DE2012732A1 - Control gear with adjustable cone discs - Google Patents

Description

Variable speed transmission with adjustable conical pulleys The invention relates to Variable speed gearboxes with adjustable conical pulleys for symmetrical or cross-section asymmetrical V-belts, with at least one pulley of a pair of pulleys in designed to be adjustable in the axial direction and the other fixed on the transmission axis is arranged.

Variable speed gears of the type mentioned are known. Apart from the axial The adjustable discs are adjustable radially with respect to the other Disc resp. the gear axis is fixed either by wedges or parallel keys or driving pins. The fixation by means of driving pins is carried out with them Aim to keep the gear shaft free of feather keys so that between the disc hub and axle wear and corrosion-resistant bearing bushes as plastic-metal components -can be provided, - the attachment opposed by parallel keys. So if you want to attach such bushings, to a large extent maintenance-free and thus to achieve greater operational reliability, one has previously had the structural effort the attachment of driving pins taken up, apart from the fact that the Fixing of the adjusting disk by parallel keys, which allow an axial adjustment, represents a considerable amount of work.

It is the object of the present invention to remedy this situation, i.e. a transmission of the type mentioned is to be created that with at least the same Performance does not make this structural effort necessary and thus, if applicable. also the well-known possibility of building more wear-resistant and corrosion-resistant Allows bearing bushes of the type mentioned.

This task is solved with a transmission of the type mentioned, the according to the invention is characterized in that the adjustable disc is free is rotatably arranged on the disk pair axis.

With this solution, the loosely mounted tapered pulley half is taken along due to the pressing of the conical pulley half against the partial belt, as a result of the existing V-belt pretension, and it is so common in transmissions for symmetrical as well Can be used for asymmetrical V-belts.

However, it is particularly advantageous when using asymmetrical V-belts be used. Here, the flank contact pressure is about 2 to 2.5 times the Axle load and the belt slip also very low. The torque is fixed over the Wedged V-belt pulley half over one flank side of the V-belt transferred, but this SlankesaanpreEdruck is of the same order of magnitude is supported on an adjusting element via the loosely mounted Kei Iri belt pulley half Both conical disk halves thus act as clutch disk halves, so to speak. Endurance tests have shown that the transmission ratio changes in terms of belt tension and have not changed in terms of temperature compared to the conventional design and the high power transmission, especially the asymmetrical V-belt transmission, is guaranteed.

Thus, all previously known driver connections are omitted, which is a Saving of working time on machining and fitting of the wedges means.

With a 2'COuro-Scop * 'it can be clearly observed during operation, that the loosely mounted disc half is opposite to the firmly wedged disc half lagging by the amount of the V-belt slip at full load by about 0.5 to 0.9%.

It is thus advantageously possible to use such a regulating wheel set to be designed in a maintenance-free version.

The fact that the variable speed gearboxes are maintenance-free increases operational reliability increased to a very significant extent, and experience has shown that it has a service life of to achieve more than 10,000 operating hours. Thus, this aforementioned renewal wins by eliminating the current type of driver connection and by using maintenance-free ones Cans in importance.

The following is a graphic representation of exemplary embodiments the invention explained in more detail.

In this illustration, Fig. 1 shows in section a continuously adjustable Variable speed gearbox with asymmetrical V-belt and FIG. 2 shows another embodiment in section such a transmission.

In Figures 1 and 2, corresponding parts are with the same Numbers denoted.

In the embodiment of FIG. 1, the socket 1 is on the all variable speed gearbox parts are mounted, plugged onto motor shaft 2 (drive shaft). The conical disk 3 with a slightly inclined running surface is fixed by means of a feather key 4 on the socket 1. The conical pulley 5 with a steeply inclined running surface is radially and axially loose by means of a maintenance-free, multi-layer, in the Bore pressed-in socket 5a mounted without a driver connection. the axial Adjustment of the conical disk 5 and thus the stepless adjustment of the barrel diameter of the V-belt 6 between the two conical pulleys 3 and 5 takes place in a known manner Way by means of an adjusting device consisting of a ball bearing 7, which on the one hand is mounted on the hub of the conical disk 5 and on the other hand in the adjusting hub 8.

The adjusting hub 8, which is axially displaceable with a holder 9, but radially is fixed by means of bolts 10 at the fixed point 11, is by means of an adjusting spindle 12 Handwheel 13 operated.

The adjusting spindle 12 supports the adjusting forces by means of ball bearings 14 the socket 1.

In Fig. 2, the same drive control pulley set is shown as in Fig. 1, whereby the transmission is, however, due to the use of other output cone pulley sets distinguish 0 In Sig. 1 there is an output regulating wheel set on the machine shaft 15 attached, in which the conical disk 16 by means of feather key 17 on the socket 18 is wedged. In contrast, the conical disk 19 is pressed into the bore maintenance-free, multi-layer bushing 19a, also radially and axially displaceable stored on the socket 18.

However, this conical disk 19, 1g-its hub is exemplified is designed as a torque curve 19b, by protruding into the torque curve evkurvenwalzen 20 taken in a known manner. The cam rollers 20 are loosely rotatable on the bolt 21 fastened transversely in the socket 18 is supported. The support of the two cam rollers 20 on the torque curve 19b is load-dependent and is used as an automatic belt pre-tensioning device in a known manner, whereby, under previous light pressure the spring 22, the conical pulley 19 pressed against the V-belt and the required belt tension that corresponds to the magnitude of the instantaneous power transfer corresponds to, is generated 0 This load-dependent or torque-dependent clamping device in this case also acts as a driver connection and is not new in this respect.

On the other hand, the arrangement of the parts of the output regulating pulley set acts according to Fig0 2 designed as a friction clutch driver connection when the means Uruckfedern 23 against the V-belt 6 pressed cone pulley 24 on the means Feather key 25 is supported on the socket wedged conical disk 27. The compression springs 23 are held in the abutment 28, which is attached to the Oteck bushing 26. Even here the bore of the conical disk 24 is provided with a maintenance-free, multilayer Bushing 24a lined. This conical disk 24 is loosely rotatable on the socket 26 and axially displaceable without any driver connection.

Only by the pressing force generated by the springs 23 is on the one hand the conical disk 24 taken along and on the other hand the spring force is used 23 mainly, as is known, to generate the necessary V-belt pretension The compression springs 29 can be supported on the abutment 28 in two ways.

a) by means of a thrust bearing or thrust bearing b) by means of a slip clutch 28 By observation during operation (i.e. during the run using a Touro-Strop) it can be clearly seen that both conical disks 5 on the drive side and 24 on the output side 2 exactly by the amount of the V-belt slip from zero to 1%, depending on Load compared to the conical disk 3 or 27, lag behind (or also compared to the Socket 1 or 26 lagging behind), regardless of whether the compression springs 23 by means of axial ball bearings or are supported by means of a slip clutch.

The use of a slip clutch 28 as an abutment 28 Fig. 2 has only the advantage that a part of the torque from the Eegel disk 24 on the socket 26 is transferred.

This type of storage of the conical pulleys has the advantage that drive linkage such as parallel keys, drive pins or the like. Be saved and brings the big one operational Advantage that this V-belt variable speed gearbox as on the output side, completely reliable and maintenance-free with a long service life is.

Long-term searches have confirmed that even with high performance over N = 100 PS the V-belt slip is still below 1% and the V-belt warming up is below the permissible limit, whereby the V-belt has the same long service life has, as with conventional V-belt variable speed drives.

The same construction principle is of course also used for the regulating wheel set Applicable to gearboxes consisting of a fixed disk and a stepless one by changing the center distance adjustable pulley set exist, or on variable speed gears on which a Forced adjustment for both pairs of discs, i.e. provided on all four discs is.

Furthermore, the same principle can also be applied to V-chain drives.

Claims (1)

Claims Regulating variable speed gearbox with infinitely adjustable conical pulleys for V-belts or V-chains with symmetrical or asymmetrical cross-section, whereby at least one disk of a pair of disks is designed to be adjustable in the axial direction and the other is set at least radially on the transmission axis, d a d u r c -h g e k e n n -axial z e i c h.n e t that the adjustable disc (5, 24) is arranged freely rotatable on the disk pair axis (1, 2). .2. Gearbox according to A 1, d a d u r c h g e k e n n n z e i c h -n e t, that the freely rotatable disc (5, 24) inside its hub with a sleeve (5a, 24a) is made of wear-resistant material. 3. Transmission according to A 2, d u r c h e k e n n n z e i c hn e t that the wear-resistant sleeve (5a, 24a) in a manner known per se as a sleeve made of multilayered, corrosion-resistant and maintenance-free metal-plastic components is formed. 4. Transmission according to any one of claims 1-3, d a d u r c h gek e n n z e ich ne t that the disc (24) opposite the freely rotatable disc (5) of the counter-disk pair is also freely rotatable, with between these Disk (24> and the axle on which the disk is mounted) against the disk in axial Direction acting pressure element (27) is arranged0 5. Gear according to A 4, d u r c h e k e n n n z e i c hn e t that the pressure element (23) with the interposition of a slip clutch (28) against the socket (26) or axis is supported. Transmission according to A 4, d u r c h e k e n n n n z e i c hn e t that the Pressure element (23) with the interposition of an axial pressure bearing against the socket (26) or the axle is supported. 7. Gear consisting of a fixed disk and a stepless one adjustable washer pair by changing the center distance, d a d u r c h g e k e n n z e i c hn e t that the axially adjustable disk of the disk pair is freely rotatable, between this disc and the axis on which the disc is mounted, a pressure element acting against the disc in the axial direction is arranged. 8. Transmission according to A 7, d u r c h e k e n n n z e i c hn e t that the pressure element is supported against the axis with the interposition of a slip clutch is. 9. Transmission according to A 7, d u r c h e k e n n n z e i c hn e t that the pressure element with the interposition of an axial pressure bearing against the axis is supported.