JPH0529260U - Reducer case for electric motor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a reduction gear case that can be mounted on a plurality of types of electric motors having different dimensions. [Structure] A plurality of spigot parts 10i are provided at one end of a speed reducer case.
1 and 10i2 are installed concentrically. The reduction gear case is positioned with respect to the electric motor main body by fitting one of these spigot parts to a cylindrical case mounting portion provided on the electric motor main body side. Since a plurality of spigot parts are provided, it can be attached to a plurality of types of electric motors having different sizes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reducer case for an electric motor that houses a reducer coupled to an output shaft of the electric motor.

[0002]

[Prior Art]

 In a motor with a speed reducer, a speed reducer case is screwed to the end of the motor body, and the speed reduction mechanism is housed in the speed reducer case. Since it is necessary to strictly position the reducer case and the motor body, a cylindrical reducer case mounting part is generally provided at the end of the motor body, and the spigot part provided on the reducer case side is attached to the mounting part. By fitting them, the speed reducer case is positioned with respect to the electric motor body.

FIGS. 4A and 4B show a half 1 of a reduction gear case that has been conventionally used. The case half 1 has a substantially square cross section, and its bottom wall 1 a. An annular neck portion 1b projecting toward the electric motor body (not shown) is provided at the center of the. A cylindrical bearing holding portion 1c is provided inside the neck portion 1b, and the bearing holding portion 1c and the neck portion 1b are connected by a radially provided rib 1d. A gap 1e between the neck portion 1b and the bearing holding portion 1c is a ventilation window. The four corners of the case half 1 are provided with holes 1f through which bolts for fixing other case halves to be assembled on the open end side of the case half 1 are inserted.

A spigot portion 1i having a cylindrical surface 1g concentrically surrounding the bearing holding portion 1c and an annular abutting surface 1h orthogonal to the axial direction is formed at the end of the neck portion 1b. . The cylindrical surface 1g of the spigot portion is fitted to the inner circumference of a cylindrical case mounting portion provided on the side of the electric motor main body (not shown), and the abutting surface 1h is projected to the end of the case mounting portion of the main body of the electric motor. When applied, the reducer case is positioned relative to the motor body. The mounting portion 1b is also provided with a mounting hole 1j, and the reduction gear case is fixed to the motor body by a bolt screwed through the mounting hole 1j into a screw hole provided on the motor body side. A bearing is held in the bearing holding portion 1c, and the rotating shaft of the electric motor main body is supported by the bearing.

[0005]

[Problems to be solved by the device]

 In the conventional speed reducer case, since only one spigot part is provided, the size of the case mounting part on the side of the electric motor main body that can be mounted is specified. Therefore, it is necessary to prepare different reducer cases for each different size of the case mounting part on the motor body side.For motors with different specifications, the same reducer can be used even if the reduction ratio is the same. There was a problem that it could not be installed.

An object of the present invention is to provide a reducer case for an electric motor that can be attached to a plurality of types of electric motors having different dimensions of the mounting portion of the reducer case.

[0007]

[Means for Solving the Problems]

 The present invention has a spigot part at one end which is fitted to a cylindrical case mounting part provided on the electric motor body side, and is positioned with respect to the electric motor main body by fitting the spigot part and the case mounting part. The present invention relates to a reduction gear case for an electric motor.

In the present invention, a plurality of spigot portions having different diameters are concentrically provided so that the spigot can be attached to a plurality of types of electric motors having different case attachment portions.

[0009]

[Action]

 If multiple spigot parts are concentrically provided as described above, they can be mounted on multiple types of electric motors having different case mounting part sizes, which makes it possible to standardize the reducer case and reduce costs. It can be reduced. Also, since it is possible to combine multiple types of electric motors in the same speed reducer, it is possible to select a combination of speed reducer and electric motor that is suitable for the load.

[0010]

【Example】

 1 (A) and 1 (B) show a half portion of a reduction gear case according to an embodiment of the present invention. The case half portion 10 has a square cross section similar to that shown in FIG. An annular neck portion 10b is provided at the center of the bottom wall portion 10a. A bearing holding portion 10c is provided inside the neck portion 10b, and the bearing holding portion 10c and the neck portion 10b are connected by a rib 10d.

A first spigot portion 10i1 and a second spigot portion 10i2 are provided concentrically on the outer peripheral portion of the end portion of the neck portion 10b with the positions thereof shifted stepwise in the axial direction. The first inlay portion 10i1 is composed of a cylindrical surface 10g1 provided at the end of the neck portion 10c and an annular abutting surface 10h1 orthogonal to the axial direction, and the second inlay portion 10i2 is the first inlay portion It is composed of a cylindrical surface 10g2 having a diameter larger than that of the cylindrical surface 10g1 and an abutting surface 10h2. The neck portion 10b is also provided with a mounting hole 10j for inserting a bolt for mounting the case on the electric motor body, and a mounting hole 10k for inserting a screw for fixing a component housed in the case.

As shown in FIG. 2, another case half 11 is butted against the opening end of the case half 10 and is provided on the case half 11 through holes 10 f provided at the four corners of the case half 10. The case halves 10 and 11 are fastened by bolts 12 screwed into the screw holes. The case halves 10 and 11 form a speed reducer case 13.

The speed reducer case 13 is attached to the electric motor main body 20 as shown in FIG. The motor body 20 shown in FIG. 2 includes a cylindrical yoke 21, an end cover 22 attached to one end of the yoke 21, a fixed field magnet 23 fixed to the inner circumference of the yoke 21, and an end cover 22. A rotary shaft 25, one end of which is supported by a bearing 24 held by a bearing holding portion provided on the rotary shaft 25, a rotor 26 mounted on the rotary shaft 25, a commutator 27 mounted on the rotary shaft 25, and an end. And a brush 29 supported by a brush holder 28 attached to the cover 22 and brought into contact with the commutator 27. The yoke 21 and the end cover 22 form a housing of the electric motor main body, and the end of the yoke 21 opposite to the end cover serves as a case mounting portion 21a.

The reducer case 13 has its spigot portion fitted to the case mounting portion 21a and positioned with respect to the electric motor main body. In the example shown in FIG. 2, the spigot portion 10i2 on the outer side of the reduction gear case 13 is fitted to the inner circumference of the case mounting portion 21a. Although not shown, the yoke 21 is provided with a screw hole which is aligned with the mounting hole 10j of the reduction gear case, and the case half portion 10 is fastened to the yoke 21 by the screw screwed into the screw hole through the mounting hole 10j. Has been done.

A bearing 30 is held in a bearing holding portion 10c provided in the case half portion 10, and the other end of the rotary shaft 25 is supported by this bearing. A gear reduction mechanism is housed in the reduction gear case 13, and the other end of the rotary shaft 25 is connected to the input portion of the reduction mechanism. The output shaft 31 of the reduction gear mechanism extends through the end wall of the half 11 of the reduction gear case to the outside.

FIG. 3 shows an example in which the speed reducer case 13 according to the present invention is attached to a motor body 20 'which is smaller than that shown in FIG. 2, and in this example also, the housing of the motor body 20' is An end of a cylindrical yoke 21 'which constitutes a part serves as a case mounting portion 21a', and an inlay portion 10i1 inside the reduction gear case is fitted to the inner circumference of the case mounting portion 21a '.

In FIG. 3, reference numeral 22 ′ is an end cover that constitutes the housing of the motor main body together with the yoke 21 ′, 23 ′ is a fixed field attached to the inner circumference of the yoke 21 ′, and 24 ′ is held by the end cover 22 ′. Bearings, 25 'is a rotary shaft holding a rotor 26', 27 'is a commutator attached to the rotary shaft 25, and 29' is a brush held by the end cover 22 '. Other points are the same as the example shown in FIG.

In each of the above-described embodiments, the end portion of the cylindrical yoke 21 or 21 ′ provided on the electric motor main body 20 or 20 ′ serves as a case mounting portion into which the spigot portion of the reduction gear case is fitted. The half case 10 of the reducer case 13 also serves as an end cover of the electric motor main body. However, a separate end cover for closing the end of the electric motor main body on the speed reducer side is separately provided, and the end on the speed reducer side is provided. The present invention can be applied to the case where the reducer case is mounted on the cover. In this case, a cylindrical case mounting portion may be provided on the end surface of the end cover on the speed reducer side, and the spigot portion 10i1 or 10i2 may be fitted into the case mounting portion.

In the above embodiment, two spigot parts are provided, but more spigot parts may be provided.

In addition, in the above embodiment, each spigot portion is formed so as to continuously extend in the circumferential direction, but each spigot portion does not necessarily have to be continuous in the circumferential direction, and the spigot portion on the motor body side is not necessarily required. A plurality of positioning portions having a cylindrical surface that can be fitted to the provided case mounting portion and an abutting surface that abuts the case mounting portion from the axial direction may be provided at intervals in the circumferential direction.

[0021]

[Effect of the device]

 As described above, according to the present invention, it is possible to concentrically provide a plurality of inlay portions to be fitted to the case mounting portion of the electric motor main body, and to mount the electric motor on a plurality of types of motors having different case mounting portion sizes. As a result, the reduction gear case can be standardized, and the cost can be reduced. Further, according to the present invention, it becomes possible to combine a plurality of types of electric motors in the same speed reducer, so that it is possible to select a combination of the speed reducer and the electric motor suitable for the load.

[Brief description of drawings]

FIG. 1A is a front view showing a half portion of a speed reducer case according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line XX of FIG.

FIG. 2 is a partial cross-sectional side view showing a state where the speed reducer case according to the present invention is attached to an electric motor.

FIG. 3 is a side view showing a state in which the speed reducer case according to the present invention is attached to another electric motor with a partial cross section.

FIG. 4A is a front view showing a half of a conventional speed reducer case, and FIG. 4B is a sectional view taken along line YY of FIG.

[Explanation of symbols]

10, 11 ... Case half part, 10i1, 10i2 ... Inlay part, 13 ... Reduction gear case, 20, 20 '... Electric motor main body,
21a, 21a '... Case mounting portion.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A spigot which is fitted to a cylindrical case mounting portion provided on the side of the electric motor body is provided at one end, and the spigot portion and the case mounting portion are fitted to each other and positioned with respect to the electric motor body. An electric motor reduction gear case, wherein the spigot parts are concentrically provided with different diameter dimensions.