KR20240003168A - Lubrication structure of electric vehicle bearings - Google Patents

Abstract

The present invention relates to a lubrication structure for electric vehicle bearings. The lubrication structure of this electric vehicle bearing consists of a parking gear in contact with the bearing being inserted into the space inside the bearing and including an extension part in contact with the inner ring of the bearing, and the extension guides the movement of oil so that oil flows into the bearing. It is composed of

Description

Lubrication structure of electric vehicle bearings {LUBRICATION STRUCTURE OF ELECTRIC VEHICLE BEARINGS}

The present invention relates to a lubrication structure for an electric vehicle bearing. More specifically, the parking gear in contact with the bearing is inserted into the space inside the bearing and includes an extension part in contact with the inner ring of the bearing, thereby forming a bearing ball inside the bearing. This relates to a lubrication structure for electric vehicle bearings through which oil can be easily moved.

In general, oil is used to lubricate bearings and gears in the drive system of electric vehicles. Securing lubrication or cooling performance of gears and bearings through oil circulation is a factor that directly affects the performance and durability of the reducer and vehicle noise.

Figure 1 is a diagram showing an example of a conventional electric vehicle driving system.

Referring to FIG. 1, the electric vehicle drive system 1000 includes a resolver 1100, a B3 bearing 1200, a rotor core 1300, a B2 bearing 1400, a parking gear 1500, and an input gear 1600. ), B1 bearing 1700, and motor shaft 1800.

Meanwhile, there is a problem that oil moving from the parking gear 1500 to the B2 bearing 1400, among the oil moving inside the conventional electric vehicle drive system 1000, does not move effectively.

Figure 2 is a diagram showing the B2 bearing and parking gear included in a conventional electric vehicle drive system.

Specifically, referring to FIG. 2, in the conventional electric vehicle drive system 1000, the end of the parking gear 1500 extending in a direction parallel to the rotation axis is configured to simply contact the inner ring of the B2 bearing 1400. This is because the oil moving to the B2 bearing 1400 after passing the parking gear 1500 cannot effectively move inside the B2 bearing 1400.

As mentioned above, in the electric vehicle drive system, the movement and circulation of oil affects the performance and durability of the reducer, vehicle noise, etc., so if the oil is not able to move effectively past the parking gear and inside the bearing, the performance of the reducer will deteriorate. problems may occur.

Therefore, there is a need to develop a lubrication structure for electric vehicle bearings that allows oil moving into the bearing after passing the parking gear to move more effectively inside the bearing.

One object of the present invention is to provide a lubrication structure for an electric vehicle bearing that allows oil flowing into the bearing after passing the parking gear to move more effectively inside the bearing.

Another object of the present invention is to provide a lubrication structure for electric vehicle bearings that can improve the performance and durability of the reducer of the electric vehicle drive system.

The object of the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

As a technical means for achieving the above-mentioned technical problem, the lubrication structure of an electric vehicle bearing according to an embodiment of the present invention includes an inner ring having an outer diameter of a first length, and an inner ring having a second length of the inner diameter. It includes a two-length outer ring, a plurality of bearing balls disposed inside an annular space formed between the inner ring and the outer ring, a bearing rotatable about a rotation axis, a plurality of gear grooves, and a plurality of gear stages; A gear part rotatable about the rotation axis, a connection part extending from the gear part in a direction parallel to the rotation axis so as to be rotatable about the rotation axis and surrounding the rotation axis, and a connection part extending from the connection part in a direction parallel to the rotation axis. It includes a parking gear including an extension portion formed by extending, wherein the parking gear is arranged so that the connection portion contacts the bearing, and the extension portion is inserted into the space while contacting the outer peripheral surface of the inner ring, and the plurality of bearings The movement of the oil can be guided so that the oil flows into the ball.

In addition, the extension portion is inserted into the space to prevent contact with the plurality of bearing balls, and the length difference between the outer diameter of the extension portion and the inner diameter of the extension portion is the length difference between the second length and the first length. It may be less than half of

Additionally, the outer peripheral surface of the connection portion and the outer peripheral surface of the extension portion may be connected on the same curved surface to form a guide surface.

Additionally, a plurality of guide grooves may be formed on the guide surface in a direction parallel to the rotation axis.

Additionally, the distances between the plurality of guide grooves along the guide surface may be the same.

In addition, a plurality of guide grooves are formed on the guide surface, and the guide grooves are formed to extend from a first point of the guide surface to a second point of the guide surface, and the first point is from the center of the rotation axis. A virtual first plane connecting the first point is located on the guide surface so as to pass through the gear groove, and the second point is a virtual second plane connecting the second point from the center of the rotation axis. It may be positioned on the guide surface to pass through the gear stage.

Additionally, the guide groove may be formed such that a line segment connecting the first point and the second point is inclined with a line segment extending from the first point in a direction parallel to the rotation axis.

Additionally, the guide groove may be formed so that the second point is located ahead of the first point in the rotation direction of the parking gear.

As a technical means for achieving the above-described technical problem, the lubrication structure of an electric vehicle bearing according to another embodiment of the present invention includes an inner ring having an outer diameter of a first length, and an inner ring having a second length of the inner diameter. It includes a two-length outer ring, a plurality of bearing balls disposed inside an annular space formed between the inner ring and the outer ring, a bearing rotatable about a rotation axis, a plurality of gear grooves, and a plurality of gear stages; A gear part rotatable about the rotation axis, a connection part extending from the gear part in a direction parallel to the rotation axis so as to be rotatable about the rotation axis and surrounding the rotation axis, and a connection part extending from the connection part in a direction perpendicular to the rotation axis. It includes a parking gear including an extension portion formed to extend, wherein the parking gear is arranged so that the connection portion contacts the bearing, and the extension portion is formed to extend from an end of the connection portion, so that oil flows to the plurality of bearing balls. The movement of the oil can be guided so that it flows in.

Specific details of other embodiments for solving the problem are included in the description and drawings of the invention.

According to the means for solving the problem of the present invention described above, the lubrication structure of the electric vehicle bearing according to the present invention includes an extension portion that contacts the inner ring of the bearing while the parking gear in contact with the bearing is inserted into the space inside the bearing, , The extension guides the movement of oil so that oil flows into the bearing, providing the effect of allowing oil to move more effectively inside the bearing.

In addition, since the oil is configured to effectively move inside the bearing past the parking gear, the oil can circulate more effectively within the electric vehicle drive system, improving the performance and durability of the reducer of the electric vehicle drive system. do.

Figure 1 is a diagram showing an example of a conventional electric vehicle driving system.
Figure 2 is a diagram showing the B2 bearing and parking gear included in a conventional electric vehicle drive system.
Figure 3 is a diagram showing the lubrication structure of an electric vehicle bearing according to the first embodiment of the present invention.
Figure 4 is a side cross-sectional view of the lubrication structure of an electric vehicle bearing.
Figure 5 is a diagram showing a parking gear in which a plurality of guide grooves are formed in a direction parallel to the rotation axis.
Figure 6 is a diagram showing a parking gear in which a plurality of inclined guide grooves are formed.
Figure 7 is a diagram for explaining the position where the guide groove of Figure 6 is formed as a parking gear.
Figure 8 is a diagram showing the lubrication structure of an electric vehicle bearing according to a second embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present application will be described in detail so that those skilled in the art can easily implement them. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present application in the drawings, parts that are not related to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, when a part is said to be “connected” to another part, this includes not only the case where it is “directly connected,” but also the case where it is “electrically connected” with another element in between. do.

Throughout the specification of the present application, when a member is said to be located “on” another member, this includes not only the case where the member is in contact with the other member, but also the case where another member exists between the two members.

Throughout the specification of the present application, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary. As used throughout the specification, the terms “about,” “substantially,” and the like are used to mean at or close to a numerical value when manufacturing and material tolerances inherent in the stated meaning are given, and are used to convey the understanding of the present application. Precise or absolute figures are used to assist in preventing unscrupulous infringers from taking unfair advantage of stated disclosures. As used throughout the specification, the terms “step of” or “step of” do not mean “step for.”

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the following description. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the lubrication structure of an electric vehicle bearing according to the first embodiment of the present invention will be described.

FIG. 3 is a diagram showing the lubrication structure of an electric vehicle bearing according to the first embodiment of the present invention, and FIG. 4 is a side cross-sectional view of the lubrication structure of the electric vehicle bearing.

3 and 4 , the lubrication structure 1 of an electric vehicle bearing includes a bearing 100 and a parking gear 200.

First, the bearing 100 will be described.

The bearing 100 may have the same structure as a conventional bearing, can rotate around a rotation axis, and includes an inner ring 110, an outer ring 120, and a bearing ball 130.

The inner ring 110 may be arranged to surround the rotation axis, and may be formed such that its outer diameter has a first length.

The outer ring 120 may be arranged to surround the inner ring 110 at a predetermined distance apart from the inner ring 110, and may be formed to have an inner diameter having a second length.

The bearing balls 130 may be formed in the same structure as conventional bearing balls, and a plurality of bearing balls may be disposed within the annular space formed between the inner ring 110 and the outer ring 120.

Next, the parking gear 200 will be described.

The parking gear 200 can rotate around a rotation axis and includes a gear portion 210, a connection portion 220, and an extension portion 230.

The gear unit 210 includes a plurality of gear grooves 212 and a plurality of gear stages 214 and may be configured to rotate around a rotation axis.

The connection portion 220 is formed to extend from the gear portion 210 in a direction parallel to the rotation axis so as to be rotatable about the rotation axis, and may surround the rotation axis. Meanwhile, the lubrication structure 1 of the electric vehicle bearing may be arranged so that the connection portion 220 is in contact with the bearing 100.

The extension portion 230 may be formed to extend from the connection portion 220 in a direction parallel to the rotation axis.

Then, the extension portion 230 is inserted into the ring-shaped space formed between the inner ring 110 and the outer ring 120 while contacting the outer peripheral surface of the inner ring 110, so that oil flows into the plurality of bearing balls 130. The movement of oil can be guided as much as possible.

Specifically, the extension part 230 may be inserted into the space as deeply as possible, but may be inserted into the space to prevent contact with the plurality of bearing balls 130. As shown in FIG. 4, the extension part 230 The length difference (T) between the outer diameter of the outer diameter and the inner diameter of the extension portion 230 will be less than half of the length difference between the second length, which is the inner diameter of the outer ring 120, and the first length, which is the outer diameter of the inner ring 110. You can.

Meanwhile, as shown in FIG. 4, the outer peripheral surface of the connecting portion 220 and the outer peripheral surface of the extension portion 230 may be connected on the same curved surface to form the guide surface 240.

And, as shown in FIG. 3, a guide groove 242 may be formed on the guide surface 240.

Figure 5 is a diagram showing a parking gear in which a plurality of guide grooves are formed in a direction parallel to the rotation axis.

For example, if described with reference to FIG. 5, a plurality of guide grooves 242 may be formed in a direction parallel to the rotation axis on the guide surface 240, and the plurality of guide grooves 242 may be formed on the guide surface 240. Accordingly, the distances apart from each other may be the same.

Figure 6 is a diagram showing a parking gear in which a plurality of inclined guide grooves are formed.

As another example, referring to FIG. 6, the guide surface 240 includes a guide formed to extend from the first point A of the guide surface 240 to the second point B of the guide surface 240. A groove 242 may be formed.

Figure 7 is a diagram for explaining the position where the guide groove of Figure 6 is formed as a parking gear.

Specifically, when described with reference to FIG. 7, the first point (A) is a guide surface such that the virtual first plane (P1) connecting the first point (A) from the center of the rotation axis passes through the gear bone 212. It is located at (240), and the second point (B) is on the guide surface (240) so that the virtual second plane (P2) connecting the second point (B) from the center of the rotation axis passes through the gear stage 214. can be located

This guide groove 242 may be formed so that the line segment connecting the first point (A) and the second point (B) is inclined with the line segment extending from the first point (A) in a direction parallel to the axis of rotation. As shown in Figure 6, the guide groove 242 may be formed so that the second point (B) is located ahead of the first point (A) in the rotation direction of the parking gear 200.

Hereinafter, the lubrication structure of an electric vehicle bearing according to a second embodiment of the present invention will be described.

Figure 8 is a diagram showing the lubrication structure of an electric vehicle bearing according to a second embodiment of the present invention.

When described with reference to FIG. 8 , the lubrication structure 2 of the electric vehicle bearing includes a bearing 300 and a parking gear 400.

First, the bearing 300 will be described.

The bearing 300 may have the same structure as a conventional bearing, can rotate around a rotation axis, and includes an inner ring 310, an outer ring 320, and a bearing ball 330.

The inner ring 310 may be arranged to surround the rotation axis.

The outer ring 320 may be spaced apart from the inner ring 310 by a predetermined distance and may be arranged to surround the inner ring 310 .

The bearing balls 330 may be formed in the same structure as conventional bearing balls, and a plurality of bearing balls may be disposed within the annular space formed between the inner ring 310 and the outer ring 320.

Next, the parking gear 400 will be described.

The parking gear 400 can rotate around a rotation axis and includes a gear portion 410, a connection portion 420, and an extension portion 430.

The gear unit 410 includes a plurality of gear grooves 212 and a plurality of gear stages 214 and may be configured to rotate around a rotation axis.

The connection portion 420 is formed to extend from the gear portion 410 in a direction parallel to the rotation axis so as to be rotatable about the rotation axis, and may surround the rotation axis. Meanwhile, the lubrication structure 2 of the electric vehicle bearing may be arranged so that the connection portion 420 is in contact with the bearing 300.

The extension part 430 may be formed to extend from the connection part 420 in a direction perpendicular to the rotation axis.

Specifically, as shown in FIG. 8, the extension portion 430 is formed to extend from the end of the connection portion 420 and can guide the movement of oil so that oil flows into the plurality of bearing balls 330.

In this way, the lubrication structure of the electric vehicle bearing according to the present invention is configured to include an extension part that contacts the inner ring of the bearing while the parking gear in contact with the bearing is inserted into the space inside the bearing, and the extension part allows oil to flow into the bearing. By guiding the movement of oil, it provides the effect of allowing oil to move more effectively inside the bearing.

In addition, since the oil is configured to effectively move inside the bearing past the parking gear, the oil can circulate more effectively within the electric vehicle drive system, improving the performance and durability of the reducer of the electric vehicle drive system. do.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

1, 2: Lubrication structure of electric vehicle bearings
100, 300: Bearing 110, 310: Inner ring
120, 320: Outer ring 130, 330: Bearing ball
200, 400: parking gear 210, 410: gear unit
220, 420: connection part 230, 430: extension part
240: guide surface 242: guide groove

Claims (9)

In the lubrication structure of electric vehicle bearings,
A bearing comprising an inner ring having an outer diameter of a first length, an outer ring having an inner diameter of a second length, and a plurality of bearing balls disposed inside an annular space formed between the inner ring and the outer ring, and rotatable about a rotation axis. ; and
A gear part including a plurality of gear grooves and a plurality of gear stages and rotatable about the rotation axis, extending from the gear part in a direction parallel to the rotation axis so as to be rotatable about the rotation axis, and surrounding the rotation axis. A parking gear including a connection part and an extension part extending from the connection part in a direction parallel to the rotation axis,
The parking gear is arranged so that the connection portion contacts the bearing,
The extension part is inserted into the space while contacting the outer peripheral surface of the inner ring, and guides the movement of the oil so that the oil flows into the plurality of bearing balls.
According to paragraph 1,
The extension portion is inserted into the space to prevent contact with the plurality of bearing balls,
The length difference between the outer diameter of the extension portion and the inner diameter of the extension portion is less than half the length difference between the second length and the first length.
According to paragraph 1,
A lubrication structure for an electric vehicle bearing, wherein the outer peripheral surface of the connection portion and the outer peripheral surface of the extension portion are connected on the same curved surface to form a guide surface.
According to paragraph 3,
A lubrication structure for an electric vehicle bearing in which a plurality of guide grooves are formed on the guide surface in a direction parallel to the rotation axis.
According to paragraph 4,
A lubrication structure for an electric vehicle bearing, wherein the plurality of guide grooves are spaced apart from each other along the guide surface at the same distance.
According to paragraph 3,
A plurality of guide grooves are formed on the guide surface,
The guide groove is formed to extend from a first point of the guide surface to a second point of the guide surface,
The first point is located on the guide surface so that a virtual first plane connecting the first point from the center of the rotation axis passes through the gear groove,
The second point is located on the guide surface so that a virtual second plane connecting the second point from the center of the rotation axis passes the gear stage.
According to clause 6,
The guide groove is formed so that a line segment connecting the first point and the second point is inclined with a line segment extending from the first point in a direction parallel to the rotation axis.
In clause 7,
A lubrication structure for an electric vehicle bearing in which the guide groove is formed so that the second point is located ahead of the first point in the rotation direction of the parking gear.
In the lubrication structure of electric vehicle bearings,
A bearing comprising an inner ring having an outer diameter of a first length, an outer ring having an inner diameter of a second length, and a plurality of bearing balls disposed inside an annular space formed between the inner ring and the outer ring, and rotatable about a rotation axis. ; and
A gear part including a plurality of gear grooves and a plurality of gear stages and rotatable about the rotation axis, extending from the gear part in a direction parallel to the rotation axis so as to be rotatable about the rotation axis, and surrounding the rotation axis. A parking gear including a connection part and an extension part extending from the connection part in a direction perpendicular to the rotation axis,
The parking gear is arranged so that the connection portion contacts the bearing,
The extension portion is formed to extend from the end of the connection portion and guides the movement of the oil so that the oil flows into the plurality of bearing balls.