JPS63270913A - Connecting rod with rubber bush - Google Patents

Abstract

PURPOSE:To reduce the weight of the title connecting rod, by holding a mounting metal fitting integrated with a rubber bush at the edge along the internal circumference of a cylindrical portion and not positioning a mounting metal fitting along the entire circumference of an axle metal fitting. CONSTITUTION:A rubber bush 22 arranged in the large diameter cylindrical portion 14 of a connecting rod 10 is formed in such a connecting structure as integrating a cylindrical metal fitting 18 and mounting metal fittings 26, 26 with a rubber elastic body 28. In other words, each of mounting metal fittings 26, 26 is composed of a circular arc style metal plate formed with the nearly same curvature as the internal circumference surface of the large diameter cylindrical portion 14 of the connecting rod 10. Therefore, since those mounting metal fittings 26, 26 do not surround the circumferance of the cylindrical metal fitting 18, and positioned across the preset distance in the circumference direction, the weight of the connecting rod can be reduced by omission of the mounting metal fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a connecting rod with a rubber bushing that can be suitably used, for example, as a connecting rod or suspension rod for regulating excessive displacement of an engine with respect to a car body in an automobile, and particularly relates to a connecting rod with a rubber bushing. The present invention also relates to a connecting rod made of synthetic resin and having a rubber bushing at at least one end, which can effectively simplify the manufacturing process.

(Prior art and its problems) Conventionally, in horizontally mounted automobile engines, an intervening device has been installed between the engine and the vehicle body in order to restrict excessive displacement of the engine relative to the vehicle body due to inertia force when the vehicle is started or braked. In general, connecting rods that are connected to the vehicle, or various links and rods in automobile suspensions, are designed to prevent vibrations from the engine from being transmitted to the vehicle body.
Alternatively, in order to ensure steering stability and ride comfort, a cylindrical rubber bush is incorporated in one or both of the ends, and the rubber bush is connected to a predetermined mounting member via the rubber bush. A connecting rod is used.

By the way, in a connecting loft equipped with such a rubber bush at the end, there is usually a rubber elastic body between the shaft fitting and the thin cylindrical mounting fitting arranged so as to surround the shaft fitting. A rubber bushing is formed by vulcanizing and adhering the rubber bushing and drawing it through the mounting bracket, and the rubber bushing is press-fitted into a cylindrical part provided at the end of a separately formed metal rod. The structure is held in the cylindrical part by absorbing the tensile force caused by the contraction of the rubber during vulcanization in the rubber bushing by press-fitting or drawing. The reliability of joining the body to the mounting bracket or rod is improved.

However, connecting rods with this type of structure involve complicated processes such as vulcanization adhesion of rubber, drawing and press-fitting of mounting fittings, which leads to poor manufacturability and high manufacturing costs. It had an inherent problem.

On the other hand, in recent years, it has been considered to convert such connecting rods to resin-made rods in order to reduce the weight of vehicles and improve corrosion resistance. By making the rods made of resin in this manner, a vibration suppressing effect can be expected due to the vibration damping properties of the resin.

However, when the rod is made of resin in this way, a rubber bushing equipped with a cylindrical mounting bracket is press-fitted into the cylindrical part, or after the rubber bushing is press-fitted, the cylindrical part is On the other hand, it is essentially necessary to avoid drawing from the viewpoint of the strength and characteristics of the resin.Therefore, when making such connecting rods from resin, the rods are simply made of synthetic resin material. This could never be achieved by doing so.

(Solution Means) Here, the present invention has been made against the background of the above-mentioned circumstances, and is characterized in that, in the above-mentioned connecting rod with a rubber bush, the present invention includes a shaft fitting, A rubber bush is integrally connected to a mounting bracket that is placed at a predetermined distance radially outward without surrounding the periphery using a rubber elastic body, and a rubber bush is attached to the end of a rod made of a synthetic resin material. By holding the mounting bracket of the rubber bushing at the inner circumferential edge of the cylindrical portion so as to be located within the cylindrical portion provided in the section,
The structure is such that the rod is disposed at at least one end of the rod.

(Effects of the Invention) In the connecting rod having the structure according to the present invention, since the mounting fittings on the rubber bushing are not located over the entire circumference of the shaft fitting, its weight can be effectively reduced. In addition, even if the rubber elastic body is bonded to the mounting bracket by vulcanization adhesion at the time of molding, the tensile force due to contraction of the rubber elastic body during vulcanization may cause displacement of the mounting bracket. Therefore, the conventional drawing process of the rubber bushing after vulcanization can be omitted.

In addition, in the case of a connecting rod having such a structure, the rod is formed by press-fitting a predetermined resin material by an operation such as injection while the rubber bushing is set in the molding cavity of the rod. This makes it possible to simultaneously form the rod and assemble the rubber bushing into the rod with sufficient holding force.

Therefore, according to the present invention, it is possible to realize a connecting rod equipped with a synthetic resin rod, which can effectively reduce the weight of the product, simplify the manufacturing process, and reduce the manufacturing cost. It will become.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show an example of a connecting rod with a rubber bush according to the present invention, which is interposed between an engine unit and a vehicle body frame, and by connecting them, An example is shown in which the present invention is applied to a connecting rod that restricts excessive displacement.

, In these figures, 10 is a mouth/nod made of synthetic resin material, and a longitudinal rod body 12;
integrally provided at both ends of the rod main body 12;
A large diameter cylindrical portion 14 and a small diameter cylindrical portion 16 each having a cylindrical shape.
It is composed of.

Further, the large diameter cylindrical portion 14 and the small diameter cylindrical portion 1 of the rod 10
Inside the hollow parts of 6, there are respectively cylindrical metal fittings 1 as shaft fittings.
Rubber bushing 22.24 with 8.20 in its center
is held.

The connecting rod in this embodiment is attached to the rear part of the engine unit at the cylindrical fitting 18 of the rubber bush 22 of the 14 large diameter cylindrical portions, while the small diameter cylindrical portion 16 is attached to the rear part of the engine unit.
By attaching the cylindrical metal fitting 20 of the side rubber bushing 24 to the vehicle body frame, the engine unit is interposed between the engine unit and the vehicle body frame.

Here, the rubber bushing 24 disposed within the small-diameter cylindrical portion 16 of the rod 10 is integrally fixed to the cylindrical metal fitting 20 and the outer peripheral surface of the cylindrical metal fitting 20 by vulcanization adhesive or the like. The cylindrical rubber elastic body 30 is constructed of a cylindrical rubber elastic body 30, and is inserted into the hollow portion of the rod 10 so that the cylindrical fitting 20 is located approximately concentrically with the small diameter cylindrical portion 16 of the rod 10. It is held in a fitted state. In addition, at both ends of the rubber elastic body 30 in the axial direction, there are provided grooves extending outward in the radial direction that come into contact with the axial end surfaces of the small diameter cylindrical portion 16 to prevent the rubber elastic body 30 from being pulled out from the small diameter cylindrical portion 16. A flange portion 32 is provided.

On the other hand, the rubber bushing 22 disposed inside the large-diameter cylindrical portion 14 of the rod 10 includes a cylindrical fitting 18 and a mounting fitting 26 disposed radially outward of the cylindrical fitting 18 at a predetermined distance. .26 are integrally connected by a rubber elastic body 28.

More specifically, each of the mounting brackets 26 and 26 is constituted by an arcuate metal plate formed with approximately the same curvature as the inner circumferential surface of the large-diameter cylindrical portion 14 of the rod 10. The metal fittings 26, 26 are positioned at a predetermined distance in the circumferential direction without surrounding the cylindrical metal fitting 18. Further, the rubber elastic body 28 has a main body portion that is
two legs 34.3 extending radially outward from the tube fitting 18;
4, it is formed with a generally V-shaped cross section as a whole. While the central portion thereof is fixed to the outer circumferential surface of the cylindrical metal fitting 18, each leg portion 3
4 is fixed to the inner circumferential surface of the mounting bracket 26, and thereby the cylindrical metal fitting 18 and the mounting bracket 26, 26 are integrally connected by the rubber elastic body 28. be.

In addition, the rubber elastic body 28 has projecting radially outwards at a predetermined height from the center portions of the inner angles (included angles) and outer angles of the two legs 34 and 34 at the central portion in the axial direction. In this state, the stopper portions 36 and 38 are integrally provided.

In the rubber bushing 22 having such a structure, the stopper parts 36 and 38 provided on the rubber elastic body 28 respectively protrude in the axial direction of the rod IO, and the mounting fittings 26 and 26 are respectively attached to the rod 10. It is held in the hollow portion of the large diameter cylindrical portion 14 by being integrally fixed to the inner circumferential edge portion of the large diameter cylindrical portion 14 . As shown in FIG. 3, these mounting fittings 26 and 26 are each embedded within the large diameter cylindrical portion 14 of the rod 10, and have grooves at both ends in the circumferential direction. By extending the resin forming the large-diameter cylindrical portion 14 onto its inner peripheral surface, the fixing strength is improved.

Moreover, as is clear from the figure, such a rubber bush 22
When the rod 10 is attached to the rod 10, the stopper portions 36 and 38 are opposed to the inner peripheral surface of the large diameter cylindrical portion 14 of the rod 10 at a predetermined distance. , clearances 40 and 42 are provided between them.

That is, in the connecting rod of this embodiment having the above-described structure, when the load input in the longitudinal direction of the rod 10 is small, the clearances 40 and 42 can exhibit soft spring characteristics. On the other hand, if the load input in the longitudinal direction of the rod 10 is large, the stopper portions 36 to 38
By coming into contact with the inner peripheral surface of 4, hard spring characteristics can be exhibited, and therefore,
When the vehicle is running normally, it is possible to effectively prevent engine vibration from being transmitted to the vehicle body, and to prevent excessive displacement of the engine unit when starting or braking. It is.

Next, a specific example of the manufacturing procedure of the above-mentioned connecting rod with a rubber bush will be explained below.

That is, when manufacturing such a connecting rod, first,
A rubber elastic body 28 having a substantially ■-shaped cross section as described above;
The cylindrical rubber elastic bodies 30 are each vulcanized and molded from a predetermined rubber material. In , the cylindrical metal fittings 20 are each
They are fixed by vulcanization adhesion during molding of the rubber elastic body 28, 30, or by post-adhesion after molding, thereby forming the rubber bushings 22 and 24, respectively, having the above-described structure. It will be done.

Here, if the rubber bushing 22 is formed by vulcanizing and adhering the cylindrical fitting 18 and the mounting fittings 26, 26 with the rubber elastic body 28, the rubber elastic body 28 will shrink during vulcanization. However, since the fittings 26.26 are not continuous in the circumferential direction, the generation of tensile force due to such contraction can be effectively avoided by displacement of the fittings 26.26.

Next, such rubber bushings 22 and 24 are
The large-diameter cylindrical portion 14 and the small-diameter cylindrical portion 16 are set at predetermined positions in a molding cavity of a mold for molding the rod 10. In addition, in this rubber bushing 22, its mounting bracket 2
6. In the case of the rubber bushing 24, the outer circumferential surface of the rubber elastic body 30 constitutes the inner wall surface of the molding cavity in which the large-diameter cylindrical portion 14 and the small-diameter cylindrical portion 16 are respectively formed. becomes.

Thereafter, a predetermined resin material is press-fitted into the molding cavity formed by the mold by a normal injection operation or the like.

As the press-fitting resin material, any thermoplastic resin such as nylon or 7-cetal, or thermosetting resin such as epoxy or phenol can be used, and the press-fitting and molding method also depends on the resin used. Depending on the material, a normal injection molding method or a transfer molding method that falls within the scope of injection molding may be employed as appropriate.

In addition, in particular, thermoplastic resins and thermosetting resins to which glass fibers, carbon fibers, whiskers, etc. are added, or those resin materials combined with filament winding, etc. A reinforcing material-containing resin with improved strength will be suitably employed.

The resin material press-fitted into the molding cavity in this way forms the rod 10 within the cavity, but when forming the large diameter cylindrical portion 14,
The rubber bushing 22 is fixed to the outer circumferential surface of the mounting fitting 26.26 of the rubber bushing 22 disposed there, so that the rubber bushing 22 is held integrally at the inner circumferential edge portion of the large diameter cylindrical portion 14. It will become. On the other hand, the small diameter cylindrical portion 16 made of such resin material
When forming the rubber bush 7, the positive pressure causes a radially inward compressive force to act on the outer peripheral surface of the rubber bush 24 disposed there, and pre-compression is applied to the rubber bush 7. This allows the shoe 24 to be held within the small diameter cylindrical portion 16.

After the resin material is press-fitted and solidified/cured, the mold is opened and the molded body is taken out, as described above.
A large diameter cylindrical portion 14 and a small diameter cylindrical portion 1 formed at both ends thereof.
6, rubber bushings 22 and 24, respectively.
The desired connecting rod with a rubber bushing can be obtained.

Therefore, in a connecting rod with a rubber bush having such a structure, the large diameter cylindrical portion 1 formed at one end thereof is
Mounting metal fittings 26 for the rubber bushing 22 disposed within 4
．． 26 is not located around the entire circumference of the shaft fitting 18, its weight can be effectively reduced, and the adhesion to the rubber elastic body 28 is achieved by vulcanization adhesion during molding of the rubber elastic body 28. Even when the process is carried out in a vacuum cleaner, there is no need to carry out drawing as in the conventional method, so the manufacturing process can be effectively simplified.

In addition, in the connecting rod having such a structure, the rubber bushing 22 can be assembled to the rod 10 at the same time as the rod 10 is formed, with sufficient holding force, thereby further simplifying the manufacturing process. This simplification and associated reduction in manufacturing costs can be achieved extremely effectively.

Therefore, by adopting the above-described structure, a connecting rod having a rubber bushing 22 at one end whose spring characteristics in one direction in the radial direction changes depending on the applied load can be made of resin material. It goes without saying that compared to conventional metal rods, it is possible to effectively reduce the weight of the member and improve corrosion resistance.
Since vibration damping properties are improved by the elastic deformation of the resin, it is extremely advantageous in suppressing vibrations.

Next, FIGS. 4 and 5 show a connecting rod as another embodiment of the present invention.

Incidentally, the connecting rods in the following embodiments are all interposed between the engine unit and the vehicle body frame of the vehicle, as in the first embodiment, thereby preventing the engine unit from becoming excessively large. It regulates displacement,
And compared to the connecting rod in the first embodiment,
Since only the structure of the rubber bushing held in the large-diameter cylindrical portion 14 is different, members having the same structure as in the first embodiment are designated by the same reference numerals. Therefore, detailed explanation thereof will be omitted.

That is, in the connecting rod according to this embodiment, the rubber bushing 44 held in the hollow part of the large-diameter cylindrical part 14 provided at one end of the rod 10 is connected to the cylindrical fitting 18 and the diameter of the cylindrical fitting 18. Mounting metal fittings 46.46 arranged outwardly at a predetermined distance, and a rubber elastic body that is fixed to the cylindrical metal fitting 18 and the mounting metal fittings 46.46 to integrally connect them. 48.

More specifically, the rubber elastic body 48 has a main body portion formed by two leg portions 50 and 50 with a V-shaped cross section, and a cylindrical portion at the central portion. The mounting bracket 4 is fixed to the outer circumferential surface of the metal fitting 18, while the mounting bracket 4 is fixed at the tip of each leg 50.
6.

Here, in such mounting fittings 46.46,
Each is formed in a cylindrical shape, and the leg portion 50 of the rubber elastic body 48 extends approximately half the circumference of the outer peripheral surface thereof.
is fixed in place.

The rubber bushing 44 having such a structure is
The mounting bracket 46.46 is attached to the large diameter cylindrical portion 14 of the rod 10.
It is held by being fixed to the resin forming the large-diameter cylindrical portion 14 at the inner peripheral edge portion of the large-diameter cylindrical portion 14. In this embodiment, in particular, as shown in FIG. As shown in FIG.
It is being filled.

In addition, in this rubber bushing 44, a stopper part is not formed on the inner angle (included angle) side of the leg part 50. A protrusion 52 that protrudes radially inward is formed on the inner wall surface, and the contact of the rubber elastic body 48 with the protrusion 52 effectively restricts excessive displacement of the cylindrical fitting 18 with respect to the large diameter cylindrical portion 14. I'm starting to get it.

In addition, the connecting rod in this embodiment is manufactured by manufacturing the rod 10 according to the manufacturing method explained in the above embodiment.
Since the resin material can be easily manufactured by entering the hollow portion of the mounting fittings 46, 46 in the rubber bush 44 during molding, a detailed explanation thereof will be omitted.

Further, FIG. 6 shows yet another embodiment of the present invention.

That is, in the connecting rod according to this embodiment, the rubber bushing 54 held in the hollow part of the large-diameter cylindrical part 14 provided at one end of the rod 10 is connected to the cylindrical metal fitting 18 and the diameter of the cylindrical metal fitting 18. A cylindrical mounting fitting 56 arranged outwardly at a predetermined distance, and a rubber elastic body that is fixed to the cylindrical fitting 18 and the mounting fitting 56 to integrally connect them. 58.

More specifically, the main body portion of the rubber elastic body 58 is formed to have a fan-shaped cross-sectional shape having an arcuate outer circumferential surface having approximately the same curvature as the inner circumferential surface of the large diameter cylindrical portion 14 of the rod 10. , is fixed to the outer circumferential surface of the cylindrical fitting 18 at its center side, and fixed to the mounting fitting 56 over approximately half of its outer circumferential surface at the circumferentially central portion of the arcuate outer circumferential surface. There is.

The rubber bush 54 is attached to its mounting bracket 56.
is fixed to the rod body 12 side at the inner circumferential edge of the large diameter cylindrical portion 14, so that the arcuate outer circumferential surface of the rubber elastic body 48 is in contact with the inner circumferential surface of the large diameter cylindrical portion 14. , is held in the hollow part of the large diameter cylindrical part 14, and here, as shown in FIG. The resin forming the cylindrical portion 14 is infiltrated and filled.

In addition, in the rubber bushing 54 in this embodiment,
By providing a hole 60 that passes through the rubber elastic body 58 in the axial direction at the intermediate portion between the cylindrical fitting 18 and the mounting fitting 56, a soft spring can be formed when the load acting on the rod 10 in the axial direction is small. It is now possible to demonstrate its characteristics.

Therefore, even with the connecting rods in the second and third embodiments as described above, the above-mentioned effects such as weight reduction, simplification of the manufacturing process, and accompanying reduction in manufacturing costs are effectively achieved. Of course, the resin forming the large-diameter cylindrical portion 14 penetrates and fills the hollow interior of the mounting bracket 46 (56), so that
The strength with which the rubber bushing 44 (54) is held against the large-diameter cylindrical portion 14 can be effectively increased.

The embodiments of the connecting rod structured according to the present invention have been described in detail above, but these are literal examples, and the present invention should not be construed as being limited to such specific examples. do not have.

For example, in the connecting rod in the above embodiment, the rubber bushing having the structure according to the present invention was provided only on the side of the large-diameter cylindrical portion 14 formed at one end of the rod 10, but the rubber bushing was provided at both ends thereof. It is also possible to arrange a rubber bush having a structure according to the invention in the part.

In addition, in the above embodiment, the small diameter cylindrical portion 1 of the rod lO
Although the rubber bushing 24 was also provided on the 6 side, it is not necessary to provide such a rubber bushing 24, and furthermore, such a rubber bushing 24 can also be assembled by being press-fitted into the small diameter cylindrical part 16 after molding the rod 10. It is.

Furthermore, in the present invention, the structure of the rubber bushing, particularly the specific shapes of the rubber elastic body and the mounting bracket, are not limited in any way, and may be determined as appropriate depending on the characteristics required of the connecting rod. It should be understood that

In addition, in the above embodiment, the present invention is applied to a connecting rod that restricts excessive displacement of an engine unit in an automobile, but the present invention is also applicable to various types of automobile suspensions. arm,
It can also be suitably applied to rods and the like.

In addition, although not listed, the present invention can be implemented in embodiments with various changes, modifications, improvements, etc., based on the knowledge of those skilled in the art, and such embodiments are not limited to the present invention. It goes without saying that any of these are included within the scope of the present invention as long as they do not depart from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of a connecting rod with a rubber bushing having a structure according to the present invention, and FIG.
3 is a sectional view taken along line nn in FIG. 1, and FIG. 3 is a sectional view taken along line ■-■ in FIG. FIG. 4 is a plan view showing another embodiment of a connecting rod with a rubber bush having a structure according to the present invention, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4. Further, FIG. 6 is a plan view showing still another embodiment of a connecting rod with a rubber bush having a structure according to the present invention, and FIG. 7 is a sectional view taken along the line 1--2 in FIG. 6. 10: Rod 12: Rod body 14: Large diameter cylindrical portion 18; Cylindrical metal fittings 22.44, 54: Rubber bushings 26, -46.56: Mounting metal fittings 28.48. ss: Rubber elastic body ~

Claims (1)

[Claims] A shaft fitting and a mounting fitting arranged radially outward at a predetermined distance without surrounding the shaft fitting,
The mounting bracket for the rubber bushing is attached to the cylindrical part so that the rubber bushing, which is integrally connected with a rubber elastic body, is located in the cylindrical part provided at the end of the rod made of synthetic resin material. A connecting rod with a rubber bush, characterized in that the connecting rod is disposed at at least one end of the rod by being held at the inner peripheral edge of the rod.