KR20230079945A - Traction Motors For Automobiles With Bearing Lubrication Structures. - Google Patents

Abstract

The present invention relates to a traction motor for providing power to an electric vehicle, and it is possible to reduce the amount of lubricant used and maximize lubrication performance by supplying lubricant to a bearing chamber through a hollow part and a spray hole formed in a drive shaft for lubrication.

Description

Traction Motors For Automobiles With Bearing Lubrication Structures.}

The present invention relates to a traction drive motor for powering an electric vehicle.

An electric vehicle is a vehicle that moves using a motor driven by electricity, and is eco-friendly with less emission of pollutants due to reduction in the use of fossil fuels, and has advantages in fuel efficiency due to high efficiency. In general, permanent magnet synchronous motors are mainly employed in automobiles, and include a stator wound with a coil through which current flows and a rotor having permanent magnets. The rotor magnetically interacts with the stator to rotate, and power is transmitted by a driving shaft coupled to the rotor.

Lubricating oil for cooling and lubricating bearings supporting the shaft of the motor is accommodated inside the conventional electric motor. Lubricating oil stored in the lower part of the motor is transferred to the upper part by the rotating rotor and sprayed to the bearing to perform cooling and lubrication.

In addition, a method of injecting grease into the bearing and then sealing it to lubricate the bearing without a separate supply of lubricating oil is also used.

In such a conventional cooling and lubrication system, a large amount of lubricating oil is required to cool and lubricate the bearing, and since the lubricating oil scattering method is not a method in which the lubricating oil is directly supplied to the bearing, the amount of oil required for bearing lubrication is There are problems such as poor rotation performance because it is not constant,

The method of lubricating by injecting grease into the bearing has problems such as the need to periodically inject grease when the grease is consumed, and a solution to this problem is needed.

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

The present invention provides bearing lubrication that can maximize lubrication performance with a small amount of lubricant by supplying lubricating oil to the bearing chamber where the bearing is installed through a hollow part and a spray hole formed in a drive shaft and returning the lubricating oil through a discharge passage communicating with the bearing chamber. Its object is to provide a traction drive motor for automobiles including a structure.

A traction drive motor for a vehicle including a bearing lubrication structure according to at least one embodiment of the present invention includes a stator; rotor; a housing having an accommodation space in which the stator is accommodated; a first bearing chamber formed on one side in the axial direction inside the housing; a second bearing chamber formed on the other side of the axial direction inside the housing; a first bearing installed in the first bearing chamber; a second bearing installed in the second bearing chamber; A hollow part rotatably supported by the first bearing and the second bearing and formed in an axial direction, and a first injection hole and a second injection hole communicating the hollow part with the first bearing chamber and the second bearing chamber. a drive shaft including a hole; and a discharge passage through which lubricating oil introduced into the first bearing chamber and the second bearing chamber is discharged.

In at least one embodiment of the present invention, a first outlet and a second outlet communicating with the discharge passage are formed in the first bearing chamber and the second bearing chamber at positions set so that the introduced lubricating oil overflows at a set height. do.

In at least one embodiment of the present invention, the housing includes a first bearing part providing the first bearing chamber and a first extension part extending outward in a radial direction from the first bearing part, and the second bearing part. A second bearing part providing a seal and a second extension part extending outward in a radial direction from the second bearing part, wherein the first bearing part is axially spaced apart from the outer part in the axial direction of the first bearing to perform first injection A first vertical wall providing a space, wherein the second bearing part includes a second vertical wall spaced apart from an axially outer portion of the second bearing in an axial direction to provide a second spraying space, The hole is directly exposed to the first spraying space, and the second spraying hole is directly exposed to the second spraying space.

In at least one embodiment of the present invention, a first discharge port formed on the opposite side of the first injection space based on the first bearing and a second discharge port formed on the opposite side of the second injection space based on the second bearing do.

In at least one embodiment of the present invention, a first bearing cover covering the first bearing chamber at an axially inner side of the first bearing and including the first discharge port, and an axially inner portion of the second bearing and a second bearing cover covering the second bearing chamber at a side and including the second outlet.

In at least one embodiment of the present invention, the first bearing cover includes a 1-1 discharge passage formed radially outward from the first outlet, and the second bearing cover includes a radial direction from the second outlet. and a 2-1 discharge passage formed outwardly, wherein the first bearing part communicates with the 1-1 discharge passage and includes a 1-2 discharge passage extending in an axial direction, and the second bearing part communicates with the 1-1 discharge passage and includes a 1-2 discharge passage. It communicates with the 2-1 discharge passage and includes a 2-2 discharge passage extending in the axial direction.

In at least one embodiment of the present invention, the first extension part includes a 1-3 discharge passage communicating with the 1-2 discharge passage and extending in a radial direction, and the second extension part communicates with the 1-2 discharge passage. It communicates with the 2 discharge passage and includes a 2-3 discharge passage extending in the radial direction.

In at least one embodiment of the present invention, the housing is formed in an axial direction and includes a recovery passage communicating with the first to third discharge passage and the second to third discharge passage.

In at least one embodiment of the present invention, the first discharge port is located at a position lower than the center of the bearing ball located in the 6 o'clock direction of the lowermost gravity load direction among the bearing balls of the first bearing, and the second The outlet is located at a position lower than the center of the bearing balls of the second bearing located in the 6 o'clock direction in the direction of the lowermost gravity load.

In at least one embodiment of the present invention, the drive shaft includes a lubricating oil input portion including one end of the hollow portion, and the housing supplies the lubricating oil pumped into the lubricating oil supply space exposed to the lubricating oil input portion and the lubricating oil supply space. And a lubricant seal is installed between the lubricant input unit and the inner circumference of the lubricant supply space.

In at least one embodiment of the present invention, the first spray hole or the second spray hole is formed in an oblique direction from the hollow part.

In at least one embodiment of the present invention, the first and second bearing parts are integrally formed by aluminum casting in a state in which a steel insert ring for surrounding the outer ring of the bearing is inserted into a mold.

Lubrication performance can be maximized with a small amount of lubricant by supplying lubricant to the bearing chamber through the hollow part and injection hole formed on the drive shaft.

The effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

1 is a diagram showing a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.
2 is a front view of a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.
3 is a cross-sectional view A - A of FIG. 2 .
4 is an A-A sectional perspective view of FIG. 2;
FIG. 5 is a cross-sectional view A-A of FIG. 2, showing another embodiment of a first spray hole and a second spray hole.
6 is a view showing first and second bearing covers of a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.
7 is a view showing a state in which a second bearing cover is coupled to a housing cover in an automobile traction drive motor including a bearing lubrication structure according to an embodiment of the present invention.
8 is a B-B cross-sectional view of FIG. 7;
9 is a view showing a state in which a second bearing cover is separated from a housing cover in an automobile traction drive motor including a bearing lubrication structure according to an embodiment of the present invention.
10 is a view in which a passage groove of a second bearing cover in a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention is indicated by a dotted line.
FIG. 11 is a view showing a state in which a first outlet formed in a housing body and a 1-1 discharge passage are connected in a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.
12 is a view showing a state in which a second outlet formed in a housing cover and a 2-1 discharge passage are connected in a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.
13 is an enlarged view A of FIG. 4 .
FIG. 14 is an enlarged B view of FIG. 4 .

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

Terms including ordinal numbers such as “first” and “second” may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

The term "and/or" is used to include any combination of a plurality of items that are the subject matter. For example, "A and/or B" means including all three cases such as "A", "B", and "A and B".

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

In the description of the embodiments, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or pattern. The substrate formed on includes all those formed directly or through another layer. The criterion for "up/up" or "down/down" is based on the appearance shown in the drawing for convenience, and is only used to indicate the relative positional relationship between components for convenience, and is intended to limit the location of actual components. should not be understood For example, “above B” only indicates that B is shown above A on the drawing, unless otherwise stated or when A or B must be located above B due to the nature of A or B, and B in actual products, etc. may be located under A, or B and A may be placed sideways.

In addition, since the thickness or size of each layer (film), region, pattern, or structure in the drawing may be modified for clarity and convenience of description, it does not entirely reflect the actual size.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

1 shows a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention, and FIG. 2 is a front view of a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention, Figure 3 shows a cross section A - A of FIG. 2, Figure 4 is a perspective view of the cross section A - A of FIG. 6 shows first and second bearing covers of a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.

In addition, Figure 7 is a view showing a state in which the second bearing cover is coupled to the housing cover in the vehicle traction drive motor including a bearing lubrication structure according to an embodiment of the present invention, Figure 8 is a B - B cross-section of Figure 7, 9 shows a state in which a second bearing cover is separated from a housing cover in a traction drive motor for a vehicle including a bearing lubrication structure according to an embodiment of the present invention.

And, Figure 10 is a dotted line diagram showing the lubrication oil receiving groove of the second bearing cover in the automobile traction drive motor including the bearing lubrication structure according to an embodiment of the present invention, Figure 11 is a view according to an embodiment of the present invention In an automobile traction drive motor including a bearing lubrication structure, a first outlet formed in a housing body and a 1-1 discharge passage are connected, and FIG. 12 is an automobile traction drive including a bearing lubrication structure according to an embodiment of the present invention. It shows a state in which the second outlet formed in the housing cover of the motor and the 2-1 discharge passage are connected.

Finally, FIG. 13 is an enlarged view A of FIG. 4 and FIG. 14 is an enlarged view B of FIG.

1 to 14, the overall configuration of the traction drive motor for automobiles including the bearing lubrication structure will be described.

A traction drive motor for a vehicle including a bearing lubrication structure according to at least one embodiment of the present invention includes a stator 100, a rotor 110, a housing 120 and 290, a first bearing chamber 130, and a second bearing chamber ( 300), a drive shaft 420, and a discharge passage.

The discharge passage includes a 1-1 discharge passage 220, a 1-2 discharge passage 230, a 1-3 discharge passage 240, a 2-1 discharge passage 370, and a 2-2 discharge passage to be described later. It includes a flow path 380, a second-third discharge flow path 390 and a recovery flow path 410.

The stator 100 is fixed within the housing and may have a cylindrical shape. In an embodiment, one or more coils through which current flows may be wound around the stator 100 .

The rotor 110 is installed in the housings 120 and 290 and can rotate by magnetically interacting with the stator 100 . In an embodiment, a permanent magnet may be inserted into and fixed to the rotor 110 so as to interact with a magnetic field generated by a current flowing in a coil of a faulty person.

The housings 120 and 290 have accommodation spaces in which the stator 100 and the rotor 110 are accommodated. The housings 120 and 290 include a housing body 120 and a housing cover 290 .

The housing body 120 includes a first bearing part 140 providing a first bearing chamber 130, a first extension part 150 extending radially outward from the first bearing part 140, and a first extension part. It includes a cylindrical portion 170 extending in the axial direction from (150).

The first bearing chamber 130 is formed on one side of the housing body 120 in the axial direction.

The first bearing 250 is installed in the first bearing chamber 130 . The first bearing 250 includes an outer race 260 and an inner race 270, and a plurality of bearing balls 280 are provided between the inner race 260 and the outer race 270. In this embodiment, a ball bearing is used, and a roller bearing may be used according to an embodiment.

The first bearing part 140 is formed to surround the first bearing chamber 130, and is axially spaced apart from the outer portion of the first bearing 250 in the axial direction to provide the first spraying space 180. It includes a straight wall (160).

A first bearing cover 190 is installed on the first bearing part 140 of the housing body 120 . A first coupling hole 200 to which the drive shaft 420 is coupled is formed in the center of the first bearing cover 190 . The first bearing cover 190 covers the first bearing chamber 130 at the inner side in the axial direction of the first bearing 250 and has a first outlet 210 formed therein.

The first discharge port 210 is formed on the opposite side of the first injection space 180 based on the first bearing 250 so that the lubricating oil is discharged after contacting the bearing ball 280, thereby maximizing lubricating performance.

The first discharge port 210 is formed to communicate with the discharge passage at a position set so that the lubricating oil flowing into the first bearing chamber 130 overflows at a set height. Here, the set position of the first outlet 210 is a position spaced apart from the vertical reference line (a) by θ ₁ as shown in FIG. 11 . θ ₁ may be about 40 ± 5 degrees.

When the first outlet 210 is formed at a position spaced apart by θ ₁ , lubricating oil is stored up to a set height, specifically, a height equal to the diameter of the outer ring of the first bearing 250.

The first bearing cover 190 includes a first lubricant receiving groove 215 extending in a circumferential direction from an end of the 1-1 discharge passage 220 . Lubricating oil is stored in the first lubricating oil receiving groove 215 .

In addition, the first bearing body 120 includes a 1-1 discharge passage 220 formed radially outward from the first discharge port 210 as shown in FIG. 11 . The 1-1 discharge passage 220 is formed as the end of the first lubricant receiving groove 215 extends radially inward, while the first bearing cover 190 covers the first bearing chamber 130 of the housing. When combined, the position of the groove is positioned at the inlet of the 1-2 discharge passage 230 to be described later, and the 1-1 discharge passage 220 and the 1-2 discharge passage 230 are connected.

The first bearing part 140 communicates with the 1-1 discharge passage 220 and includes a 1-2 discharge passage 230 extending in the axial direction. In the 1-2 discharge passage, the 1-2 discharge passage 230 is formed by combining the passage groove formed on the outer circumferential surface of the first insert ring 510 and the passage groove formed in the first bearing part 140 .

The first extension part 150 communicates with the 1-2 discharge passage 230 and has a 1-3 discharge passage 240 extending in the radial direction.

The housing body 120 includes a recovery passage 400 formed on an outer surface in an axial direction and communicating with the first to third discharge passages 240 . The recovery passage 400 is formed with an outlet nipple 480, and the outlet nipple 480 is connected to a lubricating oil pump (not shown) through a nozzle (not shown).

The housing cover 290 includes a second bearing part 310 providing a second bearing chamber 300 and a second extension part 320 extending radially outward from the second bearing part 310 .

The second bearing chamber 300 is formed on the other side of the housing cover 290 in the axial direction.

The second bearing 250 is installed in the second bearing chamber 300 . Like the first bearing 250, the second bearing 250 uses a ball bearing, and depending on embodiments, a roller bearing may be used.

The second bearing part 310 is formed to surround the first bearing chamber 130, and is axially spaced apart from the outer part of the second bearing 250 in the axial direction to provide the second spraying space 340. A straight wall 330 is included.

A second bearing cover 335 is installed on the second bearing part 310 of the housing cover 290 . A second coupling hole 350 to which the drive shaft 420 is coupled is formed in the center of the second bearing cover 335 . The second bearing cover 335 covers the second bearing chamber 300 at the inner side of the second bearing 250 in the axial direction and has a second outlet 360 formed therein.

The second outlet 360 is formed on the opposite side of the second injection space 340 based on the second bearing 250 so that the lubricating oil is discharged after contacting the bearing ball 280, thereby maximizing lubricating performance.

The second outlet 360 is formed to communicate with the discharge passage at a position set so that the lubricating oil introduced into the second bearing chamber 300 overflows at a set height. Here, the set position of the second outlet 360 is a position spaced apart from the vertical reference line (a) by θ ₂ as shown in FIG. 12 . θ ₂ may be about 40 ± 5 degrees.

When the second outlet 360 is formed at a position spaced apart by θ ₂ , lubricating oil is stored up to a set height, specifically, a height of about half of the diameter of the outer ring 260 of the second bearing 400.

The second bearing cover 335 includes a second lubricant receiving groove 365 extending in the circumferential direction from the end of the 2-1 discharge passage 370 . Lubricating oil is stored in the second lubricating oil receiving groove 365 .

In addition, the second bearing cover 335 includes a 2-1 discharge passage 370 formed radially outward from the second outlet 360 as shown in FIG. 12 . The 2-1 discharge passage 370 is formed as the end of the second lubricant receiving groove 365 extends radially inward, and the second bearing cover 335 covers the second bearing chamber 300 of the housing. When coupled, the 2-1 discharge channel 370 and the 2-2 discharge channel 380 are connected while being positioned at the inlet of the 2-2 discharge channel 380 to be described later.

The second bearing part 310 communicates with the 2-1 discharge passage 370 and includes a 2-2 discharge passage 380 extending in the axial direction. The 2-2 discharge flow path is formed by combining the flow path groove formed on the outer circumferential surface of the second insert ring 511 and the flow path groove formed on the second bearing part 310 .

The second extension part 320 communicates with the 2-2 discharge passage 380 and has a 2-3 discharge passage 390 extending in the radial direction.

The 2-3 discharge passage 390 is connected to the above-mentioned recovery passage 400.

The housings 120 and 290 of the automobile traction drive motor including the bearing lubrication structure of the present invention are made of aluminum to reduce weight. When the bearings 250 and 400 are directly installed in the bearing chambers 130 and 300, heat The coupling force is weakened, causing serious vibration or a problem in which the supporting force of the driving shaft 420 is weakened. To solve this problem, the first bearing part 140 and the second bearing part 310 are in a state where the first insert ring 510 and the second insert ring 511 for surrounding the outer ring of the bearing are inserted into the mold. The first insert ring (inserted into the housings 120 and 290) by being integrally formed by aluminum casting and cutting a part of the outer circumferential surfaces of the first insert ring 510 and the second insert ring 511 to have a D-cut shape. 510) and the second insert ring 511 are not rotated.

The first insert ring 510 and the second insert ring 511 are formed to surround the outer circumferential surface and one side of the outer ring 260 of the first bearing 250 or the second bearing 400 .

In particular, by wrapping one side so that the first bearing 250 or the second bearing 400 is positioned in a spaced state without contacting the first vertical wall 160 or the second vertical wall 330, the first The injection space 180 and the second injection space 340 may be formed.

The first insert ring 510 and the second insert ring 511 may be made of stainless steel.

The driving shaft 420 is rotatably supported by the first bearing 250 and the second bearing 250 . The drive shaft 420 includes a hollow part 450 formed in an axial direction, a first spray hole 430 and a second spray hole 440 . The first spray hole 430 is directly exposed to the first spray space 180 , and the second spray hole 440 is directly exposed to the second spray space 340 . The first spray hole 430 and the second spray hole 440 serve to communicate with the hollow part 450 so that the lubricating oil is sprayed into the first bearing chamber 130 and the second bearing chamber 300 .

Through this, the lubricating oil introduced into the hollow part 450 is discharged to the first spraying hole 430 and the second spraying hole 440 by the centrifugal force caused by the rotation of the drive shaft 420, and the first bearing chamber 130 And lubricating oil is supplied to the second bearing chamber 300 .

As shown in FIGS. 3 and 4 , the first spray hole 430 is formed in a radial direction to spray lubricating oil.

According to an embodiment, the first spray hole 430 and the second spray hole 440 may be formed in an oblique direction from the hollow part 450 as shown in FIG. 5 . In particular, since the first injection hole 430 is far from the lubricant input unit 460 into which lubricant is introduced, the pressure injected in the radial direction is inevitably low. In order to solve this problem, the present invention forms the first injection hole 430 radially outward, but is formed obliquely in the outward direction of the direction (A) in which the lubricant moves in the hollow part 450, so that the lubricant can be sprayed smoothly. let it be Depending on the embodiment, the second spray hole 440 may also be formed in an oblique line.

The driving shaft 420 includes a lubricating oil input unit 460 including one end of the hollow part 450 .

The housing cover 290 includes a lubricating oil supply space 490 where the lubricating oil input unit 460 is exposed and an inlet nipple 470 for supplying the lubricating oil pumped into the lubricating oil supply space 490, and the lubricating oil input unit 460 and the lubricating oil A lubricant seal 500 is installed between the inner circumference of the supply space 490 .

The inlet nipple 470 is connected through a lubricating oil pump (not shown) and a nozzle (not shown). The lubricating oil pump supplies lubricating oil to the inlet nipple 470, and the supply pressure at this time may be about 1.5 atm.

Although the above has been described with reference to the embodiments, these are only examples and do not limit the present invention, and those skilled in the art to which the present invention belongs will not deviate from the essential characteristics of the present embodiment. It will be appreciated that various variations and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

100: stator
110: rotor
120: housing body
130: first bearing room
140: first bearing part
150: first extension
160: first vertical wall
170: cylindrical part
180: first injection space
190: first bearing cover
200: first coupling hole
210: first outlet
215: first lubricant receiving groove
220: 1-1 discharge passage
230: 1-2 discharge passage
240: 1-3 discharge passage
250: first bearing
260: outer ring
270: inner ring
280: bearing ball
290: housing cover
300: second bearing room
310: second bearing part
320: second extension
330: second vertical wall
335: second bearing cover
340: second injection space
350: second coupling hole
360: second outlet
365: second lubricant receiving groove
370: 2-1 discharge passage
380: 2-2 discharge passage
390: 2-3 discharge passage
400: second bearing
410: recovery passage
420: drive shaft
430: first injection hole
440: second injection hole
450: hollow part
460: lubricant input unit
470: inlet nipple
480: outlet nipple
490: lubricant supply space
500: lubricant seal
510: first insert ring
511: second insert ring

Claims (12)

stator;
rotor;
a housing having an accommodation space in which the stator is accommodated;
a first bearing chamber formed on one side in the axial direction inside the housing;
a second bearing chamber formed on the other side of the axial direction inside the housing;
a first bearing installed in the first bearing chamber;
a second bearing installed in the second bearing chamber;
A hollow part rotatably supported by the first bearing and the second bearing and formed in an axial direction, and a first injection hole and a second injection hole communicating the hollow part with the first bearing chamber and the second bearing chamber. a drive shaft including a hole; and
A discharge oil for discharging the lubricating oil introduced into the first bearing chamber and the second bearing chamber.
including,
traction drive motor. According to claim 1,
In the first bearing chamber and the second bearing chamber, a first discharge port and a second discharge port communicating with the discharge passage are formed at positions set so that the introduced lubricating oil overflows at a set height,
traction drive motor. According to claim 1,
The housing includes a first bearing part providing the first bearing chamber, a first extension part radially outwardly extending from the first bearing part, a second bearing part providing the second bearing chamber, and the second bearing part providing the second bearing chamber. 2 includes a second extension extending radially outward from the bearing portion;
The first bearing part includes a first vertical wall spaced apart from the axially outer part of the first bearing in the axial direction to provide a first injection space, and the second bearing part is axially spaced apart from the axially outer part of the second bearing in the axial direction. And a second vertical wall spaced apart to provide a second injection space,
The first spray hole is directly exposed to the first spray space, and the second spray hole is directly exposed to the second spray space.
traction drive motor. According to claim 3,
Including a first discharge port formed on the opposite side of the first injection space based on the first bearing and a second discharge port formed on the opposite side of the second injection space based on the second bearing,
traction drive motor. According to claim 4,
A first bearing cover covering the first bearing chamber at the axially inner side of the first bearing and including the first discharge port, and covering the second bearing chamber at the axially inner side of the second bearing and Including a second bearing cover including a second outlet,
traction drive motor. According to claim 5,
The first bearing cover includes a 1-1 discharge passage formed radially outward from the first discharge port, and the second bearing cover includes a 2-1 discharge passage formed radially outward from the second discharge port. and
The first bearing part includes a 1-2 discharge passage communicating with the 1-1 discharge passage and extending in an axial direction, and the second bearing part communicates with the 2-1 discharge passage and extends in an axial direction. Including the 2-2 discharge passage,
traction drive motor. According to claim 6,
The first extension part includes a 1-3 discharge passage communicating with the 1-2 discharge passage and extending in a radial direction, and the second extension portion communicates with the 2-2 discharge passage and extends in a radial direction. Including the 2-3 discharge passage,
traction drive motor. According to claim 7,
The housing is formed in the axial direction and includes a recovery passage communicating with the 1-3 discharge passage and the 2-3 discharge passage,
traction drive motor. According to claim 4,
The first outlet is located at a position lower than the center of the bearing ball located in the 6 o'clock direction of the lowermost gravity load direction among the bearing balls of the first bearing,
The second outlet is located at a position lower than the center of the bearing ball located in the 6 o'clock direction of the lowermost gravity load direction among the bearing balls of the second bearing,
traction drive motor. According to claim 1,
The drive shaft includes a lubricating oil input portion including one end of the hollow portion,
The housing includes a lubricating oil supply space exposed to the lubricating oil input unit and an inlet nipple for supplying lubricating oil pumped into the lubricating oil supply space,
A lubricant seal is installed between the lubricant input unit and the inner circumference of the lubricant supply space,
traction drive motor. According to claim 1,
The first injection hole or the second injection hole is formed in an oblique direction from the hollow,
traction drive motor. According to claim 3,
The first and second bearing parts are integrally formed by aluminum casting in a state in which an insert ring of steel material for surrounding the outer ring of the bearing is inserted into a mold,
traction drive motor.

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