Technical Field
[0001] The present invention relates to a traction-type elevator system wherein a hoisting
device is used, and particularly to an elevator system wherein the hosting device
is mounted on a counterweight.
Background Art
[0002] JP 2000 255 932 A discloses an elevator which is capable of reducing the size of a hoistway with respect
to earlier elevators.
[0003] With a view to reduce the required space in the hoistway of an elevator as much as
possible, there have been suggested elevator systems wherein a thin-shaped hoisting
machine that can be housed in the frame body of the counterweight is mounted on the
counterweight. Since hoisting machines to be used in elevator systems of this type
generally require an electric motor which is small in thickness and comparatively
large in capacity, electric motors of the axial gap type or the radial gap type using
a permanent magnet having the rotation axis of the rotor provided on the same axis
as the rotation axis of the drive sheave of the hoisting machine are used. Here, the
electric motor of the axial gap type is provided so that the stator and the rotor
face each other in the direction of the rotation axis of the rotor via an air gap;
and for example, in Japanese non-examined laid-open patent publication No.
Hei 7-137963, an elevator system wherein a hoisting machine using this axial gap type electric
motor is mounted on the counterweight, is disclosed. On the other hand, the radial
gap type electric motor is mounted so that the stator and the rotor face each other
in the direction vertical to the direction of the rotation axis of the rotor via an
air gap; and conventionally, also this radial gap type electric motor has been used
in hoisting machines.
[0004] In an elevator system wherein the hoisting machine is mounted on the counterweight
as above-mentioned, in order to realize an elevator wherein the load of the elevator
car is further increased, e.g. to provide an elevator of large capacity, it is necessary
to enlarge the hoisting machine. Here, in order to enlarge the torque of the electric
motor used in the hoisting machine, as for the axial gap type electric motor, generally
the diameter of the air gap between the stator and the rotor is increased; however,
as a result, the diameter of the electric motor becomes large, and there is a tendency
that also the thickness of the electric motor in the direction of the rotation axis
of the rotor becomes large due to the enlargement of the bearing which supports the
rotor. Accordingly, the external form of the hoisting machine, i.e. the radial diameter
and the thickness of the hoisting machine in the direction of the rotation axis of
the drive sheave of the hoisting machine become large. Also, as for the radial gap
type electric motor, in the case where the torque of the electric motor used for the
hoisting machine is to be increased, generally, the thickness of the rotor and the
stator in the direction of the rotation axis of the rotor are increased. In accordance
with this, the thickness of the hoisting machine in the direction of the rotation
axis of the drive sheave becomes large.
[0005] According to the aforementioned, even if an electric motor of the axial gap type
or the radial gap type is used, in order to increase the torque of the hoisting machine
according to the increase in capacity of the elevator, the hoisting machine will not
fit inside the frame body of the counterweight unless the dimensions of the frame
body of the counterweight are not increased, because of the enlargement of the hoisting
machine. As a result of this, there is a problem that the space required inside the
hoistway is enlarged according to the increase in the area of the horizontal projection
view of the hoistway.
[0006] Furthermore, in the case where one hoisting machine is provided inside the frame
body of the counterweight, in order to make the hoisting machine adapt to the increase
in the capacity of the elevator, hoisting machines of sizes corresponding to each
of the ranges of the capacities of the elevators are needed. Moreover, in order to
make one hoisting machine correspond to small ranges to large ranges of the capacities
of the elevators, it is necessary to standardize the hoisting machine to a large and
costly hoisting machine corresponding to all ranges of capacities, thus making it
meaningless.
[0007] The present invention was devised to solve the above-mentioned problems, and has
as its intension to provide an elevator system capable to cope with increase to large
capacity of the elevator without causing enlargement of the area of the horizontal
projection view of the hoistway, i.e. the space required for the hoistway in a building,
wherein the hoisting machine is mounted on the counterweight in an elevator.
Disclosure of the Invention
[0008] The elevator system in the present invention comprises an elevator car which ascends
and descends through the hoistway, a counterweight which travels in the direction
opposite to the elevator car, and a main rope which suspends the elevator car and
the counterweight; and the elevator car and the counterweight are driven by a hoisting
device around which the main rope is passed. The hoisting machines used in the hoisting
device comprises a drive sheave around which the main rope is passed and an electric
motor which drives the drive sheave to rotate. The hoisting device comprises at least
two of these hoisting machines, and at least one thereof is mounted on the counterweight.
[0009] Also, it is structured so that all the hoisting machines are mounted on the counterweight.
[0010] Furthermore, it is structured so that at least one of the other hoisting machines
of the hoisting device is provided in an upper part of the hoistway.
[0011] According to the aforementioned invention, it is possible to construct an elevator
capable to correspond to the elevator's increase to large capacity without causing
enlargement of the area of the horizontal projection view of the hoistway, i.e. the
space required for the hoistway in a building. Also, it is possible to serialize with
facility elevators of capacities of small ranges to large ranges by simply adjusting
the number of hoisting machines by construction using hoisting machines of the same
specifications.
Brief Description of the Drawings
[0012]
Figure 1 is a diagram showing an example of an arrangement of the elevator system
in accordance with the first embodiment of the present invention;
Figure 2 is a plan view of the elevator system in accordance with Figure 1;
Figure 3 is a diagram showing an example of an arrangement of the elevator system
in accordance with the second embodiment of the present invention;
Figure 4 is a diagram showing an example of an arrangement of the elevator system
in accordance with the third embodiment of the present invention;
Figure 5 is a diagram showing an example of an arrangement of the elevator system
in accordance with the fourth embodiment of the present invention;
Figure 6 is a diagram showing an example of an arrangement of the elevator system
in accordance with the fifth embodiment of the present invention;
Figure 7 is a diagram showing an example of an arrangement of the elevator system
in accordance with the sixth embodiment of the present invention; and
Figure 8 is a diagram showing an example of an arrangement of the elevator system
in accordance with the seventh embodiment of the present invention.
Best Mode for Carrying out the Invention
[0013] To describe the present invention in more detail, the invention will be described
by referring to the accompanying drawings. In each of the drawings, the same numerals
are given to the same parts or the corresponding parts, and repeated explanation will
be appropriately simplified or omitted.
First Embodiment
[0014] Figure 1 is a diagram showing an example of an arrangement of the elevator system
in accordance with the first embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
elevator main rope, being driven to ascend and descend the hoistway by the hoisting
device that is mounted on the counterweight, by expanding the elevation of the elevator
system viewed from the horizontal direction of the hoistway.
[0015] Figure 2 is a plan view of the elevator system in accordance with Figure 1; and in
Figure 2, illustration of the deflector sheave and the main rope is omitted because
the drawing is used mainly as a drawing to explain the arrangement of the hoisting
device mounted on the counterweight and the arrangement of the relation between the
elevator car and the counterweight.
[0016] In Figure 1 and Figure 2, in the hoistway 1, there are provided a pair of guiderails
2 for the counterweight, and another pair of guiderails (not shown) for the elevator
car respectively. The counterweight 3 ascends and descends the hoistway 1 being guided
by the guiderails 2 for the counterweight. The elevator car 4 ascends and descends
the hoistway 1 in the direction opposite to the counterweight 3 being guided by the
guiderails for the elevator car. Furthermore, on the elevator car 4 there are provided
entrance doors 5; and the surface having the entrance doors 5 is treated as the front
face of the car 4. The counterweight 3 is provided between the back face of the elevator
car 4 which is opposite to the front face of the car 4, and the wall surface 1a of
the hoistway 1. The counterweight 3 can also be arranged between either of the side
faces of the elevator car 4 which are orthogonal to the front face of the elevator
car 4, and the wall surface 1a of the hoistway 1.
[0017] Next: a hoisting device 10 around which a main rope 9 is passed and which drives
the elevator car 4 and the counterweight 3 is mounted on the counterweight 3. The
hoisting device 10 is comprised of two hoisting machines 11; and the torque required
for driving the elevator is shared between the two hoisting machines 11. Each of the
hoisting machines 11 has a drive sheave 12 around which the main rope 9 is passed,
and an electric motor 13 which drives the drive sheave 12 to rotate; and the thickness
D in the direction of the rotation axis of the drive sheave 12 is formed so as to
be smaller than the dimension C in the direction of the external diameter.
[0018] Next: the two hoisting machines 11 are mounted inside the frame body of the counterweight
3 which constructs the external form thereof so as to overlap each other not in the
horizontal direction, but in the vertical direction. To describe further, as shown
in Figure 2, generally, the form of the section of the counterweight 3 in the horizontal
direction is short in the direction of the gap between the car 4 and the wall surface
1a; and the counterweight 3 has a long rectangular section in the width direction
of the car 4 and also a rectangular parallelpiped external form which is formed long
in the vertical direction. That is, the counterweight 3 is arranged so as to take
up as little space as possible in the horizontal projection view of the hoistway 1.
Also, the external form of the counterweight 3 is constructed of a frame body; and
a weight for the counterweight is mounted in a lower part of the frame body. In the
counterweight 3 shown in Figure 1 (and in the remaining drawings), illustration of
the weight for the counterweight is omitted; and the external form of the counterweight
3 in the drawings show the external form of the frame body. Accordingly, the hoisting
device 10 in the first embodiment has the two hoisting machines 11 mounted so as to
overlap each other in the vertical direction so that the dimension A (also referred
to as the width A of the counterweight 3 in the present invention) in the longitudinal
direction of the counterweight 3 in the horizontal projection view of the hoistway
1 does not widen. Also, the hoisting device 10 is mounted on the counterweight 3 with
the direction in the thickness of the hoisting machine 11 matching the short-side
direction of the counterweight 3, so that the dimension B (also referred to as the
thickness B of the counterweight 3 in the present invention) which crosses the above-mentioned
dimension A orthogonally does not widen. In the first embodiment, the hoisting device
10 is constructed of two hoisting machines 11 of the same specifications.
[0019] Next: both ends of the main rope 9 are fixed to an upper part of the hoistway 1;
and starting at the upper part of the hoistway 1, one end of the main rope 9 is successively
passed around the two hoisting machines 11, then around the deflector sheave 8 for
the counterweight which is mounted on the counterweight 3 with the intention of increasing
the winding amount of the main rope 9 to the hoisting machines 11, and then rises
and is passed around two upper-hoistway deflector sheaves 7 which are provided in
an upper part of the hoistway 1. Furthermore, the main rope 9 is successively passed
around a pair of suspension sheaves 6 for the car that are provided in a lower part
of the elevator car 4 and rises again; and the other end of the main rope 9 is fixed
to the upper part of the hoistway 1. In the first embodiment of the present invention,
the main rope 9, which is comprised of a plurality of ropes, has only one route, and
is successively passed on around the two hoisting machines 11.
[0020] According to the aforementioned first embodiment, because the hoisting device 10
comprises two hoisting machines 11, it is possible to share the torque required for
driving the elevator between the two hoisting machines 11. Conventionally, in order
to cope with elevators of which the load of the elevator car is further increased,
i.e. elevators of large capacity, it has been necessary to enlarge the hoisting machine
in order to gain the torque necessary for driving the elevator; however, in contrast,
as for the hoisting device 10 in the first embodiment, it is not necessary to enlarge
the external form of each of the hoisting machines 11. Moreover, the two hoisting
machines 11 are mounted inside the frame body of the counterweight 3 so as to overlap
each other not in the horizontal direction, but in the vertical direction. In accordance
with this, as for hoisting machines 11 using an electric motor 13 of the radial gap
type, it is possible to control increase in the thickness D in the direction of the
rotation axis of the drive sheave 12, and it is unnecessary to widen the thickness
B of the counterweight 3. Also, as for hoisting machines 11 using an electric motor
13 of the axial gap type, it is possible to control increase in dimension C in the
direction of the external diameter and the thickness D in the direction of the rotation
axis of the drive sheave of the hoisting machine, so it is unnecessary to widen the
width A or the thickness B of the counterweight 3. Accordingly, by using either type
of electric motor 13 , it is possible to cope with elevators with increased capacity
without enlarging the horizontal projection area of the hoistway.
[0021] Moreover, by adopting two hoisting machines 11 of the same specifications as hoisting
machines 11 of the hoisting device 10, productivity and installability of the hoistingmachines
11 are improved. For this reason, in the case where the capacity of the elevator is
to be further increased, it is possible to cope by increasing the number of hoisting
machines 11 of the same specifications. That is, it is able to serialize with facility
elevators of capacities of small ranges to large ranges by simply adjusting the number
of hoisting machines.
Second Embodiment
[0022] Figure 3 is a diagram showing an example of an arrangement of the elevator system
in accordance with the second embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0023] As shown in Figure 3, in the second embodiment, similarly to the first embodiment,
a hoisting device 10 which comprises two hoisting machines 11 is mounted on the counterweight
3; and the two hoisting machines 11 are mounted inside the frame body of the counterweight
3 so as to overlap each other not in the horizontal direction, but in the vertical
direction. That is, also in this case, two hoisting machines 11 are provided so that
there is no necessity to enlarge the width A or the thickness B of the counterweight
3. The main rope 9 has only one route, and is successively passed on around the two
hoisting machines 11.
[0024] Here, the only difference between the first embodiment and the second embodiment
is the manner that the main rope 9 is passed around the hoisting machines 11 and the
arrangement of the deflector sheave 8 for the counterweight in accordance with the
manner of passing of the main rope 9. That is, while in the first embodiment the deflector
sheave 8 for the counterweight is provided after the main rope 9, of which one end
is fixed at an upper part of the hoistway 1, is successively passed around the two
hoisting machines 11, in the second embodiment, the deflector sheave 8 for the counterweight
is provided between the two hoisting machines 11 which are on the route of the main
rope 9. In this manner, it is possible to select a suitable arrangement location for
the hoisting device 10 according to the situation in setting the hoisting machines
11 on the counterweight 3 by changing the arrangement location of the deflector sheave
8 for the counterweight. The other structures and the motions thereof are the same
as the first embodiment, so the same numerals are given to the same parts or the corresponding
parts, and repeated explanation is omitted.
[0025] Also in the aforementioned second embodiment, the hoisting device 10 is comprised
of two hoisting machines 11; and the torque required for driving the elevator can
be shared between the two hoisting machines 11. For this reason, there is no necessity
to enlarge the external form of each of the hoisting machines 11 to adapt to elevators
of large capacity. Furthermore, the two hoisting machines 11 are mounted inside the
frame body of the counterweight 3 so as to overlap each other not in the horizontal
direction, but in the vertical direction. Accordingly, with a hoisting device 10 using
either the axial gap type or the radial gap type of electric motor 13, it is possible
to cope with elevators with increased capacity without enlarging the horizontal projection
area of the hoistway, because it is not necessary to enlarge the width A or the thickness
B of the counterweight 3.
[0026] In addition to this, the same effects as the first embodiment can be attained.
Third Embodiment
[0027] Figure 4 is a diagram showing an example of an arrangement of the elevator system
in accordance with the third embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0028] As shown in Figure 4, in the third embodiment, similarly to the first and second
embodiments, a hoisting device 10 which comprises two hoisting machines 11 is mounted
on the counterweight 3; and the two hoisting machines 11 are mounted inside the frame
body of the counterweight 3 so as to overlap each other not in the horizontal direction,
but in the vertical direction. That is, also in this case, two hoisting machines 11
are provided so that there is no necessity to enlarge the width A or the thickness
B of the counterweight 3.
[0029] Next: the main rope 9 used in the third embodiment is comprised of two sets of main
rope units 9a and 9b, which are both comprised of a plurality of ropes. One end of
the main rope unit 9a is fixed to an upper part of the hoistway 1; and the main rope
unit 9a is passed around one of the two hoisting machines 11, and stretches to the
upper-hoistway deflector sheaves 7. Then, after being passed around the two upper-hoistway
deflector sheaves 7, the main rope unit 9a is passed on around a pair of suspension
sheaves 6 for the car which are provided below the elevator car 4, and rises again;
and the other end of the main rope unit 9a is fixed to an upper part of the hoistway
1. One end of the other main rope unit 9b is also fixed to an upper part of the hoistway
1; however, next, the main rope unit 9b is passed around the other one of the two
hoisting machines 11. The subsequent route is the same as that of the main rope unit
9a, thus explanation will be omitted. Accordingly, the two sets of main rope units
9a and 9b are equipped in parallel with each other, and are passed around separate
hoisting machines. The other structures and the motions thereof are the same as the
first and second embodiments, so the same numerals are given to the same parts or
the corresponding parts, and repeated explanation is omitted.
[0030] Also in the aforementioned third embodiment , the hoisting device 10 is comprised
of two hoisting machines 11; and it is possible to share the torque required for driving
the elevator between the two hoisting machines 11. For this reason, there is no necessity
to enlarge the external form of each of the hoisting machines 11 to adapt to elevators
of large capacity. Furthermore, the two hoisting machines 11 are mounted inside the
frame body of the counterweight 3 so as to overlap each other not in the horizontal
direction, but in the vertical direction. Accordingly, with a hoisting device 10 using
either the axial gap type or the radial gap type of electric motor 13, it is possible
to cope with elevators with increased capacity without enlarging the horizontal projection
area of the hoistway, because it is not necessary to enlarge the width A or the thickness
B of the counterweight 3.
[0031] In addition to this, the same effects as the first and the other embodiments can
be attained.
Fourth Embodiment
[0032] Figure 5 is a diagram showing an example of an arrangement of the elevator system
in accordance with the fourth embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0033] As shown in Figure 5, in the fourth embodiment, similarly to the third embodiment,
a hoisting device 10 comprising two hoisting machines 11 is mounted on the counterweight
3; and the two hoisting machines 11 are mounted inside the frame body of the counterweight
3 so as to overlap each other not in the horizontal direction, but in the vertical
direction. That is, also in this case, two hoisting machines 11 are provided so that
there is no necessity to enlarge the width A or the thickness B of the counterweight
3. The main rope 9 used also in the fourth embodiment is similar to that used in the
third embodiment, and is comprised of two sets of main rope units 9a and 9b which
are both comprised of a plurality of ropes.
[0034] Here, the fourth embodiment is different from the third embodiment on the point that
a deflector sheave 8 for the counterweight is used on the route of one of the main
rope units 9a. By using deflector sheave 8 for the counterweight in this manner, it
is possible to raise freedom of the fixing position of the main rope 9 in the upper
part of the hoistway 1 in the horizontal direction and the mounting position of the
hoisting machines 11 inside the counterweight 3. The other structures and the motions
thereof are the same as the first and the other embodiments, so the same numerals
are given to the same parts or the corresponding parts, and repeated explanation is
omitted.
[0035] Also in the aforementioned fourth embodiment, the hoisting device 10 is comprised
of two hoisting machines 11; and the torque required for driving the elevator can
be shared between the two hoisting machines 11. For this reason, there is no necessity
to enlarge the external form of each of the hoisting machines 11 to adapt to elevators
of large capacity. Furthermore, the two hoisting machines 11 are mounted inside the
frame body of the counterweight 3 so as to overlap each other not in the horizontal
direction, but in the vertical direction. Accordingly, with a hoisting device 10 using
either the axial gap type or the radial gap type of electric motor 13, it is possible
to cope with elevators with increased capacity without enlarging the horizontal projection
area of the hoistway, because it is not necessary to enlarge the width A or the thickness
B of the counterweight 3.
[0036] In addition to this, the same effects as the first and the other embodiments can
be attained.
Fifth Embodiment
[0037] Figure 6 is a diagram showing an example of an arrangement of the elevator system
in accordance with the fifth embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0038] As shown in Figure 6, in the fifth embodiment, similarly to the first to the fourth
embodiments, a hoisting device 10 comprising two hoisting machines 11 is mounted on
the counterweight 3. However, in the fifth embodiment, unlike in the first to the
fourth embodiments, the two hoisting machines 11 are mounted inside the frame body
of the counterweight 3 so as to overlap each other in the horizontal direction, but
not in the vertical direction. That is, the two hoisting machines 11 are parallelly
provided in the horizontal direction.
[0039] Next: similarly to the second embodiment, the main rope 9 has only one route; and
a deflector sheave 8 for the counterweight is arranged between the two hoisting machines
11 on the route of the main rope 9. One end of the main rope 9 is fixed to an upper
part of the hoistway 1; and the main rope 9 is passed around in the order of: one
of the hoisting machines 11, the deflector sheave 8 for the counterweight, and the
other hoisting machine 11;and then stretches to the upper-hoistway deflector sheaves
7. After being passed around the two upper-hoistway deflector sheaves 7, the main
rope 9 is passed around a pair of suspension sheaves 6 for the car which are provided
below the elevator car 4, and rises again; and the other end of the main rope 9 is
fixed to an upper part of the hoistway 1. The other structures and the motions thereof
are the same as the first and the other embodiments, so the same numerals are given
to the same parts or the corresponding parts, and repeated explanation is omitted.
[0040] According to the aforementioned fifth embodiment, because the hoisting device 10
is comprised of two hoisting machines 11; and it is possible to share the torque required
for driving the elevator between the two hoisting machines 11. For this reason, there
is no necessity to enlarge the external form of each of the hoisting machines 11 to
adapt to elevators of large capacity. Furthermore, compared with the first to the
fourth embodiments, because the two hoisting machines 11 are arranged parallelly in
the horizontal direction, although the width A of the counterweight 3 increases, arrangement
wherein the wasted gap inside the frame body of the counterweight 3 is decreased in
the horizontal direction can be realized. Accordingly, in the case where the number
of hoisting machines are further increased in order to adapt to elevators of large
capacity, it is possible to minimize increase in the dimension E of the vertical direction
of the counterweight 3, and to improve volumetric efficiency with respect to arrangement
of the hoisting machines 11 inside the frame body of the counterweight 3.
[0041] In addition to this, the same effects as the first and the other embodiments can
be attained.
Sixth Embodiment
[0042] Figure 7 is a diagram showing an example of an arrangement of the elevator system
in accordance with the sixth embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0043] As shown in Figure 7, in the sixth embodiment, similarly to the fifth embodiment,
a hoisting device 10 which comprises two hoisting machines 11 is mounted on the counterweight
3; and the two hoisting machines 11 are mounted inside the frame body of the counterweight
3 so as to overlap each other in the horizontal direction, but not in the vertical
direction.
[0044] Next: similarly to the third embodiment, the main rope 9 used in the sixth embodiment
is comprised of two sets of main rope units 9a and 9b which are both comprised of
a plurality of ropes. One end of the main rope unit 9a is fixed to an upper part of
the hoistway 1; and the main rope unit 9a is passed around one of the two hoisting
machines 11, and stretches to the upper-hoistway deflector sheaves 7. Then, after
being passed around the two upper-hoistway deflector sheaves 7, the main rope unit
9a is passed on around a pair of suspension sheaves 6 for the car which are provided
below the elevator car 4, and rises again; and the other end of the main rope unit
9a is fixed to an upper part of the hoistway 1. One end of the other main rope unit
9b is also fixed to an upper part of the hoistway 1; however, next, the main rope
unit 9b is passed around the other one of the two hoisting machines 11. The subsequent
route is the same as that of the main rope unit 9a, thus explanation will be omitted.
Accordingly, the two sets of main rope units 9a and 9b are equipped parallelly with
each other, and are passed around separate hoisting machines. The other structures
and the motions thereof are the same as the first and the other embodiments, so the
same numerals are given to the same parts or the corresponding parts, and repeated
explanation is omitted.
[0045] According to the aforementioned sixth embodiment, the hoisting device 10 is comprised
of two hoisting machines 11; and it is possible to share the torque required for driving
the elevator between the two hoisting machines 11. For this reason, there is no necessity
to enlarge the external form of each of the hoisting machines 11 to adapt to elevators
of large capacity. Furthermore, compared with the first to the fourth embodiments,
because the two hoisting machines 11 are arranged parallelly in the horizontal direction,
although the width A of the counterweight 3 increases, arrangement wherein the wasted
gap inside the frame body of the counterweight 3 is decreased in the horizontal direction
can be realized. Accordingly, in the case where the number of hoisting machines are
further increased in order to adapt to elevators of large capacity, it is possible
to minimize increase in the dimension E of the vertical direction of the counterweight
3, and to improve volumetric efficiency with respect to arrangement of the hoisting
machines 11 inside the frame body of the counterweight 3.
[0046] In addition to this, the same effects as the first and the other embodiments can
be attained.
Seventh Embodiment
[0047] Figure 8 is a diagram showing an example of an arrangement of the elevator system
in accordance with the seventh embodiment of the present invention; and is a conceptual
drawing showing the elevator car and the counterweight, which are suspended by the
main rope, being driven to ascend and descend the hoistway by the hoisting device
that is mounted on the counterweight, by expanding the elevation of the elevator system
viewed from the horizontal direction of the hoistway.
[0048] As shown in Figure 8, similarly to the other embodiments, the hoisting device 10
comprises two hoisting machines 11. However, in the seventh embodiment, one of the
hoisting machines 11 is mounted on the counterweight 3, and the other hoisting machine
11 is provided in an upper part of the hoistway 1 so as to overlap the counterweight
3 when viewed from the vertical direction. That is, this hoistingmachine 11 is provided
above the travel area of the counterweight 3 which ascends and descends being guided
by the guiderails 2 for the counterweight, and between the pair of guiderails 2 ,
which face each other. Accordingly, also in this case, two hoisting machines 11 are
provided so that there is no necessity to widen the width A or the thickness B of
the counterweight 3.
[0049] Next: the main rope 9 used in the seventh embodiment has only one route. One end
of the main rope 9 is fixed to an upper part of the hoistway 1, and the main rope
9 is longitudinally passed on around the two hoisting machines 11, and stretches to
the upper-hoistway deflector sheaves 7. After being passed around the two upper-hoistway
deflector sheaves 7, the main rope 9 is passed on around a pair of suspension sheaves
6 for the car which are provided below the elevator car, and rises again; and the
other end of the main rope 9 is fixed to an upper part of the hoistway 1. The other
structures and the motions thereof are the same as the first and the other embodiments,
so the same numerals are given to the same parts or the corresponding parts, and repeated
explanation is omitted.
[0050] Also in the seventh embodiment, the hoisting device 10 is comprised of two hoisting
machines 11; and it is possible to share the torque required for driving the elevator
between the two hoisting machines 11. For this reason, there is no necessity to enlarge
the external form of each of the hoisting machines 11 to adapt to elevators of large
capacity. Furthermore, the two hoisting machines 11 are mounted inside the frame body
of the counterweight 3 so as to overlap each other not in the horizontal direction,
but in the vertical direction. Accordingly, with a hoisting device 10 using either
the axial gap type or the radial gap type of electric motor 13, it is possible to
cope with elevators with increased capacity without enlarging the horizontal projection
area of the hoistway, because it is not necessary to enlarge the width A or the thickness
B of the counterweight 3.
[0051] In addition to this, the same effects as the first and the other embodiments can
be attained.
[0052] In the above-mentioned embodiments, examples wherein the hoisting device 10 comprises
two hoisting machines 11 are described; however, in the elevator system in the present
invention, the number of hoisting machines 11 does not necessarily have to be two;
and it is sufficient to mount at least one hoisting machine 11 on the counterweight
3, and the remaining plurality of hoisting machines 11 can be either mounted on the
counterweight 3 or provided in an upper part of the hoistway 1. Accordingly, by constructing
the hoisting device 10 using N hoisting machines 11 of the same specifications, it
is possible to cope with elevators of the capacity of N times without increasing the
width A or the thickness B of the counterweight 3. In accordance with this, by adjusting
the number of hoisting machines 11 to be mounted on the hoisting device 10, it is
possible to provide an elevator system with an elevator of capacities of small ranges
to large ranges without enlarging the horizontal projection area of the hoistway 1.
[0053] Furthermore, in the aforementioned embodiments, examples wherein the hoisting device
10 is comprised of two hoisting machines 11 of the same specifications are described;
however, the plurality of hoisting machines can also be of different specifications;
for example, a combination of hoisting machines of different capacities.
Industrial Applicability
[0054] As aforementioned, the elevator system in accordance with the present invention enables
structure of an elevator which can cope with increase in capacity of the elevator
without enlargement in the horizontal projection area of the hoistway, i.e. increase
in the space required for the hoistway in a building. Furthermore, by constructing
the elevator by using a plurality of hoisting machines of the same specifications,
it is able to serialize with facility elevators of capacities of small ranges to large
ranges by just adjusting the number of hoisting machines. Accordingly, the present
invention is useful as an elevator system which is excellent in productivity and installability
and which can cope with increase in capacity of the elevator without eliminating the
merits of an elevator of the space-saving type having a hoisting device mounted on
counterweight.
1. Aufzugssystem mit:
einer Aufzugskabine (4), die sich durch einen Schacht (1) bewegt;
einem Gegengewicht (3), welches sich durch den Schacht (1) in der Richtung entgegengesetzt
zu der Aufzugskabine (4) bewegt,
einem Hauptseil (9), an dem die Aufzugskabine (4) und das Gegengewicht (3) hängen
und
einer Hubeinrichtung (10), um die das Hauptseil (9) gelegt ist und welche die Aufzugskabine
(4) und das Gegengewicht (3) antreibt,
dadurch gekennzeichnet, dass die Hubeinrichtung (10) wenigstens zwei Hubmaschinen (11) mit einer Antriebsrolle
(12), um die das Hauptseil (9) gelegt ist, und einem Elektromotor (13), um die Antriebsrolle
(12) in Drehung anzutreiben, aufweist und dass wenigstens eine der Hubmaschinen (11)
an dem Gegengewicht (3) angebracht ist.
2. Aufzugssystem nach Anspruch 1, dadurch gekennzeichnet, dass alle Hubmaschinen (11) der Hubeinrichtung (10) an dem Gegengewicht (3) angebracht
sind.
3. Aufzugssystem nach Anspruch 2, dadurch gekennzeichnet, dass wenigstens zwei der Hubmaschinen (11) der Hubeinrichtung (10) innerhalb des Rahmenkörpers
des Gegengewichts (3) so angebracht sind, dass sie miteinander nicht in der horizontalen
Richtung, aber in der vertikalen Richtung überlappen.
4. Aufzugssystem nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens eine der verbleibenden Hubmaschinen (11) der Hubeinrichtung (10) in einem
oberen Teil des Schachts (1) vorgesehen ist.
5. Aufzugssystem nach Anspruch 4, dadurch gekennzeichnet, dass wenigstens eine der Hubmaschinen (11), die in dem oberen Teil des Schachts (1) vorgesehen
sind, so installiert ist, dass sie mit dem Gegengewicht (3) in der vertikalen Richtung
überlappt.
6. Aufzugssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Hauptseil (9) sukzessiv um wenigstens zwei der Hubmaschinen (11) herumgelegt
ist.
7. Aufzugssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Hauptseil (9) wenigstens zwei parallel ausgestaltete Gruppen an Hauptseileinheiten
(9a, 9b) aufweist und dass jede der Hauptseileinheiten (9a, 9b) um eine andere Hubmaschine
(11) herumgelegt ist.
8. Aufzugssystem nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass Hubmaschinen (11) von gleichen Spezifikationen als wenigstens zwei der Hubmaschinen
(11) der Hubeinrichtung (10) verwendet werden.