WO2009128141A1

WO2009128141A1 - Assembling part and method of assembling same

Info

Publication number: WO2009128141A1
Application number: PCT/JP2008/057338
Authority: WO
Inventors: 峻荻野
Original assignee: 佐藤義則
Priority date: 2008-04-15
Filing date: 2008-04-15
Publication date: 2009-10-22

Abstract

An assembling part is formed by assembling a joining member including a head part formed at one end of its shaft part and an intervening member including a loose-insert hole having an inner diameter larger than the outer diameter of the shaft part and made of a material softer than the joining member to each other by insertion of the shaft part of the joining member into the loose-insert hole of the intervening member. An external force parallel to the center axis of the shaft part is applied to the peripheral edge part of the loose-insert hole, whereby the intervening member is elastically deformed and reduced in its diameter at only the peripheral edge part.

Description

Assembly parts and assembly method

The present invention relates to an assembling part in which a coupling member such as a bolt, a sealing bolt, a screw plug, an oil filter bolt or an oil bolt and an intervening member such as a washer are assembled, and an assembling method thereof.

As this type of assembly component, for example, there is a configuration disclosed in Patent Document 1.
The assembly part disclosed in Patent Document 1 is provided with a constricted portion having a reduced shaft diameter in the vicinity of a head connecting portion of a shaft portion of a bolt having a head portion and a shaft portion provided with a screw. The washer has a structure in which the washer is deformed in the radial direction and assembled non-detachably.
JP 58-166115 A

However, in the assembly component described in Patent Document 1, since the constricted portion is provided in the shaft portion, the mechanical strength may be reduced.
In addition, since the washer is deformed by applying an external force in the radial direction, the washer has been deformed into a so-called elliptical shape.
For this reason, when applied to a screwed portion that requires liquid tightness to a liquid such as oil, from between the bolt and the washer, between the washer and the screwed portion, or between the shaft portion and the washer. However, the problem that liquid such as oil is likely to leak out and cannot be used in a portion where liquid tightness is required remains unsolved.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an assembling part that is easily improved in liquid tightness and that is low in cost and excellent in mass productivity without causing a decrease in mechanical strength, and an assembling method thereof.

The assembly component according to the present invention includes a coupling member having a head formed at one end of the shaft portion, a loose insertion hole having an inner diameter larger than the outer diameter of the shaft portion, and is softer than the coupling member. An interposition member formed of a different material by inserting the shaft portion of the coupling member into the loose insertion hole of the interposition member, and the interposition member has a peripheral edge of the loose insertion hole An external force parallel to the central axis of the shaft portion is applied to the portion, and only the peripheral portion of the loose insertion hole is plastically deformed to reduce the diameter.

The method of assembling the assembly part according to the present invention is such that the loose insertion hole of the interposed member is inserted into the shaft portion of the coupling member and only the peripheral edge of the loose insertion hole of the interposed member is in contact. After the assembly part is placed on a die having a cylindrical projecting contact portion, this is inserted into an interposed member sandwiched between the seating surface of the head of the coupling member and the contact portion. It is intended to apply an external force parallel to the central axis of the shaft portion to the peripheral portion of the hole, and to plastically deform only the peripheral portion of the loose insertion hole to reduce the diameter.

According to the present invention, liquid-tightness can be easily improved, and an assembling part and an assembling method thereof that are low in cost and excellent in mass productivity can be provided without causing a decrease in mechanical strength.

(A) is a plan view of an assembly component according to the first embodiment of the present invention, (B) is a partial front sectional view showing a part of the assembly component in cross section, and (C) is an intermediate It is a top view of a mounting member. It is the elements on larger scale of the part shown by the surrounding line I in FIG. (A) is a schematic explanatory drawing which shows the structure of the principal part of a shaping | molding apparatus, (B) is a top view of the die | dye which makes a part of shaping | molding apparatus. (A) is sectional drawing of a crimping die, (B) is an enlarged view of the part shown by the surrounding line II shown to (A). (A) to (D) are explanatory views showing the assembly process of the assembly component A1 ′ over time. It is a fragmentary sectional view which shows a mode that assembly | attachment component A1 was screwed by the side wall surface of the to-be-threaded part. (A) is a front view showing a part of the assembly part according to the second embodiment in cross section, (B) is a front view showing a part of the assembly part according to the third embodiment in cross section. FIG. A part of the assembly part where the washer is assembled to the sealing bolt of М10 is shown in cross section. (A) is the state before diameter reduction (caulking), (B) is diameter reduction. It is a front view which shows the state after performing (caulking process). A part of the assembly part where the washer is assembled to the sealing bolt of М24 is shown in cross section, (A) is the state before diameter reduction (caulking), and (B) is diameter reduction. It is a front view which shows the state after performing (caulking process).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connection member 11 Head part 13 Shaft part 13a Screw 20 Interposition member 21 Loose insertion hole 22 Thin part (periphery part of loose insertion hole)
30 Punch 40 Die 43 Abutting portion 63 Fitting grooves A1 to A3 Assembly part O1 Center axis

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1A is a plan view of an assembly part according to the first embodiment of the present invention, FIG. 1B is a partial front sectional view showing a part of the assembly part in section, and FIG. FIG. 2 is a partially enlarged view of a portion indicated by a surrounding line I in FIG.

The assembly part A1 according to the first embodiment is an assembly of the coupling member 10 and the interposition member 20, and details thereof are as follows.
The connecting member 10 is called a screw plug or a sealing bolt in the present embodiment, and is made of, for example, carbon steel for machine structure, alloy steel for machine structure, stainless steel, or the like.

The coupling member (hereinafter simply referred to as “bolt”) 10 includes a hexagonal flanged head (hereinafter simply referred to as “head”) 11 integrally formed with a flange 12 and one end of a shaft portion 13. Is formed.
A screw 13a is continuously formed on the outer peripheral surface of the shaft portion 13 from the lower neck portion, which is a connecting portion with the head portion 11, to the other end.

The interposition member 20 is a washer formed of a softer material than the material of the bolt 10, for example, a non-ferrous metal such as aluminum or copper (hereinafter simply referred to as “washer”). The outer diameter D1 is slightly larger than the outer diameter, and the inner circumferential wall surface 21a of the loose insertion hole 21 has a disk shape that is reduced in diameter so as to contact the outer circumferential surface of the shaft portion 13.
The washer 20 is not limited to the non-ferrous metal such as aluminum or copper, and may be formed of a known material that is softer than the material of the bolt 10.

The loose insertion hole 21 is plastically deformed so as to reduce the diameter of the loose insertion hole 21 by applying an external force parallel to the central axis O1 of the bolt 10 only to the peripheral edge portion. Annular thin portions 22 are coupled with a constant width W1.
In the present embodiment, as described above, the diameter of the loose insertion hole 21 is reduced so that the inner peripheral wall surface 21 a of the loose insertion hole 21 abuts on the outer peripheral surface of the shaft part 13. It is not necessary to abut on the outer peripheral surface.
The width W1 may be set as appropriate in consideration of the size and material of the interposed member.

The thin-walled portion 22 is formed by deforming only one surface of the washer 20. In this embodiment, it is formed in the lower surface 20a which goes to the die | dye 40 mentioned later, The cross-sectional shape is formed as a level | step difference of the cross-section L shape substantially corresponding to the cross-sectional shape of the contact part 43 mentioned later.

Further, the thickness t1 (see FIG. 2) of the thin portion 22 is about 1/2 to 1/3 of the plate thickness t of the washer 20.
The thin portion is not limited to one formed by deforming only one of the washer 20 surfaces, and may be formed on both surfaces.

Next, a molding apparatus for molding the washer 20 of the assembly part A1 described above will be described with reference to FIGS. 3A is a schematic explanatory view showing the configuration of the main part of the molding apparatus, FIG. 3B is a plan view of a die that forms part of the molding apparatus, and FIG. 4A is a cross-sectional view of a caulking die, (B) is an enlarged view of a portion indicated by an encircling line II shown in (A), and FIGS. 5 (A) to (D) are explanatory views showing an assembling process of the assembling part A1 ′ over time.
In FIG. 5, an assembly part indicated by A <b> 1 ′ indicates that a washer 20 ′ (hereinafter simply referred to as “washer 20 ′”) before being molded is assembled to the bolt 10.
The inner diameter D2 of the washer 20 ′ is larger than the outer diameter of the shaft portion 13.

As shown in FIG. 3, the forming apparatus B is configured to include a punch 30 and a die 40,

driving units

50 and 51, and a controller C that are disposed above and below the center axis O <b> 1.
The punch 30 and the die 40 are disposed so as to coincide with the central axis O1 and in a vertical positional relationship with each other.

The die 40 includes a cylindrical outer cylinder die 41 having an inner diameter corresponding to the outer diameter D1 of the washer 20 ′ described above, and a cylindrical caulking die 42 disposed in the outer cylinder die 41 so as to be vertically slidable. It is comprised.
The drive unit 50 is for driving the die 40 up and down, and the drive unit 51 is for driving the punch 30 up and down.

The controller C is for driving the driving

units

50 and 51 at predetermined timings, and a timing signal line (not shown) for inputting a timing signal sent from the outside is input to the controller C. ) And the

drive units

50 and 51 are connected to the output side.

As described above, in the present embodiment, since the inner diameter of the outer cylinder die 41 is made to coincide with the outer diameter D1 of the washer 20 ′, positioning can be performed only by placing the assembly part A1 ′ on the crimping die 42. It can be carried out. This facilitates automation.

The caulking die 42 is formed in a cylindrical shape with an abutting portion 43 integrally projecting on a washer-facing surface 44 a of a cylindrical main body 44 and having an inner diameter that matches the outer diameter of the shaft portion 13 of the bolt 10. Yes.
By forming the cylinder 10 with an inner diameter that matches the outer diameter of the shaft portion 13 of the bolt 10, the bolt 10 of the assembly part A 1 ′ placed on the contact portion 43 is firmly held and positioned. be able to.

The abutting portion 43 is for plastically deforming and reducing the diameter of only the peripheral edge portion of the loose insertion hole 21 and has a required width W2 so as to abut only the peripheral edge portion of the loose insertion hole 21 of the washer 20 ′. (See FIG. 3B) and is formed in a cylindrical shape that coincides with the central axis O1.
Specifically, as shown in detail in FIGS. 4A and 4B, by gradually inclining the outer peripheral wall surface 43a toward the inner peripheral side, the width gradually increases from the proximal end portion toward the distal end portion (the upper end portion in the figure). Is formed in a trapezoidal cross section.

The contact end face 43b of the contact portion 43 is formed to be inclined at a predetermined angle that falls downward from the outer edge portion 43c toward the inner edge portion 43d.
In the present embodiment, the inclination angle θ1 of the contact end face 43b is set to about 1 degree, and the inclination angle θ2 of the outer peripheral wall surface 43a is set to about 80 degrees.

By setting the inclination angle θ1 to about 1 degree, the diameter reduction rate of the loose insertion hole 21 can be made larger than when the contact end face 43b is not inclined.
That is, by appropriately setting the inclination angle θ1 of the contact end face 43b, the diameter reduction rate of the loose insertion hole 21 can be changed without changing the clamping force (pressing force) between the punch 30 and the die 40. is there.
Further, the outer peripheral wall surface 43a is provided with an inclination angle θ2 so that it can be caulked more easily, but it does not necessarily have to be inclined.

The above-described crimping die 42 has an initial position (A) in which the upper half of the washer 20 ′ that is placed on and abutted on the abutting portion 43 projects slightly above the upper end surface 41 a of the outer cylinder die 41 (FIG. 5A )), And the entire washer 20 'is moved to the component removal position (A) slightly protruding above the upper end surface 41a of the outer cylinder die 41.

The punch 30 has a cylindrical shape having the same outer diameter as the outer cylinder die 41 described above, and the lower surface 30a of the punch 30 abuts against the head 11 of the assembly part A1 ′ placed on the crimping die 42. It is a contact surface.
The punch 30 is reciprocated between a diameter reduction completion position indicated by (c) in FIG. 5 and a standby position (d) spaced above the diameter reduction completion position (c). It has become.

A process of reducing the diameter of the assembly part A1 ′ (caulking) by the molding apparatus B described above will be described with reference to FIG.
The assembly process of the assembly part A1 includes an assembly process of the washer 20 'and the bolt 10, a diameter reduction process (caulking process) by the forming apparatus B, and a process of taking out the assembly part A1 subjected to the diameter reduction process. Each process is automated.

First, in the assembling step, the washer 20 'and the bolt 10 are connected by inserting the loose insertion hole 21 of the washer 20' into the shaft portion 13 of the bolt 10 by using, for example, a parts feeder (not shown) using vibration. Assemble.
Next, the assembled part A1 'is handled and placed on the crimping die 42 of the molding apparatus B as shown in FIG.

When the assembly part A1 'is placed and positioned on the crimping die 42, as shown in FIG. 5 (B), the punch 30 is driven downward to contact the head 11 of the bolt 10 of the assembly part A1'.
When the punch 30 in contact with the head 11 of the bolt 10 of the assembly part A1 ′ is further lowered,
The peripheral portion of the loose insertion hole 21 of the washer 20 ′ sandwiched between the seat surface 12 a of the head 11 of the bolt 10 and the caulking die 42 is pressed by the contact portion 43, and the lower surface of the peripheral portion is gradually recessed according to this pressing. Deform.

In accordance with the above-described concave deformation, the loose insertion hole 21 is plastically deformed so as to gradually reduce the diameter, and as shown in FIG. 5C, when the punch 30 is lowered to the diameter reduction completion position (c), the loose insertion hole 21 21 has a required inner diameter, and a thin-walled portion 22 having a cross-sectional shape corresponding to the abutting portion 43 is formed at a peripheral thickness of the loose insertion hole 21 with a required thickness.

When the punch 30 is lowered to the diameter reduction completion position (c), the caulking die 42 is then driven up, and the punch 30 is also driven up to return to the standby position (d).
Then, the assembly part A1 at the part removal position (A) is moved to the next process by a handling mechanism (not shown).

FIG. 6 is a partial cross-sectional view showing a state where the assembly component A1 is screwed onto the side wall surface of the screwed portion.
As shown in the figure, for example, when the assembly part A1 is screwed into a screw hole Kb formed in a side wall surface Ka of a screwed portion K such as an engine case, the side wall surface Ka and the head 11 of the bolt 10 are connected. The washer 20 is sandwiched between and pressed against each other.

The assembly part A1 is plastically deformed so as to reduce the diameter of the loose insertion hole 21 by applying an external force parallel to the central axis O1 of the bolt 10 only to the peripheral edge of the loose insertion hole 21 of the washer 20 ′. Therefore, the outer peripheral surface of the shaft portion 13 and the inner peripheral wall surface 21a of the loose insertion hole 21 are in close contact with each other.
Thereby, the center axis of the bolt 10 and the center axis of the washer 20 are not shifted from each other, and the so-called roundness of the washer 20 is not lowered.
Therefore, as shown in FIG. 6, even when the bolt 10 is screwed in the horizontal direction, the center axis of the bolt 10 and the center axis of the washer 20 can be prevented from shifting from each other.

That is, between the bolt 10 and the washer 20, between the washer 20 and the screwed portion K, or between the shaft portion 13 of the bolt 10 and the loose insertion hole 21 of the washer 20, etc. It is possible to prevent or reduce the leakage of liquid such as oil.

Further, some of the bolts used for the screwed portion K that is required to have liquid tightness have a seat surface of the head inclined from the central axis toward the outer peripheral portion. Even in the case of a bolt having a surface, the seat surface and the washer 20 can be brought into close contact with a circle having a required width centered on the central axis O1. This also improves liquid tightness.

Further, since only the peripheral edge portion of the loose insertion hole 21 is deformed, the entire washer 20 is not deformed or distorted, so that the flatness on the outer peripheral side of the thin portion 22 can be maintained.
Further, since the washer 20 is formed of a material softer than the bolt 10, it can be easily molded and, when screwed into the threaded portion K, the head 11 of the bolt 10 and By the tightening force acting on the threaded portion K, the washer 20 can be plastically deformed to improve the adhesion.

Next, the assembly part A2 according to the second embodiment will be described with reference to FIG. FIG. 7 is a front view showing a part of the assembly part A2 according to the second embodiment in cross section. In addition, about the thing equivalent to what was demonstrated in embodiment mentioned above, the code | symbol same as them is attached | subjected and detailed description is abbreviate | omitted.

The assembly part A2 according to the second embodiment is an assembly of the coupling member 60 and the interposition member 20.
The coupling member 60 is formed by forming a head 61 formed in a circular flat plate shape at one end of a cylindrical shaft portion 62 having a constant outer diameter over the entire length. A groove 63 for fitting 20 is formed over the entire circumference.

In this configuration, since the inner peripheral edge portion of the loose insertion hole 21 with the reduced diameter of the interposition member 20 can be fitted into the groove 63, the interposition member 20 is attached to the shaft portion 62 where the screw is not formed. Even when assembled, the interposition member 20 can be prevented from being displaced along the shaft portion 62.
The groove 63 may be appropriately formed as necessary.

The present invention is not limited to the above-described embodiments, and the following modifications can be made.
As described above in detail, in any case, each configuration described in each of the above embodiments is not limited to being applied only to each of the above embodiments, but the configuration described in one embodiment is replaced by another embodiment. It can be applied mutatis mutandis or applied to it, and it can be arbitrarily combined.

In the above-described embodiment, the assembly process of the washer 20 ′ and the bolt 10, the diameter reducing process (caulking process) by the forming apparatus B, and the process of taking out the assembly part A 1 subjected to the diameter reducing process have been described as being automated. However, these steps may be performed manually.

FIG. 8 is a cross-sectional view of a part of the assembly part A1 in which the washer 20 is assembled to the sealing bolt 10 of М10. FIG. 8A shows a state before the diameter reduction process (caulking process). ) Is a front view showing a state after performing diameter reduction processing (caulking processing). Similarly, FIG. 9 shows a part of the assembly part A3 in which the washer 80 is assembled to the sealing bolt 70 of М24 in cross section, and (A) is before the diameter reduction process (caulking process) is performed. The state, (B), is a front view showing a state after performing diameter reduction processing (caulking processing).
The

washers

20 and 80 shown in FIGS. 8 and 9 are both aluminum and have a thickness t of 2 (mm).

The sealing bolt 10 of М10 shown in FIG. 8 has a shaft portion 71 having a neck diameter of 9.30 (mm), and the inner diameter D2 of the washer 20 ′ before the diameter reduction processing (caulking processing) is performed. The inner diameter D2 after φ10.7 and diameter reduction processing (caulking) is φ9.4.
The deformation rate in the radial direction of the washer 20 is 1.3 (mm), which is 12.1 (%).

The sealing bolt 70 of М24 shown in FIG. 9 has a shaft portion 71 having a neck diameter of 23.1 (mm), and the inner diameter D2 of the washer 80 ′ before the diameter reduction processing (caulking processing) is performed. The inner diameter D2 after φ24.3 and diameter reduction processing (caulking) is φ23.4.
The deformation rate in the radial direction of the washer 80 is 1.3 (mm) and is 3.7 (%).
As a result of the above diameter reduction processing, it was confirmed that any of the assembled parts A1, A3 has the desired liquid tightness.

The present invention relates to an assembly part in which a coupling member such as a bolt, a sealing bolt, a screw plug, an oil filter bolt or an oil bolt used in an engine or the like, and an interposed member such as a washer, and the assembly thereof It is about the method.

Claims

A coupling member having a head portion formed at one end of the shaft portion, an interposition member formed with a loose insertion hole having an inner diameter larger than the outer diameter of the shaft portion and made of a softer material than the coupling member; Is an assembly part that is assembled by inserting the shaft portion of the coupling member into the loose insertion hole of the interposed member,
The interposition member is an assembly component in which an external force parallel to the central axis of the shaft portion is applied to the peripheral portion of the loose insertion hole, and only the peripheral portion is plastically deformed to reduce the diameter. .
2. The assembly part according to claim 1, wherein only one of the surfaces of the interposed member is deformed at a peripheral portion of the loose insertion hole.
The assembly part according to claim 1 or 2, wherein an annular thin portion along the peripheral edge portion is continuously formed on the peripheral edge portion of the loose insertion hole.
The assembly part according to any one of claims 1 to 3, wherein the inner peripheral wall surface of the loose insertion hole is reduced in diameter so as to contact the outer peripheral surface of the shaft portion.
The fitting groove for fitting the loose insertion hole of the interposed member is formed below the neck of the shaft portion of the coupling member. Assembly parts.
The assembly part according to any one of claims 1 to 5, wherein a screw is threaded on a shaft portion of the coupling member.
A method for assembling an assembly part according to any one of claims 1 to 6,
In the shaft portion of the coupling member, the loose insertion hole of the intervention member is inserted,
After placing the assembly part on a die that protrudes in a cylindrical shape with a contact portion that contacts only the peripheral edge of the loose insertion hole of the intervention member,
Applying an external force parallel to the central axis of the shaft portion to the peripheral portion of the loose insertion hole on the interposed member sandwiched between the seating surface of the head of the coupling member and the contact portion of the die, A method of assembling an assembly part, wherein only the peripheral part is plastically deformed to reduce the diameter.