SU1375891A1 - V-belt variable-speed drive - Google Patents

Abstract

The invention relates to V-belt variators. The purpose of the invention is to increase the efficiency and durability of the belt. In the V-belt variator, there is a cover 15 fixed rigidly on the movable disk 8 of the driven pulley 5 and the cavity 12 with the centrifugal regulator with the quality bodies 13 and with it. The rolling body 13 has a diameter of 3-8 mm., 1 hp. f-ly, 1 ill.

Description

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The invention relates to mechanical engineering and can be used in all sectors of the national economy for infinitely variable revolutions and torque in the drive mechanisms of various machines, including automobiles.

The purpose of the invention is to increase the efficiency and durability of the belt by reducing the pressing force of the moving disc of the driven pulley to the fixed one while reducing the moment of resistance on the driven shaft and increasing its rotational speed.

The drawing shows a diagram of a wedge-mounted variator.

The cuneferine variator contains a drive shaft 1, on which one of the halves 2 of the driving pulley 3 is rigidly fixed. The second half 4 is also connected to the drive shaft 1, but with the possibility of axial movement. The drive pulley 3 is associated with a driven pulley 5 with a V-belt 6 in the form of an endless belt. The driven pulley 5 also consists of two halves 7 and 8 o. Half 7 is rigidly connected with the driven shaft 9, and half 8 is also connected with the driven shaft 9, but with the possibility of axial movement. Movement half 8 constant nn. is pressed against the fixed half 7 by the axial spring 10 o Moving halves 4 and 8 can be brought closer to the fixed halves 2 and 7 or removed from them by means of the centrifugal regulators 11 and 12. The centrifugal regulator 11 tends to press the movable half 4 to the fixed at half 2, with an increase in the revolutions of the drive shaft 1, and the centrifugal regulator 12 tends to move the movable half 2 from the stationary half 7j overcoming the force of the axial spring 10, while increasing the revolutions of the driven shaft 9. These are cavities filled with small balls 13 with a diameter of 3-8 mm, formed by housings 14 and 15, rigidly connected with movable halves 4 and 8, respectively, and bolts 16 and 17, rigidly connected with lead 1 and driven 9 shafts, respectively.

 The V-belt variator works in the following manner.

With a stationary driven shaft 9, the axial spring 10 tends to bring the mobile half 8 closer to the fixed half 7 and displace the V-belt. 6 at the maximum possible radius, and at the same time the V-belt 6 on the drive pulley 3 tends to occupy the minimum possible radius, moving the mobile half 4 away from the stationary half 2 while the drive shaft is stationary. The gear ratio has a maximum value.

When the drive shaft 1 rotates, the balls of the centrifugal regulator 11, under the action of centrifugal forces, tend to increase the axial size of the cavity and that. most press the movable

half 4 to the fixed half 2, creating friction forces between the belt 6 and the pulley 3, which, having exceeded the moment of resistance on the driven shaft 9, begin to rotate the latter. Transfer-.

the exact ratio begins to decrease smoothly under the action of the axial forces of the centrifugal regulator 11, which tend to move the belt 6 to a larger radius,

When the driven shaft 9 rotates, the balls of the centrifugal regulator 12 under the action of the centrifugal forces of the streamer increase the ovule size of the cavity and thereby move the halves apart.

driven pulley 5, breaking the force of the axial spring 10, V-belt

6 at the same time, it tends to occupy a position with a smaller contact radius,

and the gear ratio of the variator decreases until the speed of the driven shaft 9 becomes uniform, and the pressing force of the movable half of the pulley 5 against the stationary one decreases with decreasing moment of resistance on the driven shaft 9 and increasing its speed.

With increasing moment of resistance on the driven shaft 9, its speed

decreases, and the centrifugal forces of the balls of the regulator 12 also decrease, reducing the axial force opposing the axial spring 10, which causes the movable half 8

approach the fixed half

7 and V-belt 6 to occupy a new position with a large radius of contact, increasing the gear ratio of the variator

The proposed V-belt variator allows to increase the efficiency by reducing losses from excessive pressing of the disk halves with an axial spring on the driven shaft due to the force of the centrifugal regulator opposing it. In addition, a decrease in the unit pressure on the belt with an increase in speed significantly increases the service life of the belt.

Claims (1)

1. V-belt variator containing the driving and driven shafts, driving and driving pulleys in the form of moving and stationary disks, the latter being rigidly fixed on the respective shafts, and the moving ones installed on the respective shafts with axial movement, V-belt for interaction with the driving and driving pulleys, centrifugal regulators mounted on the master and slave pulleys and having five 0 5 rolling body, additional disk rigidly mounted on the driven shaft, axial spring with one end for interacting with the additional disk, and with the other with the moving disk of the driven pulley, so that - - the efficiency and durability of the belt v by reducing the force of pressing the driven disc of the driven shaft to the stationary while reducing the moment of resistance on the driven shaft and increasing its speed, it is equipped with a key fixed rigidly on the movable disk of the driven pulley and forming a cavity with it divided by an additional disk in two chambers, of which the rolling bodies of the centrifugal regulator are located in the space between the additional disk and the lid 2o V-belt variator according to claim 1, characterized in that, in order to increase the speed of the variator, the rolling bodies have a diameter of 3-8 mm.