An integrated mid-mounted motor

Abstract

The present invention discloses an integrated mid-mounted motor, comprising: a left end cover, a gear chamber cover, a movement, a gear set, a motor housing, and a controller housing. The gear chamber cover and the left end cover are assembled to form a gear chamber for mounting the gear set. The motor housing is mounted between the gear chamber cover and the controller housing. The movement is mounted inside the motor housing. The controller housing is fixedly assembled to one end of the motor housing. A shaft sleeve is mounted on the power output end of the movement. A pulley is mounted on one end of the shaft sleeve extending outside the controller housing. The present invention mounts the rotor on the outside and the stator on the inside. Within the same space, torque can be increased. At the same time, the gear set of the present invention reduces the number of teeth while increasing the gear ratio, thereby increasing transmission efficiency and reducing costs.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to an integrated mid-mounted motor. Background Art

[0002] In the decades since the in-wheel motor was commercialized, there have been no substantial breakthroughs in its principles and core technologies, resulting in many inherent problems that remain unsolved. These include: a common problem among all models equipped with in-wheel motors—an irrational center of gravity layout; excessive unsprung (rear fork) mass leading to poor shock absorption and a poor ride experience; excessive wheel hub moment of inertia (compared to a mid-mounted motor), which affects handling; high energy consumption resulting from this (e.g., during braking); and the motor being easily damaged by road bumps during driving. None of these issues have been effectively addressed, which is why mid-mounted motors are often used in high-performance models in the foreign trade market.

[0003] However, due to different customer needs, the mid-mounted motors currently used in the foreign trade market cannot be directly applied to the domestic two-wheeled electric vehicle market (due to different working principles, they can only provide 1:1 power assistance and cannot achieve the coexistence of pure electric, power-assisted and human-powered riding modes). At the same time, the high R&D costs and high prices also make it prohibitive for the sinking market. Therefore, after years of attempts, no complete solution has been formed;

[0004] Finally, due to the unreasonable internal structure design of the mid-mounted motor, the internal structure of the motor is complex and the internal space utilization rate is low. It is difficult to make the torque very large within the same space. The unreasonable structural design of the gear set leads to low gear transmission efficiency and increased costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is an integrated mid-mounted motor. Through the coaxial sleeve technology and in conjunction with the clutch, three coaxial rotation modes are achieved without interference with each other, thereby realizing direct motor drive of the vehicle in pure electric mode. While maximizing work efficiency, it greatly reduces resistance and gear set wear, and solves the problem of short service life of the mid-mounted motor. Within the same space, the torque can be increased and the gear ratio can be increased, thereby increasing transmission efficiency and reducing costs.

[0006] The present invention is achieved through the following technical solutions: an integrated mid-mounted motor, comprising: a left end cover, a gear chamber cover, a movement, a gear set, a motor housing, and a controller housing, wherein the gear chamber cover and the left end cover are assembled with each other to form a gear chamber for mounting the gear set, the motor housing is mounted between the gear chamber cover and the controller housing, the movement is mounted inside the motor housing, the controller housing is fixedly assembled with one end of the motor housing, a shaft sleeve is mounted on the power output end of the movement, and a pulley is mounted on one end of the shaft sleeve extending outside the controller housing;

[0007] The movement includes a stator and a rotor. The rotor is mounted on the outer end of the stator. The stator is fixedly mounted on the outside of the fixed connector. One end of the fixed connector is fixedly connected to the end face of the gear chamber cover. The entire stator is hollowed out and mounted on the outside of the sleeve. The rotor and the sleeve are assembled in a linkage structure.

[0008] A central shaft is set in the middle of the movement, and the gear set is installed on the central shaft. When the central shaft is driven by manpower, the gear set drives the shaft sleeve and the pulley to rotate, or the shaft sleeve and the pulley are driven by the rotor of the movement, or the central shaft and the movement are driven by manpower and the shaft sleeve and the pulley are driven to rotate at the same time.

[0009] As a preferred technical solution, the gear set includes a ring gear, an intermediate gear, and a duplex gear. One end of the duplex gear is fixedly mounted on the central shaft through a rotating bracket, and the intermediate gear is rotatably mounted on the central shaft. An optical axis mounting section is formed on the intermediate gear, and a one-way bearing is installed on the outside of the optical axis mounting section. The intermediate gear is engaged with the first-stage teeth of the duplex gear, and the second-stage teeth of the duplex gear are engaged with the ring gear. The outer side surface of the ring gear is fixedly mounted on the inner side surface of the left end cover.

[0010] As a preferred technical solution, the first stage teeth of the duplex teeth are larger than the second stage teeth of the duplex teeth.

[0011] As an optimal technical solution, a first ball bearing is also installed on the central shaft located on one side of the one-way bearing. The outer diameter of the first ball bearing is equal to the outer diameter of the one-way bearing, and the sleeve is installed outside the one-way bearing and the first ball bearing.

[0012] As a preferred technical solution, two second ball bearings are provided on the outside of the sleeve, and the two second ball bearings are arranged on both sides of the stator. The inner ring of the fixed connection piece is fixedly installed on one of the second ball bearings, and the motor housing is installed on the outer ring of the other second ball bearing.

[0013] As a preferred technical solution, a control board, a Hall sensor, a power supply and an alarm are also installed between the motor housing and the controller housing. The Hall sensor is installed on the central axis, and a Hall sensor disk is embedded in the middle of the left end cover. The central axis carries the Hall sensor and passes through the Hall sensor disk. The motor drive module, the alarm and the Hall sensor are all electrically connected to the control board. The speed value of the movement is controlled by the controller, and the speed value is measured by the Hall sensor and the Hall sensor disk.

[0014] As a preferred technical solution, the linkage structure between the rotor and the sleeve adopts a keyway connection.

[0015] As a preferred technical solution, the fixed connection member is fixedly assembled with the gear chamber cover by screws, and the assembly surfaces of the stator and the fixed connection member are fixed in the circumferential direction by keyways.

[0016] The beneficial effects of the present invention are as follows: a shaft sleeve is provided on the outside of the central shaft in conjunction with a one-way bearing, so that when driven by the motor, the central shaft will not rotate, while when driven by manpower, the pulley can rotate normally, and when driven by manpower, the motor drive can provide 1:1 assistance, and the same space is used to complete the three driving modes, so that only one shaft needs to be exposed on the outside of the entire machine;

[0017] The present invention utilizes coaxial sleeve drive shaft technology and a new clutch to achieve three coaxial rotation modes without interference, enabling direct motor drive in pure electric mode. This maximizes operating efficiency while significantly reducing resistance and gear set wear, thus resolving the issue of short service life for the mid-mounted motor.

[0018] The present invention installs the rotor on the outside and the stator on the inside, which can increase the torque within the same space. At the same time, the gear set of the present invention reduces the number of teeth while increasing the gear ratio, thereby increasing the transmission efficiency and reducing the cost.

[0019] The pedaling function is achieved through an innovative planetary gear transmission, which complies with relevant national regulations (GB17761-2018) and ensures smooth and effortless riding. Combined with a highly integrated structure, it can switch to a 1:1 power-assisted riding mode, and the overall structural design is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is an overall explosion diagram of the present invention;

[0023] Figure 3 It is a partial explosion diagram of the movement part of the present invention;

[0024] Figure 4 For the present invention Figure 2 Explosion diagram from another perspective;

[0025] Figure 5 For the present invention Figure 3 Explosion diagram from another perspective;

[0026] Figure 6 for Figure 1 Schematic diagram of the overall assembly after removing the shell;

[0027] Figure 7 This is the installation diagram of the middle shaft and gear assembly;

[0028] Figure 8 for Figure 7 Installation diagram after installing a one-way bearing;

[0029] Figure 9 For Figure 8 Installation diagram after the sleeve and bearing are installed;

[0030] Figure 10 For Figure 9 Installation diagram with fixed connectors installed;

[0031] Figure 11 For Figure 10 Installation diagram after the stator and rotor are installed;

[0032] Description of reference numerals:

[0033] 1. Controller housing; 2. Pulley; 3. Gear set; 4. Motor housing; 5. Rotor; 6. Stator; 7. Middle shaft; 8. Gear chamber cover; 9. Left end cover; 10. Hall sensor disk; 11. Bushing; 12. Fixed connector; 13. One-way bearing; 15. First ball bearing; 16. Second ball bearing; 31. First-stage gear; 32. Second-stage gear; 33. Rotating bracket; 34. Ring gear; 35. Intermediate gear; 351. Optical axis mounting section. DETAILED DESCRIPTION

[0034] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0035] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0036] like Figures 1-4As shown, an integrated mid-mounted motor of the present invention includes: a left end cover 9, a gear chamber cover 8, a movement, a gear set 3, a motor housing 4 and a controller housing 1. The gear chamber cover 8 and the left end cover 9 are assembled with each other to form a gear chamber for mounting the gear set 3 in the middle. The motor housing 4 is mounted between the gear chamber cover 8 and the controller housing 1. The movement is mounted inside the motor housing 4. The controller housing 1 is fixedly assembled with one end of the motor housing 4. A shaft sleeve 11 is mounted on the power output end of the movement. A pulley 2 is mounted on one end of the shaft sleeve 11 extending outside the controller housing 1.

[0037] The movement includes a stator 6 and a rotor 5. The rotor 5 is mounted on the outer end of the stator 6. The stator 6 is fixedly mounted on the outside of a fixed connector 12. One end of the fixed connector 12 is fixedly connected to the end face of the gear chamber cover 8. The entire stator 6 is hollowed out and mounted on the outside of a shaft sleeve 11. The rotor 5 and the shaft sleeve 11 are assembled in a linkage structure. The present invention installs the rotor on the outside and the stator on the inside. In the same space, the torque can be increased. At the same time, the gear set of the present invention reduces the number of teeth while increasing the gear ratio, thereby increasing the transmission efficiency and reducing the cost.

[0038] The present invention utilizes coaxial sleeve drive shaft technology and cooperates with a new clutch to achieve three coaxial rotation modes without interference, realizing direct motor drive of the vehicle in pure electric mode. While maximizing work efficiency, it greatly reduces resistance and gear set wear, thereby solving the problem of short service life of the mid-mounted motor.

[0039] A central shaft 7 is provided in the middle of the movement, and the gear set 3 is mounted on the central shaft 7. When the central shaft 7 is driven by manpower, the gear set 3 drives the sleeve 11 and the pulley 2 to rotate, or the rotor 5 of the movement drives the sleeve 11 and the pulley 2 to rotate, or the central shaft 7 and the movement are driven by manpower and simultaneously assist in driving the sleeve 11 and the pulley 2 to rotate.

[0040] like Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the gear set 3 includes a ring gear 34, an intermediate gear 35, and a duplex gear. One end of the duplex gear is fixedly mounted on the central shaft 7 via a rotating bracket 33. The intermediate gear 35 is rotatably mounted on the central shaft 7. An optical axis mounting section 351 is formed on the intermediate gear 35. A one-way bearing 13 is mounted on the outside of the optical axis mounting section 351. The intermediate gear 35 meshes with the first-stage gear 31 of the duplex gear, and the second-stage gear 32 of the duplex gear meshes with the ring gear 34. The outer side of the ring gear 34 is fixedly mounted on the inner side of the left end cover 9. The gear set 3 is mainly used when the central shaft 7 is driven manually. The entire transmission process is as follows:

[0041] The middle shaft 7 is driven by manpower to rotate, and the rotation of the middle shaft 7 drives the rotating bracket 33 and the double-linked teeth installed on the rotating bracket 33 to rotate. Since the first-stage teeth 31 of the double-linked teeth are engaged with the intermediate teeth 35, and the second-stage teeth 32 of the double-linked teeth are engaged with the ring gear 34 for transmission, the first-stage teeth 31 drive the intermediate teeth 35 to rotate. Since the one-way bearing 13 is installed on the outside of the first-stage teeth 31, when the middle shaft 7 is driven by manpower, the rotation direction of the one-way bearing 13 is in a non-rotatable state. At this time, the intermediate teeth 35 drive the one-way bearing 13 and the sleeve 11 outside the one-way bearing 13 to rotate. Since the sleeve 11 rotates and the pulley 2 is installed on the outside of the sleeve 11, when the sleeve 11 rotates, the pulley 2 will also rotate. Since the pulley 2 is connected to the rear wheel of the vehicle through a belt, the vehicle can achieve the purpose of driven motion and realize the forward movement of the vehicle. Since the rotor 5 is linked with the sleeve 11, when the middle shaft 7 is driven by manpower to rotate, the entire rotor 5 also rotates.

[0042] Among them, the first-stage teeth 31 of the duplex teeth are larger than the second-stage teeth 32 of the duplex teeth. In this embodiment, the number of teeth of the intermediate teeth 35 is 21, the number of teeth of the ring gear 34 is 93, the first-stage teeth 31 of the duplex teeth is 52, and the second-stage teeth 32 is 21. Through such a gear ratio, the number of teeth is reduced while obtaining a larger gear ratio, and the cost can also be reduced.

[0043] like Figure 8 As shown, a first ball bearing 15 is further mounted on the central shaft 7 located on one side of the one-way bearing 13. The outer diameter of the first ball bearing 15 is equal to the outer diameter of the one-way bearing 13. The sleeve 11 is mounted on the outside of the one-way bearing 13 and the first ball bearing 15. The sleeve 11 is mounted on the outside of the first ball bearing 15 and the one-way bearing 13. Therefore, when the central shaft 7 is driven manually, the one-way bearing 13 rotates in a direction that is not rotatable. At this time, the sleeve 11 can be driven to rotate accordingly. When the sleeve 11 rotates, the synchronous wheel will also rotate accordingly. The ultimate purpose of providing the one-way bearing 13 is to enable the sleeve 11 to rotate when the rotor 5 rotates. At this time, the sleeve 11 rotates in a direction that the one-way bearing 13 can rotate. Therefore, the one-way bearing 13 is used as an ordinary bearing and can rotate smoothly. At this time, since the one-way bearing 13 can rotate, it will not drive the intermediate teeth 35 to rotate, nor will it drive the double-linked teeth to rotate. Therefore, when the motor drives the synchronous wheel to rotate, the entire gear set 3 will not intervene, and there will be no mutual interference.

[0044] like Figures 9-11As shown, two second ball bearings 16 are provided on the outside of the sleeve 11. The two second ball bearings 16 are arranged on both sides of the stator 6. The inner ring of the fixed connection member 12 is fixedly mounted on one of the second ball bearings 16, and the motor housing 4 is mounted on the outer ring of the other second ball bearing 16. The fixed connection member 12 is supported by the second ball bearings 16 to realize the rolling installation of the fixed connection member 12, and the motor housing 4 is assembled by rolling with the other ball bearing.

[0045] like Figure 6 As shown, a control board, a Hall sensor, a power supply and an alarm are also installed between the motor housing 4 and the controller housing 1. The Hall sensor is installed on the central shaft 7, and a Hall sensor disk 10 is embedded in the middle of the left end cover 9. The central shaft 7 carries a Hall sensor and passes through the Hall sensor disk 10. The motor drive module, the alarm and the Hall sensor are all electrically connected to the control board. The speed value of the movement is controlled by the controller, and the speed value is measured by the Hall sensor and the Hall sensor disk 10. When the central shaft 7 is driven by manpower to rotate, the central shaft 7 rotates, so that magnetic interference is generated between the central shaft 7 and the Hall sensor disk 10, so that the Hall sensor can detect the rotation speed of the central shaft 7. At this time, the control board can obtain the speed value, and then drive the rotor 5 to achieve the same transmission ratio, thereby achieving the purpose of 1:1 power assistance. Therefore, when driven by manpower, 1:1 power assistance can be achieved by the motor part to achieve the purpose of saving effort. This is the power assistance mode among the three driving modes.

[0046] Among them, the linkage structure between the rotor 5 and the shaft sleeve 11 adopts a keyway connection. The linkage structure between the rotor 5 and the shaft sleeve 11 can also adopt other methods, such as screws, etc. Its main purpose is to make the rotor 5 and the shaft sleeve 11 linked. In this way, when the rotor 5 rotates, that is, when the motor drive is turned on, the shaft sleeve 11 will also rotate accordingly, so that the synchronous wheel can achieve the purpose of rotation. As long as the method can achieve linkage and fixation between the rotor 5 and the shaft sleeve 11, it can be applied in the present invention.

[0047] Among them, the fixed connector 12 is fixedly assembled with the gear chamber cover 8 by six screws, and the stator 6 is fixed in position by the screws, so that the stator 6 remains in a fixed installation state. The assembly surface of the stator 6 and the fixed connector 12 is fixed in the circumferential direction by a keyway, so that the stator 6 and the fixed connector 12 can complete the positioning and fixation to prevent the movement of the stator 6. Therefore, as long as the fixed connector 12 is fixed, the entire stator 6 will also be in a fixed state, thereby achieving the purpose of positioning and installing the stator 6.

[0048] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any changes or substitutions that are not conceived through creative effort should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be based on the scope of protection defined in the claims.

Claims

1. An integrated mid-mounted motor, characterized in that: include: The left end cover (9), the gear chamber cover (8), the movement, the gear set (3), the motor housing (4) and the controller housing (1), the gear chamber cover (8) and the left end cover (9) are assembled with each other, and a gear chamber for installing the gear set (3) is formed in the middle, the motor housing (4) is installed between the gear chamber cover (8) and the controller housing (1), the movement is installed inside the motor housing (4), the controller housing (1) and one end of the motor housing (4) are fixedly assembled, the power output end of the movement is installed with a shaft sleeve (11), the shaft sleeve (11) extends out of the controller housing (1) and one end is installed with a pulley (2); the movement includes a stator (6) and a rotor (5), the rotor (5) is installed on the outer end of the stator (6), and the stator (6) is fixed. It is installed on the outside of the fixed connecting member (12), one end of the fixed connecting member (12) is fixedly connected to the end face of the gear chamber cover (8), the entire stator (6) is hollowed out in the middle and installed on the outside of the shaft sleeve (11), and the rotor (5) and the shaft sleeve (11) are assembled in linkage through a linkage structure; a central shaft (7) is provided in the middle of the movement, and the gear set (3) is installed on the central shaft (7); when the central shaft (7) is driven by manpower, the shaft sleeve (11) and the pulley (2) are driven to rotate by the gear set (3), or the shaft sleeve (11) and the pulley (2) are driven to rotate by the rotor (5) of the movement, or the central shaft (7) and the movement are driven by manpower to simultaneously assist in driving the shaft sleeve (11) and the pulley (2) to rotate; The gear set (3) comprises a ring gear (34), an intermediate gear (35), and a duplex gear. One end of the duplex gear is fixedly mounted on the central shaft (7) via a rotating bracket (33). The intermediate gear (35) is rotatably mounted on the central shaft (7). An optical axis mounting section (351) is formed on the intermediate gear (35). A one-way bearing (13) is mounted on the outside of the optical axis mounting section (351). The intermediate gear (35) meshes with the first-stage gear (31) of the duplex gear. The second-stage gear (32) of the duplex gear meshes with the ring gear (34). The outer side surface of the ring gear (34) is fixedly mounted on the inner side surface of the left end cover (9). The first stage teeth (31) of the duplex teeth are larger than the second stage teeth (32) of the duplex teeth; A first ball bearing (15) is also installed on the central shaft (7) located on one side of the one-way bearing (13). The outer diameter of the first ball bearing (15) is equal to the outer diameter of the one-way bearing (13). The shaft sleeve (11) is installed outside the one-way bearing (13) and the first ball bearing (15).

2. The integrated mid-mounted motor according to claim 1, characterized in that: Two second ball bearings (16) are arranged outside the shaft sleeve (11). The two second ball bearings (16) are arranged on both sides of the stator (6). The inner ring of the fixed connection member (12) is fixedly mounted on one of the second ball bearings (16), and the motor housing (4) is mounted on the outer ring of the other second ball bearing (16).

3. The integrated mid-mounted motor according to claim 1, characterized in that: A control board, a Hall sensor, a power supply and an alarm are also installed between the motor housing (4) and the controller housing (1). The Hall sensor is installed on the central shaft (7). A Hall sensor disk (10) is embedded in the middle of the left end cover (9). The central shaft (7) carries the Hall sensor and passes through the Hall sensor disk (10). The motor drive module, the alarm and the Hall sensor are all electrically connected to the control board. The speed value of the movement is controlled by the controller, and the speed value is measured by the Hall sensor and the Hall sensor disk (10).

4. The integrated mid-mounted motor according to claim 1, characterized in that: The linkage structure between the rotor (5) and the shaft sleeve (11) is connected by a keyway.

5. The integrated mid-mounted motor according to claim 1, characterized in that: The fixed connection member (12) is fixedly assembled with the gear chamber cover (8) by means of screws, and the assembly surfaces of the stator (6) and the fixed connection member (12) are fixed in the circumferential direction by means of keyways.

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