EP2660456A1 - Fuel pump - Google Patents
Fuel pump Download PDFInfo
- Publication number
- EP2660456A1 EP2660456A1 EP12166297.7A EP12166297A EP2660456A1 EP 2660456 A1 EP2660456 A1 EP 2660456A1 EP 12166297 A EP12166297 A EP 12166297A EP 2660456 A1 EP2660456 A1 EP 2660456A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- advance
- pump
- fuel pump
- rotor
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 104
- 230000001419 dependent effect Effects 0.000 claims abstract description 29
- 238000013022 venting Methods 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 230000008867 communication pathway Effects 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 description 23
- 239000002828 fuel tank Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
- F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
- F02M41/1411—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis characterised by means for varying fuel delivery or injection timing
- F02M41/1416—Devices specially adapted for angular adjustment of annular cam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/16—Adjustment of injection timing
- F02D1/18—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse
- F02D1/183—Adjustment of injection timing with non-mechanical means for transmitting control impulse; with amplification of control impulse hydraulic
-
- 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
Definitions
- the present invention relates to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
- a conventional rotary fuel pump 1 includes a cam ring 3 which is angularly adjustable with respect to a pump housing 5.
- a rotor 7 comprising a distributor member 9 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown).
- the cam ring 3 includes a plurality of cam lobes 11 and encircles part of the distributor member 9, including pumping plungers 13 which are slidable within respective bores 15 of the distributor member 9.
- Each of the pumping plungers 13 has an associated shoe 17 and roller 19 arrangement, the rollers 19 of which are engagable with the cam surface of the cam ring 3.
- the cam ring 3 is housed in a cam box 21 defined within the pump housing 5.
- transfer pressure a force due to fuel pressure within the bores 15 serves to urge the plungers 13 in a radially outward direction.
- the output pressure of the transfer pump 16 (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used.
- Rotation of the distributor member 9 relative to the cam ring 3 causes the rollers 19 to move relative to the cam ring 3, engagement between the rollers 19 and the cam lobes 11 thereby causing the plungers 13 to be forced in a radially inward direction to pressurise fuel within the respective bore 15 and causing fuel to be delivered by the pump 1 at relatively high pressure.
- the timing at which fuel is delivered by the pump 1 can be adjusted.
- the advance arrangement 23 includes a servo piston arrangement which is arranged to influence the degree of timing advance depending on the operating speed of the engine (referred to as “speed advance”), a light load piston arrangement, including a load sensing piston, which is arranged to influence the degree of timing advance depending on the load under which the engine is operating (referred to as “light load advance”) and a temperature control valve which is arranged to influence the degree of timing advance depending on the operating temperature of the engine (referred to as "cold advance").
- the cam ring 3 is provided with a cam ball screw 25 which extends into an opening provided in an advance piston in order to permit adjustment of the angular position of the cam ring.
- the advance piston is slidable within a further bore provided in an advance box housing 27. The ends of the bore are closed by first and second end plates respectively which are secured to the advance box housing 27 by means of bolts 29. Appropriate O-rings may be used to seal the end plates to the advance box housing 27.
- the advance piston is responsive to fuel pressure changes within an advance piston control chamber (the main advance control chamber). If the pressure in the main advance control chamber increases, the advance piston is caused to move in a first direction so as to advance the timing of fuel delivery. If the pressure in the main advance control chamber is reduced, the advance piston is caused to move in an opposite direction to retard the timing of fuel delivery.
- the present invention sets out to help ameliorate or overcome at least some of the problems associated with prior art systems.
- aspects of the present invention relate to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
- the present invention relates to a rotary fuel pump comprising:
- the first vent line allows air to vent from the fuel supplied to the advance arrangement, thereby reducing the introduction of air to the advance arrangement.
- the operation of the advance arrangement, including an advance piston, can be controlled even when air is present in the speed dependent fuel pressure line.
- the first vent line can be provided between a pump for supplying the speed dependent fuel pressure and the advance arrangement.
- the first vent line can be in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line.
- the collection chamber can be an annular chamber extending around the rotor.
- the annular chamber can be maintained in fluid communication with the first vent line.
- An aperture could be formed in a housing supporting the rotor to form the annular chamber.
- the annular chamber can comprise an annular groove formed in the rotor.
- a second vent line can be provided for venting air from the collection chamber.
- the second vent line can be in fluid communication with a drain or a reservoir.
- the second vent line can be in fluid communication with the cambox.
- the second vent line could be formed in a pump housing.
- the second vent line can comprise an aperture formed in the rotor.
- the aperture could be an axial recess or bore formed in the rotor.
- the aperture can be a spiral or helical groove formed in the rotor. The helical groove can be turned in the same direction as the rotational direction of the rotor; or in the opposite direction to the rotational direction of the rotor.
- the second vent line can have a relatively small cross-sectional area to define a viscous leak path for inhibiting the flow of fuel from the collection chamber to the cam box.
- the first vent line can have a larger cross-sectional area than the second vent line.
- the first vent line can comprise an inlet and an outlet.
- the inlet can be positioned at an operative high point of the speed dependent fuel pressure line. This arrangement can promote the venting of air from the speed dependent pressure line.
- the rotary fuel pump can further comprise one or more plungers actuatable by the cam arrangement.
- the cam arrangement is arranged to cooperate, in use, with an advance piston provided in an advance arrangement.
- the present invention also relates to a rotary fuel pump as described herein in combination with an advance arrangement.
- the advance arrangement can comprise an advance piston which is slidable within a first bore and which cooperates, in use, with the cam arrangement of the fuel pump to adjust the timing of fuel delivery by the pump.
- the present invention relates to an advance arrangement for use in controlling timing of fuel delivery by a fuel pump for use in an engine
- an advance piston which is slidable within a first bore and which cooperates, in use, with a cam arrangement of a fuel pump to adjust the timing of fuel delivery by the pump, the advance piston being slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery;
- a speed dependent fuel pressure line being provided for supplying speed dependent fuel pressure to a first control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed; wherein a first vent line is provided for venting air from the speed dependent fuel pressure line.
- the first vent line can be in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line.
- a second vent line can be provided for venting air from the collection chamber.
- the present invention relates to a rotor for a rotary fuel pump, the rotor comprising a head portion and a body portion, wherein at least one aperture is formed in the head portion for providing a fluid communication pathway.
- the at least one aperture can provide a communication pathway from a first side of the head portion to a second side of the head portion.
- the at least one aperture can be a helical recess formed in an outer surface of the head portion.
- An annular groove can be formed in the body portion to form a collection chamber.
- a rotary fuel pump 101 in accordance with an embodiment of the present invention will now be described with reference to Figure 2 .
- the rotary fuel pump 101 is a modified version of for storing air vented from the transfer pressure supply line 127 the prior art fuel pump 1 illustrated in Figure 1 .
- the rotary fuel pump 101 comprises a cam ring 103 which is angularly adjustable with respect to a pump housing 105.
- a hydraulic head rotor 107 comprising a distributor member 109 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown).
- the hydraulic head rotor 107 comprises a head portion 107a and a body portion 107b which is supported in a hydraulic head sleeve 111 located in the pump housing 105.
- the cam ring 103 includes a plurality of cam lobes 113 and encircles part of the distributor member 109, including pumping plungers 115 which are slidable within respective bores 117 of the distributor member 109.
- Each of the pumping plungers 115 has an associated shoe 119 and roller 121 arrangement, the rollers 121 of which are engageable with the cam surface of the cam ring 103.
- the cam ring 103 is housed in a cam box 123 defined within the pump housing 105.
- An advance arrangement 125 is provided for controlling speed advance, light load advance and cold advance.
- the advance arrangement 125 comprises an advance piston (not shown) provided in an advance box housing 127.
- the advance piston is coupled to the cam ring 103 by a cam ball screw 128.
- the advance piston is slidable within a bore (extending along an axis X extending perpendicular to the plane of the page in Figure 2 ) to alter the angular position of the cam ring 103.
- the advance piston is slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery.
- a transfer pump 130 is provided for supplying fuel to the distributor member 109 and the advance arrangement 125.
- the output pressure of the transfer pump (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used. Thus, the output pressure of the transfer pump is speed dependent.
- An inlet metering valve 127 supplies a metered volume of fuel to the distributor member 109.
- the transfer pump 130 is in fluid communication with an annular groove for supplying fuel to the inlet metering valve 127 via a top pressure supply line 132 and an electric shut-off solenoid chamber.
- a transfer pressure supply line 129 is provided for supplying fuel from the transfer pump 130 to the advance arrangement 125. The transfer pressure supply line 129 is not in communication with the inlet metering valve 127.
- the transfer pump supplies fuel to a main control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed.
- a suitable mechanism for controlling operation of the advance piston is known from US patent number US 7,350,508 (Delphi Technologies, Inc.) which is incorporated herein in its entirety by reference. It will be appreciated that the present invention is not limited to this particular control mechanism and can be used with other advance arrangements.
- a venting bore 131 having an inlet 133 and an outlet 135 is provided to vent air from the transfer pressure supply line 127.
- the venting bore 131 extends through the hydraulic head sleeve 111 and forms a first communication pathway extending from the transfer pressure supply line 129 to a collection chamber 137 for storing air vented from the transfer pressure supply line 129.
- the inlet 133 is provided at a relatively high point of the transfer pressure supply line 129 to promote the flow of air from the transfer pressure supply line 129; and the outlet 135 is open to the collection chamber 137.
- an annular groove 139 is formed in the body portion 107b of the rotor 107 to form the collection chamber 137. In use, rather than a large volume of air being swept into the advance arrangement 125, the air will rise upwards into the collection chamber 137 via the venting bore 131.
- a helical groove 141 is formed in an outer surface of the head portion 107a of the rotor 107 to form a second communication pathway extending from the collection chamber 137 to the cam box 123.
- the helical groove 141 has a shallow, narrow profile and leads to an 'anti-seizure' groove provided at the front of the rotor 107 just behind the head portion 107a of the rotor 107 within the cam box 123.
- the annular groove 139 is relatively large in comparison to the helical groove 141. The air collected in the annular groove 139 can be ejected along the helical groove 141 under the influence of the large pressure difference between the transfer pressure in the collection chamber 137 and the pressure in the cam box 123 in front of the rotor 107.
- the helical groove 141 is dimensioned so as to define a viscous leak path suitable for minimizing the flow of fuel from the transfer pressure supply line 129 to the cam box 123.
- the loss of transfer pressure to the cam box 123 when there is no air in the collection chamber 137 is thereby reduced.
- Forming the communication pathway from the collection chamber 137 to the cam box 123 in the form of a helical groove 141 serves several purposes, including:
- At least one additional communication pathway (not shown) is provided for venting air from the cam box 123.
- a back-leakage connection from the cam box 123 to the fuel tank (not shown) is used to vent the air from the cam box 123 and return it to the fuel tank.
- the pump 101 operates in substantially the same way as the prior art pump 1 illustrated in Figure 1 .
- the transfer pump supplies a volume of air to the advance arrangement 125
- at least some of the air can be vented from the transfer pressure supply line 127 via the venting bore 131.
- the air is collected in the collection chamber 137 and gradually vented to the cam box 123 via the helical groove 141. Thereafter, the air can be vented to atmosphere from the cam box 123.
- the risk of a relatively large volume of air being introduced into the advance arrangement 125 is reduced, thereby protecting the advance piston from damage.
Abstract
Description
- The present invention relates to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
- As shown in
Figure 1 , a conventional rotary fuel pump 1 includes acam ring 3 which is angularly adjustable with respect to a pump housing 5. Arotor 7 comprising adistributor member 9 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown). Thecam ring 3 includes a plurality ofcam lobes 11 and encircles part of thedistributor member 9, includingpumping plungers 13 which are slidable withinrespective bores 15 of thedistributor member 9. Each of thepumping plungers 13 has an associatedshoe 17 androller 19 arrangement, therollers 19 of which are engagable with the cam surface of thecam ring 3. Thecam ring 3 is housed in acam box 21 defined within the pump housing 5. - In use, fuel is supplied to the
bores 15 of thedistributor member 9 by atransfer pump 16 and a force due to fuel pressure within thebores 15 serves to urge theplungers 13 in a radially outward direction. The output pressure of the transfer pump 16 (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used. Rotation of thedistributor member 9 relative to thecam ring 3 causes therollers 19 to move relative to thecam ring 3, engagement between therollers 19 and thecam lobes 11 thereby causing theplungers 13 to be forced in a radially inward direction to pressurise fuel within therespective bore 15 and causing fuel to be delivered by the pump 1 at relatively high pressure. By altering the angular position of thecam ring 3 by means of anadvance arrangement 23, the timing at which fuel is delivered by the pump 1 can be adjusted. - The
advance arrangement 23 includes a servo piston arrangement which is arranged to influence the degree of timing advance depending on the operating speed of the engine (referred to as "speed advance"), a light load piston arrangement, including a load sensing piston, which is arranged to influence the degree of timing advance depending on the load under which the engine is operating (referred to as "light load advance") and a temperature control valve which is arranged to influence the degree of timing advance depending on the operating temperature of the engine (referred to as "cold advance"). - The
cam ring 3 is provided with acam ball screw 25 which extends into an opening provided in an advance piston in order to permit adjustment of the angular position of the cam ring. The advance piston is slidable within a further bore provided in anadvance box housing 27. The ends of the bore are closed by first and second end plates respectively which are secured to theadvance box housing 27 by means ofbolts 29. Appropriate O-rings may be used to seal the end plates to theadvance box housing 27. - The advance piston is responsive to fuel pressure changes within an advance piston control chamber (the main advance control chamber). If the pressure in the main advance control chamber increases, the advance piston is caused to move in a first direction so as to advance the timing of fuel delivery. If the pressure in the main advance control chamber is reduced, the advance piston is caused to move in an opposite direction to retard the timing of fuel delivery.
- Current rotary pumps are designed to be robust to ingestion of a small amount of air continuously. However, in certain operational circumstances, such as when a fuel filter is changed or the vehicle runs out of fuel, a large volume of air can be introduced into the system. If the volume of air is not removed by priming the system, the lack of fuel in the advance arrangement can result in loss of control over the advance piston and, therefore, the movement of the cam ring. Specifically, if a large volume of air is swept into the pump and is followed by fuel, before the engine can stall, then some of the air can be swept into the advance arrangement. Until the air is ejected from the advance arrangement, the advance piston can reciprocate back and forth rapidly between the end stops. The resulting blows to the advance arrangement can be severe and could potentially cause damage, permanent loss of correct advance functionality and pump leakage.
- The present invention sets out to help ameliorate or overcome at least some of the problems associated with prior art systems.
- Aspects of the present invention relate to a rotary fuel pump; an advance arrangement for a rotary fuel pump; and a rotor for a rotary fuel pump.
- In a further aspect, the present invention relates to a rotary fuel pump comprising:
- a rotor having at least one pumping element for supplying high pressure fuel ;
- a cam box containing a cam arrangement for actuating the at least one pumping element; and
- a speed dependent fuel pressure line for supplying speed dependent fuel pressure to an advance arrangement for adjusting the timing of fuel delivery by the pump;
- wherein a first vent line is provided for venting air from the speed dependent fuel pressure line.
- The first vent line allows air to vent from the fuel supplied to the advance arrangement, thereby reducing the introduction of air to the advance arrangement. The operation of the advance arrangement, including an advance piston, can be controlled even when air is present in the speed dependent fuel pressure line. The first vent line can be provided between a pump for supplying the speed dependent fuel pressure and the advance arrangement.
- The first vent line can be in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line. The collection chamber can be an annular chamber extending around the rotor. The annular chamber can be maintained in fluid communication with the first vent line. An aperture could be formed in a housing supporting the rotor to form the annular chamber. Alternatively, the annular chamber can comprise an annular groove formed in the rotor.
- A second vent line can be provided for venting air from the collection chamber. The second vent line can be in fluid communication with a drain or a reservoir. Alternatively, the second vent line can be in fluid communication with the cambox.
- The second vent line could be formed in a pump housing. Alternatively, the second vent line can comprise an aperture formed in the rotor. The aperture could be an axial recess or bore formed in the rotor. Alternatively, the aperture can be a spiral or helical groove formed in the rotor. The helical groove can be turned in the same direction as the rotational direction of the rotor; or in the opposite direction to the rotational direction of the rotor.
- The second vent line can have a relatively small cross-sectional area to define a viscous leak path for inhibiting the flow of fuel from the collection chamber to the cam box. The first vent line can have a larger cross-sectional area than the second vent line.
- The first vent line can comprise an inlet and an outlet. The inlet can be positioned at an operative high point of the speed dependent fuel pressure line. This arrangement can promote the venting of air from the speed dependent pressure line.
- The rotary fuel pump can further comprise one or more plungers actuatable by the cam arrangement. The cam arrangement is arranged to cooperate, in use, with an advance piston provided in an advance arrangement.
- The present invention also relates to a rotary fuel pump as described herein in combination with an advance arrangement. The advance arrangement can comprise an advance piston which is slidable within a first bore and which cooperates, in use, with the cam arrangement of the fuel pump to adjust the timing of fuel delivery by the pump.
- In a further aspect, the present invention relates to an advance arrangement for use in controlling timing of fuel delivery by a fuel pump for use in an engine comprising;
an advance piston which is slidable within a first bore and which cooperates, in use, with a cam arrangement of a fuel pump to adjust the timing of fuel delivery by
the pump, the advance piston being slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery;
a speed dependent fuel pressure line being provided for supplying speed dependent fuel pressure to a first control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed;
wherein a first vent line is provided for venting air from the speed dependent fuel pressure line. - The first vent line can be in fluid communication with a collection chamber for collecting air vented from the speed dependent fuel pressure line. A second vent line can be provided for venting air from the collection chamber.
- In a still further aspect, the present invention relates to a rotor for a rotary fuel pump, the rotor comprising a head portion and a body portion, wherein at least one aperture is formed in the head portion for providing a fluid communication pathway. The at least one aperture can provide a communication pathway from a first side of the head portion to a second side of the head portion. The at least one aperture can be a helical recess formed in an outer surface of the head portion. An annular groove can be formed in the body portion to form a collection chamber.
- An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying figures, in which:
-
Figure 1 shows a cross-sectional view of a prior art rotary pump; -
Figure 2 shows a cross-sectional view of a rotary pump according to an embodiment of the present invention; and -
Figure 3 shows an enlarged view of a region A of the cross-sectional view shown inFigure 2 . - A
rotary fuel pump 101 in accordance with an embodiment of the present invention will now be described with reference toFigure 2 . Therotary fuel pump 101 is a modified version of for storing air vented from the transferpressure supply line 127 the prior art fuel pump 1 illustrated inFigure 1 . - The
rotary fuel pump 101 comprises acam ring 103 which is angularly adjustable with respect to apump housing 105. Ahydraulic head rotor 107 comprising adistributor member 109 is provided for supplying metered volumes of high pressure fuel to fuel injectors (not shown). Thehydraulic head rotor 107 comprises ahead portion 107a and abody portion 107b which is supported in ahydraulic head sleeve 111 located in thepump housing 105. Thecam ring 103 includes a plurality ofcam lobes 113 and encircles part of thedistributor member 109, including pumpingplungers 115 which are slidable withinrespective bores 117 of thedistributor member 109. Each of the pumpingplungers 115 has an associatedshoe 119 androller 121 arrangement, therollers 121 of which are engageable with the cam surface of thecam ring 103. Thecam ring 103 is housed in acam box 123 defined within thepump housing 105. - An
advance arrangement 125 is provided for controlling speed advance, light load advance and cold advance. Theadvance arrangement 125 comprises an advance piston (not shown) provided in anadvance box housing 127. The advance piston is coupled to thecam ring 103 by acam ball screw 128. The advance piston is slidable within a bore (extending along an axis X extending perpendicular to the plane of the page inFigure 2 ) to alter the angular position of thecam ring 103. The advance piston is slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery. - A
transfer pump 130 is provided for supplying fuel to thedistributor member 109 and theadvance arrangement 125. The output pressure of the transfer pump (referred to as "transfer pressure") is controlled so as to be related to the speed of operation of the engine with which the pump 1 is being used. Thus, the output pressure of the transfer pump is speed dependent. Aninlet metering valve 127 supplies a metered volume of fuel to thedistributor member 109. Thetransfer pump 130 is in fluid communication with an annular groove for supplying fuel to theinlet metering valve 127 via a toppressure supply line 132 and an electric shut-off solenoid chamber. A transferpressure supply line 129 is provided for supplying fuel from thetransfer pump 130 to theadvance arrangement 125. The transferpressure supply line 129 is not in communication with theinlet metering valve 127. - The transfer pump supplies fuel to a main control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed. A suitable mechanism for controlling operation of the advance piston is known from US patent number
US 7,350,508 (Delphi Technologies, Inc.) which is incorporated herein in its entirety by reference. It will be appreciated that the present invention is not limited to this particular control mechanism and can be used with other advance arrangements. - As shown most clearly in
Figure 3 , a ventingbore 131 having aninlet 133 and anoutlet 135 is provided to vent air from the transferpressure supply line 127. The venting bore 131 extends through thehydraulic head sleeve 111 and forms a first communication pathway extending from the transferpressure supply line 129 to acollection chamber 137 for storing air vented from the transferpressure supply line 129. Theinlet 133 is provided at a relatively high point of the transferpressure supply line 129 to promote the flow of air from the transferpressure supply line 129; and theoutlet 135 is open to thecollection chamber 137. In the present embodiment, anannular groove 139 is formed in thebody portion 107b of therotor 107 to form thecollection chamber 137. In use, rather than a large volume of air being swept into theadvance arrangement 125, the air will rise upwards into thecollection chamber 137 via the venting bore 131. - A
helical groove 141 is formed in an outer surface of thehead portion 107a of therotor 107 to form a second communication pathway extending from thecollection chamber 137 to thecam box 123. Thehelical groove 141 has a shallow, narrow profile and leads to an 'anti-seizure' groove provided at the front of therotor 107 just behind thehead portion 107a of therotor 107 within thecam box 123. Theannular groove 139 is relatively large in comparison to thehelical groove 141. The air collected in theannular groove 139 can be ejected along thehelical groove 141 under the influence of the large pressure difference between the transfer pressure in thecollection chamber 137 and the pressure in thecam box 123 in front of therotor 107. - The
helical groove 141 is dimensioned so as to define a viscous leak path suitable for minimizing the flow of fuel from the transferpressure supply line 129 to thecam box 123. The loss of transfer pressure to thecam box 123 when there is no air in thecollection chamber 137 is thereby reduced. Forming the communication pathway from thecollection chamber 137 to thecam box 123 in the form of ahelical groove 141 serves several purposes, including: - (a) The
helical groove 141 provides a long viscous leak path that will allow air to escape relatively easily but creates a strong resistance to the flow of fuel (so air vents preferentially over fuel). - (b) The
helical groove 141 can be machined in an outer surface of therotor 107 using normal manufacturing methods and tolerances without interrupting the cutting, grinding and honing processes. - (c) Forming the
helical groove 141 so as to turn in the same direction as the rotational direction of the pump 101 (i.e. clockwise for a clockwise rotation pump; and anticlockwise for an anticlockwise pump) potentially allows thehelical groove 141 to act as a weak pump that will tend to assist fuel to pass along the helical towards thecam box 123, but oppose the flow from thecam box 123 towards thecollection chamber 137. (In the illustrated arrangement, therotor 107 rotates in an anticlockwise direction.) - (d) The
helical groove 141 allows improved support for a rotor bearing. - At least one additional communication pathway (not shown) is provided for venting air from the
cam box 123. In the present embodiment, a back-leakage connection from thecam box 123 to the fuel tank (not shown) is used to vent the air from thecam box 123 and return it to the fuel tank. - In use, the
pump 101 operates in substantially the same way as the prior art pump 1 illustrated inFigure 1 . However, in the event that the transfer pump supplies a volume of air to theadvance arrangement 125, at least some of the air can be vented from the transferpressure supply line 127 via the venting bore 131. The air is collected in thecollection chamber 137 and gradually vented to thecam box 123 via thehelical groove 141. Thereafter, the air can be vented to atmosphere from thecam box 123. The risk of a relatively large volume of air being introduced into theadvance arrangement 125 is reduced, thereby protecting the advance piston from damage. - It will be appreciated that various changes and modifications can be made to the embodiment described herein without departing from the scope of the present invention.
Claims (15)
- A rotary fuel pump (101) comprising:a rotor (107) having at least one pumping element (115) for supplying high pressure fuel;a cam box (123) containing a cam arrangement (103) for actuating the at least one pumping element (115); anda speed dependent fuel pressure line (129) for supplying speed dependent fuel pressure to an advance arrangement (125) for adjusting the timing of fuel delivery by the pump (101);wherein a first vent line (131) is provided for venting air from the speed dependent fuel pressure line (129).
- A rotary fuel pump (101) as claimed in claim 1, wherein the first vent line (131) is in fluid communication with a collection chamber (137) for collecting air vented from the speed dependent fuel pressure line (129).
- A rotary fuel pump (101) as claimed in claim 2, wherein the collection chamber (137) is an annular chamber extending around said rotor (107).
- A rotary fuel pump (101) as claimed in claim 3, wherein said annular chamber (137) comprises an annular groove (139) formed in said rotor (107).
- A rotary fuel pump (101) as claimed in any one of the preceding claims, wherein the first vent line (131) is provided between a pump for supplying the speed dependent fuel pressure and the advance arrangement.
- A rotary fuel pump (101) as claimed in any one of the preceding claims further comprising a second vent line (141) for venting air from the collection chamber (137).
- A rotary fuel pump (101) as claimed in claim 6, wherein the second vent line (141) is in fluid communication with the cambox (123).
- A rotary fuel pump (101) as claimed in claim 6 or claim 7, wherein the second vent line (141) comprises an aperture formed in said rotor (107).
- A rotary fuel pump (101) as claimed in claim 8, wherein said aperture is a helical groove (141) formed in said rotor (107).
- A rotary fuel pump (101) as claimed in claim 9, wherein said helical groove (141) is turned in the same direction as the rotational direction of the rotor (107).
- A rotary fuel pump (101) as claimed in any one of the preceding claims, wherein the first vent line (131) comprises an inlet (133) and an outlet (135), the inlet (133) being positioned at an operative high point of the speed dependent fuel pressure line (129).
- An advance arrangement (125) for use in controlling timing of fuel delivery by a fuel pump (101) for use in an engine comprising;
an advance piston which is slidable within a first bore and which cooperates, in use, with a cam arrangement (103) of a fuel pump (101) to adjust the timing of fuel delivery by the pump (101), the advance piston being slidable within the bore in either an advance or a retard direction to advance or retard, respectively, the timing of the fuel pump delivery;
a speed dependent fuel pressure line (129) being provided for supplying speed dependent fuel pressure to a first control chamber for controlling the position of the advance piston in response to variations in the speed dependent fuel pressure to permit adjustment of the timing in response to engine speed;
wherein a first vent line (131) is provided for venting air from the speed dependent fuel pressure line (129). - An advance arrangement as claimed in claim 12, wherein the first vent line (131) is in fluid communication with a collection chamber (137) for collecting air vented from the speed dependent fuel pressure line (129).
- An advance arrangement as claimed in claim 12 or claim 13 further comprising a second vent line (141) for venting air from the collection chamber (137).
- A rotor (107) for a rotary fuel pump (101), the rotor comprising a head portion (1 07a) and a body portion (1 07b), wherein at least one aperture (141) is formed in the head portion (107a) to provide a fluid communication pathway.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12166297.7A EP2660456B1 (en) | 2012-05-01 | 2012-05-01 | Fuel pump |
CN201380022963.5A CN104619980B (en) | 2012-05-01 | 2013-04-17 | A kind of swirling fuel pump and the rotor and pump case for it |
PCT/EP2013/058012 WO2013164195A1 (en) | 2012-05-01 | 2013-04-17 | Fuel pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12166297.7A EP2660456B1 (en) | 2012-05-01 | 2012-05-01 | Fuel pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2660456A1 true EP2660456A1 (en) | 2013-11-06 |
EP2660456B1 EP2660456B1 (en) | 2017-12-06 |
Family
ID=48142773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12166297.7A Active EP2660456B1 (en) | 2012-05-01 | 2012-05-01 | Fuel pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2660456B1 (en) |
CN (1) | CN104619980B (en) |
WO (1) | WO2013164195A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1109020A (en) * | 1965-11-01 | 1968-04-10 | Roosa Vernon D | Fuel injection pump assemblies for internal combustion engines |
US3486492A (en) * | 1967-11-07 | 1969-12-30 | Allis Chalmers Mfg Co | Timing advance mechanism |
EP0039304A1 (en) * | 1980-04-28 | 1981-11-04 | Stanadyne Inc. | Apparatus for adjusting the timing of a fuel injection pump |
US4381182A (en) * | 1979-07-27 | 1983-04-26 | Lucas Industries Limited | Fuel injection pump |
EP0303237A2 (en) * | 1987-08-10 | 1989-02-15 | Nippondenso Co., Ltd. | Inner-cam type distribution fuel injection pump |
EP0859137A1 (en) * | 1997-02-14 | 1998-08-19 | Lucas Industries Public Limited Company | Advance arrangement for a high pressure fuel pump |
US7350508B1 (en) | 2006-10-12 | 2008-04-01 | Delphi Technologies, Inc. | Advance arrangements |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5688110A (en) * | 1995-06-02 | 1997-11-18 | Stanadyne Automotive Corp. | Fuel pump arrangement having cam driven low and high pressure reciprocating plunger pump units |
EP1454055B1 (en) * | 2001-12-01 | 2005-11-02 | Robert Bosch Gmbh | Radial piston pump having force-feed lubrication |
-
2012
- 2012-05-01 EP EP12166297.7A patent/EP2660456B1/en active Active
-
2013
- 2013-04-17 WO PCT/EP2013/058012 patent/WO2013164195A1/en active Application Filing
- 2013-04-17 CN CN201380022963.5A patent/CN104619980B/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1109020A (en) * | 1965-11-01 | 1968-04-10 | Roosa Vernon D | Fuel injection pump assemblies for internal combustion engines |
US3486492A (en) * | 1967-11-07 | 1969-12-30 | Allis Chalmers Mfg Co | Timing advance mechanism |
US4381182A (en) * | 1979-07-27 | 1983-04-26 | Lucas Industries Limited | Fuel injection pump |
EP0039304A1 (en) * | 1980-04-28 | 1981-11-04 | Stanadyne Inc. | Apparatus for adjusting the timing of a fuel injection pump |
EP0303237A2 (en) * | 1987-08-10 | 1989-02-15 | Nippondenso Co., Ltd. | Inner-cam type distribution fuel injection pump |
EP0859137A1 (en) * | 1997-02-14 | 1998-08-19 | Lucas Industries Public Limited Company | Advance arrangement for a high pressure fuel pump |
US7350508B1 (en) | 2006-10-12 | 2008-04-01 | Delphi Technologies, Inc. | Advance arrangements |
Also Published As
Publication number | Publication date |
---|---|
WO2013164195A1 (en) | 2013-11-07 |
CN104619980A (en) | 2015-05-13 |
CN104619980B (en) | 2017-07-21 |
EP2660456B1 (en) | 2017-12-06 |
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