JP2001347844A - Electric cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve weight balance in the cross direction of a car body. SOLUTION: This is an electric cart 1 to transmit motive power of a motor 2 to a driveshaft 3 to drive a wheel through a decelerator A. The motor 2 which is a driving source and an electromagnetic brake 25 to apply braking on the motor 2 are separated from each other and they are arranged on both sides with a central line in the cross direction of the car body 11 of the electric cart 1 between them. A center of the decelerator A and the central line in the cross direction of the car body 11 are made to roughly match with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cart used by people with physical disabilities and the elderly.

[0002]

2. Description of the Related Art Conventionally, there is known an electric cart used by people with physical disabilities and the elderly. In this electric cart, the power of a motor as a drive source is transmitted to a drive shaft via a speed reducer including a gear and a differential gear, and the wheels are driven by rotating the drive shaft. Conventionally, an electromagnetic brake for applying braking to the motor has been incorporated in the motor case together with the motor. In addition, an encoder for detecting the number of revolutions of the motor was also incorporated in the motor case together with the motor.

[0003] An encoder is required in an electric cart for the following reasons. That is, the electric carts used by people with physical disabilities and the elderly as described above are regulated so that the maximum speed is 6 km / h or less for safety, and thus the maximum speed is 6 km / h or less. The electric cart does not have a transmission, and the speed is controlled by operating the accelerator lever to change the rotation of the motor. As described above, to control the speed of the electric cart, the rotation of the motor is detected by the encoder, and the control unit controls the maximum speed based on the number of rotations of the motor detected by the encoder, and changes the speed when the accelerator lever is operated. To do.

However, as described above, since the electromagnetic brake and the encoder are incorporated together with the motor in the motor case, the motor case becomes large,
When a large motor case is provided on the vehicle body of the electric cart, the motor case is disposed so as to straddle the center line in the width direction of the vehicle body. Therefore, to transmit power to the reduction gear from the motor shaft protruding from one side of the motor case,
Inevitably, the center of the speed reducer had to be shifted to one side from the center line in the width direction of the vehicle body. As described above, since the reduction gear, which is a heavy object, is disposed so as to be shifted to one side from the center line in the width direction of the center vehicle body, there is a problem that the weight balance in the width direction of the vehicle body is deteriorated.

Further, since the encoder is provided in the motor case, there is a problem that the sensor of the encoder may be damaged due to the heat of the motor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an improved weight balance in the width direction of a vehicle body. It is still another object of the present invention to provide an electric cart capable of increasing a motor output.

[0007]

According to the present invention, there is provided an electric cart for transmitting power of a motor to a drive shaft for driving wheels via a speed reducer. In the above, the motor 2 as a drive source and the electromagnetic brake 25 for applying braking to the motor 2 are separated and disposed on both sides of the center line L in the width direction of the vehicle body 11 of the electric cart 1, and the speed reducer A The center S and the center line L in the width direction of the vehicle body 11 are substantially matched with each other. With this configuration, the heavy motor 2 and the electromagnetic brake 25 are separated from each other and arranged on both sides of the center line in the width direction of the vehicle body 11 of the electric cart 1 to balance the width of the vehicle body 11 in the width direction. Then, the center S of the heavier reduction gear A and the center line L in the width direction of the vehicle body 11 are made substantially coincident with each other to balance in the width direction of the vehicle body 11. Motor 2 and electromagnetic brake 2
By separating the motor 5, the size of the motor 2 can be increased, and the output of the motor 2 can be increased.

Further, an encoder B for detecting the rotation speed of the motor 2 is separated from the motor 2 so that the electromagnetic brake 25
It is preferred to be attached to the side. With such a configuration, there is no possibility that the sensor of the encoder B will fail due to the heat of the motor 2.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 to 3, the electric cart 1 is provided with wheels on the front, rear, left and right sides of a vehicle body 11 (ie, the vehicle body 1).
1, a front wheel 20 is provided on the left and right of the front part, and a rear wheel 21 is provided on the left and right of the rear part of the vehicle body 11), a drive block 22 is mounted on the vehicle body 11, Is transmitted to the drive shaft 3 and the drive of the drive shaft 3 is transmitted to the rear wheels 21 so as to travel. The vehicle body 11 is provided with a seat surface 6 on which a driver sits, and a storage battery for supplying electric power to the motor 2 is mounted below the seat surface 6. A handle 23 is provided at a front part of the vehicle body 11, and the type of operation (speed, forward,
An operation panel (not shown) for operating the vehicle (reverse) is provided.

The driver sits on the seat surface 6 and drives the vehicle by holding the handle 23 by hand. When the accelerator 24 provided on the handle 23 is operated, the driving of the motor 2 is performed by the rear wheels 21 which are driving wheels. The electric cart 1 travels, and the speed, forward movement, reverse movement and the like are set by operating an operation panel, and the steering direction changes when the steering wheel 23 is rotated.

When the driver releases the accelerator 24, the power from the motor 2 is cut off, and a braking force is applied to the rear wheel 21 as a driving wheel by the electromagnetic brake 25, so that the electric cart 1 stops. .

The vehicle body 11 is provided with a lighting device such as a direction indicator 26 and a front irradiator 27, and is turned on by operating a switch provided on an operation panel. The vehicle body 11 is provided with a mechanical brake operation unit 28. By operating the mechanical brake operation unit 28, the wheels can be mechanically braked by the brake shoes. The vehicle body 11 is provided with a mirror 29 for rearward confirmation.

The drive block 22 mounted on the vehicle body 11 is as shown in FIGS. Motor case 2a
The motor 2 is installed inside, and the motor shaft 3 of the motor 2
0 protrudes from the side surface of the motor case 2a, and an electromagnetic brake 25 is connected to the motor shaft 30 protruding from the motor case 2a via a coupling 31. The electromagnetic brake 25 is stopped when the vehicle body 11 stops. Is made possible. As shown in FIG. 6, the electromagnetic brake 25 is housed in an auxiliary case D, and an encoder B is housed in the auxiliary case D together with the electromagnetic brake 25, and the rotational speed of the motor 2 is detected by the encoder B. It is supposed to. On the other hand, the rotation of the motor shaft 30 is transmitted to the drive shaft 3 via the speed reducer A, and the rear wheel 21 connected to the drive shaft 3 rotates by the drive shaft 3 being driven to rotate. The speed reducer A includes a first-stage drive gear 32 fixed to the motor shaft 30 and a first-stage driven gear 3 meshed with the first-stage drive gear 32 to transmit power.
3, a second-stage drive gear 37 meshing with the first-stage driven gear 33 and transmitting power, and a second-stage driven gear 41 meshing with the second-stage drive gear 37 and transmitting power. A differential gear (differential gear) 42 is fixed to the second-stage driven gear 41, and the drive is transmitted to the drive shaft 3 via the planetary gear 43 of the operating gear 42. It is configured as follows. The speed reducer A having the above structure is housed in a speed reducer case C.

As described above, the drive block 22 in the present invention is roughly divided into the motor case 2 in which the motor 2 is mounted.
a, an auxiliary case D containing an electromagnetic brake 25 and an encoder B, and a reducer case C containing a reducer A. The motor case 2a and the auxiliary case D are provided on both sides of the auxiliary case D. The motor case 2a and the auxiliary case D are connected to the auxiliary case D by bolts or the like, respectively, thereby forming one drive block 22 as shown in FIG.

The drive block 22 having the above structure is mounted on the vehicle body 11.
As shown in FIG. 4, a motor case 2a containing a motor 2 serving as a driving source, an auxiliary case D containing an electromagnetic brake 25 and an encoder B are mounted on the center of the electric cart 1 in the width direction. The speed reducer case C having the speed reducer A therein is disposed on both sides of the line L, and the center S of the speed reducer case C and the center line L in the width direction of the vehicle body 11 are substantially aligned. It is mounted by being connected to the vehicle body 11. Thereby, the weight balance in the width direction of the vehicle body 11 in the electric cart 1 is improved, and since the motor 2 and the encoder B are separated from each other, there is no possibility that the sensor of the encoder is broken down by the heat of the motor. By separating the motor 2 and the encoder B, the motor 2 can be lengthened and the output of the motor 2 can be increased.

[0017]

As described above, according to the first aspect of the present invention, there is provided an electric cart for transmitting the power of a motor to a drive shaft for driving wheels via a speed reducer.
The motor that is the drive source and the electromagnetic brake for applying braking to the motor are separated and placed on both sides of the widthwise centerline of the electric cart, and the center of the reduction gear and the widthwise centerline of the vehicle Approximately, the heavy motor and the electromagnetic brake are separated and placed on both sides of the widthwise centerline of the electric cart body to balance in the width direction of the car body. The center of the speed reducer and the center line of the vehicle body in the width direction can be made substantially coincident with each other to balance the vehicle body in the width direction and provide an electric cart that can run stably. By separating the brake, the motor can be made larger and the motor output can be increased.

According to the second aspect of the invention, in addition to the effects of the first aspect, an encoder for detecting the number of rotations of the motor is separated from the motor and attached to the electromagnetic brake side. Therefore, there is no possibility that the encoder sensor will be damaged by the heat of the motor, and the rotation of the motor can be detected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric cart according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a partially omitted cross-sectional view of the driving block according to the first embodiment.

FIG. 5 is a perspective view of a driving block according to the embodiment.

FIG. 6 is a partially broken plan view showing the electromagnetic brake and the encoder according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric cart 2 Motor 3 Drive shaft 11 Body 25 Electromagnetic brake A Reduction gear B Encoder L Center line S Center

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Claims (2)

[Claims] An electric cart for transmitting power of a motor to a drive shaft for driving wheels via a speed reducer,
The motor that is the drive source and the electromagnetic brake for applying braking to the motor are separated and placed on both sides of the widthwise centerline of the electric cart, and the center of the reduction gear and the widthwise centerline of the vehicle An electric cart characterized by substantially matching the above. 2. The electric cart according to claim 1, wherein an encoder for detecting the number of rotations of the motor is separated from the motor and attached to the electromagnetic brake side.