CN107850026B - Fuel injection pump, fuel injection device, and internal combustion engine - Google Patents
Fuel injection pump, fuel injection device, and internal combustion engine Download PDFInfo
- Publication number
- CN107850026B CN107850026B CN201680018967.XA CN201680018967A CN107850026B CN 107850026 B CN107850026 B CN 107850026B CN 201680018967 A CN201680018967 A CN 201680018967A CN 107850026 B CN107850026 B CN 107850026B
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- fuel
- plunger
- fuel injection
- valve
- pump housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A fuel injection pump, a fuel injection device, and an internal combustion engine are provided with: a pump housing (21); a plunger cylinder (22) disposed in the pump housing (21); a plunger (23) supported so as to be movable in the axial direction within the plunger cylinder (22); an intake valve (24) that divides the fuel compression chamber (67) from the plunger cylinder (22) and the plunger (23), and that can take in fuel from the outside into the fuel compression chamber (67); and a discharge valve (25) capable of discharging the fuel in the fuel compression chamber (67) to the outside, wherein the plunger cylinder (22), the suction valve (24), and the discharge valve (25) are arranged in a linear manner along the longitudinal direction in the pump housing (21), and the outer wall surfaces thereof are supported by the inner wall surface of the pump housing (21).
Description
Technical Field
The present invention relates to a fuel injection pump for an internal combustion engine mounted on a ship, a fuel injection device to which the fuel injection pump is applied, and an internal combustion engine to which the fuel injection device is applied.
Background
For example, as a fuel injection device applied to a diesel engine of an internal combustion engine mounted on a ship, there is a device described in the following patent document. The fuel injection device described in patent documents 1 and 2 includes: a fuel injection valve that injects fuel into the combustion chamber; a fuel injection pump provided with a plunger for pressure-feeding fuel to the fuel injection valve; and a pressure accumulating pipe control valve block body for controlling the action of the plunger. The fuel injection pump includes a pump housing, a plunger cylinder, a plunger, an intake valve, and a discharge valve.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2003-328897
Patent document 2: japanese patent laid-open publication No. 2013-139737
Technical problem to be solved by the invention
In the above-described conventional fuel injection pump, a plunger cylinder is attached to the inside of a pump housing, a plunger is supported on the inside of the plunger cylinder so as to be movable in the axial direction, and an intake valve and a discharge valve are disposed on the inside of the plunger cylinder in front of the plunger. That is, the pump housing, the plunger barrel, the suction valve, and the discharge valve have a triple structure in the radial direction. Therefore, there is a problem that the outer diameter of the fuel injection pump becomes large.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object thereof is to provide a fuel injection pump, a fuel injection device, and an internal combustion engine that can be downsized.
Means for solving the problems
The fuel injection pump according to the present invention for achieving the above object includes: a pump housing; a plunger cylinder disposed within the pump housing; a plunger supported to be movable in an axial direction in the plunger cylinder; and an intake valve that defines a fuel compression chamber with the plunger barrel and the plunger and is capable of sucking fuel from outside into the fuel compression chamber, wherein the plunger barrel and the intake valve are arranged linearly in a longitudinal direction in the pump housing, and outer wall surfaces of the plunger barrel and the intake valve are supported by an inner wall surface of the pump housing.
Therefore, the plunger barrel and the suction valve are linearly arranged in the pump housing, and the outer wall surface is supported by the pump housing, so that the pump housing can be reduced in diameter, and the fuel injection pump as a whole can be reduced in diameter and size.
In the fuel injection pump of the present invention, the plunger is urged and supported in a first direction away from the fuel compression chamber by a return spring, the return spring is a compression coil spring disposed between the pump housing and the plunger, one end portion of the return spring is elastically pressed against a spring receiving portion in the pump housing, and the other end portion of the return spring is elastically pressed against a spring receiving member of the plunger.
Therefore, the return spring that biases and supports the plunger in the first direction is interposed between the spring receiving portion of the pump housing and the spring receiving member of the plunger, and thus the ease of assembly of the plunger, the return spring, the plunger barrel, and the like into the pump housing can be improved.
The fuel injection pump according to the present invention further includes a discharge valve capable of discharging the fuel in the fuel compression chamber to the outside, wherein the plunger cylinder is restricted from moving in the first direction by a stopper provided on an inner wall surface of the pump housing, and the suction valve and the discharge valve are compressed and held by a pressing member in a state in which they are arranged in close contact with each other in a straight line.
Therefore, by compressing and holding the plunger barrel, the suction valve, and the discharge valve in the pump housing, no tensile stress acts on the plunger barrel and the like, and thus the fatigue strength can be improved.
In the fuel injection pump of the present invention, the plunger cylinder, the suction valve, and the discharge valve are set to have the same maximum outer diameter dimension.
Therefore, since the maximum outer diameters of the plunger barrel, the suction valve, and the discharge valve are the same, the inner diameter processing of the pump housing can be simplified, the processing cost can be reduced, and the plunger barrel, the suction valve, and the discharge valve can be easily inserted and fixed into the pump housing, and the assembling property can be improved.
In the fuel injection pump of the present invention, the suction valve is provided with a small diameter portion having an outer diameter smaller than an inner diameter of the pump housing, so that a fuel supply and discharge chamber is formed between the small diameter portion and the pump housing, and the fuel supply and discharge chamber communicates with the fuel compression chamber via a fuel suction passage.
Therefore, by forming the fuel supply/discharge chamber by providing the small diameter portion in the suction valve, it is possible to reduce the processing cost without processing the concave portion in the inner wall surface of the pump housing, and it is possible to reduce the thickness of the pump housing, and to reduce the diameter and size of the entire fuel injection pump.
Further, a fuel injection device according to the present invention includes: a fuel injection valve that injects fuel into a combustion chamber of an internal combustion engine; the fuel injection pump that supplies fuel to the fuel injection valve; and a common rail control valve device that controls the operation of the plunger in the fuel injection pump.
Therefore, the fuel injection pump as a whole can be made smaller in diameter and smaller in size, thereby achieving reduction in size and weight of the fuel injection device.
Further, the internal combustion engine according to the present invention is provided with the fuel injection device.
Therefore, the fuel injection pump as a whole can be made smaller in diameter and smaller in size, thereby achieving reduction in size and weight of the internal combustion engine.
Effects of the invention
According to the fuel injection pump, the fuel injection device, and the internal combustion engine of the present invention, the entire fuel injection pump can be made smaller in diameter and smaller in size.
Drawings
Fig. 1 is a schematic cross-sectional view showing a fuel injection pump of the present embodiment.
Fig. 2 is a sectional view showing a main part of the fuel injection pump of the present embodiment.
Fig. 3 is a sectional view III-III of fig. 2.
Fig. 4 is a schematic configuration diagram showing a fuel injection device of the present embodiment.
Detailed Description
Preferred embodiments of a fuel injection pump, a fuel injection device, and an internal combustion engine according to the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to the embodiment, and when there are a plurality of embodiments, the present invention also includes a configuration in which the respective embodiments are combined.
Fig. 4 is a schematic configuration diagram showing a fuel injection device of the present embodiment.
In the present embodiment, as shown in fig. 4, the fuel injection device 10 is mounted on a large-sized marine diesel engine (internal combustion engine) mounted on a ship. The fuel injection device 10 includes a fuel injection valve 11, a fuel injection pump 12, and a rail control valve block 13.
The fuel injection valve 11 injects fuel into a combustion chamber of a diesel engine, not shown. The fuel injection pump 12 pressure-feeds the fuel to the fuel injection valve 11, and the fuel injection valve 11 is connected to the fuel injection pump 12 via a fuel pipe 14. The accumulator control valve block 13 drives and controls the fuel injection pump 12, and the accumulator control valve block 13 is provided on a cylinder block side surface of the diesel engine or the like, and the fuel injection pump 12 configured in a tower shape is provided vertically above the accumulator control valve block 13.
Next, the fuel injection pump 12 of the present embodiment will be described in detail. Fig. 1 is a schematic sectional view showing a fuel injection pump of the present embodiment, fig. 2 is a sectional view showing a main part of the fuel injection pump of the present embodiment, and fig. 3 is a sectional view taken along line III-III of fig. 2.
As shown in fig. 1 to 3, the fuel injection pump 12 of the present embodiment includes a pump housing 21, a plunger cylinder 22, a plunger 23, an intake valve 24, and a discharge valve 25. The plunger cylinder 22, the suction valve 24, and the discharge valve 25 are disposed in a linear arrangement so as to be formed linearly in the longitudinal direction in the pump housing 21, and the outer wall surfaces thereof are supported by the inner wall surface of the pump housing 21.
The pump housing 21 includes a housing main body 31 formed in a cylindrical shape, a housing mounting table 32 formed in a cylindrical shape, and a pressing member 33 formed in a cylindrical shape. The housing body 31 is provided with a first receiving portion 34 and a second receiving portion 35, the first receiving portion 34 receives most of the plunger cylinder 22, the suction valve 24, the discharge valve 25, and the like, and the second receiving portion 35 receives the plunger 23 and the like. The first receiving portion 34 and the second receiving portion 35 are formed of a continuous space portion, the first receiving portion 34 is positioned above the second receiving portion 35, and the inner diameter of the second receiving portion 35 is set to be larger than the inner diameter of the first receiving portion 34.
The housing mount 32 is coupled by a coupling bolt (not shown) by fitting an outer peripheral surface of an upper end portion of the housing mount 32 to an inner peripheral surface of a lower end portion (second receiving portion 35) of the housing body 31. The housing mounting table 32 has a support hole 36 formed in a radially central portion thereof to support the plunger 23 to be movable in the axial direction. The lower end portion of the housing mount 32 is fixed to the upper surface portion of the accumulator control valve block 13 (see fig. 4).
The outer peripheral surface of the lower end of the pressing member 33 is fitted and fixed to the inner peripheral surface of the upper end (first receiving portion 34) of the housing body 31. The outer diameter of the pressing member 33 is the same as the outer diameter of the housing body 31, the pressing member 33 is provided with a fitting portion 37, the fitting portion 37 is fitted to the upper end portion of the first receiving portion 34 of the housing body 31 to press the discharge valve 25, and a plurality of attachment holes 38 are formed at predetermined intervals in the circumferential direction on the outer circumferential surface side of the pressing member 33. The pressing member 33 is fixed to the housing body 31 in a state in which the fitting portion 37 is fitted into the first receiving portion 34 of the housing body 31 and is in close contact with the upper end surface of the housing body 31, and a plurality of fastening bolts 39 are inserted through the mounting holes 38 and screwed into screw holes 40 formed in the housing body 31.
The plunger 22 is disposed in the housing body 31 of the pump housing 21. The plunger cylinder 22 is provided with an upper large diameter portion 41 and a lower small diameter portion 42, and an inclined surface 43 connecting an outer peripheral surface of the large diameter portion 41 and an outer peripheral surface of the small diameter portion 42 is formed between the large diameter portion 41 and the small diameter portion 42. On the other hand, the pump housing 21 is provided with a protruding portion (stopper) 44 that protrudes toward the radial center portion on the inner peripheral surface of the first receiving portion 34. The projection 44 is formed in a ring shape, and an inclined surface 45 is formed at the upper portion. The inclined surface 45 of the projection 44 is set at the same angle as the inclined surface 43 of the plunger cylinder 22. Further, a support hole 46 for supporting the plunger 23 to be movable in the axial direction is formed in a radially central portion of the plunger cylinder 22.
Therefore, the plunger tube 22 is disposed in the pump housing 21, and is positioned by the inclined surface 43 abutting against the inclined surface 45 of the projection 44, thereby restricting the movement in the first direction (downward in the axial direction) a.
The plunger 23 is provided with an upper small diameter portion 47 and a lower large diameter portion 48, the upper surface of the small diameter portion 47 being a pressure surface 49, and the lower surface of the large diameter portion 48 being a pressure receiving surface 50. The plunger 23 is disposed in the housing main body 31 of the pump housing 21, the small diameter portion 47 is supported in the support hole 46 of the plunger cylinder 22 so as to be movable in the axial direction, and the large diameter portion 48 is supported in the support hole 36 of the housing mount 32 so as to be movable in the axial direction.
The plunger 23 is biased and supported in the first direction a by the biasing force of the return spring 51. The return spring 51 is a compression coil spring and is disposed between the plunger 23 and the housing main body 31. A spring receiving member 52 is fixed to a stepped portion between the small diameter portion 47 and the large diameter portion 48 of the plunger 23. On the other hand, the housing body 31 has a spring receiving portion 53 formed at a stepped portion between an inner wall surface of the first receiving portion 34 and an inner wall surface of the second receiving portion 35. The return spring 51 is elastically pressed against the spring receiving member 52 at a lower end portion thereof, and elastically pressed against the spring receiving portion 53 at an upper end portion thereof, thereby biasing the plunger 23 in the first direction a. The plunger 23 is movable in a second direction B (upward in the axial direction) opposite to the first direction a by the accumulator control valve block 13 (see fig. 4).
The suction valve 24 is composed of a suction valve main body 61, a valve body 62, and a compression spring 63. The suction valve body 61 is provided with an upper small diameter portion 64 and a lower large diameter portion 65, and a fuel passage 66 is formed in a radially central portion of the suction valve body 61 along the axial direction. The suction valve 24 is defined by the suction valve 24, the plunger cylinder 22, and the plunger 23 as a fuel compression chamber 67 located at the center in the radial direction, by the lower surface of the suction valve body 61 coming into close contact with the upper surface of the plunger cylinder 22. Further, a fuel supply/discharge chamber 68 is defined between the small diameter portion 64 of the suction valve main body 61 in the suction valve 24 and the housing main body 31 in the pump housing 21. The fuel supply/discharge chamber 68 is a space portion formed in an annular shape, and communicates with the fuel compression chamber 67 via a plurality of fuel suction passages 69 penetrating the suction valve main body 61 in the radial direction. The pump housing 21 is formed with a fuel supply passage 70 and a fuel discharge passage 71 radially penetrating the housing body 31 at a predetermined interval in the circumferential direction, and one end portions of the fuel supply passage 70 and the fuel discharge passage 71 communicate with the fuel supply/discharge chamber 68 while the other end portions are connected to a fuel supply device (not shown).
The intake valve 24 can take fuel, which is supplied from the outside to the fuel supply/discharge chamber 68 through the fuel supply passage 70, into the fuel compression chamber 67 through the fuel intake passage 69. That is, the valve body 62 is disposed in the fuel passage 66 of the suction valve main body 61 so as to be movable in the axial direction, and is pressed against the suction valve seat by the biasing force of the compression spring 63, thereby blocking the communication between the fuel suction passage 69 and the fuel compression chamber 67. Therefore, when the fuel is supplied from the fuel supply passage 70 to the fuel supply/discharge chamber 68 by the fuel supply device and the pressure of the fuel acting on the valve body 62 from the fuel suction passage 69 becomes high, the valve body 62 is lifted against the biasing force of the compression spring 63 and is separated from the suction valve seat, and the fuel suction passage 69 communicates with the fuel compression chamber 67. Then, the fuel in the fuel supply and discharge chamber 68 is sucked into the fuel compression chamber 67 through the fuel suction passage 69.
The discharge valve 25 is composed of a discharge valve main body 81, a valve body 82, and a compression spring 83. The discharge valve body 81 has a fuel passage 84 formed along the axial direction at the center in the radial direction, and the fuel passages 66 and 84 communicate with each other in a linear arrangement by the lower surface of the discharge valve 25 being in close contact with the upper surface of the intake valve 24. The discharge valve 25 can discharge the fuel supplied to the fuel compression chamber 67 to the outside. That is, the valve body 82 is disposed in the fuel passage 84 of the discharge valve main body 81 so as to be movable in the axial direction, and is pressed against the discharge valve seat by the biasing force of the compression spring 83, thereby blocking the communication between the fuel passage 66 and the fuel passage 84.
Further, the pressing member 33 is provided with a fuel discharge passage 85 at a radially central portion, and a spring receiving portion 86 is provided around the fuel discharge passage 85. One end of the fuel discharge passage 85 communicates with the fuel passage 84, and the other end is connected to a connecting plug 87. The spring housing portion 86 opens toward the discharge valve 25 side and houses the compression spring 83.
Therefore, when the plunger 23 moves in the second direction B and the fuel pressure in the fuel compression chamber 67 increases, the fuel pressure in the fuel compression chamber 67 acts on the valve body 82 through the fuel passage 66. Then, when the fuel pressure in the fuel compression chamber 67 becomes higher, the valve body 82 rises against the urging force of the compression spring 83, and is separated from the discharge valve seat, so that the fuel passage 66 communicates with the fuel passage 84. Then, the fuel in the fuel compression chamber 67 flows through the fuel passage 66 to the fuel passage 84, and is discharged to the outside through the fuel discharge passage 85.
The plunger cylinder 22, the suction valve 24, and the discharge valve 25 are disposed in a linear arrangement in the housing main body 31, and are compressed and held by the pressing member 33 in a state of being disposed in close contact with each other. That is, the plunger cylinder 22, the suction valve 24, and the discharge valve 25 are set to have the same maximum outer diameter dimension in accordance with the inner diameter of the housing main body 31, and thus can be easily inserted from the upper portion of the housing main body 31. Then, the plunger cylinder 22 is restricted from moving in the first direction a by the inclined surface 43 abutting against the inclined surface 45 of the projection 44 in the housing main body 31. The intake valve 24 is positioned in contact with the upper surface of the plunger cylinder 22 in the casing body 31, and the discharge valve 25 is positioned in contact with the upper surface of the intake valve 24 in the casing body 31. At this time, the plunger cylinder 22, the suction valve 24, and the discharge valve 25 are radially positioned by the outer peripheral surfaces thereof being supported by the inner peripheral surface of the housing main body 31. The fitting portion 37 of the pressing member 33 is fitted into the housing main body 31, and the pressing member 33 is fixed to the housing main body 31 by a plurality of fastening bolts 39 in a state where it presses the upper surface of the discharge valve 25.
Here, the operations of the fuel injection pump 12 and the fuel injection device 10 will be described.
As shown in fig. 1 and 4, in the fuel injection pump 12, when fuel at a predetermined pressure is supplied from the fuel supply passage 70 to the valve body 62 of the intake valve 24 through the fuel supply/discharge chamber 68 and the fuel intake passage 69 by the fuel supply device, the valve body 62 moves against the biasing force of the compression spring 63, and the fuel intake passage 69 communicates with the fuel compression chamber 67, so that the fuel in the fuel supply/discharge chamber 68 is sucked into the fuel compression chamber 67 from the fuel intake passage 69. In this state, the plunger 23 is moved in the second direction B by the accumulator control valve block 13 to pressurize the fuel in the fuel compression chamber 67, and when the fuel pressure exceeds a predetermined pressure, the valve body 82 of the discharge valve 25 is moved against the urging force of the compression spring 83, and the fuel passage 66 communicates with the fuel passage 84, so that the fuel in the fuel compression chamber 67 flows through the fuel passage 66 to the fuel passage 84, and is discharged to the outside through the fuel discharge passage 85. Then, the fuel injection valve 11 can inject fuel into the combustion chamber of the diesel engine.
As described above, the fuel injection pump of the present embodiment includes: a pump housing 21; a plunger cylinder 22 disposed in the pump housing 21; a plunger 23 supported to be movable in the axial direction in the plunger cylinder 22; an intake valve 24 that defines a fuel compression chamber 67 with the plunger cylinder 22 and the plunger 23, and that is capable of drawing fuel from the outside into the fuel compression chamber 67; and a discharge valve 25 capable of discharging the fuel in the fuel compression chamber 67 to the outside, the plunger cylinder 22, the suction valve 24, and the discharge valve 25 are disposed in a linear arrangement along the longitudinal direction in the pump housing 21, and the outer wall surfaces thereof are supported by the inner wall surface of the pump housing 21.
Therefore, since the plunger 22, the suction valve 24, and the discharge valve 25 are disposed in a linear arrangement in the pump housing 21 and the outer wall surface is supported by the pump housing 21, there is no need to support the suction valve 24 and the discharge valve 25 by the plunger 22 as in the conventional art, and the plunger 22 can be downsized and the pump housing 21 can be downsized. As a result, the fuel injection pump 12 can be reduced in diameter and size as a whole.
In the fuel injection pump of the present embodiment, the plunger 23 is urged and supported in the first direction a away from the fuel compression chamber 67 by the return spring 51, the return spring 51 is a compression coil spring, one end portion of the return spring 51 is elastically pressed against the spring receiving portion 53 in the housing main body 31 of the pump housing 21, and the other end portion is elastically pressed against the spring receiving member 52 of the plunger 23. Therefore, the plunger 23 and the return spring 51 can be easily assembled to the pump housing 21, and the ease of assembling the plunger cylinder 22, the plunger 23, the return spring 51, and the like to the pump housing 21 can be improved. Further, since the spring receiving portion 53 is provided in the case main body 31, fastening means such as bolts for fixing the plunger cylinder 22 to the case main body 31 is not required, and the entire fuel injection pump 12 can be reduced in diameter and size.
In the fuel injection pump of the present embodiment, the movement of the plunger cylinder 22 in the first direction a is restricted by the protrusion 44 provided on the inner wall surface of the pump housing 21, and the suction valve 24 and the discharge valve 25 are compressed and held by the pressing member 33 in a state of being linearly closely arranged. Therefore, the plunger 22, the suction valve 24, and the discharge valve 25 are compressed and held in the pump housing 21, and no tensile stress acts on the plunger 22 and the like, so that the fatigue strength can be improved.
In the fuel injection pump of the present embodiment, the maximum outer diameter dimensions of the plunger cylinder 22, the intake valve 24, and the discharge valve 25 are set to the same dimensions. Therefore, the plunger cylinder 22, the suction valve 24, and the discharge valve 25 can be easily inserted into the pump housing 21, the inner diameter of the inner wall surface of the pump housing 21 supporting the plunger cylinder 22, the suction valve 24, and the discharge valve 25 can be set to the same size, the inner diameter processing of the pump housing 21 can be simplified, the processing cost can be reduced, the plunger cylinder 22, the suction valve 24, and the discharge valve 25 can be easily fixed in the pump housing 21, and the assembling property can be improved.
In the fuel injection pump of the present embodiment, by providing the small diameter portion of the suction valve 24 having an outer diameter smaller than the inner diameter of the pump housing 21, the fuel supply/discharge chamber 68 is formed between the small diameter portion 64 and the pump housing 21, and the fuel supply/discharge chamber 68 communicates with the fuel compression chamber 67 via the fuel suction passage 69. Therefore, by forming the fuel supply/discharge chamber 68 by providing the small diameter portion 64 in the intake valve 24, it is possible to reduce the processing cost without processing a concave portion of the inner wall surface of the pump housing 21, and to reduce the thickness of the pump housing 21, and to reduce the diameter of the entire fuel injection pump 12.
Further, the fuel injection device of the present embodiment includes: a fuel injection valve 11 that injects fuel into a combustion chamber of the diesel engine; a fuel injection pump 12 that supplies fuel to the fuel injection valve 11; and a rail control valve block 13 that controls the operation of the plunger 23 in the fuel injection pump 12. Therefore, the fuel injection device 10 can be made smaller and lighter by making the entire fuel injection pump 12 smaller in diameter and smaller in size.
Further, since the internal combustion engine of the present embodiment includes the fuel injection device 10, the fuel injection pump 12 as a whole is reduced in diameter and size, and the diesel engine can be reduced in size and weight.
Description of the symbols
10 fuel injection device
11 fuel injection valve
12 fuel injection pump
13 accumulating pipe control valve block
21 Pump housing
22 plunger cylinder
23 plunger
24 suction valve
25 discharge valve
31 main body of the shell
32 casing mounting table
33 pressing member
43. 45 inclined plane
44 projection
51 return spring
52 spring receiving member
53 spring receiving part
61 suction valve body
62 valve core
63 compression spring
66 fuel passages
67 fuel compression chamber
68 fuel supply and exhaust chamber
69 fuel intake passage
70 fuel supply path
71 fuel discharge path
81 discharge valve body
82 spool
83 compression spring
84 fuel path
85 fuel discharge path
Claims (4)
1. A fuel injection pump is characterized by comprising:
a pump housing;
a plunger cylinder disposed within the pump housing;
a plunger supported to be movable in an axial direction in the plunger cylinder;
a suction valve that defines a fuel compression chamber with the plunger cylinder and the plunger, and that can suck fuel from outside into the fuel compression chamber; and the number of the first and second groups,
a discharge valve capable of discharging the fuel of the fuel compression chamber to the outside,
the inner diameter of the inner wall surface of the pump housing at the portion supporting the plunger cylinder, the suction valve, and the discharge valve is set to the same size,
the plunger barrel and the suction valve are arranged linearly in the pump housing along the longitudinal direction, and outer wall surfaces of the plunger barrel and the suction valve are supported by an inner wall surface of the pump housing,
the plunger is urged and supported in a first direction away from the fuel compression chamber by a return spring, the return spring being a compression coil spring disposed between the pump housing and the plunger, one end portion of the return spring being elastically pressed against a spring receiving portion in the pump housing, and the other end portion of the return spring being elastically pressed against a spring receiving member of the plunger,
the movement of the plunger barrel in the first direction is restricted by a stopper provided on an inner wall surface of the pump housing, and the suction valve and the discharge valve are compressed and held by a pressing member in a state of being linearly arranged in close contact with each other,
the maximum outer diameter dimensions of the plunger cylinder, the suction valve, and the discharge valve are set to the same dimensions.
2. The fuel injection pump of claim 1,
the suction valve is provided with a small diameter portion having an outer diameter smaller than an inner diameter of the pump housing, so that a fuel supply and discharge chamber is formed between the small diameter portion and the pump housing, the fuel supply and discharge chamber communicating with the fuel compression chamber via a fuel suction passage.
3. A fuel injection apparatus, characterized by comprising:
a fuel injection valve that injects fuel into a combustion chamber of an internal combustion engine;
the fuel injection pump according to claim 1 or 2 that supplies fuel to the fuel injection valve; and
and a pressure accumulation control valve device that controls the operation of the plunger in the fuel injection pump.
4. An internal combustion engine, characterized in that,
a fuel injection device according to claim 3 is provided.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-154316 | 2015-08-04 | ||
| JP2015154316A JP6546807B2 (en) | 2015-08-04 | 2015-08-04 | Fuel injection pump, fuel injection device, internal combustion engine |
| PCT/JP2016/071227 WO2017022482A1 (en) | 2015-08-04 | 2016-07-20 | Fuel injection pump, fuel injection device, internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107850026A CN107850026A (en) | 2018-03-27 |
| CN107850026B true CN107850026B (en) | 2020-04-14 |
Family
ID=57942877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680018967.XA Active CN107850026B (en) | 2015-08-04 | 2016-07-20 | Fuel injection pump, fuel injection device, and internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6546807B2 (en) |
| KR (1) | KR102058785B1 (en) |
| CN (1) | CN107850026B (en) |
| WO (1) | WO2017022482A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6568613B1 (en) | 2018-03-09 | 2019-08-28 | 株式会社ジャパンエンジンコーポレーション | Water injection pump |
| JP7190860B2 (en) * | 2018-10-05 | 2022-12-16 | 株式会社ジャパンエンジンコーポレーション | Water injection pump |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03168355A (en) * | 1989-11-29 | 1991-07-22 | Zexel Corp | Fuel injection pump |
| JP3309765B2 (en) * | 1997-05-16 | 2002-07-29 | 三菱電機株式会社 | High pressure fuel supply pump |
| JP2003097386A (en) * | 2001-09-27 | 2003-04-03 | Mitsubishi Electric Corp | High-pressure fuel feeder |
| JP5255400B2 (en) * | 2008-10-27 | 2013-08-07 | ヤンマー株式会社 | Fuel injection pump |
| JP2010275874A (en) * | 2009-05-26 | 2010-12-09 | Denso Corp | Fuel injection pump |
| IT1396143B1 (en) * | 2009-11-03 | 2012-11-16 | Magneti Marelli Spa | FUEL PUMP WITH REDUCED WEAR ON A GASKET FOR A DIRECT INJECTION SYSTEM |
| JP2013133782A (en) * | 2011-12-27 | 2013-07-08 | Mitsubishi Heavy Ind Ltd | Fuel injection device for diesel engine, diesel engine with the same, and ship |
| JP5519857B1 (en) * | 2013-12-26 | 2014-06-11 | 三井造船株式会社 | Low-temperature liquefied gas suction / discharge valve body, reciprocating pump, and fuel gas supply device |
-
2015
- 2015-08-04 JP JP2015154316A patent/JP6546807B2/en active Active
-
2016
- 2016-07-20 KR KR1020177026087A patent/KR102058785B1/en active IP Right Grant
- 2016-07-20 CN CN201680018967.XA patent/CN107850026B/en active Active
- 2016-07-20 WO PCT/JP2016/071227 patent/WO2017022482A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017031918A (en) | 2017-02-09 |
| KR102058785B1 (en) | 2019-12-23 |
| JP6546807B2 (en) | 2019-07-17 |
| WO2017022482A1 (en) | 2017-02-09 |
| CN107850026A (en) | 2018-03-27 |
| KR20170118179A (en) | 2017-10-24 |
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