JPH05202946A - Elastic coupling - Google Patents

Abstract

PURPOSE:To enhance drag against axial force with respect to an elastic coupling which connects a shaft on one side to a shaft on the other side to transmit torque and is used for a propeller shaft, etc. CONSTITUTION:This is a board-shaped coupling to be mounted between the end of a shaft on a driving side and the end of a shaft on the driven side and transmits torque, and, plural tube bodies 1 to be connected with shafts on the driving side are provided on a concentric circle leaving equal distance between them. Further, plural tube bodies 2 to be connected with shafts on the driven side are provided on a concentric circle leaving equal distance between them and arranged alternately with the tube bodies 1, and respective tube bodies 1, 2 are surrounded with elastic rubber bodies 3, 4, and also neighboring elastic rubber bodies 3, 4 are connected to each other with a synthetic resin board body 6 through cylindrical bodies 5 having flanges 50 facing the outside on both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic shaft coupling used for a propulsion shaft or the like for connecting one shaft and the other shaft to transmit a rotational force, and for example, transmits a driving force of an engine. It can be used for connecting a propeller shaft, a steering shaft for transmitting a rotational force of a steering wheel, and the like.

[0002]

2. Description of the Related Art Among conventional elastic shaft couplings, split type ones as shown in FIGS. 1, 2 and 3 are examples of those used for connecting propeller shafts. In the figure, 21 (21 ₁ , 21 ₂ , 21 ₃ , ...
...) is an elastic shaft joint base, and generally six bases are connected by a connecting pin 22 to form an elastic shaft joint. In this elastic shaft joint, a tensile member 23, for example, an organic fiber bundle is wound between the two pins 22 and 22 so as to withstand the tension generated between the connecting pins 22 and 22 mounted in one base 21. The rubber elastic body 24 covers the entire structure to maintain elasticity.

2 and 3 are sectional views of the elastic shaft joint shown in FIG. 1 taken along the lines AA and BB, in which the elastic shaft joint base 21 is generally a flange 25. And a pipe 27 is press-fitted thereto. A fiber cord 23 is wound in the color 26 while keeping the color 26 and the pipe 27 in this state at a predetermined interval, and the whole is wrapped with a rubber elastic body 24 and then integrated. Is. In the figure,
Six such bases 21 (21 ₁ , 21 ₂ , 21 ₃ , ...
...) is used to press-fit the connecting pin 21 into the pipe 27 to complete the elastic shaft coupling.

However, in this type of elastic shaft coupling, since the fiber cord 23 is wound in multiple layers, variations in the code tension in each layer, and the cords 23, 23.
There is a drawback that the adhesiveness between the space and the cord 23 and the rubber elastic body 24 is not uniform. This naturally means that there are variations in the characteristics between the bases, which causes the co-action due to the effect of heat in the rubber vulcanization process.
It has a great influence on the production and the performance such as the variation of the heat shrinkage rate of the cord and the protrusion of the cord on the surface of the elastic rubber.

[0005]

SUMMARY OF THE INVENTION As described above, an object of the present invention is to solve the drawbacks of the conventional elastic shaft coupling, which consisted of the winding lamination of the reinforcing cord and the elastic rubber. As a matter of fact, the present applicant filed Japanese Patent Application No. 2-4145.
No. 33 provided a completely new elastic shaft coupling. this is,
As shown in FIGS. 4 and 5, a plurality of cylinders 1 connected to the drive-side shaft are arranged concentrically on a concentric circle, and a plurality of cylinders 2 connected to the driven-side shaft are concentrically arranged. Are arranged equidistantly from each other and are arranged alternately with the cylinders 1, and the cylinders 1 and 2 are surrounded by the rubber elastic bodies 3 and 4, and the rubber elastic bodies 3 and 4 adjacent to each other are generally separated from each other. Relates to an elastic shaft joint connected by a synthetic resin board body 6 reinforced with glass fiber or the like.

In the previously proposed invention, the cylindrical body 1,
The synthetic resin board 6 receives a tension (or a compressive force) applied between the two, which is higher than that of a tensile body formed by winding a fiber cord in a conventional elastic shaft coupling many times. Since it is a single material, it can achieve high precision, and because it is a synthetic resin material compared to rubber, it is strong against contact with flying objects and is also strong against ozone, oil, etc. The material can be selected and the durability is improved.

The present invention is a further effective improvement of the above-mentioned proposal, and such an elastic shaft coupling transmits, for example, a propeller shaft for transmitting a driving force of an engine and a rotational force of a steering wheel. It is used for the connecting portion of the steering shaft, but in some cases, it may be connected in advance with a certain declination between the drive side and the driven side. In this case, when the shaft rotates to transmit the driving force, an axial force is generated in the elastic shaft coupling connected thereto in the axial direction. However, so-called engineering plastics are also used for the above-mentioned proposed synthetic resin board of the elastic shaft joint, but a reinforced resin board by the SMC method in which a reinforcing layer knitted with glass fiber or the like is embedded in the synthetic resin is used. In some cases, the strength is extremely high in the circumferential direction in the plane where the axial force is applied, but on the other hand, the strength in the axial direction is relatively low and the case cannot withstand this axial force. Can also be considered.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an elastic shaft coupling suitable for transmitting a large driving force while generating an axial force, and has been solved by adopting the following constitution. It is a thing. That is, the gist of the present invention is a disc-shaped shaft coupling that is mounted between a drive-side shaft end and a driven-side shaft end to transmit power, and a plurality of tubular bodies that are connected to the drive-side shaft. 1 are arranged on a concentric circle at equal distances, and a plurality of cylinders 2 connected to a shaft on the driven side are arranged on a concentric circle at equal distances, and are alternately arranged with the cylinders 1. The bodies 1 and 2 are surrounded by the rubber elastic bodies 3 and 4, and the adjacent rubber elastic bodies 3 and 4 are connected by the synthetic resin board body 6 via the cylindrical body 5 having outwardly facing flanges. The present invention relates to the elastic shaft coupling.

Generally, an elastic shaft joint in which the entire circumferences of the rubber elastic bodies 3 and 4 are surrounded by the synthetic resin disc body 6, and when the torque transmission characteristic is to be characterized, for example, the cylindrical body 1 is used. It is conceivable that the rubber elastic bodies 3 and 4 surrounding 2 are formed with currants in the radial direction or the circumferential direction from the center of the shaft joint.

As a material for the synthetic resin board of the present invention, what is called an engineering plastic is mainly adopted, and among them, a polyamide resin is generally used. Needless to say, a composite system in which fibers such as glass and carbon are mixed or laminated with the adopted plastic to improve strength may be used. The cylindrical body with a flange is mainly made of metal and has a high strength, but in some cases, the engineering plastic as described above is used in some cases.

[0011]

Since the present invention adopts the above-described structure, the tubular body 1, instead of the fiber cord of the conventional elastic shaft coupling,
The synthetic resin board interposed between the two directly transmits the rotational torque, and this synthetic resin board resists the tensile force between the cylinders 1 and 2 or the compressive force between the cylinders 2 and 1. By doing so, the torque is transmitted to the driven shaft.

The force in the axial direction is borne by the cylindrical body interposed between the rubber elastic body and the synthetic resin disc body.
Even if they are connected with the above-described declination, they can withstand sufficient use and can transmit a large circumferential force (torque).

The rubber elastic body and the synthetic resin board are connected through a cylindrical body, and the means for this connection is, for example, as follows. Taking a metal cylinder as an example, the first method is to set this cylinder at a predetermined position in a molding die and maintain this state when molding a synthetic resin board. And synthetic resin molding is performed to integrate the synthetic resin board and the cylindrical body. Then, after that, the rubber elastic body is vulcanized and adhered to the cylindrical body, or the inner cylinder preliminarily vulcanized and adhered to the rubber elastic body is pressed into the cylindrical body.

Another method is to first mold a synthetic resin board,
This is a method in which a cylindrical body is fitted into this, and the flange is formed by crimping the end of this cylindrical body to the outside. In this case, it is preferable to first form a flange on one end and then fit the synthetic resin board and then crimp the other end. In some cases, when fitting the synthetic resin board, A so-called bush type, in which the rubber elastic body and the inner cylinder are integrated, is used, and after fitting this, the other end is swaged outward to form a flange and the whole is connected.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The elastic shaft coupling of the present invention will be described in more detail with reference to the drawings. FIG. 6 is a front view showing a first embodiment of the elastic shaft coupling of the present invention, and FIG. 7 is a sectional view taken along line D-D in FIG. In the figure, 1 is a cylinder connected to the drive-side shaft, and 2 is a cylinder connected to the driven-side shaft. Each of the cylindrical body 1 and the cylindrical body 2 is generally provided with two or three pieces corresponding to the yokes (not shown) extending from the respective axes, and these are arranged alternately.

In the elastic shaft coupling shown here, the outer diameters of the cylindrical bodies 1 and 2 were 20 mm, the inner diameter thereof was 15 mm, and the length thereof was 35 mm. Although the cylinders 1 and 2 are all arranged on the concentric circles, the cylinders 1 and 2 can be arranged on different concentric circles in some cases. Reference numerals 3 and 4 denote rubber elastic bodies that surround the entire circumferences of the cylindrical bodies 1 and 2, and have a function of absorbing vibration during use in rotation, a function of buffering a sudden load, and a noise level. It is provided for reduction.
The rubber elastic bodies 3 and 4 have an outer diameter of 35 mm and a length of 33 mm.
Is. Reference numeral 6 is a synthetic resin disc body in which these rubber elastic bodies 3 and 4 surrounding the cylindrical bodies 1 and 2 are arranged at predetermined positions to be independent of each other, and here, a disc body having a thickness of 30 mm and an outer diameter of 150 mm. It is a disc body made of polyester resin on which a woven glass fiber cloth is laminated. The reference numeral 5 designates a metal cylindrical body interposed between the synthetic resin board 6 and the rubber elastic bodies 3 and 4. At both ends, the board 6 is directed outward from the front and back. A flange ₅₀ is provided so as to sandwich it. In the figure, reference numeral 7 denotes a center hole used when connecting with a shaft (not shown).

The synthetic resin board 6 has a function of setting the cylinders 1 and 2 at predetermined positions, and is connected to the shaft on the driving side and the shaft on the driven side when being used in rotation. It has a function of transmitting a tensile force between the connected cylindrical bodies 2 and has a function of a tensile body in a conventional elastic shaft joint, and in particular, this composition is performed via the rubber elastic bodies 3 and 4. An axial force is applied to the peripheral edge of the hole 8 of the resin board 6,
Becomes enclosing the periphery of the hole 8 at the flange 5 ₀ of the cylinder 5, such force cylinder 5 receives a synthetic resin plate material 6
The peripheral edge of the hole 8 is protected.

FIG. 8 is a front view showing a second embodiment of the elastic shaft coupling of the present invention, and FIG. 9 is a sectional view taken along the line EE in FIG. In this example, the hole portion 8, the flanged cylindrical body 5, the rubber elastic bodies 3 and 4, and the inner cylinders 1 and 2 in the synthetic resin board 6 each have an elliptical shape. By arranging the major axis of the ellipse in the radial direction of the synthetic resin board 6, the rigidity is high in the rotation direction, and therefore, the linear rotation torque transmission characteristic that rises abruptly is obtained. In other words, by arranging the major axis of the ellipse in the circumferential direction, the elastic shaft coupling has a torque transfer characteristic with a gentle rise.

FIG. 10 shows a third embodiment of the elastic shaft coupling of the present invention which further promotes such an object, and FIG. 11 is a sectional view taken along the line FF of FIG. In this example, the rubber elastic bodies 3 and 4 are sandwiched between the cylindrical bodies 1 and 2, and the currants 9 are formed inside and outside in the radial direction from the center. When such an elastic shaft joint is used, a joint which is sufficiently soft in the direction perpendicular to the shaft can be obtained.

[0020]

According to the present invention, the synthetic resin board 6 receives the tension (or compression force) applied between the cylinders 1 and 2.
Since this is a single material compared to the conventional tension body formed by winding a fiber cord many times, it is possible to achieve higher precision, and because it is a synthetic resin material compared to rubber. It is possible to select a material having strength against contact with a flying object, etc., and also strong against ozone, oil, etc., thereby improving durability.

Particularly, the elastic shaft coupling of the present invention exerts its effect when it is connected between the shafts with a declination, and the flange 5 is effective against the axial force generated due to the declination.
It can be said that the cylindrical body 5 having ₀ bears this and has a sufficient resistance to the axial force.

Therefore, the shaft coupling of the present invention is preferable when the rigidity against rotational torque is relatively high and the rigidity in other directions is low. For example, a driving side yoke and a propeller shaft or a propeller shaft and a differential for an automobile. It is particularly suitable for the joint with the side.

[Brief description of drawings]

FIG. 1 is a front view of a conventional elastic shaft coupling.

FIG. 2 is a sectional view taken along line AA of the elastic shaft coupling of FIG.

3 is a cross-sectional view of the elastic shaft coupling of FIG. 1 taken along the line BB.

FIG. 4 is a front view of an elastic shaft coupling proposed in Japanese Patent Application No. 2-414533.

5 is a cross-sectional view taken along line C-C of the elastic shaft coupling of FIG.

FIG. 6 is a front view showing a first embodiment of the elastic shaft coupling of the present invention.

FIG. 7 is a cross-sectional view of the elastic shaft coupling of FIG. 6 taken along the line D-D.

FIG. 8 is a partial front view showing a second embodiment of the elastic shaft coupling of the present invention.

9 is a cross-sectional view of the elastic shaft coupling of FIG. 8 taken along the line EE.

FIG. 10 is a front view showing a third embodiment of the elastic shaft coupling of the present invention.

11 is a sectional view taken along line FF of the elastic shaft coupling of FIG.

[Explanation of symbols]

1 cylindrical body which is connected with the axis of ‥‥ drive side, 2 ‥‥ cylindrical body which is connected to the shaft of the driven side, 3, 4 ‥‥ rubber elastic body, cylindrical body having a 5 ‥‥ flange 5 _0, 5 ₀ ... Flange, 6 ... Synthetic resin board, 7 ... Center hole, 8 ... Hole in synthetic resin board 6, 9 ... Currant.

Claims (2)

[Claims] 1. A disc-shaped shaft coupling that is mounted between a drive-side shaft end and a driven-side shaft end to transmit a rotational force, and comprises a plurality of cylindrical bodies 1 connected to a drive-side shaft. A plurality of cylinders 2 arranged on a concentric circle at equal distances and connected to a shaft on the driven side are arranged on a concentric circle at equal distances and arranged alternately with the cylinders 1. , together with the surrounding 2 with rubber elastic body 3 and 4, through a cylindrical body 5 having a flange 5 ₀ toward the outside at both ends, was ligated between adjacent the elastic members 3 and 4 of synthetic resin board member 6 Elastic shaft coupling. 2. The shaft joint according to claim 1, wherein the rubber elastic bodies 3 and 4 surrounding the cylindrical bodies 1 and 2 are formed with currants in a radial direction or a circumferential direction from the center of the shaft joint.