Motor casing

Abstract

The utility model discloses a motor casing. The motor casing comprises a casing main body, an oil path and a water path, wherein the oil path and the water path are attached to the casing main body and are arranged along the axial direction of the casing main body; the oil path is at least partially wrapped in the water path; the oil way is wrapped by the water way, the water way cools the machine shell and meanwhile fully cools the oil way, the cooling effect of the water way can be fully exerted, the temperature of oil entering the inner cavity of the motor is greatly reduced, and the cooling effect of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil-water mixed cooling motors, in particular to a motor casing. Background Art

[0002] As new energy vehicle drive motors continue to develop towards higher speed, higher power, higher torque and smaller size, increasingly stringent requirements are placed on the heat dissipation performance of the drive motors.

[0003] Currently, drive motors on the market are primarily categorized as pure water-cooled, pure oil-cooled, and mixed oil-water cooled. The current cooling scheme for mixed oil-water cooled motors involves water channels distributed throughout the motor housing, directly cooling the housing and indirectly removing heat transferred from the stator to the housing. Oil channels, on the other hand, flow through the motor's end caps into the motor's inner cavity, directly spraying the stator copper wires for cooling.

[0004] The water circuit and the oil circuit are independent systems. The water circuit and the oil circuit do not affect each other, and the water circuit and the oil circuit do not cool each other. This makes the water circuit fail to fully exert its excellent cooling performance and fails to maximize the cooling performance of the motor. Utility Model Content

[0005] The purpose of the utility model is to provide a motor casing which improves the cooling performance of the motor.

[0006] The technical solution of the utility model is to provide a motor casing, the motor casing comprising: a casing body, and an oil passage and a water passage attached to the casing body and arranged axially along the casing body;

[0007] The oil channel is at least partially wrapped in the water channel.

[0008] In a preferred embodiment, the water channel and the oil channel are both in one piece and are arranged in a winding manner on the casing body.

[0009] In a preferred embodiment, the two ends of the water circuit are connected to a water inlet and a water outlet respectively, and the two ends of the oil circuit are connected to an oil inlet and an oil outlet respectively;

[0010] The water inlet is adjacent to the oil outlet, and the water outlet is adjacent to the oil inlet so that the flow direction of the cooling water in the water circuit is opposite to the flow direction of the cooling oil in the oil circuit.

[0011] In a preferred embodiment, there are two oil outlets, which are respectively arranged on both end surfaces of the casing body.

[0012] In a preferred embodiment, there are at least two water circuits and at least two oil circuits, and the end of the casing body is equipped with a water inlet channel and a water outlet channel connected to the water circuit, and an oil inlet channel and an oil outlet channel connected to the oil circuit.

[0013] In a preferred embodiment, the water channel and the oil channel are parallel to each other;

[0014] The water inlet channel connected to each water channel and the oil inlet channel connected to the oil channel it encloses are located at different ends of the casing body, so that the cooling water in each water channel flows in the opposite direction to the cooling oil in the oil channel it encloses;

[0015] The water inlet passages connected to the two adjacent water channels are located at different ends of the casing body, so that the cooling water in the two adjacent water channels flows in opposite directions.

[0016] In a preferred embodiment, the water channel and the oil channel each have i*n channels (i>1, n>1), and the i adjacent water channels form a group;

[0017] The water inlet channel connected to each water channel and the oil inlet channel connected to the oil channel it encloses are located at different ends of the casing body so that the cooling water in each water channel flows in the opposite direction to the cooling oil in the oil channel it encloses;

[0018] The water inlet channels connected to each group of water channels are located at the same end of the casing body so that the cooling water in each group of water channels flows in the same direction, and the water inlet channels connected to two adjacent groups of water channels are located at different ends of the casing body so that the cooling water in the two adjacent groups of water channels flows in opposite directions.

[0019] In a preferred embodiment, the cross section of the water channel is a closed annular cross section or an annular cross section with an opening, and the cross section of the oil channel is independently arranged in the annular cross section.

[0020] In a preferred embodiment, when the cross section of the water channel is a ring-shaped cross section with an opening, the opening of the ring-shaped cross section of the water channel faces the outer peripheral surface of the casing body.

[0021] In a preferred embodiment, heat dissipation ribs are provided on the outer peripheral surface of the water channel and / or the oil channel.

[0022] The advantages of the present invention are: providing a motor casing, the motor casing comprising: a casing main body and an oil circuit and a water circuit arranged axially along the casing main body; the oil circuit is at least partially wrapped in the water circuit; the oil circuit is wrapped by the water circuit, and the water circuit fully cools the oil circuit while cooling the casing, which can give full play to the cooling effect of the water circuit, greatly reduce the temperature of the oil entering the inner cavity of the motor, and improve the cooling effect of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A three-dimensional diagram of the motor housing provided in Example 1 of the present utility model;

[0025] Figure 2 A schematic diagram of the water and oil circuits in the motor housing provided in Example 1 of the present utility model;

[0026] Figure 3 A first end view of the motor housing provided in Example 1 of the present utility model;

[0027] Figure 4 A second end view of the motor housing provided in Example 1 of the present utility model

[0028] Figure 5 A schematic cross-sectional view of the water and oil circuits in the motor housing provided by an embodiment of the present utility model;

[0029] Figure 6 A cross-sectional schematic diagram of heat dissipation ribs provided on the water and oil channels in the motor housing according to an embodiment of the present utility model;

[0030] Figure 7 A schematic diagram of the water and oil circuits in the motor housing provided by an embodiment of the present utility model;

[0031] Figure 8 A three-dimensional diagram of a motor housing provided in Example 2 of the present utility model;

[0032] Figure 9 A schematic diagram of the water and oil circuits in the motor housing provided in Example 2 of the present utility model;

[0033] Figure 10 A schematic diagram of a mixing flow channel in a motor housing provided in Example 2 of the present utility model;

[0034] Figure 11 A schematic diagram of the water and oil circuits in the motor housing provided by Example 4 of the present utility model;

[0035] Figure 12 A schematic diagram of a mixing flow channel in a motor housing provided in Example 4 of the present utility model;

[0036] Among them: 1. Casing body; 2. Oil circuit; 21. Oil outlet; 22. Oil inlet; 3. Water circuit; 31. Water outlet; 32. Water inlet; 4. Heat dissipation ribs; 5. First end cover; 6. Second end cover. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] As described in the background technology, in the prior art, the water circuit and the oil circuit are independently arranged. The water circuit directly cools the casing, while the oil circuit enters the motor cavity to spray cool the stator copper wire. The oil circuit and the water circuit do not affect each other, and the heat dissipation performance of the motor is limited.

[0039] To solve the above problems, the present application creatively proposes a motor casing in which the oil circuit is wrapped by a water circuit. Since the cooling water circuit of the motor comes from the cooling water circuit of the entire vehicle, the flow rate is large and the temperature is constant. The water circuit cools the casing while fully cooling the oil circuit, which can give full play to the cooling effect of the water circuit, greatly reduce the temperature of the oil entering the inner cavity of the motor, and improve the cooling effect of the motor.

[0040] The solution of this application will be described in detail below with reference to the accompanying drawings and various embodiments.

[0041] Example 1: This example introduces the structure of the motor housing in this application.

[0042] Specifically, this embodiment provides a motor casing, which includes: a casing body 1 and an oil circuit 2 and a water circuit 3 attached to the casing body 1 and arranged axially along the casing body 1; the oil circuit 2 is at least partially wrapped in the water circuit 3.

[0043] The cooling oil in oil circuit 2 enters the motor casing, cools the stator assembly installed there, and then circulates back into oil circuit 2. Water circuit 3 surrounds oil circuit 2. The cooling water flowing in water circuit 3 cools the cooling oil in oil circuit 2 while simultaneously cooling the casing body 1. This fully utilizes the cooling effect of the water circuit, significantly reducing the temperature of the oil entering the motor cavity and improving the cooling effect of the motor. Oil circuit 2 and water circuit 3 are attached to casing body 1, and can be attached to the outer surface of casing body 1, attached to the inner surface of casing body 1, or arranged between the inner and outer surfaces of casing body 1.

[0044] In this embodiment, referring to Figure 1 and Figure 2 As shown, the water channel 3 and the oil channel 2 are both in one path and are arranged in a winding manner on the housing body 1. Figure 2 As shown, the oil circuit 2 and the water circuit 3 both include an axial flow channel arranged along the axial direction of the casing body 1 and a circumferential flow channel arranged along the circumference of the casing body 1. The circumferential flow channel connects the ends of two adjacent axial flow channels to form a Z-shaped passage winding around the circumference of the casing body.

[0045] like Figure 1 As shown, the two ends of the water channel 3 are connected to a water inlet 31 and a water outlet 32, respectively. The two ends of the oil channel 2 are connected to an oil inlet 21 and an oil outlet 22, respectively. The water inlet 31 and the oil outlet 22 are positioned adjacent to each other, while the water outlet 32 ​​and the oil inlet 21 are positioned adjacent to each other, so that the cooling water in the water channel 3 flows in the opposite direction to the cooling oil in the oil channel 2. The cooling water in the water channel 3 and the cooling oil in the oil channel 2 flow in opposite directions, thereby maximizing the cooling effect of the water channel 3 on the oil channel 2.

[0046] Preferably, combined Figure 3 and Figure 4 As shown, there are two oil outlets 22, one located at each end face of the housing body 1. The end of the oil circuit 2 connects to the two oil outlets 22, which are located on the end faces of the housing body 1. Cooling oil flows out from the end faces of the housing body 1 and enters the motor through the end caps at both ends of the housing body 1 to cool the stator and windings installed in the housing body 1.

[0047] The cross-section of the water channel 3 is a closed annular cross-section or an annular cross-section with an opening, and the cross-section of the oil channel 2 is independently arranged within the annular cross-section. For example, referring to Figure 5, the cross-section of the water channel 3 can be a closed circular annular cross-section, a rectangular annular cross-section, an elliptical annular cross-section, or an irregular annular cross-section, and the cross-section of the oil channel 2 can be circular, rectangular, trapezoidal, elliptical, etc. The present invention does not impose any specific restrictions on this, as long as the water channel 3 can surround the oil channel 2.

[0048] Preferably, when the cross-section of the water channel 3 is an annular cross-section with an opening, the opening of the annular cross-section of the water channel 3 faces the outer peripheral surface of the casing body 1. That is, when the water channel 3 does not enclose the oil channel 2, the water channel 3 is arranged between the oil channel 2 and the inner peripheral surface of the casing body 1. The water channel 3 is close to the inner side of the motor casing, which can remove more heat from the stator assembly installed in the motor casing. At the same time, the water channel 3 fully cools the oil channel 2 by enclosing the oil channel 2, so that the temperature of the cooling oil in the oil channel 2 is lower after entering the motor casing, and the cooling effect on the stator assembly is better.

[0049] Preferably, refer to Figure 6 As shown, heat dissipation ribs 4 are provided on the outer circumference of the water channel 3 and / or the oil channel 2. Specifically, the heat dissipation ribs 4 are provided on the outer circumference of at least one of the water channel 3 and the oil channel 2 to increase the outer circumferential surface area, thereby further improving heat exchange efficiency. The heat dissipation ribs 4 can be in any shape that increases the outer circumferential surface area, such as an arc-shaped or sawtooth-shaped protrusion, and are not specifically limited in this invention.

[0050] In the motor casing provided by this embodiment, the oil circuit and the water circuit are arranged along the axial direction of the casing body and meander around the circumference of the casing body. The oil circuit and the water circuit flow in opposite directions. The cooling oil enters the motor from both ends through the external end covers to cool the stator and windings in the motor. The water circuit is arranged close to the inner side of the casing. At least one of the oil circuit and the water circuit is provided with heat dissipation ribs, which can fully cool the oil circuit by the water circuit, so that the temperature of the oil in this oil circuit is lower after entering the motor, and the cooling of the motor stator winding is better.

[0051] Embodiment 2: This embodiment provides a motor housing, which differs from the above-mentioned embodiment 1 in that:

[0052] In this embodiment, combined with Figures 8-10 As shown, both the water circuit 3 and the oil circuit 2 have at least two channels. The end of the housing body 1 is equipped with a water inlet and outlet channel (not shown) communicating with the water circuit 3, as well as an oil inlet and outlet channel (not shown) communicating with the oil circuit 2. Switching between the ends of the water circuit 3 and the oil circuit 2 is not accomplished on the housing body 1, but rather through an end cap connected to the end of the housing body 1.

[0053] Preferred reference Figure 9 As shown, the water channel 3 and the oil channel 2 are parallel to each other, which is easier to manufacture; the water inlet channel connected to each water channel 3 and the oil inlet channel connected to the oil channel 2 it wraps are located at different ends of the casing body 1, so that the cooling water in each water channel 3 flows in the opposite direction to the cooling oil in the oil channel 2 it wraps. Figure 9 and Figure 10As shown, in one embodiment, the two ends of the casing body 1 are respectively equipped with a first end cover 5 and a second end cover 6. The cooling water in the odd-numbered water channels on the casing body 1 flows from the first end cover 5 to the second end cover 6, and the oil in the oil channels wrapped by the odd-numbered water channels flows from the second end cover 6 to the first end cover 5; the cooling water in the even-numbered water channels flows from the second end cover 6 to the first end cover 5, and the oil in the even-numbered oil channels flows from the first end cover 5 to the second end cover 6; in one embodiment, the water channel 3 and the oil channel 2 meander on the casing body 1, and the end of the oil channel 2 is connected to the two oil outlets 21. Two oil outlets 21 are respectively arranged in the first end cover 5 and the second end cover 6; the first end cover 5 is provided with a water inlet channel connected to the water inlet 32 ​​of the water circuit 3, and a first oil outlet channel connected to an oil outlet 21 of the oil circuit 2; the second end cover 6 is provided with a water outlet channel connected to the water outlet 31 of the water circuit 3, an oil inlet channel connected to the oil inlet 22 of the oil circuit 2, and a second oil outlet channel connected to another oil outlet 21 of the oil circuit; wherein the first oil outlet channel is connected to the oil inlet channel, the second oil outlet channel is connected to the oil inlet channel, and the water outlet channel is connected to the water inlet channel through an external circulation component.

[0054] In the motor casing provided by this embodiment, the oil circuit and the water circuit flow in opposite directions, and the cooling oil enters the motor from both ends through the external end covers to cool the stator and windings in the motor. The water circuit is arranged close to the inner side of the casing, and at least one of the oil circuit and the water circuit is provided with heat dissipation ribs, which can fully cool the oil circuit by the water circuit, so that the temperature of the oil in this oil circuit is lower after entering the motor, and the cooling of the motor stator winding is better; and the inlet and outlet channels of the oil circuit and the water circuit are arranged in the end covers matched with the casing body, so that the connection and switching of the oil circuit and the water circuit are realized in the end covers matched with the casing body, and the manufacturing of the casing body is more convenient.

[0055] Example 3: This example provides a motor casing, which differs from the above-mentioned Example 2 in that: a plurality of water channels 3 parallel to each other are arranged on the casing main body 1, and each water channel encloses at least one oil channel 2; the cooling water in the odd-numbered water channels 3 flows from the first end cover 5 to the second end cover 6, and the oil in the odd-numbered oil channels 2 flows from the second end cover 6 to the first end cover 5; the cooling water in the even-numbered water channels 3 flows from the second end cover 6 to the first end cover 5, and the oil in the even-numbered oil channels 2 flows from the first end cover 5 to the second end cover 6. Among them, the first end cover 5 is provided with a first water inlet channel connected to the water inlet of the odd-numbered water channel, a first water outlet channel connected to the water outlet of the even-numbered water channel, a first oil outlet channel connected to the oil outlet of the odd-numbered oil channel, and a first oil inlet channel connected to the oil inlet of the even-numbered oil channel, the first water outlet channel is connected to the first water inlet channel, and the first oil inlet channel is connected to the first oil outlet channel; the second end cover 6 is provided with a second water outlet channel connected to the water outlet of the odd-numbered water channel, a second water inlet channel connected to the water inlet of the even-numbered water channel, a second oil inlet channel connected to the oil inlet of the odd-numbered oil channel, and a second oil outlet channel connected to the oil outlet of the even-numbered oil circuit, the second water outlet channel is connected to the second water inlet channel, and the second oil inlet channel is connected to the second oil outlet channel.

[0056] Example 4: This embodiment provides a motor housing, referring to Figure 11 and Figure 12 , which differs from the above-mentioned embodiment 2 in that:

[0057] In this embodiment, the water channel 3 and the oil channel 2 each have i*n channels (i>1, n>1), and i adjacent water channels 3 form a group. The water inlet channel connected to each water channel 3 and the oil inlet channel connected to the oil channel 2 it encloses are located at different ends of the casing body 1 so that the cooling water in each water channel 3 flows in the opposite direction to the cooling oil in the oil channel 2 it encloses.

[0058] The water inlet channels of each group of water channels 3 are located at the same end of the housing body 1 so that the cooling water in each group of water channels 3 flows in the same direction, and the water inlet channels of two adjacent groups of water channels 3 are located at different ends of the housing body 1 so that the cooling water in the two adjacent groups of water channels 3 flows in opposite directions. Figure 11 and Figure 12 As shown, i = 2, two adjacent water channels form a group, and n = 6, with a total of six groups arranged on the housing body 1. The cooling water in each water channel flows in the opposite direction to the cooling oil in the oil channel it surrounds, while the cooling water in two adjacent water channels within each group flows in the same direction. Of course, i and n can also be other natural numbers greater than 1, and this is not specifically limited by the present invention. The connection and conversion between the end water channels and the end oil channels is achieved on the first end cap 5 and the second end cap 6.

[0059] In the motor casing provided by this embodiment, the oil circuit and the water circuit flow in opposite directions, and the cooling oil enters the motor from both ends through the external end covers to cool the stator and windings in the motor. The water circuit is arranged close to the inner side of the casing, and at least one of the oil circuit and the water circuit is provided with heat dissipation ribs, which can fully cool the oil circuit by the water circuit, so that the temperature of the oil in this oil circuit is lower after entering the motor, and the cooling of the motor stator windings is better; and multiple oil circuits and water circuits are arranged along the axial direction of the casing body, and the connection and switching between the oil circuits and the water circuits are realized in the end covers matched with the casing body, which makes the manufacture of the casing body more convenient, and the cooling water and cooling oil flow in the same group of flow channels in the same direction, and the corresponding water inlet channels opened in the end covers are simpler.

[0060] The water channel and the oil channel in the present invention may be parallel to each other or not, may be arranged in a straight line or in a curve, may be a passage with a uniform cross section or a passage with a non-uniform cross section, as long as they do not intersect and ensure that the cooling liquid in the oil channel and the water channel flows independently.

[0061] The water channel and the oil channel can be pipelines opened on the casing, or can be separate, for example, finished pipelines installed on the casing. When there are multiple oil channels and water channels, only a part of the oil channel can be wrapped in the water channel.

[0062] It can be that one water channel wraps one oil channel, or one water channel wraps two or more oil channels at the same time. It can also be that one oil channel is surrounded by multiple water channels to wrap it.

[0063] In this specification, references to the same or similar parts between the various embodiments are sufficient to refer to each other. Each embodiment focuses on the differences from other embodiments. In addition, it should be understood that the terms "first" and "second" in this application are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0064] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any modifications based on the spirit of the main technical solution of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor housing, characterized in that: The motor housing comprises: a housing body, and an oil passage and a water passage attached to the housing body and arranged axially along the housing body; The oil channel is at least partially wrapped in the water channel; There are at least two water circuits and at least two oil circuits, and the end of the casing body is equipped with a water inlet channel and a water outlet channel connected to the water circuit, and an oil inlet channel and an oil outlet channel connected to the oil circuit; the connection switching of the water circuit end and the connection switching of the oil circuit end are realized by an end cover equipped with the end of the casing body.

2. The motor housing according to claim 1, characterized in that: The water channel and the oil channel are both in one piece and are arranged in a winding manner on the casing body.

3. The motor housing according to claim 2, characterized in that: The two ends of the water circuit are connected to a water inlet and a water outlet respectively, and the two ends of the oil circuit are connected to an oil inlet and an oil outlet respectively; The water inlet is adjacent to the oil outlet, and the water outlet is adjacent to the oil inlet so that the flow direction of the cooling water in the water circuit is opposite to the flow direction of the cooling oil in the oil circuit.

4. The motor housing according to claim 3, characterized in that: There are two oil outlets, which are respectively arranged on the two end surfaces of the casing body.

5. The motor housing according to claim 1, characterized in that: The water channel and the oil channel are parallel to each other; The water inlet channel connected to each water channel and the oil inlet channel connected to the oil channel it encloses are located at different ends of the casing body, so that the cooling water in each water channel flows in the opposite direction to the cooling oil in the oil channel it encloses; The water inlet passages connected to the two adjacent water channels are located at different ends of the casing body, so that the cooling water in the two adjacent water channels flows in opposite directions.

6. The motor housing according to claim 1, characterized in that: The water channel and the oil channel both have i*n channels (i>1, n>1), and the i adjacent water channels form a group; The water inlet channel connected to each water channel and the oil inlet channel connected to the oil channel it encloses are located at different ends of the casing body so that the cooling water in each water channel flows in the opposite direction to the cooling oil in the oil channel it encloses; The water inlet channels connected to each group of water channels are located at the same end of the casing body so that the cooling water in each group of water channels flows in the same direction, and the water inlet channels connected to two adjacent groups of water channels are located at different ends of the casing body so that the cooling water in the two adjacent groups of water channels flows in opposite directions.

7. The motor housing according to claim 1, characterized in that: The cross section of the water channel is a closed annular cross section or an annular cross section with an opening, and the cross section of the oil channel is independently arranged in the annular cross section.

8. The motor housing according to claim 7, characterized in that: When the cross section of the water channel is a ring-shaped cross section with an opening, the opening of the ring-shaped cross section of the water channel faces the outer peripheral surface of the casing body.

9. The motor housing according to claim 1, characterized in that: Heat dissipation ribs are provided on the outer peripheral surface of the water channel and / or the oil channel.

Images