JPH08233030A - Coupling rod - Google Patents

Abstract

PURPOSE: To provide a coupling rod by which the cost reduction can be made and besides the vibration control property can also be improved easily. CONSTITUTION: A rod-shaped section 2 and tubular sections 3 are made integrally by resin. Furthermore, a mass member 6b for adjustment of mass is fixed to this rod-shaped section 2 or the tubular section 3, thus a dynamic damper where these constituent parts are mass bodies and an elastic body 5 is a spring is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin connecting rod used as a torque rod, a stabilizer link rod, a suspension rod, etc. of an automobile engine.

[0002]

2. Description of the Related Art Conventionally, in connecting rods such as torque rods, stabilizer link rods, and suspension rods, metal cylindrical portions are formed at both ends of a metal rod-shaped portion. It was constructed by press-fitting and fixing an anti-vibration bush on the side. As the anti-vibration bush, one in which a metal inner cylinder is disposed inside a metal outer cylinder, and the inner and outer cylinders are connected by an elastic body such as rubber is usually used.

In recent years, in response to demands for cost reduction of the device, resin connecting rods such as those disclosed in Japanese Utility Model Publication No. 50-3217 have been proposed. In this structure, a rod-shaped portion and tubular portions at both ends thereof are integrally made of a resin material, and the tubular portion is resin-molded so as to be integrated with a vibration-proof bush. In this case, the anti-vibration bush may have the outer cylinder omitted if necessary.

[0004]

By the way, in the conventional connecting rod, the rod-shaped portion and the cylindrical portion are designed and manufactured mainly from the viewpoint of strength, and the rod-shaped portion and the cylindrical portion are designed and manufactured depending on the size and the kind of metal material. The mass was also uniquely determined. Further, if the problem of strength is solved, a resin that can be reduced in cost is also used, and in this case, it is lighter than a metal material. Further, from the viewpoint of the transmissibility of vibration from the vibration source side to the vibrated side, the allowable displacement amount of the vibration source or the vibrated side member, and the durability of the elastic body, the spring constant of the elastic body in the vibration-proof bush is appropriately selected. There is.

On the other hand, in this connecting rod, when the elastic body is considered as a spring element and a damping element, and the rod-shaped portion including the cylindrical portion is considered as a mass body, it can be considered that the connecting rod functions as a dynamic damper. I can. Then, at this time, the vibration eigenvalue of the connecting rod is determined from the total mass of the portion of the connecting rod that sandwiches the two elastic bodies, that is, the rod-shaped portion, the cylindrical portion, and the like, and the spring constant of the two elastic bodies. .

Therefore, the conventional connecting rod does not consider the function as the above-mentioned dynamic damper, and there has been no attempt to improve the vibration damping property. The vibration eigenvalue is determined by the spring constant of the elastic body and the rod mass selected from the viewpoints of strength, durability, etc. Therefore, according to this vibration eigenvalue, there is a possibility that the vibration may be further amplified by resonance. there were. Further, in the case where the rod-shaped portion is made of resin, the mass of the rod-shaped portion is small, so that there is a problem that resonance of these vibration systems is promoted.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the cost so as to take advantage of the fact that it is made of resin, and it is also possible to easily improve the vibration damping characteristics. Intended to provide rods.

[0008]

According to a first aspect of the present invention, there is provided a connecting rod, a rod-shaped portion, tubular portions formed at both ends of the rod-shaped portion, and mounting members arranged in the respective tubular portions. A member and an elastic body interposed between the tubular portion and the mounting member, wherein the rod-shaped portion and the tubular portion are integrally molded with resin, and the rod-shaped portion or the tubular portion is provided. A mass member for mass adjustment is fixed to the shaped portion.

According to a second aspect of the present invention, there is provided a connecting rod, a rod-shaped portion, tubular portions formed at both ends of the rod-shaped portion, mounting members arranged in the respective tubular portions, and the tubular portion. The rod-shaped portion and the tubular portion are integrally molded with resin, and the rod-shaped portion or the tubular portion is rubber-shaped. A mass member for mass adjustment is fixed via an elastic body.

The operation of the invention according to claim 1 will be described below. According to the structure of the first aspect, the rod-shaped portion and the tubular portions at both ends thereof are integrally molded with resin, and the mass of the portion forming the space between the two elastic bodies is formed in the rod-shaped portion or the tubular portion. The mass member for adjusting is fixed. Therefore, the mass of the rod-shaped part is easily adjusted with a simple structure, and the natural frequency when the rod-shaped part and the cylindrical part are made to be a mass body for the specific vibration of the vibration isolation target to be reduced is easy. It is possible to tune to. Thus, the vibration energy of the vibration-damping target vibrates as the vibration energy of the vibration-damping target is resonated by the mass body constituted by the portion between the two elastic bodies with respect to the vibration of the vibration-damping target. Converted to energy and absorbed,
Therefore, the vibration damping property is improved.

The operation of the invention according to claim 2 will be described below. According to the structure of claim 2, the rod-shaped portion and the tubular portions at both ends thereof are integrally molded of resin, and the rod-shaped portion or the tubular portion has a desired natural vibration through the rubber elastic body. The mass member is fixed so as to have a number. Therefore, it is possible to easily tune the natural frequency of the mass member and the rubber-like elastic body with respect to the specific vibration of the vibration isolation target to be reduced. The mass member resonates with the rubber-like elastic body as a spring in response to the vibration of the vibration-proof object, and the vibration energy of the vibration-proof object is converted and absorbed as the vibration energy of the dynamic damper. Vibration characteristics are improved. In this product, the mass body is connected via a rubber-like elastic body that is separate from the elastic body arranged in the tubular part, so the spring constant of the rubber-like elastic body in the dynamic damper can be selected more freely. Therefore, the degree of freedom in design increases.

[0012]

1 is a plan view showing a first embodiment of a connecting rod according to the present invention, and FIG. 2 is a vertical sectional view thereof. The connecting rod 1 is used, for example, as a device for supporting a power unit of an automobile, and in this case, suppresses excessive rotation amplitude of the power unit due to reaction torque generated at the time of oscillation or sudden acceleration.

In the figure, reference numeral 2 denotes a linearly extending rod-shaped portion, and 3 denotes respective cylindrical portions integrally formed at both ends thereof, and each of these respective portions is made of a synthetic resin material. On the inner peripheral side of the tubular portion 3, tubular metallic mounting members 4 are concentrically arranged. One of these attachment members 4 is attached to the power unit and the other is fixed to a member of the vehicle body. Further, each mounting member 4 and the tubular portion 3 are connected by an elastic body 5 made of rubber. The elastic body 5 on one side
The so-called currant is formed on both sides of the rod-shaped portion 2 with respect to the extending direction of the mounting member 4 and between the rod-shaped portion 2 and the inner peripheral surface of the tubular portion 3.

A metal mass member 6 made of iron or the like is fixed to the rod-shaped portion 2 by resin integral molding. The mass member 6 is for adjusting the mass of the rod-shaped portion 2 and the cylindrical portion 3 formed of resin,
By selecting and integrally molding the mass member 6 having an appropriate weight, the natural frequency of the vibrating system including the connecting rod and the natural frequency of the mass body constituent portion including the portion between the elastic bodies 5 can be set. Can be easily matched.

The connecting rod 1 in this embodiment as described above is manufactured as follows. First, the elastic body 5 is formed by vulcanization adhesion on the outer peripheral side of the tubular mounting member 4. At this time, the mounting member 4 and the elastic body 5 having a predetermined shape and size are manufactured on one end side and the other end side of the connecting rod, respectively. Next, the assembly consisting of the mounting member 4 and the elastic body 5 is provided at a predetermined position in the resin molding die, that is, adjacent to the molding space for forming the tubular portion 3 and is provided on the inner peripheral side thereof. Install. At the same time, the mass member 6 having a predetermined mass
Is placed adjacent to a defined position in the mold, ie the molding space for the formation of the rod-shaped part 2. From this state, the resin material is injected into the mold, and the rod-shaped portion 2
Then, the rod-shaped portion 2 and the tubular member 3 are molded by flowing into the molding space of 1 and the molding space of the tubular member 3. Thus, the assembly and the cylindrical portion 3, and the mass member 6 and the rod-shaped portion 2 are integrally fixed to each other, and this method simplifies the working process.

The mass member 6 is not limited to one fixed by resin integral molding, but may be fixed by another fixing method. For example, the mass member 6 may be fixed to the rod-shaped portion 2 and the tubular portion 3 which are molded in advance. The member 6 may be fixed by screwing. In this case, since the mass member 6 is fixed by screwing later, it is possible to easily cope with a change in the mass member due to a specification change.

Next, the operation of this embodiment will be described. In this embodiment, based on the knowledge that the two elastic bodies in the connecting rod are the spring element and the damping element, and the portion sandwiching the two elastic bodies is the mass body to constitute the dynamic damper, the molded body is made of resin. The mass of the rod-shaped portion 2 and the cylindrical portion 3 is adjusted by fixing the mass member 6,
It is possible to adjust the natural frequency of the mass body constituent portion including the portion between the elastic bodies 5 to a desired value. By matching this natural frequency with the natural frequency of the vibration system including the connecting rod, the connecting rod functions as a dynamic damper, and as shown in FIG. The resonance of the constituent parts of the mass body cancels each other out, so that the vibration damping property is improved.

Also, paying attention to the vibration transmitted by the connecting rod, as shown in FIG. 9, the frequency curve of the connecting rod is made lighter as the connecting rod is made of resin, and the frequency curve slides to a higher frequency side than the metal rod. However, at this time, if vibration at a frequency of 450 Hertz is a problem, the frequency curve is moved by selecting and fixing an appropriate mass member 6 to avoid the problem of vibration at this frequency. It becomes possible. Thus, according to the present invention, depending on the application of the connecting rod, by integrating a mass member having an appropriate mass with the resin rod,
The connecting rod can be used optimally.

Next, a second embodiment of the connecting rod according to the present invention is shown in FIG. 3, and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 3, in the present embodiment, the rod-shaped portion 2 has a rubber-like elastic member 7 separate from the elastic body 5.
The mass member 6 is provided via the. To describe the manufacture of this product, the rubber-like elastic member 7 and the mass member 6 are integrally formed by vulcanization adhesion, and this assembly is installed at a predetermined position in the resin molding die. At this time, the elastic member 7 is adjacent to the molding space for forming the rod-shaped portion 2. From this state, the resin material is injected into the mold to flow into the molding space of the rod-shaped portion 2 and the molding space of the tubular member 3 to mold the rod-shaped portion 2 and the tubular member 3, and at the same time The solid body and the tubular portion 3, and the elastic member 7 and the rod-shaped portion 2 are integrally fixed to each other to manufacture the connecting rod 1.

In the connecting rod 1 of this embodiment, the rubber-like elastic member 7 is used as a spring element and a damping element,
Since the dynamic damper is configured by using the mass member 6 as a mass body, harmful vibration of the vibration system is suppressed and vibration damping characteristics are improved.

Next, a third embodiment of the connecting rod according to the present invention is shown in FIG. 4, and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 4, in this embodiment, a mass member 6 is provided on the outer peripheral surface of the tubular portion 3. This is a mass member having a predetermined mass with respect to the mounting hole 8 formed in advance in the resin cylindrical portion 3 in the same manner as described as another manufacturing method in the description of the first embodiment. It is manufactured by fixing 6 with a screw 10 inserted in a screw hole 9. The mass member 6 may be fixed by resin integral molding as in the first embodiment, or may be fixed by another fixing method.

Next, a fourth embodiment of the connecting rod according to the present invention is shown in FIG. 5, and this embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 5, in the present embodiment, the mass member 6 is provided on the tubular portion 3 via the rubber-like elastic member 7 separate from the elastic body 5. The manufacturing of this product will be described. The rubber-like elastic member 7 and the mass member 6 are integrally formed by vulcanization adhesion, and the assembly is provided with the elastic member 7 in the molding space position of the cylindrical portion 3 in the resin molding die. Install so that they are adjacent to each other. Then, from this state, the resin material is injected into the mold to flow into the molding space of the rod-shaped portion 2 and the molding space of the tubular member 3 to mold the rod-shaped portion 2 and the tubular member 3, and The connecting rod 1 is manufactured by integrally fixing the assembly and the tubular portion 3.

Next, a fifth embodiment of the connecting rod according to the present invention is shown in FIGS. 6 and 7, and the present embodiment will be described based on these drawings. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIGS. 6 and 7, in the present embodiment, the rod-shaped portion 2 is provided with an annular mass member 6. That is, the rod-shaped portion 2 made of a synthetic resin material connects the cylindrical portions 3 at both ends integrally formed with the rod-shaped portion 2 and extends linearly. An annular mass member 6 is attached to the outer circumference of the rod-shaped portion 2. The mass member 6 is made of metal such as iron, has an appropriate weight, and is fixed to the rod-shaped portion 2 by resin integral molding. The tubular portions 3 arranged at both ends of the rod-shaped portion 2 each have a mounting member 4 on the inner peripheral side thereof, and each of the mounting member 4 and the tubular portion 3 has an elastic body 5 made of rubber. Are connected by. The elastic body 5 is provided with a currant 8. In addition, in the present embodiment, the two tubular portions 3 and the mounting member 4 are provided.
Are twisted by 90 degrees, that is, the axial directions of the two mounting members 4 are orthogonal to each other. To describe the manufacture of this product,
The assembly consisting of the mounting member 4 and the elastic body 5 is installed in the resin molding die, and the mass member 6 is installed adjacent to the molding space position of the rod-shaped portion 2 in the resin molding die. Then, from this state, the resin material is injected into the mold to flow into the molding space of the rod-shaped portion 2 and the molding space of the tubular member 3, and the rod-shaped portion 2 and the tubular member 3 are then injected.
Is molded and the mass member 6 and the rod-shaped portion 2 are integrally fixed to each other, whereby the connecting rod 1 is manufactured.

The present invention can be applied in various ways other than the above-described embodiment. For example, the elastic member 5 is used to connect the mounting member 4 and another cylindrical member surrounding the mounting member 4 to each other. The tubular member may be fixed to the tubular portion 3.

[0029]

As described above, according to the present invention, it is possible to provide a connecting rod which can be reduced in cost and can easily improve the vibration damping property in order to take advantage of the advantage of being made of resin. .

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a connecting rod according to the present invention.

FIG. 2 is a vertical sectional view showing a first embodiment of a connecting rod according to the present invention.

FIG. 3 is a plan view showing a second embodiment of a connecting rod according to the present invention.

FIG. 4 is a plan view showing a third embodiment of a connecting rod according to the present invention.

FIG. 5 is a plan view showing a fourth embodiment of a connecting rod according to the present invention.

FIG. 6 is a perspective view showing a fifth embodiment of a connecting rod according to the present invention.

FIG. 7 is a vertical cross-sectional view showing a fifth embodiment of a connecting rod according to the present invention.

FIG. 8 is a diagram showing a graph showing an example of the vibration isolation performance of the connecting rod according to the present invention.

FIG. 9 is a graph showing another example of the vibration damping performance of the connecting rod according to the present invention.

[Explanation of Codes] 1 connecting rod 2 rod-shaped member 3 tubular member 4 mounting member 5 elastic body 6 mass member 7 elastic member

Claims (2)

[Claims] 1. A rod-shaped portion, tubular portions formed at both ends of the rod-shaped portion, mounting members disposed in the respective tubular portions, the tubular portion and the mounting member. An elastic body interposed between the rod-shaped portion and the tubular portion, and the rod-shaped portion and the tubular portion are integrally formed of a resin. A connecting rod formed by fixing mass members. 2. A rod-shaped portion, tubular portions formed at both ends of the rod-shaped portion, mounting members disposed in the respective tubular portions, the tubular portion and the mounting member. An elastic body interposed between the rod-shaped portion and the tubular portion, and the rod-shaped portion and the tubular portion are integrally formed of resin, and the rod-shaped portion or the tubular portion has a rubber-like elastic body. A connecting rod in which a mass member for mass adjustment is fixed via a connecting rod.