JP2016065590A - Resilient structure, its process of manufacture, fastening band and its process of manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resilient structure of which productivity is improved at a low cost, its process of manufacture, a fastening band having a superior sealing characteristic that can be fastened while supplementing its fastening reaction force by the resilient structure even if the fastening reaction force cannot be obtained from the fastened object under application of this resilient structure and a process of manufacture of the fastening band of superior manufacturing efficiency.SOLUTION: This invention comprises a plate 6A formed into a curved band-like shape by a metallic sheet material and a resilient body 6B connected to the plate 6A side through a connection part 6g and having at least one spring part 6b curved and formed to have a larger curvature than that of the plate 6A and flat portions 6c1, 6c2, the resilient body 6B bent through the connecting part 6g is arranged on a curved salient surface 6a of the plate 6A in such a way that the flat portions 6c1 and 6c2 are overlapped to cause the curved spring part 6b to protrude.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, an elastic structure suitably used for a tightening band for tightening an object to be tightened by reducing the diameter of a band member formed in an annular shape, a manufacturing method thereof, and a tightening band and a manufacturing method thereof.

  For example, the hose clamp is formed in an annular shape so that the inner and outer band ends overlap with each other, and the tightening device is fixed to the inner band portion, and the tightening screw is assembled to mesh with the notches (slits) formed in the outer band portion. When the tightening screw is rotated in a predetermined direction, the band member is reduced in diameter, and when it is rotated in the opposite direction, the band member is increased in diameter.

  In this hose clamp, an elastic structure (spring device) is attached to the inner circumferential surface of the band member in order to prevent the tightening force from acting due to deterioration over time of an object to be tightened (such as a hose). ing. The spring device is assembled integrally, for example, by stacking curved leaf springs on a plate. The leaf spring is formed into a wave shape having a plurality of projections and depressions, and is integrally assembled by caulking and folding a pair of fixed claws formed on both side surfaces of the plate in a central recess. Also, a pair of fixing claws are formed in the width direction on both sides in the longitudinal direction of the plate, and the spring device is attached to the hose clamp by folding these fixing claws on the outer peripheral surface of the band member (Patent Document) 1; see FIGS. 1 and 2).

Japanese Patent Publication No. 7-26711

Since the elastic structure of Patent Document 1 described above is produced using a separate press mold for the plate and the leaf spring, the production cost increases.
In addition, the plate and the leaf spring are produced and then overlapped, and a pair of fixed claws formed on the plate are crimped and folded over the leaf spring, which increases the production process and increases production efficiency and workability. Also decreases.

  The object of the present invention is to solve the above-mentioned problems of the prior art, reduce the cost and improve the productivity, and the manufacturing method thereof, and even if the tightening reaction force cannot be obtained from the object to be tightened using the elastic structure. It is an object of the present invention to provide a tightening band having a good sealing property that can be tightened by supplementing a tightening reaction force with an elastic structure, and a method for manufacturing a tightening band with high production efficiency.

In order to achieve the above object, the present invention comprises the following configuration.
That is, an elastic structure that imparts a spring force by elastically deforming a spring portion by an external force, wherein the metal plate material is connected to a curved belt-like plate, and is connected to the plate side portion via a connecting portion, An elastic body having at least one spring portion and a flat portion that are curved so as to have a larger curvature than the plate, and the elastic body that is bent on the curved convex surface of the plate via the connecting portion. The spring portion formed by overlapping and bending the flat portion is disposed so as to project.
As a result, when the metal plate material is conveyed between the progressive molds, the plate and the elastic body are integrally formed, and the spring portion curved by the elastic body bent via the connecting portion protrudes on the curved convex surface of the plate. As described above, since the flat portions are arranged so as to overlap each other, the production efficiency of the elastic structure is good and the production cost can be reduced.

The elastic body is formed with the curved spring portions on both sides of the flat portion connected to the connecting portion, and a constricted groove-shaped throttle portion along the longitudinal direction at the center in the width direction of each spring portion. Is preferably formed.
Thereby, the intensity | strength of the spring part which deform | transforms tightening operation or time can be improved.

On the end surface portion opposite to the connecting portion of the plate, a bent portion standing on the curved convex surface side may be erected along the longitudinal direction.
Accordingly, it is possible to improve the strength of the plate on which the reaction force from the object to be tightened against the tightening force acts.

The metal plate is preferably made of stainless steel having spring characteristics.
Thereby, the plate and the elastic body can be integrally laminated by press working (punching, bending, etc.), and productivity can be improved.

  If any one of the elastic structures described above is used by using a tightening band in which the plate portion is joined and integrally assembled so that the spring portion comes into contact with the inner peripheral surface of the annular band member, Even if a tightening reaction force cannot be obtained from an object, it is possible to provide an inexpensive tightening band having a good sealing property that can be tightened by compensating the tightening reaction force with an elastic structure.

  In the manufacturing method of the elastic structure, the long metal strip is fed between the progressive molds and connected to the frame part via the first connecting part and formed along the longitudinal direction of the frame part. A punching process in which a first metal plate and a second metal plate connected to the first metal plate through a second connecting portion and formed along the longitudinal direction of the first metal plate are punched out by a press. And, after the punching step, a first forming step of bending and forming an elastic body having at least one spring portion that is continuous with the flat portion with respect to the second metal plate material and has a larger curvature than the plate and protrudes downward. Then, after the first forming step, the second metal forming material is formed into a plate having a curved convex surface having a curvature lower than that of the spring portion, and after the second forming step, the elasticity Fold the body at the second connecting part An overlapping step of forming an elastic structure in which the flat portion is overlapped on the plate so that the spring portion protrudes on the curved convex surface; and a first step of connecting the elastic structure to the frame portion. A cutting step in which one connecting portion is cut into pieces, and the elastic structures separated into pieces are connected to the curved convex surface of the plate via the second connecting portions. The flat portions are overlapped, and the spring portion protrudes from the curved convex surface.

  As a result, a long metal strip is pressed while being continuously fed to the progressive die, and a plate and an elastic body having different curvatures are integrally formed using the progressive die, on the curved convex surface of the plate. In addition, the elastic structure can be integrally formed so that spring portions having different curvatures protrude on the curved convex surface, so that the production efficiency is good and the productivity is improved at a low cost.

  In the first forming step, when the spring portion is formed, a narrowed portion having a curved convex surface recessed at the center in the width direction of the spring portion may be formed. Thereby, it is possible to manufacture a reinforced spring portion while reducing the number of man-hours by simultaneously drawing the elastic body.

After the first forming step, a bent portion that rises opposite to the spring portion may be erected along the longitudinal direction on the end surface portion of the first metal plate on the first connecting portion side. .
Thereby, it is possible to improve the strength of the plate on which the reaction force from the object to be tightened acts on the tightening force while reducing the number of steps.

  At this time, in the punching step, it is preferable that notches are respectively formed on both sides of the first connection portion of the first metal plate member connected to the frame portion via the first connection portion. Thereby, it becomes easy to bend a bending part with respect to a 1st metal plate material.

In addition, the elastic band manufactured by using any one of the above-described elastic structure manufacturing methods described above, and the plate so that the spring portion comes into contact with the inner peripheral surface of the annular band member. The parts are preferably joined together and assembled together.
Thereby, even if the tightening reaction force cannot be obtained from the object to be tightened, a tightening band having a good sealing property that can be tightened by compensating the tightening reaction force by the elastic structure can be efficiently produced.

  As described above, it is possible to provide an elastic structure with improved productivity at a low cost and a method for manufacturing the same, and a seal that can be tightened without using a tightening reaction force from an object to be tightened. It is possible to provide a method for manufacturing a fastening band with good performance and a fastening band with high production efficiency.

It is a perspective view which shows the state before and behind the process of an elastic structure. It is the top view and top view which show the manufacturing process of the elastic structure of FIG. It is front explanatory drawing which shows the example of an assembly | attachment with respect to the fastening band of an elastic structure.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
First, a tightening band for tightening a constant velocity joint boot as an example of mounting an elastic structure will be described with reference to FIG.
The constant velocity joint boot is provided to cover the joint portion between the joint case and the shaft and prevent leakage of grease sealed in the bearing portion in the joint case and entry of foreign matter. In addition, in the following, a boot made of resin such as a thermoplastic polyester elastomer (TPEE) is directly fitted into an outer race constituting a tripart joint without using an elastic member such as a grommet. It is assumed that the outer periphery is fixed to a reduced diameter by a fastening band.

  As shown in FIGS. 3A and 3B, the fastening band 1 includes a band member 2 in which a metal band member (for example, SUS430) is formed in an annular shape. The band member 2 is formed in an annular shape by a joint portion 2a in which inner peripheral surfaces at both ends are joined by resistance welding. A lever 3 (for example, SUS430) formed in an arc shape is fixed to the joint portion 2a by resistance welding. The lever 3 can reduce the diameter of the band member 2 by tilting the other end side 3b with the one end side 3a contacting the outer peripheral surface of the band member 2 as a fulcrum.

  A buckle 4 (for example, SUS430) is fixed to the inner peripheral surface of the band member 2 by resistance welding. The buckle 4 includes a bent piece 4b that stands up radially outward from both ends of the base portion 4a that is joined to the inner peripheral surface of the band member 2, and is bent to a lever 3 that is inclined to the outer peripheral surface of the band member 2. The lever 4 is bent from both sides so that the pieces 4b are overlapped, and the return of the lever 3 is suppressed and fixed.

  In addition, an arc-shaped plate 5 (for example, SUS430) is provided on the inner peripheral surface of the band member 2 so as to cover the gap on the inner peripheral side of the joint portion 2a along the circumferential direction. The plate 5 is fixed so that the fixed end 5a is fixed adjacent to the buckle 4 and freely covers the gap on the inner peripheral side of the joint portion 2a in the band member 2 bent by the tilting of the lever 3 along the circumferential direction. The end 5b extends in an arc shape.

  As shown in FIG. 3 (A), since the plate 5 receives bending stress from the fulcrum (one end side 3a) of the lever 3, a pair of upstanding walls 5c that rises radially outward on both sides in the width direction of the plate 5 are provided. It is provided continuously in the longitudinal direction. As a result, the plate 5 is formed in a U-shaped cross section and is reinforced so as to be difficult to be deformed by increasing the section modulus as a whole. Moreover, as a reinforcement structure of the plate 5, instead of providing a pair of standing walls 5c, a groove may be formed along the longitudinal direction of the plate 5, or the wall 5c and the groove may be used in combination.

  As shown in FIG. 3 (B), an elastically deformable elastic structure 6 is fixed to the inner peripheral surface of the band member 2 by, for example, resistance welding at both ends. As the elastic structure 6, a stainless steel metal material having spring characteristics (for example, SUS301) is preferably used.

The elastic structure 6 is sandwiched between an object to be tightened (for example, a resin boot) and the band member 2 when the band member 2 is reduced in diameter, and applies a tightening reaction force from the object to be tightened.
Here, the configuration of the elastic structure 6 will be described with reference to FIGS. The elastic structure 6 applies a spring force by elastically deforming the elastic body 6B (spring part 6b) laminated on the plate 6A by an external force.
The plate 6A is formed by bending the first metal plate 6a1 (see FIG. 1A) into a curved band (see FIG. 1C). The elastic body 6B is alternately formed with spring portions 6b and flat portions 6c1 and 6c2 that are curved by press-molding the second metal plate 6a2 (see FIG. 1A) (see FIG. 1C). The first metal plate 6a1 and the second metal plate 6a2 are connected via a connecting portion 6C (second connecting portion 6g described later) (see FIG. 1A). The elastic body 6b is formed by overlapping the flat portions 6c1 and 6c2 on the plate 6A so that the spring portion 6b protrudes on the curved convex surface 6a by bending the connecting portion 6C (FIG. 1 ( B) (see (C)).

  A bent portion 6a3 erected from the curved convex surface 6a may be erected along the longitudinal direction on the end surface portion opposite to the connecting portion 6C of the plate 6A (see FIG. 1B). Thereby, the strength improvement of the plate 6A to which the reaction force from the object to be fastened against the tightening force acts can be achieved. Moreover, as for the 1st metal plate material 6a1, the 2nd metal plate material 6a2, and the connection part 6C (2nd connection part 6g) shown to FIG. 1 (A), the stainless steel type metal material (for example, SUS301) which has a spring characteristic is used suitably, for example. It is done.

  1B and 1C, the elastic body 6B has at least one spring portion 6b and flat portions 6c1 and 6c2 that are curved so as to have a larger curvature than the plate 6A. Specifically, the elastic body 6B is formed with curved spring portions 6b on both sides of the flat portion 6c1 connected to the connecting portion 6C (second connecting portion 6g), and is formed at the end of each spring portion 6b. Are provided with flat portions 6c2. In addition, the number of the spring parts 6b formed in the elastic body 6B is not limited to two, and may be more or less.

  The elastic body 6B is formed with spring portions 6b that are curved on both sides of the flat portion 6c1 connected to the connecting portion 6C (second connecting portion 6g), and in the center of each spring portion 6b in the longitudinal direction. It is preferable that a groove-shaped throttle portion 6b1 is formed along the groove. Thereby, the intensity | strength of the spring part 6b which deform | transforms tightening operation | movement and time-dependent can be improved.

  The elastic body 6B overlaps the flat portions 6c1 and 6c2 so that the spring portion 6b formed by bending the connecting portion 6C (second connecting portion 6g) on the curved convex surface 6a1 of the plate 6A is projected on the curved convex surface 6a. Are arranged together. As a result, the plate 6A and the elastic body 6B are integrally formed from the metal plate 6a, and the connecting portion 6C (second connecting portion 6g) is bent so that the spring portion 6b protrudes on the curved convex surface 6a of the plate 6A. Since the flat portions 6c1 and 6c2 are arranged so as to overlap each other, the production efficiency is good and the production cost can be reduced.

  As shown in FIG. 3B, any of the elastic structures 6 described above is joined to the plate 6A so that the spring portion 6b abuts against the inner peripheral surface of the band member 2 formed in an annular shape. 6 may be integrally assembled to the tightening band. As a result, even if a tightening reaction force cannot be obtained from an object to be tightened (for example, a resin boot), a tightening band having a good sealing property that can be tightened by compensating the tightening reaction force by the spring portion 6b of the elastic structure 6 can be inexpensively produced. Can be provided.

  Here, an example of a method for manufacturing the elastic structure 6 will be described with reference to the process diagram of FIG. The long metal strip 6a0 (for example, stainless steel SUS301 having spring characteristics) is pressed while being fed sequentially between the progressive dies through the pilot holes 6d, and the elastic structure 6 is manufactured. 2A to 2G exemplify a case where one process is performed at the position of the continuous pilot hole 6d.

  Specifically, a first metal plate material 6a1 connected to the metal strip plate material 6a0 via the first connection portion 6f to the frame portion 6e and corresponding to the plate 6A along the longitudinal direction of the frame portion 6e, and the first metal plate material A second metal plate member 6a2 connected to 6a1 via the second connecting portion 6g and corresponding to the elastic body 6B along the longitudinal direction of the first metal plate member 6a1 is punched and formed by a press (punching step; FIG. 2). (See (A)). The first metal plate member 6a1 and the second metal plate member 6a2 are punched symmetrically about the centers of the first connecting portion 6f and the second connecting portion 6g (see FIG. 2B). In the punching step, it is desirable that notches 6h are formed on both sides of the first connecting portion 6f of the first metal plate 6a1 connected to the frame portion 6e via the first connecting portion 6f. Thereby, it becomes easy to bend | fold the bending part 6a2 with respect to the 1st metal plate material 6a1 at a post process.

  Next, after the punching step, a pair of spring portions 6b protruding downward is formed between the flat portion 6c1 and the flat portion 6c2 with respect to the elastic body 6B (first forming step; see FIG. 2C). ). The curvature of the spring portion 6b is bent so that the curvature is larger than that of the plate 6A described later. In addition, the spring part 6b may be one place or may be formed in three or more places.

  In the first molding step, when the spring portion 6b is formed, a narrowed portion 6b1 having a convex surface recessed at the center of the spring portion 6b is formed (see FIG. 2C). Thereby, when the elastic body 6B is formed, the reinforced spring portion 6b can be manufactured while performing drawing processing to reduce the number of steps.

  In addition, after the first forming step, the bent portion 6a3 may be erected along the longitudinal direction on the end surface portion on the first connecting portion 6f side of the first metal plate 6a1 (see FIG. 2D). ). The height of the bent portion 6a3 is determined by the depth of the notch 6h. Thereby, the strength improvement of the plate 6A to which the reaction force from the object to be fastened against the tightening force acts can be achieved.

  After the first forming step, the first metal plate 6a1 is pressed to form a plate 6A having a curved convex surface 6a so as to be convex upward as a whole (second forming step; see FIG. 2E). . The curvature of the plate 6A at this time is bent so as to be smaller than the curvature of the spring portion 6b. At this time, the plate 6A and the elastic body 6B are connected via the second connecting portion 6g in a state where the curved convex surface is inverted upside down.

  After the second forming step, the elastic structure 6 is formed by bending the second connecting portion 6g of the elastic body 6B so that the spring portion 6b protrudes upward and overlapping the flat portions 6b1 and 6b3 on the curved convex surface 6a of the plate 6A. Is formed (overlapping step; see FIG. 2F). At this time, the plate 6A and the frame portion 6e remain connected by the first connecting portion 6f.

Next, the first connecting portion 6f that connects the elastic structure 6 to the frame portion 6e is cut into individual pieces (cutting step; see FIG. 2G).
As a result, the flat portions 6b1 and 6b3 are separated into individual pieces so that the spring portion 6b in which the elastic body 6B is curved protrudes from the curved convex surface 6a of the plate 6A via the second connecting portion 6g. The elastic structure 6 is manufactured.

  As described above, the plate 6A and the elastic body 6B having different curvatures are integrally formed while continuously feeding the metal strip 6a0 to the progressive die, and the elastic body 6B is connected to the curved convex surface 6a of the plate 6A in the second connection. The elastic structure 6 in which the spring portion 6b curved by overlapping the flat portions 6b1 and 6b3 while being connected to the portion 6g is projected on the curved convex surface 6a is manufactured. In this manner, the elastic structure 6 in which the elastic body 6B is superimposed on the plate 6A can be integrally manufactured by performing pressing while continuously feeding the long metal strip 6a0 to the progressive die. By omitting the production process, productivity is improved at low cost.

Further, the elastic structure 6 manufactured by using the method for manufacturing the elastic structure 6 described above is configured so that the spring portion 6b contacts the inner peripheral surface of the annular band member 2 as shown in FIG. 3B. It is preferable that the plate 6A is joined and integrally assembled.
Thereby, even if the tightening reaction force cannot be obtained from the object to be tightened, it is possible to efficiently produce the tightenable tightening band 1 that can be tightened by compensating the tightening reaction force by the elastic structure 6 and can be tightened.

  Although the one-touch type (type having the lever 3) has been described as the fastening band 1 to which the elastic structure 6 is mounted, other clamping materials such as a fastening band that pulls and locks the inner and outer band ends so as to overlap each other. It is also possible to apply to.

  DESCRIPTION OF SYMBOLS 1 Tightening band 2 Band member 2a Joint part 3 Lever 4 Buckle 4a Base part 4b Bending piece 5 Plate 5a Fixed end 5b Free end 5c Standing wall 6 Elastic structure 6A Plate 6B Elastic body 6C Connection part (6g 2nd connection part) 6a0 Metal strip plate material 6a1 First metal plate material 6a2 Second metal plate material 6a3 Bending portion 6a Curved convex surface 6b Spring portion 6b1 Restriction portion 6c1, 6c2 Flat portion 6d Pilot hole 6e Frame portion 6f First connecting portion 6h Notch

Claims (10)

An elastic structure that applies a spring force by elastically deforming a spring portion by an external force,
A plate formed into a curved band shape of a metal plate,
An elastic body having at least one spring portion and a flat portion that are connected to the plate side portion via a connecting portion and are curved so as to have a larger curvature than the plate;
The elastic structure is characterized in that the elastic body bent through the connecting portion is arranged on the curved convex surface of the plate so that the spring portion which is curved by overlapping the flat portion is projected. .   The elastic body is formed with the curved spring portions on both sides of the flat portion connected to the connecting portion, and a constricted groove-shaped throttle portion along the longitudinal direction at the center in the width direction of each spring portion. The elastic structure according to claim 1, wherein:   3. The elastic structure according to claim 1, wherein a bent portion that erects on the curved convex surface side is erected along the longitudinal direction on an end surface portion opposite to the connecting portion of the plate.   The elastic structure according to any one of claims 1 to 3, wherein a stainless steel material having spring characteristics is used for the metal plate material.   5. The elastic structure according to claim 1, wherein the plate portion is joined and integrally assembled so that the spring portion comes into contact with an inner peripheral surface of an annular band member. Tightening band. A long metal strip is fed between progressive molds, connected to the frame portion via a first connecting portion, and formed along the longitudinal direction of the frame portion, and the first A punching step of forming a second metal plate material connected to the metal plate material via the second connecting portion and formed along the longitudinal direction of the first metal plate material, by punching with a press,
After the punching step, a first forming step of forming a curved elastic body having at least one spring portion that is continuous with the flat portion with respect to the second metal plate material and has a larger curvature than the plate and protrudes downward;
After the first forming step, a second forming step of forming a plate having a curved convex surface that is convex upward with a smaller curvature than the spring portion of the entire first metal plate,
After the second forming step, the elastic body is bent at the second connecting portion to form an elastic structure in which the flat portion is overlaid on the plate so that the spring portion protrudes on the curved convex surface. An overlaying process to
Cutting the first connecting part connecting the elastic structure with the frame part into pieces,
In the elastic structure separated into pieces, the elastic body connected via the second connecting portion overlaps the curved convex surface of the plate, and the flat portion protrudes from the curved convex surface. The manufacturing method of the elastic structure characterized by the above-mentioned.   The method for manufacturing an elastic body according to claim 6, wherein, in the first forming step, when the spring portion is formed, a narrowed portion having a curved convex surface is formed at a central portion in the width direction of the spring portion.   The bent portion that stands up on the side opposite to the spring portion is erected along the longitudinal direction on the end surface portion of the first metal plate after the first forming step. Item 8. A method for producing an elastic structure according to Item 7.   The manufacturing of the elastic structure according to claim 8, wherein in the punching step, notches are respectively formed on both sides of the first connection part of the first metal plate member connected to the frame part via the first connection part. Method.   The elastic structure manufactured by using the method for manufacturing an elastic structure according to any one of claims 6 to 9, wherein the spring portion is applied to an inner peripheral surface of an annular band member. A method of manufacturing a tightening band in which the plate portions are joined so as to come into contact with each other.

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