JP4453015B2 - High pressure fuel pump - Google Patents

Description

  The present invention relates to a high-pressure fuel pump that pressurizes and discharges fuel sucked from a suction chamber into a pressurization chamber by reciprocating movement of a plunger.

  A high-pressure fuel pump that pressurizes and discharges fuel sucked from a suction chamber into a pressurization chamber by a reciprocating movement of a plunger is known (for example, see Patent Document 1). In such a high-pressure fuel pump, various pump components such as a fuel inlet, a metering valve, and a discharge valve are assembled in a pump housing.

JP 2003-254191 A

However, depending on the position where the component parts are installed in the pump housing, the component parts may protrude greatly outward in the radial direction or axial direction of the high-pressure fuel pump. When the component parts protrude greatly, there is a problem that the high-pressure fuel pump becomes large. In addition, if the component part protrudes greatly outside the high-pressure fuel pump, the protruding part interferes with peripheral parts when the high-pressure fuel pump is mounted, making it difficult to mount the high-pressure fuel pump.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a high-pressure fuel pump that is small and easy to mount.

According to the present invention 1 and 2, wherein the outer peripheral edge of the suction chamber has a discontinuous discontinuous portion protruding to the inner peripheral side from the arcuate portion and arcuate portion, the discontinuous portion and a discontinuous At least one component of the high-pressure fuel pump is installed in the remaining space of the pump housing formed between the outer periphery of the pump housing and the outer periphery of the pump housing. Here, the discontinuous portion of the outer peripheral edge is the other part of the outer peripheral edge located on the inner peripheral side of the extended portion with respect to the extended portion obtained by extending a part of the outer peripheral edge in the circumferential direction. For example, when a part of the outer peripheral edge is arc-shaped, and the other part of the outer peripheral edge is positioned on the inner peripheral side with respect to the arc-shaped extension obtained by extending the arc part in the circumferential direction, The other part is a discontinuous part. In this case, the other part of the outer peripheral edge part may have an arc shape, a straight line shape, or a concave shape on the inner peripheral side with a smaller curvature than a part of the outer peripheral edge part.

According to a third aspect of the present invention, the suction chamber has a concave portion recessed on the inner peripheral side, and the remaining space of the pump housing formed between the concave portion and the outer periphery of the pump housing located on the outer peripheral side from the concave portion. At least one component of the high-pressure fuel pump is installed. The formation position of the recess may be either above or below the suction chamber.
According to a fourth aspect of the present invention, the outer peripheral edge portion of the suction chamber has a straight portion in the circumferential direction and an arc-shaped portion in a portion excluding the straight portion, and the pump located on the outer peripheral side from the straight portion and the straight portion. At least one component of the high-pressure fuel pump is installed in the remaining space of the pump housing formed between the outer periphery of the housing.

  As described above, in the first to fourth aspects of the invention, since at least one component of the high-pressure fuel pump is installed in the remaining space of the pump housing, the component installed in the remaining space is located outside the high-pressure fuel pump. It is possible to reduce the amount of protrusion that protrudes. Thereby, a high pressure fuel pump can be reduced in size. Furthermore, since the amount of protrusion of the component parts protruding toward the outside of the high-pressure fuel pump can be reduced, interference with peripheral parts can be avoided as much as possible when the high-pressure fuel pump is mounted. Therefore, it is easy to mount the high-pressure fuel pump.

  According to the fifth aspect of the present invention, the suction chamber is formed so as to extend outward in the radial direction of the pressurization chamber on the side opposite to the plunger with respect to the pressurization chamber. A space is formed on the pressure chamber side of the suction chamber. If a component is installed in this space, the amount of protrusion of the component toward the outside of the high-pressure fuel pump can be reduced, and the high-pressure fuel pump can be downsized.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a remaining space is formed on the pressure chamber side of the suction chamber, that is, on one axial direction side of the high-pressure fuel pump, and components are installed in the remaining space. . Thereby, it is possible to reduce the amount of protrusion, in particular, where the component protrudes outward in the radial direction of the high-pressure fuel pump.

  By the way, the metering valve for metering the fuel discharge amount requires a large installation space among the components. Therefore, according to the seventh aspect of the present invention, the metering valve is installed in the remaining space. According to this configuration, it is possible to reduce the protrusion amount that the metering valve that requires a large installation space protrudes toward the outside of the high-pressure fuel pump.

  According to the invention of claim 8, the valve member of the metering valve is installed in the remaining space, and the coil is installed on the outer peripheral side of the pressurizing chamber opposite to the suction chamber with respect to the valve member. According to this configuration, the coil of the metering valve that requires a large installation space can be installed in the space on the outer peripheral side of the pressurizing chamber. Therefore, it is possible to reduce the amount of protrusion that the metering valve protrudes toward the outside of the high-pressure fuel pump.

  According to the ninth aspect of the present invention, since the relief valve is installed in the remaining space, it is possible to reduce the amount of protrusion that the relief valve projects toward the outside of the high-pressure fuel pump. Furthermore, since the relief valve is installed in the remaining space, the relief valve can be installed close to the suction chamber. As a result, in order to regulate the pressure on the downstream side of the fuel discharge section, the length of the discharge passage for discharging high-pressure fuel from the relief valve to the low-pressure side suction chamber is shortened. Therefore, it is easy to form the discharge passage.

According to the tenth aspect of the present invention, since the fuel inlet and the fuel discharger can be installed in the space formed on the pressure chamber side of the suction chamber, the fuel inlet and the fuel discharger face the outside of the high-pressure fuel pump. The amount of protrusion protruding can be reduced.
According to the eleventh aspect of the present invention, since the relief valve can be installed in a space formed in the circumferential direction between the fuel inlet portion and the fuel discharge portion, the protruding amount by which the relief valve projects toward the outside of the high-pressure fuel pump. Can be reduced. Furthermore, it is not necessary to newly provide a space for installing the relief valve in the housing body. Therefore, the high-pressure fuel pump can be reduced in size.

  According to the twelfth aspect of the present invention, the metering valve is installed on the opposite side of the fuel inlet portion, the fuel discharge portion and the relief valve with respect to the virtual plane including the central axis of the plunger. According to this configuration, a large installation space can be secured without increasing the size of the high-pressure fuel pump because of the metering valve that requires a large installation space among the components.

A plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A high-pressure fuel pump according to a first embodiment of the present invention is shown in FIGS. The high-pressure fuel pump 10 is, for example, a fuel pump that supplies fuel to an injector of a diesel engine or a gasoline engine.
The high-pressure fuel pump 10 includes a housing body 12, a housing cover 16, a plunger 20, a pipe joint 30, a metering valve 40, a discharge valve 60, a relief valve 70, and the like.

  The housing body 12 and the housing cover 16 constitute a pump housing. The housing body 12 is made of martensitic stainless steel or the like. The cylinder 14 that supports the plunger 20 so as to be reciprocally movable is formed by curing the housing body 12 that slides with the plunger 20 by induction hardening. The housing body 12 is formed with an introduction passage 102, a suction passage 118, a pressurizing chamber 120, a relief passage 122, a discharge passage 130, and a discharge passage 134. The suction chamber 110 is formed between the housing body 12 and the housing cover 16.

  The suction chamber 110 is formed on the side opposite to the axial direction of the plunger 20 with respect to the pressurizing chamber 120, and extends outward in the radial direction of the pressurizing chamber 120. The outer peripheral edge 112 of the suction chamber 110 on the side opposite to the pressurizing chamber 120 is substantially circular, and concave portions 115 are formed on both radial sides of the outer peripheral edge 114 of the suction chamber 110 on the pressurizing chamber 120 side ( (See FIG. 2). The outer peripheral edge portion 114 excluding the concave portion 115 has an arc shape, and the concave portion 115 is located on the inner peripheral side with respect to an arc portion obtained by extending a part of the outer peripheral edge portion 114 excluding the concave portion 115 in the circumferential direction. That is, the concave portion 115 forms a discontinuous portion with respect to a part of the arc-shaped outer peripheral edge portion 114. Further, a recess 116 is formed by providing a step 116 in the axial direction of the suction chamber 110. Due to the recess 115 and the step 116, the suction chamber 110 is formed with a recess recessed inward when viewed as the entire suction chamber 110.

  A remaining space 200 of the housing body 12 is formed on the outer peripheral side of the recess 115. The metering valve 40 and the relief valve 70 are installed in the remaining space 200 of the housing body 12. The pipe joint 30 as a fuel inlet and the discharge valve 60 as a fuel discharge part are installed in the space of the housing body 12 formed on the outer peripheral side of the pressurizing chamber 120 on the pressurizing chamber 120 side of the suction chamber 110. ing. The relief valve 70 is installed in a space formed by the pipe joint 30 and the discharge valve 60 in the circumferential direction. As shown in FIGS. 2 and 3, the pipe joint 30, the discharge valve 60, and the relief valve 70 are installed on the opposite side of the metering valve 40 with respect to the virtual plane 210 including the central axis of the plunger 20.

Next, components of the high pressure fuel pump 10 installed and assembled in the housing body 12 will be described.
As shown in FIG. 1, the plunger 20 is supported by the cylinder 14 of the housing body 12 so as to be reciprocally movable. The pressurizing chamber 120 is formed on one end side of the plunger 20 in the reciprocating direction. A head 22 formed on the other end side of the plunger 20 is coupled to a spring seat 24. A spring 26 is interposed between the spring seat 24 and the housing body 12. The spring seat 24 is pressed against the inner wall of the bottom of the tappet (not shown) by the urging force of the spring 26. The plunger 20 reciprocates as the bottom outer wall of the tappet slides with the cam by rotation of the cam (not shown). An oil seal 28 seals between the outer peripheral surface of the plunger 20 on the head 22 side and the inner peripheral surface of the housing body 12 that houses the plunger 20. The oil seal 28 prevents oil from entering the pressurizing chamber 120 from the engine and prevents fuel leakage from the pressurizing chamber 120 into the engine. The fuel leaked from the sliding portion between the plunger 20 and the cylinder 14 to the oil seal 28 side is returned from the escape passage 122 to the introduction passage 102 on the low pressure side. This prevents a high fuel pressure from being applied to the oil seal 28.

  The pipe joint 30 is assembled in the introduction passage 102 by screwing the body 32 of the pipe joint 30 and the housing body 12 together. A fuel passage 100 communicating with the introduction passage 102 is formed in the body 32 of the pipe joint 30, and a fuel filter 34 is installed in the fuel passage 100.

  The metering valve 40 includes a valve member 42, a guide 44, a spring 46, a valve seat member 48, an electromagnetic drive unit 50, and the like. The valve member 42 is formed in a cup shape, for example, by coating the surface of a magnetic material or a magnetic material with a non-magnetic material, and is guided by a guide 44 so as to be reciprocally movable. The spring 46 biases the valve member 42 toward the valve seat member 48 installed on the suction chamber 110 side of the valve member 42. When the valve member 42 is seated on the valve seat member 48, the communication between the suction chamber 110 and the suction passage 118 is blocked.

  The electromagnetic drive part 50 of the metering valve 40 is formed by insert molding a central core 54 and a coil 56 in a resin part 52. The central core 54 and a part of the coil 56 are fitted in the recess 18 of the housing body 12 provided on the outer peripheral side of the pressurizing chamber 120 opposite to the suction chamber 110 with respect to the valve member 42. When energization of the coil 56 is turned on, a magnetic attraction force acts between the valve body 42 and the housing body 12 opposite to the valve seat member 48 with respect to the valve member 42.

  As shown in FIG. 3, the discharge valve 60 is assembled in the discharge passage 130 by screwing the body 62 of the discharge valve 60 and the housing body 12 together. A fuel passage 132 is formed in the body 62 of the discharge valve 60, and a valve member 64, a spring 66, and a valve seat member 68 are accommodated in the fuel passage 132. The valve seat member 68 is installed on the pressure chamber 120 side with respect to the valve member 64, and the spring 66 biases the valve member 64 toward the valve seat member 68. When the fuel pressure in the pressurizing chamber 120 exceeds a predetermined pressure, the valve member 64 is separated from the valve seat member 68 against the biasing force of the spring 66. As a result, the fuel in the pressurizing chamber 120 is discharged from the high-pressure fuel pump 10 through the discharge passage 130 and the fuel passage 132. The fuel discharged from the high-pressure fuel pump 10 is supplied to a fuel rail (not shown) and stored. The fuel accumulated in the fuel rail is supplied to the injector.

  As shown in FIGS. 2 and 3, the relief valve 70 is installed in a space that includes the remaining space 200 and is formed between the pipe joint 30 and the discharge valve 60 in the circumferential direction. Thereby, the relief valve 70 is entirely accommodated in the housing body 12. Also, as shown in FIG. 4, the relief valve 70 is assembled to the housing body 12 by sandwiching the valve seat member 78 between the body 72 of the relief valve 70 and the housing body 12 and screwing it to the housing body 12. It has been. The ball 74 and the spring seat 75 constitute a valve member of the relief valve 70. The spring 76 biases the spring seat 75 and the ball 74 toward the valve seat member 78. The discharge passage 134 communicates with the downstream side of the valve member 64 of the discharge valve 60, and the fuel pressure in the discharge passage 134 acts in a direction in which the ball 74 is separated from the valve seat member 78. When the pressure on the downstream side of the valve member 64 becomes equal to or higher than a predetermined pressure, the ball 74 separates from the valve seat member 78 against the biasing force of the spring 76 and the fuel is discharged from the discharge passage 134 to the suction chamber 110. The valve opening pressure of the relief valve 70 is set higher than the valve opening pressure of the discharge valve 60.

Next, the operation of the high pressure fuel pump 10 will be described.
(1) Suction stroke When the plunger 20 descends and the pressure in the pressurizing chamber 120 decreases, the differential pressure that the valve member 42 receives from the suction chamber 110 on the upstream side of the valve member 42 and the pressurizing chamber 120 on the downstream side. Changes. The sum of the force received in the direction in which the valve member 42 is seated on the valve seat member 48 due to the fuel pressure in the pressurizing chamber 120 and the biasing force of the spring 46 is determined by the fuel pressure on the suction chamber 110 side. When it becomes smaller than the force received in the direction of separating from the member 48, the valve member 42 is separated from the valve seat member 48 and is locked to the housing body 12 on the opposite side of the valve seat member 48 from the valve member 42. As a result, fuel is sucked into the pressurizing chamber 120 from the suction chamber 110 through the suction passage 118.

  Then, energization of the coil 56 is turned on in a state where the valve member 42 and the housing body 12 before the plunger 20 reaches the bottom dead center are in contact with each other. Since the valve member 42 and the housing main body 12 are in contact with each other, the magnetic attraction force necessary for maintaining the valve-opening state of the metering valve 40 with the valve member 42 locked on the housing main body 12 may be small.

(2) Return stroke Even if the plunger 20 rises from the bottom dead center toward the top dead center, the energization to the coil 56 is in the on state, and the magnetic attractive force is generated between the housing body 12 and the valve member 42. Therefore, the valve member 42 is held in the valve open position locked to the housing main body 12. As a result, the fuel in the pressurizing chamber 120 pressurized by the rise of the plunger 20 passes through the suction passage 118 and is returned from the metering valve 40 to the suction chamber 110.

(3) Pressurization stroke When the energization of the coil 56 is turned off during the return stroke, the magnetic attractive force does not act between the valve member 42 and the housing body 12. As a result, the sum of the force received in the direction in which the valve member 42 is seated on the valve seat member 48 due to the fuel pressure in the pressurizing chamber 120 and the biasing force of the spring 46 is determined by the fuel pressure on the suction chamber 110 side. It becomes larger than the force received in the direction of separating from the seat member 48. As a result, the valve member 42 is seated on the valve seat member 48 due to the differential pressure, and the communication between the suction chamber 110 and the suction passage 118 is blocked. When the plunger 20 further rises toward the top dead center in this state, the fuel in the pressurizing chamber 120 is pressurized and the fuel pressure rises. When the fuel pressure in the pressurizing chamber 120 becomes equal to or higher than a predetermined pressure, the valve member 64 is separated from the valve seat member 68 against the biasing force of the spring 66 of the discharge valve 60, and the discharge valve 60 is opened. Thereby, the fuel pressurized in the pressurizing chamber 120 passes through the discharge passage 130 and is discharged from the discharge valve 60. The fuel discharged from the discharge valve 60 is supplied to a fuel rail (not shown), accumulated, and supplied to the injector. When the pressure of the fuel accumulated in the fuel rail becomes equal to or higher than a predetermined pressure, the ball 74 is separated from the valve seat member 78, and thus passes through the fuel passage 132 and the discharge passage 134 of the discharge valve 60 and passes from the relief valve 70 to the suction chamber 110. The fuel is discharged.
By repeating the steps (1) to (3), the high-pressure fuel pump 10 pressurizes and discharges the sucked fuel. The fuel discharge amount is adjusted by controlling the energization timing to the coil 56 of the metering valve 40.

  In the first embodiment described above, the valve member 42 of the metering valve 40 is installed in the remaining space 200 formed in the housing main body 12 by denting the pressurizing chamber 120 side of the suction chamber 110. In addition, the coil 56 of the metering valve 40 is installed in a space opposite to the suction chamber 110 with respect to the valve member 42, that is, on the outer peripheral side of the pressurizing chamber 120. Accordingly, the metering valve 40 having the electromagnetic drive unit 50 and having a large installation space can be installed in the housing body 12 by effectively using the space of the housing body 12.

  Further, a housing body in which a pipe joint 30 and a discharge valve 60 are installed around the pressurization chamber 120 on the pressure chamber 120 side of the suction chamber 110 and is formed between the pipe joint 30 and the discharge valve 60 in the circumferential direction. Relief valves 70 are installed in 12 spaces. Furthermore, the relief valve 70 is installed in the remaining space 200 on the opposite side to the metering valve 40 in the radial direction.

  Further, the pipe joint 30, the discharge valve 60 and the relief valve 70 are installed on one side of the virtual plane 210 with respect to the virtual plane 210 including the central axis of the plunger 20. The metering valve 40 is installed on the opposite side of the valve 60 and the relief valve 70. That is, the piping joint 30, the discharge valve 60, and the relief valve 70 that are relatively simple in structure and have a smaller installation space than the metering valve 40 are collectively installed on one side of the virtual plane 210, and the electromagnetic wave is installed on the opposite side. The metering valve 40 which has the drive part 50 and requires a large installation space is installed.

As described above, the installation structure of the component that effectively uses the space of the housing main body 12 reduces the protrusion amount of the component protruding to the outside of the high-pressure fuel pump 10 as much as possible. As a result, the high-pressure fuel pump 10 becomes smaller.
Further, a metering valve 40 for intermittently connecting the suction chamber 110 and the pressurizing chamber 120, and a relief valve 70 for discharging fuel to the suction chamber 110 for regulating the fuel pressure downstream of the discharge valve 60, It is installed in the remaining space 200 near the suction chamber 110. As a result, the length of the fuel passage connecting the metering valve 40 and the relief valve 70 and the suction chamber 110 is shortened or unnecessary, so that the fuel passage can be easily formed.
Moreover, since the protrusion amount which a component protrudes outside the high pressure fuel pump 10 reduces, when mounting the high pressure fuel pump 10, it can avoid that a protrusion location interferes with a peripheral component as much as possible. Therefore, the high-pressure fuel pump 10 can be easily mounted.

(Second and third embodiments)
A second embodiment of the present invention is shown in FIG. 5 and a third embodiment is shown in the head 6. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment, and description is abbreviate | omitted.
In the second embodiment shown in FIG. 5, one straight portion 117 is formed as a discontinuous portion on the outer peripheral edge portion 114 of the suction chamber 110, and the metering valve 40 is installed on the outer peripheral side of the straight portion 117.
In the third embodiment shown in FIG. 6, two straight portions 117 are formed as discontinuous portions on both radial sides of the outer peripheral edge portion 114 of the suction chamber 110, and the metering valve 40 and the relief are provided on the outer peripheral side of the straight portion 117. Each valve 70 is installed.

  In both the second embodiment and the third embodiment, the outer peripheral edge 114 excluding the straight line portion 117 has an arc shape, and a part of the outer peripheral edge 114 excluding the straight line portion 117 extends in the circumferential direction. The straight line portion 117 is located on the inner peripheral side. That is, the straight line portion 117 forms a discontinuous portion with respect to a part of the arc-shaped outer peripheral edge portion 114. Further, when viewed as the entire suction chamber 110, the straight portion 117 forms a concave portion recessed inward.

(Fourth embodiment)
A fourth embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the substantially same component as 1st Embodiment, and description is abbreviate | omitted.
The housing body 82, the cylinder 84, and the housing cover 16 constitute a pump housing, and are separate parts. The housing body 82 is made of ferritic stainless steel, and the cylinder 84 is made of martensitic stainless steel.

(Other embodiments)
In the above embodiments, the metering valve 40 or the metering valve 40 and the relief valve 70 are installed in the remaining space 200 formed in the housing body as components of the high-pressure fuel pump. 70, or instead of the metering valve 40 and the relief valve 70, as other components, for example, the pipe joint 30 and the discharge valve 60 may be installed in the remaining space 200.

  Further, in the plurality of embodiments, the concave portion 115 or the straight portion 117 is formed as a discontinuous portion or a concave portion when viewed as the whole suction chamber 110 in the outer peripheral edge portion 114 of the suction chamber 110 on the pressurizing chamber side, The remaining space 200 was formed in the housing main body on the outer peripheral side of the recess 115 or the linear portion 117. In addition to this, a recess 115 or a straight portion 117 is formed on the entire axial length of the suction chamber 110 opposite to the pressurizing chamber 120 or on the side of the suction chamber 110, and on the outer peripheral side of the recess 115 or the straight portion 117. A remaining space may be formed.

Further, a recess may be formed in either the vertical direction of the suction chamber, not on the side of the suction chamber, and a remaining space may be formed outside the recess. In addition, the shape of the discontinuous part of the outer peripheral edge of the suction chamber is an arc having a smaller curvature than a part of the outer peripheral edge of the arc shape when a part of the outer peripheral edge excluding the discontinuous part is an arc. There may be. That is, the discontinuous part should just be located in the inner peripheral side rather than the extension part which extended a part of outer peripheral part except the discontinuous part in the circumferential direction.
Alternatively, the entire circumference of the outer peripheral edge of the suction chamber may be formed as a straight portion, and the straight portion may be a discontinuous portion. In this case, the shape of the outer peripheral edge of the suction chamber is a polygon.

It is sectional drawing which shows the high pressure fuel pump by 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows the relief valve of a high pressure fuel pump. It is sectional drawing which shows the high pressure fuel pump by 2nd Embodiment of this invention in the same cross-sectional position as FIG. It is sectional drawing which shows the high pressure fuel pump by 3rd Embodiment of this invention in the same cross-sectional position as FIG. It is sectional drawing which shows the high pressure fuel pump by 4th Embodiment of this invention.

Explanation of symbols

10, 80 High pressure fuel pump, 12, 82 Housing body (pump housing), 14, 84 Cylinder (pump housing), 16 Housing cover (pump housing), 20 Plunger, 30 Piping joint (fuel inlet), 40 Metering valve , 42 Valve member, 50 Electromagnetic drive part, 56 Coil, 60 Discharge valve (fuel discharge part), 70 Relief valve, 110 Suction chamber, 112, 114 Outer peripheral edge part, 115 Recess (discontinuous part, recessed part), 116 Step ( (Recessed portion), 117 linear portion (discontinuous portion, recessed portion), 120 pressurizing chamber, 200 remaining space, 210 virtual plane

Claims (12)

A fuel inlet,
A pump housing having a suction chamber into which fuel is introduced from the fuel inlet, and a pressurizing chamber for sucking fuel from the suction chamber;
A fuel discharge section for discharging fuel pressurized in the pressurizing chamber;
A plunger that is reciprocally supported by the pump housing and pressurizes the fuel sucked into the pressurizing chamber;
A high pressure fuel pump comprising:
The outer peripheral edge of the suction chamber has an arc-shaped portion and a discontinuous discontinuous portion protruding from the arc-shaped portion to the inner peripheral side ,
A high-pressure fuel pump, wherein at least one component is installed in the remaining space of the pump housing formed between the discontinuous portion and the outer periphery of the pump housing located on the outer peripheral side of the discontinuous portion .   The high-pressure fuel pump according to claim 1, wherein the discontinuous portion is a straight portion formed at the outer peripheral edge portion. A fuel inlet,
A pump housing having a suction chamber into which fuel is introduced from the fuel inlet, and a pressurizing chamber for sucking fuel from the suction chamber;
A fuel discharge section for discharging fuel pressurized in the pressurizing chamber;
A plunger that is reciprocally supported by the pump housing and pressurizes the fuel sucked into the pressurizing chamber;
A high pressure fuel pump comprising:
The suction chamber has a recess recessed on the inner peripheral side,
A high-pressure fuel pump, wherein at least one component is installed in a remaining space of the pump housing formed between the recess and an outer periphery of the pump housing located on the outer peripheral side of the recess . A fuel inlet,
A pump housing having a suction chamber into which fuel is introduced from the fuel inlet, and a pressurizing chamber for sucking fuel from the suction chamber;
A fuel discharge section for discharging fuel pressurized in the pressurizing chamber;
A plunger that is reciprocally supported by the pump housing and pressurizes the fuel sucked into the pressurizing chamber;
A high pressure fuel pump comprising:
The outer peripheral edge of the suction chamber has a linear portion in the circumferential direction and an arc-shaped portion in a portion excluding the linear portion ,
The high-pressure fuel pump according to claim 1, wherein at least one component is installed in a remaining space of the pump housing formed between the linear portion and the outer periphery of the pump housing located on the outer peripheral side of the linear portion.   5. The high pressure according to claim 1, wherein the suction chamber is formed to extend radially outward of the pressurizing chamber on the opposite side to the plunger with respect to the pressurizing chamber. Fuel pump.   6. The high-pressure fuel pump according to claim 5, wherein the remaining space is formed on the pressure chamber side of the suction chamber.   The metering valve according to any one of claims 1 to 6, further comprising a metering valve installed in the remaining space by metering a fuel discharge amount by intermittently connecting the suction chamber and the pressurizing chamber. The high-pressure fuel pump described in the item.   The metering valve has a valve member that is intermittently connected to the suction chamber and the pressurizing chamber and is installed in the remaining space, and a coil that drives the valve member by magnetic attraction, and the valve member The high pressure fuel pump according to claim 7, wherein the coil is disposed on the outer peripheral side of the pressurizing chamber opposite to the suction chamber.   The high-pressure fuel pump according to any one of claims 1 to 8, further comprising a relief valve that regulates the pressure on the downstream side of the fuel discharge portion and is installed in the remaining space.   The high-pressure fuel pump according to claim 5 or 6, wherein the fuel inlet portion and the fuel discharge portion are disposed on the pressurizing chamber side of the suction chamber.   11. A relief valve for regulating the pressure on the downstream side of the fuel discharge part is further provided, and the relief valve is disposed between the fuel inlet part and the fuel discharge part in the circumferential direction. The high-pressure fuel pump described. A metering valve having a valve member for intermittently communicating between the suction chamber and the pressurizing chamber and metering the fuel discharge amount; and a coil for driving the valve member by a magnetic attraction force; 12. The high-pressure fuel pump according to claim 11, wherein the metering valve is installed on the opposite side of the fuel inlet portion, the fuel discharge portion, and the relief valve with respect to a virtual plane including an axis.

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