Multi-motor wheel drive axle
By designing a multi-motor wheel-side drive axle, combined with a circulating system of cooling oil tank and semiconductor refrigeration chip, the problem of insufficient heat dissipation under high load in traditional single-motor drive axles is solved, achieving effective heat dissipation and stable equipment operation.
Patent Information
- Application Number
- CN202423311451.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Traditional single-motor wheel-side drive axles have insufficient heat dissipation efficiency under high loads or long-term operation, leading to heat accumulation inside the axle housing, which affects equipment stability and failure rate.
It adopts a multi-motor structure and uses a circulating system of cooling oil tank and semiconductor refrigeration chip to conduct heat through the circulation of cooling oil and heat transfer oil. Combined with heat spreader and mechanical seal, it achieves effective heat dissipation.
It improves the stability of power output and transmission efficiency, reduces equipment failure rate, and solves the problem of heat accumulation in multi-motor structures.
Smart Images
Figure CN223508079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drive axle technology, and more specifically, to a multi-motor wheel-side drive axle. Background Technology
[0002] With the continuous development of the automotive industry, especially the advancements in electric vehicles and heavy-duty vehicles, wheel-side drive axles, as an advanced drive system, have gained increasingly widespread application due to their advantages such as high efficiency, independent control, and flexible layout. Traditional wheel-side drive axles typically employ a single-motor drive structure. While this can meet basic power transmission requirements, its limitations are becoming increasingly apparent when facing complex operating conditions and applications with higher power demands. Furthermore, when using multi-motor assisted drive, the motors generate significant heat during operation, especially under high loads or prolonged periods, making heat dissipation a critical issue. Traditional air cooling or natural cooling methods are insufficient in heat dissipation efficiency under high loads, easily leading to severe heat buildup inside the axle housing. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model provides a multi-motor wheel-side drive axle, including an axle housing and outer covers located at both ends of the axle housing. A wheel hub is connected to the other end of the outer cover. A first motor and a second motor are symmetrically arranged inside the axle housing. Half shafts are installed inside the outer covers on both sides, and the two half shafts are respectively connected to the output shafts of the first motor and the second motor. A multi-motor auxiliary component is installed on the outer wall of the outer cover, and the output end of the multi-motor auxiliary component extends into the interior of the outer cover. A heat-spreading component is sleeved on the outside of the half shafts near the axle housing. The heat-spreading component is located inside the outer cover. A cooling oil tank connected to the heat-spreading component is installed on the outer wall of the outer cover outside the heat-spreading component.
[0004] In a preferred embodiment, the multi-motor auxiliary component includes a protective cover fixed to the outer wall of the outer casing and an auxiliary motor installed inside the protective cover. A bearing is embedded in the outer wall of the outer casing located inside the protective cover, and the output shaft of the auxiliary motor extends into the interior of the outer casing through the bearing.
[0005] In a preferred embodiment, a first helical gear is installed at the end of the output shaft of the auxiliary motor located inside the outer casing, and a second helical gear that meshes with the first helical gear is sleeved outside the half shaft.
[0006] In a preferred embodiment, the heat dissipation component includes a cooling bushing fitted outside the half-shaft. The cooling bushing is cylindrical and hollow inside. A mechanical seal is fitted at the connection between the half-shaft and the cooling bushing. The cooling bushing is filled with heat-conducting oil.
[0007] In a preferred embodiment, the cooling bushing is fitted with a plurality of equidistant heat spreaders, the outer edges of which are fixed to the inner wall of the outer cover, and one end of the heat spreader is fixed to the end of the first motor and the second motor along the axial direction.
[0008] In a preferred embodiment, an oil inlet pipe and an oil outlet pipe are installed on the outer wall of the cooling bushing. The oil inlet pipe and the oil outlet pipe extend through the outer cover to the interior of the cooling oil tank. A pressure pump connected to the oil inlet pipe and the oil outlet pipe is installed inside the cooling oil tank.
[0009] In a preferred embodiment, a semiconductor cooling chip is attached to the outer wall of the cooling oil tank.
[0010] The technical effects and advantages of this utility model are as follows:
[0011] This utility model adopts a multi-motor assisted structure, which makes the power output smoother and more stable, improves the transmission efficiency, and adopts a circulating flow method to circulate the heat generated by the multi-motor structure during operation to the outside of the axle housing, avoiding the accumulation of heat inside the axle housing, reducing the heat accumulation problem caused by the multi-motor structure, and reducing the equipment failure rate. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0013] Figure 2 This is a schematic diagram of the internal structure of the present invention;
[0014] Figure 3 For the present utility model Figure 2 Detailed structural diagram at point A in the middle;
[0015] Figure 4 For the present utility model Figure 2 Detailed structural diagram at point B
[0016] Explanation of reference numerals in the attached drawings: 1. Bridge housing; 2. Outer cover; 3. Hub; 4. First motor; 5. Second motor; 6. Half shaft; 7. Cooling oil tank; 8. Protective cover; 9. Auxiliary motor; 10. Bearing; 11. First helical gear; 12. Second helical gear; 13. Cooling bushing; 14. Mechanical seal; 15. Heat sink; 16. Oil inlet pipe; 17. Oil outlet pipe; 18. Pressure pump; 19. Semiconductor cooling chip. Detailed Implementation
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.
[0018] like Figure 1-4 The multi-motor wheel-side drive axle shown includes an axle housing 1 and outer covers 2 located at both ends of the axle housing 1. A wheel hub 3 is connected to the other end of the outer cover 2. A first motor 4 and a second motor 5 are symmetrically arranged inside the axle housing 1. Half shafts 6 are installed inside the outer covers 2 on both sides. The two half shafts 6 are respectively connected to the output shafts of the first motor 4 and the second motor 5. A multi-motor auxiliary component is installed on the outer wall of the outer cover 2. The output end of the multi-motor auxiliary component extends into the interior of the outer cover 2. A heat-spreading component is sleeved on the outside of the half shafts 6 near the axle housing 1. The heat-spreading component is located inside the outer cover 2. A cooling oil tank 7 connected to the heat-spreading component is installed on the outer wall of the outer cover 2 outside the heat-spreading component.
[0019] Based on the above, the first motor 4 and the second motor 5 located inside the axle housing 1 drive the half shafts 6 on both sides to rotate. The other end of the half shaft 6 is connected to the wheel hub 3, thereby driving the wheel hub 3 to rotate. During this process, the multi-motor auxiliary component located on the outer cover 2 can work to provide auxiliary power for the drive of the half shaft 6 and improve the stability of the output power of the drive axle.
[0020] The multi-motor auxiliary component includes a protective cover 8 fixed on the outer wall of the outer cover 2 and an auxiliary motor 9 installed inside the protective cover 8. A bearing 10 is embedded in the outer wall of the outer cover 2 located inside the protective cover 8, and the output shaft of the auxiliary motor 9 extends into the interior of the outer cover 2 through the bearing 10.
[0021] A first helical gear 11 is installed at the end of the output shaft of the auxiliary motor 9 located inside the outer casing 2, and a second helical gear 12 that meshes with the first helical gear 11 is sleeved outside the half shaft 6.
[0022] Based on the above, when the multi-motor auxiliary component is working, the auxiliary motor 9 rotates and meshes with the second helical gear 12 outside the half shaft 6 through the first helical gear 11 at the end of its output shaft. When the first motor 4 and the second motor 5 drive the half shaft 6 to rotate, it provides auxiliary power for the rotation of the half shaft 6, making the power output smoother and more stable, and improving the transmission efficiency.
[0023] The heat dissipation component includes a cooling bushing 13 sleeved on the outside of the half shaft 6. The cooling bushing 13 is cylindrical and hollow inside. A mechanical seal 14 is provided at the connection between the half shaft 6 and the cooling bushing 13. The cooling bushing 13 is filled with heat-conducting oil.
[0024] Furthermore, since a multi-motor drive structure is used at the bridge housing 1, heat is prone to accumulate at the bridge housing 1. Therefore, a heat dissipation component is installed inside the outer casing 2 on the side close to the bridge housing 1.
[0025] The cooling bushing 13 is fitted with a plurality of equally spaced heat spreaders 15. The outer edge of the heat spreader 15 is fixed to the inner wall of the outer cover 2. One end of the heat spreader 15 is fixed to the end of the first motor 4 and the second motor 5 in the axial direction.
[0026] Based on the above, the cooling bushing 13 is partially fitted over the outside of the half-shaft 6. The half-shaft 6 located inside the cooling bushing 13 is immersed in the heat-conducting oil of the cooling bushing 13. The half-shaft 6 rotates on the cooling bushing 13 through the mechanical seal 14. The mechanical seal 14 seals the connection between the half-shaft 6 and the cooling bushing 13 to prevent the heat-conducting oil from leaking. The outside of the cooling bushing 13 is connected to the outer cover 2 and the motor inside the bridge housing 1 through several heat-spreading plates 15. The heat is absorbed and conducted to the bridge housing 1, the motor inside the bridge housing 1, and the outer cover 2, and the heat is transferred to the heat-conducting oil inside the cooling bushing 13, which greatly reduces the heat accumulation problem caused by the multi-motor structure.
[0027] An oil inlet pipe 16 and an oil outlet pipe 17 are installed on the outer wall of the cooling bushing 13. The oil inlet pipe 16 and the oil outlet pipe 17 extend through the outer cover 2 to the interior of the cooling oil tank 7. A pressure pump 18 connected to the oil inlet pipe 16 and the oil outlet pipe 17 is installed inside the cooling oil tank 7. A semiconductor refrigeration chip 19 is attached to the outer wall of the cooling oil tank 7.
[0028] Based on the above, the heat generated during operation by the axle housing 1, the motor part inside the axle housing 1, the outer cover 2, the half shaft 6, and the outer cover 2 is absorbed and conducted to the heat transfer oil in the cooling oil tank 7. The heat transfer oil circulates between the cooling oil tank 7 and the cooling bushing 13 through the oil inlet pipe 16, the oil outlet pipe 17, and the pressure pump 18. When the heat-absorbing heat transfer oil circulates back to the cooling oil tank 7, the semiconductor cooling chip 19 located on the outer wall of the cooling oil tank 7 works to cool down the high-temperature heat transfer oil. The cooled heat transfer oil then recirculates back to the cooling bushing 13. This cycle continues, transferring excess heat from inside the axle housing 1 to the outside and accelerating the heat dissipation efficiency.
[0029] Furthermore, this utility model adopts a multi-motor assisted structure, which makes the power output smoother and more stable, improves the transmission efficiency, and adopts a circulating flow method to circulate the heat generated by the multi-motor structure during operation to the outside of the bridge housing 1, avoiding the accumulation of heat inside the bridge housing 1, reducing the heat accumulation problem caused by the multi-motor structure, and reducing the equipment failure rate.
[0030] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.
Claims
1. A multi-motor wheel-side drive axle, comprising an axle housing and outer covers located at both ends of the axle housing, a wheel hub connected to the other end of the outer cover, a first motor and a second motor symmetrically arranged inside the axle housing, and half-shafts installed inside the outer covers on both sides, the two half-shafts being respectively connected to the output shafts of the first motor and the second motor, characterized in that, The outer wall of the outer casing is equipped with a multi-motor auxiliary component, the output end of which extends into the interior of the outer casing. A heat-spreading component is sleeved on the outside of the half-shaft near the bridge housing. The heat-spreading component is located inside the outer casing. A cooling oil tank connected to the heat-spreading component is installed on the outer wall of the outer casing outside the heat-spreading component.
2. The multi-motor wheel-side drive axle according to claim 1, characterized in that: The multi-motor auxiliary component includes a protective cover fixed to the outer wall of the outer cover and an auxiliary motor installed inside the protective cover. A bearing is embedded in the outer wall of the outer cover located inside the protective cover, and the output shaft of the auxiliary motor extends into the interior of the outer cover through the bearing.
3. A multi-motor wheel-side drive axle according to claim 2, characterized in that: A first helical gear is installed at the end of the output shaft of the auxiliary motor located inside the outer casing, and a second helical gear that meshes with the first helical gear is sleeved outside the half shaft.
4. The multi-motor wheel-side drive axle according to claim 1, characterized in that: The heat dissipation component includes a cooling bushing fitted outside the half shaft. The cooling bushing is cylindrical and hollow inside. A mechanical seal is fitted at the connection between the half shaft and the cooling bushing. The cooling bushing is filled with heat-conducting oil.
5. A multi-motor wheel-side drive axle according to claim 4, characterized in that: The cooling bushing is fitted with several equidistant heat spreaders. The outer edges of the heat spreaders are fixed to the inner wall of the outer cover, and one end of the heat spreader in the axial direction is fixed to the end of the first motor and the second motor.
6. A multi-motor wheel-side drive axle according to claim 4, characterized in that: An oil inlet pipe and an oil outlet pipe are installed on the outer wall of the cooling bushing. The oil inlet pipe and the oil outlet pipe extend through the outer cover to the inside of the cooling oil tank. A pressure pump connected to the oil inlet pipe and the oil outlet pipe is installed inside the cooling oil tank.
7. A multi-motor wheel-side drive axle according to claim 4, characterized in that: A semiconductor cooling chip is attached to the outer wall of the cooling oil tank.