Middle motor

Abstract

The utility model relates to a built-in motor, which is particularly suitable for refitting a traditional fuel motorcycle into an electric vehicle. The centrally-mounted motor comprises a motor main body and mainly comprises an end cover, a chain wheel cover, a central shaft, a connecting disc, a chain wheel, a locking plate screw, a chain wheel locking plate, a bearing, an oil seal, an iron core bracket, an iron core, a winding and a wire harness. An end cover and a chain wheel cover of the motor are connected through end cover screws to form a closed cavity of the motor, and magnetic steel is installed on the inner wall of the steel ring and used for generating a magnetic field. The center shaft penetrates through the end cover, the chain wheel cover, the supporting connecting disc and the chain wheel, and power transmission is achieved. The internal electromagnetic part of the motor is composed of an iron core support, an iron core and a winding and is connected with an external power supply through a wire harness. The mid-motor has the advantages of compact structure, light weight, high cost performance and the like, can effectively improve the performance of a power system of the electric motorcycle, and is an ideal electric motorcycle driving scheme.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric vehicle power system technical field especially relates to a middle motor. BACKGROUND

[0002] In the current traffic field, electric vehicles have a rising market share year by year due to their environmental protection and energy saving advantages. As the core power component of electric vehicles, the performance and structural characteristics of the motor directly affect the overall performance of the vehicle.

[0003] Although the traditional middle motor can provide high running speed to meet the demand of fast driving of the vehicle, its own weight is large, which not only increases the overall weight of the vehicle, but also increases the manufacturing cost and reduces the cost performance. In some scenes with strict requirements for vehicle lightweight and cost control, the disadvantages of the traditional middle motor are more prominent, which limits its application range.

[0004] On the contrary, the traditional hub motor is compact in structure design and can realize power integration in limited space. However, due to its inherent structure, the size of the hub motor is difficult to further reduce, and in some vehicles pursuing extreme compact design, especially in the adaptation process of small and lightweight electric vehicles, the installation space is often tight, which brings trouble to the vehicle layout and design.

[0005] In addition, with the deepening of environmental protection concept, electric conversion of traditional fuel vehicles has become a popular trend. Due to the structure and adaptability problems of the existing motors on the market, it is difficult to simply and efficiently apply them to fuel vehicle conversion projects. Most of the conversion schemes need to make large-scale changes to the vehicle chassis and transmission structure, which consumes a lot of manpower, material resources and time cost. Or because the motor performance does not match the original transmission system of the vehicle, the power transmission of the converted vehicle is unstable and the driving experience is poor.

[0006] In summary, the existing motor technology cannot simultaneously consider lightness, small size, high cost performance, and easy conversion of fuel vehicles and other advantages. The market urgently needs a new type of motor that can integrate the advantages of different types of traditional motors, fill this technical gap, and provide strong support for the optimization and upgrading of electric vehicles and the convenient electric conversion of fuel vehicles. The utility model is developed and designed based on such industry background. INVENTION CONTENTS

[0007] The utility model aims at providing a new type of middle motor, overcoming the disadvantages of traditional middle motor and hub motor, combining the advantages of both, creating a motor product with high cost performance, small size, high speed performance and compact structure, and meeting the demand of convenient conversion of traditional fuel vehicles to electric vehicles.

[0008] TECHNICAL SCHEME

[0009] The motor is mainly designed around the motor, and has the following key structures:

[0010] The end cover and the sprocket cover are connected by a plurality of end cover screws which are inserted at equal distances on the outer circumferential portions of the end cover and the sprocket cover, and the end portions of the end cover screws are threadedly connected to the same steel ring, and the steel ring is tightly sealed against the end portions of the end cover and the sprocket cover. This connection mode not only ensures the stability of the structure, but also provides potential magnetic field assistance for the operation of the motor by the magnetic steel arranged on the inner wall surface of the steel ring.

[0011] The power transmission structure is inserted into the same shaft at the center positions of the end cover and the sprocket cover. The shaft is sleeved with a coupling disc at the end close to the sprocket cover, and is threadedly connected to the sprocket cover through the coupling disc screw; the coupling disc is sleeved with a sprocket at the end away from the sprocket cover, and the sprocket is stably connected to the coupling disc by using the same sprocket lock plate and the lock plate screw, and the sprocket is coaxially sleeved on the outer circumferential surface of the shaft. In this way, when the shaft rotates, the power can be accurately transmitted to the sprocket through the coupling disc, so as to be transmitted to the outside through the chain or belt in the subsequent process.

[0012] The support and sealing structure is embedded with a bearing at the center of the inner wall of the end cover, and the bearing is coaxially sleeved on the outer circumferential surface of the shaft to provide powerful support for the smooth rotation of the shaft; an oil seal is embedded at the center of the outer wall of the end cover, and the oil seal is also coaxially sleeved on the outer circumferential surface of the shaft to effectively prevent dust, water vapor and the like from entering the inside of the motor.

[0013] The power generation core structure is sleeved with an iron core support on the outer circumferential surface at the center position of the cavity formed by the shaft inside the end cover and the sprocket cover, the iron core support is sleeved with an iron core on the outer circumferential surface, the iron core is embedded with a winding inside, and the winding is connected with a wire harness which penetrates through the shaft and extends to the outside of the end cover. When the current enters the winding through the wire harness, according to the principle of electromagnetic induction, the winding generates electromagnetic force in the magnetic field environment created by the iron core, drives the iron core support to drive the shaft to rotate, and realizes power output.

[0014] Advantages

[0015] 1. Compared with the traditional in-line motor, the utility model is more portable, and the cost performance is significantly improved; compared with the traditional hub motor, the volume is smaller. The high-speed characteristics of the in-line motor and the compact structure of the hub motor are successfully combined, the power output is stable and efficient, and it can adapt to various application scenarios.

[0016] 2. In the application of vehicle modification, only the fuel engine of the traditional fuel motorcycle needs to be removed, the in-line motor is installed in the corresponding position, and the conventional belt and chain are matched, so that the fuel vehicle can be easily converted into an electric vehicle, which greatly reduces the difficulty and cost of vehicle modification, and provides a simple and easy solution for the electrification transformation of traditional fuel vehicles.

[0017] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 An internal section view structural schematic diagram of the centrally-located motor is provided for the utility model;

[0019] Fig. 2 An assembly explosion structural schematic diagram of the centrally-located motor is provided for the utility model;

[0020] Fig. 3 A side view structural schematic diagram of the centrally-located motor is provided for the utility model;

[0021] Fig. 4 A front view structural schematic diagram of the centrally-located motor is provided for the utility model.

[0022] In the figure: 1, motor; 2, connecting disc; 3, connecting disc screw; 4, chain wheel; 5, chain wheel locking piece; 6, locking piece screw; 7, chain wheel cover; 8, end cover screw; 9, steel ring; 10, magnetic steel; 11, iron core; 12, winding; 13, iron core support; 14, end cover; 15, bearing; 16, oil seal; 17, shaft; 18, wire harness. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0024] Embodiment 1, refer to Figs. 1 to 4 A centrally-located motor

[0025] Overall structure

[0026] The centrally-located motor 1 is composed of an end cover 14, a chain wheel cover 7, a center shaft 17, a connecting disc 2, a chain wheel 4, a locking piece screw 6, a chain wheel locking piece 5, a bearing 15, an oil seal 16, an iron core support 13, an iron core 11, a winding 12 and a wire harness 18. The motor is designed as a centrally-located structure, is suitable for converting a traditional fuel motorcycle into an electric vehicle, and has the advantages of compact structure, light weight, high performance-price ratio and the like.

[0027] Detailed structure and connection mode of each component

[0028] End cover 14 and chain wheel cover 7:

[0029] End cover 14: installed in one end of the motor 1, embedded with bearing 15 and provided with oil seal 16 for sealing. The outer circular part of the end cover 14 is uniformly distributed with a plurality of end cover screws 8, and the end of each screw 8 is threadedly connected with a steel ring 9.

[0030] Sprocket cover 7: installed in the other end of the motor 1, also uniformly distributed with a plurality of end cover screws 8 on the outer circular part, forming a symmetrical structure with the end cover 14.

[0031] End cover screw 8 and steel ring 9:

[0032] Each end cover screw 8 is connected with the steel ring 9 through thread, and the steel ring 9 is tightly matched with the end cover 14 and the sprocket cover 7 at both ends, ensuring the sealing of the motor closed chamber.

[0033] The inner wall surface of the steel ring 9 is provided with a magnetic steel 10 for generating a magnetic field of the motor, which interacts with the winding 12 to realize the conversion of electric energy and mechanical energy.

[0034] Center shaft 17:

[0035] The center shaft 17 penetrates the center position of the end cover 14 and the sprocket cover 7, and the outer peripheral surface of the shaft is provided with bearing 15 and oil seal 16 through coaxial sleeve, ensuring the stability and sealing of the shaft rotation.

[0036] The end of the shaft 17 close to the sprocket cover 7 is sleeved with a connecting disc 2, which is threadedly fixed with the sprocket cover 7 through connecting disc screw 3, ensuring the stable connection of the connecting disc and the sprocket cover.

[0037] Connecting disc 2 and sprocket 4:

[0038] Connecting disc 2: installed in the end of the center shaft 17 away from the sprocket cover 7, and provided with a fixed structure connected with the sprocket 4.

[0039] Sprocket 4: threadedly fixedly connected with the connecting disc 2 through lock plate screw 6. The number of lock plate screw 6 is 3, which is uniformly distributed between the connecting disc 2 and the sprocket 4.

[0040] Sprocket lock plate 5: arranged between the lock plate screw 6 and the sprocket 4, and coaxially installed with the lock plate screw 6 on the outer peripheral surface of the center shaft 17, which plays a locking role to prevent the sprocket 4 from loosening during operation.

[0041] Bearing 15 and oil seal 16:

[0042] Bearing 15: embedded in the center position of the inner wall of the end cover 14, used to support the center shaft 17, ensuring the stable rotation of the shaft.

[0043] Oil seal 16: installed in the center position of the outer wall of the end cover 14, coaxially sleeved on the outer peripheral surface of the center shaft 17, preventing leakage of lubricating oil and ensuring the sealing of the motor.

[0044] Iron core support 13, iron core 11 and winding 12:

[0045] Iron core support 13: installed in the center of the cavity formed by the center shaft 17, the outer circumferential surface of the iron core support 13 is sleeved with the iron core 11.

[0046] Iron core 11: fixed on the iron core support 13, the winding 12 is embedded inside the iron core 11, which is used to generate an electromagnetic field.

[0047] Winding 12: connected with the power supply through the wire harness 18, the wire harness 18 penetrates through the center shaft 17 and extends to the outside of the end cover 14, which is convenient for the input and output of electric energy.

[0048] Wire harness 18:

[0049] Connect the winding 12 and the external power supply to ensure that the motor 1 can obtain the required electric energy for operation.

[0050] Assembly steps

[0051] Preparation of end cover and sprocket cover:

[0052] Prepare the end cover 14 and the sprocket cover 7, and evenly distribute the end cover screws 8 on the outer circular part of the end cover 14 and the sprocket cover 7.

[0053] Thread the steel ring 9 on each end cover screw 8 to ensure that the two ends of the steel ring 9 are tightly matched with the end cover 14 and the sprocket cover 7 respectively.

[0054] Install the magnetic steel 10:

[0055] Install the magnetic steel 10 on the inner wall ring surface of the steel ring 9 to form the magnetic field assembly of the motor.

[0056] Installation of center shaft 17:

[0057] Pass the center shaft 17 through the center hole of the end cover 14 and the sprocket cover 7, and sleeve the connecting disc 2 near the end of the sprocket cover 7.

[0058] Fix the connecting disc 2 and the sprocket cover 7 by connecting disc screw 3.

[0059] Install the sprocket 4:

[0060] Install the sprocket 4 at the distal end of the connecting disc 2, thread the sprocket 4 and the connecting disc 2 with the lock plate screw 6, and install the sprocket lock plate 5 to ensure locking, the sprocket 4 is any one of chain transmission or belt rotation.

[0061] Installation of bearing and oil seal:

[0062] The bearing 15 is embedded in the end cover 14, and the oil seal 16 is installed outside the bearing 15, so as to ensure the rotation stability and sealing of the central shaft 17.

[0063] Assembly of the electromagnetic part:

[0064] The core support 13 is installed in the cavity formed in the central shaft 17, and the core 11 is sleeved on the outer circumferential surface of the core support 13.

[0065] The winding 12 is embedded in the core 11, and the wire harness 18 is connected with the winding 12, and the wire harness 18 extends through the central shaft 17 to the outside of the end cover 14.

[0066] Final assembly:

[0067] The end cover 14 is connected with the sprocket cover 7 through the central shaft 17, so as to ensure that all parts are tightly matched, and the fasteners such as the screw 8, the screw 3 and the screw 6 are firmly screwed.

[0068] Principle of operation process:

[0069] When the motor needs to be started, the wire harness 18 is connected to the external adaptive power supply, the current passes into the winding 12, and the winding 12 generates electromagnetic force in the electromagnetic environment formed by the core 11 according to the principle of electromagnetic induction. The electromagnetic force drives the core support 13 to rotate around the shaft 17, and since the core support 13 is tightly matched with the shaft 17, the shaft 17 is also driven to rotate, thereby generating initial power.

[0070] With the rotation of the shaft 17, the coupling disc 2 connected with the shaft 17 stably through the coupling disc screw 3 rotates synchronously, and since the coupling disc 2 is rigidly connected with the sprocket cover 7, the sprocket cover 7 also starts to rotate; the sprocket 4 sleeved on the coupling disc 2 makes circular motion under the fastening action of the locking piece screw 6 and the sprocket locking piece 5. The sprocket 4 can transmit the rotary power to the external transmission mechanism through the adaptive chain or belt, so as to drive the corresponding equipment to operate, for example, to drive the wheels to realize the driving of the vehicle.

[0071] During the operation of the motor, the end cover 14 and the sprocket cover 7 are maintained in a tightly and stably connected relationship through the end cover screw 8 and the steel ring 9, so as to ensure the stability of the overall structure of the motor; the oil seal 16 effectively blocks the impurities such as dust and water from the outside from entering the inside of the motor, so as to avoid the erosion or damage of the key components such as the bearing 15 and the winding 12, and to ensure the long-term stable operation of the motor.

[0072] The above only describes the preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A mid-drive motor, comprising a motor (1), characterized in that, The motor (1) includes an end cover (14) and a sprocket cover (7). Multiple end cover screws (8) are equally spaced on the outer circumference of both the end cover (14) and the sprocket cover (7). The ends of the end cover screws (8) are threadedly connected to the same steel ring (9). Both ends of the steel ring (9) are sealed against the ends of the end cover (14) and the sprocket cover (7). A magnet (10) is provided on the inner circumferential surface of the steel ring (9). The same shaft (17) is inserted at the center of the end cover (14) and the sprocket cover (7). A connecting disc (2) is fitted onto the end of the shaft (17) closest to the sprocket cover (7). The connecting disc (2) is threadedly connected to the sprocket cover (7) by a connecting disc screw (3). A sprocket (4) is fitted onto the end of the connecting disc (2) furthest from the sprocket cover (7). The sprocket (4) can be either a chain drive or a belt drive. The sprocket (4) is connected to the connecting disc (2). A threaded connection is formed by a locking screw (6). A locking plate (5) is provided between the locking screw (6) and the sprocket (4). The sprocket locking plate (5) is coaxially sleeved on the outer circumferential surface of the shaft (17). A bearing (15) is embedded in the center of the inner wall of the end cover (14). The bearing (15) is coaxially sleeved on the outer circumferential surface of the shaft (17). An oil seal (16) is embedded in the center of the outer wall of the end cover (14). The shaft (17) is located on the end cover (14). A core support (13) is fitted on the outer periphery of the cavity formed inside the sprocket cover (7). A core (11) is fitted on the outer periphery of the core support (13). A winding (12) is embedded inside the core (11). A wire harness (18) is connected to the winding (12). The wire harness (18) passes through the shaft (17) and extends to the outside of the end cover (14). The oil seal (16) is coaxially fitted on the outer periphery of the shaft (17).

2. A mid-drive motor according to claim 1, characterized in that, The number of connecting disc screws (3) is six.

3. A mid-drive motor according to claim 1, characterized in that, The number of locking screws (6) is three.

4. A mid-drive motor according to claim 1, characterized in that, The number of end cap screws (8) is eight on each side.

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