JPH10274282A - Manufacture of vibration control rubber bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a vibration control rubber bush which is arranged in a connection part of a suspension arm and a car body and has unsymmetrical characteristics in the axial direction in which the rigidity is low when the suspension arm is relatively displaced backward and the rigidity is high when it is relatively displaced forward in the reverse direction simply. SOLUTION: After an outer cylindrical metal fitting 20, an inner cylindrical metal fitting 22, and a rubber elastic body 24 provided between them are integrally vulcanized and bonded, an outer peripheral part of a stopper plate 28 is caulked and fixed on an end part in the axial direction of the outer cylindrical metal fitting 20 in a condition in which the stopper plate 28 is brought into contact with an end face on one side in the axial direction of the rubber elastic body 24 in such a manner that it is not bonded. On the other hand, an end face on the other side in the axial direction of the rubber elastic body 24 is released, and then restriction machining by which a diameter of the outer cylindrical metal fitting 20 is shrunk in this condition is done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a vibration-proof rubber bush suitable for use in a connection between a suspension arm of a vehicle and a vehicle body.

[0002]

2. Description of the Related Art In a suspension system for an automobile, a connecting portion between a suspension arm and a vehicle body absorbs vibration from a road surface, that is, a wheel, while securing a swinging motion of the suspension arm. BACKGROUND ART In order to suppress transmission of vibration to a vehicle body, an anti-vibration rubber bush is interposed.

FIG. 9 shows an example of an anti-vibration rubber bush provided at a connection between the suspension arm and the vehicle body. In FIG. 1A, reference numeral 200 denotes a suspension arm, and reference numeral 202 denotes a wheel. Suspension arm 200
Has a pair of cylindrical portions 20 in front and rear on the connection side with the vehicle body.
4 is formed therein, and before and after the vibration isolating rubber bush 2
06, 208 are fitted and fixed, and the suspension arm 200 is
Is swingably connected to the vehicle body side.

Here, the rear vibration-proof rubber bush 208 is
As shown in FIG. 7B, the outer cylindrical member 210 and the inner cylindrical member 212 are fitted to each other, and the outer peripheral surface and the inner peripheral surface are bonded to the outer cylindrical member 210 and the inner cylindrical member 212, respectively. And a fixed annular rubber elastic body 214.

[0005] The vibration-proof rubber bush 208 secures the swinging motion of the suspension arm 200 by the elastic deformation of the rubber elastic body 214 in the torsional direction, that is, the elastic deformation in the rotation direction, while elastically deforming in the perpendicular direction to the axis and in the axial direction. Thus, transmission of vibration from the suspension arm 200 to the vehicle body is suppressed.

By the way, in the case of the vibration-proof rubber bush 208, the load-deflection characteristic is substantially linear, that is, substantially uniform as shown in FIG. 10 throughout the forward elastic deformation and the backward elastic deformation. Therefore, for example, when the vehicle is running over a protrusion from the road surface, the wheel 202
And the suspension arm 200, that is, the outer cylinder fitting 21
0 increases the rigidity at the time of relative displacement with respect to the vehicle body, that is, the inner cylinder fitting 212, to improve the ride comfort, while increasing the rigidity at the time of the relative displacement in the reverse direction (forward) to improve steering stability. There is a problem that it is not possible to improve the performance.

[0007]

Means for Solving the Problems The present invention has been devised to solve such problems. According to the first aspect of the present invention, there is provided a method of manufacturing a vibration-proof rubber bush, wherein (a) an outer cylinder, (b) an inner cylinder, and (c) a rubber elastic body interposed therebetween. After the vulcanization bonding, the outer peripheral portion of the stopper plate is caulked to the axial end portion of the outer cylinder while the stopper plate is in non-adhesive contact with one axial end surface of the rubber elastic body. While the other end face in the axial direction of the rubber elastic body is released, and then, in this state, a drawing process is performed to reduce the diameter of the outer cylinder.

According to a second aspect of the present invention, in the method for manufacturing a vibration-proof rubber bush according to the first aspect, a stopper rubber is bonded and fixed to a surface of the stopper plate opposite to the rubber elastic body.

[0009]

As described above, according to the present invention, the outer and inner cylindrical fittings and the rubber elastic body between them are first integrally vulcanized and adhered, and the rubber elastic body in the axial direction. The stopper plate is brought into contact with one end surface of the outer plate, and in this state, the outer peripheral portion of the stopper plate is fixed to one end in the axial direction of the outer tube by caulking, and then the outer tube is drawn in the diameter reducing direction. By manufacturing the anti-vibration rubber bush according to the present invention, it is possible to increase the rigidity in the axial direction and one direction with respect to the anti-vibration rubber bush, and to reduce the rigidity in the reverse direction.

Specifically, when the outer cylinder is relatively displaced in the axial direction toward the stopper plate, the stopper plate moves integrally with the outer cylinder and separates from the axial end surface of the rubber elastic body. In that case, the rubber elastic body can be easily sheared elastically deformed in the axial direction and the rigidity decreases,
When the outer cylinder is relatively displaced in the opposite direction, the stopper plate is in contact with the axial end surface of the rubber elastic body and strongly presses the same in the same direction, so that the elastic deformation resistance of the rubber elastic body increases. Rigidity increases.

According to the manufacturing method of the present invention, the rubber elastic body can be pre-compressed in the axial direction at the same time that the drawing process is performed to reduce the diameter of the outer cylinder. When the outer cylinder is subjected to drawing in the diameter reducing direction, the rubber elastic body sandwiched in the direction perpendicular to the axis by the outer cylinder and the inner cylinder is compressed in the same direction. Trying to escape,
At that time, the stopper plate is fixed to the outer cylindrical fitting in an abutting state on the axial end surface of the rubber elastic body, so that the rubber elastic body cannot sufficiently escape in the axial direction due to the blocking action of the stopper plate. As a result, the rubber elastic body is pre-compressed in the axial direction.

The manufacturing method according to the present invention is characterized in that after the stopper plate is first caulked and fixed, the outer metal fitting is subjected to drawing. As described above, it is possible to pre-compress the rubber elastic body in the axial direction by the action of the stopper plate as described above.

However, it is also conceivable that first, after the outer cylindrical metal member is drawn in the diameter reducing direction, the stopper plate is caulked so as to be in contact with the axial end surface of the rubber elastic body. However, in this case, the stopper plate is caulked in a state where the axial end face of the rubber elastic body is bulged in the same direction due to the drawing process of the outer cylindrical metal fitting. The end face must be pressed down to the shape and position before drawing by the stopper plate, and caulking must be performed while maintaining the state, and the accuracy of the mounting position of the stopper plate is likely to be incorrect and the caulking itself Is difficult to perform, resulting in a problem of poor workability.

However, in the case of the manufacturing method according to the first aspect, since the drawing process of the outer cylinder is performed after the stopper plate is caulked and fixed, there is an advantage that such inconvenience does not occur.

According to a second aspect of the present invention, the above method is applied when the stopper rubber is bonded and fixed to the surface of the stopper plate opposite to the rubber elastic body. The effect is particularly great when the method is applied.

That is, in the case where the stopper plate has such a rubber stopper, if the outer cylinder is first drawn and then the stopper plate is caulked and fixed, a force is applied to the stopper rubber to push the stopper plate. The axial end face of the rubber elastic body swelled by the drawing process must be pressed by the stopper plate, and caulking must be performed under the pressed state.

In this case, the stopper rubber is crushed and the shape and dimensional accuracy of the stopper rubber are deviated. However, according to the manufacturing method of the present invention, the stopper plate is first caulked and fixed, and then the outer metal fitting is drawn. In this case, there is no need to apply any force to the stopper rubber of the stopper plate, and therefore, there is no inconvenience such as the stopper rubber being crushed by the applied force.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; In FIG. 1A, reference numeral 10 denotes a suspension arm in a suspension system of an automobile, and reference numeral 12 denotes wheels. In FIG. 1, the upper side is shown as the front of the vehicle. The suspension arm 10 is integrally formed with one cylindrical portion 14 at each of the front and rear sides.

In FIG. 1B, reference numeral 16 denotes an anti-vibration rubber bush obtained by the manufacturing method of this embodiment.
0, is press-fitted and fixed to each of the cylindrical portions 14, and is interposed between the suspension arm 10 and the vehicle body side, thereby connecting the suspension arm 10 and the vehicle body side.

FIG. 1B shows the vibration-isolating rubber bush 16 mounted on the suspension arm 10. In this figure, reference numeral 20 denotes an outer cylindrical member of the vibration-isolating rubber bush 16, reference numeral 22 denotes an inner cylindrical member, and reference numeral 24 denotes these outer cylindrical members 2.
It is an annular rubber elastic body interposed between 0 and the inner cylinder fitting 22. The rubber elastic body 24 is integrally vulcanized and bonded to each of the outer cylinder 20 and the inner cylinder 22 on the outer peripheral surface and the inner peripheral surface. Note that an annular gap 26 is formed between the outer cylinder fitting 20 and the substantially upper half of the rubber elastic body 24 in the figure.

Reference numeral 28 denotes a metal annular stopper plate which is in contact with the lower end surface of the rubber elastic body 24 in the drawing, that is, one end surface in the axial direction, and whose outer peripheral portion has an outer cylindrical metal fitting 20. Is caulked and fixed by a caulking portion 30 at the axial end. The stopper plate 28 is brought into contact with the axial end surface of the rubber elastic body 24 in a non-adhered state, and pre-compresses the rubber elastic body 24 in the axial direction.

A stopper rubber 32 is provided on the rear surface of the stopper plate 28, that is, on the surface opposite to the rubber elastic body 24.
Are adhesively fixed. Here, the stopper rubber 32 is formed in an arc shape on the upper side and the lower side as shown in FIG. Here, the upper stopper rubber 32A has a central angle θ _1.
The stopper rubber 32B on the lower side is formed in an arc shape having a center angle θ ₂ (90 ° in this example).

The vibration-isolating rubber bush 16 is placed in a state where the stopper rubbers 32A and 32B are positioned vertically, that is, the line connecting the circumferential centers of the stopper rubbers 32A and 32B is correctly oriented in the vertical direction. 10 is attached.

Next, a method of manufacturing the anti-vibration rubber bush 16 of this embodiment will be specifically described with reference to FIGS. First, as shown in FIG. 5 (I), the outer cylindrical member 20, the inner cylindrical member 22, and the rubber elastic body 24 are integrally vulcanized and bonded. At this time, as shown in FIG. 3 (B), a large diameter portion 34 and a stepped portion 36 are formed at the axial end of the outer tube fitting 20.

Next, as shown in FIG. 5 (II), a stopper rubber 32 is set in advance in a state in which an intermediate product 37 composed of the outer cylinder 20, the inner cylinder 22 and the rubber elastic body 24 is set in the receiving mold 38. The vulcanized adhesively attached stopper plate 28,
The surface opposite to the stopper rubber 32 is the rubber elastic body 24.
Is set to a state where it comes into contact with the axial end face of.

Next, as shown in FIG. 6 (III), the large-diameter portion 34 at the axial end of the outer cylindrical fitting 20 is turned inward and over the entire circumference by a pressing die (primary pressing die) 40. And bend it. In addition, this primary bending may be performed by pressing in the axial direction by the pressing die 40,
Alternatively, the bending process can be performed while rotating the roll die in the circumferential direction.

Subsequently, as shown in FIG. 6 (IV), the semi-bent portion 44 is bent by the pressing die (secondary pressing die) 42 until it comes into close contact with the stopper plate 28. And fix it.

Next, as shown in FIG. 7 (V), the outer metal fitting 20 is subjected to drawing using a drawing die 46,
The outer tube fitting 20 is reduced in diameter. Normally, the rubber elastic body 2
4 is compressed in the direction perpendicular to the axis, and tends to expand and deform in the axial direction as shown in FIG. However, in this manufacturing example, since the stopper plate 28 is caulked and fixed to the axial end surface of the rubber elastic body 24 in advance, the rubber elastic body 24 cannot freely swell and deform in the axial direction. In a pre-compressed state.

FIG. 3A shows the vibration-proof rubber bush 16 thus obtained in a state before being pressed into the suspension arm 10.

As shown in the load-deflection diagram of FIG. 4, the vibration-proof rubber bush 16 obtained by the above-described manufacturing method has the outer cylinder 20 together with the suspension arm 10 and the wheel 12 and the inner cylinder 22, that is, the vehicle body. When the vehicle 12 is running, the rigidity when the vehicle is relatively displaced rearward is reduced, and when the vehicle 12 travels over a protrusion on a road surface, the impact is transmitted to the vehicle body via the vehicle wheels 12 in a favorable manner.

On the other hand, the rigidity in the opposite direction, that is, when the outer cylindrical member 20 is to be displaced forward with respect to the inner cylindrical member 22, that is, the vehicle body together with the suspension arm 10 and the wheels 12, is excellent in steering stability. Nature is secured.

More specifically, when the outer cylinder 20 is relatively displaced toward the rear of the vehicle, the stopper plate 28 moves integrally with the outer cylinder 20 and separates from the axial end face of the rubber elastic body 24. While the rubber elastic body 24 can be easily sheared and elastically deformed in the axial direction to reduce rigidity, the outer cylindrical metal fitting 2
When 0 is relatively displaced in the opposite direction, the stopper plate 2
8 comes into contact with the axial end surface of the rubber elastic body 24 and strongly presses the same in the same direction, so that the elastic deformation resistance of the rubber elastic body 24 increases and the rigidity increases.

In the manufacturing method of the present embodiment, first, the stopper plate 28 is caulked and fixed in a state in which the stopper plate 28 is brought into contact with the axial end surface of the rubber elastic body 24, and then the outer cylindrical metal member 20 is subjected to drawing in the diameter reducing direction. Therefore, the rubber elastic body 24 can be pre-compressed in the axial direction by the action of the stopper plate 28 simultaneously with the drawing process.

On the other hand, when the stopper plate 28 is caulked and fixed to the axial end of the outer cylinder 20, the rubber elastic body 24 is in a state before drawing, and the axial end face is shown in FIG.
In the case where the stopper plate 28 is not swollen and deformed in the axial direction as shown in FIG. So that the stopper plate 2
When performing the caulking and fixing of 8, it is necessary to press back the axial end face of the rubber elastic body 24 that has expanded and deformed in the axial direction, that is, to caulk and fix the stopper plate 28 while strongly pressing the rubber elastic body 24. And caulking can be performed easily.

At this time, a high positional accuracy of the stopper plate 28 can be ensured, and at the same time, since it is not necessary to apply a strong pressing force to the stopper rubber 32, the stopper rubber 32 is crushed by the pressing force. Also, there is no inconvenience that the shape and dimensional accuracy are deformed due to deformation.

If the shape and the dimensional accuracy of the stopper rubber 32 are deviated, the vibration isolating rubber bush 16 cannot be pressed into the cylindrical portion 14 of the suspension arm 10 using a predetermined jig. However, according to the manufacturing method of the present embodiment, since the shape and dimensions of the stopper rubber 32 are not changed, the vibration-proof rubber bush 16 is press-fitted and fixed to the suspension arm 10. It can be performed smoothly and well.

Although the embodiment of the present invention has been described in detail, this is merely an example, and the present invention can be implemented in variously modified forms without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a vibration-isolating rubber bush obtained according to an embodiment of the present invention, together with a suspension arm.

FIG. 2 is a bottom sectional view of the vibration-isolating rubber bush in FIG.

3 is a perspective view showing the vibration-proof rubber bush of FIG. 1 in a completed state and in a state in which the rubber bush is being completed.

FIG. 4 is a view showing a load-deflection characteristic of the vibration-proof rubber bush of FIG. 1;

FIG. 5 is an explanatory view of a main part step of one embodiment of the present invention for manufacturing the vibration-proof rubber bush of FIG. 1;

FIG. 6 is an explanatory diagram of main steps following the method in FIG. 5 of the embodiment method.

FIG. 7 is an explanatory view of a main part step of the method according to the embodiment, following FIG. 6;

FIG. 8 is a comparative example diagram shown as a comparative example for explaining advantages of the method of the example.

FIG. 9 is a diagram showing a vibration-isolating rubber bush obtained by a conventional manufacturing method together with a suspension arm.

FIG. 10 is a view showing a load-deflection characteristic of the vibration isolating rubber bush of FIG. 9;

[Explanation of symbols]

 16 Vibration-proof rubber bush 20 Outer tube fitting 22 Inner tube fitting 24 Rubber elastic body 28 Stopper plate 30 Caulking portion 32 Stopper rubber 34 Large diameter portion 40 Pressing type (primary pressing type) 42 Pressing type (secondary pressing type) 46 Drawing type

Claims (2)

[Claims] 1. An outer cylinder fitting, and (b) an inner cylinder fitting.
(C) After integrally vulcanizing and bonding the rubber elastic body interposed therebetween, the stopper plate is brought into contact with one end face in the axial direction of the rubber elastic body in a non-bonding state. The outer peripheral portion of the stopper plate is fixed by caulking to the axial end portion of the outer cylindrical member, while the other end surface in the axial direction of the rubber elastic body is released, and then the outer cylindrical member is shrunk in that state. A method for manufacturing a vibration-proof rubber bush, characterized by applying a drawing process to reduce the diameter. 2. The method for manufacturing a vibration-proof rubber bush according to claim 1, wherein a stopper rubber is bonded and fixed to a surface of the stopper plate opposite to the rubber elastic body.