Roll-on machine

Abstract

To provide a hoisting machine that offers superior workability during manufacturing and assembly compared to conventional models, and that suppresses the intrusion of lubricating oil into the braking section. [Solution] The hoisting machine comprises a drive sheave having a rope winding surface on its outer circumference for winding and unwinding the rope, a brake disc attached to one axial side of the drive sheave, and a cover member positioned between the rope winding surface and the brake disc in the axial direction of the drive sheave, shielding the brake disc from the outer circumference of the drive sheave. Multiple protrusions are formed on the outer circumference of the drive sheave at positions between the rope winding surface and the cover member in the axial direction, forming an annular shape in the circumferential direction of the drive sheave and projecting radially beyond the rope winding surface.

Description

Technical Field

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[0001] The present invention relates to a hoisting machine.

Background Art

[0002] Conventionally, a hoisting machine for an elevator is known, which rotates a driving sheave with an electric motor to move a car and stops the rotation of the driving sheave with a braking unit. In this type of hoisting machine, lubricating oil is used on the rope winding surface of the driving sheave for lubrication with the rope, while it is necessary to protect the braking surface of the braking unit from the above lubricating oil in order to maintain the performance of the braking unit. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​According to Patent Document 1 mentioned above, when applied to a hoisting machine where the cover is not structurally removed, it is difficult to install oil absorbent material such as felt on the cover. Furthermore, during maintenance of the hoisting machine, it is necessary to correctly reattach the felt to the drive sheave, which can complicate the assembly work for maintenance. Furthermore, according to the above-mentioned Patent Document 2, since it is necessary to fit a discharge member with a complex shape into the groove of the drive sheave, there was still room for improvement in terms of workability during manufacturing and assembly.

[0007] The present invention has been made in view of the above circumstances, and provides a hoisting machine that is more efficient in terms of workability during manufacturing and assembly than conventional machines, and that can suppress the intrusion of lubricating oil into the braking part. [Means for solving the problem]

[0008] A hoisting machine according to one embodiment comprises a drive sheave having a rope winding surface on its outer circumference for winding and unwinding a rope, a brake disc attached to one axial side of the drive sheave, and a cover member positioned between the rope winding surface and the brake disc in the axial direction of the drive sheave, shielding the brake disc from the outer circumference of the drive sheave. Multiple protrusions are formed on the outer circumference of the drive sheave at positions between the rope winding surface and the cover member in the axial direction, forming an annular shape in the circumferential direction of the drive sheave and projecting radially beyond the rope winding surface.

[0009] In one embodiment described above, the cover member may reach the projection from the rope winding surface and receive the oil scattered from the projection by the centrifugal force caused by the rotation of the drive sheave on the other side in the axial direction. [Effects of the Invention]

[0010] According to one embodiment, a hoisting machine can be provided that offers superior workability during manufacturing and assembly compared to conventional machines, and that can suppress the intrusion of lubricating oil into the braking section. [Brief explanation of the drawing]

[0011] [Figure 1] This is an axial cross-sectional view showing the main part of the hoisting machine of this embodiment. [Figure 2] This is a magnified section of Figure 1. [Figure 3] This is a cross-sectional view of the drive sheave in the direction perpendicular to the axial direction. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. In the embodiments, for the sake of clarity, structures and elements other than the main parts of the present invention will be simplified or omitted in the description. Also, the same elements will be denoted by the same reference numerals in the drawings. Note that the shapes and dimensions of each element shown in the drawings are schematic representations and do not represent the actual shapes and dimensions.

[0013] In the following explanation, the direction parallel to the extension of the rotation axis Ax of the hoisting machine will be referred to as the axial direction, the circumferential direction centered on the rotation axis Ax will be simply referred to as the circumferential direction, and the radial direction centered on the rotation axis Ax will be simply referred to as the radial direction.

[0014] Figure 1 is an axial cross-sectional view showing the main part of the hoisting machine 1 of this embodiment. Figure 2 is a partially enlarged view of Figure 1. Figure 3 is a cross-sectional view of the drive sheave 2 in a direction perpendicular to the axial direction.

[0015] The hoisting machine 1 of this embodiment is applicable, for example, to an elevator hoisting machine. The hoisting machine 1 comprises a cylindrical drive sheave 2, a shaft 3, a rotor and a stator (neither of which are shown), and a braking unit 4.

[0016] The drive sheave 2 is responsible for winding up or unwinding the rope 5 that connects the elevator car and the weight. The outer circumference of the drive sheave 2 is provided with a rope winding surface 2a, which has grooves circumferentially cut into it to correspond to the rope 5. The surface of the rope winding surface 2a is lubricated by lubricating oil seeping from the rope 5.

[0017] The shaft 3 penetrates the drive sheave 2 in the axial direction and is attached concentrically with respect to the drive sheave 2. The shaft 3 is rotatably supported at both sides by a pair of bearing blocks (both not shown) fixed to a base (not shown).

[0018] One end of the shaft 3 (the right side in the figure) protrudes through the bearing block on one side. A rotor having a cylindrical magnetic pole portion is attached to one end of the shaft 3. A cylindrical stator is arranged on the outer periphery of this rotor with an air gap therebetween. A coil is wound around the stator, and by sequentially switching the magnetic field of the stator by controlling the current of the coil, an attractive force or a repulsive force with respect to the magnetic pole portion of the rotor is generated in the stator. Thereby, the drive sheave 2 is rotationally driven via the shaft 3 to which the rotor is attached.

[0019] The braking unit 4 is a braking device that stops the rotation of the drive sheave 2. The braking unit 4 is arranged on one side (the right side in the figure) of the drive sheave 2, and includes a brake disk 6, a pair of brake pads 7 that sandwich the brake disk 6, and an electromagnetic clamp (not shown) that drives the brake pads 7 in the axial direction.

[0020] The brake disk 6 has an overall shape of an annular plate and is fixed to the drive sheave 2 on one side of the drive sheave 2. The brake disk 6 extends along the radial direction so as to be orthogonal to the rope winding surface 2a of the drive sheave 2, and is attached on one side of the drive sheave 2 such that the braking surface 6a forms a flange shape. Note that a groove 6b that functions as an oil return is formed on the inner peripheral side of the braking surface 6a of the brake disk 6. The outer peripheral side surface of the groove 6b is inclined toward the inner peripheral side in the height direction of the groove. Thereby, the groove 6b receives lubricating oil from the inner peripheral side and suppresses the leakage of lubricating oil from the groove 6b to the braking surface 6a.

[0021] The brake pads 7 and the electromagnetic clamp of the braking unit 4 are provided on the housing 10 of the hoist 1. In the braking unit 4, the rotation of the drive sheave 2 connected to the brake disk 6 is stopped by sandwiching the braking surface 6a of the brake disk 6 with the brake pads 7.

[0022] Also, in the axial direction of the hoist 1, between the braking part 4 and the rope winding surface 2a of the driving wire rope drum 2, an annular plate-shaped cover member 11 for shielding the brake disk 6 from the outer periphery of the driving wire rope drum 2 is arranged. The cover member 11 is fixed to the housing 10 of the hoist 1, and partitions the space of the rope winding surface 2a and the braking part 4 on the other side (left side in the figure) of the brake disk 6. Further, the cover member 11 covers the surface on the other side of the brake disk 6 with a slight gap with respect to the outer periphery of the driving wire rope drum 2 in order to avoid interference with the rotating driving wire rope drum 2.

[0023] The cover member 11 has a function of suppressing the adhesion of the lubricating oil scattered from the driving wire rope drum 2 to the braking surface 6a and the brake pad 7. An oil recovery plate 12 for returning the lubricating oil adhering to the cover member 11 to an oil pan (not shown) is arranged on the outer peripheral side of the cover member 11.

[0024] Also, on the outer peripheral surface of the driving wire rope drum 2, a plurality of protrusions 13 are formed between the rope winding surface 2a and the cover member 11 in the axial direction. As shown in FIG. 2, each protrusion 13 protrudes in the radial direction from the rope winding surface 2a and is formed in parallel with the driving wire rope drum 2 at intervals in the axial direction. Further, as shown in FIG. 3, each protrusion 13 is arranged annularly along the circumferential direction of the driving wire rope drum 2.

[0025] In the present embodiment, an example in which two protrusions 13 are formed in the axial direction on the outer peripheral surface of the driving wire rope drum 2 is shown, but three or more protrusions 13 may be formed in the axial direction. Also, the plurality of protrusions 13 may all have the same shape, or may have different shapes such as the radial height and the axial width.

[0026] The plurality of protrusions 13 formed on the outer periphery of the driving wire rope drum 2 have a function of scattering the lubricating oil flowing from the rope winding surface 2a to one side (the direction of the braking part 4) to the outer peripheral side by centrifugal force.

[0027] When the hoisting machine 1 is in operation, as shown by the dashed line in Figure 2, the lubricating oil flowing from the rope winding surface 2a toward one side, when it reaches the projection 13 on the other side (the projection on the left in the figure), is largely scattered outwards by centrifugal force as it overcomes the projection 13 on the other side. Furthermore, the remaining lubricating oil that has overcome the projection 13 on the other side and is flowing toward the one side, is also largely scattered outwards by centrifugal force as it overcomes the projection 13 on the other side (the projection on the right in the figure). The lubricating oil scattered at the projection 13 adheres to the cover member 11 or the oil recovery plate 12 and is returned to the oil pan.

[0028] As described above, the multiple protrusions 13 formed on the outer circumference of the drive sheave 2 significantly reduce the amount of lubricating oil flowing from the rope winding surface 2a to the braking section 4. Furthermore, any small amount of lubricating oil that leaks through the gap between the cover member 11 and the drive sheave 2 via the multiple protrusions 13 is prevented from entering the braking surface 6a by the oil return groove 6b of the brake disc 6. Therefore, according to the hoisting machine 1 of this embodiment, it is possible to prevent a decrease in the braking performance of the braking section 4 due to lubricating oil from the rope winding surface 2a.

[0029] Furthermore, in the hoisting machine 1 of this embodiment, the lubricating oil is drained by a plurality of annular protrusions 13 formed on the outer surface of the drive sheave 2, eliminating the need to attach separate oil draining parts or support members to the drive sheave 2 or housing 10. Therefore, according to the configuration of this embodiment, the manufacturing cost of the hoisting machine 1 can be reduced, and workability during manufacturing and assembly can be improved. In addition, by omitting the support members for the separate oil draining parts, it becomes easy to miniaturize the hoisting machine 1.

[0030] The present invention is not limited to the embodiments described above, and various improvements and design modifications may be made without departing from the spirit of the invention. For example, the hoisting machine 1 in the above embodiment is not limited to an elevator hoisting machine, but can be applied to any hoisting machine for winding up a rope. In addition, in the hoisting machine 1 in the above embodiment, the rotor and stator may be arranged on the other side.

[0031] Furthermore, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0032] 1... Hoisting machine, 2... Drive sheave, 2a... Rope winding surface, 3... Shaft, 4... Braking part, 5... Rope, 6... Brake disc, 6a... Braking surface, 6b... Groove, 7... Brake pad, 10... Housing, 11... Cover member, 12... Oil recovery plate, 13... Protrusion

Claims

1. A drive sheave having a rope winding surface on its outer circumference for winding and unwinding the rope, A brake disc attached to one axial side of the drive sheave, The drive sheave comprises a cover member positioned between the rope winding surface and the brake disc in the axial direction of the drive sheave, which shields the brake disc from the outer circumference of the drive sheave. On the outer circumference of the drive sheave, multiple projections are formed at positions between the rope winding surface and the cover member in the axial direction, forming an annular shape in the circumferential direction of the drive sheave and projecting radially beyond the rope winding surface. Hoisting machine.

2. The cover member reaches the multiple protrusions from the rope winding surface and receives the oil scattered from the protrusions by the centrifugal force caused by the rotation of the drive sheave on the other side in the axial direction. The hoisting machine according to claim 1.

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