JP2013217304A - Tappet for pump and high-pressure fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tappet for a pump which has an inexpensive constitution and is reducible in weight.SOLUTION: A tappet 31 for a pump comprises: a shaft 27; a rolling bearing 20 arranged at the outside diameter side of the shaft 27 and abutting on a cam 12 and its outside diameter face 22; and an intermediate bottom 34 for partitioning a cylindrical peripheral wall 33 and an internal space of the peripheral wall 33. The tappet also includes a case 32 for accommodating the shaft 27 and the rolling bearing 20. The case 32 comprises: a first member 36 including a cylindrical external wall whose both ends are opened; a second member 41 which is arranged at the inside diameter side of the first member 36, and whose one end is opened, and the other end is closed by a first bottom wall 44; and a positioning pin 56 or the like as a holding mechanism for causing the first member 36 to hold the second member 41. The first member 36 and the second member 41 are manufactured by press processing, respectively.

Description

  The present invention relates to a pump tappet (hereinafter sometimes simply referred to as a “tappet”) and a high-pressure fuel pump to which the pump tappet is applied.

  Some engines of automobiles and motorcycles are provided with a high-pressure fuel pump that injects fuel at a high pressure. The high-pressure fuel pump converts the rotational motion of the camshaft provided with the cam to the reciprocating linear motion of the pump plunger, and sends the fuel gas by the reciprocating linear motion of the pump plunger to increase the pressure in the high-pressure chamber, The fuel is supplied by injecting it. As a constituent member of the high-pressure fuel pump, there is a pump tappet that transmits the rotational motion of the camshaft to the pump plunger as a reciprocating linear motion. There are several types of pump tappets, such as sliding tappets and roller-containing tappets including rollers, depending on the shape of the contact portion with the cam.

  Here, a technology related to a pump tappet including rollers is disclosed in DE 10 2005 047 234 A1 (Patent Document 1). The tappet as a roller push rod shown in Patent Document 1 has a push rod housing and a push rod roller (roller bearing) fixed to the push rod housing and supported by a needle. The roller push rod is driven by a three-stage cam of a cam shaft that rotates clockwise. At the same time, the roller push rod is guided in the axial direction in the push rod guide hole to drive a pump plunger of a high pressure fuel pump (not shown).

  In addition, a roller lifter also called a tappet disclosed in Japanese Patent Application Laid-Open No. 2010-059892 (Patent Document 2) is configured to include a main body that rotatably supports a roller. And a main body is the structure which has a flat base part, the roller holding part which hold | maintains a roller between plate-shaped parts, and the guide part curvedly formed so that a cylindrical surface shape may be followed and used as a guide surface.

DE 10 2005 047 234 A1 JP 2010-059892 A

  According to the roller lifter described in Patent Document 2, the guide portion is curved so as to follow the cylindrical surface shape, and a slit is formed between the plate-like portions. When such a slit is present, when the roller lifter performs a reciprocating linear motion, the inner wall surface of the guide hole may be worn at the edge of the slit.

  Further, in an integrated pump tappet as in Patent Document 1, a case for accommodating a roller bearing or the like corresponding to a guide portion is basically manufactured by cold forging. In such molding by cold forging, the thickness of the molded product becomes relatively thick. As a result, the weight of the pump tappet increases. As a result, the inertial force during the reciprocating linear motion of the pump tappet increases, and the load applied to the pump plunger, the bearing, and the like increases. Such a phenomenon is not preferable because it also causes a reduction in the life of the bearing. In this case, after performing cold forging, the thickness can be reduced by thinning, but this leads to an increase in a new manufacturing process, and the cost cannot be reduced.

  The objective of this invention is providing the tappet for pumps which is an inexpensive structure and can implement | achieve weight reduction.

  Another object of the present invention is to provide a high-pressure fuel pump that has an inexpensive configuration and can achieve a long service life.

  Still another object of the present invention is to provide a two-wheeled vehicle that has an inexpensive configuration and can achieve a long life.

  Still another object of the present invention is to provide an automobile that has an inexpensive configuration and can achieve a long life.

  The pump tappet according to the present invention transmits the rotational motion of the camshaft provided with the cam to the pump plunger as a reciprocating linear motion, and performs the reciprocating linear motion together with the pump plunger. The pump tappet is provided with a shaft, a bearing provided on the outer diameter side of the shaft, a cam and a bearing that abuts on the outer diameter surface, a cylindrical peripheral wall and an intermediate bottom that partitions the inner space of the peripheral wall. And a housing case. The case is disposed on the inner diameter side of the first member including a cylindrical outer wall portion that is open at both ends, the one end portion is open, and the other end portion is closed by the first bottom wall. A second member including the cylindrical first inner wall portion, and a holding mechanism that causes the first member to hold the second member. Each of the first member and the second member is manufactured by pressing.

  By comprising in this way, the 1st member and 2nd member which are comparatively simple shapes are each manufactured by press work, these are combined, and a 2nd member is hold | maintained to a 1st member with a holding mechanism Tappets can be manufactured. Therefore, the tappet can be configured inexpensively as a whole. In this case, since the outer wall portion that forms the outer diameter side of the peripheral wall is formed of a cylindrical member, the outer diameter surface is a smooth surface, and the inside of an opening hole provided in the housing, that is, a so-called guide hole. The possibility that the wall surface is worn can be reduced. Moreover, since the 1st member and the 2nd member are manufactured by press work, thickness reduction of each member can be performed easily. As a result, such a pump tappet has an inexpensive configuration and can achieve weight reduction.

  The holding mechanism includes a first recess recessed from the inner diameter surface of the outer wall portion toward the outer diameter side, a second recess recessed from the outer diameter surface of the first inner wall portion toward the inner diameter side, the first recess and the second recess. And a positioning pin fitted in the recess.

  Moreover, you may comprise the positioning pin so that it may be press-fitted in the 1st recessed part and the 2nd recessed part.

  The holding mechanism includes a first recess recessed from the inner diameter surface of the outer wall portion toward the outer diameter side, and a positioning protrusion that protrudes from the outer diameter surface of the first inner wall portion toward the outer diameter side and can be fitted into the first recess. Part may be included.

  Moreover, you may comprise the positioning protrusion part so that it may be formed by press work.

  Moreover, you may comprise a 1st recessed part so that the notch dented from the one end part side of the 1st member may be included.

  The first recess is a through-hole penetrating from the inner diameter surface of the outer wall portion toward the outer diameter surface, and the positioning protrusion or the positioning pin includes a protrusion portion protruding from the outer diameter surface of the outer wall portion. May be configured to be guided by the protrusion.

  Further, the holding mechanism may be configured to include a bent portion that is provided at an end portion on at least one side of the outer wall portion and is bent toward the inner diameter side.

  Further, when the second member is disposed on the inner diameter side of the first member, both end portions of the shaft may be configured to face the inner diameter surface of the outer wall portion.

  In addition, the holding mechanism is disposed on the inner diameter side of the first member and in a position in contact with the first bottom wall, and restricts the relative movement of the second member with respect to the first member. You may comprise so that a member may be included.

  The third member includes a cylindrical second inner wall portion having one end portion opened and the other end portion closed by the second bottom wall, and the holding mechanism is provided at both end portions of the outer wall portion. The second bottom wall of the third member may be in contact with the first bottom wall, including a bent portion that is bent toward the inner diameter side.

  In another aspect of the present invention, a high-pressure fuel pump includes a camshaft provided with a cam, a pump plunger that transmits the rotational motion of the camshaft provided with the cam as a reciprocating linear motion, and a pump plunger. In addition, a pump tappet that reciprocates linearly and a high-pressure chamber that makes the fuel high in pressure are provided. The pump tappet is provided with a shaft, a bearing provided on the outer diameter side of the shaft, a cam and a bearing that abuts on the outer diameter surface, a cylindrical peripheral wall and an intermediate bottom that partitions the inner space of the peripheral wall. And a housing case. The case is disposed on the inner diameter side of the first member including a cylindrical outer wall portion that is open at both ends, the one end portion is open, and the other end portion is closed by the first bottom wall. A second member including the cylindrical first inner wall portion, and a holding mechanism that causes the first member to hold the second member. Each of the first member and the second member is manufactured by pressing.

  Such a high-pressure fuel pump has an inexpensive configuration and can achieve a long life.

  In yet another aspect of the present invention, a motorcycle includes the above-described high-pressure fuel pump.

  Such a two-wheeled vehicle has an inexpensive configuration and can achieve a long life.

  In still another aspect of the present invention, an automobile includes the above-described high-pressure fuel pump.

  Such an automobile has an inexpensive configuration and can achieve a long life.

  By comprising in this way, the 1st member and 2nd member which are comparatively simple shapes are each manufactured by press work, these are combined, and a 2nd member is hold | maintained to a 1st member with a holding mechanism Tappets can be manufactured. Therefore, the tappet can be configured inexpensively as a whole. In this case, since the outer wall portion that forms the outer diameter side of the peripheral wall is formed of a cylindrical member, the outer diameter surface is a smooth surface, and the inside of an opening hole provided in the housing, that is, a so-called guide hole. The possibility that the wall surface is worn can be reduced. Moreover, since the 1st member and the 2nd member are manufactured by press work, thickness reduction of each member can be performed easily. As a result, such a pump tappet has an inexpensive configuration and can achieve weight reduction.

  Further, the high-pressure fuel pump, the two-wheeled vehicle, and the automobile to which such a tappet for a pump is applied have an inexpensive configuration and can achieve a long life.

It is a schematic sectional drawing which shows a part of high-pressure fuel pump containing the tappet which concerns on one Embodiment of this invention. It is a side view of the 1st member with which the case contained in the tappet which concerns on one Embodiment of this invention shown in FIG. It is the figure which looked at the 1st member shown in FIG. 2 from the direction opposite to the direction of arrow A ₂ in FIG. It is sectional drawing at the time of cut | disconnecting the 1st member shown in FIG. 2 in the cross section shown by IV-IV in FIG. It is the figure which looked at the 2nd member with which the case contained in the tappet which concerns on one Embodiment of this invention shown in FIG. 1 from the direction opposite to the direction of arrow A ₂ in FIG. It is sectional drawing at the time of cut | disconnecting the 2nd member shown in FIG. 5 in the cross section shown by VI-VI in FIG. It is sectional drawing at the time of cut | disconnecting the 2nd member shown in FIG. 5 in the cross section shown by VII-VII in FIG. It is sectional drawing of the positioning pin with which the case contained in the tappet which concerns on one Embodiment of this invention shown in FIG. 1 is equipped. It is sectional drawing which shows the state which has arrange | positioned the 2nd member to the internal-diameter side of the 1st member. It is sectional drawing which shows the state which penetrated the positioning pin through the 1st recessed part and the 2nd recessed part. The case shown in FIG. 10 is a view from the opposite direction of the arrow A _2. It is a figure which shows the tappet which concerns on other embodiment of this invention, and is a side view of the 1st member at the time of providing a notch in the 1st member. It is a figure which shows the tappet which concerns on other embodiment of this invention, and is the figure which looked at the tappet when the positioning protrusion part is provided in the 2nd member from the upper direction. It is a figure which shows the tappet which concerns on other embodiment of this invention, and is sectional drawing which shows the state which bent the one edge part side of the 1st member to the internal-diameter side. It is an expanded sectional view of the part shown by XV in FIG. It is sectional drawing which shows the tappet which concerns on further another embodiment of this invention, and shows the case where a 3rd member is included.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a part of a high-pressure fuel pump including a pump tappet according to an embodiment of the present invention. In the drawings shown below, from the viewpoint of easy understanding, illustration of some hatching of members such as a cross section of the roller is omitted. In the drawings shown below, the paper on the direction indicated by arrow A ₂ in FIG. 1 and the upper, and the paper surface under the direction indicated by the direction opposite to the direction of arrow A ₂ in Fig. 1 and lower, the up and down direction vertical The direction.

With reference to FIG. 1, first, the configuration of a high-pressure fuel pump including a tappet according to an embodiment of the present invention will be described. High-pressure fuel pump 11 comprising a tappet according to one embodiment of the present invention is provided a cam 12 on the outer diameter side, a cam shaft 13 for rotational movement in the direction of arrow A ₁ in FIG. 1, the cam 12, the rotational movement of the camshaft 13 is transmitted as a reciprocating linear motion to the pump plunger 14 (hereinafter simply referred to as “plunger”), and the tappet 31 that performs the reciprocating linear motion is in contact with the tappet 31. Plunger 14 as a rod-shaped member that performs reciprocating linear motion, a high-pressure chamber (not shown) that feeds fuel gas in accordance with the reciprocating linear motion of plunger 14, and a tappet 31 abuts against plunger 14. It includes a spring 15 provided so as to be disposed on the inner side, and a housing 16 that houses the tappet 31, the plunger 14, and the spring 15.

The tappet 31, the plunger 14, and the spring 15 are arranged so as to be accommodated in the opening hole 17 provided in the housing 16. Tappet 31, with the inner diameter surface 18 of the opening hole 17, the vertical direction in FIG. 1, i.e., is guided down the upper direction or vice versa indicated by the arrow A ₂ in Fig.

  The camshaft 13 and the tappet 31 are arranged so that the outer diameter surface 19 of the cam 12 and the outer diameter surface 22 of the outer ring 21 provided in the roller bearing 20 as a bearing included in the tappet 31 come into contact with each other. One end 23 of the plunger 14 is disposed so as to contact an intermediate bottom 34 provided in a case 32 included in the tappet 31. The spring 15 is arranged such that one end 24 thereof abuts on a spring seat 25 provided on the lower side of the intermediate bottom 34. The relative positional relationship between the spring seat 25 and the plunger 14 is regulated by a retaining ring 30 included in the high-pressure fuel pump 11.

The spring 15 has a downward direction, i.e., an elastic force to the opposite direction indicated by the arrow A ₂ in Fig. The tappet 31 is biased upward by the elastic force of the spring 15 through the plunger 14, that is, in the direction indicated by the arrow A ₂ in FIG.

Rotational motion of the cam shaft 13, bias of the spring 15, and by a guide or the like of the inner diameter surface 18 of the opening hole 17, tappet 31 and plunger 14 are vertically, i.e., in the direction or arrow A ₂ in FIG. 1 Performs a reciprocating linear motion in the opposite direction. The term reciprocating linear motion is a motion in the direction of direction or vice versa arrow A ₂ in Fig. Tappet 31, while the slope slightly, while being guided in the opening hole 17 provided in the housing 16, performs reciprocating linear motion in the direction of the direction or vice versa arrow A ₂ in Fig. When the camshaft 13 rotates at a high speed, the speed of the reciprocating linear motion of the tappet 31 and the plunger 14 also increases.

  The high pressure chamber is disposed on the other end side (not shown) of the plunger 14. The reciprocating linear motion of the plunger 14 can increase the pressure of the fuel supplied into the high pressure chamber.

  A concave groove 26 that is recessed toward the outer diameter side is provided in a part of the inner diameter surface 18 of the opening hole 17. The concave groove 26 has a shape that extends in the vertical direction and that receives a positioning pin, which will be described later.

  Next, the structure of the tappet 31 according to an embodiment of the present invention will be described. The tappet 31 includes a shaft 27, a roller bearing 20 that is disposed on the outer diameter side of the shaft 27 and abuts against the cam 12, a cylindrical peripheral wall 33, and an intermediate bottom 34 that partitions the internal space of the peripheral wall 33. And a case 32 that houses the roller bearing 20.

The roller bearing 20 is a bearing including a plurality of rollers 28 and an outer ring 21, and is a type that does not include a cage. That is, the roller bearing 20 is a full roller type roller bearing. Further, as described above, the outer diameter surface 22 of the outer ring 21 of the roller bearing 20 contacts the outer diameter surface 19 of the cam 12. The shaft 27 is rotatably supported by a part of the case 32. Shaft 27 rotates in the direction of arrow _{A 3} in FIG.

The inner space of the case 32, the partition in the lower space 35b located below the opposite direction indicated by the upper space 35a and a relatively arrow A ₂ located upward direction indicated by the relatively arrow A ₂ by the intermediate bottom 34 It has been. In the upper space 35a partitioned by the intermediate bottom 34, the shaft 27 and the roller bearing 20 described above are accommodated. Further, the case 32 accommodates the plunger 14 and a part of the spring 15, the spring seat 25, and the like in the lower space 35 b partitioned by the intermediate bottom 34.

  Here, the case 32 is disposed on the inner diameter side of the first member 36 including the cylindrical outer wall portion 37 that is open at both ends, the one end is open, and the other end is A second member 41 including a cylindrical first inner wall portion 42 closed by the first bottom wall 44 and a holding mechanism for causing the first member 36 to hold the second member 41 are provided.

Here, first, the configuration of the first member 36 will be described. FIG. 2 is a side view of the first member 36 provided in the case 32 included in the tappet 31 shown in FIG. 3, the first member 36 shown in FIG. 2, a view from the direction opposite arrow A ₂ in FIG. 1. 4 is a cross-sectional view of the first member 36 shown in FIG. 2 taken along the line IV-IV in FIG. FIG. 4 is a cross section of the cylindrical outer wall portion 37 to be described later cut along a plane passing through the center of the circle.

1 to 4, the first member 36 provided in the case 32 included in the tappet 31 includes a cylindrical outer wall portion 37 having openings at both ends. The outer wall portion 37 is cylindrical. The outer wall portion 37, the vertical direction, i.e., a shape extending straight in direction or reverse arrow A ₂ is a vertical direction on the paper of FIG. 2. The outer diameter of the outer wall portion 37 shown by the length L ₃ in FIG. 4, i.e., the diameter of the outer surface 38 of the outer wall 37, an opening provided in the housing 16 shown by the length L ₁ in FIG. 1 hole 17 , That is, approximately the same as the diameter of the inner diameter surface 18 of the opening hole 17. When the first member 36 is inserted into the opening hole 17, there is almost no radial gap between the outer diameter surface 38 of the outer wall portion 37 and the inner diameter surface 18 of the opening hole 17. The outer wall portion 37 constitutes a part of the peripheral wall 33.

A first recess 40 that is recessed from the inner diameter surface 39 of the outer wall portion 37 toward the outer diameter side is provided at a predetermined location of the outer wall portion 37. The first concave portion 40 is constituted by a first through hole penetrating from the inner diameter surface 39 to the outer diameter surface 38. The 1st recessed part 40 comprised by this 1st through-hole is round hole shape. The diameter of the round holes constituting the first recess 40 is indicated by the length L ₂ in FIG. The first recess 40 constitutes a part of a holding mechanism that causes the first member 36 to hold the second member 41.

Next, the configuration of the second member 41 will be described. 5, the second member 41 provided in the casing 32 included in the tappet 31 shown in FIG. 1, is a view seen from the direction opposite to the direction of arrow A ₂ in Fig. FIG. 6 is an end view when the second member 41 shown in FIG. 5 is cut along a cross section indicated by VI-VI in FIG. FIG. 7 is a cross-sectional view of the second member 41 shown in FIG. 5 cut along a cross section indicated by VII-VII in FIG. 6 and 7 show a cylindrical outer wall of the first member 36 when the second member 41 is arranged on the inner diameter side of the first member 36 as will be described later, similarly to FIG. 4 described above. It is a cross section at the time of cut | disconnecting in the surface which passes along the center of the circle of the part 37. FIG.

  Referring to FIGS. 1 to 7, the second member 41 provided in the case 32 included in the tappet 31 has a cylinder whose one end 43 a is open and whose other end 43 b is closed by a first bottom wall 44. A first inner wall portion 42 having a shape is included. The 2nd member 41 comprised by the 1st inner wall part 42 and the 1st bottom wall 44 is substantially U shape in the cross section shown in FIG.

  The first bottom wall 44 has a flat plate shape. The first bottom wall 44 is a portion corresponding to the intermediate bottom 34 described above when the tappet 31 is formed by combining the first member 36 and the second member 41 as described later. In other words, the first bottom wall 44 is a portion where the one end 23 of the plunger 14 abuts in the case 32. Further, the inner space formed by the first inner wall portion 42 and the first bottom wall 44 becomes an upper space 35 a that houses the shaft 27 and the roller bearing 20. On the other hand, the lower region of the first bottom wall 44 becomes the lower space 35b.

As shown in FIG. 5, the first inner wall portion 42 is composed of a pair of arc-shaped portions 45a and 45b rounded in an arc shape and a pair of flat portions 46a and 46b having a flat shape. The arc shape of the arc-shaped portions 45 a and 45 b is a shape that follows the shape of the cylindrical outer wall portion 37 constituting the first member 36. The arc-shaped portions 45a and 45b are provided so as to face each other at a 180 ° distance with the center 47 of the tappet 31 as a center point. A pair of flat portions 46a and 46b are also provided so as to face each other at 180 ° with the center 47 of the tappet 31 as the center point. That is, the first inner wall portion 42 is configured such that the pair of arcuate portions 45a and 45b and the pair of flat portions 46a and 46b face each other. A part of the first inner wall portion 42 constitutes a part of the peripheral wall 33. The center 47 of the tappet 31 as referred to herein, when viewed from above, i.e., when viewed tappet 31 from the direction opposite to the direction of arrow A ₂ in FIG. 1, constituting the first member 36 This corresponds to the center of the circle of the cylindrical outer wall portion 37.

The second member 41 is disposed on the inner diameter side of the first member 36 and on one end side. Arcuate portion 45a of the first inner wall portion 42 shown by the length L ₅ in FIG. 6, the outer diameter of 45b, the outer wall portion 37 constituting the first member 36 shown by the length L ₄ in FIG. 4 It is almost the same as the inner diameter. That is, when the second member 41 is disposed on the inner diameter side of the first member 36, the outer diameter surfaces 48a and 48b of the arc-shaped portions 45a and 45b of the first inner wall portion 42 and the first member 36 are connected. There is almost no radial gap between the outer wall portion 37 and the inner diameter surface 39. On the other hand, when the second member 41 is disposed on the inner diameter side of the first member 36, the outer diameter surfaces 49 a and 49 b of the flat portions 46 a and 46 b of the first inner wall portion 42 and the first member 36 are configured. A gap is formed between the outer wall portion 37 and the inner diameter surface 39. This gap will be described later.

The second member 41 accommodates the shaft 27 and the roller bearing 20. The shaft 27 is provided so as to be inserted through a pair of support holes 50a and 50b provided in the pair of flat portions 46a and 46b in the first inner wall portion 42, respectively. That is, the shaft 27 is supported by the pair of support holes 50a and 50b. In addition, about the support of this shaft 27, in the relationship between the outer diameter surface of the shaft 27 and the inner diameter surface of the support holes 50a and 50b, the gap may or may not be opened. In this case, if the shaft 27 is rotatably supported, the load load portion moves in the circumferential direction due to the rotation of the shaft 27, so that a long life can be achieved. Further, the rotation axis direction of the length of the shaft 27, i.e., one length from the end 29a to the other end portion 29b of the shaft 27 shown by the length L ₇ in Figure 5, the length in FIG. 5 L ₆ It is configured to be slightly longer than the distance between the pair of flat portions 46a and 46b. The shaft 27 is accommodated in a space 51 formed inside the first inner wall portion 42 except for portions protruding from the pair of flat portions 46a and 46b. In addition, a part of the outer ring 21 in the roller bearing 20, specifically, a portion disposed at a position opposite to the first bottom wall 44 in the vertical direction is formed inside the first inner wall portion 42. However, most of the other parts are accommodated in the space 51. In this case, at least the roller 28 provided in the roller bearing 20 is configured to be disposed in the space 51.

Incidentally, one length from the end 29a to the other end portion 29b of the shaft 27 shown by the length L ₇ of FIG. 5 is shorter than the inner diameter of the first member 36 shown by the length L ₄ in FIG. 4 It is configured. Specifically, when the second member 41 is disposed on the inner diameter side of the first member 36 with the shaft 27 supported by the support holes 50a and 50b, the first end 36 and the both ends 29a and 29b of the shaft 27 as each facing the inner surface 39 of the outer wall portion 37 constituting the member 36, the rotational axial length L ₇ of the shaft 27 is set. The difference obtained by subtracting the length L ₇ from the length L ₄ is the difference between the outer diameter surfaces 49 a and 49 b of the flat portions 46 a and 46 b of the first inner wall portion 42 and the outer wall portion 37 constituting the first member 36. This is the length of the gap between the inner diameter surface 39. This difference is preferably as small as possible. Since the inner diameter of the first member 36 indicated by the length L ₄ has a curvature, the range in which the shaft 27 can actually move is smaller than the difference value obtained by subtracting the length L ₇ from the length L _4. .

A second recess 53 that is recessed from the inner diameter surface 52 to the outer diameter side is provided at a predetermined location of one arcuate portion 45 a that constitutes the first inner wall portion 42. The second recess 53 is configured by a second through hole extending from the inner diameter surface 52 to the outer diameter surface 48a. The second concave portion 53 constituted by the second through hole is also in the shape of a round hole like the first concave portion 40 described above. Diameter of the round holes constituting the second concave portion 53 is indicated by the length L ₈ in FIG. The diameter of the first through hole forming the first recess 40 is the same as the diameter of the second through hole forming the second recess 53. That is, the length L ₈ shown in the length L ₂ and 6 shown in FIG. 4 is almost equal configuration. The second recess 53 constitutes a part of a holding mechanism that causes the first member 36 to hold the second member 41.

FIG. 8 is an enlarged sectional view of a positioning pin provided in a case 32 included in the tappet 31 shown in FIG. 1 to 8, the positioning pin 56 includes a hemispherical protrusion 57 and a columnar extension 59 that extends straight from the bottom surface 58 side of the hemispherical protrusion 57. The diameter of the extending portion 59 shown by the length L ₉ in FIG. 8 is configured shorter than the outer diameter of the hemispherical protrusion 57 shown by the length L ₁₀ in FIG. The diameter of the extending portion 59 is substantially equal to the diameter of the first through hole constituting the first recess 40 and the diameter of the second through hole constituting the second recess 53. . That is, the length L ₉ in FIG. 8, the length L _{4 in} FIG. _4, and the length L _{8 in} FIG. The positioning pin 56 constitutes a part of a holding mechanism that causes the first member 36 to hold the second member 41.

  FIG. 9 is a cross-sectional view showing a state in which the second member 41 is disposed on the inner diameter side of the first member 36. FIG. 9 corresponds to the cross section shown in FIG. 4 and FIG.

  1 to 9, the second member 41 is disposed on the inner diameter side of the first member 36. Specifically, the second member 41 is disposed on the one end side located on the upper side of the first member 36 constituted by the cylindrical outer wall portion 37. Here, as shown in FIG. 9, the first recess 40 is arranged so that the vertical position and the circumferential position of the first recess 40 coincide with the vertical position and the circumferential position of the second recess 53. The In this case, the inner diameter surface 39 of the outer wall portion 37 and the outer diameter surfaces 48a and 48b of the arc-shaped portions 45a and 45b of the first inner wall portion 42 are in substantially contact state.

Then, as shown in FIG. 10, the first concave portion 40 is aligned with the vertical position and the circumferential position of the first concave portion 40 so as to coincide with the vertical position and the circumferential position of the second concave portion 53. After the second member 41 is disposed on the inner diameter side of the member 36, as shown in FIG. 10, the positioning pin 56, specifically, the extending portion 59 provided in the positioning pin 56 is replaced with the first recess 40. Are inserted into the first through hole and the second through hole constituting the second recess 53. In this manner, the first member 36 and the second member 41 are combined, and the first member 36 is held on the second member 41 by the positioning pin 56, the first recess 40, and the second recess 53. Thus, a tappet 31 according to an embodiment of the present invention is configured. FIG. 10 is a cross-sectional view showing a state in which the positioning pin 56 is inserted into the first through hole constituting the first recess 40 and the second through hole constituting the second recess 53. Further, FIG. 11, the tappet 31 shown in FIG. 10, the upward direction, i.e., a view seen from an arrow A ₂ opposite to the direction in FIG. 10.

In this case, the length L ₉ indicating the diameter of the extension 59 forms the length L ₄ and the second recess 53 in FIG. 4 indicating the diameter of the first through-hole forming the first recess 40. 6 is configured to be almost equal to the length L ₈ in FIG. 6 showing the second through hole, and shorter than the length L ₁₀ indicating the outer diameter of the hemispherical protrusion 57, The second member 41 disposed on the inner diameter side of the first member 36 is appropriately held by the positioning pins 56. That is, the relative vertical movement and circumferential movement of the second member 41 with respect to the first member 36 are restricted.

  In such an insertion state of the positioning pin 56, the bottom surface 58 of the protruding portion 57 provided on the positioning pin 56 comes into contact with the outer diameter surface 38 of the outer wall portion 37. Here, the cylindrical peripheral wall 33 constituting the case 32 is constituted by a part of the outer wall part 37 constituting the first member 36 and the first inner wall part 42 constituting the second member 41, and the case 32. The intermediate bottom 34 that partitions the internal space of the peripheral wall 33 that constitutes the first wall 44 is constituted by the first bottom wall 44 that constitutes the second member 41. Specifically, the peripheral wall 33 on the upper space 35 a side partitioned by the intermediate bottom 34 is configured by the outer wall portion 37 and a part of the first inner wall portion 42, and the peripheral wall 33 on the lower space 35 b side is defined by the outer wall portion 37. Will be composed.

  Then, the tappet 31 including the case 32 formed in this way is inserted into the opening hole 17 of the housing 16. In this case, the tappet 31 is inserted into the opening hole 17 with the circumferential position of the concave groove 26 aligned with the circumferential position of the positioning pin 56. Since the concave groove 26 is recessed from the inner diameter surface 18 to the outer diameter side so as to extend in the vertical direction, the tappet 31 is allowed to move in the vertical direction. In this case, in the case 32, the upper region of the outer wall portion 37 and the first inner wall portion 42 constitute the peripheral wall 33 on the upper space 35a side, and the lower region of the outer wall portion 37 constitutes the peripheral wall 33 on the lower space 35b side. The first bottom wall 44 constitutes the intermediate bottom 34. Then, the plunger 14, the spring 15, etc. are arranged in the lower space 35 b of the case 32, and the cam 12 of the camshaft 13 is brought into contact with the outer diameter surface 22 of the outer ring 21, so that the high pressure fuel according to one embodiment of the present invention A pump 11 is formed.

  Here, the first member 36 is manufactured by press working. Specifically, a predetermined plate-shaped steel plate is formed into a cylindrical shape shown in FIG. And the 1st recessed part 40 comprised from a through-hole is provided in a predetermined location. In this case, after providing the 1st recessed part 40 comprised from a through-hole, you may decide to bend in the cylinder shape by press work.

  The second member 41 is also manufactured by pressing. Specifically, a predetermined plate-shaped steel plate is formed into a bottomed cylindrical shape shown in FIG. And the 2nd recessed part 53 comprised from a through-hole is provided in a predetermined location. In this case, after providing the 2nd recessed part 53 comprised from a through-hole, you may decide to bend and form in a bottomed cylindrical shape by press work.

  By comprising in this way, the 1st member 36 and the 2nd member 41 which are comparatively simple shapes are each manufactured by press work, these are combined, and the 2nd member 36 is made to the 1st member 36 with a holding mechanism. The tappet 31 can be manufactured by holding the member 41. Therefore, the tappet 31 can generally be configured at a low cost. In this case, since the outer wall portion 37 constituting the outer diameter side of the peripheral wall 33 is formed of a cylindrical member, the outer diameter surface 38 is a smooth surface, that is, the opening hole 17 provided in the housing 16, that is, The possibility that the inner diameter surface 18 of the so-called guide hole is worn can be reduced. Moreover, since the 1st member 36 and the 2nd member 41 are manufactured by press work, each member can be reduced in thickness easily. As a result, such a pump tappet 31 has an inexpensive configuration and can be reduced in weight.

  Further, such a high-pressure fuel pump 11 has an inexpensive configuration and can realize a long life.

  Also, a two-wheeled vehicle or a four-wheeled vehicle including such a high-pressure fuel pump 11 has an inexpensive configuration and can achieve a long life. Specifically, the high-pressure fuel pump 11 is provided in an engine of a motorcycle or an automobile. The high-pressure fuel pump converts the rotational motion of the camshaft provided with the cam into the reciprocating linear motion of the pump plunger, and sends the fuel gas by the reciprocating linear motion of the pump plunger to increase the pressure in the high-pressure chamber, Fuel is supplied by injection into the combustion chamber.

In this case, as shown in FIG. 11, the inner diameter of the first inner surface 39 of the outer wall portion 37 constituting the member 36 shown by a length L ₄ are, the rotation axis direction of the length of the shaft 27, i.e., It is configured shorter than the length to the other end portion 29b from one end portion 29a of the shaft 27 shown by the length L ₇ in FIG. That is, when the second member 41 is disposed on the inner diameter side of the first member 36, both end portions 29a and 29b of the shaft 27 are respectively connected to the inner diameter surface 39 of the outer wall portion 37 constituting the first member 36. It is the structure which has opposed. Then, when the second member 41 is disposed on the inner diameter side of the first member 36, the movement of the shaft 27 in the rotation axis direction is restricted by the inner diameter surface 39 of the outer wall portion 37. , 50b will not fall out. Therefore, after inserting the shaft 27 into the support holes 50a and 50b, it is not necessary to caulk both ends 29a and 29b of the shaft 27 in order to prevent the shaft 27 from coming off. As a result, the number of steps for manufacturing the tappet 31 can be reduced, and the tappet 31 can be configured at a lower cost. In addition, it is possible to prevent bulging or deformation of the outer wall portion 37 when the outer wall portion 37 is fixed during caulking, and to maintain high accuracy in manufacturing, such as the roundness of the cylindrical shape of the outer wall portion 37. Further, when caulking the both end portions 29a and 29b of the shaft 27, it is necessary to make the central portion of the shaft 27 where the roller rolls have high hardness and the end portion to be caulked to have low hardness. In many cases, high-frequency heat treatment is performed, but heat treatment such as high-frequency heat treatment can be omitted, and a shaft whose entire surface is hardened such as quenching and tempering can be applied. Therefore, further cost reduction can be achieved.

In addition, in said embodiment, it is good also as a structure which press-fits the extension part of a positioning pin. Namely, the diameter of the extending portion indicated by the length L _9, a second recess indicated by the first diameter of the through hole and the length L _8, constituting the first recess represented by a length L ₂ Is slightly larger than the diameter of the second through-hole. By doing so, the second member can be firmly held by the first member by press-fitting the positioning pin into the first and second recesses.

  In the above embodiment, a plurality of holding mechanisms including the first and second recesses and the positioning pins may be provided. By carrying out like this, a 2nd member can be hold | maintained to a 1st member more reliably.

  In the above embodiment, the positioning pin is provided with the hemispherical protrusion, but is not limited to such a shape, and may be a shape protruding in a rectangular shape. That is, the portion constituting the convex portion may be a rectangular parallelepiped, a cube, or a semicylindrical shape. Furthermore, other shapes may be used.

Incidentally, in the above embodiment, the positioning by the positioning pin, has been the one plant cylindrical extending portion represented by a diameter L _9, not limited thereto, and may be a plurality of locations. Also, the cross-sectional shape may be other shapes such as a triangle, a rectangle, an ellipse and the like. As a matter of course, the shape of the case also changes depending on the shape of the positioning pin.

  In the above embodiment, the first recess is a through-hole penetrating the outer wall portion so as to reach the outer diameter side from the inner diameter side of the outer wall portion. The shape may have a bottom that is recessed from the inner diameter surface of the outer wall portion toward the outer diameter side so as to receive the positioning pin. In addition, the second concave portion is also defined as a through-hole penetrating the inner wall portion from the inner diameter side to the outer diameter side of the inner wall portion. However, the present invention is not limited to this, and the inner wall portion may not be penetrated. A shape having a bottom recessed from the outer diameter surface of the inner wall portion toward the inner diameter side so as to receive the positioning pin may be used. In this case, the positioning pin is accommodated in and embedded in the first recess and the second recess. That is, what is necessary is just to employ | adopt what is comprised only from the extension part, without including the above-mentioned protrusion part as a positioning pin.

  Moreover, in said embodiment, as a 1st recessed part, a notch is provided from the one end part side of the outer wall part which forms a cylindrical shape to the predetermined location of the other end part side, and this is made into a 1st recessed part. You may decide.

  FIG. 12 is a side view showing the case in this case. Referring to FIG. 12, a case 61 included in a tappet according to another embodiment of the present invention includes a first member 62 configured by an outer wall portion 64, a second member 63 including a roller bearing 65, A positioning pin 66 is provided as a holding mechanism for holding the second member 63 on the first member 62. The basic configuration of the members constituting the case, such as the first member 62 and the second member 63, is the same as that shown in FIG.

  As a main difference portion, as shown in FIG. 12, the protruding portion of the positioning pin 66 has a rectangular shape. The first member 62 is a cut extending from one end 67a side where the roller bearing 65 of the outer wall 64 constituting the first member 62 is disposed to a predetermined location on the other end 67b side. A notch 68 is provided. The notch 68 is provided so as to extend straight in the vertical direction. The notch 68 constitutes a first recess as a holding mechanism and allows the positioning pin 66 to be fitted. You may decide to comprise in this way.

Thus, it is possible to regulate the movement direction of the upper shown in relative circumferential movement and arrow A ₂ in FIG. 12 of the second member 63 relative to the first member 62. The notch 68 in this case slides with the portion corresponding to the groove 26 when the tappet including the case 61 is accommodated in the opening hole 17 of the housing 16. The inner diameter surface 18 is not worn by sliding.

  In the above embodiment, the positioning pin is configured as a member separate from the first and second members. However, the positioning pin is not limited to this, and is configured using a part of the second member. It is good. FIG. 13 is a cross-sectional view of the case in this case, and is a cross-sectional view when the case is cut in a direction perpendicular to the vertical direction.

  Referring to FIG. 13, a case 71 included in a tappet according to still another embodiment of the present invention includes a first member 72 including an outer wall portion 74 and a second member including a first inner wall portion 75. Member 73. Case 71 includes shaft 76a and roller bearing 76b. Since the basic components included in the case, such as the first member 72 and the second member 73, are the same as those shown in FIG.

  As a main difference portion, an inner wall projecting portion 78 projecting to the outer diameter side is provided in a part of one arc-shaped portion 77 a of the first inner wall portion 75. You may decide to comprise in this way.

  By doing so, it is possible to omit the number of members constituting the case and, in turn, the tappet. Specifically, the positioning pin in the embodiment shown in FIG. 9 described above can be omitted. Further, the second member 73 can be reliably held with respect to the first member 72. In this case, the inner wall projecting portion 78 may be formed by bonding or adhering to the outer diameter side of the first inner wall portion 75 of the second member 73 by preparing another member. The part 78 may also be formed by press working. That is, in the step of forming the first inner wall portion 75 and the first bottom wall when manufacturing the second member 73, the inner wall protruding portion 78 is formed. By doing so, the manufacturing process becomes easier.

  In this case, if it is set as the structure which provides a notch in the outer wall part shown in above-mentioned FIG. 12, the inner wall protrusion part shown in FIG. 13 can be easily fitted to the notch shown in FIG. That is, when the second member is disposed on the inner diameter side of the first member, the inner wall protruding portion can be inserted and fitted along the notch.

  In the above-described embodiment, the holding mechanism uses the first concave portion, the second concave portion, the positioning pin, and the like. However, the present invention is not limited to this, and other methods may be adopted. FIG. 14 is a cross-sectional view showing the case in this case. FIG. 15 is an enlarged cross-sectional view of a region indicated by XV in FIG.

  Referring to FIGS. 14 and 15, a case 81 included in a tappet according to still another embodiment of the present invention includes a first member 82 including an outer wall portion 84, a first inner wall portion 85 a, It includes a second member 83 composed of one bottom wall 85b and a protrusion 86 as a holding mechanism. The case 81 includes a shaft 87a and a bearing 87b. The basic configuration of the members constituting the case, such as the first member 82 and the second member 83, is the same as that shown in FIG.

  The main difference is that the outer wall portion 84 includes a bent portion 89 as a holding mechanism that is bent toward the inner diameter side on the end portion 88a side on which the second member 83 on one side is accommodated. It is a configuration. The bending angle of the bending portion 89 is arbitrarily determined. In this case, the second member 83 may be arranged on the inner diameter side of the first member 82 and then the one end portion 88a which becomes the opening side of the outer wall portion 84 may be bent to the inner diameter side. Before the member 83 is disposed on the inner diameter side of the first member 82, a bent portion 89 is formed, and the bent portion 89 is overcome by utilizing a slight elastic deformation of the bent portion 89 toward the outer diameter side. The second member 83 may be disposed on the inner diameter side of the first member 82. Further, after the bent portion 89 is formed, the second member 83 may be press-fitted and disposed on the inner diameter side of the first member 82.

With such a configuration, even if the second member 83 disposed on the inner diameter side of the first member 82 attempts to move upward, the end portion 88b on the opening side of the inner wall portion 85a of the second member 83. However, it is caught by the bent part 89 bent to the inner diameter side, and the upward movement of the second member 83 is restricted. That is, the bent portion 89 operates as a holding mechanism that causes the first member 82 to hold the second member 83. In addition, in combination with the case where the above-described notch is provided, the vertical movement of the second member 83 relative to the first member 82 may be restricted. That is, for the movement of the second member in the upward direction indicated by arrow A _2, regulated by the bent portion, the movement of the second member in the downward direction opposite of arrow A _2, notches Further, it may be restricted by the protruding portion.

  In this case, the bent portion may be provided over the entire circumference of the cylindrical outer wall portion, or may be provided in a part of the cylindrical outer wall portion, that is, partially. Furthermore, for example, a plurality of bent portions may be provided at equal intervals.

  Further, as the holding mechanism, a configuration may be adopted in which the second member is press-fitted into the inner diameter of the first member and both are fixed.

  In addition, the holding mechanism included in the case is disposed on the inner diameter side of the first member and in contact with the first bottom wall, and restricts relative movement of the second member with respect to the first member. You may comprise so that the 3rd member to do may be included. FIG. 16 is a cross-sectional view showing the case in this case.

  Referring to FIG. 16, a case 91 included in a tappet according to still another embodiment of the present invention includes a first member 92 composed of an outer wall portion 94a, a first inner wall portion 95a, and a first bottom. A second member 93 composed of the wall 95b and a protruding portion 96a as a holding mechanism are included. The case 91 includes a shaft 96b and a bearing 96c. The basic configuration of the members constituting the case, such as the first member 92 and the second member 93, is the same as that shown in FIG.

  The main difference is that the case 91 is disposed on the inner diameter side of the first member 92 at a position where it abuts against the first bottom wall 95b, and the second member 93 is relative to the first member 92. A third member 97a for restricting the movement. The third member 97a includes a cylindrical second inner wall 97c having one end opened and the other end closed by a second bottom wall 97b. The holding mechanism includes bent portions 94b and 94c that are provided at both end portions of the outer wall portion 94a and are bent toward the inner diameter side. And the 2nd bottom wall 97b contacts the 1st bottom wall 95b among the 3rd members 97a. The third member 97a constituted by the second inner wall portion 97c and the second bottom wall 97b is substantially U-shaped in the cross section shown in FIG. Such a configuration may be adopted.

  That is, among the second bottom wall 97b of the third member 97a, the third member 97a side of the surface 97d facing the second member 93 side and the first bottom wall 95b of the second member 93 The surface 95c that faces the surface is in contact. Then, in the third member 97a, the downward movement of the end portion 97e of the second inner wall portion 97c is performed by the bent portion 94c of the outer wall portion 94a corresponding to the end portion on the side where the third member 97a is disposed. Thus, the downward movement of the second member 93 is restricted. Even if the second member 93 tries to move upward, the end 97f of the first inner wall portion 95a of the second member 93 is caught by the bent portion 94b, and the upward movement is restricted.

  In this case, the space formed by the first inner wall portion 95a and the first bottom wall 95b constituting the second member 93 becomes the upper space 98a in which the shaft 96b and the roller bearing 96c are accommodated, and the third member. A space formed by the second inner wall portion 97c and the second bottom wall 97b constituting 97a is a lower space 98b in which a plunger or the like (not shown) is accommodated. Further, the peripheral wall constituting the case is constituted by the outer wall portion 94a and the first inner wall portion 95a on the upper space 98a side, and is constituted by the outer wall portion 94a and the second inner wall portion 97c on the lower space 98b side. The intermediate bottom is constituted by the first bottom wall 95b and the second bottom wall 97b.

  This also makes it possible for the first member to hold the second member. In this case, since the intermediate bottom can have a double structure of the first bottom wall and the second bottom wall, the strength of the portion corresponding to the intermediate bottom can be improved.

  In this case, the third member can also be manufactured by pressing. By carrying out like this, a 3rd member can be manufactured at low cost.

  In addition, about the 3rd member, it may not be the above-mentioned shape, For example, the disk-shaped member which has predetermined | prescribed board thickness may be sufficient, and another shape may be sufficient as it.

  In the above embodiment, the full roller type roller bearing is adopted as the member that comes into contact with the cam. However, the present invention is not limited to this. For example, a roller bearing with a cage may be used. Further, it may be a sliding bearing which does not include a roller and includes only a shaft and an outer ring.

  In the above embodiment, the first member and the second member manufactured by pressing may be manufactured by deep drawing using a press, for example. Briefly, a flat steel plate is prepared, and this steel plate is deep-drawn into a bottomed cup shape. Then, the upper edge part made into cup shape is cut off, and the 2nd member of the shape which has the bottom wall which one end part opened and the other end part closed can be manufactured. Moreover, it shape | molds so that it may open also about the bottom wall of this cup-shaped member, and the cylindrical 1st member with which both ends opened can be manufactured. In this case, you may decide to manufacture by a continuous process using a transfer press.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The pump tappet according to the present invention, and the high-pressure fuel pump, the two-wheeled vehicle, and the automobile to which the pump tappet is applied are effectively used when an inexpensive configuration and weight reduction are required.

  11 High Pressure Fuel Pump, 12 Cam, 13 Cam Shaft, 14 Plunger, 15 Spring, 16 Housing, 17 Opening Hole, 18, 39, 52 Inner Diameter Surface, 19, 22, 38, 48a, 48b, 49a, 49b Outer Diameter Surface 20, 65, 76b, 87b, 96c roller bearing, 21 outer ring, 23, 24, 29a, 29b, 43a, 43b, 67a, 67b, 88a, 88b, 97e, 97f end, 25 spring seat, 26 concave groove, 27, 76a, 87a, 96b Shaft, 28 rollers, 30 retaining ring, 31 tappet, 32, 61, 71, 81, 91 case, 33 peripheral wall, 34 intermediate bottom, 35a, 35b, 51, 98a, 98b space, 36, 62, 72, 82, 92 1st member, 37, 64, 74, 84, 94a Outer wall part, 40 1st recessed part, 41, 6 73, 83, 93 Second member, 42, 75, 85a, 95a First inner wall portion, 44, 85b, 95b First bottom wall, 45a, 45b, 77a Arc-shaped portion, 46a, 46b Flat portion, 47 Center, 50a, 50b Support hole, 53 Second recess, 56, 66 Positioning pin, 57 Projection, 58 Bottom, 59 Extension, 68 Notch, 78 Inner wall projection, 86, 96a Projection, 89 , 94b, 94c bent portion, 95c, 97d surface, 97a third member, 97b second bottom wall, 97c second inner wall portion.

Claims (12)

A pump tappet that transmits the rotational motion of a camshaft provided with a cam as a reciprocating linear motion to a pump plunger, and performs a reciprocating linear motion together with the pump plunger,
A shaft, a bearing provided on the outer diameter side of the shaft, abutting on the cam and the outer diameter surface thereof, a cylindrical peripheral wall and an intermediate bottom partitioning the internal space of the peripheral wall, the shaft and the bearing; Including a housing case,
The case is disposed on the inner diameter side of the first member including a cylindrical outer wall portion having both ends opened, and one end portion is open and the other end portion is a first bottom wall. A second member including the cylindrical first inner wall portion closed by the first member, and a holding mechanism for holding the second member in the first member,
Each of the first member and the second member is a pump tappet manufactured by press working. The holding mechanism includes a first recess recessed from the inner diameter surface of the outer wall portion toward the outer diameter side, a second recess recessed from the outer diameter surface of the first inner wall portion toward the inner diameter side, the first recess and The pump tappet according to claim 1, further comprising a positioning pin fitted in the second recess. The pump tappet according to claim 2, wherein the positioning pin is press-fitted into the first recess and the second recess. The holding mechanism protrudes from the outer diameter surface of the first inner wall portion to the outer diameter side and can be fitted into the first recess portion. The tappet for pumps in any one of Claims 1-3 containing a positioning protrusion part. The pump tappet according to claim 4, wherein the positioning protrusion is formed by pressing. The pump tappet according to any one of claims 2 to 5, wherein the first recess includes a notch that is recessed from one end side of the first member. The first recess is a through-hole penetrating from the inner diameter surface of the outer wall portion toward the outer diameter surface,
The positioning protrusion or the positioning pin includes a protrusion protruding from the outer diameter surface of the outer wall,
The pump tappet according to any one of claims 4 to 6, wherein the case is guided by the protrusion. The pump tappet according to claim 1, wherein the holding mechanism includes a bent portion that is provided at an end portion on at least one side of the outer wall portion and is bent toward the inner diameter side. When the second member is disposed on the inner diameter side of the first member, both end portions of the shaft are opposed to the inner diameter surface of the outer wall portion, respectively. The pump tappet as described. The holding mechanism is disposed on the inner diameter side of the first member and in a position in contact with the first bottom wall, and restricts relative movement of the second member with respect to the first member. The tappet for pumps in any one of Claims 1-9 containing a 3rd member. The third member includes a cylindrical second inner wall having one end opened and the other end closed by a second bottom wall,
The holding mechanism includes a bent portion provided at both ends of the outer wall portion and bent toward the inner diameter side,
The pump tappet according to claim 10, wherein, of the third member, the second bottom wall abuts on the first bottom wall. A camshaft provided with a cam; a pump plunger that transmits the rotational motion of the camshaft provided with the cam as a reciprocating linear motion; a pump tappet that performs a reciprocating linear motion together with the pump plunger; A high-pressure fuel pump comprising a high-pressure chamber for making the fuel high pressure inside,
The pump tappet includes a shaft, a bearing provided on the outer diameter side of the shaft, abutting the cam and the outer diameter surface thereof, and a cylindrical peripheral wall and an intermediate bottom that partitions the inner space of the peripheral wall, A housing for housing the shaft and the bearing,
The case is disposed on the inner diameter side of the first member including a cylindrical outer wall portion having both ends opened, and one end portion is open and the other end portion is a first bottom wall. A second member including the cylindrical first inner wall portion closed by the first member, and a holding mechanism for holding the second member in the first member,
Each of the first member and the second member is a high-pressure fuel pump manufactured by pressing.

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