A kind of drive motor and the wheel edge electric drive system of integrated emergency steering function

Abstract

The application discloses a driving motor, which comprises a motor shell, a stator assembly fixed in the motor shell, and a rotor assembly rotatably arranged in the stator assembly. The rotor assembly comprises a rotor support and a rotor core assembly. The rotor support is rotatably installed on the motor shell. A radial plunger pump is coaxially arranged in the rotor support. A camshaft of the radial plunger pump is in transmission connection with the rotor support. The radial plunger pump is fixedly connected with the motor shell at an end away from the camshaft. The radial plunger pump is provided with an oil inlet channel and an oil outlet channel. The motor shell is provided with an oil inlet port and an oil outlet port. The oil inlet port and the oil outlet port are respectively in communication with the oil inlet channel and the oil outlet channel. The application further discloses a wheel edge electric driving system integrated with an emergency steering function and using the driving motor. The application aims to provide a driving motor and a wheel edge electric driving system integrated with an emergency steering function, so that the vehicle can have the steering function when the main loop of the vehicle steering hydraulic system fails.

Description

Technical Field

[0001] This invention relates to the field of electric drive vehicles, and in particular to a drive motor and a wheel-side electric drive system with integrated emergency steering function. Background Technology

[0002] To achieve the national dual-carbon goals as soon as possible and ensure energy security, multi-axle drive heavy-duty off-road vehicles are gradually becoming electrified, and their drive systems currently mostly adopt distributed wheel-side electric drive solutions. In order to improve the vehicle's passability and increase the suspension travel, the length of the wheel-side drive shaft is often extended as much as possible, and the wheel-side motors are generally installed back-to-back symmetrically. The emergency steering pump, which is originally installed on the intermediate shaft of the transfer case and is synchronized with the rotation of the wheels, cannot be installed on the periphery of the drive system.

[0003] The absence of an emergency steering device will cause the vehicle to lose steering function when the main circuit of the steering hydraulic system fails, seriously affecting driving safety. According to standards such as GB 17675-2021 "Basic Requirements for Automotive Steering Systems" and GB 38032-2020 "Safety Requirements for Electric Buses," steering force requirements exist for vehicles in the event of any transmission failure other than mechanical transmission mechanisms. Furthermore, electric buses, "in the event of an abnormal situation requiring the entire vehicle to disconnect from Class B high-voltage power during operation, should maintain power steering or at least maintain power steering for 30 seconds at speeds greater than 5 km / h." The steering system should be equipped with emergency measures to meet safe driving requirements under fault conditions.

[0004] Currently, new energy vehicles mainly use high and low voltage redundancy measures to achieve emergency steering functions, but they cannot meet the emergency steering needs when both high and low voltage fail in long-term and long-distance scenarios such as going down long slopes or emergency towing. Once this happens, it will seriously endanger the safety of people's lives and property. Summary of the Invention

[0005] The purpose of this invention is to provide a drive motor and a wheel-side electric drive system with integrated emergency steering function. This system solves the problem of wheel-side electric drive systems lacking emergency steering function, ensures redundant design of the vehicle steering system, and incorporates an emergency steering pump within the drive motor cavity without occupying external space. The emergency steering pump takes power from the motor rotor and rotates synchronously with the wheels, enabling the vehicle to maintain steering function even when the main circuit of the vehicle steering hydraulic system fails.

[0006] The drive motor of this invention includes a motor housing, a stator assembly fixedly disposed within the motor housing, a rotor assembly rotatably disposed within the stator assembly, the rotor assembly including a rotor support and a rotor core assembly disposed outside the rotor support, the rotor support being rotatably mounted on the motor housing, a radial piston pump coaxially disposed within the rotor support, the camshaft of the radial piston pump being drively connected to the rotor support, the end of the radial piston pump away from the camshaft passing through the rotor support and being fixedly connected to the motor housing, the end of the radial piston pump away from the camshaft being provided with an oil inlet passage and an oil outlet passage, the motor housing being provided with an oil inlet port and an oil outlet port, the oil inlet port communicating with the oil inlet passage, and the oil outlet port communicating with the oil outlet passage.

[0007] The drive motor of the present invention includes a motor housing comprising a housing body, an output end cover, and a non-output end cover. The housing body is cylindrical and has a water jacket assembly. The output end cover and the non-output end cover are fixedly installed at both ends of the housing body, respectively. A stator assembly is fixedly installed inside the housing body. The two ends of the rotor support are the rotor output end and the rotor non-output end, respectively. The rotor output end and the rotor non-output end of the rotor support are rotatably mounted on the output end cover and the non-output end cover, respectively. The camshaft of the radial piston pump is drivenly connected to the rotor output end of the rotor support. The end of the radial piston pump away from the camshaft passes through the rotor non-output end of the rotor support and is fixedly connected to the non-output end cover. The non-output end cover is provided with an oil inlet and an oil outlet.

[0008] In the drive motor of the present invention, the stator assembly is cylindrical, the outer cylindrical wall of the stator assembly is fixedly connected to the inner cylindrical wall of the housing body, and the stator assembly and the housing body are arranged coaxially.

[0009] The drive motor of the present invention includes a rotor support comprising a support body, an output rotor flange, and a non-output rotor flange. The support body is cylindrical, and a rotor core assembly is provided on the outer wall of the support body. The support body and the stator assembly are arranged coaxially. The output rotor flange and the non-output rotor flange are coaxially fixedly installed at both ends of the support body, respectively. The output rotor flange and the non-output rotor flange are the rotor output end and rotor non-output end of the rotor support, respectively. The radial plunger pump is disposed in the cavity formed by the support body, the output rotor flange, and the non-output rotor flange. The radial plunger pump is coaxially arranged with the support body, the output rotor flange, and the non-output rotor flange.

[0010] In the drive motor of the present invention, an output shaft is coaxially fixed on the outside of the output end rotor flange. The output shaft is rotatably mounted on the output end cover through an output end bearing. The end of the output shaft away from the output end rotor flange extends through the output end cover to the outside of the output end cover. A first annular flange is coaxially fixed on the inside of the output end rotor flange. The camshaft of the radial piston pump is inserted into the first annular flange and is drivenly connected to the first annular flange.

[0011] In the drive motor of the present invention, the camshaft of the radial piston pump is connected to the first annular flange by a spline, and a first oil seal is provided between the end of the radial piston pump near the camshaft and the outer peripheral wall of the first annular flange.

[0012] In the drive motor of the present invention, a second annular flange is coaxially fixed on the outer side of the non-output end rotor flange. The second annular flange is rotatably mounted on the non-output end cover through a non-output end bearing. The end of the radial piston pump away from the camshaft passes through the second annular flange and is fixedly connected to the non-output end cover.

[0013] In the drive motor of the present invention, the non-output end cover is provided with a non-output end mounting hole, the second annular flange is inserted into the non-output end mounting hole, the second annular flange is rotatably mounted on the hole wall of the non-output end mounting hole through a non-output end bearing, an adapter plate is fixedly provided at the non-output end mounting hole on the outside of the non-output end cover, the adapter plate is provided with an oil inlet and an oil outlet, and the end of the radial plunger pump away from the camshaft passes through the second annular flange and is fixedly connected to the adapter plate.

[0014] The drive motor of the present invention includes a resolver assembly between the motor housing and the rotor assembly. The resolver assembly includes a resolver stator and a resolver rotor. The resolver stator is fixed on the wall of the non-output end mounting hole of the non-output end cover, and the resolver rotor is fixed on the second annular flange.

[0015] The wheel-side electric drive system with integrated emergency steering function in this invention includes the aforementioned drive motor, wheel-side drive shaft and wheel-side reducer. A flange fork is fixedly installed on the output shaft. A second oil seal is provided between the flange fork and the output end cover. The flange fork is fixedly connected to one end of the wheel-side drive shaft, and the other end of the wheel-side drive shaft is fixedly connected to the wheel-side reducer.

[0016] The difference between the drive motor and wheel-side electric drive system with integrated emergency steering function of this invention and the prior art is that this invention sets a cavity in the rotor bracket and arranges the emergency steering pump, i.e., the radial piston pump, in the rotor bracket. The camshaft of the radial piston pump is driven by the rotor bracket. The end of the radial piston pump away from the camshaft passes through the rotor bracket and is fixedly connected to the motor housing. In this way, when the drive motor drives the vehicle to move, the rotor bracket drives the vehicle wheels to rotate at the same time (the rotor bracket drives the vehicle wheels to rotate through the flange fork, wheel-side drive shaft and wheel-side reducer), and can also drive the camshaft of the radial piston pump to rotate. The camshaft then drives the piston assembly of the radial piston pump to reciprocate, so that the working chamber volume of the radial piston pump changes, thereby realizing oil suction and oil pumping. Of course, in the use of this invention, the radial piston pump is connected to the vehicle's steering hydraulic system. When the vehicle is in motion and the steering hydraulic main circuit is effective, the radial piston pump draws oil from the tank and then pumps the oil back to the tank. When the vehicle is in motion and the steering hydraulic main circuit fails, the control mechanism connects the radial piston pump to the steering hydraulic system. At this time, the radial piston pump draws oil from the tank and pumps the oil into the hydraulic steering components to achieve vehicle steering. It can be seen that this invention solves the problem of the lack of emergency steering function in wheel-side electric drive systems, ensures redundant design of the vehicle steering system, and designs an emergency steering pump inside the drive motor cavity, without occupying external space. The emergency steering pump takes power from the motor rotor and rotates synchronously with the wheels, enabling the vehicle to maintain steering function even when the main circuit of the vehicle's steering hydraulic system fails.

[0017] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wheel-side electric drive system integrating emergency steering function in this invention; Figure 2 This is a schematic diagram of the non-output terminal of the drive motor in this invention; Figure 3 For along Figure 2 Sectional view of line AA in the middle; Figure 4 This is a schematic diagram of the radial piston pump mounted on the rotor assembly in this invention; Figure 5 This is a schematic diagram of the radial piston pump in this invention.

[0019] Figure reference numerals: 01. Drive motor; 02. Wheel-side drive shaft; 03. Wheel-side reducer; 04. Oil inlet; 05. Oil outlet; 06. Third bolt; 07. Non-output end cover; 08. Housing body; 09. Stator assembly; 10. Rotor core assembly; 11. Support body; 12. First annular flange; 13. Output end cover; 14. Output rotor flange; 15. Output mounting hole; 16. Flange fork; 17. Lock nut; 18. Output shaft; 19. Small diameter shaft ; 20. Large diameter shaft; 21. Second oil seal; 22. Output end bearing; 23. First oil seal; 24. Camshaft; 25. Radial piston pump; 26. Non-output end bearing; 27. Resolver assembly; 28. Adapter plate; 29. ​​Second annular flange; 30. Non-output end mounting hole; 31. Non-output end rotor flange; 32. Input end cover; 33. Pump body; 34. Non-input end cover; 35. Plug; 36. Piston spring; 37. Piston; 38. Second bolt. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] like Figure 2 , 3 As shown, and in combination Figure 1 , 4 As shown in Figure 5, the drive motor 01 of the present invention includes a motor housing. A stator assembly 09 is fixedly disposed inside the motor housing. A rotor assembly is rotatably disposed inside the stator assembly 09. The rotor assembly includes a rotor support and a rotor core assembly 10 disposed outside the rotor support. The rotor support is rotatably mounted on the motor housing. A radial piston pump 25 is coaxially disposed inside the rotor support. The camshaft 24 of the radial piston pump 25 is drivenly connected to the rotor support. The end of the radial piston pump 25 away from the camshaft 24 passes through the rotor support and is fixedly connected to the motor housing. The end of the radial piston pump 25 away from the camshaft 24 is provided with an oil inlet passage and an oil outlet passage. An oil inlet 04 and an oil outlet 05 are provided on the motor housing. The oil inlet 04 is connected to the oil inlet passage, and the oil outlet 05 is connected to the oil outlet passage.

[0022] The radial piston pump 25 is existing technology. It has a camshaft 24. When the camshaft 24 rotates, it drives the piston 37 assembly of the pump to reciprocate, causing a change in the volume of the pump's working chamber, thereby achieving oil suction and pumping. When the piston 37 moves outward from the pump, a negative pressure is formed in the working chamber, and oil enters the working chamber, achieving oil suction. Conversely, when the piston 37 moves inward from the pump, a high pressure is formed in the working chamber, and oil flows out of the working chamber, achieving oil pumping. In this way, the radial piston pump 25 can provide an emergency steering power oil source for the vehicle's steering system.

[0023] like Figure 2 , 3 As shown in Figure 4, the drive motor 01 of the present invention includes a housing body 08, an output end cover 13, and a non-output end cover 07. The housing body 08 is cylindrical and has a water jacket assembly. The output end cover 13 and the non-output end cover 07 are fixedly installed at both ends of the housing body 08, respectively. A stator assembly 09 is fixedly installed inside the housing body 08. The two ends of the rotor support are the rotor output end and the rotor non-output end, respectively. The rotor output end and the rotor non-output end of the rotor support are rotatably mounted on the output end cover 13 and the non-output end cover 07, respectively. The camshaft 24 of the radial piston pump 25 is drivenly connected to the rotor output end of the rotor support. The end of the radial piston pump 25 away from the camshaft 24 passes through the rotor non-output end of the rotor support and is fixedly connected to the non-output end cover 07. The non-output end cover 07 is provided with an oil inlet 04 and an oil outlet 05.

[0024] The water jacket assembly is existing technology, which means that water channels are provided inside the cylindrical wall of the housing body 08, and cooling water flows through the water channels to cool the drive motor 01. The output end cover 13 and the non-output end cover 07 are respectively fixedly installed on the two openings of the housing body 08.

[0025] like Figure 3 As shown, in the drive motor 01 of the present invention, the stator assembly 09 is cylindrical, the outer wall of the stator assembly 09 is fixedly connected to the inner wall of the housing body 08, and the stator assembly 09 and the housing body 08 are arranged coaxially.

[0026] like Figure 3 , 4 As shown, the drive motor 01 of the present invention includes a rotor support comprising a support body 11, an output rotor flange 14, and a non-output rotor flange 31. The support body 11 is cylindrical, and a rotor core assembly 10 is provided on the outer wall of the support body 11. The support body 11 and the stator assembly 09 are arranged coaxially. The output rotor flange 14 and the non-output rotor flange 31 are coaxially fixedly installed at both ends of the support body 11, respectively. The output rotor flange 14 and the non-output rotor flange 31 are the rotor output end and the rotor non-output end of the rotor support, respectively. The radial plunger pump 25 is disposed in the cavity formed by the support body 11, the output rotor flange 14, and the non-output rotor flange 31. The radial plunger pump 25 is coaxially arranged with the support body 11, the output rotor flange 14, and the non-output rotor flange 31.

[0027] The output rotor flange 14 and the non-output rotor flange 31 are respectively fixedly installed on the two cylinder openings of the bracket body 11. Since the output rotor flange 14 and the non-output rotor flange 31 are the rotor output end and rotor non-output end of the rotor bracket, respectively, the output rotor flange 14 and the non-output rotor flange 31 are rotatably installed on the output end cover 13 and the non-output end cover 07, respectively. The camshaft 24 of the radial piston pump 25 is drivenly connected to the output rotor flange 14 of the rotor bracket. The end of the radial piston pump 25 away from the camshaft 24 passes through the non-output rotor flange 31 of the rotor bracket and is fixedly connected to the non-output end cover 07.

[0028] The radial piston pump 25 is coaxially arranged with the support body 11, the output rotor flange 14, and the non-output rotor flange 31, thus achieving the aforementioned purpose of the radial piston pump 25 being coaxial with the rotor support.

[0029] like Figure 3 , 4 As shown, in the drive motor 01 of this invention, an output shaft 18 is coaxially fixed on the outer side of the output rotor flange 14. The output shaft 18 is rotatably mounted on the output end cover 13 via an output end bearing 22. In other words, the output rotor flange 14 is rotatably mounted on the output end cover 13 via the output shaft 18 and the output end bearing 22. The end of the output shaft 18 away from the output rotor flange 14 extends through the output end cover 13 to the outer side of the output end cover 13. A first annular flange 12 is coaxially fixed on the inner side of the output rotor flange 14. The camshaft 24 of the radial piston pump 25 is inserted into the first annular flange 12 and is drive-connected to the first annular flange 12. In other words, the camshaft 24 of the radial piston pump 25 is drive-connected to the output rotor flange 14 via the first annular flange 12, i.e., drive-connected to the rotor support.

[0030] The output shaft 18 is fixedly disposed at the center hole on the outside of the output rotor flange 14 and is integrally formed with the output rotor flange 14. The first annular flange 12 is cylindrical and is fixedly disposed at the center hole on the inside of the output rotor flange 14 and is also integrally formed with the output rotor flange 14. The cylindrical cavity of the first annular flange 12 is the center hole of the output rotor flange 14. In this embodiment, the camshaft 24 of the radial piston pump 25 is connected to the first annular flange 12 by a spline, specifically: the camshaft 24 is connected to the inner spline of the first annular flange 12 by an involute external spline.

[0031] like Figure 3 , 4 As shown, a first oil seal 23 is provided between the end of the radial piston pump 25 near the camshaft 24 and the outer peripheral wall of the first annular flange 12. (Combined) Figure 5As shown, the radial piston pump 25 is prior art, comprising a pump body 33. An input end cover 32 and a non-input end cover 34 are fixedly mounted at both ends of the pump body 33. A camshaft 24 inside the pump body 33 extends through the input end cover 32 to the outside of the input end cover 32. From the inside out, the pump body 33 is provided with a piston 37, a piston spring 36, and a plug 35. The non-input end cover 34 is provided with an oil inlet passage and an oil outlet passage, which communicate with the working chamber inside the pump body 33. It should be noted that... Figure 3 , 4 The non-input end cap 34 of the radial piston pump 25 shown is cylindrical, which is relative to Figure 5 The non-input end cap 34 is stretched to allow it to be mounted on the rotor support. The end of the radial piston pump 25 near the camshaft 24 refers to the input end cap 32. A first oil seal 23 is provided between the input end cap 32 and the outer peripheral wall of the first annular flange 12 for sealing and lubrication. The outer peripheral wall of the first annular flange 12 is induction hardened to approximately HRC55 to meet wear resistance requirements.

[0032] like Figure 3 , 4 As shown, in the drive motor 01 of the present invention, a second annular flange 29 is coaxially fixed on the outer side of the non-output end rotor flange 31. The second annular flange 29 is rotatably mounted on the non-output end cover 07 through the non-output end bearing 26. The end of the radial piston pump 25 away from the camshaft 24 passes through the second annular flange 29 and is fixedly connected to the non-output end cover 07.

[0033] In the drive motor 01 of the present invention, the non-output end cover 07 is provided with a non-output end mounting hole 30, the second annular flange 29 is inserted into the non-output end mounting hole 30, and the second annular flange 29 is rotatably mounted on the hole wall of the non-output end mounting hole 30 through the non-output end bearing 26. A transition plate 28 is fixedly provided at the non-output end mounting hole 30 on the outside of the non-output end cover 07. The transition plate 28 is provided with an oil inlet 04 and an oil outlet 05. The end of the radial plunger pump 25 away from the camshaft 24 passes through the second annular flange 29 and is fixedly connected to the transition plate 28.

[0034] The second annular flange 29 is cylindrical and is fixedly located at the center hole on the outside of the non-output end rotor flange 31. It is integrally formed with the non-output end rotor flange 31, and the cylindrical cavity of the second annular flange 29 is the center hole of the non-output end rotor flange 31. In other words, the non-output end rotor flange 31 is rotatably mounted on the non-output end cover 07 via the second annular flange 29 and the non-output end bearing 26.

[0035] Since the second annular flange 29 is fixed on the non-output end rotor flange 31, it can also be said that the end of the radial piston pump 25 that is away from the camshaft 24 that passes through the second annular flange 29 is considered to pass through the non-output end rotor flange 31.

[0036] Since the adapter plate 28 is fixedly mounted on the non-output end cover 07, the adapter plate 28 can be regarded as part of the non-output end cover 07. Therefore, the oil inlet 04 and oil outlet 05 on the adapter plate 28 can be regarded as the oil inlet 04 and oil outlet 05 on the non-output end cover 07. The end of the radial piston pump 25 away from the camshaft 24 passes through the second annular flange 29 and is fixedly connected to the adapter plate 28, which can be regarded as the fixed connection to the non-output end cover 07.

[0037] like Figure 5 As shown, the end of the radial piston pump 25 away from the camshaft 24 refers to the non-input end cover 34. The non-input end cover 34 passes through the second annular flange 29 and is fixedly connected to the adapter plate 28. The oil inlet 04 on the adapter plate 28 is connected to the oil inlet channel on the non-input end cover 34, and the oil outlet 05 on the adapter plate 28 is connected to the oil outlet channel on the non-input end cover 34.

[0038] like Figure 3 As shown, the drive motor 01 of the present invention has a resolver assembly 27 between the motor housing and the rotor assembly. The resolver assembly 27 includes a resolver stator and a resolver rotor. The resolver stator is fixed on the wall of the non-output end mounting hole 30 of the non-output end cover 07, and the resolver rotor is fixed on the second annular flange 29.

[0039] The resolver assembly 27 is existing technology, and its specific structure and working principle will not be described in detail. Since the second annular flange 29 is fixed on the non-output end rotor flange 31, the second annular flange 29 can be regarded as part of the non-output end rotor flange 31. Thus, the resolver stator fixed on the wall of the non-output end mounting hole 30 of the non-output end cover 07 and the resolver rotor fixed on the second annular flange 29 can be regarded as the resolver assembly 27 being located between the motor housing and the rotor assembly.

[0040] like Figure 1 As shown, and in combination Figure 3 As shown, the wheel-side electric drive system with integrated emergency steering function in this invention includes the aforementioned drive motor 01, wheel-side drive shaft 02, and wheel-side reducer 03. A flange fork 16 is fixedly installed on the output shaft 18. A second oil seal 21 is provided between the flange fork 16 and the output end cover 13. The flange fork 16 is fixedly connected to one end of the wheel-side drive shaft 02, and the other end of the wheel-side drive shaft 02 is fixedly connected to the wheel-side reducer 03.

[0041] The flange fork 16 is an existing structure, which is sleeved on the end of the output shaft 18 away from the output rotor flange 14 and fixed by the lock nut 17. Specifically, the output end cover 13 has an output end mounting hole 15, and the end of the output shaft 18 away from the output rotor flange 14 extends through the output end mounting hole 15 to the outside of the output end cover 13. The output shaft 18 is a variable diameter shaft, with the end near the output rotor flange 14 being a large diameter shaft 20 and the end away from the output rotor flange 14 being a small diameter shaft 19, forming a step between them. The inner ring of the output end bearing 22 is fixedly sleeved on the large diameter shaft 20, and the outer ring of the output end bearing 22 is fixed to the hole wall of the output end mounting hole 15. In this way, the output rotor flange 14 is rotatably mounted on the output end cover 13 through the output shaft 18 and the output end bearing 22. The flange fork 16 is fitted onto the minor diameter shaft 19. One end of the flange fork 16 abuts against the step between the major and minor diameter shafts 19 of the output shaft 18, and the other end abuts against the locking nut 17 threaded onto the output shaft 18. In this way, the flange fork 16 is fixed to the output shaft 18. A second oil seal 21 is provided between the flange fork 16 and the wall of the output end mounting hole 15 of the output end cover 13, which serves as a sealing and lubrication function.

[0042] The aforementioned wheel-side electric drive system is fixedly mounted on the vehicle to drive it. Specifically, the wheel-side reducer 03 is fixedly connected to the wheel. When the rotor assembly of the drive motor 01 rotates, the rotor support rotates relative to the stator assembly 09 and the motor housing via the output bearing 22 and the non-output bearing 26 (i.e., the support body 11, the output rotor flange 14, and the non-output rotor flange 31 rotate simultaneously). The rotor core assembly 10 rotates along with the rotor support. Since the non-input end cover 34 of the radial piston pump 25 is fixedly connected to the adapter plate 28 after passing through the second annular flange 29, and the adapter plate 28 is fixed to the non-output end cover 07 of the motor housing, the non-input end cover 34, the pump body 33, and the input end cover 32 of the radial piston pump 25 do not rotate with the rotor assembly. The second annular flange 29 rotates along with the non-output rotor flange 31, meaning both rotate around the non-input end cover 34 of the radial piston pump 25. When the output rotor flange 14 rotates, it produces two results: First, the output shaft 18 rotates together with the output rotor flange 14, and the flange fork 16 rotates together with the output shaft 18. Thus, the flange fork 16 can drive the wheel-side reducer 03 to rotate through the wheel-side drive shaft 02, thereby driving the wheel to rotate and enabling the vehicle to move. Second, the first annular flange 12 rotates together with the output rotor flange 14. Since the first annular flange 12 is connected to the camshaft 24 of the radial piston pump 25, the camshaft 24 rotates together with the first annular flange 12. In this way, the camshaft 24 can drive the piston 37 assembly of the radial piston pump 25 to reciprocate, causing the working chamber volume of the pump to change, thereby realizing oil suction and oil pumping.

[0043] The difference between the drive motor and wheel-side electric drive system with integrated emergency steering function of this invention and the prior art is that this invention sets a cavity in the rotor bracket and arranges the emergency steering pump, i.e., the radial plunger pump 25, in the rotor bracket. The camshaft 24 of the radial plunger pump 25 is connected to the rotor bracket for transmission. The end of the radial plunger pump 25 away from the camshaft 24 passes through the rotor bracket and is fixedly connected to the motor housing. In this way, when the drive motor 01 drives the vehicle to move, the rotor bracket drives the vehicle wheels to rotate at the same time (the rotor bracket drives the vehicle wheels to rotate through the flange fork 16, the wheel-side drive shaft 02 and the wheel-side reducer 03), and can also drive the camshaft 24 of the radial plunger pump 25 to rotate. The camshaft 24 then drives the plunger 37 assembly of the radial plunger pump 25 to reciprocate, so that the working chamber volume of the radial plunger pump 25 changes, thereby realizing oil suction and oil pumping. Of course, in use, the radial piston pump 25 is connected to the vehicle's steering hydraulic system. When the vehicle is in motion and the steering hydraulic main circuit is effective, the radial piston pump 25 draws oil from the tank and then pumps the oil back to the tank. When the vehicle is in motion and the steering hydraulic main circuit fails, the control mechanism connects the radial piston pump 25 to the steering hydraulic system. At this time, the radial piston pump 25 draws oil from the tank and pumps the oil into the hydraulic steering components to achieve vehicle steering. It can be seen that this invention solves the problem of the wheel-side electric drive system lacking emergency steering function, ensures redundant design of the vehicle steering system, and designs an emergency steering pump inside the drive motor 01 cavity, without occupying external space. The emergency steering pump takes power from the motor rotor and rotates synchronously with the wheels, enabling the vehicle to maintain steering function even when the main circuit of the vehicle's steering hydraulic system fails.

[0044] Since the camshaft 24 is connected to the first annular flange 12 via a spline, the camshaft 24 and the first annular flange 12 are coaxially arranged. The first annular flange 12 is coaxial with the output rotor flange 14, which in turn is coaxial with the support body 11 and the non-output rotor flange 31. Therefore, the camshaft 24 is coaxially arranged with the entire rotor support. Thus, when the rotor support rotates, the camshaft 24 can also rotate along with the output rotor flange 14 via the first annular flange 12, i.e., it rotates along with the rotor support. In other words, the camshaft 24 takes power from the output rotor flange 14 of the rotor support.

[0045] The second annular flange 29 is coaxial with the non-output rotor flange 31, that is, coaxial with the rotor support. The non-input end cover 34 of the radial piston pump 25 extends through the second annular flange 29, that is, the two are also arranged coaxially. In other words, the non-input end of the radial piston pump 25 is coaxial with the rotor support.

[0046] It can be seen that the camshaft 24 and the non-input end cover 34 of the radial piston pump 25 are both coaxial with the rotor support, that is, both ends of the radial piston pump 25 are coaxial with the rotor support, so the entire radial piston pump 25 is also arranged coaxially with the rotor support.

[0047] The output shaft 18 is coaxial with the output end rotor flange 14, that is, coaxial with the rotor support. So when the rotor support rotates, it can also drive the output shaft 18 to rotate around its own axis / rotor support axis.

[0048] The wheel-side electric drive system consists of a drive motor 01, a wheel-side drive shaft 02, and a wheel-side reducer 03. Power from the drive motor 01 is transmitted to the wheel-side drive shaft 02, which has a universal joint, via a flange fork 16 connected to the rotor support. The universal joint accommodates wheel movement and allows the included angle of the wheel-side drive shaft 02 to vary within a certain range. The wheel-side drive shaft 02 then transmits power to the sun gear of the wheel-side reducer 03. The wheel-side reducer 03 is an NGW (Next Generation Wheel) planetary gear set. Finally, the power is transmitted to the wheel via the planetary gear carrier through the reduction and torque amplification effect of the wheel-side reducer 03. During this process, the rotor support, wheel-side drive shaft 02, and wheel-side reducer 03 rotate synchronously with the wheel.

[0049] The drive motor 01 is an internal rotor permanent magnet synchronous motor. The drive motor 01 is designed with a split hollow rotor assembly, that is, the rotor assembly consists of a rotor support and a rotor core assembly 10. The rotor support consists of a support body 11, an output rotor flange 14, and a non-output rotor flange 31. The support body 11, the output rotor flange 14, and the non-output rotor flange 31 together form a cavity to accommodate the emergency steering pump (radial piston pump 25), and the emergency steering pump is installed in the cavity.

[0050] The stator assembly 09 is interference-fitted to the housing body 08 of the motor housing. The stator assembly 09 contains three-phase windings and receives alternating current from the inverter, thereby forming an alternating magnetic field inside the drive motor 01. The rotor assembly has built-in permanent magnets that rotate and output power under the action of the alternating magnetic field. The resolver assembly 27 provides position signals to the motor controller, which can perform servo control on the drive motor 01.

[0051] The rotor core assembly 10 is interference-fitted to the rotor support. The output rotor flange 14 and the non-output rotor flange 31 are respectively connected to the support body 11 by a ring of first bolts, making it easier to assemble and maintain. A cavity is formed inside the rotor assembly to house the emergency steering pump. The non-output bearing 26 is slightly larger than the output bearing 22 to accommodate the installation of the emergency steering pump. When the rotor support rotates, the resolver rotor, fixed to the second annular flange 29 integrally formed with the non-output rotor flange 31, rotates along with the rotor support. The resolver stator, fixed to the non-output end cover 07 of the motor housing, does not rotate. Thus, the resolver assembly 27 can provide a position signal to the motor controller. The resolver assembly 27 is existing technology; its specific structure and working principle will not be described in detail.

[0052] The non-input end cover 34 of the radial piston pump 25 extends from the second annular flange 29 on the non-output rotor flange 31, that is, it extends from the center hole of the non-output rotor flange 31, without affecting the rotation of the rotor assembly. After extending from the second annular flange 29, the non-input end cover 34 of the radial piston pump 25 is fixed to the adapter plate 28 by a ring of second bolts 38. The adapter plate 28 is fixed to the non-output end cover 07 by a ring of third bolts 06. Both sets of fixing structures are designed with a stop structure to ensure the coaxiality of the radial piston pump 25 and the rotor support. The inlet / outlet oil passages of the radial piston pump 25 are provided with corresponding hydraulic interfaces on the adapter plate 28, namely the oil inlet 04 and the oil outlet 05. When the radial piston pump 25 draws in oil, the oil flows into the radial piston pump 25 through the oil inlet 04 and the oil inlet passage; when the radial piston pump 25 pumps oil, the oil in the radial piston pump 25 flows out of the radial piston pump 25 through the oil outlet passage and the oil outlet 05.

[0053] This configuration of the drive motor 01 offers good maintainability. If a malfunction requires removal of the emergency steering pump, simply open the non-output end cover 07 of the drive motor 01 and remove the non-output rotor flange 31 to disassemble the emergency steering pump. With future design optimizations, if the outer diameter of the emergency steering pump housing is smaller than the center hole of the non-output rotor flange 31 of the drive motor 01, the emergency steering pump can be removed simply by removing the non-output end cover 07 of the drive motor 01.

[0054] The beneficial effects of this invention are as follows: (1) To solve the problem of no emergency steering function in the wheel-side electric drive system, a split hollow rotor drive motor 01 is designed, and the emergency steering pump is built into the drive motor 01 without occupying external space. The total volume of drive motor 01 remains unchanged, and the layout is more flexible, which can realize the emergency steering function of electric multi-axle heavy-duty off-road vehicles.

[0055] (2) For multi-axle drive vehicles, the number of emergency steering pumps can be configured as needed. The drive motor 01 is decoupled from the structure and function of the emergency steering pump. The drive motor 01 part can be universal without change, with a high degree of modularity and more flexible configuration.

[0056] (3) The emergency steering pump takes power from the rotor flange 14 at the output end of the drive motor 01, and can achieve synchronous rotation with the wheel. That is, as long as the wheel is rotating, the emergency steering pump can work, shielding the influence of other factors.

[0057] (4) The drive motor 01 of this configuration has good maintainability. If the emergency steering pump needs to be removed due to a malfunction, simply open the non-output end cover 07 of the drive motor 01 and remove the non-output rotor flange 31 of the drive motor 01 to remove the emergency steering pump. In the future, through optimized design, if the outer diameter of the emergency steering pump housing is smaller than the center hole of the non-output rotor flange 31 of the drive motor 01, the emergency steering pump can be removed simply by removing the non-output end cover 07 of the drive motor 01.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drive motor, characterized in that: The device includes a motor housing, within which a stator assembly is fixedly mounted. A rotor assembly is rotatably mounted within the stator assembly. The rotor assembly includes a rotor support and a rotor core assembly located outside the rotor support. The rotor support is rotatably mounted on the motor housing. A radial piston pump is coaxially mounted within the rotor support. The camshaft of the radial piston pump is drively connected to the rotor support. The end of the radial piston pump furthest from the camshaft extends out of the rotor support and is fixedly connected to the motor housing. The end of the radial piston pump furthest from the camshaft has an oil inlet and an oil outlet. The motor housing has an oil inlet and an oil outlet, with the oil inlet communicating with the oil inlet channel and the oil outlet communicating with the oil outlet channel.

2. The drive motor according to claim 1, characterized in that: The motor housing includes a housing body, an output end cover, and a non-output end cover. The housing body is cylindrical and has a water jacket assembly. The output end cover and the non-output end cover are fixedly installed at both ends of the housing body, respectively. A stator assembly is fixedly installed inside the housing body. The two ends of the rotor support are the rotor output end and the rotor non-output end, respectively. The rotor output end and the rotor non-output end of the rotor support are rotatably mounted on the output end cover and the non-output end cover, respectively. The camshaft of the radial piston pump is drivenly connected to the rotor output end of the rotor support. The end of the radial piston pump away from the camshaft passes through the rotor non-output end of the rotor support and is fixedly connected to the non-output end cover. The non-output end cover has an oil inlet and an oil outlet.

3. The drive motor according to claim 2, characterized in that: The stator assembly is cylindrical, and the outer cylindrical wall of the stator assembly is fixedly connected to the inner cylindrical wall of the housing body. The stator assembly and the housing body are arranged coaxially.

4. The drive motor according to claim 3, characterized in that: The rotor support includes a support body, an output rotor flange, and a non-output rotor flange. The support body is cylindrical, and a rotor core assembly is provided on the outer wall of the support body. The support body and the stator assembly are arranged coaxially. The output rotor flange and the non-output rotor flange are coaxially fixedly installed at both ends of the support body, respectively. The output rotor flange and the non-output rotor flange are the rotor output end and rotor non-output end of the rotor support, respectively. The radial piston pump is located in the cavity formed by the support body, the output rotor flange, and the non-output rotor flange. The radial piston pump is coaxially arranged with the support body, the output rotor flange, and the non-output rotor flange.

5. The drive motor according to claim 4, characterized in that: An output shaft is coaxially fixed on the outside of the output rotor flange. The output shaft is rotatably mounted on the output end cover via an output end bearing. The end of the output shaft away from the output rotor flange extends through the output end cover to the outside of the output end cover. A first annular flange is coaxially fixed on the inside of the output rotor flange. The camshaft of the radial piston pump is inserted into the first annular flange and is drivenly connected to the first annular flange.

6. The drive motor according to claim 5, characterized in that: The camshaft of the radial piston pump is connected to the first annular flange by a spline, and a first oil seal is provided between the end of the radial piston pump near the camshaft and the outer peripheral wall of the first annular flange.

7. The drive motor according to claim 6, characterized in that: The outer side of the non-output end rotor flange is coaxially fixed with a second annular flange. The second annular flange is rotatably mounted on the non-output end cover through a non-output end bearing. The end of the radial piston pump away from the camshaft passes through the second annular flange and is fixedly connected to the non-output end cover.

8. The drive motor according to claim 7, characterized in that: The non-output end cap is provided with a non-output end mounting hole. The second annular flange is inserted into the non-output end mounting hole. The second annular flange is rotatably mounted on the hole wall of the non-output end mounting hole through a non-output end bearing. An adapter plate is fixedly provided at the non-output end mounting hole on the outside of the non-output end cap. The adapter plate is provided with an oil inlet and an oil outlet. The end of the radial piston pump away from the camshaft passes through the second annular flange and is fixedly connected to the adapter plate.

9. The drive motor according to claim 8, characterized in that: A resolver assembly is provided between the motor housing and the rotor assembly. The resolver assembly includes a resolver stator and a resolver rotor. The resolver stator is fixed on the wall of the non-output end mounting hole of the non-output end cover, and the resolver rotor is fixed on the second annular flange.

10. A wheel-side electric drive system integrating emergency steering function, characterized in that: The device includes the drive motor, wheel-side drive shaft, and wheel-side reducer as described in any one of claims 1-9, wherein a flange fork is fixedly mounted on the output shaft, a second oil seal is provided between the flange fork and the output end cover, the flange fork is fixedly connected to one end of the wheel-side drive shaft, and the other end of the wheel-side drive shaft is fixedly connected to the wheel-side reducer.

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