Motor, speed reducer, and gear motor

Abstract

To provide a motor, a reduction gear, and a gear motor capable of preventing grease from leaking from a bearing.SOLUTION: The gear motor 1 is formed by connecting a motor 2 and a reduction gear 3. The motor 2 includes, in the motor housing 11, a motor-side bearing 15 and a speed reducer-side bearing 16 that support the motor shaft 14, and a cylindrical motor-side boss portion 18 that holds the motor-side bearing 15. The motor-side boss portion 18 is provided with a motor-side extended portion 19. The speed reducer 3 has a cylindrical speed reducer side boss portion 23 that holds the speed reducer side bearing 16 in the speed reducer housing 21. The speed reducer side boss portion 23 is provided with a speed reducer side extended portion 24. The motor side extension part 19 and the reduction gear side extension part 24 are provided with a grease receiving part 20 for receiving grease so that the grease sealed in each bearing does not leak.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a motor, a reducer, and a gear motor including the motor and the reducer. [Background technology]

[0002] Conventionally, in motors, reducers, etc., a configuration is known in which liquid packing is applied between parts to prevent leakage of grease sealed in bearings that support the motor shaft. Patent Document 1 describes a configuration in which liquid packing is secured in a groove to prevent leakage of oil that lubricates a thrust bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication number 03-048419 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned conventional configuration of using liquid packing to prevent grease leakage is incomplete in its effectiveness in preventing grease leakage, and there is a problem in that the effectiveness of preventing grease leakage varies depending on the technician who applies the liquid packing.

[0005] Therefore, an object of the present invention is to provide a motor, a reducer, and a gear motor that can prevent grease from leaking from bearings without requiring work such as applying liquid gasket. [Means for solving the problem]

[0006] In order to achieve the above object, the invention described in claim 1 is characterized in that a bearing that supports the motor shaft and a cylindrical boss portion that holds the bearing are provided within the motor housing, the boss portion is provided with an extension portion that protrudes beyond the bearing, and the inner surface of the extension portion is provided with a grease receiving portion that receives grease. The invention as set forth in claim 2 is characterized in that in the invention as set forth in claim 1, the grease receiving portion is an annular recess that is recessed along the entire circumference of the inner diameter side of the extension portion. The invention as set forth in claim 3 is characterized in that in the invention as set forth in claim 2, the recess has a rectangular cross section.

[0007] The invention described in claim 4 is characterized in that a cylindrical boss portion is provided within the reducer housing to hold a bearing that supports an external motor shaft, the boss portion is provided with an extension portion that protrudes beyond the bearing, and the inner surface of the extension portion is provided with a grease receiving portion that receives grease. The invention as set forth in claim 5 is characterized in that in the invention as set forth in claim 4, the grease receiving portion is an annular recess that is recessed over the entire circumference of the inner diameter side of the extension portion. The invention as set forth in claim 6 is characterized in that in the invention as set forth in claim 5, the recess has a rectangular cross section.

[0008] The invention described in claim 7 is a gear motor consisting of a motor and a reducer, wherein a motor side bearing supporting the end of the motor shaft remote from the reducer, a reducer side bearing supporting the end of the motor shaft close to the reducer, and a cylindrical motor side boss portion for holding the motor side bearing are provided within the motor housing of the motor, and a cylindrical reducer side boss portion for holding the reducer side bearing is provided within the reducer housing of the reducer to which the motor housing is connected, and the motor side boss portion is provided with a motor side extension portion that protrudes beyond the motor side bearing, and the reducer side boss portion is provided with a reducer side extension portion that protrudes beyond the reducer side bearing, and grease receiving portions for receiving grease are provided on the inner surfaces of each of the motor side extension portion and the reducer side extension portion. Furthermore, the invention described in claim 8 is characterized in that, in the invention described in claim 7, each grease receiving portion is an annular recess that is recessed around the entire inner diameter side of the reducer side extension portion or the motor side extension portion. The invention as set forth in claim 9 is characterized in that in the invention as set forth in claim 8, the recess has a rectangular cross section. [Effects of the Invention]

[0009] According to the present invention, the motor and the reducer are provided with a boss portion that holds a bearing that supports the motor shaft, and an extension portion that extends from the boss portion beyond the bearing, and a grease receiving portion that receives grease is provided on the extension portion.

[0010] Therefore, the grease receiving portion can prevent leakage of the grease sealed in the bearing without applying liquid packing between the parts, etc. Furthermore, because the grease receiving portion is provided on an extension portion that extends from the boss portion provided on the motor and the reducer, it can be provided on the motor and the reducer without interfering with each other's structures. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing a gear motor according to the present invention. [Figure 2] 1 is a cross-sectional view showing a motor according to the present invention. [Figure 3] 1 is a cross-sectional view showing a reducer according to the present invention. [Figure 4] FIG. 2 is an enlarged view of part A in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an example of a motor, a reducer, and a gear motor including the motor and the reducer according to an embodiment of the present invention will be described with reference to the drawings.

[0013] Fig. 1 is a cross-sectional view showing the entire gear motor 1 of the present invention. Fig. 2 is a cross-sectional view showing a motor 2 of the present invention. Fig. 3 is a cross-sectional view showing a reducer 3 of the present invention. Fig. 4 is an enlarged view of part A in Fig. 1.

[0014] The gear motor 1 is composed of a motor 2 and a reducer 3 connected together. The motor 2 is composed of a hollow motor housing 11, which contains a stator 12 such as a stator, a rotor 13 such as a rotor rotatably supported by the stator 12, a motor shaft 14 held by the rotor 13 and rotating together with the rotor 13, and a motor-side bearing 15 and a reducer-side bearing 16 that support the motor shaft 14. In the motor 2, a fan section 17 having a fan main body 17a and a fan cover 17b is connected to the right end of the motor housing 11. The motor-side bearing 15 is located between the motor 2 and the fan section 17. The reducer-side bearing 16 is located between the motor 2 and the reducer 3. The motor-side bearing 15 and the reducer-side bearing 16 are each filled with grease.

[0015] The motor housing 11 is provided with a cylindrical motor side boss 18 that holds the motor side bearing 15. The motor side boss 18 is provided with a motor side extension 19 that protrudes to the left beyond the motor side bearing 15. The motor side extension 19 has dimensions and a shape that are determined so as not to affect the operation of the motor 2. The motor side extension 19 is also provided with a grease receiver 20 that receives grease sealed in the motor side bearing 15 to prevent it from leaking into the motor housing 11.

[0016] The reducer 3 is housed within a hollow reducer housing 21 that is connectable to the motor housing 11. The reducer 3 includes a gear portion 22 to which the left end of the motor shaft 14 is connected, an output shaft 22a that is connected to the gear portion 22 and outputs power from the gear portion 22 to the outside, and a cylindrical reducer side boss portion 23 that holds the reducer side bearing 16. The reducer side boss portion 23 is provided with a reducer side extension portion 24 that protrudes to the right beyond the reducer side bearing 16. The size and shape of the reducer side extension portion 24 are determined so as not to affect the operation of the motor 2. The reducer side extension portion 24 is also provided with a grease receiver 20 that receives grease sealed in the reducer side bearing 16 to prevent it from leaking out to the motor 2.

[0017] The structure of the grease receiving portion 20 will be described with reference to Fig. 4. Note that Fig. 4 is an enlarged view of the periphery of the grease receiving portion 20 provided on the motor-side extension portion 19 of the motor-side boss portion 18, but the grease receiving portion 20 provided on the reducer-side extension portion 24 of the reducer-side boss portion 23 also has the same structure and effect.

[0018] The grease receiving portion 20 is an annular recess that is recessed around the entire inner diameter side of the motor-side extension portion 19 and the reducer-side extension portion 24, and has a square cross section. If grease leaks from the motor-side bearing 15 and the reducer-side bearing 16 while the gear motor 1 is operating, the grease is collected in the grease receiving portion 20 of the motor-side extension portion 19 and the reducer-side extension portion 24, preventing the grease from leaking into the motor 2. The dimensions and shape of the grease receiving portion 20 are determined so that grease will not leak even if the entire gear motor 2 is tilted to a certain angle.

[0019] The dimensions of grease receiving portion 20 are determined appropriately depending on the amount of grease sealed in motor-side bearing 15 and reducer-side bearing 16. Specifically, when the amount of grease sealed in each bearing is less than 1.2 g, the dimensions of grease receiving portion 20 are preferably a depth H of 3 mm and a width L of 3 mm. When the amount of grease sealed in each bearing is 1.2 g or more but less than 4.0 g, the dimensions are preferably a depth H of 3.5 mm to 4.5 mm and a width L of 4 mm to 7 mm.

[0020] According to the gear motor 1 of the embodiment described above, the motor 2 is provided with a motor side boss portion 18 that holds the motor side bearing 15, and a motor side extension portion 19 that extends from the motor side boss portion 18 and protrudes beyond the motor side bearing 15. The reducer 3 is provided with a reducer side boss portion 23 that holds the reducer side bearing 16, and a reducer side extension portion 24 that extends from the reducer side boss portion 23 and protrudes beyond the reducer side bearing 16. The motor side extension portion 19 and the reducer side extension portion 24 are provided with grease receiving portions 20 that receive grease.

[0021] Therefore, it is possible to prevent leakage of grease sealed in the motor-side bearing 15 and the reducer-side bearing 16 by using the grease receiving portion 20, without applying liquid packing or the like between the parts. Furthermore, since the grease receiving portion 20 is configured to be provided on the motor-side extension portion 19 and the reducer-side extension portion 24, which are extended from the motor-side boss portion 18 and the reducer-side boss portion 23 provided on the motor 2 and the reducer 3, respectively, it can be provided on the motor 2 and the reducer 3 without interfering with each other's structures.

[0022] The motor, reducer, and gear motor using the reducer and motor according to the present invention are not limited to the above-described embodiments, and various configurations, as well as the overall configuration of the motor, reducer, and gear motor using the reducer and motor, can be modified as needed.

[0023] For example, in this embodiment, the motor housing 11 and the reducer housing 21 have respective components such as the motor side boss portion 18 and the reducer side boss portion 23 as separate parts, but they may be formed integrally. [Explanation of symbols]

[0024] 1 Gear motor, 2 Motor, 3 Reducer, 11 Motor housing, 12 Stator, 13 Rotor, 14 Motor shaft, 15 Motor side bearing, 16 Reducer side bearing, 17 Fan section, 17a Fan main body, 17b Fan cover, 18 Motor side boss section, 19 Motor side extension section, 20 Grease receiving section, 21 Reducer housing, 22 Gear section, 22a Output shaft, 23 Reducer side boss section, 24 Reducer side extension section.

Claims

1. A bearing for supporting the motor shaft and a cylindrical boss portion for holding the bearing are provided within the motor housing, The boss portion is provided with an extension portion that protrudes beyond the bearing, The motor is characterized in that a grease receiving portion for receiving grease is provided on the inner surface of the extension portion.

2. 2. The motor according to claim 1, wherein the grease receiving portion is an annular recess that is recessed along the entire inner diameter side of the extension portion.

3. 3. The motor according to claim 2, wherein the recess has a rectangular cross section.

4. A cylindrical boss portion is provided in the reducer housing to hold a bearing that supports the external motor shaft, The boss portion is provided with an extension portion that protrudes beyond the bearing, The reducer is characterized in that a grease receiving portion for receiving grease is provided on the inner surface of the extension portion.

5. 5. The reducer according to claim 4, wherein the grease receiving portion is an annular recess that is recessed around the entire inner diameter side of the extension portion.

6. The reducer according to claim 5, wherein the recess has a rectangular cross section.

7. A gear motor consisting of a motor and a reducer, a motor-side bearing for supporting an end of the motor shaft remote from the reducer, a reducer-side bearing for supporting an end of the motor shaft close to the reducer, and a cylindrical motor-side boss portion for holding the motor-side bearing are provided within a motor housing of the motor; a cylindrical reducer-side boss portion for holding the reducer-side bearing is provided in a reducer housing of the reducer to which the motor housing is coupled, the motor-side boss portion is provided with a motor-side extension portion that protrudes beyond the motor-side bearing, the reducer-side boss portion is provided with a reducer-side extension portion that protrudes beyond the reducer-side bearing, A gear motor characterized in that a grease receiving portion for receiving grease is provided on the inner surface of each of the motor-side extension portion and the reducer-side extension portion.

8. 8. The gear motor according to claim 7, wherein each of the grease receiving portions is an annular recess recessed over the entire inner diameter side of the reducer-side extension portion or the motor-side extension portion.

9. 9. The gear motor according to claim 8, wherein the recess has a rectangular cross section.

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