JPH04224314A - Shaft joint - Google Patents

Abstract

PURPOSE:To improve strength as a shaft joint, reduce unevenness of performance, realize easy manufacture, and reduce cost and weight as the shaft joint by constituting the basic body of the shaft joint by single synthetic resin. CONSTITUTION:It is a shaft joint like board which is mounted between shaft end on the drive side and shaft end on the driven side and transmits power. A plural number of cylinders 1 to be connected with a shaft on the drive side are arranged on concentric circle at equal distance. A plural number of cylinders 2 to be connected with a shaft on the driven side are arranged on concentric circle at equal distance and alternately with the cylinders 1. Each cylinder 1, 2 is surrounded by rubber elastic bodies, and the adjacent rubber elastic bodies are connected by synthetic resin board. Preferably, it is a shaft joint in which the whole periphery of rubber elastic bodies is surrounded by a synthetic resin board.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a shaft coupling used in a propulsion shaft, etc., which connects one shaft and another shaft to transmit rotational force, and for example, transmits the driving force of an engine. It can be used to connect a propeller shaft, a steering shaft that transmits the rotational force of a steering wheel, etc.

0002

[Prior Art] Fig. 13 shows an example of a conventional shaft coupling used for connecting a propeller shaft, for example.
, there are split types as shown in FIGS. 14 and 15. In the figure, 21 (211, 212, 213
,......) is the shaft coupling base, which is connected to the connecting pin 22.
Generally, six base bodies are connected to form a shaft joint. In this shaft joint, a tensile material 23, for example, an organic fiber bundle, is wrapped between the two pins 22, 22 so as to withstand the tension generated between the connecting pins 22, 22 installed in one base body 21. The entire body is covered with an elastic rubber 24 to maintain elasticity. 14 and 15 show cross-sectional views taken along line CC and line D-D in FIG. It is press-fitted into this. While maintaining the collar 26 and pipe 27 in this state at a predetermined distance, the fiber cord 2 is inserted into the collar 26.
3, and the whole is then wrapped with elastic rubber 2.
4 to be wrapped and integrated. In the figure, six such substrates 21 (211, 212, 213, . . .
...) and press-fit the connecting pin 21 into the pipe 27 to complete the shaft joint.

However, in this type of shaft coupling,
Since the fiber cord 23 is wound in many layers, the cord tension varies in each layer, and the adhesion between the cords 23 and between the cords 23 and the elastic rubber 24 is not uniform. There is. This naturally means that there are variations in properties between each substrate, and these are the causes, as well as variations in the heat shrinkage rate of the cord and the surface of the elastic rubber due to the action of heat during the rubber vulcanization process. This has a large impact on manufacturing and performance, such as the embossment of the cord on the board.

0004

[Problem to be solved] As described above, it is an object of the present invention to solve the drawbacks caused by the conventional shaft joints being made of a laminated layer of reinforcing cord and elastic rubber. The base of the joint is made of a single synthetic resin, which improves the strength of the shaft joint and reduces variations in performance.It is not only easy to manufacture, but also aims to reduce the cost and weight of the shaft joint. It is something that

[0005]

As a result of intensive studies to solve the above problems, the present invention has found a solution by adopting the following configuration. That is, it is a disc-shaped shaft coupling that is attached between the shaft end on the driving side and the shaft end on the driven side to transmit power, and the plurality of cylindrical bodies 1 connected to the driving side shaft are arranged concentrically. A plurality of cylindrical bodies 2 are arranged at a distance and connected to the shaft on the driven side, and are arranged at equal distances on a concentric circle and alternately with the cylindrical bodies 1, and each of the cylindrical bodies 1 and 2 is made of rubber. Provided is a shaft joint surrounded by an elastic body and in which adjacent rubber elastic bodies are connected by a synthetic resin disc body,
Preferably, it is a shaft joint in which the entire circumference of the rubber elastic body is surrounded by a synthetic resin disc body, and if the torque transmission characteristics are to be characterized, for example, the rubber elastic body surrounding the cylinders 1 and 2 is surrounded by a synthetic resin disc body. It is conceivable to form currants in a radial direction or a circumferential direction. As the synthetic resin used in the present invention, so-called engineering plastics are mainly employed, and among them, polyamide resin is generally used. Of course, it is also possible to use a composite system in which such plastic is mixed with fibers such as glass or carbon to improve strength.

[0006]

[Operation] Since the present invention adopts the above-described structure, the synthetic resin interposed between the cylinders 1 and 2 directly transmits rotational torque instead of the fiber cord, and this synthetic resin , 2, or cylindrical bodies 2 and 1.
Torque is transmitted to the driven shaft by resisting the compressive force between them.

[0007]

[Specific Examples] The shaft joint of the present invention will be explained in more detail below with reference to the drawings. FIG. 1 is a front view showing a first embodiment of a shaft coupling of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. In the figure, 1 is a cylindrical body connected to a driving side shaft, and 2 is a cylindrical body connected to a driven side shaft. Generally, two to three cylinders 1 and 2 are provided, each corresponding to a yoke (not shown) extending from each shaft, and these are arranged alternately. In the shaft coupling shown here,
The outer diameter of this cylinder was 20 mm, the inner diameter was 15 mm, and the length was 35 mm. Although the cylindrical body 1 and the cylindrical body 2 are all arranged on concentric circles, the cylindrical body 1 and the cylindrical body 2 may be arranged on different concentric circles depending on the case. Further, reference numerals 3 and 4 refer to rubber elastic bodies that surround the entire circumference of these cylinders 1 and 2, and have the effect of absorbing vibrations during rotation, buffering against sudden loads, and further reducing noise. It is provided for the purpose of reducing The outer diameter of the rubber elastic bodies 3 and 4 is 35 mm and the length is 33 mm.
It is. Reference numeral 5 denotes a synthetic resin disk body in which these rubber elastic bodies 3 and 4 surrounding the cylinders 1 and 2 are arranged at predetermined positions to make each one independent. Nylon resin is used. In the figure, 6 is a center hole used when connecting with the shaft.

The synthetic resin disc body 5 has the function of setting each of the cylinders 1 and 2 at a predetermined position, and also has the function of setting the cylinders 1 and 2 at predetermined positions, and also connects the cylinder 1 connected to the drive side shaft and the driven side shaft during rotation use. It functions to transmit the tensile force between the cylindrical bodies 2 to be connected, and functions as a tensile body in a conventional shaft joint. In this case, first, the rubber elastic bodies 3 and 4 are integrated around the cylindrical bodies 1 and 2 by vulcanization adhesion, and these are set in a position in a mold that forms the disc body, and then by injection molding of synthetic resin. Although it is common to integrate each element, a synthetic resin disk body 5 is first formed, and the rubber elastic bodies 3 and 4 have the above-mentioned cylinders 1 and 2 enclosed in the holes 7 provided therein. It is also possible to press fit. In this example, the outer periphery of the rubber elastic bodies 3 and 4 and the hole 7 of the synthetic resin disk body 5 are in contact with each other in a perfect circle, but the contact surfaces between the two do not necessarily have to be a perfect circle. .

FIG. 3 is a partial view of a second embodiment of the present invention, in which projections 8 are provided from the synthetic resin disk body 5 in the circumferential direction of holes 7 formed in the disk body 5. be. In such an example, the rigidity is high in the rotational direction, and therefore, the transmission characteristic of linear rotational torque that suddenly rises is excellent. Although the protrusion 8 is formed on the side of the synthetic resin disk body 5, it goes without saying that it can also be made to protrude from the cylinder bodies 1 and 2.

As a modification of this example, the hole 7 and the rubber elastic body 3 are
, 4 is considered to have an elliptical surface. That is, FIG. 4 shows a partial view of the third embodiment of the present invention, and if the long axis of the ellipse 7 is set to face the radial direction of the shaft joint, characteristics similar to those shown in FIG. 3 can be obtained. It happens. Considering this in reverse, by forming the protrusions 8 in the radial direction or arranging the long axis of the ellipse toward the circumferential direction, a shaft joint having a torque transmission characteristic with a gentle rise can be obtained.

FIG. 5 shows a fourth embodiment that further advances this purpose, in which a cylinder is sandwiched between the rubber elastic bodies 3 and 4, and currants 9 are formed inside and outside in the radial direction from the center. . When such a shaft joint is used, a joint that is sufficiently flexible in the direction perpendicular to the shaft can be obtained.

FIG. 6 shows a fifth embodiment in which a combination of currants 9 and projections 8 is provided in rubber elastic bodies 3 and 4. In this example, the gooseberries 9 and the protrusions 8 are formed on the same circumference of each rubber elastic body 3, 4, and as a result, the rigidity in the rotational direction is large, so that a linear rotational torque transmission characteristic that rises suddenly can be achieved. Obtainable. In this example, since the gooseberry 9 is formed in correspondence with the protrusion 8, it has a more linear rising characteristic than the shaft joint of the second embodiment shown in FIG. Of course, the projections 8 may be formed on the cylindrical bodies 1 and 2 as in the previous example.

FIG. 7 shows a sixth embodiment in which the rubber elastic bodies 3 and 4 are further covered with an outer cylinder 10. The disc body 5 is formed by vulcanizing and adhering the discs 5 and 5, and then setting them in a mold and injection molding a synthetic resin.

FIG. 8 shows a seventh embodiment showing a modification of the shaft coupling of the present invention. This is a seventh embodiment in which rubber elastic bodies 3 and 4 surrounding cylinder bodies 1 and 2 and synthetic resin body 11 are arranged alternately in a substantially trapezoidal shape to form a shaft joint. In this case, during rotation, the synthetic resin body 11 hardly resists the tensile force between the cylinders 1 and 2, but on the contrary, it cannot resist the compressive force between the cylinders 2 and 1. Therefore, rotational torque can be transmitted, and vibrations in a direction perpendicular to the shaft can be efficiently absorbed.

FIG. 9 shows an eighth embodiment showing a further modification of FIG. 8 described above. This is composed of two cylindrical bodies 1 and 2 each connected to the drive shaft side and the driven shaft side, and the rubber elastic bodies 3 and 4 surrounding these cylinder bodies form a chevron shape. In this example, the synthetic resin body 5 has a cross shape with a thick tip and is integrated with the rubber elastic bodies 3 and 4. Unlike the synthetic resin body 11 shown in FIG. 8, the synthetic resin body 5 used here is integral and continuous, so it is easy to handle when manufacturing a shaft joint.

FIG. 10 shows a ninth embodiment in which the synthetic resin body 5 shown in FIG. 9 is further modified. This example is characterized in that the entire synthetic resin body 5 is rounded. This is also Figure 8
This is easier to manufacture than the example above.

FIG. 11 is a front view showing a tenth embodiment of the present invention, and FIG. 12 is a sectional view taken along line BB in FIG. 11. In the figure, reference numerals 12 and 13 are strip-shaped discs made of nylon resin, into which the cylinders 1 and 2 are fitted. The distal ends of the disk bodies 12 and 13 have flanges 14 and 15 bent at right angles, and with the flanges 14 and 15 facing each other, the air space between the two is filled with a rubber elastic body 16. The shaft coupling of the present invention explained in FIGS. 1 to 10 is as follows:
In both cases, the rubber elastic body is compressed between the cylindrical body and the synthetic resin to transmit rotational force to the driven shaft side. A shaft on the driven side is connected to the bodies 2, 2 to transmit rotational force, but the rubber elastic body 16 mainly acts with shearing force, and the flanges 14, 1
Only the rubber elastic body 16 in the portion sandwiched between the two portions 5 attempts to transmit force with compressive force.

[0018]

[Effect] The present invention reduces tension (or compression force) between cylinders.
is received by a synthetic resin disk body, and because it is made of a single material, it can achieve higher precision than the conventional tensile body made by wrapping fiber cord many times, and Since it is a resin material compared to rubber, it is strong against contact with flying objects, etc., and can also be selected from a material that is resistant to ozone, oil, etc., and has improved durability. The shaft joint 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, the joint between the driving side yoke and the propeller shaft or the propeller shaft and the differential side of an automobile. It can be said that it is particularly suitable for

[Brief explanation of the drawing]

FIG. 1 is a front view showing a first embodiment of a shaft joint of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a partial front view showing a second embodiment of the shaft joint of the present invention.

FIG. 4 is a partial front view showing a third embodiment of the shaft joint of the present invention.

FIG. 5 is a front view showing a fourth embodiment of the shaft joint of the present invention.

FIG. 6 is a front view showing a fifth embodiment of the shaft joint of the present invention.

FIG. 7 is a front view showing a sixth embodiment of the shaft joint of the present invention.

FIG. 8 is a front view showing a seventh embodiment of the shaft joint of the present invention.

FIG. 9 is a front view showing an eighth embodiment of the shaft joint of the present invention.

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

FIG. 11 is a front view showing a tenth embodiment of the shaft coupling of the present invention.

12 is a sectional view taken along line BB in FIG. 11. FIG.

FIG. 13 is a front view of a conventional shaft joint.

FIG. 14 is a sectional view taken along line CC in FIG. 13.

FIG. 15 is a cross-sectional view taken along line DD in FIG. 13.

[Explanation of symbols]

1, 2... Cylindrical body 3, 4, 16... Rubber elastic body 5, 11, 12, 13... Synthetic resin disk body 7... Hole provided in the synthetic resin disk body 8... Protrusion 9... Currant 10...Outer cylinder 14, 15...Flange

Claims (3)

[Claims] Claim 1: A disc-shaped shaft coupling that is attached between a shaft end on a driving side and a shaft end on a driven side and transmits power, in which a plurality of cylindrical bodies 1 connected to a shaft on the driving side are arranged in a concentric circle. A plurality of cylindrical bodies 2 are arranged at equal distances above and connected to the shaft on the driven side, and are arranged at equal distances on a concentric circle and alternately with the cylindrical bodies 1, each of the cylindrical bodies 1, 2 is surrounded by a rubber elastic body, and the adjacent rubber elastic bodies are connected by a synthetic resin disc body. 2. The shaft joint according to claim 1, wherein the entire circumference of the rubber elastic body is surrounded by a synthetic resin disk. 3. The shaft joint according to claim 1, wherein the rubber elastic body surrounding the cylinders 1 and 2 has currants formed in a radial direction or a circumferential direction from the center of the shaft joint.