Cooling structure of hybrid drive motor

Abstract

The utility model discloses a cooling structure of a hybrid drive motor, which comprises a casing, a stator core and a rotor, the stator core and the rotor are arranged in the casing, the casing is connected with a front casing and a rear casing, and the cooling structure is characterized in that the front casing is provided with an oil inlet IX, the casing is provided with an oil inlet communicated with the oil inlet IX, and the oil inlet IX is provided with an oil outlet communicated with the oil inlet IX. The oil inlet hole is communicated with an oil spraying hole formed in the inner wall of the machine shell. A cooling oil storage cavity is arranged between the casing and the stator core, and an oil return groove is arranged below the casing; the rotor comprises a rotor iron core, the rotor iron core is installed on a rotating shaft, an oil through hole V communicated with the oil inlet hole IX is formed in the center of the rotating shaft, and an oil through hole VI communicated with the oil through hole V is formed in the outer wall of the rotating shaft. The cooling structure of the hybrid drive motor is high in cooling efficiency and compact in size, improves the heat dissipation performance of the motor, and has high practicability and good application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of drive motors, and more specifically relates to a cooling structure of a hybrid drive motor. Background Art

[0002] As the core component of the hybrid vehicle power system, the drive motor is subjected to high temperature, high humidity and other operating environments in different operating conditions of the vehicle. These harsh conditions and operating environments place high demands on the heat dissipation performance of the drive motor.

[0003] At present, most of the drive motors of hybrid vehicles are cooled by water, which adopts an indirect cooling circulating water channel structure. In this cooling structure, the main heat-generating components such as the motor stator core and winding are in indirect contact with the cooling water channel through the shell wall and conduct and radiate heat. The cooling thermal resistance is large and the cooling efficiency is low. It cannot meet the heat dissipation requirements of the drive motor under short-term high power and harsh working conditions, and it is very easy to cause local heat concentration and burning of the drive motor, which poses a great hidden danger to the safety of vehicle operation.

[0004] At the same time, the water channel structure of the hybrid vehicle drive motor using water cooling technology makes the motor structure complex and the volume larger, which is contrary to the use requirements of hybrid vehicle drive motors for lightweight, high power density, and high torque density. In order to solve the above problems, a cooling structure for the oil-cooled drive motor of the hybrid system is designed to improve the cooling efficiency of the drive motor, tap the potential efficiency of the motor, increase the power density and torque density of the motor, and enhance the operating reliability and safety of the vehicle.

[0005] Announcement No. CN 101252297 A, Publication Date 2008.08.27, Patent Name The present invention discloses a water-cooled driving motor for electric vehicles, which includes a stator assembly, a rotor assembly, a housing, an end cover, a water inlet pipe joint and a water outlet pipe joint. The housing is formed by an inner tube and an outer tube sealing sleeve, the left end of the outer wall of the outer tube is radially installed with a water inlet pipe joint, and the right end is installed with a water outlet pipe joint, and an annular groove is provided at both ends of the outer wall of the inner tube corresponding to the positions of the water inlet pipe joint and the water outlet pipe joint arranged on the outer wall of the outer tube, and the outer wall of the inner tube is connected to the two annular grooves by axial concave straight grooves evenly spaced apart. Utility Model Content

[0006] The utility model aims to solve the problems existing in the prior art and provide a cooling structure of a hybrid drive motor with high cooling efficiency, compact size and improved heat dissipation performance of the motor.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the cooling structure of the hybrid drive motor provided includes a casing and a stator core and a rotor arranged in the casing, the casing is connected to a front casing and a rear casing, and is characterized in that: an oil inlet hole IX is provided on the front casing, an oil inlet hole relatively connected to the oil inlet hole IX is provided on the casing, and the oil inlet hole is connected to an oil injection hole arranged on the inner wall of the casing; a cooling oil storage chamber is provided between the casing and the stator core, and an oil return groove is provided under the casing; the rotor includes a rotor core, the rotor core is installed on a rotating shaft, an oil through hole V connected to the oil inlet hole IX is provided at the center of the rotating shaft, and an oil through hole VI connected to the oil through hole V is provided on the outer wall of the rotating shaft.

[0008] In order to make the above technical solution more detailed and specific, the utility model also provides the following further preferred technical solutions to obtain satisfactory practical effects:

[0009] The rotor core is provided with a plurality of oil holes VI arranged obliquely toward both ends.

[0010] The first rotor end plate and the second rotor end plate are installed at both ends of the rotor core. The first rotor end plate is provided with an oil hole VII connected to the oil hole VI at the corresponding position, and the second rotor end plate is provided with an oil hole VIII connected to the oil hole VI at the corresponding position.

[0011] The outlet of the oil hole VI at the outermost end of the rotor core is disposed on the outer sides of the first rotor end plate and the second rotor end plate.

[0012] The first rotor end plate is provided with four oil holes VII which are evenly spaced along the circumferential direction; the second rotor end plate is provided with four oil holes VIII which are evenly spaced along the circumferential direction.

[0013] The first bearing and the second bearing are respectively provided at two ends of the rotor core, and the rotor is connected to the front housing and the rear housing respectively through the first bearing and the second bearing at two ends.

[0014] The casing is provided with a plurality of oil injection holes arranged at intervals in the axial direction, and the oil injection holes are arranged at intervals of 30 degrees in the circumferential direction.

[0015] The inner wall of the housing is provided with an interference fit surface F which matches with the stator core.

[0016] The interference fit surface F and the cooling oil storage cavity are arranged adjacent to each other in a staggered manner.

[0017] Compared with the prior art, the utility model has the following advantages: the cooling structure of the hybrid drive motor of the utility model has high cooling efficiency and compact size, improves the heat dissipation performance of the motor, has strong practicality and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 This is a schematic diagram of the cooling structure of the drive motor of the utility model;

[0020] Figure 2 This is a schematic diagram of the front housing structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the casing structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the casing structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the rotor structure of the utility model;

[0024] Figure 6 This is a schematic diagram of the rotating shaft structure of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the first rotor end plate of the utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the second rotor end plate of the utility model.

[0027] The markings in the figure are:

[0028] 1. Front housing, 1-1, oil inlet hole IX, 2. Casing, 2-1 / 2, oil injection holes III / IV, 2-3, oil inlet hole I, 2-4, oil inlet hole II, 2-5, cooling oil storage chamber, 2-6, matching surface F, 2-7, oil return groove, 3. stator core, 4. rear housing; 5. rotor, 5-1, first bearing, 5-2, rotor core, 5-3, first rotor end plate, 5-3-1, oil hole VII, 5-4, rotating shaft, 5-4-1, oil hole VI, 5-4-2, oil hole V, 5-5, second rotor end plate, 5-5-1, oil hole VIII, 5-6, second bearing. DETAILED DESCRIPTION

[0029] The specific implementation of the utility model will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the utility model, the oil-cooled motor cooling structure is used for the drive motor of a hybrid vehicle. During the operation of the vehicle, the drive motor can be used as the sole or auxiliary power unit to provide driving force for the vehicle. The cooling structure of the drive motor includes a housing 2, a stator core 3, a rotor 5, a front housing 1, and a rear housing 4. The rotor 5 includes a rotor core 5-2, a first rotor end plate 5-3 and a second rotor end plate are provided on the rotor core 5-2, a rotating shaft 5-4 is provided at the center of the rotor core 5-2, and a first bearing 5-1 and a second bearing 5-6 are provided at both ends of the rotating shaft 5-4. The stator core 3 is connected to the housing 2 by an interference fit; the stator core 3 is fitted with the matching surface F2-6 of the inner wall of the housing. The front housing 1 is fixedly connected to the housing 2 by flange bolts; the rear housing 4 is fixedly connected to the housing 2 by flange bolts; the rotor 5 is connected to the front housing 1 and the rear housing 4 by the first bearing 5-1 and the second bearing 5-6 at both ends.

[0032] In the utility model, the outer wall of the casing 2 is provided with an oil inlet hole Ⅰ2-3 and an oil inlet hole Ⅱ2-4; the inner wall of the casing 2 is provided with an oil injection hole Ⅲ2-1 and an oil injection hole Ⅳ2-2, and a number of oil injection holes are evenly distributed along the axial direction of the inner wall of the casing, and the inner wall of the casing is provided with an interference fit surface F2-6 that cooperates with the stator core, and the interference fit surface F2-6 is adjacent to the cooling oil storage cavity 2-5 and arranged in staggered intervals; the center of the rotating shaft 5-4 is provided with an oil through hole Ⅴ5-4-2, and the outer wall of the rotating shaft 5-4 is provided with an oil through hole Ⅵ5-4-1 connected to the outer wall by the oil through hole Ⅴ5-4-2; the first rotor end plate 5-3 is provided with an oil through hole Ⅶ5-3-1; the second rotor end plate 5-5 is provided with an oil through hole Ⅷ5-5-1, and the outer wall of the front housing 1 is provided with an oil inlet hole Ⅸ1-1.

[0033] In the utility model, the inner wall of the casing 2 has oil spray holes III / IV2-1 / 2, and three oil spray holes are arranged at each location in the radial direction, and the angles thereof are arranged at -30°, 0°, and +30°.

[0034] In the utility model, the oil inlet hole Ⅰ2-3 and the oil inlet hole Ⅱ2-4 of the casing are connected with the oil injection hole Ⅲ and the oil injection hole Ⅳ on the inner wall of the casing 2; a cooling oil storage chamber G is formed between the inner wall of the casing, the side of the interference fit surface F2-6C and the stator core 3; the central oil through hole Ⅴ5-4-2 of the rotating shaft 5-4 is connected with the oil through hole Ⅵ5-4-1, and the oil through hole Ⅵ5-4-1 is aligned with the orifices of the oil through hole Ⅶ5-3-1 and the oil through hole Ⅷ5-5-1 of the first rotor end plate 5-3 and the second rotor end plate 5-5 and is connected; the oil inlet hole Ⅸ1-1 of the front casing is opposite to the central oil through hole Ⅴ5-4-2 of the rotating shaft, the oil inlet hole Ⅰ2-3 and the oil inlet hole Ⅱ2-4 of the casing and is connected.

[0035] In the utility model, Figure 6As shown in , the rotor core 5-2 is provided with a plurality of oil holes VI5-4-1 arranged obliquely toward both ends. The first rotor end plate 5-3 and the second rotor end plate 5-4 are installed at both ends of the rotor core 5-2. The first rotor end plate 5-3 is provided with an oil hole VII5-3-1 connected to the oil hole VI5-4-1 at the corresponding position, and the second rotor end plate 5-5 is provided with an oil hole VIII connected to the oil hole VI5-4-1 at the corresponding position. The outlet of the oil hole VI5-4-1 at the outermost end of the rotor core 5-2 is placed on the outer side of the first rotor end plate 5-3 and the second rotor end plate 5-5, so as to facilitate the smooth discharge and return of oil and improve the cooling efficiency. As shown in Figure 7 , 8 As shown in the figure, the first rotor end plate 5-3 is provided with four oil holes VII5-3-1 evenly spaced along the circumferential direction; the second rotor end plate 5-5 is provided with four oil holes VIII5-5-1 evenly spaced along the circumferential direction. Four oil holes corresponding to the four oil holes on the end plate are provided in the radial direction of the rotating shaft 5-4.

[0036] like Figures 1 to 8 As shown, the stator core 3 is connected with the casing inner wall mating surface F2-6 of the casing 2 by interference fit, and a cooling oil storage chamber 2-5 is formed; the cooling oil passes through the oil inlet hole IX1-1, the oil inlet hole I2-3, the oil inlet hole II2-4, the oil injection holes III / IV2-1 / 2, the cooling oil storage chamber 2-5, and the oil return groove 2-7 to form a channel for cooling the motor stator; the cooling oil passes through the oil inlet hole IX1-1, the oil hole V5-4-2 in the center of the shaft, the oil hole VI5-4-1 on the side wall of the shaft, the oil hole VII5-3-1 on the first rotor end plate, the oil hole VIII5-5-1 on the second rotor end plate, and the oil return groove 2-7 to form a channel for cooling the motor rotor.

[0037] When the drive motor is running, the cooling oil cools the motor stator through the above-mentioned motor stator cooling channel, and at the same time, the non-outgoing winding end (front section), core punching sheet (middle section), and emerging winding end (rear section) of the motor stator core are cooled by spraying oil through the oil spray holes III / IV2-1 / 2 arranged on the casing; the 2-1 / 2 oil spray holes III / IV on the casing are arranged at angles of -30°, 0°, and +30° in the radial direction, and are evenly arranged at multiple positions on the inner wall of the casing in the axial direction, so as to improve the uniformity of cooling the motor stator and improve the heat dissipation performance.

[0038] During the operation of the drive motor, the cooling oil cools the motor rotor through the rotor cooling channel. The cooling oil enters the oil hole V5-4-2 from the oil inlet hole IX1-1 and flows along the axis of rotation in the rotor cooling channel. Under the centrifugal force of the rotor, the cooling oil enters the oil hole VI5-4-1 and the oil hole VII5-3-1 and the oil hole VIII5-5-1 aligned therewith. Under the centrifugal force, the cooling oil is thrown out of the first rotor end plate 5-3 and the second rotor end plate 5-5, and enters the oil return groove 2-7 under the action of gravity. This structural setting can cool the motor from the inside to the outside, and the cooling efficiency is high.

[0039] The cooling structure of the hybrid oil-cooled drive motor is reasonably designed. The cooling oil can directly cool the heat source and eliminate hot spots. The cooling method is direct and the cooling and heat dissipation efficiency is high. Compared with the cooling structure of the traditional water-cooled motor, the shell does not need to be designed with water channels, fans and air ducts, which can effectively reduce the size of the motor and reduce the trial of effective materials in the motor, thereby reducing the cost of the motor, and has good technical effects and economic benefits.

[0040] The present invention provides a cooling structure for a hybrid oil-cooled drive motor, which includes a motor stator cooling channel and a motor rotor cooling channel, and can perform oil cooling on the motor stator and the motor rotor simultaneously during the operation of the motor. The cooling structure is compact in size, and effectively simplifies the cooling channel of a traditional water-cooled motor; the cooling structure has high cooling efficiency, and can quickly conduct heat from the main heat-generating parts such as the stator core and the rotor during the operation of the motor to the outside of the motor and dissipate the heat through direct contact cooling of the cooling oil, thereby ensuring reliable and safe operation of the motor. Combining the above characteristics, the cooling structure of a hybrid oil-cooled drive motor of the present invention has the characteristics of high cooling efficiency, compact size, and reduction of effective materials of the motor, thereby improving the heat dissipation performance of the motor, increasing the power density of the motor, and reducing the cost of the motor.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention is described above by way of example in conjunction with the accompanying drawings, but the present invention is not limited to the above manner. As long as various non-substantial improvements made using the method concept and technical solution of the present invention or direct applications to other occasions are made, they all fall within the protection scope of the present invention.

Claims

1. A cooling structure for a hybrid drive motor, comprising a housing and a stator core and a rotor arranged in the housing, wherein the housing is connected to a front housing and a rear housing, and characterized in that: The front shell body is provided with an oil inlet hole IX, the casing is provided with an oil inlet hole relatively connected with the oil inlet hole IX, and the oil inlet hole is connected to the oil injection hole arranged on the inner wall of the casing; a cooling oil storage chamber is provided between the casing and the stator core, and an oil return groove is provided under the casing; the rotor includes a rotor core, and the rotor core is installed on a rotating shaft, an oil through hole V connected to the oil inlet hole IX is provided at the center of the rotating shaft, and an oil through hole VI connected to the oil through hole V is provided on the outer wall of the rotating shaft.

2. The cooling structure of the hybrid drive motor according to claim 1, characterized in that: The rotor core is provided with a plurality of oil holes V which are arranged obliquely toward both ends.

3. The cooling structure of the hybrid drive motor according to claim 2, characterized in that: The first rotor end plate and the second rotor end plate are installed at both ends of the rotor core. The first rotor end plate is provided with an oil hole VII connected to the oil hole VI at the corresponding position, and the second rotor end plate is provided with an oil hole VIII connected to the oil hole VI at the corresponding position.

4. The cooling structure of the hybrid drive motor according to claim 3, characterized in that: The outlet of the oil hole V at the outermost end of the rotor core is disposed on the outer sides of the first rotor end plate and the second rotor end plate.

5. The cooling structure of the hybrid drive motor according to claim 4, characterized in that: The first rotor end plate is provided with four oil holes VII which are evenly spaced along the circumferential direction; the second rotor end plate is provided with four oil holes VIII which are evenly spaced along the circumferential direction.

6. The cooling structure of the hybrid drive motor according to any one of claims 1 to 5, characterized in that: The first bearing and the second bearing are respectively provided at two ends of the rotor core, and the rotor is connected to the front housing and the rear housing respectively through the first bearing and the second bearing at two ends.

7. The cooling structure of the hybrid drive motor according to claim 1, characterized in that: The casing is provided with a plurality of oil injection holes arranged at intervals in the axial direction, and the oil injection holes are arranged at intervals of 30 degrees in the circumferential direction.

8. The cooling structure of the hybrid drive motor according to claim 1, characterized in that: The inner wall of the housing is provided with an interference fit surface F which matches with the stator core.

9. The cooling structure of the hybrid drive motor according to claim 8, characterized in that: The interference fit surface F and the cooling oil storage cavity are arranged adjacent to each other in a staggered manner.

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