WO2013147641A1

WO2013147641A1 - Dynamic variable-speed drive

Info

Publication number: WO2013147641A1
Application number: PCT/RU2012/000877
Authority: WO
Inventors: Арвидас Юозович ШВАРЛИС
Original assignee: Shvarlis Arvidas Juozovich
Priority date: 2012-03-29
Filing date: 2012-10-26
Publication date: 2013-10-03
Also published as: RU2519302C2; RU2012112308A

Abstract

The variable-speed drive comprises a driving link in the form of an internally geared chain wheel 1, an inertia element in the form of an endless chain 2, and a driven link 3 which is fixed on an output shaft 4 and comprises a supporting wheel 5 and a clamping roller 6. Upon rotation of the driving link, the chain is set into rotation and is clamped with a force Fu6 against the internal surface of the chain wheel. Under the action of the supporting wheel, the chain changes the trajectory of movement circumferentially, thus producing torque on the output shaft of the driven link. The torque depends on the mass of the chain links and the speed of rotation of the driving link. In order to prevent the chain from dropping off the chain wheel, the variable-speed drive can be provided with chain limiters. In design alternatives, the supporting wheel can be movable in the radial direction and the clamping roller can be movable in a circular direction. Said movements make it possible to change the torque value on the output shaft and to tighten the chain in the stopping mode. The variable-speed drive can be used in transmission mechanisms and power take-off devices.

Description

Dynamic variator

The invention relates to gears and can be used in power take-offs.

Inertial impulse transmission SU 1581942 class. F16H 33/08, containing the drive link in the form of an asterisk, an inertial element in the form of an endless chain covering the sprocket from the outside and a driven link with a support wheel mounted on it.

A disadvantage of the known transmission is the low rotation speed, since it operates in a pulsed mode.

The aim of the invention is to expand the arsenal of technical means and increase the speed of rotation of devices of this class.

This goal is achieved by the fact that in a dynamic variator containing a driving link in the form of a sprocket, an inertial element in the form of an endless chain and a driven link with a support wheel mounted on it, the sprocket of the driving link is made in the form of an internal gear sprocket, an endless chain is placed inside a sprocket for interaction with it on the inside of its circumference and is equipped with a pinch roller interacting with the chain.

Brief Description of the Drawings:

FIG. 1- variator of the simplest design;

FIG. 2- driven link with a pressure roller moving in the circumferential direction; FIG. 3- driven link with a support wheel, moved in the radial direction; FIG. 4 - a special case of the design containing the support wheel, moved in the radial direction;

FIG. 5- special case of the reverse construction;

FIG. 6-special case of the design containing the guide mechanism; FIG. 7- a special case of the design in stop mode;

FIG. 8- the same design in rotation mode.

The variator shown in FIG. 1 contains: a driving link in the form of a chain wheel of internal gearing 1, an inertial element in the form of a massive endless chain 2, a driven link 3 rigidly mounted on the output shaft 4, the support wheel 5 and

pinch roller 6, with the possibility of rotation around its own axes, mounted on the output link 3

In FIG. 1 shown the simplest design of the variator works as follows.

Suppose that the driven link 3 is stopped and braked by the braking force FTP applied to the output shaft 4. When the driving link 1 rotates, an endless chain 2 is involved in the teeth of the wheel of the driving link 1 and under the influence

centrifugal force Fn6 is pressed against the inner surface of the sprocket. When the chain rotates, its links acquire kinetic energy. The support wheel 5, stopped by the driven link 3, impedes the movement of the chain 2 along the circumference in conjunction with the chain wheel and the chain 2 is forced to change the path to bypass the obstacle, while exerting pressure on the surface of the support wheel 5 in the place where it is in contact with the chain . Part of the kinetic energy of the links of the chain 2 is transmitted to the support wheel 5, creating a torque Mkr on the driven link 3, and rotates the driven link. The microcircuit on the output shaft depends on the mass of the chain links and the rotation speed of the driving link. Pinch roller 6 presses the chain to the inner

the surface of the sprocket, after it bypasses the support wheel 5, until it engages with the teeth of the wheel, further, under the influence of Fu6, the chain remains pressed to the surface of the sprocket until it enters into interaction with the support wheel. The pinch roller has an important function in operation, since without it the chain loses contact with the sprocket. In the particular case of the construction, the driven link can be provided with a pressure roller 6 which can be displaced in the circumferential direction relative to the support wheel 5. To enable the pressure roller to be displaced in the circumferential direction, the driven link is equipped with a displacement drive 9, an example of such an output link is shown in FIG. 2. In this case, the lever of the support wheel 7 is rigidly fixed to the output shaft 4, and the lever of the pinch roller 8 is freely mounted on the shaft 4, connected to the shaft by means of an offset drive 9 and has the possibility of angular rotation relative to the shaft 4. An adjustable offset is produced by the offset drive 9, which can be of various types: mechanical (for example, a screw-nut mechanism as in Fig. 2), hydraulic, electromechanical, or another type.

By shifting the pressure roller in the circumferential direction, you can change the amount of torque on the output shaft and pull the chain in stop mode.

In the particular case of execution, the design can have many pressure rollers placed around the circumference, which can be mounted on the driven link or connected in a separate link. Some of the clips can only be used in stop mode. In FIG. 5 shows a design with three support wheels and equipped with three pinch rollers located around the circumference and

interconnected in a separate link.

On reversing variators, for rotation in both directions, the driven link must be provided with pressure rollers 6 located on both sides of the support wheel 5, for example, as in FIG. 5.

In the particular case of the construction, the driven link can be equipped with a support wheel that can be displaced in the radial direction

relative to the shaft of the driven link. In order to be able to perform radial displacement of the support wheel, the driven unit is provided with a guide mechanism and a displacement drive. An example of such an output link with a guiding mechanism is shown in FIG. 3, and in FIG. 4- a special case of the design. In this case, the support wheel 5 is mounted on the carriage in the guide slot 10 made on the lever of the support wheel 7. The carriage is connected to the displacement drive 9 by means of a flexible rod 11 and has the possibility of radial displacement along the slot 10. As an adjustable displacement drive, different drives can be used types: mechanical

(for example, a screw-nut screw mechanism plus a flexible rod, as in Fig. 3 and Fig. 4), hydraulic, electromechanical, or another type. Various types of them can be used as a guiding mechanism, such as: a rectilinear guiding mechanism, an arc guiding mechanism, an articulated guiding mechanism, and others. By shifting the support wheel in the radial direction, you can change the value of Mkr on the output shaft and tension the chain in stop mode.

In the particular case of the construction of the variator, part of the support wheel 5 may protrude beyond the inner perimeter of the sprocket, for example, as in FIG. 4. In this case, the support wheel 5 interacts with that part of the chain 2 that protrudes beyond the upper edge of the chain wheel, or with the link plates, another row of the chain or other protrusions.

A variator equipped with a support wheel with the possibility of radial displacement, which can be completely displaced beyond the inner perimeter of the sprocket, for example as in FIG. 4, can serve as a clutch. In such a variator, the support wheel 5 can be shifted outside the perimeter until it loses contact with chain 2, and when the support wheel 5 is closer to the center, it again interacts with chain 2, which allows the variator to perform the functions of the clutch, this process proceeds smoothly.

A particular embodiment of the aforementioned embodiment is shown in FIG. 6. The driven link is equipped with two support wheels, two pressure rollers and articulated guide mechanisms, a double-row chain. One glad chain interacts with the sprocket, and another row interacts with the support wheels. In this case, the support wheel 5 is mounted on the end of the movable lever 12, which is pivotally connected with the lever of the pressure roller 8 on an axis common with the pressure roller 6. The mobile lever 12 is connected to the bias drive 9 by means of a flexible rod 11 and can be rotated on a hinge, making while radial

displacement of the support wheel 5. As a displacement drive, a screw-nut mechanism is used, which has a thread with a large angle of elevation, when the nut is pressed, it is rotated angularly and the flexible rod is wound onto the reel. When the driving link 1 rotates, pulling the flexible rod 1 1, we move the support wheel 5 closer to the shaft of the driven link, it returns to the periphery under the action of dynamic forces exerted by the chain on the surface of the support wheel. By shifting the support wheel, it is possible to change the value of Mkr on the output shaft and to perform a trip between the drive and driven link of the variator.

In stop mode, to prevent the chain from jumping off the sprocket, the variator can be equipped with a chain stop 13, an example in FIG. 7. When the drive link rotates, the arcuate stops do not touch the chain, as there is a gap between them and the chain. Chain stops can be attached to parts of the driven link or make up a separate link.

To tension the chain, a pinch roller can be used that can be displaced in the circumferential direction. In FIG. 7 shows a variant of the best design of the variator in stop mode, here the pressure roller 6 is displaced counterclockwise and chain 2 is tensioned. In FIG. Figure 8 shows the same construction in rotation mode, here the pinch roller is shifted clockwise and chain 2 is weakened. In the mode of rotation of the variator, producing a circumferential displacement of the pinch roller relative to the support wheel, it is possible, within certain limits, to change the value of Mkr on the output shaft.

The type of chain may be different: sleeve, roller, plate or

combined. On multi-row chains, one of the rows can be lamellar, and the other a sleeve or roller. Also applicable is a multi-row plate chain in which one of the rows is toothed and interacts with the sprocket, and the other row of teeth does not and interacts with the support wheel.

The proposed variator is able to rotate faster than the known transmission, as it operates in a dynamic mode, rather than a pulsed one, and has improved characteristics. It can be used in gears and power take-offs. The variator has reserves of possibilities for modifying the design for a specific gear mechanism. Using the proposed device will expand the arsenal of hardware of this class.

Claims

CLAIM

1. A dynamic variator containing a driving link in the form of a sprocket wheel, an inertial element in the form of an endless chain and a driven link with a support wheel mounted on it, characterized in that in order to expand the arsenal of technical means, the driving link is made in the form of a sprocket of internal gearing, and an endless chain is placed inside the sprocket and interacts with the sprocket on the inside of its circumference.

2. The variator according to claim 1, characterized in that it is equipped with a pressure roller,

pressing the chain to the inner surface of the sprocket.

3. The variator according to claim 2, characterized in that the driven link is provided with a drive for biasing the pressure roller in the circumferential direction.

4. The variator according to claim 1, characterized in that the driven link is provided with a guide mechanism that allows the radial displacement of the support wheel.

5. The variator according to claim 4, characterized in that the radial displacement of the support wheel, until it loses contact with the chain, disengages the driving and driven links.

6. The variator according to claim 1, characterized in that it is equipped with a circuit limiter,

eliminating the chain jumping off the sprocket.

7. The variator according to claim 1, characterized in that it is equipped with a multi-row chain, one row of which interacts with the clutch wheel, and the other row interacts with the support wheel.

SUBSTITUTE SHEET (RULE 26)