KR102391199B1 - Double Differential Gear - Google Patents

Abstract

The present invention is a power transmission capable of moving and rotating in a narrow space and capable of generating a high torque by a high reduction gear ratio, comprising: a driving motor for generating driving force; and a driving motor gear connected to an output shaft of the driving motor. and a power transmission shaft gear connected to the driving motor gear to transmit power. and a power transmission shaft connected to the power transmission shaft gear. and a pair of differential input gears connected to both ends of the power transmission shaft. and a differential transmission gear 1 and a differential transmission gear 2 respectively provided on the left and right sides to transmit power from the pair of differential input gears to a pair of differential output gears provided on the left and right sides, respectively. and a differential case gear that rotatably supports the differential transmission gear 1 and the differential transmission gear 2 on the inside, and is provided on the left and right sides respectively having the gears on the outside; and a pair of direction change transmission gears meshing with the differential case gear provided on the left and right sides, respectively, and transmitting the driving force of the direction change motor; and a pair of direction conversion output shafts connected to the pair of direction conversion output gears. and a pair of direction conversion output gears connected to the other end of the pair of direction conversion output shafts. and a direction change input gear for transmitting the driving force of the pair of direction change motors.
It is effective to provide a power transmission device having excellent straightness and a narrow turning radius by the above configuration.

Description

Double Differential Gear

The present invention relates to a power transmission device using a dual differential gear that can be used for an electric wagon or the like. More particularly, it relates to a power transmission device applicable to an electric wagon having a small turning radius.

Prior art prior to the present invention is a technology applicable to a power transmission device of a vehicle and relates to a dual differential gear device using two gear units. Each gear unit is configured to include a first gear, a third gear, and a plurality of second gears disposed between and meshing with the first gear and the third gear, and a carrier connecting the second gears to each other, , any one gear or carrier of the first gear unit and the carrier of the second gear unit are connected to each other. The two shafts extending from the other unconnected gears or carrier of the first gear unit and the two shafts extending from the other unconnected gears of the second gear unit all rotate about the same axis center, so that 2 out of the 4 axes A technique is disclosed in which two axes are mechanically symmetrical, and may be used as an output axis and the other two axes may be used as input axes.

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Another prior art relates to a mechanical differential actuator for interacting with a mechanical load. The mechanical differential actuator comprises a first semi-active sub-actuator and a second semi-active sub-actuator, a velocity source and three interacting ports, respectively.

The branch has first and second mechanical differentials, the first mechanical differential having a first cooperating port coupled to the velocity source, a second cooperating port and a third cooperating port coupled to the first semi-active sub-actuator and an action port, wherein the second mechanical differential includes a first cooperating port coupled to the velocity source, a second cooperating port and a third cooperating port coupled to the second semi-active sub-actuator. Finally, a configuration is disclosed wherein the first mechanical differential and the second cooperating ports of the first mechanical differential couple together to form an output configured to couple to a load.

Registered Patent Publication No. 10-1188854 Registered Patent Publication 10-1477846

An object of the present invention is to provide a power transmission means capable of moving and rotating in a narrow space and capable of generating a high torque by a high reduction gear ratio.

Conventionally used means of transport and movement using motors are provided with respective motors and reduction gears on the left and right, and control them to move the transport and movement means.

However, this method has a disadvantage in that the structure is complicated because motors of the same capacity must be provided on each output shaft. In addition, since the motors provided on the left side are driven, the straightness can be maintained only when the rotation speed control or the speed control of the motor is accurately performed. If there is even a slight difference in the number of rotations of the left and right motors, it is not possible to go straight and it is a problem because it is tilted to one side.

The present invention provides the following problem solving means in order to solve the above problems.
a driving motor 110 for generating driving force; and
a driving motor gear 111 connected to an output shaft of the driving motor; and
a power transmission shaft gear 112 connected to the driving motor gear 111 to transmit power; and
a power transmission shaft 113 connected to the power transmission shaft gear 112; and
a pair of differential input gears 114 respectively connected to both ends of the power transmission shaft 113; and
In order to transmit the power of the pair of differential input gears 114 to the differential output gears 116 provided on the left and right sides, respectively, the differential transmission gear 1 115 and the differential transmission gear provided on the left and right sides, respectively. 2(117); and
a differential case gear 118 that rotatably supports the differential transmission gear 1 (115) and the differential transmission gear 2 (117) on the inside, and is provided on the left and right sides of which gears are provided on the outside; and
a pair of direction change output gears 212 that mesh with the differential case gear 118 provided on the left and right sides, respectively, and transmit the driving force of the direction change motor 210); and
a pair of direction conversion output shafts 213 connected to the pair of direction conversion transmission gears 212; and
a pair of direction conversion output gears 214 connected to the other end of the pair of direction conversion output shafts 213; and
Transmitting the driving force of the pair of direction switching output gears to the differential case gear 118,
The power transmission shaft 113, the differential axial force shaft, and the pair of direction switching output shafts 213 have power transmission shaft rotation support parts 310 and 330, differential output shaft rotation support parts 320 and 340, and direction shift shaft rotation support part ( 350, 360) is provided,

The power transmission shaft rotation support part, the differential output shaft rotation support part and the direction change shaft rotation support part are further provided with encoders to detect the rotation of each of the power transmission shaft, the differential axial force shaft, and the direction change output shaft. to provide.

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In addition, in the power transmission method using the dual differential gear,

When the driving motor rotates and the direction change motor does not rotate,

The drive motor gear rotates by the rotation of the drive motor,

A power transmission shaft gear meshed with the drive motor gear rotates, a power transmission shaft connected to the power transmission shaft gear rotates, a differential input gear connected to both ends of the power transmission shaft rotates, and a differential transmission gear connected to the differential input gear Power using a dual differential gear, characterized in that 1 and the differential transmission gear 2 rotate, the differential output gear connected to the differential transmission gear 1 and the differential transmission gear 2 rotates, and the output reduction gear meshed with the differential output gear rotates delivery method is provided.

In addition, in the power transmission method using the dual differential gear,

When the driving motor does not rotate and the direction change motor rotates,

The direction change input gear connected to the direction change motor rotates,

The direction change input gear and a pair of direction change transmission gears each meshed from left and right rotate in opposite directions, and a pair of direction change output shafts connected to the pair of direction change transmission gears rotate in opposite directions, and the one A pair of direction conversion output gears provided at the ends of the pair of direction conversion output shafts rotate in opposite directions,

A pair of differential case gears connected to the pair of direction switching output gears rotate in opposite directions, and the differential transmission gear 1 and the differential transmission gear 2 rotate around the stopped differential input gear by the rotational force, and the differential There is provided a power transmission method using a dual differential gear, characterized in that the differential output gear is rotated by the power of the transmission gear 1 and the differential transmission gear 2 .

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According to the present invention, by providing a power transmission device having excellent straightness and a narrow turning radius by the above configuration, a high weight load is loaded in a small space where a forklift cannot move in a rural area, a construction complex, an industrial complex, a distribution center, etc. And it is an invention having the effect of being transportable.

1 is a cart to which the dual differential gear of the present invention is applied;
2 is a conceptual diagram of a dual differential gear of the present invention;
3 is a connection diagram of a dual differential gear of the present invention;
4 is an exploded perspective view of a dual differential gear of the present invention;
5 is a detailed configuration view of the differential case gear and differential transmission gears 1 and 2 of the present invention;
6 is a gear operation diagram when going straight according to the present invention;
7 is a gear operation view during rotation of the present invention;
8 is a configuration diagram of a differential gear equipped with a clutch according to another embodiment of the present invention;

By utilizing the dual differential gear of the present invention, it is possible to manufacture an electric cart that can be easily used in rural areas and factories. The biggest part of the problems of the existing electric carts was that it was difficult to drive on a rough road. In particular, paddy fields and fields are mostly made up of rough terrain, and driving conditions are poor in rural areas because the road is still unpaved. In addition, the existing electric cart cannot rotate in place, so a large turning radius is required for rotation. On the paddy road, it is often necessary to move on a narrow road, and the smaller the turning radius, the easier it is to move the curved road, so an electric cart with a small turning radius is required.

A consideration when designing an electric cart using the dual differential of the present invention was to generate sufficient driving force of the motor at a constant speed while the cart endures the weight of the load.

Since the electric cart using the dual differential of the present invention will be used in farms and factories, it has to be considered that it has to go on a rough road, and it was designed to narrow the turning radius of the cart in order to be able to go on a narrow and curved road.

A characteristic of the present invention is that existing commercial products use a worm gear for the power transmission device or have a structure that transmits power by single axis, so there is a disadvantage in that sufficient deceleration is not achieved, and a large capacity of the motor is used.

The present invention is designed so that sufficient power can be generated even with a small-sized motor by using a dual differential gear for power transmission.

The cart using the dual differential gear of the present invention was designed to withstand the weight of 125 kg and maintain a speed of 5 km/h with the power of a 200 W motor.

The cart design formula used in the present invention is as follows.

When the effect of the present invention is described with reference to the drawings, it is as follows. 1 is a photograph of a cart using a dual differential gear of the present invention. It can be seen that the gear parts are all arranged at the lower part and are implemented very simply.

2 is a conceptual diagram of a dual differential gear of the present invention. It can be seen that a direction changing motor for rotation is provided above and a driving motor is provided below it. 3 shows a connection diagram of a dual differential gear of the present invention. From this figure, straight forward and rotated can be explained. In the case of going straight, it can be seen that the power from the driving motor is transmitted through the differential gear provided on the left and right as the output shaft, thereby realizing it.

In the case of rotation, the rotational direction is reversed as the power from the direction-changing motor is connected to the left and right gears, and the rotation is transmitted to the differential case gear provided on the left and right. is forward rotation, and the other is reverse rotation, which makes rotation possible.

3 includes the configuration of the power transmission shaft rotation support part, the differential output shaft rotation support part, and the direction change shaft rotation support part. These rotation support parts are basically responsible for supporting the shaft so that the shaft can be rotated. In addition, some or all encoders for measuring the number of rotations of the shaft may be provided. Due to the characteristics of the differential gear, the rotation of the left and right driving wheels may not be symmetrical due to slip or difference in frictional force. In this case, by using the encoder signal as an input signal, the cart or cart that does not go straight can be controlled in the straight direction again. In addition. It goes without saying that the encoder signal may be used to control the rotation angle.

4 is an exploded perspective view of the dual differential gear of the present invention, wherein the differential gear does not have a case, and the function of the case is combined with the differential case gear. This is also one of the reasons why the power transmission unit of the present invention operates very simply. 5 is a detailed view showing the configuration of the differential case gear and differential transmission gears 1 and 2 of the present invention.

6 is a gear operation diagram at the time of going straight according to the present invention.

7 is a gear operation diagram during rotation of the present invention, showing a configuration in which the direction is changed in a state in which the driving motor is stopped. Although the drawings show that the driving motor is driven in a stationary state for explanation, when the direction is slightly changed during movement instead of rotating in place, the above-mentioned one by rotating the direction changing motor forward or reverse while the driving motor is driven. The direction can be changed by changing the relative rotation of the differential case gear provided in the pair of differential gears.

The above invention is a configuration for transmitting power using a double differential gear, and the direction changing motor is used only for direction change and does not contribute to an increase in driving force.

Fig. 8 is to solve this problem, and in addition to the direction change, it was attempted to add a configuration that can be used to increase the driving force of the direction change motor.

As described above, when the rotational force from the direction switching motor rotates the shaft provided on the left and right through the direction switching input gear, the direction is changed by a difference in the rotation direction, so that there is no difference in the rotation direction. By further providing the rotational direction, it was possible to convert the rotational force into a driving force.

To this end, the power transmission configuration can be changed as shown in FIG. 8 by further providing a clutch and a left and right moving shaft. That is, a clutch configuration for connecting and disconnecting the direction change output gear provided on the left and right is further provided to provide a means for using both the drive motor and the direction change motor to generate a driving force.

100: double differential gear
110: drive motor
111: drive motor gear
112: power transmission shaft gear
113: power transmission shaft
114: differential input gear
115: differential transmission gear 1
116: differential output gear
117: differential transmission gear 2
118: differential case gear
119: differential output shaft gear
120: output reduction gear
210: direction change motor
211: direction change input gear
212: direction change transmission gear
213: direction change output shaft
214: direction change output gear
212': Left-right movable direction switching output gear
213': Left and right movable direction switching output shaft
214': Left-right movable direction change shaft gear
250: direction change output shaft clutch gear
260: direction change output gear with clutch
310, 330: power transmission shaft rotation support
320, 340: differential output shaft rotation support
350, 360: direction change shaft rotation support part

Claims (11)

a driving motor 110 for generating driving force; and
a driving motor gear 111 connected to an output shaft of the driving motor; and
a power transmission shaft gear 112 connected to the driving motor gear 111 to transmit power; and
a power transmission shaft 113 connected to the power transmission shaft gear 112; and
a pair of differential input gears 114 respectively connected to both ends of the power transmission shaft 113; and
In order to transmit the power of the pair of differential input gears 114 to the differential output gears 116 provided on the left and right sides, respectively, the differential transmission gear 1 115 and the differential transmission gear provided on the left and right sides, respectively. 2(117); and
a differential case gear 118 that rotatably supports the differential transmission gear 1 (115) and the differential transmission gear 2 (117) on the inside, and is provided on the left and right sides of which gears are provided on the outside; and
a pair of direction change output gears 212 that mesh with the differential case gear 118 provided on the left and right sides, respectively, and transmit the driving force of the direction change motor 210); and
a pair of direction conversion output shafts 213 connected to the pair of direction conversion transmission gears 212; and
a pair of direction conversion output gears 214 connected to the other end of the pair of direction conversion output shafts 213; and
Transmitting the driving force of the pair of direction switching output gears to the differential case gear 118,
The power transmission shaft 113, the differential axial force shaft, and the pair of direction switching output shafts 213 have power transmission shaft rotation support parts 310 and 330, differential output shaft rotation support parts 320 and 340, and direction shift shaft rotation support part ( 350, 360) is provided,
The power transmission shaft rotation support part, the differential output shaft rotation support part and the direction change shaft rotation support part are further provided with encoders to sense the rotation of each of the power transmission shaft, the differential axial force shaft, and the direction change output shaft.
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