JP2529253B2 - Gear reducer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear reducer for an electric motor used as a drive source for industrial machines and the like.

2. Description of the Related Art Conventionally, an electric motor and a gear reducer are often used in combination to drive an industrial machine or the like.

Hereinafter, an example of the conventional gear reducer as described above will be described with reference to the drawings.

FIG. 3 is a sectional view of a conventional gear reducer. In FIG. 3, 1 is a gear box, 21 is a bearing holding plate on the output shaft side, 3 is a bearing holding plate on the input shaft side, and 5 is an electric motor. An input shaft consisting of a rotating shaft, 6a and 6b are gears, 7 is a gear shaft, 8 is an output shaft, 9a and 9b are bearings, 22 is a set screw for a bearing holding plate 21, and 23 is a gearbox. Through hole for passing the setscrew 22, 24
Is a seal washer.

Further, FIG. 4 shows a state in which a conventional gear reducer of an electric motor is incorporated into a drive electric motor, 11 is a drive electric motor, 12 is a fitting portion between the gear reducer and the bracket 13 of the electric motor, and 14 is O-rings, 15 and 16 are bolts and nuts for fixing the reducer and the frame 17 of the electric motor.

FIG. 5 is a sectional view of another conventional gear reducer for an electric motor, in which 30 serves as a gear box and an electric motor bracket.

The operation of the gear reducer configured as described above will be described below with reference to FIGS. 3, 4, and 5.

Rotational force is transmitted from the input shaft 5 to the output shaft 8 via the gear 6a, the gear shaft 7, and the gear 6b.

The gear shaft 7 is held by the bearing holding plates 3 and 21 via the bearings 9a and 9b, and the bearing holding plates 3 and 21 receive the load generated on the gear shaft 7 by the transmission of the rotational force. A set screw 22 for fixing 21 to the gear box 1 is configured to be received.

Further, in the conventional example of FIG. 5, the bracket portion of the electric motor 11 and the gear box of the gear reducer are integrally formed.

Problems to be Solved by the Invention However, in the above-mentioned configuration, it is necessary to provide the gear box 1 with the through hole 23 for passing the set screw 22 for fixing the bearing support plate 21. Further, since the set screw 22 is fixed by the female screw 25 provided on the gear holding plate 21 which is a thin mild steel plate, the tightening strength is weak. Then, under severe conditions such as a load being applied to the set screw 22 to transmit the rotational force of the gear and receiving a shock generated on the load side, the set screw 22 that has been tightened loosens. For this reason, in the case of using grease bath lubrication that uses soft and fluid grease to lubricate the gears in order to reduce noise and prolong service life, the grease should be loosened from the through hole 23 of the setscrew 22 to the outside of the gear box. It had a problem of leaking to.

Further, the number of combinations of various types of electric motors having different functions and various types of gear reduction gears having different reduction ratios is an enormous number, which is a combination of the number of types of electric motors and the number of types of gear reduction gears.

However, if the system separates the electric motor and the gear reducer, and provides a fitting part for incorporating in the electric motor and the gear reducer, if it is a system that combines various electric motors and a gear reducer of each reduction ratio, The number of types of reduction gears should be the number of types of electric motors and the number of types of gear reduction gears, which is much smaller than the number of types of electric motors and the number of types of gear reduction gears. There are advantages.

In the conventional example of FIG. 5, the bracket of the electric motor and the gear box 30 of the gear reducer are integrally formed, and the gear reducer and the electric motor 11 cannot be separated. Therefore, in the case of the conventional example shown in FIG. 5, the number of types due to the difference in function is a product of the number of types of electric motors and the number of types of gear reducers, which is enormous. It had a problem that the cost becomes high.

Means for Solving the Problems In order to solve the above problems, the gear reducer of the present invention is
A gear box having an opening fitted to a bracket that supports a rotating shaft of an electric motor, an O-ring that seals the fitting portion, a rotating shaft of the electric motor as an input shaft, and a rotational force of the input shaft as an output shaft. A required number of reduction gears and gear shafts for transmission,
A planar first bearing having a bearing that supports the gear shaft and the output shaft, and a plurality of through holes that hold the outer circumference of the bearing on the input shaft side.
Bearing holding plate and a second bearing holding plate having a convex surface for receiving the end face of the input side bearing, and the gear box connects the bracket of the electric motor to the opening on the input shaft side. And a non-penetrating female screw for fixing the bearing holding plate, and a bearing housing for holding the bearing on the output shaft side is provided integrally with the gear box on the inner surface on the output shaft side. The plate is fixed to the gear box with a set screw, and an oil seal is provided on the output shaft penetrating portion of the gear box.

Action The present invention has the above-described structure, in which a bearing holding plate is not used to hold the bearing on the output shaft side, the housing of the bearing is directly provided in the gear box, and the housing holding the bearing and the gear box are integrated, The through hole for the set screw that fixes the bearing holding plate from the gear box is eliminated. As a result, low noise
In order to extend the service life, no grease leakage occurs even if a grease bath lubrication using a soft and fluid grease is used for gear lubrication.

In addition, a bearing holding plate is provided on the input shaft side to separate the electric motor and the gear reducer to facilitate the combined use of various types of motors with different functions and multiple types of gear reducers with different reduction ratios. is there.

Embodiment A gear reducer according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a gear reducer according to an embodiment of the present invention.

In FIG. 1, 1 is a gear box with one surface opened, 2 is a bearing housing on the output shaft side, and 3 is a flat mild steel plate having a plurality of through holes for holding the outer diameter of the bearing 9a on the input shaft side. The first bearing holding plate is attached to the opening of the gear box 1. Reference numeral 4 denotes a second bearing holding plate attached to the first bearing holding plate 3 that holds the end face of the bearing 9a on the input shaft side, and receives the bearing end face to secure a gap with the first bearing holding plate 3. The surface is formed in a convex shape. Reference numeral 5 is an input shaft made of a rotating shaft of an electric motor, 6a and 6b are gears for transmitting the power of the input shaft 5 to the output shaft 8 via the gear shaft 7, and 9b is a bearing on the output shaft side held by the bearing housing 2. , 10 are oil seals.

Further, FIG. 2 shows a state in which the gear reducer of one embodiment of the present invention is incorporated in a drive electric motor, 11 is a drive electric motor, 12 is a bracket of the gear box 1 and the electric motor 11 of the gear reducer.
13 is a fitting portion, 14 is an O-ring interposed in the fitting portion 12, 15 and 16 are bolts and nuts for fixing the gear box 1 of the gear reducer and the frame 17 of the electric motor 11, and 18 is provided on the bracket 13. It is an oil seal.

The operation of the gear reducer configured as above will be described with reference to FIG.

From the input shaft 5 which is the rotary shaft of the electric motor, the rotational force is the gear 6a,
It is transmitted to the output shaft 8 via the gear shaft 7 and the gear 6a.

Further, the gear shaft 7 is held by the bearing housing 2 and the bearing holding plates 3 and 4 of the gear box 1 via the bearing 9b, and receives the load generated on the gear shaft 7 by the transmission of the rotational force.

By providing the output shaft side bearing housing 2 integrally with the gear box 1 on the inner surface of the gear box 1, the opening of the gear box 1 is provided only on the one surface of the input shaft side and the penetrating portion of the output shaft 8. Removed the through hole for the set screw. As a result, under severe load conditions, the tightening of the set screw of the bearing holding plate 3 is loosened, and the grease inside the gear box does not leak to the outside of the gear box 1 through the set screw through hole.

Further, the first bearing holding plate 3 on the input shaft side is provided with a female screw 19 having a sufficient depth in the gear box 1 and a set screw 20 is used to set the gear box 1
Since it can be firmly fixed to, the set screw 20 will not loosen.

In addition, the bearing holding on the input side is the first
The bearing receiving plate 3 and the second bearing holding plate 4 for holding the bearing end surface of the second component disperse the load received from the bearing 9a to increase the strength of the bearing holding plate.

Further, by providing a fitting portion 12 between the gear box 1 and the electric motor 11, and further holding the bearing 9a on the input shaft side by the bearing holding plates 3 and 4, the gear reducer is configured in a state separated from the electric motor 11. it can.

Further, since the electric motor 11 and the gear reducer are assembled, the O-ring 14 is attached to the fitting portion 12, the fitting is performed, and the bolt 15 and the nut 16 are tightened. It is easy to use various types of gear reducers of different types in combination.

EFFECTS OF THE INVENTION As described above, according to the present invention, the first flat bearing holding plate having a plurality of through holes for holding the bearing outer diameter of the input shaft side bearing, and the surface for receiving the bearing end face are the first A second bearing holding plate formed in a convex shape to secure a gap with the bearing holding plate, a fitting portion for connecting a bracket of the electric motor to the opening on the input shaft side, and the bearing holding plate are fixed. By providing a gear box with a non-penetrating female screw and a bearing housing that holds the bearing on the output shaft side on the inner surface on the output shaft side, high strength and long life are achieved, and the bearing holding plate on the output shaft side is provided. By eliminating the through hole of the fixing internal thread for fixing, the grease leakage is prevented even when the grease bath lubrication using the soft and fluid grease is used for the lubrication of the gear.

In addition, by separating the electric motor and the gear reducer so that they can be used in combination, the number of types is significantly reduced compared to the case where the electric motor and the gear reducer are integrated, improving productivity and reducing costs such as distribution inventory. Is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gear reducer of an electric motor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which the gear reducer is incorporated into a drive motor, and FIG. 3 is a conventional electric motor. FIG. 4 is a cross-sectional view of the gear reducer, FIG. 4 is a cross-sectional view showing a state in which the conventional gear reducer of the electric motor is incorporated in the drive motor, and FIG. 5 is a cross-sectional view of the gear reducer of another conventional electric motor. . 1 ... Gear box, 2 ... Bearing housing, 3,4 ... Bearing holding plate, 5 ... Input shaft, 6a, 6b ... Gear, 7 ... Gear shaft,
8 ... Output shaft, 9a, 9b ... Bearing, 10 ... Oil seal, 1
1 …… motor, 12 …… fitting part, 13 …… bracket, 14…
… O-ring, 19 …… Female thread, 20 …… Set screw.

Claims (1)

(57) [Claims] 1. A gear box in which an opening is fitted to a bracket that supports a rotating shaft of an electric motor, an O-ring that seals the fitting portion, and a rotating shaft of the electric motor as an input shaft. A required number of reduction gears and a gear shaft for transmitting force to the output shaft, and a bearing that supports the gear shaft and the output shaft.
A first flat bearing holding plate having a plurality of through holes for holding the outer circumference of the input shaft side bearing, and a second bearing holding plate having a convex surface for receiving the end face of the input side bearing. The gear box is provided with a fitting portion for coupling the bracket of the electric motor to the opening on the input shaft side, and a non-penetrating female screw for fixing the bearing holding plate, and the inner surface on the output shaft side. A bearing housing that holds a bearing on the output shaft side is provided integrally with the gear box, the bearing holding plate is fixed to the gear box with a set screw, and a gear having an oil seal in the output penetrating portion of the gear box. Decelerator.