SE175675C1 - - Google Patents

Description

Inventors: W S Hoover, and B A Somers The present invention relates to a V-belt transmission, comprising a drive shaft, a pair of pulleys, a scan mounted in the center of each other on the shaft, and the like forming one. a belt pulley, and one on the shaft on the one side of an adjacent pulley part cone-centrally and rotatably arranged housing part, wherein the holies- / eh / or the adjacent pulley part is provided with an axial cradle and the housing part is provided with a radially extending, in the case of the ameln ± axial joint immobile rock saint the adjacent pulley part Sr is provided with a radially extending, the just mentioned radial cradle opposite, towards and from the other pulley part axially displaceable rock.

High-speed electric motors have a much more extensive use as power sources for machines, tools and the like. The Mira fiesta engines and in particular the smaller and holier types work yid:, a single speed and with moderate efficiency. In the event of an overload and a reduction in speed, the engine can be shaken, agitated or even enlarged. For part fall aft the engine e.g. over a. pulley Or, directly connected to the driven machine .Oven the start-up offers something of a problem, -especially when the driven machine has a lot & dry moment of inertia To remedy the .sistnaninda responsibility, one must often arrange a manually maneuverable or some other kind of coupling, said that the motor is connected to the driven machine only when it has assumed its normal: operating speed. Jute rather, thereby solving - the problem, however, is complete, since the great moment of inertia of the driven machine forors.alcar a certain. Engine overload. nar kopp7 Rage. beaten to. Pa. Due to the circumstances mentioned above, it has become rage to use much larger engines that are really required for normal operation of the machine and, of course, this has caused quite insignificant costs.

You already liar. proposed to vary the diameter of the drive belt pulley, e.g. sascan is disclosed in U.S. Pat. No. 2,153,151. According to this patent, hand-operated pulley means are reciprocated back and forth along the shaft in order to vary the depth of penetration of the drive belt, thereby varying the drive belt speed. life .if one has great dexterity can get such a mechanism .to work, it is unusable for precise and .automatic maro3vrering.

Another comparatively usable system involved the use of a heavily spring-loaded pulley member, whereby high belt loads reduced the effective pulley diameter. The system in question Or, however, .satisfactory in vacl refers to the operational nature .and is further adhered to with the nude part .of less satisfactory start-up properties.

The object of the present invention is to obviate the above-mentioned disadvantages and other other armed related disadvantages. Furthermore, according to the invention, the V-belt transmission of a substantially essential output power must create a straight torque range. In addition, the invention provides an automatic clutch arrangement for high-speed, constant-speed motors, which arrangement is required, in order to achieve starting and overload torques, which are considerably higher than the normal operating torque.

These objects are achieved according to the present invention by means of a V-belt transmission, which is essentially marked by the fact that the axially and radially extending cradles form an axially surrounding, annular chamber, the volume of which varies with the displacement of the movable pulley part towards and from the other pulley part. , and -that a liquid means of re- 567— 2— 17 each smaller volume than the maximum of the chamber & volume () eh- freely movable in all directions is infort-in the chamber and. arranged to produce a centrifugal pressure during the rotation of the head, that a pressure is applied to the racliently extending rocks of the chamber, and to raise the radial joint in the chamber when it changes its volume, 1 and for variation of, partly the pillar height of the means and partly the size aiT- • - the pairing marking surfaces on tie had radial cradles, against which the means abuts, in accordance with the position of the movable pulley part in relation to the housing part and for variation of the akienat pressure of the movable rent part with the other pulley part. , whereby the device is so challenged that the pillar height and the impact surfaces are reduced when the movable pulley part is displaced from the housing part, while the pillar height and the impact surfaces are increased when the movable pulley part is displaced towards the bearing part. It is fitting that the floating means consists of a mass of nv mainly sleary balls, nor further ldmpligt that the ballet is fixedly mounted on the shaft I and for rotation together therewith but can avert refuel .sig, that the casing and one of the pulley parts- aro fixedly mounted on the .axle I oak. for rotation together with, drenna.

The present invention is based on the fact that a very smooth, automatic and palletizing, for constant power and variable torque challenge drive can be obtained by pressing. a new salt utilizes a flowable agent in a closed hollow element. By irrigating a flowable means, according to the invention, rigid siclo forces can be controlled and utilized, which provide a variation in the distance between the hot flanges of a V-belt pulley, and thereby vary. the pulley diameter .dvensom the transferred torque. The invention is particularly applicable in connection with engines with constructed speeds and other rake delivery devices, but is limited thereto.

The invention will be explained in more detail below with reference to the accompanying drawing. Fig. 1 is a simplified section through a pulley according to the invention; Fig. 2 is a detailed section through the basic drive system; Fig. 3 shows a detailed genona incision through a typical V-belt pulley, for a V-belt; Fig. 4 is a detailed section through a V-belt pulley: for two V-belts.

Fig. 1 shows the device according to the invention in a simplified form. With. This means that the drive shaft has a motor or similar power source. Denoted by 31 is a fixed pulley part which is wedged on the shaft 30 and on the insole provided with an inclined surface for frictional driving. Denoted by 33 is the second pulley part which is so wedged on the shaft 30 that it is axially displaceable by a straight A-like shaft. A fixed member 32 is wedged on the shaft 30 and also forms a closed housing together with the displaceable pulley part 33. In the case of clips forming a closed means, a flowable means 34 is shown in the position it assumes when the drive shaft rotates with high speed. The movable means -34 presses against the inside of the housing due to the centrifugal force during the rotation of the drive shaft. The means 34 tucks the outer part of the MI into the shaft as well. In particular, the old pulley part 33 can be displaced therein. The pulley part 31 thus shifts. The effective pulley diameter will thus increase, whereby the belt 35 is displaced outwards to a speed of the shaft 30 and the size-corresponding extent of the load. The operation and advantages of the pulley of the present invention may be summarized as follows: 1. At start-up.

When the shaft is stationary, the floating means 34 is in the housing of the housing and the belt 35 rests freely on the pulley parts 31 and 33. Normally, the pulley diameter then arrives. to be loose and the strap 35 tops on a free shaft bearing.

When the feeder is transferred to the centrifugal force to act on the movable means 34, whereby a pressure is exerted against the pulley part 33. Then: the pulley diameter is still comparable But, a large moment of the belt is transmitted, whereby the initiation of loads, ex. . pelvis sagar, hyviar, .excenterpressar eta., are neglected considerably. The distance between the pulley parts will in the meantime be reduced, depending on the effective pulley diameter Ras, as the load on the belt decreases.

It is understood that an initiation of this set allows the engine. quickly assumes worn speeds while still carrying a high torque during commissioning. 2. During normal operation.

When the moment of inertia of the driven device has been overcome, the frictional load of the belt 35 is reduced with the pulley harness and the frail means 34 engaging the centrifugal pressure with the displaceable pulley part. 33 will be sufficient for the denim pulley part to advance against it fixed. the part 31, whereby the pulley diameter is increased and the belt 35 is displaced further away from the shaft 30. During ordinary operating conditions and without stone load variations, the pulley diameter and the belt speed will remain essentially constant. Viet Overload. - Due to the calculable oak Arnim force, which is directed towards the displaceable belt life part 33 of the movable means 34, the load can pa. the engine is regulated very much-grant. If an overload occurs, the belt is automatically and smoothly transferred to operate on a pulley area of reduced, effective diameter, thereby increasing the torque without changing the speed of the drive device. If the full load becomes even -larger, the pulley diameter is reduced: the ether, tilt sift minimum value and the belt will again run freely until it- to overhela: stnin, oen undanrojts.

The advantages indicated above / eh / or come aft are described in detail in the following Aro; a) an automatic shut-off at start-up is obtained; b) full operating speed is reached, automatically before the load is switched on; . c) commissioning - takes place automatically with high starting torque; d) automatic overload protection is obtained; a wide mural & of different reindeer disc diameters is obtained; pendiing, vibration and other imbalance effects are avoided; - pulley diameter and minimum mivarclen • are easy to install; the device is adaptable for double V-belt pulleys.

In Fig. 2, the flowable means is denoted by 1. Delta flowable means are located in the Jett Mile, palate consists of a pulley part 6 and a solid, shell-shaped part 19, ph which pulley part 6 hr. displaceable. Between, these • parts are arranged an 0-ring 3, which prevents the leaching of the means 1, A drive shaft sleeve 8 has fitted on the • ordinary shaft of an electric motor or flake other power source and fixed by means of a welding screw 9. The welding screw 9 • is tightened against wedge 10, which is fitted in a pair of wedges 11 in the motor shaft. The fixed pulley dowels 12 are thus fixed to the shaft sleeve 8 and arranged F a fixed 1-age in pre-ball to the shaft both angularly and axially. The sleeve 8 is forged: a with a middle part 13 of stone diameter, 5. which is accommodated in a groove 14, which lies in the middle of a similar groove 15 in the offset pulley part 6. In the just mentioned grooves a wedge 16 is arranged, which consists of a bearing metal, so that the friction at the displacement of the pulley part 6 must be reduced.

Arranged between the fixed pulley part and the shaft sleeve 8 is a bearing bush 17, on which the V-belt rests, when the V-belt pulley is fringed and does not face any force, but rotates freely. It will be appreciated that the bearing 17 is not as essential in connection with an electric motor as a petrol engine having a normally variable speed.

. A further description • of the drawing at-Fires bast through a description of • a typical shirt for the assembly. The shaft sleeve 8 is held in place and the bearing device 17, which consists of powder metal or is of another suitable design, is pushed onto the shaft sleeve so that it rests against an ... 'shoulder on the central part of the sleeve; 13, Then the fixed pulley part 12 is placed on the sleeve 8, sa. that it abuts the bearing, the bushing 17. The bearing screw 9 is then screwed in .sh softly, a pulley part 12 is fastened to the sleeve 8, Then the slidable pulley part- 6 is skinned to a. part ph shaft sleeve 8, after which the wedge. 16 is inserted into the spare 14, 15, whereby the pulley part G is fastened so as to the shaft sleeve 8, so that the clean pulley parts can be forced into rotation. Then the edge 18 or 18 is deformed, the groove 15 collapses slightly in the spirit, so that the wedge 16 is prevented from sliding out of the groove. Kilsparet 15 Or i sin. inner spirit Vol-- set with a stop 28,, sorn, prevents excessive star displacement nv wedge 16 in this direction.

Then fed and informed. one of the incidentally applicable application and the radiating conditions dependent on a removable means, e.g. shotguns, the interior of the pulley housing; • finally, the solid, spherical halo divider 19 is brought so that it's against the approach ph. axelhylsan 8 ,. each of these housing parts is lased = deist a resilient lasing ring 20, which is allowed to snap into a ring groove 21. The pulley Or now finished is fitted to the drive motor. Fig. 3 shows another embodiment of the pulley according to the invention, especially lam- pad for use of hailstones -as floatable.means, Ingaenie iforsok have shown, aft some material accumulations and unbalanced dynamic -vibrations etc. do not occur cm one uses hailstones of jhanforelsevis small diameter instead of a liquid, thorn a seaweed halogenated oil, mercury, mineral-Gila etc ., and that the floating media consisting of hailstones -Or completely satisfactory. In addition to certain liquid centrifugal impact agents, the above-mentioned medium has the advantages that no O-rings or similar seals are required, that exact weight deficiencies can be more easily corrected, that 'Increased manufacturing costs are achieved and that the ambient temperature does not affect the function'. can further, be applied to the Mien in various forms and in order to generate different centrifugal force effects and pressures to apply lateral displacement forces to the displaceable pulley part during the transmission of force by means of a V-belt transmission with a starting torque range.

All parts shown in Fig. 3 except the shell-shaped part 22 Oor in alit substantially exchangeable with the • parts according to Fig. 2. In addition Or the pulley according to Fig. 3 is provided with two. stop screws 23, 24, which control the displacement of the displaceable pulley part and thus the largest and smallest effective diameter of the pulley. Stop screw 23 Or accessible for installation. by a, burning in the 4— - shell-shaped deIen. 22. It-- appears that the shell-shaped details 22 inside Mar_vinkel- _mot the pulley.s centerline. For spatial requirements, however, Taurus -another inclination angles can come in! Raga, for example 3G0, whereby .a small amount of float- medal leads to -a comparatively star haj.d on the pillar and, thus. .

The stop screw 24 defines the smallest effective diameter of the pulley; .Stop screw SEK 23 inscrutable mar, or less -In a drill hit% 25 in and for pre-installation of belt: - the largest effective diameter of the disc.

Diffuse shovels .40 utgara- a part - of the fixed holjesd.elen 22. NORmalt .a.nordnas Tyra sadana: skovlar vid holjesdelens framstailning. The vanes contribute to the generation of the first turbulence and movement in the movable one. A tension spring 41 is arranged between an anchorage 43 on the housing part 22 and another anchorage 42 on the displaceable pulley part in the direction of the V-belt pulley in the direction of the unloaded starting edge. When the engine is started, the effective diameter of the pulley will have its minimum value and the data instants on. suitable salt ground through the screw _ 24 hammer the V-belt to run on the freely rotating bearing bushing. The traction of the spring is, of course, always considerably less than that. in the opposite direction. acting force from the rotating, flowable media.

In Oa case, one can of course astacikognma a suitable installation -of the pulley, s maximum and minimum diameter, based on pd. Desired maximum power, engine speed, belt dimension, etc.

Fig. 4 shows a double pulley, intended for ordinary V-belts. In this case, all parts are removable against the parts of the pulley according to Fig. 3, except the Ifasta pulley parts. 26 and 27, which are both designed to be integral with the associated shoulder sleeve. The concentricity in the manufacture and in the maintenance of the belt sleeve is maintained by means of a turned annular flange 38. It can be seen that since the cleaning parts 26 and 27 are integral with their shaft sleeves, the flake bearing bushing 17, Fig. 2, cannot be fitted. It must be omitted in the pulley, according to Fig. 4, and is jokingly suitable for electric motor operation.

In this pulley the angle of attack of the shotguns is again 30 ° so that a. However, the first embodiments of smaller shotguns can be used for a pulley of the same diameter on both the offset pulley part and the fixed part, as discussed above.

The nature of the flowable agent has already been mentioned, but it should be noted that shotguns with a diameter of less than about 3 mm in this case are defined as a flowable agent, as well as such materials as hydrocarbon oils, halogenated oils, such as perfluorophantogen , mercury, chlorinated diphenyl, etc., or, other oils, son 'aro continued with heavy pairs, tiklar and lilmande.

The other parts of the pulley can consist of any suitable material, such as steel, castings, pulp, aluminum, plastic and The bearing elements can in practice be made of rolling bearings and the one for reduced friction. arranged Mien can, be replaced by ball bearings.

The invention is not limited to the use in connection with an engine or pulley of a particular size but is limited to the nature of the belt only. When gasoline engines and similar variable vandal power sources are used, it is convenient to provide a freely rotating bearing between the pulley parts.

Claims (2)

T a tentansprak: V-belt, forging, containing eh, drive shaft, a pair of pulley parts, 'sem aro mounted in the middle', meet each other on the shaft, so that they form a V-belt, one on the shaft on one side of an adjacent belt side part, concentrically and rotatably arranged holies part, wherein the holjes and / or the adjacent pulley part Or is provided with an axial cradle and the holies part is provided with a radially flapping, in relation to the shaft in axial direction a rigid rock as well as the 'adjacent pulley part Or is provided with a radially extending, the radial cradle just mentioned, opposite to the other pulley part axially displaceable cradle, can be drawn therefrom, since the axially and radially extending cradles form an axial, unobtrusive, annular hammer (2), the yarn of which is varied, at the rag the displacement of the pulley part (6) towards and frail the second pulley part (12), and that a floating medal (1) of considerably smaller volume than the maximum volume of the chamber (2) and freely moving in another direction ar Or entrance into the chamber and arranged .at at holj, esd.elens (19) rotation generate a centrifugal pressure, so that, a pressure is exerted against the radial folio of the chamber: panda rocks, and to shark and sink In the radius led in the chamber, aren , when this changes its volume, i and 'for variation of partly the medium p, elar height and partly the size of the impact surfaces on the two radial cradles, against which the medium' abuts, in accordance with the layer of the rare pulley part (6) in relation to the housing part (19) in order to vary the axial of the movable pulley part. pressure against the second pulley part, the device being so challenged that the column height and the bearing surfaces are reduced while the movable pulley part (6) is displaced from the housing part - - (19) while the pillar height and the bearing surfaces are increased when the movable pulley part (6) is displaced towards the housing part (19) ). V-belt transmission, according to claim 1, characterized in that the liquid means consists of a mass (1) of substantially spherical spheres. V-belt transmission according to claim 1, characterized in that the housing (19) is fixedly mounted on the shaft (30) for rotation together with. derma. V-belt transmission according to claim 1, characterized in that the housing (19) and the single pulley part (12) are fixedly mounted on the shaft for rotation together with: this. Request publications; Patents to Great Britain 591 355; U. S. A. 2 336 973, 2 553 505, 2 715 84 2. Stockholm 1961. Kungl. Boktr. P. A. Norsteclt & & incr. 610089