KR20010035552A - Dynamics Wheel - Google Patents

Abstract

PURPOSE: A power wheel is an integral combination of an electromotor and a wheel, which is light-weighted and highly efficient. CONSTITUTION: A power wheel comprises an embedded type permanent-magnet synchrony-motor(3), a reducer(7) and a vehicle control part. The motor(3) is controlled by a wheel control unit and receives electricity from a battery to generate driving force. The reducer(7) decelerates the output power of the motor(3) to an appropriate level and transmits the power to a car wheel(5) connected therewith. The vehicle control part controls all the process based on order inputted by a driver. The motor(3) and the reducer(7) are integrally engaged with the wheel(5) with a single shaft sharing.

Description

Power Wheels {Dynamics Wheel}

The present invention relates to a power wheel, and more particularly, is integrally coaxially connected to a vehicle wheel such as an electric vehicle, so that power can be more efficiently transmitted by appropriately decelerating power generated directly to the wheel. To this end, the power generation and transmission device relates to a power wheel integrated into the vehicle wheel.

As the number of vehicles such as passenger cars and commercial vehicles increases rapidly around the world, the global atmosphere is rapidly polluted by the exhaust gases such as carbon dioxide, nitrogen oxides and volatile organic oxides emitted from automobiles, and global warming continues. Since the early 90's, interest in automobiles powered by electricity, such as electric vehicles, has been increasing.

An electric vehicle is composed of a propulsion unit for generating power and a vehicle body, in which the propulsion unit includes a battery for supplying power; An electric motor generating power by using the power supplied by the battery; And an electric motor control device suitable for controlling the electric motor and supplying the generated power to a necessary place.

Among them, the fields of interest of the researchers are the electric motor and the motor control device, and among them, researches for weight reduction or power density improvement for improving fuel efficiency of an electric vehicle, that is, to operate farther using limited battery energy The key is to increase the efficiency of the actuator itself, which makes up the propulsion unit, and to make the weight lighter.

On the other hand, the types of the propulsion unit, when classified according to the number of motors used, there are a centralized form using only one electric motor, and a distributed type using two or four electric motors, The main focus is on the centralized form, and there is a lack of research on the development of electric vehicles by multiple electric motors.

In the conventional electric vehicle, in order to transmit the generated power to each wheel, the gearbox is fixed to the output shaft of the motor once, and then the power decelerated at the proper speed by the speed reducer is distributed to the left and right wheels through the differential gear, respectively. By doing so, the output of the power shaft was transmitted to the wheels.

However, the conventional electric vehicle using only one engine and one electric motor as described above has a problem in that, in most cases, a DC motor or an induction motor is relatively low in terms of efficiency and output ratio.

In addition, since the power decelerated by the speed reducer after being generated in the electric motor is finally transmitted to the wheel only after passing through the differential gear, there is a problem in that the transmission efficiency is not good. That is, the conventional vehicle wheel is rotated indirectly received the output of another actuator, such as a driving force.

The present invention has been made to solve the above problems, while using the same battery energy, electric vehicles, golf cars, forklifts and the like having a similar structure, such as to operate the longest possible distance as possible The purpose is to provide ultra-light power wheels.

1 illustrates a schematic configuration of an electric vehicle to which a power wheel according to the present invention is applied;

FIG. 2 is an exploded perspective view showing an embodiment of a power wheel including the vehicle wheel 5, the speed reducer 7 and the embedded permanent magnet synchronous motor 3 shown in FIG. 1;

3 is an exploded perspective view of the embedded permanent magnet synchronous motor 3 of FIG.

4 is a perspective photograph showing the stator core of FIG. 3,

5 is a partial cutaway cross-sectional view showing a coupling state of FIG.

6 is an exploded perspective view of the reducer 7 shown in FIG.

FIG. 7 is a side view illustrating only the carrier body and the lids 73a and 73b shown in FIG. 6,

FIG. 8 is a perspective photograph showing a state in which the sun gear 71 and the planetary gear 72 of FIG. 6 are coupled to the inside of the carriers 73a and 73b of FIG.

9 is a photograph showing a state in which the coupling device of the overall configuration for the power generation and power transmission of the power wheel according to the invention coupled with the control unit of the general wheel.

※ Explanation of code for main part of drawing

1: wheel controller 2: storage battery

3: electric motor 5: vehicle wheel

7: reducer 9: vehicle control unit

31: stator iron core 32: winding coil

33: inner frame 34: permanent magnet

35: iron core 36: rotating shaft

37: outer frame 38: front cover

39: rear cover 71: sun gear

72: planetary gear 72a: planetary gear coupling

73a, 73b: carrier body and cover 74: internal spur gear

75: gear case 75a, 75b: wheel coupling

Power wheel according to the present invention for achieving the above object, in the device for transmitting the rotational power to the wheel of the vehicle, having a rotation drive shaft directly connected on the same axis as the rotation axis of the wheel, the rotation drive shaft Power generating means for driving to transfer the rotational power to the wheel; And it is characterized in that it is integrally coupled to the power generating means on the same axis, the deceleration means for reducing the rotational speed of the rotary drive shaft to a predetermined ratio and transmits to the wheel.

In the power wheel according to the present invention configured as described above, since the use of the embedded permanent magnet motor as the power generating means, the rotational driving force generated thereby is transmitted directly to the vehicle wheel only through the deceleration means without a separate intermediate rotation shaft High efficiency can be obtained.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a power wheel according to the present invention will be described in detail.

1 shows a schematic configuration of an electric vehicle to which a power wheel according to the present invention is applied, and under the control of the wheel control device 1, an embedding which generates a driving force by receiving power from the battery 2 is shown. Type permanent magnet synchronous motor (3); A reducer (7) which reduces the output of the electric motor (3) to an appropriate level and transmits the resultant to the wheels (5) of the vehicle body connected to one end thereof; And a vehicle control unit 9 which collectively controls the process based on an operation command input from the driver, wherein the electric motor 3 and the speed reducer 7 are as shown in the drawing. It is structured to be integrated with each other on the same axis as 5). The rating of the electric motor 3 is 47Nm, 22kW, 4000rpm, the maximum value of 120Nm, 60kW, 7500rpm was used, the reduction ratio of the reducer 7 is configured to be about 6: 1, the embedded permanent magnet synchronous motor (3) can be variously replaced, such as an induction motor, a synchronous motor, or a brushless motor.

FIG. 2 is an exploded perspective view showing an embodiment of a power wheel including the vehicle wheel 5, the speed reducer 7 and the embedded permanent magnet synchronous motor 3 shown in FIG. 1, and FIG. An exploded perspective view of the embedded permanent magnet synchronous motor 3 of a stator iron core 31 (see FIG. 4) having a plurality of slots formed radially along an inner circumferential side thereof; A winding coil 32 wound around the slot; An inner frame 33 to which the stator iron core 31 into which the winding coil 32 is wound is mounted; A rotor iron core 35 provided to be rotatable in an inner space of the stator iron core 31 and having four permanent magnets 34 embedded therein; A shaft 36 inserted into and fixed to the hollow part of the rotor iron core 35 to rotate integrally with the rotor iron core 34; An outer frame 37 provided outside the inner frame 33; And a front cover 38 and a rear cover 39 for sealing the front and rear surfaces of the outer frame 37, and FIG. 5 is a partially cutaway cross-sectional view of FIG. 3.

FIG. 6 is an exploded perspective view of the reduction gear 7 shown in FIG. 2, and a sun gear fixed to one end of the rotation shaft 36 of the electric motor 3 so as to be integrally rotatable with the rotation shaft 36. 71; A planetary gear 72 provided on the outer circumferential surface of the sun gear 71 so as to mesh with the sun gear 71 so as to interlock and rotate along the outer circumferential surface of the sun gear 71; The sun gear 71 and the planetary gear 72 is internally coupled, but coupled to the planetary gear 72 by the planetary gear coupling mechanism 72a to be integrally rotatable, generated by the electric motor (3) Main body and cover (73a, 73b) of the carrier to perform an intermediate intermediate role for reducing the rotational driving force to a predetermined speed and to transmit to the vehicle wheel (5); A spur gear 74 that provides an idle path during interlocking rotation of the planetary gear 72; And the components are inserted into the inside, one side is configured to include a gear case 75 formed with a plurality of wheel coupling portion (75a) for corresponding coupling with the inside of the vehicle wheel (5), Figure 7 FIG. 8 is a side view illustrating only the carrier body and the lids 73a and 73b, and FIG. 8 is a perspective view showing a state in which the sun gear 71 and the planetary gear 72 are coupled to the inside of the carriers 73a and 73b of FIG. 9 is a picture showing a state in which the entire component (that is, the coupling device of the overall configuration of Figures 3 and 6) for the power generation and power transmission of the power wheel according to the present invention is coupled with the control of the general wheel. It is a photograph.

Referring to the power transmission process of the power wheel according to the present invention configured as described above are as follows.

First, when the driver takes an action such as stepping on an accelerator pad or a brake pedal, the vehicle controller 9 detects this and corresponds to the motion detected by the wheel controller 1. And the wheel control apparatus 1 applies AC power to the stator winding 12 based on the applied signal, thereby generating a magnetic pole periodically changing to the stator core 31. do.

Between the magnetic poles generated in this way and the magnetic poles of the permanent magnets 34 embedded in the rotor iron core 35 provided in the stator iron core 31, the attraction force and the repulsive force alternately according to the change of the magnetic poles. By this force, the rotor iron core 35 rotates at a high speed, thereby obtaining a rotational driving force.

The rotational driving force of the rotor iron core 35 that rotates at high speed passes through the rotation shaft 36 integrally fitted therein, and through the carrier 19 coupled on the same axis as the end of the speed reducer 7. Is delivered).

The speed reducer 7 is designed to achieve an appropriate level of deceleration using the sun gear 71, the planetary gear 20, and the internal spur gear 74. It demonstrates with reference to FIG.

When the motor rotating shaft 35 starts to rotate at high speed, the sun gear 71 fixedly coupled to the rotating shaft 35 and integrally rotated also rotates at the same speed, and thus the teeth of the sun gear 71 The planetary gear 72 meshes with the rotation of the sun gear 71 and rotates along the inner circumferential surface of the spur gear 74 about the axis of the sun gear 71. (公 轉)

At this time, if the number of teeth of the sun gear 71 is formed to be smaller than the number of teeth of the internal spur gear 74, the deceleration is made as much as the number of teeth ratio (bias), the present invention is the above As described, more teeth of the internal spur gear 74 were formed so as to have a reduction ratio of about 6: 1, and thus, finally, the rotational force transmitted to the vehicle wheel 5 is the initial rotation of the electric motor 3. The speed is reduced to a certain degree relative to the speed is transmitted, so that a torque as large as the reduction ratio can be obtained.

Conventional general speed reducers using bevel gears have a disadvantage in that the efficiency is less than 90%, resulting in a large amount of energy lost and a complicated structure due to shifts in the power transmission shaft, but in the present invention, the planetary By using the gear 20, the efficiency could be increased up to about 98%, and the power transmission shaft could also be formed on the same axis, thereby achieving about 95% efficiency, and thus the power transmission efficiency up to the vehicle wheel 5. By maximizing the weight and efficiency can be achieved.

According to the power wheels provided with the power transmission device according to the present invention in the two vehicle wheels 5, the average speed of 60 km / h, the maximum speed 130 km / h for the total weight of the vehicle 1686 kg (including 400kg battery and 70kg driver) In the stationary state, the acceleration capacity up to 100km / h was about 21 seconds.

The power wheel according to the present invention can be applied not only to general electric vehicles, but also to various kinds of vehicles such as golf cars, forklifts, electric bicycles, electric motorcycles, electric wheelchairs, electric buses, electric trances, and toy cars. It is possible to do

Power wheel according to the present invention configured and operated as described above, the power generation and transmission device is integrated in the vehicle wheel to achieve a light weight and high efficiency, so that the vehicle can run the longest possible distance while using the same battery energy In addition, if the wheels of various specifications equipped with the power transmission device are manufactured in advance, the wheels suitable for the specifications of the vehicle to be used can be selected and mounted so that an electric car, a forklift truck, a golf car, etc. having desired driving performance can be more easily performed. I can produce it.

Claims (8)

Vehicle wheels; Power generation means integrally coupled to the wheel on the same axis as the rotation axis of the wheel to generate a rotational driving force of the wheel; And And a deceleration means for decelerating the rotational driving force generated by the power generating means at a predetermined ratio and transmitting the deceleration means to the wheel. The method of claim 1, The power generating means is a power wheel, characterized in that the permanent magnet motor embedded. The method of claim 1, The power generating means is a power wheel, characterized in that the induction motor The method of claim 1, The power generating means is a power wheel, characterized in that the brushless (motor) The method of claim 1, The deceleration means is a power wheel, characterized in that for deceleration using a planetary gear. An apparatus for transmitting rotational power to wheels of a vehicle, And a rotation drive shaft directly connected on the same axis as the rotation shaft of the wheel, the power generating means for driving the rotation drive shaft to transmit rotational power to the wheel. The method of claim 6, And a deceleration means coupled to the same shaft as the power generating means integrally and decelerating the rotational speed of the rotary drive shaft at a predetermined ratio and transmitting the deceleration means to the wheel. The method according to claim 6 or 7, The power generating means is a power transmission device of a power wheel, characterized in that the permanent magnet motor.