Efficient cooling system of hub motor driving wheel

Abstract

The utility model discloses an efficient cooling system of a wheel hub motor driving wheel, which can efficiently and simultaneously cool built-in components, a motor shell, a first end cover and a second end cover by filling a motor mounting space with a coolant. The air guide gap is arranged between the hub and the motor shell, the turbulent flow ribs are additionally arranged on the first end cover and the second end cover, the turbulent flow ribs can form a turbulent flow effect like rotation of fan blades, air is guided to the air guide gap, and the air cooling effect on the motor shell, the first end cover and the second end cover is greatly improved; the combination of the two greatly improves the heat dissipation performance of the hub motor, so that the performance of the electric motorcycle can be greatly improved at a low cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric motorcycle technical field, concretely relates to a kind of high-efficiency cooling system of hub motor driven wheel. BACKGROUND

[0002] The current domestic electric motorcycle popularity rate increases year by year, and there is a trend of replacing traditional motorcycle driven by internal combustion engine. The existing electric motorcycle generally adopts the driving form of hub motor, omits a large number of transmission components, and makes the vehicle structure simpler.

[0003] For the existing hub motor, the most common air cooling heat dissipation mode is adopted, that is, during the driving process of electric motorcycle, only the generated wind is used to cool the hub motor, and there is no any enhanced heat dissipation structure designed for air cooling, so that the performance of hub motor is always limited by its huge heating problem, which limits the performance improvement of electric motorcycle.

[0004] It is urgent to solve the above problems. INVENTION CONTENTS

[0005] To solve the technical problem of insufficient heat dissipation capacity of the existing hub motor, the utility model provides a kind of high-efficiency cooling system of hub motor driven wheel.

[0006] Its technical scheme is as follows:

[0007] A kind of high-efficiency cooling system of hub motor driven wheel, including wheel shaft and the hub motor shell assembly installed on wheel shaft, the hub motor shell assembly includes motor shell, hub that is synchronously rotated and surrounds the periphery of motor shell, and first end cover and second end cover that are oppositely fixed and cover on both sides of motor shell, the first end cover and second end cover can be rotatably sleeved on wheel shaft, the motor shell, first end cover and second end cover are enclosed to form motor installation space for installing hub motor, first oil seal is installed between the first end cover and wheel shaft, second oil seal is installed between the second end cover and wheel shaft, the motor installation space is filled with coolant;

[0008] The hub and motor shell are left with air guide gap, and the hub and motor shell are connected by several circumferentially uniform distribution connecting ribs, the outer peripheral surface of the first end cover and the second end cover is protruded to form multiple circumferentially uniform distribution turbulence ribs, each turbulence rib respectively extends to the air guide gap adjacent along the radial direction of corresponding first end cover or second end cover.

[0009] Compared with the prior art, the utility model has the beneficial effects:

[0010] The high-efficiency cooling system of the hub motor driven wheel fills the motor installation space with the coolant, can efficiently cool the built-in components and the motor shell, the first end cover and the second end cover at the same time, sets the air guide gap between the hub and the motor shell, and cooperates with the added turbulence ribs on the first end cover and the second end cover, so that the turbulence ribs can form the turbulence effect like the rotation of the fan blades, the wind is guided to the air guide gap, and the air cooling effect on the motor shell, the first end cover and the second end cover is greatly improved. The combination of the two greatly improves the heat dissipation performance of the hub motor, so that the electric motorcycle can realize greater performance improvement at a smaller cost. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of the hub motor driven wheel;

[0012] Figure 2 It is a sectional view of the hub motor driven wheel;

[0013] Figure 3 It is a structural schematic view of the second end cover;

[0014] Figure 4 It is a schematic view of the cooperation relationship between the speed measuring driving gear and the speed measuring driven gear;

[0015] Figure 5 It is a structural schematic view of the stator support;

[0016] Figure 6 It is a principle diagram of the coolant circulation loop. DETAILED DESCRIPTION

[0017] The utility model will be further described below in combination with the embodiments and the drawings.

[0018] As shown in Figure 1 and Figure 2 , a high-efficiency cooling system of a hub motor driven wheel mainly includes a wheel shaft 1 and a hub motor shell assembly 2 rotatably sleeved on the wheel shaft 1.

[0019] The hub motor shell assembly 2 includes a motor shell 2f, a hub 2a synchronously rotating around the outer periphery of the motor shell 2f, and a first end cover 2b and a second end cover 2c fixedly covering on both sides of the motor shell 2f. The first end cover 2b and the second end cover 2c are rotatably sleeved on the wheel shaft 1, the hub 2a is fixedly installed on the outer peripheral surface of the motor shell 2f, and the both sides of the motor shell 2f are fixedly connected with the outer edge of the first end cover 2b and the outer edge of the second end cover 2c respectively, so as to form a motor installation space enclosed by the motor shell 2f, the first end cover 2b and the second end cover 2c. The components of the hub motor are installed in the motor installation space.

[0020] The first oil seal 13 is installed between the first end cover 2b and the wheel shaft 1, and the second oil seal 14 is installed between the second end cover 2c and the wheel shaft 1, and the motor installation space is filled with coolant. Therefore, by filling the motor installation space with coolant, the components built in the motor installation space and the motor housing 2f, the first end cover 2b and the second end cover 2c can be efficiently cooled at the same time, and the heat dissipation performance of the hub motor is greatly improved.

[0021] Further, the coolant is preferably cooling oil, which can not only efficiently cool the components in the motor installation space, but also lubricate the components in the motor installation space.

[0022] In this embodiment, the motor installation space is installed with a stator support 3, a stator winding 4 and a rotor 5, the stator support 3 is synchronously rotatably sleeved on the wheel shaft 1, the stator winding 4 is synchronously rotatably sleeved on the outer circumferential surface of the stator support 3, the rotor 5 is synchronously rotatably installed on the inner circumferential surface of the motor housing 2f and can rotate under the drive of the stator winding 4, and the controller 8 is installed on the stator support 3. The cooling oil can not only efficiently cool the built-in controller 8, but also efficiently cool the coils of the stator winding 4, completely solving the heating problem of the hub motor and the controller 8, and improving the performance and braking capacity of the hub motor.

[0023] Please refer to Figures 1-3 , the first end cover 2b and / or the second end cover 2c is provided with a lens mounting hole 2d, and an observation lens 15 is sealingly installed in the lens mounting hole 2d. By installing the observation lens 15 on the first end cover 2b and / or the second end cover 2c, the coolant in the motor installation space can be observed very conveniently, which facilitates timely replenishment, so as to ensure the continuous and efficient cooling of the components in the motor installation space, especially the coils of the controller 8 and the stator winding 4.

[0024] Further, the first end cover 2b and / or the second end cover 2c is provided with a plurality of lens mounting holes 2d which are uniformly distributed in the circumferential direction. By providing a plurality of observation lenses 15, the wheel does not need to be rotated when checking the coolant, which improves the convenience of inspection.

[0025] Please refer to Figure 2 , Figure 4 and Figure 5 , the stator support 3 is recessed to form a first annular groove 3b on the side close to the second end cover 2c, and the controller 8 is installed in the first annular groove 3b, which not only ensures the reliable installation of the controller 8, but also avoids interference with the surrounding components.

[0026] The second annular groove 3c is recessed on one side of the stator support 3 close to the first end cover 2b, and a plurality of support reinforcing ribs 3d extending in the radial direction are arranged in the second annular groove 3c, and the support reinforcing ribs 3d are uniformly distributed in the circumferential direction, so as to realize lightweight design and ensure the structural strength of the stator support 3.

[0027] The bearing seat 3a is integrally formed at the bottom of the second annular groove 3c, the shaft mounting hole 3a1 communicating the first annular groove 3b and the second annular groove 3c is arranged in the bearing seat 3a, and the shaft part of the speed measuring driven gear 7 is rotatably arranged in the shaft mounting hole 3a1, so as to ensure the installation reliability of the speed measuring driven gear 7.

[0028] The tooth part of the speed measuring driven gear 7 protrudes from the second annular groove 3c, the speed measuring driving gear 6 engaged with the speed measuring driven gear 7 is synchronously rotatably sleeved on the first end cover 2b, the resolver 8a opposite to the shaft mounting hole 3a1 is integrated on the controller 8, so that the rotating speed of the shaft part of the speed measuring driven gear 7 can be detected through the resolver 8a, and the resolver 8a can be a motor encoder. Therefore, the rotating speed of the speed measuring driving gear 6 can be accurately obtained according to the rotating speed of the speed measuring driven gear 7 measured by the resolver 8a, and the rotating speed of the hub motor shell assembly 2 can be accurately obtained since the rotating speed of the hub motor shell assembly 2 is the same as the rotating speed of the speed measuring driving gear 6. Compared with the traditional mode of the Hall sensor cooperating with the magnetic ring, the detection accuracy is greatly improved, the response delay is greatly reduced, and higher use requirements are met. It should be pointed out that since the coolant is preferably cooling oil, the speed measuring driving gear 6 and the speed measuring driven gear 7 can be well lubricated.

[0029] Please refer to Figure 2 and Figure 4 The first flange ring 2f1 is arranged on both sides of the motor shell 2f, the second flange ring 2b2 matched with the corresponding first flange ring 2f1 is arranged on the outer edge of the first end cover 2b, the second flange ring 2b2 is sealingly connected with the corresponding first flange ring 2f1 through a plurality of screws, the third flange ring 2c1 matched with the corresponding first flange ring 2f1 is arranged on the outer edge of the second end cover 2c, and the third flange ring 2c1 is sealingly connected with the corresponding first flange ring 2f1 through a plurality of screws. Through the cooperation of the flange rings, the reliable connection of the motor shell 2f with the first end cover 2b and the second end cover 2c is ensured, and the sealing performance is good.

[0030] Please refer to Figure 1The first end cover 2b and the second end cover 2c are rotatably sleeved on the wheel shaft 1 through the first bearing 9, which is simple and reliable. Specifically, the inner side of the first end cover 2b is recessed to form a bearing mounting groove 2b1 matched with the first bearing 9, and the speed measuring driving gear 6 is locked on the first end cover 2b through a plurality of screws, wherein the screws are uniformly distributed in the circumferential direction to ensure the reliable connection of the speed measuring driving gear 6. The inner ring of the speed measuring driving gear 6 is integrally formed with a bearing pressing ring 6a protruding into the bearing mounting groove 2b1, and the bearing pressing ring 6a presses the first bearing 9 in the bearing mounting groove 2b1 to ensure the reliable installation of the first bearing 9.

[0031] Correspondingly, the end surface of the bearing seat 3a is provided with a bearing seat cover 11 for pressing the second bearing 10 in the shaft mounting hole 3a1 through screws, which ensures the reliable installation of the second bearing 10.

[0032] In the embodiment, the diameter of the speed measuring driving gear 6 is greater than the diameter of the speed measuring driven gear 7, and the large gear drives the small gear, which reasonably utilizes the installation space and ensures the high precision of measurement.

[0033] In addition, the stator support 3 is integrally formed as a whole, has high structural strength, good stability and long service life.

[0034] Please refer to Figure 6 The motorcycle frame is provided with a circulating pump 16 and an air-cooled radiator 17, and the motor installation space, the circulating pump 16 and the air-cooled radiator 17 constitute a coolant circulation loop through pipelines. By setting the coolant circulation loop, the coolant in the motor installation space can be efficiently cooled, and the heat dissipation performance of the hub motor is further improved. Among them, since the coolant is preferably cooling oil, the circulating pump 16 is an oil pump.

[0035] Please refer to Figure 1 and Figure 3 A wind guide gap 2g is left between the hub 2a and the motor housing 2f, and the hub 2a and the motor housing 2f are connected through a plurality of circumferentially uniformly distributed connecting ribs 2h. Each connecting rib 2h is located in the wind guide gap 2g and separates the wind guide gap 2g into a plurality of uniformly distributed large pores. The outer circumferential surface of the first end cover 2b and the second end cover 2c is protruded to form a plurality of circumferentially uniformly distributed turbulence ribs 2e, and each turbulence rib 2e extends along the radial direction of the corresponding first end cover 2b or second end cover 2c to the adjacent wind guide gap 2g. By setting the wind guide gap 2g between the hub 2a and the motor housing 2f, and cooperating with the turbulence ribs 2e added on the first end cover 2b and the second end cover 2c, the turbulence ribs 2e can form a turbulence effect like the rotation of fan blades, guiding the wind to the wind guide gap 2g, and greatly improving the air cooling effect of the motor housing 2f, the first end cover 2b and the second end cover 2c.

[0036] In this embodiment, the turbulence rib 2e includes a rib base part 2e1 protruding on the corresponding first end cover 2b or second end cover 2c, and a rib protruding part 2e2 protruding on the rib base part 2e1, the width of the rib protruding part 2e2 is smaller than the width of the adjacent rib base part 2e1. Through the design of the structure of narrow on top and wide on bottom, the turbulence effect of the turbulence rib 2e can be improved, thereby improving the air cooling effect on the motor shell 2f, the first end cover 2b and the second end cover 2c.

[0037] The rib protruding part 2e2 includes a protruding part inner segment 2e21 and a protruding part outer segment 2e22 connected in turn radially outward along the corresponding first end cover 2b or second end cover 2c, the width of the protruding part inner segment 2e21 gradually increases towards the protruding part outer segment 2e22, the width of the protruding part outer segment 2e22 gradually decreases away from the protruding part inner segment 2e21, the part side wall of the protruding part inner segment 2e21 close to the protruding part outer segment 2e22 is connected with the part side wall of the protruding part outer segment 2e22 close to the protruding part inner segment 2e21, so that the outer end of the protruding part inner segment 2e21 is staggered with the inner end of the protruding part outer segment 2e22. Through the above structure design, not only the turbulence effect of the turbulence rib 2e can be improved, thereby improving the air cooling effect on the motor shell 2f, the first end cover 2b and the second end cover 2c, but also the whole turbulence rib 2e presents a lightning structure, which is beautiful and elegant.

[0038] The rib base part 2e1 includes a base part inner segment 2e11 located at the lower part of the protruding part inner segment 2e21 and a base part outer segment 2e12 located at the lower part of the protruding part outer segment 2e22, the side of the base part inner segment 2e11 away from the protruding part outer segment 2e22 in the width direction extends to outside the protruding part inner segment 2e21, the side close to the protruding part outer segment 2e22 in the width direction is flush with the protruding part inner segment 2e21, the side of the base part outer segment 2e12 away from the protruding part inner segment 2e21 extends to outside the protruding part outer segment 2e22, and the side close to the protruding part inner segment 2e21 in the width direction is flush with the protruding part outer segment 2e22. Through numerical simulation test, the above structure can further improve the turbulence effect of the turbulence rib 2e.

[0039] In this embodiment, the first end cover 2b and the second end cover 2c are designed in an integral structure, which has high structural strength and is durable.

[0040] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0041] In the utility model, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] In the utility model, unless explicitly defined and limited otherwise, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper side" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower side" and "lower surface" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] Finally, it should be noted that the above description is only the preferred embodiment of the utility model, and ordinary skilled persons in the art can make various similar expressions under the inspiration of the utility model without violating the purpose and claims of the utility model, and such changes all fall within the protection scope of the utility model.

Claims

1. A high-efficiency cooling system for a hub motor driven wheel, comprising a wheel axle (1) and a hub motor housing assembly (2) mounted on the wheel axle (1), the hub motor housing assembly (2) comprising a motor housing (2f), a hub (2a) rotatably surrounding the outer periphery of the motor housing (2f), and a first end cover (2b) and a second end cover (2c) fixedly fitted onto both sides of the motor housing (2f), the first end cover (2b) and the second end cover (2c) being rotatably mounted on the wheel axle (1), the motor housing (2f), the first end cover (2b) and the second end cover (2c) forming a motor mounting space for mounting the hub motor, characterized in that: A first oil seal (13) is installed between the first end cover (2b) and the wheel axle (1), and a second oil seal (14) is installed between the second end cover (2c) and the wheel axle (1). The motor mounting space is filled with coolant. A guide gap (2g) is left between the hub (2a) and the motor housing (2f), and the hub (2a) and the motor housing (2f) are connected by a number of circumferentially evenly distributed connecting ribs (2h). Multiple circumferentially evenly distributed turbulence ribs (2e) are protruding on the outer circumferential surfaces of the first end cover (2b) and the second end cover (2c). Each turbulence rib (2e) extends radially along the corresponding first end cover (2b) or second end cover (2c) to the adjacent guide gap (2g).

2. The high-efficiency cooling system for the hub motor driven wheel according to claim 1, characterized in that: The edging rib (2e) includes a rib base (2e1) protruding from the corresponding first end cap (2b) or second end cap (2c) and a rib protrusion (2e2) protruding from the rib base (2e1), wherein the width of the rib protrusion (2e2) is smaller than the width of the adjacent rib base (2e1).

3. The high-efficiency cooling system for the hub motor driven wheel according to claim 2, characterized in that: The rib protrusion (2e2) includes an inner protrusion section (2e21) and an outer protrusion section (2e22) connected radially outward along the corresponding first end cap (2b) or second end cap (2c). The width of the inner protrusion section (2e21) gradually increases towards the outer protrusion section (2e22), and the width of the outer protrusion section (2e22) gradually decreases away from the inner protrusion section (2e21). A portion of the sidewall of the inner protrusion section (2e21) near the outer protrusion section (2e22) is connected to a portion of the sidewall of the outer protrusion section (2e22) near the inner protrusion section (2e21), thereby causing the outer end of the inner protrusion section (2e21) to be offset from the inner end of the outer protrusion section (2e22).

4. The high-efficiency cooling system for the hub motor driven wheel according to claim 3, characterized in that: The base of the reinforcing bar (2e1) includes an inner base section (2e11) located below the inner protrusion section (2e21) and an outer base section (2e12) located below the outer protrusion section (2e22). The inner base section (2e11) extends beyond the outer protrusion section (2e22) in the width direction on the side away from the outer protrusion section (2e22), and is flush with the inner protrusion section (2e21) in the width direction. The outer base section (2e12) extends beyond the outer protrusion section (2e22) in the width direction on the side away from the inner protrusion section (2e21), and is flush with the outer protrusion section (2e22) in the width direction.

5. The high-efficiency cooling system for the hub motor driven wheel according to claim 1, characterized in that: The first end cap (2b) and / or the second end cap (2c) are provided with a lens mounting hole (2d), and an observation lens (15) is sealed in the lens mounting hole (2d).

6. The high-efficiency cooling system for the hub motor driven wheel according to claim 5, characterized in that: The first end cap (2b) and / or the second end cap (2c) are provided with a plurality of lens mounting holes (2d) evenly distributed in the circumferential direction.

7. The high-efficiency cooling system for the hub motor driven wheel according to claim 1, 5, or 6, characterized in that: The coolant is cooling oil.

8. The high-efficiency cooling system for the hub motor driven wheel according to claim 1, characterized in that: The motor mounting space is equipped with a stator bracket (3), a stator winding (4) and a rotor (5). The stator bracket (3) is rotatably mounted on the wheel axle (1). The stator winding (4) is rotatably mounted on the outer circumferential surface of the stator bracket (3). The rotor (5) is rotatably mounted on the inner circumferential surface of the motor housing (2f) and can rotate under the drive of the stator winding (4). A controller (8) is mounted on the stator bracket (3).

9. The high-efficiency cooling system for the hub motor driven wheel according to claim 8, characterized in that: The stator support (3) has a first annular groove (3b) recessed on the side near the second end cover (2c), and the controller (8) is installed in the first annular groove (3b). The stator support (3) also has a second annular groove (3c) recessed on the side near the first end cover (2b). A bearing seat (3a) is integrally formed at the bottom of the second annular groove (3c). The bearing seat (3a) has a shaft mounting hole that connects the first annular groove (3b) and the second annular groove (3c). 3a1), the shaft of the speed-measuring driven gear (7) is rotatably mounted in the shaft mounting hole (3a1), the teeth of the speed-measuring driven gear (7) protrude from the second annular groove (3c), the first end cover (2b) is synchronously fitted with a speed-measuring drive gear (6) that meshes with the speed-measuring driven gear (7), the controller (8) is integrated with a resolver (8a) facing the shaft mounting hole (3a1), so that the rotational speed of the shaft of the speed-measuring driven gear (7) can be detected by the resolver (8a).

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