JPH10211657A - Squeezing apparatus for vibration-proof rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vibration-proof rubber squeezing apparatus simple in structure, high in general-purpose properties and excellent in durability. SOLUTION: A squeezing apparatus is equipped with a die 24 having a passage 22 into which vibration-proof rubber is inserted, a long cylindrical press head part 26 and a holder 30 having a recessed part 28 for receiving the anti- insertion side end part 26b of the press head part 26. The press head part 26 is constituted of press pieces 26A divided into four parts in a peripheral direction and the anti-insertion side end part 26b of the respective press pieces 26 is attached to the inside of the recessed part 28 through bolt screws 32 in a shakable manner. The anti-insertion side end part 26b of the press pieces 26A is energized to the inner peripheral wall surface 28b of the recessed part 28 by coil springs 34. The insertion end parts 26b of the respective press pieces 26A presses the outer cylinder 14 of vibration-proof rubber 10 to pass through the passage 22 and, at this time, the insertion side end part 26a is shaken in the inner diameter direction centering the antiinsertion side end part 26b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber squeezing device for reducing the diameter of an outer cylinder of the anti-vibration rubber.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
FIG. 5 shows a diaphragm device for the vibration isolating rubber 1 described in Japanese Patent No. 49630. The vibration isolating rubber 1 is formed by vulcanizing and bonding a rubber elastic body 1c between the inner cylinder 1a and the outer cylinder 1b. Rubber 1
A die 3 having a passage 2 through which is inserted, a pressing member 4 divided into four parts in the circumferential direction and penetrating the passage 2 while pressing the outer cylinder 1 b of the vibration-proof rubber 1, and holding the pressing members 4 And a holder 5. A tapered portion 2a whose diameter gradually decreases toward the outlet is formed in the middle of the passage 2. The die 3 includes a plurality of dies 3a, 3b, and 3c, and the die 3b that forms the tapered portion 2a is formed from a cemented carbide.

The holder 5 has an adapter 5a attached to a shaft of a press machine or the like (not shown) and a mandrel 5b attached to the adapter 5a. A pressing piece 4 is attached around the mandrel 5b via a bolt screw 6. ing. A coil spring 7 is provided around the bolt screw 6 to urge the pressing piece 4 outward so as to form a gap with the mandrel 5b. Reference numeral 8 denotes a locate pin for guiding the radial movement of the pressing piece 4.

[0004] When performing drawing, the tip of the mandrel 5b is inserted into the inner cylinder 1a of the vibration isolating rubber 1 and the pressing piece 4
The end face 4a on the insertion side of the outer cylinder 1b is brought into contact with the end face of the outer cylinder 1b, and the vibration-proof rubber 1 is pressed into the outlet side of the passage 2. Then, the outer diameter of the outer cylinder 1 b is gradually reduced along the inner diameter of the passage 2 as the vibration-proof rubber 1 passes through the tapered portion 2 a of the passage 2.
The pressing piece 4 is compressed by the inner wall of the passage 2 to compress the coil spring 7 and move toward the mandrel 5b. Such an aperture device is excellent in that the pressing piece 4 can move in the inner diameter direction so as to follow the outer cylinder 1b, and thus the amount of aperture in one continuous aperture can be set large.

[0005]

Since a large pressure acts between the non-insertion side end face 4b of each pressing piece 4 and the insertion side end face of the adapter 5a, ie, the pressure receiving face 5c, which comes into pressure contact with the pressing piece 4, the anti-insertion side faces. When the side end face 4b moves in the radial direction, a large frictional resistance is generated. Here, in the above-described conventional diaphragm device, since the entire pressing piece 4 is configured to pass through the inside of the passage 2, the non-insertion side end face 4 b of the pressing piece 4 is formed in the radial direction by a length equal to the amount of diaphragm. Will be moved to. In other words, there is a problem in that the amount of movement in the radial direction on the non-insertion side end surface 4b is large, and wear is increased in this portion, thereby reducing the durability of the device.

Further, since the entire pressing piece 4 having a relatively short length in the axial direction passes through the inside of the passage 2, the end on the insertion side of the pressing piece 4 passes through, for example, the outlet side corner 2b of the tapered portion 2a. Immediately after the passage, the passage 2 may be separated from the inner wall surface, and the insertion-side end surface 4a may be detached from the end surface of the outer cylinder 1b.

Further, since the pressing piece 4 is configured to be held from the inside, the structure becomes complicated, and setting of the aperture amount according to the product is complicated. For example, in order to set the gap between the mandrel 5b and the pressing piece 4 corresponding to the amount of drawing to a predetermined width, the dimensions of the bolt screw 6, the mandrel 5b and the pressing piece 4, the mounting dimensions of the bolt screw 6, and the like must be adjusted. However, the setting work is complicated.

In the conventional apparatus, dimensions of the pressing piece 4, the die 3, the adapter 5a of the holder 5, the mandrel 5b, and the like are set in accordance with the outer diameter and the amount of drawing of the vibration isolating rubber for drawing. Therefore, it cannot be applied to anti-vibration rubbers having different outer diameters and squeezing amounts, and is not versatile. That is, since the aperture device becomes uniform at one point, the manufacturing cost increases.

[0009]

SUMMARY OF THE INVENTION Therefore, the invention of claim 1 has a passage through which a vibration-proof rubber is inserted, and in the middle of the passage, the outer cylinder of the vibration-proof rubber is reduced in diameter. A die having a tapered portion whose diameter gradually decreases toward the outlet side, a pressing head formed at least in a cylindrical shape longer than the passage, and pressing the outer cylinder into the passage; A holder having a concave portion that receives an end of the head portion on the side opposite to the insertion side, wherein the pressing head portion is configured by a plurality of pressing pieces that are divided in a circumferential direction and extend in the axial direction of the pressing head portion, Urging means for urging the opposite end of the pressing piece on the side opposite to the insertion side to the inner peripheral wall side of the concave portion so as to leave a predetermined gap between the adjacent pressing pieces; Is pressed against the inner wall of the passage so that it can move in the inner diameter direction. The non-insertion side end portion is characterized by comprising a holding means swingably held in the recess.

[0010] As an example, the holding means is a screw that extends radially through the holder and is screwed to the opposite end of the pressing piece on the non-insertion side. This is a coil spring that is compressed in between and biases the screw in the outer diameter direction.

Further, in the invention of claim 3, the outer diameter of the pressing head portion is set so as to abut the outer diameter of the outer cylinder at the end on the insertion side, and the inner diameter of the holder recess at the opposite end on the insertion side. And the throttle amount of the outer cylinder.

In the present invention, the outer cylinder of the vibration-proof rubber is pressed by the insertion-side end face of the pressing piece to press-fit the vibration-proof rubber into the passage. When the vibration isolating rubber passes through the tapered portion of the passage, the outer cylinder is pressed against the inner wall of the passage and gradually reduces its diameter. Also, when the insertion side end of each pressing piece passes through the tapered portion of the passage,
By being pressed against the inner wall of the passage, the arm swings in the inner diameter direction around the end opposite to the insertion side.

[0013]

According to the first aspect of the present invention, first, the end of the pressing piece opposite to the insertion side is urged toward the inner peripheral wall side of the concave portion, and the insertion side end of the pressing piece is set in the radial direction. Due to the swinging configuration, the amount of movement of the pressing piece in the radial direction is smaller than the amount of contraction at the non-insertion side end face of the pressing piece pressed against the concave portion of the holder, thereby reducing the amount of wear at the non-insertion side end face. be able to.
As a result, the durability of the device itself can be improved.

Secondly, since the pressing piece is formed to be at least longer than the passage and its insertion side end swings, when the insertion side end of the pressing piece swings in the inner diameter direction. The inclination of the pressing piece with respect to the axis can be reduced. As a result, the pressing piece always comes into contact with the inner peripheral wall of the passage near the insertion-side end, and the insertion-side end face of the pressing piece is prevented from coming off the end face of the outer cylinder.

Third, since there is no need for a structure such as a mandrel provided inside the pressing piece as in the above-described conventional example, the number of parts can be reduced as compared with the conventional example, and the structure can be simplified. Can be.

According to the third aspect of the present invention, the outer diameter of the pressing head portion at the end opposite to the insertion side is set to the difference between the inner diameter of the holder concave portion and the throttle amount of the outer cylinder. The amount of throttle can be easily set by the difference between the inner diameter of the holder recess and the outer diameter of the pressing head at the end opposite to the insertion side.

Further, in the drawing device of the present invention, for the vibration-proof rubber to be drawn, the passage of the die is formed in accordance with the outer diameter of the outer cylinder of the vibration-proof rubber and the amount of drawing. The diameter may be set at the insertion-side end so as to abut against the outer diameter of the outer cylinder, and at the non-insertion-side end, the difference may be set to the difference between the inner diameter of the holder recess and the throttle amount of the outer cylinder. In other words, since the dimensions and the like of the holding means such as the holder and the bolt screw and the urging means such as the coil spring do not depend on the outer diameter and the amount of contraction of the vibration isolating rubber, the vibration isolating rubbers having different outer diameters and amounts of contraction can be used. The device can be used as it is, and the versatility of the device itself is enhanced. In addition, since parts such as the holder can be shared, the manufacturing cost can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 3 show an embodiment of a diaphragm device for an anti-vibration rubber according to the present invention, that is, an aperture device for reducing the diameter of the outer cylinder 14 of the rubber isolator 10.

In this embodiment, a rubber elastic body 16 is used as a vibration-proof rubber 10 between an inner cylinder 12 and an outer cylinder 14 made of a metal and vulcanized and bonded to the two. The rubber elastic body 16 is provided with an appropriate bulge 18 for adjusting the spring constant.

The squeezing device includes a die 24 having a passage 22 through which the vibration isolating rubber 10 is inserted, a pressing head portion 26 formed into a cylindrical shape longer than at least the passage 22 and pressing the outer cylinder 14, End 26b on the side opposite to insertion of portion 26
And a holder 30 having a recess 28 for receiving the same. The holder 30 is mounted on a press (not shown), and has a shaft mounting hole 30a on the side opposite to the recess 28, into which the tip of a shaft (not shown) from the press is screwed. In addition, these dies 24,
The pressing head 26 and the holder 30 are each formed of a hard metal material.

A first guide portion 22a having a uniform inner diameter corresponding to the outer diameter of the outer cylinder 14 of the anti-vibration rubber 10 before diameter reduction is gradually provided in the passage 22 from the inlet side, and gradually toward the outlet side. A tapered portion 22b having a reduced diameter and a second guide portion 22c having an equal inner diameter smaller than the first guide portion 22a are formed continuously.
When 0 passes, the outer cylinder 14 is pressed against the inner wall of the passage 22 so that the diameter thereof is gradually reduced. Passage 22
A suitable chamfered portion 22d is formed at the opening edge on the entrance side of the device so that the vibration isolating rubber 10 can be easily inserted. The minimum inner diameter of the passage 22 is set smaller than the outer diameter of the outer cylinder 14 after drawing in consideration of a slight return. Although not shown in the figure, the die 24 is composed of a plurality of dies that form the respective portions 22a, 22b, and 22c of the passage 22, and the die that forms the tapered portion 22b is formed of a particularly hard metal. I have.

The pressing head 26 is composed of four pressing pieces 26A which are divided into four in the circumferential direction and extend in the longitudinal direction.
Each pressing piece 26A is swingably mounted in the recess 28 of the holder 30 via two bolt screws 32 (holding means). That is, the bolt screw 32 extends through the through hole 30b of the holder 30 having a larger diameter than the bolt screw 32 and extends in the radial direction. The tip of the bolt screw 32 is formed in the screw hole 27 formed in the non-insertion side end 26b of each pressing piece 26A. It is screwed.

Here, the outer diameter of the pressing head portion 26, that is, the outer diameter in a state where the adjacent pressing pieces 26A abut against each other, is determined from the inner diameter of the concave portion 28 by the amount of reduction of the outer cylinder 14 at the non-insertion side end portion 26b. Is set to the length obtained by subtracting
a, the length of the insertion-side end surface 26e is set to be in contact with the end surface of the outer cylinder 14, and the portion 2 between the both end portions 26a and 26b is set.
In FIG. 6c, the inner diameter of the passage 22 is set to be equal to or smaller than the inner diameter of the passage 22 so as not to interfere with the inner wall of the passage 22 when the passage 22 is inserted. In addition, a passage 2 is provided on the outer peripheral surface of each pressing piece 26A.
Insertion end 2 so as not to interfere with the inner wall surface of
Bending part 2 which gradually curves so as to have a large diameter toward 6a
6d are formed. Such a pressing head portion 26
Is formed in a hollow shape over the entire length for the purpose of weight reduction.

A coil spring 34 is provided around the bolt screw 32 as urging means for urging each pressing piece 26A toward the outer diameter side, that is, toward the inner peripheral wall surface 28b of the concave portion 28. That is, each coil spring 34 is interposed in a compressed state between the head 32a of the bolt screw 32 and the spring receiving portion 30c formed on the outer peripheral surface of the holder 30, and is fixed to the bolt screw 32 and the bolt screw 32. The pressed pressing piece 26A is constantly urged toward the outer diameter side.

In the state before drawing, each pressing piece 2
As shown in FIG. 1, the outer end 6A is urged to the outer peripheral side by a coil spring 34, so that the
The outer peripheral surface of b presses against the inner peripheral wall surface 28b of the concave portion 28 without any gap, and is held at the initial position extending in parallel with the axial direction of the pressing head portion 26. In this initial position, the adjacent pressing pieces 26A
A gap D having the same width is formed in the axial direction between the pressing pieces 2.
6A is inserted into the outer cylinder 14 over almost the entire circumference.
It comes into contact with the end face. Here, the gap D
Are set at appropriate intervals so that the difference between the diameter of the pressing head 26 before and after the drawing and the amount of drawing of the outer cylinder 14 are equal.

At the time of drawing, the outer cylinder 14 of the anti-vibration rubber 10 inserted from the entrance of the passage 22 is pressed by the insertion side end surface 26e of the pressing piece 26A, and the anti-vibration rubber 10 is pressed into the depth of the passage 22. I will do it. Then, when passing through the tapered portion 22b of the passage 22, the outer cylinder 14 is pressed against the inner wall of the passage 22 and is gradually reduced in diameter, and finally is reduced in diameter by a predetermined throttle amount.

Here, the insertion side end 26a is connected to the passage 2
When passing through the second tapered portion 22b, as shown in FIG. 2, it is pressed against the inner wall of the passage 22, and swings toward the inner diameter side around the non-insertion end 26b. That is, each pressing piece 26A moves to the inner diameter side so that the insertion side end 26a approaches each other, while the opposite insertion side end 26b is urged to the outer diameter by the coil spring 34, and the recess 28
Abuts against the inner peripheral wall surface 28b of the
The posture becomes slightly inclined with respect to the axis so that the a side is tapered.

According to the present embodiment as described above, the pressing piece 2
Since the insertion-side end 26a of 6A is configured to swing around the non-insertion-side end 26b, the anti-insertion-side end 26f pressed against the bottom surface of the recess 28, that is, the pressure-receiving surface 28a,
The pressing piece 26A hardly moves in the radial direction.
As a result, abrasion of the non-insertion side end face 26f can be minimized, and the durability of the expansion device itself can be improved.

Further, the axial length of each pressing piece 26A is sufficiently long with respect to the aperture diameter, and in this embodiment, it is 3
Since it is set to be twice or more, the radius of rotation when the insertion-side end 26a of the pressing piece 26A swings becomes large, and the inclination of the pressing piece 26A with respect to the axis can be reduced. As a result, the pressing piece 26A always comes into contact with the inner wall surface of the passage 22 near the insertion side end 26a, and the insertion side end 26
e does not come off the end face of the outer cylinder 14.

Further, in this embodiment, a curved portion 26d which is curved toward the insertion side end 26a is formed on the outer peripheral surface of the pressing piece 26A so as to avoid interference with the inner wall of the passage 22. 26A always comes into contact with the inner wall of the passage 22 near the insertion-side end 26a, so that the insertion-side end surface 26e can be more reliably prevented from coming off the end surface of the outer cylinder 14.

The inner diameter of the recess 28 and the end 2
Since the difference between the outer diameter of the pressing head portion 26 and the outer diameter of the pressing head portion 6b is equal to the aperture amount, the aperture amount can be easily set.

Further, in the present embodiment, the passage 22 of the die 24 is formed in accordance with the outer diameter of the outer cylinder of the vibration isolating rubber and the amount of drawing, and the outer side of the pressing head 26 is formed with respect to the vibration isolating rubber to be drawn. The diameter is set to the length obtained by subtracting the amount of contraction from the inner diameter of the concave portion 28 at the non-insertion side end 26b.
In the case of a, the length may be set so that the insertion-side end surface 26e abuts on the outer cylinder end surface. That is, since the dimensions of the die 24 and the pressing head 26 can be uniquely set based on the dimensions of the vibration-proof rubber and the amount of reduction, the setting operation is extremely easy.

Further, since the holder 30, the bolt screw 32 and the coil spring 34 are not involved in the size and the amount of diaphragm of the vibration isolating rubber, the present invention can be applied as it is to a diaphragm device of the vibration isolating rubber having different outer diameters and amounts of diaphragm. can do.

For example, as shown in FIG.
When performing the drawing process of the vibration-isolating rubber 40 having the outer diameter of the outer cylinder 42 larger than that of the outer cylinder 42, a die 44 and a pressing head 46 are used instead of the die 24 and the pressing head 26,
Holder 30, bolt screw 32 and coil spring 3
4 can be the one shown in FIGS. Here, the passage 48 of the die 44 may be formed to have a size corresponding to the outer diameter of the outer cylinder 42 of the vibration isolating rubber 40 inserted therein and the amount of contraction. At the side end 46a, the insertion side end surface 46e is
May be set to a length that abuts the end face of the outer cylinder 42 at the non-insertion side end 46 b.

The present invention is not limited to the above-described embodiment. For example, the pressing head may be constituted by six pressing pieces divided into six, or a leaf spring may be used instead of the coil spring 34. Other urging means may be used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a diaphragm device according to the present invention.

FIG. 2 is a cross-sectional view showing one process of drawing using the drawing device of FIG. 1;

FIG. 3 is a bottom view of the diaphragm device of FIG. 1;

FIG. 4 is a cross-sectional view when the diaphragm device of FIG. 1 is applied to a different vibration-proof rubber.

FIG. 5 is a partial sectional view showing a conventional diaphragm device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Anti-vibration rubber 14 ... Outer cylinder 20 ... Throttling device 22 ... Passage 22b ... Taper part 26 ... Pressing head part 26A ... Pressing piece 26a ... Insertion side end part 26b ... Anti-insertion side end part 28 ... Depression 30 ... Holder 32 ... Bolt screw 34 ... Coil spring

Claims (3)

[Claims] 1. A tapered portion having a passage through which a vibration-proof rubber is inserted, and a tapered portion having a diameter gradually reduced toward an outlet so as to reduce a diameter of an outer cylinder of the vibration-proof rubber passing through the passage. And a pressing head formed at least in a cylindrical shape longer than the passage and pressing the outer cylinder into the passage, and a concave portion for receiving an end of the pressing head opposite to the insertion side. The pressing head portion is composed of a plurality of pressing pieces that are divided in the circumferential direction and extend in the axial direction of the pressing head portion, and furthermore, a predetermined gap is provided between adjacent pressing pieces. As described above, an urging means for urging the end of the pressing piece on the side opposite to the insertion side toward the inner peripheral wall side of the recess, and the insertion side end of each pressing piece is pressed against the inner wall of the passage so as to be radially inward. Removably holds the end of each pressing piece on the opposite side of insertion so that it can move Anti-vibration rubber diaphragm and wherein the holding means further comprising a that. 2. The holding means is a screw which extends radially through the holder and is screwed to an end of the pressing piece on the side opposite to the insertion side. The diaphragm device according to claim 1, wherein the diaphragm is a coil spring that is compressed between the coil springs and biases the screw in the outer diameter direction. 3. An outer diameter of the pressing head portion is set so as to abut against an outer diameter of the outer cylinder at an insertion-side end, and an inner diameter of the holder concave portion and a throttle amount of the outer cylinder at an opposite insertion-side end. The diaphragm device according to claim 1, wherein the difference is set to: