JP2011094596A - Tappet device and fuel supply pump using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tappet device for minimizing an increase in the size of a fuel supply pump while improving the seizure resistance by increasing the diameter of a roller, and to provide the fuel supply pump using the same. <P>SOLUTION: The fuel supply pump 1 includes the tappet device 30 having reciprocating linear motion integral with a plunger 5. The tappet device 30 includes the roller 31 contacting the outer peripheral face of a cam 14, a shoe 33 having a circular supporting portion 34 slidably supporting the roller 31, and a body 44 storing them. A pin 32 is formed at the axial end of the roller 31. At a cam side end 39 of the shoe 33, a plate-like portion 38 is provided abutting on the body 44. The peripheral length of the supporting portion 34 is half or smaller than the peripheral length of an outer peripheral face 31a of the roller 31. At a cam side end 51 of the body 44, a recessed portion 48 and an engaging piece 49 are provided, abutting on the plate-like portion 38 and engaging with the pin 32, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tappet device and a fuel supply pump using the tappet device.

  A fuel supply pump that draws fuel into the pressurizing chamber and pressurizes and discharges the fuel taken in by the plunger that forms the pressurizing chamber together with the cylinder formed on the cylinder body reciprocates linearly by the rotation of the cam. Is known (see Patent Document 1).

  A tappet device that reciprocates linearly integrally with the plunger is disposed between the plunger of the fuel supply pump and the cam. Further, a spring that biases the plunger toward the cam side is provided between the cylinder body and the tappet device, and the tappet device receives a force toward the cam generated by the spring. The tappet device includes a roller that is in contact with a cam, a shoe having an arc-shaped holding portion that holds the roller in a slidable manner, and a cylinder that forms an accommodation portion in which a part of the roller, the shoe, and the spring is disposed on the inner peripheral side Body. In this prior art, the circumferential length of the holding portion of the shoe is more than half of the circumferential length of the outer peripheral surface of the roller, thereby preventing the roller from falling off to the cam side.

  Further, a stepped portion for determining an axial position of the shoe with respect to the body is formed on an axially intermediate portion of the inner peripheral wall of the body and a side wall of the shoe facing the inner peripheral wall of the body. In this tappet device, the axial position of the shoe with respect to the body is determined by abutting these stepped portions.

  In one example of the above prior art, the spring is disposed on the inner peripheral side with respect to the step portion formed on the body, and the urging force of the spring is applied to the shoe via the seat. In another example, the spring is not disposed on the inner circumferential side of the stepped portion formed on the body, but is disposed on the plunger side of the stepped portion, and the biasing force of the spring is set via the seat. It is given to the surface of the plunger side.

JP 2004-324535 A

  The shoe has a support portion that slidably supports a part of the outer peripheral surface of the roller. Since the roller is provided between the shoe and the cam, the support portion of the shoe constantly slides on the outer peripheral surface of the roller when the pump is operated.

  Here, there is a desire to further increase the fuel injection pressure in order to improve the combustion state in the internal combustion engine. This demand can be realized by increasing the discharge pressure of the fuel supply pump. However, when the discharge pressure of the pump is increased, the pressing force that presses each other at the contact portion between the support portion of the shoe and the outer peripheral surface of the roller increases. When the pressing force is increased, the oil film at the contact portion is easily cut, and the possibility that the support portion and the outer peripheral surface are seized increases.

  As a method for preventing this seizure, a method is known in which the pressure per unit area at the contact portion is reduced by increasing the roller diameter to disperse the pressing force, thereby suppressing the occurrence of oil film breakage. However, in the tappet device having the above-described prior art structure, if the roller diameter is simply increased, the weight of the tappet device increases, so that various parts constituting the pump have to be enlarged, and consequently the fuel supply pump. The physique will be enlarged.

  Hereinafter, an increase in size of the pump body due to an increase in the weight of the tappet device will be described in detail. When the weight of the tappet device increases, the inertial force acting on the tappet device increases, so when the tappet device moves from the cam side to the plunger side and tries to move to the cam side again, the roller separates from the cam mechanism. There is a fear. In order to prevent this, a spring having a larger urging force is employed as a spring for pressing the tappet device against the cam mechanism. In general, a spring having a large urging force has a large physique, and thus the physique such as a housing for housing the spring must be enlarged.

  As described above, the increase in the size of the fuel supply pump is caused not only by the increase in the size of the tappet device by increasing the roller diameter but also by the increase in the weight of the tappet device.

  Further, as described above, in the tappet device according to the prior art, a step portion for positioning the shoe is formed in the intermediate portion in the axial direction of the body. When the step portion is formed at such a position, in the example in which the spring is arranged on the inner peripheral side than the above-described step portion, the body size of the body increases by the length in the radial direction of the step portion. End up. Thereby, the physique of a tappet device will become large and the physique of a fuel supply pump will become large. Further, in the example in which the spring is arranged on the plunger side with respect to the stepped portion described above, since the stepped portion exists between the shoe and the spring, the spring is supported from the cam at least by the axial thickness of the stepped portion. The distance to the cylinder body is increased. For this reason, the physique of a fuel supply pump will become large.

  The present invention has been made in view of the above-described problems, and an object thereof is a tappet device capable of suppressing the enlargement of the fuel supply pump as much as possible while increasing the roller diameter and improving the seizure resistance, and the tappet thereof. A fuel supply pump using the apparatus is provided.

In order to achieve the above object, according to the first aspect of the present invention, the plunger that forms the pressurizing chamber together with the cylinder formed on the cylinder body reciprocates linearly by the rotation of the cam, so that the fuel is supplied to the pressurizing chamber. Is arranged between a plunger and a cam of a fuel supply pump that pressurizes and discharges the taken-in fuel, reciprocates linearly integrally with the plunger, and is provided between the cylinder body and a biasing means. In the tappet device that moves the plunger toward the cam by receiving the biasing force toward the cam generated by
A roller formed in a columnar shape and in contact with the outer peripheral surface of the cam; a shoe having a support portion formed in an arc shape that slidably supports a part of the outer peripheral surface of the roller; a part of the roller; a shoe; A cylindrical body that forms a housing portion for arranging a part of the urging means on the inner peripheral side,
A protrusion extending in the rotation axis direction of the roller is formed at the end of the roller in the axial direction, and a contact portion that contacts the body is provided at the cam-side end of the shoe. The axial length is less than half of the circumferential length of the outer peripheral surface of the roller, and the axial position of the shoe relative to the body is determined by contacting the contact portion of the shoe at the cam side end of the body. And an engaging portion that can be engaged with each protrusion of the roller.

  In this invention, the circumferential direction length of the support part which supports a part of outer peripheral surface of the roller provided in the shoe is half or less of the circumferential direction length of the outer peripheral surface of the roller. According to this configuration, the physique of the shoe can be made smaller than the physique of the shoe of the prior art, and therefore an increase in the weight of the shoe can be suppressed even if the roller diameter is increased. However, since the circumferential length of the support portion is less than or equal to half the circumferential length of the roller outer peripheral surface, this support portion does not have a function of preventing the roller from coming off to the cam side. Therefore, according to the present invention, an engagement portion that can be engaged with the protrusions extending in the rotation axis direction provided at both end portions in the axial direction of the roller is provided at the cam side end portion of the body. According to this structure, even if the roller tries to move toward the cam, the protrusion of the roller engages with the engaging portion, so that the roller can be prevented from falling off the tappet device. By adopting a structure in which the circumferential length of the support portion is less than half of the circumferential length of the outer peripheral surface of the roller and the body is provided with an engaging portion that can be engaged with the protruding portion of the roller, the roller falls off. The increase in the weight of the shoe can be suppressed. For this reason, even if the roller diameter is increased to improve the seizure resistance, it is possible to suppress an increase in the size of the fuel supply pump.

  In addition, according to the present invention, the cam-side end portion of the shoe is provided with a contact portion that comes into contact with the body, and the cam-side end portion of the body is provided with the positioning portion that comes into contact with the body. According to this configuration, the axial position of the shoe with respect to the body is determined by the contact between the shoe contact portion and the body positioning portion. With such a configuration, since the position of the shoe with respect to the body is determined, there is no need for a stepped portion for positioning the shoe at an intermediate portion in the axial direction of the body. For this reason, the inner diameter of the inner peripheral wall of the body can be made substantially the same size from the end on the plunger side to the end on the cam side excluding the engaging portion. Further, the inner diameter of the inner peripheral wall of the body can be set to a size matching the outer diameter of the biasing member accommodated in the accommodating portion. According to this, since the size of the body can be made to match the urging means, it is possible to suppress an increase in the size of the body. Further, by eliminating the stepped portion, the distance from the cam to the cylinder body can be shortened by the axial thickness of the stepped portion. According to this, the enlargement of the physique of the fuel supply pump can be suppressed.

  As described above, according to the above description, the weight of the tappet device is satisfied while satisfying the necessary functions as the tappet device (preventing the roller from falling off to the cam side, determining the axial position of the shoe body). The increase and enlargement of the size of the tappet device can be suppressed as much as possible, and the enlargement of the fuel supply pump can be suppressed.

  The invention according to claim 2 is characterized in that the engaging portion provided at the cam side end portion of the body has a protruding shape protruding toward the inner peripheral side from the inner peripheral wall of the body. According to the present invention, it is possible to prevent the roller from falling off to the cam side with a simple structure in which the engaging portion of the body has a projecting shape protruding to the inner peripheral side of the inner peripheral wall of the body.

  The invention according to claim 3 is characterized in that the abutting portion of the shoe has a protruding shape protruding outward from the side wall of the shoe facing the inner peripheral wall of the body. According to this invention, the axial position of the shoe relative to the body can be determined with a simple structure in which the contact portion of the shoe has a protruding shape protruding outward from the side wall of the shoe.

  In the invention according to claim 4, the positioning portion provided at the cam-side end of the body is recessed from the cam-side end of the body toward the plunger-side end, and the contact portion is fitted into the recessed portion. It is characterized by having a concave shape. According to the present invention, the body positioning portion is recessed from the cam side end portion toward the plunger side end portion, and has a simple structure in which the contact portion is fitted into the recessed portion. The circumferential position of the shoe relative to the body can be determined simultaneously as well as the axial position of the shoe relative to the body.

  The invention according to claim 5 is characterized in that the positioning portion provided at the cam-side end portion of the body has a protruding shape protruding toward the inner peripheral side from the inner peripheral wall of the body. According to this invention, the axial position of the shoe with respect to the body can be determined with a simple structure in which the positioning portion of the body has a protruding shape that protrudes inward from the inner peripheral wall of the body.

  According to a sixth aspect of the present invention, the shoe is formed with a through-hole penetrating the end portion on the cam side and the end portion on the plunger side. According to the present invention, since the shoe is formed with the through-hole penetrating the cam side end and the plunger side end, the increase in the weight of the shoe can be suppressed, and the increase in the size of the fuel supply pump can be suppressed. Can contribute.

  The fuel supply pump according to claim 7, a cylinder body having a cylinder, a plunger that forms a pressurizing chamber together with the cylinder, a plunger that reciprocates linearly in the cylinder, and a cam that reciprocates linearly by rotating, The tappet device according to any one of claims 1 to 6, which is disposed between the plunger and the cam. According to the present invention, since the tappet device according to any one of claims 1 to 6 is provided, the fuel that can suppress the increase in size even if the roller diameter is increased and the seizure resistance is improved. Supply pump can be provided.

It is sectional drawing which shows the structure of the fuel supply pump by 1st Embodiment of this invention. It is sectional drawing which shows the structure of the tappet apparatus shown in FIG. 1, FIG. 2 (a) is a figure which shows the cross section of the direction along the rotating shaft of a roller, FIG.2 (b) is a figure in Fig.2 (a). It is a figure which shows the IIB-IIB line | wire cross section. FIG. 3 is a three-side view showing the structure of the shoe of the tappet device shown in FIG. 2, FIG. 3 (a) is a view showing the surface of the shoe on the pressurizing chamber side, and FIG. 3 (b) is a view in FIG. It is a figure which shows the surface of a IIIB direction, FIG.3 (c) is a figure which shows the surface of the IIIC direction in Fig.3 (a). FIG. 4 is a three-sided view showing the structure of the body of the tappet device shown in FIG. 2, FIG. 4 (a) is a view showing a surface of the body on the pressurizing chamber side, and FIG. 4 (b) is a view in FIG. It is a figure which shows the surface of an IVA direction, and FIG.4 (c) is a figure which shows the surface of the IVC direction in Fig.4 (a). FIG. 5A is a cross-sectional view showing a structure of a tappet device of a fuel supply pump according to a second embodiment of the present invention, and FIG. 5A is a view showing a cross-section in the direction along the rotation axis of the roller, and FIG. These are figures which show the VB-VB line cross section in Fig.5 (a). 6 is a three-sided view showing the structure of the shoe of the tappet device shown in FIG. 5, FIG. 6 (a) is a view showing the surface of the shoe on the pressure chamber side, and FIG. 6 (b) is a view in FIG. It is a figure which shows the surface of a VIB direction, FIG.6 (c) is a figure which shows the surface of the VIC direction in Fig.6 (a). FIG. 7 is a three-side view showing the structure of the body of the tappet device shown in FIG. 5, FIG. 7A is a view showing a surface of the body on the pressurizing chamber side, and FIG. 7B is a view in FIG. It is a figure which shows the surface of a VIIB direction, FIG.7 (c) is a figure which shows the surface of the VIIC direction in Fig.7 (a).

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the component corresponding in each embodiment.

(First embodiment)
A cross section of the fuel supply pump according to the first embodiment of the present invention is shown in FIG. This fuel supply pump 1 is applied to a high-pressure pump used in a common rail fuel injection system of a diesel engine.

  The fuel supply pump 1 pressurizes fuel supplied from a fuel tank (not shown) via a low pressure pump (not shown) and supplies the pressurized fuel to a common rail (not shown). As shown in FIG. 1, the fuel supply pump 1 includes a pump housing 2. A cam chamber 9 is formed at one end of the pump housing 2. The cam chamber 9 accommodates a drive shaft 13 that is driven and rotated by the engine. A cam 14 is formed integrally with the drive shaft 13 on the drive shaft 13.

  A cylinder body 3 is attached to the side of the pump housing 2 opposite to the cam chamber 9. The cylinder body 3 is formed with a cylinder 4 that supports the plunger 5 so as to be capable of reciprocating linear movement. A tappet chamber 10 communicating with the cam chamber 9 is formed on the inner peripheral side of the pump housing 2 and closer to the cylinder body 3 than the cam chamber 9. The tappet chamber 10 is arranged coaxially with the cylinder 4. In the tappet chamber 10, a tappet device 30 is accommodated together with the plunger 5 so as to be able to reciprocate linearly.

  The plunger 5 is formed in a cylindrical shape. A pressurizing chamber 11 is formed from the upper end surface of the plunger 5 and the inner peripheral wall of the cylinder 4. The cylinder body 3 is formed with a fuel reservoir 12 through which fuel is supplied from a low-pressure pump (not shown) via an introduction pipe 15. The fuel reservoir 12 communicates with the fuel supply path 16 in the control valve 18 via the fuel supply path 17. The control valve 18 has an electromagnetic drive unit 19 and a valve member 20 driven by the electromagnetic drive unit 19. The valve member 20 can be seated on the valve seat portion 21. That is, the passage communicating with the pressurizing chamber 11 is opened and closed by controlling the electromagnetic drive unit 19.

  In the cylinder body 3, an electromagnetic drive unit 19 of a control valve 18 is screwed at a position facing the upper end surface of the plunger 5. The electromagnetic driving unit 19 communicates or blocks the fuel supply path 16 and the pressurizing chamber 11 by driving the valve member 20. By controlling the energization timing to the electromagnetic drive unit 19, the flow rate of fuel discharged from the fuel supply pump 1 to a common rail (not shown) is adjusted.

  The cylinder body 3 is provided with a discharge valve 22. The discharge valve 22 communicates with the pressurizing chamber 11 through the discharge hole 23. The pressurized fuel in the pressurizing chamber 11 opens the valve member 24 of the discharge valve 22 against the urging force of the spring 25 and the pressure of the fuel in the discharge hole 23, and the pressurized high-pressure fuel is It is sent from a discharge hole 23 into a common rail (not shown).

  A plunger head 6 is formed at the end of the plunger 5 on the cam chamber 9 side. A tappet device 30 is connected to the plunger head 6. An end of the tappet device 30 on the cam 14 side is in contact with the cam 14. The rotation axes of the plunger 5, the tappet device 30 and the cam 14 are arranged coaxially in this order. The structure of the tappet device 30 will be described in detail later.

  The tappet device 30 converts the rotational motion of the cam into a reciprocating linear motion and transmits the reciprocating linear motion to the plunger 5. The outer peripheral wall 45 of the tappet device 30 facing the inner peripheral wall of the tappet chamber 10 is movable relative to the inner peripheral wall while being in contact with the inner peripheral wall of the tappet chamber 10. According to this, the tappet device 30 can reciprocate linearly while contacting the inner peripheral wall of the tappet chamber 10.

  Between the tappet device 30 and the cylinder body 3, a spring 7 is provided as an urging means for pressing the tappet device 30 toward the cam 14. The end of the spring 7 on the pressurizing chamber 11 side is in contact with the upper seat 8 attached to the end of the cylinder body 3 on the pressurizing chamber 11 side, and the movement of the spring 7 to the pressurizing chamber 11 side is performed. It is regulated. The end of the spring 7 on the cam 14 side is in contact with the tappet device 30. Thereby, the pressing force (urging force) of the spring 7 is applied to the tappet device 30. Since the tappet device 30 is connected to the plunger 5, the plunger 5 is moved toward the cam 14 when the tappet device 30 receives the biasing force of the spring 7.

  The structure of the fuel supply pump 1 has been briefly described above. Next, the operation of the fuel supply pump 1 of the present embodiment will be described. As the drive shaft 13 rotates, the cam 14 integrated with the drive shaft 13 also rotates. Therefore, the tappet device 30 that comes into contact with the cam 14 moves along the outer peripheral surface (profile surface) of the cam 14 and reciprocates linearly along the axis of the tappet chamber 10 in the tappet chamber 10. Thereby, the plunger 5 connected to the tappet device 30 also reciprocates linearly along the axis of the cylinder 4 in the cylinder 4.

  When the plunger 5 descends in the cylinder 4, that is, moves toward the cam chamber 9, when the control valve 18 is opened, that is, when the valve member 20 is separated from the valve seat portion 21, the introduction pipe 15 and the fuel reservoir 12 are Fuel is sucked into the pressurizing chamber 11 via the fuel supply path 17 and the fuel supply path 16. When the control valve 18 is closed, that is, the valve member 20 is seated on the valve seat portion 21, the fuel sucked into the pressurizing chamber 11 can be pressurized. When no current is applied to the electromagnetic drive unit 19, the valve member 20 is separated from the valve seat unit 21, and as the plunger 5 moves up, that is, moves in a direction to reduce the volume of the pressurizing chamber 11. The fuel in the pressurizing chamber 11 overflows from the pressurizing chamber 11 to the fuel reservoir 12 via the fuel supply path 16 and the fuel supply path 17. Therefore, the fuel sucked into the pressurizing chamber 11 is not pressurized.

  When the fuel is overflowing from the pressurizing chamber 11, when a control pulse is sent to the electromagnetic drive unit 19, the valve member 20 is seated on the valve seat portion 21 and the pressurizing chamber 11 is closed. As a result, the fuel in the pressurizing chamber 11 begins to be pressurized as the plunger 5 moves up. When the fuel in the pressurizing chamber 11 is pressurized and the pressure of the fuel increases due to the biasing force of the spring 25 of the discharge valve 22 and the pressure of the fuel in the discharge hole 23, the discharge valve 22 is opened and pressurized. The fuel is discharged to the common rail (not shown) through the discharge hole 23.

(Characteristics: Tappet device)
Next, the tappet device 30 which is a characteristic part of the present embodiment will be described in detail with reference to FIGS. 2 shows a cross section of the tappet device 30 shown in FIG. 1, FIG. 2 (a) shows a cross section in the direction along the rotation axis of the roller 31, and FIG. 2 (b) shows the cross section of FIG. The IIB-IIB line cross section in (a) is shown. 3 is a three-sided view of the shoe 33 of the tappet device 30 shown in FIG. 2, FIG. 3 (a) shows the surface of the shoe 33 on the pressure chamber 11 side, and FIG. The surface in the IIIB direction in 3 (a) is shown, and FIG. 3 (c) shows the surface in the IIIC direction in FIG. 3 (a). 4 is a three-sided view of the body 44 of the tappet device 30 shown in FIG. 2, FIG. 4 (a) shows the surface of the body 44 on the pressurizing chamber 11 side, and FIG. 4 (a) shows a surface in the IVB direction, and FIG. 4 (c) shows a surface in the IVC direction in FIG. 4 (a). The tappet device 30 includes a roller 31, a shoe 33, a lower sheet 41, and a body 44.

(roller)
The roller 31 is made of an iron-based metal and is formed in a cylindrical shape. Pins 32 extending in the central axis direction of the roller 31 are formed at axial end portions on both sides of the roller 31. The outer peripheral surface 31a of the roller 31 is in contact with the profile surface of the cam 14, and the roller 31 can rotate around the pin 32 as the cam 14 rotates (see FIGS. 1 and 2). The roller 31 is installed in the fuel supply pump 1 so that the rotation axis of the roller 31 is parallel or substantially parallel to the rotation axis of the cam 14 and orthogonal to the reciprocating linear motion direction of the tappet device 30. In the present embodiment, the two pins 32 correspond to “projections” recited in the claims.

(Shoe)
The shoe 33 supports the roller 31 in a rotatable and slidable manner, is made of an iron-based metal, and is formed in a substantially rectangular parallelepiped shape (see FIGS. 1, 2, and 3). The shoe 33 is installed with respect to the fuel supply pump 1 so that the short axis direction thereof substantially coincides with the rotation axis of the roller 31. As shown in FIGS. 2 and 3B, an arc-shaped support portion 34 that rotatably supports the roller 31 is formed at the end portion (cam side end portion) 39 of the shoe 33 on the cam 14 side. ing. The radius of the contact surface 34a of the support portion 34 with the outer peripheral surface 31a of the roller 31 is substantially the same as the radius of the outer peripheral surface 31a. That is, the contact surface 34a supports the outer peripheral surface 31a of the roller 31 over substantially the entire surface. The length of the support portion 34 in the direction along the rotation axis of the roller 31 is substantially equal to the length of the roller 31 excluding the pin 32 in the rotation axis direction. In addition, the circumferential length of the contact surface 34 a is half of the circumferential length of the outer circumferential surface 31 a of the roller 31. The circumferential length of the contact surface 34a may be equal to or less than half of the circumferential length of the outer circumferential surface 31a of the roller 31.

  Engaging protrusions 36 that can be engaged with the inner peripheral wall 46 of the body 44 are formed at both ends in the major axis direction of the shoe 33 (FIGS. 2A, 3A, and 3B). )). Further, a total of six penetrating through the cam side end portion 39 and the end portion on the plunger 5 side (plunger side end portion) 40 are provided between each of the engagement protrusions 36 and the support portion 34. A hole 37 is formed.

  As shown in FIGS. 2, 3 (b), and 3 (c), the plunger side end portion 40 of the shoe 33 is substantially flat so that a lower seat 41 described later can be installed. Furthermore, a plate-like plate-like portion 38 that protrudes outward from the side wall of the engagement protrusion 36 is formed at the cam side end 39 of each engagement protrusion 36. These plate-like portions 38 can come into contact with a recess 48 formed in the body 44 (see FIG. 2A and FIG. 4). When the plate-like portion 38 comes into contact with the body 44, the axial positions of the shoe 33 and the roller 31 with respect to the body 44 are determined.

  Further, the length of the plate-like portion 38 in the direction orthogonal to the reciprocating linear motion direction is such that the tip of the plate-like portion 38 does not protrude outward from the outer peripheral wall 45 of the body 44 when the plate-like portion 38 is brought into contact with the body 44. It has become the length. In the present embodiment, the support portion 34 of the shoe 33 corresponds to the “support portion” recited in the claims, and the two plate-shaped portions 38 correspond to the “contact portion” recited in the claims. To do.

(Lower seat)
The lower seat 41 is provided on the plunger-side end portion 40 of the shoe 33, supports the other end portion of the spring 7, and connects the tappet device 30 and the plunger 5, and is formed in a disc shape. Yes. The outer diameter of the lower seat 41 is approximately the same as the width of the shoe 33 in the major axis direction. An engaging portion 42 that engages the plunger head 6 is formed at the center of the lower seat 41, and a support portion 43 that supports the other end of the spring 7 is formed around the engaging portion 42. Yes. The lower sheet 41 is formed such that the support portion 43 abuts on the plunger side end portion 40 of the shoe 33 and the engaging portion 42 portion is separated from the plunger side end portion 40. Thereby, as shown in FIG. 1 and FIG. 2, a gap is formed between the lower seat 41 and the plunger side end 40, and the plunger head 6 is accommodated in the gap.

(Body)
The body 44 forms part of the roller 31, the shoe 33, the lower sheet 41, and the accommodation part 47 that accommodates the other end side of the spring 7. The body 44 is made of iron-based metal and has a cylindrical shape. It is the housing | casing of the tappet apparatus 30 to be performed. The inner diameter of the body 44 is set to a size such that a gap that allows the spring 7 to expand and contract in the housing portion 47 is formed between the outer peripheral portion of the spring 7 and the inner peripheral wall 46 of the body 44. In addition, the inner diameter is substantially the same from an end portion (plunger side end portion) 52 on the plunger 5 side to an end portion (cam side end portion) 51 on the cam 14 side excluding the engagement piece 49.

  The cam-side end 51 of the body 44 is formed with a recess 48 into which each plate-like portion 38 provided on the shoe 33 is fitted at a position corresponding to each plate-like portion 38. These concave portions 48 are recessed from the cam side end portion 51 toward the plunger side end portion 52 (see FIGS. 4A and 4C). The depths of the recesses 48 are substantially the same as the thicknesses of the corresponding plate-like portions 38 in the reciprocating linear motion direction. Further, the widths of the concave portions 48 are larger than the widths of the corresponding plate-like portions 38 in the direction perpendicular to the reciprocating linear motion direction.

  According to this structure, by inserting the shoe 33 supporting the roller 31 from the cam side end portion 51 of the body 44, the respective plate-like portions 38 of the shoe 33 are fitted into the respective concave portions 48. Thereby, the axial direction position with respect to the body 44 of the shoe 33 and the roller 31 is determined.

  In the present embodiment, the shoe 33 is fixed to the body 44 by press-fitting the side wall of the engagement protrusion 36 of the shoe 33 into the inner peripheral wall 46 of the body 44 (see FIG. 2A). ). It is desirable that the width of each concave portion 48 is substantially the same as the width of the corresponding plate-like portion 38. If the widths of the two are substantially the same, the positions in the circumferential direction of the shoe 33 and the roller 31 can be determined simultaneously when the plate-like portions 38 corresponding to the respective concave portions 48 are fitted. In the present embodiment, these two concave portions 48 correspond to “positioning portions” recited in the claims.

  On the cam side end 51 of the body 44, in addition to the recess 48, two engaging pieces 49 are formed as engaging portions that can be engaged with the respective pins 32 of the roller 31. These engagement pieces 49 are formed between the recess 48 and the other recess 48 (see FIGS. 4A and 4B). As shown in FIG. 4B, the engagement piece 49 is formed between two cutout portions 50 that are recessed from the cam side end portion 51 toward the plunger side end portion 52. The engagement piece 49 formed in this way can be bent in the vicinity of a line segment connecting the bottoms of the two notches 50 (see FIG. 4B). As shown in FIGS. 2B and 4C, each engaging piece 49 is bent to the inner peripheral side with respect to the inner peripheral wall 46 of the body 44, and the distance between the end portions on the free end side is a roller. It is shorter than the distance between the tips of the 31 pins 32. According to this configuration, when the roller 31 tries to move to the cam 14 side, each pin 32 is engaged with each engagement piece 49, and the roller 31 does not fall off to the cam 14 side.

  Further, the distance between the end portions on the free end side of each engagement piece 49 is longer than the length of the roller 31 in the rotation axis direction excluding the pin 32. By doing so, a part of the outer peripheral surface 31 a of the roller 31 can be protruded from the cam side end portion 51 of the body 44, and the outer peripheral surface 31 a can be reliably brought into contact with the profile surface of the cam 14.

  As described above, since the circumferential length of the contact surface 34a in the support portion 34 of the shoe 33 is half of the circumferential length of the outer circumferential surface 31a of the roller 31, the effect of preventing the roller 31 from falling off by the shoe 33 can be expected. Absent. On the other hand, in this embodiment, a structure is employed in which the engagement piece 49 provided on the body 44 can prevent the roller 31 from falling off to the cam 14 side. According to this, it is possible to prevent the roller 31 from dropping without providing the shoe 33 with a structure for preventing the roller 31 from dropping off.

  Further, in this embodiment, the engagement piece 49 formed by providing the notch 50 is projected to the inner peripheral side with respect to the inner peripheral wall 46 of the body 44 with the pin 32 of the roller 31. Engagement is realized. In addition, the function of preventing the rollers 31 from falling off by the engagement pieces 49 can be realized by a very simple operation of bending the engagement pieces 49. In the present embodiment, these two engagement pieces 49 correspond to the “engagement portion” described in the claims.

  Next, the manufacturing process of the tappet device 30 of this embodiment will be described. First, a body 44 in a state where the engagement piece 49 is not bent and a shoe 33 in which the roller 31 is supported by the support portion 34 are prepared. Next, the shoe 33 is inserted from the cam side end portion 51 of the body 44 with the plate-like portion 38 of the shoe 33 facing the cam 14 side, and is pushed in until reaching a predetermined position. The shoe 33 is pushed into the body 44 until the plate-like portion 38 of the shoe 33 is fitted into the recess 48 of the body 44. Then, in the state as it is, each engagement piece 49 is bent to the inner peripheral side from the inner peripheral wall 46 of the body 44. The tappet device 30 is manufactured by such a procedure.

  Next, in order to improve the seizure resistance at the contact portion between the shoe 33 and the roller 31, the tappet device of the prior art when the roller diameter is enlarged and the tappet according to the present embodiment in which the roller diameter is increased to the same size. The operational effects of the tappet device 30 according to the present embodiment will be described while comparing with the device 30.

  In the prior art, in the part corresponding to the shoe, the circumferential length of the contact surface of the support portion is longer than half of the circumferential length of the outer circumferential surface of the roller. In the prior art, the shoe support portion prevents the roller from dropping off to the cam side. In this case, when the roller diameter is increased, the size of the shoe inevitably increases, and the weight of the shoe increases.

  On the other hand, in the shoe 33 of this embodiment, the circumferential length of the contact surface 34a in the support portion 34 is half of the circumferential length of the outer circumferential surface 31a of the roller 31. For this reason, even if it is a case where a roller diameter is enlarged, it becomes possible to make the physique of the shoe 33 small compared with a conventional one, and the increase in the weight of the shoe 33 can be suppressed. However, in this embodiment, since the circumferential length of the contact surface 34a is half of the circumferential length of the outer peripheral surface 31a of the roller 31, the shoe 33 prevents the roller 31 from dropping out toward the cam 14 side. There is no function.

  Therefore, in the tappet device 30 of this embodiment, the pin 31 of the roller 31 is engaged with the engagement piece 49 provided at the cam side end portion 51 of the body 44, so that the roller 31 is dropped to the cam 14 side. Is preventing. Therefore, it is not necessary to provide the shoe 33 with a structure for preventing the roller 31 from falling off. Accordingly, the weight increase of the shoe 33 can be suppressed.

  Further, according to the tappet device of the prior art, the axial positioning of the shoe supporting the roller with respect to the body is performed by the step provided on the axially intermediate portion of the inner peripheral wall of the body and the side wall of the shoe facing the inner peripheral wall of the body. This is done by matching the parts together. When the step portion is formed at such a position, in the example in which the spring is arranged on the inner peripheral side than the above-described step portion, the body size of the body increases by the length in the radial direction of the step portion. End up. Thereby, the physique of a tappet device will become large and the physique of a fuel supply pump will become large. Further, in the example in which the spring is arranged on the plunger side with respect to the stepped portion described above, since the stepped portion exists between the shoe and the spring, the spring is supported from the cam at least by the axial thickness of the stepped portion. The distance to the cylinder body is increased. For this reason, the physique of a fuel supply pump will become large.

  On the other hand, in the tappet device 30 of the present embodiment, the structure provided in the cam side end portion 39 of the shoe 33 is provided in the two concave portions 48 provided in the cam side end portion 51 of the body 44 and in the simple structure. The position of the shoe 33 in the axial direction with respect to the body 44 is determined by fitting two simple plate-like plate-like portions 38. According to this configuration, it is not particularly necessary to provide a stepped portion at the intermediate portion in the axial direction of the body 44. For this reason, the inner diameter of the inner peripheral wall 46 of the body 44 can be made substantially the same size from the plunger side end 52 to the cam side end 51 excluding the engagement piece 49.

  In the present embodiment, the inner diameter is such that a gap is formed between the outer peripheral portion of the spring 7 and the inner peripheral wall 46 of the body 44 so that the spring 7 can expand and contract in the accommodating portion 47. That is, the inner diameter is a size that matches the outer diameter of the outer peripheral portion of the spring 7. According to this, since the physique of the body 44 can be made into the magnitude | size match | combined with the magnitude | size of the spring 7, the enlargement of the physique of the body 44 can be suppressed. Further, in this embodiment, since the step portion provided in the body of the prior art can be eliminated, the distance from the cam 14 to the cylinder body 3 can be reduced by the axial thickness of the step portion. According to this, the enlargement of the physique of the pump housing 2 can be suppressed, and as a result, the physique of the fuel supply pump 1 can be prevented from being enlarged.

  As described above, according to these, even if the seizure resistance is improved as the roller diameter is increased, the necessary functions as the tappet device 30 (prevention of the roller from coming off to the cam side, axial position relative to the shoe body) The tappet device 30 that can suppress the increase in the size of the fuel supply pump 1 is obtained.

  In the present embodiment, the plate-like portion 38 that protrudes outward from the cam-side end portion 39 of the engagement protrusion 36 in the shoe 33 is fitted into the recess 48 provided in the cam-side end portion 51 of the body 44. The axial position of the shoe 33 with respect to the body 44 is determined. As a structure for determining the axial position, the position of the shoe 33 relative to the axial direction of the body 44 can be realized only by adopting a very simple structure of the plate-like portion 38 and the recess 48 into which the plate-like portion 38 is fitted. . According to this, since the structure becomes very simple, it is possible to suppress the increase in the weight of the tappet device 30 and, of course, to reduce the manufacturing cost.

  In addition, the circumferential position of the shoe 33 can be determined simultaneously by fitting the plate-like portion 38 into the recess 48. According to this, the position of the pin 32 of the roller 31 and the position of the engagement piece 49 of the body 44 can be adjusted to an appropriate position at the same time.

  Furthermore, in this embodiment, the engagement piece 49 that can be engaged with the pin 32 of the roller 31 is formed on the cam side end portion 51 of the body 44, thereby preventing the roller 31 from dropping off to the cam 14 side. . Since the engaging piece 49 is bent toward the inner peripheral side of the inner peripheral wall 46 of the body 44, the structure is very simple. According to this, the suppression of the increase in the weight of the tappet device 30 can of course be expected to reduce the manufacturing cost. Furthermore, in the present embodiment, since the six through holes 37 are formed between the engagement protrusion 36 and the support portion 34 of the shoe 33, an increase in the weight of the shoe 33 can be suppressed. In the present embodiment, the engine to which the fuel supply pump 1 supplies fuel is a diesel engine, but it may be a gasoline engine.

(Second Embodiment)
The second embodiment is a modification of the tappet device 30 of the first embodiment. Since the fuel supply pump 1 using the tappet device 130 according to the second embodiment is the same except for the tappet device 130, only the tappet device 130 will be described here with reference to FIGS. 5 to 7. 5 shows a cross-section of the tappet device 130, FIG. 5 (a) shows a cross-section in the direction along the rotation axis of the roller 31, and FIG. 5 (b) is a view in FIG. 5 (a). The VB-VB line cross section of is shown. 6 is a three-sided view of the shoe 133 of the tappet device 130 shown in FIG. 5, FIG. 6 (a) shows the surface of the shoe 133 on the side of the pressurizing chamber 11, and FIG. 6 (a) shows the surface in the VIB direction, and FIG. 6 (c) shows the surface in the VIC direction in FIG. 6 (a). 7 is a three-sided view of the body 144 of the tappet device 130 shown in FIG. 5, FIG. 7 (a) shows the surface of the body 144 on the pressurizing chamber 11 side, and FIG. 7A shows the surface in the VIIB direction, and FIG. 7C shows the surface in the VIIC direction in FIG. 7A. Similar to the first embodiment, the tappet device 130 of this embodiment includes a roller 31, a shoe 133, a lower sheet 41, and a body 144.

(roller)
Since the structure of the roller 31 is the same as the structure of the roller 31 of the first embodiment, the description of the roller 31 is omitted here. Here, each part of the roller 31 and the number assigned thereto are the same as those in the first embodiment.

(Shoe)
The shoe 133 supports the roller 31 in a rotatable manner, is made of an iron-based metal, and is formed in a substantially rectangular parallelepiped shape (see FIGS. 5 and 6). The shoe 133 is installed with respect to the fuel supply pump 1 such that the short axis direction thereof substantially coincides with the rotation axis of the roller 31. As shown in FIGS. 5 and 6B, an arc-shaped support portion 134 that rotatably supports the roller 31 is formed on the end portion (cam side end portion) 139 of the shoe 133 on the cam 14 side. ing. The radius of the contact surface 134a of the support portion 134 with the outer peripheral surface 31a of the roller 31 is substantially the same as the radius of the outer peripheral surface 31a. That is, the contact surface 134a supports the outer peripheral surface 31a of the roller 31 over substantially the entire surface. The length of the support portion 134 in the direction along the rotation axis of the roller 31 is substantially equal to the length of the roller 31 excluding the pin 32 in the rotation axis direction. In addition, the circumferential length of the contact surface 134 a is half of the circumferential length of the outer circumferential surface 31 a of the roller 31. The circumferential length of the contact surface 134a only needs to be half or less of the circumferential length of the outer circumferential surface 31a of the roller 31.

  Engaging protrusions 136 that can engage with the inner peripheral wall 146 of the body 144 are formed at both ends in the major axis direction of the shoe 133 (FIGS. 5A, 6A, and 6B). )). In addition, a total of six penetrating through the cam side end 139 and the plunger 5 side end (plunger side end) 140 are provided between the respective engagement protrusions 136 and the support 134. A hole 137 is formed.

  As shown in FIGS. 5 and 6B and 6C, the plunger side end portion 140 of the shoe 33 is substantially flat so that a lower seat 41 described later can be installed. Unlike the shoe 33 of the first embodiment, the shoe 133 does not have a plate-like portion 38 formed on the cam side end portion 139 of the engaging projection 136. In the present embodiment, shoulder portions 138 are formed at the corners of the cam side end portion 139 as a portion replacing the plate-like portion 38 of the first embodiment. The shoulder 138 is formed on each engagement protrusion 136. The shoulder 138 can abut on a first bent portion 148 formed on the body 44 (see FIGS. 5A and 7). When the shoulder portion 138 contacts the first bent portion 148, the axial position of the shoe 133 and the roller 31 with respect to the body 144 is determined.

  In this embodiment, since the portion for determining the axial position of the shoe 133 relative to the body 144 is simpler than that of the first embodiment, an increase in the weight of the shoe 133 can be further suppressed. In the present embodiment, the support portion 134 of the shoe 33 corresponds to the “support portion” described in the claims, and the two shoulder portions 138 correspond to the “contact portion” described in the claims. .

(Lower seat)
Since the structure of the lower seat 41 is the same as the structure of the lower seat 41 of the first embodiment, the description of the lower seat 41 is omitted here. Here, each part of the lower sheet 41 and the number assigned thereto are the same as those in the first embodiment.

(Body)
The body 144 forms a part of the roller 31, the shoe 133, the lower sheet 41, and a housing part 147 that houses the other end side of the spring 7. The body 144 is made of an iron-based metal and has a cylindrical shape. It is the housing | casing of the tappet apparatus 130 to be performed. The inner diameter of the body 144 is set such that a gap is formed between the outer peripheral portion of the spring 7 and the inner peripheral wall 146 of the body 144 so that the spring 7 can expand and contract in the housing portion 147. In addition, the inner diameter is substantially the same from the end portion (plunger side end) 152 on the plunger 5 side to the end portion (cam side end portion) 151 on the cam 14 side excluding the first and second bent portions 148 and 149. It has become.

  A first bent portion 148 is formed on the cam side end portion 151 of the body 44 at a position where each shoulder portion 138 provided on the shoe 33 abuts (FIGS. 5A and 7A). ), See (b)). As shown in FIGS. 5A, 7A, and 7B, these first bent portions 148 are formed by bending the cam side end portion 151 toward the inner peripheral side of the inner peripheral wall 146 of the body 144. Has been. As the shoulder 138 comes into contact with the bending start portion of the first bent portion 148, the axial position of the shoe 133 supporting the roller 31 with respect to the body 144 is determined. The larger the bending allowance of the first bending portion 148 (the distance from the bending start portion to the cam side end portion) is, the more the shoe 133 is disposed on the plunger 5 side with respect to the body 144. In this embodiment, unlike the first embodiment, it is not necessary to form the plate-like portion 38 in the shoe 133 and the recess 48 in the body 144, so that the structure becomes very simple.

  In this embodiment, after the first bent portion 148 is formed in advance with a predetermined bending margin, the shoulder 133 is directed toward the cam-side end 151 from the plunger-side end 152 of the body 144, and the shoulder 133. Is inserted until it comes into contact with the first bent portion 148. In this way, the axial position of the shoe 133 relative to the body 144 is determined. In the present embodiment, the shoe 133 is fixed to the body 144 by press-fitting the side wall of the engagement protrusion 136 of the shoe 133 into the inner peripheral wall 146 of the body 144 (see FIG. 5A). ). In the present embodiment, these two first bent portions 148 correspond to “positioning portions” described in the claims.

  In addition to the first bent portion 148, two second bent portions 149 as engaging portions that can be engaged with the respective pins 32 of the roller 31 are formed on the cam side end portion 151 of the body 44. These second bent portions 149 are formed between the first bent portion 148 and the other first bent portion 148 (see FIGS. 5B, 7A, and 7C). . The second bent portion 149 is formed by bending the cam-side end portion 151 from the inner peripheral wall 146 of the body 144 to the inner peripheral side, similarly to the first bent portion 148, as indicated by a broken line in FIG. Has been. Further, as shown in FIG. 5B, the distance between the end portions of the second bent portions 149 on the free end side is shorter than the distance between the tips of the pins 32 of the roller 31. When the roller 31 tries to move to the cam 14 side, each pin 32 comes into contact with each second bent portion 149, and the roller 31 does not fall off to the cam 14 side.

  Further, the distance between the end portions of the second bent portions 149 on the free end side is longer than the length of the roller 31 in the rotation axis direction excluding the pin 32. By doing so, a part of the outer peripheral surface 31 a of the roller 31 can be protruded from the cam side end portion 151 of the body 144, and the outer peripheral surface 31 a can be reliably brought into contact with the profile surface of the cam 14.

  In this embodiment, the bending margin of the second bent portion 149 is set smaller than that of the first bent portion 148. In this embodiment, since the circumferential length of the contact surface 134a of the support portion 134 in the shoe 133 is half the circumferential length of the outer circumferential surface 31a of the roller 31, the cam side end portion 139 of the shoe 133 is The axis of rotation of the pin 32 of the roller 31 is arranged on the plane that includes it. That is, the outer peripheral surface of the pin 32 is located closer to the cam 14 and the plunger 5 than the plane. If the bending margin of the second bent portion 149 is the same as that of the first bent portion 148, the outer periphery of the pin 32 is inserted before the shoulder portion 138 contacts the first bent portion 148 when the shoe 133 is inserted into the body 144. The surface comes into contact with the second bent portion 149, and positioning of the shoe 133 with respect to the body 144 becomes difficult. Therefore, in this embodiment, the bending margin is made smaller than that of the first bent portion 148 so that the second bent portion 149 does not contact the pin 32 first.

  Since the circumferential length of the contact surface 134a in the support portion 134 of the shoe 133 is half of the circumferential length of the outer circumferential surface 31a of the roller 31, the effect of preventing the roller 31 from falling off by the shoe 133 cannot be expected. On the other hand, in this embodiment, a structure that can prevent the roller 31 from dropping off toward the cam 14 at the second bent portion 149 provided on the body 144 is employed. According to this, it is possible to prevent the roller 31 from dropping without providing the shoe 133 with a structure for preventing the roller 31 from falling off.

  In this embodiment, the engagement of the roller 31 with the pin 32 is realized with a very simple structure in which the cam-side end portion 151 is bent to form the second bent portion 149. In addition, the function of preventing the roller 31 from falling off by the second bent portion 149 can be realized by a very simple operation of simply bending the cam side end portion 151. In the present embodiment, these two second bent portions 149 correspond to “engagement portions” recited in the claims.

  Next, the manufacturing process of the tappet device 130 of this embodiment will be described. First, the cam side end 151 of the body 144 is bent in advance to form two first bent portions 148 and two second bent portions 149, and a shoe 133 in which the roller 31 is supported by the support portion 134 is prepared. . Next, with the shoulder portion 138 of the shoe 133 facing the cam 14 side, the shoe 133 is inserted from the plunger side end portion 152 of the body 144 and pushed into a predetermined position. The shoe 33 is pushed into the body 44 until the shoulder portion 138 of the shoe 133 contacts the first bent portion 148. With such a procedure, the tappet device 130 is formed.

  In this embodiment, the shoe 133 is inserted into the body 144 with respect to the second bent portion 149 formed in advance, but the second bent portion 149 is formed by the shoulder portion 138 of the shoe 133 being the first one. You may carry out after contacting the one folding part 148.

  As described above, even in the tappet device 130 of the present embodiment, even if the roller diameter is increased in order to improve the seizure resistance, the increase in weight is suppressed as much as the tappet device 30 of the first embodiment. In addition, the increase in size of the tappet device 130 can be suppressed. Therefore, the tappet device 130 according to the present embodiment can also suppress an increase in the size of the fuel supply pump 1.

  DESCRIPTION OF SYMBOLS 1 Fuel supply pump, 2 Pump housing, 3 Cylinder body, 4 Cylinder, 5 Plunger, 7 Spring, 9 Cam chamber, 10 Tappet chamber, 11 Pressurization chamber, 12 Fuel reservoir, 13 Drive shaft, 14 Cam, 15 Introducing pipe, 16 Fuel supply path, 17 Fuel supply path, 18 Control valve, 19 Electromagnetic drive part, 22 Discharge valve, 30 Tappet device, 31 Roller, 31a Outer peripheral surface, 32 Pin (protrusion part), 33 Shoe, 34 Support part (support part) ), 34a contact surface, 36 engagement protrusion, 37 through hole, 38 plate-like portion (contact portion), 39 cam side end, 40 plunger side end, 41 lower seat, 42 engagement portion, 43 support portion, 44 body, 45 outer peripheral wall, 46 inner peripheral wall, 47 accommodating portion, 48 concave portion (positioning portion), 49 engaging piece (engaging portion), 50 notch portion, 51 cam side end , 52 Plunger side end

Claims (7)

A fuel supply that injects fuel into the pressurizing chamber and pressurizes and discharges the fuel taken in by the plunger that forms the pressurizing chamber together with the cylinder formed on the cylinder body reciprocally moves linearly by rotation of the cam It is disposed between the plunger of the pump and the cam, and reciprocates linearly together with the plunger, and receives a biasing force toward the cam generated by a biasing means provided between the cylinder body. In the tappet device that moves the plunger toward the cam by:
A roller formed in a cylindrical shape and in contact with the outer peripheral surface of the cam;
A shoe having a support portion formed in an arc shape that slidably supports a part of the outer peripheral surface of the roller;
A cylindrical body that forms an accommodating portion for disposing a part of the roller, the shoe, and a part of the biasing means on an inner peripheral side;
A protrusion extending in the rotation axis direction of the roller is formed at the axial end of the roller,
The cam side end of the shoe is provided with a contact portion that contacts the body,
The circumferential length of the support portion of the shoe is less than or equal to half the circumferential length of the outer peripheral surface of the roller,
A cam-side end of the body is engageable with a positioning portion that determines an axial position of the shoe with respect to the body by abutting with the abutting portion of the shoe, and each protrusion of the roller. A tappet device provided with a simple engaging portion.   2. The tappet device according to claim 1, wherein the engaging portion provided at the cam-side end portion of the body has a protruding shape protruding toward an inner peripheral side with respect to an inner peripheral wall of the body.   3. The tappet device according to claim 1, wherein the contact portion of the shoe has a protruding shape protruding outward from a side wall of the shoe facing an inner peripheral wall of the body.   The positioning portion provided at the cam side end portion of the body is recessed from the cam side end portion of the body toward the plunger side end portion, and the contact portion is fitted into the recessed portion. The tappet device according to claim 3, wherein the tappet device has a shape.   3. The tappet device according to claim 1, wherein the positioning portion provided at the cam-side end portion of the body has a protruding shape that protrudes inward from the inner peripheral wall of the body. .   The tappet device according to any one of claims 1 to 5, wherein the shoe has a through-hole penetrating the end portion on the cam side and the end portion on the plunger side. A cylinder body having a cylinder;
A plunger that forms a pressure chamber together with the cylinder, and reciprocates linearly in the cylinder;
A cam for reciprocating linear movement of the plunger by rotating;
A fuel supply pump comprising: the tappet device according to any one of claims 1 to 6 disposed between the plunger and the cam.

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