Rotor shaft and motor assembly

Abstract

The present application provides a rotor shaft and a motor assembly. The rotor shaft comprises the following: a first housing mounting section configured to be mounted on a first end cover of a motor assembly; a second housing mounting section configured to be mounted on a second end cover of the motor assembly; a first chamber extending axially from the first housing mounting section to the second housing mounting section; at least one first opening arranged on the first housing mounting section, which brings the first chamber into communication with the external environment of the rotor shaft; and at least one second opening arranged on the second housing mounting section, which brings the first chamber into communication with the external environment of the rotor shaft.One or more spiral grooves are provided on the inner wall of the first chamber, with the spiral grooves extending from the first opening to the second opening. Furthermore, the second opening is designed such that it extends along a first axis in a radial section of the rotor shaft, forming a first predetermined angle between the first axis and a radial direction.

Description

Technical field

[0001] The present application relates to the field of motor structures. In particular, the present application relates to a rotor shaft designed for improved cooling performance. Furthermore, the present application relates to a motor arrangement comprising the aforementioned rotor shaft. State of the art

[0002] During motor operation, power losses, such as copper and iron losses, are converted into heat. If the motor's heat dissipation is insufficient, this heat can accumulate inside the motor over time, leading to overheating and motor failure. Therefore, improving heat dissipation is a key factor in the design of high-energy-density motors. Various motor designs have been proposed to effectively dissipate heat from the motor's interior and cool the motor itself. Typically, grease lubrication is used for bearings at both ends of a motor shaft, resulting in poor heat dissipation. The grease can easily overheat and fail, leading to insufficient lubrication of the bearings and eventual failure.Therefore, there is a continuing need in this area for solutions regarding heat dissipation from engines. Disclosure of the utility model

[0003] In a first aspect, the object of the present application is to provide a rotor shaft that enables improved cooling performance and guides a cooling fluid through a motor assembly. In a further aspect, the object of the present application is to provide a motor assembly that includes the aforementioned rotor shaft.

[0004] The task of the present application is solved by the following technical solution.

[0005] A rotor shaft is provided, which includes the following: a first housing assembly section designed to be mounted on a first end cover of a motor assembly; a second housing mounting section designed to be mounted on a second end cover of the motor assembly; a first chamber extending from the first housing assembly section in an axial direction to the second housing assembly section; at least one first opening located on the first housing assembly section, which brings the first chamber into communication with the external environment of the rotor shaft; and at least a second opening located on the second housing assembly section, which brings the first chamber into communication with the external environment of the rotor shaft, wherein one or more spiral grooves are provided on an inner wall of the first chamber, the spiral grooves extending from the first opening to the second opening, and wherein the second opening is designed such that it extends in a radial section of the rotor shaft in a first axis, forming a first predetermined angle between the first axis and a radial direction.

[0006] The rotor shaft described above optionally provides that the first opening is designed to extend in the axial direction.

[0007] The rotor shaft described above optionally provides for several second openings in the radial section to be distributed evenly or unevenly around the first chamber, with at least some of the several second openings communicating with the spiral grooves.

[0008] The rotor shaft described above optionally allows the first predetermined angle to be set between 30 and 60 degrees.

[0009] The rotor shaft described above optionally features several spiral grooves spaced apart from each other on the inner wall of the first chamber, with the spiral grooves being recessed relative to the inner wall of the first chamber towards the outer surface of the rotor shaft.

[0010] The motor arrangement provided includes the following: a rotor designed to extend in an axial direction; a rotor shaft, wherein the rotor is arranged around the rotor shaft; a stator arranged on the outer circumference of the rotor; a housing that accommodates the stator and the rotor, with the stator being attached to the housing; a first end cover attached to the housing, wherein the first housing mounting section of the rotor shaft is rotatably attached to the front end cover; and a second end cover attached to the housing, wherein the second housing mounting section of the rotor shaft is rotatably attached to the rear end cover.

[0011] In the above engine arrangement, it is optionally provided that it includes a first oil seal and a first bearing, wherein the first oil seal and the first bearing are arranged between the outer circumference of the first housing assembly section and the first end cover, wherein the first oil seal, the first housing assembly section and the first end cover together enclose a second chamber, wherein the first bearing is located in the second chamber, wherein the first opening communicates with the first chamber, wherein the first end cover includes an inlet opening for a coolant, and wherein the inlet opening communicates with the first chamber.

[0012] The above engine arrangement optionally includes a second oil seal and a second bearing, wherein the second oil seal and the second bearing are located between the outer circumference of the second housing assembly section and the second end cover, wherein the second oil seal, the second housing assembly section and the second end cover together enclose a third chamber, wherein the second bearing is located in the second chamber, wherein the second opening communicates with the third chamber, wherein the second end cover includes an outlet opening for a coolant, and wherein the outlet opening communicates with the third chamber.

[0013] The above engine arrangement optionally includes a third oil seal, wherein the third oil seal is arranged between the outer circumference of the second housing assembly section and the second end cover, wherein the second bearing is arranged between the second oil seal and the third oil seal, wherein the second end cover includes an annular projection, and wherein the projection is arranged between the second bearing and the third oil seal.

[0014] In the above engine arrangement, it is optionally provided that the outlet opening comprises a first section extending in a radial direction and a second section extending in the axial direction, the first section communicating with the second chamber and the second section communicating with the first section, the first and second sections each extending on a radial plane over a second predetermined angle on the inner wall of the second end cover, such that the outlet opening forms part of an annular shape, and the second predetermined angle being set between 30 and 120 degrees. Brief description of the characters

[0015] The application is described in more detail below in connection with the drawings and preferred embodiments. It should be clear to those skilled in the art that the figures are shown solely for the purpose of illustrating the preferred embodiments and are not intended to limit the scope of the application. Unless otherwise indicated, the composition or structure of the objects shown in the figures is only symbolized conceptually, possibly with exaggerated representations. The figures are also not necessarily drawn to scale. Fig. Figure 1 shows a perspective view of an embodiment of a rotor shaft according to the present application; Fig. Figure 2 shows an axial sectional view of the embodiment from Fig. 1; Fig. Figure 3 shows a radial sectional view of the embodiment. Fig. 1 at the position according to the in Fig. 2 shown line BB; Fig. Figure 4 shows a perspective view of an embodiment of a motor arrangement according to the present application; Fig. 5 shows a main view of the embodiment from Fig. 4; and Fig. Figure 6 shows a perspective view of a second end cover of the motor assembly according to the present application. Detailed descriptions

[0016] The preferred embodiments of the application are described in more detail below with reference to the figures. It should be clear to those skilled in the art that this description is merely descriptive and exemplary, and should not be interpreted as limiting the scope of protection of the application.

[0017] First, it should be noted that the positional terms mentioned herein, such as above, below, upwards, downwards, are defined in relation to the respective direction of the individual pieces. These positions are relative and therefore can change depending on the layout and state of the pieces. For this reason, these or other positional terms should not be understood as restrictive.

[0018] Furthermore, it should be noted that each individual technical feature (or equivalents thereof) expressly or implicitly described in the embodiments herein or expressly or implicitly illustrated in the figures can be further combined to obtain other embodiments not directly mentioned herein.

[0019] It should be noted that in different figures the same reference symbols stand for the same or essentially the same components.

[0020] The axial direction AA herein denotes the direction in which the axis of extension or axis of symmetry of the rotor shaft 11 extends. The radial direction RR herein denotes the direction of a ray emanating from a point on the axis of extension or axis of symmetry of the rotor shaft 11 and proceeding in a plane perpendicular to the axial direction AA.

[0021] In Fig. 1, Fig. 2 to Fig. Figure 3 shows various aspects of an embodiment of the rotor shaft 11 according to the present application. The rotor shaft 11 can be a tubular structure extending substantially in an axial direction AA. The rotor shaft 11 can comprise at least a first housing mounting section 110 and a second housing mounting section 120. The first housing mounting section 110 and the second housing mounting section 120 can each be configured to be mounted on a first end cap 40 and a second end cap 50 of a motor assembly 1, respectively, as shown in more detail in the following figures. It is understood that the rotor shaft 11 can further comprise additional sections, for example, an extension section located between the first housing mounting section 110 and the second housing mounting section 120, or an alternative mounting section extending from the second housing mounting section 120.

[0022] As in Fig. As shown in Figure 2, a first chamber 101 can be formed inside the rotor shaft 11. The first chamber 101 can be configured as a blind hole and extend from one end of the rotor shaft 11 into the interior of the rotor shaft 11. At the other end of the rotor shaft 11, a fourth chamber 104 can be formed, with a wall 103 being provided between the first chamber 101 and the fourth chamber 104 for separation. In one embodiment, the first chamber 101 can be substantially cylindrical and has an inner wall. The first chamber 101 can extend from the first housing assembly section 110 to the second housing assembly section 120 and can extend substantially in the axial direction AA.

[0023] The rotor shaft 11 can comprise at least one first opening 111 and at least one second opening 121. The first opening 111 can be located on the first housing mounting section 110 and communicates with the first chamber 101. The second opening 121 can be located on the second housing mounting section 120 and communicates with the first chamber 101. In one embodiment, the first opening 111 can be located at an axial end of the rotor shaft 11 and open in the axial direction AA. In another embodiment, several second openings 121 can extend from the inner wall of the first chamber 101 to the outer circumference of the rotor shaft 11. As described in Fig. As shown in Figure 3, the second openings 121 can extend in a radial section of the rotor shaft 11 and can extend in a first axis A1-A1. In one embodiment, a first predetermined angle B1 can be formed between the first axis A1-A1 and a radial direction RR. The first predetermined angle B1 can be between 30 and 60 degrees, for example 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, or 60 degrees, etc.

[0024] The rotor shaft 11 can include one or more spiral grooves 113. The spiral grooves 113 can be arranged on the inner wall of the chamber 101 and can be recessed from the inner wall of the first chamber 101 to the outer surface of the rotor shaft 11. Several spiral grooves 113 can be arranged on the inner wall of the first chamber 101, and these spiral grooves 113 can be spaced apart from one another. One end of the spiral groove 113 can be located at the first opening 111 and communicate with the first opening 111, and the other end of the spiral groove 113 can communicate with one of the several second openings 121. As in Fig. As shown in Figure 3, six second openings 121 can be arranged evenly around the first chamber 101, and four spiral grooves 113 can be arranged to communicate with four of the six second openings 121. As shown in Fig. As shown in Figure 2, the second opening 121 can be located at the end of the spiral groove 113. In an exemplary embodiment, the second openings 121 and the spiral grooves 113 can also be arranged in other configurations. For example, several second openings 121 can be arranged unevenly around the circumference of the rotor shaft 11, and the number of second openings 121 and spiral grooves 113 can be the same as or differ from the number shown in Figure 2. Fig. 3. The illustrated embodiment differs.

[0025] In Fig. 4, Fig. 5 to Fig. Figure 6 shows various aspects of an embodiment of the motor arrangement 1 according to the present application. The motor arrangement 1 can comprise: a rotor 10, a stator 20, a housing 30, a first end cap 40, and a second end cap 50, etc. The rotor 10 can be mounted on the rotor shaft 11 described above, and the rotor shaft 11 can be rotatably mounted on the first end cap 40 and the second end cap 50, such that the first housing mounting section 110 and the second housing mounting section 120 are adapted to the first end cap 40 and the second end cap 50, respectively. The stator 20 can be attached to the housing 30, and the housing 30 can be positioned between the first end cap 40 and the second end cap 50, such that the stator 20 is positioned close to the rotor 10.

[0026] The motor assembly 1 can further comprise a first oil seal 61. The first oil seal 61 can be arranged between the first end cover 40 and the outer surface of the first housing assembly section 110, such that the first oil seal 61, the first end cover 40, and the first housing assembly section 110 together enclose a second chamber 82. The first opening 111 of the rotor shaft 11 can communicate with the second chamber 82, and the first end cover 40 can comprise an inlet opening 41, the inlet opening 41 communicating with the second chamber 82. As shown in Fig. As shown in Figure 5, the inlet opening 41 can be arranged in the axial direction AA and faces the second chamber 82 and the first opening 111. A first bearing 71 can be arranged in the second chamber 82, for example, mounted on the outer surface of the first housing assembly section 110 and located between the outer surface of the first housing assembly section 110 and the first end cover 40. A cooling fluid or working fluid can flow through the inlet opening 41 into the second chamber 82 to reach the first opening 111 and the first chamber 101. Simultaneously, the cooling fluid or working fluid can lubricate and cool the first bearing 71 in the second chamber 82.

[0027] The motor assembly 1 can further comprise a second oil seal 62 and a third oil seal 63. The second oil seal 62 and the third oil seal 63 can be arranged between the second end cover 50 and the outer surface of the second housing assembly section 120, such that the second oil seal 62, the third oil seal 63, the second end cover 50, and the second housing assembly section 120 together enclose a third chamber 83. The second opening 121 of the rotor shaft 11 can communicate with the third chamber 83. A second bearing 72 can be arranged in the third chamber 83, for example, mounted on the outer surface of the second housing assembly section 120 and located between the outer surface of the second housing assembly section 120 and the second end cover 50. In one embodiment, the second bearing 72 can be positioned between the second oil seal 62 and the third oil seal 63.In one embodiment, the second end cover 50 can include an annular projection 52, wherein the projection 52 can be arranged between the second bearing 72 and the third oil seal 63 to space the second bearing 72 and the third oil seal 63 apart. In another embodiment, the rotor shaft 11 can be attached to a gearbox (not shown) on the side of the second end cover 50. In this case, the gearbox can replace the third oil seal 63 and assume the position shown in [reference missing]. Fig. 4, Fig. 5 to Fig. 6 is occupied by the third oil seal 63. The second bearing 72 can be arranged between the gearbox housing and the second oil seal 62.

[0028] The second end cap 50 may have an outlet opening 51 for a working fluid. The outlet opening 51 may face the third chamber 83. The outlet opening 51 may comprise a first section 51a extending in the radial direction RR and a second section 51b extending in the axial direction AA. The first section 51a may communicate directly with the second chamber 82, and the second section 51b may communicate with the first section 51a. The first section 51a and the second section 51b may each extend over a second predetermined angle on the inner wall of the second end cap 50, such that the outlet opening 51 forms part of an annular shape. This second predetermined angle may be set between 30 and 120 degrees.For example, it is 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees, or 120 degrees, etc. In the... Fig. In the embodiment shown in Figure 6, the first section 51a of the outlet opening 51 and the projection 52 of the second end cover 50 can be located in essentially the same radial section. The third chamber 83 can be in communication with the outlet opening 51, and the outlet opening 51 can be arranged on the outer circumference of the third chamber 83.

[0029] During operation, the working fluid can flow in through the inlet opening 41 of the first end cover 40 and through the second chamber 82 reach the first bearing 71 and the first opening 111 of the rotor shaft 11, and then enter the first chamber 101. As the rotor shaft 11 rotates, the working fluid can advance spirally within the first chamber 101 along one or more spiral grooves 113 in the axial direction AA and reach the second opening 121 of the rotor shaft 11. The working fluid then exits the rotor shaft 11 through the second opening 121 and enters the third chamber 83. In the third chamber 83, the working fluid passes the second bearing 72 and then enters the first section 51a and the second section 51b of the outlet opening 51 on the second end cover 50, before finally exiting the outlet opening 51.It is understood that the engine arrangement according to the present application may further comprise a circulation circuit, not shown in the figures, to convey the working fluid from the outlet port 51 back to the inlet port 41, thereby establishing a complete working fluid or oil circuit. In this way, the working fluid can circulate within the engine arrangement to dissipate heat and / or provide lubrication.

[0030] In one embodiment of the present application, lubricating oil can be used as a coolant. The lubricating oil flows through chambers at both ends of the respective end caps into a bearing seat to provide lubrication and cooling to the respective bearings.

[0031] The rotor shaft and motor assembly according to the present application offer advantages such as simplicity, reliability, ease of implementation, and user-friendliness. They can effectively dissipate the heat generated during operation of the motor assembly through the working fluid, thus reducing the temperature of the motor assembly and increasing its reliability.

[0032] The application was disclosed by the description relating to the figures, so that a person skilled in the art can implement the application by manufacturing and using any device or system, selecting suitable materials, and using any combinable method. The scope of the application is defined by the claimed technical solutions and includes other examples conceivable by a person skilled in the art. Insofar as such other examples do not include components that differ from the described claimed embodiment, or if such other examples include equivalent components that do not fundamentally differ from the described claimed embodiment, such examples shall be covered by the scope of protection defined by the claimed embodiment of the present application.

Claims

[1] Rotor shaft, characterized by that it includes the following: a first housing assembly section (110) designed to be mounted on a first end cover (40) of a motor assembly (1); a second housing assembly section (120) designed to be mounted on a second end cover (50) of the motor assembly (1); a first chamber (101) extending from the first housing assembly section (110) in an axial direction (AA) to the second housing assembly section (120); at least one first opening (111) arranged on the first housing assembly section (110) and bringing the first chamber (101) into communication with the external environment of the rotor shaft (11); and at least a second opening (121) arranged on the second housing assembly section (120) which brings the first chamber (101) into communication with the external environment of the rotor shaft (11), wherein one or more spiral grooves (113) are provided on the inner wall of the first chamber (101), the spiral grooves (113) extending from the first opening (111) to the second opening (121), and wherein the second opening (121) is designed such that it extends in a radial section of the rotor shaft (11) in a first axis (A1-A1), wherein a first predetermined angle (B1) is formed between the first axis (A1-A1) and a radial direction (RR). [2] Rotor shaft according to claim 1, characterized by , that the first opening (111) is designed such that it extends in the axial direction (AA). [3] Rotor shaft according to claim 1, characterized by , that several second openings (121) in the radial section are distributed evenly or unevenly around the first chamber (101), wherein at least some of the several second openings (121) are in communication with the spiral grooves (113). [4] Rotor shaft according to claim 1, characterized by , that the first predetermined angle (B1) is set between 30 and 60 degrees. [5] Rotor shaft according to any one of claims 1 to 4, characterized by , that several spiral grooves (113) are provided spaced apart from each other on the inner wall of the first chamber (101), wherein the spiral grooves (113) are recessed relative to the inner wall of the first chamber (101) towards the outer surface of the rotor shaft (11). [6] Engine arrangement, characterized by that it includes the following: a rotor (10) designed to extend in an axial direction (AA); a rotor shaft (11) according to one of claims 1 to 5, wherein the rotor (10) is arranged around the rotor shaft (11); a stator (20) which is arranged on the outer circumference of the rotor (10); a housing (30) that accommodates the stator (20) and the rotor (10), wherein the stator (20) is attached to the housing (30); a first end cover (40) attached to the housing (30), wherein the first housing mounting section (110) of the rotor shaft (11) is rotatably attached to the front end cover (40); and a second end cover (50) attached to the housing (30), wherein the second housing mounting section (120) of the rotor shaft (11) is rotatably attached to the rear end cover (50). [7] Motor arrangement according to claim 6, characterized by, that it comprises a first oil seal (61) and a first bearing (71), wherein the first oil seal (61) and the first bearing (71) are arranged between the outer circumference of the first housing assembly section (110) and the first end cover (40), wherein the first oil seal (61), the first housing assembly section (110) and the first end cover (40) together enclose a second chamber (82), wherein the first bearing (71) is located in the second chamber (82), wherein the first opening (111) communicates with the first chamber (71), wherein the first end cover (40) comprises an inlet opening (41) for a coolant, and wherein the inlet opening (41) communicates with the first chamber (71). [8] Motor arrangement according to claim 6, characterized by, that it comprises a second oil seal (62) and a second bearing (72), wherein the second oil seal (62) and the second bearing (72) are arranged between the outer circumference of the second housing assembly section (120) and the second end cover (50), wherein the second oil seal (62), the second housing assembly section (120) and the second end cover (50) together enclose a third chamber (83), wherein the second bearing (72) is located in the second chamber (82), wherein the second opening (222) communicates with the third chamber (83), wherein the second end cover (50) comprises an outlet opening (51) for a coolant, and wherein the outlet opening (51) communicates with the third chamber (83). [9] Motor arrangement according to claim 8, characterized by, that it further comprises a third oil seal (63), wherein the third oil seal (63) is arranged between the outer circumference of the second housing assembly section (120) and the second end cover (40), wherein the second bearing (72) is arranged between the second oil seal (62) and the third oil seal (63), wherein the second end cover (50) comprises an annular projection (52), and wherein the projection (52) is arranged between the second bearing (72) and the third oil seal (63). [10] Motor arrangement according to claim 8 or 9, characterized by, that the outlet opening (51) comprises a first section (51a) extending in a radial direction (RR) and a second section (51b) extending in the axial direction (AA), wherein the first section (51a) communicates with the second chamber (82) and the second section (51b) communicates with the first section (51a), wherein the first section (51a) and the second section (51b) each extend on a radial plane over a second predetermined angle on the inner wall of the second end cover (50), such that the outlet opening (51) forms part of an annular shape, and wherein the second predetermined angle is set between 30 and 120 degrees.

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