EP1767771B1 - High-pressure fuel supply pump - Google Patents
High-pressure fuel supply pump Download PDFInfo
- Publication number
- EP1767771B1 EP1767771B1 EP20060121057 EP06121057A EP1767771B1 EP 1767771 B1 EP1767771 B1 EP 1767771B1 EP 20060121057 EP20060121057 EP 20060121057 EP 06121057 A EP06121057 A EP 06121057A EP 1767771 B1 EP1767771 B1 EP 1767771B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- camshaft
- supply pump
- fuel supply
- pressure fuel
- 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.)
- Expired - Fee Related
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- 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
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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
- F02M59/02—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
- F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
- F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
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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
- F02M59/02—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
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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
- F02M59/16—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps characterised by having multi-stage compression of fuel
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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
- F02M59/44—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
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- 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
- F04B1/0413—Cams
Definitions
- the present invention relates to a high-pressure fuel supply pump according to the preamble of claim 1, that pressurizes fuel by reciprocating a plunger with rotation of a cam provided on a camshaft.
- the present invention is suitably applied to a high-pressure fuel supply pump of a common rail (high-pressure fuel accumulation pipe) fuel injection device of a diesel engine.
- a common rail fuel injection device of a diesel engine draws fuel from a fuel tank with a feed pump and pressurizes the drawn fuel with a high-pressure fuel supply pump.
- the fuel injection device pressure-feeds the high-pressure fuel into a common rail with the high-pressure fuel supply pump.
- the high-pressure fuel pressure-fed into the common rail is injected into a cylinder of the engine from an injector.
- a known high-pressure fuel supply pump is structured such that the central axis of the cam is deviated from the central axis of the camshaft as described in JP-A-2002-310039 , for example.
- the fuel supply pump reciprocates a plunger with the use of a cam ring revolving in accordance with rotation of the cam.
- JP-A-2002-310039 describes a technology for reducing abrasion or seizing of the cam and the cam ring by forming a concave portion on an outer peripheral wall of the cam in an area, to which a reaction force of the fuel pressure-feeding operation of the plunger is not applied, for introducing a lubricating fluid (fuel) in the cam chamber to a space between the cam and the cam ring.
- the camshaft as a component of the high-pressure fuel supply pump has sliding faces that are provided on both sides of the cam and slide on bearing metals attached to a housing. Problems such as abrasion or seizing of the sliding faces of the camshaft can be caused by an increase in a bearing stress at the sliding faces.
- DE 102 08 574 A shows a radial piston pump for a fuel injection device, which comprises a camshaft including a cam with its center being deviated from the rotational center of the camshaft for reciprocating a plunger in order to pressurize fuel.
- a camshaft including a cam with its center being deviated from the rotational center of the camshaft for reciprocating a plunger in order to pressurize fuel.
- One end of the camshaft as well as the cam is supported by a bush bearing.
- continuous grooves are formed between the bearings and the cam and/or the camshaft.
- a high-pressure fuel supply pump has a camshaft, a cam, a housing and a plunger.
- the cam is provided on the camshaft such that a central axis of the cam is deviated from a central axis of the camshaft.
- the cam rotates with the camshaft.
- the housing is formed with a cam chamber for accommodating the camshaft and with a fuel pressurization chamber for pressurizing fuel.
- the plunger reciprocates due to the rotation of the cam to pressurize and to pressure-feed the fuel suctioned into the fuel pressurization chamber.
- the camshaft is rotatably held by a bearing formed in the housing at sliding faces formed on the camshaft on both sides of the cam.
- the fuel supply pump is formed with a lubricating passage for introducing the fuel in the cam chamber into a space between at least one of the sliding faces and the bearing.
- the lubricating passage has two ends such that one of the two ends on the cam side communicates with the cam chamber and the other one of the two end is blocked.
- the fuel in the cam chamber as a lubricating fluid can be introduced into the space between the sliding face of the camshaft and the bearing through the lubricating passage.
- friction between the sliding face of the camshaft and the bearing is reduced, and abrasion or seizing can be inhibited.
- a common rail fuel injection system of a vehicular diesel engine 1 having a high-pressure fuel supply pump 4 according to a first example embodiment of the present invention is illustrated.
- the four-cylinder engine 1 has injectors 2 mounted to respective cylinders. Each injector 2 injects fuel when the injector 2 opens.
- the fuel is supplied from a common rail 3, which is common to the cylinders, to the injectors 2.
- the high-pressure fuel supply pump 4 pressurizes the fuel drawn from a fuel tank 5 to high pressure and supplies the fuel to the common rail 3.
- the common rail 3 accumulates and stores the high-pressure fuel.
- the fuel pressure in the common rail 3 defines injection pressure of the injectors 2.
- An electronic control unit (ECU) 6 as a controller of the high-pressure fuel supply pump 4 controls the high-pressure fuel supply pump 4 to regulate the fuel pressure in the common rail 3.
- the ECU 6 controls various parts of the engine 1 such as the injectors 2 or the high-pressure fuel supply pump 4.
- the ECU 6 reads in output signals of sensors attached to the various parts of the engine 1 for sensing operation states of the engine 1.
- a pressure sensor 7 for sensing the pressure in the common rail 3 is attached to the common rail 3.
- a rotation speed sensor 8 as a rotation cycle sensor is provided for sensing rotation of a crankshaft that outputs power of the engine 1.
- the ECU 6 maintains suitable operation of the engine 1 by controlling the injectors 2 and the high-pressure fuel supply pump 4 based on the signals of the sensors 7, 8 and the like.
- Fig. 2 is a longitudinal sectional view showing the high-pressure fuel supply pump 4 according to the present embodiment.
- Fig. 3 is a sectional view showing the high-pressure fuel supply pump 4 of Fig. 2 taken along the line III-III.
- a camshaft 11 is rotated by the engine 1.
- the camshaft 11 is accommodated in two housings 12 made of an aluminum and cylinder blocks 20 as housings.
- the camshaft 11 is held by bearing metals as bearings 13 provided in the two housings 12 at sliding faces 11 a such that the camshaft 11 can rotate in a sliding manner.
- a cam 14 has a circular profile and is integrally formed with the camshaft 11. The center of the cam 14 is deviated from the rotation center of the camshaft 11.
- the cam 14 slidably contacts a cam bush 16, which is fitted into a cam ring 15, at a cam sliding face 14a.
- the cam 14 rotates around the rotation central axis of the camshaft 11.
- the two sliding faces 11 a are formed on the camshaft 11 on both sides of the cam 14.
- the cam ring 15 does not rotate but evolves around the rotation central axis of the camshaft 11 due to the rotation of the cam 14.
- a trochoid feed pump 17 is driven by the camshaft 11.
- the feed pump 17 draws the fuel from the fuel tank 5 and pressure-feeds the fuel to a suction metering valve (not shown).
- the feed pump 17 is incorporated in the high-pressure fuel supply pump 4.
- the feed pump 17 communicates with a cam chamber 27 surrounded and formed by the two housings 12 and the two cylinder blocks 20, a clearance between the two sliding faces 11 a of the camshaft 11 and the bearings 13 and a clearance between the cam sliding face 14a of the cam 14 and the cam bush 16 as a bearing.
- These clearances are invariably filled with the fuel so that the fuel exerts a lubricating effect as a lubricating fluid.
- An oil seal 18 prevents flowing out of the lubricating fluid supplied from the feed pump 17 to the clearance between the sliding faces 11a and the bearings 13.
- the cam 14 and the cam ring 15 rotate and revolve in the cam chamber 27.
- the plunger 19 reciprocates in a cylinder 20a formed in the iron cylinder block 20 defining the housing.
- the cam ring 15 pushes up the plunger 19 through its revolving movement.
- a fuel pressurization chamber 21 is formed in the cylinder 20a.
- the fuel is suctioned from the feed pump 17 through the fuel metering valve and a fuel inlet passage 21 a and is pressurized in the fuel pressurization chamber 21 to high pressure through the reciprocation of the plunger 19.
- a fuel suction valve 23 has a check valve 23a. The check valve 23a prevents a backflow of the fuel into the fuel inlet passage 21 a when the fuel is pressurized in the fuel pressurization chamber 21.
- a fuel discharge passage 24 is connected to the fuel pressurization chamber 21.
- a fuel discharge valve 25 is provided downstream of the fuel discharge passage 24 with respect to the fuel flow.
- the fuel discharge valve 25 has a ball-shaped valve 25a, a tapered seat 25b, on which the valve 25a can be seated, and a spring 25c for biasing the valve 25a to the tapered seat 25b.
- the valve 25a is normally seated on the tapered seat 25b. If the pressure of the fuel entering from the fuel discharge passage 24 becomes equal to or higher than the fuel pressure in a fuel passage 26a, the valve 25a separates from the tapered seat 25b.
- the fuel flows through the fuel passage 26a of a connector 26 screwed to a connection hole 20b of the cylinder block 20 and flows into the common rail 3.
- the two fuel discharge valves 23 open in turn in each half rotation of the camshaft 11.
- a lubricating passage 11 b is formed on the sliding face 11 a of the camshaft 11 for introducing the lubricating fluid to the sliding face 11a.
- the lubricating passage 11 b is formed on the sliding face 11 a of the camshaft 11 in an area, to which a reaction force due to the fuel pressure-feeding operation of the plunger 19 is not applied. In this area, the clearance between the sliding face 11a and the bearing metal 13 is large. Accordingly, the lubricating fluid resides in the clearance, so the lubricating fluid can be held in the sliding passage 11 b.
- the area, to which the reaction force is not applied, will be explained in reference to Fig. 4 .
- the cam 14 rotates in accordance with the rotation of the camshaft 11.
- the cam function starts at a point E and ends at a rising point F as shown in Fig. 4 .
- There is a delay area C of the fuel pressure-feeding operation due to a delay in valve closing of the fuel suction valve 23 and the like.
- reaction force is not applied to an area A (approximately a half of the circumference of the camshaft 11) of the sliding face 11a of the camshaft 11 and an area B (approximately a half of the circumference of the cam 14) of the cam 14. Centers of the area A and the area B are slightly deviated from each other but the areas A, B approximately face each other.
- the lubricating passage 11 b is formed in the area A of the sliding face 11 a, to which the reaction force is not applied. Since the pressure applied to the sliding face 11 a by the bearing 13 is uneven, the lubricating passage 11 b should be preferably formed at the substantially center of the area A.
- the cam 14 rotates due to the rotation of the camshaft 11 and the cam ring 15 revolves due to the rotation of the cam 14.
- the cam ring 15 moves in a radial direction of the camshaft 11 due to the revolution of the cam ring 15 and pushes up the plunger 19.
- the check valve 23a of the fuel suction valve 23 closes and the fuel in the fuel pressurization chamber 21 is pressurized.
- the pressurized fuel flows into the fuel discharge passage 24. If the pressure of the pressurized fuel exceeds the fuel pressure in the fuel passage 26a, the fuel separates the valve 25a from the tapered seat 25b and is accumulated in the common rail 3 through the fuel passage 26a.
- the fuel accumulated in the common rail 3 is supplied to the injectors 2. If the camshaft 11 rotates further to enter an area, in which the cam 14 does not exert the cam function, the plunger 19 existing at the rising point due to the revolution of the cam ring 15 descends due to the biasing force of the spring 22 (toward the center of the camshaft 11), and the fuel is suctioned into the fuel pressurization chamber 21 through the fuel inlet passage 21 a and the check valve 23a. Thus, the cycle of one rotation of the camshaft 11 ends.
- the high-pressure fuel supply pump 4 of the present embodiment is a two-cylinder type. Therefore, the two plungers 19 pressurize and pressure-feed the fuel in turn in each half rotation of the camshaft 11.
- the cam 14 is formed integrally with the camshaft 11 at approximately the center of the camshaft 11.
- the camshaft 11 rotates in a direction shown by an arrow mark in Fig. 5(b) .
- the profile of the cam 14 is a circular shape.
- the central axis of the cam 14 is deviated from the rotation central axis of the camshaft 11 by a predetermined distance. Therefore, the cam 14 rotates around the rotation central axis of the camshaft 11.
- the diameters of the two sliding faces 11 a are smaller than the diameter of the cam 14.
- Manufacturing clearance grooves 11c are formed on the camshaft 11 on both sides of the cam 14.
- the manufacturing clearance grooves 11c are necessary for finish processing of the sliding faces 11a. Improvement (lowering) of surface roughness of the sliding faces 11a is necessary because of the function of the sliding faces 11 a. Therefore, grinding process of the sliding faces 11a is performed.
- a grindstone as a manufacturing tool has to be moved in a range wider than the entire width of the sliding face 11 a. In such a case, the grindstone contacts the end face of the cam 14.
- the manufacturing clearance groove 11c having a predetermined width is formed. With the manufacturing clearance groove 11c, the grinding process can be performed over the entire width of the sliding face 11a while averting the contact between the grindstone and the end face of the cam 14.
- the lubricating fluid is introduced to the lubricating passages 11 b formed on the two sliding faces 11a to reduce the friction between the sliding faces 11a and the bearings 13. Thus, abrasion and seizing can be inhibited. Since the lubricating passages 11 b are formed on both of the sliding faces 11a, the lubricating effect is exerted over the entire width of the sliding faces 11a. Thus, the present invention can be applied to a large capacity high-pressure fuel supply pump or a multi-cylinder high-pressure fuel supply pump.
- the lubricating passage 11 b extends at a slant with respect to the rotation central axis of the camshaft 11 as shown in Fig. 5(a) .
- inertia due to fluctuation in the rotation speed of the camshaft 11 is applied to the lubricating fluid in the lubricating passage 11 b.
- the rotation speed of the camshaft 11 fluctuates due to the fluctuation of the rotation speed of the engine 1.
- the lubricating fluid is forced to flow along the slanted lubricating passages 11 b. This is a screw effect.
- lubricating performance between the sliding faces 11a and the bearings 13 is further improved.
- Each lubricating passage 11 b is a concave portion (groove) having a section in the shape of a cornered character C.
- the concave portion 11b is formed through a milling process. Process for eliminating burrs is applied to the edge between the concave portion 11b and the sliding face 11 a. An end of the concave portion 11 b opens into and communicates with the manufacturing clearance groove 11c. The other end is blocked. It is because the state in which the circumference of the camshaft 11 is hermetically blocked by the oil seal 18 cannot be maintained if the other end is also opened.
- the lubricating passages 11 b are formed in the shape of the concave portions on the sliding faces 11a of the camshaft 11, the lubricating fluid can be surely held in the concave portions 11b. Thus, the friction can be further reduced. Since the ends of the concave portions 11 b open into and communicate with the manufacturing clearance grooves 11c, the lubricating fluid smoothly flows into the concave portions 11 b through the manufacturing clearance grooves 11 c. Thus, the friction can be further reduced.
- a camshaft 11 according to a second example embodiment of the present invention is shown in Fig. 6 .
- the camshaft 11 of the second example embodiment is formed with two concave portions 11 b extending along the same slant direction like the first example embodiment. Since the two concave portions 11 b are set at the same slant direction, the machining process of the two concave portions 11 b can be performed by moving the camshaft 11, which is placed as a processed object of the machining process, in only one direction perpendicular to the slant direction of the concave portions 11 b.
- the first and second example embodiments can shorten the processing time and reduce the manufacturing cost.
- the slant direction of the concave portions 11 b of the second example embodiment shown in Fig. 6 is different from that of the first example embodiment shown in Fig. 5 .
- the concave portions 11 b extend diagonally right down in Fig. 5(a) .
- the concave portions 11 b extend diagonally right up in Fig. 6(a) .
- the direction of the slant is arbitrarily chosen in accordance with restrictions of the facility for performing the machining process of the concave portions 11 b.
- Fig. 7 shows a camshaft 11 according to a third example embodiment of the present invention
- Fig. 8 shows a camshaft 11 according to a fourth example embodiment of the present invention
- the camshaft 11 of the third or fourth example embodiment is formed with two concave portions 11 b extending in opposite directions substantially symmetrically across the cam 14. Since the slant dictions of the two concave portions 11 b are set symmetrically across the cam 14, the ends of the concave portions 11 b can be opened on the same horizontal line at two positions distant from the central line of the camshaft 11 by a predetermined distance into the manufacturing clearance grooves 11c as shown in Fig. 7(a) or 8(a) . Thus, the lubrication of the sliding faces 11a at the two positions can be performed in the same state.
- the slant directions (positional relationship) of the concave portions 11 b of the third example embodiment shown in Fig. 7 are different from those of the fourth example embodiment shown in Fig. 8 .
- the slant directions may be chosen arbitrarily in accordance with the restrictions of the facility for performing the machining process of the concave portions 11 b like the first and second example embodiments.
- Figs. 9 to 12 show camshafts 11 according to fifth to eight example embodiments of the present invention respectively.
- the camshaft 11 of each one of the fifth to eighth example embodiments is formed with a concave portion 11 b on either one of two sliding faces 11 a.
- a common structure of the camshaft 11 is the same as that of each one of the first to fourth example embodiments.
- a sufficient lubricating effect can be obtained even though the concave portion 11 b is formed at only one position of the sliding face 11a depending on, e.g., a capacity or the number of the cylinder(s) of the high-pressure fuel supply pump.
- the number of the groove(s) may be arbitrarily selected in accordance with the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump.
- the camshaft 11 of the fifth example embodiment shown in Fig. 9 or the sixth example embodiment shown in Fig. 10 is formed with the concave portion 11 b on the sliding face 11a on the left hand in Fig. 9(a) or 10(a) .
- An end of the concave portion 11 b opens into the manufacturing clearance groove 11c, and the other end is blocked for the same reason as in the first to fourth example embodiments.
- the slant direction (positional relationship) of the concave portion 11 b is different between the fifth and sixth example embodiments shown in Figs. 9 and 10 .
- the slant direction of the concave portion 11 b may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of the concave portion 11 b as in the first and second example embodiments.
- the camshaft 11 according to the seventh example embodiment shown in Fig. 11 or the eighth example embodiment shown in Fig. 12 is formed with the concave portion 11b on the sliding face 11a on the right hand in Fig. 11(a) or 12(a) having the smallest diameter.
- the concave portion 11 b formed on the sliding face 11a which has the smallest diameter and receives large bearing stress, is effective in inhibition of the abrasion and seizing.
- An end of the concave portion 11 b opens into the manufacturing clearance groove 11c, and the other end is blocked for the same reason as the first to fourth example embodiments.
- the slant direction of the concave portion 11 b differs between the seventh and eighth example embodiments.
- the slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of the concave portion 11 b.
- Figs. 13 , 14 and 15 show the camshafts 11 of the ninth, tenth and eleventh example embodiments of the present invention respectively.
- a common structure of the camshaft 11 is similar to that of the camshaft 11 according to each one of the first to fourth example embodiments.
- a chamfer 11b as a concave portion is formed by partly cutting the outer periphery of at least one of the sliding faces 11a along a horizontal direction.
- at least one lubricating passage is formed on the camshaft 11 as shown in Fig. 13 , 14 or 15 .
- the lubricating passage extends along the rotation central axis of the camshaft 11.
- An end of the chamfer 11 b opens into the manufacturing clearance groove 11c and the other end is blocked.
- the chamfer 11b is formed by the milling process or cutting process. Process for eliminating burrs is applied to an edge between the chamfer 11 b and the sliding face 11a.
- the chamfer 11 b is formed through simple process for chamfering a part of the outer periphery of the sliding face 11a. Accordingly, the machining process is easy and the manufacturing cost can be reduced compared to the process for forming the concave portion such as the groove. Since the end of the chamfer 11 b opens into and communicates with the manufacturing clearance groove 11c, the lubricating fluid smoothly flows into the chamfer 11 b through the manufacturing clearance groove 11c. Thus, the friction can be further reduced.
- the chamfers 11 b are formed on both of the sliding faces 11a on both sides of the cam 14. Since the chamfers 11 b are formed on both of the sliding faces 11a, the lubricating effect can be exerted throughout the entire width of the sliding faces 11 a.
- the present invention can be applied to the large capacity high-pressure fuel supply pump or the multi-cylinder high-pressure fuel supply pump.
- the chamfer 11 b is formed only on the sliding face 11 on the left hand of Fig. 14(a) .
- the chamfer 11 b is formed only on the sliding face 11 a on the right hand of Fig. 15(a) .
- Even only one chamfer 11 b can exert a sufficient lubricating effect, depending on the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump.
- the number of the chamfer(s) may be selected in accordance with the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump.
- the chamfer 11 b formed on the sliding face 11 a on the right hand of Fig. 15(a) is effective in the inhibition of the abrasion and seizing of the sliding face 11 a, which has the smallest diameter and receives the large bearing stress.
- Figs. 16 , 17 and 18 show the camshafts 11 according to the twelfth, thirteenth and fourteenth example embodiments of the present invention respectively.
- the camshaft 11 according to the twelfth, thirteenth or fourteenth example embodiment is formed with a lubricating passage on the sliding face 14a of the cam 14 sliding on the bush 16 in the area, to which the reaction force of the fuel pressure-feeding operation is not applied, in addition to the lubricating passage 11 b formed on the camshaft 11 according to the first example embodiment shown in Fig. 5 .
- the area, to which the reaction force of the fuel pressure-feeding operation of the cam 14 is not applied, is the area B shown in Fig. 4 .
- the common structure of the camshaft 11 is the same as the camshaft 11 of each one of the above-described embodiments.
- the present invention can be applied to a large capacity multi-cylinder high-pressure fuel supply pump.
- the camshaft 11 according to the twelfth example embodiment shown in Fig. 16 is formed with a chamfer 14b as a lubricating passage on the sliding face 14a of the cam 14 sliding on the cam bush 16.
- the chamfer 14b extends along the rotation axis of the cam 14 and opens on both ends of the cam 14.
- the machining process of the chamfer 14b is the same as that of the ninth, tenth or eleventh embodiment shown in Fig. 13 , 14 or 15 .
- the camshaft 11 according to the thirteenth or fourteenth example embodiment shown in Fig. 17 or 18 is formed with a concave portion 14b as a lubricating passage on the sliding face 14a of the cam 14 sliding on the cam bush 16.
- the concave portion 14b is formed at a slant with respect to the rotation axis of the cam 14 and opens at the both ends of the cam 14.
- the machining process of the concave portion 14b is the same as that of the first to fourth example embodiments shown in Figs. 5 to 8 .
- the slant direction (positional relationship) of the concave portion 14b differs between the thirteenth and fourteenth example embodiments shown in Figs. 17 and 18 .
- the slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of the concave portion 14b.
- Figs. 19 , 20 and 21 show the camshafts 11 according to fifteenth, sixteenth and seventeenth example embodiments of the present invention respectively.
- the camshaft 11 of the fifteenth, sixteenth or seventeenth example embodiments is formed with a lubricating passage on the sliding face 14a of the cam 14 sliding on the cam bush 16 in an area, to which the reaction force of the fuel pressure-feeding operation is not applied, in addition to the lubricating passage 11 b formed on the camshaft 11 according to the ninth example embodiment shown in Fig. 13 .
- the area, to which the reaction force of the fuel pressure-feeding operation of the cam 14 is not applied, is the area B shown in Fig. 4 .
- the common structure of the camshaft 11 is the same as that of each one of the above-described embodiments.
- the lubrication of all the sliding faces 11 a, 14a of the camshaft 11 is improved by forming the lubricating passages 11 b, 14b on the sliding face 11 a of the camshaft 11 and the sliding face 14a of the cam 14. Therefore, the present invention can be applied to a large capacity multi-cylinder high-pressure fuel supply pump.
- the camshaft 11 according to the fifteenth example embodiment shown in Fig. 19 is formed with a chamfer 14b as a lubricating passage on the sliding face 14a of the cam 14 sliding on the cam bush 16.
- the chamfer 14b extends along the rotation central axis of the cam 14 and opens at both ends of the cam 14.
- the machining process of the chamfer 14b is similar to that of the ninth, tenth or eleventh embodiment shown in Fig. 13 , 14 or 15 .
- the camshaft 11 according to the sixteenth or seventeenth example embodiment shown in Fig. 20 or 21 is formed with the concave portion 14b as the lubricating passage on the sliding face 14a of the cam 14 sliding on the bush 16.
- the concave portion 14b is formed at a slant with respect to the rotation central axis of the cam 14 and opens at the both ends of the cam 14.
- the machining process of the concave portion 14b is similar to that of the first to fourth example embodiments shown in Figs. 5 to 8 .
- the slant direction of the concave portion 14b is different between the sixteenth and seventeenth example embodiments shown in Figs. 20 and 21 .
- the slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of the concave portion 14b.
- the lubricating passage is formed on the sliding face of the camshaft or the sliding face of the cam.
- the lubricating passage may be formed on the bearing of the housing, more preferably, on the bearing in the area, to which the reaction force of the fuel pressure-feeding operation of the plunger is not applied. Even in this case, similar effects are obtained.
- the present invention is applied to the high-pressure fuel supply pump used in the common rail fuel injection device of the vehicular diesel engine.
- the present invention may be applied to a high-pressure fuel supply pump used in a fuel injection device of a gasoline engine or a high-pressure fuel supply pump used in a device other than the vehicle.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
Description
- The present invention relates to a high-pressure fuel supply pump according to the preamble of
claim 1, that pressurizes fuel by reciprocating a plunger with rotation of a cam provided on a camshaft. Specifically, the present invention is suitably applied to a high-pressure fuel supply pump of a common rail (high-pressure fuel accumulation pipe) fuel injection device of a diesel engine. - A common rail fuel injection device of a diesel engine draws fuel from a fuel tank with a feed pump and pressurizes the drawn fuel with a high-pressure fuel supply pump. The fuel injection device pressure-feeds the high-pressure fuel into a common rail with the high-pressure fuel supply pump. The high-pressure fuel pressure-fed into the common rail is injected into a cylinder of the engine from an injector. A known high-pressure fuel supply pump is structured such that the central axis of the cam is deviated from the central axis of the camshaft as described in
JP-A-2002-310039 JP-A-2002-310039 - The camshaft as a component of the high-pressure fuel supply pump has sliding faces that are provided on both sides of the cam and slide on bearing metals attached to a housing. Problems such as abrasion or seizing of the sliding faces of the camshaft can be caused by an increase in a bearing stress at the sliding faces.
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DE 102 08 574 A shows a radial piston pump for a fuel injection device, which comprises a camshaft including a cam with its center being deviated from the rotational center of the camshaft for reciprocating a plunger in order to pressurize fuel. One end of the camshaft as well as the cam is supported by a bush bearing. For lubricating the rotational movement of the cam and/or the camshaft with fuel supplied by a feed pump, continuous grooves are formed between the bearings and the cam and/or the camshaft. - It is an object of the present invention to provide a high-pressure fuel supply pump capable of inhibiting abrasion or seizing by reducing friction at a sliding face of a camshaft.
- This object is achieved by a high-pressure fuel supply pump according to
claim 1 of the invention. - According to an aspect of the present invention, a high-pressure fuel supply pump has a camshaft, a cam, a housing and a plunger. The cam is provided on the camshaft such that a central axis of the cam is deviated from a central axis of the camshaft. The cam rotates with the camshaft. The housing is formed with a cam chamber for accommodating the camshaft and with a fuel pressurization chamber for pressurizing fuel. The plunger reciprocates due to the rotation of the cam to pressurize and to pressure-feed the fuel suctioned into the fuel pressurization chamber. The camshaft is rotatably held by a bearing formed in the housing at sliding faces formed on the camshaft on both sides of the cam. The fuel supply pump is formed with a lubricating passage for introducing the fuel in the cam chamber into a space between at least one of the sliding faces and the bearing.
- The lubricating passage has two ends such that one of the two ends on the cam side communicates with the cam chamber and the other one of the two end is blocked.
- With this structure, the fuel in the cam chamber as a lubricating fluid can be introduced into the space between the sliding face of the camshaft and the bearing through the lubricating passage. As a result, friction between the sliding face of the camshaft and the bearing is reduced, and abrasion or seizing can be inhibited.
- Features and advantages of embodiments will be appreciated, as well as methods of operation and the function of the related parts, from a study of the following detailed description, the appended claims, and the drawings, all of which form a part of this application. In the drawings:
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Fig. 1 is a schematic diagram showing a common rail fuel injection system of a diesel engine having a high-pressure fuel supply pump according to a first example embodiment of the present invention; -
Fig. 2 is a longitudinal sectional view showing the high-pressure fuel supply pump according to theFig. 1 embodiment; -
Fig. 3 is a sectional diagram showing the high-pressure fuel supply pump ofFig. 2 taken along the line III-III; -
Fig. 4 is a diagram showing a camshaft and a cam according to theFig. 1 embodiment; -
Fig. 5(a) is a view showing the camshaft according to theFig. 1 embodiment; -
Fig. 5(b) is a sectional view showing the camshaft ofFig. 5(a) taken along the line VB-VB; -
Fig. 6(a) is a view showing a camshaft according to a second example embodiment of the present invention; -
Fig. 6(b) is a sectional view showing the camshaft ofFig. 6(a) taken along the line VIB-VIB; -
Fig. 7(a) is a view showing a camshaft according to a third example embodiment of the present invention; -
Fig. 7(b) is a sectional view showing the camshaft ofFig. 7(a) taken along the line VIIB-VIIB; -
Fig. 8(a) is a view showing a camshaft according to a fourth example embodiment of the present invention; -
Fig. 8(b) is a sectional view showing the camshaft ofFig. 8(a) taken along the line VIIIB-VIIIB; -
Fig. 9(a) is a view showing a camshaft according to a fifth example embodiment of the present invention; -
Fig. 9(b) is a sectional view showing the camshaft ofFig. 9(a) taken along the line IXB-IXB; -
Fig. 10(a) is a view showing a camshaft according to a sixth example embodiment of the present invention; -
Fig. 10(b) is a sectional view showing the camshaft ofFig. 10(a) taken along the line XB-XB; -
Fig. 11 (a) is a view showing a camshaft according to a seventh example embodiment of the present invention; -
Fig. 11 (b) is a sectional view showing the camshaft ofFig. 11 (a) taken along the line XIB-XIB; -
Fig. 12(a) is a view showing a camshaft according to an eighth example embodiment of the present invention; -
Fig. 12(b) is a sectional view showing the camshaft ofFig. 12(a) taken along the line XIIB-XIIB; -
Fig. 13(a) is a view showing a camshaft according to a ninth example embodiment of the present invention; -
Fig. 13(b) is a sectional view showing the camshaft ofFig. 13(a) taken along the line XIIIB-XIIIB; -
Fig. 14(a) is a view showing a camshaft according to a tenth example embodiment of the present invention; -
Fig. 14(b) is a sectional view showing the camshaft ofFig. 14(a) taken along the line XIVB-XIVB; -
Fig. 15(a) is a view showing a camshaft according to an eleventh example embodiment of the present invention; -
Fig. 15(b) is a sectional view showing the camshaft ofFig. 15(a) taken along the line XVB-XVB; -
Fig. 16(a) is a view showing a camshaft according to a twelfth example embodiment of the present invention; -
Fig. 16(b) is a sectional view showing the camshaft ofFig. 16(a) taken along the line XVIB-XVIB; -
Fig. 16(c) is a bottom view showing the camshaft according to theFig. 16(a) embodiment; -
Fig. 17(a) is a view showing a camshaft according to a thirteenth example embodiment of the present invention; -
Fig. 17(b) is a sectional view showing the camshaft ofFig. 17(a) taken along the line XVIIB-XVIIB; -
Fig. 17(c) is a bottom view showing the camshaft according to theFig. 17(a) embodiment; -
Fig. 18(a) is a view showing a camshaft according to a fourteenth example embodiment of the present invention; -
Fig. 18(b) is a sectional view showing the camshaft ofFig. 18(a) taken along the line XVIIIB-XVIIIB; -
Fig. 18(c) is a bottom view showing the camshaft according to theFig. 18(a) embodiment; -
Fig. 19(a) is a view showing a camshaft according to a fifteenth example embodiment of the present invention; -
Fig. 19(b) is a sectional view showing the camshaft ofFig. 19(a) taken along the line XIXB-XIXB; -
Fig. 19(c) is a bottom view showing the camshaft according to theFig. 19(a) embodiment; -
Fig. 20(a) is a view showing a camshaft according to a sixteenth example embodiment of the present invention; -
Fig. 20(b) is a sectional view showing the camshaft ofFig. 20(a) taken along the line XXB-XXB; -
Fig. 20(c) is a bottom view showing the camshaft according to theFig. 20(a) embodiment; -
Fig. 21 (a) is a view showing a camshaft according to a seventeenth example embodiment of the present invention; -
Fig. 21 (b) is a sectional view showing the camshaft ofFig. 21 (a) taken along the line XXIB-XXIB; and -
Fig. 21(c) is a bottom view showing the camshaft according to theFig. 21 (a) embodiment. - Referring to
Fig. 1 , a common rail fuel injection system of avehicular diesel engine 1 having a high-pressurefuel supply pump 4 according to a first example embodiment of the present invention is illustrated. The four-cylinder engine 1 hasinjectors 2 mounted to respective cylinders. Eachinjector 2 injects fuel when theinjector 2 opens. The fuel is supplied from acommon rail 3, which is common to the cylinders, to theinjectors 2. The high-pressurefuel supply pump 4 pressurizes the fuel drawn from afuel tank 5 to high pressure and supplies the fuel to thecommon rail 3. Thecommon rail 3 accumulates and stores the high-pressure fuel. The fuel pressure in thecommon rail 3 defines injection pressure of theinjectors 2. An electronic control unit (ECU) 6 as a controller of the high-pressurefuel supply pump 4 controls the high-pressurefuel supply pump 4 to regulate the fuel pressure in thecommon rail 3. - The
ECU 6 controls various parts of theengine 1 such as theinjectors 2 or the high-pressurefuel supply pump 4. In order to control the various parts of theengine 1, theECU 6 reads in output signals of sensors attached to the various parts of theengine 1 for sensing operation states of theengine 1. Apressure sensor 7 for sensing the pressure in thecommon rail 3 is attached to thecommon rail 3. Arotation speed sensor 8 as a rotation cycle sensor is provided for sensing rotation of a crankshaft that outputs power of theengine 1. TheECU 6 maintains suitable operation of theengine 1 by controlling theinjectors 2 and the high-pressurefuel supply pump 4 based on the signals of thesensors -
Fig. 2 is a longitudinal sectional view showing the high-pressurefuel supply pump 4 according to the present embodiment.Fig. 3 is a sectional view showing the high-pressurefuel supply pump 4 ofFig. 2 taken along the line III-III. Acamshaft 11 is rotated by theengine 1. Thecamshaft 11 is accommodated in twohousings 12 made of an aluminum andcylinder blocks 20 as housings. Thecamshaft 11 is held by bearing metals asbearings 13 provided in the twohousings 12 at sliding faces 11 a such that thecamshaft 11 can rotate in a sliding manner. Acam 14 has a circular profile and is integrally formed with thecamshaft 11. The center of thecam 14 is deviated from the rotation center of thecamshaft 11. Thecam 14 slidably contacts acam bush 16, which is fitted into acam ring 15, at acam sliding face 14a. Thecam 14 rotates around the rotation central axis of thecamshaft 11. The two slidingfaces 11 a are formed on thecamshaft 11 on both sides of thecam 14. Thecam ring 15 does not rotate but evolves around the rotation central axis of thecamshaft 11 due to the rotation of thecam 14. - A
trochoid feed pump 17 is driven by thecamshaft 11. Thefeed pump 17 draws the fuel from thefuel tank 5 and pressure-feeds the fuel to a suction metering valve (not shown). Thefeed pump 17 is incorporated in the high-pressurefuel supply pump 4. Thefeed pump 17 communicates with acam chamber 27 surrounded and formed by the twohousings 12 and the twocylinder blocks 20, a clearance between the two slidingfaces 11 a of thecamshaft 11 and thebearings 13 and a clearance between thecam sliding face 14a of thecam 14 and thecam bush 16 as a bearing. Thus, these clearances are invariably filled with the fuel so that the fuel exerts a lubricating effect as a lubricating fluid. Anoil seal 18 prevents flowing out of the lubricating fluid supplied from thefeed pump 17 to the clearance between the sliding faces 11a and thebearings 13. Thecam 14 and thecam ring 15 rotate and revolve in thecam chamber 27. - The
plunger 19 reciprocates in acylinder 20a formed in theiron cylinder block 20 defining the housing. Aplunger head 19a formed integrally with a lower end of the plunger 19 (on a side closer to the center of the camshaft 11) slidably contacts thecam ring 15 due to a resilient force of aspring 22. Thecam ring 15 pushes up theplunger 19 through its revolving movement. - A
fuel pressurization chamber 21 is formed in thecylinder 20a. The fuel is suctioned from thefeed pump 17 through the fuel metering valve and afuel inlet passage 21 a and is pressurized in thefuel pressurization chamber 21 to high pressure through the reciprocation of theplunger 19. Afuel suction valve 23 has acheck valve 23a. Thecheck valve 23a prevents a backflow of the fuel into thefuel inlet passage 21 a when the fuel is pressurized in thefuel pressurization chamber 21. - A
fuel discharge passage 24 is connected to thefuel pressurization chamber 21. Afuel discharge valve 25 is provided downstream of thefuel discharge passage 24 with respect to the fuel flow. Thefuel discharge valve 25 has a ball-shapedvalve 25a, atapered seat 25b, on which thevalve 25a can be seated, and aspring 25c for biasing thevalve 25a to thetapered seat 25b. Thevalve 25a is normally seated on thetapered seat 25b. If the pressure of the fuel entering from thefuel discharge passage 24 becomes equal to or higher than the fuel pressure in afuel passage 26a, thevalve 25a separates from the taperedseat 25b. The fuel flows through thefuel passage 26a of aconnector 26 screwed to aconnection hole 20b of thecylinder block 20 and flows into thecommon rail 3. The twofuel discharge valves 23 open in turn in each half rotation of thecamshaft 11. - A
lubricating passage 11 b is formed on the slidingface 11 a of thecamshaft 11 for introducing the lubricating fluid to the slidingface 11a. Thelubricating passage 11 b is formed on the slidingface 11 a of thecamshaft 11 in an area, to which a reaction force due to the fuel pressure-feeding operation of theplunger 19 is not applied. In this area, the clearance between the slidingface 11a and the bearingmetal 13 is large. Accordingly, the lubricating fluid resides in the clearance, so the lubricating fluid can be held in the slidingpassage 11 b. - The area, to which the reaction force is not applied, will be explained in reference to
Fig. 4 . Thecam 14 rotates in accordance with the rotation of thecamshaft 11. The cam function starts at a point E and ends at a rising point F as shown inFig. 4 . There is a delay area C of the fuel pressure-feeding operation due to a delay in valve closing of thefuel suction valve 23 and the like. There is a residual area D of the reaction force because the fuel pressure in thefuel pressurization chamber 21 does not decrease sufficiently even after the rising point F. Accordingly, the reaction force is not applied to an area A (approximately a half of the circumference of the camshaft 11) of the slidingface 11a of thecamshaft 11 and an area B (approximately a half of the circumference of the cam 14) of thecam 14. Centers of the area A and the area B are slightly deviated from each other but the areas A, B approximately face each other. - The
lubricating passage 11 b is formed in the area A of the slidingface 11 a, to which the reaction force is not applied. Since the pressure applied to the slidingface 11 a by thebearing 13 is uneven, thelubricating passage 11 b should be preferably formed at the substantially center of the area A. - In the high-pressure
fuel supply pump 4 having the above-described structure, thecam 14 rotates due to the rotation of thecamshaft 11 and thecam ring 15 revolves due to the rotation of thecam 14. Thecam ring 15 moves in a radial direction of thecamshaft 11 due to the revolution of thecam ring 15 and pushes up theplunger 19. Thus, thecheck valve 23a of thefuel suction valve 23 closes and the fuel in thefuel pressurization chamber 21 is pressurized. The pressurized fuel flows into thefuel discharge passage 24. If the pressure of the pressurized fuel exceeds the fuel pressure in thefuel passage 26a, the fuel separates thevalve 25a from the taperedseat 25b and is accumulated in thecommon rail 3 through thefuel passage 26a. The fuel accumulated in thecommon rail 3 is supplied to theinjectors 2. If thecamshaft 11 rotates further to enter an area, in which thecam 14 does not exert the cam function, theplunger 19 existing at the rising point due to the revolution of thecam ring 15 descends due to the biasing force of the spring 22 (toward the center of the camshaft 11), and the fuel is suctioned into thefuel pressurization chamber 21 through thefuel inlet passage 21 a and thecheck valve 23a. Thus, the cycle of one rotation of thecamshaft 11 ends. The high-pressurefuel supply pump 4 of the present embodiment is a two-cylinder type. Therefore, the twoplungers 19 pressurize and pressure-feed the fuel in turn in each half rotation of thecamshaft 11. - Next, the
camshaft 11 of the present embodiment will be described in more detail in reference toFig. 5 . As shown inFig. 5(a) , thecam 14 is formed integrally with thecamshaft 11 at approximately the center of thecamshaft 11. Thecamshaft 11 rotates in a direction shown by an arrow mark inFig. 5(b) . The profile of thecam 14 is a circular shape. The central axis of thecam 14 is deviated from the rotation central axis of thecamshaft 11 by a predetermined distance. Therefore, thecam 14 rotates around the rotation central axis of thecamshaft 11. The diameters of the two slidingfaces 11 a are smaller than the diameter of thecam 14. The diameter of one slidingface 11 a on the right hand ofFig. 5(a) , to which an inner rotor (not shown) of thefeed pump 17 is attached, is smaller than the diameter of the other slidingface 11 a. Since the two slidingfaces 11 a have small bearing areas, large bearing stress is applied to the sliding faces 11 a by the reaction force due to the fuel pressure-feeding operation. -
Manufacturing clearance grooves 11c are formed on thecamshaft 11 on both sides of thecam 14. Themanufacturing clearance grooves 11c are necessary for finish processing of the slidingfaces 11a. Improvement (lowering) of surface roughness of the slidingfaces 11a is necessary because of the function of the sliding faces 11 a. Therefore, grinding process of the slidingfaces 11a is performed. In order to perform the grinding process over the entire width of each slidingface 11 a, a grindstone as a manufacturing tool has to be moved in a range wider than the entire width of the slidingface 11 a. In such a case, the grindstone contacts the end face of thecam 14. In order to avert the contact, themanufacturing clearance groove 11c having a predetermined width is formed. With themanufacturing clearance groove 11c, the grinding process can be performed over the entire width of the slidingface 11a while averting the contact between the grindstone and the end face of thecam 14. - The lubricating fluid is introduced to the
lubricating passages 11 b formed on the two slidingfaces 11a to reduce the friction between the sliding faces 11a and thebearings 13. Thus, abrasion and seizing can be inhibited. Since thelubricating passages 11 b are formed on both of the slidingfaces 11a, the lubricating effect is exerted over the entire width of the slidingfaces 11a. Thus, the present invention can be applied to a large capacity high-pressure fuel supply pump or a multi-cylinder high-pressure fuel supply pump. - The
lubricating passage 11 b extends at a slant with respect to the rotation central axis of thecamshaft 11 as shown inFig. 5(a) . By providing thelubricating passage 11 b at a suitable slant, inertia due to fluctuation in the rotation speed of thecamshaft 11 is applied to the lubricating fluid in thelubricating passage 11 b. Since thecamshaft 11 is driven by theengine 1, the rotation speed of thecamshaft 11 fluctuates due to the fluctuation of the rotation speed of theengine 1. Thus, the lubricating fluid is forced to flow along the slantedlubricating passages 11 b. This is a screw effect. As a result, lubricating performance between the sliding faces 11a and thebearings 13 is further improved. - Each
lubricating passage 11 b is a concave portion (groove) having a section in the shape of a cornered character C. Theconcave portion 11b is formed through a milling process. Process for eliminating burrs is applied to the edge between theconcave portion 11b and the slidingface 11 a. An end of theconcave portion 11 b opens into and communicates with themanufacturing clearance groove 11c. The other end is blocked. It is because the state in which the circumference of thecamshaft 11 is hermetically blocked by theoil seal 18 cannot be maintained if the other end is also opened. - Since the
lubricating passages 11 b are formed in the shape of the concave portions on the sliding faces 11a of thecamshaft 11, the lubricating fluid can be surely held in theconcave portions 11b. Thus, the friction can be further reduced. Since the ends of theconcave portions 11 b open into and communicate with themanufacturing clearance grooves 11c, the lubricating fluid smoothly flows into theconcave portions 11 b through themanufacturing clearance grooves 11 c. Thus, the friction can be further reduced. - A
camshaft 11 according to a second example embodiment of the present invention is shown inFig. 6 . As shown inFig. 6(a) , thecamshaft 11 of the second example embodiment is formed with twoconcave portions 11 b extending along the same slant direction like the first example embodiment. Since the twoconcave portions 11 b are set at the same slant direction, the machining process of the twoconcave portions 11 b can be performed by moving thecamshaft 11, which is placed as a processed object of the machining process, in only one direction perpendicular to the slant direction of theconcave portions 11 b. Thus, the first and second example embodiments can shorten the processing time and reduce the manufacturing cost. - The slant direction of the
concave portions 11 b of the second example embodiment shown inFig. 6 is different from that of the first example embodiment shown inFig. 5 . In the first example embodiment, theconcave portions 11 b extend diagonally right down inFig. 5(a) . In the second example embodiment, theconcave portions 11 b extend diagonally right up inFig. 6(a) . The direction of the slant is arbitrarily chosen in accordance with restrictions of the facility for performing the machining process of theconcave portions 11 b. -
Fig. 7 shows acamshaft 11 according to a third example embodiment of the present invention, andFig. 8 shows acamshaft 11 according to a fourth example embodiment of the present invention. Thecamshaft 11 of the third or fourth example embodiment is formed with twoconcave portions 11 b extending in opposite directions substantially symmetrically across thecam 14. Since the slant dictions of the twoconcave portions 11 b are set symmetrically across thecam 14, the ends of theconcave portions 11 b can be opened on the same horizontal line at two positions distant from the central line of thecamshaft 11 by a predetermined distance into themanufacturing clearance grooves 11c as shown inFig. 7(a) or8(a) . Thus, the lubrication of the slidingfaces 11a at the two positions can be performed in the same state. - The slant directions (positional relationship) of the
concave portions 11 b of the third example embodiment shown inFig. 7 are different from those of the fourth example embodiment shown inFig. 8 . The slant directions may be chosen arbitrarily in accordance with the restrictions of the facility for performing the machining process of theconcave portions 11 b like the first and second example embodiments. -
Figs. 9 to 12 show camshafts 11 according to fifth to eight example embodiments of the present invention respectively. Thecamshaft 11 of each one of the fifth to eighth example embodiments is formed with aconcave portion 11 b on either one of two slidingfaces 11 a. A common structure of thecamshaft 11 is the same as that of each one of the first to fourth example embodiments. A sufficient lubricating effect can be obtained even though theconcave portion 11 b is formed at only one position of the slidingface 11a depending on, e.g., a capacity or the number of the cylinder(s) of the high-pressure fuel supply pump. The number of the groove(s) may be arbitrarily selected in accordance with the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump. - The
camshaft 11 of the fifth example embodiment shown inFig. 9 or the sixth example embodiment shown inFig. 10 is formed with theconcave portion 11 b on the slidingface 11a on the left hand inFig. 9(a) or 10(a) . An end of theconcave portion 11 b opens into themanufacturing clearance groove 11c, and the other end is blocked for the same reason as in the first to fourth example embodiments. The slant direction (positional relationship) of theconcave portion 11 b is different between the fifth and sixth example embodiments shown inFigs. 9 and 10 . The slant direction of theconcave portion 11 b may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of theconcave portion 11 b as in the first and second example embodiments. - The
camshaft 11 according to the seventh example embodiment shown inFig. 11 or the eighth example embodiment shown inFig. 12 is formed with theconcave portion 11b on the slidingface 11a on the right hand inFig. 11(a) or 12(a) having the smallest diameter. Theconcave portion 11 b formed on the slidingface 11a, which has the smallest diameter and receives large bearing stress, is effective in inhibition of the abrasion and seizing. An end of theconcave portion 11 b opens into themanufacturing clearance groove 11c, and the other end is blocked for the same reason as the first to fourth example embodiments. The slant direction of theconcave portion 11 b differs between the seventh and eighth example embodiments. The slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of theconcave portion 11 b. -
Figs. 13 ,14 and 15 show thecamshafts 11 of the ninth, tenth and eleventh example embodiments of the present invention respectively. A common structure of thecamshaft 11 is similar to that of thecamshaft 11 according to each one of the first to fourth example embodiments. Achamfer 11b as a concave portion is formed by partly cutting the outer periphery of at least one of the sliding faces 11a along a horizontal direction. Thus, at least one lubricating passage is formed on thecamshaft 11 as shown inFig. 13 ,14 or 15 . The lubricating passage extends along the rotation central axis of thecamshaft 11. An end of thechamfer 11 b opens into themanufacturing clearance groove 11c and the other end is blocked. It is because the state in which theoil seal 18 hermetically blocks the circumference of thecamshaft 11 cannot be maintained if the other end is also opened. Thechamfer 11b is formed by the milling process or cutting process. Process for eliminating burrs is applied to an edge between thechamfer 11 b and the slidingface 11a. - Since the lubricating passage in the shape of the
chamfer 11 b is formed on the slidingface 11a of thecamshaft 11, the lubricating fluid can be surely held at thechamfer 11b. Thus, the friction can be further reduced. Thechamfer 11 b is formed through simple process for chamfering a part of the outer periphery of the slidingface 11a. Accordingly, the machining process is easy and the manufacturing cost can be reduced compared to the process for forming the concave portion such as the groove. Since the end of thechamfer 11 b opens into and communicates with themanufacturing clearance groove 11c, the lubricating fluid smoothly flows into thechamfer 11 b through themanufacturing clearance groove 11c. Thus, the friction can be further reduced. - In the ninth example embodiment shown in
Fig. 13 , thechamfers 11 b are formed on both of the sliding faces 11a on both sides of thecam 14. Since thechamfers 11 b are formed on both of the slidingfaces 11a, the lubricating effect can be exerted throughout the entire width of the sliding faces 11 a. Thus, the present invention can be applied to the large capacity high-pressure fuel supply pump or the multi-cylinder high-pressure fuel supply pump. - In the tenth example embodiment shown in
Fig. 14 , thechamfer 11 b is formed only on the slidingface 11 on the left hand ofFig. 14(a) . In the eleventh example embodiment shown inFig. 15 , thechamfer 11 b is formed only on the slidingface 11 a on the right hand ofFig. 15(a) . Even only onechamfer 11 b can exert a sufficient lubricating effect, depending on the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump. The number of the chamfer(s) may be selected in accordance with the capacity or the number of the cylinder(s) of the high-pressure fuel supply pump. Thechamfer 11 b formed on the slidingface 11 a on the right hand ofFig. 15(a) is effective in the inhibition of the abrasion and seizing of the slidingface 11 a, which has the smallest diameter and receives the large bearing stress. -
Figs. 16 ,17 and18 show thecamshafts 11 according to the twelfth, thirteenth and fourteenth example embodiments of the present invention respectively. Thecamshaft 11 according to the twelfth, thirteenth or fourteenth example embodiment is formed with a lubricating passage on the slidingface 14a of thecam 14 sliding on thebush 16 in the area, to which the reaction force of the fuel pressure-feeding operation is not applied, in addition to thelubricating passage 11 b formed on thecamshaft 11 according to the first example embodiment shown inFig. 5 . The area, to which the reaction force of the fuel pressure-feeding operation of thecam 14 is not applied, is the area B shown inFig. 4 . The common structure of thecamshaft 11 is the same as thecamshaft 11 of each one of the above-described embodiments. - Thus, lubrication of all of the sliding faces 11 a, 14a of the
camshaft 11 is improved by forming thelubricating passages camshaft 11 and the slidingface 14a of thecam 14. Thus, the present invention can be applied to a large capacity multi-cylinder high-pressure fuel supply pump. - The
camshaft 11 according to the twelfth example embodiment shown inFig. 16 is formed with achamfer 14b as a lubricating passage on the slidingface 14a of thecam 14 sliding on thecam bush 16. Thechamfer 14b extends along the rotation axis of thecam 14 and opens on both ends of thecam 14. The machining process of thechamfer 14b is the same as that of the ninth, tenth or eleventh embodiment shown inFig. 13 ,14 or 15 . - The
camshaft 11 according to the thirteenth or fourteenth example embodiment shown inFig. 17 or18 is formed with aconcave portion 14b as a lubricating passage on the slidingface 14a of thecam 14 sliding on thecam bush 16. Theconcave portion 14b is formed at a slant with respect to the rotation axis of thecam 14 and opens at the both ends of thecam 14. The machining process of theconcave portion 14b is the same as that of the first to fourth example embodiments shown inFigs. 5 to 8 . - The slant direction (positional relationship) of the
concave portion 14b differs between the thirteenth and fourteenth example embodiments shown inFigs. 17 and18 . The slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of theconcave portion 14b. -
Figs. 19 ,20 and21 show thecamshafts 11 according to fifteenth, sixteenth and seventeenth example embodiments of the present invention respectively. Thecamshaft 11 of the fifteenth, sixteenth or seventeenth example embodiments is formed with a lubricating passage on the slidingface 14a of thecam 14 sliding on thecam bush 16 in an area, to which the reaction force of the fuel pressure-feeding operation is not applied, in addition to thelubricating passage 11 b formed on thecamshaft 11 according to the ninth example embodiment shown inFig. 13 . The area, to which the reaction force of the fuel pressure-feeding operation of thecam 14 is not applied, is the area B shown inFig. 4 . The common structure of thecamshaft 11 is the same as that of each one of the above-described embodiments. - The lubrication of all the sliding faces 11 a, 14a of the
camshaft 11 is improved by forming thelubricating passages face 11 a of thecamshaft 11 and the slidingface 14a of thecam 14. Therefore, the present invention can be applied to a large capacity multi-cylinder high-pressure fuel supply pump. - The
camshaft 11 according to the fifteenth example embodiment shown inFig. 19 is formed with achamfer 14b as a lubricating passage on the slidingface 14a of thecam 14 sliding on thecam bush 16. Thechamfer 14b extends along the rotation central axis of thecam 14 and opens at both ends of thecam 14. The machining process of thechamfer 14b is similar to that of the ninth, tenth or eleventh embodiment shown inFig. 13 ,14 or 15 . - The
camshaft 11 according to the sixteenth or seventeenth example embodiment shown inFig. 20 or21 is formed with theconcave portion 14b as the lubricating passage on the slidingface 14a of thecam 14 sliding on thebush 16. Theconcave portion 14b is formed at a slant with respect to the rotation central axis of thecam 14 and opens at the both ends of thecam 14. The machining process of theconcave portion 14b is similar to that of the first to fourth example embodiments shown inFigs. 5 to 8 . - The slant direction of the
concave portion 14b is different between the sixteenth and seventeenth example embodiments shown inFigs. 20 and21 . The slant direction may be arbitrarily selected in accordance with the restrictions of the facility for performing the machining process of theconcave portion 14b. - In the above-described embodiments, the lubricating passage is formed on the sliding face of the camshaft or the sliding face of the cam. Alternatively, the lubricating passage may be formed on the bearing of the housing, more preferably, on the bearing in the area, to which the reaction force of the fuel pressure-feeding operation of the plunger is not applied. Even in this case, similar effects are obtained. In the above-described embodiments, the present invention is applied to the high-pressure fuel supply pump used in the common rail fuel injection device of the vehicular diesel engine. Alternatively, the present invention may be applied to a high-pressure fuel supply pump used in a fuel injection device of a gasoline engine or a high-pressure fuel supply pump used in a device other than the vehicle.
- The present invention should not be limited to the disclosed embodiments, but may be implemented in many other ways without departing from the scope of the invention, as defined by the appended claims.
Claims (18)
- A high-pressure fuel supply pump (4) comprising:a camshaft (11);a cam (14) that is provided on the camshaft (11) such that a central axis of the cam (14) is deviated from a central axis of the camshaft (11) and that rotates with the camshaft (11);a housing (12, 20) formed with a cam chamber (27) for accommodating the camshaft (11) and with a fuel pressurization chamber (21) for pressurizing the fuel; anda plunger (19) that reciprocates due to the rotation of the cam (14) to pressurize and to pressure-feed the fuel suctioned into the fuel pressurization chamber (21),
whereinthe camshaft (11) is rotatably held by a bearing (13) provided in the housing at sliding faces (11a) defined by outer peripheral surfaces of the camshaft (11) on both sides of the cam (14), andthe high-pressure fuel supply pump (4) is formed with a first lubricating passage (11b) for introducing the fuel in the cam chamber (27) into a space between at least one of the sliding faces (11a) and the bearing (13)
characterized in thatthe first lubricating passage (11b) has two ends such that one of the two ends on the cam (14) side communicates with the cam chamber (27) and the other one of the two end is blocked. - The high-pressure fuel supply pump (4) as in claim 1, wherein the first lubricating passage (11b) is formed on at least one of the sliding faces (11a) of the camshaft (11).
- The high-pressure fuel supply pump (4) as in claim 1 or 2, wherein the first lubricating passage (11b) extends in a direction inclined with respect to a rotation central axis of the camshaft (11).
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 3, wherein the first lubricating passage (11b) is provided by forming a concave portion on the sliding face (11a) of the camshaft (11).
- The high-pressure fuel supply pump (4) as in claim 1 or 2, wherein the first lubricating passage (11b) is provided by forming a chamfer on the sliding face (11a) of the camshaft (11).
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 3, wherein the first lubricating passage (11b) is provided by forming a groove on the sliding face (11a) of the camshaft (11).
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 6, wherein the first lubricating passage (11b) opens into one of manufacturing clearance grooves (11c) formed on the camshaft (11) on the both sides of the cam (14).
- The high-pressure fuel supply pump (4) as in claim 1, wherein the first lubricating passage (11b) is formed on an inner peripheral surface of the bearing (13).
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 8, wherein the first lubricating passage (11b) is formed in an area, to which a reaction force of the fuel pressure-feeding operation of the plunger (19) is not applied.
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 9, wherein the cam (14) is formed with a second lubricating passage (14b) on a cam sliding face (14a) defined by an outer peripheral surface of the cam (14) for introducing the fuel in the cam chamber (27) into a space between the cam sliding face (14a) and an intermediate member (16), through which the cam (14) applies a force to the plunger (19).
- The high-pressure fuel supply pump (4) as in claim 10, wherein the second lubricating passage (14b) extends in a direction inclined with respect to a rotation central axis of the cam (14).
- The high-pressure fuel supply pump (4) as in claim 10 or 11, wherein the second lubricating passage (14b) is provided by forming a concave portion on the cam sliding face (14a) of the cam (14).
- The high-pressure fuel supply pump (4) as in claim 10, wherein the second lubricating passage (14b) is provided by forming a chamfer on the cam sliding face (14a) of the cam (14).
- The high-pressure fuel supply pump (4) as in claim 10 or 11, wherein the second lubricating passage (14b) is provided by forming a groove on the cam sliding face (14a) of the cam (14).
- The high-pressure fuel supply pump (4) as in any one of claims 10 to 14, wherein
the second lubricating passage (14b) opens into the manufacturing clearance grooves (11c). - The high-pressure fuel supply pump (4) as in any one of claims 10 to 15, wherein the second lubricating passage (14b) is formed in an area, to which a reaction force of the fuel pressure-feeding operation of the plunger (19) is not applied.
- The high-pressure fuel supply pump (4) as in any one of claims 1 to 16, wherein the one of the two ends of the lubricating passage (11b) opens into one of manufacturing clearance grooves (11c) formed on the camshaft (11) on both sides of the cam (14).
- A common rail fuel injection device for a diesel engine (1) comprising a common rail and the high-pressure fuel supply pump (4) as in any one of claims 1 to 17, wherein the high-pressure fuel supply pump (4) supplies high-pressure fuel to the common rail (3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005276162A JP4428327B2 (en) | 2005-09-22 | 2005-09-22 | High pressure fuel supply pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1767771A1 EP1767771A1 (en) | 2007-03-28 |
EP1767771B1 true EP1767771B1 (en) | 2008-07-02 |
Family
ID=37309631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060121057 Expired - Fee Related EP1767771B1 (en) | 2005-09-22 | 2006-09-21 | High-pressure fuel supply pump |
Country Status (3)
Country | Link |
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EP (1) | EP1767771B1 (en) |
JP (1) | JP4428327B2 (en) |
DE (1) | DE602006001615D1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007050808A1 (en) * | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | High pressure fuel pump |
ITMI20072259A1 (en) * | 2007-11-30 | 2009-06-01 | Bosch Gmbh Robert | HIGH PRESSURE PUMP |
DE102008017222A1 (en) * | 2008-04-04 | 2009-10-08 | Continental Automotive Gmbh | Pump arrangement for conveying a fluid |
JP5288267B2 (en) * | 2009-03-25 | 2013-09-11 | 株式会社デンソー | Fuel injection pump |
DE102011079781A1 (en) * | 2011-07-26 | 2013-01-31 | Continental Automotive Gmbh | Shaft for high pressure pump i.e. fuel high pressure pump, for delivering fluid i.e. fuel, in internal combustion engine in motor car, has helical-formed or pocket-like recess arranged in exterior wall section for receiving lubricant |
CN103047100A (en) * | 2013-01-10 | 2013-04-17 | 无锡开普机械有限公司 | Rotor pump with cam shaft sleeve |
JP6148637B2 (en) * | 2014-04-07 | 2017-06-14 | 株式会社丸山製作所 | Reciprocating pump |
CN104307830B (en) * | 2014-09-29 | 2016-06-01 | 温岭市九洲电机制造有限公司 | A kind of cleaning machine |
GB201515435D0 (en) * | 2015-09-01 | 2015-10-14 | Delphi Int Operations Lux Srl | High pressure fuel pump |
CN108457853B (en) * | 2018-04-10 | 2019-08-20 | 中国北方发动机研究所(天津) | A kind of high pressure pump plunger is from pressurizing and lubricating structure |
WO2023034888A1 (en) * | 2021-09-03 | 2023-03-09 | Cummins Inc. | Camshaft with profiled journals for use with a fuel pump |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3852756B2 (en) * | 2001-02-07 | 2006-12-06 | 株式会社デンソー | Fuel injection pump |
DE10208574A1 (en) * | 2001-12-01 | 2003-06-12 | Bosch Gmbh Robert | Radial piston pump |
JP3852753B2 (en) * | 2001-12-04 | 2006-12-06 | 株式会社デンソー | Fuel injection pump |
DE10247645A1 (en) * | 2002-10-11 | 2004-04-22 | Robert Bosch Gmbh | Radial piston pump for high pressure fuel supply has at least one lubricant pocket in plates |
AT7501U1 (en) * | 2003-08-08 | 2005-04-25 | Verdichter Oe Ges M B H | END BEARING |
-
2005
- 2005-09-22 JP JP2005276162A patent/JP4428327B2/en not_active Expired - Fee Related
-
2006
- 2006-09-21 DE DE200660001615 patent/DE602006001615D1/en active Active
- 2006-09-21 EP EP20060121057 patent/EP1767771B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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EP1767771A1 (en) | 2007-03-28 |
DE602006001615D1 (en) | 2008-08-14 |
JP2007085270A (en) | 2007-04-05 |
JP4428327B2 (en) | 2010-03-10 |
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