JP5699580B2 - Reed valve manufacturing method for fuel injection pump, reed valve for fuel injection pump, and fuel injection pump - Google Patents

Description

  The present invention relates to a fuel injection pump reed valve manufacturing method, a fuel injection pump reed valve, and a fuel injection pump technology.

  BACKGROUND ART A fuel injection pump is known as a pump used for injecting fuel in a diesel engine or the like. In addition, the reed valve is known as a valve having a tongue shape and configured to open and close by a pressure difference. Patent document 1 is disclosing the discharge valve (reed valve) provided in a gas compressor. A fuel injection pump reed valve is known as a reed valve used in a fuel injection pump. In Patent Document 2, the reed valve body on the suction side and the reed valve body on the discharge side are respectively formed on the same valve plate, and the suction side opened and closed by both reed valve bodies on a sheet sandwiching the valve plate from both sides, A reed valve for a fuel injection pump having a valve seat hole on the discharge side is disclosed.

  The reed valve for a fuel injection pump has poor sealing performance as compared with valves of other configurations when the differential pressure at the time of starting the fuel injection pump is small. The deterioration of the sealing performance causes the pump volume efficiency to deteriorate or the discharge failure at the time of low engine rotation. That is, in the fuel injection pump reed valve, the sealing performance is greatly related to the performance of the reed valve.

JP 2002-285964 A JP 2001-355542 A

  The problem to be solved by the present invention is to provide a fuel injection pump reed valve manufacturing method, a fuel injection pump reed valve, and a fuel injection pump that can improve sealing performance.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the seat and the reed valve main body are laminated, the valve seat and the valve seat hole are formed in the seat, and the reed valve main body includes an elastically deformable arm portion and A valve portion formed at one end of the arm portion, the valve portion comes into contact with the valve seat and closes the valve seat hole, and the valve portion is separated from the valve seat to be in the closed position. A method of manufacturing a reed valve for a fuel injection pump that is opened by opening a seat hole, wherein the seat and the reed valve main body are stacked, the valve seat is used as a base, and the valve portion is When pressure-molding toward the valve seat hole and pressure-molding the valve portion, the valve portion and the valve seat are co-processed so that the valve portion and the valve seat are in contact with each other. The contact surface is formed.

  In Claim 2, It is a manufacturing method of the reed valve for fuel injection pumps of Claim 1, Comprising: The said valve seat is made into a base, and the said reed-valve main body is made into the said valve seat hole by the cone-shaped stamping die. The reed valve body is molded by pressure molding.

According to a third aspect of the present invention, a seat and a reed valve main body are laminated, the valve seat and a valve seat hole are formed in the seat, and the reed valve main body includes an arm portion and the arm that are elastically deformed. A valve portion formed at one end of the valve portion, and the valve portion comes into contact with the valve seat and closes the valve seat hole so that the valve seat is separated from the valve seat and the valve seat hole A reed valve for a fuel injection pump that is opened by opening the valve, wherein a concave portion is formed on the opposite side of the valve portion from the side in contact with the seat, and the concave portion is formed in a conical shape. In the closed state of the reed valve, the valve portion and the valve seat are formed by co-processing and contact surfaces are formed to contact each other, and the conical surface of the recess is the contact between the valve portion and the valve seat. It is parallel to the surface.

According to a fourth aspect of the present invention, a seat and a reed valve main body are laminated, the valve seat and a valve seat hole are formed in the seat, and the reed valve main body includes an arm portion that elastically deforms and the arm. A valve portion formed at one end of the valve portion, and the valve portion comes into contact with the valve seat and closes the valve seat hole so that the valve seat is separated from the valve seat and the valve seat hole A fuel injection pump having a reed valve that is opened by opening the valve, wherein the valve portion and the valve seat are formed by co-processing and abutting surfaces that are in contact with each other are formed. In the closed state, the conical surface of the recess is parallel to the contact surfaces of the valve portion and the valve seat.

  According to the fuel injection pump reed valve manufacturing method, fuel injection pump reed valve, and fuel injection pump of the present invention, the sealing performance can be improved.

The schematic diagram which showed the structure of the fuel injection pump which concerns on embodiment of this invention. The perspective view which similarly showed the structure of the valve unit. The flowchart which showed the flow of the manufacturing method of the reed valve which is embodiment of this invention. Similarly, the flowchart which showed the flow of the manufacturing method of a reed valve as a schematic diagram. The schematic diagram which showed the effect | action of the reed valve. The schematic diagram which showed the structure of the reed valve which is another embodiment of this invention. The schematic diagram which similarly showed the effect | action of the reed valve.

A fuel injection pump 10 according to an embodiment of the present invention will be described with reference to FIG.
1 and 2, the suction passage 21 is indicated by a broken line, the discharge passage 22 is indicated by a solid line, and the relief passage 23 is indicated by a two-dot chain line.

  The fuel injection pump 10 includes a fuel injection pump main body 20, a valve unit 30, and an electromagnetic spill valve 40. The fuel injection pump body 20 includes a suction passage 21, a discharge passage 22, a relief passage 23, a fuel pressurizing chamber 25, a plunger 27, a drive cam 28, and a pump housing 15. The suction passage 21 is formed in the pump housing 15 as a fuel passage on the suction side. The discharge passage 22 is formed in the pump housing 15 as a fuel passage on the discharge side. The fuel pressurizing chamber 25 is formed in the pump housing 15 as an internal space communicating with the suction passage 21 and the discharge passage 22.

  The plunger 27 is accommodated in the pump housing 15 so as to slide in the axial direction and pressurize the fuel pressurizing chamber 25. The drive cam 28 is provided to drive the plunger 27. One end side of the rotation shaft portion 28A of the drive cam 28 protrudes to the outside of the pump housing 15, and is rotated by the power of the engine via a pulley.

  The valve unit 30 includes a suction reed valve 31 as a fuel injection pump reed valve, a discharge reed valve 32 as a fuel injection pump reed valve, and a relief reed valve 33 as a fuel injection pump reed valve. ing. A suction reed valve 31, a discharge reed valve 32, and a relief reed valve 33 are integrated with the valve unit 30. The valve unit 30 is disposed above the fuel pressurizing chamber 25. The detailed configuration of the valve unit 30 will be described later.

  The suction reed valve 31 is configured to be opened and closed by an electromagnetic spill valve 40. When the suction reed valve 31 is opened by the electromagnetic spill valve 40, fuel is sucked into the fuel pressurizing chamber 25 through the suction passage 21. Further, when the suction reed valve 31 is closed by the electromagnetic spill valve 40, when the lift amount of the plunger 27 is increased by the rotation of the drive cam 28, the fuel pressurizing chamber 25 is reduced in volume as the volume of the fuel pressurizing chamber 25 is reduced. The fuel in the pressure chamber 25 is pressurized to a fuel pressure that is sufficiently higher than the supply pressure level of the feed pump.

  In the closed state, the discharge reed valve 32 prevents the high-pressure fuel on the delivery pipe side from flowing back into the fuel pressurizing chamber 25 during suction. In the discharge reed valve 32, the fuel pressure in the fuel pressurizing chamber 25 becomes higher than the fuel pressure in the discharge passage 22 on the downstream side of the discharge reed valve 32, and the difference between the two pressures (front-rear differential pressure) is preset. When the differential pressure value is reached, the open state is established, and the high-pressure fuel in the fuel pressurizing chamber 25 is discharged to the delivery pipe connected to the discharge passage 22 on the downstream side.

  The relief reed valve 33 is opened when the pressure of the high-pressure fuel discharged from the fuel pressurizing chamber 25 to the delivery pipe reaches a preset upper limit pressure value, and surplus fuel passes through the relief passage 23 to the fuel tank. Let the side leak.

  The electromagnetic spill valve 40 will not be described in detail in this embodiment.

The valve unit 30 according to the embodiment of the present invention will be described with reference to FIG.
The valve unit 30 includes a suction reed valve 31, a discharge reed valve 32, and a relief reed valve 33 as a unit. The reed valve is a valve that is formed in a tongue shape and opens and closes due to a pressure difference.

  The suction reed valve 31 includes a reed valve main body 51 and a valve seat 61A. The closed state of the suction reed valve 31 is configured by contact between the reed valve main body 51 and the valve seat 61A. Similarly, the discharge reed valve 32 includes a reed valve main body 52 and a valve seat 72A. The closed state of the discharge reed valve 32 is configured by the reed valve main body 52 and the valve seat 62A contacting each other. Similarly, the relief reed valve 33 includes a reed valve main body 53 and a valve seat 63A. The closed state of the relief reed valve 33 is configured by contact between the reed valve main body 53 and the valve seat 63A.

  The valve unit 30 includes a valve plate 50, an upper seat plate 60 as a seat, and a lower seat plate 70 as a seat. The valve plate 50 is formed in a substantially disc shape and is housed in the pump housing 15. A reed valve main body 51, a reed valve main body 52, and a reed valve main body 53 are integrally formed on the valve plate 50.

  The reed valve main body 51 of the suction reed valve 31 is integrally formed with a valve portion 51A and an arm portion 51B. The arm portion 51 </ b> B is elastically deformed, the valve portion 51 </ b> A is formed at one end, and the other end is connected to the valve plate 50. Thus, the reed valve main body 51 is supported by the valve plate 50 at the other end of the arm portion 51B. Further, the valve portion 51 </ b> A is formed to have a large area so as to surround the valve seat hole 61.

  Since the reed valve main body 52 of the discharge reed valve 32 and the reed valve main body 53 of the relief reed valve 33 have the same configuration, the description thereof is omitted.

  The upper seat plate 60 is disposed adjacent to the upper surface side of the valve plate 50. In the upper seat plate 60, a valve seat hole 61, a valve seat 61A, a hole 62, a valve seat hole 63, and a valve seat 63A are integrally formed. The valve seat hole 61 is a part constituting a part of the suction passage 21. The valve seat 61 </ b> A is an edge around the valve seat hole 61 and is a portion with which the reed valve main body 51 abuts on the valve plate 50 side of the upper seat plate 60. The valve seat hole 63 is a part constituting a part of the relief passage 23. The valve seat 63 </ b> A is an edge around the valve seat hole 63 and is a portion with which the reed valve main body 53 abuts on the valve plate 50 side of the upper seat plate 60.

  The lower seat plate 70 is disposed adjacent to the lower surface side of the valve plate 50. The lower seat plate 70 is integrally formed with a hole 71, a valve seat hole 72, a valve seat 72A, and a hole 73. The hole 62 is a part constituting a part of the discharge passage 22. The valve seat hole 72 opens into the fuel pressurizing chamber 25, and the valve seat 72 </ b> A is an edge around the valve seat hole 72, and the reed valve main body 52 is located on the valve plate 50 side of the lower seat plate 70. It is the part that contacts.

  When the reed valve main body 51 of the suction reed valve 31 is open, the arm 51B is elastically deformed by the pressing action of the electromagnetic spill valve 40 against the valve 51A, and the valve 51A is separated from the valve seat 61A. In this state, the pressurizing chamber 25 is in communication. The closed state of the reed valve main body 51 is that the pressing action on the valve portion 51A of the electromagnetic spill valve 40 is released, and the pressure difference between the suction passage 21 and the fuel pressurization chamber 25 (pressure in the fuel pressurization chamber 25> suction passage). 21), the valve portion 51A comes into contact with the valve seat 61A, and the suction passage 21 and the fuel pressurizing chamber 25 are shut off.

  In the open state of the reed valve main body 52 of the discharge reed valve 32, the pressure difference between the discharge passage 22 and the fuel pressurizing chamber 25 (pressure in the fuel pressurizing chamber 25> pressure in the discharge passage 22) is the set differential pressure value. When the pressure is exceeded, the arm 52B is elastically deformed by the action of the pressure from the fuel pressurizing chamber 25 on the valve 52A, and the valve 52A is separated from the valve seat 72A. It is in a state of communication. When the reed valve main body 52 is closed, the valve portion 52A contacts the valve seat 72A due to a pressure difference between the discharge passage 22 and the fuel pressurization chamber 25 (pressure in the fuel pressurization chamber 25 <pressure in the discharge passage 22). The discharge passage 22 and the fuel pressurizing chamber 25 are in a state of being in contact with each other.

  When the reed valve body 53 of the relief reed valve 33 is open, when the high pressure fuel in the discharge passage 22 exceeds the set upper limit pressure, the arm portion 53B is elastically deformed by the action of the pressure of the high pressure fuel on the valve portion 53A. However, the valve portion 53A is separated from the valve seat hole 63, and the discharge passage 22 and the relief passage 23 are in communication with each other. When the reed valve main body 51 is closed, the valve portion 53A comes into contact with the valve seat hole 63 due to a pressure difference between the discharge passage 22 and the relief passage 23 (pressure in the discharge passage 22 <pressure in the relief passage 23). In this state, the passage 22 and the relief passage 23 are blocked.

A method for manufacturing the suction reed valve 31 according to the embodiment of the present invention will be described with reference to FIGS.
FIG. 3 shows the flow of each operation step (S110 to S140) for the method of manufacturing the suction reed valve 31.

  In step S110, when the molding of the suction reed valve 31 is started, the valve plate 50 and the upper sheet plate 60 are disk-shaped outer peripheries, for example, by precision press processing (or other processing methods such as electric discharge machining or wire cutting). It is assumed that it has been processed into a contour shape. As for the suction reed valve 31, the valve seat hole 61, the valve seat 61A, and the suction reed valve main body 51 are formed in separate steps.

  In step S120, the upper sheet plate 60 and the valve plate 50 are laminated. At this time, the upper seat plate 60 and the valve plate 50 are aligned with the center of the valve seat hole 61 of the upper seat plate 60 and the center of the valve portion 51A of the valve plate 50 so as to actually configure the valve unit 30. And are laminated.

  In step S130, the valve portion 51A is pressed by the press die 90. At this time, the press die 90 is formed in a columnar shape and has a tip formed in a conical shape. Further, when the valve portion 51A is pressed, the valve seat 61A is pressed as a pedestal. Here, the pedestal means a pedestal on which a workpiece to be processed is placed when pressing.

  In step S140, the molding of the suction reed valve 31 ends. The valve portion 51A of the suction reed valve 31 that has been molded is formed with a projection that is formed in a size corresponding to the valve seat hole 61 and protrudes toward the valve seat hole 61. Further, a conical recess 51P corresponding to the tip shape of the press die 90 is formed on the surface of the valve portion 51A where the protrusion is formed, on the side opposite to the upper sheet plate 60 side.

  The manufacturing method of the discharge reed valve 32 and the relief reed valve 33 is also the same as the manufacturing method of the suction reed valve 31, and the description thereof is omitted. Here, regarding the manufacturing method of the discharge reed valve 32, since the press working is performed toward the valve seat hole 72 of the lower seat plate 70, the suction reed valve 31 and the relief reed valve 33 have different press working directions. To do. That is, the press working of the suction reed valve 31 and the relief reed valve 33 is performed by pressing the valve plate 50 using the upper sheet plate 60 on which the valve seats 61A and 63a are formed as a pedestal. Processing is performed by pressing the valve plate 50 using the lower seat plate 70 on which the valve seat 72A is formed as a base.

  In addition, in embodiment of this invention, it was set as the manufacturing method which uses press molding as press molding, However, This invention is not limited to this. Any manufacturing method may be used as long as the valve portion 51A is pressurized to conform to the valve seat 61A.

The effect of the manufacturing method of the suction reed valve 31 will be described with reference to FIG.
5 shows the suction reed valve 31 in the closed state.
The suction reed valve 31 molded by the manufacturing method of the present invention can improve the sealing performance. That is, when the press working is performed, the valve seat 61A and the valve portion 51A are co-processed, so that the contact surface 61S is formed on the valve seat 61A, and the base end portion of the protrusion formed on the valve portion 51A is formed. A contact surface 51S is formed. Therefore, when the intake reed valve 31 is actually closed, that is, when the valve seat 61A and the valve portion 51A are in contact, the contact surface 61S and the contact surface 51S are in contact, and the valve seat 61A and the valve portion 51A are in contact. The sealing performance of the suction reed valve 31 can be improved.

  In other words, since the valve seat 61A and the valve portion 51A are co-processed during pressing, the contact surface 61S and the contact surface 51S that are parallel to each other at the contact point between the valve seat 61A and the valve portion 51A are formed. Formed by pressing, the contact area between the valve seat 61A and the valve portion 51A increases. Further, since the valve seat 61A and the valve portion 51A are co-processed, the surface roughness between the contact surface 61S and the contact surface 51S is reduced, so that the sealing performance in the closed state of the suction reed valve 31 can be improved. .

  Further, the suction reed valve 31 molded by the manufacturing method of the present invention is formed so that the conical surface of the recess 51P of the valve portion 51A is substantially parallel to the contact surface 61S and the contact surface 51S. Here, the differential pressure P between the suction passage 21 and the fuel pressurization chamber 25 (pressure in the fuel pressurization chamber 25> pressure in the suction passage 21) acts on the valve portion 51A, and comes into contact with the valve seat 61A. (Arrow P in FIG. 5). The pressing force P acts perpendicularly to the contact surface 61S and the contact surface 51S by the conical surface of the recess 51P of the valve portion 51A. Therefore, the contact surface 61S and the contact surface 51S are pressed with the maximum pressure. That is, the sealing performance of the suction reed valve 31 can be improved.

  The concave portion 51P in which the pressing force P acts perpendicularly to the contact surface 61S and the contact surface 51S is formed by, for example, pressing the tip-shaped press die 90 formed in a conical shape with an apex angle of about 90 °. And formed by pressing the valve portion 51A.

  The manufacturing method of the discharge reed valve 32 and the relief reed valve 33 molded by the manufacturing method of the present invention also exhibits the same effect as that of the manufacturing method of the suction reed valve 31, and the description thereof is omitted.

A suction reed valve 131 according to another embodiment of the present invention will be described with reference to FIG.
FIG. 6 shows the suction reed valve 131 before being assembled to the fuel injection pump.

  The intake reed valve 131 as a fuel injection pump reed valve is configured as a valve unit constituting the fuel injection pump. Since the fuel injection pump and the valve unit have the same configuration as the fuel injection pump 10 and the valve unit 30 described above, the description thereof is omitted.

  In the reed valve main body 151, a valve portion 151A and an arm portion 151B are integrally formed. In addition, about valve part 151A and arm part 151B, since it is the same structure as valve part 51A and arm part 51B mentioned above, description is abbreviate | omitted. A valve seat hole 161 and a valve seat 161A are integrally formed in the upper seat plate 160 as a seat. Since the valve seat hole 161 and the valve seat 161A have the same configuration as the valve seat hole 161 and the valve seat 161A described above, the description thereof is omitted.

  A concave portion 151P is formed on the opposite side of the valve portion 151A from the side in contact with the valve seat 161A. The recess 151P is formed in a conical shape. The center of the conical shape of the recess 151P is formed at a position corresponding to the center of the valve seat hole 161 in the valve portion 151A. It is assumed that the circular shape of the conical bottom surface forming the recess 151P is sufficiently smaller than the valve portion 151A.

The operation of the suction reed valve 131 according to another embodiment of the present invention will be described with reference to FIG.
FIG. 7 shows the suction reed valve 131 in the closed state.

  According to the suction reed valve 131 which is another embodiment of the present invention, the sealing performance can be improved. That is, in the closed state, the differential pressure between the valve seat hole 161 side (upstream side) and the suction hole side (downstream side) of the reed valve body 151 acts in the direction in which the reed valve body 151 contacts the valve seat 161A. At this time, since the valve portion 151A is pressed against the valve seat 161A, a contact surface 161S is formed on the valve seat 161A, and a contact surface 151S is formed on the valve portion 151A.

  In the suction reed valve 131, since the conical recess 151P is formed on the opposite side of the valve portion 151A from the side in contact with the valve seat 161A, the differential pressure between the upstream side and the downstream side causes the pressure difference between the valve seat 61A Acts perpendicularly to the surface 161S and the contact surface 151S of the valve portion 151A (arrow P in FIG. 7), and presses the contact surface 161S and the contact surface 151S with the maximum pressure, thus improving the sealing performance. it can. That is, the sealing performance of the suction reed valve 131 can be improved.

  In the suction reed valve 131 according to another embodiment of the present invention, the recess 151P may be formed so that the conical surface of the conical recess 151P is parallel to the contact surface 161S and the contact surface 151S. It is preferable for pressing the contact surface 161S and the contact surface 151S with the maximum pressure.

  Further, although the suction reed valve 131 has been described as another embodiment of the present invention, the same operation and effect can be obtained by adopting the same configuration for the discharge reed valve and the relief reed valve.

DESCRIPTION OF SYMBOLS 10 Fuel injection pump 31 Intake reed valve 50 Valve plate 51 Reed valve main body 51A Valve part 51B Arm part 60 Upper seat plate 61 Valve seat hole 61A Valve seat 70 Lower seat plate 71 Suction hole

Claims (4)

It is constructed by laminating a seat and a reed valve body,
The seat is formed with a valve seat and a valve seat hole,
The reed valve body is formed with an elastically deformable arm portion and a valve portion formed at one end of the arm portion,
The valve portion comes into contact with the valve seat and closes the valve seat hole, and the valve portion is separated from the valve seat and opened to open the valve seat hole.
A method for manufacturing a reed valve for a fuel injection pump, comprising:
Laminating the seat and the reed valve body,
Using the valve seat as a pedestal, pressurizing the valve portion toward the valve seat hole,
When pressure-molding the valve portion, the valve portion and the valve seat are co-processed to form contact surfaces that contact each other on the valve portion and the valve seat,
A method of manufacturing a reed valve for a fuel injection pump. A method for producing a reed valve for a fuel injection pump according to claim 1,
Using the valve seat as a pedestal, the reed valve body is pressure-molded toward the valve seat hole by a conical die at the tip,
Molding the reed valve body;
A method of manufacturing a reed valve for a fuel injection pump. It is constructed by laminating a seat and a reed valve body,
The seat is formed with a valve seat and a valve seat hole,
The reed valve body is formed with an elastically deformable arm portion and a valve portion formed at one end of the arm portion,
The valve portion comes into contact with the valve seat and closes the valve seat hole, and the valve portion is separated from the valve seat and opened to open the valve seat hole.
A reed valve for a fuel injection pump,
A concave portion is formed on the opposite side of the valve portion to the side in contact with the seat,
The recess is formed in a conical shape,
In the closed state of the reed valve,
The valve portion and the valve seat are formed by co-processing , and contact surfaces are formed to contact each other.
The conical surface of the recess is parallel to the contact surface of the valve portion and the valve seat,
Reed valve for fuel injection pump. It is constructed by laminating a seat and a reed valve body,
The seat is formed with a valve seat and a valve seat hole,
The reed valve body is formed with an elastically deformable arm portion and a valve portion formed at one end of the arm portion,
The valve portion comes into contact with the valve seat and closes the valve seat hole, and the valve portion is separated from the valve seat and opened to open the valve seat hole.
A fuel injection pump comprising a reed valve,
The valve portion and the valve seat are formed by co-processing , and contact surfaces are formed to contact each other.
In the closed state of the reed valve, the conical surface of the recess is parallel to the contact surface of the valve portion and the valve seat.
Fuel injection pump.

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