JP2018062900A - Roller lifter for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller lifter for an internal combustion engine which can inhibit wear of a lifter body and slap sound.SOLUTION: A roller lifter 1 includes: a cylindrical lifter body 2 including a slide surface 210 which slides relative to an inner wall of a cylinder at the outer periphery side; and a roller 3 which is attached through a pivot support pin 4 so as to rotate relative to the lifter body 2 and contacts with a rotating cam. The lifter body 2 has: an outer peripheral wall part 21 including the slide surface 210; and a partition wall part 22 which partitions an inner space of the outer peripheral wall part 21 in a slide direction Z. The partition wall part 22 partitions the inner space of the outer peripheral wall part 21 into a lower space 201 which is located at the side where the roller 3 is disposed in the slide direction Z and an upper space 202 opposite to the lower space 201. A communication hole 23 which penetrates through the outer peripheral wall part 21 so as to connect the upper space 202 with the outer periphery side is formed at the outer peripheral wall part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a roller lifter for an internal combustion engine used for an automobile engine or the like.

  For example, as a pump lifter or the like used for a fuel supply pump in an internal combustion engine such as an automobile engine, a roller lifter in which a portion in contact with a rotating cam is configured by a roller is used as disclosed in Patent Document 1. The roller lifter has a lifter body having a sliding surface on the outer peripheral side, and a roller rotatably attached to the lifter body. Such a roller lifter can reduce the frictional resistance with the cam, and can improve the wear resistance of the contact surface with the cam.

JP 2012-138596 A

However, the roller lifter has the following problems.
That is, when the roller lifter reciprocates in the cylinder, a phenomenon may occur in which the lifter body is slightly inclined and hits the inner wall surface of the cylinder. As a result, the lifter body is partially worn and a slap sound is generated. That is, every time the nose portion of the cam passes the surface of the roller, the tilt direction of the lifter body changes. Therefore, as the cam rotates, the abutment between the lifter body and the inner wall surface of the cylinder is repeated, causing the above-described wear and slap noise.

  In order to reduce such wear and slap noise of the lifter body, it is conceivable to increase the amount of lubricating oil supplied between the lifter body and the inner wall surface of the cylinder. However, due to the design of the internal combustion engine, it may be difficult to simply increase the amount of lubricating oil supplied between the lifter body and the inner wall surface of the cylinder. On the other hand, the lubricating oil is often sufficiently supplied to the rollers.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a roller lifter for an internal combustion engine that can suppress wear and slap noise of a lifter body.

One aspect of the present invention is a cylindrical lifter body provided on the outer peripheral side with a sliding surface that slides against the inner wall of the cylinder,
A roller that is rotatably attached to the lifter body via a pivot pin, and has a roller that contacts the rotating cam;
The lifter body has an outer peripheral wall portion provided with the sliding surface, and a partition wall portion that partitions a space inside the outer peripheral wall portion in a sliding direction.
The partition wall section divides the internal space of the outer peripheral wall section into a lower lower space which is the side where the roller is disposed in the sliding direction and an upper upper space which is the opposite side. ,
In the outer peripheral wall portion, there is a roller lifter for an internal combustion engine in which a communication hole penetrating the upper space and the outer peripheral side is formed.

  In the roller lifter, a communication hole penetrating the upper space and the outer peripheral side is formed in the outer peripheral wall portion. Therefore, the lubricating oil that has reached the upper space can be guided to the outer peripheral side of the lifter body. That is, in the roller lifter, the lubricating oil is often sufficiently supplied to the roller, and the lubricating oil is scattered around. Part of the scattered lubricating oil moves to the upper space of the lifter body, and sometimes accumulates in the upper space. Lubricating oil in the upper space can be supplied to the outer peripheral side of the lifter body through the communication hole.

  Then, the supply amount of the lubricating oil between the sliding surface of the lifter body and the inner wall of the cylinder can be increased. That is, the lubricating oil can be collected between the sliding surface of the lifter body and the inner wall of the cylinder without performing a design such as supplying the lubricating oil directly to the portion. As a result, the collision between the lifter body and the inner wall of the cylinder can be mitigated, and wear and slap noise of the lifter body can be reduced.

  As described above, according to the above aspect, it is possible to provide a roller lifter for an internal combustion engine that can suppress wear and slap noise of the lifter body.

FIG. 3 is a side view of the roller lifter according to the first embodiment. FIG. 3 is a longitudinal sectional view of a roller lifter according to the first embodiment. III view of FIG. IV view of FIG. The VV arrow directional cross-sectional view of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1. Sectional explanatory drawing which shows the sliding mechanism at the time of using the roller lifter in Embodiment 1 as a pump lifter. FIG. 3 is an explanatory diagram showing the flow of lubricating oil in the first embodiment. FIG. 3 is an explanatory view showing the inclination of the lifter body in the first embodiment. FIG. 5 is another explanatory diagram showing the inclination of the lifter body in the first embodiment. FIG. 6 is a longitudinal sectional view of a roller lifter according to a second embodiment. FIG. 5 is a longitudinal sectional view of a roller lifter according to a third embodiment. The side view of the roller lifter in Embodiment 3.

  The roller lifter for an internal combustion engine can be used as a pump lifter used for a fuel supply pump in an internal combustion engine such as an automobile engine.

  It is preferable that the communication hole is formed at a position in the front-rear direction perpendicular to both the axial support direction and the sliding direction, which is the direction in which the axial support pins are arranged, with respect to the center axis of the lifter body. In this case, wear and slap noise of the lifter body can be more effectively suppressed. That is, the lifter body tends to incline about an axis parallel to the shaft support pin as it reciprocates in the cylinder. Therefore, the contact between the lifter body and the inner wall of the cylinder occurs in the front-rear direction. Therefore, since the communication hole is formed at a position in the front-rear direction with respect to the central axis of the lifter body, the lubricating oil can be efficiently supplied to the position. As a result, wear and slap noise of the lifter body can be suppressed more effectively.

  The communication holes are more preferably formed at both positions in the front-rear direction with respect to the central axis of the lifter body. In this case, as described above, the lubricating oil can be efficiently supplied to both positions in the front-rear direction in which contact between the lifter body and the inner wall of the cylinder is likely to occur. As a result, wear and slap noise of the lifter body can be suppressed more effectively.

  In the communication hole, it is preferable that at least a part of the opening on the upper space side is arranged at the same position in the sliding direction as the upper surface of the partition wall. In this case, the lubricating oil in the upper space can be smoothly guided to the outer peripheral side of the lifter body through the communicating portion.

  Moreover, it is preferable that the said lifter main body has a rotation prevention part projected over the radial direction outer side from the said sliding surface, and the said communicating hole is arrange | positioned adjacently around this rotation prevention part. In this case, the communication hole can be formed along with the processing of the rotation stopper. Therefore, it is possible to improve the production efficiency of the roller lifter.

  Moreover, the said rotation prevention part is formed so that it may protrude outside as it goes to the lower side in the said sliding direction, It is preferable that the said communicating hole is formed in the lower side of the said rotation prevention part. . In this case, the lubricating oil can be smoothly guided from the communication hole to the outer peripheral side of the lifter body.

  In addition, two communication holes are formed, one of the communication holes is disposed adjacent to the periphery of the rotation preventing portion, and the other communication hole rotates around the central axis of the lifter body. It is preferable that it is formed on the opposite side of the stopper. In this case, since one of the communication holes can be formed along with the processing of the rotation stopper, it is easy to improve production efficiency. Furthermore, it can be opened toward two places on the opposite sides of the sliding surface of the lifter body. Therefore, the lubricating oil can be sufficiently guided to the sliding surface.

  Moreover, it is preferable that the position of the upper surface of the said partition wall part is an upper side of the said sliding direction rather than the gravity center of the said whole roller lifter. In this case, the lubricating oil guided from the communication hole to the sliding surface can be efficiently guided to the contact portion between the lifter body and the inner wall of the cylinder. That is, when the position of the upper surface of the partition wall portion is above the center of gravity of the roller lifter, the lower end of the lifter body swings relatively large. If it does so, the lower end of a lifter main body will contact | abut to the inner wall of a cylinder especially strongly. On the other hand, since the lubricating oil guided from the communication hole to the sliding surface drips toward the lower end of the sliding surface, it is easily guided to the lower end of the sliding surface. As a result, since the lubricating oil can be efficiently guided to the contact portion between the lower end of the lifter body and the inner wall of the cylinder, it is possible to more effectively suppress wear and slap noise of the lifter body.

  In addition, it is preferable that no through hole is formed in the partition wall. That is, it is preferable that the lubricating oil in the upper space is not directly guided to the lower space. Thereby, the lubricating oil in the upper space can be efficiently guided to the sliding surface through the communication hole.

(Embodiment 1)
An embodiment of a roller lifter for an internal combustion engine will be described with reference to FIGS.
The roller lifter 1 of the present embodiment includes a cylindrical lifter body 2 and a roller 3 that is rotatably attached to the lifter body 2 via a shaft support pin 4. As shown in FIGS. 1 to 6, the lifter body 2 includes a sliding surface 210 that slides against the inner wall 51 of the cylinder 5 on the outer peripheral side as shown in FIG. 7. The roller 3 contacts the rotating cam 6.

As shown in FIG. 2, the lifter body 2 includes an outer peripheral wall portion 21 having a sliding surface 210 and a partition wall portion 22 that partitions a space inside the outer peripheral wall portion 21 in a sliding direction Z.
The partition wall portion 22 partitions the internal space of the outer peripheral wall portion 21 into a lower space 201 on the lower side that is the side where the roller 3 is disposed in the sliding direction Z and an upper space 202 on the upper side that is on the opposite side. ing.

  As shown in FIGS. 2 to 4 and 6, the outer peripheral wall portion 21 is formed with a communication hole 23 penetrating so as to connect the upper space 202 and the outer peripheral side.

  As shown in FIGS. 2 and 5, the roller 3 is disposed in the lower space 201 in the lifter body 2. However, a part of the roller 3 protrudes below the lower end of the outer peripheral wall portion 21. As shown in FIG. 5, the lifter body 2 has a pair of support portions 24 that support the pivot pins 4. In addition, the pivot pin 4 is fixed by caulking and fixing both end portions 40 into support holes 241 provided in the pair of support portions 24. As shown in FIG. 2, the roller 3 is rotatably attached to the shaft support pin 4 via a bearing 41. In FIG. 5, the bearing is omitted.

  As shown in FIG. 6, the communication hole 23 is formed so that the position of the lifter body 2 with respect to the central axis C is perpendicular to both the shaft support direction X and the sliding direction Z, which are the directions in which the shaft support pins 4 are arranged. Y position. In the present embodiment, two communication holes 23 are formed. The communication holes 23 are formed at both positions in the front-rear direction Y with respect to the central axis C of the lifter body 2. That is, when viewed from the sliding direction Z, the two communication holes 23 are arranged so that a straight line orthogonal to the central axis C passes through the two communication holes 23.

  As shown in FIGS. 1 to 3 and FIG. 6, the lifter body 2 has a detent portion 25 that protrudes radially outward from the sliding surface 210. A communication hole 23 is disposed adjacent to the periphery of the rotation stopper 25. The anti-rotation part 25 is formed so as to project outward as it goes from the upper side to the lower side in the sliding direction Z. A communication hole 23 is formed below the anti-rotation portion 25.

  The anti-rotation portion 25 is formed by forging so as to punch out a part of the outer peripheral wall portion 21 of the cylindrical lifter body 2. That is, in the shape seen from the front-rear direction Y, the anti-rotation part 25 protrudes to the outer peripheral side so as to separate the outline other than the upper side of the rectangular shape from the periphery as shown in FIG. Along with this, an opening that penetrates the outer peripheral wall 21 is formed below the rotation stopper 25 in the lifter body 2. This opening becomes one of the communication holes 23.

  In the present embodiment, as shown in FIGS. 2 and 4, two communication holes 23 are formed. One communication hole 231 is arranged adjacent to the periphery of the rotation stopper 25. The other communication hole 232 is formed on the opposite side of the rotation stopper 25 with the central axis C of the lifter body 2 interposed therebetween. The communication hole 232 can be formed, for example, by processing the outer peripheral wall portion 21 using a drill or the like, and can be formed into a circular shape, for example. However, the shape of the communication hole 232 is not particularly limited.

As shown in FIG. 2, in the communication hole 23, at least a part of the opening on the upper space 202 side is arranged at the same position in the sliding direction Z with the upper surface of the partition wall portion 22. In the present embodiment, the two communication holes 23 are both disposed at the same position in the sliding direction Z as the upper surface of the partition wall portion 22.
The communication hole 23 has a lower end surface formed in parallel to the front-rear direction Y. The lower end surface of the communication hole 23 is formed at the same position in the sliding direction Z as the upper surface of the partition wall portion 22.

  The partition wall 22 has an upper surface located above the center of gravity of the entire roller lifter 1 in the sliding direction Z. Further, no through hole is formed in the partition wall portion 22.

As shown in FIGS. 1 to 4, the sliding surface 210 includes an upper sliding surface 212 formed above the anti-rotation portion 25, and a lower sliding surface 211 formed below the anti-rotation portion 25. It is divided into
A constricted portion 213 constricted radially inward of the sliding surface 210 is formed between the upper sliding surface 212 and the lower sliding surface 211.

Moreover, as shown in FIGS. 1 to 3, the detent portion 25 protrudes from the constricted portion 213. The anti-rotation part 25 is formed so that a part of the lifter body 2 is punched out in a part of the contour of the anti-rotation part 25 so as to project outward in the radial direction.
Further, the lower end portion of the rotation stopper 25 protrudes radially outward from the sliding surface 210. As a result, the lower end surface 250 of the rotation stopper 25 and a part of the pair of side end surfaces 251 are exposed from the constricted portion 213.
The lifter body 2 has a substantially cylindrical shape, and the sliding surface 210 has a cross-sectional shape orthogonal to the sliding direction Z, and is constituted by a perfect circle or a part of a true circle.

  Of the sliding surfaces 210, the lower sliding surface 211 is formed from the vicinity of the lower end portion of the lifter body 2 to the vicinity of the center portion, and the upper sliding surface 212 is formed near the front end portion of the lifter body 2. ing. The upper sliding surface 212 is formed over the entire outer peripheral surface of the lifter body 2. On the other hand, the lower sliding surface 211 is formed on a part of the outer peripheral surface of the lifter body 2 in the circumferential direction.

  A constricted portion 213 is formed between the upper sliding surface 212 and the lower sliding surface 211. The constricted portion 213 is shorter in the sliding direction Z than the upper sliding surface 212 and longer than the lower sliding surface 211. Further, the constricted portion 213 is recessed, for example, about 100 μm or more inward with respect to the sliding surface 210.

Further, a chamfered portion 214 is formed at each of the upper end portion and the lower end portion of the lifter body 2.
The pair of support portions 24 is formed from the lower end portion of the lifter body 2 to the lower side of the lower end portion of the constricted portion 213. The pair of support portions 24 are formed by forming their outer surfaces as flat surfaces parallel to each other. The outer surface of the support portion 24 is a surface perpendicular to the axial support direction X. Further, the outer surface of the support portion 24 is disposed at a position closer to the central axis C than the sliding surface 210.

The roller lifter 1 of this example can be used as a pump lifter used for a fuel supply pump 7 in an internal combustion engine such as an automobile engine as shown in FIG.
In the roller lifter 1 in this example, as shown in FIG. 7, for example, the lifter body 2 having the sliding surface 210 slides against the inner wall 51 of the cylinder 5 in the fuel supply pump 7, and the roller 3. Is attached so as to contact the rotating cam 6.

The fuel supply pump 7 pressurizes the fuel F supplied from a fuel tank (not shown) in synchronism with the rotation of the fuel cam 6 provided on the camshaft 61 of the reciprocating engine. Is supplied to an injector (not shown).
In the fuel supply pump 7, the pump lifter (roller lifter 1) is configured to slide in the cylinder 5 provided in the cylinder head 73 of the reciprocating engine while the roller 3 is driven to rotate in response to the rotation of the cam 6.

The pump lifter (roller lifter 1) is configured to contact the lower end 751 of the plunger 75 slidably disposed on the cylinder head 73 and slide the plunger 75. Thereby, the fuel F in the pressurizing chamber 76 formed in the cylinder head 73 is pressurized by the upper end portion 752 of the plunger 75. The pressurizing chamber 76 is formed in the middle of a fuel supply passage 79 formed in the cylinder head 73 so as to communicate the fuel tank 71 and the injector 72.
The pump lifter (roller lifter 1) is arranged so that the upper surface of the partition wall portion 22 of the lifter body 2 is in contact with the lower end portion 751 of the plunger 75.

A retainer 77 is fixed to the outer periphery of the plunger 75 and is configured to abut against the partition wall portion 22. Further, a spring 78 for biasing the pump lifter (roller lifter 1) in the direction of the cam 6 is disposed between the retainer 77 and the cylinder head 73.
As shown in the figure, the detent portion 25 of the lifter body 2 slides along the sliding direction Z in a detent groove 53 formed along the axial direction of the cylinder 5 provided in the cylinder head 73. Engage possible.

  In the present embodiment, the roller lifter 1 is disposed so that the axial direction is substantially vertical. The upper side of the roller lifter 1 is the upper side in the vertical direction, and the lower side of the roller lifter 1 is the lower side in the vertical direction.

Next, the effect of this embodiment is demonstrated.
In the roller lifter 1, a communication hole 23 is formed in the outer peripheral wall portion 21 so as to penetrate the upper space 202 and the outer peripheral side. Therefore, the lubricating oil that has reached the upper space 202 can be guided to the outer peripheral side of the lifter body 2. That is, in the roller lifter 1, the lubricating oil is often sufficiently supplied to the roller 3, and the lubricating oil is scattered around. A part of the scattered lubricating oil moves to the upper space 202 of the lifter main body 2 and sometimes accumulates in the upper space 202. Lubricating oil G in the upper space 202 can be supplied to the outer peripheral side of the lifter body 2 through the communication hole 23 as shown in FIG.

  Then, the supply amount of the lubricating oil between the sliding surface 210 of the lifter body 2 and the inner wall 51 of the cylinder 5 can be increased. That is, the lubricating oil can be collected between the sliding surface 210 of the lifter body 2 and the inner wall 51 of the cylinder 5 without performing a design such as supplying the lubricating oil directly to the portion. As a result, the collision between the lifter body 2 and the inner wall 51 of the cylinder 5 can be mitigated, and wear and slap noise of the lifter body 2 can be reduced.

  Further, no through hole is formed in the partition wall portion 22. That is, the lubricating oil G in the upper space 202 is not directly guided to the lower space 201. Thereby, the lubricating oil G in the upper space 202 can be efficiently guided to the sliding surface 210 through the communication hole 23.

  In addition, the communication hole 23 is formed in a position in the front-rear direction Y with respect to the center axis C of the lifter body 2. Therefore, wear and slap noise of the lifter body 2 can be more effectively suppressed. That is, as shown in FIGS. 9 and 10, the lifter body 2 tends to incline about an axis parallel to the shaft support pin as the cylinder 5 reciprocates. 9 and 10 are drawn with the inclination of the lifter main body 2 larger than the actual inclination for convenience.

  More specifically, depending on the phase of the cam 6, the lifter body 2 passes through the contact portion between the partition wall portion 22 and the lower end portion 751 of the plunger 75 and is centered on an axis Lx parallel to the axial support direction X. Try to tilt. That is, every time the nose portion 62 of the cam 6 passes through the surface of the roller 3, the tilt direction of the lifter body 2 changes. The contact between the lifter body 2 and the inner wall 51 of the cylinder 5 occurs in the front-rear direction Y. Therefore, the communication hole 23 is formed at a position in the front-rear direction Y with respect to the central axis C of the lifter body 2, so that the lubricating oil G can be efficiently supplied to the position as shown in FIG. it can. As a result, wear and slap noise of the lifter body 2 can be suppressed more effectively.

  As shown in FIGS. 2 and 6, the communication holes 23 are formed at both positions in the front-rear direction Y with respect to the central axis C of the lifter body 2. Thereby, as described above, the lubricating oil can be efficiently supplied to both positions in the front-rear direction Y in which the contact between the lifter body 2 and the inner wall 51 of the cylinder 5 is likely to occur. As a result, wear and slap noise of the lifter body 2 can be suppressed more effectively.

  Further, in the communication hole 23, at least a part of the opening on the upper space 202 side is disposed at the same position in the sliding direction Z as the upper surface of the partition wall portion 22. Thereby, the lubricating oil in the upper space 202 can be smoothly guided to the outer peripheral side of the lifter body 2 through the communication portion 23.

  One communication hole 231 is disposed adjacent to the periphery of the rotation stopper 25. Thereby, the communication hole 231 can be formed with the processing of the rotation stopper 25. Therefore, the production efficiency of the roller lifter 2 can be improved.

  Further, the anti-rotation portion 25 is formed so as to project outward as it goes from the upper side to the lower side in the sliding direction Z, and a communication hole 231 is formed below the anti-rotation portion 25. Thereby, lubricating oil can be smoothly guide | induced to the outer peripheral side of the lifter main body 2 from the communicating hole 23. FIG.

Further, one communication hole 231 is disposed adjacent to the periphery of the rotation stopper 25, and the other communication hole 232 is formed on the opposite side of the rotation stopper 25 with the central axis C of the lifter body 2 interposed therebetween. Therefore, the communication holes 23 can be opened toward the two opposite sides of the sliding surface 210 of the lifter body 2. Therefore, the lubricating oil can be sufficiently guided to the sliding surface 210.
Further, when forming the anti-rotation part 25, a pressing jig is inserted from the previously formed communication hole 232, and a part of the outer peripheral wall part 21 is projected outward in the radial direction to form the anti-rotation part 25. It is also possible to perform such processing. Thereby, the production efficiency of the roller lifter 1 can be improved.

  Further, the upper surface of the partition wall 22 is located above the sliding direction Z from the center of gravity of the entire roller lifter 2. Thereby, the lubricating oil guided to the sliding surface 210 from the communication hole 23 can be efficiently guided to the contact portion between the lifter body 2 and the inner wall 51 of the cylinder 5. That is, when the position of the upper surface of the partition wall portion 22 is above the center of gravity of the roller lifter 2, the lower end of the lifter body 2 swings relatively large. As a result, the lower end of the lifter body 2 is particularly strongly brought into contact with the inner wall 51 of the cylinder 5. On the other hand, since the lubricating oil guided from the communication hole 23 to the sliding surface 210 hangs down toward the lower end of the sliding surface 210, it is easily guided to the lower end of the sliding surface 210. As a result, since the lubricating oil can be efficiently guided to the contact portion between the lower end of the lifter body 2 and the inner wall 51 of the cylinder 5, it is possible to more effectively suppress wear and slap noise of the lifter body 2. it can.

  As described above, according to this embodiment, it is possible to provide a roller lifter for an internal combustion engine that can suppress wear and slap noise of the lifter body.

(Embodiment 2)
In the present embodiment, as shown in FIG. 11, the communication hole 232 formed on the opposite side of the anti-rotation portion 25 in the front-rear direction Y is inclined in the sliding direction Z with respect to the front-rear direction Y.
That is, the communication hole 232 is inclined so as to go downward in the sliding direction Z from the inside toward the outside.
Other configurations are the same as those of the first embodiment. Of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the above-described embodiments represent the same components as those in the above-described embodiments unless otherwise indicated.

In the present embodiment, the lubricating oil in the upper space 202 can be more smoothly guided to the sliding surface 210 through the communication hole 232.
In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
This embodiment is an embodiment of the roller lifter 1 in which the rotation preventing portion 25 is provided at the lower end portion of the lifter body 2 as shown in FIGS.
In the present embodiment, the anti-rotation portion 25 extends downward from the lower end of the lifter body 2 and is bent outward in the front-rear direction Y.

Accordingly, the two communication holes 23 are provided at positions different from the positions adjacent to the rotation stopper 25. In the present embodiment, the two communication holes 23 are formed in the same shape. That is, for example, the two communication holes 23 are formed as circular through holes in the shape viewed from the front-rear direction Y as shown in FIG. However, this shape is not particularly limited. Further, the two communication holes 23 do not necessarily have the same shape.
Further, in the present embodiment, as shown in FIG. 13, the pair of shaft support portions 24 protrudes downward from the lower end of the lifter body 2.
Other configurations are the same as those of the first embodiment.

In the present embodiment, it is possible to shorten the formation region of the anti-rotation groove 53 (see FIG. 7) for engaging the anti-rotation portion 25 when the roller lifter 1 is disposed in the cylinder.
In addition, the same effects as those of the first embodiment are obtained.

  The present invention is not limited to the above embodiments, and can be applied to various embodiments without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Roller lifter 2 Lifter main body 201 Lower space 202 Upper space 21 Outer peripheral wall part 210 Sliding surface 22 Partition wall part 23,231,232 Communication hole 3 Roller 4 Axle support pin

Claims (8)

A cylindrical lifter body having a sliding surface that slides against the inner wall of the cylinder on the outer peripheral side;
A roller that is rotatably attached to the lifter body via a pivot pin, and has a roller that contacts the rotating cam;
The lifter body has an outer peripheral wall portion provided with the sliding surface, and a partition wall portion that partitions a space inside the outer peripheral wall portion in a sliding direction.
The partition wall section divides the internal space of the outer peripheral wall section into a lower lower space which is the side where the roller is disposed in the sliding direction and an upper upper space which is the opposite side. ,
A roller lifter for an internal combustion engine, wherein a communication hole is formed in the outer peripheral wall portion so as to connect the upper space and the outer peripheral side.   The said communication hole is a position of the front-back direction orthogonal to both the axial support direction which is the arrangement | positioning direction of the said axial support pin, and the said sliding direction with respect to the center axis | shaft of the said lifter main body. 2. A roller lifter for an internal combustion engine according to 1.   The roller lifter for an internal combustion engine according to claim 2, wherein the communication hole is formed at both positions in the front-rear direction with respect to a central axis of the lifter body.   The communication hole according to any one of claims 1 to 3, wherein at least a part of the opening portion on the upper space side is disposed at the same position in the sliding direction as the upper surface of the partition wall portion. A roller lifter for an internal combustion engine as described.   5. The lifter body according to claim 1, wherein the lifter body has a rotation preventing portion that protrudes radially outward from the sliding surface, and the communication hole is disposed adjacent to the periphery of the rotation preventing portion. 2. A roller lifter for an internal combustion engine according to 1.   The anti-rotation portion is formed so as to protrude outward from the upper side to the lower side in the sliding direction, and the communication hole is formed below the anti-rotation portion. A roller lifter for an internal combustion engine as described.   The two communication holes are formed, one of the communication holes is disposed adjacent to the periphery of the rotation preventing portion, and the other communication hole is the rotation prevention portion sandwiching the central axis of the lifter body. The roller lifter for an internal combustion engine according to claim 5 or 6, wherein the roller lifter is formed on the opposite side of the internal combustion engine.   The roller lifter for an internal combustion engine according to any one of claims 1 to 7, wherein a position of an upper surface of the partition wall portion is above the center of gravity of the entire roller lifter in the sliding direction.

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