JP3899467B2 - Press-fit spacer and its mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press-fit spacer used when attaching various parts to a base such as a chassis, and an attachment structure thereof .
[0002]
[Prior art]
A base such as a chassis made of steel or aluminum is provided in a housing of an electronic device or the like, and various parts are attached to the base via a spacer. As such a spacer, a press-fit type spacer is known, which includes an elongated main body portion, a constricted portion provided at one end of the main body portion, and a fitting portion extending in the axial direction from the constricted portion. Normally, the main body, constricted part, fitting part, etc. are integrally formed of a metal material that is harder than the target base, and the fitting part is press-fitted into the mounting hole provided in the base using a hydraulic press etc. By doing so, the press-fit type spacer is fixed to the substrate. And various parts etc. are attached to a board | substrate by inserting a fixing bolt in the through-hole provided in various parts etc., and screwing the fixing bolt in the screw hole provided in the main-body part.
[0003]
[Problems to be solved by the invention]
However, when the thickness of the base using the press-fit spacer is thin, for example, when a force in the surface direction acts on various parts, the base around the press-fit fitting part is deformed and the press-fit spacer is inclined. There is a problem that deformation strain occurs in the base.
Accordingly, an object of the present invention is to provide an improved press-fit spacer that can solve such problems.
[0004]
[Means for Solving the Problems]
The invention described in claim 1 of the present invention that solves the above-described problems includes an elongated main body portion (2), a constricted portion (3) provided at the tip of the main body portion (2), and the constricted portion (3 In the press-fit type spacer provided with a fitting portion (4) extending from the axial direction to the tip end in the axial direction , and press-fitting the fitting portion (4) into the mounting hole (21) provided in the base (20) .
The main body (2 ) is provided with an enlarged portion (5) whose outer diameter is integrally enlarged from a portion adjacent to the constricted portion (3) to the rear in the axial direction by a predetermined length ,
The enlarged portion (5) has a diameter larger than that of the main body (2) ,
A press-fit spacer characterized in that a cylindrical enlarged body (6) (10) is press-fitted and fixed to the outer periphery of the enlarged portion (5) .
According to a second aspect of the invention, in the invention described in claim 1, the outer threaded portion (9) is provided in the enlarged portion (5), an extension field to the external thread portion (9) (10) A press-fit spacer that is screwed .
According to a third aspect of the invention, using a press-type spacer according to claim 1 or claim 2,
The fitting portion (4) is press-fitted and fixed to the mounting hole (21) provided in the base (20) from one plane side thereof, and the enlarged portion (5) from the other plane side of the base (20 ). The enlarged body (6) (10) is inserted and fixed to the base plate (20) from both sides thereof, and is a press-fit spacer mounting structure.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial sectional view showing a state in which an example of a press-fit spacer of the present invention is used and fixed to a base, and FIG. 2 is an exploded perspective view of the press-fit spacer portion.
In these figures, a press-fit spacer 1 is an elongated cylindrical main body 2 formed integrally, an annular constriction 3 provided at one end of the main body 2, and an axially extending projection from the constriction 3. The fitting part 4 of the protruding item | line to be provided is provided. Further, an enlarged portion 5 whose outer diameter is slightly enlarged from the portion adjacent to the constricted portion 3 in the main body portion 2 in the axial direction is integrally formed, and a cylindrical enlarged body 6 is formed on the outer periphery of the enlarged portion 5. It is fixed by press-fitting. This fixing may be screw connection, welding, adhesion, or the like in addition to press-fitting.
Therefore, in this example, the required outer diameter is obtained by both the enlarged portion 5 and the enlarged body 6. The outer diameter of the enlarged portion 5 is preferably about 0.5 to 2 mm larger than the diameter of the main body 2, and the dimension of the predetermined length in the axial direction is preferably about 1 to 3 times the diameter of the main body 2. (In addition, FIG. 2 is a state before the expansion body 6 is press-fitted in the expansion part 5.)
[0006]
The press-fit spacer 1, particularly the fitting portion 4 thereof, is made of a material having a hardness higher than that of the base 20, for example, a material such as carbon steel or stainless steel, in order to ensure press-fit.
The outer peripheral surface of the fitting part 4 is knurled so that the press-fit spacer 1 in a state of being press-fitted into the base 20 is prevented from rotating with respect to the base 20. Further, on the inner peripheral surfaces of the main body 2, the constricted part 3 and the fitting part 4, an internal thread part 7 which is continuous in the axial direction is formed so that various parts (not shown) can be bolted together.
In addition, this internal thread part 7 can also be provided only from the top part of the main-body part 2 to the middle. Furthermore, an external screw may be formed instead of the internal screw.
[0007]
Next, a method for fixing the press-fit spacer 1 to the base 20 will be described with reference to FIGS. 1 and 2.
First, as a first method, the enlarged body 6 is press-fitted and fixed to the enlarged portion 5 in the main body 2 using a hydraulic press or the like from the state of FIG. 2, and then the fitting portion 4 of the press-fit spacer 1 is fixed. Using a hydraulic press or the like, the mounting hole 21 provided in the base 20 is press-fitted relatively slowly from the upper surface side and fixed. The inner diameter of the mounting hole 21 is slightly smaller than the outer diameter of the fitting portion 4, and the fitting portion 4 is press-fitted while expanding the mounting hole 21. As shown in FIG. 1, the peripheral portion of the mounting hole 21 after the fitting portion 4 has been press-fitted is contracted by the restoring force and engaged with the constricted portion 3, so that the press-fit spacer 1 falls off from the base 20. To prevent.
When a force perpendicular to the axis is applied to the press-fit spacer 1 fixed to the base 20 in this way, the force acts to rotate the main body 2, but the enlarged portion 5 and the enlarged body 6. Thus, the rotational force is received by the portion whose outer diameter is enlarged, particularly the portion where the bottom area is increased, and it is avoided that the force is concentrated on the peripheral portion of the mounting hole 21 of the base 20. For this reason, no deformation or the like occurs in the peripheral edge portion, and there is no possibility that the press-fit spacer is inclined.
[0008]
Next, as a second method, the fitting portion 4 of the press-fit type spacer 1 is pressed into the mounting hole 21 provided in the base 20 from the lower surface side relatively slowly from the state shown in FIG. And fix. The inner diameter of the mounting hole 21 is slightly smaller than the outer diameter of the enlarged portion 5 and the fitting portion 4, and the enlarged portion 5 is press-fitted while expanding the mounting hole 21. As shown in FIG. 1, the peripheral portion of the mounting hole 21 after the enlarged portion 5 has been press-fitted is contracted by the restoring force and engaged with the constricted portion 3 to prevent the press-fit spacer 1 from falling off the base 20. To do. Next, while supporting the lower surface side of the base 20 and the fitting portion 4 with the upper surface of a support body (not shown), the expansion body 6 is press-fitted and fixed to the expansion portion 5 in the main body portion 2 from above using a hydraulic press or the like. .
Instead of press-fitting the expansion body 6, the expansion body 10 may be screwed and fastened to the expansion portion 5 as in the structure of FIG. 4 described later.
[0009]
FIG. 3 is a partial cross-sectional view showing a state in which another example of the press-fit spacer 1 of the present invention is used and fixed to a base.
In this example, an enlarged portion 8 is integrally provided for enlarging the outer diameter from the portion adjacent to the constricted portion 3 in the main body portion 2 in the axial direction, and the operation is the same as the example of FIG. is there.
FIG. 4 is a partial cross-sectional view showing a state in which still another example of the press-fit spacer 1 of the present invention is used and fixed to a base.
In this example, in the cylindrical main body portion 2 having the same outer diameter over the entire length, in order to enlarge the outer diameter of a predetermined length from the portion adjacent to the constricted portion 3 provided at the end portion to the axial direction. An outer screw portion 9 is formed on the outer peripheral surface of the predetermined length portion of the main body portion 2, and a cylindrical expansion body 10 having an outer diameter larger than that of the main body portion 2 and provided with an inner screw is provided on the outer screw portion 9 Are combined. The operation of this example is the same as that of the example of FIG.
In addition to the screw connection, the enlarged body 10 can be connected to the main body 2 by welding, adhesion, or press fitting.
[0010]
【The invention's effect】
As described above, the press-fit spacer of the present invention has an outer diameter that is enlarged from the portion adjacent to the constricted portion in the main body portion to the rear in the axial direction by a predetermined length , and the cylindrical expansion body 6 is formed on the outer periphery of the enlarged portion 5. Since 10 is press-fitted and fixed , when a lateral force is applied to the object supported by the press-fit spacer, the rotational force of the press-fit spacer is caused by the enlarged portion 5 and the enlarged bodies 6 and 10 . part, particularly the bottom area is received increases can be avoided that the force is concentrated on the mounting hole periphery of the base. Therefore, no deformation or the like occurs in the peripheral edge portion, and there is no possibility that the press-fit spacer is inclined.
The press-fit spacer mounting structure of the present invention uses the press-fit spacer,
The mounting hole 21 provided in the base 20, while the fitting part 4 from the flat surface side of the press-fitted, by inserting fixing the expansion body 6, 10 from the other plane side of the substrate 20 in the enlarged portion 5, Since the base 20 is fixed by crimping from both sides, the base 20 is sandwiched from both sides, and a strong spacer structure is obtained that is difficult to move in any axial direction .
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a state where an example of a press-fit spacer of the present invention is used and fixed to a base.
2 is an exploded perspective view of a press-fit spacer portion in FIG. 1. FIG.
FIG. 3 is a partial cross-sectional view showing a state in which another example of the press-fit spacer of the present invention is used and fixed to a base.
FIG. 4 is a partial cross-sectional view showing a state in which still another example of the press-fit spacer of the present invention is used and fixed to a base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press-fit type spacer 2 Main body part 3 Constricted part 4 Fitting part 5 Enlarged part 6 Enlarged body 7 Internal threaded part 8 Enlarged part 9 External threaded part 10 Enlarged body 20 Base 21 Mounting hole

Claims (3)

An elongated body part (2), a constricted part (3) provided at the distal end part of the main body part (2), and a fitting part (4) extending from the constricted part (3) to the distal end side in the axial direction. In the press-fit type spacer in which the fitting portion (4) is press-fitted into the mounting hole (21) provided in the base (20),
The main body (2 ) is provided with an enlarged portion (5) whose outer diameter is integrally enlarged from a portion adjacent to the constricted portion (3) to the rear in the axial direction by a predetermined length ,
The enlarged portion (5) has a diameter larger than that of the main body (2) ,
A press-fit type spacer in which a cylindrical enlarged body (6) (10) is press-fitted and fixed to the outer periphery of the enlarged portion (5) . In claim 1 ,
The external thread portion (9) is provided in the enlarged portion (5), press-type spacer extension field (10) it is screwed to the external thread portion (9). Claim  1 Alternatively, using the press-fit spacer according to claim 2,
Foundation (20) Mounting holes provided in (twenty one) In addition, the fitting portion from the one plane side (Four) Is press-fitted and fixed to the base (20) The enlarged portion from the other plane side of the (Five) To the enlarged body (6) (10) Is inserted fixed, the base (20) A press-fit type spacer mounting structure that has been fixed by crimping from both sides.

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