JP6435117B2 - Manufacturing method of connecting member - Google Patents

Description

  The present invention relates to a connecting member comprising a screw fitting and an elastic member attached to the screw fitting.

  Conventionally, as shown in FIG. 11, there is provided a connecting member 101 including a pair of metal screw fittings 102 and 102 and a rubber intermediate member 103 inserted between the pair of screw fittings 102 and 102. ing. More specifically, the screw fitting 102 includes a metal bolt 104 including a shaft portion 120 in which a screw groove 130 is formed and a large-diameter portion (head portion) 110 provided at one end of the shaft portion 120. And a plate-shaped washer 200 having a through hole into which the shaft portion 120 of the bolt 104 is inserted. The bolt 104 is inserted into the washer 200, and the large diameter portion 110 and the washer 200 are welded and fixed at a position where the washer 200 is in contact with the surface of the large diameter portion 110 of the bolt 104.

  Further, the shaft portions 120, 120 of the pair of screw fittings 102, 102 are arranged on the same axis line, and the shaft portions 120 are inserted in opposite directions to each other between the large diameter portions 110, 110. The intermediate member 103 is attached to the connecting member 101. And the connection object member (illustration omitted) provided with the internal thread is respectively screwed by the both screw parts 130 of this connection member 101, and is used.

  The screw fitting is manufactured by the following procedure. First, a metal bolt base material composed of a rod-shaped shaft portion and a large-diameter portion (head portion) provided at one end of the shaft portion is prepared by, for example, header processing, and a thread groove is formed in the shaft portion of the bolt base material. Is formed by rolling to obtain a bolt. On the other hand, a plate-shaped washer having a through-hole into which the shaft portion can be inserted is prepared, the bolt is inserted into the washer, the washer and the large diameter portion of the bolt are brought into contact, and welding is performed at that position. To fix each other. Then, the screw fitting and the elastic member as the intermediate member are baked and bonded. Thereby, a connection member is obtained.

  Further, the connecting member as described above may be manufactured by other procedures. For example, a configuration disclosed in Patent Document 1 can be proposed.

  Furthermore, as another example, as shown in FIG. 12, it is composed of a single screw fitting 102 and an elastic member (specifically, an anti-vibration rubber) 103 which is an intermediate member bonded to the screw fitting 102. The connecting member 101 is already provided. Such a connecting member has a vibration absorbing function or a damping function, and is employed, for example, in a place where vibration isolation is required in an automobile, and the washer 200 and the bolt 104 are fixed by welding.

International Publication No. WO2006-004084

  However, in the above conventional configuration, in addition to the process of forming screw grooves in the bolt base material, it is necessary to separately perform a welding process after assembling. There was a problem that soared. In addition, since high heat is locally applied to the places to be connected and fixed at the time of welding, there is a drawback in that distortion is likely to occur in the corresponding places and dimensional accuracy and strength are reduced. Furthermore, when an external force F is repeatedly applied toward the center through the shaft portions of both bolts as shown in FIG. 11, a load is applied to the welded portion between the large diameter portion of the bolt and the washer, and finally cracking occurs. There was a possibility that the bolt would come out of the washer due to the breakage or the connection between the large diameter portion and the washer being broken. Such a problem caused when a load is applied to the welded part is, of course, the same in a so-called one-side bolt type connecting member as shown in FIG.

Therefore, the present invention provides a method for manufacturing a connecting member that simplifies the manufacturing process of the connecting member that can securely fix the washer to the bolt, shortens the manufacturing process, and reduces the manufacturing cost. The purpose is to do.

The present invention is a connecting member comprising a screw fitting and an elastic member attached to the screw fitting, wherein the screw fitting includes a shaft portion in which a thread groove is formed, and the shaft portion provided on the shaft portion. A large-diameter portion whose outer diameter is larger than the outer diameter of the portion, and a metal bolt comprising a plate-shaped washer having a through-hole into which a shaft portion of the bolt is inserted, A bolt is inserted into the washer, and one plate surface of the washer is in contact with a large diameter portion of the bolt, and the elastic member is attached to one plate surface of the washer. The present invention relates to a connecting member characterized in that a retaining portion formed by swelling from the surface of the shaft portion of the bolt is in contact with the other plate surface.

  In this configuration, the washer is clamped from both sides by the large-diameter portion of the bolt and the retaining portion formed on the shaft portion, so that the bolt is removed from the washer via the shaft portion of the bolt. Even when an external force in the pulling-out direction is repeatedly applied, the washer is regulated by the retaining portion, so that it is possible to prevent rattling and the bolt from being pulled out. Therefore, even if it is a case where it is used in the severe environment where a load is repeatedly applied, the robustness or durability of the entire connecting member is surely improved.

  In the above configuration, a press-fit portion that is continuously formed with the retaining portion may be press-fitted between the shaft portion of the bolt and the inner peripheral surface of the through hole of the washer.

  If a gap remains open between the shaft portion of the bolt and the inner peripheral surface of the through hole of the washer, the washer and the bolt may rotate relatively. By adopting the configuration, it is possible to reliably prevent loosening that may occur between the bolt and the washer.

  Further, it is preferable that a high surface portion and a low surface portion having relatively different heights are formed in one surface of the washer, and a large diameter portion of the bolt is disposed on the low surface portion. .

  In the connecting member, the elastic member is attached to the washer so as to cover the large-diameter portion of the bolt. According to the above configuration, the large-diameter portion of the bolt protrudes toward the elastic member. The amount to be reduced can be reduced as much as possible. In other words, it is possible to suppress as much as possible that the volume of the elastic member is pressed and reduced by the large diameter portion. That is, it is possible to sufficiently ensure the vibration absorption or damping characteristics of the elastic member. In particular, in recent years, since the installation space of the connecting member is severely restricted and the product height is generally strictly regulated, the above configuration also suppresses the product height in this respect. There is an advantage that a product can be provided. Further, the washer can be partially thinned, and the total weight of the connecting member can be suitably suppressed from becoming excessively heavy.

  Moreover, it is desirable that the zenith portion of the large diameter portion of the bolt is disposed at a height substantially the same as the high surface portion of the washer or at a height position lower than the high surface portion.

  In such a configuration, since the large diameter portion of the bolt does not excessively enter the elastic member side, the volume of the elastic member can be prevented from being reduced, and the vibration absorbing effect or damping effect of the elastic member can be prevented. Can be secured to the maximum. In addition, since the large diameter portion of the bolt can be prevented from protruding toward the elastic member, the joining surface between the washer and the elastic member can be made uniform, compared with a configuration in which the large diameter portion protrudes. Thus, the mutual bonding strength can be sufficiently ensured.

  The high surface portion and the low surface portion of the washer are coupled via a stepped flat portion parallel to the axial direction of the bolt, and at least a part of the outer peripheral surface of the large diameter portion of the bolt is A configuration is proposed in which the flat surface portion is in surface contact.

  By setting it as this structure, it can prevent that the said volt | bolt and the said washer rotate relatively around the axis | shaft of this volt | bolt.

  The bolt may be a countersunk bolt.

  By adopting such a configuration, the height of the large diameter portion of the bolt can be made as low as possible, and as a result, the height of the connecting member as a whole can be made as low as possible.

  Moreover, in the axial part of the said bolt, the small diameter part smaller than the cylindrical part diameter of this bolt may be provided in the position between the said securing part and a thread part.

  In the case of such a configuration, an elastic region can be intentionally formed in the shaft portion by the small diameter portion, so that there is an advantage that the axial force is improved as the connecting member.

  The washer is preferably a two-sided width shape.

  By adopting such a configuration, it is possible to make it easier to take a measure to prevent rotation when the nut is fastened to the washer.

The present invention also relates to a method of manufacturing a connecting member comprising a screw fitting and an elastic member attached to the screw fitting, the rod-shaped shaft portion, and the outer diameter of the shaft portion provided on the shaft portion. A plate-shaped washer having a through-hole into which the shaft portion can be inserted is inserted into a metal bolt base material made of a large-diameter portion having a large outer diameter, and then one of the washers. The plate surface is brought into contact with the large-diameter portion of the bolt base material and the shaft portion is made to flow toward the washer by rolling to form a thread groove in the shaft portion of the bolt base material. The bolt base material is used as a bolt, and a small-diameter portion smaller than the cylindrical portion diameter of the bolt is made to flow between the screw groove and the washer, and the meat of the shaft portion is caused to flow toward the washer side. And is bulged from the surface of the shaft portion on the washer side with respect to the small diameter portion. A retaining portion that abuts the other plate surface while allowing the flesh of the shaft portion to flow toward the washer side, and between the shaft portion of the bolt base material and the inner peripheral surface of the through hole of the washer. And a press-fitting portion formed continuously with the retaining portion is press-fitted .

  Such a configuration can form a retaining part by flowing the flesh of the shaft part while forming a thread groove in the bolt base material in one rolling process, so welding that was conventionally necessary A process becomes unnecessary. For this reason, the manufacturing process can be remarkably simplified, and a large amount of production can be performed in a shorter time than in the past. Further, since it is not necessary to locally apply high heat to the place to be connected and fixed, there is no possibility that the member is distorted, and the dimensional accuracy and strength are not reduced.

  Furthermore, you may make it press-fit the press-fit part continuously formed with the said retaining part between the axial part of the said bolt base material, and the internal peripheral surface of the through-hole of the said washer.

  By adopting such a configuration, it is possible to reliably prevent loosening that may occur between the bolt and the washer. Further, since the press-fitting portion can be formed continuously when forming the retaining portion, the manufacturing process does not increase excessively or become complicated.

  Further, a small diameter portion that is smaller than the cylindrical portion diameter of the bolt at a position between the retaining portion and the screw portion in the shaft portion of the bolt, and the flesh of the shaft portion flows to the washer side. A configuration is proposed in which it is formed while being formed.

  With this configuration, the small-diameter portion can be formed in the process of forming the retaining portion, and the manufacturing process does not increase excessively or become complicated.

Further, a rolling process for a mold used in the method of manufacturing a connecting member of the upper SL has a mold surface which processing target to roll, mold surface, forms a screw groove on the shaft portion of the bolt base material The bolt base material is used as a bolt, and the shaft portion is made to flow toward the washer side to form a retaining portion that bulges from the shaft surface and contacts the other plate surface of the washer. A rolling mold having the characteristics described above is proposed .

  By adopting such a configuration, it is possible to suitably perform the rolling process, and there is an advantage that the production efficiency of the screw fitting is remarkably improved.

  The mold surface is formed continuously with the retaining portion, and forms a press-fit portion that is press-fitted between the shaft portion of the bolt base material and the inner peripheral surface of the through hole of the washer. You may be made into the shape to do.

  With such a configuration, it is possible to provide a connecting member in which loosening that may occur between the bolt and the washer is prevented. In addition, since this press-fitting part is formed continuously when forming the retaining part, the manufacturing process does not increase excessively or becomes complicated.

  Further, the mold surface is in the shaft portion of the bolt, and a small diameter portion smaller than the diameter of the cylindrical portion of the bolt is provided at a position between the retaining portion and the screw portion. The shape may be formed while flowing toward the washer side.

  With such a configuration, it is possible to provide a connecting member with improved axial force.

The connecting member can securely fix the washer and the bolt, and has the effect of dramatically improving the robustness of the connecting member.

  Moreover, the manufacturing method of the connection member of this invention has the outstanding effect that a manufacturing process is simplified, the period which manufactures can be shortened, and mass production is attained by a rolling process.

It is a partial sectional side view of a connection member. (A) is a side view of a bolt base material, (b) is a cross-sectional view taken along line AA of (a), and (c) is a cross-sectional view taken along line BB of (a). (A) is a top view of a washer, (b) is CC sectional view taken on the line of (a). It is explanatory drawing which shows the manufacturing process of a screw metal fitting, (a) shows the state which penetrated the volt | bolt base material to the washer, (b) shows the state which gave the rolling process, (c) is the state of (b) The X portion is shown enlarged. It is an external appearance perspective view of an elastic member. It is explanatory drawing which shows the modification 1. FIG. It is explanatory drawing which shows the modification 2. FIG. The connection member of the modification 3 is shown, (a) is a partial sectional side view, (b) is a top view. The washer concerning the modification 3 is shown, (a) is a sectional side view, (b) is a top view. The washer concerning the modification 4 is shown, (a) is a sectional side view, (b) is a top view. It is a fragmentary sectional side view which shows a 1st conventional structure. A 2nd conventional structure is shown, (a) is a front view, (b) is a side view.

  Hereinafter, embodiments embodying the present invention will be described in detail. In addition, this invention is not limited to the Example shown below, A design change is possible suitably.

  As shown in FIG. 1, the connecting member 1 includes a pair of metal screw fittings 2 and 2 and a rubber elastic member 3 inserted and fixed between the pair of screw fittings 2 and 2. It is configured. The connecting member 1 has a shaft portion 12 in which a thread groove 13 is formed. The shaft portions 12 are arranged on the same axis line and are respectively pushed out in opposite directions.

  More specifically, the screw fitting 2 includes a metal bolt 4 including a shaft portion 12 in which a screw groove 13 is formed and a large-diameter portion (head portion) 11 provided at one end of the shaft portion 12. And a plate-shaped washer 20 having a through hole 21 into which the shaft portion 12 of the bolt 4 is inserted. On the other hand, the elastic member 3 is formed of a cylindrical body as shown in FIG. 5, and both flat surfaces thereof are in surface contact with the large-diameter portion 11 and the washer 20 of the screw fitting 2.

Next, the manufacturing method of the said connection member 1 is demonstrated according to FIG.
First, a metal bolt base material 10 comprising a round bar-shaped shaft portion 12 as shown in FIG. 2 and a large diameter portion 11 larger than the outer diameter of the shaft portion 12 provided at one end of the shaft portion 12. Prepare. Also, a two-sided washer 20 having a through hole 21 at the center as shown in FIG. 3 is prepared. Then, the bolt base material 10 is inserted into the washer 20 while the bolt base material 10 and the washer 20 are transferred by the parts feeder. The diameter of the through hole 21 of the washer 20 is set to be larger than the outer diameter of the shaft portion 12 of the bolt base material 10 and smaller than the outer diameter of the large diameter portion 11.

  Next, at the position where the washer 20 is brought into contact with the large diameter portion 11 of the bolt base material 10 (see FIG. 4a), the shaft portion of the bolt base material 10 is formed by rolling using a rolling die. A screw groove 13 is formed on the tip end side of the bolt 12 to make the bolt base material 10 the bolt 4 and the flesh of the shaft portion 12 is caused to flow toward the washer 20 to bulge from the surface of the shaft portion 12. Thus, a retaining portion P that presses against and contacts the plate surface disposed on the screw groove side of the washer 20 is formed (see FIGS. 4b and 4c), and the screw fitting 2 is obtained. The retaining portion P is preferably pressure-bonded to the inner periphery of a concave counterbore portion 21 </ b> A formed at the hole edge of the through hole 21 of the washer 20. However, the washer 20 may of course have no counterbore 21A.

  And in the said screw metal fitting 2, while each shaft part 12 and 12 is arrange | positioned on the same axis line, and each large diameter part 11 and 11 is mutually spaced apart, the said elastic member 3 is inserted, for example, Each is fixed by baking. Thereby, the connection member 1 is produced.

  In the connecting member 1, a connecting object member (not shown) provided with a female screw is screwed into the thread grooves 13 provided on both sides, thereby being used as a connecting tool having an anti-vibration function. The

  In the above configuration, the washer 20 is clamped from both sides by the large-diameter portion 11 of the bolt 4 and the retaining portion P formed on the shaft portion 12. Even when the external force F toward the center is repeatedly applied, the position of the washer 20 is regulated by the retaining portion P, so that the bolt 4 does not come out.

  Further, in the manufacturing method of the screw fitting 2 described above, the retaining portion P is formed by flowing the meat of the shaft portion 12 while forming the screw groove 13 in the bolt base material 10 in one rolling process. Therefore, the welding process that has been necessary in the past is unnecessary, and the manufacturing process can be greatly simplified. Further, since high heat is not locally applied, the member is not distorted, and dimensional deviation and strength reduction can be suppressed.

[Modification 1]
As shown in FIG. 6A, a gap k is formed between the shaft portion 12 of the bolt base material 10 and the inner peripheral surface of the through hole 21 of the washer 20. 6 (b), at the position where the washer 20 is brought into contact with the large-diameter portion 11 of the bolt base material 10, the bolt base material 10 is changed to the bolt 4 by rolling, and the shaft portion. The press-fitting portion Q that is continuously formed with the retaining portion P may be press-fitted into the gap k while the 12 meat flows to the washer 20 side to form the retaining portion P. .

  By adopting such a configuration, it is possible to reliably prevent loosening that may occur between the bolt 4 and the washer 20. Further, since the press-fit portion Q can be formed continuously when the retaining portion P is formed, the manufacturing process does not increase or become complicated.

  Further, as shown in FIG. 6B, a so-called cylinder of the bolt 4 is provided in the shaft portion 51 of the bolt 4 between the retaining portion P and the screw portion in which the screw groove 13 is formed. A small diameter part 52 smaller than the part diameter D may be provided.

  The small diameter portion 52 may be formed while flowing the flesh of the shaft portion 51 toward the washer 40 when forming the retaining portion P and the screw groove 13 during the rolling process. it can.

[Modification 2]
Moreover, as shown in FIG. 7, the structure around the through-hole 21 of the washer 20 is a countersink shape, and the countersunk | screw-type bolt base material 10 may be inserted. Moreover, it is not limited to this, The shape of the large diameter part 11 of the volt | bolt base material 10 may be shapes, such as a round shape. More specifically, in the surface of the washer 20 on the elastic member 3 side, a high surface portion 41 having a relatively different height and a low surface portion 42 formed of a tapered surface are formed. The large-diameter portion 11 of the bolt (counter bolt) 4 is disposed. And the zenith part of the large diameter part 11 of this volt | bolt 4 is distribute | arranged to the height position substantially the same as the high surface part 41 of the said washer 20. As shown in FIG. Note that the large diameter portion 11 of the bolt 4 made of a so-called flat head bolt has a polygonal shape in plan view, and the shape of the through hole 21 of the washer 20 corresponds to the shape of the large diameter portion 11. You may make it aim at rotation prevention.

[Modification 3]
Further, as shown in FIGS. 8A and 9A, a high surface portion 41 and a low surface portion 42 having relatively different heights are formed in the surface of the washer 40 on the elastic member 3 side, The large diameter portion 31 of the bolt 4 may be arranged on the lower surface portion 42 of the washer 40. In the present embodiment, the high surface portion 41 and the low surface portion 42 are formed along a direction orthogonal to the axis of the bolt 4 and are arranged in parallel to each other.

  More specifically, as shown in FIGS. 9A and 9B, the washer 40 has a concave shape around the through hole 21 and is surrounded by a step flat portion 43 in a plan view regular hexagon. The lower surface portion 42 is formed. On the other hand, as shown in FIG. 8B, the large-diameter portion 31 of the bolt 4 also has a regular hexagonal shape in a plan view having a dimension corresponding to the low surface portion 42, and the zenith portion 32 is formed in FIG. As shown in FIG. 4, the height is substantially the same as that of the high surface portion 41. The step flat portion 43 stands upright with respect to the low surface portion 42, in other words, the high surface portion 41 and the low surface portion 42 are coupled via the step flat portion 43. It has a step structure. Further, since the step flat portion 43 is parallel to the axial direction of the bolt 4, the washer 40 and the bolt 4 are brought into surface contact between the step flat portion 43 and the side surface of the large diameter portion 31. And relative rotation is prevented.

  Of course, the zenith portion 32 of the large-diameter portion 31 may be disposed at a height position lower than the high surface portion 41. Further, the large-diameter portion 31 may protrude toward the elastic member 3 to such an extent that the volume of the elastic member 3 is substantially reduced and the vibration absorption effect or the damping effect is not hindered.

  Furthermore, a washer 50 as shown in FIG. 10 may be employed. In this configuration, a low-surface portion 42 having a circular shape in plan view surrounded by the step flat portion 43 is formed. Further, the through hole 21 has a regular hexagonal shape in plan view. The shape of each part of the bolt (not shown) is determined according to the shape of the washer 50.

  In addition, the dimension shape of each site | part in the screw metal fitting 2 described so far can be changed suitably. Further, other well-known means can be appropriately selected as the fixing means for the screw fitting 2 and the elastic member 3. In addition, chemical treatment or physical treatment may be performed on a required portion in order to increase mutual fixing strength. Moreover, the material of the bolt 4 and the washers 20, 40, 50 in the screw fitting 2 can be appropriately selected from known materials as long as they are suitable for rolling. The elastic member 3 in the connecting member 1 is preferably a rubber material having a rubber hardness of a predetermined value or less, for example. However, the numerical value can be appropriately selected, and the material is not limited to the rubber material. As the elastic member, various materials having a vibration absorbing function or a damping function can be selected, and the spring constant set as the connecting member can be appropriately changed in design. Moreover, the dimension shape of this elastic member can be suitably changed according to a use environment. Of course, the use environment and application of the connecting member 1 are not particularly limited. Moreover, in the connection member 1, the screw metal fitting 2 does not need to be a pair, and may be a shape provided with only one.

DESCRIPTION OF SYMBOLS 1 Connection member 2 Screw metal fitting 3 Elastic member 4 Bolt 10 Bolt base material 11,31 Large diameter part 32 Zenith part 12,51 Shaft part 13 Screw groove 20,40,50 Washer 21 Through-hole 41 High surface part 42 Low surface part 43 Level surface Part 52 Small diameter part P Stopping part Q Press-fit part

Claims (6)

A method of manufacturing a connecting member comprising a screw fitting and an elastic member attached to the screw fitting,
A through-hole that allows the shaft portion to be inserted into a metal bolt base material comprising a rod-shaped shaft portion and a large-diameter portion provided on the shaft portion and having a larger outer diameter than the outer diameter of the shaft portion. Insert a plate-shaped washer with a hole,
Next, one plate surface of the washer is brought into contact with the large diameter portion of the bolt base material, and the shaft portion of the bolt base material is caused to flow toward the washer by rolling. A screw groove is formed in the portion to make the bolt base material a bolt, and a small diameter portion smaller than the cylindrical portion diameter of the bolt is formed at a position between the screw groove and the washer. And a retaining portion that bulges from the shaft surface and contacts the other plate surface of the washer on the washer side rather than the small diameter portion. And press-fitting a press-fitting portion formed continuously with the retaining portion between the shaft portion of the bolt base material and the inner peripheral surface of the through hole of the washer. The manufacturing method of the connection member characterized by the above-mentioned. The high surface portion and the low surface portion having relatively different heights are formed in one surface of the washer, and a large diameter portion of the bolt is disposed on the low surface portion. Manufacturing method of the connecting member. The zenith part of the large diameter part of the said bolt is a manufacturing method of the connection member of Claim 2 distribute | arranged to the height position substantially the same as the high surface part of the said washer, or lower than this high surface part. The high surface portion and the low surface portion of the washer are coupled via a stepped flat portion parallel to the axial direction of the bolt, and at least a part of the outer peripheral surface of the large diameter portion of the bolt is a stepped flat surface of the washer. The manufacturing method of the connection member of Claim 2 or Claim 3 which is surface-contacting to the part. The method for manufacturing a connecting member according to claim 2, wherein the bolt is a countersunk bolt. The method for manufacturing a connecting member according to claim 1, wherein the washer has a two-sided width shape.

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