JP2010038195A - Torque rod and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque rod capable of easily and inexpensively forming a bracket fixture equipped with a first cylinder part on a one end side in the axial direction and a second cylinder part on the other end side facing a direction orthogonal to the first cylinder part, and a connecting part connecting the two cylinders, from a single metal plate material. <P>SOLUTION: The one end side of the single metal plate material having a flat plate shape is rolled into a cylinder having a closed shape to form the first cylinder part 14, and the second cylinder part 16 facing the direction orthogonal to the first cylinder part 14 is formed by applying burring processing to the other end side. The bracket fitting 12 is formed by the first cylinder part 14, the second cylinder part 16, and the plate-like connecting part 18. The torque rod 10 is structured by assembling a first rubber bush 22 to the first cylinder part 14 and a second rubber bush 24 to the second cylinder part 16 by press-fitting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a torque rod that is interposed between an engine side and a body side of a vehicle, regulates displacement in the roll direction and forward / backward displacement of the engine, and also performs vibration isolation between the engine side and the body side. And a manufacturing method thereof.

2. Description of the Related Art Conventionally, a first rubber bush is attached to a first cylindrical portion of a bracket fitting in which a first cylindrical portion on one end side and a second cylindrical portion on the other end side are connected by a connecting portion, and a second rubber bush is attached to a second cylindrical portion. Torque rods that are assembled by press-fitting each of them are interposed between the engine side and the body side of the vehicle, and the torque rod receives torque from the engine side to change the displacement in the roll direction and the displacement in the front-rear direction of the engine. Regulations are being made.
The torque rod also has a function of vibration isolation between the engine side and the body side.

  Conventionally, as this torque rod, the first cylinder part and the second cylinder part, that is, the axial orthogonal type torque rod in which the directions of the first rubber bush and the second rubber bush are orthogonal, and the first rubber bush and the second rubber bush. There are axially parallel (coaxial) torque rods that face each other in parallel directions, and are used in accordance with the mounting position on the vehicle, the mounting structure, and the like.

FIG. 9 shows an example of a conventionally known torque rod of the former type (disclosed in Patent Document 1 below).
In the figure, reference numeral 200 denotes a torque rod, and 201 denotes a bracket fitting in the torque rod 200.
The bracket fitting 201 is provided with a cylindrical first tube portion 202 on one end side, and a second tube portion 204 is provided on the other end side in a direction orthogonal to the first tube portion 202. These are connected to each other by a connecting rod (connecting portion) 206.
Here, the bracket fitting 201 is integrally joined by welding the connecting rod 206 and the first cylindrical portion 202, and the connecting rod 206 and the second cylindrical portion 204, respectively.

  The first rubber bush 208 is assembled to the first tube portion 202 of the bracket fitting 201, and the second rubber bush 210 is assembled and held to the second tube portion 204 by press-fitting.

  Here, the first rubber bush 208 includes a cylindrical metallic inner cylinder 212 having a cylindrical shape, a cylindrical rubber elastic body 216 integrally vulcanized and bonded around the inner cylinder 212, and the rubber elastic body 216. And a cylindrical metal sleeve 214 fixed to the outer peripheral surface of the first cylindrical portion 202 by vulcanization adhesion. The metal sleeve 214 is press-fitted into the first cylindrical portion 202.

  The second rubber bushing 210 includes a cylindrical metallic inner cylinder 218 that is also cylindrical, a rubber elastic body 222 that is integrally vulcanized and bonded around the inner cylinder 218, and a vulcanized adhesive on the outer peripheral surface thereof. And a cylindrical metal sleeve 220 fixed thereto, and the metal sleeve 220 is press-fitted into the second cylindrical portion 204.

  However, in the case of the torque rod 200, three parts are required as the connecting rod 206, the cylindrical first cylindrical portion 202, and the second cylindrical portion 204 as the components of the bracket fitting 201, and the number of components is large. These welding processes are indispensable at the time of attachment, which increases the cost of the bracket fitting 201 and complicates the process for assembling the three parts.

Conventionally, it has been proposed to form a bracket metal fitting by pressing a single metal plate material.
For example, the following Patent Document 2 discloses a device for a panal rod, in which a first tube portion and a second tube portion are formed by performing burring on one end and the other end in the axial direction of a single metal plate. And the first rubber bush and the second rubber bush are assembled by press-fitting and held therein.
However, what is disclosed in Patent Document 2 is an axial parallel type in which the first cylinder part and the second cylinder part, that is, the first rubber bush and the second rubber bush face the parallel direction. The target is different.

  On the other hand, in Patent Document 1 below, a single metal plate material is also pressed to form a first tube portion on one end side, a second tube portion on the other end side, and a first tube portion on the first tube portion. It is disclosed that the rubber bush and the second rubber bush are assembled and held by press-fitting to the second cylinder part, respectively.

  The one described in this Patent Document 1 is an axial orthogonal type in which the first rubber bush and the second rubber bush are oriented in the orthogonal direction, and disclosed in this Patent Document 1 in order to make those axial directions orthogonal to each other. In this case, both sides of the metal plate are bent at right angles to the connecting main body between them to form a pair of side plates, and the pair of side plates and the connecting main body are arranged in directions orthogonal to each other. The first cylinder part and the second cylinder part are each formed by burring.

  In those disclosed in Patent Document 1 and Patent Document 2, both the first tube portion and the second tube portion are formed by burring, but in this way, the first tube portion and the second tube portion are formed. There is the following problem in forming any part by burring.

Usually, in the torque rod, a small rubber bush having a small outer diameter is used as one of the first rubber bush and the second rubber bush (here, referred to as the first rubber bush for convenience), and the other (for convenience, the second rubber bush and A large rubber bush with a large outer diameter is used.
In this case, the first rubber bush made of a small rubber bush has a solid structure in which the rubber elastic body does not have a straight portion penetrating in the axial direction, and the spring rigidity is increased, while the second rubber bush made of a large rubber bush. In order to provide the torque rod with the required characteristics, the rubber elastic body has a straight portion that penetrates in the axial direction.

In this case, in order to press-fit the second rubber bush having the straight portion into the second cylinder portion, in the second rubber bush, a metal sleeve is fixed to the outer peripheral surface of the rubber elastic body by vulcanization adhesion, and the metal In the sleeve, the second rubber bush is press-fitted into the second cylinder portion.
Therefore, it is relatively easy to form the second cylinder portion holding the second rubber bush by burring.

In the second rubber bush, since the metal sleeve itself has a function of restraining the inner rubber elastic body and maintaining the shape, in the case of the second tube portion that holds this, the axial length thereof is the second rubber. It may be shorter than the metal sleeve of the bush, so it is relatively easy to form it by burring.
Further, since the second cylindrical portion has a large inner diameter, even if the metal plate is relatively thick, burring can be easily performed with a relatively small force.

  On the other hand, since the rubber elastic body has a solid structure with no straight portion for the small bush, the rubber elastic body is usually directly attached to the first tube portion without providing a metal sleeve as in the second rubber bush. It is possible to press fit.

  However, when the rubber elastic body is directly press-fitted into the first cylindrical portion in this way, the axial length of the first cylindrical portion is made equal to the axial length of the rubber elastic body, and the first cylindrical portion is elastically elastic. It is usually necessary to fit the body over almost the entire length in the axial direction, that is, to form the first cylindrical portion with a long axial length.

It is not easy to form such a long axial portion by burring, and since the first cylindrical portion has a small inner diameter, a strong force is required for the processing, and therefore the first diameter having a small diameter is required. In practice, it is technically difficult to form the cylindrical portion by burring.
In addition, it is not easy to form both the first cylindrical portion and the second cylindrical portion that are orthogonal to each other by burring processing on the metal plate material.

  For example, in the thing of patent document 1, in order to implement | achieve this, a burring process is given to each of a pair of side plate part, and the pair of side plate part is bent at right angle from the connection main-body part. At that time, each of the pair of side plate portions is subjected to burring, thereby forming one cylindrical portion. In this case, the burring portions formed on each of the pair of side plate portions are formed strictly coaxially. This involves technical difficulties.

  On the other hand, Patent Document 3 discloses an invention of an anti-vibration support device for an automobile suspension mechanism, in which one end side and the other end side of a steel metal plate material are wound, and the wound portion After the first rubber bush and the second rubber bush are press-fitted into each, the wound end portions are pressure-bonded to the connecting portion, and the pressure-bonded portions are joined by welding in this state, whereby each of the wound processing portions is joined to the first portion. It is configured that a cylindrical portion and a second cylindrical portion are configured, and a first rubber bush and a second rubber bush are assembled therein.

  The one disclosed in Patent Document 3 is an axially parallel type in which a first rubber bush on one end side and a second rubber bush on the other end side face in a parallel direction. And the second cylinder part are relatively easy to form by winding, but the first cylinder part on one end side and the second cylinder part on the other end side, that is, the first rubber bush and the second rubber bush, It is difficult to apply this to a torque rod of an axis orthogonal type in which is directed in an orthogonal direction.

Further, in the case of the one disclosed in Patent Document 3, the end of the wound portion remains open at the stage of winding, and after pressing each rubber bush, the opened end is closed and fixed by welding. Strictly speaking, at this time, the first tube portion and the second tube portion are formed.
At that time, the first rubber bush and the second rubber bush previously assembled in the step of joining the wound parts by welding are affected by heat, which may lead to deterioration of each rubber elastic body. There's a problem.

  On the other hand, in Patent Document 4 below, a bracket is made of a single metal material, a first tube portion and a second tube portion are formed on one end side and the other end side thereof, and a first rubber is formed there. Although the point that the bush and the second rubber bush are assembled in the fitted state is disclosed, the one disclosed in Patent Document 4 also has the first cylindrical portion and the second cylindrical portion oriented in the parallel direction. In addition to being different from the present invention in this respect, the one disclosed in Patent Document 4 uses an extruded material made of an aluminum alloy as a metal material. In this case, there is a problem that the thickness of the metal plate is inevitably increased and the cost for manufacturing the metal bracket is increased.

The following Patent Document 5 discloses that an aluminum alloy material is used to form an axially orthogonal bracket with the first tube portion and the second tube portion facing in an orthogonal direction. In No. 5, complicated processing is performed in order to form the first tube portion and the second tube portion in the direction perpendicular to the axis, resulting in high cost.
Further, those disclosed in Patent Document 4 and Patent Document 5 have an inherent problem that they cannot be applied to a bracket bracket made of strong steel.

JP 2003-206991 A Japanese Utility Model Publication No. 63-72334 JP-A-8-210408 JP-A-9-317988 JP 2006-112551 A

  The present invention is based on the circumstances as described above, the first tube portion on one end side in the axial direction, the second tube portion on the other end side facing the orthogonal direction to this, and a connecting portion for connecting them. The bracket can be easily formed from a single metal plate, and therefore the bracket can be easily and inexpensively formed with a small number of parts. From the bracket and a pair of rubber bushes press-fitted there An object of the present invention is to provide a torque rod and a method for manufacturing the same that can further reduce the cost of the product.

  Thus, claim 1 relates to a torque rod, wherein a first cylinder part on one end side and a second cylinder part provided on the other end side in a direction orthogonal to the first cylinder part are connected by a connecting part. The first rubber bush and the second rubber bush are press-fitted and assembled to the first tube portion of the bracket metal fitting, respectively, and are installed across the engine side and the body side of the vehicle. The first cylinder in which the axial direction is parallel to the plate surface by winding one end of a single flat metal plate into a cylindrical shape and closed shape And forming the second tube portion whose axial direction is perpendicular to the plate surface by burring the other end side of the metal plate material, the first tube portion, the second tube portion, The bracket member is constituted by a plate-like connecting portion between the first tube portion and the second tube portion, and the first tube portion Characterized in that said first rubber bushing, are assembled by press fitting the second rubber bush to the second cylindrical portion.

  According to a second aspect of the present invention, in the first aspect, the first cylindrical portion is formed with a small diameter and the second cylindrical portion is formed with a large diameter, and a small rubber bush having a small diameter is formed on the first cylindrical portion. The first rubber bush is press-fitted, and a large rubber bush having a large diameter is press-fitted as the second rubber bush.

  According to a third aspect of the present invention, there is provided a solid structure according to the second aspect, wherein the first rubber bush has a solid inner cylinder and a solid structure that is vulcanized and bonded around the inner cylinder and does not have a straight portion penetrating in the axial direction. A rubber elastic body, and the rubber elastic body is directly press-fitted into the first cylinder portion on the outer peripheral surface, and the second rubber bush is vulcanized around the inner cylinder and a rigid inner cylinder. A rubber elastic body having an axially penetrating portion bonded thereto, and a metal sleeve fixed to the outer peripheral surface of the rubber elastic body by vulcanization adhesion; It is press-fitted into the cylinder part.

  A fourth aspect relates to a method of manufacturing a torque rod, wherein a first cylinder part on one end side and a second cylinder part provided on the other end side in a direction orthogonal to the first cylinder part are connected by a connecting part. The first rubber bush and the second rubber bush are press-fitted and assembled to the first tube portion of the bracket metal fitting, respectively, and are installed across the engine side and the body side of the vehicle. A method of manufacturing an orthogonal shaft torque rod, in which one end of a single flat metal plate is wound into a cylindrical shape and closed so that the axial direction is parallel to the plate surface. And forming the second cylinder portion whose axial direction is perpendicular to the plate surface by burring the other end side of the metal plate material. The bracket fitting is constituted by two cylindrical portions and a plate-like connecting portion between the first cylindrical portion and the second cylindrical portion. The first rubber bushing to said first cylindrical portion in the subsequent, characterized in that it constitutes a torque rod assembly by respectively press-fitting the second rubber bush to the second cylindrical portion.

Effects and effects of the invention

  As described above, the present invention forms a first cylindrical portion in which one end side of a single flat metal plate is rolled into a cylindrical shape and a closed shape so that the axial direction is parallel to the plate surface. In addition, the other end side is subjected to burring to form a second cylindrical portion whose axial direction is perpendicular to the plate surface, the first cylindrical portion, the second cylindrical portion, and a plate-like connecting portion between them. The bracket metal fitting is constructed, and the first rubber bush is assembled to the first cylinder part and the second rubber bush is assembled to the second cylinder part by press-fitting to constitute a torque rod.

  According to the present invention, the bracket fitting having the first cylindrical portion on one end side and the second cylindrical portion on the other end side facing each other in the orthogonal direction can be easily processed and formed from a single metal plate material, Further, since the bracket metal fitting can be constituted by a single metal plate material without assembling a plurality of parts, it becomes possible to manufacture such a bracket metal fitting at a lower cost than in the prior art.

  In addition, by forming the first cylindrical portion on one end side by winding a metal plate and forming the second cylindrical portion on the other end side by burring, a pair of cylindrical portions facing each other in a perpendicular direction are formed of a single metal. It can be easily formed from a plate material.

  In the present invention, the first tube portion is formed with a small diameter and the second tube portion is formed with a large diameter, and a small rubber bush having a small diameter is press-fitted into the first tube portion as the first rubber bush. A large rubber bush having a large diameter can be press-fitted as the second rubber bush to constitute the entire torque rod (claim 2).

  Since the second cylindrical portion for the second rubber bush has a large diameter, that is, since the diameter of the hole provided in the metal plate before burring is large, the portion around the hole is cylindrical. In the bending process, this can be performed with a relatively weak force. Therefore, the burring process for forming the second cylindrical part can be easily performed with good moldability.

  On the other hand, the first tube portion for the small rubber bush has a desired strength especially for the bracket metal fitting because the hole diameter provided in the metal plate before burring is small when it is formed by burring. When the plate thickness is increased as much as possible, a strong force is required when forming the first tube portion by burring, and it is difficult to form the first tube portion with good formability by burring.

  However, according to the second aspect, since the first cylindrical portion having a small diameter is formed by winding, the first cylindrical portion can be easily formed with good formability even when the metal plate is thick. And this can be formed satisfactorily.

  3. A rubber elastic body having a solid structure according to claim 2, wherein the first rubber bush comprising a small rubber bush is bonded to a rigid inner cylinder and vulcanized around the inner cylinder, and has no axially penetrating portion. The rubber elastic body is directly press-fitted into the first cylinder portion, while the second rubber bush consisting of a large rubber bush is attached to the rigid inner cylinder and vulcanized and bonded around it. A rubber elastic body having a straight through portion and a metal sleeve fixed to the outer peripheral surface of the rubber elastic body by vulcanization adhesion. The metal sleeve is press-fitted into the second cylindrical portion. (Claim 3).

  In this way, even if the axial length of the second cylindrical portion formed by burring is shorter than the axial length of the second rubber bush, specifically the axial length of the metal sleeve, there is no problem. The second rubber bush can be held in the press-fit state by the first tube portion.

  On the other hand, the first cylinder part that does not have a metal sleeve and that directly press-fits and holds the rubber elastic body is formed by winding, so the first cylinder part is formed by burring. Compared to the case where the first cylindrical portion is formed, the first cylindrical portion can be formed with a sufficient length in the axial direction corresponding to the axial length of the first rubber bush, that is, the rubber elastic body. The bush can be held in a press-fit state.

  Next, claim 4 relates to the manufacturing direction of the torque rod. In this manufacturing method, one end side of a single flat metal plate is wound into a cylindrical shape and closed to form a first cylindrical portion. And forming the second cylindrical portion by burring the other end side, and thus configuring the bracket metal fitting, the first rubber bush and the second cylindrical portion are respectively formed on the first cylindrical portion and the second cylindrical portion. Two rubber bushes are assembled by press fitting to constitute a torque rod.

In the manufacturing method according to claim 4, not only the second cylinder part formed by burring but also the first cylinder part formed by winding is shaped as the first cylinder part before the rubber bushing is press-fitted. The assembly of the torque rod can be completed by press-fitting a rubber bush (first rubber bush) there.
In addition, according to the fourth aspect, before the first rubber bush is press-fitted according to the strength required for the first tube portion, the wound end portion may be joined in advance by welding.

  In any case, in claim 4, before the rubber bush is press-fitted, both the first cylinder part and the second cylinder part are completed in shape, and therefore, as disclosed in Patent Document 4 Therefore, it is not necessary to weld and join the wound parts after press-fitting the rubber bush. Therefore, the rubber elastic body of the already installed rubber bush is deteriorated by the heat effect by welding at that time. The set characteristics required for the first rubber bush can be satisfactorily exhibited after assembly.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a torque rod of this embodiment, and 12 is a bracket metal fitting.
In this embodiment, the bracket fitting 12 is made of a steel plate material. Here, the bracket 12 is made of JIS G 3113 and has a thickness of 4.5 mm.

The bracket metal fitting 12 includes a first cylindrical portion 14 having a small diameter on one end side, a second cylindrical portion 16 having a large diameter on the other end side, and a plate-like connecting portion 18 for connecting them. And the whole is integrally formed.
A flange portion 20 is also integrally formed around the second tube portion 16.

Here, the first tube portion 14 is formed so that the axial direction is parallel to the plate surface of the connecting portion 18 having a plate shape. On the other hand, the second cylinder portion 16 is formed with its axial direction oriented in a direction orthogonal to the plate surface of the connecting portion 18.
That is, the 1st cylinder part 14 and the 2nd cylinder part 16 are each formed in the mutually orthogonal direction.

  A first rubber bush (hereinafter simply referred to as a first bush) 22 composed of a small rubber bush (hereinafter simply referred to as a small bush) having a small outer diameter is assembled and held in the first cylindrical portion 14 by press-fitting. Further, a second rubber bush (hereinafter simply referred to as a second bush) 24 comprising a large rubber bush (hereinafter simply referred to as a large bush) having a large outer diameter is assembled to the second cylindrical portion 16 by press-fitting. Is held.

The torque rod 10 of this embodiment is interposed between the engine side and the body side with the first rubber bush 22 positioned on the engine side and the second rubber bush 24 positioned on the body side, for example. It receives the torque from the engine and regulates the displacement in the roll direction and the displacement in the front-rear direction of the engine.
The torque rod 10 also functions to isolate vibration between the engine side and the body side.
The first rubber bush 22 is fixed to the engine side in an inner cylinder 26 described later, and the second rubber bush 24 is fixed to the body side in an inner cylinder 32 described later.

  As shown in FIG. 2, the first rubber bush 22 includes a cylindrical metal inner cylinder 26 and a rubber elastic body 28 integrally vulcanized and bonded around the inner cylinder 26. The rubber elastic body 28 is press-fitted directly into the first cylindrical portion 14 on the outer peripheral surface and is held in a fitted state.

As shown in FIG. 2, the first rubber bush 22 has a solid structure in which the rubber elastic body 28 is assembled by press-fitting and does not have a straight through portion in the axial direction.
The first cylindrical portion 14 is formed so that its axial length is equal to the axial length of the rubber elastic body 28, and the rubber elastic body 28 is elastically compressed in the radial direction over the entire length. One tube portion 14 is fitted.

In the shape before press-fitting, the rubber elastic body 28 of the first rubber bush 22 is formed with an annular constriction portion 30 on one end side and the other end side in the axial direction as shown in FIG. ing. The constricted portion 30 disappears by press-fitting the first rubber bush 22 into the first cylindrical portion 14.
As shown in FIG. 2, both ends of the inner cylinder 26 in the first rubber bush 22 in the axial direction slightly protrude from the rubber elastic body 28 and the first cylinder portion 14 in the axial direction.

On the other hand, the second rubber bush 24 is made of a metal-made rigid inner cylinder 32 having a cylindrical shape as shown in FIGS. 2, 3 and 4B, and rubber vulcanized and bonded integrally therewith. An elastic body 34 and a cylindrical metal sleeve 36 that is integrally fixed to the outer peripheral surface of the elastic body 34 by vulcanization bonding are provided, and the metal sleeve 36 is assembled and held by press fitting into the second cylindrical portion 16. Has been.
Therefore, in this embodiment, the first rubber bush 22 and the second rubber bush 24 are assembled and held on the bracket fitting 12 so as to face each other in the orthogonal direction.

As shown also in FIG. 2, in the second rubber bush 24, the rubber elastic body 34 has straight portions 38 and 40 penetrating in the axial direction. A rubber main body 44 having a pair of rubber legs 42 and 42 in a form in which the elastic body 34 is opened in the shape of a letter C, and a right and left direction in the figure, that is, a connection between the rubber main body 44 and the straight portions 38 and 40. It is divided into a pair of rubber stopper portions 46, 48 facing the extending direction of the portion 18.
Here, the rubber stopper portion 46 abuts on the rubber main body portion 44 during acceleration to perform a stopper action, and the stopper portion 48 abuts against the rubber main body portion 44 during deceleration to perform a stopper action.

As shown in FIG. 2, the inner cylinder 32 is positioned such that its axis is eccentric to the left side in the drawing with respect to the axis of the metal sleeve 36.
As shown in FIGS. 1 and 3, the second cylindrical portion 16 has a shorter length in the axial direction than the second rubber bush 24, specifically, the metal sleeve 36. The portion protrudes from the second tube portion 16 in the axial direction, and the other portion is held by the second tube portion 16 in a state of being fitted to the second tube portion 16.

In the second rubber bush 24, the rubber elastic body 34 is formed with an axial length equal to or slightly shorter than the metal sleeve 36.
On the other hand, each end of the inner cylinder 32 in the axial direction protrudes up and down in the figure relative to the rubber elastic body 34 and the metal sleeve 36.

In the present embodiment, the bracket fitting 12 is formed by pressing a single sheet of steel plate (metal plate).
Specifically, one end side of one steel plate material is wound into a cylindrical and closed shape to form the first tube portion 14, and the other end side is subjected to burring to form the second tube portion 16. Is formed.

FIGS. 6 to 8 specifically show the procedure for manufacturing the bracket fitting 12 made of a steel plate material.
First, as shown in FIG. 6, a blank plate (outside punching process) is performed on a single material plate 50, and a steel plate for a single metal bracket forming a flat plate shape in which the bracket fitting 12 is developed. A material 52 is obtained.

Then, as shown in FIG. 7 (I), the portion 14A on one end side of the flat steel plate material 52 is wound into a cylindrical shape (bending) to form the first tube portion 14.
At this time, the portion 14A on one end side is wound into a cylindrical shape until the end 14A-1 in FIG. 7 (I) contacts the connecting portion 18 in FIG. 1, that is, the start end of the first tube portion 14.
Note that the end 14A-1 brought into contact with the connecting portion 12 may be welded according to the strength required if necessary thereafter as shown in FIG.

  In addition to forming the first tube portion 14 by winding as described above, a circular hole 54 is punched in the other end side of the steel plate material 52 as shown in FIG. A burring process is performed at the formation location of the second cylindrical portion 16 to form the second cylindrical portion 16.

  As described above, as shown in FIG. 5, the first tube portion 14 is disposed on one end side, the second tube portion 16 is disposed on the other end side, and the first tube portion 14 and the second tube portion are interposed therebetween. The bracket metal fitting 12 provided with the plate-shaped connection part 18 which connects 16 is obtained.

  Then, the first rubber bush 22 made of a small bush is assembled to the first cylindrical portion 14 of the bracket fitting 12 manufactured in this way by press-fitting on the outer peripheral surface of the rubber elastic body 28, and the second cylindrical portion 16 is The torque rod 10 shown in FIG. 1 is obtained by press-fitting and assembling the second rubber bush 24 composed of the bush in the metal sleeve 36.

  According to the present embodiment as described above, the bracket metal fitting 12 having the first cylindrical portion 14 on one end side and the second cylindrical portion 16 on the other end side facing each other in the orthogonal direction is formed from a single steel plate material 52. Since the bracket metal fitting 12 can be formed from a single steel plate material 52 without assembling a plurality of parts, the bracket metal fitting 12 can be manufactured at a lower cost than conventional ones. It becomes.

  Further, by forming the first cylindrical portion 14 on one end side by winding the steel plate material 52 and forming the second cylindrical portion 16 on the other end side by burring, a pair of cylindrical portions facing each other in a perpendicular direction can be obtained. It can be easily formed from one steel plate material 52.

  In the present embodiment, the first tube portion 14 is formed with a small diameter, the second tube portion 16 is formed with a large diameter, and a small bush having a small diameter is press-fitted into the first tube portion 14 as a first rubber bush 22, A large bush having a large diameter is press-fitted into the second cylindrical portion 16 as a second rubber bush 24, thereby constituting the entire torque rod 10.

  In this case, since the second cylindrical portion 16 for the second bush 24 has a large diameter, that is, the diameter of the hole 54 provided in the steel plate material 52 before burring is large, the hole When the portion around 54 is bent and formed into a cylindrical shape, this can be performed with a relatively weak force. Therefore, burring for forming the second cylindrical portion 16 can be easily performed with good formability.

  On the other hand, for the first cylindrical portion 14 for the small bush, since the diameter of the hole 54 provided in the steel plate material 52 before burring is small when it is formed by burring, a desired strength is provided particularly to the bracket fitting. When the plate thickness is increased so as to have a strong force, a strong force is required to form the first tube portion 14 by burring, and it is difficult to form the first tube portion 14 with good formability by burring. It is.

  However, according to this embodiment, since the first cylindrical portion 14 having a small diameter is formed by winding, the first cylindrical portion 14 can be formed even if the steel plate material 52 is thick. It can be formed easily and satisfactorily.

  In this embodiment, the first rubber bush 22 composed of a small bush is also bonded to a rigid inner cylinder 26 and vulcanized and bonded around the inner cylinder 26 so as to have a solid structure without an axially penetrating portion. The rubber elastic body 28 is directly press-fitted into the first cylinder portion 14, while the second rubber bush 24 made of a large bush is added to the rigid inner cylinder 32 and the periphery thereof. A rubber elastic body 34 having axially penetrating straight portions 38 and 40 bonded to each other and a metal sleeve 36 fixed to the outer peripheral surface of the rubber elastic body 34 by vulcanization bonding. The metal sleeve 36 is press-fitted into the second cylindrical portion 16, so that the axial length of the second cylindrical portion 16 formed by burring is the same as that of the second rubber bush 24. Axial length, specifically metal Even shorter than the axial length of the rib 36 can hold the second rubber bushing 24 at the first cylindrical portion 14 without hindrance to the press-fitted state.

  On the other hand, the first cylinder portion 14 which does not have a metal sleeve and directly press-fits and holds the rubber elastic body 28 is formed by winding, so that the first cylinder is formed by burring. Compared to the case where the portion 14 is formed, the first cylindrical portion 14 can be formed with a sufficient axial length corresponding to the axial length of the first rubber bush 22, that is, the rubber elastic body 28. Also in the cylinder part 14, the 1st rubber bush 22 can be hold | maintained in a press-fit fitting state favorably.

  In the manufacturing method of the present embodiment, not only the second cylindrical portion 16 formed by burring but also the first cylindrical portion 14 formed by winding is shaped as a cylindrical portion before the rubber bushing is press-fitted. The assembly of the torque rod 10 can be completed by press-fitting a rubber bush (first rubber bush 22) therein.

  That is, after the first rubber bush 22 is press-fitted, it is not necessary to weld and join the wound portions, so that the rubber elastic body of the rubber bush already assembled by welding at that time is deteriorated by the heat effect. There is no fear that the set characteristics required for the first rubber bush 22 can be satisfactorily exhibited after assembly.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, in the above-described embodiment, the first bush 22 made of a small bush is normally a solid structure in which the rubber elastic body does not have a straight portion penetrating in the axial direction. It is also possible to use a shape having a straight through portion, or a first bush 22 made of a small bush having a metal sleeve fixed to the outer peripheral surface of the rubber elastic body. The present invention can be configured in various forms without departing from the gist of the present invention, for example, the bracket 12 can be made of a metal other than a steel plate.

It is a perspective view of the torque rod which is one Embodiment of this invention. FIG. 2 is a plan sectional view of the torque rod of FIG. 1. It is side surface sectional drawing of the torque rod of FIG. It is a figure shown in the state before the assembly | attachment of the 1st rubber bush and the 2nd rubber bush in the embodiment. It is a single-piece figure of the bracket metal fitting in the embodiment. It is a figure which shows 1 process of the manufacturing method of the torque rod of this invention. It is explanatory drawing of the process following FIG. It is explanatory drawing of the process following FIG. It is a figure which shows an example of the conventional torque rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Torque rod 12 Bracket metal fitting 14 1st cylinder part 16 2nd cylinder part 18 Connection part 22 1st rubber bush 24 2nd rubber bush 26,32 Inner cylinder 28,34 Rubber elastic body 36 Metal sleeve

Claims (4)

The first cylindrical portion of the bracket fitting formed by connecting the first cylindrical portion on one end side and the second cylindrical portion provided on the other end side in a direction orthogonal to the first cylindrical portion is connected to the first cylindrical portion. In the axially orthogonal type torque rod, which is formed by pressing and assembling the rubber bushes into the second cylindrical portion, respectively, and interposed between the engine side and the body side of the vehicle,
One end of a single flat metal plate is wound into a cylindrical shape and closed to form the first cylindrical portion with the axial direction parallel to the plate surface, and the metal plate The other cylinder side is subjected to burring to form the second cylinder part whose axial direction is orthogonal to the plate surface, the first cylinder part, the second cylinder part, and the first and second cylinder parts. The bracket metal fitting is constituted by a plate-like connecting portion between the first cylindrical portion and the first rubber bush is assembled to the first cylindrical portion, and the second rubber bush is assembled to the second cylindrical portion by press fitting. Torque rod characterized by   2. The first cylindrical portion according to claim 1, wherein the first cylindrical portion is formed with a small diameter and the second cylindrical portion is formed with a large diameter, and a small rubber bush having a small diameter is press-fitted into the first cylindrical portion as the first rubber bush. A torque rod characterized in that a large rubber bush having a large diameter is press-fitted as the second rubber bush into the second cylindrical portion.   3. The first rubber bushing according to claim 2, wherein the first rubber bush has a rigid inner cylinder and a rubber elastic body having a solid structure that is vulcanized and bonded around the inner cylinder and does not have a straight portion penetrating in the axial direction. The rubber elastic body is directly press-fitted into the first cylinder portion on the outer peripheral surface, and the second rubber bush is vulcanized and bonded to the rigid inner cylinder and around the inner cylinder in the axial direction. A rubber elastic body having a straight through portion and a metal sleeve fixed to the outer peripheral surface of the rubber elastic body by vulcanization adhesion are press-fitted into the second cylindrical portion in the metal sleeve. Torque rod characterized by that. The first cylindrical portion of the bracket fitting formed by connecting the first cylindrical portion on one end side and the second cylindrical portion provided on the other end side in a direction orthogonal to the first cylindrical portion is connected to the first cylindrical portion. A method of manufacturing an orthogonal shaft type torque rod comprising a rubber bush and a second rubber bush that is press-fitted into the second cylindrical portion and assembled between the rubber bush and the engine side and body side of the vehicle. ,
One end of a single flat metal plate is wound into a cylindrical shape and closed to form the first cylindrical portion with the axial direction parallel to the plate surface, and the metal plate The other cylinder side is subjected to burring to form the second cylinder part whose axial direction is perpendicular to the plate surface, the first cylinder part, the second cylinder part, and the first and second cylinder parts. The bracket fitting is constituted by a plate-like connecting portion between the first and second rubber bushes, and then the first rubber bush is assembled to the first cylindrical portion and the second rubber bush is assembled to the second cylindrical portion by press-fitting. A method of manufacturing an axially orthogonal torque rod, comprising a torque rod.

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