GB2304830A - High-pressure fuel pump for an internal combustion engine - Google Patents

High-pressure fuel pump for an internal combustion engine Download PDF

Info

Publication number
GB2304830A
GB2304830A GB9617374A GB9617374A GB2304830A GB 2304830 A GB2304830 A GB 2304830A GB 9617374 A GB9617374 A GB 9617374A GB 9617374 A GB9617374 A GB 9617374A GB 2304830 A GB2304830 A GB 2304830A
Authority
GB
United Kingdom
Prior art keywords
fuel pump
pressure fuel
spring element
pressure
internal combustion
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.)
Granted
Application number
GB9617374A
Other versions
GB2304830B (en
GB9617374D0 (en
Inventor
Erwin Schmidt
Martin Bullwinkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Publication of GB9617374D0 publication Critical patent/GB9617374D0/en
Publication of GB2304830A publication Critical patent/GB2304830A/en
Application granted granted Critical
Publication of GB2304830B publication Critical patent/GB2304830B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F04B1/043—Hydraulic arrangements
    • 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

Description

- 1.1 2304830 1 High-pressure fuel pump for an internal combustion engine
The invention relates to a high-pressure fuel pump for an internal combustion engine, with a pump piston actuatable by the cam of a camshaft via a roller tappet and which, during the inwards stroke, acts counter to the force of a prestressed spring element, of which one end is supported, on the tappet side, on a spring plate and the other end is supported on a support body.
German Auslegeschrift 11 07 025 and DE 34 09 295 C2 disclose a highpressure fuel pump of this type for internal combustion engines, in which the tappet-side support body serving for supporting the spring element constitutes at the same time a limitation for an oil-pressure space, into which liquid can flow between the support body and the roller tappet in dependence on the respective position of the roller tappet. The support body, acting as a piston, can thereby be raised relative to the roller tappet counter to the force of the spring element, with the result that a variation in the injection time occurs, since the pump piston cuts off or closes the inflow control bore earlier by means of its control edge located on the end face.
The present invention seeks to develop a highpressure fuel pump of this type in such a way that the drive power of the camshaft and the wear on the cam and the roller of the roller tappet are reduced.
According to the present invention there is provided a high-pressure fuel pump for an internal combustion engine, with a pump piston actuatable by a cam of a camshaft via a roller tappet and which, when acuated by the cam, acts counter to the force of a prestressed spring element biassing the roller tappet into contact with the cam, of which one end is supported, on the tappet side, on a spring plate and the other end is supported on an adjustable support body, wherein the prestressing force of the spring element is, with increasing rotational speed of the engine, 2 adapted to be raised by means of the support body being loadable with pressure in dependence on said rotational speed.
Preferably, the pressure-loadable support body comprises an annular body guided approximately level with the longitudinal centre of the pump piston.
In such a case, the annular body is, preferably mounted longitudinally displaceably in a pump casing in a correspondingly adapted annular recess and, on its side facing away from the spring element, forms, together with the pump casing, a sealed-off pressure space connected to a pressure control conduit.
The spring element may consist of a shape memory alloy or a coil compression spring.
The measures according to the invention prevent in a simple way unnecessarily high spring forces from acting on the cam in a rotational speed range which is below the maximum rotational speed of the camshaft. Thus, despite the use of a relatively weak spring, the press-on system dependent on rotational speed reliably guarantees that the roller tappet bears uniformly on the cam.
In the known high-pressure fuel pump, the spring force pressing the roller tappet onto the cam is designed for the maximum rotational speed of the camshaft, in order, at high rotational speeds, to prevent a liftingoff of the roller tappet from the cam and consequently disturbances in the feed and injection characteristics.
The subject of the invention is represented in the drawing and is explained in more detail below by means of an exemplary Figure 1 Figure 2 embodiment. In the drawing: shows a high-pressure fuel pump with positioning of the pressure-loadable support body at low rotational speeds of the camshaft, and shows positioning of the support body at high rotational speeds of the camshaft.
A cam-actuated high-pressure fuel pump 1, which is 3 provided for internal combustion engines and which can, for example, be a solenoid-controlled plug-in pump for commonrail systems, consists of a roller tappet 4, driven by the cam 2 of a camshaft 3, for actuating a simple pump piston 5 without control edges controlling the fuel quantity. The pump 1 has a spring element 6 which is designed as a compression spring and which is supported, on the one hand, on a spring plate 8 lying on the bottom 7 of the cup-shaped tappet 4a and, on the other hand, on a support body 9 which is arranged approximately level with the longitudinal centre of the pump piston 5 and which, being designed as an annular body, is guided longitudinally displaceably in the pump casing 11 in an annular recess 10 adapted to the annular body and is sealed by means of sealing rings 12, 13.
The annular body, on its side facing away from the spring element 6, forms, together with the pump casing 11, a pressure space 14 which is connected to a control conduit 15. Oil is conveyed via this control conduit 15 out of the lubricating-oil circuit of the internal combustion engine (not shown) into the pressure space 14.
The oil pressure acting on the annular body 9 is generated by a pressure pump 16, for example a gear pump, which builds up the necessary pressure in dependence on the engine speed. Thus, with an increase in rotational speed of the camshaft 3, the roller 4b of the roller tappet 4 is pressed, via the annular body 9 and the spring element 6, with an exactly defined pressure force onto the cam 2 in conformity with the rising oil pressure in the pressure space 14. A reliable bearing of the roller tappet 4 on the cam 2 is achieved by means of the prestressing force dependent on rotational speed.
With decreasing rotational speed of the camshaft, the pressure in the pressure space 14 subsides, the annular body 9 moves back correspondingly, and the spring element 6 relaxes and consequently reduces the pressure of the roller 4b on the cam 2.
4 The sealing rings 12, 13 on the annular body 9, which are designed as so- called 0-rings, ensure substantially fault-free functioning.
However, the spring element 6, which is designed as a compression spring in the exemplary embodiment represented, can also consist of a shape memory alloy which changes its properties with increasing frequency in relation to the rotational speed of the camshaft, to the effect that the spring rigidity (spring constant) increases and therefore also guarantees that the roller tappet 4 bears reliably on the cam 2.
The shape memory alloy thus ensures that the spring element 6 is softer at low rotational speeds, but harder at high rotational speeds.

Claims (6)

  1. Claims
    I. A high-pressure fuel pump f or an internal combustion engine, with a pump piston actuatable by a cam of a camshaft via a roller tappet and which, when acuated by the can, acts counter to the force of a prestressed spring element biassing the roller tappet into contact with the cam, of which one end is supported, on the tappet side, on a spring plate and the other end is supported on an adjustable support body, wherein the prestressing force of the spring element is, with increasing rotational speed of the engine, adapted to be raised by means of the support body being loadable with pressure in dependence on said rotational speed.
  2. 2. A high-pressure fuel pump according to Claim 1, wherein the pressureloadable support body comprises an annular body guided approximately level with the longitudinal centre of the pump piston.
  3. 3. A high-pressure fuel pump according to Claim 2, wherein the annular body is mounted longitudinally displaceably in a pump casing in a correspondingly adapted annular recess and, on its side facing away from the spring element, forms, together with the pump casing, a sealed-off pressure space connected to a pressure control conduit.
  4. 4. A high-pressure fuel pump according to Claim 1, 2 or 3, wherein the spring element consists of a shape memory alloy.
  5. 5. A high-pressure fuel pump according to Claim 1, 2 or 3, wherein the spring element consists of a coil compression spring.
    1 6
  6. 6. A high-pressure fuel pump for an internal combustion engine, substantially as described herein with reference to, and as illustrated in, the accompanying drawings.
GB9617374A 1995-08-30 1996-08-19 High-pressure fuel pump for an internal combustion engine Expired - Fee Related GB2304830B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19531873A DE19531873C1 (en) 1995-08-30 1995-08-30 Fuel high pressure pump for internal combustion engine

Publications (3)

Publication Number Publication Date
GB9617374D0 GB9617374D0 (en) 1996-10-02
GB2304830A true GB2304830A (en) 1997-03-26
GB2304830B GB2304830B (en) 1997-08-20

Family

ID=7770742

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9617374A Expired - Fee Related GB2304830B (en) 1995-08-30 1996-08-19 High-pressure fuel pump for an internal combustion engine

Country Status (4)

Country Link
DE (1) DE19531873C1 (en)
FR (1) FR2738296B1 (en)
GB (1) GB2304830B (en)
IT (1) IT1284239B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2600765B (en) * 2020-11-10 2023-04-05 Delphi Tech Ip Ltd Fuel pump assembly
US11982252B2 (en) 2020-11-10 2024-05-14 Phinia Delphi Luxembourg Sarl Fuel pump assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9815272D0 (en) * 1998-07-14 1998-09-09 Lucas Ind Plc Positive displacement pumps
DE10047188B4 (en) * 2000-09-23 2005-08-18 Daimlerchrysler Ag High-pressure pump for a Hochdruckeinspritzsytem an air-compressing internal combustion engine
DE102010011456A1 (en) * 2010-03-15 2011-09-15 Schaeffler Technologies Gmbh & Co. Kg Pump, in particular piston pump for high or low pressure
FI124006B (en) * 2011-09-30 2014-01-31 Waertsilae Finland Oy Fuel injection pump arrangement and method for operating an internal combustion engine
DE102015218698A1 (en) 2015-09-29 2017-03-30 Continental Automotive Gmbh High-pressure fuel pump
CN107781085A (en) * 2017-10-10 2018-03-09 重庆电子工程职业学院 A kind of automobile injection pump assembly structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234292A (en) * 1977-05-27 1980-11-18 Klockner-Humboldt-Deutz Aktiengesellschaft Fuel injection pump, especially for internal combustion engines
GB2101229A (en) * 1981-06-20 1983-01-12 Lucas Ind Plc Fuel injection pumping apparatus for internal combustion engines
US4842496A (en) * 1984-03-14 1989-06-27 Robert Bosch Gmbh Fuel injection pump for internal combustion engines including onset of supply control means
GB2266934A (en) * 1992-05-13 1993-11-17 Bosch Gmbh Robert Cold-starting devices for fuel injection pumps.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1107025B (en) * 1956-07-09 1961-05-18 Napier & Son Ltd Fuel injection pump with overflow control for internal combustion engines
DE1123517B (en) * 1959-03-19 1962-02-08 Daimler Benz Ag Device for adjusting the injection timing in internal combustion engines
DE3330353A1 (en) * 1983-08-23 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection pump for internal combustion engines
US4553393A (en) * 1983-08-26 1985-11-19 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Memory metal actuator
DE3731241C2 (en) * 1987-09-17 1995-05-18 Volkswagen Ag Cam control arrangement for a roller tappet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234292A (en) * 1977-05-27 1980-11-18 Klockner-Humboldt-Deutz Aktiengesellschaft Fuel injection pump, especially for internal combustion engines
GB2101229A (en) * 1981-06-20 1983-01-12 Lucas Ind Plc Fuel injection pumping apparatus for internal combustion engines
US4842496A (en) * 1984-03-14 1989-06-27 Robert Bosch Gmbh Fuel injection pump for internal combustion engines including onset of supply control means
GB2266934A (en) * 1992-05-13 1993-11-17 Bosch Gmbh Robert Cold-starting devices for fuel injection pumps.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2600765B (en) * 2020-11-10 2023-04-05 Delphi Tech Ip Ltd Fuel pump assembly
US11982252B2 (en) 2020-11-10 2024-05-14 Phinia Delphi Luxembourg Sarl Fuel pump assembly

Also Published As

Publication number Publication date
FR2738296B1 (en) 1999-07-23
DE19531873C1 (en) 1996-11-07
GB2304830B (en) 1997-08-20
FR2738296A1 (en) 1997-03-07
GB9617374D0 (en) 1996-10-02
IT1284239B1 (en) 1998-05-14
ITRM960541A1 (en) 1998-01-29
ITRM960541A0 (en) 1996-07-29

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010819