Traction motor

Abstract

The invention relates to the technical field of traction motors, and provides a traction motor which comprises a rotating shaft and a floating end assembly, the floating end assembly comprises a first end cover, a first bearing and a first inner sealing ring, the first inner sealing ring comprises an injection part, and a grease channel and a first bearing chamber are formed in the first end cover; the first bearing is arranged in the first bearing chamber and arranged outside the rotating shaft in a sleeving mode, the first inner sealing ring is arranged in the first bearing chamber, the central axis of the first inner sealing ring is higher than that of the rotating shaft, the injection part is located above the central axis of the first inner sealing ring, and the grease channel is communicated with the injection part. According to the traction motor provided by the embodiment of the invention, by lifting the injection part, the flowing path of the lubricating medium can be shortened, and the lubricating effect of the bearing is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of traction motors, and in particular to a traction motor. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] Traction motors usually use lubricating media such as grease to lubricate bearings. Grease can reduce friction between bearings and other parts, and can also seal the gaps between parts to extend the service life of the traction motor. In related technologies, the flow path of the lubricating medium is long, resulting in the lubricating medium being unable to lubricate the bearings in time, affecting the operating stability of the traction motor. Summary of the invention

[0004] In view of this, an embodiment of the present application hopes to provide a traction motor that can shorten the flow path of the lubricating medium and enhance the lubrication effect of the bearing.

[0005] An embodiment of the present application provides a traction motor, comprising:

[0006] Rotating shaft;

[0007] A floating end assembly comprises a first end cover, a first bearing and a first inner sealing ring, wherein the first inner sealing ring comprises an injection portion, and the first end cover is formed with a grease passage and a first bearing chamber; the first bearing is arranged in the first bearing chamber and sleeved outside the rotating shaft, the first inner sealing ring is arranged in the first bearing chamber, the central axis of the first inner sealing ring is higher than the central axis of the rotating shaft, the injection portion is located above the central axis of the first inner sealing ring, and the grease passage is communicated with the injection portion.

[0008] In some embodiments, the first bearing chamber includes a first circumferential surface and a second circumferential surface, the first inner sealing ring includes a third circumferential surface, and the third circumferential surface forms a guide groove that penetrates axially; the first bearing includes a first outer ring, the circumferential surface of the first outer ring abuts the first circumferential surface, the third circumferential surface abuts the second circumferential surface, and the guide groove is connected to the injection part.

[0009] In some embodiments, a diameter of the first outer ring is greater than a diameter of the first inner sealing ring.

[0010] In some embodiments, the first bearing chamber includes a first end face, the first end face faces the first inner sealing ring and is connected to the second circumferential surface, the connection between the first end face and the second circumferential surface forms a first transition portion, the first inner sealing ring includes a second end face connected to the third circumferential surface, the second end face abuts the first end face, the connection between the second end face and the third circumferential surface forms a second transition portion, the first transition portion and the second transition portion jointly define a storage space, and the guide groove is connected to the storage space.

[0011] In some embodiments, the first inner sealing ring and the first outer ring abut against each other to form a lubrication space, and the first inner sealing ring forms an oil inlet hole, which communicates the storage space and the lubrication space.

[0012] In some embodiments, the floating end assembly includes a first outer cover and a plurality of sealing rings, wherein the first outer cover is disposed on a side of the first bearing away from the first inner sealing ring, the first outer cover is connected to the first end cover, the sealing ring is sealingly clamped between the first outer cover and the first end cover, and the plurality of sealing rings are radially spaced apart.

[0013] In some embodiments, the floating end assembly includes an adhesive portion, the adhesive portion is bonded to the first outer cover and the first end cover, and the adhesive portion is located between two adjacent sealing rings.

[0014] In some embodiments, the floating end assembly includes a first outer sealing ring, the first bearing includes a first inner ring, the first outer sealing ring and the first inner ring are both sleeved outside the rotating shaft, the first outer sealing ring abuts against the end surface of the first inner ring facing the first side, and a labyrinth seal is formed between the first outer sealing ring and the first outer cover.

[0015] In some embodiments, the floating end assembly includes a first sleeve, the first bearing includes a first inner ring, the first sleeve and the first inner ring are both sleeved outside the rotating shaft, the first sleeve abuts against the end surface of the first inner ring facing the second side, and a labyrinth seal is formed between the first sleeve and the first inner sealing ring.

[0016] In some embodiments, the traction motor includes a positioning end assembly, which is arranged at an end of the rotating shaft away from the floating end assembly, and the positioning end assembly includes a bearing seat, a second bearing, a third bearing and a spacer sleeve, the bearing seat forms a second bearing chamber, the second bearing, the third bearing and the spacer sleeve are all arranged in the second bearing chamber and sleeved outside the rotating shaft, wherein the second bearing and the third bearing are respectively assembled to both sides of the spacer sleeve along the axial direction from the first side and the second side.

[0017] In some embodiments, the positioning end assembly includes a second outer sealing ring, which is arranged at an end of the third bearing away from the spacer sleeve, the second outer sealing ring is connected to the bearing seat, and the third outer ring 331 of the third bearing and the second outer sealing ring are connected by a pin.

[0018] In some embodiments, the bearing seat forms a grease passage, the spacer sleeve forms two grease filling holes connected to the grease passage, the spacer sleeve forms a partition, the two grease filling holes are respectively located on both sides of the partition along the axial direction, and the grease in the grease passage enters the second bearing through one of the grease filling holes and enters the third bearing through the other grease filling hole.

[0019] In the traction motor provided in the embodiment of the present application, the injection part is located above the central axis of the first inner sealing ring. The central axis of the first inner sealing ring is higher than the central axis of the rotating shaft, which raises the position of the injection part, thereby shortening the length of the grease channel and reducing the flow time of grease in the grease channel. The grease can flow into the first bearing chamber faster, so that the first bearing is fully and effectively lubricated, thereby improving the operating stability of the traction motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a traction motor provided in some embodiments of the present application, wherein L1 represents the central axis of the rotating shaft, and L2 represents the central axis of the first inner sealing ring;

[0021] Figure 2 A cross-sectional view of a floating end assembly and a rotating shaft assembly provided for some embodiments of the present application;

[0022] Figure 3 A schematic diagram of a grease channel provided for some embodiments of the present application, wherein a solid arrow indicates a flow path of a lubricating medium;

[0023] Figure 4 for Figure 2 The enlarged view of point A in the middle, where L3 represents the flow path of the lubricating medium;

[0024] Figure 5 for Figure 2 Enlarged view of point B in the middle;

[0025] Figure 6 for Figure 2 Enlarged view of point C in the middle;

[0026] Figure 7 A schematic diagram of the structure of a first inner sealing ring provided in some embodiments of the present application;

[0027] Figure 8 A schematic diagram of an atmospheric channel provided for some embodiments of the present application, wherein L4 represents a flow path of an airflow;

[0028] Fig. 9 Cross-sectional view of the positioning end assembly and the rotating shaft assembly provided for some embodiments of the present application

[0029] Fig.10 for Fig. 9 Enlarged view of point D in the middle;

[0030] Fig.11 for Fig. 9 Enlarged view of point E in the middle.

[0031] Description of Reference Numerals

[0032] Traction motor 100;

[0033] Rotating shaft 10; transmission end 10a; non-transmission end 10b;

[0034] Floating end assembly 20;

[0035] first end cover 21; grease passage 21a; first bearing chamber 21b; first circumferential surface 21b1; second circumferential surface 21b2; first end surface 21b3; first transition portion 21b4; storage space 21c; atmosphere passage 21d; stop pin 211;

[0036] First bearing 22; first outer ring 221; first inner ring 222;

[0037] first inner sealing ring 23; injection portion 23a; injection groove 23a1; third circumferential surface 23b; guide groove 23b1; second end surface 23c; second transition portion 23c1; oil inlet hole 23d; stopper hole 23e; lubrication space 23f;

[0038] First outer cover 24; groove 24a; oil return hole 24b;

[0039] Sealing ring 25; adhesive portion 25a;

[0040] First outer sealing ring 26; first shaft sleeve 27;

[0041] Positioning end assembly 30;

[0042] Bearing seat 31; second bearing chamber 31a; boss 31a1; grease passage 31b;

[0043] Second bearing 32; second outer ring 321; second inner ring 322;

[0044] A third bearing 33; a third outer ring 331; a third inner ring 332;

[0045] Spacer 34; grease filling hole 34a; partition 341;

[0046] A second outer sealing ring 35; a second shaft sleeve 36;

[0047] Speed ​​measuring toothed disc 37; inner bearing cover 38;

[0048] A second end cover 39; a second outer cover 40;

[0049] Sealing ring 41. DETAILED DESCRIPTION

[0050] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0051] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in this application are no longer described separately. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] See also Figures 1 to 11 The embodiment of the present application provides a traction motor 100, including a rotating shaft 10 and a floating end assembly 20, wherein the floating end assembly 20 includes a first end cover 21, a first bearing 22 and a first inner sealing ring 23, wherein the first inner sealing ring 23 includes an injection portion 23a, and the first end cover 21 is formed with a grease passage 21a and a first bearing chamber 21b. The first bearing 22 is disposed in the first bearing chamber 21b and sleeved outside the rotating shaft 10, and the first inner sealing ring 23 is disposed in the first bearing chamber 21b, wherein the central axis of the first inner sealing ring 23 is higher than the central axis of the rotating shaft 10, and the injection portion 23a is located above the central axis of the first inner sealing ring 23, and the grease passage 21a is connected to the injection portion 23a.

[0053] The traction motor 100 can generate traction to drive the vehicle to move, and is commonly used in railway mainline electric locomotives, industrial and mining electric locomotives, electric transmission diesel locomotives and various electric vehicles.

[0054] The rotating shaft 10 can rotate around the central axis of the rotating shaft 10. Figure 1 The rotating shaft 10 has a transmission end 10 a, and the transmission end 10 a is used to transmit the rotation speed and torque of the traction motor 100 to the external load to achieve normal operation and power output of the traction motor 100.

[0055] The floating end assembly 20 is disposed at the transmission end 10a of the rotating shaft 10. The first end cover 21 can prevent dust, water vapor, etc. from entering the traction motor 100, and play a good protective role for the components in the traction motor 100, such as bearings, rotors, stators, etc. The first end cover 21 can also improve the structural stability of the traction motor 100.

[0056] The grease channel 21a is used to circulate lubricating media such as grease. The grease can fill the gaps between the components, thereby reducing the mechanical friction between the components, reducing the vibration transmitted between the components, and playing a lubricating and protective role.

[0057] The lubricating medium is a fluid used for lubrication, and the lubricating medium includes but is not limited to grease. Grease is a flowable semi-solid, that is, a relatively viscous fluid. The specific type of grease is not limited, for example, it can be molybdenum disulfide calcium-based grease, complex calcium-based grease, lithium-based grease, etc. For ease of description, this application takes grease as an example of the lubricating medium for description.

[0058] The first bearing 22 is sleeved outside the rotating shaft 10, and a portion of the first bearing 22 can rotate along with the rotating shaft 10. The specific type of the first bearing 22 is not limited, and for example, it can be a cylindrical roller bearing (NU bearing).

[0059] The first inner sealing ring 23 is disposed in the first bearing chamber 21b, and the first inner sealing ring 23 is formed with an injection portion 23a connected to the grease channel 21a, that is, the grease can enter the injection portion 23a through the grease channel 21a, and then enter the first bearing chamber 21b, and play a role in lubricating the first bearing 22 and other components, thereby improving the operating stability of the traction motor 100. For details, please refer to Figure 2 and Figure 3 The grease channel 21a is higher than the injection portion 23a, and at least a portion of the grease channel 21a is inclined. When the grease needs to be replenished, by applying a squeezing force to the grease in the grease channel 21a, the grease can flow more smoothly in the floating end assembly 20 under the action of the squeezing force and gravity, and then flow into the first bearing 22.

[0060] See also Figure 2 and Figure 4 The injection portion 23a is higher than the center axis of the first inner sealing ring 23, and the center axis of the first inner sealing ring 23 is higher than the center axis of the rotating shaft 10. In this way, the position of the injection portion 23a is raised, thereby shortening the length of the grease channel 21a and reducing the flow time of the grease in the grease channel 21a. The grease can flow into the injection portion 23a faster, that is, into the first bearing chamber 21b, so that the first bearing 22 is fully and effectively lubricated, thereby improving the operating stability of the traction motor 100.

[0061] In the traction motor 100 provided in the embodiment of the present application, the injection portion 23a is located above the central axis of the first inner sealing ring 23. The central axis of the first inner sealing ring 23 is higher than the central axis of the rotating shaft 10, which raises the position of the injection portion 23a, thereby shortening the length of the grease channel 21a and reducing the flow time of grease in the grease channel 21a. The grease can flow into the first bearing chamber 21b faster, so that the first bearing 22 is fully and effectively lubricated, thereby improving the operating stability of the traction motor 100.

[0062] It should be noted that, in the present application, the axial direction refers to the axial direction of the rotating shaft 10 .

[0063] For some examples, see Figure 4 and Figure 7 The first end cover 21 is provided with a limit pin 211, and the first inner sealing ring 23 is formed with a limit hole 23e, and the limit pin 211 is inserted into the limit hole 23e. In this way, the first inner sealing ring 23 can be prevented from rotating with the rotating shaft 10 through the cooperation of the limit pin 211 and the limit hole 23e, so that the position of the injection part 23a can be kept unchanged, that is, the flow path of the grease will not be affected, and the flow stability of the grease is guaranteed.

[0064] In one embodiment, please refer to Figure 7 The limiting hole 23e is higher than the center axis of the first inner sealing ring 23, which is convenient for inserting the limiting pin 211.

[0065] For some examples, see Figure 4 and Figure 7 The first bearing chamber 21b includes a first circumferential surface 21b1 and a second circumferential surface 21b2, the first inner sealing ring 23 includes a third circumferential surface 23b, and the third circumferential surface 23b forms a guide groove 23b1 that penetrates along the axial direction; the first bearing 22 includes a first outer ring 221, the circumferential surface of the first outer ring 221 abuts the first circumferential surface 21b1, the third circumferential surface 23b abuts the second circumferential surface 21b2, and the guide groove 23b1 is connected to the injection portion 23a.

[0066] The circumferential surface of the first outer ring 221 abuts against the first circumferential surface 21b1, and the first bearing chamber 21b can provide support force for the first bearing 22. During the rotation of the shaft 10, the first outer ring 221 remains stationary, and the rotating part of the first bearing 22 can rotate relatively smoothly and stably.

[0067] The third circumferential surface 23b abuts against the second circumferential surface 21b2, and the first bearing chamber 21b can provide support for the first inner sealing ring 23, thereby improving the stability of the first inner sealing ring 23. At the same time, the first inner sealing ring 23 seals the first bearing chamber 21b, thereby preventing the grease from flowing freely and leaking outward, thereby ensuring the flow stability of the grease.

[0068] The guide groove 23b1 is connected to the injection portion 23a, that is, the grease can flow into the guide groove 23b1 through the injection portion 23a, and the grease can flow to the first bearing 22 through the guide groove 23b1 that penetrates in the axial direction.

[0069] For some examples, see Figure 4 The circumferential surface of the first outer ring 221, the second circumferential surface 21b2 and the third circumferential surface 23b jointly define an injection groove 23a1, and the injection portion 23a is located in the injection groove 23a1. There are multiple guide grooves 23b1, and the multiple guide grooves 23b1 surround the third circumferential surface 23b and are distributed at intervals. All guide grooves 23b1 are connected to the injection groove 23a1. In other words, the injection groove 23a1 is an annular structure, and the grease can flow to the injection groove 23a1 through the injection portion 23a and fill the entire injection groove 23a1, and then flow to the first bearing 22 through the multiple guide grooves 23b1. In this way, the circulation speed of the grease can be increased, so that the first bearing 22 can be lubricated in time.

[0070] For example, see Figure 7 There are two guide grooves 23 b 1 , and the two guide grooves 23 b 1 are symmetrically distributed along the radial direction of the first inner sealing ring 23 .

[0071] It should be noted that, in the present application, a plurality refers to a quantity including two or more.

[0072] For some examples, see Figure 2 , the diameter of the first outer ring 221 is greater than the diameter of the first inner sealing ring 23. That is to say, the diameter of the first circumferential surface 21b1 is greater than the diameter of the second circumferential surface 21b2. In this way, on the one hand, during the assembly process of the floating end assembly 20, it is convenient for the first inner sealing ring 23 to pass through the first circumferential surface 21b1 and be installed in the first bearing chamber 21b, and then the first bearing 22 is installed in the first bearing chamber 21b, thereby reducing the difficulty of assembly. On the other hand, when the first inner sealing ring 23 is installed and the first bearing 22 is not installed, the injection groove 23a1 is formed with an annular opening, so that the operator can first fill the grease into the injection groove 23a1 through the opening, which is convenient for operation. After the first bearing 22 is installed in the first bearing chamber 21b, the circumferential surface of the first outer ring 221 closes the opening, thereby improving the sealing performance of the injection groove 23a1 and preventing grease leakage.

[0073] For some examples, see Figure 4The first bearing chamber 21b includes a first end face 21b3, the first end face 21b3 faces the first inner sealing ring 23 and is connected to the second circumferential surface 21b2, and the connection between the first end face 21b3 and the second circumferential surface 21b2 forms a first transition portion 21b4, the first inner sealing ring 23 includes a second end face 23c connected to the third circumferential surface 23b, the second end face 23c abuts the first end face 21b3, and the connection between the second end face 23c and the third circumferential surface 23b forms a second transition portion 23c1, the first transition portion 21b4 and the second transition portion 23c1 jointly define a storage space 21c, and the guide groove 23b1 is connected to the storage space 21c. In other words, the storage space 21c is annular in structure, and the grease can flow into the storage space 21c through the guide groove 23b1, and flow to the first bearing 22 through the storage space 21c. The storage space 21 c can be used to store grease, thereby increasing the capacity of the grease in the first bearing chamber 21 b and ensuring the lubrication effect on the first bearing 22 .

[0074] The second end face 23c abuts against the first end face 21b3, which can enhance the sealing performance of the first inner sealing ring 23 and prevent the grease from leaking out of the storage space 21c. Exemplarily, the second end face 23c seals against the first end face 21b3.

[0075] In one embodiment, all the guide grooves 23b1 are connected to the storage space 21c, that is, the injection groove 23a1 and the storage space 21c are connected through multiple guide grooves 23b1, so that during the assembly of the floating end assembly 20, the grease filled in the injection groove 23a1 can flow into the storage space 21c through the multiple guide grooves 23b1, and the grease can fill the entire storage space 21c. In this way, when the floating end assembly 20 is assembled and the grease needs to be replenished through the grease channel 21a, the grease in the storage space 21c can flow to the first bearing 22 and other components first, so that the first bearing 22 can be lubricated in time.

[0076] For some examples, see Figure 4 , the first inner sealing ring 23 and the first outer ring 221 abut against each other and form a lubrication space 23f, the first inner sealing ring 23 forms an oil inlet hole 23d, and the oil inlet hole 23d connects the storage space 21c and the lubrication space 23f. In other words, the lubrication space 23f is annular, and the grease flows from the storage space 21c into the lubrication space 23f through the oil inlet hole 23d, and then flows into the first bearing 22 through the lubrication space 23f. Combined with the above description of the flow path of the grease, it can be understood that the grease passes through the grease channel 21a, the injection part 23a (injection groove 23a1), the guide groove 23b1, the storage space 21c, the oil inlet hole 23d and the lubrication space 23f in sequence, and finally flows into the first bearing 22, thereby lubricating the first bearing 22.

[0077] For some examples, see Figure 7 There are multiple oil inlet holes 23d, and the multiple oil inlet holes 23d are distributed at intervals along the circumference of the first inner sealing ring 23. That is to say, the lubrication space 23f and the storage space 21c are connected through the multiple oil inlet holes 23d. In this way, the circulation speed of the grease can be increased, so that the first bearing 22 can be lubricated in time.

[0078] In the related art, the transmission end 10a of the rotating shaft 10 is connected to the gear box, and the gear box is arranged outside the first end cover 21. Part of the lubricating oil in the gear box may flow into the first bearing chamber 21b and flow to the outside through the first bearing chamber 21b to cause pollution.

[0079] For some examples, see Figure 5 The floating end assembly 20 includes a first outer cover 24 and a plurality of sealing rings 25. The first outer cover 24 is arranged on a side of the first bearing 22 away from the first inner sealing ring 23. The first outer cover 24 is connected to the first end cover 21. The sealing ring 25 is sealed and clamped between the first outer cover 24 and the first end cover 21. The plurality of sealing rings 25 are arranged at intervals along the radial direction.

[0080] For example, see Figure 2 The first bearing chamber 21b is formed with an inlet and outlet, and the first outer cover 24 shields at least part of the inlet and outlet. The first outer cover 24 can prevent impurities such as dust and water vapor from entering the first bearing chamber 21b, and protect the first bearing 22 and other components. The first outer cover 24 is connected to the first end cover 21, and the first outer cover 24 provides a certain support force for the first end cover 21, which can enhance the structural stability of the floating end assembly 20.

[0081] The sealing ring 25 is sealed and clamped between the first outer cover 24 and the first end cover 21. The sealing ring 25 can seal the gap between the first outer cover 24 and the first end cover 21. The multiple sealing rings 25 play a role of multiple sealing. In this way, on the one hand, it can prevent foreign dust, water vapor and other impurities from entering the first bearing chamber 21b through the gap, further enhancing the protection of the first bearing 22 and other parts. On the other hand, compared with the related technology, the multiple sealing rings 25 in the present application can prevent the lubricating oil entering the first bearing chamber 21b from flowing to the outside through the gap to cause pollution.

[0082] The specific material of the sealing ring 25 is not limited, for example, it can be silicone rubber, polytetrafluoroethylene, etc.

[0083] In one embodiment, the first outer cover 24 and the first end cover 21 are detachably connected. For example, the first outer cover 24 and the first end cover 21 are connected by fasteners, which is easy to operate.

[0084] The specific type of the fastener is not limited, for example, the fastener may be a screw or a bolt.

[0085] For some examples, see Figure 5 The floating end assembly 20 includes an adhesive portion 25a, the adhesive portion 25a is bonded to the first outer cover 24 and the first end cover 21, and the adhesive portion 25a is located between two adjacent sealing rings 25. The adhesive portion 25a is used to apply sealant, and the sealant can seal the gap between the first outer cover 24 and the first end cover 21, further enhancing the sealing effect.

[0086] The specific type of the sealant is not limited, and may be, for example, KE45B sealant.

[0087] For some examples, see Figure 2 and Figure 6 The floating end assembly 20 includes a first outer sealing ring 26, and the first bearing 22 includes a first inner ring 222. The first outer sealing ring 26 and the first inner ring 222 are both sleeved outside the rotating shaft 10. The first outer sealing ring 26 abuts against the end surface of the first inner ring 222 facing the first side, and a labyrinth seal is formed between the first outer sealing ring 26 and the first outer cover 24.

[0088] The first outer sealing ring 26 and the first inner ring 222 can both rotate with the rotating shaft 10. For example, see Figure 2 The first outer sealing ring 26 shields at least part of the inlet and outlet of the first bearing chamber 21 b. The first outer sealing ring 26 can prevent impurities such as dust and water vapor from entering the first bearing chamber 21 b, thereby protecting the first bearing 22 and other components.

[0089] The first outer sealing ring 26 abuts against the end surface of the first inner ring 222 facing the first side, and the first outer sealing ring 26 provides support force for the first inner ring 222, thereby improving the stability of the first inner ring 222, so that the first inner ring 222 can rotate more smoothly and stably.

[0090] A labyrinth seal is formed between the first outer sealing ring 26 and the first outer cover 24. For example, see Figure 6 A plurality of grooves 24a are formed on one of the end faces of the first outer seal ring 26 facing the first outer cover 24 and the end faces of the first outer cover 24 facing the first outer seal ring 26, and a plurality of flanges are formed on the other of the end faces of the first outer seal ring 26 facing the first outer cover 24 and the end faces of the first outer cover 24 facing the first outer seal ring 26, and each flange is accommodated in the corresponding groove 24a. In this way, the plurality of flanges and the plurality of grooves 24a in a labyrinth structure can seal the gap between the first outer seal ring 26 and the first outer cover 24, further enhancing the sealing effect, and preventing the lubricating oil in the gear box from entering the first bearing chamber 21b through the gap.

[0091] It should be noted that, in the present application, the first side refers to the first side in the axial direction, the second side refers to the second side in the axial direction, and the first side and the second side are opposite sides.

[0092] In one embodiment, please refer to Figure 6 The first outer cover 24 is formed with an oil return hole 24b connected to the groove 24a, so that the lubricating oil that penetrates into the labyrinth structure can be discharged through the oil return hole 24b, for example, back to the gear box, preventing the lubricating oil from entering the first bearing chamber 21b.

[0093] For some examples, see Figure 2 The floating end assembly 20 includes a first sleeve 27, which is sleeved on the outside of the rotating shaft 10. The first sleeve 27 abuts against the end surface of the first inner ring 222 facing the second side, and a labyrinth seal is formed between the first sleeve 27 and the first inner sealing ring 23. The first sleeve 27 can rotate with the rotating shaft 10, and the first sleeve 27 abuts against the end surface of the first inner ring 222 facing the second side. The first sleeve 27 provides support force for the first inner ring 222, thereby further improving the stability of the first inner ring 222.

[0094] For example, please refer to Figure 2 Part of the first sleeve 27 is clamped between the first inner sealing ring 23 and the rotating shaft 10, and the other part of the first sleeve 27 is clamped between the first end cover 21 and the rotating shaft 10. In this way, the first inner sealing ring 23 and the first end cover 21 are separated from the rotating shaft 10 by the first sleeve 27, thereby reducing the wear of the first inner sealing ring 23 and the first end cover 21.

[0095] A labyrinth seal is formed between the first sleeve 27 and the first inner sealing ring 23 , and the connection method and beneficial effects of the two are the same as those of the labyrinth seal between the first outer sealing ring 26 and the first outer cover 24 , which will not be described in detail here.

[0096] In some embodiments, the first bearing 22 further includes a plurality of rolling elements and a retainer, the first outer ring 221 is sleeved outside the retainer, and the plurality of rolling elements are clamped between the first inner ring 222 and the retainer. The retainer is used to provide support force for the first outer ring 221 and the first inner ring 222, and can enhance the structural stability of the first bearing 22. The retainer can rotate with the bearing.

[0097] The specific material of the retainer is not limited. For example, the retainer can be made of brass, which has strong plasticity and is easy to process and shape.

[0098] The rolling element is used to reduce contact stress, that is, the sliding friction between the rolling element and the first inner ring 222 and the cage is converted into rolling friction, thereby reducing friction loss and extending the service life of the first bearing 22. The structural shape of the rolling element is not limited. For example, when the first bearing 22 is a NU bearing, the rolling element is cylindrical.

[0099] In this embodiment, by raising the position of the injection portion 23a, the length of the grease channel 21a is shortened, and the flow time of the grease in the grease channel 21a is reduced. The grease can contact the first outer ring 221, the first inner ring 222, the retaining frame and the rolling element more quickly, so that the first bearing 22 is fully and effectively lubricated, thereby improving the operating stability of the traction motor 100.

[0100] For some examples, see Figure 2 and Figure 8 The first end cover 21 is formed with a plurality of atmospheric channels 21d, at least one of which is connected to the first bearing chamber 21b and the outside atmosphere, and at least one of which is connected to the labyrinth structure between the first outer cover 24 and the first outer sealing ring 26 and the outside atmosphere. In other words, at least one atmospheric channel 21d is connected to the groove 24a and the outside atmosphere. In this way, the atmospheric channel 21d can prevent the formation of negative pressure in the first bearing chamber 21b, so as to keep the air pressure in the first bearing chamber 21b balanced with the outside atmosphere, so that the grease can flow more smoothly.

[0101] For some examples, see Figure 1 and Fig. 9 The traction motor 100 includes a positioning end assembly 30, which is arranged at one end of the rotating shaft 10 away from the floating end assembly 20. The positioning end assembly 30 includes a bearing seat 31, a second bearing 32, a third bearing 33 and a spacer sleeve 34. The bearing seat 31 forms a second bearing chamber 31a. The second bearing 32, the third bearing 33 and the spacer sleeve 34 are all arranged in the second bearing chamber 31a and sleeved outside the rotating shaft 10, wherein the second bearing 32 and the third bearing 33 are respectively assembled to the two sides of the spacer sleeve 34 along the axial direction from the first side and the second side.

[0102] See also Figure 1 The rotating shaft 10 also has a non-driving end 10b, which is axially located at a side away from the driving end 10a. The non-driving end 10b is used to connect to an external power source to transfer the electric energy of the external power source to the traction motor 100.

[0103] The positioning end assembly 30 is arranged at the non-transmission end 10b. The second bearing 32, the third bearing 33 and the spacer 34 are all sleeved outside the rotating shaft 10, and parts of the second bearing 32, the third bearing 33 and the spacer 34 can rotate around the rotating shaft 10. Exemplarily, the circumferential surface of the second bearing chamber 31a abuts against the circumferential surface of the second bearing 32 and the circumferential surface of the spacer 34, and the second bearing chamber 31a can provide support force for the second bearing 32 and the spacer 34 to improve the stability of the two, so that the rotating parts of the second bearing 32 and the spacer 34 can rotate more smoothly and stably.

[0104] The second bearing 32 is used to bear radial loads, and the third bearing 33 is used to bear axial loads. Thus, more rolling elements, such as steel balls, can be placed in the third bearing 33 , thereby increasing the bearing capacity of the positioning end assembly 30 .

[0105] Please continue reading Fig. 9 The second bearing 32 and the third bearing 33 are respectively located on both sides of the spacer sleeve 34 along the axial direction, that is, the spacer sleeve 34 separates the second bearing 32 and the third bearing 33, so that the second bearing 32 and the third bearing 33 operate in their own independent spaces without interfering with each other. The friction and wear between the second bearing 32 and the third bearing 33 can be reduced, and the service life of the positioning end assembly 30 can be improved.

[0106] The second bearing 32 and the third bearing 33 are respectively assembled to the two sides of the spacer sleeve 34 along the axial direction from the first side and the second side. That is, the second bearing 32 and the third bearing 33 are respectively assembled into the second bearing chamber 31a from two opposite directions of the spacer sleeve 34. In this way, the axial cumulative error can be reduced when the two bearings are installed from the same direction.

[0107] The axial cumulative error refers to the sum of the total tolerances generated by the second bearing 32, the third bearing 33 and the spacer sleeve 34 being connected in sequence along the axial direction.

[0108] The specific type of the second bearing 32 is not limited, for example, it can be a cylindrical roller bearing. The specific type of the third bearing 33 is not limited, for example, it can be a four-point contact ball bearing (QJ bearing).

[0109] It should be noted that the second bearing 32 and the third bearing 33 have a similar structure to the first bearing 22, that is, both include a retaining frame and rolling elements, and their beneficial effects are the same as those of the aforementioned first bearing 22, which will not be elaborated herein.

[0110] Taking the second bearing 32 as an NU bearing as an example, the rolling element of the second bearing 32 is cylindrical. Taking the third bearing 33 as a QJ bearing as an example, the rolling element of the third bearing 33 is spherical.

[0111] For some examples, see Fig. 9 and Fig.10, the second bearing 32 includes a second inner ring 322, the third bearing 33 includes a third inner ring 332, the diameter of the second inner ring 322 and the diameter of the spacer 34 are both larger than the diameter of the third inner ring 332, and the diameter of the second inner ring 322 is equal to the diameter of the spacer 34. In this way, part of the circumferential surface of the second bearing chamber 31a can protrude radially to form a boss 31a1, and the circumferential surface of the second bearing chamber 31a is generally in a step-shaped structure. In this way, in the process of assembling the positioning end assembly 30, the spacer 34 can be assembled into the second bearing chamber 31a from the first side, and the peripheral part of the spacer 34 abuts on the end surface of the boss 31a1 facing the first side, and then the second bearing 32 is assembled into the second bearing chamber 31a from the first side and abuts the spacer 34, and finally the third bearing 33 is assembled into the second bearing chamber 31a from the second side and abuts the spacer 34, which can reduce the assembly difficulty and improve the assembly efficiency on the basis of reducing the axial cumulative error.

[0112] For some examples, see Fig. 9 The positioning end assembly 30 includes a second outer sealing ring 35, which is arranged at one end of the third bearing 33 away from the spacer 34, and the second outer sealing ring 35 is connected to the bearing seat 31. The third outer ring 331 of the third bearing 33 is connected to the second outer sealing ring 35 by a pin.

[0113] For example, see Fig.10 The third bearing 33 includes a third inner ring 332 and a third outer ring 331. The third inner ring 332 is sleeved outside the rotating shaft 10, and the third outer ring 331 is sleeved outside the third inner ring 332. The third outer ring 331 and the third outer sealing ring are connected by a latch. In other words, the third inner ring 332 can rotate with the rotating shaft 10, and the third outer sealing ring is fixed and does not rotate with the rotating shaft 10. The third outer ring 331 and the third outer sealing ring are connected by a latch, which can prevent the third outer ring 331 from rotating with the rotating shaft 10.

[0114] In one embodiment, the second outer sealing ring 35 and the bearing seat 31 are detachably connected. Exemplarily, the second outer sealing ring 35 and the bearing seat 31 are connected by fasteners to facilitate assembly and disassembly.

[0115] For some examples, see Fig.11 The positioning end assembly 30 includes a sealing ring 41, which is sealed and clamped between the second outer sealing ring 35 and the bearing seat 31. In this way, the sealing ring 41 can seal the gap between the second outer sealing ring 35 and the bearing seat 31, and can prevent external dust, water vapor, etc. from entering the second bearing chamber 31a through the gap, thereby enhancing the protection of the second bearing 32, the third bearing 33 and other components.

[0116] The specific material of the sealing ring 41 is not limited, for example, it can be silicone rubber, polytetrafluoroethylene, etc.

[0117] In one embodiment, part of the space of the second bearing chamber 31a is defined as an installation chamber, the third bearing 33 is located in the installation chamber, and the length of the installation chamber along the axial direction is (mm), the axial length of the third bearing 33 is That is to say, the third bearing 33 will not protrude from the end surface of the bearing seat 31 connected to the second outer sealing ring 35. In this way, the second outer sealing ring 35 will not press the third bearing 33. The third bearing 33 has a certain movement space in the axial direction. In this way, a certain amount of heat energy will be generated during the operation of the traction motor 100, causing the rotating shaft 10 to undergo thermal expansion and axial deformation. The second outer ring 321 undergoes axial displacement due to the axial deformation of the rotating shaft 10, that is, the third bearing 33 can move in the movement space, thereby avoiding bearing additional axial loads.

[0118] For some examples, see Fig. 9 The bearing seat 31 is formed with a grease passage 31b, the spacer sleeve 34 is formed with two grease filling holes 34a connected to the grease passage 31b, the spacer sleeve 34 is formed with a partition 341, and the two grease filling holes 34a are respectively located on both sides of the partition 341 along the axial direction. The grease in the grease passage 31b enters the second bearing 32 through one of the grease filling holes 34a, and enters the third bearing 33 through the other grease filling hole 34a.

[0119] The grease passage 31b is used to circulate lubricating media such as grease. The grease can flow from the grease passage 31b to the two grease replenishing holes 34a, and flow to the second bearing 32 and the third bearing 33 through the two grease replenishing holes 34a, respectively, to replenish the grease and enhance the lubrication effect of the positioning end assembly 30.

[0120] For example, see Fig.10 The second outer ring 321 forms a partition 341 extending radially along the rotating shaft 10, and the partition 341 is used to separate the two grease filling holes 34a. In this way, the grease flowing out of the two grease filling holes 34a can flow into the second bearing 32 and the third bearing 33 respectively relatively evenly under the separation effect of the partition 341, thereby further enhancing the lubrication effect of the positioning end assembly 30.

[0121] For some examples, see Fig. 9 The positioning end assembly 30 includes a second sleeve 36 and a speed measuring toothed disc 37. The second sleeve 36 abuts against the end surface of the second inner ring 322 facing the first side and is sleeved outside the rotating shaft 10. The speed measuring toothed disc 37 abuts against the end surface of the third inner ring 332 facing the second side and is sleeved outside the rotating shaft 10. A labyrinth seal is formed between the speed measuring toothed disc 37 and the second outer sealing ring 35.

[0122] The speed measuring toothed disc 37 is used to measure the rotation speed of the rotating shaft 10. The second sleeve 36 and the speed measuring toothed disc 37 are both sleeved outside the rotating shaft 10, that is, the second sleeve 36 and the speed measuring toothed disc 37 can rotate with the rotating shaft 10. In addition, the second sleeve 36 abuts against the end face of the second inner ring 322, and the speed measuring toothed disc 37 abuts against the end face of the third inner ring 332. In this way, the second sleeve 36 provides support force for the second bearing 32, and the speed measuring toothed disc 37 provides support force for the third bearing 33. The second sleeve 36 and the speed measuring toothed disc 37 can improve the stability of the positioning end assembly 30, and can also achieve axial positioning of the second bearing 32, the third bearing 33 and the spacer 34.

[0123] A labyrinth seal is formed between the speed measuring toothed disc 37 and the second outer sealing ring 35 . The connection method and beneficial effects of the two are the same as those of the labyrinth seal between the first outer sealing ring 26 and the first outer cover 24 , and will not be described in detail here.

[0124] In one embodiment, the speed measuring toothed disc 37 and the rotating shaft 10 are connected by fasteners to facilitate assembly and disassembly.

[0125] For some examples, see Fig. 9 The positioning end assembly 30 includes an inner bearing cover 38, which is arranged on a side of the second bearing 32 axially away from the spacer sleeve 34, a portion of the inner bearing cover 38 is connected to the end surface of the bearing seat 31 facing the first side, and another portion of the inner bearing cover 38 abuts against the end surface of the second outer ring 321 facing the first side, and a labyrinth seal is formed between the inner bearing cover 38 and the second sleeve 36.

[0126] Exemplarily, the inner bearing cap 38 is pressed against the outer ring of the second bearing 32, and the inner bearing cap 38 provides a supporting force for the second bearing 32, which can improve the stability of the second bearing 32. In addition, through the supporting force provided by the inner bearing cap 38 to the second bearing 32, on the one hand, the spacer 34 can be pressed against the end surface of the boss 31a1 facing the first side, so as to achieve the axial positioning of the second outer ring 321 and the spacer 34. On the other hand, the axial cumulative error when the two bearings are installed from the same direction can be significantly reduced.

[0127] A labyrinth seal is formed between the inner bearing cap 38 and the second sleeve 36 . The connection method and beneficial effects of the two are the same as those of the labyrinth seal between the first outer sealing ring 26 and the first outer cover 24 , and will not be described in detail here.

[0128] In one embodiment, the inner bearing cover 38 and the bearing seat 31 are detachably connected. Exemplarily, the inner bearing cover 38 and the bearing seat 31 are connected by fasteners to facilitate loading and unloading.

[0129] For some examples, see Fig. 9The positioning end assembly 30 includes a second end cover 39 and a second outer cover 40. The bearing seat 31 is fixed to the second end cover 39. The second outer cover 40 is connected to the end surface of the second end cover 39 facing the second side. The first end cover 21 and the second outer cover 40 can prevent dust, water vapor, etc. from entering the traction motor 100, and play a good role in protecting the components in the traction motor 100, such as bearings, rotors, and stators. In this way, the second end cover 39 and the second outer cover 40 can further enhance the protection of the second bearing 32, the third bearing 33 and other components. The second end cover 39 can also improve the structural stability of the traction motor 100.

[0130] In one embodiment, the bearing seat 31 and the second end cover 39 are detachably connected. Exemplarily, the bearing seat 31 and the second end cover 39 are connected by fasteners to facilitate loading and unloading.

[0131] In the description of this specification, the description with reference to the terms "an embodiment", "some embodiments" and "exemplary" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0132] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction. The above description is only a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A traction motor, characterized in that: include: Rotating shaft; A floating end assembly comprises a first end cover, a first bearing and a first inner sealing ring, wherein the first inner sealing ring comprises an injection portion, and the first end cover is formed with a grease passage and a first bearing chamber; the first bearing is arranged in the first bearing chamber and sleeved outside the rotating shaft, the first inner sealing ring is arranged in the first bearing chamber, the central axis of the first inner sealing ring is higher than the central axis of the rotating shaft, the injection portion is located above the central axis of the first inner sealing ring, and the grease passage is communicated with the injection portion.

2. The traction motor according to claim 1, characterized in that: The first bearing chamber includes a first circumferential surface and a second circumferential surface, the first inner sealing ring includes a third circumferential surface, and the third circumferential surface forms a guide groove that penetrates axially; the first bearing includes a first outer ring, the circumferential surface of the first outer ring abuts the first circumferential surface, the third circumferential surface abuts the second circumferential surface, and the guide groove is connected to the injection part.

3. The traction motor according to claim 2, characterized in that: The diameter of the first outer ring is greater than the diameter of the first inner sealing ring.

4. The traction motor according to claim 2, characterized in that: The first bearing chamber includes a first end face, the first end face faces the first inner sealing ring and is connected to the second circumferential surface, the connection between the first end face and the second circumferential surface forms a first transition portion, the first inner sealing ring includes a second end face connected to the third circumferential surface, the second end face abuts the first end face, the connection between the second end face and the third circumferential surface forms a second transition portion, the first transition portion and the second transition portion jointly define a storage space, and the guide groove is connected to the storage space.

5. The traction motor according to claim 4, characterized in that: The first inner sealing ring abuts against the first outer ring to form a lubrication space. The first inner sealing ring forms an oil inlet hole, and the oil inlet hole communicates the storage space and the lubrication space.

6. The traction motor according to claim 1, characterized in that: The floating end assembly includes a first outer cover and a plurality of sealing rings. The first outer cover is arranged on a side of the first bearing away from the first inner sealing ring. The first outer cover is connected to the first end cover. The sealing ring is sealingly clamped between the first outer cover and the first end cover. The plurality of sealing rings are radially spaced apart.

7. The traction motor according to claim 6, characterized in that: The floating end assembly includes an adhesive portion, the adhesive portion is bonded to the first outer cover and the first end cover, and the adhesive portion is located between two adjacent sealing rings.

8. The traction motor according to claim 6, characterized in that: The floating end assembly includes a first outer sealing ring, the first bearing includes a first inner ring, the first outer sealing ring and the first inner ring are both sleeved outside the rotating shaft, the first outer sealing ring abuts against the end surface of the first inner ring facing the first side, and a labyrinth seal is formed between the first outer sealing ring and the first outer cover.

9. The traction motor according to claim 1, characterized in that: The floating end assembly includes a first sleeve, the first bearing includes a first inner ring, the first sleeve and the first inner ring are both sleeved outside the rotating shaft, the first sleeve abuts against the end surface of the first inner ring facing the second side, and a labyrinth seal is formed between the first sleeve and the first inner sealing ring.

10. The traction motor according to any one of claims 1 to 9, characterized in that: The traction motor includes a positioning end assembly, which is arranged at one end of the rotating shaft away from the floating end assembly. The positioning end assembly includes a bearing seat, a second bearing, a third bearing and a spacer sleeve. The bearing seat forms a second bearing chamber, and the second bearing, the third bearing and the spacer sleeve are all arranged in the second bearing chamber and sleeved outside the rotating shaft, wherein the second bearing and the third bearing are respectively assembled to both sides of the spacer sleeve along the axial direction from the first side and the second side.

11. The traction motor according to claim 10, characterized in that: The positioning end assembly includes a second outer sealing ring, which is arranged at an end of the third bearing away from the spacer sleeve, the second outer sealing ring is connected to the bearing seat, and the third outer ring 331 of the third bearing and the second outer sealing ring are connected by a pin.

12. The traction motor according to claim 10, characterized in that: The bearing seat is formed with a grease passage, the spacer sleeve is formed with two grease filling holes connected to the grease passage, the spacer sleeve is formed with a partition, the two grease filling holes are respectively located on both sides of the partition along the axial direction, and the grease in the grease passage enters the second bearing through one of the grease filling holes and enters the third bearing through the other grease filling hole.

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