JP6694843B2 - Electric hoist for crane - Google Patents

Description

  The present invention relates to an electric hoist for a crane.

  An electric hoist is a hoisting device for a crane that hoists and conveys a suspended load.The electric hoist drives the rotating body that hoists and lowers the suspended load, and the rotation speed of the output shaft of the electric motor is transmitted via a gear. And a speed reducer that decelerates to obtain high torque. Patent Document 1 describes an electric hoist for a crane having the above configuration.

JP, 10-291785, A

  By the way, in the electric hoist, grease is applied to the teeth to lubricate the gears, but the consistency of the grease that can be used is limited.

  Specifically, when the consistency of the grease is low, the grease has a high viscosity and no fluidity, so that the grease is hard to flow to other parts and has good adhesion to the tooth surface. Therefore, wear of the gear is unlikely to occur. On the other hand, even if the grease on the tooth surface is exhausted, it is not replaced with the surrounding grease, and the deteriorated grease containing a large amount of wear powder of the gear continues to stay on the tooth surface. As a result, wear and damage of the gears are promoted.

  On the other hand, when the consistency of the grease is high, the grease has low viscosity and fluidity, so that the grease easily flows to other parts, and the adhesion to the tooth surface is poor. This can result in gear wear and damage.

  For this reason, in order to maintain the lubricity of the tooth surface and suppress the wear and damage of the gear, special attention must be paid to the consistency of the grease.

  Patent Document 1 does not mention that there is a restriction on the consistency of the grease that can be used to maintain the lubricity of the tooth surface.

  An object of the present invention is to maintain the lubricity of tooth surfaces and suppress wear and damage of gears even when the consistency of usable grease is limited.

  An electric hoist for a crane according to an aspect of the present invention includes a speed reducer that adjusts a rotation speed of a drum around which a wire rope for hanging a load is wound, and the speed reducer is rotatably supported. A gear, and a fin fixed to the gear shaft of the gear, the fin is rotated by the rotation of the gear, the grease present in the reducer to the tooth surface of the gear. It is characterized by supplying.

  An electric hoisting machine for a crane according to an aspect of the present invention includes an electric motor that rotationally drives a drum around which a wire rope for hanging a load is wound, and a speed reducer that adjusts a rotational speed of the drum. The machine includes a gear that is rotatably supported, a shaft coupling that connects a drive shaft of the electric motor and a driven shaft of the speed reducer to transmit a rotational force to the drum, and a fin fixed to an outer periphery of the shaft coupling. And the fin rotates by the rotation of the shaft coupling to supply the grease existing inside the speed reducer to the tooth surface of the gear.

  According to one aspect of the present invention, even if the consistency of grease that can be used is limited, it is possible to maintain the lubricity of the tooth surface and suppress wear and damage of the gear.

It is an appearance perspective view of the whole construction of a crane with an electric hoist. FIG. 3 is a partial cross-sectional view of the overall configuration of the electric hoisting machine of the first embodiment. FIG. 3 is a cross-sectional view of the speed reducer in the electric hoisting machine according to the first embodiment. It is a top view of the gear with fins. It is a top view of the gear with fins. It is a figure which shows the structure of a fin. It is a figure which shows the other structure of a fin. 7 is a cross-sectional view of a speed reducer in an electric hoisting machine according to a second embodiment. FIG. It is a top view of a shaft coupling with fins. It is a figure which shows the structure of a fin.

  Embodiments will be described below with reference to the drawings.

  Example 1 will be described with reference to FIGS.

First, the overall configuration of a crane with an electric hoist will be described with reference to FIG.
As shown in FIG. 1, the traveling rails 11a and 11b are arranged so as to face each other in pairs. On the traveling rail 11a, a crane saddle 20a having traveling drive wheels 25a and driven wheels 26a is installed so as to be capable of traveling. On the traveling rail 11b, a crane saddle 20b having traveling driving wheels 25b and driven wheels 26b is installed so as to be capable of traveling. The crane saddles 20 a and 20 b are connected by the girder 10.

  The electric trolley 2 is installed on the girder 10 so as to be movable on the girder 10, and is further provided with a saddle control unit 12 that controls the crane saddles 20a and 20b. The electric trolley 2 is attached with an electric hoist 1 for vertically moving a suspended load, and the electric hoist 1 is provided with a crane hook 4 for suspending a suspended load.

  The electric hoist 1 includes a hoist control unit 5 that controls the electric hoist 1 and the electric trolley 2, and an operation input device 3 for operating a crane with the electric hoist.

Next, the operation of the crane with the electric hoist will be described with reference to FIG.
When the operator inputs an operation using the operation input device 3, the hoisting machine control unit 5 controls the movement of the electric hoisting machine 1 and the electric trolley 2 according to the input control signal. As a result, the suspended load attached to the crane hook 4 is moved in the Z direction and the -Z direction or the X direction and the -X direction.

  Similarly, the saddle control unit 12 controls the movement of the crane saddles 20a and 20b in response to a control signal input from the operation input device 3 to load the suspended load attached to the crane hook 4 in the Y direction and the -Y direction. Move to.

Next, with reference to FIG. 2, the overall configuration of the electric hoist 1 of the first embodiment will be described.
As shown in FIGS. 2 and 3, the electric hoisting machine 1 is rotatably supported inside the hoisting machine frame 30 by a shaft 34, and is rotationally driven by a driving device to wind up and unwind a wire rope 36. It has a drum 37. An electric motor 31 as a drive device for rotating the drum 37, a brake 35 as a braking mechanism of the electric motor 31, and a speed reducer 40 for adjusting the rotational speed of the drum 37 are combined and attached to the outside of the hoisting machine frame 30. ing.

  The drive shaft 32 of the electric motor 31 and the driven shaft 41 of the speed reducer 40 are connected by a shaft coupling 33, and the rotation is transmitted. The shaft 34 of the drum 37 is connected to the final stage of the gear of the speed reducer 40, and the drum 37 rotates by using the power of the electric motor 31.

  Inside the speed reducer 40, a gear 42a rotatably supported by ball bearings 45a and 45b, a grease 43 applied to the tooth surface and surroundings for lubrication of the gear 42a, and a rotation of the gear 42a are synchronized. A fin 44a that rotates by rotating is provided.

  Further, inside the speed reducer 40, a gear 42b rotatably supported by a ball bearing 45c, a grease 43 applied to the tooth surface and the periphery for lubrication of the gear 42b, and a rotation of the gear 42b are synchronized. A fin 44b that rotates in a rotating manner is provided. Thus, one or more ball hair rings and gears and fins are provided.

Next, the grease supply operation of the electric hoisting machine 1 according to the first embodiment will be described with reference to FIGS.
In the electric hoist 1 of the first embodiment, the grease is supplied by rotating the fins 44a and the fins 44b. Since the fins 44a and the fins 44b have the same structure, only the structure of the fins 44a will be described with reference to FIGS.

  The fins 44a are fixed to the shaft outer peripheral portion of the gear 42a so as not to rotate with respect to the cylindrical center axis of the gear 42a. Specifically, external teeth are cut on the outer peripheral portion of the shaft of the gear 42a, and internal teeth are cut on the inner diameter of the fins 44a in accordance with the external teeth of the gear 42a. Then, by inserting the external teeth of the gear 42a into the internal teeth of the fin 44a, the teeth of the fins are meshed with each other, and the fins 44a are fixed so as not to rotate with respect to the cylindrical center axis of the gear 42a.

  As shown in FIG. 6, a fin-shaped protrusion is formed on the outer peripheral side of the fin 44a, and the gear 42a is rotated by the electric motor 31 so that the fin 44a fixed to the gear 42a rotates together. As the fins 44a rotate, the blade-shaped projections of the fins 44a scrape out the grease 43, and create a flow in the rotation axis direction to send out the grease 43. The fin 44a repeatedly supplies the grease 43 to the tooth surface of the gear 42a every time the gear 42a rotates.

  At this time, the position of the fin 44a on the cylindrical center axis of the gear 42a is located on one end surface or both end surfaces of the fin 44a when the fin 44a is inserted into a position where the fin 44a is fixed to the gear 42a.

  As shown in FIG. 4, by fitting the retaining ring 46 into the circumferential groove provided on the outer peripheral portion of the shaft of the gear 42a, the fins 44a do not move along the outer peripheral portion of the shaft of the gear 42a in the cylindrical central axis direction. So that it is preferably fixed. In this way, by fitting the retaining ring 46, the reaction force when the grease 43 is sent out in the rotation axis direction by the rotation of the fin 44a is received, and the fin 44a moves in the direction opposite to the direction in which the grease 43 is sent out. It can be prevented from moving.

  Further, in order to fix the fin 44a, a substantially hollow columnar collar 47 as shown in FIG. 5 may be used. Specifically, the fins 44a are arranged so as to be sandwiched between the tooth surface end portion of the gear 42a and the end surface of the shaft coupling 33. Then, the fins 44a are fixed by a substantially hollow columnar collar 47 rotatably attached by the shaft outer peripheral portion of the gear 42a so as not to move in the cylinder central axis direction.

  Even when the substantially hollow cylindrical collar 47 is used, it is possible to prevent the fins 44a from moving in the direction opposite to the direction in which the grease 43 is sent out. The same effect can be obtained when the collar 47 is integrated with the fin 44a.

An example of the modification of FIG. 6 will be described with reference to FIG. 7.
Hereinafter, differences from FIG. 6 will be described, and description of common parts will be omitted.

  As shown in FIG. 7, the main surface of the fin 44a is inclined so that the thickness of the outer peripheral portion is smaller than the thickness of the central portion. As a result, the amount of grease 43 sent to the gear 42a can be adjusted.

  The fin 44b is thicker than the fin 44a in FIG. 6 from the central portion to the outer peripheral portion, but is made hollow in the drawing. By making it hollow, the weight of the entire fin 44b can be reduced. On the other hand, when the fin 44b is made solid, the rigidity of the main surface of the fin 44b can be improved. Moreover, since the thickness of the bearing at the center of the main surface of the fin 44b can be increased, the fin 44b and the driven shaft 41 can be easily fixed to each other.

  By gradually reducing the thickness from the central portion of the main surface of the fin 44b to the outer peripheral portion, the grease 43 applied to the main surface can be easily flowed by the rotational force of the fin 44b. That is, as compared with the fin 44a in FIG. 6, of the grease 43 contacting the main surface, a portion close to the surface is pushed to the outer peripheral side by the rotational force of the shaft, but a portion close to the wing-shaped protrusion side is The rotating force of the wing-shaped protrusions facilitates returning the grease 43 to the shaft center side. This makes it easier to circulate the grease 43 on the front surface side and the wing-shaped protrusion portion side.

  In the first embodiment, the lubricity of the tooth surface of the gear 42a is maintained and wear and damage of the tooth surface are maintained without paying special attention to the consistency of the grease 43 of the speed reducer 40 constituting the electric hoisting machine 1. Can be suppressed. Furthermore, the gear 42a of the reduction gear 40 that constitutes the electric hoist 1 can be downsized.

Second Embodiment A second embodiment will be described with reference to FIGS.
In the second embodiment, as shown in FIGS. 8 to 10, the fins 44a are fixed to the outer diameter of the shaft coupling 33 arranged near the gear 42a so as not to rotate with respect to the cylindrical center axis of the shaft coupling 33. Has been done. Here, the shaft coupling 33 has a substantially hollow cylindrical shape that connects the drive shaft 32 and the driven shaft 41 and transmits a rotational force.

  External teeth are cut on the outer diameter of the shaft joint 33, and inner teeth are cut on the inner diameter of the fins 44a in accordance with the outer teeth of the shaft joint 33. The inner teeth of the fins 44a have the shaft joint 33. Inserting the external teeth causes the teeth to mesh with each other. As a result, the fin 44a is fixed so as not to rotate with respect to the central axis of the cylinder of the shaft coupling 33.

  As shown in FIG. 10, the fins 44a are formed with blade-shaped projections, and when the shaft coupling 33 is rotated by the drive shaft 32, the fins 44a fixed to the shaft coupling 33 also rotate. By the rotation of the fins 44a, the blade-shaped projections of the fins 44a scrape out the grease 43, and the grease 43 is sent out by creating a flow in the rotation axis direction.

  At this time, the shaft coupling 33 is arranged at a position where the grease 43 flows toward the gear 42a. In this way, the fins 44a can repeatedly supply the grease 43 to the tooth surface of the gear 42a each time the shaft coupling 33 rotates.

  As shown in FIG. 9, by fitting the retaining ring 46 into the circumferential groove provided on the outer diameter of the shaft coupling 33 located on one end surface or both end surfaces of the fin 44a, the fin 44a is moved outside the shaft coupling 33. It is preferable to fix the diameter so that the diameter does not move in the central axis direction of the cylinder. In this way, by fitting the retaining ring 46, the reaction force when the grease 43 is sent out in the rotation axis direction by the rotation of the fin 44a is received, and the fin 44a moves in the direction opposite to the direction in which the grease 43 is sent out. It can be prevented from moving.

  In the second embodiment, the lubricity of the tooth surface of the gear 42a is maintained and wear and damage of the tooth surface are maintained without paying special attention to the consistency of the grease 43 of the speed reducer 40 constituting the electric hoist 1. Can be suppressed. Furthermore, the gear 42a of the reduction gear 40 that constitutes the electric hoist 1 can be downsized.

  In the above embodiment, the fin 44a may have an adjusting mechanism that is movable in the axial direction. For example, the fin 44a is provided with a tooth in the fitting portion of the shaft and the hole, and the tooth having the outer diameter of the gear shaft and the tooth having the inner diameter of the fin 44a are meshed with each other so that the fin 44a does not rotate with respect to the gear shaft To do. Then, the fins 44a move the positions of the teeth of the fitting portions provided on the gear shaft in the axial direction, whereby the fins 44a are configured to be movable in the axial direction by the same distance as the moved teeth.

  Alternatively, the fin 44a has a screw thread on the inner diameter that is the fitting portion of the shaft and the hole, and the screw thread on the outer diameter of the gear shaft meshes with the screw thread on the inner diameter of the fin 44a. The fin 44a may be axially movable by rotating the fin 44a along the thread meshing with the gear shaft by fastening the gear shaft and the fin 44a to the screw thread.

  Alternatively, the fin 44a is fixed so as not to rotate by inserting a key into a key groove provided on the gear shaft, and the fin 44a moves in the axial direction at the position of the key groove provided on the gear shaft. Thereby, the fins 44a may be configured to be movable in the axial direction by the same distance as the moved groove.

DESCRIPTION OF SYMBOLS 1 ... Electric hoist, 2 ... Electric trolley, 3 ... Operation input device, 4 ... Crane hook, 5 ... Hoisting machine control part, 10 ... Girder, 11a, 11b ... Running rail, 12 ... Saddle control part, 20a, 20b ... Crane saddle, 25a, 25b ... Traveling drive wheels, 26a, 26b ... Driven wheels, 30 ... Hoisting machine frame, 31 ... Electric motor, 32 ... Drive shaft, 33 ... Shaft coupling, 34 ... Shaft, 35 ... Brake, 36 ... Wire rope, 37 ... Drum, 40 ... Reducer, 41 ... Drive shaft, 42a, 42b ... Gear, 43 ... Grease, 44a, 44b ... Fin, 45a, 45b, 45c ... Ball bearing, 46 ... Retaining ring, 47 …Color

Claims (10)

An electric hoist for a crane having a speed reducer for adjusting the rotational speed of a drum around which a wire rope for hanging a suspended load is wound,
The speed reducer is
A rotatably supported gear,
A fin fixed to the gear shaft of the gear,
The fin is rotated by the rotation of the gear, and supplies the grease existing inside the speed reducer to the tooth surface of the gear ,
An electric hoisting machine for a crane, wherein the main surfaces of the fins are inclined so that the thickness of the outer peripheral portion is smaller than the thickness of the central portion . The fin has a blade-shaped protrusion on the outer periphery,
The crane according to claim 1, wherein the blade-shaped protrusion is rotated by the rotation of the fin to scrape out the grease existing inside the speed reducer and repeatedly supply the grease to a tooth surface of the gear. Electric hoist.   The electric hoisting machine for a crane according to claim 1, further comprising a fixing member that fixes the fin so as not to move in the axial direction of the gear shaft.   The electric hoisting machine for a crane according to claim 3, wherein the fixing member is constituted by a retaining ring inserted into a circumferential groove provided in the gear shaft.   The electric hoisting machine for a crane according to claim 3, wherein the fixing member is formed of a hollow cylindrical collar provided on at least one end surface of the fin. An electric hoist for a crane having a motor for rotating a drum wound with a wire rope for hanging a load, and a speed reducer for adjusting the rotational speed of the drum,
The speed reducer is
A rotatably supported gear,
A shaft coupling that connects a drive shaft of the electric motor and a driven shaft of the speed reducer to transmit a rotational force to the drum,
A fin fixed to the outer periphery of the shaft coupling,
The fin is rotated by the rotation of the shaft coupling to supply the grease present inside the speed reducer to the tooth surface of the gear ,
An electric hoisting machine for a crane, wherein the main surfaces of the fins are inclined so that the thickness of the outer peripheral portion is smaller than the thickness of the central portion .   The electric hoisting machine for a crane according to claim 6, wherein the shaft coupling has a hollow columnar shape and is arranged near the gear. The fin has a blade-shaped protrusion on the outer periphery,
7. The crane according to claim 6, wherein the rotation of the fin rotates the blade-shaped projection to scrape out the grease existing inside the speed reducer and repeatedly supply the grease to the tooth surface of the gear. Electric hoist.   The electric hoisting machine for a crane according to claim 6, further comprising a fixing member that fixes the fin so as not to move in the axial direction of the drive shaft.   The electric hoisting machine for a crane according to claim 9, wherein the fixing member includes a retaining ring provided on the shaft coupling.

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