JPS6333005Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, geared motors have been widely used to drive various machines, but the output torque is approximately constant,
In order to be used in a model where the output shaft rotational speed is significantly reduced, a gear reducer electric motor is provided with a mounting seat for the motor on the outside and an input gear on the inside that can be engaged with the pinion part of the motor rotation shaft. A motor mounting mount that cooperates with the mounting base to form a hollow casing is attached, and a gear transmission mechanism for decelerating and driving the input gear by the electric motor attached to the mount is built into the hollow casing. Then, it is necessary to sandwich a sheet gasket between the motor mounting seat and the motor mounting base to prevent oil leakage, which reduces the mounting rigidity of the motor mounting base to the motor mounting seat and causes vibration of the mounting base. Not only is this easy, but the gear transmission mechanism may also generate noise.

The present invention addresses this problem by rigidly fixing a motor mounting base 3 provided with a skirt portion 8 to the motor mounting seat 2 of the gear reducer 1 so as to cooperate with the motor mounting seat 2 to form a hollow casing. , a gear transmission mechanism for decelerating and driving the input gear 5 on the gear reducer side by the electric motor 4 mounted thereon is installed in the motor mounting frame, and a cylindrical body 6 surrounding the gear transmission mechanism is mounted as an electric motor. An elastic packing 7 is provided integrally within the frame 3 and is compressed and clamped between the open end of the cylindrical body and the motor mounting seat 2 to form a space between the cylindrical body 6 and the skirt portion 8. It is characterized by

An embodiment of the present invention will be further explained below with reference to the drawings. The input gear 5 is press-fitted into an intermediate shaft 10 that is rotatably mounted in the outer casing 9 of the gear reducer 1, and the intermediate shaft 10 is connected to the outer casing 9 through a reduction gear transmission mechanism.
The output shaft 11 is rotatably attached to the output shaft 11. Reference numerals 12 and 13 indicate gears of a reduction gear transmission mechanism fixed to shafts 10 and 11, respectively, and reference numerals 9a, 9b, etc. indicate reinforcing ribs provided within the outer casing 9. Motor mounting seat 2
is integrally provided in the outer casing 9 so that a pinion portion at the tip of a rotating shaft of a first electric motor (not shown) attached to the first electric motor (not shown) with bolts meshes with the input gear 5.
14 is a bearing for the first electric motor rotating shaft.

The electric motor mounting frame 3 integrally includes a skirt portion 8 and a cylindrical body 6 surrounded by the skirt portion 8 on the side opposite to the motor mounting side of a dish-shaped mounting seat portion 15 on which the second electric motor 4 is mounted with appropriate bolts. As shown in the figure, the open end of the skirt portion 8 is fitted into the outer periphery of the motor mounting seat 2 with a bolt, and is directly and rigidly fixed to the outer casing 9 with bolts.

Reference numeral 16 denotes a shaft rotatably supported by a bearing 17 attached to the mounting seat 15 in the cylindrical body 6 and the bearing 14 on the outer casing 9 side, and a gear 18 press-fitted into the shaft 16 is supported. , the pinion portion 19 at the tip of the rotating shaft of the second electric motor 4 attached to the mounting base 3 is engaged,
Further, the pinion portion 20 at the tip of the shaft 16 meshes with the input gear 5 inside the outer casing 9.

The annular elastic packing 7, which is compressed and clamped between the open end of the cylindrical body 6 and the packing contact surface 2a of the motor mounting seat 2, has a U-shaped cross section as shown in FIG. When attaching the electric motor mounting stand 3 to the outer casing 9, it is preferable that the elastic packing 7 is tightly held by covering the open end of the cylindrical body 6 by its own elasticity. Note that 7a and 7b are crushed by the end surface of the cylindrical body 6 and the packing contact surface 2a,
These are protruding strips that protrude into and out of the elastic packing 7, respectively.

In the figure, 21 is a bearing of the rotating shaft of the second electric motor 4;
2 and 23 are bearings at both ends of the intermediate shaft 10, and 24 and 25 are bearings at both ends of the output shaft 11. Of course, the inside of the outer casing 9 and the cylindrical body 6 are filled with grease.

The present invention has the above configuration, and when obtaining a speed reducer with a relatively high rotational speed of the output shaft 11, the mounting base 3
Instead, attach the first electric motor directly to the mounting seat 2,
When the pinion portion of the motor rotation shaft is meshed with the input gear 5 and the rotation speed of the output shaft 11 is to obtain a reducer with a relatively low rotation speed, the second motor (the first motor (The same electric motor may be used)
4 is attached, and a reduction gear mechanism 1 is installed between the rotating shaft of the electric motor 4 and the pinion portion 20 that meshes with the input gear 5.
9 and 18 are inserted.

In the present invention, leakage of the grease filled in the cylindrical body 6 is prevented by an elastic packing 7 which is compressed and clamped between the open end of the cylindrical body and the mounting seat 2, and the skirt of the motor mounting frame 3 is Since the part 8 is rigidly fixed directly to the mounting base 2, the mounting base part 1 of the mounting base is
5 is reinforced by the cylindrical body 6 acting as a rib, and the mounting rigidity of the mounting base 3 is significantly increased.
Even if the rotational speed of the electric motor 4 is high, there is no fear that the mounting base 3 will vibrate, and since the reduction gear mechanisms 19 and 18 are double surrounded by the cylindrical body 6 and the skirt portion 8, noise is not transmitted to the outside. The transmission is also reduced accordingly, and it is also possible to provide a sound absorbing layer on the inner periphery of the skirt portion. Furthermore, since the gap between the inner wall of the cylindrical body 6 filled with grease and the gears 18 and 19 can be made smaller, not only the amount of grease required is reduced, but also the gears are well lubricated. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of an elastic packing. 10...Intermediate shaft, 11...Output shaft, 15...Mounting seat plate, 16...Shaft, 18...Gear, 19,2
0...Pinion part.

Claims (1)

[Scope of utility model registration request] In a gear reducer in which a motor mounting seat is provided on the outside and an input gear that can be engaged with the pinion portion of the motor rotating shaft is provided on the inside, a hollow A motor mounting frame 3 provided with a skirt portion 8 to form a housing is rigidly fixed, and the input gear 5 on the gear reduction gear side is driven by the electric motor 4 mounted on the motor mounting frame.
A gear transmission mechanism for decelerating and driving is installed, and a cylindrical body 6 surrounding the gear transmission mechanism is integrally provided in the motor mounting frame 3, and an elastic force is provided between the open end of the cylindrical body and the motor mounting seat 2. A reduction ratio changing device for a gear reduction gear, characterized in that a packing 7 is compressed and clamped, and a space is formed between a cylindrical body 6 and a skirt portion 8.