JPH044331A - Prevention for slip-off of cushion rubber - Google Patents

Abstract

PURPOSE:To improve preventing force against the slip-off from an opponent member by forming a necessary gap between the divided opposed surfaces of a half-divided outer cylinder, and setting the inside radius of curvature of each divided outer cylinder so as to be slightly larger than the inside radius of curvature of the opponent member. CONSTITUTION:A cushion rubber M is press-fitted on an installation cylinder 5 at the edge part of the suspension member S of an automobile. The outer peripheries of the semicylindrical outer cylinders 2a and 2b are pressed toward the axis center, and an inside rubber 3 is com pressed in the direction for approaching the divided opposed surfaces until the outside diameter for the insertion into the installation cylinder 5 is generated, and in an elastic deformation state, the inside rubber 3 is inserted into the installation cylinder 5, and a pressing force is released. The press-fitted cushion rubber M possesses a large elastic force which is directed outward and with which the semicylindrical outer cylinders 2a and 2b tend to restoration- spread to the radius of curvature of the inside diameter which is large than that of the installation cylinder 5 from the compression shape through the elastic deformation, and since the inside rubber 3 always possesses the repulsive elastic force due to the compression applied from the outer periphery, the outer peripheries of the semicylindrical outer cylinders 2a and 2b are strongly pressed on the inner periphery of the installation cylinder 5 by the synergetic action of both the forces.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to automobile suspension members, etc. (7)
The present invention relates to a method for effectively preventing cushion rubber from slipping out of the other member when the cushion rubber is press-fitted into the other member.

(Prior Art) Conventionally, as cushion rubber for insulators and the like that are press-fitted into the body mount parts and ring bushings of suspension members and differential mount members of automobiles, for example, as shown in FIG. A rubber (3) is provided on the outside of the inner cylinder (1), and an outer cylinder (2)' made of metal or the like which is divided vertically into two in the axial direction is provided on the outside of the rubber (3), and is integrated by vulcanization of the rubber (3). The two-part outer cylinder (2)' part is inserted into the metal right circular mounting cylinder (5) welded to the end hole of the other member, in this case the suspension member. It is used by press-fitting, but
At this time, in order to prevent the attachment tube (5) from coming off, the left half of the outer tube (2)' is divided into two halves, forming a semi-cylindrical shape, as shown in FIGS. 6(a) and (+1). Part (2a)'
The outer radius of curvature (R2) of the left and right half parts (2b)' is set equal to the inner radius of curvature (R) of the mounting tube (5), and the left and right half parts (2a)' and (2b)' are Rubber (3) is placed in the space between the inner cylinder (1) and the outer cylinder (2)' with a gap (4) existing between the split facing faces, and is vulcanized and bonded to form the structure shown in Fig. 6 (a). The left and right halves (2) of the outer cylinder (2)' in the Y-axis direction
The length between the inner surfaces of a)' and (2b)' is the mounting tube (5)
The width α of the gap (4) is longer than the inner diameter A of the gap (4).

Cushion rubber (M)′ formed in this way
When press-fitting this into the mounting tube (5), Fig. 6 (a)
As shown in the figure, the left and right halves (2) of the outer cylinder (2)' are divided into two.
a)' and (2b)' are simultaneously pressed in the directions p, , and p2 shown in the figure to compress the inner rubber (3), and then insert the mounting tube (
5), but at this time, the repulsive force of the rubber (3) generated by the compression causes the left and right halves (2a
)' and (2b)' are attached to the mounting tube (
5) to prevent it from slipping out.

(Problems to be Solved by the Invention) However, in such a conventional cushion rubber (M)', as shown in FIG. The outer radius of curvature (R2) of (2b)' is equal to the inner radius of curvature (R) of the mounting tube (5), and like the mounting tube (5), it is made of metal and its outer surface The mounting tube (
5) The frictional force between the inner surface and the inner surface is not very large, and the force to prevent slipping out is solely provided by the repulsive elasticity of the rubber (3). When pounding and rebounding force is generated on a car while driving, as shown in Fig. 6 (a), lateral vibration due to alternating repetition of <p, , p2 in both directions and longitudinal vibration in the direction orthogonal to this are added. In this state, for example, when an external force Pl is applied to the inner cylinder (1), the frictional force generated between the outer surface of the left half outer cylinder (2a)' and the inner surface of the mounting cylinder (5) is reduced, and at the same time, the shaft When an external force in the direction is applied, the left half outer cylinder (2a)' slightly rises or falls within the mounting cylinder (5).

Conversely, when an external force R2 is applied to the inner cylinder (1), the right half outer cylinder (2b
)' rises or falls slightly.

When such a phenomenon is repeated, the entire cushion rubber (M)' naturally slides in the axial direction against the mating member (5) and eventually comes off, causing the rubber (
A problem arises in that the effect of preventing slippage due to the repulsion elasticity described in 3) is not effective.

Therefore, in order to prevent such inconvenience from occurring,
It may be possible to increase the spring constant of the cushion rubber (M)', especially in the axial direction and the direction perpendicular to the axis of the rubber (3), but if the spring constant is increased too much, the cushion rubber (M)'
It is impossible to increase the spring constant beyond the limit because this will reduce the original vibration-proofing performance, and in the end, it is often the case that the pull-out prevention effect is not achieved.

The present invention has been made in view of the above circumstances, and by comparing and considering the cushion rubber to be press-fitted into the mating member and the inner radius of curvature of the mating member, not only the repulsive elasticity of the rubber but also the outer cylinder itself are The purpose of this is to utilize the generated elastic force to further improve the ability to prevent the other member from slipping out.

(Means for Solving the Problem) The present invention to achieve the above object includes an inner cylinder and a vertically divided
In cushion rubber that is used by vulcanizing and adhering the inner cylinder and the outer cylinder with rubber interposed in the space between the divided outer cylinder and press-fitting into the mating member, between the divided opposing surfaces of the two divided outer cylinders. A required gap is provided between the outer cylinders, and the inner radius of curvature of each divided outer cylinder is set to be slightly larger than the inner radius of curvature of the mating member. It is characterized by a method of preventing the cushion rubber from slipping out from the opposing member by changing the radius of curvature and utilizing the elastic force of the outer cylinder.

(Function) The cushion rubber slip-off prevention method of the present invention as described above is based on the two-part outer cylinder of the cushion rubber in which rubber is interposed in the space between the inner cylinder and the vertically divided two-part outer cylinder. A required gap is provided between the facing faces of each divided outer cylinder, and the inner radius of curvature of each divided outer cylinder is set to be slightly larger than the inner radius of curvature of the mating member, so that when press-fitted into the mating member, the outer radius of curvature of the outer cylinder is changed to the inner radius of curvature of the mating member, and the elastic force of the outer cylinder is used to prevent it from slipping out from the mating member.Press-fitting into the mating member is done by inserting each half of the outer cylinder into two. This is possible by squeezing the outer periphery of the cylindrical body in the axial center direction and elastically deforming the inner rubber while compressing the inner rubber in the direction of bringing the split facing surfaces closer together until the outer diameter reaches an outer diameter that allows insertion into the mating member, and
Each press-fitted cylindrical outer cylinder always has a strong elastic force in the direction of expanding outward to restore the elastically deformed squeezed shape to a radius of curvature larger than that of the original mating member. However, since the inner rubber always has repulsive elasticity due to compression from the outer periphery, the synergistic effect of these two forces causes the outer periphery of the outer cylinder to be strongly pressed against the inner periphery of the other member, and there is a gap between them. The frictional force that resists slipping out is doubled, and this suppresses sliding such as rising and falling of the outer cylinder within the mating member, effectively preventing the cushion rubber from slipping out.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a top view showing one embodiment of the cushion rubber according to the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG.
This figure is a perspective view showing the direction in which the cushion rubber shown in FIG. 1 is press-fitted into the mating member.

In these figures, (M) is a cushion rubber used for anti-vibration support between an automobile suspension member (S) and the vehicle body, and is an insulator rubber as an elastic member that is integrally fixed to the inner cylinder (1) and the outside thereof. (3), and an outer cylinder (2) that is integrally fixed to the outside and divided into two parts with a required gap (4) in the axial direction, and this cushion rubber (M) is connected to the mating member, In this case, press fit the outer cylinder (2) into the metal right circular mounting cylinder (5) welded to the end hole of the suspension member (S), and
It is fixed to the vehicle body with a bolt (not shown) inserted through the inner cylinder (11) and used as a vibration isolator.

Forces and rotational moments in various directions including the axial direction and the direction perpendicular to the axis (radial direction) of the cushion rubber (M) are applied to the suspension member, etc., or these are transmitted to the vehicle body through the cushion rubber (M). .

In the above cushion rubber (M), the inner cylinder (1) and the outer cylinder (
2) means the inner diameter dimension (R) of the outer cylinder (2) by molding metal etc.
Except for -, it is manufactured in the same manner as the known cushion rubber as shown in FIGS. 1, 2 and 3.

The outer cylinder (2) of the cushion rubber (M), which is a main part of the present invention, is vertically divided into two halves, the left half (2a) and the right half (2b), both of which have an inner radius of curvature (R1). 1-3
As shown in the figure, it has a semi-cylindrical shape slightly larger than the inner radius of curvature (R) of the right circular mounting tube (5) at the end of the other member, that is, the suspension member (S) in this case, and has an appropriate wall thickness. Molded.

Furthermore, each of the semi-cylindrical outer cylinders (2a) and (2b) is
For example, the right circular mounting tube (5) has an inner radius of curvature of 35 mm.
If the inner diameter is 8+n and the inner diameter is 71.6, each semi-cylindrical outer cylinder (2
For example, the inner radius of curvature of a) and (2b) is 37.81
m, and in the cushion rubber (M) body completed by vulcanization adhesion of the rubber (3) disposed between the inner cylinder (11), the opposing dividing surfaces of each of the semi-cylindrical outer cylinders (2a) and (2b) 81 including the outer diameter in the direction perpendicular to the line connecting the , including the wall thickness.
．． It is set as large as 6mm. In this case, the wall thickness of each of the semi-cylindrical outer cylinders (2a) and (2b) is three fins, and the width of the gap (4) between the opposing dividing surfaces is approximately l Q *x. .

Therefore, the cushion rubber (M) formed as above
As shown in Fig. 3, the is press-fitted into the mounting tube (5) at the end of the suspension member (S) of the automobile in the direction of the arrow. Press the outer peripheries of (2a) and (2b) in the direction of the axial center to bend them, and then move them inward in the direction of bringing the divided facing surfaces closer together until the outer diameter reaches a diameter that allows insertion into the mounting tube (5). Rubber (
3) is compressed and elastically deformed and inserted into the mounting tube (5), and then the pressing force is released.The press-fitted cushion rubber (M) (2a) and (2b) always have a strong outward elastic force that prevents them from restoring and expanding from the elastically deformed compressed shape to the original radius of curvature with an inner diameter larger than that of the attachment tube (5). On the other hand, since the inner rubber (3) also has repulsive elasticity due to compression from the outer periphery, the synergistic effect of both of these forces works to reduce the outer periphery of each semi-cylindrical outer cylinder (2a), (2b). This strongly presses against the inner periphery of the mounting tube (5) and brings it into close contact, greatly increasing the frictional force between them that resists slipping out.

Incidentally, when the cushion rubber of the present invention was compared with the conventional cushion rubber in the installed state shown in FIG. 4, the results shown in FIG. 5 were obtained by comparing the pull-out load force at each deflection amount.

As is clear from the chart in FIG. 5 above, the cushion rubber slip-out prevention method according to the present invention has a deflection amount of 511 to 4011 at the pull-out load required for slip-out, compared to conventional cushion rubber. In all cases, double the pull-out load force is required, which confirms that the pull-out resistance force is doubled compared to the conventional product, making it more effective.

(Effects of the Invention) As detailed above, according to the cushion rubber slip-out prevention method of the present invention, rubber is interposed in the space between the inner cylinder and the outer cylinder divided into two vertically. In a cushion rubber that is used by vulcanizing and adhering a cylinder and an outer cylinder and press-fitting them into a mating member, a required gap is provided between the facing faces of the two divided outer cylinders, and the inner radius of curvature of each divided outer cylinder is set. The outside radius of curvature of the outer cylinder is set to be slightly larger than the inner radius of curvature of the other member, and when it is press-fitted into the other member, the outer radius of curvature of the outer cylinder changes to the inner radius of curvature of the other member, and the elastic force of the outer cylinder is used to make the other member Since this method prevents the cushion from slipping out, attaching it to the other member is easy by simply inserting the cushion rubber outer cylinder while compressing the inner rubber and pressing it from the outer periphery in the axial direction, leaving it bent. It can be press-fitted and installed.

Moreover, the cushion rubber after press-fitting functions not only to rebound elasticity of the rubber due to the compression mentioned above, but also to synergistically act on the strong elastic force of the outer cylinder itself in the compressed state to prevent it from expanding and returning to its original state, thereby preventing it from slipping out. It has become possible to obtain a large frictional force, and as a result, it has double the slip-out prevention force compared to conventional ones, and has the remarkable effect of reliably preventing the cushion rubber from slipping out from the other member. can be played.

[Brief explanation of drawings]

FIG. 1 is a top view showing one embodiment of the cushion rubber according to the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG.
The figure is a perspective view showing the direction in which the cushion rubber shown in Fig. 1 is press-fitted into the mating member, Fig. 4 is a sectional view showing the load state on the cushion rubber during the comparative experiment shown in Fig. 5, and Fig. 5 is the same as Fig. 4. Figure 6 (A) is a top view showing an example of the conventional cushion rubber, Figure 6 (0) is the same Figure (A) is a top view of the other member into which the glue/notion rubber is press-fitted. (M), (M)'...Cushion rubber, (S)・
...Suspension member (1)...Inner cylinder, (2), (2)'...Outer cylinder, (
2a), (2a)'...Semi-cylindrical outer cylinder on the left half, (
2b), (2b)'...Semi-cylindrical outer cylinder on the right half, (
3)...Rubber, (4)...Gap, (5)...Mating member (mounting tube).

Claims (1)

[Claims] 1. In the cushion rubber that is used by vulcanizing and adhering the inner cylinder and the outer cylinder with rubber interposed in the space between the inner cylinder and the outer cylinder divided into two vertically, and press-fitting into the mating member, the above-mentioned cushion rubber is used. 2
A required gap is provided between the opposing surfaces of the divided outer cylinders, and the inner radius of curvature of each divided outer cylinder is set to be slightly larger than the inner radius of curvature of the mating member, so that when press-fitted into the mating member, the outer cylinder A method for preventing cushion rubber from slipping out from the opponent member by changing the outer radius of curvature of the cushion rubber to the inner radius of curvature of the opponent member and utilizing the elastic force of the outer cylinder.