JPS5918175Y2 - Improved flexible cutlet spring disc - 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.

As a flexible coupling disk, a plurality of metal cylindrical bushings 2 are implanted symmetrically with respect to the center of a rubber disk 1 as shown in FIGS. 1 and 2, and these cylindrical bushings It is known that a restraining member 3 formed in a loop shape is stretched between two adjacent cylindrical bushes 2.

In the figure, reference numeral 4 denotes a metal plate, which is caulked to the end face of the cylindrical bushing 2, and 5 is the center hole of the disc 1.

When connecting the drive shaft and the driven shaft, flanges with protruding hook-shaped arms are attached to each shaft at positions corresponding to every other cylindrical bush 2 of the disk 1, and the drive shaft side and the driven shaft are connected to each other. Arrange the arms of the flange on the drive shaft side alternately with respect to every other cylindrical bushing 2, insert the bolts into the arms of the flange and the cylindrical bushing 2, and tighten the nuts at the four places on the backing plate to connect the arms to the drive shaft. It connects the driven shafts.

Therefore, in the flexible coupling disk having the above structure, the restraining member 3 is made of a single material, such as a bundle of steel cords or a bundle of fiber cords, that is, a cord having the same elastic modulus. It is a form of formality in a bunch of.

Therefore, the torsion spring characteristics of the flexible coupling disc are linear from the start, and especially those with a high elastic modulus such as steel cord exhibit high torsion spring characteristics. Apply a strong shock to the shaft side.

Also, materials with a low elastic modulus such as polyamide fiber cords exhibit low torsional spring characteristics, and although they do not give a strong shock to the driven shaft like steel cords, they do not cause torsional deformation when large torque is applied. is too large, causing problems in durability.

In view of the above points, the present invention is designed to transmit torque without causing shock to the driven shaft during initial torque transmission, and thereafter exhibits high linear torsion spring characteristics to transmit torque without compromising durability. It was devised.

That is, in the present invention, a plurality of metal cylindrical bushes 2 are embedded in a rubber disc 1 symmetrically with respect to its center, and a restraining member 3 formed in a loop shape is placed between a pair of the cylindrical bushes 2 adjacent to each other. In a flexible coupling disc formed by hanging two members together so as to restrain them and embedding them in the disc 1, the structure of the restraining member formed in a loop shape is shown in FIG. It is formed from layers.

Therefore, the inner layer (the side in contact with the cylindrical bushing) is made of a bundle a made of cords made of polyamide, polyester fiber, etc., which have a low modulus of elasticity, while the outer layer is made of a bundle a made of cords made of polyparaphenylene terephthalamide, glass fiber, etc., which have a high modulus of elasticity. It is formed in

Furthermore, in the bundles a and l) of cords in the inner and outer layers, the bundle a in the inner layer is loosely wrapped around the bundle in the outer layer, and is embedded in the rubber disc 1.

In addition, in order to form the inner and outer layers of the above structure, by adjusting the feeding tension and winding by operating the machine, it is possible to wrap the cord loosely around the inner layer, while wrapping the cord densely around the outer layer. .

However, in the above structure, once a torque load is applied, the loosely wound inner layer bundle a contracts, and its width W1 (
On the other hand, when the outer layer is tightly wound into a bundle, its width W2 (Fig. 3) is hardly reduced, and therefore the inner layer cord bundle is reduced in width W2 as shown in Fig. 4. A space is created between the cord a and the outer layer cord b having the conventional width W2 which is hardly compressed, and a gap C is formed between the bundles a and l) of the inner and outer layers.

This will be explained in more detail as follows.

That is, the bundle a of the inner layer is loosely wound and the cord constituting it is made of polyamide, polyester fiber, etc. with a low modulus of elasticity, while the bundle a of the outer layer is tightly wound and composed of cords made of polyamide, polyester fiber, etc. The cords are made of a material with a high elastic modulus such as polyparaphenylene terephthalamide or glass fiber, and therefore, the bundle a,
Once torque is applied to l), the loosely wound inner layer a tightens and a gap C is formed between the two.

It should be noted that the width of the bundle a of the inner layer wound during this phase decreases, and the slack is accounted for by this decrease.

Moreover, the gap C is newly formed as described above, and of course there is no rubber at this location.

Furthermore, even if the torque is released and the gap C returns to the no-load state, it will not return to the state shown in FIG. However, each cord returns to its original state due to its elastic force, that is, a gap C is formed between it and the inner layer a which is being tightened.

Therefore, in the product of the present invention, during torque transmission, the bundle a of the inner layer, which initially has slack, does not function until the slack disappears, and the elastic modulus is exclusively relatively higher than that in the initial state where the slack has disappeared. Due to the action of the cord bundle a in the inner layer with a low coefficient of elasticity, the torsional spring characteristics are low, and as the torque increases thereafter, the gap C between the cord bundles a and b disappears, and the torque is transmitted exclusively through the cord bundle in the outer layer with a relatively high modulus of elasticity. Torque is transmitted by

Therefore, as shown in Figure 5A, the product of this invention exhibits a non-linear torsion spring characteristic that shows a gentle slope at the start and then a steep slope, allowing the initial torque to be applied smoothly without causing any shock to the driven shaft. This means that the information can be transmitted effectively and the durability is guaranteed.

According to the present invention, the coupling disk is entirely made of rubber, but the elastic modulus of this rubber is significantly lower than that of the fiber bundles in the inner and outer layers, and almost no torsional torque is applied. does not contribute to

[Brief explanation of drawings]

Figure 1 is a plan view showing a partial cross section to explain the conventional product.
Figure 2 is a sectional view taken along line XX in Figure 1, Figures 3 and 4 are enlarged cross-sectional views showing only the essential parts of the product of the present invention, and Figure 5 is a diagram showing the torsion spring characteristics of the product of the present invention. It is.

Claims (1)

[Scope of utility model registration request] A plurality of metal cylindrical bushes 2 are implanted in a rubber disc 1 symmetrically with respect to its center, and a loop-shaped restraining member 3 is attached to a pair of adjacent cylindrical bushes 2. In the flexible coupling disc which is embedded in the disc 1 so as to restrain it, the restraining member formed in a loop shape has a two-layer structure consisting of an inner and outer layer, and the inner layer has a modulus of elasticity of The bundle a is made of a cord made of polyamide, polyester fiber, etc. with a low modulus of elasticity, and the outer layer is made of a cord made of polyparaphenylene terephthalamide, glass fiber, etc. with a high modulus of elasticity. An improved flexible coupling disk characterized in that the bundle is tightly wrapped and embedded within a rubber disk.