CN109790807B - Throttling element, high-pressure pump, low-pressure circuit of fuel injection system - Google Patents

Throttling element, high-pressure pump, low-pressure circuit of fuel injection system Download PDF

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Publication number
CN109790807B
CN109790807B CN201780061768.1A CN201780061768A CN109790807B CN 109790807 B CN109790807 B CN 109790807B CN 201780061768 A CN201780061768 A CN 201780061768A CN 109790807 B CN109790807 B CN 109790807B
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CN
China
Prior art keywords
bore
throttle
injection system
pressure pump
valve seat
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Active
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CN201780061768.1A
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Chinese (zh)
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CN109790807A (en
Inventor
H·艾泽勒
P·塞尔韦斯特
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M59/447—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 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • 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
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • 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
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Abstract

The invention relates to a throttle element (1), in particular for a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, comprising a body (2) having a bore (3) designed as an axial bore, into which a throttle bore (4) designed as a radial bore opens. According to the invention, a non-return valve (5) is integrated into the bore (3), said non-return valve comprising at least one valve seat (6, 7) and a closing element (8) interacting with the valve seat (6, 7). The invention also relates to a high-pressure pump and a low-pressure circuit for a fuel injection system, in particular a common rail injection system, having such a throttle element.

Description

Throttling element, high-pressure pump, low-pressure circuit of fuel injection system
Technical Field
The invention relates to a throttle element, in particular for a low-pressure circuit of a fuel injection system, in particular of a common rail injection system. The invention also relates to a high-pressure pump and a low-pressure circuit having such a throttle element, which is used, in particular, to form a zero-feed throttle.
Background
From the prior art, a throttle element is known which can be inserted into a fuel passage of a low-pressure circuit of a fuel injection system and is used to form a zero-delivery throttle. Such a throttle element is known, for example, from DE 102009001564 a 1.
The throttle element described in DE 102009001564 a1 serves to discharge the leakage of a metering unit which is connected upstream of the high-pressure fuel pump for quantity control. If no delivery is to be made by the high-pressure pump during zero delivery operation, the leakage occurring via the metering unit must be discharged. The throttle element assumes this task and for this purpose has a body which can be inserted into the fuel passage in such a way that it throttles the fuel flow flowing in the main flow direction. At least one throttle opening is provided in the body, which throttle opening is embodied as a radial bore and connects an annular space surrounding the body with a longitudinal bore of the body. Thus, the throttle opening is impinged upon from radially outside. In order to prevent the entry of particles, a filter device embodied as a gap filter is located before the throttle opening. Since the throttle element is flowed through not only in the main flow direction but also, if appropriate, in the opposite direction depending on the pressure conditions, a further filter device is provided at the other end of the throttle element.
Disclosure of Invention
Starting from the prior art described above, the object of the present invention is to provide a throttle element, in particular for a low-pressure circuit of a fuel injection system, which has a high functional safety and can also be produced simply and inexpensively. The throttle element according to the invention comprises a body having a bore embodied as an axial bore, into which bore an orifice hole embodied as a radial bore opens, wherein a check valve is integrated into the bore, which check valve comprises at least one valve seat and a closing element interacting with the valve seat, wherein the orifice hole is arranged in the region of a constriction on the outer circumferential side of the body.
This object is achieved by a throttle element according to the invention. The following provides advantageous embodiments of the invention. Furthermore, a high-pressure pump and a low-pressure circuit having such a throttle element are proposed.
The throttle element, which is preferably used for a low-pressure circuit, in particular for a fuel injection system, in particular for a low-pressure circuit of a common rail injection system, comprises a body, which is preferably circular in cross section, having a bore embodied as an axial bore, into which a throttle bore, which is embodied as a radial bore, opens. The bore is configured in particular as a central bore along the longitudinal axis of the substantially cylindrical body. According to the invention, a check valve is integrated into the throttle element, said check valve comprising at least one valve seat and a closing element interacting with the valve seat. The integrated non-return valve ensures that the throttle element is flowed through in only one direction when the throttle element is inserted as a zero-delivery throttle into the low-pressure circuit of the fuel injection system. In this way, the entrainment of particles by the returning fuel is safely prevented. Therefore, no additional filter device and/or no additional check valve is required in the return line of the low-pressure circuit.
The number of components required is reduced by the proposed functional integration. Thus reducing manufacturing and assembly costs. Furthermore, the installation space requirement is reduced. Furthermore, the throttle element has a high functional safety when the check valve is designed as a double seat valve. Since the amount of losses during high pressure delivery can be reduced to a minimum. And simultaneously, the efficiency of the high-pressure pump is improved.
Preferably, the closing element is loaded in the direction of the first valve seat by the spring force of a spring. The opening pressure of the check valve can be predetermined by the spring force of the spring. Preferably, the check valve opens against the spring force of the spring when the pressure in the inflow region of the high-pressure pump rises above a predefined limit value.
Advantageously, the first valve seat is formed by a shoulder of the throttle element body in the bore. For this purpose, the bore is preferably embodied as a stepped bore. Alternatively or additionally, the bore may be at least partially conically formed, for example, to form a conical valve seat.
The closing element interacting with the at least one valve seat is preferably spherical in shape, so that a sealing seat is produced by a circular sealing line. In this way a high sealing force can be achieved. While ensuring self-centering of the closure element with respect to the valve seat.
Furthermore, the closing element preferably interacts with a further valve seat in order to minimize or prevent the formation of losses during high-pressure delivery. The further valve seat is opposite the first valve seat, so that the closing element can assume a position between the two valve seats for discharging the leakage. When the pressure conditions change, the closing element can bear against the first or second valve seat in order to prevent fuel from flowing either back into the inflow region or out of the inflow region.
According to a preferred embodiment of the invention, the further valve seat is formed by a sleeve which is inserted, in particular pressed, into the bore of the body of the throttle element. In this way, the further valve seat can be realized simply and inexpensively.
It is also proposed that the sleeve for forming the further valve seat has an annular collar. The annular flange can be used to support a spring, by means of the spring force of which the closing element is prestressed in the direction of the first valve seat. If the sleeve is pressed into the bore of the body, the spring force of the spring can be adjusted by the depth of the press-in.
In order to prevent the throttle bore of the throttle element from being bypassed, it is proposed that the bore formed in the body is embodied as a blind bore into which the throttle bore opens. I.e. the body of the throttle element is embodied as closed or solid in at least one section. This section is located upstream of the throttle bore, so that it can be used at the same time to delimit an annular gap, which forms a gap filter located upstream of the throttle bore.
The throttle bore itself is preferably arranged in the constriction region on the outer circumference of the body. The constriction results in an annular space being formed in front of the throttle bore, in which the leakage quantity to be discharged can accumulate.
Since the throttle element according to the invention produces its advantages in particular when used in a low-pressure circuit of a fuel injection system, a low-pressure circuit for a fuel injection system, in particular a common rail injection system, is also proposed, which has such a throttle element for forming a zero-delivery throttle. For this purpose, the throttle element is inserted, in particular pressed, into the fuel passage of the low-pressure circuit. Since no thread has to be cut, the press-fit connection can be realized particularly simply and inexpensively.
Preferably, the fuel passage receiving the throttle element is formed in a housing part of the high-pressure pump, in particular by: the fuel passage can be connected to the return of the low-pressure circuit via a throttle element. Thus, the amount of leakage discharged into the return portion via the throttling element remains in the system, thereby further improving the efficiency of the system.
It is also proposed that the body of the throttle element delimits an annular space in the fuel duct, which annular space is connected to the aforementioned bore via a throttle bore. In this case, the fluid flows via the annular space to the throttle bore. If the annular space is configured as an annular gap, a filter function can be simultaneously achieved.
Drawings
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings. The figures show:
figure 1 is a schematic illustration of a fuel injection system,
figure 2 is a schematic longitudinal section of a throttle element according to the invention in the closed position,
FIG. 3 the throttling element of FIG. 1 in an open position, an
FIG. 4 is the throttling element of FIG. 1 in another closed position.
Detailed Description
The fuel injection system 1 according to fig. 1 comprises a delivery pump 100 which takes in fuel 101 from a reservoir 102 and delivers it to a high-pressure pump 104 by filtration through a main filter 103. Here, the fuel 101 flows through a low-pressure circuit 105 of the high-pressure pump 104 (which is also only schematically illustrated here) and is then supplied to a metering unit 106. The metering unit 106 meters the fuel quantity in accordance with the demand demanded by the internal combustion engine and delivers the fuel quantity set thereby to a high-pressure circuit 108 of the high-pressure pump 104 via a supply line 107. The supplied fuel is then compressed in a generally known manner in the high-pressure circuit 108 and is subsequently conducted to a pressure accumulator 109, which is only partially shown here, from which the fuel 101 is extracted at high pressure for operating the internal combustion engine.
Furthermore, the low-pressure circuit 105 of the high-pressure pump 104 is connected to the reservoir 102 via a return 110, so that excess fuel that accumulates on the low-pressure region side as a result of leakage losses in the transmission chamber of the high-pressure pump 104 can flow back into the reservoir 102 via this path.
The excess fuel which is provided by the metering unit 106 but is not processed by the high-pressure pump 104 is also returned to the reservoir 102 via the throttle element 1, which serves as a zero-delivery throttle, by means of a further return 111. The throttle element 1 can be designed as a separate component or as a component of the high-pressure pump 104.
The throttle element 1 shown in fig. 2 comprises a cylindrical body 2. The body 2 has a press fit interference in the end section 18 with respect to the fuel passage 14 of the housing part 15 of the high-pressure pump, into which the throttle element 1 is pressed directly according to this exemplary embodiment. This press fit simultaneously seals the inflow region of the fuel passage 14 upstream of the throttle element 1 from the return 16.
The body 2 has a constriction 13 in the middle region, by means of which an annular space 17 is formed in the fuel channel 14. In the region of the constriction 13, an orifice 4 embodied as a radial bore is formed in the body 2, by means of which orifice the annular space 17 is connected to the bore 3 embodied as a radial bore of the body 2. In order to keep the harmful particles away from the throttle bore 4, an annular gap 19 is located in front of the annular space 17, which annular gap constitutes a gap filter.
In order to ensure that the throttle element 1 is flowed through only in one direction, in particular in the direction of the return 16, a non-return valve 5 is integrated into the throttle element 1. The non-return valve comprises a spherical closing element 8 which is received in the bore 3 of the body 2 so as to be movable back and forth between the two valve seats 6, 7. A spring 9 is supported on the closing element 8, which pretensions the closing element against the first valve seat 6, which is formed by a shoulder 10 in the bore 3. When the pressure in the return 16 approximately corresponds to the pressure in the inflow region, the spring 9 keeps the check valve 5 closed. In this way, it is ensured that fuel is not returned from the return 16 into the inflow region.
In order to discharge the fuel from the inflow region into the return 16, the check valve 5 must be opened against the spring force of the spring 9. This is the case when the pressure in the inflow region reaches a predetermined limit value, so that the closing element 8 is lifted from the valve seat 6 against the spring force of the spring 9 (see fig. 3).
When the pressure in the inflow region rises further, the closing element 8 bears against a further valve seat 7, which is formed by a sleeve 11 pressed into the bore 3 of the body 2 (see fig. 4). The sleeve 11 has an annular flange 12 on which the spring 9 is supported.

Claims (21)

1. Throttling element (1) comprising a body (2) with a bore (3) embodied as an axial bore into which a throttling orifice (4) configured as a radial bore opens, wherein a non-return valve (5) is integrated into the bore (3), which non-return valve comprises at least one valve seat (6, 7) and a closing element (8) interacting with the valve seat (6, 7),
characterized in that the throttle bore (4) is arranged in the region of a constriction (13) on the outer circumference of the body (2).
2. Throttling element (1) according to claim 1,
characterized in that the throttle element (1) is a throttle element for a low-pressure circuit of a fuel injection system.
3. Throttling element (1) according to claim 2,
characterized in that the fuel injection system is a common rail injection system.
4. A throttling element (1) according to any one of claims 1 to 3,
characterized in that the closing element (8) is acted upon by the spring force of a spring (9) in the direction of the first valve seat (6).
5. Throttling element (1) according to claim 4,
characterized in that the first valve seat (6) is formed by a shoulder (10) of the body (2) in the bore (3).
6. A throttling element (1) according to any one of claims 1, 2, 3 and 5,
characterized in that the closing element (8) is spherical in shape.
7. Throttling element (1) according to claim 4,
characterized in that the closing element (8) interacts with a further valve seat (7).
8. Throttling element (1) according to claim 7,
characterized in that the further valve seat (7) is formed by a sleeve (11) inserted into the bore (3).
9. Throttling element (1) according to claim 7,
characterized in that the further valve seat (7) is formed by a sleeve (11) pressed into the bore (3).
10. Throttling element (1) according to claim 8 or 9,
characterized in that the sleeve (11) has an annular flange (12).
11. Throttling element (1) according to claim 10,
characterized in that the spring (9) is supported on the annular flange.
12. A restriction element (1) according to any of claims 1, 2, 3, 5, 7, 8, 9 and 11,
characterized in that the holes (3) are embodied as blind holes.
13. A high-pressure pump having a throttle element (1) according to any one of claims 1 to 12.
14. The high-pressure pump as set forth in claim 13,
characterized in that the throttle element (1) is inserted into a fuel passage (14) of the high-pressure pump (104) for forming a zero delivery throttle.
15. The high-pressure pump as set forth in claim 14,
characterized in that the throttle element (1) is a throttle element for a low-pressure circuit of a fuel injection system, the fuel passage (14) being formed in a housing part (15) of a high-pressure pump (104) and being connectable to a return (16) of the low-pressure circuit via the throttle element (1).
16. The high-pressure pump according to claim 14 or 15,
characterized in that the body (2) delimits an annular space (17) in the fuel channel (14), said annular space being connected to the bore (3) via the throttle bore (4).
17. The high-pressure pump as set forth in claim 13,
characterized in that the high-pressure pump is a high-pressure pump for a fuel injection system.
18. The high-pressure pump as set forth in claim 17,
characterized in that the fuel injection system is a common rail injection system.
19. The high-pressure pump as set forth in claim 14,
characterized in that the throttle element (1) is pressed into a fuel passage (14) of the high-pressure pump (104).
20. A low-pressure circuit of a fuel injection system, having a throttle element (1) according to any one of the preceding claims 1 to 12.
21. The low-pressure circuit of claim 20,
characterized in that the fuel injection system is a common rail injection system.
CN201780061768.1A 2016-10-07 2017-09-22 Throttling element, high-pressure pump, low-pressure circuit of fuel injection system Active CN109790807B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016219486.0 2016-10-07
DE102016219486.0A DE102016219486A1 (en) 2016-10-07 2016-10-07 Throttling element, in particular for a high pressure pump, in particular a low pressure circuit of a fuel injection system
PCT/EP2017/073991 WO2018065235A1 (en) 2016-10-07 2017-09-22 Throttle element, in particular for a high-pressure pump, in particular of a low-pressure circuit of a fuel injection system

Publications (2)

Publication Number Publication Date
CN109790807A CN109790807A (en) 2019-05-21
CN109790807B true CN109790807B (en) 2021-07-06

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