JP2696307B2 - Shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional shaft coupling used for connection of a propeller shaft, for example.
There is a division type as shown in FIGS. In the drawing, reference numeral 21 (21 ₁ , 21 ₂ , 21 ₃ ,...) Denotes a shaft coupling base, which is generally connected to six bases by connecting pins 22 to form a shaft coupling. In this shaft coupling, the connecting pin 2
Two pins 2 to withstand the tension created between
A tension member 23, for example, an organic fiber bundle is wound around between 2 and 22, and the whole is covered with a rubber elastic body 24 so as to maintain elasticity. 6 and 7 are cross-sectional views taken along lines CC and DD in FIG. 5. The shaft coupling base 21 is generally fitted with a collar 26 having a flange 25 and a pipe 27. It is press-fitted into this. A fiber cord 23 is wound around the collar 26 and the pipe 27 in this state while maintaining a predetermined interval, and the whole is then wrapped and integrated with a rubber elastic body 24. It is. In the figure, the shaft coupling is completed by press-fitting the connecting pin 21 into the pipe 27 using six such bases 21 (21 ₁ , 21 ₂ , 21 ₃ ,...).

However, in this type of shaft coupling,
Since the fiber code 23 is wound around many layers, the variation of the code tension in each layer, and the adhesiveness between the codes 23 and between the codes 23 and the rubber elastic body 24 are not uniform. There are drawbacks. It is natural that there is a variation in characteristics between the substrates, and these factors further cause variations in the thermal contraction rate of the cord due to the action of heat in the rubber vulcanization process and the rubber elastic body. This has a significant effect on manufacturing and performance, such as the emergence of code on the surface.

[0004]

As described above, the present invention has been made to solve the drawbacks of the conventional shaft coupling, which is because the conventional shaft coupling is formed by winding and laminating a reinforcing cord and a rubber elastic body. It is an issue. That is, since the base of the shaft coupling is made of a synthetic resin, the strength of the shaft coupling is improved, the variation in performance is reduced, and not only simplicity in manufacturing, but also cost reduction and weight reduction are aimed at. In other words, since a part of the rubber elastic body is released from the outer peripheral edge of the synthetic resin, the degree of freedom of the rigidity change obtained as the shaft coupling increases, and the shaft coupling in a wider application range can be obtained. It became.

[0005]

Means for Solving the Problems The present invention has been intensively studied in order to solve the above-mentioned problems, and as a result, the following structure has been found to be solved. That is, a disk-shaped shaft coupling mounted between the drive-side shaft end and the driven-side shaft end to transmit power, and a plurality of cylindrical bodies 1 connected to the drive-side shaft are concentrically arranged. Arranged with a distance, a plurality of cylinders 2 connected to the driven side shaft are equidistant on a concentric circle,
And the cylinders 1 are alternately arranged, and each of the cylinders 1,
2 is surrounded by a rubber elastic body, and adjacent rubber elastic bodies are connected by a synthetic resin disc, and the rubber elastic body is released from an outer peripheral edge of the synthetic resin disc. It is a shaft coupling, and this synthetic resin disk is preferably formed continuously and integrally.

As the synthetic resin used in the present invention, a so-called engineering plastic is mainly employed, 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 with such a plastic to improve the strength may be used.

[0007]

According to the present invention, since the above-described structure is employed, the synthetic resin disk interposed between the cylinders 1 and 2 directly transmits the rotating torque instead of the fiber cord, and the synthetic resin disk is The torque is transmitted to the driven shaft by resisting the tensile force between the bodies 1 and 2 or the compressive force between the cylinders 2 and 1. In particular, the rigidity is determined by the tension and compression of the rubber elastic body interposed between the cylindrical metal fitting and the synthetic resin disk body, which is a type in which the entire circumference of the rubber elastic body is surrounded by the synthetic resin disk body. Is almost equivalent to However, the bending and axial stiffness are contributed by the tensile, compressive and shear stiffness in the direction perpendicular to the axis of the rubber elastic body interposed between the cylindrical metal fitting and the synthetic resin disc body. Since the portion is released from the outer peripheral edge of the synthetic resin board, the degree of this release increases the degree of freedom of rigidity on this surface. For example, regarding the rigidity in the axial direction, a relatively soft rigidity can be obtained because the degree of contribution of the tensile force to the synthetic resin body is small, and even if the bending rigidity is high, a rubber elastic body is required. Are soft, since a part of the outer surface is particularly open. In addition, the synthetic resin disk used in the present invention should be integrally formed as a whole, so that it can be easily manufactured and a sufficient torsional rigidity as a shaft coupling can be obtained.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a front view showing a first embodiment of the shaft coupling of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. In the figure, reference numeral 1 denotes a cylinder connected to a shaft on the driving side, and reference numeral 2 denotes a cylinder connected to the shaft on the driven side. Generally, the cylindrical body 1 and the cylindrical body 2 are respectively provided with two to three (two in this example), and correspond to yokes (not shown) extending from the respective axes, and these are arranged alternately. Things. In the shaft coupling shown here, the outer diameter of the cylindrical bodies 1 and 2 is 20
mm, the inner diameter was 15 mm, and the length was 35 mm.
Although the cylinders 1 and 2 are all arranged on concentric circles, the cylinders 1 and 2 may be arranged on different concentric circles in some cases. Reference numerals 3 and 4 denote rubber elastic bodies that surround the entire circumference of the cylindrical bodies 1 and 2, which absorb vibration when used in rotation.
It serves as a buffering function against a sudden load, and further serves to reduce noise. The rubber elastic bodies 3 and 4 are formed in a fan shape, and the wide-angle portion side is opened from the outer peripheral edge of a synthetic resin disk body 5 described later. Its thickness is 33 mm.

Reference numeral 5 denotes a synthetic resin disk having a thick cross surrounding the cylinders 1 and 2. The synthetic resin disk is provided with rubber elastic bodies 3 and 4 arranged at predetermined positions so as to be independent from each other. Here, a disc-shaped nylon resin having a thickness of 30 mm and an outer diameter of 150 mm is used. Since the synthetic resin disc body 5 used here is integrally continuous as a whole, it is easy to handle when manufacturing the shaft coupling. In the figure, reference numeral 6 denotes a center hole used when connecting to a shaft.

The synthetic resin disc body 5 has a function of setting each of the tubular bodies 1 and 2 at a predetermined position, and has a function of connecting the tubular body 1 connected to the drive-side shaft and the driven-side shaft during rotation use. It has a function of transmitting the tensile force between the connected cylinders 2, and has a function of a tensile body in a conventional shaft coupling. In this case, first, rubber elastic bodies 3 and 4 are integrated around the cylindrical bodies 1 and 2 by vulcanization bonding, and these are set at a position in a mold for forming a disk body. In general, the components are integrated, but it is also possible to first form the synthetic resin disc body 5 and then press-fit the rubber elastic bodies 3 and 4 containing the above-mentioned cylindrical bodies 1 and 2. .

As described above, in the shaft coupling of the present invention,
Since the rubber elastic bodies 3 and 4 are not completely surrounded by the synthetic resin disk 5, the rigidity of the shaft coupling can be changed depending on the degree of release. For this reason, a shaft coupling suitable for many uses can be obtained.

The synthetic resin disk 5 facing the cylinders 1 and 2 may be provided with a projection from the synthetic resin disk 5 in the circumferential direction. Therefore, the transmission characteristic of the linear rotation torque which rises suddenly is excellent. In addition, this projection can also be made to protrude from the cylindrical bodies 1 and 2.

Further, a currant may be formed on the rubber elastic bodies 3 and 4 so as to face the cylindrical bodies 1 and 2. If such a shaft joint is used, a soft joint in the direction of the curl can be obtained.
Incidentally, it is also possible to provide a combination of this currant and the above-mentioned protrusion in the rubber elastic bodies 3 and 4, for example, when the currant and the protrusion are formed on the same circumference of each rubber elastic body 3 and 4. In this case, since the rigidity is large in the rotating direction, a linear rotating torque transmission characteristic which rises rapidly can be obtained.

As described above, in the shaft coupling of the present invention, the positional relationship between the synthetic resin disc 5 and the cylinders 1 and 2 and the degree of release of the rubber elastic body 34 from the synthetic resin disc 5 are determined. By various changes, it is possible to obtain a shaft joint having a characteristic in performance. FIG. 3 shows a second embodiment in which the synthetic resin disc body 5 shown in FIG. That is, this example is characterized in that the entirety of the synthetic resin disc body 5 is rounded,
The cylindrical bodies 1 and 2 are filled with substantially constant rubber elastic bodies 3 and 4 on the inner peripheral side.

FIG. 4 shows a third embodiment in which the synthetic resin disk 5 shown in FIG. 1 is further modified. In this example, the tip end of the synthetic resin disk body 5 is further expanded, and the rubber elastic bodies 3 and 4 are almost even except for the release side (outer peripheral side of the shaft coupling).
4 is filled.

[0016]

According to the present invention, the synthetic resin disc is subjected to tension (or compressive force) applied between the cylinders, which is formed by winding a conventional fiber code many times. Since it is a single material rather than the upholstery, high precision can be achieved, and a material that is resistant to ozone, oil, and the like can be selected, and durability can be improved. The shaft coupling of the present invention is preferable when the rigidity with respect to the rotational torque is relatively high and the rigidity in the other direction is low. For example, the drive side yoke and the propeller shaft or the propeller shaft and the differential side for an automobile may be used. It is used for joints and others, and its application is wide.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a shaft coupling according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

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

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

FIG. 5 is a front view of a conventional shaft coupling.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a sectional view taken along line DD in FIG. 5;

[Explanation of symbols]

 1, 2 cylindrical body, 3, 4 rubber elastic body, 5 synthetic resin board.

Claims (2)

(57) [Claims] 1. A disk-shaped shaft coupling attached between a driving-side shaft end and a driven-side shaft end for transmitting power, wherein a plurality of cylindrical bodies 1 connected to the driving-side shaft are concentrically arranged. A plurality of cylinders 2 arranged at equal distances above and connected to the driven side shaft
Are arranged concentrically at equal distances and alternately arranged with the cylindrical body 1, surround each of the cylindrical bodies 1 and 2 with a rubber elastic body, and provide a synthetic resin disc body between adjacent rubber elastic bodies. Wherein the rubber elastic body is released from the outer peripheral edge of the synthetic resin disc body. 2. The shaft coupling according to claim 1, wherein said synthetic resin disk is formed continuously and integrally.