WO2010095247A1 - 高圧燃料供給ポンプ及びそれに用いる吐出弁ユニット - Google Patents
高圧燃料供給ポンプ及びそれに用いる吐出弁ユニット Download PDFInfo
- Publication number
- WO2010095247A1 WO2010095247A1 PCT/JP2009/053077 JP2009053077W WO2010095247A1 WO 2010095247 A1 WO2010095247 A1 WO 2010095247A1 JP 2009053077 W JP2009053077 W JP 2009053077W WO 2010095247 A1 WO2010095247 A1 WO 2010095247A1
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- WIPO (PCT)
- Prior art keywords
- valve
- valve body
- discharge
- fuel supply
- pressure fuel
- Prior art date
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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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/462—Delivery valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0054—Check valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7738—Pop valves
Definitions
- the present invention relates to a high-pressure fuel supply pump for supplying fuel to an engine at a high pressure and a discharge valve unit used therefor, and particularly to a high-pressure fuel supply pump suitable for preventing fluttering of the discharge valve and a discharge valve unit used therefor.
- a valve structure provided with a buffer portion for buffering the pressure of hydraulic fluid after passing through the discharge port is known.
- a valve structure provided with a buffer portion for buffering the pressure of hydraulic fluid after passing through the discharge port.
- valve seat is formed in a tapered shape so that the direction change of the discharge flow flowing from the valve seat to the discharge port is small and flows smoothly, and a conical portion seated on the valve seat is provided in the valve body.
- a known valve structure is known (see, for example, Patent Document 2).
- the flow that collides with the valve body from the axial direction when the valve is opened is radially dispersed in the radial direction of the valve body.
- the flow in the range where the discharge port is formed becomes the flow in the radial direction of the valve body as it is toward the discharge port.
- the flow toward the range where the discharge port is not formed becomes a flow in the circumferential direction of the valve body toward the discharge port after colliding with the inner wall of the valve housing.
- a ball valve using a spherical valve body can obtain a relatively large flow rate even if the valve body moves in a small axial direction.
- the relationship becomes non-linear.
- the relationship between the axial movement amount of the valve body and the discharge amount is a straight line.
- the flat valve is such that the surface of the valve seat of the valve body is parallel to a plane perpendicular to the axial direction of the valve body, and the surface of the seat portion with which the valve body abuts is also in the axial direction of the valve body. It is parallel to an orthogonal plane.
- the valve described in Patent Document 1 is a flat valve.
- Fluttering is a vibration in the direction perpendicular to the opening / closing valve operating direction of the valve body.
- the fuel around the valve body is affected and pressure pulsation occurs.
- the pressure pulsation generated in this way is propagated and amplified through the piping system and is emitted to the outside as noise, which causes noise.
- An object of the present invention is to provide a high-pressure fuel supply pump equipped with a discharge valve capable of reducing the influence of noise caused by the flow in the circumferential direction of the valve body, and a discharge valve unit used therefor.
- the present invention provides a pressurizing chamber whose volume is changed by a reciprocating motion of a plunger, a discharge port for discharging fuel pressurized by the pressurizing chamber, A discharge valve that is provided between the pressurizing chambers and is a check valve, the discharge valve having a plurality of discharge ports that communicate with the discharge port, and the valve body housing A valve body that is biased in a direction to close the valve by a discharge valve spring, and a seat portion that is housed in the valve body housing and closes the valve in contact with the valve body.
- a high-pressure fuel supply pump comprising a seat member having a valve seat surface formed on the valve body and a surface of the seat portion parallel to a plane perpendicular to the axial direction of the valve body.
- a flat valve and when the valve is opened, the pressurizing chamber
- the flow of the fuel colliding with the valve body from the axial direction through the hollow portion of the seat member is radially dispersed in the radial direction of the valve body, and flows directly to the discharge port and on the inner wall of the valve housing.
- the flow toward the discharge port is a flow in the circumferential direction of the valve body, and is formed between the outer periphery of the seat member and the outer periphery of the valve body and the inner periphery of the valve housing.
- a room is provided.
- Such a configuration can reduce the influence of noise caused by the flow in the circumferential direction of the valve body.
- the liquid damper chamber includes a first tubular passage formed between an outer periphery of the valve body and an inner periphery of the valve housing, and an outer periphery of the sheet member. And a second tubular passage formed between the inner periphery of the valve housing.
- a cross-sectional area of the second tubular passage in a plane including the axis of the valve body is the same as that of the first tubular passage. It is larger than the cross-sectional area.
- the outer diameter of the valve body is larger than the outer diameter of the valve seat.
- the first tubular passage is formed between a taper provided on an outer periphery of the valve seat of the valve body and an inner periphery of the valve housing. is there.
- the sectional area ⁇ of the fluid passage is ⁇ > 0.1 ⁇ ⁇ with respect to the opening area ⁇ when the discharge valve is fully opened.
- the liquid damper chamber has a cross-sectional area in a plane including the axis of the valve body larger than 0.3 mm 2 .
- the present invention is used in a high-pressure fuel supply pump that discharges fuel pressurized by a pressurizing chamber from a discharge port via a discharge valve that is a check valve.
- a discharge valve unit that is press-fitted into a valve body housing constituting a part of the discharge valve, wherein the discharge valve unit is biased in a direction to close the valve by a discharge valve spring, and the valve body
- the discharge valve includes a seat member having a seat portion that closes the valve, and the surface of the valve seat formed on the valve body and the surface of the seat portion are orthogonal to the axial direction of the valve body.
- a liquid damper chamber for the flow is provided.
- Such a configuration can reduce the influence of noise caused by the flow in the circumferential direction of the valve body.
- FIG. 1 is an overall configuration diagram of a high-pressure fuel supply system using a high-pressure fuel supply pump according to a first embodiment of the present invention.
- FIG. A portion surrounded by a broken line indicates a pump housing 1 of the high pressure fuel supply pump, and a mechanism and parts shown in the broken line are integrally incorporated therein to constitute the high pressure fuel supply pump of the present embodiment. is doing. Moreover, in the figure, the dotted line has shown the flow of the electrical signal.
- the fuel in the fuel tank 20 is pumped up by the feed pump 21 and sent to the fuel inlet 10 a of the pump housing 1 through the suction pipe 28.
- the fuel that has passed through the fuel suction port 10a reaches the suction port 30a of the electromagnetic suction valve mechanism 30 constituting the variable capacity mechanism via the pressure pulsation reducing mechanism 9 and the suction passage 10c.
- the electromagnetic intake valve mechanism 30 includes an electromagnetic coil 30b. With the electromagnetic coil 30b energized, the electromagnetic plunger 30c compresses the spring 33 and moves to the right in FIG. 1, and this state is maintained. At this time, the suction valve body 31 attached to the tip of the electromagnetic plunger 30c opens the suction port 32 leading to the pressurizing chamber 11 of the high pressure fuel supply pump.
- the electromagnetic coil 30 b is not energized and there is no fluid differential pressure between the suction passage 10 c (suction port 30 a) and the pressurizing chamber 11, the suction valve body 31 is moved by the biasing force of the spring 33.
- the suction port 32 is urged in the valve closing direction (leftward in FIG. 3) to be closed, and this state is maintained.
- FIG. 1 shows a state where the suction port 32 is closed.
- the plunger 2 is slidably held in the pressurizing chamber 11 in the vertical direction of FIG.
- the volume of the pressurizing chamber 11 increases and the fuel pressure therein decreases.
- the suction valve body 31 has a valve opening force (suction valve body 31 shown in FIG. 1) is generated.
- the suction valve body 31 overcomes the urging force of the spring 33 and opens to open the suction port 32.
- the magnetic urging force acting on the electromagnetic plunger 30c is erased after a certain time (after the magnetic and mechanical delay time). Then, the suction valve body 31 moves to the left in FIG. 1 and closes the suction port 32 by the urging force of the spring 33 that is constantly working on the suction valve body 31 and the fluid force generated by the pressure loss of the suction port 32. .
- the suction port 32 is closed, the fuel pressure in the pressurizing chamber 11 rises with the rise of the plunger 2 from this time.
- the compression process of the plunger 2 includes a return process and a discharge process.
- the ECU 27 can control the amount of high-pressure fuel that is discharged by controlling the timing of releasing the energization of the electromagnetic coil 30 c of the electromagnetic intake valve mechanism 30. If the timing of releasing the energization to the electromagnetic coil 30b is advanced, the ratio of the return process in the compression process is reduced and the ratio of the discharge process is increased. That is, the amount of fuel returned to the suction passage 10c (suction port 30a) is reduced and the amount of fuel discharged at high pressure is increased. On the other hand, if the timing of releasing the energization is delayed, the ratio of the return process in the compression process is increased and the ratio of the discharge process is decreased. That is, more fuel is returned to the suction passage 10c and less fuel is discharged at high pressure. The timing for releasing the energization is controlled by a command from the ECU 27.
- the ECU 27 controls the timing of releasing the energization of the electromagnetic coil, so that the amount of fuel discharged at high pressure can be made the amount required by the internal combustion engine.
- a discharge valve 8 is provided on the outlet side of the pressurizing chamber 11 between the discharge port (discharge side pipe connection portion) 13.
- the discharge valve 8 includes a seat portion 8a, a valve body 8b, a discharge valve spring 8c, and a valve body housing 8d.
- the valve body 8b In a state where there is no fuel differential pressure between the pressurizing chamber 11 and the discharge port 13, the valve body 8b is pressed against the seat portion 8a by the urging force of the discharge valve spring 8c and is in a closed state.
- the valve body 8b opens against the discharge valve spring 8c, and the inside of the pressurizing chamber 11 The fuel is discharged to the discharge port 13 through the discharge valve 8.
- the stroke of the valve body 8b is appropriately determined by the valve body housing 8d. If the stroke is too large, the fuel discharged to the discharge port 13 flows back into the pressurizing chamber 11 again due to the delay in closing the valve body 8b, so that the efficiency of the high-pressure pump decreases. Further, the valve body 8b is guided by the inner wall 806 of the valve body housing 8d so as to smoothly move in the stroke direction when the valve body 8b repeats opening and closing movements. By configuring as described above, the discharge valve 8 becomes a check valve that restricts the flow direction of fuel. The detailed configuration of the discharge valve 8 will be described later with reference to FIGS.
- the fuel guided to the fuel suction port 10a is pressurized to a high pressure by the reciprocating motion of the plunger 2 in the pressurizing chamber 11 of the pump housing 1, and through the discharge valve 8, It is pumped from the discharge port 13 to a common rail 23 that is a high-pressure pipe.
- the common rail 23 is provided with an injector 24 and a pressure sensor 26.
- the injectors 24 are mounted according to the number of cylinders of the internal combustion engine, and the injectors 24 are opened and closed by a control signal from the ECU 27 to inject a predetermined amount of fuel into the cylinders.
- FIG. 2 and 3 are longitudinal sectional views showing the configuration of a discharge valve used in the high-pressure fuel supply pump according to the first embodiment of the present invention.
- the moving direction of the valve is taken as the Z axis
- the axes orthogonal to the Z axis are taken as the X axis and the Y axis, respectively.
- 2 is a longitudinal sectional view in the ZY plane
- FIG. 3 is a longitudinal sectional view in the ZX plane.
- 2 and 3 show the opened state of the discharge valve. 2 and 3, the same reference numerals as those in FIG. 1 denote the same parts.
- the discharge valve 8 includes the seat portion 8a, the valve body 8b, the discharge valve spring 8c, and the valve body housing 8d described with reference to FIG.
- the seat portion 8a, the valve body 8b, the discharge valve spring 8c, and the valve body housing 8d are all made of metal.
- the sheet portion 8a is formed at one end of the sheet member 8A.
- the valve body housing 8d and the seat member 8A are press-fitted into the metal pump housing 1 and fixed.
- the valve body 8b is slidably held inside the valve body housing 8d. In the figure, the Z-axis direction is the sliding direction of the valve body 8b.
- a discharge valve spring 8c is inserted between the valve body 8b and the valve body housing 8d.
- the discharge valve spring 8c urges the valve body 8b in the direction opposite to the fuel inflow direction.
- the pressurizing chamber 11 is provided inside the pump housing 1.
- the fuel pressurized in the pressurizing chamber 11 flows into the discharge valve 8 from the direction of the arrow A1. Therefore, the Z-axis direction is also the fuel inflow direction from the pressurizing chamber 11.
- the valve body 8b and the valve body housing 8d are cylindrical. As shown in FIG. 2, the valve body housing 8d is formed with two discharge ports 803A and 803B facing the side of the seat portion 8a. The fuel discharged from the discharge ports 803A and 803B flows out from the discharge port 13 of the pump housing 1 in the direction of arrow A2, and is supplied to the common rail 23 shown in FIG. Note that three or more discharge ports may be provided in the circumferential direction. On the outer periphery of the valve body housing 8d, as shown in FIG. 3, a guide peripheral surface 8d1 formed in the right direction from the center portion and a guide peripheral surface shown in FIG. A cut flat surface portion 8d2 and a flange portion 8d3 formed on the left side of the figure are formed.
- a circumferential stepped portion 1a with which the flange portion 8d3 of the valve body housing 8d abuts is formed on the inner peripheral surface of the pump housing 1.
- the valve body housing 8d is press-fitted into the pump housing 1 from the left side of the figure, and is positioned by the flange portion 8d3 of the valve body housing 8d coming into contact with the circumferential stepped portion 1a.
- a pressure equalizing hole 8d4 is formed on the right end surface of the valve body housing 8d.
- the pressure equalizing hole 8d4 is a hole for the fluid discharged into and out of the space on the back side of the valve body 8b in which the spring 8c is inserted.
- the discharge valve 8 can operate smoothly by receiving a differential pressure due to a pressure difference between the cylinder and the high-pressure pipe.
- a cylindrical guide portion 8d5 is formed on the inner periphery of the valve body housing 8d.
- a stepped portion 8d6 is formed on the right side of the guide portion 8d5.
- a space for disposing the discharge valve spring 8c is formed inside the valve body housing 8d.
- the valve body 8b is inserted.
- the valve body 8b moves rightward against the urging force of the discharge valve spring 8c, the right end portion of the discharge valve spring 8c comes into contact with the stepped portion 8d6 to prevent the valve body 8b from moving. That is, the stepped portion 8d6 functions as the stopper 805 described with reference to FIG.
- the valve body 8b is guided by the guide portion 8d5 and can reciprocate in the Z-axis direction.
- a slight gap is provided between the outer periphery of the valve body 8b and the guide portion 8d5 so that the valve body 8b can slide. Therefore, the valve body 8b reciprocates mainly in the Z-axis direction, but can move in the direction perpendicular to the Z-axis. Therefore, if the valve body 8b is offset with respect to the guide portion 8d5, fluttering may occur.
- the left end surface of the valve body 8b (surface facing the seat portion 8a) is a flat surface, and a recess 8b1 is formed at the center thereof.
- the periphery of the recess 8b1 is a ring-shaped plane, which becomes the valve seat 8b2.
- a circumferential stepped portion 1b with which the flange portion 8A1 of the valve seat member 8A abuts is formed on the inner peripheral surface of the pump housing 1.
- the valve seat member 8A is press-fitted into the pump housing 1 from the left direction in the figure, and is positioned by the flange portion 8A1 of the valve seat member 8A coming into contact with the circumferential stepped portion 1b.
- the inside of the valve seat member 8 ⁇ / b> A is hollow, and the fuel pressurized in the pressurizing chamber 11 flows into the discharge valve 8.
- the right end surface of the valve seat member 8A is a ring-shaped plane and functions as the seat portion 8a.
- the valve seat 8b2 and the seat portion 9a are opposed to each other, and when the two are in close contact, the discharge valve 8 is closed, and when both are separated, the discharge valve 8 is opened.
- the surface of the valve seat 8b2 of the valve body 8b is parallel to a plane orthogonal to the axial direction of the valve body 8b (the direction in which the valve body 8b reciprocates: the Z-axis direction), and the seat portion with which the valve seat 8b2 abuts.
- the surface of 8a is also parallel to the plane orthogonal to the axial direction of the valve body, and the valve of this embodiment is a flat valve.
- a tapered portion 801 is provided around the valve seat 8b2 of the valve body 8b. Therefore, the outer diameter of the valve body 8b, that is, the diameter Rb2 of the portion inserted into the guide portion 806 of the valve body housing 8d is configured to be larger than the outer diameter Rb1 of the valve seat 8b2. With such a configuration, a tubular gap is formed between the outer periphery of the valve body 8b and the inner periphery of the valve body housing 8d. This tubular gap will be described later with reference to FIG.
- a stepped portion 8A2 is formed on the outer periphery of the valve seat member 8A on the seat portion 8a side. Therefore, the outer diameter Ra1 of the outer periphery on the seat portion 8a side of the valve seat member 8A is smaller than the outer diameter Ra2 on the left side of the valve seat member 8A. Further, the convex portion on the seat portion 8a side of the valve seat member 8A is located on the inner peripheral side of the valve housing 8d. The outer diameter Ra1 of the outer periphery of the valve seat member 8A on the seat portion 8a side is configured to be smaller than the inner diameter 8d1 of the valve housing 8d. With such a configuration, a tubular gap is formed between the outer periphery of the valve seat member 8A and the inner periphery of the valve housing 8d. This tubular gap will be described later with reference to FIG.
- FIG. 4 is an enlarged cross-sectional view of the main part showing the configuration of the discharge valve used in the high-pressure fuel supply pump according to the first embodiment of the present invention.
- FIG. 4 the same reference numerals as those in FIGS. 1 to 3 denote the same parts.
- FIG. 5 is an explanatory diagram of the fuel flow in the discharge valve used in the high-pressure fuel supply pump according to the first embodiment of the present invention.
- a tubular gap 805B is formed between the outer periphery of the valve body 8b and the inner periphery of the valve body housing 8d. Further, a tubular gap 805C is formed between the outer periphery of the valve seat member 8A and the inner periphery of the valve housing 8d. Furthermore, in a state where the discharge valve is open, there is a gap between the seat portion 8a and the valve seat 8b2, and thus a tubular gap 805A corresponding to this gap is formed.
- tubular gaps 805A, 805B and 805C communicate with each other.
- the cross-sectional area of the conventional tubular gap corresponds to the cross-sectional area of the tubular gap 805A.
- the cross-sectional area of the tubular gap according to the present embodiment is the sum of the cross-sectional area of the tubular gap 805A, the cross-sectional area of the tubular gap 805B, and the cross-sectional area of the tubular gap 805C. That is, the tubular gaps 805A, 805B, and 805C constitute a liquid damper chamber.
- the cross sectional area is an area when a cross section of the discharge valve 8 is obtained on a plane including the axis of the valve body 8b (Z axis in the drawing) as shown in the figure.
- the flow A1 colliding with the valve body 8b from the axial direction when the discharge valve is opened is radially dispersed in the radial direction of the valve body.
- the flows A2 and A3 in the range where the discharge ports 803A and 803B are formed are directly flowed toward the discharge ports 803A and 803B in the radial direction of the valve body.
- the flow A4 toward the area where the discharge ports 803A and 803B are not formed collides with the inner wall of the valve housing 8d and then faces the discharge ports 803A and 803B in the circumferential direction of the valve body. It becomes flow A5, A6.
- the cross-sectional area of the tubular gap 805C is x1 ⁇ z3.
- the length of the tapered portion 801 of the valve body 8b is z2
- the width of the top portion of the taper is x1
- the cross-sectional area of the tubular gap 805B is (x1 ⁇ x2) / 2.
- the stroke of the valve body 8b is ST1, this is equal to the length z2 of the tubular gap 805A. If the length of the tubular gap 805A is z1 and the width is x, the sectional area of the tubular gap 805A is z1 ⁇ x1.
- the sectional area of the tubular gap 805C is made larger than the sectional area of the tubular gap 805B.
- the cross-sectional area (1.8 mm 2 ) of the tubular gap 805C is tubular.
- the cross-sectional area (0.68 mm 2 ) of the gap 805B is set twice or more.
- the cross-sectional area of the tubular gap 805A is 0.36 mm 2
- the cross-sectional area of the liquid damper chamber is 2.84 mm 2 .
- the cross-sectional area of the liquid damper chamber needs to be 0.3 mm 2 or more.
- the cross-sectional area of only the tubular gap 805A and the tubular gap 805B formed by the tapered portion 801 is 1.04 mm 2 , it is sufficient to reduce the pressure pulsation at the idle flow rate. It is not a sufficient cross-sectional area for the fuel flow rate under load.
- the tubular gap 805C the pressure pulsation can be sufficiently reduced even with respect to the fuel flow rate at the maximum load of the engine.
- a method for forming the tubular gap 805B in addition to providing the tapered portion 801 on the valve body 8b, a method of providing a stepped portion on the valve body 8b can be used as in the embodiment described later.
- the flow passing through the sheet portion 8a toward the discharge port 803 becomes a sudden expanded flow, and cavitation may occur.
- the loss head is large, and an unintended pressure pulsation may occur, which may promote fluttering.
- valve body 8b with the tapered portion 801 as described above, it is possible to reduce the change in direction of the discharge flow flowing from the seat portion 8a toward the discharge port 803 while forming the tubular gap 805B. . Thereby, a flow becomes smooth and generation
- the sectional area ⁇ of the fluid passage is such that ⁇ > 0.1 ⁇ ⁇ with respect to the opening area ⁇ when the discharge valve is fully opened.
- the cross-sectional area ⁇ of the fluid passage is a cross-sectional area (0.3 mm 2 ) of the liquid damper chamber that makes the pressure loss equal to or less than a predetermined value at an idle flow rate of a 4-cylinder engine with a displacement of 1500 cc.
- the cross-sectional area ⁇ of the fluid passage is larger than the opening area ⁇ when the discharge valve is fully open, with ⁇ > 0. 1 ⁇ ⁇ .
- FIG. 6 is an explanatory diagram of the measurement result of the discharge pressure of the high-pressure fuel supply pump according to the first embodiment of the present invention.
- FIG. 6A shows the change of the discharge port pressure P with respect to time t.
- a pressure P1 indicated by a thin solid line indicates a change in pressure at the discharge port in a high-pressure fuel supply pump having a conventional configuration.
- the conventional configuration is a case where the tubular passage 503B and the tubular passage 503C are not provided in the configuration shown in FIG.
- the pressure P2 indicated by a thick solid line indicates a change in pressure at the discharge port in the high-pressure fuel supply pump according to the present embodiment described with reference to FIGS.
- the configuration shown in FIG. 4 includes a tubular passage 503B and a tubular passage 503C in addition to the tubular passage 503A. As shown in FIG. Accordingly, the pressure fluctuation at the discharge port can be reduced.
- FIG. 6B shows the pulsation amplitude V of the outlet pressure obtained by Fourier transforming the change in pressure shown in FIG. 6A, and the horizontal axis is shown as frequency f.
- the pulsation amplitude V1 indicated by a thin solid line is of a conventional configuration
- the pulsation amplitude V2 indicated by a thick solid line is according to the present embodiment.
- the range from frequency f1 to frequency f2 is the human audible range. In this way, in particular, it is effective in reducing the pulsation amplitude in the audible range, and noise can be reduced.
- the discharge valve 8 includes a seat member 8A having the seat portion 8a described in FIG. 2, a valve body 8b, a discharge valve spring 8c, and a valve body housing 8d. These parts are assembled inside the pump housing 1.
- Assembling is performed from the left side of the pump housing 1 shown in FIG. As shown in FIG. 1, the electromagnetic suction valve mechanism 30 and the plunger 2 of the pressurizing chamber 11 are assembled inside the pump housing 1. Before these parts are assembled, the pump housing 1 is provided with a hole for incorporating the electromagnetic suction valve mechanism 30. Each component of the discharge valve 8 is inserted from this hole, and the discharge valve 8 is assembled in the internal space on the right side of the pump housing 1 shown in FIG. 2 via the internal space of the pressurizing chamber 11.
- valve body housing 8d is press-fitted into the inner space on the right side of the pump housing 1 shown in FIG. At this time, the valve body housing 8d is press-fitted into the pump housing 1 from the left direction in the drawing, and the flange 8d3 of the valve body housing 8d is positioned by contacting the circumferential stepped portion 1a.
- valve body 8b is inserted into the valve body housing 8d.
- the seat member 8A is press-fitted into the pump housing 1 from the left direction in the drawing, and the flange portion 8A1 of the valve seat member 8A is positioned by contacting the circumferential stepped portion 1b.
- each component of the discharge valve 8 is sequentially assembled from the left direction in FIG. 2, that is, from the direction of the pressurizing chamber 11, but may be incorporated from the right direction in FIG.
- a hole into which the seat member 8A can be inserted is formed in the right direction of the pump housing 1. From this hole, the seat member 8A is press-fitted and fixed, then the valve body 8b and the discharge valve spring 8c are sequentially inserted, and finally the valve body housing 8d is press-fitted and fixed.
- FIG. 7 is a sectional view showing a configuration of a discharge valve unit used as a discharge valve of the high-pressure fuel supply pump according to the first embodiment of the present invention.
- the movement direction of the valve is the Z axis
- the axes orthogonal to the Z axis are the X axis and the Y axis, respectively.
- FIG. 7A is a longitudinal sectional view in the ZY plane
- FIG. 7B is a longitudinal sectional view in the ZX plane.
- 7A and 7B show the opened state of the discharge valve.
- the same reference numerals as those in FIG. 1 denote the same parts.
- the stepped portion 8A3 of the valve seat portion 8a is press-fitted into the inner peripheral surface of the valve housing 8d, whereby the discharge valve unit 8 is integrated. Has been.
- the discharge valve unit 8U having the above configuration is integrally press-fitted into the pump housing 1 from the direction of the pressurizing chamber 11 in the left direction of FIG. can do. Further, the discharge valve unit 8U can be integrally press-fitted into the pump housing 1 from the right side of the pump unit 1 shown in FIG.
- the flow toward the range where the discharge port is not formed is transferred to the circumferential liquid damper chamber.
- the pressure distribution around the valve element can be eliminated, the differential pressure acting on the valve element can be reduced, and fluttering can be suppressed.
- a circumferential fluid passage (tubular passage 805C) having a cross-sectional area greater than or equal to a predetermined value is formed in advance, so The area change rate can be kept small. As a result, the differential pressure generated on both sides of the valve body can be reduced, and fluttering can be suppressed.
- the cross-sectional area of the fluid passage is increased without increasing the pressure receiving area where the pressure pulsation in the fluid passage acts on the valve body, Even if a sufficient fluid guiding function in the circumferential direction is achieved and pressure pulsation occurs in the fluid passage, the influence on the valve body behavior can be minimized and fluttering can be suppressed.
- the influence of noise caused by the flow in the circumferential direction of the valve body can be reduced.
- valve body and the valve body housing are used, but fluttering of the valve body can also be performed by forming a fluid passage in the circumferential direction in a similar manner for valves of other shapes. Can be suppressed.
- FIG. 8 is a longitudinal sectional view showing a configuration of a discharge valve used in the high-pressure fuel supply pump according to the second embodiment of the present invention.
- FIG. 8 shows the opened state of the discharge valve.
- the same reference numerals as those in FIGS. 1 to 4 denote the same parts.
- the discharge valve 8 includes a seat portion 8a, a valve body 8b, a discharge valve spring 8c, and a valve body housing 8d.
- the valve body 8b and the valve body housing 8d are cylindrical, and the discharge ports 803A and 803B are formed at two locations facing the side of the seat portion 8a. Note that three or more discharge ports may be provided in the circumferential direction.
- the outer diameter of the valve body 8b that is, the diameter of the portion inserted into the guide portion 8d5 of the valve body housing 8d is configured to be larger than the outer diameter of the seat portion 8a.
- a stepped portion 802 is provided around 8b2.
- a tubular gap 805B is formed between the valve body 8b and the valve body housing 8d.
- a tubular gap 805C is formed between the outer peripheral portion of the seat portion 8a and the inner diameter portion of the valve body housing 8d.
- a sufficient cross-sectional area can be secured without increasing the pressure receiving area where the pressure pulsation in the tubular gap acts on the valve body 8b, and fluttering of the valve body 8b can be achieved. It can suppress and can reduce noise.
- the cross-sectional area of the tubular gap 805C is larger than the cross-sectional area of the tubular gap 805B, and the pressure receiving area where pressure pulsation acts can be reduced.
- valve body and the valve body housing are used, but fluttering of the valve body can also be performed by forming a fluid passage in the circumferential direction in a similar manner for valves of other shapes. Can be suppressed.
- FIG. 9 is a longitudinal sectional view showing the configuration of the discharge valve used in the high-pressure fuel supply pump according to the third embodiment of the present invention.
- FIG. 9 shows the opened state of the discharge valve.
- the same reference numerals as those in FIGS. 1 to 4 denote the same parts.
- a plate-like valve body 8b in which the guide portion 806 in the embodiment shown in FIGS. 2 and 8 is not provided is used.
- the structure and processing are easy and advantageous in cost reduction, compared to the case where the valve body with a guide portion as in the embodiment shown in FIGS. 2 and 8 is used. .
- suppression of fluttering is essential not only from noise reduction but also from the viewpoint of operational reliability.
- the outer diameter of the valve body 8b is configured to be larger than the outer diameter of the seat portion 8a, and a tapered portion 807 is provided.
- the tubular gap 805B is formed, a smooth flow can be generated in the circumferential direction, and the uneven pressure distribution can be reduced.
- the taper 807 the change in the direction of the main flow in the radial direction toward the discharge ports 803A and 803B can be reduced and smoothed.
- the present invention is not limited to high-pressure fuel supply pumps for internal combustion engines, and can be widely used for various high-pressure pumps.
- FIG. 1 is an overall configuration diagram of a high-pressure fuel supply system using a high-pressure fuel supply pump according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure of the discharge valve used for the high pressure fuel supply pump by the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the discharge valve used for the high pressure fuel supply pump by the 1st Embodiment of this invention. It is a principal part expanded sectional view which shows the structure of the discharge valve used for the high pressure fuel supply pump by the 1st Embodiment of this invention. It is explanatory drawing of the flow of the fuel in the discharge valve used for the high pressure fuel supply pump by the 1st Embodiment of this invention.
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Abstract
Description
ことを特徴とする高圧燃料供給ポンプ。
図6Aに示すように、本実施形態によれば、吐出口の圧力変動を小さくできる。
1a,1b…円周段付部
2…プランジャ
8…吐出弁
8A…シート部材
8A1…フランジ部
8A2…段付部
8a…シート部
8b…弁体8b
8b1…凹部
8b2…弁座
8c…吐出弁ばね
8d…弁体ハウジング
8d1…ガイド周面
8d2…カット平面部
8d3…フランジ部
8d4…均圧孔
8d5…ガイド部
8d6…段付部
9…圧力脈動低減機構
10c…吸入通路
11…加圧室
13…吐出口
20…燃料タンク
23…コモンレール
24…インジェクタ
26…圧力センサ
27…ECU
30…電磁吸入弁機構
801,807…テーパ部
802…段付部
803A,803B…吐出ポート
805…液体ダンパ室
805A,805B,805C…管状通路
Claims (8)
- プランジャの往復動作によって容積が変化する加圧室と、
該加圧室によって加圧された燃料を吐出する吐出口と、
該吐出口と前記加圧室の間に設けられ、逆止弁である吐出弁とを有し、
該吐出弁は、
前記吐出口に連通する複数の吐出ポートが形成された弁体ハウジングと、
該弁体ハウジングの内部に収納されるとともに、吐出弁ばねにより弁を閉じる方向に付勢された弁体と、
前記弁体ハウジングの内部に収納されるとともに、前記弁体と当接して弁を閉じるシート部を有するシート部材とからなる高圧燃料供給ポンプであって、
前記吐出弁は、
前記弁体に形成された弁座の面及び前記シート部の面が、前記弁体の軸方向に直交する平面と平行であるフラット弁であり、
開弁時に、前記加圧室から前記シート部材の中空部を経て、前記弁体に軸方向から衝突した燃料の流れは、前記弁体の半径方向に放射状に分散し、前記吐出ポートに直接向かう流れと、弁ハウジングの内壁に衝突した後、吐出ポートに向かい弁体の周方向の流れとなり、
前記シート部材の外周及び前記弁体の外周と前記弁ハウジングの内周との間に形成され、前記周方向の流れに対する液体ダンパ室を備える
ことを特徴とする高圧燃料供給ポンプ。 - 請求項1記載の高圧燃料供給ポンプにおいて、
前記液体ダンパ室は、前記弁体の外周と前記弁ハウジングの内周との間に形成された第1の管状通路と、
前記シート部材の外周と前記弁ハウジングの内周との間に形成された第2の管状通路とを備えることを特徴とする高圧燃料供給ポンプ。 - 請求項2記載の高圧燃料供給ポンプにおいて、
前記第1及び第2の管状通路は、
前記弁体の軸を含む平面における前記第2の管状通路の断面積が、前記第1の管状通路の断面積よりも大きいことを特徴とする高圧燃料供給ポンプ。 - 請求項3記載の高圧燃料供給ポンプにおいて、
前記弁体の外径は、前記弁座の外径よりも大きいことを特徴とする高圧燃料供給ポンプ。 - 請求項4記載の高圧燃料供給ポンプにおいて、
前記第1の管状通路は、前記弁体の前記弁座の外周に設けられたテーパーと前記弁ハウジングの内周との間に形成されることを特徴とする高圧燃料供給ポンプ。 - 請求項2記載の高圧燃料供給ポンプにおいて、
前記流体通路の断面積αが前記吐出弁の全開時における開口面積βに対しα>0.1×βとなることを特徴とする高圧燃料供給ポンプ。 - 請求項1記載の高圧燃料供給ポンプにおいて、
前記液体ダンパ室は、前記弁体の軸を含む平面における断面積が、0.3mm2よりも大きいことを特徴とする高圧燃料供給ポンプ。 - 加圧室によって加圧された燃料を逆止弁である吐出弁を経て吐出口から吐出する高圧燃料供給ポンプに用いられ、
前記吐出弁の一部を構成する弁体ハウジングの内部に圧入される吐出弁ユニットであって、
前記吐出弁ユニットは、
吐出弁ばねにより弁を閉じる方向に付勢された弁体と、
該弁体と当接して弁を閉じるシート部を有するシート部材とからなり、
前記吐出弁は、前記弁体に形成された弁座の面及び前記シート部の面が、前記弁体の軸方向に直交する平面と平行であるフラット弁であり、
開弁時に、前記加圧室から前記シート部材の中空部を経て、前記弁体に軸方向から衝突した燃料の流れは、前記弁体の半径方向に放射状に分散し、前記吐出ポートに直接向かう流れと、弁ハウジングの内壁に衝突した後、吐出ポートに向かい弁体の周方向の流れとなり、
前記シート部材の外周及び前記弁体の外周と前記弁ハウジングの内周との間に形成され、前記周方向の流れに対する液体ダンパ室を備える
ことを特徴とする吐出弁ユニット。
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JP2011500416A JP5180365B2 (ja) | 2009-02-20 | 2009-02-20 | 高圧燃料供給ポンプ及びそれに用いる吐出弁ユニット |
CN200980156950.0A CN102325987B (zh) | 2009-02-20 | 2009-02-20 | 高压燃料供给泵及用于该泵的排出阀单元 |
EP20090807523 EP2302195B1 (en) | 2009-02-20 | 2009-02-20 | High-pressure fuel feed pump, and discharge valve unit used therein |
PCT/JP2009/053077 WO2010095247A1 (ja) | 2009-02-20 | 2009-02-20 | 高圧燃料供給ポンプ及びそれに用いる吐出弁ユニット |
US12/674,145 US8740579B2 (en) | 2009-02-20 | 2009-02-20 | High-pressure fuel supply pump and discharge valve unit used therein |
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Also Published As
Publication number | Publication date |
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EP2302195A4 (en) | 2011-10-12 |
EP2302195A1 (en) | 2011-03-30 |
JPWO2010095247A1 (ja) | 2012-08-16 |
US8740579B2 (en) | 2014-06-03 |
JP5180365B2 (ja) | 2013-04-10 |
US20110123376A1 (en) | 2011-05-26 |
CN102325987A (zh) | 2012-01-18 |
CN102325987B (zh) | 2015-04-01 |
EP2302195B1 (en) | 2014-04-09 |
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