CS246628B1 - Adjustable V-belt pulley - Google Patents

Abstract

The invention provides an adjustable V-belt pulley, in which at least two contact surfaces are arranged in a stepped manner on at least one end face of the axially adjustable V-belt pulley discs, while at least one end face of the axially stable V-belt pulley discs has contact surfaces and recesses. The contact surfaces of the axially adjustable discs and the contact surfaces and recesses of the axially stable V-belt pulley discs are in the shape of intermediate circular sectors.

Description

BACKGROUND OF THE INVENTION The invention relates to a variable-pitch variable pitch / pitch / diameter adjustable V-belt pulley for driving variable speed machines, for example for determining resonance curves and tuning resonance systems.

To change the speed of V-belt driven machines, replaceable pulley sets are most often used, which is both handling and storage-intensive. Other solutions use a control electric motor, which is a costly device and requires considerable space for the control electric motor.

There are also known embodiments of adjustable pulleys composed of individual discs in which the change in functional diameter is achieved by means of exchangeable inserts. This requires replaceable insert storage as well as pulley removal and assembly.

In the case of thread-adjustable pulleys, the disadvantage is again the low accuracy of the adjustment of the individual wheels and the easy damage and wear of the threads.

Disadvantages of the prior art adjustable pulleys are eliminated by the adjustable V-belt pulley according to the invention, characterized in that at least one end face of the axially adjustable V-belt pulleys has at least two bearing surfaces stepped with at least one end face of the axially stable pulley wheels. surfaces and recesses.

Changing the pulley's functional diameter is achieved by relative rotation of the adjacent discs, thereby simplifying and facilitating handling when changing the pulley's functional diameter, and eliminating the need for storage of replaceable parts.

Two specific embodiments of the adjustable V-belt pulley and its components are shown in the drawings. 1 shows two different embodiments of the front side of the axially adjustable disc 7 and FIG. 9, FIG. 2 shows two different embodiments of the front side of the axially stable disc 6, reps. 8Fig. 3 shows, in partial longitudinal section, one particular embodiment of an adjustable V-belt pulley in which one wedge surface 11 is arranged on the outermost axially stable disks 6 and two wedge surfaces 11 are arranged on the inner disks T, 8.

Fig. 4 is a partial view P of this particular pulley embodiment unfolded in a plane. Giant. 5 shows another embodiment of an adjustable V-belt pulley in which on each of the disks 6, T ',

8, 2 3 ^e one wedge surface 11.

FIG. 1 shows the front side of one particular embodiment of the axially adjustable disc 7 and FIG. Two pulleys with a wedge surface 11, then the right side face of the inner disc 7 axially adjustable without the wedge face 11. The mating surfaces 2 '2' 2 '3 ^SOU stepped configuration.

They have the shape of annular sectors. However, they may also be of another circular shape (not shown). The disks 2 are provided with rotary-shaped orifices 12 or alternatively a kidney-shaped orifices 12. The number of bearing surfaces 2 »2 '2 affects the number of changes in the pulley's functional diameter.

FIG. 2 is a left side elevational view of one particular embodiment of the axially stable disc 2 and FIG. The pulley with the wedge surface 22 ' ^{in the} right part then shows a view of the front side of the inner axially stable disk 8 without the wedge surface 11.

The bearing surfaces 4 as well as the recesses 5 have the shape of annular sectors. However, they may also be of another circular shape (not shown). The disks 6, 8 are provided with openings 22 of circular shape.

Giant. 3 shows a partial longitudinal section of one particular embodiment of the adjustable V-belt pulleys consisting of a stable axially outermost discs 6 with one wedge surface 11 and the inner axially adjustable disks 2 and ^e with two wedge surfaces 11 and the inner axially stationary disc 8 with two wedge surfaces on the 11th

The wheels 6 are interconnected by two connecting members 14, which serve to fix the position of disks 2, 2 »2 · EEN ^is an axially stationary disks 2, respectively. 8 is connected to the pulley hub 15. The inner axially adjustable disks 2 are shown unevenly rotated relative to the adjacent disks 2, 2, thus having a different axial position and thus a different functional / pitch / diameter, as shown by the position of the equally large line 16 on different diameters in the wedge grooves 11.

The different distances a1, a2, a3 b1, b2, b3 of the stepped bearing surfaces 2, 2 'of the axially adjustable disks 2 ° at the outer edge 10 of the wedge surfaces 11 allow adjustment of six different pulley function / pitch / diameters.

From Fig. 4 it is clearly seen uneven rotation of the inner discs axially adjustable relative to the adjacent axially T_ stable discs 2 2 ^e j Hoz effect the desired change to a functional diameter of the belt pulley. The stepped arrangement of the abutment surfaces 2, 2, 2 of the disks 2 at different distances a1, a2, a3, b1, b2, b3 from the outer edge 10 of the wedge surfaces 11 and the arrangement of the abutment surfaces 4 and recesses 5 on the axially stable disks 6 and . 8 of this particular embodiment.

FIG. 5 is a partial cross-sectional view of another specific embodiment of an adjustable V-belt pulley composed of an outer axially stable disc 2, inner axially adjustable discs 2, inner axially stable discs 8 and an outer axially adjustable disc 9.

On each of the discs 2 & 2 '8, 9, 12- one wedge face of the wheel 6, 2, 2' 2. j ^sum to each other by connecting members 22 »which are used to fix the position of disks 2, 2 '2' 2 J · ^{e <AEN} from the axially stationary blades 6, respectively. 2 is connected to the pulley hub 15. The axially adjustable disks 2, 2 ^are shown rotated relative to adjacent disks 2 '2.

The different functional / pitch / pulley diameter shows the different position of the same-sized line 16 on the different diameter in the wedge groove formed by the wedge faces 11. The different spacing 22, a2, a3 of stepped bearing surfaces 2 '2' 2 of axially adjustable disks 2 The surfaces 11 allow the adjustment of three different functional, (pitch) diameters of the pulley.

The simple change of the functional diameter of the V-belt pulley allows easy and quick change of machine speed without removing the V-belt pulley and without the need to store the exchangeable parts.

Claims (3)

Adjustable V-belt pulley consisting of separate disks, mutually adjustable, connecting members and a hub connected to at least one disk, characterized in that at least one end face of the axially adjustable disks (7, 9) has at least two bearing surfaces (1, 2, 3) stepped arrangement, wherein at least one end face of the axially stable V-belt pulleys (6, 8) are abutment surfaces (4) and recesses (5). Adjustable V-belt pulley according to claim 1, characterized in that the bearing surfaces (1, 2, 3) of the axially adjustable disks (7, 9) and the bearing surfaces (4) and the recesses (5) of the axially stable disks (6, 8) are in the form of annular slices. Adjustable V-belt pulley according to Claims 1 and 2, characterized in that the axially adjustable disks (7, 9) are provided with holes (13) for kidney-shaped connecting members (14).