CN102405345A - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
CN102405345A
CN102405345A CN2010800173640A CN201080017364A CN102405345A CN 102405345 A CN102405345 A CN 102405345A CN 2010800173640 A CN2010800173640 A CN 2010800173640A CN 201080017364 A CN201080017364 A CN 201080017364A CN 102405345 A CN102405345 A CN 102405345A
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CN
China
Prior art keywords
lubricant oil
mentioned
drain passageway
oil drain
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.)
Granted
Application number
CN2010800173640A
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Chinese (zh)
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CN102405345B (en
Inventor
田中雅道
芝裕二
柴田义明
高岸勋
吴服荣太
南光政树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanmar Power Technology Co Ltd
Original Assignee
Yanmar Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2009102513A external-priority patent/JP5255506B2/en
Priority claimed from JP2009217565A external-priority patent/JP5350155B2/en
Application filed by Yanmar Co Ltd filed Critical Yanmar Co Ltd
Publication of CN102405345A publication Critical patent/CN102405345A/en
Application granted granted Critical
Publication of CN102405345B publication Critical patent/CN102405345B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Droplets of a lubricating oil from the gear case side which is interconnected with a pump housing is made less likely to enter into the pump housing to thereby prevent mixing of the lubricating oil into fuel occurring due to the droplets of the lubricating oil. A fuel injection pump (1) is provided with a pump housing (3) interconnected with a gear case (50). The pump housing (3) is provided with a lubricating oil discharge hole (3j) for connecting the inside of the pump housing (3) and the inside of the gear case (50), a groove which connects to the lubricating oil discharge hole (3j), and a cover (60) mounted to the pump housing (3) and covering the lubricating oil discharge hole (3j) and a part of the groove from the gear case (50) side. The lubricating oil discharge hole (3j), the groove, and the cover (60) form a bent-shaped communication path for connecting the inside of the pump housing (3) and the inside of the gear case (50).

Description

Fuel-injection pump
Technical field
The present invention relates to a kind of fuel-injection pump that is installed in the fuel injection system of motor.
Background technique
In the past; The fuel-injection pump of well-known following structure (for example; With reference to patent documentation 1): the bent axle through motor drives the camshaft that is supported on pump case by axle, makes plunger to-and-fro motion along the vertical direction through the cam that is arranged at above-mentioned camshaft, comes force feed fuel through this plunger.This fuel-injection pump is stored in lubricant oil in the cam chamber of the bottom that is formed at pump case, comes the lubricated drive components such as cam in this cam chamber that are housed in.
And fuel-injection pump constitutes and on pump case, is formed with the lubricant oil tap hole, can lubricant oil be discharged in the gear-box that is provided with that links to each other with pump case through this lubricant oil tap hole from cam chamber.In addition, the lubricant oil that is discharged to this gear-box be used for lubrication gear box from the bent axle of motor with transmission of power to the power transfer unit of the camshaft of fuel-injection pump, the bent axle that is used for lubricating engine or piston etc.
In addition, in this fuel-injection pump, plunger guide bush is sleeved on the fluid head on the pump case, plunger is slided up and down be inserted in freely in this plunger guide bush.Be formed with pressurized chamber (fuel pressure chamber) above the plunger in plunger guide bush.The bottom of the plunger below plunger guide bush is twined and is equipped with this plunger spring of the application of force downwards, and is connected with tappet.Tappet slides up and down that to be inserted in tappet freely indoor, with cam crimping mutually.This tappet chamber is formed on the top of the cam chamber of pump case, is connected with this cam chamber.
The existing technology document
Patent documentation
Patent documentation 1: TOHKEMY 2008-106780 communique
Summary of the invention
The problem that invention will solve
In the structure in the past shown in patent documentation 1, have following situation: lubricant oil forms the spittle and in gear-box, enters into the cam chamber in the pump case through the lubricant oil tap hole that is formed on the pump case, thereby the spittle quantitative change of the lubricant oil in the cam chamber is many.
Under the spittle quantitative change of the lubricant oil in the cam chamber situation how; There is following situation in that kind shown in figure 22: the spittle of lubricant oil 82 arrives and is attached to the bottom of plunger 81; Through this plunger 81 to-and-fro motion along the vertical direction; Lubricant oil 82 moves to the top through the plunger 81 and the gap of plunger guide bush 80, and the leakage return slot 80a through fuel 83 is blended in the fuel 83.Perhaps, exist lubricant oil 82 to continue again to rise and invade the pressurized chamber and be blended into the situation in the fuel 83.Therefore, lubricant oil 82 in fuel 83 to sneak into quantitative change many, and might produce degradation problem under fuel 83 blackening, the engine performance.
Therefore, the object of the present invention is to provide a kind of spittle that makes the lubricant oil of the gear box side that is provided with from linking to each other to be not easy to enter in this pump case with pump case and can suppress since the lubricant oil that the spittle of this lubricant oil produces to the fuel-injection pump of sneaking into of fuel.
The scheme that is used to deal with problems
The present invention is a kind of fuel-injection pump, and it possesses the pump case that links to each other and be provided with gear-box, and in this fuel-injection pump, above-mentioned pump case possesses: intercommunicating pore, and it is with being communicated with in this pump case with in the said gear case; Slot part, it is connected with this intercommunicating pore; And cover; It is installed on the above-mentioned pump case; Cover a part and the above-mentioned intercommunicating pore of above-mentioned slot part from said gear case side, wherein, constituted in the above-mentioned pump case and the communication paths of the bending shape that is communicated with in the said gear case by above-mentioned intercommunicating pore, above-mentioned slot part and above-mentioned cover.
The present invention is formed with the through hole of a part that constitutes above-mentioned communication paths on above-mentioned cover, with this through hole be configured to respect to above-mentioned intercommunicating pore over against the position stagger.
The present invention is on the above-mentioned communication paths and between above-mentioned pump case and above-mentioned cover, be provided with the lubricant oil that can accumulate lubricant oil and accumulate portion.
The present invention forms the cam chamber of taking in cam on above-mentioned pump case; And being formed with the tappet chamber of taking in the tappet that is connected with above-mentioned cam, between the position of the above-mentioned tappet of ratio near plunger one side of above-mentioned cam chamber and above-mentioned tappet chamber, be formed with the prevention portion that stops them to be connected with mode that above-mentioned cam chamber is connected.
The present invention is used as the first lubricant oil drain passageway with above-mentioned intercommunicating pore; Above-mentioned through hole is used as the 3rd lubricant oil drain passageway; With above-mentioned communication paths except above-mentioned intercommunicating pore and the part the above-mentioned through hole as the second lubricant oil drain passageway; Constituted the lubricant oil drain passageway that is used to make lubricant oil to discharge in above-mentioned gear-box via the above-mentioned first lubricant oil drain passageway, the above-mentioned second lubricant oil drain passageway, above-mentioned the 3rd lubricant oil drain passageway successively in the above-mentioned pump case, the area of passage of the area of passage and above-mentioned the 3rd lubricant oil drain passageway that makes the above-mentioned second lubricant oil drain passageway is respectively less than the area of passage of the above-mentioned first lubricant oil drain passageway.
The present invention makes the area of passage of the area of passage of above-mentioned the 3rd lubricant oil drain passageway less than the above-mentioned second lubricant oil drain passageway.
The position of the present invention below leaning on than the above-mentioned first lubricant oil drain passageway is provided with above-mentioned the 3rd lubricant oil drain passageway.
The above-mentioned cover of the present invention be provided with can with the protuberance or the recess or the protuberance of recess tabling that are formed on the above-mentioned pump case, can be installed on the above-mentioned pump case thereby should cover with locating.
The effect of invention
According to the present invention, because communication paths is connected with intercommunicating pore bendingly, so change taken place in the flow direction of the lubricant oil between communication paths and the intercommunicating pore, thereby enters in the pump case through intercommunicating pore from the spittle of the lubricant oil of gear box side is very difficult.And fluctuation pressure is decaying when fuel-injection pump transmits from gear box side, thereby has reduced the fluctuation pressure of fuel-injection pump.Thereby the present invention can reduce the spittle amount of the lubricant oil in the pump case, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
According to the present invention, communication paths is owing to through hole bends, and therefore change has taken place the flow direction of lubricant oil on communication paths, thereby is difficult to enter in the pump case through intercommunicating pore from the spittle of the lubricant oil of gear box side.Thereby the present invention can reduce the spittle amount of the lubricant oil in the pump case, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.And, can utilize fastening piece that the end of cover is installed on the pump case.Thereby the present invention can realize the raising of the shock resistance of this cover.
According to the present invention,, be not easy to be sent to pump case from gear box side along with the fluctuation pressure that produces that moves up and down of the piston of DENG decays through accumulating the lubricant oil that accumulates in the portion at lubricant oil.Thereby the present invention can reduce the spittle amount of the lubricant oil in the pump case, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
According to the present invention, the spittle of the lubricant oil in the pump case be difficult to enter into place, pressurized chamber that fuel is provided from cam chamber, the tappet chamber compare the position of tappet near plunger one side.Thereby the present invention can suppress because lubricant oil the sneaking into to fuel that the spittle of the lubricant oil in the pump case produces.
According to the present invention, the area of passage of the gear box side of lubricant oil drain passageway is less than the area of passage of pump case side, thereby lubricant oil accumulates easily in the 3rd lubricant oil drain passageway.Therefore, the fluctuation pressure that produces along with moving up and down of the piston of DENG is not easy to be sent to pump case from gear box side owing to the lubricant oil that accumulates in the 3rd lubricant oil drain passageway is decayed.Thereby the present invention can reduce the spittle amount of the lubricant oil in the pump case, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
According to the present invention, the area of passage of the gear box side of lubricant oil drain passageway diminishes towards gear box side gradually, so lubricant oil accumulates more easily in the 3rd lubricant oil drain passageway.Therefore, the fluctuation pressure that produces along with moving up and down of the piston of DENG is not easy to be sent to pump case from gear box side owing to the lubricant oil that accumulates in the 3rd lubricant oil drain passageway is decayed.Thereby the present invention can reduce the spittle amount of the lubricant oil in the pump case, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
According to the present invention, when lubricant oil is discharged in gear-box in the pump case, in the lubricant oil drain passageway from above flow down downwards.Thereby the present invention can make lubricant oil flow smoothly, thereby has improved the greasy property of fuel-injection pump.
According to the present invention, the installation exercise that covers easily.Thereby the present invention can carry out the assembling operation of fuel-injection pump efficiently.
Description of drawings
Fig. 1 is the integrally-built right flank sectional view of the related fuel-injection pump of expression an embodiment of the invention.
Fig. 2 is the integrally-built front section view of the related fuel-injection pump of expression an embodiment of the invention.
(a) of Fig. 3 is the plan view of the related flange of expression first mode of execution, (b) is the plan view that the related flange of expression first mode of execution has been installed the state of cover.
(a) of Fig. 4 is the related flange of expression first mode of execution and the stereogram of cover, (b) is the plan view that the related flange of expression first mode of execution has been installed the state of cover.
(a) of Fig. 5 is the plan view of expression cover, (b) is the right side view of expression cover.
(a) of Fig. 6 is the figure that flows of the lubricant oil in the expression first lubricant oil tap hole and first communication paths, (b) is the figure that flows of the lubricant oil in the expression second lubricant oil tap hole and second communication paths.
(a) of Fig. 7 is the plan view of the related flange of expression second mode of execution, (b) is the plan view that the related flange of expression second mode of execution has been installed the state of cover.
(a) of Fig. 8 is the plan view of expression cover, (b) is the right side view of expression cover.
(a) of Fig. 9 be expression have in the fuel-injection pump of the related flange of first mode of execution with gear-box in the plotted curve of fluctuation pressure of lubricant oil separately, (b) be expression have in the fuel-injection pump of the related flange of second mode of execution with gear-box in the plotted curve of fluctuation pressure of lubricant oil separately.
Figure 10 is near the right flank sectional view of the structure the expression tappet.
Figure 11 is the side sectional view of the related fuel-injection pump of expression other mode of execution of the present invention.
Figure 12 is the front section view of the related fuel-injection pump of expression other mode of execution of the present invention.
Figure 13 is the plan view of expression lip part and cover.
Figure 14 is the exploded perspective view of expression lip part and cover.
Figure 15 is the plan view of the slot part of expression lip part.
Figure 16 is the stereogram of expression cover.
Figure 17 is the plan view of expression cover.
Figure 18 is that A among Figure 16 is to view.
(a) of Figure 19 is the figure of the lubricant oil drain passageway of expression left, (b) is the figure of right-hand lubricant oil drain passageway of expression.
Figure 20 is the figure of the expression second lubricant oil drain passageway.
Figure 21 is near the right flank sectional view of other structure the expression tappet.
Figure 22 is that expression lubricant oil is blended into the figure that sneaks into the path in the fuel.
Embodiment
The mode of execution of fuel-injection pump of the present invention is described.
Mode of execution 1
At first, the overall structure to the related fuel-injection pump 1 of an embodiment of the invention describes.
In the explanation below; The regulation fore-and-aft direction is come in act as a fuel the place ahead of jet pump 1 of the direction that will represent with the arrow F of Fig. 1; The regulation above-below direction is come in the act as a fuel top of jet pump 1 of the direction that will represent with the arrow U of Fig. 1, and the act as a fuel left of jet pump 1 of the direction that will represent with the arrow L of Fig. 2 comes the regulation left and right directions.
Fuel-injection pump 1 is the structure member that is installed in the fuel injection system of DENG, after the fuel that provides from fuel tank is pressurizeed, in predetermined timing with the fuel of established amount through the injection pipe force feed to Fuelinjection nozzle.As depicted in figs. 1 and 2, fuel-injection pump 1 is the distribution type fuel-injection pump with fuel distribution/force feed to a plurality of Fuelinjection nozzles.
Fuel-injection pump 1 constitutes through fluid head 2 and pump case 3 are engaged up and down.
In fluid head 2, be inserted with plunger guide bush 4.Plunger 5 slides up and down and is encased in freely in this plunger guide bush 4.In fluid head 2, be provided with cold-starting time movement 6 in the left front of plunger guide bush 4, across plunger guide bush 4 and at the right-hand accumulator 7 that is provided with.Between the upper end portion of plunger guide bush 4 and plunger 5, be formed with pressurized chamber 8.
In plunger guide bush 4, be blended into phenomenon (fuel leak) lubricant oil from plunger guide bush 4 with the clearance leakage of plunger 5 in order to reduce fuel, leak return slot 4a and be formed with.Leaking return slot 4a is connected with not shown fuel tank.
Front upper part at pump case 3 is formed with tappet chamber 20, and is inserted with the underpart of plunger guide bush 4.Plunger 5 is given prominence to downwards towards tappet chamber 20 from the underpart of plunger guide bush 4.
Periphery is set with upper springs support 21 in the underpart of plunger guide bush 4.Be set with lower springs support 22 in the underpart of plunger 5.Between the lower surface of the upper surface of lower springs support 22 and upper springs support 21, be incorporated with plunger 5 spring 23 of the application of force downwards.Be arranged to tappet 24 can reciprocatingly slide along the vertical direction in tappet chamber 20 underpart at plunger 5.
Tappet 24 is the cylindric of opening up.Be provided with lower springs support 22 at tappet 24 internal fixation.Tappet 24 through lower springs support 22 with plunger 5 by spring 23 application of force downwards.Roller portion 25 rotates the bottom that is supported on tappet 24 freely by axle through roll shaft 26.Be provided with adjustment pad 27 between the lower surface of upper surface in tappet 24 and lower springs support 22.
Superior posterior at pump case 3 is formed with tooth bar chamber 30.30 inside, tooth bar chamber are provided with tooth bar.Rear portion at fluid head 2 is inserted with distribution shaft 31 along the vertical direction.The underpart of distribution shaft 31 is projected in the tooth bar chamber 30.Passing shaft 32 is fixedly installed on the underpart of distribution shaft 31 through shaft coupling 33 and distribution shaft 31 coaxial hearts.Passing shaft 32 sets up along the vertical direction and the rotatable earth's axis is supported in the pump case 3.The rotatable earth's axis in the upper end portion of passing shaft 32 is supported on the axle support 34 of pump case 3, and is positioned by the position of positioning element 35 to its axle direction (above-below direction).
Be connected through the oil circuit 9 that is formed in the fluid head 2 with pressurized chamber 8 in the distribution shaft 31.In fluid head 2, be provided with delivery valve 10 through supporting member 11 at the rear side of distribution shaft 31.Delivery valve 10 prevents that the fuel in the injection pipe flow into pressurized chamber 8 when fuel-injection pump 1 sprays end.
Be formed with cam chamber 40 in the bottom of pump case 3.In cam chamber 40 with the axle direction of camshaft 41 as fore-and-aft direction set up camshaft 41.Camshaft 41 through first camshaft bearing 42 and second camshaft bearing, 43 rotatably supports in pump case 3.Cam chamber 40 lubricated oil fill up.Lubricant oil through cam chamber 40 is lubricated the cam on the camshaft 41 44.Cam 44 is configured in the front portion of cam chamber 40, connects with preliminary roller portion 25.
Take in the bevel gear 45 that is fixedly installed on the camshaft 41 in the back inside of cam chamber 40.Passing shaft 32 is outstanding downwards towards cam chamber 40 from the upper surface of cam chamber 40.The underpart of passing shaft 32 be set with camshaft 41 on the bevel gear 46 that is meshed of bevel gear 45.
Camshaft 41 from the rear portion of pump case 3 outside pump case 3 and rearward outstanding.Back projection at this camshaft 41 is provided with the governor sleeve 12 and governor weight 13 that constitutes governor mechanism.
Front portion (the place ahead of cam chamber 40) at pump case 3 is formed with flange 3a.Camshaft 41 is in gear-box 50 and forwards outstanding from flange 3a.Gear-box 50 is configured in the place ahead of pump case 3, the setting that links to each other with pump case 3, and be installed on the engine main body of DENG.In gear-box 50, camshaft holding flange 52 is fixedly installed on the front end of camshaft 41.On this camshaft holding flange 52, be set with cam wheel 51 through supporting member 53.And, can be delivered to power transfer unit, camshaft 41 in the gear-box 50 through cam wheel 51 grades from the power of the bent axle of DENG.
In addition, on flange 3a, be formed with make in the pump case 3, be cam chamber 40 with gear-box 50 in two lubricant oil tap hole 3i, the 3j that are connected as intercommunicating pore.The lubricant oil of cam chamber 40 is discharged in the gear-box 50 through two lubricant oil tap hole 3i, 3j.After the cover 60 stated to be installed in the outside of flange 3a with these lubricant oil tap holes 3i, 3j mode in opposite directions.
In the related fuel-injection pump 1 of this structure, power is delivered to camshaft 41 from the bent axle of DENG, when camshaft 41 rotations, cam 44 is rotated with the rotation of camshaft 41.With the rotation of this cam 44 correspondingly, tappet 24 to-and-fro motion along the vertical direction, and plunger 5 is by the lower springs support 22 and the to-and-fro motion along the vertical direction that are fixed on the tappet 24.
And, through the to-and-fro motion of plunger 5, alternately carry out to pressurized chamber 8 suck the suction stroke of fuel and from the pressurized chamber 8 discharge fuel the discharge stroke.That is to say, in suction stroke, when plunger 5 is pressed when descending through spring 23 application of forces, be inhaled into pressurized chamber 8 from the fuel of fuel tank (supply pump).In discharging stroke, when plunger 5 is brought to when rising through spring 23 application of forces, the fuel that is drawn into pressurized chamber 8 pressurized and through oil circuit 9 force feeds to distribution shaft 31.Distributed to delivery valve 10 by the fuel of force feed to distribution shaft 31 through distribution shaft 31, go out from fuel injection valves inject through injection pipe.
The structure of the flange 3a that first mode of execution is related then, is described.
Like Fig. 1, Fig. 3 and shown in Figure 4, flange 3a forms the front and sees the general triangular shape.At the central part of this flange 3a through hole 3d is formed the front and see the circular shape.As stated, above-mentioned camshaft 41 is through this through hole 3d, by 43 supportings of second camshaft bearing.On front surface, will the circular 3b of hub portion in the periphery outside of through hole 3d form forwards and give prominence to as the outer side surface of flange 3a.The 3b of hub portion can be entrenched among the through hole 50a that runs through the back surface that is arranged at gear-box 50.And, being entrenched under the state among the through hole 50a with the mode in gear-box 50 at the 3b of hub portion, bolt is entrenched in by screw thread among the mounting hole 3c that runs through the periphery outside that is arranged at the 3b of hub portion etc., thereby flange 3a is fixed with gear-box 50.
Shown in Fig. 3 (a) and Fig. 4 (a), on the front surface of the 3b of hub portion, slot part 3e extends along the circumferencial direction of the 3b of hub portion, and in front view, slot part 3e forms a part that cuts annulus and sees roughly C shape in the front of right-hand opening.Slot part 3e with towards the mode of gear-box 50 sides towards front openings.In slot part 3e, a plurality of next door 3f of convex, 3f ... Every separated predetermined distance is configured on the circumferencial direction of the 3b of hub portion.Slot part 3e through a plurality of next door 3f, 3f ... Be separated into first slot part, second slot part, the 3rd slot part, the 4th slot part, the 5th slot part.These slot parts begin the clockwise direction configuration seen along the front by the order of first slot part, second slot part, the 3rd slot part, the 4th slot part, the 5th slot part from an end of the upper right quarter that is positioned at slot part 3e.Be formed with the mounting hole 3g of cover 60 at the topmost part (first slot part) of slot part 3e.Be formed with the mounting hole 3h of cover 60 at the foot (the 4th slot part) of slot part 3e.
In addition, in the bottom of the upper right quarter (first slot part) of slot part 3e, the first lubricant oil tap hole 3i form fore-and-aft direction linearly shape extend, in rear end side towards cam chamber 40, in forward end in the gear-box 50 of the setting that links to each other with pump case 3.Left part in slot part 3e (the 3rd slot part), the second lubricant oil tap hole 3j form fore-and-aft direction linearly shape extend, in rear end side towards cam chamber 40, in forward end in the gear-box 50 of the setting that links to each other with pump case 3.The first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j respectively along fore-and-aft direction through flange 3a, make its with pump case 3 in cam chamber 40 and gear-box 50 in be connected.That is to say,, be communicated with in the cam chamber 40 in the pump case 3 and the gear-box 50 through these the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j.
When being installed in fuel injection system in the DENG, the front that the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j are configured in fuel-injection pump 1 is respectively looked when seeing horizontal line than the axle center through camshaft 220 and is leaned on the position of top, or is configured to make the underpart to be positioned at the position of the height of above-mentioned degree with respect to above-mentioned horizontal line.Like this, the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j can be discharged to lubricant oil in the gear-box 50 in pump case 3 according to the amount of the lubricant oil in the pump case 3 in right amount.
(b), Fig. 4 and shown in Figure 5 like Fig. 3; Cover 60 is flow directions with the lubricant oil among edge and the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j, be resin, the metal sheet material on the direction of the fore-and-aft direction quadrature plane of extending, it forms the roughly C shape that the part that cuts annulus when the front is seen obtains.Cover 60 is and slot part 3e shapes similar to set surface area for and be slightly smaller than slot part 3e when seeing in the front.The length of the circumferencial direction of cover 60 is configured to shorter than the length of the circumferencial direction of slot part 3e.
Cover 60 by the first planar surface portion 60a, rearward depression the first recess 60b, the second planar surface portion 60e and rearward the second recess 60f of depression constitute concavo-convex.When this front is seen, be roughly in the cover 60 of C shape, each several part begins by the clockwise direction configuration when the front is seen of the order of the first planar surface portion 60a, the first recess 60b, the second planar surface portion 60e, the second recess 60f from an end that is positioned at cover 60 upper right quarter.
Cover 60 is entrenched among the slot part 3e and makes the first recess 60b be positioned at the topmost part of slot part 3e, and the second recess 60f is positioned at the foot of slot part 3e, and the second planar surface portion 60e is positioned at the left part of slot part 3e.Carrying out this when chimeric, when seeing in the front in, cover the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j by cover 60 from gear-box 50 sides.At length say, cover the first lubricant oil tap hole 3i from gear-box 50 sides, cover the second lubricant oil tap hole 3j from gear-box 50 sides by the second planar surface portion 60e by the first planar surface portion 60a that covers 60.
Central authorities up and down at each recess 60b, 60f are formed with mounting hole 60c, 60g along fore-and-aft direction.Mounting hole 60c, 60g are used for when making cover 60 be entrenched in slot part 3e, being installed to flange 3a.In addition, be formed with tap hole 60h in the bottom of the second planar surface portion 60e along fore-and-aft direction as through hole.
Cover 60 aligns two mounting hole 60c, 60g respectively with mounting hole 3g, the 3h of slot part 3e, as above-mentioned, be entrenched in afterwards on the slot part 3e of flange 3a.And cover 60 comes screw thread to be entrenched among mounting hole 3g, the 3h through being inserted into from the place ahead as the bolt 61,61 of fastening piece mounting hole 60c, the 60g, is installed to flange 3a thus and goes up (with reference to (b) of Fig. 3 and (b) of Fig. 4).At this moment, cover 60 be configured to the first lubricant oil tap hole 3i in opposite directions, and in gear-box 50.
As above-mentioned, will cover under 60 situation about being installed on the flange 3a, such shown in Fig. 3 (b), the first planar surface portion 60a of cover 60 be configured in first slot part of slot part 3e and the first lubricant oil tap hole 3i over against the position on.In other words, overlaid when first slot part of slot part 3e and the first planar surface portion 60a are configured to see in the front, and the first lubricant oil tap hole 3i and first planar surface portion 60a overlaid when being configured to see in the front.Thus, in the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j and the gear-box 50 not linearly shape be communicated with.
At this moment, cover 60 contact next door 3f, 3f ..., except this contact segment, form the space between cover 60 and each slot part of slot part 3e.First space between first planar surface portion 60a that is formed on cover 60 in these spaces and first slot part of slot part 3e constitutes the part of the first communication paths 3m.Direction (fore-and-aft direction) direction of quadrature (lower direction haply) extension mutually that this first spatial configuration becomes the edge and the first lubricant oil tap hole 3i to extend.
Simultaneously, as the tap hole 60d of the through hole of a part that constitutes the first communication paths 3m, be formed on the lower right part of the first planar surface portion 60a of cover 60 along fore-and-aft direction.Tap hole 60d is the breach hole, be configured to respect to the inclined right of second lubricant oil tap hole 3j below over against the position.Through this tap hole 60d, produce the gap at flange 3a and cover between 60, above-mentioned first space is connected through in tap hole 60d and the gear-box 50.
Like this, the first communication paths 3m is made up of above-mentioned first space and tap hole 60d, between cover 60 and pump case 3, is connected with the first lubricant oil tap hole 3i and be bending state ground.Its result, the first communication paths 3m is connected through the cam chambers 40 in the first lubricant oil tap hole 3i and the pump case 3, and the first lubricant oil tap hole 3i is connected through in the first communication paths 3m and the gear-box 50.That is to say that the cam chamber 40 in the pump case 3 and gear-box 50 are interior to be connected through the first lubricant oil tap hole 3i and the first communication paths 3m.
Therefore; As the hollow arrow in Fig. 6 (a); Lubricant oil after this first lubricant oil tap hole 3i flows out to the first communication paths 3m, touches the first planar surface portion 60a of cover 60 from the first lubricant oil tap hole 3i that flows through of the cam chambers 40 in the pump case 3; Thereby this flow direction is changed to lower direction haply from fore-and-aft direction, in the first communication paths 3m, flow towards the lower right of the first lubricant oil tap hole 3i.Lubricant oil touches the inner peripheral surface of first slot part in front of arriving tap hole 60d the time, thereby this flow direction is changed to fore-and-aft direction from lower direction haply, flows in the gear-box 50 from tap hole 60d.
That is to say, shown in Fig. 6 (a), the first lubricant oil tap hole 3i and the first communication paths 3m, be that the drain passageway (communication paths) of lubricant oil constitutes crank-like, thereby in the drain passageway of this lubricant oil, be formed with kink 3x.Therefore, lubricant oil is not that linearly shape flows in the gear-box 50 when the first lubricant oil tap hole 3i discharges, but behind the change flow direction, flows to the first communication paths 3m, changes flow direction once more after tap hole 60d flows in the gear-box 50.In a word; Lubricant oil changes flow direction between the first lubricant oil tap hole 3i and the first communication paths 3m; And also change flow direction in the middle of the first communication paths 3m, the cam chamber 40 in the pump case 3 is discharged in the gear-box 50 via the first lubricant oil tap hole 3i, the first communication paths 3m successively simultaneously.
Therefore; In gear-box 50; As the blacking arrow in Fig. 6 (a); At lubricant oil under the situation that the first lubricant oil tap hole 3i side of pump case 3 is dispersed, the spittle of this lubricant oil with the first lubricant oil tap hole 3i over against the position near touch cover 60 the first planar surface portion 60a, invade the first lubricant oil tap hole 3i thereby stoped.In addition; Even the spittle of lubricant oil has arrived tap hole 60d; Also be bound in the drain passageway of lubricant oil edge and above-mentioned lubricant oil flow direction, promptly discharge direction in the opposite direction and flow, promptly be bound between the first communication paths 3m and the first lubricant oil tap hole 3i, to change the flow direction flows through kink 3x, so be difficult to invade the first lubricant oil tap hole 3i.
Likewise, will cover under 60 situation about being installed on the flange 3a, the second planar surface portion 60e of cover 60 be configured in the 3rd slot part of slot part 3e and the second lubricant oil tap hole 3j over against the position on.In other words, overlaid when the 3rd slot part of slot part 3e and the first planar surface portion 60a are configured to see in the front, and the second lubricant oil tap hole 3j and second planar surface portion 60e overlaid when being configured to see in the front.
In addition, the 3rd space that between the 3rd slot part of cover 60 second planar surface portion 60e and slot part 3e, forms constitutes the part of the second communication paths 3n.Direction (fore-and-aft direction) direction of quadrature (lower direction haply) extension mutually that the 3rd spatial configuration becomes the edge and the first lubricant oil tap hole 3i to extend.
As the tap hole 60h of the through hole of a part that constitutes the second communication paths 3n, be formed on the bottom of the second planar surface portion 60e of cover 60 along fore-and-aft direction.Tap hole 60h be configured to respect to the second lubricant oil tap hole 3j over against deflection below, position.Above-mentioned the 3rd space is connected through in this tap hole 60h and the gear-box 50.
Like this, the second communication paths 3n is made up of above-mentioned the 3rd space and tap hole 60h, between cover 60 and pump case 3, is connected with the second lubricant oil tap hole 3j and be bending state ground.Its result, the second communication paths 3n is connected through the cam chambers 40 in the second lubricant oil tap hole 3j and the pump case 3, and the second lubricant oil tap hole 3j is connected through in the second communication paths 3n and the gear-box 50.That is to say that the cam chamber 40 in the pump case 3 and gear-box 50 are interior to be connected through the second lubricant oil tap hole 3j and the second communication paths 3n.
Therefore; As the hollow arrow in Fig. 6 (a); Lubricant oil after this second lubricant oil tap hole 3j flows out to the second communication paths 3n, touches the second planar surface portion 60e of cover 60 from the second lubricant oil tap hole 3j that flows through of the cam chambers 40 in the pump case 3; Thereby this flow direction is changed to lower direction haply from fore-and-aft direction, in the second communication paths 3n, below the second lubricant oil tap hole 3j, flow.Lubricant oil touches the inner peripheral surface of the 3rd slot part in front of arriving tap hole 60h the time, thereby this flow direction is changed to fore-and-aft direction from lower direction haply, flows in the gear-box 50 from tap hole 60h.
That is to say, shown in Fig. 6 (b), the second lubricant oil tap hole 3j and the second communication paths 3n, be that the drain passageway (communication paths) of lubricant oil constitutes crank-like, thereby be formed with kink 3y midway at the drain passageway of this lubricant oil.Therefore, lubricant oil is not that linearly shape flows in the gear-box 50 when the second lubricant oil tap hole 3j discharges, but behind the change flow direction, flows to the second communication paths 3n, changes flow direction once more after tap hole 60h flows in the gear-box 50.In a word; Lubricant oil changes flow direction between the second lubricant oil tap hole 3j and the second communication paths 3n; And also change flow direction midway at the second communication paths 3n, and the cam chamber 40 in the pump case 3 is discharged in the gear-box 50 via the second lubricant oil tap hole 3j, the second communication paths 3n successively.
At this, shown in Fig. 6 (b), lubricant oil is when flowing through the second communication paths 3n, and the tap hole 60h that accumulates in than above-mentioned the 3rd space leans on the ground, position of below to flow in the gear-box 50 through tap hole 60h.Like this, with the drain passageway that is connected in cam chamber 40 and the gear-box 50 midway and between pump case 3 and cover 60, be provided with lubricant oil and accumulate the 3p of portion.
Therefore; In gear-box 50; As the blacking arrow in Fig. 6 (b); At lubricant oil under the situation that the second lubricant oil tap hole 3j side of pump case 3 is dispersed, the spittle of this lubricant oil with the second lubricant oil tap hole 3j over against the position near touch cover 60 the first planar surface portion 60a, invade the second lubricant oil tap hole 3j thereby stoped.In addition; Even the spittle of lubricant oil has arrived tap hole 60h; Also be bound to the flow direction in the drain passageway of lubricant oil edge and above-mentioned lubricant oil, promptly discharge direction in the opposite direction through kink 3y flows, promptly be bound between the second communication paths 3n and the second lubricant oil tap hole 3j, change the flow direction flows, so be difficult to invade the second lubricant oil tap hole 3j.
According to this structure, the spittle of lubricant oil is difficult in gear-box 50, to enter into the cam chamber 40 in the pump case 3 through the first communication paths 3m and the first lubricant oil tap hole 3i and the second communication paths 3n and the second lubricant oil tap hole 3j.Thereby fuel-injection pump 1 can reduce the spittle amount of the lubricant oil in the cam chamber 40.As a result of, fuel-injection pump 1 spittle that can suppress lubricant oil arrives and is attached to the bottom of plunger 5, through this plunger 5 to-and-fro motion along the vertical direction lubricant oil invaded to leak return slot 4a through the gap of plunger 5 and plunger guide bush 4, pressurized chamber 8 is blended in the fuel.
The structure of the flange 103a that second mode of execution is related then, is described.Wherein, to the parts additional phase identical with the parts of the structure of first mode of execution with reference character, with the first mode of execution different portions be that the center describes.
Shown in Fig. 7 (a), flange 103a forms the front and sees the general triangular shape.In this flange 103a, the circular 103b of hub portion is formed forwards outstanding at its front surface central part.Be formed with the front of rearward caving in the periphery outside of through hole 3d and see the roughly slot part 103e of C shape.Outer peripheral portion in slot part 103e is formed with and forms step-like cover support 103k.Be formed with the mounting hole 103g of cover 70 at the lower right part of slot part 103e.
In addition, the lower right part in slot part 103e will form as two lubricant oil tap hole 103i, 103i of through hole along fore-and-aft direction linearly shape extend, in rear end side towards cam chamber 40, in forward end in the gear-box 50 of the setting that links to each other with pump case 3.Two lubricant oil tap hole 103i, 103i are configured to clip mounting hole 103g.Through these lubricant oil tap holes 103i, 103i, be communicated with in the cam chamber 40 in the pump case 3 and the gear-box 50.
Like Fig. 7 (b) and shown in Figure 8, cover 70 is flow directions with the lubricant oil among edge and each lubricant oil tap hole 103i, be resin, the metal sheet material on the direction of the fore-and-aft direction quadrature plane of extending, and it forms the front and sees roughly C shape.Cover 70 is and a part of shapes similar of slot part 103e to set the part that surface area is slightly smaller than slot part 103e for when seeing in the front.The length of the circumferencial direction of cover 70 is configured to shorter than the length of the circumferencial direction of slot part 103e.
Cover 70 is made up of planar surface portion 70a and notch part 70c.In cover 70, planar surface portion 70a is configured on the whole circumference direction of cover 70, and notch part 70c is configured in the middle part outer circumferential side of the circumferencial direction of cover 70.
Cover 70 is entrenched in the bottom of slot part 103e and makes notch part 70c be positioned at the foot of slot part 103e.Carrying out this when chimeric, when seeing, covering two lubricant oil tap hole 103i, 103i from gear-box 50 sides by cover 70 in the front.Be formed with along fore-and-aft direction at the central part of planar surface portion 70a and be used for mounting hole 70b that cover 70 is installed on the above-mentioned flange 103a.
This cover 70 makes mounting hole 70b align with mounting hole 103g, and then as above-mentioned, is entrenched on the slot part 103e of flange 103a.And cover 70 comes screw thread to be entrenched among the mounting hole 103g through bolt 61,61 is inserted into outside pump case 3 the mounting hole 70b, be installed to thus on the flange 103a.At this moment, cover 70 be configured to two lubricant oil tap hole 103i, 103i in opposite directions, and in gear-box 50.
As above-mentioned, will cover under 70 situation about being installed on the flange 103a, the planar surface portion 70a of cover 70 be configured in two lubricant oil tap hole 103i of the part of slot part 103e and flange 103a, 103i over against the position on.In other words, the overlaid when part of slot part 103e and planar surface portion 70a are configured to see in the front, and two lubricant oil tap hole 103i, 103i and planar surface portion 70a overlaid when being configured to see in the front.Thus, in each lubricant oil tap hole 103i and the gear-box 50 not linearly shape be communicated with.
At this moment, cover 70 contact cover support 103k, except this contact segment, form the space between the planar surface portion 70a of cover 70 and the slot part 103e.This space constitutes the part of communication paths 103n.Direction (fore-and-aft direction) direction of quadrature (lower direction haply) extension mutually that this spatial configuration becomes edge and lubricant oil tap hole 103i to extend.
Simultaneously, as tap hole 70d, the 70d of the through hole of a part that constitutes communication paths 103n, be formed on the right ends portion of the planar surface portion 70a of cover 70 along fore-and-aft direction.Each tap hole 70d is the breach hole, be configured to respect to inclined left or the upper right of each lubricant oil tap hole 103i over against the position.Through these tap holes 70d, 70d, produce the gap at flange 103a and cover between 70, above-mentioned space is connected through in each tap hole 70d and the gear-box 50.
Like this, communication paths 103n is made up of above-mentioned space and two tap hole 70d, 70d, between cover 70 and pump case 3, is connected with each lubricant oil tap hole 103i and be bending state ground.Its result, communication paths 103n is connected through the cam chambers 40 in each lubricant oil tap hole 103i and the pump case 3, and each lubricant oil tap hole 103i is connected through in communication paths 103n and the gear-box 50.That is to say that the cam chamber 40 in the pump case 3 and gear-box 50 are interior to be connected through two lubricant oil tap hole 103i, 103i and communication paths 103n.
Therefore; Lubricant oil is from the cam chambers 40 in the pump case 3 flow through two lubricant oil tap hole 103i, 103i; After these two lubricant oil tap hole 103i, 103i flow out to communication paths 103n, touch the planar surface portion 70a of cover 70, thereby this flow direction is changed to lower direction haply from fore-and-aft direction; In communication paths 103n, above each lubricant oil tap hole 103i, flow, flow in the gear-box 50 from tap hole 70d, 70d.At this, tap hole 70d be configured to respect to the staggering of lubricant oil tap hole 103i, 103i over against the position.
That is to say; Make two the lubricant oil tap hole 103i, 103i and the communication paths that are connected in cam chamber 40 and the gear-box 50 in the pump case 3, be that the drain passageway of lubricant oil constitutes crank-like, thereby be formed with kink midway at the drain passageway of this lubricant oil.Therefore, the lubricant oil of discharging from each lubricant oil tap hole 103i is not that linearly shape flows in the gear-box 50, but behind the change flow direction, flows to communication paths 103n, in tap hole 70d flows to gear-box 50.In a word, lubricant oil changes flow direction between each lubricant oil tap hole 103i and communication paths 103n, and the cam chamber 40 in the pump case 3 is discharged in the gear-box 50 via each lubricant oil tap hole 103i, communication paths 103n successively simultaneously.
At this, lubricant oil accumulates in and is formed at and covers in the space between 70 the planar surface portion 70a when flowing through communication paths 103n, flows in gear-box 50 through tap hole 70d simultaneously.Like this, with the drain passageway that is connected in cam chamber 40 and the gear-box 50 midway and between pump case 3 and cover 70, be provided with lubricant oil and accumulate the 103p of portion.In this mode of execution, also form lubricant oil that lubricant oil accumulates the 103p of portion through in the gap that forms between the notch part 70c of cover 70 and the slot part 103e and inflow in gear-box 50.
Therefore; In gear-box 50; Even at lubricant oil under the situation that each lubricant oil tap hole 103i side of pump case 3 is dispersed; The spittle of this lubricant oil also can with each lubricant oil tap hole 103i over against the position near touch cover 70 planar surface portion 70a, invade each lubricant oil tap hole 103i thereby stoped.In addition; Even the spittle of lubricant oil has arrived tap hole 70d; Also be bound to the flow direction in the drain passageway of lubricant oil edge and above-mentioned lubricant oil, promptly discharge direction in the opposite direction through the kink flows, promptly be bound between communication paths 103n and the first lubricant oil tap hole 3i, change the flow direction flows, so be difficult to invade each lubricant oil tap hole 103i.
According to this structure, the spittle of lubricant oil is difficult in gear-box 50, enter into the cam chamber 40 in the pump case 3 through communication paths 103n and two lubricant oil tap hole 103i.Thereby fuel-injection pump 1 can reduce the spittle amount of the lubricant oil in the cam chamber 40.As a result of, fuel-injection pump 1 spittle that can suppress lubricant oil arrives and is attached to the bottom of plunger 5, through this plunger 5 to-and-fro motion along the vertical direction lubricant oil invaded to leak return slot 4a through the gap of plunger 5 and plunger guide bush 4, pressurized chamber 8 is blended in the fuel.
In addition; In fuel-injection pump 1; That kind shown in figure 21 is under the situation of the through hole 22a that is respectively arranged with above-below direction on hypothesis lower springs support 22 and the adjustment pad 27,27a, because the roller portion 25 of tappet 24 contacts with cam 44;, it is rotated when rotating; The lubricant oil that offers cam 44 is taken up through the rotation of roller portion 25, flow into the position that tappet 24 leans on plunger 5 sides of comparing of tappet chamber 20, and enter into from the gap of plunger 5 and plunger guide bush 4 and to leak return slot 4a, pressurized chamber 8 and be blended into fuel from through hole 22a, 27a.
For this reason, in fuel-injection pump 1, that kind shown in figure 10 is not provided with the through hole of above-below direction on above-mentioned lower springs support 22 and above-mentioned adjustment pad 27.Thus, fuel-injection pump 1 is through in formation prevention portion 28 between the roller portion 25 of tappet 24 and the lower springs support 22, and the lubricant oil that prevents to be attached to the roller portion 25 of tappet enters in the tappet 24, can reduce the amount of movement of lubricant oil in fuel.
As stated, fuel-injection pump 1 possesses the pump case 3 that links to each other and be provided with gear-box 50.And; In this fuel-injection pump 1; Pump case 3 possess with in the pump case 3 with gear-box 50 in the first lubricant oil tap hole 3i that is connected and the second lubricant oil tap hole 3j (two lubricant oil tap hole 103i, 103i), slot part that is connected with the first lubricant oil tap hole 3i and the slot part that is connected with the second lubricant oil tap hole 3j and be installed on the pump case 3 and cover the cover 60 (cover 70) of the part of the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (two lubricant oil tap hole 103i, 103i) and above-mentioned each slot part from gear-box 50 sides, by the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (two lubricant oil tap hole 103i, 103i), above-mentioned slot part and above-mentioned cover 60 (covering 70) constituted with above-mentioned pump case 3 interior with gear-box 50 in communication paths, the i.e. first lubricant oil tap hole 3i and the first communication paths 3m and the second lubricant oil tap hole 3j and the second communication paths 3n (two lubricant oil tap hole 103i, 103i and communication paths 103n) of the bending shape that is connected.
Thus; The first communication paths 3m is connected with the second lubricant oil tap hole 3j (each lubricant oil tap hole 103i) with respect to the first lubricant oil tap hole 3i respectively with the second communication paths 3n (communication paths 103n) bendingly; Therefore the flow direction of the lubricant oil between the first communication paths 3m and the second communication paths 3n (communication paths 103n) and the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (each lubricant oil tap hole 103i) changes, and enters in the pump case 3 through the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (each lubricant oil tap hole 103i) thereby make from the spittle of the lubricant oil of gear-box 50 sides is very difficult.Therefore, the fluctuation pressure that produces along with moving up and down of the piston of DENG has reduced the fluctuation pressure of fuel-injection pump 1 when gear-box 50 sides are delivered to fuel-injection pump 1, cover 60, being attenuated.Thereby fuel-injection pump 1 can reduce the spittle amount of the lubricant oil in the pump case 3, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
In addition; To cover under 60 situation about being installed on the related flange 3a of first mode of execution; Enumerate object lesson, the fluctuation pressures in the gear-box 50 of the fluctuation pressure in the pump case 3 such and DENG shown in Fig. 9 (a) are compared roughly 60% of fluctuation pressure in the gear-box 50 that decays to DENG.
In addition, covering under 70 situation about being installed on the related flange 103a of second mode of execution, enumerate object lesson, the fluctuation pressures in the gear-box 50 of the fluctuation pressure in the pump case 3 such and DENG shown in Fig. 9 (b) are compared and are roughly decayed to 0.
Fuel-injection pump 1 will be formed on and cover on 60 as the tap hole 60d of the through hole of a part that constitutes the first communication paths 3m and the second communication paths 3n (communication paths 103n) and tap hole 60h (two tap hole 70d, 70d), be configured to respect to the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (each lubricant oil tap hole 103i) over against the position stagger.
Thus; The first communication paths 3m and the second communication paths 3n (communication paths 103n) bend because of tap hole 60d and tap hole 60h (each tap hole 70d); Therefore the first communication paths 3m and the second communication paths 3n (communication paths 103n) midway the flow direction of lubricant oil change, thereby make the spittle be difficult to enter in the pump case 3 through the first lubricant oil tap hole 3i and the second lubricant oil tap hole 3j (each lubricant oil tap hole 103i) from the lubricant oil of gear-box 50 sides.Thereby fuel-injection pump 1 can reduce the spittle amount of the lubricant oil in the pump case 3, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.And the end that can utilize bolt 61,61 will cover 60 (covers 70) is installed on the pump case 3.Thereby fuel-injection pump 1 can be realized the raising of the shock resistance of this cover 60 (cover 70).
Fuel-injection pump 1 accumulates portion 3p (lubricant oil accumulate portion 103p) in going up and between flange 3a of pump case 3 (flange 103a) and cover 60 (cover 70), the lubricant oil that can accumulate lubricant oil being set of the second communication paths 3n (communication paths 103n) midway.
Thus,, decay, be not easy to be sent to pump case 3 from gear-box 50 sides through accumulating in the lubricant oil that lubricant oil accumulates among the 3p of portion (lubricant oil accumulates the 103p of portion) along with the fluctuation pressure that moves up and down and produce of the piston of DENG.Thereby fuel-injection pump 1 can reduce the spittle amount of the lubricant oil in the pump case 3, suppresses because the spittle generation lubricant oil of lubricant oil is sneaked into to fuel.
Fuel-injection pump 1 is formed with the cam chamber 40 of taking in cam 44 in pump case 3; And form and the tappet chamber 20 of taking in cam 44 contacted tappets 24 is connected the ratio tappet 24 prevention portion 28 that they are connected by formation prevention between the position of plunger 5 sides with cam chamber 40 in cam chamber 40 and tappet chamber 20.
Thus, the spittle of the lubricant oil in the pump case 3 is difficult to enter into pressurized chamber's 8 sides from cam chamber 40 fuelings.Thereby fuel-injection pump 1 can suppress because lubricant oil the sneaking into to fuel that the spittle of the lubricant oil in the pump case 3 produces.
Mode of execution 2
Below, the fuel-injection pump 201 that other mode of execution of the present invention is related is described.
In the explanation below; The regulation fore-and-aft direction is come in act as a fuel the place ahead of jet pump 201 of the direction that will represent with the arrow F of Figure 11; The regulation above-below direction is come in the act as a fuel top of jet pump 201 of the direction that will represent with the arrow U of Figure 11, and the regulation left and right directions is come on act as a fuel jet pump 201 right-hand of the direction that will represent with the arrow R of Figure 12.
Fuel-injection pump 201 is the structure members that are installed in the fuel injection system of DENG, after the fuel that provides from fuel tank is pressurizeed, in predetermined timing with the fuel of established amount through the injection pipe force feed to Fuelinjection nozzle.Like Figure 11 and shown in Figure 12, fuel-injection pump 201 is the distribution type fuel-injection pumps with fuel distribution/force feed to a plurality of Fuelinjection nozzles.
In fuel-injection pump 201, plunger 210 can up and down reciprocatingly be slidingly arranged in the plunger guide bush 211.Plunger guide bush 211 is inserted in the fluid head 213 on the top that is arranged on pump case 212.And, between the upper end portion of plunger 210 and plunger guide bush 211, be formed with pressurized chamber 214.In addition, in fluid head 213, at the right-hand thermocouple 215 that becomes the cold-starting time movement that is provided with of plunger guide bush 211.On the other hand, the left at plunger guide bush 211 is provided with accumulator 238.
The underpart of plunger guide bush 211 is inserted in the tappet chamber 121 on the top that is formed at pump case 212.Plunger 210 is given prominence to downwards towards tappet chamber 121 from the underpart of plunger guide bush 211.Lower, outer perimeter at plunger guide bush 211 is set with upper springs support 216.Be set with lower springs support 217 in the underpart of plunger 210.These upper springs supports 216 and lower springs support 217 up and down between be inserted with plunger 210 spring 218 of the application of force downwards.In addition, in the underpart of plunger 210 tappet 219 is arranged to and can be up and down reciprocatingly slided in tappet chamber 121.
Tappet 219 is to form the parts roughly cylindraceous that the end is arranged of opening up.Be provided with lower springs support 217 at tappet 219 internal fixation.Tappet 219 utilizes spring 218 to come through lower springs support 217 with plunger 210 by the application of force downwards.And roller 191 rotates the bottom that is supported on tappet 219 freely by axle through roll shaft 192.Cam 221 on roller 191 and the camshaft 220 connects.In addition, between about lower springs support 217 and the tappet 219, be provided with adjustment pad 222.Adjustment pad 222 is adjusted into desired value with the gap of cam 221 and tappet 219.
Cam 221 is fixedly installed on the camshaft 220, is housed in the front portion of the cam chamber 122 of the bottom that is formed at pump case 212.Camshaft 220 is erected in the cam chamber 122 along fore-and-aft direction, is supported in the pump case 212 by axle rotationally by bearing 240.Cam chamber 122 lubricated oil fill up.Through lubricant oil cam 211 drive components such as grade are lubricated.
In addition, be formed with flange 234 in the front portion of pump case 212.Gear-box 223 is installed on flange 234.Camshaft 220 from the front surface of flange 234 in gear-box 223 and forwards outstanding.Gear-box 223 is configured in the place ahead of pump case 212, the setting that links to each other with pump case 212, and be installed on the engine main body of DENG.In gear-box 223, cam wheel 224 is fixedly installed on the front end of camshaft 220.And, can be delivered to power transfer unit, camshaft 220 in the gear-box 223 through cam wheel 224 grades from the power of the bent axle of DENG.
On the other hand, camshaft 220 is rearward outstanding from the rear portion of pump case 212.Outside pump case 212, be provided with the governor sleeve 225 and governor weight 226 of the parts of conduct formation governor mechanism in the rearward end of camshaft 220.Governor mechanism is installed in the speed regulator chamber 125 of the rear side that is formed at pump case 212.And speed regulator chamber 125 and cam chamber 122 are communicated with through vent.
In addition, contain the bevel gear 227 that is fixedly installed on the camshaft 220 at the rear portion of cam chamber 122.This bevel gear 227 is fixedly installed on the camshaft 220.And passing shaft 228 is given prominence to downwards towards cam chamber 122 from the upper surface of cam chamber 122.Be set with bevel gear 229 in the underpart of passing shaft 228.Bevel gear 229 is meshed with bevel gear 227 on the camshaft 220.Passing shaft 228 sets up at above-below direction, is supported on the pump case 212 by axle rotationally.The position of the above-below direction of passing shaft 228 (axle direction) is fixed by bridle 230.
And, in pump case 212, above passing shaft 228, be formed with tooth bar chamber 124.Tooth bar as the parts of the emitted dose controlling mechanism that constitutes fuel-injection pump 201 is installed in the tooth bar chamber 124.Tooth bar chamber 124 and cam chamber 122 are communicated with through vent.
In addition, through shaft coupling 232 distribution shaft 231 and passing shaft 228 coaxial hearts are fixedly installed on the upper end portion of passing shaft 228.And, in fluid head 213, be provided with delivery valve 233 through supporting member 331 at the rear of distribution shaft 231.Delivery valve 233 prevents that the fuel in the injection pipe flow into pressurized chamber 214 when fuel-injection pump 201 sprays end.
According to this structure; In fuel-injection pump 201; When cam 221 rotation, the rotation through cam 221 pumps tappet 219, and plunger 210 also pumps by the lower springs support 217 that is fixedly installed on this tappet 219.And, by pumping of plunger 210, come alternately to carry out to pressurized chamber 214 suck the suction stroke of fuel and from the pressurized chamber 214 discharge fuel the discharge stroke.That is to say; In suction stroke, when plunger 210 is pressed when descending through spring 218 application of forces, be inhaled into pressurized chamber 214 from the fuel of fuel tank; On the other hand; In discharging stroke, when plunger 210 is brought to when rising through spring 218 application of forces, the fuel that is drawn into pressurized chamber 214 is pressurized and through oil circuit force feed to distribution shaft 231.Afterwards, distributed to delivery valve 233 through distribution shaft 231, go out from fuel injection valves inject through injection pipe by the fuel of force feed to distribution shaft 231.
Figure 13 and flange 234 shown in Figure 14 are roughly upside-down triangle shape when forming and seeing in the front.Be provided with the hub portion 341 of axle supporting camshaft 220 at the central part of flange 234.And the front surface of hub portion 341 is provided with slot part 342.Cover 251 is configured to cover from gear-box 223 sides the opening of slot part 342, is installed in the hub portion 341 through bolt 236,236.
In addition, be provided with three bolts hole 343,343,343, be used for the bolt that pump case 212 is installed on the gear-box 223 is inserted into this three bolts hole 343,343,343 at the peripheral part of flange 234.These three bolts hole 343,343,343 are configured in respectively and form roughly three bights of the flange 234 of upside-down triangle shape, are the center with hub portion 341, with the interval setting of angle (roughly 120 degree) about equally.
And flange 234 is provided with two lubricant oil drain passageway 370L, 370R.Each lubricant oil drain passageway 370L, 370R make in the pump case 212 with in the gear-box 223 and are connected.Lubricant oil is discharged in the gear-box 223 from the cam chamber 122 in the pump case 212 through each lubricant oil drain passageway 370L, 370R.In addition, in the explanation below relevant, on the flow direction of lubricant oil, pump case 212 sides are called " upstream side ", gear-box 223 sides are called " downstream side " with lubricant oil drain passageway 370L, 370R.
Shown in Figure 19 (a) and Figure 19 (b), two lubricant oil drain passageway 370L, 370R form and when section is seen, are bent into roughly crank-like.Two lubricant oil drain passageway 370L, 370R clip camshaft 220 respectively when seeing (with reference to Figure 13) in the front and are configured in about it.That is to say; The left of camshaft 220 configuration lubricant oil drain passageway 370L (below abbreviate " the lubricant oil drain passageway 370L of left " as), the right-hand configuration lubricant oil drain passageway 370R of camshaft 220 (below abbreviate " right-hand lubricant oil drain passageway 370R " as).
The lubricant oil drain passageway 370L of left is made up of the first lubricant oil drain passageway 371L, the second lubricant oil drain passageway 372L and the 3rd lubricant oil drain passageway 373L.In the lubricant oil drain passageway 370L of left; Be arranged at the second lubricant oil drain passageway 372L on the front surface of hub portion 341 upstream side and with this second lubricant oil drain passageway 372L roughly the first lubricant oil drain passageway 371L of quadrature be communicated with, the downstream side of the second lubricant oil drain passageway 372L and with this second lubricant oil drain passageway 372L roughly the 3rd lubricant oil drain passageway 373L of quadrature be communicated with.
On the other hand, right-hand lubricant oil drain passageway 370R is made up of the first lubricant oil drain passageway 371R, the second lubricant oil drain passageway 372R and the 3rd lubricant oil drain passageway 373R.In right-hand lubricant oil drain passageway 370R; Be arranged at the second lubricant oil drain passageway 372R on the front surface of hub portion 341 upstream side and with this second lubricant oil drain passageway 372R roughly the first lubricant oil drain passageway 371R of quadrature be communicated with, the downstream side of the second lubricant oil drain passageway 372R and with this second lubricant oil drain passageway 372R roughly the 3rd lubricant oil drain passageway 373R of quadrature be communicated with.
In addition, shown in figure 15, slot part 342 extends along the circumferencial direction of hub portion 341, sees in the front of left opening forming the part that cuts annulus when the front is seen to be roughly the C shape.Slot part 342 is opening forwards.Be separated into the first slot part 342A, the second slot part 342B, the 3rd slot part 342C by the next door in the slot part 342.About these first to the 3rd each slot part 342A, 342B, 342C, the position relation in slot part 342 as follows.
Specifically, forming the front when seeing roughly in the slot part 342 of C word shape, the first slot part 342A is positioned at opening one end (upper end portion) of slot part 342.The 3rd slot part 342C is positioned at opening the other end (underpart) of slot part 342.The second slot part 342B is between the first slot part 342A and the 3rd slot part 342C.In other words, the first slot part 342A is positioned at the top of hub portion 341 peripheries.Sidepiece, this mode of execution that the second slot part 342B is arranged in hub portion 341 peripheries are the right sides of hub portion 341 peripheries.The 3rd slot part 342C is positioned at the lower, outer perimeter of hub portion 341.
In addition, in slot part 342, be provided with pair of bolts hole 344,345.Pair of bolts hole 344,345 all is the hole that confession is used for bolt 236,236 (with reference to Figure 13 and Figure 14) insertion of mounting cup 251, is arranged to run through flange 234 along fore-and-aft direction.A bolt hole 344 in the pair of bolts hole 344,345 is arranged in the first slot part 342A, specifically is arranged on the left and right sides substantial middle portion in the first slot part 342A, and another bolt hole 345 is arranged in the 3rd slot part 342C.And the center that pair of bolts hole 344,345 is configured to hub portion 341 is a roughly symmetry (line symmetry) of benchmark.
Outward edge at slot part 342 is provided with a pair of recess 342D, 342E.A pair of recess 342D, 342E form with the mode that the outward edge with slot part 342 cuts.A pair of recess 342D, 342E for example through the outward edge of the slot part 342 of pruning, can easily process.A recess 342D among a pair of recess 342D, the 342E is arranged on the outward edge of the first slot part 342A, and another recess 342E is arranged on the outward edge of the 3rd slot part 342C.And the center that a pair of recess 342D, 342E are configured to hub portion 341 is a roughly symmetry (axisymmetric) of benchmark.And a pair of recess 342D, 342E and pair of bolts hole 344,345 are configured on the line (diameter) through the center of hub portion 341.
In the first slot part 342A, be provided with the first lubricant oil drain passageway 371L of the upstream side path of the lubricant oil drain passageway 370L that constitutes left at the left of bolt hole 344.In addition, in the second slot part 342B, be provided with the first lubricant oil drain passageway 371R of the upstream side path that constitutes right-hand lubricant oil drain passageway 370R in the end of the first slot part 342A side.
Shown in Figure 19 (a), the first lubricant oil drain passageway 371L is by 234 intercommunicating pore constitutes along fore-and-aft direction through flange.The upstream-side-end of the first lubricant oil drain passageway 371L is connected with the cam chamber 122 of pump case 212 (with reference to Figure 11 and Figure 12).Be connected in the end of downstream side of the first lubricant oil drain passageway 371L and the first slot part 342A.When being installed in fuel injection system in the DENG, the horizontal line in the axle center through camshaft 220 when the first lubricant oil drain passageway 371L is configured in and sees than the front of fuel-injection pump 1 leans on the position of top, or be configured to make the underpart to be positioned at the position of the height of above-mentioned degree with respect to above-mentioned horizontal line.Be the substantially elliptical shape when in addition, the hole shape of the first lubricant oil drain passageway 371L is seen in the front.The hole width of the first lubricant oil drain passageway 371L (length of oval short side direction) is roughly consistent with the well width of the first slot part 342A.In addition, below, the area of passage of representing the first lubricant oil drain passageway 371L with AL1 is (with the flow direction of the lubricant oil sectional area of the direction of quadrature mutually.Also identical below).
Shown in Figure 19 (b), the first lubricant oil drain passageway 371R is made up of the intercommunicating pore that runs through flange 234 along fore-and-aft direction.The upstream-side-end of the first lubricant oil drain passageway 371R is connected with the cam chamber 122 of pump case 212 (with reference to Figure 11 and Figure 12).Be connected in the end of downstream side of the first lubricant oil drain passageway 371R and the second slot part 342B.When being installed in fuel injection system in the DENG, the horizontal line in the axle center through camshaft 220 when the first lubricant oil drain passageway 371R is configured in and sees than the front of fuel-injection pump 1 leans on the position of top, or be configured to make the underpart to be positioned at the position of the height of above-mentioned degree with respect to above-mentioned horizontal line.Be the substantially elliptical shape when in addition, the hole shape of the first lubricant oil drain passageway 371R is seen in the front.The hole width of the first lubricant oil drain passageway 371R (length of oval short side direction) is roughly consistent with the well width of the first slot part 342A.In addition, below, the area of passage of the first lubricant oil drain passageway 371R represented with AR1.
In addition, to shown in Figure 180, cover 251 is plate-shaped members of C word shape roughly like Figure 13, Figure 16, with the state configuration of left opening on the slot part 342 of flange 234.Cover 251 is by a plurality of recesses with first mounting plate 351 or second mounting plate 352 and has left access panels 353 or platy structure that a plurality of planar surface portion of right-hand access panels 354 constitute.Cover 251 is provided with pair of bolts hole 351A, 352A, a pair of protuberance 351B, 352B.
In forming the cover 251 of C word shape roughly, opening one end (upper end portion) of cover 251 is a left access panels 353.On this left access panels 353, link to each other and be provided with first mounting plate 351.On the other hand, opening the other end (underpart) of cover 251 is second mounting plate 352.On this second mounting plate 352, link to each other and be provided with right-hand access panels 354.And; In cover 251; First mounting plate 351 and second mounting plate 352 are configured on the same plane (Z1 shown in Figure 180), and left access panels 353 and right-hand access panels 354 are configured on the same plane (Z2 shown in Figure 180) different with plane Z1 with plane Z1 almost parallel and height.
Also shown in figure 13, the width of first mounting plate 351 constitutes the well width that is slightly smaller than in the first slot part 342A.That is to say that first mounting plate 351 constitutes and is entrenched in the first slot part 342A.And, the back surface of first mounting plate 351 (leaning on the face of flange 234 sides) bottom surface along the first slot part 342A is constituted (front surface of flange 234).In addition, first mounting plate 351 is provided with a bolt hole 351A among pair of bolts hole 351A, the 352A.This bolt hole 351A is the hole of running through first mounting plate 351, makes bolt 236 through bolt hole 351A, and runs through the bolt hole 344 in the first slot part 342A.In addition, the outward edge at first mounting plate 351 is provided with a protuberance 351B among a pair of protuberance 351B, the 352B.This protuberance 351B is the part that is projected into the outside from the outward edge end of first mounting plate 351, constitutes among the recess 342D that is entrenched in the first slot part 342A.
The width of second mounting plate 352 constitutes and is slightly smaller than the inboard well width of the 3rd slot part 342C.That is to say that second mounting plate 352 constitutes and is entrenched in the 3rd slot part 342C.And, the bottom surface along the second slot part 342B, the back surface (faces of flange 234 sides) of second mounting plate 352 is constituted (front surface of flange 234).In addition, second mounting plate 352 is provided with another bolt hole 352A among pair of bolts hole 351A, the 352A.This bolt hole 352A is the hole of running through second mounting plate 352, makes bolt 236 through bolt hole 352A, and the bolt hole 345 in the 3rd slot part 342C.In addition, the outward edge at second mounting plate 352 is provided with another protuberance 352B among a pair of protuberance 351B, the 352B.This protuberance 352B is the part that is projected into the outside from the outward edge end of second mounting plate 352, constitutes among the recess 342E that is entrenched in the 3rd slot part 342C.
And left access panels 353 is to make opening one end (upper end portion) of cover 251 with the bending of first mounting plate, 351 almost parallel ground formation (with reference to Figure 18).The width of left access panels 353 is configured to be a bit larger tham the inboard well width of the first slot part 342A.That is to say that left access panels 353 constitutes and can cover the first slot part 342A from gear-box 223 sides.Thus, like Figure 19 (a) and shown in Figure 20, through the first slot part 342A and left access panels 353 constituted the sectional area with regulation path, be the second lubricant oil drain passageway 372L of left.
In addition, the area of passage of representing the second lubricant oil drain passageway 372L below with AL2.And the area of passage AL2 of the second lubricant oil drain passageway 372L is less than the area of passage AL1 of the first lubricant oil drain passageway 371L (AL2＜AL1).
The upstream-side-end of the second lubricant oil drain passageway 372L is connected with the first lubricant oil drain passageway 371L.The end of downstream side of the second lubricant oil drain passageway 372L is connected with the 3rd lubricant oil drain passageway 373L.In addition, the duct width of the second lubricant oil drain passageway 372L is roughly consistent with the A/F (oval minor face) at the upstream-side-end place and the first lubricant oil drain passageway 371L on the radial direction of hub portion 341.End of downstream side at the second lubricant oil drain passageway 372L is formed with narrow part 372La.The duct width of the duct width of narrow part 372La (well width that the first slot part 342A is inboard) than upstream-side-end on the radial direction of hub portion 341 is narrow.
Shown in Figure 19 (a), the 3rd lubricant oil drain passageway 373L is made up of the through hole of the left access panels 353 that runs through cover 251.The 3rd lubricant oil drain passageway 373L is the breach hole, along the outward edge end face 353A ground formation of cover 251 left access panels 353.Specifically, the gap that produces between the inner peripheral surface of the 3rd lubricant oil drain passageway 373L by the outward edge end face 353A of left access panels 353 and the first slot part 342A (narrow part 372La) constitutes.Outward edge end face 353A is the end face of cover 251 open front portion, constitutes cross-section (direction of intersecting with the flow direction of lubricant oil) first slot part 342A.And the upstream-side-end of the 3rd lubricant oil drain passageway 373L is connected with the second lubricant oil drain passageway 372L.The end of downstream side of the 3rd lubricant oil drain passageway 373L is open in the face side of flange 234, and is connected in the gear-box 223.That is to say that the 3rd lubricant oil drain passageway 373L forms communication paths with the second lubricant oil drain passageway 372L, in the outside of flange 234 makes gear-box 223, be connected with the first lubricant oil drain passageway 371L.In addition, the 3rd lubricant oil drain passageway 373L is arranged on than the first lubricant oil drain passageway 371L and leans on the position of below.
In addition, the area of passage of representing the 3rd lubricant oil drain passageway 373L below with AL3.And the area of passage AL3 of the 3rd lubricant oil drain passageway 373L is less than the area of passage AL1 of the first lubricant oil drain passageway 371L (AL3＜AL1).And the area of passage AL3 of the 3rd lubricant oil drain passageway 373L is less than the area of passage AL2 of the second lubricant oil drain passageway 372L (AL3＜AL2).That is to say that in the lubricant oil drain passageway 370L of left, the area of passage AL3 of the 3rd lubricant oil drain passageway 373L is minimum, and the area of passage AL1 maximum of the first lubricant oil drain passageway 371L (AL3＜AL2＜AL1).In other words, the lubricant oil drain passageway 370L of the left area of passage that constitutes three lubricant oil drain passageway 371L, 372L, 373L from upstream side downstream side, promptly diminish gradually from pump case 212 side direction gear-boxes 223 sides.
And right-hand access panels 354 makes first mounting plate 351 on the cover 251 and the part between second mounting plate 352 bends and right-hand access panels 354 is formed and first mounting plate 351 and second mounting plate, 352 almost parallels (with reference to Figure 18).The width setup of right-hand access panels 354 becomes to be a bit larger tham the well width of the second slot part 342B.That is to say that right-hand access panels 354 constitutes and can cover the second slot part 342B from gear-box 223 sides.Thus, like Figure 19 (b) and shown in Figure 20, through the second slot part 342B and right-hand access panels 354 constituted the sectional area with regulation path, be the second right-hand lubricant oil drain passageway 372R.
In addition, the area of passage of representing the second lubricant oil drain passageway 372R below with AR2.And the area of passage AR2 of the second lubricant oil drain passageway 372R is less than the area of passage AR1 of the first lubricant oil drain passageway 371R (AR2＜AR1).
The upstream-side-end of the second lubricant oil drain passageway 372R is connected with the first lubricant oil drain passageway 371R, and the end of downstream side of the second lubricant oil drain passageway 372R is connected with the 3rd lubricant oil drain passageway 373R.In addition, the duct width of the second lubricant oil drain passageway 372R is roughly consistent with the A/F (oval minor face) of the first lubricant oil drain passageway 371R at the upstream-side-end place on the radial direction of hub portion 341.Middle reaches portion at the second lubricant oil drain passageway 372R is formed with narrow part 372Ra.The duct width of the duct width of narrow part 372Ra (well width that the second slot part 342B is inboard) than upstream-side-end on the radial direction of hub portion 341 is narrow.
Shown in Figure 19 (b), the 3rd lubricant oil drain passageway 373R is made up of the through hole of the right-hand access panels 354 that runs through cover 251.The hole shape of the 3rd lubricant oil drain passageway 373R is the circular shape.And the upstream-side-end of the 3rd lubricant oil drain passageway 373R is connected with the second lubricant oil drain passageway 372R.The end of downstream side of the 3rd lubricant oil drain passageway 373R is open in the face side of flange 234, and is connected in the gear-box 223.That is to say that the 3rd lubricant oil drain passageway 373R forms communication paths with the second lubricant oil drain passageway 372R, in the outside of flange 234 makes gear-box 223, be connected with the first lubricant oil drain passageway 371R.The 3rd lubricant oil drain passageway 373R is arranged on than the first lubricant oil drain passageway 371R and leans on the position of below.In other words, the 3rd lubricant oil drain passageway 373R is arranged on and covers the end of the side opposition side of the first lubricant oil drain passageway 371R on right-hand access panels 354.
In addition, the area of passage of representing the 3rd lubricant oil drain passageway 373R below with AR3.And the area of passage AR3 of the 3rd lubricant oil drain passageway 373R is less than the area of passage AR1 of the first lubricant oil drain passageway 371R (AR3＜AR1).And the area of passage AR3 of the 3rd lubricant oil drain passageway 373R is less than the area of passage AR2 of the second lubricant oil drain passageway 372R (AR3＜AR2).That is to say that in right-hand lubricant oil drain passageway 370R, the area of passage AR3 of the 3rd lubricant oil drain passageway 373R is minimum, and the area of passage AR1 maximum of the first lubricant oil drain passageway 371R (AR3＜AR2＜AR1).In other words, the right-hand lubricant oil drain passageway 370R area of passage that constitutes three lubricant oil drain passageway 371R, 372R, 373R from upstream side downstream side, promptly diminish gradually from pump case 212 side direction gear-boxes 223 sides.
As stated, fuel injection portion 201 is installed to gear-box 223 on the flange 234 of pump case 212, will be inserted in the gear-box 223 from flange 234 outstanding camshafts 220.Fuel injection portion 201 is arranged on cam wheel 224 on the camshaft 220 in gear-box 223; Lubricant oil drain passageway 370L, 370R are arranged on the flange 234, and this lubricant oil drain passageway 370L, 370R are discharged to the lubricant oil in the pump case 212 in the gear-box 223.And; In this fuel injection portion 201; Lubricant oil drain passageway 370L, 370R are bent into roughly crank-like ground formation, are made up of the first lubricant oil drain passageway 371L, 371R, the second lubricant oil drain passageway 372L (372R) and the 3rd lubricant oil drain passageway 373L, 373R.The second lubricant oil drain passageway 372L, 372R are arranged on the side of flange 234 of pump case 212.The first lubricant oil drain passageway 371L, 371R and the second lubricant oil drain passageway 372L, 372R be quadrature roughly, is connected with the upstream side of the second lubricant oil drain passageway 372L, 372R.The 3rd lubricant oil drain passageway 373L, 373R and the second lubricant oil drain passageway 372L, 372R be quadrature roughly, is connected with the downstream side of the second lubricant oil drain passageway 372L, 372R.The slot part 342 that constitutes the part of lubricant oil drain passageway 370L, 370R is arranged on the side of flange 234 of pump case 212.The first lubricant oil drain passageway 371L, 371R are the holes of in slot part 342, running through the flange 234 of pump case 212.Be connected in the upstream-side-end of the first lubricant oil drain passageway and the pump case 212.Be connected in the end of downstream side of the first lubricant oil drain passageway 371L, 371R and the slot part 342, quilt cover 251 covers.The second lubricant oil drain passageway 372L, 372R are by slot part 342 and cover 251 and constitute.The 3rd lubricant oil drain passageway 373L, 373R constitute along the end face of cover 251.And the area of passage AL3 of the area of passage AL2 of the second lubricant oil drain passageway 372L, 372R, AR2 and the 3rd lubricant oil drain passageway 373L, 373R, AR3 are respectively less than the first lubricant oil drain passageway 371L, the area of passage AL1 of 371R, AR1.
Thus, the cam chamber 122 of lubricant oil in the pump case 212 is discharged in the gear-box 223 via the first lubricant oil drain passageway 371L, 371R, the second lubricant oil drain passageway 372L, 372R, the 3rd lubricant oil drain passageway 373L, 373R successively.And, lubricant oil drain passageway 370L, 370R in the area of passage of gear-box 223 sides less than the area of passage in pump case 212 sides, thereby lubricant oil accumulates in the 3rd lubricant oil drain passageway 373L, 373R place easily.Therefore, along with the fluctuation pressure that produces that moves up and down of the piston of DENG decays through the lubricant oil that accumulates in the 3rd lubricant oil drain passageway 373L, 373R, be not easy to be sent to pump case 3 from gear-box 223 sides.Thereby fuel injection portion 201 can reduce the spittle amount of the lubricant oil in the pump case 3, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
Fuel injection portion 201 makes the area of passage AL3, AR3 of the 3rd lubricant oil drain passageway 373L, 373R less than the second lubricant oil drain passageway 372L, the area of passage AL2 of 372R, AR2.
Thus, lubricant oil drain passageway 370L, 370R diminish towards gear-box 223 sides in the area of passage of gear-box 223 sides gradually, so lubricant oil accumulates among the 3rd lubricant oil drain passageway 373L, the 373R easily.Therefore, the fluctuation pressure that produces along with moving up and down of the piston of DENG is not easy to be sent to pump case 3 from gear-box 223 sides owing to the lubricant oil that accumulates in the 3rd lubricant oil drain passageway 373L, 373R is decayed.Thereby fuel injection portion 201 can reduce the spittle amount of the lubricant oil in the pump case 3, suppresses because lubricant oil the sneaking into to fuel that the spittle of lubricant oil produces.
And,, just can easily adjust the area of passage of lubricant oil drain passageway 370L (370R) as long as process to covering 251 end face.Thereby, the processing cost of lubricant oil drain passageway 370L (370R) can be reduced, and the manufacture cost of fuel injection portion 201 can be reduced.
The 3rd lubricant oil drain passageway 373L, 373R are arranged on than the first lubricant oil drain passageway 371L, 371R by on the position of below.
Thus, when in pump case 212, being discharged to lubricant oil in the gear-box 223, lubricant oil in lubricant oil drain passageway 370L, 370R from above flow down downwards.Thereby, can be lubricated the discharge of oil smoothly, thereby improve greasy property.
Cover 251 is provided with protuberance 351B, 352B, thus fuel injection portion 201 should cover 251 and can be installed on the pump case 3 with locating, this protuberance 351B, 352B can be entrenched among recess 342D on the flange 234 that is formed at pump case 212, the 342E.
Thus, the installation exercise of cover 251 becomes easy.Thereby fuel injection portion 201 constitutes the assembling operation that can carry out fuel-injection pump efficiently.
That is to say; Fuel injection portion 201 will cover 251 be installed to pump case 212 234 last times of flange; To be entrenched in a pair of recess 342D, the 342E of flange 234 respectively last through covering 251 a pair of protuberance 351B, 352B, can cover 251 easily be positioned on the flange 234 (slot part 342).
And; Protuberance 351B is arranged on the outward edge on first mounting plate 351; On the other hand, protuberance 352B is arranged on the front end outward edge (in other words, protuberance 351B and protuberance 352B are arranged to the center with hub portion 341 be that benchmark is asymmetric) of second mounting plate 352; Therefore when assembling, can easily discern the mounting point of cover 251.Thus, can be with a pair of protuberance 351B, 352B is errorless and easily be entrenched in a pair of recess 342D respectively, 342E is last, the installation exercise of cover 251 is become be more prone to.
Industrial applicibility
The present invention can be used in the fuel-injection pump of the fuel injection system that is installed in DENG.
Description of reference numerals
1: fuel-injection pump; 2: fluid head; 3: pump case; 3a: flange; 3i: the first lubricant oil tap hole (intercommunicating pore); 3j: the second lubricant oil tap hole (intercommunicating pore); 3n: first communication paths; 3m: second communication paths; 3p: lubricant oil accumulates portion; 28: prevention portion; 50: gear-box; 60: cover; 60d: tap hole (through hole); 60h: tap hole (through hole); 70d: tap hole (through hole); 103a: flange; 103i: lubricant oil tap hole (intercommunicating pore); 103n: communication paths; 103p: lubricant oil accumulates portion; 201: fuel-injection pump; 212: pump case; 220: camshaft; 223: gear-box; 224: cam wheel; 234: lip part; 235: cover; 370L: the lubricant oil drain passageway of left; 370R: right-hand lubricant oil drain passageway; 342: slot part; 342D: recess; 342E: recess; 351B: protuberance; 352B: protuberance; 371L: the first lubricant oil drain passageway of left; 371R: the first right-hand lubricant oil drain passageway; 372L: the second lubricant oil drain passageway of left; 372R: the second right-hand lubricant oil drain passageway; 373L: the 3rd lubricant oil drain passageway of left; 373R: the 3rd right-hand lubricant oil drain passageway.

Claims (8)

1. fuel-injection pump, it possesses the pump case that links to each other and be provided with gear-box, wherein,
Above-mentioned pump case possesses:
Intercommunicating pore, it is with being communicated with in this pump case with in the said gear case;
Slot part, it is connected with this intercommunicating pore; And
The cover, it is installed on the above-mentioned pump case, from said gear case side cover above-mentioned slot part a part and above-mentioned intercommunicating pore,
Constitute in the above-mentioned pump case and the communication paths of the bending shape that is communicated with in the said gear case by above-mentioned intercommunicating pore, above-mentioned slot part and above-mentioned cover.
2. fuel-injection pump according to claim 1 wherein, is formed with the through hole of a part that constitutes above-mentioned communication paths on above-mentioned cover, with this through hole be configured to respect to above-mentioned intercommunicating pore over against the position stagger.
3. fuel-injection pump according to claim 1 and 2, wherein, above-mentioned communication paths midway and between above-mentioned pump case and above-mentioned cover, be provided with the lubricant oil that can accumulate lubricant oil and accumulate portion.
4. according to each described fuel-injection pump in the claim 1 to 3; Wherein, on above-mentioned pump case, be formed with the cam chamber of taking in cam, and be formed with the tappet chamber with the mode that is connected with above-mentioned cam chamber; Has taken in and the contacted tappet of above-mentioned cam this tappet chamber
The above-mentioned tappet of ratio in above-mentioned cam chamber and above-mentioned tappet chamber leans on and is formed with the prevention portion that stops them to be connected between the position of plunger side.
5. fuel-injection pump according to claim 2; Wherein, Above-mentioned intercommunicating pore is used as the first lubricant oil drain passageway; Above-mentioned through hole is used as the 3rd lubricant oil drain passageway; With above-mentioned communication paths except above-mentioned intercommunicating pore and the part the above-mentioned through hole as the second lubricant oil drain passageway, be configured for lubricant oil drain passageway that lubricant oil is discharged in above-mentioned gear-box via the above-mentioned first lubricant oil drain passageway, the above-mentioned second lubricant oil drain passageway, above-mentioned the 3rd lubricant oil drain passageway in the above-mentioned pump case successively with this
The area of passage of the area of passage and above-mentioned the 3rd lubricant oil drain passageway that makes the above-mentioned second lubricant oil drain passageway is respectively less than the area of passage of the above-mentioned first lubricant oil drain passageway.
6. fuel-injection pump according to claim 5 wherein, makes the area of passage of the area of passage of above-mentioned the 3rd lubricant oil drain passageway less than the above-mentioned second lubricant oil drain passageway.
7. according to claim 5 or 6 described fuel-injection pumps, wherein, the position below leaning on than the above-mentioned first lubricant oil drain passageway is provided with above-mentioned the 3rd lubricant oil drain passageway.
8. according to each described fuel-injection pump in the claim 1 to 7; Wherein, Above-mentioned cover is provided with recess or protuberance, can be installed on the above-mentioned pump case thereby should cover with locating, this recess or protuberance can with the protuberance or the recess tabling that are formed on the above-mentioned pump case.
CN201080017364.0A 2009-04-20 2010-04-16 Fuel injection pump Active CN102405345B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2009102513A JP5255506B2 (en) 2009-04-20 2009-04-20 Fuel injection pump
JP2009-102513 2009-04-20
JP2009-217565 2009-09-18
JP2009217565A JP5350155B2 (en) 2009-09-18 2009-09-18 Fuel injection pump
PCT/JP2010/056868 WO2010122963A1 (en) 2009-04-20 2010-04-16 Fuel injection pump

Publications (2)

Publication Number Publication Date
CN102405345A true CN102405345A (en) 2012-04-04
CN102405345B CN102405345B (en) 2013-10-02

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Publication number Priority date Publication date Assignee Title
JP5886104B2 (en) * 2012-03-28 2016-03-16 ヤンマー株式会社 Fuel injection pump

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JPS6180364U (en) * 1984-10-31 1986-05-28
JPS63201308A (en) * 1987-02-17 1988-08-19 Honda Motor Co Ltd Diesel engine
JP2005146984A (en) * 2003-11-14 2005-06-09 Yanmar Co Ltd Fuel injection pump
CN1703578A (en) * 2002-10-29 2005-11-30 株式会社博世汽车系统 Fuel supply pump and tappet structure body
CN101137837A (en) * 2005-03-09 2008-03-05 卡特彼勒公司 High pressure pump and method of reducing fluid mixing within same
JP2008106780A (en) * 2007-12-04 2008-05-08 Yanmar Co Ltd Fuel injection pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180364U (en) * 1984-10-31 1986-05-28
JPS63201308A (en) * 1987-02-17 1988-08-19 Honda Motor Co Ltd Diesel engine
CN1703578A (en) * 2002-10-29 2005-11-30 株式会社博世汽车系统 Fuel supply pump and tappet structure body
JP2005146984A (en) * 2003-11-14 2005-06-09 Yanmar Co Ltd Fuel injection pump
CN101137837A (en) * 2005-03-09 2008-03-05 卡特彼勒公司 High pressure pump and method of reducing fluid mixing within same
JP2008106780A (en) * 2007-12-04 2008-05-08 Yanmar Co Ltd Fuel injection pump

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KR101639674B1 (en) 2016-07-14
WO2010122963A1 (en) 2010-10-28
KR20120004522A (en) 2012-01-12

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