JPH04135591A - Steering device in automobile toy - Google Patents

Abstract

PURPOSE:To improve the accuracy of an operation, to miniaturize the constitution of the device, and to obtain a product having a long service life and durability by determining a steering angle by feeding back negatively an output of a non-contact type sensor used for a steering angle detecting means to a motor driving circuit. CONSTITUTION:In the case a direction conversion motor 2 is driven and a magnet holding member 6 moves to the right, that is, when front wheels 9 are steered in the left direction, a component which intersects vertically to a Hall element 12 is generated in a magnetic flux density vector B of a magnetic field 13. There-fore, the Hall element 12 generates a Hall voltage. In the same way, in the case the magnet holding member 6 moves to the left, a magnetic flux density vector component which intersects vertically to the lower part against the Hall element 12, and a voltage of an inverted code is generated. An output voltage of the Hall element 12 is subjected to negative feedback to a motor driving circuit, and a difference to an external input is taken. In such a way, an actual moving amount of a magnet 7 is detected as a steering angle of the front wheels, and the steering angle of a vehicle is determined correctly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a steering system for a toy car, and more specifically, a steering system for determining the direction of the front wheels to a desired steering angle using a non-contact sensor. It is related to the device.

[Conventional technology]

2. Description of the Related Art Some toy cars that can be controlled wirelessly or by wire are equipped with a drive wheel motor and a direction change motor, and can move forward, backward, and change direction by operating each motor independently.

Such a toy car, for example, has two joysticks for moving forward and backward, and for changing direction, as shown in FIG.
, c is used to perform the maneuver.

A receiver d is installed on the car body side, and a transmitter a
This pulse signal is input to the pulse width discrimination circuit e.

The pulse width discrimination circuit e converts the pulse signal into a voltage signal according to the pulse width, and inputs the voltage signal to the motor drive circuit f.

The direction changing motor g is rotatable in both forward and reverse directions, and is driven based on the output of the motor drive circuit f.

As shown in the exploded perspective view of FIG. 7, the front wheels j and j for performing direction change are rotatably supported by a rocking member k, and the vehicle body is attached to the rocking member. It is pivoted on the p side.

The rotation of the motor g is transmitted via a gear h to a rotary plate m that is pivotally supported on the side of the vehicle body p, and is also transmitted to a potentiometer i.

One end of n is attached to the rotating plate m, and the other end is attached to the swinging member k.
This is a rod attached to the rotary plate m, which pushes and pulls the swinging member k in accordance with the rotation of the rotary plate m.

The motor drive circuit f drives the motor g to achieve the desired steering angle operated by the transmitter a, and the rotary plate m rotates accordingly.

From this, the rods n, n push or pull the swinging members k, k in either direction to set the front wheels L j to a desired steering angle.

At this time, the potentiometer i detects the steering angle as the rotation angle of the rotary plate m, and feeds this back negative feedback to the motor drive circuit f to determine the amount of rotation of the motor g.

Problems to be solved by the invention C] In the above-mentioned device, there is a problem that power is directly transmitted to the potentiometer for detecting the steering angle, which causes loss and lacks precision in operation. .

In addition, since a potentiometer is used, it is difficult to miniaturize the overall device configuration, and it cannot be applied to ultra-small miniatures, and the lifespan is short if a small potentiometer is used. There was this inconvenience.

Furthermore, mechanical adjustment of potentiometers, rotary plates, rods, swinging members, etc. is essential, and there is also the problem that the work becomes complicated.

In view of the above-mentioned problems, the present invention provides a steering system for a toy car that reduces loss of motor power, enables accurate operation, miniaturizes the configuration of the device, and eliminates the need for mechanical adjustment. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a direction changing motor that rotates the front wheels of a vehicle in a steering direction to set a steering angle of the vehicle, and a motor that drives the direction changing motor based on an external input. In a toy car having a drive circuit and a steering angle detection means for detecting a steering angle of the vehicle, a non-contact type sensor is used for the steering angle detection means, and the output of the non-contact type sensor is applied to the motor drive circuit. This constitutes a steering device for a toy car, which is characterized in that the steering angle is corrected by feedback.

Here, the steering angle detection means rotatably supports each of the two front wheels of the vehicle, and includes two rocking members supported by the vehicle body and rotatable in the horizontal direction, and two swinging members whose ends are connected to the two front wheels.
a rod that is pivotally attached to one swinging member and swings the swinging member by moving left and right; a magnet that is attached to approximately the middle of the rod with both poles positioned in the left-right direction; and a magnet that corresponds to the magnet. a Hall element that is attached to the vehicle body;
The rod may be moved in the left-right direction by a direction conversion motor, and the displaced position of the rod may be detected as a steering angle.

Further, a worm gear attached to the rotating shaft of the direction conversion motor, a screw shaft rotatably supported by the vehicle body and having a gear meshing with the worm gear, and a screw hole screwed into the screw shaft are provided. and a magnet holding member that holds a magnet on the lower surface, the center portion of the rod is pivotally supported by the magnet holding member, and the magnet holding member is moved in the left and right direction in response to the drive of the direction change motor. It can be configured to move.

[Operation] The steering device for the toy car according to the present invention has the above-described configuration, and the motor drive circuit drives the direction changing motor based on external input to rotate the front wheels of the vehicle in the steering direction.

This steering amount is detected by a non-contact sensor of the steering angle detection means, and is negatively fed back to the motor drive circuit.

From this, the difference between the desired steering amount and the actual steering amount is determined, and this difference is eliminated.

〔Example〕

The details of the present invention will be explained based on illustrated embodiments.

FIGS. 1 and 2 are explanatory diagrams of an embodiment of a steering device for a toy car according to the present invention.

1 in the figure is a chassis that constitutes the vehicle body.

Reference numeral 2 denotes a direction changing motor that is attached to the chassis 1 and is used to set the steering angle of the front wheels of the vehicle.

This direction conversion motor 2 is driven by a motor drive circuit (not shown), and has a worm gear 3 attached to its rotating shaft.

A screw shaft 4 is attached to the chassis 1 and rotatably supported, and is provided with a gear 5 that meshes with the worm gear 3 of the direction conversion motor 2.

Reference numeral 6 denotes a magnet holding member that has a screw hole that engages with the screw shaft 4 and is guided by the rail 14 and can be moved left and right according to the rotation of the screw shaft 4.

A magnet 7 is attached to the lower surface of the tip of the magnet holding member 6 with both poles positioned in the left-right direction.

Reference numeral 8 denotes a rod whose intermediate portion is pivoted to the magnet holding member 6 and which moves from side to side together with the magnet holding member 6.

9 is a front wheel that determines the direction of travel of the vehicle;
It is rotatably supported on the shaft.

The swinging member 10 is horizontally rotatable by a bearing member 11 attached to the chassis 1, and its rear end extending diagonally rearward is pivoted to the tip of the rod 8.

12 is a Hall element attached to the chassis 1;
It is arranged so that it is located directly below the magnet 7 when the front wheel 9 is in the straight-ahead direction.

The Hall element generates a Hall voltage in a direction perpendicular to a current and a magnetic field. It is attached to 1.

FIG. 3 is a simplified front view illustrating the positional relationship between the magnet 7 and the Hall element 12.

When the front wheels 9 are in the straight-ahead direction as shown in Fig. 1, as shown in Fig. 3 (
A magnetic field 13 as shown in a) is applied, and the Hall element 12 does not generate voltage.

As shown in FIG. 4, when the direction changing motor 2 is driven and the magnet holding member 6 moves to the right, that is, when the front wheel 9 is steered to the left, as shown in FIG. 3(b), A component of the magnetic flux density vector B of the magnetic field 13 that crosses perpendicularly to the Hall element 12 is generated.

From this, the Hall element 12 generates a Hall voltage.

Similarly, when the magnet holding member 6 moves to the left as shown in FIG. 5, a magnetic flux density vector component that crosses the Hall element 12 vertically downward occurs as shown in FIG. 3(c). Therefore, a voltage having the opposite sign to that shown in FIG. 3(b) is generated.

The output voltage of the Hall element 12 is negatively fed back to the motor drive circuit, and the difference between it and the external input is taken.

Thus, the actual amount of movement of the magnet 7 is detected as the steering angle of the front wheels 9, and the steering angle of the vehicle is appropriately determined.

The steering device for the toy car according to the present invention is constructed as described above and uses a non-contact sensor, especially a Hall element, so that the structure of the device can be miniaturized and can be made into an ultra-compact miniature. It is also possible to install

As a non-contact type sensor, in addition to a Hall element, it is also possible to use a high frequency oscillation type detection coil to detect the amount of movement of the rod, or to use a photoelectric sensor, and is not particularly limited. .

Furthermore, the configurations of the magnet holding member, rod, screw shaft, swinging member, etc. are not limited to those of the embodiment.

〔Effect of the invention〕

The steering device for the toy car according to the present invention is configured as described above, and since the steering angle is corrected using a non-contact sensor, the power of the motor is not directly transmitted to the sensor part, resulting in loss of motor power. This makes it possible to improve the accuracy of operations.

In addition, by using non-contact sensors, it is possible to miniaturize the device configuration, and especially when using Hall elements, it can be used in small vehicles that cannot be installed with conventional potentiometers. It will also be possible to install it.

Furthermore, since the sensor is non-contact, it is possible to provide a product with a long life and durability.

Further, in the present invention, only electrical adjustment is performed and no mechanical adjustment is required, so that the work process can be simplified.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main parts of the steering device in the toy car according to the present invention, Fig. 2 is a sectional view of Fig. 1, and Figs. 3 (a), (b), and (c) are magnets. 4 and 5 are explanatory diagrams of the present device when the direction is changed, and FIGS. 6 and 7 are explanatory diagrams of the conventional example. 1: Chassis, 2 Two-way conversion motor, 3:
Worm gear, 4: Screw shaft, 5: Gear, 7: Magnet, 9: Front wheel, 11: Bearing member, 13: Magnetic field, 6: 8: JO: 12: 14: Magnet holding member, Rod, Swing member, Hall element , rail.

Claims (1)

[Scope of Claims] 1) A direction conversion motor that rotates the front wheels of a vehicle in a steering direction to set a steering angle of the vehicle; and a motor drive circuit that drives the direction conversion motor based on an external input; A toy car comprising a steering angle detection means for detecting a steering angle of a vehicle, wherein a non-contact sensor is used for the steering angle detection means, and the output of the non-contact sensor is negatively fed back to the motor drive circuit to perform steering. A steering device in a toy car characterized by determining an angle. 2) The steering angle detection means rotatably supports each of the two front wheels of the vehicle, and includes two rocking members supported by the vehicle body and rotatable in the horizontal direction; a rod that is pivotally attached to a member and swings the swinging member by moving left and right; a magnet that is attached to a substantially intermediate portion of the rod with both poles positioned in the left-right direction; and a vehicle corresponding to the magnet; 2. A steering device for a toy car according to claim 1, comprising a Hall element attached to a main body, wherein said rod is moved in the left-right direction by a direction conversion motor, and the amount of displacement of said rod is detected as a steering angle. 3) A worm gear attached to the rotating shaft of the direction conversion motor, a screw shaft rotatably supported on the vehicle body and having a gear meshing with the worm gear, and a screw hole screwed into the screw shaft. and a magnet holding member that holds a magnet on the lower surface, the center portion of the rod is pivotally supported by the magnet holding member, and the magnet holding member is moved in the left and right direction in response to the drive of the direction change motor. Moving claim 1 or 2
A steering device in the above-mentioned toy car.