RU2624174C2 - Excentric rope drive for torque transmission - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: device for transmitting the torque contains the set of at least three driving eccentrics, three driven eccentrics and three ring ropes. Each corresponding driving and driven eccentrics are connected by the ring ropes. The ring cable transmits the torque with the ability to move along the outer diameter of the eccentric, and the amount of the rope movement per one revolution is equal to the eccentric groove circumference length.

EFFECT: simplification of design.

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Description

Technical field

The invention relates to the field of engineering.

The prior art.

In the patent No. RU 2551403 C1 of 04/21/2015 a cable drive is described in which the torque is transmitted from the leading eccentric to the driven eccentric using an annular cable. In turn, this patent was the development of patent RU 2426021 C1 of 08/10/2011, in which the torque from the leading eccentric to the driven eccentric is transmitted using a cable fixed along a line passing through the axis of the leading and driven eccentrics, in which the cables are connected to the eccentrics through the bearings.

Disclosure of invention

The invention is aimed at giving an additional possibility of using a cable drive in mechanisms. The prototype of the device is the design described in patents No. RU 2426021 C1 of 08/10/2011 (The bearings on the eccentrics in this patent allow connecting the leading eccentrics to the followers using single cables). No. RU 2551403 C1 dated 04/21/2015 (The ring cable drive in this patent is implemented using two cables stretched around the periphery of the eccentrics, but the ring cable also does not rotate due to the used bearings on the eccentrics. This allows the cables to be fixed to the outer race of the bearings) . The practice of using an annular cable drive, in which the cable is connected to the eccentrics through bearings, showed that the rotation of the ring cable does not occur only at the moment of transmitting the maximum force, when the maximum force is perceived by another cable, the cable at partial load rotates together with the outer rings of the bearings. That is, it is possible to transmit the torque of the ring cable from the leading eccentric to the driven without bearings.

An annular cable mounted on the master and slave eccentrics will transmit torque while moving along the outer diameter of the eccentrics. The amount of movement of the cable in one revolution will be equal to the circumference of the stream on the eccentric. In a cable drive, the cost of bearings is more than 50% of the cost of the entire device. The elimination of the use of bearings between eccentrics and cables increases the economic effect of the use of ring cable drives. This is especially important when using on bicycles.

Thus, each eccentric will play the role of a tooth, and the annular cable - the role of a chain link. The rejection of bearings will increase the eccentricity without increasing the outer diameter swept by the eccentrics and reduce the width of the eccentrics. Outwardly, it will look like wedge and gear belt drives, widely used in mechanical engineering, with the difference that at least three ring cables are needed for wire transfer, as shown in FIG. 1 and 2.

If necessary, to increase the uniformity of the flow of torque on the drive and driven shafts, sets of eccentrics from four to twelve pieces are installed, as was proposed in the prototype.

Brief Description of the Drawings

A cable drive in which the cables are closed rings is shown in FIG. 1 and FIG. 2, where pos. 1 - section of the eccentrics in the center of the brook for the cable, pos. 2 - ring cables connecting eccentrics without bearings, pos. 3 - spline segment of the shaft of the axis of rotation for the installation of eccentrics.

An embodiment of the invention.

In FIG. 3 and FIG. Figure 4 shows the installation of a cable drive on a motorcycle in the case where ring cables are used on leading and driven eccentrics without bearings.

Claims (1)

A device for transmitting torque, containing a set of at least three leading eccentrics and the same set of driven eccentrics and annular cables connecting the eccentrics, characterized in that each corresponding driving and driven eccentrics are connected by annular cables mounted on the driving and driven eccentrics without bearings, the annular cable transmits torque with the possibility of movement along the outer diameter of the eccentric, and the amount of movement of the cable per revolution is equal to the circumference Creek stream on an eccentric.

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