KR102496799B1 - Coupling structure of motor and reducer - Google Patents

Abstract

A reduction gear coupling structure of a drive motor is disclosed. A drive motor coupling structure according to an exemplary embodiment of the present invention is a combination of a drive motor including a motor unit and a reducer including a reduction unit, and the drive motor is a front cover as a fixed end bearing installed on the front cover. It includes a bearing and a rear bearing as a free end bearing installed on the rear cover, the reducer includes a reducer case coupled to the front cover, and a support unit for supporting the outer ring of the front bearing may be provided in the front cover and the reducer case. there is.

Description

Reducer combination structure of drive motor {COUPLING STRUCTURE OF MOTOR AND REDUCER}

An embodiment of the present invention relates to an electric power drive vehicle, and more particularly, to a coupling structure between a drive motor and a reducer applied to an electric vehicle.

Recently, pure electric power eco-friendly vehicles such as electric vehicles or fuel cell vehicles are attracting attention. An electric motor (hereinafter, referred to as a drive motor) is mounted in such an electric-powered eco-friendly vehicle as a driving source for obtaining rotational force with electric energy instead of an internal combustion engine such as an existing engine.

A drive motor used as a power source of an eco-friendly vehicle includes a motor housing, a stator fixedly installed inside the motor housing, and a rotor disposed with a predetermined air gap from the stator and rotating around a rotating shaft as a drive shaft. Both ends of the rotor shaft are rotatably supported by bearings on both sides of the motor housing (front cover and rear cover).

In bearings typically used in drive motors of eco-friendly vehicles, bearings installed on the front cover side are composed of fixed end bearings, and bearings installed on the rear cover side are composed of free end bearings. This bearing has an inner ring fixed to the rotating shaft and an outer ring fitted to the cover side of both sides of the motor housing.

Here, the fixed end bearing has a bearing cover for fixing the outer ring to the front cover. The bearing cover is for blocking the degree of freedom of the fixed end bearing in the axial direction, supports the outer ring of the fixed end bearing, and is fastened to the front cover through bolts. And, the free end bearing has a characteristic of absorbing assembly tolerances by free movement in the axial direction, and the outer ring is installed in a loose fit to the rear cover.

Meanwhile, a reducer for reducing the rotational speed of the rotational shaft and amplifying rotational torque may be connected to the driving motor. This reducer has a reducer case, which is fastened to the front cover of the drive motor through the reducer case, and can be connected through the rotation shaft of the drive motor.

In the structure of coupling the driving motor and the reduction gear as described above, an O-ring for blocking the inflow of foreign substances such as moisture and dust into the motor housing is mounted between the front cover of the driving motor and the coupling part of the reduction gear case of the reduction gear.

In addition, the coupling portion of the front cover of the driving motor to which the reducer case is coupled and the O-ring is mounted protrudes toward the front side, and is coupled to the coupling portion of the reducer case in a male-female manner with the O-ring attached to the protruding portion.

By the way, in such a coupling structure of the drive motor and the reducer, a separate bearing cover for fixing the outer ring of the fixed end bearing is mounted on the front cover of the drive motor, and these coupling parts for solid coupling and sealing of the front cover and the reducer case. As the thickness of is increased, the weight and manufacturing cost of the drive motor/reducer coupling structure inevitably increase.

Matters described in this background art section are prepared to enhance understanding of the background of the invention, and may include matters that are not prior art already known to those skilled in the art to which this technique belongs.

Embodiments of the present invention are intended to provide a drive motor and reducer coupling structure that can remove parts such as a bearing cover by changing the shape of the front cover and the reducer case, and can implement the shape of the front cover and the reducer case compactly. .

A structure for coupling a drive motor to a speed reducer according to an embodiment of the present invention combines a drive motor including a motor unit and a speed reducer including a speed reducer unit, and the drive motor includes a front bearing as a fixed end bearing installed on a front cover and , A rear bearing as a free end bearing installed on the rear cover, the reducer including a reducer case coupled to the front cover, and a support unit supporting an outer ring of the front bearing in the front cover and the reducer case may be provided.

In addition, in the reduction gear coupling structure of the drive motor according to an embodiment of the present invention, a mounting hole for mounting the front bearing may be provided in a front cover of the drive motor.

In addition, in the reduction gear coupling structure of the driving motor according to the embodiment of the present invention, the support unit may be provided in the mounting hole.

In addition, in the reduction gear coupling structure of the driving motor according to an embodiment of the present invention, the front bearing supports one end of the rotation shaft of the motor unit, and the rear bearing supports the other end of the rotation shaft. can

In addition, in the reduction gear coupling structure of the drive motor according to an embodiment of the present invention, the reduction unit may include an output shaft coupled to one end of the rotation shaft.

In addition, in the reduction gear coupling structure of the driving motor according to an embodiment of the present invention, the reduction gear case may be provided with a coupling part for coupling one end of the rotation shaft and the output shaft.

In addition, in the reduction gear coupling structure of the drive motor according to an embodiment of the present invention, the support unit may be provided in the coupling part.

In addition, the drive motor and reducer coupling structure according to an embodiment of the present invention is a combination of a drive motor including a motor unit and a reducer including a reduction unit, and the drive motor is a front cover as a fixed end bearing installed on the front cover. It includes a bearing and a rear bearing as a free end bearing installed on the rear cover, and the reducer includes a reducer case coupled to the front cover, and the front cover is provided with a mounting hole for mounting the front bearing, A support end inserted into the mounting hole and supporting a front end of an outer ring of the front bearing may protrude from the reducer case.

In addition, in the reduction gear coupling structure of the drive motor according to the embodiment of the present invention, a support groove for supporting the outer ring surface and the rear end of the outer ring of the front bearing may be formed on an inner circumferential surface of the mounting hole.

In addition, in the reduction gear coupling structure of the drive motor according to an embodiment of the present invention, the support end may be formed to protrude in a cylindrical shape from the coupling portion of the reduction gear case.

In addition, in the gearbox coupling structure of the drive motor according to an embodiment of the present invention, the support end is press-fitted into the inner circumferential surface of the mounting hole, and may support the front end of the outer ring of the front bearing.

In addition, in the reduction gear coupling structure of the driving motor according to an embodiment of the present invention, an O-ring sealing between the support end and the inner circumferential surface of the mounting hole may be installed.

In addition, in the reduction gear coupling structure of the drive motor according to an embodiment of the present invention, the front surface of the front cover corresponding to the reduction gear case may be provided with a flat surface.

Embodiments of the present invention may support and fix the front bearing of the drive motor through the support unit provided in the front cover of the drive motor and the reducer case of the reducer when assembling the drive motor and the reducer.

Therefore, in the embodiment of the present invention, the bearing cover as in the prior art can be deleted, and unlike the prior art, the shape of the front cover and the reducer case can be implemented compactly, so the overall length of the drive motor can be reduced, and the drive motor It is possible to reduce the weight and manufacturing cost of the coupling structure of the reducer and the reducer.

In addition, effects that can be obtained or predicted due to the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects expected according to an embodiment of the present invention will be disclosed within the detailed description to be described later.

Since these drawings are for reference in explaining exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a view showing a structure of a gearbox coupled to a drive motor according to an embodiment of the present invention.
2 is a view showing a state before assembling a drive motor and a reducer in a drive motor and reducer coupling structure according to an embodiment of the present invention.
3 is a view showing a state after assembling a drive motor and a reducer in a drive motor and reducer coupling structure according to an embodiment of the present invention.
FIG. 4 is a view showing a support unit applied to a reduction gear coupling structure of a drive motor according to an embodiment of the present invention.
5 is a view showing a comparative example for explaining the effect of the reduction coupling structure of the drive motor according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown in the drawings, and the thickness is enlarged to clearly express various parts and regions.

And, in the following detailed description, the names of the components are divided into first, second, etc. to classify them based on the relationship in which the components are the same, and the order is not necessarily limited in the following description.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

In addition, terms such as "...unit", "...means", "...part", and "...member" described in the specification refer to a comprehensive unit that performs at least one function or operation. it means.

1 is a view showing a structure of a gearbox coupled to a drive motor according to an embodiment of the present invention.

Referring to FIG. 1 , a structure 100 coupling a drive motor to a reducer according to an embodiment of the present invention is a drive motor of a pure electric powered eco-friendly vehicle such as an electric vehicle or a fuel cell vehicle, or a hybrid eco-friendly vehicle using driving power and electric power of an engine. It can be applied to the driving motor 10 of the vehicle.

For example, the driving motor 10 applied to the embodiment of the present invention may include a Permanent Magnet Synchronous Motor (PMSM), and a Wound Rotor Synchronous Motor (WRSM) may also include

The driving motor 10 as described above includes a motor unit 13 installed inside the motor housing 11. The motor unit 13 includes a stator 15 fixedly installed inside the motor housing 11, and a rotor disposed with a predetermined air gap from the stator 15 and rotating around a rotating shaft 17 as a drive shaft. (19) is included.

Here, a front cover 12 for sealing the front side of the motor housing 11 is installed on the front side of the motor housing 11, and a rear cover 14 for sealing the rear side of the motor housing 11 is installed on the rear side of the motor housing 11. And in the rotor 19, one end of the rotating shaft 17 is rotatably supported by the front cover 12, and the other end of the rotating shaft 17 is rotatably supported by the rear cover 14 do.

Furthermore, one end of the rotating shaft 17 is rotatably coupled to the front cover 12 through the front bearing 21, and the other end of the rotating shaft 17 is rotatably coupled to the rear through the rear bearing 31. It is rotatably coupled to the cover 14.

The front bearing 21 supports one end of the rotary shaft 17 on the front cover 12 side, and the rear bearing 31 supports the other end of the rotary shaft 17 on the rear cover 14 side. do.

2 is a view showing a state before assembling a drive motor and a reducer in a drive motor and reducer coupling structure according to an embodiment of the present invention, and FIG. 3 is a drive motor in a drive motor and reducer coupling structure according to an embodiment of the present invention. It is a drawing showing the state after assembly of and the reducer.

1 to 3, the front cover 12 forms a mounting hole 16 for mounting the front bearing 21. Here, one end of the rotating shaft 17 rotatably coupled to the front bearing 21 partially protrudes from the outside of the front cover 12 toward the front.

The front bearing 21 includes an outer ring 23 coupled to the mounting hole 16 of the front cover 12, an inner ring 25 coupled to one end of the rotating shaft 17, an outer ring 23, and an inner ring. (25) includes a rolling member (27) disposed between.

The outer ring 23 is mounted in the mounting hole 16 of the front cover 12 with a loose fit. The inner ring 25 is disposed inside the outer ring 23 and is press-fitted to one end of the rotating shaft 17 by means of a sliding interference fit. Further, the rolling member 27 may include a plurality of balls rolling along a race between the inner ring 25 and the outer ring 23 through the inner ring 25 rotated by the rotation shaft 17 .

As shown in FIG. 1, the rear bearing 31 includes an outer ring 33 coupled to the rear cover 14, an inner ring 35 coupled to the other end of the rotating shaft 17, and an outer ring ( 33) and a rolling member 37 disposed between the inner ring 35.

The outer ring 33 is mounted on the rear cover 14 with a loose fit. The inner ring 35 is disposed inside the outer ring 33 and is press-fitted to the other end of the rotary shaft 17 by means of a sliding interference fit. And the rolling member 37 includes a plurality of balls that roll along the race between the inner ring 35 and the outer ring 33 through the inner ring 35 rotated by the rotating shaft 17.

Here, the outer ring 23 of the front bearing 21 as described above may be fixed to the front cover 12 through a separate fixing means. This fixing means is fixed to the front cover 12, supports the outer ring 23, and functions to block the degree of freedom of the outer ring 23 relative to the front cover 12 in the axial direction. As the outer ring 23 is fixed to the front cover 12 through such a fixing means, in the embodiment of the present invention, the front bearing 21 can be defined as a fixed end bearing. The specific configuration and assembly structure of these fixing means will be described in more detail later.

In addition, the rear bearing 31 as described above does not have a separate fixing means as in the structure of the front bearing 21, and as the outer ring 33 is loosely fitted to the rear cover 14, the rear An axial degree of freedom of the outer ring 33 relative to the cover 14 can be allowed. As described above, the rear bearing 31 absorbs assembly tolerances by freely moving in the axial direction as the outer ring 33 is not fixed through a separate fixing means and is loosely fitted to the rear cover 14. characteristics can be assigned. Accordingly, in an embodiment of the present invention, the rear bearing 31 may be defined as a free end bearing.

Reference numeral 41 not described in FIG. 1 denotes a resolver as a position sensor for detecting the rotational speed and absolute position of the rotor 19 . Since the configuration of the resolver 41 is a well-known technique in the art, a detailed description of the configuration will be omitted in this specification.

On the other hand, the reducer 50 coupled to the drive motor 10 as described above is configured to reduce the rotation speed transmitted from the rotation shaft 17 of the drive motor 10.

The reducer 50 includes a reducer case 51 and a reducer unit 53 installed in the reducer case 51. The reducer case 51 is coupled to the front cover 12 of the drive motor 10, and is fastened to the front cover 12 through a fastening means such as a bolt.

The reduction unit 53 is a configuration for substantially reducing the rotational speed transmitted from the rotational shaft 17 of the drive motor 10, and the output shaft 55 coupled to one end of the rotational shaft 17 in a spline manner And, it includes a reduction gear group 57 such as an intermediate gear, an output gear, and a parking gear connected to the output shaft 55. Since the configuration of the deceleration unit 53 is a well-known technology in the art, a detailed description of the configuration will be omitted in this specification.

Here, the reducer case 51 has a coupling part 52 for coupling one end of the rotation shaft 17 protruding from the outside of the front cover 12 of the drive motor 10 to the front side and the output shaft 55 is provided

The coupling part 52 is a part in which one end of the rotation shaft 17 and the coupling end of the output shaft 55 to be coupled are coupled, and the coupling end of the output shaft 55 in the coupling portion 52 is the drive motor 10 ) is partially protruded toward the front cover 12 side.

In the embodiment of the present invention, the configuration of the drive motor 10 and the reducer 50 as described above is basic, and the bearing cover as in the prior art is changed by changing the shape of the front cover 12 and the reducer case 51. A reduction gear coupling structure 100 of a driving motor capable of removing parts such as the back and compactly implementing the shape of the front cover 12 and the reduction gear case 51 is provided.

To this end, the reduction gear coupling structure 100 of the driving motor according to an embodiment of the present invention includes a support unit 70 provided on the front cover 12 of the driving motor 10 and the reduction gear case 51 of the reduction gear 50 contains

FIG. 4 is a view showing a support unit applied to a reduction gear coupling structure of a drive motor according to an embodiment of the present invention.

Referring to FIG. 4 together with FIGS. 1 to 3, in the embodiment of the present invention, the support unit 70 is a fixing means for fixing the front bearing 21 of the drive motor 10 to the front cover 12. , It supports the outer ring 23 of the front bearing 21 and functions to block the degree of freedom of the front bearing 21 relative to the front cover 12 in the axial direction.

In the embodiment of the present invention, the support unit 70 is provided in the mounting hole 16 of the front cover 12 in the drive motor 10, and the coupling part 52 of the reducer case 51 in the reducer 50 ) is provided.

The support unit 70 includes a support groove 71 formed on the inner circumferential surface of the mounting hole 16 in the front cover 12 and a support end formed in the coupling part 52 in the reducer case 51 ( 73).

The support groove 71 is a groove supporting the outer ring 23 of the front bearing 21, and is formed along the inner circumferential surface of the mounting hole 16, which supports the outer ring surface of the outer ring 23. It consists of a first part 72a and a second part 72b supporting the rear end (rear edge end) of the outer ring 23.

The support groove 71 supports the outer ring surface of the outer ring 23 of the front bearing 21 and the rear end of the outer ring 23, so that the front bearing 21 moves from the mounting hole 16 side to the rear side. can prevent becoming

In addition, the support end 73 is formed to protrude integrally from the coupling part 52 in the reducer case 51, and is formed to protrude toward the rear side toward the front cover 12 of the drive motor 10.

The support end 73 has a thickness corresponding to the thickness of the outer ring 23 of the front bearing 21, and one end of the rotation shaft 17 of the drive motor 10 and the output shaft 55 of the reducer 50 are mutually coupled. ) is provided in a cylindrical shape so as to surround the coupling end of the When assembling the front cover 12 and the reducer case 51, the support end 73 is inserted into the inner circumferential surface of the mounting hole 16 of the front cover 12, and the outer ring 23 of the front bearing 21 ) to support the front end of the

Here, the support end 73 is press-fitted into the inner circumferential surface of the mounting hole 16, and prevents the front bearing 21 from being separated from the mounting hole 16 side to the front side while supporting the front end of the outer ring 23. can do.

Furthermore, an O-ring 81 is installed on the inner circumferential surface of the mounting hole 16 to seal between it and the support end 73, and the O-ring 81 connects the support end 73 to the mounting hole 16 It is compressed when pressed into the inner circumferential surface of and seals between the support end 73 and the inner circumferential surface of the mounting hole 16.

On the other hand, in the embodiment of the present invention, the front cover 12 of the drive motor 10 as described above is coupled to the reducer case 51 of the reducer 50 and to support and fix the front bearing 21, the reducer A front surface corresponding to the case 51 is provided with a flat surface 18 .

Hereinafter, the assembling process and operation of the drive motor gearbox coupling structure 100 according to the embodiment of the present invention configured as described above will be described in detail with reference to the previously disclosed drawings.

First, in the embodiment of the present invention, the drive motor 10 and the reducer 50 to be mutually coupled are provided. In the drive motor 10, the front bearing 21 is mounted in the mounting hole 16 of the front cover 12 and supports one end of the rotating shaft 17. And, the O-ring 81 is installed on the inner circumferential surface of the mounting hole 16.

At this time, one end of the rotating shaft 17 is in a state of partially protruding from the outside of the front cover 12 toward the front, and the outer ring 23 of the front bearing 21 is mounted on its outer ring surface and rear end It is in a state supported by the support groove 71 of the support unit 70 on the inner circumferential surface of the hole 16.

That is, the support groove 71 supports the outer race surface and the rear end of the outer race 23 of the front bearing 21, and prevents the front bearing 21 from being separated from the mounting hole 16 toward the rear side.

Further, in the driving motor 10, the rear bearing 31 is mounted on the rear cover 14 and supports the other end of the rotation shaft 17 on the resolver 41 side.

Meanwhile, the output shaft 55 of the reducer 50 partially protrudes toward the front cover 12 side (rear side) of the drive motor 10 through the coupling part 52 of the reducer case 51.

In this state, in the embodiment of the present invention, the front cover 12 of the drive motor 10 and the reducer case 51 of the reducer 50 are mutually assembled, and the rotation protrudes from the outside of the front cover 12 to the front side. One end of the shaft 17 and the coupling end of the output shaft 55 protruding from the outside of the reducer case 51 toward the rear are coupled. At this time, one end of the rotary shaft 17 and the coupling end of the output shaft 55 are coupled in a spline manner on the side of the coupling part 52 of the reducer case 51.

In this process, in the embodiment of the present invention, the support end 73 of the reducer case 51 as the support unit 70 is press-fitted and inserted into the inner circumferential surface of the mounting hole 16 of the front cover 12.

Then, in the embodiment of the present invention, while the O-ring 81 is compressed by the support end 73 and seals between the support end 73 and the inner circumferential surface of the mounting hole 16, the support end 73 The front end of the outer ring 23 of the front bearing 21 is supported/fixed, and the front bearing 21 is prevented from being separated from the mounting hole 16 toward the front side.

Therefore, in the embodiment of the present invention, the front cover 12 of the drive motor 10 and the reducer case 51 of the reducer 50 are coupled through the assembly process as described above, and at the same time, the drive motor 10 The drive motor 10 and the reducer ( 50) can be integrally combined.

According to the structure 100 for coupling the drive motor to the reducer according to the embodiment of the present invention as described above, when assembling the drive motor 10 and the reducer 50, the front cover 12 of the drive motor 10 and The front bearing 21 of the drive motor 10 may be supported and fixed through the support unit 70 provided in the reducer case 51 of the reducer 50 .

Thus, in the embodiment of the present invention, as in the comparative example of the prior art shown in FIG. 5, it is possible to delete the bearing cover 5 fastened to the front cover 3 to fix the front bearing 1 of the driving motor. there is.

In addition, in the embodiment of the present invention, unlike in the comparative example, the front cover 3 of the drive motor and the reducer case 7 of the reducer are increased in thickness for coupling and sealing, unlike the front cover ( 12) and the shape of the reducer case 51 can be implemented compactly.

Therefore, in the embodiment of the present invention, since the expensive bearing cover 5 can be removed and the front cover 12 and the reducer case 51 can be implemented compactly, the overall length of the drive motor 10 can be reduced, , It is possible to reduce the weight and manufacturing cost of the coupling structure of the driving motor 10 and the reduction gear 50.

Although the embodiments of the present invention have been described above, the technical spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the technical spirit of the present invention may, within the scope of the same technical spirit, the components Other embodiments can be easily proposed by adding, changing, deleting, adding, etc., but it will also be said to fall within the scope of the present invention.

10: drive motor 11: motor housing
12: front cover 13: motor unit
14: rear cover 15: stator
16: mounting hole 17: rotating shaft
18: plane 19: rotor
21: front bearing 23, 33: outer ring
25, 35: inner ring 27, 37: rolling member
31: rear bearing 41: resolver
50: reducer 51: reducer case
52: coupling part 53: reduction unit
55: output shaft 57: reduction gear group
70: support unit 71: support groove
72a: first part 72b: second part
73: support end 81: O-ring

Claims (9)

delete delete delete A speed reducer coupling structure of a drive motor combining a drive motor including a motor unit and a speed reducer including a speed reduction unit,
The drive motor includes a front bearing as a fixed end bearing installed on the front cover and a rear bearing as a free end bearing installed on the rear cover,
The reducer includes a reducer case coupled to the front cover,
The front cover is provided with a mounting hole for mounting the front bearing,
In the reducer case, a support end fitted into the mounting hole and supporting the front end of the outer ring of the front bearing is formed to protrude,
The support end has a thickness corresponding to the thickness of the outer ring of the front bearing, is press-fitted into the inner circumferential surface of the mounting hole, and supports the front end of the outer ring, but the O-ring seals between the inner circumferential surface of the mounting hole and the support end. Reducer coupling structure of the drive motor to be installed. According to claim 4,
A reduction gear coupling structure of a drive motor in which a support groove is formed on an inner circumferential surface of the mounting hole to support the outer ring surface and the rear end of the outer ring of the front bearing. According to claim 4,
The front bearing supports one end of the rotating shaft of the motor unit, and the rear bearing supports the other end of the rotating shaft,
The speed reduction unit includes an output shaft coupled to one end of the rotation shaft,
The reducer case is provided with a coupling part for coupling one end of the rotation shaft and the output shaft,
The reduction gear coupling structure of the driving motor in which the support end is formed to protrude in a cylindrical shape at the coupling part. delete delete According to claim 4,
A reduction gear coupling structure of a drive motor in which a front surface of the front cover corresponding to the reduction gear case is provided with a flat surface.

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