JPS5936739Y2 - Disc for improved flexible coupling - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flexible coupling disk that flexibly connects a drive shaft and a driven shaft and smoothly transmits rotational force.

Figures 1 and 2 show a conventional flexible coupling disk, in which 1 is a rubber disk with a hollowed out center, and symmetrically with respect to the center are a plurality of cylindrical bushings 2 with flanges at both ends.
is planted.

3 is a restraining member formed in a loop shape, and is made of rayon,
It is made by bundling fiber cords such as polyester into a rectangular cross-sectional shape, and a cylindrical bushing is inserted between the flange portions 10 of the cylindrical bushings 2 so as to restrain each pair of adjacent cylindrical bushings 2. The hanging position of the bushings is alternately shifted.

Here, the state of the loop-shaped restraint member 3 embedded in the rubber disk is as shown in FIG. When the fiber cords constituting the member 3 are buried in the rubber disk, both the fiber cords placed at the inner circumference position A and the cords placed at the outer circumference side of the loop have the same constant tension. It was buried in a state where it was given a

Therefore, when connecting the driving shaft and the driven shaft,
To the cylindrical bushing 2 of the rubber disk 1, a flanch with protruding hook-shaped arms is attached to each shaft at a corresponding position on every other shaft, and the positions of the arms on the driving shaft side and the driven shaft side are set on the cylindrical bushing 2. The bolts are inserted into the arm of the flange and the cylindrical bushing 2, and the bolts are inserted into the cylindrical bushing 2
The drive shaft and driven shaft are connected by tightening nuts at 10 locations on the flange.

Here, in the flexible coupling disk having the above configuration,
There are disadvantages as described below.

FIG. 4 is a diagram showing the state of the restraining member 3 after the coupling disk having the above structure is actually operated and a load is applied.

That is, in the restraining member 3 that is suspended between a pair of adjacent cylindrical bushings 2, 2', the fiber cords constituting it are arranged tightly on the side near the outer surface a of the cylindrical bushings 2, 2'. ,
The outer surface a of the cylindrical bushing 2°2' becomes rougher as it goes outward.

The reason is that when manufacturing the coupling disc,
In the restraining member 3, each fiber cord is stretched between a pair of adjacent cylindrical bushes 2 and 2' with equal tension, that is, with the same density as a whole, and in this state, the molding die is The unvulcanized rubber material that forms the rubber disc 1 is injected into the mold, heated and vulcanized to produce the rubber disc 1.

At this time, each fiber cord forming the restraint member 3 is given a certain shrinkage margin by heating and subsequent cooling.

Therefore, once this coupling disk is operated and a load is applied, each fiber cord constituting the restraining member 3, which has been given the above-mentioned certain shrinkage margin, stretches. Of the fiber cords constituting the restraining member 3, the absolute amount of the fiber cords on the outside is larger than that of the fiber cords wrapped around the side closer to the outer surface a of the cylindrical bushes 2, 2', and as a result, the above-mentioned As described above, in the restraining member 3 that is stretched between the cylindrical bushes 2 and 2', the fiber cords that make up the restraining member 3 are arranged tightly on the side closer to the outer surface a of the cylindrical bushes 2 and 2'. The outer surface a of 2' becomes rougher toward the outside.

This means that when the coupling is in operation and a load is applied, the force is transmitted only by the fiber cord near the outer surface a of the cylindrical bushing 2, of the restraining member 3 that transmits torque. The cord portion accelerates fatigue and wears out due to the strong frictional force generated between the surface a of the cylindrical bushing 2, leading to early breakage of the restraining member 3.

The present invention was developed in view of the above circumstances, and its gist is that a plurality of cylindrical bushings with flanges at both ends are planted symmetrically around the center of a rubber disk with a hollowed out center. Between the cylindrical bushes, fiber cords such as rayon, polyester, etc. are bundled into a rectangular cross-sectional shape, and a loop-shaped restraining member is inserted between the cylindrical bushes so as to restrain each pair of adjacent cylindrical bushes. In a flexible coupling disk that is embedded in a rubber disk by alternately shifting the connecting positions to the bushings, the flexible coupling disk is shaped like a loop to be stretched between the two adjacent cylindrical bushings. The restraining member is recessed toward the inner circumference at the center between the inner cylindrical bushes, and the fiber cord is laid in a relaxed state and is placed close to the side where the convex arcs are in contact with the outer surface of the cylindrical bushes. be.

Next, this will be explained according to the drawings.

The present invention has the same structure as the conventional example explained in FIGS. A plurality of cylindrical bushings 2 with flanges at both ends are planted symmetrically with respect to the center of the disc 1, and fiber cords such as rayon, polyester, etc. A restraining member formed in a loop shape and having a rectangular cross section is hung from the cylindrical bushing 2 at alternating positions, and is embedded in the rubber disk 1.

FIG. 5 shows the structure of a restraining member 30 according to the present invention, which is hung in a loop shape between adjacent cylindrical bushes 2 and 2'.

The restraint member 30 is made of a fiber cord made of rayon, polyester, etc. wound in a loop shape, and its cross section has a rectangular shape as shown in FIG.

Thus, the restraining member 30 is recessed toward the inner circumference at the center between the cylindrical bushes 2° and 2', and is arranged near the side that contacts the outer surface of each cylindrical bushing 2, 2' so that the convex arcs oppose each other. The fiber cord is buried in a relaxed state.

With the improved flexible coupling disc of the present invention having the above-described structure, when the coupling is actually operated and a load is applied, the restraining member 30 passes between the cylindrical bushes and transmits torque. The conventional restraining member 3 in which the same tension is applied to all the fiber cords, once the torque is applied, the outer surface a of the cylindrical bushing 2 among the fiber cords making up the restraining member 3 Codes that can be placed close to each other should be placed closely together.
On the other hand, as it goes further outward, it becomes rougher, and as a result of the non-uniformity, the durability of the restraining member 3 is inferior. The fiber cord placed on the outside has a larger absolute amount of elongation after a torque load is applied, but the fiber cord placed on the side closer to the outside surface a of the cylindrical bush 2 has a larger absolute amount of elongation after a torque load is applied. Since the fiber cords are pre-relaxed, once a torque is applied, that is, in normal use, the restraint member 30 is uniformly arranged, and the restraint member 30 transmits torque unbiasedly as a whole. ,
Good durability can be improved.

It should be noted that, of course, there is a rubber material between each fiber cord of the restraint member 30 buried in the rubber disk during manufacturing, but once torque is applied, the rubber material between each fiber cord deforms.
It exists between each fiber cord in a contracted state and prevents each fiber cord from coming into direct contact with each other.

[Brief explanation of the drawings] Figure 1 shows a conventional example, a plan view in half cross section, Figure 2 is a sectional view taken along line X-X in Figure 1, and Figure 3 shows only the main parts of Figure 1. FIG. 4 is an enlarged sectional view of the conventional flexible coupling disk, and FIG. 5 is an enlarged sectional view of only the main parts to explain the present invention. , FIG. 6 is a cross-sectional view taken along the line ■-■■ in FIG. DESCRIPTION OF SYMBOLS 1... Rubber disc, 2... Cylindrical bush, 3... Restraint member, 10... Flange portion, 30... Restraint member .

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical bushings with flanges at both ends are planted symmetrically in the center of a rubber disk with a hollowed out center, and fiber cords of rayon, polyester, etc. are bundled in a square cross-sectional shape between the cylindrical bushings and made into a loop. The formed restraint members are hung on the cylindrical bushings at alternating positions so as to restrain each pair of adjacent cylindrical bushings, and embedded in a rubber disk. In the flexible coupling disk, a restraining member formed in a loop shape to be stretched between the two adjacent cylindrical bushes is recessed toward the inner periphery at a central location between the cylindrical bushes, and the convex arcs oppose each other. A disk for an improved flexible coupling, characterized in that a fiber cord is buried in a relaxed state and is placed close to the side in contact with the outer surface of a cylindrical bushing.