CN220857783U - Cooling tube, electric drive assembly and vehicle - Google Patents

Abstract

The utility model relates to an electric cooling technical field especially relates to a cooling tube, electric assembly and vehicle are driven to electricity, and this cooling tube includes cooling tube body and first seal structure, and wherein, the cooling tube body is including the runner that supplies cooling medium to circulate, and the runner includes relative first end and second end, and the inside wall of first end is equipped with oil return structure, and the second end is used for being connected with the rotor shaft hole of motor, and first seal structure locates the cooling tube body and is close to the lateral wall circumference of second end for the inner wall sealing fit in cooling tube body and rotor shaft hole. The cooling pipe disclosed by the invention is provided with the oil return structure at the first end, so that at least part of cooling medium flows back into the flow channel, and leakage of the cooling medium between the first end of the cooling pipe body and the outlet of the cooling flow channel is reduced; through set up first seal structure in the circumference of the lateral wall of second end for the second end can with the inner wall sealing fit in rotor shaft hole, thereby reduce the leakage point of coolant, guarantee the effective supply of coolant.

Description

Cooling tube, electric drive assembly and vehicle

Technical Field

The disclosure relates to the technical field of electric drive cooling, in particular to a cooling pipe, an electric drive assembly and a vehicle.

Background

The electric drive system at least comprises a motor, a speed reducer, a controller and the like, and can be used for a pure electric vehicle, a hydrogen energy vehicle or a hybrid electric vehicle, in order to improve the high-speed performance of the motor, the electric drive system generally adopts a scheme of directly cooling a rotor by using cooling oil, one end of an oil pipe is matched with a cooling flow passage of the speed reducer, and the other end of the oil pipe stretches into a rotor shaft hole, but the two ends of the oil pipe do not have a sealing structure in this way, so that oil can leak from the two ends of the oil pipe, the effective oil supply to the rotor is reduced, and lubrication and cooling are influenced.

Disclosure of utility model

The purpose of the present disclosure is to provide a cooling pipe, an electric drive assembly, and a vehicle, which can reduce the leakage amount of a cooling medium, and ensure the stability of the supply amount of the cooling medium.

To achieve the above object, a first aspect of the present disclosure provides a cooling tube comprising: the cooling pipe body comprises a flow passage for flowing cooling medium, the flow passage comprises a first end and a second end which are opposite, the first end is used for being connected with the outlet end of the cooling flow passage of the speed reducer shell, and the second end is used for being connected with a rotor shaft hole of the motor; and the first sealing structure is arranged in the circumferential direction of the outer side wall of the cooling pipe body, which is close to the second end, and is used for sealing and matching the cooling pipe body with the rotor shaft hole.

Optionally, the first sealing structure comprises a first annular groove circumferentially arranged around the outer side wall of the cooling tube body, so that the cooling tube body can be in sealing connection with the rotor shaft hole through a first sealing ring which is arranged in the first annular groove.

Optionally, the first end of the cooling pipe body is used for being sleeved at the outlet end of the cooling flow channel in a clearance way, and an oil return structure is arranged on the inner side wall of the first end of the flow channel; the oil return structure is configured to: at least a portion of the cooling medium in the gap is able to flow back into the flow channel as the cooling tube body rotates relative to the outlet end of the cooling flow channel.

Optionally, the oil return structure is configured as being located the runner circumference and with the ring channel structure of runner intercommunication, the inner wall of ring channel structure is equipped with the oil return groove, the oil return groove is from the ring channel structure is kept away from one side of first end is close to one side slope extension setting of first end.

Optionally, the number of the oil return grooves is multiple, and the oil return grooves are arranged at intervals along the circumferential direction of the inner wall of the annular groove structure.

Optionally, the cooling tube further comprises a first annular boss and a second annular boss which are formed in the circumferential direction of the cooling tube body and are fixedly connected with the shaft hole of the gear shaft in the speed reducer shell, and the first annular boss and the second annular boss are arranged at intervals along the extending direction of the cooling tube body.

Optionally, a plurality of protrusions for interference fit with the inner wall of the shaft hole are arranged on the circumference of the first annular boss.

Optionally, the second annular boss includes a second annular groove circumferentially arranged around an outer sidewall of the second annular boss, so that the second annular boss can be in sealing connection with the shaft hole through a second seal ring fitted into the second annular groove.

In a second aspect of the present disclosure, there is provided an electric drive assembly, including a speed reducer, a motor, and the cooling tube described above, the speed reducer includes a speed reducer housing and a gear shaft rotatably connected to the speed reducer housing, a cooling flow passage for providing a cooling medium is provided on the speed reducer housing, the first end of the cooling tube body is located in a shaft hole of the gear shaft and connected to an outlet of the cooling flow passage, the motor includes a rotor shaft spline-connected to the gear shaft, and the second end of the cooling tube body is sealingly connected to a rotor shaft hole of the rotor shaft.

In a third aspect of the present disclosure, a vehicle is provided that includes the above-described electric drive assembly.

Through above-mentioned technical scheme, the cooling tube of this disclosure sets up first seal structure through being used for the circumference of the lateral wall of the second end of being connected with the rotor shaft hole for the second end can with the inner wall sealing fit in rotor shaft hole, thereby reduces the leakage point of a cooling medium, guarantees the effective feed quantity of cooling medium.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic view of a first view structure of a cooling tube according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a second view structure of a cooling tube according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a cooling tube provided by an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of an electric drive assembly provided by an embodiment of the present disclosure;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A provided by an embodiment of the present disclosure;

Fig. 6 is a plan developed view of an inner wall surface of an oil return structure of a cooling pipe according to an embodiment of the present disclosure.

Description of the reference numerals

1-A cooling tube body; 101-flow channels; 102-a first end; 103-a second end; 2-a first sealing structure; 201-a first annular groove; 3-a first sealing ring; 4-an oil return structure; 401-annular groove structure; 402-an oil return groove; 5-a first annular boss; 501-bulge; 502-a weight reduction groove; 6-a second annular boss; 601-a second annular groove; 7-a second sealing ring; 8-a first limit structure; 801-elastic limiting piece; 9-avoiding part; 10-speed reducer; 1001-reducer housing; 1002-gear shaft; 1003-cooling runner; 1004-shaft holes; 11-rotor shaft; 1101-rotor shaft bore.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "upper, lower, left, right" and the like are used to generally refer to the respective components as "upper, lower, left, right" in the direction of the drawing, specifically, referring to the direction of the drawing shown in fig. 6, "inside and outside" means "inside and outside" with respect to the outline of the corresponding component itself. In addition, the terms "first," "second," and the like, as used in this disclosure, are used to distinguish one element from another element without sequence or importance. Furthermore, in the following description, when referring to the drawings, the same reference numerals in different drawings denote the same or similar elements unless otherwise explained. The foregoing definitions are provided for the purpose of illustrating and explaining the present disclosure and should not be construed as limiting the present disclosure.

In order to achieve the above object, as shown in fig. 1 to 5, a first aspect of the present disclosure provides a cooling tube, including a cooling tube body 1 and a first sealing structure 2, wherein the cooling tube body 1 includes a flow passage 101 through which a cooling medium flows, the flow passage 101 includes a first end 102 and a second end 103 opposite to each other, the first end 102 is configured to be connected to an outlet end of a cooling flow passage 1003 of a reducer housing 1001, the second end 103 is configured to be connected to a rotor shaft hole 1101 of an electric machine, and the first sealing structure 2 is disposed on an outer sidewall circumference of the cooling tube body 1 near the second end 103 for sealing engagement of the cooling tube body 1 with the rotor shaft hole 1101. Because the cooling tube body 1 rotates together with the rotor shaft hole 1101 of the motor while the electric drive works, the cooling flow passage 1003 on the speed reducer housing 1001 and the cooling tube body 1 are relatively static, and based on this, the present disclosure sets the first sealing structure 2 in the circumferential direction of the outer side wall of the second end 103 inserted in the rotor shaft hole 1101 and capable of rotating together with the rotor shaft 11, thereby reducing or even avoiding leakage of the cooling medium from the gap between the cooling tube body 1 and the rotor shaft hole 1101, so that the cooling medium leaks from the gap between the first end 102 and the cooling flow passage 1003 as much as possible, and compared with the case that no sealing structure is provided at both ends of the cooling tube in the related art, the leakage point is reduced, thereby reducing the leakage amount and ensuring the effective supply amount of the cooling medium.

Wherein the first sealing structure 2 comprises a first annular groove 201 circumferentially arranged around the outer side wall of the cooling tube body 1, so that the cooling tube body 1 can be sealingly connected with the rotor shaft hole 1101 by a first sealing ring 3 fitted into the first annular groove 201. The second end 103 and the rotor shaft hole 1101 are directly sealed through the arrangement of the annular groove and the sealing ring, the whole process is simple and convenient, the disassembly and assembly of the sealing ring are convenient, and the sealing efficiency of the first sealing structure 2 is ensured.

In addition, the cooling medium of the present disclosure may be configured as a fluid cooling medium such as cooling oil or cooling water, and the first seal ring 3 may be configured as an O-ring or the like.

In some embodiments of the present disclosure, as shown in fig. 1, a first end 102 of a cooling tube body 1 is used for being sleeved at an outlet end of a cooling flow passage 1003 in a clearance manner, and an oil return structure 4 is arranged on an inner side wall of the first end 102 of the flow passage 101; the oil return structure 4 is configured to: at least part of the cooling medium in the gap can flow back into the flow channel 101 when the cooling tube body 1 rotates relative to the outlet end of the cooling flow channel 1003. Since the oil return structure 4 can cover at least part of the outer periphery of the cooling flow passage 1003, at least part of the cooling medium flows into the oil return structure 4 from the gap when passing through the first end 102, and flows back into the flow passage 101 of the cooling pipe body 1 under the action of the oil return structure 4, thereby reducing the leakage of the cooling medium between the first end 102 of the cooling pipe body 1 and the outlet of the cooling flow passage 1003, and further ensuring the effective supply amount of the cooling medium.

In some embodiments, to facilitate covering the cooling flow channel 1003, the oil return structure 4 may be configured as an annular groove structure 401 located in the circumferential direction of the flow channel 101 and communicating with the flow channel 101, and an inner wall of the annular groove structure 401 may be provided with an oil return groove 402, where the oil return groove 402 extends obliquely from a side of the annular groove structure 401 away from the first end 102 to a side near the first end 102. In this way, part of the cooling medium flowing from the cooling flow passage 1003 flows into the oil return groove 402 through the gap between the inner wall of the annular groove structure 401 and the outer wall of the cooling flow passage 1003, and the oil return groove 402 will return the cooling medium located therein to the flow passage 101 of the cooling pipe body 1 when the cooling pipe body 1 rotates, so as to reduce leakage of the cooling medium, wherein, it should be noted that the inclination direction of the oil return groove 402 should be appropriately adjusted according to the rotation direction of the cooling pipe body 1, for example, when the cooling pipe body 1 rotates counterclockwise as seen in fig. 1, then the oil return groove 402 may extend from the side facing away from the cooling pipe body 1 to the upper left as seen in fig. 6 when the cooling pipe body 1 rotates, so that the cooling medium located in the oil return groove 402 moves to the right side as seen in the view of fig. 6, and the centrifugal force of the cooling medium given when the oil return structure 4 rotates, so that the cooling medium can cling to the bottom surface of the oil return groove 402 and move to the upper left side of the cooling pipe body 1 again. Similarly, when the cooling pipe body 1 rotates clockwise as viewed from the flow direction of the cooling medium, then the return groove may extend in an upward right direction from the side facing away from the cooling pipe body 1 as viewed in a direction perpendicular to the inner wall of the annular groove structure 401.

In order to further reduce the leakage amount of the cooling medium, the number of the oil return grooves 402 may be plural and arranged at intervals along the circumferential direction of the inner wall of the annular groove structure 401, and by increasing the number of the oil return grooves 402, more cooling medium flows into the oil return grooves 402, thereby increasing the return amount of the cooling medium and reducing the leakage amount.

In the embodiment of the present disclosure, the cooling tube further includes a first annular boss 5 and a second annular boss 6 formed in the circumferential direction of the cooling tube body 1 and for fixedly connecting with the shaft hole 1004 of the gear shaft 1002 in the speed reducer case 1001, the first annular boss 5 and the second annular boss 6 being disposed at intervals along the extending direction of the cooling tube body 1. The cooling pipe is connected to the shaft hole 1004 of the gear shaft 1002 through the first annular boss 5 and the second annular boss 6, and then rotates together with the gear shaft 1002.

Wherein, a plurality of protruding portions 501 for interference fit with the inner wall of the shaft hole 1004 can be arranged on the first annular boss 5 in the circumferential direction, so that the outer diameter of the first annular boss 5 is slightly larger than the inner diameter of the shaft hole 1004, and thus, the protruding portions 501 can be elastically deformed under the extrusion of the inner wall of the shaft hole 1004 in the process of loading the cooling tube body 1 into the shaft hole 1004, and the restoring force generated by the elastic deformation is in interference fit with the inner wall of the shaft hole 1004, so that the connection effect of the cooling tube body 1 and the shaft hole 1004 is ensured.

In addition, in order to reduce the overall weight of the cooling tube, the first annular boss 5 is further provided with a plurality of weight-reducing grooves 502 recessed toward the inside of the first annular boss 5 at intervals, and of course, the arrangement positions of the weight-reducing grooves 502 may be arbitrarily set without affecting the connection of the first annular boss 5 with the shaft hole 1004, or in some not-shown embodiments, the weight-reducing grooves 502 may be replaced with weight-reducing through holes penetrating through the first annular boss 5.

In some embodiments, as shown in fig. 4, since the second end 103 of the cooling tube body 1 and the rotor shaft hole 1101 need to be connected by a spline, in order to prevent a part of the cooling medium leaked from the first end 102 from flowing into the spline, affecting the connection of the cooling tube body 1 and the rotor shaft hole 1101, the second annular boss 6 includes a second annular groove 601 circumferentially arranged around the outer sidewall of the second annular boss 6, so that the second annular boss 6 can be sealingly connected with the shaft hole 1004 by a second seal ring 7 fitted into the second annular groove 601, thereby isolating the leaked part of the cooling medium from the spline.

In some embodiments of the present disclosure, the cooling tube is further formed with a first limit structure 8 of the cooling tube body 1, where the first limit structure 8 is used to cooperatively connect with a second limit structure of the gear shaft 1002, so as to limit the relative movement of the cooling tube and the gear shaft 1002, so as to prevent the cooling tube from falling out of the gear shaft 1002. Wherein, the second limit structure is configured as a clamping groove positioned on the inner side wall of the shaft hole 1004 of the gear shaft 1002; the first limiting structure 8 is configured as an elastic limiting piece 801 extending obliquely from the outer side wall of the cooling pipe body 1 along the radial direction and towards the first end 102, and the elastic limiting piece 801 can be clamped with the clamping groove in a matching manner. The tail end of the elastic limiting piece 801 moves to one side close to the cooling pipe body 1 under the extrusion of the inner wall of the shaft hole 1004 when just contacting with the inner wall of the shaft hole 1004 until the distance between the tail end of the elastic limiting piece 801 and the axis of the cooling pipe body 1 is the same as the radius of the shaft hole 1004, when the elastic limiting piece 801 moves to the limiting groove, the elastic limiting piece 801 enters the limiting groove under the action of elastic restoring force, so that the cooling pipe body 1 is clamped in the shaft hole 1004, the cooling pipe body 1 is prevented from falling off from the shaft hole 1004 when rotating, and the stability of the cooling pipe body 1 in the axial direction is ensured.

In some embodiments, not shown, the elastic stopper 801 may also be configured as an elastic member that can expand and contract in a direction perpendicular to the surface of the cooling pipe body 1, including, but not limited to, a spring, etc.

In some embodiments, the elastic limiting element 801 is disposed on a side close to the first annular boss 5, so that the outer peripheral side of the first annular boss 5 may be provided with the avoiding portion 9 recessed toward the central axis direction of the first annular boss 5, so that the elastic limiting element 801 can enter the avoiding portion 9 under the extrusion of the inner wall of the shaft hole 1004, and normal operation of the elastic limiting element 801 is ensured.

In a second aspect of the present disclosure, there is provided an electric drive assembly, including a speed reducer 10, a motor, and the cooling tube described above, the speed reducer 10 includes a speed reducer housing 1001 and a gear shaft 1002 rotatably connected in the speed reducer housing 1001, a cooling flow passage 1003 for providing a cooling medium is provided in the speed reducer housing 1001, a first end 102 of the cooling tube body 1 is located in a shaft hole 1004 of the gear shaft 1002 and is connected to an outlet of the cooling flow passage 1003, the motor includes a rotor shaft 11 spline-connected with the gear shaft 1002, and a second end 103 of the cooling tube body 1 is sealingly connected to the rotor shaft hole 1101 of the rotor shaft 11. The electric drive assembly has all the beneficial effects of the cooling pipe, and the disclosure is not repeated here.

In a third aspect of the present disclosure, a vehicle is provided, including the foregoing electric drive assembly, which has all the advantages of the electric drive assembly, and the disclosure is not repeated herein.

In summary, the working principle of the present disclosure is: in the process of loading the cooling tube body 1 into the shaft hole 1004, the elastic limiting piece 801 enters the avoiding part 9 on the first annular boss 5 under the extrusion of the shaft hole 1004 until the cooling tube body 1 reaches the installation position of the cooling tube body with the shaft hole 1004, the elastic limiting piece 801 is clamped into a limiting groove (not shown in the figure) on the inner wall of the shaft hole 1004 again under the action of elastic restoring force, so that the cooling tube body 1 is clamped into the shaft hole 1004, the stability of the cooling tube body 1 in the axial direction is ensured, at the moment, the oil return structure 4 at the first end 102 of the cooling tube body 1 is inserted into the shaft hole 1101 at the outlet of the cooling flow passage 1003, the second end 103 of the cooling tube body 1 is inserted into the shaft hole 1101 and is in sealing connection with the shaft hole 1101 through the first sealing ring 3 installed on the first annular boss 201, the first annular boss 5 is in interference fit with the shaft hole 1004 through the protrusion 501, the second annular boss 6 is in sealing fit with the shaft hole 1004 through the second sealing ring 7 installed on the second annular groove 601, when the electric drive works, the cooling tube body 1 rotates along with the rotor shaft 11 and the gear shaft 1002, the cooling oil flowing out of the cooling tube body 1 in the axial direction is ensured, at the moment, the cooling oil flowing out of the cooling flow passage 103 can flow from the cooling tube body 1 through the cooling flow passage 1 at least flows into the first annular groove 1101, the inner wall of the rotor groove 1101 is also, the cooling oil leakage of the cooling channel is avoided, and the cooling oil can flow from the inner wall of the rotor body is directly through the first annular groove 1101 through the cooling channel 101, and the cooling channel is at least has a gap, and the cooling oil leakage can be avoided, and can flow from the cooling channel 1, and can flow from the cooling channel side directly has a lower efficiency, and has a cooling oil flow and can be directly and has a lower efficiency.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A cooling tube, comprising:

The cooling pipe body comprises a flow passage for flowing cooling medium, the flow passage comprises a first end and a second end which are opposite, the first end is used for being connected with the outlet end of the cooling flow passage of the speed reducer shell, and the second end is used for being connected with a rotor shaft hole of the motor; and

The first sealing structure is arranged on the periphery of the outer side wall of the cooling pipe body, which is close to the second end, and is used for sealing and matching the cooling pipe body with the rotor shaft hole.

2. The cooling tube of claim 1, wherein the first seal structure includes a first annular groove circumferentially disposed about an outer sidewall of the cooling tube body such that the cooling tube body can be sealingly connected to the rotor shaft bore by a first seal ring received within the first annular groove.

3. The cooling tube according to claim 1 or 2, wherein a first end of the cooling tube body is arranged at an outlet end of the cooling flow passage in a clearance fit manner, and an oil return structure is arranged on an inner side wall of the first end of the flow passage;

The oil return structure is configured to: at least a portion of the cooling medium in the gap is able to flow back into the flow channel as the cooling tube body rotates relative to the outlet end of the cooling flow channel.

4. A cooling tube according to claim 3, wherein the oil return structure is configured as an annular groove structure which is located in the circumferential direction of the flow passage and communicated with the flow passage, an oil return groove is formed in the inner wall of the annular groove structure, and the oil return groove is obliquely arranged from the side of the annular groove structure away from the first end to the side close to the first end.

5. The cooling tube of claim 4, wherein the number of oil return grooves is plural and is spaced circumferentially along the inner wall of the annular groove structure.

6. The cooling tube according to claim 1, further comprising a first annular boss and a second annular boss formed in a circumferential direction of the cooling tube body and fixedly connected to a shaft hole of a gear shaft in the speed reducer housing, the first annular boss and the second annular boss being disposed at an interval along an extending direction of the cooling tube body.

7. The cooling tube of claim 6, wherein the first annular boss is circumferentially provided with a plurality of protrusions for interference fit with an inner wall of the shaft bore.

8. The cooling tube of claim 6, wherein the second annular boss includes a second annular groove circumferentially disposed about an outer sidewall of the second annular boss such that the second annular boss is capable of sealing connection with the shaft bore by a second seal ring received within the second annular groove.

9. An electric drive assembly comprising a speed reducer, a motor and the cooling tube of any one of claims 1-8, wherein the speed reducer comprises a speed reducer housing and a gear shaft rotatably connected in the speed reducer housing, a cooling flow passage for providing cooling medium is arranged on the speed reducer housing, the first end of the cooling tube body is positioned in a shaft hole of the gear shaft and is connected with an outlet of the cooling flow passage, the motor comprises a rotor shaft in spline connection with the gear shaft, and the second end of the cooling tube body is in sealing connection with a rotor shaft hole of the rotor shaft.

10. A vehicle comprising the electric drive assembly of claim 9.