CN112769268A - Power transmission assembly and power assembly - Google Patents
Power transmission assembly and power assembly Download PDFInfo
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- CN112769268A CN112769268A CN202011612339.9A CN202011612339A CN112769268A CN 112769268 A CN112769268 A CN 112769268A CN 202011612339 A CN202011612339 A CN 202011612339A CN 112769268 A CN112769268 A CN 112769268A
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- inner cavity
- shaft
- power transmission
- rotating shaft
- hole
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Details Of Gearings (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
A power transmission assembly comprises a rotating shaft and a toothed shaft, wherein the toothed shaft is arranged on the rotating shaft, the rotating shaft is provided with a mounting hole, an inner cavity and a liquid outlet, the mounting hole and the inner cavity are coaxially arranged along the axial direction and are mutually communicated, and the liquid outlet is communicated with the inner cavity; the gear shaft is provided with an installation part and an extension part along the axial direction, the installation part is arranged in the installation hole, the extension part is positioned in the inner cavity, the gear shaft is provided with a liquid inlet along the axial direction, the extension part is provided with a first spray hole along the radial direction of the gear shaft, and the first spray hole is communicated with the liquid inlet and the inner cavity; the rotating shaft is provided with an internal spline at the mounting hole, the mounting part is an external spline, and the external spline is matched and fixed with the internal spline. The present application further provides a power assembly. Through setting up first nozzle to oil spout in the inner chamber, realize no axial velocity of flow design, can make the heat transfer coefficient of pivot inner chamber improve to reach under the different rotational speeds cooling liquid in the inner chamber and carry out the fixed flow distribution of pivot both sides spout with fixed proportion, realize the axial even heat dissipation of rotor.
Description
Technical Field
The application relates to the technical field of motor heat dissipation, in particular to a power transmission assembly and a power assembly.
Background
The power assembly of the electric vehicle consists of three parts, namely a motor, a DC-AC inverter, a motor control system and a speed reducer, wherein in the working process of the power assembly, the inverter converts direct current into alternating current, and certain energy loss is converted into heat due to the conversion efficiency; alternating current enters the motor and is converted into mechanical energy for the rotation of the motor through electromagnetic induction, and heat energy is also generated due to the conversion efficiency; the speed reducer adjusts the high rotating speed of the motor to be low, the conversion process is also lost, and heat is generated. The heat generated by the energy conversion efficiency problem needs to be discharged out of the power assembly in time through heat dissipation, otherwise, the efficiency of the power assembly is affected.
Along with the demand of the market for the miniaturization of the power assembly, the highest rotating speed of the motor needs to be continuously increased, and the high rotating speed can cause the rise of rotor wind mill and harmonic loss, so that the high-temperature magnetic loss risk of rotor magnetic steel is increased. Therefore, the heat dissipation capacity of the high-speed rotor needs to be improved, and meanwhile, the heat dissipation design of the high-speed rotor needs to meet the requirement that the heat dissipation distribution proportion under different rotating speeds needs to be consistent with a design value, namely, the design of constant flow distribution, otherwise, local high-temperature points caused by uneven heat dissipation of certain regions of the rotor appear under certain working conditions, so that potential heat dissipation risks exist.
Disclosure of Invention
In view of the above, it is desirable to provide a power transmission assembly and a power assembly having good heat dissipation effect.
In a first aspect of the embodiment of the present application, a power transmission assembly is provided, which includes a rotating shaft and a toothed shaft, wherein the toothed shaft is disposed on the rotating shaft, the rotating shaft is provided with a mounting hole, an inner cavity and a liquid outlet, the mounting hole and the inner cavity are coaxially disposed along an axial direction and are communicated with each other, and the liquid outlet is communicated with the inner cavity; the gear shaft is provided with an installation part and an extension part along the axial direction, the installation part is arranged in the installation hole, the extension part is positioned in the inner cavity, the gear shaft is provided with a liquid inlet along the axial direction, the extension part is provided with a first spray hole along the radial direction of the gear shaft, and the first spray hole is communicated with the liquid inlet and the inner cavity; the pivot in mounting hole department is equipped with the internal spline, the installation department is the external spline, the external spline with the internal spline cooperation is fixed.
The power transmission assembly is provided with the liquid inlet and the first spray hole on the gear shaft, and the inner cavity is arranged on the rotating shaft, so that the gear shaft and the rotating shaft are quickly connected through mutual matching of the internal spline and the external spline in use, synchronous rotation of the gear shaft and the rotating shaft can be realized, the structure is simple, the processing is convenient, cooling liquid entering the inner cavity through the first spray hole of the gear shaft can uniformly dissipate heat of the cooling liquid in the inner cavity under the centrifugal action. And through setting up first nozzle to spout oil in the inner chamber, realize no axial velocity of flow design, can make the heat transfer coefficient of pivot inner chamber improve to reach the cooling liquid in the inner chamber under the different rotational speeds and carry out the fixed flow distribution of pivot both sides spout with fixed proportion, realize the axial even heat dissipation of rotor.
In one possible embodiment of the first aspect, the bore diameter of the inner cavity is larger than the bore diameter of the mounting hole. The first nozzle hole is facilitated to spray the cooling liquid in the radial direction of the inner cavity.
In a possible design of the first aspect, an iron core is disposed on the rotating shaft, the iron core is sleeved on the rotating shaft and located on the circumferential wall of the inner cavity, and the length of the inner cavity is greater than the length of the iron core in the axial direction of the rotating shaft. The length of inner chamber is greater than the setting of the length of iron core can guarantee that the inner chamber evenly dispels the heat around the countershaft.
In a possible design of the first aspect, the liquid outlet includes second nozzle holes, the second nozzle holes are disposed at two sides of the inner cavity along a radial direction of the rotating shaft, and the iron core is sleeved between the second nozzle holes at the two sides. The design of second orifice can ensure to install all realization oil spout heat dissipation in the front and back end of coil on the iron core.
In one possible design of the first aspect, a plurality of the first nozzle holes are uniformly arranged around the circumference of the extension. The uniformly arranged first spray holes can uniformly spray cooling liquid into the inner cavity.
In a possible design of the first aspect, the gear shaft and the rotating shaft are coaxially arranged, and the axes of the mounting hole, the inner cavity, and the liquid inlet coincide with the axis of the rotating shaft. The design of axis coincidence can improve power transmission assembly pivoted stability.
In a possible design of the first aspect, a first liquid outlet hole is axially formed in the other axial end face of the gear shaft, and the first liquid outlet hole is communicated with the liquid inlet and the inner cavity. The design of first play liquid hole can improve cooling liquid's flow, strengthens the radiating effect.
In one possible design of the first aspect, one side of the first nozzle hole extends to an end face of the gear shaft to communicate with the first liquid outlet hole. The communicated design can facilitate processing and lead the liquid to be stable.
In one possible embodiment of the first aspect, the axis of the first outlet opening coincides with the axis of the toothed shaft. The design of axis coincidence can improve power transmission assembly pivoted stability.
In a possible design of the first aspect, one end of the rotating shaft is further provided with a mounting groove, the mounting groove is communicated with the mounting hole, the gear shaft is further provided with a stopping portion, and the stopping portion is fixed in the mounting groove. Due to the design of the mounting groove and the stopping part, the mounting of the gear shaft can be limited, and the gear shaft can be prevented from moving axially relative to the rotating shaft.
In a second aspect of the embodiments of the present application, a power assembly is provided, which includes a motor, a reducer, an inverter, and a motor control system; the motor comprises a rotating shaft, and the rotating shaft is the rotating shaft in the power transmission assembly in the first aspect and any one of possible designs; the speed reducer is connected with the motor and comprises a gear shaft; the gear shaft is the gear shaft in the power transmission assembly according to the first aspect and any one of the possible designs, and the inverter is electrically connected with the motor; and the motor control system is electrically connected with the motor, the speed reducer and the inverter.
Drawings
Fig. 1 is a cross-sectional view of a power transmission assembly provided in a first embodiment of the present application.
Fig. 2 is a perspective view of a pinion shaft of the power transmission assembly shown in fig. 1.
Fig. 3 is a perspective view of another pinion of the power transmission assembly of fig. 1.
Fig. 4 is a perspective view of another pinion of the power transmission assembly of fig. 1.
Fig. 5 is a cross-sectional view of a power transmission assembly provided in a second embodiment of the present application.
Fig. 6 is a perspective view of a pinion of the power transmission assembly shown in fig. 5.
Fig. 7 is a cross-sectional view of a power transmission assembly provided in a third embodiment of the present application.
Fig. 8 is a cross-sectional view of a power transmission assembly provided in a fourth embodiment of the present application.
Fig. 9 is a cross-sectional view of a power transmission assembly provided in a fifth embodiment of the present application.
Description of the main elements
Second liquid outlet 131
Mounting part 21
First liquid outlet 24
Stop 25
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Hereinafter, the terms "first", "second", etc., if used, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified. "Upper," "lower," "left," "right," and like directional terms are defined relative to the schematically-disposed orientations of elements in the figures, and it is to be understood that the directional terms are relative terms, which are used for descriptive and clarity purposes and are intended to correspond to changes in the orientation in which the elements in the figures are disposed.
In the present application, the term "connected", if used, is to be understood broadly, unless otherwise explicitly stated or limited, for example "connected" may be a fixed connection, a detachable connection, or an integral part; may be directly connected or indirectly connected through an intermediate. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings, the drawings showing the partial structure of the device are not necessarily to scale, and are merely exemplary, which should not limit the scope of the invention.
Example one
As shown in fig. 1-2, a power transmission assembly 100 is provided in accordance with a first embodiment of the present application. The power transmission assembly 100 is applied to a motor and can uniformly dissipate heat of the motor.
The power transmission assembly 100 includes a rotating shaft 10 and a pinion 20. The gear shaft 20 is disposed on the rotating shaft 10. An iron core 200 is sleeved outside the rotating shaft 10. The rotating shaft 10 and the iron core 200 form a rotor of the motor.
The rotating shaft 10 is provided with a mounting hole 11, an inner cavity 12 and a liquid outlet 13, and the liquid outlet 13 includes a second liquid outlet 131 and a second nozzle 132. The mounting hole 11, the inner cavity 12 and the second liquid outlet 131 are coaxial along the axial direction of the rotating shaft 10, are sequentially communicated with each other, and penetrate through the rotating shaft 10. The mounting hole 11 is used for matching and mounting the gear shaft 20. The inner cavity 12 is used for containing a cooling liquid. The aperture of the inner cavity 12 is larger than the apertures of the mounting hole 11 and the second liquid outlet 131. The core 200 is located on the peripheral wall of the inner cavity 12, and the length of the inner cavity 12 is greater than the length of the core 200 in the axial direction of the rotating shaft. The second nozzle 132 is disposed on both sides of the inner cavity 12 along the radial direction of the rotating shaft 10. The iron core 200 is sleeved between the second nozzle holes 132 at both sides of the rotating shaft 10. The second liquid outlet 131 is connected to an external cooling liquid pipeline so that the cooling liquid passing through the rotating shaft 10 flows out.
The pinion 20 is provided with a mounting portion 21 and an extending portion 22 in the axial direction of the pinion. The mounting portion 21 is disposed in the mounting hole 11 to mount the pinion 20 to the rotating shaft 10. The extension portion 22 is located at one end of the gear shaft 20 close to the mounting portion 21, and the extension portion 22 is accommodated in the inner cavity 12. A liquid inlet 23 and a first liquid outlet 24 are further formed in the gear shaft 20 along the axial direction of the gear shaft. The liquid inlet 23 is arranged at one end of the gear shaft 20 far away from the mounting part 21. The liquid inlet 23 is connected to an external cooling liquid line for supplying cooling liquid into the pinion 20. The first liquid outlet 24 is disposed on the extension portion 22 and is communicated with the liquid inlet 23 and the inner cavity 12. Two first nozzle holes 221 are further formed in the extension portion 22. The two first nozzle holes 221 are respectively formed along the radial direction of the gear shaft 20 and are oppositely arranged. The first nozzle hole 221 is communicated with the liquid inlet 23 and the inner cavity 12.
When the cooling device is used, external cooling liquid enters the gear shaft 20 through the liquid inlet 23, most of the cooling liquid is sprayed onto the wall surface of the inner cavity 12 of the rotating shaft 10 through the first spray holes 221, the rest of the cooling liquid flows into the inner cavity 12 through the first liquid outlet holes 24, under the rotation of the rotating shaft 10, the cooling liquid in the inner cavity 12 diffuses on the wall surface of the inner cavity 12 due to the centrifugal effect and is distributed to the second spray holes 132 on two sides of the inner cavity 12, then the cooling liquid is sprayed out of the rotating shaft 10 through the second spray holes 132, and the front and the back of the end part of a coil arranged on a rotor are sprayed and radiated, so that the cooling of a motor.
The power transmission assembly 100 of the present application is through setting up the liquid inlet 23, first play liquid hole 24 and first orifice 221 on the pinion 20, and set up inner chamber 12 and second orifice 132 on the pivot 10, in use, get into the cooling liquid in the inner chamber 12 through the first play liquid hole 24 and the first orifice 221 of pinion 20, under centrifugal action, along the circumference to the wall of inner chamber 12 both sides, and through the second orifice 132 of both sides to the direct injection cooling liquid of the front and back tip of the coil of locating on the rotor, directly take away the heat that produces, thereby guaranteed the even heat dissipation to the motor. In addition, the design of the gear shaft 20 spraying oil to the inner cavity 12 can improve the surface heat exchange coefficient of the inner cavity 12 of the rotating shaft 10.
The pinion 20 is disposed coaxially with the rotating shaft 10. The axes of the mounting hole 11, the inner cavity 12, the second liquid outlet hole 131, the liquid inlet 23 and the first liquid outlet hole 24 coincide with the axis of the rotating shaft 10.
11 departments of mounting hole are equipped with the internal spline, installation department 21 is the external spline, the external spline with the internal spline passes through the spline cooperation fixed, can be in the equal small space of volume of little motor, realize the high-speed joint of pinion 20 and pivot 10, and the spline is because the number of teeth is more, the area of contact of pinion 20 and pivot 10 is big, therefore its bearing capacity is strong, can make pinion 20 and pivot 10 can both realize stable synchronous rotation under different rotational speeds, can not appear the inhomogeneous phenomenon of heat dissipation of rotor because of synchronous rotation's unstability, moreover, the steam generator is simple in structure, the processing is convenient, and splined connection's atress is comparatively even, stress concentration is few, and the guidance quality is good, can realize the coaxial setting of pinion 20 and pivot 10 fast.
And a mounting groove 15 is further formed in one side of the rotating shaft 10, which is close to the gear shaft 20. The mounting groove 15 is communicated with the mounting hole 11, and forms a step hole structure with the mounting hole 11. The gear shaft 20 is further provided with a stopper 25. The stopper portion 25 has a radius larger than that of the mounting portion 21. The stopping portion 25 is fixed in the mounting groove 15 to fix the gear shaft 20 on the rotating shaft 10, so as to prevent the gear shaft 20 from moving axially relative to the rotating shaft 10 and separating from the rotating shaft 10, and the gear shaft 20 and the rotating shaft 10 are not synchronous in rotation, which results in uneven heat dissipation.
The two second nozzle holes 132 are symmetrically formed in two sides of the inner cavity 12, and distances between the iron core 200 and the second nozzle holes 132 on the two sides are equal, so that the amount of cooling liquid sprayed out through the second nozzle holes 132 is kept uniform, and uniform heat dissipation of the coil is facilitated.
In one embodiment, the iron core 200 and the rotating shaft 10 are press-fitted together.
As shown in fig. 3, in one embodiment, the first nozzle holes 221 are three and are uniformly arranged around the circumference of the extension portion 22. The number of the first nozzle holes 221 may also be one or more than three, and a plurality of the first nozzle holes 221 are arranged around the circumference of the extension 22.
As shown in fig. 4, in an embodiment, the opening of the first nozzle hole 221 is elongated, and one side of the first nozzle hole 221 extends to the end of the gear shaft 20 and directly communicates with the first liquid outlet hole 24.
The shape of the first nozzle hole 221 may also be other shapes, such as an oval, a diamond, etc.
The cooling liquid in the present embodiment may be a cooling oil, in particular a low viscosity cooling oil. Other cooling liquids suitable for use in electrical machines, and in particular in electronic equipment, may also be selected.
Example two
As shown in fig. 5 and 6, a power transmission assembly 300 according to a second embodiment of the present application is provided.
The power transmission assembly 300 is substantially identical to the power transmission assembly 100. The main differences from the power transmission assembly 100 in the first embodiment shown in fig. 1 are: the gear shaft 20 of the power transmission assembly 300 is not provided with the first liquid outlet hole 24.
When the cooling device is used, external cooling liquid enters the gear shaft 20 through the liquid inlet 23, the cooling liquid is sprayed onto the wall surface of the inner cavity 12 of the rotating shaft 10 through the first spray holes 221, under the rotation of the rotating shaft 10, the cooling liquid in the inner cavity 12 is diffused on the wall surface of the inner cavity 12 due to centrifugal effect, cooling oil is sprayed to the inner cavity 12 from the radial direction of the gear shaft 20, and therefore the cooling oil can be distributed to the second spray holes 132 on the two sides of the inner cavity 12 in a fixed proportion, then the rotating shaft 10 is sprayed out through the second spray holes 132, and front and back of the end portion of a coil arranged on a rotor are sprayed and radiated, and therefore cooling of a motor is.
According to the power transmission assembly 300, the liquid inlet 23 and the first spray holes 221 are formed in the gear shaft 20, the inner cavity 12 and the second spray holes 132 are formed in the rotating shaft 10, in use, cooling liquid entering from the liquid inlet 23 is sprayed to the wall surface of the inner cavity 12 through the first spray holes 221 of the gear shaft 20, the cooling liquid in the inner cavity 12 is distributed to the wall surfaces on two sides according to a fixed proportion under the centrifugal action, the cooling liquid with the fixed proportion is directly sprayed to the front end portion and the rear end portion of the coil arranged on the rotor through the second spray holes 132 on the two sides, heat generated by the coil is directly taken away, uniform heat dissipation of a motor is guaranteed, the distribution proportion of the cooling liquid in the inner cavity 12 is irrelevant to the flow of the cooling liquid, and heat dissipation can be more stable.
EXAMPLE III
As shown in fig. 7, a power transmission assembly 400 according to a third embodiment of the present application is provided.
The power transmission assembly 400 is substantially identical to the power transmission assembly 100. The main differences from the power transmission assembly 100 in the first embodiment shown in fig. 1 are: the rotating shaft 10 of the power transmission assembly 400 is not provided with the second nozzle hole 132.
During the use, outside cooling liquid passes through inlet 23 and gets into in the pinion 20, and most cooling liquid spouts on the wall of the inner chamber 12 of pivot 10 through first orifice 221, and remaining cooling liquid flows into inner chamber 12 through first play liquid hole 24, and under the rotation of pivot 10, the cooling liquid in inner chamber 12 is because centrifugal action, spreads on the wall of inner chamber 12 to go out liquid hole 131 through the second and flow, evenly dispel the heat to pivot 10, thereby realize the cooling to the motor.
The power transmission subassembly 400 of this application is through setting up inlet 23 on pinion 20, first play liquid hole 24 and first orifice 221, and set up inner chamber 12 in pivot 10, in use, the first cooling liquid that goes out in liquid hole 24 and the first orifice 221 entering inner chamber 12 through pinion 20, under centrifugal action, along the wall of circumference to inner chamber 12 both sides to both sides distribution, and flow out through second play liquid hole 131, take away the heat in the pivot 10, thereby guaranteed the even heat dissipation to the motor. In addition, the design of the gear shaft 20 spraying oil to the inner cavity 12 can improve the surface heat exchange coefficient of the inner cavity 12 of the rotating shaft 10, and further improve the heat dissipation of the rotating shaft 10.
Example four
As shown in fig. 8, a power transmission assembly 500 according to a fourth embodiment of the present application is provided.
The power transmission assembly 500 is substantially identical to the power transmission assembly 100. The main differences from the power transmission assembly 100 in the first embodiment shown in fig. 1 are: the rotating shaft 10 of the power transmission assembly 500 is further provided with a fixing plate 30.
Specifically, the iron core 200 is formed by punching and laminating silicon steel sheets, and in order to improve the structural stability of the iron core, at least one end of the rotating shaft 10 is provided with a fixing plate for fixing the silicon steel sheets. In addition, the fixed plate 30 can correct the dynamic balance of the rotor during rotation, so that the rotor can run more safely and stably. In a specific setting, the diameter of the fixing plate 30 may be designed to be slightly smaller than the diameter of the iron core 200, or designed to be equal to the diameter of the iron core 200, so as to facilitate the subsequent complete motor assembly. The fixing plate 30 is formed with a flow passage 31 so that at least one end of the rotation shaft 10 can extend into the core 200 through the corresponding flow passage 31. Of course, in order to further improve the structural stability of the power transmission assembly 500 and improve the heat dissipation effect to the end of the rotating shaft 10, in the embodiment of the present application, the fixing plates 30 may be fixed to both sides of the rotating shaft 10, respectively.
One side of the flow passage 31 near the rotating shaft 10 communicates with the second nozzle hole 132 of the rotating shaft 10, and the other side of the flow passage 31 opens on the circumferential surface of the fixing plate 30.
The flow channel 31 may be a groove-shaped flow channel formed in an end surface of one side of the fixing plate 30, which is attached to the end of the iron core 200, and when the fixing plate 30 is fixed and pressed against the iron core 200, the groove-shaped flow channel may be communicated with the second nozzle 132 of the rotating shaft 10 and sealed in the circumferential direction. Of course, the flow passage 31 may be a hole-shaped flow passage opened inside the fixed plate 30.
When the cooling device is used, external cooling liquid enters the gear shaft 20 through the liquid inlet 23, most of the cooling liquid is sprayed onto the wall surface of the inner cavity 12 of the rotating shaft 10 through the first spray holes 221, the rest of the cooling liquid flows into the inner cavity 12 through the first liquid outlet holes 24, under the rotation of the rotating shaft 10, the cooling liquid in the inner cavity 12 diffuses on the wall surface of the inner cavity 12 due to the centrifugal action and is distributed to the second spray holes 132 on two sides of the inner cavity 12, then enters the flow channels 31 of the fixing plate 30, and flows into the iron core from the flow channels 31 under the centrifugal action in the fixing plate 30, so that the cooling of the rotor is realized.
EXAMPLE five
As shown in fig. 9, a power transmission assembly 600 according to a fifth embodiment of the present application is provided.
The power transmission assembly 600 is substantially identical to the power transmission assembly 300. The main differences from the power transmission assembly 300 in the second embodiment shown in fig. 5 are: the rotating shaft 10 of the power transmission assembly 600 is not provided with the second liquid outlet 131.
When the cooling device is used, external cooling liquid enters the gear shaft 20 through the liquid inlet 23, the cooling liquid is sprayed onto the wall surface of the inner cavity 12 of the rotating shaft 10 through the first spray holes 221, under the rotation of the rotating shaft 10, the cooling liquid in the inner cavity 12 is diffused on the wall surface of the inner cavity 12 due to centrifugal effect, cooling oil is sprayed to the inner cavity 12 from the radial direction of the gear shaft 20, and therefore the cooling oil can be distributed to the second spray holes 132 on the two sides of the inner cavity 12 in a fixed proportion, then the rotating shaft 10 is sprayed out through the second spray holes 132, and front and back of the end portion of a coil arranged on a rotor are sprayed and radiated, and therefore cooling of a motor is.
According to the power transmission assembly 600, the liquid inlet 23 and the first spray holes 221 are formed in the gear shaft 20, the inner cavity 12 and the second spray holes 132 are formed in the rotating shaft 10, in use, cooling liquid entering from the liquid inlet 23 is sprayed to the wall surface of the inner cavity 12 through the first spray holes 221 of the gear shaft 20, the cooling liquid in the inner cavity 12 is distributed to the wall surfaces on two sides according to a fixed proportion under the centrifugal action, the cooling liquid with the fixed proportion is directly sprayed to the front end portion and the rear end portion of the coil arranged on the rotor through the second spray holes 132 on the two sides, heat generated by the coil is directly taken away, uniform heat dissipation of a motor is guaranteed, the distribution proportion of the cooling liquid in the inner cavity 12 is irrelevant to the flow of the cooling liquid, and heat dissipation can be more stable.
The embodiment of the application still provides a power assembly, power assembly includes motor, reduction gear, dc-to-ac converter and motor control system, the motor includes the rotor, locates coil and shell on the rotor, the rotor includes pivot 10 and iron core 200. The speed reducer comprises a gear shaft 20, an input gear and an output gear, wherein the gear shaft 20 is arranged on the rotating shaft, and the input gear is arranged on the gear shaft 20. The output gear is meshed with the input gear. The inverter is electrically connected with the motor. The motor control system is electrically connected with the motor, the speed reducer and the inverter and used for controlling the motor, converting direct current into alternating current and inputting the alternating current into the motor. The rotating shaft 10 and the gear shaft 20 are the rotating shaft 10 and the gear shaft 20 in the power transmission assembly 100, 300 or 400.
The power assembly of this application, through using above-mentioned power transmission subassembly, can be when the big moment of torsion of low-speed, through the radial oil spout of pinion 20, realize the even heat dissipation of coil to can be 18000 at the rotational speed and change, when using low viscosity oil to cool off, make the surface heat transfer coefficient of pivot inner chamber promote 10%, and make power assembly's the highest temperature reduce 5 ℃.
The power assembly can be applied to electric devices such as common electric vehicles/Electric Vehicles (EV), pure electric vehicles (PEV/BEV), Hybrid Electric Vehicles (HEV), extended range electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), new energy vehicles (Renewable Vehicle), electric buses, electric motorcycles and the like.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the disclosure of the present application.
Claims (11)
1. The utility model provides a power transmission subassembly, includes pivot and pinion, the pinion is located in the pivot, its characterized in that:
the rotating shaft is provided with a mounting hole, an inner cavity and a liquid outlet, the mounting hole and the inner cavity are coaxially arranged along the axial direction and are communicated with each other, and the liquid outlet is communicated with the inner cavity;
the gear shaft is provided with an installation part and an extension part along the axial direction, the installation part is arranged in the installation hole, the extension part is positioned in the inner cavity, the gear shaft is provided with a liquid inlet along the axial direction, the extension part is provided with a first spray hole along the radial direction of the gear shaft, and the first spray hole is communicated with the liquid inlet and the inner cavity;
the pivot in mounting hole department is equipped with the internal spline, the installation department is the external spline, the external spline with the internal spline cooperation is fixed.
2. The power transfer assembly of claim 1, wherein the bore diameter of the internal cavity is larger than the bore diameter of the mounting hole.
3. The power transmission assembly as claimed in claim 1, wherein the shaft is provided with an iron core, the iron core is sleeved on the shaft and located on a peripheral wall of the inner cavity, and a length of the inner cavity is greater than a length of the iron core in an axial direction of the shaft.
4. The power transmission assembly as claimed in claim 3, wherein the liquid outlet includes second nozzle holes, the second nozzle holes are disposed at both sides of the inner cavity along a radial direction of the rotating shaft, and the iron core is sleeved between the second nozzle holes at both sides.
5. The power transfer assembly of claim 1, wherein the first nozzle holes are evenly arranged around a circumference of the extension.
6. The power transfer assembly of claim 1, wherein the pinion is disposed coaxially with the shaft, and the axes of the mounting hole, the internal cavity, and the liquid inlet coincide with the axis of the shaft.
7. The power transmission assembly as claimed in claim 1, wherein a first liquid outlet hole is axially formed in the other axial end surface of the pinion shaft, and the first liquid outlet hole is communicated with the liquid inlet and the inner cavity.
8. The power transmission assembly of claim 7, wherein one side of the first nozzle hole extends to an end surface of the pinion to communicate with the first liquid outlet hole.
9. The power transfer assembly of claim 7, wherein an axis of the first exit hole is coincident with an axis of the pinion.
10. The power transmission assembly as claimed in claim 1, wherein the shaft further has a mounting groove at one end thereof, the mounting groove communicating with the mounting hole, and the pinion further has a stopper portion fixed in the mounting groove.
11. A powertrain, comprising:
a motor including a rotating shaft in the power transmission assembly of any one of claims 1 to 10;
a speed reducer connected to the motor and including a gear shaft, the gear shaft being the gear shaft in the power transmission assembly according to any one of claims 1 to 10;
the inverter is electrically connected with the motor;
and the motor control system is electrically connected with the motor, the speed reducer and the inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011612339.9A CN112769268A (en) | 2020-12-30 | 2020-12-30 | Power transmission assembly and power assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| EP4106151A1 (en) * | 2021-06-14 | 2022-12-21 | Volvo Car Corporation | Electric machine |
| WO2023198385A1 (en) * | 2022-04-13 | 2023-10-19 | Bayerische Motoren Werke Aktiengesellschaft | Cooling-fluid-guiding rotor shaft for a rotor of an electric machine with impact wall |
| EP4362286A1 (en) * | 2022-10-31 | 2024-05-01 | Valeo eAutomotive Germany GmbH | Electric drive assembly system and vehicle |
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