JP2590403B2 - Brake device by transmission of model car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model vehicle in which the speed of a driven shaft, which is an axle, is changed by automatically switching gears of a transmission when the speed of the model vehicle exceeds a predetermined speed. The present invention relates to a brake device for a model car that uses a transmission to apply a brake during deceleration.

[0002]

2. Description of the Related Art Conventionally, in order to apply a brake to a running model car, a brake drum is provided on the inner periphery of the running wheel in advance and a non-rotating brake shoe is brought into contact with the brake drum. When the brakes were applied, the brake shoes were expanded and brought into contact with the brake drum to apply the brakes.

[0003] As another method, a disk is fixed to an axle, and a non-rotating brake shoe for sandwiching the disk from both right and left sides is provided. is there.

[0004]

The brake device for braking such a wheel or axle often locks the wheel, so that the brake is applied to reduce the speed of the model car due to turning a curve. In such a case, there is a danger that the model car will spin out of the course or overturn, etc., due to spin caused by the locking of the wheels.

The present invention solves the problems of the conventional brake device for a model car, and applies braking force to the drive side of the model car in the same manner as an engine brake in a real car, thereby locking the wheels without locking the wheels. It is an object of the present invention to make it possible to perform safe braking.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a brake device using a transmission of a model car for achieving the above-mentioned object, which comprises a first gear having a different diameter provided on a driving side. A second spur gear, a first spur gear provided on the driven side and meshing with the first gear and the second gear; a second spur gear; and a first spur gear and a driven shaft, and a second spur gear and a driven shaft. The brake means is provided with a one-way bearing provided and having a locking direction opposite to each other, and a centrifugal force clutch provided between the second spur gear and the driven shaft.

[0007]

According to the brake device of the present invention, the one-way bearing of the first spur gear is engaged until the speed of the model vehicle reaches a certain speed. Power is transmitted to the driven shaft by the engagement.

During this speed, the centrifugal clutch is not yet in the engaged state, and the one-way bearing of the second spur gear is engaged by the rotation in the opposite direction to the one-way bearing of the first driven gear. Sometimes the second spur gear is disengaged, so that the second spur gear is rotated by meshing with the second gear, but the rotation is not transmitted to the driven shaft.

Thereafter, when the rotation speed of the driven shaft reaches the rotation speed at which the centrifugal force clutch operates, the rotation caused by the meshing of the second gear and the second spur gear is transmitted to the drive shaft. Since the rotational speed of the driven shaft is higher than the rotational speed of the first spur gear, the one-way bearing of the first spur gear is in a loose fit state, the first spur gear rotates freely, and the one-way bearing of the second spur gear also rotates. Since there is no change in the rotation direction, the loose fit state is maintained.

In this state, when the power on the driving side is shifted to the OFF direction, the centrifugal force clutch is disengaged with the decrease in speed, and the rotation speed of the driven shaft becomes smaller than the rotation speed of the first spur gear. Therefore, the one-way bearing of the first spur gear is engaged, and the brake is applied to the driven shaft.

[0011]

Next, an example of an embodiment in which a driving source according to the present invention is a motor will be described below with reference to FIGS. In this embodiment, a first gear 2 having a small gear diameter and a second gear 3 having a large gear diameter are fixedly attached to a motor shaft 1, and the first gear 2 and the second gear 3 always rotate at the same speed as the motor. It has become.

The first spur gear 4 and the second spur gear 5 meshing with the first gear 2 and the second gear 3, respectively, are provided on the driven shaft 6, and the first spur gear 4 and the driven shaft 6, and Between the second spur gear 5 and the driven shaft 6,
First one-way bearing 7 that is engaged when rotated counterclockwise as viewed from the direction of the first gear and the first spur gear 7
And a second one-way bearing 8 which is engaged when rotated clockwise.

The one-way bearings 7, 8 are provided with a plurality of stepped cam surfaces 22 on the inner peripheral surface of an outer peripheral body 21 of a shaft 20 connected to a power source, as shown in FIG. The roller 23 is interposed. When the shaft 20 is rotated in the direction of the arrow, the cam surface 22 and the shaft 20 are rotated.
, The roller 23 is pressed against the outer peripheral body 21 to lock the shaft 20 and the outer peripheral body 21, and the shaft 20 and the outer peripheral body 21 rotate in the same direction, but are rotated in the opposite direction to the arrow. In this case, the rollers 23 are pushed toward the wide side of the cam surface 22 so that the outer peripheral body 21 and the shaft 20 are free.

A centrifugal force clutch 9 is attached to the driven shaft 6, and when the centrifugal force clutch 9 becomes higher than a predetermined speed, a flange 10 which comes into contact with the outer periphery thereof to be engaged is provided with a second. It is provided on the side surface of the spur gear 5.

Next, a description will be given of the operation based on the above-described configuration. When the motor starts rotating, the first gear 2 and the second gear 3 attached to the motor shaft 1 start rotating, and mesh with this. Both the first spur gear 4 and the second spur gear 5 are driven.

However, the first one-way bearing 7 provided on the first spur gear 4 and the second one-way bearing 8 provided on the second spur gear 5 use the cam provided on the outer peripheral body 21 as described above. Since the direction of the surface 22 is reversed, the first one-way bearing 7 is engaged (hereinafter referred to as closed), while the second one-way bearing 8 is disengaged (hereinafter referred to as open).

For this purpose, the rotation of the motor is transmitted to the drive shaft 6 via the first gear 2, the first spur gear 4, and the first one-way bearing 7. The rotation of the 2 spur gear 5
Because the one-way bearing 8 is open, the drive shaft 6
Is a state unrelated to the rotation of. In FIG. 3, a portion indicated by an arrow indicates a driving force transmission path.

As described above, the rotation of the motor is
When the rotation of the motor is increased and the rotation of the driven shaft 6 reaches a certain speed or more while being transmitted from the gear 2 to the driven shaft 6, the centrifugal clutch 9 attached to the driven shaft 6
The spur gear 5 is engaged with the flange 10, and the rotation caused by the engagement of the second gear 3 and the second spur gear 5 is transmitted from the centrifugal clutch 9 to the drive shaft 6.

Therefore, since the rotation speed of the driven shaft 6 becomes higher than the rotation speed of the first spur gear 4, the rotation of the first one-way bearing 7 acts in the same manner as the rotation in the reverse direction. The one-way bearing 7 is opened, and the rotation of the first spur gear 4 is not transmitted to the drive shaft 6, but the other second one-way bearing 8 remains open because the relationship between the driven shaft 6 and the second spur gear 5 does not change. I keep it. In FIG. 4, a portion indicated by an arrow indicates a driving force transmission path.

In this state, when the power supply to the motor is reduced, the speed of the drive shaft 6 is reduced. However, the centrifugal force clutch 9 is in the engaged state until the rotation speed of the drive shaft 6 decreases to the above-mentioned constant speed. Because of the inertia of the drive shaft 6,
The spur gear 5 is rotated via the second one-way bearing 8, and the motor receives a driving force from the drive shaft 6, and a counter electromotive force is generated in the motor to brake the drive shaft 6. .

When the rotational speed of the drive shaft 6 becomes lower than a certain value due to the above-mentioned braking action, the contact state between the centrifugal force clutch 9 and the ring 10 is released, and the centrifugal force clutch 9 to the second spur gear 5 is released. There is no transmission of rotation. On the other hand, since the first gear 2 and the first super gear 4 are in the engaged state, and the gear ratio of the two gears 2 and 4 is large, a large reduction ratio acts and the first one-way bearing 7 , The driven shaft 6 directly receives the reduced driving force from the first gear, and the brake is applied,
Slow down. In FIG. 5, a portion indicated by a wave arrow indicates a path for transmitting the deceleration force.

[0022]

As described above, according to the present invention, when the driving of a motor or the like is stopped or decelerated for a running model vehicle, the running force of the model vehicle is used as a braking source. The same action as when the engine brake of the actual vehicle is applied to the automobile can be exerted.

Therefore, there is no possibility that the wheels are locked or the like which brakes the wheels by friction, so that the possibility of out of course or overturning when turning a curve can be prevented, and the brake device may be used depending on the model vehicle. Need not be separately installed, and the operation is assured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in an exploded state.

FIG. 2 is a front view showing a one-way bearing.

FIG. 3 is an explanatory perspective view of a state in which the embodiment is driven at a first speed.

FIG. 4 is an explanatory perspective view of a state where the vehicle is driven at the second speed.

FIG. 5 is an explanatory perspective view of the same brake state.

[Explanation of symbols]

 2 First gear 3 Second gear 4 First spur gear 5 Second spur gear 6 Driven shaft 7 First one-way bearing 8 Second one-way bearing 9 Centrifugal clutch

Claims (1)

(57) [Claims] A first gear having a different diameter provided on a driving side;
A second gear, the first gear provided on the driven side, and the second gear;
A first spur gear meshing with the gear, a second spur gear, a one-way bearing provided between the first spur gear and the driven shaft, and between the second spur gear and the driven shaft and having locking directions opposite to each other; A centrifugal force clutch provided between a second spur gear and a driven shaft.