CN220172991U - Oil cooling motor structure - Google Patents

Abstract

The utility model discloses an oil-cooled motor structure which comprises a casing, a stator iron core, a rotor iron core, windings, an end cover, a motor shaft and a bearing, wherein an oil inlet is formed in one side of the casing, oil path branches are arranged in the wall thickness of the casing in an extending mode along the circumferential direction, oil outlet holes are respectively formed in two ends of the casing in the length direction and correspond to the oil path branches, oil injection rings are respectively arranged at two ends of the casing, oil injection holes for cooling end windings are formed in the oil injection rings, cooling bearing nozzles are arranged at the tops of the oil injection rings and are communicated with the end cover, deep holes are formed between the end cover and a bearing chamber, oil outlets are formed in the bottom of the casing, and the bearing chamber and the windings are communicated with the oil outlets; through the mode, the oil circuit is simple in structure, the temperature of each part is effectively reduced by adopting the design of the shell oil circuit, the bearing cooling and the end cooling, the system is reliable, the manufacturing cost is low, and the existing less motor oil cooling structure system is enriched.

Description

Oil cooling motor structure

Technical Field

The utility model relates to the technical field of motors, in particular to an oil cooling motor structure.

Background

With the development of new energy automobile motors, higher and higher requirements are put forward on the power density of the motors, and in order to improve the power density of the motors, the higher the rotating speed of the new energy automobile motor is, the better the quality is, the lighter the better the current is, and the better the current is; and as the rotating speed is higher, the iron loss is higher, the current is higher, the copper loss is higher, and the temperature rise of the motor is higher; as the power density of the motor is higher and higher, the motor has the risk of demagnetizing the magnetic steel and damaging the bearing due to the too high temperature rise, so as the power density of the motor is developed towards higher and higher targets, higher requirements are put on the thermal management design of the motor.

The water cooling or air cooling is a main flow heat radiation mode of the current motor, but the heat source cannot be directly cooled, the heat at the winding can be transmitted to the shell through the insulation layer in the groove and the motor stator and is carried by the water, the transmission path is long, the heat radiation efficiency is low, and the matching tolerance among all the components influences the heat resistance of the transmission path, so that the oil cooling technology with higher heat radiation efficiency becomes a research hot spot.

In view of good oil insulation performance, the magnetic circuit of the motor is not influenced, the boiling point and the condensation point are higher than those of water, so that the cooling liquid is not easy to freeze at low temperature and not easy to boil at high temperature, and oil is gradually selected as a medium for internal direct cooling at present. The motor oil circuit structure designed by the existing motor manufacturer has the defect of complex structure, namely, complex structural design is needed to be carried out in the motor, and meanwhile, higher design precision is needed, and the method ensures the heat dissipation effect of the motor to a certain extent, but has a great cost in motor efficiency and structural design.

Disclosure of Invention

The utility model mainly solves the technical problems of providing an oil-cooled motor structure, which has simple oil circuit structure, adopts the design of cooling an oil circuit of a shell, cooling a bearing and cooling an end part, effectively reduces the temperature of each part, has reliable system and low manufacturing cost, and enriches the existing less motor oil-cooled structure system.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides an oil cooling motor structure, which comprises a housing, be provided with stator core, rotor core and winding in the casing, the both ends of casing set up the end cover respectively, the center pin of casing sets up the motor shaft, all be provided with the bearing between the end cover at motor shaft and both ends, the bearing is in the bearing chamber, one side of casing sets up the oil inlet, the wall thickness inside of casing extends along the circumferencial direction and sets up the oil circuit branch road, the both ends of casing length direction correspond the oil circuit branch road is provided with the oil outlet respectively, the both ends of casing set up the oil spout ring respectively, follow the cooling oil that the oil outlet flows gets into in the oil spout ring, set up the oil spout hole that is used for cooling tip winding on the oil spout ring, the top of oil spout ring sets up cooling bearing nozzle, cooling bearing nozzle intercommunication to the end cover, set up the deep hole between end cover and the bearing chamber, the casing bottom sets up the oil-out, bearing chamber and winding all communicate with the oil-out.

Preferably, the oil inlet is arranged at the middle position of the length direction of the shell, and the oil path branches at the front side and the rear side are symmetrically distributed around the oil inlet as the center.

Preferably, at least two oil circuit branches are respectively arranged on the front side and the rear side.

Preferably, oil circuit branches on the front side and the rear side extend to oil outlets corresponding to two ends of the casing, are respectively provided with a plurality of oil outlets, and are distributed along the circumferential direction of the casing.

Preferably, the number of the oil spraying holes on the oil spraying ring is multiple, and the oil spraying holes are distributed along the circumference of the oil spraying ring.

Preferably, sealing circular grooves are formed in two sides of the oil spraying ring.

Preferably, O-shaped rings are respectively arranged on two sides of the oil injection ring.

Preferably, the inner sides of the end covers arranged at the two ends of the shell are provided with drainage ribs in an extending and protruding mode.

Preferably, an oil seal is arranged between the end cover and the motor shaft.

The beneficial effects of the utility model are as follows: according to the oil-cooled motor structure, on one hand, heat generated by the stator core is effectively cooled through the design of the oil circuit branch circuit in the shell; on the other hand, through the structural collocation between oil spray ring and the casing, effectively cool off motor bearing and winding head, greatly reduced the temperature of motor and bearing, this patent adopts casing oil circuit, bearing cooling and tip refrigerated structural design promptly, has effectively reduced the temperature of each part, and whole oil circuit simple structure is reliable and stable, low in manufacturing cost has enriched current less motor oil cooling structure system, has good marketing value.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of an oil-cooled motor structure of the present utility model;

FIG. 2 is a diagram showing the distribution of the oil circuit branch inside the casing according to the present utility model;

FIG. 3 is a diagram showing the distribution of the oil circuit branch inside the casing, and the trend identification of the cooling oil is added;

FIG. 4 is a schematic view of a portion of an oil cooled motor structure embodying the position of an oil spray ring within a housing according to the present utility model;

FIG. 5 is the oil spray ring structure of FIG. 4 hidden for illustrating the manner in which oil enters the oil spray ring from the oil outlet;

FIG. 6 is a schematic view of the structure of the oil spray ring in the present utility model;

FIG. 7 is a view showing the structure of the end cap of the present utility model for embodying deep holes and drainage ribs in the end cap;

FIG. 8 is a partial schematic view of FIG. 1 illustrating the flow path of cooling oil within the electric machine;

the components in the drawings are marked as follows:

1. a housing; 2. a stator core; 3. a rotor core; 4. a winding; 5. an end cap; 6. a motor shaft; 7. a bearing; 8. an oil inlet; 9. an oil path branch; 10. an oil outlet hole; 11. an oil injection ring; 12. an oil injection hole; 13. cooling the bearing nozzle; 14. deep holes; 15. an oil outlet; 16. sealing the round groove; 17. an O-ring; 18. drainage ribs; 19. and (3) oil sealing.

Description of the embodiments

The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

Examples

As shown in fig. 1, an oil-cooled motor structure comprises a housing 1, wherein a stator core 2, a rotor core 3 and a winding 4 are arranged in the housing 1, end covers 5 are respectively arranged at two ends of the housing 1, a motor shaft 6 is arranged on a central shaft of the housing 1, bearings 7 are respectively arranged between the motor shaft 6 and the end covers 5 at two ends, the bearings 7 are arranged in bearing chambers, the conventional motor structure is not described in detail herein, and an oil seal 19 is arranged between the end covers 5 and the motor shaft 6 for improving tightness.

In addition, the casing 1 is an inner casing, and the outer casing is correspondingly arranged (not shown in the figure) outside the casing, and the casing is coated on the outer side of the casing to play a role in sealing, meanwhile, the oil path branch is complete, and a matched sealing device such as a sealing ring and the like is also arranged between the casing 1 and the casing.

As shown in fig. 2 and fig. 3, an oil inlet 8 is disposed on one side of the casing 1, oil path branches 9 are disposed in the wall thickness of the casing 1 and extend along the circumferential direction, oil outlet 10 are disposed at two ends of the casing 1 corresponding to the oil path branches 9, in order to ensure flow balance at the front and rear ends, the oil inlet 8 is disposed at a middle position of the casing 1 in the longitudinal direction, the oil path branches 9 at the front and rear sides are symmetrically distributed around the oil inlet 8, and at least two oil path branches 9 at the front and rear sides are disposed respectively.

As shown in fig. 1, 4, 5 and 6, two ends of the casing 1 are respectively provided with an oil spraying ring 11, cooling oil flowing out from the oil outlet 10 enters the oil spraying ring 11, the oil spraying ring 11 is provided with a plurality of oil spraying holes 12, the number of the oil spraying holes 12 on the oil spraying ring 11 is distributed along the circumference of the oil spraying ring 11, the cooling oil flowing out through the oil spraying holes 12 is sprayed to the winding end part for cooling the motor winding 4, a cooling bearing nozzle 13 is arranged at the top of the oil spraying ring 11, the cooling bearing nozzle 13 is communicated to the end cover 5, and the cooling oil is sprayed from the cooling bearing nozzle 13 to the end cover 5. In addition, sealing circular grooves 16 are formed in two sides of the oil spraying ring 11 and used for preventing cooling oil in the oil spraying ring from leaking from two ends, and O-shaped rings 17 are respectively arranged on two sides of the oil spraying ring 11, so that sealing effect is improved.

As shown in fig. 1, fig. 3, fig. 7 and fig. 8, a deep hole 14 is provided between the end cover 5 and the bearing chamber, cooling oil flows into the bearing chamber through the deep hole 14 on the end cover 5, in order to introduce the cooling oil sprayed into the end cover into the deep hole as far as possible, drainage ribs 18 are provided in the inner sides of the end covers 5 at the two ends of the casing 1 in an extending and protruding manner, an oil outlet 15 is provided at the bottom of the casing 1, the bearing chamber and the winding 4 are both communicated with the oil outlet 15, and the oil path flows according to the route marked in the drawing, namely: after entering the shell 1 through the oil inlet 8, cooling oil flows and circulates along the oil path branch 9, then flows out of the oil outlet 10 at two ends and enters the oil spraying ring 11, and the cooling oil entering the oil spraying ring 11 is divided into two paths to continue flowing, wherein one path is sprayed onto the rear end cover 5 from the cooling bearing nozzle 13, flows into the bearing chamber through the deep hole 14 on the end cover 5, flows out of the other side of the bearing 7, finally flows into the oil outlet 15 at the bottom of the shell 1, and the other path is sprayed into the winding end part at the rear end from the oil spraying holes 12 distributed on the oil spraying ring 11 to cool the motor winding and then flows into the oil outlet 15 at the bottom of the shell 1, the effect of cooling the bearing and the winding is realized in two paths, and the cooling flow direction of the front end is the same, so that the description is omitted.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (9)

1. The utility model provides an oil cooling motor structure, includes casing (1), be provided with stator core (2), rotor core (3) and winding (4) in casing (1), the both ends of casing (1) set up end cover (5) respectively, the center pin of casing (1) sets up motor shaft (6), all be provided with bearing (7) between end cover (5) at motor shaft (6) and both ends, bearing (7) are in the bearing room, its characterized in that: one side of casing (1) sets up oil inlet (8), the wall thickness inside of casing (1) extends along the circumferencial direction and sets up oil circuit branch road (9), the both ends of casing (1) length direction correspond oil circuit branch road (9) are provided with oil outlet (10) respectively, the both ends of casing (1) set up respectively oil spout ring (11), follow in the cooling oil that oil outlet (10) flows gets into oil spout ring (11), set up oil spout hole (12) that are used for cooling end winding (4) on oil spout ring (11), oil spout ring (11) top sets up cooling bearing nozzle (13), cooling bearing nozzle (13) communicate to end cover (5), set up deep hole (14) between end cover (5) and the bearing room, casing (1) bottom sets up oil-out (15), bearing room and winding (4) all communicate with oil-out (15).

2. An oil-cooled motor structure as set forth in claim 1, wherein: the oil inlets (8) are arranged at the middle position of the length direction of the shell (1), and oil path branches (9) at the front side and the rear side are symmetrically distributed around the oil inlets (8).

3. An oil-cooled motor structure as set forth in claim 2, wherein: at least two oil circuit branches (9) are respectively arranged at the front side and the rear side.

4. An oil-cooled motor structure according to claim 3, characterized in that: the oil path branches (9) on the front side and the rear side extend to the corresponding oil outlet holes (10) on the two ends of the casing (1) respectively, and are distributed along the circumferential direction of the casing (1).

5. An oil-cooled motor structure as set forth in claim 1, wherein: the number of the oil spraying holes (12) on the oil spraying ring (11) is multiple, and the oil spraying holes are distributed along the circumference of the oil spraying ring (11).

6. An oil-cooled motor structure as set forth in claim 5, wherein: sealing circular grooves (16) are formed in two sides of the oil spraying ring (11).

7. The oil-cooled motor structure of claim 6, wherein: o-shaped rings (17) are respectively arranged on two sides of the oil injection ring (11).

8. An oil-cooled motor structure as set forth in claim 1, wherein: the inner sides of the end covers (5) arranged at the two ends of the shell (1) are provided with drainage ribs (18) in an extending and protruding mode.

9. An oil-cooled motor structure as set forth in claim 1, wherein: an oil seal (19) is arranged between the end cover (5) and the motor shaft (6).