JP2022161667A - Pin ring and assembly structure using the same - Google Patents

Abstract

To provide a pin ring which can inhibit scraping of an inner wall surface of a screw hole during press-fitting, and to provide an assembly structure using the pin ring.SOLUTION: A cylindrical pin ring 4 is press-fitted in a screw hole of a first member and fitted in a through hole of a second member. At a first end part 401 which is one end part as seen in an axial direction Z, a thin protruding part 42 extending in the axial direction Z along an outer peripheral surface 43 is formed protruding from a body cylinder part 41. An inner peripheral surface 421 of the thin protruding part 42 is disposed at the outer periphery side relative to an inner peripheral surface 411 of the body cylinder part 41.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pin ring and an assembled structure using the same.

BACKGROUND ART Patent Document 1, for example, discloses an assembly structure assembled by fastening a plurality of members with bolts. Patent Document 1 relates to a bearing structure for a camshaft, and discloses an assembly structure assembled by fastening a cylinder head and a cam cap with bolts. In this assembly structure, a pin ring is used to determine the assembly position between the cylinder head and the cam cap. The pin ring is press-fitted into the enlarged diameter portion of the screwing hole (hereinafter also simply referred to as a screw hole), and the bolt is inserted inside the pin ring.

JP 2016-8559 A

However, when the pin ring is press-fitted into the screw hole, there is concern that the inner wall surface of the screw hole may be scraped. In such a case, it is conceivable that debris such as burrs may occur and drop into the screw hole. In this case, there is a concern that a problem such as debris getting caught between the female threaded portion and the bolt may occur.

The present invention has been made in view of such problems, and aims to provide a pin ring and an assembly structure using the same that can suppress scraping of the inner wall surface of a screw hole during press-fitting.

One aspect of the present invention is a cylindrical pin ring that is press-fitted into a screw hole of a first member and fitted into a through-hole of a second member,
A first end portion, which is one end portion in the axial direction, is formed with a thin protrusion extending axially along the outer peripheral surface from the main tubular portion,
The inner peripheral surface of the thin-walled projecting portion is located on a pin ring that is arranged on the outer peripheral side of the inner peripheral surface of the main body tubular portion.

Another aspect of the present invention is the pin ring,
the first member;
the second member;
a bolt inserted through the through hole of the second member and screwed into the screw hole of the first member;
The threaded hole has a female threaded portion and an inserted portion disposed closer to the second member than the female threaded portion and having an inner diameter larger than that of the female threaded portion,
A part of the pin ring is fitted in the fitted part,
The thin-walled protrusion is in an assembly structure disposed within the inset portion.

In the pin ring, the inner peripheral surface of the thin protruding portion is arranged on the outer peripheral side of the inner peripheral surface of the main tubular portion. That is, the thin protruding portion has a thickness smaller than that of the main tubular portion. Therefore, the rigidity of the thin protruding portion can be reduced.

When the pin ring is press-fitted into the screw hole from the first end side, the thin protrusion formed at the first end first comes into pressure contact with the inner wall surface of the screw hole. As described above, since the rigidity of the thin protrusion can be lowered, even if the thin protrusion is pressed against the inner wall surface of the screw hole, the deformation of the thin protrusion can suppress abrasion of the inner wall surface of the screw hole. . Since the thin protruding portion extends axially along the outer peripheral surface of the main tubular portion, the main tubular portion is smoothly press-fitted into the screw hole after the thin protruding portion is press-fitted into the screw hole. Therefore, even when the tubular main body is press-fitted into the screw hole, it is possible to prevent the inner wall surface from being scraped.

As described above, according to the above aspect, it is possible to provide a pin ring and an assembly structure using the pin ring that can suppress scraping of the inner wall surface of the screw hole during press-fitting.

Sectional drawing of the assembly structure using a pin ring in Embodiment 1. FIG. Sectional drawing of the pin ring along the axial direction in Embodiment 1. FIG. FIG. 2 is a cross-sectional view of a thin protrusion in Embodiment 1; IV arrow line view of FIG. Cross-sectional explanatory drawing of the manufacturing method of a pin ring in Embodiment 1. FIG. Cross-sectional explanatory drawing of the manufacturing method of a pin ring following FIG. Sectional drawing of the screw hole in Embodiment 1. FIG. FIG. 5 is a cross-sectional explanatory view showing a state immediately before the pin ring is press-fitted into the screw hole in the first embodiment; FIG. 5 is a cross-sectional explanatory view showing a state in which a pin ring is press-fitted into a screw hole in the first embodiment; FIG. 12 is a cross-sectional explanatory view of a specific example of the assembly structure in Embodiment 1, and is a cross-sectional view corresponding to the cross section taken along the line XX of FIG. 11; XI arrow line view of FIG. FIG. 5 is a cross-sectional explanatory view of the vicinity of the thin protruding portion immediately before press-fitting the pin ring into the screw hole in the first embodiment; Sectional drawing of the pin ring along the axial direction in Embodiment 2. FIG. FIG. 8 is a cross-sectional explanatory view showing a state immediately before press-fitting a pin ring into a screw hole in Embodiment 2; Sectional drawing of the pin ring along the axial direction in a comparative form.

In the above aspect of the pin ring, the thin protruding portion may have a chamfered portion at an outer peripheral corner portion of the protruding end. In this case, when the pin ring is press-fitted into the screw hole, the chamfered portion exhibits a guiding function, and the press-fitting work can be facilitated.

Further, the thickness of the thin protruding portion may be half or less of the thickness of the main tubular portion. In this case, the rigidity of the thin protruding portion can be further reduced, and scraping of the inner wall surface of the screw hole can be more effectively suppressed.

Further, the axial length of the thin protruding portion may be greater than or equal to the thickness of the main tubular portion. In this case, when the pin ring is press-fitted into the screw hole, the thin protruding portion is likely to be deformed. In other words, if the axial length of the thin protruding portion is long, the thin protruding portion is likely to be deformed with a relatively small pressing force when the distal end portion of the thin protruding portion is pressed against the inner wall surface of the screw hole. As a result, scraping of the inner wall surface of the screw hole can be more effectively suppressed.

Also, at the second end opposite to the first end, the thin-walled protruding portion may protrude from the main tubular portion. In this case, the operation of press-fitting the pin ring into the screw hole can be performed efficiently. That is, since the pin ring can be press-fitted into the screw hole from either the first end or the second end, there is no need to consider the direction when press-fitting the pin ring into the screw hole.

Further, the axial end portion of the main tubular portion on the inner peripheral side of the thin protruding portion may have a plane perpendicular to the axial direction. In this case, when the pin ring is press-fitted into the screw hole, the press-fitting work can be easily performed by applying a load to the plane. Here, the term "a plane orthogonal to the axial direction" includes not only the case where the plane is strictly orthogonal to the axial direction, but also the case where the plane is slightly inclined to the extent that the above effect can be obtained. The "plane perpendicular to the axial direction" preferably forms an angle of, for example, 80° to 100° with the axial direction.

(Embodiment 1)
An embodiment of a pin ring and an assembled structure using the same will be described with reference to FIGS. 1 to 12. FIG.
The pin ring 4 of this embodiment is a cylindrical pin ring that is press-fitted into the screw hole 11 of the first member 10 and fitted into the through-hole 21 of the second member 20, as shown in FIG.

As shown in FIG. 2 , in the pin ring 4 , a first end portion 401 , which is one end portion in the axial direction Z, has a thin wall extending in the axial direction Z along the outer peripheral surface 43 from the main tubular portion 41 . A protrusion 42 is formed to protrude.
The inner peripheral surface 421 of the thin protruding portion 42 is arranged on the outer peripheral side of the inner peripheral surface 411 of the main tubular portion 41 .

The main tubular portion 41 and the thin-walled projecting portion 42 form a continuous outer peripheral surface 43 . As shown in FIGS. 2 and 4, the pin ring 4 has a cylindrical shape. The thin protruding portion 42 is formed along the entire circumference of the first end portion 401 of the pin ring 4 . As shown in FIGS. 2 and 3, the thin protruding portion 42 has a chamfered portion 422 at the outer peripheral corner portion of the protruding end. The pin ring 4 also has a chamfered portion 44 at a corner portion on the outer peripheral side of the second end portion 402 opposite to the first end portion 401 . This chamfered portion 44 is also formed over the entire circumference of the second end portion 402 .

As shown in FIG. 3, in this embodiment, the thickness t2 of the thin projecting portion 42 is half or less than the thickness t1 of the main tubular portion 41 . Further, the axial length L2 of the thin protruding portion 42 is equal to or greater than the thickness t2. Further, the axial length L2 of the thin protruding portion 42 is equal to or greater than the thickness t1 of the main tubular portion 41 .

On the side of the first end portion 401 of the tubular body portion 41 , a body end face 412 facing the axial direction Z is provided on the inner peripheral side of the thin protruding portion 42 . An inner corner portion between the body end surface 412 and the inner peripheral surface 421 of the thin protrusion 42 is tapered or curved. Further, the chamfered portion 422 of the thin protruding portion 42 is formed at a position farther from the body cylindrical portion 41 than the body end face 412 .

Also, the distance in the axial direction Z between the main body end surface 412 and the edge of the chamfered portion 422 on the side closer to the main tubular portion 41 is defined as a distance L3. At this time, in the present embodiment, L3>t2 is satisfied, and L3≧t1 is also satisfied.

The pin ring 4 is made of metal such as steel, for example. An example of a method of manufacturing the pin ring 4 will be described below with reference to FIGS. 5 and 6. FIG.
Using a press die having a die 61, an outer punch 62 and an inner punch 63, a cylindrical pin ring material 40 made of steel is press molded.

As shown in FIG. 5, the die 61 is formed with a stepped portion 611 that supports one end of the pin ring material 40 . The outer punch 62 has a stepped portion 621 that abuts on the outer peripheral corner of the other end of the pin ring material 40 . The inner punch 63 has a stepped portion 631 that abuts on the inner peripheral corner of the other end of the pin ring material 40 .

As shown in FIG. 6, after the pin ring material 40 is placed on the die 61, the outer punch 62 and the inner punch 63 are pushed into the die 61 in the axial direction Z. As shown in FIG. As a result, the pin ring 4 having the thin protrusions 42 is formed between the die 61 , the outer punch 62 and the inner punch 63 .

The inner peripheral surface 421 of the thin protrusion 42 is formed by the outer peripheral surface of the stepped portion 631 of the inner punch 63 (see FIG. 2). The stepped portion 621 of the outer punch 62 forms the chamfered portion 422 and the outer peripheral surface of the thin projecting portion 42 (see FIG. 2). A stepped portion 611 of the die 61 forms the chamfered portion 44 of the second end portion 402 of the pin ring 4 (see FIG. 2).

As shown in FIG. 1, the pin ring 4 of this embodiment is used as positioning means for a first member 10 and a second member 20 which are assembled together by bolts 3. As shown in FIG. The pin ring 4 together with the first member 10 and the second member 20 form the assembly structure 1 described below.

The assembly structure 1 has a pin ring 4 , a first member 10 , a second member 20 and a bolt 3 . The bolt 3 is inserted through the through hole 21 of the second member 20 and screwed into the screw hole 11 of the first member 10 . The screw hole 11 has a female threaded portion 111 and an inserted portion 112 as shown in FIG. The fitted portion 112 is arranged closer to the second member 20 than the female threaded portion 111 and has a larger inner diameter than the female threaded portion 111 . As shown in FIG. 1, a portion of the pin ring 4 is fitted into the fitted portion 112 . In this embodiment, a portion of the pin ring 4 is press-fitted into the fitted portion 112 . In this embodiment, a portion of the pin ring 4 is press-fitted into the fitted portion 112 . The thin protruding portion 42 is arranged inside the inserted portion 112 .

When assembling the first member 10 and the second member 20 together, first, as shown in FIGS. The pin ring 4 is press-fitted into the opening of the fitted portion 112 from the first end portion 401 side.

Then, as shown in FIG. 9, the pin ring 4 is pushed into the fitted portion 112 to a predetermined position. However, part of the pin ring 4 is exposed from the inserted portion 112 of the screw hole 11 . That is, the pin ring 4 is attached to the fitted portion 112 with a portion of the second end portion 402 side protruding from the first member 10 . In this state, a portion of the cylindrical main body portion 41 of the pin ring 4 is press-fitted into the fitted portion 112 .

After that, the second member 20 is placed on the first member 10 as shown in FIG. Then, the bolt 3 is inserted into the through hole 21 of the second member 20 and screwed into the female screw portion 111 of the screw hole 11 of the first member 10 . At this time, the bolt 3 penetrates the inner peripheral side of the pin ring 4 .

As described above, the first member 10 and the second member 20 are positioned by the pin ring 4 and assembled together by the bolt 3 . Thereby, the assembly structure 1 is formed.

In this embodiment, the assembly structure 1 can be, for example, a bearing structure for a camshaft 51 as shown in FIGS. 10 and 11. FIG.
The bearing structure is a structure that rotatably supports the camshaft 51 with the cam housing CH and the cam cap CC. That is, in this embodiment, the cam housing CH is the first member 10 and the cam cap CC is the second member 20 .

A cam cap CC is fastened to the cam housing CH with bolts 3 at a plurality of locations. The cam cap CC has an arcuate shaft holding portion 201 and flange portions 202 formed on both end sides of the shaft holding portion 201 . A through hole 21 is formed in each of these flange portions 202 .

The cam housing CH has a bearing portion 101 that receives the camshaft 51 . Screw holes 11 are formed at positions opposite to each other with the bearing portion 101 interposed therebetween. A pin ring 4 is press-fitted into each of these screw holes 11, and a portion of the pin ring 4 protruding from the screw hole 11 is fitted into a through hole 21 of the cam cap CC. The camshaft 51 is held by cam caps CC at a plurality of locations in the longitudinal direction.

Next, the effects of this embodiment will be described.
In the pin ring 4 described above, the inner peripheral surface 421 of the thin protruding portion 42 is arranged closer to the outer peripheral side than the inner peripheral surface 411 of the main tubular portion 41 . That is, the thin protruding portion 42 has a thickness smaller than that of the main tubular portion 41 . Therefore, the rigidity of the thin protruding portion 42 can be reduced.

As shown in FIGS. 8 and 12, when the pin ring 4 is press-fitted into the screw hole 11 from the first end portion 401 side, the thin protruding portion 42 formed in the first end portion 401 is first pushed into the screw hole 11 . It is pressed against the wall surface 113 . Since the rigidity of the thin protruding portion 42 can be lowered as described above, even if the thin protruding portion 42 is pressed against the inner wall surface 113 of the screw hole 11 (the inner wall surface 113 of the inserted portion 112), the thin protruding portion 42 is deformed. Thus, scraping of the inner wall surface 113 of the screw hole 11 can be suppressed.

That is, if the first end portion 401 of the pin ring 4 were not formed with the thin protruding portion 42 (comparative embodiment described later, see FIG. 15), the rigidity of the first end portion 401 would be increased. When the first end portion 401 with high rigidity comes into pressure contact with the inner wall surface 113 of the screw hole 11, the first end portion 401 is unlikely to be deformed, and the inner wall surface 113 may be scraped. In particular, when the first member 10 is made of a material that is softer than the pin ring, the inner wall surface 113 may be scraped off and scraps may be generated.

On the other hand, in the pin ring 4 of this embodiment, when the thin protrusion 42 is pressed against the inner wall surface 113 of the screw hole 11, the thin protrusion 42 is easily deformed. As a result, the pressure contact force acting on the inner wall surface 113 of the screw hole 11 is relaxed, and the scraping of the inner wall surface 113 can be suppressed.

Since the thin protruding portion 42 extends in the axial direction Z along the outer peripheral surface 43 of the main tubular portion 41, after the thin protruding portion 42 is press-fitted into the screw hole 11, the main tubular portion 41 is inserted into the screw hole. 11 is smoothly press-fitted. That is, even if the thin protruding portion 42 is slightly deformed, the outer peripheral surface 43 of the thin protruding portion 42 and the main tubular portion 41 are smoothly connected to each other. is press-fitted into the fitted portion 112 of the screw hole 11 . Therefore, even when the main tubular portion 41 is press-fitted into the screw hole 11 , it is possible to prevent the inner wall surface 113 from being scraped.

Further, since the thin protruding portion 42 has the chamfered portion 422, when the pin ring 4 is press-fitted into the screw hole 11, the chamfered portion 422 exerts a guiding function, thereby facilitating the press-fitting operation.

Further, as shown in FIG. 3, the thickness t2 of the thin protruding portion 42 is less than half the thickness t1 of the main tubular portion 41 . Therefore, the rigidity of the thin protruding portion 42 can be further reduced, and scraping of the inner wall surface 113 of the screw hole 11 can be more effectively suppressed.

Further, the axial length L2 of the thin projecting portion 42 is equal to or greater than the thickness t1 of the main tubular portion 41 . Therefore, when the pin ring 4 is press-fitted into the screw hole 11, the thin protruding portion 42 is easily deformed. That is, if the axial length L2 of the thin protrusion 42 is long, when the tip of the thin protrusion 42 is pressed against the inner wall surface 113 of the screw hole 11, the thin protrusion 42 is easily deformed with a relatively small pressing force. As a result, scraping of the inner wall surface 113 of the screw hole 11 can be suppressed more effectively.

Further, in this embodiment, the distance L3 described above satisfies L3≧t1. Therefore, the thin protruding portion 42 can be made easier to deform. As a result, the above effects can be obtained more easily.

As described above, according to the present embodiment, it is possible to provide a pin ring capable of suppressing abrasion of the inner wall surface of the screw hole during press fitting.

(Embodiment 2)
As shown in FIGS. 13 and 14 , this embodiment is a form of the pin ring 4 in which a thin projecting portion 42 projects from the main tubular portion 41 also at the second end portion 402 .
In particular, in this embodiment, the pin ring 4 has a symmetrical shape in the axial direction Z. As shown in FIG.

Further, the axial end portion of the main tubular portion 41 on the inner peripheral side of the thin protruding portion 42 has a plane perpendicular to the axial direction Z. As shown in FIG. That is, the main body end face 412 shown in Embodiment 1 is provided on both the first end portion 401 and the second end portion 402 of the main tubular portion 41, and both have planes perpendicular to the axial direction Z. .

Press molding can also be used to manufacture the pin ring 4 of this embodiment. In this case, for example, the pin ring 4 of this embodiment can be obtained by changing the shape of the stepped portion 611 of the die 61 shown in FIG.
Others are the same as those of the first embodiment.

In the case of this embodiment, the work of press-fitting the pin ring 4 into the screw hole 11 can be performed efficiently. That is, since the pin ring 4 can be press-fitted into the screw hole 11 from either the first end portion 401 or the second end portion 402, there is no need to consider its orientation. As a result, productivity of the assembly structure 1 can be improved.

Further, the main body end face 412 has a plane perpendicular to the axial direction Z. As shown in FIG. Therefore, as shown in FIG. 14, when the pin ring 4 is press-fitted into the screw hole 11, by applying a load to the body end face 412, the press-fitting work can be easily performed. That is, the pin ring 4 can be pushed into the inserted portion 112 of the screw hole 11 by bringing a jig or the like into contact with the main body end surface 412 . As a result, the press-fitting work can be performed easily and smoothly.
In addition, it has the same effects as those of the first embodiment.

(comparative form)
As shown in FIG. 15, this embodiment is a form of a pin ring 9 without a thin protrusion.
The pin ring 9 of this embodiment has a shape in which the shape of the second end portion 402 shown in the first embodiment is also applied to the first end portion 401 .
Others are the same as those of the first embodiment.

(Experimental example)
This example is an example confirming the effects of the pin ring 4 of the first embodiment.
That is, the pin ring 4 of the first embodiment (see FIG. 2) and the pin ring 9 of the comparative example (see FIG. 15) were actually press-fitted into the fitted portion 112 of the screw hole 11 of the first member 10. (See FIGS. 8 and 9). After that, after pulling out the pin ring from the screw hole 11, the inner wall surface 113 of the inserted portion 112 in the screw hole 11 was observed.

The second member 20 used was made of an aluminum alloy. The pin rings 4 and 9 were made of steel. The interference between the inserted portion 112 of the screw hole 11 and the pin ring was set to 50 μm in diameter. This test was performed 10 times for each of the pin ring 4 of the first embodiment and the pin ring 9 of the comparative form, and the scraping amount generated on the inner wall surface 113 was measured. Evaluation was made by averaging the measurement values of the amount of scraping of these 10 times.

As a result, in the test using the pin ring 9 of the comparative form, the inner wall surface 113 of the inserted portion 112 of the screw hole 11 was scraped. In the test using the pin ring 4 of Embodiment 1 as well, the inner wall surface 113 was slightly scraped, but the amount of scraping was 1/4 or less of that of the comparative example. The scraping amount means the scraping depth of the inner wall surface 113 .

As described above, it was confirmed that the pin ring 4 provided with the thin protruding portion 42 was effective in suppressing abrasion of the inner wall surface 113 of the screw hole 11 .

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.
For example, the shape of the thin protruding portion can be changed as appropriate. Further, the first member and the second member are not limited to those shown in the above embodiments, and various members can be applied.

Reference Signs List 1 assembly structure 10 first member 11 screw hole 20 second member 21 through hole 3 bolt 4 pin ring 401 first end 402 second end 41 tubular main body 411 inner peripheral surface (of tubular main body) 42 thin protrusion Part 421 Inner peripheral surface (of thin protrusion) 43 Outer peripheral surface

Claims (7)

A cylindrical pin ring that is press-fitted into the screw hole of the first member and fitted into the through-hole of the second member,
A first end portion, which is one end portion in the axial direction, is formed with a thin protrusion extending axially along the outer peripheral surface from the main tubular portion,
The pin ring, wherein the inner peripheral surface of the thin protruding portion is arranged on the outer peripheral side of the inner peripheral surface of the main body tubular portion. 2. The pin ring according to claim 1, wherein said thin protrusion has chamfers at outer peripheral corners of the protruding end. 3. The pin ring according to claim 1 or 2, wherein the thickness of said thin protruding portion is less than half the thickness of said tubular body portion. The pin ring according to any one of claims 1 to 3, wherein the axial length of the thin protruding portion is equal to or greater than the thickness of the main tubular portion. The pin ring according to any one of claims 1 to 4, wherein the thin protruding portion protrudes from the main tubular portion also at a second end opposite to the first end. 6. The pin ring according to claim 5, wherein the axial end portion of the main tubular portion on the inner peripheral side of the thin protrusion has a plane orthogonal to the axial direction. A pin ring according to any one of claims 1 to 6;
the first member;
the second member;
a bolt inserted through the through hole of the second member and screwed into the screw hole of the first member;
The threaded hole has a female threaded portion and an inserted portion disposed closer to the second member than the female threaded portion and having an inner diameter larger than that of the female threaded portion,
A part of the pin ring is fitted in the fitted part,
The assembly structure, wherein the thin protruding portion is disposed within the inserted portion.

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