KR19980054757A - Brake device of automobile with planetary brake - Google Patents

Abstract

The present invention relates to a brake apparatus of a motor vehicle having a planetary brake composed of a planetary tire that rubs with a main tire to apply a braking force.

According to the present invention, a planetary tire mounted on the front of the tire of the vehicle to generate a braking force by friction between the tire and the road surface, a stretching mechanism connected to the axle to contact the planetary tire with the tire, and rotating the planetary tire A brake device is provided, including a planetary brake made by including a rotating mechanism.

Description

Brake device of automobile with planetary brake

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake apparatus of a motor vehicle, and more particularly, to a brake apparatus of an automobile having a planetary brake composed of a planetary tire that is friction with a main tire to apply a braking force.

A brake device for a vehicle for decelerating or stopping a driving vehicle, comprising: a drum break that generates a braking force by friction between a drum and a brake lining, and a friction pad on a disc that rotates with the wheel; ) Can be classified into a disc brake that generates a braking force by rubbing).

The drum brave 101 is mainly used for the rear wheel of a large vehicle or a small vehicle, as shown in FIG. 1, and is operated by a brake pedal provided at the bottom of the driver's seat. When the driver presses the brake pedal, the master cylinder is pressurized. The hydraulic pressure generated thereby acts on the piston of the wheel cylinder 105 via the brake pipe. The wheel cylinder 105 compresses the brake shoe 104 to the drum 102 by the operation of the piston, and the brake lining 103 provided in the brake shoe 104 generates friction by friction with the inner wall of the drum 102. To brake the car. Reference numeral 107 denotes a return spring for the return of the brake shoe 104.

On the other hand, the disc brake is mainly mounted on a small vehicle such as a passenger car because of the advantages of excellent heat dissipation performance, prevention of one-side braking, simple configuration, etc., the disc brake is mounted on the disc 108 as shown in FIG. And a braking force is applied by friction between the caliper assembly 110 having the friction pad 109 therein and the disk 108.

Although such a conventional brake device exhibits a braking force effectively, in some cases, a larger braking force is required than in a conventional brake device, and in particular, it is a problem to shorten the braking distance regardless of the road surface condition.

SUMMARY OF THE INVENTION The present invention has been developed in response to such a demand, and a basic object of the present invention is to provide a brake device having a novel structure capable of shortening the braking distance by applying an additional braking force in addition to the braking force of the conventional brake device.

In order to achieve the above object, in the present invention, the planetary tire is mounted on the front of the tire of the vehicle to generate a braking force by friction between the tire and the road surface, and an expansion mechanism connected to the axle to contact the planetary tire with the main tire; It is provided with a brake device comprising a planetary brake comprising a rotating mechanism for rotating the planetary tire.

In one embodiment of the present invention, the expansion mechanism is composed of a connecting rod for mounting the planetary tire, and a hydraulic cylinder connected to the wheel shaft to move the connecting rod by the hydraulic pressure supplied from the wheel shaft A brake device is provided.

In addition, as another embodiment of the present invention, the rotation mechanism for rotating the planetary brake is composed of a fixed knob formed on the axle, and a return spring connected to the connecting knob of the fixed knob and the expansion mechanism to apply an elastic force A brake device is provided.

1 is a schematic diagram of a conventional drum brake,

2 is a schematic diagram of a conventional disc brake,

3 is a schematic diagram showing a braking process of a planetary brake according to the present invention;

4 is a front view of the planetary brake shown in FIG. 3;

5 is a schematic view showing the expansion mechanism of the planetary brake according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: main tire 2: wheel axle

3: planetary tire 4: expansion mechanism

5: connecting rod 6: spring

7: return spring 8: hydraulic cylinder

9: rod 10: fixed knob

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention and the configuration of an embodiment according to the present invention.

Figure 3 shows the shape of applying a braking force to the tire using the planetary brake according to the present invention. The planetary tire 3 of the planetary brake is mounted in front of the main tire 1 of the automobile.

FIG. 4 shows the mounting shape of the planetary tire 3 shown in FIG. 3 in the running direction of the vehicle. The planetary tire 3 located in front of the main tire 1 is mounted on an internal rod 9 like a roller, and both ends of the rod 9 are connected to an expansion mechanism 4, and the expansion mechanism 4 The other end of) is rotatably connected to the wheel shaft (2).

FIG. 5 illustrates the expansion mechanism 4 and the rotation mechanism of the planetary brake in detail. The expansion mechanism 4 of the planetary tire 3 includes a connecting rod 5 connected to the rod 9 and a wheel. It consists of a hydraulic cylinder 8 which expands and contracts the said connecting rod by the hydraulic pressure supplied from the.

Specifically, one end of the connecting rod 5 is inserted into the hydraulic cylinder 8, and the hydraulic cylinder 8 receives hydraulic pressure from the wheel shaft 2 to press the connecting rod 5 to pull or push the planetary tire. Move (3) horizontally.

A fixed knob 11 is installed on the wheel, and a return spring 7 is installed between the fixed knob 10 and the hydraulic cylinder 8 for the return of the expansion and contraction mechanism 4. The knob 10 and the return spring 7 rotate the planetary tire 3 to contact the main tire 1 when the braking operation is terminated or when the braking operation is started in the rest state as described below. Configure the rotating mechanism.

Next, with reference to Figures 3, 4 and 5 will be described the operation relationship of the planetary brake according to the present invention.

In the state where braking is not necessary, the planetary tire 3 is kept in an elevated state so as not to come into contact with the main tire 1 as shown by the dotted line.

When the driver presses the brake pedal to start braking, the hydraulic pressure is supplied to the hydraulic cylinder 8 of the expansion and contraction mechanism 4 through the wheel shaft 2. Accordingly, the planetary tire 3 is rotated to a position where the planetary tire 3 can come into contact with the road surface by the rotating mechanism, and at the same time, the connecting rod 5 is pulled by the operation of the hydraulic cylinder 8 so that the planetary tire 3 is the main tire. It comes in contact with (1).

When the driving direction of the vehicle is A, the rotational direction of the wheel, that is, the rotational direction of the main tire 1 is the same as the arrow B. Since the planetary tire 3 is in contact with the main tire 1, the rotational direction of the planetary tire 3 becomes C direction. Therefore, a braking force is applied by friction between the main tire 1 and the planetary tire 3. At the same time, the planetary tire 3 is in contact with the road surface, and the rotational direction of the planetary tire 3 becomes opposite to the traveling direction of the vehicle, whereby a frictional force is applied in the opposite direction to the traveling direction of the vehicle, thereby providing greater Braking force is generated.

When the pressurized state of the brake pedal is released, the connecting rod 5 is pushed out by the hydraulic cylinder 8 of the expansion and contraction mechanism 4 to release the friction state between the planetary tire 3 and the main tire 1 and simultaneously rotate the rotation mechanism. By the return spring 7 of the entire planetary brake device is moved to the rest position shown by the dotted line in FIG.

As described above, the brake device of the present invention may further generate a braking force due to friction between the planetary tire and the main tire by contacting the planetary tire in front of the main tire.

In addition, since the planetary tire has a rotational direction opposite to that of the main tire and rubs against the road surface, the braking force of the entire brake can be increased due to the large frictional force between the planetary tire and the road surface.

Thus, in the brake device of the present invention, by mounting the planetary brake, a greater braking force can be applied than the conventional brake device, whereby the braking distance can be shortened and the safety of the vehicle can be improved.

Claims (3)

A planetary tire mounted on the front of the tire of the vehicle to generate a braking force by friction between the tire and the road surface, an expansion mechanism connected to the axle to contact the planetary tire with the tire, and a rotation mechanism to rotate the planetary tire; Brake device comprising a planetary brake made. 2. The expansion mechanism according to claim 1, wherein the expansion mechanism comprises a connecting rod for mounting the planetary tire and a hydraulic cylinder connected to the wheel shaft to move the connecting rod forward and backward by hydraulic pressure supplied from the wheel shaft. Brake device. The rotating mechanism for rotating the planetary brake comprises a fixed knob formed on the axle, and a return spring connected to the connecting rod of the fixed knob and the telescopic mechanism to apply an elastic force. Brake device.