TECHNICAL FIELD
[0001] The present invention relates to an elevator hoisting machine for raising and lowering
an elevator car by means of a main rope.
BACKGROUND ART
[0002] In conventional elevator hoisting machines, a drive sheave being a separate member
from a rotating shaft is fixed to the rotating shaft, which is rotated by a drive
motor. Rope grooves are formed in the drive sheave, and a main rope for suspending
an elevator car is wound around the drive sheave.
[0003] The drive sheave is required to rotate smoothly while constantly bearing the rope
load and generating traction. Hence, it is necessary for the drive sheave to have
sufficient hardness and strength, and to be manufacture precisely. Furthermore, since
a large hoisting torque is transmitted from the drive motor, the drive sheave is fitted
to the rotating shaft firmly by methods including shrink fitting, using keys, etc.
Consequently, conventional drive sheaves are constituted by thick-walled, high-strength
castings, hindering reductions in the size and weight of elevator hoisting machines.
[0004] Furthermore, when using a main rope composed of a steel rope, D/d (drive sheave diameter/main
rope diameter) is required to be equal to or greater than 40 from the viewpoint of
flexibility, etc. , of the steel rope, thereby also enlarging the drive sheave.
[0005] In answer to this, main ropes composed of a synthetic fiber rope have been achieved
in recent years. Since synthetic fiber ropes of this kind have high coefficients of
friction and superior flexibility, it is possible to lower D/d to around 25, making
reductions in the size of the drive sheave possible.
[0006] However, particularly in high-capacity hoisting machines used in large elevator,
since the diameter of the rotating shaft is large, if the diameter of the drive sheave
is reduced, the difference between the diameter of the drive sheave and the diameter
of the rotating shaft is also reduced. In other words, if the diameter of the drive
sheave is reduced to a minimum, the drive sheave becomes thin-walled, making manufacture
and fitting of the drive sheave onto the rotating shaft difficult. Hence, from the
viewpoint of manufacture and assembly, there is a risk that reductions in the size
of the drive sheave, and in turn reductions in the size and weight of the hoisting
machine, will be limited.
[0007] U.S. Patent 5,982,060 discloses elevator machinery in which the elevator motor is integrated as a part
of the elevator machinery so as to produce a very flat and compact machinery.
[0008] JP 09-142761 A shows a hoisting machine for an elevator including a motor which is constructed to
be a synchronous motor, a shaft, a sheath which is attached on the shaft and which
includes a brake disc device. A shaft is mounted in two bearing mounts.
DISCLOSURE OF THE INVENTION
[0009] The invention is defined by the independent claim. The dependent claims are directed
towards preferred embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
Figure 1 is a side elevation showing an elevator hoisting machine according to an
Embodiment of the present invention;
Figure 2 is a perspective showing a construction of a main rope from Figure 1;
Figure 3 is a side elevation showing an elevator hoisting machine;
and
Figure 4 is a side elevation showing an elevator hoisting machine.
BEST MODE FOR CARRYING OUT THE INVENTION
[0011] A preferred embodiment of the present invention will now be explained with reference
to the drawings.
[0012] Figure 1 is a side elevation showing an elevator hoisting machine according to an
Embodiment of the present invention. In the figure, a pair of bearing mounts 2 and
3 are fixed on a base 1. Bearings 4 and 5 are supported in the bearing mounts 2 and
3, respectively, and first and second end portions of a rotating shaft 6 are rotatably
supported by means of these bearings 4 and 5. The rotating shaft 6 is composed of
a carbon steel, for example.
[0013] A main rope winding portion 6a is formed integrally on an intermediate portion of
the rotating shaft 6, a main rope 7 for suspending a car and a counterweight (neither
shown) being wound around the main rope winding portion 6a. A plurality of rope grooves
6b into which the main rope 7 is inserted are disposed on the main rope winding portion
6a. The main rope winding portion 6a is forged during manufacture of the rotating
shaft 6. The rope grooves 6b may be formed by turning, or they may also be formed
by forging. When the rope grooves 6b are formed by forging, the number of manufacturing
processes is reduced and waste material is not generated.
[0014] A drive motor 8 for rotating the rotating shaft 6 includes: a stator 9 fixed to the
base 1; and a rotor 10 mounted to an intermediate portion of the rotating shaft 6.
The rotating shaft 6 is rotated directly by the drive motor 8 without intermediation
by gears.
[0015] A braking device 11 for braking rotation of the rotating shaft 6 includes: a brake
disk 12 rotated together with the rotating shaft 6; and a braking device body 13 for
braking rotation of the brake disk 12. A diameter of a portion of the rotating shaft
6 adjacent to the main rope winding portion 6a is smaller than a diameter of the main
rope winding portion 6a, the brake disk 12 being fixed to the rotating shaft 6 by
being joined to an axial end surface of the main rope winding portion 6a. Furthermore,
the brake disk 12 is fixed to the rotating shaft 6 by means of a plurality of bolts
14 extending parallel to an axial direction of the rotating shaft 6 and engaged in
the end surface of the main rope winding portion 6a.
[0016] Next, Figure 2 is a perspective showing a construction of the main rope 7 from Figure
1. In the figure, an inner strand layer 24 having a plurality of inner strands 22
and filler strands 23 disposed in gaps between these inner strands 22 is disposed
around a core wire 21. Each of the inner strands 22 is composed of a plurality of
aramid fibers and an impregnating material such as a polyurethane or the like. The
filler strands 23 are composed of a polyamide, for example.
[0017] An outer strand layer 26 having a plurality of outer strands 25 is disposed around
an outer circumference of the inner strand layer 24. Each of the outer strands 25
is composed of a plurality of aramid fibers and an impregnating material such as a
polyurethane or the like in a similar manner to the inner strands 22.
[0018] A friction-reducing coating layer 27 for preventing abrasion of the strands 22 and
25 due to friction among the strands 22 and 25 is disposed between the inner strand
layer 24 and the outer strand layer 26. A protective coating layer 28 is also disposed
on an outer circumferential portion of the outer strand layer 26.
[0019] A synthetic fiber rope of this kind has a high coefficient of friction compared to
a steel rope and is superior in flexibility.
[0020] In an elevator hoisting machine constructed as above, since the main rope winding
portion 6a is formed integrally on the rotating shaft 6 without using a separate drive
sheave, the number of parts can be reduced, and the need for shrink fitting and a
key work is eliminated, enabling assembly to be facilitated. Furthermore, the diameter
of the main rope winding portion 6a is minimized, enabling overall reductions in size
and weight.
[0021] An elevator hoisting machine of this kind can be used with a main rope composed of
a steel rope if a sufficient diameter is ensured at the main rope winding portion
6a, but the elevator hoisting machine of this kind is more effective when used with
the main rope 7 composed of the synthetic fiber rope in order to enable reductions
in size and weight.
[0022] Furthermore, since the main rope winding portion 6a is composed of the same material
as the rotating shaft 6, the rope grooves 6b are easily worn if the steel rope is
used. In contrast to this, the rope grooves 6b are less likely to become worn in the
case of the synthetic fiber rope. In addition, since the synthetic fiber rope has
a high coefficient of friction, it is not necessary to provide undercut grooves to
increase friction inside the rope grooves 6b, and from these viewpoints also, the
elevator hoisting machine of this kind is more effective when used with the main rope
7 composed of the synthetic fiber rope.
[0023] Furthermore, since the end surface of the main rope winding portion 6a integrated
with the rotating shaft 6 can be used to mount the brake disk 12, the brake disk 12
can be fixed to the rotating shaft 6 simply and firmly.
[0024] Figure 3 is a side elevation showing an elevator hoisting machine not in accordance
with the present invention. In the figure, a bearing mount 32 is fixed on a base 31.
A bearing 33 is supported in the bearing mount 32, and an intermediate portion of
a rotating shaft 34 is rotatably supported by means of this bearing 33. The rotating
shaft 34 Is composed of a carbon steel, for example.
[0025] A main rope winding portion 34a is formed integrally on a first end portion of the
rotating shaft 34, a main rope 7 being wound around the main rope winding portion
34a. A plurality of rope grooves 34b into which the main rope 7 is. inserted are disposed
on the main rope winding portion 34a.
[0026] A drive motor 35 for rotating the rotating shaft 34 includes: a case 36 fixed to
the bearing mount 32; a stator 37 fixed inside this case 36; and a rotor 38 mounted
to the rotating shaft 34. The rotating shaft 34 is rotated directly by the drive motor
35 without intermediation by gears. Furthermore, in this example, the type of drive
motor 35 used employs a permanent magnet in the rotor 38. A bearing 39 for rotatably
supporting a second end portion of the rotating shaft 34 is held in the case 36.
[0027] A braking device 11 for braking rotation of the rotating shaft 34 includes: a brake
disk 12 rotated together with the rotating shaft 34; and a braking device body 13
for braking rotation of the brake disk 12. The brake disk 12 is fixed to the rotating
shaft 34 by being joined to an axial end surface of the main rope winding portion
34a. Furthermore, the brake disk 12 is fixed to the rotating shaft 34 by means of
a plurality of bolts 14 extending parallel to an axial direction of the rotating shaft
34 and engaged in the end surface of the main rope winding portion 34a.
[0028] Hence, the main rope winding portion 34a may be formed in one end portion of the
rotating shaft 34, effectively enabling an overall reduction in size when the number
of rope grooves 34b is small.
[0029] Figure 4 is a side elevation showing an elevator hoisting machine not in accordance
with the present invention. In the figure, a pair of first and second bearing mounts
42 and 43 are fixed on a base 41. Bearings 44 and 45 are supported in the bearing
mounts 42 and 43, respectively, and a rotating shaft 46 is rotatably supported by
means of these bearings 44 and 45. The rotating shaft 46 is composed of a carbon steel,
for example.
[0030] A main rope winding portion 46a is formed integrally on the rotating shaft 46, a
main rope 7 being wound around the main rope winding portion 46a. A plurality of rope
grooves 46b into which the main rope 7 is inserted are disposed on the main rope winding
portion 46a.
[0031] A drive motor 47 for rotating the rotating shaft 46 includes: a case 48 fixed to
the first bearing mount 42; a stator 49 fixed inside this case 48; and a rotor 50
mounted to an end portion of the rotating shaft 46. The rotating shaft 46 is rotated
directly by the drive motor 47 without intermediation by gears. Furthermore, in this
example, the type of drive motor 47 used employs a permanent magnet in the rotor 50.
[0032] A braking device 11 for braking rotation of the rotating shaft 46 includes: a brake
disk 12 rotated together with the rotating shaft 46; and a braking device body 13
for braking rotation of the brake disk 12. A diameter of a portion of the rotating
shaft 46 adjacent to the main rope winding portion 46a is smaller than a diameter
of the main rope winding portion 46a, the brake disk 12 being fixed to the rotating
shaft 46 by being joined to an axial end surface of the main rope winding portion
46a. Furthermore, the brake disk 12 is fixed to the rotating shaft 46 by means of
a plurality of bolts 14 extending parallel to an axial direction of the rotating shaft
46 and engaged in the end surface of the main rope winding portion 46a.
[0033] In an elevator hoisting machine of this kind, the drive motor 47 is disposed so as
to be overhung outside the pair of bearing mounts 42 and 43. Consequently, this construction
is suitable when a comparatively compact drive motor 47 is used, facilitating further
overall reductions in size such as enabling the base 41 to be made smaller, etc.
[0034] Moreover, in the Embodiment, a gearless type of hoisting machine is shown, but the
present invention can also be applied to a geared type of hoisting machine in which
a driving force from the drive motor is transmitted to the rotating shaft by means
of a speed reduction mechanism.
1. An elevator hoisting machine comprising:
a bearing mount (2, 3, 32, 42, 43);
a rotating shaft (6, 34, 46) rotatably supported in said bearing mount (2, 3, 32,
42, 43), rotation of said rotating shaft (6, 34, 46) raising and lowering an elevator
car by means of a main rope (7);
a drive motor (8, 35, 47) for rotating said rotating shaft (6, 34, 46);
a braking device (11) for braking said rotation of said rotating shaft (6, 34, 46);
and
a main rope winding portion (6a, 34a, 46a) provided with a rope groove (6b, 34b, 46b)
into which said main rope (7) is inserted;
characterized in that:
said main rope winding portion (6a, 34a, 46a) is formed integrally on said rotating
shaft (6, 34, 46);
wherein a rotor (10, 38, 50) of said drive motor (8, 35, 47) is mounted to said rotating
shaft (6, 34, 46), said rotating shaft (6, 34, 46) being driven directly by said drive
motor (8, 35, 47);
wherein first and second end portions of said rotating shaft (6) are supported by
said bearing mount (2, 3), said rotor (10) being mounted to an intermediate portion
of said rotating shaft (6), and said main rope winding portion (6a) also being formed
on an intermediate portion of said rotating shaft (6).
2. The elevator hoisting machine according to claim 1, wherein said braking device (11)
includes a brake disk (12) rotated together with said rotating shaft (6, 34, 46),
and a braking device body (13) for braking rotation of said brake disk (12),
a diameter of a portion of said rotating shaft (6, 34, 46) adjacent to said main rope
winding portion (6a, 34a, 46a) being smaller than a diameter of said main rope winding
portion (6a, 34a, 46a), and
said brake disk (12) being fixed to said rotating shaft (6, 34, 46) by being joined
to an axial end surface of said main rope winding portion (6a, 34a, 46a).
3. The elevator hoisting machine according to claim 1 or 2, wherein said brake disk (12)
is fixed to said rotating shaft (6, 34, 46) by means of a plurality of bolts (14)
extending parallel to an axial direction of said rotating shaft (6, 34, 46) and engaged
in said end surface of said main rope winding portion (6a, 34a, 46a).
4. The elevator hoisting machine according to any one of claims 1 to 3, wherein said
rope groove (6b, 34b, 46b) is formed by forging.
1. Antriebsmaschine für Aufzüge aufweisend:
einen Lagerträger (2, 3, 32, 42, 43);
eine Drehwelle (6, 34, 46), die rotierbar in dem Lagerträger (2, 3, 32, 42, 43) gelagert
ist, wobei eine Rotation der Drehwelle (6, 34, 46) eine Aufzugskabine mittels eines
Hauptseils (7) anhebt und absenkt;
einen Antriebsmotor (8, 35, 47,) zum Rotieren der Drehwelle (6, 34, 46);
eine Bremsvorrichtung (11) zum Bremsen der Rotation der Drehwelle (6, 34, 46); und
einen Hauptseilwicklungsabschnitt (6a, 34a, 46a), der mit einer Seilnut (6b, 34b,
46b) versehen ist, in die das Hauptseil (7) eingesetzt ist;
dadurch gekennzeichnet, dass:
der Hauptseilwicklungsabschnitt (6a, 34a, 46a) integral an der Drehwelle (6, 34, 46)
ausgebildet ist;
wobei ein Rotor (10, 38, 50) des Antriebmotors (8, 35, 47) an der Drehwelle (6,34,46)
angebracht ist, wobei die Drehwelle (6, 34, 46) durch den Antriebsmotor (8, 35, 47)
direkt angetrieben ist;
wobei erste und zweite Endabschnitte der Drehwelle (6) in dem Lagerträger (2, 3) gelagert
sind, wobei der Rotor (10) an einem Zwischenabschnitt der Drehwelle (6) angebracht
ist, und der Hauptseilwicklungsabschnitt (6a) ferner an einem Zwischenabschnitt der
Drehwelle (6) ausgebildet ist.
2. Antriebsmaschine für Aufzüge nach Anspruch 1, wobei die Bremsvorrichtung (11) eine
Bremsscheibe (12), die zusammen mit der Drehwelle rotiert, und einen Bremsvorrichtungskörper
(13), der die Rotation der Bremsscheibe (12) bremst, aufweist,
wobei ein Durchmesser eines Abschnittes der Drehwelle (6, 34, 46) benachbart zum Hauptseilwicklungsabschnitt
(6a, 34a, 46a) kleiner als ein Durchmesser des Hauptseilwicklungsabschnittes (6a,
34a, 46a) ist, und
wobei die Bremsscheibe (12) an der Drehwelle (6, 34, 46) dadurch befestigt ist, dass
diese an einer axialen Endfläche des Hauptseilwicklungsabschnitt (6a, 34a, 46a) angebracht
ist.
3. Antriebsmaschine für Aufzüge nach einem der Ansprüche 1 oder 2, wobei die Bremsscheibe
(12) an der Drehwelle (6, 34, 46) mittels mehrerer Bolzen (14) befestigt ist, die
sich parallel zu einer axialen Richtung der Drehwelle (6, 34, 46) erstrecken und mit
der Endfläche des Hauptseilwicklungsabschnittes (6a, 34a, 46a) in Eingriff stehen.
4. Antriebsmaschine für Aufzüge nach einem der Ansprüche 1 bis 3, wobei die Seilnut (6b,
34b, 46b) durch Schmieden gebildet ist.
1. Machine de treuil d'ascenseur, comprenant :
un support de palier (2, 3, 32, 42, 43) ;
un axe rotatif (6, 34, 46) supporté de manière rotative dans ledit support de palier
(2, 3, 32, 42, 43), la rotation dudit axe rotatif (6, 34, 46) faisant monter et descendre
une cabine d'ascenseur au moyen d'un câble principal (7) ;
un moteur d'entraînement (8, 35, 47) pour entraîner en rotation ledit axe rotatif
(6, 34, 10 46) ;
un dispositif de freinage (11) pour freiner ladite rotation dudit axe rotatif (6,
34, 46) ; et
une partie d'enroulement de câble principal (6a, 34a, 46a) dotée d'une rainure de
câble (6b, 34b, 46b) dans laquelle ledit câble principal (7) est inséré ;
caractérisée en ce que :
ladite partie d'enroulement de câble principal (6a, 34a, 46a) est formée de manière
intégrale sur ledit axe rotatif (6, 34, 46) ;
dans laquelle un rotor (10, 38, 50) dudit moteur d'entraînement (8, 35, 47) est monté
sur ledit axe rotatif (6, 34, 46), ledit axe rotatif (6, 34, 46) étant entraîné directement
par ledit moteur d'entraînement (8, 35, 47) ;
dans laquelle des première et seconde parties d'extrémité dudit axe rotatif (6) sont
supportées par ledit support de palier (2, 3), ledit rotor (10) étant monté sur une
partie intermédiaire dudit axe rotatif (6), et ladite partie d'enroulement de câble
principal (6a) étant également montée sur une partie intermédiaire dudit axe rotatif
(6).
2. Machine de treuil d'ascenseur selon la revendication 1, dans laquelle ledit dispositif
de freinage (11) inclut un disque de freinage (12) qui est en rotation avec ledit
axe rotatif (6, 34, 46), et un corps de dispositif de freinage (13) pour freiner la
rotation dudit disque de freinage (12),
un diamètre d'une partie dudit axe rotatif (6, 34, 46) adjacente à ladite partie d'enroulement
de câble principal (6a, 34a, 46a) étant inférieur à un diamètre de ladite partie d'enroulement
de câble principal (6a, 34a, 46a), et
ledit disque de freinage (12) étant fixé sur ledit axe rotatif (6, 34, 46) en étant
joint à une surface d'extrémité axiale de ladite partie d'enroulement de câble principal
(6a, 34a, 46a).
3. Machine de treuil d'ascenseur selon la revendication 1 ou 2, dans laquelle ledit disque
de freinage (12) est fixé sur ledit axe rotatif (6, 34, 46) au moyen d'une pluralité
de boulons (14) s'étendant parallèlement à une direction axiale dudit axe rotatif
(6, 34, 46) et en prise avec ladite surface d'extrémité de ladite partie d'enroulement
de câble principal (6a, 34a, 46a).
4. Machine de treuil d'ascenseur selon l'une quelconque des revendications 1 à 3, dans
laquelle ladite rainure de câble (6b, 34b, 46b) est formée par forgeage.