|Title of Invention
|The present invention relates to a Rope elevator with an elevator car for accomodating persons and/or goods, at least one guiderail (17) along which the elevator car is guided, a counterweight, a horizontal transverse beam (13) which is fastened to the guiderail (17) via elastic spacing elements (14), suspension means (18) which at one end suspend the elevator car and at the other end suspend the couterweight and which, to raise and lower the elevator car and counterweight, are guided over a traction sheave (6), and an elevator drive which drives the traction sheave (6) and which is supported on the transverse beam.
|The present invention relates to a traction elevator with an elevator drive according to the preamble of Claim 1 consisting of a gear with traction sheave, a motor, a brake, and suspension elements which pass over the traction sheave to impart vertical motion to an elevator car which preferably has a counterweight, the motor of the elevator drive being arranged in an upright position. A traction elevator of this type is known from FR-A-1.521.441.
An elevator drive of the stated type is known from DE 37 37 773 C2. The purpose of this construction is to make it easy to assemble the gear, and to permit rapid mounting and dismounting of the motor, keeping the bearings aligned during the process. The motor, which is arranged in an upright position on top of the gear, has a drum brake at its upper end.
With today's high level of thermal load on the motor windings, the occurrence of a fault in the windings due to an overload appears to be more probable than a mechanical defect in the gear. If a defective motor has to be replaced, the brake on top of the motor also has to be removed together with the defective motor. A prerequisite for this operation is that the car and counterweight must first be secured against unbraked movement, for example by applying clamps to the ropes and/or supporting the counterweight in the hoistway. This procedure is time-consuming and carries the risk of accidents.
The German utility model 1 918 376 discloses an elevator drive consisting of a worm gear and a motor, which is also in an upright position, in which the motor is an external-rotor motor and whose cylindrical external surface simultaneously serves as a brake drum.
with this drive, the brake also has to be removed when the motor is replaced, which gives rise to the same disadvantageous effect as already described above. Furthermore, the large gyrating mass resulting from the external rotor principle can have a negative effect on the acceleration and deceleration of the elevator car.
In both of the drives mentioned, the small size of the motors in relation to the size of the gear leads to the conclusion that these drives are designed only for relatively low power output. If a motor for the medium power range is used which has a higher power output and is therefore larger, the horizontal dimensions of the motor may be greater than those of the gear base, which has negative consequences for the range of possible layouts.
The objective of the present invention is therefore to create an elevator drive whose motor and gear case have narrow dimensions, i.e. in at least one horizontal dimension they are narrow enough for the drive to be located in the side of the hoistway in such a manner as to save space while using a normal shape of motor. Moreover, it must be possible to replace the motor rapidly and easily without the disadvantages stated above.
The elevator drive according to the invention is characterized by the fact that the elevator drive, including the upright motor attached to it, is arranged at a slight inclination to the vertical in such manner that a vertical projection of the motor from above lies within the horizontal boundary of the gear, and that this can be achieved without complex structural modifications.
Advantageous further developments and improvements are stated in the subclaims.
The inclination of the axis of the motor and gear is achieved by the mounting feet of the gear being arranged in a plane which is inclined relative to the base of the gear.
The mechanical brake is positioned between the motor and the gear and does not have to be removed if the motor is replaced. As a result, movement of the drive and traction sheave after the motor has been removed is prevented by the closed brake, and no additional securing measures are needed.
The mechanical brake is constructed as an integral part of the gear and is arranged in a part of the gear case.
The part of the case accommodating the brake is constructed as a flange collar, which faces upwards and has a flange plate to accommodate the motor, and which together with the lower part of the gear is constructed as a monolithic casting.
The vertical cross-section of the gear case, which has an optimized shape similar to an oval for high strength and rigidity, whose curves are constructed from several different radii, and whose height is greater than its width, makes it possible for the gear case to have thin walls and compact dimensions in the horizontal direction.
By positioning a flywheel above the motor it is possible to use a flywheel which projects beyond the cross-section of the motor case without exceeding the dimensions available for installation.
A more detailed description of the invention based on an exemplary embodiment follows below and is illustrated in the drawings. Shown are in
Fig. 1 a three-dimensional view of the elevator drive and its position in the hoistway;
Fig. 2 a vertical cross-section of the elevator drive shown in Fig. 1;
Fig. 3 a front elevation;
Fig. 4 a side elevation; and
Fig. 5 a cross-section of the gear case along the plane V-v in Fig. 2.
Fig. 1 shows an example of the elevator drive according to the invention installed in a hoistway. The elevator drive consists of a gear 2 with a flange collar 8, which faces upwards and has in its sides openings containing the mechanical brake, and a motor 1 mounted above the brake and having a flywheel 9. The mechanical brake consists of a brake drum 5, a brake magnet 3, and brake shoes 4. Through openings in the sides of the flange collar 8, the brake shoes 4 act from outside on the brake drum 5. The flange collar 8 is closed on its upper side by a flange plate 38 onto which the motor 1 is fastened with screws. The gear 2 is detachably fastened by means of mounting feet 10 at the sides to horizontal supports 11, 12 for the gear. A traction sheave 6 with a cover 7 is arranged to the side of the gear 2. Suspension elements 18 are slung over the traction sheave 6 and support a car and a counterweight, neither of which is shown. The gear supports 11 and 12 are positioned on a horizontal transverse beam 13 which is itself connected via elastic supporting pads 14 to the car guide rails 17 and the counterweight guide rails 16. The stated parts 11-14 thereby form a supporting framework for the elevator drive machine. It can also be seen from Fig. 1 that the motor 1 is not arranged
exactly vertically, but at a slight inclination to the vertical and tilting towards the back.
Further details of the elevator drive are explained more fully below by reference to Fig. 2. The active parts of the gear, a worm 20 and a worm wheel 27 which is enmeshed with the worm 20, are installed in an enclosed, oiltight, and approximately rectangular hollow space in the lower part of the gear case 28. The worm 20 is part of a motor/worm shaft 19 which is held radially at its lower end in a fixed bearing 30 and axially in the gear case 28 and guided by a movable bearing 29 at the point where it emerges from the upper part of the gear case 28. The worm wheel 27 is connected to a traction sheave shaft 35 in such manner that the former cannot rotate relative to the latter. This part of the gear case 28 is closed at the right-hand side with a gear cover 31, has an oil drainage screw 32 at its lowest point, and is filled with gear oil 34 up to a level 33. Together with the vipward-facing flange collar 8 and the flange plate 38, this lower part of the gear case 28 is constructed as a monolithic cast case.
On a flat part of the right-hand side of the gear case 28, and adjacent to the flange collar 8, the brake magnet 3 is mounted. A manual brake-release lever for opening the brake by hand is shown on the drawing with number 37. The brake drum 5, which is arranged above the movable bearing 2 9 and inside the flange collar 8, is non-detachably fastened to the motor/worm shaft 19. A motor case 24 of the motor 1 is detachably fastened to the flange plate 38, preferably by means of screws. The motor case 24 surrounds a laminated stator core 23 with a stator winding 22 whose winding ends project at the lower end into the flange collar 8. Located on the motor/worm shaft 19 adjacent to the stator laminations 23 is a rotor 21 with a laminated core and a
short-circuited winding of a type typical for alternating current motors.
A fan wheel 2 5 and a flywheel 9 are attached to the motor/worm shaft 19 close to its upper end in such manner that they cannot turn relative to it, and axially secured with a screw 40. Number 36 indicates a bevel-gear ring which is screwed onto the flywheel 9. The air ventilation opening on the circumference of the fan wheel 25 is covered with a ventilation grille 26. The angle p is the angle of inclination relative to the vertical. The angle of inclination p can be any number of angular degrees that allows the advantages previously mentioned to be obtained. In the example shown, the angle P is approximately 10". The plane of the bottom of the gear case, indicated by number 39, is inclined by the same angle P to the horizontal plane.
In Figure 3 the front elevation shows additional parts of a manually operated evacuation device consisting of a manual operation shaft 44, pivoting clutch mechanism 43, bevel-gear pinion 42, and the bevel-gear ring 36 mentioned above. The oval¬like shape of the gear with the gear cover 31 is also visible.
Fig. 4 shows clearly the advantage of the axis of the motor 1 being inclined to the vertical at an angle p. Because the motor 1 does not project anywhere along its length beyond the base of the gear case, this elevator drive can be placed correspondingly close to a hoistway wall 41, since the extent perpendicular to the plane of the guide rails, and therefore the horizontal dimension of the drive between the hoistway wall and the path of the car, is correspondingly narrow. Furthermore, an elevator car having suspension ropes fastened to its lower part can travel along the car guide rails 17 upwards and to the right of the
elevator drive as depicted in Fig. 4 and beyond the motor 1 of the elevator drive.
Pig. 5 shows a cross-section of the gear case 28 on the plane cutting the gear case 28 marked in Pig. 2. Pig. 5 shows a contour for the case wall which in relation to strength and torsional rigidity is ideal for this gear 2. The height h of the external case contour is greater than the width b. In the example shown, the contour of the gear case, which was calculated using the method of finite elements, has four different radii R1-R4 along its perimeter, but the number of radii which flow into each other can be greater or less than four. This results in the wall of the gear case having a cross-section with a shape similar to an oval. The case wall can also be kept relatively thin, which also has a positive effect on the external dimensions and on the weight of the gear 2.
The detailed manner of constructing the elevator drive is not limited to the example shown. The mechanical brake, for example, can also be implemented as a disk brake with the corresponding mounting parts.
The size and shape of the motor 1 can deviate from the embodiment shown.
WE CLAIM :
1. A rope elevator with an elevator car for accommodating persons or goods, at least one guiderail (17) along which the elevator car is guided, a counterweight, a horizontal transverse beam (13) which is fastened to the guiderail (17) via elastic spacing elements (14), characterized in that it comprises, suspension means (18) which at one end suspend the elevator car and at the other end suspend the counterweight and which, to raise the lower the elevator car and counterweight, are guided over a traction sheave (6), and a elevator drive which drives the traction sheave (6) and which is supported on the transverse beam.
2. The rope elevator as claimed in claim 2, wherein the drive is arranged in a elevator hoistway.
3. The rope elevator as claimed in claim 2, wherein the elevator drive unit is arranged between a hoistway wall (41) and a car travel profile in such manner that the elevator travels beyond and above the motor (1).
4. The rope elevator as claimed in claim 1, wherein an elevator drive with a motor (1) mounted upright on a gear casing (28), the elevator drive being supported above the gear casing (28) on the transverse beam (13).
5. The rope elevator as claimed in claim 4, wherein the elevator drive has a worm gear whose drive shaft (35) is supported horizontally in the gear casing (28) and whose worm shaft (19) with worm (20) is arranged in a plane of rotation of the drive shaft (35) at an acute angle (P to the vertical.
6. The rope elevator as claimed in claim 1, wherein a cover (7) for the traction sheave (6) is present.
|Indian Patent Application Number
|PG Journal Number
|Date of Filing
|Name of Patentee
|SEESTRASSE 55, CH-6052 HERGISWIL,
|PCT International Classification Number
|PCT International Application Number
|PCT International Filing date