Motor rotor shaft, production method of motor rotor shaft and motor

Abstract

The invention provides a motor rotor shaft, a production method of the motor rotor shaft and a motor, and the motor rotor shaft comprises a rotor shaft main body which is cylindrical; the end shaft is welded at one axial end of the rotor shaft main body, so that the axial end of the rotor shaft main body is closed; the oil pipe is arranged in the rotor shaft main body; the oil pipe mounting piece is annular and sleeves the other axial end of the oil pipe, the oil pipe is connected to the rotor shaft main body through the oil pipe mounting piece, the oil pipe mounting piece is provided with a lip part, the lip part is located on the radial inner side of a main body of the oil pipe mounting piece, and the lip part is located on the radial outer side of the oil pipe when the lip part is not deformed; the oil pipe is inserted into the rotor shaft main body through the oil pipe mounting member, and in a state where the lip part is deformed, the lip part is bent inward in the radial direction and is at least partially positioned on the other side of the oil pipe in the axial direction, thereby restricting the movement of the oil pipe in the axial direction of the rotor shaft main body.

Description

Technical Field

[0001] The present application relates to a motor rotor shaft, a production method of a motor rotor shaft and a motor. Background Art

[0002] like Figures 1 to 3 As shown, a possible motor rotor shaft includes a rotor shaft body 1, an oil pipe 2, an end shaft 3 and an oil pipe mounting member 4. Figure 3 In step S1 to step S3, the oil pipe 2 is connected to the oil pipe mounting member 4 by welding, and then installed into the interior of the rotor shaft body 1. Then, the end shaft 3, the oil pipe 2, and the rotor shaft body 1 are matched and installed, and the end shaft 3 and the rotor shaft body 1 are welded and connected. After the oil pipe 2 is installed in the interior of the rotor shaft body 1, the cavity between the oil pipe 2 and the rotor shaft body 1 can only be cleaned through the through hole with a smaller aperture on the oil pipe 2 or the rotor shaft body 1, which is difficult to clean. Summary of the invention

[0003] The present application aims to provide a motor rotor shaft and a method for producing the motor rotor shaft, wherein the cavity between the oil pipe and the rotor shaft body can be easily cleaned. The present application also provides a motor including the motor rotor shaft.

[0004] The embodiment of the present application provides a motor rotor shaft, which includes:

[0005] A rotor shaft body, wherein the rotor shaft body is cylindrical;

[0006] An end shaft, the end shaft being welded to one axial end of the rotor shaft body so as to close the one axial end of the rotor shaft body;

[0007] an oil pipe disposed inside the rotor shaft body; and

[0008] The oil pipe mounting member is annular and sleeved on the other axial end of the oil pipe. The oil pipe is connected to the rotor shaft body through the oil pipe mounting member. The oil pipe mounting member is provided with a lip portion, which is located radially inward of the body of the oil pipe mounting member.

[0009] When the lip is not deformed, the lip is located radially outside the oil pipe, so that the oil pipe passes through the oil pipe mounting member and is installed in the rotor shaft body.

[0010] When the lip is deformed, the lip is bent radially inward, and the lip is at least partially located on the other axial side of the oil pipe, thereby limiting the axial movement of the oil pipe along the rotor shaft body.

[0011] In at least one possible embodiment, the end shaft is provided with an oil pipe mounting hole, the oil pipe is inserted into the oil pipe mounting hole and abuts against the bottom of the oil pipe mounting hole, one axial end of the oil pipe is supported and fixed by the end shaft, and the other axial end of the oil pipe is supported and fixed by the oil pipe mounting member.

[0012] In at least one possible embodiment, a step portion is provided on the inner periphery of the rotor shaft body, the step portion includes an end face and a peripheral surface, the end face faces the oil pipe mounting member, the oil pipe mounting member abuts against the end face of the step portion and is press-fitted with the peripheral surface of the step portion.

[0013] In at least one possible embodiment, when the lip is not deformed, the lip protrudes from the main body of the oil pipe mounting component along the axial direction of the oil pipe mounting component, and when the lip is deformed, the lip bends and extends radially inward.

[0014] In at least one possible embodiment, a groove is provided at a transition portion between the lip portion and the main body of the oil pipe mounting member, and the groove is located at an outer peripheral side of a base end of the lip portion.

[0015] In at least one possible implementation, the wall of the rotor shaft body is provided with two groups of oil outlet holes, the wall of the oil pipe is provided with a through hole, and the two groups of oil outlet holes are respectively located on both sides of the through hole in the axial direction.

[0016] In at least one possible implementation, the lip is bent using a riveting process.

[0017] The embodiment of the present application further provides a method for producing a motor rotor shaft, comprising:

[0018] Installing the oil pipe mounting member into the interior of the rotor shaft body from one axial end of the rotor shaft body;

[0019] Welding the end shaft to one axial end of the rotor shaft body to close the one axial end of the rotor shaft body, grinding the weld after welding to make the weld smooth, and cleaning the motor rotor shaft intermediate part including the rotor shaft body, the oil pipe mounting part and the end shaft;

[0020] The oil pipe is installed into the interior of the rotor shaft body from the other axial end of the rotor shaft body, wherein the oil pipe passes through the oil pipe mounting member, and one axial end of the oil pipe is inserted into the oil pipe mounting hole of the end shaft,

[0021] The lip portion of the oil pipe mounting member is bent and deformed, so that the oil pipe is fixed in the axial direction of the rotor shaft body.

[0022] In at least one possible implementation, when the lip is not deformed, the lip is located radially outside the oil pipe.

[0023] The lip is bent by a riveting process. When the lip is deformed, the lip is bent radially inward, and the lip is at least partially located on the other axial side of the oil pipe.

[0024] The embodiment of the present application further proposes a motor, comprising:

[0025] The motor rotor shaft according to any one of the above technical solutions; and

[0026] The motor rotor is sleeved and mounted on the motor rotor shaft.

[0027] By adopting the above technical solution, the motor rotor shaft of the present application can obtain at least one of the following beneficial effects.

[0028] (1) When cleaning the inner wall of the shaft body, the motor rotor shaft of the present application can be cleaned without installing the oil pipe. After cleaning, the oil pipe can be installed by deforming the lip, and the state without installing the oil pipe is easy to clean.

[0029] (2) The motor rotor shaft assembly process of the present application eliminates the welding process of the oil pipe and the oil pipe mounting parts, and the assembly process is simple and the assembly time is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A possible schematic structural diagram of a motor rotor shaft is shown.

[0031] Figure 2 A cross-sectional exploded view of a possible electric machine rotor shaft is shown.

[0032] Figure 3 A possible assembly flow chart of a motor rotor shaft is shown.

[0033] Figure 4 A schematic structural diagram of a motor rotor shaft according to an embodiment of the present application is shown.

[0034] Figure 5 A schematic structural diagram of an oil pipe mounting component for a motor rotor shaft according to an embodiment of the present application is shown.

[0035] Figure 6 A partial structural schematic diagram showing a motor rotor shaft according to an embodiment of the present application in which the lip is in an undeformed state during installation.

[0036] Figure 7 A partial structural schematic diagram showing a motor rotor shaft according to an embodiment of the present application in which the lip is in a deformed state during installation.

[0037] Figure 8 A flowchart of assembling a rotor shaft of a motor according to an embodiment of the present application is shown.

[0038] Description of Reference Numerals

[0039] 1 rotor shaft body 11 oil outlet hole 12 internal spline 13 step portion

[0040] 2 oil pipe 21 through hole

[0041] 3 end shaft 31 oil pipe installation hole

[0042] 4 Oil pipe mounting piece 41 lip 42 groove

[0043] A axial R radial DETAILED DESCRIPTION

[0044] In order to more clearly explain the above-mentioned purposes, features and advantages of the present application, the specific implementation methods of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various implementation methods described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions, so the present application is not limited by the specific embodiments disclosed in this section. The scope of protection of the present application shall be subject to the claims.

[0045] like Figures 4 to 8 As shown, the embodiment of the present application provides a motor rotor shaft and a method for producing a motor rotor shaft. The motor rotor shaft may include a rotor shaft body 1, an oil pipe 2, an end shaft 3 and an oil pipe mounting member 4. The rotor shaft body 1 is cylindrical, the oil pipe 2 is arranged inside the rotor shaft body 1, and the oil pipe 2 is mounted on the rotor shaft body 1 through the oil pipe mounting member 4.

[0046] The oil pipe 2 is cylindrical, and the wall of the oil pipe 2 may have a through hole 21, through which oil can flow from the inside of the oil pipe 2 to between the oil pipe 2 and the rotor shaft body 1. The through hole 21 may be arranged at the middle position in the axial direction of the oil pipe 2. A plurality of through holes 21 may be provided, and the plurality of through holes 21 may be arranged along the circumferential direction of the oil pipe 2.

[0047] The rotor shaft body 1 is provided with an oil outlet hole 11, which penetrates the wall of the rotor shaft body 1, and two groups of oil outlet holes 11 can be provided. In the axial direction A, the two groups of oil outlet holes 11 can be located on both sides of the through hole 21 respectively, between the rotor shaft body 1 and the oil pipe 2, and the oil can flow from the middle to both ends after passing through the through hole 21. Each group of oil outlet holes 11 can be provided with a plurality of oil outlet holes, and the plurality of oil outlet holes 11 can be arranged along the circumference of the rotor shaft body 1.

[0048] Figure 4The one-way arrow in the figure indicates the flow direction of the oil. The oil can enter the oil pipe 2 along the axial direction A and then flow through the through hole 21 along the radial direction R to the cavity between the oil pipe 2 and the rotor shaft body 1, and then flow to both sides of the axial direction and flow out of the motor rotor shaft from the oil outlet hole 11. The oil can cool the motor rotor shaft and the motor rotor by flowing inside the motor rotor shaft.

[0049] like Figure 6 and Figure 7 As shown, the inner circumference of the rotor shaft body 1 may be provided with a step portion 13, the step portion 13 includes an end face and a circumferential surface, the end face faces the oil pipe mounting member 4, and the oil pipe mounting member 4 extends from one axial end ( Figure 4 After the right end of the oil pipe mounting member 4 is installed into the rotor shaft body 1, the oil pipe mounting member 4 abuts against the end surface of the step portion 13, and the outer circumferential surface of the oil pipe mounting member 4 can be press-fitted with the circumferential surface of the step portion 13.

[0050] The rotor shaft body 1 may be provided with an internal spline 12 (see Figure 4 ), the internal spline 12 can be used to cooperate with the shaft to transmit torque. The internal spline 12 can be located at the other axial end of the unconnected end shaft 3 of the rotor shaft body 1 ( Figure 4 Moreover, the internal spline 12 may be located on the other axial side of the oil pipe 2 and the oil pipe mounting member 4 ( Figure 4 The left side in FIG. 1 , i.e., the other end side of the oil pipe 2).

[0051] like Figure 4 As shown, the end shaft 3 is connected to one axial end of the rotor shaft body 1 ( Figure 4 The rotor shaft body 1 and the end shaft 3 can be connected by welding, and can be ground after welding to make the outer peripheral surface of the motor rotor shaft smooth, which is convenient for the motor rotor shaft to be adapted and installed with other components of the motor.

[0052] The end shaft 3 may be provided with an oil pipe mounting hole 31, and the oil pipe 2 may be mounted in cooperation with the oil pipe mounting hole 31, and the oil pipe 2 may reach the bottom of the oil pipe mounting hole 31. The length of the end shaft 3 may be less than the length of the rotor shaft body 1, and thus the end shaft 3 may also be called a short shaft.

[0053] like Figure 4 and Figure 5 As shown, the oil pipe mounting member 4 may be annular, and the oil pipe mounting member 4 may be sleeved on the radially outer side of the oil pipe 2. The oil pipe 2 and the oil pipe mounting member 4 may be clearance-fitted.

[0054] The oil pipe mounting member 4 is provided with a lip 41, which may be located radially inward of the main body of the oil pipe mounting member 4, and may protrude axially from the main body of the oil pipe mounting member 4 to the other side. The lip 41 is thin, can be plastically deformed, and can be bent and deformed without being damaged, for example, the lip 41 may be bent by a riveting process.

[0055] like Figure 6 As shown, the lip 41 can extend axially in an undeformed state, so that the oil pipe 2 can pass through the oil pipe mounting member 4. Figure 7 As shown, the lip 41 can be bent radially inward in the deformed state to reduce the inner diameter of the oil pipe mounting part 4 (more specifically, the lip 41), and the lip 41 can be at least partially located at the end of the oil pipe 2 to limit the axial movement of the oil pipe 2.

[0056] One axial end of the oil pipe 2 ( Figure 4 The right end of the oil pipe 2 is supported and fixed by the end shaft 3. The other axial end of the oil pipe 2 ( Figure 4 The left end of the oil pipe 2 is supported and fixed by the oil pipe mounting member 4. In the axial direction A, the two ends of the oil pipe 2 are respectively in contact with the riveted lip 41 and the bottom of the oil pipe mounting hole 31, so that the oil pipe 2 is fixed in the axial direction A relative to the rotor shaft body 1.

[0057] like Figure 6 As shown, the transition portion between the lip 41 and the main body of the oil pipe mounting member 4 may be provided with a groove 42, which may be recessed from the main body of the oil pipe mounting member 4, and may be located at the outer peripheral side of the base end of the lip 41, and the groove 42 may make the lip 41 easier to bend during riveting. The cross section of the groove 42 may include an arc segment.

[0058] Refer to the following Figure 8 Introduce the assembly process of the motor rotor shaft.

[0059] (Step S1) The oil pipe mounting member 4 is inserted from one axial end ( Figure 8 The right end in FIG. 1 is inserted into the interior of the rotor shaft body 1 and fixed at the step portion 13. For example, the oil pipe mounting member 4 can be press-fitted to the step portion 13.

[0060] (Step S2) The rotor shaft body 1 and the end shaft 3 are welded together and ground after welding to make the weld smooth. The motor rotor shaft intermediate part including the rotor shaft body 1, the oil pipe mounting part 4 and the end shaft 3 but without the oil pipe 2 assembled thereto is cleaned.

[0061] (Step S3) Insert the oil pipe 2 from the other axial end of the rotor shaft body 1 ( Figure 8The left end in the middle) is installed into the interior of the rotor shaft body 1 and passes through the oil pipe mounting piece 4, one axial end of the oil pipe 2 is inserted into the oil pipe mounting hole of the end shaft 3, and then the lip 41 is bent and deformed to fix the oil pipe 2 in the axial direction.

[0062] It can be understood that the lip 41 can be in the form of a whole lip extending continuously around the whole circumference of the oil pipe mounting member 4, or in the form of a plurality of split lips that are broken in the circumferential direction of the oil pipe mounting member 4. The lip 41 can also be in the form of a plurality of teeth that are broken in the circumferential direction of the oil pipe mounting member 4. The lip 41 can be bent by a riveting process, or the lip 41, especially the split lip or the toothed lip, can be bent using an appropriate tool, so as to achieve axial positioning of the oil pipe 2.

[0063] The motor rotor shaft of the present application has the following beneficial effects.

[0064] (1) When cleaning the inner wall of the rotor shaft body 1 of the motor rotor shaft of the present application, the oil pipe 2 can be cleaned without installing it. The opening size of the other axial end of the rotor shaft body 1 is relatively large, and cleaning is easy and easy to clean. After cleaning, the oil pipe 2 is installed by deforming the lip, and it is easy to clean without installing the oil pipe. The oil pipe 2 of the motor rotor shaft in the background technology is not easy to disassemble, and needs to be welded, ground and cleaned after the oil pipe 2 is installed. It is necessary to go through the through hole with a smaller aperture on the oil pipe 2 or the rotor shaft body 1 (see Figure 4 The through hole 21 and the oil outlet hole 11 in the oil pipe 2 are used to clean the cavity between the oil pipe 2 and the rotor shaft body 1. The cleaning process is difficult to perform, and the dirt generated by grinding is not easy to discharge and is not easy to clean.

[0065] (2) Compared with the background technology, the motor rotor shaft assembly process of the present application eliminates the welding process of the oil pipe 2 and the oil pipe mounting member 4, and the assembly process is simple and the assembly time is shorter.

[0066] The present application also proposes a motor, which includes a motor rotor and the motor rotor shaft. The motor rotor can be sleeved and installed on the outer circumferential surface of the motor rotor shaft. The motor can be an oil-cooled inner rotor motor.

[0067] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.

[0068] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0069] In the present application, unless otherwise clearly stated or limited, the terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", "fastening" and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, regarding connectivity / conduction, it can be direct connectivity / conduction, or it can be indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0070] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0071] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.

Claims

1. A motor rotor shaft, characterized in that: It includes: A rotor shaft body (1), wherein the rotor shaft body (1) is cylindrical; An end shaft (3), the end shaft (3) being welded to one axial end of the rotor shaft body (1) so that the one axial end of the rotor shaft body (1) is closed; an oil pipe (2), the oil pipe (2) being arranged inside the rotor shaft body (1); and An oil pipe mounting member (4), the oil pipe mounting member (4) is annular, the oil pipe mounting member (4) is sleeved on the other axial end of the oil pipe (2), the oil pipe (2) is connected to the rotor shaft body (1) through the oil pipe mounting member (4), the oil pipe mounting member (4) is provided with a lip (41), and the lip (41) is located radially inside the body of the oil pipe mounting member (4), When the lip (41) is not deformed, the lip (41) is located radially outside the oil pipe (2), so that the oil pipe (2) passes through the oil pipe mounting member (4) and is installed in the rotor shaft body (1). When the lip (41) is deformed, it bends radially inward, and the lip (41) is at least partially located on the other axial side of the oil pipe (2), thereby limiting the axial (A) movement of the oil pipe (2) along the rotor shaft body (1).

2. The motor rotor shaft according to claim 1, characterized in that: The end shaft (3) is provided with an oil pipe mounting hole (31), the oil pipe (2) is inserted into the oil pipe mounting hole (31) and abuts against the bottom of the oil pipe mounting hole (31), one axial end of the oil pipe (2) is supported and fixed by the end shaft (3), and the other axial end of the oil pipe (2) is supported and fixed by the oil pipe mounting member (4).

3. The motor rotor shaft according to claim 1, characterized in that: The inner periphery of the rotor shaft body (1) is provided with a step portion (13), the step portion (13) includes an end face and a peripheral surface, the end face faces the oil pipe mounting member (4), the oil pipe mounting member (4) abuts against the end face of the step portion (13) and is press-fitted with the peripheral surface of the step portion (13).

4. The motor rotor shaft according to claim 1, characterized in that: When the lip (41) is in an undeformed state, the lip (41) protrudes from the main body of the oil pipe mounting member (4) along the axial direction of the oil pipe mounting member (4); when the lip (41) is in a deformed state, the lip (41) bends and extends radially inward.

5. The motor rotor shaft according to claim 1, characterized in that: The lip portion (41) and the main body of the oil pipe mounting member (4) are provided with a groove (42) at a transition portion, and the groove (42) is located on the outer peripheral side of the base end of the lip portion (41).

6. The motor rotor shaft according to claim 1, characterized in that: The wall of the rotor shaft body (1) is provided with two groups of oil outlet holes (11), and the wall of the oil pipe (2) is provided with a through hole (21), and the two groups of oil outlet holes (11) are respectively located on both sides of the through hole (21) in the axial direction (A).

7. The motor rotor shaft according to claim 1, characterized in that: The lip (41) is bent by using a riveting process.

8. A method for producing a motor rotor shaft, characterized in that: include: Installing the oil pipe mounting member (4) into the interior of the rotor shaft body (1) from one axial end of the rotor shaft body (1); Welding the end shaft (3) to one axial end of the rotor shaft body (1) to close the one axial end of the rotor shaft body (1), grinding the weld after welding to make the weld smooth, and cleaning the motor rotor shaft intermediate part including the rotor shaft body (1), the oil pipe mounting part (4) and the end shaft (3); The oil pipe (2) is installed into the interior of the rotor shaft body (1) from the other axial end of the rotor shaft body (1), wherein the oil pipe (2) passes through the oil pipe mounting member (4), and one axial end of the oil pipe (2) is inserted into the oil pipe mounting hole of the end shaft (3). The lip portion (41) of the oil pipe mounting member (4) is bent and deformed, thereby fixing the oil pipe (2) in the axial direction (A) of the rotor shaft body (1).

9. The method for producing a motor rotor shaft according to claim 8, characterized in that: When the lip (41) is not deformed, the lip (41) is located radially outside the oil pipe (2). The lip (41) is bent by a riveting process. When the lip (41) is deformed, the lip (41) is bent radially inward, and the lip (41) is at least partially located on the other axial side of the oil pipe (2).

10. A motor, characterized in that: include: The motor rotor shaft according to any one of claims 1 to 9; as well as The motor rotor is sleeved and mounted on the motor rotor shaft.

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