JP4429700B2 - Anti-vibration device manufacturing method - Google Patents

Description

  The present invention relates to a bush-type vibration isolator and the like and a method for manufacturing the same, and more particularly to a structure in which a cylindrical portion of a bracket is wound from a flat plate.

A bush type vibration isolator is known, and an inner cylinder is surrounded by an outer cylinder, an elastic vibration isolation member is provided between them, a bracket is provided on the outer cylinder, and the bracket is attached to and supported by the vehicle body by this bracket. What is made is known. Also known are a structure in which a flat plate is wound to form a collar and a mounting portion is welded to the outer periphery of the collar to form a bracket (see Patent Document 1), and a flat plate is wound to form an outer cylinder (see Patent Document 2). It is. Further, it is also known that a bracket to be extruded is integrally formed with a pair of attachment portions that protrude in a substantially orthogonal direction within an axial orthogonal plane (see Patent Document 3).
JP-A-8-207535 Japanese Patent Laid-Open No. 10-281212 Japanese Patent Laid-Open No. 11-25147

  The method of winding the cylindrical portion of the bracket from a flat plate has the advantage that the bracket can be manufactured at low cost. However, in the conventional configuration in which a separate attachment portion is attached to such a cylindrical portion by welding, the more the number of attachment portions, the more labor is required for manufacturing and the inside of the cylindrical portion is caused by heat during welding. In order to prevent the rubber from being affected, it is necessary to fit the rubber into the cylindrical portion after welding the mounting portion, and the cylindrical portion and the rubber cannot be integrated in advance. Was constrained. Therefore, there is a demand for a bracket that does not bend when the attachment portion is attached and that does not have any restrictions on the manufacturing method. In addition, when the bracket is provided with a pair of mounting portions that are substantially orthogonal in the plane perpendicular to the axis of the cylindrical portion, and when trying to attach these to the vehicle body etc. from two directions that are substantially orthogonal, the vibration isolator is a kind of reinforcing cantilever support Therefore, it is necessary to increase the strength of the mounting portion. However, when the bracket is formed by winding from a flat plate, it is difficult to increase the plate thickness only at the mounting portion. Therefore, it is also desirable to easily reinforce the mounting portion.

  Further, in order to reinforce the attachment portion, it is also conceivable to apply a reinforcing member having a substantially L shape or the like between the pair of attachment portions arranged substantially orthogonally within the axis orthogonal plane of the cylindrical portion. However, when one is welded, current also flows to the other side, so that the other side may be in an incompletely welded state. However, there is no known method that can cope with such a situation. In view of the above, the present invention has an object to enable the reinforcing member to be welded to both attachment portions in a complete state even in such a case.

According to a first aspect of the present invention for solving the above-mentioned problems, a cylindrical portion formed by winding from a flat plate, and first and second protrusions projecting radially outward at a predetermined opening angle from the outer periphery thereof. A bracket provided with a mounting portion is provided, and an elastic vibration-proof member is accommodated inside the cylindrical portion, and the first and second mounting portions bend and extend from the winding end portion of the cylindrical portion. In the manufacturing method of the vibration isolator that is continuous with the cylindrical portion ,
An intermediate portion in the longitudinal direction of the flat plate is wound into a cylindrical shape to form the tubular portion, and both end portions in the longitudinal direction in the flat plate state in the vicinity of the winding end portion are predetermined before or at the time of forming the tubular portion. The first and second mounting portions are bent to form an opening angle, and the base portions of the first and second mounting portions are welded to each other to close the tubular portion and Forming,
Further, a reinforcing member having first and second reinforcing pieces corresponding thereto is disposed between the first and second mounting portions, and an opening angle formed by the first and second reinforcing pieces. Is made smaller in advance than an opening angle formed by the first and second mounting portions,
A state in which either one of the first or second reinforcing pieces is overlapped with one of the corresponding first or second mounting portions, and the other reinforcing piece is floated from the corresponding other mounting portion. In this state, weld one reinforcing piece and the mounting part,
Subsequently, the other reinforcing piece is bent and overlapped with the corresponding other attaching portion, and the other reinforcing piece and the attaching portion are welded in this state .

Claim 2, Oite to the claim 1, with respect to the first and second attachment portions, as well as reinforced by welding a reinforcing member that is folded into a substantially L-shape, of the cylindrical portion The winding end portion is covered from the outside with the reinforcing member.

Claim 3 is characterized in that the Oite to claim 2, injected integrating the elastic vibration isolating member to the inside of the tubular portion after the mounting of the reinforcing member.

According to the first aspect of the present invention, the intermediate portion of the single flat plate is wound into a cylindrical shape to form the cylindrical portion, and the first and second mounting portions are formed by bending both ends in the length direction when the flat plate is formed. In addition, since the first and second mounting portions are coupled and integrated with each other in the vicinity of the winding end portion of the cylindrical portion, the cylindrical portion and the mounting portion can be formed at the same time from a single flat plate. Two parts consisting of the first and second attachment parts can be formed simultaneously. Therefore, since it is not necessary to weld a separate attachment part, manufacture becomes easy. In addition, since it is not necessary to weld the first and second mounting portions to the cylindrical portion, the elastic vibration-proof member is tubed before the first and second mounting portions are joined, with the intermediate portion wound in a cylindrical shape. Since it can also be attached to the shaped part, the degree of freedom of the manufacturing method is increased.
Moreover, by welding each base part of a 1st and 2nd attachment part mutually, a 1st and 2nd attachment part can be integrally formed simultaneously with closing a cylindrical part. At this time, since the welded portion is the base portion of each of the first and second mounting portions, the welded portion is performed outside the tubular portion, and the elastic vibration-proof member is integrated inside the tubular portion. However, it is less susceptible to the thermal effects of welding. Accordingly, the degree of freedom of the manufacturing method is increased.
Further, the first and second mounting portions can be reinforced by reinforcing the first and second mounting portions with the reinforcing member, and the opening angle of the reinforcing member is set in advance from the opening angle of the first and second mounting portions. One of the first and second reinforcing pieces constituting the reinforcing member is overlapped and welded to the corresponding mounting portion. At this time, since the other reinforcing piece floats from the corresponding mounting portion, incomplete welding can be prevented. Subsequently, the other reinforcing piece is bent so that the opening angle is enlarged and overlapped with the other mounting portion, and then welded. As a result, the reinforcing member and the two reinforcing pieces form a predetermined opening angle. In addition, it is possible to avoid the occurrence of an incomplete welded state between each reinforcing piece and the mounting portion.

  According to the second aspect of the present invention, since the first and second mounting portions are reinforced by welding the reinforcing member folded in a substantially L shape, the mounting portion formed from a flat plate can be easily reinforced. . In addition, since the reinforcing member is substantially L-shaped, both the first and second mounting portions can be reinforced with one member, and the reinforcing member can be bent even if the opening angle of the first and second mounting portions changes. It can be handled freely by adjusting the corners. In addition, since the winding end portion of the cylindrical portion is covered by the reinforcing member, it can be reliably closed even if the coupling between the first and second mounting portions is relatively rough.

  According to the third aspect, when the liquid material of the elastic vibration-proof member is injected into the cylindrical portion inside the bracket according to the second aspect, the winding end portion of the cylindrical portion is covered by the reinforcing member. It can seal so that the liquid material of a vibration isolator may not leak from a winding end part.

  Hereinafter, an embodiment will be described based on the drawings. FIG. 1 is a front view of a bush type vibration isolator for an engine mount which is an embodiment product. The mount body 1 is surrounded by a cylindrical portion 20 of a bracket 2 and mounting portions 3 and 4 of an outer cylinder 2 are mounted on a vehicle body. It is attached to 5 with appropriate fastening members such as bolts. The cylindrical portion 20 is integrated with an outer cylinder and a conventional one in which the outer cylinder and the bracket are separated from each other so as to also serve as an outer cylinder. Reference numeral 6 denotes a mounting stay for mounting to a different location from the mounting portions 3 and 4. The attachment portions 3 and 4 correspond to first and second attachment portions, are provided so as to be substantially orthogonal to each other, and are fastened to the vehicle body 5 from an orthogonal direction. The opening angle between the attachment portions 3 and 4 is arbitrarily determined according to the attachment angle.

  The mount body 1 includes an inner cylinder 7 and an elastic body 8 formed around the inner cylinder 7. The elastic body 8 is made of an appropriate vibration-proof elastic material such as rubber, and is formed into a substantially cylindrical shape as a whole. The stay 6 is welded to a portion of the cylindrical portion 20 where the elastic body 8 is not provided and the elastic body 8 is not likely to be affected by heat. Reference numeral 9 denotes a counterbore that penetrates the elastic body 8 in the axial direction. Reference numeral 10 denotes an arm portion, which extends from the inner cylinder 7 to the opposite side and is connected to the cylindrical portion 20 at the distal end side. Reference numeral 11 denotes an upper stopper, and an elastic projection 12 provided on the upper portion of the inner cylinder 7 is brought into contact therewith. Reference numeral 13 denotes a lower stopper. The arm portion 10, the upper stopper 11, the protrusion 12, and the lower stopper 13 are integrally formed by the same elastic body 8.

2 and 3 are a side view (in the direction of arrow A in FIG. 1) and a bottom view (in the direction of arrow B in FIG. 1).
It is. 4 is a cross-sectional view corresponding to line 4-4 of FIG. As shown in these drawings, the outer cylinder 2 is formed by appropriately pressing a metal material such as iron into a substantially cylindrical shape, and includes a cylindrical portion 20 that integrates the elastic body 8 and mounting portions 3 and 4. It has continuous integration. Both end sides in the axial direction of the cylindrical portion 20 have a flange shape that is folded outward.

  The bracket 2 is formed by winding a single plate into a cylindrical shape, and at this time, by bending both ends of the plate at right angles to each other in the opposite direction, an attachment portion 3 projecting perpendicular to each other in the radial direction; 4 is integrally formed. Reference numerals 3a and 4a denote through holes such as mounting bolts formed in the mounting portions 3 and 4, respectively.

  FIG. 5 is an enlarged cross-sectional view of the base portions of the attachment portions 3 and 4. The attachment portions 3 and 4 are in contact with each other at the base portions 21 and 22, and the contact portions are welded to form a joint portion 23. (See FIG. 4). The connecting portion 23 corresponds to the winding end portion of the cylindrical portion 20, and more strictly, is a closed portion. Further, a reinforcing plate 24 having a substantially L-shaped cross section is welded and integrated between the attachment portions 3 and 4.

  The reinforcing plate 24 is a portion corresponding to each of the attachment portion 3 and the attachment portion 4, and the reinforcement piece portions 24a and 24b, which are first and second reinforcement pieces, are overlapped and welded by projection welding or the like. When either one of the reinforcing piece portions 24a or 24b is welded, if the other is in contact with the attachment portion 3 or the attachment portion 4, an electric current may flow to cause incomplete welding in strength.

  Therefore, the opening angle of the reinforcing plate 24 is bent in advance by an angle θ. However, the opening angle of each of the reinforcing pieces 24a and 24b only needs to be smaller than the opening angle of the attachment portions 3 and 4, and is determined according to the opening angle of the attachment portions 3 and 4. Subsequently, one of the reinforcing piece portions 24 a and 24 b, for example, the reinforcing piece portion 24 a is overlapped with the attachment portion 3 and welded. As a result, the reinforcing piece portion 24a and the attachment portion 3 are reliably welded, and the reinforcing piece portion 24b and the attachment portion 4 are not in contact with each other, so that incomplete welding is not performed.

  Next, the reinforcing piece portion 24b and the attaching portion 4 are welded while the reinforcing piece portion 24b is deformed and brought into close contact with the attaching portion 4. Thereby, the reinforcement piece part 24b and the attachment part 4 are also welded reliably. In addition, if the plate | board thickness of the reinforcement plate 24 is comparatively thin compared with the attachment part 3 and the attachment part 4, the deformation | transformation of the reinforcement piece part 24b is easy, and it can also weld it, bending easily by hand. Incidentally, the thickness of the bracket 2 in this embodiment is 2.5 mm, and the reinforcing plate 24 is 1.5 mm.

  In addition, the reinforcing plate 24 is welded to the attachment portion 3 and the attachment portion 4 to reinforce the attachment portion 3 and the attachment portion 4 and to join the base portions 21 and 22 that are the winding end portions of the cylindrical portion 20. The part 23 is closed from the outside. Reference numeral 24c in FIG. 4 is a through hole formed in the reinforcing piece 24a so as to coincide with the through hole 3a. Reference numeral 24d in FIG. 2 denotes a substantially Y-shaped rib, which is formed over the first and second reinforcing pieces 24a and 24b.

  FIG. 6 is a view showing a method of forming the elastic body 8 inside the bracket 2 formed as described above. The bracket 2 is disposed in the space formed by the molds 30, 31 and 32, and the inner cylinder 7 and the cores 33 and 34 are placed in the inner space of the bracket 2. The cores 33, 34 are arranged in the corresponding part of the frame 9.

  Subsequently, when a liquid 35 such as liquid rubber is injected into the space between the cores 33 and 34 and heated and pressurized to be solidified by a process such as vulcanization, the arm portion 10, the upper stopper 11, and the protruding portion 12. The elastic body 8 including the lower stopper 13 and the like is formed and integrated with the inner cylinder 7 and the cylindrical portion 20 of the bracket 2 by baking or the like.

  At this time, the injected liquid 35 tends to leak out from the coupling part 23 of the root parts 21 and 22, which is the winding end part of the cylindrical part 20, but the outer side of the coupling part 23 is covered with the reinforcing plate 24. Since it is closed, it also serves as a seal that prevents the liquid 35 from leaking out.

  Next, the operation of this embodiment will be described. When the mounting portion 3 and the mounting portion 4 are reinforced with the reinforcing plate 24, the reinforcing plate 24 is made an acute angle in advance, and one of the reinforcing pieces 24a and 24b corresponds to the corresponding first mounting portion 3 or second mounting portion 4. Therefore, it is possible to reliably weld the other side while keeping the other side in a non-contact state and then adjusting the angle of the other side. Accordingly, the reinforcing plate 24 also has a predetermined opening angle between the two reinforcing pieces 24a and 24b. In addition, it is possible to avoid the occurrence of an incomplete welded state between the reinforcing pieces 24a and 24b and the first and second mounting portions 3 and 4.

  In addition, the first and second mounting portions 3 and 4 are reinforced by welding the reinforcing plate 24, which is a reinforcing member folded in a substantially L shape, so that the first and second mounting portions 3 and 4 are formed from flat plates. 2 attachment parts 3 and 4 can be easily reinforced. Moreover, since the reinforcing plate 24 is substantially L-shaped, both the first and second mounting portions 3 and 4 can be reinforced with a single member, and the opening angle at the first and second mounting portions 3 and 4 changes. Even so, it can be freely handled by adjusting the bending angle of the reinforcing plate 24. Moreover, when welding the other, it can be brought into close contact with the other side while being easily folded.

  Moreover, since the reinforcing plate 24 covers the coupling portion 23 that is the winding end portion of the cylindrical portion 20, the coupling between the first and second mounting portions 3 and 4 can be reliably closed even if the coupling is relatively rough. . In addition, since sealing is performed by covering the coupling portion 23 from the outside with the reinforcing plate 24, when the liquid 35 is injected into the cylindrical portion 20 of the bracket 2 to integrate the elastic body 8, It can serve as a seal that prevents leakage. Furthermore, a bracket in which the bracket and the mounting portion are integrated can be formed from a single plate material.

  Further, the bracket 2 is formed from a single flat plate, the intermediate portion thereof is wound into a cylindrical shape to form the cylindrical portion 20, and the first and second mounting portions are bent at both ends in the length direction when the flat plate is formed. 3 and 4, and the first and second mounting portions 3 and 4 are coupled and integrated with each other in the vicinity of the coupling portion 23, which is the winding end portion of the cylindrical portion 20. The cylindrical portion 20 and the attachment portion can be formed at the same time, and two attachment portions including the first and second attachment portions 3 and 4 can be formed simultaneously.

  Therefore, since it is not necessary to weld a separate attachment part, manufacture becomes easy. In addition, since it is not necessary to weld the first and second mounting portions 3 and 4 to the cylindrical portion 20, the first and second mounting portions 3 and 4 are attached at the stage where the intermediate portion is wound into a cylindrical shape. Since the elastic body 8 which is an elastic vibration-proof member can also be attached to the cylindrical part 20 before coupling | bonding, the freedom degree of a manufacturing method becomes high.

In addition, the first and second attachment portions are simultaneously closed by closing the cylindrical portion 20 at the coupling portion 23 by welding the base portions 21 and 22 of the first and second attachment portions 3 and 4 to each other. 3 and 4 can be formed integrally. At this time, since the welded portion is the coupling portion 23 of the base portions 21 and 22 in the first and second attachment portions 3 and 4, the welding portion is performed outside the tubular portion 20, and the tubular portion 20 is temporarily assumed. Even if the elastic body 8 is integrated in advance on the inside, it is difficult to receive the heat effect of welding. Accordingly, the degree of freedom of the manufacturing method is increased.

Front view of the bush type liquid seal vibration isolator according to the embodiment Side view Bottom view Sectional view along line 4-4 in FIG. Diagram showing the welding method of the mounting part Diagram showing injection process of elastic body

Explanation of symbols

1: mount body, 2: bracket, 3: first mounting portion, 4: second mounting portion, 5: vehicle body, 6: stay for mounting, 7: inner cylinder, 8: elastic body, 20: cylindrical portion 20, 23: coupling part, 24: reinforcing plate

Claims (3)

A cylindrical portion formed by winding from a flat plate and a bracket provided with first and second mounting portions projecting radially outward at a predetermined opening angle from the outer periphery thereof, are elastic on the inner side of the cylindrical portion In the manufacturing method of the vibration isolator which accommodates the vibration isolating member and is continuous with the tubular portion by bending and extending the first and second mounting portions from the winding end portion of the tubular portion . ,
An intermediate portion in the longitudinal direction of the flat plate is wound into a cylindrical shape to form the tubular portion, and both end portions in the longitudinal direction in the flat plate state in the vicinity of the winding end portion are predetermined before or at the time of forming the tubular portion. The first and second mounting portions are bent to form an opening angle, and the base portions of the first and second mounting portions are welded to each other to close the tubular portion and Forming,
Further, a reinforcing member having first and second reinforcing pieces corresponding thereto is disposed between the first and second mounting portions, and an opening angle formed by the first and second reinforcing pieces. Is made smaller in advance than an opening angle formed by the first and second mounting portions,
A state in which either one of the first or second reinforcing pieces is overlapped with one of the corresponding first or second mounting portions, and the other reinforcing piece is floated from the corresponding other mounting portion. In this state, weld one reinforcing piece and the mounting part,
Subsequently, superimposed to the other mounting portion corresponding bending the other reinforcing piece, preparation of anti-vibration apparatus characterized by welding the other of the reinforcing piece and the mounting portion in this state. The first and second attachment portions are reinforced by welding a reinforcing member folded in a substantially L shape, and the winding end portion of the cylindrical portion is covered with the reinforcing member from the outside. The manufacturing method of the vibration isolator according to claim 1 characterized by things. The method for manufacturing a vibration isolator according to claim 2, wherein the elastic vibration isolator is injected and integrated into the inside of the cylindrical portion after the reinforcement member is attached.

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