SPEED REDUCER

Abstract: It is comprised of a casing -1- obtained in a single block, which comprises a broad opening -2- through which it is possible to mount the different internal elements, among which there is a flange -4- which permits the assembly of a bottom shaft -7- with its pinion -8- and meshing -9-, resting at one end on the bearings -10- and at the other on a bridge -11.- It also includes some coaxial shafts -12-13- resting on the flange -4- and on bearings -14-15-. The shaft -12- is the one that is coup­ led to the motor outlet -16-, while the shaft -13- protudes through the opposite part and constitutes the means for effecting the transmission. The special distribution of the described internal elements permits that none of the gearing is overhanging; in other words, all the shafts have two supports with bearings, determining a greater balance and greater resistance of the unit.

Description: Object of the invention The object of the invention refers to a speed reducer, whose features permit transmission for operation of all types of mechanisms which require a slow operating speed and replaces all conventional elements, with the advantage of taking up very little space and the obtainment of better efficiency. Background of the invention In general lines, a speed reducer has the task of transmission thanks to which the tree or main shaft of a machine, can rotate with a speed lower than the one of the motor tree which moves it. Known reducers go from transmission by belts, in which the pulled pulley has a larger diameter than the drive pulley, up to trnasmission by chain or by gearings. In other cases important reductions are obtained by the use of worm screws or more or less complicated sets of gearing such as the epicyclic train. In any of the known cases, the construction of the reducer has noteworthy complications of the support elements of the gearing, as well as the bothersome noise that they make and in the scarce efficiency which is obtained. The lateral stresses to which the shafts of the gearing are subjected determines the production of play and deformations which are the ones which wear the shafts and gearing producing vibrations and breakage. A known type of two or three stage speed reducer is described in US-A-2,835,138, according to which a casing made of one single piece is close by a cover supporting an input shaft which is opposite to an output shaft supported in the opposite rear wall of the casing. The input and output shafts are coaxilly and simultaneusly supported in a flange fixed to the casing. However, this speed reducer has the disadvantage that, when it is adapted to a two stage reduction, the gear of the intermediate shaft is overhanging whilst, when it is adapted to a three stage reduction, the gears of the intermediate shaft and that of the additional fourth shaft are overhanging. Therefore, the reducer of US-A-2,835,138 has all the aforementioned disadvantages of prior art reducers. Furthermore, the speed reducer of US-A-2,835,138 is disadvantageous in that, to adapt it from two stage to three stage reduction, a rather complex mounting and dismounting of elements attached to the flange must be made. Therefore, US-A-2,835,138 cannot be considered a really satisfactory technical solution of the problems existing in conventional speed reducers. Description of the invention To solve the described problems, the invention proposes the speed reducer which is described, which has the advantages of being a compact unit, with cylindric gearing and coaxial and parallel shafts, occupying very little space with a higher efficiency. To this effect, the reducer comprises a monoblock casing which inside has a special distribution, by which it is obtained that none of the gearings, pinions as well as wheels, are overhanging. For this reason, all its shafts are located between two supports with bearings with a more balanced construction and greater resistance of the reducer unit. The casing is obtained in a single block, which comprises a front mouth dimensioned to this effect, so that through it the different component parts can be assembled, among which stands out a fastening flange with a disk shape provided with a center boring for the shafts of two coaxial gearing and peripheral borings for the anchoring thereof in a seat foreseen inside the casing. This flange has a gap through which the bottom gearing of the reducer can be assembled. Also inside the casing there is a horizontal support for a bearing which permits the assembly of the bottom parallel shaft. The reducer unit is conceived for great versatility by means of coupling the corresponding covers in the entrance of the shaft of the power supply of the motor as well as in the reducer outlet. The reducer offers various possibilities: 1. Two reduction stages 2. Three reduction stages In the first case as well as in the second, different variations are obtained. a) Including the motor and clamp dogs b) With shaft for power supply of a drive shaft and clamp dogs c) With anchoring flange in the casing in the power output surface including a motor (according to paragraph a) without dogs. d) With anchoring flange with shaft outlet for power supply (according to paragraph b) without dogs. For this purpose a series of accessories which in the case of two stages of reduction consisting of the following have been foreseen: 1.- Including a cover for direct coupling between the casing and the motor frame. 2.- Including an anchoring flange in the shaft of power outlet for the incorporation in the wall. For the case of three stage reduction: 1.- Cover of direct coupling which permits the clamping between the casing and the motor frame, foreseeing in this cover the support for the shaft in axial prolongation and for the fourth reducer shaft corresponding to the power inlet. 2.- Including an anchoring flange in the shaft of power outlet for its coupling to the wall. The arrangement of a three stage reducer with a flange and without a motor is also foreseen. In the case of a motor reducer or reducer with flange, two stage as well as three stage ones, the variation of the casing results minimal as far as its outside shape is concerned and it maintains its internal features with the arrangement of the flange and support for the shafts. This arrangement of elements makes it possible to have the shaft of power supply and the outlet shaft in axial prolongation, while the third shaft remains parallel to these two and the fourth one is mounted with the addition of a replacement cover. Description of the drawings For a better understanding of the object of the invention, a set of drawings which represents the speed reducer in different positions and construction and assembly details accompany the present specification. A motor reducer with two stages seen in vertical section is seen in figure 1. The casing -1- corresponds to a reducer with dogs -2- for support on the floor. It is obtained in a single piece and has a big opening -2-, which in the represented case is covered by a cover -3-, through which all of the internal elements can be assembled, such as the flange -4- formed by a circular plate with seat on protusions -5- foreseen in the inside of the casing, whose flange has a gap -6- which permits the assembly of the bottom shaft -7- with its pinion -8- and meshing -9- which at one end rests on the bearings -10- of the casing and on the other end on the bridge -11.- The coaxial shafts -12- and -13- are supported together on the plate -4- by one of the ends thereof and by the other end on the bearings -14- and -15- arranged in the casing -1- and on the cover -3-which covers the opening of the casing, where the motor is coupled by clamping. The gearings -9- and -17-mounted on the shafts are cylindric. The coaxial shaft -13- protudes from the casing to effect the transmission. Figure 2. It represents the cover in a front and sectional view. All around it there is a wing -18- with equidistant borings for clamping thereof to the casing. On the other side there are also flanges for connection to the motor. This cover is replaced in the different versions of the reducer, as has been explained in the description of the invention. Figure 3. It represents the section of a cover -20-which like -3- represented in figure 2, has its wing with equidistant borings for clamping thereof to the casing. In the case the front connection end to the motor has been deleted, as the reducer has to be incorporated at the midpoint between a drive shaft and another driven shaft. This cover is for a two stage reduction reducer. Figure 4. It represents a front raised and sectional view of the plate or flange -4-. In the front view one can see the gap -6- which permits the assembly of the bottom shaft. Figure 5. It shows a front raised and sectional view of the bridge -25- for support of the bottom shaft of the three stage reducer (See figure 6.) Figue 6. It represents a diagram of a three stage reduction motor reducer, with dogs. The only variation with regard to figure 1 is the cover -21- (figure 9) which permits the arrangement of a fourth parallel shaft -22-, with pinion -23-, through which it is meshed with the wheel -24- mounted on the shaft -12-(figure 1.) The nose of coupling to the motor maintains the same features as in the case of the cover of figure 2, and likewise the flange -18- for anchoring to the casing -1-. In this case the nose remains excentric to the flange -18- to permit the arrangement of the cited fourth shaft -22-, with another internal support -25.- Figure 7. This figure represents the diagram of a three stage reduction motor reducer, whose features are idnetical to the one represented in figure 6, except in the exterior flange -26- of the casing, in the surface opposite the motor position, in other words, of the driven shaft outlet -13- for anchoring the reducer to the wall. Figure 8. It shows the casing just as it corresponds to the one of figure 7, where one can clearly see all the internal protusions (figure 1) and the access mouth -2- to the inside which permits assembly of the different elements and the location of the different covers depending on the type of reducer. As can be seen it is obtained in a single piece. The housings -10-11-and -14- for the bearings of the shafts and the protusion -5- for the cover-flange for support of the coaxial shafts are visible therein. The hole -27- for purging the lubricating oil can also be seen in this figure. Figure 9.- It corresponds to different views and sections in physical representation of the cover of a motor reducer with three stages of reduction to which the motor is coupled, as shown in the diagrams of figures 6 and 7. The support -25- (figure 5) is coupled to the rear end -28.- Figure 10.- It corresponds to different views and sections, in physical representation of the cover of the three stage reducer, through which the shaft primary receiver of the power supply in which the nose of coupling to the motor has been suppressed. This cover is mounted on the three stage reducers which have to be incorporated at the midpoint between the drive shaft and other driven shaft. In the inside part it has the end -28- like the cover of figure 9. From what has been described it is understood that from a single monoblock casing a two to three stage reduction reducer is obtained with a multitude of industrial uses, due to the versality given to it by the different elements which can be coupled to the outside as well as to the inside, which permits the coupling thereof between a drive shaft and another driven shaft or directly to the motor.

Claims: Speed reducer which comprises a casing (1) cast in one single piece and a series of shafts (7, 12, 13, 22) bearing reduction gearings (4, 9, 17, 24) and pinions (8, 23) and having an opening (2) in its front surface through which opening (2, 21) there is access to the inside of said casing (1) and which casing is closed by a removable cover (3), whereby an input shaft (12, 22) is supported in said cover (3) while an output shaft (13) is supported in said casing (1) at the opposite end, a series of protrusions (5) for anchoring auxilliary support flanges (4) of said shafts (12, 13), bearings (10, 14, 15) for supporting said shafts (7, 12, 13, 22), said cover (2, 21) supporting one shaft (12) or two shafts (12, 22) of the reducer system depending on whether it is a two or three stage reducer, said flange (4) being plate shaped and having peripheral borings for being anchored by screws on a seat (5) protruding into the inside of said casing (1), said flange (4) having furthermore a central boring for simultaneous support of the ends of said two shafts (12, 13) being positioned in axial prolongation, one of said shafts being said output shaft (13) and the other shaft (12) being a driven shaft, a countershaft (7) having a pinion (8) and a gearing (9) and being parallel to said output shaft (13), characterized in that said flange (4) has a gap allowing said countershaft (7) to pass, said countershaft being supported at its end opposite to the rear wall of said casing (1) in a support provided in the anterior portion of said casing (1) in axial prolongation of said countershaft (7). Speed reducer, in accordance with claim 1, characterized in that the power supply of the motor is effected in the primery shaft directly or by a fourth shaft (22) parallel to the previous ones which mesh into an additional wheel (24) mounted in the original primary shaft, this remaining supported on an auxiliary cover (21) in which, besides, the new shaft is mounted, which transforms into a primary one upon directly receiving the power from the motor. Speed reducer, in accordance with claims 1 and 2, characterized in that in the front rear wall of the casing (1) the arrangement of a flange (26) is foreseen, in the rear part of the casing for anchoring the reducer to the wall, made up of an outside flange with borings for the passing of screws. Speed reducer according to claims 1 and 2, characterized in that said shaft (22) is supported in a support (25) provided at the inner side of said cover (3) at a distance being sufficient to allow said pinion (23) of said shaft (22) to cooperate with said gear (24) of said shaft (12).

Inventors: FENOLLAR MANRIQUE, FRANCISCO, FENOLLAR MANRIQUE, HELENIO
Applicants: FENOLLAR MANRIQUE, FRANCISCO, FENOLLAR MANRIQUE, HELENIO
Application year: 1989
Main classification: F16H1
IPC codes: F16H1, F16H57