Suspension sheave for elevator having stacked bearing type

Abstract

The present invention relates to a suspension device which is installed to vertically move an elevator car and a weight on multiple-row ropes (or belts) of a 2:1 to 8:1 rope fastening system of an elevator, and the suspension device separates a plurality of integrated fixed pulleys which are installed for secondary traction, as well as an elevator car, so that each pulley can operate separately from adjacent pulleys, and moreover, relates to a technique for allowing a bearing enabling the rotation in a towed pulley to have a lifespan suitable for high speed or heavy weight, according to the requirements for a high-speed or heavy-duty elevator. To this end, the suspension device comprises an attachment shaft, a plurality of external pulleys which are provided outside the attachment shaft to be independently rotatable and of which the number corresponds to the number of connection means, and a pair of bearing units which are provided under each of the external pulleys so that the revolution of each external pulley which rotates at high speed can be divided, wherein the bearing unit comprises a pair of first bearing members which are provided at both sides of a bearing connection socket in a double-row stack type.

Description

Suspended sheave for elevators with laminated bearing type

[0001] The present technology relates to a hanging device installed for the lifting and lowering of an elevator car and a weight on a double-row rope (or belt) with a 2:1 to 8:1 rope fastening method of an elevator. The hanging device is not only for the elevator car but also for individualizing a plurality of integral fixed pulleys installed for secondary traction so that each pulley operates independently from an adjacent pulley. In addition, the technology relates to a technology that requires the lifespan of a bearing that is rotatable inside a pulley to be pulled to be suitable for high speeds or high loads according to the requirements that the elevator is pursuing for high speeds or high loads.

[0002] In general, an elevator is a type of transportation device that vertically raises and lowers a car installed in a hoistway inside a structure by driving a hoisting machine, allowing passengers to move quickly and smoothly between floors.

[0003] In order to raise and lower the car of the above-mentioned elevator, multiple ropes (or belts) are connected in various ways based on the driving means, which is the traction machine, and a 2:1 to 8:1 rope connection method can be applied.

[0004] Here, the 2:1 rope fastening method in an elevator has a technical configuration in which, as illustrated in FIG. 1, a driving sheave (11) rotated by a traction machine, a plurality of ropes (R) wound around the driving sheave (11) for raising and lowering, one end of the ropes is connected to a known tension adjusting means (12) based on the driving sheave (11) and wound around a car sheave (13) located above a car (20), and the other end of the rope is connected to a known tension adjusting means (12A) and wound around a weight sheave (14) located above a weight (30). Typically, the car sheave (13) and the weight sheave (14) are defined as "hanging sheaves" in the elevator glossary.

[0005] The above-mentioned car is raised or lowered by the driving of the drive sheave, and as the car is lowered or raised, the car sheave, which is a hanging sheave, and the weight sheave are also raised and lowered.

[0006] Here, the rope section (hereinafter referred to as “section A”) connected between the tension adjustment means and the case sheave, and the rope section (hereinafter referred to as “section B”) connected between the weight sheave and the tension adjustment means can secure sections in which the tension of the rope can be adjusted by each tension adjustment means.

[0007] However, the rope section between the car sheave and the driving sheave (hereinafter referred to as the “C section”) and the rope section between the driving sheave and the weight sheave (hereinafter referred to as the “D section”) are sections where the tension cannot be adjusted.

[0008] In other words, since the drive sheave, the car sheave, and the weight sheave are formed as one piece with each sheave groove in which multiple ropes are wound, the tension of the ropes located in the C section as well as the D section cannot be adjusted.

[0009] This means that if any one of the ropes is shortened or lengthened, or if uneven wear occurs in one or more of the sheave grooves of the driving sheave, the car sheave, which is the hanging sheave around which each rope is wound, as well as the weight sheave, must rotate independently and unevenly so that the two lines of the sheave, i.e., the A line and the C line, and the B line and the D line, around which the rope is wound half-rotatably to tow the car or weight, can be synchronized, but because they are formed as one, the two lines of the traction sheave cannot be synchronized.

[0010] This causes frequent problems such as rope breakage or severe vibration in the 2:1 to 8:1 rope fastening method.

[0011] In order to solve the above problem, as shown in FIG. 2, the applicant of the present invention discloses a 'hanging sheave applied to a 2:1 rope fastening method for an elevator', which is a domestically registered patent No. 10-2092078, and its configuration is as follows: a mounting shaft in which each rope is wound around the hanging sheave so that the movement of each rope is free according to the amount of tension change of each rope; and a plurality of split sheaves in which each sheave groove, in which each rope is wound, is formed on the mounting shaft and is rotatable so that the movement of each rope is free according to the amount of tension change of each rope wound therearound; and the hanging sheave applied to a 2:1 rope fastening method for an elevator is provided.

[0012] Accordingly, it is possible to prevent the rope from breaking in the 2:1 rope connection method for elevators, and it is possible to ensure that the car can be raised and lowered stably, and it is also possible to secure a long service life.

[0013] However, in the case of the above-mentioned conventional technology, bearings are provided for each split sheave that rotates independently in multiple configurations on the outer surface of one mounting shaft to enable rotation, but a problem occurs in that the durability of the bearings is reduced in response to the change in tension of the rope and the high-speed rotation and high load of the split sheave.

[0014] In order to solve the above-described conventional problems, the present invention aims to improve the durability of bearings by changing the installation structure of bearings provided in a split sheave with high-speed, high-load applications applied differently according to the amount of tensile change of ropes, belts, etc.

[0015] In order to solve the above-described conventional problems, the present invention provides an elevator hanging sheave having a laminated bearing type, which comprises a mounting shaft (100), a connecting means (R) wound around an outer circumferential surface, a number of external pulleys (200) provided corresponding to the number of connecting means (R) so as to be independently rotatable on the outside of the mounting shaft (100), and a pair of bearing parts (300) provided on the lower portion of each external pulley (200) so that the rotational speed of each external pulley (200) that rotates at high speed can be shared and rotated, wherein the bearing parts (300) are characterized by including a pair of first bearing members (310) that are provided in a double-row laminated manner so as to be rotatable on both sides of a bearing connecting socket (311).

[0016] In addition, the bearing connection socket (311) is preferably provided with individual installation grooves (313) on both sides for the first bearing member (310) to be provided, and the installation groove (313) formed on one side of the bearing connection socket (311) is preferably provided with a first bearing (315) whose inner surface faces the mounting shaft (100) and whose outer surface faces the bearing connection socket (311), and the installation groove (313) formed on the other side of the bearing connection socket (311) is preferably provided with a second bearing (317) whose inner surface faces the bearing connection socket (311) and whose outer surface faces the external pulley (200).

[0017] In addition, it is preferable that the lower part of the bearing connecting socket (311) be installed apart from the outer surface of the mounting shaft (100), while the upper part be installed apart from the inner surface of the external pulley (200).

[0018] In addition, it is preferable that the inner surface of the outer pulley (200) further includes a protruding projection (PC) for maintaining the gap between the bearing portions (300) provided in pairs at the bottom.

[0019] Meanwhile, in order to solve the above-mentioned problem, the present invention is characterized in that it includes a mounting shaft (100), a cylindrical drum (400) at least one of which is inserted and installed spaced apart from the outer surface of the mounting shaft (100), a plurality of external pulleys (200) which are formed in a cylindrical shape but are inserted and installed spaced apart from the outer surface of the drum (400) and have a connecting means (R) wound around the outer surface, and a bearing part (300) which is rotatably installed between the mounting shaft (100) and the drum (400), and between the drum (400) and the external pulley (200), wherein the bearing part (300) includes a first bearing member (310) which is provided as a pair on the lower part of the drum (400) so as to have a double-row stacking method that is rotatably formed on both sides of a bearing connection socket (311), and a second bearing member (320) which is provided as a pair on the lower part of each external pulley (200).

[0020] In addition, the bearing connection socket (311) is preferably provided with an installation groove (313) formed on each side to accommodate the first bearing member (310), and a first bearing (315) is provided in the installation groove (313) formed on one side of the bearing connection socket (311) so that the inner surface thereof faces the mounting shaft (100) but the outer surface thereof faces the bearing connection socket (311), and a second bearing (317) is provided in the installation groove (313) formed on the other side of the bearing connection socket (311) so that the inner surface thereof faces the bearing connection socket (311) but the outer surface thereof faces the drum (400).

[0021] In addition, it is preferable that the lower part of the bearing connecting socket (311) be installed spaced apart from the outer surface of the mounting shaft (100), while the upper part be installed spaced apart from the inner surface of the drum (400).

[0022] In addition, it is preferable that the inner surface of the drum (400) further includes a protruding projection (PC) for maintaining the spacing of the first bearing members (310) provided in pairs at the bottom.

[0023] In addition, insertion grooves (410) are formed on both sides of the inner surface of the drum (400) for inserting and installing the first bearing member (310). Preferably, the insertion grooves (410) are formed with a step according to the height of the second bearing (317) inserted into the other side of each bearing connection socket (311) corresponding to the number of bearing connection sockets (311).

[0024] In addition, it is preferable that the first bearing member (310) and the second bearing member (320) use ball bearings or needle bearings.

[0025] According to the first embodiment (1A) and the second embodiment (1B) of the present invention, unlike the conventional one, the first and second bearings, which are installed in a double-row laminated structure at the bottom in response to an external pulley or drum that rotates independently in response to a change in tension of a connecting means, share the rotational speed and rotate, so that an effect of improved durability is expected due to a reduction in the load of the bearing for high-speed, high-load applications.

[0026] Figure 1 is a drawing showing a conventional hanging sheave connection structure with a kawa weight installed.

[0027] Fig. 2 is a perspective view showing a conventional hanging sheave.

[0028] Fig. 3 is a cross-sectional perspective view of a hanging sheave for an elevator having a laminated bearing type according to a first embodiment of the present invention.

[0029] Figure 4 is an exploded cross-sectional view of Figure 3.

[0030] FIG. 5 is a diagram showing the working relationship of a first bearing member for an elevator hanging sheave having a laminated bearing type according to the first or second embodiment of the present invention.

[0031] Fig. 6 is a cross-sectional perspective view of a hanging sheave for an elevator having a laminated bearing type according to a second embodiment of the present invention.

[0032] Fig. 7 is a cross-sectional view of Fig. 6.

[0033] Fig. 8 is another embodiment of the first bearing member of Fig. 6.

[0034] Fig. 9 is another embodiment of the first bearing member for Fig. 6.

[0035] Figures 10 and 11 are other embodiments of the drum for Figure 6.

[0036] Hereinafter, with reference to the attached drawings, a hanging sheave for an elevator having a laminated bearing type according to the present invention (hereinafter simply referred to as a “hanging sheave”) will be described in detail for each embodiment.

[0037] Before the explanation, the external pulley (200) described below means a conventional pulley having a connecting means (R) such as a rope or belt wound around the outer surface and capable of rotating in the direction of travel of the connecting means (R). A detailed explanation thereof will be omitted so as not to obscure the gist of the present invention.

[0038] First, as shown in FIGS. 3 and 4, the first embodiment (1A) of the hanging sheave according to the present invention largely includes a mounting shaft (100), an external pulley (200), and a bearing part (300).

[0039] To explain in more detail, the above-mentioned mounting shaft (100) is configured to enable the lifting and lowering of a car or weight through the tensile force of a connecting means (R) including a rope or belt, etc., by having a plurality of external pulleys (200) independently rotatably mounted on the outer surface (see Fig. 1).

[0040] To this end, the mounting shaft (100) is formed into a cylindrical shape having a predetermined overall length, and fastening holes (110) are formed at both ends for installation on a conventional bracket or frame existing on the upper part of a car or weight.

[0041] Meanwhile, in the first embodiment (1A) according to the present invention, a snap ring groove (130) is formed on the outer surface of the mounting shaft (100), and a snap ring (120) is detachably coupled to the snap ring groove (130) so that the movement of the first bearing member (310) can be prevented when the external pulley (200) rotates at high speed.

[0042] To this end, as illustrated, a snap ring (120) is installed on one side and the other side of each of a pair of first bearing members (310) that are rotatably installed between the inner surface of the outer pulley (200) and the outer surface of the mounting shaft (100) to prevent movement of the pair of first bearing members (310).

[0043] At this time, in order to maximize the flow prevention effect of the pair of first bearing members (310) described above, a protruding projection (PC) may be formed in the longitudinal direction on the inner surface of the outer pulley (200), and as illustrated, it is preferable that the pair of first bearing members (310) are installed to interface with both sides of the protruding projection (PC) so that the flow effect of the first bearing member (310) can be improved together with the snap ring (120).

[0044] In addition, in the present invention, the snap ring (120) and the snap ring groove (130) may be additionally formed on either the outer surface or the inner surface of the drum (400) to be described later, so as to also prevent movement of the second bearing member (320).

[0045] In addition, the bearing part (300) includes a bearing connection socket (311), a first bearing (315), and a second bearing (317) configured to expect improved durability through a reduction in the load received by the bearing by inducing the external pulley (200) to rotate at high speed by sharing the rotational speed of the external pulley (200) in response to the change in tension of the connecting means (R).

[0046] Before the explanation, it should be noted that in the first embodiment (1A) of the present invention, the bearing connection socket (311), the first bearing (315), and the second bearing (317) are referred to as the first bearing member (310) to differentiate them from the second embodiment (1B) of the present invention described later.

[0047] For example, as shown in the drawing, the bearing connecting socket (311) is formed in the shape of a ring with a hollow portion formed inside, and as can be seen in the cross-section (AA cross-section), a pair of installation grooves (313) are formed on both sides for inserting a first bearing (315) and a second bearing (317), so that a pair of bearings can be installed by the bearing connecting socket (311) in a double-row stacking manner.

[0048] The bearing connecting sockets (311) are arranged in pairs below one external pulley (200) so that a total of four bearings (e.g., two first bearings and two second bearings) can be installed.

[0049] Through this, it is possible to interface the inner surface of a pair of first bearings (315) with the outer surface of the mounting shaft (100) and the outer surface of a pair of second bearings (317) with the inner surface of the external pulley (200). When the external pulley (200) rotates at high speed due to the change in tension of the connecting means (R), the kinetic energy is transmitted to the pair of second bearings (317) to cause rotation.

[0050] Then, the kinetic force of the second bearing (317) is transmitted to the bearing connecting socket (311) to realize rotation of the bearing connecting socket (311), and this rotational force in turn provides power to rotate the first bearing (315).

[0051] Through this, it is expected that the durability will be improved due to a decrease in the load on the bearing as the rotation speed of the external pulley (200) is shared between the first bearing (315) and the second bearing (317).

[0052] In addition, through the above-described double-layered structure, it is expected that even if one of the first or second bearings (317) loses its normal bearing function due to long-term use, the other bearing will compensate for this and be able to rotate.

[0053] Here, the most ideal rotational speed distribution of the first and second bearings (315, 317) is, as shown in Fig. 5, that the second bearing (317) rotates 1 / 2 of a turn (from P1 to P2) based on one turn of the external pulley (200) that rotates at high speed from P1 through P2 and back to P1, while the first bearing (315) rotates so that it can share the rotational speed with the remaining 1 / 2 turn (from P2 to P1). This can be said to be the ideal rotational speed distribution.

[0054] Furthermore, the first and second bearings (315, 317) described above can respond to high-speed rotation of the external pulley (200) by using ball bearings, and, if necessary, it is also possible to use roller-type needle bearings so that the durability of the bearing can be maintained even under high loads.

[0055] Hereinafter, a hanging sheave embodiment according to the second embodiment (1B) of the present invention will be described in detail. The second embodiment (1B) largely includes a mounting shaft (100), an external pulley (200), a bearing part (300), and a drum (400), as shown in FIGS. 6 and 7.

[0056] Before the explanation, it should be noted that the second embodiment (1B) according to the present invention to be explained below further includes the configuration of the second bearing member (320) and the drum (400) in comparison with the first embodiment (1A) described above, and in particular, the mounting shaft (100) and the first bearing member (310) in the second embodiment (1B) have the same shape as those in the first embodiment (1A), and therefore, the detailed description thereof borrows the description of the first embodiment (1A) described above.

[0057] Continuing, the bearing part (300) according to the second embodiment (1B) of the present invention further includes a second bearing member (320) in addition to the first bearing member (310) including a bearing connection socket (311), a first bearing (315), and a second bearing (317).

[0058] For example, the second bearing member (320) can use a needle bearing or a metal bearing, and as shown, it is installed so that the upper and lower parts can be in contact between the inner surface of the outer pulley (200) and the outer surface of the drum (400), thereby enabling independent high-speed rotation of the outer pulley (200).

[0059] At this time, in the inner circumference of the drum (400) of the present invention having a cylindrical shape, an insertion groove (410) for inserting a first bearing member (310) is formed to prevent the outer diameter of the drum (400) from becoming unnecessarily large, thereby providing a hanging sheave having a slim structure. It is preferable that a protruding projection (PC) be formed on the inner circumference of the drum (400) due to the formation of a pair of insertion grooves (410).

[0060] Here, when the second bearing member (320) is used as a needle bearing, it can be installed as a pair on the lower part of each external pulley (200) so as to surround the outer surface of the drum (400), and when used as a metal bearing, it can be provided so as to surround the outer surface of the drum (400) so as to be in contact with the inner surface of each external pulley (200).

[0061] Meanwhile, as illustrated in FIG. 8, the first bearing member (310) according to the second embodiment (1B) of the present invention, unlike the first embodiment (1A) described above, may be provided with a plurality of bearing connection sockets (311) in a stacked structure so that they can be placed at the bottom of the drum (400).

[0062] That is, after inserting and installing the first bearing (315) into the installation groove (313) on one side of the first bearing connection socket (311), the second bearing (317) is inserted and installed into the installation groove (313) on the other side of the first bearing connection socket (311), and then inserted into the installation groove (313) on one side of the second bearing connection socket (311) so as to be in contact with the outer surface of the second bearing (317), and a separate second bearing (317) is inserted into the installation groove (313) on the other side of the second bearing connection socket (311) so as to be in contact with the inner surface of the drum (400), and installed on both sides of the drum (400).

[0063] Furthermore, as shown in FIG. 9, the first bearing member (310) according to the second embodiment (1B) of the present invention may be rotatably installed in a vertically stacked manner on each installation groove (313) formed on both sides of one bearing connection socket (311) in another embodiment.

[0064] Here, as shown in Fig. 9, the first and second bearings (315, 317) that are vertically stacked are shown as using needle bearings to provide a hanging sheave that is easy to handle with a high load, but this is only one embodiment, and it is also possible to use ball bearings to facilitate high-speed rotation of the hanging sheave, if necessary.

[0065] At this time, the installation grooves (313) formed on both sides of the inner surface of the drum (400) can be formed in a stepped shape so that a plurality of first and second bearings (315, 317) can be easily installed in the insertion grooves (410), and it is preferable that a separate auxiliary bearing (319) is additionally provided and used under the first bearing (315) as needed.

[0066] Meanwhile, in the second embodiment (1B) of the present invention, the drum (400) may be installed in pairs that can be independently rotated on the outer surface of the mounting shaft (100) as shown in FIG. 10, or may be installed in multiple (4 in the drawing) that can be independently rotated corresponding to the number of external pulleys (200) as shown in FIG. 11.

[0067] Here, first bearing members (310) are installed on both sides of the lower portion of each drum (400) provided with two or four on the outer surface of the mounting shaft (100) so that the drum (400) can rotate, and each drum (400) can rotate without movement at a set position by mounting a snap ring (120).

[0068] As described above, according to the first embodiment (1A) and the second embodiment (1B) of the present invention, unlike the conventional one, the first and second bearings (315, 317) installed in a double-row laminated structure at the bottom in response to the external pulley (200) or drum (400) that independently rotates in response to the amount of tension change of the connecting means (R) share the rotational speed and rotate, so that the durability is expected to be improved due to the reduced load on the bearing for high-speed, high-load applications.

Claims

1. Mounting shaft (100); A connecting means (R) is wound around the outer surface, and an external pulley (200) is provided in a number corresponding to the number of connecting means (R) so that independent rotation is possible outside the mounting shaft (100); and A bearing part (300) is provided in pairs at the bottom of each external pulley (200) so that the rotational speed of each external pulley (200) that rotates at high speed can be divided and rotated; including; An elevator hanging sheave having a laminated bearing type, characterized in that the bearing part (300) includes a pair of first bearing members (310) that are rotatably provided in a double-row laminated manner on both sides of a bearing connection socket (311).

2. In paragraph 1, The above bearing connecting socket (311) Individual installation grooves (313) are formed on each side to accommodate the first bearing member (310). An elevator hanging sheave having a laminated bearing type, characterized in that a first bearing (315) is provided in an installation groove (313) formed on one side of the bearing connection socket (311) so that the inner surface thereof faces the mounting shaft (100) and the outer surface thereof faces the bearing connection socket (311), and a second bearing (317) is provided in an installation groove (313) formed on the other side of the bearing connection socket (311) so that the inner surface thereof faces the bearing connection socket (311) and the outer surface thereof faces the external pulley (200).

3. In paragraph 1, An elevator hanging sheave having a laminated bearing type, characterized in that the lower part of the bearing connecting socket (311) is installed spaced apart from the outer surface of the mounting shaft (100), and the upper part is installed spaced apart from the inner surface of the external pulley (200).

4. In paragraph 1, An elevator hanging sheave having a laminated bearing type, characterized in that the inner surface of the outer pulley (200) further includes a protruding projection (PC) for maintaining the gap between the bearing portions (300) provided in pairs at the lower portion.

5. Mounting shaft (100); A cylindrical drum (400) having at least one insert installed spaced apart from the outer surface of the mounting shaft (100); A plurality of external pulleys (200) having a cylindrical shape and installed in a number of places spaced apart from the outer surface of the drum (400), and having a connecting means (R) wound around the outer surface; and A bearing part (300) is rotatably installed between the mounting shaft (100) and the drum (400), and between the drum (400) and the external pulley (200); An elevator hanging sheave having a laminated bearing type, characterized in that the bearing part (300) includes a first bearing member (310) provided in a pair on the lower portion of the drum (400) so as to have a rotatably double-layered arrangement on both sides of the bearing connection socket (311), and a second bearing member (320) provided in a pair on the lower portion of each external pulley (200).

6. In paragraph 5, The above bearing connecting socket (311) An installation groove (313) is individually formed on each side to accommodate the first bearing member (310). An elevator hanging sheave having a laminated bearing type, characterized in that a first bearing (315) is provided in an installation groove (313) formed on one side of the bearing connection socket (311) so that the inner surface thereof faces the mounting shaft (100) and the outer surface thereof faces the bearing connection socket (311), and a second bearing (317) is provided in an installation groove (313) formed on the other side of the bearing connection socket (311) so that the inner surface thereof faces the bearing connection socket (311) and the outer surface thereof faces the drum (400).

7. In paragraph 5, The lower part of the above bearing connecting socket (311) A hanging sheave for an elevator having a laminated bearing type characterized in that the upper part is installed spaced apart from the outer surface of the mounting shaft (100) and the inner surface of the drum (400).

8. In paragraph 5, An elevator hanging sheave having a laminated bearing type, characterized in that the inner surface of the drum (400) further includes a protruding projection (PC) for maintaining the spacing of the first bearing member (310) provided in pairs at the lower portion.

9. In paragraph 6, On both sides of the above drum (400) An insertion groove (410) for inserting and installing the first bearing member (310) is formed; An elevator hanging sheave having a laminated bearing type, characterized in that the insertion groove (410) is formed in steps according to the height of the second bearing (317) inserted into the other side of each bearing connection socket (311) corresponding to the number of bearing connection sockets (311).

10. In paragraph 5, The above first bearing member (310) and the above second bearing member (320) A hanging sheave for an elevator having a laminated bearing type characterized by the use of ball bearings or needle bearings.

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