JP2020084814A - Rotary component for internal combustion engine - Google Patents

Abstract

To provide a rotary component for an internal combustion engine which can secure smooth rotation.SOLUTION: A rotary component 1 for an internal combustion engine has: a pair of support mediums 2 having bearing holes 21; a shaft member 3 which is inserted into the bearing holes 21 of the pair of support mediums 2 and rotatably supported; and removal prevention members 4 which fit in the shaft member 3 at the outer side of the support mediums 2 in an axial direction. The shaft member 3 has: a shaft supported part 31 disposed in the bearing holes 21; fixed parts 32 fixedly swaged to the removal prevention member 4 from the inner periphery side; and small diameter parts 33 formed between the shaft supported part 31 and the fixed part 32 and having an outer diameter smaller than those of the shaft supported part 31 and the fixed part 32.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotary component for an internal combustion engine, which is a component of the internal combustion engine.

As a component of the internal combustion engine, there are, for example, a rocker arm (hereinafter also referred to as a roller arm) having a roller and a rotating component such as a roller lifter. Such a rotary component for an internal combustion engine has a shaft member that axially supports a roller and a pair of supports that axially supports the shaft member.

Patent Document 1 proposes that the shaft member is rotatably supported with respect to the support body to extend the life of the bearing portion. Further, instead of caulking the shaft member to the support, a protruding portion of the shaft member is provided with a latching portion that can be latched to the support so that the shaft member does not come out of the bearing hole of the support. In addition to preventing it, it has been proposed to prevent deformation of the support.

JP, 2016-90006, A

However, the hooking portion is formed by deforming the end portion of the shaft member. Therefore, when the end portion of the shaft member is deformed, the pressing force acts not only on the end portion but also on the inner portion in the axial direction. Then, there is a possibility that the shaft member may be slightly deformed to the outside even in the axially inner portion of the hook portion. If this deformation also occurs in a portion of the support body that is inserted into the bearing hole, there is a concern that a part of the shaft support portion may interfere with the inner circumference of the bearing hole. Then, it can be said that there is room for improvement in terms of smooth rotation of the rotating parts.

The present invention has been made in view of such a background, and an object of the present invention is to provide a rotating component for an internal combustion engine that can ensure smooth rotation.

One embodiment of the present invention, a pair of supports having bearing holes,
A shaft member that is rotatably supported by being inserted into the bearing holes of the pair of supports,
A retaining member fitted to the shaft member on the outer side of the support in the axial direction,
The shaft member is formed between the shaft-supported portion arranged in the bearing hole, the fixed portion which is caulked and fixed to the retaining member from the inner peripheral side, and the shaft-supported portion and the fixed portion. A rotary component for an internal combustion engine having a small diameter portion having an outer diameter smaller than that of the shaft supported portion and the fixed portion.

The rotary component for an internal combustion engine has a retaining member that fits into the shaft member. Accordingly, it is possible to prevent the shaft member from moving in the axial direction with respect to the support body and coming off from the bearing hole. The shaft member has the small diameter portion between the shaft-supported portion and the fixed portion. This can prevent the supported shaft portion from being deformed when the fixed portion is formed. As a result, smooth rotation of the shaft member with respect to the support can be ensured.

As described above, according to the above aspect, it is possible to provide a rotating component for an internal combustion engine, which can ensure smooth rotation.

3 is a perspective view of a rotary component (roller arm) for an internal combustion engine according to the first embodiment. FIG. II-II sectional view taken on the line in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 2. FIG. 5 is a side view of the shaft member and the retaining member, which is equivalent to the view of the arrow V in FIG. 2. FIG. 3 is a perspective view of a pre-deformation member according to the first embodiment. FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6. FIG. 3 is a cross-sectional explanatory view of the first embodiment immediately before caulking and fixing the shaft member to the retaining member. FIG. 6 is a perspective view of a rotating component according to comparative form 1. FIG. 6 is an enlarged cross-sectional explanatory view for explaining the interference between the deformed portion of the shaft member and the support body and the rolling element in the first comparative embodiment. Sectional drawing explaining the non-interference of the deformed part of a shaft member, a support body, and a rolling element in Embodiment 1. FIG. 6 is a sectional view of a rotary component for an internal combustion engine according to the second embodiment. FIG. 6 is a front view of a rotary component (roller lifter) for an internal combustion engine according to a third embodiment. FIG. 6 is a side view of a rotary component (roller lifter) for an internal combustion engine according to the third embodiment.

In the rotating component for an internal combustion engine, the shaft-supported portion may have a hardness higher than that of the fixed portion. In this case, when the fixed portion is deformed, the deformation of the shaft-supported portion can be more reliably suppressed. As a result, smooth rotation of the rotating component can be ensured more easily.

In addition, the shaft-supported portion may have an annular side end surface facing the outside in the axial direction on the small diameter portion side. In this case, a step is formed between the shaft-supported portion and the small diameter portion. As a result, it is possible to effectively prevent the deformation load acting on the fixed portion from being transmitted to the outer peripheral surface of the shaft supported portion. As a result, the deformation of the shaft-supported portion can be prevented more reliably.

The rotating component may further include an annular roller rotatably supported by the shaft member, and the roller may be arranged between the pair of support bodies in the axial direction. it can. In this case, smooth rotation of the shaft member with respect to the support and smooth rotation of the roller with respect to the shaft member can be ensured.
Examples of such rotating parts for an internal combustion engine include parts such as a roller arm and a roller lifter.

(Embodiment 1)
An embodiment of a rotary component for an internal combustion engine will be described with reference to FIGS.
As shown in FIGS. 1 to 4, the rotary component 1 of the present embodiment has a pair of support bodies 2, a shaft member 3, and a retaining member 4. The support 2 has a bearing hole 21. The shaft member 3 is inserted into the bearing holes 21 of the pair of supports 2 and is rotatably supported. The retaining member 4 is fitted to the shaft member 3 outside the support body 2 in the axial direction.

The shaft member 3 has a supported portion 31, a fixed portion 32, and a small diameter portion 33 formed between the supported portion 31 and the fixed portion 32. The shaft-supported portion 31 is a portion arranged in the bearing hole 21. The fixed portion 32 is a portion that is caulked and fixed to the retaining member 4 from the inner peripheral side. The small-diameter portion 33 has a smaller outer diameter than the supported portion 31 and the fixed portion 32.

The supported shaft portion 31 has a higher hardness than the fixed portion 32. The shaft-supported portion 31 may have a Vickers hardness higher than that of the fixed portion 32, for example. The shaft-supported portion 31 has, on the side of the small diameter portion 33, an annular side end surface 311 facing outward in the axial direction. It further has an annular roller 5 rotatably supported by the shaft member 3. The roller 5 is arranged between the pair of support bodies 2 in the axial direction. The support 2, the shaft member 3, the retaining member 4, and the roller 5 are made of metal.

The rotary component 1 for an internal combustion engine of this embodiment is a roller arm. The rotary component 1, which is a roller arm, has an arm body 20 and a roller 5 rotatably attached to the arm body 20. As a part of the arm body 20, a pair of supports 2 is provided. The roller 5 is rotatably supported by the arm body 20 via the shaft member 3.

The arm body 20 also has a fulcrum engaging portion 221 that engages with a swing fulcrum member (not shown), and an abutting portion 222 that abuts with a base end portion of a valve body (not shown). Accordingly, the roller arm is configured such that when the roller 5 is pushed by the rotating cam, the arm body 20 swings around the fulcrum engagement portion 221 as a fulcrum, and the contact portion 222 pushes the valve body.

As shown in FIG. 3, a plurality of rolling elements 11 are arranged side by side in the circumferential direction between the roller 5 and the shaft member 3. That is, a plurality of rolling elements 11 are circumferentially arranged between the outer peripheral surface of the cylindrical shaft member 3 and the inner peripheral surface of the cylindrical roller 5. Each rolling element 11 has a columnar shape and is arranged in a state where its axial direction is parallel to the axial direction of the shaft member 3. The rolling element 11 is in rollable contact with the outer peripheral surface of the shaft member 3 and the inner peripheral surface of the roller 5.

As shown in FIG. 2, the shaft member 3 has a central shaft support 30 that rotatably supports the roller 5 via the rolling elements 11 between a pair of shaft supported parts 31 in the axial direction. The central shaft support portion 30 and the pair of shaft-supported portions 31 have the same outer diameter. The outer peripheral surface of the central shaft support portion 30 and the outer peripheral surface of the pair of shaft-supported portions 31 form a continuous outer peripheral surface of a cylindrical body. The portion including the central shaft supporting portion 30 and the pair of shaft supported portions 31 has higher hardness than the fixed portion 32.

As shown in FIG. 4, the shaft-supported portion 31 is slidably supported in a circular bearing hole 21. The small diameter portion 33 is formed over the entire circumference of the shaft member 3 outside the shaft-supported portion 31 in the axial direction.

The fixed portion 32 has a larger diameter than the small diameter portion 33. As shown in FIGS. 2 and 5, the outer peripheral surface of the fixed portion 32 is in pressure contact with the inner peripheral surface of the annular retaining member 4. That is, the fixed portion 32 is caulked on the inner peripheral side of the retaining member 4. Annular grooves 36 are formed on the end faces of the shaft member 3 at both ends in the axial direction.

Next, a method for manufacturing the rotary component 1 for an internal combustion engine of this embodiment will be described with reference to FIGS. 6 to 8.
First, in obtaining the shaft member 3, a pre-deformation member 3a shown in FIGS. 6 and 7 is prepared as a metal member before the fixed portion 32 is formed. The pre-deformation member 3a has a large-diameter cylindrical portion 31a and a pair of small-diameter cylindrical portions 33a formed on both sides in the axial direction thereof. The small-diameter cylindrical portion 33a has a smaller diameter than the large-diameter cylindrical portion 31a. The rotation center axes of the large-diameter cylindrical portion 31a and the two small-diameter cylindrical portions 33a coincide with each other. At least the outer peripheral surface of the large-diameter cylindrical portion 31a is a highly accurate cylindrical outer peripheral surface.

The large-diameter cylindrical portion 31a of the pre-deformation member 3a is quenched. Thereby, the hardness of the large-diameter cylindrical portion 31a is increased. On the other hand, the small diameter cylindrical portion 33a is not quenched. As a result, the hardness of the large-diameter cylinder portion 31a is increased without increasing the hardness of the small-diameter cylinder portion 33a too much.

Next, as shown in FIG. 8, the pre-deformation member 3a is inserted into the pair of support bodies 2 while the rolling elements 11 and the rollers 5 are assembled to the pre-deformation member 3a. Then, the retaining members 4 are arranged on the outer peripheral sides of the two small-diameter cylindrical portions 33a, respectively. In this state, the punch 6 is pressed against the end surface of the pre-deformation member 3a to deform the small diameter cylindrical portion 33a.

The punch 6 has an annular continuous protrusion 61 at its tip. The protrusion 61 is pressed so as to bite into the end surface of the small-diameter columnar portion 33a. As a result, the small-diameter columnar portion 33a is deformed so as to be expanded in the radial direction. As a result, as shown in FIG. 2, the outer peripheral surface of the expanded small-diameter columnar portion 33a comes into pressure contact with the inner peripheral surface of the retaining member 4, and becomes the fixed portion 32. As a bite of the punch 6, an annular groove 36 is formed on the end surface of the shaft member 3 as shown in FIGS. 2 and 5.

The two fixed portions 32 existing at both ends of the shaft member 3 may be formed at one time by simultaneously pressing the two punches 6 against the pre-deformation member 3a. Alternatively, the two small diameter cylindrical portions 33a may be deformed one by one to form the fixed portions 32 one by one. In this case, one end in the axial direction of the pre-deformation member 3a is supported by a support member (not shown), and the other end of the pre-deformation member 3a is deformed by the punch 6, thereby forming one fixed portion 32. be able to. Next, the other fixed portion 32 can be formed by forming the fixed portion 32 on the other end side in the same manner.

The projection 61 of the punch 6 does not have to be a circular ring shape in particular, and for example, one or a plurality of circular arc-shaped ones such as a substantially C-shape or a substantially semi-circular shape may be formed. You can also do it. In such a case, it can be considered that the punch 6 is pushed into the end surface of the pre-deformation member 3a a plurality of times in a posture in which the punch 6 is rotated about the central axis by a predetermined angle.

Next, the function and effect of this embodiment will be described.
The rotary component 1 for an internal combustion engine has a retaining member 4 that fits into the shaft member 3. Thereby, it is possible to prevent the shaft member 3 from moving in the axial direction with respect to the support body 2 and coming off from the bearing hole 21. The shaft member 3 has a small diameter portion 33 between the shaft-supported portion 31 and the fixed portion 32. Accordingly, it is possible to prevent the shaft-supported portion 31 from being deformed when the fixed portion 32 is formed. As a result, smooth rotation of the shaft member 3 with respect to the support 2 can be ensured.

That is, when forming the fixed portion 32, as described above, a part of the small-diameter cylindrical portion 33a is deformed and the diameter thereof is expanded. At this time, if the shaft member 3 does not have the small diameter portion 33, it is conceivable that the deformation load is transmitted to the shaft-supported portion 31 and the outer peripheral surface of the shaft-supported portion 31 is deformed. Even if the outer peripheral surface of the shaft-supported portion 31 is slightly deformed, the deformed portion may interfere with the bearing hole 21 to prevent smooth rotation of the shaft member 3.

On the other hand, in the rotating component 1 of this embodiment, the shaft member 3 includes the small diameter portion 33. As a result, even when the deformation load is transmitted to the inner side in the axial direction of the supported portion 31 when forming the fixed portion 32, the fixed portion 32 is affected even to the outer peripheral surface of the supported portion 31 inside the small diameter portion 33. Can be prevented.

Further, the shaft-supported portion 31 has a hardness higher than that of the fixed portion 32. Therefore, when the fixed portion 32 is deformed, the deformation of the shaft-supported portion 31 can be more reliably suppressed. As a result, smooth rotation of the rotary component 1 can be more easily ensured.

Further, the shaft-supported portion 31 has an annular side end surface 311. Therefore, a step is formed between the shaft-supported portion 31 and the small diameter portion 33. Thereby, it is possible to effectively prevent the deformation load acting on the fixed portion 32 from being transmitted to the outer peripheral surface of the shaft supported portion 31. As a result, the deformation of the shaft-supported portion 31 can be prevented more reliably.

Further, the rotary component 1 has a roller 5, and the roller 5 is arranged between the pair of supports 2. In such a rotary component 1, by adopting the configuration of the shaft member 3 as described above, smooth rotation of the shaft member 3 with respect to the support body 2 and smooth rotation of the roller 5 with respect to the shaft member 3 are ensured. be able to.

That is, in the case of the rotary component 1 including the roller 5 having the above-described configuration, if the shaft member 3 does not have the small-diameter portion 33, the deformation load of the fixed portion 32 causes not only the shaft-supported portion 31 but also the roller. There is also a concern that it may propagate to a portion arranged on the inner peripheral side of 5. Therefore, by providing the shaft member 3 with the small diameter portion 33, it is possible to suppress the deformation of the portion of the shaft member 3 arranged on the inner peripheral side of the roller 5, that is, the central shaft support portion 30. As a result, smooth rotation of the roller 5 with respect to the shaft member 3 can be ensured.

As described above, according to this embodiment, it is possible to provide a rotating component for an internal combustion engine, which can ensure smooth rotation.

(Comparative form 1)
As shown in FIG. 9, the present embodiment is a form of the rotary component 9 in which the expanded locking portions 932 are provided on both ends of the shaft member 93.
In this embodiment, the retaining member 4 is not provided, and the retaining portion 932 provided on the shaft member 93 prevents the shaft member 93 from coming off from the bearing hole 21. The shaft member 93 has a central shaft supporting portion 930 arranged inside the roller 5 and two shaft supported portions 931 which are located outside the central shaft supporting portion 930 and are supported by the support body 2.

Others are the same as in the first embodiment. In addition, among the reference numerals used in the first comparative example, the same reference numerals as those used in the above-described embodiments represent the same components and the like as those in the above-described embodiments, unless otherwise specified.

In the case of such a configuration, when the hooking portion 932 is formed, the shaft-supported portion 931 inside thereof may be slightly deformed. That is, when the hooking portion 932 is formed, the end portion of the shaft member 93 is deformed by a punch or the like, similarly to the method of forming the fixed portion 32 in the rotary component 1 of the first embodiment. At this time, the deformation load is also transmitted to the shaft-supported portion 931 and may slightly deform, as shown in FIG. 10, so that the shaft-supported portion 931 expands in diameter.

Then, the deformed portion of the shaft-supported portion 931 may interfere with the support 2.
Furthermore, there is a concern that the above-mentioned deformation load may affect the central shaft support portion 930 further inside than the supported shaft support portion 931. In such a case, the deformed portion of the central shaft support portion 930 may interfere with the rolling elements 11.

As a result, there is a concern that smooth rotation of the shaft member 93 with respect to the support body 2, smooth rolling of the rolling element 11 with respect to the shaft member 93, and eventually smooth rotation of the roller 5 may be hindered.

On the other hand, with the configuration of the first embodiment, as described above, the smooth rotation of the shaft member 3 with respect to the support body 2 and the smooth rotation of the roller 5 with respect to the shaft member 3 are ensured. You can

That is, also in the first embodiment, a large deformation load acts on the shaft member 3 when forming the fixed portion 32. However, by providing the shaft member 3 with the small diameter portion 33, even if the fixed portion 32 is deformed as shown in FIG. 11, the influence of the deformation is stopped at the small diameter portion 33. As a result, it is possible to prevent the deformation load from affecting the outer peripheral surface of the shaft-supported portion 31 and the outer peripheral surface of the central shaft-supporting portion 30, which are portions axially inward of the small diameter portion 33. As a result, it is possible to prevent the deformed portion of the shaft member 3 from interfering with the support body 2 and the rolling elements 11 arranged on the outer periphery thereof.
10 and 11, the alternate long and short dash line shows a part of the outer contour of the shaft member before deformation.

(Embodiment 2)
As shown in FIG. 12, this embodiment is a rotary component 1 for an internal combustion engine in which a retaining member 4 is fitted only to one end of a shaft member 3.
That is, the rotary component 1 of the present embodiment has the flange portion 37 having a larger diameter than the bearing hole 21 at the other end of the shaft member 3. The collar portion 37 is arranged outside the support body 2 in the axial direction.

The shaft member 3 is fitted to the retaining member 4 at the end portion on the side opposite to the flange portion 37. That is, the shaft member 3 has the fixed portion 32 at the end portion on the side opposite to the flange portion 37. The shaft member 3 has a small diameter portion 33 between the fixed portion 32 and the shaft supported portion 31.

Others are the same as in the first embodiment. In addition, among the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the already-described embodiments represent the same components and the like as those in the already-described embodiments, unless otherwise specified.

In this embodiment, since the retaining member 4 is provided as one, the number of parts can be reduced. Further, since the fixed portion 32 may be formed only on the one end side of the shaft member 3, the number of manufacturing steps can be reduced.
Other than that, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
In this embodiment, as shown in FIGS. 13 and 14, the rotary component 1 for an internal combustion engine is a roller lifter.
The roller lifter is used, for example, as a pump lifter in a fuel supply pump. The roller lifter is arranged in the cylinder and is configured to reciprocate in response to the rotation of the cam.

As shown in FIGS. 13 and 14, the roller lifter (rotary component 1) has a lifter main body 200 having a sliding surface on the outer peripheral side and a roller 5 rotatably attached to the lifter main body 200. The lifter main body 200 includes a pair of supports 2, and a shaft member 3 is rotatably supported in a bearing hole 21 provided in the supports 2. The roller lifter is attached to the internal combustion engine so that the outer peripheral surface of the roller 5 contacts the cam.

The configurations of the support body 2, the shaft member 3, the retaining member 4, the roller 5, and the like are the same as those in the first embodiment. Further, the assembling state of these members and the like is similar to that of the first embodiment.
Others are the same as in the first embodiment.

Also in the case of this embodiment, it is possible to provide a roller lifter capable of ensuring smooth rotation, as in the first embodiment.
Other than that, the same effects as those of the first embodiment are obtained.

In the above-described embodiment, the rotary component for the internal combustion engine is the roller arm or the roller lifter, but the rotary component for the internal combustion engine of the present disclosure is not limited to these. For example, the rotating component for an internal combustion engine can be another component such as a roller tappet.

DESCRIPTION OF SYMBOLS 1 Rotating part for internal combustion engine 2 Support body 3 Shaft member 31 Shaft support part 32 Fixed part 33 Small diameter part 4 Fall-out prevention member

Claims (4)

A pair of supports having bearing holes,
A shaft member that is rotatably supported by being inserted into the bearing holes of the pair of supports,
A retaining member fitted to the shaft member on the outer side of the support in the axial direction,
The shaft member is formed between the shaft-supported portion arranged in the bearing hole, the fixed portion which is caulked and fixed to the retaining member from the inner peripheral side, and the shaft-supported portion and the fixed portion. A rotary component for an internal combustion engine, comprising: the shaft-supported portion and a small-diameter portion having an outer diameter smaller than that of the fixed portion. The rotating component for an internal combustion engine according to claim 1, wherein the shaft-supported portion has a hardness higher than that of the fixed portion. The rotary component for an internal combustion engine according to claim 1 or 2, wherein the shaft-supported portion has an annular side end surface facing outward in the axial direction on the small diameter portion side. The annular roller rotatably supported by the shaft member is further provided, and the roller is arranged between the pair of support bodies in the axial direction. A rotating component for an internal combustion engine as described.

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