KR102434902B1 - In-wheel motor apparatus - Google Patents

Abstract

The present invention relates to a housing having a hole through which the shaft is formed, and fastened to the inside of the housing, a gearbox having a sun gear, a planetary gear and a ring gear, the shaft passes through an inner hole, and between the inner hole and the shaft An in-wheel motor device comprising a rotor to which a bearing is coupled, a magnet matching the inside of the rotor, and a stator disposed inside the magnet, according to the present invention, it is possible to mount a gearbox to the in-wheel motor device, and Phase shift can be prevented.

Description

In-Wheel Motor Device {IN-WHEEL MOTOR APPARATUS}

The present invention relates to an in-wheel motor that is mounted on a wheel and directly drives the wheel.

In general, an in-wheel motor is a driving motor mounted on a wheel of each wheel in an in-wheel driving system and individually supplies power to each wheel.

Compared to other cars, the in-wheel drive system has a simple drive system compared to other cars, so it can get a lot of interior space as a small motor is individually mounted on each wheel instead of using a single large motor. It has the advantage of being able to omit a complicated power transmission device such as

Moreover, as the power transmission device can be omitted as described above, the in-wheel drive system can realize high efficiency and high performance of the vehicle.

That is, the in-wheel drive system can secure sufficient driving power by reducing power wastage by directly mounting the in-wheel motors on the wheels of each wheel. Therefore, it is possible to improve the fuel efficiency of the vehicle by maximizing the recovery of braking energy.

As a disadvantage of the structure of the conventional in-wheel motor, since the ring gear is held concentrically with the housing or the outer ring, the phase shift occurs when the ring gear is hot-pressed or assembled, which adversely affects noise. In addition, it is difficult to disassemble and assemble due to the nature of the in-wheel motor, which cannot use a gearbox, and there is a risk of performance degradation and failure when reassembling after disassembly.

Also, since it belongs to the motor unit and one housing, it is difficult to inject oil to reduce noise or heat, so grease is injected. may interfere with the

The matters described in the above background art are intended to help the understanding of the background of the invention, and may include matters that are not already known to those of ordinary skill in the art to which this technology belongs.

Korean Patent Publication No. 10-1757317

The present invention has been devised to solve the above problems, and an object of the present invention is to provide an in-wheel motor device that enables mounting of a gearbox on an in-wheel motor device and prevents a phase shift of a ring gear. .

The in-wheel motor device according to one aspect of the present invention includes a housing having a hole through which a shaft passes, a gearbox fastened to the inside of the housing, and a sun gear, a planetary gear and a ring gear, the shaft passes through the inner hole and a rotor in which a bearing is coupled between the inner hole and the shaft, a magnet matching the inside of the rotor, and a stator disposed inside the magnet.

And, it may further include a hub fixed to the shaft passing through the central hole, the stator is coupled to the outer peripheral surface.

Here, the gearbox includes a gearbox housing, a sun gear through which the shaft passes, a planetary gear meshed outside the sun gear, a ring gear meshed with the planetary gear, and a circular cross-sectional shape. , and a carrier coupled to the planetary gear by a gear pin passing through the formed hole.

The gearbox may further include a first bearing mounted between an outer circumferential surface of the carrier and an inner circumferential surface of the housing.

In addition, a ring gear insertion groove is formed around the inner surface of the gearbox housing, and the ring gear is inserted and fixed in the ring gear insertion groove.

The gearbox may further include a cover coupled to cover one surface of the gearbox housing and having a hole through which the shaft passes.

The gearbox may further include a second bearing in which one side body of the sun gear is inserted into the hole formed in the cover, and is mounted between the sun gear and the hole formed in the cover.

Furthermore, it may further include a third bearing mounted between the planetary gear and the gear pin.

Meanwhile, in the rotor, an outer hole having a larger diameter than the inner hole is formed to be stepped with the inner hole, and one side body of the sun gear is inserted into the outer hole of the rotor.

Next, in the in-wheel motor according to another aspect of the present invention, the shaft passes through the housing through which the hole is formed, the gearbox fastened to the inside of the housing, and the inner hole, the inner hole and the shaft a rotor having a bearing coupled therebetween, a magnet matching the inside of the rotor, and a stator disposed inside the magnet, wherein the gearbox includes a gearbox housing, a sun gear disposed in the gearbox housing, and through which the shaft passes; a planetary gear meshed outside the sun gear and a ring gear meshed with the planetary gear, a ring gear insertion groove is formed around an inner surface of the gearbox housing, and the ring gear is inserted into the ring gear insertion groove characterized in that it is fixed.

In addition, the gear box may further include a carrier having a circular cross-sectional shape and coupled to the planetary gear by a gear pin passing through the formed hole.

In addition, the gearbox may further include a first bearing mounted between the outer circumferential surface of the carrier and the inner circumferential surface of the housing.

Furthermore, the gearbox may further include a cover that is fastened to cover one surface of the gearbox housing and has a hole through which the shaft passes.

The gearbox may further include a second bearing in which one side body of the sun gear is inserted into the hole formed in the cover, and is mounted between the sun gear and the hole formed in the cover.

In addition, a third bearing mounted between the planetary gear and the gear pin may be further included.

According to the in-wheel motor device of the present invention, the ring gear, the planetary gear, and the sun gear are configured as one gearbox to be mounted on the housing of the in-wheel motor.

In addition, the concentricity of the ring gear is fixed by the bearing of the housing of the gearbox by a method of fixing the ring gear in the gearbox rather than the conventional method of fixing the ring gear by press-fitting it into the housing, and the housing and the cover of the gearbox are used. By fixing the top and bottom, it is possible to prevent phase difference due to shaking.

In addition, since the carrier holds concentricity due to the bearing mounted on the housing, the phase difference in meshing between the ring gear and the sun gear is reduced.

1 shows a cross-sectional shape of an in-wheel motor device according to the present invention.
Figure 2 is an exploded view of the gearbox according to the present invention.
3 is an exploded view of an in-wheel motor device according to the present invention.
4 is a view showing an operating state of the in-wheel motor device of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In describing preferred embodiments of the present invention, well-known techniques or repetitive descriptions that may unnecessarily obscure the gist of the present invention will be reduced or omitted.

1 is a cross-sectional view of an in-wheel motor device according to the present invention, and FIG. 2 is an exploded view of the in-wheel motor device according to the present invention. And, Figure 3 is an exploded view of the gearbox according to the present invention.

Hereinafter, an in-wheel motor device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

The present invention is an in-wheel motor device that prevents a phase difference caused by shaking by holding the concentricity of a ring gear and a carrier by mounting a separate gearbox having a planetary gear, a sun gear, and a ring gear in the housing.

That is, as shown in FIG. 1 , a motor assembly including a stator, a rotor, and the like and a gearbox 130 are mounted in the housing 110 to rotate the shaft 140 . By rotating to operate the wheel mounted on the outer diameter of the housing 111.

Referring to FIG. 2 , the gearbox 130 includes a gearbox housing 131 with both sides open and a cover 138 covering one surface of the gearbox housing 131 forming an external shape, and the gearbox housing 131 ) and the cover 138 are fastened by bolts 139 . The housing 131 and the cover 138 protect the internal components and prevent the inflow of foreign substances.

A carrier 132 having a circular cross-sectional shape is disposed adjacent to the open side in the gearbox housing 131 , and a first bearing 133-1 is mounted between the outer circumferential surface of the carrier 132 and the inner circumferential surface of the housing 131 . .

In addition, the concentricity of the carrier 132 may be maintained by the first bearing 133 - 1 , and a phase difference may be reduced in meshing with the ring gear and the sun gear.

In addition, a sun gear 136 through which the shaft 140 passes, and three planetary gears 135 are meshed and disposed between the sun gear 136 and the ring gear 137 .

The planetary gear 135 is coupled to a hole formed in the carrier 132 by a gear pin 134, and a pair of snap rings R are coupled to each gear pin 134 to fix the gear pin 134, A third bearing 133 - 3 is interposed between each gear pin 134 and each planetary gear 135 .

One side body 136 - 1 extending in one direction of the sun gear 136 is inserted into a hole formed in the cover 138 , and the second bearing 133 - 2 is connected to the sun gear 136 and the cover 138 . It is fastened between the formed holes.

As the gearbox 130 is configured in this way, it functions to transmit power and decelerate or increase torque by the sun gear 136 , and when the sun gear 136 rotates about the shaft 140 as an axis (for this purpose, the sun gear 136 ) ) and the shaft 140 (there may be a gap), the planet gear 135 meshed outside the sun gear 136 rotates at the corresponding position by the fixed carrier 132, and accordingly the planet gear 135 ) The ring gear 137 meshed with the outside rotates to rotate the gearbox housing 131 .

In addition, a ring gear insertion groove is formed around the inner surface of the gearbox housing 131 , and the ring gear 137 is inserted and fixed into the ring gear insertion groove of the gearbox housing 131 , so that the ring gear 137 rotates. When the gearbox housing 131 rotates together.

In addition, as shown in FIG. 4 , the ring gear 137 is inserted and fixed into the ring gear insertion groove rather than the conventional press-fitting method to the in-wheel motor housing. Accordingly, the phase shift of the ring gear can be prevented by this fixing method and the bearings 133-1, 133-2, and 133-3 provided above and below.

Next, FIG. 3 is an exploded view of the entire in-wheel motor device.

The cover 190 is fastened to the open side of the cylindrical housing 110 by the cover coupling bolt B2.

The gearbox coupling bolt B1 is inserted into the bolt hole formed to correspond to the other side of the in-wheel motor housing 110 and the open side of the gearbox housing 131, respectively, to connect the gearbox 130 to the in-wheel motor housing 110. ) are combined in In addition, a snap ring (R) may be additionally coupled to fix the gearbox 130 .

A hole through which the shaft passes is formed on the other side of the in-wheel motor housing 110 , and the bearing 121 is coupled between the hole and the shaft 140 , so that the in-wheel motor housing 110 can rotate around the shaft 140 . will do

In addition, a hole through which the shaft passes is formed in the cover 190, the bearing 123 is coupled between the inner circumferential surface of the hole and the outer circumferential surface of the shaft 140, and an oil seal for waterproofing ( S) may be inserted.

Next, the hub 180 may have a cylindrical shape in which the shaft 140 is inserted through the central hole and fixed to the shaft 140 , and the lower surface thereof is opened.

And, the stator 170 is configured to be coupled to the outer peripheral surface of the cylindrical hub (180).

The rotor 150 (rotor) is provided in a disk shape, and double holes with different diameters are formed in the central portion 151 due to the step difference, and one side body 136 - 1 of the sun gear 136 is inserted into the more extended outer hole. and the shaft 140 passes through the inner hole, and the bearing 122 is coupled between the shaft 140 and the inner hole, so that the rotor 150 is rotatably configured.

Here, one side body 136 - 1 of the sun gear 136 and the rotor 150 may be coupled in a different way.

In addition, the magnet 160, which is a magnetic force source, is coupled to opposite ends of the outer portion 152 in the form of standing cylindrically from the outer periphery, and the outer portion 150-2 may be disposed to be spaced apart from the stator 170.

Thus, the rotor 150 is rotated by the electromagnetic force generated between the magnet 160 and the stator 170 .

4 is a view showing an operating state of the in-wheel motor device of the present invention.

First, when a current is applied to the fixed stator 170 and the rotor 150 rotates about the shaft 140 as an axis, the sun gear 136 coupled to the rotor 150 rotates.

As the sun gear 136 is rotated, the planetary gear 135 rotates, and as the planetary gear 135 rotates, the ring gear 137 meshed with the planetary gear 135 rotates about the shaft 140 as an axis. .

Accordingly, by the rotation of the ring gear 137, the gearbox housing 131 and the in-wheel motor housing 110 to which the ring gear 137 are fixedly coupled rotate the shaft 140 as an axis to rotate the in-wheel motor housing 110. The wheel combined with the outer circumferential surface of the wheel rotates.

As described above, in the in-wheel motor device according to the present invention, the gearbox is mounted in the entire housing, the ring gear is fixed in the gearbox, and the ring gear and the carrier are provided by the bearings disposed above and below the ring gear and the bearings coupled to the outer periphery of the carrier. Maintain concentricity so that the phase does not shift.

The present invention as described above has been described with reference to the illustrated drawings, but it is not limited to the described embodiments, and it is common knowledge in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Accordingly, such modifications or variations should be said to belong to the claims of the present invention, and the scope of the present invention should be interpreted based on the appended claims.

110: housing
121, 122, 123: bearing
130: gear box
131: housing
132: carrier
133-1, 133-2, 133-3: bearing
134: gear pin
135: planetary gear
136: sun gear 136-1: body
137: ring gear
138: cover
139: bolt
140: shaft
150: rotor
151: central part 152: outer part
160: magnet
170: stator
180 : Hub
190 : cover

Claims (15)

delete delete a housing having a hole through which the shaft passes;
a gearbox fastened to the inside of the housing and having a sun gear, a planetary gear and a ring gear built-in;
a rotor through which the shaft passes through the inner hole, and a bearing is coupled between the inner hole and the shaft;
a magnet matching the inside of the rotor;
a stator disposed inside the magnet; and
It is fixed to the shaft passing through the central hole, and includes a hub to which the stator is coupled to an outer circumferential surface,
The gearbox is
gearbox housing;
a sun gear disposed in the gearbox housing and through which the shaft passes;
a planetary gear meshed outside the sun gear;
a ring gear meshed with the planetary gear; and
It has a circular cross-sectional shape, comprising a carrier coupled to the planetary gear by a gear pin passing through the formed hole,
in-wheel motor unit. 4. The method of claim 3,
The gearbox is
Further comprising a first bearing mounted between the outer peripheral surface of the carrier and the inner peripheral surface of the housing,
in-wheel motor unit. 4. The method of claim 3,
A ring gear insertion groove is formed around the inner surface of the gearbox housing, and the ring gear is inserted and fixed in the ring gear insertion groove,
in-wheel motor unit. 4. The method of claim 3,
The gearbox is
Fastened to cover one surface of the gearbox housing, further comprising a cover having a hole through which the shaft passes,
in-wheel motor unit. 7. The method of claim 6,
The gearbox is
The one side body of the sun gear further includes a second bearing inserted into the hole formed in the cover and mounted between the sun gear and the hole formed in the cover,
in-wheel motor unit. 8. The method of claim 7,
Further comprising a third bearing mounted between the planetary gear and the gear pin,
in-wheel motor unit. 8. The method of claim 7,
In the rotor, an outer hole having a larger diameter than the inner hole is formed to be stepped with the inner hole, and one side body of the sun gear is inserted into the outer hole of the rotor,
in-wheel motor unit. a housing having a hole through which the shaft passes;
a gearbox fastened to the inside of the housing;
a rotor through which the shaft passes through the inner hole, and a bearing is coupled between the inner hole and the shaft;
a magnet matching the inside of the rotor; and
It includes a stator disposed inside the magnet,
The gearbox is
gearbox housing;
a sun gear disposed in the gearbox housing and through which the shaft passes;
a planetary gear meshed outside the sun gear; and
and a ring gear meshed with the planetary gear;
A ring gear insertion groove is formed around the inner surface of the gearbox housing, and the ring gear is inserted and fixed in the ring gear insertion groove,
in-wheel motor unit. 11. The method of claim 10,
The gearbox is
Further comprising a carrier having a circular cross-sectional shape and coupled to the planetary gear by a gear pin passing through the formed hole,
in-wheel motor unit. 12. The method of claim 11,
The gearbox is
Further comprising a first bearing mounted between the outer peripheral surface of the carrier and the inner peripheral surface of the housing,
in-wheel motor unit. 13. The method of claim 12,
The gearbox is
Fastened to cover one surface of the gearbox housing, further comprising a cover having a hole through which the shaft passes,
in-wheel motor unit. 14. The method of claim 13,
The gearbox is
The one side body of the sun gear further includes a second bearing inserted into the hole formed in the cover and mounted between the sun gear and the hole formed in the cover,
in-wheel motor unit. 15. The method of claim 14,
Further comprising a third bearing mounted between the planetary gear and the gear pin,
in-wheel motor unit.

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