一种油冷电驱动机构及高功率密度高集成轮芯电驱动系统
By introducing an oil-cooled electric drive mechanism into the wheel core electric drive system, and using a combination of lubricating oil and air cooling, the problem of uneven heat dissipation under high power density is solved, achieving efficient heat dissipation and lubrication, extending service life, and realizing high integration and lightweighting of the motor, controller, reduction transmission mechanism, wheel hub and disc brake mechanism.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING ZHIZHU TRANSMISSION IND TECH RES INST CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-17
AI Technical Summary
Existing wheel-core electric drive systems suffer from uneven heat dissipation, high heat generation, oil mist spraying, and insufficient lubrication of bearings and gears under high power density and ultra-high torque, leading to problems such as motor overheating, shutdown, and magnet demagnetization. Furthermore, there is a lack of highly integrated solutions that combine motors, controllers, reduction transmission mechanisms, wheel hubs, disc brake mechanisms, and oil cooling methods.
It adopts an oil-cooled electric drive mechanism. By setting a partition plate for lubricating and cooling oil in the housing and setting an oil passage on the partition plate, the motor assembly chamber and the reduction assembly chamber are connected and lubricating and cooling oil is injected into both. Combined with air cooling, a central magnetic ring and a bottom magnetic ring are added to adsorb impurities, achieving efficient heat dissipation and lubrication. At the same time, the motor, controller, reduction transmission mechanism, wheel hub and disc brake mechanism are integrated.
It achieves efficient heat dissipation, avoids motor overheating, improves operational stability and service life, extends the service life of lubricating and cooling oil, ensures that the motor output power and torque are not affected, and realizes a high power density, high integration and lightweight electric drive system.
Smart Images
Figure CN224520866U_ABST
Abstract
Claims
1. An oil-cooled electric drive mechanism, comprising a housing, a motor assembly, and a reduction gear transmission mechanism, wherein the interior of the housing is divided into a motor assembly chamber and a reduction gear assembly chamber by a partition plate, the motor assembly comprising a motor shaft rotatably mounted in the motor assembly chamber, a rotor synchronously mounted on the motor shaft, and a stator fixedly mounted in the housing, the stator being coaxially surrounding the outside of the rotor, the partition plate having a motor shaft through-hole adapted to the motor shaft, the motor shaft passing through the motor shaft through-hole and connecting to the reduction gear transmission mechanism located in the reduction gear assembly chamber, characterized in that: A central magnetic ring is installed in the motor shaft through hole, surrounding the motor shaft. The outer or inner side of the central magnetic ring has an annular oil filter slit. At least one oil through hole is provided at the bottom of the partition plate. An annular bottom magnetic ring is installed on the wall of each oil through hole. The motor assembly chamber and the reduction assembly chamber are filled with lubricating and cooling oil of equal height. The level of the lubricating and cooling oil is higher than all the oil through holes and lower than the lowest point of the rotor.
2. An oil-cooled electric drive mechanism according to claim 1, characterized in that: The enclosure also includes a motor housing and a reducer housing, which are respectively installed on both sides of the partition plate by threaded fasteners. The motor housing and the partition plate together form the motor assembly chamber, and the reducer housing and the partition plate together form the reducer assembly chamber. The motor housing includes a motor housing body installed on the side of the partition plate away from the reducer housing by threaded fasteners, and a motor housing end cover installed on the end of the motor housing body away from the partition plate by threaded fasteners. A transparent observation window is provided at the lower part of the motor housing end cover.
3. An oil-cooled electric drive mechanism according to claim 1, wherein: The speed reduction transmission mechanism includes a primary drive gear sleeve synchronously mounted on the motor shaft. The bushing portion of the primary drive gear sleeve is coaxially inserted into the through hole of the motor shaft. The central magnetic ring is synchronously mounted on the bushing portion, and the oil filter gap is formed between the circumferential outer wall of the central magnetic ring and the hole wall of the through hole of the motor shaft.
4. An oil-cooled electric drive mechanism according to any one of claims 1-3, characterized in that: The motor shaft has an integrally formed annular mounting boss protruding radially. The rotor includes two iron core retainers fixedly mounted at both ends of the annular mounting boss and at least one iron core arranged side by side between the two iron core retainers. Each iron core is composed of multiple magnetic steel sheets arranged side by side along the axial direction of the motor shaft. The same number of permanent magnets are evenly distributed around each iron core. Each iron core retainer includes a bracket mounting plate that matches the corresponding end face of the annular mounting boss and an L-shaped mounting groove that extends axially towards the annular mounting boss from the outer edge of the bracket mounting plate and then radially away from the motor shaft. The bottom of the two L-shaped mounting grooves is flush with the circumferential outer wall of the annular mounting boss, thus forming a mounting ring surface. All the magnetic steel sheets are synchronously rotated and fitted onto the mounting ring surface. At least two axially penetrating riveting holes are provided on the annular mounting boss along the circumference of the motor shaft. Each of the bracket mounting plates is provided with a riveting hole corresponding to each riveting hole. The two bracket mounting plates are coaxially arranged at both ends of the annular mounting boss, and the two ends of each riveting hole are respectively connected to the corresponding riveting hole and locked by rivets, so that the groove walls of the two L-shaped mounting grooves clamp all the magnets between them.
5. An oil-cooled electric drive mechanism according to claim 4, wherein: At least one axially penetrating positioning groove is recessed on the circumferential outer wall of the annular mounting boss. The bottom of the L-shaped mounting groove is provided with positioning notches corresponding to each positioning groove. Each positioning groove is connected to the corresponding positioning notches at both ends, and the width of each positioning notch is equal to the width of the adjacent positioning groove. Thus, each positioning groove and its corresponding positioning notches at both ends together form a magnetic steel sheet positioning groove. The inner edge of the magnetic steel sheet protrudes to form positioning protrusions corresponding to each magnetic steel sheet positioning groove. Each positioning protrusion of the magnetic steel sheet is embedded in the corresponding magnetic steel sheet positioning groove.
6. An oil-cooled electric drive mechanism according to claim 4, wherein: The iron core is provided with at least two, and the permanent magnets of the iron core are arranged sequentially in the axial direction and staggered at equal intervals in the circumferential direction.
7. A high power density high integration wheel core electric drive system, characterized in that: The invention includes a swingarm, a wheel hub, a disc brake mechanism, and an oil-cooled electric drive mechanism as described in any one of claims 1-6. A first support shaft and a second support shaft are fixedly mounted on the housing. The outer ends of the two swingarm arms of the swingarm are fixedly connected to the first support shaft and the second support shaft, respectively. The wheel hub, driven by a reduction transmission mechanism, is rotatably mounted on the second support shaft. The disc brake mechanism includes a disc brake disc that is synchronously mounted on the side of the wheel hub away from the housing and a brake caliper that is adapted to the disc brake disc. The brake caliper is mounted on a swingarm arm adjacent to the disc brake disc via a brake caliper bracket.
8. The high power density high integration wheel core electric drive system according to claim 7, characterized in that: The housing is integrally formed with a controller housing extending along the length of adjacent flat fork arms. Inside the controller housing is a controller electrically connected to the stator windings. The outer wall of the controller housing is formed with flat fork positioning grooves adapted to the corresponding flat fork arms and at least one set of bolt connecting seats corresponding to each flat fork positioning groove. One of the flat fork arms is embedded in the flat fork positioning groove and at least one reinforcing connecting plate is fixedly installed along its length. Each reinforcing connecting plate has two bolt mounting holes located on both sides of the flat fork positioning groove. The housing is integrally formed with bolt connecting seats corresponding to each bolt mounting hole. Each reinforcing connecting plate is locked to the corresponding bolt connecting seat by threaded fasteners passing through each bolt mounting hole.
9. The high power density high integration wheel core electric drive system according to claim 8, characterized in that: Two sets of controller housing heat dissipation ribs extending along the length of the flat fork arm are integrally formed on the outer wall of the controller housing, and the gap between the two sets of controller housing heat dissipation ribs forms the flat fork positioning groove.
10. The high power density, highly integrated wheel core electric drive system according to claim 8, characterized in that: The side of the controller housing away from the horizontal fork positioning groove is fixedly connected to a horizontal fork arm away from the controller housing via a reinforcing bracket. The reinforcing bracket includes a connecting pipe mounting plate fixedly installed on a horizontal fork arm away from the controller housing and two connecting pipes fixedly installed on the connecting pipe mounting plate. The ends of the two connecting pipes away from the connecting pipe mounting plate are respectively fixedly connected to corresponding connecting pipe mounting seats integrally formed on the controller housing. Both connecting pipes are parallel to the horizontal fork tube of the horizontal fork and form an isosceles triangle arrangement with the horizontal fork tube.