JP6921019B2 - Reducer with motor - Google Patents

Description

The present invention relates to a speed reducer with a motor.

Patent Document 1 discloses a speed reducer with a motor in which a motor and a speed reducer are connected via a flange. This speed reducer with a motor has a first oil seal (25) that seals between the large diameter portion of the output shaft of the motor and the end face of the flange, and the large diameter portion of the output shaft of the motor and the through hole portion of the flange. It has a second oil seal (26) to be sealed. With such a seal structure, it is possible to prevent the lubricating oil in the speed reducer from entering the inside of the motor along the output shaft of the motor.

JP-A-2017-120126

However, in the structure in which the oil seal is doubly arranged on the large diameter portion of the output shaft of the motor, in the assembly process of connecting the motor and the speed reducer, the step of passing the output shaft of the motor through the oil seal fixed to the connecting portion. Occurs. In this process, it is difficult to accurately align the center of the output shaft of the motor with the center of the oil seal, and there is a problem that the oil seal is easily damaged by passing the output shaft while the center is off.

An object of the present invention is to provide a speed reducer with a motor that can suppress damage to the oil seal in the assembly process of connecting the motor and the speed reducer while ensuring high sealing performance between the motor and the speed reducer. ..

The speed reducer with a motor according to the present invention
A speed reducer with a motor including a motor having a motor output shaft and a load side cover, a speed reducer arranged on the load side of the motor, and a flange arranged between the motor and the speed reducer. hand,
The motor output shaft has a small diameter portion provided with a pinion that meshes with the first gear of the speed reducer, and a large diameter portion provided on the motor side of the small diameter portion.
A first oil seal arranged between the load side cover and the motor output shaft,
A second oil seal arranged between the flange and the large diameter portion of the motor output shaft is further provided.
The load side cover and the flange have an in-row fitting portion for in-row fitting.
The axial length L1 of the in-row fitting portion is larger than the axial distance L2 from the end of the large diameter portion on the speed reducer side to the lip portion of the second oil seal.
It was configured.

According to the present invention, it is possible to suppress damage to the oil seal in the assembly process of connecting the motor and the speed reducer while ensuring high sealing performance between the motor and the speed reducer.

It is a side view of the partial break which shows the speed reducer with a motor which concerns on embodiment of this invention. It is an enlarged view which shows the connection part of a motor and a speed reducer. It is a side view of a partial break which shows the state in the process of connecting a motor and a speed reducer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially broken side view showing a speed reducer with a motor according to an embodiment of the present invention. In the present specification, the direction along the central axis O1 of FIG. 1 is defined as the axial direction, the direction orthogonal to the central axis O1 is defined as the radial direction, and the direction of rotation about the central axis O1 is defined as the circumferential direction.

The speed reducer 1 with a motor according to the embodiment of the present invention includes a motor 10, a speed reducer 30, and a flange 20 arranged between the motor 10 and the speed reducer 30 to connect them.

The motor 10 has a stator and a rotor, a motor output shaft 12 that is integrally driven by the rotor, a housing 14 that houses the stator and the rotor, and an opening on the load side (reducer 30 side) of the housing 14. A load-side cover 16 for covering is provided. The motor output shaft 12 has a small diameter portion 12a provided with a pinion g1 and a large diameter portion 12b. The large diameter portion 12b has a larger diameter than the small diameter portion 12a and is located closer to the motor 10 than the small diameter portion 12a. The load side cover 16 has a through hole 16a through which the large diameter portion 12b of the motor output shaft 12 passes, and a first oil seal is provided between the inner peripheral surface of the through hole 16a and the large diameter portion 12b of the motor output shaft 12. o1 is provided. The first oil seal o1 seals between the through hole 16a of the load side cover 16 and the motor output shaft 12, and the lubricant passes through the through hole 16a of the load side cover 16 along the outer peripheral surface of the motor output shaft 12. Suppress doing.

The speed reducer 30 includes a gear mechanism 31 that decelerates the input rotary motion, a casing 32 that covers the radial outer side of the gear mechanism 31, and an output shaft 34 that outputs the decelerated rotary motion. The gear mechanism 31 includes a first gear g2 that meshes with the pinion g1 of the motor 10. Although not particularly limited, the gear mechanism 31 in FIG. 1 is a so-called distribution type eccentric swing type deceleration mechanism. The first gear g2 corresponds to a transmission gear provided on the eccentric planetary shaft. The casing 32 is open on the motor 10 side, and a plurality of connected portions (not shown) that can be connected to the flange 20 by bolts or the like are provided on the end surface on the motor 10 side.

The flange 20 has a shape in which the cross sections of FIG. 1 are connected in an annular shape, and the motor 10 of the speed reducer 30 except for the through hole 22 through which the large diameter portion 12b of the motor output shaft 12 passes and the portion of the motor output shaft 12. It has a cover portion 21 that covers the side. Further, a plurality of connected portions (not shown) that are connected to the casing 32 of the speed reducer 30 by bolts or the like are provided on the outer peripheral portion of the flange 20.

The load-side cover 16 of the motor 10 and the motor 10 side of the flange 20 are provided with an in-row fitting portion C1 that is in-row-fitted to each other. The in-row fitting portion C1 means a portion where the fitting hole 23f provided in the flange 20 and the protrusion 16m provided in the load side cover 16 are fitted. The outer peripheral surface of the protrusion 16m and the inner peripheral surface of the fitting hole 23f have a shape in which the cross-sectional shapes perpendicular to the central axis O1 are continuous in the axial direction. As a result, after adjusting the position where the tip of the protrusion 16m and the open end of the fitting hole 23f are fitted, the load side cover 16 and the flange 20 are brought into contact with each other by moving them in parallel in the axial direction. Both can be fitted. The load-side cover 16 and the flange 20 of the motor 10 may be connected to each other by bolts or the like at positions where the in-row fitting portion C1 is fully fitted.

A second oil seal o2 is provided between the through hole 22 of the flange 20 and the large diameter portion 12b of the motor output shaft 12. The second oil seal o2 seals between the through hole 22 of the flange 20 and the motor output shaft 12, and prevents the lubricant from passing through the through hole 22 along the outer peripheral surface of the motor output shaft 12.

<Dimensions of main parts>
Subsequently, the dimensions of the main part at the connecting portion between the motor 10 and the speed reducer 30 will be described. FIG. 2 is an enlarged view showing a connecting portion between the motor and the speed reducer. Here, the dimensions of the motor 10, the flange 20, and the speed reducer 30 are shown in a state of being connected to each other.

As shown in FIG. 2, the axial length L1 of the in-row fitting portion C1 extends from the end of the large-diameter portion 12b of the motor output shaft 12 on the reducer 30 side to the main lip R1 of the second oil seal o2. It is longer than the axial distance L2. Further, the length L1 is longer than the axial distance L2a from the end of the large diameter portion 12b of the motor output shaft 12 on the speed reducer 30 side to the dust strip R2 of the second oil seal o2. The main lip R1 and the dust strip R2 correspond to an example of the lip portion according to the present invention. The dust strip R2 corresponds to an example of "the lip portion of the second oil seal lip portion closest to the in-row fitting portion" according to the present invention.

Further, the axial length L1 of the in-row fitting portion C1 is longer than the axial distance L3 from the end of the pinion g1 on the reducer 30 side to the end of the first gear g2 on the motor 10 side.

In the present embodiment, the end portion of the pinion g1 coincides with the end portion of the motor output shaft 12, but the end portion of the pinion g1 is not limited to this, and the end portion of the pinion g1 is a motor rather than the end portion of the motor output shaft 12. It may be located on the 10 side.

<Assembly process>
FIG. 3 is a side view of a partially broken portion showing a state in which the motor and the speed reducer are in the process of being connected.

The step of assembling the speed reducer 1 with a motor includes a connecting step of connecting the speed reducer 30 to which the flange 20 is fixed and the motor 10. In this connecting step, the worker attaches the second oil seal o2 to the through hole 22 of the flange 20 in advance. In the connecting step, first, as a first step, the worker aligns the tip of the protrusion 16m of the load side cover 16 of the motor 10 with the open end of the fitting hole 23f of the flange 20 and slightly inlays them. Fit. FIG. 3 shows the state of this first stage.

In the first stage of the connecting process, the motor 10 and the speed reducer 30 are aligned so that the center line of the motor output shaft 12 overlaps with the center line of the speed reducer 30 by slightly fitting the in-row fitting portion C1. The position of is decided. Further, in the first stage, due to the relationship between the length L1 and the distances L2 and L2a described above, the large diameter portion 12b of the motor output shaft 12 is the main lip R1 and the dust strip R2 of the second oil seal o2 (see FIG. 2). ) Is separated. Further, in the first stage, the pinion g1 of the motor output shaft 12 is separated from the first gear g2 of the speed reducer 30 due to the relationship between the length L1 and the distance L3 described above. That is, the flange 20 and the load side cover 16 are positioned at the in-row fitting portion C1 before the large diameter portion 12b comes into contact with the main lip R1 and the dust strip R2. Further, the flange 20 and the load side cover 16 are positioned at the in-row fitting portion C1 before the pinion g1 and the first gear g2 come into contact with each other.

Subsequently, as the second step of the connecting process, the worker moves the motor 10 in parallel with the speed reducer 30 in the axial direction to fit the in-row fitting portion C1 to the final position. During this time, the positions of the motor 10 and the speed reducer 30 are aligned so that the center line of the motor output shaft 12 overlaps the center line of the speed reducer 30. Therefore, the large-diameter portion 12b of the motor output shaft 12 is in contact with the dust strip R2 and the main lip R1 (see FIG. 2) of the second oil seal o2 without applying a large force locally to them. , Pass through the through hole in the center of the second oil seal o2. The second oil seal o2 is arranged between the through hole 22 of the flange 20 and the large diameter portion 12b of the motor output shaft 12.

Further, in the second stage of the connecting process, since the positions of the motor 10 and the speed reducer 30 are aligned, the pinion g1 of the motor output shaft 12 and the first gear g2 of the speed reducer 30 are easily meshed with each other. In arrangement. Therefore, at the beginning of the second stage, the worker advances the fitting of the in-row fitting portion C1 while adjusting the rotational position of the motor output shaft 12 so that the pinion g1 and the first gear g2 mesh with each other. When the rotational positions of the motor output shaft 12 are aligned, the end of the pinion g1 on the speed reducer 30 side and the end of the first gear g2 on the motor 10 side mesh with each other. After that, since the center positions of the motor 10 and the speed reducer 30 are aligned, the worker can easily push the pinion g1 to a position where the pinion g1 and the first gear g2 overlap in the radial direction. can.

When the in-row fitting portion C1 is fully fitted, as shown in FIG. 1, the large diameter portion 12b of the motor output shaft 12 is fitted into the second oil seal o2, and the first gear g2 is pinioned over the entire tooth width. It is in a state of being meshed with g1.

After fitting the in-row fitting portion C1 to the end, the worker connects the load side cover 16 of the motor 10 and the flange 20 with bolts or the like. As a result, the motor 10, the flange 20, and the speed reducer 30 are connected, and the assembly of the speed reducer 1 with a motor is completed.

As described above, according to the speed reducer 1 with a motor of the embodiment, the first oil seal o1 seals between the load side cover 16 of the motor 10 and the motor output shaft 12, and the flange 20 and the motor output shaft 12 The second oil seal o2 seals between them. As a result, high sealing performance between the motor 10 and the speed reducer 30 can be ensured. Further, according to the present embodiment, the load side cover 16 and the flange 20 have an in-row fitting portion C1, and the length L1 of the in-row fitting portion C1 is the third from the end of the large-diameter portion 12b of the motor output shaft 12. 2 The distance L2 in the axial direction of the oil seal o2 to the main lip R1 is longer. Therefore, when assembling the speed reducer 1 with a motor, after the in-row fitting portion C1 starts to fit, the large diameter portion 12b of the motor output shaft 12 is in the middle of fitting, and the main lip R1 of the second oil seal o2 It approaches the part of. At this time, since the positions of the central shaft of the motor output shaft 12 and the central shaft of the speed reducer 30 are aligned by fitting the in-row fitting portion C1, the large diameter portion 12b of the motor output shaft 12 is locally located. It does not hit the main lip R1 of the second oil seal o2 strongly. As a result, the motor output shaft 12 can be passed through the second oil seal o2 without damaging the second oil seal o2.

Further, according to the speed reducer 1 with a motor of the embodiment, the length L1 of the in-row fitting portion C1 is in the axial direction from the end of the large diameter portion 12b of the motor output shaft 12 to the dust strip R2 of the second oil seal o2. Is longer than the distance L2a in. Therefore, in the assembly process, the large diameter portion 12b of the motor output shaft 12 is in a state where the positions of the central shaft of the motor output shaft 12 and the central shaft of the speed reducer 30 are aligned by fitting the in-row fitting portion C1. It approaches the portion of the dust strip R2 of the second oil seal o2. Therefore, the motor output shaft 12 can be passed through the second oil seal o2 without damaging the portion of the dust strip R2 of the second oil seal o2.

Further, according to the motor-equipped speed reducer 1 of the embodiment, the length L1 of the in-row fitting portion C1 is in the axial direction from the end of the pinion g1 on the speed reducer 30 side to the end of the first gear g2 on the motor 10 side. Greater than the distance L3. Therefore, in the assembly process, one end of the pinion g1 in the axial direction and the first pinion g1 are aligned with each other by fitting the in-row fitting portion C1 so that the central axis of the motor output shaft 12 and the central axis of the speed reducer 30 are aligned. One end of the gear g2 in the axial direction comes into contact with it. As a result, the motor 10 and the speed reducer 30 can be smoothly assembled in a state where the pinion g1 and the first gear g2 are meshed with each other.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, the small diameter portion 12a, the large diameter portion 12b, and the rotor arrangement portion of the motor output shaft 12 are integrally provided on a single member, but the present invention is not limited to this, and the small diameter portion and the large diameter portion are provided. A part or all of the part and the rotor arrangement part may be separated and connected to form a motor output shaft. Further, in the above embodiment, the in-row fitting portion C1 shows a mode in which the inner circumference of the flange 20 and the outer circumference of the load side cover 16 are fitted, but the present invention is not limited to this, and the in-row fitting portion is the outer circumference of the flange. And the inner circumference of the load side cover may be fitted with each other. Further, in the above embodiment, an example in which a medium diameter portion and a tapered portion are provided between the small diameter portion 12a and the large diameter portion 12b of the motor output shaft 12 is shown, but one of the medium diameter portion and the tapered portion is shown. Or both may be absent.

Further, in the above embodiment, the length L1 of the in-row fitting portion C1 extends from the end of the large diameter portion 12b of the motor output shaft 12 to all the lip portions (main lip R1, dust strip R2) of the second oil seal o2. The configuration is longer than the distances L2 and L2a. However, the length L1 of the in-row fitting portion C1 may be longer than the distance to any lip portion, for example, longer than the distance L2 to the main lip R1 and shorter than the distance L2a to the dust strip R2. Even in this case, it is possible to obtain the effect that the motor output shaft 12 can be passed through the second oil seal o2 while suppressing damage to any of the lip portions such as the main lip R1. Further, in the above embodiment, the distribution type eccentric swing type reduction mechanism is shown as the gear mechanism of the reduction gear, but the type of the reduction mechanism is not particularly limited, and for example, a simple planetary gear mechanism or a parallel axis reduction mechanism is applied. May be done. In addition, the details shown in the embodiment, such as the shape of the flange, the connecting structure between the flange and the motor, and the connecting structure between the flange and the speed reducer, can be appropriately changed without departing from the spirit of the invention.

1 Reducer with motor 10 Motor 12 Motor output shaft 12a Small diameter part 12b Large diameter part g1 Pinion 16 Load side cover 16m Protrusion 20 Flange 21 Cover part 22 Through hole 23f Fitting hole 30 Reducer 31 Gear mechanism g2 1st gear 32 Casing 34 Output shaft C1 Inlay fitting part o1 1st oil seal o2 2nd oil seal

Claims (3)

A speed reducer with a motor including a motor having a motor output shaft and a load side cover, a speed reducer arranged on the load side of the motor, and a flange arranged between the motor and the speed reducer. hand,
The motor output shaft has a small diameter portion provided with a pinion that meshes with the first gear of the speed reducer, and a large diameter portion provided on the motor side of the small diameter portion.
A first oil seal arranged between the load side cover and the motor output shaft,
A second oil seal arranged between the flange and the large diameter portion of the motor output shaft is further provided.
The load side cover and the flange have an in-row fitting portion for in-row fitting.
The axial length L1 of the in-row fitting portion is larger than the axial distance L2 from the end of the large diameter portion on the speed reducer side to the lip portion of the second oil seal.
Reducer with motor. The distance L2 is the distance from the end of the large-diameter portion on the speed reducer side to the lip portion of the lip portion of the second oil seal that is closest to the in-row fitting portion.
The speed reducer with a motor according to claim 1. The length L1 is larger than the axial distance L3 from the end of the pinion on the speed reducer side to the end of the first gear on the motor side.
The speed reducer with a motor according to claim 1 or 2.

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