JP3470045B2 - Press fitting for elastic ring - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting tool for an elastic ring used for press-fitting an elastic ring such as a vibration-proof rubber ring interposed in a bolt connecting portion into a mounting hole of an object to be mounted.

[0002]

2. Description of the Related Art Generally, when various devices are mounted on a site where vibration is generated, or when a device which generates vibration is mounted on a substrate, noise associated with the vibration is prevented, and the device is liable to be modulated or broken due to the vibration. In order to prevent looseness or damage of the connection portion, a rubber vibration isolator is often interposed at the mounting site. For example, when installing an inlet manifold, an air cleaner, a radiator, a battery, various liquid tanks, etc. by bolt connection in the engine room of an automobile, the vibration isolator has a short tubular shape with an annular fitting groove at the center position of the outer circumference. A lot of rubber rings are used.

This anti-vibration rubber ring is forcibly press-fitted into a mounting hole of an object to be mounted so that an annular fitting groove is fitted in the mounting hole, and at the same time, large-diameter flange-shaped portions are formed. Is locked to both outer sides of the mounting hole, and is connected to the mating mounting portion via a bolt that passes through the hole of the rubber ring.

However, in the prior art, since there is no dedicated tool for press-fitting such a vibration-proof rubber ring,
Since the operator directly pushes the rubber ring into the hole for attachment of the object to be attached with his / her finger, or uses an appropriate tool at hand to assist it,
The press-fitting operation is very time-consuming and inefficient, and the rubber ring is in an incomplete mating state, which may cause the rubber ring to fall off before it is used in the next bolt connecting process, or force correction work when connecting the bolts. There were many.

In view of the above circumstances, the present invention facilitates the press-fitting operation when the elastic ring including the above-mentioned vibration-proof rubber ring is press-fitted into the mounting hole of the object to be mounted. It is intended to provide a press-fitting tool for performing efficiently and reliably.

[0006]

In order to achieve the above object, the elastic ring press-fitting device according to claim 1 of the present invention has an annular fitting groove 31 on the outer periphery, as indicated by the reference numerals in the drawings. A short cylindrical elastic ring 3 having a mounting hole 4 for mounting an object 4
A press-fitting tool T to be press-fitted into a, comprising a holding cylinder 1 into which an elastic ring 3 is loaded, and a pressing rod 2 having a press-fitting shaft portion 2a whose one end side is inserted into the holding cylinder 1. At the tip of the press-fitting shaft portion 2a of the pressing rod 2, the hole portion 3 of the elastic ring 3 is formed.
A short shaft-shaped projection 23 that projects into 0 is provided concentrically, and the periphery of the proximal end of the short shaft-shaped projection 23 is the end surface 3a of the elastic ring 3.
An annular step portion 24 to be brought into contact with the elastic ring 3
With Gow attach one end 1a side of the loaded holding cylinder 1 in the heart shape in the mounting holes 4a position of the object to be attached object 4, press-fitting axis of the pressing rod 2 from the other end 1b side in the holding cylinder 1 By inserting and pressing the portion 2a, the elastic ring 3 is forcibly pushed out and press-fitted into the mounting hole 4a.

According to the press-fitting tool T having the above structure, the object to be mounted 4
When the elastic ring 3 is press-fitted into the mounting hole 4a, the elastic ring 3 is loaded into the holding cylinder 1, and the holding cylinder 1 is held by one hand so that the one end 1a side is substantially at the mounting hole 4a position. When the press-fitting shaft portion 2a of the pressing rod 2 held concentrically with the other hand is inserted into the holding cylinder 1 from the other end 1b side and pressed, the elastic ring 3 is forced from the holding cylinder 1. Is pushed out, and the large-diameter collar-shaped portion 32a on the front side thereof passes through the mounting hole 4a in a compressed and deformed state and is restored to the original shape on the outside of the mounting hole 4a. To fit. At this time, since the short-axis projection 23 of the pressing rod 2 is disposed in the hole 30 of the elastic ring 3, the collar-shaped portion 32a of the elastic ring 3 is in a distorted deformed state when returning from the compressed state. As a result, the annular fitting groove 31 is surely fitted into the mounting hole 4a.

Further, according to the present invention, the pressing rod 2 has a stopper portion 25 which determines the insertion limit of the press-fitting shaft portion 2a by abutting against the other end of the holding cylinder 1. Therefore, if the position of the insertion limit of the press-fitting shaft portion 2a by the stopper portion 25 is properly set, the one end 1a side of the holding cylinder 1 loaded with the elastic ring 3 is set to the mounting hole 4a position of the mounted object 4. When pressing and pressing the pressing rod 2 inserted in the holding cylinder 1,
Since the tip of the press-fitting shaft portion 2a is stopped by the stopper portion 25 at a predetermined insertion depth, the elastic ring 3 is excessively pushed into the mounting hole 4a up to the rear flange portion 32b or the mounting hole 4a. The elastic ring 3 is surely brought into a proper fitting state without passing through and falling off.

[0009] The second aspect of the present invention is the elastic ring for press-fitting tool T of the claims 1, holding cylinder 1, one end 1a side has a diameter and equal Shii diameter of the mounting hole 4a of the object to be attached object 4 The diameter of the other end 1b side is set to be larger than that of the one end 1a side, and the central hole 10 has a tapered hole portion 10a whose diameter decreases toward the one end 1a side. In this case, the elastic ring 3 is fitted into the center hole 10 from the other end 1b side of the holding cylinder 1 having a large diameter, and the press-fitting shaft portion 2 of the pressing rod 2 is also fitted into the center hole 10 from the other end 1b side.
When a is inserted and pushed in, the taper hole portion 10 of the central hole 10 in the state where the short-axis projection 23 is projected into the hole portion 30.
One end 1 which is an outlet while being gradually compressed as the diameter of a decreases.
Since it moves to the a side, and the entire outer circumference is in a compression deformation state in which the diameter of the mounting hole 4a is approximately equal to the one end 1a side,
The collar-shaped portion 32 on the front side when pushed out from the holding cylinder 1.
a does not get caught at the opening edge of the mounting hole 4a, and smoothly passes through the mounting hole 4a.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A press-fitting tool for an elastic ring according to an embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a holding cylinder 1 and a pressing rod 2 made of a metal such as aluminum and a rubber elastic ring 3 which constitute the press-fitting tool T. Thus, the elastic ring 3 has a substantially short tubular shape, and has the annular fitting groove 31 at the center position of the outer circumference, thereby forming the flange-shaped portions 32a and 32b having large diameters on both sides.

The holding cylinder 1 has a substantially cylindrical shape in which the outer diameter is sequentially increased in four steps from the one end 1a side to the other end 1b side, and has a circular central hole 10 penetrating in the axial direction. Then, as shown in FIG. 2, the center hole 10 of the holding cylinder 1 is
It is composed of a tapered hole portion 10a whose diameter decreases from the middle portion toward the one end 1a side, and a straight hole portion 10b which extends from the inner end of the maximum inner diameter of the tapered hole portion 10a to the other end 1b side. An annular tapered surface 11 is provided at the opening edge. It should be noted that the diameter of the center hole 10 on the side of the one end 1a ( taper
The minimum inner diameter of the hole 10a is set to be substantially equal to the diameter of the mounting hole 4a (see FIG. 3) of the mounted object 4 described later, and the bore on the other end 1b side (the inner diameter of the straight hole 10b = taper) The maximum inner diameter of the hole 10a) is set to be equal to or slightly smaller than the outer diameter of the elastic ring 3.

The pressing rod 2 has a press-fitting shaft portion 2a on one end side,
It is a substantially round bar shape in which the gripping shaft portion 2b on the other end side, which is larger in diameter and longer than this, is coaxially connected, and a round short shaft-shaped projection 23 is concentrically provided at the tip of the press-fitting shaft portion 2a. The periphery of the base of the short-axis projection 23 forms an annular step portion 24, and both shaft portions 2
A stopper portion 25 composed of an annular tapered surface is formed at the boundary between a and 2b. Then, the press-fitting shaft portion 2a is
The other end 1 of the central hole 10 in the holding cylinder 1 is closer to the base side than the middle
A large-diameter portion 21 having an outer diameter slightly smaller than the bore on the b side and a small-diameter portion 22 having an outer diameter slightly smaller than the bore on the one end 1a side of the center hole 10 on the tip side are provided. Edge 1b
At the insertion limit where the stopper portion 25 comes into contact with the annular tapered surface 11 of the holding cylinder 1 when inserted from the side, the annular step portion 24 extends from the one end 1b of the holding cylinder 1 to the flange portion 32a of the elastic ring 3. The length is set so as to be positioned inside by a width corresponding to or slightly shorter than the width. In addition, the short-axis protrusion 23 has an outer diameter of the hole 30 of the elastic ring 3.
Is smaller than the inner diameter of the elastic ring 3 and the length thereof is set shorter than the axial length of the elastic ring 3.

Next, the press-fitting operation of the elastic ring 3 by the press-fitting tool T having the above construction will be described with the aluminum die-cast tank shown in FIG. The attached object 4 has a plurality of mounting projections 41 provided with circular mounting holes 4a at a plurality of positions on the periphery of the tank body 40. Then, each of the mounting projections 41 has circular recesses 41a, 41a formed concentrically with the mounting holes 4a on the outer surfaces on both sides, and
As shown in FIG. 3, both sides are thickened by reinforcing ribs 41b and 41c. The elastic ring 3 to be used
The outer diameter and width of the annular fitting groove 31 correspond to the inner diameter of the mounting hole 4a and the wall thickness of the mounting hole 4a.

In order to fit the elastic ring 3 into each mounting hole 4a of the object 4 to be mounted, first of all, as shown in FIG. Edge 1
It is loaded from the b side, and similarly, the press-fitting shaft portion 2a of the pressing rod 2 is inserted from the other end 1b side, and the short shaft-shaped projection 23 is inserted into the hole portion 30 of the elastic ring 3. Then, as shown in FIG. 3A, the holding cylinder 1 is held by one hand, the one end 1a side is applied to the position of the mounting hole 4a in a substantially concentric manner, and the pressing rod 2 held by the other hand is held. As you push in, the elastic ring 3
Is pushed by the annular step portion 24 of the pressing rod 2 and moves to the end 1a side in the center hole 10, but is gradually compressed as the inner diameter is reduced in the process of passing through the tapered hole portion 10a, and the holding cylinder 1 In the vicinity of one end 1a side, the entire outer periphery is in a compression deformation state substantially equal to the diameter of the mounting hole 4a as shown in the figure. When the pressing rod 2 is further pushed in this state, the elastic ring 3 is forcibly pushed out of the holding cylinder 1 as shown in FIG.
The large-diameter collar-shaped portion 32a on the front side thereof passes through the mounting hole 4a in a compressed and deformed state, and is restored to the original shape on the outside where the ring-shaped fitting groove 31 fits into the mounting hole 4a.

At this time, the elastic ring 3 is in a compression deformed state in which the entire outer periphery is approximately equal to the diameter of the mounting hole 4a in the vicinity of the one end 1a side of the holding cylinder 1, and when pushed out from the holding cylinder 1, Since the collar-shaped portion 32a on the side of the portion smoothly passes through the mounting hole 4a without being caught at the opening edge of the mounting hole 4a, damage such as cracks does not occur, and the short-axis projection of the pressing rod 2 does not occur. By arranging 23 projectingly into the hole 30 of the elastic ring 3, the collar-shaped portion 3 of the elastic ring 3 is formed.
When 2a returns from the compressed state, it does not become a distorted deformed state, so that the annular fitting groove 31 surely fits into the mounting hole 4a. When the annular fitting groove 31 is fitted in this way, the stopper portion 25 of the pressing rod 2 and the annular tapered surface 11 of the holding cylinder 1 come into contact with each other, thereby preventing further insertion of the short shaft-like projection 23. Therefore, the press-fitting operation described above is performed by the pressing rod 2.
Just push it to the limit. Then, if the entire press-fitting tool T is pulled away, the elastic ring 3 will have the collar-shaped portions 32 on both sides.
The a and 32b are arranged properly on both outer sides of the mounting projection 41.

It should be noted that the press-fitting shaft portion 2a of the pressing rod 2 is previously inserted into the holding cylinder 1 before the elastic ring 3 is loaded, and the holding cylinder 1 loaded with the elastic ring 3 is mounted in this inserted state. The above-described press-fitting operation may be performed by applying it to the position of the hole 4a.

Thus, the mounting hole 4a of each mounting projection 41 is formed.
The attached object 4 in which the elastic ring 3 is fitted can be directly attached to a base body such as a car body of an automobile. However, in order to prevent abrasion of the elastic ring 3 and maintain its shape, in general,
As shown in FIG. 5 , metal collars 5 and 5 including a tubular portion 5a and a collar portion 5b are fitted to the elastic ring 3 from both sides. Then, as shown in FIG. 6 , the connecting bolt 8 is passed through the hole 30 in which the collars 5 and 5 are interposed and the bolt insertion hole 7a of the mounting portion 7 on the base 6 side, and the nut 9 is screwed and tightened. As a result, the object to be attached 4 is attached to the base 6.
In such a mounting structure, the object to be mounted 4 is held on the base 6 by the elastic ring 3 interposed in the joint portion without direct metal contact, so that the base 4 can be mounted on a base such as an automobile. Even if the 6 side vibrates violently,
As a result of the vibration being absorbed by the elastic ring 3, it is possible to prevent noise associated with the vibration, modulation or failure due to the vibration of the mounted object 4 side, loosening or damage of the connection portion, and the like.

In the above embodiment, an aluminum die-cast tank was used as the object 4 to be attached, but the elastic ring press-fitting tool T of the present invention can be used, for example, in an engine room of an automobile such as an inlet manifold, an air cleaner, a radiator and a battery. , An elastic ring to be interposed in the mounting holes 4a of various objects 4 to be bolt-attached, including a vibration-proof rubber ring to be placed in the bolt connecting portion when attaching various liquid tanks made of metal or synthetic resin It can be suitably used for the press-fitting work of No. 3. Thus, in the press-fitting tool T of the present invention, the outer shapes of the holding cylinder 1 and the pressing rod 2 can be set to various shapes other than the exemplified shape, and for example, the press-fitting shaft portion 2a of the pressing rod 2 has a small diameter of the embodiment. Holding cylinder 1 instead of the part 22
The tapered hole corresponding to the tapered hole portion 10a in the central hole 10, or the entire length of the central hole 10 is a tapered hole, and the press-fitting shaft portion 2a of the pressing rod 2 has a tapered shape corresponding to the entire length. It is also possible to make the entire length of the central hole 10 straight and to load the elastic ring 3 in a compressed state.

[0019]

According to the elastic ring press-fitting tool of the present invention, when the elastic ring such as the vibration-proof rubber ring interposed in the bolt connecting portion is press-fitted into the mounting hole of the object to be mounted, the elastic ring is internally elasticized. The elastic ring is efficiently and reliably secured by placing one end of a holding cylinder loaded with a ring at the position of the mounting hole and pressing a pressing rod inserted into the holding cylinder from the other end to perform an extremely simple operation. Can be press-fitted into the mounting hole.

Further, according to the present invention, the pressing rod is the holding cylinder .
Since it has a stopper part that determines the insertion limit of the press-fitting shaft part by contact with the other end , it is possible to prevent the elastic ring from being excessively pushed in, so that the elastic ring can be more reliably and properly fitted. There is an advantage that can be.

As such an elastic ring press-fitting tool, in particular, as in the second aspect of the invention, one end side of the holding cylinder has a diameter substantially equal to the diameter of the attachment hole of the attachment object and the other end side. If the diameter of the elastic ring is increased and the central hole is provided with a tapered hole portion that reduces its diameter toward the one end side, it becomes easy to load the elastic ring into the holding cylinder, and at the same time, the elastic ring is pressed through the elastic rod. When the ring is pushed into the vicinity of one end side of the holding cylinder, the entire outer circumference is in a compression deformation state approximately equal to the diameter of the mounting hole, and when this elastic ring is forcibly pushed out of the holding cylinder, the collar part on the front side is formed. Since it smoothly passes through the mounting hole without getting caught, there is an advantage that damage such as cracks can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a press-fitting tool for an elastic ring and an elastic ring according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which an elastic ring is loaded in the elastic ring press-fitting tool.

FIG. 3 is a view showing a press-fitting operation of an elastic ring into a mounting hole of an object to be mounted by the press-fitting tool for the elastic ring,
(A) is a vertical sectional side view showing a state before press-fitting, and (b) is a vertical sectional side view showing a state after press-fitting.

FIG. 4 is a plan view showing a main part of an attachment object in which the elastic ring is fitted in an attachment hole.

FIG. 5 is a vertical cross-sectional front view of essential parts showing a state in which a collar is fitted to the elastic ring fitted to a mounting hole of an object to be mounted.

FIG. 6 is a vertical cross-sectional side view of essential parts showing a state in which an attachment object in which the elastic ring is fitted in an attachment hole is attached to a base body.

[Explanation of symbols]

Press-fitting tool for T elastic ring 1 holding cylinder 1a One end 1b other end 10 central hole 10a Taper hole 11 Annular taper surface 2 pressing rod 2a Press-fitting shaft 23 Short-axis projection 24 annular step 25 Stopper part 3 elastic ring 3a end face 30 holes 31 annular fitting groove 32a collar part 32b collar part 4 Attached object 4a Mounting hole 41 Mounting protrusion 5 colors 6 base 7 Mounting piece 8 volt 9 nuts

Claims (2)

(57) [Claims] 1. A press-fitting tool for press-fitting and fitting a short tubular elastic ring having an annular fitting groove on the outer periphery into a mounting hole of an object to be mounted, a holding cylinder into which the elastic ring is loaded, and one end. A press rod having a press-fitting shaft portion whose side is inserted into the holding cylinder, and a short shaft-like projection for projecting into the hole of the elastic ring is concentrically provided at the tip of the press-fitting shaft portion of the press rod. , The circumference of the proximal end of the short-axis projection forms an annular step portion that abuts the end surface of the elastic ring, and the pressing rod determines the insertion limit of the press-fitting shaft portion by abutting on the other end of the holding cylinder. One end side of a holding cylinder equipped with a stopper and having an elastic ring inside is concentrically applied to the mounting hole position of the attached object, and the pressing rod is pressed into the holding cylinder from the other end side. By inserting the shaft part and pressing it until the stopper part of the pressing rod contacts the other end of the holding cylinder. The elastic ring press-fitting tool is configured so that the elastic ring is forcibly pushed out and press-fitted into the mounting hole. 2. The holding cylinder has a diameter on one end side equal to the diameter of the mounting hole of the mounted object, and a diameter on the other end side is set larger than this one end side, and the holding hole is set to the center hole toward the one end side. 2. A taper hole portion having a diameter that decreases toward the front side.
The press-fitting tool for the elastic ring described.