JP2009293641A - Tappet for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tappet for a pump that can be manufactured inexpensively. <P>SOLUTION: The tappet 21 for the pump comprises a shaft 22, a roller bearing 31 arranged at the outside diameter side of the shaft 22 and rotatably supported on the shaft 22, a case 23 storing the shaft 22 and the roller bearing 31 and having a through-hole 23i as a recess in the outside diameter surface 23h, and a cylindrical positioning pin 24 positioning the case 23 and having a part inserted into the through-hole 23i so as to project from the outside diameter surface 23h. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pump tappet, and more particularly to a pump tappet including a roller bearing.

  Some engines such as automobiles are provided with a high-pressure pump that injects fuel at a high pressure. The high-pressure pump converts the rotational movement of the camshaft provided with the cam into the reciprocating linear movement of the pump plunger, sends the gas by the reciprocating linear movement of the pump plunger, increases the pressure in the high-pressure chamber, and injects it into the fuel chamber And supply fuel. As a constituent member of the high-pressure 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 a roller-containing tappet including rollers and a mushroom-shaped tappet, depending on the shape of the contact portion with the cam.

  Here, a technique related to a tappet for a pump including a roller bearing is disclosed in DE 10 2005 047 234 A1 (Patent Document 1). FIG. 16 is a cross-sectional view of the pump tappet shown in Patent Document 1. Referring to FIG. 16, a tappet as a roller push rod 101 shown in Patent Document 1 has a push rod housing 102 and a push rod roller 103 (roller bearing) fixed to this and supported by a needle. . The roller push rod 101 is driven by a three-stage cam 105 of a cam shaft 104 that rotates clockwise. At the same time, the roller push rod 101 is guided in the push rod guide hole 106 in the axial direction indicated by the arrow XVI in FIG. 16, and drives a pump plunger 107 of a fuel high pressure pump (not shown).

The push rod roller 103 includes an outer ring 108 that contacts the three-stage cam 105, a shaft 109 disposed on the inner diameter side of the outer ring 108, and a plurality of needle rollers 110 disposed between the outer ring 108 and the shaft 109. The push rod roller 103 is a full roller type, that is, a type in which only a plurality of needle rollers 110 are disposed between the outer ring 108 and the shaft 109.
DE 10 2005 047 234 A1

  According to Patent Document 1, the push rod housing 102 as a case is restricted from rotating in the circumferential direction by a guide pin 111. Here, according to Patent Document 1, the guide pin 111 has a mushroom cross section. Such a guide pin 111 has a complicated shape and cannot be easily manufactured. Then, the pump tappet cannot be manufactured at low cost.

  An object of the present invention is to provide a pump tappet that can be manufactured at low cost.

  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 includes a shaft, a roller bearing disposed on the outer diameter side of the shaft and rotatably supported on the shaft, a case that accommodates the shaft and the roller bearing, and a recess provided on the outer diameter surface thereof. And a cylindrical positioning pin which is fitted into the recess so that a part thereof protrudes from the outer diameter surface and positions the case. The roller bearing includes an outer ring that contacts the cam and a plurality of rollers disposed between the outer ring and the shaft.

  Thus, by making the shape of the positioning pin for positioning the case into a columnar shape, the outer shape can be simplified and easily manufactured. Accordingly, a pump tappet including such a positioning pin can be manufactured at low cost.

  Preferably, the recess has a shape recessed from the outer diameter surface of the case along the outer diameter surface of the positioning pin. By doing so, the positioning pin and the recess can be more reliably fitted together by aligning the outer diameter surface of the positioning pin and the recess of the case.

  More preferably, the positioning pin is press-fitted and fixed in the recess. By doing so, the possibility that the positioning pin falls off from the recess provided in the case can be greatly reduced.

  More preferably, a plurality of recesses and positioning pins are provided. By doing so, the movement of the pump tappet in the circumferential direction can be more reliably and appropriately regulated.

  More preferably, the roller bearing includes a cage that holds the roller. In the full-roller type bearing described in Patent Document 1, the position of the roller in the bearing is not stable during high-speed rotation, and roller skew occurs. Due to the skew of the rollers, the rollers push the roller bearings in the lateral direction, that is, in the axial direction of the shaft 109 which is the front and back direction in FIG. Due to such lateral running of the roller bearing, there is a possibility that the end of the roller bearing becomes poorly lubricated between the roller bearing and the housing, or the roller bearing is worn.

  However, in this way, in the roller bearing that is a constituent member of the pump tappet, the position of the roller in the roller bearing during high-speed rotation can be stabilized by the cage. If it does so, the skew of a roller can be suppressed and the side running of a roller bearing can be prevented. Therefore, it is possible to reduce the risk of poor lubrication of the roller bearing and wear of the roller bearing during high-speed rotation. As a result, the life of the pump tappet can be extended. That is, such a pump tappet can be manufactured at a low cost and can have a long life.

  Thus, by making the shape of the positioning pin cylindrical, its outer shape can be simplified and can be easily manufactured. Such a positioning pin is fitted into the recess and attached to the case. Accordingly, a pump tappet including such a positioning pin can be manufactured at low cost.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a part of a high-pressure pump including a pump tappet (hereinafter simply referred to as “tappet”) according to an embodiment of the present invention. 2 and 3 are sectional views of tappets included in the high-pressure pump shown in FIG. FIG. 4 is a schematic perspective view of the tappet shown in FIGS. 2 and 3. FIG. 5 is a view of the tappet shown in FIG. 4 as viewed from the direction of the arrow V in FIG. 6 is a view of the tappet shown in FIG. 4 as viewed from the direction of the arrow VI in FIG. 7 is a view of the tappet shown in FIG. 4 as viewed from the direction of arrow VII in FIG. 8 is a view of the tappet shown in FIG. 4 as viewed from the direction of arrow VIII in FIG. 2 corresponds to the II-II cross section shown in FIG. 5, and FIG. 3 corresponds to the III-III cross section shown in FIG. In addition, in the figure shown below, illustration of hatching of the cross section of a roller is abbreviate | omitted from a viewpoint of easy understanding.

  With reference to FIGS. 1-8, the structure of the high pressure pump containing the tappet which concerns on one Embodiment of this invention is demonstrated first. A high pressure pump 11 including a tappet according to an embodiment of the present invention has a cam 12a provided on the outer diameter side thereof, a camshaft 12 that rotates in the direction of arrow A in FIG. The tappet 21 that abuts and transmits the rotary motion of the camshaft 12 as a reciprocating linear motion to the pump plunger 13 (hereinafter simply referred to as “plunger”) and performs the reciprocating linear motion, and the reciprocating linear motion abutting the tappet 21. A plunger 13 as a rod-shaped member that moves, a high-pressure chamber (not shown) that feeds gas in accordance with the reciprocating linear motion of the plunger 13, abuts against the tappet 21, and moves the plunger 13 inward. And a housing 15 that houses the tappet 21, the plunger 13, and the spring 14.

  The tappet 21, the plunger 13, and the spring 14 are arranged so as to be accommodated in the opening hole 16 provided in the housing 15. The tappet 21 is guided by the inner diameter surface 16a of the opening hole 16 in the vertical direction in FIG. 1, that is, in the direction of the arrow I in FIG.

  The camshaft 12 and the tappet 21 are arranged so that the outer diameter surface 12b of the cam 12a and the outer diameter surface 32a of the outer ring 32 provided in the roller bearing 31 included in the tappet 21 abut. One end 13 a of the plunger 13 is disposed so as to abut on an intermediate bottom 23 c provided in a case 23 included in the tappet 21. The spring 14 is disposed such that one end portion 14a thereof abuts against a spring seat 17 provided on the lower side of the intermediate bottom 23c.

  The spring 14 has an elastic force in the downward direction, that is, in the direction opposite to the direction indicated by the arrow I in FIG. The tappet 21 is urged upward by the elastic force of the spring 14 through the plunger 13, that is, in the direction indicated by the arrow I in FIG. 1.

  The tappet 21 and the plunger 13 are moved in the vertical direction, that is, in the direction of the arrow I in FIG. 1 or vice versa, by the rotational movement of the camshaft 12, the urging of the spring 14, and the guide of the inner diameter surface 16a of the opening hole 16. Reciprocating linear motion in the direction of. The reciprocating linear motion here is a motion in the direction of arrow I in FIG. 1 or in the opposite direction. The tappet 21 performs a reciprocating linear motion in the direction of the arrow I in FIG. When the camshaft 12 rotates at a high speed, the speed of the reciprocating linear motion of the tappet 21 and the plunger 13 also increases.

  The high pressure chamber is disposed on the other end side (not shown) of the plunger 13. The reciprocating linear motion of the plunger 13 can increase the pressure of the fuel supplied to the high pressure chamber.

  Next, the configuration of the tappet 21 according to an embodiment of the present invention will be described. The tappet 21 includes a shaft 22, a roller bearing 31 that is disposed on the outer diameter side of the shaft 22 and is rotatably supported on the shaft 22, and a case 23 that houses the shaft 22 and the roller bearing 31.

  The case 23 includes a cylindrical peripheral wall 23a and an intermediate bottom 23c provided at an intermediate position of the inner diameter surface 23b of the peripheral wall 23a so as to partition the space in the vertical direction. Of the case 23, the intermediate bottom 23 c is in contact with the plunger 13. The peripheral wall 23a and the intermediate bottom 23c have a predetermined thickness.

  A pair of support holes 23d and 23e that support the shaft 22 are provided on one end side of the peripheral wall 23a. The shaft 22 is arranged so that the shaft 22 is inserted into the pair of support holes 23d and 23e. A roller bearing 31 is disposed on the outer diameter side of the shaft 22. Thus, the case 23 accommodates the shaft 22 and the roller bearing 31 in the space 23f from the intermediate bottom 23c toward the one end side of the peripheral wall 23a.

  A part of the plunger 13 is accommodated in the space 23g from the intermediate bottom 23c toward the other end side of the peripheral wall 23a. Specifically, the one end portion 13a of the plunger 13 is disposed so as to contact the central portion in the radial direction of the intermediate bottom 23c, and the one end portion 13a of the plunger 13 is accommodated. The one end portion 14a of the spring 14 is also accommodated in the space 23g.

  The middle bottom 23c is provided with four oil holes 25 penetrating in the thickness direction (see FIGS. 7 and 8). The four oil holes 25 are provided so as to avoid a contact portion between the one end portion 13a of the plunger 13 and the intermediate bottom 23c. By using this oil hole 25, the lubricating oil supplied to the tappet 21 can be passed between the space 23f and the space 23g.

  The case 23 is provided with a through hole 23i as a recess that penetrates from the outer diameter surface 23h to the inner diameter surface 23b of the peripheral wall 23a. A positioning pin 24 is fitted into the through hole 23i so that a part thereof protrudes from the outer diameter surface 23h. The positioning pin 24 positions the tappet 21 disposed in the opening hole 16. That is, the tappet 21 includes a positioning pin 24 that positions the case 23. The positioning of the case 23 will be described later.

  FIG. 9 is a perspective view of the positioning pin 24. FIG. 10 is a diagram showing a fitting state of the positioning pin 24, and corresponds to a part of the XX cross section shown in FIG. With reference to FIGS. 1-10, the positioning pin 24 is a cylindrical member extended in the direction shown by the arrow B in FIG. 9, and the external shape of a cross section becomes a circle (refer FIG. 10). Note that this circle does not have to be a perfect circle. Among the positioning pins 24, chamfers 24b such as C chamfering and R chamfering are provided at corners of the end surface 24a located on both sides in the longitudinal direction of the outer diameter surface 24c formed of a curved surface. Thus, by making the shape of the positioning pin 24 cylindrical, the outer shape can be simplified and can be easily manufactured. Therefore, the tappet 21 including such a positioning pin 24 can be manufactured at low cost.

  As described above, the positioning pin 24 is configured such that a part thereof protrudes from the outer diameter surface 23h when fitted into the through hole 23i. Here, the positioning pin 24 is press-fitted and fixed in a through hole 23i as a recess. By doing so, the possibility that the positioning pin 24 drops off from the through hole 23i as a recess provided in the case 23 can be greatly reduced.

  A concave groove 16b extending in the direction of arrow I in FIG. 1 is provided on the inner diameter surface 16a of the opening hole 16 of the housing 15 so as to be recessed from the inner diameter surface 16a. When the tappet 21 is accommodated in the opening hole 16, the protruding portion of the positioning pin 24 is fitted into the concave groove 16b. Thereby, the case 23 in the opening hole 16, and the positioning of the tappet 21 in the circumferential direction is performed. Thereby, rotation to the circumferential direction of the tappet 21 in the opening hole 16 can be prevented.

  Next, the configuration of the roller bearing 31 included in the tappet 21 will be described. FIG. 11 is an enlarged view of a portion indicated by XI of a two-dot chain line in FIG. A roller pitch circle 31a is indicated by a one-dot chain line in FIG. FIG. 12 is a view of a part of the roller bearing 31 seen from the direction of the arrow XII shown in FIG. 13 is a cross-sectional view showing a part of the roller bearing 31, and is a cross-section XIII-XIII in FIG. 1 to 13, the roller bearing 31 includes an outer ring 32, a plurality of rollers 33 disposed between the outer ring 32 and the shaft 22, and a cage 34 that holds the plurality of rollers 33. .

  The retainer 34 includes a pair of annular portions 34 a and 34 b and a plurality of column portions 34 d that connect the pair of annular portions 34 a and 34 b so as to form a pocket 34 c that accommodates the rollers 33. The column portion 34d has a shape that extends straight in the axial direction, that is, in the cross section shown in FIG.

  Similar to the rollers 33, the retainer 34 is disposed between the outer ring 32 and the shaft 22. The plurality of rollers 33 are accommodated and held in the respective pockets 34 c provided in the cage 34. The retainer 34 is configured such that the outer diameter guide, that is, the inner diameter surface 32 b of the outer ring 32 disposed on the outer diameter side of the retainer 34 and the outer diameter surface 34 e of the retainer 34 are in radial contact. Further, the retainer 34 is provided with an oil groove 34f so as to be recessed inward from the outer diameter surface 34e. The oil groove 34f is provided at the center of the column portion 34d and has a shape extending in the circumferential direction.

  Due to the rotational movement of the camshaft 12, the outer ring 32 and the rollers 33, which are constituent members of the roller bearing 31, are also rotated. When the camshaft 12 rotates at a high speed, the rotation of the rollers 33 also increases. Here, in the roller bearing 31 which is a constituent member of the tappet 21, the position of the roller 33 in the roller bearing 31 at the time of high speed rotation can be stabilized by the cage 34. Then, the skew of the roller 33 can be suppressed and the lateral running of the roller bearing 31 can be prevented. Accordingly, it is possible to reduce the risk of poor lubrication of the roller bearing 31 and wear of the roller bearing 31 during high-speed rotation. That is, such a pump tappet can be manufactured at a low cost and can have a long life.

  In addition, the high-pressure pump 11 includes the tappet 21 that can be manufactured at low cost and can reduce the risk of poor lubrication of the roller bearing 31 and wear of the roller bearing 31 during high-speed rotation. The fuel can be manufactured at a low cost, and the pressure of the fuel can be increased more stably in a short time.

  Here, the retainer 34 is an outer diameter guide, and the retainer 34 and the outer ring 32 are provided on the outer diameter surface 34e of the retainer 34 because an oil groove 34f that is recessed inward from the surface is provided. And the radial position of the cage 34 can be stabilized. Further, the oil permeability of the inner diameter surface 34g of the cage 34 and the outer diameter surface 22a of the shaft 22 is improved, and the lubricity between the outer diameter surface 34e of the cage 34 and the inner diameter surface 32b of the outer ring 32 is improved and retained. Wear of the vessel 34 and the outer ring 32 can be suppressed. Therefore, the life of the cage 34, the rollers 33, the outer ring 32, and the shaft 22 can be extended. The oil groove may be provided so as to extend with an inclination in the axial direction, or may be provided so as to extend in a curved manner. A plurality of oil grooves may be provided.

  The cage 34 is an inner diameter guide, and an oil groove may be provided on the inner diameter surface 34 g of the cage 34. By carrying out like this, the holder | retainer 34 and the shaft 22 can be made to contact and the radial position of the holder | retainer 34 can be stabilized. Further, the oil permeability of the outer diameter surface 34e of the cage 34 and the inner diameter surface 32b of the outer ring 32 is improved, and the lubricity between the inner diameter surface 34g of the cage 34 and the outer diameter surface 22a of the shaft 22 is improved and retained. Wear of the vessel 34 and the shaft 22 can be suppressed. Therefore, the life of the cage 34, the rollers 33, the outer ring 32, and the shaft 22 can be extended.

  The cage 34 provided in the roller bearing 31 may be made of resin. By carrying out like this, the holder | retainer 34 itself can be made lightweight and the weight of the tappet 21 can be lightened generally. Therefore, the force required for the reciprocating linear motion, here, the force required for the vertical movement of the tappet 21 can be reduced. Further, when the cage 34 is made of resin, it can be manufactured by injection molding or the like, so that mass production is facilitated and it can be manufactured at low cost. Examples of the material of the cage 34 include nylon 66, nylon 46, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and the like. If necessary, the resin may be filled with carbon fiber, glass fiber, carbon black, or the like.

  In FIG. 12, the dimension of the gap between the rolling surface 33a of the roller 33 accommodated in the pocket 34c and the side wall surface 34h of the column portion 34d is exaggerated and greatly illustrated from the viewpoint of easy understanding. .

  In addition, the roller and shaft which comprise the above-mentioned tappet are manufactured by forging, cutting, etc., steel members, for example, SUJ2 and SCM420 (all are JIS standards).

  Here, in the above-described embodiment, the concave portion into which the positioning pin is fitted is a through-hole penetrating from the inner diameter surface to the outer diameter surface of the case. It does not have to penetrate from the inner diameter surface to the outer diameter surface. Furthermore, you may comprise a recessed part so that it may have a shape dented from the outer diameter surface of the case along the outer diameter surface of a positioning pin. By doing so, the positioning pin and the recess can be more reliably fitted together by aligning the outer diameter surface of the positioning pin and the recess of the case.

  FIG. 14 is a view showing a fitting state of the positioning pins in this case, and corresponds to FIG. Referring to FIG. 14, the recess 27 b has a shape that is recessed from the outer diameter surface 27 a of the case 27 along the outer diameter surface 24 c of the positioning pin 24. Such a recess 27b and the positioning pin 24 can be more reliably fitted together by combining the outer diameter surface 24c of the positioning pin 24 and the recess 27b of the case 27.

  In the above embodiment, the tappet includes one positioning pin and a recess. However, the tappet is not limited to this, and a plurality of positioning pins and recesses may be provided. By so doing, it is possible to more reliably and appropriately regulate the movement of the tappet in the circumferential direction. In this case, a plurality of positioning pins and recesses may be provided so that the circumferential positions of the case are the same and arranged in the longitudinal direction, or may be provided at different positions in the circumferential direction. When a plurality of grooves are provided in the circumferential direction, a plurality of concave grooves are provided on the inner diameter surface of the opening hole of the housing.

  In addition, the positioning pin is provided so that the longitudinal direction of the case and the longitudinal direction of the positioning pin are aligned. However, the present invention is not limited to this, and the longitudinal direction of the case and the longitudinal direction of the positioning pin are perpendicular to each other. It is good also as a structure to provide.

  FIG. 15 is a schematic perspective view showing a part of the tappet in this case, and corresponds to a part of FIG. Referring to FIG. 15, tappet 30 has three cylindrical positioning pins 28a, 28b, and 28c and three concave portions 29a, 29b, and 29c into which they are respectively fitted. The positioning pins 28 a to 28 c are fitted in a direction perpendicular to the longitudinal direction of the case 29. The positioning pins 28 a to 28 c are provided at different positions in the longitudinal direction and at the same position in the circumferential direction of the case 29. With this configuration as well, positioning in the circumferential direction of the case 29 can be restricted and regulated.

  In the above-described embodiment, the cage includes a pair of annular portions and a plurality of column portions, but is not limited thereto, and is divided into a plurality of members instead of an integrated type, A spacer-type cage disposed between the rollers may be used.

  In the above embodiment, the column portion has a shape extending straight in the axial direction. However, the present invention is not limited to this, and the column portion may be bent in the radial direction. It may be shaped like an M-type cage. Furthermore, it is good also as providing the roller stop part which prevents the fall-off | omission of the roller of the radial direction on the side wall surface of a pillar part.

  In the above-described embodiment, the roller bearing is configured to include a cage that holds a plurality of rollers. However, the configuration is not limited thereto, that is, a configuration in which the roller bearing does not include a cage, that is, a full-roller type. The same applies to roller bearings.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The tappet according to the present invention is included in a high-pressure pump that supplies fuel to an engine of an automobile or the like, and is effectively used as an automobile part.

It is sectional drawing which shows a part of high-pressure pump containing the tappet which concerns on one Embodiment of this invention. It is sectional drawing of the tappet contained in the high pressure pump shown in FIG. It is sectional drawing of the tappet contained in the high pressure pump shown in FIG. FIG. 4 is a perspective view of the tappet shown in FIGS. 2 and 3. It is the figure which looked at the tappet shown in FIG. 4 from the direction of arrow V in FIG. It is the figure which looked at the tappet shown in FIG. 4 from the direction of arrow VI in FIG. It is the figure which looked at the tappet shown in FIG. 4 from the direction of arrow VII in FIG. It is the figure which looked at the tappet shown in FIG. 4 from the direction of arrow VIII in FIG. It is a perspective view of a positioning pin. It is a figure which shows the fitting state of a positioning pin, and is equivalent to a part of XX cross section shown in FIG. It is an enlarged view of the part shown by XI of the tappet shown in FIG. It is the figure which looked at a part of roller bearing contained in the tappet shown in FIG. 2 from the direction of arrow XII in FIG. FIG. 12 is a partial cross-sectional view of a roller bearing included in the tappet illustrated in FIG. 2, and is a view cut along a XIII-XIII cross section in FIG. 11. It is a figure which shows the fitting state of the positioning pin contained in the tappet which concerns on other embodiment of this invention, and is a part corresponded in FIG. It is a schematic perspective view which shows a part of tappet which concerns on further another embodiment of this invention, and is equivalent to a part of FIG. It is sectional drawing which shows the tappet as a conventional roller pushrod.

Explanation of symbols

  11 High pressure pump, 12 Cam shaft, 12a Cam, 12b, 22a, 23h, 24c, 27a, 32a, 34e Outer diameter surface, 13 Plunger, 13a, 14a End, 14 Spring, 15 Housing, 16 Open hole, 16a, 23b, 32b, 34g Inner diameter surface, 16b Groove, 17 Spring seat, 21, 30 Tappet, 22 Shaft, 23, 27, 29 Case, 23a Circumferential wall, 23c Intermediate bottom, 23d, 23e Support hole, 23f, 23g Space, 23i Through hole, 24, 28a, 28b, 28c Positioning pin, 24a End face, 24b Chamfer, 25 Oil hole, 27b, 29a, 29b, 29c Recess, 31 Roller bearing, 31a Roller pitch circle, 32 Outer ring, 33 Roller, 33a Rolling Surface, 34 cage, 34a, 34b annular portion, 34c pocket, 34 The pillar portion, 34f oil groove, 34h side wall surface.

Claims (5)

A pump tappet that transmits the rotational motion of a camshaft provided with a cam to a pump plunger as a reciprocating linear motion, and performs a reciprocating linear motion together with the pump plunger,
A shaft, a roller bearing disposed on the outer diameter side of the shaft, and rotatably supported on the shaft; a case that houses the shaft and the roller bearing; and a recess provided on the outer diameter surface; A cylindrical positioning pin that is fitted in the recess so that a part thereof protrudes from the outer diameter surface and positions the case;
The said roller bearing is a tappet for pumps provided with the outer ring | wheel contact | abutted with the said cam, and the some roller arrange | positioned between the said outer ring | wheel and the said shaft. 2. The pump tappet according to claim 1, wherein the recess has a shape recessed from an outer diameter surface of the case so as to follow the outer diameter surface of the positioning pin. The pump tappet according to claim 1 or 2, wherein the positioning pin is press-fitted and fixed in the recess. The pump tappet according to claim 1, wherein a plurality of the recesses and the positioning pins are provided. The said roller bearing is a tappet for pumps in any one of Claims 1-4 provided with the holder | retainer which hold | maintains a roller.

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