Lubricant supply system
By designing brackets and oil guides on the motor, centrifugal force and wind force are used to store lubricant and distribute it to the reducer components, solving the problem of uneven lubrication in traditional systems, achieving efficient lubricant supply, and reducing the required specifications and size of the lubrication pump.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYUNDAI MOBIS CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-26
AI Technical Summary
The reducer of a traditional external rotor motor cannot be effectively lubricated, especially the needle roller bearing in the center part. Furthermore, existing forced lubrication methods have problems such as high pump specifications, large size, and uneven lubrication.
The design employs a bracket and oil guide, which is fixed to the motor housing via bracket bearings. It utilizes centrifugal force and wind force to store lubricant during high-speed rotation and disperse lubricant during low-speed rotation, forming a main flow path and a forced lubrication reduction flow path to ensure that lubricant is supplied to all components.
This technology enables smooth lubrication of needle roller bearings and bracket bearings even at high speeds, reducing the need for forced lubrication and lowering the required specifications and dimensions of the lubricant pump.
Smart Images
Figure CN224283410U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a lubricant supply system, and more specifically, to a lubricant supply system for a motor in a vehicle. Background Technology
[0002] Unlike traditional off-shaft rotors, gearboxes with on-shaft rotors (where the drive shaft is inserted into the center of the rotor shaft) cannot form an oil flow path in the center of the rotor. Therefore, oil must be supplied solely through rotation (agitation), which is insufficient to lubricate the various bearings within the gearbox. Consequently, the on-shaft rotor needs to form a separate oil lubrication path, unlike traditional methods, to forcibly supply oil to and lubricate the gearbox components. This necessitates higher specifications and larger dimensions for the oil supply pump.
[0003] More specifically, in the case of conventional mixing methods, the lubricant tends to remain only at the edges rather than inside the motor and reducer due to the centrifugal force and airflow caused by the rapidly rotating planetary gears. This results in the lubricant not being supplied to the bearings located in the center. Furthermore, even when a flow path for forced lubricant supply is formed in the motor rotor, there is still a problem where lubricant is supplied to some components but not to the needle roller bearings housed therein.
[0004] Related technical documents
[0005] [Patent Document 1] Korean Patent Publication No. 10-2024-0087229, published on December 12, 2022, entitled "Reducer for electric vehicle". Utility Model Content
[0006] This disclosure aims to solve the above-mentioned problems and provides a lubricant supply system including a carrier that secures a carrier bearing adjacent to the needle roller bearing to the motor housing, ensuring that lubricant flows along a path supplied to one surface of the carrier, and the lubricant supply system includes an oil guide that stores the supplied lubricant during high-speed rotation and supplies lubricant to other components during low-speed rotation. Thus, compared with conventional lubricant supply systems, forced lubrication can be minimized, and even at high-speed rotation, oil can be smoothly supplied to the needle roller bearing and the carrier bearing using the centrifugal force and airflow naturally generated from the rotor on the shaft.
[0007] To address the aforementioned problems, a lubricant supply system according to one embodiment of the present disclosure is mounted on a motor. The lubricant supply system includes: a bracket having an insertion hole formed at a central portion of the bracket, and a bracket bearing, as a component of the motor, is inserted into the insertion hole; an oil flow path inserted into the housing of the motor; and an oil guide coupled to the bracket and guiding the flow of lubricant, wherein the bracket has a surface facing the housing, and the oil flow path has an outlet configured to face a surface of the bracket, such that lubricant is sprayed onto the oil guide coupled to the bracket.
[0008] Additionally, the oil flow path includes: a main flow path connected to a pump supplying lubricant and formed to extend in the radial direction of the motor; and a forced lubrication reduction flow path formed to extend from the main flow path toward the one surface of the bracket.
[0009] Additionally, the oil guide is connected to one of the surfaces of the bracket, and the oil guide is connected at a location where lubricant is received from the forced lubrication reduction flow path.
[0010] Additionally, the oil guide includes: a fixing portion inserted into and connected to the bracket, and a perforated guide path for lubricant flow perforated at the center portion of the fixing portion; and an oil collection portion formed to extend from the fixing portion and collect lubricant when the motor rotates.
[0011] In addition, the guide flow path includes an inclined surface at the end of the oil collection section, the inclined surface being neither parallel to the axial nor radial direction of the motor.
[0012] Additionally, the bracket is connected to a pin in which an oil storage passage for storing lubricant is formed to extend along the axial direction of the motor, and the fixing part is inserted into the oil storage passage of the pin.
[0013] In addition, the oil guide is integrally formed with the pin.
[0014] Additionally, the pin includes an opening groove with a cross-sectional area larger than that of the oil storage flow path. The opening groove is formed at one end connected to the oil guide and communicates with the oil storage flow path.
[0015] Additionally, the oil collection section includes: a first extension, one end of which is connected to the end of the fixing section, and the first extension is formed to extend in the radial direction of the motor to contact the one surface of the bracket; a second extension, which is formed to extend from the first extension in the axial direction of the motor; and a third extension, which is formed to extend from the second extension and is formed to extend such that its end is located in the region forming the guide flow path.
[0016] In addition, the third extension is formed to extend at an angle so as not to be parallel to the axial and radial directions of the motor.
[0017] Additionally, the oil collection section includes: a fourth extension, one end of which is connected to the end of the fixing section and is formed to extend flatly in the radial direction of the motor to contact the one surface of the bracket; and a fifth extension, which is formed to extend from the fourth extension and is formed to extend such that its end is located in the region forming the guide flow path.
[0018] In addition, the fifth extension is formed to extend at an angle so as not to be parallel to the axial and radial directions of the motor. Attached Figure Description
[0019] Figure 1 This is a partial cross-sectional view showing the internal structure of a motor to which the lubricant supply system of this disclosure is applied.
[0020] Figure 2 This is a partial cross-sectional view showing the oil supply flow path of this disclosure.
[0021] Figure 3 This is a partial perspective view showing the oil supply flow path of this disclosure.
[0022] Figure 4 This is a perspective view showing the oil guide of this disclosure.
[0023] Figure 5 This is a partial cross-sectional view showing the connection relationship between the oil guide and the connecting part of this disclosure.
[0024] Figure 6 This is a partial top view showing the oil guide of this disclosure.
[0025] Figure 7 This is a partial top view illustrating one embodiment of the oil guide of this disclosure. Detailed Implementation
[0026] The technical spirit of this disclosure will be described in more detail below with reference to the accompanying drawings. Prior to this, the terms or words used in this specification should not be construed as limited to their ordinary or dictionary meaning, but should be interpreted as conforming to the meaning and concept of the technical concept of this disclosure, based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe his or her own disclosure.
[0027] In the following text, reference will be made to Figure 1 A brief description is given of the internal structure of a motor to which the lubricant supply system 1000 of this disclosure is applied.
[0028] The lubricant supply system 1000 disclosed herein can be mounted on a motor to supply lubricant to components of a reducer, and may include: a bracket 100 in which an insertion hole 120 is formed at a central portion, and a bracket bearing C, as a component of the motor, is inserted into the insertion hole 120; and an oil flow path 200 inserted into the motor housing H. Lubricant can be supplied from a pump to the interior and exterior of the motor housing H via the oil flow path 200, and the reducer of the motor can be forcibly lubricated via the oil flow path 200. The bracket 100 may have a surface facing the motor housing H, and the oil flow path 200 may have an outlet configured to face a surface of the bracket 100 such that lubricant is sprayed onto a surface of the bracket 100.
[0029] Additionally, the lubricant supply system 1000 of this disclosure may include a guide that is coupled to the bracket 100 and disperses the lubricant. When the motor rotates at high speed, the oil guide 300 can use centrifugal force to store some lubricant, and when the motor rotates at low speed, the oil guide 300 can use gravity to disperse the lubricant to the internal components of the reducer and multiple bearings (such as needle roller bearings N) located in the central part of the motor.
[0030] In this way, by delivering some oil for forced lubrication toward the bracket 100, storing the oil through the oil guide 300, and delivering the lubricant to the components of the reducer, all components can be lubricated even when not all components are entirely dependent on forced lubrication, and the flow rate required for forced lubrication can be minimized. Furthermore, even when the oil pump has lower specifications, each part of the reducer can be smoothly lubricated.
[0031] In the following text, reference will be made to Figure 2 and Figure 3 The oil flow path 200 of this disclosure will be described in more detail.
[0032] More specifically, such as Figure 2 and Figure 3As shown, the oil flow path 200 may include a main flow path 210 and a forced lubrication reducing flow path 220. More specifically, the main flow path 210 may be connected to a pump for supplying lubricant, is formed to extend radially along the motor, and may have at least one outlet through which lubricant is sprayed toward the edge of the motor. Lubricant can be forcibly injected through the main flow path 210, such that each part of the reducer can be forcibly lubricated.
[0033] Additionally, the forced lubrication reduction flow path 220 can be formed to extend from the main flow path 210 toward a surface of the bracket 100. The forced lubrication reduction flow path 220 can be formed to communicate in a straight line, and its end (i.e., outlet) can be formed to face the bracket 100. By including the forced lubrication reduction flow path 220, a portion of the lubricant can be delivered toward the bracket 100, and the lubricant can be delivered more efficiently to the components located at the central portion via the bracket 100. Therefore, even when the pump used to supply the lubricant is not supplying oil at a high flow rate, the lubricant can still be delivered to all components.
[0034] In the following text, reference will be made to Figures 4 to 7 The oil guide 300 of this disclosure will be described in more detail.
[0035] like Figure 4 As shown, the oil guide 300 may include a fixing portion 310 and an oil collecting portion 320. More specifically, the fixing portion 310 may be inserted into and connected to the bracket 100, a perforated guide path 311 for lubricant flow may be perforated at the center portion of the fixing portion 310, and the oil collecting portion 320 may be formed to extend from the fixing portion 310 and be formed as... The shape is designed to store lubricant while the motor is rotating.
[0036] In this case, such as Figure 5 As shown, the oil guide 300 can be attached to a surface of the bracket 100 and is positioned corresponding to the forced lubrication reduction flow path 220. Therefore, lubricant can be smoothly received from the forced lubrication reduction flow path 220. The distance between the fixing part 310 and the center of the motor can be the same as the distance between the forced lubrication reduction flow path 220 and the center of the motor within a predetermined error range.
[0037] In addition, such as Figure 5As shown, the bracket 100 can be connected to the pin 110, in which an oil reservoir 111 for storing lubricant is formed and extends along the axial direction of the motor. The oil guide 300 may have a fixing portion 310 inserted into the oil reservoir 111 of the pin 110. Therefore, lubricant collected by the oil guide 300 can be stored in the oil reservoir 111 of the pin 110. The oil reservoir 111 may have a groove shape with one end open and the other closed, contacting one surface of the bracket 100. Therefore, lubricant received from the forced lubrication reduction flow path 220 by the oil guide 300 can be easily received and stored therein. Additionally, the oil reservoir 111 may also have an opening groove 112, which has a larger flow cross-sectional area than the oil reservoir 111 and is formed at one end thereto. The opening groove 112 can function as a funnel and receive lubricant from the forced lubrication reduction flow path 220 more smoothly through the large opening area. At least a portion of the opening groove 112 can be closed by the oil collection section 320 of the oil guide 300.
[0038] In this configuration, the oil guide 300 and pin 110 can be manufactured and formed separately from the bracket 100, and then later joined to the bracket 100. Therefore, the lubricant supply system 1000 of this disclosure can be easily applied even without further processing of the bracket 100. For example, the oil guide 300 and pin 110 can be formed from the same material and integrally formed with each other. This increases the ease of assembling the lubricant supply system 1000 of this disclosure.
[0039] In addition, such as Figure 6 As shown, the oil collection section 320 preferably includes: a first extension 321, one end of which is connected to the end of the fixing section 310, and the first extension 321 is formed to extend in the radial direction of the motor to contact a surface of the bracket 100; a second extension 322, which extends from the first extension 321 in the axial direction of the motor; and a third extension 323, which extends from the second extension 322 and is formed to extend such that its end is located in the region forming the guide flow path 311. Therefore, oil can be collected and stored in the space surrounded by the first extension 321, the second extension 322, and the third extension 323.
[0040] In this configuration, the guide flow path 311 may include an inclined surface 312 at its end on the oil collection section 320 side. This inclined surface 312 is not parallel to the axial and radial directions of the motor. By including the inclined surface 312, a small amount of lubricant can be prevented from remaining at the end of the guide flow path 311 when unlubricated. Furthermore, lubricant can be sprayed onto the inclined surface 312 of the guide flow path 311 that is not covered by the third extension 323. The lubricant can be reflected from the inclined surface 312 and delivered to the pin 110 or the oil storage flow path 111 inside the oil collection section 320. Additionally, when the lubricant stored in the oil collection section 320 is delivered to the guide flow path 311 and the oil storage flow path 111, even when the first extension 321 and the guide flow path 311 are formed in directions perpendicular to each other, the lubricant can be delivered without loss through the inclined surface 312 because it is included in the middle.
[0041] Alternatively, in one embodiment of the oil collection unit 320, such as Figure 7 As shown, the oil collection section 320 preferably includes: a fourth extension 324, one end of which is connected to the end of the fixing section 310, and the fourth extension 324 is formed to extend flatly in the radial direction of the motor to contact a surface of the bracket 100; and a fifth extension 325, which is formed to extend from the fourth extension 324 and is formed to extend such that its end is located in the region forming the guide flow path 311. Unlike the rotor plate / oil distributor of the rotor, since the oil injection target point of the reducer is included in the bracket and rotates together, the fifth extension 325 of the oil collection section 320 can capture the oil dispersed by centrifugal force when oil is injected. In addition, even when the pin that serves as the oil injection target point contacts the inner surface of the fourth extension 324 of the oil collection section 320, oil can be evenly supplied to the three pins. In this case, the oil collection section 320 can be fixedly engaged in the opening slot 112.
[0042] Additionally, the third extension 323 or the fifth extension 325 can be formed to extend at an angle so as not to be parallel to the axial and radial directions of the motor. Therefore, the time that the lubricant remains on the wall surface of the third extension 323 or the fifth extension 325 can be increased, and the oil collection section 320 can store the lubricant more smoothly.
[0043] According to the above-described structure, the lubricant supply system of this disclosure, by including a bracket that fixes the bracket bearing adjacent to the needle roller bearing to the motor housing, ensures a flow path for supplying lubricant to one surface of the bracket, and includes an oil guide that stores the supplied lubricant during high-speed rotation and supplies lubricant to other parts during low-speed rotation, can minimize forced lubrication compared to conventional lubricant supply systems, and can smoothly supply oil to the needle roller bearing and the bracket bearing by utilizing the centrifugal force and wind force naturally generated from the rotor on the shaft even during high-speed rotation.
[0044] The technical spirit of this disclosure should not be construed as limited to the embodiments described above. Not only is the scope of application diverse, but various modifications can be made by those skilled in the art without departing from the spirit of this disclosure. Therefore, any improvements and changes that are obvious to those skilled in the art fall within the scope of this disclosure.
Claims
1. A lubricant supply system, wherein the lubricant supply system is mounted on a motor, characterized in that, The lubricant supply system includes: A bracket having an insertion hole formed at the center portion of the bracket, and in the bracket, a bracket bearing, as a component of the motor, is inserted into the insertion hole; An oil flow path, said oil flow path being inserted into the housing of the motor; and An oil guide, which is connected to the bracket and guides the flow of lubricant. The bracket has a surface facing the housing, and The oil flow path has an outlet, which is configured to face a surface of the bracket, such that lubricant is sprayed onto the oil guide connected to the bracket.
2. The lubricant supply system according to claim 1, characterized in that, The oil flow path includes: A main flow path, the main flow path being connected to a pump supplying lubricant and formed to extend radially along the motor; and Forced lubrication reduces the flow path, which is formed to extend from the main flow path toward one of the surfaces of the bracket.
3. The lubricant supply system according to claim 2, characterized in that, The oil guide is connected to one of the surfaces of the bracket, and The oil guide is connected at the location where it receives lubricant from the forced lubrication reduction path.
4. The lubricant supply system according to claim 1, characterized in that, The oil guide includes: A fixing part, which is inserted into and connected to the bracket, and a perforated guide path for lubricant flow is perforated at the center portion of the fixing part; and An oil collection section is formed to extend from the fixed section and collect lubricant when the motor rotates.
5. The lubricant supply system according to claim 4, characterized in that, The guide flow path includes an inclined surface at the end of the oil collection section, the inclined surface being neither parallel to the axial nor radial direction of the motor.
6. The lubricant supply system according to claim 4, characterized in that, The bracket is connected to a pin in which an oil reservoir for storing lubricant is formed to extend along the axial direction of the motor. The fixing part is inserted into the oil storage flow path of the pin.
7. The lubricant supply system according to claim 6, characterized in that, The oil guide is integrally formed with the pin.
8. The lubricant supply system according to claim 6, characterized in that, The pin includes an opening groove with a cross-sectional area larger than that of the oil storage flow path. The opening groove is formed at one end connected to the oil guide and communicates with the oil storage flow path.
9. The lubricant supply system according to claim 4, characterized in that, The oil collection unit includes: A first extension, one end of which is connected to the end of the fixing part, and the first extension is formed to extend in the radial direction of the motor to contact the one surface of the bracket; A second extension, the second extension being formed to extend from the first extension along the axial direction of the motor; and A third extension is formed to extend from the second extension, and the third extension is formed to extend such that its end is located in the region forming the guide flow path.
10. The lubricant supply system according to claim 9, characterized in that, The third extension is formed to extend at an angle so as not to be parallel to the axial and radial directions of the motor.
11. The lubricant supply system according to claim 4, characterized in that, The oil collection unit includes: A fourth extension, one end of which is connected to the end of the fixing part, and the fourth extension is formed to extend flatly in the radial direction of the motor to contact the one surface of the bracket; and A fifth extension is formed to extend from the fourth extension, and the fifth extension is formed to extend such that its end is located in the region forming the guide flow path.
12. The lubricant supply system according to claim 11, characterized in that, The fifth extension is formed to extend at an angle so as not to be parallel to the axial and radial directions of the motor.