Elevator hoisting machine

Abstract

To provide a hoisting machine for an elevator having a housing excellent in resistance to a fixing part where stress is concentrated, without increasing the size and weight of the hoist itself.SOLUTION: A housing that rotatably supports a sheave includes a generally cylindrical central storage section having a front wall section and a rear wall section between which the components of the permanent magnet synchronous motor are arranged, and an outer frame section that supports the central storage section with a frame-like structure that extends integrally from the central storage section to the outer periphery. The outer frame section has a generally rectangular outline shape that can also be installed in a lying state rotated 90 degrees clockwise or counterclockwise with respect to the front placement of the housing, and includes plate-like sections located at both left and right end areas of the upper and lower surfaces that are parallel to each other, and support sections that extend upward or downward from the front wall section and the rear wall section along the vertical sides of the generally rectangular parallelepiped to support each plate-like section at the front and rear.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a traction-type elevator hoist, and more specifically, to a thin, gearless type equipped with a permanent magnet synchronous motor whose rotor is a permanent magnet, which can be installed either above, below or sideways within the hoistway, and has a housing shape with excellent tensile strength. [Background technology]

[0002] In recent years, elevators designed to save space and without a machine room have become popular for passenger elevators with a relatively slow ascending and descending speed. In such machine room-less elevators, the hoist and control device for raising and lowering the car are installed inside the hoistway. The hoist can be installed in the upper part of the hoistway, the lower part, or horizontally between the car and the hoistway wall in the middle of the hoistway, but a gearless and thin type is usually used.

[0003] A thin traction machine is a compact machine that integrates the rotor, sheave, and brake drum. In many cases, a permanent magnet synchronous motor is used, which is more energy efficient and saves more energy than an induction motor, and this allows the car to rise and fall quietly and smoothly.

[0004] Permanent magnet synchronous motors are classified as AC motors that use alternating current and can be started with a commercial power source, and have a permanent magnet in the rotor, and are generally called PM (Permanent Magnet) motors. PM motors are designed so that no secondary current flows through the rotor, as in induction motors, so no loss occurs in the rotor, making them energy-saving and highly efficient motors. PM motors can also be used to improve the efficiency of the entire elevator system by using an inverter control method.

[0005] The general configuration of a thin hoist equipped with a PM motor, as disclosed in Patent Document 1, for example, is such that a rotor core made of a cylindrical magnetic material is rotatably fitted into a housing that contains the stator that constitutes the PM motor, and a sheave around which the main rope connected to the car is wound is integrally formed with the rotor core, so that the sheave rotates together with the rotor core.

[0006] Specifically, inside the housing, the stator and stator windings that make up the motor are housed in the outer peripheral area of ​​the main shaft that extends inward from the center of the rear surface of the housing. A sheave and a rotor core on its outer periphery are integrally formed on the tip side of the main shaft, and multiple permanent magnets are fixed to the inner peripheral surface of the rotor core facing the stator, constituting the rotor of a permanent magnet synchronous motor. The housing is manufactured by forming the rough shape from cast iron or the like, and then machining only the parts that require dimensional accuracy. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2012-153486 A Summary of the Invention [Problem to be solved by the invention]

[0008] The above-mentioned thin hoist for machine room-less use is fixed to a structure in the hoistway, and some of them, including the one in Patent Document 1, are horizontally placed between the hoistway wall and the car at the mid-height position of the hoistway. In addition, there are also cases where they are placed on top of the hoistway or on the bottom of the hoistway in an underground pit space at the bottom. Conventionally, in either installation location, it is common to abut the flat surface of the bottom of the housing on the installation surface and screw the left and right ends of the housing with bolts.

[0009] When placed on top or on its side, the entire load, including the car and the counterweight, on the hoisting machine's housing is directed downward via the main rope wound around the sheave, which coincides with the direction in which the housing is fixed. Therefore, the entire load is stably supported by the entire bottom surface of the housing, and the fixed state is also stable.

[0010] However, in the case of bottom mounting, the load is applied in an upward pulling direction via the main rope wound around the sheave of the casing from below. Therefore, tensile stress is concentrated on the bolt fixing part at the bottom of the casing, and if the tensile strength or thickness of this fixing part is insufficient, it will not be able to withstand the stress concentration, and there is a risk that the area around the screw hole will break and the casing will come off the installation surface. In particular, among small hoists for machine room-less applications, the stress concentration on the fixing part will be very large in types with a sheave diameter of 500 mm and a relatively large axial load.

[0011] In response to this, one could first consider increasing the thickness of the walls that make up the housing to improve its strength. However, in this case, the width dimension of the housing itself would increase and the weight of the hoist itself would also increase, making this undesirable for a space-saving, compact hoist that does not require a machine room.

[0012] In view of the above problems, the present invention has an object to provide an elevator hoist that can be placed vertically or horizontally in a machine room-less hoistway, without increasing the size and weight of the hoist itself, and that has a casing with excellent resistance to fixed parts that experience stress concentration due to an upward pulling force, particularly when placed on the bottom. [Means for solving the problem]

[0013] In order to achieve the above object, the elevator hoisting machine according to the invention described in claim 1 is a traction type elevator hoisting machine including a sheave around which a main rope is wound, the main rope suspending a car and a counterweight at both ends of the sheave, a permanent magnet synchronous motor housed in a housing for driving and rotating the sheave, and an electromagnetic drum brake for stopping the rotational drive of the sheave, the housing includes a substantially cylindrical central storage section having a front wall section and a rear wall section that face each other and between which components of the permanent magnet synchronous motor are disposed, and an outer frame section that is a frame-like structure that extends integrally from the central storage section to an outer circumferential region and supports the central storage section, the outer frame portion has a contour shape of a substantially rectangular parallelepiped that allows the housing to be placed sideways and rotated 90 degrees clockwise and counterclockwise with respect to an upright position of the housing, the central storage section includes a fixed main shaft supported in a one-handed manner from the rear wall section toward the interior front, the fixed main shaft rotatably supporting a cylindrical rotor frame at its tip via a bearing, and a stator and a stator winding of the permanent magnet synchronous motor are disposed on the outer circumferential region of the fixed main shaft, a circular opening penetrating the front wall section is formed in the front wall section, and the cylindrical rotor frame is rotatably fitted into the circular opening, The rotor frame has a plurality of permanent magnets of the permanent magnet synchronous motor fixed to its inner circumferential surface so as to face the stator, and the sheave is integrally formed coaxially on the front side of the rotor frame so as to rotate together with the sheave, the housing has a bilaterally symmetrical shape with respect to a vertical plane including a center line of the fixed main shaft, The outer frame portion has plate-like portions located at both left and right end regions of an upper surface and a lower surface that are parallel to each other, and support portions extending upward or downward from the front wall portion and the rear wall portion along vertical sides of the approximately rectangular parallelepiped to support each plate-like portion at the front and rear, Each of the plate-shaped portions has a flat outer surface which forms the outermost peripheral surface of the hoist, and is characterized in that it has one or more screw holes drilled therein for screwing the plate-shaped portions to the contact surface on which the housing is installed.

[0014] The elevator hoisting machine according to the invention recited in claim 2 is the elevator hoisting machine recited in claim 1, characterized in that the housing is made of ductile cast iron.

[0015] The elevator hoist of the invention described in claim 3 is an elevator hoist of claim 1 or 2, characterized in that the electromagnetic drum brake is installed on both left and right outer surface portions symmetrical with respect to the vertical plane of the outer frame portion, and is provided with a pair of electromagnetic brake devices that apply braking to the rotor frame inside the central storage portion.

[0016] The elevator hoisting machine according to the invention recited in claim 4 is the elevator hoisting machine recited in claim 1 or 2, wherein a gear is integrally formed between the rotor frame and the sheave, The central storage section is characterized in that a torque wrench engagement opening is formed in the upper central position of the front wall, into which a torque wrench is inserted so as to be able to engage with the gear.

[0017] The elevator hoist of the invention described in claim 5 is an elevator hoist of the invention described in claim 1 or 2, characterized in that the rotor frame has at least one groove running around the entire circumference, closer to the front than the braking surface of the electromagnetic drum brake on the outer circumferential surface, serving as an oil tank for collecting oil from the sheave side and preventing it from entering the braking surface.

[0018] The elevator hoist of the invention described in claim 6 is an elevator hoist of the invention described in claim 1 or 2, characterized in that the central storage section has an exhaust port formed in a support wall section supporting the fixed main shaft of the rear wall section, for discharging lubricating oil leaking from the bearing to the outside of the housing.

[0019] The elevator hoist of the invention described in claim 7 is characterized in that, in the elevator hoist of claim 1 or 2, the central storage section has a central upper surface exposed between the plate-shaped portions in both the left and right end regions of the upper surface of the outer frame section, and a plurality of cooling fins are integrally protruded from the central upper surface. Effect of the Invention

[0020] In the elevator hoist of the present invention, the housing on which the sheave is rotatably supported is composed of a substantially cylindrical central storage section that stores a permanent magnet synchronous motor that drives the sheave to rotate, and an outer frame section that supports the central storage section with a frame-like structure that extends integrally from the central storage section to the outer periphery, the outer frame section has a substantially rectangular outline shape, and the housing can be installed in a state in which it is rotated 90 degrees clockwise and counterclockwise with respect to the upright position of the housing, and the housing is fixed to the installation surface with screws by the plate-like parts provided at both left and right end regions of the parallel upper and lower surfaces. Therefore, by making each plate-like part appropriately thick while reducing the weight due to the frame-like structure of the outer frame section, it is possible to obtain an effect that the resistance to the tensile stress concentrated on the fixing part, especially when it is placed on the bottom, is sufficiently excellent. Moreover, since it is possible to select not only the basic installation state of upright placement, but also the sideways placement rotated 90 degrees, it can be installed in various places in the hoistway in a direction according to the area of ​​the installation area.

[0021] In addition, since the outer surface of each plate-shaped part in the present invention, which is the outermost peripheral surface of the hoist, is flat, the housing can be fixed by screws to the lower plate-shaped part, and at the same time, the steel material (steel frame) of the structure of the hoistway can be abutted against the surface of the upper plate-shaped part to hold the housing down, which can particularly resist upward tensile loads. Furthermore, when placed on its side, the housing can be firmly fixed by sandwiching it between the steel materials on the left and right. This avoids the risk of the housing becoming detached, and the housing can be maintained in a more stable fixed state, ensuring high safety. [Brief description of the drawings]

[0022] [Figure 1] 1A and 1B are schematic configuration diagrams of an elevator hoisting machine according to one embodiment of the present invention, in which (a) is a front view and (b) is a perspective view. [Diagram 2] FIG. 2 is a plan view of the elevator hoisting machine of FIG. 1. [Diagram 3] 2A and 2B are side views of the elevator hoisting machine of FIG. 1, where (a) is a left side view and (b) is a right side view. [Figure 4]2A and 2B are perspective views showing the elevator hoisting machine of FIG. 1 with the electromagnetic brake device on the left side removed as viewed from the front, where (a) shows the entire housing and (b) is a partially enlarged view of the vicinity of the wrench insertion opening of (a). [Diagram 5] FIG. 2 is a schematic vertical cross-sectional view of the elevator hoisting machine of FIG. 1. [Figure 6] 2A and 2B are schematic front views showing the elevator hoist of FIG. 1 in different installation orientations. In comparison with the upright installation state shown in FIG. 2A, FIG. 2B is a diagram showing a state in which the elevator hoist of FIG. 1 is rotated 90 degrees clockwise and laid down, and FIG. 2C is a diagram showing a state in which the elevator hoist of FIG. 1 is rotated 90 degrees counterclockwise and laid down. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The traction type elevator hoist of the present invention is a hoist equipped with a sheave around which a main rope is wound, which suspends a car and a counterweight at both ends, a permanent magnet synchronous motor housed in a housing for rotating and driving the sheave, and an electromagnetic drum brake for stopping the rotation and driving of the sheave, the housing is equipped with a substantially cylindrical central storage section having a front wall section and a rear wall section which face each other and between which components of the permanent magnet synchronous motor are arranged, and an outer frame section which supports the central storage section with a frame-like structure extending integrally from the central storage section to an outer circumferential area, the outer frame section having an outline shape of a substantially rectangular parallelepiped which can be installed in a state where it is rotated 90 degrees clockwise and counterclockwise with respect to the upright placement of the housing, the central storage section is equipped with a fixed main shaft supported in a one-handed manner from the rear wall section to the front inside, the fixed main shaft rotatably supports a cylindrical rotor frame at its tip end via a bearing, and the outer periphery of the fixed main shaft is supported by a bearing. The stator and stator winding of the permanent magnet synchronous motor are arranged in a region, a circular opening penetrating the front wall is formed in the front wall, and the cylindrical rotor frame is fitted and arranged to be freely rotatable in the circular opening, and the rotor frame has a plurality of permanent magnets of the permanent magnet synchronous motor fixed to its inner circumferential surface facing the stator, and the sheave is integrally formed on the front side of the rotor frame and rotates together with the sheave, and the housing has a center line of the fixed main shaft. The outer frame portion has a left-right symmetrical shape with respect to a vertical plane including the housing, and the outer frame portion has plate-like portions located at both left and right end regions of the upper and lower surfaces which are parallel to each other, and support portions extending upward or downward from the front wall portion and the rear wall portion respectively along the vertical sides of the approximately rectangular parallelepiped to support each plate-like portion at the front and rear, and each of the plate-like portions has a flat outer surface which forms the outermost peripheral surface of the hoist, and is provided with one or more screw holes for screwing the plate-like portions to a contact surface on which the housing is installed.

[0024] In the elevator hoist of the present invention having the above configuration, the housing that rotatably supports the sheave and houses the drive system including the permanent magnet motor has an outer frame part with a frame-like structure forming a roughly rectangular outline shape, and has plate-like parts at both left and right end regions of the parallel upper and lower faces of this outer frame part, and the housing is fixed to the installation surface with screws using screw holes in the plate-like parts, so that by setting each plate-like part to an appropriate thickness, it is possible to provide sufficiently excellent resistance to stress concentrated on the fixing parts, especially when placed on the bottom.In addition, in this invention, the side of the housing where the sheave is located is referred to as the front (front), and the opposite surface is referred to as the back (rear).

[0025] In addition, in the present invention, the outer frame has a contour shape of a substantially rectangular parallelepiped that allows the housing to be installed in a laid-down state rotated 90 degrees clockwise and counterclockwise from the upright position, which is the basic installation state of the housing. That is, the contour surface of the outer periphery of the outer frame forms the contact surface when the housing is placed upright and when the housing is placed laid-down. Therefore, the housing can be installed in various locations in a relatively narrow machine room-less elevator hoistway, which may be selected for top placement, bottom placement, side placement, etc., in an orientation that corresponds to the area of ​​the installation area.

[0026] In addition, each plate-shaped part in the present invention has a flat outer surface, which is the contour surface of the housing and the outermost peripheral surface of the hoist, and therefore serves as a ground surface when the housing is placed upright, but the housing can be held down by abutting the steel material, steel frame, etc. of the elevator shaft structure on the surface of the upper plate-shaped part while screwing the housing to the lower plate-shaped part, and therefore can withstand a tensile load, particularly upward. This avoids the risk of the housing coming off the installation surface, and the housing is kept more stably fixed, ensuring high safety. In addition, the sides of the support parts that support each plate-shaped part at the front and rear and the sides of the plate-shaped parts form the substantial ground surface when the housing is placed sideways, but when the housing is placed sideways in this manner, the flat outer surfaces of the plate-shaped parts are located on the left and right outer sides, so that if the plate-shaped parts are screwed to the housing while sandwiched between the steel materials extending vertically, a strong and stable installation state is ensured.

[0027] Furthermore, according to the present invention, the housing is composed of a substantially cylindrical central storage section and an outer frame section that is a frame-like structure that extends from the central storage section to the outer periphery area and forms a substantially rectangular parallelepiped outline shape, and the functions are divided between the storage section for the drive system and the outer frame section as a support section. Therefore, compared to a case in which the entire housing is composed of thick wall-like members with six sides, the present invention reduces the number of components by using the frame-like structure of the outer frame section. Therefore, even if the thickness of each of the above-mentioned plate members is increased, the increase in the number of members is suppressed to a partial increase, so that the size and weight of the housing itself do not increase. Moreover, the plate members that are normally subjected to not only the elevator load but also the load when pressed down by steel materials are supported at the front and rear by support members that extend upward or downward from the front and rear walls of the central storage section along the vertical sides of the substantially rectangular parallelepiped, so that the frame-like structure has sufficient mechanical strength.

[0028] The case of the present invention can be formed by casting cast iron in the same manner as in the past, but by using a material of the component parts itself with a higher tensile strength, it is possible to easily ensure resistance to stress concentration at the fixed parts. For example, it is preferable to use ductile cast iron. Ductile cast iron is a cast iron in which the graphite in the structure is made spherical to improve strength and ductility. Compared to gray cast iron such as FC300, which is a common cast iron used as a material for conventional cases, ductile cast iron has high ductility and toughness, and therefore has excellent properties in tensile strength and elongation.

[0029] Such a casing made of ductile cast iron provides sufficient resistance without making the plate-like portion of the outer frame, where stress is concentrated as a fixing portion, extremely thick, and can be used in a hoisting machine of a relatively heavy load type, for example, with a sheave diameter of 500 mm. In this case, the thickness of the plate-like portion needs to be 28 mm or more.

[0030] In addition, the housing according to the present invention has a symmetrical shape with respect to a vertical plane including the center line of the fixed main shaft, so that the weight balance is stable. Therefore, the pair of electromagnetic brake devices constituting the electromagnetic drum brake can be configured to be installed on both left and right outer surface portions symmetrical with respect to the vertical plane of the outer frame, so that a stable weight balance of the housing can be maintained. It is simple to adopt an electromagnetic drum brake equipped with a non-excitation operation mechanism similar to that of the conventional one. In this case, it is sufficient that the pair of electromagnetic brake devices are configured so that the main body portion including the solenoid is installed on both left and right outer surface portions of the outer frame, and brake the rotor frame inside the central storage portion.

[0031] That is, the pair of electromagnetic brake devices each include a pair of solenoids that are excited by energization, a pair of brake shoes arranged on both the left and right sides of the outer peripheral surface of the rotor frame, and a pair of springs that urge each brake shoe against the outer peripheral surface of the rotor frame. When the corresponding solenoid is in an excited state, each brake shoe is moved away from the outer peripheral surface of the rotor frame against the spring urging force by the attraction force generated, and when the solenoid is cut off and in a non-excited state, the spring urging force presses the brake shoes against the outer peripheral surface of the rotor frame from both the left and right sides inside the central storage section, stopping the rotation of the rotor frame. When the rotor frame stops in this way, the sheave that rotates integrally with the rotor frame also stops, and the elevator car is prevented from ascending or descending. Therefore, the central storage section is formed with side openings on both the left and right sides of the outer peripheral section through which the rotor frame is exposed.

[0032] In a traction elevator, the brake of the hoist may be activated due to a power outage or other reason, causing the car to stop in a position that is different from the boarding and alighting position of each floor. In this case, the brake is intermittently released by utilizing the imbalance between the car and the counterweight, and the car moves in the direction of whichever is heavier, so that it reaches the boarding and alighting position. However, if the car and the counterweight are balanced with the same load, it becomes necessary to rotate the sheave by manually operating the handle with the brake released to move the car.

[0033] In the present invention, as a manual car movement mechanism, a gear is integrally formed between the rotor frame and the sheave, and a torque wrench engagement port into which a torque wrench is inserted so as to be able to engage with the gear is formed at the upper center position of the front wall of the central storage section. With this, by inserting a torque wrench into the torque wrench engagement port and engaging the engagement portion with the gear, the gear can be rotated by operating a handle for the torque wrench, thereby rotating the sheave integrally and manually moving the car. In addition, the brake torque is measured during regular inspections of elevators, and this manual car movement mechanism can also be used to measure the brake torque.

[0034] In addition, if oil splashes from the main rope as the sheave is driven, the oil may enter the housing from the sheave along the rotor frame. It is necessary to prevent such oil from adhering to the brake braking surface on the outer circumferential surface of the rotor frame, i.e., the contact surface of the brake shoe. Therefore, by providing at least one groove around the entire circumference of the rotor frame, closer to the front than the brake braking surface on the outer circumferential surface, this groove functions as an oil tank that collects oil from the sheave side and prevents it from reaching the brake braking surface. It is more preferable to provide two such grooves parallel to each other. In this case, even if oil collects and overflows in the first groove on the sheave side, it can be stopped by the second groove. The oil collected in these grooves can be collected and removed during regular inspections.

[0035] In addition, if the bearing that rotatably supports the sheave between the fixed main shaft and the bearing is damaged, the lubricating oil will leak out. Therefore, it is preferable to form an outlet in the support wall that supports the fixed main shaft on the rear wall to discharge the leaked lubricating oil from the bearing side to the outside of the housing.

[0036] In addition, the central storage section in the present invention has a partially exposed outer circumferential surface due to the frame-like structure of the outer frame that supports the central storage section. This exposed portion can be used to provide other auxiliary mechanisms for the hoist, resulting in an efficient design. For example, a plurality of cooling fins can be integrally provided on the central upper surface exposed between the plate-like portions in the left and right end regions of the upper surface of the outer frame. This allows the cooling fins to be provided without expanding the occupied space around the housing and increasing the size of the hoist.

[0037] Furthermore, if it is necessary to prevent water from entering the central storage section and improve waterproofing, a cover member that covers and closes the gap between the circular opening and the rotor frame can be attached to the front wall. EXAMPLES

[0038] A traction type elevator hoist as an embodiment of the present invention is shown in schematic configuration diagrams in Figs. 1 to 4. Fig. 1(a) is a front view, and Fig. 1(b) is a perspective view. Fig. 2 is a plan view, Fig. 3(a) is a left side view, and Fig. 3(b) is a right side view. Fig. 4 is a perspective view showing the state in which the electromagnetic brake device on the left side of the front side has been removed, Fig. 4(a) shows the entire housing, and Fig. 4(b) is a partially enlarged view of the vicinity of the wrench insertion opening in (a). The elevator hoist according to this embodiment is a gearless type hoist 1 using a permanent magnet synchronous motor (hereinafter also referred to as a PM motor), and the housing 2 that houses the drive system and supports the sheave 3 is cast from ductile cast iron with excellent tensile strength and toughness.

[0039] The housing 2 in this embodiment has a unique form not seen in the past, and is mainly composed of a substantially cylindrical central storage section 10 inside which the components of the PM motor are arranged, and an outer frame section 20 which supports the central storage section 10 with a frame-like structure which extends integrally from the central storage section 10 to the outer circumferential region and forms the contour shape of a substantially rectangular parallelepiped.

[0040] The hoist 1 of this embodiment is a so-called thin type, and the thickness of the housing 2, which is the thickness from the front wall 11 to the back wall 15 along the cylindrical center line of the substantially cylindrical central storage section 10, is smaller than the cylindrical diameter. The arrangement of the components of the PM motor stored in the central storage section 10 may be the same as that of the PM motor of a conventional thin hoist.

[0041] That is, as shown in the schematic vertical cross-sectional view of Fig. 5, a fixed main shaft 31 supported inwardly in a one-handed manner at the front inside by a support wall 15Y extending inwardly from the center of the rear wall 15 rotatably supports a cylindrical rotor frame 30 at its tip via a bearing 36, and the rotor frame 30 is rotatably fitted into a circular opening 12 formed penetrating the front wall 11. A stator 32 and a stator winding 33 of the PM motor are disposed in the outer peripheral region of the fixed main shaft 31, and a plurality of permanent magnets 34 of the PM motor are fixed to the inner peripheral surface of the rotor frame 30 so as to face the stator 31. Furthermore, a sheave 3 is integrally formed coaxially with the rotor frame 30 on its front side, so that the sheave 3 also rotates when the rotor frame 30 rotates.

[0042] The housing 2 of this embodiment has a bilaterally symmetrical shape with respect to a vertical plane Y including the center line X of the fixed main shaft, and its outer frame part 20 has a contour shape of a substantially rectangular parallelepiped, and as described later, the housing 2 can be placed on its side in a state rotated 90 degrees clockwise or counterclockwise with respect to the upright placement. That is, the contour surface of the outer peripheral side surface becomes the ground surface Cf when the housing 2 is installed in each orientation.

[0043] Specifically, the outer frame 20 has plate-like portions (21a, 21b, 21c, 21d) formed in both left and right end regions of the upper and lower surfaces that are parallel to each other. The plate-like portions (21a, 21b, 21c, 21d) are supported at the front and rear ends by support columns (22af, 22ar, 22bf, 22br, 22cf, 22cr, 22df, 22dr) that extend upward or downward from the front wall 11 and the rear wall 15 along the vertical sides of the approximately rectangular parallelepiped. The inner ends of the plate-like portions are supported by inclined walls (23a, 23b, 23c, 23d) that extend from the outer peripheral surface of the central storage section 10.

[0044] Each of the plate-shaped parts (21a, 21b, 21c, 21d) has a flat outer surface which is the outermost contour surface of the hoisting machine 1, and the outer surface of the lower plate-shaped part (21c, 21d) is the ground surface when the housing 2 is placed upright. Each of the plate-shaped parts (21a, 21b, 21c, 21d) has a predetermined thickness, and is placed on a structure in the hoistway in which the housing 2 is installed, for example, a structure 100 such as a steel frame, and is fixed to the contact surface with bolts. In this embodiment, each of the plate-shaped parts (21a, 21b, 21c, 21d) has three screw holes N arranged in the front-rear direction, into which bolts are screwed.

[0045] In this embodiment, as shown in Table 1 below, two frame types were constructed, one with a sheave 3 diameter of 410 mm and the other with a sheave diameter of 500 mm. Here, as a design example of frame type 1 with a sheave 3 diameter of 500 mm, when the width and height of the housing 2 itself are about 600 mm and the thickness in the front-rear direction is 230 mm or less, for example, about 250 mm, the thickness T of each plate-shaped part (21a, 21b, 21c, 21d) is set to about 30 mm. Also, each screw hole N corresponds to the M16 standard. Note that, even if the elevator hoist of the present invention has a different sheave diameter, the effect of the present invention can be expected in either case by appropriately setting each design such as the overall dimensions and the thickness of the plate-shaped parts.

[0046] [Table 1]

[0047] A more specific configuration of the outer frame portion 20 in this embodiment is that the plate-shaped portions (21a, 21b, 21c, 21d) and the front and rear support portions form the four corners of an approximately rectangular parallelepiped, and the outer peripheral surface of the central storage portion 10 and the inclined walls extending integrally from the outer peripheral surface form hollow columnar structures (25a, 25b, 25c, 25d). That is, the hollow columnar structure (25a, 25b) on the upper side has a polygonal columnar shape surrounded by four sides, namely the plate-shaped portion (21a, 21b), the front and rear support portions (22af / 22ar / 22bf / 22br), the inclined walls (23a, 23b), and the upper outer peripheral surface (10a / 10b) of the central storage portion 10, and the hollow columnar structure (25c / 25d) on the lower side has a polygonal columnar shape surrounded by five sides, namely the plate-shaped portion (21c / 21d), the front and rear support portions (22cf / 22cr / 22df / 22dr), the inclined walls (23c / 23d), the lower outer peripheral surface (10c / 10d) of the central storage portion 10, and a parallel surface facing the plate-shaped portion (21c / 21d).

[0048] As described above, in the case 2 of this embodiment, the central storage section 10 is supported by the outer frame section 20 having a frame-like structure, so that the number of components is reduced compared to when the entire case is made up of thick, six-sided wall-like members. Therefore, even if the thickness of each of the plate members (21a, 21b, 21c, 21d), which are the fixed sections on which stress is concentrated, is increased, the increase in the number of components is kept to a localized level, so that the case itself does not become larger or heavier.

[0049] Furthermore, since the outer frame 20 of the housing 2 in this embodiment has flat plate-like portions (21a, 21b) on both the left and right ends, not only on the bottom surface that serves as the ground contact surface but also on the top surface, when installing the housing 2, the structure 100 can be abutted against and pressed against the plate-like portions (21a, 21b) to fix the housing 2 to a structure in the elevator shaft. Therefore, the pressing force of the structure 100 ensures that the housing 2 is installed in a stable state, particularly against an upward load. Furthermore, even if each plate-like portion (21a, 21b, 21c, 21d) of the outer frame portion 20 is subjected to the load of the structure 100 itself pressing down from above in addition to the normal elevator load, each plate-like portion is supported at the front and rear by support portions (22af·22ar, 22bf·22br, 22cf·22cr, 22df·22dr) extending upward or downward from the front wall portion 11 and rear wall portion 15 of the central storage section 10 along the vertical sides of the approximately rectangular parallelepiped, so that the outer frame portion 20 exhibits sufficient mechanical strength despite its frame-like structure.

[0050] In this embodiment, the housing 2 has a symmetrical shape with respect to the vertical plane Y including the center line X of the fixed main shaft, so that the weight balance is stable. The pair of electromagnetic brake devices (4a, 4b) constituting the electromagnetic drum brake are also installed on both left and right outer surface portions of the outer frame portion 20 that are symmetric with respect to the vertical plane Y, so that a stable weight balance of the housing 2 is maintained. The pair of electromagnetic brake devices (4a, 4b) are equipped with a non-excitation operation mechanism similar to that of the conventional device, and the main body portion including the solenoid is installed on both left and right outer surface portions of the outer frame portion, and is configured to apply the brakes to the rotor frame 30 inside the central storage portion 10.

[0051] In the pair of electromagnetic brake devices (4a, 4b), when the pair of solenoids are energized and excited, the pair of brake shoes (5a, 5b) arranged on both the left and right sides of the outer peripheral surface of the rotor frame 30 are positioned away from the outer peripheral surface of the rotor frame 30, and the brake is released. When the solenoids are de-energized by cutting off the current to the solenoids, the brake shoes (5a, 5b) with their back plates pressed by the spring force are pressed against the outer peripheral surface of the rotor frame 30 from both the left and right sides inside the central storage section 10, respectively, so that the brake is in a braking state that stops the rotation of the rotor frame 30, and the rotation of the sheave 3 is also stopped. Therefore, in this embodiment, as shown in FIG. 4, the central storage section 10 has side openings 14 formed on both the left and right parts of the outer peripheral side surface, the rotor frame 30 is exposed, and each brake shoe (5a, 5b) can be inserted. The brake motor terminal box 40 is attached above the rear wall portion 15 in a position where it does not protrude above the outer surfaces of the plate-like portions (21a, 21b) at both upper left and right ends.

[0052] In addition, although omitted in the overall view of FIG. 1 and the like, in this embodiment, as shown in FIG. 4(b), a gear 38 is integrally formed between the rotor frame 30 and the sheave 3, and a torque wrench engagement port 16 is formed at the upper center position of the front wall portion 11. A torque wrench inserted into this torque wrench engagement port 16 engages with the gear 38 at the engagement portion. Therefore, even if the car deviates from the landing position in a balanced state with the counterweight due to braking by the brake device (4a, 4b) during a power outage or the like, by inserting a torque wrench into the torque wrench engagement port 16 and engaging it with the gear 38, the gear 38 can be rotated by operating the handle of the torque wrench, and the sheave 3 can be rotated together with the gear 38, so that the car can be manually moved to a predetermined landing position. In addition, the brake torque can be measured by using this manual moving mechanism of the car during regular inspection of the elevator.

[0053] In this embodiment, the housing 2 can be rotated 90 degrees clockwise and laid down as shown in Fig. 6(b) with respect to the upright position shown in Fig. 6(a), and can also be rotated 90 degrees counterclockwise and laid down as shown in Fig. 6(c). The total width dimension of the housing 2 in the upright position is the width of the housing 2 plus the widths of the brake devices (4a, 4b) provided protruding on both the left and right sides.

[0054] On the other hand, when placed sideways, the total width is the width of the housing 2 itself, and it occupies a smaller width than when placed upright, so it can be used when the installation space for the hoist is relatively narrow. For example, in the design example of the frame type 1 in which the diameter of the sheave 3 is 500 mm described above, the total width when placed upright is 900 mm or more, which is the width of the housing 2 of about 600 mm plus the width of each of the brake devices (4a, 4b), whereas the width when placed sideways is smaller, at about 600 mm, which is the height when placed upright. Therefore, for example, in a machine room-less elevator, it becomes easy to install the horizontal installation in a narrow area between the car and the inner wall of the hoistway.

[0055] In such a case of laying on its side, the side of each plate-like portion (21a, 21b, 21c, 21d) and the side of the support portion form a substantial ground surface Cf. In addition, in laying on its side, the pair of brake devices (4a, 4b) are positioned protruding in the vertical direction, so the grounded side structure 100 is set so that the lower ground surface Cf is positioned upward by the thickness of the outer side of the brake devices (4a, 4b). Then, by fixing the plate-like portions (21a, 21b, 21c, 21d) located on the left and right with the vertical structure 100 sandwiching the housing 2 from the left and right, a strong and stable installation state can be obtained even in laying on its side.

[0056] In this embodiment, two grooves 35 are formed parallel to each other on the outer peripheral surface of the rotor frame 30 at a position closer to the front than the braking surface against which the brake shoes (5a, 5b) abut. These grooves 35 function as oil tanks that collect oil that enters the inside of the central storage section 10 from the sheave 3 side due to oil splashes from the main rope, and can prevent the oil from entering deeper and adhering to the brake braking surface. In the design example of frame type 1 in which the diameter of the sheave 3 is 500 mm, the grooves 35 are each 2 mm wide x 2 mm deep and are formed with a center-to-center distance of 4 mm. These grooves 35 ensure that oil from the sheave 3 side is retained in the second groove 35 even if it accumulates in the first groove 35 and overflows.

[0057] Furthermore, in this embodiment, a drain port 37 is formed in the support wall portion 15Y that extends inward from the center of the rear wall portion 15 and supports the fixed main shaft 31, for discharging the lubricating oil leaked from the bearing 36 to the outside of the housing 2. This drain port 37 prevents the lubricating oil from reaching the braking surface even if the bearing 36 is damaged and leaks.

[0058] In addition, in the housing 2 of this embodiment, the central upper surface 10f of the outer peripheral surface of the rotor frame 30 is exposed in the space between the plate-like portions (21a, 21b) at both upper left and right ends due to the frame-like structure of the outer frame portion 20. Therefore, by utilizing this space, a plurality of cooling fins 13 are integrally provided on the central upper surface 10f to protrude therefrom.

[0059] As described above, the hoist 1 of this embodiment can be placed upright or rotated 90 degrees clockwise and counterclockwise on its side due to the roughly rectangular outline shape of the casing, regardless of the diameter of the sheave, and can therefore be installed in a variety of locations, such as on top, bottom, or sideways, within a relatively narrow elevator shaft. [Industrial Applicability]

[0060] The elevator hoist of the present invention is a thin, gearless type using a PM motor that is installed in a machine room-less hoistway, but can be inverter controlled in the same way as a hoist using a gear reducer, and can also be applied to elevator systems equipped with a logical decision-making device for UCMP. [Explanation of symbols]

[0061] 1:Hoisting machine 2: Housing 3: Sheave 4a.4b: Electromagnetic brake device 5a, 5b: Brake shoes 10: Central storage area 10a, 10b: Upper outer peripheral surface 10c, 10d: Lower outer peripheral surface 10f: Center top surface 11: Front wall 12:Circular aperture 13: Cooling fin 14: Side opening 15: Back wall 15Y: Support wall part 16: Torque wrench engagement port X: Center line Y: Vertical plane 20: Outer frame 21a, 21b, 21c, 21d: Plate-shaped parts Cf: ground plane N: Screw hole 22af, 22ar, 22bf, 22br, 22cf, 22cr, 22df, 22dr: Support part 23a, 23b, 23c, 23d: Slanted wall 25a, 25b: Hollow columnar structure (upper side) 25c, 25d: Hollow columnar structure (lower side) 30: Rotor frame 31: Fixed spindle 32: Stator 33: Stator winding 34: Permanent magnet 35: Groove 36: Bearings 37: Outlet 38: Gears 40: Brake motor terminal box 100: Structure

Claims

1. A traction type elevator hoisting machine includes a sheave around which a main rope is wound, the main rope suspending a car and a counterweight at both ends, a permanent magnet synchronous motor housed in a housing for driving and rotating the sheave, and an electromagnetic drum brake for stopping the rotation of the sheave, the housing includes a substantially cylindrical central storage section having a front wall section and a rear wall section that face each other and between which components of the permanent magnet synchronous motor are disposed, and an outer frame section that is a frame-like structure that extends integrally from the central storage section to an outer circumferential region and supports the central storage section, the outer frame portion has a contour shape of a substantially rectangular parallelepiped that allows the housing to be placed sideways and rotated 90 degrees clockwise and counterclockwise with respect to an upright position of the housing, the central storage section includes a fixed main shaft supported in a one-handed manner from the rear wall section toward the interior front, the fixed main shaft rotatably supporting a cylindrical rotor frame at its tip via a bearing, and a stator and a stator winding of the permanent magnet synchronous motor are disposed on the outer circumferential region of the fixed main shaft, a circular opening penetrating the front wall section is formed in the front wall section, and the cylindrical rotor frame is rotatably fitted into the circular opening, The rotor frame has a plurality of permanent magnets of the permanent magnet synchronous motor fixed to its inner circumferential surface so as to face the stator, and the sheave is integrally formed coaxially on the front side of the rotor frame so as to rotate together with the sheave, the housing has a bilaterally symmetrical shape with respect to a vertical plane including a center line of the fixed main shaft, The outer frame portion has plate-like portions located at both left and right end regions of an upper surface and a lower surface that are parallel to each other, and support portions extending upward or downward from the front wall portion and the rear wall portion along vertical sides of the approximately rectangular parallelepiped to support each plate-like portion at the front and rear, An elevator hoist, characterized in that each of the plate-shaped portions has a flat outer surface which forms the outermost peripheral surface of the hoist, and has one or more screw holes drilled therein for screwing the plate-shaped portions into the contact surface on which the housing is installed.

2. 2. The elevator hoist according to claim 1, wherein the housing is made of ductile cast iron.

3. 3. An elevator hoist as claimed in claim 1, wherein the electromagnetic drum brake is provided with a pair of electromagnetic brake devices that are installed on both left and right outer surface portions symmetrical with respect to the vertical plane of the outer frame portion and that apply braking to the rotor frame inside the central storage portion.

4. A gear is integrally formed between the rotor frame and the sheave, 3. The elevator hoist according to claim 1, wherein the central storage section has a torque wrench engagement port formed at a central position of an upper portion of the front wall portion, into which a torque wrench is inserted so as to be able to engage with the gear.

5. 3. An elevator hoist as claimed in claim 1 or 2, characterized in that the rotor frame has at least one groove running around its entire circumference, located closer to the front than the braking surface of the electromagnetic drum brake on its outer peripheral surface, as an oil tank for collecting oil from the sheave side and preventing it from entering the braking surface.

6. 3. The elevator hoist according to claim 1, wherein the central storage section has a support wall portion supporting the fixed main shaft of the rear wall portion, the support wall portion having an outlet formed therein for discharging lubricating oil leaking from the bearing to the outside of the housing.

7. The elevator hoist according to claim 1 or 2, characterized in that the central storage section has a central upper surface exposed between the plate-shaped portions in both left and right end regions of the upper surface of the outer frame section, and a plurality of cooling fins are integrally formed on the central upper surface.

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