JPH08308177A - Motor with speed reducer - Google Patents

Abstract

PURPOSE: To prevent the shortening of the service life of a speed reducer while the leakage of lubricating oil from the speed reducer is prevented by forming an annular groove round the shaft inserting hole of the main body of the motor in the recessed section of the speed reducer and fitting an O-ring in the groove. CONSTITUTION: An annular groove 19 is formed round the shaft 13 inserting hole 18 of the main body 11 of a motor in the recessed section 17 of a speed reducer 15 and an O-ring 20 is fitted in the groove 19. Then the projecting section 14 of the main body 11 is put in the recessed section 17 of the speed reducer 15. Therefore, the speed reducer 15 can be fixed to the main body 11 without scratching the O-ring 20. Since the O-ring 20 is held between the groove 19 of the speed reducer 15 and projecting section 14 of the main body 11, the space between the main body 11 and speed reducer 15 is sealed and the leakage of lubricating oil coming out from the speed reducer 15 to the outside is prevented and the shortening of the service life of the speed reducer 15 itself can also be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor with a speed reducer, and more specifically, a protrusion is provided on the front side of the motor body and a recess is provided on the back side of the speed reducer, and an O-ring is provided on the protrusion and the recess. The present invention relates to an electric motor with a speed reducer, which is located between the electric motor and the electric motor, and has the protruding portion fitted in the concave portion.

[0002]

2. Description of the Related Art Conventionally, various types of electric motors with reduction gears have been proposed. As one of the electric motors with a speed reducer, there is an electric motor 1 with a speed reducer as shown in FIG. This electric motor 1
Then, around the front of the electric motor main body 2, the shaft 3
On the other hand, the concave portion 6 is provided on the back surface of the speed reducer 5, and while the protrusion 4 of the electric motor main body 2 is fitted into the concave portion 6 of the speed reducer 5, the O-ring 7 is connected to the electric motor. It is arranged in an annular space formed between the peripheral end of the protrusion 4 of the main body 2 and the peripheral end of the recess 6 of the speed reducer 5. O
The ring 7 seals between the motor body 2 and the speed reducer 5,
The lubricating oil from the speed reducer is prevented from leaking to the outside.

[0003]

By the way, in the conventional electric motor 1 with a speed reducer, the protrusion 4 of the electric motor body 2 is connected to the speed reducer 5.
There is a problem that the O-ring 7 is damaged by the protrusion when the O-ring 7 is fitted into the recess 6, and the sealing property of the O-ring 7 is deteriorated. Therefore, it is impossible to sufficiently prevent the lubricating oil from leaking to the outside by the O-ring 7, and there is a drawback that the lubricating oil leaks to the outside and the life of the reduction gear 5 itself is shortened. The present invention has been made in view of the above circumstances, while sufficiently preventing external leakage of lubricating oil from the reducer,
An object of the present invention is to provide an electric motor with a speed reducer that can prevent a reduction in the life of the speed reducer.

[0004]

According to the present invention, in order to achieve the above object, an annular step portion is formed around the front surface of a motor body, and a projecting portion is formed around the shaft thereof.
On the other hand, a flange portion is provided so as to project around the rear surface of the speed reducer, a recess is provided in the flange portion, and an O-ring is positioned between the protrusion and the recess so that the protrusion of the electric motor body is In the electric motor with a speed reducer fitted in the recess of the speed reducer, an annular groove centered on the through hole of the shaft of the electric motor body is formed in the recess of the speed reducer, and O is formed in the annular groove.
It is configured with a ring attached.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric motor with a speed reducer according to the present invention will be described in detail below with reference to the accompanying drawings. Figure 1
1 shows an embodiment of an electric motor with a reducer according to the present invention. The electric motor 10 with a speed reducer according to the present embodiment has an annular step portion 12 formed around the front surface of the electric motor body 11 and a protrusion 14 formed around the shaft 13 thereof, while the rear surface of the speed reducer 15 is provided. A flange portion 16 is provided so as to surround the periphery, and a recess 17 is provided in the flange portion. further,
An annular groove 19 centered on the insertion hole 18 of the shaft 13 of the electric motor body 11 is formed in the recess 17 of the speed reducer 15, and an O-ring 20 is mounted in the annular groove, and the electric motor body 11 projects in this state. The portion 14 is fitted in the recess 17 of the speed reducer 15. Thereby, the speed reducer 15 can be fixed to the electric motor main body 11 without damaging the O-ring 20. Moreover, since the O-ring 20 is sandwiched between the annular groove 19 of the speed reducer 15 and the protruding portion 14 of the electric motor body 11, the O-ring 20 is held by the O-ring.
The space between and is sealed, the leakage of lubricating oil from the speed reducer to the outside is prevented, and the life of the speed reducer 15 itself can be prevented from being shortened.

[0006]

As described above, according to the electric motor with reduction gear of the present invention, the annular step portion is formed around the front surface of the electric motor main body, and the projecting portion is formed around the shaft thereof, while the other is formed. , A flange is provided around the rear surface of the speed reducer, a recess is provided in the flange, and an O-ring is positioned between the protrusion and the recess to reduce the speed of the protrusion of the electric motor body. In the electric motor with reduction gear fitted in the concave portion of the machine, an annular groove centered on the insertion hole of the shaft of the electric motor body is formed in the concave portion of the reduction gear, and an O-ring is mounted in the annular groove. Since it is configured, the following effects can be obtained. That is, in the present invention, when fitting the protruding portion of the electric motor main body into the recess of the speed reducer, there is no possibility of hitting the protruding portion of the electric motor main body with the O ring, and thus the O ring is damaged. The speed reducer can be fixed to the electric motor body without the need. Moreover, since the O-ring is sandwiched between the annular groove of the speed reducer and the protruding portion of the electric motor body, the O-ring seals the electric motor body and the speed reducer and exits from the speed reducer. It is possible to prevent the lubricating oil from leaking to the outside and to prevent the life of the speed reducer itself from being shortened. As described above, the present invention has a simple structure in which the O-ring is mounted in the annular groove formed in the recess of the speed reducer, which is easy to implement and inexpensive to implement.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electric motor with a reducer according to the present invention.

FIG. 2 is a cross-sectional view showing a main part of a conventional electric motor with reduction gear.

[Explanation of symbols]

 10 Electric Motor with Reducer 11 Electric Motor Main Body 12 Annular Step 13 Shaft 14 Projection 15 Reducer 16 Flange 17 Recess 18 Insertion Hole 19 Annular Groove 20 O-ring

Claims (1)

[Claims] 1. An annular step portion is formed around a front surface of an electric motor main body to form a protruding portion around a shaft thereof, while a flange portion is provided so as to protrude around a rear surface of the speed reducer. An electric motor with a reducer, in which a recess is provided in the portion, and an O-ring is located between the protrusion and the recess so that the protrusion of the electric motor body is fitted into the recess of the speed reducer. An electric motor with a speed reducer, characterized in that an annular groove centered on an insertion hole of the shaft of the electric motor body is formed in the recess, and an O-ring is mounted in the annular groove.