KR19980049145A - Automatic parking brake - Google Patents

Abstract

The present invention relates to an automatic parking brake device for an automobile, and the automatic parking brake device according to the present invention includes a hydraulic brake 30 for a parking brake according to the present invention on a brake line 20 directed to a rear wheel by an operation of a pedal. It is configured by installation. In addition, the hydraulic cylinder 30 is operated by the switch 40 installed in the interior of the vehicle, compresses the oil in the brake operating oil line 20 to operate the brakes mounted on the rear wheels 25, 26 to operate the parking brake. Use the way it works. In the hydraulic cylinder 30 according to the present invention, a piston 31 for compressing hydraulic oil is installed therein, a piston rod 32 of the piston 31 is provided with a position fixing means 33, and a piston rod 32. The end of is connected to the actuator 36 is configured to move the piston 31 forward and backward by the operation of the actuator 36. On the other hand, a pair of solenoids 50 are provided on the side wall of the rear end of the cylinder 30, provided with a stopper bar 51 which is advanced by the spring 53 and retracts when the switch 40 is turned off.

Accordingly, by using the automatic parking brake device according to the present invention, by simply installing an additional hydraulic cylinder in the conventional hydraulic brake system, the cable type operation mechanism can be deleted, thereby simplifying the configuration of the parking brake. In addition, the parking brake is automatically operated by the operation of the switch installed in the room has the advantage that the operation of the parking brake is also convenient.

Description

Automatic parking brake

The present invention relates to a parking brake of an automobile, and more particularly to an automatic parking brake using hydraulic pressure.

A brake system is an important device used to keep a car parked at the same time as decelerating or stopping a driving car. In general, a brake system converts the kinetic energy of the car into thermal energy using a friction force and releases it into the atmosphere. Friction brakes with braking action are used.

In addition, various types are used for the braking device, and there are a main brake for braking when driving and a parking brake for parking. The main brake is called a foot brake because it is operated by the driver's foot, and the parking brake is also called a hand brake because it is mainly operated by hand.

Depending on how the brake is operated, there are mechanical methods using hydraulic loads and wires and hydraulic types using hydraulic pressure. In general, the foot brake is hydraulic and the parking brake is mechanical.

In addition, brakes are mainly used for drum type brakes and disc brakes, and the disc brakes are braked by hydraulic pressing of the brake linings on both sides of the brake discs rotating together with the wheels. Also called (caliper type brake).

On the other hand, the drum-type brake is composed of a wheel cylinder, a brake shoe, a back plate and a brake drum, the brake shoes are provided by pressing the brake shoes installed on both sides toward the circumferential inner surface of the brake drum with a wheel cylinder to achieve a braking action of the brake.

1 shows a configuration of a general hydraulic brake system. For convenience of illustration, only the wheels on one side of the front and rear wheels are illustrated.

As shown, when the brake pedal 1 is operated, the piston 2a in the master cylinder 2 is advanced by the push rod 1b connected to the pedal arm 1a, thereby compressing the brake oil in the cylinder 2. The brake oil is compressed through the brake lines 3 and 4 on the front and rear wheels, and the wheel cylinder 6 of the caliper (front wheel side) or brake shoe (rear wheel side) communicating with the ends of the brake lines 3 and 4. , 8) by supplying the brake oil of high pressure to press the lining or pad to the brake drum (10, internal expansion type) or disk (caliper type, front wheel side) to be braked by friction. In addition, releasing the brake pedal causes the brake oil to be returned to the master cylinder 2 to release the brake.

On the other hand, the parking brake of the vehicle is composed of a cable method separately from the hydraulic brake, and a cable method of operating the brake lever to operate the brakes on both sides of the rear wheel is mainly used.

Such mechanical parking brakes are generally classified into two types, a cross pull type mainly used in commercial vehicles and a forward pull type mainly used in passenger cars.

The forward pull type refers to a parking brake in which the front cable fixed to the parking brake lever is branched to the brakes of the left (LW) and right (RW) wheels by an equalizer.

In contrast, the cross-pull type means that the cable is connected from the parking brake lever to either side of the left (LW) or right (RW) wheel and is moved inward to each other in a pair to operate the other side near the middle of the rear axle. It is connected to the photo cable to operate the brakes of the rear wheels on both sides.

2 shows the configuration of the forward pull type parking brake. As shown, pulling the brake lever 11, the front cable 17 connected to the lever 11 and the equalizer 18 coupled to the front cable 17 and a pair of rear cables mounted to the equalizer 18 ( 19 is pulled toward the lever 11 and brakes of the rear wheels 16 and 17 are actuated in accordance with the tension of the rear cable 19.

On the other hand, Figure 3 shows a detailed configuration of the general parking brake lever assembly. As shown in the drawing, the conventional brake lever 11 is installed via a spring 12a provided at the end of the parking brake release button 12 at the distal end 11a, and the release rod 15 is provided at the button 12. It is fixed and a pawl 16 is provided at the end of the release rod 15. On the other hand, the lower end of the lever 11 is hinged to the ratchet plate 13, the rotation is freely installed around the ratchet plate 13, the ratchet gear 14 is provided on the front of the ratchet plate 13 Formed and engaged with the fouling 16.

Accordingly, when the parking brake lever 11 is rotated in the clockwise direction, the cable 17 is tensioned and the pole 16 is rotated along the ratchet gear 14 of the ratchet plate 13 to stop the lever 11. In this position it engages with the ratchet gear 14 to support the lever 11.

On the other hand, in order to release the parking brake, when the release button 12 at the tip of the parking brake lever 11 is pressed, the release rod 15 is pushed to rotate the fouling 16 so that the ratchet gear 14 of the ratchet plate 13 can be rotated. Follo (16) is separated from the lower lever (11) by loosening the tensioned parking cable 17 to release the parking brake.

Since the conventional parking brake is configured to operate by manually tensioning the cable 17, it is not only inconvenient to operate, but when the lever 11 is not sufficiently tensioned, the brake shoe does not come into close contact with the drum, and thus the braking force is insufficient, such as on a hill road. In case of parking, the risk of safety accident is inherent due to the inadvertent movement of the car.

In addition, in the conventional parking brake, when the button 12, which is the lock device of the parking brake, is released due to a malfunction after the operation of the lever 11, the cable is relaxed, and the brake is separated from the drum or spaced apart, so that the vehicle may move and risk a safety accident. Is inherent.

Accordingly, an object of the present invention is to provide a hydraulic automatic parking brake apparatus using the conventional hydraulic main brake configuration.

1 is a schematic configuration diagram showing a schematic configuration of a conventional brake system.

Fig. 2 is a schematic configuration diagram showing the configuration of a forward pull type parking brake.

3 is a cross-sectional view of the parking brake lever assembly showing the configuration of a general parking brake lever.

4 is a configuration diagram showing the configuration of the automatic parking brake apparatus according to the present invention.

Fig. 5 is a sectional view of the hydraulic brake cylinder for parking brake showing the state of the hydraulic cylinder in the parking brake non-operation state.

Fig. 6 is a sectional view of the hydraulic brake cylinder for parking brake showing the state of the hydraulic cylinder in the parking brake operating state.

7 is a cross-sectional view showing the configuration of a solenoid according to the present invention.

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

20: Brake oil line 25, 26: rear wheel

30: hydraulic cylinder 31: piston

32: piston rod 33: position fixing means

33a: contact surface 33b: vertical fixed surface

36: actuator 40: switch

50: solenoid 41: stopper bar

52: solenoid coil 53: spring

In order to achieve this object, the present invention provides an automatic parking comprising a hydraulic cylinder installed in a brake fluid line directed to the rear wheel of a hydraulic brake device, an actuator operative to compress the hydraulic fluid in the hydraulic cylinder, and a switch for operating the actuator. Provide a brake device.

In addition, the present invention provides an automatic parking brake device configured to fix the piston advanced by the actuator by installing a stopper solenoid behind the piston rod having a position fixing means and the piston of the hydraulic cylinder.

In addition, the present invention provides an automatic parking brake apparatus having a stopper bar supported so that the solenoid is elastically protruded therein, the stopper bar is retracted into the solenoid by the operation of the solenoid.

In addition, the present invention provides an automatic parking brake device using a position fixing means having a conical stopper bar contact surface on the front surface as a position fixing means of the piston rod, and a fixing surface having a right angled surface on the rear surface.

Accordingly, by using the automatic parking brake apparatus according to the present invention, simply installing an additional hydraulic cylinder in the conventional hydraulic brake system can eliminate the cable type operation mechanism, thereby simplifying the configuration of the parking brake.

In addition, the parking brake according to the present invention has an advantage that the operation of the parking brake is also convenient because it operates automatically by the operation of the switch installed in the room.

In addition, since the parking brake according to the present invention operates with a constant force by the hydraulic cylinder, it is possible to contribute to the prevention of safety accidents due to malfunction of the parking brake or loosening of the cable.

Hereinafter, the configuration of the automatic parking brake device according to the present invention with reference to the accompanying drawings will be described in more detail.

4 shows the overall configuration of the automatic parking brake apparatus according to the present invention.

As shown, the automatic parking brake apparatus according to the present invention is configured by installing the hydraulic brake 30 for parking brake according to the present invention on the brake line 20 from the master cylinder to the rear wheel.

In addition, the hydraulic cylinder 30 according to the present invention operates by the switch 40 installed in the interior of the vehicle, compresses the oil in the brake operating oil line 20 to operate the brakes mounted on the rear wheels 25 and 26. To operate the parking brake.

Accordingly, the parking brake according to the present invention utilizes the hydraulic brake which is the main brake as the parking brake without using the configuration of the parking brake lever and the cable according to the conventional cable method, thereby simplifying the overall configuration of the brake system.

In addition, the parking brake according to the present invention is automatically operated by the operation of the switch has the advantage that the operation is easier than the conventional parking brake pulling the lever.

5 and 6 show the configuration of the hydraulic cylinder 30 for parking brake according to the present invention.

As shown, the hydraulic cylinder 30 according to the present invention is provided with a piston 31 for compressing the hydraulic fluid therein, a position fixing means 33 is formed on the piston rod 32 of the piston 31 and the piston The end of the rod 32 is connected to the actuator 36 and is configured such that the piston 31 moves forward and backward by the operation of the actuator 36.

On the other hand, a pair of solenoids 50 are provided on the side wall of the rear end of the cylinder 30 with a stopper bar 51 which is advanced by the spring 53 (FIG. 6) and retreats by supply of power.

As shown in FIG. 7, the solenoid 50 according to the present invention includes a stopper bar 51 configured to protrude downward by being supported by an upper spring 53 therein, and on the outer circumference of the stopper bar 51. When the solenoid coil 52 for retracting the stopper bar 51 is mounted and the power is applied to the coil 52, the stopper bar 51 operates to draw the inside.

However, if the electromagnet is installed on the top of the spring 53 and the power is applied, the stopper bar 51 may be configured to pull the stopper bar 51, and various other types of solenoids may be used. Thus, the solenoid 50 illustrated in FIG. 7 is for illustrative purposes only and does not limit the invention.

Accordingly, the stopper bar 51 of the solenoid 50 according to the present invention has a fixed position having a conical contact surface 33a in the circumferential direction on the front side as shown in FIG. 5 in the non-operating state of the cylinder 30. The contact surface 33a of the means 33 is elastically contacted.

On the other hand, as shown in Fig. 6, when the actuator 36 is operated and the piston 31 is advanced, the stopper bar 51 is in the mirror at the inclined contact surface 33a of the position fixing means 33 described above. After the installed spring 53 is compressed and retracted, the right angle portion 33b on the rear surface of the position fixing means 33 passes and then advances again with the restoring force of the spring 53 to move the position fixing means 33 to FIG. 6. It is a stopper fixed at the forward position shown. Thus, the actuator 30 operates to advance only when the parking brake switch 40 is on and it is necessary to provide further actuation force after the stopper bar 51 protrudes to the rear of the position fixing means 33. There will be no.

Subsequently, when the switch 40 is turned off to release the parking state, power is supplied to the solenoid 50 so that the stopper bar 51 of the solenoid 50 is introduced into the inside, and at this time, the position of the piston rod 31 is fixed. As the means 33 are released from the stopper bar 51 and retracted by the hydraulic pressure of the hydraulic line 20, the hydraulic pressure acting on the rear wheel is released, so that the brake is released.

At this time, in order to smoothly retract the piston, the return spring of the piston may be installed in the operation cylinder 30 or the actuator 31.

Accordingly, by using the automatic parking brake device according to the present invention, simply installing an additional hydraulic cylinder in the conventional hydraulic brake system can eliminate the cable type parking brake operating mechanism, thereby simplifying the configuration of the parking brake. .

In addition, the parking brake according to the present invention has an advantage that the operation of the parking brake is also convenient because it operates automatically by the operation of the switch installed in the room.

In addition, since the parking brake according to the present invention operates with a constant force by the hydraulic cylinder, it is possible to contribute to the prevention of safety accidents due to malfunction of the parking brake or loosening of the cable.

Although one specific embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various changes and modifications may be made by those skilled in the art based on the technical idea of the present invention.

Claims (4)

An automatic parking brake device comprising a hydraulic cylinder installed in a brake hydraulic oil line directed to a rear wheel of a hydraulic brake device, an actuator operative to compress hydraulic oil in the hydraulic cylinder, and a switch for operating the actuator. 2. The automatic parking brake apparatus according to claim 1, wherein the piston rod is provided with a position fixing means, and a stopper solenoid is installed behind the piston of the hydraulic cylinder to fix the piston advanced by the actuator. . The automatic parking brake apparatus of claim 2, wherein the stopper bar is retracted into the solenoid by the operation of the solenoid by having a stopper bar supported so that the solenoid is elastically protruded therein. 3. The automatic parking brake apparatus according to claim 2, wherein the position fixing means has a conical stopper bar contact surface on the front surface and a fixed surface at right angles on the rear surface.