TWI665395B - Reducer and orthogonal gear motor provided with the same - Google Patents

Abstract

The present invention provides a speed reducer capable of arbitrarily and simply changing the position of a torque arm afterwards.

The gear motor 100 is provided with a speed reducer 20, and the intermediate shaft 40 is pivotally supported by a first bracket-side bearing 30 provided on the first bracket 24 and a second bracket-side bearing 34 provided on the housing 22, and a second bracket 26 Only the final output shaft bearing 38 of the final output shaft 50 is supported. Therefore, the orientation of the second bracket 26 can be arbitrarily rotated about the center of the final output shaft 50, and can be rotated in the circumferential direction of the final output shaft 50. The position of the torque arm 28 provided on the second bracket 26 can be changed arbitrarily, simply and afterwards.

Description

Reducer and orthogonal gear motor provided with the same

The present invention relates to a speed reducer connected to a motor, and more particularly to an orthogonal gear motor (hereinafter, also referred to simply as a "gear motor") in which the axial direction of the input shaft of the motor is orthogonal to the axial direction of the output shaft of the reduction gear. Speed reducer.

Regarding gear motors, there are orthogonal gear motors (hereinafter, sometimes referred to as "gear motors"), which have a reduction gear that is configured to respond to torque from an input shaft of the motor through a worm gear ( Gears such as worm gear, bevel gear, hypoid gear, face gear, etc. communicate with each other in a gear mechanism orthogonal to the axial direction, and the final output shaft axis direction is the same as the input shaft of the motor The axis direction is orthogonal. As examples of such an orthogonal gear motor, there are those shown in Patent Documents 1 and 2.

Patent Document 1: Japanese Patent Application Publication No. 2012-80771

Patent Document 2: Japanese Patent Laid-Open No. 2000-35106

The gear motor of Patent Document 1 includes a pinion gear formed on an input shaft of the motor, and a face gear composed of a gear whose axis direction is orthogonal to the pinion, and torque is transmitted through a plurality of parallel shaft gear mechanisms. It is transmitted to the hollow output shaft. The housing (symbol 30) of the reducer of the gear motor is composed of a casing (symbol 31) and a bracket (symbol 31b) embedded in the casing. The intermediate shaft (symbols 33 and 36) and the hollow output shaft (symbol 39) are made of balls embedded in the housing and the bracket, respectively. Bearing shaft support.

The gear motor of Patent Document 2 includes a pinion gear formed on an input shaft of the motor, and a halberd gear composed of a gear whose axis direction is orthogonal to the pinion gear, and transmits torque to a hollow output shaft via a parallel shaft gear mechanism. . The housing of the gear motor reducer is also composed of a housing and a bracket similar to the housing of Patent Document 1. The intermediate shaft (symbol 118) and the hollow output shaft (symbol 126) are respectively embedded in the housing and the bracket. Ball bearing shaft support of the frame.

However, a torque arm is generally provided in a speed reducer so that the gear motor itself does not rotate by using a reaction force when the driven shaft is rotated by driving of the gear motor.

In the case of the gear motors of Patent Documents 1 and 2, since the ball bearings for the shaft support intermediate shaft and the hollow output shaft are embedded in the bracket, the bracket can only be fitted in a predetermined direction relative to the housing.

Therefore, when the torque arm is provided on the bracket, the position of the torque arm is fixed, and even if it is assumed that the position of the torque arm is to be changed due to the installation location, the position cannot be changed afterwards.

On the other hand, a reduction gear is also required to be miniaturized.

Therefore, in view of the problems of the conventional technology described above, the present invention provides a reduction gear capable of changing the position of a torque arm arbitrarily and simply and afterwards, and a gear motor provided with the reduction gear. For the purpose.

The present invention solves the above-mentioned problems by a reducer and an orthogonal gear motor including the same. The reducer includes: a casing, a motor attached; a first output gear; and a first transmission gear that transmits torque from the motor. An input gear meshes with the first input gear in the axial direction Orthogonal; a second input gear provided on an intermediate shaft to which the first output gear is fixed; and a final output shaft having the same axial direction as the intermediate shaft is provided with a final output gear that meshes with the second input gear; It is characterized in that the intermediate shaft is composed of a first bracket-side bearing provided on a first bracket embedded in the housing from one side of the final output shaft in the axial direction, and opposite to the second input gear. The second bracket-side bearing shaft of the housing, which is provided at a position opposite to the first bracket-side bearing, is provided with the first output gear and the second input in order from the first bracket side. Gear; the outer diameter of the second bracket side bearing is smaller than the diameter of the bottom circle of the second input gear; the final output shaft is embedded by the casing and the other side from the axial direction of the final output shaft The final output shaft provided in the housing and provided on the second bracket provided with the torque arm is supported by a bearing shaft.

According to the present invention, since the intermediate shaft is supported by the first bracket-side bearing provided in the first bracket and the second bracket-side bearing provided in the housing, and the second bracket only has the final output of the shaft support As the bearing for the final output shaft of the shaft, the direction of the second bracket can be arbitrarily rotated around the axis of the final output shaft, and is fixed to the housing. Accordingly, the position of the torque arm provided on the second bracket can be arbitrarily and easily changed in the circumferential direction of the final output shaft.

In addition, since the outer diameter of the second bracket-side bearing is smaller than the diameter of the bottom circle of the second input gear, the second input gear can be simply meshed with the final output gear, so assembly is also easy.

In addition, as long as it is provided with a central bearing located between the first output gear and the second input gear and provided on the shaft support intermediate shaft of the housing, and the diameter of the tooth end circle of the second input gear is smaller than the outer diameter of the central bearing The structure can stably support the intermediate shaft. In addition, the gear ratio between the second input gear and the final output gear is maintained in the original state, and the gears can be made smaller to shorten the gear ratio between them. The distance between the cores can reduce the size of the reducer.

In addition, as long as a spigot joint of a circular shape is provided on the mating surface of the housing and the second bracket, the second bracket can be easily inserted into the housing even at any position in the circumferential direction of the final output shaft. body.

In addition, as long as the bolts for fixing the second bracket to the casing are arranged at equal intervals in the circumferential direction, the second bracket can be easily fixed to the final output shaft with respect to the casing. The predetermined position in the circumferential direction.

M‧‧‧Motor

V‧‧‧ Bolt

10‧‧‧ input shaft

12‧‧‧first input gear

20, 20a, 20b‧‧‧ reducer

22, 22a, 22b‧‧‧shell

24‧‧‧First bracket

25‧‧‧Socket

26, 26a‧‧‧Second bracket

28‧‧‧ Torque arm

30‧‧‧First bracket side bearing

32‧‧‧central bearing

34, 34a‧‧‧Second bracket side bearing

36, 38‧‧‧Final output shaft bearings

40, 40a, 40b ‧‧‧ intermediate shaft

42‧‧‧First output gear

44‧‧‧Second input gear

50‧‧‧ final output shaft

52‧‧‧final output gear

54‧‧‧Sealing member

100‧‧‧ Gear Motor

FIG. 1 is a cross-sectional view of an embodiment of the present invention.

Fig. 2 is a front view of the embodiment of the present invention.

Fig. 3 (a) is a cross-sectional view of an intermediate shaft of an embodiment of the present invention; Fig. 3 (b) is a cross-sectional view of an intermediate shaft of a reference example of the present invention.

Fig. 4 is a cross-sectional view of a reference example of the present invention.

Fig. 5 is a front perspective view of an embodiment of the present invention.

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. However, the present invention is not limited to this embodiment.

As shown in FIG. 1, a gear motor 100 including a reduction gear 20 according to an embodiment of the present invention is composed of a motor M and a reduction gear 20. The reducer 20 includes a housing 22, a first bracket 24, and a second bracket 26. The motor M has an input shaft 10 of the motor M inserted from the side of the motor mounting portion 23 of the housing 22 into the housing 22 and is connected to the housing 22.

The housing 22 has an internal space that houses the intermediate shaft 40 and the final output shaft 50. In the housing 22, a first bracket 24 is fitted from one side in the axial direction of the final output shaft 50, and a second bracket 26 is fitted from the other side. The first and second brackets 24 and 26 are respectively fixed to the casing, and it is preferable to perform appropriate sealing treatment between the casing 22 and the first bracket 24 and the second bracket 26.

A first bracket-side bearing 30 is provided on the first bracket 24, and a second bracket is provided on the housing 22 so as to be located on the side opposite to the first bracket-side bearing 30 with respect to the second input gear 44 described below. The frame-side bearing 34 is provided with a center bearing so as to be located between the first output gear 42 and the second input gear 44. The intermediate shaft 40 is pivotally supported by a first bracket-side bearing 30, a center bearing 32, and a second bracket-side bearing 34. In the gear motor 100, the first bracket-side bearing 30 and the center bearing 32 are ball bearings, and the second bracket-side bearing 34 is a sliding bearing. By providing the center bearing 32, it is possible to stably support the intermediate shaft 40 compared to a configuration in which it is not provided.

The second bracket 26 is provided with a final output shaft bearing 38 (for convenience of description, referred to as a "first final output shaft bearing 38"), and the housing 22 is provided with a final output shaft bearing 36 (for convenience The description is called "the second final output shaft bearing 36"). The final output shaft 50 is supported by a first final output shaft bearing 38 and a second final output shaft bearing 36. Both the first and second final output shaft bearings are ball bearings. Between the housing 22 and the second bracket 26 and the final output shaft 50, seal members 54 and 54 are provided on the outer sides of the first and second final output shaft bearings 38 and 36 with respect to the housing 22, respectively. Thereby, since the inside of the case 22 is sealed, lubricating oil can be sealed inside the case 22. The second bracket 26 is provided with a torque arm 28 (see also FIG. 2).

The input shaft 10 is provided with a first input gear 12 that transmits torque from the motor M. When the motor M is attached to the housing 22, the first input gear 12 meshes with the first output gear 42 fixed to the intermediate shaft 40 as shown in the figure. The intermediate shaft 40 is provided with a second input gear 44, a second input gear 44, and a final output gear provided on the final output shaft 50. 52 mesh. In this way, the torque of the motor is transmitted from the input shaft 10 to the final output shaft 50. Here, when the first output gear 42 and the second input gear 44 are mounted on the housing 22, the first output gear 42 and the second output gear 44 are sequentially arranged from the first bracket 24 side. Input gear 44.

Although the first input gear 12 and the first output gear 42 are worm gears, as long as the first input gear 12 and the first output gear 42 are orthogonal to each other in the axial direction, other cross-shaft gears may be used. In addition, the second input gear 44 and the final output gear 52 are helical gears, but other parallel shaft gears may be used as long as the axial directions of the intermediate shaft 40 and the final output shaft 50 are the same. With these configurations, the axial directions of the intermediate shaft 40 and the final output shaft 50 are the same, and the axial direction of the input shaft 10 of the motor M is orthogonal to the axial direction of the final output shaft 50.

The speed reducer 20 has the above-mentioned structure. In particular, the intermediate shaft 40 is supported by the first bracket-side bearing 30 provided on the first bracket 24 and the central bearing 32 and the second bracket-side bearing 34 provided on the housing. Therefore, only the first final output shaft bearing 38 for the shaft-supported final output shaft 50 may be provided on the second bracket 26. Thereby, the orientation of the second bracket 26 can be arbitrarily rotated around the axial center of the final output shaft 50 and fixed to the housing 22. Accordingly, the position of the torque arm 28 provided on the second bracket 26 can be arbitrarily and easily changed in the circumferential direction of the final output shaft 50.

At this time, as shown in FIG. 2, if the bolts V for fastening the second bracket 26 to the housing 22 are arranged at equal intervals in the circumferential direction with respect to the axial direction of the final output shaft 50, the second The bracket 26 is easily fixed to a predetermined position in the circumferential direction of the final output shaft 50 with respect to the housing 22. In addition, the fitting surface of the second bracket 26 and the housing 22 may be provided as a circular socket portion 25 (see FIG. 1). This makes it easy to fit the second bracket 26 into the housing 22 even at any position in the circumferential direction of the final output shaft 50.

Next, the outer diameter of the second bracket-side bearing 34 will be described. The outer diameter of the second bracket-side bearing 34 is smaller than the diameter of the bottom circle of the second input gear 44. Specifically, as shown in FIG. 3 (a), when the second bracket-side bearing 34 is a plain bearing, the outer diameter X of the plain bearing is set to be smaller than the diameter of the bottom circle of the second input gear 44, and When the second bracket-side bearing is a ball bearing, the outer diameter of the outer race is set to be smaller than the diameter of the bottom circle of the second input gear 44. Thereby, when the reduction gear is assembled, the second input gear 44 and the final output gear 52 can be easily meshed. Conversely, as shown in FIG. 3 (b), for example, when the outer diameter X 'of the outer ring of the second bracket-side bearing 34a which is a ball bearing is larger than the diameter of the bottom circle of the second input gear 44, As shown in FIG. 4, it is difficult to embed the final output gear 52 inside the housing 22 a, and it is difficult to mesh the final output gear 52 with the second input gear 44.

Here, as shown in FIG. 1, in the reduction gear 20 provided with the central bearing 32, if the diameter of the tooth end circle of the second input gear 44 is smaller than the outer diameter of the central bearing 32, the second input gear can be used. Keeping the gear ratio between 44 and final output gear 52 as it is, keep these gears small and shorten the core-to-core distance (distance X between points A and B in Figure 5), so the gear can be maintained The reduction ratio of the motor and the miniaturization of the reducer. In addition, according to this configuration, the intermediate shaft 40 can be fitted into the housing 22 from one side of the final output shaft 50 in the axial direction without interference between the second input gear 44 and the mounting portion 21 of the central bearing 32. . At this time, since the outer diameter of the second bracket-side bearing 34 must be smaller than the diameter of the bottom circle of the second input gear 44, the second bracket-side bearing 34, as shown in the figure, preferably uses a sliding bearing. 34. This is because sliding bearings can be more compact than ball bearings.

As described above, according to the present invention, since the orientation of the second bracket can be arbitrarily rotated around the axis of the final output shaft and fixed to the housing, it can be completed arbitrarily and easily on the final output shaft. Reduction in circumferential direction change of position of torque arm provided on second bracket The speed gear and the gear motor provided therewith can further reduce the size of the speed reducer and the gear motor provided with the same.

Claims (6)

A speed reducer comprising: a housing with a motor attached; a first output gear meshing with a first input gear that transmits torque from the motor and orthogonal to the first input gear in an axial direction; a second input gear, It is provided on an intermediate shaft to which the first output gear is fixed; and a final output shaft with the same axial direction as the intermediate shaft is provided with a final output gear that meshes with the second input gear; the intermediate shaft is characterized by: A first bracket-side bearing provided on a first bracket embedded in the housing from one side of the final output shaft in the axial direction, and a second bracket provided on the first bracket side with respect to the second input gear. The second bracket-side bearing shaft of the housing at the opposite side of the bearing is provided with the first output gear and the second input gear in order from the first bracket side; the second bracket-side bearing The outer diameter is smaller than the diameter of the tooth bottom circle of the second input gear; the final output shaft is embedded in the housing by the housing and the other side from the axial direction of the final output shaft and is provided with torque Final output of the second arm of the arm Bearing supported shaft. For example, the speed reducer of the first patent application range further includes a central bearing located between the first output gear and the second input gear, and provided on the casing to support the intermediate shaft; the second input gear The diameter of the tooth end circle is smaller than the outer diameter of the central bearing. For example, the reducer of the first or second patent application scope, wherein a circular socket is provided on the fitting surface of the casing and the second bracket. For example, the speed reducer of the first or second patent application range, wherein the bolts for fixing the second bracket to the housing are arranged at equal intervals in the circumferential direction with respect to the axial direction of the final output shaft. For example, the reducer of the third scope of the patent application, wherein the bolts for fixing the second bracket to the housing are arranged at equal intervals in the circumferential direction with respect to the axial direction of the final output shaft. An orthogonal gear motor is a motor attached to a casing of a reducer according to any one of claims 1 to 5.