WO2020195222A1 - Fuel pump - Google Patents
Fuel pump Download PDFInfo
- Publication number
- WO2020195222A1 WO2020195222A1 PCT/JP2020/004726 JP2020004726W WO2020195222A1 WO 2020195222 A1 WO2020195222 A1 WO 2020195222A1 JP 2020004726 W JP2020004726 W JP 2020004726W WO 2020195222 A1 WO2020195222 A1 WO 2020195222A1
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- WO
- WIPO (PCT)
- Prior art keywords
- support member
- press
- cover
- fuel pump
- fitting
- Prior art date
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Classifications
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
Definitions
- the present invention relates to a fuel pump particularly suitable for use as a vehicle component, and relates to a fuel pump that supplies fuel to an engine at high pressure.
- a high-pressure pump described in Japanese Patent Application Laid-Open No. 2012-154304 (Patent Document 1) is known.
- the outer wall of the damper cylinder portion provided on the damper member and the inner wall of the cover cylinder portion provided on the cover member are welded over the entire circumference, so that between the damper member and the cover member. It forms a sealed damper chamber (paragraph 0025).
- This high-pressure pump further includes a cylindrical tubular member, and the outer wall of the tubular portion provided on the tubular member is in contact with the welded portion of the inner wall of the damper tubular portion with the cover tubular portion (paragraph 0045).
- the outer wall of the extended tubular portion provided on the tubular member abuts on the side wall of the concave portion provided on the housing (paragraph 0046), and the back side of the abutting portion between the cover member and the housing is the tubular portion.
- the member covers it (Fig. 4).
- the damper cover When welding the damper cover and the body, the position of the welded portion shifts between the damper cover and the body in the abutting direction due to expansion during melting and contraction during solidification. Therefore, in order to prevent the displacement between the damper cover and the body, a means for fixing the position between the damper cover and the body is required at the time of welding the damper cover and the body.
- the damper cover will be described as a cover portion.
- An object of the present invention is to provide a fuel pump having a structure capable of fixing the positions of a cover portion and a body.
- the fuel pump of the present invention With the body A cover portion that covers the body and Support members that support the accommodation part and A first press-fitting portion formed between the support member and the cover portion and fixing the support member to the cover portion, A second press-fitting portion formed between the support member and the body, formed on the same surface as the surface on which the first press-fitting portion of the support member is formed, and fixing the support member to the body. Be prepared.
- FIG. 3 is a cross-sectional view showing a cross section perpendicular to the axial direction of the plunger 2 as viewed from above the high-pressure fuel supply pump of FIG. It is sectional drawing which shows the cross section around the damper cover of FIG. It is sectional drawing which shows the cross section of the damper cover subassembly before body assembly.
- FIG. 1 is a conceptual diagram showing a configuration of an engine system to which a high-pressure fuel supply pump according to an embodiment of the present invention is applied.
- the vertical direction may be specified in the following description, this vertical direction is based on the vertical direction of FIG. 1, and does not necessarily match the vertical direction in the mounted state of the high-pressure fuel supply pump 100.
- the part surrounded by the broken line shows the main body of the high-pressure fuel supply pump (hereinafter referred to as a fuel pump) 100, and the mechanism and parts shown in the broken line are integrated with the body 1 (may be called a pump body). It is built into.
- a fuel pump high-pressure fuel supply pump
- the fuel in the fuel tank 103 is pumped from the fuel tank 103 by the feed pump 102 based on a signal from the engine control unit 101 (hereinafter referred to as an ECU).
- This fuel is pressurized to an appropriate feed pressure and sent to the low pressure fuel suction port 10a of the fuel pump through the fuel pipe 104.
- the low pressure fuel suction port 10a is provided in the suction pipe 5 (see FIGS. 2 and 5).
- the fuel flowing in from the low-pressure fuel suction port 10a reaches the suction port 3k of the electromagnetic suction valve mechanism 3 which is a capacity variable mechanism via the damper (damper mechanism) 9 which is a pressure pulsation reduction mechanism and the suction passage 10d.
- the fuel that has flowed into the electromagnetic suction valve mechanism 3 passes through the suction valve 3b, flows through the suction passage 1a formed in the body 1, and then flows into the pressurizing chamber 11.
- the cam mechanism 91 of the engine gives the plunger 2 reciprocating power. Due to the reciprocating motion of the plunger 2, fuel is sucked from the suction valve 3b in the descending stroke of the plunger 2, and the fuel is pressurized in the ascending stroke.
- the discharge valve mechanism 8 opens, and the pressure sensor 105 is mounted on the common rail 106 through the fuel discharge port 12a provided in the discharge joint 12 (see FIG. 2). High-pressure fuel is pumped to. Then, the injector 107 injects fuel into the engine based on the signal from the ECU 101.
- the fuel pump 100 of this embodiment is a fuel pump applied to a so-called direct injection engine system in which the injector 107 injects fuel directly into the cylinder cylinder of the engine.
- the fuel pump 100 discharges a desired flow rate of fuel by a signal from the ECU 101 to the electromagnetic suction valve mechanism 3.
- FIG. 2 is a cross-sectional view showing a cross section parallel to the axial direction of the plunger 2 of the high-pressure fuel supply pump according to the embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing a cross section perpendicular to the axial direction of the plunger 2 as viewed from above the high-pressure fuel supply pump of FIG.
- the fuel pump 100 uses the mounting flange 1e provided on the body 1 and is fixed to the fuel pump mounting portion 90 of the engine (internal combustion engine) with a plurality of bolts.
- a cylinder 6 that guides the reciprocating motion of the plunger 2 and forms a pressurizing chamber 11 together with the body 1 is attached to the body 1. Further, the body 1 is provided with an electromagnetic suction valve mechanism 3 for supplying fuel to the pressurizing chamber 11 and a discharge valve mechanism 8 for discharging fuel from the pressurizing chamber 11 to the discharge passage.
- the cylinder 6 is press-fitted with the body 1 on the outer peripheral side thereof.
- the pressurizing chamber 11 is composed of a body 1, an electromagnetic suction valve mechanism 3, a plunger 2, a cylinder 6, and a discharge valve mechanism 8.
- a tappet 92 is provided that converts the rotational motion of the cam 91 attached to the camshaft of the engine into a vertical motion and transmits it to the plunger 2.
- the plunger 2 is crimped to the tappet 92 by a spring 18 via a retainer 15. As a result, the plunger 2 can be reciprocated up and down with the rotational movement of the cam 91.
- the plunger seal 13 held at the lower end of the inner circumference of the seal holder 7 is installed in a slidable contact with the outer periphery of the plunger 2 at the lower portion in the drawing of the cylinder 6.
- the lubricating oil including the engine oil
- the relief valve mechanism 4 shown in FIGS. 2 and 3 is composed of a seat member 4e, a relief valve 4d, a relief valve holder 4c, a relief spring 4b, and a spring support member 4a.
- the urging force of the relief spring 4b acts via the relief valve holder 4c and is pressed against the seat member 4e to shut off the fuel.
- the relief valve mechanism 4 is configured so that when the differential pressure between the upstream side and the downstream side of the relief valve 4d exceeds the set pressure, the relief valve 4d opens against the urging force of the relief spring 4b. ..
- the relief valve mechanism 4 communicates with the pressurizing chamber 11 via the relief passage, but is not limited to this, and communicates with the low pressure passage (low pressure fuel chamber 10 or suction passage 10d, etc.). You may try to do it.
- the relief valve mechanism 4 is a valve configured to operate when a problem occurs in the common rail 106 or a member beyond the common rail 106 and the common rail 106 becomes abnormally high pressure.
- a damper cover 20 forming a low pressure fuel chamber 10 on the upper part of the fuel pump 100, and a suction pipe 5 is attached to the side surface portion thereof.
- the suction pipe 5 is connected to a low pressure pipe 104 that supplies fuel from the fuel tank 103 of the vehicle, and the fuel is supplied to the inside of the fuel pump 100 from the low pressure fuel suction port 10a of the suction pipe 5.
- the fuel that has passed through the suction pipe 5 reaches the suction port 3k of the electromagnetic suction valve mechanism 3 via the damper 9 which is a pressure pulsation reduction mechanism and the low pressure fuel flow path 10d.
- the volume of the pressurizing chamber 11 increases and the fuel pressure in the pressurizing chamber 11 decreases.
- the suction valve 3b is separated from the suction valve seat portion 3a and is opened. The fuel passes through the opening of the suction valve 3b and flows into the pressurizing chamber 11.
- the plunger 2 shifts to the ascending movement and shifts to the ascending stroke.
- the electromagnetic coil 3g remains in a non-energized state, and no magnetic urging force acts between the magnetic core 3e and the anchor 3h.
- the rod urging spring 3m is set to have a urging force necessary and sufficient to keep the suction valve 3b open in a non-energized state.
- the volume of the pressurizing chamber 11 decreases with the compression movement of the plunger 2. In this state, the fuel once sucked into the pressurizing chamber 11 passes through the opening of the suction valve 3b in the opened state again and is taken through the suction passage. Since it is returned to 10d, the pressure in the pressurizing chamber does not rise. This process is called a return process.
- the suction valve 3b is closed by the urging force of the suction valve urging spring 3l and the fluid force caused by the fuel flowing into the suction passage 10d.
- the fuel pressure in the pressurizing chamber 11 rises with the ascending motion of the plunger 2, and when the pressure exceeds the pressure of the fuel discharge port 12a, the high pressure fuel is discharged through the discharge valve mechanism 8 and the high pressure fuel is discharged to the common rail. It is supplied to 106. This process is called a discharge process.
- the ascending stroke from the lower start point to the upper start point of the plunger 2 consists of a return stroke and a discharge stroke. Then, by controlling the energization timing of the coil 3g of the electromagnetic suction valve mechanism 3, the amount of high-pressure fuel discharged can be controlled. If the timing of energizing the electromagnetic coil 3 g is advanced, the ratio of the return stroke during the ascending stroke is small and the ratio of the discharge stroke is large. That is, less fuel is returned to the suction passage 10d, and more fuel is discharged at high pressure. On the other hand, if the timing of energization is delayed, the ratio of the return stroke is large and the ratio of the discharge stroke is small during the ascending stroke. That is, more fuel is returned to the suction passage 10d, and less fuel is discharged at high pressure. The timing of energizing the electromagnetic coil 3g is controlled by a command from the ECU 101.
- the discharge valve mechanism 8 includes a discharge valve seat 8a, a discharge valve 8b that contacts and separates from the discharge valve seat 8a, a discharge valve spring 8c that urges the discharge valve 8b toward the discharge valve seat 8a, and a stroke (moving distance) of the discharge valve 8b. ) Is determined by the discharge valve stopper 8d, and the plug 8e that blocks the leakage of fuel to the outside.
- a discharge valve chamber 8g is formed on the secondary side of the discharge valve 8b, and the discharge valve chamber 8g communicates with the fuel discharge port 12a through a horizontal hole 14 formed in the body 1 in the horizontal direction.
- the discharge valve 8b When there is no fuel differential pressure between the pressurizing chamber 11 and the discharge valve chamber 8g, the discharge valve 8b is crimped to the discharge valve seat 8a by the urging force of the discharge valve spring 8c and is in a closed state. Only when the fuel pressure in the pressurizing chamber 11 becomes higher than the fuel pressure in the discharge valve chamber 8g, the discharge valve 8b opens against the urging force of the discharge valve spring 8c. When the discharge valve 8b is opened, the high-pressure fuel in the pressurizing chamber 11 is discharged to the common rail 106 (see FIG. 1) through the discharge valve chamber 8g and the fuel discharge port 12a. With the above configuration, the discharge valve mechanism 8 functions as a check valve that limits the fuel flow direction.
- a damper 9 is installed to reduce the pressure pulsation generated in the fuel pump 100 from spreading to the fuel pipe 104.
- the fuel that has once flowed into the pressurizing chamber 11 is returned to the suction passage 10d through the suction valve body 3b in the opened valve state again for capacity control, the fuel returned to the suction passage 10d returns to the low pressure fuel chamber 10.
- Pressure pulsation occurs.
- the damper 9 provided in the low-pressure fuel chamber 10 is formed of a metal diaphragm damper in which two corrugated disk-shaped metal plates are laminated on the outer periphery thereof and an inert gas such as argon is injected therein. Pressure pulsation is absorbed and reduced by the expansion and contraction of this metal damper.
- the plunger 2 has a large diameter portion 2a and a small diameter portion 2b, and the volume of the sub chamber 7a increases or decreases due to the reciprocating motion of the plunger.
- the sub chamber 7a communicates with the low pressure fuel chamber 10 by a communication passage 10e (FIG. 3).
- FIG. 4 is a cross-sectional view showing a cross section around the damper cover of FIG.
- the body 1 has an annular convex portion 1b at the upper end portion, and a concave portion 1c is formed inside the convex portion 1b in the radial direction, and the concave portion 1c constitutes the lower end portion of the low pressure fuel chamber 10.
- the damper 9 is sandwiched between the upper support member 21 and the lower support member 22 at the top and bottom, and is fixed to the inside of the damper cover 20.
- the damper cover 20 has a top surface portion 20T and a side surface portion 20S extending downward from the outer peripheral edge portion of the top surface portion 20T.
- the top surface portion 20T is composed of a stepped surface (upper step portion 20T1 and lower step portion 20T2) having a step in the vertical direction (axial direction of the plunger 2).
- the upper support member 21 is pressed downward by the pressing portion 20b of the damper cover 20.
- the pressing portion 20b is composed of a surface facing the body 1 side (a surface facing downward) in the lower portion 20T2 of the damper cover 20. Therefore, the portion of the damper cover 20 that comes into contact with the upper support member 21 is limited to a part of the top surface portion 20T, and it becomes easy to secure a fuel passage around the upper support member 21. Further, the position of the upper support member 21 in the radial direction (horizontal direction) in the low pressure fuel chamber 10 is determined by the outermost peripheral edge 21a coming into contact with the inner peripheral surface of the side surface portion 20S of the damper cover 20.
- the lower support member 22 has a side surface portion 22S extending along the inner peripheral surface of the side surface portion 20S of the damper cover 20 and the inner peripheral surface of the annular convex portion 1b of the body 1, and a side surface portion 22S radially inside from the upper end portion of the side surface portion 22S. It has an annular portion 22C formed by being bent into a.
- the outer peripheral surface of the side surface portion 22S of the lower support member 22 is press-fitted and fixed to the inner peripheral surface of the side surface portion 20S of the damper cover 20, and is also press-fitted and fixed to the inner peripheral surface of the convex portion 1b of the body 1. ..
- the upper support member 21 and the lower support member 22 are the second support member 21 and the first support member 22, and since they sandwich the damper 9 with each other, they are also the second sandwich member 21 and the first sandwich member 22. Since the damper 9 is supported on the lower support member 22 and is sandwiched between the lower support member 22 and the upper support member 21 by receiving the pressing force from the upper support member 21, the lower support member 22 is a support member.
- the upper support member 21 is also called a pressing member.
- the press-fitting position of the lower support member 22 with the damper cover 20 is 20a, and the press-fitting position with the convex portion 1b is 1a.
- the press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are formed on the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface and the convex portion 1b of the side surface portion 20S of the damper cover 20. Since it is constructed between the inner peripheral surface and the inner peripheral surface, it is configured on the same cylindrical surface.
- the press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are in the press-fitting direction (up and down) of the lower support member (support member) 22, the body 1 and the damper cover (cover portion) 20. In the direction), they are placed in different positions. It is desirable that at least one of the upper support member 21 and the lower support member 22 is elastically deformed to apply an urging force between the damper cover 20, the upper support member 21 and the damper 9 to hold the damper cover 20 and the lower support member 22.
- the press-fitting portion (first press-fitting portion) 20a is formed between the outer peripheral surface of the lower support member (support member) 22 and the inner peripheral surface of the damper cover (cover portion) 20.
- the press-fitting portion (second press-fitting portion) 1a is formed between the outer peripheral surface of the lower support member 22 and the inner peripheral surface of the body 1. More specifically, the body 1 has an annular convex portion 1b at an end (portion) covered by the damper cover 20.
- the damper cover 20 has a top surface portion 20T and a side surface portion 20S extending downward (body 1 side) from the outer peripheral edge portion of the top surface portion 20T.
- the lower support member 22 has a side surface portion 22S extending along the inner peripheral surface of the side surface portion 20S of the damper cover 20 and the inner peripheral surface of the convex portion 1b of the body 1, and a top surface portion 20T on the side surface portion 22S of the lower support member 22. It has an annular portion 20C formed by being bent inward in the radial direction from the end portion on the side of.
- the press-fitting portion 20a is formed between the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface of the side surface portion 20S of the damper cover 20.
- the press-fitting portion 1a is formed between the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface of the annular convex portion 1b.
- the press-fitting portion (second press-fitting portion) 1a which is formed on the same surface as the surface on which the press-fitting portion 20a of the 22 is formed (the outer peripheral surface portion of the side surface portion 22S) and fixes the lower support member 22 to the body 1, is provided.
- a damper (damper mechanism) 9 is arranged on the inner peripheral side of the damper cover (cover portion) 20, and the lower support member (support member) 22 covers the damper 9 with the press-fitting portion (first press-fitting portion) 20a. It is held in contact with the lower surface of 20 (the back surface of the top surface portion 20T).
- the lower end of the side surface 20S of the damper cover (cover portion) 20 (lower end of the side surface 20S) and the upper end of the convex portion 1b of the body 1 (upper end of the convex portion 1b) are arranged so as to be in contact with each other.
- the abutting portion (contact surface) BU is formed and welded at the position of the abutting portion BU.
- the press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are dampers in the press-fitting direction (vertical direction) of the lower support member (support member) 22, the body 1 and the damper cover 20.
- the press-fitting portion 20a is the range shown in l20
- the press-fitting portion 1a is the range shown in l1
- the image of the molten part is shown by a broken line on the welded part W. Since the size of the welded portion varies depending on the welding conditions, the image in this figure is shown as an example.
- the welded portion W for fixing the damper cover (cover portion) 20 and the body 1 is provided on the radial outer side of the lower support member (support member) 22. That is, the welded portion W is irradiated with a laser from the radial outside of the damper cover 20 and the body 1 to perform welding.
- the welded portion W is provided on the contact surface between the lower end portion of the damper cover 20 (lower end portion of the side surface portion 20S) and the upper end portion of the body 1 (upper end portion of the convex portion 1b), and on the damper cover 20 side and the body 1 side. It is provided so as to straddle.
- the welded portion W in the abutting portion BU reaches the side surface portion 22S of the lower support member 22. It may be stopped within a range that does not exist and only the fuel is sealed. However, in this embodiment, the molten portion of the welded portion W reaches the side surface portion 22S of the lower support member 22 and has a depth at which a part (outer peripheral side) of the side surface portion 22S in the thickness direction is melted. That is, the welded portion W is formed to a depth that melts a part of the lower support member (support member) 22 in the thickness direction, and a non-melted portion remains in the other portion of the lower support member 22 in the thickness direction.
- the damper cover 20 is fixed to the body 1.
- the molten portion of the welded portion W has a depth that melts the entire side surface portion 22S in the thickness direction, the fixed state of the damper cover 20 with respect to the body 1 cannot be maintained. Therefore, the molten portion of the welded portion W has a depth at which a part of the side surface portion 22S in the thickness direction is melted, and a depth at which the entire side surface portion 22S in the thickness direction is not melted.
- the cylindrical surface of the side surface portion 22S of the lower support member 22 can be formed with a simple method and with high accuracy. Since it can be processed, it is easy to obtain the coaxiality of the press-fitting portion 20a and the press-fitting portion 1a.
- the press-fitting portion 20a and the press-fitting portion 1a are arranged close to each other in the press-fitting direction (vertical direction), and the welded portion W melts the proximity portion of the press-fitting portion 20a and the press-fitting portion 1a. Therefore, the press-fitting portion 20a, the welding portion W, and the press-fitting portion 1a are arranged adjacent to each other in this order in the press-fitting direction (vertical direction).
- a gap g is provided between the lower end surface of the lower holding member 22 and the body 1. That is, a state in which the lower end portion (end portion on the anti-top surface side) of the side surface portion 20S of the damper cover (cover portion) 20 is in contact with the upper end portion (end portion on the damper cover 20 side) of the annular convex portion 1b of the body 1.
- the lower end of the side surface portion 22S of the lower support member (support member) 22 is arranged so as to be in non-contact with the bottom surface 1d of the concave portion formed inside the annular convex portion 1b.
- This gap g prevents the lower holding member 22 from being pushed in contact with the bottom surface 1d of the concave portion 1c formed by the convex portion 1b of the body 1 when the damper cover 20 is assembled, and prevents the upper holding member 21 and the lower holding member 22 from being pushed in. It is possible to prevent excessive stress from being generated at 20. However, if the upper holding member 21 or the lower holding member 22 can be sufficiently elastically deformed, it is also feasible to design so as not to provide a gap between the lower end surface of the lower holding member 22 and the body 1.
- FIG. 5 is a cross-sectional view showing a cross section of the damper cover subassembly before assembling the body. The cross-sectional position of FIG. 5 is different from that of FIG.
- the lower holding member 22 is press-fitted and fixed to the damper cover 20 at a press-fitting portion (press-fitting position) 20a, and the upper support member 21, the damper 9 and the lower support member 22 are assembled as a subassembly on the damper cover 20.
- the damper cover sub-assembly that is independently unitized in this way and then assembling this damper cover sub-assembly to the body 1, the damper cover 20, the upper support member 21, the damper 9, and the lower support member are assembled.
- Assembling 1 to 22 bodies can be simplified.
- the suction pipe 5 can be attached to the damper cover 20.
- a suction filter 17 is provided in the suction flow path 5a to prevent foreign matter of a predetermined size or larger from flowing from the fuel tank 103 into the fuel pump 100.
- the fuel that has entered the damper cover 20 passes through the gap flow path (upper and lower communication holes) 20c of the upper support member 21 and the gap flow path (upper and lower communication holes) 20d of the lower support member 22 and flows to the suction passage 10d.
- the upper support member 21 and / or one of the lower support members 22 are formed of one press plate. Further, it is desirable that the upper support member 21 and the lower support member 22 are formed with upper and lower communication holes 20c and 20d by press working on a portion different from the portion that holds the damper 9, specifically, on the outer peripheral side. With this configuration, it is possible to secure a fuel passage from the suction pipe 5 to the body side with an inexpensive configuration.
- the suction pipe 5 is provided above the fuel pump 100, but it may be desirable that the suction pipe 5 is located at a different position depending on the engine layout. For example, if it is difficult to arrange the fuel pipe from the engine in the upper part of the fuel pump 100, the suction pipe 5 may be provided in the central portion of the body 1. In that case, it is not necessary to provide the suction pipe 5 on the damper cover 20.
- the damper cover 20 can be welded to the body 1 at low cost with a small number of parts.
- damper cover 20 is fixed to the body 1
- this embodiment can also be applied to the case where other covers are fixed to the body 1.
- a member including other covers without being limited to the damper cover 20 is referred to as a cover portion.
- the part housed in the body 1 and covered with the cover part is referred to as a housed part (a part corresponding to the damper 9 of this embodiment).
- the present invention is not limited to the above-described examples, and includes various modifications.
- the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the configurations.
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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
The purpose of the present invention is to provide a fuel pump provided with a structure that enables fixing of the positions of a damper cover and a body. Thus, the fuel pump according to the present invention is provided with: a body 1; a cover part 20 which covers the body 1; a support member 22 which supports a housed part (damper 9); a first press-fit part 20a which is formed between the support member 22 and the cover part 20 and which fixes the support member 22 to the cover part 20; and a second press-fit part 1a which is formed between the support member 22 and the body 1 and which fixes the support member 22 to the body 1, the second press-fit part 1a being formed in the same surface, of the support member 22, as the first press-fit part 20a is.
Description
本発明は、特に車両用部品として用いられるのに好適な燃料ポンプに係わり、エンジンに燃料を高圧で供給する燃料ポンプに関する。
The present invention relates to a fuel pump particularly suitable for use as a vehicle component, and relates to a fuel pump that supplies fuel to an engine at high pressure.
本発明の背景技術として、特開2012-154304号公報(特許文献1)に記載された高圧ポンプが知られている。この高圧ポンプは、ダンパ部材に設けられたダンパ筒部の外壁とカバー部材に設けられたカバー筒部の内壁とが全周に亘って溶接されることで、ダンパ部材とカバー部材との間に密閉されたダンパ室を形成している(段落0025)。
この高圧ポンプは、さらに円筒状の筒部材を備え、筒部材に設けられた筒部の外壁がダンパ筒部の内壁のうちカバー筒部との溶接箇所に当接している(段落0045)。さらに特許文献1の高圧ポンプでは、筒部材に設けられた延伸筒部の外壁がハウジングに設けられた凹部の側壁に当接し(段落0046)、カバー部材とハウジングとの突き当て部の裏側を筒部材が覆っている(図4)。このような構成により、特許文献1の高圧ポンプでは、筒部材の筒部が、ダンパ筒部のうちカバー筒部との溶接箇所の径方向内側への変形を抑制し、溶接個所の溶接状態が安定に保たれるようにしている(段落0048)。 As a background technique of the present invention, a high-pressure pump described in Japanese Patent Application Laid-Open No. 2012-154304 (Patent Document 1) is known. In this high-pressure pump, the outer wall of the damper cylinder portion provided on the damper member and the inner wall of the cover cylinder portion provided on the cover member are welded over the entire circumference, so that between the damper member and the cover member. It forms a sealed damper chamber (paragraph 0025).
This high-pressure pump further includes a cylindrical tubular member, and the outer wall of the tubular portion provided on the tubular member is in contact with the welded portion of the inner wall of the damper tubular portion with the cover tubular portion (paragraph 0045). Further, in the high-pressure pump ofPatent Document 1, the outer wall of the extended tubular portion provided on the tubular member abuts on the side wall of the concave portion provided on the housing (paragraph 0046), and the back side of the abutting portion between the cover member and the housing is the tubular portion. The member covers it (Fig. 4). With such a configuration, in the high-pressure pump of Patent Document 1, the tubular portion of the tubular member suppresses the radial inward deformation of the welded portion of the damper tubular portion with the cover tubular portion, and the welded state of the welded portion is maintained. It is kept stable (paragraph 0048).
この高圧ポンプは、さらに円筒状の筒部材を備え、筒部材に設けられた筒部の外壁がダンパ筒部の内壁のうちカバー筒部との溶接箇所に当接している(段落0045)。さらに特許文献1の高圧ポンプでは、筒部材に設けられた延伸筒部の外壁がハウジングに設けられた凹部の側壁に当接し(段落0046)、カバー部材とハウジングとの突き当て部の裏側を筒部材が覆っている(図4)。このような構成により、特許文献1の高圧ポンプでは、筒部材の筒部が、ダンパ筒部のうちカバー筒部との溶接箇所の径方向内側への変形を抑制し、溶接個所の溶接状態が安定に保たれるようにしている(段落0048)。 As a background technique of the present invention, a high-pressure pump described in Japanese Patent Application Laid-Open No. 2012-154304 (Patent Document 1) is known. In this high-pressure pump, the outer wall of the damper cylinder portion provided on the damper member and the inner wall of the cover cylinder portion provided on the cover member are welded over the entire circumference, so that between the damper member and the cover member. It forms a sealed damper chamber (paragraph 0025).
This high-pressure pump further includes a cylindrical tubular member, and the outer wall of the tubular portion provided on the tubular member is in contact with the welded portion of the inner wall of the damper tubular portion with the cover tubular portion (paragraph 0045). Further, in the high-pressure pump of
特許文献1には説明がないものの、高圧燃料供給ポンプ(燃料ポンプ)では、カバー部材(ダンパカバー)とハウジング(ボディ)との間に設けられた突き当て部で、ダンパカバーとボディとが溶接される。この場合、特許文献1の高圧燃料供給ポンプでは、ダンパカバーとボディとの溶接時に、ダンパカバーとボディとの溶接部の裏側を覆う筒部材が、ダンパカバー(カバー部材)及びボディ(ハウジング)に対して突き当て部の裏側で当接しているものの、ダンパカバー及びボディをダンパカバーとボディとの突き当て方向において筒部材で固定することについては、配慮されていない。
Although not described in Patent Document 1, in a high-pressure fuel supply pump (fuel pump), the damper cover and the body are welded at abutment portion provided between a cover member (damper cover) and a housing (body). Will be done. In this case, in the high-pressure fuel supply pump of Patent Document 1, when the damper cover and the body are welded, the tubular member that covers the back side of the welded portion between the damper cover and the body is replaced with the damper cover (cover member) and the body (housing). On the other hand, although the contact is made on the back side of the abutting portion, no consideration is given to fixing the damper cover and the body with a tubular member in the abutting direction between the damper cover and the body.
ダンパカバーとボディとの溶接時には、溶接部の溶融時の膨脹と凝固時の収縮とにより、ダンパカバーとボディとの間で突き当て方向における位置ずれが生じる。従って、このダンパカバーとボディとの位置ずれを防ぐためには、ダンパカバーとボディとの溶接時に、ダンパカバーとボディとの位置を固定する手段が必要になる。以下、ダンパカバーはカバー部として説明する。
When welding the damper cover and the body, the position of the welded portion shifts between the damper cover and the body in the abutting direction due to expansion during melting and contraction during solidification. Therefore, in order to prevent the displacement between the damper cover and the body, a means for fixing the position between the damper cover and the body is required at the time of welding the damper cover and the body. Hereinafter, the damper cover will be described as a cover portion.
本発明の目的は、カバー部とボディとの位置を固定することができる構造を備えた燃料ポンプを提供することにある。
An object of the present invention is to provide a fuel pump having a structure capable of fixing the positions of a cover portion and a body.
上記目的を達成するために、本発明の燃料ポンプは、
ボディと、
前記ボディを覆うカバー部と、
被収容部を支持する支持部材と、
前記支持部材と前記カバー部との間に形成され、前記支持部材を前記カバー部に固定する第1圧入部と、
前記支持部材と前記ボディとの間に形成され、前記支持部材の前記第1圧入部が形成される面と同一面に形成され、前記支持部材を前記ボディに固定する第2圧入部と、を備える。 In order to achieve the above object, the fuel pump of the present invention
With the body
A cover portion that covers the body and
Support members that support the accommodation part and
A first press-fitting portion formed between the support member and the cover portion and fixing the support member to the cover portion,
A second press-fitting portion formed between the support member and the body, formed on the same surface as the surface on which the first press-fitting portion of the support member is formed, and fixing the support member to the body. Be prepared.
ボディと、
前記ボディを覆うカバー部と、
被収容部を支持する支持部材と、
前記支持部材と前記カバー部との間に形成され、前記支持部材を前記カバー部に固定する第1圧入部と、
前記支持部材と前記ボディとの間に形成され、前記支持部材の前記第1圧入部が形成される面と同一面に形成され、前記支持部材を前記ボディに固定する第2圧入部と、を備える。 In order to achieve the above object, the fuel pump of the present invention
With the body
A cover portion that covers the body and
Support members that support the accommodation part and
A first press-fitting portion formed between the support member and the cover portion and fixing the support member to the cover portion,
A second press-fitting portion formed between the support member and the body, formed on the same surface as the surface on which the first press-fitting portion of the support member is formed, and fixing the support member to the body. Be prepared.
本発明によれば、カバー部とボディとの位置を固定することができる構造を備えた燃料ポンプを提供することができる。上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。
According to the present invention, it is possible to provide a fuel pump having a structure capable of fixing the positions of the cover portion and the body. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.
以下、本発明の実施形態について図面を参照して詳細に説明する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
まず、本発明の一実施例に係る高圧燃料供給ポンプ100について、図面を用いて詳細に説明する。
First, the high-pressure fuel supply pump 100 according to an embodiment of the present invention will be described in detail with reference to the drawings.
図1は、本発明の一実施例に係る高圧燃料供給ポンプが適用されたエンジンシステムの構成を示す概念図である。以下の説明で上下方向を指定して説明する場合があるが、この上下方向は図1の上下方向に基づいており、高圧燃料供給ポンプ100の実装状態における上下方向とは必ずしも一致しない。
FIG. 1 is a conceptual diagram showing a configuration of an engine system to which a high-pressure fuel supply pump according to an embodiment of the present invention is applied. Although the vertical direction may be specified in the following description, this vertical direction is based on the vertical direction of FIG. 1, and does not necessarily match the vertical direction in the mounted state of the high-pressure fuel supply pump 100.
破線で囲まれた部分は高圧燃料供給ポンプ(以下、燃料ポンプと呼ぶ)100の本体を示し、この破線の中に示されている機構及び部品はボディ1(ポンプボディと呼んでも良い)に一体に組み込まれている。
The part surrounded by the broken line shows the main body of the high-pressure fuel supply pump (hereinafter referred to as a fuel pump) 100, and the mechanism and parts shown in the broken line are integrated with the body 1 (may be called a pump body). It is built into.
燃料タンク103の燃料は、エンジンコントロールユニット101(以下ECUと称す)からの信号に基づきフィードポンプ102によって燃料タンク103から汲み上げられる。この燃料は適切なフィード圧力に加圧されて燃料配管104を通して燃料ポンプの低圧燃料吸入口10aに送られる。低圧燃料吸入口10aは吸入配管5(図2,5参照)に設けられる。
The fuel in the fuel tank 103 is pumped from the fuel tank 103 by the feed pump 102 based on a signal from the engine control unit 101 (hereinafter referred to as an ECU). This fuel is pressurized to an appropriate feed pressure and sent to the low pressure fuel suction port 10a of the fuel pump through the fuel pipe 104. The low pressure fuel suction port 10a is provided in the suction pipe 5 (see FIGS. 2 and 5).
低圧燃料吸入口10aから流入した燃料は圧力脈動低減機構であるダンパ(ダンパ機構)9、吸入通路10dを介して容量可変機構である電磁吸入弁機構3の吸入ポート3kに至る。
The fuel flowing in from the low-pressure fuel suction port 10a reaches the suction port 3k of the electromagnetic suction valve mechanism 3 which is a capacity variable mechanism via the damper (damper mechanism) 9 which is a pressure pulsation reduction mechanism and the suction passage 10d.
電磁吸入弁機構3に流入した燃料は、吸入弁3bを通過し、ボディ1に形成された吸入通路1aを流れた後に加圧室11に流入する。エンジンのカム機構91(図2参照)によりプランジャ2に往復運動する動力が与えられる。プランジャ2の往復運動により、プランジャ2の下降行程には吸入弁3bから燃料を吸入し、上昇行程には燃料が加圧される。
The fuel that has flowed into the electromagnetic suction valve mechanism 3 passes through the suction valve 3b, flows through the suction passage 1a formed in the body 1, and then flows into the pressurizing chamber 11. The cam mechanism 91 of the engine (see FIG. 2) gives the plunger 2 reciprocating power. Due to the reciprocating motion of the plunger 2, fuel is sucked from the suction valve 3b in the descending stroke of the plunger 2, and the fuel is pressurized in the ascending stroke.
加圧室11の圧力が設定値を超えると、吐出弁機構8が開弁し、吐出ジョイント12(図2参照)に設けられた燃料吐出口12aを通じて、圧力センサ105が装着されているコモンレール106へ高圧燃料が圧送される。そしてECU101からの信号に基づきインジェクタ107がエンジンへ燃料を噴射する。本実施例の燃料ポンプ100は、インジェクタ107がエンジンのシリンダ筒内に直接、燃料を噴射する、いわゆる直噴エンジンシステムに適用される燃料ポンプである。燃料ポンプ100は、ECU101から電磁吸入弁機構3への信号により、所望の流量の燃料を吐出する。
When the pressure in the pressurizing chamber 11 exceeds the set value, the discharge valve mechanism 8 opens, and the pressure sensor 105 is mounted on the common rail 106 through the fuel discharge port 12a provided in the discharge joint 12 (see FIG. 2). High-pressure fuel is pumped to. Then, the injector 107 injects fuel into the engine based on the signal from the ECU 101. The fuel pump 100 of this embodiment is a fuel pump applied to a so-called direct injection engine system in which the injector 107 injects fuel directly into the cylinder cylinder of the engine. The fuel pump 100 discharges a desired flow rate of fuel by a signal from the ECU 101 to the electromagnetic suction valve mechanism 3.
図2は、本発明の一実施例に係る高圧燃料供給ポンプのプランジャ2の軸方向に平行な断面を示す断面図である。図3は、図2の高圧燃料供給ポンプの上方から見たプランジャ2の軸方向に垂直な断面を示す断面図である。
FIG. 2 is a cross-sectional view showing a cross section parallel to the axial direction of the plunger 2 of the high-pressure fuel supply pump according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing a cross section perpendicular to the axial direction of the plunger 2 as viewed from above the high-pressure fuel supply pump of FIG.
燃料ポンプ100はボディ1に設けられた取付けフランジ1eを用い、エンジン(内燃機関)の燃料ポンプ取付け部90に複数のボルトで固定される。
The fuel pump 100 uses the mounting flange 1e provided on the body 1 and is fixed to the fuel pump mounting portion 90 of the engine (internal combustion engine) with a plurality of bolts.
図2に示すように、ボディ1にはプランジャ2の往復運動をガイドし、ボディ1と共に加圧室11を形成するシリンダ6が取り付けられている。またボディ1には、燃料を加圧室11に供給するための電磁吸入弁機構3と、加圧室11から吐出通路に燃料を吐出するための吐出弁機構8が設けられている。
As shown in FIG. 2, a cylinder 6 that guides the reciprocating motion of the plunger 2 and forms a pressurizing chamber 11 together with the body 1 is attached to the body 1. Further, the body 1 is provided with an electromagnetic suction valve mechanism 3 for supplying fuel to the pressurizing chamber 11 and a discharge valve mechanism 8 for discharging fuel from the pressurizing chamber 11 to the discharge passage.
シリンダ6はその外周側においてボディ1と圧入される。加圧室11は、ボディ1、電磁吸入弁機構3、プランジャ2、シリンダ6、及び吐出弁機構8にて構成される。
The cylinder 6 is press-fitted with the body 1 on the outer peripheral side thereof. The pressurizing chamber 11 is composed of a body 1, an electromagnetic suction valve mechanism 3, a plunger 2, a cylinder 6, and a discharge valve mechanism 8.
プランジャ2の下端には、エンジンのカムシャフトに取り付けられたカム91の回転運動を上下運動に変換し、プランジャ2に伝達するタペット92が設けられている。プランジャ2はリテーナ15を介してばね18にてタペット92に圧着されている。これによりカム91の回転運動に伴い、プランジャ2を上下に往復運動させることができる。
At the lower end of the plunger 2, a tappet 92 is provided that converts the rotational motion of the cam 91 attached to the camshaft of the engine into a vertical motion and transmits it to the plunger 2. The plunger 2 is crimped to the tappet 92 by a spring 18 via a retainer 15. As a result, the plunger 2 can be reciprocated up and down with the rotational movement of the cam 91.
また、シールホルダ7の内周下端部に保持されたプランジャシール13がシリンダ6の図中下方部においてプランジャ2の外周に摺動可能に接触する状態で設置されている。これにより、プランジャ2が摺動したとき、副室7aの燃料をシールしエンジン内部へ流入するのを防ぐ。同時にエンジン内の摺動部を潤滑する潤滑油(エンジンオイルも含む)がボディ1の内部に流入するのを防止する。
Further, the plunger seal 13 held at the lower end of the inner circumference of the seal holder 7 is installed in a slidable contact with the outer periphery of the plunger 2 at the lower portion in the drawing of the cylinder 6. As a result, when the plunger 2 slides, the fuel in the sub chamber 7a is sealed and prevented from flowing into the engine. At the same time, it prevents the lubricating oil (including the engine oil) that lubricates the sliding portion in the engine from flowing into the body 1.
図2、3に示すリリーフ弁機構4は、シート部材4e、リリーフ弁4d、リリーフ弁ホルダ4c、リリーフばね4b、及びばね支持部材4aで構成される。リリーフ弁4dは、リリーフばね4bの付勢力がリリーフ弁ホルダ4cを介して作用してシート部材4eに押圧されることで燃料を遮断する。リリーフ弁機構4は、リリーフ弁4dの上流側と下流側との差圧が設定圧力を超えた場合に、リリーフばね4bの付勢力に抗してリリーフ弁4dが開弁するように構成される。
The relief valve mechanism 4 shown in FIGS. 2 and 3 is composed of a seat member 4e, a relief valve 4d, a relief valve holder 4c, a relief spring 4b, and a spring support member 4a. In the relief valve 4d, the urging force of the relief spring 4b acts via the relief valve holder 4c and is pressed against the seat member 4e to shut off the fuel. The relief valve mechanism 4 is configured so that when the differential pressure between the upstream side and the downstream side of the relief valve 4d exceeds the set pressure, the relief valve 4d opens against the urging force of the relief spring 4b. ..
本実施例ではリリーフ弁機構4は、リリーフ通路を介して加圧室11に連通しているが、これに限定されるわけではなく、低圧通路(低圧燃料室10又は吸入通路10d等)に連通するようにしても良い。リリーフ弁機構4は、コモンレール106やその先の部材に何らかの問題が生じ、コモンレール106が異常に高圧になった場合に作動するよう構成された弁である。
In this embodiment, the relief valve mechanism 4 communicates with the pressurizing chamber 11 via the relief passage, but is not limited to this, and communicates with the low pressure passage (low pressure fuel chamber 10 or suction passage 10d, etc.). You may try to do it. The relief valve mechanism 4 is a valve configured to operate when a problem occurs in the common rail 106 or a member beyond the common rail 106 and the common rail 106 becomes abnormally high pressure.
燃料ポンプ100の上部には低圧燃料室10を形成するダンパカバー20があり、その側面部には吸入配管5が取り付けられている。吸入配管5は、車両の燃料タンク103からの燃料を供給する低圧配管104に接続されており、燃料は吸入配管5の低圧燃料吸入口10aから燃料ポンプ100の内部に供給される。吸入配管5を通過した燃料は、圧力脈動低減機構であるダンパ9及び低圧燃料流路10dを介して電磁吸入弁機構3の吸入ポート3kに至る。
There is a damper cover 20 forming a low pressure fuel chamber 10 on the upper part of the fuel pump 100, and a suction pipe 5 is attached to the side surface portion thereof. The suction pipe 5 is connected to a low pressure pipe 104 that supplies fuel from the fuel tank 103 of the vehicle, and the fuel is supplied to the inside of the fuel pump 100 from the low pressure fuel suction port 10a of the suction pipe 5. The fuel that has passed through the suction pipe 5 reaches the suction port 3k of the electromagnetic suction valve mechanism 3 via the damper 9 which is a pressure pulsation reduction mechanism and the low pressure fuel flow path 10d.
プランジャ2がカム91の方向(下方向)に移動して吸入行程にあるときは、加圧室11の容積は増加し、加圧室11内の燃料圧力が低下する。この行程で加圧室11内の燃料圧力が吸入ポート3kの圧力よりも低くなると、吸入弁3bは吸入弁シート部3aから離れ開口状態になる。燃料は吸入弁3bの開口部を通り、加圧室11に流入する。
When the plunger 2 moves in the direction of the cam 91 (downward) and is in the suction stroke, the volume of the pressurizing chamber 11 increases and the fuel pressure in the pressurizing chamber 11 decreases. When the fuel pressure in the pressurizing chamber 11 becomes lower than the pressure in the suction port 3k in this process, the suction valve 3b is separated from the suction valve seat portion 3a and is opened. The fuel passes through the opening of the suction valve 3b and flows into the pressurizing chamber 11.
プランジャ2が吸入行程を終了した後、プランジャ2が上昇運動に転じ上昇行程に移る。ここで電磁コイル3gは無通電状態を維持したままであり、磁気コア3eとアンカ3hとの間に磁気付勢力は作用しない。ロッド付勢ばね3mは、無通電状態において吸入弁3bを開弁維持するのに必要十分な付勢力を有するよう設定されている。加圧室11の容積は、プランジャ2の圧縮運動に伴い減少するが、この状態では、一度、加圧室11に吸入された燃料が、再び開弁状態の吸入弁3bの開口部を通して吸入通路10dへと戻されるので、加圧室の圧力が上昇することは無い。この行程を戻し行程と称する。
After the plunger 2 has completed the inhalation stroke, the plunger 2 shifts to the ascending movement and shifts to the ascending stroke. Here, the electromagnetic coil 3g remains in a non-energized state, and no magnetic urging force acts between the magnetic core 3e and the anchor 3h. The rod urging spring 3m is set to have a urging force necessary and sufficient to keep the suction valve 3b open in a non-energized state. The volume of the pressurizing chamber 11 decreases with the compression movement of the plunger 2. In this state, the fuel once sucked into the pressurizing chamber 11 passes through the opening of the suction valve 3b in the opened state again and is taken through the suction passage. Since it is returned to 10d, the pressure in the pressurizing chamber does not rise. This process is called a return process.
この状態で、エンジンコントロールユニット101(以下ECUと呼ぶ)からの制御電流が電磁吸入弁機構3に供給されると、電磁コイル3gには端子16を介して電流が流れる。電磁コイル3gに電流が流れると磁気コア3eとアンカ3hとの間に磁気吸引力が作用し、磁気吸引力がロッド付勢ばね3mの付勢力(とその他の合力)よりも強ければ、磁気コア3eとアンカ3hとが磁気吸引面で衝突する。このとき、アンカ3hはロッド鍔部3jを介して、ロッド3iを吸入弁3bから離れる方向に移動させる。
In this state, when the control current from the engine control unit 101 (hereinafter referred to as ECU) is supplied to the electromagnetic suction valve mechanism 3, the current flows through the terminal 16 through the electromagnetic coil 3g. When a current flows through the electromagnetic coil 3g, a magnetic attractive force acts between the magnetic core 3e and the anchor 3h, and if the magnetic attractive force is stronger than the urging force (and other resultant force) of the rod urging spring 3m, the magnetic core The 3e and the anchor 3h collide with each other on the magnetic attraction surface. At this time, the anchor 3h moves the rod 3i away from the suction valve 3b via the rod collar portion 3j.
その後、吸入弁付勢ばね3lによる付勢力と燃料が吸入通路10dに流れ込むことによる流体力により吸入弁3bが閉弁する。閉弁後、加圧室11の燃料圧力はプランジャ2の上昇運動と共に上昇し、燃料吐出口12aの圧力以上になると、吐出弁機構8を介して高圧燃料の吐出が行われ、高圧燃料がコモンレール106へと供給される。この行程を吐出行程と称する。
After that, the suction valve 3b is closed by the urging force of the suction valve urging spring 3l and the fluid force caused by the fuel flowing into the suction passage 10d. After the valve is closed, the fuel pressure in the pressurizing chamber 11 rises with the ascending motion of the plunger 2, and when the pressure exceeds the pressure of the fuel discharge port 12a, the high pressure fuel is discharged through the discharge valve mechanism 8 and the high pressure fuel is discharged to the common rail. It is supplied to 106. This process is called a discharge process.
プランジャ2の下始点から上始点までの間の上昇行程は、戻し行程と吐出行程からなる。そして、電磁吸入弁機構3のコイル3gへの通電タイミングを制御することで、吐出される高圧燃料の量を制御することができる。電磁コイル3gへ通電するタイミングを早くすれば、上昇行程中の、戻し行程の割合が小さく、吐出行程の割合が大きくなる。すなわち、吸入通路10dに戻される燃料が少なく、高圧吐出される燃料は多くなる。一方、通電するタイミングを遅くすれば上昇行程中の、戻し行程の割合が大きく吐出行程の割合が小さくなる。すなわち、吸入通路10dに戻される燃料が多く、高圧吐出される燃料は少なくなる。電磁コイル3gへの通電タイミングは、ECU101からの指令によって制御される。
The ascending stroke from the lower start point to the upper start point of the plunger 2 consists of a return stroke and a discharge stroke. Then, by controlling the energization timing of the coil 3g of the electromagnetic suction valve mechanism 3, the amount of high-pressure fuel discharged can be controlled. If the timing of energizing the electromagnetic coil 3 g is advanced, the ratio of the return stroke during the ascending stroke is small and the ratio of the discharge stroke is large. That is, less fuel is returned to the suction passage 10d, and more fuel is discharged at high pressure. On the other hand, if the timing of energization is delayed, the ratio of the return stroke is large and the ratio of the discharge stroke is small during the ascending stroke. That is, more fuel is returned to the suction passage 10d, and less fuel is discharged at high pressure. The timing of energizing the electromagnetic coil 3g is controlled by a command from the ECU 101.
本実施例では、電磁吸入弁機構3の一例としてノーマルオープン式ソレノイド弁の構成を説明したが、電磁式に開閉可能なソレノイド弁の構造であれば、低圧部への影響は同じであり、後述するダンパカバー構造を適用することができる。
In this embodiment, the configuration of a normally open solenoid valve has been described as an example of the solenoid suction valve mechanism 3, but if the solenoid valve structure can be opened and closed electromagnetically, the effect on the low pressure portion is the same, which will be described later. A damper cover structure can be applied.
吐出弁機構8は、吐出弁シート8a、吐出弁シート8aと接離する吐出弁8b、吐出弁8bを吐出弁シート8aに向かって付勢する吐出弁ばね8c、吐出弁8bのストローク(移動距離)を決める吐出弁ストッパ8d、及び燃料の外部への漏洩を遮断するプラグ8eから構成されている。吐出弁8bの二次側には吐出弁室8gが形成され、この吐出弁室8gがボディ1に水平方向に形成される横孔14を介して燃料吐出口12aと連通する。
The discharge valve mechanism 8 includes a discharge valve seat 8a, a discharge valve 8b that contacts and separates from the discharge valve seat 8a, a discharge valve spring 8c that urges the discharge valve 8b toward the discharge valve seat 8a, and a stroke (moving distance) of the discharge valve 8b. ) Is determined by the discharge valve stopper 8d, and the plug 8e that blocks the leakage of fuel to the outside. A discharge valve chamber 8g is formed on the secondary side of the discharge valve 8b, and the discharge valve chamber 8g communicates with the fuel discharge port 12a through a horizontal hole 14 formed in the body 1 in the horizontal direction.
加圧室11と吐出弁室8gの間に燃料差圧が無い状態では、吐出弁8bは吐出弁ばね8cの付勢力により吐出弁シート8aに圧着され閉弁状態となっている。加圧室11の燃料圧力が吐出弁室8gの燃料圧力よりも大きくなった時に初めて、吐出弁8bは吐出弁ばね8cの付勢力に逆らって開弁する。吐出弁8bが開弁すると、加圧室11内の高圧の燃料は、吐出弁室8g、燃料吐出口12aを経てコモンレール106(図1参照)へ吐出される。以上のような構成により、吐出弁機構8は、燃料の流通方向を制限する逆止弁として機能する。
When there is no fuel differential pressure between the pressurizing chamber 11 and the discharge valve chamber 8g, the discharge valve 8b is crimped to the discharge valve seat 8a by the urging force of the discharge valve spring 8c and is in a closed state. Only when the fuel pressure in the pressurizing chamber 11 becomes higher than the fuel pressure in the discharge valve chamber 8g, the discharge valve 8b opens against the urging force of the discharge valve spring 8c. When the discharge valve 8b is opened, the high-pressure fuel in the pressurizing chamber 11 is discharged to the common rail 106 (see FIG. 1) through the discharge valve chamber 8g and the fuel discharge port 12a. With the above configuration, the discharge valve mechanism 8 functions as a check valve that limits the fuel flow direction.
低圧燃料室10には、燃料ポンプ100内で発生した圧力脈動が燃料配管104へ波及するのを低減させるダンパ9が設置されている。一度、加圧室11に流入した燃料が、容量制御のために、再び開弁状態の吸入弁体3bを通して吸入通路10dへと戻される場合、吸入通路10dへ戻される燃料により低圧燃料室10には圧力脈動が発生する。しかし、低圧燃料室10に設けたダンパ9は、波板状の円盤型金属板2枚をその外周で張り合わせ、内部にアルゴンのような不活性ガスを注入した金属ダイアフラムダンパで形成されており、圧力脈動はこの金属ダンパが膨張・収縮することで吸収低減される。
In the low pressure fuel chamber 10, a damper 9 is installed to reduce the pressure pulsation generated in the fuel pump 100 from spreading to the fuel pipe 104. When the fuel that has once flowed into the pressurizing chamber 11 is returned to the suction passage 10d through the suction valve body 3b in the opened valve state again for capacity control, the fuel returned to the suction passage 10d returns to the low pressure fuel chamber 10. Pressure pulsation occurs. However, the damper 9 provided in the low-pressure fuel chamber 10 is formed of a metal diaphragm damper in which two corrugated disk-shaped metal plates are laminated on the outer periphery thereof and an inert gas such as argon is injected therein. Pressure pulsation is absorbed and reduced by the expansion and contraction of this metal damper.
プランジャ2は、大径部2aと小径部2bを有し、プランジャの往復運動によって副室7aの体積は増減する。副室7aは連通路10e(図3)により低圧燃料室10と連通している。プランジャ2の下降時は、副室7aから低圧燃料室10へ、上昇時は、低圧燃料室10から副室7aへと燃料の流れが発生する。
The plunger 2 has a large diameter portion 2a and a small diameter portion 2b, and the volume of the sub chamber 7a increases or decreases due to the reciprocating motion of the plunger. The sub chamber 7a communicates with the low pressure fuel chamber 10 by a communication passage 10e (FIG. 3). When the plunger 2 is lowered, a fuel flow is generated from the sub chamber 7a to the low pressure fuel chamber 10, and when the plunger 2 is raised, a fuel flow is generated from the low pressure fuel chamber 10 to the sub chamber 7a.
このことにより、燃料ポンプ100の吸入行程もしくは、戻し行程における燃料ポンプ100内外への燃料流量を低減することができ、燃料ポンプ100内部で発生する圧力脈動を低減する機能を有している。
This makes it possible to reduce the fuel flow rate inside and outside the fuel pump 100 during the suction stroke or the return stroke of the fuel pump 100, and has a function of reducing the pressure pulsation generated inside the fuel pump 100.
図4を用いてダンパカバー周辺の詳細を説明する。図4は、図2のダンパカバー周辺の断面を示す断面図である。
The details around the damper cover will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a cross section around the damper cover of FIG.
ボディ1は、上端部に環状の凸部1bを有し、凸部1bの径方向内側に凹部1cが形成されており、凹部1cは低圧燃料室10の下端部を構成する。ダンパ9は、上下を上部支持部材21と下部支持部材22とに挟まれて、ダンパカバー20の内部に固定されている。
The body 1 has an annular convex portion 1b at the upper end portion, and a concave portion 1c is formed inside the convex portion 1b in the radial direction, and the concave portion 1c constitutes the lower end portion of the low pressure fuel chamber 10. The damper 9 is sandwiched between the upper support member 21 and the lower support member 22 at the top and bottom, and is fixed to the inside of the damper cover 20.
ダンパカバー20は、天面部20Tと、天面部20Tの外周縁部から下方に向かって延伸する側面部20Sと、を有する。天面部20Tは、上下方向(プランジャ2の軸方向)に段差を有する段付き面(上段部20T1及び下段部20T2)で構成される。
The damper cover 20 has a top surface portion 20T and a side surface portion 20S extending downward from the outer peripheral edge portion of the top surface portion 20T. The top surface portion 20T is composed of a stepped surface (upper step portion 20T1 and lower step portion 20T2) having a step in the vertical direction (axial direction of the plunger 2).
上部支持部材21はダンパカバー20の押圧部20bにより下方に押圧されている。押圧部20bは、ダンパカバー20の下段部20T2におけるボディ1側を向く面(下方を向く面)によって構成される。このため、ダンパカバー20は、上部支持部材21と当接する部位が天面部20Tの一部の範囲に限定され、上部支持部材21の周囲における燃料通路の確保が容易になる。また上部支持部材21は、最外周縁21aがダンパカバー20の側面部20Sの内周面に当接することで、低圧燃料室10内における径方向(水平方向)における位置が決められる。
The upper support member 21 is pressed downward by the pressing portion 20b of the damper cover 20. The pressing portion 20b is composed of a surface facing the body 1 side (a surface facing downward) in the lower portion 20T2 of the damper cover 20. Therefore, the portion of the damper cover 20 that comes into contact with the upper support member 21 is limited to a part of the top surface portion 20T, and it becomes easy to secure a fuel passage around the upper support member 21. Further, the position of the upper support member 21 in the radial direction (horizontal direction) in the low pressure fuel chamber 10 is determined by the outermost peripheral edge 21a coming into contact with the inner peripheral surface of the side surface portion 20S of the damper cover 20.
下部支持部材22は、ダンパカバー20の側面部20Sの内周面及びボディ1の環状の凸部1bの内周面に沿って延伸する側面部22Sと、側面部22Sの上端部から径方向内側に折り曲げられて形成された円環部22Cと、を有する。下部支持部材22の側面部22Sの外周面は、ダンパカバー20の側面部20Sの内周面に圧入固定されており、且つ、ボディ1の凸部1bの内周面にも圧入固定されている。
The lower support member 22 has a side surface portion 22S extending along the inner peripheral surface of the side surface portion 20S of the damper cover 20 and the inner peripheral surface of the annular convex portion 1b of the body 1, and a side surface portion 22S radially inside from the upper end portion of the side surface portion 22S. It has an annular portion 22C formed by being bent into a. The outer peripheral surface of the side surface portion 22S of the lower support member 22 is press-fitted and fixed to the inner peripheral surface of the side surface portion 20S of the damper cover 20, and is also press-fitted and fixed to the inner peripheral surface of the convex portion 1b of the body 1. ..
上部支持部材21及び下部支持部材22は、第2支持部材21及び第1支持部材22であり、相互にダンパ9を挟持することから第2挟持部材21及び第1挟持部材22でもある。ダンパ9は下部支持部材22上に支持され、上部支持部材21からの押圧力を受けて下部支持部材22と上部支持部材21との間に挟持されることから、下部支持部材22は支持部材と呼ばれ、上部支持部材21は押圧部材と呼ばれることもある。
The upper support member 21 and the lower support member 22 are the second support member 21 and the first support member 22, and since they sandwich the damper 9 with each other, they are also the second sandwich member 21 and the first sandwich member 22. Since the damper 9 is supported on the lower support member 22 and is sandwiched between the lower support member 22 and the upper support member 21 by receiving the pressing force from the upper support member 21, the lower support member 22 is a support member. The upper support member 21 is also called a pressing member.
下部支持部材22におけるダンパカバー20との圧入位置を20a、凸部1bとの圧入位置を1aとする。圧入部(第1圧入部)20aと圧入部(第2圧入部)1aとは、下部支持部材22の側面部22Sの外周面とダンパカバー20の側面部20Sの内周面及び凸部1bの内周面との間に構成されるため、同一円筒面上に構成される。
The press-fitting position of the lower support member 22 with the damper cover 20 is 20a, and the press-fitting position with the convex portion 1b is 1a. The press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are formed on the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface and the convex portion 1b of the side surface portion 20S of the damper cover 20. Since it is constructed between the inner peripheral surface and the inner peripheral surface, it is configured on the same cylindrical surface.
この場合、圧入部(第1圧入部)20aと圧入部(第2圧入部)1aとは、下部支持部材(支持部材)22とボディ1及びダンパカバー(カバー部)20との圧入方向(上下方向)において、異なる位置に配置される。上部支持部材21及び下部支持部材22の少なくとも一方は弾性変形させることにより、ダンパカバー20、上部支持部材21及びダンパ9の間に付勢力を与えて保持することが望ましい。
In this case, the press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are in the press-fitting direction (up and down) of the lower support member (support member) 22, the body 1 and the damper cover (cover portion) 20. In the direction), they are placed in different positions. It is desirable that at least one of the upper support member 21 and the lower support member 22 is elastically deformed to apply an urging force between the damper cover 20, the upper support member 21 and the damper 9 to hold the damper cover 20 and the lower support member 22.
具体的には、圧入部(第1圧入部)20aは、下部支持部材(支持部材)22の外周面とダンパカバー(カバー部)20の内周面との間に形成される。圧入部(第2圧入部)1aは、下部支持部材22の外周面とボディ1の内周面との間に形成される。さらに具体的には、ボディ1は、ダンパカバー20によって覆われる端部(部位)に環状の凸部1bを有する。ダンパカバー20は、天面部20Tと、天面部20Tの外周縁部から下方(ボディ1側)に向かって延伸する側面部20Sと、を有する。下部支持部材22は、ダンパカバー20の側面部20Sの内周面及びボディ1の凸部1bの内周面に沿って延伸する側面部22Sと、下部支持部材22の側面部22Sにおいて天面部20Tの側の端部から径方向内側に折り曲げられて形成された円環部20Cと、を有する。圧入部20aは、下部支持部材22の側面部22Sの外周面とダンパカバー20の側面部20Sの内周面との間に形成される。圧入部1aは、下部支持部材22の側面部22Sの外周面と環状の凸部1bの内周面との間に形成される。
Specifically, the press-fitting portion (first press-fitting portion) 20a is formed between the outer peripheral surface of the lower support member (support member) 22 and the inner peripheral surface of the damper cover (cover portion) 20. The press-fitting portion (second press-fitting portion) 1a is formed between the outer peripheral surface of the lower support member 22 and the inner peripheral surface of the body 1. More specifically, the body 1 has an annular convex portion 1b at an end (portion) covered by the damper cover 20. The damper cover 20 has a top surface portion 20T and a side surface portion 20S extending downward (body 1 side) from the outer peripheral edge portion of the top surface portion 20T. The lower support member 22 has a side surface portion 22S extending along the inner peripheral surface of the side surface portion 20S of the damper cover 20 and the inner peripheral surface of the convex portion 1b of the body 1, and a top surface portion 20T on the side surface portion 22S of the lower support member 22. It has an annular portion 20C formed by being bent inward in the radial direction from the end portion on the side of. The press-fitting portion 20a is formed between the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface of the side surface portion 20S of the damper cover 20. The press-fitting portion 1a is formed between the outer peripheral surface of the side surface portion 22S of the lower support member 22 and the inner peripheral surface of the annular convex portion 1b.
すなわち、本実施例の燃料ポンプ100は、ボディ1と、ボディ1を覆うダンパカバー(カバー部)20と、ダンパ(被収容部)9を支持する下部支持部材(支持部材)22と、下部支持部材22とダンパカバー20との間に形成され下部支持部材22をダンパカバー20に固定する圧入部(第1圧入部)20aと、下部支持部材22とボディ1との間に形成され下部支持部材22の圧入部20aが形成される面と同一面(側面部22Sの外周面部)に形成され、下部支持部材22をボディ1に固定する圧入部(第2圧入部)1aと、を備える。
That is, in the fuel pump 100 of this embodiment, the body 1, the damper cover (cover portion) 20 that covers the body 1, the lower support member (support member) 22 that supports the damper (accommodated portion) 9, and the lower support A press-fitting portion (first press-fitting portion) 20a formed between the member 22 and the damper cover 20 to fix the lower support member 22 to the damper cover 20, and a lower support member formed between the lower support member 22 and the body 1. The press-fitting portion (second press-fitting portion) 1a, which is formed on the same surface as the surface on which the press-fitting portion 20a of the 22 is formed (the outer peripheral surface portion of the side surface portion 22S) and fixes the lower support member 22 to the body 1, is provided.
さらに、ダンパカバー(カバー部)20の内周側にはダンパ(ダンパ機構)9が配置され、下部支持部材(支持部材)22は圧入部(第1圧入部)20aにより、ダンパ9をダンパカバー20の下面(天面部20Tの裏面)に接触させた状態で保持される。
Further, a damper (damper mechanism) 9 is arranged on the inner peripheral side of the damper cover (cover portion) 20, and the lower support member (support member) 22 covers the damper 9 with the press-fitting portion (first press-fitting portion) 20a. It is held in contact with the lower surface of 20 (the back surface of the top surface portion 20T).
ダンパカバー(カバー部)20の側面部20Sの下端部(側面部20Sの下端部)とボディ1の凸部1bの上端部(凸部1bの上端部)とは、接触するように配置されて突き当て部(接触面)BUが構成され、突き当て部BUの位置で溶接される。この場合、圧入部(第1圧入部)20a及び圧入部(第2圧入部)1aは、下部支持部材(支持部材)22とボディ1及びダンパカバー20との圧入方向(上下方向)において、ダンパカバー20とボディ1との突き当て部(接触面)BUからほぼ同じ距離の範囲まで形成される。本実施例では、圧入部20aはl20に示す範囲であり、圧入部1aはl1に示す範囲であり、l20とl1とは等しい(l20=l1)。これにより、下部支持部材22の圧入部20aにおけるダンパカバー20に対する固定力と圧入部1aにおけるボディ1に対する固定力とを同等にすることができ、ダンパカバー20とボディ1とを安定した状態で固定することができる。
The lower end of the side surface 20S of the damper cover (cover portion) 20 (lower end of the side surface 20S) and the upper end of the convex portion 1b of the body 1 (upper end of the convex portion 1b) are arranged so as to be in contact with each other. The abutting portion (contact surface) BU is formed and welded at the position of the abutting portion BU. In this case, the press-fitting portion (first press-fitting portion) 20a and the press-fitting portion (second press-fitting portion) 1a are dampers in the press-fitting direction (vertical direction) of the lower support member (support member) 22, the body 1 and the damper cover 20. It is formed up to a range of substantially the same distance from the abutting portion (contact surface) BU between the cover 20 and the body 1. In this embodiment, the press-fitting portion 20a is the range shown in l20, the press-fitting portion 1a is the range shown in l1, and l20 and l1 are equal (l20 = l1). As a result, the fixing force of the lower support member 22 to the damper cover 20 at the press-fitting portion 20a can be made equal to the fixing force of the press-fitting portion 1a to the body 1, and the damper cover 20 and the body 1 can be fixed in a stable state. can do.
溶接部Wに溶融部のイメージを破線で示す。溶接部の大きさは溶接条件により異なるため、本図のイメージは一例として示す。ダンパカバー(カバー部)20とボディ1とを固定する溶接部Wは、下部支持部材(支持部材)22の径方向外側に設けられる。すなわち、ダンパカバー20及びボディ1の径方向外側から溶接部Wにレーザを照射して溶接を行う。この溶接部Wは、ダンパカバー20の下端部(側面部20Sの下端部)とボディ1の上端部(凸部1bの上端部)との接触面に、ダンパカバー20側とボディ1側とに跨るように設けられる。
The image of the molten part is shown by a broken line on the welded part W. Since the size of the welded portion varies depending on the welding conditions, the image in this figure is shown as an example. The welded portion W for fixing the damper cover (cover portion) 20 and the body 1 is provided on the radial outer side of the lower support member (support member) 22. That is, the welded portion W is irradiated with a laser from the radial outside of the damper cover 20 and the body 1 to perform welding. The welded portion W is provided on the contact surface between the lower end portion of the damper cover 20 (lower end portion of the side surface portion 20S) and the upper end portion of the body 1 (upper end portion of the convex portion 1b), and on the damper cover 20 side and the body 1 side. It is provided so as to straddle.
ダンパカバー20及びボディ1は、下部支持部材22に対する圧入部20a及び圧入部1aにより固定されているため、突き当て部BUにおける溶接部Wは、溶融部が下部支持部材22の側面部22Sに届かない範囲に止め、燃料のシールだけを行うようにしてもよい。しかし本実施例では、溶接部Wの溶融部は、下部支持部材22の側面部22Sに達し、側面部22Sの厚み方向の一部(外周側)を溶融させる深さとする。すなわち、溶接部Wは、下部支持部材(支持部材)22の厚み方向の一部を溶融させる深さに形成され、下部支持部材22の厚み方向の他部に非溶融部が残存する。
Since the damper cover 20 and the body 1 are fixed by the press-fitting portion 20a and the press-fitting portion 1a to the lower support member 22, the welded portion W in the abutting portion BU reaches the side surface portion 22S of the lower support member 22. It may be stopped within a range that does not exist and only the fuel is sealed. However, in this embodiment, the molten portion of the welded portion W reaches the side surface portion 22S of the lower support member 22 and has a depth at which a part (outer peripheral side) of the side surface portion 22S in the thickness direction is melted. That is, the welded portion W is formed to a depth that melts a part of the lower support member (support member) 22 in the thickness direction, and a non-melted portion remains in the other portion of the lower support member 22 in the thickness direction.
これにより、ダンパカバー20のボディ1に対する固定を確実にすることができる。ただし、溶接部Wの溶融部が側面部22Sの厚み方向の全体を溶融させる深さになると、ダンパカバー20のボディ1に対する固定状態を維持できなくなる。このため、溶接部Wの溶融部は側面部22Sの厚み方向の一部を溶融させる深さとし、側面部22Sの厚み方向の全体を溶融させない深さとする。
This makes it possible to ensure that the damper cover 20 is fixed to the body 1. However, when the molten portion of the welded portion W has a depth that melts the entire side surface portion 22S in the thickness direction, the fixed state of the damper cover 20 with respect to the body 1 cannot be maintained. Therefore, the molten portion of the welded portion W has a depth at which a part of the side surface portion 22S in the thickness direction is melted, and a depth at which the entire side surface portion 22S in the thickness direction is not melted.
上記構成により、溶接時に発生するスパッタを下部支持部材22で抑え込むことができ、スパッタ飛散を防止できる。また、圧入部20a及び圧入部1aは、溶接部Wから圧入方向(側面部22Sの外周面に沿う方向)に離れた位置まで設けられているため、溶接中に溶融されない部分が残り、ダンパカバー20とボディ1との固定状態が維持される。そのため、溶接作業中にダンパカバー20とボディ1とを固定する治具等が組立て設備には不要となる。また、圧入部20a及び圧入部1aは、下部支持部材22の側面部22Sによる同一円筒面上に構成されるため、下部支持部材22の側面部22Sの円筒面をシンプルな方法で、且つ精度よく加工することができるため、圧入部20a及び圧入部1aの同軸度を出しやすい。
With the above configuration, spatter generated during welding can be suppressed by the lower support member 22, and spatter scattering can be prevented. Further, since the press-fitting portion 20a and the press-fitting portion 1a are provided up to positions separated from the welded portion W in the press-fitting direction (direction along the outer peripheral surface of the side surface portion 22S), a portion that is not melted during welding remains, and the damper cover. The fixed state of 20 and the body 1 is maintained. Therefore, a jig or the like for fixing the damper cover 20 and the body 1 during the welding operation is not required for the assembly equipment. Further, since the press-fitting portion 20a and the press-fitting portion 1a are formed on the same cylindrical surface by the side surface portion 22S of the lower support member 22, the cylindrical surface of the side surface portion 22S of the lower support member 22 can be formed with a simple method and with high accuracy. Since it can be processed, it is easy to obtain the coaxiality of the press-fitting portion 20a and the press-fitting portion 1a.
言い換えれば、圧入部20a及び圧入部1aは、圧入方向(上下方向)において、近接して配置され、溶接部Wは圧入部20a及び圧入部1aの近接部を溶融させる。このため、圧入部20a、溶接部W及び圧入部1aは、圧入方向(上下方向)において、この順番に隣接して配置されることになる。
In other words, the press-fitting portion 20a and the press-fitting portion 1a are arranged close to each other in the press-fitting direction (vertical direction), and the welded portion W melts the proximity portion of the press-fitting portion 20a and the press-fitting portion 1a. Therefore, the press-fitting portion 20a, the welding portion W, and the press-fitting portion 1a are arranged adjacent to each other in this order in the press-fitting direction (vertical direction).
本実施例では下部保持部材22の下端面とボディ1との間には隙間gを設ける。すなわち、ダンパカバー(カバー部)20の側面部20Sの下端部(反天面側の端部)がボディ1の環状の凸部1bの上端部(ダンパカバー20側の端部)と接触した状態において、下部支持部材(支持部材)22の側面部22Sの下端部は、環状の凸部1bの内側に形成される凹部の底面1dと非接触となるように配置されている。この隙間gにより、ダンパカバー20の組立時に下部保持部材22がボディ1の凸部1bによって形成される凹部1cの底面1dに接触した状態で押し込まれることを防ぎ、上部保持部材21と下部保持部材20とに過度な応力が発生しないようにできる。しかし、もし上部保持部材21または下部保持部材22が十分な弾性変形をできるなら、下部保持部材22の下端面とボディ1の間には隙間を設けない設計をすることも実現的である。
In this embodiment, a gap g is provided between the lower end surface of the lower holding member 22 and the body 1. That is, a state in which the lower end portion (end portion on the anti-top surface side) of the side surface portion 20S of the damper cover (cover portion) 20 is in contact with the upper end portion (end portion on the damper cover 20 side) of the annular convex portion 1b of the body 1. The lower end of the side surface portion 22S of the lower support member (support member) 22 is arranged so as to be in non-contact with the bottom surface 1d of the concave portion formed inside the annular convex portion 1b. This gap g prevents the lower holding member 22 from being pushed in contact with the bottom surface 1d of the concave portion 1c formed by the convex portion 1b of the body 1 when the damper cover 20 is assembled, and prevents the upper holding member 21 and the lower holding member 22 from being pushed in. It is possible to prevent excessive stress from being generated at 20. However, if the upper holding member 21 or the lower holding member 22 can be sufficiently elastically deformed, it is also feasible to design so as not to provide a gap between the lower end surface of the lower holding member 22 and the body 1.
図5は、ボディ組付け前のダンパカバーサブアセンブリの断面を示す断面図である。図5の断面位置は図4とは異なる。
FIG. 5 is a cross-sectional view showing a cross section of the damper cover subassembly before assembling the body. The cross-sectional position of FIG. 5 is different from that of FIG.
下部保持部材22はダンパカバー20に圧入部(圧入位置)20aで圧入固定されており、ダンパカバー20には上部支持部材21、ダンパ9及び下部支持部材22がサブアセンブリとして組み立てられている。このように独立してユニット化したダンパカバーサブアセンブリを構成した上で、このダンパカバーサブアセンブリをボディ1に組み付けるようにすることにより、ダンパカバー20、上部支持部材21、ダンパ9及び下部支持部材22のボディへ1の組み付けを簡素化できる。
The lower holding member 22 is press-fitted and fixed to the damper cover 20 at a press-fitting portion (press-fitting position) 20a, and the upper support member 21, the damper 9 and the lower support member 22 are assembled as a subassembly on the damper cover 20. By constructing the damper cover sub-assembly that is independently unitized in this way and then assembling this damper cover sub-assembly to the body 1, the damper cover 20, the upper support member 21, the damper 9, and the lower support member are assembled. Assembling 1 to 22 bodies can be simplified.
ダンパカバー20には吸入配管5を取り付けることが可能である。本実施例では吸入流路5a内に吸入フィルタ17を設け、燃料タンク103から燃料ポンプ100の内部に所定のサイズ以上の異物を流入しないようにする。ダンパカバー20内に入った燃料は上部支持部材21の隙間流路(上下連通孔)20cと下部支持部材22の隙間流路(上下連通孔)20dとを通りぬけ、吸入通路10dへ流れる。
The suction pipe 5 can be attached to the damper cover 20. In this embodiment, a suction filter 17 is provided in the suction flow path 5a to prevent foreign matter of a predetermined size or larger from flowing from the fuel tank 103 into the fuel pump 100. The fuel that has entered the damper cover 20 passes through the gap flow path (upper and lower communication holes) 20c of the upper support member 21 and the gap flow path (upper and lower communication holes) 20d of the lower support member 22 and flows to the suction passage 10d.
上部支持部材21及び下部支持部材22の両方、またはいずれか一方は、1枚のプレス板で形成されることが望ましい。さらに上部支持部材21及び下部支持部材22には、ダンパ9を保持する部位とは別の部位、具体的には外周側に、上下連通孔20c及び20dがプレス加工により形成されることが望ましい。この構成により安価な構成で吸入配管5からボディ側への燃料の通路を確保することが可能である。
It is desirable that the upper support member 21 and / or one of the lower support members 22 are formed of one press plate. Further, it is desirable that the upper support member 21 and the lower support member 22 are formed with upper and lower communication holes 20c and 20d by press working on a portion different from the portion that holds the damper 9, specifically, on the outer peripheral side. With this configuration, it is possible to secure a fuel passage from the suction pipe 5 to the body side with an inexpensive configuration.
本実施例では吸入配管5を燃料ポンプ100の上部に設ける例を示したが、エンジンレイアウトによっては吸入配管5が別の位置にあることが望ましい場合がある。例えばエンジンからの燃料配管の取り回しが燃料ポンプ100の上部に配置しにくい場合は、ボディ1の中央部に吸入配管5を設けても良い。その場合はダンパカバー20に吸入配管5を設けなくても良い。
In this embodiment, the suction pipe 5 is provided above the fuel pump 100, but it may be desirable that the suction pipe 5 is located at a different position depending on the engine layout. For example, if it is difficult to arrange the fuel pipe from the engine in the upper part of the fuel pump 100, the suction pipe 5 may be provided in the central portion of the body 1. In that case, it is not necessary to provide the suction pipe 5 on the damper cover 20.
以上の構成により、少ない部品点数にて、低コストでダンパカバー20をボディ1に溶接することができる。
With the above configuration, the damper cover 20 can be welded to the body 1 at low cost with a small number of parts.
本実施例では、ダンパカバー20をボディ1に固定する例を説明しているが、本実施例はその他のカバーをボディ1に固定する場合にも適用可能である。ダンパカバー20に限定することなくその他のカバーを含む部材を、カバー部と呼ぶこととする。またボディ1に収容されカバー部で覆われる部品は、被収容部(本実施例のダンパ9に相当する部品)と呼ぶこととする。
In this embodiment, an example in which the damper cover 20 is fixed to the body 1 is described, but this embodiment can also be applied to the case where other covers are fixed to the body 1. A member including other covers without being limited to the damper cover 20 is referred to as a cover portion. Further, the part housed in the body 1 and covered with the cover part is referred to as a housed part (a part corresponding to the damper 9 of this embodiment).
なお、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。
例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも全ての構成を備えるものに限定されるものではない。また、実施例の構成の一部を他の構成に置き換えることが可能であり、実施例の構成に他の構成を追加することが可能である。 The present invention is not limited to the above-described examples, and includes various modifications.
For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the configurations. Further, it is possible to replace a part of the configuration of the embodiment with another configuration, and it is possible to add another configuration to the configuration of the embodiment.
例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも全ての構成を備えるものに限定されるものではない。また、実施例の構成の一部を他の構成に置き換えることが可能であり、実施例の構成に他の構成を追加することが可能である。 The present invention is not limited to the above-described examples, and includes various modifications.
For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the configurations. Further, it is possible to replace a part of the configuration of the embodiment with another configuration, and it is possible to add another configuration to the configuration of the embodiment.
1…ボディ、1a…第2圧入部、2…プランジャ、3…電磁吸入弁機構、3h…アンカ、3i…ロッド、4…リリーフ弁機構、5…吸入配管、6…シリンダ、7…シールホルダ、8…吐出弁機構、9…ダンパ、10a…低圧燃料吸入口、11…加圧室、12…吐出ジョイント、13…プランジャシール、20…ダンパカバー、20a…第1圧入部、21…上部支持部材、22…下部支持部材、W…溶接部。
1 ... Body, 1a ... Second press-fitting part, 2 ... Plunger, 3 ... Electromagnetic suction valve mechanism, 3h ... Anchor, 3i ... Rod, 4 ... Relief valve mechanism, 5 ... Suction pipe, 6 ... Cylinder, 7 ... Seal holder, 8 ... Discharge valve mechanism, 9 ... Damper, 10a ... Low pressure fuel suction port, 11 ... Pressurization chamber, 12 ... Discharge joint, 13 ... Plunger seal, 20 ... Damper cover, 20a ... First press-fitting part, 21 ... Upper support member , 22 ... Lower support member, W ... Welded part.
Claims (13)
- ボディと、
前記ボディを覆うカバー部と、
被収容部を支持する支持部材と、
前記支持部材と前記カバー部との間に形成され、前記支持部材を前記カバー部に固定する第1圧入部と、
前記支持部材と前記ボディとの間に形成され、前記支持部材の前記第1圧入部が形成される面と同一面に形成され、前記支持部材を前記ボディに固定する第2圧入部と、を備えた燃料ポンプ。 With the body
A cover portion that covers the body and
Support members that support the accommodation part and
A first press-fitting portion formed between the support member and the cover portion and fixing the support member to the cover portion,
A second press-fitting portion formed between the support member and the body, formed on the same surface as the surface on which the first press-fitting portion of the support member is formed, and fixing the support member to the body. Equipped fuel pump. - 請求項1に記載の燃料ポンプにおいて、
前記第1圧入部と前記第2圧入部とは、前記支持部材と前記ボディ及び前記カバー部との圧入方向において、異なる位置に配置される燃料ポンプ。 In the fuel pump according to claim 1,
The first press-fitting portion and the second press-fitting portion are fuel pumps arranged at different positions in the press-fitting direction of the support member, the body, and the cover portion. - 請求項2に記載の燃料ポンプにおいて、
前記支持部材の径方向外側に、前記カバー部と前記ボディとを固定する溶接部を備えた燃料ポンプ。 In the fuel pump according to claim 2.
A fuel pump provided with a welded portion for fixing the cover portion and the body on the radial outer side of the support member. - 請求項3に記載の燃料ポンプにおいて、
前記第1圧入部及び前記第2圧入部は、前記カバー部と前記ボディとの前記圧入方向における接触面から、前記圧入方向のほぼ同じ距離の範囲まで形成される燃料ポンプ。 In the fuel pump according to claim 3,
The first press-fitting portion and the second press-fitting portion are fuel pumps formed from a contact surface between the cover portion and the body in the press-fitting direction to a range of substantially the same distance in the press-fitting direction. - 請求項3に記載の燃料ポンプにおいて、
前記第1圧入部は、前記支持部材の外周面と前記カバー部の内周面との間に形成される燃料ポンプ。 In the fuel pump according to claim 3,
The first press-fitting portion is a fuel pump formed between the outer peripheral surface of the support member and the inner peripheral surface of the cover portion. - 請求項3に記載の燃料ポンプにおいて、
前記第2圧入部は、前記支持部材の外周面と前記ボディの内周面との間に形成される燃料ポンプ。 In the fuel pump according to claim 3,
The second press-fitting portion is a fuel pump formed between the outer peripheral surface of the support member and the inner peripheral surface of the body. - 請求項3に記載の燃料ポンプにおいて、
前記ボディは、前記カバー部によって覆われる部位に環状の凸部を有し、
前記カバー部は、天面部と、天面部の外周縁部から前記ボディの側に向かって延伸する側面部と、を有し、
前記支持部材は、前記カバー部の側面部の内周面及び前記ボディの前記凸部の内周面に沿って延伸する側面部を有し、
前記第1圧入部は、前記支持部材の側面部の外周面と前記カバー部の側面部の内周面との間に形成され、
前記第2圧入部は、前記支持部材の側面部の外周面と前記環状の凸部の内周面との間に形成される燃料ポンプ。 In the fuel pump according to claim 3,
The body has an annular protrusion at a portion covered by the cover portion.
The cover portion has a top surface portion and a side surface portion extending from the outer peripheral edge portion of the top surface portion toward the side of the body.
The support member has an inner peripheral surface of a side surface portion of the cover portion and a side surface portion extending along the inner peripheral surface of the convex portion of the body.
The first press-fitting portion is formed between the outer peripheral surface of the side surface portion of the support member and the inner peripheral surface of the side surface portion of the cover portion.
The second press-fitting portion is a fuel pump formed between an outer peripheral surface of a side surface portion of the support member and an inner peripheral surface of the annular convex portion. - 請求項3に記載の燃料ポンプにおいて、
前記カバー部の下端部が前記ボディの上端部と接触するように配置される燃料ポンプ。 In the fuel pump according to claim 3,
A fuel pump arranged so that the lower end portion of the cover portion comes into contact with the upper end portion of the body. - 請求項3に記載の燃料ポンプにおいて、
前記カバー部の内周側にはダンパ機構が配置され、
前記支持部材は前記第1圧入部により、前記ダンパ機構を前記カバー部の下面に接触させた状態で保持される燃料ポンプ。 In the fuel pump according to claim 3,
A damper mechanism is arranged on the inner peripheral side of the cover portion.
The support member is a fuel pump held by the first press-fitting portion in a state where the damper mechanism is in contact with the lower surface of the cover portion. - 請求項3に記載の燃料ポンプにおいて、
前記ボディは、前記カバー部によって覆われる部位に環状の凸部を有し、
前記カバー部の下端部が前記環状の凸部の上端部と接触した状態において、前記支持部材の下端部は、前記環状の凸部の内側に形成される凹部の底面と非接触となるように配置されている燃料ポンプ。 In the fuel pump according to claim 3,
The body has an annular protrusion at a portion covered by the cover portion.
In a state where the lower end portion of the cover portion is in contact with the upper end portion of the annular convex portion, the lower end portion of the support member is not in contact with the bottom surface of the concave portion formed inside the annular convex portion. The fuel pump that is located. - 請求項8に記載の燃料ポンプにおいて、
前記カバー部の下端部と前記ボディの上端部との接触面に前記溶接部を備えた燃料ポンプ。 In the fuel pump according to claim 8.
A fuel pump having the welded portion on a contact surface between the lower end portion of the cover portion and the upper end portion of the body. - 請求項11に記載の燃料ポンプにおいて、
前記溶接部は、前記支持部材の厚み方向の一部を溶融させる深さに形成され、前記支持部材の厚み方向の他部に非溶融部が残存する燃料ポンプ。 In the fuel pump according to claim 11,
A fuel pump in which the welded portion is formed to a depth that melts a part of the support member in the thickness direction, and a non-melted portion remains in the other portion of the support member in the thickness direction. - ボディと、
前記ボディを覆うダンパカバーと、
ダンパ及びダンパを支持する支持部材と、
前記支持部材と前記ダンパカバーとの間に形成され、前記支持部材を前記ダンパカバーに固定する第1圧入部と、
前記支持部材と前記ボディとの間に形成され、前記支持部材の前記第1圧入部が形成される面と同一面に形成され、前記支持部材を前記ボディに固定する第2圧入部と、を備え、
前記ボディは、前記ダンパカバーによって覆われる端部に環状の凸部を有し、
前記ダンパカバーは、天面部と、天面部の外周縁部から前記ボディの側に向かって延伸する側面部と、を有し、
前記支持部材は、前記ダンパカバーの側面部の内周面及び前記ボディの前記凸部の内周面に沿って延伸する側面部を有し、
前記第1圧入部は、前記支持部材の側面部の外周面と前記ダンパカバーの側面部の内周面との間に形成され、
前記第2圧入部は、前記支持部材の側面部の外周面と前記環状の凸部の内周面との間に形成され、
前記ダンパカバーの側面部の下端部と前記ボディの前記環状の凸部の上端部との突き合わせ部に溶接部を有し、
前記第1圧入部、前記溶接部及び前記第2圧入部は、圧入方向(上下方向)において、この順番に隣接して配置される燃料ポンプ。 With the body
The damper cover that covers the body and
The damper and the support member that supports the damper,
A first press-fitting portion formed between the support member and the damper cover and fixing the support member to the damper cover,
A second press-fitting portion formed between the support member and the body, formed on the same surface as the surface on which the first press-fitting portion of the support member is formed, and fixing the support member to the body. Prepare
The body has an annular protrusion at the end covered by the damper cover.
The damper cover has a top surface portion and a side surface portion extending from the outer peripheral edge portion of the top surface portion toward the body side.
The support member has an inner peripheral surface of a side surface portion of the damper cover and a side surface portion extending along the inner peripheral surface of the convex portion of the body.
The first press-fitting portion is formed between the outer peripheral surface of the side surface portion of the support member and the inner peripheral surface of the side surface portion of the damper cover.
The second press-fitting portion is formed between the outer peripheral surface of the side surface portion of the support member and the inner peripheral surface of the annular convex portion.
A welded portion is provided at the abutting portion between the lower end portion of the side surface portion of the damper cover and the upper end portion of the annular convex portion of the body.
A fuel pump in which the first press-fitting portion, the welded portion, and the second press-fitting portion are arranged adjacent to each other in this order in the press-fitting direction (vertical direction).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021508196A JP7055933B2 (en) | 2019-03-28 | 2020-02-07 | Fuel pump |
DE112020000678.6T DE112020000678T5 (en) | 2019-03-28 | 2020-02-07 | Fuel pump |
CN202080017585.1A CN113574267B (en) | 2019-03-28 | 2020-02-07 | Fuel pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2019-063094 | 2019-03-28 | ||
JP2019063094 | 2019-03-28 |
Publications (1)
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WO2020195222A1 true WO2020195222A1 (en) | 2020-10-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2020/004726 WO2020195222A1 (en) | 2019-03-28 | 2020-02-07 | Fuel pump |
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JP (1) | JP7055933B2 (en) |
CN (1) | CN113574267B (en) |
DE (1) | DE112020000678T5 (en) |
WO (1) | WO2020195222A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012251467A (en) * | 2011-06-02 | 2012-12-20 | Hitachi Automotive Systems Ltd | Fuel pressure pulsation reducing mechanism and high-pressure fuel supply pump of internal combustion engine equipped with the same |
JP2018071443A (en) * | 2016-10-31 | 2018-05-10 | 日立オートモティブシステムズ株式会社 | Fuel supply pump |
JP2018087578A (en) * | 2018-03-13 | 2018-06-07 | 日立オートモティブシステムズ株式会社 | Pressure pulsation reduction mechanism for fuel and high pressure fuel supply pump of internal combustion engine including the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4686501B2 (en) * | 2007-05-21 | 2011-05-25 | 日立オートモティブシステムズ株式会社 | Liquid pulsation damper mechanism and high-pressure fuel supply pump having liquid pulsation damper mechanism |
JP5682335B2 (en) * | 2011-01-28 | 2015-03-11 | 株式会社デンソー | High pressure pump |
JP6430354B2 (en) * | 2015-09-30 | 2018-11-28 | 日立オートモティブシステムズ株式会社 | High pressure fuel supply pump |
-
2020
- 2020-02-07 DE DE112020000678.6T patent/DE112020000678T5/en active Granted
- 2020-02-07 CN CN202080017585.1A patent/CN113574267B/en active Active
- 2020-02-07 JP JP2021508196A patent/JP7055933B2/en active Active
- 2020-02-07 WO PCT/JP2020/004726 patent/WO2020195222A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012251467A (en) * | 2011-06-02 | 2012-12-20 | Hitachi Automotive Systems Ltd | Fuel pressure pulsation reducing mechanism and high-pressure fuel supply pump of internal combustion engine equipped with the same |
JP2018071443A (en) * | 2016-10-31 | 2018-05-10 | 日立オートモティブシステムズ株式会社 | Fuel supply pump |
JP2018087578A (en) * | 2018-03-13 | 2018-06-07 | 日立オートモティブシステムズ株式会社 | Pressure pulsation reduction mechanism for fuel and high pressure fuel supply pump of internal combustion engine including the same |
Also Published As
Publication number | Publication date |
---|---|
JP7055933B2 (en) | 2022-04-18 |
DE112020000678T5 (en) | 2021-11-11 |
CN113574267A (en) | 2021-10-29 |
CN113574267B (en) | 2023-05-26 |
JPWO2020195222A1 (en) | 2021-10-21 |
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