JP5347365B2 - Elevator hoisting device - Google Patents

Description

  The present invention relates to a hoisting device used for raising and lowering a car or the like in an elevator, and more particularly to a hoisting device in which a sheave is cantilevered on a shaft.

  As an elevator hoisting device in which a sheave is cantilevered on a shaft, for example, the one shown in FIG. 6 is known. The elevator hoisting device 101 includes a stator 104 formed by attaching a stator core 103 to an inner periphery of a frame 102, a shaft 106 to which a rotor core 105 is attached, a first bearing (hereinafter referred to as a sheave side bearing) 107 and a first bearing 107. A rotor 111 formed by two bearings (hereinafter referred to as anti-sheave bearings) 108 that are rotatably supported by first and second brackets 109 and 110 provided on the frame, The sheave 112 is configured by attaching a sheave 112 to an end projecting outward from the sheave-side bearing 107.

A wire rope winding surface 114 in which a plurality of wire rope grooves 113 are arranged is formed on the outer periphery of the sheave 112. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 53-5963

In the elevator hoist apparatus 101 of the conventional sheave cantilever support structure, the sheave shaft load center (the center of the wire rope winding surface 114) extends from the end of the sheave-side bearing 107 of the wire rope winding surface 114. ) To the center of the sheave side bearing 107 from the sheave side end face of the sheave side bearing 107, and the sheave of the wire rope winding surface 114 from the sheave side end face of the sheave side bearing 107. When the distance to the end of the side bearing 107 is C, the overhang dimension D of the shaft 106 is
D = A + B + C ... Formula 1
It becomes.

Here, the center-to-center distance between the sheave side bearing 107 and the anti-sheave side bearing 108 is E, the force acting on the sheave side bearing 107 due to the sheave shaft load: W is L1, and the force acting on the anti-sheave side bearing 108 is L2
L1 = W · (D + E) / E = W · (A + B + C + E) / E Equation 2
L2 = W · D / E = W · (A + B + C) / E Equation 3
As shown in Expressions 2 and 3, in the current hoisting device structure, when the sheave 112 having a large width is required, the dimension A increases and the overhang dimension D increases. As a result, L1, L2 Requires a large bearing, shaft, and large frame. As a result, the hoisting device is heavy and the cost is high.

  Further, even when the sheave width is increased, it is possible to eliminate the use of a large bearing or a thick shaft by increasing the dimension E in proportion to the increase of the dimension D in FIG. Accordingly, the frame and the shaft become longer, the outer dimensions of the hoisting device become larger, and the installation space increases. In addition, there is a disadvantage that the weight is increased and the cost is increased.

  Further, a bending moment M acts on the shaft due to the sheave shaft load W.

M = W · D = W · (A + B + C) Equation 4
As shown in Equation 4, in a wide sheave, the dimension A increases and the bending moment M increases. Therefore, in order to solve the problem of the sheave inclination due to the deflection of the shaft due to the sheave shaft load: W, it is necessary to use a shaft having a large shaft diameter, which has the disadvantage that the weight is increased and the cost is increased.

  At present, when the sheave width and the sheave load are large, as shown in FIG. 7, a double-supported hoisting device 120 in which a sheave 124 is attached between bearings 122 and 123 that support the shaft 121 is employed. However, since this structure is a structure that supports the sheave on both sides, there is a drawback that it is not easy to retrofit the sheave and replace the sheave after assembling the hoisting device.

  An object of the present invention is to provide a hoisting device having a cantilever structure suitable for application when a sheave width and a sheave load are large.

According to the first aspect of the present invention, the stator formed by attaching the stator core to the inner periphery of the frame and the shaft to which the rotor core is attached are rotated to the first and second brackets provided on the frame by the first and second bearings. An elevator hoisting apparatus comprising: a rotor formed by freely supporting; and a sheave attached to an end of the shaft that protrudes outside the first bearing;
The sheave includes a wire rope winding surface in which a plurality of wire rope grooves are arranged on the outer peripheral side, and a cylindrical shape including a bearing insertion portion that inserts the first bearing on the inner peripheral side of the wire rope winding surface. The one end side in the length direction is supported by the shaft, and the first bearing is inserted into the bearing insertion portion,
The center in the width direction of the first bearing inserted into the bearing insertion portion is positioned outside the center of the sheave shaft load in the direction away from the second bearing .

Since the hoisting device of claim 1 supports the sheave shaft load W between the first bearing and the second bearing, the hoisting device of the double-supported structure shown in FIG. The inclination of the sheave can be eliminated and the sheave can be supported in a stable state. In addition, the user-friendliness that is an advantage of the cantilevered hoisting device can be maintained.

FIG. 1 shows an elevator hoist apparatus 1 of a first reference example. The elevator hoisting device 1 includes a stator 4 formed by attaching a stator core 3 to an inner periphery of a frame 2, and a shaft 6 to which a rotor core 5 is attached as a first bearing (hereinafter referred to as a sheave-side bearing) 7 and a first bearing. A rotor 11 formed by two bearings (hereinafter referred to as anti-sheave bearings) 8 that are rotatably supported by first and second brackets 9 and 10 provided on the frame 2. A sheave 12 is attached to the end of the sheave bearing 7 that protrudes outward.

  A wire rope winding surface 14 in which a plurality of wire rope grooves 13 are arranged is formed on the outer periphery of the sheave 12.

  The sheave 12 includes a bearing insertion portion 15 for inserting the sheave-side bearing 7 on the inner peripheral side of the wire rope winding surface 14, and the sheave-side bearing 7 is inserted into the bearing insertion portion 15. Yes.

In the first reference example, the sheave-side bearing 7 extends from a position where it has entered the bearing insertion portion 15 until an end surface of the sheave-side bearing 7 on the sheave shaft load center side reaches the sheave shaft load center. Is located. That is, the positional relationship between the sheave-side bearing 7 and the sheave 12 is expressed by a formula 2B <C <A.

  As described above, the overhang dimension D can be reduced as compared with the conventional hoisting device shown in FIG. 6 by inserting the sheave-side bearing 7 into the bearing insertion portion 15. As a result, the force L1 acting on the sheave-side bearing 7 and the force L2 acting on the non-sheave-side bearing 8 are also reduced, making it possible to reduce the size and weight of these bearings, shafts, and frames, thereby reducing costs. Become. Further, the bending moment: M due to the sheave shaft load: W is also reduced, so that the shaft bends due to the sheave shaft load: W is reduced even if the shaft is thinner than the current shaft, and the sheave inclination can be reduced.

FIG. 2 shows an elevator hoisting device 1 of a second reference example. In this reference example, the center in the width direction of the sheave-side bearing 7 inserted into the bearing insertion portion 15 is positioned at the sheave shaft load center. That is, the positional relationship between the sheave-side bearing 7 and the sheave 12 is expressed as C = A + B. Other configurations are the same as in the case of the first reference example, and a duplicate description is omitted.

  As described above, since the center in the width direction of the sheave-side bearing 7 is located at the sheave shaft load center, the overhang dimension D can be made zero. As a result, L1 becomes the same value as the sheave shaft load: W, and the radial load applied to the sheave-side bearing 7 can be made smaller than in the case of claim 1. Further, since the force L2 acting on the non-sheave bearing 8 is zero, the bearing can be made smaller than in the case of the first aspect. Further, since there is no bending moment: M due to sheave shaft load: W, and no shaft deflection occurs, the sheave tilt can be eliminated by the shaft deflection. In addition, the shaft can be made thinner and lighter.

FIG. 3 shows the elevator hoisting apparatus 1 of the first embodiment. In this embodiment, the center of the sheave-side bearing 7 in the width direction is positioned outside the sheave shaft load center (on the opposite side of the sheave shaft load center as the boundary from the sheave shaft load center 8). That is, the positional relationship between the sheave-side bearing 7 and the sheave 12 is expressed as zero <D. Other configurations are the same as those in the first and second reference examples, and thus redundant description is omitted.

  As described above, the sheave shaft load: W is supported between the sheave-side bearing 7 and the anti-sheave-side bearing 8, so that the bending of the shaft or the like is suppressed in the same manner as the both-end support hoisting device shown in FIG. The sheave can be supported in a stable state by eliminating the inclination of the sheave. In addition, the user-friendliness that is an advantage of the cantilevered hoisting device can be maintained.

In the first real施例shown in FIG. 3, there is shown the case where attached by shrink fitting the sheave 12 to one end of the shaft 6, as shown in FIGS. 4 and 5, one end of the shaft 6 May be inserted into the shaft insertion portion 16 provided on the sheave 12 and the shaft 6 and the sheave 12 may be coupled by the nut 17 or the bolt 18. By joining in this way, the sheave 12 can be easily replaced.

(A) is sectional drawing of the winding apparatus of a 1st reference example, (B) is a side view. (A) is sectional drawing of the winding apparatus of a 2nd reference example, (B) is a side view. (A) is sectional drawing of the winding apparatus of 1st Example, (B) is a side view. Explanatory drawing which shows the coupling | bonding method of a shaft and a sheave. Explanatory drawing which shows the coupling | bonding method of a shaft and a sheave. (A) is sectional drawing of the winding apparatus of the conventional cantilever structure, (B) is a side view. (A) is sectional drawing of the winding apparatus of the conventional both-ends structure, (B) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Elevator hoisting device 2 ... Frame 3 ... Stator core 4 ... Stator 5 ... Rotor core 6 ... Shaft 7 ... 1st bearing (sheave side bearing)
8. Second bearing (anti-sheave bearing)
9 ... 1st bracket 10 ... 2nd bracket 11 ... Rotor 12 ... Sheave
13 ... Wire rope groove 14 ... Wire rope winding surface 15 ... Bearing insertion part

Claims (1)

Formed by rotatably supporting a stator formed by attaching a stator core to the inner periphery of the frame and a shaft attached with the rotor core to first and second brackets provided on the frame by first and second bearings. An elevator hoisting apparatus, wherein a sheave is attached to an end of the shaft that protrudes outside the first bearing;
The sheave includes a wire rope winding surface in which a plurality of wire rope grooves are arranged on the outer peripheral side, and a cylindrical shape including a bearing insertion portion that inserts the first bearing on the inner peripheral side of the wire rope winding surface. The one end side in the length direction is supported by the shaft, and the first bearing is inserted into the bearing insertion portion,
The elevator hoisting apparatus, wherein the center in the width direction of the first bearing inserted into the bearing insertion portion is positioned outside the center of the sheave shaft load in the direction away from the second bearing .

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