MXPA99006480A - Ac elevator - Google Patents

Abstract

The present invention relates to a cable traction elevator, comprising an elevator actuator having: a gearbox, a helical gear arranged in the gearbox, a worm gear wheel arranged in the gearbox for the purpose of of coupling with the helical gear, the helical gear wheel is mounted on the output drive shaft in order to rotate with the drive shaft, a motor-helical drive shaft connected to the helical gear in order to project out of the box of the gear, a motor having a motor box, and a stator flange connected to the gearbox, and a brake arranged between the motor and the gearbox coupling when the brake is arranged in the gearbox

Description

Cable lift Description The present invention relates to a cable lift with a drive, consisting of a transmission with a drive wheel, a motor, a brake and support members surrounding the drive wheel for vertical movement of the elevator car, preferably with a counterweight, the motor of the elevator drive facing upwards being arranged. DE 37 37 773 C2 discloses an elevator drive of the type mentioned above. As indicated, in this construction the assembly of the transmission is simple and the assembly and disassembly of the motor can be carried out in a short time, the bearings remaining aligned. The engine arranged standing on the transmission has a drum brake in its upper part. With the current high thermal load of the motor windings, it seems more likely that a winding fault will occur due to overload than a mechanical fault in the transmission. If a damaged motor has to be replaced, the brake on top of it must also be removed. To do this, the cab and the counterweight must first be secured against unbraked movements, for example by mounting cable clamps and / or securing the counterweight in the box. This procedure is time consuming and involves accident risks. The German utility model 1 918 376 describes an elevator drive consisting of a helical gear and a motor also arranged upright. The motor is an external armature motor and its cylindrical side surface serves at the same time as a drum brake. With this drive, the brake must also be dismounted in the event of a motor change, which has the same disadvantageous effect as in the case described above. In addition, the large centrifugal mass resulting from the principle of armature outside, can negatively influence the acceleration and deceleration of the elevator car. In the case of the mentioned drives, the reduced size of the motors compared to the size of the transmission, allows to deduce that these drives are only sized for relatively small powers. If a more powerful motor is used and therefore larger for the average power range, the motor plant partially protruding from the transmission surface may require a correspondingly larger space for the drive, which is disadvantageous for the possibilities of provision. Therefore, the present invention aims to create an elevator drive whose dimensions of motor and transmission housing are small, that is to say that at least in a horizontal dimension it has a reduced span, in such a way that the drive can be arranged laterally in the box occupies little space and the usual motor forms can be used. In addition, the motor must be able to be changed quickly and easily without the aforementioned disadvantages. The elevator drive according to the invention is distinguished because the elevator drive with the motor mounted upright is arranged a little inclined with the vertical, so that in the vertical projection from above the motor is within the lateral extension of the transmission, and because this is possible without costly constructive interventions. Advantageous improvements and improvements are indicated in the subclaims. The inclination of the motor-transmission shaft is achieved insofar as the transmission support feet are arranged in a plane correspondingly inclined with respect to the base of the transmission. The mechanical brake is located between the engine and the transmission and it is not necessary to disassemble it in the event of an engine change. Therefore, the drive, or the drive wheel, remains blocked by the closed brake after the motor has been removed, so no additional safety measures are required. The mechanical brake is configured as a fixed component of the transmission and is arranged in a part of the transmission housing. The part of the housing that houses the brake, it is configured as a flange neck facing upwards with a flange plate for mounting the motor and, together with the lower part of the transmission, is configured as a one-piece cast housing. The cross section similar to an oval of the transmission housing, optimized for high strength and rigidity, whose roundnesses are configured by different radii and whose height is greater than its width, enables thin wall thicknesses and thus a reduced lateral extension of the transmission housing. The arrangement of a centrifugal mass above the motor makes it possible to use a disk flywheel, which protrudes from the cross section of the motor housing, without exceeding the mounting dimensions. The invention is explained in more detail below by means of an embodiment shown in the drawings. These show: - Figure 1. A three-dimensional view of the drive and its arrangement in the box. - Figure 2. A vertical section of the drive of Figure 1. - Figure 3. A front view. - Figure 4. A side view. - Figure 5. A cross section of the transmission through the plane V-V of figure 2. Figure 1 shows the elevator drive according to the invention in an example of assembly in an elevator car. The elevator drive consists of a transmission 2 with a neck flange 8 extending upwards, with side openings, and containing the mechanical brake, and a motor 1 with a disk wheel 9 mounted above the motor. The mechanical brake consists of a brake drum 5, a brake magnet 3 and brake shoes. The shoes 4 act on the brake drum 5 from outside through side openings in the flange neck 8. The flange neck 8 is closed at the top with a flange plate 38, on which the motor 1 is screwed. The transmission 2 is detachably connected to horizontal supports 11 and 12 by means of lateral support feet 10. A drive wheel 6 with a cover 7 is arranged laterally with respect to the transmission 2. The drive wheel 6 is surrounded by supporting elements 18, which support a cabin and a counterweight not shown in the drawing. The supports 11 and 12 are located on a horizontal crossbar 13 which is in turn connected via intermediate elastic parts 14 to the car guide rails 17 and to the counterweight guide rails 16. Parts 11 to 14 thus form a console for the elevator drive. In figure 1 it can also be seen that the motor 1 is not arranged exactly vertically, but rather inclined backwards with respect to the vertical. The other details of the elevator drive are explained in more detail below by means of FIG. 2. The active transmission parts, an endless screw 20 and a helical wheel 27 engaged with the worm 20 are mounted in a closed cavity. oil-tight, approximately rectangular, formed in the lower part of a housing 28. The worm 20 is a component of a helical motor shaft 19, which at its lower end is axially and radially fixed in a fixed bearing 30 in the housing 28, and that in the upper outlet of this part of the housing 28 is guided with a free bearing bearing 29. The worm wheel 27 is attached without possibility of rotation to a drive wheel shaft 35. This part of the housing 28 of the transmission, is closed to the right with a cover 31, has in the lowest place an oil drain screw 32 and is filled with gear oil 34 up to a level 33. The lower part of the housing 28, together with the neck of flange 8 extending upwardly with flange plate 38, is configured as a one-piece cast housing. On the right, next to the flange collar 8, the brake magnet 3 is fixed to a flat part of the housing 28. The number 37 indicates a manual ventilation lever for manually releasing the brake. The brake drum 5 is disposed above the free bearing bearing 29 inside the flange neck 8 and is fixedly connected to the helical motor shaft 19. A housing 24 of the motor 1 is removably connected to the motor plate 1. flange 38, preferably by means of screws. The motor housing 24 contains a package of stator plates 23 with a stator winding 22, whose lower ends or winding heads enter the flange neck 8. In the helical motor shaft 19, inside the stator package 23, there is a rotor 21 with sheet package and short circuit winding typical for AC motors. Against the upper end of the helical motor shaft 19, above the rotor 21 a ventilation wheel 25 and a disk wheel 9, fixed axially with a screw 40, are disposed on it and fixedly against rotation. Air around the perimeter of the ventilation wheel 25 is covered with a ventilation grid 26. The angle of inclination with the vertical is indicated by ß. The angle of inclination ß can be any, provided that the mentioned advantages are achieved. In the example shown, the angle ß is approximately 10 °. The plane 39 of the floor of the transmission is inclined with the horizontal the same angle ß. The front view of Figure 3 further shows the manually operated lever 44, the mechanism of oscillation 43 and the conical pinion 42, as well as the conical toothed ring 36 mentioned above of a manual evacuation device. The shape similar to an oval of the transmission can also be observed with the cover 31. In Figure 4 it can be clearly seen the advantage that the motor shaft 1 forms an angle ß with the vertical. Thus, the motor 1 does not protrude from the base of the transmission housing, and this drive can be placed near a wall 41 of the elevator car, since the transverse dimension with respect to the plane of the guide rails, i.e. The extension of the drive between the wall of the elevator car and the profile of the car is correspondingly narrow. In addition, an elevator car suspended on the right side of the elevator drive according to figure 4, can climb along the car guide rails 17 until it exceeds the motor 1 of the elevator drive. Figure 5 shows a cross section of the transmission casing 28 along the plane shown in Figure 2. Figure 5 shows an outline of the optimum casing wall for this transmission in terms of strength and torsional stiffness. The outer contour of the housing has a height h that is greater than the width b. The carcass contour calculated according to the method of the finite elements has in its development, in the example shown, four different radii Rl to R4, the number of steps from one radius to another may be greater or less than 4. In this way, the shape of the cross section of the carcass wall is similar to an oval. On the other hand, the thickness of the wall of the housing can be relatively small, which in turn has a positive effect on the dimensions and weight of the transmission 2. The details of the construction of the elevator drive are not limited to the example shown . Thus, for example, the mechanical brake can also be performed as a disc brake with the corresponding fittings.

The motor 1 may have a different size and shape from the embodiment shown.

Claims (10)

R E I V I N D I C A C I O N S

1. Elevator cable with an elevator drive, consisting of a transmission with a drive wheel, a motor, a brake and support members that surround the drive wheel for vertical movement of the elevator car, preferably with a counterweight, the elevator drive motor oriented upwards, characterized in that the vertical axis of the elevator drive is arranged inclined with the vertical at an angle.

2. Elevator cable with an elevator drive according to claim 1, characterized in that the transmission has a transmission housing with fixing feet arranged on a plane that forms an angle of inclination with the floor plane of the transmission.

3. Elevator cable with an elevator drive according to claim 1, characterized in that the motor, in the vertical projection of the elevator drive, does not exceed the lateral dimension of the transmission. Elevator cable with an elevator drive according to claim 1, characterized in that the brake does not exceed the lateral dimension of the transmission. Elevator cable with an elevator drive according to one of the preceding claims, characterized in that the brake is arranged above the lower part of the transmission inside a flange neck and a flange plate. 6. Cable lift with one drive elevator according to one of the preceding claims, characterized in that the transmission housing, together with its lower part, the transmission floor, the flange neck and the flange plate, is made as a one-piece cast housing. Elevator cable with an elevator drive according to one of the preceding claims, characterized in that the flange neck has lateral openings for the brake shoes. Elevator cable with an elevator drive according to one of the preceding claims, characterized in that the contour of the transmission housing has a height that is greater than the width and because the contour of the housing has a similar shape in its development to an oval. 9. Elevator cable with an elevator drive according to claim 1, characterized in that the elevator drive is arranged in the elevator car. Elevator cable with an elevator drive according to one of the preceding claims, characterized in that a disc flywheel is arranged above the motor.