JP2016060354A - Wheeled gear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a reduction gear part cannot be miniaturized because of need to increase the shaft diameter of an output shaft, and to increase the size of a bearing that supports the output shaft to secure the shaft strength of the output shaft or a bearing life since an excessive radial load applied on a wheel acts directly on the output shaft of a gear motor, and to prolong the life of the bearing that supports the output shaft.SOLUTION: A wheel gear motor includes a motor part 10 as the driving source; a gear case 21, having a built-in deceleration mechanism connected with the motor part and an integrally formed hollow cylindrical wheel holding part 21a that makes an output shaft 22 of the deceleration mechanism pass through; a wheel 31 mounted on the outer peripheral surface of the wheel holding part via a bearing; and a rotation transmission member (wheel flange 42) that transmits the rotation of the output shaft to the wheel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheeled gear motor used, for example, as a drive device for a bogie device.

  2. Description of the Related Art Conventionally, in a wheel drive device such as a cart device, a wheeled gear motor having a structure in which a wheel is directly attached to an output shaft of a gear motor has been widely employed for the purpose of cost reduction and ease of maintenance. For example, an in-wheel motor drive provided with a speed reduction part that decelerates and outputs the rotation of the motor part, a wheel hub bearing part that transmits the output from the speed reduction part to the wheels, and a casing that houses the motor part and the housing of the speed reduction part In the apparatus, a casing fixing member fixed to the casing and a housing fixing member fixed to the housing of the reduction unit are provided between the casing and the housing of the reduction unit, and the casing fixing member and the housing fixing member are elastic members. There is a structure in which the housing of the speed reduction portion is held in a floating state with respect to the casing by adhering them to each other (see Patent Document 1).

Japanese Patent No. 5564608 (pages 6-9, FIG. 1)

  The invention of Patent Document 1 is intended to suppress the occurrence of vibration between the casing of the speed reducer and the housing of the speed reducer accommodated in the casing, thereby achieving quietness. In the method of attaching the wheels directly to the output shaft, the excessive radial load applied to the wheels acts directly on the output shaft of the gear motor, so the shaft diameter of the output shaft is reduced to ensure the shaft strength of the output shaft and the life of the bearing. There is a problem that it is necessary to increase the size of the bearing that supports the output shaft and to increase the size of the output shaft. In addition, extending the life of a bearing that supports an output shaft that cannot be easily replaced has been a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wheeled gear motor capable of reducing the size of the reduction gear and extending the service life.

  The wheeled gear motor according to the present invention includes a motor as a drive source and a speed reduction mechanism connected to the motor, and a hollow cylindrical wheel holding portion through which the output shaft of the speed reduction mechanism is inserted. And a rotation transmission member for transmitting the rotation of the output shaft to the wheel. .

  According to the present invention, a hollow cylindrical wheel holding portion through which an output shaft is inserted is integrally formed in a gear case having a built-in speed reduction mechanism, and a wheel is attached to the outer peripheral surface of the wheel holding portion via a bearing. The wheel is driven by the output shaft protruding from the wheel holding portion, thereby preventing an excessive radial load applied to the wheel from directly acting on the output shaft and supporting the output shaft and the output shaft. It is possible to easily reduce the size of the speed reducer by reducing the size of the bearing. Further, the life of the bearing that supports the output shaft can be extended.

It is principal part sectional drawing which shows roughly the gear motor with a wheel by Embodiment 1 of this invention. It is a reference figure for the comparison which shows the structural example of the conventional gear motor with a wheel.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing a main part of a gear motor with wheels according to Embodiment 1 of the present invention. In the figure, the gear motor with wheels is composed of a motor part 10 which is a drive source, a speed reducer part 20, a wheel part 30 and a transmission part 40. The speed reducer portion 20 is configured such that the output shaft 22 is inserted into the insertion portion of the output shaft 22 in a gear case 21 that houses and holds a speed reduction mechanism using a plurality of gears that are not illustrated in detail, and the wheel portion 30 on the outer peripheral surface. Is formed integrally with a hollow cylindrical wheel holding portion 21a. The output shaft 22 is supported by a bearing 23 provided on a bracket of the motor portion 10 and a bearing 24 disposed at the inner left end portion of the wheel holding portion 21a in the drawing, and an output shaft end portion 22a for taking out driving force is It protrudes to the right side of the figure.

  The wheel portion 30 includes a ring-shaped wheel 31 having a flange portion 31 a formed on the inner diameter side of the shaft end, and two axially spaced bearings 32 and 33 fitted to the inner peripheral surface of the wheel 31. ing. The wheel portion 30 is mounted so that the inner rings of the bearings 32 and 33 are fitted to the outer peripheral surface of the wheel holding portion 21a, and is configured to receive the radial load A applied to the wheel 31 by the wheel holding portion 21a. ing. And the transmission part 40 which transmits rotation of the output shaft 22 to the wheel 31 is fixed to the output shaft end part 22a by the fixing means 41, and the wheel flange 42 which is a rotation transmission member for transmitting power by rotating, The connecting bolt 43 is inserted into a plurality of locking holes provided in the circumferential direction of the flange surface 42 a of the wheel flange 42 and fastened to a screw hole provided in the flange portion 31 a of the wheel 31. The transmission unit 40 has a function of smoothly transmitting the rotational force by absorbing the displacement between the rotation shafts of the output shaft 22 and the wheel 31.

  In the illustrated example, the wheel holding portion 21a has a structure cast integrally with the gear case 21 main body, but is not necessarily limited to the integral casting structure. For example, a hollow cylinder corresponding to the wheel holding portion 21a. It can also be configured by joining other parts of the shape to the gear case 21 main body by welding or the like. Further, the configuration of the motor part 10 and the speed reducer part 20, the motor drive system, the control circuit, and the like are parts that can be used by appropriately selecting, for example, a well-known conventional technique, and thus illustration and detailed description thereof are omitted. To do.

  In the first embodiment configured as described above, the wheel 31 including the bearings 32 and 33 is supported by the hollow cylindrical wheel holding portion 21a constituting the gear case 21 of the reduction gear portion 20, and the wheel 31 and the output are supported. The structure in which the shaft 22 is coupled by the wheel flange 42 prevents an excessive radial load A applied to the wheel 31 from directly acting on the output shaft 22, and the output shaft 22 and the bearing 23 that supports the output shaft 22. , 24 can be reduced in size, the reduction gear part 20 can be reduced in size and weight, and the life of the bearings 23 and 24 supporting the output shaft 22 can be increased. Further, by incorporating the bearings 32 and 33 in the wheel 31, the consumable part wheel 31 and the bearings 32 and 33 can be easily and simultaneously replaced, and the maintenance performance can be greatly improved.

  FIG. 2 is a reference diagram for comparison showing a structural example of a conventional wheeled gear motor. As shown in FIG. 2, in the conventional method, wheels 31 are directly attached to the output shaft 22 of the gear motor for the purpose of cost reduction and ease of maintenance. In this case, the radial load A applied to the wheel 31 directly acts on the output shaft 22 of the gear motor. Therefore, in order to ensure the shaft strength of the output shaft 22 and the life of the bearings 23 and 24 that support the output shaft 22, the output shaft It is necessary to increase the shaft diameter of 22 and to increase the size of the bearings 23 and 24.

  As described above, according to the first embodiment, the hollow cylindrical wheel holding portion 21a through which the output shaft 22 is inserted is integrally formed in the gear case 21 in which the speed reduction mechanism is built, and the outer periphery of the wheel holding portion 21a. A wheel 31 incorporating bearings 32 and 33 is mounted on the surface, and the wheel 31 is driven by the output shaft 22 protruding from the gear case 21 via a wheel flange 42 as a rotation transmission member. The excessive radial load A applied to the wheel, which has been a problem in the structure of the gear motor with wheels, is prevented from directly acting on the output shaft 22, and the size of the output shaft 22 and the bearings 23 and 24 supporting the output shaft 22 are reduced. Thus, it is easy to reduce the size and weight of the speed reducer portion 20. In addition, a significant effect is obtained such that the life of the bearings 23 and 24 that support the output shaft 22 that cannot be easily replaced can be extended.

  It should be noted that each of the configurations and methods of the motor portion 10, the speed reducer portion 20, the wheel portion 30 and the transmission portion 40 illustrated in the figure, the types of members used, and the like may be appropriately modified or changed within the scope of the present invention. It goes without saying that it is possible. Further, the application of the present invention is not particularly limited to the cart apparatus.

  10 motor part, 20 reduction gear part, 21 gear case, 21a wheel holding part, 22 output shaft, 22a output shaft end part, 23 bearing, 24 bearing, 30 wheel part, 31 wheel, 31a flange part, 32 bearing, 33 bearing, 40 transmission part, 41 fixing means, 42 wheel flange (rotation transmission member), 42a flange surface, 43 connecting bolt, A radial load.

Claims (3)

  A motor as a drive source; a gear case having a built-in speed reduction mechanism coupled to the motor; and a hollow cylindrical wheel holding portion through which an output shaft of the speed reduction mechanism is inserted; and the wheel holding portion A wheeled gear motor comprising: a wheel mounted on the outer peripheral surface of the wheel through a bearing; and a rotation transmission member that transmits the rotation of the output shaft to the wheel.   The wheeled gear motor according to claim 1, wherein the rotation transmission member includes a wheel flange that connects the output shaft and the wheel.   The wheeled gear motor according to claim 1 or 2, wherein the bearing and the wheel incorporating the bearing are formed to be exchangeable with respect to the wheel holding portion.

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