Flexible shaft coupling

Claims

Figures 5 and 6 show the same cam arrangement when the clutch operates in one direction or the other. Figures 7 and 8 show a coupling – in axial and cross-sectional views – in which several spring bands are arranged side by side on a faceplate. In Figures 3 and 2, a disk b is connected to the shaft ↔, which is covered by a housing c. This housing is connected to the stub shaft g. A spring d is arranged in the cavity between the disk b and the housing c. This spring has a circular shape regardless of its cross-section and is supported on one side by a cam e located on the disk b and on the other side by a cam / located in the housing c. If the shaft ↔ is rotated in the direction of the arrow shown, the disk b, via the cam e, exerts a circumferential force resulting from the torque on the spring d, compressing it against the cam / , thereby driving the housing c and thus the shaft g along with it.The compression of spring d creates friction on the walls of housing c, which provides additional damping resistance. To allow for adjustment of this resistance, lubrication grooves are arranged on the friction surface of housing c. The degree of lubrication, and thus the magnitude of the friction, depends on the distribution of these grooves. To ensure that the belt is reliably protected against lateral deflection, a ring i is arranged on the disc b and a working edge h is located on the housing c. The described device operates in only one direction of rotation, but the same principle can be applied to both directions. One embodiment of this device is shown in Figures 3 to 6. In this device, the arrangement of parts a, b, c, g is the same as described above, as is the arrangement of the spring band d. However, the arrangement and design of the cams I and m differ. These do not extend across the entire width of the band d, but rather the cam / disc b is located in the middle of the band and is encompassed by the two cams m connected to the housing c, so that, viewed axially, the cams I and m are in contact when the coupling is at rest. Naturally, sufficient pressure transmission between the cams I and m and the spring d must be ensured in this case. The cams / and m can also be in non- The springs can be arranged symmetrically, for example, so that a cam m is on one side and the cam I is on the opposite side. This device is advantageous when, instead of the simple cylindrical band d, a spirally wound band 6s or helically wound band with more than one turn is used to increase the spring effect. The spiral or helical spring arrangement, which is known per se, allows for arbitrarily large spring forces. This can also be achieved by connecting several spring bands in series, in a manner also known per se, so that the total spring force equals the sum of the individual spring forces of the bands. Increased spring force can also be achieved by making the spring band slightly wavy in the radial or axial direction.However, care must be taken to ensure that the tensile stresses generated in the spring band by the initial bending stress remain below the limit resulting from the main compressive stress. Figure 7 shows a section along line AA in Figure 8, while Figure 8 shows the side view along section line BB in Figure 7. In this embodiment, several, specifically three, spring bands are connected side by side, so that the force to be transmitted can be multiplied without increasing the spring travel of the coupling. The faceplate w is mounted on the driving shaft Σ, while the cam-equipped faceplate 0 is mounted on the driven shaft g. The plate Σ has circular working rings %, M2, M3, corresponding to the number of spring bands d, against whose cylindrical inner walls the spring bands dv, d2, dz are mounted. The cylindrical surfaces W1, M2, and n3 have cams eltes, e3, which bear against the end faces of the spring bands U1, d2, and dz. These are supported at their other ends against the cams f%, / 2, / 3 of the counter plate 0. The coupling operates only in the direction of rotation indicated by the arrow. By modifying the cams e and f, a coupling can be created, as in the embodiment shown in Figures 3 to 6, which compresses the spring bands flt, f2, and fa in both directions of rotation. Patent claims: i. Flexible shaft coupling, consisting of coupling parts provided with drivers, such as an inner drum disc and an outer hollow cylinder, and spring rings arranged between the drivers for power transmission, characterized in that the respective the spring rings (d) are fitted into the hollow cylinder (c) over the entire circumference, so that they are only subjected to compression during force transmission, whereby the spring action is effected solely by elastic shortening of the spring ring(s) (d), but the compressive stress remains below the limit of wrinkling. Shaft coupling according to claim i, characterized in that the spring ring is wound in a spiral or helical shape. Here > sheet drawings