JP2018013071A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device including a storage device, capable of achieving a smaller size, a lighter weight and a lower cost.SOLUTION: A fuel supply device 10 includes a fuel pump 12 and a storage device 16. The fuel pump 12 sucks fuel from a fuel tank 18, and pressurizes and discharge it. The storage device 16 stores the pressurized fuel discharged from the fuel pump 12, and supplies the pressurized fuel to a fuel injection valve 22. The storage device 16 is arranged in the fuel tank 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel supply device that supplies fuel in a fuel tank to a fuel injection device of an engine (internal combustion engine) mounted on a vehicle such as an automobile.

  Conventionally, a fuel pump that sucks and pressurizes and discharges fuel in a fuel tank, and a storage device that stores the pressurized fuel discharged from the fuel pump and supplies the pressurized fuel to the fuel injection device. There is a fuel supply device (see, for example, Patent Document 1).

JP 2000-205082 A

  In the fuel supply device of Patent Document 1, since the storage device is disposed outside the fuel tank, there is a risk of fuel leakage from the storage device. Accordingly, there is a problem that the storage device is required to have high sealing performance and strength, and the size and weight are inevitably increased. The problem to be solved by the present invention is to provide a fuel supply device including a storage device that can be reduced in size, weight, and cost.

  The above problem can be solved by the fuel supply device of the present invention. A first invention is a fuel pump that sucks and pressurizes and discharges fuel in a fuel tank, and stores a pressurized fuel discharged from the fuel pump and supplies the pressurized fuel to a fuel injection device. The storage device is a fuel supply device disposed in the fuel tank. According to this configuration, since the storage device provided in the fuel supply device is disposed in the fuel tank, the sealing performance and the strength may be lower than those of the storage device disposed outside the fuel tank. Therefore, the storage device can be reduced in size and weight and cost.

  In a second aspect based on the first aspect, the storage device includes a cylinder body, a movable partition wall, and an urging member. The cylinder body includes a cylinder chamber, and the movable partition wall includes: The cylinder chamber is provided so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber, and the biasing member biases the movable partition wall in the reduction direction of the storage chamber. And a plurality of the urging members are arranged in parallel. According to this configuration, a plurality of urging members for urging the movable partition wall of the storage device in the reduction direction of the storage chamber are arranged in parallel. For this reason, compared with a single urging member, the spring load can be distributed to each urging member, and the spring constant and weight of each urging member can be reduced. Thereby, the assembling property of each urging member can be improved.

  In a third aspect based on the first aspect, the storage device includes a cylinder body, a movable partition wall, and an urging member. The cylinder body includes a cylinder chamber, and the movable partition wall includes: The cylinder chamber is provided so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber, and the biasing member biases the movable partition wall in the reduction direction of the storage chamber. The urging member is a fuel supply device arranged in a plurality of multiple annular shapes. According to this configuration, a plurality of urging members for urging the movable partition wall of the storage device in the reduction direction of the storage chamber are arranged in multiple rings. For this reason, compared with a single urging member, the spring load can be distributed to each urging member, and the spring constant and weight of each urging member can be reduced. Thereby, the assembling property of each urging member can be improved. Further, it is possible to suppress the uneven load on the movable partition wall and to suppress the inclination of the movable partition wall due to the uneven load. Therefore, the operability of the movable partition can be improved. Moreover, the space utilization factor of the hollow part of the urging member on the outer ring side can be increased by arranging the coil spring on the inner ring side inside the urging member on the outer ring side.

  In a fourth aspect based on the first aspect, the storage device includes a cylinder body, a plurality of movable partition walls, and a plurality of urging members, and the cylinder body includes a plurality of parallelly formed plurality. Each movable partition is provided in each cylinder chamber so as to be axially displaceable, and the cylinder chamber is partitioned into a storage chamber and a back pressure chamber, and each of the biasing members Is a fuel supply device that urges each movable partition wall in the shrinking direction of each storage chamber. According to this configuration, a plurality of urging members are formed together with the movable partition wall of the storage device. For this reason, compared with a single urging member, the spring load can be distributed to each urging member, and the spring constant and weight of each urging member can be reduced. Thereby, the assembling property of each urging member can be improved. Further, the cylinder body of the storage device has a plurality of cylinder chambers formed in parallel. For this reason, compared with the case where a cylinder main body has one cylinder chamber, the intensity | strength of the axial direction and radial direction of a cylinder main body can be improved because the number of the side wall parts of a cylinder chamber increases.

  In a fifth aspect based on the first aspect, the storage device includes a cylinder body, a movable partition wall, and an urging member. The cylinder body includes a cylinder chamber, and the movable partition wall includes: The cylinder chamber is provided so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber, and the biasing member biases the movable partition wall in the reduction direction of the storage chamber. And a plurality of the urging members are arranged in series. According to this configuration, a plurality of urging members for urging the movable partition wall of the storage device in the reduction direction of the storage chamber are arranged in series. For this reason, compared with a single urging member, the spring load can be distributed to each urging member, and the spring constant and weight of each urging member can be reduced. Thereby, the assembling property of each urging member can be improved.

  In a sixth aspect based on the first aspect, the storage device includes a cylinder body, a movable partition wall, and an urging member. The cylinder body includes a cylinder chamber, and the movable partition wall includes: The cylinder chamber is provided so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber, and the biasing member biases the movable partition wall in the reduction direction of the storage chamber. The fuel supply device includes a booster mechanism that boosts and transmits the biasing force of the biasing member to the movable partition wall. According to this configuration, the booster mechanism that boosts the urging force of the urging member that urges the movable partition wall of the storage device in the reduction direction of the storage chamber is transmitted to the movable partition wall. Therefore, the spring load of the urging member can be reduced.

  According to a seventh invention, in any one of the first to sixth inventions, the cylinder body of the storage device is made of a resin cylinder member that forms at least a side wall portion of the cylinder chamber, and a metal that reinforces the cylinder member A fuel supply device. According to this structure, the moldability of the cylinder chamber and the slidability of the movable partition wall (for example, piston) can be ensured by the resin cylinder member of the cylinder body of the storage device. Moreover, the reliability of a cylinder main body can be improved by reinforcing a cylinder member with a metal frame member.

  In an eighth aspect based on the first aspect, the storage device includes a cylinder body, a movable partition wall, and an urging member. The cylinder body includes a cylinder chamber, and the movable partition wall includes: The cylinder chamber is provided so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber, and the biasing member biases the movable partition wall in the reduction direction of the storage chamber. The storage chamber communicates with a high-pressure fuel passage through which pressurized fuel discharged from the fuel pump flows, and the back-pressure chamber communicates with a low-pressure fuel passage through which fuel sucked into the fuel pump flows. A fuel supply device communicated with the fuel supply device. According to this configuration, when the fuel consumption of the fuel injection device is small, the pressurized fuel discharged from the fuel pump is accumulated in the accumulation chamber via the high-pressure side fuel passage. Further, when the fuel pump is stopped, the fuel in the storage chamber is supplied to the high-pressure side fuel passage by the biasing force of the biasing member. At this time, the fuel in the low pressure side fuel passage is sucked into the back pressure chamber by the increase in the volume of the back pressure chamber accompanying the decrease in the volume of the accumulation chamber. Further, the fuel in the back pressure chamber is discharged into the low pressure side fuel passage by the volume reduction of the back pressure chamber accompanying the increase in the volume of the accumulation chamber accompanying the accumulation of pressurized fuel in the accumulation chamber. Therefore, the back pressure chamber of the storage device can be used to reduce pump work and improve volumetric efficiency.

  According to a ninth invention, in the first invention, a flow-rate type fuel pressure regulating valve that regulates the fuel pressure without discharging pressurized fuel into the fuel passage in the fuel tank downstream of the storage device. Is a fuel supply device. According to this configuration, the fuel pressure can be adjusted without discharging the pressurized fuel in the fuel passage by the flow restrictor type fuel pressure adjusting valve provided in the fuel passage downstream of the storage device in the fuel tank. it can. For this reason, the pressure detection device for detecting the fuel pressure in the fuel passage downstream of the storage device in the fuel tank is omitted, and there is no need to control the fuel pump by the control device based on the pressure detection device.

  In a tenth aspect based on the ninth aspect, a relief valve for regulating the fuel pressure in the fuel passage to a predetermined pressure is provided in the fuel passage downstream of the fuel pressure regulating valve in the fuel tank. The fuel supply device. According to this configuration, the fuel pressure in the fuel passage can be regulated to a predetermined pressure by the relief valve provided in the fuel passage downstream of the fuel pressure adjusting valve in the fuel tank. Thereby, the abnormal rise of the fuel pressure in the fuel passage downstream of the fuel pressure regulating valve in the fuel tank can be suppressed.

  In an eleventh aspect based on the ninth aspect, the fuel passage between the storage device and the fuel pressure regulating valve is provided with a relief valve for regulating the fuel pressure in the fuel passage to a predetermined pressure. The fuel supply device. According to this configuration, the fuel pressure in the fuel passage can be regulated to a predetermined pressure by the relief valve provided in the fuel passage between the storage device and the fuel pressure regulating valve. Thereby, the abnormal rise of the fuel pressure in the fuel passage between the storage device and the fuel pressure regulating valve can be suppressed.

  A twelfth aspect of the invention is the fuel supply apparatus according to the eleventh aspect of the invention, wherein a check valve for restricting the backflow of the pressurized fuel is provided in the fuel passage between the storage device and the relief valve. . According to this configuration, the backflow of the pressurized fuel can be regulated by the check valve provided in the fuel passage between the storage device and the relief valve. Thereby, the residual pressure of the fuel pressure can be held in the fuel passage between the storage device and the relief valve.

  A thirteenth invention is the fuel supply device according to the twelfth invention, wherein a pressure relief hole is provided in a fuel passage between the storage device and the check valve. According to this configuration, the fuel pressure in the fuel passage can be reduced by the pressure release hole provided in the fuel passage between the storage device and the check valve.

  A fourteenth aspect of the invention is the fuel supply apparatus according to the twelfth aspect of the invention, wherein a pressure release on / off valve is provided in a fuel passage between the storage device and the check valve. According to this configuration, the pressurized fuel can be efficiently stored in the storage device by closing the pressure release on / off valve provided in the fuel passage between the storage device and the check valve. Moreover, the fuel pressure in the fuel passage between the storage device and the check valve can be lowered by opening the pressure release on / off valve.

1 is a configuration diagram illustrating an outline of a fuel supply device according to Embodiment 1. FIG. It is a sectional side view which shows the storage device concerning Embodiment 2. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a sectional side view which decomposes | disassembles and shows a part of storage device. It is a sectional side view which shows the storage device concerning Embodiment 3. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a sectional side view which shows the storage device concerning Embodiment 4. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7. It is a sectional side view which decomposes | disassembles and shows a part of storage device. FIG. 7 is a side sectional view showing a storage device according to a fifth embodiment. It is a XI-XI line sectional view taken on the line of FIG. It is a bottom sectional view showing the storage device concerning Embodiment 6. FIG. 10 is a bottom sectional view showing a storage device according to a seventh embodiment. FIG. 10 is a side sectional view showing a storage device according to an eighth embodiment. It is XV-XV arrow directional cross-sectional view of FIG. FIG. 10 is a side sectional view showing a storage device according to a ninth embodiment. FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 16. It is a sectional side view which shows the storage device concerning Embodiment 10. It is a graph which shows the characteristic of a wave washer. It is a graph which shows the characteristic of a coil spring. FIG. 12 is a schematic plan sectional view showing a wave washer detent structure according to an eleventh embodiment. It is a general | schematic plane sectional view which shows the rotation stopper structure of the wave washer concerning Embodiment 12. It is a general | schematic plane sectional view which shows the rotation stopper structure of the wave washer concerning Embodiment 13. FIG. 16 is a schematic plan sectional view showing a wave washer detent structure according to a fourteenth embodiment. FIG. 18 is a schematic cross-sectional view showing a wave washer detent structure according to a fifteenth embodiment. FIG. 18 is a schematic plan sectional view showing a wave washer detent structure according to Embodiment 16. FIG. 19 is a side cross-sectional view showing a main part of a storage device according to Embodiment 17. FIG. 20 is a side sectional view showing a spring device according to an eighteenth embodiment. It is a top view which shows a spring apparatus. It is a sectional side view which shows the spring apparatus concerning Embodiment 19. It is a top view which shows a spring apparatus. FIG. 21 is a side sectional view showing a storage device according to a twentieth embodiment. FIG. 22 is a side sectional view showing a storage device according to a twenty-first embodiment. FIG. 23 is a side sectional view showing a storage device according to a twenty-second embodiment. It is a sectional side view which shows the operation state of a storage device. FIG. 25 is a side sectional view showing a storage device according to a twenty-third embodiment. FIG. 25 is a side sectional view showing a storage device according to a twenty-fourth embodiment. It is a plane sectional view showing the relation between a mechanism chamber and a coil spring. FIG. 26 is a side sectional view showing a storage device according to a twenty-fifth embodiment. It is a sectional side view which shows the operation state of a storage device. FIG. 27 is a side sectional view showing a storage device according to Embodiment 26. It is bottom sectional drawing which shows the relationship between a mechanism chamber and a coil spring. FIG. 29 is a side sectional view showing a storage device according to Embodiment 27. FIG. 29 is a side sectional view showing a storage device according to Embodiment 28. FIG. 30 is a configuration diagram showing an outline of a fuel supply device according to a twenty-ninth embodiment. It is explanatory drawing which shows the flow of the fuel at the time of accumulation | storage of pressurized fuel. It is explanatory drawing which shows the flow of the fuel at the time of supply of the pressurized fuel by an accumulation | storage device. It is explanatory drawing which shows the flow of the fuel at the time of high load of an engine. FIG. 34 is a cross-sectional view illustrating an outline of a fuel pump device according to a thirtieth embodiment. It is sectional drawing which shows the outline | summary of the fuel pump apparatus concerning Embodiment 31. It is sectional drawing which shows the outline | summary of the fuel pump apparatus concerning Embodiment 32. It is sectional drawing which shows the outline | summary of the fuel pump apparatus concerning Embodiment 33. It is sectional drawing which shows the outline | summary of the fuel pump apparatus concerning Embodiment 34. FIG. FIG. 36 is a side sectional view showing a storage device according to Embodiment 35. It is a block diagram which shows the outline | summary of the fuel supply apparatus concerning Embodiment 36. FIG. 38 is a configuration diagram showing an outline of a fuel supply device according to a thirty-seventh embodiment. FIG. 38 is a configuration diagram showing an outline of a fuel supply device according to a thirty-eighth embodiment. FIG. 42 is a configuration diagram showing an outline of a fuel supply device according to a thirty-ninth embodiment. It is a block diagram which shows the outline | summary of the fuel supply apparatus concerning Embodiment 40. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1] An outline of a fuel supply apparatus will be described. FIG. 1 is a configuration diagram showing an outline of a fuel supply apparatus. As shown in FIG. 1, the fuel supply device 10 includes a fuel pump 12, a pressure regulating valve 14, and a storage device 16. The fuel pump 12, the pressure regulating valve 14, and the storage device 16 are disposed in the fuel tank 18. The fuel pump 12 is an electric fuel pump that sucks, pressurizes, and discharges fuel in the fuel tank 18. The fuel pump 12 supplies pressurized fuel to the fuel injection valve 22 on the engine side through the fuel passage 20. The fuel pump 12 is provided with a fuel filter (not shown) that filters the fuel to be sucked. The fuel injection valve 22 is disposed on the engine side, that is, outside the fuel tank 18. The fuel injection valve 22 injects pressurized fuel into an intake passage or a cylinder of an engine (not shown). The fuel injection valve 22 corresponds to a “fuel injection device” in this specification.

  The pressure regulating valve 14 is disposed in the fuel passage 20 on the downstream side of the storage device 16 in the fuel tank 10. The pressure regulating valve 14 adjusts the fuel pressure of the pressurized fuel and discharges excess pressurized fuel into the fuel tank 18. The storage device 16 is disposed in the fuel passage 20 between the fuel pump 12 and the pressure regulating valve 14. The accumulating device 16 accumulates the pressurized fuel discharged from the fuel pump 12 and supplies the pressurized fuel to the fuel injection valve 22 via the pressure regulating valve 14.

  The storage device 16 includes a cylinder body 24, a piston 26, and a coil spring 28. The cylindrical cylinder body 24 has a cylinder chamber 25. The upper and lower end surfaces of the cylinder chamber 25 are closed. The piston 26 is formed in a disc shape, and is disposed in the cylinder chamber 25 of the cylinder body 24 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 26 divides the inside of the cylinder chamber 25 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 30 and the upper chamber is a back pressure chamber 32. The back pressure chamber 32 is open to the fuel tank 18 or to the atmosphere. The piston 26 corresponds to a “movable partition wall” in this specification.

  A fuel inlet 34 and a fuel outlet 36 that communicate between the inside and outside of the accumulation chamber 30 are formed at one end (the lower end in FIG. 1) of the cylinder body 24. The fuel inflow port 34 and the fuel outflow port 36 are disposed at opposite positions with the cylinder body 24 in between. A fuel passage 20 on the fuel pump 12 side is connected to the fuel inlet 34. A fuel passage 20 on the pressure regulating valve 14 side is connected to the fuel outlet 36.

  The coil spring 28 is interposed between the opposing surfaces of the cylinder body 24 and the piston 26 in the back pressure chamber 32. The coil spring 28 urges the piston 26 in the reduction direction of the accumulation chamber 30, that is, downward. The coil spring 28 corresponds to a “biasing member” in the present specification.

  The fuel pump 12 receives detection signals from, for example, means for detecting the amount of pressurized fuel in the accumulation chamber 30, for example, a full tank detection sensor 38 for detecting full tank, and an empty tank detection sensor 40 for detecting empty tank. Based on this, drive control is performed by a control unit (ECU) 42. In other words, when the fuel pump 12 is operated as the engine (not shown) is driven, the pressurized fuel is supplied to the fuel injection valve 22 and the pressurized fuel is accumulated in the accumulation chamber 30. When full tank is detected by the full tank detection sensor 38, the ECU determines that the storage chamber 30 is almost full, and stops driving the fuel pump 12. Thereby, the pressurized fuel in the accumulation chamber 30 is supplied to the fuel injection valve 22 by the elastic restoring force of the coil spring 28. When empty tank is detected by the empty tank detection sensor 40, the control device 42 determines that the storage chamber 30 is nearly empty and restarts the driving of the fuel pump 12.

  According to the fuel supply device 10, the pressurized fuel discharged from the fuel pump 12 is accumulated in the accumulation chamber 30 of the accumulation device 16, and the pressurized fuel is supplied to the fuel injection valve 22, thereby operating the fuel pump 12. And the current consumption of the fuel pump 12 can be reduced.

  In addition, since the storage device 16 provided in the fuel supply device 10 is disposed in the fuel tank 18, the sealing performance and strength are lower than those of the storage device 16 disposed outside the fuel tank 18. Therefore, the storage device 16 can be reduced in size, weight, and cost. In addition, the downsizing of the storage device 16 can reduce the mounting space required for the storage device 16 and improve the assemblability. Even if a fuel leak occurs in the storage device 16, the fuel does not leak out of the fuel tank 18.

[Embodiment 2] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described, and redundant description will be omitted. 2 is a side sectional view showing the storage device, FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a side sectional view showing a part of the storage device in an exploded manner. As shown in FIG. 2, the storage device (denoted by reference numeral 44) of this embodiment includes a cylinder body 46, a piston 48, and a plurality of coil springs 50 (seven are shown in FIG. 3). The cylinder body 46 has a cylinder chamber 47.

  The cylinder body 46 includes a body member 52 and a cover member 54. The body member 52 includes a bottomed cylindrical resin inner layer member 56 and a bottomed cylindrical metal outer layer member 58 that covers the inner layer member 56. The inner layer member 56 and the outer layer member 58 form an inner and outer double layer shape. The inner layer member 56 forms a side wall portion (peripheral wall portion) and a bottom wall portion of the cylinder chamber 47. A fuel inlet 60 and a fuel outlet 62 communicating with the inside and outside of the cylinder chamber 47 are formed at one end (the lower end in FIG. 2) of the body member 52. The inner layer member 56 corresponds to a “cylinder member” in the present specification.

  The cover member 54 closes the upper surface opening of the cylinder chamber 47 of the body member 52. The cover member 54 includes a cover plate 64 and a number of plugs 66 corresponding to the plurality of coil springs 50. The lid plate 64 is made of metal and has a disk shape. The lid plate 64 has the same number (seven) of circular hole-shaped plug holes 65 as the coil springs 50. One of the seven plug holes 65 is arranged concentrically with the axis of the piston 48, and the remaining six plug holes 65 are evenly arranged on one circumference centered on the axis of the piston 48. ing.

  The plug 66 is made of metal and has a disc-shaped base 67 and a pin-shaped protrusion 68 formed concentrically on the lower surface of the base 67. The base 67 is attached to the plug hole 65 of the cover plate 64 by screwing or the like. The protruding portion 68 is formed in a tapered shape that becomes gradually narrower downward. The cover member 54 and the outer layer member 58 constitute a “frame member” in this specification.

  The piston 48 is made of resin and is formed in a disk shape. The piston 48 is disposed in the cylinder chamber 47 of the cylinder body 46 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 48 divides the inside of the cylinder chamber 47 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 70 and the upper chamber is a back pressure chamber 72. A resin-made piston ring 74 is mounted on the outer periphery of the piston 48. On the upper surface of the piston 48, the same number (seven) of bottomed cylindrical fitting recesses 76 as the coil springs 50 are formed (see FIG. 3). The piston 48 corresponds to a “movable partition wall” in this specification.

  Each coil spring 50 is made of metal, and is interposed in the back pressure chamber 72 between the facing surfaces of the plugs 66 and the pistons 48 of the cylinder body 46. A plurality of coil springs 50 (seven in FIG. 3) are arranged in parallel with respect to one piston 48 (see FIG. 3). That is, one of the seven coil springs 50 is disposed concentrically with the axis of the piston 48, and the remaining six coil springs 50 are evenly distributed on a circumferential line centered on the axis of the piston 48. Has been placed. The coil spring 50 urges the piston 48 in the reduction direction of the accumulation chamber 70, that is, downward. The upper end portion of each coil spring 50 is fitted to the protrusion 68 of each plug 66. The lower end portion of each coil spring 50 is fitted in the fitting recess 76 of the piston 48. The coil spring 50 corresponds to a “biasing member” in this specification.

  A procedure for assembling the components of the storage device 44 will be described. As shown in FIG. 4, after the piston 48 is disposed in the cylinder chamber 47 of the body member 52, the lid plate 64 is disposed on the body member 52, and the lid plate 64 is attached to the outer layer member 58 by welding or the like. In this state, each coil spring 50 is inserted into each plug hole 65 of the cover plate 64, and the lower end portion of each coil spring 50 is fitted into each fitting recess 76 of the piston 48. In this state (the free state of the coil spring 50), the upper part of the coil spring 50 protrudes upward from the cover plate 64. Subsequently, the base portion 67 of each plug 66 is brought into contact with the upper end surface of each coil spring 50, and each coil spring 50 is caused by each plug 66 in a state where the projection 68 is inserted into the upper end portion of each coil spring 50. Are compressed, and the base 67 of each plug 66 is attached to each plug hole 65 of the cover plate 64. In this way, the assembly of the storage device 44 (see FIGS. 2 and 3) is completed.

  According to the storage device 44, a plurality of coil springs 50 that urge the piston 48 in the reduction direction of the storage chamber 70 are arranged in parallel. For this reason, compared with a single coil spring, a spring load can be distributed to each coil spring 50, and the spring constant and weight of each coil spring 50 can be reduced. Thereby, the assembling property of each coil spring 50 can be improved. The number of coil springs 50 may be two or more.

  Further, the plurality of coil springs 50 are evenly arranged on one circumferential line with the axis of the piston 48 as the center, thereby suppressing the offset load on the piston 48 and suppressing the tilt of the piston 48 due to the offset load. Can do. Therefore, the sliding resistance of the piston 48 can be reduced and the operability of the piston 48 can be improved.

  Moreover, compared with a single coil spring, the spring constant of each coil spring 50 can be reduced, and the total length of each coil spring 50 can be shortened. Moreover, L / D (length / diameter ratio) of the coil spring 50 can be increased, and the wire diameter of the coil can be reduced. Further, the contact length is reduced by shortening the overall length of each coil spring 50 and reducing the wire diameter. Therefore, the storage device 44 can be reduced in size and weight.

  Further, by reducing the wire diameter of the coil spring 50, it is possible to suppress a change in the spring constant due to the expansion and contraction of the coil spring 50 accompanying the volume change of the accumulation chamber 70. Moreover, since the contact | adherence length of the coil spring 50 becomes small, the relative deformable amount can be increased.

  Further, the moldability of the cylinder chamber 47 and the slidability of the piston 48 can be ensured by the resin inner layer member 56 of the cylinder body 46. Moreover, the reliability of the cylinder main body 46 can be improved by reinforcing the inner layer member 56 with the cover member 54 and the outer layer member 58 as metal frame members.

[Third Embodiment] Since this embodiment is a modification of the storage device of the first embodiment (see FIG. 1), the changed portion will be described, and a duplicate description will be omitted. FIG. 5 is a side sectional view showing the storage device, and FIG. 6 is a sectional view taken along line VI-VI in FIG. As shown in FIGS. 5 and 6, the storage device of this embodiment (reference numeral 78) includes a cylinder body 80, a piston 82, and a coil spring 84. The cylinder body 80 has a cylinder chamber 81.

  The cylinder body 80 includes a body member 86 and a cover member 88. The body member 86 includes a bottomed cylindrical resin inner layer member 90 and a heavenly cylindrical metal outer layer member 92 that covers the inner layer member 90. The inner layer member 90 forms a side wall portion (peripheral wall portion) and a bottom wall portion of the cylinder chamber 81. The outer layer member 92 closes the upper surface opening of the cylinder chamber 81 of the inner layer member 90. A fuel inlet 96 and a fuel outlet 98 are formed at one end (the lower end in FIG. 5) of the body member 86 so as to communicate the inside and outside of the cylinder chamber 81. A pair of both caulking pieces 93 are formed in a longitudinally symmetrical manner (symmetrical in FIG. 6) at the lower end of the outer layer member 92. The inner layer member 90 corresponds to a “cylinder member” in this specification.

  As shown in FIG. 6, the cover member 88 is made of metal and is formed in a disc shape. The cover member 88 is formed with a pair of attachment holes 89 corresponding to the both caulking pieces 93 of the outer layer member 92. The two caulking pieces 93 are caulked (see the solid line 93 in FIG. 6) in a state where the pair of caulking pieces 93 of the outer layer member 92 are inserted into the mounting holes 89 (see the two-dot chain line 93 in FIG. 6). Thus, the cover member 88 is attached to the body member 86. The cover member 88 is overlapped with the bottom surface of the inner layer member 90. The inner layer member 90 corresponds to a “cylinder member” in this specification. Further, the outer layer member 92 and the cover member 88 constitute a “frame member” in this specification.

  As shown in FIG. 5, the piston 82 is made of resin and is formed in a disk shape. The piston 82 is disposed in the cylinder chamber 81 of the cylinder body 80 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 82 divides the inside of the cylinder chamber 81 into two upper and lower chambers whose volume can be changed. The lower chamber is the accumulation chamber 100 and the upper chamber is the back pressure chamber 102. A resin-made piston ring 104 is attached to the outer periphery of the piston 82. A cylindrical fitting convex portion 106 corresponding to the coil spring 84 is formed on the upper surface of the piston 82. The piston 82 corresponds to a “movable partition wall” in this specification.

  The coil spring 84 is made of metal and is interposed between the facing surfaces of the cover member 88 of the cylinder body 80 and the piston 82 in the back pressure chamber 102. The coil spring 84 urges the piston 82 in the reduction direction of the accumulation chamber 100, that is, downward. The coil spring 84 is disposed concentrically with the cylinder chamber 81 and the piston 82. The lower end portion of the coil spring 84 is fitted to the fitting convex portion 106 of the piston 82. The coil spring 84 corresponds to a “biasing member” in this specification.

  According to the storage device 78, the moldability of the cylinder chamber 81 and the slidability of the piston 82 can be ensured by the resin inner layer member 90 of the cylinder body 80. Moreover, the reliability of the cylinder main body 80 can be improved by reinforcing the inner layer member 90 with the cover member 88 and the outer layer member 92 as metal frame members.

[Embodiment 4] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described, and duplicate description will be omitted. 7 is a side sectional view showing the storage device, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7, and FIG. 9 is a side sectional view showing a part of the storage device in an exploded manner. As shown in FIG. 7, the storage device (denoted by reference numeral 108) of this embodiment includes a cylinder body 110, a piston 112, and a coil spring 114. The cylinder main body 110 has a cylindrical cylinder chamber 111.

  The cylinder body 110 includes a cylinder member 116 and a frame member 118. The cylinder member 116 is made of resin and has an inner cylinder part 120 and an outer cylinder part 122 that form an inner and outer double cylindrical shape, and an annular plate-like bottom plate part that closes a lower end opening surface between the cylinder parts 120 and 122. 124. The cylinder member 116 forms both side wall portions (circumferential wall portions) and a bottom wall portion inside and outside the cylinder chamber 111. A fuel inlet 126 and a fuel outlet 128 that communicate between the inside and outside of the cylinder chamber 111 are formed at one end of the cylinder member 116 (lower end in FIG. 7).

  The frame member 118 includes a column 130 and a pair of upper and lower lid plates 132. The column 130 is made of metal and has a round shaft shape. The support column 130 is inserted into the inner cylinder portion 120 of the cylinder member 116 in a close fitting manner. Both lid plates 132 are made of metal and are formed in a disc shape. A mounting hole 133 is formed at the center of the cover plate 132. The attachment hole 133 of the one (upper) lid plate 132 is attached to the upper end portion of the support column 130 by welding, screwing or the like. The upper lid plate 132 closes the upper end opening of the cylinder chamber 111 of the cylinder member 116. The attachment hole 133 of the other (lower) lid plate 132 is attached to the lower end portion of the column 130 by welding, screwing or the like. The lower lid plate 132 is superimposed on the bottom plate portion 124 of the cylinder member 116.

  The piston 112 is made of resin and is formed in an annular plate shape (see FIG. 8). The piston 112 is disposed in the cylinder chamber 111 of the cylinder body 110 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 112 divides the inside of the cylinder chamber 111 into two upper and lower chambers whose volume can be changed. The lower chamber is the accumulation chamber 135, and the upper chamber is the back pressure chamber 137. Resin-made piston rings 139 and 140 are attached to the inner and outer peripheral portions of the piston 112. An annular fitting recess 141 corresponding to the coil spring 114 is formed on the upper surface of the piston 112. The piston 112 corresponds to a “movable partition wall” in this specification.

  The coil spring 114 is made of metal and is interposed in the back pressure chamber 137 between the opposed surface of the upper cover plate 132 of the cylinder body 110 and the piston 112. The coil spring 114 urges the piston 112 in the reduction direction of the accumulation chamber 135, that is, downward. The coil spring 114 is disposed concentrically with the cylinder chamber 111 and the piston 112. The lower end portion of the coil spring 114 is fitted in the fitting recess 141 of the piston 112. The coil spring 114 corresponds to a “biasing member” in the present specification.

  A procedure for assembling the components of the storage device 108 will be described. As shown in FIG. 9, the piston 112 and the coil spring 114 are disposed in the cylinder chamber 111 of the cylinder member 116. The lower end of the coil spring 114 is fitted into the fitting recess of the piston 112. In this state (the free state of the coil spring 114), the upper end portion of the coil spring 114 protrudes upward from the cylinder member 116. On the other hand, a lower lid plate 132 is attached to the lower end portion of the column 130. The column 130 is inserted into the inner cylinder portion 120 of the cylinder member 116. Subsequently, the coil spring 114 is compressed by the upper cover plate 132, and the cover plate 132 is attached to the upper end portion of the column 130. In this way, the assembly of the storage device 108 (see FIGS. 7 and 8) is completed.

  According to the storage device 108, the moldability of the cylinder chamber 111 and the slidability of the piston 112 can be ensured by the resin cylinder member 116 of the cylinder body 110. Further, by reinforcing the cylinder member 116 with the metal frame member 118, the reliability of the cylinder body 110 can be improved.

[Embodiment 5] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described, and redundant description will be omitted. 10 is a side sectional view showing the storage device, and FIG. 11 is a sectional view taken along line XI-XI in FIG. As shown in FIG. 10, the storage device (denoted by reference numeral 144) of this embodiment includes a cylinder body 146, a piston 148, and two coil springs 151, 152 inside and outside. The cylinder body 146 has a cylinder chamber 147.

  The cylinder main body 146 includes a cylinder member 154 and a cover member 156. The cylinder member 154 is made of a metal such as stainless steel and has a bottomed cylindrical shape. The cylinder member 154 forms a side wall (peripheral wall) and a bottom wall of the cylinder chamber 147. An annular fitting recess 155 is formed on the bottom plate portion 154 a of the cylinder member 154.

  The cover member 156 is made of resin and has a disk shape. The cover member 156 closes the upper end opening of the cylinder chamber 147 of the cylinder member 154. The cover member 156 is formed with an open cylindrical communication recess 158 that communicates with the cylinder chamber 147 of the cylinder member 154.

  The cover member 156 is provided with a fuel inlet 160 and a fuel outlet 162 that communicate between the inside and the outside of the communication recess 158. In the fuel inlet 160, an inlet-side check valve 164 that restricts the backflow of the pressurized fuel is disposed. An outlet check valve 166 that restricts the backflow of pressurized fuel is disposed in the fuel outlet 162.

  The piston 148 is made of resin and has a disk shape. The piston 148 is disposed in the cylinder chamber 147 of the cylinder body 146 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 148 divides the inside of the cylinder chamber 147 into two upper and lower chambers whose volume can be changed. The upper chamber is a storage chamber 168 and the lower chamber is a back pressure chamber 170. A resin-made piston ring 171 is mounted on the outer peripheral portion of the piston 148. Further, the piston 148 is formed with a fitting concave portion 172 having a cylindrical shape. The piston 148 corresponds to a “movable partition wall” in this specification.

  Both the coil springs 151 and 152 are made of metal, and are interposed between opposed surfaces of the cylinder member 154 and the piston 148 in the back pressure chamber 170. Both coil springs 151, 152 urge the piston 148 in the direction of reduction of the accumulation chamber 168, that is, upward. Both coil springs 151 and 152 are arranged in an inner and outer double annular shape. The wire diameter of the coil spring 152 on the outer ring side is set larger than the wire diameter of the coil spring 151 on the inner ring side. For example, the wire diameter of the coil spring 152 on the outer ring side is set to about twice the wire diameter of the coil spring 151 on the inner ring side. The lower ends of the coil springs 151 and 152 are fitted in the fitting recess 155 of the cylinder member 154. The upper ends of the coil springs 151 and 152 are fitted in the fitting recess 172 of the piston 148. A metal washer 173 such as stainless steel is interposed between the coil springs 151 and 152 and the piston 148. The coil springs 151 and 152 correspond to the “biasing member” in this specification.

  The inlet-side check valve 164 is opened by the pressurized fuel flowing into the accumulation chamber 168 and is closed by the backflow of the pressurized fuel from the accumulation chamber 168. The outlet-side check valve 166 is opened by the pressurized fuel flowing out of the accumulation chamber 168 and is closed by the backflow of the pressurized fuel to the accumulation chamber 168.

  According to the storage device 144, a plurality of both coil springs 151, 152 that urge the piston 148 in the reduction direction of the storage chamber 168 are arranged in a double ring shape. For this reason, compared with a single coil spring, a spring load can be distributed to each coil spring 151, 152, and the spring constant and weight of each coil spring 151, 152 can be reduced. Thereby, the assembly property of each coil spring 151,152 can be improved.

  In addition, the uneven load on the piston 148 can be suppressed, and the tilt of the piston 148 due to the uneven load can be suppressed. Therefore, the sliding resistance of the piston 148 can be reduced and the operability of the piston 148 can be improved.

  Further, by disposing the inner ring side coil spring 151 inside the outer ring side coil spring 152, the space utilization factor of the hollow portion of the outer ring side coil spring 152 can be increased.

  Moreover, compared with a single coil spring, the spring constant of each coil spring 151,152 can be reduced, and the full length of each coil spring 151,152 can be shortened. Moreover, L / D (length / diameter ratio) of each of the coil springs 151 and 152 can be increased and the wire diameter of the coil can be reduced. Further, the contact length is reduced by shortening the overall length of each of the coil springs 151 and 152 and reducing the wire diameter. Therefore, the storage device 144 can be reduced in size and weight.

  Further, by reducing the wire diameters of the coil springs 151 and 152, changes in the spring constant due to the expansion and contraction of the coil springs 151 and 152 accompanying the volume change of the accumulation chamber 168 can be suppressed. Moreover, since the contact | adherence length of each coil spring 151,152 becomes small, a relative deformable amount can be increased.

Here, calculation of the specifications of the coil spring of the storage device will be described.
V = A × Δx Equation 1
x2 = xs + xm Equation 2
x1 = x2 + Δx Equation 3
F1 = Δx × k Equation 4
x1 = xL−Δx1 Equation 5
L = x1 + h + t Equation 6
Here, V is the maximum volume of the storage chamber, A is the cross-sectional area of the cylinder chamber, Δx is the stroke of the piston, x2 is the mounting length of the coil spring when the storage chamber is at the maximum volume (referred to as “second mounting length”), x2 Is the contact length of the coil spring, xm is a margin, x1 is the installation length of the coil spring when the accumulation chamber is at the minimum volume (referred to as “first attachment length”), Δx is the stroke of the piston, F1 is when the accumulation chamber is at the minimum volume Load of the coil spring (referred to as “first load”), Δx is the initial deflection amount, k is the spring constant of the coil spring, xL is the free length of the coil spring, Δx1 is the initial deflection amount, L is the total length of the cylinder body, h is The height (thickness) of the piston, t is the total thickness of the upper wall portion and the lower wall portion of the cylinder body.

  When there is one coil spring, F1 = kx1, F2 = kx2, and ΔF = F2-F1. Therefore, the spring constant of the coil spring is high. For this reason, a wire diameter is large and the contact | adherence length becomes large. Further, when the relative strain (Δx / L) is to be reduced in order to suppress the load change amount ΔF, the free length L is increased. Note that F2 is a coil spring load (referred to as “second load”) when the storage chamber has a maximum volume, and ΔF is a load change amount.

When there are two coil springs (A + B), F1 = FA1 + FB1. For this reason, a load is distributed to each coil spring. Also,
FA1 = kAx1
FB1 = kBx1
Because
F1 = (kA + kB) × 1, F2 = (kA + kB) × 2, and ΔF = F2−F1. Therefore, the spring constant of each coil spring is lower than in the case of one coil spring. For this reason, the wire diameter is small and the contact length is small. Further, since the load change ΔF is small, the relative strain (Δx / L) can be increased and the free length L can be decreased. FA1 is the first load of the coil spring (A) when the accumulation chamber is the minimum volume, FB1 is the first load of the coil spring (B) when the accumulation chamber is the minimum volume, and kA is the spring constant of the coil spring (A). , KB is a spring constant of the coil spring (B).

Incidentally, in the case of the same coil spring (A) for both, F1 = FA1 × 2. For this reason, the load per coil spring is halved. Also,
FA1 = kAx1 = kx1 / 2
Thus, the spring constant per coil spring is halved. For this reason, the wire diameter is small and the contact length is small. Further, since the load change ΔF is halved, the relative strain (Δx / L) is doubled and the free length L can be halved.

[Embodiment 6] In this embodiment, since the spring arrangement of the storage device 144 of Embodiment 5 (see FIG. 11) is changed, the changed portion will be described, and the overlapping description will be omitted. FIG. 12 is a bottom sectional view showing the storage device. As shown in FIG. 12, in this embodiment, three coil springs 174, 175, and 176 inside and outside are arranged in a triple ring shape. The number of coil springs may be four or more.

[Embodiment 7] In this embodiment, since the spring arrangement of the storage device of Embodiment 5 (see FIG. 11) is changed, the changed portion will be described, and a duplicate description will be omitted. FIG. 13 is a bottom sectional view showing the storage device. As shown in FIG. 13, in this embodiment, four coil springs 178 are arranged in parallel. The coil springs 178 are equally arranged on a circumferential line centered on the axis of the piston 148. Therefore, the uneven load on the piston 148 can be suppressed, and the inclination of the piston 148 due to the uneven load can be suppressed. Therefore, the sliding resistance of the piston 148 can be reduced and the operability of the piston 148 can be improved. The number of coil springs 178 may be two or more.

[Eighth Embodiment] Since this embodiment is a modification of the storage device of the first embodiment (see FIG. 1), the changed portion will be described, and a duplicate description will be omitted. 14 is a side sectional view showing the storage device, and FIG. 15 is a sectional view taken along line XV-XV in FIG. As shown in FIG. 14, the storage device (indicated by reference numeral 180) of the present embodiment includes a cylinder body 182, a plurality of (showing seven in FIG. 15) pistons 184, and a plurality of (showing seven in FIG. 15). The coil spring 186 is provided. The cylinder main body 182 has a plurality of cylinder chambers 183 (seven are shown in FIG. 15).

  The cylinder main body 182 includes a cylinder member 188, a bottom plate 190, and a plurality of plugs 192 (seven, three are shown in FIG. 14). The cylinder member 188 is made of resin and is formed in a cylindrical shape. A plurality (seven in FIG. 15) of cylinder chambers 183 are arranged in parallel on the cylinder member 188 (see FIG. 15). One of the seven cylinder chambers 183 is arranged concentrically with the axis of the cylinder member 188, and the remaining six cylinder chambers 183 are evenly distributed on a circumferential line centered on the axis of the cylinder member 188. Has been placed. The cylinder member 188 forms a side wall (peripheral wall) and a bottom wall of the cylinder chamber 183.

  At the lower end portion of the cylinder member 188, a dome-shaped cylindrical communication recess 194 is formed. The communication recess 194 and each cylinder chamber 183 communicate with each other through a communication hole 196. The cylinder member 188 is provided with a fuel inlet 198 and a fuel outlet 200 that communicate between the inside and the outside of the communication recess 194. The bottom plate 190 is made of metal or resin and is formed in a disc shape. The bottom plate 190 is attached to the cylinder member 188 so as to close the lower end opening of the communication recess 194.

  Each plug 192 is made of metal and has a disk-like base portion 202 and a pin-like protrusion 203 formed coaxially on the lower surface of the base portion 202. Each plug 192 closes the upper end opening of each cylinder chamber 183 of the cylinder member 188. Specifically, the base 202 of the plug 192 is attached to the upper end opening of the cylinder chamber 183 of the cylinder member 188 by screwing or the like. The protruding portion 203 is formed in a tapered shape that becomes gradually thinner downward.

  Each piston 184 is made of resin and has a disk shape. Each piston 184 is disposed in each cylinder chamber 183 of the cylinder body 182 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 184 divides the inside of the cylinder chamber 183 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 205, and the upper chamber is a back pressure chamber 207. A resin-made piston ring 209 is attached to the outer peripheral portion of each piston 184. Further, a cylindrical fitting convex portion 210 is formed on the upper surface of the piston 184. The piston 184 corresponds to a “movable partition wall” in the present specification.

  Each coil spring 186 is made of metal, and is interposed between the opposing surfaces of the plug 192 of the cylinder body 182 and the piston 184 in the back pressure chamber 207. One of the seven coil springs 186 is disposed concentrically with the axis of the cylinder member 188, and the remaining six coil springs 186 are evenly distributed on a circumferential line centered on the axis of the cylinder member 188. Has been placed. Each coil spring 186 urges the piston 184 in the reduction direction of the accumulation chamber 205, that is, downward. The upper end of each coil spring 186 is fitted to the protrusion 203 of each plug 192. The lower end portion of each coil spring 186 is fitted to the fitting convex portion 210 of each piston 184. The coil spring 186 corresponds to the “biasing member” in this specification.

  According to the storage device 180, a plurality of coil springs 186 are formed together with the piston 184. For this reason, compared with a single coil spring, a spring load can be distributed to each coil spring 186, and the spring constant and weight of each coil spring 186 can be reduced. Thereby, the assembling property of each coil spring 186 can be improved.

  The cylinder body 182 has a plurality of cylinder chambers 183 formed in parallel. For this reason, compared with the case where the cylinder main body 182 has one cylinder chamber 183, the number of the side walls of the cylinder chamber 183 is increased, whereby the axial and radial strength of the cylinder main body 182 can be improved. . In this case, the cylinder member 188 can be made of resin, thereby reducing weight and cost.

  Moreover, compared with a single coil spring, the spring constant of each coil spring 186 can be reduced, and the total length of each coil spring 186 can be shortened. Further, the L / D (length / diameter ratio) of the coil spring 186 can be increased, and the wire diameter of the coil can be reduced. Further, the contact length is reduced by shortening the total length of each coil spring 186 and reducing the wire diameter. Therefore, the storage device 180 can be reduced in size and weight.

  Further, by reducing the wire diameter of the coil spring 186, it is possible to suppress a change in the spring constant due to the expansion and contraction of the coil spring 186 accompanying a change in the volume of the accumulation chamber 205. Moreover, since the contact | adherence length of the coil spring 186 becomes small, the relative deformable amount can be increased.

[Embodiment 9] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), only the changed portion will be described, and duplicate description will be omitted. 16 is a side sectional view showing the storage device, and FIG. 17 is a sectional view taken along line XVII-XVII in FIG. As shown in FIG. 16, the storage device (denoted by reference numeral 212) of the present embodiment includes a cylinder body 214, a plurality (four in FIG. 17), and a plurality of pistons 216 (four in FIG. 17). Coil spring 218. The cylinder body 214 has a plurality (four shown in FIG. 17) of cylinder chambers 215.

  The cylinder main body 214 includes a cylinder member 220 and a frame member 222. The cylinder member 220 is made of resin and has a cylindrical shape. As shown in FIG. 17, the cylinder member 220 is provided with a plurality (four in FIG. 17) of cylinder chambers 215 arranged in parallel (see FIG. 17). The plurality of cylinder chambers 215 are equally arranged on a circumferential line centering on the axis of the cylinder member 220. The cylinder member 220 forms a side wall (peripheral wall) and a bottom wall of the cylinder chamber 215. An annular communication path 224 is formed concentrically at the lower end of the cylinder member 220. The communication path 224 and each cylinder chamber 215 are communicated with each other through a communication hole 226. The cylinder member 220 is provided with a fuel inlet 228 and a fuel outlet 230 that communicate between the inside and outside of the communication passage 224. A through hole 231 penetrating in the axial direction (vertical direction) is formed at the center of the cylinder member 220.

  The frame member 222 includes a support column 232 and upper and lower cover plates 234 and 236. The support column 232 is made of metal and has a round shaft shape. The support column 232 is inserted into the through hole 231 of the cylinder member 220 in a close fitting manner. Both lid plates 234, 236 are made of metal and are formed in a disc shape. A mounting hole 238 is formed at the center of the upper cover plate 234. The attachment hole 238 of the upper cover plate 234 is attached to the upper end portion of the support column 232 by welding, screwing or the like. The upper cover plate 234 closes the upper end openings of the plurality of cylinder chambers 215 of the cylinder member 188. The same number of pin-shaped protrusions 239 as the pistons 216 protrude from the lower surface of the upper cover plate 234. The projecting portion 239 is formed in a tapered shape that becomes gradually thinner downward. A mounting hole 241 is formed in the lower cover plate 236. The attachment hole 241 of the lower cover plate 236 is attached to the lower end portion of the column 232 by welding, screwing or the like. The lower lid plate 236 is overlaid on the bottom plate portion (reference numeral 221) of the cylinder member 220.

  Each piston 216 is made of resin and has a disk shape. Each piston 216 is disposed in each cylinder chamber 215 of the cylinder body 214 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). Each piston 216 divides the inside of the cylinder chamber 215 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 243 and the upper chamber is a back pressure chamber 245. A resin-made piston ring 247 is attached to the outer peripheral portion of each piston 216. An annular fitting convex portion 249 is formed on the upper surface of each piston 216. Each piston 216 corresponds to a “movable partition wall” in this specification.

  Each coil spring 218 is made of metal, and is interposed in the back pressure chamber 245 between the upper cover plate of the cylinder body 214 and the opposed surface of each piston 216. The coil springs 218 are evenly arranged on a circumferential line centered on the axis of the cylinder member 220. Each coil spring 218 urges each piston 216 in the contracting direction of the accumulation chamber 243, that is, downward. The lower end portion of each coil spring 218 is fitted to the fitting convex portion 249 of each piston 216. The coil spring 218 corresponds to a “biasing member” in this specification.

  According to the storage device 212, a plurality of coil springs 218 are formed together with the piston 216. For this reason, compared with the single coil spring 218, a spring load can be disperse | distributed to each coil spring 218, and the spring constant and weight of each coil spring 218 can be reduced. Thereby, the assembling property of each coil spring 218 can be improved.

  The cylinder body 214 has a plurality of cylinder chambers 215 formed in parallel. For this reason, compared with the case where the cylinder main body 214 has one cylinder chamber 215, the number of the side walls of the cylinder chamber 215 increases, whereby the strength in the axial direction and the radial direction of the cylinder main body 214 can be improved. . In this case, it is possible to reduce the weight and cost by making the cylinder member 220 made of resin.

  Moreover, compared with the single coil spring 218, the spring constant of each coil spring 218 can be reduced and the total length of each coil spring 218 can be shortened. Further, L / D (length / diameter ratio) of the coil spring 218 can be increased, and the coil wire diameter can be reduced. Further, the contact length is reduced by shortening the overall length of each coil spring 218 and reducing the wire diameter. Therefore, the storage device 212 can be reduced in size and weight.

  Further, by reducing the wire diameter of the coil spring 218, it is possible to suppress a change in the spring constant due to the expansion and contraction of the coil spring 218 accompanying the volume change of the accumulation chamber 243. Further, since the contact length of the coil spring 218 is reduced, the relative deformable amount can be increased.

  Further, the moldability of the cylinder chamber 215 and the slidability of the piston 216 can be ensured by the resin cylinder member 220 of the cylinder body 214. In addition, by reinforcing the cylinder member 220 with the metal frame member 222, the reliability of the cylinder body 214 can be improved.

[Embodiment 10] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described, and the duplicate description will be omitted. FIG. 18 is a side sectional view showing the storage device. As shown in FIG. 18, the storage device (denoted by reference numeral 251) of this embodiment includes a cylinder main body 253, pistons 255, and a plurality of (showing eight in FIG. 18) wave washers 257. The cylinder body 253 has a cylinder chamber 254.

  The cylinder main body 253 includes a cylinder member 259 and a cover member 261. The cylinder member 259 is made of a metal such as stainless steel and has a bottomed cylindrical shape. The cylinder member 259 forms a side wall portion (peripheral wall portion) and a bottom wall portion of the cylinder chamber 254.

  The cover member 261 is made of resin and is formed in a disk shape. The cover member 261 closes the upper end opening of the cylinder chamber 254 of the cylinder member 259. The cover member 261 is formed with an open cylindrical communication recess 263 that communicates with the cylinder chamber 254 of the cylinder member 259.

  The cover member 261 is provided with a fuel inlet 265 and a fuel outlet 267 that communicate between the inside and the outside of the communication recess 263. In the fuel inlet 265, an inlet-side check valve 269 that restricts the backflow of the pressurized fuel is disposed. An outlet check valve 271 that restricts the backflow of pressurized fuel is disposed in the fuel outlet 267.

  The piston 255 is made of resin and is formed in a disk shape. The piston 255 is disposed in the cylinder chamber 254 of the cylinder body 253 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 255 divides the inside of the cylinder chamber 254 into two upper and lower chambers whose volume can be changed. The upper chamber is a storage chamber 273 and the lower chamber is a back pressure chamber 275. A resin piston ring 277 is attached to the outer periphery of the piston 255. Also, the piston 255 is formed with a dented cylindrical fitting recess 279. The piston 255 corresponds to a “movable partition wall” in this specification.

  The plurality of wave washers 257 are made of metal, and are interposed between opposing surfaces of the cylinder member 259 and the piston 255 in the back pressure chamber 275. The plurality of wave washers 257 are arranged in series in the axial direction (vertical direction). The plurality of wave washers 257 urge the piston 255 in the reduction direction of the accumulation chamber 273, that is, upward. Among the plurality of wave washers 257, a plurality of (for example, 3 to 4) wave washers 257 on the upper end side are fitted in the fitting recesses 279 of the cylinder member 259. The wave washer 257 corresponds to the “biasing member” in this specification. Further, a rotation prevention structure (not shown) is provided between the cylinder member 259 and the wave washer 257 so as to prevent the wave washer 257 from rotating in the circumferential direction so that the peak portions of the wave washer 257 adjacent in the vertical direction are in contact with each other. ) Should be provided. Moreover, it is good to couple the peak parts of the adjacent wave washer 257 by welding or the like.

  The inlet-side check valve 269 is opened by the pressurized fuel flowing into the accumulation chamber 273 and is closed by the backflow of the pressurized fuel from the accumulation chamber 273. Further, the outlet side check valve 271 is opened by the pressurized fuel flowing out from the accumulation chamber 273 and is closed by the backflow of the pressurized fuel to the accumulation chamber 273.

  According to the storage device 251, a plurality of wave washers 257 that urge the piston 255 in the reduction direction of the storage chamber 273 are arranged in series. For this reason, compared with a single wave washer, the spring load can be distributed to each wave washer 257, and the spring constant and weight of each wave washer 257 can be reduced. Thereby, the assembly property of each wave washer 257 can be improved.

  In addition, the coil spring has a linear or substantially linear characteristic (see FIG. 20), whereas the wave washer 257 has a non-linear characteristic (see FIG. 21). For this reason, the wave washer 257 exhibits a characteristic close to a constant load in a part of the displacement amount of the piston 255, and therefore a constant range indicating a characteristic close to the constant load is defined as a constant load region R (see FIG. 19). By using the vicinity, the amount of change in the pressure in the accumulation chamber 273, that is, the change in the fuel pressure can be made constant.

  Further, the wave washer 257 can reduce the volume of the back pressure chamber 275 while securing the volume of the accumulation chamber 273 as compared with the coil spring. Further, the wave washer 257 can reduce the spring constant and secure the displacement amount of the piston 255 while suppressing an increase in the spring load. Further, by reducing the free length of the wave washer 257, the overall length of the cylinder body 253 can be reduced and the weight can be reduced. Therefore, the storage device 251 can be reduced in size.

  Further, by suppressing the maximum spring load and suppressing the maximum fuel pressure, the operating load of the fuel pump can be reduced, and the power consumption of the fuel pump can be reduced. In addition, the wave washer 257 can suppress the uneven load because a stable deflection in which both upper and lower end surfaces are displaced in parallel is obtained. Thereby, the inclination of the piston 255 can be suppressed. Therefore, the sliding resistance of the piston can be reduced and the operability of the piston can be improved.

  A plurality of sets of wave washers 257 may be arranged in parallel as in the case of the coil spring 50 of the second embodiment (see FIG. 3). Further, a plurality of wave washers 257 may be set as one set, and a plurality of sets may be arranged in a multiple ring shape in the same manner as the coil springs 151 and 152 of the fifth embodiment (see FIG. 11).

[Embodiment 11] This embodiment exemplifies a wave washer detent structure in the storage device of Embodiment 10 (see FIG. 18). FIG. 21 is a schematic cross-sectional view showing a structure for preventing rotation of a wave washer. As shown in FIG. 21, in this embodiment, the wave washer (reference numeral 281) is formed in a triangular ring shape in plan view. On the other hand, the cylinder member 259 (see FIG. 18) is provided with a triangular pillar-shaped guide column 283. The wave washer 281 is positioned in the circumferential direction by being fitted to the guide column 283.

[Embodiment 12] This embodiment exemplifies the structure for preventing the wave washer from rotating in the storage device of Embodiment 10 (see FIG. 18). FIG. 22 is a schematic cross-sectional view showing a wave washer detent structure. As shown in FIG. 22, in this embodiment, the wave washer (reference numeral 285) is formed in a quadrangular ring shape in plan view. On the other hand, the cylinder member 259 (see FIG. 18) is provided with a quadrangular columnar guide column 287. The wave washer 285 is positioned in the circumferential direction by being fitted to the guide column 287.

[Embodiment 13] This embodiment exemplifies the anti-rotation structure of the wave washer in the storage device of Embodiment 10 (see FIG. 18). FIG. 23 is a schematic cross-sectional view showing a structure for preventing rotation of a wave washer. As shown in FIG. 23, in this embodiment, a wave washer (reference numeral 289) is formed in a pentagonal ring shape in plan view. On the other hand, a pentagonal columnar guide column 291 is provided on the cylinder member 259 (see FIG. 18). The wave washer 289 is positioned in the circumferential direction by being fitted to the guide column 291.

[Embodiment 14] This embodiment exemplifies the anti-rotation structure of the wave washer in the storage device of Embodiment 10 (see FIG. 18). FIG. 24 is a schematic plan cross-sectional view showing a structure for preventing rotation of a wave washer. As shown in FIG. 24, in this embodiment, the wave washer (reference numeral 293) is formed in a hexagonal ring shape in plan view. On the other hand, a hexagonal columnar guide column 295 is provided on the cylinder member 259 (see FIG. 18). The wave washer 293 is positioned in the circumferential direction by being fitted to the guide column 295.

[Embodiment 15] This embodiment exemplifies the anti-rotation structure of the wave washer in the storage device of Embodiment 10 (see FIG. 18). FIG. 25 is a schematic cross-sectional view showing a structure for preventing rotation of a wave washer. As shown in FIG. 25, in this embodiment, the wave washer (reference numeral 297) is formed in an annular shape in plan view. A positioning protrusion 298 protrudes from the inner peripheral portion of the wave washer 297. On the other hand, a guide column 300 is provided on the cylinder member 259 (see FIG. 18). The guide column 300 is formed in a cylindrical shape. A positioning groove 301 is formed on the outer peripheral surface of the guide column 300. The positioning groove 301 extends in the axial direction of the guide column 300 (the front and back direction in FIG. 25). The wave washer 297 is positioned in the circumferential direction when the positioning groove 301 and the positioning protrusion 298 are engaged when fitted to the guide column 300. A plurality of positioning protrusions 298 and positioning grooves 301 may be provided.

[Embodiment 16] This embodiment exemplifies the anti-rotation structure of the wave washer in the storage device of Embodiment 10 (see FIG. 18). FIG. 26 is a schematic cross-sectional view showing a structure for preventing rotation of a wave washer. As shown in FIG. 26, in this embodiment, the wave washer (reference numeral 303) is formed in an annular shape in plan view. A positioning groove 304 is formed in the inner peripheral portion of the wave washer 303. On the other hand, a guide column 306 is provided on the cylinder member 259 (see FIG. 18). The guide column 306 is formed in a cylindrical shape. A positioning protrusion 307 is formed on the outer peripheral surface of the guide column 306. The positioning protrusion 307 extends in the axial direction of the guide column 306 (the front and back direction in FIG. 26). When the wave washer 303 is fitted to the guide column 306, the wave washer 303 is positioned in the circumferential direction by engaging the positioning protrusion 307 and the positioning groove 304. A plurality of positioning grooves 304 and positioning protrusions 307 may be provided.

[Embodiment 17] Since this embodiment is a modification of Embodiment 10 (see FIG. 18), the changed portion will be described, and duplicate description will be omitted. FIG. 27 is a side sectional view showing the main part of the storage device. As shown in FIG. 27, in the present embodiment, a flat metal load transmission plate 309 is interposed between adjacent wave washers 257 in the tenth embodiment (see FIG. 18). Therefore, the load can be evenly transmitted to the piston 255 via the load transmission plate 309 between the adjacent wave washers 257.

[Eighteenth Embodiment] Since this embodiment is a modification of the tenth embodiment (see FIG. 18), the changed portion will be described, and a duplicate description will be omitted. FIG. 28 is a side sectional view showing the spring device, and FIG. 29 is a plan view of the same. As shown in FIGS. 28 and 29, in the present embodiment, the three peak portions of the adjacent wave washers 257 in the tenth embodiment (see FIG. 18) are coupled by coupling means such as welding. Reference numeral 312 is attached to the coupling portion. Thereby, all the wave washers 257 are integrated as one spring device 311. Accordingly, the adjacent wave washers 257 can be positioned in the circumferential direction.

[Embodiment 19] Since this embodiment is a modification of Embodiment 10 (see FIG. 18), the changed portion will be described, and duplicate description will be omitted. 30 is a side sectional view showing the spring device 311 and FIG. 31 is a plan view of the same. As shown in FIGS. 30 and 31, in this embodiment, one of the three ridges of the adjacent wave washer 257 in the tenth embodiment (see FIG. 18) is a joining means such as welding. Are combined. Reference numerals 314 are assigned to the coupling portions. Thereby, all the wave washers 257 are integrated as one spring device 313. Accordingly, the adjacent wave washers 257 can be positioned in the circumferential direction. Note that the coupling unit 314 may be arranged by shifting the phase in the circumferential direction in stages.

[Embodiment 20] Since this embodiment is a modification of Embodiment 10 (see FIG. 18), the changed portion will be described and redundant description will be omitted. FIG. 32 is a side sectional view showing the storage device. As shown in FIG. 32, the storage device (denoted by reference numeral 315) of the present embodiment is obtained by changing the plurality of wave washers 257 in the tenth embodiment (see FIG. 18) to one coiled wave spring 317. It is. The coiled wave spring 317 is a spring obtained by coiling a flat wire while continuously forming a wave shape. The coiled wave spring 317 corresponds to the “biasing member” in this specification.

[Embodiment 21] Since this embodiment is a modification of Embodiment 20 (see FIG. 32), the changed portion will be described, and a duplicate description will be omitted. FIG. 33 is a side sectional view showing the storage device. As shown in FIG. 33, the storage device (indicated by reference numeral 319) of this embodiment is replaced with a plurality (two in FIG. 32) instead of one coiled wave spring 317 in the twentieth embodiment (see FIG. 32). The coiled wave springs 321 are arranged in series. The coiled wave spring 321 corresponds to the “biasing member” in this specification.

[Twenty-second Embodiment] Since this embodiment is a modification of the storage device of the first embodiment (see FIG. 1), the changed portion will be described, and a duplicate description will be omitted. FIG. 34 is a side sectional view showing the storage device, and FIG. 35 is a side sectional view showing the operating state. As shown in FIG. 34, the storage device (denoted by reference numeral 323) of this embodiment includes a cylinder body 325, a pair of pistons 327, and a coil spring 329. The cylinder body 325 has a cylinder chamber 326.

  The cylinder main body 325 includes a cylinder member 331 and a frame member 333. The cylinder member 331 is formed in a rectangular box shape. The cylinder member 331 forms a cylinder chamber 326 extending in the left-right direction. The frame member 333 is formed in a hollow box shape. A cylinder member 331 is accommodated in the frame member 333. A mechanism chamber 335 is formed between the upper wall portion 331a of the cylinder member 331 and the upper wall portion 333a of the frame member 333. Although not shown, the cylinder body is formed with a fuel inlet and a fuel outlet that communicate with the inside and outside of the cylinder chamber.

  Both pistons 327 are disposed in the cylinder chamber 326 of the cylinder member 331 so as to be movable in the axial direction (left and right in FIG. 34), that is, displaceable. Both pistons 327 divide the inside of the cylinder chamber 326 into three chambers whose volume can be changed. The middle chamber is a storage chamber 337, and the left and right chambers are back pressure chambers 339. Both pistons 327 correspond to the “movable partition wall” in this specification.

  The coil spring 329 is disposed so as to be extendable in the vertical direction with respect to the mechanism chamber 335 of the cylinder body 325. The coil spring 329 biases both pistons 327 in the direction of reduction of the accumulation chamber 337 via the booster mechanism 341. The coil spring 329 corresponds to a “biasing member” in the present specification.

  The booster mechanism 341 is interposed between the coil spring 329 and both pistons 327, and boosts the urging force of the coil spring 329 and transmits it to the piston 327. The booster mechanism 341 includes a cam member 343, a pair of left and right link members 345, and a pair of left and right lever members 347. The cam member 343 is formed in a disk shape having a predetermined plate thickness. The left and right side surfaces of the cam member 343 are formed as tapered inclined surfaces that gradually decrease the outer diameter downward. The cam member 343 is disposed so as to be movable up and down in a state where the upper surface is in contact with the lower end surface of the coil spring 329.

  Both link members 345 and both lever members 347 are arranged symmetrically. Both link members 345 are formed in a lateral V-shape. One end portions (lower end portions) of both link members 345 are rotatably connected to the upper wall portion 331a of the cylinder member 331 via a first rotation shaft 349. The other end portions (upper end portions) of both the link members 345 are in contact with the tapered side surfaces of the cam member 343 so as to be relatively slidable in the vertical direction.

  Both lever members 347 are formed in a lateral V-shape. The upper portion of the lever portion extending downward of both lever members 347 is rotatably connected to the upper wall portion 331a of the cylinder member 331 via the second rotation shaft 351. One end portions (lower end portions) of both lever members 347 are connected to the piston 327 via the first connecting portion 353 so as to be rotatable and vertically movable. The other end portions (upper end portions) of both lever members 347 are connected to the link member 345 via the second connecting portion 355 so as to be rotatable and movable in the vertical direction. The cylinder member 331 has an opening (not shown) that allows the operation of both lever members 347.

  In the booster mechanism 341 (see FIG. 34), when the pressurized fuel is supplied to the accumulation chamber 337, both the lever members 347 move around the second rotation shaft 351 as both pistons 327 are pushed in the opposite directions. It is rotated. Thus, as both link members 345 are rotated about the first rotation shaft 349, the cam member 343 is pushed up against the biasing force of the coil spring 329 (see FIG. 35).

  When the supply of pressurized fuel is stopped, both link members 345 are rotated around the first rotation shaft 349 as the cam member 343 is pushed down by the biasing force of the coil spring 329. Accordingly, as both lever members 347 are rotated around the second rotation shaft 351, both pistons 327 are pushed in the proximity direction (see FIG. 34). As a result, the pressurized fuel in the accumulation chamber 337 is discharged (discharged).

  The accumulating device 323 includes a booster mechanism 341 that boosts and transmits the urging force of the coil spring 329 that urges the piston 327 in the contracting direction of the accumulating chamber 337 to the piston 327. Therefore, the spring load of the coil spring 329 can be reduced. Thereby, since the length and outer diameter of the coil spring 329 can be suppressed, the storage device 323 can be reduced in size. In addition, since the piston 327 and the coil spring 329 can be arranged in a shape other than the concentric shape, the degree of freedom in layout of the piston 327 and the coil spring 329 can be increased.

[Embodiment 23] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described and redundant description will be omitted. FIG. 36 is a side sectional view showing the storage device. As shown in FIG. 36, the storage device (denoted by reference numeral 357) of this embodiment includes a cylinder body 359, a piston 361, and a coil spring 363. The cylinder body 359 has a cylinder chamber 360.

  The cylinder main body 359 includes a cylinder member 365 and a frame member 367. The cylinder member 365 is formed in a hollow box shape. The cylinder member 365 forms a cylinder chamber 360 extending in the vertical direction. The frame member 367 is formed in a hollow box shape. A cylinder member 365 is accommodated in the frame member 367. A fuel inflow port 369 and a fuel outflow port 371 that communicate with the inside and outside of the cylinder chamber 360 are formed in the cylinder body 359. A mechanism chamber 373 is formed on one side (right side) of the frame member 367.

  The piston 361 is disposed in the cylinder chamber 360 of the cylinder body 359 so as to be movable in a predetermined range in the axial direction (vertical direction), that is, displaceable. The piston 361 divides the inside of the cylinder chamber 360 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 375 and the upper chamber is a back pressure chamber 377. A piston ring 379 is attached to the outer periphery of the piston 361. The piston 361 corresponds to a “movable partition wall” in the present specification.

  The coil spring 363 is disposed so as to be extendable in the vertical direction with respect to the mechanism chamber 373 of the frame member 367. The coil spring 363 urges the piston 361 in the contracting direction of the accumulation chamber 375, that is, downward, via the booster mechanism 381. The coil spring 363 corresponds to the “biasing member” in this specification.

  The booster mechanism 381 is interposed between the coil spring 363 and the piston 361 and boosts the urging force of the coil spring 363 and transmits it to the piston 361. The booster mechanism 381 includes a lever member 383 and a spring receiving member 385. The lever member 383 is formed in a straight bar shape. One end portion (left end portion) of the lever member 383 is connected to the piston 361 via a connecting portion 387 so as to be rotatable and movable in the left-right direction. The spring receiving member 385 is disposed so that the coil spring 363 can be pushed down. The other end portion (right end portion) of the lever member 383 is connected to the spring receiving member 385 via a connecting portion 389 so as to be rotatable and movable in the left-right direction. A portion on the right side of the center of the lever member 383 is rotatably connected to the left side wall 373a of the mechanism chamber 373 via a rotation shaft 391. The cylinder body 359 is formed with an opening that allows the lever member 383 to operate.

  In the booster mechanism 381, when the pressurized fuel is supplied from the fuel inlet 369 to the accumulation chamber 375, the lever member 383 is rotated about the rotation shaft 391 as the piston 361 is pushed up. As a result, the spring receiving member 385 is pushed down against the biasing force of the coil spring 363.

  When the supply of the pressurized fuel is stopped, the lever member 383 is rotated around the rotation shaft 391 as the spring receiving member 385 is pushed up by the biasing force of the coil spring 363. As a result, the piston 361 is pushed down, and the pressurized fuel in the accumulation chamber 375 is discharged (discharged) from the fuel outlet 371.

  The accumulator 357 includes a booster mechanism 381 that boosts and transmits the urging force of the coil spring 363 that urges the piston 361 in the contracting direction of the accumulating chamber 375 to the piston 361. Therefore, the spring load of the coil spring 363 can be reduced. Further, since the length and outer diameter of the coil spring 363 can be suppressed, the storage device 357 can be reduced in size. Further, the piston 361 and the coil spring 363 can be arranged at positions where the mutual axis lines are shifted. For this reason, the freedom degree of the layout of the piston 361 and the coil spring 363 can be increased.

[Embodiment 24] Since this embodiment is a modification of the storage device of Embodiment 23 (see FIG. 36), the changed portion will be described, and redundant description will be omitted. FIG. 37 is a side sectional view showing the storage device, and FIG. 38 is a plan sectional view showing the relationship between the mechanism chamber and the coil spring. As shown in FIG. 37, in the storage device of the present embodiment (denoted by reference numeral 393), the frame member (denoted by reference numeral 395) of the cylinder body 359 has a mechanism chamber (denoted by reference numeral 397) is a cylinder member. It is formed in an annular shape so as to surround 365. Further, the coil spring (reference numeral 399) is disposed concentrically with the mechanism chamber 397 of the frame member 395 and can be expanded and contracted in the vertical direction (see FIG. 38). The coil spring 399 corresponds to the “biasing member” in this specification.

  A plurality of booster mechanisms 381 are arranged at equal intervals in the circumferential direction of the mechanism chamber 397. The plurality of booster mechanisms 381 operate synchronously. In the booster mechanism 381, the connecting portion 387 and the connecting portion 389 of the twenty-third embodiment (see FIG. 36) are changed. That is, the first link member 401 is interposed between the lever member 383 and the piston 361. An upper end portion of the first link member 401 is rotatably connected to the lever member 383 via the first rotation shaft 402. A lower end portion of the first link member 401 is rotatably connected to the piston 361 via a second rotation shaft 403.

  A second link member 404 is interposed between the lever member 383 and the spring receiving member 385. An upper end portion of the second link member 404 is rotatably connected to the lever member 383 via a third rotation shaft 405. A lower end portion of the second link member 404 is rotatably connected to the spring receiving member 385 via a fourth rotation shaft 406. In FIG. 37, the booster mechanism 381 in the non-actuated state is indicated by a solid line, and the booster mechanism 381 in the actuated state is indicated by a two-dot chain line. The cylinder body 359 including the frame member 395 has an opening that allows the lever member 383 to operate.

[Embodiment 25] Since this embodiment is a modification of the storage device of Embodiment 1 (see FIG. 1), the changed portion will be described, and duplicate description will be omitted. 39 is a side sectional view showing the storage device, and FIG. 40 is a side sectional view showing the operating state. As shown in FIG. 39, the storage device (denoted by reference numeral 407) of this embodiment includes a cylinder body 409, a piston 411, and a coil spring 413. The cylinder body 409 has a cylinder chamber 410.

  The cylinder main body 409 includes a cylinder member 415 and a frame member 417. The cylinder member 415 is formed in a hollow box shape. The cylinder member 415 forms a cylinder chamber 410 extending in the vertical direction. The frame member 417 is formed in a hollow box shape. A cylinder member 415 is accommodated in the frame member 417. The cylinder body 409 is formed with a fuel inlet 419 and a fuel outlet 421 that communicate with the inside and outside of the cylinder chamber 410. A mechanism chamber 423 is formed on one side (right side) of the frame member 417.

  The piston 411 is disposed in the cylinder chamber 410 of the cylinder body 409 so as to be movable in a predetermined range in the axial direction (vertical direction), that is, displaceable. The piston 411 partitions the inside of the cylinder chamber 410 into two upper and lower chambers whose volume can be changed. The lower chamber is a storage chamber 425 and the upper chamber is a back pressure chamber 427. A piston ring 429 is attached to the outer periphery of the piston 411. The piston 411 corresponds to a “movable partition wall” in this specification.

  The coil spring 413 is disposed so as to be extendable in the vertical direction with respect to the mechanism chamber 423 of the frame member 417. The coil spring 413 urges the piston 411 in the reduction direction of the accumulation chamber 425 via the booster mechanism 431. The coil spring 413 corresponds to a “biasing member” in the present specification.

  The booster mechanism 431 is interposed between the coil spring 413 and the piston 411, and boosts the urging force of the coil spring 413 and transmits it to the piston 411. The booster mechanism 431 includes a lever member 433, a first link member 435, a second link member 437, and a spring receiving member 439. The lever member 433 is formed in a straight bar shape. One end portion (left end portion) of the lever member 433 is rotatably connected to a portion on the left side of the center of the ceiling portion of the cylinder member 415 via a first rotation shaft 441.

  A first link member 435 is interposed between the lever member 433 and the piston 411. The upper end portion of the first link member 435 is rotatably connected to the center left portion of the lever member 433 via a second rotation shaft 442. A lower end portion of the first link member 435 is rotatably connected to the piston 411 via a third rotation shaft 443.

  The second link member 437 is formed in an L shape. The second link member 437 is disposed in the mechanism chamber 423. The upper end portion of the second link member 437 is connected to the other end portion (right end portion) of the lever member 433 via the first connecting portion 444 so as to be rotatable and movable in the left-right direction.

  The spring receiving member 439 is arranged so that the coil spring 413 can be pushed up. The spring receiving member 439 is attached to the other end portion (lower end portion) of the second link member 437 via an attachment portion 446. The cylinder body 409 has an opening that allows the lever member 433 to operate.

  In the booster mechanism 431 (see FIG. 39), when pressurized fuel is supplied from the fuel inlet 419 to the accumulation chamber 425, the lever member 433 is interposed via the first link member 435 as the piston 411 is pushed up. Is rotated around the first rotation shaft 441. Thereby, the spring receiving member 439 is pushed up against the biasing force of the coil spring 413 together with the second link member 437 (see FIG. 40).

  When the supply of the pressurized fuel is stopped, the lever member 433 is rotated around the first rotation shaft 441 as the second link member 437 is pushed down together with the spring receiving member 439 by the biasing force of the coil spring 413. The Thereby, piston 411 is pushed down via the 1st link member 435 (refer to Drawing 39). As a result, the pressurized fuel in the accumulation chamber 425 is discharged (discharged) from the fuel outlet 421.

  The accumulating device 407 includes a booster mechanism 431 that boosts and transmits the urging force of the coil spring 413 that urges the piston 411 in the reduction direction of the accumulating chamber 425 to the piston 411. Therefore, the spring load of the coil spring 413 can be reduced. In addition, since the length and outer diameter of the coil spring 413 can be suppressed, the storage device 407 can be downsized. Further, the piston 411 and the coil spring 413 can be arranged at positions where their mutual axes are shifted. For this reason, the freedom degree of the layout of the piston 411 and the coil spring 413 can be increased.

[Twenty-sixth Embodiment] Since this embodiment is a modification of the storage device of the twenty-fifth embodiment (see FIGS. 39 and 40), the changed portion will be described and redundant description will be omitted. 41 is a side sectional view showing the storage device, and FIG. 42 is a bottom sectional view showing the relationship between the mechanism chamber and the coil spring. As shown in FIG. 41, in the storage device of this embodiment (denoted by reference numeral 448), the frame member (denoted by reference numeral 450) of the cylinder body 409 has a mechanism chamber (denoted by reference numeral 452) is a cylinder member. It is formed in an annular shape so as to surround 415. Further, the coil spring (reference numeral 454) is disposed concentrically with respect to the mechanism chamber 452 of the frame member 450 and is extendable in the vertical direction (see FIG. 42). The coil spring 454 corresponds to the “biasing member” in this specification.

  A plurality of booster mechanisms 431 are arranged at equal intervals in the circumferential direction of the mechanism chamber 452. The plurality of booster mechanisms 431 operate synchronously. In FIG. 41, the booster mechanism 431 in the non-actuated state is indicated by a solid line, and the booster mechanism 431 in the actuated state is indicated by a two-dot chain line. The cylinder body 359 including the frame member 450 is formed with an opening that allows the lever member 383 to operate.

[Twenty-seventh Embodiment] This embodiment is a modification of the storage device of the twenty-sixth embodiment (see FIG. 41). Therefore, the changed portion will be described, and a duplicate description will be omitted. FIG. 43 is a side sectional view showing the storage device. As shown in FIG. 43, in the storage device according to the present embodiment (denoted by reference numeral 456), an arm portion (denoted by reference numeral 458) between the second rotating shaft 442 and the first connecting portion 444 in the lever member 433 is provided. ) Is bent in a gentle inverted V shape so as to protrude upward from the cylinder body 409. Accordingly, the first connecting portion 444 is disposed above the frame member 450. The cylinder body 409 including the frame member 450 is formed with an opening that allows the lever member 433 and the second link member 437 to operate.

[Twenty-eighth Embodiment] Since this embodiment is a modification of the storage device of the twenty-sixth embodiment (see FIG. 41), the changed portion will be described, and a duplicate description will be omitted. FIG. 44 is a side sectional view showing the storage device. As shown in FIG. 44, in the storage device of this embodiment (reference numeral 460 is attached), the lever member 433 is disposed on the upper side of the cylinder body 409. Accordingly, the first rotation shaft 441 is disposed on the frame member 450 and the first connecting portion 444 is disposed above the frame member 450.

  The first link member 435, the second rotation shaft 442, and the third rotation shaft 443 of Embodiment 26 (see FIG. 41) are omitted. Instead, a projecting shaft 462 that projects upward is formed concentrically on the piston 411. The upper end portion of the protruding shaft 462 extends upward through a shaft insertion hole 464 that penetrates the upper wall portion of the cylinder body 409 (the upper wall portions of the cylinder member 415 and the frame member 450). A seal member 466 that elastically seals between the upper wall portion of the cylinder body 409 and the protruding shaft 462 is attached to the shaft insertion hole 464.

  The upper end portion of the protruding shaft 462 is connected to the lever member 433 via the second connecting portion 468 so as to be rotatable and movable in the left-right direction. Here, the shaft hole 470 of the lever member 433 is rotatably connected to the protruding shaft 462 via a support shaft 469, and the shaft hole 470 of the lever member 433 is formed as a long hole extending in the lateral direction. Yes.

  According to the storage device 460, since the booster mechanism 431 is disposed outside the cylinder body 409, the airtightness of the back pressure chamber 427 of the cylinder body 409 can be improved.

[Twenty-ninth embodiment] Since this embodiment is a modification of the fuel supply apparatus of the first embodiment (see FIG. 1), the changed portion will be described, and a duplicate description will be omitted. FIG. 45 is a configuration diagram showing an outline of the fuel supply apparatus. As shown in FIG. 45, in the fuel supply device (reference numeral 472) of this embodiment, a storage device (reference numeral 474) is arranged in parallel with the fuel pump 12.

  In the storage device 474, the fuel inlet 34 and the fuel outlet 36 of the storage device 16 (see FIG. 1) of the first embodiment are omitted. Instead, the cylinder body 24 is formed with a high-pressure fuel inlet / outlet 476 that communicates between the inside and outside of the storage chamber 30 and a low-pressure fuel inlet / outlet 478 that communicates between the inside and outside of the back pressure chamber 32. The fuel pump 12 is provided with a fuel filter 480 that filters inhaled fuel. The fuel passage 20 extending from the fuel pump 12 to the fuel injection valve 22 is referred to as a high pressure side fuel passage (same reference numeral), and the fuel passage extending from the fuel filter 480 to the fuel pump 12 is referred to as a low pressure side fuel passage 482.

  The high-pressure side fuel passage 20 is in communication with the storage chamber 30 of the storage device 474. Specifically, a first branch passage 484 branched from between the fuel pump 12 and the pressure regulating valve 14 in the high pressure side fuel passage 20 is connected to the low pressure fuel inlet / outlet 478 of the storage device 474.

  The low-pressure side fuel passage 482 communicates with the back pressure chamber 32 of the storage device 474. Specifically, a second branch passage 486 branched from between the fuel filter 480 and the fuel pump 12 in the low pressure side fuel passage 482 is connected to the low pressure fuel inlet / outlet 478 of the storage device 474.

  The operation of the fuel supply device 472 will be described.

<When Accumulated Fuel is Accumulated (see FIG. 46)> When the fuel pump 12 is operated as the engine is driven at a low load, the pressurized fuel sucked and pressurized from the fuel tank 18 is fueled. While being supplied to the injection valve 22 (see arrow A1 in FIG. 46), the pressurized fuel is accumulated in the accumulation chamber 30 (see arrow A2 in FIG. 46). Specifically, when the engine is under a low load, the fuel consumption of the fuel injection valve 22 is small. Therefore, of the pressurized fuel discharged from the fuel pump 12, the excess pressurized fuel that is not consumed by the engine is accumulated in the accumulator 474. Is stored in the storage chamber 30. In addition, when the engine is idle stopped, the pressurized fuel discharged from the fuel pump 12 is accumulated in the accumulation chamber 30 of the accumulation device 474.

<When pressurized fuel is supplied by the storage device 474 (see FIG. 47)> When the full tank detection sensor 38 detects a full tank, the control device 42 determines that the storage chamber 30 is almost full, and the fuel The drive of the pump 12 is stopped. Thereby, the pressurized fuel in the accumulation chamber 30 is supplied to the fuel injection valve 22 by the elastic restoring force of the coil spring 28 (see arrow B1 in FIG. 47). As the volume of the back pressure chamber 32 increases, the fuel in the fuel tank 18 is sucked into the back pressure chamber 32 (see arrow B2 in FIG. 47).

  When empty tank is detected by the empty tank detection sensor 40, the control device 42 determines that the storage chamber 30 is nearly empty and restarts the driving of the fuel pump 12. The full tank detection sensor 38 and / or the empty tank detection sensor 40 may be replaced with a detection switch.

<When the engine is heavily loaded (WOT) (see FIG. 48)> When the engine is temporarily heavily loaded, the fuel consumption of the fuel injection valve 22 becomes large. Therefore, the pressurized fuel from the fuel pump 12 is supplied to the fuel injection valve 22 (see arrow C1 in FIG. 48), and the pressurized fuel in the accumulation chamber 30 is caused by the elastic restoring force of the coil spring 28. (See arrow C2 in FIG. 48). Further, as the volume of the back pressure chamber 32 increases, the fuel in the fuel tank 18 is sucked into the back pressure chamber 32 (see arrow C3 in FIG. 48). Therefore, the enlargement of the fuel pump 12 can be suppressed.

<Supplement for Accumulation of Pressurized Fuel> When fuel is accumulated in the back pressure chamber 32 of the accumulator 474 at the time of accumulation of the pressurized fuel, along with the accumulation of the pressurized fuel in the accumulation chamber 30 The fuel in the back pressure chamber 32 is discharged into the low pressure side fuel passage 482 (see arrow A3 in FIG. 46). At this time, the amount of fuel drawn from the fuel filter 480 by the fuel pump 12 varies depending on the ratio between the fuel consumption of the fuel injection valve 22 and the fuel outflow amount from the back pressure chamber 32.

  According to the fuel supply device 472, when the fuel consumption of the fuel injection valve 22 is small, the pressurized fuel discharged from the fuel pump 12 is accumulated in the accumulation chamber 30 via the high-pressure side fuel passage 20. Further, when the fuel pump 12 is stopped, the fuel in the accumulation chamber 30 is supplied to the high-pressure side fuel passage 20 by the biasing force of the coil spring 28. At this time, the fuel in the low pressure side fuel passage 482 is sucked into the back pressure chamber 32 due to the increase in the volume of the back pressure chamber 32 due to the volume reduction of the accumulation chamber 30. Further, the fuel in the back pressure chamber 32 is discharged into the low pressure side fuel passage 482 due to a decrease in the volume of the back pressure chamber 32 accompanying an increase in the volume of the accumulation chamber 30 accompanying the accumulation of pressurized fuel in the accumulation chamber 30. Therefore, the back pressure chamber 32 of the storage device 474 can be utilized to reduce pump work and improve volumetric efficiency.

  Further, the fuel in the back pressure chamber 32 is supplied to the fuel pump 12, whereby the suction negative pressure of the fuel pump 12 can be suppressed and the vapor lock resistance can be improved. In the case of a demand control system that combines a pressure sensor that detects the pressure of pressurized fuel on the fuel injection valve 22 side and pump control by a control device, the pressure regulating valve 14 may be omitted.

[Third Embodiment] This embodiment is a modification of the twenty-ninth embodiment (see FIG. 45), and therefore, the changed portion will be described, and a duplicate description will be omitted. FIG. 49 is a sectional view showing an outline of the fuel pump device. As shown in FIG. 49, in the present embodiment, a fuel pump device 492 is configured by integrating a storage device (reference numeral 488) and a fuel pump (reference numeral 490).

  In the storage device 488, the high-pressure fuel inlet / outlet 476 and the low-pressure fuel inlet / outlet 478 of the storage device 488 (see FIG. 45) of Embodiment 29 are omitted. Instead, the cylinder main body 24 is formed with a high-pressure fuel inlet 494 and a high-pressure fuel outlet 496 that communicate with the inside and outside of the storage chamber 30. Further, a low-pressure fuel inlet 498 and a low-pressure fuel outlet 500 that communicate between the inside and outside of the back pressure chamber 32 are formed. The high-pressure fuel inlet 494 and the low-pressure fuel outlet 500 are arranged in parallel vertically with respect to the side wall portion of the cylinder body 24. The low pressure fuel inflow port 498 and the low pressure fuel outflow port 500 are disposed at opposite positions on the side wall portion of the cylinder body 24. The high pressure fuel outlet 496 is disposed on the upper wall portion of the cylinder body 24.

  A fuel suction port 490 a of a fuel pump 490 is connected to the low pressure fuel outlet 500. A fuel discharge port 490 b of the fuel pump 490 is connected to the high pressure fuel inlet 494. A check valve 502 that restricts the backflow of pressurized fuel is provided in the fuel discharge port 490b. A fuel filter (reference numeral 504) is connected to the low-pressure fuel inlet 498. The high-pressure fuel outlet 496 is connected to the high-pressure fuel passage 20 reaching the fuel injection valve 22.

[Embodiment 31] Since this embodiment is a modification of the fuel pump device of Embodiment 30 (see FIG. 49), the changed portion will be described, and redundant description will be omitted. FIG. 50 is a sectional view showing an outline of the fuel pump device. As shown in FIG. 50, in the fuel pump device (reference numeral 506) of this embodiment, the low-pressure fuel inlet (reference numeral 508) is disposed on the lower wall portion of the cylinder body 24. A fuel filter (reference numeral 510 is attached) is connected to the low-pressure fuel inlet 508.

[Thirty-second Embodiment] This embodiment is a modification of the fuel pump device according to the thirty-first embodiment (see FIG. 50). FIG. 51 is a cross-sectional view showing an outline of the fuel pump device. As shown in FIG. 51, in the fuel pump device (reference numeral 512) of the present embodiment, a slight gap 514 is set between the inner peripheral surface of the cylinder chamber 25 of the cylinder body 24 and the piston 26. . The piston 26 is formed with a dented cylindrical fitting recess 515. The upper end of the coil spring 28 is fitted in the fitting recess 515. In FIG. 51, a fuel filter (reference numeral 516) having a smaller dimension in the width direction (left-right direction in FIG. 51) than the fuel filter 510 of Embodiment 31 (see FIG. 50) is used.

  In the fuel pump device 512, even if the pressurized fuel in the accumulation chamber 30 leaks into the back pressure chamber 32 from the gap 514 between the cylinder body 24 and the piston 26, the piston 26 is reduced when the volume of the back pressure chamber 32 is reduced. As a result, the fuel is sucked from the back pressure chamber 32 to the fuel pump 490 side, so that a quantitative loss of fuel can be suppressed.

[Thirty-third Embodiment] This embodiment is a modification of the fuel pump device of the thirty-second embodiment (see FIG. 51), and therefore, the changed portion will be described and redundant description will be omitted. FIG. 52 is a cross-sectional view showing an outline of the fuel pump device. As shown in FIG. 52, in the fuel pump device (reference numeral 518) of this embodiment, a piston ring 520 is mounted on the outer peripheral portion of the piston 26. The piston ring 520 suppresses pressurized fuel leakage from the gap 514 between the inner peripheral surface of the cylinder chamber 25 and the piston 26.

[Thirty-fourth embodiment] Since this embodiment is a modification of the fuel pump device of the thirty-third embodiment (see FIG. 52), the changed portion will be described, and the redundant description will be omitted. FIG. 53 is a sectional view showing an outline of the fuel pump device. As shown in FIG. 53, in the fuel pump device (reference numeral 522) of this embodiment, a diaphragm 524 is installed between the inner peripheral surface of the cylinder chamber 25 of the cylinder body 24 and the piston 26. The diaphragm 524 prevents pressurized fuel leakage from the gap 514 between the cylinder body 24 and the piston 26.

[Thirty-fifth Embodiment] Another embodiment of the storage device of the twenty-ninth embodiment (see FIG. 45) is shown. FIG. 54 is a side sectional view showing the storage device. As shown in FIG. 54, the storage device (denoted by reference numeral 526) of this embodiment includes a cylinder body 528, a piston 530, and a coil spring 532. The cylinder main body 528 includes a cylindrical member 534 and a pair of upper and lower cover members 536 and 538. The cylindrical member 534 is made of metal and has a hollow cylindrical shape. The inside of the cylindrical member 534 is a cylinder chamber 540. The upper cover member 536 is made of resin and has a fuel inlet 536a and a fuel outlet 536b. The lower cover member 538 is made of resin and has a fuel inlet 538a and a fuel outlet 538b. Both cover members 536 and 538 are attached to the tubular member 534 by caulking so as to close both upper and lower end surfaces of the tubular member 534.

  The piston 530 is made of resin and has a disk shape. The piston 530 is disposed in the cylinder chamber 540 of the cylinder body 528 so as to be movable, that is, displaceable within a predetermined range in the axial direction (vertical direction). The piston 530 divides the inside of the cylinder chamber 540 into two upper and lower chambers whose volume can be changed. The upper chamber is a storage chamber 542 and the lower chamber is a back pressure chamber 544. Therefore, the upper cover member 536 is a high pressure side cover member, and the lower cover member 538 is a low pressure side cover member. The piston 530 is formed with a dented cylindrical fitting recess 546. The piston 530 corresponds to a “movable partition wall” in this specification.

  The coil spring 532 is made of metal, and is interposed between the surface facing the piston 530 in the back pressure chamber 544. The coil spring 532 biases the piston 530 in the contracting direction of the accumulation chamber 542, that is, upward. The upper end portion of the coil spring 532 is fitted in the fitting recess 546 of the piston 530. The coil spring 532 corresponds to a “biasing member” in this specification.

  An upstream passage portion 482a of the low pressure side fuel passage 482 reaching the fuel filter 516 is connected to the fuel inlet 538a of the lower cover member 538. A downstream passage portion 482 b of the low pressure side fuel passage 482 reaching the fuel pump 12 is connected to the fuel inlet 538 b of the lower cover member 538. Further, the upstream side passage portion 20 a of the high pressure side fuel passage 20 reaching the fuel pump 12 is connected to the fuel inlet 536 a of the upper cover member 536. A downstream passage portion 20b of the high-pressure fuel passage 20 reaching the fuel injection valve 22 is connected to the fuel outlet 536b of the upper cover member 536.

[Thirty-sixth embodiment] Since this embodiment is a modification of the fuel supply apparatus of the first embodiment (see FIG. 1), the changed portion will be described, and a duplicate description will be omitted. FIG. 55 is a configuration diagram showing an outline of the fuel supply device. As shown in FIG. 55, in the fuel supply device of the present embodiment (reference numerals 550), the storage device (reference numerals 552) is turned upside down from the storage device 16 of the first embodiment (see FIG. 1). Is arranged.

  The pressure regulating valve (reference numeral 554) is different from the pressure regulating valve 14 of the first embodiment (see FIG. 1). The pressure regulating valve 554 is a flow rate throttle type fuel pressure adjusting valve as a pressure reducing valve that adjusts the fuel pressure in the fuel passage 20 without discharging the pressurized fuel in the fuel passage 20. The flow restrictor type fuel pressure regulating valve opens the fuel passage 20 when the fuel pressure in the fuel passage 20 is lower than the control pressure, and the fuel passage 20 when the fuel pressure in the fuel passage 20 is higher than the control pressure. It is a thing which obstructs. Such a fuel pressure regulating valve is described in, for example, Japanese Patent Laid-Open No. 2000-248999.

  A first check valve 556 that restricts the backflow of pressurized fuel is provided between the fuel pump 12 and the storage device 552 in the fuel passage 20. The first check valve 556 is opened by the fuel pressure of the pressurized fuel of the fuel pump 12, and is closed when the fuel pump 12 is stopped to prevent a back flow and keep the residual pressure in the fuel passage 20. Note that the first check valve 556 may be integrated with the fuel pump 12.

  A relief valve 558 that regulates the fuel pressure in the fuel passage 20 to a predetermined pressure is provided between the storage device 552 and the pressure regulating valve 554 in the fuel passage 20. The relief valve 558 is a mechanical relief valve, which is normally closed and opens when the fuel pressure in the fuel passage 20 rises to a predetermined value or more, and the fuel in the fuel passage 20 is supplied as fuel. It escapes into the tank 18. Therefore, the internal pressure of the fuel pressure in the fuel passage 20 is regulated to a predetermined pressure by the relief valve 558. Note that the relief valve 558 may be integrated with the storage device 552 or the pressure regulating valve 554.

  Between the storage device 552 and the relief valve 558 in the fuel passage 20, a second check valve 560 that restricts the backflow of pressurized fuel is provided. The second check valve 560 opens with the fuel supply pressure of the storage device 552. Further, the backflow is prevented by the valve closing when the supply fuel pressure of the storage device 552 is lowered, and the residual pressure is held in the fuel passage 20. Note that the second check valve 560 may be integrated with the storage device 552.

  According to the fuel supply device 550, the fuel pressure can be adjusted by the pressure regulating valve 554 provided in the fuel passage 20 downstream of the storage device 552 in the fuel tank 18 without discharging the pressurized fuel in the fuel passage 20. Can do. For this reason, the pressure detection device for detecting the fuel pressure in the fuel passage 20 downstream of the storage device 552 in the fuel tank 18 is omitted, and there is no need to control the fuel pump 12 by the control device 42 based on the pressure detection device.

  Further, the fuel pressure in the fuel passage 20 can be regulated to a predetermined pressure by the relief valve 558 provided in the fuel passage 20 between the storage device 552 and the pressure regulating valve 554. Thereby, an abnormal increase in the fuel pressure in the fuel passage 20 between the storage device 552 and the pressure regulating valve 554 can be suppressed. Further, when the engine is stopped, the residual pressure of the fuel pressure in the fuel passage 20 can be gradually reduced due to inevitable minute fuel leakage from the relief valve 558. For this reason, the fuel leakage from the fuel injection valve 22 can be suppressed.

  Further, the backflow of the pressurized fuel can be restricted by the second check valve 560 provided in the fuel passage 20 between the storage device 552 and the relief valve 558. Thereby, the residual pressure of the fuel pressure can be held in the fuel passage 20 between the storage device 552 and the relief valve 558. For this reason, the engine can be restarted smoothly.

[Thirty-seventh Embodiment] Since this embodiment is a modification of the fuel supply device of the thirty-sixth embodiment (see FIG. 55), the changed portion will be described, and a duplicate description will be omitted. FIG. 56 is a block diagram showing an outline of the fuel supply device. As shown in FIG. 56, in the fuel supply device of this embodiment (reference numeral 562), the relief valve 558 of Embodiment 36 (see FIG. 55) is a fuel on the downstream side of the pressure regulating valve 554 in the fuel tank 18. It is arranged in the passage 20.

  According to the fuel supply device 562, the fuel pressure in the fuel passage 20 can be regulated to a predetermined pressure by the relief valve 558 provided in the fuel passage 20 downstream of the pressure regulating valve 554 in the fuel tank 18. Thereby, an abnormal increase in fuel pressure in the fuel passage 20 downstream of the pressure regulating valve 554 in the fuel tank 18 can be suppressed. Further, when the engine is stopped, the residual pressure of the fuel pressure in the fuel passage 20 can be gradually reduced due to inevitable minute fuel leakage from the relief valve 558. For this reason, the fuel leakage from the fuel injection valve 22 can be suppressed.

[Thirty-eighth embodiment] Since this embodiment is a modification of the fuel supply apparatus of the thirty-sixth embodiment (see FIG. 55), the changed portion will be described, and a duplicate description will be omitted. FIG. 57 is a block diagram showing an outline of the fuel supply device. As shown in FIG. 57, in the fuel supply device (reference numeral 564) of the present embodiment, a diaphragm 566 is mounted between the cylinder body 24 and the piston 26 of the storage device 552. Diaphragm 566 prevents pressurized fuel leakage from between cylinder body 24 and piston 26. For this reason, according to the fuel supply apparatus 564, the 2nd check valve 560 required by Embodiment 36 (refer FIG. 55) is omissible.

[Thirty-ninth embodiment] Since this embodiment is a modification of the fuel supply apparatus of the thirty-sixth embodiment (see FIG. 55), the changed portion will be described, and the redundant description will be omitted. FIG. 58 is a block diagram showing an outline of the fuel supply device. As shown in FIG. 58, in the fuel supply device (reference numeral 568) of this embodiment, a pressure relief hole 570 is provided in the fuel passage 20 between the storage device 552 and the second check valve 560. It has been. The pressure release hole 570 is configured to allow the fuel in the fuel passage 20 to escape into the fuel tank 18 like a fuel leak. Therefore, the residual fuel pressure in the fuel passage 20 between the storage device 552 and the second check valve 560 can be gradually reduced due to fuel leakage from the pressure release hole 570 after the engine is stopped. . For this reason, the fuel leak (oil tight leak) from the fuel injection valve 22 can be prevented.

[Embodiment 40] Since this embodiment is a modification of the fuel supply apparatus of Embodiment 36 (see FIG. 55), the changed portion will be described, and the redundant description will be omitted. FIG. 59 is a block diagram showing an outline of the fuel supply device. As shown in FIG. 59, in the fuel supply device (reference numeral 572) of the present embodiment, a pressure release opening / closing valve 574 is provided in the fuel passage 20 between the storage device 552 and the second check valve 560. Is provided. The pressure release on / off valve 574 is an electromagnetic valve that is controlled to open and close by the control device 42.

  Therefore, the pressurized fuel can be efficiently stored in the storage device 552 by closing the pressure release on / off valve 574. For this reason, it is preferable to close the pressure relief opening / closing valve 574 during operation of the engine. Further, by opening the pressure release on / off valve 574, the fuel pressure in the fuel passage 20 between the storage device 552 and the second check valve 560 can be reduced. For this reason, after the engine is stopped, the pressure release on-off valve 574 is closed to prevent fuel leakage (oil-tight leakage) from the fuel injection valve 22.

[Other Embodiments] The present invention is not limited to the embodiments and can be modified without departing from the gist of the present invention. For example, the movable partition wall of the storage device is not limited to a piston but may be a diaphragm. The biasing member of the storage device is not limited to metal but may be rubber. Further, the accumulation device is not limited to fuel, and may be applied to an accumulation device that accumulates a liquid such as oil or water discharged from a pump in a pressurized state and discharges the liquid.

DESCRIPTION OF SYMBOLS 10 ... Fuel supply device 12 ... Fuel pump 16 ... Accumulation device 18 ... Fuel tank 20 ... Fuel passage (high pressure side fuel passage)
22 ... Fuel injection valve (fuel injection device)
25 ... Cylinder chamber 26 ... Piston (movable partition)
28 ... Coil spring (biasing member)
44 ... Accumulator 46 ... Cylinder body 47 ... Cylinder chamber 48 ... Piston (movable partition)
50 ... Coil spring (biasing member)
54 ... Cover member (part of frame member)
56 ... Inner layer member (cylinder member)
58 ... Outer layer member (part of frame member)
70 ... Accumulating chamber 72 ... Back pressure chamber 78 ... Accumulating device 80 ... Cylinder body 81 ... Cylinder chamber 82 ... Piston (movable partition wall)
84 ... Coil spring (biasing member)
88 ... Cover member (part of frame member)
90 ... Inner layer member (cylinder member)
92 ... Outer layer member (part of frame member)
DESCRIPTION OF SYMBOLS 100 ... Accumulation chamber 102 ... Back pressure chamber 108 ... Accumulator 110 ... Cylinder main body 111 ... Cylinder chamber 112 ... Piston (movable partition)
114: Coil spring (biasing member)
116 ... Cylinder member 118 ... Frame member 135 ... Storage chamber 137 ... Back pressure chamber 144 ... Storage device 146 ... Cylinder body 147 ... Cylinder chamber 148 ... Piston (movable partition wall)
151, 152 ... Coil spring (biasing member)
168 ... Accumulation chamber 170 ... Back pressure chambers 174 to 176 ... Coil spring (biasing member)
180 ... Accumulator 182 ... Cylinder body 183 ... Cylinder chamber 184 ... Piston (movable partition wall)
186 ... Coil spring (biasing member)
205 ... Accumulation chamber 207 ... Back pressure chamber 212 ... Accumulation device 214 ... Cylinder body 215 ... Cylinder chamber 216 ... Piston (movable partition)
218 ... Coil spring (biasing member)
220 ... Cylinder member 222 ... Frame member 243 ... Accumulation chamber 245 ... Back pressure chamber 251 ... Accumulation device 253 ... Cylinder body 254 ... Cylinder chamber 255 ... Piston (movable partition)
257: Wave washer (biasing member)
273 ... Accumulation chamber 275 ... Back pressure chamber 281 ... Wave washer (biasing member)
285 ... Wave washer (biasing member)
289 ... Wave washer (biasing member)
293 ... Wave washer (biasing member)
297 ... Wave washer
303 ... Wave washer (biasing member)
315 ... Accumulator 317 ... Coiled wave spring (biasing member)
319 ... Accumulator 321 ... Coiled wave spring (biasing member)
323 ... Accumulator 325 ... Cylinder body 326 ... Cylinder chamber 327 ... Piston (movable partition wall)
329 ... Coil spring (biasing member)
337 ... Accumulation chamber 339 ... Back pressure chamber 341 ... Booster mechanism 357 ... Accumulation device 359 ... Cylinder body 360 ... Cylinder chamber 363 ... Coil spring (biasing member)
361 ... Piston (movable partition wall)
375 ... Accumulation chamber 377 ... Back pressure chamber 381 ... Booster mechanism 393 ... Accumulation device 399 ... Coil spring 407 ... Accumulation device 409 ... Cylinder body 410 ... Cylinder chamber 413 ... Coil spring (biasing member)
411 ... Piston (movable partition wall)
425 ... Accumulation chamber 427 ... Back pressure chamber 431 ... Boost mechanism 448 ... Accumulation device 454 ... Coil spring 456 ... Accumulation device 460 ... Accumulation device 472 ... Fuel supply device 474 ... Accumulation device 482 ... Low pressure side fuel passage 488 ... Accumulation device 526 ... Accumulation device 550 ... Fuel supply device 552 ... Accumulation device 554 ... Pressure regulating valve (flow rate throttle type fuel pressure regulating valve)
558 ... Relief valve 560 ... Second check valve (check valve)
562 ... Fuel supply device 564 ... Fuel supply device 568 ... Fuel supply device 570 ... Pressure release hole 572 ... Fuel supply device 574 ... Pressure release opening / closing valve

Claims (14)

A fuel pump that sucks and pressurizes and discharges fuel in the fuel tank;
An accumulator that accumulates the pressurized fuel discharged from the fuel pump and supplies the pressurized fuel to the fuel injection device;
A fuel supply device comprising:
The storage device is a fuel supply device arranged in the fuel tank. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a movable partition wall, and an urging member,
The cylinder body has a cylinder chamber,
The movable partition wall is provided so as to be axially displaceable in the cylinder chamber and divides the cylinder chamber into a storage chamber and a back pressure chamber,
The urging member urges the movable partition wall in the reduction direction of the accumulation chamber,
A fuel supply device in which a plurality of the urging members are arranged in parallel. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a movable partition wall, and an urging member,
The cylinder body has a cylinder chamber,
The movable partition wall is provided so as to be axially displaceable in the cylinder chamber and divides the cylinder chamber into a storage chamber and a back pressure chamber,
The urging member urges the movable partition wall in the reduction direction of the accumulation chamber,
A fuel supply device in which a plurality of the urging members are arranged in a multiple ring shape. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a plurality of movable partition walls, and a plurality of urging members,
The inside of the cylinder body has a plurality of cylinder chambers formed in parallel,
Each movable partition is provided in each cylinder chamber so as to be axially displaceable, and the cylinder chamber is divided into a storage chamber and a back pressure chamber,
Each of the urging members urges each movable partition wall in the shrinking direction of each accumulation chamber. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a movable partition wall, and an urging member,
The cylinder body has a cylinder chamber,
The movable partition wall is provided so as to be axially displaceable in the cylinder chamber and divides the cylinder chamber into a storage chamber and a back pressure chamber,
The urging member urges the movable partition wall in the reduction direction of the accumulation chamber,
A fuel supply device in which a plurality of the urging members are arranged in series. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a movable partition wall, and an urging member,
The cylinder body has a cylinder chamber,
The movable partition wall is provided so as to be axially displaceable in the cylinder chamber and divides the cylinder chamber into a storage chamber and a back pressure chamber,
The urging member urges the movable partition wall in the reduction direction of the accumulation chamber,
A fuel supply apparatus comprising a booster mechanism that boosts and transmits the biasing force of the biasing member to the movable partition wall. The fuel supply device according to any one of claims 1 to 6,
The cylinder main body of the storage device includes a resin cylinder member that forms at least a side wall portion of the cylinder chamber, and a metal frame member that reinforces the cylinder member. The fuel supply device according to claim 1,
The storage device includes a cylinder body, a movable partition wall, and an urging member,
The cylinder body has a cylinder chamber,
The movable partition wall is provided so as to be axially displaceable in the cylinder chamber and divides the cylinder chamber into a storage chamber and a back pressure chamber,
The urging member urges the movable partition wall in the reduction direction of the accumulation chamber,
The accumulation chamber communicates with a high-pressure side fuel passage through which pressurized fuel discharged from the fuel pump flows.
The fuel supply device, wherein the back pressure chamber is in communication with a low pressure fuel passage through which fuel sucked into the fuel pump flows. The fuel supply device according to claim 1,
A fuel supply device, wherein a fuel passage in the fuel tank downstream of the storage device is provided with a flow rate throttle type fuel pressure adjustment valve that adjusts fuel pressure without discharging pressurized fuel. The fuel supply device according to claim 9,
The fuel supply device, wherein a relief valve that regulates a fuel pressure in the fuel passage to a predetermined pressure is provided in a fuel passage in the fuel tank downstream of the fuel pressure regulating valve. The fuel supply device according to claim 9,
A fuel supply device, wherein a relief valve that regulates a fuel pressure in the fuel passage to a predetermined pressure is provided in a fuel passage between the storage device and the fuel pressure regulating valve. The fuel supply device according to claim 11,
A fuel supply device, wherein a check valve for restricting the backflow of pressurized fuel is provided in a fuel passage between the storage device and the relief valve. The fuel supply device according to claim 12, comprising:
A fuel supply device, wherein a pressure relief hole is provided in a fuel passage between the storage device and the check valve. The fuel supply device according to claim 12, wherein
A fuel supply device, wherein a pressure release opening / closing valve is provided in a fuel passage between the storage device and the check valve.

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