JP2012172537A - Fuel supply pump, and method of manufacturing fuel supply pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoe 32 that achieves weight reduction and cost reduction while satisfying the necessity of preventing a roller 41 from dropping off, in a tappet mechanism 7 of a fuel supply pump.SOLUTION: The shoe 32 projects partly to below the rotation axis of the roller 41 at both sides of a symmetrical face α to support the roller 41 at its underside. Because the roller 41 is prevented from dropping off by the part projecting to below the rotation axis, the part projecting to below the rotation axis and the part retreating to above the rotation axis are freely set with regard to the shape of the bottom end of the shoe 32, and thus weight reduction is achieved, as well as cost reduction is achieved since two pieces of materials 58a, 58b are obtained from one piece of raw material 57. Accordingly, weight reduction and cost reduction of the shoe 32 are achieved while satisfying the necessity of preventing the roller 41 from dropping off.

Description

  The present invention relates to a fuel supply pump that pressurizes and discharges fuel, and a method for manufacturing the fuel supply pump.

  2. Description of the Related Art Conventionally, as a fuel supply pump, one that sucks fuel and pressurizes and discharges the fuel to a high pressure exceeding 100 MPa is known. Applied to feeding equipment.

  This conventional fuel supply pump 100 is, for example, as shown in FIG. 6, a high-pressure pump that accommodates a plunger 102 in a cylinder 101 so as to be slidable in the vertical direction and forms a fuel pressurizing chamber 103. 104 and a tappet mechanism 106 that reciprocates the plunger 102 in the vertical direction by reciprocating linearly according to the rotation of the cam 105, and fuel is supplied to the pressurizing chamber 103 according to the reciprocation of the plunger 102. The fuel is supplied to the common rail by sucking in or discharging the fuel from the pressurizing chamber 103 (see, for example, Patent Document 1).

Further, the tappet mechanism 106 is provided in a columnar shape, and a roller 108 that contacts the outer periphery of the cam 105 and reciprocates in the vertical direction while rotating by the rotation of the cam 105, and the outer peripheral surface of the roller 108 are slidably held. And a shoe 109 that reciprocates in the vertical direction.
By the way, in the fuel supply pump 100, weight reduction and cost reduction for the shoe 109 are being studied as part of weight reduction and cost reduction.

Here, the shoe 109 holds the roller 108 below the rotational axis of the roller 108 because it is necessary to prevent the roller 108 from falling off.
The shoe 109 is provided by cutting a columnar material 111 as shown in FIG. 7, for example. In addition, the material 111 is provided with a cylindrical through hole 112 having an axis perpendicular to the cylinder axis, and the material 111 is rotated by 180 ° about the axis of the through hole 112 as a central axis. It has symmetry that overlaps the state before rotation.

  The material 111 is cut by forming the cut surface γ below the plane β that bisects the material 111 in order to prevent the roller 108 from falling off, and is obtained by cutting the material 111. Of the two portions 113a and 113b, only the larger portion 113a is used as the material of the shoe 109.

  As described above, the weight reduction and cost reduction of the shoe 109 are restricted to prevent the roller 108 from falling off, and a configuration of the shoe 109 that can achieve weight reduction and cost reduction while satisfying the necessity of preventing the roller 108 from falling off is required. ing.

JP 2010-037997 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to achieve weight reduction and cost reduction in a tappet mechanism of a fuel supply pump while satisfying the necessity of preventing the rollers from falling off. It is to provide a shoe that can.

[Means of Claim 1]
According to the first aspect of the present invention, the fuel supply pump accommodates the plunger in the cylinder so as to be slidable in the axial direction and accommodates the high pressure pump that forms the fuel pressurizing chamber and the rotation of the cam. And a tappet mechanism that reciprocates the plunger in the axial direction by reciprocating linearly. As a result, fuel is supplied to the internal combustion engine.

  Further, the tappet mechanism is provided in a columnar shape, and is a roller that reciprocates in the axial direction of the plunger while contacting the outer periphery of the cam and rotating by the rotation of the cam, and a plunger while holding the outer peripheral surface of the roller slidably. And a shoe that reciprocates in the axial direction. Then, the axial direction of the plunger is regarded as the vertical direction, the plunger is disposed on the upper side of the shoe and the cam is disposed on the lower side of the roller, and further includes the rotational axis of the roller in the vertical direction. If a parallel plane is defined as a symmetry plane, the shoe partially protrudes below the rotational axis of the roller on both sides of the symmetry plane to hold the roller on the lower side.

As a result, even if the lower edge of the shoe is partially retracted above the rotational axis of the roller, the roller can be prevented from falling off by the portion protruding downward from the rotational axis.
For this reason, with respect to the lower edge shape of the shoe, weight reduction can be achieved by freely setting a portion protruding downward from the rotation axis and a portion retracting upward. It is possible to obtain two materials from a single material, thereby achieving cost reduction.
As described above, in the tappet mechanism of the fuel supply pump, weight reduction and cost reduction of the shoe can be achieved while satisfying the necessity of preventing the roller from falling off.

[Means of claim 2]
According to the means of claim 2, the fuel supply pump manufacturing method includes a dividing step of dividing a cylindrical material into two materials, and using at least one of the two materials as a shoe material, An assembling process for assembling the tappet mechanism so that the cylindrical axis of the material obtained by the process is oriented in the vertical direction. And a division | segmentation process divides | segments a column-shaped raw material into two materials of the same shape which becomes symmetrical up and down, when it considers that the cylinder axis of a column-shaped raw material has faced the up-down direction.
Thereby, two shoes with the same performance can be obtained from one material.

[Means of claim 3]
According to the means of claim 3, in the dividing step, the dividing surface formed in one material is included in one plane, and the dividing surface formed in the other material is included in one plane. In this way, the cylindrical material is divided into two materials.
Thereby, two materials can be obtained by cutting a columnar material in one direction. For this reason, a division | segmentation process can be simplified.

It is a whole block diagram of a fuel supply pump (Example). (A) is side sectional drawing of a tappet mechanism, (b) is an internal front view of a tappet mechanism, (c) is an internal perspective view of a tappet mechanism (Example). (A) is a side view of a shoe, (b) is a front view of a shoe, (c) is a perspective view of a shoe (Example). (A) is a side view of a material showing a dividing step (before cutting), (b) is a front view of the material showing a dividing step (before cutting), and (c) shows a dividing step (after cutting). It is a side view of material, (d) is a front view of the material which shows a division process (after cutting), (e) is a side sectional view of a tappet mechanism which shows an assembly process, (f) is an assembly process. It is an internal front view of the tappet mechanism shown (Example). (A) is a side view of a material showing a dividing step (before cutting), (b) is a front view of the material showing a dividing step (before cutting), and (c) shows a dividing step (after cutting). It is a side view of material, (d) is a front view of the material which shows a division process (after cutting) (modification). It is a whole block diagram of a fuel supply pump (conventional example). (A) is a side view of the shoe material (before cutting), (b) is a front view of the shoe material (before cutting), and (c) is a side view of the shoe material (after cutting). (B) is a front view of the shoe material (after cutting) (conventional example).

  In the fuel supply pump of the embodiment, a plunger is supported in a cylinder so as to be slidable in the axial direction, and is reciprocated linearly according to rotation of a cam and a high-pressure pump forming a fuel pressurizing chamber. And a tappet mechanism for reciprocating the plunger in the axial direction. In response to the reciprocating movement of the plunger, the internal combustion engine is inhaled by discharging fuel into the pressurizing chamber or discharging fuel from the pressurizing chamber. Supply fuel.

  Further, the tappet mechanism is provided in a columnar shape, and is a roller that reciprocates in the axial direction of the plunger while contacting the outer periphery of the cam and rotating by rotation of the cam, and a plunger while holding the outer peripheral surface of the roller slidably. And a shoe that reciprocates in the axial direction. Then, the axial direction of the plunger is regarded as the vertical direction, the plunger is disposed on the upper side of the shoe and the cam is disposed on the lower side of the roller, and further includes the rotational axis of the roller in the vertical direction. If a parallel plane is defined as a symmetry plane, the shoe partially protrudes below the rotational axis of the roller on both sides of the symmetry plane to hold the roller on the lower side.

  Also, the fuel supply pump manufacturing method of the embodiment is obtained by dividing the columnar material into two materials, and dividing the at least one of the two materials into the shoe material, and the dividing step. An assembling step for assembling the tappet mechanism so that the cylindrical axis of the material is oriented in the vertical direction.

And a division | segmentation process divides | segments a column-shaped raw material into two materials of the same shape which becomes symmetrical up and down, when it considers that the cylinder axis of a column-shaped raw material has faced the up-down direction.
Further, the dividing step is a columnar material so that the dividing surface formed in one material is included in one plane and the dividing surface formed in the other material is included in one plane. Is divided into two materials.

[Configuration of Example]
The configuration of the fuel supply pump 1 according to the embodiment will be described with reference to FIG.
The fuel supply pump 1 pressurizes and discharges fuel to be injected and supplied to an internal combustion engine (not shown) of a vehicle, for example, and sucks fuel in a fuel tank having a pressure corresponding to atmospheric pressure and 100 MPa. Pressurize and discharge to a higher pressure. The operation of the fuel supply pump 1 is controlled by an electronic control unit (not shown: hereinafter referred to as ECU), and supplies high-pressure fuel to the internal combustion engine, for example, via a common rail.

  The fuel supply pump 1 accommodates the plunger 3 in the cylinder 2 so as to be slidable in the axial direction, and linearly according to the rotation of the cam 6 and the high pressure pump 5 that forms the fuel pressurizing chamber 4. A tappet mechanism 7 that reciprocates the plunger 3 in the axial direction by reciprocating is provided, and fuel is sucked into and discharged from the pressurization chamber 4 in accordance with the reciprocation of the plunger 3. In this way, the fuel is supplied to the internal combustion engine.

  In the following description, it is assumed that the axial direction of the plunger 3 is the vertical direction, the tappet mechanism 7 is disposed below the plunger 3, and the cam 6 is further disposed below the tappet mechanism 7.

  The fuel supply pump 1 includes an electromagnetic valve 9 for intermittently flowing the fuel into and from the pressurizing chamber 4. The ECU controls the energization of the solenoid coil 10 of the electromagnetic valve 9 to control the fuel supply pump 1. Control the behavior. The solenoid valve 9 includes fuel flow paths 11, 12, 14, 16, upstream of the pressurizing chamber 4 (that is, the fuel tank side) among the fuel flow paths 11 to 17 formed in the high-pressure pump 5. It is assembled to the high pressure pump 5 so as to open and close between the pressure chamber 17 and the pressurizing chamber 4.

  The high-pressure pump 5 includes a plunger 3 that is driven upward by the tappet mechanism 7, a cylinder body 19 that includes the cylinder 2 and supports the plunger 3 slidably in the vertical direction, and the plunger 3 and the tappet mechanism 7 on the lower side. And a discharge valve 21 that opens and closes between the flow passage on the discharge side (common rail side) of the fuel supply pump 1 and the pressurizing chamber 4.

  The plunger 3 is supported so that the lower end portion protrudes from the cylinder 2 and the upper end portion reciprocates within the cylinder 2. The pressurizing chamber 4 is formed by partitioning the upper end region of the cylinder 2 in a liquid-tight manner by the plunger 3 and expands or contracts according to the reciprocating motion of the plunger 3.

  The cylinder body 19 is provided with a concave shape on the upper side, and the concave portion is provided so as to gradually decrease in diameter toward the lower side. The upper end of the cylinder 2 (that is, the pressurizing chamber 4) is provided on the bottom surface on the lowermost side. The upper end of And the flow-path formation member 23 is arrange | positioned at the bottom part of a concave part so that the upper end opening of the pressurization chamber 4 may be sealed.

  Here, the flow path forming member 23 has a communication path 25 that communicates between the valve chamber 24 of the electromagnetic valve 9 and the pressurizing chamber 4. Further, the flow path forming member 23 functions as a seat portion on which the valve portion 26 of the electromagnetic valve 9 is separated and seated, a function as a stopper that restricts the downward movement of the valve portion 26, and the pressurizing chamber 4. It has a function to seal the fuel.

  A valve body 27 of the electromagnetic valve 9 is accommodated on the upper side of the flow path forming member 23 so as to contact the flow path forming member 23, and an annular fuel is interposed between the cylinder body 19 and the valve body 27. A flow path 11 is formed. In the cylinder body 19, a female screw that engages with a male screw of the electromagnetic valve 9 is provided on the inner periphery above the portion that forms the fuel flow path 11. The electromagnetic valve 9 is attached to the cylinder body 19. Screws are fastened.

  Further, the cylinder body 19 is provided with a fuel flow path 12 connected to the annular fuel flow path 11 and a fuel flow path 13 connecting the discharge valve 21 and the pressurizing chamber 4. Further, the upstream side of the fuel flow path 12 is connected to an annular fuel flow path 14 formed by the cylinder body 19 and the pump housing 29. A fuel introduction pipe 30 is attached to the pump housing 29 so that the fuel pumped from the fuel tank can be guided to the fuel flow path 14.

  The lower end of the spring 20 is supported by the tappet mechanism 7 via the lower sheet 31, and the upper end is supported by the upper sheet 33, so that upward extension is restricted. The spring 20 urges the plunger 3 downward so that the lower end portion of the plunger 3 (hereinafter referred to as the plunger head 34) always contacts the shoe 32. At the same time, the spring 20 urges the entire tappet mechanism 7 downward by urging the tappet body 35 described later via the lower seat 31 downward.

  The discharge valve 21 is accommodated in a valve holder 36 that is screwed to the cylinder body 19. The valve holder 36 is provided with a fuel flow path 15 connected to the downstream end of the fuel flow path 13, and the discharge valve 21 is accommodated in the fuel flow path 15. Here, the discharge valve 21 includes a valve body 37 that opens and closes the fuel flow path 15 and a spring 38 that biases the valve body 37 in a direction to close the fuel flow path 15. When the pressure exceeds a predetermined valve opening pressure, the valve is opened.

  The tappet mechanism 7 is accommodated in and supported by a cylindrical support hole 40, and reciprocates in the vertical direction. The tappet mechanism 7 is provided in a columnar shape and abuts on the outer periphery of the cam 6, and rotates by the rotation of the cam 6. The roller 41 reciprocates in the vertical direction, and the shoe 32 that is fixed in the tappet body 35 and reciprocates in the vertical direction, and holds the outer peripheral surface of the roller 41 slidably.

  Here, the inner periphery of the tappet body 35 is provided with a partition portion 43 extending radially inward, and the lower seat 31 is disposed above the partition portion 43, and the lower end of the spring 20 is supported via the lower seat 31. Has been. A shoe 32 and a roller 41 are accommodated below the partition 43, and the rotation axis of the roller 41 is perpendicular to the vertical direction.

  The roller 41 includes a large-diameter central portion 41a that is in sliding contact with the shoe 32, and a small-diameter end portion 41b that is rotatably supported by the inner peripheral surface of the tappet body 35, and an end surface 41c of the end portion 41b is formed. It is provided in a spherical shape. And the roller 41 is rotatably supported in the tappet body 35 because the end surface 41c contacts the inner peripheral surface of the tappet body 35 rotatably (refer to FIG. 2).

  In addition, the tappet mechanism 7 is provided with a non-rotating stopper (not shown) to suppress rotation around the axis of the tappet mechanism 7 itself (the axis of the tappet mechanism 7 is parallel to the vertical direction). .)

  The support hole 40 is provided in the pump housing 29 to which the high-pressure pump 5 is attached. The high-pressure pump 5 is mounted on the pump housing 29 so as to be coaxial with the support hole 40 and seals the upper side of the support hole 40. Further, the lower end of the support hole 40 opens into a cam chamber 44 that accommodates the cam 6, and the lower surface of the support hole 40 abuts the outer peripheral surface of the roller 41 and the peripheral edge of the cam 6, so that the roller 41 is moved to the cam 6. It is rotationally driven by. The cam 6 is provided around the drive shaft 45 so as to form apexes at intervals of 120 °, for example, and the drive shaft 45 is driven by the internal combustion engine.

  The solenoid valve 9 includes a solenoid coil 10 that is energized and controlled by the ECU, a stator 47 that passes the magnetic flux by energizing the solenoid coil 10, an armature 48 that transfers magnetic flux to and from the stator 47, and is magnetically attracted upward. Is integrated with a spring 49 and an armature 48 for biasing the valve body 50 downward, and moves in the vertical direction and opens and closes between the upstream fuel flow paths 16 and 17 and the pressurizing chamber 4. And a valve body 27 that forms a valve chamber 24 that houses the valve portion 26 of the valve body 50.

Here, the valve body 27 is provided with a slide hole 52 that slidably accommodates the shaft portion 51 so as to penetrate the valve body 27 in the vertical direction, and a valve chamber 24 is formed at the lower end of the slide hole 52. Has been.
The upper portion of the shaft portion 51 protrudes upward from the sliding hole 52, the armature 48 is fixed to the protruding portion, and the lower portion of the shaft portion 51 has a diameter smaller than that of the shaft portion 51. An annular fuel flow path 16 is formed between the wall surface of the sliding hole 52. The valve body 27 is provided with a fuel flow path 17 so as to connect the fuel flow paths 11 and 16.

  The tapered wall surface on the upper side of the valve chamber 24 forms a seat surface 53 on which the valve portion 26 is seated when the armature 48 and the valve body 50 are moved upward as the solenoid coil 10 is energized. Then, when the valve portion 26 is seated on the seat surface 53, the space between the valve chamber 24 and the fuel flow path 16 is closed. Further, when the armature 48 and the valve body 50 are biased by the spring 49 and move downward as the energization of the solenoid coil 10 is stopped, the valve portion 26 is separated from the seating surface 53 and the valve chamber 24 and the fuel flow path. 16 is opened. At this time, the valve body 50 is restricted from moving downward when the valve portion 26 contacts the flow path forming member 23.

  With the above configuration, the fuel supply pump 1 operates the electromagnetic valve 9 when the plunger 3 is moving upward so as to compress the pressurizing chamber 4, for example. It operates as a discharge amount metering type pump that regulates the discharge amount.

  That is, when the solenoid 3 is energized in the solenoid valve 9 while the plunger 3 is moving upward so as to compress the pressurizing chamber 4, the valve portion 26 and the fuel flow path 16 are caused by the valve portion 26. Is closed, and the space between the pressurizing chamber 4 and the upstream fuel flow paths 16 and 17 is closed. As a result, when the fuel pressure in the pressurizing chamber 4 increases and becomes higher than the valve opening pressure of the discharge valve 21, the discharge valve 21 opens and the supply of fuel from the fuel supply pump 1 to the common rail starts.

  When energization to the solenoid coil 10 is stopped, the valve section 26 opens the space between the valve chamber 24 and the fuel flow path 16, and the pressure chamber 4 and the upstream fuel flow paths 16, 17 are opened. Is released. As a result, when the fuel pressure in the pressurizing chamber 4 decreases and becomes smaller than the valve opening pressure of the discharge valve 21, the discharge valve 21 is closed and the supply of fuel from the fuel supply pump 1 to the common rail is finished.

[Features of Examples]
Features of the fuel supply pump 1 according to the embodiment will be described with reference to FIGS.
First, a plane including the rotation axis of the roller 41 and parallel to the vertical direction is defined as a symmetry plane α. At this time, the shoe 32 partially protrudes below the rotational axis of the roller 41 on both sides of the symmetry plane α, and holds the roller 41 below the rotational axis.

  That is, when the shoe 32 is divided into two portions 32a on one end side and 32b on the other end side in the rotation axis direction of the roller 41, the one end portion 32a protrudes below the rotation axis. The roller 41 is held on both upper and lower sides of the rotation axis. Further, the other end portion 32b retreats upward from the rotation axis and holds the roller 41 only above the rotation axis.

  Further, the lower end surface of the shoe 32 is divided on both sides of the symmetry surface α with the symmetry surface α in between (hereinafter, a portion of the lower end surface of the shoe 32 on one side of the symmetry surface α is referred to as a lower end surface 55a, The portion on the other side is referred to as the lower end surface 55b).

  Although the lower end surfaces 55a and 55b are separated on both sides of the symmetry plane α, they are provided so as to be included in one plane and are mirror-symmetric with respect to the symmetry plane α. Further, the lower end surfaces 55a and 55b extend over both the one end side and the other end side portions 32a and 32b, and the region forming the lower end of the one end side portion 32a of the lower end surfaces 55a and 55b is the rotation axis. The region forming the lower end of the portion 32b on the other end side extends on the upper side of the rotational axis.

  Further, the manufacturing method of the fuel supply pump 1 employs, in the shoe 32, any one of the dividing step of dividing the cylindrical material 57 into two materials 58a and 58b and the materials 58a and 58b obtained by the dividing step. And an assembly process to be incorporated into the tappet mechanism 7 (see FIG. 4). In the assembly process, the tappet mechanism 7 is assembled so that the cylindrical axes of the materials 58a and 58b are oriented in the vertical direction.

  Here, the material 57 is provided with a cylindrical through hole 57a having an axis perpendicular to the cylinder axis, and the material 57 is rotated by 180 ° about the axis of the through hole 57a. It has symmetry that overlaps the state before rotation. Further, the materials 58 a and 58 b have the same shape, and both can be employed as the shoe 32. That is, assuming that the cylindrical axis of the material 57 is oriented in the vertical direction, the material 57 is divided into the same shape that is vertically symmetrical in the dividing step.

  At this time, the material 57 is arranged in one direction so that the dividing surface 59a formed in the material 58a is included in one plane and the dividing surface 59b formed in the material 58b is included in one plane. Cut and split. When the material 58a is adopted as the shoe 32, the dividing surface 59a becomes the lower end surfaces 55a and 55b, and when the material 58b is adopted as the shoe 32, the dividing surface 59b becomes the lower end surfaces 55a and 55b. Further, the cylindrical surface on which the through hole 57 a has been formed is divided and becomes a holding surface for the roller 41.

[Effects of Examples]
According to the fuel supply pump 1 of the embodiment, the shoe 32 of the tappet mechanism 7 partially protrudes below the rotational axis of the roller 41 on both sides of the symmetry plane α and holds the roller 41 below. ing.
As a result, even if the lower end surfaces 55a and 55b as the lower edges of the shoe 32 are partially retracted above the rotational axis of the roller 41, the portion of the roller 41 is projected by the portion projecting below the rotational axis. Dropout can be prevented.

For this reason, with respect to the lower edge shape of the shoe 32, weight reduction can be achieved by freely setting a portion protruding downward from the rotational axis and a portion retracting upward. Two materials 58a and 58b can be obtained from one material 57, and cost reduction can be achieved.
As described above, in the tappet mechanism 7 of the fuel supply pump 1, it is possible to achieve weight reduction and cost reduction of the shoe 32 while satisfying the necessity of preventing the roller 41 from falling off.

Moreover, according to the manufacturing method of the fuel supply pump 1, when the dividing step assumes that the cylindrical axis of the cylindrical material 57 is oriented in the vertical direction, the material 57 has the same shape that is symmetrical in the vertical direction. The two materials 58a and 58b are divided.
Thus, two shoes 32 having the same performance can be obtained from one material 57.

Further, the dividing step is a columnar material so that the dividing surface 59a formed on the material 58a is included in one plane and the dividing surface 59b formed on the material 58b is included in one plane. 57 is divided into two.
Thereby, the two materials 58a and 58b can be obtained by cutting the material 57 in one direction. For this reason, a division | segmentation process can be simplified.

[Modification]
The aspect of the fuel supply pump 1 is not limited to an Example, A various aspect can be considered.
For example, according to the fuel supply pumps 1 of the first to fifth embodiments, the lower end surfaces 55a and 55b of the shoe 32 are provided so as to be included in one plane, and are mirror-symmetric with respect to the symmetry plane α. However, the shape of the shoe 32 is not limited to such a mode. For example, as shown in FIG. 5, the dividing surfaces 59a and 59b may be provided in a step shape, and the lower end surfaces 55a and 55b may each have a step.

DESCRIPTION OF SYMBOLS 1 Fuel supply pump 2 Cylinder 3 Plunger 4 Pressurization chamber 5 High pressure pump 6 Cam 7 Tappet mechanism 41 Roller 32 Shoe (alpha) Symmetry surface 57 Material (columnar-shaped material)
58a, 58b Material 59a, 59b Dividing surface

Claims (4)

A high-pressure pump (5) which accommodates and accommodates a plunger (3) in a cylinder (2) so as to be slidable in the axial direction; and a fuel pressurizing chamber (4);
A tappet mechanism (7) for reciprocating the plunger (3) in the axial direction by reciprocating linearly according to the rotation of the cam (6),
A fuel supply for supplying fuel to the internal combustion engine by sucking fuel into the pressurizing chamber (4) or discharging fuel from the pressurizing chamber (4) according to the reciprocating motion of the plunger (3). In the pump (1)
The tappet mechanism (7)
A roller (41) provided in a cylindrical shape and reciprocating in the axial direction of the plunger (3) while rotating by rotation of the cam (6) in contact with the outer periphery of the cam (6);
A shoe (32) that reciprocates in the axial direction of the plunger (3) while slidably holding the outer peripheral surface of the roller (41);
The axial direction of the plunger (3) is regarded as the vertical direction, the plunger (3) is disposed above the shoe (32), and the cam (6) is disposed below the roller (41). Further, if a plane parallel to the vertical direction including the rotation axis of the roller (41) is defined as a symmetry plane (α),
The shoe (32) partially protrudes below the rotational axis of the roller (41) on both sides of the symmetry plane (α) to hold the roller (41) on the lower side. A fuel supply pump (1) characterized by A method for manufacturing a fuel supply pump (1) according to claim 1,
The cylindrical material (57) is divided into two materials (58a, 58b), and at least one of the two materials (58a, 58b) (58a or 58b) is combined with the material of the shoe (32). Splitting process,
An assembly step of assembling the tappet mechanism (7) such that the cylindrical axis of the material (58a or 58b) obtained by the dividing step is oriented in the vertical direction,
In the dividing step, when the cylindrical axis of the cylindrical material (57) is considered to be oriented in the vertical direction, the cylindrical material (57) having the same shape that is symmetrical in the vertical direction is used. A method for producing a fuel supply pump (1), characterized in that it is divided into two materials (58a, 58b). In the manufacturing method of the fuel supply pump (1) according to claim 2,
In the dividing step, the dividing surface (59a or 59b) formed in the one material (58a or 58b) is included in one plane and the dividing material is formed in the other material (58b or 58a). Manufacturing of the fuel supply pump (1), wherein the cylindrical material (57) is divided into the two materials (58a, 58b) so that the surface (59b or 59a) is included in one plane. Method. A method for manufacturing a fuel supply pump (1) according to claim 1,
The cylindrical material (57) is divided into two materials (58a, 58b), and at least one of the two materials (58a, 58b) (58a or 58b) is combined with the material of the shoe (32). Splitting process,
An assembly step of assembling the tappet mechanism (7) such that the cylindrical axis of the material (58a, 58b) obtained by the dividing step is oriented in the vertical direction,
In the dividing step, the dividing surface (59a or 59b) formed in the one material (58a or 58b) is included in one plane and the dividing material is formed in the other material (58b or 58a). Manufacturing of the fuel supply pump (1), wherein the cylindrical material (57) is divided into the two materials (58a, 58b) so that the surface (59b or 59a) is included in one plane. Method.

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