KR100589195B1 - Electromotive automatic brake system for vehicle - Google Patents

Abstract

The present invention relates to a motor-driven automatic brake device, wherein the lead screw (5) is connected to the final driven gear (4) driven by the motor (2) in a screw-treated manner, the front and rear ends of the lead screw (5) The rods 5a and 5b are connected to the main brake cable 10 connected to the brake pedal 12 and the equalizer 7 of the parking brake cable 9, and the motor 2 has an ignition switch and a wheel speed. Operated by an electronic control unit 13 that receives information from sensors, brake switches, accelerator pedal switches, inclination angle sensors, engine speed sensors, etc., and judges situations such as parking, emergency braking, stopping, restarting after a stop, and starting a hill road. Controlled.

Therefore, the main brake is automatically activated and released when the vehicle is stopped and subsequently restarted, so that the driving is not only convenient, but also the function is performed more quickly and smoothly, and the driving feeling is improved. The function is effectively implemented.

In addition, since all four wheel brakes operate, stability during braking is improved, and there is no need to increase the capacity of the motor, thereby preventing weight increase and saving costs, and reducing the amount of wear of the brake pads.

Description

Electric automatic brake system for automobiles

1 is a block diagram of an electric automatic brake device for a vehicle according to the present invention;

2 is a side view of the A direction of FIG.

Figure 3 is an exploded perspective view of the connecting member and equalizer of Figure 1;

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

1: housing, 2: motor,

3: gearbox, 4: final driven gear,

5: lead screw, 5a, 5b: connecting rod,

5c, 5d: stopper, 5e: slider,

6: connecting member, 7: equalizer,

8: bearing, 9: parking brake cable,

10: main brake cable, 10a, 10b: connector,

11: dash panel, 12: brake pedal,

13: Electronic control unit.

The present invention relates to an electric automatic brake device for an automobile, and more particularly, to an electric automatic brake apparatus for an automobile, which enables more efficient and smooth driving by automatically operating the main brake and the parking brake as needed.

In general, a parking brake device of a vehicle is configured to allow a driver to pull the parking brake lever and operate the rear brake assembly through a cable to keep the rear wheel locked.

However, in recent years, an electric parking brake device that can pull a parking brake cable by using a motor and a reducer has been developed and applied. The electric parking brake device maintains a simple parking state by controlling the operation of the motor with an electronic control unit. In addition to the function, it provides various functions such as automatic operation at stop, automatic release at departure and prevention of jungle at the departure of hill.

However, in the conventional electric parking brake device as described above, since the brake assembly of the rear wheel is mechanically connected directly to the motor through the parking brake cable, a considerable load is applied to the motor during operation.

Therefore, the speed of pulling and releasing the parking brake cable is not instantaneous, so it is not smooth driving when performing the functions such as automatic operation at the stop and automatic release at the start (the driving feeling is not good), and also the rear brake pad Excessive wear may occur.

To solve this problem, it is necessary to use a motor of a larger capacity or with the help of an electronically controlled hydraulic brake system (for example, an ABS system). Therefore, in order to use the existing electric parking brake, there is a restriction to use an expensive electronically controlled hydraulic brake device in parallel, or when a large capacity motor is used, the size and weight of the motor are increased, and the cost is increased and power consumption is also increased. There is a problem that increases.

Accordingly, the present invention has been made in view of the above-mentioned problems, and the main brake is operated instead of the parking brake when performing functions such as automatic operation at the stop and automatic release at the start related to the driving feeling. Not only can it generate a large braking force, but also the braking and releasing action can be performed quickly to improve driving feeling, and when the car parks, it provides a motorized automatic brake device that generates a parking braking force by automatically pulling the parking brake cable. There is a purpose.

The present invention for achieving the above object, the motor assembly consisting of a motor and a reduction gear box connected to the output shaft of the motor mounted on the housing; A final driven gear whose female thread is processed at the center as a final output gear of the reduction gear box; It is connected to the female screw of the final driven gear by screw treatment, and connecting rods are integrally formed at the front and rear portions, and the main brake cable connected to the brake pedal is connected to the front connecting rod, and the parking brake cable is connected to the rear connecting rod. An equalizer connected to the lead screw, the lead screw having a slider integrally formed at a front end with a slider sliding forward and backward in a non-rotating state in a guide integrally formed in the housing; When the vehicle is parked or emergency braking is required by receiving signals from the ignition switch, wheel speed sensor, brake switch, accelerator pedal position sensor, inclination angle sensor and engine speed sensor for judging the state of the vehicle, When starting again after stopping, it is configured to include an electronic control unit for controlling the operation of the motor to operate the parking brake or the main brake according to the departure from the hill.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 is a configuration diagram of the electric brake system according to the present invention.

The housing 1 is fixedly installed on a floor panel of a vehicle, and a motor assembly composed of a motor 2 and a reduction gear box 3 is mounted to the housing 1. The reduction gear box 3 drives a final driven gear 4 which is finally located at the center of the inner space 1a of the housing 1 as a reduction gear train connected to the output shaft of the motor 2.

The final driven gear 4 has a female screw hole in the center thereof, and a lead screw 5 is connected to the female screw hole in a threaded manner.

Connecting rods 5a and 5b are integrally formed at front and rear ends of the lead screw 5, respectively, and the connecting rod 5a of the front is connected to the main brake cable 10 connected to the brake pedal 12. The rear connecting rod 5b is connected to the equalizer 7 of the parking brake cable 9 connected to the rear wheel brake assembly.

Meanwhile, as shown in FIG. 2, a rectangular slider 5e is integrally formed at the front end of the lead screw 5, that is, at the portion to which the connecting rod 5a of the front is connected. An inner space is integrally formed on one side of the housing 1 and an inner space is accommodated in the guide 1c formed of a hole having the same shape as the slider 5e. Therefore, since the slider 5e is not rotated and is only capable of forward and backward movement, the lead screw 5 integrated with the slider 5e is not rotational and only forward and backward movement is possible. That is, the lead screw 5 is moved forward and backward in the axial direction without rotating as the final driven gear 4 is rotated forward and backward by the mutual relationship between the guide 1c and the slider 5e.

In addition, the outer surface of the housing 1 on which the guide 1c is formed is formed with the same receiving portion 1b as the guide 1c to accommodate the rear end of the lead screw 5, the lead screw 5. 2 is supported by the slider 5e and the final driven gear 4 so that no further support is required, and the movement in the rotational direction is also constrained by the slider 5e, so that the inner surface of the receiving portion 1b is simply cylindrical. It only needs to be formed into a hole to accommodate the rear end of the lead screw 5.

Connection rods 5a and 5b are integrally formed at the front and rear ends of the lead screw 5, respectively. (It may be made of a separate product and fixed.)

The front connecting rod 5a is connected to the main brake cable 10. A cylindrical cylindrical connector 10a is fixed to the rear end of the main brake cable 10, and into the inside of the connector 10a. The connecting rod 5a is inserted, but a stopper 5c is formed at the end of the connecting rod 5a, so that the engaging rod formed at the inlet of the stopper 5c and the connector 10a is mutually caught. 5a and the main brake cable 10 are connected.

A spring 14a is provided between the stopper 5c of the connecting rod 5a and the engaging jaw of the connector 10a.

Therefore, when the lead screw 5 is retracted, the main brake cable 10 can be pulled (a buffering action is performed by the spring 14a during operation), and the lead that is pulled when the lead screw 5 is moved forward. The brake cable 10 can be restored to its original shape by the action of the brake pedal 12 returning spring (not shown).

However, the front end of the structure-main brake cable 10 connected so that the front space in the connector 5a and the main brake cable 10 can only pull the brake pedal 12 is the dash panel 11 of the brake pedal 12. The main brake is not actuated when the lead screw 5 is moved forward by inserting the penetrating insert from the side to the interior and fixing a simple cylindrical cylindrical connector 10b at its end.

On the other hand, the rear end of the lead screw (5) is coupled to the equalizer (7) connected to the parking brake cable (9) at both ends via the connecting member (6), the connecting member (6) as shown in FIG. Likewise, as a rectangular parallelepiped member inserted into the internal space of the equalizer 7, circular projections 6a inserted into the coupling holes formed in the equalizer 7 are formed on both sides, and the circular holes 6b in the front-rear direction are formed. This is a formed shape.

Therefore, the connecting rod 5b connected to the rear end of the lead screw 5 is inserted through the hole 6b of the connecting member 6 fixed to the equalizer 7, and is attached to the rear end of the connecting rod 5b. As the topper 5d is fixed integrally, the rear connection rod 5b and the equalizer 7, that is, the parking brake cable 9 are connected.

In addition, a spring 14b is provided between the stopper 5d and the connection member 6 to provide a shock absorbing action.

Therefore, when the lead screw 5 is advanced, the parking brake cable 9 is pulled through the equalizer 7, and the parking brake cable 9, which was pulled when the lead screw 5 is retracted, is installed in the rear brake assembly. The return spring (not shown) is capable of returning to its original position.

Here, although the parking brake can be operated by pulling the equalizer 7 by the rear connecting rod 5b and pulling the parking brake cable 9, the parking brake cable 9 is connected by the cable, so that the equalizer 7 Even if) is pushed, it has no effect on the rear brake assembly. In addition, since the amount of forward and backward movement of the lead screw 5 due to the rotation of the final driven gear 4 is not so large, the rear end of the lead screw 5 and the equalizer 7 are not in contact with each other.

That is, the main brake cable 10 and the parking brake cable 9 may be pulled in accordance with the forward and backward movement of the lead screw 5, but cannot be pushed.

On the other hand, as described above, the front end of the main brake cable 10 penetrates the brake pedal 12 in the direction toward the interior from the dash panel 11, the small cylindrical connector (10b) is fixed to the end Since the main brake cable 10 is pulled backwards, the brake pedal 12 is pulled (the same state as the driver stepping on the brake pedal by foot), but the main brake can be operated. The main brake cable 10 cannot be pulled forward by stepping on the brake pedal 12. That is, the operation of the brake pedal 12 by the driver has no influence on the operation of the present invention, whereby the driver can freely operate the main brake at his or her will when desired, regardless of the operation of the present invention.

On the other hand, the final driven gear (4) is located in the center of the space portion (1a) of the housing (1), bearings (8) are respectively installed on both sides are transmitted through the reduction gear box (3) in a stable support state It is rotated by the driving force of the motor 2.

Meanwhile, the motor 2 in the motor assembly is operated and controlled by the electronic control unit 13, which includes an ignition switch, a wheel speed sensor, a brake switch, an accelerator pedal position sensor, an inclination angle sensor, and an engine. The speed sensor is connected. Of course, information is also input from various other vehicle sensors.

The electronic control unit 13 rotates the motor 2 forward if the state of the vehicle is parked by the information input from the sensors and switches, or if the main brake is broken or emergency braking is required by the parking brake. To operate the parking brake, while the parking brake is turned on and the motor 2 is reversed to start the parking brake.

On the other hand, when the vehicle is stopped while driving, the main brake is operated by rotating the motor 2 reversely, and when starting after stopping, the main brake is rotated again so that the main brake can be released. In the case of the vehicle, the main brake can be released when the driver's engine speed is generated so that the driver steps on the accelerator pedal so that the vehicle can not be pushed on the hill road.

The operation of the present invention will now be described.

When the ignition switch is turned off while the brake switch is on and the wheel speed sensor output value is 0, the electronic control unit 13 determines that the driver intends to park the vehicle and rotates the motor 2 forward.

As a result, the final driven gear 4 is rotated forward and the lead screw 5 is advanced so that both parking brake cables 9 are pulled through the equalizer 7 so that both rear wheels are parked and braked. The parking brake cable 9 is kept in a pulled state due to the reversal prevention principle caused by the friction between the final driven gear 4 and the lead screw 5 connected to each other. Is omitted.)

Subsequently, if the driver presses the accelerator pedal for starting while the ignition is turned on and the output value of the wheel speed sensor is 0, a signal is input from the accelerator pedal position sensor, and the electronic control unit 13 which detects this is again in the parking state. When it is determined that the vehicle is to be started, the motor 2 is rotated in reverse to reverse the lead screw 5 so that the vehicle can be started by releasing the parking brake by the correct position (a reference position where neither the main brake nor the parking brake is operated).

In addition, if the brake switch is turned on while the vehicle is running but it is determined that the vehicle speed is not decelerated by the measured value from the wheel speed sensor, it is determined that the main brake system is in an emergency situation and the motor brake is rotated forward as described above. By pulling the cable 9, the emergency braking action by the parking brake can be achieved.

As such, the present invention allows the parking brake to operate normally in all situations where the parking brake is required to operate.

Here, regardless of the measured values from the brake switch and the wheel speed sensor, a separate manual operation switch is installed in the driver's operating range so that the driver operates the motor 2 by directly operating the manual operation switch in case of danger. Emergency braking can also be achieved.

On the other hand, when the on signal is input from the brake switch during driving and the output value of the wheel speed sensor becomes 0, the electronic control unit 13 determines that the motor is temporarily stopped and then rotates the motor 2 in reverse to produce the final driven gear ( The lead screw 5 is reversed by 4). As such, when the lead screw 5 is reversed, the brake pedal 12 is pulled by pulling the main brake cable 10 to operate the main brake.

That is, the main brake is operated instead of operating the parking brake conventionally when temporarily stopping while driving.

Subsequently, when the driver presses the accelerator pedal to start while the output value of the wheel speed sensor is 0, a signal is input from the accelerator pedal position sensor, and the electronic control unit 13 which detects this attempts to start again from the pause state. By judging that the motor 2 is rotated forward, the lead screw 5 is advanced and positioned to release the main brake so that the vehicle can be started.

On the other hand, when the place is determined to be a hill road by the signal input from the inclination angle sensor when starting after the temporary stop as described above, the engine rotation speed (engine speed sensor) generates driving force such that the driver does not push the accelerator pedal and the vehicle is not pushed. The motor 2 is rotated forward to release the main brake to prevent vehicle rolling at the start of the hillside.

For this operation, the electronic control unit 13 is mapped with an appropriate starting engine speed value according to the slope of the hill.

As described above, in the present invention, the parking brake does not operate at the time of stopping and restarting related to the driving feeling, and the main brake is operated.

However, since the main brake generates a braking force by using the hydraulic pressure of the master cylinder, a large force is not required for the operation, so that the motor 2 operates faster than the conventional braking by operating the parking brake cable.

Therefore, the braking action and the release speed are instantaneously, such as automatic operation when stopping and automatic release upon restarting, so that smooth driving can be performed, whereby the driver feels a smooth driving feeling.

On the other hand, in the past, only the parking brake is operated so that the amount of wear of the brake pads on the rear wheel is excessive, but according to the present invention, the main brake is operated in some cases instead of the parking brake, so that the braking action does not occur only on the two wheels of the rear wheel. Braking action occurs on all four wheels after /, thus sharing the load, which reduces the overall wear of the brake pads and prevents excessive wear of the rear wheel brake pads.

In addition, the problem of rapid operability and excessive wear of the rear brake pads is solved as described above, thereby eliminating the need to use a large capacity motor, thereby solving the problem of increasing vehicle weight and power consumption, as well as saving costs. It has the advantage of being.

As described above, according to the present invention, the main brake is automatically activated and released when the vehicle is stopped and subsequently restarted, so that the operation is convenient and the function is performed more quickly and smoothly.

In addition, when parking, the parking brake is activated to effectively implement various functions as a whole.

In addition, since all four wheel brakes operate, stability during braking is improved, and there is no need to increase the capacity of the motor, thereby preventing weight increase and saving costs, and reducing the amount of wear of the brake pads.

Claims (8)

A motor assembly comprising a motor 2 and a reduction gear box 3 connected to an output shaft of the motor 2 and mounted on the housing 1; A final driven gear 4 having a female thread processed at its center as a final output gear of the reduction gear box 3; It is connected to the female screw of the final driven gear (4), the connecting rod (5a, 5b) is integrally formed in the front and rear portions, respectively, the main connecting rod (5a) is connected to the brake pedal 12 A brake cable 10 is connected and an equalizer 7 of the parking brake cable 9 is connected to the connecting rod 5b at the rear thereof, and the lead screw 5 is moved forward and backward without rotation; When the vehicle is parked or emergency braking is required by receiving signals from the ignition switch, wheel speed sensor, brake switch, accelerator pedal position sensor, inclination angle sensor and engine speed sensor for judging the state of the vehicle, When starting again after the stop, the electric automatic brake device for a vehicle comprising an electronic control unit (13) for operating the parking brake or the main brake by controlling the operation of the motor (2) according to the departure from the hill road. According to claim 1, wherein the front connecting rod (5a) is inserted into the cylindrical cylinder-shaped connector (10a) fixed to the rear end of the main brake cable 10, the stopper (5c) is formed at its end, the connector An inlet of the stopper (10c) is formed with a stopper to hang the stopper (5c), the motorized automatic brake device of the vehicle, characterized in that the spring (14a) is provided between the stopper (5c) and the stopper. The front end of the main brake cable 10 is inserted through the side of the dash panel 11 side of the brake pedal 12 to the interior, and the cylindrical connector 10b is fixed to the end of the brake pedal 12 to brake the brake. Electric brake device of the vehicle, characterized in that the main brake cable 10 is connected to the pedal (12). 2. The equalizer (7) according to claim 1, wherein the equalizer (7) has circular protrusions (6a) formed on both sides of the rectangular parallelepiped, which are inserted into the coupling holes formed in the equalizer (7), and the circular holes (6b) are formed in the front-rear direction. The connecting member 6 is inserted and mounted, and the rear connecting rod 5b of the lead screw 5 is inserted through the hole 6b of the connecting member 6, and a stopper is provided at the rear end of the connecting rod 5b. 5d is integrally fixed so that the rear connecting rod 5b is connected to the parking brake cable 9 through the equalizer 7, while the spring between the stopper 5d and the connecting member 6 14b) is provided with a motorized automatic brake device for a vehicle. According to claim 1, wherein the electronic control unit 13 determines that the driver intends to park the vehicle when the ignition switch is turned off while the brake switch is on and the wheel speed sensor output value is 0, and the brake switch is turned on while the vehicle is being driven. If it is determined that the vehicle speed is not decelerated by the measured value from the wheel speed sensor, it is determined that the main brake system has failed and in these cases, the motor 2 is rotated forward to pull the parking brake cable 9. If the ignition switch is turned on and the acceleration signal is input from the accelerator pedal position sensor while the output value of the wheel speed sensor is 0, it is determined that the vehicle is to start again from the parking state and the motor 2 is reversed. Rotate the lead screw (5) to the reverse position to release the parking brake so that the vehicle can be started. Of electric cars automatic brake system which comprises. 2. The electronic control unit (13) according to claim 1, wherein when the on signal is input from the brake switch and the output value of the wheel speed sensor becomes 0, the electronic control unit (13) determines that the motor is temporarily stopped and rotates the motor (2) in reverse. After inputting the signal from the accelerator pedal position sensor while the output value of the wheel speed sensor is 0, it is determined that the motor is to be restarted from the pause state, and the lead screw 5 is moved forward. By releasing the main brake to enable the vehicle to start. The engine speed according to claim 6, wherein the electronic control unit 13 generates a driving force such that the driver does not push on the hill by pressing the accelerator pedal when a signal indicating that the hill is a path from the inclination angle sensor is input in the case of starting after a pause. When the motor 2 is rotated forward to release the main brake, the electric automatic brake device for a vehicle, characterized in that to prevent the vehicle from rolling on the hillside departure. 2. The lead screw (5) according to claim 1, wherein the lead screw (5) has a slider (5e) which is integrally formed in a rectangular shape at the front end and slides back and forth in an unrotable state in the guide (1c) formed integrally with the housing (1). Motorized automatic brake device characterized in that.

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