JP2005280975A5 - - Google Patents

Description

Unloading device

  The present invention relates to an unloading device such as a chain block mainly having a connection support structure for a drive motor shaft and a small gear shaft.

The conventional unloading device mainly composed of an electric chain block device has been improved several times to meet the demand for smaller size and lighter weight. One of them is the motor shaft length (generally horizontal width) as much as possible. For shortening, a small gear shaft 5 having a first small gear 4 connected to a motor shaft 3 of the drive motor 2 and rotating integrally with the motor shaft 3 shown in FIG. A speed reduction portion 7 having a first large gear 6 that meshes with the gear 4, a second small gear 8 that rotates integrally with the first large gear 6, and a small gear that meshes with the second small gear 8. A second large gear 9 supported through the shaft 5 and a chain for winding a load suspension means (not shown) such as a chain and a wire for lifting and lowering a load provided integrally with the second large gear 9. The unwinding device 60 includes an equal winding unit 10, and the unloading device 60 includes a small gear shaft 5 and a motor shaft 3. In the connection support structure, a motor shaft key groove 51 is provided on the connection side of the motor shaft 3, and a small gear shaft key groove 53 is provided on the connection side of the small gear shaft 5 connected thereto. A key-protruded connecting part 54 formed by connecting the shaft shaft groove 51 to the motor shaft 3 and the small gear shaft 5 is provided. The key-protruding connecting part 54 is supported by a bearing 55, and one side of the motor shaft 3 is provided. Is supported by a bearing 38 via a key-protruded coupling component 54 and does not include a bearing that directly supports the motor shaft 3.
That is, by not providing a bearing that directly supports the motor shaft 3, the lateral width of the apparatus can be shortened accordingly, and the apparatus can be reduced in size and weight.

In the prior art described above, a key-protruded connecting part 54 formed by connecting the motor shaft 3 and the small gear shaft 5 is provided, and the key-protruding connecting part 54 is supported by the bearing 38, and the key groove connecting part of the motor shaft 3 51 is fitted and supported by the key convex connecting part 54 and does not have a bearing for directly supporting the motor shaft 3, so that the key groove connecting part 51 and the key convex connecting part 54 are fitted and supported. However, there is a drawback that the rotor 16 of the drive motor 2 may swing and come into contact with the stator 34 because the gap becomes larger with use. In order to avoid the problem, the parts must be finished with extremely high accuracy, resulting in high cost and low reliability.
Further, in the configuration of the unloading device 60, the weight is balanced so that the right and left balance can be obtained and the device can be kept horizontal in a state where the hanging bracket 15 is attached to the hanging portion 15 and the 60 is suspended from the beam or the like. Therefore, if a bearing is provided that directly supports the motor shaft 3 while maintaining this balance, the motor shaft 3 will be lengthened correspondingly, and the weight balance will be lost, resulting in a suspended state inclined to the motor side. In order to solve this problem, it is necessary to attach a balance weight to the speed reduction portion, which causes a problem that the apparatus is increased in size, weight, and cost.
As described above, there has been a problem in a technology for realizing stable and high-precision rotation of the motor rotor without causing an increase in size, weight, and cost of the unloading apparatus packed with downsizing.
In addition, the conventional unloading measures have been reduced in size and weight to the limit, but still further reduction in size and weight is always pursued as an important technical issue.

SUMMARY OF THE INVENTION The present invention has been made in view of the above disadvantages of the prior art, and an object of the present invention is to provide an unloading device that realizes stable and high-precision rotation of a motor rotor without increasing the size, weight, and cost of the device. .
Another object of the present invention is to provide an unloading device that achieves further miniaturization and weight reduction.

The above and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are for explanation only and do not limit the technical scope of the present invention.

  To achieve the above object, the present invention provides a reduction gear having a drive motor, a small gear shaft having a small gear coupled to the motor shaft of the drive motor and rotating integrally, and a large gear meshing with the small gear. And a lifting device for lifting a chain that lifts and lowers the load by decelerating and rotating by the speed reduction unit, the connection support structure for connecting the small gear shaft and the motor shaft includes the motor shaft. A coupling portion of the small gear shaft that is coupled with the coupling portion of the motor shaft in a fitting manner so that the motor shaft and the small gear shaft rotate integrally, and coupling of the small gear shaft And an unloading device that is the connection support structure including a bearing that directly supports the motor shaft at a portion close to the component part of the drive motor rotor.

  As is clear from the above description, the present invention has the following effects.

(1) The connection support structure of the small gear shaft and the motor shaft is fitted with the connection portion of the motor shaft and the connection portion of the motor shaft so that the motor shaft and the small gear shaft rotate integrally. A connecting support structure comprising: a connecting portion of the small gear shaft connected by a shaft; and a bearing that directly supports the motor shaft at a portion close to the connecting portion of the small gear shaft and the constituent portion of the drive motor rotor. So
Since either one of the small gear shaft connection part or the motor shaft connection part is provided with a fitting connection hole, one side of the shaft does not require a protruding connection part for connection, and the one side accordingly. As a result, it is possible to shorten the shaft connection length of the motor, and as a result, a connection support with a bearing mounting space that provides a bearing that directly supports the motor shaft without changing the occupied width of the connection support structure without the space for directly supporting the motor shaft of the prior art. The effect of obtaining a structure can be obtained.
With this connection support structure, it is possible to obtain the effect of realizing the support of the motor bearing by the direct bearing without breaking the suspension balance of the device and without changing the size, weight and form of the device.
Direct support by the motor shaft bearing realizes high-precision rotation with no runout of the rotor, and it is not necessary to perform high-precision machining of the connecting part, thus reducing costs, that is, realizing low cost and high reliability. The effect of doing can be obtained.
It is also possible to shorten the shaft more than the space necessary for installation of the bearing, and in this case, it is possible to obtain the effect of realizing a smaller and lighter device.
The fitting relationship of the connecting part is not only due to about 4 to 12 key grooves, but it is possible to insert a key straddling the key grooves facing each other, the fitting relationship of a non-circular shape such as a rectangle or an ellipse, There are various types of couplings that allow the motor shaft and the small gear shaft to rotate integrally.

(2) A connection support structure that does not provide a mounting space for a bearing that directly supports the motor shaft has a connection support structure in which the motor shaft is reduced by the mounting space of the bearing. The apparatus can be reduced, and the effect of further reducing the size and weight of the apparatus can be obtained.

(3) The connecting portion of the motor shaft is in the form of a fitting hole, the connecting portion of the small gear shaft is fitted in the connecting portion of the motor shaft, and the bearing that directly supports the connecting portion of the motor shaft is the component of the drive motor. What is provided in the close position realizes a structure that can directly support the motor shaft with a bearing by providing a fitting part in the form of a fitting hole on the motor shaft side, and the small gear shaft is the required length Therefore, the effect of further reducing the size and weight of the apparatus can be obtained.

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

In the first preferred embodiment for carrying out the present invention shown in FIG. 1, reference numeral 1 denotes an unloading device, which is connected to a drive motor 2 and a motor shaft 3 of the drive motor 2. A small gear shaft 5 having a first small gear 4 that rotates integrally, a speed reduction unit 7 having a first large gear 6 that meshes with the first small gear 4, and the first large gear 6 are integrated. A second small gear 8 that rotates to the right, a second large gear 9 that is supported through a small gear shaft 5 that meshes with the second small gear 8, and the second large gear 9 that rotates together. And a chain hoisting portion 10 for hoisting a load hoisting means (not shown) such as a chain and a wire for hoisting and lowering the load provided in this manner, and connecting the small gear shaft 5 and the motor shaft 3 to each other. The support structure has a motor shaft connecting portion 11 projecting from the motor shaft 3 and a motor carved in the motor shaft connecting portion 11. The keyway 12, the small gear shaft coupling portion 13 of the small gear shaft 5 that is coupled with the motor shaft coupling portion 11 so that the motor shaft 3 and the small gear shaft 5 rotate integrally, and this The motor shaft is located as close as possible to the small gear shaft key protrusion 14 in which the motor shaft key groove 12 is fitted in the small gear shaft coupling portion 13 and the small gear shaft coupling portion 13 and the rotor 2 b of the drive motor 2. 3 is a connection support structure including a bearing 17 that directly supports the bearing 3.
Further, the connection support structure for the small gear shaft 5 and the motor shaft 3 and the bearing 17 for rotating and supporting the motor shaft 3 are arranged at positions overlapping with each other inside the winding 18 provided on the stator 34 of the drive motor 2.
Further, the bearing 17 that rotatably supports the motor shaft 3 is disposed at an overlapping position inside the convex fin 19 provided at the end of the rotor 16.
In the state where the unloading device 1 is hung on a beam or the like by the device hanging portion 15, the left and right weight balance is taken so as to be horizontal.
The bearing 39 for rotating and supporting the chain winding part 10 is supported by a support 45 provided on the housing 44, and the bearings 17 and 38 are supported by a bearing support member 46, and the bearings 17, 38, and 39 are supported. Are arranged adjacent to each other.
The “fitting form” of the “small gear shaft connected to the motor shaft connecting part in a fitting form” is not limited to the fitting form in direct contact but via an auxiliary part such as a cushioning part in between. It is also included.
(Different modes for carrying out the invention)

  Next, different modes for carrying out the present invention shown in FIGS. 2 to 3 will be described. In the description of the different modes for carrying out the present invention, the same components as those in the best first embodiment for carrying out the present invention are denoted by the same reference numerals, and redundant description is omitted.

  2 differs from the first preferred embodiment for carrying out the present invention mainly in the second preferred embodiment for carrying out the present invention shown in FIG. The unloading device 20 which is connected to the shaft 3 and does not have the bearing 17 and does not have a mounting space thereof, shortens the motor shaft 3 and shortens the lateral width of the device, thereby further reducing the size and weight. Is the point that formed.

The third preferred embodiment for carrying out the present invention shown in FIG. 3 differs from the first preferred embodiment for carrying out the present invention mainly in that the small gear shaft 5 and the motor. The motor shaft 3 is provided with a connecting portion 25 of a motor shaft in the form of a hole, and a motor shaft keyway 26 engraved in the connecting portion 25 of the motor shaft is provided. A small gear shaft connecting portion 27 in a protruding form is provided on the small gear shaft 5 that is connected to the motor shaft connecting portion 25 so as to rotate integrally with the gear shaft 5, and this small gear shaft connecting portion is provided. 27 is provided with a small gear shaft key projection 28 into which the motor shaft key groove 26 is fitted, and the motor shaft connecting portion 25 of the motor shaft 3 is located as close as possible to the connecting portion 27 of the small gear shaft and the drive motor 2. A connection support structure in which a bearing 29 that is directly supported is mounted. It lies in the formation of the lifting device 30.
In this way, by providing a coupling portion in the form of a fitting hole on the motor shaft side, it is possible to realize a configuration in which the motor shaft can be directly supported by the bearing, and the small gear shaft can be shortened to the last required length. Further reduction in size and weight can be realized.

The present invention is used in the industry for manufacturing unloading devices.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram of the best 1st Embodiment for implementing this invention. The block diagram of the best 2nd Embodiment for implementing this invention. The block diagram of the best 3rd Embodiment for implementing this invention. The block diagram of 4th Embodiment of the best for implementing this invention.

Explanation of symbols

1: Unloading device, 2: Drive motor,
3: motor shaft, 4: first small gear,
5: Small gear shaft, 6: First large gear,
7: Reduction part, 8: Second small gear,
9: Second large gear, 10: Chain winding part, etc.
11: Motor shaft coupling part, 12: Motor shaft keyway,
13: Small gear shaft connecting portion, 14: Small gear shaft key convexity,
15: Device hanging part 16: Rotor
17: Bearing, 18: Winding,
19: Fin, 20: Unloading device,
25: motor shaft connecting portion, 26: motor shaft keyway,
27: Small gear shaft connecting portion, 28: Small gear shaft key,
29: Bearing, 30: Unloading device,
33: Electromagnetic brake, 34: Stator,
35: Torque limiter, 36-43: Bearing,
44: housing, 45: support part,
46: bearing support member, 51: motor shaft keyway,
53: Small gear shaft keyway, 54: Key convex connection part,
60: Unloading device.

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