CN1376866A - Electromagnetic rope clutch - Google Patents

Abstract

An electromagnetic rope clutch, characterized in that: on the surface of the driving shaft between the driving shaft and the driven sleeve, or on the surface of the driven shaft between the driving sleeve and the driven shaft, a steel wire rope is helically wound; An electromagnetic coil connected in a power circuit is installed on the driving shaft, the driven shaft or the driving sleeve and the driven sleeve. Its working principle is to distribute steel fibers, that is, steel wire ropes, between the two magnetic poles. When the power is off, the two poles are separated; The separation and reunion is realized by electromagnetic, which can reach a very high frequency; because the contact points of the steel fibers are random, the working surface will not be burned when overloaded and slipped; moreover, it has very low requirements for precision. The electromagnetic rope clutch has the advantages of simple structure, small size and low cost, can transmit large torque, and has high operating frequency.

Description

Electromagnetic Rope Clutch

1. Technical field

The invention relates to an electromagnetic clutch, in particular to an electromagnetic rope clutch.

2. Background technology

A clutch is a device used to separate and combine two transmission parts. At present, rigid clutches, friction clutches, electromagnetic clutches, hydraulic clutches, and pneumatic clutches are widely used in machinery.

When the clutch is required to have a high operating frequency, such as dozens of times of separation and combination per second, only the magnetic powder clutch in the electromagnetic clutch can meet this requirement; when the diameter is small, such as tens of millimeters, and , It is required to transmit a large torque, such as hundreds of Nm, because the force chain strength of the connection between the magnetic powder is low, it cannot meet this requirement. In addition, the magnetic powder is easy to age, which will increase the difficulty of use.

3. Contents of the invention

The technical problem to be solved by the present invention is to provide an electromagnetic rope clutch capable of high-frequency action, small size and large torque. The clutch adopts flexible magnetic material and force transmission material—steel wire rope. When the power is off, it does not contact the working surface of the driving drive shaft and the working surface of the driven drive sleeve, so that the two become separated; when the power is on, it simultaneously It is in full contact with the working surface of the driving transmission shaft and the working surface of the driven transmission sleeve, so that the two are integrated and can achieve high connection strength.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: on the surface of the driving shaft between the driving shaft and the driven sleeve, or on the surface of the driven shaft between the driving sleeve and the driven shaft, the steel wire rope is wound in a spiral layer; An electromagnetic coil connected in a power circuit is installed on the driving shaft and the driven shaft or in the driving sleeve and the driven sleeve.

In the above structure, when the coil is not energized, there is a certain gap between the inner edge of the steel wire rope and the outer cylindrical surface of the driving shaft or the driven shaft; there is a certain gap between the outer edge of the steel wire rope and the inner wall of the driven sleeve or the driving sleeve; therefore, the driving shaft And the driven sleeve or the driven shaft is separated from the driving sleeve. From the point of view of the magnetic circuit, the sleeve or shaft at this time is equivalent to the magnetic yoke, and the magnetic force generated makes the shaft and the sleeve pull the outer edge of the steel wire rope closest to the coil to their own side, so that the outer edge of the steel wire rope is in contact with the inner wall of the sleeve. , suck together, and at the same time make the inner edge of the wire rope and the shaft suck together. Because each steel wire rope is composed of several strands of steel wire. After being subjected to magnetic force, the end surface of the wire rope is deformed into an ellipse. In this way, the magnetic line of force passes through the sleeve, the steel wire rope, and the shaft to form a closed loop. In the loop, the medium is all steel. Therefore, the magnetic resistance is very small, which increases the magnetic induction intensity by thousands of times and produces a large magnetic attraction force.

The technical effects of the present invention are as follows: 1. Flexible steel wire rope is used as the separation and combination medium. In the process of shaft and sleeve clutching, the steel wire rope is deformed, but does not show resistance, and reactive power conversion is realized; 2. Clutch requirements In the tangential force transmission, and the steel wire of the steel wire rope is approximately tangentially distributed, the tensile strength of the steel wire is much higher than that of the magnetic powder chain, so the shear stress per unit area is very large; , and the structure is very simple; 4. The contact surface between the helically wound steel wire rope and the main and driven parts is comprehensive and random, so the wear of each part is very small; 5. When overloaded, the steel wire and the steel surface will slip and will not 6. Electromagnetic force is used to realize the clutch between the wire rope and the main and driven parts. The inertia of the wire rope is small and the response is fast. The clutch can reach a high operating frequency; 7. The clutch has small dimensions. Compared with the multi-plate structure clutch, the present invention will squeeze out the air in the middle when the multiple plates are compressed, and stick each plate together. Therefore, there will be a hysteresis when the power is cut off, while the present invention is a point contact, and immediately after power-off separate.

Therefore, the present invention is a clutch with large transmission torque, high operating frequency, simple structure, small volume and low cost.

4. Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of a clutch embodiment of the present invention.

Figure 2—an enlarged schematic view of part A in Figure 1.

Figure 3—View B of Figure 2.

In the figure, 1-driving shaft, 2-driven sleeve, 3-coil, 4-fitting sleeve, 5-steel wire rope, 6-slip ring.

(5), specific implementation

In the embodiment shown in Fig. 1, the driving shaft and the driven sleeve are used. In this embodiment, since there is a certain gap between the steel wire rope 5 and the outer cylindrical surface of the driving shaft 1, the two do not contact; Contact, but the positive pressure is only the weight of the steel wire rope, so the friction is very small. When the driving shaft 1 rotates, the driven sleeve 2 does not rotate; The end surface is deformed, and the outer edge part close to the driven sleeve 2 is adsorbed on the inner wall of the sleeve, as shown at point P in Figure 2, and the inner edge part close to the driving shaft is adsorbed on the outer cylindrical surface of the driving shaft, as shown in the figure The point Q in 2 is shown; the magnetic field line is formed by the yoke (i.e. sleeve 2) passing through point P of the steel wire rope, along the nearest route of each steel wire in the end surface of the steel wire rope, passing through Q into the armature (i.e. shaft 1), and then passing through the wire rope on the other side to form For the all-steel circuit, there are several M1, M2, M3..., N1, N2, N3... The .. point (as shown in Figure 3) increases the magnetic permeability by thousands of times, which is equivalent to absorbing all steel parts into one.

In the above embodiments, the coil 3 is located in the inner ring groove formed by the driven sleeve 2 and the fitting sleeve 4; the coil 3 may also be located in the ring groove of the shaft. The steel wire rope 5 in the embodiment adopts GB1102-74 specification, and each is made of 19 strands of steel wire.

The present invention can also adopt the structural form of driven shaft and driving sleeve.

Claims (3)

1. An electromagnetic rope clutch, comprising a driving shaft or a driven shaft, a driven sleeve or a driving shaft and a coil, is characterized in that: the surface of the driving shaft between the driving shaft and the driven sleeve, or the driving sleeve and the driven shaft A steel wire rope is spirally wound on the surface of the driven shaft between them; an electromagnetic coil connected in the power circuit is installed on the driving shaft, the driven shaft or the driving sleeve and the driven sleeve. 2. The electromagnetic rope clutch according to claim 1, characterized in that: the coil (3) is located in the inner annular groove formed by the driven sleeve (2) and the fitting sleeve (4). 3. The electromagnetic rope clutch according to claim 1, characterized in that the coil (3) can also be located in the ring groove of the shaft.

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