KR102552436B1 - Lubricating oil circulation structure of high-speed bearings - Google Patents

Abstract

Provided is a lubricating oil circulation structure of a high-speed bearing according to an embodiment of the present invention. The lubricating oil circulation structure of the high-speed bearing is an inner ring in contact with the shaft of a motor mounted on a vehicle, an outer ring defining a discharge hole for discharging the lubricating oil, a plurality of balls disposed between the inner ring and the outer ring, a cage supporting the balls, and It is connected to the outer ring to seal the inner space defined by the inner ring and the outer ring, and includes two seals provided on one side and the other side of the outer ring, respectively, divided based on the direction in which the rotation axis of the outer ring extends, In a direction from the inner ring to the outer ring, one side of the outer ring has a smaller width than the other side, and a space between the sealing ring connected to one side of the outer ring and the inner ring is an inlet through which lubricating oil flows.

Description

Lubricating oil circulation structure of high-speed bearings}

The present invention relates to a lubricating oil circulation structure of a high-speed bearing capable of cooling the lubricating oil used for lubricating the high-speed bearing and removing foreign substances.

Ball bearings are applied to motors, spindles, and turbines that rotate at high speed, and serve to reduce energy loss due to friction that occurs when various parts of a machine pass each other while rotating. In general, a ball bearing may be composed of an inner ring, an outer ring, a cage disposed between the inner ring and the outer ring, and balls inserted into a pocket of the cage. In a ball bearing, the ball is continuously subjected to friction by the rotation of the machine to which it is applied, so the ball bearing is applied with lubricating oil. When lubricating oil is supplied to the ball bearing, a structure similar to a blocking wall is arranged around the ball to store the lubricating oil. With this structure, it is possible to ensure that the lubricating oil adheres to the surface of the ball, and on the other hand, it is possible to prevent the lubricating oil from being discharged to the outside of the ball bearing in a high-speed running state.

However, when the bearing rotates at a high speed, foreign substances may be generated in the steel ball, cage, inner ring, and outer ring made of metal. Foreign matter is a metal material and can cause failure of the bearing as well as the motor. In addition, the temperature of the lubricating oil inside the bearing is excessively increased due to the high-speed rotation of the bearing, causing a problem in that the lubricating performance of the lubricating oil is deteriorated. Therefore, there is a need to distinguish between oil for cooling the motor and oil for cooling and lubricating the bearing, and the need for controlling the temperature of the lubricating oil supplied to the bearing and removing foreign substances contained in the lubricating oil has emerged.

A technical problem of the present invention is to provide a lubricating oil circulation structure for a high-speed bearing capable of cooling the lubricating oil used for lubricating the high-speed bearing and removing foreign substances contained in the lubricating oil.

Provided is a lubricating oil circulation structure of a high-speed bearing according to an embodiment of the present invention. The lubricating oil circulation structure of the high-speed bearing is an inner ring in contact with the shaft of a motor mounted on a vehicle, an outer ring defining a discharge hole for discharging the lubricating oil, a plurality of balls disposed between the inner ring and the outer ring, a cage supporting the balls, and It is connected to the outer ring to seal the inner space defined by the inner ring and the outer ring, and includes two seals provided on one side and the other side of the outer ring, respectively, divided based on the direction in which the rotation axis of the outer ring extends, In a direction from the inner ring to the outer ring, one side of the outer ring has a smaller width than the other side, and a space between the sealing ring connected to one side of the outer ring and the inner ring is an inlet through which lubricating oil flows.

According to an example, the seal includes a first seal connected to one side of the outer ring and a second seal connected to the other side of the outer ring, and the first seal and the second seal have the same structure.

According to one example, the discharge hole is defined on the other side of the outer ring, and the entrance of the discharge hole is defined within a range of more than 0 degrees to less than 20 degrees based on a contact point where the ball and the outer ring meet.

According to one example, the distance between the outer race and the inner race increases as the ball toward the edge of one side of the outer race.

According to an example, a raceway surface into which the balls are inserted is defined on the outer ring, a connection groove through which lubricating oil can flow is defined on the raceway surface, and the connection groove removes the lubricating oil accumulated between the raceway surface and the balls. It serves to circulate within the bearing.

According to one example, a plurality of discharge holes are defined on the outer surface of the outer ring, and a first cavity in which lubricating oil stays and a second cavity in which lubricating oil discharged from the discharge holes flows in order to supply lubricating oil to the inlet Provided.

According to one example, further comprising a flow path through which the lubricating oil discharged from the discharge holes flows, and a pump provided on the flow path, wherein the pump discharges the lubricating oil from the bearing and supplies the lubricating oil to the inlet.

According to one example, a filter for removing foreign substances included in the lubricating oil is provided on the flow path, and the filter is disposed between the bearing and the pump.

According to one example, a cooling structure for cooling the lubricating oil is provided on the flow path, and the cooling structure is disposed between the bearing and the pump.

According to one example, the cooling structure includes heat sinks disposed on an outer surface of a motor housing surrounding the motor.

According to one example, a controller for controlling the pump is included, and the controller controls the driving amount or driving cycle of the pump in consideration of the speed of the vehicle or the rotational speed of the motor.

According to one example, a controller for controlling the pump is provided, a temperature sensor for measuring the temperature of the lubricating oil is provided in the passage, and the controller controls the driving amount or driving cycle of the pump according to the temperature of the lubricating oil.

According to an embodiment of the present invention, the lubricating oil circulation structure of the high-speed bearing circulates the lubricating oil injected into the bearing to cool the bearing and prevent damage to the bearing.

According to an embodiment of the present invention, the lubricating oil collected between the raceway surface defined on the outer ring and the balls is circulated within the bearing by the connecting groove, preventing the intensive accumulation of lubricating oil in one place, thereby improving the durability of the bearing. .

According to an embodiment of the present invention, the lubricating oil circulation structure of the high-speed bearing can improve cooling performance and foreign matter removal performance of the bearing according to the speed of the vehicle and the rotational speed of the motor to which the bearing is applied.

According to an embodiment of the present invention, the inner ring rotating together with the shaft of the motor has a symmetric structure in the direction in which the shaft extends, while the outer ring which does not rotate with the shaft has an asymmetric structure in the direction in which the shaft extends, and A structure in which the lubricating oil is smoothly supplied and the lubricating oil is not discharged to the outside of the bearing may be implemented.

1 is a diagram showing a lubricating oil circulation structure of a high-speed bearing according to an embodiment of the present invention.
2 is a view showing a cross section of a bearing according to an embodiment of the present invention.
3 is a view showing a state in which a part of a bearing according to an embodiment of the present invention is cut and then removed.
4 is an enlarged view of a part of a bearing according to an embodiment of the present invention.
5 is a view showing a raceway surface of an outer ring according to an embodiment of the present invention.
6 is a view showing a lubricating oil circulation structure of a high-speed bearing according to another embodiment of the present invention.
7 is a view showing a lubricating oil circulation structure of a high-speed bearing according to another embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only this embodiment makes the disclosure of the present invention complete, and the common knowledge in the technical field to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

In addition, in this specification, the names of the components are classified as first, second, etc., in order to classify them based on the relationship in which the names of the components are the same, and the order is not necessarily limited in the following description.

The detailed description is illustrative of the present invention. In addition, the foregoing is intended to illustrate and describe preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications are possible within the scope of the concept of the invention disclosed in this specification, within the scope equivalent to the described disclosure, and/or within the scope of skill or knowledge in the art. The described embodiment describes the best state for implementing the technical spirit of the present invention, and various changes required in specific application fields and uses of the present invention are also possible. Therefore, the above detailed description of the invention is not intended to limit the invention to the disclosed embodiments. Also, the appended claims should be construed to cover other embodiments as well.

1 is a view showing a lubricating oil circulation structure of a bearing according to an embodiment of the present invention.

Referring to FIG. 1 , a lubricating oil circulation structure 1 of a high-speed bearing may be implemented through a bearing 100, a pump 200, and a controller 500. The lubricating oil circulation structure 1 of the high-speed bearing can be applied to an eco-friendly vehicle. Eco-friendly vehicles include electric vehicles (EVs), fuel cell electric vehicles (FCEVs), hybrid electric vehicles (HEV/PHEV), or mild hybrid electric vehicles (MHEVs). can include

The bearing 100 may be applied to a vehicle to which a motor 10 mounted in an eco-friendly vehicle is applied. The motor 10 includes a stator (not shown) installed in the motor housing 20, a rotor (not shown) that rotates with magnetic force according to an electrical signal applied to the stator (not shown), and a rotor (not shown). It may include a shaft 50 that is rotated. Bearing 100 may be disposed on shaft 50 of motor 10 . For example, bearing 100 may be a ball bearing. The bearing 100 may be installed to reduce frictional force of the shaft 50 rotated by the motor 10 . Since the bearing 100 applied to the motor 10 rotating at high speed also rotates at high speed, the performance of the bearing 100 itself and the performance of the lubricating oil provided in the bearing 100 may be important. A plurality of bearings 100 may be disposed in the motor housing 20 . Unlike the above example, the bearing 100 may be applied to a transmission (not shown) applied to a vehicle.

The lubricating oil injected into the bearing 100 may be circulated through the flow path 80 . In general, the lubricating oil injected into the bearing 100 is circulated in the motor housing 20, but the excessive temperature rise of foreign substances and lubricating oil generated in the bearing 100 applied to the motor 10 rotating at high speed causes the motor ( 10) may affect its performance. Therefore, in the embodiment of the present invention, the lubricating oil for lubricating and cooling the bearing 100 may be applied to the bearing 100 separately from the lubricating oil for lubricating and cooling the motor 10 .

For example, the flow path 80 may have a structure disposed on an outer surface of the motor housing 20 . As another example, the flow path 80 may be provided as a separate structure without contacting the motor housing 20 . The oil passage 80 may circulate the lubricating oil discharged from the plurality of bearings 100 applied to the motor 10 . In the embodiment of the present invention, for convenience of description, a circulation structure of lubricating oil discharged from one bearing 100 will be described.

The lubricating oil discharged from the bearing 100 may be circulated along the flow path 80 by the operation of the pump 200 . The pump 200 may take out lubricating oil from the bearing 100 or supply the lubricating oil to the bearing 100 . For example, the pump 200 may be driven according to a predetermined driving cycle to circulate the lubricating oil. Alternatively, when the pump 200 is driven, the driving time, driving amount, and driving speed may be controlled based on various parameters such as vehicle information and lubricating oil temperature. The lubricating oil may be cooled while being circulated along the flow path 80 by the operation of the pump 200 . The cooled lubricating oil may be injected into the bearing 100 again to help improve the performance of the bearing 100 .

The controller 500 may control the pump 200 circulating the lubricating oil. For example, the controller 500 may be a motor control unit (MCU) that controls the operation of the motor 10, or may be a separate controller. The controller 500 may control the driving amount or driving cycle of the pump 200 .

For example, the controller 500 may control the driving amount or driving cycle of the pump 200 based on information about the vehicle speed and the rotational speed of the motor 10 . Information on the vehicle speed and the rotational speed of the motor 10 may be obtained through a speed sensor (not shown) mounted on the vehicle. As the vehicle speed and the rotational speed of the motor 10 increase, the rotational speed of the bearing 100 increases, and as the rotational speed of the bearing 100 increases, the temperature of the lubricating oil and the amount of foreign substances generated in the bearing 100 increase. It can be. Therefore, as the vehicle speed and the rotational speed of the motor 10 increase, the controller 500 may control the pump 200 by increasing the driving amount of the pump 200 or setting a shorter driving cycle. When the driving amount of the pump 200 is increased or the driving cycle is shortened, the temperature of the lubricating oil for cooling the bearing 100 can be lowered, and the cycle for removing foreign substances generated in the bearing 100 can be shortened.

According to an embodiment of the present invention, the lubricating oil circulation structure 1 of the high-speed bearing circulates the lubricating oil injected into the bearing 100 to cool the bearing 100 and prevent damage to the bearing 100.

According to an embodiment of the present invention, the lubricating oil circulation structure 1 of the high-speed bearing improves the cooling performance and foreign matter removal performance of the bearing 100 according to the rotational speed of the motor 10 and the speed of the vehicle to which the bearing 100 is applied. can make it Efficiency of the motor 10 may be increased by improving durability and performance of the bearing 100 .

2 is a view showing a cross section of a bearing according to an embodiment of the present invention, and FIG. 3 is a view showing a state in which a part of the bearing according to an embodiment of the present invention is cut and then removed.

1 to 3 , the bearing 100 may include an inner race 110, an outer race 130, a ball 150, a cage 170, and seal rings 190a and 190b.

The inner ring 110 has a ring shape and may contact the shaft 50 of the motor 10 . The inner ring 110 is configured to rotate together with the shaft 50, and left and right may be made symmetrically based on a direction perpendicular to the direction in which the shaft 50 extends. A first raceway surface 111, which is a space in which a plurality of balls 150 are disposed, may be defined on the inner surface of the inner ring 110. The first orbital surface 111 may mean a surface defining a concave space into which the balls 150 can be inserted. The first orbital surface 111 may be defined by the same number as the balls 150 .

The outer ring 130 has a ring shape and may be disposed on the outside of the inner ring 100 . A plurality of balls 150 may be disposed between the inner race 110 and the outer race 130. A second raceway surface 131, which is a space in which a plurality of balls 150 are disposed, may be defined on the inner surface of the outer ring 130. The second orbital surface 131 may mean a surface defining a concave space into which the balls 150 can be inserted. The second orbital surface 131 may be defined by the same number as the balls 150 . A discharge hole 135 for discharging the lubricating oil injected into the bearing 100 may be defined in the outer ring 130 . The discharge hole 135 may penetrate the outer ring 130 at an acute angle based on a direction from the inner ring 110 toward the outer ring 130 . In other words, the discharge hole 135 may be formed so as to move away from the center of the ball 150 toward the outer surface of the outer ring 130 or toward the edge of the outer ring 130. Lubricant accumulated between the balls 150 and the second raceway surface 131 may be discharged to the outside of the bearing 100 through the discharge hole 135 .

The position of the balls 150 in the cage 170 may be guided. The cage 170 may be disposed between the inner race 110 and the outer race 130 so as to cover all or part of the outer surfaces of the balls 150 . A space in which lubricating oil flows exists between the cage 170 and the ball 150, so that the lubricating performance of the ball 150 can be improved.

The outer ring 130 may be divided into one side and the other side. One side and the other side of the outer ring 130 may be divided based on the direction in which the rotation axis of the outer ring 130 extends. For example, one side and the other side may be divided based on the center of the ball 130 based on the direction in which the rotation axis of the outer ring 130 extends. In a direction from the inner ring 110 toward the outer ring 130, one side of the outer ring 130 may have a smaller width than the other side. In other words, one side and the other side of the outer ring 130 may be asymmetrical with respect to the center of the ball 150. Therefore, the distance between the outer race 130 and the inner race 110 may increase as the ball 150 moves towards the edge of one side of the outer race 130. A discharge hole 135 may be defined on the other side of the outer ring 130.

Sealings 190a and 190b may be provided on one side and the other side of the outer ring 130, respectively. Sealings 190a and 190b may be inserted into and fixed to grooves formed on one side and the other side of the outer ring 130, respectively. The seals 190a and 190b may prevent the lubricating oil injected into the bearing 100 from being discharged to the outside of the bearing 100 through a space between the inner ring 110 and the outer ring 130 . That is, the seals 190a and 190b may seal the inner space defined by the inner ring 110 and the outer ring 130 . The seals 190a and 190b may include a first seal 190a connected to one side of the outer ring 130 and a second seal 190b connected to the other side of the outer ring 130 . For example, the first seal 190a and the second seal 190b may have the same structure. The second seal 190b may contact the inner ring 110 to prevent lubricating oil from being discharged to the outside of the bearing 100 .

According to an embodiment of the present invention, the inner ring 110 that rotates together with the shaft 50 of the motor 10 has a symmetrical structure in the direction in which the shaft 50 extends, but the outer ring that does not rotate together with the shaft 50 130 may be manufactured in an asymmetrical structure in the direction in which the shaft 50 extends. Accordingly, a structure in which the lubricating oil is smoothly supplied into the bearing 100 and the lubricating oil is not discharged to the outside of the bearing 100 can be implemented without affecting the rotational performance of the bearing 100 .

4 is an enlarged view of a part of a bearing according to an embodiment of the present invention, and FIG. 5 is a view showing a raceway surface of an outer ring according to an embodiment of the present invention. For brevity of description, description of overlapping contents is omitted.

Referring to FIGS. 4 and 5 , the outer ring 130 may have an asymmetrical structure on the left and right sides with respect to the center C of the ball 150 . In other words, one side 130a and the other side 130b of the outer ring 130 may have an asymmetrical structure.

Due to the asymmetrical structure of the outer ring 130, the second seal 190b may contact the inner ring 110, but the first seal 190a may not contact the inner ring 110. The first distance h1 between the inner ring 110 and the outer ring 130 at the edge of one side 130a of the outer ring 130 based on the ball 150 is the other side of the outer ring 130 based on the ball 150 It may be greater than the second distance h2 between the inner ring 110 and the outer ring 130 at the edge of (130b). A space between the first seal 190a connected to one side of the outer ring 130 and the inner ring 110 may be defined as an inlet 105 through which lubricating oil flows. Lubricating oil may be injected into the bearing 100 through the inlet 105 .

The discharge hole 135 may be defined on the other side 130b of the outer ring 130. Discharge holes 135 may be formed on the outer ring 130 in the same number as the number of second raceway surfaces 131 . The ball 150 may contact the second raceway surface 131 of the outer ring 130, and the contact point between the ball 150 and the second raceway surface 131 of the outer ring 130 is defined as a contact point (P1). It can be. The discharge hole 135 may be defined to pass through the outer ring 130, the entrance of the discharge hole 135 may be defined on the second raceway surface 131 of the outer ring 130, and the discharge hole 135 The outlet may be defined on the outer surface of the outer ring (130). The inlet of the discharge hole 135 may be defined within a range of a predetermined angle (α) based on a contact point (P1) where the ball 150 and the outer ring 130 meet. For example, the preset angle α range may be set based on the center C of the ball 150, and the preset angle α range may be greater than 0 degrees and less than 20 degrees. The location of the contact point P1 may not overlap with the inlet of the discharge hole 135 . As the inlet of the discharge hole 135 is defined close to the contact point P1, the lubricating oil accumulated between the ball 150 and the outer ring 130 can be discharged to the outside of the bearing 100.

A connection groove 133 may be defined on the second raceway surface 131 defined on the outer ring 130 . The connecting groove 133 may have a concave shape in a direction from the inner ring 110 toward the outer ring 130 . The connection groove 133 may serve to circulate the lubricating oil accumulated between the second raceway surface 131 and the plurality of balls 150 . When the plurality of balls 150 come into contact with the second raceway surface 131 defined on the outer ring 130, there is a problem that the lubricating oil accumulates in the minute space between the balls 150 and the second raceway surface 131, The connection groove 133 prevents foreign substances contained in the lubricating oil from causing damage to the ball 150 or the second raceway 131 due to accumulation of lubricating oil between the specific ball 150 and the second raceway 131. can

For example, the discharge hole 135 may be formed so as not to overlap with the connection groove 133 . The entrance of the discharge hole 135 is defined within a range of a predetermined angle (α) based on the contact point P1 where the ball 150 and the outer ring 130 meet, and the discharge hole 135 and the connection groove 133 are may not overlap.

As another example, the discharge hole 135 may be formed to overlap the connection groove 133 . The connection groove 133 is a passage through which lubricating oil accumulates or flows. If an inlet is defined in the discharge hole 135 in the connection groove 133, the lubricating oil can be easily discharged to the outside of the bearing 100 through the discharge hole 135. can However, in this example, the inlet of the discharge hole 135 may be defined within a predetermined angle α range in the opposite direction to that shown in FIG. 4 based on the contact point P1 where the ball 150 and the outer ring 130 meet. can Specifically, the inlet of the discharge hole 135 may be defined in the center based on a direction perpendicular to a direction from the inner ring 110 toward the outer ring 130.

The ball 150 and the outer ring 130 are spaced apart from each other except for the contact point P1, and there is a space in which lubricant can accumulate between the outer ring 130 and the ball 150. Therefore, the lubricating oil collected between the ball 150 and the outer ring 130 may cause overlubrication of the ball 150, and durability of the bearing 100 may be deteriorated due to the accumulation of lubricating oil containing foreign substances. The foreign substance may be mainly metal powder, and may cause damage to parts constituting the bearing 100 due to the foreign substance. According to an embodiment of the present invention, the lubricating oil collected between the second raceway surface 131 defined on the outer ring 130 and the balls 150 is circulated in the bearing 100, and the phenomenon in which the lubricating oil is concentrated in one place This can be prevented and the durability of the bearing 100 can be improved.

6 is a view showing a lubricating oil circulation structure of a bearing according to another embodiment of the present invention.

1, 4 and 6, the lubricating oil discharged from the first cavity 310 where the lubricating oil stays and the discharge holes 135 flow in order to supply the lubricating oil to the inlet 105 around the bearing 100. A second cavity 330 may be provided. The first cavity 310 may be located adjacent to the inlet 105 and may guide the lubricating oil supplied through the pump 200 to flow into the inlet 105 of the bearing 100 . Lubricating oil may be injected from the pump 200 through the first cavity inlet 315 of the first cavity 310 . The second cavity 330 may be positioned adjacent to the discharge holes 135 and may guide the lubricating oil discharged from the bearing 100 to flow into the flow path 80 . Lubricating oil may flow into the flow path 80 through the second cavity inlet 335 of the second cavity 330 . For example, the first cavity 310 and the second cavity 330 may be one component of the motor housing 20 , but may be separate components disposed within the motor housing 20 .

A cooling structure 400 for cooling the lubricating oil and a temperature sensor 90 for measuring the temperature of the lubricating oil may be provided on the oil passage 80 . The cooling structure 400 may be disposed between the bearing 100 and the pump 200 . The temperature sensor 90 may be located between the cooling structure 400 and the bearing 100, but the location may not be particularly limited. For example, the cooling structure 400 may include heat sinks disposed on an outer surface of the motor housing 20 surrounding the motor 10 . As another example, the cooling structure 400 is a part of the passage 80 through which the lubricating oil flows, and may mean a portion having a cross-sectional area where the passage 80 and air come into contact with each other compared to other parts of the passage 80 . The cooling structure 400 may cool the lubricating oil through heat exchange with air. However, a structure capable of directly cooling the lubricating oil may be employed as the cooling structure 400 .

The controller 500 may control the driving amount or driving cycle of the pump 200 in consideration of at least one of the speed of the vehicle, the rotational speed of the motor 10, and the temperature of the lubricating oil. The controller 500 may increase the driving amount of the pump 200 or shorten the driving cycle when the temperature of the lubricating oil is higher than the predetermined temperature. The preset temperature may be a numerical value that can be changed by a designer. Through this, the lubricating oil for cooling and lubricating the inside of the bearing 100 circulates at a high speed, so that the cooling and lubricating performance of the bearing 100 can be improved.

7 is a view showing a lubricating oil circulation structure of a bearing according to another embodiment of the present invention. For brevity of description, description of contents overlapping with those of FIG. 6 will be omitted.

Referring to FIGS. 1 and 7 , a filter 450 for removing foreign substances contained in lubricating oil may be provided on the oil passage 80 . Filter 450 may be disposed between bearing 100 and pump 200 . The lubricating oil discharged by the second cavity 330 affects the friction between the ball 150 and the cage 170, the ball 150 and the inner ring 110, or the ball 150 and the outer ring 130 inside the bearing 100. It may contain foreign substances caused by The lubricating oil from which foreign substances are removed by the filter 450 may flow into the first cavity inlet 315 of the first cavity 310 by the pump 200 .

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art can implement the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

Claims (12)

An inner ring in contact with a shaft of a motor mounted on a vehicle;
An outer ring in which a discharge hole for discharging lubricating oil is defined;
a plurality of balls disposed between the inner race and the outer race;
a cage supporting the balls; and
It is connected to the outer ring to seal the inner space defined by the inner ring and the outer ring, and includes two seals provided on one side and the other side of the outer ring, respectively, divided based on the direction in which the rotation axis of the outer ring extends,
One side of the outer ring is smaller in width than the other side in the direction from the inner ring to the outer ring,
The space between the seal connected to one side of the outer ring and the inner ring is an inlet through which lubricating oil is introduced,
A raceway surface into which the balls are inserted is defined on the outer ring,
A connection groove, which is a passage through which lubricating oil can flow, is defined on the raceway surface,
The connection groove serves to circulate the lubricating oil accumulated between the raceway surface and the balls in the bearing.
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
The seal includes a first seal connected to one side of the outer ring and a second seal connected to the other side of the outer ring,
The first seal and the second seal have the same structure,
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
The discharge hole is defined on the other side of the outer ring,
The inlet of the discharge hole is defined within a range of greater than 0 degrees to less than 20 degrees based on the contact point where the ball and the outer ring meet.
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
As the ball toward the edge of one side of the outer ring, the distance between the outer ring and the inner ring increases,
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
The discharge hole is defined on the raceway surface of the outer ring,
The discharge hole is formed so as not to overlap with the connection groove,
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
A plurality of discharge holes are defined on the outer surface of the outer ring,
In order to supply the lubricating oil to the inlet, a first cavity in which the lubricating oil stays and a second cavity in which the lubricating oil discharged from the discharge holes flows are provided.
Lubricating oil circulation structure of high-speed bearing. According to claim 1,
Further comprising a flow path through which the lubricating oil discharged from the discharge holes flows and a pump provided on the flow path,
The pump discharges lubricating oil from the bearing and supplies lubricating oil to the inlet.
Lubricating oil circulation structure of high-speed bearing. According to claim 7,
A filter for removing foreign substances contained in the lubricating oil is provided on the flow path,
The filter is disposed between the bearing and the pump,
Lubricating oil circulation structure of high-speed bearing. According to claim 7,
A cooling structure for cooling the lubricating oil is provided on the flow path,
The cooling structure is disposed between the bearing and the pump,
Lubricating oil circulation structure of high-speed bearing. According to claim 9,
The cooling structure includes heat sinks disposed on an outer surface of a motor housing surrounding the motor.
Lubricating oil circulation structure of high-speed bearing. According to claim 7,
Including a controller for controlling the pump,
The controller controls the driving amount or driving cycle of the pump in consideration of the speed of the vehicle or the rotational speed of the motor.
Lubricating oil circulation structure of high-speed bearing. According to claim 7,
Including a controller for controlling the pump,
A temperature sensor for measuring the temperature of the lubricating oil is provided in the passage,
The controller controls the driving amount or driving cycle of the pump according to the temperature of the lubricating oil.
Lubricating oil circulation structure of high-speed bearing.

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