Lubricant supply system

Abstract

Lubrication supply system mounted on an engine, comprising: a carrier having an insertion hole formed in its central portion into which a carrier bearing of the motor is inserted; an oil flow path inserted into a housing of the engine; and an oil distribution part that is coupled to the carrier and a shaft of the engine and distributes lubricant, wherein the oil flow path is formed to have at least one outlet facing the shaft side so that lubricant is sprayed onto the shaft of the motor.

Description

Background of RevelationArea of ​​Revelation

[0001] The present disclosure relates to a lubricant supply system, and more particularly to a lubricant supply system applied to an engine for a vehicle. Description of the state of the art

[0002] Unlike conventional off-axis rotors, a motor reducer with an axial rotor, in which a drive shaft is inserted into the center of a rotor shaft, cannot form an oil flow path in the center of the rotor. Therefore, it is necessary to supply oil only by rotation (swirling), and it is difficult to lubricate each bearing included in the reducer only by swirling. Accordingly, the axial rotor must form a separate oil lubrication path in a different form than conventional ones to forcibly supply oil to the components of the reducer and lubricate the components. Accordingly, problems arise because the requirements for an oil supply pump are higher and its dimensions are larger.

[0003] In particular, in the case of conventional swirl methods, since the lubricant remains only at one edge and not at the internal parts of the motor and reducer due to centrifugal force and wind force caused by a rapidly rotating planetary gear, a problem arises in that no lubricant is supplied to a bearing located in a central section. Even if a forced lubrication flow path is provided in the motor rotor, a problem arises in that the lubricant is only supplied to some parts and is not supplied to a needle bearing located therein. State of the art document

[0004] [Patent Document 1] Korean Patent Laid-Open No. 10-2024-0087229, entitled “Reducer for electric vehicle,” published on December 12, 2022. Summary of Revelation

[0005] The present disclosure has been made in an effort to solve the above-mentioned problems and aims to provide a lubricant supply system comprising a flow path along which lubricant is supplied to a shaft, an oil distributor coupled to the shaft, and a carrier that receives the oil distributed by the oil distributor and into which a pin is inserted that stores and supplies lubricant, thereby minimizing forced lubrication compared to conventional systems and enabling smooth oil supply to a needle bearing and a carrier bearing even at high speed by utilizing centrifugal force and wind force naturally generated by an axial rotor.

[0006] To solve the above problems, an engine-mounted lubricant supply system according to an embodiment of the present disclosure includes a carrier having an insertion hole formed in its central portion into which a carrier bearing of the engine is inserted, an oil flow path inserted into a housing of the engine, and an oil distribution part coupled to the carrier and a shaft of the engine and distributing lubricant, wherein the oil flow path is formed to have at least one outlet facing the shaft side so that lubricant is sprayed onto the shaft of the engine.

[0007] In addition, the oil flow path includes a main flow path connected to a pump that supplies lubricant and formed to extend in a radial direction of the motor, and a forced lubrication reducing flow path formed to extend from the main flow path toward the shaft of the motor.

[0008] In addition, the oil distribution part includes an oil distributor which is inserted between the insertion hole and the shaft of the motor and distributes the lubricant taken up from the flow path for reducing forced lubrication in the radial direction of the motor.

[0009] In addition, the oil distributor includes a fixed part in which a coupling hole into which the shaft of the motor is inserted is formed, and a spray part shaped to extend in the radial direction from the fixed part and to store and spray lubricant.

[0010] Furthermore, the spray part includes a first extension having one end connected to one end of the fixed part and formed to extend in the radial direction of the motor, a second extension formed to extend from the first extension in the axial direction of the motor, and a third extension formed to extend from the second extension in the radial direction of the motor.

[0011] In addition, the second extension has two or more spray holes formed in a circumferential direction.

[0012] Furthermore, the oil distribution part includes a pin which is inserted into the carrier in an axial direction of the engine and in which a flow path in which lubricant is stored is formed so as to extend in the axial direction of the engine.

[0013] Furthermore, the pin includes a first flow path in which lubricant is stored and which is formed to extend in the axial direction of the motor, and a second flow path formed in a direction perpendicular to the first flow path and which is formed to pass through the pin.

[0014] Furthermore, the first flow path comprises an open groove having one end contacting a surface of the carrier open and the other end closed, and having a larger flow cross-section thereof at one end than the first flow path.

[0015] Furthermore, the carrier includes a transfer flow path having one end communicating with the first flow path and formed to extend in the radial direction of the motor. Brief description of the drawings Fig. 1 is a partial cross-sectional view showing an internal structure of an engine to which a lubricant supply system of the present disclosure is applied. Fig. 2 is a partial cross-sectional view showing an oil supply flow path of the present disclosure. Fig. 3 is a partial cross-sectional view showing an oil distribution part of the present disclosure. Fig. 4 is a perspective view showing an oil distributor of the present disclosure. Fig. 5 is a perspective view showing a pen of the present disclosure. Fig. 6 is a partial cross-sectional view showing a transfer flow path of the present disclosure. Detailed description of the revelation

[0016] The technical idea of ​​the present disclosure will be explained in more detail below with reference to the accompanying drawings. Prior to that, the terms and words used in this description and the claims are not limited to their common or lexical meaning, but are to be understood as meanings and concepts that correspond to the technical idea of ​​the present disclosure based on the principle that the inventor can appropriately define the terms to best describe his or her own disclosure.

[0017] The following is based on reference to Fig. 1 briefly describes an internal structure of an engine to which a lubricant supply system 1000 of the present disclosure is applied.

[0018] The lubricant supply system 1000 of the present invention can be mounted on a motor to supply lubricant to parts of a reduction gear, and can include a carrier 100 having an insertion hole formed at a central portion, a carrier bearing, which is one of the parts of the motor and is inserted into the insertion hole, and an oil flow path 200 inserted into a housing of the motor. Lubricant can be supplied from a pump to the inside and outside of the housing of the motor via the oil flow path 200, and the reduction gear of the motor can be forcibly lubricated via the oil flow path 200. The oil flow path 200 can be configured to have at least one outlet facing the shaft side so that lubricant is sprayed onto the shaft of the motor.

[0019] Furthermore, the lubricant supply system 1000 of the present disclosure may include an oil distribution part 300 coupled to the carrier 100 and the shaft of the motor, and distributing lubricant. The oil distribution part 300 may receive lubricant from the oil flow path 200 using centrifugal force and wind force and distribute the lubricant to internal parts of the reduction gear and a plurality of bearings (a needle bearing, etc.) positioned at a central portion of the motor. The oil distribution part 300 may receive the lubricant distributed toward the shaft of the motor via the oil flow path 200 and distribute the lubricant to parts positioned at the central portion side.

[0020] In this way, by distributing forced lubrication oil toward the motor shaft, the lubricant can be evenly distributed to the parts of the reducer, such as the bearing located at its center section, by centrifugal force and wind force. Furthermore, it is possible to minimize the flow volume required for forced lubrication and evenly lubricate each part of the reducer, even if the required oil pump specifications are lower.

[0021] In the following, the oil flow path 200 of the present disclosure will be described with reference to Fig. 2 described in more detail.

[0022] More specifically, the oil flow path 200, as shown in Fig. 2, a main flow path 210 and a forced lubrication reduction flow path 220. In particular, the main flow path 210 may be connected to the pump for supplying lubricant, extend in a radial direction of the motor, and have at least one outlet through which the lubricant is sprayed toward an edge of the motor. The lubricant may be forcedly injected through the main flow path 210, so that each part of the reduction gear is forcedly lubricated.

[0023] Furthermore, the forced lubrication reducing flow path 220 may be formed to extend from the main flow path 210 toward the motor shaft. The forced lubrication reducing flow path 220 may be formed in a straight line, and one end, i.e., an outlet, may be formed to face the motor shaft. By including the forced lubrication reducing flow path 220, lubricant can be supplied to the motor shaft, i.e., the central portion of the motor, and the lubricant can be more efficiently supplied from the oil distribution part 300 to the parts positioned in the central portion. Accordingly, the lubricant can be supplied to all parts even when the lubricant supply pump does not supply oil at a high discharge rate.

[0024] In the following, the oil distribution part 300 of the present disclosure will be described with reference to the Fig. 3 to 6 are described in more detail.

[0025] As in Fig. As shown in Figure 3, the oil distribution part 300 can be applied to the carrier 100 to distribute lubricant. More specifically, the oil distribution part 300 can include an oil distributor 320 and a pin 310. The oil distributor 320 is a part that is inserted between the shaft of the motor and the insertion hole of the carrier 100 and can distribute the lubricant received from the oil flow path 200 in a radial direction to distribute the lubricant to the pin 310 or the carrier 100 and the needle bearing. The pin 310 can be inserted into the carrier 100 in an axial direction and can have a flow path in which lubricant is stored and that is formed to extend in the axial direction of the motor.

[0026] As in Fig. 4, the oil distributor 320 may further include a fixed part 321 in which a coupling hole into which the shaft of the motor is inserted is formed, and a spray part 322 formed to extend in the radial direction from the fixed part 321 and to store and spray lubricant. The spray part 322 may further include a first extension 322a, one end of which is connected to the fixed part 321 and formed to extend in the radial direction of the motor, and a second extension 322b formed to extend from the first extension 322a in the axial direction of the motor.

[0027] In one embodiment, the oil distributor 320 may further include a third extension 322d configured to extend from the second extension 322b in the radial direction of the engine. By including the third extension 322d, it is possible to increase the thickness of the second extension 322b against which the oil impinges, even when a flow rate of the lubricant is high at high rotational speed. Furthermore, by adjusting an extension length of the third extension 322d, the angle at which a lubricant is distributed between the third extension 322d and the fixed part 321 can be adjusted. The lubricant distributed between the third extension 322d and the fixed part 321 can be distributed toward the needle bearing or the carrier bearing.

[0028] The second extension 322b may include two or more spray holes 322c formed in a circumferential direction and radially distributing lubricant through the spray holes 322c. The spray holes 322c may generally be formed to be spaced apart from one another, but in order to selectively distribute the lubricant to a specific component, the spray holes 322c may be formed so that the lubricant collects on a side to which the lubricant is to be targeted. Alternatively, a larger diameter of the spray holes 322c may be formed on the side to which the lubricant is to be targeted. Alternatively, the spray holes 322c may also be correspondingly formed on the side facing a transfer flow path 110 described below.

[0029] More specifically, the pen 310, as shown in Fig. 5, a first flow path 311 in which lubricant is stored and which is formed to extend in the axial direction of the motor, and a second flow path 312 which is formed in a direction perpendicular to the first flow path 311 and which is formed to pass through the pin 310. The second flow path 312 may be formed to run in the direction perpendicular to the first flow path 311, and the second flow path 312 may be formed to pass through the pin 310 in the radial direction of the motor. The second flow path 312 may be formed to pass through the entire pin 310, or may be formed such that an interior of the first flow path 311 communicates only with one or the other side of the pin 310.Furthermore, the second flow paths 312 formed on one and the other side of the pin 310 may be formed so as to be spaced apart from each other by a predetermined distance in the axial direction of the motor, that is, not aligned with each other.

[0030] The shapes of the first flow path 311 and the second flow path 312 are not limited to those shown in the drawing and can be easily changed and applied by the user depending on the physical properties of the lubricant or the positions of parts of the reduction gear (position where lubricant is supplied). One end of the first flow path 311 can be arranged to face the outlet of the forced lubrication reducing flow path 220, and thus the first flow path 311 can receive and store lubricant from the forced lubrication reducing flow path 220, and the second flow path 312 can receive the stored lubricant from the first flow path 311 and supply the lubricant to each part of the reduction gear.

[0031] The first flow path 311 may be in the form of a groove, with one end that comes into contact with a surface of the carrier 100 being open and the other end being closed. Accordingly, the lubricant received from the forced lubrication reducing flow path 220 can be easily received and stored therein. Furthermore, the first flow path 311 may further include an open groove 313 that has a larger flow area than the first flow path 311 and is formed at one end thereof. The open groove 313 may act as a funnel and better receive the lubricant from the forced lubrication reducing flow path 220 due to the large opening area. Furthermore, the pin 310 may have a transfer hole 314 that communicates with the first flow path 311, the open groove 313, the oil distributor 320, and the transfer flow path 110.Lubricant can be transferred from the oil distributor 320 through the transfer hole 314 into the interior of the pin 310.

[0032] As in Fig.6, the carrier 100 may further include the transfer flow path 110, one end of which is connected to the first flow path 311 and which is formed to extend in the radial direction of the engine. For example, the carrier 100 may have one end that communicates with the transfer hole 314 and the open groove 313. As described above, the transfer flow path 110 may receive lubricant from the spray holes 322c of the oil distributor 320. The lubricant preferably flows due to centrifugal force when the engine rotates. More specifically, the lubricant may be sequentially passed through the spray hole 322c of the oil distributor 320, the transfer flow path 110, the transfer hole 314, and the first flow path 311 by means of centrifugal force.Accordingly, the lubricant sprayed from the forced lubrication reducing flow path 220 when the motor rotates can be transferred to the inner parts of the reduction gear only by the centrifugal force and the wind force without separate pumping.

[0033] According to the lubricant supply system of the present disclosure having the above-described configuration, by including the flow path along which the lubricant is supplied to the shaft, the oil distributor coupled to the shaft, and the carrier that receives oil distributed by the oil distributor, and by inserting the pin that stores and supplies lubricant into the carrier, it is possible to minimize forced lubrication compared to conventional systems and enable smooth oil supply to a needle bearing and a carrier bearing even at high speed by utilizing centrifugal force and wind force naturally generated by an axial rotor.

[0034] The technical concept of the present disclosure is not limited to the embodiments described above. The scope of application is diverse, and those skilled in the art may also make various modifications without departing from the gist of the present disclosure as defined in the claims. Therefore, these improvements and modifications fall within the scope of the present disclosure, provided they are obvious to those skilled in the art. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0087229

[0004]

Claims

[1] A lubricant supply system mounted on an engine, comprising: a carrier having an insertion hole formed in its central portion into which a carrier bearing of the motor is inserted; an oil flow path inserted into a housing of the engine; and an oil distribution part that is coupled to the carrier and a shaft of the engine and distributes lubricant, wherein the oil flow path is formed to have at least one outlet facing the shaft side so that lubricant is sprayed onto the shaft of the motor. [2] A lubricant supply system according to claim 1, wherein the oil flow path comprises: a main flow path connected to a pump that supplies lubricant and formed to extend in a radial direction of the motor; and a forced lubrication reduction flow path formed to extend from the main flow path toward the motor shaft. [3] The lubricant supply system according to claim 2, wherein the oil distribution part comprises an oil distributor which is inserted between the insertion hole and the shaft of the motor and distributes the lubricant received from the forced lubrication reducing flow path in the radial direction of the motor. [4] Lubricant supply system according to claim 3, wherein the oil distributor comprises: a fixed part in which a coupling hole into which the shaft of the motor is inserted is formed; and a spray part formed to extend in the radial direction from the fixed part and to store and spray lubricant. [5] Lubricant supply system according to claim 4, wherein the spray part comprises: a first extension having one end connected to one end of the fixed part and formed to extend in the radial direction of the motor; a second extension configured to extend from the first extension in the axial direction of the motor; and a third extension configured to extend from the second extension in the radial direction of the motor. [6] The lubricant supply system according to claim 5, wherein the second extension has two or more spray holes formed in a circumferential direction of the oil distributor. [7] A lubricant supply system according to any one of claims 3 to 6, wherein the oil distribution part comprises a pin which is inserted into the carrier in an axial direction of the engine and in which a flow path in which lubricant is stored is formed to extend in the axial direction of the engine. [8] A lubricant supply system according to claim 7, wherein the pin comprises: a first flow path in which lubricant is stored and which is formed to extend in the axial direction of the motor; and a second flow path formed in a direction perpendicular to the first flow path and configured to pass through the pin. [9] A lubricant supply system according to claim 8, wherein the first flow path comprises an open groove having one end contacting a surface of the carrier open and the other end closed, and having a larger flow area at one end thereof than the first flow path. [10] A lubricant supply system according to claim 8 or 9, wherein the carrier comprises a transfer flow path having one end communicating with the first flow path and being formed to extend in the radial direction of the engine.

Images