2006-05-26 | 2010-03-24 | 株式会社デンソー | 高圧燃料ポンプ |
| JP4815455B2 (ja) | 2008-01-21 | 2011-11-16 | 日立オートモティブシステムズ株式会社 | 燃料ポンプ |
| DE102008043217A1 (de) * | 2008-10-28 | 2010-04-29 | Robert Bosch Gmbh | Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine |
| IT1396473B1 (it) * | 2009-03-30 | 2012-12-14 | Magneti Marelli Spa | Pompa carburante con una valvola di massima pressione perfezionata per un sistema di iniezione diretta |
| JP6384413B2 (ja) * | 2015-07-03 | 2018-09-05 | 株式会社デンソー | 高圧ポンプ |
| DE102017212498A1 (de) | 2017-07-20 | 2019-01-24 | Robert Bosch Gmbh | Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine |
| KR102107464B1 (ko) * | 2018-12-20 | 2020-05-07 | 주식회사 현대케피코 | 고압펌프 |
-
2021
- 2021-07-28 DE DE102021208119.3A patent/DE102021208119A1/de active Pending
-
2022
- 2022-06-09 EP EP22732208.8A patent/EP4377567A1/de active Pending
- 2022-06-09 WO PCT/EP2022/065635 patent/WO2023006289A1/de not_active Ceased
- 2022-06-09 CN CN202280065812.7A patent/CN118076804A/zh active Pending
- 2022-06-09 JP JP2024505254A patent/JP7656774B2/ja active Active
- 2022-06-09 US US18/291,869 patent/US20240360807A1/en active Pending
- 2022-06-09 KR KR1020247006233A patent/KR20240031428A/ko active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN118076804A (zh) | 2024-05-24 |
| JP7656774B2 (ja) | 2025-04-03 |
| US20240360807A1 (en) | 2024-10-31 |
| KR20240031428A (ko) | 2024-03-07 |
| JP2024528051A (ja) | 2024-07-26 |
| WO2023006289A1 (de) | 2023-02-02 |
| DE102021208119A1 (de) | 2023-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE112011105490B4 (de) | Kraftstoffpumpe | |
| EP2294316B1 (de) | Kolbenpumpe einer hydraulischen fahrzeugbremsanlage | |
| EP2013469A1 (de) | Kraftstoff-hochdruckpumpe | |
| EP2273115A1 (de) | Fluidpumpe, insbesondere Kraftstoffhochdruckpumpe, mit Druckdämpfer | |
| WO2014139698A1 (de) | Kraftstoff-hochdruckpumpe mit einem zwischen einem förderraum und einem auslass angeordneten auslassventil | |
| EP2483560B1 (de) | Pumpe für ein hochdruckreinigungsgerät | |
| EP2483558B1 (de) | Pumpe für ein hochdruckreinigungsgerät | |
| EP1554490A1 (de) | Ventil zum steuern von fl ssigkeit | |
| DE102013224816A1 (de) | Kraftstoff-Hochdruckpumpe, mit einem zwischen einem Förderraum und einem Auslass angeordneten und zum Auslass hin öffnenden Auslassventil | |
| EP1753989B1 (de) | Rückschlagventil | |
| WO2023006289A1 (de) | Kraftstoff-hochdruckpumpe | |
| EP4124745B1 (de) | Kraftstoff-hochdruckpumpe | |
| EP4377565B1 (de) | Kraftstoff-hochdruckpumpe | |
| DE19852409A1 (de) | Druckbegrenzungsventil, insbesondere für Fahrzeuge | |
| WO2014079625A1 (de) | Ventileinrichtung zur verwendung in einem kraftstoffeinspritzsystem | |
| WO2022218850A1 (de) | Kraftstoff-hochdruckpumpe | |
| EP4377566A1 (de) | Kraftstoff-hochdruckpumpe | |
| DE102018201279B4 (de) | Hochdruckanschluss für eine Kraftstoffhochdruckpumpe eines Kraftstoffeinspritzsystems sowie Kraftstoffhochdruckpumpe | |
| EP4048885A1 (de) | Kraftstoff-hochdruckpumpe | |
| DE102021209839A1 (de) | Kraftstoff-Hochdruckpumpe | |
| DE102010029123A1 (de) | Kraftstoffinjektor mit hydraulischer Kopplereinheit | |
| DE102007030224A1 (de) | Kraftstoffpumpe, insbesondere für ein Kraftstoffsystem einer Brennkraftmaschine | |
| DE3919939C2 (de) | Hydrostatischer Antrieb | |
| DE102021209835A1 (de) | Kraftstoff-Hochdruckpumpe | |
| DE102022208783A1 (de) | Kraftstoff-Hochdruckpumpe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20240228 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |