JP2021092196A - Pump lifter - Google Patents

Abstract

To provide a pump lifter capable of preventing rotation with a simple structure.SOLUTION: A pump lifter 20 includes a roller 40 which comes into rotatable contact with a cam lobe 60 provided at a cam shaft 61, and a cylindrical member 30 which supports the roller 40 and reciprocates in a prescribed direction in accordance with rotation of the cam lobe 60, and the pump lifter 20 is incorporated into a lifter guide 11. The cylindrical member 30 includes: a pair of support walls 32, 32 confronting with each other to rotatably support the roller 40; and rotation regulating parts 35, 35 respectively protruded from the pair of support walls 32, 32 and arranged to confront an end surface 60A in a rotation axis direction of the cam lobe 60, and regulating the rotation of the cylindrical member 30 with respect to the cam lobe 60.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pump lifter.

Conventionally, in a fuel pump that reciprocates a plunger to pressurize the fuel of an internal combustion engine to a high pressure, a configuration in which a pump lifter is used as an input unit of a driving force to the plunger has been known. For example, Patent Document 1 describes a roller that rotatably contacts a drive cam (cam lob), a pump lifter having a lifter body that rotatably supports the roller, and a guide axis direction orthogonal to the rotation center axis of the drive cam. A roller lifter guide device including a lifter housing that guides the vehicle so that it can reciprocate is disclosed.

In the roller lifter guide device of Patent Document 1, a slit-shaped notch groove that penetrates in the radial direction and extends in the guide axis direction is formed in the lifter housing. Further, the lifter body is formed with a detent projection that projects outward in the radial direction. The lifter body is configured such that the detent projection engages with the notch groove in a concavo-convex manner to prevent the lifter housing from rotating and the cam lob to prevent rotation.

Japanese Unexamined Patent Publication No. 2013-147947

By the way, in the configuration in which the protrusion for preventing rotation is formed on the lifter body as in Patent Document 1, it is necessary to bend the rough material into a protrusion in the process of forming the lifter body. Further, in the configuration in which the slit-shaped notch groove is formed in the lifter housing, it is necessary to adjust the wall thickness so as to be appropriate in consideration of the depth of the notch groove to form the lifter housing. Therefore, there is a demand for a pump lifter that can realize rotation prevention with a simple structure that facilitates processing in the forming process.

The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a pump lifter capable of stopping rotation with a simple configuration.

The pump lifter of the present invention has a roller that rotatably contacts the cam lob provided on the cam shaft, and a tubular member that supports the roller and reciprocates according to the rotation of the cam lob, and serves as a lifter guide. The built-in pump lifter is a tubular member that rotatably supports the rollers with a pair of opposing support walls and a pair of support walls that project from at least one of the pair and end faces in the direction of rotation of the camlob. It is characterized in that it is arranged so as to face each other and includes a rotation regulating unit that regulates the rotation of the tubular member with respect to the cam lob.

The pump lifter of the present invention is provided with a rotation restricting portion that protrudes from at least one of a pair of support walls that support the rollers in the tubular member and is arranged so as to face the end face in the rotation axis direction of the cam lob. Therefore, when the tubular member tries to rotate about an axis along the reciprocating movement direction, the end face of the cam lob is located on the movement locus of the rotation restricting portion, so that the rotation regulating portion interferes with the end face of the cam lob. .. Therefore, it is possible to prevent the tubular member from rotating around the axis along the reciprocating movement direction of the tubular member. By providing a rotation restricting portion that regulates the rotation of the tubular member with respect to the cam lob, it is not necessary to provide a notch groove in the lifter guide, and the pump lifter can be prevented from rotating with a simple configuration.

It is sectional drawing which illustrates a part of the fuel supply apparatus including the pump lifter which concerns on Example 1 of this invention. It is a side sectional view which shows the pump lifter and cam lob of FIG. It is a side sectional view which shows the pump lifter and cam lob which concerns on Example 2. FIG. It is a side sectional view which shows the pump lifter and cam lob which concerns on Example 3. FIG. FIG. 5 is a cross-sectional view of the pump lifter and cam lob according to the fourth embodiment as viewed from above. It is sectional drawing which shows the pump lifter and cam lob which concerns on Example 5. FIG.

Preferred embodiments of the present invention are shown below.
On the outer surface of the tubular member, the outer surface of the support wall and the outer surface of the rotation restricting portion may be continuous without a step in the reciprocating movement direction of the tubular member. This facilitates finishing processing (for example, polishing of the outer surface) of the tubular member, and for example, centerless processing can be performed.

It is preferable that the corner portion of the rotation restricting portion facing the end face of the cam lob is retracted so as to escape from the end face of the cam lob. As a result, the corner portion of the rotation restricting portion that easily comes into contact with the end face of the cam lob is retracted so as to escape from the end face of the cam lob, and the rotation regulating portion regulates the rotation of the tubular member around the axis along a predetermined direction. In some cases, it is possible to make it difficult to contact the end face of the cam lob, and it is possible to improve the durability of the rotation restricting portion.

The rotation restricting portion may be formed thinner than the support wall in a direction orthogonal to the reciprocating movement direction of the tubular member. As a result, the rotation restricting portion can be provided with a reduced weight, and the weight of the pump lifter can be reduced.

The support wall has a first facing surface facing the end face in the rotation axis direction of the roller, and the rotation restricting portion has a second facing surface facing the end face of the cam lob, and the first facing surface. It is preferable that a step is formed between the surface and the second facing surface. As a result, the difference in clearance between the end face of the roller and the first facing surface of the support wall and the clearance between the end face of the cam lob and the second facing surface of the rotation restricting portion can be determined by a step without using a washer or the like. Can be adjusted.

<Example 1>
Example 1 of the present invention will be described with reference to FIGS. 1 and 2. Although the details of the fuel supply device 10 of the first embodiment are not shown, the fuel adjusted to a high pressure by the pump lifter 20 is supplied to the combustion chamber of an engine (not shown). The pump lifter 20 is incorporated in the lifter guide 11 of the cylinder head.

As shown in FIG. 1, the lifter guide 11 is provided with a through hole 12 having a circular cross section that penetrates in the vertical direction. A plunger 13 is inserted into the through hole 12 so as to be slidable in the vertical direction. The upper end portion of the plunger 13 is arranged so as to be able to advance and retreat in the pressure chamber 14 communicating with the upper end of the through hole 12. When the upper end of the plunger 13 enters the pressure chamber 14, the fuel in the pressure chamber 14 is pressurized.

The lifter guide 11 is provided with a guide hole 15 communicating with the lower end of the through hole 12. The guide hole 15 has a circular cross section having a diameter larger than that of the through hole 12, and has a shape that extends in the vertical direction and opens at the lower end of the lifter guide 11. The pump lifter 20 is inserted into the guide hole 15 so as to be reciprocally slidable in the vertical direction (reciprocating direction).

As shown in FIGS. 1 and 2, the pump lifter 20 includes a tubular member 30 and a roller 40. The tubular member 30 supports the roller 40 and reciprocates in the vertical direction according to the rotation of the cam lob 60 as described later. The tubular member 30 includes a peripheral wall 31, a pair of support walls 32, 32, a partition wall 33, a pair of connecting walls 34, 34, and a pair of rotation restricting portions 35, 35. The peripheral wall 31 constitutes the outer shell of the upper portion of the tubular member 30, and has a substantially cylindrical shape substantially along the vertical direction. The outer peripheral surface of the peripheral wall 31 is arranged along the inner peripheral surface of the guide hole 15, and the peripheral wall 31 is slidable in the guide hole 15.

A pair of support walls 32, 32 are provided so as to face each other substantially in parallel at both end portions (left and right end portions in FIG. 2) in the radial direction (direction orthogonal to the vertical direction) of the lower end portion of the peripheral wall 31. Both ends of the shaft member 41 are supported by both support walls 32. As shown in FIG. 1, a cylindrical roller 40 is rotatably supported on the shaft member 41 via a bearing 42 such as a needle bearing.

The roller 40 is arranged so that its outer peripheral surface is in contact with the cam lob 60. The cam lob 60 has a substantially quadrangular shape and is provided on the cam shaft 61. The camshaft 61 is rotatably supported by a pair of support walls (not shown), and its rotation axis is held at a fixed position. The shaft member 41 and the camshaft 61 are arranged along a direction orthogonal to the reciprocating movement direction of the tubular member 30, and are arranged so as to be parallel to each other.

A pair of connecting walls 34, 34 are provided facing each other at both ends (left and right ends in FIG. 1) in the radial direction (direction orthogonal to the vertical direction) of the lower end of the peripheral wall 31. As shown in FIGS. 1 and 2, the pair of connecting walls 34, 34 is formed so as to connect the pair of supporting walls 32, 32, respectively, and is connected to the lower end of the peripheral wall 31 together with the pair of supporting walls 32, 32. It constitutes a shaped wall part. The lower end edges of the pair of connecting walls 34, 34 are connected at the same height as the lower end edges of the pair of support walls 32, 32.

As shown in FIGS. 1 and 2, the partition wall 33 has a flat plate shape along the radial direction in the peripheral wall 31. The outer periphery of the partition wall 33 is integrally connected to the vicinity of the lower end of the inner peripheral surface of the peripheral wall 31. Therefore, the tubular member 30 has a structure that is vertically divided via the partition wall 33. As shown in FIG. 2, the partition wall 33 is formed with a through hole 33A penetrating in the vertical direction in order to supply lubricating oil to the roller 40 from above. A roller 40 arranged between the support walls 32 and 32 is housed below the partition wall 33 of the tubular member 30. The lower end of the roller 40 is visible through the lower part of the connecting wall 34.

The tubular member 30 is extended as much as possible within a range deviating from the rotation locus of the cam lob 60 located below. That is, the vertical sliding length of the peripheral wall 31 is secured to be sufficiently long, and the tubular member 30 has a structure in which it is difficult to tilt in the guide hole 15.

The lower end of the plunger 13, the retainer 51, and the urging member 52 are housed above the partition wall 33 of the tubular member 30. The retainer 51 has a disk shape along the radial direction, and the lower end portion of the plunger 13 is locked and fixed to the central portion thereof. The urging member 52 is a spring material made of a compression coil spring, the lower end of which abuts and supports the upper surface of the retainer 51, and the upper end of the urging member 52 abuts and supports the lifter guide 11, and elastically in the vertical direction. It is said to be stretchable. The urging member 52 has an urging force that urges the tubular member 30 toward the cam lob 60 and presses the roller 40 against the cam lob 60.

As shown in FIGS. 1 and 2, the rotation restricting portion 35 projects downward from the lower end portion of the support wall 32. The rotation regulating unit 35 functions to regulate the rotation of the tubular member 30 with respect to the cam lob 60. The rotation restricting portion 35 extends downward from the central portion (the portion excluding the vicinity of the left and right end portions in FIG. 1) at the lower end portion of the support wall 32. The rotation restricting portion 35 is a substantially square wall portion, and the corners of the lower end portion are rounded. The length of the rotation restricting unit 35 in the vertical direction is about the same as the length of the support wall 32 in the vertical direction. The thickness of the rotation restricting portion 35 (thickness in the left-right direction in FIG. 2) is about the same as the thickness of the peripheral wall 31, the support wall 32, and the partition wall 33. The rotation control portion 35 is integrally formed with the support wall 32.

As shown in FIG. 2, the pair of rotation restricting portions 35, 35 face each other on the plate surfaces. The distance between the pair of rotation restricting portions 35, 35 is the same as the distance between the pair of support walls 32, 32. Further, as shown in FIG. 2, on the outer surface of the tubular member 30 (the surface sliding on the inner peripheral surface of the guide hole 15), the outer surface 32A of the support wall 32 and the outer surface 35A of the rotation restricting portion 35 are tubular. The members 30 are continuous in the reciprocating movement direction (vertical direction). That is, the outer surface 32A of the support wall 32 and the outer surface 35A of the rotation restricting portion 35 are flush with each other without forming a step. In the first embodiment, the inner surface 32B of the support wall 32 (the facing surface facing the end surface 40A in the rotation axis direction (left-right direction in FIG. 2) of the roller 40) and the inner surface 35B of the rotation regulating portion 35 are tubular. The members 30 are continuous in the reciprocating movement direction (vertical direction).

The pair of rotation restricting portions 35, 35 always cam lobs regardless of which reciprocating movement position the pump lifter 20 is located (that is, regardless of which rotation position the cam lob 60 is located). It is arranged so as to face the end faces 60A and 60A in the rotation axis direction of 60, respectively. That is, the pair of rotation restricting portions 35, 35 are provided on the end faces 60A, 60A in the rotation axis direction of the cam lob 60 regardless of whether the pump lifter 20 is located at the top dead center (see FIG. 1) or the bottom dead center. They are facing each other.

Next, the operation of the pump lifter 20 will be described.
When the cam lob 60 rotates via the cam shaft 61, the roller 40 is driven to rotate. At this time, in the fuel suction step, the pump lifter 20 is pressed by the urging force of the urging member 52 and slides downward through the guide hole 15, and the plunger 13 slides downward in the same manner, whereby the upper end of the plunger 13 is formed. The unit retracts from the pressure chamber 14. On the other hand, in the fuel discharge process, the pump lifter 20 slides upward on the guide hole 15 against the urging force of the urging member 52, and the plunger 13 slides upward in the same manner, whereby the upper end portion of the plunger 13 is formed. Enters the pressure chamber 14. In this way, the pump lifter 20 reciprocates in the vertical direction to pressurize the fuel in the pressure chamber 14.

The pump lifter 20 has a configuration in which a pair of rotation restricting portions 35, 35 face each other of the end faces 60A, 60A of the cam lob 60, respectively. Therefore, the end face 60A of the cam lob 60 is located on the movement locus of the rotation restricting portion 35, and even if the pump lifter 20 tries to rotate about the axis along the vertical direction, the rotation regulating portion 35 and the end face 60A of the cam lob 60 It will interfere. As a result, the rotation of the rotation regulating unit 35 is restricted, and the rotation of the pump lifter 20 can be stopped around the axis along the vertical direction. Therefore, the pump lifter 20 can be prevented from rotating in the guide hole 15 of the lifter guide 11.

Conventionally, in order to provide a detent to the pump lifter, for example, a detent protrusion that projects radially outward is formed on the pump lifter, and a groove that extends in the vertical direction and guides the detent protrusion is formed on the lifter guide. Such a configuration is used. In such a configuration, it is necessary to bend the rough material into a protrusion in the process of forming the pump lifter, or if the lifter guide is a separate body (single member), the lifter guide determines the depth of the groove. It will be necessary to adjust the wall thickness to be appropriate in consideration. However, in the pump lifter 20 of the first embodiment, the rotation restricting portion 35 is provided on the tubular member 30, and the pump lifter 20 can be prevented from rotating only by the tubular member 30 and the cam lob 60. Therefore, the pump lifter, the lifter guide, etc. It is possible to have a simple configuration that does not require difficult processing.

Further, since the pump lifter 20 of the first embodiment does not have the detent projections formed as in the conventional case, the chuck position is not limited or the polishing method is not limited when polishing is performed. Further, if the lifter guide is a separate body (single member), it is not necessary to form a groove in the lifter guide, and the lifter guide does not increase the wall thickness in consideration of the depth of the groove. The weight of the lifter guide can be reduced and the mounting space for the lifter guide can be reduced. Further, since it is not necessary to form a groove in the lifter guide, the deburring process is not newly performed because the inner diameter processing of the lifter guide is intermittent processing as in the conventional case. Further, by guiding the detent projection with the groove of the lifter guide, the contact area between the pump lifter and the lifter guide does not become large, and the wear resistance can be improved.

As described above, according to the first embodiment, the pump lifter 20 protrudes from both of the pair of support walls 32 and 32 that support the roller 40 in the tubular member 30, and faces the end surface 60A in the rotation axis direction of the cam lob 60. A rotation control unit 35 is provided so as to do so. When an attempt is made to rotate the tubular member 30 about an axis along a predetermined direction, the end face 60A of the cam lob 60 is located on the movement locus of the rotation restricting portion 35, so that the rotation restricting portion 35 becomes the end face 60A of the cam lob 60. It will interfere. Therefore, by restricting the rotation of the rotation restricting unit 35, it is possible to prevent the tubular member 30 provided with the rotation restricting unit 35 from rotating around the axis along a predetermined direction. By providing the rotation regulating unit 35 that regulates the rotation of the tubular member 30 with respect to the cam lob 60, it is not necessary to provide a notch groove in the lifter guide 11, and the pump lifter 20 is prevented from rotating with respect to the cam lob 60 with a simple configuration. Can be realized.

Further, on the outer surface of the tubular member 30, the outer surface 32A of the support wall 32 and the outer surface 35A of the rotation restricting portion 35 are continuous without a step in the reciprocating movement direction (vertical direction). As a result, a step is not formed on the outer surface of the tubular member 30 by the support wall 32 and the rotation restricting portion 35, so that the finishing process (for example, polishing of the outer surface) of the tubular member 30 can be easily performed, for example, centerless processing. It can be performed.

<Example 2>
FIG. 3 shows Example 2 of the present invention. In the second embodiment, the form of the rotation control unit is different from that of the first embodiment, and the other parts are the same as those of the first embodiment. In the second embodiment, the same structures as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 3, the rotation restricting portion 36 is formed to be thinner than the support wall 32 in the direction orthogonal to the vertical direction (horizontal direction, horizontal direction in FIG. 3). That is, a step 32C is formed on the inner peripheral surface of the tubular member 30 between the support wall 32 and the rotation restricting portion 36. Here, the support wall 32 has a facing surface 32B (corresponding to the first facing surface of the claim) facing the end surface 40A in the rotation axis direction (left-right direction in FIG. 3) of the roller 40. Further, the rotation regulating unit 36 has a facing surface 36A (corresponding to the second facing surface of the claim) facing the end surface 60A of the cam lob 60. A step 32C is formed between the facing surface 32B of the support wall 32 and the facing surface 36A of the cam lob 60.

Such a configuration is effective when the length of the cam lob 60 in the rotation axis direction (left-right direction in FIG. 3) is larger than the length of the roller 40 in the rotation axis direction (left-right direction in FIG. 3). That is, without using a washer or the like, the clearance between the end surface 40A of the roller 40 and the facing surface 32B of the support wall 32, the clearance between the end surface 60A of the cam lob 60 and the facing surface 36A of the rotation restricting portion 36, and so on. Can be adjusted to the same extent.

As described above, according to the second embodiment, in the pump lifter 20, the rotation restricting portion 35 is formed to be thinner than the support wall 32 in the direction (horizontal direction) orthogonal to the reciprocating movement direction (vertical direction). There is. As a result, the rotation restricting portion 35 can be provided with a reduced weight, and the weight of the pump lifter 20 can be reduced.

Further, the support wall 32 has an facing surface 32B facing the end surface 40A in the rotation axis direction of the roller 40. The rotation control unit 36 has an facing surface 36A facing the end surface 60A of the cam lob 60. A step 32C is formed between the facing surface 32B and the facing surface 36A. As a result, the difference in clearance between the end surface 40A of the roller 40 and the facing surface 32B of the support wall 32 and the clearance between the end surface 60A of the cam lob 60 and the facing surface 36A of the rotation restricting portion 36 can be determined by using a washer or the like. It can be adjusted by the step 32C.

<Example 3>
FIG. 4 shows Example 3 of the present invention. The third embodiment is different from the first embodiment in that the washer 70 is mainly attached to the shaft member 41, and is the same as the first embodiment. In the third embodiment, the same structures as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 4, the pump lifter 20 has a configuration in which a washer 70 is assembled to a shaft member 41 between a support wall 32 and a roller 40. Specifically, a washer 70 having the same thickness is provided between each of the pair of support walls 32 and 32 and the roller 40. Further, similarly to the first embodiment, the inner surface 32B of the support wall 32 (the facing surface facing the end surface 40A in the rotation axis direction (left-right direction in FIG. 4) of the roller 40) and the inner surface 35B of the rotation regulating portion 35 are The tubular member 30 is continuous in the reciprocating movement direction (vertical direction). As a result, even if the length of the cam lob 60 in the rotation axis direction (left-right direction in FIG. 4) is larger than the length of the roller 40 in the rotation axis direction (left-right direction in FIG. 4), the end face 40A of the roller 40 The difference between the clearance between the support wall 32 and the facing surface 32B of the support wall 32 and the clearance between the end surface 60A of the cam lob 60 and the facing surface 36A of the rotation restricting portion 36 can be absorbed by the washer 70.

<Example 4>
FIG. 5 shows Example 4 of the present invention. In the fourth embodiment, the form of the rotation control unit is different from that of the first embodiment, and the other parts are the same as those of the first embodiment. In the fourth embodiment, the same structures as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 5, the pump lifter 20 includes a rotation regulating unit 37. The rotation restricting portion 37 includes a flat plate portion 37A and a pair of corner portions 37B and 37B. The flat plate portion 37A constitutes an inner portion of the rotation restricting portion 37 in the horizontal direction (vertical direction in FIG. 5), and is a flat plate-shaped portion facing the end surface 60A of the cam lob 60. The corner portion 37B constitutes an edge portion in the horizontal direction (vertical direction in FIG. 5) of the rotation restricting portion 37, and is bent and connected in a curved shape with respect to the flat plate portion 37A. The corner portion 37B is retracted so as to escape from the end face 60A of the cam lob 60. Specifically, the corner portion 37B is formed so as to be curved outward (the side away from the cam lob 60) as the distance from the other corner portion 37B in the rotation restricting portion 37 increases.

When the tubular member 30 intends to rotate about an axis along the vertical direction, the rotation regulating unit 37 tries to rotate about the same axis as the rotation axis of the tubular member 30. However, since the corner portion 37B is retracted so as to escape from the end face 60A of the cam lob 60, even if the tubular member 30 tries to rotate, the tubular member 30 does not come into contact with the end face 60A of the cam lob 60. On the other hand, when the flat plate portion 37A comes into contact with the end face 60A of the cam lob 60, the pump lifter 20 can be prevented from rotating with respect to the cam lob 60.

As described above, the corner portion 37B of the rotation restricting portion 37 facing the end face 62 of the cam lob 60 is retracted so as to escape from the end face 60A of the cam lob 60. Therefore, the edge portion of the rotation restricting portion 37 that easily comes into contact with the end face 62 of the cam lob 60 can be retracted so as to escape from the end face 62 of the cam lob 60 as a configuration of the corner portion 37B. As a result, when the rotation restricting portion 37 restricts the rotation of the tubular member 30 around the axis along a predetermined direction, it is possible to make it difficult to contact the end face 62 of the cam lob 60, and the durability of the rotation regulating portion 35 is improved. Can be improved.

<Example 5>
FIG. 6 shows Example 5 of the present invention. In the fifth embodiment, the form of the rotation control unit is different from that of the first embodiment, and the other parts are the same as those of the first embodiment. In the fifth embodiment, the same structures as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 6, the pump lifter 20 includes a rotation restricting portion 38. The rotation regulating portion 38 includes a flat plate portion 38A and a pair of extending portions 38B and 38B. The flat plate portion 38A extends downward from the lower end portion of the support wall 32, as in the first embodiment. The pair of extending portions 38B and 38B extend downward from both corners at the lower end of the flat plate portion 38A in a longitudinal shape. The lower end portion of the flat plate portion 38A and the pair of extending portions 38B, 38B face the end surface 60A of the cam lob 60. The pair of extending portions 38B, 38B are positioned so as to sandwich the camshaft 61 from the horizontal direction (horizontal direction in FIG. 6). In such a configuration, it is possible to sufficiently secure a portion of the rotation regulating portion 38 facing the end surface 60A of the cam lob 60 while avoiding the rotation regulating portion 38 from interfering with the cam shaft 61.

<Other Examples>
The present invention is not limited to the examples described in the above description and drawings, and for example, the following aspects are also included in the technical scope of the present invention.
(1) In the first embodiment, the rotation restricting portion 35 is formed on both of the pair of support walls 32 and 32, but the rotation restricting portion 35 is formed on one of the pair of support walls 32 and 32. You may.
(2) In the first embodiment, the cam lob 60 has a substantially quadrangular shape, but it may have a triangular shape or another shape.
(3) In the second embodiment, the pump lifter 20 has a stepped shape formed on the inner peripheral surface of the tubular member 30 by the support wall 32 and the rotation restricting portion 36, but on the outer peripheral surface of the tubular member 30. A stepped shape may be formed.

20 ... Pump lifter 30 ... Cylindrical member 32 ... Support wall 32A ... Outer surface 32B ... Facing surface (first facing surface)
35, 36, 37, 38 ... Rotation control unit 35A ... Outer surface 36A ... Facing surface (second facing surface)
40 ... Roller 40A ... End face 60 ... Camrob 60A ... End face 62B ... Corner

Claims (5)

A pump lifter that has a roller that rotatably contacts a cam lob provided on a cam shaft and a tubular member that reciprocates in response to the rotation of the cam lob, and is incorporated in a lifter guide.
The tubular member
A pair of opposing support walls that rotatably support the rollers,
A rotation restricting portion that protrudes from at least one of the pair of support walls, is arranged so as to face the end face in the rotation axis direction of the cam lob, and regulates the rotation of the tubular member with respect to the cam lob.
A pump lifter characterized by being equipped with. The pump lifter according to claim 1, wherein on the outer surface of the tubular member, the outer surface of the support wall and the outer surface of the rotation restricting portion are continuous without a step in the reciprocating movement direction of the tubular member. .. The pump lifter according to claim 1 or 2, wherein the corner portion of the rotation restricting portion facing the end face of the cam lob is retracted so as to escape from the end face of the cam lob. The aspect according to any one of claims 1 to 3, wherein the rotation restricting portion is formed to be thinner than the support wall in a direction orthogonal to the reciprocating movement direction of the tubular member. Pump lifter. The support wall has a first facing surface facing the end face in the rotation axis direction of the roller.
The rotation restricting portion has a second facing surface facing the end surface of the cam lob.
The pump lifter according to any one of claims 1 to 4, wherein a step is formed between the first facing surface and the second facing surface.

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