A liquid-cooled inner rotor motor driven through a gearbox

Abstract

The present invention relates to the technical field of liquid cooling of inner rotor motors, and discloses a liquid-cooled inner rotor motor driven by a gearbox, comprising a gearbox and an inner rotor motor, wherein the inner rotor motor is mounted on the gearbox, wherein the gearbox is composed of a left housing and a right housing, wherein coolant is stored inside the gearbox and the inner rotor motor, and a guide channel is provided inside the gearbox for flowing the coolant. The present invention not only injects coolant into the inner rotor motor and the gearbox, and with the cooperation of a liquid-cooled drive component, the coolant circulates in the inner rotor motor and the gearbox, thereby dissipating heat more efficiently for the rotor inside the inner rotor motor, but also the liquid-cooled drive component of the present invention provides power for the coolant by utilizing the rotational motion of the internal gears meshing with each other during operation of the entire vehicle and the gravity difference between high and low positions, thereby eliminating the cost and risk increase caused by an oil pump and additional circuits, and making the process installation and implementation more convenient.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling of inner rotor motors, and in particular to a liquid-cooled inner rotor motor driven by a gearbox. Background Art

[0002] The inner rotor motors in electric vehicles currently on the market will experience a decrease in kinetic energy conversion efficiency due to rising temperatures during use. High temperatures can lead to a decrease in vehicle performance and endurance, while also accelerating the aging and damage of the motor's internal components. Therefore, to address the impact of high temperatures during operation, conventional motor cooling methods are currently divided into two main types:

[0003] 1. Method 1: air cooling, which mainly relies on the fan at the rear of the motor shaft to drive the airflow to the housing during operation to achieve the purpose of air cooling and heat dissipation. The airflow generated by the fan is mainly aimed at the end cover at the rear of the motor, and cannot play a good heat dissipation effect on the internal winding, rotor, and magnets;

[0004] 2. Method 2: Pumped liquid cooling. This method mainly adds an oil pump near the power system to provide power to the coolant. The coolant circulates to remove the heat inside the motor to the surface of the housing. This method has a better heat dissipation effect than method 1, but it increases the difficulty of motor installation. It requires a separate power supply for the oil pump and the layout of the oil pipeline, which increases the difficulty of realizing product processability. At the same time, the oil pump, circuit and pipeline also increase the additional material cost of the entire drive system.

[0005] Therefore, those skilled in the art provide a liquid-cooled inner rotor motor driven by a gearbox to solve the problems raised in the above background technology. Summary of the Invention

[0006] Technical problems solved

[0007] In view of the shortcomings of the existing technology, the present invention provides a liquid-cooled inner rotor motor driven by a gearbox, which is mainly used to solve the problem that the kinetic energy conversion efficiency of the inner rotor motor decreases due to the increase in temperature during use.

[0008] Technical Solution

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A liquid-cooled inner rotor motor driven by a gearbox comprises a gearbox and an inner rotor motor, the inner rotor motor being mounted on the gearbox, the gearbox being composed of a left housing and a right housing, coolant being stored inside both the gearbox and the inner rotor motor, a guide channel being provided inside the gearbox for allowing the coolant to flow, a delivery channel being provided inside the inner rotor motor for allowing the coolant to flow, a return channel being provided inside the gearbox and the inner rotor motor, the guide channel, the delivery channel, and the return channel being interconnected, a liquid-cooled drive assembly being provided inside the gearbox for allowing the coolant to flow, and under the action of the liquid-cooled drive assembly, the coolant enters the delivery channel through the guide channel and then flows back into the gearbox through the return channel, thereby circulating liquid cooling and cooling the inner rotor motor.

[0011] Furthermore, the inner rotor motor includes a motor housing, a stator core, a front end cover, a rear end cover, a rotor, and a motor shaft. The stator core is installed inside the motor housing, the rear end cover is installed at the rear end of the motor housing, the front end cover is installed at the front end of the motor housing, the rotor is installed inside the stator core, the motor shaft is installed on the rotor, and one end of the motor shaft passes through the front end cover and penetrates into the interior of the gearbox.

[0012] Based on the above scheme, the liquid-cooled drive assembly includes gear transmission group 1, gear transmission group 2, and gear transmission group 3. The gear transmission group 1, gear transmission group 2, and gear transmission group 3 are respectively installed inside the gearbox, and the gear transmission group 1, gear transmission group 2, and gear transmission group 3 are meshed with each other. One end of the motor shaft extends into the interior of the gearbox and meshes with the gear transmission group 1.

[0013] As a further solution of the present invention, a guide protrusion bin for storing coolant is provided above the gearbox, and the guide channel is a guide groove 1, which is installed inside the guide protrusion bin. An upper opening is provided on the inside of the guide protrusion and one side of the front end cover, and the position of the guide groove 1 corresponds to the position of the upper opening, so that the coolant flows into the upper opening through the guide groove 1 and is then transported to the inside of the motor housing.

[0014] Furthermore, the reflux channel consists of a lower opening and a guide groove 2. Two lower openings are provided inside the guide protrusion bin and on one side of the front end cover. The guide groove 2 is installed on one side of the front end cover near the two lower openings. After the coolant is transported through the delivery channel to the inner rotor motor, it flows into the lower opening through the guide groove 2 and then flows back to the interior of the gearbox.

[0015] On the basis of the above-mentioned scheme, the conveying channel includes a through hole and a flow groove. A circular flow groove is provided on one side of the front cover and the rear cover, and a plurality of through holes are provided on the annular inner side of the motor housing. The flow groove and the through hole are connected so that the coolant enters the interior of the motor housing through the opening on the front cover, passes through the through hole, flows into the flow groove in the rear cover, and then flows into the remaining through holes at the bottom of the motor housing.

[0016] Beneficial effects

[0017] Compared with the prior art, the present invention provides a liquid-cooled inner rotor motor driven by a gearbox, which has the following beneficial effects:

[0018] 1. The present invention injects coolant into the inner rotor motor and the gearbox. Then, with the cooperation of the liquid cooling drive assembly, the coolant can circulate in the inner rotor motor and the gearbox, thereby dissipating heat more efficiently for the rotor inside the inner rotor motor.

[0019] 2. Compared with the cooling method of traditional liquid-cooled power systems, the liquid-cooled drive assembly of the present invention uses the rotational motion of the internal gears meshing with each other during vehicle operation and the gravity difference between high and low positions to provide power for the coolant, eliminating the cost and risk increased by the oil pump and additional circuits. The process installation and implementation are relatively convenient, greatly improving the process manufacturability of the product.

[0020] 3. Compared with the cooling method of traditional air-cooled power systems, the liquid-cooled power system of the present invention increases the direct contact area between the coolant and the coil heat source by adding a circle of through holes inside the motor housing, transferring heat from the motor housing to the housing of the reduction gearbox through the coolant, improving the efficiency of heat transfer and increasing the heat dissipation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall schematic diagram of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0022] Figure 2 A schematic diagram of an explosion of a gearbox of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0023] Figure 3 A cross-sectional view of a gearbox of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of an explosion of an inner rotor motor of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0025] Figure 5This is a schematic cross-sectional view of a motor housing of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of a motor front end cover of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of one side of the front and rear end covers of a liquid-cooled inner rotor motor driven by a gearbox proposed by the present invention;

[0028] In the figure: 101, gearbox; 102, inner rotor motor; 201, left housing; 202, right housing; 203, gear transmission group 1; 204, gear transmission group 2; 205, gear transmission group 3; 207, guide groove 1; 301, front end cover; 302, motor housing; 303, rear end cover; 304, stator core; 305, rotor; 306, motor shaft; 307, guide groove 2; 308, circulation groove; 3011, upper opening; 3012, lower opening; 3021, through hole. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1-Figure 7 A liquid-cooled inner rotor motor driven by a gearbox includes a gearbox 101 and an inner rotor motor 102, the inner rotor motor 102 is installed on the gearbox 101, the gearbox 101 is composed of a left shell 201 and a right shell 202, and coolant is stored inside the gearbox 101 and the inner rotor motor 102. A guide channel for the coolant to flow is provided inside the gearbox 101, a delivery channel for the coolant to flow is provided inside the inner rotor motor 102, and a return channel for the coolant to flow is provided inside the gearbox 101 and the inner rotor motor 102, the guide channel, the delivery channel, and the return channel are connected, and a liquid-cooling drive component for the coolant to flow is provided inside the gearbox 101. Under the action of the liquid-cooling drive component, the coolant enters the delivery channel through the guide channel, and then flows back to the gearbox 101 through the return channel to circulate liquid cooling and cool the inner rotor motor 102.

[0031] In the present invention, the inner rotor motor 102 includes a motor housing 302, a stator core 304, a front end cover 301, a rear end cover 303, a rotor 305, and a motor shaft 306. The stator core 304 is installed inside the motor housing 302, the rear end cover 303 is installed at the rear end of the motor housing 302, the front end cover 301 is installed at the front end of the motor housing 302, the rotor 305 is installed inside the stator core 304, the motor shaft 306 is installed on the rotor 305, and one end of the motor shaft 306 passes through the front end cover 301 and penetrates into the interior of the gearbox 101. The liquid cooling drive assembly includes a gear transmission group 1 203, a gear transmission group 204, a gear transmission group 3 205, and a gear transmission group 206. The transmission group 1 203, the gear transmission group 2 204, and the gear transmission group 3 205 are respectively installed inside the gearbox 101, and the gear transmission group 1 203, the gear transmission group 2 204, and the gear transmission group 3 205 are meshed with each other. One end of the motor shaft 306 extending into the interior of the gearbox 101 is meshed with the gear transmission group 1 203. During the operation of the inner rotor motor 102, the motor shaft 306 is driven to rotate. The rotation of the motor shaft 306 causes the gear transmission group 1 203 meshed at the front end to rotate, and then the gear transmission group 2 204 and the gear transmission group 3 205 can be driven to rotate. When the liquid cooling drive component generates centrifugal force during operation, the coolant in the gearbox 101 can be thrown upward.

[0032] In the present invention, a guide protrusion bin for storing coolant is provided above the gearbox 101, and the guide channel is a guide groove 207. The guide groove 207 is installed inside the guide protrusion bin, and an upper opening 3011 is provided inside the guide protrusion bin and on one side of the front end cover 301, and the position of the guide groove 207 corresponds to the position of the upper opening 3011. The coolant flows from the gearbox 101 into the motor housing 302 through the height difference of the guide groove 207. Specifically, the coolant is thrown into the guide protrusion bin above the gearbox 101, and the coolant flows into the upper opening 3011 through the guide groove 207, and then is transported to the interior of the motor housing 302. When the coolant is thrown into the guide groove 207, the coolant flows into the upper opening 3011 in the front end cover 301 of the inner rotor motor 102 through the upper opening 3011 on the left housing 201. At this time, the coolant enters the interior of the motor housing 302.

[0033] In the present invention, the reflux channel is a lower opening 3012 and a guide groove 2 307. Two lower openings 3012 are provided inside the guide protrusion bin and on one side of the front end cover 301. The guide groove 2 307 is installed on one side of the front end cover 301 near the two lower openings 3012. After the coolant is transported through the delivery channel by the inner rotor motor 102, it flows into the lower opening 3012 through the guide groove 2 307, and then flows back to the interior of the gearbox 101. When the coolant in the gearbox 101 flows into the motor housing 302, the coolant in the motor housing 302 increases, and the coolant level begins to rise. At this time, more coolant flows into the guide groove 2 307, and then the coolant flows back to the gearbox 101 through the lower opening 3012, and the coolant completes a circulation flow.

[0034] In the present invention, the delivery channel includes a through hole 3021 and a flow groove 308. A circular flow groove 308 is provided on one side of the front cover 301 and the rear cover 303. A plurality of through holes 3021 are provided on the annular inner side of the motor housing 302. The flow groove 308 and the through hole 3021 are connected so that the coolant enters the interior of the motor housing 302 through the opening 3011 on the front cover 301, flows into the flow groove 308 in the rear cover 303 after passing through the through hole 3021, and then flows into the remaining through holes 3021 at the bottom of the motor housing 302. After passing through the through hole 3021, the coolant flows into the flow groove 308 in the rear cover 303, and then flows into the remaining through holes 3021 at the bottom of the motor housing 302, thereby increasing the flow range of the coolant, thereby increasing the direct contact area between the coolant and the heat source of the winding inside the motor housing, and improving the heat dissipation efficiency.

[0035] Working principle: In a stationary state, there is about two-thirds of coolant in the battery housing 302, and there is an appropriate amount of coolant in the gearbox 101. When the inner rotor motor 102 is working, it drives the motor shaft 306 to rotate. The rotation of the motor shaft 306 causes the front-end meshing gear transmission group 1 203 to rotate, and then drives the gear transmission group 2 204 and the gear transmission group 3 205 to rotate. When the liquid-cooled drive component is working, centrifugal force is generated, which swings the coolant in the gearbox 101 upward, and the coolant is thrown into the guide groove 1 207. Then the coolant flows into the upper opening 3011 in the front end cover 301 of the inner rotor motor 102 through the upper opening 3011 on the left housing 201. At this time, the coolant enters the motor housing 302. , flows into the circulation groove 308 in the rear end cover 303 after passing through the through hole 3021, and then flows into the remaining through holes 3021 at the bottom of the motor housing 302 to increase the flow range of the coolant, thereby increasing the heat dissipation area of ​​the coolant. Since the coolant in the gearbox 101 flows into the motor housing 302, the coolant in the motor housing 302 increases, and the coolant level begins to rise. At this time, more coolant flows into the guide groove 2 307, and then the coolant flows back to the gearbox 101 through the lower opening 3012, so that the coolant completes a circulation flow. Such a cycle can make the coolant circulate back and forth during the operation of the gearbox 101 to achieve cooling of the inner rotor motor 102.

[0036] The electrical components mentioned in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that performs control such as a computer.

[0037] In the description herein, it should be noted that relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A liquid-cooled inner rotor motor driven by a gearbox, comprising a gearbox (101) and an inner rotor motor (102), wherein the inner rotor motor (102) is mounted on the gearbox (101), and characterized in that: The gearbox (101) is composed of a left housing (201) and a right housing (202). Coolant is stored inside the gearbox (101) and the inner rotor motor (102). A guide channel for the coolant to flow is provided inside the gearbox (101). A delivery channel for the coolant to flow is provided inside the inner rotor motor (102). A return channel for the coolant to flow is provided inside the gearbox (101) and the inner rotor motor (102). The guide channel, the delivery channel, and the return channel are connected. A liquid cooling drive component for the coolant to flow is provided inside the gearbox (101). Under the action of the liquid cooling drive component, the coolant enters the delivery channel through the guide channel and then flows back into the gearbox (101) through the return channel to perform circulating liquid cooling on the inner rotor motor (102). The inner rotor motor (102) comprises a motor housing (302), a stator core (304), a front end cover (301), a rear end cover (303), a rotor (305), and a motor shaft (306); the stator core (304) is mounted inside the motor housing (302); the rear end cover (303) is mounted at the rear end of the motor housing (302); the front end cover (301) is mounted at the front end of the motor housing (302); the rotor (305) is mounted inside the stator core (304); the motor shaft (306) is mounted on the rotor (305); and one end of the motor shaft (306) passes through the front end cover (301) and into the interior of the gearbox (101); The liquid-cooling drive assembly includes a gear transmission group 1 (203), a gear transmission group 2 (204), and a gear transmission group 3 (205); the gear transmission group 1 (203), the gear transmission group 2 (204), and the gear transmission group 3 (205) are respectively installed inside the gearbox (101), and the gear transmission group 1 (203), the gear transmission group 2 (204), and the gear transmission group 3 (205) are meshed with each other; one end of the motor shaft (306) extends into the gearbox (101) and meshes with the gear transmission group 1 (203); A guide protrusion bin for storing coolant is provided above the gearbox (101), and the guide channel is a guide groove 1 (207). The guide groove 1 (207) is installed inside the guide protrusion bin, and an upper opening (3011) is provided inside the guide protrusion and on one side of the front end cover (301), and the position of the guide groove 1 (207) corresponds to the position of the upper opening (3011), so that the coolant flows into the upper opening (3011) through the guide groove 1 (207) and is then transported to the inside of the motor housing (302).

2. The liquid-cooled inner rotor motor driven by a gearbox according to claim 1, characterized in that: The reflux channel comprises a lower opening (3012) and a second guide groove (307). Two lower openings (3012) are provided inside the guide protrusion bin and on one side of the front end cover (301). The second guide groove (307) is installed on one side of the front end cover (301) near the two lower openings (3012). After the coolant is transported through the transport channel by the inner rotor motor (102), it flows into the lower openings (3012) through the second guide groove (307) and then flows back to the interior of the gearbox (101).

3. The liquid-cooled inner rotor motor driven by a gearbox according to claim 2, characterized in that: The delivery channel includes a through hole (3021) and a circulation groove (308), one side of the front cover (301) and the rear cover (303) is provided with a circular circulation groove (308), and the annular inner side of the motor housing (302) is provided with a plurality of through holes (3021), and the circulation groove (308) and the through holes (3021) are connected so that the coolant enters the interior of the motor housing (302) through the opening (3011) on the front cover (301), flows into the circulation groove (308) in the rear cover (303) after passing through the through holes (3021), and then flows into the remaining through holes (3021) at the bottom of the motor housing (302).

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