SU904553A1 - Belt drive switching-off mechanism - Google Patents

Description

(54) SWITCHING THE BELT DRIVE MECHANISM

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The invention relates to agricultural machinery and can be used to turn off belt drives of working bodies, such as combine harvesters.

A known mechanism for switching off a belt drive includes a pulling belt pulley 1 mounted on a pivoting lever on the side of the driven branch.

However, this mechanism does not provide a clear and fast shutdown of the V-belt drive, since when the tension pulley is retracted and the belt is loosened, it may be self-jamming in the pulley stream. This is aggravated by the fact that the length of the drive belts varies widely.

Also known is the mechanism for switching off the belt drive, containing a belt; Dushy, driven and tension pulleys, a device for removal of the driven belt from the leading pulley 2.

A disadvantage of the known mechanism is that the device for removing the driven belt branch from the driving pulley does not ensure complete loss of contact between the belt and the pulley, as a result of which the belt wears out.

The purpose of the invention is to increase the reliability of the mechanism.

The goal is achieved by the fact that the device for removing the slave branch of the belt from the driving pulley is provided with a belt clip made in the form of a fixed stop and a movable stop connected by a pull to the tension pulley.

FIG. 1 shows a combine with a belt drive off mechanism, general view; in fig. 2 - shutdown mechanism when the drive is running; in fig. 3 - the same, when the drive is idle; in fig. 4 is a fastening element of the pivot arm (view along arrow A in FIG. 1).

Claims (2)

The switching mechanism 1 (Fig. 1) of the belt drive 2 of the harvester 3 of the combine harvester 4 contains a tension pulley 5 (Fig. 2) mounted on the rotary lever 6 and connected to the clamp 7. The latter is mounted on the driven branch 8 of the V-belt and represents a fixed stop 9, a movable stop 10 located on opposite sides of the belt directly at its descent from the driving pulley 11. The stops 9 and 10 are mounted on the body of the combine 4 (Fig. 1): the first on the bracket 12 (Fig. 2) is adjustable its position relative to the belt 13 by moving oval slots 14 of the bracket; the second is on the axis 15. The movable stop 10 is connected to the thrust 16, the other end of which is attached to the arm 17 of the pivoting lever 6 rigidly mounted on the shaft 18. At the other end of this shaft another lever 19 is also rigidly connected by the thrust 20 to the lever 21, brought into the cab 22 (Fig. 1) driver. The rotary lever 6 is connected with the body of the combine 4 by means of a spring 23 (Fig. 4), the force of which is directed from the belt 13 (Fig. 3). The move to turn off the mechanism is limited by the stop 24 (Fig. 2), and it is kept from self-switching off after the lever 21 passes through a "dead point" with respect to its axis of rotation 25. In the off position shown in FIG. 3, the lever 21 relative to the axis 25, as well as the system of parts 5, 6, 16, 19 and 20, are held by the spring 23 (FIG. 4) and the clip 7 (FIG. 3). Under the leading branch 26 of the belt 13 there is a slider 27, and under the driven 8 - bracket 28. The mechanism works as follows. When turning the rachaga 21 to turn off the lever 6 under the action of the spring 23 (Fig. 4) and remain also only under its influence later, it pulls the tension pulley 5 (Fig. 3) from the driven branch 8 and releases the belt 13 supported by the cramp 28 from tension At the same time, turning the arm 17 t ha 16 moves in the direction of the driving pulley 11, turning the movable stop 10 about the axis 15 clockwise. When the stop 10 touches the driven branch 8 of the belt 13 and presses it against the stop 9, the frictional force between the stops and the belt rotates the clamp and as a result of self-braking, the belt automatically stops. In this case, the force directed along the belt 13, the leading branch 26 of which rests on the skid 27, takes it away from the leading pulley 11, forming a gap B along the span of the arc. When the drive is turned on by turning the lever 21 to the position shown in FIG. 2, the rod 16, turning the support 10 in the counterclockwise direction, disinhibits and releases the belt 13 and the pulley 5 pulls the shaft. The technical and economic effect of the proposal is that due to the elimination of contact and friction between the belt and the drive pulley in the off position of the drive, the reliability and durability of the drive is increased. Claims A belt drive mechanism comprising a belt, a driving, driven and tensioning pulley, a device for retracting the driven belt branch from the driving pulley, characterized in that, in order to increase the reliability of operation, the device for removing the driven belt branch from the driving pulley is provided with a clip belt, made in the form of a fixed stop and a movable stop, connected by a pull to the pulley. Sources of information taken into account during the examination 1.Izakson X. I. Combine harvesters “Niva and“ Kolos. M., “Kolos, 1974, p. 60-62. 2. The patent of France No. 2046198, cl. A 01 D 41/00, 1971. 14 2 f5 2iIk id 27 26  Fig.d