CN2595603Y - Electric Vehicle Powertrain - Google Patents

Abstract

The utility model provides an electric motor car power transmission system of setting between electric motor car drive wheel, include: the inner rotor brushless DC motor with low rotating speed and high torsion consists of a motor front cover, an inner rotor, an outer stator and a motor rear cover, and the differential transmission mechanism consists of a differential bevel gear group, a differential mechanism front cover, a differential mechanism rear cover, a pair of transmission shafts and other members; the inner rotor is sleeved outside the differential transmission mechanism, the differential transmission mechanism and the inner rotor are locked, the outer stator is sleeved outside the inner rotor, and bearings of the differential transmission mechanism are respectively embedded into bearing seats on the inner side surfaces of the front motor cover and the rear motor cover to complete a power transmission system; by the arrangement, the power transmission system can run at a low rotating speed and a high torque force without reducing speed through a gear and synchronously driving the driving wheel of the electric vehicle, so that the electric vehicle can run quietly and efficiently, and has the advantages and effects of simple structure, attractive appearance, capability of effectively simplifying the maintenance process and the like.

Description

Electric Vehicle Powertrain

technical field

The utility model relates to a power system of a motor vehicle, in particular to a power transmission system of an electric vehicle.

technical background

Generally, the structure of a three-wheel or four-wheel electric vehicle is mainly composed of a frame, a power system, a transmission system, an electronic control system, and a power supply battery; and the most widely used power transmission system can be configured according to its structure and configuration. They can be divided into two types according to the different ways. Among them, the transmission system A of the first type (as shown in Figure 1) is composed of a motor 10 running at high speed and low torque to drive a reduction gear box 20, so that the motor 10 drives the reduction gear and reduces the speed. Slow down to an appropriate speed and then drive the rear wheels. This type of transmission system A usually needs to add a differential mechanism (not shown in the drawing) in the reduction gear box 20 for the convenience of steering; the other type is the hub motor transmission system B (such as Shown in Fig. 2), it mainly installs a hub motor 40 with low speed and high torque at the center of each rear wheel 30, and utilizes an electronic control system to control the speed of the hub motor 40 to achieve direct drive and steering Function. About the aforementioned two kinds of transmission systems, the shortcomings derived from structural differences and poor design are described in detail below.

The first type of power transmission system A is driven by a high-speed low-torque motor 10, as shown in Figure 1, because it needs to cooperate with a reduction gear box 20 to meet the speed and torque requirements of the electric vehicle, so in addition to the transmission due to the mutual meshing of the reduction gears In addition to the disadvantages such as noise and reduced transmission efficiency, there will also be problems and troubles in the maintenance and repair of the reduction gearbox. At the same time, the overall appearance of the entire transmission system A will be extremely poor due to the installation of too many components on the frame. It is complicated and will make the appearance of electric vehicles difficult to beautify. The transmission mechanism of the No. 397023 patent case of the known new patent announcement is the transmission system of this class.

Another type is the transmission system B directly driven by the hub motor 40. As shown in FIG. , the electronic control system will become extremely complex, and the design difficulty and manufacturing cost of the electronic control system will also increase relatively.

In view of this, the inventor of the present invention proposes an improved utility model aiming at the deficiency of the above-mentioned conventional electric vehicle transmission system, so as to solve the above-mentioned various problems.

Contents of the invention

The purpose of this utility model is to provide a power transmission system for an electric vehicle, especially a motor power transmission system that can be applied to a three-wheeled or four-wheeled electric vehicle or a compound power electric vehicle or a power-assisted electric vehicle. It has the advantages and effects of simple structure, beautiful appearance and can effectively simplify the maintenance process.

The purpose of this utility model is achieved in that:

A power transmission system of an electric vehicle is provided, which is arranged between two driving wheels of the electric vehicle, and is characterized in that the power transmission system includes:

A low-speed, high-torque inner-rotor brushless DC motor is composed of a motor front cover, an inner rotor, an outer stator and a motor back cover;

A differential transmission mechanism is composed of a differential bevel gear set, a differential front cover, a differential rear cover, a pair of transmission shafts and a pair of bearings;

The structural relationship of the above settings is: the pair of drive shafts are respectively connected to the two ends of the differential bevel gear set, and the differential bevel gear set is accommodated in the inner space formed by the front cover of the differential and the rear cover of the differential. The front cover of the differential and the back cover of the differential are respectively sleeved with bearings, thereby forming a differential transmission mechanism; the inner rotor is sleeved outside the differential transmission mechanism, and the differential transmission mechanism and the inner rotor are locked by screws. The outer stator is sleeved outside the inner rotor, and the bearings of the differential transmission mechanism are respectively embedded in the bearing seats on the inner side of the motor front cover and the motor rear cover, thereby forming a power transmission system; the pair of transmission shaft ends of the power transmission system Connect and drive the driving wheels of the electric vehicle separately; through this, the power transmission system can run at low speed and high torque and synchronously drive the driving wheels of the electric vehicle, so that the electric vehicle can move smoothly.

The differential front cover of the differential transmission mechanism can extend a sleeve protruding from the front cover of the motor, and a one-way transmission element such as a sprocket, a timing pulley or a bevel gear is locked outside the sleeve, and through the chain , Timing belt or bevel gear and other power transmission components are connected to other power sources on the power-assisted electric vehicle and transmitted to the power transmission system, which are respectively connected and driven by the drive shaft to drive the driving wheels of the electric vehicle to form a power-assisted type. Or a hybrid power-assisted electric vehicle.

The outer end of the transmission shaft is locked with a wheel body drive block, and the low-speed high-torque inner rotor brushless DC motor with a differential transmission mechanism and the wheel body drive block are built into the wheel body together. The wheel body drive block and the wheel body drive block The driving wheels of the electric vehicle are interlocked and the power of the low-speed high-torque inner rotor brushless DC motor drives the driving wheels of the electric vehicle through the wheel drive block.

Advantage and positive effect of the present utility model are:

Because the utility model adopts the above technical scheme, that is, a single-group power transmission system composed of a low-speed, high-torque inner rotor brushless DC motor and a differential transmission mechanism is used to replace the conventional power transmission device, which not only avoids the reduction gears due to mutual meshing The noise generated by the transmission greatly improves the transmission efficiency, and at the same time eliminates the maintenance and repair problems of the reduction gearbox, making the appearance of the entire transmission system more concise, and relatively improving the overall appearance of the electric vehicle.

Description of drawings

Fig. 1 is a schematic diagram of a conventional first power transmission device;

Fig. 2 is a schematic diagram of a conventional second power transmission device;

Fig. 3 is a schematic diagram of the three-dimensional appearance of the first embodiment of the utility model;

Fig. 4 is an exploded schematic view of the torque inner rotor brushless DC motor of the utility model;

Fig. 5 is an exploded schematic view of the differential transmission mechanism of the utility model;

Fig. 6 is a schematic top view of the first embodiment of the utility model;

C--C sectional view of Fig. 7 Fig. 6;

The partially enlarged schematic diagram of Fig. 8 and Fig. 7;

Fig. 9 is a schematic diagram of the use state of the second embodiment of the utility model;

Fig. 10 is a schematic top view of the second embodiment of the utility model;

D--D sectional view of Fig. 11 Fig. 10;

Figure 12 is a partially enlarged schematic diagram of Figure 11;

Fig. 13 is an exploded schematic view of the third embodiment of the utility model;

Further exploded schematic diagram of Fig. 14 Fig. 13;

Fig. 15 is a schematic cross-sectional view of the use state of the third embodiment of the utility model;

Fig. 16 is a partially enlarged schematic diagram of Fig. 15 . Description of part number in the figure:

A Power Transmission System B Transmission System 10 Motor

20 reduction gearbox 30 rear wheel 40 hub motor

1 Power transmission system 11 Low speed high torque inner rotor brushless DC motor

111 Motor front cover 1111 Bearing seat 112 Inner rotor

113 Outer stator 114 Motor rear cover 1141 Bearing seat

12 Differential transmission mechanism 121 Differential bevel gear 122 Differential front cover

1221 Sleeve 123 Differential rear cover 124 Transmission shaft

1241 drive shaft 125 bearing 126 one-way transmission element

13 bushing 131 axle base 14 wheel drive block

15 Drum Brake Mechanism 151 Brake Pad 152 Brake Cable

2 electric vehicle 21 rear wheel 22 wheel body

221 inner side 3 power-assisted electric vehicle 31 chain

Detailed ways

With regard to the technical means adopted by the inventors to achieve the above objectives, three preferred embodiments are given below in detail with reference to the drawings.

Embodiment one:

First please refer to shown in Figure 3, the power transmission system 1 of the present utility model is arranged between a pair of rear wheels 21 of the electric vehicle 2 (the present embodiment is an example of a rear-wheel drive type electric vehicle), the power transmission system 1 (as shown in Figure 4) is composed of a low-speed high-torque inner rotor brushless DC motor 11 and a differential transmission mechanism 12 two parts: wherein:

The low speed high torque inner rotor brushless DC motor 11 includes a motor front cover 111, an inner rotor 112, an outer stator 113 and a motor rear cover 114;

The differential transmission mechanism 12 (as shown in FIG. 5 ) includes a differential bevel gear set 121 , a differential front cover 122 , a differential rear cover 123 , a transmission shaft 124 , a transmission shaft 1241 and a pair of bearings 125 .

As shown in Figure 6, Figure 7 and Figure 8, the assembly method of the power transmission system of the present utility model is that the pair of drive shafts 124 and 1241 are respectively connected to the two ends of the differential bevel gear set 121, and the differential bevel gear The group 121 is accommodated in the internal space formed by the differential front cover 122 and the differential rear cover 123, and the differential front cover 122 and the differential rear cover 123 are respectively fitted with bearings 125 to form a complete differential gear. The transmission mechanism 12; after that, the inner rotor 112 is set outside the differential transmission mechanism 12, and then the differential transmission mechanism 12 and the inner rotor 112 body are locked with screws, and then the outer stator 113 is set outside the inner rotor 112 , so that the bearings 125 on both sides of the differential transmission mechanism 12 are respectively embedded in the bearing seats 1111 and 1141 of the motor front cover 111 and the motor rear cover 114 facing the differential transmission mechanism 12, and the power transmission system as shown in FIG. 8 is completed. 1. The state installed on the electric vehicle 2 is then shown in Figures 3 and 6. A hollow sleeve 13 is respectively sleeved outside the transmission shaft 124 and the transmission shaft 1241 of the power transmission system 1, so that the pair of transmission shafts 124, transmission The shaft 1241 is not exposed, and is locked on the axle base 131 so that the power transmission system 1 and the vehicle frame are fixed, and then the pair of transmission shafts 124 and the ends of the transmission shaft 1241 are connected to the rear wheels 21 of the electric vehicle 2 respectively.

With the above settings, when the electric vehicle 2 starts, the low-speed high-torque inner-rotor brushless DC motor 11 of the power transmission system 1 of the present utility model will generate high-torque and low-speed rotation, and its inner rotor 112 will directly Drive the differential transmission mechanism 12 inside it, so that the transmission shaft 124 and the transmission shaft 1241 synchronously drive the rear wheel 21, so that the electric vehicle 2 can move smoothly.

Embodiment two:

The above-described embodiment is the state that the utility model is applied to the electric vehicle 2, and for the power-assisted electric vehicle 3 (such as an electric vehicle with pedals attached) that does not fully utilize the motor as a power-assisted type or a compound power In other words (as shown in Figure 9), the utility model only needs to add a one-way transmission element 126 in the differential transmission mechanism 12, and it can be applied to the power-assisted electric vehicle 3 of the power-assisted or compound power; please refer to Figure 10 11 and 12, the differential front cover 122 of the differential transmission mechanism 12 is extended to a sleeve 1221 stretching out of the motor front cover 111, and a one-way transmission element 126 is sleeved outside the sleeve 1221 ( It can be a sprocket, timing pulley or bevel gear, etc. (in this embodiment, a one-way chain disc is taken as an example), so that the one-way transmission element 126 is locked on the sleeve 1221 extended from the differential front cover 122 Therefore, through the transmission of the chain 31 (as shown in Figure 9), the power of other power sources on the power-assisted electric vehicle 3 of the power-assisted type or compound power is transmitted to the power transmission system 1, and through the transmission Axle 124, drive shaft 1241 drive two rear wheels 21 respectively, and this is the second embodiment of the present utility model.

Embodiment three:

The following is the third embodiment of the utility model. From the previous description, we can see that the overall appearance of the utility model is in the form of a cylinder, so it can also be directly hidden in the wheel body 22. Please refer to FIG. 13 and FIG. 14 , which is mainly to lock the wheel body driving block 14 at the outer end of the drive shaft 124 of the power transmission system 1, and then drive the low-speed high-torque inner rotor brushless DC motor 11 containing the differential transmission mechanism 12 and the wheel body. The block 14 is plugged in the wheel body 22 together, and the drum brake mechanism 15 can be placed in the low-speed high-torque inner rotor brushless DC motor 11 shell and plugged in the wheel body 22 together. When the brake steel is pulled When the cable 152, the brake in the drum brake mechanism 15 can be used to cause friction between the sheet 151 and the inner surface 221 of the wheel body 22, and the effect of braking occurs. As shown in Figures 15 and 16, the wheel drive block 14 is used to drive the wheel body 22, and drive the other wheel body through the transmission shaft 1241. In this way, not only can the space occupied by the power system and transmission system of the conventional electric vehicle be saved, but also the overall appearance of the electric vehicle can be made more concise and the appearance of the electric vehicle can be increased. Aesthetic appearance.

From the above description, it can be seen that the utility model replaces the conventional power transmission device with the single-group power transmission system 1 composed of a low-speed, high-torque inner-rotor brushless DC motor 11 and a differential transmission mechanism 12, which not only avoids the reduction gear 20 Due to the noise generated by the meshing transmission, the transmission efficiency is greatly improved, and the maintenance and repair of the reduction gear box 20 are eliminated, the appearance of the entire transmission system is simpler, and the overall appearance of the electric vehicle is relatively improved.

In summary, the technical means disclosed in the "electric vehicle power transmission system" of the utility model can effectively solve the problems of the conventional power transmission system, and achieve the expected purpose and effect, and have not been published in publications before the application The fact that it has not been used publicly and has enhanced efficacy at the same time has both novelty and practicability, and it is a new type called in the Patent Law. It is correct and an application should be filed according to law.

Claims (3)

1. An electric vehicle power transmission system, which is arranged between two drive wheels of the electric vehicle, is characterized in that the power transmission system includes: A low-speed, high-torque inner-rotor brushless DC motor is composed of a motor front cover, an inner rotor, an outer stator and a motor back cover; A differential transmission mechanism is composed of a differential bevel gear set, a differential front cover, a differential rear cover, a pair of transmission shafts and a pair of bearings; The structural relationship of the above settings is: the pair of drive shafts are respectively connected to the two ends of the differential bevel gear set, and the differential bevel gear set is accommodated in the inner space formed by the front cover of the differential and the rear cover of the differential. The front cover of the differential and the back cover of the differential are respectively sleeved with bearings, thereby forming a differential transmission mechanism; the inner rotor is sleeved outside the differential transmission mechanism, and the differential transmission mechanism and the inner rotor are locked by screws. The outer stator is sleeved outside the inner rotor, and the bearings of the differential transmission mechanism are respectively embedded in the bearing seats on the inner side of the motor front cover and the motor rear cover, thereby forming a power transmission system; the pair of transmission shaft ends of the power transmission system Connect and drive the driving wheels of the electric vehicle respectively. 2. The electric vehicle power transmission system according to claim 1, characterized in that the differential front cover of the differential transmission mechanism is a sleeve that can extend out of the front cover of the motor, and a sleeve is locked outside the sleeve. One-way transmission elements such as sprockets, timing belt pulleys or bevel gears, and through the transmission of power transmission elements such as chains, timing belts, or bevel gears, are connected to other power sources on the power-assisted electric vehicle and transmitted to the power transmission system are respectively connected and driven to the driving wheels of the electric vehicle through the transmission shaft to form a power-assisted or compound power-assisted electric vehicle. 3. The power transmission system of an electric vehicle according to claim 1, characterized in that a wheel body drive block is locked at the outer end of the transmission shaft, and a low-speed high-torque inner-rotor brushless DC motor with a differential transmission mechanism is included. The wheel body driving block and the wheel body driving block are built into the wheel body together. The wheel body driving block and the driving wheel of the electric vehicle are locked to each other and the power of the low-speed high-torque inner rotor brushless DC motor drives the electric vehicle through the wheel body driving block. The drive wheel of the car.

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